CN105680108B - Screening method of lithium ion battery - Google Patents
Screening method of lithium ion battery Download PDFInfo
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- CN105680108B CN105680108B CN201610226755.2A CN201610226755A CN105680108B CN 105680108 B CN105680108 B CN 105680108B CN 201610226755 A CN201610226755 A CN 201610226755A CN 105680108 B CN105680108 B CN 105680108B
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- Prior art keywords
- internal resistance
- screening
- battery core
- consistency
- battery
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- 238000012216 screening Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 17
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000013461 design Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- 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 screening method of lithium ion batteries, which comprises the following steps: carrying out capacity consistency screening on the batteries in the same batch; screening the alternating current internal resistance consistency of the battery cells meeting the capacity requirement; screening the direct current internal resistance consistency of the battery cells meeting the alternating current consistency requirement; and screening the consistency of the ratio of the direct current internal resistance to the alternating current internal resistance of the battery cell meeting the requirement of the consistency of the direct current internal resistance. The invention screens the batteries through the characteristics of the direct current internal resistance and the alternating current internal resistance, and can quickly and accurately screen the batteries with higher consistency for matching, thereby improving the service performance of the battery pack and prolonging the service life of the battery pack.
Description
Technical field
The present invention relates to technical field of lithium ion, and in particular to a kind of screening technique of lithium ion battery.
Background technology
Lithium ion battery is used widely because of its high-energy density and long circulation life.However when multiple batteries pass through
It is in series or in parallel in groups when, battery pack often has that capacity attenuation is too fast, the service life is shorter, this is because battery cell
Between nonuniformity and caused by.How simple, reliable method for separating is utilized, filters out performance battery as consistent as possible
For in groups, there is important science and practice significance to popularization and application of the lithium ion battery in extensive energy storage.
Invention content
The purpose of the present invention is to provide a kind of screening technique of lithium ion battery, this method.
To achieve the above object, present invention employs following technical schemes：
A kind of screening technique of lithium ion battery, includes the following steps：
（1）Capacity uniformity screening is carried out to same batch battery；
（2）Battery core to meeting capacity requirement carries out the screening of AC internal Resistance consistency；
（3）Battery core to meeting exchange coherence request carries out the screening of DC internal resistance consistency；
（4）Battery core to meeting DC internal resistance coherence request carries out the sieve of DC internal resistance and AC internal Resistance ratio consistency
Choosing.
Step（1）In, it is described that Capacity uniformity screening is carried out to same batch battery, it is realized by following steps：It selects
Single battery core of the range of capacity between its rated capacity 102.5%~97.5%.
Step（2）In, the screening of the AC internal Resistance consistency is realized by following steps：It is surveyed using internal resistance test device
The AC internal Resistance of battery core is tried, the single battery core that AC internal Resistance difference is more than 5% is rejected.
Step（3）In, the screening of the DC internal resistance consistency is realized by following steps：It is tested using electricity current method
The DC internal resistance of battery core rejects the single battery core that DC internal resistance difference is more than 5%.
Step（4）In, the battery core carries out the screening of DC internal resistance and AC internal Resistance ratio consistency, including following sequence
Step：
（a）Calculate ratio R=DCR/ACR of DC internal resistance DCR and AC internal Resistance ACR；
（b）Select battery core of the ratio R between 1.95~2.05.
The DC internal resistance that battery core is tested using electricity current method, including following sequential steps：
（A）Measure the quiescent voltage V1 under battery core full power state；
（B）It is large current discharge 2 seconds with 5C, acquisition heavy-current discharge terminates the voltage V2 of moment；
（C）Pass through formula DCR=(V1-V2)/I5C, DC internal resistance DCR is calculated, wherein I5CIndicate 5C electric currents.
As shown from the above technical solution, the screening technique of lithium ion battery of the present invention, passes through DC internal resistance and friendship
The characteristic of stream internal resistance screens battery, can rapidly and accurately filter out the higher battery of consistency and carry out combo, to
It improves the performance of battery pack and extends the service life of battery pack.
Description of the drawings
Fig. 1 is cyclic curve figure of the battery of the present invention under 55 degree of high temperature 1C states.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings：
The screening technique of the lithium ion battery of the present embodiment, includes the following steps：
It is the single battery core of 30Ah to take 50 IFP20100140, nominal capacity, and primary number 1-30 is spare, according to this hair
Bright content carries out：
S1：It is carried out after expiring full of cycle is put 5 weeks with 50 batteries of 15A electric currents pair, state of working to the last minute cut-off is spare；It records the 5th week
Discharge capacity C0 to C50 it is spare, select single battery core of the range of capacity between its rated capacity 102.5%~97.5%, i.e.,
Capacity is selected in the battery core of 29.25Ah to 30.75Ah, rejects non-compliant battery core.
S2：Test the above-mentioned AC internal Resistance ACR1-ACR50 for meeting Capacity uniformity standard battery cell（It has removed and above-mentioned has not been inconsistent
Close the battery core of Capacity uniformity）；Then the single battery core that AC internal Resistance difference is more than 5% is rejected, because of the average AC internal Resistance mark of battery
Quasi- value is 5.5 bold and unconstrained Europe, then the battery core between 5.5m Ω ± 5% is qualified battery core, that is, selects AC internal Resistance and arrived 5.225
Battery core between 5.775 rejects the not battery core in the numberical range.
