CN108172918A - A kind of quick forming and capacity dividing method of lithium battery - Google Patents
A kind of quick forming and capacity dividing method of lithium battery Download PDFInfo
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- CN108172918A CN108172918A CN201711313541.XA CN201711313541A CN108172918A CN 108172918 A CN108172918 A CN 108172918A CN 201711313541 A CN201711313541 A CN 201711313541A CN 108172918 A CN108172918 A CN 108172918A
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- lithium battery
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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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- 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
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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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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
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Abstract
The invention discloses a kind of quick forming and capacity dividing method of lithium battery, comprising chemical conversion, aging, self discharge screening, partial volume, primary dcreening operation, stepping, when the lithium battery for meeting following standard simultaneously is then qualified lithium battery：a：Formation charging time t=T of lithium battery ±（3~6）σ；b：（88‑92%）*C1+C3=（100~110%）* nominal capacity, and C2=（95%~105%）*C3；c：Cell voltage changes delta V=V1 V2 are less than ＜ 5mV.Conventional self discharge screening is reasonably advanced to before partial volume by the present invention, abnormal battery can effectively be avoided to circulate to partial volume work step, cause security risk, and the method can adequately utilize ageing time after chemical conversion early period, greatly shorten the self discharge screening period of battery, the quantity filled an electric circulation step, reduce partial volume equipment of forming and capacity dividing is reduced, so as to reduce the equipment cost and later stage working service cost of lithium battery production.
Description
Technical field
The present invention relates to technical field of lithium ion more particularly to a kind of quick forming and capacity dividing methods of lithium battery.
Background technology
In Production Process of Lithium Battery, need to activate battery core, category filter then is carried out to the lithium battery after chemical conversion, is separated
Battery core grade.Forming and capacity dividing is carried out to lithium battery.Since the step flow of forming and capacity dividing is complicated, the period is long, and occupies a large amount of
Equipment and space, cycle charge discharge electric energy consumption is huge, even if using energy regenerating, also has a large amount of energy waste, causes battery
Cost increases.
The method of screening self discharge at present by the way of voltage drop, i.e., stands a period of time at a certain temperature mostly,
The battery of self discharge is screened using front and rear voltage drop；And due to battery polarization etc., mostly after partial volume, warp
Accurate voltage change can be just obtained after crossing prolonged stand, causes the battery production period long；And in battery partial volume
It is screened before without self discharge, the battery circulation note partial volume work step of self discharge has some potential safety problems.
Invention content
Technical problems based on background technology, the purpose of the present invention is to propose to a kind of quick forming and capacity dividings of lithium battery
Method.
A kind of quick forming and capacity dividing method of lithium battery, comprises the steps of：
1. it is melted into：Lithium battery after injection electrolyte is melted into after standing, and lithium battery charging is recorded in formation process
To formation charging the time t and charging capacity C1 needed for 3.6~3.7V of blanking voltage, the voltage V1 of lithium battery is then detected；
2. aging：After lithium battery after chemical conversion is stood again, its voltage V2 is detected；
3. self discharge is screened：The lithium battery of self discharge qualification, i.e. voltage difference Δ V ＜ are filtered out using pressure difference test
5mV；
4. partial volume：Operation is charged and discharged to lithium battery, records charging capacity C2 and discharge capacity C3；
5. primary dcreening operation：Respectively to through step, 3. treated that all lithium batteries carry out the detection of weight and internal resistance, and select weight
The lithium battery of amount and internal resistance qualification is just qualified lithium battery；
6. stepping：The average value t and standard deviation sigma of the formation charging time t2 of all just qualified lithium batteries is calculated, when same
When to meet the lithium battery of following standard be then qualified lithium battery：
a：Formation charging time t=T ± (3~6) σ of lithium battery；
b：(88~92%) * C1+C3=(100~110%) * nominal capacitys, and C2=(95%~105%) * C3；
c：Cell voltage changes delta V=V1-V2 is less than ＜ 5mV.
