WO2022143624A1 - Battery management system and method, vehicle and storage medium - Google Patents

Abstract

A battery management system, comprising a first power equalization circuit (110), a second power equalization circuit (120), a power battery (130) and an acquisition unit (140); the first power equalization circuit (110), the second power equalization circuit (120) and the power battery (130) are respectively connected to the acquisition unit (140), and the first power equalization circuit (110) and the second power equalization circuit (120) are respectively connected to the power battery (130); wherein the power battery (130) is configured to provide electric energy for the first power equalization circuit (110) and the second power equalization circuit (120); the first power equalization circuit (110) is configured to start the first power equalization circuit (110) in response to the current temperature of the power battery (130) being less than a first preset threshold; and the second power equalization circuit (120) is configured to start the second power equalization circuit (120) in response to the current temperature of the power battery (130) being greater than the first preset threshold. Also disclosed are a battery management method, a vehicle and a storage medium which contains computer-executable instructions. The battery management system solves the problems in the related art that an equalization time is prolonged due to an increase in resistance temperature in a passive equalization solution of a battery equalization system, and charging cannot be performed when the temperature of the power battery (130) is low, thereby adjusting the equalization power according to a real-time battery temperature state, shortening the equalization time, and improving the safety of equalization circuits.

Description

Battery management system, method, vehicle and storage medium

This application claims the priority of the Chinese patent application with application number 202011582324.2 filed with the China Patent Office on December 28, 2020, the entire contents of the above application are incorporated into this application by reference.

technical field

The embodiments of the present application relate to computer technology, for example, to a battery management system, method, vehicle, and storage medium.

Background technique

The new energy vehicle power battery pack is composed of multiple lithium-ion power batteries in series and parallel. The consistency of the power battery packs used for a long time is poor, resulting in voltage imbalance between multiple lithium-ion power batteries. The problem of voltage imbalance between multiple lithium-ion power batteries in the power battery pack will lead to problems such as the reduction of the service life of the power battery of the vehicle and the shortening of the driving mileage of the vehicle.

SUMMARY OF THE INVENTION

Embodiments of the present application disclose a battery management system, method, vehicle, and storage medium.

In a first aspect, an embodiment of the present application provides a battery management system, where the battery management system includes: a first power balance circuit, a second power balance circuit, a power battery, and a collection unit;

Wherein, the first power balance circuit, the second power balance circuit and the power battery are respectively connected to the acquisition unit, and the first power balance circuit and the second power balance circuit are respectively connected to the power battery ;

the power battery is configured to provide electrical energy for the first power equalization circuit and the second power equalization circuit;

The collection unit is configured to collect the current temperature and current voltage of the power battery;

the first power balancing circuit, configured to turn on the first power balancing circuit in response to the current temperature of the power battery being less than a first preset threshold;

The second power balancing circuit is configured to turn on the second power balancing circuit in response to the current temperature of the power battery being greater than a first preset threshold.

In a second aspect, the embodiments of the present application further provide a battery management method, which is executed by any one of the battery management systems, and the method includes:

Collect the current temperature and current voltage of the power battery;

Turning on the first power balancing circuit in response to the current temperature of the power battery being less than a first preset threshold;

According to the power battery voltage and the current voltage in the first power balancing circuit, the operating status of the first power balancing circuit is determined.

In a third aspect, an embodiment of the present application also provides a vehicle, the vehicle comprising:

one or more processors;

storage means arranged to store one or more programs,

When the one or more programs are executed by the one or more processors, the one or more processors implement any one of the battery management systems.

In a fourth aspect, embodiments of the present application further provide a storage medium containing computer-executable instructions, where the computer-executable instructions are used to execute any one of the battery management systems when executed by a computer processor.

In a fifth aspect, an embodiment of the present application further provides a vehicle, the vehicle comprising:

one or more processors;

storage means arranged to store one or more programs,

When the one or more programs are executed by the one or more processors, the one or more processors implement any one of the battery management methods.

