Method and device for identifying copper-separated battery cell and electronic equipment

Abstract

The invention discloses a method and a device for identifying a copper separation battery cell and electronic equipment, the method is applied to the technical field of battery cells, and the method comprises the following steps: acquiring a to-be-tested battery cell, and testing the to-be-tested battery cell by adopting preset target equipment to obtain resistance information of the to-be-tested battery cell and voltage information of the to-be-tested battery cell; charging the to-be-tested battery cell according to the resistance information and the voltage information of the to-be-tested battery cell; collecting battery cell information of the to-be-tested battery cell in the charging process, and calculating current acceleration information of the to-be-tested battery cell in the charging process based on the battery cell information; and according to the current speed increase information and the cell information, identifying whether the to-be-tested cell belongs to a copper-separated cell, and obtaining an identification result. Through the battery cell identification method and device, the problem that the battery cell is damaged due to the fact that the battery cell needs to be disassembled in the process of identifying that the battery cell belongs to the copper precipitation battery cell in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of battery cell technology, and in particular to a method, device and electronic equipment for identifying copper-deposited battery cells. Background Art

[0002] In the field of lithium-ion batteries, copper precipitation is a common battery failure mode, especially when the battery is over-discharged to a voltage below 0V. The root cause of this phenomenon is that the copper current collector inside the battery is oxidized and corroded under extreme discharge conditions, and is reduced to elemental copper on the low-potential electrode. These elemental copper particles gradually accumulate and eventually block the battery separator, forming an internal short circuit, causing the battery cell to be unable to charge or discharge normally, and may even cause safety problems such as thermal runaway, causing battery cell necrosis.

[0003] At present, the mainstream method of identifying copper-deposited batteries relies on disassembling the battery, diagnosing by directly observing the color change of the positive electrode (turning to the red area) and using energy dispersive X-ray spectroscopy (EDS) to analyze the elemental composition. However, the disassembly detection method not only destroys the battery structure, making it impossible to further analyze or use it, but also is complicated to operate and needs to be carried out in a specific dust-free and explosion-proof environment to avoid the release of harmful substances and the risk of short circuits. In addition, this method is difficult to apply on a large scale, limiting the efficient screening of a large number of batteries on the production line.

[0004] With regard to the problem that in the process of identifying that a battery cell is a copper-deposited battery cell in the related art, the battery cell needs to be disassembled, resulting in damage to the battery cell, and no effective solution has been proposed so far. Summary of the invention

[0005] The main purpose of the present application is to provide a method, device and electronic device for identifying copper-deposited batteries, so as to solve the problem in the related art that in the process of identifying batteries as copper-deposited batteries, the batteries need to be disassembled, resulting in damage to the batteries.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for identifying a copper-deposited battery cell is provided, the method comprising: obtaining a battery cell to be tested, testing the battery cell to be tested using a preset target device, and obtaining resistance information of the battery cell to be tested and voltage information of the battery cell to be tested; charging the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; collecting the battery cell information of the battery cell to be tested during the charging process, and calculating the current growth rate information of the battery cell to be tested during the charging process based on the battery cell information; identifying whether the battery cell to be tested is a copper-deposited battery cell according to the current growth rate information and the battery cell information, and obtaining an identification result.

[0007] Further, the resistance information includes the resistance value of the battery cell to be tested with respect to the AC signal, and the voltage information includes the voltage information of the battery cell to be tested in a discharged state. The battery cell to be tested is charged according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, including: determining the discharge rate of the battery cell to be tested according to the voltage information of the battery cell to be tested in a discharged state; when the resistance value is greater than or equal to a preset resistance value, and the discharge rate is greater than or equal to a preset discharge rate, determining that the battery cell to be tested has an abnormality, and executing the step of charging the battery cell to be tested; when the resistance value is less than the preset resistance value, or the discharge rate is less than the preset discharge rate, determining that the battery cell to be tested has no abnormality, and ending the identification of the battery cell to be tested.

[0008] Furthermore, charging the battery cell to be tested includes: determining a first current value according to a preset ratio of the battery cell to be tested, and charging the battery cell to be tested according to the first current value until the voltage of the battery cell to be tested reaches a first preset voltage, thereby obtaining the battery cell to be tested after the first charge; charging the battery cell to be tested after the first charge according to the first preset voltage until the current value of the battery cell to be tested reaches a preset current value, thereby obtaining the battery cell to be tested after the second charge; and leaving the battery cell to be tested after the second charge to stand for a first preset time period.

[0009] Furthermore, the cell information of the battery cell to be tested during the charging process is collected, and the current growth rate information of the battery cell to be tested during the charging process is calculated based on the battery cell information, including: in the charging process of charging the battery cell to be tested after the first charging according to the first preset voltage, the moment information and the current value of the battery cell to be tested are collected every second preset time period to obtain the current value corresponding to each moment; the current growth rate of the battery cell to be tested at each moment is calculated according to the moment information, the second preset time period and the current value corresponding to each moment to obtain the current growth rate information of the battery cell to be tested during the charging process.

[0010] Further, the battery cell information includes charging time and charging temperature information, and identifying whether the battery cell to be tested is a copper-deposited battery cell is performed based on the current growth rate information and the battery cell information to obtain an identification result, including: judging whether the battery cell to be tested meets a preset judgment condition based on the current growth rate information, the charging time and the charging temperature information; when the battery cell to be tested meets the preset judgment condition, determining that the battery cell to be tested is a copper-deposited battery cell, and obtaining the identification result; when the battery cell to be tested does not meet the judgment condition, determining that the battery cell to be tested is not a copper-deposited battery, and obtaining the identification result.

[0011] Further, the battery cell information includes battery cell voltage information, and identifying whether the battery cell to be tested is a copper-deposited battery cell based on the current growth rate information and the battery cell information to obtain an identification result includes: determining the battery cell voltage of the battery cell to be tested at each moment in the charging process based on the battery cell voltage information; and determining that the battery cell to be tested is a copper-deposited battery cell when there is no battery cell voltage greater than a second preset voltage in the battery cell voltage at each moment, and obtaining the identification result, wherein the numerical value corresponding to the second preset voltage is smaller than the numerical value corresponding to the first preset voltage.

[0012] Further, judging whether the battery cell to be tested meets a preset judgment condition based on the current growth rate information, the charging time and the charging temperature information includes: determining the current growth rate of the battery cell to be tested at each moment based on the current growth rate information, and determining that the battery cell to be tested meets the first judgment sub-condition when there is a current growth rate at any moment in the current growth rate at each moment that is greater than a first preset value; determining that the battery cell to be tested meets the second judgment sub-condition when the charging time is greater than the preset charging time, wherein the preset charging time represents the result of multiplying the second preset value by the charging time of a normal battery cell; determining the charging temperature of the battery cell to be tested at each moment based on the charging temperature information, and determining that the battery cell to be tested meets the third judgment sub-condition when there is a charging temperature at any moment in the charging temperature at each moment that is greater than the preset temperature; determining that the battery cell to be tested meets the judgment condition when the battery cell to be tested satisfies the first judgment sub-condition, the second judgment sub-condition and the third judgment sub-condition at the same time.

[0013] Furthermore, before charging the battery cell to be tested based on the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, the method also includes: deploying a target device at a preset spatial position, wherein there is a target space inside the target device, and the target device is used to prevent objects in the target space from causing a security threat to the external spatial area of ​​the target device; when the battery cell to be tested is placed in the target space, performing the step of charging the battery cell to be tested.

[0014] In order to achieve the above-mentioned purpose, according to another aspect of the present application, a device for identifying copper-deposited battery cells is provided, and the device includes: a testing unit, used to obtain the battery cell to be tested, and use a preset target device to test the battery cell to be tested to obtain the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; a charging unit, used to charge the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; a calculation unit, used to collect the battery cell information of the battery cell to be tested during the charging process, and calculate the current growth rate information of the battery cell to be tested during the charging process based on the battery cell information; an identification unit, used to identify whether the battery cell to be tested is a copper-deposited battery cell according to the current growth rate information and the battery cell information, and obtain an identification result.

