CN111326806A - Battery management system and vehicle - Google Patents

Abstract

The invention discloses a battery management system and a vehicle, comprising: the battery module comprises N battery modules, wherein the N battery modules are connected in series, and each battery module is connected with a first electric control switch in parallel, wherein N is greater than or equal to 2; each battery module is correspondingly provided with a sub-battery management system, and each sub-battery management system comprises a controller; the controller is used for controlling the first electric control switch to be switched on or switched off; the overall battery management system comprises a signal processing module and a high-voltage connecting device, the signal processing module sends out a control signal based on the voltage of a first end and a second end of the high-voltage connecting device to control the high-voltage connecting device to be switched on or switched off. The technical scheme provided by the embodiment of the invention solves the problem of management confusion of the battery management system and ensures that a stable and safe power supply is provided for the electric automobile.

Description

A battery management system and a vehicle

technical field

Embodiments of the present invention relate to the technical field of batteries, and in particular, to a battery management system and a vehicle.

Background technique

When applied to an electric vehicle, it includes a plurality of battery modules, wherein each battery module is assembled from a plurality of single cells.

In the prior art, a battery management system controls a plurality of battery modules, and the management system is chaotic and cannot guarantee a stable and safe power supply for electric vehicles. Exemplarily, when one or several battery modules are abnormal, the battery management system for controlling multiple battery modules may fail to operate, so that the electric vehicle cannot continue to provide power. Or when the voltages provided by multiple battery modules do not meet the preset voltage required by the electric vehicle, they continue to provide power for the electric vehicle, resulting in a potential safety hazard for the electric vehicle.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention provide a battery management system and a vehicle to solve the technical problem that the management system of the battery management system is chaotic and cannot guarantee a stable and safe power supply for electric vehicles.

In a first aspect, an embodiment of the present invention provides a battery management system, including:

It includes N battery modules, the N battery modules are connected in series, and each of the battery modules is connected in parallel with a first electronically controlled switch, wherein N is greater than or equal to 2;

Each of the battery modules is correspondingly provided with a sub-battery management system, and the sub-battery management system includes a controller; the first control signal output end of the controller is electrically connected to the control end of the first electronic control switch, for controlling the first electronically controlled switch to be turned on or off;

An overall battery management system, the overall battery management system includes a signal processing module and a high voltage connection device, a first end of the high voltage connection device is electrically connected to the first end of the signal processing module, and a second end of the high voltage connection device is electrically connected The terminal is electrically connected to the second input terminal of the signal processing module, the first terminal of the high voltage connection device is electrically connected to the first pole of the series power supply of the N battery modules, the second terminal of the high voltage connection device is electrically connected The terminal is electrically connected to the second pole of the series power supply of the N battery modules, the third terminal of the high-voltage connection device and the fourth terminal of the high-voltage connection device are electrically connected to the load, and the output of the signal processing module The terminal is electrically connected to the fifth terminal of the high-voltage connection device, and the signal processing module sends a control signal based on the voltage of the first terminal and the second terminal of the high-voltage connection device to control the high-voltage connection device to be turned on or off.

Optionally, the sub-battery management system further includes a battery parameter detection unit, which is arranged inside the correspondingly set battery module and used to detect the output voltage, output current and working temperature of the correspondingly set battery module;

The first signal input end of the controller is electrically connected to the output end of the battery parameter detection unit, and based on the correspondingly set output voltage, output current and operating temperature of the battery module, the correspondingly set battery module The output voltage, output current and operating temperature of the controller are all equal to preset values, the first control signal output terminal of the controller sends a cut-off control signal, and the first electronically controlled switch is in the cut-off state based on the on-control signal; or , any one of the output voltage, output current and operating temperature of the battery module set correspondingly is equal to the preset value, the first control signal output end of the controller sends out a conduction control signal, and the first power The control switch is in a conducting state based on the conducting control signal.

Optionally, it also includes a second electric control switch, the first pole of each battery module is electrically connected to the first end of the second electric control switch, and the second end of the second electric control switch is electrically connected to the second electric control switch. the first end of the first electronically controlled switch is electrically connected;

The second control signal output end of the controller is electrically connected to the control end of the second electronically controlled switch, and is used to control the second electronically controlled switch to be turned on or off.

