Method and device for detecting short circuit in battery, and computer storage medium

Abstract

The invention relates to the technical field of batteries, and discloses a battery internal short circuit detection method and device, and a computer storage medium, and the method comprises the steps: carrying out the cell load adjustment of a to-be-tested battery, obtaining a load-adjusted battery, and enabling the battery to comprise one or more cells; in the standing process of the battery, collecting open-circuit voltage data of each battery cell at each collection moment in a plurality of preset collection moments; and according to the open-circuit voltage data of all the cells at all the acquisition moments, performing short-circuit detection on the interior of the battery after load adjustment to obtain an internal detection result of the battery. Therefore, by implementing the method, the accuracy and the efficiency of detecting whether the short circuit occurs in the battery can be improved, so that the processing accuracy and the timeliness of the short circuit condition in the battery can be improved under the condition that the short circuit occurs in the battery, and the safety problem possibly occurring in the subsequent battery charging and discharging process can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a method and device for detecting short circuits in batteries, and a computer storage medium. Background Art

[0002] During the assembly process of lithium-ion battery cores and core packs, foreign objects may be introduced, which may pierce the diaphragm and cause a short circuit between the positive and negative electrodes. If a short circuit occurs and is not handled in time, it is easy to cause safety problems during the subsequent battery charging and discharging process. Therefore, it is necessary to add a process to detect whether the battery cell has a short circuit. At present, common methods for detecting short circuit points in batteries include: (1) Hipot withstand voltage insulation test detection method, which is a method of applying a higher voltage to the battery cell, monitoring the leakage current, calculating the resistance, and determining whether there is a short circuit inside the battery cell; (2) Aging self-discharge test detection method, which is a method of determining whether there is a short circuit inside the battery cell by testing the self-discharge rate of the battery cell.

[0003] However, practice has found that the disadvantage of the Hipot test method is that the unfilled coil is not only resistive but also capacitive, which makes the test value easily affected by stray capacitance, resulting in low accuracy of the test result of whether there is a short circuit inside the battery cell; the disadvantage of the aging self-discharge test is that the self-discharge rate of the battery cell is easily affected by parameters such as temperature, battery cell state of charge (SOC), test time, and test instrument accuracy, which easily results in low accuracy of the test result of whether there is a short circuit inside the battery cell. It can be seen that it is particularly important to propose a technical solution to improve the accuracy of detecting whether there is a short circuit in a lithium-ion battery. Summary of the invention

[0004] The present invention provides a method and device for detecting short circuits in a battery, and a computer storage medium, which can improve the accuracy and efficiency of detecting whether a short circuit occurs in a battery, are conducive to improving the accuracy and timeliness of handling short circuits in the battery, and are conducive to reducing safety problems that may occur in subsequent battery charging and discharging processes.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a method for detecting short circuit in a battery, the method comprising:

[0006] Performing a cell charge adjustment process on the battery to be tested to obtain a charge-adjusted battery, wherein the battery includes one or more cells;

[0007] During the static state of the battery, collecting the open circuit voltage data of each of the battery cells at each of the preset multiple collection moments;

[0008] According to the open circuit voltage data of all the cells at all the acquisition moments, a short circuit detection is performed on the interior of the battery after the charge adjustment to obtain an internal detection result of the battery.

[0009] As an optional implementation, in the first aspect of the present invention, the short circuit detection is performed on the inside of the battery after charge adjustment according to the open circuit voltage data of all the cells at all the acquisition moments to obtain the internal detection result of the battery, including:

[0010] Calculate target test data of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments, wherein the target test data includes: an open circuit voltage change value corresponding to a preset static time length, and / or a determined open circuit voltage change rate in each acquisition time period;

[0011] According to the target test data of each battery cell, determine whether there is a short circuit point in each battery cell, and obtain a short circuit determination result for each battery cell;

[0012] The internal detection result of the battery is determined according to the short circuit judgment results of all the battery cells.

[0013] As an optional implementation, in the first aspect of the present invention, the target test data of each battery cell is calculated according to the open circuit voltage data of each battery cell at all the acquisition moments, including:

[0014] According to the open circuit voltage data of each battery cell at all the collection moments, initial open circuit voltage data corresponding to an initial collection moment is screened out from all the open circuit voltage data of each battery cell;

[0015] According to all the open circuit voltage data of each of the battery cells, target open circuit voltage data satisfying a preset static condition is screened out from all the open circuit voltage data of the battery cell;

[0016] The difference between the initial open circuit voltage data and the target open circuit voltage data is calculated to obtain the open circuit voltage change value of each of the battery cells.

[0017] As an optional implementation manner, in the first aspect of the present invention, the step of filtering out target open circuit voltage data satisfying a preset static condition from all open circuit voltage data of each of the battery cells according to all open circuit voltage data of the battery cell comprises:

[0018] Establishing an open circuit voltage change curve of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments; and judging whether there is open circuit voltage data satisfying a preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell;

[0019] When it is determined that there is open circuit voltage data satisfying the voltage change condition, determining the open circuit voltage data satisfying the voltage change condition as target open circuit voltage data satisfying the preset static condition;

[0020] When it is determined that all the open circuit voltage data of the battery cell do not meet the voltage change condition, the target collection time is determined from all the collection times according to all the open circuit voltage data of each of the battery cells and the preset static time; and the open circuit voltage data corresponding to the target collection time is determined as the target open circuit voltage data that meets the preset static condition.

[0021] As an optional implementation, in the first aspect of the present invention, judging whether there is open circuit voltage data satisfying a preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each of the battery cells includes:

[0022] Obtaining a voltage standard change trend corresponding to a preset static end condition;

[0023] For each of the battery cells, dividing the open circuit voltage change curve according to the open circuit voltage change curve of the battery cell to obtain the open circuit voltage change trend of the battery cell in one or more voltage change stages;

[0024] Calculating the degree of conformity of the change trend of the battery cell in each voltage change stage according to the change trend of the open circuit voltage of the battery cell in each voltage change stage and the change trend of the voltage standard;

[0025] According to the change trend fit of the battery cell in all the voltage change stages, determining whether there is a target voltage change stage in all the voltage change stages in which the change trend fit is greater than or equal to a preset fit;

[0026] When it is determined that there is a target voltage change stage in which the degree of fit of the change trend is greater than or equal to the preset degree of fit, one of the open circuit voltage data corresponding to the target voltage change stage and having the smallest corresponding collection time is selected as the open circuit voltage data that meets the preset voltage change condition;

[0027] When it is determined that the degree of fit of the change trend of the battery cell in all the voltage change stages is less than the preset degree of fit, it is determined that all open circuit voltage data of the battery cell do not meet the preset voltage change condition.

[0028] As an optional implementation, in the first aspect of the present invention, the target test data of each battery cell is calculated according to the open circuit voltage data of each battery cell at all the acquisition moments, including:

[0029] Determine multiple collection time periods according to all the collection moments;

[0030] Calculating the open circuit voltage difference of each battery cell in each collection time period according to the open circuit voltage data of each battery cell in each collection time period;

[0031] For each of the battery cells, each of the acquisition time periods is used as a differential operator, and the open circuit voltage difference of the battery cell in the corresponding acquisition time period is used as a differential variable to calculate the open circuit voltage change rate of the battery cell in each of the acquisition time periods.

[0032] As an optional implementation manner, in the first aspect of the present invention, judging whether there is a short-circuit point in each of the battery cells according to the target test data of each of the battery cells, and obtaining the short-circuit judgment result of each of the battery cells, includes:

[0033] For each of the battery cells, determining whether the open circuit voltage change value of the battery cell is less than a preset voltage change value, which is recorded as a first condition; and / or,

[0034] For each of the battery cells, determine whether the open circuit voltage change rate of the battery cell in all the acquisition time periods is less than a preset voltage change rate, or is greater than the preset voltage change rate, which is recorded as the second condition;

[0035] Among them, when the first condition and / or the second condition is met, the short-circuit judgment result of the battery cell is determined to be that there is a short-circuit point in the battery cell; when both the first condition and the second condition are not met, the short-circuit judgment result of the battery cell is determined to be that there is no short-circuit point in the battery cell.