[0015] Further, the resistance information includes the resistance value of the battery cell to be tested with respect to the AC signal, and the voltage information includes the voltage information of the battery cell to be tested in a discharged state. The charging unit includes: a first determination subunit, used to determine the discharge rate of the battery cell to be tested based on the voltage information of the battery cell to be tested in a discharged state; a second determination subunit, used to determine that the battery cell to be tested has an abnormality when the resistance value is greater than or equal to a preset resistance value and the discharge rate is greater than or equal to a preset discharge rate, and execute the step of charging the battery cell to be tested; a third determination subunit, used to determine that the battery cell to be tested has no abnormality when the resistance value is less than the preset resistance value or the discharge rate is less than the preset discharge rate, and end the identification of the battery cell to be tested.

[0016] Further, the charging unit includes: a first charging sub-unit, used to determine a first current value according to a preset ratio of the battery cell to be tested, and charge the battery cell to be tested according to the first current value until the voltage of the battery cell to be tested reaches a first preset voltage, thereby obtaining the battery cell to be tested after the first charge; a second charging sub-unit, used to charge the battery cell to be tested after the first charge according to the first preset voltage, until the current value of the battery cell to be tested reaches a preset current value, thereby obtaining the battery cell to be tested after the second charge; and a standing sub-unit, used to stand the battery cell to be tested after the second charge for a first preset time period.

[0017] Furthermore, the calculation unit includes: a collection subunit, used to collect time information and the current value of the battery cell to be tested every second preset time period during the charging process of the battery cell to be tested after the first charging according to the first preset voltage, so as to obtain the current value corresponding to each moment; a calculation subunit, used to calculate the current growth rate of the battery cell to be tested at each moment based on the time information, the second preset time period and the current value corresponding to each moment, so as to obtain the current growth rate information of the battery cell to be tested during the charging process.

[0018] Furthermore, the battery cell information includes charging time and charging temperature information, and the identification unit includes: a judgment subunit, used to judge whether the battery cell to be tested meets the preset judgment conditions based on the current growth rate information, the charging time and the charging temperature information; a fourth determination subunit, used to determine that the battery cell to be tested is a copper-deposited battery cell when the battery cell to be tested meets the preset judgment conditions, and obtain the identification result; a fifth determination subunit, used to determine that the battery cell to be tested is not a copper-deposited battery when the battery cell to be tested does not meet the judgment conditions, and obtain the identification result.

[0019] Further, the battery cell information includes battery cell voltage information, and the identification unit includes: a sixth determination subunit, used to determine the battery cell voltage of the battery cell to be tested at each moment in the charging process based on the battery cell voltage information; a seventh determination subunit, used to determine that the battery cell to be tested is a copper-deposited battery cell when there is no battery cell voltage greater than a second preset voltage in the battery cell voltages at each moment, and obtain the identification result, wherein the numerical value corresponding to the second preset voltage is smaller than the numerical value corresponding to the first preset voltage.

[0020] Further, the judgment subunit includes: a first determination module, used to determine the current growth rate of the battery cell to be tested at each moment according to the current growth rate information, and determine that the battery cell to be tested meets the first judgment sub-condition when there is a current growth rate at any moment greater than a first preset value in the current growth rate at each moment; a second determination module, used to determine that the battery cell to be tested meets the second judgment sub-condition when the charging time is greater than a preset charging time, wherein the preset charging time represents the result of multiplying the second preset value by the charging time of a normal battery cell; a third determination module, used to determine the charging temperature of the battery cell to be tested at each moment according to the charging temperature information, and determine that the battery cell to be tested meets the third judgment sub-condition when there is a charging temperature at any moment greater than the preset temperature in the charging temperature at each moment; a fourth determination module, used to determine that the battery cell to be tested meets the judgment condition when the battery cell to be tested satisfies the first judgment sub-condition, the second judgment sub-condition and the third judgment sub-condition at the same time.

[0021] Furthermore, the device also includes: a deployment unit, used to deploy a target device at a preset spatial position before charging the battery cell to be tested based on the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, wherein there is a target space inside the target device, and the target device is used to prevent objects in the target space from causing a security threat to the external space area of ​​the target device; an execution unit, used to execute the step of charging the battery cell to be tested when the battery cell to be tested is placed in the target space.

[0022] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a computer program product is provided, including a computer program, which, when executed by a processor, implements the method for identifying copper-deposited battery cells described in any one of the above items, and which, when executed by a processor, implements the steps of the method for identifying copper-deposited battery cells described in each embodiment of the present application.

[0023] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes stored computer instructions, wherein when the computer instructions are executed by a processor, any one of the above-mentioned methods for identifying copper-deposited battery cells is implemented.

[0024] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an electronic device is provided, including one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by one or more processors, the one or more processors implement any of the above-mentioned methods for identifying copper-deposited battery cells.

[0025] Through the present application, the following steps are adopted: obtaining a battery cell to be tested, using a preset target device to test the battery cell to be tested, and obtaining resistance information of the battery cell to be tested and voltage information of the battery cell to be tested; charging the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; collecting battery cell information of the battery cell to be tested during the charging process, and calculating the current growth rate information of the battery cell to be tested during the charging process based on the battery cell information; identifying whether the battery cell to be tested is a copper-deposited battery cell according to the current growth rate information and the battery cell information, and obtaining an identification result, thereby solving the problem in the related art that in the process of identifying that the battery cell is a copper-deposited battery cell, the battery cell needs to be disassembled, resulting in damage to the battery cell.

[0026] By obtaining the resistance information and voltage information of the battery cell to be tested, the risk of copper deposition can be predicted, thereby avoiding unnecessary detailed testing of the battery cell where copper deposition does not occur, thereby improving the identification efficiency. At the same time, by monitoring the charging process and calculating the current growth rate, it is possible to accurately determine whether the battery cell is in a copper deposition state in combination with the detailed battery cell information, thereby achieving the effect of improving the identification accuracy. This not only avoids the safety hazards of the traditional method of requiring the battery cell to be disassembled and tested, but also greatly shortens the identification time. It is suitable for the rapid screening of large quantities of battery cells, thereby achieving the effect of improving the safety, accuracy and efficiency of identifying battery cells, and further achieving the effect of ensuring the quality of the battery cell and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 It is a flow chart of a method for identifying a copper-deposited battery cell provided in Example 1 of the present application;

[0029] Figure 2 This is a schematic diagram of an optional process for identifying whether a battery cell has copper deposition phenomenon according to the first embodiment of the present application;

[0030] Figure 3 is a line graph of current changes of multiple optional cells to be tested during constant voltage charging according to the first embodiment of the present application;

[0031] Figure 4 It is a line graph of voltage change of an optional copper deposition battery cell during charging according to the first embodiment of the present application;

[0032] Figure 5 is a schematic diagram of a device for identifying a copper-deposited battery cell provided in Example 2 of the present application;

[0033] Figure 6 It is a schematic diagram of an electronic device for identifying copper-deposited cells provided in Example 5 of the present application. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] It should be noted that the user information (including but not limited to user device information, user personal information, collected data, used data, generated data, processed data, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, collected information, used information, generated information, processed information, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data are in compliance with the relevant laws, regulations and standards of relevant countries and regions, necessary confidentiality measures are taken, and public order and good morals are not violated, and corresponding operation portals are provided for users to choose to authorize or refuse. For example, an interface is set between this system and relevant users or organizations. Before obtaining relevant information, it is necessary to send an acquisition request to the aforementioned user or organization through the interface, and obtain relevant information after receiving the consent information fed back by the aforementioned user or organization.

[0036] It should be noted that this application provides users with corresponding operation entrances for them to choose to agree or reject the automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Embodiment 1

[0040] The present invention is described below in conjunction with preferred implementation steps. Figure 1 is a flow chart of a method for identifying a copper-deposited battery cell according to the first embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0041] Step S101 , obtaining a battery cell to be tested, using a preset target device to test the battery cell to be tested, and obtaining resistance information and voltage information of the battery cell to be tested.

[0042] In the first embodiment of the present invention, after obtaining the battery cell to be tested, a target device (e.g., an AC internal resistance meter) is used for testing, aiming to preliminarily evaluate the health status of the battery cell to be tested in a non-destructive manner. Through the target device, the resistance information and voltage information of the battery cell to be tested can be accurately collected, wherein the resistance information reflects the internal resistance state of the battery cell, and the voltage information indicates the voltage level of the battery cell when it is at rest, thereby providing key data support for the subsequent non-destructive identification of the copper deposition state.