S3：The battery core of the above qualification is selected, DC internal resistance test is carried out：Above-mentioned full electric state battery core, with 30A current discharges
After 30min, collection voltages V1 after 1h is stood, with 150A current discharges 2 seconds, acquisition electric discharge terminated transient voltage V2, then in direct current
Resistance DCR=（V1-V2）/ 150A, unit are milliohm, and serialization, DCR1-DCR50 are carried out to the DCR after test（The volume of battery core is removed
It number is not present）.
S4：The DCR values tested above, divided by correspond to the ACR values of battery core number, number R1-R50（The above sieve is not met
Except selecting the battery core of program to number）；Qualified battery core of the R values in 1.95 to 2.05 ranges is screened, unqualified battery core is rejected；
38 battery cores of the above qualified battery core are selected, two 6 and module are welded into, are labeled as No. 1 and No. 2 modules, rejecting
Unqualified battery core be equally welded into two 6 and modules, be labeled as No. 3 and No. 4 modules；No. 1, No. 2, No. 3, No. 4 mould splits
Full be full of of 30A electric currents does not put capable cycle under the conditions of 55 degree, the corresponding curves 1 of cyclic curve such as Fig. 1, curve 2, curve 3, song
Line 4；Cyclic curve is compared, screening technique provided by the invention is verified, effectively improves the consistency of module in parallel, and then extend simultaneously
The cycle life of gang mould group；
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of screening technique of lithium ion battery, which is characterized in that include the following steps：
（1）Capacity uniformity screening is carried out to same batch battery；
（2）The screening of AC internal Resistance consistency is carried out to meeting the battery core that capacity unanimously requires；
（3）Battery core to meeting AC internal Resistance coherence request carries out the screening of DC internal resistance consistency：It is surveyed using electricity current method
The DC internal resistance of battery core is tried, the single battery core that DC internal resistance difference is more than 5% is rejected：
（A）Measure the quiescent voltage V1 under battery core full power state；
（B）It is large current discharge 2 seconds with 5C, acquisition heavy-current discharge terminates the voltage V2 of moment；
（C）Pass through formula DCR=(V1-V2)/I5C, DC internal resistance DCR is calculated, wherein I5CIndicate 5C electric currents；
（4）Battery core to meeting DC internal resistance coherence request carries out the screening of DC internal resistance and AC internal Resistance ratio consistency：
（a）Calculate ratio R=DCR/ACR of DC internal resistance DCR and AC internal Resistance ACR；
（b）Select battery core of the ratio R between 1.95~2.05.
2. the screening technique of lithium ion battery according to claim 1, which is characterized in that step（1）In, it is described to same
Batch battery carries out Capacity uniformity screening, is realized by following steps：Select range of capacity its rated capacity 102.5%~
Single battery core between 97.5%.
3. the screening technique of lithium ion battery according to claim 1, which is characterized in that step（2）In, in the exchange
The screening for hindering consistency, is realized by following steps：The AC internal Resistance of battery core is tested using internal resistance test device, rejects AC internal Resistance
Difference is more than 5% single battery core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610226755.2A CN105680108B (en) | 2016-04-13 | 2016-04-13 | Screening method of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610226755.2A CN105680108B (en) | 2016-04-13 | 2016-04-13 | Screening method of lithium ion battery |
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| Publication Number | Publication Date |
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| CN105680108A CN105680108A (en) | 2016-06-15 |
| CN105680108B true CN105680108B (en) | 2018-07-17 |
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| CN201610226755.2A Active CN105680108B (en) | 2016-04-13 | 2016-04-13 | Screening method of lithium ion battery |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108535650B (en) * | 2017-03-01 | 2021-02-09 | 苏州协鑫集成科技工业应用研究院有限公司 | Lithium ion battery pack consistency judging method and system |
| CN107681184B (en) * | 2017-09-14 | 2020-02-07 | 力神动力电池系统有限公司 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101907688B (en) * | 2010-08-02 | 2012-08-22 | 天津力神电池股份有限公司 | Method for detecting electrical property consistency of lithium ion battery |
| CN203519801U (en) * | 2013-09-25 | 2014-04-02 | 深圳市精实机电科技有限公司 | Automatic testing and sorting device of battery voltage internal resistance test machine |
| CN103464388B (en) * | 2013-09-26 | 2015-04-01 | 上海动力储能电池系统工程技术有限公司 | Lithium ion battery screening method |
| CN104607395B (en) * | 2013-11-01 | 2017-03-15 | 北汽福田汽车股份有限公司 | Lithium ion battery method for separating |
| CN104681851B (en) * | 2015-02-09 | 2017-08-29 | 威睿电动汽车技术（苏州）有限公司 | A kind of vapour vehicle lithium-ion power battery method for group matching |
| CN104668207A (en) * | 2015-02-16 | 2015-06-03 | 深圳市沃特玛电池有限公司 | Method for enhancing screening consistency of lithium-ion power battery |
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