Battery screening method, device and system

Abstract

The invention relates to a battery screening method, device and system, and the method comprises the steps: carrying out the tracing nuclide marking of a chemical substance of a to-be-detected battery, and obtaining a marked chemical substance; charging the to-be-detected battery based on a preset current, so that the marked chemical substance of the to-be-detected battery generates a reaction gas; reaction gases of the to-be-detected battery in different charging voltage ranges are obtained, isotope detection is carried out on the reaction gases in the charging voltage ranges, and the content of the gases with the same isotope in the charging voltage ranges is obtained; according to the content of the gas with the same isotope in each charging voltage range, the to-be-detected battery is screened to determine the consistency of the to-be-detected battery, accurate screening of the consistency of the chemical components in the battery is realized, it is ensured that the later performance level of the battery is consistent, the battery does not need to be damaged, and the detection efficiency is improved. And the accuracy of battery consistency screening is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery screening method, device and system. Background Art

[0002] The consistency of batteries directly affects the performance and service life of the battery system. At present, the consistency screening of batteries usually adopts static sorting or dynamic sorting. The static sorting method means that the battery cell parameters are independent of the working state and the classification and screening are carried out according to the fixed battery cell parameters. The dynamic sorting is based on the classification and screening of different battery cell parameters during the working process of battery charging and discharging.

[0003] In the battery consistency screening method of related technology, the battery status after preparation is usually screened, which requires charging, discharging or heating and other treatments, which can easily cause damage to the inside of the battery. The battery consistency is not reflected in the difference in the internal structure of the battery cell. The battery consistency screening has low accuracy and it is difficult to ensure the consistency of the battery's later performance level. Summary of the invention

[0004] Based on this, it is necessary to provide a battery screening method, device and system that can accurately screen the consistency of the chemical composition inside the battery without damaging the battery, in order to address the technical problems existing in the above-mentioned existing battery consistency screening methods, thereby improving the accuracy of battery consistency screening and ensuring consistent battery performance levels in the later stages.

[0005] In a first aspect, the present application provides a battery screening method, comprising the following steps:

[0006] Conducting tracer radionuclide labeling on the chemical substances of the battery to be tested to obtain labeled chemical substances;

[0007] charging the battery to be tested based on a preset current so that the marked chemical substances of the battery to be tested generate reactive gas;

[0008] Obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range;

[0009] The batteries to be tested are screened according to the content of gases with the same isotope in each charging voltage range to determine the consistency of the batteries to be tested.

[0010] In one embodiment, the step of screening the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested includes:

[0011] After the battery preparation is completed, the cell parameters of the battery to be tested are detected to obtain the cell parameter data;

[0012] According to the cell parameter data, the battery to be tested is screened again to update the consistency of the battery to be tested.

[0013] In one embodiment, the step of labeling the chemical substances of the battery to be tested with a tracer nuclide to obtain the labeled chemical substances comprises:

[0014] Before the battery preparation is completed, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain labeled chemical substances.

[0015] In one embodiment, before the battery preparation is completed, the chemical substances of the battery to be tested are labeled with tracer nuclides, and the step of obtaining the labeled chemical substances includes:

[0016] During the battery formation stage, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain labeled chemical substances.

[0017] In one embodiment, the steps of obtaining the reaction gas of the battery to be tested within different charging voltage ranges, performing isotope detection on the reaction gas within each charging voltage range, and obtaining the content of the gas having the same isotope within each charging voltage range include:

[0018] Select several collection locations of the battery to be tested;

[0019] Sequentially obtain the reaction gases within different charging voltage ranges of the battery to be tested at the same collection position, and perform isotope detection on the reaction gases within each charging voltage range at the same collection position to obtain the content of the gas with the same isotope within each charging voltage range at the same collection position;

[0020] The steps of screening the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested include:

[0021] The battery to be tested is screened according to the content of gas with the same isotope within each charging voltage range at the same collection position to determine the consistency of the battery to be tested.

