CN116008117A

CN116008117A - Battery infiltration test method, test equipment, device and computer equipment

Info

Publication number: CN116008117A
Application number: CN202310310523.5A
Authority: CN
Inventors: 李茂华; 耿慧慧; 苗星晖; 李伟; 吴凯
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-04-25
Anticipated expiration: 2043-03-28
Also published as: CN116008117B

Abstract

The application relates to a battery infiltration testing method, testing equipment, a device and computer equipment. According to the method, a first corresponding relation between weight data and time data of the battery to be measured immersed in the electrolytic solution is obtained, and an immersing result of the battery to be measured is determined according to the first corresponding relation, wherein the immersing result can represent the immersing rate of the battery to be measured. According to the method, the infiltration rate is quantitatively evaluated according to the corresponding relation between the weight change of the electrolyte solution absorbed by the battery to be measured in the infiltration process and the time, so that the accuracy of the infiltration test of the battery to be measured can be improved to a certain extent.

Description

Battery infiltration test method, test equipment, device and computer equipment

Technical Field

The present disclosure relates to the field of batteries, and in particular, to a method, a device, and a computer device for testing a battery infiltration rate.

Background

In the production and manufacturing process of the battery, the electrolyte is injected and then needs to be kept stand for a period of time to ensure that the pole piece and the diaphragm are fully soaked. The insufficient infiltration can cause problems such as black spot lithium precipitation and the like, thereby causing the performance reduction and the safety risk of the battery; too long a soak time can extend the battery production cycle, resulting in increased battery manufacturing costs. Therefore, how to accurately test the electrolyte infiltration rate of a battery is a technical problem to be solved by the current battery research.

At present, the method for testing the infiltration rate of the battery mainly evaluates the infiltration speed according to the speed of the electrode absorbing electrolyte in the infiltration process, but the method has the problem of inaccurate test.

Disclosure of Invention

In view of the above problems, the application provides a battery infiltration testing method, testing equipment, device and computer equipment, which can solve the problem of inaccurate battery infiltration testing.

In a first aspect, the present application provides a method for testing battery wetting. The method comprises the following steps:

acquiring a first corresponding relation between weight data and time data of a battery to be tested immersed in an electrolytic solution;

determining the infiltration result of the battery to be tested according to the first corresponding relation; and the infiltration result represents the infiltration rate of the battery to be measured.

According to the technical scheme, the first corresponding relation between the weight data and the time data of the battery to be tested immersed in the electrolyte is obtained, and the immersing result of the battery to be tested is determined according to the first corresponding relation, wherein the immersing result can represent the immersing rate of the battery to be tested. According to the method, the infiltration rate is quantitatively evaluated according to the corresponding relation between the weight change of the electrolyte solution absorbed by the battery to be measured in the infiltration process and the time, so that the accuracy of the infiltration test of the battery to be measured can be improved to a certain extent. In addition, the first corresponding relation is obtained by measuring the whole battery to be measured in the electrolytic solution, and the sealing property of the battery to be measured is strong, so that the volatility of the electrolytic solution is weak in the process of measuring the battery to be measured in the electrolytic solution, the actual weight change condition of the battery to be measured can be accurately reflected in the measurement of the weight data, and the accuracy of the battery soaking test can be improved to a certain extent.

In some embodiments, the infiltration result includes at least one of an infiltration duration of the battery to be measured, a duration of a first infiltration stage, an infiltration rate of the first infiltration stage, and a duration of a second infiltration stage; the infiltration rate of the first infiltration stage is greater than the infiltration rate of the second infiltration stage.

In the technical scheme of the embodiment of the application, the infiltration result can comprise a plurality of index amounts, each index amount is associated with each infiltration stage of the battery, the infiltration process of analyzing the battery to be measured from multiple dimensions is realized, namely, the infiltration process of decomposing the battery to be measured is realized, and the infiltration rate of the battery can be further accurately evaluated.

In some embodiments, the impregnating result includes the impregnating duration, and the determining, according to the first correspondence, the impregnating result of the to-be-detected battery includes:

removing data of the weight in a preset weight range from the first corresponding relation to obtain a processed first corresponding relation;

and determining the duration corresponding to the maximum moment in the processed first corresponding relation as the infiltration duration.

In the technical scheme of the embodiment of the application, the first corresponding relation is processed by combining the characteristic that the battery to be detected absorbs the electrolyte solution, namely after the absorption is finished, the weight of the battery to be detected or the weight of the electrolyte solution does not change obviously any more, so that the processed first corresponding relation can react more accurately to the whole infiltration process from the beginning to the end of infiltration, and the accurate infiltration time is further obtained.

In some embodiments, the impregnating result includes a duration of the first impregnating stage, and the determining, according to the first correspondence, the impregnating result of the battery to be tested includes:

converting the time data in the first corresponding relation to obtain a second corresponding relation; the second corresponding relation comprises weight data and time data of a linear relation;

and determining the duration of the first infiltration stage of the battery to be tested according to the second corresponding relation.

According to the technical scheme, the time data in the first corresponding relation is converted to obtain the second corresponding relation, so that the second corresponding relation comprises the data of the linear relation, and the duration of the first infiltration stage of the battery to be tested can be obtained rapidly and accurately based on the data of the linear relation.

In some embodiments, the determining, according to the second correspondence, the duration of the first impregnation stage of the battery to be tested includes:

determining a first straight line according to weight data and time data containing linear relations in the second corresponding relation;

and determining the duration of the first soaking stage of the battery to be tested according to the time data corresponding to the overlapping part of the curve corresponding to the second corresponding relation and the first straight line.

In the technical scheme of the embodiment of the application, the linear relation contained in the second corresponding relation can directly reflect the rapid infiltration process of the battery to be tested, so that the first straight line presenting the linear relation is used for analyzing the second corresponding relation, and the duration of the first infiltration stage of the battery to be tested can be rapidly and accurately obtained.

In some embodiments, the infiltration process parameters further comprise an infiltration rate of the first infiltration stage, the method further comprising:

and determining the infiltration rate of the first infiltration stage of the battery to be measured according to the slope of the first straight line.

