Battery self-discharge detection method, system, device, equipment, medium and product

Abstract

The invention discloses a battery self-discharge detection method, system, device and equipment, a medium and a product, and relates to the technical field of batteries, and the method comprises the steps: obtaining the real-time temperature of a battery in a heat dissipation process and a preset temperature interval corresponding to each test region; moving the battery to the corresponding test area through the battery moving unit according to a temperature matching result of the preset temperature interval of each test area and the real-time temperature; respectively detecting the K value of the battery in each test area; and judging whether self-discharge of the battery is abnormal or not according to the K value of the battery in each test area. The test areas correspond to different temperature intervals, so that the temperature difference between the batteries in the same test area is small, the influence of the high-temperature battery on the K value of the normal-temperature battery can be reduced, and the self-discharge detection accuracy is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery self-discharge detection method, system, device, equipment, medium and product. Background Art

[0002] The battery is composed of a positive electrode, a negative electrode, a separator and an electrolyte. Since there may be a micro short circuit between the positive and negative electrodes inside the battery or trace impurities in the positive and negative electrode materials and the electrolyte, the battery will have a certain degree of self-discharge. In order to ensure that the battery quality meets the requirements, it is necessary to perform a self-discharge test on the battery.

[0003] Since high temperature will accelerate the self-discharge reaction rate of the battery, the relevant technology usually performs high-temperature aging on the battery before performing self-discharge detection on the battery, and then detects the K value of the battery, that is, detects the voltage drop of the battery per unit time, and judges whether the battery has abnormal self-discharge based on the K value of the battery.

[0004] However, due to production capacity planning and site space limitations in related technologies, batteries with very high temperatures after high-temperature aging and normal-temperature batteries that have undergone K value testing for a period of time are usually mixed in the same space, causing the normal-temperature battery temperature to rise and the K value to fluctuate, resulting in low accuracy in self-discharge detection.

[0005] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0006] In view of the above problems, the present application proposes a battery self-discharge detection method, system, device, equipment, medium and product to solve the problem of inaccurate self-discharge detection caused by mixing batteries of different temperatures together.

[0007] A first aspect of the present application provides a battery self-discharge detection method, which is applied to a battery self-discharge detection system. The system includes at least two test areas and at least one battery mobile unit. The preset temperature intervals corresponding to the test areas are continuous intervals. The test areas corresponding to adjacent preset temperature intervals in the continuous interval are adjacently arranged. The method includes: Obtaining the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area; According to the temperature matching result between the preset temperature range of each test area and the real-time temperature, the battery is moved to the corresponding test area by the battery moving unit; Respectively detecting the K value of the battery in each test area; Whether the battery has abnormal self-discharge is determined according to the K value of the battery in each test area.

[0008] In the technical solution of the embodiment of the present application, at least two test areas and a battery moving unit are set, and each test area corresponds to a preset temperature interval, and the test areas corresponding to adjacent preset temperature intervals are set adjacently, so that in the process of the battery gradually dissipating heat from a relatively high temperature, the battery temperature is detected in real time, and according to the temperature matching result of the battery real-time temperature and the preset temperature interval of each test area, the battery is automatically moved to the corresponding test area through the battery moving unit, and the K value of the battery in each test area needs to be detected separately. Since each test area corresponds to a preset temperature interval, the battery can be moved to different test areas according to the real-time temperature of the battery for K value detection. The temperature difference between the batteries in the same test area is small, which can reduce the influence of the high-temperature battery on the K value of the normal temperature battery, and improve the accuracy of self-discharge detection. In addition, during the heat dissipation process of the battery, the K value of different temperature stages can be continuously obtained and an effective self-discharge abnormality judgment can be made, without the need to let the battery stand at room temperature for self-discharge detection, which can effectively shorten the battery standing time and improve the battery production rhythm.

[0009] In some embodiments, the step of moving the battery to the corresponding test area by the battery moving unit according to the temperature matching result between the preset temperature interval of each test area and the real-time temperature includes: When the real-time temperature is less than or equal to the maximum temperature in the continuous interval, determine the target preset temperature interval to which the real-time temperature belongs, and move the battery to the target test area corresponding to the target preset temperature interval through the battery moving unit; according to the real-time temperature dropping to the preset temperature interval corresponding to the next test area adjacent to the target test area, move the battery from the target test area to the next test area through the battery moving unit until the battery is moved to the test area corresponding to the smallest preset temperature interval in the continuous interval.

[0010] In this embodiment, since the preset temperature intervals corresponding to the respective test areas are continuous intervals, and the test areas of any two adjacent preset temperature intervals are arranged adjacent to each other, during the battery heat dissipation process, first when the battery temperature is less than or equal to the maximum temperature in the continuous interval, the battery is first moved to the target test area corresponding to the target preset temperature interval, and then the battery can be transferred from the target test area to the last test area in sequence according to the temperature change. In this way, the battery completes a K value test each time it passes through a test area, thereby ensuring the continuity of the battery K value test.