[0036] As an optional implementation, in the first aspect of the present invention, during the static state of the battery, collecting the open circuit voltage data of each of the battery cells at each of the preset multiple collection moments includes:

[0037] Obtaining battery parameters of the battery after load adjustment;

[0038] During the static state of the battery, the battery after charge adjustment is placed in a preset pressure applying device; and the pressure control parameters of the pressure applying device are determined according to the battery parameters;

[0039] Electrically connecting the corresponding cells of the battery after charge adjustment through a plurality of voltage collection components included in a preset voltage collection device;

[0040] According to the pressure control parameter of the pressure applying device, the pressure applying device is controlled to perform a pressure applying operation on the battery after the load adjustment, so that the open circuit voltage of the battery after the load adjustment changes, wherein the pressure control parameter includes the pressure magnitude and the continuous application time corresponding to the pressure magnitude;

[0041] During the execution of the pressure applying operation, for each of the battery cells, the open circuit voltage data of the battery cell is collected at each of the preset multiple collection moments through a voltage collection component electrically connected to the battery cell.

[0042] A second aspect of the present invention discloses a device for detecting short circuit in a battery, the device comprising:

[0043] A processing module, used for performing a cell charge adjustment process on the battery to be tested to obtain a charge-adjusted battery, wherein the battery includes one or more cells;

[0044] A collection module, used for collecting the open circuit voltage data of each of the battery cells at each of the preset multiple collection moments during the static state of the battery;

[0045] The detection module is used to perform short-circuit detection on the inside of the battery after charge adjustment according to the open-circuit voltage data of all the cells at all the acquisition moments, so as to obtain the internal detection result of the battery.

[0046] As an optional implementation, in the second aspect of the present invention, the detection module performs short circuit detection on the inside of the battery after charge adjustment according to the open circuit voltage data of all the cells at all the acquisition moments, and the method of obtaining the internal detection result of the battery specifically includes:

[0047] Calculate target test data of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments, wherein the target test data includes: an open circuit voltage change value corresponding to a preset static time length, and / or a determined open circuit voltage change rate in each acquisition time period;

[0048] According to the target test data of each battery cell, determine whether there is a short circuit point in each battery cell, and obtain a short circuit determination result for each battery cell;

[0049] The internal detection result of the battery is determined according to the short circuit judgment results of all the battery cells.

[0050] As an optional implementation, in the second aspect of the present invention, the detection module calculates the target test data of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments, specifically including:

[0051] According to the open circuit voltage data of each battery cell at all the collection moments, initial open circuit voltage data corresponding to an initial collection moment is screened out from all the open circuit voltage data of each battery cell;

[0052] According to all the open circuit voltage data of each of the battery cells, target open circuit voltage data satisfying a preset static condition is screened out from all the open circuit voltage data of the battery cell;

[0053] The difference between the initial open circuit voltage data and the target open circuit voltage data is calculated to obtain the open circuit voltage change value of each of the battery cells.

[0054] As an optional implementation, in the second aspect of the present invention, the detection module selects the target open circuit voltage data that meets the preset static condition from all the open circuit voltage data of each of the battery cells according to all the open circuit voltage data of the battery cell, specifically including:

[0055] Establishing an open circuit voltage change curve of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments; and judging whether there is open circuit voltage data satisfying a preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell;

[0056] When it is determined that there is open circuit voltage data satisfying the voltage change condition, determining the open circuit voltage data satisfying the voltage change condition as target open circuit voltage data satisfying the preset static condition;

[0057] When it is determined that all the open circuit voltage data of the battery cell do not meet the voltage change condition, the target collection time is determined from all the collection times according to all the open circuit voltage data of each of the battery cells and the preset static time; and the open circuit voltage data corresponding to the target collection time is determined as the target open circuit voltage data that meets the preset static condition.

[0058] As an optional implementation, in the second aspect of the present invention, the detection module determines whether there is open circuit voltage data that meets the preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell, specifically including:

[0059] Obtaining a voltage standard change trend corresponding to a preset static end condition;

[0060] For each of the battery cells, dividing the open circuit voltage change curve according to the open circuit voltage change curve of the battery cell to obtain the open circuit voltage change trend of the battery cell in one or more voltage change stages;

[0061] Calculating the degree of conformity of the change trend of the battery cell in each voltage change stage according to the change trend of the open circuit voltage of the battery cell in each voltage change stage and the change trend of the voltage standard;

[0062] According to the change trend fit of the battery cell in all the voltage change stages, determining whether there is a target voltage change stage in all the voltage change stages in which the change trend fit is greater than or equal to a preset fit;

[0063] When it is determined that there is a target voltage change stage in which the degree of fit of the change trend is greater than or equal to the preset degree of fit, one of the open circuit voltage data corresponding to the target voltage change stage and having the smallest corresponding collection time is selected as the open circuit voltage data that meets the preset voltage change condition;

[0064] When it is determined that the degree of fit of the change trend of the battery cell in all the voltage change stages is less than the preset degree of fit, it is determined that all open circuit voltage data of the battery cell do not meet the preset voltage change condition.

[0065] As an optional implementation, in the second aspect of the present invention, the detection module calculates the target test data of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments, specifically including:

[0066] Determine multiple collection time periods according to all the collection moments;

[0067] Calculating the open circuit voltage difference of each battery cell in each collection time period according to the open circuit voltage data of each battery cell in each collection time period;

[0068] For each of the battery cells, each of the acquisition time periods is used as a differential operator, and the open circuit voltage difference of the battery cell in the corresponding acquisition time period is used as a differential variable to calculate the open circuit voltage change rate of the battery cell in each of the acquisition time periods.

[0069] As an optional implementation, in the second aspect of the present invention, the detection module determines whether there is a short circuit point in each of the battery cells according to the target test data of each of the battery cells, and the method of obtaining the short circuit judgment result of each of the battery cells specifically includes:

[0070] For each of the battery cells, determining whether the open circuit voltage change value of the battery cell is less than a preset voltage change value, which is recorded as a first condition; and / or,

[0071] For each of the battery cells, determine whether the open circuit voltage change rate of the battery cell in all the acquisition time periods is less than a preset voltage change rate, or is greater than the preset voltage change rate, which is recorded as the second condition;

[0072] Among them, when the first condition and / or the second condition is met, the short-circuit judgment result of the battery cell is determined to be that there is a short-circuit point in the battery cell; when both the first condition and the second condition are not met, the short-circuit judgment result of the battery cell is determined to be that there is no short-circuit point in the battery cell.

[0073] As an optional implementation, in the second aspect of the present invention, the acquisition module acquires the open circuit voltage data of each of the battery cells at each of the preset multiple acquisition moments during the static state of the battery, specifically including:

[0074] Obtaining battery parameters of the battery after load adjustment;

[0075] During the static state of the battery, the battery after charge adjustment is placed in a preset pressure applying device; and the pressure control parameters of the pressure applying device are determined according to the battery parameters;

[0076] Electrically connecting the corresponding cells of the battery after charge adjustment through a plurality of voltage collection components included in a preset voltage collection device;

[0077] According to the pressure control parameter of the pressure applying device, the pressure applying device is controlled to perform a pressure applying operation on the battery after the load adjustment, so that the open circuit voltage of the battery after the load adjustment changes, wherein the pressure control parameter includes the pressure magnitude and the continuous application time corresponding to the pressure magnitude;

[0078] During the execution of the pressure applying operation, for each of the battery cells, the open circuit voltage data of the battery cell is collected at each of the preset multiple collection moments through a voltage collection component electrically connected to the battery cell.

