Battery detection method and device, and readable storage medium

Abstract

The present application provides a battery detection method and device, and a readable storage medium. The battery detection device includes: a voltage measurement module for connecting to a battery to be tested and measuring the open circuit voltage of the battery to be tested; a processor connected to the voltage measurement module for obtaining the open circuit voltage; a constant voltage source connected to the processor for inputting a test voltage to the battery to be tested after the battery to be tested has been stationary for a preset time, and the test voltage is the same as the open circuit voltage; a current measurement module connected to the battery to be tested for measuring the instantaneous current of the battery to be tested after the test voltage is input; and the processor is also connected to the current measurement module for obtaining the instantaneous current and determining the self-discharge characteristics of the battery to be tested based on the instantaneous current and a preset current threshold. The detection device is used to reduce the detection cost of the battery, improve the detection efficiency of the battery, and improve the applicability of battery detection.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery detection method and device, and a readable storage medium. Background Art

[0002] Battery self-discharge can cause battery failures such as low voltage and zero voltage during storage. That is, the self-discharge performance of the battery affects the quality of the battery. Therefore, the self-discharge performance of the battery can be tested to determine the quality of the battery.

[0003] In existing technology, a constant voltage charging method can be used to test the self-discharge performance of batteries. However, this method requires a long period of time to occupy the equipment (testing equipment) during the test process, which wastes equipment costs and energy consumption, resulting in low test efficiency and poor applicability. Summary of the Invention

[0004] The purpose of this application is to provide a battery detection method and device, and a readable storage medium, so as to reduce the battery detection cost, improve the battery detection efficiency, and improve the applicability of battery detection.

[0005] In a first aspect, the present application provides a battery detection device, comprising: a voltage measurement module, for connecting to a battery to be tested and measuring the open circuit voltage of the battery to be tested; a processor, connected to the voltage measurement module, for obtaining the open circuit voltage; a constant voltage source, connected to the processor, for inputting a test voltage to the battery to be tested under the control of the processor after the battery to be tested has been left to stand for a preset time, wherein the test voltage is the same as the open circuit voltage; a current measurement module, connected to the battery to be tested, for measuring the instantaneous current of the battery to be tested after the test voltage is input; and the processor is also connected to the current measurement module, for obtaining the instantaneous current, and determining the self-discharge characteristics of the battery to be tested based on the instantaneous current and a preset current threshold.

[0006] In this application, compared with the prior art, the detection principle of the constant voltage method is adopted. However, the difference from the existing constant voltage method is that after the constant voltage source inputs the corresponding voltage, the instantaneous current of the battery to be tested is measured. The battery is tested and runs immediately, and there is no need to wait for a long time. This can greatly improve the detection efficiency and save detection time and equipment (detection equipment) costs. In addition, before the constant voltage source inputs the corresponding voltage, the battery to be tested needs to be left still for a preset time. During this resting time, the detection device can continue to connect to other batteries to be tested and perform detection on other batteries to be tested, for example: measuring the open circuit voltage of other batteries to be tested; furthermore, the detection device can be used to detect batches of batteries. Therefore, the detection device can reduce the detection cost of the battery, improve the detection efficiency of the battery, and the applicability of the detection device is good.

[0007] As a possible implementation, the voltage measurement module includes a voltmeter, a first switch, and a first battery access terminal; one end of the first switch is connected to one end of the voltmeter, the other end of the first switch is connected to one end of the first battery access terminal, the battery to be tested is connected to the voltage measurement module via the first battery access terminal, the other end of the voltmeter is connected to the other end of the first battery access terminal, and the voltmeter is connected to the processor; when the battery to be tested is connected to the voltage measurement module via the first battery access terminal, the first switch is closed, so that the voltmeter measures the open circuit voltage of the battery to be tested.

[0008] In the present application, the voltage measurement module includes a voltmeter, a first switch and a first battery access terminal. The first switch and the first battery access terminal can be used to connect and disconnect the battery to be tested; the voltmeter can be used to effectively measure the open circuit voltage of the connected battery to be tested.

[0009] As a possible implementation, the current measurement module includes an ammeter, a second switch, and a second battery access terminal; one end of the ammeter is connected to the processor, the other end of the ammeter is connected to one end of the second switch, the other end of the second switch is connected to the second battery access terminal, and the battery under test is connected to the current measurement module via the second battery access terminal; when the battery under test is connected to the current measurement module via the second battery access terminal, the second switch is closed, so that the ammeter measures the instantaneous current of the battery under test.

[0010] In the present application, the current measurement module includes an ammeter, a second switch and a second battery access terminal. The second switch and the second battery access terminal can be used to connect and disconnect the battery to be tested; the ammeter can be used to effectively and quickly measure the instantaneous current of the connected battery to be tested.

[0011] As a possible implementation, the detection device also includes: a battery scanning module, including: a first battery scanning module connected to the voltage measurement module, and a second battery scanning module connected to the current measurement module, the first battery scanning module and the second battery scanning module are both connected to the processor; the first battery scanning module is used to determine the identification of the battery to be tested and send it to the processor when the battery to be tested is connected to the voltage measurement module; the processor is specifically used to obtain the open circuit voltage corresponding to the identification of the battery to be tested; control the constant voltage source to input the test voltage corresponding to the identification of the battery to be tested to the battery to be tested; the second battery scanning module is used to determine the identification of the battery to be tested and send it to the processor when the battery to be tested is connected to the current measurement module; the processor is specifically used to: obtain the instantaneous current corresponding to the identification of the battery to be tested, and determine the self-discharge characteristics of the battery to be tested according to the instantaneous current corresponding to the identification of the battery to be tested and a preset current threshold.