In the technical scheme of the embodiment of the application, since the linear relation included in the second corresponding relation can directly reflect the rapid infiltration process of the battery to be measured, the infiltration rate of the first infiltration stage of the battery to be measured can be rapidly and accurately obtained according to the slope of the first straight line showing the linear relation.

In some embodiments, the method further comprises:

and determining the duration of the second infiltration stage according to the infiltration duration and the duration of the first infiltration stage.

According to the technical scheme, the second infiltration stage duration can be obtained through the infiltration duration and the first infiltration stage duration, and the second infiltration stage duration represents the difficult infiltration stage duration, so that quantitative analysis of the difficult infiltration stage in the battery infiltration process is realized, and a certain theoretical basis is provided for optimizing the battery material.

In some embodiments, the determining, according to the first correspondence, the infiltration result of the battery to be measured includes:

acquiring a corresponding infiltration behavior model of the battery to be tested; the infiltration behavior model is used for representing a nonlinear relation between weight data and time data of the battery to be measured infiltrated into the electrolyte;

and determining the duration of a first infiltration stage of the battery to be tested according to the first corresponding relation and the infiltration behavior model.

According to the technical scheme, the infiltration behavior model can represent the infiltration behavior of the electrolytic solution in the porous material, so that the first corresponding relation is analyzed by means of the infiltration behavior model, an analysis method for comparing theoretical data with actual data is realized, and the duration of the first infiltration stage of the battery to be tested can be obtained quickly and accurately to a certain extent.

In some embodiments, the determining, according to the first correspondence, a wetting result of the battery to be tested includes:

and determining the duration of the first soaking stage of the battery to be tested according to the first curve corresponding to the first corresponding relation and the second curve corresponding to the soaking behavior model.

In the technical scheme of the embodiment of the application, the first curve corresponds to the first corresponding relation and the second curve corresponds to the infiltration behavior model, so that the time length of the first infiltration stage can be determined intuitively and rapidly by comparing the difference between the first curve and the second curve.

In some embodiments, the determining, according to the first curve corresponding to the first correspondence and the second curve corresponding to the infiltration behavior model, the duration of the first infiltration stage of the battery to be measured includes:

and determining the duration of the first soaking stage of the battery to be tested according to the time data corresponding to the superposition part of the first curve and the second curve.

In the technical scheme of the embodiment of the application, since the coincidence data of the infiltration behavior model and the first corresponding relation represent that the theoretical data and the actual measurement data are matched, the duration of the first infiltration stage of the battery to be measured can be rapidly and accurately obtained by analyzing the matched theoretical data and the matched actual measurement data.

Performing difference value operation on the weight data corresponding to the first curve and the weight data corresponding to the second curve;

and determining the duration of the first soaking stage of the battery to be tested according to the corresponding relation between the weight data and the time data after the difference value operation.

According to the technical scheme, the matched theoretical data and actual measurement data can be obtained by analyzing the difference data between the first curve of the first corresponding relation and the second curve of the infiltration behavior model, and the duration of the first infiltration stage of the battery to be measured can be obtained rapidly and accurately by analyzing the matched theoretical data and the actual measurement data.

In some embodiments, the method further comprises:

acquiring an initial corresponding relation between the weight of the battery to be tested immersed in the electrolytic solution and time;

determining the volatilization rate of the electrolytic solution according to weight data and time data containing linear relation in the initial corresponding relation;

and processing the initial corresponding relation according to the volatilization rate to obtain the first corresponding relation.

In the technical scheme of the embodiment of the application, the influence of the volatilization characteristic of the electrolyte solution on the measurement accuracy in the process of soaking the battery into the electrolyte solution is considered, when the initial corresponding relation between the weight data containing the volatilization amount of the electrolyte solution and the time data is obtained, the initial corresponding relation is subjected to deduction of the volatilization amount of the electrolyte solution, so that the actual liquid absorption amount and the time relation of the battery to be tested can be truly reflected, and the accuracy of the battery soaking test can be improved to a certain extent.

In a second aspect, the present application provides a battery infiltration testing apparatus. The battery infiltration test apparatus includes: a weighing platform, a container and a bracket;

the container is arranged on the weighing platform and is used for containing electrolytic solution;

the bracket is used for supporting the battery to be tested to be placed in the electrolytic solution in the container;

the weighing platform is used for weighing the container to obtain the corresponding relation between the weight of the battery to be measured immersed in the electrolytic solution and the time; the corresponding relation is used for determining the infiltration result of the battery to be tested.

In the technical scheme of the embodiment of the application, a testing equipment for battery infiltration is provided, the testing equipment can easily obtain weight data and time data of an electrolytic solution in the infiltration process through a weighing platform, and then experimental data reference basis is provided for later-stage determination of the infiltration rate of a battery, so that the accuracy of battery infiltration measurement can be improved to a certain extent.

In some embodiments, the support comprises a support member and a connecting member connected with the support member, the support member is connected with the battery to be tested through the connecting member, the container comprises a top cover and a box body, an opening is formed in the top cover, and the connecting member penetrates through the opening.

In the technical scheme of this application embodiment, through the trompil on the container top cap, can reduce the volume of volatilizing of electrolytic solution and to measuring influence, and then can improve the measurement accuracy to a certain extent.

In a third aspect, the present application provides a battery infiltration testing apparatus. The battery infiltration testing device comprises:

the acquisition module is used for acquiring a first corresponding relation between weight data and time data of the battery to be detected immersed in the electrolytic solution;

the determining module is used for determining the infiltration result of the battery to be tested according to the first corresponding relation; and the infiltration result represents the infiltration rate of the battery to be measured.

