Battery self-discharge detection method and device and computer readable storage medium

Abstract

This application provides a battery self-discharge detection method, apparatus, and computer-readable storage medium, belonging to the field of battery technology. In this method, firstly, a first target voltage corresponding to the battery is determined, which is the voltage difference between the battery and a reference power supply; secondly, a second target voltage corresponding to the battery is determined, which is the voltage difference between the battery and the reference power supply after a preset time; finally, the self-discharge value of the battery is determined based on the first and second target voltages and the preset time. This application, by comparing the target voltage change of the battery before and after the preset time, can quickly and accurately obtain the self-discharge rate of the battery per unit time, thereby determining the self-discharge status of the battery. Furthermore, it eliminates the need to leave the battery idle for a long time, effectively improving the efficiency of battery self-discharge detection, shortening the battery production cycle, and reducing battery production costs.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery self-discharge detection method, apparatus, and computer-readable storage medium. Background Technology

[0002] Self-discharge of a battery refers to the phenomenon where, in an open-circuit state, a battery spontaneously loses some of its charge even without a load; it is also known as charge retention. Self-discharge causes the battery voltage to gradually decrease, especially under no-load conditions. Taking lithium-ion batteries as an example, these batteries are commonly used in mobile devices. Their self-discharge phenomenon is related to possible micro-short circuits between the positive and negative electrodes, or the presence of trace impurities in the positive and negative electrode materials and electrolyte. These factors lead to a certain degree of self-discharge in the battery. When the self-discharge of a battery is too large, it may cause the battery voltage to drop below the protection voltage level during long-term idleness or charging and discharging, thus seriously affecting the reliability and safety of the battery.

[0003] Given that excessive self-discharge can cause capacity loss and potential safety issues, the detection of battery self-discharge is particularly important in battery manufacturing and application. Currently, common methods for detecting battery self-discharge include high-temperature aging and room-temperature settling to screen for batteries with high self-discharge. To minimize missed cases, the settling time is usually extended, as a longer settling time can improve the effectiveness of screening out self-discharged batteries. However, extending the settling time also increases the battery production cycle and cost.

[0004] Therefore, low detection efficiency, long production cycle, and high production cost are urgent problems to be solved in the battery self-discharge detection process. Summary of the Invention

[0005] This application provides a battery self-discharge detection method, apparatus, and computer-readable storage medium to solve the problems of low detection efficiency, long production cycle, and high production cost in the existing battery self-discharge detection process.

[0006] In a first aspect, this application provides a battery self-discharge detection method, comprising: determining a first target voltage corresponding to the battery to be tested;

[0007] After a preset time period, a second target voltage corresponding to the battery under test is determined; wherein, the target voltage is the voltage between the second terminal of the battery under test and the second terminal of the reference power supply when the first terminal of the battery under test is connected to the first terminal of the reference power supply; the target voltage is either the first target voltage or the second target voltage.

[0008] The self-discharge value of the battery under test is determined based on the first target voltage, the second target voltage, and the preset duration; wherein the self-discharge value of the battery under test is used to indicate the self-discharge rate of the battery under test.

[0009] In one possible design, the reference power source is a reference battery, a constant voltage power source, or a capacitor.

[0010] In one possible design, determining the self-discharge value of the battery under test based on the first target voltage, the second target voltage, and the preset duration includes:

[0011] The difference between the second target voltage and the first target voltage is determined as the first value;

[0012] The ratio of the first value to the preset duration is determined as the second value;

[0013] Based on the second value, the self-discharge value of the battery under test is determined.

[0014] In one possible design, determining the self-discharge value of the battery under test based on the second value includes:

[0015] The second value is determined as the first self-discharge value of the battery under test, where the first self-discharge value is the relative self-discharge voltage decrease rate of the battery under test; or...

[0016] The sum of the second value and the first preset value is determined as the second self-discharge value of the battery under test. The second self-discharge value is the self-discharge voltage drop rate of the battery under test, wherein the first preset value is the voltage drop rate of the reference power supply.

[0017] In one possible design, determining the self-discharge value of the battery under test based on the second value further includes:

[0018] The product of the second value and the corresponding charge-to-voltage ratio of the battery under test is determined as the third self-discharge value, wherein the third self-discharge value is the relative self-discharge current of the battery under test; or,

[0019] The product of the second value and the voltage-to-charge ratio of the battery under test is determined as the third value, and the sum of the third value and the second preset value is determined as the fourth self-discharge value, wherein the fourth self-discharge value is the self-discharge current of the battery under test; wherein the second preset value is the self-discharge current of the reference power supply.

[0020] In one possible design, after determining the self-discharge value of the battery to be tested based on the first target voltage and the second target voltage, the method further includes:

[0021] Determine whether the self-discharge value of the battery under test is greater than a self-discharge threshold; wherein, the self-discharge threshold is a third preset value, or, the self-discharge threshold is related to the average value and standard deviation of the self-discharge values ​​of multiple batteries under test;

[0022] If the self-discharge value of the battery under test is greater than the self-discharge threshold, the battery under test is determined to have an abnormal self-discharge.

[0023] If the self-discharge value of the battery under test is less than or equal to the self-discharge threshold, the battery under test is determined to have normal self-discharge.