[0079] The third aspect of the present invention discloses another device for detecting short circuit in a battery, the device comprising:

[0080] A memory storing executable program code;

[0081] a processor coupled to the memory;

[0082] The processor calls the executable program code stored in the memory to execute the method for detecting short circuit in a battery disclosed in the first aspect of the present invention.

[0083] The fourth aspect of the present invention discloses a computer storage medium, wherein the computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the method for detecting short circuits in batteries disclosed in the first aspect of the present invention.

[0084] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0085] In an embodiment of the present invention, a battery to be tested is subjected to a cell charge adjustment process to obtain a battery after the charge adjustment, and the battery includes one or more cells; during the static process of the battery, the open circuit voltage data of each cell at each collection time within a plurality of preset collection times is collected; according to the open circuit voltage data of all cells at all collection times, a short circuit detection is performed on the inside of the battery after the charge adjustment to obtain the internal detection result of the battery. It can be seen that the implementation of the present invention can improve the accuracy and efficiency of the pre-treatment of the battery before detecting whether a short circuit occurs in the battery, which is conducive to improving the accuracy of the subsequent detection of whether a short circuit occurs in the battery; compared with the method of directly using the voltage during the battery charging process for detection in the prior art, this scheme can improve the accuracy and efficiency of the detection of whether a short circuit occurs in the battery based on the open circuit voltage data obtained by the test by setting a short circuit detection process before charging, thereby facilitating the improvement of the accuracy and timeliness of the processing of the short circuit situation in the battery when a short circuit occurs in the battery, and further facilitating the reduction of safety problems that may occur in the subsequent battery charging and discharging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0087] Figure 1 It is a flow chart of a method for detecting short circuit in a battery disclosed in an embodiment of the present invention;

[0088] Figure 2 It is a flow chart of another method for detecting short circuit in a battery disclosed in an embodiment of the present invention;

[0089] Figure 3 It is a structural schematic diagram of a device for detecting short circuit in a battery disclosed in an embodiment of the present invention;

[0090] Figure 4 It is a schematic structural diagram of another device for detecting short circuit in a battery disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0091] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0092] The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, device, product or end including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or ends.

[0093] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0094] The present invention discloses a method and device for detecting short circuits in a battery, and a computer storage medium, which can perform cell charge adjustment processing on a battery to be tested to obtain a battery after charge adjustment, and can improve the accuracy and efficiency of pre-processing the battery before detecting whether a short circuit occurs in the battery, which is conducive to improving the accuracy of subsequent detection of whether a short circuit occurs in the battery; subsequently, during the static process of the battery, the open circuit voltage data of each cell at each collection moment in a plurality of preset collection moments is collected, and the internal short circuit detection of the battery after charge adjustment is performed according to the open circuit voltage data of all cells at all collection moments, and the internal detection result of the battery is obtained. Compared with the method of directly using the voltage during the battery charging process for detection in the prior art, this scheme can improve the accuracy and efficiency of detecting whether a short circuit occurs in the battery based on the open circuit voltage data obtained by the test by setting a short circuit detection process before charging, thereby facilitating the improvement of the accuracy and timeliness of processing the short circuit situation in the battery when a short circuit occurs in the battery, and further facilitating the reduction of safety problems that may occur in the subsequent battery charging and discharging process. The following are detailed descriptions respectively.

[0095] Embodiment 1

[0096] See also Figure 1 , Figure 1 1 is a flow chart of a method for detecting short circuit in a battery disclosed in an embodiment of the present invention. Figure 1 The method for detecting short circuits in batteries described above can be applied to a device for detecting short circuits in batteries, wherein the device may include a detection device or a detection server, wherein the detection server may include a cloud server or a local server, which is not limited in the embodiments of the present invention. Figure 1 As shown, the method for detecting short circuit in the battery may include the following operations:

[0097] 101. Perform cell charge adjustment on the battery to be tested to obtain a charge-adjusted battery.

[0098] In an embodiment of the present invention, the battery may include one or more battery cells. Optionally, the battery cell charge adjustment method may include one or more combinations of constant current charging, constant voltage charging, and constant power charging. Specifically, according to the requirements of the battery at different stages of the charging process, different battery cell charge adjustment methods are used to dynamically adjust the battery state of charge to achieve the best charge adjustment effect.

[0099] 102. When the battery is at rest, collect the open circuit voltage data of each battery cell at each collection time within a plurality of preset collection time points.

[0100] In the embodiment of the present invention, specifically, after the battery is charged, it can be left to stand so that the open circuit voltage (OCV) of the battery is relatively stable, which is convenient for subsequent detection. Optionally, the collection interval between each collection moment can be 10 seconds, 15 seconds, or any other set value, which is not limited by the embodiment of the present invention. For example, during the battery standing process, the open circuit voltage of the battery cell is collected every n seconds (such as every 10 seconds).

[0101] 103. According to the open circuit voltage data of all the cells at all the acquisition moments, a short circuit detection is performed on the inside of the battery after the charge adjustment to obtain the internal detection result of the battery.

[0102] In the embodiment of the present invention, specifically, the internal detection result of the battery may include that at least one of all the battery cells included in the battery has a short-circuit point, or that none of the battery cells included in the battery has a short-circuit point.

[0103] It can be seen that implementation Figure 1The described method for detecting short circuits in batteries can perform charge adjustment processing on the battery to be tested to obtain the battery after charge adjustment, and can improve the accuracy and efficiency of pre-processing the battery before detecting whether a short circuit occurs in the battery, which is beneficial to improving the accuracy of subsequent detection of whether a short circuit occurs in the battery; then, during the static process of the battery, the open circuit voltage data of each battery cell at each collection moment within a plurality of preset collection moments is collected, and based on the open circuit voltage data of all batteries at all collection moments, the internal part of the battery after charge adjustment is detected to obtain the internal detection result of the battery. Compared with the method of directly using the voltage during the battery charging process for detection in the prior art, this scheme can improve the accuracy and efficiency of detecting whether a short circuit occurs in the battery based on the open circuit voltage data obtained by the test by setting a short circuit detection process before charging, thereby facilitating improving the accuracy and timeliness of processing the short circuit situation in the battery when a short circuit occurs in the battery, and further facilitating reducing the safety problems that may occur in the subsequent battery charging and discharging process.

[0104] In an optional embodiment, in the above step 102, during the static process of the battery, collecting the open circuit voltage data of each battery cell at each of the preset multiple collection moments may include:

[0105] Obtain battery parameters of the battery after load adjustment;

[0106] During the static state of the battery, the battery after charge adjustment is placed in a preset pressure applying device; and the pressure control parameters of the pressure applying device are determined according to the battery parameters;

[0107] Electrically connecting the multiple voltage collection components included in the preset voltage collection device to the corresponding cells included in the charge-adjusted battery;

[0108] According to the pressure control parameter of the pressure applying device, the pressure applying device is controlled to perform a pressure applying operation on the battery after the charge adjustment, so that the open circuit voltage of the battery after the charge adjustment changes;

[0109] During the execution of the pressure applying operation, for each battery cell, the open circuit voltage data of the battery cell is collected at each of a plurality of preset collection moments through a voltage collection component electrically connected to the battery cell.

[0110] In the embodiment of the present invention, the pressure control parameter may optionally include the pressure magnitude and the duration of continuous application corresponding to the pressure magnitude. Specifically, the pressure magnitude to be applied by the pressure applying device and the duration of continuous application corresponding to the pressure magnitude are determined according to one or more combinations of the current magnitude, voltage magnitude, charging power and cell capacity included in the battery parameters as the pressure control parameters of the pressure applying device.