[0022] In one embodiment, the charging voltage range includes a first voltage range, a second voltage range, and a third voltage range; the reaction gas includes a first gas corresponding to the first voltage range, a second gas corresponding to the second voltage range, and a third gas corresponding to the third voltage range;

[0023] The steps of obtaining the reaction gas of the battery to be tested within different charging voltage ranges, performing isotope detection on the reaction gas within each charging voltage range, and obtaining the content of the gas having the same isotope within each charging voltage range include:

[0024] Acquire a first gas within a first voltage range of the battery to be tested, and perform isotope detection on the first gas within the first voltage range to obtain the content of the gas having the same isotope within the first voltage range;

[0025] Acquire a second gas within a second voltage range of the battery to be tested, and perform isotope detection on the second gas within the second voltage range to obtain the content of the gas having the same isotope within the second voltage range;

[0026] A third gas of the battery to be tested within a third voltage range is obtained, and isotope detection is performed on the third gas within the third voltage range to obtain the content of the gas with the same isotope within the third voltage range.

[0027] In one embodiment, the chemical substances of the battery to be tested include electrolyte solvents, additives or lithium salts.

[0028] In one embodiment, the step of obtaining the reaction gas of the battery to be tested in different charging voltage ranges, and performing isotope detection on the reaction gas in each charging voltage range to obtain the content of the gas with the same isotope in each charging voltage range includes:

[0029] The contents of gases with the same isotope within each charging voltage range are analyzed and processed to obtain a consistency screening report for the corresponding battery to be tested.

[0030] In a second aspect, the present application provides a battery screening device, comprising:

[0031] A material labeling unit is used to label the chemical substances of the battery to be tested with tracer nuclides to obtain labeled chemical substances;

[0032] A charging test unit, used for charging the battery to be tested based on a preset current, so that the marked chemical substances of the battery to be tested produce reaction gas;

[0033] The isotope detection unit obtains the reaction gas of the battery to be tested within different charging voltage ranges, and performs isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range;

[0034] The consistency screening unit is used to screen the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested.

[0035] In a third aspect, the present application provides a battery screening system, comprising a memory, a processing device, and a computer program stored in the memory and executable on the processing device, wherein the processing device implements the steps of any one of the above-mentioned battery screening methods when executing the computer program.

[0036] One of the above technical solutions has the following advantages and beneficial effects:

[0037] In the above-mentioned battery screening method, the chemical substances of the battery to be tested are marked with tracer nuclides to obtain the marked chemical substances; the battery to be tested is charged based on a preset current so that the marked chemical substances of the battery to be tested produce reaction gases; the reaction gases of the battery to be tested in different charging voltage ranges are obtained, and the reaction gases in each charging voltage range are isotope detected to obtain the content of gases with the same isotope in each charging voltage range; the battery to be tested is screened according to the content of gases with the same isotope in each charging voltage range to determine the consistency of the battery to be tested, and to achieve accurate screening of the consistency of the chemical composition inside the battery. The present application screens the chemical materials participating in the reaction inside the battery cell, marks the chemical substances of the battery to be tested with tracer nuclides, and can accurately calculate the content of the chemical substances participating in the reaction in the battery through isotope detection, so as to monitor the reaction content of the corresponding chemical substances in the battery to be tested, and realize battery consistency screening by selecting batteries with consistent reaction amounts, thereby ensuring that the performance level of the battery in the later stage is consistent, and there is no need to damage the battery, thereby improving the accuracy of battery consistency screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of an application scenario of the battery screening method in an embodiment of the present application;

[0039] Figure 2 This is a schematic diagram of the first process of the battery screening method in an embodiment of the present application;

[0040] Figure 3 This is a second flow chart of the battery screening method in an embodiment of the present application;

[0041] Figure 4 This is a schematic diagram of the third process of the battery screening method in the embodiment of the present application;

[0042] Figure 5 This is a first flow chart of the gas content detection step in the embodiment of the present application;

[0043] Figure 6 This is a second flow chart of the gas content detection step in the embodiment of the present application;

[0044] Figure 7 Schematic diagram of the structure of the battery screening device in the embodiment of the present application. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] In addition, the term "plurality" shall mean two or more.

