Method and apparatus for temperature correction of battery cells in a battery system

Abstract

The application relates to the technical field of battery temperature data processing, and provides a temperature correction method and device for battery monomers in a battery system, so as to guarantee the safe and stable operation of equipment using the battery system as much as possible. The method comprises the following steps: S1, acquiring the temperature detection value of each battery monomer in the battery system; S2, determining the temperature-abnormal battery monomer in the battery system according to the temperature detection value of each battery monomer; S3, judging whether the temperature-abnormal battery monomer in the battery system can be corrected according to the number and position relationship of the temperature-abnormal battery monomer in the battery system; S4, if the temperature-abnormal battery monomer in the battery system can be corrected, determining one adjacent battery monomer corresponding to each temperature-abnormal battery monomer; and S5, replacing the temperature detection value of the corresponding temperature-abnormal battery monomer with the temperature detection value of the adjacent battery monomer.

Description

Technical Field

[0001] This invention relates to the field of battery temperature data processing technology, and more specifically to a method and apparatus for temperature correction of individual cells in a battery system. Background Technology

[0002] In energy storage systems, electric vehicles, or other devices using battery systems and requiring battery management, a Battery Management System (BMS) can perform corresponding controls based on battery temperature to ensure the safe and reliable operation of the equipment. Battery temperature is typically acquired through a temperature acquisition circuit composed of temperature sensing elements, signal lines, connectors, and A / D (Analog / Digital) sampling circuits. However, differences in manufacturing tolerances, signal interference, and connection reliability among these components can easily lead to abnormal battery temperature acquisition data. BMS systems often cannot specifically address temperature acquisition errors caused by these hardware tolerances, resulting in false alarms and unintended shutdowns due to data acquisition errors. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a method and apparatus for temperature correction of individual battery cells in a battery system, which can ensure the safe and stable operation of equipment using battery systems as much as possible.

[0004] The technical solution adopted in this invention is as follows:

[0005] A method for temperature correction of a battery cell in a battery system includes the following steps: S1, obtaining the temperature detection value of each battery cell in the battery system; S2, determining the battery cells with abnormal temperatures in the battery system based on the temperature detection value of each battery cell; S3, determining whether the battery cells with abnormal temperatures in the battery system can be corrected based on the number and positional relationship of the battery cells with abnormal temperatures in the battery system; S4, if the battery cells with abnormal temperatures in the battery system can be corrected, determining an adjacent battery cell corresponding to each battery cell with abnormal temperatures; S5, replacing the temperature detection value of the corresponding battery cell with the temperature detection value of the adjacent battery cell.

[0006] The temperature detection value of each battery cell in the battery system is obtained through the NTC (Negative Temperature Coefficient) temperature acquisition circuit. Step S2 specifically includes: obtaining the maximum value of the temperature detection value of the battery cell in the battery system; comparing the temperature detection value of each battery cell with the maximum value; if the temperature detection value of a battery cell differs from the maximum value by more than a preset difference, then the battery cell is identified as a battery cell with abnormal temperature.

[0007] The battery cells in the battery system are numbered sequentially. Step S3 specifically includes: determining whether the number of battery cells with abnormal temperatures in the battery system has reached a threshold, and determining whether there are at least two consecutively numbered battery cells with abnormal temperatures; if the number of battery cells with abnormal temperatures in the battery system reaches the threshold, or there are at least two consecutively numbered battery cells with abnormal temperatures, then the battery cells with abnormal temperatures in the battery system are determined to be uncorrectable, and an abnormality alarm is issued; if the number of battery cells with abnormal temperatures in the battery system has not reached the threshold, and there are at least two consecutively numbered battery cells with abnormal temperatures in the battery system, then the battery cells with abnormal temperatures in the battery system are determined to be correctable.

[0008] The battery cells in the battery system form an array of M rows and N columns. The serial numbers of the battery cells in the m-th row are (m-1)×N+1 to m×N from the beginning to the end, where M and N are both integers greater than 1. Determining the adjacent battery cell corresponding to each battery cell with abnormal temperature specifically includes: if the serial number of the battery cell with abnormal temperature is i×N+1, then the serial number of its corresponding adjacent battery cell is i×N+2, where i is a natural number; if the serial number of the battery cell with abnormal temperature is i×N, then the serial number of its corresponding adjacent battery cell is i×N-1; if the serial number of the battery cell with abnormal temperature is neither i×N+1 nor i×N, then the serial number of its corresponding adjacent battery cell is the serial number of the battery cell with abnormal temperature plus one or minus one.