[0012] In the present application, the detection device is also provided with a battery scanning module, including: a first battery scanning module and a second battery scanning module. The first battery scanning module can match the open circuit voltage of the battery to be tested with the identifier, and then the processor can control the constant voltage source to input the test voltage corresponding to the identifier; the second battery scanning module can match the instantaneous current of the battery to be tested with the identifier, and then the processor can determine the self-discharge characteristics of the battery based on the instantaneous current corresponding to the identifier. Furthermore, when the detection device is testing a batch of batteries to be tested, it can effectively distinguish (identify) the open circuit voltage and instantaneous current corresponding to each battery to be tested, thereby achieving effective detection of the batch of batteries to be tested.

[0013] As a possible implementation, the processor is specifically configured to: if the instantaneous current is greater than the preset current threshold, determine that the battery to be tested is an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, determine that the battery to be tested is a normal self-discharge product.

[0014] In the present application, if the instantaneous current is greater than the preset current threshold, it can be determined that the battery to be tested is an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, it can be determined that the battery to be tested is a normal self-discharge product; thus, accurate judgment of the battery's self-discharge performance is achieved.

[0015] As a possible implementation, the detection device further includes a delivery device connected to the processor; the processor is further configured to: if it is determined that the battery to be tested is a product with abnormal self-discharge, control the delivery device to deliver the battery to be tested to a first position; if it is determined that the battery to be tested is a product with normal self-discharge, control the delivery device to deliver the battery to be tested to a second position.

[0016] In the present application, after determining the test results of the battery to be tested, the battery to be tested may be placed in different locations based on different test results to achieve further processing of the tested battery.

[0017] In a second aspect, the present application provides a battery detection method, comprising: measuring the open circuit voltage of a battery to be tested; inputting a test voltage to the battery to be tested after the battery to be tested has been left to stand for a preset time, the test voltage being the same as the open circuit voltage; measuring the instantaneous current of the battery to be tested after the test voltage is input; and determining the self-discharge performance of the battery to be tested based on the instantaneous current and a preset current threshold.

[0018] In this application, compared with the prior art, the detection principle of the constant voltage method is still adopted. However, the difference from the existing constant voltage method is that after the test voltage is input, the instantaneous current of the battery to be tested is measured. The battery to be tested can be tested immediately without waiting for a long time, which can greatly improve the detection efficiency and save detection time and equipment (detection equipment) costs. In addition, before the test voltage is input, the battery to be tested needs to be left to stand for a preset time. During this standing time, other batteries to be tested can be tested, for example, the open circuit voltage of other batteries to be tested can be measured; thus, the detection method can be used to detect batches of batteries. Therefore, the detection method can reduce the detection cost of batteries, improve the detection efficiency of batteries, and the applicability of the detection method is good.

[0019] As a possible implementation, determining the self-discharge performance of the battery to be tested based on the instantaneous current and a preset current threshold includes: if the instantaneous current is greater than the preset current threshold, determining that the battery to be tested is an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, determining that the battery to be tested is a normal self-discharge product.

[0020] In the present application, if the instantaneous current is greater than the preset current threshold, it can be determined that the battery to be tested is an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, it can be determined that the battery to be tested is a normal self-discharge product; thus, accurate judgment of the battery's self-discharge performance is achieved.

[0021] As a possible implementation, the detection method further includes: if it is determined that the battery to be tested is an abnormal self-discharge product, placing the battery to be tested at a first position; if it is determined that the battery to be tested is a normal self-discharge product, placing the battery to be tested at a second position.

[0022] In the present application, after determining the test result of the battery to be tested, the battery to be tested may be placed in different locations based on different test results to achieve further processing of the battery to be tested.

[0023] As a possible implementation manner, the detection method is applied to the battery detection device described in the first aspect and any possible implementation manner of the first aspect.

[0024] In the present application, by combining the battery detection device and the battery detection method, the battery detection cost is reduced, the battery detection efficiency is improved, and the applicability of the battery detection device and the battery detection method is good.

[0025] In a third aspect, the present application provides a battery detection device, comprising: functional modules for implementing the battery detection method described in the second aspect and any possible implementation manner of the second aspect.

[0026] In a fourth aspect, the present application provides a readable storage medium having a computer program stored thereon. When the computer program is executed by a computer, the battery detection method as described in the second aspect and any possible implementation of the second aspect is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0028] Figure 1 is a flow chart of a battery detection method disclosed in one embodiment of the present application;

[0029] Figure 2 1 is a schematic structural diagram of a first detection device for a battery disclosed in an embodiment of the present application;

[0030] Figure 3 1 is a schematic structural diagram of a first detection device for a battery disclosed in another embodiment of the present application;

[0031] Figure 4 This is a schematic structural diagram of a first detection device for a battery disclosed in another embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of the second detection device of the battery disclosed in one embodiment of the present application

[0033] In the drawings, the drawings are not drawn to scale.