[0048] 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.

[0049] The battery screening method provided in this application can be applied to Figure 1 In the application environment shown. Among them, the processing device may include a processor 102 and a memory 104, and the memory 104 may be used to store data such as the content of gases with the same isotope. The processor 102 may be used to perform tracer nuclide labeling on the chemical substances of the battery to be tested to obtain the labeled chemical substances; charge the battery to be tested based on a preset current so that the labeled chemical substances of the battery to be tested produce reaction gases; obtain the reaction gases of the battery to be tested within different charging voltage ranges, and perform isotope detection on the reaction gases within each charging voltage range to obtain the content of gases with the same isotope within each charging voltage range; screen the battery to be tested according to the content of gases with the same isotope within each charging voltage range to determine the consistency of the battery to be tested. The processing device may also include a display 106, which may display data such as the content of gases with the same isotope through a graphical interface.

[0050] In one embodiment, Figure 2 As shown, a battery screening method is provided, which is applied to Figure 1The processor 102 in the embodiment is taken as an example to illustrate, and the following steps are included:

[0051] Step S210 , labeling the chemical substances of the battery to be tested with tracer nuclides to obtain labeled chemical substances.

[0052] The battery to be tested may be a lithium battery, and illustratively, the battery to be tested may include at least one single lithium battery cell. Chemical substances are arranged inside the battery to be tested, and the chemical substances refer to substances that can generate gas through chemical reactions. For example, the chemical substances of the battery to be tested may be electrolytes, etc. In one example, the chemical substances of the battery to be tested include electrolyte solvents, additives, or lithium salts.

[0053] Tracer nuclides are also called isotopes. Tracer nuclides can be used to track the movement and change process of substances. For example, tracer nuclides can be, but are not limited to, 13C, 15N, 2H or 18O. It should be noted that the chemical properties of the compound labeled with the tracer nuclide remain unchanged.

[0054] By labeling the chemical substances of the battery to be tested with tracer nuclides, labeled chemical substances are obtained so that the isotopes can be tracked in subsequent steps.

[0055] Step S220 , charging the battery to be tested based on a preset current, so that the marked chemical substances of the battery to be tested generate reaction gas.

[0056] The magnitude of the preset current can be obtained according to the system preset. For example, charging the battery to be tested based on the preset current can ensure that the positive and negative electrode materials inside the battery to be tested are activated. Exemplarily, charging the battery to be tested based on the preset current can form a SEI film on the negative electrode surface after the positive and negative electrode materials inside the battery to be tested are activated, making the performance of the battery to be tested more stable.

[0057] The battery to be tested is charged based on a preset current, so that the battery to be tested undergoes an electrochemical reaction during the charging process, and then the marked chemical substances of the battery to be tested produce reaction gas. It should be noted that the gas produced by the battery to be tested is different in different charging voltage intervals.

[0058] Step S230, obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range.

[0059] By extracting the gas produced by the chemical reaction of the battery under test in different charging voltage ranges, the reaction gas of the battery under test in different charging voltage ranges is obtained. By performing isotope detection on the reaction gas in each charging voltage range, the content of the chemical substances involved in the reaction is calculated, and the content of the gas with the same isotope in each charging voltage range is obtained.

[0060] Step S240 , screening the batteries to be tested according to the contents of gases with the same isotope within each charging voltage range to determine the consistency of the batteries to be tested.

[0061] By monitoring the content of the gas with the same isotope in the battery to be tested, the battery to be tested is screened for consistency according to the content of the gas with the same isotope in each charging voltage range, thereby determining the consistency of the battery to be tested. Exemplarily, during the battery consistency screening process, the content of the gas with the same isotope in multiple batteries to be tested can be monitored, and then the batteries to be tested with the same content can be screened out according to the gas content, thereby achieving consistency screening of the batteries to be tested and ensuring that the performance level of the battery cells is consistent in the later stage.

