A method, device, medium and equipment for preventing power battery from being balanced by mistake

Abstract

The application provides a method, device, medium and equipment for preventing power battery from being balanced by mistake, the method comprising: determining a first single battery cell satisfying a balance opening condition for the first time in a current charging process; screening a second single battery cell not satisfying the balance opening condition from the first single battery cell according to a voltage curve of the first single battery cell at a current charging end time; and balancing the first single battery cell except the second single battery cell at a next charging start time of the current charging, so that the single battery cell satisfying the balance opening condition for the first time in a previous charging process but not satisfying the balance opening condition at the charging end time is eliminated before the current charging, the probability of the single battery cell being balanced by mistake is reduced, the consistency of the single battery cells is improved, and the release power and energy of the battery pack are improved.

Description

Technical Field

[0001] This application relates to the field of battery pack balancing technology, and in particular to a method, apparatus, medium and equipment for preventing power batteries from being incorrectly balanced. Background Technology

[0002] The power battery of an electric vehicle is composed of several individual cells connected in series. When there is a large voltage difference between these individual cells, that is, when the consistency of the individual cells is not good, it will affect the power and energy released by the battery pack.

[0003] Currently, to maintain the consistency of individual cells, a battery pack balancing strategy is generally used to balance each individual cell. However, in existing technologies, conventional balancing algorithms are poorly designed and may misbalance individual cells, failing to ensure battery consistency. Summary of the Invention

[0004] To address the problems existing in the prior art, embodiments of the present invention provide a method, apparatus, medium, and device for preventing incorrect balancing of power batteries, so as to solve or partially solve the technical problem in the prior art that incorrect balancing of individual cells is easily caused when balancing power batteries, resulting in the inability to ensure battery consistency and affecting battery performance.

[0005] A first aspect of the present invention provides a method for preventing incorrect balancing of a power battery, the method comprising:

[0006] During the current charging process, identify the first individual cell that meets the conditions for equalization activation for the first time.

[0007] At the end of the current charging, based on the voltage curve of the first individual cell, a second individual cell that does not meet the equalization start-up condition is selected from the first individual cell.

[0008] At the start of the next charge cycle, the first cell (excluding the second cell) is balanced.

[0009] In the above scheme, the first single cell that initially meets the equalization start-up conditions includes:

[0010] During the current charging process, obtain the voltage of all effective individual cells in the battery pack and obtain the minimum effective individual cell voltage;

[0011] If each effective cell voltage is traversed, and the effective cell voltage is greater than a preset first voltage threshold and the voltage difference between the effective cell voltage and the minimum effective cell voltage is greater than a second voltage threshold, then the cell corresponding to the effective cell voltage is determined as the first cell cell that first meets the equalization start-up condition.

[0012] In the above scheme, obtaining the effective single-cell voltage of all individual cells in the battery pack includes:

[0013] Obtain the voltage value of each individual battery cell;

[0014] For any single battery cell, if the voltage value of the single battery cell is within the effective voltage range, then the voltage value of the single battery cell is determined as the effective single cell voltage.

[0015] In the above scheme, the current charging end time is the time when the cell voltage reaches the preset cutoff voltage.

[0016] In the above scheme, the step of selecting a second cell that does not meet the equalization start-up condition from the first cell based on the voltage curve of the first cell includes:

[0017] For the first individual cell, obtain the individual cell voltage of the first individual cell. If it is determined that the individual cell voltage of the first individual cell is less than or equal to a first voltage threshold, or...

[0018] If the voltage difference between the single cell voltage of the first cell and the minimum effective single cell voltage is less than or equal to the second voltage threshold, then the first cell is determined not to meet the equalization turn-on condition.

[0019] The first cell that does not meet the conditions for balanced activation is identified as the second cell.

[0020] In the above scheme, the balancing of the first single cell (excluding the second single cell) includes:

[0021] Obtain the location number of the first individual cell (excluding the second individual cell) in the battery pack;

[0022] Based on the balancing strategy, the corresponding first single cell is balanced according to the location number.

[0023] A second aspect of the present invention provides a device for preventing erroneous equalization of a power battery, the device comprising:

[0024] The determining unit is used to determine, during the current charging process, the first individual cell that first meets the equalization start-up conditions;

[0025] The filtering unit is used to filter out a second cell that does not meet the equalization start-up condition from the first cell based on the voltage curve of the first cell at the end of the current charging.

[0026] The balancing unit is used to balance the first single cell (excluding the second single cell) at the start of the next charging cycle.

[0027] In the above scheme, the determining unit is used for:

[0028] During the current charging process, obtain the voltage of all effective individual cells in the battery pack and obtain the minimum effective individual cell voltage;

[0029] The effective single-cell voltage of each cell is iterated. If the effective single-cell voltage of the cell is greater than a preset first voltage threshold and the voltage difference between the effective single-cell voltage and the minimum effective single-cell voltage is greater than a second voltage threshold, then the cell is determined as the first single-cell cell that meets the equalization turn-on condition.

[0030] In the above scheme, the determining unit is specifically used for:

[0031] Obtain the voltage value of each individual battery cell;

[0032] For any single battery cell, if the voltage value of the single battery cell is within the effective voltage range, then the voltage value of the single battery cell is determined as the effective single cell voltage.

[0033] In the above scheme, the current charging end time is the time when the cell voltage reaches the preset cutoff voltage.

[0034] In the above scheme, the filtering unit is specifically used for:

[0035] For the first individual cell, obtain the individual cell voltage of the first individual cell. If it is determined that the individual cell voltage of the first individual cell is less than or equal to a first voltage threshold, or...

[0036] If the voltage difference between the single cell voltage of the first cell and the minimum effective single cell voltage is less than or equal to the second voltage threshold, then the first cell is determined not to meet the equalization turn-on condition.

[0037] The first cell that does not meet the conditions for balanced activation is identified as the second cell.

[0038] In the above scheme, the equalization unit is used for:

[0039] Obtain the location number of the first individual cell (excluding the second individual cell) in the battery pack;

[0040] Based on the balancing strategy, the corresponding first single cell is balanced according to the location number.

[0041] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method described in any of the first aspects.

[0042] A fourth aspect of the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the steps of the method described in any of the first aspects.

[0043] This invention provides a method, apparatus, medium, and device for preventing incorrect equalization of power batteries. The method includes: during the current charging process, identifying a first individual cell that first meets the equalization activation conditions; at the end of the current charging process, selecting a second individual cell from the first individual cells that does not meet the equalization activation conditions based on the voltage curve of the first individual cell; at the start of the next charging process, equalizing the first individual cells excluding the second individual cell; thus, before the current equalization begins, cells that first met the equalization activation conditions during the previous charging process but did not meet the equalization activation conditions at the end of the charging process are eliminated, reducing the probability of incorrect equalization of cells, improving the consistency of each cell, and thereby improving the power output and energy release of the battery pack. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0045] In the attached diagram:

[0046] Figure 1 A schematic diagram of voltage curves for different battery cells according to an embodiment of the present invention is shown;

[0047] Figure 2 A schematic flowchart of a method for preventing incorrect equalization of power batteries according to an embodiment of the present invention is shown.

[0048] Figure 3 A schematic diagram of a device for preventing incorrect equalization of power batteries according to an embodiment of the present invention is shown;

[0049] Figure 4 A schematic diagram of a computer device structure according to an embodiment of the present invention is shown;

[0050] Figure 5 A schematic diagram of a computer-readable storage medium structure according to an embodiment of the present invention is shown. Detailed Implementation

[0051] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0052] To better understand the technical solution of this application, we will first introduce the conventional equalization algorithm for battery packs, such as... Figure 1 As shown, the voltage characteristic curves of three battery cells in this embodiment of the invention are illustrated, namely Vr, Vf, and V0. The equalization activation condition of the conventional equalization algorithm is that during the charging process, when the voltage value of the battery cell is greater than the voltage threshold Vs, equalization is activated for that battery cell.

[0053] For example, continue to refer to Figure 1 For example, at time t1 (the moment when a certain cell to be balanced first meets the equalization start condition), Vr and Vf are both greater than Vs, and the difference between Vr, Vf and V0 is greater than or equal to the preset voltage threshold. At this time, it is determined that Vr and Vf both meet the equalization start condition. Then, the conventional equalization scheme will directly determine the cells corresponding to Vr and Vf as cells to be balanced.

[0054] Although Vr and Vf meet the equalization activation conditions at time t1 during charging, at time t2 (when the cell voltage reaches the cutoff voltage Vd), only Vr is greater than Vs and the difference between Vr and V0 is greater than or equal to the preset voltage threshold. Vf and V0 have already converged, and the voltage difference between them is less than the preset voltage threshold, indicating that Vf does not need equalization. Therefore, from the overall process, only Vr needs to be equalized. However, if a conventional equalization algorithm is used, the cells corresponding to Vr and Vf would be directly identified as cells to be equalized, meaning the cell corresponding to Vf would be the one incorrectly equalized.

[0055] Therefore, in order to prevent the cells from being incorrectly balanced, embodiments of the present invention provide a method for preventing incorrect balancing of power batteries, such as... Figure 2 As shown, the method mainly includes the following steps:

[0056] S210, during the current charging process, identifies the first single cell that meets the equalization start-up conditions for the first time;

[0057] To reduce false equalization of battery cells, this embodiment identifies cells that initially meet the equalization conditions but fail to do so at the end of each charging cycle. For the current charge, cells that do not meet the equalization activation conditions are selected and removed in the next charge cycle. Therefore, it is crucial to identify the first individual cell that initially meets the equalization activation conditions during the current charge cycle. This facilitates the subsequent selection of cells that do not meet the equalization activation conditions from this first individual cell at the end of the current charge cycle, preventing false equalization.

[0058] In one implementation, determining the first individual cell that first meets the equalization start-up conditions includes:

[0059] During the current charging process, obtain the voltage of all effective individual cells in the battery pack and obtain the minimum effective individual cell voltage;

[0060] By iterating through each effective cell voltage, if the effective cell voltage is greater than a preset first voltage threshold and the voltage difference between the effective cell voltage and the minimum effective cell voltage is greater than a second voltage threshold, then the cell corresponding to the effective cell voltage is determined as the first cell cell that first meets the equalization start-up condition.

[0061] In one implementation, obtaining the effective cell voltages of all individual cells in the battery pack includes:

[0062] Obtain the voltage value of each individual battery cell;

[0063] For any single cell, if the voltage value of the single cell is within the effective voltage range, then the voltage value of the single cell is determined as the effective single cell voltage.

[0064] Specifically, the battery pack contains many cells, each with a unique location number within the pack. During the current charging process, each cell in the battery pack will have a corresponding voltage; however, some voltages are valid while others are invalid. This embodiment requires obtaining the voltages of all valid individual cells in the battery pack.

[0065] In this embodiment, the effective voltage range is [2000, 4000] mV. For any cell, the voltage that meets the effective voltage range is called the effective cell voltage; the voltage that exceeds the effective voltage range is called the ineffective cell voltage. For example, if the voltage of a cell is 3000 mV, it means that the voltage of the cell is an effective cell voltage; if the voltage of a cell is 1500 mV or 4500 mV, it means that the voltage of the cell is an ineffective cell voltage.

[0066] After obtaining all effective cell voltages, the minimum effective cell voltage is determined from all effective cell voltages and denoted as Vmin. Iterating through all effective cell voltages, for any effective cell voltage Vi, if it is determined that Vi > Vthreshold and Vi - Vmin > ΔVthreshold, it means that cell numbered i meets the equalization turn-on condition.

[0067] Wherein, Vthreshold is the first voltage threshold, and ΔVthreshold is the second voltage threshold. The first and second voltage thresholds are preset according to the voltage characteristics of the battery cell and are not restricted here.

[0068] For example, assuming the voltage range of the battery cell is 2 to 4.4V, then the first voltage threshold can be 3.5 to 3.7V; the second voltage threshold can be 0.02 to 0.04V, preferably 0.03V.

[0069] Assume that the effective single-cell voltage Vi of a certain cell i is 3.7V, the first voltage threshold is 3.5V, the minimum effective single-cell voltage is 3.6V, and the second voltage threshold is 0.02V. Then, since Vi > 3.5V and Vi - Vmin > 0.02V, it means that cell i is the first single-cell cell that meets the equalization turn-on condition.

[0070] In this way, all the first individual cells that meet the equalization activation conditions for the first time can be identified during the current charging process. Simultaneously, the location number of each first individual cell within the battery pack also needs to be determined. To reduce the probability of false equalization, the first individual cells will not participate in the equalization process temporarily.

[0071] S211, at the end of the current charging, a second cell that does not meet the equalization start-up condition is selected from the first cell based on the voltage curve of the first cell.

[0072] In actual charging, some cells may meet the equalization activation conditions during charging, but may converge with other cells at the end of charging, no longer meeting the equalization activation conditions. For such cells, equalization is unnecessary. Therefore, this embodiment also needs to filter out second cells that do not meet the equalization activation conditions from the first cell at the end of the current charging cycle, based on the voltage curve of the first cell, to avoid incorrect equalization of the second cell.

[0073] In one implementation, selecting a second cell that does not meet the equalization start-up condition from the first cell based on the voltage curve of the first cell includes:

[0074] For the first individual battery cell, obtain the individual cell voltage of the first individual battery cell. If it is determined that the individual cell voltage of the first individual battery cell is less than or equal to a first voltage threshold; or,

[0075] If the voltage difference between the voltage of the first cell and the minimum effective cell is less than or equal to the second voltage threshold, then the first cell is determined not to meet the equalization turn-on condition.

[0076] The first cell that does not meet the conditions for balanced activation is identified as the second cell, and the location number of the second cell is obtained.

[0077] For example, suppose the first single cell includes five cells A, B, and C, the first voltage threshold is 3.5V, the minimum effective single cell voltage is 3.6V, and the second voltage threshold is 0.03V.

[0078] At the end of charging, cell A has a voltage of 3.4V, cell B has a voltage of 3.61V, and cell C has a voltage of 3.65V. For cell A, its voltage is lower than the first voltage threshold; and the difference between cell A's voltage and the minimum effective single-cell voltage is -0.2V, which is lower than the second voltage threshold. Therefore, cell A does not meet the equalization activation condition at the end of charging.

[0079] Regarding cell B, although its voltage is greater than the first voltage threshold of 3.5V, the difference between its voltage and the minimum effective single-cell voltage is 0.01V, which is less than the second voltage threshold of 0.03V. Therefore, cell B does not meet the equalization activation condition at the end of charging. In this case, cells A and B can be identified as the second single-cell battery.

[0080] For cell C, if its voltage is greater than the first voltage threshold and the difference between its voltage and the minimum effective single-cell voltage is 0.15V, which is greater than the second voltage threshold, it means that cell C still meets the equalization activation condition at the end of charging. In this case, cell C will not be identified as the second single-cell cell.

[0081] This allows for the selection of cells that initially meet the equalization activation conditions during charging (with higher cell voltage), but whose voltages converge at the end of charging (no longer meeting the equalization activation conditions), thus reducing the probability of false equalization.

[0082] S212, at the start of the next charging cycle, equalize the first single cell (excluding the second single cell).

[0083] Since the second cell no longer meets the equalization activation conditions at the end of the current charging cycle, this embodiment will perform equalization on the first cell (excluding the second cell) at the start of the next charging cycle.

[0084] In one implementation, equalization is performed on the first individual cell (excluding the second individual cell), including:

[0085] Obtain the location number of the first individual cell (excluding the second individual cell) in the battery pack;

[0086] Based on the balancing strategy, the first single cell is balanced according to its location number.

[0087] Specifically, during long-term use, inevitable changes occur within the battery pack, leading to variations in the capacity or state of charge (SOC) of each cell. Following the barrel principle, the amount of water a horizontally placed barrel can hold is determined by its shortest stave; similarly, the capacity of a battery pack is determined by the same principle. Therefore, it is necessary to balance the battery pack to ensure that the voltage of each cell is more consistent.

[0088] Battery balancing technology mainly includes two types: passive balancing and active balancing. Passive balancing, also known as energy dissipation balancing, works by connecting a resistor in parallel with each cell. When a cell is prematurely fully charged and needs to continue charging other cells, the resistor is connected to discharge the excess energy from that cell. The advantages of passive balancing are its simple structure, low layout cost, and simple hardware implementation.

[0089] Active balancing, also known as non-dissipative balancing, works by creating an energy transfer path between each battery cell, moving energy from higher-energy cells to lower-energy cells. The advantage of active balancing circuits is lower energy loss, but they also have higher circuit costs, more complex topologies, and larger capacitors and inductors, leading to greater space requirements.

[0090] It should be noted that during the current and next charging processes, it is also necessary to obtain the voltage characteristic curve of the first single cell (excluding the second single cell) and re-select the cells that do not meet the equalization start-up conditions and their corresponding position numbers using the same screening method as the current one.

[0091] In each subsequent charging process, the above steps S210 to 212 are continuously executed in a loop until all the battery cells no longer need to participate in balancing.

[0092] This embodiment records the charge-discharge curve characteristics of each individual cell during each charge-discharge cycle, filtering out cells that initially meet the equalization activation condition during the current charge but fail to meet it at the end of the charge (the end of the charge). In other words, during the next charge cycle to initiate equalization, cells that did not meet the equalization activation condition recorded in the previous charge cycle are removed, reducing the probability of incorrect cell equalization and thus better maintaining battery consistency.

[0093] Based on the same inventive concept as in the foregoing embodiments, this embodiment also provides a device for preventing incorrect equalization of power batteries, such as... Figure 3 As shown, the device includes:

[0094] The determining unit 31 is used to determine the first single cell that first meets the equalization start-up conditions during the current charging process;

[0095] The screening unit 32 is used to screen out a second cell that does not meet the equalization start-up condition from the first cell at the end of the current charging time, based on the voltage curve of the first cell.

[0096] The balancing unit 33 is used to balance the first single cell (excluding the second single cell) at the start time of the next charging cycle.

[0097] In one embodiment, the determining unit 31 is specifically used for:

[0098] During the current charging process, obtain the voltage of all effective individual cells in the battery pack and obtain the minimum effective individual cell voltage;

[0099] The effective single-cell voltage of each cell is iterated. If the effective single-cell voltage of the cell is greater than a preset first voltage threshold and the voltage difference between the effective single-cell voltage and the minimum effective single-cell voltage is greater than a second voltage threshold, then the cell is determined as the first single-cell cell that meets the equalization turn-on condition.

[0100] Since the apparatus described in the embodiments of this invention is used to implement the method for preventing power battery misbalancing according to the embodiments of this invention, those skilled in the art can understand the specific structure and variations of the apparatus based on the method described in the embodiments of this invention, and therefore will not be described in detail here. All apparatuses used in the methods of the embodiments of this invention fall within the scope of protection of this invention.

[0101] Based on the same inventive concept, this embodiment provides a computer device 400, such as... Figure 4 As shown, the system includes a memory 410, a processor 420, and a computer program 411 stored in the memory 410 and executable on the processor 420. When the processor 420 executes the computer program 411, it performs the following steps:

[0102] During the current charging process, identify the first individual cell that meets the conditions for equalization activation for the first time.

[0103] At the end of the current charging, based on the voltage curve of the first individual cell, a second individual cell that does not meet the equalization start-up condition is selected from the first individual cell.

[0104] At the start of the next charge cycle, the first cell (excluding the second cell) is balanced.

[0105] Based on the same inventive concept, this embodiment provides a computer-readable storage medium 500, such as... Figure 5 As shown, a computer program 511 is stored thereon, which, when executed by a processor, performs the following steps:

[0106] During the current charging process, identify the first individual cell that meets the conditions for equalization activation for the first time.

[0107] At the end of the current charging, based on the voltage curve of the first individual cell, a second individual cell that does not meet the equalization start-up condition is selected from the first individual cell.

[0108] At the start of the next charge cycle, the first cell (excluding the second cell) is balanced.

[0109] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0110] This invention provides a method, apparatus, medium, and device for preventing incorrect equalization of power batteries. The method includes: during the current charging process, identifying a first individual cell that first meets the equalization activation conditions; at the end of the current charging process, selecting a second individual cell from the first individual cells that does not meet the equalization activation conditions based on the voltage curve of the first individual cell; at the start of the next charging process, equalizing the first individual cells excluding the second individual cell; thus, before the current equalization begins, cells that first met the equalization activation conditions during the previous charging process but did not meet the equalization activation conditions at the end of the charging process are eliminated, reducing the probability of incorrect equalization of cells, improving the consistency of each cell, and thereby improving the power output and energy release of the battery pack.

