Battery power balance method, device and electronic equipment

Abstract

The application discloses a battery power equalization method and device and electronic equipment. The method comprises the following steps: dividing a plurality of single batteries included in a target battery pack into a plurality of groups; determining a total power of each group corresponding to the plurality of groups, and a single battery power of the single batteries included in each group; determining an average power between groups of the plurality of groups based on the total power of each group corresponding to the plurality of groups, and the single battery power of the single batteries included in each group, and determining an average power within each group corresponding to the plurality of groups; and performing power equalization among the plurality of groups based on the average power between groups, and performing power equalization in the corresponding group based on the average power within each group corresponding to the plurality of groups. The application solves the technical problem of low efficiency of transferring the power of the single batteries due to long transfer time in the related art.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically, to a battery power equalization method, apparatus, and electronic device. Background Technology

[0002] New energy batteries are widely used in electric vehicles. During the charging and discharging process of electric vehicles, differences in the manufacturing processes of individual cells within a new energy battery pack result in variations in the charge capacity of these individual cells. To balance these differences, it is necessary to perform charge equalization on multiple individual cells. However, related technologies suffer from low efficiency in transferring charge between individual cells due to the long transfer time involved in this process.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This invention provides a battery power equalization method, apparatus, and electronic device to at least solve the technical problem in the related art where the long transfer time when transferring the power of multiple batteries leads to low efficiency in transferring the power of a single battery.

[0005] According to one aspect of the present invention, a battery power balancing method is provided, comprising: dividing a plurality of individual cells in a target battery pack into a plurality of groups; determining the total power of each group and the individual cell power of each individual cell in each group; determining the inter-group average power and the individual cell power of each individual cell in each group based on the total power of each group, and determining the intra-group average power of each group; performing power balancing between the plurality of groups based on the inter-group average power, and performing power balancing within each group based on the intra-group average power of each group.

[0006] Optionally, the step of balancing the power among the multiple groups based on the inter-group average power and balancing the power within each group based on the intra-group average power of each of the multiple groups includes: determining the group power difference between the target extreme value group power and the inter-group average power, and determining the target extreme value single battery power included in each of the multiple groups, and the single battery power difference between the target extreme value single battery power and the corresponding intra-group average power; determining a first energy release group with a corresponding group power difference greater than a first threshold, and a first energy storage group with a corresponding group power difference less than a second threshold, and determining, from the multiple extreme batteries included in each of the multiple groups, a first energy release battery with a corresponding single battery power difference greater than a corresponding third threshold, and a first energy storage group with a corresponding extreme value single battery power difference less than a corresponding third threshold. The first energy storage battery with a fourth threshold; sequentially sending a first switch control command to a first switch connected to the first energy release group, and a second switch control command to a second switch connected to the first energy storage group, to perform power balancing among the multiple groups; and sequentially sending a third switch control command to a third switch connected to the first energy release battery, and a fourth switch control command to a fourth switch connected to the first energy storage battery, to perform power balancing within the corresponding group, wherein the first switch connects the first energy release group and the first energy storage and release element, the second switch connects the first energy storage group and the first energy storage and release element, the third switch connects the first energy release battery and the second energy storage and release element, and the fourth switch connects the first energy storage battery and the second energy storage and release element.

[0007] Optionally, before determining the difference between the target extreme value group electricity and the inter-group average electricity, the method further includes: when the target extreme value group electricity includes maximum value group electricity and minimum value group electricity, and the number of maximum value group electricity and the number of minimum value group electricity are multiple, determining a first target extreme value group electricity from multiple maximum value group electricity and determining a second target extreme value group electricity from multiple minimum value group electricity; and determining the first target extreme value group electricity and the second target extreme value group electricity as the target extreme value group electricity.

[0008] Optionally, the step of sequentially sending a first switch control command to a first switch connected to the first energy release group, and a second switch control command to a second switch connected to the first energy storage group, and sequentially sending a third switch control command to a third switch connected to the first energy release battery, and a fourth switch control command to a fourth switch connected to the first energy storage battery, includes: determining a first energy release duration corresponding to the first energy release group, a first energy storage duration corresponding to the first energy storage group, a second energy release duration corresponding to the first energy release battery, and a second energy storage duration corresponding to the first energy storage battery; sequentially sending the first switch control command to the first switch, and the second switch control command to the second switch, and sequentially sending the third switch control command to the third switch, and the fourth switch control command to the fourth switch, wherein the first switch control command carries the first energy release duration, the second switch control command carries the first energy storage duration, the third switch control command carries the second energy release duration, and the fourth switch control command carries the second energy storage duration.

[0009] Optionally, the step of sequentially sending the first switch control command to the first switch, and the second switch control command to the second switch, and sequentially sending the third switch control command to the third switch, and the fourth switch control command to the fourth switch, includes: sending the first switch control command to the first switch, and sending the third switch control command to the third switch; after the first energy release duration, sending the second switch control command to the second switch, and after the second energy release duration, sending the fourth switch control command to the fourth switch.

[0010] Optionally, determining the total battery power of the multiple groups and the battery power of each individual battery in the multiple groups includes: receiving an adjustment start command sent by a timed power supply element when the multiple groups are in a power-off state; and determining the total battery power of the multiple groups and the battery power of each individual battery in the multiple groups in response to the adjustment start command.

[0011] Optionally, after determining the total battery capacity of each of the multiple groups and the battery capacity of each individual cell in each of the multiple groups, the method further includes: determining, from the multiple groups, a second energy release group whose total battery capacity is greater than a first threshold and a second energy storage group whose total battery capacity is less than a second threshold; and determining, from the multiple groups, a second energy release battery whose individual cell capacity is greater than a corresponding third threshold and a second energy storage battery whose individual cell capacity is less than a corresponding fourth threshold; arranging the second energy release group and the second energy storage group in a predetermined order to obtain a group set sequence; and arranging the corresponding second energy release battery and the corresponding second energy storage battery in the predetermined order to obtain a multiple battery set sequence; and sequentially sending corresponding switch control commands to the switches connected to the corresponding groups according to the group set sequence to perform battery equalization among the multiple groups, and sequentially sending corresponding switch control commands to the switches connected to the corresponding batteries according to the multiple battery set sequence to perform battery equalization within the corresponding groups.

