CN106824831A - A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity - Google Patents
A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity Download PDFInfo
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- CN106824831A CN106824831A CN201611177795.9A CN201611177795A CN106824831A CN 106824831 A CN106824831 A CN 106824831A CN 201611177795 A CN201611177795 A CN 201611177795A CN 106824831 A CN106824831 A CN 106824831A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000000178 monomer Substances 0.000 claims abstract description 13
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 210000004027 cell Anatomy 0.000 claims description 54
- 238000012216 screening Methods 0.000 claims description 14
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 230000005059 dormancy Effects 0.000 claims description 6
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052493 LiFePO4 Inorganic materials 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 claims description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 3
- 229910001290 LiPF6 Inorganic materials 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 206010016766 flatulence Diseases 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 210000004460 N cell Anatomy 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000005955 Ferric phosphate Substances 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 abstract description 2
- 229940032958 ferric phosphate Drugs 0.000 abstract description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 abstract description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910018095 Ni-MH Inorganic materials 0.000 description 1
- 229910018477 Ni—MH Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000005686 dimethyl carbonates Chemical class 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/38—Collecting or arranging articles in groups
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- 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
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention discloses the manufacture method of the motive-power battery for improving lithium ion battery uniformity, prepares same batch ferric phosphate lithium cell monomer under the conditions of same process first, is screened by outward appearance, barcode scanning is carried out to cell, first charge-discharge circulation is carried out, battery capacity is recorded, stepping is carried out；Open-circuit voltage detection is carried out to be placed close under zero state-of-charge within 7 days, calculate open circuit voltage variations rate, it is grouped according to result of calculation, cell DC internal resistance and resistance average value in measurement group, propose the larger monomer of difference, n is selected from the garbled monomer of group carries out and is unified into battery cell module, and the consistent battery cell module of m performance parameters is connected into battery pack.The detection efficiency to lithium ion battery direct-current internal resistance is significantly improved, testing cost is reduced, motive-power battery has height ratio capacity, high-specific-power, and power battery charging can be made balanced, improves its security and service life.
Description
Technical field
The present invention relates to field of lithium ion battery, more particularly to a kind of motive-power battery for improving lithium ion battery uniformity
Manufacture method.
Background technology
Battery is one kind of power supply, is divided into one-shot battery and secondary cell.Up to the present, secondary cell system has been passed through
Lead-acid battery, nickel-cadmium cell, Ni-MH battery, the development in the generation of lithium ion battery four are gone through, battery performance is improved constantly, to cell body
The understanding of system is also being deepened constantly.At present, lithium ion battery is efficiency and specific energy highest secondary cell system, represents people
Class battery studies the highest level with technology.Since battery invention, without any one battery product as lithium ion battery this
Sample is widely available application rapidly.At present due to some equipment the need for, the use of lithium battery is not only limited in monocell
Use on, more exist in combination.Therefore, the coherence request to lithium battery is higher, such as by several battery combinations
Use, in a charging situation, if what is had is first full of, the also underfill having so can cause to have been filled with if continuing to charge
Battery overcharge, so as to cause the generation of unsafe factor；Under discharge scenario, what is had has discharged, but not having also of having, after
Can be crossed if continuous electric discharge and put, cause the permanent damage of battery.Either battery overcharge or crossed and put, can all cause list
The damage of inside battery structure and influence the service life of battery.For whole battery pack, the quality of one piece of battery is just enough to determine
The performance of fixed whole battery pack.Therefore, it is a very important ring the consistent monocell of performance to be categorized into a rank
Section.
After formation of Li-ion batteries is completed, even with a batch of battery, because production overcharges middle inside battery chemistry instead
The difference answered, not can determine that generation of factor etc. is likely to cause lithium after chemical conversion in the influence of extraneous factor and manufacturing process
The difference of ion battery performance.The method for separating of application mainly has two kinds now, and 1 is sorted by specified range of capacity,
The battery selected reaches unanimity on capacity；In assembled battery, then internal resistance to battery, surface temperature characteristic and self discharge
Etc. measuring sorting battery；2 is to be sorted using the range of capacity specified first, is compared by charging and discharging curve
Compared with the satisfactory battery of deviation.The shortcoming of above method is：Test condition is single, departing from battery actual condition,
Can only be referred to as one kind.
