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

Abstract

The present application discloses a battery self-discharge detection method, system, device, equipment, medium and product, relating to the technical field of batteries. The method includes: obtaining the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges respectively corresponding to each test area; moving the battery to the corresponding test area through the battery moving unit according to the temperature matching result between the preset temperature ranges of each test area and the real-time temperature; respectively detecting the K value of the battery in each test area; and judging whether the battery has abnormal self-discharge according to the K value of the battery in each test area. Since each test area corresponds to a different temperature range, the temperature difference between batteries in the same test area is small, thereby reducing the influence of high-temperature batteries on the K value of normal-temperature batteries and improving the accuracy of self-discharge detection.

Description

Technical Field

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

[0002] A battery is composed of a positive electrode, a negative electrode, a separator and an electrolyte, etc. Due to the possible existence of 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 has a certain degree of self-discharge. In order to ensure that the battery quality meets the requirements, it is necessary to detect the self-discharge of the battery.

[0003] Since high temperature will accelerate the self-discharge reaction rate of the battery, in related technologies, usually before detecting the self-discharge of the battery, the battery is first subjected to high-temperature aging, and then the K value of the battery is detected, that is, the voltage drop of the battery per unit time is detected, and based on the K value of the battery, it is judged whether there is an abnormal self-discharge of the battery.

[0004] However, in related technologies, due to production capacity planning and site space limitations, usually the batteries with very high temperature after high-temperature aging and the normal-temperature batteries that have been subjected to K value detection for a period of time are mixed in the same space, resulting in an increase in the temperature of the normal-temperature batteries and fluctuations in the K value, thus making the accuracy of self-discharge detection not high.

[0005] The above statements are only used to provide background technical 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 method, system, device, equipment, medium and product for detecting self-discharge of batteries to solve the problem that the existing mixing of batteries at different temperatures together leads to inaccurate self-discharge detection.

[0007] A first aspect of the present application proposes a method for detecting self-discharge of batteries, which is applied to a battery self-discharge detection system. The system includes at least two test areas and at least one battery moving unit. The preset temperature ranges corresponding to each test area are continuous ranges, and the test areas corresponding to adjacent preset temperature ranges in the continuous range are arranged adjacent to each other. The method includes:

[0008] Obtain the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area;

[0009] According to the temperature matching result between the preset temperature range of each test area and the real-time temperature, move the battery to the corresponding test area through the battery moving unit;

[0010] Detect the K value of the battery in each test area respectively;

[0011] Based on the K value of the battery in each test area, it is determined whether the battery has abnormal self-discharge.

[0012] In the technical solution of the embodiment of the present application, by setting at least two test areas and a battery moving unit, and each test area corresponds to a preset temperature range, and the test areas corresponding to adjacent preset temperature ranges are arranged adjacent to each other. Thus, during the process of the battery gradually dissipating heat from a relatively high temperature, by detecting the temperature of the battery in real time, and according to the temperature matching result between the real-time temperature of the battery and the preset temperature ranges of each test area, the battery is automatically moved to the corresponding test area by the battery moving unit. And it is necessary to detect the K value of the battery in each test area respectively. Since each test area corresponds to a preset temperature range respectively, the battery can be moved to different test areas according to the real-time temperature of the battery for K value detection respectively. The temperature difference between the batteries in the same test area is small, which can reduce the influence of high-temperature batteries on the K value of normal-temperature batteries and improve the accuracy of self-discharge detection. And during the process of the battery dissipating heat, the K values at different temperature stages can be continuously obtained and an effective judgment of abnormal self-discharge can be made, without having to let the battery stand still to room temperature for self-discharge detection, which can effectively shorten the battery standing time and improve the battery production rhythm.

[0013] In some embodiments, the moving the battery to the corresponding test area by the battery moving unit according to the temperature matching result between the preset temperature ranges of each test area and the real-time temperature includes:

[0014] When the real-time temperature is less than or equal to the maximum temperature in the continuous range, determine the target preset temperature range to which the real-time temperature belongs, and move the battery to the target test area corresponding to the target preset temperature range by the battery moving unit; according to the real-time temperature dropping to the preset temperature range 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 by the battery moving unit until the battery is moved to the test area corresponding to the smallest preset temperature range in the continuous range.

[0015] In this embodiment, since the preset temperature ranges corresponding to each test area are continuous ranges, and the test areas corresponding to any two adjacent preset temperature ranges are arranged adjacent to each other. Thus, during the process of the battery dissipating heat, first, when the battery temperature is less than or equal to the maximum temperature in the continuous range, the battery is first moved to the target test area corresponding to the target preset temperature range to which it belongs. Then, according to the change of temperature, the battery can be sequentially transferred from the target test area to the last test area. In this way, the battery completes a K value detection every time it passes through a test area, which can ensure the continuity of the battery K value detection.

