Control method, device and equipment of power battery and medium

Abstract

The invention discloses a control method, device and equipment of a power battery and a medium, and belongs to the technical field of batteries. The method comprises the steps that the first fault frequency of a cooling water pump of the power battery, the second fault frequency of a power supply loop of the cooling water pump and the circulation state of cooling water are obtained, and the circulation state comprises the failure state and the normal state; according to the first fault frequency, the second fault frequency and the circulation state, the maximum charging electric quantity of the power battery is determined; and controlling the charging electric quantity of the power battery to be smaller than the maximum charging electric quantity. According to the method, when thermal runaway happens to the power battery, the power performance of the vehicle is guaranteed, meanwhile, the gas production amount and the heat production amount in the thermal runaway process are reduced as much as possible, spreading of thermal runaway is effectively controlled, the damage degree of the power battery is reduced, and the occurrence probability of fire disasters or explosions is reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a control method, device, equipment and medium for a power battery. Background Art

[0002] New energy vehicles are developing rapidly under the vigorous promotion of the country. Power batteries are the core of new energy vehicles. Lithium-ion batteries are often used as power batteries to provide power for the entire vehicle, and their safety performance has attracted much attention. For example, the risk of thermal runaway will increase when the power battery is charged.

[0003] In the related technology, relevant parameters of the power battery are monitored, and when it is determined that the power battery has thermal runaway based on the relevant parameters, the power battery is cooled to reduce personal injury and economic losses caused by the thermal runaway event of the power battery.

[0004] However, with the continuous development of power batteries, their energy density is also increasing. When thermal runaway occurs, even with cooling, the control over the spread of thermal runaway is limited, resulting in a high risk of serious damage to the power battery itself, fire or explosion. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a control method, device, equipment and medium for a power battery that solves the above problems. The upper limit of the charging capacity of the power battery can be determined according to the number and severity of faults in the cooling water pump of the power battery and the power supply circuit of the cooling water pump. Therefore, when thermal runaway occurs in the power battery, the gas production and heat production in the thermal runaway process can be reduced as much as possible while ensuring the power of the vehicle, thereby effectively controlling the spread of thermal runaway, reducing the degree of damage to the power battery, and reducing the probability of fire or explosion.

[0006] In a first aspect, the present invention provides a method for controlling a power battery, the method comprising:

[0007] Obtaining a first failure number of a cooling water pump of a power battery, a second failure number of a power supply circuit of the cooling water pump, and a circulation state of cooling water, wherein the circulation state includes a failure state and a normal state;

[0008] Determining a maximum charge capacity of the power battery according to the first fault number, the second fault number and the cycle state;

[0009] The charging amount of the power battery is controlled to be less than the maximum charging amount.

[0010] Optionally, determining the maximum charge capacity of the power battery according to the first fault number, the second fault number and the cycle state includes:

[0011] Calculate the sum of the first fault number and the second fault number to obtain a total fault number;

[0012] The maximum charging capacity of the power battery is determined according to the total number of failures and the cycle status.

[0013] Optionally, determining the maximum charging capacity of the power battery according to the total number of failures and the cycle state includes:

[0014] If the total number of failures is less than a preset number threshold, and the cycle state is the normal state, determining that the maximum charging capacity of the power battery is a preset first capacity;

[0015] If the total number of failures is greater than or equal to the number threshold, and the cycle state is the normal state, determining that the maximum charging capacity of the power battery is a preset second capacity;

[0016] If the total number of failures is less than the number threshold, and the cycle state is the failure state, determining that the maximum charging capacity of the power battery is a preset third capacity;

[0017] If the total number of failures is greater than or equal to the number threshold, and the cycle state is the failure state, the maximum charging capacity of the power battery is determined to be a preset fourth capacity.

[0018] Optionally, the first power, the second power, the third power and the fourth power decrease sequentially.

[0019] Optionally, the method further includes:

[0020] Obtaining the maximum capacity of the power battery;

[0021] Determine that the first power is the product of a preset first ratio and the maximum capacity, the second power is the product of a preset second ratio and the maximum capacity, the third power is the product of a preset third ratio and the maximum capacity, and the fourth power is the product of a preset fourth ratio and the maximum capacity.

[0022] Optionally, the method further includes:

[0023] Acquire a voltage sampling circuit state of the power battery, wherein the voltage sampling circuit state includes a fault state and a non-fault state;

[0024] If the voltage sampling circuit state is the fault state, the cooling water pump is started to cool the power battery.