[0034] Marking description: 200 - first detection device; 210 - voltage measurement module; 220 - processor; 230 - constant voltage source; 240 - current measurement module; 250 - first battery scanning module; 260 - second battery scanning module; 500 - second detection device; 510 - measurement module; 520 - processing module. DETAILED DESCRIPTION

[0035] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0037] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] Cell self-discharge can cause battery failures during storage, such as low voltage or zero voltage. During battery assembly, poor self-discharge consistency across a batch of cells can lead to safety issues like overcharging and over-discharging, ultimately reducing the life of the battery module. Therefore, battery self-discharge performance is a key determinant of battery quality, and self-discharge testing has become a key component of battery quality testing.

[0039] The applicant analyzed existing battery testing methods and found that, in constant voltage testing methods, after connecting to a constant voltage source, it is necessary to wait for the battery charging current to stabilize before sampling the stable charging current. This results in long-term occupancy of the testing equipment channel, resulting in low detection efficiency.

[0040] Based on the above problems, the applicant has found through research that if the constant voltage detection principle is adopted and the stable charging current is not collected, there is no need to wait for the battery charging current to stabilize. That is, the long-term occupation of the detection equipment channel can be reduced by measuring the instantaneous current of the battery.

[0041] To ensure that the instantaneous current reflects the battery's self-discharge performance, the battery's open-circuit voltage can be tested first. Due to battery self-discharge, after a preset period of time, the battery voltage drops below the open-circuit voltage. When the same test voltage as the open-circuit voltage is applied again, the resulting instantaneous current and instantaneous voltage difference correspond to each other. Therefore, the instantaneous current can reflect the battery's self-discharge performance. This method not only allows for self-discharge performance testing but also avoids long-term occupancy of the testing equipment channels.

[0042] Based on the principles of the above technical solution, the applicant further considered and discovered that after measuring the open-circuit voltage of a battery, there is a preset waiting period. During this waiting period, the battery can be left to rest. While the currently measured battery is resting, the component measuring the open-circuit voltage is idle. The idle period can be used to continue testing the open-circuit voltage of the next battery to be measured, and so on. Therefore, this detection method can also be used to test batches of batteries, greatly improving test efficiency while greatly saving test time and testing equipment costs.

[0043] The technical solution provided in the embodiments of the present application can be applied to various application scenarios where the self-discharge performance of batteries needs to be tested. It can be used to test the self-discharge performance of a small number of batteries, as well as to test the self-discharge performance of a large number of batteries.

[0044] The technical solutions provided in the embodiments of this application include: a battery detection method and a battery detection device. The battery detection method can be applied to the battery detection device, that is, the battery detection device serves as the hardware operating environment for the battery detection method; the battery detection method can also be applied to other battery detection devices. Therefore, to facilitate understanding of the technical solutions provided in the embodiments of this application, in the subsequent embodiments, the battery detection method will be introduced first, followed by the battery detection device.

[0045] Please refer to Figure 1 , is a flow chart of a battery detection method provided in an embodiment of the present application, the detection method comprising:

[0046] Step 110: Measure the open circuit voltage of the battery under test.

[0047] Step 120: After the battery to be tested has been at rest for a preset time, a test voltage is input to the battery to be tested. The test voltage is the same as the open circuit voltage.

[0048] Step 130: Measure the instantaneous current of the battery to be tested after the test voltage is input.

[0049] Step 140: Determine the self-discharge performance of the battery to be tested according to the instantaneous current and a preset current threshold.

[0050] In the embodiment of the present application, the detection principle of the constant voltage method is adopted. However, the difference from the existing constant voltage method is that after the test voltage is input, the instantaneous current of the battery to be tested is measured. The battery to be tested can be tested immediately without waiting for a long time, which can greatly improve the detection efficiency and save detection time and equipment (detection equipment) costs. In addition, before the test voltage is input, the battery to be tested needs to be left to stand for a preset time. During this standing time, other batteries to be tested can be tested, for example, the open circuit voltage of other batteries to be tested can be measured; thus, the detection method can be used to detect batches of batteries. Therefore, the detection method can reduce the detection cost of the battery, improve the detection efficiency of the battery, and the applicability of the detection method is good.

[0051] Next, the detailed implementation of the detection method is introduced.

[0052] In step 110, the open circuit voltage of the battery under test is first measured. It is understood that the terminal voltage of a battery in the open circuit state is called the open circuit voltage. The open circuit voltage of a battery is equal to the difference between the electrode potentials of the positive electrode and the negative electrode when the battery is disconnected (i.e., when no current flows through the two electrodes).

[0053] Therefore, when measuring the open circuit voltage, first disconnect the battery to be tested, and then directly measure the voltage between the positive and negative electrodes of the battery to be tested, which is the open circuit voltage.

[0054] Open circuit voltage can be measured using a voltmeter. In practical applications, the two measurement ports of the voltmeter can be connected. When measurement is required, the positive and negative terminals of the battery under test can be connected to the two measurement ports to effectively measure the open circuit voltage of the battery under test.

[0055] After measuring the open circuit voltage of the battery in step 110 , the battery to be tested is first allowed to stand for a preset time. Then, in step 120 , a test voltage equal to the open circuit voltage is input to the battery to be tested.

