Method, device and equipment for prolonging service life of power battery system and storage medium

Abstract

The invention discloses a method, a device and equipment for prolonging the service life of a power battery system and a storage medium. The method comprises the following steps: acquiring monomer voltage and temperature data of each battery monomer in the power battery system; determining a battery monomer voltage difference according to the monomer voltage, and sending a cut-off instruction to a battery management unit (BMU) when the battery monomer voltage difference is detected to be greater than a preset voltage difference threshold value, so that the BMU cuts off a target battery monomer through an analog front end (AFE); according to the method, whether the temperature of each single battery is abnormal or not is judged according to the temperature data, when the temperature is detected to be abnormal, a temperature adjusting request is sent to the VCU, and the temperature of the single battery with the abnormal temperature is adjusted, so that effective work can be ensured under the condition that the voltage platform difference of the single batteries is not large, and dual precise management and control of the state of the battery system are realized; the workload of the battery system is reduced, the energy utilization rate of the battery system is improved, and the overall service life of the battery system is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, and in particular to a method, apparatus, equipment and storage medium for extending the service life of a power battery system. Background Technology

[0002] New energy heavy trucks are high-value production materials (tools), and the battery system is the heart of new energy vehicles, accounting for more than 50% of the value of the whole vehicle. Therefore, extending the service life of the battery system is crucial.

[0003] To reduce battery maintenance and extend the service life of battery systems, developing battery maintenance devices and methods can effectively reduce customer property losses.

[0004] Currently, the main methods for extending the lifespan of battery systems on the market are: 1. Use active / passive balancing methods to avoid overcharging and over-discharging of the battery system, such as patent document CN114976316A - a battery balancing function sleep management method, system, electronic device and vehicle.

[0005] 2. Adopt a reasonable thermal management strategy to ensure that the battery system is in good working conditions and avoid overheating, such as patent document CN115042584A - a heat pump battery thermal management system, control method and vehicle.

[0006] When the differences between individual battery cells are small, methods 1 and 2 can effectively extend the life of the battery system. However, when the differences between individual cells in the power battery are large, the charging and discharging of the power battery system is limited by the lowest voltage cell, resulting in very low charging and discharging power, which makes it difficult to meet the needs of customers.

[0007] Method 1 is mainly applicable to power battery systems where the individual cell differences are not significant. For power battery systems where the individual cells have significant differences, equalization cannot extend the battery system's lifespan.

[0008] Method 2 is mainly applicable to power battery systems operating in harsh environments. For power battery systems with significant differences between individual battery cells, it is not possible to extend the battery system's lifespan by maintaining good operating conditions. Summary of the Invention

[0009] The main objective of this invention is to provide a method, apparatus, device, and storage medium for extending the service life of a power battery system. This invention aims to solve the technical problem in the prior art that for power battery systems with large differences in individual battery cells, it is impossible to extend the service life of the battery system through equalization or by maintaining good working conditions.

[0010] In a first aspect, the present invention provides a method for extending the service life of a power battery system, the method comprising the following steps: Acquire the individual cell voltage and temperature data of each battery cell in the power battery system; The battery cell voltage difference is determined based on the individual cell voltage. When the battery cell voltage difference is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE. Based on the temperature data, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

[0011] Optionally, acquiring the individual cell voltage and temperature data of each battery cell in the power battery system includes: The voltage and temperature data of each battery cell in the power battery system are collected by simulating the front-end AFE. The battery management unit (BMU) is connected to the battery exchange (AFE) to read the cell voltage and temperature data collected by the AFE.

[0012] Optionally, the step of determining the battery cell voltage difference based on the cell voltage, and sending a cut-off command to the battery management unit (BMU) when the battery cell voltage difference is detected to be greater than a preset voltage difference threshold, so that the BMU disconnects the target battery cell through the analog front-end AFE, includes: The battery management system (BMS) dynamically calculates the voltage difference between all battery cells based on the individual cell voltage. The voltage difference of the individual battery cells is compared with a preset voltage difference threshold. When the voltage difference of the individual battery cells is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) via the BMS. After receiving the cut-off command, the BMU controls the MOS transistor corresponding to the target battery cell whose voltage difference is greater than the preset voltage difference threshold to disconnect through the analog front-end AFE, so as to isolate the target battery cell from the battery system.

[0013] Optionally, after comparing the voltage difference of the individual battery cells with a preset voltage difference threshold, extending the service life of the power battery system further includes: When the voltage difference of the battery cell is detected to be greater than a preset voltage difference threshold, and the voltage difference of the battery cell is within a preset voltage difference range, an equalization command is sent to the BMU through the BMS. After the BMU receives the equalization command, it uses the AFE to consume or transfer energy between individual battery cells to achieve energy balance among them.

[0014] Optionally, the step of determining whether each battery cell has an abnormal temperature based on the temperature data, and sending a temperature adjustment request to the vehicle control unit (VCU) when an abnormal temperature is detected, to adjust the temperature of the abnormal battery cell, includes: The temperature data is compared with a preset temperature threshold to obtain a temperature comparison result. Based on the temperature comparison result, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle control unit (VCU), which in turn sends a temperature adjustment command to the thermal management system (TMS). The TMS then adjusts the temperature of the individual battery cell with the abnormal temperature.

[0015] Optionally, comparing the temperature data with a preset temperature threshold to obtain a temperature comparison result, and determining whether each battery cell has an abnormal temperature based on the temperature comparison result, includes: The temperature data is dynamically compared with a preset high temperature threshold and a preset low temperature threshold to obtain temperature comparison results; When the temperature comparison result indicates that the temperature of any battery cell is greater than the preset high temperature threshold or less than the preset low temperature threshold, the current battery cell temperature is determined to be abnormal. When the temperature comparison result indicates that the temperature of any battery is not greater than the preset high temperature threshold and not less than the preset low temperature threshold, the current battery cell temperature is determined to be normal.

