Balancing method and device of battery cell, storage medium and electronic equipment

Abstract

The application provides a battery cell equalization method and device, a storage medium and an electronic device. The method comprises the following steps: when it is detected that a power battery pack is in a charging current drop period, determining a voltage recovery amplitude corresponding to each battery cell of the power battery pack; when it is detected that the power battery pack is charged, determining an ohmic voltage corresponding to each battery cell; after a preset time period after the power battery pack is charged, determining a relaxation voltage corresponding to each battery cell; according to the voltage recovery amplitude, the ohmic voltage and the relaxation voltage corresponding to each battery cell, determining an equalization priority score of each battery cell, and performing equalization processing on each battery cell according to the equalization priority score. The application solves the problem that the existing battery equalization scheme cannot accurately identify the battery cell power, resulting in low battery cell equalization accuracy.

Description

Technical Field

[0001] This application relates to the field of battery cell balancing technology, and more specifically, to a battery cell balancing method, apparatus, computer-readable storage medium, and electronic device. Background Technology

[0002] Power battery packs consist of dozens or even hundreds of individual battery cells connected in series and parallel. Due to factors such as manufacturing processes, material consistency, and usage environment, each individual cell naturally exhibits differences in parameters such as capacity, internal resistance, and voltage. These differences increase with charge and discharge cycles. Therefore, equalization control is crucial for power battery systems and is a core element ensuring their efficient, safe, and long-life operation. Without equalization measures, cells with higher voltages are more likely to reach the overcharge threshold first during charging, causing the entire battery pack to stop charging prematurely and not be fully charged. During discharging, cells with lower voltages trigger undervoltage protection first, causing the entire pack to disconnect power prematurely, significantly wasting the total battery capacity and affecting the device's range. Long-term imbalance will exacerbate overcharging and over-discharging of individual cells, accelerate battery aging and bulging, and even lead to safety hazards such as thermal runaway and fire.

[0003] The complex state and variable operating conditions of individual battery cells make it difficult to accurately identify true differences. Batteries exhibit polarization voltage during charging and discharging; directly collected voltages cannot reflect the true state of charge (SOC), easily leading to misjudgments and ineffective equalization. For systems like lithium iron phosphate, the change in open voltage (OCV) is minimal in the plateau region; slight voltage deviations are insufficient to correspond to actual capacity differences, making it difficult to guarantee screening accuracy.

[0004] Existing battery balancing schemes balance individual cells by measuring their terminal voltage at the end of charging and their open-circuit voltage after a preset resting time. However, the terminal voltage of each cell at the end of charging exhibits significant polarization, failing to reflect its actual state of charge (SOC) and capacity, leading to misjudgments during screening. Therefore, terminal voltage alone cannot be used for screening. Utilizing the open-circuit voltage of each cell after a preset resting time is currently the most reliable method, but it requires a long resting period (over 1 hour). In practical applications, the battery typically enters a discharge state a few minutes after charging, thus its limitations are also quite apparent. Summary of the Invention

[0005] The main objective of this application is to provide a method, apparatus, computer-readable storage medium, and electronic device for balancing individual battery cells, so as to at least solve the problem that existing battery balancing schemes are unable to accurately identify the charge level of individual battery cells, resulting in low accuracy in balancing individual battery cells.

[0006] To achieve the above objectives, according to one aspect of this application, a method for balancing individual battery cells is provided, comprising: determining the voltage rise amplitude corresponding to each battery cell in the power battery pack when the power battery pack is detected to be in a charging current reduction period; determining the ohmic voltage corresponding to each battery cell when the power battery pack is detected to be at the end of charging; determining the relaxation voltage corresponding to each battery cell after a preset time period following the end of charging; determining a balancing priority score for each battery cell based on the voltage rise amplitude, the ohmic voltage, and the relaxation voltage corresponding to each battery cell; and performing balancing processing on each battery cell based on the balancing priority score.

[0007] Optionally, determining the voltage recovery amplitude corresponding to each battery cell in the power battery pack includes: collecting the lowest voltage drop and the highest voltage recovery value of each battery cell during the charging current reduction period; and determining the voltage recovery amplitude corresponding to each battery cell based on the lowest voltage drop and the highest voltage recovery value.

[0008] Optionally, determining the ohmic voltage corresponding to each of the battery cells includes: calculating the jump voltage value of each battery cell at a preset acquisition step size after the power battery pack is fully charged, and using the jump voltage value as the ohmic voltage corresponding to the battery cell.

[0009] Optionally, determining the relaxation voltage corresponding to each of the battery cells includes: according to the first formula: Determine the relaxation voltage corresponding to each of the aforementioned battery cells, wherein, The relaxation voltage is... Open circuit voltage, This represents the amplitude of the electrochemical polarization voltage. The electrochemical polarization time constant is This represents the amplitude of the concentration polarization voltage. t is the concentration polarization time constant, and t is the resting time of the battery cell after charging is completed.

[0010] Optionally, determining the balancing priority score of each battery cell based on the voltage rise amplitude, the ohmic voltage, and the relaxation voltage of each battery cell includes: calculating a first balancing score for each battery cell based on the voltage rise amplitude, calculating a second balancing score for each battery cell based on the ohmic voltage, and calculating a third balancing score for each battery cell based on the relaxation voltage; and determining the balancing priority score of each battery cell based on the first balancing score, the second balancing score, and the third balancing score.