[0009] Before step S2, the method further includes: determining whether an over-temperature alarm is triggered based on the temperature detection value of each battery cell in the battery system; if an over-temperature alarm is triggered, issuing an over-temperature alarm message and not executing step S2; if no over-temperature alarm is triggered, executing step S2.

[0010] A temperature correction device for battery cells in a battery system includes: a temperature acquisition module for acquiring the temperature detection value of each battery cell in the battery system; an anomaly determination module for determining battery cells with abnormal temperatures in the battery system based on the temperature detection value of each battery cell; a correction judgment module for determining whether the battery cells with abnormal temperatures in the battery system can be corrected based on the number and positional relationship of the battery cells with abnormal temperatures in the battery system; an adjacency determination module for determining an adjacent battery cell corresponding to each battery cell with abnormal temperatures in the battery system when the battery cells with abnormal temperatures in the battery system can be corrected; and a replacement correction module for replacing the temperature detection value of the corresponding battery cell with the temperature detection value of the adjacent battery cell.

[0011] The temperature acquisition module acquires the temperature detection value of each battery cell in the battery system through the NTC temperature acquisition circuit. The anomaly determination module is specifically used to: acquire the maximum value of the temperature detection value of each battery cell in the battery system; compare the temperature detection value of each battery cell with the maximum value; if the temperature detection value of a battery cell differs from the maximum value by more than a preset difference, then the battery cell is determined to be a battery cell with an abnormal temperature.

[0012] The battery cells in the battery system are numbered sequentially. The correction judgment module is specifically used to: determine whether the number of battery cells with abnormal temperatures in the battery system reaches a quantity threshold, and determine whether there are at least two battery cells with consecutively ...

[0013] The battery cells in the battery system form an array of M rows and N columns. The serial numbers of the battery cells in the m-th row are (m-1)×N+1 to m×N from the beginning to the end, where M and N are both integers greater than 1. The adjacent cell determination module is specifically used to: if the serial number of the battery cell with abnormal temperature is i×N+1, then determine the serial number of its corresponding adjacent battery cell as i×N+2, where i is a natural number; if the serial number of the battery cell with abnormal temperature is i×N, then determine the serial number of its corresponding adjacent battery cell as i×N-1; if the serial number of the battery cell with abnormal temperature is neither i×N+1 nor i×N, then determine the serial number of its corresponding adjacent battery cell as the serial number of the battery cell with abnormal temperature plus one or minus one.

[0014] The temperature correction device for individual battery cells in the battery system further includes an over-temperature judgment module. The over-temperature judgment module is used to determine whether an over-temperature alarm is triggered based on the temperature detection value of each individual battery cell in the battery system. When an over-temperature alarm is triggered, an over-temperature alarm message is issued. When an over-temperature alarm is triggered, the anomaly determination module, the correction judgment module, the adjacent determination module, and the replacement correction module do not perform their functions. When no over-temperature alarm is triggered, the anomaly determination module, the correction judgment module, the adjacent determination module, and the replacement correction module perform their functions.

[0015] The beneficial effects of this invention are:

[0016] This invention identifies abnormal temperature cells based on the temperature detection value of each individual battery cell. When it is determined that an abnormal temperature cell can be corrected based on its number and location, the temperature detection value of the abnormal temperature cell is replaced with the temperature detection value of an adjacent battery cell. Thus, by correcting the temperature detection values ​​of abnormal but correctable battery cells, it can avoid abnormal temperature data acquisition caused by hardware differences, which could lead to false alarms or accidental shutdowns. Through adjacent replacement correction, it can avoid temperature monitoring blind spots, ensure the validity of temperature data, and thus ensure the safe and stable operation of equipment using battery systems as much as possible. Attached Figure Description

[0017] Figure 1 This is a flowchart of a method for temperature correction of a single battery cell in a battery system according to an embodiment of the present invention;

[0018] Figure 2 This is a flowchart of a method for temperature correction of a single cell in a battery system according to a specific embodiment of the present invention;

[0019] Figure 3 This is a block diagram of the temperature correction device for a single battery cell in a battery system according to an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, the temperature correction method for a single battery cell in the battery system of this invention includes the following steps:

[0022] S1, acquire the temperature detection value of each battery cell in the battery system.