[0016] In some embodiments, the system further includes a standing area adjacent to the test area corresponding to the largest preset temperature range among the test areas, and the method further includes:

[0017] When the real-time temperature is greater than the maximum temperature in the continuous range, the battery is moved to the standing area by the battery moving unit for standing, and then the step of determining the target preset temperature range to which the real-time temperature belongs is performed when the real-time temperature is less than or equal to the maximum temperature in the continuous range.

[0018] 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 at this time and is not suitable for K value detection. By moving the battery to the standing area for standing, after the temperature drops, it is moved to the target test area for K value detection according to the target preset temperature range to which it belongs, ensuring the accuracy of K value detection.

[0019] In some embodiments, the separately detecting the K value of the battery in each test area includes:

[0020] For each test area, the battery voltage is collected once when the battery enters the test area and once when the battery exits the test area; the K value of the battery in the test area is calculated using the battery voltages collected twice.

[0021] In this embodiment, by calculating the K value of the battery in the test area using the voltage when the battery enters the test area and the voltage when the battery exits the test area, the consistency of K value detection of the battery in the test area can be ensured.

[0022] In some embodiments, the moving the battery from the target test area to the next test area by the battery moving unit according to the real-time temperature dropping to the preset temperature range corresponding to the next test area adjacent to the target test area includes:

[0023] At every preset time interval, the battery cooling rate is obtained using the real-time temperature;

[0024] According to the battery cooling rate, the moving speed of the battery moving unit in the target test area is adjusted so that when the real-time temperature drops to within the preset temperature range corresponding to the next test area, the battery is moved to the next test area.

[0025] In this embodiment, by using the real-time monitored battery cooling rate to adjust the moving speed of the battery in the test area, the heat dissipation time of the battery in the test area can be dynamically adjusted to ensure that when the temperature of the battery drops to within the preset temperature range corresponding to the next test area, the battery also automatically moves to the next test area.

[0026] In some embodiments, determining whether the battery has abnormal self-discharge according to the K value of the battery in each test area includes:

[0027] Using the K value in each test area and the correction coefficient corresponding to each test area to determine the average K value of the battery; when the average K value exceeds a preset value, determining that the battery has abnormal self-discharge; when the average K value does not exceed the preset value, determining that the battery has normal self-discharge.

[0028] In this embodiment, considering that the K value of the battery is significantly affected at different temperatures, by setting an appropriate correction coefficient for each test area respectively, the average K value of the battery is obtained by using the K value in each test area and the corresponding correction coefficient, so as to ensure the consistency of the K value and achieve accurate detection of the battery self-discharge.

[0029] In some embodiments, the method further includes:

[0030] Obtaining a first K value of the experimental battery at room temperature; for each test area, heating the temperature of the experimental battery to the corresponding preset temperature range of the test area, and obtaining a second K value of the experimental battery after heating; using the first K value and the second K value to determine the correction coefficient corresponding to the test area.

[0031] In this embodiment, by using an experimental battery, the K value at room temperature and the K value in the corresponding preset temperature range of the test area are obtained respectively, and the correction coefficient corresponding to the test area can be determined according to these two K values.

[0032] A second aspect of the present application provides a battery self-discharge detection system, the system includes: 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 range, and the preset temperature ranges corresponding to each test area are continuous ranges, and the test areas corresponding to the adjacent preset temperature ranges in the continuous range are arranged adjacent to each other; the battery moving unit is arranged in each test area, and the battery moving unit is used to transfer the battery between each test area; the processor is used to execute the method described in the first aspect.

[0033] In some embodiments, the system further includes: a static area, and the static area is arranged adjacent to the test area corresponding to the largest preset temperature range among each test area.

[0034] In some embodiments, a refrigeration device is arranged in the test area corresponding to the largest preset temperature range among each test area, and the refrigeration device is used to provide cold air inside the test area.

[0035] A third aspect of the present application provides a battery self-discharge detection device, which includes:

[0036] An acquisition module, configured to acquire the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to the respective test areas;

[0037] A battery movement module, configured to move the battery to the corresponding test area through the battery movement unit according to the temperature matching result between the preset temperature ranges of the respective test areas and the real-time temperature;

[0038] A battery test module, configured to respectively detect the K value of the battery in the respective test areas;

[0039] A judgment module, configured to judge whether the battery has abnormal self-discharge according to the K value of the battery in the respective test areas.