In a fourth aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:

In a fifth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:

In a sixth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic diagram of the internal structure of a test apparatus according to some embodiments of the present application;

FIG. 2 is a flow chart of a method for testing battery infiltration according to some embodiments of the present disclosure;

FIG. 3 is a flow chart of another method for testing battery infiltration according to some embodiments of the present disclosure;

FIG. 4 is a schematic diagram of a curve of a first correspondence relationship according to some embodiments of the present application;

FIG. 5 is a flow chart of another method for testing battery infiltration according to some embodiments of the present disclosure;

FIG. 6 is a schematic diagram of a curve of a second correspondence relationship according to some embodiments of the present application;

FIG. 7 is a flow chart of another method for testing battery infiltration according to some embodiments of the present disclosure;

FIG. 8 is a schematic diagram of a curve of a second correspondence relationship according to some embodiments of the present application;

FIG. 9 is a flow chart of another method for testing battery infiltration according to some embodiments of the present disclosure;

FIG. 10 is a schematic diagram of a first correspondence and infiltration behavior model according to some embodiments of the present disclosure;

FIG. 11 is a flow chart of another method for testing battery infiltration according to some embodiments of the present disclosure;

FIG. 12 is a schematic diagram of a first correspondence and infiltration behavior model according to some embodiments of the present disclosure;

FIG. 13 is a schematic illustration of a wetting process of a battery under test according to some embodiments of the present application;

FIG. 14 is a flow chart of another method for testing battery infiltration according to some embodiments of the present disclosure;

FIG. 15 is a schematic diagram of a curve of initial correspondence according to some embodiments of the present application;

FIG. 16 is a schematic diagram of a battery infiltration testing apparatus according to some embodiments of the present disclosure;

FIG. 17 is a schematic diagram of a battery infiltration testing apparatus according to some embodiments of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

At present, in the battery production and manufacturing process, after the electrolyte solution is injected, the electrolyte solution needs to be kept stand for a period of time to ensure that the pole piece and the diaphragm are fully soaked. The insufficient infiltration can cause problems such as black spot lithium precipitation and the like, thereby causing the performance reduction and the safety risk of the battery; too long a soak time can extend the battery production cycle, resulting in increased battery manufacturing costs. Testing the electrolyte wetting rate of the cell can therefore optimize the cell manufacturing process. In addition, as the energy density requirements of the battery are continuously increased by users, higher and higher requirements are placed on the design of the battery, and higher coating weights of the electrode sheets, higher compacted densities of the electrode sheets, and higher or longer batteries are beneficial to realizing high energy density, but the soaking rate of the electrolytic solution is slow. Therefore, there is a need for a method to test the wetting rate of an electrolyte solution in a battery to identify key factors affecting wetting, thereby optimizing the design of the battery structure to achieve a battery that combines high energy density with high wetting rate. In a word, the test infiltration rate has important significance for both the optimization of the battery production process and the optimization of the battery design.

Based on the above consideration, the inventor has conducted intensive studies to design a battery infiltration test method, by obtaining the imbibition weight and time curve of the battery in the infiltration process and extracting key parameters capable of representing the infiltration rate of the battery through data processing, quantitative test of the battery infiltration rate is achieved, and compared with the traditional method for performing the infiltration test on the electrode of the battery, the infiltration rate test method provided by the proposal can obtain the battery infiltration rate more accurately.

The method for testing the battery infiltration rate can be applied to testing equipment shown in fig. 1, wherein the testing equipment can be a terminal, computer equipment or an industrial personal computer. The internal structure of the test apparatus may be as shown in fig. 1. The test equipment comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the test device is configured to provide computing and control capabilities. The memory of the test equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the test device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program when executed by a processor implements a method for testing battery wetting. The display screen of the test equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the test equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the test equipment, and can also be an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the structure shown in fig. 1 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the test apparatus to which the present application is applied, and that a particular test apparatus may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

In some embodiments of the present application, as shown in fig. 2, a method for testing battery infiltration is provided, and the method is applied to the test apparatus in fig. 1 for illustration, and includes the following steps:

s101, acquiring a first corresponding relation between weight data and time data of the battery to be tested immersed in the electrolytic solution.

The weight data represents weight data corresponding to the change of the weight of the electrolyte solution or weight data corresponding to the change of the weight of the battery to be measured when the battery to be measured absorbs the electrolyte solution in the process of soaking the battery to be measured into the electrolyte solution. The time data represents the time from beginning to ending of the infiltration of the battery under test. The first correspondence relationship indicates a time-dependent change relationship of the weight of the electrolyte solution when the battery to be measured absorbs the electrolyte solution, and may also indicate a time-dependent change relationship of the weight of the battery to be measured when the battery to be measured absorbs the electrolyte solution. The first correspondence may be represented using a curve or a graph.

In this embodiment, the test device may infiltrate the battery to be tested into the electrolytic solution, and test and record the weight of the electrolytic solution by using the weighing device, where the test obtains weight data and time data of the electrolytic solution; optionally, the testing device may also use the weighing device to test and record the weight of the battery to be tested, where the test obtains the weight data and the time data of the battery to be tested. The test equipment can generate a curve or a chart based on the obtained weight data and time data in a fitting way; optionally, the testing device may dynamically display a first correspondence between weight data and time data of the battery to be tested immersed in the electrolytic solution on the display interface in a process of immersing the battery to be tested; optionally, the testing device may visually display, on the display interface, a first correspondence between weight data and time data of the battery to be tested immersed in the electrolytic solution after the battery to be tested is immersed.

S102, determining the infiltration result of the battery to be tested according to the first corresponding relation.

The infiltration result represents the infiltration rate of the battery to be measured; alternatively, the infiltration result may represent the infiltration rate of the battery under test at each infiltration stage, for example, the infiltration rate at the rapid infiltration stage, the infiltration rate at the stable infiltration stage, the infiltration rate at the difficult infiltration stage, and so on.

In this embodiment, when the testing device obtains the first corresponding relationship between the weight data and the time data of the battery to be tested immersed in the electrolytic solution based on the foregoing steps, the immersion result of the battery to be tested may be further obtained by analyzing the change condition of the weight in the first corresponding relationship with time; optionally, the testing device may extract a key parameter from the first corresponding relationship, and then calculate to obtain a wetting result of the battery to be tested by analyzing the key parameter or using the key parameter as reference data; optionally, the testing device may process the first corresponding relation, analyze the processed first corresponding relation, extract a key parameter from the first corresponding relation, and calculate to obtain a wetting result of the battery to be tested by analyzing the key parameter or using the key parameter as reference data; optionally, the measurement device may further input the first correspondence to a prediction model to perform prediction, so as to obtain an infiltration result of the battery to be measured, where the prediction model may be obtained in advance based on training of a neural network or a machine learning model. When the test equipment obtains the infiltration result based on any method, the infiltration result can be used for representing the infiltration rate of the battery to be tested in each infiltration stage.