[0011] Optionally, calculating a first balancing score for each battery cell based on the voltage rise amplitude, a second balancing score for each battery cell based on the ohmic voltage, and a third balancing score for each battery cell based on the relaxation voltage includes: according to a second formula: Calculate the first equalization score corresponding to each of the battery cells, where, This is the first equilibrium score. This represents the average voltage recovery rate of a single battery cell. The voltage recovery amplitude, For voltage limits; according to the third formula: Calculate the second equalization score corresponding to each of the battery cells, wherein, This is the second equilibrium score. This represents the average ohmic voltage of a single battery cell. The ohmic voltage, Ohmic voltage limit; according to formula four: Calculate the third equalization score corresponding to each of the aforementioned battery cells. The third equilibrium score, This represents the average open-circuit voltage of a single battery cell. The relaxation voltage is... Open-circuit voltage limit.

[0012] Optionally, a balancing priority score is determined for each of the battery cells, and balancing processing is performed on each of the battery cells according to the balancing priority score, including: according to the fifth formula: Determine the balanced priority score for each of the aforementioned battery cells, wherein, The balanced priority score, This is the first equilibrium score. This is the second equilibrium score. The third equilibrium score, , , The weighting coefficient is used to perform forced balancing on battery cells whose balancing priority score is greater than or equal to the first preset score, recommended balancing on battery cells whose balancing priority score is less than the first preset score but greater than or equal to the second preset score, and no balancing on battery cells whose balancing priority score is less than the second preset score, wherein the first preset score is greater than the second preset score.

[0013] According to another aspect of this application, a battery cell balancing device is provided, comprising: a first determining unit, configured to determine the voltage rise amplitude corresponding to each battery cell of the power battery pack when the power battery pack is detected to be in a charging current reduction period; a second determining unit, configured to determine the ohmic voltage corresponding to each battery cell when the power battery pack is detected to be at the end of charging; a third determining unit, configured to determine the relaxation voltage corresponding to each battery cell after a preset time period following the end of charging of the power battery pack; and a balancing processing unit, configured to determine a balancing priority score for each battery cell based on the voltage rise amplitude, the ohmic voltage, and the relaxation voltage corresponding to each battery cell, and to perform balancing processing on each battery cell based on the balancing priority score.

[0014] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the battery cell equalization methods described above.

[0015] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing equalization of any of the battery cells described above.

[0016] This application utilizes a technical solution that dynamically collects the voltage rise, ohmic voltage, and relaxation voltage of each battery cell during the charging current reduction period, at the moment of charging completion, and during the post-charging relaxation phase of the power battery pack, and comprehensively evaluates the balancing priority of each battery cell. Compared to existing technologies that rely solely on the charging end voltage or the open-circuit voltage after resting, this solution uses the transient voltage rise during the charging current reduction phase to reflect internal resistance differences, utilizes the voltage jump at the moment of charging completion to extract ohmic polarization characteristics, and uses the relaxation voltage to calculate the true open-circuit voltage. These three complementary methods avoid the problem of misjudgment based on a single indicator. Especially in scenarios where voltage changes are weak in the lithium iron phosphate platform region, traditional methods are prone to failure, while this solution significantly improves the accuracy of identifying cells with capacity decay and internal resistance degradation through multi-dimensional time-domain feature fusion. This solves the problem that existing battery balancing schemes struggle to accurately identify the charge level of individual battery cells, resulting in low accuracy in battery cell balancing. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1A hardware structure block diagram of a mobile terminal performing a battery cell balancing method according to an embodiment of this application is shown.

[0019] Figure 2 A schematic flowchart of a battery cell balancing method according to an embodiment of this application is shown.

[0020] Figure 3 A flowchart illustrating a specific battery cell balancing method provided according to an embodiment of this application is shown.

[0021] Figure 4 A schematic diagram of segmented current reduction in a single battery cell at the end of charging, according to an embodiment of this application, is shown.

[0022] Figure 5 The voltage of each cell in the battery cell provided according to an embodiment of this application after the last current reduction is shown.

[0023] Figure 6 A schematic diagram showing the instantaneous voltage drop of each cell after charging is completed, according to an embodiment of this application;

[0024] Figure 7 A schematic diagram showing the change in relaxation voltage after charging is completed, according to an embodiment of this application, is shown.

[0025] Figure 8 A structural block diagram of a battery cell balancing device provided according to an embodiment of this application is shown. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0030] Relaxation voltage: The dynamic voltage of a power battery as its open-circuit voltage gradually stabilizes after the charging or discharging current is interrupted. Simply put, when charging or discharging stops, the battery voltage does not stabilize instantly but undergoes a slow change; the voltage value during this process is the relaxation voltage.

[0031] Electrochemical polarization: caused by the electrochemical reaction rate at the positive and negative electrodes being less than the electron movement rate.

[0032] Concentration polarization: caused by the diffusion rate of lithium ions in the solid phase being less than the electrochemical reaction rate.

[0033] OCV: Open Circuit Voltage, is the voltage measured after a battery has been left to electrochemical equilibrium after being opened up. It is the thermodynamic equilibrium potential difference of the electrode materials.