[0111] For example, the charged battery cell is placed in a pressure-applying device, and each voltage collection component (such as a probe) contained in a voltage collection device (such as an OCV machine) contacts the positive and negative poles of the corresponding battery cell, so that each probe is electrically connected to the corresponding battery cell, thereby detecting the OCV of the battery cell, and collecting OCV every n seconds, wherein the pressure-applying device can apply x kilograms of force to the battery cell and continue to apply it for y seconds. The voltage collection device uploads the collected OCV data (OCV1, OCV2, OCV3, ..., OCVm) to the detection device / detection server in order of detection time. Among them, OCV1 is used to represent the OCV data collected for the first time (nth second), OCV2 is used to represent the OCV data collected for the second time (2*nth second), and so on.

[0112] It can be seen that this optional embodiment can obtain the battery parameters of the battery after charge adjustment, and place the battery after charge adjustment in a preset pressure applying device during the static state of the battery; and determine the pressure control parameters of the pressure applying device according to the battery parameters, thereby improving the accuracy and efficiency of determining the pressure control parameters of the pressure applying device, and electrically connecting the multiple voltage acquisition components contained in the preset voltage acquisition device with the corresponding battery cells contained in the battery after charge adjustment, and then controlling the pressure applying device to perform a pressure application operation on the battery after charge adjustment according to the pressure control parameters of the pressure applying device, so that the open circuit voltage of the battery after charge adjustment changes; and in the process of executing the pressure application operation, for each battery cell, through the voltage acquisition component electrically connected to the battery cell, collect the open circuit voltage data of the battery cell at each collection moment within the preset multiple collection moments, which can improve the accuracy and reliability of collecting the open circuit voltage data of each battery cell based on the linkage control of the pressure applying device and the voltage acquisition device.

[0113] Embodiment 2

[0114] See also Figure 2 , Figure 2 1 is a flow chart of a method for detecting short circuit in a battery disclosed in an embodiment of the present invention. Figure 2 The method for detecting short circuits in batteries described above can be applied to a device for detecting short circuits in batteries, wherein the device may include a detection device or a detection server, wherein the detection server may include a cloud server or a local server, which is not limited in the embodiments of the present invention. Figure 2 As shown, the method for detecting short circuit in the battery may include the following operations:

[0115] 201. Perform cell charge adjustment on the battery to be tested to obtain a charge-adjusted battery.

[0116] 202. While the battery is at rest, collect open circuit voltage data of each battery cell at each of a plurality of preset collection moments.

[0117] 203. Calculate target test data of each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments.

[0118] In an embodiment of the present invention, the target test data includes: the open circuit voltage change value corresponding to the preset static time length, and / or the determined open circuit voltage change rate in each acquisition time period. Among them, the start time and end time of each acquisition time period can be one of all acquisition times, and the number of acquisition times included in each acquisition time period can be greater than or equal to 2. For example, assuming that the OCV voltage of the battery cell is collected once every n seconds, each acquisition time period can be n seconds or 3*n seconds, which is not limited in the embodiment of the present invention.

[0119] 204. According to the target test data of each battery cell, determine whether there is a short circuit point in each battery cell, and obtain a short circuit determination result of each battery cell.

[0120] In the embodiment of the present invention, optionally, the short circuit judgment result of each battery cell may include the result that each battery cell has a short circuit point, or the result that each battery cell does not have a short circuit point, which is not limited in the embodiment of the present invention.

[0121] 205. Determine the internal detection result of the battery based on the short circuit judgment results of all battery cells.

[0122] In an embodiment of the present invention, when the short-circuit judgment result of at least one battery cell is that the battery cell has a short-circuit point, it is determined that a short circuit occurs in the battery; when the short-circuit judgment results of all battery cells are that the battery cell does not have a short-circuit point, it is determined that no short circuit occurs in the battery.

[0123] In the embodiment of the present invention, for other descriptions of step 201 to step 205, please refer to the detailed description of step 101 to step 103 in the first embodiment, and the embodiment of the present invention will not be repeated.

[0124] It can be seen that implementation Figure 2The described method for detecting short circuits in batteries can perform charge adjustment processing on the battery to be tested to obtain the battery after charge adjustment, and can improve the accuracy and efficiency of pre-processing the battery before detecting whether a short circuit occurs in the battery, which is beneficial to improving the accuracy of subsequent detection of whether a short circuit occurs in the battery; then, during the static process of the battery, the open circuit voltage data of each battery cell at each collection moment within a plurality of preset collection moments is collected, and based on the open circuit voltage data of all batteries at all collection moments, the internal part of the battery after charge adjustment is detected to obtain the internal detection result of the battery. Compared with the method of directly using the voltage during the battery charging process for detection in the prior art, this scheme can improve the accuracy and efficiency of detecting whether a short circuit occurs in the battery based on the open circuit voltage data obtained by the test by setting a short circuit detection process before charging, thereby facilitating improving the accuracy and timeliness of processing the short circuit situation in the battery when a short circuit occurs in the battery, and further facilitating reducing the safety problems that may occur in the subsequent battery charging and discharging process. In addition, the target test data of each battery cell, such as the open circuit voltage change value and the open circuit voltage change rate, can be calculated based on the open circuit voltage data of each battery cell at all acquisition moments, which can improve the calculation accuracy and efficiency of the target test data used for short circuit detection, and is conducive to improving the diversity and flexibility of the calculated target test data. Subsequently, based on the target test data of each battery cell, it is determined whether each battery cell has a short circuit point, and the short circuit judgment result of each battery cell is obtained. Based on the diversified target test data, the accuracy and flexibility of judging whether each battery cell has a short circuit point can be improved, and then the internal detection result of the battery can be determined based on the short circuit judgment results of all battery cells, which can improve the detection accuracy and reliability of whether a short circuit occurs in the battery.

[0125] In an optional embodiment, the step 203 of calculating the target test data of each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments may include:

[0126] According to the open circuit voltage data of each battery cell at all the acquisition moments, the initial open circuit voltage data corresponding to the initial acquisition moment is screened out from all the open circuit voltage data of each battery cell;

[0127] According to all the open circuit voltage data of each battery cell, target open circuit voltage data satisfying a preset static condition is screened out from all the open circuit voltage data of the battery cell;

[0128] The difference between the initial open circuit voltage data and the target open circuit voltage data is calculated to obtain the open circuit voltage change value of each battery cell.

[0129] In an embodiment of the present invention, the initial acquisition moment may be the moment when the open circuit voltage is first acquired. Optionally, the preset static condition may include a condition that the static time reaches a preset time, or may include a condition that the electrochemical reaction inside the battery cell is completely balanced during the static process. Among them, whether the electrochemical reaction inside the battery cell is balanced can be characterized by the open circuit voltage of the battery cell, such as: when the open circuit voltage of the battery cell gradually tends to be stable, it can indicate that the electrochemical reaction inside the battery cell has reached equilibrium, which is not limited in the embodiment of the present invention.

[0130] For example, the initial open circuit voltage data is recorded as OCV1, the target open circuit voltage data is recorded as OCVn, and the open circuit voltage change value of each battery cell is recorded as A. The open circuit voltage change value can be calculated by A=OCVn-OCV1.

[0131] It can be seen that this optional embodiment can filter out the initial open circuit voltage data corresponding to the initial collection moment from all the open circuit voltage data of each battery cell according to the open circuit voltage data of each battery cell at all the collection moments, and filter out the target open circuit voltage data that meets the preset static conditions from all the open circuit voltage data of each battery cell according to all the open circuit voltage data of the battery cell, thereby improving the screening accuracy and efficiency of the initial open circuit voltage data and the target open circuit voltage data, and then calculating the difference between the initial open circuit voltage data and the target open circuit voltage data to obtain the open circuit voltage change value of each battery cell, thereby improving the calculation accuracy and reliability of the open circuit voltage change value of each battery cell.