[0056] The preset time can be set according to the actual working condition of the battery. Generally speaking, if the battery needs to drain a large amount of electricity, the preset time can be set longer to ensure sufficient draining. If the battery needs to drain a small amount of electricity, the preset time can be set shorter to ensure sufficient draining.

[0057] In addition to presetting the time based on the leakage amount, the preset time can also be set in combination with the actual battery data such as the battery capacity and the maximum potential, which is not limited in the embodiments of the present application.

[0058] For example, the preset time can be set within the time range of 10 minutes to 6 hours.

[0059] In step 120 , the battery to be tested may be connected to a voltage source having the same voltage as the open circuit voltage, so as to input a test voltage having the same voltage as the open circuit voltage.

[0060] After the test voltage is input in step 120 , a corresponding current will flow through the two electrodes of the battery to be tested. At this time, step 130 may be executed to measure the instantaneous current of the battery to be tested after the test voltage is input.

[0061] For instantaneous current, after the test voltage is input to the battery to be tested, the battery to be tested is immediately connected to the ammeter. After the connection is established, the instantaneous value measured by the ammeter is the instantaneous current.

[0062] It can be understood that due to the self-discharge of the battery, after a preset time, the battery voltage is lower than the open circuit voltage. When the test voltage equal to the open circuit voltage is connected again, the instantaneous current generated at this time corresponds to the instantaneous voltage difference. Therefore, the instantaneous current can reflect the self-discharge performance of the battery.

[0063] Furthermore, after the instantaneous current is measured in step 130 , in step 140 , the self-discharge performance of the battery to be tested is determined according to the instantaneous current and a preset current threshold.

[0064] The preset current threshold can be set based on pre-tests. As an optional implementation, a batch of batteries with normal self-discharge performance are tested in steps 110-130 to measure the distribution of the instantaneous current (i) of the batteries. Based on the distribution, the compensation current threshold imax corresponding to the batteries with normal self-discharge is calculated. The compensation current threshold imax can then be determined as the preset current threshold.

[0065] For example, the value of imax can be greater than or equal to μ + (3 to 6) δ. The specific value can be set based on the actual defect interception requirements (such as the interception requirements of batteries with abnormal self-discharge performance). Where μ and δ represent the mean and standard deviation of the i value calculated from the normal distribution of the i value of a batch of batteries, respectively.

[0066] In addition to being set by the above-mentioned setting method, the preset current threshold can also be set by other setting methods, for example: setting by a large amount of empirical data; setting by the requirements of some manufacturers, etc., which is not limited in the embodiments of the present application.

[0067] Based on a preset current threshold, as an optional implementation, step 140 includes: if the instantaneous current is greater than the preset current threshold, determining that the battery to be tested is an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, determining that the battery to be tested is a normal self-discharge product.

[0068] In this embodiment, if the instantaneous current is greater than a preset current threshold, the battery to be tested can be determined to be an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, the battery to be tested can be determined to be a normal self-discharge product, thereby achieving accurate judgment of the battery's self-discharge performance.

[0069] It can be seen from the introduction of the implementation of steps 110 to 140 that during the entire battery testing process, the battery to be tested needs to be left to stand for a period of time. Based on this testing method, the testing method can be applied to batch battery testing.

[0070] For example, assuming the batteries to be tested include Battery 1, Battery 2, Battery 3, and more, after Battery 1 completes its open-circuit voltage measurement, Battery 1 is allowed to rest; at this point, the open-circuit voltage of Battery 2 can be measured, and then Battery 2 is allowed to rest; Battery 1 and Battery 2 can be allowed to rest separately; then the open-circuit voltage of Battery 3 is measured, and after that, Battery 3 is allowed to rest. Because Battery 1, Battery 2, and Battery 3 start resting at different times, after Battery 1 finishes resting, a test voltage can be input to it and its instantaneous current measured; then Battery 2 and Battery 3 are measured. Furthermore, while Battery 1, Battery 2, and Battery 3 are each measuring their instantaneous current, the open-circuit voltage of the other batteries can also be measured simultaneously, and these processes do not conflict.

[0071] Furthermore, during the entire process, battery measurements are taken immediately, and the individual batteries' resting positions do not affect each other. Therefore, this testing method enables efficient testing of batches of batteries.

[0072] Since this detection method can detect batches of batteries, and the time points for measuring the open circuit, inputting the test voltage, and measuring the instantaneous current of the batch of batteries are separate, in order to avoid data confusion, the measured open circuit voltage and instantaneous current can also be added with corresponding labels.

[0073] Therefore, as an optional implementation, after measuring the open-circuit voltage of the battery under test in step 110, the open-circuit voltage is associated with the identifier of the battery under test. For example, if the battery under test is battery 1, the identifier of the battery under test can be the serial number of battery 1. Furthermore, in step 120, when a battery requiring a test voltage is connected, the battery identifier is first identified, and then the open-circuit voltage corresponding to the battery identifier is used as the test voltage.

[0074] After measuring the instantaneous current in step 130, the instantaneous current is associated with the identification of the battery to be tested. Furthermore, in step 140, when determining the self-discharge performance of the battery, the determined self-discharge performance is associated with the battery corresponding to the battery identification corresponding to the instantaneous current.

