Battery management method, device, equipment and medium

Abstract

The invention discloses a battery management method and device, equipment and a medium, and the method comprises the steps: obtaining the surface temperature data of each battery cell, breaking through the limitation of conventional environment temperature equivalence or single-point detection, and precisely mastering the real temperature state of each battery cell; meanwhile, a temperature consistency adjustment strategy is executed in a key interval of high electric quantity (easy to heat and concentrate) in a charging stage and low electric quantity (easy to differentiate temperature) in a discharging stage, and temperature consistency control is intensified in a targeted manner; moreover, in a temperature consistency adjustment strategy, a means of balancing immediately after the abnormality is determined preliminarily is not adopted, but a maximum temperature difference value is used as a judgment basis for balancing operation execution, so that the frequency of the balancing operation can be effectively reduced, and the waste of energy caused by the balancing operation is reduced. According to the embodiment of the invention, the temperature difference between the battery cells can be effectively reduced, capacity attenuation acceleration and cycle life shortening caused by consistency deterioration are prevented, and the thermal runaway risk caused by local high temperature is reduced.

Description

Technical Field

[0001] This application relates to the field of two-wheeled vehicles, and in particular to a battery management method, apparatus, device, and medium. Background Technology

[0002] Current battery management solutions have significant limitations in monitoring cell temperature: they often substitute cell temperature detection with equivalent measurement of the ambient temperature inside the battery casing, or only perform single-point temperature monitoring on the cell module. Neither of these methods can accurately obtain the true temperature state of each cell, making it difficult to detect early temperature anomalies in individual or partial cells in a timely manner, and they lack specific control over the temperature consistency of multiple cells within a cell module. Over time, the temperature differences between cells will gradually widen, not only accelerating the overall battery capacity decay and shortening cycle life, but also potentially triggering thermal runaway due to locally high-temperature cells, seriously threatening battery safety. Summary of the Invention

[0003] This application aims to provide a battery management method, apparatus, device, and medium that can effectively improve the temperature consistency of the battery cells during charging and discharging.

[0004] The battery management method provided in the first aspect of this application includes: Obtain the surface temperature data of each cell in the cell module; During the charging phase, if the battery capacity of the cell module is greater than a preset high capacity threshold, a temperature consistency adjustment strategy is executed. During the discharge phase, if the battery capacity of the cell module is less than a preset low capacity threshold, the temperature consistency adjustment strategy is executed. The temperature consistency adjustment strategy includes: Determine the maximum temperature difference between the maximum and minimum values ​​of the surface temperature data of the multiple battery cells; Determine the average temperature of the surface temperature data of multiple battery cells; Determine the temperature difference between the surface temperature data of each of the battery cells and the average temperature; The battery cell whose temperature difference exceeds a preset temperature difference abnormality threshold is identified as a battery cell with temperature difference abnormality. If the maximum temperature difference exceeds a preset temperature difference equalization threshold, an equalization operation is performed on the battery cell with abnormal temperature difference.

[0005] A battery management device according to a second aspect embodiment of this application includes: The temperature acquisition module is used to acquire the surface temperature data of each cell in the cell module; The decision module is used to execute a temperature consistency adjustment strategy when the battery capacity of the cell module is greater than a preset high threshold during the charging phase, and to execute the temperature consistency adjustment strategy when the battery capacity of the cell module is less than a preset low threshold during the discharging phase. The temperature consistency adjustment strategy includes: Determine the maximum temperature difference between the maximum and minimum values ​​of the surface temperature data of the multiple battery cells; Determine the average temperature of the surface temperature data of multiple battery cells; Determine the temperature difference between the surface temperature data of each of the battery cells and the average temperature; The battery cell whose temperature difference exceeds a preset temperature difference abnormality threshold is identified as a battery cell with temperature difference abnormality. If the maximum temperature difference exceeds a preset temperature difference equalization threshold, an equalization operation is performed on the battery cell with abnormal temperature difference.

[0006] An electronic device according to a third aspect of this application includes: a processor and a memory storing computer program instructions; The processor implements the battery management method as described in the first aspect when executing computer program instructions.

[0007] A computer-readable storage medium according to a fourth aspect embodiment of the present application stores computer-executable instructions for performing the battery management method as described in the first aspect embodiment above.