[0025] Optionally, starting the cooling water pump to cool the power battery includes:

[0026] The cooling water pump is started, and a duty cycle of the cooling water pump is controlled to be greater than a preset duty cycle threshold value, so as to cool the power battery.

[0027] In a second aspect, the present invention provides a control device for a power battery, the device comprising:

[0028] An acquisition module, used to acquire a first failure number of a cooling water pump of a power battery, a second failure number of a power supply circuit of the cooling water pump, and a circulation state of cooling water, wherein the circulation state includes a failure state and a normal state;

[0029] A first determination module, configured to determine a maximum charge capacity of the power battery according to the first fault number, the second fault number and the cycle state;

[0030] The control module is used to control the charging amount of the power battery to be less than the maximum charging amount.

[0031] Optionally, the first determining module includes:

[0032] a calculation unit, configured to calculate the sum of the first fault number and the second fault number to obtain a total fault number;

[0033] A determination unit is used to determine the maximum charging capacity of the power battery according to the total number of failures and the cycle state.

[0034] Optionally, the determining unit is further configured to:

[0035] If the total number of failures is less than a preset number threshold, and the cycle state is the normal state, determining that the maximum charging capacity of the power battery is a preset first capacity;

[0036] If the total number of failures is greater than or equal to the number threshold, and the cycle state is the normal state, determining that the maximum charging capacity of the power battery is a preset second capacity;

[0037] If the total number of failures is less than the number threshold, and the cycle state is the failure state, determining that the maximum charging capacity of the power battery is a preset third capacity;

[0038] If the total number of failures is greater than or equal to the number threshold, and the cycle state is the failure state, the maximum charging capacity of the power battery is determined to be a preset fourth capacity.

[0039] Optionally, the first power level, the second power level, the third power level and the fourth power level decrease in sequence.

[0040] Optionally, the device further includes a second determining module, configured to:

[0041] Obtaining the maximum capacity of the power battery;

[0042] Determine that the first power is the product of a preset first ratio and the maximum capacity, the second power is the product of a preset second ratio and the maximum capacity, the third power is the product of a preset third ratio and the maximum capacity, and the fourth power is the product of a preset fourth ratio and the maximum capacity.

[0043] Optionally, the device further comprises a starting module, which is used to:

[0044] Acquire a voltage sampling circuit state of the power battery, wherein the voltage sampling circuit state includes a fault state and a non-fault state;

[0045] If the voltage sampling circuit state is the fault state, the cooling water pump is started to cool the power battery.

[0046] Optionally, the startup module is also used to:

[0047] The cooling water pump is started, and a duty cycle of the cooling water pump is controlled to be greater than a preset duty cycle threshold value, so as to cool the power battery.

[0048] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.

[0049] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0050] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0051] The embodiment of the present invention provides a control method, device, equipment and medium for a power battery, which obtains the first fault number of the cooling water pump of the power battery, the second fault number of the power supply circuit of the cooling water pump and the circulation state of the cooling water, and understands the cooling capacity of the cooling water pump. The circulation state includes a failure state and a normal state; according to the first fault number, the second fault number and the circulation state, the maximum charging capacity of the power battery is determined, and the upper limit of the charging capacity of the power battery is determined according to the cooling capacity; the charging capacity of the power battery is controlled to be less than the maximum charging capacity, so that when thermal runaway occurs, the amount of gas and heat generated is related to the cooling capacity. This method can minimize the gas and heat generated during the thermal runaway process while ensuring the power of the vehicle when the power battery has thermal runaway, effectively control the spread of thermal runaway, reduce the degree of damage to the power battery, and reduce the probability of fire or explosion.

[0052] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0054] Figure 1 is a flow chart of a power battery control method provided by an embodiment of the present invention;

[0055] Figure 2 It is a structural block diagram of a control device for a power battery provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation mode of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0057] Figure 1 is a flow chart of a control method for a power battery provided by an embodiment of the present invention. Figure 1 As shown, the method includes steps S110 to S130.

[0058] Step S110, obtaining a first failure frequency of the cooling water pump of the power battery, a second failure frequency of the power supply circuit of the cooling water pump, and a circulation status of the cooling water.

[0059] The cycle state includes a failure state and a normal state.

