CN113884934B - Lithium battery self-discharge screening method and device, electronic equipment and storage medium - Google Patents
Lithium battery self-discharge screening method and device, electronic equipment and storage medium Download PDFInfo
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- 238000012216 screening Methods 0.000 title claims abstract description 95
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000003860 storage Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims description 13
- 230000002159 abnormal effect Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000011160 research Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000014509 gene expression Effects 0.000 description 3
- 238000007405 data analysis Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The invention discloses a lithium battery self-discharge screening method, a lithium battery self-discharge screening device, electronic equipment and a storage medium. The self-discharge screening method of the lithium battery comprises the following steps: grouping the battery cells to be tested, wherein the basic information of each group of battery cells to be tested is the same; acquiring a self-discharge speed value of the battery cell to be tested; determining the multiplying power of the battery cells to be tested in each group according to the maximum self-discharge speed value and the average self-discharge speed value of the battery cells to be tested; and screening unqualified battery cells in the battery cells to be tested according to the multiplying power and the self-discharge speed value of each battery cell to be tested. The scheme of the invention improves the accuracy and precision of the self-discharge screening technology.
Description
Technical Field
The embodiment of the invention relates to a battery production technology, in particular to a lithium battery self-discharge screening method, a device, electronic equipment and a storage medium.
Background
Currently, lithium batteries are widely used in various fields, such as new energy automobiles, consumer electronics, electric energy storage and aerospace, and the principle of the lithium batteries is that the lithium batteries are used as a novel energy storage device to convert electric energy into chemical energy during charging and to convert the chemical energy into electric energy during discharging. However, in the open state, the lithium battery has a phenomenon that its storage capacity is slowly attenuated, which is called a self-discharge phenomenon of lithium ions.
The self-discharge phenomenon of the lithium battery is unavoidable, but the battery with overlarge self-discharge affects the problems of battery core matching, cycle life, safety and the like, and the battery with overlarge self-discharge needs to be screened out by a self-discharge screening technology, so that the quality of the shipment battery is ensured. At present, most battery manufacturers adopt a self-discharge screening technology which is a K value screening method, but the method is easy to misjudge and has lower screening precision.
Disclosure of Invention
The invention provides a lithium battery self-discharge screening method, a device, electronic equipment and a storage medium, which are used for realizing the improvement of the accuracy and precision of battery screening.
In a first aspect, an embodiment of the present invention provides a lithium battery self-discharge screening method, where the lithium battery self-discharge screening method includes: grouping the battery cells to be tested, wherein the basic information of each group of battery cells to be tested is the same; acquiring a self-discharge speed value of the battery cell to be tested; determining the multiplying power of the battery cells to be tested in each group according to the maximum self-discharge speed value and the average self-discharge speed value of the battery cells to be tested; and screening unqualified battery cells in the battery cells to be tested according to the multiplying power and the self-discharge speed value of each battery cell to be tested.
Optionally, obtaining the self-discharge speed value of the to-be-measured cell includes: carrying out capacity division on the battery cell to be tested to obtain the real capacity of the battery cell to be tested; adjusting the battery cell to be tested to a first charge state; after the battery cell to be measured is kept stand for a first period of time at a first temperature, measuring first voltages at two ends of the battery cell to be measured; after the battery cell to be measured is kept stand for a second time period at a first temperature, measuring second voltages at two ends of the battery cell to be measured; and calculating the self-discharge speed value of the battery cell to be tested according to the second time period, the first voltage and the second voltage.
Optionally, determining the multiplying power of the cells to be tested in each group according to the maximum self-discharge speed value and the average self-discharge speed value of the cells to be tested, including: determining the maximum self-discharge speed value of each group of the battery cells to be tested; calculating the average self-discharge speed value of each group of the battery cells to be tested; and calculating the ratio of the maximum self-discharge speed value to the corresponding average self-discharge speed value to obtain the multiplying power of all the battery cells to be tested in the group.
