CN115036609A - Vehicle battery pack cooling method and system, electronic equipment and vehicle - Google Patents

Abstract

The invention provides a vehicle battery pack cooling method and system, electronic equipment and a vehicle. Relates to the field of automobile thermal management. The invention comprises the following steps: obtaining the battery core temperature and the coolant temperature of a vehicle battery pack, locating the highest temperature of the battery pack battery core in a first battery core temperature range, and enabling the coolant temperature to meet the working temperature condition of first-stage passive cooling, executing first-stage passive cooling, locating the highest temperature of the battery pack battery core in a second battery core temperature range, and enabling the coolant temperature to meet the working temperature condition of second-stage passive cooling, executing second-stage passive cooling, locating the highest temperature of the battery pack battery core in a second battery core temperature range, and enabling the coolant temperature not to meet the working temperature condition of second-stage passive cooling, and executing active cooling. The temperature of the battery pack is controlled by using passive cooling in advance, so that the temperature rise of the battery pack is slowed down, the starting time of a compressor of an air conditioning system is delayed, the energy consumption of the air conditioning system is reduced, the endurance of the whole vehicle is improved, and the dynamic property of the whole vehicle is enhanced.

Description

Vehicle battery pack cooling method, system, electronic device, and vehicle

technical field

This article relates to the field of automotive thermal management, and in particular to a vehicle battery pack cooling method, system, electronic device and vehicle.

Background technique

The market share of electric vehicles is gradually increasing, and users' attention to electric vehicles is not only limited to cost and battery life, but also has higher and higher power requirements for electric vehicles. The battery pack cooling methods of electric vehicles are divided into natural cooling, forced air cooling, forced water cooling and direct refrigerant cooling according to the cooling efficiency.

In the related art, a widely used battery pack cooling method is forced water cooling, that is, heat exchange with a refrigerant through a cooling liquid. However, due to the limitation of compressor power, when the vehicle cockpit and battery pack need to be cooled, the compressor needs to be in a high load state, which increases the power consumption of the vehicle and affects the battery life of the vehicle.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a vehicle battery pack cooling method, system, and vehicle, aiming at addressing the problems existing in the above special circumstances.

In order to solve the above-mentioned technical problems, the present invention is achieved in this way:

In a first aspect, an embodiment of the present invention provides a vehicle battery pack cooling method, the method comprising:

Obtain vehicle battery cell temperature and coolant temperature;

If the highest temperature of the cells of the battery pack is within the first cell temperature range, and the temperature of the coolant satisfies the operating temperature conditions of the first-stage passive cooling, the first-stage passive cooling is performed on the battery pack; wherein , the temperature range of the first cell is located within the optimal operating temperature range of the battery pack, or, is the same as the optimal operating temperature range of the battery pack;

If the highest temperature of the cells of the battery pack is within the temperature range of the second cell, and the temperature of the cooling liquid satisfies the working temperature condition of the second-stage passive cooling, the second-stage passive cooling is performed on the battery pack;

If the highest temperature of the cells of the battery pack is within the temperature range of the second cell, and the temperature of the cooling liquid does not meet the working temperature condition of the second-stage passive cooling, active cooling is performed;

Wherein, the minimum value of the second cell temperature range is greater than the maximum value of the first cell temperature range.

Optionally, acquiring vehicle operating conditions, where the vehicle operating conditions include driving operating conditions and fast charging operating conditions;

If the highest temperature of the cells of the battery pack is within the first cell temperature range, and the temperature of the coolant satisfies the working temperature condition of the first-stage passive cooling, then the first-stage passive cooling is performed on the battery pack Steps include:

If the vehicle operating condition is the driving operating condition and the coolant temperature is lower than the first execution temperature of the cooling liquid, the battery pack is passively cooled until the highest temperature of the battery cell is lower than the driving operating condition the first exit condition temperature; or the coolant temperature is higher than the first end temperature of the coolant;

If the vehicle operating condition is the fast charging operating condition, and the coolant temperature is lower than the second cooling liquid temperature, the battery pack is passively cooled until the highest cell temperature of the battery pack is lower than the fast charging temperature The temperature of the first exit condition of the working condition; or the temperature of the cooling liquid is higher than the second termination temperature of the cooling liquid. Optionally, if the highest temperature of the cells of the battery pack is within the temperature range of the second cell, and the temperature of the cooling liquid satisfies the working temperature condition of the second-stage passive cooling, the first step is performed on the battery pack. The two-stage passive cooling steps include:

If the vehicle operating condition is a driving condition and the coolant temperature is lower than the first execution temperature of the coolant, passively cool the battery pack until the highest temperature of the battery cells is lower than the driving temperature The temperature of the second exit condition of the working condition, the highest temperature of the battery cell in the battery pack is located in the third cell temperature range, or the temperature of the cooling liquid is higher than the first termination temperature of the cooling liquid;

If the vehicle operating condition is the fast charging operating condition, and the coolant temperature is lower than the second cooling liquid temperature, the battery pack is passively cooled until the maximum cell temperature of the battery pack is lower than The temperature of the second exit condition in the fast charging condition, the highest temperature of the battery cell in the battery pack is located in the fourth cell temperature range, or the temperature of the cooling liquid is higher than the second termination temperature of the cooling liquid;

Wherein, the minimum value of the third cell temperature range is greater than the minimum value of the fourth cell temperature range, and the minimum value of the fourth cell temperature range is greater than the maximum value of the second cell temperature range.