[0023] In one embodiment of the present invention, the temperature detection value of each battery cell in the battery system can be obtained through an NTC temperature acquisition circuit, that is, the temperature sensing element of the temperature acquisition circuit is an NTC thermistor.

[0024] In one embodiment of the present invention, after obtaining the temperature detection value of each battery cell in the battery system, it can be determined whether an over-temperature alarm is triggered based on the temperature detection value of each battery cell. If an over-temperature alarm is triggered, step S2 is not executed, i.e., subsequent temperature correction is not performed, but over-temperature protection is directly implemented, such as issuing an over-temperature alarm message. If no over-temperature alarm is triggered, step S2 is executed, i.e., subsequent temperature correction is performed. This avoids over-temperature mishandling and difficulties in fault detection and location caused by erroneous correction of factual data by the temperature correction method.

[0025] S2, determine the battery cells with abnormal temperatures in the battery system based on the temperature detection value of each battery cell.

[0026] Taking the NTC temperature acquisition circuit as an example, it should be understood that hardware tolerances in the NTC temperature acquisition circuit often lead to a lower detected temperature than the actual temperature. Therefore, in one embodiment of the present invention, a battery cell with an excessively low temperature detection value can be considered as having a temperature anomaly. Specifically, the maximum temperature detection value of each battery cell in the battery system can be obtained, and the temperature detection value of each battery cell can be compared with the maximum value. If the temperature detection value of a battery cell differs from the maximum value by more than a preset difference, then that battery cell is determined to be a battery cell with a temperature anomaly.

[0027] S3, based on the number and location of battery cells with abnormal temperatures in the battery system, determine whether the battery cells with abnormal temperatures in the battery system can be corrected.

[0028] In one embodiment of the present invention, the battery cells in the battery system can be numbered sequentially, so that each battery cell has a unique corresponding serial number, and the positional relationship between the battery cells can be obtained based on the serial number.

[0029] Specifically, it can determine whether the number of battery cells with abnormal temperatures in the battery system has reached a certain threshold, and whether there are at least two consecutive battery cells with abnormal temperatures.

[0030] If the number of battery cells with abnormal temperatures in the battery system reaches a certain threshold, or if there are at least two consecutive battery cells with abnormal temperatures, then the battery cells with abnormal temperatures in the battery system are determined to be uncorrectable.

[0031] If the number of battery cells with abnormal temperatures in the battery system does not reach the quantity threshold, and there are no at least two consecutive battery cells with abnormal temperatures, then the battery cells with abnormal temperatures in the battery system are determined to be correctable.

[0032] When an abnormal temperature in a battery cell within the battery system is determined to be uncorrectable, an alarm message can be issued to detect the anomaly. Furthermore, the device using the battery system can be controlled to prevent charging and discharging or to shut down. This directly avoids potential hazards caused by widespread temperature monitoring failure.

[0033] S4, If the abnormal temperature of a battery cell in the battery system can be corrected, then determine an adjacent battery cell corresponding to each abnormal temperature battery cell.

[0034] In one embodiment of the present invention, the battery cells in the battery system form an array of M rows and N columns. The serial numbers of the battery cells in the m-th row are (m-1)×N+1 to m×N from the beginning to the end, where M and N are both integers greater than 1.

[0035] The adjacent battery cell corresponding to each battery cell with an abnormal temperature is determined by its serial number. Specifically, if the serial number of the battery cell with an abnormal temperature is i×N+1, then the serial number of its corresponding adjacent battery cell is i×N+2, where i is a natural number; if the serial number of the battery cell with an abnormal temperature is i×N, then the serial number of its corresponding adjacent battery cell is i×N-1; if the serial number of the battery cell with an abnormal temperature is neither i×N+1 nor i×N, then the serial number of its corresponding adjacent battery cell is either one plus or one minus the serial number of the battery cell with an abnormal temperature.

[0036] S5, replace the temperature detection value of the corresponding abnormal battery cell with the temperature detection value of the adjacent battery cell.

[0037] By replacing adjacent temperature detection values, the temperature detection values ​​of battery cells with abnormal temperatures are corrected.