In a sixth aspect, the embodiments of the present application further provide a storage medium containing computer-executable instructions, where the computer-executable instructions are used to execute any one of the battery management methods when executed by a computer processor.

Description of drawings

1 is a schematic structural diagram of a battery management system in Embodiment 1 of the present application;

1A is a schematic circuit diagram of a battery management system in Embodiment 1 of the present application;

FIG. 1B is an execution flowchart of a battery management system in Embodiment 1 of the present application;

2 is a flowchart of a battery management method in Embodiment 2 of the present application;

FIG. 3 is a schematic structural diagram of a vehicle in Embodiment 3 of the present application.

Detailed ways

The new energy electric vehicles in the related art are equipped with a battery balancing system, but due to cost constraints, the battery balancing system adopts a passive balancing scheme, which uses a power program-controlled switch to control the balancing resistor to connect to the positive and negative electrodes of the battery, so as to consume high-voltage batteries through resistance discharge. The energy of the lithium-ion power battery will generate heat in the process of consuming energy by the resistance. With the increase of the resistance temperature, the balancing power will become smaller and the balancing time will be prolonged. At the same time, when the battery temperature is low, charging cannot be performed, and the battery needs to be heated before charging. In addition, when the power range air switch fails, the discharge of the resistance to the battery is uncontrollable, which may worsen the imbalance of the battery and cause the battery to be completely damaged.

To cope with the above situation, embodiments of the present application disclose a battery management system, method, vehicle, and storage medium.

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

Example 1

FIG. 1 is a schematic structural diagram of a battery management system according to Embodiment 1 of the present application. As shown in FIG. 1 , the battery management system includes: a first power balance circuit 110 , a second power balance circuit 120 , and a power battery 130 and a collection unit 140; wherein the first power balance circuit 110, the second power balance circuit 120 and the power battery 130 are respectively connected to the collection unit 140, the first power balance circuit 110 and the The two power equalization circuits 120 are respectively connected to the power battery 130; the power battery 130 is configured to provide electrical energy for the first power equalization circuit 110 and the second power equalization circuit 120; the collection unit 140 is configured to collect the the current temperature and current voltage of the power battery; the first power balancing circuit 110 is configured to turn on the first power balancing circuit in response to the current temperature of the power battery being less than a first preset threshold; the second power balancing circuit The power balance circuit 120 is configured to turn on the second power balance circuit in response to the current temperature of the power battery being greater than a first preset threshold.

In the embodiments of the present application, the first power balancing circuit can be understood as a circuit loop formed by at least one circuit element in a connection manner, which is used to provide high-power heat for the power battery; the second power balancing circuit can be understood as at least one circuit element A circuit loop formed in a connection mode is used to provide balanced current for the power battery. The collection unit can be understood as a functional unit capable of collecting various parameters in the battery management system, and controls each unit to cooperate with each other according to preset thresholds of various parameters. The power battery can be understood as a battery with a higher battery voltage selected in the power battery pack. The first preset threshold can be understood as the temperature of the corresponding power battery when the first power balancing circuit is turned off.

In the embodiment of the present application, the first power balancing circuit and the second power balancing circuit in the battery management system are different circuits in one balancing circuit in the battery management system. When the equalization circuit is turned on, the power battery provides electrical energy for the first power equalization circuit or the second power equalization circuit. A plurality of temperature sensors are arranged in the first power equalization circuit and the second power equalization circuit to facilitate the collection of the current temperature of the power battery. After the first power equalization circuit and the second power equalization circuit in the battery management system open the equalization circuit for the battery management system, the different circuits selected to be opened according to the current temperature of the power battery are all used for the power battery in the charging state of the power battery. balanced. When the collecting unit collects that the current temperature of the power battery is less than the first preset threshold, it means that the first power balancing circuit can be activated to perform high-power balancing to generate heat to provide heat for the power battery.

In one embodiment, the collection unit 140 is a battery temperature sensor RT1, a balance circuit temperature sensor RT2, and a battery management system temperature sensor RT3.

