Power battery control method, device, equipment and medium

Abstract

The present invention discloses a control method, device, equipment, and medium for a power battery, belonging to the field of battery technology. The method comprises: obtaining a first fault count of the power battery's cooling water pump, a second fault count of the cooling water pump's power supply circuit, and a cooling water circulation state, wherein the circulation state includes a failure state and a normal state; determining the maximum charge capacity of the power battery based on the first fault count, the second fault count, and the circulation state; and controlling the charge capacity of the power battery to be less than the maximum charge capacity. This method can minimize the gas and heat production during thermal runaway while ensuring the vehicle's power performance when the power battery experiences thermal runaway, effectively controlling the spread of thermal runaway, reducing damage to the power battery, and lowering the probability of fire or explosion.

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] Power batteries are the core of new energy vehicles. Lithium-ion batteries are often used as power batteries to power the vehicle, and their safety performance has attracted considerable attention. For example, charging increases the risk of thermal runaway.

[0003] In related technologies, relevant parameters of the power battery are monitored. 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 of 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 during 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 count of a cooling water pump of a power battery, a second failure count 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] Calculating the sum of the first fault number and the second fault number to obtain a total fault number;

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

[0013] Optionally, determining the maximum charge 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 charge 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 charge 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 charge 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 level, the second power level, the third power level and the fourth power level decrease in sequence.

[0019] Optionally, the method further includes:

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

[0021] Determine that the first power amount is the product of a preset first ratio and the maximum capacity, the second power amount is the product of a preset second ratio and the maximum capacity, the third power amount is the product of a preset third ratio and the maximum capacity, and the fourth power amount 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, where the voltage sampling circuit state includes a fault state and a non-fault state;

[0024] If the voltage sampling circuit is in 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, configured to acquire a first failure count of a cooling water pump of a power battery, a second failure count 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 determining 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 charge 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 charge 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 charge 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 amount is the product of a preset first ratio and the maximum capacity, the second power amount is the product of a preset second ratio and the maximum capacity, the third power amount is the product of a preset third ratio and the maximum capacity, and the fourth power amount is the product of a preset fourth ratio and the maximum capacity.

[0043] Optionally, the device further includes a startup module, configured to:

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

[0045] If the voltage sampling circuit is in 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 solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0051] Embodiments of the present invention provide a power battery control method, apparatus, device, and medium. These methods obtain the first fault count of the power battery's cooling water pump, the second fault count of the cooling water pump's power supply circuit, and the cooling water circulation status, thereby understanding the cooling capacity of the cooling water pump. The circulation status includes a failure state and a normal state. Based on the first fault count, the second fault count, and the circulation status, the maximum charge capacity of the power battery is determined, and the upper limit of the charge capacity of the power battery is determined based on the cooling capacity. The charge capacity of the power battery is controlled to be less than the maximum charge 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 thermal runaway while ensuring the vehicle's power performance when the power battery experiences thermal runaway, effectively controlling the spread of thermal runaway, reducing damage to the power battery, and minimizing 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 in accordance with 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 specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

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

[0055] Figure 2 This is a structural block diagram of a power battery control device 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 methods of the present application will be further described in detail below with reference to 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 This is a flow chart of a method for controlling 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 : Acquire a first failure count of the cooling water pump of the power battery, a second failure count 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 failure, the number of counts will be increased by 1 and recorded as the first failure number. Common cooling water pump failures include water pump circuit breaker failure, water pump short circuit failure, water pump idling, water pump power supply abnormality, and water pump overcurrent / overvoltage failure. When some failures occur, a reminder can be given by lighting an indicator light. When some failures occur, a fault response is performed by limiting the power. 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. For example, the cooling water pump failure 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 failure, the number of counts is increased by 1 and recorded as the second failure number. Common power supply circuit failures include battery circuit failure, battery short circuit failure, battery undervoltage warning, battery overvoltage warning and battery overcurrent warning, etc. When some failures occur, a warning indicator can be lit to remind, and 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 in the table one by one. For example, the power supply circuit failure information list is as follows:

[0064] Table 2

[0065]

[0066] In this embodiment, the first fault number and the second fault number are reset to zero after the parts are repaired or replaced at the after-sales point, that is, the fault number is the number of faults that occurred 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: Determine the maximum charge capacity of the power battery according to the first fault number, the second fault number, and the cycle status.