[0016] Optionally, the step of sending a temperature adjustment request to the vehicle control unit (VCU) when an abnormal temperature is detected, sending a temperature adjustment command to the thermal management system (TMS) via the VCU, and adjusting the temperature of the abnormal individual battery cell via the TMS includes: When an abnormal temperature is detected as an abnormal temperature rise, a cooling request is sent to the vehicle controller (VCU) via the BMS, and a cooling command is sent to the thermal management system (TMS) via the VCU. The TMS then reduces the temperature of the abnormal individual battery cell according to the cooling command. When the temperature anomaly is detected as a temperature drop anomaly, a heating request is sent to the VCU through the BMS, a heating command is sent to the TMS through the VCU, and the TMS raises the temperature of the cell with the temperature anomaly according to the heating command.

[0017] Secondly, to achieve the above objectives, the present invention also proposes a power battery system lifespan extension device, the power battery system lifespan extension device comprising: The data acquisition module is used to acquire the individual cell voltage and temperature data of each battery cell in the power battery system; The voltage anomaly handling module is used to determine the voltage difference between battery cells based on the individual cell voltage. When the voltage difference between the battery cells is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE. The temperature anomaly handling module is used to determine whether the temperature of each battery cell is abnormal based on the temperature data. When a temperature anomaly is detected, it sends a temperature adjustment request to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

[0018] Thirdly, to achieve the above objectives, the present invention also proposes a power battery system life extension device, the power battery system life extension device comprising: a memory, a processor, and a power battery system life extension program stored in the memory and executable on the processor, the power battery system life extension program being configured to implement the steps of the power battery system life extension method as described above.

[0019] Fourthly, to achieve the above objectives, the present invention also proposes a storage medium storing a program for extending the service life of a power battery system, wherein when the program is executed by a processor, it implements the steps of the method for extending the service life of a power battery system as described above.

[0020] The proposed method for extending the service life of a power battery system involves acquiring the individual cell voltage and temperature data of each battery cell in the power battery system; determining the voltage difference between battery cells based on the individual cell voltage; and sending a cut-off command to the Battery Management Unit (BMU) when the voltage difference exceeds a preset threshold, causing the BMU to disconnect the target battery cell via the simulated front-end AFE. The method also determines whether each battery cell has an abnormal temperature based on the temperature data; and when an abnormal temperature is detected, sending a temperature adjustment request to the Vehicle Controller Unit (VCU) to adjust the temperature of the abnormal battery cell. This method ensures continued effective operation even when the voltage differences between battery cells are not significant, effectively eliminating local overcharging / over-discharging caused by voltage inconsistencies, preventing accelerated battery pack performance degradation, achieving millisecond-level precise temperature control of abnormal cells, completely avoiding the risk of thermal runaway, ensuring the safe and stable operation of the system, realizing dual precise control of the battery system state, reducing the workload of the battery system, improving the energy utilization rate of the battery system, and significantly extending the overall service life of the battery system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention; Figure 2 This is a flowchart illustrating the first embodiment of the method for extending the service life of a power battery system according to the present invention. Figure 3 This is a flowchart illustrating the second embodiment of the method for extending the service life of a power battery system according to the present invention. Figure 4 This is a flowchart illustrating the third embodiment of the method for extending the service life of a power battery system according to the present invention. Figure 5 This is a flowchart illustrating the fourth embodiment of the method for extending the service life of a power battery system according to the present invention. Figure 6 This is a schematic diagram of the control principle in the method for extending the service life of the power battery system of the present invention; Figure 7 This is a functional block diagram of the first embodiment of the power battery system life extension device of the present invention.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] The solution of this invention mainly involves: acquiring the individual cell voltage and temperature data of each battery cell in the power battery system; determining the individual cell voltage difference based on the individual cell voltage; when the individual cell voltage difference is detected to be greater than a preset voltage difference threshold, sending a cut-off command to the Battery Management Unit (BMU) so that the BMU disconnects the target battery cell through the simulated front-end AFE; determining whether each battery cell has an abnormal temperature based on the temperature data; when an abnormal temperature is detected, sending a temperature adjustment request to the Vehicle Controller (VCU) to adjust the temperature of the abnormal battery cell. This ensures continued effective operation even when the voltage platform difference between battery cells is not significant, effectively eliminating local overcharging / over-discharging caused by voltage inconsistency, avoiding accelerated performance degradation of the battery pack, achieving millisecond-level precise temperature control of abnormal cells, completely avoiding the risk of thermal runaway, ensuring the safe and stable operation of the system, realizing dual precise control of the battery system state, reducing the workload of the battery system, improving the energy utilization rate of the battery system, and significantly extending the overall service life of the battery system. This solves the technical problem in the prior art that for power battery systems with large differences in local battery cells, equalization cannot extend the battery system life, and there is no way to extend the battery system life by maintaining good working conditions.

[0025] Reference Figure 1 , Figure 1 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention.

[0026] like Figure 1As shown, the device may include: a processor 1001, such as a CPU; a communication bus 1002; a user interface 1003; a network interface 1004; and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be high-speed RAM or non-volatile memory, such as a disk drive. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0027] Those skilled in the art will understand that Figure 1 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0028] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating device, a network communication module, a user interface module, and a program for extending the lifespan of the power battery system.

[0029] The device of the present invention calls the power battery system life extension program stored in the memory 1005 through the processor 1001 and performs the following operations: Acquire the individual cell voltage and temperature data of each battery cell in the power battery system; The battery cell voltage difference is determined based on the individual cell voltage. When the battery cell voltage difference is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE. Based on the temperature data, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

[0030] The device of the present invention, through processor 1001 calling the power battery system life extension program stored in memory 1005, also performs the following operations: The voltage and temperature data of each battery cell in the power battery system are collected by simulating the front-end AFE. The battery management unit (BMU) is connected to the battery exchange (AFE) to read the cell voltage and temperature data collected by the AFE.