[0043] Step S102 , charging the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested.

[0044] In the first embodiment of the present invention, it is possible to preliminarily determine whether the cell to be tested has a risk of copper deposition based on the resistance information and voltage information of the cell to be tested. For example, when the resistance value of the cell to be tested is much higher than the standard value, and the voltage information is lower than a specific threshold, it indicates that the cell to be tested may have a risk of copper deposition. At this time, the cell to be tested is tested using a preset charging device, and the various indicator information of the cell to be tested during the charging process, such as current changes, voltage changes, and temperature changes, is closely monitored and collected, so as to further identify whether the cell to be tested is in a copper deposition state, and ensure the accuracy of the identification result.

[0045] Step S103 , collecting cell information of the cell to be tested during the charging process, and calculating current growth rate information of the cell to be tested during the charging process based on the cell information.

[0046] In the first embodiment of the present invention, during the charging process, the cell information such as the voltage, current, and temperature of the cell to be tested is continuously collected. When the cell enters the constant voltage charging stage, the charging current should gradually decrease. If copper deposition occurs in the cell, the current will remain abnormally high or increase in the opposite direction. By analyzing the cell information during the charging process and calculating the current growth rate information of the current changing with time, it is possible to determine whether the cell to be tested is in a copper deposition state based on the current growth rate information, thereby achieving the effect of non-destructive identification of the inside of the cell.

[0047] Step S104, identifying whether the battery cell to be tested is a copper-deposited battery cell according to the current growth rate information and the battery cell information, and obtaining an identification result.

[0048] In the first embodiment of the present invention, by monitoring the current growth rate information during the charging process and combining the battery cell information (for example, current information, temperature information, and charging time information), it is possible to non-destructively identify whether the battery cell is a copper-deposited battery cell, thereby obtaining an identification result, thereby effectively evaluating the safety and health of the battery cell, and achieving the effect of accurately identifying whether the battery cell to be tested is a copper-deposited battery cell on the basis of non-destructive identification.

[0049] In summary, the method for identifying copper-deposited battery cells provided in the first embodiment of the present application obtains the battery cell to be tested, adopts a preset target device to test the battery cell to be tested, and obtains the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; charges the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; collects the battery cell information of the battery cell to be tested during the charging process, and calculates the current growth rate information of the battery cell to be tested during the charging process based on the battery cell information; identifies whether the battery cell to be tested is a copper-deposited battery cell based on the current growth rate information and the battery cell information, and obtains an identification result, which solves the problem in the related art that in the process of identifying that the battery cell is a copper-deposited battery cell, the battery cell needs to be disassembled, resulting in damage to the battery cell.

[0050] By obtaining the resistance information and voltage information of the battery cell to be tested, the risk of copper deposition can be predicted, thereby avoiding unnecessary detailed testing of the battery cell where copper deposition does not occur, thereby improving the recognition efficiency. At the same time, by monitoring the charging process and calculating the current growth rate information, it is possible to accurately determine whether the battery cell is in a copper deposition state in combination with the detailed battery cell information, thereby achieving the effect of improving the recognition accuracy. This not only avoids the safety hazard of the traditional method of requiring the battery cell to be disassembled and tested, but also greatly shortens the recognition time. It is suitable for the rapid screening of large quantities of battery cells, thereby achieving the effect of improving the safety, accuracy and efficiency of identifying battery cells, and further achieving the effect of ensuring the quality of battery cells and reducing production costs.

[0051] Optionally, in the method for identifying copper-deposited battery cells provided in Example 1 of the present application, the resistance information includes the resistance value of the battery cell to be tested with respect to an AC signal, the voltage information includes the voltage information of the battery cell to be tested in a discharged state, and the battery cell to be tested is charged according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, including: determining the discharge rate of the battery cell to be tested according to the voltage information of the battery cell to be tested in a discharged state; when the resistance value is greater than or equal to a preset resistance value, and the discharge rate is greater than or equal to a preset discharge rate, determining that the battery cell to be tested is abnormal, and executing the step of charging the battery cell to be tested; when the resistance value is less than the preset resistance value, or the discharge rate is less than the preset discharge rate, determining that the battery cell to be tested is not abnormal, and ending the identification of the battery cell to be tested.

[0052] In the first embodiment of the present invention, in order to efficiently identify the abnormal condition of the copper deposition battery cell through the resistance information and voltage information of the battery cell, the AC impedance (ACR) of the battery cell to be tested and the open circuit voltage (OCV) of the battery cell to be tested in the discharge state can be obtained through an AC internal resistance meter to judge the health of the battery cell. Among them, the open circuit voltage (OCV) refers to the voltage at both ends of the battery when the external circuit is not connected, reflecting the state of charge of the battery and the balance state of the chemical composition. The AC impedance (ACR) is the impedance measured by applying an AC signal at both ends of the battery, which mainly reflects the resistance characteristics inside the battery, including the impedance of the electrolyte, electrode and diaphragm. The increase in ACR usually indicates changes in the internal structure or chemical state of the battery, such as the increase in internal resistance caused by the copper deposition phenomenon.

[0053] It should be noted that the number of cells to be tested can be one or more. Since the specific conditions of each cell to be tested are different, if there are multiple cells, an AC internal resistance meter is required to perform OCV / ACR tests on each cell to be tested. Among them, the specific parameters during the OCV / ACR test include: resistance accuracy: 0.01mΩ; frequency: AC1KHz voltage range 0~10v. The above parameters can be adjusted according to the cells to be tested in actual production conditions, and are not specifically limited in this embodiment 1.

[0054] Specifically, if the resistance value of the battery cell to be tested exceeds the preset threshold value (i.e., the ACR is abnormally high), presenting a high internal resistance state, and the voltage drop rate of the battery cell to be tested is higher than the standard K value (for example, the voltage drop is 1mv within 1 minute, and the power-off rate is faster in actual production conditions, which is not specifically limited in this embodiment 1), it indicates that there is a risk of copper precipitation inside the battery cell to be tested (i.e., the above-mentioned determination that the battery cell to be tested is abnormal), resulting in degradation of battery cell performance and safety hazards. At this time, the charging step will be performed, and the battery cell information during the charging process will be further monitored to determine whether the battery cell to be tested has copper precipitation.

[0055] The K value is a quantitative indicator of the voltage attenuation coefficient or voltage drop rate, which is used to measure the magnitude of the voltage drop of the battery cell within a specific time interval (e.g. 1 minute), and the unit is usually millivolts per minute (mV / min). A higher K value means that the voltage of the battery cell drops rapidly in a short period of time, indicating that the battery cell is in an abnormal state.

[0056] Through the above steps, it is possible to filter out battery cells without abnormalities, avoid meaningless battery cell detection steps, significantly improve the efficiency of battery cell detection, facilitate rapid screening and fault diagnosis of large quantities of battery cells, improve identification efficiency, and achieve the technical effect of improving battery cell quality and ensuring safe use of battery cells.

[0057] Optionally, in the method for identifying copper-deposited battery cells provided in Example 1 of the present application, charging the battery cell to be tested includes: determining a first current value according to a preset ratio of the battery cell to be tested, and charging the battery cell to be tested according to the first current value until the voltage of the battery cell to be tested reaches a first preset voltage, thereby obtaining the battery cell to be tested after the first charging; charging the battery cell to be tested after the first charging according to the first preset voltage until the current value of the battery cell to be tested reaches the preset current value, thereby obtaining the battery cell to be tested after the second charging; and allowing the battery cell to be tested to stand after the second charging for a first preset time period.

[0058] In the first embodiment of the present invention, the charging process of the battery to be tested is divided into two stages to accurately diagnose whether the battery to be tested has copper precipitation. First, according to the preset ratio of the battery (for example, the preset ratio can be set to 0.2C. If the rated capacity of a battery is 5000mAh (milliampere-hour), the current of 0.2C (also referred to as the rated current EC or cut-off current) is 1000mA), an initial charging current (i.e., the first current value mentioned above) is determined, and the battery to be tested is charged with constant current. This stage lasts until the battery voltage rises to the first preset voltage (for example, 4.2V, also referred to as the cut-off voltage), the charging process of the first stage is completed, and the battery after the first charge is obtained. Subsequently, the second stage, i.e., constant voltage charging, is entered, the battery voltage is maintained at the first preset voltage, and charging continues until the current of the battery to be tested drops to a preset current value (for example, 0.01V, or 0.1V, or any current value in the range of 0.01V to 0.1V, etc., also referred to as the cut-off current), and the battery after the second charge is obtained.

