CN116872695A

CN116872695A - Twelve-channel integrated valve-based thermal management system and method

Info

Publication number: CN116872695A
Application number: CN202311024551.7A
Authority: CN
Inventors: 程宇云; 谢奕; 王文星; 李飞虎; 何凯
Original assignee: Litens Automotive Suzhou Co ltd
Current assignee: Litens Automotive Suzhou Co ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2023-10-13

Abstract

The invention provides a heat management system and a method based on a twelve-channel integrated valve, wherein the heat management system comprises a refrigerant loop and a cooling liquid loop, the refrigerant loop comprises a heat exchanger 1#, a heat exchanger 2#, a heat exchanger 3#, a compressor, an evaporator, a first expansion valve, a second expansion valve and a three-way valve, and the cooling liquid loop comprises the twelve-channel integrated valve, the heat exchanger 1#, the heat exchanger 2#, a heater, an external radiator, a motor electric control system, an internal radiator and a power battery. According to the invention, the existing refrigerant and cooling liquid are used as carriers, twelve-channel integrated valves capable of meeting the thermal management requirements under different working conditions are added on the waterway side, and the twelve-channel integrated valves are adopted to organically combine the fineness of energy control with the complexity of pipelines, so that the energy control can be accurately controlled according to the actual temperatures of different components, and the situation that too many control units and redundant pipelines exist in the cooling liquid measurement can be avoided.

Description

Twelve-channel integrated valve-based thermal management system and method

Technical Field

The invention relates to the technical field of automobile thermal management, in particular to a thermal management system and method based on a twelve-channel integrated valve.

Background

The modern automotive industry is rapidly developing, and in recent years, pure electric and hybrid vehicles have a tendency to gradually become the main stream of the market. New energy technology vehicles (including all-electric and hybrid vehicles) have become a new choice for people to travel because of their technological appearance, extremely low energy costs and environmental value. The thermal management technology is based on the requirements of the new energy vehicle, and because the new energy vehicle has the problems of mileage anxiety, thermal runaway and the like, the reasonable distribution and efficient utilization of energy in the whole vehicle system are very important, and the support of the thermal management technology is needed. The thermal management system in the prior art has the problems of contradiction between the fineness of energy control and the complexity of pipelines. Accordingly, there is a need to provide a thermal management system and a thermal management method that meets the above-described needs.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: in order to overcome the defects in the prior art, the invention provides a twelve-channel integrated valve-based thermal management system and a twelve-channel integrated valve-based thermal management method.

The technical scheme adopted for solving the technical problems is as follows: the heat management system based on the twelve-channel integrated valve comprises a refrigerant loop and a cooling liquid loop, wherein the refrigerant loop comprises a heat exchanger 1#, a heat exchanger 2#, a heat exchanger 3#, a compressor, an evaporator, a first expansion valve, a second expansion valve and a three-way valve, the cooling liquid loop comprises the twelve-channel integrated valve, the heat exchanger 1#, the heat exchanger 2#, a heater, an external radiator, a motor/electric control, an internal radiator and a power battery,

In the refrigerant loop, a heat exchanger 1#, a compressor, a heat exchanger 2#, and a heat exchanger 3# are sequentially connected in series through pipelines to form a loop, the refrigerant pipes of the heat exchanger 1# and the heat exchanger 2# are connected into the refrigerant loop, a second expansion valve is arranged on the pipeline of the inlet end of the refrigerant pipe of the heat exchanger 1#, the evaporator is connected in parallel with two ends of the refrigerant pipe of the heat exchanger 1# through the pipeline, a first expansion valve is arranged on the pipeline of the inlet end of the evaporator, a three-way valve is arranged on the pipeline between the heat exchanger 2# and the heat exchanger 3#, one port of the three-way valve is connected with the outlet end of the refrigerant pipe of the heat exchanger 2#, the second port of the three-way valve is connected with the inlet end of the heat exchanger 3# through the pipeline through a first stop valve, and the third port of the three-way valve is connected to the pipeline of the outlet end of the heat exchanger 3# through a second stop valve to form a bypass pipeline connected with the heat exchanger 3#;

in the cooling circuit, the twelve-channel integrated valve is provided with 12 ports, namely P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11 and P12, wherein the port P7 is connected to the inlet end of a cooling liquid pipe of the heat exchanger 1# through a pipeline, and the outlet end of the cooling liquid pipe of the heat exchanger 1# is connected to the port P2 through a pipeline; the port P8 is connected to the inlet end of the cooling liquid pipe of the heat exchanger 2# through a first water pump, and the outlet end of the cooling liquid pipe of the heat exchanger 2# is connected to the port P3 through a heater through a pipeline; the port P6 is connected to the inlet end of a cooling liquid pipe of the external radiator through a pipeline, and the outlet end of the cooling liquid pipe of the external radiator is connected to the port P1 through a pipeline; the port P9 is connected to the inlet end of a cooling liquid pipe of the power battery through a second water pump by a pipeline, and the outlet end of the cooling liquid pipe of the power battery is connected to the port P4 by a pipeline; the port P10 is connected to the inlet end of a cooling liquid pipe of the motor electric control system through a third water pump by a pipeline, and the outlet end of the cooling liquid pipe of the motor electric control system is connected to the port P5 by a pipeline; the port P12 is connected to the coolant pipe inlet end of the radiator in the vehicle by a pipe, and the coolant pipe outlet end of the radiator in the vehicle is connected to the port P11 by a pipe.

The thermal management system has one or more functional modes according to different scenes, and the following eight functional modes are provided for illustrating the operation conditions of the different functional modes.

Functional mode one: the functional mode is suitable for a conventional scene in summer. Since the coolant circuit of heat exchanger # 2 is not operated, heat exchanger # 2 corresponds to a general pipe. In the refrigerant loop, the external heat exchanger 3# plays a role of a condenser, and forms an air conditioning system together with the first expansion valve, the internal evaporator and the compressor, and cooling and refrigerating are carried out on the passenger cabin through convection of the internal evaporator. In the cooling liquid loop, the temperature of the power battery is proper, and the same temperature as the environment is kept through the self-circulation of the cooling liquid. The motor electric control system is communicated with the external radiator through switching of the integrated valve, and the electronic control module is subjected to liquid cooling through the external radiator (LTR cooling).

Functional mode two: this functional mode is suitable for hot summer scenarios, for example outdoor temperatures exceeding 32 ℃, and the power battery cannot be satisfied within a proper temperature range by means of the self-circulation of the cooling liquid alone. The second expansion valve is opened on the basis of the first expansion valve, so that the heat exchanger 1# plays a role of an evaporator, heat in a cooling liquid loop is absorbed through the heat exchanger 1# and meanwhile, the heat exchanger 1# is connected with the power battery through the twelve-channel integrated valve, and therefore the heat of the power battery can be brought to the heat exchanger 1# through the cooling liquid loop and released, and the heat dissipation of the power battery is enhanced; the heat exchanger 3# also plays a role in condensation.

Functional mode three: the functional mode is also suitable for a conventional scene in summer, most of the systems of the functional mode III and the functional mode I are the same, only twelve-channel integrated valve connectors are switched, and the radiator outside the vehicle is connected with a power battery instead of a motor electric control unit. The mode is suitable for the condition that the temperature of the power battery is higher and the temperature of the motor electric control system is not high, and can be flexibly switched according to the actual temperature and the functional mode of the power battery and the motor electric control system.