[0031] The device of the present invention, through processor 1001 calling the power battery system life extension program stored in memory 1005, also performs the following operations: The battery management system (BMS) dynamically calculates the voltage difference between all battery cells based on the individual cell voltage. The voltage difference of the individual battery cells is compared with a preset voltage difference threshold. When the voltage difference of the individual battery cells is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) via the BMS. After receiving the cut-off command, the BMU controls the MOS transistor corresponding to the target battery cell whose voltage difference is greater than the preset voltage difference threshold to disconnect through the analog front-end AFE, so as to isolate the target battery cell from the battery system.

[0032] The device of the present invention, through processor 1001 calling the power battery system life extension program stored in memory 1005, also performs the following operations: When the voltage difference of the battery cell is detected to be greater than a preset voltage difference threshold, and the voltage difference of the battery cell is within a preset voltage difference range, an equalization command is sent to the BMU through the BMS. After the BMU receives the equalization command, it uses the AFE to consume or transfer energy between individual battery cells to achieve energy balance among them.

[0033] The device of the present invention, through processor 1001 calling the power battery system life extension program stored in memory 1005, also performs the following operations: The temperature data is compared with a preset temperature threshold to obtain a temperature comparison result. Based on the temperature comparison result, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle control unit (VCU), which in turn sends a temperature adjustment command to the thermal management system (TMS). The TMS then adjusts the temperature of the individual battery cell with the abnormal temperature.

[0034] The device of the present invention, through processor 1001 calling the power battery system life extension program stored in memory 1005, also performs the following operations: The temperature data is dynamically compared with a preset high temperature threshold and a preset low temperature threshold to obtain temperature comparison results; When the temperature comparison result indicates that the temperature of any battery cell is greater than the preset high temperature threshold or less than the preset low temperature threshold, the current battery cell temperature is determined to be abnormal. When the temperature comparison result indicates that the temperature of any battery is not greater than the preset high temperature threshold and not less than the preset low temperature threshold, the current battery cell temperature is determined to be normal.

[0035] The device of the present invention, through processor 1001 calling the power battery system life extension program stored in memory 1005, also performs the following operations: When an abnormal temperature is detected as an abnormal temperature rise, a cooling request is sent to the vehicle controller (VCU) via the BMS, and a cooling command is sent to the thermal management system (TMS) via the VCU. The TMS then reduces the temperature of the abnormal individual battery cell according to the cooling command. When the temperature anomaly is detected as a temperature drop anomaly, a heating request is sent to the VCU through the BMS, a heating command is sent to the TMS through the VCU, and the TMS raises the temperature of the cell with the temperature anomaly according to the heating command.

[0036] This embodiment, through the above-described scheme, acquires the individual cell voltage and temperature data of each battery cell in the power battery system; determines the voltage difference between battery cells based on the individual cell voltage; when the voltage difference is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the Battery Management Unit (BMU) to cause the BMU to disconnect the target battery cell through the simulated front-end AFE; and determines whether each battery cell has an abnormal temperature based on the temperature data. When an abnormal temperature is detected, a temperature adjustment request is sent to the Vehicle Controller (VCU) to adjust the temperature of the abnormal battery cell. This ensures continued effective operation even when the voltage platform difference between battery cells is not significant, effectively eliminating local overcharging / over-discharging caused by voltage inconsistency, avoiding accelerated battery pack performance degradation, achieving millisecond-level precise temperature control of abnormal cells, completely avoiding the risk of thermal runaway, ensuring the safe and stable operation of the system, realizing dual precise control of the battery system state, reducing the workload of the battery system, improving the energy utilization rate of the battery system, and significantly extending the overall service life of the battery system.

[0037] Based on the above hardware structure, an embodiment of the method for extending the service life of the power battery system of the present invention is proposed.

[0038] Reference Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the method for extending the service life of a power battery system according to the present invention.

[0039] In the first embodiment, the method for extending the service life of the power battery system includes the following steps: Step S10: Obtain the individual cell voltage and temperature data of each battery cell in the power battery system.

[0040] It should be noted that by collecting the voltage and temperature values ​​of each individual battery cell in a power battery system (such as an electric vehicle battery pack) in real time, the individual cell voltage and temperature data of each battery cell in the power battery system can be obtained.

[0041] Step S20: Determine the battery cell voltage difference based on the cell voltage. When the battery cell voltage difference is detected to be greater than a preset voltage difference threshold, send a cut-off command to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE.

[0042] It should be understood that after obtaining the individual cell voltage of each battery cell, the voltage difference between the individual battery cells can be calculated. By comparing the individual battery cell voltage difference with a preset voltage difference threshold, when the individual battery cell voltage difference is detected to be greater than the preset voltage difference threshold, a cut-off command is sent to the Battery Management Unit (BMU), thereby causing the BMU to disconnect the target battery cell through the Analog Front End (AFE).

[0043] Understandably, the BMU uses AFE to precisely control and disconnect target battery cells with excessively large voltage differences, thereby quickly isolating abnormal cells, preventing local overcharging / over-discharging caused by voltage inconsistencies, avoiding battery pack performance degradation, and significantly improving system safety and lifespan.

[0044] Step S30: Determine whether the temperature of each battery cell is abnormal based on the temperature data. When an abnormal temperature is detected, send a temperature adjustment request to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

[0045] Understandably, the temperature data can be used to determine whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the Vehicle Control Unit (VCU) to adjust the temperature of the abnormal battery cell. This enables millisecond-level precise temperature control of the abnormal cell, completely avoiding the risk of thermal runaway and ensuring the safe and stable operation of the system.

