Battery control method, system, device, storage medium and program product

Abstract

This application provides a battery control method, system, device, storage medium, and program product. The method includes: acquiring the charge capacity of a first battery in a battery device; when the charge capacity of the first battery is within the charge capacity range of a corresponding voltage platform, controlling a second battery to exchange energy with the first battery to adjust the charge capacity of the first battery to outside the charge capacity range of the corresponding voltage platform, and controlling the first and second batteries to perform charge balancing regulation. By controlling the energy exchange between the second and first batteries, the charge capacity of the first battery can be moved out of the charge capacity range of the corresponding voltage platform, creating a significant potential difference between the two battery cells or battery packs, thereby performing charge balancing regulation to achieve effective sensing and active adjustment of the charge capacity between battery cells or battery packs, reducing the possibility of overcharging or over-discharging due to inconsistent charge capacity, and reducing the risk of battery performance degradation.

Description

Technical Field

[0001] This invention relates to the field of battery management technology, and in particular to a battery control method, system, device, storage medium, and program product. Background Technology

[0002] Currently, due to manufacturing differences, aging, and environmental factors, the State of Charge (SOC) of different battery cells or battery packs in battery devices often varies. If the SOC balance between different battery cells or battery packs is not adjusted in a timely manner, some battery cells may be overcharged or over-discharged, resulting in battery performance degradation. Summary of the Invention

[0003] This invention provides a battery control method, system, device, storage medium, and program product to solve the problem of battery performance degradation caused by inconsistent charge levels between different battery cells or battery packs during battery operation.

[0004] In a first aspect, embodiments of this application provide a battery control method, including:

[0005] Obtain the charge level of the first battery;

[0006] When the charge of the first battery is within the charge range of the corresponding voltage platform, the second battery is controlled to exchange energy with the first battery to adjust the charge of the first battery to a charge range outside the corresponding voltage platform.

[0007] Control the first battery and the second battery to perform charge balance adjustment.

[0008] In this embodiment, when the first battery is within the charge range of the corresponding voltage platform, a charge regulation operation is actively triggered. That is, by controlling the energy exchange between the second battery and the first battery in the battery device, the charge of the first battery can be removed from the charge range of the corresponding voltage platform, and a significant potential difference is created between the two battery cells or battery packs. This performs charge balancing regulation to induce the natural flow of current inside the battery, thereby achieving effective sensing and active regulation of the charge between battery cells or battery packs in the battery device. This reduces the possibility of overcharging or over-discharging caused by inconsistent charge, and lowers the risk of battery performance degradation.

[0009] In one embodiment, when the charge of the first battery is within the charge range of the corresponding voltage platform, controlling the second battery to exchange energy with the first battery to adjust the charge of the first battery to a charge outside the charge range of the corresponding voltage platform includes: when the charge of the first battery is within a first range, controlling the first battery to discharge to the second battery to reduce the charge of the first battery to a first charge, which is less than the minimum value of the first range; when the charge of the first battery is within a second range, controlling the second battery to charge the first battery to increase the charge of the first battery to a second charge, which is greater than the maximum value of the second range; the first range and the second range are within the charge range of the corresponding voltage platform, and the maximum value of the first range is less than the center value of the charge range of the corresponding voltage platform, and the minimum value of the second range is greater than the center value of the charge range of the corresponding voltage platform. This scheme further divides the charge range of the battery's voltage platform into a first interval and a second interval at the boundary, and sets corresponding adjustment targets for each. It can perform short-term and precise charge adjustment for different situations where the first battery's charge is in these two intervals, achieving effective potential difference generation with less energy adjustment cost, reducing energy loss and redundant adjustment time, and improving energy exchange efficiency and the trigger speed of charge balance adjustment.

[0010] In one embodiment, when the charge level of the first battery is within the charge level range of the corresponding voltage platform, the second battery is controlled to exchange energy with the first battery to adjust the charge level of the first battery to outside the charge level range of the corresponding voltage platform. This includes: when the charge levels of both the first and second batteries are within a first range, controlling the first battery to discharge to the second battery to reduce the charge level of the first battery to the first charge level; and after resting for a first preset time, controlling the second battery to discharge to the first battery to reduce the charge level of the second battery to the first charge level. This solution, through the coordinated charging and discharging of the first and second batteries, allows the charge levels of both batteries to move away from the platform region together, which not only improves the efficiency of potential difference construction and equalization speed and reduces the discharge burden of a single battery, but also enhances the accuracy of subsequent charge level calibration.

[0011] In one embodiment, after reducing the charge of the second battery to the first charge, the method further includes: after resting for a second preset time, controlling the first battery to discharge to the second battery again until the charge of the first battery and the second battery are the same, which can eliminate residual deviations in the previous adjustment process, improve the final charge consistency, and improve the balancing effect.

[0012] In one embodiment, when the charge levels of both the first battery and the second battery are within a first range, controlling the first battery to discharge into the second battery to reduce the charge level of the first battery to the first charge level includes: when the charge level of the first battery is within the first range and the charge levels of multiple second batteries are also within the first range, identifying a target battery among the multiple second batteries with charge levels within the first range, the target battery being the second battery with the smallest charge level difference from the first battery; and when the charge level of the first battery is less than or equal to that of the target battery, controlling the first battery to discharge into the target battery to reduce the charge level of the first battery to the first charge level. By selecting the target battery with the smallest charge level difference from the first battery among multiple candidate batteries for discharge pairing, and prioritizing the adjustment of batteries with charge levels closer to the first charge level, the amount of energy migration required for adjustment can be reduced, and the adjustment speed can be improved.

[0013] In one embodiment, when the charge level of the first battery is within the charge level range of the corresponding voltage platform, the second battery is controlled to exchange energy with the first battery to adjust the charge level of the first battery to a charge level outside the charge level range of the corresponding voltage platform. This includes: when the charge levels of both the first and second batteries are within a second range, controlling the second battery to charge the first battery to increase the charge level of the first battery to a second charge level; and after a third preset rest period, controlling the first battery to charge the second battery to increase the charge level of the second battery to a second charge level. Through coordinated charging and discharging between the first and second batteries, the charge levels of both batteries move out of the platform region together, which not only improves the efficiency of potential difference construction and equalization speed and reduces the discharge burden of a single battery, but also enhances the accuracy of subsequent charge level calibration.

[0014] In one embodiment, after increasing the charge of the second battery to a second charge level, the method further includes: after resting for a fourth preset time, controlling the second battery to charge the first battery again until the charge levels of the first battery and the second battery are the same, which can eliminate residual deviations in the previous adjustment process, improve the final charge consistency, and enhance the balancing effect.

[0015] In one embodiment, when the charge levels of both the first and second batteries are within a second range, controlling the second battery to charge the first battery to increase its charge level to the second charge level includes: when the charge level of the first battery is within the second range, and the charge levels of multiple second batteries are also within the second range, identifying a target battery among the multiple second batteries with charge levels within the second range; the target battery being the second battery with the smallest charge level difference from the first battery; and when the charge level of the first battery is greater than or equal to that of the target battery, controlling the target battery to charge the first battery to increase its charge level to the second charge level. By selecting the target battery with the smallest charge level difference from the first battery among multiple candidate batteries for discharge pairing, and prioritizing the adjustment of batteries with charge levels closer to the second charge level, the amount of energy migration required for adjustment can be reduced, and the adjustment speed can be improved.

[0016] In one embodiment, the first battery is a single battery cell. After obtaining the charge capacity of the first battery in the battery device, the method further includes: if the charge capacity of the first battery is abnormal, calibrating the charge capacity of the first battery based on the charge capacity of multiple battery cells in the battery pack to which the first battery belongs. This solution can effectively identify and correct battery cells with abnormal charge capacity, reduce the charge capacity difference between the battery cell and other battery cells in the battery pack, and solve the problem of overcharging or over-discharging caused by charge capacity deviation during battery charging and discharging, thereby helping to improve the safety, consistency and cycle life of the overall battery device.

[0017] In one embodiment, if the difference between the charge capacity of the first battery and a preset charge capacity is greater than a preset difference, it is determined that the charge capacity of the first battery is abnormal. The preset charge capacity is the average charge capacity of multiple battery cells in the battery pack containing the first battery. By comparing the first battery with the average charge capacity of the battery cells in the battery pack, the abnormal battery cells with large charge capacity deviations are quickly identified.

[0018] In one embodiment, the first battery is calibrated based on the charge levels of multiple individual cells in the battery pack containing the first battery. This includes: identifying a reference battery among the multiple individual cells in the battery pack, where the reference battery is a cell whose charge level meets preset conditions; and controlling the first battery to exchange energy with the reference battery to calibrate the charge level of the first battery to a target charge level, where the target charge level is calibrated based on the charge level of the reference battery. This solution can effectively identify and correct individual cells with large charge level deviations, reducing the charge level difference between the individual cell and other individual cells in the battery pack, and realigning its state of charge with that of the other individual cells in the battery pack. This effectively solves the problem of overcharging or over-discharging caused by charge level deviations during battery charging and discharging, and helps improve the overall safety, consistency, and cycle life of the battery device.

[0019] In one embodiment, controlling the first battery to exchange energy with a reference battery to calibrate the charge of the first battery to a target charge includes: controlling the first battery to exchange energy with the reference battery to adjust the charge of the first battery to a preset charge outside the charge range of the corresponding voltage platform; controlling the first battery and the reference battery to perform charge balancing adjustment and updating the charge of the first battery, wherein the difference between the preset charge and the charge of the first battery before adjustment is greater than a preset difference; after updating the charge of the first battery, controlling the reference battery to perform reverse energy exchange with the first battery to adjust the charge of the first battery to the target charge, wherein the target charge is the average charge of the updated first battery and the reference battery. This two-stage energy adjustment can quickly calibrate the charge of individual battery cells to a level close to that of the reference battery, improving the accuracy of charge calibration, restoring the consistency of charge between individual battery cells, and reducing the risk of overcharging or over-discharging individual battery cells.