Functional mode four: the mode is suitable for a conventional winter scene, and the refrigerant loop plays a role of a heat pump air conditioner. The off-vehicle heat exchanger 3# is turned off by the control of the three-way valve, at which time the heat exchanger 2# functions as a condenser, and heat is brought to the coolant circuit by the heat exchanger 2 #. In the cooling liquid loop, the radiator in the vehicle is communicated with the heat exchanger 2#, heat generated by the heat pump is released to the passenger cabin through the radiator in the vehicle, and the heater can also perform supplementary heating according to actual conditions, so that the comfort level of a user is guaranteed preferentially in general. The power battery and the motor electric control system are at proper temperature, and only self-circulation is carried out to keep the current situation.

Functional mode five: the mode is suitable for a conventional winter scene, and is different from the functional mode four in that the second expansion valve is opened, and the heat exchanger 1# plays a role of an evaporator and is connected with a motor electric control system through a twelve-channel integrated valve. The heat generated by the energy loss of the motor electric control system is transferred to the heat exchanger 1# through the cooling liquid and taken away by the cold coal, and the heat enters the compressor along with the refrigerant, so that the inlet temperature of the compressor can be increased, and the system efficiency of the heat pump system is improved. The radiator in the vehicle still receives the heat generated by the heat exchanger 2# and the heater to ensure the comfort level in the passenger cabin. The power battery has no special heating requirement, and can maintain proper temperature through self-circulation.

Functional mode six: the mode is suitable for a conventional winter scene, especially for a situation of starting immediately after long-time parking. In this mode function, the power cell temperature is close to ambient temperature, well below the appropriate temperature of 10-30 ℃. At the moment, the twelve-channel integrated valve is controlled to connect the power battery circuit with the radiator circuit in the vehicle in series on the basis of the function mode five, and heat generated by the heat exchanger 2# and the heater passes through the power battery after passing through the radiator in the vehicle, so that a stronger active heating effect is generated on the power battery, and the temperature of the power battery is quickly raised to a proper level. The preheating of the motor electric control system is still absorbed and utilized by the refrigerant loop through the heat exchanger 1#.

Functional mode seven: the mode is suitable for a conventional winter scene, and is different from the functional mode six in that the second expansion valve is closed, the waste heat recovery of the motor electric control system is canceled, the motor electric control system is connected with the external radiator through controlling the twelve-channel integrated valve, and the mode enters the LTR cooling mode, and is applied to the conditions that the temperature of the motor electric control system is not high and the waste heat recovery is not cost-effective. The heating of the power battery and the passenger compartment is still performed by the heat exchanger 2# and the heater, which is the same as the functional mode six.

Functional mode eight: this mode is applicable to emergency situations in winter scenes. When the system detects that the temperature of the power battery is abnormally increased and quick cooling is needed, the twelve-channel integrated valve immediately connects the power battery with the heat exchanger 1# and opens the second expansion valve, and at the moment, the heat exchanger 1# plays a role of an evaporator to absorb heat in a cooling liquid loop. In this mode, the passenger cabin continues to be provided with heat by the heat exchanger 2# and the heater, the motor electric control system is in the LTR mode, and the vehicle exterior radiator performs heat dissipation and cooling.

It should be noted that, in the above eight functional modes, the conventional scene in summer generally refers to a situation that the ambient temperature is high, for example, the ambient temperature is below 30 ℃; summer hot scenes generally refer to environments with higher temperatures exceeding 30 ℃; winter conventional scenes generally refer to ambient temperatures above zero but below 10 ℃; in winter scenes, the environment temperature is lower than zero, and the environment temperature is colder.

The heat management method based on the twelve-channel integrated valve adopts the heat management system and comprises the following steps:

s1: according to actual conditions, the temperatures of the passenger cabin, the power battery and the motor electric control system are divided, wherein the temperatures of the passenger cabin and the power battery are equally divided into three grades, namely, a proper grade, a low temperature grade and a high temperature grade, and the temperatures of the motor electric control system are divided into two grades, namely, a proper grade and a high temperature grade;

S2: judging which level the temperature of the passenger cabin is in, and directly entering step S3 when the temperature level of the passenger cabin is proper; when the temperature grade of the passenger cabin is high, starting a compressor, starting a heat exchanger 3# outside the vehicle, refrigerating the passenger cabin through an evaporator, and then entering a step S3; when the temperature grade of the passenger cabin is low, starting a compressor, starting a heat exchanger 2# as a condenser, heating the passenger cabin through an in-vehicle radiator, and then entering a step S3;

s3: judging which level the temperature of the power battery is at, when the temperature level of the power battery is proper, performing cooling liquid self-circulation by the power battery, and then entering into step S4; when the temperature grade of the power battery is high, a second expansion valve is opened, the power battery is communicated with the heat exchanger 1#, and then the step S4 is carried out; when the temperature level of the power battery is low, controlling the twelve-channel integrated valve to connect the power battery with the heater in series, heating the power battery, and then entering step S4;

s4: judging which level the temperature of the motor electric control system is at, when the temperature level of the motor electric control system is proper, the motor electric control system carries out cooling liquid self-circulation, then exits, and waits for the next temperature judgment; when the temperature grade of the motor electric control system is high, connecting the motor electric control system with the radiator outside the vehicle, entering the electric drive LTR for cooling, and then exiting the electric drive LTR for waiting for the next temperature judgment.

The beneficial effects of the invention are as follows: according to the twelve-channel integrated valve-based heat management system and method provided by the invention, the conventional refrigerant and cooling liquid are used as carriers, the twelve-channel integrated valve capable of meeting heat management requirements under different working conditions is additionally arranged on the waterway side, the switching of various different functional modes is realized through the switching of the port connection of the twelve-channel integrated valve, the fineness of energy control and the complexity of pipelines are organically combined by adopting the twelve-channel integrated valve, the accurate control can be carried out according to the actual temperatures of different components, and the excessive control units and redundant pipelines in the cooling liquid measurement can be avoided.

Drawings

The invention is further described below with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a twelve-channel integrated valve-based thermal management system of the present invention.

Fig. 2 is a schematic diagram of a functional mode one.

Fig. 3 is a schematic diagram of the functional mode two.

Fig. 4 is a schematic diagram of the functional mode three.

Fig. 5 is a schematic diagram of the functional mode four.

Fig. 6 is a schematic diagram of the functional mode five.

Fig. 7 is a schematic diagram of the functional mode six.

Fig. 8 is a schematic diagram of the functional mode seven.

Fig. 9 is a schematic diagram of the functional mode eight.

FIG. 10 is a flow chart of a method of thermal management based on a twelve-channel integrated valve.

In the figure: 1. twelve-channel integrated valve, 2, compressor, 3, evaporator, 4, heat exchanger 1#,5, heat exchanger 2#,6, heat exchanger 3#,7, external radiator, 8, heater, 9, power battery, 10, motor electric control system, 11, internal radiator, 12, first expansion valve, 13, second expansion valve, 14, first stop valve, 15, three-way valve, 16, second stop valve, 17, first water pump, 18, second water pump, 19, third water pump, 20, bypass pipeline.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only those features which are relevant to the invention, and orientation and reference (e.g., up, down, left, right, etc.) may be used solely to aid in the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