Optionally, if the highest temperature of the cells in the battery pack is within the temperature range of the second cell, and the temperature of the cooling liquid does not meet the working temperature conditions of the second-stage passive cooling, the step of performing the active cooling includes:

If the highest temperature of the battery cells is within the second cell temperature range, and the temperature of the coolant does not meet the working temperature conditions of the second-stage passive cooling, the active cooling mode is turned on, and the air conditioning system is used to cool the batteries. The battery pack is cooled.

In a second aspect, an embodiment of the present invention provides a vehicle battery pack cooling system, the system is used to passively cool the battery pack, and the system includes:

Radiator branch, battery pack branch, drive system branch, air conditioning branch, coolant on-off valve and controller, of which:

The first ends of the radiator branch, the battery pack branch, the drive system branch, and the air conditioning branch are respectively connected to the coolant on-off valve, the radiator branch, the battery The second end of the pack branch, the drive system branch, and the air conditioner branch are connected, wherein a battery pack is arranged on the battery pack branch;

The controller is used to control the conduction of different pipelines of the coolant on-off valve, so as to realize the above method.

Further, the system further includes a first branch connecting the second end of the radiator branch and the coolant on-off valve, and connecting the second end of the battery pack branch and the coolant on-off valve the second branch of the radiator, when the first-stage passive cooling and the second-stage passive cooling are performed on the battery pack, the controller controls the coolant on-off valve so that the second end of the radiator branch is connected to the The first end of the battery pack branch is connected, and the second end of the battery pack branch is connected to the first end of the radiator branch.

Further, when the battery pack is actively cooled, the controller controls the coolant on-off valve to make the first end of the air conditioning branch and the first end of the battery pack branch conduct.

Further, the drive system branch includes: an overflow irrigation and a drive bridge, wherein:

One end of the overflow irrigation is the second end of the drive system branch;

The other end of the overflow irrigation is connected to one end of the drive bridge;

The other end of the drive bridge is the first end of the drive system branch.

A third aspect of the embodiments of the present invention provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

memory for storing computer programs;

The processor is configured to implement the method steps proposed in the first aspect of the embodiments of the present invention when executing the program stored in the memory.

A fourth aspect of the embodiments of the present invention provides a vehicle, where the vehicle at least includes the vehicle battery pack cooling system described in the second aspect of the embodiments of the present invention.

The embodiments of the present invention include the following advantages: obtaining the temperature of the battery cells of the vehicle battery pack and the temperature of the cooling liquid, when the highest temperature of the cells in the battery pack is located in the first cell temperature range, and the temperature of the cooling liquid satisfies the working temperature conditions of the first stage passive cooling, Perform the first-stage passive cooling. If the highest temperature of the battery pack cells is in the second cell temperature range, and the coolant temperature meets the operating temperature conditions of the second-stage passive cooling, the second-stage passive cooling is performed. When the temperature is within the temperature range of the second cell, and the temperature of the cooling liquid does not meet the working temperature condition of the passive cooling in the second stage, active cooling is performed. Passive cooling is used in advance to control the temperature of the battery pack, thereby slowing down the temperature rise of the battery pack and delaying the start-up time of the compressor of the air conditioning system, which is conducive to reducing the energy consumption of the air conditioning system, improving the battery life of the whole vehicle, and enhancing the power of the whole vehicle.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a flow chart of steps of a vehicle battery pack cooling method in an embodiment of the present invention;

2 is a schematic diagram of pipeline connections of a vehicle battery pack cooling system in an embodiment of the present invention;

3 is a schematic diagram of a passive cooling circulation loop in an embodiment of the present invention;

4 is a schematic diagram of a vehicle including a vehicle battery pack cooling system according to an embodiment of the present invention;

5 is a schematic diagram of functional modules of an electronic device in an embodiment of the present invention;

Description of drawings:

1-low temperature radiator, 2-electronic fan, 3-temperature sensor, 4-overflow tank, 5-first electronic water pump, 6-charger three-in-one, 7-drive bridge, 8-temperature sensor, 9-cooling Liquid six-way valve, 10-battery cooler, 11-power battery, 12-second electronic water pump, 13-coolant four-way valve.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

In the related art, forced water cooling is lower in cost than direct battery pack cooling, and higher in cooling efficiency than other solutions, but increases the cooling load of the air conditioning system, increases the power consumption of the air conditioning, and affects the battery life of the vehicle. Under the dual cooling conditions (crew cabin cooling and battery pack cooling), the high temperature of the battery pack will trigger the power limiting strategy, resulting in reduced vehicle power and affecting user experience.