In one embodiment, the first power balancing circuit includes: a second resistor R2, a third resistor R3, a first MOS transistor Q1, a redundant switch K1 and a battery temperature sensor RT1;

One end of the second resistor R2 is connected to the positive electrode of the power battery, the other end of the second resistor R2 is connected to the S pole (source) of the first MOS transistor Q1, and the D pole (drain) of the first MOS transistor Q1 pole) is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the redundant switch K1, and the other end of the redundant switch K1 is connected to the negative electrode of the power battery, The load extension line of the redundant switch K1 is connected with the acquisition unit;

The second resistor R2 and the third resistor R3 are used to form the current of the first power balance circuit;

The first MOS transistor Q1 is used to form a loop of the first power equalization circuit;

the redundant switch K1 is used to protect the first power balancing circuit;

The battery temperature sensor RT1 is used to collect the current temperature of the power battery.

In the embodiment of the present application, the second resistor R2 and the third resistor R3 can be understood as the on-resistance when the first power balancing circuit is selected when the balancing circuit in the battery management system is turned on. The first MOS transistor Q1 can be understood as a MOS transistor that is turned off in the circuit when the first power balancing circuit is selected when the balancing circuit in the battery management system is turned on. The redundant switch K1 can be understood as a switch for turning on or off the balancing circuit in the battery management system. When the power battery selects the first power balancing circuit, the redundant switch K1 is in the off state.

In the embodiment of the present application, when the current temperature of the power battery collected by the collection unit in the battery management system is lower than the first preset threshold, the redundant switch K1 and the first MOS transistor Q1 are turned off, so that the second resistor R2 and the third resistor R3 are turned off. It is connected in series, and forms a first power equalization circuit with the power battery for high power equalization. The resistance values of the second resistor R2 and the third resistor R3 in the first power balancing circuit are relatively small, so that the current in the first power balancing circuit is relatively large, and when the current is large, the power of the first power balancing circuit is relatively large, which can generate heat for supplying heat. Use the power battery to avoid charging when the temperature of the power battery is too low.

In one embodiment, the second power balancing circuit includes: a first resistor R1, a fourth resistor R4, a second MOS transistor Q2, a redundant switch K1 and a battery temperature sensor RT1;

One end of the first resistor R1 is connected to the positive pole of the power battery, the other end of the first resistor R1 is connected to the S pole of the second MOS transistor Q2, and the D pole of the first MOS transistor Q1 is connected to the fourth resistor One end of R4 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the redundant switch K1, the other end of the redundant switch K1 is connected to the negative electrode of the power battery, and the other end of the redundant switch K1 is connected to the negative electrode of the power battery. The load extension line is connected with the acquisition unit;

the first resistor R1 and the fourth resistor R4 are used to form the current of the second power balance circuit;

The second MOS transistor Q2 is used to form a loop of the second power equalization circuit;

the redundant switch K1 is used to protect the second power balance circuit;

Wherein, the first resistor R1 is greater than the second resistor R2, and the fourth resistor R4 is greater than the third resistor R3.

In the embodiment of the present application, the first resistor R1 and the fourth resistor R4 can be understood as the resistances that are turned on when the second power balancing circuit is selected when the balancing circuit in the battery management system is turned on. The second MOS transistor Q2 can be understood as a MOS transistor that is turned off in the circuit when the second power balancing circuit is selected when the balancing circuit in the battery management system is turned on. The redundant switch K1 can be understood as a switch for turning on or off the balancing circuit in the battery management system. When the power battery selects the second power balancing circuit, the redundant switch K1 is in the off state.

In the embodiment of the present application, when the current temperature of the power battery collected by the collection unit in the battery management system is greater than the first preset threshold, the redundant switch K1 and the second MOS transistor Q2 are turned off, so that the first resistor R1 and the fourth resistor R4 are turned off. It is connected in series, and forms a second power equalization circuit with the power battery for low power equalization. The resistance values of the first resistor R1 and the fourth resistor R4 in the second power balancing circuit are relatively large, so that the current in the second power balancing circuit is smaller than the current in the first power balancing circuit. The lower power is the continuous balancing current of the power battery.