Optionally, before screening the failed cells in the to-be-tested cells according to the multiplying power and the self-discharge speed value, the method further includes: and eliminating the abnormal battery cells according to the relative relation between the self-discharge speed value of the battery cells to be tested and a first preset value.
Optionally, screening unqualified cells in the cells to be tested according to the multiplying power and the self-discharge speed value of each cell to be tested, including: judging whether the multiplying power of the battery cell to be tested is larger than a second preset value, if so, entering the next step, otherwise, determining that the battery cell to be tested is a qualified battery cell; judging whether the self-discharge speed value of the battery cell to be tested is larger than a third preset value, if so, determining that the battery cell to be tested is an unqualified battery cell, otherwise, determining that the battery cell to be tested is a qualified battery cell.
Optionally, the basic information includes battery material, manufacturing lot number, and test counter point.
Optionally, the number of the battery cells to be tested in each group is any one of 10-30.
In a second aspect, an embodiment of the present invention further provides a lithium battery self-discharge screening device, where the lithium battery self-discharge screening device is configured to implement any of the lithium battery self-discharge screening methods of the first aspect, and the lithium battery self-discharge screening device includes: the system comprises a grouping module, a self-discharge speed value acquisition module, a multiplying power determination module and a screening module, wherein the grouping module is used for grouping the battery cells to be tested, and the basic information of each group of battery cells to be tested is the same; the self-discharge speed value acquisition module is used for acquiring the self-discharge speed value of the battery cell to be tested; the multiplying power determining module is used for determining multiplying power of the battery cells to be tested in each group according to the maximum self-discharge speed value and the average self-discharge speed value of the battery cells to be tested; the screening module is used for screening unqualified cells in the cells to be tested according to the multiplying power and the self-discharge speed value of each cell to be tested.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes: one or more processors; the storage means is for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the lithium battery self-discharge screening method as set forth in any of the first aspects.
In a fourth aspect, embodiments of the present invention also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements a lithium battery self-discharge screening method as any of the first aspects.
According to the lithium battery self-discharge screening method, device, electronic equipment and storage medium, the battery cells to be screened can be screened in groups, the research objects screened each time are a group of batteries, the basic information of the batteries can be guaranteed to be consistent due to the narrowing of the range of the research objects, the self-discharge speed value and multiplying power of the battery cells to be tested in the group are further calculated, the battery cells which are unqualified due to the self-discharge degree are screened according to the self-discharge speed value and multiplying power of the battery cells to be tested, the self-discharge screening of the lithium battery is achieved, the influence of environment and process variables can be eliminated to a greater extent through the group screening, the accuracy of the self-discharge screening technology is improved, in addition, misjudgment caused by the environment and process variables can be further reduced due to the screening standard of the introduction of multiplying power, and the screening precision is improved.
Drawings
Fig. 1 is a flowchart of a lithium battery self-discharge screening method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a screening principle according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for screening self-discharge of a lithium battery according to an embodiment of the present invention;
FIG. 4 is a normal distribution diagram according to the self-discharge velocity data in the database according to the embodiment of the present invention;
FIG. 5 is a statistical chart of self-discharge velocity values of a batch of cells to be tested according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a lithium battery self-discharge screening device according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As described in the background art, the existing lithium battery self-discharge screening method has the problems of misjudgment and low screening precision, and the inventor researches that the problems are caused by the fact that the K value of the lithium battery is not a fixed value, and is influenced by the chemical system and structure of the battery and also by a plurality of external environments, such as raw material sources, manufacturing processes, standing temperature, testing cabinet points and the like. When the external environment factors change, the standard value of the K value of the battery can be correctly screened by adjusting the standard value. However, since the influence factors are too many and some factors are not easy to identify and track, the existing self-discharge screening method screens a plurality of battery cells with different external environmental factors by using a unified standard, the identification accuracy of the battery with larger self-discharge rate is reduced, and the self-discharge rate of some batteries exceeds the standard value, but the self-discharge rates of a plurality of batteries with the same batch or external factors are concentrated, which is likely to be caused by some external factors, such as the accuracy of a test cabinet, and the batteries are not unqualified batteries and are easy to cause erroneous judgment.