[0020] Secondly, embodiments of this application provide a battery management system, including:

[0021] The acquisition module is used to acquire the charge capacity of the first battery in the battery device;

[0022] The control module is used to control the second battery to exchange energy with the first battery when the charge of the first battery is within the charge range of the corresponding voltage platform, so as to adjust the charge of the first battery to a charge range outside the corresponding voltage platform.

[0023] The equalization module is used to control the charge balance adjustment between the first battery and the second battery.

[0024] Thirdly, embodiments of this application provide a battery system, including a battery device and a battery management system. The battery device includes a first battery and a second battery, with the second battery connected to the first battery. The battery management system is used to execute the steps of the above-described battery control method.

[0025] Fourthly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described battery control method.

[0026] Fifthly, embodiments of this application provide a readable storage medium storing a computer program that, when executed by a processor, implements the steps of the battery control method described above.

[0027] Sixthly, embodiments of this application provide a computer program product, including a computer program, which, when run, causes the above-described battery control method to be executed. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a battery management system in one embodiment of the present invention;

[0030] Figure 2 This is a schematic flowchart of a battery control method in one embodiment of the present invention;

[0031] Figure 3 yes Figure 2 A schematic diagram of the implementation process of step S20;

[0032] Figure 4 yes Figure 2 Another implementation flow diagram of step S20;

[0033] Figure 5 yes Figure 2 Another implementation flowchart of step S20;

[0034] Figure 6 This is another schematic flowchart of the battery control method in one embodiment of the present invention;

[0035] Figure 7 yes Figure 6 A schematic diagram of the implementation process of step S40;

[0036] Figure 8 yes Figure 7 A schematic diagram of the implementation process of step S42;

[0037] Figure 9 yes Figure 1 A schematic diagram of the structure of a battery management system;

[0038] Figure 10 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. It should also be understood that, as used in this specification and the appended claims, the term "and / or" refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0041] Furthermore, in the description of this invention and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of the invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0043] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0044] To illustrate the technical solution of the present invention, specific embodiments are described below.

[0045] In this application embodiment, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and this is not limited to these.

[0046] The battery device mentioned in the embodiments of this application refers to a single battery cluster comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or battery pack. A battery device generally includes a housing for encapsulating one or more battery cells.

[0047] The battery pack mentioned in the embodiments of this application is a battery module composed of multiple battery cells connected in series. A battery device may include one or more battery packs, and multiple battery packs within the battery device are connected in parallel to increase the total capacity of the battery device. The battery cells within a battery pack have the same current, and the total charge of the battery pack is determined by the combined charge of the battery cells connected in series.

[0048] The state of charge (SOC) mentioned in the embodiments of this application is the ratio of the battery's remaining charge to its rated capacity. The SOC is 0 when the battery is completely discharged and 1 when it is fully charged.

[0049] The battery system mentioned in the embodiments of this application includes a battery device and a battery management system (BMS). The battery management system is a system that monitors the state of the battery (temperature, voltage, current, SOC, etc.) and provides management and control for the battery, such as communication, safety, and battery balancing.

[0050] The voltage plateau of a battery mentioned in the embodiments of this application refers to a relatively stable phase in which the battery voltage changes over time or with battery capacity during charging and discharging. This voltage plateau is represented on the battery capacity-voltage curve as a gentle line segment with a slope close to zero, reflecting that the electrochemical reaction is in a dynamic equilibrium state.

[0051] The charge range of the corresponding voltage platform mentioned in the embodiments of this application refers to the range of change in the charge of the battery when it is at the voltage platform. This charge range of the corresponding voltage platform is a pre-calibrated charge range. When the battery in the battery device is within the charge range of the corresponding voltage platform, there is no strong correlation between the voltage and charge of the first battery; that is, when the battery charge changes, the voltage change is small or even does not change. This charge range of the corresponding voltage platform can be calibrated based on the measured data of the battery device. For example, the charge range of the corresponding voltage platform can be [25%, 95%]; in other embodiments, the charge range of the corresponding voltage platform can also be an empirical value range [30%, 80%].

[0052] Currently, due to manufacturing differences, aging, and environmental influences, the charge levels of multiple battery cells in a battery device often vary. If the charge balance between different battery cells or battery packs is not adjusted in a timely manner, some battery cells may be overcharged or over-discharged, leading to battery performance degradation. To address this, one embodiment provides a battery charge balancing strategy that can be a passive balancing strategy (such as resistor discharge) triggered by a voltage threshold. Since the voltage of a battery cell typically changes in response to changes in charge level, during battery operation, a passive charge balancing strategy can be triggered based on a voltage threshold or voltage change rate to induce natural current flow between battery cells, achieving automatic energy transfer and thus achieving charge balance.

[0053] However, some batteries exhibit a distinct voltage plateau region, such as lithium iron phosphate (LFP) batteries. When the charge capacity of an LFP battery varies within a certain range (e.g., 30% to 80%), its voltage and charge capacity are not strongly correlated. Larger changes in charge capacity result in smaller or no voltage changes, exhibiting a plateau state. When this battery is in a voltage plateau region, it is difficult to identify differences in battery voltage, making it impossible to timely and accurately balance the charge capacity of individual battery cells or battery packs based on voltage. This results in poor balancing performance, and long-term accumulation can easily lead to battery performance degradation.

[0054] To address the aforementioned issues, this application provides a battery control method, system, device, storage medium, and program product. During the operation of the battery device, the method acquires the charge of individual battery cells (or battery packs) within the battery device. When the charge of any individual battery cell (or battery pack) is within the charge range of the corresponding voltage platform, the method controls other individual battery cells (or other battery packs) within the battery device to exchange energy with that individual battery cell (or battery pack), thereby adjusting the charge of that individual battery cell (or battery pack) to a charge range outside the corresponding voltage platform. This triggers a charge balancing strategy, achieving charge balancing adjustment of the individual battery cells within the battery device. By exchanging energy with individual cells or battery packs within a battery device that fall within the corresponding voltage plateau's charge range, the charge of these cells or packs can be decoupled from the charge range of that voltage plateau. This creates a significant potential difference between the two cells or packs, triggering a passive charge balancing strategy and initiating the natural flow of current within the battery device. This enables effective sensing and proactive adjustment of the charge levels between individual cells or packs, reducing overcharging or over-discharging caused by charge inconsistencies and lowering the risk of battery performance degradation. Simultaneously, it achieves timely and efficient charge balancing, resolving the issue of small voltage variations within the voltage plateau region that hinder the triggering of the charge balancing strategy and result in poor balancing effects. This improves the battery charge balancing effect and reduces the risk of battery performance degradation.

[0055] The battery control method provided in this embodiment of the invention can be applied to, for example... Figure 1 The battery system shown includes a battery device and a battery management system. The battery device communicates with the battery management system via a network or cable. The battery device includes a first battery and a second battery, with the second battery connected to the first battery. Both the first and second batteries are individual battery cells, or both are battery packs formed by connecting multiple individual battery cells in series. The battery management system acquires the charge level of the first battery. If the charge level of the first battery is within the charge level range of the corresponding voltage platform, it controls the second battery to exchange energy with the first battery, adjusting the charge level of the first battery to outside the charge level range of the corresponding voltage platform; it also controls the first and second batteries to perform charge leveling.

[0056] The battery unit is equipped with various sensors, such as those for detecting parameters like current, voltage, temperature, and SOC. The battery management system monitors the current, voltage, temperature, and SOC of each battery within the unit using these sensors. During operation, the system monitors the charge of the first battery and its corresponding voltage plateau. When the charge of the first battery falls within its designated range, the system controls the second battery to exchange energy with it, adjusting its charge to a level outside the plateau's range. Finally, the system balances the charge of the first and second batteries. When the first battery's charge is within its designated range, there is no strong correlation between its voltage and charge; that is, changes in charge result in minimal or no change in voltage.

[0057] In this embodiment, when the first battery is within the charge range of the corresponding voltage platform, a charge regulation operation is actively triggered. This involves controlling the energy exchange between the second and first batteries within the battery pack. For example, the second battery can charge or discharge the first battery, causing its charge to move out of the charge range of the corresponding voltage platform. This creates a significant potential difference between the two battery cells or battery packs, triggering charge balancing regulation and inducing natural current flow within the battery. This achieves effective sensing and active regulation of the charge between battery cells or battery packs within the battery pack, reducing overcharging or over-discharging due to inconsistent charge levels and lowering the risk of battery performance degradation. Furthermore, this solution does not require external energy or complex hardware structures; it relies on the control channels of existing battery cells within the battery pack for energy exchange, achieving timely and precise charge regulation. This results in timely and efficient charge balancing, solving the problem of small voltage variations within the voltage platform region leading to difficulty in triggering the SOC balancing strategy and poor balancing effects. This improves battery charge balancing performance, reduces the risk of battery performance degradation, and enhances safety and lifespan.

[0058] In some embodiments, after controlling the second battery to exchange energy with the first battery and adjusting the charge of the first battery (or the first battery) to a charge range outside the corresponding voltage platform, the charge of each battery in the battery device is monitored so that if an abnormality is detected in the charge of a battery (such as the first battery) in the battery device, the charge of the abnormal battery is calibrated.