[0012] According to one aspect of the present invention, a battery power balancing device is provided, comprising: a division module for dividing a plurality of individual cells in a target battery pack into a plurality of groups; a first determining module for determining the total power of each group and the individual cell power of each individual cell in each group; a second determining module for determining the inter-group average power of the plurality of groups and the individual cell power of each individual cell in each group based on the total power of each group, and determining the intra-group average power of each group; and a balancing module for balancing power among the plurality of groups based on the inter-group average power and balancing power within each group based on the intra-group average power of each group.

[0013] According to one aspect of the present invention, an electronic device is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the battery discharge duration determination method described in any of the preceding claims.

[0014] According to one aspect of the present invention, a computer-readable storage medium is provided, comprising: when instructions in the computer-readable storage medium are executed by a processor of an electronic device, enabling the electronic device to perform the battery discharge duration determination method described above.

[0015] In this embodiment of the invention, the target battery pack, comprising multiple individual cells, is divided into multiple groups. The total capacity of each group and the individual cell capacity of each group are then determined. Next, based on the total capacity of each group, the average capacity between groups and the individual cell capacity of each group are determined. The average capacity within each group is also determined. Finally, based on the average capacity between groups and the average capacity within each group, the goal of balancing capacity is achieved both between and within the groups. The target battery pack and its constituent individual cells are divided according to a rule based on similar energy levels, resulting in multiple groups and individual cells within each group. Based on this energy level division rule, the energy utilization and efficiency of the target battery pack can be improved to a certain extent. This reduces the energy differences between different individual cells within multiple groups, thereby improving energy leveling efficiency. Furthermore, by simultaneously performing energy leveling between and within groups, the energy leveling speed between and within multiple groups can be shortened to a certain extent, improving energy leveling efficiency. This solves the technical problem in related technologies where the long transfer time during the transfer of energy from multiple batteries leads to low efficiency in transferring energy from individual cells. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a flowchart of a battery power balancing method according to an embodiment of the present invention;

[0018] Figure 2 is a diagram of a distributed balancing structure of a power battery including a battery pack, provided by an optional embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the group and the upper equalizer provided in an optional embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure for energy charging and discharging between the subgroup and the upper equalizer provided in an optional embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of multiple individual cells and the underlying equalizer within a group provided by an optional embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of a structure provided by an optional embodiment of the present invention, in which multiple individual batteries in a group and an underlying equalizer perform charging and discharging.

[0023] Figure 7 This is a schematic diagram of another structure provided by an optional embodiment of the present invention, showing how multiple individual cells within a group and an underlying equalizer perform charging and discharging.

[0024] Figure 8 This is a structural block diagram of a battery power equalization device according to an embodiment of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] Example 1

[0028] According to an embodiment of the present invention, an embodiment of a battery power equalization method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0029] Figure 1 This is a flowchart of a battery power balancing method according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0030] Step S102: Divide the multiple individual cells of the target battery pack into multiple groups;

[0031] In step S102 of this application, the target battery pack is a collection of a series of individual batteries. The individual batteries can be various types of batteries such as lithium-ion batteries, lead-acid batteries, and lithium cobalt oxide batteries. They can be used in electric vehicles, home energy storage systems, industrial applications, as well as ships and aircraft. There are no limitations on this, and the settings can be customized according to the actual application and scenario.

[0032] The above-mentioned target battery packs can be divided into the following categories:

[0033] 1) The battery pack can be divided according to voltage, specifically based on the voltage of individual cells. For example, the target battery pack can be divided into several groups with similar voltages, where the voltage difference between individual cells within each group is minimal. This voltage division rule can, to a certain extent, ensure that the individual cells in the target battery pack maintain a relatively balanced charge during charging and discharging, preventing some cells from being overcharged or undercharged. This reduces safety hazards caused by uneven charging and discharging, such as overcharging and over-discharging.

[0034] 2) The battery pack can be divided according to its capacity, i.e., based on the capacity of individual cells. For example, the target battery pack can be divided into several groups with similar capacities, minimizing the difference in capacity between individual cells within each group. Based on this capacity division rule, the energy utilization rate and operating efficiency of the target battery pack can be improved to some extent, reducing the difference in capacity between different individual cells within multiple groups and improving the efficiency of capacity balancing.

[0035] 3) The battery pack can be divided according to internal resistance rules, that is, according to the internal resistance of individual cells. For example, the target battery pack can be divided into multiple groups with similar internal resistance, so that the difference in internal resistance of individual cells within multiple groups is small. Based on the internal resistance division rules, the temperature difference of the target battery pack can be reduced to a certain extent, reducing the risk of runaway caused by temperature imbalance and improving the safety of the target battery pack.

[0036] 4) It can be divided according to location, that is, multiple adjacent individual cells can be grouped together, which can speed up the time for power equalization.

[0037] Based on the above classification rules, we choose to classify the target battery pack according to its capacity, dividing it into multiple groups. Each group contains multiple individual cells. In this case, cells with similar capacities can be grouped into sets of three. For example, assuming the target battery pack in the above method is a lithium battery pack, and it is implemented in an electric vehicle application scenario, the lithium battery pack includes multiple groups, and each group contains three individual lithium battery cells.

[0038] Step S104: Determine the total battery capacity of each of the multiple groups and the battery capacity of each individual cell in each of the multiple groups.

[0039] In step S104 provided in this application, the total power of the above-mentioned groups represents the sum of the power of the individual cells of the multiple groups.

[0040] It should be noted that, based on the division results of the lithium battery packs in the previous steps, the total capacity of the lithium battery packs in each subgroup is determined, as well as the capacity of the lithium batteries included in each subgroup.

[0041] For example, following the division method described above, suppose the target battery pack is divided into three groups: A, B, and C, with each group corresponding to three individual cells. If the capacities of the three individual cells in group A are a1, a2, and a3, then the total capacity of group A is the sum of the capacities of the three individual cells, i.e., (a1 + a2 + a3). If the capacities of the three individual cells in group B are b1, b2, and b3, then the total capacity of group B is the sum of the capacities of the three individual cells, i.e., (b1 + b2 + b3). If the capacities of the three individual cells in group C are c1, c2, and c3, then the total capacity of group C is the sum of the capacities of the three individual cells, i.e., (c1 + c2 + c3).

[0042] Step S106: Based on the total battery power of the multiple groups, determine the average battery power between the multiple groups and the battery power of the individual cells included in the multiple groups, and determine the average battery power within the multiple groups.

[0043] In step S106 provided in this application, the above-mentioned average power consumption between groups represents the average value of the total power consumption of the multiple groups, that is, the average power consumption between groups.