In the embodiment of the present application, an implementation manner of the first power equalization circuit and the second power equalization circuit is as follows:

FIG. 1A is a circuit diagram of a battery management system in Embodiment 1 of the present application. As shown in FIG. 1A , one end of the first resistor R1 and the second resistor R2 are both connected to the positive electrode of the power battery pack, and one end of the second resistor R2 is connected to the positive electrode of the power battery pack. The S pole of the first MOS transistor Q1 is connected, and the other end of the first resistor R1 is connected to the S pole of the second MOS transistor Q2; the gate (G pole) of the first MOS transistor Q1 is connected to the gate of the second MOS transistor Q2 The poles are respectively connected to the battery management system (BMS, Battery Management System); the D pole of the first MOS transistor Q1 is connected to the third resistor R3, and the D pole of the second MOS transistor Q2 is connected to the fourth resistor R4; wherein, the third resistance R3 and the fourth resistor R4 are respectively connected to the two SPST of the redundant switch K1, and the two SPST switches are connected to the negative pole of the power battery. The battery temperature sensor RT1, the equalization circuit temperature sensor RT2, and the battery management system temperature sensor RT3 are respectively connected to the battery management system; wherein the first resistor R1 is 10Ω, the second resistor R2 is 0.5Ω, and the third resistor R3 is 3.7Ω and the fourth resistor R4 is 68Ω. When the current temperature of the power battery collected by the battery management system is lower than the first preset threshold, the redundant switch K1 and the first MOS transistor Q1 are turned off, so that the second resistor R2 and the third resistor R3 are connected in series, and form a first Power equalization circuit. When the current temperature of the power battery collected by the battery management system is greater than the first preset threshold, the redundant switch K1 and the second MOS transistor Q2 are turned off, so that the first resistor R1 and the fourth resistor R4 are connected in series, and form a second resistor with the power battery. Power equalization circuit.

In the embodiment of the present application, the battery management system includes: a power battery pack, a balanced heat conduction plate, and a collection unit. Wherein, the balanced heat conduction plate is installed on the surface of the power battery pack. Wherein, the balanced heat conduction plate integrates the first power balance circuit and the second power balance circuit.

In Figure 1A, the pins of the BMS component are MOS-H, MOS-L, BMS-12V, TEMP1, TEMP2 and TEMP3.

In one embodiment, the battery management system further includes the fault diagnosis unit;

Wherein, the fault diagnosis unit is connected with the first power balance circuit and the second power balance circuit, and is connected with the acquisition unit at the same time;

The fault diagnosis unit is configured to determine the first power balance circuit or the second power according to the power battery voltage and the current voltage in the first power balance circuit or the second power balance circuit Equalization circuit health.

In the embodiment of the present application, the fault diagnosis unit can be understood as that after the first power equalization circuit or the second power equalization circuit is turned on in the battery management system, the first power equalization circuit or the second power equalization circuit can be performed according to the parameters collected by the acquisition unit. Diagnostics of health.

In the embodiment of the present application, the fault diagnosis unit in the battery management system compares the voltages of the power battery before and after the first power equalization circuit, the second power equalization circuit, and the equalization circuit before and after the equalization circuit is closed. The operation status of the power balancing circuit or the second power balancing circuit is determined. If the difference between the voltage of the power battery in the first power balancing circuit or the second power balancing circuit and the current voltage of the power battery collected by the first power balancing circuit or the second power balancing circuit is greater than the second preset threshold, the first power The equalization circuit or the second power equalization circuit is normally turned on. If the difference between the voltage of the power battery in the first power balancing circuit or the second power balancing circuit and the current voltage of the power battery collected by the second power balancing circuit without the first power balancing circuit is smaller than the second preset threshold, the first power balancing circuit The circuit or the second power balancing circuit is not normally turned on. If the voltage difference between the power batteries before and after the balancing circuit is turned off is less than the second preset threshold, the balancing circuit is turned off.