[0011] In some embodiments, the system further includes a static zone adjacent to the test zone corresponding to the largest preset temperature interval among the test zones, and the method further includes: When the real-time temperature is greater than the maximum temperature in the continuous interval, the battery is moved to the static area by the battery moving unit for static placement, and then when the real-time temperature is less than or equal to the maximum temperature in the continuous interval, the step of determining the target preset temperature interval to which the real-time temperature belongs is performed.

[0012] In this embodiment, during the heat dissipation process of the battery, if the initial battery temperature is higher than the preset temperature range corresponding to each test area, it means that the battery temperature is too high and is not suitable for K value detection. The battery is moved to a static area for static use, and after the temperature drops, it is moved to the target test area for K value detection according to the target preset temperature range to ensure the accuracy of the K value detection.

[0013] In some embodiments, the respectively detecting the K value of the battery in each test area includes: For each test area, the battery voltage is collected once when the battery enters the test area, and once when the battery moves out of the test area; the K value of the battery in the test area is calculated using the twice collected battery voltages.

[0014] In this embodiment, the K value of the battery in the test area is calculated by using the voltage of the battery when it enters the test area and the voltage when it moves out of the test area, so that the consistency of the K value detection of the battery in the test area can be ensured.

[0015] In some embodiments, the step of moving the battery from the target test area to the next test area adjacent to the target test area by the battery moving unit according to the real-time temperature dropping to a preset temperature interval corresponding to the next test area adjacent to the target test area comprises: At every preset time interval, using the real-time temperature to obtain a battery cooling rate; The moving speed of the battery moving unit in the target test area is adjusted according to the battery cooling rate, so that when the real-time temperature drops to a preset temperature range corresponding to the next test area, the battery is moved to the next test area.

[0016] In this embodiment, the battery movement speed in the test area is adjusted by using the real-time monitored battery cooling rate to ensure that the heat dissipation time of the battery in the test area can be dynamically adjusted, so that when the battery temperature drops to the preset temperature range corresponding to the next test area, the battery is automatically moved to the next test area.

[0017] In some embodiments, judging whether the battery has abnormal self-discharge according to the K value of the battery in each test area includes: The average K value of the battery is determined by using the K value in each test area and the correction coefficient corresponding to each test area; when the average K value exceeds a preset value, it is determined that the battery self-discharge is abnormal; when the average K value does not exceed the preset value, it is determined that the battery self-discharge is normal.

[0018] In this embodiment, taking into account that the K value of the battery will be significantly affected at different temperatures, an adaptive correction coefficient is set for each test area, so that the average K value of the battery is obtained by using the K value of each test area and the corresponding correction coefficient to ensure the consistency of the K value and achieve accurate detection of battery self-discharge.

[0019] In some embodiments, the method further comprises: Obtain a first K value of the experimental battery at room temperature; for each test area, heat the temperature of the experimental battery to a preset temperature range corresponding to the test area, and obtain a second K value of the experimental battery after heating; and use the first K value and the second K value to determine a correction coefficient corresponding to the test area.

[0020] In this embodiment, an experimental battery is used to obtain its K value at room temperature and its K value in a preset temperature range corresponding to the test area, so that the correction coefficient corresponding to the test area can be determined based on these two K values.

[0021] The second aspect of the present application proposes a battery self-discharge detection system, the system comprising: at least two test areas arranged adjacent to each other in sequence, at least one battery mobile unit and a processor; each test area corresponds to a different preset temperature interval, the preset temperature interval corresponding to each test area is a continuous interval, and the test areas corresponding to adjacent preset temperature intervals in the continuous interval are arranged adjacently; the battery mobile unit is arranged in each test area, and the battery mobile unit is used to transfer batteries between the test areas; the processor is used to execute the method described in the first aspect.

[0022] In some embodiments, the system further includes: a static zone, wherein the static zone is disposed adjacent to a test zone corresponding to the largest preset temperature range among the test zones.

[0023] In some embodiments, a refrigeration device is provided in the test area corresponding to the largest preset temperature range in each test area, and the refrigeration device is used to provide cold air inside the test area.

[0024] The third aspect of the present application provides a battery self-discharge detection device, the device comprising: An acquisition module, used to acquire the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area; A battery moving module, used for moving the battery to a corresponding test area through the battery moving unit according to a temperature matching result between a preset temperature range of each test area and the real-time temperature; A battery testing module, used to detect the K value of the battery in each test area respectively; The judging module is used to judge whether the self-discharge of the battery is abnormal according to the K value of the battery in each test area.

[0025] The fourth aspect of the present application proposes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the first aspect when executing the program.

[0026] The fifth aspect of the present application proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the first aspect above.

[0027] The sixth aspect of the present application proposes a computer program product, including a computer program, wherein the computer program is executed by a processor to implement the steps of the method described in the first aspect above.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 is a structural schematic diagram of a battery self-discharge detection system according to an exemplary embodiment; Figure 2 is a flow chart of a battery self-discharge detection method according to an exemplary embodiment; Figure 3 A schematic diagram of a battery transfer process according to an exemplary embodiment is shown; Figure 4 is a schematic structural diagram of a battery self-discharge detection device according to an exemplary embodiment; Figure 5 is a schematic diagram of a hardware structure of an electronic device according to an exemplary embodiment; Figure 6 The figure is a schematic diagram of the structure of a storage medium according to an exemplary embodiment. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0033] 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 application. The appearance of the phrase in various locations 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.