As shown in fig. 1, the twelve-channel integrated valve-based thermal management system comprises a refrigerant loop and a cooling liquid loop, wherein the refrigerant loop comprises a heat exchanger 1#4, a heat exchanger 2#5, a heat exchanger 3#6, a compressor 2, an evaporator 3, a first expansion valve 12, a second expansion valve 13 and a three-way valve 15, the cooling liquid loop comprises a twelve-channel integrated valve 1 (called twelve-way valve for short), the heat exchanger 1#4, the heat exchanger 2#5, a heater 8, an off-vehicle radiator 7, a motor/electric control, an on-vehicle radiator 11 and a power battery 9, in the refrigerant loop, the heat exchanger 1#4, the compressor 2, the heat exchanger 2#5 and the heat exchanger 3#6 are sequentially connected in series through pipelines to form a loop, the pipeline of the heat exchanger 1#4 and the heat exchanger 2#5 is connected with the refrigerant loop, the pipeline of the refrigerant pipeline of the inlet end of the heat exchanger 1#4 is provided with the second expansion valve 13, the evaporator 3 is connected with the two ends of the heat exchanger 1#4 through the pipeline, the evaporator 3 is provided with the pipeline of the heat exchanger 3#4, the pipeline of the three-way valve is connected with the three-way valve 15 through the heat exchanger 3#6 through the pipeline of the three-way valve 15, and the pipeline of the heat exchanger 3#6 is connected with the three-way valve 15 through the pipeline of the heat exchanger 3#6 to the three-way valve 15 through the inlet end of the heat exchanger 3#6; in the cooling circuit, the twelve-channel integrated valve 1 has 12 ports, namely P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11 and P12, wherein the port P7 is connected to the inlet end of the cooling liquid pipe of the heat exchanger 1#4 through a pipeline, and the outlet end of the cooling liquid pipe of the heat exchanger 1#4 is connected to the port P2 through a pipeline; the port P8 is connected to the inlet end of the cooling liquid pipe of the heat exchanger 2#5 through a first water pump 17, and the outlet end of the cooling liquid pipe of the heat exchanger 2#5 is connected to the port P3 through a heater 8 through a pipeline; the port P6 is connected to the inlet end of the cooling liquid pipe of the external radiator 7 through a pipeline, and the outlet end of the cooling liquid pipe of the external radiator 7 is connected to the port P1 through a pipeline; the port P9 is connected to the inlet end of the cooling liquid pipe of the power battery 9 through a second water pump 18 by a pipeline, and the outlet end of the cooling liquid pipe of the power battery 9 is connected to the port P4 by a pipeline; the port P10 is connected to the inlet end of the cooling liquid pipe of the motor electric control system 10 through a third water pump 19 by a pipeline, and the outlet end of the cooling liquid pipe of the motor electric control system 10 is connected to the port P5 by a pipeline; the port P12 is connected to the coolant pipe inlet end of the radiator 11 in the vehicle by a pipe, and the coolant pipe outlet end of the radiator 11 in the vehicle is connected to the port P11 by a pipe.

For simplicity of illustration, the system includes non-core components not shown in the figures, such as an expansion kettle, a temperature/pressure sensor, a drying tank, an energy storage tank, and the like. The broken line in the figure is a refrigerant loop, and the refrigerant can adopt hydrocarbon or hydrocarbon fluorine mediums; the solid line is a liquid working fluid circuit, i.e. a coolant circuit, the coolant is preferably water, and therefore may also be referred to as a water circuit. In the figure, "x" indicates that the pipe is not open, and the refrigerant or the coolant in the pipe does not participate in the circulation. The arrows in the figure indicate the flow direction of the coolant or the coolant in the pipe when the pipe is connected.

The thermal management system based on the twelve-channel integrated valve 1 of the present invention has a plurality of functional modes including, but not limited to, the following eight functional modes, which are described in detail in the present embodiment.

As shown in fig. 2, functional mode one: the functional mode is suitable for a conventional summer scene, and the functional mode one comprises passenger cabin refrigeration, battery self-circulation cooling and electric LTR cooling. In the first functional mode, the connection relationship between the internal ports of the twelve-channel integrated valve 1 is: the port P2 is communicated with the port P7, the port P3 is communicated with the port P8, the port P4 is communicated with the port P9, the port P11 is communicated with the port P12, the port P5 is communicated with the port P6 and the port P1 is communicated with the port P10; and the heat exchanger 1#4, the heat exchanger 2#5, the heater 8, the radiator 11 in the vehicle and the first water pump 17 do not work, the first stop valve 14 is opened, the second stop valve 16 is closed, the first expansion valve 12 is opened, the second expansion valve 13 is closed, and other parts work normally.

Refrigerating the passenger cabin: in the refrigerant loop, the heat exchanger 2#5 does not work, a refrigerant pipe of the heat exchanger 2#5 is used as a common pipeline, the heat exchanger 3#6, the first expansion valve 12, the evaporator 3 and the compressor 2 jointly form an air-conditioning refrigerating system, the refrigerant circulates in a pipeline of the air-conditioning refrigerating system, and the refrigerant absorbs heat through the evaporator 3 to cool the passenger cabin.

Self-circulation cooling of the battery: in the coolant loop, the temperature of the power battery 9 is relatively suitable because the ambient temperature is not high, and the second water pump 18 works to circulate the coolant in the coolant pipe of the power battery 9.

Electric LTR cooling: in the cooling liquid loop, through the switching of the ports of the twelve-channel integrated valve 1, a cooling liquid pipe of the motor electric control system 10 is communicated with the external radiator 7, the third water pump 19 works, so that cooling liquid in the cooling liquid pipe circulates, and the cooling liquid cools an electronic control module of the motor electric control system 10 through the external radiator 7, namely LTR.

As shown in fig. 3, functional mode two: the functional mode is used for a hot scene in summer, and the two functional modes comprise passenger cabin refrigeration, battery liquid cooling and electric LTR cooling. In the second functional mode, the connection relationship between the internal ports of the twelve-channel integrated valve 1 is: the port P2 is communicated with the port P9, the port P3 is communicated with the port P8, the port P4 is communicated with the port P7, the port P11 is communicated with the port P12, the port P5 is communicated with the port P6 and the port P1 is communicated with the port P10; and the heat exchanger 2# 5, the heater 8, the in-vehicle radiator 11 and the first water pump 17 do not work, the first stop valve 14 is opened, the second stop valve 16 is closed, the first expansion valve 12 and the second expansion valve 13 are opened, and other parts work normally.

Refrigerating the passenger cabin: in the refrigerant loop, the heat exchanger 2#5 does not work, a refrigerant pipe of the heat exchanger 2#5 is used as a common pipeline, the heat exchanger 3#6, the first expansion valve 12, the evaporator 3 and the compressor 2 jointly form an air conditioning refrigerating system, the refrigerant circulates in the pipeline of the air conditioning refrigerating system, and the refrigerant absorbs heat through the evaporator 3 to cool the passenger cabin.

Liquid cooling and cooling of the battery: in hot summer scenarios, e.g. outdoor temperatures exceeding 32 ℃, the power battery 9 is not within a suitable temperature range by means of cooling fluid self-circulation alone. The heat exchanger 1# 4 works, and heat exchange can be carried out between a refrigerant pipe and a cooling liquid pipe of the heat exchanger 1# 4; through the switching of twelve-channel integrated valve 1 ports, the cooling liquid pipe of the power battery 9 is communicated with the cooling liquid pipe of the heat exchanger 1#4, the cooling liquid in the cooling liquid pipe of the power battery 9 absorbs heat generated by the power battery 9 and surrounding environment, the heat is brought to the cooling liquid pipe of the heat exchanger 1#4, the cooling liquid in the cooling liquid pipe of the heat exchanger 1#4 absorbs heat brought back by the cooling liquid, and the cooling liquid in the cooling liquid pipe of the heat exchanger 1#4 releases heat after passing through the compressor 2 and the heat exchanger 3#6, so that the temperature of the cooling liquid is reduced, and a battery liquid cooling cycle is formed.

Electric LTR cooling: the cooling process and the connection manner of the electrically driven LTR in the second functional mode are identical to those in the first functional mode, and thus, the details are not repeated here.