Optionally, the sub-battery management system further includes a safety information detection unit for detecting one or more of ambient temperature, pressure and gas concentration;

The second signal input end of the controller is electrically connected to the output end of the safety information detection unit, and based on one or more of the ambient temperature, ambient pressure and gas concentration, the ambient temperature, pressure and gas concentration One or more of the concentrations are equal to the preset value, the second control signal output terminal of the controller sends out a conduction control signal, and the second electronically controlled switch is in a conduction state based on the conduction control signal; Or, if any one of the ambient temperature, ambient pressure and gas concentration is not equal to the preset value, the second control signal output end of the controller sends a cut-off control signal, and the second electronically controlled switch is based on the cut-off The control signal is in the off state.

Optionally, the sub-battery management system further includes a communication module, and the signal processing module is communicatively connected to the communication module of each sub-battery management system through a bus.

Optionally, the communication module is connected in communication with the communication interface of the controller, and the controller is based on the correspondingly set working temperature of the battery module, and the correspondingly set working temperature of the battery module is greater than a preset value. value, send out a cooling control signal, or send out a heating control signal when the correspondingly set operating temperature of the battery module is lower than the preset value;

The sub-battery management system further includes a thermal management device, a communication interface of the thermal management device is communicatively connected to the communication module, and cools the battery module based on the cooling control signal, or, based on the heating control signal , heating the battery module.

Optionally, the sub-battery management system further includes a self-unloading device, the control terminal of the self-unloading device is electrically connected to the third control signal output terminal of the controller, and the output voltage of the battery module is set correspondingly. , any one of the output current and the working temperature is not equal to the preset value, the third control signal output terminal of the controller sends out a self-unloading control signal, and the self-unloading device unloads the self-unloading control signal based on the self-unloading control signal. battery module.

Optionally, the battery module includes M battery cells, and the M battery cells are arranged side by side in series, wherein M is greater than or equal to 1.

Optionally, an insulating layer is provided between two adjacent battery cells.

In a second aspect, an embodiment of the present invention provides a vehicle, including the battery management system described in any of the first aspect; and a vehicle control system, which is communicatively connected to a signal processing module included in the overall battery management system;

The series power supply of the N battery modules provides power for the electric motor of the vehicle and the vehicle control system.

In the above technical solution, each battery module is correspondingly provided with a sub-battery management system to realize the self-management and self-isolation of the battery module, so that when one or several battery modules are abnormal, it may cause the control of multiple battery modules. A situation in which the battery management system of the pack cannot operate so that it cannot continue to provide power to the electric vehicle. The overall battery management system realizes the monitoring and control of the voltage provided by the series power supply of N battery modules, realizes a stable and safe power supply for electric vehicles, and avoids the voltage provided by multiple battery modules does not meet the requirements of electric vehicles. When the preset voltage is required, it continues to provide power for the electric vehicle, which leads to the potential safety hazard of the electric vehicle, and solves the technical problem that the existing battery management system is chaotic and cannot guarantee a stable and safe power supply for the electric vehicle.

Description of drawings

FIG. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a sub-battery management system according to an embodiment of the present invention;

3 is a schematic structural diagram of a high-voltage connection device provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another seed battery management system provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another battery management system provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another sub-battery management system according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

FIG. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present invention, and FIG. 2 is a schematic structural diagram of a sub-battery management system according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 2 , the battery management system includes: including N battery modules 10 , the N battery modules 10 are formed in series, and each battery module 10 is connected in parallel with a first electronically controlled switch 11 , wherein each battery The first pole A1 of the module 10 is electrically connected to the first terminal B1 of the first electronically controlled switch 11 , the second pole A2 of each battery module 10 is electrically connected to the second terminal B2 of the first electrically controlled switch 11 , N greater than or equal to 2; each battery module 10 is correspondingly provided with a sub-battery management system BMS1, and the sub-battery management system BMS1 includes a controller 20; the first control signal output end C1 of the controller 20 is controlled by the first electronic control switch 11 The terminal B3 is electrically connected and is used to control the first electronically controlled switch 11 to be turned on or off; the overall battery management system BMS0, the overall battery management system BMS0 includes a signal processing module 30 and a high voltage connection device 40, the first end D1 of the high voltage connection device 40 It is electrically connected to the first input end E1 of the signal processing module 30, the second end D2 of the high voltage connection device 40 is electrically connected to the second input end E2 of the signal processing module 30, and the first end D1 of the high voltage connection device 40 is connected to N batteries The first pole F1 of the series power supply 100 of the module is electrically connected, the second terminal D2 of the high voltage connection device 40 is electrically connected to the second pole F2 of the series power supply 100 of the N battery modules, and the third terminal D3 of the high voltage connection device 40 is electrically connected The fourth end D4 of the high-voltage connection device 40 is electrically connected to the load 50 , the output end E3 of the signal processing module 30 is electrically connected to the fifth end D5 of the high-voltage connection device 40 , and the signal processing module 30 is based on the first end of the high-voltage connection device 40 . The voltage of D1 and the second terminal D2 sends out a control signal to control the high-voltage connection device 40 to be turned on or off.