[0059] Within the voltage plateau, battery voltage changes are not significant. Using voltage-charge curves for charge estimation results in low accuracy. Furthermore, using current-based ampere-hour integration for charge estimation accumulates errors within the voltage plateau region, reducing accuracy and hindering subsequent battery management. The battery control method provided in this embodiment controls energy exchange between the second and first batteries within the battery device. This allows the first battery's charge to deviate from the charge range of the corresponding voltage plateau, creating a significant potential difference between the two individual batteries or the battery pack. This allows for timely updates to the battery charge based on current and voltage changes, enabling timely charge calibration when abnormalities are detected. This provides more opportunities for charge calibration, ensuring accurate battery charge identification and facilitating battery management based on accurate charge levels.

[0060] In one embodiment, such as Figure 2 As shown, a battery control method is provided, which is applied to... Figure 1 Taking the battery device in the example, the following steps are included:

[0061] S10: Obtain the charge of the first battery in the battery device.

[0062] The battery device includes multiple batteries, which can be individual battery cells or battery packs formed by connecting multiple individual battery cells in series. The battery device includes at least a first battery and a second battery other than the first battery, the second battery being located within the battery device and connected to the first battery; the first battery and the second battery are both individual battery cells, or both the first battery and the second battery are battery packs formed by connecting multiple individual battery cells in series.

[0063] During the operation of the battery device, the battery management system monitors the charge of the first and second batteries to obtain their charge levels and determine whether their charge levels fall within the charge range of their corresponding voltage platforms. The charge levels of the first and second batteries can be predicted using preset charge level algorithms such as the ampere-hour integration method and the open-circuit voltage method.

[0064] The charge range of the corresponding voltage platform is a pre-calibrated charge range. When the battery in the battery device (such as the first battery or the second battery) is within the charge range of the corresponding voltage platform, there is no strong correlation between the voltage and charge of the first battery. That is, when the charge of the battery changes, the voltage changes little or not at all. The charge range of the corresponding voltage platform can be calibrated based on the measured data of the battery device. For example, the charge range of the corresponding voltage platform can be [25%, 95%]; in other embodiments, the charge range of the corresponding voltage platform can also be an empirical value range [30%, 80%].

[0065] S20: When the charge of the first battery is within the charge range of the corresponding voltage platform, control the second battery to exchange energy with the first battery to adjust the charge of the first battery to a charge range outside the corresponding voltage platform.

[0066] When the charge of the first battery is within the charge range of the corresponding voltage platform, the battery management system can control the second battery to exchange energy with the first battery. For example, it can charge the first battery based on the second battery or adjust the charge of the first battery to a charge range outside the corresponding voltage platform.

[0067] For example, different energy exchange strategies can be implemented based on the specific position of the first battery's charge level within the charge range of the corresponding voltage platform. For instance, if the first battery's charge level is close to the minimum value of the charge range of the corresponding voltage platform, the first battery can be controlled to discharge into the second battery to reduce its charge level until it is adjusted to a rated charge level less than the minimum value of the charge range of the corresponding voltage platform, such as 15% or 20%. If the first battery's charge level is close to the maximum value of the charge range of the corresponding voltage platform, the second battery can be controlled to discharge into the first battery to increase its charge level until it is adjusted to a rated charge level greater than the maximum value of the charge range of the corresponding voltage platform, such as 97%, 98%, or 99%.

[0068] In other embodiments, when the charge capacity of the first battery is within the charge capacity range of the corresponding voltage platform, the battery management system can select a second battery with a charge capacity less than that of the first battery in the battery device. Using the first battery as the current output terminal and the second battery as the current input terminal, the system controls the current from the first battery to flow into the second battery to exchange energy between them, ensuring that the charge capacity of the first battery is less than the minimum value of the charge capacity range of the corresponding voltage platform. Alternatively, the battery management system can select a second battery with a charge capacity greater than that of the first battery in the battery device. Using the first battery as the current input terminal and the second battery as the current output terminal, the system controls the current from the second battery to flow into the first battery, ensuring that the charge capacity of the first battery is greater than the maximum value of the charge capacity range of the corresponding voltage platform.

[0069] S30: Controls the first battery and the second battery to perform charge balance adjustment.

[0070] After adjusting the charge of the first battery to a charge range outside the corresponding voltage platform, due to the large changes in the charge of the first and second batteries, there is a significant potential difference between them, resulting in a large change in battery voltage. At this time, the first and second batteries meet the conditions for charge balancing adjustment, thereby triggering a voltage-based charge balancing strategy. That is, the battery management system controls the first and second batteries to perform charge balancing adjustment, so as to induce the natural flow of current between the battery cells in the battery device, thereby achieving charge balancing adjustment of the battery cells in the battery device.

[0071] In this embodiment, when the first battery is within the charge range of the corresponding voltage platform, a charge regulation operation is actively triggered. This involves controlling the energy exchange between the second and first batteries within the battery device. For example, the second battery can charge or discharge the first battery, causing its charge to move out of the charge range of the corresponding voltage platform. This creates a significant potential difference between the two battery cells or battery packs, thereby performing battery charge balancing regulation to induce natural current flow within the battery. This achieves effective sensing and active regulation of the charge between battery cells or battery packs within the battery device, reducing overcharging or over-discharging caused by inconsistent charge levels, improving the accuracy of battery charge identification, and reducing the risk of battery performance degradation. Furthermore, this solution does not require external energy or complex hardware structures. It relies on the control channels of existing battery cells within the battery device for energy exchange, achieving timely and accurate charge regulation. This results in timely and efficient charge balancing, solving the problem of small voltage variations within the voltage platform region leading to difficulty in triggering the SOC balancing strategy and poor balancing effects. This improves the battery charge balancing effect and reduces the risk of battery performance degradation.

[0072] In one embodiment, such as Figure 3 As shown, in step S20, when the charge level of the first battery is within the charge level range of the corresponding voltage platform, the second battery is controlled to exchange energy with the first battery to charge and discharge the first battery, thereby adjusting the charge level of the first battery to be outside the charge level range of the corresponding voltage platform. This specifically includes the following steps:

[0073] S201: When the charge of the first battery is in the first range, control the first battery to discharge to the second battery so as to reduce the charge of the first battery to the first charge level.

[0074] The battery management system monitors the charge of the first battery in the battery device to obtain the charge of the first battery, and executes different energy exchange strategies when the charge of the first battery is in different ranges, thereby reducing the amount of energy exchanged, improving the energy exchange efficiency, and increasing the triggering speed of the charge balancing strategy.

[0075] The first interval is within the charge range of the corresponding voltage platform, and the maximum value of the first interval is less than the center value of the charge range of the corresponding voltage platform. The second interval is within the charge range of the corresponding voltage platform, and the minimum value of the second interval is greater than the center value of the charge range of the corresponding voltage platform. For example, if the charge range of the corresponding voltage platform is [25%, 95%], then the first interval could be [25%, 40%], and the second interval could be [80%, 95%].

[0076] If the charge level of the first battery is determined to be within a first range, the battery management system can control the first battery to discharge to the second battery, thereby reducing the charge level of the first battery to the first charge level. The first charge level is less than the minimum value of the first range. For example, the first charge level can be 20%, 15%, 10%, etc., which are values ​​less than the minimum value of the first range, that is, less than the minimum value of the charge level range corresponding to the voltage platform.

[0077] For example, the battery management system can select a second battery in the battery device with a lower charge than the first battery, and use the first battery as the current output terminal and the second battery as the current input terminal. It controls the current from the first battery to flow into the second battery to exchange energy between the two until the charge of the first battery is reduced to the first charge, making the charge of the first battery less than the minimum value of the charge range of the corresponding voltage platform. This triggers a voltage-based charge balancing strategy to induce the natural flow of current among the battery cells in the battery device, thereby achieving charge balancing adjustment of the battery cells in the battery device and keeping the charge of the battery cells in the battery device as consistent as possible.

[0078] S202: When the charge level of the first battery is in the second range, control the second battery to charge the first battery so as to increase the charge level of the first battery to the second charge level.

[0079] If the charge level of the first battery is determined to be within the second range, the battery management system can control the second battery to charge the first battery, that is, control the second battery to discharge to the first battery, so as to increase the charge level of the first battery to the second charge level. The second charge level is greater than the maximum value of the second range; for example, the second charge level can be 96%, 97%, 98%, etc., which are values ​​greater than the maximum value of the second range, that is, greater than the maximum value of the charge level range corresponding to the voltage platform.

[0080] For example, the battery management system can select a second battery in the battery device with a higher charge than the first battery, and use the second battery as the current output terminal and the first battery as the current input terminal. It controls the current from the second battery to flow into the first battery to exchange energy between the two until the charge of the first battery rises to the level of the second battery, making the charge of the second battery greater than the maximum value of the charge range of the corresponding voltage platform. This triggers a voltage-based charge balancing strategy to induce the natural flow of current among the battery cells in the battery device, thereby achieving charge balancing adjustment of the battery cells in the battery device and improving the consistency of charge among the battery cells in the battery device.

[0081] In this embodiment, by further dividing the charge range of the battery's corresponding voltage platform into a first range and a second range at the boundary, and setting corresponding adjustment targets (i.e., the first charge and the second charge) respectively, short-term and precise charge adjustment can be performed for different situations where the first battery charge is in these two ranges. Significant voltage difference can be constructed through short-range adjustment, thereby achieving effective potential difference creation with a small energy adjustment cost, reducing energy loss and redundant adjustment time, improving energy exchange efficiency and the triggering speed of the charge balance strategy.

[0082] In one embodiment, when the charge of the first battery is within the charge range of the corresponding voltage platform, but not within the first or second range, that is, when the charge of the first battery is in the middle region of the charge range of the corresponding voltage platform, the charge of the first battery is adjusted to a point where the difference between the first and second charge is not significant. At this time, the battery management system can control the first battery to discharge to the second battery to reduce the charge of the first battery to the first charge, so that the charge of the first battery can leave the charge range of the corresponding voltage platform and create a significant potential difference between the two battery cells or battery packs. This triggers an automatic charge balancing strategy to induce the natural flow of current inside the battery, thereby achieving effective sensing and active adjustment of the charge between battery cells or battery packs in the battery device. In other embodiments, the battery management system can control the second battery to charge the first battery, thereby increasing the charge of the first battery to a second charge level. This allows the charge of the first battery to move out of the charge range of the corresponding voltage platform and creates a significant potential difference between the two battery cells or battery packs. This triggers an automatic charge balancing strategy to induce the natural flow of current within the battery, achieving effective sensing and active adjustment of the charge between battery cells or battery packs in the battery device.