[0024] In one possible design, prior to determining the first target voltage corresponding to the battery to be tested, the method further includes:

[0025] The difference between the voltage of the battery to be tested and the voltage of the reference power supply is determined as the fourth value;

[0026] Determine whether the fourth value is less than a fourth preset value;

[0027] If the fourth value is greater than or equal to the fourth preset value, the voltage of the battery to be tested and / or the reference power supply is adjusted so that the fourth value is less than or equal to the fourth preset value.

[0028] In one possible design, before determining the self-discharge value of the battery under test based on the first target voltage, the second target voltage, and the preset duration, the method further includes:

[0029] When determining the first target voltage and the second target voltage, the first temperature and the second temperature of the battery under test are determined respectively;

[0030] The third target voltage of the battery under test is determined at different times within the preset time period, and the third temperature of the battery under test is determined at different times within the preset time period.

[0031] Based on the first temperature, the second temperature, and the plurality of the third temperatures, the cell temperature coefficient of the battery under test is obtained;

[0032] Based on the cell temperature coefficient, temperature compensation is performed on the first target voltage and the second target voltage to obtain the temperature-compensated first target voltage and the temperature-compensated second target voltage.

[0033] Determining the self-discharge value of the battery under test based on the first target voltage, the second target voltage, and the preset duration includes:

[0034] The self-discharge value of the battery under test is determined based on the first target voltage after temperature compensation and the second target voltage after temperature compensation.

[0035] Secondly, this application provides a battery self-discharge detection device, comprising: a module for performing the aforementioned method embodiment of the first aspect.

[0036] Thirdly, this application provides an electronic device, including: a memory and at least one processor;

[0037] The memory stores computer-executed instructions;

[0038] The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method described in the first aspect or various possible designs of the first aspect.

[0039] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed, implement the method described in the first aspect or various possible designs of the first aspect.

[0040] Fifthly, this application provides a computer program product, which includes computer program code that, when run on a computer, causes the computer to implement the method described in the first aspect or various possible designs of the first aspect.

[0041] In a sixth aspect, this application provides a chip, comprising: an interface circuit and a logic circuit, wherein the interface circuit is configured to receive signals from other chips outside the chip and transmit them to the logic circuit, or to send signals from the logic circuit to other chips outside the chip, and the logic circuit is configured to implement the method described in the first aspect or various possible designs of the first aspect.

[0042] This application provides a battery self-discharge detection method, apparatus, and computer-readable storage medium. In this battery self-discharge detection method, firstly, a first target voltage corresponding to the battery to be tested is determined, where the first target voltage is the voltage difference between the battery to be tested and a reference power supply at a first moment; secondly, a second target voltage corresponding to the battery to be tested is determined, where the second target voltage is the voltage difference between the battery to be tested and the reference power supply at a second moment, where the second moment is a moment after the first moment, and the duration between the second moment and the first moment is a preset duration; finally, the self-discharge value of the battery to be tested is determined based on the first target voltage, the second target voltage, and the preset duration. This application, by comparing the target voltage change of the battery before and after the preset duration, can quickly and accurately obtain the self-discharge rate of the battery per unit time, thereby determining the self-discharge status of the battery to be tested. Compared with traditional methods, the battery self-discharge detection method provided in this application does not require the battery to be left idle for a long time, effectively improving the battery self-discharge detection efficiency, shortening the battery production cycle, and reducing battery production costs. Attached Figure Description

[0043] Figure 1 A schematic flowchart of a battery self-discharge detection method provided in an embodiment of this application;

[0044] Figure 2 A schematic flowchart of another battery self-discharge detection method provided in an embodiment of this application;

[0045] Figure 3 A schematic flowchart illustrating another battery self-discharge detection method provided in this application embodiment;

[0046] Figure 4 This is a schematic diagram of the structure of a battery self-discharge detection device provided in an embodiment of this application;

[0047] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0050] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B can exist simultaneously, and B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0052] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0053] In the description of this application, unless otherwise stated, "multiple" and "at least two" mean two or more (including two), and similarly, "multiple groups" and "at least two groups" mean two or more (including two groups).

[0054] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, "connected" or "linked" can refer not only to a physical connection, but also to an electrical connection or a signal connection. For instance, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is connected. It can also refer to the internal connection between two components. A signal connection can refer not only to a signal connection through a circuit, but also to a signal connection through a medium, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, different technical features in this application can be combined with each other.

[0056] Figure 1 This is a schematic flowchart illustrating a battery self-discharge detection method provided in an embodiment of this application. Figure 1 As shown, the battery self-discharge detection method provided in this application embodiment specifically includes S101 to S103, and S101 to S103 will be described in detail below.

[0057] It should be noted that the controller can be the main implementer of this battery self-discharge detection method.

[0058] S101. Determine the first target voltage corresponding to the battery to be tested.

[0059] The target voltage is the voltage between the second terminal of the battery under test and the second terminal of the reference power supply when the first terminal of the battery under test is connected to the first terminal of the reference power supply.

[0060] It should be noted that the target voltage is either the first target voltage or the second target voltage.

[0061] The target voltage can be the voltage between the positive terminal of the battery under test and the positive terminal of the reference power supply when the negative terminal of the battery under test is connected to the negative terminal of the reference power supply; or it can be the voltage between the negative terminal of the battery under test and the negative terminal of the reference power supply when the positive terminal of the battery under test is connected to the positive terminal of the reference power supply. This embodiment does not specifically limit it.