[0059] Finally, the battery cells that have undergone two-stage charging are left to rest for a preset time (e.g., 10 minutes) to allow the electrochemical system inside the battery cells to stabilize, facilitating subsequent nondestructive testing and data collection. After resting, by analyzing the voltage, current changes, and temperature of the battery cells, combined with the current growth rate, it is possible to accurately assess whether the battery cells have copper deposition problems, thus ensuring the quality and safety of the battery cells.

[0060] It should be noted that the above-mentioned first current value, the above-mentioned preset current value and the above-mentioned preset voltage value are determined for a battery cell of a certain model (for example, 18650 / 21700 small cylindrical battery). In actual production activities, they can be flexibly adjusted according to the specific circumstances of the battery cell and are not specifically limited in this embodiment 1.

[0061] By precisely controlling the charging conditions, non-destructive detection of copper deposition in battery cells is achieved, which helps battery production and batch testing and improves the accuracy and efficiency of battery cell identification.

[0062] Optionally, in the method for identifying copper-deposited battery cells provided in Example 1 of the present application, battery cell information of the battery cell to be tested during the charging process is collected, and current growth rate information of the battery cell to be tested during the charging process is calculated based on the battery cell information, including: in the charging process of charging the battery cell to be tested after the first charging according to the first preset voltage, the moment information and the current value of the battery cell to be tested are collected every second preset time period to obtain the current value corresponding to each moment; the current growth rate of the battery cell to be tested at each moment is calculated based on the moment information, the second preset time period and the current value corresponding to each moment to obtain the current growth rate information of the battery cell to be tested during the charging process.

[0063] In the first embodiment of the present invention, in order to identify the copper precipitation problem through real-time monitoring and precise calculation in the battery cell charging test, the current time point (i.e., the above-mentioned moment information) and the current value of the battery cell can be recorded at intervals of the second preset time length (e.g., 30 seconds) during the constant voltage charging process (i.e., the charging process of charging the battery cell to be tested after the first charge according to the first preset voltage) to form a series of time-current data pairs, i.e., the current value corresponding to each moment mentioned above. Then, according to the current value corresponding to each moment, combined with the second preset time length, a mathematical method is used to calculate the rate of increase of the current at each moment, i.e., the above-mentioned current growth rate information.

[0064] The current growth rate information reflects the rate change of the electrochemical reaction inside the battery cell under charging state. For normal batteries, as the charging progresses, the current should gradually decay until the preset small current cut-off condition is met. However, if the battery cell has copper deposition, the current growth rate will show abnormal increase characteristics. This trend is in sharp contrast to normal batteries, and can become an important basis for identifying copper deposition batteries.

[0065] By continuously monitoring and calculating the current growth rate information, it is possible to capture changes in the battery cell status in a timely manner, accurately judge the health status of the battery cell, achieve the effect of non-destructive testing of the battery cell, and improve the safety and accuracy of battery cell identification.

[0066] Optionally, in the method for identifying copper-deposited batteries provided in Example 1 of the present application, the battery cell information includes charging time and charging temperature information, and whether the battery cell to be tested is a copper-deposited battery is identified based on the current growth rate information and the battery cell information to obtain an identification result, including: judging whether the battery cell to be tested meets preset judgment conditions based on the current growth rate information, the charging time and the charging temperature information; if the battery cell to be tested meets the preset judgment conditions, determining that the battery cell to be tested is a copper-deposited battery and obtaining an identification result; if the battery cell to be tested does not meet the judgment conditions, determining that the battery cell to be tested is not a copper-deposited battery and obtaining an identification result.

[0067] In the first embodiment, in order to determine whether the battery cell to be tested has copper deposition, an electrical performance test can be performed on the battery cell to be tested, and a judgment can be made based on the test results, that is, the above-mentioned identification of whether the battery cell to be tested is a copper deposition battery cell based on the current growth rate information and the battery cell information to obtain an identification result. Among them, the specific parameters during the electrical performance test include ambient temperature 25±2°C, relative humidity 15%~90% or ≤70%), atmospheric pressure: 86KPa~106KPa. The above parameters can be flexibly adjusted according to actual production conditions and are not specifically limited in the first embodiment.

[0068] During the charging process, the current growth rate information can be calculated based on the data collected during the charging process, so as to comprehensively analyze the charging time, charging temperature information and current growth rate information of the battery cell, accurately identify the copper deposition battery cell, and thus reflect the dynamic changes of the battery cell charging reaction. When the above three indicators (current growth rate information, charging time, charging temperature information) meet the preset judgment conditions at the same time, it can be determined that the battery cell to be tested is a copper deposition battery cell, and the identification result is obtained; on the contrary, if any indicator does not meet the standard, it is judged that the battery cell is normal and there is no copper deposition phenomenon, and the identification result is obtained.

[0069] Through the above steps, the relationship between electrochemical properties and battery cell status can be fully utilized without physical disassembly, achieving non-destructive and efficient identification of copper-deposited batteries, thereby improving the accuracy and efficiency of battery safety assessment.

[0070] Optionally, in the method for identifying copper-deposited battery cells provided in Example 1 of the present application, the battery cell information includes battery cell voltage information, and whether the battery cell to be tested is a copper-deposited battery cell is identified based on the current growth rate information and the battery cell information to obtain an identification result, including: determining the battery cell voltage of the battery cell to be tested at each moment in the charging process based on the battery cell voltage information; and determining that the battery cell to be tested is a copper-deposited battery cell when there is no battery cell voltage greater than a second preset voltage in the battery cell voltages at each moment, and obtaining an identification result, wherein the numerical value corresponding to the second preset voltage is smaller than the numerical value corresponding to the first preset voltage.

[0071] In the first embodiment, the cell voltage information is the key monitoring data. The voltage information can reveal the change of the electrochemical state inside the cell. Therefore, it can be determined whether the cell to be tested is a copper deposition cell based on the cell voltage information.

[0072] The electrochemical reaction efficiency of the copper-precipitated battery cell is significantly reduced due to the change of the internal structure caused by copper deposition. Even in the constant voltage charging stage, the voltage cannot be normally increased to the expected higher threshold value (i.e., the second preset voltage mentioned above). Therefore, the battery cell voltage data of the time series can be formed by continuously collecting the voltage value of the battery cell during the charging process, that is, the battery cell voltage of the above-mentioned battery cell to be tested at each moment during the charging process. When there is no battery cell voltage greater than the second preset voltage in the battery cell voltage at each moment, it can be judged that the battery cell to be tested is a copper-precipitated battery cell. If the battery cell voltage does not exceed the second preset voltage throughout the charging process, it can be determined that the battery cell to be tested cannot be charged by the charging device, that is, it is determined that the battery cell to be tested belongs to a copper-precipitated battery cell, and the above-mentioned identification result is obtained.

[0073] By dynamically monitoring the battery cell voltage information, it is possible to determine whether the battery cell to be tested is a copper-deposited battery cell when the battery cell to be tested cannot reach the first preset voltage during the charging process, thereby making the method for identifying copper-deposited batteries more complete, achieving the effect of comprehensively and accurately analyzing the battery cell to be tested, and improving the accuracy of identifying copper-deposited batteries.

[0074] Optionally, in the method for identifying copper-deposited battery cells provided in Example 1 of the present application, whether the battery cell to be tested meets the preset judgment condition is judged based on the current growth rate information, the charging time and the charging temperature information, including: determining the current growth rate of the battery cell to be tested at each moment based on the current growth rate information, and determining that the battery cell to be tested meets the first judgment sub-condition when there is a current growth rate at any moment in the current growth rate at each moment that is greater than a first preset value; determining that the battery cell to be tested meets the second judgment sub-condition when the charging time is greater than the preset charging time, wherein the preset charging time represents the result of multiplying the second preset value by the charging time of a normal battery cell; determining the charging temperature of the battery cell to be tested at each moment based on the charging temperature information, and determining that the battery cell to be tested meets the third judgment sub-condition when there is a charging temperature at any moment in the charging temperature at each moment that is greater than the preset temperature; determining that the battery cell to be tested meets the judgment condition when the first judgment sub-condition, the second judgment sub-condition and the third judgment sub-condition are simultaneously satisfied.