[0040] A fourth aspect of the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the method described in the first aspect above are implemented.

[0041] A fifth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method described in the first aspect above are implemented.

[0042] A sixth aspect of the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect above are implemented.

[0043] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0045] Figure 1 FIG. is a schematic structural diagram of a battery self-discharge detection system shown according to an exemplary embodiment;

[0046] Figure 2 FIG. is a flowchart of a battery self-discharge detection method shown according to an exemplary embodiment;

[0047] Figure 3 Schematic diagram of a battery transfer process shown according to an exemplary embodiment;

[0048] Figure 4 Schematic diagram of the structure of a battery self-discharge detection device shown according to an exemplary embodiment;

[0049] Figure 5 Schematic diagram of the hardware structure of an electronic device shown according to an exemplary embodiment;

[0050] Figure 6 Schematic diagram of the structure of a storage medium shown according to an exemplary embodiment. Detailed implementation manners

[0051] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality" means more than two unless otherwise specifically defined.

[0054] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, 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.

[0056] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0057] At different temperatures, the self-discharge level of the battery will be significantly affected. Since high temperature will accelerate the chemical reactions inside the battery, making the self-discharge reaction rate inside the battery increase, when the temperature is relatively 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, resulting in a gradual change in the chemical composition inside the battery, thereby affecting the self-discharge rate of the battery. For example, studies have shown that for lithium batteries, when the temperature increases by 10 °C, the self-discharge rate doubles. In practical applications, the battery should be avoided from being stored in a high-temperature environment for a long time to reduce self-discharge and extend the battery life.

[0058] During the production and processing of the battery, before the self-discharge detection, high-temperature aging treatment is carried out first, so the batteries taken out of the furnace are at a high temperature level. At this time, the batteries need to be stored in the warehouse for the next K-value detection. However, due to production capacity planning and site space limitations, usually, the batteries with a very high temperature after high-temperature aging are mixed with the normal-temperature batteries that have undergone the K-value detection for a certain period of time in the same space, resulting in an increase in the temperature of the normal-temperature batteries and fluctuations in the K value, thereby making the accuracy of the self-discharge detection not high.

[0059] To solve the above technical problems, the present application proposes a battery self-discharge detection solution. By setting at least two test areas in the test space, each test area corresponding to a different preset temperature range, during the process of the battery gradually dissipating heat from a relatively high temperature, by detecting the temperature of the battery in real time and according to the temperature matching result between the real-time temperature of the battery and the preset temperature ranges of each test area, the battery is automatically moved to the corresponding test area by the battery moving unit. And it is necessary to detect the K value of the battery in each test area respectively. Since each test area corresponds to a preset temperature range, the battery can be moved to different test areas for K value detection according to the real-time temperature of the battery. The temperature difference between the batteries in the same test area is small, which can reduce the influence of high-temperature batteries on the K value of normal-temperature batteries and improve the accuracy of self-discharge detection. And during the heat dissipation process of the battery, the K values at different temperature stages can be continuously obtained and an effective self-discharge abnormality judgment can be made, without having to let the battery stand still at normal temperature for self-discharge detection, which can effectively shorten the battery standing time and improve the battery production rhythm.

[0060] The battery self-discharge detection solution disclosed in the embodiments of the present application can be used, but is not limited to, the battery production process. Of course, it can also be used for self-discharge detection during the after-sales service process of the battery to provide an effective battery performance detection.

[0061] It can be understood that the above-mentioned battery can be a battery cell, a battery module or a battery pack, etc.

[0062] To enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.

[0063] Figure 1 FIG. 13 is a schematic structural diagram of a battery self-discharge detection system shown according to an exemplary embodiment, including: 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 range, and the preset temperature ranges corresponding to each test area are continuous ranges. In the continuous range, the test areas corresponding to adjacent preset temperature ranges are arranged adjacent to each other. The battery moving unit 20 is arranged in each test area, and the battery moving unit 20 is used to transfer the battery between each test area.

[0064] 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 location area for the battery, used to place the battery with a temperature in the corresponding preset temperature range, and the K value detection of the battery in the corresponding temperature range also needs to be realized in the test area.

[0065] In Figure 1Three test areas are shown: a high-temperature test area, a medium-temperature test area, and a normal-temperature test area. These three test areas are arranged adjacent to each other in sequence. The preset temperature range corresponding to the high-temperature test area is higher than the preset temperature range corresponding to the medium-temperature test area, and the preset temperature range corresponding to the medium-temperature test area is higher than the preset temperature range corresponding to the normal-temperature test area. That is to say, the battery in the high-temperature range is located in the high-temperature test area, the battery in the medium-temperature range is located in the medium-temperature test area, and the battery in the normal-temperature range is located in the normal-temperature test area.