The inventor found in practice that when the temperature of the battery pack enters the optimal working condition and the external conditions are satisfied, the passive cooling function is used to control the temperature of the battery pack in advance, slow down the temperature rise of the battery pack, and delay the time when the battery pack triggers active cooling. , thereby reducing the power consumption of the compressor of the air conditioning system; when the maximum temperature of the battery cell exceeds the optimal working condition limit, and the external conditions are satisfied, the passive cooling of the battery pack is also given priority, and when the external conditions are not satisfied, switch For active cooling, on the one hand, it can reduce the power consumption of the compressor. On the other hand, when the air conditioning system uses the heat pump solution, the application scenarios of the heat pump system can be expanded to avoid battery pack cooling affecting the work of the heat pump system.

Based on the above inventive concept, an embodiment of the present invention provides a method for cooling a battery pack of a vehicle. Referring to FIG. 1 , FIG. 1 shows a flowchart of steps of a method for cooling a battery pack of a vehicle according to an embodiment of the present application, and the method includes the following steps :

Step S101: Acquire the temperature of the battery cells of the vehicle battery pack and the temperature of the coolant.

The controller obtains the temperature of the battery pack cells of the vehicle through the temperature sensor, and uses the highest temperature at the battery pack cells as the conditional temperature for subsequent judgment; the controller obtains the coolant temperature through the temperature sensor set at the liquid outlet end of the low-temperature radiator group, The cooling liquid plays the role of heat exchange and cooling in the entire cooling system. It can be understood that the temperature sensor can also be arranged near the water inlet of the battery pack branch, which is not limited here.

Step S102: If the highest temperature of the cells of the battery pack is within the first cell temperature range, and the temperature of the coolant meets the working temperature conditions of the first-stage passive cooling, then the first-stage passive cooling is performed on the battery pack. Cooling; wherein, the temperature range of the first cell is located within the optimal working temperature range of the battery pack, or is the same as the optimal working temperature range of the battery pack.

It can be understood that the optimal working temperature of various batteries is different and can be determined according to the actual situation, such as the standard working temperature of the battery. Taking ternary lithium batteries, lithium iron phosphate batteries and cobalt-free battery packs in the current market as an example, the optimal operating temperature range is between 25°C and 35°C. Take the temperature range of the first cell as 25°C-35°C as an example. The battery pack cell temperature refers to the maximum value of multiple sets of data in one battery pack cell temperature detection. When the controller detects that the battery pack cell's maximum temperature is between 25°C and 35°C, and the coolant temperature meets the preset temperature In the working condition, the preset working condition of the coolant temperature means that the temperature of the coolant meets the temperature conditions for passive cooling. When the temperature of the coolant is satisfied, if the temperature of the coolant is lower than 20°C, it will enter the first stage of passive cooling. Use the passive cooling function to control the temperature of the battery pack in advance, so as to slow down the temperature rise of the battery pack, delay the time when the battery pack triggers active cooling, and realize the passive cooling before entering the optimal operating temperature range of the battery to cool the battery pack.

Step S103: If the highest temperature of the battery pack cell is within the second cell temperature range, and the coolant temperature satisfies the working temperature condition of the second-stage passive cooling, then the second-stage passive cooling is performed on the battery pack. cool down.

Continue to take the above-mentioned first cell temperature range between 25°C and 35°C as an example. The second cell temperature range refers to the temperature range with a temperature value greater than 35°C. When the vehicle is running, the temperature of the battery pack cell continues to rise. However, the passive cooling in the first stage cannot suppress the rising trend of the temperature of the battery cells, so that the temperature of the cells in the battery pack is greater than 35 °C. When the temperature of the second cell is in the second cell temperature range, if the temperature of the coolant at this time still meets the temperature of the coolant. When the working conditions are set, enter the second stage of passive cooling, that is, the temperature of the battery cells is still controlled by passive cooling, wherein the exit conditions of the first stage of passive cooling and the second stage of passive cooling are different. It should be noted that the working temperature conditions of the passive cooling in the first stage and the working temperature conditions of the passive cooling in the second stage may be the same or different, which are not limited herein.

Step S104: If the highest temperature of the battery cell is within the second cell temperature range, and the coolant temperature does not meet the working temperature condition of the second-stage passive cooling, perform active cooling.