In this embodiment, the load 50 may be a motor included in an electric vehicle and a control system of the electric vehicle.

Each battery module 10 is correspondingly provided with a sub-battery management system BMS1, and the sub-battery management system BMS1 includes a controller 20; the controller 20 is used to control the first electronically controlled switch 11 to be turned on or off. Exemplarily, all the controllers 20 control the correspondingly arranged first electronic control switches 11 to be turned off, and the voltage that can be provided by the series-connected power supply 100 of the N battery modules is the sum of the voltages of the N battery modules. If one of the controllers 20 controls the correspondingly disposed first electronic control switch 11 to be turned on, the voltage that the series-connected power supply 100 of N battery modules can provide is the sum of the voltages of (N−1) battery modules. To sum up, in the event that any one of the N battery modules 10 fails, the controller 20 can short-circuit the corresponding battery module 10 by controlling the first electronically controlled switch 11 to be turned on. The above technical solution avoids that a battery management system in the prior art controls multiple battery modules, but when one or several of the battery modules are abnormal, the battery management system that controls the multiple battery modules 10 may be unable to operate , so that it cannot continue to provide power for electric vehicles.

The overall battery management system BMS0 includes a signal processing module 30 and a high-voltage connection device 40. The voltages provided by the series power supplies 100 of N battery modules can be collected through the first input terminal E1 and the second input terminal E2 of the signal processing module 30. When the voltage provided by the series-connected power supply 100 of each battery module does not match the preset voltage required by the load 50, a control signal is sent to control the high-voltage connection device 40 to be turned off. When the voltage provided by the series power supply 100 of the N battery modules matches the preset voltage required by the load 50 , a control signal is sent to control the high-voltage connection device 40 to be turned on to provide power for the load 50 . The above technical solution realizes providing a stable and safe power supply for electric vehicles, and avoids that when the voltage provided by multiple battery modules does not meet the preset voltage required by the electric vehicle, the electric vehicle continues to provide power supply, resulting in potential safety hazards for the electric vehicle. Case.

The high-voltage connection device 40 is exemplified, and the relay KM can be selected. 3, the relay KM includes a coil L, the first end of the coil L is grounded, the second end is electrically connected to the collector of the triode T, the emitter of the triode T is electrically connected to the power supply VCC, and the base of the triode T serves as a high-voltage connection device 40 The fifth end D5 is electrically connected to the output end E3 of the signal processing module 30 , the first normally open contact K1a is used as the first end D1 of the high voltage connection device 40 , and the second normally open contact K1c is used as the second end of the high voltage connection device 40 . D2, the first common contact K1b serves as the third end D3 of the high-voltage connection device 40, and the second common contact K1d serves as the fourth end D4 of the high-voltage connection device 40. The signal processing module 30 sends a control signal based on the voltages of the first terminal D1 and the second terminal D2 of the high voltage connection device 40 to control the transistor T to be turned on or off. Specifically, the transistor T is turned on, the coil L is energized, the first normally open contact K1a and the first common contact K1b are closed, the second normally open contact K1c and the second common contact K1d are closed, and N battery modules The series power supply 100 provides power for the load 50 . The transistor T is turned off, the coil L is de-energized, the first normally open contact K1a and the first common contact K1b are disconnected, the second normally open contact K1c and the second common contact K1d are disconnected, and the series connection of N battery modules The power supply 100 stops supplying power to the load 50 .