[0046] This embodiment, through the above-described scheme, acquires the individual cell voltage and temperature data of each battery cell in the power battery system; determines the voltage difference between battery cells based on the individual cell voltage; when the voltage difference is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the Battery Management Unit (BMU) to cause the BMU to disconnect the target battery cell through the simulated front-end AFE; and determines whether each battery cell has an abnormal temperature based on the temperature data. When an abnormal temperature is detected, a temperature adjustment request is sent to the Vehicle Controller (VCU) to adjust the temperature of the abnormal battery cell. This ensures continued effective operation even when the voltage platform difference between battery cells is not significant, effectively eliminating local overcharging / over-discharging caused by voltage inconsistency, avoiding accelerated battery pack performance degradation, achieving millisecond-level precise temperature control of abnormal cells, completely avoiding the risk of thermal runaway, ensuring the safe and stable operation of the system, realizing dual precise control of the battery system state, reducing the workload of the battery system, improving the energy utilization rate of the battery system, and significantly extending the overall service life of the battery system.

[0047] Furthermore, Figure 3 This is a flowchart illustrating the second embodiment of the method for extending the service life of a power battery system according to the present invention. Figure 3 As shown, based on the first embodiment, a second embodiment of the method for extending the service life of the power battery system of the present invention is proposed. In this embodiment, step S10 specifically includes the following steps: Step S11: Collect the individual cell voltage and temperature data of each battery cell in the power battery system through the simulated front-end AFE.

[0048] It should be noted that the main function of the AFE is to collect the voltage and temperature of individual battery cells in the power system. The analog front-end AFE can collect the voltage and temperature data of each individual battery cell in the power battery system.

[0049] Step S12: Connect the battery management unit (BMU) to the battery exchange (AFE) and read the cell voltage and temperature data collected by the AFE.

[0050] It should be understood that the BMU can collect and read data from the AFE, that is, it connects to the AFE through the battery management unit (BMU) and reads the cell voltage and temperature data collected by the AFE.

[0051] This embodiment, through the above-described scheme, collects the individual cell voltage and temperature data of each battery cell in the power battery system by simulating the front-end AFE; and reads the individual cell voltage and temperature data collected by the AFE through the battery management unit (BMU). This provides the system with accurate and real-time dual-dimensional input data, reducing the battery system failure rate and providing a core data foundation for extending battery cycle life, significantly improving the safety and reliability of electric vehicle power batteries.

[0052] Furthermore, Figure 4 This is a flowchart illustrating the third embodiment of the method for extending the service life of a power battery system according to the present invention. Figure 4 As shown, based on the first embodiment, a third embodiment of the method for extending the service life of the power battery system of the present invention is proposed. In this embodiment, step S20 specifically includes the following steps: Step S21: The battery management system (BMS) dynamically calculates the voltage difference between all battery cells based on the individual cell voltage.

[0053] It should be noted that, based on the real-time voltage data of each battery cell collected by the analog front-end AFE, the Battery Management System (BMS) can dynamically calculate the voltage difference between all battery cells (i.e., the difference between the maximum and minimum voltage values).

[0054] Step S22: Compare the voltage difference of the individual battery cells with a preset voltage difference threshold.

[0055] It is understandable that by comparing the voltage difference of the individual battery cells with a preset voltage difference threshold, the corresponding voltage difference comparison result can be obtained.

[0056] Furthermore, after step S22, extending the service life of the power battery system further includes: When the voltage difference of the battery cell is detected to be greater than a preset voltage difference threshold, and the voltage difference of the battery cell is within a preset voltage difference range, an equalization command is sent to the BMU through the BMS. After the BMU receives the equalization command, it uses the AFE to consume or transfer energy between individual battery cells to achieve energy balance among them.

[0057] It should be noted that when the voltage difference between the individual battery cells is detected to be greater than a preset voltage difference threshold, but the voltage difference is within a preset voltage difference range (i.e., when the BMS controller detects a small difference in the voltage of the individual battery cells), the BMS sends a balancing command to the BMU. Upon receiving the balancing request from the BMS, the BMU sends a balancing command to the AFE (Automatic External Wire). The AFE then initiates balancing, dissipating or transferring energy from high-energy battery cells to low-energy battery cells. This controls the differences between the individual battery cells within a certain range, ensuring the power battery remains in a relatively consistent state, thereby extending the battery system's lifespan. Step S23: When the voltage difference of the battery cell is detected to be greater than the preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) via the BMS.

[0058] It should be understood that when the voltage difference of the battery cell is detected to be greater than a preset voltage difference threshold, the BMS can immediately send a cut-off command to the battery management unit (BMU).

[0059] Step S24: After the BMU receives the cut-off command, it controls the MOS transistor corresponding to the target battery cell whose voltage difference is greater than the preset voltage difference threshold to disconnect through the analog front-end AFE, so as to isolate the target battery cell from the battery system.

[0060] It should be noted that after receiving the instruction, the BMU precisely controls the metal-oxide-semiconductor field-effect transistor (MOS) corresponding to the battery cell with large differences to disconnect through the AFE, thereby isolating the battery cell from the battery system. This effectively avoids the risk of overcharging, over-discharging or thermal runaway caused by voltage inconsistency, ensures the overall stable operation of the battery system, and significantly extends the service life of the power battery.

[0061] This embodiment utilizes the above-described scheme to dynamically calculate the voltage difference between all battery cells based on the individual cell voltages. The battery cell voltage difference is then compared to a preset voltage difference threshold. When a voltage difference exceeds the threshold, the BMS sends a cut-off command to the BMU. Upon receiving the cut-off command, the BMU uses an analog front-end (AFE) to disconnect the MOSFET corresponding to the target battery cell whose voltage difference exceeds the threshold, thus isolating the target battery cell from the battery system. This effectively eliminates the risk of localized overcharging / over-discharging and significantly extends the lifespan of the power battery system.