[0066] It should be noted here that after the battery undergoes 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 for K-value detection according to the different preset temperature ranges where the battery temperature is located, the K-value detection of the battery at different temperature stages is realized.

[0067] The battery moving unit 20 can be understood as a conveyor chain device that runs through multiple test areas. Battery storage positions can be arranged on the battery moving unit 20. After the battery is placed on the battery storage position on the battery moving unit 20, the battery will move together with the movement of the battery moving unit 20, so as to realize the transfer of the battery between multiple test areas.

[0068] The processor 30 is used to detect the temperature during the heat dissipation process of the battery, move the battery to each test area for K-value detection according to the temperature during the heat dissipation process and the preset temperature ranges respectively corresponding to each test area, and judge whether the battery has abnormal self-discharge according to the K-value of the battery in each test area.

[0069] Applying the solution of the embodiment of the present application, the test space is reasonably divided into at least two test areas arranged adjacent to each other in sequence. Each test area corresponds to a different preset temperature range, and the preset temperature ranges respectively corresponding to each test area are continuous ranges. And the test areas corresponding to the adjacent preset temperature ranges in the continuous range are arranged adjacent to each other, reducing the temperature difference between adjacent areas. Since 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 accuracy of self-discharge detection can be improved.

[0070] In some embodiments, continuing as Figure 1 shown, the self-discharge detection system may further include a static area 40. The static area 40 is arranged adjacent to the test area corresponding to the largest preset temperature range among each test area, that is, the static area 40 is adjacent to the high-temperature test area. The static area 40 is used to hold the battery whose temperature exceeds the preset temperature range corresponding to the high-temperature test area, and move the battery to the high-temperature test area after the temperature of the battery drops to within the preset temperature range corresponding to the high-temperature test area, so as to avoid the influence of the too high battery temperature on the accuracy of K-value detection.

[0071] It should be noted here that the battery moving unit 20 is also located in the static area 40. After the temperature of the battery in the static area 40 drops to within the maximum preset temperature range, the battery moving unit 20 can automatically move the battery from the static area 40 to the test area corresponding to the maximum preset temperature range.

[0072] In some embodiments, continuing as Figure 1 shown, a refrigeration device 50 may be provided in the test area corresponding to the maximum 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 rate 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 static time and improving the battery production beat.

[0073] In some embodiments, the processor 30 needs to detect the battery temperature and perform K-value detection on the battery. Therefore, a temperature monitoring device for detecting the battery temperature and a voltage acquisition device for collecting the battery voltage may be respectively provided in each test area.

[0074] In addition, temperature monitoring devices and voltage acquisition devices may be provided for each battery storage location on the battery moving unit 20. The present application does not specifically limit the setting forms of the temperature monitoring device and the voltage acquisition device.

[0075] Figure 2 This is a flowchart of an embodiment of a battery self-discharge detection method shown according to an exemplary embodiment of the present application. Based on the above Figure 1 shown self-discharge detection system, the battery self-discharge detection method includes the following steps:

[0076] Step 201: Obtain the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area;

[0077] Step 202: According to the temperature matching result of the real-time temperature and the preset temperature ranges of each test area, move the battery to the corresponding test area through the battery moving unit;

[0078] Step 203: Detect the K value of the battery in each test area respectively, and judge whether the battery has abnormal self-discharge according to the K value of the battery in each test area.

[0079] The heat dissipation process can be understood as the process in which the temperature of the battery drops from the first temperature range to the second temperature range. The first temperature range can be understood as the temperature range higher than the normal temperature environment, that is, before the self-discharge detection, the battery is first heated to the first temperature range, or after the battery is subjected to high-temperature aging, the battery is in the first temperature range. Therefore, the battery located in the first temperature range belongs to the high-temperature battery.

[0080] Exemplarily, the high-temperature aging treatment refers to storing or performing charge and discharge tests on the battery in an environment above normal temperature (usually between 40°C and 60°C) for a certain period of time to accelerate the chemical reactions and physical aging processes of the battery and simulate the performance degradation of the battery during long-term use. It can be seen that after the battery comes out of the high-temperature aging treatment furnace, it will be at a relatively high temperature level, that is, it belongs to a high-temperature battery. According to the normal production process, at this time, the self-discharge detection of the battery needs to be carried out. In the existing solution, the high-temperature battery is mixed with the normal-temperature battery that has been subjected to the K-value detection for a period of time, and the self-discharge detection is carried out after the high-temperature battery is left to stand and dissipate heat for a period of time.