[0034] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0035] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0036] The self-discharge level of the battery will be significantly affected at different temperatures. Since high temperature will accelerate the internal chemical reaction of the battery, the self-discharge reaction rate inside the battery will increase, so when the temperature is high, the self-discharge rate of the battery will increase significantly. Specifically, the increase in temperature will accelerate the internal reaction between the positive and negative electrodes of the battery, causing the chemical composition inside the battery to gradually change, thereby affecting the self-discharge rate of the battery. For example, studies have shown that the self-discharge rate of lithium batteries increases by 10°C for every increase in temperature. In practical applications, batteries should be avoided from being stored in high temperature environments for a long time to reduce self-discharge and extend battery life.

[0037] In battery production and processing, high-temperature aging treatment is carried out before self-discharge detection, so the batteries are at a high temperature level. At this time, the batteries need to be put into storage for the next step of K value detection. However, due to production capacity planning and site space limitations, batteries with very high temperatures after high-temperature aging are usually mixed with normal temperature batteries that have undergone K value detection for a period of time in the same space, causing the normal temperature battery temperature to rise and the K value to fluctuate, resulting in low accuracy of self-discharge detection.

[0038] In order to solve the above technical problems, the present application proposes a battery self-discharge detection scheme, by setting at least two test areas in the test space, each test area corresponds to a different preset temperature range, so that in the process of the battery gradually dissipating heat from a relatively high temperature, the battery temperature is detected in real time, and according to the temperature matching result of the real-time temperature of the battery and the preset temperature range of each test area, the battery is automatically moved to the corresponding test area through the battery moving unit, and the K value of the battery in each test area needs to be detected separately. Since each test area corresponds to a preset temperature range, the battery can be moved to different test areas according to the real-time temperature of the battery for K value detection. The temperature difference between the batteries in the same test area is small, which can reduce the influence of the high-temperature battery on the K value of the normal temperature battery, and improve the accuracy of self-discharge detection. In addition, during the heat dissipation process of the battery, the K value of different temperature stages can be continuously obtained and an effective self-discharge abnormality judgment can be made, without the need to let the battery stand at room temperature for self-discharge detection, which can effectively shorten the battery standing time and improve the battery production rhythm.

[0039] The battery self-discharge detection scheme disclosed in the embodiment of the present application can be used, but not limited to, in the battery production process, and of course can also be used for self-discharge detection in the battery after-sales service process to provide effective battery performance detection.

[0040] It is understandable that the battery mentioned above can be a battery cell, a battery module or a battery pack, etc.

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0042] Figure 1 The present invention is a structural schematic diagram of a battery self-discharge detection system according to an exemplary embodiment, comprising: a test space 10, a battery moving unit 20 and a processor 30. In the test space 10, at least two test areas are arranged adjacent to each other in sequence, each test area corresponds to a different preset temperature interval, and the preset temperature intervals corresponding to each test area are continuous intervals. The test areas corresponding to adjacent preset temperature intervals in the continuous interval are arranged adjacently. The battery moving unit 20 is arranged in each test area, and the battery moving unit 20 is used to transfer batteries between the test areas.

[0043] The test space 10 can be understood as a site space for providing self-discharge detection for the battery. Each test area in the test space 10 can be understood as a static storage area for the battery, which is used to place batteries whose temperatures are in the corresponding preset temperature range, and the K value detection of the battery in the corresponding temperature range must also be implemented in the test area.

[0044] exist Figure 1 There are three test areas: a high temperature test area, a medium temperature test area, and a normal temperature test area. The three test areas are arranged adjacent to each other in sequence. The preset temperature interval corresponding to the high temperature test area is higher than the preset temperature interval corresponding to the medium temperature test area, and the preset temperature interval corresponding to the medium temperature test area is higher than the preset temperature interval corresponding to the normal temperature test area. In other words, the battery in the high temperature interval is located in the high temperature test area, the battery in the medium temperature interval is located in the medium temperature test area, and the battery in the normal temperature interval is located in the normal temperature test area.

[0045] It is worth explaining here that after the battery has undergone high-temperature aging treatment, the battery is at a relatively high temperature level and will gradually dissipate heat and cool down. Therefore, the temperature of the battery is in a dynamic change stage. By placing the battery in different test areas according to the preset temperature range, K value detection is carried out separately to achieve K value detection of the battery at different temperature stages.

[0046] The battery mobile unit 20 can be understood as a conveying chain device that runs through multiple test areas. Battery storage locations can be arranged on the battery mobile unit 20. After the battery is placed on the battery storage location on the battery mobile unit 20, the battery will move with the movement of the battery mobile unit 20, thereby realizing the transfer of the battery between multiple test areas.