Based on the above problems, the embodiment of the invention provides a lithium battery self-discharge screening method. Fig. 1 is a flowchart of a lithium battery self-discharge screening method according to an embodiment of the present invention, and fig. 2 is a schematic diagram of a screening principle according to an embodiment of the present invention. Referring to fig. 1, the lithium battery self-discharge screening method includes:
s101, grouping the battery cells to be tested, wherein the basic information of each group of battery cells to be tested is the same.
Specifically, the to-be-measured electric cores are grouped according to basic information, wherein the basic information can be manufacturing time, raw material batch, production line number and/or any other related information which can influence the self-discharge rate of the to-be-measured electric cores, the to-be-measured electric cores with the same basic information can be grouped into the same group, the number of the to-be-measured electric cores in each group is a fixed value, the to-be-measured electric cores exceeding the to-be-measured electric cores can be grouped into another group, and each group of to-be-measured electric cores can be 16 in an exemplary manner.
S102, acquiring a self-discharge speed value of the battery cell to be tested.
Specifically, the expression of the self-discharge velocity value is k=Δv/Δt; the delta V is the voltage difference (also called voltage drop) of the battery cell to be measured before and after standing, and the expression of the delta V is delta V=OCVs 1-OCV2, wherein OCV1 is the voltage at two ends of the battery cell to be measured before standing, and OCV2 is the voltage at two ends of the battery cell to be measured after standing; Δt is the rest time, that is, the time taken for the voltage of the cell to be measured to go from OCV1 to OCV2, and the expressions of Δt=t ocv2-tocv1,tocv2 and t ocv1 are the moments after and before rest, respectively.
S103, determining the multiplying power of the battery cells to be tested in the group according to the maximum self-discharge speed value and the average self-discharge speed value of each group of battery cells to be tested.
Specifically, the multiplying power can be the ratio of the maximum self-discharge speed of the battery cells to be tested in the group to the average value of the self-discharge speed, and the difference between the maximum self-discharge degree of the group and the average self-discharge degree of the battery cells to be tested in the group can be represented. If the multiplying power of a group of battery cells to be tested exceeds a preset multiplying power value, the condition that the self-discharge degree of each battery cell to be tested in the group is uneven is indicated, and the battery cells with the exceeding self-discharge rate possibly exist. If the multiplying power value of the battery cells to be tested is smaller than the preset multiplying power value, the condition that the self-discharge degree of each battery cell to be tested in the group is similar is indicated, and the battery cells with the exceeding self-discharge rate cannot exist.
S104, screening unqualified cells in the cells to be tested according to the multiplying power and the self-discharge speed value of each cell to be tested.
Specifically, referring to fig. 2, if the calculated multiplying power is greater than the preset multiplying power value and the self-discharge speed value is greater than the preset self-discharge speed value, and both conditions of the to-be-tested battery cell are satisfied (as in the shaded portion of fig. 2), it is indicated that there is a battery cell with a difference between the self-discharge degree and the average self-discharge degree of the group exceeding the standard in the group of the to-be-tested battery cell, and the self-discharge speed value of the to-be-tested battery cell is higher than the normal range, and the to-be-tested battery cell belongs to the unqualified battery cell. However, if the calculated multiplying power is not greater than the preset multiplying power value but the self-discharge speed value is greater than the preset self-discharge speed value, the self-discharge speed of the battery cell to be tested is higher than the normal range, but the self-discharge degree of each battery cell to be tested in the group of the battery cells to be tested is very small, and the battery cell to be tested belongs to the qualified battery cell.
