CN105680108A - Method for screening lithium ion batteries - Google Patents
Method for screening lithium ion batteries Download PDFInfo
- Publication number
- CN105680108A CN105680108A CN201610226755.2A CN201610226755A CN105680108A CN 105680108 A CN105680108 A CN 105680108A CN 201610226755 A CN201610226755 A CN 201610226755A CN 105680108 A CN105680108 A CN 105680108A
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- Prior art keywords
- internal resistance
- screening
- battery core
- lithium ion
- conforming
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M10/4285—Testing apparatus
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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 & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a method for screening lithium ion batteries.The method includes the steps that capacity consistency screening is conducted on batteries of the same bath; cores meeting the capacity requirement are subjected to alternating-current internal resistance consistency screening; the cores meeting the alternating-current consistency requirement are subjected to direct-current internal resistance consistency screening; the cores meeting the direct-current internal resistance consistency are subjected to direct-current internal resistance and alternating-current internal resistance ration consistency screening.The batteries are screened according to direct-current internal resistance and alternating-current internal resistance characteristics, the batteries high in consistency can be quickly and accurately screened for matching, use performance of battery packs is improved, and the service life of the battery packs is prolonged.
Description
Technical field
The present invention relates to technical field of lithium ion, be specifically related to the screening technique of a kind of lithium ion battery.
Background technology
Lithium ion battery is used widely because of its high-energy-density and long circulation life. But when multiple batteries by series or in parallel in groups time, often there is the problem that capacity attenuation is too fast, the life-span is shorter in set of cells, this be due to battery cell between nonuniformity and cause. How to utilize method for separating simple, reliable, filter out performance battery consistent as far as possible in groups, lithium ion battery popularization and application in extensive energy storage are had important science and practice significance.
Summary of the invention
It is an object of the invention to provide the screening technique of a kind of lithium ion battery, the method.
For achieving the above object, present invention employs techniques below scheme:
The screening technique of a kind of lithium ion battery, comprises the following steps:
(1) same batch of battery is carried out Capacity uniformity screening;
(2) battery core meeting capacity requirement is carried out the conforming screening of AC internal Resistance;
(3) battery core of satisfied exchange coherence request is carried out the conforming screening of DC internal resistance;
(4) battery core meeting DC internal resistance coherence request is carried out DC internal resistance and the conforming screening of AC internal Resistance ratio.
In step (1), described same batch of battery is carried out Capacity uniformity screening, realized by following steps: select range of capacity monomer battery core between its rated capacity 102.5%～97.5%.
In step (2), the conforming screening of described AC internal Resistance, realized by following steps: adopt the AC internal Resistance of internal resistance test device test battery core, reject the AC internal Resistance difference monomer battery core more than 5%.
In step (3), the conforming screening of described DC internal resistance, realized by following steps: adopt the DC internal resistance of electricity current method test battery core, reject the DC internal resistance difference monomer battery core more than 5%.
In step (4), described battery core carries out DC internal resistance and the conforming screening of AC internal Resistance ratio, including following sequence step:
A () calculates the ratio R=DCR/ACR of DC internal resistance DCR and AC internal Resistance ACR;
B () selects ratio R battery core between 1.95～2.05.
The DC internal resistance of described employing electricity current method test battery core, including following sequence step:
(A) the quiescent voltage V1 under battery core full power state is measured;
(B) use 5C heavy-current discharge 2 seconds, gather heavy-current discharge and terminate the voltage V2 of moment;
(C) by formula DCR=(V1-V2)/I5C, calculate and obtain DC internal resistance DCR, wherein, I5CRepresent 5C electric current.
As shown from the above technical solution, the screening technique of lithium ion battery of the present invention, by the characteristic of DC internal resistance and AC internal Resistance, battery is screened, the higher battery of concordance can be filtered out rapidly and accurately and carry out combo, thus improve the serviceability of set of cells and extending the service life of set of cells.