[0047] The processor 30 is used to detect the temperature of the battery during the heat dissipation process. According to the temperature during the heat dissipation process and the preset temperature range corresponding to each test area, the battery is moved to each test area for K value detection, and according to the K value of the battery in each test area, it is determined whether the battery self-discharge is abnormal.

[0048] By applying the embodiment scheme of the present application, the test space is rationally allocated into at least two test areas which are arranged adjacent to each other in sequence, each test area corresponds to a different preset temperature interval, the preset temperature interval corresponding to each test area is a continuous interval, and the test areas corresponding to adjacent preset temperature intervals in the continuous interval are arranged adjacent to each other, thereby reducing the temperature difference between adjacent areas. Since the temperature difference between batteries in the same test area is small, the influence of high-temperature batteries on the K value of normal-temperature batteries can be reduced, thereby improving the accuracy of self-discharge detection.

[0049] In some embodiments, continuing as Figure 1 As shown, the self-discharge detection system may further include a resting area 40, which is disposed adjacent to a test area corresponding to the largest preset temperature range in each test area, that is, the resting area 40 is adjacent to the high-temperature test area. The resting area 40 is used to hold batteries whose temperature exceeds the preset temperature range corresponding to the high-temperature test area, and to move the batteries to the high-temperature test area when the temperature of the batteries drops to the preset temperature range corresponding to the high-temperature test area, so as to avoid the accuracy of the K value detection being affected by excessive battery temperature.

[0050] It is worth noting here that the battery mobile unit 20 is also located in the static area 40. When the temperature of the battery in the static area 40 drops to the maximum preset temperature range, the battery mobile unit 20 can automatically move the battery from the static area 40 to the test area corresponding to the maximum preset temperature range.

[0051] In some embodiments, continuing as Figure 1 As shown, a refrigeration device 50 can be provided in the test area corresponding to the largest preset temperature range in each test area. The refrigeration device 50 is used to provide cold air inside the test area to accelerate the heat dissipation speed of the high-temperature battery in the test area and reduce the heat dissipation time of the battery in the test area, thereby further shortening the battery standing time and improving the battery production rhythm.

[0052] In some embodiments, the processor 30 needs to detect the battery temperature and perform a K value test on the battery, so a temperature monitoring device for detecting the battery temperature and a voltage acquisition device for acquiring the battery voltage may be respectively provided in each test area.

[0053] In addition, a temperature monitoring device and a voltage collection device may be provided for each battery storage location on the battery mobile unit 20. The present application does not specifically limit the arrangement form of the temperature monitoring device and the voltage collection device.

[0054] Figure 2 This is a flow chart of an embodiment of a battery self-discharge detection method according to an exemplary embodiment of the present application. Figure 1 Based on the self-discharge detection system shown, the battery self-discharge detection method includes the following steps: Step 201: obtaining the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area; Step 202: according to the temperature matching result between the real-time temperature and the preset temperature range of each test area, the battery is moved to the corresponding test area by the battery moving unit; Step 203: Detect the K value of the battery in each test area respectively, and determine whether the battery has abnormal self-discharge according to the K value of the battery in each test area.

[0055] The heat dissipation process can be understood as the process of the battery temperature dropping from the first temperature range to the second temperature range. The first temperature range can be understood as a temperature range higher than the normal temperature environment, that is, the battery is heated to the first temperature range before the self-discharge detection, or the battery is in the first temperature range after the high-temperature aging is completed. Therefore, the battery in the first temperature range is a high-temperature battery.

[0056] Exemplarily, high temperature aging treatment refers to storing or charging and discharging the battery for a certain period of time in an environment higher than normal temperature (usually between 40°C and 60°C) to accelerate the chemical reaction and physical aging process of the battery, simulating the performance degradation of the battery during long-term use. It can be seen that the battery will be at a relatively high temperature level after being treated with high temperature aging, that is, it is a high-temperature battery. According to the normal production process, the battery self-discharge test is required at this time. In the existing scheme, the high-temperature battery is mixed with the normal-temperature battery that has been tested for K value for a period of time, and the self-discharge test is performed after the high-temperature battery is left to cool for a period of time.

[0057] The second temperature range can be understood as the temperature range of the normal temperature environment, that is, the battery reaches a stable normal temperature state after gradually dissipating heat from a high temperature state.

[0058] It can be seen that in order to complete the self-discharge detection in each test area during the battery heat dissipation process, the preset temperature intervals corresponding to each test area are all within the temperature interval formed by the lower limit value of the second temperature interval and the upper limit value of the first temperature interval.

[0059] It can be understood that the preset temperature intervals corresponding to the respective test areas are all located within a temperature interval formed by the lower limit value of the second temperature interval and the upper limit value of the first temperature interval.

[0060] The K value refers to the voltage change per unit time of the battery, which can reflect the self-discharge rate of the battery. The larger the K value of the battery, the greater the self-discharge rate. Therefore, the self-discharge detection of the battery can be achieved by detecting the K value of the battery.