[0062] In the above-mentioned embodiments, the chemical substances of the battery to be tested are marked with tracer nuclides to obtain the marked chemical substances; the battery to be tested is charged based on a preset current so that the marked chemical substances of the battery to be tested produce reaction gases; the reaction gases of the battery to be tested in different charging voltage ranges are obtained, and the reaction gases in each charging voltage range are isotope detected to obtain the content of gases with the same isotope in each charging voltage range; the battery to be tested is screened according to the content of gases with the same isotope in each charging voltage range to determine the consistency of the battery to be tested, and to achieve accurate screening of the consistency of the chemical composition inside the battery. The present application screens the chemical materials participating in the reaction inside the battery cell, marks the chemical substances of the battery to be tested with tracer nuclides, and can accurately calculate the content of the chemical substances participating in the reaction in the battery through isotope detection, so as to monitor the reaction content of the corresponding chemical substances in the battery to be tested, and realize battery consistency screening by selecting batteries with consistent reaction amounts, thereby ensuring that the performance level of the battery in the later stage is consistent, and there is no need to damage the battery, thereby improving the accuracy of battery consistency screening.

[0063] In one embodiment, Figure 3 As shown, a battery screening method is provided, which is applied to Figure 1 The processor 102 in the embodiment is taken as an example to illustrate, and the following steps are included:

[0064] Step S310 , labeling the chemical substances of the battery to be tested with tracer nuclides to obtain labeled chemical substances.

[0065] For the specific description of the above step S310, please refer to the description of the above embodiment, which will not be repeated here.

[0066] Step S320 , charging the battery to be tested based on a preset current, so that the marked chemical substances of the battery to be tested generate reaction gas.

[0067] For the specific description of the above step S320, please refer to the description of the above embodiment, which will not be repeated here.

[0068] Step S330, obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range.

[0069] For the specific description of the above step S330, please refer to the description of the above embodiment, which will not be repeated here.

[0070] Step S340 , screening the batteries to be tested according to the contents of gases with the same isotope within each charging voltage range to determine the consistency of the batteries to be tested.

[0071] For the specific description of the above step S340, please refer to the description of the above embodiment, which will not be repeated here.

[0072] Step S350, after the battery preparation is completed, the cell parameters of the battery to be tested are detected to obtain cell parameter data.

[0073] Among them, after the battery preparation is completed, it means after the battery to be tested is manufactured and off the production line. Cell parameters refer to the performance parameters and appearance parameters of the battery to be tested. For example, performance parameters can be but are not limited to parameters such as capacity, internal resistance, self-discharge, voltage or temperature rise. Appearance parameters can be but are not limited to parameters such as thickness.

[0074] For example, after the battery preparation is completed, the performance parameter data can be obtained by performing a charge and discharge test on the battery to be tested and testing the performance parameters of the battery to be tested. In addition, the appearance parameter data of the battery to be tested can be obtained by performing an appearance test on the battery to be tested, and the cell parameter data of the battery to be tested can be obtained based on the performance parameter data and the appearance parameter data.

[0075] Step S360: re-screen the battery to be tested according to the cell parameter data to update the consistency of the battery to be tested.

[0076] According to the cell parameter data, the cells to be tested with consistent cell parameter data are screened as a group to achieve a second screening of the cells to be tested, and the consistency of the cells to be tested is updated, thereby optimizing the consistency of the cells to be tested.