According to the lithium battery self-discharge screening method, the battery cells to be tested are screened in groups, the research objects screened each time are a group of batteries, the basic information of the batteries can be guaranteed to be consistent through the reduction of the range of the research objects, the self-discharge speed value and the multiplying power of the battery cells to be tested in the group are further calculated, the battery cells which are unqualified due to the self-discharge degree are screened according to the self-discharge speed value and the multiplying power of the battery cells to be tested, the self-discharge screening of the lithium battery is achieved, the influence of environment and process variables can be eliminated to a greater extent through the group screening, the accuracy of the self-discharge screening technology is improved, and in addition, the misjudgment caused by the environment and the process variables can be further reduced due to the introduction of the screening standard of the multiplying power, and the screening precision is improved.
Fig. 3 is a flowchart of another method for screening self-discharge of lithium batteries according to an embodiment of the present invention, fig. 4 is a normal distribution diagram made according to self-discharge speed data in a database according to an embodiment of the present invention, and fig. 5 is a statistical chart of self-discharge speed values of a batch of cells to be tested according to an embodiment of the present invention. Referring to fig. 3, the lithium battery self-discharge screening method includes:
S201, grouping the battery cells to be tested, wherein the basic information of each group of battery cells to be tested is the same.
Specifically, the basic information includes battery materials, manufacturing processes and testing cabinet points, the battery materials of the same group of battery cells to be tested need to be in the same batch, the manufacturing processes are the same, and the testing cabinet points used for testing should be the same, so that differences among external environmental factors among the battery cells to be tested in the group are reduced as much as possible. The number of cells to be tested per group is any one of 10-30, and may be 16, for example.
S202, carrying out capacity division on the battery cell to be tested to obtain the real capacity of the battery cell to be tested.
Specifically, the capacity-dividing cabinet and other testing devices are adopted to carry out capacity-dividing test on the battery cells to be tested, and the battery cells to be tested in the same group need to adopt the same capacity-dividing cabinet and simultaneously carry out capacity-dividing test, so that the environmental difference between the battery cells in the same group is further reduced.
S203, adjusting the battery cell to be tested to a first charge state.
Specifically, the test device is used to charge or discharge the to-be-tested battery cells, so that all to-be-tested battery cells maintain a uniform state of charge, and preparation is made for subsequent measurement, and the first state of charge may be 80% soc, for example.
S204, after the battery cell to be measured is kept stand for a first period of time at a first temperature, measuring first voltages at two ends of the battery cell to be measured.
Specifically, the to-be-measured battery cell stands at the first temperature, and after the to-be-measured battery cell is kept for the first time period, the voltages at the two ends of the to-be-measured battery cell tend to be stable, so that the influence of the polarization voltage on the measurement result is reduced. At this time, the voltages at the two ends of the battery cell to be measured are measured and recorded as the first voltage. For example, the first temperature may be 20 degrees celsius, and the first period may be any period between 6 hours and 12 hours, wherein the first temperatures of the cells to be tested screened in the same batch should be kept at the same value.
S205, after the to-be-measured battery cell is kept stand for a second period of time at the first temperature, measuring second voltages at two ends of the to-be-measured battery cell.
Specifically, after the first voltage is measured, the to-be-measured battery cell needs to be kept still for a second time period at the first temperature, and self-discharge can occur in the to-be-measured battery cell in the standing process of the second time period, so that the voltage of the to-be-measured battery cell is changed. And after standing for a second time period, measuring the voltage at two ends of the battery cell to be measured, and recording the voltage as a second voltage. The second time period may be any time period between 24 hours and 120 hours, wherein the second time periods of the test cells screened in the same batch should be kept at the same value. Since the self-discharge degree of the cell to be tested is generally weak, a significant voltage drop can be detected only by standing for a long time, so the second period is longer than the first period.
S206, calculating the self-discharge speed value of the battery cell to be tested according to the second time period, the first voltage and the second voltage.