[0008] The battery management method, apparatus, device, and medium of this application, by acquiring the surface temperature data of each battery cell, overcomes the limitations of traditional ambient temperature equivalence or single-point detection, and accurately grasps the true temperature state of each battery cell. Simultaneously, it focuses on the critical intervals of high charge (prone to concentrated heat generation) during charging and low charge (prone to temperature differentiation) during discharging, implementing a temperature consistency adjustment strategy to specifically strengthen temperature consistency control. Furthermore, the temperature consistency adjustment strategy does not employ an immediate equalization approach upon initial anomaly detection; instead, it uses the maximum temperature difference as the criterion for equalization operation, effectively reducing the frequency of equalization operations and minimizing energy waste. This application effectively reduces temperature differences between battery cells, prevents accelerated capacity decay and shortened cycle life due to consistency deterioration, reduces the risk of thermal runaway caused by localized high temperatures, and comprehensively improves battery safety and durability.

[0009] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this application. Attached Figure Description

[0010] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a flowchart of a battery management method according to an embodiment of this application; Figure 2 This is an electrical system diagram of the battery monitoring system according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the BMS mounting bracket according to an embodiment of this application; Figure 4 for Figure 3 A sectional view; Figure 5 for Figure 4 A diagram showing the installation of the BMS main control board and the BMS slave control board.

[0011] Figure label: Mounting plate 100; Mounting structure 101; Mounting column 102; Mounting hole 103; Side plate 200; First connecting plate 201; Cable routing structure 300; cable routing channel 301; cable fastener 302; Partition plate 400; clearance groove 401; second connecting plate 402; horizontal plate 403; vertical plate 404; connecting hole 405; BMS main control board 500; BMS slave control board 600; NTC thermistor 710; control unit 720; air pressure sensor 730; fire extinguishing device 740; alarm module 750; gas detection unit 760. Detailed Implementation

[0012] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0013] In the description of this application, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0014] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0015] In the description of this application, it should be noted that, unless otherwise explicitly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0016] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this application, not all embodiments.

[0017] like Figure 1 As shown, Figure 1 This is a flowchart of a battery management method according to an embodiment of the present application. The battery management method is applied to a control unit 720 and includes steps S100 to S300. Step S100: Obtain the surface temperature data of each cell in the cell module; Step S200: During the charging phase, if the battery capacity of the cell module is greater than a preset high capacity threshold, a temperature consistency adjustment strategy is executed. Step S300: During the discharge phase, if the battery capacity of the cell module is less than a preset low capacity threshold, the temperature consistency adjustment strategy is executed. The temperature consistency adjustment strategy includes: Determine the maximum temperature difference between the maximum and minimum values ​​of the surface temperature data of the multiple battery cells; Determine the average temperature of the surface temperature data of multiple battery cells; Determine the temperature difference between the surface temperature data of each of the battery cells and the average temperature; The battery cell whose temperature difference exceeds a preset temperature difference abnormality threshold is identified as a battery cell with temperature difference abnormality. If the maximum temperature difference exceeds a preset temperature difference equalization threshold, an equalization operation is performed on the battery cell with abnormal temperature difference.

[0018] In this embodiment, by acquiring the surface temperature data of each battery cell, the limitations of traditional ambient temperature equivalence or single-point detection are overcome, allowing for accurate understanding of the true temperature state of each cell. Simultaneously, a temperature consistency adjustment strategy is implemented focusing on the critical intervals between high charge (prone to concentrated heat generation) during charging and low charge (prone to temperature differentiation) during discharging, specifically strengthening temperature consistency control. Furthermore, instead of immediately performing equalization upon initial anomaly detection, the maximum temperature difference is used as the criterion for equalization operation, effectively reducing the frequency of equalization operations and minimizing energy waste. This embodiment effectively reduces temperature differences between cells, preventing accelerated capacity decay and shortened cycle life due to consistency deterioration, reducing the risk of thermal runaway caused by localized high temperatures, and comprehensively improving battery safety and durability.

[0019] The surface temperature data of each cell in the battery module can be obtained in real time by the control unit 720 through the NTC thermistor 710 attached to the surface of each cell in the battery module.

[0020] The maximum and minimum values ​​of the surface temperature data of the aforementioned multiple battery cells can be obtained by sorting the surface temperature data of the multiple battery cells.

[0021] The preset high battery threshold can be 60%, or it can be adjusted according to the actual situation, for example, further adjusted to 70% or 80%.