[0034] As described in the background section, existing battery balancing schemes have difficulty accurately identifying the charge level of individual battery cells, resulting in low accuracy in battery cell balancing. To address the problem of existing battery balancing schemes failing to accurately identify the charge level of individual battery cells, resulting in low accuracy in battery cell balancing, embodiments of this application provide a battery cell balancing method, apparatus, computer-readable storage medium, and electronic device.

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a battery cell balancing method according to an embodiment of the present invention. Figure 1As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0037] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the battery cell balancing method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0038] This embodiment provides a method for balancing battery cells that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0039] Figure 2 This is a flowchart of a battery cell balancing method according to an embodiment of this application. Figure 2As shown, the method includes the following steps:

[0040] Step S201: When the power battery pack is detected to be in the charging current reduction period, determine the voltage recovery range of each battery cell in the power battery pack.

[0041] Step S202: Upon detecting the end of charging of the aforementioned power battery pack, determine the ohmic voltage corresponding to each of the aforementioned battery cells.

[0042] Step S203: After a preset time period following the completion of charging of the aforementioned power battery pack, determine the relaxation voltage corresponding to each of the aforementioned battery cells.

[0043] Step S204: Based on the voltage rise amplitude, ohmic voltage and relaxation voltage of each of the aforementioned battery cells, determine the balancing priority score of each of the aforementioned battery cells, and perform balancing processing on each of the aforementioned battery cells according to the balancing priority score.

[0044] This embodiment utilizes steps S201, S202, S203, and S204 to dynamically collect the voltage rise, ohmic voltage, and relaxation voltage of each battery cell during the charging current reduction period, at the moment of charging completion, and during the post-charging relaxation phase. The balancing priority of each battery cell is then comprehensively evaluated. Compared to existing technologies that rely solely on the charging end voltage or the open-circuit voltage after resting, this solution uses the transient voltage rise during the charging current reduction phase to reflect internal resistance differences, utilizes the voltage jump at the moment of charging completion to extract ohmic polarization characteristics, and uses the relaxation voltage to calculate the true open-circuit voltage. These three complementary methods avoid the problem of misjudgment based on a single indicator. Especially in scenarios where voltage changes are weak in the lithium iron phosphate platform region, traditional methods are prone to failure. This solution, through multi-dimensional time-domain feature fusion, significantly improves the accuracy of identifying cells with capacity decay and internal resistance degradation. This solves the problem of existing battery balancing schemes failing to accurately identify the battery cell capacity, resulting in low accuracy in battery cell balancing.

[0045] In the specific implementation process, the voltage recovery range corresponding to each battery cell of the power battery pack is determined, including: collecting the minimum voltage drop and the maximum voltage recovery value of each battery cell during the charging current reduction period; and determining the voltage recovery range corresponding to each battery cell based on the minimum voltage drop and the maximum voltage recovery value.

[0046] In this embodiment, the lowest valley and peak voltage of each cell during the charging current reduction process are accurately collected, and the difference is calculated as the voltage recovery amplitude, directly quantifying the polarization response capability of the cell under sudden current changes. This solution requires no additional sensors or complex algorithms, and can be implemented using only the existing voltage sampling channel of the BMS, resulting in low engineering implementation costs. Since the voltage recovery amplitude is positively correlated with the internal resistance, this quantitative indicator can effectively distinguish cells with abnormal internal resistance caused by material aging or poor welding. Compared with screening using only absolute voltage values, it can reduce the false positive rate, and is especially suitable for scenarios with severe polarization superposition under fast charging conditions. It provides a high signal-to-noise ratio input for subsequent equalization strategies, significantly improving system reliability.

[0047] Specifically, determining the ohmic voltage corresponding to each of the aforementioned battery cells includes: calculating the jump voltage value of each of the aforementioned battery cells at a preset acquisition step size after the power battery pack is fully charged, and using the jump voltage value as the ohmic voltage corresponding to the aforementioned battery cell.

[0048] In this embodiment, the instantaneous voltage jump of a single cell within milliseconds after charging is completed is measured as the ohmic voltage, accurately capturing the characteristic of the instantaneous disappearance of ohmic polarization. This scheme overcomes the shortcomings of traditional methods that require several hours of power-off and static storage to obtain internal resistance, achieving real-time online detection. The jump value is linearly related to ohmic loss; this indicator can quickly screen out high-internal-resistance "degraded cells," preventing them from becoming factors of thermal runaway in subsequent cycles. Compared to traditional offline detection with internal resistance testers, this method is integrated into the BMS operation process, achieving "diagnosis while charging," significantly shortening the detection cycle and improving management efficiency.

[0049] More specifically, determining the relaxation voltage corresponding to each of the aforementioned battery cells includes: according to the first formula: Determine the relaxation voltage corresponding to each of the above-mentioned battery cells, wherein, The relaxation voltage mentioned above, Open circuit voltage, This represents the amplitude of the electrochemical polarization voltage. The electrochemical polarization time constant is This represents the amplitude of the concentration polarization voltage. t is the concentration polarization time constant, and t is the resting time of the above-mentioned battery cells after charging is completed.