Specifically, the self-discharge speed value of the battery cell to be measured can be calculated according to the second time period, the first voltage and the second voltage, and the calculation formula is as follows: k2 = (V1-V2)/t, where V1 is the value of the first voltage, V2 is the value of the second voltage, and t is the value of the second time period. The self-discharge speed value can represent the self-discharge speed of the battery cell to be tested.
It should be noted that, in connection with fig. 4, when a worker studies the self-discharge degree in the background art, the worker would make a normal distribution diagram of the self-discharge speed value according to the data in the lithium battery database to determine the standard value of the self-discharge speed to be 0.24mV/h (only as an example), and then screen the battery according to the standard value of the self-discharge speed. Referring to fig. 5, the numbers of the same group of to-be-tested cells in fig. 5 are adjacent, the number of one group of to-be-tested cells is 16, and the self-discharge speed values of multiple groups of to-be-tested cells tested in the same batch are discrete, if the batch of to-be-tested cells are screened only according to the relative relationship between the self-discharge speed of the to-be-tested cells and the standard value of the self-discharge speed, the whole group of the last group of to-be-tested cells is screened out, which is obviously unreasonable. The self-discharge rate of the whole group of battery cells to be tested is higher, but the self-discharge rate is concentrated near a certain fixed value, and the phenomenon that the self-discharge rate is higher is normal is probably caused by external environmental conditions in the testing process of the group of battery cells to be tested, so that screening is not needed. Therefore, in order to improve the screening precision, the multiplying power is introduced as another screening standard to reduce the misjudgment of the last group of cells to be tested in fig. 4 and improve the screening precision.
S207, determining the maximum self-discharge speed value of each group of battery cells to be tested.
Specifically, according to the self-discharge speed value of the battery cell to be tested, the maximum self-discharge speed value in each group is determined.
S208, calculating the average self-discharge speed value of each group of battery cells to be tested.
Specifically, the average self-discharge speed value of each group of battery cells is obtained by averaging the self-discharge speed values of each group of battery cells to be tested.
S209, calculating the ratio of the maximum self-discharge speed value to the corresponding average self-discharge speed value, namely the multiplying power of all the battery cells to be tested in the group.
Specifically, the maximum self-discharge speed value of each group is divided by the average self-discharge speed value of the group, so that the multiplying power of all the battery cells to be tested in the group can be obtained, and the multiplying power can represent the difference between the maximum self-discharge degree of the group and the average self-discharge degree of the battery cells to be tested in the group.
S210, eliminating the abnormal battery cells according to the relative relation between the self-discharge speed value of the battery cells to be tested and the first preset value.
Specifically, as can be seen with continued reference to fig. 5, there are occasional abnormal cells (points circled by dotted lines in the figure) in the multiple groups of cells to be tested in the same batch, and these abnormal cells have microcircuit points due to the penetration of the diaphragm caused by the introduction of magnetic substances and metal particles in the manufacturing process or other reasons, and the self-discharge rate of such cells is far higher than the average value of the groups, which belongs to serious manufacturing defects and is unusable. If the abnormal cells are not excluded, the cells directly enter the screening of multiplying power and self-discharge speed, the self-discharge rate of the abnormal cells may be slightly lower than the screening value of the self-discharge speed, and the abnormal cells cannot be screened out, so that the cells to be tested with abnormal self-discharge speed need to be firstly excluded. The first preset value may be set by itself according to actual demands, and may be, for example, a value obtained by adding 4 times of standard deviation to a desired normal distribution map of the self-discharge speed data in each group.
S211, judging whether the multiplying power of the battery cell to be tested is larger than a second preset value, if so, entering the next step, otherwise, determining that the battery cell to be tested is a qualified battery cell.