In some embodiments, the above-mentioned wetting result indicates a wetting rate of the battery to be tested in each wetting stage, and therefore, the above-mentioned wetting result includes at least one of a wetting time period of the battery to be tested, a time period of the first wetting stage, a wetting rate of the first wetting stage, and a time period of the second wetting stage.

Wherein the infiltration rate of the first infiltration stage is greater than the infiltration rate of the second infiltration stage. The immersion time of the battery to be measured indicates the time period from the beginning of immersion to the end of immersion of the battery to be measured in the electrolytic solution. The first infiltration stage represents an infiltration stage with relatively high infiltration speed, and can also be called an infiltration climbing stage; the second infiltration stage represents an infiltration stage with a relatively slow infiltration rate, and may also be referred to as a difficult infiltration stage.

Different infiltration results correspond to different analysis methods, i.e. different implementation manners of S102, and the following embodiments will specifically describe several implementation manners of S102.

First implementation of S102: when the infiltration result includes the infiltration period, S102 "determine the infiltration result of the battery to be measured according to the first correspondence", as shown in fig. 3, includes:

And S201, removing data of which the weight is in a preset weight range from the first corresponding relation to obtain the processed first corresponding relation.

The preset weight range represents a weight range in which the weight of the electrolyte does not change significantly when the electrolyte is absorbed by the battery to be tested, or a weight range in which the weight of the battery to be tested does not change significantly when the electrolyte is absorbed by the battery to be tested.

In this embodiment, when the testing device obtains a first correspondence between weight data and time data of the battery to be tested immersed in the electrolytic solution, a preset weight range may be determined by analyzing data with small weight change in the first correspondence, then weight data with weight within the preset weight range is removed from the first correspondence, meanwhile time data corresponding to the weight data in the first correspondence is removed, and finally a processed first correspondence is constructed based on the removed weight data and time data. Optionally, when the testing device obtains a first correspondence between weight data and time data of the battery to be tested immersed in the electrolytic solution, the first correspondence may be displayed to a user, a preset weight range is determined based on a selection operation of the user, then weight data with weight within the preset weight range is removed from the first correspondence, time data corresponding to the weight data in the first correspondence is removed, and finally a processed first correspondence is constructed based on the weight data and the time data after the removal. When the measurement device obtains the processed first corresponding relation, the first corresponding relation can be displayed in a curve or icon mode. For example, referring to the schematic diagram shown in fig. 4, the curve shown in fig. 4 shows the first correspondence relationship, in which the weight of the battery to be measured does not change significantly after about 8 hours (L2 curve in the figure), and the curve in which the weight does not change significantly is removed, so as to obtain the first correspondence relationship after treatment (L1 curve in the figure). It should be noted that, in the above method, the selection operation for the user may include the user performing a selection operation of a curve range on a curve corresponding to the first correspondence, or performing a data selection operation on a curve to determine a preset weight range, for example, the user clicking two end points of an L2 curve on the curve shown in fig. 4 to determine the preset weight range determined by the two end points.

S202, determining the duration corresponding to the maximum moment in the processed first corresponding relation as the infiltration duration.

In this embodiment, since the data with the weight within the preset weight range indicates that the weight of the electrolyte does not change significantly when the battery to be measured absorbs the electrolyte, or the weight of the battery to be measured does not change significantly when the battery to be measured absorbs the electrolyte, the first correspondence after the data removal process indicates that the weight of the electrolyte or the weight of the battery to be measured changes with time from the beginning of infiltration to the end of infiltration. Therefore, the minimum time in the processed first corresponding relation is the infiltration start time, the maximum time in the processed first corresponding relation is the infiltration end time, and the duration corresponding to the maximum time in the processed first corresponding relation, namely the duration between the minimum time and the maximum time, namely the duration from the infiltration start to the infiltration end of the battery to be measured, namely the infiltration duration. In the actual measurement process, when the measurement equipment acquires the processed first corresponding relation, the minimum moment and the maximum moment can be extracted from the first corresponding relation, and the difference between the two moments is taken, so that the infiltration time length of the battery to be measured can be obtained.

Second implementation of S102: when the infiltration result includes the duration of the first infiltration stage, S102 "determine the infiltration result of the battery to be measured according to the first correspondence", as shown in fig. 5, includes:

s301, converting the time data in the first corresponding relation to obtain a second corresponding relation.

The second corresponding relation comprises weight data and time data of a linear relation; alternatively, the time value in the second corresponding relationship and the time value in the first corresponding relationship may be a quadratic multiple relationship, or may be other multiple relationships, so long as the second corresponding relationship may include weight data and time data of a linear relationship. The second corresponding relation represents the change relation of the weight of the electrolyte solution along with time when the electrolyte solution is absorbed by the battery to be tested, and also represents the change relation of the weight of the battery to be tested along with time when the electrolyte solution is absorbed by the battery to be tested. The second correspondence may be represented using a curve or an icon.

In this embodiment, when the testing device obtains the first correspondence between the weight data and the time data of the battery to be tested immersed in the electrolytic solution based on the foregoing steps, the time data in the first correspondence may be further converted to obtain the second correspondence; the time data in the first corresponding relation can be subjected to quadratic multiple processing or other multiple processing to obtain converted time data, and the second corresponding relation is constructed based on the converted time data and weight data corresponding to the original time. In practice, the time data in the first corresponding relationship is converted, that is, the time coordinate axis in the first corresponding relationship is converted, optionally, the time coordinate in the first corresponding relationship may be subjected to a quadratic multiple process or other multiple processes to obtain a converted time coordinate axis, and then the second corresponding relationship may be constructed based on the converted time coordinate axis and the original weight coordinate axis. For example, referring to the schematic diagrams shown in fig. 4 and fig. 6, the curve shown in fig. 4 represents a first corresponding relationship, and after the time data in the first corresponding relationship shown in fig. 4 is subjected to a quadratic multiple conversion, a curve of a second corresponding relationship shown in fig. 6 is obtained, where a curve L3 represents a linear relationship in the second corresponding relationship.