As shown in fig. 4, a third functional mode, which is suitable for a conventional summer scene, includes passenger compartment cooling, battery LTR cooling, and electric drive self-circulation, and in the third functional mode, the connection relationship between the internal ports of the twelve-channel integrated valve 1 is: ports P2 and P7 are communicated, ports P3 and P12 are communicated and ports P8 and P11 are communicated, ports P4 and P6 are communicated and ports P1 and P9 are communicated, and ports P5 and P10 are communicated; and the heat exchanger 1#4, the heat exchanger 2#5, the heater 8, the radiator 11 in the vehicle and the first water pump 17 do not work, the first stop valve 14 is opened, the second stop valve 16 is closed, the first expansion valve 12 is opened, the second expansion valve 13 is closed, and other parts work normally.

Refrigerating the passenger cabin: the process and connection manner of the passenger cabin refrigeration in the third functional mode are identical to those in the first functional mode, and therefore, the description thereof is omitted.

Battery LTR cooling: in the cooling liquid loop, a cooling liquid pipe of the power battery 9 is communicated with the external radiator 7 through switching of ports of the twelve-channel integrated valve 1, and the second water pump 18 works to enable cooling liquid in the cooling liquid pipe to circulate, and the power battery 9 is cooled through the external radiator 7.

Self-circulation of electric drive: in the coolant loop, because the ambient temperature is suitable, the motor electric control system 10 performs cooling and heat dissipation in a coolant self-circulation mode, and the third water pump 19 works to circulate the coolant in the coolant pipe of the motor electric control system 10, so that the electronic control module of the motor electric control system 10 keeps the same temperature as the environment through the self-circulation of the coolant in the coolant pipe.

As shown in fig. 5, a functional mode four, which is suitable for a winter conventional scenario, includes heat pump heating, battery self-circulation and electric drive self-circulation, and in the functional mode four, the connection relationship between the internal ports of the twelve-channel integrated valve 1 is: the port P2 is communicated with the port P7, the port P3 is communicated with the port P12, the port P8 is communicated with the port P11, the port P4 is communicated with the port P9, the port P1 is communicated with the port P6, and the port P5 is communicated with the port P10; the heat exchanger 1#4, the heat exchanger 3#6 and the external radiator 7 do not work, the first stop valve 14 is closed, the second stop valve 16 is opened, and the bypass pipeline 20 of the heat exchanger 3#6 is connected into the system; the first expansion valve 12 is opened, the second expansion valve 13 is closed, and other components work normally.

And (3) heating by a heat pump: in a refrigerant loop, a heat exchanger 2#5 works normally, a heat pump air conditioning system is formed by the heat exchanger 2#5, a bypass pipeline 20, a first expansion valve 12, an evaporator 3 and a compressor 2, the refrigerant in the evaporator 3 absorbs heat of the external environment, the refrigerant carries the heat to circulate in a pipeline of the heat pump air conditioning system, and the heat is brought into a cooling liquid loop through the heat exchanger 2#5; in the cooling liquid loop, through the switching of the ports of the twelve-channel integrated valve 1, the in-vehicle radiator 11 is communicated with the cooling liquid pipe of the heat exchanger 2#5, the first water pump 17 works, so that the cooling liquid circulates in the loop formed by the in-vehicle radiator 11, the cooling liquid pipe of the heat exchanger 2#5 and the heater 8, and heat generated by the heat pump air conditioning system is released to the passenger cabin through the in-vehicle radiator 11, wherein the heater 8 carries out supplementary heating according to actual conditions.

Self-circulation of the battery: in the cooling liquid loop, through the switching of the ports of the twelve-channel integrated valve 1, the ports P4 and P9 are communicated internally, so that the two ends of the cooling liquid pipe of the power battery 9 are communicated, the second water pump 18 works, and the temperature of the power battery 9 is kept through the self-circulation of cooling liquid in the cooling liquid pipe of the power battery 9.

Self-circulation of electric drive: in the cooling liquid loop, through the switching of the ports of the twelve-channel integrated valve 1, the ports P5 and P10 are internally communicated, so that the two ends of a cooling liquid pipe of the motor electric control system 10 are communicated, the third water pump 19 works, and the temperature of an electronic control module of the motor/electric control system is kept through the self-circulation of cooling liquid in the cooling liquid pipe of the motor/electric control system.

As shown in fig. 6, the function mode five, which is applicable to the function mode five of the conventional scene in winter, includes heat pump heating, battery self-circulation and motor waste heat recovery. In the function mode five, the connection relationship between the internal ports of the twelve-channel integrated valve 1 is: the port P2 is communicated with the port P10, the port P5 is communicated with the port P7, the port P3 is communicated with the port P12, the port P8 is communicated with the port P11, the port P4 is communicated with the port P9, and the port P1 is communicated with the port P6; the heat exchanger 3#6 and the external radiator 7 do not work, the first stop valve 14 is closed, and the second stop valve 16 is opened, so that the bypass pipeline 20 of the heat exchanger 3#6 is connected into the system; the first expansion valve 12 and the second expansion valve 13 are both opened, and the other components work normally.

And (3) heating by a heat pump: in the refrigerant loop, a second expansion valve 13 is opened, a heat exchanger 1#4 is connected into the system, the heat exchanger 1#4 and the heat exchanger 2#5 work normally, a heat pump air conditioning system is formed by the heat exchanger 1#4, the heat exchanger 2#5, a bypass pipeline 20, a first expansion valve 12, a second expansion valve 13, an evaporator 3 and a compressor 2 together, the heat of the external environment is absorbed by the refrigerant in the evaporator 3, the heat generated by a motor electric control system 10 transferred by cooling liquid and absorbed by the refrigerant in the heat exchanger 1#4 is carried by the refrigerant to circulate in a pipeline of the heat pump air conditioning system, and the heat is brought into the cooling liquid loop by the heat exchanger 2#5; in the cooling liquid loop, through the switching of the ports of the twelve-channel integrated valve 1, the in-vehicle radiator 11 is communicated with the cooling liquid pipe of the heat exchanger 2#5, the first water pump 17 works, so that cooling liquid circulates in the loop formed by the in-vehicle radiator 11, the cooling liquid pipe of the heat exchanger 2#5 and the heater 8, heat generated by the heat pump air conditioning system and heat generated by the recovered motor electric control system 10 are released to the passenger cabin through the in-vehicle radiator 11, and the heater 8 is used for carrying out supplementary heating according to actual conditions.

Self-circulation of the battery: the self-circulation process and connection mode of the battery in the function mode five are identical to those in the function mode four, so that the description is omitted here.

And (3) recovering waste heat of a motor: in the cooling liquid loop, through switching of the ports of the twelve-channel integrated valve 1, the ports P2 and P10 are communicated, and the ports P5 and P7 are communicated, so that two ends of a cooling liquid pipe of the motor electric control system 10 are communicated with two ends of a cooling liquid pipe of the heat exchanger 1#4, heat generated by energy loss of the motor electric control system 10 is absorbed by cooling liquid in the cooling liquid pipe, heat in the cooling liquid is transferred to a refrigerant through the heat exchanger 1#4, and the heat is recycled along with the refrigerant entering the heat pump air conditioning system.

As shown in fig. 7, a functional mode six, which is suitable for a winter general scenario, includes heat pump heating, battery heating, and motor waste heat recovery, and in the functional mode six, the connection relationship between the internal ports of the twelve-channel integrated valve 1 is: the port P2 is communicated with the port P10, the port P5 is communicated with the port P7, the port P3 is communicated with the port P12, the port P4 is communicated with the port P8, the port P9 is communicated with the port P11, and the port P1 is communicated with the port P6; the heat exchanger 3#6 and the external radiator 7 do not work, the first stop valve 14 is closed, and the second stop valve 16 is opened, so that the bypass pipeline 20 of the heat exchanger 3#6 is connected into the system; the first expansion valve 12 and the second expansion valve 13 are both opened, and the other components work normally.