[0038] If no abnormally sized battery cell is identified in step S2, meaning there are no abnormally sized battery cells in the battery system, or after temperature correction of the abnormally sized battery cells in step S5, the temperature detection values ​​of each battery cell in the battery system can be directly uploaded to the external control platform, or processed and then uploaded to the external control platform. For example, the temperature detection value and its sequence number of each battery cell, the maximum value of the processed temperature detection value of the battery cell and its number, the minimum value of the processed temperature detection value of the battery cell and its number, the range of the processed temperature detection values ​​of the battery cells, and various alarm information can be uploaded to the external control platform. Thus, the external control platform can accurately identify and manage over-temperature, under-temperature, and poor temperature consistency conditions in the battery system. Simultaneously, the processed data can be transmitted to the local display and control system for display and local control.

[0039] In one specific embodiment of the present invention, such as Figure 2As shown, the temperature correction method for individual cells in a battery system may include the following steps:

[0040] S201 collects the temperature detection value of each battery cell in the battery system.

[0041] S202, determine if any temperature detection value has reached the over-temperature alarm threshold. If yes, proceed to step S203; otherwise, proceed to step S204.

[0042] S203: If the first-level over-temperature alarm threshold is reached, a first-level over-temperature alarm message will be issued; if the second-level over-temperature alarm threshold is reached, a second-level over-temperature alarm message will be issued. The two over-temperature alarm thresholds are different, so the degree of over-temperature can be directly determined based on the different levels of over-temperature alarm messages.

[0043] S204, polls and calculates the temperature difference between the temperature detection value and the maximum value of all battery cells.

[0044] S205, identify battery cells with a temperature difference ≥ 20℃ as abnormal battery cells and count them.

[0045] S206, determine whether the total number of battery cells with abnormal temperature n is greater than or equal to the quantity threshold. If yes, proceed to step S207; otherwise, proceed to step S208.

[0046] S207 issues an alarm message indicating an abnormality and prohibits charging / discharging or powering off the machine.

[0047] S208, determine if two or more consecutive battery cells have abnormal temperatures. If so, proceed to step S207; otherwise, proceed to step S209, S210, or S211.

[0048] S209, when the serial number of the battery cell with abnormal temperature is 10i+1, the temperature detection value is replaced with that of 10i+2. This specific embodiment takes 10 battery cells per row as an example.

[0049] S210, when the serial number of the battery cell with abnormal temperature is 10i, replace it with the temperature detection value of 10i-1.

[0050] S211, if the serial number of the battery cell with abnormal temperature is neither 10i+1 nor 10i, replace it with any adjacent temperature detection value.

[0051] S212, Upload temperature data. The temperature data includes the serial number and temperature detection value of each battery cell, as well as the temperature detection values ​​before and after correction.

[0052] S213, saves temperature data and displays temperature data.

[0053] According to the battery system temperature correction method of the present invention, the abnormal temperature cells are identified based on the temperature detection value of each battery cell. When it is determined that the abnormal temperature cells can be corrected based on the number and positional relationship of the abnormal temperature cells, the temperature detection value of the abnormal temperature cells is replaced by the temperature detection value of the adjacent battery cells. Thus, by correcting the temperature detection values ​​of the abnormal and correctable battery cells, abnormal temperature data acquisition caused by hardware differences can be avoided, which may lead to false alarms or false shutdowns. Through adjacent replacement correction, temperature monitoring blind spots can be avoided, the validity of temperature data can be guaranteed, and the safe and stable operation of the equipment using the battery system can be guaranteed as much as possible.

[0054] Furthermore, by processing the entire process of acquiring, judging, correcting, and sending battery temperature data in one go, it requires less memory than traditional temperature sorting and caching schemes, effectively reducing the hardware requirements for processors and memory.

[0055] Corresponding to the temperature correction method for individual battery cells in the battery system described in the above embodiments, the present invention also proposes a temperature correction device for individual battery cells in a battery system.