Accompanying drawing explanation
Fig. 1 is the battery of the present invention cyclic curve figure under 55 degree of high temperature 1C states.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described:
The screening technique of the lithium ion battery of the present embodiment, comprises the following steps:
Taking 50 IFP20100140, nominal capacity is the monomer battery core of 30Ah, and once numbering 1-30 is standby, carries out according to present invention:
S1: with 15A electric current 50 batteries being completely full of after putting circulation 5 weeks, state of working to the last minute cut-off is standby; The discharge capacity C0 to C50 recording the 5th week is standby, selects range of capacity monomer battery core between its rated capacity 102.5%～97.5%, namely selects the capacity battery core at 29.25Ah to 30.75Ah, reject non-compliant battery core.
S2: test the above-mentioned AC internal Resistance ACR1-ACR50(meeting Capacity uniformity standard battery cell and removed the above-mentioned battery core not meeting Capacity uniformity); Then the AC internal Resistance difference monomer battery core more than 5% is rejected, because the average AC internal Resistance standard value of battery is 5.5 person of outstanding talent Europe, then being positioned at the battery core between 5.5m Ω ± 5% is qualified battery core, namely selects AC internal Resistance battery core between 5.225 to 5.775, rejects the not battery core in this numerical range.
S3: select above qualified battery core, carry out DC internal resistance test: above-mentioned full electricity state battery core, after 30A current discharge 30min, stand and gather voltage V1 after 1h, with 150A current discharge 2 seconds, gather electric discharge and terminate transient voltage V2, then DC internal resistance DCR=(V1-V2)/150A, unit is milliohm, and the DCR after test is carried out serialization, and DCR1-DCR50(has removed the numbering of battery core and has been absent from).
S4: the DCR value of above test, divided by the ACR value of corresponding battery core numbering, is numbered R1-R50(and does not meet except the battery core of above screening sequence numbers); The screening R value qualified battery core in 1.95 to 2.05 scopes, rejects defective battery core;
Select 38 battery cores of above qualified battery core, be welded into two 6 and module, be labeled as No. 1 and No. 2 modules, the defective battery core rejected is welded into two 6 and module equally, is labeled as No. 3 and No. 4 modules; No. 1, No. 2, No. 3, No. 4 modules, under 55 degree of conditions, 30A electric current is completely full of and puts and be circulated respectively, corresponding for cyclic curve such as Fig. 1 curve 1, curve 2, curve 3, curve 4; Contrast cyclic curve, verifies screening technique provided by the invention, is effectively improved the concordance of module in parallel, and then extends the cycle life of module in parallel;
Embodiment described above is only that the preferred embodiment of the present invention is described; not the scope of the present invention is defined; under the premise designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention is determined.
Claims (6)
1. the screening technique of a lithium ion battery, it is characterised in that comprise the following steps:
(1) same batch of battery is carried out Capacity uniformity screening;
(2) battery core meeting capacity requirement is carried out the conforming screening of AC internal Resistance;
(3) battery core of satisfied exchange coherence request is carried out the conforming screening of DC internal resistance;
(4) battery core meeting DC internal resistance coherence request is carried out DC internal resistance and the conforming screening of AC internal Resistance ratio.
2. the screening technique of lithium ion battery according to claim 1, it is characterized in that, in step (1), described same batch of battery is carried out Capacity uniformity screening, realized by following steps: select range of capacity monomer battery core between its rated capacity 102.5%～97.5%.
3. the screening technique of lithium ion battery according to claim 1, it is characterized in that, in step (2), the conforming screening of described AC internal Resistance, realized by following steps: adopt the AC internal Resistance of internal resistance test device test battery core, reject the AC internal Resistance difference monomer battery core more than 5%.
4. the screening technique of lithium ion battery according to claim 1, it is characterized in that, in step (3), the conforming screening of described DC internal resistance, realized by following steps: adopt the DC internal resistance of electricity current method test battery core, reject the DC internal resistance difference monomer battery core more than 5%.
5. the screening technique of lithium ion battery according to claim 1, it is characterised in that in step (4), described battery core carries out DC internal resistance and the conforming screening of AC internal Resistance ratio, including following sequence step:
A () calculates the ratio R=DCR/ACR of DC internal resistance DCR and AC internal Resistance ACR;
B () selects ratio R battery core between 1.95～2.05.
6. the screening technique of lithium ion battery according to claim 4, it is characterised in that the DC internal resistance of described employing electricity current method test battery core, including following sequence step:
(A) the quiescent voltage V1 under battery core full power state is measured;
(B) use 5C heavy-current discharge 2 seconds, gather heavy-current discharge and terminate the voltage V2 of moment;
(C) by formula DCR=(V1-V2)/I5C, calculate and obtain DC internal resistance DCR, wherein, I5CRepresent 5C electric current.
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| CN201610226755.2A CN105680108B (en) | 2016-04-13 | 2016-04-13 | A kind of screening technique of lithium ion battery |
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| CN201610226755.2A CN105680108B (en) | 2016-04-13 | 2016-04-13 | A kind of screening technique of lithium ion battery |
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| CN105680108B CN105680108B (en) | 2018-07-17 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207265A (en) * | 2016-07-26 | 2016-12-07 | 金龙联合汽车工业（苏州）有限公司 | A kind of raising conforming preparation method of lithium ion battery |
| CN106655405A (en) * | 2017-01-19 | 2017-05-10 | 浙江邻居智能科技有限公司 | Charging maintenance structure and method of intelligent BMS lithium battery |
| CN107681184A (en) * | 2017-09-14 | 2018-02-09 | 力神动力电池***有限公司 | A kind of quick method for group matching of lithium ion battery |
| CN108535650A (en) * | 2017-03-01 | 2018-09-14 | 苏州协鑫集成科技工业应用研究院有限公司 | Li-ion batteries piles consistency discrimination method and system |
| CN108899596A (en) * | 2018-06-29 | 2018-11-27 | 广东天劲新能源科技股份有限公司 | A kind of power battery method for group matching |
| CN109212363A (en) * | 2018-10-26 | 2019-01-15 | 北京长城华冠汽车科技股份有限公司 | The detection method and device of battery core performance |
| CN109585950A (en) * | 2018-12-08 | 2019-04-05 | 广东维都利新能源有限公司 | A kind of method for group matching improving polymer Li-ion battery cycle performance |
| CN109765497A (en) * | 2017-11-02 | 2019-05-17 | 北京长城华冠汽车科技股份有限公司 | A kind of lithium battery method for group matching |
| CN113655395A (en) * | 2021-08-17 | 2021-11-16 | 星恒电源股份有限公司 | Method for evaluating service state of lithium battery for electric bicycle |
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| CN104681851A (en) * | 2015-02-09 | 2015-06-03 | 威睿电动汽车技术（苏州）有限公司 | Method for matching lithium ion power batteries for automobiles |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207265A (en) * | 2016-07-26 | 2016-12-07 | 金龙联合汽车工业（苏州）有限公司 | A kind of raising conforming preparation method of lithium ion battery |
| CN106207265B (en) * | 2016-07-26 | 2019-01-15 | 金龙联合汽车工业（苏州）有限公司 | A kind of preparation method improving lithium ion battery consistency |
| CN106655405A (en) * | 2017-01-19 | 2017-05-10 | 浙江邻居智能科技有限公司 | Charging maintenance structure and method of intelligent BMS lithium battery |
| CN108535650A (en) * | 2017-03-01 | 2018-09-14 | 苏州协鑫集成科技工业应用研究院有限公司 | Li-ion batteries piles consistency discrimination method and system |
| CN107681184A (en) * | 2017-09-14 | 2018-02-09 | 力神动力电池***有限公司 | A kind of quick method for group matching of lithium ion battery |
| CN107681184B (en) * | 2017-09-14 | 2020-02-07 | 力神动力电池***有限公司 | Quick matching method of lithium ion batteries |
| CN109765497A (en) * | 2017-11-02 | 2019-05-17 | 北京长城华冠汽车科技股份有限公司 | A kind of lithium battery method for group matching |
| CN108899596A (en) * | 2018-06-29 | 2018-11-27 | 广东天劲新能源科技股份有限公司 | A kind of power battery method for group matching |
| CN109212363A (en) * | 2018-10-26 | 2019-01-15 | 北京长城华冠汽车科技股份有限公司 | The detection method and device of battery core performance |
| CN109585950A (en) * | 2018-12-08 | 2019-04-05 | 广东维都利新能源有限公司 | A kind of method for group matching improving polymer Li-ion battery cycle performance |
| CN113655395A (en) * | 2021-08-17 | 2021-11-16 | 星恒电源股份有限公司 | Method for evaluating service state of lithium battery for electric bicycle |
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