Preferably, the step temperature that 1. middle lithium battery is stood be 40~50 DEG C, the time be 12~for 24 hours；Charging current is
0.05~0.1C；The voltage V1 for detecting lithium battery is that 0.5~1h is detected after formation charging.
Preferably, the step temperature that 2. middle lithium battery is stood is 40~50 DEG C, the time is 24~36h.
Preferably, 4. the middle electric current for being charged and discharged operation is 0.5~0.7C to step, and charge cutoff voltage 4.2V is put
Electric blanking voltage is 3.6~3.7V.
Before conventional self discharge screening is reasonably advanced to partial volume by the present invention, abnormal battery can effectively be avoided to circulate
To partial volume work step, security risk is caused；And the method can directly borrow chemical conversion adequately using chemical conversion early period and ageing time
The voltage and aging surveyed afterwards measure the foundation that voltage is screened as self-discharge of battery, highly shortened the self discharge screening of battery
Period.
The present invention makes full use of chemical conversion and the charging of each work step of partial volume, discharge capacity, can effectively reduce forming and capacity dividing
An electric circulation step is filled, reduces the quantity of partial volume equipment, so as to reduce the equipment cost and later stage working service of lithium battery production
Cost.
Specific embodiment
Embodiments of the present invention are illustrated by specific embodiment below, those skilled in the art can be taken off by the present invention
The content of dew easily understands other advantages of the present invention.
Embodiment 1：
A kind of quick forming and capacity dividing method of lithium battery, comprises the steps of：
1. it is melted into：Injection electrolyte after lithium battery temperature for 40~50 DEG C stand 12~be melted into afterwards for 24 hours, be melted into
Record lithium battery is using electric current as the formation charging time t needed for 0.05~0.1C charges to 3.6~3.7V of blanking voltage in the process
With charging capacity C1, then after formation charging 0.5~1h detect lithium battery voltage V1；
2. aging：Lithium battery after chemical conversion is detected into its voltage V2 after 40~50 DEG C stand 24~36h again；
3. partial volume：Operation is charged and discharged to lithium battery, records charging capacity C2 and discharge capacity C3；Wherein charge
Electric current with discharge operation is 0.5~0.7C, and charge cutoff voltage 4.2V, discharge cut-off voltage is 3.6~3.7V.
4. primary dcreening operation：Respectively to through step, 3. treated that all lithium batteries carry out the detection of weight and internal resistance, and select weight
The lithium battery of amount and internal resistance qualification is just qualified lithium battery；
5. stepping：The average value t and standard deviation sigma of the formation charging time t2 of all just qualified lithium batteries is calculated, when same
When to meet the lithium battery of following standard be then qualified lithium battery：
a：Formation charging time t=T ± (3~6) σ of lithium battery；
b：(88~92%) * C1+C3=(100~110%) * nominal capacitys, and C2=(95%~105%) * C3；
c：Cell voltage changes delta V=V1-V2 is less than ＜ 5mV.
Embodiment 2：
Illustrate by taking the ternary material lithium battery of 50 models manufactured 2714891 as an example below, nominal capacity
For 48Ah, internal resistance is 0.5~1m Ω, and weight is 860 ± 5g, and Δ V ＜ 5mV are spec battery after time of repose for 24 hours.
Lithium battery is stood for 24 hours at 45 DEG C after 50 fluid injections, is melted into 4.8A electric currents, and blanking voltage 3.7V, record fills
Electricity is to t2 and charging capacity C1 the time required to 3.7V, and 30min detects its voltage V1 again after formation charging；By battery at 45 DEG C
Lower standing detects voltage V2 afterwards for 24 hours；Then it after completing the processes such as sealing, charges the battery and discharges with 24A batteries, record
Charging capacity C2 and discharge capacity C3；It is finally weighed to battery and inner walkway, obtains weight m and internal resistance R.Wherein：When
Between t2, charging capacity C1, voltage V1 and V2, charging capacity C2 and discharge capacity C3 refer to the following table 1；Charging can be obtained from table 1
Average time T=249.9min, formation charging time t=T ± (3~6) σ, i.e. t of standard deviation sigma=0.87, then qualified lithium battery
=249.9 ± 2.61min, then 50 batteries all meet this requirement in table 1.