S302, determining the duration of a first infiltration stage of the battery to be tested according to the second corresponding relation.

In this embodiment, when the test device obtains the second correspondence based on the foregoing steps, since the second correspondence is a correspondence after time data conversion, the second correspondence includes weight data and time data of a linear relationship, where the weight data and the time data of the linear relationship include data corresponding to a stage where the infiltration speed of the battery to be tested is relatively fast in the infiltration process, that is, data of the first infiltration stage. Based on the analysis, the testing device can extract weight data and time data which can represent the battery to be tested in the first soaking stage from the second corresponding relation through analysis, and acquire the duration of the first soaking stage of the battery to be tested through analysis or processing the data; optionally, when the testing device obtains the second corresponding relationship based on the foregoing steps, the processing such as denoising and outlier removal may be performed on the second corresponding relationship, then the weight data and the time data that can represent the weight data and the time data of the battery to be tested in the first infiltration stage are extracted from the second corresponding relationship after analysis, and the duration of the first infiltration stage of the battery to be tested is obtained by analyzing the data or processing the data. Optionally, the measurement device may further input the second correspondence to a prediction model to perform prediction, so as to obtain an infiltration result of the battery to be measured, where the prediction model may be obtained in advance based on training of a neural network or a machine learning model.

Further, in some embodiments of the present application, there is further provided an implementation manner of S302, as shown in fig. 7, where the implementation manner includes:

s401, determining a first straight line according to weight data and time data containing linear relations in the second corresponding relation.

In this embodiment, when the test device obtains the second correspondence, weight data and time data including the linear relationship may be extracted therefrom, and then a first straight line is generated based on fitting of the extracted weight data and time data of the linear relationship; optionally, the test device may further analyze the extracted weight data and time data including the linear relationship to obtain data capable of indicating that the infiltration rate of the battery to be tested is relatively fast in the infiltration process, and then fit and generate the first straight line based on the data capable of indicating that the infiltration rate of the battery to be tested is relatively fast in the infiltration process. Optionally, the test device may extract data with time within a preset time range from the data with linear relationship, where the preset time range may be determined according to a test requirement, for example, extract data within a time corresponding to a pre-infiltration period, where the data may represent data with a relatively fast infiltration rate of the battery to be tested. In the determining of the first straight line, for example, the data in the initial stage of infiltration may be removed to reduce the influence of the initial unstable data on the test accuracy, and then the first straight line may be determined based on the weight data and the time data of the linear relationship included in the processed second corresponding relationship. For example, fig. 8 is a schematic diagram of a graph in which L4 is a first straight line generated from data of a linear relationship of the L3 portion.

S402, determining the duration of a first infiltration stage of the battery to be tested according to time data corresponding to the superposition part of the curve corresponding to the second corresponding relation and the first straight line.

In this embodiment, when the test device obtains the first straight line, the curve corresponding to the second corresponding relationship and the first straight line may be further compared, data corresponding to a superposition portion of the curve corresponding to the second corresponding relationship and the first straight line may be extracted from the first straight line, and a duration corresponding to a maximum moment in time data in the data portion may be determined as a duration of the first infiltration stage of the battery to be tested. Optionally, when the testing device obtains the first straight line, the curve corresponding to the second corresponding relation and the first straight line may be displayed at the same time, and then a coincident part curve of the curve corresponding to the second corresponding relation and the first straight line may be determined according to a selection operation of the user on the curve, time data corresponding to the part curve may be extracted, and a duration corresponding to a maximum moment in the time data may be used as a duration of the first soaking stage of the battery to be tested. It should be noted that, in the above method, the selection operation for the user may include the user performing a selection operation of a curve range on the curve corresponding to the second correspondence and the first line, or performing a data selection operation on the curve to determine a coincident portion curve, for example, the user first determines, on the curve shown in fig. 8, a time Q when the first line L4 deviates from the curve S corresponding to the second correspondence, and determines a duration corresponding to the time Q as a duration of the first soaking stage of the battery to be tested (about 1.2 hours in the figure).

Optionally, when the measuring device obtains the duration of the first impregnation stage of the battery to be measured based on the method described in the embodiment of fig. 5, the impregnation rate of the first impregnation stage may be further obtained.

In this embodiment, since the duration of the first impregnation stage of the battery to be measured represents the corresponding duration of the stage in which the impregnation climbing speed of the battery to be measured is relatively high, and the duration of the first impregnation stage is determined by the time data of the overlapping portion of the curves of the first straight line and the second corresponding relationship, the slope of the first straight line can directly represent the impregnation climbing rate of the battery to be measured, that is, the impregnation rate of the first impregnation stage of the battery to be measured.

Third implementation of S102: when the infiltration result includes the duration of the first infiltration stage, the embodiment of the present application further provides a method for determining the duration of the first infiltration stage, that is, S102 "determine the infiltration result of the battery to be measured according to the first correspondence", as shown in fig. 9, where the method includes:

s501, acquiring a corresponding infiltration behavior model of a battery to be tested.

The infiltration behavior model is used for representing a nonlinear relationship between weight data and time data of the battery to be measured infiltrated into the electrolytic solution. Alternatively, the infiltration behavior model may represent the infiltration behavior of the electrolytic solution in the porous material, and specifically may be described by a Lucas-Washburn model (hereinafter, abbreviated as LW model), which may be represented using the following relationships (1) - (2):

（1）；/>

（2）；

wherein, the liquid crystal display device comprises a liquid crystal display device,

indicating the weight of the electrolytic solution; />

Representing the density of the electrolytic solution; />

Represents the cross-sectional area of the battery; />

Indicating the wetting rate of the electrolytic solution in the porous electrode; />

The pole piece gap rate in the battery is represented; />

Representing the effective pore size of the electrodes in the cell; />

Represents the surface tension of the electrolytic solution; />

Represents the viscosity of the electrolytic solution; />

Represents the contact angle of the electrolytic solution with the porous electrode.