[0077] In the above embodiment, the chemical materials participating in the reaction inside the battery to be tested are first screened, the chemical substances of the battery to be tested are marked by tracer nuclides, and the content of the chemical substances participating in the reaction in the battery can be accurately calculated by isotope detection, so as to monitor the reaction content of the corresponding chemical substances in the battery to be tested, and the first screening of the battery to be tested is achieved by selecting batteries with consistent reaction amounts, and then the battery parameters of the battery to be tested are detected, and the battery to be tested is screened and grouped according to the cell parameter data, thereby achieving a second screening of the battery to be tested, thereby ensuring that the performance level of the battery in the later stage is consistent, and further improving the accuracy of battery consistency screening.

[0078] In one embodiment, Figure 4 As shown, a battery screening method is provided, which is applied to Figure 1 The processor 102 in the embodiment is taken as an example to illustrate, and the following steps are included:

[0079] Step S410, before the battery preparation is completed, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain labeled chemical substances.

[0080] The process before the battery preparation is completed may be any process stage in the preparation process of the battery to be tested.

[0081] Before the battery preparation is completed, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain labeled chemical substances so that the isotopes can be tracked in subsequent steps.

[0082] In one example, step S410 includes:

[0083] During the battery formation stage, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain labeled chemical substances.

[0084] Among them, the battery formation stage refers to the preparation stage of forming the SEI film on the negative electrode surface by charging the battery for the first time after high-temperature aging, activating the battery.

[0085] During the battery formation stage, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain the labeled chemical substances. There is no need to cause any damage to the battery to be tested, and no additional charging, discharging or heating treatment is required. Only the gas generated by the electrochemical reaction in the battery formation stage needs to be detected. This can achieve accurate screening of battery consistency while ensuring the integrity of the battery to be tested.

[0086] Step S420 , charging the battery to be tested based on a preset current, so that the marked chemical substances of the battery to be tested generate reaction gas.

[0087] For the specific description of the above step S420, please refer to the description of the above embodiment, which will not be repeated here.

[0088] Step S430, obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range.

[0089] For the specific description of the above step S430, please refer to the description of the above embodiment, which will not be repeated here.

[0090] Step S440 , screening the batteries to be tested according to the contents of gases with the same isotope within each charging voltage range to determine the consistency of the batteries to be tested.

[0091] For the specific description of the above step S440, please refer to the description of the above embodiment, which will not be repeated here.

[0092] In the above embodiment, by screening the chemical materials participating in the reaction inside the battery to be tested before the battery preparation is completed (such as the battery formation stage), the chemical substances of the battery to be tested are marked by tracer nuclides, and the content of the chemical substances participating in the reaction in the battery can be accurately calculated by isotope detection, so as to monitor the reaction content of the corresponding chemical substances in the battery to be tested, and realize battery consistency screening by selecting batteries with consistent reaction amounts, thereby ensuring that the performance level of the battery in the later stage is consistent, without damaging the battery, and without additional charging, discharging or heating and other treatments, the convenience of battery consistency screening is improved, and the accuracy of battery consistency screening is improved.

[0093] In one embodiment, Figure 5 As shown, the steps of obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range include:

[0094] Step S510, selecting a plurality of acquisition positions of the battery to be tested.

[0095] The collection position may be the injection hole of the battery to be tested, or the top, middle or bottom of the battery to be tested. For example, the injection hole and the middle position of the battery to be tested may be selected.

[0096] Step S520, sequentially acquiring the reaction gases within different charging voltage ranges of the battery to be tested at the same collection position, and performing isotope detection on the reaction gases within each charging voltage range at the same collection position to obtain the content of the gas with the same isotope within each charging voltage range at the same collection position.

[0097] For example, by extracting the gas generated by the chemical reaction of the battery under test within different charging voltage ranges at the injection hole of the battery under test, the reaction gas within different charging voltage ranges at the injection hole position of the battery under test is obtained. By extracting the gas generated by the chemical reaction of the battery under test within different charging voltage ranges at the middle position of the battery under test, the reaction gas within different charging voltage ranges at the middle position of the battery under test is obtained. The isotope detection is performed on the reaction gas within each charging voltage range at the injection hole position and the middle position respectively, and the content of the chemical substances involved in the reaction is calculated, and the content of the gas with the same isotope within each charging voltage range at the injection hole position of the battery under test is obtained, and the content of the gas with the same isotope within each charging voltage range at the middle position of the battery under test is obtained. By detecting the gas content at different positions of the battery under test, it is judged whether the chemical substances react evenly after marking.