[0044] For example, based on the previous implementation method, the total battery capacity of the three groups A, B, and C in the target battery pack has been determined to be (a1+a2+a3), (b1+b2+b3), and (c1+c2+c3). At this time, the average battery capacity between the three groups A, B, and C can be determined to be {(a1+a2+a3)+(b1+b2+b3)+(c1+c2+c3)} / 3.

[0045] The above average battery capacity within a group represents the average battery capacity of the individual cells included in each of the multiple groups, i.e., the average battery capacity within a group.

[0046] For example, based on the previous implementation method, the capacities of the three individual cells in the three groups A, B, and C of the target battery pack have been determined as (a1, a2, a3), (b1, b2, b3), and (c1, c2, c3), respectively. At this time, the average capacities within the three groups A, B, and C can be determined as (a1+a2+a3) / 3, (b1+b2+b3) / 3, and (c1+c2+c3) / 3, respectively.

[0047] Step S108: Balance the power consumption among multiple groups based on the average power consumption between groups, and balance the power consumption within the corresponding groups based on the average power consumption within each group.

[0048] In step S108 provided in this application, the above-mentioned power balancing is divided into two cases: inter-group power balancing and intra-group power balancing. Inter-group balancing is the power balancing between multiple groups, while intra-group power balancing is the power balancing between individual cells included in multiple groups.

[0049] For example, based on the previous implementation method, the average charge between the three groups A, B, and C of the target battery pack has been determined to be {(a1+a2+a3)+(b1+b2+b3)+(c1+c2+c3)} / 3. Based on the average charge between the groups, the charge balance between the three groups A, B, and C can be achieved.

[0050] For example, based on the previous implementation method, the average charge within the three groups A, B, and C of the target battery pack has been determined to be (a1+a2+a3) / 3, (b1+b2+b3) / 3, and (c1+c2+c3) / 3, respectively. Based on the average charge within the groups, the charge within the three groups A, B, and C can be balanced.

[0051] It should be noted that the above-mentioned two types of power balancing are inter-group power balancing and intra-group power balancing. Inter-group power balancing, i.e., intra-group power balancing, can achieve power balancing between multiple groups, as well as power balancing between individual cells within multiple groups. Through synchronous power balancing between and within groups, the power balancing speed between multiple groups and within the corresponding groups can be shortened to a certain extent, thereby improving the efficiency of power balancing.

[0052] Through the steps S102-S108 described above, the target battery pack, comprising multiple individual cells, is first divided into multiple groups. Then, the total capacity of each group and the individual cell capacity of each group are determined. Next, based on the total capacity of each group, the average capacity between groups and the individual cell capacity of each group are determined, as well as the average capacity within each group. Finally, based on the average capacity between groups and the average capacity within groups, the goal of balancing the capacity between and within each group is achieved. The target battery pack and its constituent individual cells are divided according to a rule based on similar energy levels, resulting in multiple groups and individual cells within each group. Based on this energy level division rule, the energy utilization and efficiency of the target battery pack can be improved to a certain extent. This reduces the energy differences between different individual cells within multiple groups, thereby improving energy leveling efficiency. Furthermore, by simultaneously performing energy leveling between and within groups, the energy leveling time between and within multiple groups can be shortened to a certain extent, improving energy leveling efficiency. This solves the technical problem in related technologies where the long transfer time during the transfer of energy from multiple batteries leads to low efficiency in transferring energy from individual cells.

[0053] As an optional embodiment, power balancing is performed among multiple groups based on the average power between groups, and power balancing is performed within each group based on the average power within each group. This includes: determining the group power difference between the target extreme value group power and the average power between groups; determining the target extreme value individual battery power included in each group, and the difference between the individual battery power and the average power within the corresponding group; identifying a first energy release group with a group power difference greater than a first threshold, and a first energy storage group with a group power difference less than a second threshold; and identifying, from the multiple extreme value batteries included in each group, a first energy release battery with a corresponding individual battery power difference greater than a corresponding third threshold, and a first energy storage group with a corresponding... The first energy storage battery has an extreme value single cell capacity that is less than the corresponding fourth threshold. A first switch control command is sequentially sent to a first switch connected to a first energy release group, and a second switch control command is sent to a second switch connected to the first energy storage group to balance the capacity among multiple groups. A third switch control command is sequentially sent to a third switch connected to the first energy release battery, and a fourth switch control command is sent to a fourth switch connected to the first energy storage battery to balance the capacity within the corresponding group. The first switch connects the first energy release group to the first energy storage / discharge element, the second switch connects the first energy storage group to the first energy storage / discharge element, the third switch connects the first energy release battery to the second energy storage / discharge element, and the fourth switch connects the first energy storage battery to the second energy storage / discharge element.

[0054] In this embodiment, based on the aforementioned implementation method, after determining the average inter-group power and the average intra-group power of multiple groups, it is also necessary to determine the difference between the target extreme value group power and the inter-group average power, and the difference between the target extreme value individual battery power and the corresponding intra-group average power of each of the multiple groups. By setting a first threshold and a second threshold, groups with a power difference greater than the first threshold (i.e., the first energy release group) and groups with a single battery power difference less than the second threshold (i.e., the first energy storage group) can be identified. The first and second thresholds can be the same or values ​​within a predetermined range relative to the inter-group average power. Furthermore, by setting a third and fourth threshold, single batteries with a power difference greater than the corresponding third threshold (i.e., the first energy release battery) and single batteries with a power difference less than the corresponding extreme value individual battery (i.e., the first energy storage battery) can be identified. The third and fourth thresholds can be the same or values ​​within a predetermined range relative to the corresponding intra-group average power.

[0055] It should be noted that, after determining the first energy storage group and the first energy release group, a first switch control command is sequentially sent to the first switch connected to the first energy release group, connecting the first energy release group to the first energy storage / release element and transferring the power of the first energy release group to the first energy storage / release element. Then, a second switch control command is sent to the second switch connected to the first energy storage group, connecting the first energy storage group to the first energy storage element and transferring the power stored in the first energy storage / release element to the first energy storage group. This transfers power from groups with higher power levels to groups with lower power levels, achieving power balance between groups. This command-based approach allows for rapid switch response, thus accelerating the implementation process of the method described in this application.

[0056] It should also be noted that, after determining the first energy-discharging battery and the first energy-storing battery, a third switch control command can be sequentially sent to the third switch connected to the first energy-discharging battery, connecting the first energy-discharging battery to the second energy-storing element and transferring the charge from the first energy-discharging battery to the second energy-storing element. Then, a fourth switch control command is sent to the fourth switch connected to the first energy-storing battery, connecting the first energy-storing battery to the second energy-storing element and transferring the charge stored in the second energy-storing element to the first energy-storing battery. This transfer of charge from batteries with higher charge levels to batteries with lower charge levels achieves a balance of charge within the battery group. This command-based approach allows for rapid switch response, thereby accelerating the implementation process of the method described in this application.

