CN110649324A - Lithium battery formation and capacity grading process - Google Patents
Lithium battery formation and capacity grading process Download PDFInfo
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- CN110649324A CN110649324A CN201910914658.6A CN201910914658A CN110649324A CN 110649324 A CN110649324 A CN 110649324A CN 201910914658 A CN201910914658 A CN 201910914658A CN 110649324 A CN110649324 A CN 110649324A
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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
- H01M10/058—Construction or manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a lithium battery formation and capacity grading process in the technical field of lithium batteries, wherein a battery cell subjected to film sleeving is charged at a constant current of 0.05 ℃ for 15min and at a constant current of 0.1 ℃ for 10min, is subjected to ocv sorting after standing for 24h, is at a first level of 50mV, is placed in a battery bracket, and is connected in series after being connected in parallel to form a battery module. After m battery modules are connected in series, 3600S is charged at a constant current of 0.1C; 0.2C constant current charging 7200S; the constant current and the constant voltage of 0.3C are charged to 3.65V of the monomer, and the cutoff current is 0.05C. The invention has the advantages that the lithium battery is manufactured, the production cost of the lithium battery is reduced, the formed module can be directly used for producing the battery pack, the battery can be divided into different grades, the grading process is saved, the battery performance of the same grade is close, the service life of the battery pack is longer, the performance is more stable, the detection period is short, the method is simple and easy to realize, the production operation is convenient, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery formation and capacity grading process.
Background
With the development of the lithium battery industry, the competitive industry is more and more intense, and the profit of the industry is lower and lower. All companies seek methods, and on the premise of ensuring the quality of the lithium battery, the production time of the battery is shortened, the production process of the battery is simplified, and the production cost of the battery is reduced. The general lithium battery capacity screening process in the current market is as follows: after the battery is formed, capacity grading is needed, wherein the capacity grading is to charge and discharge the formed battery in a detection cabinet and grade the battery in a lower cabinet according to discharge capacity; and then aging is carried out, and the products are delivered according to the aged battery state. Wherein the partial volume process needs the manual work to go up the cupboard from top to bottom, and it is longer to go up the measurement cabinet charge-discharge time, consequently causes that the cost of labor is high, production cycle length, and stock battery is overstocked to the required investment fund volume of partial volume equipment is big, causes manufacturing cost's increase, and the testing process power consumption is huge, is unfavorable for energy-conservation. The lithium battery is used in a multi-string and multi-parallel combination mode or is used independently in a single lithium battery in actual use, and aiming at the requirement of multi-string and multi-parallel combination in the market, the invention judges whether the capacity of the battery core is qualified or not by improving the existing formation process and optimizing the aged battery core voltage screening method, finally the existing capacity grading process is omitted, the purposes of shortening the production flow of the lithium battery, improving the production efficiency of the lithium battery and reducing the production cost of the lithium battery are achieved, and the formed battery module can be directly used for producing a battery pack.