[0081] The second temperature range can be understood as the temperature range of the normal-temperature environment, that is, a stable normal-temperature state that the battery reaches after gradually dissipating heat from a high-temperature state.

[0082] 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 ranges corresponding to each test area are all within the temperature range formed by the lower limit value of the second temperature range and the upper limit value of the first temperature range.

[0083] It can be understood that the preset temperature ranges corresponding to each test area are all within the temperature range formed by the lower limit value of the second temperature range and the upper limit value of the first temperature range.

[0084] The K value refers to the voltage change amount of the battery per unit time, 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 realized by detecting the K value of the battery.

[0085] Considering that the K value of the battery is greatly affected by the battery temperature. Usually, the higher the battery temperature, the larger the K value. And 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 detection needs to be carried out separately in each test area.

[0086] Self-discharge refers to the phenomenon that the battery's power gradually decreases without a load. If the self-discharge degree of the battery is relatively serious, then it can be considered that the produced battery is a defective product and needs to be reworked.

[0087] So far, the above Figure 1The battery self-discharge detection process shown. During the process of the battery gradually dissipating heat from a relatively high temperature, by detecting the temperature of the battery in real time and based on the temperature matching result between the real-time battery temperature and the preset temperature ranges of each test area, the battery is automatically moved to the corresponding test area by the battery moving unit. And it is necessary to detect the K value of the battery in each test area respectively. Since each test area corresponds to a preset temperature range, the battery can be moved to different test areas according to the real-time battery temperature for K value detection respectively. The temperature difference between the batteries in the same test area is small, which can reduce the influence of high-temperature batteries on the K value of normal-temperature batteries and improve the accuracy of self-discharge detection. And during the heat dissipation process of the battery, the K values at different temperature stages can be continuously obtained and an effective self-discharge anomaly judgment can be made, without having to let the battery stand still at room temperature for self-discharge detection, which can effectively shorten the battery standing time and improve the battery production rhythm.

[0088] In some embodiments, step 202 above may include:

[0089] When the real-time temperature is less than or equal to the maximum temperature in the continuous range, determine the target preset temperature range to which the real-time temperature belongs, and move the battery to the target test area corresponding to the target preset temperature range by the battery moving unit; according to the real-time temperature dropping to the preset temperature range 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 by the battery moving unit until the battery is moved to the test area corresponding to the smallest preset temperature range in the continuous range.

[0090] Since the preset temperature ranges respectively corresponding to the adjacent test areas are gradually decreasing, that is, the temperature range corresponding to the first test area is higher than the temperature range corresponding to the second test area, and so on. The temperature of the battery gradually decreases during the heat dissipation process. Therefore, when the temperature of the battery is within the continuous range formed by these preset temperature ranges, first transport the battery to the target test area corresponding to the target preset temperature range to which the battery temperature belongs, and then the temperature gradually decreases during the heat dissipation process, and move to the next test area in turn until the last test area.

[0091] It should be noted that the target test area where the battery first enters may be any one of the test areas, which needs to be determined according to the target preset temperature range to which its temperature matches.

[0092] Exemplarily, as described above Figure 1 shown, assume 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.

[0093] In this embodiment, since the preset temperature ranges corresponding to the respective test areas are continuous ranges, and the test areas corresponding to any two adjacent preset temperature ranges are arranged adjacent to each other, during the heat dissipation process of the battery, first, when the battery temperature is less than or equal to the maximum temperature in the continuous range, the battery is first moved to the target test area corresponding to the target preset temperature range to which it belongs, and then, according to the change in temperature, the battery can be sequentially transferred from the target test area to the last test area. In this way, the battery completes a K-value detection every time it passes through a test area, ensuring the continuity of the battery K-value detection.

[0094] In some embodiments, based on the above step 202, it may further include:

[0095] When the real-time temperature is greater than the maximum temperature in the continuous range, the battery is moved to the static area by the battery moving unit for static placement, and then the step of determining the target preset temperature range to which the real-time temperature belongs is performed when the real-time temperature is less than or equal to the maximum temperature in the continuous range.

[0096] 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.

[0097] Exemplarily, assume that the maximum preset temperature range is 35°C - 45°C, that is, the temperature range corresponding to the first test area, and the initial temperature of the battery is 55°C, indicating that the temperature of the battery is too high at this time and it is not suitable to directly enter the test area for K-value detection. Therefore, the battery is first transferred to the static area for static placement for a period of time. After 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.