[0062] In this embodiment, the first target voltage of the battery to be tested is the voltage between the positive terminal of the battery to be tested and the positive terminal of the reference power supply when the negative terminal of the battery to be tested is connected to the negative terminal of the reference power supply; that is, the first target voltage is the voltage difference between the battery to be tested and the reference power supply.

[0063] Specifically, the first target voltage corresponding to the battery under test can be obtained by measuring the voltage between the positive terminal of the battery under test and the positive terminal of the reference power supply when the negative terminal of the battery under test is connected to the negative terminal of the reference power supply using a voltmeter.

[0064] S102. After a preset time, determine the second target voltage corresponding to the battery to be tested.

[0065] The preset duration can be set by the user according to actual needs, and this embodiment does not impose specific limitations on it.

[0066] It should be noted that the preset duration can be less than 12 hours.

[0067] For example, the preset duration can be 1 hour or 3 hours.

[0068] In this embodiment, the second target voltage of the battery to be tested is the voltage between the positive terminal of the battery to be tested and the positive terminal of the reference power supply when the negative terminal of the battery to be tested is connected to the negative terminal of the reference power supply after a preset time.

[0069] It should be noted that the self-discharge of the battery under test is a continuous process. Within a preset time period, the battery under test self-discharges. By determining the first target voltage and the second target voltage corresponding to the battery under test before and after the preset time period, the self-discharge value of the battery under test within the preset time period can be determined, which is helpful in subsequently determining whether the battery under test has any abnormal self-discharge problem.

[0070] Within a preset time period, the first end of the battery to be tested can be connected to the first end of the reference power supply or disconnected from the first end of the reference power supply. This embodiment does not specifically limit this.

[0071] In one possible embodiment, the reference power source is a reference battery, a constant voltage power source, or a capacitor.

[0072] The voltage difference between the reference power supply and the battery under test is less than the preset voltage difference, so that the first target voltage and the second target voltage of the battery under test can be measured by a voltmeter with a smaller measurement range, thereby improving the self-discharge detection accuracy of the battery under test.

[0073] It should be noted that the preset voltage difference can be set by the user according to actual needs, and this embodiment does not impose specific limitations on it.

[0074] For example, the preset voltage difference can be 100mV, or the preset voltage difference can be 10mV.

[0075] When the reference power source is a reference battery, the reference battery is preferably one with a temperature-dependent voltage coefficient similar to that of the battery under test. This reduces the impact of temperature on the first and second target voltages, thereby improving the self-discharge detection accuracy of the battery under test. The temperature-dependent voltage coefficient of a battery refers to the change in battery voltage for every 1°C change in temperature.

[0076] For example, the reference battery is a battery from the same batch as the battery under test.

[0077] In this embodiment, since the reference battery can be selected as a battery with a temperature-dependent voltage coefficient similar to that of the battery under test, the reference battery is the best choice as the reference power source.

[0078] S103. Determine the self-discharge value of the battery to be tested based on the first target voltage, the second target voltage, and the preset duration.

[0079] Among them, the self-discharge value of the battery under test is used to indicate the self-discharge rate of the battery under test per unit time.

[0080] It should be noted that, based on the first target voltage and the second target voltage corresponding to the battery under test before and after the preset time, as well as the preset time, the self-discharge rate of the battery under test per unit time can be determined. This is to facilitate subsequent determination of whether the battery under test has any self-discharge abnormalities based on the self-discharge rate of the battery under test per unit time.

[0081] This application provides a battery self-discharge detection method. First, a first target voltage is determined for the battery under test, which is the voltage difference between the battery under test and a reference power supply at a first moment. Second, a second target voltage is determined for the battery under test, which is the voltage difference between the battery under test and the reference power supply at a second moment. The second moment is a time after the first moment, and the duration between the second moment and the first moment is a preset duration. Finally, the self-discharge value of the battery under test is determined based on the first and second target voltages and the preset duration. This application, by comparing the target voltage change of the battery before and after the preset duration, can quickly and accurately obtain the self-discharge rate of the battery per unit time, thereby determining the self-discharge status of the battery under test. Compared with traditional methods, the battery self-discharge detection method provided in this application does not require the battery to be left idle for a long time, effectively improving the battery self-discharge detection efficiency, shortening the battery production cycle, and reducing battery production costs.

[0082] In the above embodiments, it is necessary to determine the self-discharge value of the battery under test based on the first target voltage and the second target voltage. The specific process of determining the self-discharge value of the battery under test based on the first target voltage and the second target voltage will be described in detail below.

[0083] In one possible embodiment, S103, determining the self-discharge value of the battery to be tested based on the first target voltage and the second target voltage, can be achieved through S1031 to S1033, which will be described in detail below.

[0084] S1031. The difference between the second target voltage and the first target voltage is determined as the first value.

[0085] The first value reflects the voltage change of the battery under test within a preset time period, and the unit of the first value is volts (V).

[0086] It should be noted that the first value A1 can be obtained according to the formula A1=ΔU2-ΔU1; ΔU2 represents the second target voltage corresponding to the battery to be tested, in volts (V); ΔU1 represents the first target voltage corresponding to the battery to be tested, in volts (V).

[0087] In this embodiment, by calculating the first value, the voltage change of the battery under test within a preset time period can be quantified, thereby reflecting the self-discharge status of the battery under test.