To sum up, in the above technical solution, each battery module 10 is correspondingly provided with a sub-battery management system BMS1 to realize the self-management and self-isolation of the battery module 10, so as to avoid that when one or several battery modules are abnormal, the battery module 10 may become abnormal. A situation in which the battery management system that controls multiple battery modules cannot operate so that it cannot continue to provide power to the electric vehicle. The overall battery management system BMS0 realizes the monitoring and control of the voltage provided by the series power supply 100 of N battery modules, realizes providing a stable and safe power supply for electric vehicles, and avoids that the voltages provided by multiple battery modules do not meet the requirements of electric vehicles. When the preset voltage required by the car continues to provide power for the electric car, which leads to the potential safety hazard of the electric car, it solves the technical problem that the existing battery management system is relatively chaotic and cannot guarantee a stable and safe power supply for the electric car.

Each battery module 10 is correspondingly provided with a sub-battery management system BMS1, and the sub-battery management system BMS1 includes a controller 20; the controller 20 is used to control the first electronically controlled switch 11 to be turned on or off. The following further details the technical solution in which the controller 20 controls the first electronically controlled switch 11 to be turned on or off according to the correspondingly set output voltage, output current and operating temperature of the battery module 10 .

FIG. 4 is a schematic structural diagram of a sub-battery management system according to an embodiment of the present invention. Optionally, on the basis of the above technical solution, referring to FIG. 4 , the sub-battery management system BMS1 further includes a battery parameter detection unit 21, which is arranged inside the correspondingly set battery module and is used to detect the output of the correspondingly set battery module. voltage, output current and operating temperature; the first signal input terminal C2 of the controller 20 is electrically connected to the output terminal G1 of the battery parameter detection unit 21, and based on the correspondingly set output voltage, output current and operating temperature of the battery module 10, the corresponding The set output voltage, output current and operating temperature of the battery module 10 are all equal to the preset values, the first control signal output terminal C1 of the controller 20 sends a cut-off control signal, and the first electronically controlled switch 11 is in the cut-off state based on the cut-off control signal ; Or, if any one of the output voltage, output current and operating temperature of the battery module 10 set correspondingly is not equal to the preset value, the first control signal output terminal C1 of the controller 20 sends a conduction control signal, and the first electronic control The switch 11 is in an ON state based on the ON control signal.

Specifically, the correspondingly set output voltage, output current and operating temperature of the battery module 10 are all equal to the preset values, the first control signal output terminal C1 of the controller 20 sends a cut-off control signal, and the first electronically controlled switch 11 is based on the cut-off control When the signal is in an off state, the battery module 10 can provide a power supply voltage to the load 50 . Any one of the correspondingly set output voltage, output current and operating temperature of the battery module 10 is not equal to the preset value, the first control signal output terminal C1 of the controller 20 sends a conduction control signal, and the first electronically controlled switch 11 is based on The conduction control signal is in the conduction state, that is, the controller 20 short-circuits the corresponding battery module 10 . In the above technical solution, each battery module 10 is correspondingly provided with a sub-battery management system BMS1 to realize the self-management and self-isolation of the battery module 10, and to avoid the output voltage, output current and working temperature of one or more of the battery modules. When any one of the values is not equal to the preset value, it may make the battery management system that controls multiple battery modules unable to operate, so that it cannot continue to provide power for the electric vehicle.

In the event that any one of the N battery modules 10 fails, the controller 20 can short-circuit the corresponding battery module 10 by controlling the first electronically controlled switch 11 to be turned on. That is, the first pole A1 of each battery module 10 is electrically connected to the first terminal B1 of the first electronically controlled switch 11 , and the second pole A2 of each battery module 10 is electrically connected to the second terminal B2 of the first electronically controlled switch 11 . When electrically connected, at this time, there is no load in the circuit, and the battery module 10 will quickly heat up, causing a great safety hazard. In the following further details, the controller 20 avoids the occurrence of the above situation by controlling the second electronically controlled switch 12 .