The screening of current lithium ion battery mainly carries out primary screening by the performance to battery in specific time period, for example, go out
The open-circuit voltage OCV of battery, DC internal resistance IR, capacity C apacity are once tested during factory, and is once according to setting
Threshold, packet screening is carried out by battery.The problem that this method is easily caused is identical not in the state of particular moment battery
Battery to-be can be equal to identical, the close battery of current time performance can no doubt be realized in a short time in groups good
Uniformity, but the inconsistent of battery performance variation tendency can cause battery performance drastically for being recycled for a long time
Decay.Can not possibly carry out under frequently screening conditions, the change in primary screening by battery under working condition before is turned into
For the standard of screening has great importance.
The content of the invention
In order to solve above-mentioned problems of the prior art, the present invention provides a kind of raising lithium ion battery uniformity
The manufacture method of motive-power battery, prepares same batch ferric phosphate lithium cell monomer under the conditions of same process first, passes through
Outward appearance is screened, and barcode scanning is carried out to cell, carries out first charge-discharge circulation, records battery capacity, carries out stepping；With close to zero
Being placed under state-of-charge carries out open-circuit voltage detection for 7 days, calculates open circuit voltage variations rate, is grouped according to result of calculation, measurement group
Interior cell DC internal resistance and resistance average value, propose the larger monomer of difference, and n is selected from the garbled monomer of group
Battery cell module is carried out and is unified into, the consistent battery cell module of m performance parameters is connected into battery pack.
Concrete scheme is as follows：
A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity, it is characterised in that comprise the following steps：
Positive electrode is LiFePO4, and negative material is Delanium, and electrolyte is lithium hexafluoro phosphate LiPF6/ ethylene carbonate
EC+ dimethyl carbonate DMC, electrolysis additive is redox shuttle 2,5- di-t-butyls-Isosorbide-5-Nitrae-dimethyl benzene, and barrier film is
Celgard 2400, prepares with a batch of battery cell under the conditions of same process；
Outward appearance screening is carried out to battery, battery must be without flatulence, without leakage, surface without scuffing, and apparent size is qualified；
The coding information of multiple cells is obtained using information barcode scanning equipment；
Battery capacity is recorded after multiple cells are carried out with first charge-discharge circulation, therefrom selection is with nominal capacity difference
The battery of 0.1-1% is same shelves battery cell；
With BTS6010c8 types battery test system to same shelves battery cell with 0.1C constant-current discharges to 2.5V, 10min is stood,
With 0.05C constant-current charges to 3.0V, shelve at normal temperatures 7 days, measure the open-circuit voltage of each cell with universal meter daily；
Open circuit voltage variations rate R carries out self-discharge of battery screening when being shelved using battery, and wherein R=(U7-U2)/5, U7 is the 7th day
Open-circuit voltage, U2 is the open-circuit voltage of the 2nd day, and R values are 2-3% for the moon self-discharge rate of the cell of 0-3mV/ days, as
A groups, R values are that the moon self-discharge rate of the cell more than 3mV/ days is less than 2%, used as B groups；R values are the monomer less than 0mV/ days
The moon self-discharge rate of battery is more than 3%, does not enter combo；
The DC internal resistance of each cell, respectively R in A groups/B groups that measurement is selected1, R2, R3... ..., Rn, then calculate A
The resistance average value of all lithium ion battery direct-current internal resistances in group/B groups, then by the resistance average value and each lithium ion battery
DC internal resistance be compared, therefrom reject compare the cell that difference accounts for resistance average value more than 8%；
N cell is selected in same Battery pack monomer from DC internal resistance difference in acceptability limit carries out combo, then uses
Copper current collecting tier is by n cell and is unified into battery cell module, and the consistent battery cell module of m performance parameters is connected into electricity
Pond group, n and m are the integer more than 2.
Wherein, normal temperature is 25 ± 2 DEG C.
The method of testing of DC internal resistance is：Charge to 40% battery charge SOC states to cell, dormancy 5s, then
With the electric current I1 electric discharge 5s of 0.3C, discharge cut-off voltage U1 is recorded, then with the electric current I2 electric discharge 5s of 3C, record electric discharge ends electricity
U2, dormancy 5s is pressed to terminate, DC internal resistance R direct currents=| U2-U1 |/| I2-I1 | of battery, unit is Ω.