[0088] S1032. The ratio of the first value to the preset duration is determined as the second value.

[0089] The second value reflects the rate of voltage change of the battery under test per unit time.

[0090] It should be noted that, according to the formula The second value A2 can then be obtained; T represents the preset duration, in hours (h).

[0091] In this embodiment, by calculating the second value, the voltage change rate of the battery under test per unit time can be obtained, so as to facilitate the subsequent evaluation of the self-discharge of the battery under test.

[0092] S1033. Based on the second value, determine the self-discharge value of the battery to be tested.

[0093] It should be noted that, after determining the second value, that is, the rate of voltage change of the battery under test per unit time, the self-discharge value of the battery under test can be further determined based on the second value.

[0094] In this embodiment, firstly, the voltage difference between the second target voltage and the first target voltage of the battery under test before and after a preset time period is calculated to obtain the voltage change value of the battery under test within the preset time period; secondly, the voltage change value within the preset time period is standardized with the preset time period to obtain the voltage change rate of the battery under test per unit time; finally, based on the voltage change rate of the battery under test per unit time, the self-discharge value of the battery under test is determined. This method can not only quickly assess the self-discharge status of the battery under test, but also improve measurement accuracy, avoid the problems of long waiting time and low efficiency that may exist in traditional methods, thereby effectively improving the efficiency of battery self-discharge detection, reducing production cycle, reducing production cost, and ensuring battery quality and reliability.

[0095] In the above embodiments, it is necessary to determine the self-discharge value of the battery under test based on the second value. Next, a method for determining the self-discharge value of the battery under test based on the second value will be described in detail.

[0096] In one possible embodiment, in the method step shown in S1033, the second value is determined as the first self-discharge value of the battery to be tested.

[0097] The first self-discharge value is the relative self-discharge voltage decrease rate of the battery under test.

[0098] In another possible embodiment, in the method step shown in S1033, the sum of the second value and the first preset value is determined as the second self-discharge value of the battery to be tested.

[0099] The first preset value is the voltage drop rate of the reference power supply.

[0100] It should be noted that the first preset value is used to indicate the rate at which the voltage of the reference power supply drops per unit time, in volts per hour (V / h).

[0101] It should be noted that the first preset value can be measured and set by the user, and this embodiment will not elaborate on this.

[0102] For example, the first preset value is 0.

[0103] For example, the first preset value is 0.02uV / h.

[0104] The second self-discharge value is the rate of decrease in the self-discharge voltage of the battery under test.

[0105] It should be noted that, unlike the first self-discharge value of the battery under test, the second self-discharge value of the battery under test also takes into account the first preset value, which is the voltage drop rate of the reference power supply. Therefore, the second self-discharge value is an absolute value.

[0106] In this embodiment, by incorporating a first preset value into the calculation, a second self-discharge value of the battery under test is obtained, providing a more accurate self-discharge assessment of the battery under test.

[0107] In the above embodiments, it is necessary to determine the self-discharge value of the battery under test based on the second value. Next, another method for determining the self-discharge value of the battery under test based on the second value will be described in detail.

[0108] In one possible embodiment, in the method step shown in S1033, the product of the second value and the charge-to-voltage ratio corresponding to the battery to be tested is determined as the third self-discharge value.

[0109] The charge-to-voltage ratio (CTR) is the amount of charge required to discharge a battery when its voltage drops by 1V. The CTR can be expressed as dQ / dV, where V represents the change in the battery's open-circuit voltage and Q represents the change in the battery's charge. Therefore, the unit of the CTR is Ah / V.

[0110] It should be noted that the method for obtaining the charge-to-voltage ratio of the battery under test is an existing method, and will not be described in detail in this embodiment.

[0111] The third self-discharge value is the relative self-discharge current of the battery under test.

[0112] It should be noted that the third self-discharge value I3I1 can be obtained according to the formula I1=A2×c; c represents the charge-to-voltage ratio of the battery under test.

[0113] In this embodiment, the self-discharge assessment of the battery under test is further refined by combining the voltage change rate with the charge-to-voltage ratio. The third self-discharge value more accurately reflects the degree of self-discharge of the battery under test, taking into account the influence of different charge-to-voltage ratios among individual batteries under test, and provides a more accurate self-discharge rate assessment scheme for the battery under test.

[0114] In another possible embodiment, in the method step shown in S1033, the product of the second value and the charge-voltage ratio corresponding to the battery to be tested is determined as the third value, and the sum of the third value and the second preset value is determined as the fourth self-discharge value.

[0115] The second preset value is used to indicate the rate at which the capacity of the reference power supply decreases per unit time. That is, the second preset value is the self-discharge current of the reference power supply, in amperes (A).

[0116] For example, the current drop rate of the reference power supply might be 0.01 mAh of capacity reduction per hour, with a self-discharge current of 0.01 mA.

[0117] It should be noted that the second preset value can be measured and set by the user, and this embodiment will not elaborate on this.

[0118] For example, the second preset value is 0.

[0119] For example, the second preset value is 0.05mA.

[0120] The fourth self-discharge value is the self-discharge current of the battery under test.