The separator and the pole piece in the battery to be tested are porous structures, so the battery is suitable for an LW model. Parameters in the present embodiment

Can be treated as a constant which does not vary with time, thus, the weight of the electrolytic solution>

Is in a linear relationship with t 0.5, and the weight of the electrolytic solution is ≡>

And t is a nonlinear relation. For example, in the graph of the second correspondence relationship described in fig. 8, the correspondence relationship (corresponding curve of the linear relationship of L3 in the figure) between the weight data and the time data in the early stage of infiltration can satisfy the LW model, and corresponds to the imbibition process of the battery to be measured into the electrolyte, that is, the climbing process from the bottom to the upper part of the battery to be measured, the later weight no longer changes with time, which means that imbibition of the battery to be measured is completed.

In this embodiment, the test device may obtain material parameters of the battery to be tested and material parameters of the electrolytic solution in advance, for example, obtain density of the electrolytic solution, surface tension of the electrolytic solution, viscosity of the electrolytic solution, contact angle of the electrolytic solution with the porous electrode, cross-sectional area of the battery to be tested, porosity of a pole piece in the battery to be tested, effective aperture of the electrode in the battery to be tested, and the like, and then generate an infiltration behavior model corresponding to the battery to be tested based on fitting of these parameters, that is, substituting these parameters into the above relational expressions (1) and (2) to generate the infiltration behavior model corresponding to the battery to be tested.

S502, determining the duration of a first infiltration stage of the battery to be tested according to the first corresponding relation and the infiltration behavior model.

In this embodiment, when the testing device obtains the first correspondence and the infiltration behavior model based on the foregoing steps, that is, the actually measured imbibition data and the theoretical imbibition data are obtained, and then the duration of the first infiltration stage of the battery to be tested can be determined by analyzing the data corresponding to the first correspondence and the infiltration behavior model.

Further, in some embodiments of the present application, two methods for determining a duration of a first impregnation stage of a battery to be tested according to a first correspondence and an impregnation behavior model are provided, namely, the first method includes: and determining the duration of the first soaking stage of the battery to be tested according to the time data corresponding to the superposition part of the first curve and the second curve.

In this embodiment, when the test device obtains the first curve corresponding to the first correspondence and the second curve corresponding to the infiltration behavior model, coincidence data may be further extracted from the data corresponding to the two curves, time data may be further extracted from the coincidence data, and finally, the duration corresponding to the maximum moment in the time data is taken as the duration of the first infiltration stage of the battery to be tested. Optionally, the test device may further display a first curve corresponding to the first correspondence and a second curve corresponding to the infiltration behavior model, and determine, according to a selection operation of a user, a time when the second curve deviates from the first curve, where data before the time is data corresponding to a superposition portion of the first curve and the second curve, so that a duration corresponding to the time may be directly determined as a duration of the first infiltration stage of the battery to be tested. For example, referring to the schematic diagram shown in fig. 10, the S1 curve is an actual liquid absorption curve, i.e. a first curve of a first correspondence; the S2 curve is an LW theoretical imbibition curve, namely a second curve corresponding to the infiltration behavior model. The time point when the second curve S2 deviates from the first curve S1 is P, and the duration corresponding to the time point P is the duration of the first infiltration stage, which is about 1.2 hours.

The second method for determining the duration of the first impregnation stage of the battery to be tested according to the first correspondence and the impregnation behavior model, as shown in fig. 11, includes:

s601, carrying out difference value operation on weight data corresponding to the first curve and weight data corresponding to the second curve.

In this embodiment, when the testing device obtains the first curve and the second curve based on the foregoing steps, the difference value calculation may be directly performed on the weight data corresponding to the first curve and the weight data corresponding to the second curve, so as to obtain the difference value data.

S602, determining the duration of a first soaking stage of the battery to be tested according to the corresponding relation between the weight data and the time data after the difference value operation.

In this embodiment, since the difference data obtained in the above steps includes weight difference data, the test device may construct a new correspondence, that is, a new curve, based on the difference data and the time data that corresponds to the previous time data, then determine time data in which the difference data increases rapidly by analyzing the new correspondence or curve, and then determine the duration corresponding to the time data as the duration of the first soaking stage of the battery to be tested. Optionally, the testing device may further display a new curve, and obtain the duration of the first soaking stage of the battery to be tested according to the selection operation of the user on the new curve; specifically, the user may determine a point of the new curve corresponding to the sudden increase of the weight data, and determine the duration corresponding to the determined point as the duration of the first soaking stage of the battery to be tested. For example, referring to the schematic diagram shown in fig. 12, the curve is a curve of a corresponding relationship constructed according to the difference data and the time data, where M points are points of abrupt change of the curve, the moment corresponding to the M points is the moment when the difference data increases rapidly, and the duration determined according to the moment corresponding to the M points is the duration of the first soaking stage of the battery to be tested.

After obtaining the duration of the impregnation of the battery to be measured and the duration of the first impregnation stage according to the embodiments of fig. 3 to 12, the duration of the second impregnation stage may also be determined. In the actual infiltration process, the method comprises two stages, namely a first infiltration stage and a second infiltration stage; the first infiltration stage comprises an initial infiltration stage, a middle infiltration stage and a later infiltration stage; the initial stage of infiltration corresponds to the initial infiltration period of the battery to be measured (see a shown in fig. 13), and in the initial stage of infiltration, the electrolytic solution climbs to the bottom of the battery to be measured; after the battery to be measured is soaked for a period of time (see b shown in fig. 13), the middle stage of soaking is represented by the climbing height of the electrolyte solution approximately reaching the middle part of the battery to be measured; the later stage of infiltration corresponds to the cell to be measured being infiltrated for a longer period of time (see c shown in fig. 13), which is represented by the climbing height of the electrolytic solution to the top of the cell to be measured, but there is a region (region R in c shown in fig. 13) inside the cell to be measured, which is not absorbed by the electrolytic solution; the first infiltration stage represents a time period from the beginning of climbing of the electrolytic solution from the bottom of the battery to be tested to the ending of climbing to the top; the second infiltration stage represents the time period taken for the electrolytic solution to infiltrate in the difficult-to-infiltrate region (e.g., the time period required for the R region in c shown in fig. 13).