[0061] Considering that the K value of the battery is greatly affected by the battery temperature, generally, the higher the battery temperature, the greater the K value. Each test area corresponds to a different preset temperature range. Therefore, the temperature difference of the battery in each test area is obvious, and the K value needs to be tested separately in each test area.

[0062] Self-discharge refers to the phenomenon that the battery power gradually decreases when there is no load. If the battery self-discharge is serious, the produced battery can be considered defective and needs to be reworked.

[0063] At this point, the above Figure 1 The battery self-discharge detection process shown in the figure, during the process of the battery gradually dissipating heat from a relatively high temperature, the battery temperature is detected in real time, and according to the temperature matching result of the real-time temperature of the battery and the preset temperature range of each test area, the battery is automatically moved to the corresponding test area through the battery moving unit, and the K value of the battery in each test area needs to be detected separately. Since each test area corresponds to a preset temperature range, the battery can be moved to different test areas according to the real-time temperature of the battery for K value detection. The temperature difference between batteries in the same test area is small, which can reduce the impact of high-temperature batteries on the K value of normal-temperature batteries and improve the accuracy of self-discharge detection. In addition, during the heat dissipation process of the battery, the K value of different temperature stages can be continuously obtained and an effective self-discharge abnormality judgment can be made, without the need to let the battery stand at room temperature for self-discharge detection, which can effectively shorten the battery standing time and improve the battery production rhythm.

[0064] In some embodiments, the above step 202 may include: When the real-time temperature is less than or equal to the maximum temperature in the continuous interval, determine the target preset temperature interval to which the real-time temperature belongs, and move the battery to the target test area corresponding to the target preset temperature interval through the battery moving unit; when the real-time temperature drops to the preset temperature interval corresponding to the next test area adjacent to the target test area, move the battery from the target test area to the next test area through the battery moving unit until the battery is moved to the test area corresponding to the smallest preset temperature interval in the continuous interval.

[0065] Since the preset temperature intervals corresponding to the adjacent test areas are gradually reduced, that is, the temperature interval corresponding to the first test area is higher than the temperature interval corresponding to the second test area, and so on. The battery temperature gradually decreases during the heat dissipation process. Therefore, when the battery temperature is within the continuous interval formed by these preset temperature intervals, the battery is first transported to the target test area corresponding to the target preset temperature interval to which the battery temperature belongs. Then, during the heat dissipation process, the temperature gradually decreases and the battery is moved from the target test area to the next test area in sequence until the last test area.

[0066] It is worth noting that the target test area that the battery first enters may be any one of the test areas, and it needs to be determined based on the target preset temperature range to which its temperature matches.

[0067] For example, as mentioned above Figure 1 As shown, it is assumed that the battery is first transported to the high temperature test area for K value detection, then transferred to the medium temperature test area for K value detection, and finally transferred to the normal temperature test area for K value detection.

[0068] In this embodiment, since the preset temperature intervals corresponding to the respective test areas are continuous intervals, and the test areas of any two adjacent preset temperature intervals are arranged adjacent to each other, during the battery heat dissipation process, first when the battery temperature is less than or equal to the maximum temperature in the continuous interval, the battery is first moved to the target test area corresponding to the target preset temperature interval, and then the battery can be transferred from the target test area to the last test area in sequence according to the temperature change. In this way, the battery completes a K value test each time it passes through a test area, thereby ensuring the continuity of the battery K value test.

[0069] In some embodiments, based on the above step 202, the following steps may also be included: When the real-time temperature is greater than the maximum temperature in the continuous interval, the battery is moved to the static area by the battery moving unit for static placement, and then when the real-time temperature is less than or equal to the maximum temperature in the continuous interval, the step of determining the target preset temperature interval to which the real-time temperature belongs is performed.

[0070] That is to say, if the initial temperature of the battery is not within the continuous range formed by these preset temperature ranges, it means that the initial temperature of the battery is too high, the K value detection is inaccurate, and it is not suitable to be placed in the test area for K value detection.

[0071] For example, assuming that the maximum preset temperature range is 35°C -45°C, which is the temperature range corresponding to the first test area, the initial temperature of the battery is 55°C, indicating that the temperature of the battery is too high and is not suitable for directly entering the test area for K value detection. Therefore, the battery is first transferred to the static area and left to stand for a period of time. When the temperature of the battery drops to between 35°C -45°C, the battery is transferred from the static area to the first test area.

[0072] It is understandable that batteries are usually subjected to high-temperature aging treatment in batches, that is, a batch of batteries is produced after each high-temperature aging treatment. Among a batch of batteries, the temperature of some batteries may be within the preset temperature range corresponding to the first test area, and the temperature of some batteries may be too high and not within the preset temperature range corresponding to the first test area. Therefore, the batteries whose temperature is within the preset temperature range corresponding to the first test area are directly transferred to the first test area to start K value detection. The batteries whose temperature is not within the preset temperature range corresponding to the first test area are first transferred to the static area for cooling, and can enter the first test area together with the next batch of batteries.