[0069] In this embodiment, the cooling capacity is reflected by the number of first and second faults, as well as the cycle status. When thermal runaway occurs in a power battery, the current cooling capacity directly affects the extent of the thermal runaway's spread. The power battery's charge level during thermal runaway directly affects the amount of gas and total heat emitted by the power battery. Therefore, by controlling the power battery's maximum charge level—that is, controlling the power battery's fully charged SOC (State of Charge)—the amount of gas and total heat emitted during thermal runaway can be effectively controlled, reducing the probability of thermal spread. Different cooling capacities correspond to different maximum charge levels. The lower the cooling capacity, the lower the maximum charge level can be. This reduces the amount of gas and total heat emitted by the power battery during thermal runaway, even with limited cooling capacity, effectively reducing the probability of thermal spread.

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

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

[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 time, which is equivalent to obtaining the failure time of the entire cooling circuit.

[0075] Step 2: 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 status, so that the cooling capacity can be reflected more simply, 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 a preset number threshold and the cycle state is normal, determining that the maximum charge capacity of the power battery is a 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 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 counts and different circulation states correspond to different maximum charge capacities. Specifically, if the total fault count is less than a preset threshold and the circulation state is normal, it indicates that the overall cooling circuit problem is not serious and the cooling water can circulate normally. In this case, the maximum charge capacity of the power battery is a first charge capacity, which may be lower than the maximum capacity of the power battery. If the total fault count is greater than or equal to the threshold and the circulation state is normal, it indicates that the overall cooling circuit problem is somewhat serious, but the cooling water can circulate normally. In this case, the maximum charge capacity of the power battery is a second charge capacity, which may be lower than the first charge capacity. If the total fault count is less than the threshold and the circulation state is failure, it indicates that the overall cooling circuit problem is not serious, but the cooling water may not circulate normally. In this case, the maximum charge capacity is a third charge capacity, which may be lower than the second charge capacity. If the total fault count is greater than or equal to the threshold and the circulation state is failure, it indicates that the overall cooling circuit problem is somewhat serious and the cooling water cannot circulate normally. In this case, the maximum charge capacity is a fourth charge capacity, which may be lower than the third charge 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 cooling capacity decreases, the corresponding maximum charge capacity also gradually decreases. This reduces the amount of gas and total heat emitted by the power battery during thermal runaway, effectively reducing the probability of thermal spread, given limited cooling capacity. When cooling capacity is high during thermal runaway, the maximum charge capacity can be higher, ensuring vehicle performance. When thermal runaway occurs, cooling is the primary method for controlling its spread. When cooling capacity is low, the maximum charge capacity, i.e., the actual charge capacity of the power battery, is reduced to aid in the spread of resistance thermal runaway.

[0085] The first power level, the second power level, the third power level, and the fourth power level may be determined according to a DOD (Depth of Discharge) range 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 charge capacity can be determined based on the maximum capacity of the power battery, for example, by multiplying the maximum capacity by a ratio to obtain the maximum charge capacity. That is, the first charge capacity is the product of the first ratio and the maximum capacity, the second charge capacity is the product of the second ratio and the maximum capacity, the third charge capacity is the product of the third ratio and the maximum capacity, and the fourth charge capacity is the product of the fourth ratio and the maximum capacity. Since the first charge capacity > the second charge capacity > the third charge capacity > the fourth charge capacity, the first ratio > the second ratio > the third ratio > the fourth ratio is obtained.

[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 status of the power battery, where the voltage sampling circuit status includes a fault state and a non-fault state.

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

[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 indicates 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. Therefore, the probability of thermal runaway is determined to be very high. At this time, the cooling water pump is started to cool the power battery, reduce the spread of thermal runaway, reduce the degree of damage to the power battery, and reduce losses.

[0095] In this embodiment, the power battery's temperature, voltage, and pressure can also be obtained. The temperature rise rate is determined based on the temperature, and the pressure rise rate and value are determined based on the pressure. If the temperature is greater than a first temperature threshold and the temperature rise rate is greater than a temperature rise rate threshold, or the temperature is greater than a second temperature threshold, or the voltage is less than a voltage threshold and the duration is greater than a set time, or the pressure rise rate is greater than a pressure rate threshold, or the value of the rise is greater than a rise threshold, indicating a possible thermal runaway, the cooling water pump is activated to cool the power battery. In other words, if any of the above conditions is met, the cooling water pump is activated for cooling, effectively controlling the thermal runaway as quickly as possible without adding other time-consuming condition determinations. This allows the thermal runaway to be effectively controlled immediately and prevents thermal spread. 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 pressure rate threshold is 0.5 kPa / s, and the rise threshold is 3 kPa.