FIG. 5 is a schematic structural diagram of another battery management system provided by an embodiment of the present invention, and FIG. 6 is a schematic structural diagram of another sub-battery management system provided by an embodiment of the present invention. Referring to FIG. 5 and FIG. 6 , the battery management system further includes a second electric control switch 12 , the first pole A1 of each battery module 10 is electrically connected to the first end B4 of the second electric control switch 12 , and the second electric control switch 12 is The second terminal B5 of the switch 12 is electrically connected to the first terminal B1 of the first electronically controlled switch 11 ; the second control signal output terminal C3 of the controller 20 is electrically connected to the control terminal B6 of the second electronically controlled switch 12 for controlling The second electronically controlled switch 12 is turned on or off.

Specifically, each battery module 10 is correspondingly provided with a sub-battery management system BMS1, and the sub-battery management system BMS1 includes a controller 20; the controller 20 controls the first battery module according to the correspondingly set output voltage, output current and working temperature of the battery module An electronically controlled switch 11 is turned on or off. Exemplarily, if any one of the correspondingly set output voltage, output current and operating temperature of the battery module 10 is not equal to the preset value, the controller 20 controls the first electronically controlled switch 11 to be turned on, that is, the controller 20 turns the corresponding The battery modules 10 are short-circuited, and the voltage that can be provided by the series-connected power supplies 100 of N battery modules is the sum of the voltages of (N-1) battery modules. At this time, the second control signal output terminal C3 of the controller 20 is electrically connected to the control terminal B6 of the second electronically controlled switch 12 to control the second electronically controlled switch 12 to be turned off, which can avoid the first pole A1 of each battery module 10 It is electrically connected to the first terminal B1 of the first electronically controlled switch 11, and the second pole A2 of each battery module 10 is electrically connected to the second terminal B2 of the first electronically controlled switch 11. There is no load in the circuit, and the battery module 10 It will quickly heat up, causing technical problems of potential safety hazards. Exemplarily, the output voltage, output current and operating temperature of the battery modules 10 are all equal to the preset values, all the controllers 20 control the correspondingly set first electronic control switches 11 to turn off, and the series power supply 100 of the N battery modules can provide The voltage of is the sum of the voltages of N battery modules. If a battery module 10 is abnormal at this time, the controller 20 can also control the second electronic control switch 12 to be turned off to ensure a stable and safe power supply for the electric vehicle.

Optionally, on the basis of the above technical solution, the controller 20 is further refined to control the second electronically controlled switch 12 to turn on or to control the second electronically controlled switch 12 according to one or more of the ambient temperature, pressure and gas concentration where the battery module 10 is located. deadline to ensure a stable and safe power supply for electric vehicles.

Referring to FIG. 6 , the sub-battery management system BMS1 further includes a safety information detection unit 22 for detecting one or more of ambient temperature, pressure and gas concentration; the second signal input terminal C4 of the controller 20 and the safety information detection unit The output terminal H1 of 22 is electrically connected, and based on one or more of ambient temperature, ambient pressure and gas concentration, one or more of ambient temperature, pressure and gas concentration are all equal to the preset value, and the No. The second control signal output terminal C3 sends out a conduction control signal, and the second electronically controlled switch 12 is in the conduction state based on the conduction control signal; The second control signal output terminal C3 of the controller 20 sends a cut-off control signal, and the second electronically controlled switch 12 is in the cut-off state based on the cut-off control signal.

Specifically, the controller 20 controls the first electronically controlled switch 11 to be turned on or off according to the correspondingly set output voltage, output current and operating temperature of the battery module. Exemplarily, the output voltage, output current and operating temperature of the battery modules 10 are all equal to the preset values, all the controllers 20 control the correspondingly set first electronic control switches 11 to turn off, and the series power supply 100 of the N battery modules can provide The voltage of is the sum of the voltages of N battery modules. One or more of the ambient temperature, pressure and gas concentration are all equal to the preset value, the second control signal output terminal C3 of the controller 20 sends a conduction control signal, and the second electronically controlled switch 12 is in conduction based on the conduction control signal. pass status. If any one of ambient temperature, ambient pressure and gas concentration is not equal to the preset value, the second control signal output terminal C3 of the controller 20 sends a cut-off control signal, and the second electronically controlled switch 12 is in the cut-off state based on the cut-off control signal.