[0073] In this embodiment, during the heat dissipation process of the battery, if the battery temperature is initially higher than the preset temperature range corresponding to each test area, it means that the battery temperature is too high and is not suitable for K value detection. The battery is moved to a static area for static use, and after the temperature drops, it is moved to the target test area for K value detection according to the target preset temperature range to ensure the accuracy of the K value detection.

[0074] In some embodiments, the above step 202 may include: For each test area, the battery voltage is collected once when the battery enters the test area, and once when the battery moves out of the test area, and then the K value of the battery in the test area is calculated using the twice collected battery voltages.

[0075] The battery voltage can be collected twice at fixed positions in the test area to ensure the consistency of the K value detection of the battery in the test area, for example, the battery voltage can be collected at the entrance and exit of the test area respectively.

[0076] It is understandable that, since the calculation of the K value also requires the interval time between two battery voltages, when collecting the battery voltage, the collection time is recorded to facilitate the calculation of the interval time.

[0077] In this embodiment, the K value of the battery in the test area is calculated by using the voltage of the battery when it enters the test area and the voltage when it moves out of the test area, so that the consistency of the K value detection of the battery in the test area can be ensured.

[0078] In some embodiments, according to the real-time temperature dropping to a preset temperature interval corresponding to the next test zone adjacent to the target test zone, the process of moving the battery from the target test zone to the next test zone by the battery moving unit may include: At preset time intervals, the battery cooling rate is obtained using the real-time temperature; the moving speed of the battery mobile unit in the target test area is adjusted according to the battery cooling rate, so that when the real-time temperature drops to the preset temperature range corresponding to the next test area, the battery is moved to the next test area.

[0079] The preset time interval can be understood as a time interval for adjusting the battery moving speed, and the time interval can be set according to practical experience, for example, 10 minutes.

[0080] The battery cooling rate refers to the temperature drop of the battery per unit time. Affected by the surrounding environment in the test area, the battery temperature change is nonlinear, so the battery cooling rate changes dynamically.

[0081] The moving speed of the battery determines the length of time it remains stationary in the test area. By using the battery cooling rate to adjust the moving speed, the length of time the battery remains stationary in the test area can be adjusted, thereby achieving a gradual transfer of the battery between test areas.

[0082] The moving speed of the battery in the current test area is adjusted according to the battery cooling rate. The specific method is: when the battery cooling rate is greater than the preset cooling rate, the moving speed of the battery can be increased, and when the battery cooling rate is less than the preset cooling rate, the moving speed of the battery can be reduced. In addition, the moving speed of the battery can also be adjusted according to the battery cooling rate combined with the difference between the battery temperature and the preset temperature range of the next test area, that is, when the difference with the preset temperature range of the next test area is relatively small, the moving speed of the battery can also be increased. Among them, the preset cooling rate can be set according to practical experience, and each test area can be set with a different cooling rate, and of course, it can also be set with the same cooling rate. This application does not make specific restrictions on this.

[0083] In this embodiment, the battery movement speed in the test area is adjusted by using the real-time monitored battery cooling rate to ensure that the heat dissipation time of the battery in the test area can be dynamically adjusted, so that when the battery temperature drops to the preset temperature range corresponding to the next test area, the battery is automatically moved to the next test area.

[0084] It should be noted that in addition to the above strategy of using the battery cooling rate combined with the battery movement speed adjustment to determine the battery transfer, the battery transfer can also be determined by a strategy of real-time monitoring whether the battery temperature drops to the preset temperature range corresponding to the next test area.

[0085] In some embodiments, the above step 203 may include: The average K value of the battery is determined by using the K value in each test area and the correction coefficient corresponding to each test area. When the average K value exceeds the preset value, the battery self-discharge is determined to be abnormal. When the average K value does not exceed the preset value, the battery self-discharge is determined to be normal.

[0086] The correction coefficient can be understood as a correction factor used to correct the K value of the preset temperature range corresponding to the test area to the K value at room temperature to ensure the consistency of the K value of each test area. Since each test area corresponds to a different temperature range, each test area corresponds to a different correction coefficient.

[0087] The average K value refers to the corrected average value of the K values ​​in each test area, and the average K value can characterize the self-discharge rate of the battery at room temperature.

[0088] The calculation formula of the average K value can be as follows:

[0089] in, , … Indicates the correction coefficient corresponding to each test area. , … represents the K value detected in each test area, and n represents the number of test areas.

[0090] The preset value can be understood as the minimum K value requirement for a battery to be identified as a defective product. The preset value can be set according to the self-discharge detection requirements. Batteries that fail the self-discharge detection can be filtered out through the preset value.

[0091] In this embodiment, taking into account that the K value of the battery will be significantly affected at different temperatures, an adaptive correction coefficient is set for each test area, so that the average K value of the battery is obtained by using the K value of each test area and the corresponding correction coefficient to ensure the consistency of the K value and achieve accurate detection of battery self-discharge.