Disclosure of Invention
The invention aims to provide a lithium battery formation and capacity grading process to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a lithium battery formation and capacity grading process comprises the following steps:
(1) charging multiple groups of battery cores subjected to film covering for 15min at a constant current of 0.05C and 10min at a constant current of 0.1C;
(2) standing the battery cell in the step (1) for 24 hours, and then performing ocv sorting, wherein 50mV is the first grade;
(3) arranging the battery cores in the same gear in a battery bracket, and connecting nickel sheets in parallel and then in series to form a battery module;
(4) carrying out formation work after connecting the plurality of groups of battery modules in the step (3) in series;
formation:
(5) and (3) carrying out formation on the battery cell in the step (4) through a high-temperature pressure formation device, wherein the temperature of a hot clamp is 45-70 ℃, the pressure of the hot clamp is 400-2000kg, the pressure of a cold clamp is 400-2000kg, the temperature of the cold clamp is ensured to be 15-30 ℃, the cold pressing time is 180-300S, the battery cell in the step (4) is placed into the high-temperature pressure formation device, the high-temperature pressure formation device is placed for 100-220S after reaching the conditions, and then the first-step current constant-current charging is carried out: the battery cell is charged with a constant current of 0.1C for 3600S; and second step, current constant current charging: the battery cell is charged at a constant current of 0.2C for 7200S; and step three, constant current charging: the battery cell is charged to a monomer of 3.65V at a constant current of 0.3C, the cut-off voltage is 3.65V, the cut-off current is 0.05C, and the battery cell is kept still for 3600S;
(6) detecting whether the single string of the module has a differential pressure less than or equal to 50mV as qualified, and continuously forming unqualified reworks;
(7) standing the qualified product obtained in the step (6) for 5min, charging the product to 3.65V at a constant current and a constant voltage of 0.3C, and stopping the charging when the current reaches 0.05C; standing for 5min, discharging at constant current of 0.3C to 2.0V, and recording the capacity as C1; standing for 5min, charging to 3.65V at constant current and constant voltage of 0.3C, and stopping when the current reaches 0.05C;
and (3) aging:
(8) placing the battery cell in the step (7) at the temperature of 20-30 ℃ for normal-temperature aging for 48-168 h;
(9) monitoring the open-circuit voltage of the module of the aged battery cell by using a voltage and internal resistance tester, wherein the single-string voltage difference is less than or equal to 50mV and is qualified;
(10) testing the capacity retention rate of the battery core qualified by aging in the step (9), recording the discharge capacity as C2, calculating the ratio K of C2/C1, selecting the battery with larger self-discharge through the K value and grading the rest batteries, wherein the battery with the K less than or equal to R is the battery with large self-discharge, namely the unqualified battery, and the battery with the K between R and 100 is divided into N grades according to the K value;
(11) and (5) discharging the batteries after grading according to the gears.
Further, the battery support in the step (3) is a plastic support.
Further, the qualified module formed in the step (6) can be directly used for producing the battery pack.
Further, R in the (10) is 85-95%, and N is more than or equal to 2
Compared with the prior art, the invention has the beneficial effects that: the invention has the advantages that the lithium battery is manufactured, the production cost of the lithium battery is reduced, the formed module can be directly used for producing the battery pack, the battery can be divided into different grades, the grading process is saved, the battery performance of the same grade is close, the service life of the battery pack is longer, the performance is more stable, the detection period is short, the method is simple and easy to realize, the production operation is convenient, and the production efficiency is improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A lithium battery formation and capacity grading process comprises the following steps:
(1) charging multiple groups of battery cores subjected to film covering for 15min at a constant current of 0.05C and 10min at a constant current of 0.1C;
(2) standing the battery cell in the step (1) for 24 hours, and then performing ocv sorting, wherein 50mV is the first grade;
(3) arranging the battery cores in the same gear in a battery bracket, and connecting nickel sheets in parallel and then in series to form a battery module;
(4) carrying out formation work after connecting the plurality of groups of battery modules in the step (3) in series;
formation:
(5) forming the battery cell in the step (4) through a high-temperature pressure forming device, wherein the temperature of a hot clamp is 45 during formation, the pressure of the hot clamp is 400kg, the pressure of a cold clamp is 400kg, the temperature of the cold clamp is 15 ℃, the cold pressing time is 180S, the battery cell in the step (4) is placed in the high-temperature pressure forming device, the high-temperature pressure forming device is placed for 100S after reaching the above conditions, and then, the first-step current constant-current charging is carried out: the battery cell is charged with a constant current of 0.1C for 3600S; and second step, current constant current charging: the battery cell is charged at a constant current of 0.2C for 7200S; and step three, constant current charging: the battery cell is charged to a monomer of 3.65V at a constant current of 0.3C, the cut-off voltage is 3.65V, the cut-off current is 0.05C, and the battery cell is kept still for 3600S;
(6) detecting whether the single string of the module has a differential pressure less than or equal to 50mV as qualified, and continuously forming unqualified reworks;
(7) standing the qualified product obtained in the step (6) for 5min, charging the product to 3.65V at a constant current and a constant voltage of 0.3C, and stopping the charging when the current reaches 0.05C; standing for 5min, discharging at constant current of 0.3C to 2.0V, and recording the capacity as C1; standing for 5min, charging to 3.65V at constant current and constant voltage of 0.3C, and stopping when the current reaches 0.05C;
and (3) aging:
(8) placing the battery cell in the step (7) at a temperature of 20 ℃ for normal-temperature aging for 48 hours;
(9) monitoring the open-circuit voltage of the module of the aged battery cell by using a voltage and internal resistance tester, wherein the single-string voltage difference is less than or equal to 50mV and is qualified;
(10) testing the capacity retention rate of the battery core qualified by aging in the step (9), recording the discharge capacity as C2, calculating the ratio K of C2/C1, selecting the battery with larger self-discharge through the K value and grading the rest batteries, wherein the battery with the K less than or equal to R is the battery with large self-discharge, namely the unqualified battery, and the battery with the K between R and 100 is divided into N grades according to the K value;
(11) and (5) discharging the batteries after grading according to the gears.