[0050] In this embodiment, a mathematical model of the relaxation voltage after charging is performed using the first formula. The parameters are fitted using the least squares method to calculate an estimated value close to the true open-circuit voltage (OCV). This method addresses the industry pain point of lithium iron phosphate batteries struggling to obtain a stable OCV during short rest periods (<30 min), avoiding SOC estimation errors and incorrect equalization due to insufficient rest time. Compared to using only the voltage after rest or linear extrapolation, this model has a clear physical meaning, can separate the contributions of electrochemical polarization and concentration polarization, and significantly improves the accuracy of equalization triggering based on OCV. This scheme reduces the rest time of individual battery cells after charging; with a shorter rest time, the relaxation voltage of each battery cell can be derived using the first formula.

[0051] Further, based on the voltage rise amplitude, ohmic voltage, and relaxation voltage corresponding to each of the aforementioned battery cells, the equalization priority score of each of the aforementioned battery cells is determined, including: calculating a first equalization score corresponding to each of the aforementioned battery cells based on the voltage rise amplitude, calculating a second equalization score corresponding to each of the aforementioned battery cells based on the ohmic voltage, and calculating a third equalization score corresponding to each of the aforementioned battery cells based on the relaxation voltage; and determining the equalization priority score of each of the aforementioned battery cells based on the first equalization score, the second equalization score, and the third equalization score.

[0052] In this embodiment, a three-dimensional independent scoring mechanism of "voltage recovery amplitude—ohmic voltage—relaxation voltage" is constructed to quantify the differences of the battery at three physical levels: current disturbance response, internal resistance characteristics, and thermodynamic equilibrium state. This avoids misjudgment caused by a single indicator due to operating condition interference (such as sudden temperature changes or current fluctuations). This hierarchical scoring mechanism has strong robustness; even if one indicator is affected by noise, the other two can still provide valid judgment criteria. Through independent calculation, attribution analysis can be performed on different failure modes (such as increased internal resistance, capacity decay, and abnormal self-discharge), providing the BMS with multi-dimensional health diagnosis capabilities and significantly improving the safety redundancy and operating efficiency of the battery system.

[0053] Furthermore, the calculation of a first equalization score for each of the aforementioned battery cells based on the aforementioned voltage rise magnitude, a second equalization score for each of the aforementioned battery cells based on the aforementioned ohmic voltage, and a third equalization score for each of the aforementioned battery cells based on the aforementioned relaxation voltage, includes: according to the second formula: Calculate the first equilibrium score corresponding to each of the aforementioned battery cells, where, For the first equilibrium fraction mentioned above, This represents the average voltage recovery rate of a single battery cell. For the voltage recovery range mentioned above, For voltage limits; according to the third formula: Calculate the second equilibrium score corresponding to each of the aforementioned battery cells, where, This is the second equilibrium score mentioned above. This represents the average ohmic voltage of a single battery cell. For the above ohmic voltage, Ohmic voltage limit; according to formula four: Calculate the third equilibrium score corresponding to each of the aforementioned battery cells. The third equilibrium fraction mentioned above, This represents the average open-circuit voltage of a single battery cell. The relaxation voltage mentioned above, Open-circuit voltage limit.

[0054] In this embodiment, a standardized normalization formula is used to transform the three types of voltage characteristics into dimensionless balanced scores, achieving unified quantitative comparison of parameters with different dimensions and physical meanings. This method uses the mean as a benchmark and a preset threshold as the normalization scale, ensuring the comparability and interpretability of scores for each individual cell and avoiding score drift caused by the expansion of battery pack size. The formula design considers the characteristics of the population distribution (such as eliminating the influence of extreme values), ensuring a reasonable score distribution and a clear gradient, providing a high signal-to-noise ratio input for subsequent weighted fusion.

[0055] Specifically, the equalization priority score of each of the aforementioned battery cells is determined, and equalization processing is performed on each of the aforementioned battery cells according to the aforementioned equalization priority score, including: according to the fifth formula: Determine the balanced priority score for each of the aforementioned battery cells, where, For the above-mentioned balanced priority scores, For the first equilibrium fraction mentioned above, This is the second equilibrium score mentioned above. The third equilibrium fraction mentioned above, , , The weighting coefficient is used to perform forced balancing on battery cells whose balance priority score is greater than or equal to the first preset score, recommended balancing on battery cells whose balance priority score is less than the first preset score but greater than or equal to the second preset score, and no balancing on battery cells whose balance priority score is less than the second preset score, wherein the first preset score is greater than the second preset score.

[0056] The weighting coefficients can be set as follows: =20% =20% =60%.

[0057] In this embodiment, the three types of scores are weighted and fused to construct a comprehensive balanced priority score. A three-tiered strategy is set: forced balanced (≥80 points), recommended balanced (50–80 points), and unbalanced (<50 points) to achieve intelligent allocation of balanced resources. This mechanism fully considers the high reliability of relaxation voltage estimation of OCV (α3=60%) and the auxiliary diagnostic value of voltage recovery and ohmic voltage (α1=α2=20%), avoiding energy waste and thermal management pressure caused by "over-balancing". Through tiered response, the system can improve the overall vehicle energy efficiency while ensuring the safety of key individual components.

[0058] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the battery cell balancing method of this application will be described in detail below with reference to specific embodiments.