[0098] In one example, the steps of screening the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested include:

[0099] The battery to be tested is screened according to the content of gas with the same isotope within each charging voltage range at the same collection position to determine the consistency of the battery to be tested.

[0100] For example, by monitoring the content of gas with the same isotope extracted from the battery to be tested at the injection hole position, the battery to be tested is screened for consistency according to the content of gas with the same isotope in each charging voltage range at the injection hole position, thereby determining the consistency of the battery to be tested. For another example, by monitoring the content of gas with the same isotope extracted from the battery to be tested at the middle position, the battery to be tested is screened for consistency according to the content of gas with the same isotope in each charging voltage range at the middle position, thereby determining the consistency of the battery to be tested, and realizing monitoring the reaction content of the corresponding chemical substances of the battery to be tested at different collection positions, and realizing battery consistency screening by selecting batteries with consistent reaction amounts, thereby further improving the accuracy of battery consistency screening.

[0101] In one embodiment, the charging voltage range includes a first voltage range, a second voltage range, and a third voltage range; the reaction gas includes a first gas corresponding to the first voltage range, a second gas corresponding to the second voltage range, and a third gas corresponding to the third voltage range. Figure 6 As shown, the steps of obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range include:

[0102] Step S610, obtaining a first gas within a first voltage range of the battery to be tested, and performing isotope detection on the first gas within the first voltage range to obtain the content of the gas with the same isotope within the first voltage range.

[0103] The first voltage range may be below 2.5 V, the second voltage range may be between 2.5 V and 3 V, and the third voltage range may be between 3 V and 3.5 V. The first gas generated by the battery under test below 2.5 V may be H2, CO2, or HF, etc.; the second gas generated by the battery under test at 2.5 V to 3 V may be C2H4; and the third gas generated by the battery under test at 3 V to 3.5 V may be an alkane gas.

[0104] For example, the gas generated by the chemical reaction of the battery to be tested is extracted within the charging voltage range below 2.5 V, thereby obtaining the first gas of the battery to be tested below 2.5 V. The content of the chemical substances involved in the reaction is calculated by performing isotope detection on the first gas within the charging voltage range below 2.5 V, thereby obtaining the content of the gas with the same isotope within the charging voltage range below 2.5 V.

[0105] Step S620, obtaining a second gas within a second voltage range of the battery to be tested, and performing isotope detection on the second gas within the second voltage range to obtain the content of the gas having the same isotope within the second voltage range.

[0106] For example, the gas generated by the chemical reaction of the battery to be tested is extracted within the charging voltage range of 2.5V to 3V, thereby obtaining the second gas of the battery to be tested between 2.5V and 3V. The content of the chemical substances involved in the reaction is calculated by performing isotope detection on the second gas within the charging voltage range of 2.5V to 3V, thereby obtaining the content of the gas with the same isotope within the charging voltage range of 2.5V to 3V.

[0107] Step S630, obtaining a third gas of the battery to be tested within a third voltage range, and performing isotope detection on the third gas within the third voltage range to obtain the content of the gas with the same isotope within the third voltage range.

[0108] For example, by extracting the gas produced by the chemical reaction of the battery to be tested within the charging voltage range of 3V to 3.5V, a third gas between 3V and 3.5V of the battery to be tested is obtained. By performing isotope detection on the third gas in the charging voltage range of 3V to 3.5V, the content of the chemical substances involved in the reaction is calculated, and the content of the gas with the same isotope in the charging voltage range of 3V to 3.5V is obtained. Furthermore, by monitoring the reaction content of the corresponding chemical substances in the battery to be tested within different charging voltage ranges, battery consistency screening is achieved by selecting batteries with consistent reaction amounts, thereby ensuring that the battery's later performance level is consistent, and there is no need to damage the battery, thereby improving the accuracy of battery consistency screening.