[0075] In an embodiment of the present application, if the detection method is applied in an application scenario such as a battery production factory, after determining the self-discharge performance of the battery, the battery can be further processed directly.

[0076] Therefore, as an optional embodiment, the detection method further includes: if the battery to be tested is determined to be an abnormal self-discharge product, placing the battery to be tested at the first position; if the battery to be tested is determined to be a normal self-discharge product, placing the battery to be tested at the second position.

[0077] In this embodiment, the first position may be a preset placement position for abnormal self-discharge products; and the second position may be a preset placement position for normal self-discharge products.

[0078] In some embodiments, placing the battery to be tested at a first position includes placing the battery to be tested at the first position using a battery placing device, and placing the battery to be tested at a second position includes placing the battery to be tested at the second position using a battery placing device.

[0079] The battery delivery device may be a device such as a robotic arm or a conveyor belt that can transfer the battery position, and is not limited in the embodiments of the present application. Based on this embodiment of the battery delivery device, a control instruction for the battery delivery device may be generated based on the detection results, and then the control instruction may be sent to the battery delivery device so that the battery delivery device transfers the battery to the corresponding position according to the control instruction.

[0080] In the embodiment of the present application, after determining the test result of the battery to be tested, the battery to be tested may be placed at a corresponding position based on different test results to achieve further processing of the battery to be tested.

[0081] As described in the aforementioned embodiment, the aforementioned battery detection method can be implemented using a corresponding battery detection device. Therefore, in an embodiment of the present application, a battery detection device is also provided, which can be used to implement the aforementioned battery detection method.

[0082] Please refer to the following Figure 2 , which is a structural diagram of the first detection device 200 of the battery provided in an embodiment of the present application. The first detection device 200 can be understood as the hardware environment corresponding to the aforementioned battery detection method, including: a voltage measurement module 210, a processor 220, a constant voltage source 230 and a current measurement module 240.

[0083] The voltage measurement module 210 is used to connect to the battery to be tested and measure the open circuit voltage of the battery to be tested.

[0084] The processor 220 is connected to the voltage measurement module 210 and is used to obtain the open circuit voltage measured by the voltage measurement module 210 .

[0085] The constant voltage source 230 is connected to the processor 220 and is used to control the processor 220 to input a test voltage equal to the open circuit voltage to the battery under test after the battery under test has been at rest for a preset time.

[0086] The current measurement module 240 is connected to the battery to be tested and is used to measure the instantaneous current of the battery to be tested after the voltage to be tested is input.

[0087] The processor 220 is also connected to the current measurement module 240 and is further configured to obtain the instantaneous current measured by the current measurement module 240 and determine the self-discharge characteristic of the battery to be tested based on the instantaneous current and a preset current threshold.

[0088] The various connection relationships described above can be electrical connections or communication connections. The specific connection method can be selected in combination with the actual application scenario and is not limited in the embodiments of this application.

[0089] Processor 220 can be an integrated circuit chip with signal processing capabilities. Processor 220 can be a general-purpose processor, including a CPU (Central Processing Unit), NP (Network Processor), etc.; it can also be a digital signal processor, an application-specific integrated circuit, an off-the-shelf programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. A general-purpose processor can be a microprocessor, or processor 220 can also be any conventional processor.

[0090] The constant voltage source 230 can be a conventional voltage source, such as a DC power supply. The voltage source size of the constant voltage source 230 must correspond to the open circuit voltage of the battery under test. After the processor 220 obtains the open circuit voltage, it can control the test voltage provided by the constant voltage source 230.

[0091] In some embodiments, the constant voltage source 230 can switch between different voltage sources, and switches the corresponding voltage source based on the control instruction of the processor 220.

[0092] In other embodiments, the constant voltage source 230 may include voltage sources of different sizes. After the processor 220 obtains the open circuit voltage, the voltage source corresponding to the open circuit voltage is selected as the input voltage source of the test voltage.

[0093] In the embodiment of the present application, the detection principle of the constant voltage method is adopted, but the difference from the existing constant voltage method is that after the constant voltage source 230 inputs the corresponding voltage, the instantaneous current of the battery to be tested is measured. The battery is tested and runs immediately, and there is no need to wait for a long time. This can greatly improve the detection efficiency and save detection time and equipment (detection equipment) costs. In addition, before the constant voltage source 230 inputs the corresponding voltage, the battery to be tested needs to be left to stand for a preset time. During this standing time, the detection device can continue to connect to other batteries to be tested and perform detection on other batteries to be tested, for example, measuring the open circuit voltage of other batteries to be tested; furthermore, the detection device can be used to detect batches of batteries. Therefore, the detection device can reduce the detection cost of the battery, improve the detection efficiency of the battery, and the applicability of the detection device is good.

[0094] The voltage measurement module 210 is used to measure the voltage. As an optional embodiment, the voltage measurement module 210 includes: a voltmeter, a first switch, and a first battery access terminal.

[0095] One end of the first switch is connected to one end of the voltmeter, the other end of the first switch is connected to one end of the first battery access terminal, the battery to be tested is connected to the voltage measurement module 210 through the first battery access terminal, the other end of the voltmeter is connected to the other end of the first battery access terminal, and the voltmeter is connected to the processor 220; when the battery to be tested is connected to the voltage measurement module 210 through the first battery access terminal, the first switch is closed so that the voltmeter measures the open circuit voltage of the battery to be tested.