[0092] In some embodiments, the battery self-discharge detection method may further include a process for determining a correction coefficient for each test area, the process being as follows: Obtain a first K value of the experimental battery at room temperature, heat the temperature of the experimental battery to a preset temperature range corresponding to each test area, obtain a second K value of the experimental battery after heating, and use the first K value and the second K value to determine the correction coefficient corresponding to the test area.

[0093] The normal temperature state can be understood as a normal temperature environment, such as 25° C., that is, the experimental battery is placed at normal temperature to measure the first K value.

[0094] The second K value is the K value measured when the experimental battery is placed in an environment of a temperature range corresponding to the test area.

[0095] The correction factor is calculated as follows:

[0096] In this embodiment, an experimental battery is used to obtain its K value at room temperature and its K value in a preset temperature range corresponding to the test area, so that the correction coefficient corresponding to the test area can be determined based on these two K values.

[0097] Based on the description of the above embodiment, taking the test space including a high temperature test area, a medium temperature test area and a normal temperature test area as an example, the specific implementation process of the battery transfer is described below.

[0098] Figure 3 The figure is a schematic diagram of a battery transfer process according to an exemplary embodiment, comprising the following steps: First, measure the temperature of the battery after high-temperature aging treatment. If the temperature difference with the maximum value in the temperature range of the high-temperature test area is within ±3°C, enter the high-temperature test area for cooling treatment with circulating cooling air. If the temperature difference with the maximum value in the temperature range of the high-temperature test area is not within ±3°C, put the battery into the static area for temporary storage. At this time, do not perform K value detection. Wait until the temperature of the battery drops to the temperature range of the high-temperature test area before transferring the battery to the high-temperature test area. Secondly, after the battery is transferred to the high-temperature test area, K value detection and temperature detection are carried out, and the temperature is compared with the temperature range of the medium-temperature test area at fixed intervals. If the compared temperature difference is within ±3°C, the battery is transferred to the medium-temperature test area for K value detection and temperature detection at the same time, otherwise, the temperature detection continues in the high-temperature test area; after the battery is transferred to the medium-temperature test area, the temperature is also compared with the temperature range of the normal temperature test area at fixed intervals. If the compared temperature difference is within ±3°C, the battery is transferred to the normal temperature test area for K value detection and temperature detection at the same time, otherwise, the temperature detection continues in the medium temperature test area; the last K value detection is completed after the battery is transferred to the normal temperature test area.

[0099] Finally, after completing the K value detection in the three test areas, the self-discharge abnormality judgment is carried out.

[0100] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0101] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0102] Corresponding to the above-mentioned embodiment of the battery self-discharge detection method, the present application also provides an embodiment of a battery self-discharge detection device.

[0103] Figure 4: is a schematic diagram of a battery self-discharge detection device according to an exemplary embodiment of the present application, the device is used to execute the battery self-discharge detection method provided in any of the above embodiments, such as Figure 4 As shown, the battery self-discharge detection device comprises: An acquisition module 410 is used to acquire the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to the test areas; A battery moving module 420, configured to move the battery to a corresponding test area through the battery moving unit according to a temperature matching result between a preset temperature range of each test area and the real-time temperature; A battery testing module 430, used to detect the K value of the battery in each test area respectively; The judgment module 440 is used to judge whether the self-discharge of the battery is abnormal according to the K value of the battery in each test area.

[0104] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0105] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0106] The embodiment of the present application further provides an electronic device corresponding to the battery self-discharge detection method provided in the above embodiment, so as to execute the above battery self-discharge detection method.

[0107] Figure 5 This is a hardware structure diagram of an electronic device according to an exemplary embodiment of the present application, and the electronic device may include: a communication interface 601, a processor 602, a memory 603 and a bus 604; wherein the communication interface 601, the processor 602 and the memory 603 complete mutual communication through the bus 604. The processor 602 can execute the battery self-discharge detection method described above by reading and executing the machine executable instructions corresponding to the control logic of the battery self-discharge detection method in the memory 603. The specific content of the method is referred to the above embodiment, and will not be repeated here.

[0108] The memory 603 mentioned in this application can be any electronic, magnetic, optical or other physical storage device, and can contain storage information, such as executable instructions, data, etc. Specifically, the memory 603 can be RAM (Random Access Memory), flash memory, storage drive (such as hard disk drive), any type of storage disk (such as optical disk, DVD, etc.), or similar storage medium, or a combination thereof. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 601 (which can be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. can be used.

[0109] The bus 604 may be an ISA bus, a PCI bus or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 603 is used to store programs, and the processor 602 executes the programs after receiving execution instructions.

[0110] The processor 602 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 602. The above processor 602 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be combined and executed.

[0111] The electronic device provided in the embodiment of the present application and the battery self-discharge detection method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, operated or implemented therein.

[0112] The present application also provides a computer-readable storage medium corresponding to the battery self-discharge detection method provided in the above embodiment. Figure 6 As shown, the computer-readable storage medium shown is a CD 30 on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, the battery self-discharge detection method provided in any of the aforementioned embodiments will be executed.