[0022] The preset low battery threshold can be 20%, or it can be adjusted according to the actual situation, such as to 15% or 25%.

[0023] The preset temperature difference equalization threshold can be 4℃, and the preset temperature difference abnormality threshold can be 3℃. The specific parameters can be set according to actual needs. Usually, the preset temperature difference equalization threshold needs to be greater than the preset temperature difference abnormality threshold.

[0024] It should be noted that after the initial determination that "the maximum temperature difference is greater than the preset temperature difference equilibrium threshold", a second determination can be made to avoid false detections caused by a single data judgment.

[0025] In some implementations, the acquisition of surface temperature data for each cell in the cell module includes: During the charging phase, the sampling frequency for acquiring the surface temperature data of each cell in the cell module is a first frequency; During the discharge phase, the sampling frequency for acquiring the surface temperature data of each cell in the cell module is the second frequency. The second frequency is less than the first frequency.

[0026] In this embodiment, considering that the charging time is relatively short, a higher first frequency can be used to accurately capture temperature anomalies that may occur in a short period of time. The discharge time is usually longer, so a lower second frequency can be used to meet the monitoring requirements, thereby achieving the goal of ensuring monitoring accuracy during critical periods while reducing management energy efficiency.

[0027] The first frequency can be 1 time / 5s, and the second frequency can be 1 time / 10s. The specific frequency can be adjusted according to actual needs.

[0028] In some embodiments, performing a balancing operation on the cells exhibiting temperature abnormalities includes: Passive balancing is performed on the battery cells exhibiting abnormal temperature differences; For each interval of equalization determination time, the temperature difference between the surface temperature data of the battery cell with abnormal temperature difference and the average temperature is determined; Determine the rate of temperature change corresponding to the changing temperature difference; Based on the rate of temperature change, the balancing current for passively balancing the battery cells with abnormal temperature differences is adjusted.

[0029] In this embodiment, the interval equalization determination time is tracked and the current is optimized according to the rate of temperature difference change. This can avoid slow equalization due to insufficient current and prevent energy waste due to excessive current. It can effectively reduce the temperature difference, quickly restore the cell temperature consistency, and improve the accuracy and efficiency of equalization.

[0030] The above balance determination time can be 5 seconds, or it can be set flexibly by yourself.

[0031] The aforementioned temperature difference can be understood as the difference between the surface temperature data and the average temperature.

[0032] The aforementioned rate of temperature change can be determined using multiple temperature differences. For example, mathematical methods can be used to fit multiple temperature differences, and then the rate of temperature change corresponding to the current temperature difference can be determined. There are many ways to determine the rate of temperature change, which will not be elaborated here.

[0033] The above-mentioned adjustment of the balancing current for passively balancing the battery cells with temperature abnormalities based on the rate of temperature difference change can be understood as follows: when the temperature difference of the battery cells with temperature abnormalities changes rapidly in the direction of decreasing, it indicates that the current balancing current is appropriate and should be maintained; when the temperature difference of the battery cells with temperature abnormalities changes slowly in the direction of decreasing, it indicates that the current balancing current is too small and the balancing current can be appropriately increased to speed up the balancing process.

[0034] In some embodiments, adjusting the balancing current for passively balancing the battery cells with temperature abnormalities based on the rate of temperature change includes: When the temperature difference change rate indicates that the temperature difference is decreasing and is greater than or equal to a preset temperature difference change rate threshold, the equalization current for passively equalizing the cells exhibiting temperature difference abnormalities is maintained; and / or, When the temperature difference change rate indicates that the temperature difference is decreasing and is less than a preset temperature difference change rate threshold, the equalization current for passively equalizing the battery cell with temperature difference abnormalities is increased. The greater the difference between the temperature difference change rate and the preset temperature difference change rate threshold, the greater the increase in the equalization current.

[0035] In this implementation, when the rate of temperature change meets the target and the temperature difference steadily decreases, maintaining the balancing current avoids unnecessary adjustments, thus stabilizing the balancing effect and reducing energy waste. When the rate of temperature change is insufficient, the current is increased in steps according to the magnitude of the rate difference, precisely matching the balancing requirements. The larger the difference, the more current is increased, which can quickly accelerate the reduction of the temperature difference. This dynamically adaptable adjustment logic balances balancing efficiency and energy conservation, making passive balancing more precise and controllable, efficiently promoting the restoration of uniform cell temperature, and improving the level of precision in battery management.