[0056] like Figure 3 As shown, the temperature correction device for a battery cell in a battery system according to an embodiment of the present invention includes: a temperature acquisition module 10, an anomaly determination module 20, a correction judgment module 30, an adjacency determination module 40, and a replacement correction module 50. Specifically, the temperature acquisition module 10 acquires the temperature detection value of each battery cell in the battery system; the anomaly determination module 20 determines battery cells with abnormal temperatures in the battery system based on the temperature detection value of each battery cell; the correction judgment module 30 determines whether battery cells with abnormal temperatures in the battery system can be corrected based on the number and positional relationship of such battery cells; the adjacency determination module 40 determines an adjacent battery cell corresponding to each battery cell with abnormal temperatures when such cells can be corrected; and the replacement correction module 50 replaces the temperature detection value of the corresponding battery cell with the temperature detection value of the adjacent battery cell.

[0057] In one embodiment of the present invention, the temperature acquisition module 10 can acquire the temperature detection value of each battery cell in the battery system through the NTC temperature acquisition circuit, that is, the temperature sensing element of the temperature acquisition circuit is an NTC thermistor.

[0058] In one embodiment of the present invention, the temperature correction device for a single battery cell in the battery system may further include an over-temperature judgment module. The over-temperature judgment module is used to determine whether an over-temperature alarm is triggered based on the temperature detection value of each battery cell in the battery system. When an over-temperature alarm is triggered, an over-temperature alarm message can be issued. When an over-temperature alarm is triggered, the anomaly determination module 20, the correction judgment module 30, the adjacent cell determination module 40, and the replacement correction module 50 do not perform their functions. When no over-temperature alarm is triggered, the anomaly determination module 20, the correction judgment module 30, the adjacent cell determination module 40, and the replacement correction module 50 perform their functions. Therefore, it is possible to avoid over-temperature mishandling and difficulties in fault detection and location caused by erroneous correction of factual data by the temperature correction device.

[0059] It should be understood that hardware tolerances in the NTC temperature acquisition circuit often lead to a lower detected temperature than the actual temperature. Therefore, in one embodiment of the present invention, a battery cell with an excessively low temperature detection value can be considered as having a temperature anomaly. Specifically, the anomaly determination module 20 can obtain the maximum value of the temperature detection value of each battery cell in the battery system and compare the temperature detection value of each battery cell with the maximum value. If the temperature detection value of a battery cell differs from the maximum value by more than a preset difference, then the battery cell is determined to be a battery cell with a temperature anomaly.

[0060] In one embodiment of the present invention, the battery cells in the battery system can be numbered sequentially, so that each battery cell has a unique corresponding serial number, and the positional relationship between the battery cells can be obtained based on the serial number.

[0061] The correction judgment module 30 can specifically determine whether the number of battery cells with abnormal temperature in the battery system has reached the number threshold, and determine whether there are at least two battery cells with consecutive serial numbers that have abnormal temperature.

[0062] If the number of battery cells with abnormal temperatures in the battery system reaches a certain threshold, or if there are at least two consecutive battery cells with abnormal temperatures, then the battery cells with abnormal temperatures in the battery system are determined to be uncorrectable.

[0063] If the number of battery cells with abnormal temperatures in the battery system does not reach the quantity threshold, and there are no at least two consecutive battery cells with abnormal temperatures, then the battery cells with abnormal temperatures in the battery system are determined to be correctable.

[0064] When an abnormal temperature in a battery cell within the battery system is determined to be uncorrectable, an alarm message can be issued to detect the anomaly. Furthermore, the device using the battery system can be controlled to prevent charging and discharging or to shut down. This directly avoids potential hazards caused by widespread temperature monitoring failure.

[0065] In one embodiment of the present invention, the battery cells in the battery system form an array of M rows and N columns. The serial numbers of the battery cells in the m-th row are (m-1)×N+1 to m×N from the beginning to the end, where M and N are both integers greater than 1.

[0066] The adjacent battery cell corresponding to each battery cell with an abnormal temperature is determined based on its serial number. The adjacent cell determination module 40 is specifically used to: if the serial number of the battery cell with an abnormal temperature is i×N+1, then determine the serial number of its corresponding adjacent battery cell as i×N+2, where i is a natural number; if the serial number of the battery cell with an abnormal temperature is i×N, then determine the serial number of its corresponding adjacent battery cell as i×N-1; if the serial number of the battery cell with an abnormal temperature is neither i×N+1 nor i×N, then determine the serial number of its corresponding adjacent battery cell as the serial number of the battery cell with an abnormal temperature plus one or minus one.

[0067] The replacement correction module 50 corrects the temperature detection value of the battery cell with abnormal temperature by replacing adjacent temperature detection values.