[0083] In one embodiment, after step S20, that is, after controlling the second battery to exchange energy with the first battery and adjusting the charge of the first battery to a charge range outside the corresponding voltage platform, the method further includes the following steps:

[0084] After a preset resting time, the second battery is controlled to perform reverse energy exchange with the first battery until the first battery and the second battery have the same charge.

[0085] When the charge level of the first battery is within the charge level range of the corresponding voltage platform, the second battery is controlled to exchange energy with the first battery, adjusting the charge level of the first battery to be outside the charge level range of the corresponding voltage platform. A significant potential difference is forcibly generated between the charges of the first and second batteries, and the charge level is adjusted and automatically calibrated and updated within the preset resting time. However, because the charge leveling adjustment process in the charge leveling strategy is relatively slow, and due to differences in the impedance of individual battery cells and electrochemical polarization within the battery device, it may take a long time to adjust the charge level of the individual battery cells to be consistent. Therefore, it may not be possible to achieve consistency in the charge level of the two batteries within the preset resting time.

[0086] To improve the speed of charge balancing adjustment between individual battery cells, after adjusting the charge of the first battery to a level outside the charge range of the corresponding voltage platform to trigger the charge balancing strategy, a preset resting time can be established. This allows the two batteries to perform charge balancing adjustment and calibration updates within the preset time. After the preset resting time, the battery management system can control the second battery to perform reverse energy exchange with the first battery until the charge of the first and second batteries is the same, achieving automatic charge balancing. This rapidly reduces the charge balancing adjustment time of the battery device and improves the efficiency and effectiveness of charge balancing adjustment. The preset resting time is greater than 30 seconds, and its range can be 30 seconds to 10 minutes.

[0087] That is, in one embodiment, after step S202, i.e. after controlling the first battery to discharge to the second battery to reduce the charge of the first battery to the first charge, the method further includes: letting it stand for a preset time, and after the preset time, controlling the second battery to discharge to the first battery until the charge of the first battery and the second battery are the same.

[0088] The first battery's charge is reduced to a first charge level, allowing the battery device to perform charge balancing and calibration updates within a preset resting time. Then, the battery management system can control the second battery to discharge into the first battery, reducing the second battery's charge level and increasing the first battery's charge level until the first and second batteries have the same charge level, achieving automatic charge balancing. This rapidly reduces the charge balancing adjustment time of the battery device and improves the efficiency and effectiveness of charge balancing.

[0089] That is, in one embodiment, after step S203, that is, after controlling the second battery to charge the first battery to increase the charge of the first battery to the second charge, the method further includes the following steps: resting for a preset time, and after resting for a preset time, controlling the first battery to charge the second battery until the charge of the first battery and the second battery are the same.

[0090] The first battery's charge level is increased to a second charge level to trigger a charge balancing strategy, causing the battery device to perform charge balancing adjustment and calibration updates within a preset resting time. Then, the battery management system can control the first battery to charge the second battery, decreasing the first battery's charge level and increasing the second battery's charge level until the first and second batteries have the same charge level, achieving automatic charge balancing, reducing the charge balancing adjustment time within the battery device, and improving the efficiency and effectiveness of charge balancing adjustment.

[0091] In one embodiment, such as Figure 4 As shown, in step S20, when the charge level of the first battery is within the charge level range of the corresponding voltage platform, the second battery is controlled to exchange energy with the first battery to charge and discharge the first battery, thereby adjusting the charge level of the first battery to be outside the charge level range of the corresponding voltage platform. This specifically includes the following steps:

[0092] SA21: When the charge of both the first battery and the second battery is in the first range, control the first battery to discharge to the second battery so as to reduce the charge of the first battery to the first charge level.

[0093] The battery management system monitors the charge capacity of the first and second batteries in the battery device to obtain their respective charge capacity; it then determines whether the charge capacity of the first or second battery falls within a first interval, and executes different energy exchange strategies based on different determination results. The first interval is within the charge capacity interval of the corresponding voltage platform, and the maximum value of the first interval is less than the center value of the charge capacity interval of the corresponding voltage platform. The first charge capacity is less than the minimum value of the first interval.

[0094] Specifically, when the charge levels of both the first and second batteries are within a first range, the first battery is controlled to discharge into the second battery to reduce its charge level to the first charge level, and then left to stand for a first preset time. The first preset time is a value greater than 5 minutes, and its value can range from 5 minutes to 10 minutes. In this embodiment, the first preset time can be 10 minutes.

[0095] For example, the first battery can be used as the current output terminal, and the second battery as the current input terminal. Current from the first battery flows into the second battery to facilitate energy exchange between them until the charge of the first battery decreases to a first charge level, making its charge less than the minimum value of the charge range corresponding to the voltage platform. This triggers a voltage-based charge balancing strategy to adjust the battery charge balance, inducing natural current flow between individual battery cells within the battery device during a first preset rest period, thereby achieving charge balancing of the individual battery cells. Furthermore, during this first preset period, if the battery charge changes significantly, a battery charge calibration strategy can be triggered to update the charge of all batteries, improving charge accuracy.

[0096] SA22: After a first preset time of rest, control the second battery to discharge to the first battery so as to reduce the charge of the second battery to the first charge.

[0097] After a settling period of time, the battery management system can use the second battery as the current output terminal and the first battery as the current input terminal, controlling the current from the second battery to flow into the first battery to exchange energy between them until the charge of the first battery rises to the second charge, making the charge of the second battery greater than the maximum value of the charge range of the corresponding voltage platform. This triggers a voltage-based charge balancing strategy to adjust the battery charge balance, thereby inducing the natural flow of current between the individual battery cells in the battery device within the settling period of time, thus achieving charge balance between the individual battery cells and the battery pack in the battery device.

[0098] In this embodiment, when the charge levels of both the first and second batteries are within the first interval of the charge level range corresponding to the voltage platform, the first battery is first controlled to discharge to the second battery. After a certain period of rest, the discharge is reversed, with the second battery discharging to the first battery. This collaboratively lowers the charge levels of both batteries to outside the voltage platform range, allowing the first and second batteries to trigger the charge balancing strategy sequentially within a short time, thus achieving charge balancing within the battery device. Compared to adjusting the first battery individually each time, this solution, through the collaborative charging and discharging of the first and second batteries, allows their charges to move away from the platform range together. This not only improves the efficiency of potential difference construction and balancing speed, and reduces the discharge burden on a single battery, but also enhances the accuracy of subsequent charge level calibration, thereby achieving a more efficient, low-loss, and lifespan-friendly charge level control strategy.

[0099] In one embodiment, after step SA22, i.e., after controlling the second battery to discharge to the first battery to reduce the charge of the second battery to the first charge, the method further includes the following steps:

[0100] SA223: After a second preset time of rest, the first battery is controlled to discharge to the second battery again until the first battery and the second battery have the same charge.

[0101] The second preset duration is a value greater than 5 minutes, and the value of the second preset duration can be between 5 minutes and 10 minutes. For example, the second preset duration can be 10 minutes.

[0102] After controlling the second battery to discharge into the first battery to reduce the charge of the second battery to the first charge level, the battery is left to stand still for a second preset time. After triggering the charge balancing strategy, active charge balancing adjustment and battery charge calibration are performed within the second preset time. After standing still for the second preset time, the current from the first battery is controlled to flow into the second battery again to reduce the charge of the first battery and increase the charge of the second battery until the charge of the first battery and the second battery are the same, ensuring the charge consistency between the two batteries and improving the speed of charge balancing adjustment between individual battery cells.

[0103] After two rounds of charge adjustment, the charge levels of the first and second batteries successively deviate from the voltage plateau region, triggering a passive charge balancing operation. However, due to the slow speed of this passive charge balancing, and because of differences in the impedance of individual cells and electrochemical polarization within the battery device, it may not be possible to achieve charge consistency between the two batteries within a second preset time period. In this embodiment, after controlling the second battery to discharge into the first battery to reduce the charge level of the second battery to the first charge level, the battery is left to stand for a second preset time period. After standing for the second preset time period, the first battery is again controlled to discharge into the second battery until the charge levels of the first and second batteries are the same. This eliminates residual deviations in the previous adjustment process, improves the final charge consistency, and enhances the balancing effect.

[0104] In one embodiment, step SA21, where the charge levels of both the first and second batteries are within a first range, involves controlling the first battery to discharge into the second battery to reduce the charge level of the first battery to the first charge level. This specifically includes the following steps:

[0105] SA211: When the charge capacity of the first battery is in the first range and the charge capacity of multiple second batteries is also in the first range, the target battery is identified among the multiple second batteries whose charge capacity is in the first range.

[0106] The target battery is the second battery whose charge is in the first range and whose charge difference with the first battery is the smallest.

[0107] When the charge of the first battery is in the first range and the charge of multiple second batteries is also in the first range, the battery management system can identify the second battery with the smallest charge difference from the first battery among the multiple second batteries with charge in the first range, and use it as the target battery for energy conversion with the first battery. This can reduce the amount of energy transferred and improve the energy conversion speed.

[0108] SA212: When the charge of the first battery is less than or equal to that of the target battery, the first battery is controlled to discharge to the target battery in order to reduce the charge of the first battery to the first charge level.