[0059] This embodiment relates to a specific method for balancing individual battery cells. Different cell balancing selection rules are established based on "the voltage recovery rate of each cell after segmented current reduction in the later stages of charging," "the ohmic voltage of each cell after charging," and "the open-circuit voltage estimated based on the relaxation curve after charging." The balancing priority score is then calculated based on the difference between the selected cells and the established criteria. Finally, the reliability of each selection rule is multiplied by a different reliability weighting factor to obtain the final balancing priority score for each cell. This method avoids misjudgments and ineffective balancing, significantly improving the accuracy of battery balancing selection.

[0060] Figure 3 For specific battery cell balancing methods, such as Figure 3 As shown, it specifically includes the following:

[0061] At the end of the charging process, a current correction factor is obtained based on the battery's SOC and temperature. If the battery SOC exceeds a limit of 1 (e.g., 90%), the charging current is reduced from 1C (e.g., 200A) to 0.75C (e.g., 150A). If the battery SOC exceeds a limit of 1 (e.g., 95%), the charging current is reduced from 0.75C (e.g., 150A) to 0.5C (e.g., 100A), until the battery is fully charged. It can be seen that after each current reduction, the voltage of each individual cell first decreases and then increases. Cells with a larger voltage rebound have higher internal resistance and poorer consistency. Therefore, the voltage rebound of individual cells after the final current reduction should exceed a certain limit. (e.g., 60mV) is used as the screening criterion for the cells to be balanced. Among these, the current reduction of the battery cells in stages at the end of charging is as follows: Figure 4 As shown.

[0062] Figure 5 for Figure 4 A schematic diagram showing the voltage changes of each cell after the last charge current reduction, as shown below. Figure 5As shown, the lowest voltage drop of each individual cell after current reduction was collected. The voltage rises back to its highest value at the end of charging. Calculate the difference between the highest and lowest voltage values ​​for each individual unit. , This refers to the voltage recovery rate of each individual cell after the current reduction. The voltage recovery rate of each individual cell must exceed a certain limit. The battery cells are assigned priority based on the following formula: ,in, This represents the average recovery rate of the voltage of each individual unit.

[0063] Figure 6 This diagram illustrates the instantaneous voltage drop of each cell after charging. Ohmic polarization disappears instantly (on the order of milliseconds) after charging. The greater the change in ohmic voltage, the greater the battery's internal resistance. Therefore, this ohmic voltage can be exceeded by a certain limit. (e.g., 25mV) is used as the screening criterion for the cells to be equalized. The voltage jump value of each cell within one acquisition step is calculated after charging is completed. This refers to the ohmic voltage of each individual battery cell. The ohmic voltage exceeding a certain limit after charging is complete. The battery cells are assigned priority based on the following formula: , This represents the average ohmic voltage of each cell after charging is complete.

[0064] Figure 7 This diagram illustrates the change in relaxation voltage after charging. After the charging current ends, the relaxation voltage of the power battery gradually approaches the open-circuit voltage. In practical applications, if the battery is left to rest for a relatively long time after charging (e.g., more than 30 minutes), the relaxation voltage after resting is taken as the open-circuit voltage. If the battery is left to rest for a relatively short time after charging (e.g., less than 30 minutes), the following formula for estimating the relaxation voltage of each individual cell is used to estimate the open-circuit voltage of each cell.

[0065] The formula for calculating the relaxation voltage of a single cell is as follows: ;

[0066] In the above formula, It is the relaxation voltage. This is the open-circuit voltage; The ohmic polarization voltage disappears instantaneously (in milliseconds) after charging stops. This represents the amplitude of the electrochemical polarization voltage. The electrochemical polarization time constant is The resting time after charging is completed; the electrochemical polarization voltage disappears rapidly (on the order of seconds) after charging is stopped. This represents the amplitude of the concentration polarization voltage. The concentration polarization time constant is the concentration polarization voltage that slowly disappears (from minutes to hours) after charging stops. The lithium ion concentration gradient inside the positive and negative electrodes and in the electrolyte diffuses slowly and evenly, which is the main cause of the relaxation voltage curve.

[0067] Ohmic polarization voltage After stopping charging and discharging When the value is 0, the formula for calculating the relaxation voltage of a single cell simplifies to: ;

[0068] Construct the residual function: , The individual cell voltage measurement values ​​during the resting period T1 after charging (to ensure estimation accuracy, this time should be greater than a certain time, such as 3 minutes) are obtained through the residual function. The value of determines the accuracy of the individual relaxation voltage calculation, where the residual function The closer the value is to 0, the higher the accuracy of the relaxation voltage calculation.

[0069] Parameter vector: In Python, the scipy.least_squares module can be used to perform least-squares parameter fitting to obtain the parameters. , , , , The individual cell relaxation voltage at a certain point T2 (e.g., 30 min, T2>T1) after charging stops can be estimated using the formula for calculating the individual cell relaxation voltage. This relaxation voltage can then be approximated as the individual cell open-circuit voltage. The voltage difference between each individual cell's open-circuit voltage and the minimum open-circuit voltage is set to a value greater than a certain limit. (e.g., 50mV) is used as a screening criterion for the individual cells to be balanced. The open-circuit voltage of a single cell must exceed a certain limit. The battery cells are assigned priority based on the following formula: In the above formula, This represents the average open-circuit voltage of each individual cell.