[0062] Furthermore, Figure 5 This is a flowchart illustrating the fourth embodiment of the method for extending the service life of a power battery system according to the present invention. Figure 5 As shown, based on the first embodiment, a fourth embodiment of the method for extending the service life of the power battery system of the present invention is proposed. In this embodiment, step S30 specifically includes the following steps: Step S31: Compare the temperature data with a preset temperature threshold to obtain a temperature comparison result, and determine whether the temperature of each battery cell is abnormal based on the temperature comparison result.

[0063] It should be noted that by comparing the temperature data with the preset temperature threshold, a temperature comparison result can be obtained, and then the temperature comparison result can be used to determine whether the temperature of each battery cell is abnormal.

[0064] Furthermore, step S31 specifically includes the following steps: The temperature data is dynamically compared with a preset high temperature threshold and a preset low temperature threshold to obtain temperature comparison results; When the temperature comparison result indicates that the temperature of any battery cell is greater than the preset high temperature threshold or less than the preset low temperature threshold, the current battery cell temperature is determined to be abnormal. When the temperature comparison result indicates that the temperature of any battery is not greater than the preset high temperature threshold and not less than the preset low temperature threshold, the current battery cell temperature is determined to be normal.

[0065] Understandably, by dynamically comparing the temperature data of each battery cell with preset high-temperature thresholds (e.g., 60℃) and low-temperature thresholds (e.g., -10℃) in real time, when any cell temperature is detected to be higher than the high-temperature threshold or lower than the low-temperature threshold, the cell temperature is immediately determined to be abnormal; conversely, when the temperatures of all cells are within the normal range (not higher than the high-temperature threshold and not lower than the low-temperature threshold), the temperature is determined to be normal, thereby achieving automated and high-precision monitoring of the battery thermal state, providing a reliable basis for subsequent precise intervention by the Thermal Management System (TMS).

[0066] Step S32: When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle controller (VCU), and a temperature adjustment command is sent to the thermal management system (TMS) through the VCU. The TMS then adjusts the temperature of the individual battery cell with the abnormal temperature.

[0067] It should be understood that when an abnormal temperature is detected, a temperature adjustment request can be sent to the vehicle control unit (VCU), which in turn sends a temperature adjustment command to the thermal management system (TMS), which then adjusts the temperature of the abnormal individual battery cell.

[0068] Understandably, when the temperature of any battery cell is detected to exceed the specified range, the BMS immediately generates diagnostic information including the location of the abnormal cell, its temperature value, and the type of abnormality (overheating or overcooling). It then sends a temperature adjustment request to the vehicle controller (VCU) via the Controller Area Network (CAN) bus, triggering the vehicle thermal management system to start the cooling pump (such as liquid cooling circulation) or heating device (such as a positive temperature coefficient (PTC) heater). This achieves precise temperature control of the abnormal battery cell, avoids the risk of thermal runaway, and maintains the consistency of the battery system.

[0069] Furthermore, step S32 specifically includes the following steps: When an abnormal temperature is detected as an abnormal temperature rise, a cooling request is sent to the vehicle controller (VCU) via the BMS, and a cooling command is sent to the thermal management system (TMS) via the VCU. The TMS then reduces the temperature of the abnormal individual battery cell according to the cooling command. When the temperature anomaly is detected as a temperature drop anomaly, a heating request is sent to the VCU through the BMS, a heating command is sent to the TMS through the VCU, and the TMS raises the temperature of the cell with the temperature anomaly according to the heating command.

[0070] It should be noted that by monitoring the temperature status of individual battery cells in real time through the BMS, when an abnormal temperature increase is detected (e.g., exceeding 60°C, although other values ​​can be set, this embodiment does not impose any restrictions), the BMS immediately sends a cooling request to the Vehicle Controller (VCU). The VCU then issues a cooling command to the Thermal Management System (TMS), and the TMS activates a liquid cooling cycle or fan cooling mechanism to precisely cool the abnormal cell. When an abnormal temperature decrease is detected (e.g., below -10°C), the BMS sends a heating request to the VCU, and the VCU sends a heating command to the TMS. The TMS then rapidly heats the abnormal cell using devices such as a PTC heater, thereby achieving bidirectional dynamic control of temperature anomalies. This effectively avoids the risk of thermal runaway or low-temperature performance degradation, ensuring that the power battery system always operates within a safe temperature range (e.g., -10°C to 60°C, although other values ​​can be set, this embodiment does not impose any restrictions), significantly improving system reliability and service life.

[0071] In the specific implementation, see Figure 6 , Figure 6 This is a schematic diagram of the control principle in the method for extending the service life of the power battery system of the present invention, as shown below. Figure 6 As shown, 1 is BMU; 2 is TMS; 3 is VCU; 4 is BMS; 5 is AFE; 6 is load; 7 is battery cell; and 8 is MOSFET.

[0072] AFE5 is primarily responsible for collecting the voltage and temperature of the seven battery cells. 1BMU, by collecting and reading data from 5AFE, transmits the voltage and temperature signals of the seven battery cells to the 4BMS controller via the CAN node. When the 4BMS controller detects that the temperature of the seven battery cells is too high or too low, it sends a cooling / heating request to the 3VCU vehicle controller. Upon receiving the 4BMS request, the 3VCU sends a heating or cooling request to the 2TMS thermal management system, thereby maintaining the power system in a good operating environment and extending the battery system's lifespan.