[0057] As an optional embodiment, before determining the difference between the target extreme value group electricity and the average electricity between groups, the method further includes: when the target extreme value group electricity includes maximum value group electricity and minimum value group electricity, and there are multiple maximum value group electricity and multiple minimum value group electricity, determining the first target extreme value group electricity from the multiple maximum value group electricity and determining the second target extreme value group electricity from the multiple minimum value group electricity; and determining the first target extreme value group electricity and the second target extreme value group electricity as the target extreme value group electricity.

[0058] In this embodiment, according to the method described above, the target extreme value group electricity includes a maximum value group electricity and a minimum value group electricity. When there are multiple maximum value group electricitys, the distances between each of the multiple maximum value group electricitys and the corresponding first energy storage element in the circuit can be determined. Then, based on the shortest distance to the first energy storage element, the first target extreme value group electricity is determined from the multiple maximum value group electricitys. The same principle applies when there are multiple minimum value group electricitys, and will not be elaborated here.

[0059] Taking an instantaneous energy storage and discharge element as an example, such elements require immediate charging and discharging. Therefore, charging is achieved by connecting one battery group to it, and discharging by connecting other battery groups to it, thus achieving the effect of energy transfer. Therefore, it is necessary to identify a battery group with a higher energy level and a battery group with a lower energy level, and then transfer energy between the two groups. In this embodiment, a battery group with a maximum energy level and a battery group with a minimum energy level are identified. Transferring energy between these groups first balances the most unbalanced parts of the power battery groups. Furthermore, by selecting the extreme values, it is relatively easy to determine the battery group that needs energy transfer, demonstrating a certain degree of efficiency and convenience.

[0060] It should be noted that, similar to this optional implementation, when the target extreme value of a single battery cell includes a maximum value of a single battery cell and a minimum value of a single battery cell, wherein there are multiple maximum values ​​of single battery cells and multiple minimum values ​​of single battery cells, the first target extreme value of a single battery cell is determined from the multiple maximum values ​​of single battery cells, and the second target extreme value of a single battery cell is determined from the multiple minimum values ​​of single battery cells. Finally, the first target extreme value of a single battery cell and the second target extreme value of a single battery cell are determined as the target extreme value of a single battery cell.

[0061] Similarly, based on the method described above, the target extreme value of a single battery cell includes both maximum and minimum single battery cell capacities. When there are multiple maximum single battery cell capacities, the distances between each maximum single battery cell capacity and its corresponding second energy storage / discharge element in the circuit are determined. Then, based on the shortest distance to the second energy storage / discharge element, the second target extreme value of a single battery cell capacities is determined from among the multiple maximum single battery cell capacities. The same principle applies when there are multiple minimum single battery cell capacities, and will not be elaborated upon here.

[0062] Taking an instantaneous energy storage and discharge element as an example, such elements require immediate charging and discharging. Therefore, connecting one battery to it charges it, and connecting other batteries to it discharges it, achieving the effect of energy transfer. Thus, it is necessary to identify a battery with a higher energy level and a battery with a lower energy level, and transfer energy between them. In this embodiment, a battery with a maximum single-cell energy level and a battery with a minimum single-cell energy level are identified. Transferring energy between them balances the most unbalanced parts of the power battery. Furthermore, by selecting the extreme values, the battery to be transferred can be easily determined, demonstrating a certain degree of efficiency and convenience.

[0063] As an optional embodiment, a first switch control command is sequentially sent to a first switch connected to a first energy release group, and a second switch control command is sequentially sent to a second switch connected to a first energy storage group. A third switch control command is sequentially sent to a third switch connected to a first energy release battery, and a fourth switch control command is sequentially sent to a fourth switch connected to a first energy storage battery. This includes: determining a first energy release duration corresponding to the first energy release group, a first energy storage duration corresponding to the first energy storage group, a second energy release duration corresponding to the first energy release battery, and a second energy storage duration corresponding to the first energy storage battery; sequentially sending a first switch control command to the first switch, and a second switch control command to the second switch, and sequentially sending a third switch control command to the third switch, and a fourth switch control command to the fourth switch, wherein the first switch control command carries the first energy release duration, the second switch control command carries the first energy storage duration, the third switch control command carries the second energy release duration, and the fourth switch control command carries the second energy storage duration.

[0064] In this embodiment, the power balancing activation process is determined according to the above implementation method. It should be noted that the power balancing activation process includes two cases: one is the power balancing activation process between multiple groups in the above method, and the other is the power balancing activation process within a corresponding group in the above method.

[0065] It should be noted that before starting the above two power balancing processes, the balancing time corresponding to inter-group power balancing and intra-group power balancing must be determined. The balancing time is the duration of turning on the corresponding switch, which includes the energy release time and the energy storage time. The following will explain the different cases.

[0066] Regarding the equalization process between battery groups, taking the energy storage and discharge element as an instantaneous energy storage and discharge element as an example, using the methods described above, a group with a higher energy level and a group with a lower energy level are identified. The first energy discharge duration corresponding to the first energy discharge group and the first energy storage duration corresponding to the first energy storage group are determined. After determining the first energy discharge duration and the first energy storage duration included in the equalization duration, a first switch control command carrying the first energy discharge duration is sent to the first switch. The first switch is closed, initiating the energy transfer process between the group with the higher energy level and the group with the lower energy level. The first switch is closed for the first energy discharge duration, charging the first energy storage and discharge element. Then, a second switch control command carrying the first energy storage duration is sent to the second switch, closing the first switch, initiating the energy storage process between the groups. The second switch is closed for the first energy storage duration, and the first energy storage and discharge element charges the group with the lower energy level. In this embodiment, the equalization duration is determined, and the energy transfer between multiple groups in the power battery can be completed within the effective equalization duration, exhibiting a certain degree of efficiency and targeting, and avoiding overcharging or over-discharging.