[0070] Assign a score to each of the three balanced individual selection schemes calculated above. , , Each score is adjusted by adding a certain offset to ensure that all scores are positive, and then discretized between 1 and 100 points to obtain... , , Since the three balanced individual screening rules have inconsistent reliability, they are then multiplied by their respective reliability weighting factors. (e.g., 20%) (e.g., 20%) (e.g., 60%). The final equilibrium priority scores for each individual entity are: ;

[0071] This allows us to obtain a segmented balanced priority based on the final score, such as Forced equilibrium for single units with scores greater than 80. For individual samples with scores greater than 50 but less than 80, balancing is recommended; for individual samples with scores less than 50, balancing is not required.

[0072] This application's embodiments formulate equalization battery cell screening rules based on factors such as "the recovery range of each cell's voltage after segmented current reduction in the later stages of charging," "the ohmic voltage of each battery cell after charging," and "the open-circuit voltage estimated based on the relaxation curve after charging." The equalization priority score is then calculated based on the difference between the selected battery cells and the screening criteria. Finally, the confidence level of each screening rule is multiplied by different confidence weighting factors to obtain the final equalization priority score for each cell. This method avoids misjudgments and ineffective equalization, significantly improving the accuracy of equalization battery screening.

[0073] This application also provides a battery cell equalization device. It should be noted that the battery cell equalization device of this application can be used to execute the battery cell equalization method provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0074] The following describes the equalization device for a single battery cell provided in the embodiments of this application.

[0075] Figure 8 This is a schematic diagram of a battery cell balancing device according to an embodiment of this application. Figure 8 As shown, the device includes:

[0076] The first determining unit 81 is used to determine the voltage recovery amplitude of each battery cell in the power battery pack when the power battery pack is detected to be in a charging current reduction period.

[0077] The second determining unit 82 is used to determine the ohmic voltage corresponding to each of the above-mentioned battery cells when the power battery pack is detected to be finished charging.

[0078] The third determining unit 83 is used to determine the relaxation voltage of each of the above-mentioned battery cells after a preset time period following the end of charging of the above-mentioned power battery pack.

[0079] The equalization processing unit 84 is used to determine the equalization priority score of each battery cell based on the voltage rise amplitude, ohmic voltage and relaxation voltage corresponding to each battery cell, and to perform equalization processing on each battery cell based on the equalization priority score.

[0080] In this embodiment, the first determining unit is used to determine the voltage rise amplitude of each battery cell in the power battery pack when the power battery pack is detected to be in the charging current reduction period; the second determining unit is used to determine the ohmic voltage of each battery cell when the power battery pack is detected to be at the end of charging; the third determining unit is used to determine the relaxation voltage of each battery cell after a preset time period after the power battery pack ends charging; and the equalization processing unit is used to determine the equalization priority score of each battery cell based on the voltage rise amplitude, ohmic voltage, and relaxation voltage of each battery cell, and to perform equalization processing on each battery cell based on the equalization priority score. By dynamically collecting the voltage rise amplitude, ohmic voltage, and relaxation voltage of each battery cell during the charging current reduction period, at the moment of charging end, and during the relaxation stage after charging, and comprehensively evaluating the equalization priority of each battery cell, this solution, compared with the prior art which only relies on the charging end voltage or the open circuit voltage after resting, uses the voltage transient rise during the charging current reduction stage to reflect the internal resistance difference, uses the voltage jump at the moment of charging end to extract the ohmic polarization characteristics, and uses the relaxation voltage to calculate the true open circuit voltage. The three complement each other and avoid the problem of misjudgment by a single indicator. Especially in scenarios where voltage changes are minimal in the lithium iron phosphate platform region, traditional methods are prone to failure. This solution, however, significantly improves the accuracy of identifying cells with capacity decay and internal resistance degradation through multi-dimensional time-domain feature fusion. This solves the problem of existing battery balancing schemes failing to accurately identify the charge level of individual battery cells, resulting in low accuracy in battery cell balancing.

[0081] As an optional solution, the first determining unit includes a data acquisition module and a first determining module; the data acquisition module is used to acquire the minimum voltage drop and the maximum voltage recovery of each of the aforementioned battery cells during the charging current reduction period; the first determining module is used to determine the voltage recovery amplitude corresponding to each of the aforementioned battery cells based on the minimum voltage drop and the maximum voltage recovery.

[0082] In one optional scheme, the second determining unit includes a first calculation module, which is used to calculate the jump voltage value of each of the battery cells after the power battery pack is charged at a preset acquisition step size, and use the jump voltage value as the ohmic voltage corresponding to the battery cell.

[0083] In one alternative, the third determining unit includes a second determining module, used to determine the first formula: Determine the relaxation voltage corresponding to each of the above-mentioned battery cells, wherein, The relaxation voltage mentioned above, Open circuit voltage, This represents the amplitude of the electrochemical polarization voltage. The electrochemical polarization time constant is This represents the amplitude of the concentration polarization voltage. t is the concentration polarization time constant, and t is the resting time of the above-mentioned battery cells after charging is completed.