When the highest temperature of the battery cell is within the temperature range of the second cell, after cooling and cooling through the passive heat dissipation in the second stage, the trend of temperature rise still cannot be suppressed, and the temperature of the heat dissipation liquid at this time does not meet the second temperature. When the working temperature conditions of stage passive cooling are reached, the battery pack cannot be cooled by heat exchange of the coolant. At this time, active cooling needs to be introduced, that is, a more powerful and effective cooling process is performed on the battery pack through the air conditioning system.

In this embodiment, when the temperature of the battery pack enters the optimal operating temperature range and the external conditions are satisfied, the first-stage passive cooling function is used to control the temperature of the battery pack in advance, slow down the temperature rise of the battery pack, and delay the battery pack to trigger the active cooling function. Cooling time, thereby reducing the power consumption of the compressor of the air conditioning system; when the highest temperature of the battery pack cell exceeds the optimal operating temperature range, and the external conditions are satisfied, the passive cooling of the battery pack is also preferentially used, that is, the passive cooling of the second stage. Cooling function, when the external conditions are not satisfied, switch to active cooling to enhance the power of the vehicle, and the power consumption of passive cooling is much less than the power of the compressor. On the one hand, it can reduce the power consumption of the compressor and save energy. On the other hand, the compressor load is reduced in cases where both the vehicle cockpit and the battery pack need to be cooled.

In a feasible implementation, the method further includes:

Obtain vehicle operating conditions, where the vehicle operating conditions include driving operating conditions and fast charging operating conditions;

If the highest temperature of the cells of the battery pack is within the first cell temperature range, and the temperature of the cooling liquid satisfies the working temperature conditions of the first-stage passive cooling, the first-stage passive cooling is performed on the battery pack, including: : If the vehicle operating condition is the driving condition and the coolant temperature is lower than the first cooling liquid temperature, the battery pack will be passively cooled until the maximum temperature of the battery cell is lower than the first exit condition temperature of the driving condition ; or the coolant temperature is higher than the first end temperature of the coolant;

If the vehicle operating condition is the fast charging operating condition, and the coolant temperature is lower than the second operating temperature of the cooling liquid, the battery pack is passively cooled until the highest temperature of the battery cell is lower than the first exit condition of the fast charging operating condition. temperature; or the coolant temperature is higher than the second coolant end temperature.

In this embodiment, for different working conditions of the vehicle, the specific judgment conditions for the first-stage passive cooling performed by the vehicle are different. The fast charging condition refers to the state in which the vehicle is charged with a higher charging power. Because the drive bridge will not work under the fast charging condition, the temperature of the coolant at the outlet of the bridge is lower than that in the driving state, and because the temperature of the battery pack rises faster during the fast charging, in order to ensure the safety of the rechargeable battery, the patent claims The passive cooling strategy described above distinguishes between the fast charging condition and other conditions, and the other conditions refer to the driving conditions. Compared with the fast charging condition, the calorific value of the battery pack in the driving condition is smaller, so the temperature rise trend is lower, so the demand for cooling is also lower. Therefore, when the highest cell temperature is within the first cell temperature range, the operating conditions of the vehicle are obtained, or when the vehicle starts to run, the operating conditions of the vehicle are obtained first, and this application does not limit the sequence.

When the vehicle is in driving condition, as shown in the demand table in Table 1, if the maximum temperature Ta of the battery pack cell is located in the first cell temperature range of 25℃<Ta≤35℃, and the coolant temperature Tb is lower than The first execution temperature of the cooling liquid, that is, Tb≤20°C, executes the first stage of passive cooling, that is, the cooling liquid is cooled by the low-temperature radiator group, so as to realize the cooling of the battery pack. Until the highest temperature of the battery pack cell is lower than the temperature of the first exit condition of the electric vehicle, that is, Ta≤23°C, it means that the suppression of the rising trend of the battery pack temperature is completed at this time, and the temperature of the battery pack is at a level that does not frequently occur. The value that triggers passive cooling in the first stage; or the temperature of the coolant is higher than the first termination temperature of the coolant, that is, Tb>25°C, indicating that the coolant at this time cannot meet the cooling of the battery pack due to the large heat dissipation of the battery pack. Demand cannot suppress the rising trend of battery pack temperature.

When the vehicle is in the fast charging condition, according to the demand table shown in Table 2, if the maximum temperature Ta of the battery pack cell is in the first cell temperature range of 25℃<Ta≤35℃, and the coolant temperature Tb is low At the second execution temperature of the cooling liquid, that is, Tb≤5°C, due to the greater demand for heat dissipation, the requirement for the heat exchange capacity of the cooling liquid is greater, so the temperature of the cooling liquid is lower. The first stage of passive cooling is performed, that is, the cooling of the cooling liquid through the low-temperature radiator group, thereby realizing the cooling of the battery pack. Until the maximum temperature of the battery pack cell is lower than the first exit condition temperature of the fast charging condition, that is, Ta≤23°C, it means that the suppression of the rising trend of the battery pack temperature is completed at this time, and the temperature of the battery pack is at a level that does not frequently occur. The value that triggers passive cooling in the first stage; or the temperature of the coolant is higher than the second termination temperature of the coolant, that is, Tb>10°C, indicating that the coolant at this time cannot satisfy the cooling of the battery pack due to the large heat dissipation of the battery pack. Demand cannot suppress the rising trend of battery pack temperature.