[0068] If the anomaly detection module 20 fails to identify any battery cells with abnormal temperatures, meaning there are no abnormally sized battery cells in the battery system, or after the temperature correction module 50 corrects the abnormal battery cells, the temperature detection values ​​of each battery cell in the battery system can be directly uploaded to the external control platform, or processed before being uploaded. For example, the external control platform can upload the temperature detection values ​​and their serial numbers for each battery cell, the maximum value and cell number of the processed battery cell's temperature detection values, the minimum value and cell number of the processed battery cell's temperature detection values, the range of the processed battery cell's temperature detection values, and various alarm information. This allows the external control platform to accurately identify and manage over-temperature, under-temperature, and poor temperature consistency conditions in the battery system. Simultaneously, the processed data can be transmitted to the local display and control system for display and local control.

[0069] According to an embodiment of the present invention, the temperature correction device for battery cells in a battery system determines abnormal temperature cells based on the temperature detection value of each battery cell. When it is determined that an abnormal temperature cell can be corrected based on the number and positional relationship of the abnormal temperature cells, the temperature detection value of the abnormal temperature cell is replaced by the temperature detection value of an adjacent battery cell. Thus, by correcting the temperature detection values ​​of abnormal and correctable battery cells, abnormal temperature data acquisition caused by hardware differences can be avoided, which could lead to false alarms or false shutdowns. Through adjacent replacement correction, temperature monitoring blind spots can be avoided, ensuring the validity of temperature data, thereby ensuring the safe and stable operation of equipment using the battery system as much as possible.

[0070] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0071] The execution order of the steps shown in the flowchart is the preferred implementation. In other embodiments of the present invention, the order can be adjusted according to the functions involved in each step, for example, they can be executed simultaneously or in the reverse order.

[0072] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in connection with, an instruction execution system, apparatus, or device. For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit a program for use by, or in connection with, an instruction execution system, apparatus, or device.

[0073] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0074] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

Claims

1. A method for temperature correction of a single cell in a battery system, characterized in that, Includes the following steps: S1, Obtain the temperature detection value of each battery cell in the battery system; S2, determine the battery cells in the battery system with abnormal temperatures based on the temperature detection value of each battery cell; S3. Based on the number and location of the battery cells with abnormal temperatures in the battery system, determine whether the battery cells with abnormal temperatures in the battery system can be corrected. S4, if the battery cell with abnormal temperature in the battery system can be corrected, then determine an adjacent battery cell corresponding to each battery cell with abnormal temperature. S5, replace the temperature detection value of the corresponding abnormal battery cell with the temperature detection value of the adjacent battery cell.

2. The method for temperature correction of a single cell in a battery system according to claim 1, characterized in that, Step S2 specifically includes obtaining the temperature detection value of each battery cell in the battery system through the NTC temperature acquisition circuit: Obtain the maximum value of the temperature detection value of the individual battery cells in the battery system; The temperature reading of each battery cell is compared with the maximum value. If the temperature detection value of a certain battery cell differs from the maximum value by more than a preset difference, then the battery cell is identified as a battery cell with abnormal temperature.

3. The method for temperature correction of a single cell in a battery system according to claim 1, characterized in that, The individual battery cells in the battery system are numbered sequentially. Step S3 specifically includes: Determine whether the number of battery cells with abnormal temperature in the battery system reaches a number threshold, and determine whether there are at least two battery cells with consecutive serial numbers that have abnormal temperature. If the number of battery cells with abnormal temperature in the battery system reaches the number threshold, or if there are at least two consecutive battery cells with abnormal temperature, then the battery cells with abnormal temperature in the battery system are determined to be uncorrectable, and an abnormality alarm message is issued. If the number of battery cells with abnormal temperatures in the battery system does not reach the specified threshold, and there are no at least two consecutive battery cells with abnormal temperatures, then the battery cells with abnormal temperatures in the battery system are determined to be correctable.