[0109] In one embodiment, the steps of obtaining the reaction gas of the battery to be tested within different charging voltage ranges, performing isotope detection on the reaction gas within each charging voltage range, and obtaining the content of the gas with the same isotope within each charging voltage range include:

[0110] The contents of gases with the same isotope within each charging voltage range are analyzed and processed to obtain a consistency screening report for the corresponding battery to be tested.

[0111] For example, the content of gases with the same isotope within each charging voltage range is qualitatively and quantitatively analyzed to obtain a consistency screening report of the corresponding battery to be tested, so that the user can view the reaction mechanism and reaction amount of the chemical substances of the battery to be tested in the consistency screening report.

[0112] It should be understood that although Figures 2 to 6 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figures 2 to 6 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0113] In one embodiment, Figure 7 As shown, a battery screening device is also provided, comprising:

[0114] The material labeling unit 710 is used to label the chemical substances of the battery to be tested with tracer nuclides to obtain labeled chemical substances.

[0115] The charging test unit 720 is used to charge the battery to be tested based on a preset current so that the marked chemical substances of the battery to be tested generate reaction gas.

[0116] The isotope detection unit 730 obtains the reaction gas of the battery under test in different charging voltage ranges, and performs isotope detection on the reaction gas in each charging voltage range to obtain the content of the gas with the same isotope in each charging voltage range.

[0117] The consistency screening unit 740 is used to screen the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested.

[0118] For the specific definition of the battery screening device, please refer to the definition of the battery screening method above, which will not be repeated here. Each module in the above-mentioned battery screening device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processing device in the battery screening system in the form of hardware, or can be stored in the memory of the battery screening system in the form of software, so that the processing device can call and execute the operations corresponding to the above modules.

[0119] In one embodiment, a battery screening system is also provided, including a memory, a processing device, and a computer program stored in the memory and executable on the processing device, wherein the processing device implements the steps of any one of the above-mentioned battery screening methods when executing the computer program.

[0120] The processing device may perform the following steps of the battery screening method:

[0121] The chemical substances of the battery to be tested are labeled with tracer nuclides to obtain labeled chemical substances; the battery to be tested is charged based on a preset current so that the labeled chemical substances of the battery to be tested produce reaction gases; the reaction gases of the battery to be tested within different charging voltage ranges are obtained, and isotope detection is performed on the reaction gases within each charging voltage range to obtain the content of gases with the same isotope within each charging voltage range; the battery to be tested is screened according to the content of gases with the same isotope within each charging voltage range to determine the consistency of the battery to be tested, thereby achieving accurate screening of the consistency of the chemical composition inside the battery.

[0122] In one embodiment, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the above-mentioned power allocation methods are implemented.

[0123] For example, when the computer program is executed by a processor, the following steps of the battery screening method are implemented:

[0124] The chemical substances of the battery to be tested are labeled with tracer nuclides to obtain labeled chemical substances; the battery to be tested is charged based on a preset current so that the labeled chemical substances of the battery to be tested produce reaction gases; the reaction gases of the battery to be tested within different charging voltage ranges are obtained, and isotope detection is performed on the reaction gases within each charging voltage range to obtain the content of gases with the same isotope within each charging voltage range; the battery to be tested is screened according to the content of gases with the same isotope within each charging voltage range to determine the consistency of the battery to be tested, thereby achieving accurate screening of the consistency of the chemical composition inside the battery.

[0125] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned division operation methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0126] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery screening method, characterized in that: The following steps are involved: Conducting tracer radionuclide labeling on the chemical substances of the battery to be tested to obtain labeled chemical substances; Charging the battery to be tested based on a preset current so that the marked chemical substances of the battery to be tested generate reaction gas; Acquire the reaction gas of the battery to be tested within different charging voltage ranges, and perform isotope detection on the reaction gas within each charging voltage range to obtain the content of gas with the same isotope within each charging voltage range; The battery to be tested is screened according to the content of the gas with the same isotope within each charging voltage range to determine the consistency of the battery to be tested.