[0098] It can be understood that usually the batteries are subjected to high-temperature aging treatment in batches, that is, a batch of batteries comes out after each high-temperature aging treatment. In a batch of batteries, some batteries may have a temperature within the preset temperature range corresponding to the first test area, and some batteries may have too high a temperature and not be within the preset temperature range corresponding to the first test area. Therefore, for the batteries with a temperature within the preset temperature range corresponding to the first test area, they are directly transferred to the first test area to start K-value detection, and for the batteries not within the preset temperature range corresponding to the first test area, they are first transferred to the static area for cooling and can enter the first test area together with the next batch of batteries.

[0099] In this embodiment, during the heat dissipation process of the battery, if the initial temperature of the battery is higher than the preset temperature range corresponding to each test area, it indicates that the battery temperature is too high at this time and is not suitable for K-value detection. By moving the battery to the static area for static placement, after the temperature drops, it is then moved to the target test area for K-value detection according to the target preset temperature range to ensure the accuracy of K-value detection.

[0100] In some embodiments, step 202 above may include:

[0101] For each test area, the battery voltage is collected once when the battery enters the test area and once when the battery exits the test area, and then the K-value of the battery in the test area is calculated using the battery voltages collected twice.

[0102] The collection of the two battery voltages can be at fixed positions in the test area to ensure the consistency of K-value detection of the battery in the test area. For example, the battery voltage is collected at the entrance and exit of the test area respectively.

[0103] It can be understood that since the calculation of the K-value also requires the time interval between the two battery voltages, the collection time is recorded when collecting the battery voltage to facilitate the calculation of the interval time.

[0104] In this embodiment, by calculating the K-value of the battery in the test area using the voltage when the battery enters the test area and the voltage when the battery exits the test area, the consistency of K-value detection of the battery in the test area can be ensured.

[0105] In some embodiments, for the process of moving the battery from the target test area to the next test area by the battery moving unit according to the preset temperature range corresponding to the next test area adjacent to the target test area when the real-time temperature drops, it may include:

[0106] At every preset time interval, the battery cooling rate is obtained using the real-time temperature; 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 the preset temperature range corresponding to the next test area, the battery is moved to the next test area.

[0107] The preset time interval can be understood as the time interval for adjusting the battery moving speed, and this time interval can be set according to practical experience, such as 10 min.

[0108] 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 change of the battery temperature is non-linear, so the battery cooling rate is dynamically changing.

[0109] The moving speed of the battery determines the length of its stationary time in the test area. By adjusting the moving speed using the battery cooling rate, the length of the stationary time of the battery in the test area can be adjusted, so that the transfer of the battery between the test areas can be achieved step by step.

[0110] Adjust the moving speed of the battery in the current test area according to the battery cooling rate. The specific method is as follows: when the battery cooling rate is greater than the preset cooling rate, the moving speed of the battery can be increased; when the battery cooling rate is less than the preset cooling rate, the moving speed of the battery can be decreased. In addition, the moving speed of the battery can also be adjusted according to the difference between the battery cooling rate, the temperature of the battery and the preset temperature range of the next test area, that is, when the difference from the preset temperature range of the next test area is 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 different cooling rates can be set for each test area. Of course, the same cooling rate can also be set correspondingly. This application does not make specific limitations on this.

[0111] In this embodiment, the moving speed of the battery 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 temperature of the battery drops to the preset temperature range corresponding to the next test area, the battery also automatically moves to the next test area.

[0112] It should be noted that in addition to the above strategy of combining the battery cooling rate and the battery moving speed to determine the battery transfer, a strategy of real-time monitoring whether the temperature of the battery drops to the preset temperature range corresponding to the next test area can also be used to determine the battery transfer.

[0113] In some embodiments, step 203 described above may include:

[0114] Use the K value in each test area and the correction coefficient corresponding to each test area to determine the average K value of the battery. When the average K value exceeds the preset value, it is determined that the self-discharge of the battery is abnormal; when the average K value does not exceed the preset value, it is determined that the self-discharge of the battery is normal.

[0115] The correction coefficient can be understood as being 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 values of each test area. Since each test area corresponds to a different temperature range, different correction coefficients correspond to each test area respectively.

[0116] The average K value refers to the average value of the K values in each test area after correction, and this average K value can represent the self-discharge rate of the battery in a room temperature environment.