For (88~92%) * C1+C3=(100~110%) * nominal capacitys, for the ease of calculating, median is taken to be averaged
Value 90%, then the formula be：90%*C1+C3=(100~110%) * nominal capacitys, i.e. (0.9C1+C3)/48*100%=
100~110% be criterion of acceptability.
Then by upper table 1 can be calculated Δ V (Δ V=V1-V2), (0.9C1+C3)/48, C2/C3 numerical value refer to table 2,
It is big according to the lithium battery self discharge of 25,29, No. 31 of Δ V ＜ 5mV standard determinations serial number, it is undesirable, it regards as unqualified
Battery；It is unqualified for standard determination 2,28, No. 40 batteries with (0.9C1+C3)/48*100%=100~110%；With C2/C3*
100%=95~105% is that No. 17 batteries of standard determination are unqualified.
1 48Ah battery t2, C1, V1, V2, C2, C3 lists of table
2 48Ah battery Δs V of table, (0.9C1+C3)/48, C2/C3, weight m, internal resistance R lists
Through this embodiment, it is seen that have serial number 25,29,31,2,28,40,17 totally seven in 50 batteries of this experiment
Battery is unqualified, quickly separates underproof battery.The electricity that fills so as to effectively reduce forming and capacity dividing follows
Ring step reduces the quantity of partial volume equipment, so as to reduce the equipment cost and later stage working service cost of lithium battery production.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of quick forming and capacity dividing method of lithium battery, it is characterised in that：It comprises the steps of：
1. it is melted into：Lithium battery after injection electrolyte is melted into after standing, and record lithium battery, which charges to, in formation process cuts
Then only formation charging the time t and charging capacity C1 needed for 3.6~3.7V of voltage detects the voltage V1 of lithium battery；
2. aging：After lithium battery after chemical conversion is stood again, its voltage V2 is detected；
3. self discharge is screened：The lithium battery of self discharge qualification, i.e. voltage difference Δ V ＜ 5mV are filtered out using pressure difference test；
4. partial volume：Operation is charged and discharged to lithium battery, records charging capacity C2 and discharge capacity C3；
5. primary dcreening operation：Respectively to through step, 3. treated that all lithium batteries carry out the detection of weight and internal resistance, and select weight and
The qualified lithium battery of internal resistance is just qualified lithium battery；
6. stepping：The average value t and standard deviation sigma of the formation charging time t2 of all just qualified lithium batteries is calculated, it is full when simultaneously
The lithium battery for being enough lower standard is then qualified lithium battery：
a：Formation charging time t=T ± (3~6) σ of lithium battery；
b：(88-92%) * C1+C3=(100~110%) * nominal capacitys, and C2=(95%~105%) * C3；
c：Cell voltage changes delta V=V1-V2 is less than ＜ 5mV.
2. a kind of quick forming and capacity dividing method of lithium battery according to claim 1, it is characterised in that：Step 1. middle lithium battery
The temperature of standing is 40~50 DEG C, the time be 12~for 24 hours；Charging current is 0.05~0.1C；Detection lithium battery voltage V1 be
0.5~1h is detected after formation charging.
3. a kind of quick forming and capacity dividing method of lithium battery according to claim 1, it is characterised in that：Step 2. middle lithium battery
The temperature of standing is 40~50 DEG C, the time is 24~36h.
