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 PDF

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Publication number
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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battery
cell
lithium ion
internal resistance
motive
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CN201611177795.9A
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Chinese (zh)
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金同林
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金同林
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07CPOSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00Sorting 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
    • B07C5/34Sorting according to other particular properties
    • B07C5/344Sorting according to other particular properties according to electric or electromagnetic properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07CPOSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00Sorting 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
    • B07C5/36Sorting apparatus characterised by the means used for distribution
    • B07C5/38Collecting or arranging articles in groups
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389Measuring internal impedance, internal conductance or related variables
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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

A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity

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.
CN201611177795.9A 2016-12-19 2016-12-19 A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity CN106824831A (en)

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CN109127473A (en) * 2018-07-19 2019-01-04 中航锂电技术研究院有限公司 Based on the method that standing open-circuit voltage quickly sorts cascade utilization lithium battery whens waiting
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CN109814042A (en) * 2019-01-18 2019-05-28 合肥国轩高科动力能源有限公司 A kind of analysis method of lithium ion battery in charge and discharge process middle impedance variation tendency
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