Heat pump heating and battery heating: in the refrigerant loop, a second expansion valve 13 is opened, a heat exchanger 1#4 is connected into the system, the heat exchanger 1#4 and the heat exchanger 2#5 work normally, a heat pump air conditioning system is formed by the heat exchanger 1#4, the heat exchanger 2#5, a bypass pipeline 20, a first expansion valve 12, a second expansion valve 13, an evaporator 3 and a compressor 2 together, the heat of the external environment is absorbed by the refrigerant in the evaporator 3, the heat generated by a motor electric control system 10 transferred by cooling liquid and absorbed by the refrigerant in the heat exchanger 1#4 is carried by the refrigerant to circulate in a pipeline of the heat pump air conditioning system, and the heat is brought into the cooling liquid loop by the heat exchanger 2#5; in the cooling liquid loop, through switching of the ports of the twelve-channel integrated valve 1, the cooling liquid pipes of the radiator 11, the heat exchanger 2#5 and the power battery 9 in the vehicle are sequentially connected in series, the first water pump 17 and the second water pump 18 work simultaneously, so that the cooling liquid circulates in the loop formed by the cooling liquid pipes of the radiator 11, the heat exchanger 2#5, the heater 8 and the cooling liquid pipe of the power battery 9, heat generated by the heat pump air conditioning system and heat generated by the recovered motor electric control system 10 are released to the passenger cabin through the radiator 11 in the vehicle, and meanwhile, the power battery 9 is heated through the cooling liquid in the cooling liquid pipe of the power battery 9, wherein the heater 8 carries out supplementary heating according to actual conditions.

And (3) recovering waste heat of a motor: the process and the connection mode of the motor waste heat recovery in the functional mode six are completely the same as those in the functional mode five, so that the description is omitted here.

As shown in fig. 8, a functional mode seven, which is suitable for a winter general scene, includes heat pump heating, battery heating, and electric drive LTR cooling, and in which the connection relationship between the internal ports of the twelve-channel integrated valve 1 is: ports P2 and P7 are communicated, ports P5 and P6 are communicated, ports P1 and P10 are communicated, ports P3 and P12 are communicated, ports P4 and P8 are communicated, and ports P9 and P11 are communicated; the heat exchanger 1# 4 and the heat exchanger 3# 6 do not work, the first stop valve 14 is closed, the second stop valve 16 is opened, and the bypass pipeline 20 of the heat exchanger 3# 6 is connected into the system; the first expansion valve 12 is opened to enable the evaporator 3 to be connected into the system; the second expansion valve 13 is closed to enable the heat exchanger 1# 4 not to be connected into the system, and other parts work normally.

Heat pump heating and battery heating: in a refrigerant loop, a heat exchanger 2#5 works normally, a heat pump air conditioning system is formed by the heat exchanger 2#5, a bypass pipeline 20, a first expansion valve 12, an evaporator 3 and a compressor 2, the refrigerant in the evaporator 3 absorbs heat of the external environment, the refrigerant carries the heat to circulate in a pipeline of the heat pump air conditioning system, and the heat is carried into a cooling liquid loop through the heat exchanger 2#5; in the cooling liquid loop, through the switching of the ports of the twelve-channel integrated valve 1, the cooling liquid pipes of the radiator 11, the heat exchanger 2#5 and the power battery 9 in the vehicle are sequentially connected in series, the first water pump 17 and the second water pump 18 work simultaneously, so that the cooling liquid circulates in the loop formed by the cooling liquid pipes of the radiator 11, the heat exchanger 2#5, the heater 8 and the cooling liquid pipe of the power battery 9, heat generated by the heat pump air conditioning system is released to the passenger cabin through the radiator 11 in the vehicle, and meanwhile, the power battery 9 is heated through the cooling liquid in the cooling liquid pipe of the power battery 9, wherein the heater 8 carries out supplementary heating according to actual conditions.

Electric LTR cooling: in the cooling liquid loop, a cooling liquid pipe of the motor electric control system 10 is communicated with the external radiator 7 through switching of ports of the twelve-channel integrated valve 1, the third water pump 19 works, so that cooling liquid in the cooling liquid pipe circulates, and the electronic control module of the motor electric control system 10 is subjected to liquid cooling through the external radiator 7.

As shown in fig. 9, functional mode eight: the functional mode is suitable for emergency situations in winter scenes, the functional mode eight comprises heat pump heating, battery cooling and electric drive LTR cooling, and in the functional mode eight, the connection relation between the internal ports of the twelve-channel integrated valve 1 is as follows: ports P2 and P9 communicate and ports P4 and P7 communicate, ports P5 and P6 communicate and ports P1 and P10 communicate, ports P3 and P12 communicate and ports P8 and P11 communicate; only the heat exchanger 3#6 does not work, the first stop valve 14 is closed, the second stop valve 16 is opened, and the bypass pipeline 20 of the heat exchanger 3#6 is connected into the system; the first expansion valve 12 and the second expansion valve 13 are both opened, so that the evaporator 3 and the heat exchanger 1#4 are connected into the system, and other components work normally.

And (3) heating by a heat pump: in a refrigerant loop, a heat exchanger 2#5 works normally, a heat pump air conditioning system is formed by the heat exchanger 2#5, a bypass pipeline 20, a first expansion valve 12, an evaporator 3 and a compressor 2, the refrigerant in the evaporator 3 absorbs heat of the external environment, the refrigerant carries the heat to circulate in a pipeline of the heat pump air conditioning system, and the heat is brought into a cooling liquid loop through the heat exchanger 2#5; in a cooling liquid loop, through switching of ports of a twelve-channel integrated valve 1, the in-vehicle radiator 11 is communicated with a cooling liquid pipe of a heat exchanger 2#5, a first water pump 17 works, so that cooling liquid circulates in a loop formed by the in-vehicle radiator 11, the cooling liquid pipe of the heat exchanger 2#5 and a heater 8, and heat generated by a heat pump air conditioning system is released to a passenger cabin through the in-vehicle radiator 11, wherein the heater 8 carries out supplementary heating according to actual conditions; meanwhile, the second expansion valve 13 is opened, the heat exchanger 1#4 works normally, and the refrigerant in the refrigerant pipe of the heat exchanger 1#4 absorbs heat generated by the power battery 9 recovered by the cooling liquid in the cooling liquid pipe and carries the heat to enter the heat pump air conditioning system.

And (3) cooling the battery: in the cooling liquid loop, through the switching of the ports of the twelve-channel integrated valve 1, a cooling liquid pipe of the power battery 9 is communicated with a cooling liquid pipe of the heat exchanger 1#4, the cooling liquid in the cooling liquid pipe of the power battery 9 absorbs heat generated by the power battery 9 and brings the heat to the cooling liquid pipe of the heat exchanger 1#4, the cooling liquid in the cooling liquid pipe of the heat exchanger 1#4 absorbs the heat recovered by the cooling liquid, and the cooling liquid in the cooling liquid pipe of the heat exchanger 1#4 enters a heat pump air conditioning system through the compressor 2 and the heat exchanger 2#5.

In the cooling liquid loop, through switching of the ports of the twelve-channel integrated valve 1, a cooling liquid pipe of the motor electric control system 10 is communicated with the external radiator 7, and the third water pump 19 works to enable cooling liquid in the cooling liquid pipe to circulate, and the electronic control module of the motor electric control system 10 is subjected to liquid cooling through the external radiator 7.