[0036] The preset temperature difference change rate threshold can be 0.2℃ / min, or it can be flexibly adjusted according to actual needs, such as further adjusting it to 0.3℃ / min or 0.5℃ / min.

[0037] In some embodiments, adjusting the balancing current for passively balancing the battery cells with temperature abnormalities based on the rate of temperature change further includes: If, within the preset equalization execution time, the maximum temperature difference exceeds the preset equalization temperature difference high threshold, an equalization invalidation alarm and a cell temperature abnormality alarm are generated; and / or, If the maximum temperature difference exceeds the preset high threshold for equalization temperature difference within the preset equalization execution time, the charging power to the battery cell module is reduced.

[0038] In this implementation, dual alarm messages for both equalization failure and abnormal cell temperature are generated. This quickly alerts management personnel, facilitating immediate troubleshooting and preventing oversights due to delayed information. Simultaneously, reducing the charging power of the cell module directly decreases the heat input to the cells, alleviating the heat stress on high-temperature cells and preventing further expansion of temperature differences between cells. The combined effect of these two measures effectively blocks the continued deterioration of abnormal temperatures after equalization failure, while also allowing sufficient time for on-site fault diagnosis and handling. This significantly reduces the risk of thermal runaway caused by excessive temperature differences, comprehensively improving the safety protection level and emergency response efficiency of the battery management system.

[0039] The aforementioned preset high threshold for equalization temperature difference can be 2℃, which is usually lower than the preset abnormal temperature difference threshold. It should be noted that after executing the temperature consistency adjustment strategy, a timer begins to accumulate until the preset equalization execution time is reached, at which point a judgment is made. The preset equalization execution time can be 15 minutes, but it can also be adaptively adjusted according to actual needs.

[0040] In some embodiments, performing the balancing operation on the battery cells with abnormal temperature differences further includes: If the maximum temperature difference is less than the preset low threshold for equalization temperature difference, the equalization operation on the battery cell with abnormal temperature difference will be stopped.

[0041] In this embodiment, the balancing process is stopped when the maximum temperature difference falls below a preset low threshold for balancing temperature difference. This allows the operation to be terminated promptly once the cell temperature difference has returned to a reasonable range. This avoids energy waste and cell damage caused by over-balancing, while also precisely controlling the timing of balancing start and stop, improving the rationality of balancing operations, and ensuring the efficiency and economy of battery management.

[0042] The preset low threshold for balanced temperature difference can be 2℃, which needs to be configured to be lower than the preset high threshold for balanced temperature difference.

[0043] In some embodiments, the battery cell module is further provided with a battery monitoring system, which includes a mounting plate 100, a wiring structure 300, a separator 400, two side plates 200, a control unit 720, and multiple NTC thermistors 710; the top and bottom surfaces of the mounting plate 100 are respectively provided with mounting structures 101, and the two mounting structures 101 are respectively used to mount the BMS main control board 500 and the BMS slave control board 600; the two side plates 200 are respectively connected to opposite sides of the mounting plate 100, and the two side plates 200 and the bottom surface of the mounting plate 100 enclose a receiving space; the wiring structure 300 is connected to the side of the mounting plate 100, and the wiring structure 300 is provided with a through wiring groove 301; the separator 400... Located below the mounting plate 100, the bottom end of the side plate 200 is bent to form a first connecting plate 201. The first connecting plate 201 is attached to the top surface of the partition 400 and connected to the partition 400 by fasteners. The partition 400 is provided with a vertically penetrating relief groove 401, and the bottom end of the wiring structure 300 passes through the relief groove 401. The control unit 720 is disposed on the BMS main control board 500 or the BMS slave control board 600. Multiple NTC thermistors 710 are disposed on the surface of different cells. Multiple NTC thermistors 710 are electrically connected to the control unit 720 through wiring through the wiring groove 301. Multiple NTC thermistors 710 are used to collect the surface temperature data of the cells.