[0109] The battery management system compares the charge capacity of a first battery and a target battery. If the charge capacity of the first battery is less than or equal to that of the target battery, it first controls the first battery to discharge into the target battery. This means controlling the current from the first battery to flow into the target battery (i.e., the second battery whose charge capacity is in the first range and has the smallest difference from the first battery's charge capacity), thereby reducing the charge capacity of the first battery and increasing the charge capacity of the target battery, until the charge capacity of the first battery is reduced to the first charge capacity. Then, after a first preset resting time, it controls the target battery to discharge into the first battery, reducing its charge capacity to the first charge capacity. After a second preset resting time, it again controls the first battery to discharge into the target battery, until the charge capacity of the first and target batteries are the same, achieving active charge balancing and improving charge balancing efficiency.

[0110] Taking a first charge level of 15% as an example, the first battery Pack A and the second battery Pack B both have a charge level of 30%. The charge levels of Pack A and Pack B are determined to be within a first range, and the difference in charge level between Pack A and Pack B is minimized. At this point, the battery management system uses Pack B as the target battery for energy exchange with Pack A, executing steps 1 to 4 to achieve energy exchange and passive charge leveling. Specifically, Pack A is controlled to discharge to Pack B to reduce its charge level to 15%, and then left to stand for a first preset time, such as 10 minutes. After the first preset time, Pack B is controlled to discharge to Pack A to reduce its charge level to 15%, and then left to stand for a second preset time, such as 10 minutes. After a second preset time of rest, control the first battery PackA to discharge again until the first battery PackA and the target battery PackB have the same charge capacity of 30%, thus completing the charge balance between the two and stopping the energy exchange process.

[0111] When the charge capacity of the first battery is greater than or equal to that of the target battery, the target battery is first controlled to discharge the first battery, that is, the current from the target battery is controlled to flow into the input first battery to increase the charge capacity of the first battery until the charge capacity of the first battery is increased to a second charge capacity. Then, after resting for a first preset time, the first battery is controlled to discharge the target battery to increase the charge capacity of the target battery to a second charge capacity. After resting for a second preset time, the target battery is controlled to discharge the first battery again until the charge capacity of the first battery and the target battery are the same, thereby achieving active charge capacity balancing between the two and improving charge capacity balancing efficiency.

[0112] In this embodiment, when the charge capacity of the first battery is within a first range, and the charge capacity of multiple second batteries is also within the first range, a target battery is identified among the multiple second batteries with charge capacity within the first range. The target battery is the second battery with the smallest charge capacity difference from the first battery. If the charge capacity of the first battery is less than or equal to that of the target battery, the first battery is controlled to discharge towards the target battery to reduce its charge capacity to the first charge capacity. By selecting the target battery with the smallest charge capacity difference from the first battery among multiple candidate batteries for discharge pairing, and prioritizing the adjustment of batteries with charge capacity closer to the first charge capacity, not only can the energy migration required for adjustment be reduced and the adjustment speed improved, but the adjustment current amplitude can also be reduced, error accumulation reduced, and charge capacity adjustment accuracy improved.

[0113] In one embodiment, such as Figure 5 As shown, in step S20, when the charge level of the first battery is within the charge level range of the corresponding voltage platform, the second battery is controlled to exchange energy with the first battery to charge and discharge the first battery, thereby adjusting the charge level of the first battery to be outside the charge level range of the corresponding voltage platform. This specifically includes the following steps:

[0114] SB21: When the charge levels of both the first and second batteries are in the second range, control the second battery to charge the first battery to increase the charge level of the first battery to the second charge level.

[0115] The battery management system monitors the charge levels of the first and second batteries in the battery device to obtain their respective charge levels. It then determines whether the charge level of either the first or second battery falls within a second range, executing different energy exchange strategies based on the determination results. The second range is within the charge level range of the corresponding voltage platform, and the minimum value of the second range is greater than the center value of the charge level range of the corresponding voltage platform. The second charge level is greater than the maximum value of the second range; for example, the second charge level could be 96%.

[0116] Specifically, when the charge levels of both the first and second batteries are within the second range, the first battery is controlled to charge the second battery to raise its charge level to the second charge level, and then the battery remains stationary for a third preset time. The third preset time is a value greater than 5 minutes, and its value can range from 5 minutes to 10 minutes. For example, the third preset time could be 10 minutes.

[0117] For example, the second battery can be used as the current output terminal, and the first battery as the current input terminal. Current from the second battery can be controlled to flow into the first battery to facilitate energy exchange between them until the charge level of the first battery rises to a second charge level, making the charge level of the first battery greater than the maximum value of the charge level range corresponding to the voltage platform. This triggers a voltage-based charge balancing strategy to adjust the charge level, inducing natural current flow between individual battery cells within the battery device during a third preset rest period, thereby achieving charge balancing between individual battery cells and the battery pack. Furthermore, during this third preset period, if a significant change in battery charge level occurs, a battery charge calibration strategy can be triggered to calibrate the battery charge level, improving charge level accuracy.

[0118] SB22: After a third preset time of rest, control the first battery to charge the second battery to increase the charge level of the second battery to the second charge level.

[0119] After a settling period of four preset times, the battery management system can use the first battery as the current output terminal and the second battery as the current input terminal, controlling the current from the first battery to flow into the second battery to exchange energy between them until the charge of the second battery increases to the second charge level, making the charge of the second battery greater than the maximum value of the charge range of the corresponding voltage platform. This triggers a voltage-based charge balancing strategy to perform charge balancing adjustment, thereby inducing the natural flow of current between the individual battery cells in the battery device within a settling period of three preset times, thus achieving charge balancing between the individual battery cells and the battery pack in the battery device.

[0120] In this embodiment, when the charge levels of both the first and second batteries are within the second range of the charge level range corresponding to the voltage platform, the second battery is first controlled to discharge to the first battery. After a certain period of rest, the discharge is reversed, from the first battery to the second battery, thus coordinating the charge levels of both batteries to be lowered outside the voltage platform range. This allows the first and second batteries to trigger a charge balancing strategy sequentially within a short period, achieving charge balancing within the battery device. Compared to adjusting the first battery individually each time, this solution, through coordinated charging and discharging of the first and second batteries, allows their charges to move away from the platform range together. This not only improves the efficiency of potential difference construction and balancing speed, and reduces the discharge burden on a single battery, but also enhances the accuracy of subsequent charge level calibration. This results in a more efficient and low-loss charge leveling strategy, improving battery performance and lifespan.

[0121] In one embodiment, after step SB22, i.e., after controlling the first battery to charge the second battery to increase the charge capacity of the second battery to a second charge capacity, the method further includes the following steps:

[0122] SB223: After a fourth preset time of rest, control the second battery to charge the first battery again until the first battery and the second battery have the same charge.

[0123] The fourth preset duration is a value greater than 5 minutes, and the value of the fourth preset duration can be between 5 minutes and 10 minutes. For example, the fourth preset duration can be 10 minutes.

[0124] After controlling the first battery to charge the second battery to increase the second battery's charge level to a second charge level, the system remains stationary for a fourth preset time. This allows for the activation of a charge balancing strategy, during which active charge balancing adjustment and battery charge calibration are performed. After the fourth preset time, current from the second battery flows into the first battery again to increase the first battery's charge level and decrease the second battery's charge level until the first and second batteries have the same charge level. This improves the charge consistency between the two batteries and increases the speed of charge balancing adjustment between individual battery cells.

[0125] After two rounds of charge adjustment, the charge levels of the first and second batteries successively deviate from the voltage plateau region, triggering a passive charge balancing operation. However, due to the slow speed of this passive charge balancing, and because of differences in the impedance of individual battery cells and electrochemical polarization within the battery device, it may not be possible to achieve charge consistency between the two batteries within a fourth preset time period. In this embodiment, after controlling the first battery to charge the second battery to raise its charge level to the second charge level, the battery is left to rest for a fourth preset time period. After this fourth preset time period, the second battery is then controlled to charge the first battery again until the charge levels of the first and second batteries are the same. This eliminates residual deviations from the previous adjustment process, improves the final charge consistency, and enhances the balancing effect.

[0126] In one embodiment, step SB21, where the charge levels of both the first and second batteries are within the second range, involves controlling the second battery to charge the first battery to increase its charge level to the second range. This specifically includes the following steps:

[0127] SB211: When the charge capacity of the first battery is in the second range and the charge capacity of multiple second batteries is also in the second range, the target battery is identified among the multiple second batteries whose charge capacity is in the second range.

[0128] The target battery is the second battery whose charge level is in the second range and whose charge level difference with the first battery is the smallest. When the first battery's charge level is in the second range, and multiple second batteries also have charges in the second range, the battery management system can identify the second battery with the smallest charge level difference from the first battery among these batteries and use it as the target battery for energy conversion with the first battery. This reduces the amount of energy transferred between the two batteries and increases the energy conversion speed.

[0129] SB212: When the charge of the first battery is greater than or equal to that of the target battery, the target battery is controlled to charge the first battery to increase the charge of the first battery to a second charge level.

[0130] The battery management system compares the charge capacity of a first battery and a target battery. If the charge capacity of the first battery is greater than or equal to that of the target battery, it first controls the target battery to discharge into the first battery. This means controlling the current flowing from the target battery (i.e., the second battery whose charge capacity is in the first range and has the smallest difference from the first battery's charge capacity) into the first battery, increasing the first battery's charge capacity and decreasing the target battery's charge capacity, until the first battery's charge capacity is increased to the second charge capacity. Then, after a third preset rest period, it controls the first battery to discharge into the target battery, increasing the target battery's charge capacity to the second charge capacity. After a fourth preset rest period, it controls the target battery to discharge into the first battery again, until the first and target batteries have the same charge capacity, achieving active charge balancing and improving charge balancing efficiency.