[0121] It should be noted that the third value is the third self-discharge value in the above embodiment, the second preset value is the self-discharge current of the reference power supply, and the fourth self-discharge value is the sum of the third value and the second preset value. The fourth self-discharge value represents the self-discharge current of the battery under test, and combines the self-discharge current of the reference power supply, so that the fourth self-discharge value depends not only on the actual voltage change and charge-to-voltage ratio of the battery under test, but also on the current decrease rate of the reference power supply.

[0122] Specifically, given the fourth self-discharge value, and combined with the voltage of the battery under test, the discharge resistance R of the battery under test can be calculated using the formula R = U / I, where U represents the voltage of the battery under test and I represents the fourth self-discharge value.

[0123] In this embodiment, the fourth self-discharge value can better adapt to different test environments or requirements, making the self-discharge test results of the battery under test more comprehensive and standardized, which helps to improve the accuracy and consistency of the test process.

[0124] In the above embodiments, it is necessary to determine the self-discharge value of the battery to be tested based on the first target voltage and the second target voltage. Next, the specific process of determining whether the self-discharge of the battery to be tested is abnormal based on the self-discharge value of the battery to be tested will be described in detail.

[0125] Figure 2 This is a schematic flowchart of another battery self-discharge detection method provided in an embodiment of this application, as shown below. Figure 2 As shown, in one possible embodiment, the method for determining whether the self-discharge of the battery under test is abnormal based on the self-discharge value of the battery under test can be implemented by S104 to S106, and S104 to S106 will be described in detail below.

[0126] S104. Determine whether the self-discharge value of the battery to be tested is greater than the self-discharge threshold.

[0127] The self-discharge threshold is a reference value used to determine whether the battery's self-discharge is abnormal.

[0128] In one embodiment of this application, the self-discharge threshold is a third preset value.

[0129] The third preset value can be set by the user according to actual needs, and this embodiment does not impose specific limitations on it.

[0130] For example, the third preset value is 0.00002V / h, or the third preset value is 0.015mA.

[0131] In another embodiment of this application, the self-discharge threshold is related to the average and standard deviation of the self-discharge values ​​of a plurality of batteries to be tested.

[0132] It should be noted that, when the self-discharge threshold is related to the average and standard deviation of the self-discharge values ​​of multiple batteries under test, the self-discharge values ​​of multiple batteries under test are first measured; second, the average and standard deviation of the self-discharge values ​​of multiple batteries under test are calculated; and finally, the self-discharge threshold is set based on the average and standard deviation of the self-discharge values ​​of multiple batteries under test.

[0133] When determining the self-discharge values ​​of multiple batteries to be tested, the method for determining the self-discharge value of any battery to be tested is the same as the method for determining the self-discharge value of the battery to be tested in the above embodiment, and will not be repeated in this embodiment.

[0134] For example, the self-discharge threshold is the average of the self-discharge values ​​of multiple batteries under test ± 3 standard deviations, or the self-discharge threshold is the average of the self-discharge values ​​of multiple batteries under test ± 4 standard deviations.

[0135] It should be noted that when the self-discharge value of the battery under test is greater than the self-discharge threshold, the method steps shown in S105 are executed; when the self-discharge value of the battery under test is less than or equal to the self-discharge threshold, the method steps shown in S106 are executed.

[0136] S105. If the self-discharge value of the battery under test is greater than the self-discharge threshold, the battery under test is determined to have an abnormal self-discharge.

[0137] Abnormal battery self-discharge indicates a potential quality problem, such as an internal short circuit. This could prevent the battery from maintaining sufficient charge during normal use, affecting its performance and safety.

[0138] S106. If the self-discharge value of the battery under test is less than or equal to the self-discharge threshold, the battery under test is determined to have normal self-discharge.

[0139] Normal battery self-discharge means that the battery's self-discharge rate is within the expected range and has not exceeded the set self-discharge threshold, and the battery can be stored and used normally.

[0140] In this embodiment, the self-discharge value of the battery under test is compared with a self-discharge threshold to determine whether the self-discharge of the battery under test is abnormal. The self-discharge threshold can be a fixed preset value or dynamically adjusted based on the average and standard deviation of the self-discharge values ​​of multiple batteries under test, to ensure the flexibility and accuracy of battery self-discharge detection. If the self-discharge value of the battery under test is greater than the self-discharge threshold, it is determined that the battery under test has an abnormal self-discharge, so as to promptly identify batteries under test with abnormal self-discharge and prevent them from entering the usage stage; if the self-discharge value of the battery under test is less than or equal to the self-discharge threshold, it is considered that the self-discharge of the battery under test is normal. This method improves the automation and intelligence level of battery self-discharge detection, effectively enhances the quality control of battery production, and ensures the reliability and safety of batteries.

[0141] In the above embodiments, before determining the first target voltage corresponding to the battery to be tested, it is necessary to control the voltage difference between the reference power supply and the battery to be tested to be less than a preset voltage difference. Next, the specific process of controlling the voltage difference between the reference power supply and the battery to be tested to be less than the preset voltage difference will be described in detail.

[0142] Figure 3 This is a schematic flowchart illustrating another battery self-discharge detection method provided in an embodiment of this application. Figure 3As shown, in one possible embodiment, controlling the voltage difference between the reference power supply and the battery under test to be less than a preset voltage difference can be achieved by Sa1 to Sa3, which will be described in detail below.

[0143] Sa1. The difference between the voltage of the battery to be tested and the voltage of the reference power supply is determined as the fourth value.