In this embodiment, the duration of the first infiltration stage corresponds to the stages a, b and c in fig. 13, which indicates the stage in which the battery to be measured quickly climbs during the infiltration process, so the shorter the duration of the first infiltration stage, the faster the infiltration rate; the immersion time period of the battery to be measured corresponds to the stages a, b, c and d in fig. 13, and is a sufficient immersion time period, i.e. a time period required for the electrical measurement battery to be fully immersed. Therefore, when the measurement device obtains the duration of the to-be-measured battery and the duration of the first infiltration stage according to the embodiments of fig. 3 to 12, the difference operation may be performed on the duration of the to-be-measured battery and the duration of the first infiltration stage to obtain the duration of the second infiltration stage, which corresponds to the duration of the stage d in fig. 13, that is, the duration of the infiltration region difficult to infiltrate. The difficult to infiltrate area is generally contributed by two parts: first, infiltration is difficult due to any defect inside the cell; second, air is hardly dissolved in the electrolyte, and the cell infiltration process is accompanied by the process of exhausting gas from the cell, and if gas in a certain area is not timely exhausted, the gas is sealed by the electrolyte, so that infiltration of the area becomes difficult. Therefore, for the phenomenon, quantitative analysis is performed on the infiltration process of the difficult-to-infiltrate area, and a certain theoretical reference basis is provided for material and structural design and optimization of the battery.

In practical application, when the battery to be tested is immersed in the electrolyte solution for testing, the electrolyte solution is volatile, and the volatilization amount of the electrolyte solution directly affects the accuracy of the testing, so considering the volatility of the electrolyte solution, the embodiment of the application provides a method for accurately obtaining the first correspondence between the weight data and the time data of the battery to be tested immersed in the electrolyte solution, as shown in fig. 14, the method includes:

s701, acquiring an initial corresponding relation between weight data and time data of the battery to be tested immersed in the electrolytic solution.

Wherein, the initial corresponding relation represents the weight change relation of the electrolyte solution along with time when the battery to be tested absorbs the electrolyte solution. The initial correspondence may be represented using a curve or a graph.

In this embodiment, the test device may infiltrate the battery to be tested into the electrolytic solution, and test and record the weight of the electrolytic solution by using the weighing device, where the test results in weight data and time data of the electrolytic solution, and the weight data includes weight change data after the electrolytic solution is absorbed and volatilized; the test equipment can fit and generate a curve or a chart based on the weight data and the time data; optionally, the testing device can dynamically display the initial correspondence between the weight data and the time data of the battery to be tested immersed in the electrolyte on the display interface in the battery immersing process; optionally, the testing device may visually display an initial correspondence between weight data and time data of the battery to be tested immersed in the electrolytic solution on the display interface after the battery to be tested is immersed.

S702, determining the volatilization rate of the electrolytic solution according to the weight data and the time data which contain the linear relation in the initial corresponding relation.

Wherein, the data of the linear relation in the initial corresponding relation represents the data of the weight change with time when the electrolytic solution volatilizes.

In this embodiment, when the test device obtains the initial correspondence, the weight data and the time data including the linear relationship may be extracted therefrom, and then a straight line is generated by fitting based on the extracted weight data and time data of the linear relationship, and then the slope of the straight line is further used as the volatilization rate of the electrolytic solution. For example, as shown in fig. 15, in the later test period in fig. 15, the weight data and the time data are in a linear relationship, and correspond to the volatilization process of the electrolytic solution, when the battery is soaked, the electrolytic solution is not absorbed any more, and the volatilization rate of the electrolytic solution can be obtained by fitting the weight data and the time data in the later test period, and L5 in fig. 15 is a fitted straight line, and the slope of the straight line can represent the volatilization rate of the electrolytic solution, for example, the volatilization rate of the electrolytic solution is obtained as 1.0055g/h.

S703, processing the initial corresponding relation according to the volatilization rate to obtain a first corresponding relation.

In this embodiment, when the test device determines the volatilization rate of the electrolytic solution, the volatilization weight of the electrolytic solution at each moment in the infiltration process may be determined according to the volatilization rate, and the weight data in the initial correspondence may be modified according to the volatilization weight of the electrolytic solution at each moment. Specifically, since the weight data in the initial corresponding relationship includes not only the weight change after the electrolytic solution is absorbed by the battery, but also the volatilized weight change, the difference value operation can be performed between the weight value at each moment in the initial corresponding relationship and the volatilized weight at each moment to obtain the weight data after the electrolytic solution is absorbed by the battery, and then the first corresponding relationship is constructed based on the corresponding time data. For example, referring to an initial correspondence curve as shown in fig. 15, in which a linear straight line L5 represents the volatilization of the electrolytic solution, the volatilization rate of the electrolytic solution can be determined from the slope of the straight line L5. Fig. 4 is a graph after processing the initial relationship, i.e., a graph of the first corresponding relationship, in which the volatilization amount of the electrolytic solution is subtracted, reflecting the relationship between the actual liquid absorption amount and time of the battery to be tested.

In some embodiments of the present application, as shown in fig. 16, there is further provided a battery infiltration testing apparatus, including: a weigh platform 10, a container 20, and a stand 30; wherein a container 20 is placed on the weighing platform 10 for holding a solution for electrolytic solution; the support 30 is used for supporting the battery to be tested to be placed in the electrolytic solution in the container 20; the weighing platform 10 is used for weighing the container 20 to obtain the corresponding relation between the weight data and the time data of the battery to be measured immersed in the electrolyte; the corresponding relation is used for determining the infiltration result of the battery to be tested; the wetting result represents the wetting rate of the cell to be tested.

Wherein, the container 20 may be an integrated open-top container, so that the battery to be tested can be immersed into the electrolyte through the open-top container, and the specific size of the open-top can be determined according to the actual test requirements; optionally, the container 20 may also be a container with a top cover, so that the battery to be tested can be easily immersed into the electrolytic solution by opening the top cover, and an opening may be provided on the top cover of the container 20 to reduce the volatilization speed of the electrolytic solution to a certain extent, thereby reducing the influence of the volatilization of the electrolytic solution on the test accuracy.