[0131] Taking a second charge level of 98% as an example, the charge levels of both the first battery Pack A and the second battery Pack B are 80%. This determines that the charge levels of Pack A and Pack B are within the second range, and the difference in charge level between the first battery Pack A and the second battery Pack B is minimized. At this point, the battery management system uses the second battery Pack B as the target battery for energy exchange with the first battery Pack A, executing steps 1 to 4 to achieve energy exchange and passive charge leveling. Specifically, the first battery Pack A is controlled to charge the target battery Pack B to raise its charge level to 98%, and then the charge level is left to stand for a third preset time. After the third preset time, the target battery Pack B is controlled to charge and discharge the first battery Pack A to raise its charge level to 98%, and then the charge level is left to stand for a fourth preset time. After a fourth preset time period, the first battery PackA is controlled to charge the target battery PackB again until the first battery PackA and the target battery PackB have the same charge level of 80%, thus completing the charge balance between the two and stopping the energy exchange process. The third and fourth preset time periods can be 10 minutes.

[0132] When the charge capacity of the first battery is less than or equal to that of the target battery, the first battery is first controlled to discharge the target battery, that is, the current from the first battery is controlled to flow into the target battery to increase the charge capacity of the target battery until it reaches the second charge capacity. Then, after a third preset resting time, the target battery is controlled to discharge the first battery to increase its charge capacity to the second charge capacity. After a fourth preset resting time, the first battery is controlled to discharge the target battery again until the charge capacity of the first battery and the target battery are the same, thus achieving active charge balance between the two batteries and improving charge balance efficiency.

[0133] In this embodiment, when the charge capacity of the first battery is within the second range, and the charge capacity of multiple second batteries is also within the second range, a target battery is identified among the multiple second batteries with charge capacity within the second range. The target battery is the second battery with the smallest charge capacity difference from the first battery. If the charge capacity of the first battery is greater than or equal to that of the target battery, the target battery is controlled to charge the first battery to increase its charge capacity to the second charge capacity. By selecting the target battery with the smallest charge capacity difference from the first battery among multiple candidate batteries for discharge pairing, and prioritizing the adjustment of batteries with charge capacity closer to the second charge capacity, not only can the energy migration required for adjustment be reduced and the adjustment speed improved, but the adjustment current amplitude can also be reduced, error accumulation reduced, and charge capacity adjustment accuracy improved.

[0134] In one embodiment, both the first battery and the second battery are individual battery cells. Figure 6 As shown, after step S10, that is, after obtaining the charge of the first battery in the battery device, the method further includes the following steps:

[0135] S40: If the charge of the first battery is abnormal, the charge of the first battery is calibrated according to the charge of multiple individual cells in the battery pack to which the first battery is located.

[0136] During the operation of the battery device, the battery management system monitors the charge of multiple batteries in the battery device to obtain the charge of the first battery and the charge of the second battery, and determines whether there are any abnormalities in the charge of the first battery and the second battery.

[0137] Specifically, if the difference between the charge capacity of the first battery and a preset charge capacity is greater than a preset difference, the charge capacity of the first battery is determined to be abnormal. The preset charge capacity is the average charge capacity of multiple battery cells in the battery pack containing the first battery. By comparing the first battery with the average charge capacity of the battery cells in the battery pack, the abnormal battery cells with large charge capacity deviations are quickly identified.

[0138] In the event of an abnormal charge level in the first battery, the charge level of the first battery can be calibrated based on the charge levels of multiple individual cells in the battery pack to reduce the charge level difference between the first battery and other first batteries, ensure the accuracy of the charge level of the first battery, and solve the problem of overcharging or over-discharging caused by charge level deviation during battery charging and discharging. This helps to improve the safety, consistency and cycle life of the overall battery device.

[0139] In one embodiment, both the first battery and the second battery are individual battery cells. Figure 7 As shown, step S40, which involves calibrating the charge capacity of the first battery based on the charge capacity of the multiple individual cells in the battery pack containing the first battery, specifically includes the following steps:

[0140] S41: Identify a reference cell among the multiple cell units in the battery pack containing the first cell.

[0141] The reference battery is a single battery cell whose charge meets a preset condition. For example, the reference battery could be the second battery among the multiple battery cells in the same battery pack as the first battery, whose charge has the smallest difference from the preset charge. Alternatively, the reference battery could be the second battery among the multiple battery cells in the same battery pack as the first battery, whose charge has the largest difference from the first battery.

[0142] S42: Control the first battery to exchange energy with the reference battery in order to calibrate the charge of the first battery to the target charge.

[0143] The target charge capacity is calibrated based on the charge capacity of a reference battery. For example, the target charge capacity can be the charge capacity of the reference battery. In other embodiments, the target charge capacity can also be the average charge capacity of multiple battery cells in the battery pack containing the first battery, excluding the first battery itself. In other embodiments, the target charge capacity can also be calibrated based on the charge capacity of the reference battery and the charge capacity of the first battery after charge capacity calibration and updating.

[0144] When the difference between the charge capacity of the first battery and the preset charge capacity is greater than the preset difference, that is, when there are battery cells with large charge capacity deviations in the battery device, the battery management system can control the first battery to exchange energy with the reference battery, such as controlling the first battery to exchange current with the reference battery, so as to calibrate the charge capacity of the first battery to the target charge capacity.

[0145] For example, if the charge capacity of the first battery is greater than the target charge capacity, indicating an anomaly in the charge capacity of the first battery, the battery management system can use the first battery as the current output terminal and the reference battery as the current input terminal, controlling the current input from the first battery to the reference battery to reduce the charge capacity of the first battery until it reaches the target charge capacity. Conversely, if the charge capacity of the first battery is less than the target charge capacity, the battery management system can use the reference battery as the current output terminal and the first battery as the current input terminal, controlling the current input from the reference battery to the first battery to increase the charge capacity of the first battery until it reaches the target charge capacity.

[0146] In other embodiments, the first battery can be controlled to exchange energy with the reference battery to balance the battery charge and calibrate and update the charge of the first battery. After calibrating and updating the first battery, the first battery is controlled to exchange energy with the reference battery again to calibrate the charge of the first battery to the target charge, which can improve the accuracy of charge regulation.

[0147] In this embodiment, after monitoring the charge of the first battery in the battery device, if the difference between the charge of the first battery and the preset charge is greater than the preset difference, it is determined that the charge of the first battery is abnormal. Then, a reference battery is identified in the battery pack containing the first battery. The reference battery is a single battery cell whose charge meets the preset condition, and the preset charge is the average charge of multiple single battery cells in the battery pack containing the first battery. Energy exchange is controlled between the first battery and the reference battery to calibrate the charge of the first battery to the target charge, which is calibrated based on the charge of the reference battery. This scheme can effectively identify and correct single battery cells with large charge deviations, reducing the charge difference between the single battery cell and other single battery cells in the battery pack, and realigning its state of charge with that of the other single battery cells in the battery pack. This effectively solves the problem of overcharging or over-discharging caused by charge deviations during battery charging and discharging, and helps improve the overall safety, consistency, and cycle life of the battery device.

[0148] In one embodiment, such as Figure 8 As shown, step S42, which involves controlling the first battery to exchange energy with the reference battery to calibrate the charge capacity of the first battery to the target charge capacity, specifically includes the following steps:

[0149] S421: Control the first battery to exchange energy with the reference battery, and adjust the charge of the first battery to a preset charge outside the charge range of the corresponding voltage platform.

[0150] S422: Control the first battery and the reference battery to perform charge balance adjustment and update the charge of the first battery.

[0151] The preset charge level refers to the charge level outside the charge level range of the corresponding voltage platform, and the difference between the preset charge level and the charge level of the first battery (or reference battery) before adjustment is greater than the preset difference. The charge level of the first battery before adjustment is the charge level of the first battery before it exchanges energy with the reference battery. The preset difference is a pre-calibrated charge level difference that is sufficient to trigger a passive balancing strategy due to a change in the potential difference between battery cells.

[0152] If the difference between the charge capacity of the first battery and the preset charge capacity is greater than the preset difference, the battery management system can first control the first battery to exchange energy with the reference battery, adjust the charge capacity of the first battery to a preset charge capacity outside the charge capacity range of the corresponding voltage platform, so that the charge transfer between the first battery and the reference battery can generate a certain potential difference, thereby triggering the charge balancing strategy to automatically balance the charge capacity between the two.

[0153] For example, the preset charge capacity includes a first preset value and a second preset value. The first preset value is less than the minimum value of the charge capacity range of the corresponding voltage platform, and the second preset value is greater than the maximum value of the charge capacity range of the corresponding voltage platform. Furthermore, the differences between the first preset value, the second preset value, and the charge capacity of the first battery before adjustment are all greater than preset differences. When the charge capacity of the first battery is less than the maximum value of the first range, the battery management system can use the first battery as the current output terminal and the reference current as the current input terminal, controlling the current input from the first battery to the reference battery to reduce the charge capacity of the first battery to the first preset value. This triggers a charge capacity balancing strategy, inducing a natural current flow between the two batteries for automatic charge capacity balancing adjustment.

[0154] When the charge capacity of the first battery exceeds the minimum value of the second range, the battery management system can use the first battery as the current input and the reference current as the current output, controlling the current input from the reference battery to the first battery to increase the charge capacity of the first battery to the second preset value. This triggers a charge balancing strategy, inducing a natural current flow between the two batteries for automatic charge balancing. Different charging and discharging operations are performed on the first battery according to its different charge capacity ranges, allowing it to quickly reach the nearest preset charge capacity value, thus improving the charge balancing startup speed and charge update efficiency.