2. The battery screening method according to claim 1, characterized in that: The step of screening the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested includes: After the battery preparation is completed, the cell parameters of the battery to be tested are detected to obtain the cell parameter data; The battery to be tested is screened again according to the battery cell parameter data to update the consistency of the battery to be tested.

3. The battery screening method according to claim 1, characterized in that: The step of labeling the chemical substances of the battery to be tested with tracer nuclides to obtain the labeled chemical substances comprises: Before the battery preparation is completed, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain the labeled chemical substances.

4. The battery screening method according to claim 3, characterized in that: Before the battery preparation is completed, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain the labeled chemical substances, which comprises: In the battery formation stage, the chemical substances of the battery to be tested are labeled with tracer nuclides to obtain the labeled chemical substances.

5. The battery screening method according to claim 1, characterized in that: The step of obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range comprises: Selecting several collection positions of the battery to be tested; Sequentially acquiring the reaction gases within different charging voltage ranges of the battery to be tested at the same collection position, and performing isotope detection on the reaction gases within each charging voltage range at the same collection position to obtain the content of the gas with the same isotope within each charging voltage range at the same collection position; The step of screening the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested includes: The battery to be tested is screened according to the content of the gas with the same isotope within each charging voltage range at the same collection position to determine the consistency of the battery to be tested.

6. The battery screening method according to claim 1, characterized in that: The charging voltage range includes a first voltage range, a second voltage range and a third voltage range; the reaction gas includes a first gas corresponding to the first voltage range, a second gas corresponding to the second voltage range and a third gas corresponding to the third voltage range; The step of obtaining the reaction gas of the battery to be tested within different charging voltage ranges, and performing isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range comprises: Acquire a first gas of the battery to be tested within a first voltage range, and perform isotope detection on the first gas within the first voltage range to obtain the content of gas with the same isotope within the first voltage range; Acquire a second gas of the battery to be tested within a second voltage range, and perform isotope detection on the second gas within the second voltage range to obtain the content of gas with the same isotope within the second voltage range; A third gas of the battery to be tested within a third voltage range is obtained, and isotope detection is performed on the third gas within the third voltage range to obtain the content of the gas with the same isotope within the third voltage range.

7. The battery screening method according to any one of claims 1 to 6, characterized in that: The chemical substances of the battery to be tested include electrolyte solvent, additives or lithium salt.

8. The battery screening method according to claim 7, characterized in that: The step of obtaining the reaction gas of the battery to be tested in different charging voltage ranges, and performing isotope detection on the reaction gas in each charging voltage range to obtain the content of the gas with the same isotope in each charging voltage range comprises: The contents of gases with the same isotope within each charging voltage range are analyzed and processed to obtain a consistency screening report corresponding to the battery to be tested.

9. A battery screening device, characterized in that: include: A material labeling unit is used to label the chemical substances of the battery to be tested with tracer nuclides to obtain labeled chemical substances; A charging test unit, used for charging the battery to be tested based on a preset current, so that the marked chemical substances of the battery to be tested generate reaction gas; an isotope detection unit, which obtains the reaction gas of the battery to be tested within different charging voltage ranges, and performs isotope detection on the reaction gas within each charging voltage range to obtain the content of the gas with the same isotope within each charging voltage range; The consistency screening unit is used to screen the battery to be tested according to the content of the gas with the same isotope in each charging voltage range to determine the consistency of the battery to be tested.

10. A battery screening system, characterized in that: The invention comprises a memory, a processing device, and a computer program stored in the memory and executable on the processing device, wherein the processing device implements the steps of the battery screening method according to any one of claims 1 to 8 when executing the computer program.

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