The invention provides a kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity, with having as follows
Beneficial effect：
（1）After discharging completely, the change of voltage substantially, can be with the normal temperature lower long period for LiFePO4 monomer lithium ion battery
Self discharge screening is carried out using the open circuit rate of change R of cell；
（2）Lithium ion battery direct-current internal resistance is detected, is conducive to significantly improving the detection to lithium ion battery direct-current internal resistance
Efficiency, reduces testing cost, filters out the lithium ion battery of property abnormality, it is to avoid in bad battery combo to battery pack, and then
Improve the service life and security of Li-ion batteries piles.
（3）In motive-power battery, not only the performance parameter of each battery cell module is consistent, and composition battery unit mould
The performance parameter of each cell of block is also consistent so that motive-power battery has height ratio capacity, a high-specific-power, and can be with
Make power battery charging balanced, improve its security and service life.
Brief description of the drawings
Fig. 1 is the flow chart of the manufacture method of the motive-power battery that the present invention improves lithium ion battery uniformity.
Specific embodiment
The present invention will be described in more detail by specific embodiment below, but protection scope of the present invention is not received
It is limited to these embodiments.
Embodiment 1
Positive electrode is LiFePO4, and positive electrode active materials slurry is coated in into aluminum foil current collector surface is made positive pole, negative pole material
Expect to be Delanium, negative active material slurry is coated in into copper foil surface is made negative pole, and electrolyte is lithium hexafluoro phosphate
LiPF6The mixed solution of/ethylene carbonate EC+ dimethyl carbonates DMC, electrolysis additive is redox shuttle 2, the uncles of 5- bis-
Butyl-Isosorbide-5-Nitrae-dimethyl benzene, barrier film is Celgard 2400, is prepared under the conditions of same process with a batch of battery list
Body；
Outward appearance screening is carried out to battery, battery must be without flatulence, without leakage, surface without scuffing, and apparent size is qualified；
The coding information of multiple cells is obtained using information barcode scanning equipment；
Battery capacity is recorded after multiple cells are carried out with first charge-discharge circulation, therefrom selection is with nominal capacity difference
The battery of 0.1-1% is same shelves battery cell；
With BTS6010c8 types battery test system to same shelves battery cell with 0.1C constant-current discharges to 2.5V, 10min is stood,
With 0.05C constant-current charges to 3.0V, shelved 7 days at 25 DEG C of normal temperature, measure the open circuit electricity of each cell with universal meter daily
Pressure；
Open circuit voltage variations rate R carries out self-discharge of battery screening when being shelved using battery, and wherein R=(U7-U2)/5, U7 is the 7th day
Open-circuit voltage, U2 is the open-circuit voltage of the 2nd day, and R values are 2-3% for the moon self-discharge rate of the cell of 0-3mV/ days, as
A groups, R values are that the moon self-discharge rate of the cell more than 3mV/ days is less than 2%, used as B groups；R values are the monomer less than 0mV/ days
The moon self-discharge rate of battery is more than 3%, does not enter combo；
The DC internal resistance of each cell, 40% battery charge SOC shapes are charged to cell in the A groups that measurement is selected
State, dormancy 5s, then with the electric current I1 electric discharge 5s of 0.3C, records discharge cut-off voltage U1, then with the electric current I2 electric discharge 5s of 3C,
Discharge cut-off voltage U2 is recorded, dormancy 5s terminates, DC internal resistance R direct currents=| U2-U1 |/| I2-I1 | of battery, and unit is Ω, point
Wei not R1, R2, R3... ..., Rn, the resistance average value of all lithium ion battery direct-current internal resistances in A groups/B groups is then calculated, then
The resistance average value and the DC internal resistance of each lithium ion battery are compared, are therefrom rejected and is compared difference and account for resistance average value
More than 8% cell；
Test result is as shown in table 1.
Shown in DC internal resistance test result from table 1,6.0m Ω or so being distributed in the DC internal resistance of the lithium ion battery more,
The as resistance average value of the Battery pack DC internal resistance, numbering is that 5,22,38, No. 43 battery DC internal resistance values of batteries deviate flat
Average 6.0m Ω are rejected up to more than 8%.
4 cells are selected in same Battery pack monomer from DC internal resistance difference in acceptability limit carries out combo, then
Using copper current collecting tier is by 4 cells and is unified into battery cell module, the consistent battery cell module string of 14 performance parameters
It is unified into battery pack.