In a feasible implementation manner, if the highest temperature of the cells in the battery pack is within the temperature range of the second cell, and the temperature of the coolant satisfies the operating temperature condition of the second-stage passive cooling, the battery The package performs a second phase of passive cooling, including:

If the vehicle operating condition is the driving operating condition, and the coolant temperature is lower than the first execution temperature of the cooling liquid, the battery pack is passively cooled until the highest temperature of the battery cell is lower than the second exit condition temperature of the driving operating condition, The highest temperature of the battery cell is in the third cell temperature range or the coolant temperature is higher than the first end temperature of the coolant;

If the vehicle operating condition is the fast charging operating condition, and the coolant temperature is lower than the second operating temperature of the cooling liquid, the battery pack is passively cooled until the highest temperature of the battery cell is lower than the second exiting condition of the fast charging operating condition. The temperature and the highest temperature of the battery cells are in the fourth cell temperature range or the coolant temperature is higher than the second end temperature of the coolant;

Wherein, the minimum value of the third cell temperature range is greater than the minimum value of the fourth cell temperature range, and the minimum value of the fourth cell temperature range is greater than the maximum value of the second cell temperature range.

In this embodiment, when the vehicle is in a driving condition, that is, the vehicle is in a normal driving condition. As shown in the demand table in Table 1, if the highest temperature Ta of the battery pack cell is located in the second cell temperature range, that is, when 35°C<Ta, and the cooling liquid temperature Tb is lower than the first execution temperature of the cooling liquid, that is, Tb ≤20°C, the second stage of passive cooling is performed, that is, the cooling liquid is cooled by the low-temperature radiator group, so as to realize the cooling of the battery pack. Until the highest temperature of the battery pack cell is lower than the temperature of the second exit condition under the driving condition, that is, Ta≤33°C, it means that the suppression of the rising trend of the battery pack temperature is completed at this time, and the temperature of the battery pack is at a level that will not trigger frequently. The value of passive cooling in the second stage; or the temperature of the cooling liquid is higher than the first termination temperature of the cooling liquid, that is, Tb>25°C, or the highest temperature of the battery pack cell is located in the third cell temperature range, that is, when Ta>45°C, It means that the cooling liquid at this time can no longer meet the cooling requirements of the battery pack due to the large heat dissipation of the battery pack, and cannot suppress the rising trend of the temperature of the battery pack.

When the vehicle is in the fast charging condition, the demand table is shown in Table 2. If the highest temperature Ta of the battery cells is in the second cell temperature range of 35°C<Ta, and the cooling liquid temperature Tb is lower than the second cooling liquid temperature, for example, Tb≤5°C. Due to the greater demand for heat dissipation under fast charging conditions, the heat exchange capacity of the coolant is required to be greater, so the temperature of the coolant needs to be lower. When performing passive cooling in the second stage, the cooling liquid is circulated through the low-temperature radiator group to cool down the battery pack. Until the highest temperature of the battery pack cell is lower than the second exit condition temperature of the fast charging condition, that is, Ta≤33°C, it means that the rising trend of the battery pack temperature can be suppressed at this time, and the temperature of the battery pack is at a level that does not frequently occur. The value that triggers the passive cooling condition of the second stage; or when the temperature of the coolant is higher than the second termination temperature of the coolant, that is, Tb>10°C, the passive cooling zone of the second stage will also be exited at this time; there is another case that the battery The highest temperature of the battery pack is located in the fourth cell temperature range, that is, when Ta>40°C, since the fast charging condition requires more cooling, it is necessary to start active heat dissipation in advance to suppress the rising trend of the battery pack temperature. In the above cases, it means that due to the large heat dissipation of the battery pack, passive cooling can no longer meet the cooling requirements of the battery pack, and cannot suppress the rising trend of the battery pack temperature. Active cooling needs to be introduced to reduce the battery pack temperature.

In a feasible implementation manner, if the highest temperature of the cells in the battery pack is within the second cell temperature range, and the temperature of the cooling liquid does not meet the operating temperature conditions of the second-stage passive cooling, active cooling is performed include:

If the highest temperature of the battery cells is within the second cell temperature range, and the temperature of the coolant does not meet the working temperature conditions of the second-stage passive cooling, the active cooling mode is turned on, and the air conditioning system is used to cool the batteries. The battery pack is cooled.