[0084] In one optional scheme, the equalization processing unit includes a second calculation module and a third determination module; the second calculation module is used to calculate a first equalization score corresponding to each of the battery cells based on the voltage rise amplitude, a second equalization score corresponding to each of the battery cells based on the ohmic voltage, and a third equalization score corresponding to each of the battery cells based on the relaxation voltage; the third determination module is used to determine the equalization priority score of each of the battery cells based on the first equalization score, the second equalization score, and the third equalization score.

[0085] In one optional embodiment, the second calculation module includes a first calculation submodule, a second calculation submodule, and a third calculation submodule; the first calculation submodule is used to calculate according to the second formula: Calculate the first equilibrium score corresponding to each of the aforementioned battery cells, where, For the first equilibrium fraction mentioned above, This represents the average voltage recovery rate of a single battery cell. For the voltage recovery range mentioned above, The voltage limit is used; the second calculation submodule is used to calculate based on the third formula: Calculate the second equilibrium score corresponding to each of the aforementioned battery cells, where, This is the second equilibrium score mentioned above. This represents the average ohmic voltage of a single battery cell. For the above ohmic voltage, Ohmic voltage limit; the third calculation submodule is used to calculate according to the fourth formula: Calculate the third equilibrium score corresponding to each of the aforementioned battery cells. The third equilibrium fraction mentioned above, This represents the average open-circuit voltage of a single battery cell. The relaxation voltage mentioned above, Open-circuit voltage limit.

[0086] In one alternative approach, the third determining module includes a determining submodule and a processing submodule; the determining submodule is used to determine the fifth formula: Determine the balanced priority score for each of the aforementioned battery cells, where, For the above-mentioned balanced priority scores, For the first equilibrium fraction mentioned above, This is the second equilibrium score mentioned above. The third equilibrium fraction mentioned above, , , The weighting coefficient is used to perform forced equalization processing on the battery cells whose equalization priority score is greater than or equal to the first preset score, recommended equalization processing on the battery cells whose equalization priority score is less than the first preset score but greater than or equal to the second preset score, and no equalization processing on the battery cells whose equalization priority score is less than the second preset score, wherein the first preset score is greater than the second preset score.

[0087] The battery cell balancing device described above includes a processor and a memory. The first determining unit, the second determining unit, the third determining unit, and the balancing processing unit are all stored as program units in the memory. The processor executes the program units stored in the memory to achieve the corresponding functions. All of the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0088] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can address the problem of existing battery balancing schemes failing to accurately identify the charge level of individual battery cells, resulting in low accuracy in battery cell balancing.

[0089] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0090] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the battery cell balancing method.

[0091] Specifically, the balancing methods for individual battery cells include:

[0092] Step S201: When the power battery pack is detected to be in the charging current reduction period, determine the voltage recovery range of each battery cell in the power battery pack.

[0093] Step S202: Upon detecting the end of charging of the aforementioned power battery pack, determine the ohmic voltage corresponding to each of the aforementioned battery cells.

[0094] Step S203: After a preset time period following the completion of charging of the aforementioned power battery pack, determine the relaxation voltage corresponding to each of the aforementioned battery cells.

[0095] Step S204: Based on the voltage rise amplitude, ohmic voltage and relaxation voltage of each of the aforementioned battery cells, determine the balancing priority score of each of the aforementioned battery cells, and perform balancing processing on each of the aforementioned battery cells according to the balancing priority score.

[0096] This invention provides a processor for running a program, wherein the program executes the battery cell balancing method during runtime.

[0097] Specifically, the balancing methods for individual battery cells include:

[0098] Step S201: When the power battery pack is detected to be in the charging current reduction period, determine the voltage recovery range of each battery cell in the power battery pack.

[0099] Step S202: Upon detecting the end of charging of the aforementioned power battery pack, determine the ohmic voltage corresponding to each of the aforementioned battery cells.

[0100] Step S203: After a preset time period following the completion of charging of the aforementioned power battery pack, determine the relaxation voltage corresponding to each of the aforementioned battery cells.

[0101] Step S204: Based on the voltage rise amplitude, ohmic voltage and relaxation voltage of each of the aforementioned battery cells, determine the balancing priority score of each of the aforementioned battery cells, and perform balancing processing on each of the aforementioned battery cells according to the balancing priority score.

[0102] This invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0103] Step S201: When the power battery pack is detected to be in the charging current reduction period, determine the voltage recovery range of each battery cell in the power battery pack.

[0104] Step S202: Upon detecting the end of charging of the aforementioned power battery pack, determine the ohmic voltage corresponding to each of the aforementioned battery cells.

[0105] Step S203: After a preset time period following the completion of charging of the aforementioned power battery pack, determine the relaxation voltage corresponding to each of the aforementioned battery cells.

[0106] Step S204: Based on the voltage rise amplitude, ohmic voltage and relaxation voltage of each of the aforementioned battery cells, determine the balancing priority score of each of the aforementioned battery cells, and perform balancing processing on each of the aforementioned battery cells according to the balancing priority score.

[0107] The devices mentioned in this article can be servers, PCs, tablets, mobile phones, etc.

[0108] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0109] Step S201: When the power battery pack is detected to be in the charging current reduction period, determine the voltage recovery range of each battery cell in the power battery pack.

[0110] Step S202: Upon detecting the end of charging of the aforementioned power battery pack, determine the ohmic voltage corresponding to each of the aforementioned battery cells.