[0073] When the 4BMS controller detects a small difference in the voltage of a single battery cell, the 4BMS sends a balancing command to the 1BMU. After receiving the balancing request from the 4BMS, the 1BMU sends a balancing command to the 5AFE, which then initiates balancing. By consuming energy from the high-energy battery cell or transferring it to the low-energy battery cell, the difference between the seven battery cells in the power battery system is controlled within a certain range, ensuring that the power battery is in a state of good consistency, thereby extending the service life of the battery system.

[0074] When the 5BMS controller detects a significant difference in the voltage of the seven battery cells, it sends a command to the 1BMU to cut off the seven battery cells that are significantly different from the others in the power battery system. After receiving the cut-off request from the 5BMS, the 1BMU sends a cut-off command to the 5AFE. The 5AFE controls the opening and closing loop of the eight MOSFETs on the two sides of the seven battery cells with significant differences, thereby cutting off the seven battery cells that are significantly different from the others in the power battery system. This ensures the consistency of the seven battery cells, maintains the good condition of the battery system, extends the service life of the battery system, avoids the need to replace the entire battery system, and brings great value to the customer.

[0075] It should be noted that the main function of the AFE is to collect the voltage and temperature of the individual battery cells in the power system. The BMU, by collecting and reading the data from the AFE, transmits the individual battery cell voltage and temperature signals to the BMS controller through the CAN node.

[0076] When the BMS controller detects that the temperature of a single battery cell is too high or too low, the BMS sends a cooling / heating request to the vehicle controller. After receiving the BMS request, the VCU sends a heating or cooling request to the thermal management system, thereby keeping the powertrain in a good working environment and extending the battery system's lifespan.

[0077] When the BMS controller detects a small difference in the voltage of a battery cell, the BMS sends an equalization command to the BMU. After receiving the equalization request from the BMS, the BMU sends an equalization command to the AFE, which then initiates equalization. By consuming or transferring energy from the high-energy battery cell to the low-energy battery cell, the difference in the battery cells of the power battery system is controlled within a certain range, ensuring that the power battery is in a state of good consistency, thereby extending the service life of the battery system.

[0078] When the BMS controller detects a significant difference in the voltage of a battery cell, the BMS sends a command to the BMU to cut off the battery cells that have a significant difference in voltage affecting the power battery system. After receiving the BMS cut-off request, the BMU sends a cut-off command to the AFE. The AFE cuts off the battery cells that have a significant difference in voltage by controlling the opening and closing of the MOSFETs on the two sides of the battery cell with significant differences, thereby ensuring the consistency of the battery cells, ensuring the good condition of the battery system, and thus extending the service life of the battery system.

[0079] It should be understood that the difference between this solution and existing solutions is that this solution can be designed to quickly detect and identify large differences in the individual cells of the battery system, and disconnect the cells with large differences through MOSFETs, thereby ensuring the stable operation of the battery system and extending the service life of the battery system.

[0080] It is understood that this embodiment, in addition to using a pure electric vehicle platform, can also be applied to a hybrid vehicle platform. When the voltage difference between individual battery cells is small, an equalization method is used to extend the battery system's lifespan. When the voltage of individual battery cells is too high or too low, a thermal management request is sent to the vehicle controller. The vehicle controller then controls the thermal management system to cool or heat the battery system according to the request, maintaining a good working environment for the battery system. When the voltage difference between individual battery cells is large, the battery cells with larger voltage differences are disconnected through MOSFETs, ensuring that the system can continue to work effectively when the voltage difference between individual battery cells is not significant, thereby extending the battery system's lifespan.

[0081] In practice, when the voltage difference between individual battery cells is small, a balancing method is used to extend the battery system's lifespan. When the voltage of individual battery cells is too high or too low, a thermal management request is sent to the vehicle controller. The vehicle controller then controls the thermal management system to cool or heat the battery system according to the request, maintaining a good working environment for the battery system. When the voltage difference between individual battery cells is large, the battery cells with larger voltage differences are disconnected through MOSFETs, ensuring that the system can continue to work effectively when the voltage difference between individual battery cells is not significant, thereby extending the battery system's lifespan.

[0082] This embodiment, through the above-described scheme, compares the temperature data with a preset temperature threshold to obtain a temperature comparison result. Based on the temperature comparison result, it determines whether each battery cell has an abnormal temperature. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle control unit (VCU). The VCU then sends a temperature adjustment command to the thermal management system (TMS). The TMS adjusts the temperature of the abnormal battery cell, ensuring continued effective operation even when the voltage platform differences between battery cells are not significant. This effectively eliminates local overcharging / over-discharging caused by voltage inconsistencies, avoids accelerated battery pack performance degradation, achieves millisecond-level precise temperature control of abnormal cells, completely avoids the risk of thermal runaway, ensures the safe and stable operation of the system, realizes dual precise control of the battery system state, reduces the workload of the battery system, improves the energy utilization rate of the battery system, and significantly extends the overall service life of the battery system.

[0083] Accordingly, the present invention further provides a device for extending the service life of a power battery system.

[0084] Reference Figure 7 , Figure 7 This is a functional block diagram of the first embodiment of the power battery system life extension device of the present invention.

[0085] In a first embodiment of the power battery system life extension device of the present invention, the power battery system life extension device includes: The data acquisition module 10 is used to acquire the individual cell voltage and temperature data of each battery cell in the power battery system.

[0086] The voltage anomaly processing module 20 is used to determine the voltage difference of the battery cells based on the individual cell voltage. When the voltage difference of the battery cells is detected to be greater than a preset voltage difference threshold, the module sends a cut-off command to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE.

[0087] The temperature anomaly handling module 30 is used to determine whether the temperature of each battery cell is abnormal based on the temperature data. When a temperature anomaly is detected, it sends a temperature adjustment request to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

[0088] The data acquisition module 10 is used to acquire the cell voltage and temperature data of each battery cell in the power battery system through the analog front-end AFE; and to read the cell voltage and temperature data acquired by the AFE through the battery management unit (BMU).