In this embodiment, the battery pack needs to be dissipated through active heat dissipation and the air conditioning system, so as to meet the cooling requirement of the battery pack.

Table 1: Judgment table of battery pack passive cooling function requirements under driving conditions

Table 2: Judgment table of battery pack passive cooling function requirements under fast charging conditions

An embodiment of the present invention further provides a vehicle battery pack cooling system. Referring to FIG. 2 , a schematic diagram of a branch circuit connection of a vehicle battery pack cooling system according to the present invention is shown, and the system includes:

Radiator branch, battery pack branch, drive system branch, air conditioning branch, coolant on-off valve and controller, of which:

The first ends of the radiator branch, the battery pack branch, the drive system branch, and the air conditioning branch are respectively connected to the coolant on-off valve, the radiator branch, the battery The second end of the pack branch, the drive system branch, and the air conditioner branch are connected, wherein a battery pack is arranged on the battery pack branch;

The controller is used to control the conduction of different pipelines of the coolant on-off valve, so as to implement the method according to the first aspect of the embodiment of the present invention.

In this embodiment, according to the vehicle battery pack cooling method proposed in the first aspect of the embodiment, the controller controls the on-off state of the coolant on-off valve under different working conditions, so as to realize the communication between different branches. corresponding circuit. Different cooling strategies of passive cooling and active cooling are realized, and then the temperature rise trend of the battery pack can be suppressed.

In a feasible implementation manner, the system further includes a first branch connecting the second end of the radiator branch and the cooling liquid on-off valve, and connecting the second end of the battery pack branch and all the second branch of the coolant on-off valve, the controller controls the coolant on-off valve to enable the radiator when the first-stage passive cooling and the second-stage passive cooling are performed on the battery pack. The second end of the branch is connected to the first end of the battery pack branch, and the second end of the battery pack branch is connected to the first end of the radiator branch.

In this embodiment, as shown in FIG. 3 , the radiator branch may include: a coolant on-off valve, a low-temperature radiator 1 , an electronic fan 2 and a temperature sensor 3 , and the battery pack branch may include: a power battery 11 and a first Two electronic water pumps 12 . The coolant on-off valve can be a coolant six-way valve 9, or a combination of other valves. Taking the coolant six-way valve 9 as an example, the first end of the radiator branch can be the water inlet pipeline of the low temperature radiator 1 , and the second end of the radiator branch can be the water outlet pipeline of the low temperature radiator 1 . The first end of the battery pack branch can be the water inlet pipeline of the power battery 11 , and the second end of the battery pack branch can be the water outlet pipeline of the power battery 11 . When performing passive cooling in the first and second stages, the c-d and e-b of the coolant six-way valve 9 are turned on respectively, so that the radiator branch and the battery pack branch form a loop to realize the circulation of the coolant. The cooling liquid flows in from the water inlet pipeline of the power battery 11, takes away the heat of the power battery 11 through the principle of heat exchange, and flows back to the c-end pipeline of the cooling liquid six-way valve 9 through the cooling liquid four-way valve 13, and flows into the low temperature The water inlet pipeline of the radiator 1 is then returned to the e-end pipeline of the coolant six-way valve 9, and finally flows to the water inlet pipeline of the power battery 11 through the second electronic water pump 12. The water outlet pipeline of the low temperature radiator group is also provided with There is a temperature sensor 3 for detecting the temperature of the coolant. In the circuit, the passive cooling function of the battery pack is realized by the low-temperature radiator 1 in conjunction with the second electronic water pump 12 and the electronic fan 2, and the cooling effect is achieved by exchanging heat between the cooling liquid and the external ambient air. This solution adopts the structure of sharing the coolant six-way valve 9 with other branches, and cooperates with a plurality of three-way valves to switch and conduct, which can effectively reduce the number of parts and components, which is beneficial to the assembly layout and saving layout space.

In a feasible implementation manner, when the battery pack is actively cooled, the controller controls the cooling liquid on-off valve so that the first end of the air conditioning branch and the battery pack branch are first One end is turned on.

In this embodiment, as shown in FIG. 2 , the air conditioning branch includes a battery cooler 10 . The first end of the air conditioning branch can be the water inlet pipeline of the battery cooler 10 , and the second end of the radiator branch can be the water outlet pipeline of the battery cooler 10 . One end of the pipeline of the battery cooler 10 is connected to the pipeline of the a-end of the six-way cooling liquid valve 9. When the cooling effect of the passive cooling cannot meet the cooling demand of the battery pack, the a-b ends of the six-way cooling liquid valve 9 are connected to conduct. The air conditioning branch and the battery pack branch form a loop, and the battery pack is actively dissipated through the air conditioning system.