Specifically, the second preset value is a screening standard value for screening the multiplying power of the battery cell to be tested, and can be set according to an empirical value or can be obtained according to big data analysis. If the multiplying power of the battery cell to be measured is larger than the second preset value, the battery cell to be measured indicates that the self-discharge degree of each battery cell to be measured in the group where the battery cell to be measured is located is unevenly distributed, and the battery cell to be measured may be a battery cell with the self-discharge rate exceeding the standard. If the multiplying power of the battery cells to be tested is smaller than the second preset value, the distribution of the self-discharge speed values of the battery cells to be tested is uniform, and the battery cells to be tested may be battery cells with the self-discharge rate exceeding the standard.
S212, judging whether the self-discharge speed value of the battery cell to be tested is larger than a third preset value, if so, determining that the battery cell to be tested is an unqualified battery cell, otherwise, determining that the battery cell to be tested is a qualified battery cell.
Specifically, the third preset value is a screening standard value for screening the self-discharge speed of the battery cell to be tested, and can be set according to an empirical value or can be obtained according to big data analysis. If the self-discharge speed of the battery cell to be tested is larger than the third preset value on the basis that the multiplying power is larger than the second preset value, the battery cell to be tested is not only in a group with discrete self-discharge rate distribution conditions, but also higher than a preset screening value, and the battery cell to be tested can be determined as a battery cell with unqualified self-discharge.
According to the lithium battery self-discharge screening method, firstly, abnormal cells in each group are removed by utilizing the relative relation between the self-discharge speed value and the first preset value, so that the micro-short-circuit cells caused by poor manufacturing are removed preferentially, the subsequent detection cost is saved, the screening standard of multiplying power is introduced, the whole group of normal cells with uniform self-discharge degree is prevented from being screened out mistakenly, accurate screening of the self-discharge degree of the lithium battery is realized, the mistaken screening rate is reduced, and the screening precision is further improved.
The embodiment of the invention also provides a lithium battery self-discharge screening device which is used for implementing any lithium battery self-discharge screening method. Fig. 6 is a schematic structural diagram of a lithium battery self-discharge screening device according to an embodiment of the present invention, and referring to fig. 6, a lithium battery self-discharge screening device 600 includes: the system comprises a grouping module 601, a self-discharge speed value acquisition module 602, a multiplying power determination module 603 and a screening module 604, wherein the grouping module 601 is used for grouping the battery cells to be tested, and the basic information of each group of battery cells to be tested is the same; the self-discharge speed value acquisition module 602 is configured to acquire a self-discharge speed value of a to-be-measured cell; the multiplying power determining module 603 is configured to determine multiplying power of the battery cells to be tested in the group according to the maximum self-discharge speed value and the average self-discharge speed value of each group of battery cells to be tested; the screening module 604 is configured to screen unqualified cells among the to-be-tested cells according to the multiplying power and the self-discharge speed value of each to-be-tested cell. According to the lithium battery self-discharge screening device 600, battery cells to be tested can be screened in groups, research objects screened each time are a group of batteries, basic information of the batteries can be guaranteed to be consistent due to the reduction of the range of the research objects, the self-discharge speed value and multiplying power of the battery cells to be tested in the group are further calculated, unqualified battery cells due to the self-discharge degree are screened according to the self-discharge speed value and multiplying power of the battery cells to be tested, the self-discharge screening of the lithium battery is achieved, the influence of environment and process variables can be eliminated to a greater extent through the group screening, the accuracy of the self-discharge screening technology is improved, and in addition, misjudgment caused by the environment and process variables can be further reduced due to the introduction of the screening standard of multiplying power, and the screening precision is improved.