[0044] In this embodiment, the mounting plate 100 mounts the BMS main control board 500 and the slave control board respectively through the mounting structures 101 on the top and bottom surfaces, eliminating the need for multiple additional independent mounting brackets. Combined with the accommodating space formed by the side plates 200 and the mounting plate 100, it not only greatly simplifies the overall internal structure of the battery but also efficiently saves internal installation space. The side plates 200 are firmly connected to the separator 400 through the first connecting plate 201 at the bottom, which not only improves the overall structural stability of the mounting bracket but also separates the BMS from the cell module, effectively reducing the risk of leakage. Furthermore, the wiring groove 301 of the wiring structure 300 and the clearance groove 401 of the partition 400 are mutually compatible, which not only enables the orderly wiring of multiple NTC thermistors 710, avoiding messy and tangled lines, but also eliminates the need for additional adjustments to the overall mechanical structure. At the same time, the precise contact of multiple NTC thermistors 710 with the surfaces of different battery cells allows for direct temperature measurement of multiple battery cells, effectively solving the lag problem of traditional indirect temperature detection and significantly improving temperature measurement accuracy.

[0045] The mounting plate 100 described above may have a mounting structure 101 on the top surface for mounting the BMS main control board 500, and a mounting structure 101 on the bottom surface for mounting the BMS slave control board 600.

[0046] The aforementioned space is used to accommodate the BMS board below the mounting plate 100.

[0047] The aforementioned wiring structure 300 provides wiring for the high-voltage or low-voltage lines leading out from the BMS main control board 500 and the BMS slave control board 600.

[0048] The aforementioned cable tray 301 is equipped with cable clamps 302, which are used to clamp high-voltage or low-voltage wires against the inner wall of the cable tray 301. For example, multiple cable clamps 302 can be provided in the cable tray 301, and these multiple cable clamps 302 can be arranged vertically. The cable clamps 302 in the cable tray 301 can clamp high-voltage or low-voltage wires against the inner wall of the cable tray 301, reducing the free movement of the high-voltage or low-voltage wires and making cable routing more convenient.

[0049] The aforementioned separator 400 is connected to the battery casing and located above the cell module. The first connecting plate 201 at the bottom of the side plate 200 is attached to the top surface of the separator 400 and connected to the separator 400 by fasteners. This makes it easier to install the mounting plate 100. In addition, the separator 400 can also separate the BMS system from the cell module, reducing the risk of leakage.

[0050] The aforementioned partition 400 is provided with a through-hole 401, allowing the bottom end of the wiring structure 300 to extend into the installation space of the battery cell module. This design makes it easier to route the high-voltage or low-voltage lines connecting the BMS main control board 500, the BMS slave control board 600, and the battery cell module.

[0051] The aforementioned control unit 720 can directly use the core controller of the BMS, reducing costs through reuse.

[0052] The aforementioned control unit 720 can be set independently to improve the stability of heat dissipation control.

[0053] The aforementioned control unit 720 can be made using DSP, microcontroller, ARM, etc., and specifically, the STM32 series can be selected for processing.

[0054] The aforementioned NTC thermistors 710 are used to detect the surface temperature of different cells in the battery module, thereby reducing the probability of false detection caused by detecting a single area.

[0055] In some implementations, reference Figure 4 and Figure 5 As shown, the above-mentioned wiring structure 300 may be provided with multiple wiring grooves 301, and the multiple wiring grooves 301 are arranged along the length direction of the side of the mounting plate 100 where the wiring structure 300 is provided.

[0056] In addition to being connected to each other via wiring, the BMS main control board 500 and the BMS slave control board 600 are also typically connected to the battery cell module via wiring. The BMS slave control board 600 is also connected to the battery cell module via wiring. The wiring structure 300 is provided with multiple wiring slots 301, which are arranged along the length of the side of the mounting plate 100 where the wiring structure 300 is provided. This makes it easier to route various types of wiring and makes wiring more convenient.

[0057] In some implementations, reference Figure 4 and Figure 5 As shown, the wiring structure 300 abuts against the inner wall of the relief groove 401.

[0058] In this embodiment, this configuration reduces vibration of the wiring structure 300 during vehicle operation, resulting in a more stable connection and a longer service life.

[0059] In some implementations, reference Figure 4 and Figure 5As shown, at least one cable clamp 302 in the cable tray 301 is located below the partition 400. For example, multiple cable clamps 302 may be provided in the cable tray 301, with the lowest cable clamp 302 located below the partition 400 and the remaining cable clamps 302 located above the partition 400.

[0060] In this embodiment, this configuration makes it easier to route the high-voltage or low-voltage lines connecting the BMS main control board 500, the BMS slave control board 600, and the battery cell module.