In this embodiment, when it is required to perform an infiltration test on a battery to be tested, the container may be placed on the weighing platform first, then an electrolytic solution is injected into the container through the top opening or in other manners, and the battery to be tested is suspended and supported in the electrolytic solution by using the support, after the infiltration is started, the weight data and the corresponding time data on the weighing platform are recorded in real time, until the weight data does not change significantly for a period of time, the recording is stopped, and finally the correspondence between the weight data and the time data is obtained, so that the infiltration result of the battery to be tested is determined by using the method described in the embodiments of fig. 2-14 according to the correspondence, and the infiltration result may represent the infiltration rate of the infiltration process.

Optionally, the stand 30 in the test apparatus shown in fig. 16 includes a supporting member 31 and a connecting member 32 connected to the supporting member, the supporting member 31 is connected to the battery to be tested through the connecting member 32, the container 20 includes a top cover 21 and a case 22, an opening 23 is provided in the top cover 21, and the connecting member 32 passes through the opening 23.

The connecting piece 32 may be a different connecting piece such as a steel wire, a steel rope, an iron chain and the like; the size of the openings 23 may be determined according to practical measurement requirements, for example, in order to reduce the volatilization amount of the electrolytic solution, smaller openings may be provided as much as possible. However, in the practical test, an opening may be disposed at the center of the top cover 21 of the container 20, and the connecting piece 32 is connected with the battery to be tested through the opening 23, so that the connecting piece 32 can be prevented from contacting the top cover 21 of the container 20, otherwise, the weighing platform 10 is disturbed to weigh, so that the size of the opening 23 is matched with that of the connecting piece 32, the disturbance is reduced, and meanwhile, the volatilization amount of the electrolytic solution is reduced as much as possible, so that the influence of the volatilization amount of the electrolytic solution on the measurement in the measurement process is reduced, and the measurement accuracy can be improved to a certain extent.

In summary, the method and the device for battery infiltration provided in all embodiments provide a method and a device for battery infiltration test, which can obtain a weight change-time curve. The quantitative evaluation of the infiltration rate is realized, a proper data processing mode is provided, the infiltration duration or rate of each stage of the battery infiltration process can be obtained, the infiltration process of the electrolytic solution is decomposed, the electrolytic solution rapidly climbs and the slow infiltration process of the difficult-to-infiltrate area is included, the measurement result is successfully associated with the infiltration detailed process, the quantitative evaluation of the infiltration rate of the battery by multiple indexes is realized, and the infiltration measurement accuracy is improved to a certain extent.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the embodiment of the application also provides a battery infiltration testing device for realizing the above related battery infiltration testing method. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation of the embodiment of the device for testing battery infiltration provided below may be referred to the limitation of the method for testing battery infiltration above, and will not be repeated here.

In one embodiment, as shown in fig. 17, there is provided a battery infiltration testing apparatus, comprising:

the obtaining module 40 is configured to obtain a first correspondence between weight data and time data of the battery to be measured immersed in the electrolytic solution.

The determining module 50 is configured to determine an infiltration result of the battery to be tested according to the first correspondence; and the infiltration result represents the infiltration rate of the battery to be measured.

The modules in the battery infiltration testing apparatus may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:

In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:

In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as Static Random access memory (Static Random access memory AccessMemory, SRAM) or dynamic Random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims

1. The battery infiltration testing method is characterized by comprising the following steps of:

2. The method of claim 1, wherein the wetting result comprises at least one of a wetting duration of the battery to be tested, a duration of a first wetting phase, a wetting rate of the first wetting phase, and a duration of a second wetting phase; the infiltration rate of the first infiltration stage is greater than the infiltration rate of the second infiltration stage.

3. The method of claim 2, wherein the infiltrating result includes the infiltrating period, and the determining the infiltrating result of the to-be-measured battery according to the first correspondence includes:

4. The method of claim 2, wherein the infiltrating result includes a duration of the first infiltrating stage, and the determining the infiltrating result of the to-be-measured battery according to the first correspondence includes:

5. The method of claim 4, wherein determining the duration of the first infiltration phase of the battery under test according to the second correspondence comprises:

6. The method of claim 5, wherein the wet result further comprises a wet rate of the first wet stage, the method further comprising:

7. The battery infiltration testing method of claim 2, further comprising:

8. The method of claim 2, wherein the infiltrating result includes a duration of the first infiltrating stage, and the determining the infiltrating result of the to-be-measured battery according to the first correspondence includes:

9. The method of claim 8, wherein determining the duration of the first infiltration phase of the battery under test according to the first correspondence and the infiltration behavior model comprises:

10. The method for testing battery infiltration according to claim 9, wherein determining the duration of the first infiltration stage of the battery to be tested according to the first curve corresponding to the first correspondence and the second curve corresponding to the infiltration behavior model includes:

11. The method for testing battery infiltration according to claim 9, wherein determining the duration of the first infiltration stage of the battery to be tested according to the first curve corresponding to the first correspondence and the second curve corresponding to the infiltration behavior model includes:

12. The method of claim 1, further comprising:

acquiring an initial corresponding relation between weight data and time data of the battery to be tested immersed in the electrolytic solution;

13. A battery infiltration testing apparatus, the apparatus comprising: a weighing platform, a container and a bracket;

the weighing platform is used for weighing the container to obtain a corresponding relation between weight data and time data of the battery to be tested immersed in the electrolytic solution; the corresponding relation is used for determining the infiltration result of the battery to be tested; and the infiltration result represents the infiltration rate of the battery to be measured.

14. The battery infiltration testing apparatus of claim 13, wherein the stand comprises a support member and a connector member connected to the support member, the support member being connected to the battery under test via the connector member, the container comprising a top cover and a housing, the top cover being provided with an aperture through which the connector member passes.

15. A battery infiltration testing apparatus, the apparatus comprising:

16. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the battery infiltration testing method of any one of claims 1 to 12.

17. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the battery infiltration testing method of any one of claims 1 to 12.

18. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the battery infiltration testing method of any one of claims 1 to 12.