[0096] In addition to the above-mentioned implementation, the voltage measurement module 210 may also adopt other implementations. For example, the above-mentioned voltmeter may be implemented by other voltage acquisition modules, which is not limited in the embodiment of the present application.

[0097] In this embodiment, the voltage measurement module 210 includes a voltmeter, a first switch, and a first battery access terminal. The first switch and the first battery access terminal can be used to connect and disconnect the battery to be tested; the voltmeter can be used to effectively measure the open circuit voltage of the connected battery to be tested.

[0098] The current measurement module 240 is used to measure the instantaneous current. As an optional embodiment, the current measurement module 240 includes: an ammeter, a second switch, and a second battery access terminal.

[0099] One end of the ammeter is connected to the processor 220, the other end of the ammeter is connected to one end of the second switch, the other end of the second switch is connected to the second battery access terminal, and the battery to be tested is connected to the current measurement module 240 through the second battery access terminal; when the battery to be tested is connected to the current measurement module 240 through the second battery access terminal, the second switch is closed so that the ammeter measures the instantaneous current of the battery to be tested.

[0100] In addition to the above-mentioned implementation, the current measurement module 240 may also adopt other implementations. For example, the above-mentioned ammeter may be implemented by other current acquisition modules, which is not limited in the embodiment of the present application.

[0101] In this embodiment, the current measurement module 240 includes an ammeter, a second switch and a second battery access terminal. The second switch and the second battery access terminal can be used to connect and disconnect the battery to be tested; the ammeter can be used to effectively and quickly measure the instantaneous current of the connected battery to be tested.

[0102] It can be seen from the introduction of the implementation of the first detection device 200 that during the entire battery detection process, the battery to be tested needs to be left still for a period of time. Based on this detection method, the first detection device 200 can be applied to batch battery detection.

[0103] For example, assume the batteries to be tested include Battery 1, Battery 2, Battery 3, and more. After the voltage measurement module 210 completes measuring the open-circuit voltage of Battery 1, Battery 1 is disconnected from the voltage measurement module 210 and allowed to rest. At this point, the voltage measurement module 210 can connect Battery 2 to measure its open-circuit voltage. Battery 2 is then disconnected from the voltage measurement module 210 and allowed to rest. Battery 1 and Battery 2 can each rest. Then, the voltage measurement module 210 connects Battery 3 to measure its open-circuit voltage. After the measurement is completed, Battery 3 is also allowed to rest. Because Battery 1, Battery 2, and Battery 3 begin resting at different times, after Battery 1 finishes resting, the processor 220 controls the constant voltage source 230 to apply a test voltage to Battery 1 and measure its instantaneous current using the current measurement device. Then, the processor 220 controls Battery 2 and Battery 3. Furthermore, while Battery 1, Battery 2, and Battery 3 are each measuring their instantaneous current, the open-circuit voltages of the other batteries can also be measured simultaneously. These processes do not conflict with each other.

[0104] Furthermore, during the entire process, the battery measurements are carried out immediately, and the static positions of the individual batteries will not affect each other. Therefore, the first detection device 200 can efficiently detect batches of batteries.

[0105] Since the detection device can detect batches of batteries, and the time points for measuring the open circuit, inputting the test voltage and measuring the instantaneous current of the batch of batteries are separate, in order to avoid data confusion, the measured open circuit voltage and instantaneous current can also be added with corresponding labels.

[0106] Therefore, as an optional implementation, please refer to Figure 3 The first detection device 200 further includes a battery scanning module, including a first battery scanning module 250 and a second battery scanning module 260. The first battery scanning module 250 is connected to the voltage measurement module 210, the second battery scanning module 260 is connected to the current measurement module 240, and the processor 220 is connected to the first battery scanning module 250 and the second battery scanning module 260, respectively.

[0107] For the first battery scanning module 250, when the battery to be tested is connected to the voltage measurement module 210, the identification of the battery to be tested is determined and sent to the processor 220; the processor 220 obtains the open-circuit voltage corresponding to the identification of the battery to be tested; and then, when the test voltage is input, the constant voltage source 230 is controlled to input the test voltage corresponding to the identification of the battery to be tested to the battery to be tested.

[0108] For the second battery scanning module 260, when the battery to be tested is connected to the current measurement module 240, the identification of the battery to be tested is determined and sent to the processor 220; the processor 220 obtains the instantaneous current corresponding to the identification of the battery to be tested; and then, the self-discharge characteristics of the battery to be tested are determined based on the instantaneous current corresponding to the identification of the battery to be tested and a preset current threshold.

[0109] The first battery scanning module 250 and the second battery scanning module 260 may be battery scanning units. Correspondingly, a corresponding barcode or QR code scanning pattern is provided on the battery to be tested. These scanning patterns correspond to the identification (e.g., serial number) of the battery to be tested. The battery scanning unit can determine the identification of the battery to be tested by scanning the scanning pattern on the battery to be tested. For example, the battery scanning unit may correspond to a QR code scanning device, a barcode scanning device, etc.