[0132] In this optional embodiment, as an optional implementation manner, according to all the open circuit voltage data of each battery cell, selecting the target open circuit voltage data that meets the preset static condition from all the open circuit voltage data of the battery cell may include:

[0133] Establishing an open circuit voltage change curve for each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments; and judging whether there is open circuit voltage data that meets a preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell;

[0134] When it is determined that there is open circuit voltage data satisfying the voltage change condition, determining the open circuit voltage data satisfying the voltage change condition as target open circuit voltage data satisfying the preset static condition;

[0135] When it is determined that all open circuit voltage data of the battery cell do not meet the voltage change condition, the target collection time is determined from all collection times according to all open circuit voltage data of each battery cell and the preset static time; and the open circuit voltage data corresponding to the target collection time is determined as the target open circuit voltage data that meets the preset static condition.

[0136] In an embodiment of the present invention, optionally, the preset voltage change condition may include a condition that an open-circuit voltage change curve meets a preset standard change curve, or may include a condition that an open-circuit voltage change trend at a certain voltage change stage corresponding to the open-circuit voltage change curve meets a preset voltage standard change trend, and the present invention is not limited to this embodiment.

[0137] Specifically, establishing an open circuit voltage variation curve of each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments may include:

[0138] According to the open circuit voltage data of each battery cell at all acquisition moments, each acquisition moment is used as the data of the x-axis, and the open circuit voltage data of each battery cell at each acquisition moment is used as the data of the y-axis to establish the open circuit voltage change curve of each battery cell.

[0139] It can be seen that this optional implementation method can establish the open circuit voltage change curve of each battery cell according to the open circuit voltage data of each battery cell at all collection moments, thereby improving the accuracy and efficiency of establishing the open circuit voltage change curve of each battery cell; and according to the open circuit voltage change curve of each battery cell, it is judged whether there is open circuit voltage data that meets the preset voltage change condition among all the open circuit voltage data of the battery cell. When it is judged that there is, the open circuit voltage data that meets the voltage change condition is directly determined as the target open circuit voltage data that meets the preset static condition, which can improve the speed and efficiency of determining the target open circuit voltage data; when it is judged that there is no, the target collection moment is determined from all collection moments according to all the open circuit voltage data of each battery cell and the preset static time; and the open circuit voltage data corresponding to the target collection moment is determined as the target open circuit voltage data that meets the preset static condition, which can improve the accuracy and reliability of determining the target open circuit voltage data based on the target collection moment corresponding to the static time when all the open circuit voltage data do not meet the voltage change condition.

[0140] It can be seen that this optional implementation can also determine whether there is open circuit voltage data that meets the preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell, which may include:

[0141] Obtaining a voltage standard change trend corresponding to a preset static end condition;

[0142] For each battery cell, according to the open circuit voltage change curve of the battery cell, the open circuit voltage change curve is divided to obtain the open circuit voltage change trend of the battery cell in one or more voltage change stages;

[0143] According to the open circuit voltage change trend and the voltage standard change trend of the battery cell in each voltage change stage, the degree of conformity of the change trend of the battery cell in each voltage change stage is calculated;

[0144] According to the change trend fit of the battery cell in all voltage change stages, it is determined whether there is a target voltage change stage in all voltage change stages where the change trend fit is greater than or equal to a preset fit;

[0145] When it is determined that there is a target voltage change stage with a change trend fit greater than or equal to a preset fit, one of the open circuit voltage data corresponding to the target voltage change stage with the smallest corresponding collection time is selected as the open circuit voltage data that meets the preset voltage change condition;

[0146] When it is determined that the degree of fit of the change trend of the battery cell in all voltage change stages is less than the preset degree of fit, it is determined that all open circuit voltage data of the battery cell do not meet the preset voltage change condition.

[0147] In the embodiment of the present invention, specifically, the voltage standard change trend is a trend that the change of the open circuit voltage gradually tends to be flat. When the voltage gradually tends to be flat, it is used to indicate that the static process can be ended. All voltage change stages included in the open circuit voltage change curve may include one or more combinations of the initial stage of voltage change during the static process, the stage of rapid voltage change during the static process, and the stage of slow voltage change during the static process. Optionally, the preset fit degree can be 60%, or 85%, or any other set value, which is not limited in the embodiment of the present invention.

[0148] It can be seen that this optional implementation manner can also obtain the voltage standard change trend corresponding to the preset static end condition, and divide the open circuit voltage change curve according to the open circuit voltage change curve of each battery cell to obtain the open circuit voltage change trend of the battery cell in one or more voltage change stages, and calculate the change trend fit of the battery cell in each voltage change stage according to the open circuit voltage change trend of the battery cell in each voltage change stage and the voltage standard change trend, thereby improving the calculation accuracy and reliability of the change trend fit used as the basis for judging the voltage change condition, and then according to the change trend fit of the battery cell in all voltage change stages , determine whether there is a target voltage change stage with a higher degree of fit in the change trend among all the voltage change stages. When it is determined that there is, directly select one of the open circuit voltage data corresponding to the target voltage change stage with the smallest corresponding collection time as the open circuit voltage data that meets the preset voltage change conditions, which can improve the determination speed and accuracy of the open circuit voltage data that meets the preset voltage change conditions. When it is determined that the fit corresponding to all the change trends is low, it is determined that all the open circuit voltage data of the battery cell do not meet the preset voltage change conditions, which improves the determination accuracy and reliability of the open circuit voltage data that does not meet the preset voltage change conditions.

[0149] In another optional embodiment, the calculation of target test data of each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments in the above step 203 may include:

[0150] Determine multiple collection time periods based on all collection moments;

[0151] Calculate the open circuit voltage difference of each battery cell in each collection time period according to the open circuit voltage data of each battery cell in each collection time period;

[0152] For each battery cell, each acquisition time period is used as a differential operator, and the open circuit voltage difference of the battery cell in the corresponding acquisition time period is used as a differential variable to calculate the open circuit voltage change rate of the battery cell in each acquisition time period.

[0153] In the embodiment of the present invention, specifically, according to a preset target time interval, all collection moments are grouped to obtain multiple collection moment groups, each collection moment group includes two collection moments, and the time interval between the two collection moments in each collection moment group is the target time interval; for each collection moment group, the collection moment in the collection moment group with the earlier time is taken as the starting time, and the collection moment in the collection moment group with the later time is taken as the ending time, to determine a collection time period.

[0154] For example, for any battery cell, each collection time period is taken as a differential operator, denoted as dt, and the open circuit voltage difference of the battery cell in each collection time period is taken as a differential variable, denoted as dV. The calculation formula for the open circuit voltage change rate of the battery cell in each collection time period (denoted as B) can be: B=dV / dt. Further, it can also be B=dV / / dt (integer division operation). The open circuit voltage change rate of the battery cell in all collection time periods can be expressed in the form of a series, such as: (B1, B2, ..., Bm), where m is the number of collection time periods.

[0155] It can be seen that this optional embodiment can determine multiple collection time periods based on all collection moments, and accurately calculate the open circuit voltage difference of each battery cell in each collection time period based on the open circuit voltage data of each battery cell in each collection time period, and then use each collection time period as a differential operator, and use the open circuit voltage difference of each battery cell in the corresponding collection time period as a differential variable to calculate the open circuit voltage change rate of the battery cell in each collection time period, thereby improving the calculation accuracy and reliability of the open circuit voltage change rate in each collection time period.