In one embodiment, the collection unit is further used for:

collecting the working status of the battery management system;

In response to the working state of the battery management system being a stop working or a dormant state, the redundant switch K1 in the first power balancing circuit or the second power balancing circuit is automatically turned on.

In the embodiment of the present application, the working state of the battery management system may be understood as the current working condition of the battery management system. The working states of the battery management system include: a dormant state, a stopped state, a normal operation, and a fault state.

In the embodiment of the present application, the collection unit in the battery management system collects the current working state of the battery management system. The redundant switch K1 is automatically turned on to protect the balancing circuit and prevent the battery management system from being in a non-working state, unable to judge the demand of the power battery, and forming a loop, which will further cause the battery to be unbalanced and cause battery damage.

In one embodiment, the collection unit is further used for:

collecting the working mode of the power battery;

In response to the power battery being in the discharge mode, the upper bridge arm and the lower bridge arm of the redundant switch K1 are turned off in sequence.

In the embodiment of the present application, the working mode of the power battery can be understood as the current state of the power battery in the battery management system. Among them, the working mode of the power battery can be a discharge mode, a charging mode, and a storage mode. The upper bridge arm can be understood as one of the double-pole single-throw switches in the redundant switch K1, and is used to form a switch of the first power balance circuit loop. The lower bridge arm can be understood as one of the double-pole single-throw switches in the redundant switch K1, and is used to form the switch of the second power balance circuit loop.

In the embodiment of the present application, the working mode of the power battery collected by the collection unit in the battery management system is the discharge mode. Since the discharge current load is not controlled by the battery management system during the discharge process, the balancing circuit of the power battery is turned off during the discharge process. If the working mode of the power battery is the discharge mode, the upper bridge arm and the lower bridge arm of the redundant switch K1 are disconnected in turn.

In the embodiment of the present application, an implementation manner of the battery management system is as follows:

FIG. 1B is a flowchart of a battery management system in Embodiment 1 of the application. As shown in FIG. 1B , the acquisition unit in the battery management system acquires the current temperature, voltage, working mode of the power battery and the temperature of the battery management system; Whether the current working mode of the battery is in the discharging working mode, if the working mode of the power battery is the charging mode, it is determined whether the current temperature of the power battery is less than the first preset threshold, if the current temperature of the power battery is less than the first preset threshold, then Turn on the first power balance circuit, and collect the voltage of the power battery in the first power balance circuit; if the current temperature of the power battery is greater than the first preset threshold, start the second power balance circuit, and collect the power in the second power balance circuit battery voltage. If the working mode of the power battery is the discharge mode, the upper bridge arm and the lower bridge arm are disconnected in turn, and the voltage of the power battery in the current circuit is collected. According to the comparison between the voltage of the power battery in the current equalization circuit and the current voltage before the equalization circuit is not turned on, the current circuit state is determined, and the adjustment of the equalization circuit is ended. At the same time, the temperature, voltage, and working mode of the power battery at the next moment are collected, and the above steps of the equalization circuit adjustment cycle at the next moment are performed.

This application builds a battery management system, the battery management system includes: a first power balance circuit, a second power balance circuit, a power battery, and a collection unit; wherein, the first power balance circuit, the second power balance circuit The equalization circuit and the power battery are respectively connected to the acquisition unit, the first power equalization circuit and the second power equalization circuit are respectively connected to the power battery; the power battery is used for equalizing the first power The circuit and the second power balance circuit provide electrical energy; the collection unit is used to collect the current temperature and current voltage of the power battery; the first power balance circuit is used to respond that the current temperature of the power battery is lower than the first A preset threshold is used to turn on the first power balancing circuit; the second power balancing circuit is configured to turn on the second power balancing circuit in response to the current temperature of the power battery being greater than the first preset threshold. It solves the problem of prolonging the balancing time in the balanced solution of the battery balancing system in the related art, which causes the balancing time to be prolonged and the power battery cannot be charged when the temperature is low. It realizes the adjustment of the balancing power according to the real-time battery temperature state, shortens the balancing time, and improves the performance of the battery. Equalization circuit safety.