[0075] In the first embodiment, in order to identify whether the battery cell to be tested has a copper deposition problem, changes in key parameters of the battery cell during the charging process may be monitored.

[0076] First, dynamically analyze the growth rate of the current of the tested battery cell over time during the charging process. If the current growth rate at any monitoring point (i.e., the current growth rate at each moment during the above constant voltage charging process) exceeds a preset first preset value (for example, it can be set to 0), this indicates that the electrochemical reaction rate inside the battery cell is abnormally accelerated, which may point to copper precipitation. At this time, it is determined that the above first judgment sub-condition is met.

[0077] It should be noted that when copper deposition occurs in a battery cell, the deposition of copper hinders the normal transmission of lithium ions, causing the battery cell to be unable to reduce the current to the preset low current cutoff value even during the constant voltage charging stage. Instead, it continues to charge and discharge at a higher current level, which usually causes the battery cell temperature to rise abnormally, thus exposing the copper deposition problem inside the battery cell. Therefore, monitoring the change of charging current, especially observing whether the charging current can decay to the low current cutoff as expected, is one of the important methods to determine whether copper deposition occurs in a battery cell.

[0078] Then, the charging time is introduced as an important indicator. The preset charging time is defined based on the charging time of a normal battery cell (for example, 5 hours, which is not specifically limited in the first embodiment) multiplied by a multiple (i.e., the second preset value mentioned above, which can be set to 1.5, which is not specifically limited in the first embodiment). If the charging time of the battery cell to be tested exceeds the preset charging time, it means that the charging efficiency of the battery cell is seriously reduced, indicating that the internal structure or chemical state of the battery cell is abnormal, and it is determined that the second judgment sub-condition mentioned above is met.

[0079] Secondly, the abnormal increase of charging temperature is also one of the characteristics of copper-deposited cells. If at some point in the charging process (or electrical performance test process) the temperature of the cell exceeds a preset high temperature threshold (for example, 40 degrees, 60 degrees, 80 degrees, etc.), it also indicates that there is an overheating risk inside the cell, and it is determined that the third judgment sub-condition mentioned above is met.

[0080] Based on the above three conditions, the battery cell must simultaneously meet the three judgment sub-conditions of abnormal current growth rate, excessively extended charging time, and abnormally increased charging temperature during the charging process, in order to be considered that the battery cell to be tested meets the overall judgment conditions and is confirmed as a copper deposition battery cell. On the contrary, if the battery cell fails to meet these three conditions at the same time, it can be judged as a normal battery cell and does not meet the identification standard of a copper deposition battery cell, that is, when the battery cell to be tested does not meet the first judgment sub-condition, the second judgment sub-condition, and the third judgment sub-condition at the same time, it is determined that the battery cell to be tested does not meet the judgment conditions.

[0081] Through this series of meticulous monitoring and judgment processes, accurate identification of copper-deposited battery cells is achieved, providing an efficient and non-destructive detection method for battery cell failure analysis and safety assessment.

[0082] Optionally, in the method for identifying copper-deposited battery cells provided in Example 1 of the present application, before charging the battery cell to be tested based on the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, the method further includes: deploying a target device at a preset spatial position, wherein a target space exists inside the target device, and the target device is used to prevent objects in the target space from causing a security threat to the external spatial area of ​​the target device; and when the battery cell to be tested is placed in the target space, performing the step of charging the battery cell to be tested.

[0083] In the first embodiment, in order to ensure the safety during the charging test, the target device, for example, an explosion-proof cabinet, can be deployed in a preset test site (such as a factory, etc.). A closed target space is provided inside the target device to isolate and accommodate the battery cells to be tested, effectively preventing the battery cells from posing a safety threat to the external environment of the target device in an abnormal state (such as heating and leakage caused by copper precipitation, etc.).

[0084] When the battery cell to be tested is placed in the target space, the device immediately starts the charging program and performs the charging steps for the battery cell through the charging cabinet.

[0085] By charging the battery cells in a safe and controllable test environment, not only can the charging data of the battery cells be accurately collected, but potential battery cell failures can also be avoided from causing harm to testers or equipment, ensuring the safety and efficiency of the entire testing process, thereby achieving the effect of improving the safety of the battery identification process.

[0086] Optionally, in the first embodiment, the schematic flow chart of the present solution for identifying whether a copper deposition phenomenon exists in a battery cell can be as follows: Figure 2 As shown. Start the identification process and perform OCV / ACR test on the cell to be tested. Determine whether the ACR of the cell to be tested shows high internal resistance, and compare the K value standard with the voltage change of the cell to be tested. The voltage of the cell to be tested meets the voltage drop of 1mv within 1min. If the cell to be tested does not show high internal resistance, or does not meet the voltage drop of 1mv within 1min, the cell to be tested is determined to be a normal cell; if the cell to be tested shows high internal resistance and meets the voltage drop of 1mv within 1min, the cell to be tested is determined to be an abnormal cell, that is, a cell with the risk of copper deposition, and the electrical performance test of the cell to be tested is required. According to the test results, it is analyzed whether there is a voltage at any moment corresponding to the battery cell voltage that is greater than the second preset voltage. If not, it is confirmed that the battery cell to be tested is a copper-deposited battery cell; if so, it is determined whether the above-mentioned judgment criteria are met at the same time, that is, the battery cell to be tested must simultaneously meet the three judgment sub-conditions of abnormal current growth rate during constant voltage charging, excessively extended charging time, and abnormally increased charging temperature during the charging process, in order to consider that the battery cell to be tested meets the overall judgment conditions and confirms that the battery cell to be tested is a copper-deposited battery cell; conversely, if the battery cell to be tested fails to meet the above-mentioned three judgment sub-conditions at the same time, it can be determined that the battery cell to be tested is a normal battery cell.

[0087] Optionally, in the first embodiment, the line graph of the current change of the multiple cells to be tested during the constant voltage charging process in this solution can be as follows: Figure 3 As shown, the changes in current and time of different battery cells during constant voltage charging are shown, and the slope of the broken line represents the rate of current increase. The horizontal axis of the chart represents the time value range, from 0 to 7000, and the vertical axis represents the battery cell C rate value, from 0 to 1. The chart contains broken lines corresponding to 10 battery cells, from 1 to 10. Specifically, Discount 1 represents battery cell 1, the C rate decreases from 1 to 0.2, the discount decreases rapidly, and then tends to be stable; Discount 2 represents battery cell 2, the C rate decreases from 1 to 0.1, the discount decreases rapidly, and then tends to be stable; Discount 3 represents battery cell 3, the C rate decreases from 1 to 0.3, and then increases to 1.0, the discount decreases rapidly, and then gradually increases; Discount 4 represents battery cell 4, the C rate decreases from 1 to 0.2, the discount decreases rapidly, and then tends to be stable; Broken line 5 represents battery cell 5, the C rate decreases from 1 to 0.2, and then increases to 0.7, the broken line decreases rapidly, and then The fold line 6 represents the battery cell 6, the C rate decreases from 1 to 0.1, the fold line decreases rapidly, and then tends to be stable; the fold line 7 represents the battery cell 7, the C rate decreases from 1 to 0.2, the fold line decreases rapidly, and then tends to be stable; the fold line 8 represents the battery cell 8, the C rate decreases from 1 to 0.2, the fold line decreases rapidly, and then tends to be stable; the fold line 9 represents the battery cell 9, the C rate decreases from 1 to 0.3, increases to 0.8, the fold line decreases rapidly, and then gradually increases; the fold line 10 represents the battery cell 10, the C rate decreases from 1 to 0.2, the fold line decreases rapidly, and then tends to be stable. Figure 3 It can be seen that the current growth rate of battery cells 3, 5 and 9 is greater than 0. Therefore, it is determined that there is a risk of copper deposition in battery cells 3, 5 and 9, and further judgment can be made based on the charging time and battery cell temperature.