[0155] Since the current and charge level of the first battery change after the automatic charge leveling strategy is triggered, the charge level of the first battery can be predicted using the ampere-hour integration method or the open-circuit voltage method based on the current current or voltage of the first battery. The predicted charge level is then used to update the charge level of the first battery, completing the charge level calibration update. Similarly, the charge level of the reference battery can be predicted using the ampere-hour integration method or the open-circuit voltage method based on the current current or voltage of the reference battery, and the predicted charge level is then used to update the charge level of the reference battery, completing the charge level calibration update.

[0156] After adjusting the charge capacity of the first battery to a preset charge capacity outside the charge capacity range of the corresponding voltage platform to trigger the charge capacity balancing strategy and updating the charge capacity of the first battery and the reference battery, the average charge capacity of the updated first battery and the updated reference battery is determined as the target charge capacity. That is, the target charge capacity is the average charge capacity of the reference battery and the updated charge capacity of the first battery.

[0157] S423: After updating the charge level of the first battery, control the reference battery to exchange energy with the first battery again to adjust the charge level of the first battery to the target charge level.

[0158] After updating the charge levels of the first and reference batteries, the battery management system can again control the reference battery to perform reverse energy exchange with the first battery to adjust the charge level of the first battery to the target charge level, that is, to adjust the charge level of the first battery to the average charge level of the first and reference batteries.

[0159] Taking a first preset value of 15% as an example, if the charge of both the first battery cell 1 and the reference battery cell 2 is 30%, and the charge of the first battery cell 1 is determined to be less than the maximum value of the first interval, the battery management system controls the reference battery cell 2 and the first battery cell 1 to execute steps 1 to 4 to exchange energy and achieve charge calibration update and passive charge balancing adjustment. That is, the first battery cell 1 is controlled to discharge to the reference battery cell 2 to reduce the charge of the first battery cell 1 to 15%. After the charge of the first battery cell 1 is reduced to 15%, it can be left to stand still for a preset time to perform charge balancing adjustment and charge calibration update. After standing still for the preset time and updating the charge of the two battery cells, the reference battery cell 2 is controlled to discharge to the first battery cell 1 until the first battery cell 1 and the reference battery cell 2 have the same charge of 34%, completing the charge calibration update and charge balancing between the two, and stopping the energy exchange process.

[0160] In this embodiment, when a large deviation in the charge capacity of a single battery cell is detected, the deviated battery cell is first adjusted to a preset charge capacity for charge calibration update. Then, the charge capacity of the deviated battery cell is balanced with the charge capacity of the reference battery in the battery pack. Through two-stage energy regulation, the charge capacity of the deviated battery cell can be quickly calibrated to a level close to that of the reference battery, improving the accuracy of charge capacity calibration, restoring the consistency of charge capacity between battery cells, reducing premature protection triggering, capacity waste, or system failure caused by charge capacity inconsistency, and improving the stability, safety, and effective capacity utilization of the battery device.

[0161] In one embodiment, the preset charge capacity includes a first preset value and a second preset value. Step S421, which involves controlling the first battery to exchange energy with the reference battery and adjusting the charge capacity of the first battery to a preset charge capacity outside the charge capacity range of the corresponding voltage platform, specifically includes the following steps:

[0162] S4211: When the charge of the first battery is less than the maximum value of the first interval and less than the charge of the reference battery, the first battery is controlled to discharge to the reference battery to reduce the charge of the first battery to a first preset value.

[0163] When the charge of the first battery is less than the maximum value of the first interval and less than the charge of the reference battery, the battery management system can use the first battery as the current output terminal and the reference current as the current input terminal, control the current input of the first battery to the reference battery, so as to reduce the charge of the first battery to the first preset value, thereby triggering the charge balancing strategy to perform charge balancing adjustment, so as to induce the natural flow of current between the two and perform automatic charge balancing adjustment between the two.

[0164] When the charge of the first battery is less than the maximum value of the first interval and less than the charge of the reference battery, the first battery is controlled to discharge to the reference battery. This can reduce the situation where the charge of the first battery cannot be adjusted to the second preset value even if energy conversion is performed because the charge of the first battery and the second battery are too large. This ensures the normal triggering of the charge balancing strategy and the normal calibration and update of the charge.

[0165] The preset charge capacity includes a first preset value and a second preset value. The first preset value is less than the minimum value of the charge capacity range of the corresponding voltage platform, and the second preset value is greater than the maximum value of the charge capacity range of the corresponding voltage platform. That is, the first preset value is less than the second preset value, and the differences between the first preset value, the second preset value and the charge capacity of the first battery before adjustment are all greater than the preset difference.

[0166] S4212: When the charge of the first battery is greater than the minimum value of the second interval and greater than the charge of the reference battery, control the reference battery to charge the first battery so as to increase the charge of the first battery to a second preset value.

[0167] When the charge of the first battery is greater than the minimum value of the second range and greater than the charge of the reference battery, the battery management system can use the first battery as the current input terminal and the reference current as the current output terminal, control the current input of the reference battery to the first battery to increase the charge of the first battery to the second preset value, thereby triggering the charge balancing strategy to induce the natural flow of current between the two and perform automatic charge balancing adjustment between the two.

[0168] When the charge of the first battery is greater than the minimum value of the second range and greater than the charge of the reference battery, the reference battery is controlled to charge the first battery. This can reduce the situation where the charge of the first battery cannot be adjusted to the second preset value even if energy conversion is performed because the charge of the first battery and the second battery are too small. This ensures the normal triggering of the charge balancing strategy and the normal calibration and update of the charge.

[0169] In this embodiment, when the charge capacity of the first battery is less than the maximum value of the first interval and less than the charge capacity of the reference battery, the first battery is controlled to discharge to the reference battery to reduce its charge capacity to a first preset value. When the charge capacity of the first battery is greater than the minimum value of the second interval and greater than the charge capacity of the reference battery, the reference battery is controlled to charge the first battery to increase its charge capacity to a second preset value. This reduces the possibility that the charge balancing strategy cannot be triggered because the charge capacity of the first and second batteries is too small or too large, and the corresponding preset value cannot be reached after energy conversion. It ensures that the charge balancing strategy is triggered normally to automatically balance and adjust the charge capacity between the two batteries, thereby achieving charge calibration and update.

[0170] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0171] In one embodiment, a battery management system is provided, which corresponds one-to-one with the battery management system methods described in the above embodiments. For example... Figure 9 As shown, the battery management system includes an acquisition module 111, a control module 112, and an equalization module 113. Detailed descriptions of each functional module are as follows:

[0172] The acquisition module 111 is used to acquire the charge of the first battery in the battery device;

[0173] The control module 112 is used to control the second battery to exchange energy with the first battery when the charge of the first battery is within the charge range of the corresponding voltage platform, so as to adjust the charge of the first battery to a charge outside the charge range of the corresponding voltage platform.

[0174] The equalization module 113 is used to control the first battery and the second battery to perform charge equalization adjustment.

[0175] In one embodiment, the control module 112 is specifically configured to: when the charge capacity of the first battery is in a first range, control the first battery to discharge to the second battery to reduce the charge capacity of the first battery to a first charge capacity, which is less than the minimum value of the first range; when the charge capacity of the first battery is in a second range, control the second battery to charge the first battery to increase the charge capacity of the first battery to a second charge capacity, which is greater than the maximum value of the second range; both the first range and the second range are within the charge capacity range of the corresponding voltage platform, and the maximum value of the first range is less than the center value of the charge capacity range of the corresponding voltage platform, and the minimum value of the second range is greater than the center value of the charge capacity range of the corresponding voltage platform.

[0176] In one embodiment, the control module 112 is further configured to: control the first battery to discharge to the second battery when the charge of the first battery and the second battery are both in the first range, so as to reduce the charge of the first battery to the first charge; and control the second battery to discharge to the first battery after a first preset time period of rest, so as to reduce the charge of the second battery to the first charge.

[0177] In one embodiment, the control module 112 is further configured to: reduce the charge of the second battery to the first charge, then allow it to stand for a second preset time, and after the second preset time, control the first battery to discharge to the second battery again until the charge of the first battery and the second battery are the same.

[0178] In one embodiment, the control module 112 is further configured to: when the charge of the first battery is in a first range and the charge of multiple second batteries is also in the first range, determine a target battery among the multiple second batteries whose charge is in the first range, wherein the target battery is the second battery whose charge difference with the first battery is the smallest; and when the charge of the first battery is less than or equal to the target battery, control the first battery to discharge to the target battery so as to reduce the charge of the first battery to the first charge.

[0179] In one embodiment, the control module 112 is further configured to: when the charge levels of both the first battery and the second battery are within a second range, control the second battery to charge the first battery to increase the charge level of the first battery to the second charge level; after a third preset rest period, control the first battery to charge the second battery to increase the charge level of the second battery to the second charge level; the second range is within the charge level range of the corresponding voltage platform, the minimum value of the second range is greater than the center value of the charge level range of the corresponding voltage platform, and the second charge level is greater than the maximum value of the second range.

[0180] In one embodiment, the control module 112 is further configured to: after increasing the charge of the second battery to a second charge level, leave it idle for a fourth preset time, and after leaving it idle for a fourth preset time, control the second battery to charge the first battery again until the charge levels of the first battery and the second battery are the same.

[0181] In one embodiment, the control module 112 is further configured to: when the charge capacity of the first battery is in a second range and the charge capacity of multiple second batteries is also in the second range, determine a target battery among the multiple second batteries whose charge capacity is in the second range, wherein the target battery is the second battery with the smallest charge capacity difference from the first battery; and when the charge capacity of the first battery is greater than or equal to that of the target battery, control the target battery to charge the first battery to increase the charge capacity of the first battery to the second charge capacity.

[0182] In one embodiment, the first battery is a single battery cell. The control module 112 is further configured to: after acquiring the charge of the first battery in the battery device, if the charge of the first battery is abnormal, calibrate the charge of the first battery according to the charge of multiple battery cells in the battery pack to which the first battery is located.