Embodiment 2

2 is a flowchart of a battery management method provided in Embodiment 2 of the present application. The method can perform power battery balancing, and the method can be performed by a battery management system, including the following steps:

S210, collecting the current temperature and current voltage of the power battery;

S220, in response to the current temperature of the power battery being less than a first preset threshold, turn on the first power balancing circuit;

S230, according to the power battery voltage and the current voltage in the first power balancing circuit, determine the operating status of the first power balancing circuit.

In the embodiment of the present application, when the balancing circuit is turned on in the battery management system, the power battery provides electrical energy for the first power balancing circuit. A plurality of temperature sensors are arranged in the first power balance circuit, so as to collect the current temperature of the power battery. The first power equalization circuit in the battery management system selects to open the first power equalization circuit according to the current temperature of the power battery after the equalization circuit is turned on for the battery management system. When the current temperature of the power battery collected by the acquisition unit is less than the first preset threshold, it means that the first power balancing circuit needs to be activated to perform high-power balancing to generate heat to provide heat to the power battery.

In one embodiment, after collecting the current temperature and current voltage of the power battery, the method further includes:

In response to the current temperature of the power battery being greater than a first preset threshold, turning on the second power equalization circuit;

According to the power battery voltage and the current voltage in the second power balancing circuit, the operating status of the second power balancing circuit is determined.

In the embodiment of the present application, when the balancing circuit is turned on in the battery management system, the power battery provides electrical energy for the second power balancing circuit. A plurality of temperature sensors are arranged in the second power balance circuit, so as to collect the current temperature of the power battery. The second power balancing circuit in the battery management system turns on the second power balancing circuit according to the selection of the current temperature of the power battery after turning on the balancing circuit for the battery management system. When the collecting unit collects that the current temperature of the power battery is greater than the first preset threshold, it means that the second power balancing circuit needs to be activated to balance the current.

The present application collects the current temperature and current voltage of the power battery; when the current temperature of the power battery is less than a first preset threshold, the first power balancing circuit is turned on; according to the description in the first power balancing circuit The power battery voltage and the current voltage determine the operating condition of the first power balancing circuit. It solves the problem that the equalization time is prolonged due to the increase of the resistance temperature in the equalized solution in the battery equalization system in the related art, and the power battery cannot be charged when the temperature is low, and the equalization power is adjusted according to the real-time battery temperature state, and the equalization time is shortened. , to improve the safety of the equalization circuit.

Embodiment 3

FIG. 3 is a schematic structural diagram of a vehicle provided in Embodiment 3 of the application. As shown in FIG. 3 , the vehicle includes a temperature sensor 31 , a controller 32 , a storage device (ie, a memory) 33 , an input device 34 , an output device 35 and Power battery 36; the number of temperature sensors 31 and controllers 32 in the vehicle can be one or more, and one temperature sensor 31 and controller 32 are taken as an example in FIG. 3; the temperature sensor 31, the controller 32, the storage device in the vehicle 33. The input device 34 and the output device 35 may be connected by a bus or in other ways, and the connection by a bus is taken as an example in FIG. 3 .

The power battery 36 is used to store electrical energy to provide an energy source for the electric vehicle.

As a computer-readable storage medium, the storage device 33 can be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the battery management method in the embodiments of the present application. The controller 32 executes various functional applications and data processing of the vehicle by running the software programs, instructions and modules stored in the storage device 33 , that is, to implement the above-mentioned battery management method.

The storage device 33 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. In addition, storage device 33 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, the storage device 33 may further include memory located remotely from the controller 32, which remote memory may be connected to the vehicle through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The input device 34 may be used to receive input numerical or character information and to generate key signal input related to user settings and function control of the vehicle. The output device 35 may include a display device such as a display screen.