[0060] In this embodiment, the number of failures of the cooling water pump of the power battery will be counted. The cooling water pump is used to circulate the cooling water to cool the power battery. Each time the cooling water pump reports a fault, the number of counts will be increased by 1 and recorded as the first number of faults. Common cooling water pump faults include water pump circuit breaker faults, water pump short circuit faults, water pump idling, water pump power supply abnormalities, and water pump overcurrent / overvoltage faults. When some faults occur, a reminder can be given by lighting an indicator light, and when some faults occur, a fault response is handled by limiting power. After some faults occur, the circulation state of the cooling water will change from a normal state to a failure state. All of the above contents will be recorded one by one in the table. Exemplary, the cooling water pump fault information list is as follows:

[0061] Table 1

[0062]

[0063] In this embodiment, the number of failures of the power supply circuit of the cooling water pump is also counted, and the power supply circuit is used to provide power for the cooling water pump. Each time the power supply circuit reports a fault, the number of counts is increased by 1 and recorded as the second number of faults. Common power supply circuit failures include battery open circuit failure, battery short circuit failure, battery undervoltage warning, battery overvoltage warning, and battery overcurrent warning. When some failures occur, a reminder can be given by lighting an indicator light. When some failures occur, a fault response is processed by requesting a high voltage. After some failures occur, the circulation state of the cooling water will change from a normal state to a failure state. All of the above contents will be recorded one by one in the table. Exemplary, the power supply circuit failure information list is as follows:

[0064] Table 2

[0065]

[0066] In this embodiment, the first number of failures and the second number of failures are reset to zero after the parts are repaired and replaced at the after-sales point, that is, the number of failures is the number of failures that occur between two repairs.

[0067] Among them, the power battery is cooled by the circulation of cooling water. When the circulation state of the cooling water is normal, it means that the cooling water can circulate normally and cool the power battery. When the circulation state of the cooling water is failed, it means that the cooling water cannot circulate and cannot cool the power battery, resulting in cooling failure.

[0068] Step S120: determining the maximum charging capacity of the power battery according to the first fault number, the second fault number and the cycle state.

[0069] In this embodiment, the cooling capacity is reflected by the first fault number, the second fault number and the cycle state. When the power battery has thermal runaway, the current cooling capacity directly affects the degree of diffusion of the thermal runaway. The power of the power battery during thermal runaway directly affects the amount of gas and the total heat emitted by the power battery. Therefore, by controlling the maximum charge capacity of the power battery, that is, controlling the full charge SOC (State of Charge) of the power battery, the amount of gas and the total heat emitted by the power battery during thermal runaway can be effectively controlled to reduce the probability of thermal diffusion. Among them, different cooling capacities correspond to different maximum charge capacities. The lower the cooling capacity, the smaller the maximum charge capacity can be. When the cooling capacity is limited during thermal runaway, the amount of gas and the total heat emitted by the power battery can be reduced, which can effectively reduce the probability of thermal diffusion.

[0070] Step S130: Control the charging power of the power battery to be less than the maximum charging power.

[0071] In this embodiment, when the power battery is being charged, the charging capacity is controlled to be less than the maximum charging capacity, so that the amount of gas and the total heat emitted by the power battery during thermal runaway can be effectively controlled.

[0072] Optionally, step S120 includes:

[0073] The first step is to calculate the sum of the first fault number and the second fault number to obtain the total fault number.

[0074] In this embodiment, the failure times of the cooling water pump and the power supply circuit are summarized to obtain the total failure times, which is equivalent to obtaining the failure times of the entire cooling circuit.

[0075] The second step is to determine the maximum charging capacity of the power battery based on the total number of failures and cycle status.

[0076] In this embodiment, the cooling capacity is reflected by the total number of faults and the cycle state, so that the cooling capacity can be reflected in a more simplified manner, and then the maximum power of the power battery is determined according to the cooling capacity.

[0077] Optionally, the second step includes:

[0078] If the total number of failures is less than the preset number threshold and the cycle state is normal, the maximum charging capacity of the power battery is determined to be the preset first capacity;

[0079] If the total number of failures is greater than or equal to the number threshold, and the cycle state is normal, determining that the maximum charge capacity of the power battery is a preset second charge capacity;

[0080] If the total number of failures is less than the number threshold, and the cycle state is a failure state, the maximum charge capacity of the power battery is determined to be a preset third capacity;

[0081] If the total number of failures is greater than or equal to the number threshold, and the cycle state is a failure state, the maximum charging capacity of the power battery is determined to be a preset fourth capacity.