[0061] In some implementations, reference Figure 3 As shown, the partition 400 has a second connecting plate 402 on both sides opposite to each other. The second connecting plate 402 is bent outward to form a horizontal plate 403. The end of the horizontal plate 403 away from the partition 400 is bent upward to form a vertical plate 404. The vertical plate 404 is provided with a connecting hole 405.

[0062] The horizontal plate 403 can be set horizontally, the vertical plate 404 can be set vertically, and the portion of the second connecting plate 402 between the horizontal plate 403 and the partition plate 400 can be set vertically. The vertical plate 404 is provided with a connecting hole 405 and is connected to the side wall of the battery casing through the connecting hole 405 by fasteners.

[0063] In this embodiment, the partition 400 has a second connecting plate 402 on both sides opposite to each other, and the second connecting plate 402 has a bent plate structure. In this way, it can undergo elastic deformation, which not only makes it easier to connect the battery casing, but also makes it suitable for situations where there are slight errors in the size of the battery casing. In addition, it can absorb vibration energy, reduce the vibration of the BMS system, and make the BMS system have a longer service life.

[0064] In some embodiments, the battery monitoring system described above further includes: The air pressure sensor 730 is mounted on the horizontal plate 403 and is electrically connected to the control unit 720.

[0065] In this embodiment, the air pressure sensor 730 is placed on the horizontal plate 403, which can accurately capture changes in air pressure inside the battery casing. At the same time, relying on the elastic deformation characteristics of the bending structure of the second connecting plate 402, vibration can be avoided from interfering with the sensor, ensuring its detection stability. Furthermore, the sensor is electrically connected to the control unit 720, which can transmit air pressure data in real time, helping to provide timely warnings of abnormal air pressure in the casing and further improving the safety of battery use.

[0066] In some embodiments, the barometric pressure sensor 730 is disposed on the cross plate 403 near the control unit 720.

[0067] In this embodiment, the barometric pressure sensor 730 is placed on the horizontal plate 403 near the control unit 720, which can shorten the signal line distance between the sensor and the control unit 720, reduce line interference and wiring complexity; at the same time, the horizontal plate 403 relies on the elastic deformation energy of the second connecting plate 402 to buffer vibration and ensure stable sensor detection.

[0068] In some embodiments, the battery monitoring system further includes: The fire extinguishing device 740 is located inside the battery casing.

[0069] In this embodiment, by setting up a fire extinguishing device 740, fire can be extinguished when any NTC thermistor 710 detects that the cell temperature exceeds the high temperature threshold, thereby reducing the impact of the fire.

[0070] In some embodiments, the fire extinguishing device 740 includes: The thermal aerosol fire extinguisher is housed within the casing and electrically connected to the control unit 720.

[0071] In this embodiment, by setting up a thermal aerosol fire extinguisher, fire can be extinguished when any NTC thermistor 710 detects that the cell temperature exceeds the high temperature threshold, or when the pressure sensor 730 detects that the pressure inside the box exceeds the high pressure threshold.

[0072] In some embodiments, the battery monitoring system described above further includes: The alarm module 750 is electrically connected to the control unit 720.

[0073] In this embodiment, by setting the alarm module 750, proactive early warning can be achieved. Before the danger escalates, for example, when a fire just begins, the user can be promptly reminded to stay away from the two-wheeled vehicle to avoid casualties.

[0074] The aforementioned alarm module 750 can be a commercially available, mature alarm product, such as an audible and visual alarm. Alternatively, it can be a wireless communication module, which can use wireless communication to trigger an alarm. Understandably, when using a wireless communication module, it can be reused with the wireless communication module built into the battery to reduce costs.

[0075] In some embodiments, the battery monitoring system described above further includes: The gas detection unit 760 is electrically connected to the control unit 720. The gas detection unit 760 is disposed inside the housing and is used to detect the gas composition of the housing.

[0076] In this embodiment, the gas detection unit 760 can be used to detect the gas composition of the chamber, and thus can actively issue an early warning when a large amount of organic gas appears in the chamber, avoiding the problem that the temperature sensor and pressure sensor 730 cannot detect the danger in time in some low-heat slow combustion situations.

[0077] In some embodiments, two wiring structures 300 are provided, located at both ends of the same side of the mounting plate 100, and the two wiring structures 300 are respectively for high-voltage lines and low-voltage lines.