[0067] Regarding the balancing process within a battery group, taking the energy storage and discharge element as an example, the above-mentioned method identifies a battery with a higher charge and a battery with a lower charge. The second discharge duration corresponding to the first discharging battery and the second storage duration corresponding to the first storage battery are determined. After determining the second discharge duration and the second storage duration included in the balancing time, a third switch control command carrying the second discharge duration is sent to the third switch. The third switch is closed, initiating the transfer of energy between the higher and lower charge batteries. The second discharge duration of the third switch is closed, charging the second energy storage and discharge element. Then, a fourth switch control command carrying the second storage duration is sent to the fourth switch, closing the fourth switch, initiating the energy storage process within the battery group. The second storage duration of the fourth switch is closed, and the second energy storage and discharge element discharges to the lower charge battery. In this embodiment, the balancing time is determined, enabling the transfer of energy between multiple individual batteries within multiple groups of the power battery to be completed within an effective balancing time. This demonstrates high efficiency and specificity, avoiding overcharging or over-discharging.

[0068] As an optional embodiment, a first switch control command is sequentially sent to the first switch, and a second switch control command is sequentially sent to the second switch, and a third switch control command is sequentially sent to the third switch, and a fourth switch control command is sequentially sent to the fourth switch, including: sending the first switch control command to the first switch and sending the third switch control command to the third switch; after a first discharge duration, sending the second switch control command to the second switch, and after a second discharge duration, sending the fourth switch control command to the fourth switch.

[0069] In this embodiment, a third switch control command carrying a second discharge duration is sent to the third switch, closing the third switch and initiating the power transfer process between the battery with higher charge and the battery with lower charge. The third switch is then closed for the second discharge duration, charging the second energy storage element. After the second discharge duration, a fourth switch control command carrying a second energy storage duration is sent to the fourth switch, closing the fourth switch and initiating the energy storage process within the group. The fourth switch is then closed for the second energy storage duration, and the second energy storage element discharges to the battery with lower charge. This embodiment determines the order in which commands are sent, avoiding the problem of accidental opening or closing of switches due to command delays or transmission failures, which could affect the implementation process of the method and ensure the orderly implementation of the method.

[0070] As an optional embodiment, determining the total battery power of the multiple groups and the individual battery power of the multiple groups includes: receiving an adjustment start command sent by a timed power supply element when the multiple groups are in a power-off state; and in response to the adjustment start command, determining the total battery power of the multiple groups and the individual battery power of the multiple groups.

[0071] This embodiment describes the process of determining the total battery capacity of each of the multiple groups and the individual battery capacity of each group. When multiple groups are in a power-off state, in response to an adjustment start command sent by a timed power supply element, the total battery capacity of each group and the individual battery capacity of each group are determined. By configuring the timed power supply element, the total battery capacity of each group and the individual battery capacity of each group can be detected when the battery is power-off, thus covering battery balance detection under power-off conditions. This provides comprehensiveness and avoids battery imbalance problems caused by leakage or other phenomena during power-off conditions.

[0072] As an optional embodiment, after determining the total energy capacity of the multiple groups and the individual battery capacity of each group, the method further includes: identifying a second energy release group whose total energy capacity is greater than a first threshold and a second energy storage group whose total energy capacity is less than a second threshold from the multiple groups; identifying a second energy release battery whose individual battery capacity is greater than a corresponding third threshold and a second energy storage battery whose individual battery capacity is less than a corresponding fourth threshold from the multiple groups; arranging the second energy release group and the second energy storage group in a predetermined order to obtain a group set sequence; and arranging the corresponding second energy release battery and the corresponding second energy storage battery in a predetermined order to obtain a multiple battery set sequence; and sequentially sending corresponding switch control commands to the switches connected to the corresponding groups according to the group set sequence to perform energy balancing among the multiple groups, and sequentially sending corresponding switch control commands to the switches connected to the corresponding batteries according to the multiple battery set sequence to perform energy balancing within the corresponding groups.

[0073] In this embodiment, after determining the total power of multiple groups and the individual battery power of each group, based on the aforementioned implementation method, a second energy release group, a second energy storage group, a second energy release battery, and a second energy storage battery can be determined sequentially by setting a first threshold, a second threshold, a third threshold, and a fourth threshold. The second energy release group and the second energy storage group are then arranged in a predetermined order to obtain a group set sequence. The corresponding second energy release batteries and corresponding second energy storage batteries are then arranged in a predetermined order to obtain multiple battery set sequences. According to the aforementioned group set sequence, corresponding switch control commands are sequentially sent to the switches connected to the corresponding groups to perform power balancing among the multiple groups. Similarly, according to the aforementioned multiple battery set sequences, corresponding switch control commands are sequentially sent to the switches connected to the corresponding batteries to perform power balancing within the corresponding groups.

[0074] It should be noted that when arranging the second energy dissipation group and the second energy storage group in a predetermined order, the predetermined order can be one group that needs to discharge, one group that needs to charge, and so on. That is, the predetermined order can alternate between groups that need to discharge and groups that need to charge, so that when the energy storage and dissipation elements are instantaneous, an effective balance can be achieved through immediate charging and discharging. This avoids the problem of method execution chaos caused by arranging two groups that need to discharge, where the energy from the group in the first position is discharged to the group in the second position. This ensures that the method provided in this application can be performed in an orderly manner.

[0075] Moreover, by determining the set, there is no need to repeatedly obtain the individual battery power and group power. By determining the power once, the power balance can be achieved, saving computing resources.

[0076] Based on the above embodiments and optional embodiments, an optional implementation method is provided, which is described in detail below.

[0077] In related technologies, there are technical problems such as wasted energy in individual battery cells and low efficiency in transferring energy in individual battery cells due to long transfer times. For example, in one type of related technology, when energy-consuming components such as resistors are used for energy transfer, these components dissipate excess energy from high-charge cells based on low-charge cells, resulting in wasted battery energy. Another type involves using balancing strategies to transfer energy in individual battery cells during the energy transfer process, but without considering the energy transfer path, long-distance balancing occurs, leading to excessively long balancing times and low efficiency in balancing individual battery cells.

[0078] Therefore, an optional embodiment of the present invention provides a battery power balancing method. Figure 2 This is a diagram of a distributed balancing structure for power batteries, including a battery bank, provided by an optional embodiment of the present invention. Figure 2 As shown, the distributed equalization structure of the power battery includes: multiple groups, an upper-level equalizer (same as the first energy storage and dissipation element mentioned above) connected to each of the multiple groups, and a lower-level equalizer (same as the second energy storage and dissipation element mentioned above) connected to each of the multiple groups, a drive circuit, an equalization master controller, a single-cell voltage and temperature acquisition device, a drive circuit, a slave control chip, a master control chip, a clock chip, a power management chip, a total voltage acquisition module, and an insulation monitoring module. The optional embodiments of this application are described in detail below.

