CN111384459A - Method for judging blockage of negative pressure channel formed by electrical core formation - Google Patents
Method for judging blockage of negative pressure channel formed by electrical core formation Download PDFInfo
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- CN111384459A CN111384459A CN202010205558.9A CN202010205558A CN111384459A CN 111384459 A CN111384459 A CN 111384459A CN 202010205558 A CN202010205558 A CN 202010205558A CN 111384459 A CN111384459 A CN 111384459A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a method for judging blockage of a negative pressure channel formed by electrical core formation, which comprises the following steps: s1: drawing an SOC-OCV characteristic curve of the battery cell, carrying out constant-current charging on the battery cell, recording the voltage V1 of the charged battery cell, and calculating the charging capacity IC1 of the battery cell in the constant-current charging process, wherein IC1= I × t; s2: substituting the voltage V1 into the SOC-OCV characteristic curve of the battery cell to obtain the theoretical charging capacity IC2 of the battery cell, and dividing IC1 by IC2 to obtain the capacity ratio of the battery cell; s3: through steps S1 and S2, capacity ratios of all the battery cells are obtained, an average value X and a standard deviation σ of all the capacity ratios are calculated, and when the capacity ratio of a battery cell is smaller than (X +3 σ), it indicates that a formation negative pressure channel of the battery cell is blocked. The method is simple, quick and convenient to implement, and can effectively and accurately screen out the battery cell blocked by the negative pressure channel, thereby improving the production qualification rate of the battery cell and ensuring the qualification of the electrochemical performance of the battery cell.
Description
Technical Field
The invention relates to a method for judging blockage of a negative pressure channel formed by electrical core formation.
Background
At the initial stage of the formation of the battery core, a layer of SEI film can be formed on the surface of the negative electrode of the battery core, and a large amount of gas is generated along with the decomposition of water molecules and organic salt of electrolyte, so that negative pressure equipment can be used for performing negative pressure air extraction on the battery core in the charging process in the process of the formation of the battery core. If it blocks up to change into negative pressure passageway, the gas that produces in the electric core will can't be taken out, along with the increase of gas production, can be filled by gas between the electric core pole piece, makes the interval between the pole piece increase, leads to lithium ion at the increase of migration in-process polarization, and the charge capacity of electric core reduces, and then leads to electric core interface to have the lithium risk of analyzing, has influenced the electrochemical performance of electric core. And the formation equipment used in the prior art can not effectively detect whether the formation negative pressure channel is blocked, thus seriously affecting the normal production of the battery cell and the qualification rate of the battery cell production.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for judging the blockage of the formation negative pressure channel of the battery cell, which is simple, quick and very convenient to implement, can effectively and accurately screen out the battery cell blocked by the formation negative pressure channel, further can improve the production qualification rate of the battery cell and can ensure that the electrochemical performance of the battery cell is qualified.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for judging blockage of a negative pressure channel formed by electrical core formation comprises the following steps:
s1: drawing an SOC-OCV characteristic curve of the battery cell, carrying out constant-current charging on the battery cell, recording the voltage V1 of the charged battery cell, and calculating the charging capacity IC1 of the battery cell in the constant-current charging process, wherein IC1= I x t, I is the current of the constant-current charging, and t is the effective charging time of the constant-current charging;
s2: substituting the voltage V1 into the SOC-OCV characteristic curve of the battery cell to obtain the theoretical charging capacity IC2 of the battery cell, and dividing IC1 by IC2 to obtain the capacity ratio of the battery cell;
s3: through steps S1 and S2, capacity ratios of all the battery cells are obtained, an average value X and a standard deviation σ of all the capacity ratios are calculated, and when the capacity ratio of a battery cell is smaller than (X +3 σ), it indicates that a formation negative pressure channel of the battery cell is blocked.
Further providing a specific step of constant-current charging of the battery cell, in step S1, the specific step of constant-current charging of the battery cell is as follows:
s11: charging the battery cell to a specific voltage V2 in a constant-current manner, wherein the time taken in the process of charging to the specific voltage V2 is recorded as t 1;
s12: standing for 10-15 min;
s13: and then, charging the battery cell for a certain time t2 at a constant current, then recording the voltage V1 of the battery cell and calculating the charging capacity IC1 of the battery cell in the whole constant current charging process, wherein IC1= I (t 1+ t 2), and I is the current of constant current charging.
Further, step S11 is performed in an environment of vacuum degree of 30 to 60 KPa.
Further, step S13 is performed in an environment with a vacuum degree of 70 to 90 KPa.
Further, the specific voltage V2 is 3.65V.
Further, the time t2 is 10-20 min.
Further, the voltage V1 does not exceed 3.8V.
Further, in step S1, the specific step of drawing the SOC-OCV characteristic curve of the battery cell is as follows:
and charging the battery cell to a voltage V3 at a constant current, calculating the charging capacity of the battery cell in the process of charging to the voltage V3 and an SOC-OCV fitting equation of the battery cell, and drawing an SOC-OCV characteristic curve of the battery cell according to the SOC-OCV fitting equation.