[0111] Step S203: After a preset time period following the completion of charging of the aforementioned power battery pack, determine the relaxation voltage corresponding to each of the aforementioned battery cells.

[0112] Step S204: Based on the voltage rise amplitude, ohmic voltage and relaxation voltage of each of the aforementioned battery cells, determine the balancing priority score of each of the aforementioned battery cells, and perform balancing processing on each of the aforementioned battery cells according to the balancing priority score.

[0113] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0114] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of 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, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0116] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0117] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0118] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0119] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0120] Computer-readable media include both permanent and non-permanent, removable and non-removable media that can store information by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0121] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0122] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0123] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for balancing individual battery cells, characterized in that, include: When the power battery pack is detected to be in a charging current reduction period, the voltage recovery amplitude of each battery cell in the power battery pack is determined. Upon detecting the end of charging of the power battery pack, the ohmic voltage corresponding to each of the battery cells is determined; After a preset time period following the completion of charging of the power battery pack, the relaxation voltage corresponding to each battery cell is determined. Based on the voltage recovery amplitude, ohmic voltage, and relaxation voltage of each battery cell, a balancing priority score is determined for each battery cell, and balancing processing is performed on each battery cell according to the balancing priority score.

2. The method according to claim 1, characterized in that, Determining the voltage recovery amplitude of each battery cell in the power battery pack includes: The lowest voltage drop and the highest voltage recovery of each battery cell during the charging current reduction period are collected. The voltage recovery amplitude corresponding to each battery cell is determined based on the lowest voltage drop value and the highest voltage recovery value.

3. The method according to claim 1, characterized in that, Determining the ohmic voltage corresponding to each of the aforementioned battery cells includes: After the power battery pack is fully charged, calculate the jump voltage value of each battery cell at a preset acquisition step size, and use the jump voltage value as the ohmic voltage corresponding to the battery cell.

4. The method according to claim 1, characterized in that, Determining the relaxation voltage corresponding to each of the aforementioned battery cells includes: According to the first formula: Determine the relaxation voltage corresponding to each of the aforementioned battery cells, wherein, The relaxation voltage is... Open circuit voltage, This represents the amplitude of the electrochemical polarization voltage. The electrochemical polarization time constant is This represents the amplitude of the concentration polarization voltage. t is the concentration polarization time constant, and t is the resting time of the battery cell after charging is completed.

5. The method according to claim 1, characterized in that, Based on the voltage recovery amplitude, ohmic voltage, and relaxation voltage corresponding to each of the battery cells, a balancing priority score is determined for each of the battery cells, including: The first equalization score for each battery cell is calculated based on the voltage rise amplitude, the second equalization score for each battery cell is calculated based on the ohmic voltage, and the third equalization score for each battery cell is calculated based on the relaxation voltage. The equalization priority score of each battery cell is determined based on the first equalization score, the second equalization score, and the third equalization score.

6. The method according to claim 5, characterized in that, The calculation of a first equalization score for each battery cell based on the voltage recovery amplitude, a second equalization score for each battery cell based on the ohmic voltage, and a third equalization score for each battery cell based on the relaxation voltage includes: According to the second formula: Calculate the first equalization score corresponding to each of the battery cells, where, This is the first equilibrium score. This represents the average voltage recovery rate of a single battery cell. The voltage recovery amplitude, Voltage limit; According to the third formula: Calculate the second equalization score corresponding to each of the battery cells, wherein, This is the second equilibrium score. This represents the average ohmic voltage of a single battery cell. The ohmic voltage, Ohmic voltage limit; According to the fourth formula: Calculate the third equalization score corresponding to each of the aforementioned battery cells. The third equilibrium score, This represents the average open-circuit voltage of a single battery cell. The relaxation voltage is... Open-circuit voltage limit.

7. The method according to claim 5, characterized in that, Determine the balancing priority score for each of the battery cells, and perform balancing processing on each of the battery cells according to the balancing priority score, including: According to the fifth formula: Determine the balanced priority score for each of the aforementioned battery cells, wherein, The balanced priority score, This is the first equilibrium score. This is the second equilibrium score. The third equilibrium score, , , These are the weighting coefficients; Battery cells with a balance priority score greater than or equal to a first preset score are subject to forced balance processing; battery cells with a balance priority score less than the first preset score but greater than or equal to a second preset score are subject to recommended balance processing; and battery cells with a balance priority score less than the second preset score are not subject to balance processing, wherein the first preset score is greater than the second preset score.

8. A battery cell balancing device, characterized in that, include: The first determining unit is used to determine the voltage recovery amplitude of each battery cell in the power battery pack when the power battery pack is detected to be in a charging current reduction period. The second determining unit is used to determine the ohmic voltage corresponding to each of the battery cells when the power battery pack is detected to be finished charging. The third determining unit is used to determine the relaxation voltage of each battery cell after a preset time period following the end of charging of the power battery pack. The equalization processing unit is used to determine the equalization priority score of each battery cell based on the voltage rise amplitude, the ohmic voltage and the relaxation voltage corresponding to each battery cell, and to perform equalization processing on each battery cell based on the equalization priority score.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the battery cell equalization method according to any one of claims 1 to 7.

10. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a method for performing equalization of a battery cell according to any one of claims 1 to 7.

Images