[0082] In this embodiment, different total fault times and different circulation states correspond to different maximum charging capacities. Specifically, if the total fault times are less than the preset times threshold, and the circulation state is in a normal state, it means that the overall problem of the cooling circuit is not serious, and the cooling water can circulate normally. At this time, the maximum charging capacity of the power battery is the first capacity, and the first capacity can be lower than the maximum capacity of the power battery. If the total fault times are greater than or equal to the times threshold, and the circulation state is in a normal state, it means that the overall problem of the cooling circuit is a bit serious, but the cooling water can circulate normally. At this time, the maximum charging capacity of the power battery is the second capacity, and the second capacity can be lower than the first capacity. If the total fault times are less than the times threshold, and the circulation state is in a failure state, it means that the overall problem of the cooling circuit is not serious, but the cooling water may not circulate normally. At this time, the maximum charging capacity is the third capacity, and the third capacity can be lower than the second capacity; if the total fault times are greater than or equal to the times threshold, and the circulation state is in a failure state, it means that the overall problem of the cooling circuit is a bit serious, and the cooling water cannot circulate normally. At this time, the maximum charging capacity is the fourth capacity, and the fourth capacity can be lower than the third capacity.

[0083] Optionally, the first power level, the second power level, the third power level and the fourth power level decrease in sequence.

[0084] In this embodiment, as the cooling capacity decreases, the corresponding maximum charging capacity also gradually decreases, so that when the cooling capacity is limited during thermal runaway, the amount of gas and total heat emitted by the power battery can be reduced, which can effectively reduce the probability of thermal diffusion. When the cooling capacity is strong during thermal runaway, the maximum charging capacity can be large, which can ensure the power of the vehicle. When thermal runaway occurs, the diffusion of thermal runaway is mainly controlled by cooling. When the cooling capacity is poor, the maximum charging capacity should be reduced, that is, the actual power of the power battery should be reduced to assist the diffusion of resistance thermal runaway.

[0085] The magnitudes of the first power, the second power, the third power and the fourth power may be determined according to a DOD (Depth of Discharge) interval and actual conditions.

[0086] Optionally, the method further includes:

[0087] Obtain the maximum capacity of the power battery; determine the first power as the product of a preset first ratio and the maximum capacity, the second power as the product of a preset second ratio and the maximum capacity, the third power as the product of a preset third ratio and the maximum capacity, and the fourth power as the product of a preset fourth ratio and the maximum capacity.

[0088] In this embodiment, the maximum charging capacity can be determined according to the maximum capacity of the power battery, for example, by multiplying the maximum capacity by a ratio to obtain a maximum charging capacity. That is, the first capacity is the product of the first ratio and the maximum capacity, the second capacity is the product of the second ratio and the maximum capacity, the third capacity is the product of the third ratio and the maximum capacity, and the fourth capacity is the product of the fourth ratio and the maximum capacity. Since the first capacity> the second capacity> the third capacity> the fourth capacity, the first ratio> the second ratio> the third ratio> the fourth ratio.

[0089] Exemplarily, the first ratio is 97%, the second ratio is 80%, the third ratio is 70%, and the fourth ratio is 60%.

[0090] Optionally, the method further includes:

[0091] Step S210: Acquire the voltage sampling circuit state of the power battery, where the voltage sampling circuit state includes a fault state and a non-fault state.

[0092] In this embodiment, the state of the voltage sampling circuit can reflect whether the voltage of the power battery can be collected normally. When it is in a fault state, it means that the voltage of the power battery cannot be collected normally. When it is in a non-fault state, it means that the voltage of the power battery can be collected normally.

[0093] Step S220: If the voltage sampling circuit is in a fault state, start the cooling water pump to cool the power battery.

[0094] In this embodiment, if the voltage of the power battery cannot be collected normally, it means that thermal runaway may occur. Because it will not be a fault state under normal circumstances, the fault state is likely to be caused by thermal runaway, so the probability of thermal runaway is very high. At this time, the cooling water pump is started to cool the power battery to reduce the spread of thermal runaway, reduce the degree of damage to the power battery, and reduce losses.