[0117] The calculation formula of the average K value can be as follows:

[0118]

[0119] Among them, 、 …… represent the correction factors corresponding to each test area respectively, 、 …… represent the K values detected in each test area, and n represents the number of test areas.

[0120] The preset value can be understood as the minimum K value requirement for the battery to be identified as a defective product. This preset value can be set according to the self-discharge detection requirements, and the batteries that fail the self-discharge detection can be filtered out through this preset value.

[0121] In this embodiment, considering that the K value of the battery is significantly affected at different temperatures, by setting an appropriate correction factor for each test area respectively, the average K value of the battery is obtained by using the K value of each test area and the corresponding correction factor, so as to ensure the consistency of the K value and achieve accurate detection of the battery self-discharge.

[0122] In some embodiments, the battery self-discharge detection method may further include the determination process of the correction factor of each test area, and the process is as follows:

[0123] Obtain the first K value of the experimental battery at room temperature. For each test area, heat the temperature of the experimental battery to the corresponding preset temperature range of the test area, obtain the second K value of the experimental battery after heating, and determine the correction factor corresponding to the test area by using the first K value and the second K value.

[0124] The room temperature state can be understood as the room temperature environment, such as 25°C, that is, place the experimental battery at room temperature to measure the first K value.

[0125] The second K value is the K value measured by placing the experimental battery in the environment of the corresponding temperature range of the test area.

[0126] The calculation formula of the correction factor is as follows:

[0127]

[0128] In this embodiment, by using one experimental battery, obtain its K value at room temperature and the K value in the corresponding preset temperature range of the test area respectively, and thus the correction factor corresponding to the test area can be determined according to these two K values.

[0129] Based on the above-described embodiments, taking the test space including a high-temperature test area, a medium-temperature test area, and a room-temperature test area as an example, the following elaborates on the specific implementation process of battery transfer.

[0130] Figure 3 A schematic diagram of a battery transfer process shown according to an exemplary embodiment includes the following steps:

[0131] First, measure the temperature of the battery after high-temperature aging treatment. If the temperature difference from the maximum value in the temperature range of the high-temperature test area is within ±3°C, the battery enters the high-temperature test area for cooling treatment with circulating cooling air. If the temperature difference from the maximum value in the temperature range of the high-temperature test area is not within ±3°C, the battery is placed in the static area for temporary storage. At this time, the K-value detection is not performed, and the battery waits until its temperature drops within the temperature range of the high-temperature test area, and then the battery is transferred to the high-temperature test area.

[0132] Second, after the battery is transferred to the high-temperature test area, K-value detection and temperature detection are performed, and the temperature is compared with the temperature range of the medium-temperature test area at fixed intervals. If the temperature difference in the comparison is within ±3°C, the battery is transferred to the medium-temperature test area for K-value detection while performing temperature detection; 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 temperature difference in the comparison is within ±3°C, the battery is transferred to the normal-temperature test area for K-value detection while performing temperature detection; otherwise, the temperature detection continues in the medium-temperature test area. After the battery is transferred to the normal-temperature test area, the last K-value detection is completed.

[0133] Finally, after the K-value detection is completed in all three test areas, self-discharge abnormality judgment is performed.

[0134] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. Their similarities or similarities can be referred to each other. For the sake of brevity, they will not be elaborated herein.

[0135] Those skilled in the art can understand that in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation to the implementation process. The specific execution order of each step should be determined according to its function and possible internal logic.

[0136] Corresponding to the embodiments of the foregoing battery self-discharge detection method, the present application also provides embodiments of a battery self-discharge detection device.

[0137] Figure 4 A schematic diagram of the structure of a battery self-discharge detection device shown according to an exemplary embodiment of the present application. This device is used to execute the battery self-discharge detection method provided in any of the above embodiments, as Figure 4 shown, this battery self-discharge detection device includes:

[0138] An acquisition module 410, configured to acquire the real-time temperature of the battery during the heat dissipation process and the preset temperature ranges corresponding to each test area;

[0139] A battery moving module 420, configured to move the battery to a corresponding test area through the battery moving unit according to the temperature matching result between the preset temperature range of each test area and the real-time temperature;

[0140] A battery testing module 430, configured to respectively detect the K value of the battery in each test area;

[0141] A judgment module 440, configured to judge whether the battery has abnormal self-discharge according to the K value of the battery in each test area.

[0142] For the implementation processes of the functions and roles of each unit in the above device, please refer to the implementation processes of the corresponding steps in the above method for details, which will not be elaborated here.

[0143] 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 embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this application. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0144] The embodiment of the present application also provides an electronic device corresponding to the battery self-discharge detection method provided in the foregoing embodiment to execute the above battery self-discharge detection method.