[0183] In one embodiment, the control module 112 is further configured to: determine that the charge of the first battery is abnormal when the difference between the charge of the first battery and the preset charge is greater than the preset difference, wherein the preset charge is the average charge of multiple battery cells in the battery pack in which the first battery is located.

[0184] In one embodiment, the control module 112 is further configured to: calibrate the charge capacity of the first battery according to the charge capacity of multiple battery cells in the battery pack where the first battery is located, including: determining a reference battery among the multiple battery cells in the battery pack where the first battery is located, wherein the reference battery is a battery cell whose charge capacity meets a preset condition; controlling the first battery to exchange energy with the reference battery to calibrate the charge capacity of the first battery to a target charge capacity, wherein the target charge capacity is calibrated according to the charge capacity of the reference battery.

[0185] In one embodiment, the control module 112 is further configured to: control the first battery to exchange energy with the reference battery, adjusting the charge of the first battery to a preset charge outside the charge range of the corresponding voltage platform; control the first battery and the reference battery to perform charge balancing adjustment and update the charge of the first battery, wherein the difference between the preset charge and the charge of the first battery before adjustment is greater than the preset difference; and after updating the charge of the first battery, control the reference battery to perform reverse energy exchange with the first battery to adjust the charge of the first battery to a target charge, wherein the target charge is the average charge of the updated first battery and the reference battery.

[0186] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0187] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0188] This application also provides an electronic device, such as... Figure 10 As shown, the electronic device 12 includes: at least one processor 121, a memory 122, and a computer program 123 stored in the memory 122 and executable on the at least one processor 121. When the processor 121 executes the computer program 123, it implements the steps in any of the above-described method embodiments, or when the processor 121 executes the computer program 123, it implements the functions of each module / unit in the above-described device embodiments. For example, the computer program 123 may be divided into one or more modules / units, which are stored in the memory 122 and executed by the processor 121 to complete this application. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 123 in the electronic device.

[0189] Those skilled in the art will understand that Figure 10 The electronic device described is merely an example and does not constitute a limitation on the electronic device. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0190] The processor described above can be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The memory can be an internal storage unit of the electronic device, such as a hard disk or RAM. The memory can also be an external storage device of the electronic device, such as a plug-in hard disk, smart memory card, secure digital card, flash memory card, etc. Furthermore, the memory can include both internal and external storage units of the electronic device.

[0191] This application also provides a readable storage medium storing a computer program that, when executed by a processor, implements the steps described in the various method embodiments above.

[0192] This application provides a computer program product that, when run on an electronic device, enables the electronic device to perform the steps described in the various method embodiments above.

[0193] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0194] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0195] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0196] In the embodiments provided in this application, it should be understood that the disclosed apparatus / devices and methods can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0197] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0198] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery control method, characterized in that, include: Obtain the charge of the first battery in the battery device; When the charge of the first battery is within the charge range of its voltage platform, controlling the second battery to exchange energy with the first battery to adjust the charge of the first battery to be outside the charge range of its voltage platform includes: when the charge of the first battery is within a first range, controlling the first battery to discharge to the second battery to reduce the charge of the first battery to a first charge, the first charge being less than the minimum value of the first range; the first range is within the charge range of the voltage platform of the first battery, and the maximum value of the first range is less than the center value of the charge range of the voltage platform of the first battery; Control the first battery and the second battery to perform charge balance adjustment.

2. The battery control method according to claim 1, wherein The step of controlling the second battery to exchange energy with the first battery when the charge of the first battery is within the charge range of its voltage platform, thereby adjusting the charge of the first battery to be outside the charge range of its voltage platform, further includes: When the charge of the first battery is in the second range, the second battery is controlled to charge the first battery to increase the charge of the first battery to the second charge, which is greater than the maximum value of the second range. The second interval is within the charge range of the voltage platform of the first battery, and the minimum value of the second interval is greater than the center value of the charge range of the voltage platform of the first battery.

3. The battery control method according to claim 1, wherein When the charge level of the first battery is within the charge level range of its voltage platform, controlling the second battery to exchange energy with the first battery to adjust the charge level of the first battery to outside the charge level range of its voltage platform, further includes: When the charge levels of both the first battery and the second battery are within the first range, the first battery is controlled to discharge to the second battery to reduce the charge level of the first battery to the first charge level. After a first preset time of rest, the second battery is controlled to discharge into the first battery to reduce the charge of the second battery to the first charge. The first interval is within the charge range of the voltage platform of the first battery, and the maximum value of the first interval is less than the center value of the charge range of the voltage platform of the first battery; the first charge is less than the minimum value of the first interval.

4. The battery control method according to claim 3, wherein After reducing the charge of the second battery to the first charge, the method further includes: After a second preset time period of rest, the first battery is controlled to discharge to the second battery again until the first battery and the second battery have the same charge.

5. The battery control method as described in claim 3, characterized in that, When the charge levels of both the first battery and the second battery are within a first range, controlling the first battery to discharge into the second battery to reduce the charge level of the first battery to the first charge level includes: When the charge of the first battery is in the first range and the charge of multiple second batteries is in the first range, a target battery is determined among the multiple second batteries whose charge is in the first range. The target battery is the second battery with the smallest charge difference from the first battery. If the charge of the first battery is less than or equal to that of the target battery, the first battery is controlled to discharge to the target battery to reduce the charge of the first battery to a first charge level.

6. The battery control method according to any one of claims 1 to 5, characterized by, The step of controlling the second battery to exchange energy with the first battery when the charge of the first battery is within the charge range of its voltage platform, thereby adjusting the charge of the first battery to be outside the charge range of its voltage platform, further includes: When the charge levels of both the first battery and the second battery are in the second range, the second battery is controlled to charge the first battery to increase the charge level of the first battery to the second charge level. After a third preset period of rest, the first battery is controlled to charge the second battery to increase the charge level of the second battery to the second charge level. The second interval is within the charge range of the voltage platform of the first battery, and the minimum value of the second interval is greater than the center value of the charge range of the voltage platform of the first battery; the second charge is greater than the maximum value of the second interval.

7. The battery control method according to claim 6, wherein After increasing the charge capacity of the second battery to the second charge capacity, the method further includes: After a fourth preset time period of rest, the second battery is controlled to charge the first battery again until the first battery and the second battery have the same charge.

8. The battery control method according to claim 6, wherein When the charge levels of both the first battery and the second battery are within a second range, controlling the second battery to charge the first battery to increase the charge level of the first battery to the second charge level includes: When the charge of the first battery is in the second range and the charge of multiple second batteries is in the second range, a target battery is determined among the multiple second batteries whose charge is in the second range. The target battery is the second battery with the smallest charge difference from the first battery. If the charge capacity of the first battery is greater than or equal to that of the target battery, the target battery is controlled to charge the first battery to increase the charge capacity of the first battery to the second charge capacity.

9. The battery control method according to any one of claims 1 to 5, wherein The first battery is a single battery cell. After obtaining the charge capacity of the first battery in the battery device, the method further includes: If the charge of the first battery is abnormal, the charge of the first battery is calibrated based on the charge of multiple individual cells in the battery pack to which the first battery belongs.

10. The battery control method according to claim 9, wherein Also includes: If the difference between the charge capacity of the first battery and the preset charge capacity is greater than the preset difference, it is determined that the charge capacity of the first battery is abnormal. The preset charge capacity is the average charge capacity of multiple battery cells in the battery pack containing the first battery.

11. The battery control method according to claim 9, wherein The step of calibrating the charge capacity of the first battery based on the charge capacity of multiple individual cells in the battery pack to which the first battery belongs includes: A reference battery is determined from among the multiple battery cells in the battery pack containing the first battery. The reference battery is a battery cell whose charge meets a preset condition. The first battery is controlled to exchange energy with the reference battery in order to calibrate the charge capacity of the first battery to a target charge capacity, wherein the target charge capacity is calibrated based on the charge capacity of the reference battery.

12. The battery control method of claim 11, wherein, The step of controlling the first battery to exchange energy with the reference battery to calibrate the charge capacity of the first battery to the target charge capacity includes: Control the first battery to exchange energy with the reference battery, and adjust the charge of the first battery to a preset charge outside the charge range of its voltage platform; The first battery and the reference battery are controlled to perform charge balance adjustment, and the charge of the first battery is updated. The difference between the preset charge and the charge of the first battery before adjustment is greater than the preset difference. After updating the charge of the first battery, the reference battery is controlled to perform reverse energy exchange with the first battery to adjust the charge of the first battery to the target charge, which is the average charge of the updated first battery and the reference battery.

13. A battery management system, characterized by, include: The acquisition module is used to acquire the charge capacity of the first battery in the battery device; A control module is configured to control a second battery to exchange energy with the first battery when the charge of the first battery is within the charge range of its voltage platform, thereby adjusting the charge of the first battery to a charge range outside its voltage platform. This includes: when the charge of the first battery is within a first range, controlling the first battery to discharge to the second battery to reduce the charge of the first battery to a first charge, where the first charge is less than the minimum value of the first range; the first range is within the charge range of the first battery's voltage platform, and the maximum value of the first range is less than the center value of the charge range of the first battery's voltage platform. The equalization module is used to control the charge balance adjustment between the first battery and the second battery.

14. A battery system comprising a battery device and a battery management system, characterized in that, The battery device includes a first battery and a second battery, the second battery being connected to the first battery; the battery management system is used to perform the steps of the battery control method as described in any one of claims 1 to 12.

15. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the battery control method as described in any one of claims 1 to 12.

16. A readable storage medium, the readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the battery control method as described in any one of claims 1 to 12.

17. A computer program product comprising a computer program, characterized in that, When the computer program is run, the battery control method as described in any one of claims 1 to 12 is executed.

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