4. The method for temperature correction of a single cell in a battery system according to claim 3, characterized in that, The battery cells in the battery system form an array of M rows and N columns. The serial numbers of the battery cells in the m-th row are (m-1)×N+1 to m×N from the beginning to the end, where M and N are both integers greater than 1. Determining the adjacent battery cell corresponding to each battery cell with an abnormal temperature specifically includes: If the serial number of the battery cell with abnormal temperature is i×N+1, then the serial number of its adjacent battery cell is i×N+2, where i is a natural number. If the serial number of the battery cell with abnormal temperature is i×N, then the serial number of its adjacent battery cell is i×N-1. If the serial number of the battery cell with abnormal temperature is neither i×N+1 nor i×N, then the serial number of its adjacent battery cell is either one plus or one minus the serial number of the battery cell with abnormal temperature.

5. The method for temperature correction of a single cell in a battery system according to claim 1, characterized in that, Before step S2, the following is also included: Determine whether to trigger an over-temperature alarm based on the temperature detection value of each battery cell in the battery system; If an over-temperature alarm is triggered, an over-temperature alarm message will be issued, and step S2 will not be executed. If no temperature alarm has been triggered, proceed to step S2.

6. A temperature correction device for a single cell in a battery system, characterized in that, include: A temperature acquisition module is used to acquire the temperature detection value of each battery cell in the battery system. An anomaly determination module is used to determine the battery cells in the battery system with abnormal temperatures based on the temperature detection value of each battery cell. The correction judgment module is used to determine whether the battery cells with abnormal temperatures in the battery system can be corrected based on the number and location relationship of the battery cells with abnormal temperatures in the battery system. The adjacent determination module is used to determine an adjacent battery cell corresponding to each battery cell with abnormal temperature when the battery cell with abnormal temperature in the battery system can be corrected. A replacement correction module is used to replace the temperature detection value of the corresponding abnormal battery cell with the temperature detection value of the adjacent battery cell.

7. The temperature correction device for a single battery cell in the battery system according to claim 6, characterized in that, The temperature acquisition module acquires the temperature detection value of each battery cell in the battery system through an NTC temperature acquisition circuit. The anomaly determination module is specifically used for: Obtain the maximum value of the temperature detection value of the individual battery cells in the battery system; The temperature reading of each battery cell is compared with the maximum value. If the temperature detection value of a certain battery cell differs from the maximum value by more than a preset difference, then the battery cell is identified as a battery cell with abnormal temperature.

8. The temperature correction device for a single battery cell in the battery system according to claim 6, characterized in that, The individual battery cells in the battery system are numbered sequentially, and the correction and judgment module is specifically used for: Determine whether the number of battery cells with abnormal temperature in the battery system reaches a number threshold, and determine whether there are at least two battery cells with consecutive serial numbers that have abnormal temperature. If the number of battery cells with abnormal temperature in the battery system reaches the number threshold, or if there are at least two consecutive battery cells with abnormal temperature, then the battery cells with abnormal temperature in the battery system are determined to be uncorrectable, and an abnormality alarm message is issued. If the number of battery cells with abnormal temperatures in the battery system does not reach the specified threshold, and there are no at least two consecutive battery cells with abnormal temperatures, then the battery cells with abnormal temperatures in the battery system are determined to be correctable.

9. The temperature correction device for a single battery cell in a battery system according to claim 8, characterized in that, The battery cells in the battery system form an array of M rows and N columns. The serial numbers of the battery cells in the m-th row are (m-1)×N+1 to m×N from the beginning to the end, where M and N are both integers greater than 1. The adjacent cell determination module is specifically used for: If the serial number of the battery cell with abnormal temperature is i×N+1, then the serial number of its corresponding adjacent battery cell is determined to be i×N+2, where i is a natural number. If the serial number of the battery cell with abnormal temperature is i×N, then the serial number of its corresponding adjacent battery cell is determined to be i×N-1. If the serial number of the battery cell with abnormal temperature is neither i×N+1 nor i×N, then the serial number of its corresponding adjacent battery cell is determined to be either the serial number of the battery cell with abnormal temperature plus one or minus one.

10. The temperature correction device for a single battery cell in a battery system according to claim 6, characterized in that, Also includes: The over-temperature judgment module is used to determine whether an over-temperature alarm is triggered based on the temperature detection value of each battery cell in the battery system. When an over-temperature alarm is triggered, an over-temperature alarm message is issued. When an over-temperature alarm is triggered, the anomaly determination module, the correction judgment module, the adjacent determination module, and the replacement correction module do not perform their functions. When no over-temperature alarm is triggered, the anomaly determination module, the correction judgment module, the adjacent determination module, and the replacement correction module perform their functions.

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