[0089] The voltage anomaly processing module 20 is further configured to dynamically calculate the voltage difference between all battery cells based on the individual cell voltage through the battery management system (BMS); compare the individual cell voltage difference with a preset voltage difference threshold; when the individual cell voltage difference is detected to be greater than the preset voltage difference threshold, send a cut-off command to the battery management unit (BMU) through the BMS; after the BMU receives the cut-off command, it controls the MOSFET corresponding to the target battery cell whose individual cell voltage difference is greater than the preset voltage difference threshold to disconnect through the analog front-end (AFE), so as to isolate the target battery cell from the battery system.

[0090] The voltage anomaly processing module 20 is further configured to send an equalization command to the BMU via the BMS when it detects that the voltage difference between the battery cells is greater than a preset voltage difference threshold and the voltage difference between the battery cells is within a preset voltage difference range; after the BMU receives the equalization command, it uses the AFE to consume or transfer energy between the battery cells so as to balance the energy of the battery cells.

[0091] The temperature anomaly processing module 30 is further configured to compare the temperature data with a preset temperature threshold to obtain a temperature comparison result, and determine whether each battery cell has a temperature anomaly based on the temperature comparison result; when a temperature anomaly is detected, a temperature adjustment request is sent to the vehicle controller (VCU), and a temperature adjustment command is sent to the thermal management system (TMS) through the VCU, and the temperature of the battery cell with the temperature anomaly is adjusted through the TMS.

[0092] The temperature anomaly processing module 30 is further configured to dynamically compare the temperature data with a preset high temperature threshold and a preset low temperature threshold respectively to obtain a temperature comparison result; when the temperature comparison result indicates that the temperature of any battery cell is greater than the preset high temperature threshold or less than the preset low temperature threshold, the current battery cell temperature is determined to be abnormal; when the temperature comparison result indicates that the temperature of any battery cell is not greater than the preset high temperature threshold and not less than the preset low temperature threshold, the current battery cell temperature is determined to be normal.

[0093] The temperature anomaly handling module 30 is further configured to, when detecting a temperature anomaly as a temperature rise anomaly, send a cooling request to the vehicle controller (VCU) via the BMS, send a cooling command to the thermal management system (TMS) via the VCU, and reduce the temperature of the abnormal individual battery cell via the TMS according to the cooling command; and when detecting a temperature anomaly as a temperature fall anomaly, send a heating request to the VCU via the BMS, send a heating command to the TMS via the VCU, and increase the temperature of the abnormal individual battery cell via the TMS according to the heating command.

[0094] The steps for implementing each functional module of the power battery system life extension device can be referred to in the various embodiments of the power battery system life extension method of the present invention, and will not be repeated here.

[0095] Furthermore, this embodiment of the invention also proposes a storage medium storing a program for extending the lifespan of a power battery system. When the program for extending the lifespan of a power battery system is executed by a processor, it performs the following operations: Acquire the individual cell voltage and temperature data of each battery cell in the power battery system; The battery cell voltage difference is determined based on the individual cell voltage. When the battery cell voltage difference is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE. Based on the temperature data, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

[0096] Furthermore, when the power battery system lifespan extension program is executed by the processor, it also performs the following operations: The voltage and temperature data of each battery cell in the power battery system are collected by simulating the front-end AFE. The battery management unit (BMU) is connected to the battery exchange (AFE) to read the cell voltage and temperature data collected by the AFE.

[0097] Furthermore, when the power battery system lifespan extension program is executed by the processor, it also performs the following operations: The battery management system (BMS) dynamically calculates the voltage difference between all battery cells based on the individual cell voltage. The voltage difference of the individual battery cells is compared with a preset voltage difference threshold. When the voltage difference of the individual battery cells is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) via the BMS. After receiving the cut-off command, the BMU controls the MOS transistor corresponding to the target battery cell whose voltage difference is greater than the preset voltage difference threshold to disconnect through the analog front-end AFE, so as to isolate the target battery cell from the battery system.

[0098] Furthermore, when the power battery system lifespan extension program is executed by the processor, it also performs the following operations: When the voltage difference of the battery cell is detected to be greater than a preset voltage difference threshold, and the voltage difference of the battery cell is within a preset voltage difference range, an equalization command is sent to the BMU through the BMS. After the BMU receives the equalization command, it uses the AFE to consume or transfer energy between individual battery cells to achieve energy balance among them.

[0099] Furthermore, when the power battery system lifespan extension program is executed by the processor, it also performs the following operations: The temperature data is compared with a preset temperature threshold to obtain a temperature comparison result. Based on the temperature comparison result, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle control unit (VCU), which in turn sends a temperature adjustment command to the thermal management system (TMS). The TMS then adjusts the temperature of the individual battery cell with the abnormal temperature.

[0100] Furthermore, when the power battery system lifespan extension program is executed by the processor, it also performs the following operations: The temperature data is dynamically compared with a preset high temperature threshold and a preset low temperature threshold to obtain temperature comparison results; When the temperature comparison result indicates that the temperature of any battery cell is greater than the preset high temperature threshold or less than the preset low temperature threshold, the current battery cell temperature is determined to be abnormal. When the temperature comparison result indicates that the temperature of any battery is not greater than the preset high temperature threshold and not less than the preset low temperature threshold, the current battery cell temperature is determined to be normal.

[0101] Furthermore, when the power battery system lifespan extension program is executed by the processor, it also performs the following operations: When an abnormal temperature is detected as an abnormal temperature rise, a cooling request is sent to the vehicle controller (VCU) via the BMS, and a cooling command is sent to the thermal management system (TMS) via the VCU. The TMS then reduces the temperature of the abnormal individual battery cell according to the cooling command. When the temperature anomaly is detected as a temperature drop anomaly, a heating request is sent to the VCU through the BMS, a heating command is sent to the TMS through the VCU, and the TMS raises the temperature of the cell with the temperature anomaly according to the heating command.