Exemplarily, if any one of the correspondingly set output voltage, output current and operating temperature of the battery module 10 is not equal to the preset value, the controller 20 controls the first electronically controlled switch 11 to be turned on, that is, the controller 20 turns the corresponding The battery modules 10 are short-circuited, and the voltage that can be provided by the series-connected power supplies 100 of N battery modules is the sum of the voltages of (N-1) battery modules. At this time, the first pole A1 of each battery module 10 is electrically connected to the first terminal B1 of the first electronically controlled switch 11 , and the second pole A2 of each battery module 10 is electrically connected to the second terminal B1 of the first electronically controlled switch 11 . The terminal B2 is electrically connected. At this time, there is no load in the circuit, the battery module 10 will heat up rapidly, and the ambient temperature is not equal to the preset value. The second control signal output terminal C3 of the controller 20 sends a cutoff control signal, and the second electronic The switch 12 is in an off state based on the off control signal.

Optionally, on the basis of the above technical solutions, the sub-battery management system BMS1 further includes a communication module 23, and the signal processing module 30 is communicatively connected to the communication module 23 of each sub-battery management system BMS1 through a bus.

The sub-battery management system BMS1 corresponding to each battery module 10 is connected in communication with the overall battery management system BM0. The overall battery management system BMS0 can obtain the status of each battery module 10, such as the output voltage, output current and The working temperature and the ambient temperature, pressure and gas concentration of the battery module 10 are controlled by the controller 20 in the sub-battery management system BMS1 to control the first electronically controlled switch 11 and the second electronically controlled switch 12 .

Optionally, on the basis of the above technical solution, the communication module 23 is communicatively connected with the communication interface of the controller 20, and the controller 20 sets the correspondingly set operating temperature of the battery module 10 based on the correspondingly set operating temperature of the battery module. When the working temperature of 10 is greater than the preset value, a cooling control signal is sent, or, if the correspondingly set working temperature of the battery module is less than the preset value, a heating control signal is sent; The communication interface of the management device 24 is connected in communication with the communication module 23, and cools the battery module based on the cooling control signal, or heats the battery module based on the heating control signal.

The working temperature of the battery module 10 is not equal to the preset value, which will cause the battery module 10 to not work normally. By default, the battery module is heated to ensure that the battery module 10 can work normally.

Optionally, on the basis of the above technical solution, the sub-battery management system further includes a self-unloading device 25, and the control end of the self-unloading device 25 is electrically connected to the third control signal output end C5 of the controller 20, and the corresponding battery model is set. Any one of the output voltage, output current and operating temperature of the group 10 is not equal to the preset value, the third control signal output terminal C5 of the controller sends out a self-unloading control signal, and the self-unloading device 25 unloads the battery module based on the self-unloading control signal. The group 10 is convenient for the user to remove the battery module 10 and repair it.

Optionally, based on the above technical solution, the battery module 10 includes M battery cells, and the M battery cells are arranged side by side in series, where M is greater than or equal to 1. The battery module 10 includes M battery cells connected in series, which increases the voltage of the battery module 10 .

Optionally, an insulating layer is provided between two adjacent battery cells, which can prevent two adjacent battery cells from forming conductive contact through their respective casings.

Based on the same inventive concept, an embodiment of the present invention also provides a vehicle, which includes any one of the battery management systems in the above technical solutions; and also includes a vehicle control system, which is communicatively connected to the signal processing module 30 included in the overall battery management system BMSO ; The series power supply 100 of the N battery modules provides power for the motor of the vehicle and the vehicle control system.