In a feasible implementation manner, the drive system branch includes: an overflow irrigation 4 and a drive bridge 7, wherein:

One end of the overflow irrigation 4 is the second end of the drive system branch;

The other end of the overflow irrigation 4 is connected with one end of the drive bridge 7;

The other end of the drive bridge 7 is the first end of the drive system branch.

In this embodiment, as shown in FIG. 2, in the drive system branch, one end of the overflow irrigation 4 is connected to the radiator branch, and the other end is connected to the first electronic water pump 5. When the drive system branch is a heat pump air conditioning system Provides a heat source for use in the passenger compartment using heat pump dehumidification and heat pump heating, the other end of the first electronic water pump 5 is connected to the charger three-in-one 6 and the drive bridge 7, and the charger three-in-one 6 is a kind of charging controller. A temperature sensor 8 is provided at the outlet of the water outlet of the drive axle 7 for monitoring the temperature of the cooling liquid. The other end of the drive bridge 7 is finally connected to the F end of the coolant six-way valve 9, and the heat source is provided through the air conditioning branch. When the heat pump air conditioning system works in the dehumidification and heating modes, if the battery pack has cooling requirements, it can be based on the actual situation. The passive cooling function is given priority to avoid mutual interference, which expands the application scenarios of heat pump air conditioners.

An embodiment of the present invention further provides an electronic device, as shown in FIG. 5 , including a processor 51 , a communication interface 52 , a memory 53 and a communication bus 54 , wherein the processor 51 , the communication interface 52 , and the memory 53 pass through the communication bus 54 complete communication with each other,

memory 53 for storing computer programs;

The processor 51 is configured to implement the steps of the first aspect of the embodiment of the present invention when executing the program stored in the memory 53 .

The communication bus mentioned by the above terminal may be a Peripheral Component Interconnect (PCI for short) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA for short) bus or the like. The communication bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

The communication interface is used for communication between the above-mentioned terminal and other devices.

The memory may include random access memory (Random Access Memory, RAM for short), and may also include non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU for short), a network processor (NP for short), etc.; it may also be a digital signal processor (Digital Signal Processing, DSP for short) , Application Specific Integrated Circuit (ASIC for short), Field-Programmable Gate Array (FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

In yet another embodiment provided by the present invention, a computer-readable storage medium is also provided, where instructions are stored in the computer-readable storage medium, when the computer-readable storage medium is run on a computer, the computer is made to execute any one of the above-mentioned embodiments. The method for cooling a vehicle battery pack.

Based on the same inventive concept, as shown in FIG. 4 , an embodiment of the present application provides a vehicle, including a vehicle battery pack cooling system 2 , and the vehicle battery pack cooling system 2 is configured to execute the first aspect of the embodiment of the present invention. The steps of a vehicle battery pack cooling method.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

It should be understood by those skilled in the art that the embodiments of the embodiments of the present invention may be provided as a method, an apparatus, or a computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, CD-ROM, optical storage, and the like.

Embodiments of the present invention are described with reference to flowcharts and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the present invention. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing terminal equipment to produce a machine that causes the instructions to be executed by the processor of the computer or other programmable data processing terminal equipment Means are created for implementing the functions specified in the flow or flows of the flowcharts and/or the blocks or blocks of the block diagrams.

These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing terminal equipment to operate in a particular manner, such that the instructions stored in the computer readable memory result in an article of manufacture comprising instruction means, the The instruction means implement the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing terminal equipment, so that a series of operational steps are performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby executing on the computer or other programmable terminal equipment The instructions executed on the above provide steps for implementing the functions specified in the flowchart or blocks and/or the block or blocks of the block diagrams.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. "And/or" means that either one of the two can be selected, or both can be selected. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or terminal device comprising a list of elements includes not only those elements, but also a non-exclusive list of elements. other elements, or also include elements inherent to such a process, method, article or terminal equipment. Without further limitation, an element defined by the phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.

A vehicle battery pack cooling method, system and vehicle provided by the present invention have been described in detail above. Specific examples are used in this paper to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help Understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification does not It should be understood as a limitation of the present invention.

Claims (10)

1. A vehicle battery pack cooling method, the method comprising:

acquiring the temperature of a battery core of a vehicle battery pack and the temperature of cooling liquid;

if the highest temperature of the battery cell of the battery pack is within a first battery cell temperature range and the temperature of the cooling liquid meets the working temperature condition of first-stage passive cooling, performing first-stage passive cooling on the battery pack; the first battery core temperature interval is located in an optimal working temperature interval of the battery pack, or is the same as the optimal working temperature interval of the battery pack;

if the highest temperature of the battery cell of the battery pack is within a second battery cell temperature range and the temperature of the cooling liquid meets the working temperature condition of the second-stage passive cooling, performing second-stage passive cooling on the battery pack;

if the highest temperature of the battery cell of the battery pack is within the second cell temperature range and the temperature of the cooling liquid does not meet the working temperature condition of the second-stage passive cooling, performing active cooling;

wherein the minimum value of the second cell temperature interval is greater than the maximum value of the first cell temperature interval.