[0078] In this embodiment, the wiring structure 300 on one side is used to run high-voltage wires, i.e., circuits used to charge the cell modules of the battery pack, while the wiring structure 300 on the other side is used to run low-voltage wires, i.e. signal lines used to monitor parameters such as battery temperature. This avoids interference between high and low voltage wires, which could affect the function of the BMS system and thus the normal use of the battery.

[0079] In some embodiments, the mounting structure 101 includes a plurality of mounting posts 102 connected to the top or bottom surface of the mounting plate 100, and the end of the mounting post 102 away from the mounting plate 100 is provided with a mounting hole 103. The BMS main control board 500 and the BMS slave control board 600 are connected to the mounting posts 102 by fasteners inserted into the mounting holes 103.

[0080] refer to Figures 3 to 5 As shown, the mounting structure 101 includes multiple mounting posts 102, which not only makes it easier to install the BMS main control board 500 and the BMS slave control board 600, but also allows for a gap between the BMS main control board 500, the BMS slave control board 600 and the mounting plate 100, that is, a heat dissipation space, thereby improving the heat dissipation effect of the battery and preventing damage to the internal structure of the battery, especially the BMS system, due to high temperature.

[0081] The battery management method provided in this application can be executed by a battery management device. This application uses the execution of the battery management method by a battery management device as an example to illustrate the battery management device provided in this application.

[0082] This application embodiment also provides a battery management device, which includes: The temperature acquisition module is used to acquire the surface temperature data of each cell in the cell module; The decision module is used to execute a temperature consistency adjustment strategy when the battery capacity of the cell module is greater than a preset high threshold during the charging phase, and to execute the temperature consistency adjustment strategy when the battery capacity of the cell module is less than a preset low threshold during the discharging phase. The temperature consistency adjustment strategy includes: Determine the maximum temperature difference between the maximum and minimum values ​​of the surface temperature data of the multiple battery cells; Determine the average temperature of the surface temperature data of multiple battery cells; Determine the temperature difference between the surface temperature data of each of the battery cells and the average temperature; The battery cell whose temperature difference exceeds a preset temperature difference abnormality threshold is identified as a battery cell with temperature difference abnormality. If the maximum temperature difference exceeds a preset temperature difference equalization threshold, an equalization operation is performed on the battery cell with abnormal temperature difference.

[0083] The battery management device in this application embodiment can be an electronic device or a component within an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device, augmented reality (AR) / virtual reality (VR) device, robot, wearable device, super mobile personal computer, netbook, or personal digital assistant, etc. It can also be a server, network attached storage, personal computer, television set, ATM, or self-service machine, etc. This application embodiment does not specifically limit the device.

[0084] This application also provides an electronic device, including: a processor and a memory storing computer program instructions; the processor executes the computer program instructions to implement the battery management method as described above. The source table provided in this application can implement the various processes implemented in the above-described battery management method embodiments and achieve the same beneficial effects; to avoid repetition, it will not be described again here.

[0085] This application also provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or control module, causing the processor to perform the battery management method described in the above embodiments, for example, the method described above.

[0086] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0087] The functional blocks shown in the above structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. The programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM, floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0088] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0089] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus, and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0090] The above are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A battery management method, characterized in that, The battery management method includes: Obtain the surface temperature data of each cell in the cell module; During the charging phase, if the battery capacity of the cell module is greater than a preset high capacity threshold, a temperature consistency adjustment strategy is executed. During the discharge phase, if the battery capacity of the cell module is less than a preset low capacity threshold, the temperature consistency adjustment strategy is executed. The temperature consistency adjustment strategy includes: Determine the maximum temperature difference between the maximum and minimum values ​​of the surface temperature data of the multiple battery cells; Determine the average temperature of the surface temperature data of multiple battery cells; Determine the temperature difference between the surface temperature data of each of the battery cells and the average temperature; The battery cell whose temperature difference exceeds a preset temperature difference abnormality threshold is identified as a battery cell with temperature difference abnormality. If the maximum temperature difference exceeds a preset temperature difference equalization threshold, an equalization operation is performed on the battery cell with abnormal temperature difference.

2. The battery management method according to claim 1, characterized in that, The acquisition of surface temperature data for each cell in the cell module includes: During the charging phase, the sampling frequency for acquiring the surface temperature data of each cell in the cell module is a first frequency; During the discharge phase, the sampling frequency for acquiring the surface temperature data of each cell in the cell module is a second frequency; the second frequency is less than the first frequency.