[0110] It is understandable that after obtaining the battery identification scanned by the first battery scanning module 250 or the second battery scanning module 260, the processor 220 may not apply it immediately. Therefore, the processor 220 also has the function of storing the battery identification so that the battery identification can be matched with the corresponding parameters at any time.

[0111] In this embodiment, the first battery scanning module 250 can be used to associate the open-circuit voltage of the battery under test with the identifier, and the processor 220 can then control the constant voltage source 230 to input the test voltage corresponding to the identifier. The second battery scanning module 260 can be used to associate the instantaneous current of the battery under test with the identifier, and the processor 220 can then determine the self-discharge characteristics of the battery based on the instantaneous current corresponding to the identifier. Furthermore, when the detection device is used to test a batch of batteries under test, it can effectively distinguish (identify) the open-circuit voltage and instantaneous current corresponding to each battery under test, thereby achieving effective testing of the batch of batteries under test.

[0112] Furthermore, in combination with the introduction of the aforementioned battery detection method, for the processor 220, when determining the self-discharge performance, if the instantaneous current is greater than the preset current threshold, the battery to be tested is determined to be an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, the battery to be tested is determined to be a normal self-discharge product.

[0113] The implementation of the preset current threshold value is described in the aforementioned embodiment and will not be repeated here.

[0114] In an embodiment of the present application, if the instantaneous current is greater than a preset current threshold, it can be determined that the battery to be tested is an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, it can be determined that the battery to be tested is a normal self-discharge product; thereby achieving accurate judgment of the battery's self-discharge performance.

[0115] In conjunction with the description of the aforementioned embodiment, the first detection device 200 may further include a placement device connected to the processor 220. The processor 220 controls the placement device to place the battery under test at a first position if the battery under test is determined to have abnormal self-discharge; and controls the placement device to place the battery under test at a second position if the battery under test is determined to have normal self-discharge.

[0116] Among them, the implementation method of the delivery device and the implementation method of the control are described in the above embodiments and will not be repeated here.

[0117] In an embodiment of the present application, after determining the test result of the battery to be tested, the battery to be tested may be placed in different locations based on different test results to achieve further processing of the tested battery.

[0118] Combined with the introduction of the implementation methods of each module above, please refer to Figure 4 , is a structural diagram of the first detection device 200 provided in an embodiment of the present application in practical application, Figure 4 In the figure, module 1 corresponds to the voltage measurement module 210, module 2 corresponds to the current measurement module 240, the battery scanning unit corresponds to the battery scanning module, port 3 corresponds to the aforementioned first battery access terminal, port 1 corresponds to the aforementioned second battery access terminal, and port 2 can be understood as the battery access terminal of the battery scanning module corresponding to the current measurement module 240, and the DC power supply corresponds to the constant voltage source 230.

[0119] pass Figure 4 In the structure shown, when performing battery testing, the processor 220 controls the connection between each port and the battery to be tested and the ports, controls the closing and opening of each switch, controls the opening and closing of the constant voltage source 230, and stores and processes the acquired data to determine the final self-discharge performance test result.

[0120] Based on the same invention concept, please refer to Figure 5 In an embodiment of the present application, a second battery detection device 500 is also provided. The second detection device 500 can be understood as a virtual device corresponding to the aforementioned battery detection method. The second detection device includes: a measurement module 510 and a processing module 520.

[0121] The measurement module 510 is configured to measure the open-circuit voltage of the battery under test. The processing module 520 is configured to input a test voltage to the battery under test after the battery under test has been allowed to rest for a preset period of time, where the test voltage is equal to the open-circuit voltage. The measurement module 510 is also configured to measure the instantaneous current of the battery under test after the test voltage is input; the processing module 520 is also configured to determine the self-discharge performance of the battery under test based on the instantaneous current and a preset current threshold.

[0122] In the embodiment of the present application, the processing module 520 is specifically used to: if the instantaneous current is greater than the preset current threshold, determine that the battery to be tested is an abnormal self-discharge product; if the instantaneous current is less than or equal to the preset current threshold, determine that the battery to be tested is a normal self-discharge product.

[0123] In the embodiment of the present application, the processing module 520 is further configured to: if the battery to be tested is determined to be a product with abnormal self-discharge, place the battery to be tested at a first position; if the battery to be tested is determined to be a product with normal self-discharge, place the battery to be tested at a second position.

[0124] The second detection device 500 corresponds to the aforementioned battery detection method, and each functional module corresponds to each step of the method. Therefore, the implementation of each functional module refers to the implementation of each step and will not be repeated here.

[0125] Based on the same inventive concept, an embodiment of the present application provides a readable storage medium having a computer program stored thereon. When the computer program is executed by a computer, the battery detection method as described in the aforementioned embodiment is executed.

[0126] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery detection device, characterized in that: include: A voltage measurement module is used to connect to the battery to be tested and measure the open circuit voltage of the battery to be tested; a processor, connected to the voltage measurement module, and configured to obtain the open circuit voltage; a constant voltage source connected to the processor, and configured to input a test voltage to the battery under test under the control of the processor after the battery under test has been allowed to rest for a preset time, wherein the test voltage is the same as the open circuit voltage; a current measurement module, connected to the battery to be tested, and configured to measure the instantaneous current of the battery to be tested after the test voltage is input; as well as The processor is further connected to the current measurement module, and is configured to obtain the instantaneous current and determine the self-discharge characteristic of the battery to be tested according to the instantaneous current and a preset current threshold.