Embodiment 2
Normal temperature is 23 DEG C, and remaining is same as Example 1.
Embodiment 3
Normal temperature is 27 DEG C, and remaining is same as Example 1.
Embodiment 4
With A group identical methods, Screening Treatment is carried out to B groups and with composition battery pack, remaining is same as Example 1.
Although present disclosure is discussed in detail by above preferred embodiment, but it would be recognized that above-mentioned
Description be not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention
Various modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited by appended claim
It is fixed.
Claims (3)
1. it is a kind of improve lithium ion battery uniformity motive-power battery manufacture method, it is characterised in that comprise the following steps：
Positive electrode is LiFePO4, and negative material is Delanium, and electrolyte is lithium hexafluoro phosphate LiPF6/ ethylene carbonate EC
+ dimethyl carbonate DMC, electrolysis additive is redox shuttle 2,5- di-t-butyls-Isosorbide-5-Nitrae-dimethyl benzene, and barrier film is
Celgard 2400, prepares with a batch of battery cell under the conditions of same process；
Outward appearance screening is carried out to battery, battery must be without flatulence, without leakage, surface without scuffing, and apparent size is qualified；
The coding information of multiple cells is obtained using information barcode scanning equipment；
Battery capacity is recorded after multiple cells are carried out with first charge-discharge circulation, therefrom selection is with nominal capacity difference
The battery of 0.1-1% is same shelves battery cell；
With BTS6010c8 types battery test system to same shelves battery cell with 0.1C constant-current discharges to 2.5V, 10min is stood,
With 0.05C constant-current charges to 3.0V, shelve at normal temperatures 7 days, measure the open-circuit voltage of each cell with universal meter daily；
Open circuit voltage variations rate R carries out self-discharge of battery screening when being shelved using battery, and wherein R=(U7-U2)/5, U7 is the 7th day
Open-circuit voltage, U2 is the open-circuit voltage of the 2nd day, and R values are 2-3% for the moon self-discharge rate of the cell of 0-3mV/ days, as
A groups, R values are that the moon self-discharge rate of the cell more than 3mV/ days is less than 2%, used as B groups；R values are the monomer less than 0mV/ days
The moon self-discharge rate of battery is more than 3%, does not enter combo；
The DC internal resistance of each cell, respectively R in A groups/B groups that measurement is selected1, R2, R3... ..., Rn, then calculate A
The resistance average value of all lithium ion battery direct-current internal resistances in group/B groups, then by the resistance average value and each lithium ion battery
DC internal resistance be compared, therefrom reject compare the cell that difference accounts for resistance average value more than 8%；
N cell is selected in same Battery pack monomer from DC internal resistance difference in acceptability limit carries out combo, then uses
Copper current collecting tier is by n cell and is unified into battery cell module, and the consistent battery cell module of m performance parameters is connected into electricity
Pond group, n and m are the integer more than 2.
2. the manufacture method of motive-power battery according to claim 1, it is characterised in that：Normal temperature is 25 ± 2 DEG C.
3. the manufacture method of motive-power battery according to claim 1, it is characterised in that：The method of testing of DC internal resistance
For：40% battery charge SOC states, dormancy 5s, then with the electric current I1 electric discharge 5s of 0.3C, record are charged to cell
Discharge cut-off voltage U1, is then discharged 5s with the electric current I2 of 3C, records discharge cut-off voltage U2, and dormancy 5s terminates, battery it is straight
Stream internal resistance R direct currents=| U2-U1 |/| I2-I1 |, unit is Ω.
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Cited By (41)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107225104A (en) * | 2017-07-27 | 2017-10-03 | 东莞威胜储能技术有限公司 | A kind of method for separating of battery |
| CN107362989A (en) * | 2017-07-27 | 2017-11-21 | 东莞威胜储能技术有限公司 | A kind of method for separating of lithium-ion-power cell |
| CN107377422A (en) * | 2017-07-27 | 2017-11-24 | 东莞威胜储能技术有限公司 | A kind of method for separating of cell |
| CN107607874A (en) * | 2017-08-10 | 2018-01-19 | 上海交通大学 | The bikini screening technique of quick charge/discharge lithium ion battery |
| CN107597621A (en) * | 2017-10-20 | 2018-01-19 | 合肥国轩高科动力能源有限公司 | Screening method and matching method for improving consistency of ternary lithium ion battery pack |
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