3. The battery management method according to claim 1, characterized in that, The step of performing a balancing operation on the battery cells exhibiting abnormal temperature differences includes: Passive balancing is performed on the battery cells exhibiting abnormal temperature differences; For each interval of equalization determination time, the temperature difference between the surface temperature data of the battery cell with abnormal temperature difference and the average temperature is determined; Determine the rate of temperature change corresponding to the changing temperature difference; Based on the rate of temperature change, the balancing current for passively balancing the battery cells with abnormal temperature differences is adjusted.

4. The battery management method according to claim 3, characterized in that, The step of adjusting the balancing current for passively balancing the battery cells with temperature abnormalities based on the rate of temperature change includes: When the temperature difference change rate indicates that the temperature difference is decreasing and is greater than or equal to a preset temperature difference change rate threshold, the equalization current for passively equalizing the cells exhibiting temperature difference abnormalities is maintained; and / or, When the temperature difference change rate indicates that the temperature difference is decreasing and is less than a preset temperature difference change rate threshold, the equalization current for passively equalizing the battery cell with temperature difference abnormalities is increased. The greater the difference between the temperature difference change rate and the preset temperature difference change rate threshold, the greater the increase in the equalization current.

5. The battery management method according to claim 4, characterized in that, The step of adjusting the balancing current for passively balancing the battery cells with abnormal temperature differences based on the rate of temperature change further includes: If, within the preset equalization execution time, the maximum temperature difference exceeds the preset equalization temperature difference high threshold, an equalization invalidation alarm and a cell temperature abnormality alarm are generated; and / or, If the maximum temperature difference exceeds the preset high threshold for equalization temperature difference within the preset equalization execution time, the charging power to the battery cell module is reduced.

6. The battery management method according to claim 1, characterized in that, The step of performing a balancing operation on the battery cells with abnormal temperature differences also includes: If the maximum temperature difference is less than the preset low threshold for equalization temperature difference, the equalization operation on the battery cell with abnormal temperature difference will be stopped.

7. The battery management method according to claim 1, characterized in that, The battery cell module also includes a battery monitoring system, which comprises a mounting plate, a wiring structure, a separator, two side plates, a control unit, and multiple NTC thermistors. The mounting plate has mounting structures on its top and bottom surfaces, respectively for mounting the BMS main control board and the BMS slave control board. The two side plates are connected to opposite sides of the mounting plate, forming a receiving space between the two side plates and the bottom surface of the mounting plate. The wiring structure is connected to the side of the mounting plate and has a through-groove wiring channel. The separator is located on the mounting plate... Below the plate, the bottom end of the side plate is bent to form a first connecting plate, which is attached to the top surface of the partition and connected to the partition by fasteners; the partition has a through groove, and the bottom end of the wiring structure passes through the through groove; the control unit is set on the BMS main control board or the BMS slave control board; multiple NTC thermistors are set on the surface of different cells; multiple NTC thermistors are electrically connected to the control unit through the wiring groove; multiple NTC thermistors are used to collect the surface temperature data of the cells.

8. A battery management device, characterized in that, include: The temperature acquisition module is used to acquire the surface temperature data of each cell in the cell module; The decision module is used to execute a temperature consistency adjustment strategy when the battery capacity of the cell module is greater than a preset high threshold during the charging phase, and to execute the temperature consistency adjustment strategy when the battery capacity of the cell module is less than a preset low threshold during the discharging phase. The temperature consistency adjustment strategy includes: Determine the maximum temperature difference between the maximum and minimum values ​​of the surface temperature data of the multiple battery cells; Determine the average temperature of the surface temperature data of multiple battery cells; Determine the temperature difference between the surface temperature data of each of the battery cells and the average temperature; The battery cell whose temperature difference exceeds a preset temperature difference abnormality threshold is identified as a battery cell with temperature difference abnormality. If the maximum temperature difference exceeds a preset temperature difference equalization threshold, an equalization operation is performed on the battery cell with abnormal temperature difference.

9. An electronic device, characterized in that, The electronic device includes a processor and a memory storing computer program instructions; When the processor executes the computer program, it implements the battery management method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the battery management method as described in any one of claims 1 to 7.

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