4. a kind of quick forming and capacity dividing method of lithium battery according to claim 1, it is characterised in that：Step 4. it is middle charging and
The electric current of discharge operation is 0.5~0.7C, and charge cutoff voltage 4.2V, discharge cut-off voltage is 3.6~3.7V.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738824A (en) * | 2018-12-29 | 2019-05-10 | 东莞市金源电池科技有限公司 | A kind of chemical conversion survey appearance method of lithium ion battery |
| CN109839598A (en) * | 2019-03-11 | 2019-06-04 | 合肥国轩高科动力能源有限公司 | A kind of non-destructive testing lithium ion cell positive reversible lithium loss method |
| CN110085935A (en) * | 2019-05-30 | 2019-08-02 | 骆驼集团武汉光谷研发中心有限公司 | A kind of method of power lithium-ion battery conformity classification |
| CN110297191A (en) * | 2019-08-07 | 2019-10-01 | 深圳市思商科技有限公司 | A kind of self-discharge of battery test method |
| CN110496799A (en) * | 2019-07-26 | 2019-11-26 | 浙江锋锂新能源科技有限公司 | High efficiency is at the method for differentiating abnormal battery core |
| CN110911757A (en) * | 2019-10-25 | 2020-03-24 | 合肥国轩高科动力能源有限公司 | Safe capacity grading method for ternary lithium battery |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
| CN112114266A (en) * | 2020-09-21 | 2020-12-22 | 郑州中科新兴产业技术研究院 | Method for realizing battery screening and grouping in one step |
| CN112421139A (en) * | 2020-11-27 | 2021-02-26 | 惠州亿纬锂能股份有限公司 | Production process of lithium ion battery |
| CN113839109A (en) * | 2021-08-17 | 2021-12-24 | 天能帅福得能源股份有限公司 | Method for rapidly grading capacity of lithium ion battery |
| CN114069075A (en) * | 2021-10-27 | 2022-02-18 | 风帆有限责任公司 | Lithium ion battery self-discharge screening method |
| CN114284589A (en) * | 2022-03-01 | 2022-04-05 | 深圳市海雷新能源有限公司 | Lithium battery intelligent monitoring management system based on internet |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738824A (en) * | 2018-12-29 | 2019-05-10 | 东莞市金源电池科技有限公司 | A kind of chemical conversion survey appearance method of lithium ion battery |
| CN109839598B (en) * | 2019-03-11 | 2021-07-09 | 合肥国轩高科动力能源有限公司 | Nondestructive testing method for reversible lithium loss of positive electrode of lithium ion battery |
| CN109839598A (en) * | 2019-03-11 | 2019-06-04 | 合肥国轩高科动力能源有限公司 | A kind of non-destructive testing lithium ion cell positive reversible lithium loss method |
| CN110085935A (en) * | 2019-05-30 | 2019-08-02 | 骆驼集团武汉光谷研发中心有限公司 | A kind of method of power lithium-ion battery conformity classification |
| CN110496799A (en) * | 2019-07-26 | 2019-11-26 | 浙江锋锂新能源科技有限公司 | High efficiency is at the method for differentiating abnormal battery core |
| CN110496799B (en) * | 2019-07-26 | 2021-05-07 | 浙江锋锂新能源科技有限公司 | Method for distinguishing abnormal cell by formation |
| CN110297191A (en) * | 2019-08-07 | 2019-10-01 | 深圳市思商科技有限公司 | A kind of self-discharge of battery test method |
| CN110911757A (en) * | 2019-10-25 | 2020-03-24 | 合肥国轩高科动力能源有限公司 | Safe capacity grading method for ternary lithium battery |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
| CN112114266A (en) * | 2020-09-21 | 2020-12-22 | 郑州中科新兴产业技术研究院 | Method for realizing battery screening and grouping in one step |
| CN112421139A (en) * | 2020-11-27 | 2021-02-26 | 惠州亿纬锂能股份有限公司 | Production process of lithium ion battery |
| CN112421139B (en) * | 2020-11-27 | 2022-03-11 | 惠州亿纬锂能股份有限公司 | Production process of lithium ion battery |
| CN113839109A (en) * | 2021-08-17 | 2021-12-24 | 天能帅福得能源股份有限公司 | Method for rapidly grading capacity of lithium ion battery |
| CN114069075A (en) * | 2021-10-27 | 2022-02-18 | 风帆有限责任公司 | Lithium ion battery self-discharge screening method |
| CN114069075B (en) * | 2021-10-27 | 2024-04-05 | 风帆有限责任公司 | Self-discharge screening method for lithium ion battery |
| CN114284589A (en) * | 2022-03-01 | 2022-04-05 | 深圳市海雷新能源有限公司 | Lithium battery intelligent monitoring management system based on internet |
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