[0095] In this embodiment, the temperature, voltage and air pressure of the power battery can also be obtained; the temperature rise rate is determined according to the temperature, and the air pressure rise rate and rise value are determined according to the air pressure; if the temperature is greater than the first temperature threshold and the temperature rise rate is greater than the temperature rise rate threshold, or the temperature is greater than the second temperature threshold, or the voltage is less than the voltage threshold and the duration is greater than the set time, or the air pressure rise rate is greater than the air pressure rate threshold, or the rise value is greater than the rise threshold, it indicates that thermal runaway may occur, and the cooling water pump is started to cool the power battery. That is to say, when one of the above conditions is met, the cooling water pump is started for cooling, and the thermal runaway is processed at the fastest speed, without adding other additional time-consuming condition judgments, so that the thermal runaway is effectively controlled in the first time to prevent the occurrence of heat diffusion. Among them, the first temperature threshold is less than the second temperature threshold, for example, the first temperature threshold is 60°C, the second temperature threshold is 72°C, the temperature rise rate threshold is 2°C / S, the voltage threshold is 1.5V, the set time is 2 seconds, the air pressure rate threshold is 0.5kpa / s, and the rise threshold is 3kpa.

[0096] Among them, the vehicle thermal management system can request to start the cooling water pump to circulate the cooling water to cool the power battery.

[0097] Optionally, step S220 includes:

[0098] Start the cooling water pump and control the duty cycle of the cooling water pump to be greater than a preset duty cycle threshold to cool the power battery.

[0099] In this embodiment, when cooling is performed after thermal runaway occurs, the cooling water pump should be controlled to work at high efficiency as much as possible, and the power battery should be cooled with as large a cooling capacity as possible to reduce the temperature of the battery cell and reduce the possibility of heat diffusion. The duty cycle threshold may be 90%.

[0100] Based on the same inventive concept, an embodiment of the present invention further provides a control device for a power battery. Figure 2 is a structural block diagram of a control device for a power battery provided by an embodiment of the present invention, such as Figure 2 As shown, the device 200 includes an acquisition module 201 , a first determination module 202 and a control module 203 .

[0101] An acquisition module 201 is used to acquire a first failure number of a cooling water pump of a power battery, a second failure number of a power supply circuit of the cooling water pump, and a circulation state of cooling water, where the circulation state includes a failure state and a normal state;

[0102] A first determination module 202, configured to determine a maximum charge capacity of the power battery according to the first fault number, the second fault number and the cycle state;

[0103] The control module 203 is used to control the charging power of the power battery to be less than the maximum charging power.

[0104] Optionally, the first determining 202 module includes:

[0105] A calculation unit, used for calculating the sum of the first fault number and the second fault number to obtain a total fault number;

[0106] The determination unit is used to determine the maximum charging capacity of the power battery according to the total number of failures and the cycle status.

[0107] Optionally, the determining unit is further configured to:

[0108] If the total number of failures is less than the preset number threshold and the cycle state is normal, the maximum charging capacity of the power battery is determined to be the preset first capacity;

[0109] If the total number of failures is greater than or equal to the number threshold, and the cycle state is normal, determining that the maximum charge capacity of the power battery is a preset second charge capacity;

[0110] If the total number of failures is less than the number threshold, and the cycle state is a failure state, the maximum charge capacity of the power battery is determined to be a preset third capacity;

[0111] If the total number of failures is greater than or equal to the number threshold, and the cycle state is a failure state, the maximum charging capacity of the power battery is determined to be a preset fourth capacity.

[0112] Optionally, the first power level, the second power level, the third power level and the fourth power level decrease in sequence.

[0113] Optionally, the apparatus 200 further includes a second determining module, configured to:

[0114] Get the maximum capacity of the power battery;

[0115] The first power is determined to be the product of a preset first ratio and a maximum capacity, the second power is determined to be the product of a preset second ratio and a maximum capacity, the third power is determined to be the product of a preset third ratio and a maximum capacity, and the fourth power is determined to be the product of a preset fourth ratio and a maximum capacity.

[0116] Optionally, the device 200 further includes a starting module, configured to:

[0117] Obtain the voltage sampling circuit status of the power battery, which includes a fault status and a non-fault status;

[0118] If the voltage sampling circuit is in a fault state, the cooling water pump is started to cool the power battery.

[0119] Optionally, the startup module is also used to:

[0120] Start the cooling water pump and control the duty cycle of the cooling water pump to be greater than a preset duty cycle threshold to cool the power battery.