Comprises (3) the middle battery bracket is a plastic bracket; (6) the module qualified by neutralization can be directly used for producing the battery pack; (10) wherein R is 85 percent, and N is more than or equal to 2.
Example 2
A lithium battery formation and capacity grading process comprises the following steps:
(1) charging multiple groups of battery cores subjected to film covering for 15min at a constant current of 0.05C and 10min at a constant current of 0.1C;
(2) standing the battery cell in the step (1) for 24 hours, and then performing ocv sorting, wherein 50mV is the first grade;
(3) arranging the battery cores in the same gear in a battery bracket, and connecting nickel sheets in parallel and then in series to form a battery module;
(4) carrying out formation work after connecting the plurality of groups of battery modules in the step (3) in series;
formation:
(5) forming the battery cell in the step (4) through a high-temperature pressure forming device, wherein the temperature of a hot clamp is 50 ℃, the pressure of the hot clamp is 9000kg, the pressure of a cold clamp is 900kg, the temperature of the cold clamp is 20 ℃, the cold pressing time is 240S, placing the battery cell in the step (4) into the high-temperature pressure forming device, placing the battery cell in the step (4) for 150S after the high-temperature pressure forming device reaches the above conditions, and then carrying out first-step current constant-current charging: the battery cell is charged with a constant current of 0.1C for 3600S; and second step, current constant current charging: the battery cell is charged at a constant current of 0.2C for 7200S; and step three, constant current charging: the battery cell is charged to a monomer of 3.65V at a constant current of 0.3C, the cut-off voltage is 3.65V, the cut-off current is 0.05C, and the battery cell is kept still for 3600S;
(6) detecting whether the single string of the module has a differential pressure less than or equal to 50mV as qualified, and continuously forming unqualified reworks;
(7) standing the qualified product obtained in the step (6) for 5min, charging the product to 3.65V at a constant current and a constant voltage of 0.3C, and stopping the charging when the current reaches 0.05C; standing for 5min, discharging at constant current of 0.3C to 2.0V, and recording the capacity as C1; standing for 5min, charging to 3.65V at constant current and constant voltage of 0.3C, and stopping when the current reaches 0.05C;
and (3) aging:
(8) placing the battery cell in the step (7) at a temperature of 25 ℃ for normal-temperature aging, wherein the aging time is 120 h;
(9) monitoring the open-circuit voltage of the module of the aged battery cell by using a voltage and internal resistance tester, wherein the single-string voltage difference is less than or equal to 50mV and is qualified;
(10) testing the capacity retention rate of the battery core qualified by aging in the step (9), recording the discharge capacity as C2, calculating the ratio K of C2/C1, selecting the battery with larger self-discharge through the K value and grading the rest batteries, wherein the battery with the K less than or equal to R is the battery with large self-discharge, namely the unqualified battery, and the battery with the K between R and 100 is divided into N grades according to the K value;
(11) and (5) discharging the batteries after grading according to the gears.
Comprises (3) the middle battery bracket is a plastic bracket; (6) the module qualified by neutralization can be directly used for producing the battery pack; (10) wherein R is 87% and N is more than or equal to 2.