2. The detection device according to claim 1, characterized in that The voltage measurement module includes a voltmeter, a first switch and a first battery access terminal; One end of the first switch is connected to one end of the voltmeter, the other end of the first switch is connected to one end of the first battery access terminal, the battery to be tested is connected to the voltage measurement module through the first battery access terminal, the other end of the voltmeter is connected to the other end of the first battery access terminal, and the voltmeter is connected to the processor; When the battery to be tested is connected to the voltage measurement module through the first battery access terminal, the first switch is closed, so that the voltmeter measures the open circuit voltage of the battery to be tested.

3. The detection device according to claim 1, characterized in that The current measurement module includes an ammeter, a second switch and a second battery access terminal; One end of the ammeter is connected to the processor, the other end of the ammeter is connected to one end of the second switch, the other end of the second switch is connected to the second battery access terminal, and the battery to be tested is connected to the current measurement module through the second battery access terminal; When the battery to be tested is connected to the current measurement module through the second battery access terminal, the second switch is closed, so that the ammeter measures the instantaneous current of the battery to be tested.

4. The detection device according to claim 1, characterized in that The detection device further includes: a battery scanning module, including: a first battery scanning module connected to the voltage measuring module, and a second battery scanning module connected to the current measuring module, wherein the first battery scanning module and the second battery scanning module are both connected to the processor; The first battery scanning module is used to determine the identification of the battery to be tested and send it to the processor when the battery to be tested is connected to the voltage measurement module; the processor is specifically used to obtain the open circuit voltage corresponding to the identification of the battery to be tested; and control the constant voltage source to input a test voltage corresponding to the identification of the battery to be tested to the battery to be tested; The second battery scanning module is used to determine the identification of the battery to be tested and send it to the processor when the battery to be tested is connected to the current measurement module; the processor is specifically used to: obtain the instantaneous current corresponding to the identification of the battery to be tested, and determine the self-discharge characteristics of the battery to be tested based on the instantaneous current corresponding to the identification of the battery to be tested and a preset current threshold.

5. The detection device according to any one of claims 1 to 4, characterized in that: The processor is specifically configured to: If the instantaneous current is greater than the preset current threshold, it is determined that the battery to be tested is a self-discharging abnormal product; If the instantaneous current is less than or equal to the preset current threshold, it is determined that the battery to be tested is a normal self-discharging product.

6. The detection device according to claim 5, characterized in that The detection device further includes a delivery device, which is connected to the processor; the processor is further configured to: If it is determined that the battery to be tested is a self-discharging abnormal product, controlling the delivery device to deliver the battery to be tested to a first position; If it is determined that the battery to be tested is a normal self-discharging product, the placing device is controlled to place the battery to be tested to a second position.

7. A battery detection method, characterized in that: include: Measure the open circuit voltage of the battery under test; After the battery to be tested has been at rest for a preset time, inputting a test voltage to the battery to be tested, wherein the test voltage is the same as the open circuit voltage; Measuring the instantaneous current of the battery to be tested after the test voltage is input; The self-discharge performance of the battery to be tested is determined according to the instantaneous current and a preset current threshold.

8. The detection method according to claim 7, characterized in that The determining the self-discharge performance of the battery to be tested according to the instantaneous current and a preset current threshold includes: If the instantaneous current is greater than the preset current threshold, it is determined that the battery to be tested is a self-discharging abnormal product; If the instantaneous current is less than or equal to the preset current threshold, it is determined that the battery to be tested is a normal self-discharging product.

9. The detection method according to claim 8, characterized in that The detection method further comprises: If it is determined that the battery to be tested is a self-discharging abnormal product, the battery to be tested is placed in a first position; If it is determined that the battery to be tested is a normal self-discharging product, the battery to be tested is placed in a second position.

10. The detection method according to any one of claims 7 to 9, characterized in that: The detection method is applied to the battery detection device according to any one of claims 1 to 6.

11. A battery detection device, characterized in that: include: A measurement module, used to measure the open circuit voltage of the battery under test; a processing module, configured to input a test voltage to the battery to be tested after the battery to be tested has been at rest for a preset time, wherein the test voltage is the same as the open circuit voltage; The measuring module is further used to measure the instantaneous current of the battery to be tested after the test voltage is input; The processing module is further configured to determine the self-discharge performance of the battery to be tested according to the instantaneous current and a preset current threshold.

12. The detection device according to claim 11, characterized in that: The processing module is specifically used for: If the instantaneous current is greater than the preset current threshold, it is determined that the battery to be tested is a self-discharging abnormal product; If the instantaneous current is less than or equal to the preset current threshold, it is determined that the battery to be tested is a normal self-discharging product.

13. The detection device according to claim 12, characterized in that: The processing module is further configured to: If it is determined that the battery to be tested is a self-discharging abnormal product, the battery to be tested is placed in a first position; If it is determined that the battery to be tested is a normal self-discharging product, the battery to be tested is placed in a second position.

14. A readable storage medium, characterized in that The readable storage medium stores a computer program, and when the computer program is executed by a computer, the battery detection method according to any one of claims 7 to 9 is executed.

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