[0079] (I) An introduction to the components included in the distributed equalization structure of power batteries:

[0080] Multiple groups: also known as battery modules, these consist of multiple individual battery cells. The series-connected battery cells are grouped, with m × n cells divided into m groups, each containing n individual cells. When the cells are not evenly distributed, the last group can have fewer than n cells. The battery management system's data acquisition module and related chips calculate the state of individual cells and groups. Through the equalization main controller and drive circuit, energy balancing is achieved both within and between groups, ultimately resulting in consistent energy balance across all individual cells within the series-connected battery pack.

[0081] Slave module: Manages the individual cell voltage and temperature acquisition unit and the equalization main controller. It is mainly responsible for acquiring and calculating the individual cell voltage and temperature, equalizing the battery, and diagnosing corresponding faults. It also transmits the acquired information to the main control module through the control bus CAN or serial peripheral interface SPI communication.

[0082] Slave chip: mainly responsible for communicating with the master control module, uploading the processed cell voltage and temperature information collected by the cell acquisition module to the master control chip, and receiving instructions from the master control chip to control the equalization of the cell acquisition module to turn on or off; Cell voltage and temperature acquisition module is responsible for battery cell voltage and temperature acquisition, calculation and fault diagnosis, and specific information is transmitted to slave chip via SPI or daisy chain.

[0083] The main control module is responsible for receiving individual cell temperature and voltage information from the slave control modules. It also performs functions such as battery mode status control, battery information SOX calculation, charge and discharge management, thermal management, fault diagnosis, equalization management, relay control, current and total voltage acquisition, etc.

[0084] Main control chip: The core control unit of the main control module and implements all its functions.

[0085] The power management chip (SBC) communicates with the master control chip via the serial peripheral interface SPI. It is responsible for power supply management, wake-up identification, and watchdog function management of all modules in the master control module and slave control module, as well as the chip itself.

[0086] The clock chip (RTC) is responsible for calendar timekeeping and timing functions. It communicates with the main control chip via a two-wire synchronous serial bus (I2C). When the current time reaches the timing interval configured by the main control chip, it outputs a low-level interrupt signal to trigger the SBC to wake up all modules, completing the timing wake-up function. The RTC is powered by a 3.3V power supply during normal power-on of the battery management system (BMS). The external battery power supply is 12V. When the BMS is in a power-down sleep state, the external battery power supply is converted to 3.3V through a current-limiting resistor and a Zener diode to continuously power the RTC, ensuring normal operation of the RTC in the BMS sleep state. Before power-down sleep, the BMS configures the timing wake-up time as T via the main control chip. The RTC receives the timing wake-up time from the main control chip and compares the current real-time time with the timing time. When the real-time time reaches the timing time, the external battery power supply outputs a 12V high level to power the main control chip and other peripheral chips, completing the timing wake-up process.

[0087] The total voltage acquisition module is responsible for acquiring the total voltage of the battery's positive and negative terminals, as well as the current of the shunt.

[0088] The insulation detection module is responsible for collecting and calculating the insulation resistance of the high-voltage positive and negative terminals of the battery.

[0089] (II) The steps for achieving battery power balance between and within battery groups using a distributed equalization structure for power batteries are introduced:

[0090] S1. Divide the nine individual cells of the lithium battery pack, namely a1, a2, a3, b1, b2, b3, c1, c2, and c3, into three groups: A, B, and C.

[0091] It should be noted that before determining the individual cells included in groups A, B, and C, they need to be grouped according to a predetermined method, that is, grouped into groups of three individual cells each. This results in the individual cells corresponding to groups A, B, and C as (a1, a2, a3), (b1, b2, b3), and (c1, c2, c3), respectively. Figure 2 As shown, Figure 2 The leftmost group consists of three subgroups: A, B, and C. Each subgroup contains three individual battery cells.

[0092] S2. Based on the above example, the total battery capacity of groups A, B, and C is 210%, 225%, and 255%, respectively, and the battery capacity of individual cells in groups A, B, and C is (60%, 70%, 80%), (65%, 75%, 85%), and (75%, 85%, 95%), respectively.

[0093] S3. Based on the total electricity consumption of groups A, B, and C in the above example, the average electricity consumption between groups A, B, and C is determined to be 230%, and the average electricity consumption within groups A, B, and C is 70%, 75%, and 85%, respectively.

[0094] It should be noted that, based on the above average power between groups and the corresponding average power within groups, the difference between the average power between groups and the target extreme value group power, as well as the difference between the average power within groups and the target extreme value single cell power, are determined respectively.

[0095] Methods for determining the aforementioned charge difference include the extreme value method, the average method, and the adjacent ratio method. In the example above, considering the operating characteristics of lithium batteries, the relative range method was chosen to determine the charge difference.

[0096] Taking the calculation of the difference in electricity consumption between groups as an example, the calculation formula is as follows:

[0097] ；

[0098] ；

[0099] ；

[0100] In the above formula: For the power of the i-th group among multiple groups, SOC K This represents the average electricity consumption across multiple groups; in the example above, K is 1, 2, 3, and n is 3. and , which are the maximum group energy and the minimum group energy, respectively. β+ is the difference between the maximum group energy and the average group energy, and β- is the difference between the minimum group energy and the average group energy.

[0101] Similarly, taking the corresponding intra-group electricity difference as an example, the above calculation formula can still be used. However, in this case, the meaning of the letters in the formula will change accordingly, such as: For the charge of the i-th individual cell in multiple groups, SOC K This represents the average charge of n individual cells in the Kth group of a series-connected network; in the example above, K is 1, 2, or 3, and n is 3. and , which are the maximum and minimum single-cell battery capacities, respectively. β+ is the difference between the maximum single-cell battery capacities and the corresponding average battery capacities within the group, and β- is the difference between the minimum single-cell battery capacities and the corresponding average battery capacities within the group.

[0102] S4. Based on the above example, the average charge between groups A, B, and C is balanced among the three groups A, B, and C, and the average charge within each group is balanced within the corresponding group based on the average charge of each of the individual cells (a1, a2, a3), (b1, b2, b3), and (c1, c2, c3) included in the three groups A, B, and C.

[0103] The following sections explain the inter-group power balance and intra-group power balance in different scenarios.