Further, the voltage V3 is 4.3V.
After the technical scheme is adopted, firstly, an SOC-OCV characteristic curve of the battery cell is drawn according to the battery cell, the battery cell is subjected to constant current charging, after the charging is finished, the voltage V1 of the battery cell is recorded, the charging capacity IC1 of the battery cell in the constant current charging process is calculated, IC1= I x t, wherein I is the current of the constant current charging, and t is the effective charging time of the constant current charging. And then substituting the voltage V1 into the SOC-OCV characteristic curve of the battery cell to obtain the theoretical charging capacity IC2 of the battery cell, and dividing IC1 by IC2 to obtain the capacity ratio of the battery cell. And then calculating the capacity ratios of all the battery cells by the method, and then calculating the average value X and the standard deviation sigma of all the capacity ratios, wherein when the capacity ratio of the battery cell is smaller than (X +3 sigma), the formation negative pressure channel of the battery cell is indicated to be blocked. If it becomes negative pressure passageway and does not block up, IC1 is almost equal with IC2, and the capacity ratio equals about 1, if it becomes negative pressure passageway and blocks up, the gas that produces in the electric core will can't be taken out, along with the increase of gas production, can be filled by gas between the electric core pole piece, makes the interval between the pole piece increase, leads to lithium ion at the increase of polarization of migration in-process, and the charge capacity IC1 of electric core can reduce for the capacity ratio reduces. The method is simple, quick and convenient to implement, and can effectively and accurately screen out the battery cell blocked by the formation negative pressure channel so as to accurately remove the battery cell blocked by the formation negative pressure channel, and the remaining battery cell which is not removed is the qualified battery cell, thereby improving the production qualification rate of the battery cell and ensuring the electrochemical performance of the battery cell.
Drawings
FIG. 1 is a SOC-OCV characteristic curve of a cell;
fig. 2 is a correlation curve of charging voltage and gas production rate in the cell formation process.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1 and 2, fig. 1 is a SOC-OCV characteristic curve of a battery cell, and fig. 2 is a correlation curve of a charging voltage and a gas production rate in a battery formation process.
A method for judging blockage of a negative pressure channel formed by electrical core formation comprises the following steps:
s1: drawing an SOC-OCV characteristic curve of the battery cell, carrying out constant-current charging on the battery cell, recording the voltage V1 of the charged battery cell, and calculating the charging capacity IC1 of the battery cell in the constant-current charging process; specifically, IC1= I × t, where I is a current for constant current charging, and t is an effective charging time for constant current charging;
s2: substituting the voltage V1 into the SOC-OCV characteristic curve of the battery cell to obtain the theoretical charging capacity IC2 of the battery cell, and dividing IC1 by IC2 to obtain the capacity ratio of the battery cell;
s3: obtaining the capacity ratios of all the battery cells through steps S1 and S2, calculating the average value X and the standard deviation sigma of all the capacity ratios, and according to the 3 sigma principle in statistical normal distribution, when the capacity ratio of a battery cell is smaller than (X +3 sigma), indicating that a formation negative pressure channel of the battery cell is blocked; specifically, the calculation formula of the standard deviation σ is common knowledge, and is not described in detail in this embodiment. By the method, the battery cells which are blocked by the negative pressure channel can be effectively and accurately screened from a batch of battery cells, so that the battery cells which are blocked by the negative pressure channel can be accurately removed, the remaining battery cells which are not removed are qualified battery cells, the production qualification rate of the battery cells is improved, and the electrochemical performance of the battery cells is ensured.
Specifically, in step S1, the specific step of charging the battery cell with a constant current may be:
s11: charging the battery cell to a specific voltage V2 in a constant-current manner, wherein the time taken in the process of charging to the specific voltage V2 is recorded as t 1;
s12: standing for 10-15 min;
s13: then, the battery cell is subjected to constant current charging for a certain time t2, then the voltage V1 of the battery cell is recorded, and the charging capacity IC1 of the battery cell in the whole constant current charging process is calculated, wherein IC1= I (t 1+ t 2), and I is the current of constant current charging; specifically, t = t1+ t2, and thus IC1= I (t 2+ t 1); more specifically, the current for constant current charging in step S11 and step S12 is I; in this embodiment, the standing time in step S12 may be 10 min.
Specifically, the step S11 may be performed in an environment with a vacuum degree of 30 to 60KPa, and the step S13 may be performed in an environment with a vacuum degree of 70 to 90 KPa; in the present embodiment, the step S11 is performed in an environment with a vacuum degree of 45KPa, the step S13 is performed in an environment with a vacuum degree of 80KPa, the specific voltage V2 is 3.65V, the time t2 is 10-20 min, preferably 10min, and the voltage V1 should not exceed 3.8V.
Specifically, in step S1, the specific step of drawing the SOC-OCV characteristic curve of the battery cell may be:
charging the battery cell to a voltage V3 at a constant current, calculating the charging capacity of the battery cell in the process of charging to the voltage V3 and an SOC-OCV fitting equation of the battery cell, and drawing an SOC-OCV characteristic curve of the battery cell according to the SOC-OCV fitting equation; wherein the voltage V3 may be 4.3V.