Twelve-way valve system thermal management enforcement strategy: the heat management method based on the twelve-channel integrated valve 1 adopts the heat management system and comprises the following steps:

s1: according to actual conditions, the temperatures of the passenger cabin, the power battery 9 and the motor electric control system 10 are divided into three grades, namely proper, high-temperature and low-temperature, respectively denoted by A1, B1 and C1; the temperature of the power battery 9 is divided into three grades of proper, high temperature and low temperature, which are respectively represented by A2, B2 and C2; because the motor electric control system 10 generally has cold starting capability, the motor electric control system 10 does not need to be heated under the low-temperature working condition, and therefore, the temperature of the motor electric control system 10 is divided into two grades, namely proper and high temperature, respectively using A3 and B3; the temperature division and the corresponding grades are shown in table 1.

Under different working conditions, the system judges according to the temperatures of the passenger cabin, the power battery 9 and the motor electric control system 10, determines the working mode required to be loaded and controls the twelve-way heat management integrated valve and the three-way valve 15 to switch modes. Simultaneously, the opening of the expansion valve and the rotating speed of the compressor 2 are automatically adjusted, so that the normal operation of the air conditioner refrigerant loop system and the comfort level of the passenger cabin are ensured, and the temperature conditions of the system components corresponding to different modes are shown in a table 2.

The eight working modes listed in the invention have certain control logic, the system can judge the temperature of the passenger cabin preferentially, and then sequentially carry out heat management on the power battery 9 and the motor electric control according to actual conditions after the temperature requirement of the passenger is met, and the specific judgment logic and the control mode of the heat management system are shown in fig. 10, and the specific steps S2-S4 are shown.

S2: judging which level the temperature of the passenger cabin is in, and directly entering step S3 when the temperature level of the passenger cabin is proper; when the temperature grade of the passenger cabin is high, starting the compressor 2, starting the heat exchanger 3# 6 outside the vehicle, refrigerating the passenger cabin through the evaporator 3, and then entering the step S3; when the temperature level of the passenger cabin is low, starting the compressor 2, starting the heat exchanger 2# 5 as a condenser, heating the passenger cabin through the in-vehicle radiator 11, and then entering step S3;

S3: judging which level the temperature of the power battery 9 is at, when the temperature level of the power battery 9 is proper, performing cooling liquid self-circulation on the power battery 9, and then entering step S4; when the temperature level of the power battery 9 is high, the second expansion valve 13 is opened, the power battery 9 is communicated with the heat exchanger 1# 4, and then the step S4 is carried out; when the temperature level of the power battery 9 is low, controlling the twelve-channel integrated valve 1 to connect the power battery 9 with the heater 8 in series, heating the power battery 9, and then entering step S4;

s4: judging which level the temperature of the motor electric control system 10 is at, when the temperature level of the motor electric control system 10 is proper, the motor electric control system 10 carries out cooling liquid self-circulation, and then exits to wait for the next temperature judgment; when the temperature grade of the motor electric control system 10 is high, the motor electric control system 10 is connected with the vehicle exterior radiator 7, the electric drive LTR is entered for cooling, and then the vehicle exterior radiator exits for waiting for the next temperature judgment.

It should be emphasized that the thermal management of the present invention is not limited to the eight modes of operation, and the twelve-way integrated valve system according to the present invention may also perform a thermal management function under more conditions.

For example: when starting after long-time parking in winter, need preheat power battery 9, if the passenger does not get on the bus, can only communicate heater 8 and power battery 9, promote the coolant liquid temperature in this minor segment return circuit fast through heater 8, play the effect of heating the battery package. After the passenger gets on the vehicle, the compressor 2 system and the heat exchanger #2 are started, and the radiator 11, the heater 8 and the heat exchanger 2# 5 in the vehicle are connected in series to provide heat for the passenger cabin.

While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims

1. A twelve-channel integrated valve-based thermal management system, characterized by: the cooling liquid loop comprises a twelve-channel integrated valve, a heat exchanger 1#, a heat exchanger 2#, a heater, an external radiator, a motor electric control system, an internal radiator and a power battery, wherein in the refrigerant loop, the heat exchanger 1#, the compressor, the heat exchanger 2#, the heat exchanger 3# are sequentially connected in series through pipelines to form a loop, the refrigerant pipes of the heat exchanger 1# and the heat exchanger 2# are connected into the refrigerant loop, a second expansion valve is arranged on a pipeline at the inlet end of a refrigerant pipe of the heat exchanger 1#, the evaporator is connected in parallel with two ends of a refrigerant pipe of the heat exchanger 1#, the first expansion valve is arranged on a pipeline at the inlet end of the evaporator, the three-way valve is arranged on a pipeline between the heat exchanger 2#, the heat exchanger 3#, one port of the three-way valve is connected with the outlet end of the refrigerant pipe of the heat exchanger 2# through a pipeline, the refrigerant pipe of the heat exchanger 1# and the heat exchanger 2# are connected with the heat exchanger 3# through a three-way valve through a first port of the heat exchanger 3# through a three-way valve, and the refrigerant pipe of the heat exchanger 3# is connected with the heat exchanger 3# through a three-way valve through a first port of the heat exchanger through a three-way valve through the inlet end of the heat exchange valve;

2. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the thermal management system includes at least a functional mode one; the first functional mode comprises passenger cabin refrigeration, battery self-circulation cooling and electric drive LTR cooling, and in the first functional mode, the connection relation between the internal ports of the twelve-channel integrated valve is as follows: the port P2 is communicated with the port P7, the port P3 is communicated with the port P8, the port P4 is communicated with the port P9, the port P11 is communicated with the port P12, the port P5 is communicated with the port P6 and the port P1 is communicated with the port P10; and heat exchanger 1#, heat exchanger 2#, heater, radiator, first water pump all do not work in the car, and first stop valve is opened, and the second stop valve is closed, and first expansion valve is opened, and the second expansion valve is closed, and other parts normally work, and at this moment, passenger cabin refrigeration: in the refrigerant loop, the heat exchanger 2# does not work, a refrigerant pipe of the heat exchanger 2# is used as a common pipeline, the heat exchanger 3#, the first expansion valve, the evaporator and the compressor form an air conditioning refrigerating system together, the refrigerant circulates in a pipeline of the air conditioning refrigerating system, and absorbs heat to the air through the evaporator to cool the passenger cabin;

self-circulation cooling of the battery: in the cooling liquid loop, a second water pump works to circulate the cooling liquid in the cooling liquid pipe of the power battery;

Electric LTR cooling: in the cooling liquid loop, a cooling liquid pipe of the motor electric control system is communicated with the external radiator through switching of the ports of the twelve-channel integrated valve, and the third water pump works to enable cooling liquid in the cooling liquid pipe to circulate, and the electronic control module of the motor electric control system is cooled through the external radiator.

3. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the thermal management system at least comprises a second functional mode, wherein the second functional mode comprises passenger cabin refrigeration, battery liquid cooling and electric LTR cooling, and in the second functional mode, the connection relation between internal ports of the twelve-channel integrated valve is as follows: the port P2 is communicated with the port P9, the port P3 is communicated with the port P8, the port P4 is communicated with the port P7, the port P11 is communicated with the port P12, the port P5 is communicated with the port P6 and the port P1 is communicated with the port P10; and heat exchanger 2#, heater, radiator, first water pump all do not work in the car, and first stop valve is opened, and the second stop valve is closed, and first expansion valve and second expansion valve all open, and other parts normally work, and at this moment, passenger cabin refrigerates: in the refrigerant loop, the heat exchanger 2# does not work, a refrigerant pipe of the heat exchanger 2# is used as a common pipeline, an air conditioner refrigerating system is formed by the heat exchanger 3#, the first expansion valve, the evaporator and the compressor, the refrigerant circulates in a pipeline of the air conditioner refrigerating system, and absorbs heat to air through the evaporator to refrigerate and cool the passenger cabin;

Liquid cooling and cooling of the battery: the heat exchanger 1 works, and heat exchange can be carried out between a refrigerant pipe and a cooling liquid pipe of the heat exchanger 1; through switching of the twelve-channel integrated valve ports, a cooling liquid pipe of the power battery is communicated with a cooling liquid pipe of the heat exchanger 1#, cooling liquid in the cooling liquid pipe of the power battery absorbs heat generated by the power battery and surrounding environment and brings the heat to the cooling liquid pipe of the heat exchanger 1#, cooling liquid in the cooling liquid pipe of the heat exchanger 1# absorbs heat brought back by cooling liquid, cooling liquid in the cooling liquid pipe of the heat exchanger 1# releases heat after passing through a compressor and the heat exchanger 3#, and the temperature of the cooling liquid is reduced to form battery liquid cooling circulation;

and the electric drive LTR is used for cooling, a cooling liquid pipe of the motor electric control system is communicated with the external radiator through switching of a twelve-channel integrated valve port in a cooling liquid loop, and the third water pump works to enable cooling liquid in the cooling liquid pipe to circulate, and the cooling liquid cools an electronic control module of the motor electric control system through the external radiator.

4. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the thermal management system at least comprises a third functional mode, wherein the third functional mode comprises passenger cabin refrigeration, battery LTR cooling and electric drive self-circulation, and in the third functional mode, the connection relation between internal ports of the twelve-channel integrated valve is as follows: ports P2 and P7 are communicated, ports P3 and P12 are communicated and ports P8 and P11 are communicated, ports P4 and P6 are communicated and ports P1 and P9 are communicated, and ports P5 and P10 are communicated; and heat exchanger 1#, heat exchanger 2#, heater, radiator, first water pump all do not work in the car, and first stop valve is opened, and the second stop valve is closed, and first expansion valve is opened, and the second expansion valve is closed, and other parts normally work, and at this moment, passenger cabin refrigeration: in the refrigerant loop, a refrigerant pipe of the heat exchanger 2# is used as a common pipeline, the heat exchanger 3#, the first expansion valve, the evaporator and the compressor form an air-conditioning refrigerating system together, the refrigerant circulates in a pipeline of the air-conditioning refrigerating system, and absorbs heat to the air through the evaporator to cool the passenger cabin;

Battery LTR cooling: in the cooling liquid loop, a cooling liquid pipe of the power battery is communicated with an external radiator through switching of a twelve-channel integrated valve port, a second water pump works to enable cooling liquid in the cooling liquid pipe to circulate, and the power battery is cooled through the external radiator;

self-circulation of electric drive: in the mode, the motor electric control system does not need to carry out heat management, and the loop carries out self-circulation through the third water pump.

5. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the heat management system at least comprises a functional mode IV, wherein the functional mode IV comprises heat pump heating, battery self-circulation and electric drive self-circulation, and in the functional mode IV, the connection relation between the internal ports of the twelve-channel integrated valve is as follows: the port P2 is communicated with the port P7, the port P3 is communicated with the port P12, the port P8 is communicated with the port P11, the port P4 is communicated with the port P9, the port P1 is communicated with the port P6, and the port P5 is communicated with the port P10; the heat exchanger 1#, the heat exchanger 3#, and the external radiator do not work, the first stop valve is closed, and the second stop valve is opened, so that a bypass pipeline of the heat exchanger 3# is connected to the system; the first expansion valve is opened, the second expansion valve is closed, and other parts work normally, and at the moment, the heat pump heats: in a refrigerant loop, a heat exchanger 2# normally works, a heat pump air conditioning system is formed by the heat exchanger 2#, a bypass pipeline, a first expansion valve, an evaporator and a compressor, heat of the external environment is absorbed by the refrigerant in the evaporator, the refrigerant carries heat to circulate in a pipeline of the heat pump air conditioning system, and the heat is brought into a cooling liquid loop by the heat exchanger 2 #; in a cooling liquid loop, a vehicle radiator is communicated with a cooling liquid pipe of a heat exchanger 2# through switching of twelve-channel integrated valve ports, a first water pump works, so that cooling liquid circulates in a loop formed by the vehicle radiator, the cooling liquid pipe of the heat exchanger 2# and a heater, and heat generated by a heat pump air conditioning system is released to a passenger cabin through the vehicle radiator, wherein the heater carries out supplementary heating according to actual conditions;

Self-circulation of the battery: in the cooling liquid loop, through switching of the ports of the twelve-channel integrated valve, two ends of a cooling liquid pipe of the power battery are communicated, the second water pump works, and the temperature of the power battery is kept through self-circulation of cooling liquid in the cooling liquid pipe of the power battery;

self-circulation of electric drive: in the cooling liquid loop, two ends of a cooling liquid pipe of the motor electric control system are communicated through switching of the ports of the twelve-channel integrated valve, the third water pump works, and the temperature of an electronic control module of the motor/electric control system is kept through self-circulation of cooling liquid in the cooling liquid pipe of the motor/electric control system.

6. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the heat management system at least comprises a functional mode five, wherein the functional mode five comprises heat pump heating, battery self-circulation and motor waste heat recovery, and in the functional mode five, the connection relation between internal ports of the twelve-channel integrated valve is as follows: the port P2 is communicated with the port P10, the port P5 is communicated with the port P7, the port P3 is communicated with the port P12, the port P8 is communicated with the port P11, the port P4 is communicated with the port P9, and the port P1 is communicated with the port P6; the heat exchanger 3# and the external radiator do not work, the first stop valve is closed, and the second stop valve is opened, so that a bypass pipeline of the heat exchanger 3# is connected to the system; the first expansion valve and the second expansion valve are opened, other parts work normally, and at the moment, the heat pump heats: in the refrigerant loop, a second expansion valve is opened, a heat exchanger 1# is connected to the system, the heat exchanger 1# and the heat exchanger 2# work normally, a heat pump air conditioning system is formed by the heat exchanger 1#, the heat exchanger 2#, a bypass pipeline, a first expansion valve, a second expansion valve, an evaporator and a compressor, the heat of the external environment is absorbed by the refrigerant in the evaporator, the heat generated by a motor electric control system transferred by cooling liquid and absorbed by the refrigerant in the heat exchanger 1# is carried by the refrigerant to circulate in the pipeline of the heat pump air conditioning system, and the heat is brought into the cooling liquid loop by the heat exchanger 2 #; in a cooling liquid loop, a vehicle radiator is communicated with a cooling liquid pipe of a heat exchanger 2# through switching of twelve channel integrated valve ports, a first water pump works, cooling liquid circulates in a loop formed by the vehicle radiator, the cooling liquid pipe of the heat exchanger 2# and a heater, and heat generated by a heat pump air conditioning system and heat generated by a recovered motor electric control system are released to a passenger cabin through the vehicle radiator, wherein the heater carries out supplementary heating according to actual conditions;

and (3) recovering waste heat of a motor: in the cooling liquid loop, through switching of twelve-channel integrated valve ports, two ends of a cooling liquid pipe of a motor electric control system are communicated with two ends of a cooling liquid pipe of a heat exchanger 1#, heat generated by energy loss of the motor electric control system is absorbed by cooling liquid in the cooling liquid pipe, heat in the cooling liquid is transferred to a refrigerant through the heat exchanger 1#, and the heat is introduced into a heat pump air conditioning system along with the refrigerant.

7. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the heat management system at least comprises a functional mode six, wherein the functional mode six comprises heat pump heating, battery heating and motor waste heat recovery, and in the functional mode six, the connection relation between the internal ports of the twelve-channel integrated valve is as follows: the port P2 is communicated with the port P10, the port P5 is communicated with the port P7, the port P3 is communicated with the port P12, the port P4 is communicated with the port P8, the port P9 is communicated with the port P11, and the port P1 is communicated with the port P6; the heat exchanger 3# and the external radiator do not work, the first stop valve is closed, and the second stop valve is opened, so that a bypass pipeline of the heat exchanger 3# is connected to the system; the first expansion valve and the second expansion valve are both opened, other parts work normally, and at this time, the heat pump heating and the battery heating: in the refrigerant loop, a second expansion valve is opened, a heat exchanger 1# is connected to the system, the heat exchanger 1# and the heat exchanger 2# work normally, a heat pump air conditioning system is formed by the heat exchanger 1#, the heat exchanger 2#, a bypass pipeline, a first expansion valve, a second expansion valve, an evaporator and a compressor, the heat of the external environment is absorbed by the refrigerant in the evaporator, the heat generated by a motor electric control system transferred by cooling liquid and absorbed by the refrigerant in the heat exchanger 1# is carried by the refrigerant to circulate in the pipeline of the heat pump air conditioning system, and the heat is brought into the cooling liquid loop by the heat exchanger 2 #; in a cooling liquid loop, through switching of twelve channel integrated valve ports, a radiator in a vehicle, a heat exchanger No. 2 and a cooling liquid pipe of a power battery are sequentially connected in series, a first water pump and a second water pump work simultaneously, so that cooling liquid circulates in a loop formed by the radiator in the vehicle, the cooling liquid pipe of the heat exchanger No. 2, a heater and the cooling liquid pipe of the power battery, heat generated by a heat pump air conditioning system and heat generated by a recovered motor electric control system are released to a passenger cabin through the radiator in the vehicle, and meanwhile, the power battery is heated through the cooling liquid in the cooling liquid pipe of the power battery, wherein the heater is used for carrying out supplementary heating according to actual conditions;

8. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the thermal management system at least comprises a functional mode seven, wherein the functional mode seven comprises heat pump heating, battery heating and electric drive LTR cooling, and in the functional mode seven, the connection relation between internal ports of the twelve-channel integrated valve is as follows: ports P2 and P7 are communicated, ports P5 and P6 are communicated, ports P1 and P10 are communicated, ports P3 and P12 are communicated, ports P4 and P8 are communicated, and ports P9 and P11 are communicated; the heat exchanger 1# and the heat exchanger 3# do not work, the first stop valve is closed, and the second stop valve is opened, so that a bypass pipeline of the heat exchanger 3# is connected to the system; opening a first expansion valve to enable the evaporator to be connected into the system; the second expansion valve is closed, so that the heat exchanger 1# is not connected into the system, other parts work normally, and at the moment, the heat pump heating and the battery heating are carried out: in a refrigerant loop, a heat exchanger 2# normally works, a heat pump air conditioning system is formed by the heat exchanger 2#, a bypass pipeline, a first expansion valve, an evaporator and a compressor, heat of the external environment is absorbed by the refrigerant in the evaporator, the refrigerant carries heat to circulate in a pipeline of the heat pump air conditioning system, and the heat is brought into a cooling liquid loop by the heat exchanger 2 #; in a cooling liquid loop, through switching of twelve channel integrated valve ports, a radiator in a vehicle, a heat exchanger No. 2 and a cooling liquid pipe of a power battery are sequentially connected in series, a first water pump and a second water pump work simultaneously, so that cooling liquid circulates in a loop formed by the radiator in the vehicle, the cooling liquid pipe of the heat exchanger No. 2, a heater and the cooling liquid pipe of the power battery, heat generated by a heat pump air conditioning system is released to a passenger cabin through the radiator in the vehicle, and meanwhile, the power battery is heated through cooling liquid in the cooling liquid pipe of the power battery, wherein the heater is used for carrying out supplementary heating according to actual conditions;

Electric LTR cooling: in the cooling liquid loop, a cooling liquid pipe of the motor electric control system is communicated with the external radiator through switching of the twelve-channel integrated valve ports, and the third water pump works to enable cooling liquid in the cooling liquid pipe to circulate, and the electronic control module of the motor electric control system is subjected to liquid cooling through the external radiator.

9. The twelve-channel integrated valve-based thermal management system of claim 1, wherein: the thermal management system at least comprises a functional mode eight, wherein the functional mode eight comprises heat pump heating, battery cooling and electric drive LTR cooling, and in the functional mode eight, the connection relation between internal ports of the twelve-channel integrated valve is as follows: ports P2 and P9 communicate and ports P4 and P7 communicate, ports P5 and P6 communicate and ports P1 and P10 communicate, ports P3 and P12 communicate and ports P8 and P11 communicate; only the heat exchanger 3# does not work, the first stop valve is closed, and the second stop valve is opened, so that a bypass pipeline of the heat exchanger 3# is connected to the system; the first expansion valve and the second expansion valve are opened, so that the evaporator and the heat exchanger 1# are connected into the system, other parts work normally, and at the moment, the heat pump heats: in a refrigerant loop, a heat exchanger 2# normally works, a heat pump air conditioning system is formed by the heat exchanger 2#, a bypass pipeline, a first expansion valve, an evaporator and a compressor, heat of the external environment is absorbed by the refrigerant in the evaporator, the refrigerant carries heat to circulate in a pipeline of the heat pump air conditioning system, and the heat is brought into a cooling liquid loop by the heat exchanger 2 #; in a cooling liquid loop, a vehicle radiator is communicated with a cooling liquid pipe of a heat exchanger 2# through switching of twelve-channel integrated valve ports, a first water pump works, so that cooling liquid circulates in a loop formed by the vehicle radiator, the cooling liquid pipe of the heat exchanger 2# and a heater, and heat generated by a heat pump air conditioning system is released to a passenger cabin through the vehicle radiator, wherein the heater carries out supplementary heating according to actual conditions; meanwhile, the second expansion valve is opened, the heat exchanger 1# works normally, and the refrigerant in the refrigerant pipe of the heat exchanger 1# absorbs heat generated by the power battery recovered by the cooling liquid in the cooling liquid pipe and carries the heat to enter the heat pump air conditioning system;

And (3) cooling the battery: in a cooling liquid loop, a cooling liquid pipe of a power battery is communicated with a cooling liquid pipe of a heat exchanger 1# through switching of a twelve-channel integrated valve port, the cooling liquid in the cooling liquid pipe of the power battery absorbs heat generated by the power battery and brings the heat to the cooling liquid pipe of the heat exchanger 1#, the cooling liquid in the cooling liquid pipe of the heat exchanger 1# absorbs the heat recovered by the cooling liquid, and the cooling liquid in the cooling liquid pipe of the heat exchanger 1# enters a heat pump air conditioning system through a compressor and a heat exchanger 2 #;

and in the cooling liquid loop, a cooling liquid pipe of the motor electric control system is communicated with the external radiator through switching of a twelve-channel integrated valve port, and the third water pump works to circulate cooling liquid in the cooling liquid pipe and cool the electronic control module of the motor electric control system through the external radiator.

10. A twelve-channel integrated valve-based thermal management method, characterized by: use of a thermal management system according to any one of claims 1-9, and comprising the steps of: