Battery system fault handling methods, devices, computer equipment, and media

Abstract

This application discloses a battery system fault handling method, apparatus, computer equipment, storage medium, and computer program product. The entire solution further processes the battery system after short-circuit repair. Specifically, it first obtains the individual cell voltages and total voltage of the repaired battery system in a fully charged state. Based on the individual cell voltages and total voltage, it estimates the total number of remaining effective cells. Then, based on the remaining effective cell number and the original cell number, it processes the total energy of the repaired battery system. Throughout the process, the total energy is corrected based on the remaining effective cell number and the original cell number to avoid inaccurate total energy calculations caused by the reduction of effective cells in the battery system after fault repair, which would affect the normal use of the repaired battery system and support accurate energy management.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery system fault handling method, apparatus, computer equipment, storage medium, and program product. Background Technology

[0002] With the development of science and technology, battery systems are needed in more and more fields and scenarios to provide energy for loads so that they can work properly, such as the battery systems in electric vehicles.

[0003] After a certain period of use, battery systems may experience cell failures that render the entire system unusable. Traditionally, the problematic cells are repaired to enable the battery system to charge and discharge normally.

[0004] While the above method can restore a faulty battery system to normal charging and discharging, the repaired battery system cannot support accurate energy management. Summary of the Invention

[0005] In view of the above problems, this application provides a battery system fault handling method, apparatus, computer equipment, storage medium and program product to process the battery system after fault repair so that the battery system after fault repair can support accurate energy management.

[0006] In a first aspect, this application provides a battery system fault handling method, the method comprising:

[0007] Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair;

[0008] The total number of remaining effective cells in the battery system after fault repair is determined based on the individual cell voltage and the total voltage.

[0009] Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred.

[0010] In the technical solution of this application embodiment, further processing is performed on the battery system after the short-circuit bridging repair. Specifically, the individual cell voltages and total voltage of the battery system in a fully charged state are first obtained. The total number of remaining effective cells is estimated based on the individual cell voltages and total voltage. Then, the total energy of the battery system after the fault repair is processed based on the remaining effective cell number and the original cell number. Throughout the process, the total energy is corrected based on the remaining effective cell number and the original cell number to avoid inaccurate total energy calculations caused by the reduction of effective cells in the battery system after the short-circuit bridging repair, which could affect the normal use of the battery system after the fault repair and support accurate energy management.

[0011] In some embodiments, determining the total number of remaining effective cells in the battery system after fault repair, based on the individual cell voltage and the total voltage, includes:

[0012] Based on the individual cell voltage and the total voltage, obtain the number of remaining effective cells in series in the battery system after fault repair.

[0013] Obtain the ratio of the original total number of battery cells to the number of cells connected in series;

[0014] The comparison value is rounded to obtain the number of parallel connected effective cells remaining in the battery system after the fault is repaired;

[0015] Based on the number of series and parallel connections of the remaining effective cells, determine the total number of remaining effective cells in the battery system after fault repair.

[0016] In the technical solution of this application embodiment, the number of series and parallel connections of the remaining effective cells is first analyzed by the voltage of a single cell, and then the total number of remaining effective cells in the battery system after fault repair is determined based on the number of series and parallel connections. The whole process does not require manual counting and can efficiently and accurately obtain the total number of remaining effective cells.

[0017] In some embodiments, the number of series-connected remaining effective cells in the battery system after fault repair is obtained based on the individual cell voltage and the total voltage, including:

[0018] Generate a single cell voltage sequence based on the individual cell voltage;

[0019] Screen the maximum and minimum single-cell voltages in the single-cell voltage sequence;

[0020] If the difference between the maximum and minimum cell voltages is greater than a preset voltage difference threshold, the maximum and minimum cell voltages in the cell voltage sequence are removed to update the cell voltage sequence, and the process returns to the step of filtering the maximum and minimum cell voltages in the cell voltage sequence.

[0021] If the difference between the maximum and minimum single-cell voltages is not greater than a preset voltage difference threshold, then obtain the number N of historically removed single-cell cells.

[0022] Obtain the maximum single-cell voltage and the remaining total voltage in the latest single-cell voltage sequence;

[0023] The number of series connections of the remaining effective cells is obtained based on the number N of historically removed individual cells, the maximum individual cell voltage in the latest individual cell voltage sequence, and the remaining total voltage.

[0024] In the technical solution of this application embodiment, considering the differences in consistency between different individual cells in the battery system, in order to ensure that the ratio between the final total voltage and the median value of the individual cell voltage can more accurately represent the number of series connections, the voltage of each individual cell is screened, and the largest and smallest individual cell voltages with significant differences are removed, so that the voltage of each individual cell in the updated individual cell voltage sequence moves closer to the median value, and finally the accurate number of series connections of the remaining effective cells can be obtained.

[0025] In some embodiments, the number of series connections of the remaining valid cells is obtained based on the number N of historically removed individual cells, the maximum individual cell voltage in the latest individual cell voltage sequence, and the remaining total voltage, including:

[0026] Obtain the voltage ratio of the maximum single cell voltage to the remaining total voltage in the latest single cell voltage sequence; round the voltage ratio to obtain the integer value.

[0027] The number of series connections of the remaining effective cells is obtained based on the integer voltage ratio and the number N of individual cells that have been historically eliminated.

[0028] In the technical solution of this application embodiment, the voltage ratio of the maximum single cell voltage to the remaining total voltage in the latest single cell voltage sequence is obtained. Since the low voltage of each single cell in the latest single cell voltage sequence has been concentrated towards the middle value, the obtained voltage ratio can more accurately represent the true number of series connections. Furthermore, rounding is performed to further improve the accuracy of the final number of series connections calculation.

[0029] In some embodiments, the total energy of the battery system after fault repair is adjusted based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, including:

[0030] Obtain the original total energy of the battery system in its original state after the fault repair;

[0031] The remaining total energy of the battery system after fault repair is obtained based on the total number of remaining effective cells, the original total number of cells, and the original total energy.

[0032] In the technical solution of this application embodiment, the original total capacity of the battery system after fault repair is obtained, and the remaining total energy is accurately calculated based on the total number of remaining effective cells and the original total number of cells.

[0033] In some embodiments, before obtaining the individual cell voltage and total voltage of the battery system in a fully charged state after fault repair, the method further includes:

[0034] The battery system after fault repair is charged to full capacity using a preset charging current, which is less than the rated charging current of the battery system after fault repair.

[0035] In the technical solution of this application embodiment, when charging the battery system after fault repair, a charging current less than the rated charging current is used, that is, a small current is used to charge the battery system after fault repair to a full charge state, so as to avoid overcharging of the battery system after fault repair and ensure safety.

[0036] In some embodiments, before obtaining the individual cell voltage and total voltage of the battery system in a fully charged state after fault repair, the method further includes: performing a short-circuit bridging repair on the battery system.

[0037] In the technical solution of this application embodiment, the battery system is repaired by bridging short circuit to ensure that the battery system can discharge normally after the fault is repaired.

[0038] In some embodiments, the bridging short-circuit repair of the battery system includes:

[0039] Identify the target series branch in the battery system that contains a faulty cell, and count the number M of faulty cells contained in a single target series branch;

[0040] Repair the faulty cell in the target series branch by bridging the short circuit, and short-circuit the M cells in each of the other series branches in the battery system.

[0041] In the technical solution of this application embodiment, in addition to performing cross-connection short-circuit repair on the target series branch containing the faulty cell, the same number of cells as the faulty cell are short-circuited on each other series branch in the battery system to ensure that the voltage of each branch of the entire battery system is balanced after the fault is repaired, avoid mutual charging, and extend the service life of the battery system.

[0042] Secondly, this application also provides a battery system fault handling device, the device comprising:

[0043] The parameter acquisition module is used to acquire the individual cell voltage and total voltage of the battery system under full charge after fault repair.

[0044] The counting module is used to determine the total number of remaining effective cells in the battery system after fault repair based on the individual cell voltage and the total voltage.

[0045] The correction module is used to correct the total energy of the battery system after fault repair based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair. The original state refers to the state of the battery system before the fault occurred.

[0046] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0047] Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair;

[0048] The total number of remaining effective cells in the battery system after fault repair is determined based on the individual cell voltage and the total voltage.

[0049] Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred after fault repair.

[0050] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0051] Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair;

[0052] The total number of remaining effective cells in the battery system after fault repair is determined based on the individual cell voltage and the total voltage.

[0053] Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred.

[0054] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0055] Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair;

[0056] The total number of remaining effective cells in the battery system after fault repair is determined based on the individual cell voltage and the total voltage.

[0057] Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred.

[0058] The aforementioned battery system fault handling device, computer equipment, storage medium, and computer program products perform further processing on the battery system after short-circuit bridging repair. Specifically, they first acquire the individual cell voltages and total voltage of the repaired battery system in a fully charged state. Based on the individual cell voltages and total voltage, they estimate the total number of remaining effective cells. Then, based on the remaining effective cell number and the original cell number, they process the total energy of the repaired battery system. Throughout the process, the total energy is corrected based on the remaining effective cell number and the original cell number to avoid inaccurate total energy calculations due to the reduction in effective cells after fault repair, which could affect the normal use of the repaired battery system and support accurate energy management.

[0059] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0060] Figure 1 This is a schematic diagram for repairing short circuits across a battery system connected in series.

[0061] Figure 2 This is a flowchart illustrating the battery system fault handling method of this application in one embodiment;

[0062] Figure 3 This is a schematic diagram for repairing short circuits across a battery system configured with a series-to-parallel connection.

[0063] Figure 4 This is a flowchart illustrating the battery system fault handling method of this application in another embodiment;

[0064] Figure 5 This is a schematic diagram of a sub-process of step S420 in one embodiment;

[0065] Figure 6 This is a flowchart illustrating the battery system fault handling method of this application in a specific application example;

[0066] Figure 7 This is a structural block diagram of the battery system fault handling device of this application in one embodiment;

[0067] Figure 8FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. Detailed Implementation

[0068] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0070] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0071] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0072] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0073] In general, battery systems often use a large amount of adhesive to connect and fix the cells. If a cell has an abnormal self-discharge, such as low voltage or undervoltage, the BMS (Battery Management System) will reduce the overall battery system's charge range to protect the healthy operation of that single cell. In severe cases, this can prevent the entire vehicle from powering on, while other cells in the battery system remain normal. Because current battery system structures often use a large amount of adhesive, replacing individual cells is very difficult and impractical. Repairs are often done by replacing the entire battery pack, resulting in high after-sales costs for consumers, car manufacturers, and lithium battery companies. If batteries are connected in series to meet high voltage requirements, a problem with a single cell will prevent the entire battery system from powering on, or the system can only discharge a portion of its charge. Fault repair can restore normal charging and discharging. Fault repair can involve directly disconnecting the faulty cell and using mechanical connectors to bridge it with a normal cell, thus shielding the faulty cell from the battery circuit and allowing the battery system to charge and discharge normally.

[0074] Specifically, such as Figure 1 As shown, the faulty cell is repaired by short-circuiting it in a series connection. Specifically, the series circuit includes individual cells BAT1, BAT2, BAT3, and BAT4. If cell BAT2 has a problem, it is bypassed, and a mechanical connector is used to bridge it with a normal cell (i.e., BAT1 and BAT3 are bridged), thus shielding the faulty cell BAT2 from the entire battery circuit. Simultaneously, for battery systems with a series-to-parallel configuration, a normal cell needs to be shielded in the other parallel circuit as well. This ensures voltage matching between the two branches of the series-parallel circuit, preventing the other branch from having a high voltage and charging the lower-voltage branch, thus avoiding overcharging and achieving normal charging and discharging of the battery system.

[0075] The inventors of this application have noticed that although the repair method can enable the repaired battery system to charge and discharge normally, the cross-connection of normal cells will reduce the total number of remaining effective cells in the battery system and reduce the total capacity of the battery system. This will lead to inaccurate estimation of the total energy of the entire battery system, which in turn will lead to inaccurate estimation of remaining range / capacity, overcharging, and other situations. This will cause a series of problems such as lithium plating in normal batteries, shortened lifespan, and exacerbation of range anxiety for end customers, and may even affect the life safety of end customers.

[0076] To address the issue of inaccurate total energy estimation after fault repair due to the reduced number of remaining effective cells, the total energy of the battery system can be calculated by determining the total number of remaining effective cells after fault repair. This calculation, based on the original total number of cells, allows for accurate estimation of the total energy of the battery system, taking into full account the inaccurate total energy estimation caused by the reduction in the number of effective cells after fault repair. This ensures the normal operation of the battery system.

[0077] like Figure 2 As shown, this application provides a battery system fault handling method, the method including:

[0078] S200: Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair.

[0079] A repaired battery system refers to a battery system that can be charged and discharged normally after fault repair. Fault repair can be performed using jumper short-circuit repair, which involves directly shielding and short-circuiting the faulty cell.

[0080] The processing procedures differ slightly between battery systems constructed using a series connection and those constructed using a series-then-parallel connection. For battery systems constructed using a series connection, the bridging short-circuit repair process is as follows: Figure 1 As shown, the problematic cell in the series circuit is directly short-circuited, and a mechanical connector is used to bridge the problem with a normal cell. This shields the problematic cell from the problem in the entire series circuit, allowing the battery system to charge and discharge normally. The short-circuit repair method using a battery system configured with a series-to-parallel connection is shown below. Figure 3 As shown, the battery system contains multiple series branches. Each series branch contains individual cells BAT1, BAT2, BAT3, and BAT4. If cell BAT2 malfunctions, it is bypassed and a normal cell (BAT1 and BAT3) is connected via a mechanical connector. This shields the problematic cell BAT2 from the entire series branch. Simultaneously, another normal cell is also shielded in the parallel branch. This ensures voltage matching between the two branches in the series-parallel circuit, preventing the problem of one branch having a high voltage while charging the lower-voltage branch. This avoids overcharging and allows the battery system to charge and discharge normally.

[0081] A fully charged state refers to a state where the battery is fully charged. The faulty battery system is continuously charged until it is fully charged, and the voltage of each individual cell at this point is obtained. Specifically, the individual cell voltage and total voltage in a fully charged state can be collected by the battery monitoring unit. Furthermore, a smaller current can be used during the charging process.

[0082] S400: Determine the total number of remaining effective cells in the battery system after fault repair based on the individual cell voltage and the total voltage.

[0083] A battery system is composed of multiple individual battery cells connected in series, or combined in a series-then-parallel manner (e.g., ...). Figure 1 As shown and Figure 3 As shown in the diagram, the total number of remaining effective cells in the battery system after fault repair can be calculated based on the individual cell voltages and the total voltage. Individual cell voltage refers to obtaining the individual cell voltages corresponding to all individual cells in the entire battery system. If not necessary, after obtaining the individual cell voltages, these individual cell voltages can be arranged in a certain order to form an individual cell voltage sequence for further processing.

[0084] S600: Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred after fault repair.

[0085] The total number of remaining effective cells refers to the number of cells that remain in the battery system and are functioning normally after fault repair. The original total number of cells refers to the number of cells in the battery system before the fault occurred. Generally, if it is the first time performing a jump-circuit repair, the original total number of cells is the total number of cells in the battery system when it passed factory inspection. For example, if battery system A contains 100 cells when it passed factory inspection, then the original total number of cells is 100. If battery system A subsequently experiences internal cell faults, the remaining effective total number of cells obtained using the methods described in S200~S400 is 98. If it is a non-first jump-circuit repair, the original total number of cells is the number of cells it contained before the current fault occurred (i.e., before the jump-circuit repair was required). Correcting the total energy of the battery system specifically refers to recalculating the new total energy, which is used as a control parameter for the battery system after subsequent fault repair, such as a parameter for calculating the driving range of an electric vehicle. Furthermore, after obtaining the new total energy, the new total energy can be sent to the battery system's BMS so that the BMS can adaptively adjust the energy management algorithm.

[0086] In the technical solution of this application embodiment, further processing is performed on the battery system after the short-circuit bridging repair. Specifically, the individual cell voltages and total voltage of the battery system in a fully charged state are first obtained. The total number of remaining effective cells is estimated based on the individual cell voltages and total voltage. Then, the total energy of the battery system after the fault repair is processed based on the remaining effective cell number and the original cell number. Throughout the process, the total energy is corrected based on the remaining effective cell number and the original cell number to avoid inaccurate total energy calculations caused by the reduction of effective cells in the battery system after the short-circuit bridging repair, which could affect the normal use of the battery system after the fault repair and support accurate energy management.

[0087] like Figure 4 As shown, in some embodiments, S400 includes:

[0088] S420: Based on the individual cell voltage and the total voltage, obtain the number of remaining effective cells in series in the battery system after fault repair;

[0089] S440: Obtain the ratio of the original total number of battery cells to the number of cells connected in series;

[0090] S460: Round the comparison value to obtain the number of parallel connections of the remaining effective cells in the battery system after fault repair;

[0091] S480: Determine the total number of remaining effective cells in the battery system after fault repair based on the number of series and parallel connections of the remaining effective cells.

[0092] Generally, battery cells in a battery system are assembled using a series-then-parallel method. That is, the cells are first connected in series to form multiple series branches, and then these series branches are connected in parallel to form the entire battery system. (For an example, see [link to example structure]). Figure 3 Therefore, when calculating the total number of effective battery cells, the number of cells connected in series and the number of cells connected in parallel can be calculated separately.

[0093] Because series circuits divide voltage and parallel circuits divide current, the number of cells connected in series can be determined first based on the individual cell voltages. Then, based on the original total number of cells and the number of cells connected in series on a single series branch, the number of cells connected in parallel can be determined. Finally, the number of remaining effective cells can be obtained by multiplying the number of series cells by the number of parallel cells. Based on the above principle, the number of remaining effective cells in series in the battery system after fault repair can be obtained first based on the individual cell voltages and the total voltage. After obtaining the number of series cells, when calculating the number of parallel cells, first obtain the ratio of the original total number of cells to the number of series cells. In actual processing, the ratio may not be an integer, and the actual number of parallel cells cannot contain a decimal point. Therefore, the ratio is rounded up. This rounding can be done by rounding to the nearest integer, for example, if the ratio is 19.6, it is rounded to 20; or by rounding up, for example, if the ratio is 19.6, it is rounded up to 20. This ratio can be rounded to obtain the total number of parallel cells remaining in the battery system after fault repair. Based on the number of series cells multiplied by the number of parallel cells, the final number of remaining effective cells is obtained.

[0094] In the technical solution of this application embodiment, the number of series and parallel connections of the remaining effective cells is first analyzed by the voltage of individual cells and the total voltage. Then, based on the number of series and parallel connections, the total number of remaining effective cells in the battery system after fault repair is determined. The whole process does not require manual counting. In addition, the number of parallel connections is based on the original total number of cells and the number of series connections. Considering that in actual calculations, there may be situations where the ratio is not an integer, causing subsequent calculation errors (such as calculating the number of remaining effective cells containing decimals), the ratio is directly rounded before calculating the number of series and parallel connections. Finally, it can support accurate calculation of the total number of remaining effective cells.

[0095] like Figure 5 As shown, in some embodiments, S420 includes:

[0096] S422: Generate a single cell voltage sequence based on the individual cell voltage;

[0097] This generates a sequence of individual cell voltages based on the individual cell voltages of all individual cells in the entire battery system. Specifically, the individual cell voltages can be sorted from high to low or from low to high to generate the individual cell voltage sequence.

[0098] S424: Filter the maximum and minimum cell voltages in the individual cell voltage sequence.

[0099] The maximum and minimum cell voltages are selected from the individual cell voltage sequence. Here, "maximum" and "minimum" refer to the highest and lowest cell voltages within the current individual cell voltage sequence. Generally, regardless of whether the order is from high to low or low to high, the maximum and minimum cell voltages are the voltage data from the beginning and end of the entire individual cell voltage sequence, and can be directly selected from the individual cell voltage sequence.

[0100] S425: If the difference between the maximum and minimum cell voltages is greater than a preset voltage difference threshold, then remove the maximum and minimum cell voltages from the cell voltage sequence to update the cell voltage sequence and return to S424.

[0101] The preset voltage difference threshold is a pre-set threshold that is correlated with the consistency of cells within the battery system. Its specific value can be set according to actual needs, for example, it can be set to 10mV. If the difference between the maximum and minimum cell voltages is greater than the preset voltage difference threshold, it indicates that the deviation between the maximum and minimum cell voltages in the current cell voltage sequence is too large, and the concentration of cell voltages towards the median average in the current cell voltage sequence is insufficient. Directly calculating the number of cells in series by dividing the total voltage by the median value will lead to a large error. Therefore, it is necessary to remove the maximum and minimum cell voltages to update the cell voltage sequence. This yields the updated cell voltage sequence. Returning to S424, the maximum and minimum cell voltages are then filtered again for the updated cell voltage sequence.

[0102] S426: If the difference between the maximum and minimum single-cell voltages is not greater than a preset voltage difference threshold, then obtain the number N of historically removed single-cell cells.

[0103] If the difference between the maximum and minimum single cell voltages is not greater than the preset voltage difference threshold, it indicates that the single cell voltages in the current single cell voltage sequence are concentrating towards the middle average. In this case, the number of single cells can be obtained by averaging the current single cell voltage sequence.

[0104] S427: Obtain the maximum single-cell voltage and the remaining total voltage in the latest single-cell voltage sequence.

[0105] The latest refers to the individual cell voltage sequence obtained after the last cycle removes the maximum and minimum individual cell voltages. The maximum individual cell voltage and the remaining total voltage of the entire latest individual cell voltage sequence are obtained. The remaining total voltage refers to the total voltage remaining after N individual cells were removed in the past, which is specifically the total voltage - (the maximum individual cell voltage removed in the past + the minimum individual cell voltage removed in the past).

[0106] S428: Based on the number N of historically removed individual cells, the maximum individual cell voltage in the latest individual cell voltage sequence, and the remaining total voltage, obtain the number of series connections of the remaining effective cells.

[0107] Since the number of maximum and minimum single-cell voltages removed in each historical period represents the number of removed cells, this number needs to be added when calculating the final number of series-connected remaining effective cells. Additionally, because the latest single-cell voltage sequence shows a convergence of cell voltages, the number of corresponding single cells can be directly estimated by dividing the remaining total voltage by the maximum single-cell voltage. Summing these two cell counts yields the final number of series-connected remaining effective cells. In practical applications, the ratio of total voltage to maximum single-cell voltage may not be an integer, requiring rounding. Rounding down to the nearest integer is possible. Since rounding down and using the maximum single-cell voltage as the denominator are chosen, a compensation constant can be added to obtain the final number of series-connected remaining effective cells. This compensation constant is typically 1.

[0108] In some embodiments, bridging short circuit repair of the battery system includes:

[0109] Identify the target series branch containing the faulty cell in the battery system, and count the number M of faulty cells in a single target series branch; repair the faulty cell in the target series branch by bridging the short circuit, and short-circuit the M cells in each of the other series branches in the battery system.

[0110] Generally, a battery system contains multiple series branches, which are interconnected in parallel. Each series branch contains a certain number of individual battery cells, as shown in the specific structure below. Figure 3 As shown. When a cell fails in a series branch, that series branch is the target series branch. First, the faulty cell in the target series branch is short-circuited to repair it. Since other series branches are connected in parallel with the target series branch, it is necessary to short-circuit the same number of cells in each of the other series branches to avoid mutual charging between different series branches after repair, thus significantly improving battery life. It should be noted that there may be multiple faulty cells in the target series branch, such as 2 (3), in which case M is 2 (3). In this case, 2 (3) cells are short-circuited in each of the other series branches.

[0111] To explain in detail the process of determining the number of cascaded components, a specific application example will be used below.

[0112] 1. Based on the individual cell voltage, generate the individual cell voltage sequence S={4.20, 4.20, 4.21, 4.21, 4.22, 4.22, ..., 4.23, 4.23}; the total voltage is 59.2.

[0113] 2. Select the largest single-cell voltage in S as 4.23; the smallest single-cell voltage as 4.20.

[0114] 3. The difference between the maximum single-cell voltage of 4.23 and the minimum single-cell voltage of 4.20 in S is calculated to be 0.03, which is greater than the preset voltage difference threshold of 0.01;

[0115] 4. Remove the largest single cell voltage (4.23) and the smallest single cell voltage (4.20) from S to obtain the updated single cell voltage sequence S={4.21, 4.21, 4.22, ..., 4.22}. Record the number of removed largest and smallest single cell voltages N1=4.

[0116] 5. Return to step 2 and filter the largest single-cell voltage 4.22 and the smallest single-cell voltage 4.21 in S={4.21, 4.21, 4.22, ..., 4.22}, which are not greater than the preset voltage difference threshold of 0.01;

[0117] 6. The S obtained in step 5 is the latest single cell voltage sequence. The maximum single cell voltage is calculated to be 4.22, and the remaining total voltage is 59.2 - (4.20 + 4.23) = 50.77; the remaining total voltage / maximum single cell voltage = 50.77 / 4.22 = 12.03; round down to 12.

[0118] 7. N1=4, the remaining value is 12 after rounding down, and then the compensation constant 1 is added to make the final number of series connections 12+4+1=17.

[0119] In the technical solution of this application embodiment, considering the differences in consistency between different individual cells in the battery system, in order to ensure that the ratio between the final total voltage and the median value of the individual cell voltage can more accurately represent the number of series connections, the voltage of each individual cell is screened, and the largest and smallest individual cell voltages with significant differences are removed, so that the voltage of each individual cell in the updated individual cell voltage sequence moves closer to the median value, and finally the accurate number of series connections of the remaining effective cells can be obtained.

[0120] In some embodiments, the total energy of the battery system after fault repair is adjusted based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, including:

[0121] Obtain the original total energy of the battery system in its original state after fault repair; based on the total number of remaining effective cells, the original total number of cells, and the original total energy, obtain the remaining total energy of the battery system after fault repair.

[0122] Original total capacity refers to the total capacity of the battery system after fault repair, before the fault repair occurred; original total energy refers to the total energy of the battery system after fault repair, before the fault repair occurred. The remaining total energy of the battery system after fault repair is obtained based on the total number of remaining effective cells, the original total number of cells, and the original total energy, i.e., remaining total energy = (original total energy / original total number of cells) * total number of remaining effective cells.

[0123] In the technical solution of this application embodiment, the original total capacity of the battery system after fault repair is obtained, and the remaining total energy is accurately calculated based on the total number of remaining effective cells and the original total number of cells.

[0124] In some embodiments, the above-described battery system fault handling method further includes: writing the remaining total energy into the BMS of the battery system after fault repair.

[0125] As mentioned above, the number of cells in the battery system after fault repair is reduced, and its relevant attribute parameters have changed. In order to ensure accurate control by the BMS in the future, some relevant parameters can be written into the BMS. The BMS will perform battery energy management based on these newly written attribute parameters, so that the battery system after fault repair can meet the requirements of the current application scenario (load).

[0126] Furthermore, when a battery system is used as a driving energy source, the driving range of a moving object can be corrected based on the remaining total energy. For example, when a battery system is applied to an electric vehicle, the driving range of the electric vehicle can be corrected based on the remaining total energy. Specifically, the formulas for online updating of battery system energy and total driving range are: Remaining total energy = (Total energy / Original number of cells) * Remaining number of cells, Remaining total driving range = K * Original total driving range, where K = Remaining total energy / Original total energy. This correction addresses the problem of inaccurate energy estimation caused by the isolation and shielding of some individual cells in the battery system, effectively improving the accuracy of energy estimation.

[0127] In some embodiments, before obtaining the individual cell voltage and total voltage of the battery system after fault repair in a fully charged state, the method further includes: charging the battery system after fault repair to a fully charged state using a preset charging current, wherein the preset charging current is less than the rated charging current of the battery system after fault repair.

[0128] The preset charging current is a pre-set current value, which is generally a small current value. "Small" here refers to a value relative to the rated charging current of the battery system. The reason for using a small current is primarily to account for differences in battery sensitivity at different aging stages, which can cause deviations in the total voltage calculation. It also helps to avoid overcharging. In practical applications, a small current of 0.2C can be used to charge a repaired battery system until it is fully charged.

[0129] In the technical solution of this application embodiment, when charging the battery system after fault repair, a charging current less than the rated charging current is used, that is, a small current is used to charge the battery system to a full charge state to avoid overcharging and ensure safety. To illustrate the technical solution and effects of the battery system fault handling method of this application in detail, specific application examples will be used below. For example... Figure 6 As shown, the entire plan includes the following:

[0130] 1. The battery pack shows a low voltage.

[0131] 2. The battery monitoring unit detects low voltage and locks the low-voltage battery pack, i.e., locks the faulty battery pack;

[0132] 3. The faulty battery pack was sent to after-sales service for repair, and monitoring confirmed low voltage individual cells.

[0133] 4. Repair the faulty battery pack by short-circuiting the problematic cells.

[0134] 5. Prepare for BMS algorithm update;

[0135] 6. The battery monitoring unit collects the voltage of individual cells in the fault-repair battery pack;

[0136] 7. Determine the number of remaining effective cells in the fault-repaired battery by using the total voltage of the fault-repaired battery and the individual cell voltage obtained in step 6.

[0137] 8. Shield the voltage signal of the shielded and isolated battery cell;

[0138] 9. Based on the number of remaining effective cells obtained in step 7, update the total energy of the battery pack and write these updated parameters into the BMS to complete the BMS algorithm update.

[0139] 10. Fault repair: The battery pack can charge and discharge normally, meeting the requirements of the scenario (load).

[0140] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0141] Based on the same inventive concept, this application also provides a battery system fault handling device for implementing the battery system fault handling method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more battery system fault handling device embodiments provided below can be found in the limitations of the battery system fault handling method described above, and will not be repeated here.

[0142] like Figure 7 As shown, a battery system fault handling device is provided, comprising:

[0143] The parameter acquisition module 200 is used to acquire the individual cell voltage and total voltage of the battery system in a fully charged state after fault repair.

[0144] The counting module 400 is used to determine the total number of remaining effective cells in the battery system after fault repair based on the individual cell voltage and the total voltage.

[0145] The correction module 600 is used to correct the total energy value of the battery system after fault repair based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair. The original state refers to the state of the battery system before the fault occurred.

[0146] The aforementioned battery system fault handling device further processes the battery system after short-circuit repair. Specifically, it first acquires the individual cell voltages and total voltage of the repaired battery system in a fully charged state. Based on the individual cell voltages and total voltage, it estimates the total number of remaining effective cells. Then, based on the remaining effective cell number and the original cell number, it processes the total energy of the repaired battery system. Throughout the process, the total energy is corrected based on the remaining effective cell number and the original cell number to avoid inaccurate total energy calculations due to the reduction in effective cells after fault repair, which could affect the normal use of the repaired battery system and support accurate energy management.

[0147] In some embodiments, the counting module 400 is further configured to obtain the number of series-connected remaining effective cells in the battery system after fault repair based on the individual cell voltage and the total voltage; obtain the ratio of the original total number of cells to the number of series-connected cells; round the ratio to obtain the number of parallel-connected remaining effective cells in the battery system after fault repair; and determine the total number of remaining effective cells in the battery system after fault repair based on the number of series-connected and parallel-connected remaining effective cells.

[0148] In some embodiments, the counting module 400 is further configured to generate a single cell voltage sequence based on the single cell voltage; filter the maximum and minimum single cell voltages in the single cell voltage sequence; if the difference between the maximum and minimum single cell voltages is greater than a preset voltage difference threshold, then remove the maximum and minimum single cell voltages from the single cell voltage sequence to update the single cell voltage sequence, and return to the step of filtering the maximum and minimum single cell voltages in the single cell voltage sequence; if the difference between the maximum and minimum single cell voltages is not greater than the preset voltage difference threshold, then obtain the number N of previously removed single cells; obtain the maximum single cell voltage and the remaining total voltage in the latest single cell voltage sequence; and obtain the number of series connections of the remaining valid cells based on the number N of previously removed single cells, the maximum single cell voltage in the latest single cell voltage sequence, and the remaining total voltage.

[0149] In some embodiments, the counting module 400 is further configured to obtain the voltage ratio of the maximum single cell voltage to the remaining total voltage in the latest single cell voltage sequence; round the voltage ratio to obtain an integer voltage ratio; and obtain the number of series connections of the remaining effective cells based on the integer voltage ratio and the number N of single cells that have been eliminated in the past.

[0150] In some embodiments, the correction module 600 is further configured to obtain the original total energy of the battery system in its original state after fault repair; and to obtain the remaining total energy of the battery system after fault repair based on the remaining number of effective cells, the original number of cells, and the original total energy.

[0151] In some embodiments, the battery system fault handling device further includes a charging module for charging the fault-repaired battery system to full charge using a preset charging current, wherein the preset charging current is less than the rated charging current of the fault-repaired battery system.

[0152] In some embodiments, the battery system fault handling device further includes a fault repair module for performing cross-connection short circuit repair on the battery system.

[0153] In some embodiments, the fault repair module is further configured to identify a target series branch in the battery system containing a faulty cell, and count the number M of faulty cells contained in a single target series branch; perform short-circuit repair on the faulty cells in the target series branch, and short-circuit M cells in each of the other series branches in the battery system. Each module in the above-described battery system fault handling device can be implemented entirely or partially through software, hardware, or a combination thereof. Each module can be embedded in hardware or independently of the processor in a computer device, or stored in software in the memory of a computer device, so that the processor can call and execute the operations corresponding to each module.

[0154] In some embodiments, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 8 As shown, the computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a battery system fault handling method. The display screen can be an LCD screen or an e-ink display screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0155] Those skilled in the art will understand that Figure 8 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0156] In some embodiments, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0157] Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair;

[0158] The total number of remaining effective cells in the battery system after fault repair is determined based on the individual cell voltage and the total voltage.

[0159] Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred.

[0160] In some embodiments, when the processor executes a computer program, it further performs the following steps:

[0161] Based on the individual cell voltage and the total voltage, obtain the number of series-connected remaining effective cells in the battery system after fault repair; obtain the ratio of the original total number of cells to the number of series-connected cells; round the ratio to obtain the number of parallel-connected remaining effective cells in the battery system after fault repair; based on the number of series-connected and parallel-connected remaining effective cells, determine the total number of remaining effective cells in the battery system after fault repair.

[0162] In some embodiments, when a processor executes a computer program, it further performs the following steps:

[0163] Based on the individual cell voltage, a single cell voltage sequence is generated; the maximum and minimum single cell voltages in the single cell voltage sequence are filtered; if the difference between the maximum and minimum single cell voltages is greater than a preset voltage difference threshold, the maximum and minimum single cell voltages in the single cell voltage sequence are removed to update the single cell voltage sequence, and the process returns to the step of filtering the maximum and minimum single cell voltages in the single cell voltage sequence; if the difference between the maximum and minimum single cell voltages is not greater than the preset voltage difference threshold, the number N of previously removed single cells is obtained; the maximum single cell voltage and the remaining total voltage in the latest single cell voltage sequence are obtained; based on the number N of previously removed single cells, the maximum single cell voltage in the latest single cell voltage sequence, and the remaining total voltage, the number of series connections of the remaining valid cells is obtained.

[0164] In some embodiments, when the processor executes a computer program, it further performs the following steps:

[0165] Obtain the voltage ratio of the maximum single cell voltage to the remaining total voltage in the latest single cell voltage sequence; round the voltage ratio to obtain an integer voltage ratio; based on the integer voltage ratio and the number N of single cells that have been removed in history, obtain the number of series connections of the remaining effective cells.

[0166] In some embodiments, when the processor executes a computer program, it further performs the following steps:

[0167] Obtain the original total energy of the battery system in its original state after fault repair; based on the total number of remaining effective cells, the original total number of cells, and the original total energy, obtain the remaining total energy of the battery system after fault repair.

[0168] In some embodiments, when the processor executes a computer program, it further performs the following steps:

[0169] The battery system after fault repair is charged to full capacity using a preset charging current, which is less than the rated charging current of the battery system after fault repair.

[0170] In some embodiments, when the processor executes a computer program, it further performs the following steps:

[0171] Repair the battery system by bridging the short circuit.

[0172] In some embodiments, when the processor executes a computer program, it further performs the following steps:

[0173] Identify the target series branch containing the faulty cell in the battery system, and count the number M of faulty cells in a single target series branch; repair the faulty cell in the target series branch by bridging the short circuit, and short-circuit the M cells in each of the other series branches in the battery system.

[0174] In some embodiments, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0175] Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair;

[0176] The total number of remaining effective cells in the battery system after fault repair is determined based on the individual cell voltage and the total voltage.

[0177] Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred.

[0178] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0179] Based on the individual cell voltage and the total voltage, obtain the number of series-connected remaining effective cells in the battery system after fault repair; obtain the ratio of the original total number of cells to the number of series-connected cells; round the ratio to obtain the number of parallel-connected remaining effective cells in the battery system after fault repair; based on the number of series-connected and parallel-connected remaining effective cells, determine the total number of remaining effective cells in the battery system after fault repair.

[0180] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0181] Based on the individual cell voltage, a single cell voltage sequence is generated; the maximum and minimum single cell voltages in the single cell voltage sequence are filtered; if the difference between the maximum and minimum single cell voltages is greater than a preset voltage difference threshold, the maximum and minimum single cell voltages in the single cell voltage sequence are removed to update the single cell voltage sequence, and the process returns to the step of filtering the maximum and minimum single cell voltages in the single cell voltage sequence; if the difference between the maximum and minimum single cell voltages is not greater than the preset voltage difference threshold, the number N of previously removed single cells is obtained; the maximum single cell voltage and the remaining total voltage in the latest single cell voltage sequence are obtained; based on the number N of previously removed single cells, the maximum single cell voltage in the latest single cell voltage sequence, and the remaining total voltage, the number of series connections of the remaining valid cells is obtained.

[0182] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0183] Obtain the voltage ratio of the maximum single cell voltage to the remaining total voltage in the latest single cell voltage sequence; round the voltage ratio to obtain an integer voltage ratio; based on the integer voltage ratio and the number N of single cells that have been removed in history, obtain the number of series connections of the remaining effective cells.

[0184] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0185] Obtain the original total energy of the battery system in its original state after fault repair; based on the total number of remaining effective cells, the original total number of cells, and the original total energy, obtain the remaining total energy of the battery system after fault repair.

[0186] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0187] The battery system after fault repair is charged to full capacity using a preset charging current, which is less than the rated charging current of the battery system after fault repair.

[0188] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0189] Repair the battery system by bridging the short circuit.

[0190] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0191] Identify the target series branch containing the faulty cell in the battery system, and count the number M of faulty cells in a single target series branch; repair the faulty cell in the target series branch by bridging the short circuit, and short-circuit the M cells in each of the other series branches in the battery system.

[0192] In some embodiments, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0193] Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair;

[0194] The total number of remaining effective cells in the battery system after fault repair is determined based on the individual cell voltage and the total voltage.

[0195] Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred after fault repair.

[0196] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0197] Based on the individual cell voltage and the total voltage, obtain the number of series-connected remaining effective cells in the battery system after fault repair; obtain the ratio of the original total number of cells to the number of series-connected cells; round the ratio to obtain the number of parallel-connected remaining effective cells in the battery system after fault repair; based on the number of series-connected and parallel-connected remaining effective cells, determine the total number of remaining effective cells in the battery system after fault repair.

[0198] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0199] Based on the individual cell voltage, a single cell voltage sequence is generated; the maximum and minimum single cell voltages in the single cell voltage sequence are filtered; if the difference between the maximum and minimum single cell voltages is greater than a preset voltage difference threshold, the maximum and minimum single cell voltages in the single cell voltage sequence are removed to update the single cell voltage sequence, and the process returns to the step of filtering the maximum and minimum single cell voltages in the single cell voltage sequence; if the difference between the maximum and minimum single cell voltages is not greater than the preset voltage difference threshold, the number N of previously removed single cells is obtained; the maximum single cell voltage and the remaining total voltage in the latest single cell voltage sequence are obtained; based on the number N of previously removed single cells, the maximum single cell voltage in the latest single cell voltage sequence, and the remaining total voltage, the number of series connections of the remaining valid cells is obtained.