[0144] The fourth value is the voltage difference between the reference power supply and the battery under test.

[0145] Sa2, Determine whether the fourth value is less than the fourth preset value.

[0146] The fourth preset value is the preset voltage difference.

[0147] It should be noted that if the fourth value is less than the fourth preset value, the method steps shown in S101 are executed; if the fourth value is greater than or equal to the fourth preset value, the method steps shown in Sa3 are executed.

[0148] Sa3. If the fourth value is greater than or equal to the fourth preset value, adjust the voltage of the battery to be tested and / or the reference power supply so that the fourth value is less than or equal to the fourth preset value.

[0149] It should be noted that when the fourth value is greater than or equal to the fourth preset value, the voltage of the battery to be tested and / or the reference power supply is adjusted, and the method steps shown in Sa1 above are repeated until the fourth value is less than the fourth preset value.

[0150] In this embodiment, the voltage difference (fourth value) between the battery under test and the reference power supply is measured and compared with a preset voltage difference (fourth preset value) to determine whether the fourth value is less than the fourth preset value. If the fourth value is greater than or equal to the fourth preset value, the voltage of the battery under test and / or the reference power supply is adjusted until the voltage difference between the battery under test and the reference power supply is less than the fourth preset value. This facilitates the subsequent measurement of the first target voltage and the second target voltage using a voltmeter with a smaller voltage range, effectively improving the accuracy and reliability of the measurement and ensuring the precision of battery self-discharge detection.

[0151] In the above embodiments, temperature changes affect the measurement results of the first target voltage and the second target voltage, thereby affecting the self-discharge value of the battery under test. The following will detail the specific process for reducing the impact of temperature changes on the self-discharge value of the battery under test.

[0152] In one possible embodiment, prior to the method step shown in S103, the battery self-discharge detection method further includes Sd1 to Sd4, which are described in detail below.

[0153] Sd1. When determining the first target voltage and the second target voltage, determine the first temperature and the second temperature of the battery to be tested, respectively.

[0154] It should be noted that when determining the first target voltage for the battery under test, the current temperature of the battery can be detected using a temperature sensor to obtain the first temperature of the battery under test. When determining the second target voltage for the battery under test, the current temperature of the battery can be detected again using a temperature sensor to obtain the second temperature of the battery under test.

[0155] Sd2, determine the third target voltage of the battery under test at different times within a preset time period, and the third temperature of the battery under test at different times within a preset time period.

[0156] The number of third target voltages corresponding to the batteries to be tested within the preset time period can be set by the user, and this embodiment does not impose specific limitations on this.

[0157] For example, the five third target voltages corresponding to the battery to be tested are determined at five moments within a preset time period.

[0158] It should be noted that the third target voltage corresponding to the battery under test is determined at different times within the preset time period, resulting in multiple third target voltages corresponding to the battery under test. At the same time, when determining the third target voltage corresponding to the battery under test at different times within the preset time period, the current temperature of the battery under test is detected by a temperature sensor to obtain the third temperature of the battery under test at different times within the preset time period.

[0159] Sd3, based on the first temperature, the second temperature and multiple third temperatures, obtains the cell temperature coefficient of the battery under test.

[0160] Specifically, firstly, the time when the target voltage of the battery under test is determined each time is denoted as x, the temperature of the battery under test determined each time is denoted as y, and the target voltage of the battery under test determined each time is denoted as z, resulting in multiple sets of (x, y, z); secondly, for each set of (x, y, z), the cell temperature coefficient expression corresponding to each set of (x, y, z) is obtained according to the formula z = a + k × y + m × z, where a represents the initial voltage of the battery under test, k represents the self-discharge voltage drop rate of the battery under test, and m represents the cell temperature coefficient of the battery under test; finally, by fitting the cell temperature coefficient expressions corresponding to the multiple sets of (x, y, z), the self-discharge voltage drop rate k and the cell temperature coefficient m of the battery under test can be obtained.

[0161] Sd4. Based on the cell temperature coefficient, temperature compensation is performed on the first target voltage and the second target voltage to obtain the temperature-compensated first target voltage and the temperature-compensated second target voltage.

[0162] Given the cell temperature coefficient of the battery under test, temperature compensation is applied to the first target voltage and the second target voltage corresponding to the battery under test to obtain the temperature-compensated first target voltage and the temperature-compensated second target voltage. Based on the temperature-compensated first target voltage and the temperature-compensated second target voltage, the self-discharge value of the battery under test is determined.

[0163] In this embodiment, the method steps shown in S103 can specifically be: determining the self-discharge value of the battery to be tested based on the first target voltage after temperature compensation and the second target voltage after temperature compensation.

[0164] The method for determining the self-discharge value of the battery to be tested based on the first target voltage after temperature compensation and the second target voltage after temperature compensation is similar to the method shown in S1031 to S1033 above, and will not be described again in this embodiment.

[0165] In another possible embodiment, the slope of the target voltage corresponding to the battery under test changing over time can be obtained based on the first target voltage, the second target voltage, and a plurality of third target voltages corresponding to the battery under test, and the self-discharge value of the battery under test can be determined based on the slope corresponding to the battery under test.

[0166] In this embodiment, the self-discharge level of the battery under test can be evaluated based on the change in the slope corresponding to the battery under test. The greater the change in the slope corresponding to the battery under test, the smaller the self-discharge of the battery under test.