[0113] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0114] The computer-readable storage medium provided in the above-mentioned embodiment of the present application and the battery self-discharge detection method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the method adopted, run or implemented by the application program stored therein.

[0115] The embodiments of the present application further provide a computer program product corresponding to the battery self-discharge detection method provided in the aforementioned embodiments, including a computer program, which is executed by a processor to implement the battery self-discharge detection method provided in any of the aforementioned embodiments.

[0116] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0117] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0118] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery self-discharge detection method, characterized in that: Applied to a battery self-discharge detection system, the system includes at least two test areas and at least one battery mobile unit, the preset temperature intervals corresponding to the test areas are continuous intervals, and the test areas corresponding to adjacent preset temperature intervals in the continuous interval are arranged adjacently, and the method includes: Obtaining the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area; According to the temperature matching result between the preset temperature range of each test area and the real-time temperature, the battery is moved to the corresponding test area by the battery moving unit; Respectively detecting the K value of the battery in each test area; Whether the battery has abnormal self-discharge is determined according to the K value of the battery in each test area.

2. The method according to claim 1, characterized in that The step of moving the battery to the corresponding test area by the battery moving unit according to the temperature matching result between the preset temperature range of each test area and the real-time temperature includes: When the real-time temperature is less than or equal to the maximum temperature in the continuous interval, determining the target preset temperature interval to which the real-time temperature belongs, and moving the battery to the target test area corresponding to the target preset temperature interval by the battery moving unit; According to the real-time temperature dropping to the preset temperature interval corresponding to the next test area adjacent to the target test area, the battery is moved from the target test area to the next test area by the battery moving unit until the battery is moved to the test area corresponding to the smallest preset temperature interval in the continuous interval.

3. The method according to claim 2, characterized in that The system further includes a static zone adjacent to a test zone corresponding to the largest preset temperature interval among the test zones, and the method further includes: When the real-time temperature is greater than the maximum temperature in the continuous interval, the battery is moved to the static area by the battery moving unit for static placement, and then when the real-time temperature is less than or equal to the maximum temperature in the continuous interval, the step of determining the target preset temperature interval to which the real-time temperature belongs is performed.

4. The method according to claim 2, characterized in that: The step of moving the battery from the target test area to the next test area adjacent to the target test area by the battery moving unit according to the real-time temperature dropping to a preset temperature interval corresponding to the next test area adjacent to the target test area comprises: At every preset time interval, using the real-time temperature to obtain a battery cooling rate; The moving speed of the battery moving unit in the target test area is adjusted according to the battery cooling rate, so that when the real-time temperature drops to a preset temperature range corresponding to the next test area, the battery is moved to the next test area.

5. The method according to claim 1, characterized in that The respectively detecting the K value of the battery in each test area comprises: For each test area, collecting the battery voltage once when the battery enters the test area, and collecting the battery voltage once when the battery moves out of the test area; The K value of the battery in the test area is calculated using the battery voltages collected twice.

6. The method according to claim 1, characterized in that The step of judging whether the battery has abnormal self-discharge according to the K value of the battery in each test area includes: Determine the average K value of the battery by using the K value in each test area and the correction coefficient corresponding to each test area; When the average K value exceeds a preset value, determining that the battery self-discharge is abnormal; When the average K value does not exceed a preset value, it is determined that the battery self-discharge is normal.

7. The method according to claim 6, characterized in that The method further comprises: Obtain the first K value of the experimental battery at room temperature; For each test area, heating the temperature of the experimental battery to a preset temperature range corresponding to the test area, and obtaining a second K value of the experimental battery after heating; The correction coefficient corresponding to the test area is determined using the first K value and the second K value.

8. A battery self-discharge detection system, characterized in that: The system comprises: at least two test areas arranged adjacent to each other in sequence, at least one battery moving unit and a processor; Each test area corresponds to a different preset temperature interval, and the preset temperature intervals corresponding to each test area are continuous intervals, and the test areas corresponding to adjacent preset temperature intervals in the continuous interval are arranged adjacently; The battery moving unit is arranged in each test area, and the battery moving unit is used to transfer batteries between the test areas; The processor is configured to execute the method according to any one of claims 1 to 7.

9. The system according to claim 8, characterized in that The system further comprises: a static zone, which is arranged adjacent to a test zone corresponding to the largest preset temperature range among the test zones.

10. The system according to claim 8, characterized in that A refrigeration device is provided in the test area corresponding to the largest preset temperature range in each test area, and the refrigeration device is used to provide cold air inside the test area.

11. A battery self-discharge detection device, characterized in that: include: An acquisition module, used to acquire the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area; A battery moving module, used for moving the battery to a corresponding test area through the battery moving unit according to a temperature matching result between a preset temperature range of each test area and the real-time temperature; A battery testing module, used to detect the K value of the battery in each test area respectively; The judging module is used to judge whether the self-discharge of the battery is abnormal according to the K value of the battery in each test area.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

14. A computer program product comprising a computer program, characterized in that The computer program is executed by a processor to implement the steps of the method according to any one of claims 1 to 7.

Images