The embodiment of the invention also provides electronic equipment. Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and referring to fig. 7, the electronic device includes: one or more processors 701, and a storage 702; the storage 702 is configured to store one or more programs that, when executed by the one or more processors 701, cause the one or more processors 701 to implement any of the lithium battery self-discharge screening methods described above.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the self-discharge screening method of any lithium battery is realized.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. The self-discharge screening method for the lithium battery is characterized by comprising the following steps of:
Grouping the battery cells to be tested, wherein the basic information of each group of battery cells to be tested is the same;
acquiring a self-discharge speed value of the battery cell to be tested;
Removing the abnormal battery cells according to the relative relation between the self-discharge speed value of the battery cells to be detected and a first preset value;
Determining the multiplying power of the battery cells to be tested in each group according to the maximum self-discharge speed value and the average self-discharge speed value of the battery cells to be tested, wherein the multiplying power specifically comprises the following steps: determining the maximum self-discharge speed value of each group of the battery cells to be tested; calculating the average self-discharge speed value of each group of the battery cells to be tested; calculating the ratio of the maximum self-discharge speed value to the corresponding average self-discharge speed value to obtain the multiplying power of all the battery cells to be tested in the group;
Screening unqualified battery cells in the battery cells to be tested according to the multiplying power and the self-discharge speed value of each battery cell to be tested, including: judging whether the multiplying power of the battery cell to be tested is larger than a second preset value, if so, entering the next step, otherwise, determining that the battery cell to be tested is a qualified battery cell; judging whether the self-discharge speed value of the battery cell to be tested is larger than a third preset value, if so, determining that the battery cell to be tested is an unqualified battery cell, otherwise, determining that the battery cell to be tested is a qualified battery cell.
2. The method for screening self-discharge of lithium battery according to claim 1, wherein obtaining the self-discharge speed value of the battery cell to be tested comprises:
carrying out capacity division on the battery cell to be tested to obtain the real capacity of the battery cell to be tested;
Adjusting the battery cell to be tested to a first charge state;
after the battery cell to be measured is kept stand for a first period of time at a first temperature, measuring first voltages at two ends of the battery cell to be measured;
after the battery cell to be measured is kept stand for a second time period at a first temperature, measuring second voltages at two ends of the battery cell to be measured;
and calculating the self-discharge speed value of the battery cell to be tested according to the second time period, the first voltage and the second voltage.
3. The lithium battery self-discharge screening method according to claim 1, wherein the basic information includes a battery material, a manufacturing lot number, and a test cabinet point.
4. The method according to claim 1, wherein the number of the battery cells to be tested in each group is any one of 10 to 30.
5. A lithium battery self-discharge screening device for implementing the lithium battery self-discharge screening method according to any one of claims 1 to 4, the lithium battery self-discharge screening device comprising:
The grouping module is used for grouping the battery cells to be tested, and the basic information of each group of battery cells to be tested is the same;
The self-discharge speed value acquisition module is used for acquiring the self-discharge speed value of the battery cell to be tested;
The multiplying power determining module is used for determining multiplying power of the battery cells to be tested in each group according to the maximum self-discharge speed value and the average self-discharge speed value of the battery cells to be tested, and specifically comprises the following steps: determining the maximum self-discharge speed value of each group of the battery cells to be tested; calculating the average self-discharge speed value of each group of the battery cells to be tested; calculating the ratio of the maximum self-discharge speed value to the corresponding average self-discharge speed value to obtain the multiplying power of all the battery cells to be tested in the group;
The screening module is used for eliminating abnormal cells according to the relative relation between the self-discharge speed value and a first preset value of the cells to be tested, and screening unqualified cells in the cells to be tested according to the multiplying power and the self-discharge speed value of each cell to be tested, and comprises the following steps: judging whether the multiplying power of the battery cell to be tested is larger than a second preset value, if so, entering the next step, otherwise, determining that the battery cell to be tested is a qualified battery cell; judging whether the self-discharge speed value of the battery cell to be tested is larger than a third preset value, if so, determining that the battery cell to be tested is an unqualified battery cell, otherwise, determining that the battery cell to be tested is a qualified battery cell.
6. An electronic device, the electronic device comprising:
one or more processors;
storage means for storing one or more programs,
When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the lithium battery self-discharge screening method of any one of claims 1-4.
7. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the lithium battery self-discharge screening method according to any one of claims 1-4.
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