In one embodiment, the vehicle further includes:

A battery management system, configured to manage the power battery.

Embodiment 4

Embodiment 4 of the present application further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are used to execute a battery management method for a battery management system when executed by a computer processor, and the method includes:

Collect the current temperature and current voltage of the power battery;

In response to the current temperature of the power battery being less than a first preset threshold, turning on the first power balancing circuit;

According to the power battery voltage and the current voltage in the first power balancing circuit, the operating status of the first power balancing circuit is determined.

The computer storage medium of the embodiments of the present application may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM, Read-Only Memory), erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable of the above The combination. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

The storage medium may be a non-transitory storage medium.

A computer-readable signal medium may include a propagated data signal in baseband or as part of a carrier wave, with computer-readable program code embodied thereon. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device .

The program code contained on the computer readable medium can be transmitted by any suitable medium, including - but not limited to wireless, wire, optical cable, RF (Radio Frequency, radio frequency), etc., or any suitable combination of the above.

Computer program code for carrying out the operations of the present application may be written in one or more programming languages, including object-oriented programming languages—such as Java, Smalltalk, C++, but also conventional Procedural programming language - such as "C" language or similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or Wide Area Network (WAN), or it may be connected to an external computer ( For example, using an Internet service provider to connect via the Internet).

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

Claims (13)

1. A battery management system, the battery management system comprising: a first power balance circuit (110), a second power balance circuit (120), a power battery (130) and a collection unit (140);

   Wherein, the first power balance circuit (110), the second power balance circuit (120) and the power battery (130) are respectively connected to the acquisition unit (140), and the first power balance circuit (110) ) and the second power equalization circuit (120) are respectively connected to the power battery (130);

   The power battery (130) is configured to provide electrical energy for the first power equalization circuit (110) and the second power equalization circuit (120);

   the collection unit (140), configured to collect the current temperature and current voltage of the power battery (130);

   The first power balancing circuit (110) is configured to turn on the first power balancing circuit (110) in response to the current temperature of the power battery (130) being less than a first preset threshold;

   The second power equalization circuit (120) is configured to turn on the second power equalization circuit (120) in response to the current temperature of the power battery (130) being greater than a first preset threshold.
2. The system according to claim 1, wherein the first power balance circuit (110) comprises: a second resistor (R2), a third resistor (R3), a first MOS transistor (Q1), a redundant switch ( K1) and battery temperature sensor (RT1);

   One end of the second resistor (R2) is connected to the positive electrode of the power battery (130), the other end of the second resistor (R2) is connected to the S pole of the first MOS transistor (Q1), and the first The D pole of the MOS transistor (Q1) is connected to one end of the third resistor (R3), the other end of the third resistor (R3) is connected to one end of the redundant switch (K1), and the redundant The other end of the switch (K1) is connected to the negative pole of the power battery (130), and the load extension line of the redundant switch (K1) is connected to the acquisition unit (140);

   The second resistor (R2) and the third resistor (R3) are set to form the current of the first power balancing circuit (110);

   the first MOS transistor (Q1) is configured to form a loop of the first power equalization circuit (110);

   the redundant switch (K1), configured to protect the first power balancing circuit (110);

   The battery temperature sensor (RT1) is configured to collect the current temperature of the power battery (130).
3. The system according to claim 1, wherein the second power balancing circuit (120) comprises: a first resistor (R1), a fourth resistor (R4), a second MOS transistor (Q2), a redundant switch ( K1) and battery temperature sensor (RT1);

   Wherein, one end of the first resistor (R1) is connected to the positive electrode of the power battery (130), and the other end of the first resistor (R1) is connected to the S pole of the second MOS transistor (Q2). The D pole of the tube (Q1) is connected to one end of the fourth resistor R4, the other end of the fourth resistor (R4) is connected to one end of the redundant switch (K1), and the redundant switch (K1) ) is connected to the negative pole of the power battery (130), and the load extension line of the redundant switch (K1) is connected to the acquisition unit (140);