[0111] The algorithms and displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, this invention is not directed to any particular programming language. It should be understood that the contents of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0112] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0113] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0114] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0115] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0116] The various component embodiments of the present invention can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components of the gateway, proxy server, or system according to embodiments of the present invention. The present invention can also be implemented as a device or apparatus program (e.g., a computer program and computer program product) for performing some or all of the methods described herein. Such programs implementing the present invention can be stored on a computer-readable medium or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0117] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0118] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0119] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preventing incorrect equalization of power batteries, characterized in that, The method includes: During the current charging process, identify the first individual cell that meets the conditions for equalization activation for the first time. At the end of the current charging, based on the voltage curve of the first individual cell, a second individual cell that does not meet the equalization start-up condition is selected from the first individual cell. At the start of the next charging cycle, the first individual cell (excluding the second individual cell) is balanced; wherein, The determination of the first single cell that first meets the equalization start-up conditions includes: During the current charging process, obtain the voltage of all effective individual cells in the battery pack and obtain the minimum effective individual cell voltage; If each effective cell voltage is traversed, and if the effective cell voltage is greater than a preset first voltage threshold and the voltage difference between the effective cell voltage and the minimum effective cell voltage is greater than a second voltage threshold, then the cell corresponding to the effective cell voltage is determined as the first cell cell that first meets the equalization start-up condition. The step of selecting a second cell that does not meet the equalization start-up condition from the first cell based on the voltage curve of the first cell includes: For the first individual cell, obtain the individual cell voltage of the first individual cell. If it is determined that the individual cell voltage of the first individual cell is less than or equal to a first voltage threshold, or... If the voltage difference between the first cell voltage and the minimum effective cell voltage is less than or equal to the second voltage threshold, then the first cell does not meet the equalization turn-on condition. The first cell that does not meet the conditions for balanced activation is identified as the second cell.

2. The method as described in claim 1, characterized in that, The process of obtaining the effective cell voltages in the battery pack includes: Obtain the voltage value of each individual battery cell; For any single battery cell, if the voltage value of the single battery cell is within the effective voltage range, then the voltage value of the single battery cell is determined as the effective single cell voltage.

3. The method as described in claim 1, characterized in that, The current charging end time is the time when the cell voltage reaches the preset cutoff voltage.

4. The method as described in claim 1, characterized in that, The balancing of the first single cell (excluding the second single cell) includes: Obtain the location number of the first individual cell (excluding the second individual cell) in the battery pack; Based on the balancing strategy, the corresponding first single cell is balanced according to the location number.

5. A device for preventing incorrect equalization of power batteries, characterized in that, The device includes: The determining unit is used to determine, during the current charging process, the first individual cell that first meets the equalization start-up conditions; The filtering unit is used to filter out a second cell that does not meet the equalization start-up condition from the first cell based on the voltage curve of the first cell at the end of the current charging. The balancing unit is used to balance the first individual battery cell (excluding the second individual cell) at the start of the next charging cycle; wherein, The determining unit is used for: During the current charging process, obtain the voltage of all effective individual cells in the battery pack and obtain the minimum effective individual cell voltage; The effective single-cell voltage of each cell is iterated. If the effective single-cell voltage of the cell is greater than a preset first voltage threshold and the voltage difference between the effective single-cell voltage and the minimum effective single-cell voltage is greater than a second voltage threshold, then the cell corresponding to the effective single-cell voltage is determined as the first single-cell cell that first meets the equalization start-up condition. The step of selecting a second cell that does not meet the equalization start-up condition from the first cell based on the voltage curve of the first cell includes: For the first individual battery cell, obtain the individual cell voltage of the first individual battery cell. If it is determined that the individual cell voltage of the first individual battery cell is less than or equal to a first voltage threshold, or... If the voltage difference between the first cell voltage and the minimum effective cell voltage is less than or equal to the second voltage threshold, then the first cell does not meet the equalization turn-on condition. The first cell that does not meet the conditions for balanced activation is identified as the second cell.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 1-4.

7. A computer 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 program, it implements the steps of the method according to any one of claims 1-4.

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