The working principle of the invention is as follows:
firstly, drawing an SOC-OCV characteristic curve of a battery cell according to the battery cell, carrying out constant current charging on the battery cell, recording the voltage V1 of the battery cell after the charging is finished, and calculating the charging capacity IC1 of the battery cell in the constant current charging process, wherein IC1= I x t, I is the current of the constant current charging, and t is the effective charging time of the constant current charging. And then substituting the voltage V1 into the SOC-OCV characteristic curve of the battery cell to obtain the theoretical charging capacity IC2 of the battery cell, and dividing IC1 by IC2 to obtain the capacity ratio of the battery cell. And then calculating the capacity ratios of all the battery cells by the method, and then calculating the average value X and the standard deviation sigma of all the capacity ratios, wherein when the capacity ratio of the battery cell is smaller than (X +3 sigma), the formation negative pressure channel of the battery cell is indicated to be blocked. If it becomes negative pressure passageway and does not block up, IC1 is almost equal with IC2, and the capacity ratio equals about 1, if it becomes negative pressure passageway and blocks up, the gas that produces in the electric core will can't be taken out, along with the increase of gas production, can be filled by gas between the electric core pole piece, makes the interval between the pole piece increase, leads to lithium ion at the increase of polarization of migration in-process, and the charge capacity IC1 of electric core can reduce for the capacity ratio reduces. The method is simple, quick and convenient to implement, and can effectively and accurately screen out the battery cell blocked by the formation negative pressure channel so as to accurately remove the battery cell blocked by the formation negative pressure channel, and the remaining battery cell which is not removed is the qualified battery cell, thereby improving the production qualification rate of the battery cell and ensuring the electrochemical performance of the battery cell.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for judging blockage of a negative pressure channel formed by electrical core formation is characterized by comprising the following steps:
s1: drawing an SOC-OCV characteristic curve of the battery cell, carrying out constant-current charging on the battery cell, recording the voltage V1 of the charged battery cell, and calculating the charging capacity IC1 of the battery cell in the constant-current charging process, wherein IC1= I x t, I is the current of the constant-current charging, and t is the effective charging time of the constant-current charging;
s2: substituting the voltage V1 into the SOC-OCV characteristic curve of the battery cell to obtain the theoretical charging capacity IC2 of the battery cell, and dividing IC1 by IC2 to obtain the capacity ratio of the battery cell;
s3: through steps S1 and S2, capacity ratios of all the battery cells are obtained, an average value X and a standard deviation σ of all the capacity ratios are calculated, and when the capacity ratio of a battery cell is smaller than (X +3 σ), it indicates that a formation negative pressure channel of the battery cell is blocked.
2. The method for determining the blockage of the electrical cellization negative pressure channel according to claim 1, wherein in step S1, the specific steps of the constant-current charging of the electrical cell are as follows:
s11: charging the battery cell to a specific voltage V2 in a constant-current manner, wherein the time taken in the process of charging to the specific voltage V2 is recorded as t 1;
s12: standing for 10-15 min;
s13: and then, charging the battery cell for a certain time t2 at a constant current, then recording the voltage V1 of the battery cell and calculating the charging capacity IC1 of the battery cell in the whole constant current charging process, wherein IC1= I (t 1+ t 2), and I is the current of constant current charging.
3. The method for determining the clogging of the electrical core formation negative pressure channel according to claim 2, wherein the step S11 is performed in an environment with a vacuum degree of 30 to 60 KPa.
4. The method for determining the clogging of the electrical core formation negative pressure channel according to claim 2, wherein the step S13 is performed in an environment with a vacuum degree of 70 to 90 KPa.
5. The method for determining whether a negative pressure channel is blocked by electrical coring according to claim 2, wherein the specific voltage V2 is 3.65V.
6. The method for determining the blockage of the electrical core formation negative pressure channel according to claim 2, wherein the time t2 is 10-20 min.
7. The method for determining the clogging of the electrical cellularization negative pressure channel according to claim 1 or 2, wherein the voltage V1 is not more than 3.8V.
8. The method for determining that a negative pressure passage formed by cell formation is blocked according to claim 1, wherein in step S1, the specific steps of drawing the SOC-OCV characteristic curve of the cell are as follows:
and charging the battery cell to a voltage V3 at a constant current, calculating the charging capacity of the battery cell in the process of charging to the voltage V3 and an SOC-OCV fitting equation of the battery cell, and drawing an SOC-OCV characteristic curve of the battery cell according to the SOC-OCV fitting equation.
9. The method for determining the blockage of the electrical chemical negative pressure channel according to claim 8, wherein the voltage V3 is 4.3V.
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Cited By (1)
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| CN113791352A (en) * | 2021-09-17 | 2021-12-14 | 深圳市新威尔电子有限公司 | Battery testing method based on capacity dispersion |
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