[0102] Those skilled in the art will understand that all or part of the steps in the methods described above can be implemented by a program instructing related hardware. The program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium is a computer-readable storage medium, including: USB flash drive, mobile hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and other media that can store program code.

[0103] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0104] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0105] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for extending the service life of a power battery system, characterized in that, The method for extending the service life of the power battery system includes: Acquire the individual cell voltage and temperature data of each battery cell in the power battery system; The battery cell voltage difference is determined based on the individual cell voltage. When the battery cell voltage difference is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE. Based on the temperature data, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

2. The method for extending the service life of a power battery system as described in claim 1, characterized in that, The acquisition of individual cell voltage and temperature data of each battery cell in the power battery system includes: The voltage and temperature data of each battery cell in the power battery system are collected by simulating the front-end AFE. The battery management unit (BMU) is connected to the battery exchange (AFE) to read the cell voltage and temperature data collected by the AFE.

3. The method for extending the service life of a power battery system as described in claim 1, characterized in that, The step of determining the battery cell voltage difference based on the individual cell voltage, and sending a cut-off command to the battery management unit (BMU) when the detected battery cell voltage difference exceeds a preset voltage difference threshold, so that the BMU disconnects the target battery cell via the analog front-end AFE, includes: The battery management system (BMS) dynamically calculates the voltage difference between all battery cells based on the individual cell voltage. The voltage difference of the individual battery cells is compared with a preset voltage difference threshold. When the voltage difference of the individual battery cells is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) via the BMS. After receiving the cut-off command, the BMU controls the MOS transistor corresponding to the target battery cell whose voltage difference is greater than the preset voltage difference threshold to disconnect through the analog front-end AFE, so as to isolate the target battery cell from the battery system.

4. The method for extending the service life of a power battery system as described in claim 3, characterized in that, After comparing the voltage difference of the individual battery cells with a preset voltage difference threshold, the extension of the power battery system's service life further includes: When the voltage difference of the battery cell is detected to be greater than a preset voltage difference threshold, and the voltage difference of the battery cell is within a preset voltage difference range, an equalization command is sent to the BMU through the BMS. After the BMU receives the equalization command, it uses the AFE to consume or transfer energy between individual battery cells to achieve energy balance among them.

5. The method for extending the service life of a power battery system as described in claim 1, characterized in that, The step of determining whether each battery cell has an abnormal temperature based on the temperature data, and sending a temperature adjustment request to the vehicle control unit (VCU) when an abnormal temperature is detected, to adjust the temperature of the abnormal battery cell, includes: The temperature data is compared with a preset temperature threshold to obtain a temperature comparison result. Based on the temperature comparison result, it is determined whether the temperature of each battery cell is abnormal. When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle control unit (VCU), which in turn sends a temperature adjustment command to the thermal management system (TMS). The TMS then adjusts the temperature of the individual battery cell with the abnormal temperature.

6. The method for extending the service life of a power battery system as described in claim 5, characterized in that, The step of comparing the temperature data with a preset temperature threshold to obtain a temperature comparison result, and determining whether each battery cell has an abnormal temperature based on the temperature comparison result, includes: The temperature data is dynamically compared with a preset high temperature threshold and a preset low temperature threshold to obtain temperature comparison results; When the temperature comparison result indicates that the temperature of any battery cell is greater than the preset high temperature threshold or less than the preset low temperature threshold, the current battery cell temperature is determined to be abnormal. When the temperature comparison result indicates that the temperature of any battery is not greater than the preset high temperature threshold and not less than the preset low temperature threshold, the current battery cell temperature is determined to be normal.

7. The method for extending the service life of a power battery system as described in claim 5, characterized in that, When an abnormal temperature is detected, a temperature adjustment request is sent to the vehicle control unit (VCU), and a temperature adjustment command is sent from the VCU to the thermal management system (TMS). The TMS then adjusts the temperature of the individual battery cell with the abnormal temperature, including: When an abnormal temperature is detected as an abnormal temperature rise, a cooling request is sent to the vehicle controller (VCU) via the BMS, and a cooling command is sent to the thermal management system (TMS) via the VCU. The TMS then reduces the temperature of the abnormal individual battery cell according to the cooling command. When the temperature anomaly is detected as a temperature drop anomaly, a heating request is sent to the VCU through the BMS, a heating command is sent to the TMS through the VCU, and the TMS raises the temperature of the cell with the temperature anomaly according to the heating command.

8. A device for extending the service life of a power battery system, characterized in that, The power battery system lifespan extension device includes: The data acquisition module is used to acquire the individual cell voltage and temperature data of each battery cell in the power battery system; The voltage anomaly handling module is used to determine the voltage difference between battery cells based on the individual cell voltage. When the voltage difference between the battery cells is detected to be greater than a preset voltage difference threshold, a cut-off command is sent to the battery management unit (BMU) so that the BMU disconnects the target battery cell through the analog front-end AFE. The temperature anomaly handling module is used to determine whether the temperature of each battery cell is abnormal based on the temperature data. When a temperature anomaly is detected, it sends a temperature adjustment request to the vehicle controller (VCU) to adjust the temperature of the abnormal battery cell.

9. A device for extending the service life of a power battery system, characterized in that, The power battery system life extension device includes: a memory, a processor, and a power battery system life extension program stored in the memory and executable on the processor, wherein the power battery system life extension program is configured to implement the steps of the power battery system life extension method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium stores a program for extending the service life of a power battery system. When the program is executed by a processor, it implements the steps of the method for extending the service life of a power battery system as described in any one of claims 1 to 7.

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