[0167] In another possible embodiment, the battery self-discharge detection method further includes Sc1 to Sc3, which are described in detail below.

[0168] Sc1. When determining the first target voltage and the second target voltage, determine the first temperature and the second temperature of the battery to be tested, respectively.

[0169] The method steps shown in Sc1 are the same as those shown in Sd1 in the above embodiment, and will not be repeated in this embodiment.

[0170] Sc2. Based on the first temperature, the first target voltage is corrected to obtain the corrected first target voltage.

[0171] It should be noted that, based on the first temperature, the first target voltage can be temperature compensated to obtain the corrected first target voltage.

[0172] The method of temperature compensation for the first target voltage based on the first temperature is an existing method, and will not be described in detail in this embodiment.

[0173] Sc3. Based on the second temperature, the second target voltage is corrected to obtain the corrected second target voltage.

[0174] It should be noted that by applying temperature compensation to the second target voltage based on the second temperature, the corrected second target voltage can be obtained.

[0175] The method of temperature compensation for the second target voltage based on the second temperature is an existing method, and will not be described in detail in this embodiment.

[0176] In this embodiment, the method steps shown in S103 can specifically be: determining the self-discharge value of the battery to be tested based on the corrected first target voltage and the corrected second target voltage.

[0177] It should be noted that, given the corrected first target voltage and the corrected second target voltage, the self-discharge value of the battery under test can be determined based on the corrected first target voltage and the corrected second target voltage.

[0178] In this embodiment, a temperature compensation mechanism is introduced during battery self-discharge detection, significantly improving the accuracy and stability of the detection. By recording the temperature of the battery under test when measuring the first and second target voltages, and correcting the first and second target voltages based on their temperatures, the influence of temperature changes on the first and second target voltages can be effectively eliminated, thereby reducing measurement errors caused by temperature fluctuations. This method ensures more accurate calculation of the self-discharge value of the battery under test, avoids temperature interference with the battery self-discharge detection results, and enhances measurement consistency and reliability under different temperature environments.

[0179] Figure 4 This is a schematic diagram of a battery self-discharge detection device provided in an embodiment of this application. Figure 4 As shown, the battery self-discharge detection device 400 provided in this embodiment can exist independently and is used to implement the operation corresponding to the controller in the above method embodiment.

[0180] The battery self-discharge detection device 400 may include a transceiver module 401 and a processing module 402. The processing module 402 is used for data processing, and the transceiver module 401 can implement corresponding communication functions. The transceiver module 401 may also be referred to as a communication interface or a communication unit.

[0181] Optionally, the battery self-discharge detection device 400 may further include a storage unit, which can be used to store instructions and / or data. The processing module 402 can read the instructions and / or data in the storage unit so that the battery self-discharge detection device 400 can implement the steps implemented by the controller in the aforementioned method embodiment.

[0182] The transceiver module 401 is used to perform the receiving-related operations of the controller in the method embodiment above, and the processing module 402 is used to perform the processing-related operations of the controller in the method embodiment above.

[0183] Optionally, the transceiver module 401 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiments. The receiving module is used to perform the receiving operation in the above method embodiments.

[0184] It should be noted that the battery self-discharge detection device 400 may include a transmitting module but not a receiving module. Alternatively, the battery self-discharge detection device 400 may include a receiving module but not a transmitting module. Specifically, it depends on whether the above-described scheme executed by the battery self-discharge detection device 400 includes both transmitting and receiving actions.

[0185] As an example, the battery self-discharge detection device 400 is used to perform the aforementioned... Figure 1 The actions performed by the controller in the illustrated embodiment.

[0186] The battery self-discharge detection device 400 may include a transceiver module 401 and a processing module 402.

[0187] The processing module 402 is used to determine the first target voltage corresponding to the battery to be tested.

[0188] The processing module 402 is further configured to determine a second target voltage corresponding to the battery to be tested after a preset time period; wherein, the target voltage is the voltage between the second terminal of the battery to be tested and the second terminal of the reference power supply when the first terminal of the battery to be tested is connected to the first terminal of the reference power supply; the target voltage is either a first target voltage or a second target voltage.

[0189] The processing module 402 is further configured to determine the self-discharge value of the battery under test based on the first target voltage and the second target voltage, as well as a preset duration; wherein the self-discharge value of the battery under test is used to indicate the self-discharge rate of the battery under test per unit time.

[0190] It should be understood that the corresponding processes performed by each module have been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0191] The processing module 402 in the preceding embodiments can be implemented by at least one processor or processor-related circuitry. The transceiver module 401 can be implemented by a transceiver or transceiver-related circuitry. The transceiver module 401 can also be referred to as a communication unit or communication interface. The storage unit can be implemented by at least one memory.

[0192] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 5 As shown, the electronic device 500 provided in this embodiment includes a memory 501 and a processor 502.

[0193] The memory 501 can be a separate physical unit, connected to the processor 502 via a bus 503. Alternatively, the memory 501 and processor 502 can be integrated and implemented in hardware. The memory 501 stores program instructions, which the processor 502 calls to execute the operations performed by the controller in any of the above method embodiments.