Example 3
A lithium battery formation and capacity grading process comprises the following steps:
(1) charging multiple groups of battery cores subjected to film covering for 15min at a constant current of 0.05C and 10min at a constant current of 0.1C;
(2) standing the battery cell in the step (1) for 24 hours, and then performing ocv sorting, wherein 50mV is the first grade;
(3) arranging the battery cores in the same gear in a battery bracket, and connecting nickel sheets in parallel and then in series to form a battery module;
(4) carrying out formation work after connecting the plurality of groups of battery modules in the step (3) in series;
formation:
(5) forming the battery cell in the step (4) through a high-temperature pressure forming device, wherein the temperature of a hot clamp is 70 ℃, the pressure of the hot clamp is 2000kg, the pressure of a cold clamp is 2000kg during forming, the temperature of the cold clamp is 30 ℃, the cold pressing time is 300S, the battery cell in the step (4) is placed in the high-temperature pressure forming device, the high-temperature pressure forming device is placed for 220S after reaching the above conditions, and then, the first-step current constant-current charging is carried out: the battery cell is charged with a constant current of 0.1C for 3600S; and second step, current constant current charging: the battery cell is charged at a constant current of 0.2C for 7200S; and step three, constant current charging: the battery cell is charged to a monomer of 3.65V at a constant current of 0.3C, the cut-off voltage is 3.65V, the cut-off current is 0.05C, and the battery cell is kept still for 3600S;
(6) detecting whether the single string of the module has a differential pressure less than or equal to 50mV as qualified, and continuously forming unqualified reworks;
(7) standing the qualified product obtained in the step (6) for 5min, charging the product to 3.65V at a constant current and a constant voltage of 0.3C, and stopping the charging when the current reaches 0.05C; standing for 5min, discharging at constant current of 0.3C to 2.0V, and recording the capacity as C1; standing for 5min, charging to 3.65V at constant current and constant voltage of 0.3C, and stopping when the current reaches 0.05C;
and (3) aging:
(8) placing the battery cell in the step (7) at a temperature of 30 ℃ for normal-temperature aging for 168 h;
(9) monitoring the open-circuit voltage of the module of the aged battery cell by using a voltage and internal resistance tester, wherein the single-string voltage difference is less than or equal to 50mV and is qualified;
(10) testing the capacity retention rate of the battery core qualified by aging in the step (9), recording the discharge capacity as C2, calculating the ratio K of C2/C1, selecting the battery with larger self-discharge through the K value and grading the rest batteries, wherein the battery with the K less than or equal to R is the battery with large self-discharge, namely the unqualified battery, and the battery with the K between R and 100 is divided into N grades according to the K value;
(11) and (5) discharging the batteries after grading according to the gears.
Comprises (3) the middle battery bracket is a plastic bracket; (6) the module qualified by neutralization can be directly used for producing the battery pack; (10) wherein R is 95 percent and N is more than or equal to 2.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A lithium battery formation and capacity grading process is characterized in that: the method comprises the following steps:
(1) charging multiple groups of battery cores subjected to film covering for 15min at a constant current of 0.05C and 10min at a constant current of 0.1C;
(2) standing the battery cell in the step (1) for 24 hours, and then performing ocv sorting, wherein 50mV is the first grade;
(3) arranging the battery cores in the same gear in a battery bracket, and connecting nickel sheets in parallel and then in series to form a battery module;
(4) carrying out formation work after connecting the plurality of groups of battery modules in the step (3) in series;
formation:
and (3) carrying out formation on the battery cell in the step (4) through a high-temperature pressure formation device, wherein the temperature of a hot clamp is 45-70 ℃, the pressure of the hot clamp is 400-2000kg, the pressure of a cold clamp is 400-2000kg, the temperature of the cold clamp is ensured to be 15-30 ℃, the cold pressing time is 180-300S, the battery cell in the step (4) is placed into the high-temperature pressure formation device, the high-temperature pressure formation device is placed for 100-220S after reaching the conditions, and then the first-step current constant-current charging is carried out: the battery cell is charged with a constant current of 0.1C for 3600S; and second step, current constant current charging: the battery cell is charged at a constant current of 0.2C for 7200S; and step three, constant current charging: the battery cell is charged to a monomer of 3.65V at a constant current of 0.3C, the cut-off voltage is 3.65V, the cut-off current is 0.05C, and the battery cell is kept still for 3600S;
(6) detecting whether the single string of the module has a differential pressure less than or equal to 50mV as qualified, and continuously forming unqualified reworks;
(7) standing the qualified product obtained in the step (6) for 5min, charging the product to 3.65V at a constant current and a constant voltage of 0.3C, and stopping the charging when the current reaches 0.05C; standing for 5min, discharging at constant current of 0.3C to 2.0V, and recording the capacity as C1; standing for 5min, charging to 3.65V at constant current and constant voltage of 0.3C, and stopping when the current reaches 0.05C;
and (3) aging:
(8) placing the battery cell in the step (7) at the temperature of 20-30 ℃ for normal-temperature aging for 48-168 h;
(9) monitoring the open-circuit voltage of the module of the aged battery cell by using a voltage and internal resistance tester, wherein the single-string voltage difference is less than or equal to 50mV and is qualified;
(10) testing the capacity retention rate of the battery core qualified by aging in the step (9), recording the discharge capacity as C2, calculating the ratio K of C2/C1, selecting the battery with larger self-discharge through the K value and grading the rest batteries, wherein the battery with the K less than or equal to R is the battery with large self-discharge, namely the unqualified battery, and the battery with the K between R and 100 is divided into N grades according to the K value;
(11) and (5) discharging the batteries after grading according to the gears.
2. The lithium battery formation and capacity grading process of claim 1, wherein: and the battery bracket in the step (3) is a plastic bracket.
3. The lithium battery formation and capacity grading process of claim 1, wherein: and (6) the qualified module formed in the step (6) can be directly used for producing the battery pack.
4. The lithium battery formation and capacity grading process of claim 1, wherein: r in the (10) is 85-95%, and N is more than or equal to 2.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582680A (en) * | 2020-11-30 | 2021-03-30 | 宁波维科电池有限公司 | Method for forming lithium ion battery into component capacity |
| CN112952226A (en) * | 2021-01-26 | 2021-06-11 | 福建南平延平区南孚新能源科技有限公司 | Formation method of high-voltage lithium ion battery and high-voltage lithium ion battery |
| CN112993423A (en) * | 2021-02-19 | 2021-06-18 | 芜湖天弋能源科技有限公司 | Method for improving capacity of lithium ion battery cell module |
| CN113889682A (en) * | 2021-10-09 | 2022-01-04 | 唐山航天万源科技有限公司 | Aging selection method for lithium battery |
| CN114082680A (en) * | 2021-11-22 | 2022-02-25 | 芜湖天弋能源科技有限公司 | Method for optimizing cycle performance of lithium battery module |
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- 2019-09-26 CN CN201910914658.6A patent/CN110649324A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582680A (en) * | 2020-11-30 | 2021-03-30 | 宁波维科电池有限公司 | Method for forming lithium ion battery into component capacity |
| CN112952226A (en) * | 2021-01-26 | 2021-06-11 | 福建南平延平区南孚新能源科技有限公司 | Formation method of high-voltage lithium ion battery and high-voltage lithium ion battery |
| CN112993423A (en) * | 2021-02-19 | 2021-06-18 | 芜湖天弋能源科技有限公司 | Method for improving capacity of lithium ion battery cell module |
| CN113889682A (en) * | 2021-10-09 | 2022-01-04 | 唐山航天万源科技有限公司 | Aging selection method for lithium battery |
| CN114082680A (en) * | 2021-11-22 | 2022-02-25 | 芜湖天弋能源科技有限公司 | Method for optimizing cycle performance of lithium battery module |
| CN114082680B (en) * | 2021-11-22 | 2023-06-02 | 芜湖天弋能源科技有限公司 | Method for optimizing cycle performance of lithium battery module |
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