[0088] Optionally, in the first embodiment, a line graph of the voltage change of a copper-deposited battery cell during charging in the present solution can be as follows: Figure 4 As shown in the figure, it shows the change of voltage and time of a copper-deposited battery cell during the charging process. The horizontal axis of the chart represents the time value range, from 0 to 300, and the vertical axis represents the specific value of the battery cell voltage, from 0 to 1.6V. The chart contains a broken line of voltage change corresponding to a copper-deposited battery cell, which starts from 1.2V and rises slightly to about 1.5V, then drops sharply to 0.2V, and the battery cell voltage tends to be stable afterwards.

[0089] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0090] Embodiment 2

[0091] The second embodiment of the present application also provides a device for identifying a copper-deposited battery cell. It should be noted that the device for identifying a copper-deposited battery cell in the second embodiment of the present application can be used to execute the method for identifying a copper-deposited battery cell provided in the first embodiment of the present application. The device for identifying a copper-deposited battery cell provided in the second embodiment of the present application is introduced below.

[0092] Figure 5 Schematic diagram of a device for identifying copper-deposited cells according to the second embodiment of the present application. Figure 5 As shown, the device includes: a testing unit 501 , a charging unit 502 , a calculating unit 503 and an identifying unit 504 .

[0093] Specifically, the testing unit 501 is used to obtain the battery cell to be tested, and use a preset target device to test the battery cell to be tested to obtain the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested.

[0094] The charging unit 502 is used to charge the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested.

[0095] The calculation unit 503 is used to collect the cell information of the cell to be tested during the charging process, and calculate the current growth rate information of the cell to be tested during the charging process based on the cell information.

[0096] The identification unit 504 is used to identify whether the battery cell to be tested is a copper-deposited battery cell according to the current growth rate information and the battery cell information, and obtain an identification result.

[0097] The device for identifying copper-deposited battery cells provided in the second embodiment of the present application obtains the battery cell to be tested through the testing unit 501, and tests the battery cell to be tested using a preset target device to obtain the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; the charging unit 502 charges the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; the calculation unit 503 collects the battery cell information of the battery cell to be tested during the charging process, and calculates the current growth rate information of the battery cell to be tested during the charging process based on the battery cell information; the identification unit 504 identifies whether the battery cell to be tested is a copper-deposited battery cell according to the current growth rate information and the battery cell information, and obtains an identification result, which solves the problem in the related art that in the process of identifying that the battery cell is a copper-deposited battery cell, the battery cell needs to be disassembled, resulting in damage to the battery cell.

[0098] By obtaining the resistance information and voltage information of the battery cell to be tested, the risk of copper deposition can be predicted, thereby avoiding unnecessary detailed testing of the battery cell where copper deposition does not occur, thereby improving the identification efficiency. At the same time, by monitoring the charging process and calculating the current growth rate, it is possible to accurately determine whether the battery cell is in a copper deposition state in combination with the detailed battery cell information, thereby achieving the effect of improving the identification accuracy. This not only avoids the safety hazards of the traditional method of requiring the battery cell to be disassembled and tested, but also greatly shortens the identification time. It is suitable for the rapid screening of large quantities of battery cells, thereby achieving the effect of improving the safety, accuracy and efficiency of identifying battery cells, and further achieving the effect of ensuring the quality of the battery cell and reducing production costs.

[0099] Optionally, in the copper-deposited battery cell identification device provided in Example 2 of the present application, the above-mentioned resistance information includes the resistance value of the battery cell to be tested for the AC signal, and the voltage information includes the voltage information of the battery cell to be tested in a discharged state. The charging unit 502 includes: a first determination subunit, used to determine the discharge rate of the battery cell to be tested based on the voltage information of the battery cell to be tested in the discharged state; a second determination subunit, used to determine that the battery cell to be tested has an abnormality when the resistance value is greater than or equal to a preset resistance value and the discharge rate is greater than or equal to a preset discharge rate, and execute the step of charging the battery cell to be tested; a third determination subunit, used to determine that the battery cell to be tested has no abnormality when the resistance value is less than the preset resistance value, or the discharge rate is less than the preset discharge rate, and end the identification of the battery cell to be tested.

[0100] Optionally, in the copper-deposited battery cell identification device provided in Example 2 of the present application, the above-mentioned charging unit 502 includes: a first charging sub-unit, used to determine a first current value according to a preset ratio of the battery cell to be tested, and charge the battery cell to be tested according to the first current value until the voltage of the battery cell to be tested reaches a first preset voltage, thereby obtaining the battery cell to be tested after the first charging; a second charging sub-unit, used to charge the battery cell to be tested after the first charging according to the first preset voltage, until the current value of the battery cell to be tested reaches a preset current value, thereby obtaining the battery cell to be tested after the second charging; and a standing sub-unit, used to stand the battery cell to be tested after the second charging for a first preset time period.

[0101] Optionally, in the copper-deposited battery cell identification device provided in Example 2 of the present application, the above-mentioned calculation unit 503 includes: a collection subunit, which is used to collect time information and the current value of the battery cell to be tested every second preset time period during the charging process of the battery cell to be tested after the first charging according to the first preset voltage, so as to obtain the current value corresponding to each moment; and a calculation subunit, which is used to calculate the current growth rate of the battery cell to be tested at each moment based on the time information, the second preset time period and the current value corresponding to each moment, so as to obtain the current growth rate information of the battery cell to be tested during the charging process.

[0102] Optionally, in the copper-deposited battery cell identification device provided in Example 2 of the present application, the above-mentioned battery cell information includes charging time and charging temperature information, and the identification unit 504 includes: a judgment subunit, used to judge whether the battery cell to be tested meets preset judgment conditions based on the current growth rate information, charging time and charging temperature information; a fourth determination subunit, used to determine that the battery cell to be tested is a copper-deposited battery cell when the battery cell to be tested meets the preset judgment conditions, and obtain an identification result; a fifth determination subunit, used to determine that the battery cell to be tested is not a copper-deposited battery when the battery cell to be tested does not meet the judgment conditions, and obtain an identification result.

[0103] Optionally, in the device for identifying copper-deposited battery cells provided in Example 2 of the present application, the above-mentioned battery cell information includes battery cell voltage information, and the identification unit 504 includes: a sixth determination subunit, used to determine the battery cell voltage of the battery cell to be tested at each moment in the charging process based on the battery cell voltage information; a seventh determination subunit, used to determine that the battery cell to be tested is a copper-deposited battery cell when there is no battery cell voltage greater than a second preset voltage among the battery cell voltages at each moment, and obtain an identification result, wherein the numerical value corresponding to the second preset voltage is smaller than the numerical value corresponding to the first preset voltage.

[0104] Optionally, in the copper-deposited battery cell identification device provided in Example 2 of the present application, the above-mentioned judgment subunit includes: a first determination module, used to determine the current growth rate of the battery cell to be tested at each moment based on the current growth rate information, and determine that the battery cell to be tested satisfies the first judgment sub-condition when there is a current growth rate at any moment in the current growth rate at each moment that is greater than a first preset value; a second determination module, used to determine that the battery cell to be tested satisfies the second judgment sub-condition when the charging time is greater than a preset charging time, wherein the preset charging time represents the result of multiplying the second preset value by the charging time of a normal battery cell; a third determination module, used to determine the charging temperature of the battery cell to be tested at each moment based on the charging temperature information, and determine that the battery cell to be tested satisfies the third judgment sub-condition when there is a charging temperature at any moment in the charging temperature at each moment that is greater than the preset temperature; a fourth determination module, used to determine that the battery cell to be tested satisfies the judgment condition when the battery cell to be tested satisfies the first judgment sub-condition, the second judgment sub-condition and the third judgment sub-condition at the same time.

[0105] Optionally, in the copper-deposited battery cell identification device provided in Example 2 of the present application, the above-mentioned device also includes: a deployment unit, used to deploy a target device at a preset spatial position before charging the battery cell to be tested based on the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, wherein there is a target space inside the target device, and the target device is used to prevent objects in the target space from causing a security threat to the external space area of ​​the target device; an execution unit, used to execute the step of charging the battery cell to be tested when the battery cell to be tested is placed in the target space.

[0106] The copper deposition cell identification device includes a processor and a memory. The above-mentioned test unit 501, charging unit 502, calculation unit 503 and identification unit 504 are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0107] The processor includes a kernel, which calls the corresponding program unit from the memory. One or more kernels can be set, and the copper-deposited cells can be identified without destroying the cells by adjusting the kernel parameters.