[0104] Figure 3 This is a schematic diagram of the structure of the group and the upper equalizer provided in an optional embodiment of the present invention. Figure 4 This is a schematic diagram of the energy charging and discharging structure between the subgroup and the upper equalizer provided in an optional embodiment of the present invention, as shown below. Figure 3 , 4 As shown, the case where the upper equalizer is an inductor will be used as an example for explanation:

[0105] The process of balancing the power among the three groups A, B, and C is as follows: Figure 4 As shown:

[0106] The inter-group energy balancing process includes two stages: inductor charging and discharging. Assuming group A has the highest energy level and group C has the lowest, once the balancing activation condition is met, under the control of the drive circuit, during the charging stage, switches S11 and S22 are turned on. Group A charges the inductor through the switches, with current flowing in the direction of the solid arrow, converting electrical energy into stored magnetic energy. During the discharging stage, the control signal drives switches S14 and S23 to turn on, and the inductor charges group C through the switch circuit, with current flowing in the direction of the dashed arrow, converting electromagnetic energy into electrical energy. This completes one charge-discharge cycle for the first energy storage element. Under the control of the control circuit, this process is repeated until the balancing deactivation condition is met, and then the next pair of groups begins the balancing process. This continues until balancing is achieved between the groups.

[0107] Figure 5 This is a schematic diagram of the structure of multiple individual cells and the underlying equalizer within a group provided by an optional embodiment of the present invention. Figure 6 This is a schematic diagram of a structure provided by an optional embodiment of the present invention, showing how multiple individual cells within a group and an underlying equalizer perform charging and discharging. Figure 7 This is a schematic diagram of another structure provided by an optional embodiment of the present invention, showing the charging and discharging of multiple individual cells within a group and an underlying equalizer, as shown below. Figure 5 , 6 As shown in Figure 7, the following explanation is based on the case where the underlying equalizer is a bidirectional forward DC-DC converter:

[0108] First, let's introduce DC-DC converters, such as... Figure 5 As shown, U1 is the low-voltage side, and U2 is the high-voltage side. This topology mainly includes a transformer T; two sampling resistors R1 and R2; two filter capacitors C1 and C2; a clamping capacitor C3; a filter inductor L; and four switching transistors Q1-Q4. The circuit can operate in two modes: power is transferred from the low-voltage side U1 to the high-voltage side U2, and power is transferred from the high-voltage side U2 to the low-voltage side U1.

[0109] The process of balancing the power within the corresponding group, such as Figure 6 As shown:

[0110] When electrical charge is transferred from the high-voltage side to the low-voltage side, the circuit operates similarly to a traditional forward converter, involving four steps to transfer the charge within the group. These four steps are as follows: Figure 6 As shown in part (1), the drive signals for the four switching transistors are as follows: Figure 6 (2) The conduction timing can be divided into 4 stages.

[0111] When power is transferred from the low-voltage side to the high-voltage side, the circuit operates similarly to a traditional boost circuit. The difference lies in the addition of a transformer between the actual high-voltage side and the high-voltage output of the boost circuit to isolate the high and low voltage sides. In this case, the transfer of power within the group occurs through two steps, as follows: Figure 7 (1) As shown in the part, the signals of the four switching transistors are as follows Figure 7 As shown in (2), the conduction timing can be divided into two stages.

[0112] In the example above, the balancing topology among the three groups A, B, and C consists of a power inductor and several switching transistors, as shown in the diagram. Figure 7 As shown, each group is first treated as a "large battery," thus dividing the overall series-connected battery pack into several "large batteries," effectively reducing the number of batteries connected in series. Then, a single-inductor balancing method is used to balance the charge between any two unbalanced groups. By coordinating with the corresponding intra-group balancing, this overcomes the limitation of the single-inductor balancing method being unsuitable for balancing multiple series-connected batteries.

[0113] The above optional implementation methods can achieve at least the following beneficial effects:

[0114] (1) Since the lithium battery pack is divided according to the power division rule, the three groups A, B and C are obtained and the individual cells (a1, a2, a3), (b1, b2, b3) and (c1, c2, c3) are included respectively. Based on the power division rule, the power utilization rate and working efficiency of the target battery pack can be improved to a certain extent, the power difference between different individual cells included in the three groups is reduced, and the power balance efficiency is improved.

[0115] (2) During the process of balancing the power between groups A, B, and C, and balancing the power within each group of individual cells, the first energy storage and discharge element and the second energy storage and discharge element are used to achieve the balancing between groups and the balancing within each group, respectively. The first energy storage and discharge element and the second energy storage and discharge element are both charge-and-discharge, which can improve the charging and discharging efficiency of the battery to a certain extent.

[0116] (3) Since the inter-group power balancing between the three groups A, B, and C, as well as the intra-group power balancing of the individual cells included in the three groups A, B, and C, are all carried out synchronously, the corresponding inter-group power balancing and intra-group power balancing can be completed in a shorter time. Based on synchronous balancing, the power balancing time can be shortened to a certain extent and the power transfer efficiency can be improved.

[0117] (4) Since the power balance between the three groups A, B and C is achieved through power transfer, and the power balance within the three groups A, B and C is achieved through power transfer between individual batteries, no power is consumed, ensuring that the power is fully utilized and not wasted.

[0118] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0119] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0120] Example 2

[0121] According to embodiments of the present invention, an apparatus for implementing the above-described battery charge balancing method is also provided. Figure 8 This is a structural block diagram of a battery power equalization device according to an embodiment of the present invention, such as... Figure 8 As shown, the device includes: the aforementioned division module 802, the first determination module 804, the second determination module 806, and the equalization module 808. The device will be described in detail below.

[0122] A partitioning module 802 is used to divide the target battery pack into multiple groups of individual cells; a first determining module 804, connected to the partitioning module 802, is used to determine the total capacity of each group and the individual cell capacity of each group; a second determining module 806, connected to the first determining module 804, is used to determine the average capacity between groups and the average capacity of each group based on the total capacity of each group, and to determine the average capacity within each group based on the individual cell capacity of each group; a balancing module 808, connected to the second determining module 806, is used to balance the capacity between the groups based on the average capacity between groups, and to balance the capacity within each group based on the average capacity within each group.

[0123] It should be noted that the above-mentioned division module 802, first determination module 804, second determination module 806, and equalization module 808 correspond to steps S102 to S108 in the implementation of the battery power equalization method. The multiple modules and the corresponding steps implement the same instances and application scenarios, but are not limited to the content disclosed in the above embodiment 1.

[0124] Example 3

[0125] According to another aspect of the present invention, an electronic device is also provided, comprising: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute instructions to implement the battery power balancing method described above.

[0126] Example 4

[0127] According to another aspect of the present invention, a computer-readable storage medium is also provided, which, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform any of the above-described battery power balancing methods.