[0200] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0201] Obtain the voltage ratio of the maximum single cell voltage to the remaining total voltage in the latest single cell voltage sequence; round the voltage ratio to obtain an integer voltage ratio; based on the integer voltage ratio and the number N of single cells that have been removed in history, obtain the number of series connections of the remaining effective cells.

[0202] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0203] Obtain the original total energy of the battery system in its original state after fault repair; based on the total number of remaining effective cells, the original total number of cells, and the original total energy, obtain the remaining total energy of the battery system after fault repair.

[0204] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0205] The battery system after fault repair is charged to full capacity using a preset charging current, which is less than the rated charging current of the battery system after fault repair.

[0206] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0207] Repair the battery system by bridging the short circuit.

[0208] In some embodiments, when a computer program is executed by a processor, it further performs the following steps:

[0209] Identify the target series branch containing the faulty cell in the battery system, and count the number M of faulty cells in a single target series branch; repair the faulty cell in the target series branch by bridging the short circuit, and short-circuit the M cells in each of the other series branches in the battery system.

[0210] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, or programmable processors.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery system fault handling method, characterized in that, The method includes: Obtain the individual cell voltage and total voltage of the battery system under full charge after fault repair; Based on the individual cell voltage and the total voltage, determine the total number of remaining effective cells in the battery system after the fault repair. Based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, the total energy of the battery system after fault repair is corrected. The original state refers to the state of the battery system before the fault occurred. The step of determining the total number of remaining effective cells in the battery system after fault repair based on the individual cell voltage and the total voltage includes: Based on the individual cell voltage, a single cell voltage sequence is generated; Filter the maximum and minimum cell voltages in the individual cell voltage sequence; If the difference between the maximum and minimum cell voltages is greater than a preset voltage difference threshold, then the maximum and minimum cell voltages in the cell voltage sequence are removed to update the cell voltage sequence, and the process returns to the step of filtering the maximum and minimum cell voltages in the cell voltage sequence. If the difference between the maximum single-cell voltage and the minimum single-cell voltage is not greater than a preset voltage difference threshold, then obtain the number N of historically removed single-cell cells. Obtain the maximum single-cell voltage and the remaining total voltage in the latest single-cell voltage sequence; Based on the number N of historically removed individual cells, the maximum individual cell voltage in the latest individual cell voltage sequence, and the remaining total voltage, the number of series connections of the remaining effective cells is obtained. Obtain the ratio of the original total number of battery cells to the number of cells connected in series; The ratio is rounded down to obtain the number of parallel-connected remaining effective cells in the battery system after the fault is repaired; Based on the number of series connections and the number of parallel connections of the remaining effective cells, the total number of remaining effective cells in the battery system after the fault is repaired is determined.

2. The method according to claim 1, characterized in that, The step of obtaining the number of series-connected remaining effective cells based on the number N of historically removed individual cells, the maximum individual cell voltage in the latest individual cell voltage sequence, and the remaining total voltage includes: Obtain the voltage ratio of the maximum single cell voltage to the remaining total voltage in the latest single cell voltage sequence; The voltage ratio is rounded down to obtain an integer value. The number of series connections of the remaining effective cells is obtained based on the integer value of the voltage ratio and the number N of historically eliminated individual cells.

3. The method according to claim 1, characterized in that, The step of correcting the total energy of the battery system after fault repair, based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after fault repair, includes: Obtain the original total energy of the battery system after the fault repair in its original state; The remaining total energy of the battery system after fault repair is obtained based on the total number of remaining effective cells, the original total number of cells, and the original total energy.

4. The method according to claim 1, characterized in that, Before obtaining the individual cell voltages and total voltage of the battery system after fault repair in a fully charged state, the process also includes: The battery system after fault repair is charged to full capacity using a preset charging current, wherein the preset charging current is less than the rated charging current of the battery system after fault repair.

5. The method according to claim 1, wherein Before obtaining the individual cell voltages and total voltage of the battery system after fault repair in a fully charged state, the process also includes: Repair the battery system by bridging the short circuit.

6. The method according to claim 5, characterized in that, The battery system short-circuit repair includes: Identify the target series branch in the battery system that contains a faulty cell, and count the number M of faulty cells contained in a single target series branch; Repair the faulty cell in the target series branch by bridging the short circuit, and short-circuit the M cells in each of the other series branches in the battery system.

7. A battery system fault handling device, characterized in that, The device includes: The parameter acquisition module is used to acquire the individual cell voltage and total voltage of the battery system under full charge after fault repair. The counting module is used to determine the total number of remaining effective cells in the battery system after the fault is repaired, based on the voltage of the individual cell and the total voltage. The correction module is used to correct the total energy of the battery system after the fault is repaired based on the total number of remaining effective cells and the original total number of cells in the original state of the battery system after the fault is repaired. The original state refers to the state of the battery system before the fault occurred. The counting module is further configured to: generate a single-cell voltage sequence based on the single-cell voltage; filter the maximum and minimum single-cell voltages in the single-cell voltage sequence; if the difference between the maximum and minimum single-cell voltages is greater than a preset voltage difference threshold, then remove the maximum and minimum single-cell voltages from the single-cell voltage sequence to update the single-cell voltage sequence, and return to perform the operation of filtering the maximum and minimum single-cell voltages in the single-cell voltage sequence; if the difference between the maximum and minimum single-cell voltages is not greater than the preset voltage difference threshold, then... Obtain the number N of historically removed individual cells; obtain the maximum single-cell voltage and the remaining total voltage in the latest individual cell voltage sequence; based on the number N of historically removed individual cells, the maximum single-cell voltage in the latest individual cell voltage sequence, and the remaining total voltage, obtain the number of series-connected remaining effective cells; obtain the ratio of the original total number of cells to the number of series-connected cells; round the ratio to obtain the number of parallel-connected remaining effective cells in the battery system after fault repair; based on the number of series-connected and parallel-connected remaining effective cells, determine the total number of remaining effective cells in the battery system after fault repair.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

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

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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