[0145] Figure 5 FIG. is a hardware structure diagram of an electronic device shown according to an exemplary embodiment of the present application. 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 above-described battery self-discharge detection method by reading and executing machine-executable instructions corresponding to the control logic of the battery self-discharge detection method in the memory 603. For the specific content of this method, please refer to the above embodiments, and will not be repeated here.

[0146] The memory 603 mentioned in this application can be any electronic, magnetic, optical or other physical storage device, which can store information such as executable instructions, data, etc. Specifically, the memory 603 can be RAM (Random Access Memory), flash memory, a storage drive (such as a hard disk drive), any type of storage disk (such as an optical disk, DVD, etc.), or a similar storage medium, or a combination thereof. The communication connection between this 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.

[0147] The bus 604 can be an ISA bus, a PCI bus, an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. Among them, the memory 603 is used to store a program, and after receiving an execution instruction, the processor 602 executes the program.

[0148] 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 integrated logic circuit in the hardware of the processor 602 or the instructions in software form. The above-mentioned processor 602 can be a general-purpose processor, including a central processing unit (CPU for short), a network processor (NP for short), 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 gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of this application. 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 combination with the embodiments of this application can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of the hardware and software modules in the decoding processor.

[0149] The electronic device provided in the embodiments of this application and the battery self-discharge detection method provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by them.

[0150] The embodiments of this application also provide a computer-readable storage medium corresponding to the battery self-discharge detection method provided in the foregoing embodiments. Please refer to Figure 6 As shown, the computer-readable storage medium shown is an optical disc 30, on which a computer program (i.e., a program product) is stored. When the computer program is run by a processor, it will execute the battery self-discharge detection method provided in any of the foregoing embodiments.

[0151] It should be noted that examples of the computer-readable storage medium may further 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 and magnetic storage media, which will not be elaborated herein one by one.

[0152] The computer-readable storage medium provided by the above embodiments of the present application and the battery self-discharge detection method provided by the embodiments of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run, or implemented by the application programs stored therein.

[0153] The embodiments of the present application also provide a computer program product corresponding to the battery self-discharge detection method provided by the foregoing embodiments, including a computer program, which when executed by a processor implements the battery self-discharge detection method provided by any of the foregoing embodiments.

[0154] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0155] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, commodity or device comprising the element.

[0156] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within 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; In the case where the real-time temperature is less than or equal to the maximum temperature in the continuous interval, the battery is moved to each of the test areas respectively 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; the temperature matching result indicates the target preset temperature interval to which the real-time temperature of the battery during the heat dissipation process belongs, and the target preset temperature interval is one of the preset temperature intervals corresponding to each of the test areas; The system further comprises a static zone adjacent to the test zone corresponding to the largest preset temperature interval in each test zone, and when the real-time temperature is greater than the maximum temperature in the continuous interval, the battery is moved to the static zone by the battery moving unit for static use until the real-time temperature drops to less than or equal to the maximum temperature in the continuous interval, and the step of moving the battery to each test zone respectively by the battery moving unit is performed according to the temperature matching result between the preset temperature interval of each test zone and the real-time temperature; 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: 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.

3. 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.

4. 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.

5. 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.

6. The method according to claim 5, 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.

7. 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 6.

8. The system according to claim 7, 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.

9. The system according to claim 7, 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.

10. 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; The preset temperature intervals corresponding to the respective test zones are continuous intervals; A battery moving module, used for moving the battery to each of the test areas respectively through the battery moving unit according to a temperature matching result between the preset temperature range of each test area and the real-time temperature when the real-time temperature is less than or equal to the maximum temperature in the continuous range; the temperature matching result indicates a target preset temperature range to which the real-time temperature of the battery during the heat dissipation process belongs, and the target preset temperature range is one of the preset temperature ranges corresponding to each of the test areas; A battery testing module, used to detect the K value of the battery in each test area respectively; A judgment module, used for judging whether the battery has abnormal self-discharge according to the K value of the battery in each test area; The device also includes a static area adjacent to the test area corresponding to the largest preset temperature interval in each test area. The battery moving module is also used to move the battery to the static area through the battery moving unit for static use when the real-time temperature is greater than the maximum temperature in the continuous interval until the real-time temperature drops to less than or equal to the maximum temperature in the continuous interval, and execute the step of moving the battery to each test area respectively through the battery moving unit according to the temperature matching result between the preset temperature interval of each test area and the real-time temperature.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 6 are implemented.

12. 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 6 are implemented.

13. 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 6.

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