[0128] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0129] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0130] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0131] 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 units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0132] Furthermore, the functional units in the various embodiments of the present invention 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.

[0133] 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, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0134] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery power equalization method, characterized in that, include: The target battery pack is divided into multiple groups of individual cells. Determine the total battery capacity of each of the multiple groups, and the battery capacity of each individual cell in each of the multiple groups; Based on the total battery power of each of the multiple groups, the average battery power between the multiple groups is determined, and the battery power of each individual battery included in each of the multiple groups is determined, and the average battery power within each of the multiple groups is determined. Power balancing is performed among the multiple groups based on the average power consumption between the groups, and power balancing is performed within the corresponding groups based on the average power consumption within each of the multiple groups. The step of balancing the power among multiple groups based on the average power between groups, and balancing the power within each group based on the average power within each group, includes: determining the power difference between the target extreme value group power and the average power between groups, and determining the power difference between the target extreme value single battery power included in each of the multiple groups and the average power within each group; identifying a first energy release group with a power difference greater than a first threshold and a first energy storage group with a power difference less than a second threshold, and identifying, from the multiple extreme batteries included in each of the multiple groups, a first energy release battery with a single battery power difference greater than a corresponding third threshold and a first energy storage battery with a single battery power difference less than a corresponding fourth threshold; determining a first energy release duration corresponding to the first energy release group and a first energy storage duration corresponding to the first energy storage group. The system includes a storage duration, a second discharge duration corresponding to the first discharge battery, and a second storage duration corresponding to the first storage battery. It sequentially sends a first switch control command to the first switch, a second switch control command to the second switch, a third switch control command to the third switch, and a fourth switch control command to the fourth switch. The first switch control command carries the first discharge duration, the second switch control command carries the first storage duration, the third switch control command carries the second discharge duration, and the fourth switch control command carries the second storage duration. The first switch connects the first discharge group to the first energy storage / discharge element, the second switch connects the first energy storage group to the first energy storage / discharge element, the third switch connects the first discharge battery to the second energy storage / discharge element, and the fourth switch connects the first energy storage battery to the second energy storage / discharge element.

2. The method according to claim 1, characterized in that, Before determining the difference between the target extreme value group electricity and the inter-group average electricity, the method further includes: When the target extreme value group electricity includes the maximum value group electricity and the minimum value group electricity, and there are multiple maximum value group electricity and multiple minimum value group electricity, the first target extreme value group electricity is determined from the multiple maximum value group electricity, and the second target extreme value group electricity is determined from the multiple minimum value group electricity. The first target extreme value group electricity and the second target extreme value group electricity are determined as the target extreme value group electricity.

3. The method according to claim 1, characterized in that, The step of sequentially sending the first switch control command to the first switch, and the second switch control command to the second switch, and sequentially sending the third switch control command to the third switch, and the fourth switch control command to the fourth switch, includes: Send the first switch control command to the first switch, and send the third switch control command to the third switch; After the first energy release duration, a second switch control command is sent to the second switch, and after the second energy release duration, a fourth switch control command is sent to the fourth switch.

4. The method according to claim 1, characterized in that, Determining the total battery capacity of each of the multiple groups and the battery capacity of each individual cell in each of the multiple groups includes: While the multiple groups are in a power-off state, they receive adjustment start commands sent by the timed power supply element; In response to the adjustment start command, the total battery capacity of each of the plurality of groups is determined, as well as the battery capacity of each individual cell included in each of the plurality of groups.

5. The method according to any one of claims 1 to 4, characterized in that, After determining the total battery capacity of each of the multiple groups and the battery capacity of each individual cell included in each of the multiple groups, the method further includes: From the plurality of groups, a second energy release group whose total energy capacity is greater than the first threshold and a second energy storage group whose total energy capacity is less than the second threshold are identified. From the plurality of groups, a second energy release battery whose individual battery capacity is greater than the corresponding third threshold and a second energy storage battery whose individual battery capacity is less than the corresponding fourth threshold are identified respectively. The second energy release group and the second energy storage group are arranged in a predetermined order to obtain a group set sequence, and the corresponding second energy release battery and the corresponding second energy storage battery are arranged in the predetermined order to obtain multiple battery set sequences. According to the group set sequence, the corresponding switch control command is sent sequentially to the switch connected to the corresponding group to perform power balancing among the multiple groups, and according to the multiple battery set sequence, the corresponding switch control command is sent sequentially to the switch connected to the corresponding battery to perform power balancing within the corresponding group.

6. A battery power equalization device, characterized in that, include: The partitioning module is used to divide the target battery pack into multiple groups of individual cells. The first determining module is used to determine the total power of the multiple groups and the power of the individual batteries in each of the multiple groups. The second determining module is used to determine the average power between multiple groups and the power of individual batteries included in each of the multiple groups based on the total power of the groups respectively, and to determine the average power within each group respectively. The balancing module is used to balance the power among the multiple groups based on the average power between the groups, and to balance the power within the corresponding groups based on the average power within each of the multiple groups. The equalization module is further configured to determine the difference between the target extreme value group's energy level and the average energy level between groups, and to determine the difference between the target extreme value individual battery energy level included in each of the multiple groups and the average energy level within the corresponding group; to determine a first energy release group with a group energy level difference greater than a first threshold and a first energy storage group with a group energy level difference less than a second threshold, and to determine, from the multiple extreme value batteries included in each of the multiple groups, a first energy release battery with a corresponding individual battery energy level difference greater than a corresponding third threshold and a first energy storage battery with a corresponding extreme value individual battery energy level less than a corresponding fourth threshold; to determine a first energy release duration corresponding to the first energy release group, a first energy storage duration corresponding to the first energy storage group, a second energy release duration corresponding to the first energy release battery, and a second energy storage duration corresponding to the first energy release battery. The energy storage battery corresponds to a second energy storage duration; a first switch control command is sequentially sent to the first switch, and a second switch control command is sequentially sent to the second switch, and a third switch control command is sequentially sent to the third switch, and a fourth switch control command is sequentially sent to the fourth switch, wherein the first switch control command carries the first energy release duration, the second switch control command carries the first energy storage duration, the third switch control command carries the second energy release duration, and the fourth switch control command carries the second energy storage duration; the first switch connects the first energy release group and the first energy storage and release element, the second switch connects the first energy storage group and the first energy storage and release element, the third switch connects the first energy release battery and the second energy storage and release element, and the fourth switch connects the first energy storage battery and the second energy storage and release element.

7. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the battery power balancing method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, When the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to perform the battery power balancing method as described in any one of claims 1 to 5.

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