The vehicle provided by the embodiment of the present invention includes the battery management system in the above technical solution. In the above technical solution, each battery module 10 is correspondingly provided with a sub-battery management system BMS1 to realize the self-management and self-isolation of the battery module 10 and avoid When one or more of the battery modules are abnormal, the battery management system that controls the plurality of battery modules may fail to operate, so that the electric vehicle cannot continue to provide power. The overall battery management system BMS0 realizes the monitoring and control of the voltage provided by the series power supply 100 of N battery modules, realizes providing a stable and safe power supply for electric vehicles, and avoids that the voltages provided by multiple battery modules do not meet the requirements of electric vehicles. When the preset voltage required by the car continues to provide power for the electric car, which leads to the potential safety hazard of the electric car, it solves the technical problem that the existing battery management system is relatively chaotic and cannot guarantee a stable and safe power supply for the electric car.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. A battery management system, comprising: It includes N battery modules, the N battery modules are connected in series, and each of the battery modules is connected in parallel with a first electronically controlled switch, wherein N is greater than or equal to 2; Each of the battery modules is correspondingly provided with a sub-battery management system, and the sub-battery management system includes a controller; the first control signal output end of the controller is electrically connected to the control end of the first electronic control switch, for controlling the first electronically controlled switch to be turned on or off; An overall battery management system, the overall battery management system includes a signal processing module and a high voltage connection device, a first end of the high voltage connection device is electrically connected to the first end of the signal processing module, and a second end of the high voltage connection device is electrically connected The terminal is electrically connected to the second input terminal of the signal processing module, the first terminal of the high voltage connection device is electrically connected to the first pole of the series power supply of the N battery modules, the second terminal of the high voltage connection device is electrically connected The terminal is electrically connected to the second pole of the series power supply of the N battery modules, the third terminal of the high-voltage connection device and the fourth terminal of the high-voltage connection device are electrically connected to the load, and the output of the signal processing module The terminal is electrically connected to the fifth terminal of the high-voltage connection device, and the signal processing module sends a control signal based on the voltage of the first terminal and the second terminal of the high-voltage connection device to control the high-voltage connection device to be turned on or off. 2 . The battery management system according to claim 1 , wherein the sub-battery management system further comprises a battery parameter detection unit, which is arranged inside the correspondingly set battery module and is used to detect the correspondingly set battery module. 3 . The output voltage, output current and operating temperature of the battery module; The first signal input end of the controller is electrically connected to the output end of the battery parameter detection unit, and based on the relationship between the output voltage, output current and working temperature of the battery module set correspondingly and the preset value, a signal is sent out. Turn off control signal or turn on control signal; The first electronically controlled switch is in an off state based on the off control signal; or, the first electronically controlled switch is in an on state based on the on control signal. 3 . The battery management system according to claim 1 , further comprising a second electronically controlled switch, and the first pole of each of the battery modules is electrically connected to the first end of the second electronically controlled switch. 4 . , the second end of the second electronically controlled switch is electrically connected to the first end of the first electronically controlled switch; The second control signal output end of the controller is electrically connected to the control end of the second electronically controlled switch, and is used to control the second electronically controlled switch to be turned on or off. 4. The battery management system according to claim 3, wherein the sub-battery management system further comprises a safety information detection unit for detecting one or more of ambient temperature, pressure and gas concentration; The second signal input end of the controller is electrically connected to the output end of the safety information detection unit, and based on the relationship between one or more of the ambient temperature, ambient pressure and gas concentration and the preset value, the signal is sent out. The turn-on control signal or the turn-off control signal; the second electronically controlled switch is in the turn-on state based on the turn-on control signal; or the second electronically controlled switch is turned off based on the turn-off control signal. 5 . The battery management system according to claim 2 , wherein the sub-battery management system further comprises a communication module, and the signal processing module is communicatively connected to the communication module of each sub-battery management system through a bus. 6 . 6 . The battery management system according to claim 5 , wherein the communication module is communicatively connected to a communication interface of the controller, and the controller is based on the correspondingly set operating temperature and preset temperature of the battery module. 7 . Depending on the size of the set value, a cooling control signal or a heating control signal is sent; The sub-battery management system further includes a thermal management device, a communication interface of the thermal management device is communicatively connected to the communication module, and cools the battery module based on the cooling control signal, or, based on the heating control signal , heating the battery module. 7. The battery management system according to claim 2, wherein, The sub-battery management system further includes a self-unloading device, the control end of the self-unloading device is electrically connected to the third control signal output end of the controller, and the output voltage, output current and If any one of the working temperatures is not equal to the preset value, the third control signal output terminal of the controller sends out a self-unloading control signal, and the self-unloading device unloads the battery module based on the self-unloading control signal. 8 . The battery management system according to claim 1 , wherein the battery module comprises M battery cells, and the M battery cells are arranged side by side in series, wherein M is greater than or equal to 1. 9 . 9 . The battery management system according to claim 8 , wherein an insulating layer is provided between two adjacent battery cells. 10 . 10. A vehicle, characterized by comprising the battery management system according to any one of claims 1-9; further comprising a vehicle control system, connected in communication with a signal processing module included in the overall battery management system; The series power supply of the N battery modules provides power for the electric motor of the vehicle and the vehicle control system.

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