[0108] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0109] A third embodiment of the present invention provides a computer-readable storage medium having a program stored thereon, and the program, when executed by a processor, implements a method for identifying a copper-deposited battery cell.

[0110] A fourth embodiment of the present invention provides a processor, which is used to run a program, wherein a method for identifying copper-deposited cells is executed when the program is running.

[0111] like Figure 6 As shown, embodiment 5 of the present invention provides an electronic device, the device includes a processor, a memory, and a program stored in the memory and executable on the processor, and the processor implements the following steps when executing the program: obtaining a battery cell to be tested, using a preset target device to test the battery cell to be tested, and obtaining resistance information of the battery cell to be tested and voltage information of the battery cell to be tested; charging the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; collecting battery cell information of the battery cell to be tested during the charging process, and calculating the current growth rate information of the battery cell to be tested during the charging process based on the battery cell information; identifying whether the battery cell to be tested is a copper deposition battery cell according to the current growth rate information and the battery cell information, and obtaining an identification result.

[0112] When the processor executes the program, the following steps are also implemented: the resistance information includes the resistance value of the battery cell to be tested for the AC signal, the voltage information includes the voltage information of the battery cell to be tested in the discharge state, and the battery cell to be tested is charged according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, including: determining the discharge rate of the battery cell to be tested according to the voltage information of the battery cell to be tested in the discharge state; when the resistance value is greater than or equal to the preset resistance value, and the discharge rate is greater than or equal to the preset discharge rate, determining that the battery cell to be tested has an abnormality, and executing the step of charging the battery cell to be tested; when the resistance value is less than the preset resistance value, or the discharge rate is less than the preset discharge rate, determining that the battery cell to be tested has no abnormality, and ending the identification of the battery cell to be tested.

[0113] When the processor executes the program, the following steps are also implemented: charging the battery cell to be tested, including: determining a first current value according to a preset ratio of the battery cell to be tested, and charging the battery cell to be tested according to the first current value until the voltage of the battery cell to be tested reaches a first preset voltage, thereby obtaining the battery cell to be tested after the first charge; charging the battery cell to be tested after the first charge according to the first preset voltage until the current value of the battery cell to be tested reaches a preset current value, thereby obtaining the battery cell to be tested after the second charge; and leaving the battery cell to be tested to rest after the second charge for a first preset time period.

[0114] When the processor executes the program, the following steps are also implemented: collecting cell information of the cell to be tested during the charging process, and calculating the current growth rate information of the cell to be tested during the charging process based on the cell information, including: in the charging process of charging the cell to be tested after the first charging according to the first preset voltage, collecting the time information and the current value of the cell to be tested every second preset time period to obtain the current value corresponding to each time; calculating the current growth rate of the cell to be tested at each time according to the time information, the second preset time period and the current value corresponding to each time to obtain the current growth rate information of the cell to be tested during the charging process.

[0115] When the processor executes the program, the following steps are also implemented: the battery cell information includes the charging time and the charging temperature information, and whether the battery cell to be tested is a copper-deposited battery cell is identified based on the current growth rate information and the battery cell information to obtain an identification result, including: judging whether the battery cell to be tested meets the preset judgment conditions based on the current growth rate information, the charging time and the charging temperature information; when the battery cell to be tested meets the preset judgment conditions, determining that the battery cell to be tested is a copper-deposited battery cell, and obtaining an identification result; when the battery cell to be tested does not meet the judgment conditions, determining that the battery cell to be tested is not a copper-deposited battery cell, and obtaining an identification result.

[0116] When the processor executes the program, the following steps are also implemented: the battery cell information includes the battery cell voltage information, and whether the battery cell to be tested is a copper-deposited battery cell is identified based on the current growth rate information and the battery cell information to obtain an identification result, including: determining the battery cell voltage of the battery cell to be tested at each moment in the charging process based on the battery cell voltage information; when there is no battery cell voltage greater than a second preset voltage in the battery cell voltage at each moment, determining that the battery cell to be tested is a copper-deposited battery cell, and obtaining an identification result, wherein the numerical value corresponding to the second preset voltage is less than the numerical value corresponding to the first preset voltage.

[0117] When the processor executes the program, the following steps are also implemented: judging whether the battery cell to be tested meets the preset judgment condition based on the current growth rate information, the charging time and the charging temperature information, including: determining the current growth rate of the battery cell to be tested at each moment based on the current growth rate information, and determining that the battery cell to be tested meets the first judgment sub-condition when there is a current growth rate at any moment in the current growth rate at each moment that is greater than the first preset value; determining that the battery cell to be tested meets the second judgment sub-condition when the charging time is greater than the preset charging time, wherein the preset charging time represents the result of multiplying the second preset value by the charging time of the normal battery cell; determining the charging temperature of the battery cell to be tested at each moment based on the charging temperature information, and determining that the battery cell to be tested meets the third judgment sub-condition when there is a charging temperature at any moment in the charging temperature at each moment that is greater than the preset temperature; determining that the battery cell to be tested meets the judgment condition when the battery cell to be tested satisfies the first judgment sub-condition, the second judgment sub-condition and the third judgment sub-condition at the same time.

[0118] When the processor executes the program, the following steps are also implemented: before charging the battery cell to be tested based on the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, the above method also includes: deploying a target device at a preset spatial position, wherein there is a target space inside the target device, and the target device is used to prevent objects in the target space from causing a security threat to the external spatial area of ​​the target device; when the battery cell to be tested is placed in the target space, the step of charging the battery cell to be tested is executed.

[0119] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0120] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having the following method steps: obtaining a battery cell to be tested, using a preset target device to test the battery cell to be tested, and obtaining resistance information of the battery cell to be tested and voltage information of the battery cell to be tested; charging the battery cell to be tested based on the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; collecting battery cell information of the battery cell to be tested during the charging process, and calculating current growth rate information of the battery cell to be tested during the charging process based on the battery cell information; identifying whether the battery cell to be tested is a copper deposition battery cell based on the current growth rate information and the battery cell information, and obtaining an identification result.

[0121] When executed on a data processing device, it is also suitable for executing a program initialized with the following method steps: resistance information includes the resistance value of the battery cell to be tested for an AC signal, voltage information includes voltage information of the battery cell to be tested in a discharged state, and the battery cell to be tested is charged according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, including: determining the discharge rate of the battery cell to be tested according to the voltage information of the battery cell to be tested in a discharged state; when the resistance value is greater than or equal to a preset resistance value, and the discharge rate is greater than or equal to a preset discharge rate, determining that the battery cell to be tested has an abnormality, and executing the step of charging the battery cell to be tested; when the resistance value is less than the preset resistance value, or the discharge rate is less than the preset discharge rate, determining that the battery cell to be tested has no abnormality, and ending the identification of the battery cell to be tested.

[0122] When executed on a data processing device, it is also suitable for executing a program that is initialized with the following method steps: charging the battery cell to be tested, including: determining a first current value according to a preset ratio of the battery cell to be tested, and charging the battery cell to be tested according to the first current value until the voltage of the battery cell to be tested reaches a first preset voltage, thereby obtaining the battery cell to be tested after the first charging; charging the battery cell to be tested after the first charging according to the first preset voltage until the current value of the battery cell to be tested reaches a preset current value, thereby obtaining the battery cell to be tested after the second charging; and leaving the battery cell to be tested to rest after the second charging for a first preset time period.

[0123] When executed on a data processing device, it is also suitable for executing a program that is initialized with the following method steps: collecting cell information of a cell to be tested during a charging process, and calculating current growth rate information of the cell to be tested during a charging process based on the cell information, including: in a charging process in which the cell to be tested is charged for the first time according to a first preset voltage, collecting time information and a current value of the cell to be tested every second preset time period to obtain a current value corresponding to each time; calculating a current growth rate of the cell to be tested at each time according to the time information, the second preset time period and the current value corresponding to each time to obtain the current growth rate information of the cell to be tested during the charging process.