[0156] In yet another optional embodiment, judging whether there is a short-circuit point in each battery cell according to the target test data of each battery cell and obtaining the short-circuit judgment result of each battery cell may include:

[0157] For each battery cell, determining whether the open circuit voltage change value of the battery cell is less than a preset voltage change value, which is recorded as a first condition; and / or,

[0158] For each battery cell, determine whether the open circuit voltage change rate of the battery cell in all acquisition time periods is less than a preset voltage change rate, or is greater than a preset voltage change rate, which is recorded as the second condition;

[0159] Among them, when the first condition and / or the second condition is met, the short-circuit judgment result of the battery cell is determined to be that the battery cell has a short-circuit point; when both the first condition and the second condition are not met, the short-circuit judgment result of the battery cell is determined to be that the battery cell does not have a short-circuit point.

[0160] In the embodiment of the present invention, specifically, multiple determination conditions are set to detect whether there is a short-circuit point in the battery cell. Specifically, determination condition 1: if the open circuit voltage change value (such as the above-mentioned A value) is less than the set value, it is determined that there is a short-circuit point in the battery cell; determination condition 2: if all open circuit voltage change rates of the battery cell (such as the above-mentioned B1, B2, ..., Bn) are less than or greater than the set value, it is determined that there is a short-circuit point in the battery cell; determination condition 3: if determination condition 1 and determination condition 2 are not met at the same time, it is determined that there is no short-circuit point in the battery cell.

[0161] It can be seen that this optional embodiment can determine whether the open circuit voltage change value of each battery cell is less than the preset voltage change value, which is recorded as the first condition; and / or, determine whether the open circuit voltage change rate of the battery cell in all collection time periods is less than the preset voltage change rate, or is greater than the preset voltage change rate, which is recorded as the second condition; and when the first condition and / or the second condition is met, the short circuit judgment result of the battery cell is determined to be that the battery cell has a short circuit point; when both the first condition and the second condition are not met, the short circuit judgment result of the battery cell is determined to be that the battery cell does not have a short circuit point, which can improve the diversity and flexibility of judging whether the battery cell has a short circuit point based on the open circuit voltage change value and the open circuit voltage change rate, and is conducive to improving the accuracy and reliability of judging whether the battery cell has a short circuit point.

[0162] Embodiment 3

[0163] See also Figure 3 , Figure 3 1 is a schematic diagram of a structure of a device for detecting short circuit in a battery disclosed in an embodiment of the present invention. Figure 3 The apparatus for detecting short circuits in batteries may include a detection device or a detection server, wherein the detection server may include a cloud server or a local server, which is not limited in the embodiments of the present invention. Figure 3 As shown, the device for detecting short circuit in the battery may include:

[0164] The processing module 301 is used to perform a cell charge adjustment process on the battery to be tested to obtain a battery after charge adjustment, where the battery includes one or more cells;

[0165] The acquisition module 302 is used to acquire the open circuit voltage data of each battery cell at each of a plurality of preset acquisition moments during the static state of the battery;

[0166] The detection module 303 is used to perform short-circuit detection on the inside of the battery after charge adjustment according to the open-circuit voltage data of all cells at all collection moments, and obtain the internal detection result of the battery.

[0167] It can be seen that implementation Figure 3 The described device for detecting short circuits in a battery can perform charge adjustment processing on the battery to be tested to obtain a battery after charge adjustment, and can improve the accuracy and efficiency of pre-processing the battery before detecting whether a short circuit occurs in the battery, which is beneficial to improving the accuracy of subsequent detection of whether a short circuit occurs in the battery; then, during the static process of the battery, the open circuit voltage data of each battery cell at each collection moment within a plurality of preset collection moments is collected, and based on the open circuit voltage data of all batteries at all collection moments, a short circuit detection is performed on the inside of the battery after charge adjustment to obtain an internal detection result of the battery. Compared with the method of directly using the voltage during the battery charging process for detection in the prior art, this scheme can improve the accuracy and efficiency of detecting whether a short circuit occurs in the battery based on the open circuit voltage data obtained from the test by setting a short circuit detection process before charging, thereby facilitating improving the accuracy and timeliness of processing the short circuit situation in the battery when a short circuit occurs in the battery, and further facilitating reducing safety problems that may occur during the subsequent battery charging and discharging process.

[0168] In an optional embodiment, the detection module 303 performs short circuit detection on the inside of the battery after charge adjustment according to the open circuit voltage data of all cells at all acquisition moments, and the method of obtaining the internal detection result of the battery may specifically include:

[0169] Calculate the target test data of each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments, the target test data including: the open circuit voltage change value corresponding to the preset static time length, and / or the determined open circuit voltage change rate in each acquisition time period;

[0170] According to the target test data of each battery cell, determine whether there is a short circuit point in each battery cell, and obtain the short circuit judgment result of each battery cell;

[0171] The internal detection results of the battery are determined based on the short-circuit judgment results of all the cells.

[0172] It can be seen that this optional embodiment can calculate the target test data of each battery cell, such as the open circuit voltage change value and the open circuit voltage change rate, based on the open circuit voltage data of each battery cell at all acquisition moments, which can improve the calculation accuracy and efficiency of the target test data used for short circuit detection, and is conducive to improving the diversity and flexibility of the calculated target test data. Subsequently, based on the target test data of each battery cell, it is determined whether there is a short circuit point in each battery cell to obtain the short circuit judgment result of each battery cell. The accuracy and flexibility of judging whether a short circuit point exists in each battery cell can be improved based on the diversified target test data. Then, based on the short circuit judgment results of all battery cells, the internal detection result of the battery is determined, which can improve the detection accuracy and reliability of whether a short circuit occurs in the battery.

[0173] In this optional embodiment, as an optional implementation, the detection module 303 calculates the target test data of each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments, which may specifically include:

[0174] According to the open circuit voltage data of each battery cell at all the acquisition moments, the initial open circuit voltage data corresponding to the initial acquisition moment is screened out from all the open circuit voltage data of each battery cell;

[0175] According to all the open circuit voltage data of each battery cell, target open circuit voltage data satisfying a preset static condition is screened out from all the open circuit voltage data of the battery cell;

[0176] The difference between the initial open circuit voltage data and the target open circuit voltage data is calculated to obtain the open circuit voltage change value of each battery cell.

[0177] It can be seen that this optional implementation method can filter out the initial open circuit voltage data corresponding to the initial collection moment from all the open circuit voltage data of each battery cell according to the open circuit voltage data of each battery cell at all the collection moments, and filter out the target open circuit voltage data that meets the preset static conditions from all the open circuit voltage data of each battery cell according to all the open circuit voltage data of the battery cell, thereby improving the screening accuracy and efficiency of the initial open circuit voltage data and the target open circuit voltage data, and then calculating the difference between the initial open circuit voltage data and the target open circuit voltage data to obtain the open circuit voltage change value of each battery cell, thereby improving the calculation accuracy and reliability of the open circuit voltage change value of each battery cell.

[0178] In this optional implementation, optionally, the detection module 303 selects the target open circuit voltage data that meets the preset static condition from all the open circuit voltage data of each battery cell according to all the open circuit voltage data of the battery cell, which may specifically include:

[0179] Establishing an open circuit voltage change curve for each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments; and judging whether there is open circuit voltage data that meets a preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell;

[0180] When it is determined that there is open circuit voltage data satisfying the voltage change condition, determining the open circuit voltage data satisfying the voltage change condition as target open circuit voltage data satisfying the preset static condition;

[0181] When it is determined that all open circuit voltage data of the battery cell do not meet the voltage change condition, the target collection time is determined from all collection times according to all open circuit voltage data of each battery cell and the preset static time; and the open circuit voltage data corresponding to the target collection time is determined as the target open circuit voltage data that meets the preset static condition.