2. The method of claim 1, wherein vehicle operating conditions are obtained, wherein the vehicle operating conditions comprise a driving operating condition and a quick-charging operating condition;

if the highest temperature of the battery core of the battery pack is within a first battery core temperature range and the temperature of the cooling liquid meets the working temperature condition of first-stage passive cooling, the step of performing first-stage passive cooling on the battery pack comprises the following steps:

if the vehicle working condition is a driving working condition and the temperature of the cooling liquid is lower than a first execution temperature of the cooling liquid, passively cooling the battery pack until the highest temperature of the battery core of the battery pack is lower than a first exit condition temperature of the driving working condition; or the temperature of the cooling liquid is higher than the first termination temperature of the cooling liquid;

if the vehicle working condition is a quick charging working condition and the temperature of the cooling liquid is lower than a second execution temperature of the cooling liquid, passively cooling the battery pack until the highest temperature of the battery core of the battery pack is lower than a first exit condition temperature of the quick charging working condition; or the cooling liquid temperature is higher than the cooling liquid second termination temperature.

3. The method of claim 2, wherein the performing the second stage passive cooling step on the battery pack if the highest cell temperature of the battery pack is within the second cell temperature interval and the coolant temperature meets the operating temperature condition of the second stage passive cooling comprises:

if the vehicle working condition is a driving working condition and the temperature of the cooling liquid is lower than a first execution temperature of the cooling liquid, passively cooling the battery pack until the highest temperature of the battery cell of the battery pack is lower than a second exit condition temperature of the driving working condition, the highest temperature of the battery cell of the battery pack is located in a third battery cell temperature area or the temperature of the cooling liquid is higher than a first termination temperature of the cooling liquid;

if the vehicle working condition is a quick charging working condition and the temperature of the cooling liquid is lower than a second execution temperature of the cooling liquid, passively cooling the battery pack until the highest temperature of the battery cell of the battery pack is lower than a second exit condition temperature of the quick charging working condition, the highest temperature of the battery cell of the battery pack is located in a fourth battery cell temperature area or the temperature of the cooling liquid is higher than a second termination temperature of the cooling liquid;

and the minimum value of the third cell temperature interval is greater than the minimum value of the fourth cell temperature interval, and the minimum value of the fourth cell temperature interval is greater than the maximum value of the second cell temperature interval.

4. The method of claim 1, wherein if the maximum cell temperature of the battery pack is within a second cell temperature range and the coolant temperature does not satisfy the operating temperature condition for the second stage passive cooling, performing the active cooling step comprises:

and if the highest temperature of the battery pack core is within the second core temperature range and the temperature of the cooling liquid does not meet the working temperature condition of the second-stage passive cooling, starting an active cooling mode, and cooling the battery pack core through an air conditioning system.

5. A vehicle battery pack cooling system for passively cooling a battery pack, the system comprising:

radiator branch road, battery package branch road, actuating system branch road, air conditioner branch road, coolant liquid make-and-break valve and controller, wherein:

the first ends of the radiator branch, the battery pack branch, the driving system branch and the air conditioner branch are respectively connected with the cooling liquid on-off valve, and the second ends of the radiator branch, the battery pack branch, the driving system branch and the air conditioner branch are connected with each other, wherein a battery pack is arranged on the battery pack branch;

the controller is used for controlling the conduction of different pipelines of the cooling liquid on-off valve so as to realize the method of any one of claims 1 to 4.

6. The system of claim 5, further comprising a first branch connecting the second end of the heat sink branch to the coolant on-off valve, and a second branch connecting the second end of the battery pack branch to the coolant on-off valve, wherein when the first stage passive cooling and the second stage passive cooling are performed on the battery pack, the controller controls the coolant on-off valve to communicate the second end of the heat sink branch with the first end of the battery pack branch, and the second end of the battery pack branch with the first end of the heat sink branch.

7. The system of claim 5, wherein the controller controls the coolant on-off valve to conduct the first end of the air conditioning branch and the first end of the battery pack branch when active cooling is performed on the battery pack.

8. The system of claim 5, wherein the drive system branch comprises: overflow irritates and drive bridge, wherein:

one end of the overflow tank is a second end of the driving system branch;

the other end of the overflow tank is connected with one end of the driving bridge;

the other end of the drive bridge is a first end of the drive system branch.

9. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;

a memory for storing a computer program;

a processor for implementing the method steps of any one of claims 1 to 4 when executing a program stored in the memory.

10. A vehicle characterized in that it comprises at least a vehicle battery pack cooling system according to any one of claims 5-8.

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