[0124] When executed on a data processing device, it is also suitable for executing a program that is initialized with the following method steps: the battery cell information includes charging time and charging temperature information, and whether the battery cell to be tested is a copper-deposited battery cell is identified based on the current growth rate information and the battery cell information to obtain an identification result, including: judging whether the battery cell to be tested meets a preset judgment condition based on the current growth rate information, the charging time and the charging temperature information; when the battery cell to be tested meets the preset judgment condition, determining that the battery cell to be tested is a copper-deposited battery cell, and obtaining an identification result; when the battery cell to be tested does not meet the judgment condition, determining that the battery cell to be tested is not a copper-deposited battery cell, and obtaining an identification result.

[0125] When executed on a data processing device, it is also suitable for executing an initialized program having the following method steps: the battery cell information includes the battery cell voltage information, and whether the battery cell to be tested is a copper-deposited battery cell is identified according to the current growth rate information and the battery cell information to obtain an identification result, including: determining the battery cell voltage of the battery cell to be tested at each moment in the charging process according to the battery cell voltage information; when there is no battery cell voltage greater than a second preset voltage in the battery cell voltage at each moment, determining that the battery cell to be tested is a copper-deposited battery cell, and obtaining an identification result, wherein the value corresponding to the second preset voltage is less than the value corresponding to the first preset voltage.

[0126] When executed on a data processing device, it is also suitable for executing a program initialized with the following method steps: judging whether the battery cell to be tested meets the preset judgment condition based on the current growth rate information, the charging time and the charging temperature information, including: determining the current growth rate of the battery cell to be tested at each moment based on the current growth rate information, and determining that the battery cell to be tested meets the first judgment sub-condition when there is a current growth rate at any moment in the current growth rate at each moment that is greater than a first preset value; determining that the battery cell to be tested meets the second judgment sub-condition when the charging time is greater than the preset charging time, wherein the preset charging time represents the result of multiplying the second preset value by the charging time of a normal battery cell; determining the charging temperature of the battery cell to be tested at each moment based on the charging temperature information, and determining that the battery cell to be tested meets the third judgment sub-condition when there is a charging temperature at any moment in the charging temperature at each moment that is greater than the preset temperature; determining that the battery cell to be tested meets the judgment condition when the battery cell to be tested satisfies the first judgment sub-condition, the second judgment sub-condition and the third judgment sub-condition at the same time.

[0127] When executed on a data processing device, it is also suitable for executing a program that is initialized with the following method steps: before charging the battery cell to be tested based on the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, the above method also includes: deploying a target device at a preset spatial position, wherein a target space exists inside the target device, and the target device is used to prevent objects in the target space from causing a security threat to the external spatial area of ​​the target device; when the battery cell to be tested is placed in the target space, executing the step of charging the battery cell to be tested.

[0128] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0129] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0130] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0132] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0133] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0134] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0135] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0136] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0137] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for identifying a copper-deposited battery cell, characterized in that: include: Acquire a battery cell to be tested, and use a preset target device to test the battery cell to be tested to obtain resistance information of the battery cell to be tested and voltage information of the battery cell to be tested; Charging the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; Collecting cell information of the cell to be tested during the charging process, and calculating current growth rate information of the cell to be tested during the charging process based on the cell information; According to the current growth rate information and the cell information, it is identified whether the cell to be tested is a copper-deposited cell, and an identification result is obtained.

2. The method according to claim 1, characterized in that The resistance information includes the resistance value of the tested cell for the AC signal, the voltage information includes the voltage information of the tested cell in a discharged state, and charging the tested cell according to the resistance information of the tested cell and the voltage information of the tested cell includes: Determining the discharge rate of the battery cell to be tested according to the voltage information of the battery cell to be tested in the discharge state; When the resistance value is greater than or equal to the preset resistance value and the discharge rate is greater than or equal to the preset discharge rate, it is determined that the battery cell to be tested has an abnormality, and a step of charging the battery cell to be tested is performed; When the resistance value is less than the preset resistance value, or the discharge rate is less than the preset discharge rate, it is determined that there is no abnormality in the battery cell to be tested, and the identification of the battery cell to be tested is ended.

3. The method according to claim 1, characterized in that: Charging the battery cell to be tested, comprising: Determine a first current value according to a preset ratio of the battery cell to be tested, and charge the battery cell to be tested according to the first current value until the voltage of the battery cell to be tested reaches a first preset voltage, thereby obtaining the battery cell to be tested after the first charging; Charging the battery cell to be tested after the first charge according to the first preset voltage until the current value of the battery cell to be tested reaches a preset current value, thereby obtaining the battery cell to be tested after the second charge; The battery cell to be tested after the second charging is left to stand for a first preset time period.

4. The method according to any one of claim 3, characterized in that Collecting cell information of the cell to be tested during the charging process, and calculating current growth rate information of the cell to be tested during the charging process based on the cell information, including: During the charging process of charging the battery cell to be tested after the first charging according to the first preset voltage, collecting the time information and the current value of the battery cell to be tested every second preset time to obtain the current value corresponding to each time; The current growth rate of the battery cell to be tested at each moment is calculated according to the moment information, the second preset time length and the current value corresponding to each moment, so as to obtain the current growth rate information of the battery cell to be tested during the charging process.

5. The method according to any one of claim 4, characterized in that The cell information includes charging time and charging temperature information. According to the current growth rate information and the cell information, it is identified whether the cell to be tested is a copper deposition cell, and an identification result is obtained, including: Determining whether the battery cell to be tested meets a preset judgment condition according to the current growth rate information, the charging time and the charging temperature information; In the case where the battery cell to be tested meets a preset judgment condition, determining that the battery cell to be tested is a copper deposition battery cell, and obtaining the identification result; When the battery cell to be tested does not meet the judgment condition, it is determined that the battery cell to be tested does not belong to a copper-deposited battery cell, and the identification result is obtained.

6. The method according to claim 3, characterized in that The cell information includes cell voltage information. According to the current growth rate information and the cell information, identifying whether the cell to be tested is a copper deposition cell is obtained, and obtaining an identification result, including: Determining the cell voltage of the cell to be tested at each moment during the charging process according to the cell voltage information; When there is no cell voltage greater than the second preset voltage among the cell voltages at each moment, it is determined that the cell to be tested is a copper-deposited cell, and the identification result is obtained, wherein the value corresponding to the second preset voltage is smaller than the value corresponding to the first preset voltage.

7. The method according to claim 5, characterized in that Judging whether the battery cell to be tested meets a preset judgment condition according to the current growth rate information, the charging time and the charging temperature information includes: Determine the current growth rate of the battery cell to be tested at each moment according to the current growth rate information, and determine that the battery cell to be tested meets the first judgment sub-condition when the current growth rate at any moment in the current growth rate at each moment is greater than a first preset value; In the case where the charging time is greater than a preset charging time, determining that the battery cell to be tested meets a second judgment sub-condition, wherein the preset charging time represents a result of multiplying a second preset value by a charging time of a normal battery cell; Determine the charging temperature of the battery cell to be tested at each moment according to the charging temperature information, and determine that the battery cell to be tested meets the third judgment sub-condition when the charging temperature at any moment among the charging temperatures at each moment is greater than a preset temperature; When the battery cell to be tested satisfies the first judgment sub-condition, the second judgment sub-condition and the third judgment sub-condition at the same time, it is determined that the battery cell to be tested satisfies the judgment condition.

8. The method according to any one of claims 1 to 3, characterized in that Before charging the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested, the method further includes: Deploy a target device at a preset spatial position, wherein a target space exists inside the target device, and the target device is used to prevent objects in the target space from causing security threats to an external spatial area of ​​the target device; When the battery cell to be tested is placed in the target space, a step of charging the battery cell to be tested is performed.

9. A device for identifying copper-deposited cells, characterized in that: include: A testing unit, used to obtain a battery cell to be tested, and use a preset target device to test the battery cell to be tested, so as to obtain resistance information of the battery cell to be tested and voltage information of the battery cell to be tested; A charging unit, used for charging the battery cell to be tested according to the resistance information of the battery cell to be tested and the voltage information of the battery cell to be tested; A calculation unit, used to collect cell information of the cell to be tested during the charging process, and calculate the current growth rate information of the cell to be tested during the charging process based on the cell information; The identification unit is used to identify whether the battery cell to be tested is a copper-deposited battery cell according to the current growth rate information and the battery cell information, and obtain an identification result.

10. An electronic device, characterized in that: It comprises one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method for identifying copper-deposited battery cells as described in any one of claims 1 to 8.

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