[0182] It can be seen that this optional implementation manner can also establish an open circuit voltage change curve for each battery cell according to the open circuit voltage data of each battery cell at all collection moments, thereby improving the accuracy and efficiency of establishing the open circuit voltage change curve for each battery cell; and according to the open circuit voltage change curve of each battery cell, determine whether there is open circuit voltage data that meets the preset voltage change condition among all the open circuit voltage data of the battery cell. When it is determined that there is, directly determine the open circuit voltage data that meets the voltage change condition as the target open circuit voltage data that meets the preset static condition, which can improve the speed and efficiency of determining the target open circuit voltage data; when it is determined that there is no, determine the target collection moment from all collection moments according to all the open circuit voltage data of each battery cell and the preset static time; and determine the open circuit voltage data corresponding to the target collection moment as the target open circuit voltage data that meets the preset static condition, which can improve the accuracy and reliability of determining the target open circuit voltage data based on the target collection moment corresponding to the static time when all the open circuit voltage data do not meet the voltage change condition.

[0183] In this optional implementation, the detection module 303 may optionally determine whether there is open circuit voltage data satisfying the preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell, by:

[0184] Obtaining a voltage standard change trend corresponding to a preset static end condition;

[0185] For each battery cell, according to the open circuit voltage change curve of the battery cell, the open circuit voltage change curve is divided to obtain the open circuit voltage change trend of the battery cell in one or more voltage change stages;

[0186] According to the open circuit voltage change trend and the voltage standard change trend of the battery cell in each voltage change stage, the degree of conformity of the change trend of the battery cell in each voltage change stage is calculated;

[0187] According to the change trend fit of the battery cell in all voltage change stages, it is determined whether there is a target voltage change stage in all voltage change stages where the change trend fit is greater than or equal to a preset fit;

[0188] When it is determined that there is a target voltage change stage with a change trend fit greater than or equal to a preset fit, one of the open circuit voltage data corresponding to the target voltage change stage with the smallest corresponding collection time is selected as the open circuit voltage data that meets the preset voltage change condition;

[0189] When it is determined that the degree of fit of the change trend of the battery cell in all voltage change stages is less than the preset degree of fit, it is determined that all open circuit voltage data of the battery cell do not meet the preset voltage change condition.

[0190] It can be seen that this optional implementation manner can also obtain the voltage standard change trend corresponding to the preset static end condition, and divide the open circuit voltage change curve according to the open circuit voltage change curve of each battery cell to obtain the open circuit voltage change trend of the battery cell in one or more voltage change stages, and calculate the change trend fit of the battery cell in each voltage change stage according to the open circuit voltage change trend of the battery cell in each voltage change stage and the voltage standard change trend, thereby improving the calculation accuracy and reliability of the change trend fit used as the basis for judging the voltage change condition, and then according to the change trend fit of the battery cell in all voltage change stages , determine whether there is a target voltage change stage with a higher degree of fit in the change trend among all the voltage change stages. When it is determined that there is, directly select one of the open circuit voltage data corresponding to the target voltage change stage with the smallest corresponding collection time as the open circuit voltage data that meets the preset voltage change conditions, which can improve the determination speed and accuracy of the open circuit voltage data that meets the preset voltage change conditions. When it is determined that the fit corresponding to all the change trends is low, it is determined that all the open circuit voltage data of the battery cell do not meet the preset voltage change conditions, which improves the determination accuracy and reliability of the open circuit voltage data that does not meet the preset voltage change conditions.

[0191] In this optional embodiment, as another optional implementation, the detection module 303 calculates the target test data of each battery cell according to the open circuit voltage data of each battery cell at all acquisition moments, which may specifically include:

[0192] Determine multiple collection time periods based on all collection moments;

[0193] Calculate the open circuit voltage difference of each battery cell in each collection time period according to the open circuit voltage data of each battery cell in each collection time period;

[0194] For each battery cell, each acquisition time period is used as a differential operator, and the open circuit voltage difference of the battery cell in the corresponding acquisition time period is used as a differential variable to calculate the open circuit voltage change rate of the battery cell in each acquisition time period.

[0195] It can be seen that this optional implementation method can determine multiple collection time periods based on all collection moments, and accurately calculate the open circuit voltage difference of each battery cell in each collection time period based on the open circuit voltage data of each battery cell in each collection time period, and then use each collection time period as a differential operator, and use the open circuit voltage difference of each battery cell in the corresponding collection time period as a differential variable to calculate the open circuit voltage change rate of the battery cell in each collection time period, thereby improving the calculation accuracy and reliability of the open circuit voltage change rate in each collection time period.

[0196] In this optional embodiment, as another optional implementation, the detection module 303 determines whether there is a short circuit point in each battery cell according to the target test data of each battery cell, and the method of obtaining the short circuit judgment result of each battery cell may specifically include:

[0197] For each battery cell, determining whether the open circuit voltage change value of the battery cell is less than a preset voltage change value, which is recorded as a first condition; and / or,

[0198] For each battery cell, determine whether the open circuit voltage change rate of the battery cell in all acquisition time periods is less than a preset voltage change rate, or is greater than a preset voltage change rate, which is recorded as the second condition;

[0199] Among them, when the first condition and / or the second condition is met, the short-circuit judgment result of the battery cell is determined to be that the battery cell has a short-circuit point; when both the first condition and the second condition are not met, the short-circuit judgment result of the battery cell is determined to be that the battery cell does not have a short-circuit point.

[0200] It can be seen that this optional implementation can determine whether the open circuit voltage change value of each battery cell is less than the preset voltage change value, which is recorded as the first condition; and / or, determine whether the open circuit voltage change rate of the battery cell in all collection time periods is less than the preset voltage change rate, or is greater than the preset voltage change rate, which is recorded as the second condition; and when the first condition and / or the second condition is met, the short circuit judgment result of the battery cell is determined to be that the battery cell has a short circuit point; when both the first condition and the second condition are not met, the short circuit judgment result of the battery cell is determined to be that the battery cell does not have a short circuit point, which can improve the diversity and flexibility of judging whether the battery cell has a short circuit point based on the open circuit voltage change value and the open circuit voltage change rate, and is conducive to improving the accuracy and reliability of judging whether the battery cell has a short circuit point.

[0201] In another optional embodiment, the acquisition module 302 may acquire the open circuit voltage data of each battery cell at each acquisition time within a plurality of preset acquisition times during the battery standing still process, specifically including:

[0202] Obtain battery parameters of the battery after load adjustment;

[0203] During the static state of the battery, the battery after charge adjustment is placed in a preset pressure applying device; and the pressure control parameters of the pressure applying device are determined according to the battery parameters;

[0204] Electrically connecting the multiple voltage collection components included in the preset voltage collection device to the corresponding cells included in the charge-adjusted battery;

[0205] According to the pressure control parameters of the pressure applying device, the pressure applying device is controlled to perform a pressure applying operation on the battery after the charge adjustment, so that the open circuit voltage of the battery after the charge adjustment changes, and the pressure control parameters include the pressure magnitude and the continuous application time corresponding to the pressure magnitude;

[0206] During the execution of the pressure applying operation, for each battery cell, the open circuit voltage data of the battery cell is collected at each of a plurality of preset collection moments through a voltage collection component electrically connected to the battery cell.

[0207] It can be seen that this optional embodiment can obtain the battery parameters of the battery after charge adjustment, and place the battery after charge adjustment in a preset pressure applying device during the static state of the battery; and determine the pressure control parameters of the pressure applying device according to the battery parameters, thereby improving the accuracy and efficiency of determining the pressure control parameters of the pressure applying device, and electrically connecting the multiple voltage acquisition components contained in the preset voltage acquisition device with the corresponding battery cells contained in the battery after charge adjustment, and then controlling the pressure applying device to perform a pressure application operation on the battery after charge adjustment according to the pressure control parameters of the pressure applying device, so that the open circuit voltage of the battery after charge adjustment changes; and in the process of executing the pressure application operation, for each battery cell, through the voltage acquisition component electrically connected to the battery cell, collect the open circuit voltage data of the battery cell at each collection moment within the preset multiple collection moments, which can improve the accuracy and reliability of collecting the open circuit voltage data of each battery cell based on the linkage control of the pressure applying device and the voltage acquisition device.