   The first resistor (R1) and the fourth resistor (R4) are set to form the current of the second power balancing circuit (120);

   The second MOS transistor (Q2) is configured to form a loop of the second power equalization circuit (120);

   the redundant switch (K1), configured to protect the second power balancing circuit (120);

   Wherein, the first resistance ( R1 ) is greater than the second resistance ( R2 ), and the fourth resistance ( R4 ) is greater than the third resistance ( R3 ).
4. The system according to claim 1 or 2, wherein the second power balancing circuit (120) comprises: a first resistor (R1), a fourth resistor (R4), a second MOS transistor (Q2) and redundancy switch(K1);

   Wherein, one end of the first resistor (R1) is connected to the positive electrode of the power battery (130), and the other end of the first resistor (R1) is connected to the S pole of the second MOS transistor (Q2). The D pole of the tube (Q1) is connected to one end of the fourth resistor R4, the other end of the fourth resistor (R4) is connected to one end of the redundant switch (K1), and the redundant switch (K1) ) is connected to the negative pole of the power battery (130), and the load extension line of the redundant switch (K1) is connected to the acquisition unit (140);

   The first resistor (R1) and the fourth resistor (R4) are set to form the current of the second power balancing circuit (120);

   The second MOS transistor (Q2) is configured to form a loop of the second power equalization circuit (120);

   The redundant switch (K1) is configured to protect the second power balancing circuit (120).
5. The system of claim 1, the battery management system, further comprising the fault diagnosis unit;

   Wherein, the fault diagnosis unit is respectively connected with the first power equalization circuit (110) and the second power equalization circuit (120), and is connected with the acquisition unit (140);

   The fault diagnosis unit is configured to determine the first power balance circuit (110) according to the power battery (130) voltage and the current voltage in the first power balance circuit (110) or the second power balance circuit (120). The operation status of the power equalization circuit (110) or the second power equalization circuit (120).
6. The system according to claim 1, wherein the collection unit (140) is further configured to:

   collecting the working status of the battery management system;

   In response to the working state of the battery management system being a stop working or a dormant state, the redundant switch (K1) in the first power balancing circuit (110) or the second power balancing circuit (120) is turned on.
7. The system according to claim 1, wherein the collection unit (140) is further configured to:

   collecting the working mode of the power battery (130);

   In response to the power battery (130) being in the discharge working mode, the upper bridge arm and the lower bridge arm of the redundant switch (K1) are turned off in sequence.
8. A battery management method, executed by the battery management system according to any one of claims 1-7, comprising:

   collecting the current temperature and current voltage of the power battery (130);

   In response to the current temperature of the power battery (130) being less than a first preset threshold, turning on the first power balancing circuit (110);

   According to the voltage of the power battery (130) and the current voltage in the first power balancing circuit (110), the operating status of the first power balancing circuit (110) is determined.
9. The method according to claim 8, after said collecting the current temperature and current voltage of the power battery (130), further comprising:

   In response to the current temperature of the power battery (130) being greater than a first preset threshold, turning on the second power balancing circuit (120);

   According to the voltage of the power battery (130) and the current voltage in the second power balancing circuit (120), the operating status of the second power balancing circuit (120) is determined.
10. A vehicle comprising:

    one or more processors;

    storage means arranged to store one or more programs,

    The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the battery management system of any one of claims 1-7.
11. A storage medium containing computer-executable instructions, when executed by a computer processor, for implementing the battery management system of any one of claims 1-7.
12. A vehicle comprising:

    one or more processors;

    storage means arranged to store one or more programs,

    When the one or more programs are executed by the one or more processors, the one or more processors implement the battery management method as claimed in claim 8 or 9.
13. A storage medium containing computer-executable instructions for performing the battery management method of claim 8 or 9 when executed by a computer processor.

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