[0121] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0122] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0123] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application, or may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above-mentioned chips.

[0124] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0125] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0126] The processor implements any one of the power battery control methods in the above embodiments by reading and executing computer program instructions stored in the memory.

[0127] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0128] In addition, in combination with the control method of the power battery in the above embodiments, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any of the control methods of the power battery in the above embodiments is implemented.

[0129] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0130] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0131] The embodiment of the present invention provides a control method, device, equipment and medium for a power battery, which obtains the first fault number of the cooling water pump of the power battery, the second fault number of the power supply circuit of the cooling water pump and the circulation state of the cooling water, and understands the cooling capacity of the cooling water pump. The circulation state includes a failure state and a normal state; according to the first fault number, the second fault number and the circulation state, the maximum charging capacity of the power battery is determined, and the upper limit of the charging capacity of the power battery is determined according to the cooling capacity; the charging capacity of the power battery is controlled to be less than the maximum charging capacity, so that when thermal runaway occurs, the amount of gas and heat generated is related to the cooling capacity. This method can minimize the gas and heat generated during the thermal runaway process while ensuring the power of the vehicle when the power battery has thermal runaway, effectively control the spread of thermal runaway, reduce the degree of damage to the power battery, and reduce the probability of fire or explosion.

[0132] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0133] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0134] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A control method for a power battery, characterized in that: The method comprises: Obtaining a first failure number of a cooling water pump of a power battery, a second failure number of a power supply circuit of the cooling water pump, and a circulation state of cooling water, wherein the circulation state includes a failure state and a normal state; Determining a maximum charge capacity of the power battery according to the first fault number, the second fault number and the cycle state; The charging amount of the power battery is controlled to be less than the maximum charging amount.

2. The control method of the power battery according to claim 1, characterized in that: The determining the maximum charge capacity of the power battery according to the first fault number, the second fault number and the cycle state includes: Calculate the sum of the first fault number and the second fault number to obtain a total fault number; The maximum charging capacity of the power battery is determined according to the total number of failures and the cycle status.

3. The control method of the power battery according to claim 2, characterized in that: The determining the maximum charge capacity of the power battery according to the total number of failures and the cycle state includes: If the total number of failures is less than a preset number threshold, and the cycle state is the normal state, determining that the maximum charging capacity of the power battery is a preset first capacity; If the total number of failures is greater than or equal to the number threshold, and the cycle state is the normal state, determining that the maximum charging capacity of the power battery is a preset second capacity; If the total number of failures is less than the number threshold, and the cycle state is the failure state, determining that the maximum charging capacity of the power battery is a preset third capacity; If the total number of failures is greater than or equal to the number threshold, and the cycle state is the failure state, the maximum charging capacity of the power battery is determined to be a preset fourth capacity.

4. The control method of the power battery according to claim 3, characterized in that: The first power level, the second power level, the third power level, and the fourth power level decrease in sequence.

5. The control method of the power battery according to claim 4, characterized in that: The method further comprises: Obtaining the maximum capacity of the power battery; Determine that the first power is the product of a preset first ratio and the maximum capacity, the second power is the product of a preset second ratio and the maximum capacity, the third power is the product of a preset third ratio and the maximum capacity, and the fourth power is the product of a preset fourth ratio and the maximum capacity.

6. The control method of the power battery according to claim 1, characterized in that: The method further comprises: Acquire a voltage sampling circuit state of the power battery, wherein the voltage sampling circuit state includes a fault state and a non-fault state; If the voltage sampling circuit state is the fault state, the cooling water pump is started to cool the power battery.

7. The control method of the power battery according to claim 6, characterized in that: The step of starting the cooling water pump to cool the power battery includes: The cooling water pump is started, and a duty cycle of the cooling water pump is controlled to be greater than a preset duty cycle threshold value, so as to cool the power battery.

8. A control device for a power battery, characterized in that: The device comprises: An acquisition module, used to acquire a first failure number of a cooling water pump of a power battery, a second failure number of a power supply circuit of the cooling water pump, and a circulation state of cooling water, wherein the circulation state includes a failure state and a normal state; A first determination module, configured to determine a maximum charge capacity of the power battery according to the first fault number, the second fault number and the cycle state; The control module is used to control the charging amount of the power battery to be less than the maximum charging amount.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause the computer to execute the method according to any one of claims 1 to 7.

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