[0208] Embodiment 4

[0209] See also Figure 4 , Figure 4 FIG. 1 is a schematic diagram of the structure of another device for detecting short circuit in a battery disclosed in an embodiment of the present invention. Figure 4 As shown, the device for detecting short circuit in the battery may include:

[0210] A memory 401 storing executable program codes;

[0211] a processor 402 coupled to the memory 401;

[0212] The processor 402 calls the executable program code stored in the memory 401 to execute the steps of the method for detecting short circuit in a battery described in the first embodiment of the present invention or the second embodiment of the present invention.

[0213] Embodiment 5

[0214] An embodiment of the present invention discloses a computer storage medium storing computer instructions. When the computer instructions are called, they are used to execute the steps of the method for detecting short circuits in batteries described in the first embodiment or the second embodiment of the present invention.

[0215] Embodiment 6

[0216] An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute the steps of the method for detecting short circuits in a battery described in Embodiment 1 or Embodiment 2.

[0217] The device embodiments described above are only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0218] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or partly contributed to the prior art in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0219] Finally, it should be noted that the method and device for detecting short circuits in batteries and the computer storage medium disclosed in the embodiments of the present invention are only preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for detecting short circuit in a battery, characterized in that: The method comprises: Performing a cell charge adjustment process on the battery to be tested to obtain a charge-adjusted battery, wherein the battery includes one or more cells; During the static state of the battery, collecting the open circuit voltage data of each of the battery cells at each of the preset multiple collection moments; According to the open circuit voltage data of all the cells at all the acquisition moments, a short circuit detection is performed on the interior of the battery after the charge adjustment to obtain an internal detection result of the battery.

2. The method for detecting short circuit in a battery according to claim 1, characterized in that: The method of performing short-circuit detection on the interior of the battery after charge adjustment according to the open-circuit voltage data of all the cells at all the acquisition moments to obtain the internal detection result of the battery includes: Calculate target test data of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments, wherein the target test data includes: an open circuit voltage change value corresponding to a preset static time length, and / or a determined open circuit voltage change rate in each acquisition time period; According to the target test data of each battery cell, determine whether there is a short circuit point in each battery cell, and obtain a short circuit determination result for each battery cell; The internal detection result of the battery is determined according to the short circuit judgment results of all the battery cells.

3. The method for detecting a short circuit in a battery according to claim 2, wherein: The calculating target test data of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments comprises: According to the open circuit voltage data of each battery cell at all the collection moments, initial open circuit voltage data corresponding to an initial collection moment is screened out from all the open circuit voltage data of each battery cell; According to all the open circuit voltage data of each of the battery cells, target open circuit voltage data satisfying a preset static condition is screened out from all the open circuit voltage data of the battery cell; The difference between the initial open circuit voltage data and the target open circuit voltage data is calculated to obtain the open circuit voltage change value of each of the battery cells.

4. The method for detecting short circuit in a battery according to claim 3, characterized in that: The step of selecting target open circuit voltage data satisfying a preset static condition from all the open circuit voltage data of each of the battery cells according to all the open circuit voltage data of the battery cell comprises: Establishing an open circuit voltage change curve of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments; and judging whether there is open circuit voltage data satisfying a preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each battery cell; When it is determined that there is open circuit voltage data satisfying the voltage change condition, determining the open circuit voltage data satisfying the voltage change condition as target open circuit voltage data satisfying the preset static condition; When it is determined that all the open circuit voltage data of the battery cell do not meet the voltage change condition, the target collection time is determined from all the collection times according to all the open circuit voltage data of each of the battery cells and the preset static time; and the open circuit voltage data corresponding to the target collection time is determined as the target open circuit voltage data that meets the preset static condition.

5. The method for detecting short circuit in a battery according to claim 4, characterized in that: The step of judging whether there is open circuit voltage data satisfying a preset voltage change condition among all the open circuit voltage data of the battery cell according to the open circuit voltage change curve of each of the battery cells comprises: Obtaining a voltage standard change trend corresponding to a preset static end condition; For each of the battery cells, dividing the open circuit voltage change curve according to the open circuit voltage change curve of the battery cell to obtain the open circuit voltage change trend of the battery cell in one or more voltage change stages; Calculating the degree of conformity of the change trend of the battery cell in each voltage change stage according to the change trend of the open circuit voltage of the battery cell in each voltage change stage and the change trend of the voltage standard; According to the change trend fit of the battery cell in all the voltage change stages, determining whether there is a target voltage change stage in all the voltage change stages in which the change trend fit is greater than or equal to a preset fit; When it is determined that there is a target voltage change stage in which the degree of fit of the change trend is greater than or equal to the preset degree of fit, one of the open circuit voltage data corresponding to the target voltage change stage and having the smallest corresponding collection time is selected as the open circuit voltage data that meets the preset voltage change condition; When it is determined that the degree of fit of the change trend of the battery cell in all the voltage change stages is less than the preset degree of fit, it is determined that all open circuit voltage data of the battery cell do not meet the preset voltage change condition.

6. The method for detecting short circuit in a battery according to any one of claims 2 to 5, characterized in that: The calculating target test data of each battery cell according to the open circuit voltage data of each battery cell at all the acquisition moments comprises: Determine multiple collection time periods according to all the collection moments; Calculating the open circuit voltage difference of each battery cell in each collection time period according to the open circuit voltage data of each battery cell in each collection time period; For each of the battery cells, each of the acquisition time periods is used as a differential operator, and the open circuit voltage difference of the battery cell in the corresponding acquisition time period is used as a differential variable to calculate the open circuit voltage change rate of the battery cell in each of the acquisition time periods.

7. The method for detecting short circuit in a battery according to any one of claims 2 to 5, characterized in that: The step of judging whether there is a short circuit point in each of the battery cells according to the target test data of each of the battery cells, and obtaining a short circuit judgment result of each of the battery cells, comprises: For each of the battery cells, determining whether the open circuit voltage change value of the battery cell is less than a preset voltage change value, which is recorded as a first condition; and / or, For each of the battery cells, determine whether the open circuit voltage change rate of the battery cell in all the acquisition time periods is less than a preset voltage change rate, or is greater than the preset voltage change rate, which is recorded as the second condition; Among them, when the first condition and / or the second condition is met, the short-circuit judgment result of the battery cell is determined to be that there is a short-circuit point in the battery cell; when both the first condition and the second condition are not met, the short-circuit judgment result of the battery cell is determined to be that there is no short-circuit point in the battery cell.

8. The method for detecting internal short circuit in a battery according to any one of claims 1 to 5, characterized in that: The step of collecting the open circuit voltage data of each of the cells at each of the plurality of preset collection moments during the static state of the battery comprises: Obtaining battery parameters of the battery after load adjustment; During the static state of the battery, the battery after charge adjustment is placed in a preset pressure applying device; and the pressure control parameters of the pressure applying device are determined according to the battery parameters; Electrically connecting the corresponding cells of the battery after charge adjustment through a plurality of voltage collection components included in a preset voltage collection device; According to the pressure control parameter of the pressure applying device, the pressure applying device is controlled to perform a pressure applying operation on the battery after the charge adjustment, so that the open circuit voltage of the battery after the charge adjustment changes; During the execution of the pressure applying operation, for each of the battery cells, the open circuit voltage data of the battery cell is collected at each of the preset multiple collection moments through a voltage collection component electrically connected to the battery cell.

9. A device for detecting short circuit in a battery, characterized in that: The device comprises: A memory storing executable program code; a processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the method for detecting short circuit in a battery as described in any one of claims 1 to 7.

10. A computer storage medium, characterized in that: The computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the method for detecting short circuit in a battery as described in any one of claims 1 to 7.

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