[0194] Optionally, when some or all of the methods in the above embodiments are implemented by software, the electronic device 500 may also include only the processor 502. A memory 501 for storing programs is located outside the electronic device 500, and the processor 502 is connected to the memory via circuits / wires to read and execute the programs stored in the memory. The processor 502 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP. The processor 502 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0195] The memory 501 may include volatile memory, such as random-access memory (RAM); the memory may also include non-volatile memory, such as flash memory, hard disk drive (HDD) or solid-state drive (SSD); the memory may also include a combination of the above types of memory.

[0196] For example, this application provides a chip including: an interface circuit and a logic circuit. The interface circuit is used to receive signals from other chips outside the chip and transmit them to the logic circuit, or to send signals from the logic circuit to other chips outside the chip. The logic circuit is used to perform the operations performed by the controller in the above method embodiments.

[0197] For example, this application provides a computer-readable storage medium having computer program instructions stored thereon, which are executed by the processor of an electronic device to cause the electronic device to perform the operations performed by the controller in the above method embodiments.

[0198] For example, this application provides a computer program product that, when run on an electronic device, causes the electronic device to perform the operations executed by the controller in the above method embodiments.

[0199] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting battery self-discharge, characterized in that, The method includes: Determine the first target voltage corresponding to the battery to be tested; After a preset time period, a second target voltage corresponding to the battery under test is determined; wherein, the target voltage is the voltage between the second terminal of the battery under test and the second terminal of the reference power supply when the first terminal of the battery under test is connected to the first terminal of the reference power supply; the target voltage is either the first target voltage or the second target voltage. The self-discharge value of the battery under test is determined based on the first target voltage, the second target voltage, and the preset duration; wherein the self-discharge value of the battery under test is used to indicate the self-discharge rate of the battery under test per unit time.

2. The method according to claim 1, characterized in that, The reference power source is a reference battery, a constant voltage power supply, or a capacitor.

3. The method according to claim 1, characterized in that, The step of determining the self-discharge value of the battery under test based on the first target voltage, the second target voltage, and a preset duration includes: The difference between the second target voltage and the first target voltage is determined as the first value; The ratio of the first value to the preset duration is determined as the second value; Based on the second value, the self-discharge value of the battery under test is determined.

4. The method according to claim 3, characterized in that, Determining the self-discharge value of the battery under test based on the second value includes: The second value is determined as the first self-discharge value of the battery under test, where the first self-discharge value is the relative self-discharge voltage decrease rate of the battery under test; or... The sum of the second value and the first preset value is determined as the second self-discharge value of the battery under test. The second self-discharge value is the self-discharge voltage drop rate of the battery under test, wherein the first preset value is the voltage drop rate of the reference power supply.

5. The method according to claim 3, characterized in that, Determining the self-discharge value of the battery under test based on the second value further includes: The product of the second value and the corresponding charge-to-voltage ratio of the battery under test is determined as the third self-discharge value, wherein the third self-discharge value is the relative self-discharge current of the battery under test; or, The product of the second value and the voltage-to-charge ratio of the battery under test is determined as the third value, and the sum of the third value and the second preset value is determined as the fourth self-discharge value, wherein the fourth self-discharge value is the self-discharge current of the battery under test; wherein the second preset value is the self-discharge current of the reference power supply.

6. The method according to claim 1, characterized in that, After determining the self-discharge value of the battery to be tested based on the first target voltage and the second target voltage, the method further includes: Determine whether the self-discharge value of the battery under test is greater than a self-discharge threshold; wherein, the self-discharge threshold is a third preset value, or, the self-discharge threshold is related to the average value and standard deviation of the self-discharge values ​​of multiple batteries under test; If the self-discharge value of the battery under test is greater than the self-discharge threshold, the battery under test is determined to have an abnormal self-discharge. If the self-discharge value of the battery under test is less than or equal to the self-discharge threshold, the battery under test is determined to have normal self-discharge.

7. The method according to claim 1, characterized in that, Before determining the first target voltage corresponding to the battery to be tested, the method further includes: The difference between the voltage of the battery to be tested and the voltage of the reference power supply is determined as the fourth value; Determine whether the fourth value is less than a fourth preset value; If the fourth value is greater than or equal to the fourth preset value, the voltage of the battery to be tested and / or the reference power supply is adjusted so that the fourth value is less than or equal to the fourth preset value.

8. The method according to claim 1, characterized in that, Before determining the self-discharge value of the battery to be tested based on the first target voltage, the second target voltage, and the preset duration, the method further includes: When determining the first target voltage and the second target voltage, the first temperature and the second temperature of the battery under test are determined respectively; The third target voltage of the battery under test is determined at different times within the preset time period, and the third temperature of the battery under test is determined at different times within the preset time period. Based on the first temperature, the second temperature, and the plurality of the third temperatures, the cell temperature coefficient of the battery under test is obtained; Based on the cell temperature coefficient, temperature compensation is performed on the first target voltage and the second target voltage to obtain the temperature-compensated first target voltage and the temperature-compensated second target voltage. Determining the self-discharge value of the battery under test based on the first target voltage, the second target voltage, and the preset duration includes: The self-discharge value of the battery under test is determined based on the first target voltage after temperature compensation and the second target voltage after temperature compensation.

9. A battery self-discharge detection device, characterized in that, include: Memory and at least one processor; The memory stores computer-executed instructions; The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions that, when executed, implement the method as described in any one of claims 1 to 8.

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