[0096] Among them, the vehicle thermal management system can request to start the cooling water pump to circulate 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 after thermal runaway occurs, the cooling water pump should be controlled to operate at maximum efficiency, using the maximum cooling capacity possible to cool the power battery, reduce the temperature of the battery cells, and minimize the possibility of heat spread. The duty cycle threshold can 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 This is a structural block diagram of a power battery control device provided by an embodiment of the present invention. 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 configured to acquire a first failure count of a cooling water pump of a power battery, a second failure count of a power supply circuit of the cooling water pump, and a cooling water circulation state, where the circulation state includes a failure state and a normal state;

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

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

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

[0105] A calculation unit, configured to calculate 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 a preset number threshold and the cycle state is normal, determining that the maximum charge capacity of the power battery is a 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 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 the maximum capacity, and the fourth power is determined to be the product of a preset fourth ratio and the maximum capacity.

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

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

[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 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, or a combination of the above chips.

[0124] The memory may include a large-capacity storage device for data or instructions. By way of example, and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, flash memory, an optical disk, a magneto-optical disk, magnetic tape, or a Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory may include removable or non-removable (or fixed) media. Where appropriate, the memory may be internal or external to the electronic device. In certain embodiments, the memory may be 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-programmable 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. The processor, memory, and communication interface are connected via the bus and communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or devices in the embodiments of this application. Where appropriate, the bus may include one or more buses.

[0128] In addition, in conjunction with the power battery control method in the above embodiments, embodiments of the present invention may 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 power battery control methods in the above embodiments is implemented.

[0129] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When executed, the program can include the processes in the above-described method embodiments. 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). 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] Embodiments of the present invention provide a power battery control method, apparatus, device, and medium. These methods obtain the first fault count of the power battery's cooling water pump, the second fault count of the cooling water pump's power supply circuit, and the cooling water circulation status, thereby understanding the cooling capacity of the cooling water pump. The circulation status includes a failure state and a normal state. Based on the first fault count, the second fault count, and the circulation status, the maximum charge capacity of the power battery is determined, and the upper limit of the charge capacity of the power battery is determined based on the cooling capacity. The charge capacity of the power battery is controlled to be less than the maximum charge 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 thermal runaway while ensuring the vehicle's power performance when the power battery experiences thermal runaway, effectively controlling the spread of thermal runaway, reducing damage to the power battery, and minimizing the probability of fire or explosion.

[0132] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may 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 invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Accordingly, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the invention.

[0134] It should be noted that the above embodiments illustrate rather than limit the invention, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" 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 several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. 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 method for controlling a power battery, characterized in that: The method comprises: Obtaining a first failure count of a cooling water pump of a power battery, a second failure count 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 power battery control method 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: Calculating the sum of the first fault number and the second fault number to obtain a total fault number; The maximum charge capacity of the power battery is determined according to the total number of failures and the cycle status.

3. The power battery control method according to claim 2, characterized in that: The determining, according to the total number of failures and the cycle state, the maximum charge capacity of the power battery 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 charge 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 charge 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 charge 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, determining that the maximum charge capacity of the power battery is a preset fourth capacity; The first power level, the second power level, the third power level, and the fourth power level decrease in sequence.

4. The power battery control method according to claim 3, characterized in that: The method further comprises: Obtaining the maximum capacity of the power battery; Determine that the first power amount is the product of a preset first ratio and the maximum capacity, the second power amount is the product of a preset second ratio and the maximum capacity, the third power amount is the product of a preset third ratio and the maximum capacity, and the fourth power amount is the product of a preset fourth ratio and the maximum capacity.

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

6. The power battery control method according to claim 5, 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.

7. A control device for a power battery, characterized in that: The device comprises: an acquisition module, configured to acquire a first failure count of a cooling water pump of a power battery, a second failure count 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 determining 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.

8. 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 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method according to any one of claims 1 to 6.

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