CN105633472A - Self-discharge rate consistency matching and screening method for lithium-ion battery - Google Patents

Self-discharge rate consistency matching and screening method for lithium-ion battery Download PDF

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CN105633472A
CN105633472A CN201511015548.4A CN201511015548A CN105633472A CN 105633472 A CN105633472 A CN 105633472A CN 201511015548 A CN201511015548 A CN 201511015548A CN 105633472 A CN105633472 A CN 105633472A
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constant
battery
current
discharge
self
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CN105633472B (en
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关成善
宗继月
李涛
王勇
周会
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山东精工电子科技有限公司
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    • 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
    • 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
    • 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 invention provides a self-discharge rate consistency matching and screening method for a lithium-ion battery. The method is characterized by comprising the following specific steps: (1) low-current formation, namely carrying out constant-current charging at 0.1C for 4h and then carrying out constant-current charging at 0.2C for 2h for formation; (2) first shelving, namely shelving the battery at 40+/-3 DEG C for 20-30h; (3) charge-discharge test, namely carrying out constant-current and constant-voltage charging at 0.2-1C on the battery, carrying out constant-current discharging for 2-4 times, and finally carrying out constant-current and constant-voltage full charging at 0.2-1C; (4) second shelving, namely shelving the battery at 45+/-3 DEG C for 48-72h; (5) constant-current and time-limiting charging; (6) second shelving; (7) self-discharge rate calculation, after shelving the battery for the second time, carrying out constant-current discharging at 0.2-1C, carrying out constant-current and constant-voltage charging at 0.2-1C, carrying out constant-current discharging at 0.2-1C and carrying out constant-current and constant-voltage charging at 0.2-1C.

Description

A kind of lithium ion battery self discharge rate consistence group gas-mixing screening method
Technical field
The present invention relates to a kind of technical field of lithium ion, particularly relate to a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method.
Background technology
Along with the implementation of whole world new-energy automobile, the research boom of power lithium-ion battery grows to even greater heights. Current driving force lithium ion battery market is mainly based on nickle cobalt lithium manganate battery, nickel cobalt lithium aluminate lithium manganate battery, ferric phosphate lithium cell. To be carried out series-parallel connection combination when battery cell is combined into series of cells, reach required voltage and capacity. Owing to the difference of battery cell raw material variance, process of manufacture state modulator causes battery consistency to differ greatly. After battery cell combination combo, due to the difference between monomer, in charge and discharge process, the difference of battery cell can become big gradually, finally causes fall sharply the work-ing life of battery. Judge that the significant parameter of battery consistency difference has capacity, voltage, internal resistance, self-discharge rate at present. And this several parameter be easier to obtain be capacity, voltage, internal resistance. And self-discharge rate is more difficult determines. All there is self-discharge in any battery, self-discharge is the result that inside battery micro-short circuit causes. The severity of micro-short circuit determines the size of battery self discharge rate. The proportionality action having power-supply management system in current process of charging, but effect is general not good, and battery life is played key effect by self-discharge rate consistence situation. Voltage height after generally shelving with battery at present determines the size of self-discharge rate, but cell voltage just indirect reflection self-discharge size, can not accurately reflect the self-discharge rate of battery. Especially ferric phosphate lithium cell, relatively curve is relatively mild for voltage platform, and the cell voltage of test is identical, and its capacity may differ 10 ~ 15%. The judgement of battery consistency is brought bigger difficulty.
Summary of the invention
The present invention provides a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method, solves the problem that lithium ion battery combo self-discharge rate unanimously is difficult to effectively determine, avoids self-discharge battery combination combo that is big or self-discharge consistence difference to use.
For achieving the above object, the technical solution used in the present invention is: a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method, it is characterized in that: carry out after chemical conversion completes at lithium ion battery, make inside battery through convergent-divergent process by discharge and recharge, again by shelving for the first time, constant current is charged in limited time, second time is shelved, the calculating of self-discharge rate, determining battery self discharge rate and carry out classification combo and use, concrete steps are as follows:
The first step, small area analysis is melted into, and constant current 0.1C charges 4 hours, then constant current 0.2C charging 2h chemical conversion;
2nd step, first time shelves, and shelves 20 ~ 30 hours for 40 �� 3 DEG C;
3rd step, charge-discharge test, battery 0.2C ~ 1C constant-current constant-voltage charging, constant-current discharge, carry out 2 ~ 4 discharge and recharges, and last 0.2C ~ 1C constant current constant voltage is fully charged;
4th step, second time is shelved, and under 45 �� 3 DEG C of environment, shelves 48 hours ~ 72 hours;
5th step, constant current is charging in limited time, battery is carried out 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant current charge, and the time that limits, between 50 minutes ~ 285 minutes, is as the criterion to be charged into the 85 ~ 95% of rated capacity, and the capacity being charged into is labeled as C1;
6th step, second time is shelved, and shelves 30 ~ 50 days under battery 23 �� 3 DEG C of environment;
7th step, self-discharge rate calculates, and battery second time carries out 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant-current constant-voltage charging, 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant-current constant-voltage charging after shelving, and this step first time loading capacity is labeled as C2,This step second time loading capacity is labeled as C3, self-discharge rate ��=(C1-C2)/C1��100%��
In this method, described lithium ion battery is ferric phosphate lithium cell, nickle cobalt lithium manganate battery, nickel cobalt lithium aluminate battery or lithium manganate battery.
In this method, ferric phosphate lithium cell constant-current constant-voltage charging stopping potential is 3.65V, constant-current discharge stopping potential is 2.5V, and nickel-cobalt-manganese ternary battery, nickel cobalt aluminium ternary battery, lithium manganate battery constant-current constant-voltage charging stopping potential are 4.2V, and constant-current discharge stopping potential is 2.75V.
In this method, described self-discharge rate �ǡ�3%, self-discharge rate difference DELTA �ǡ�1% of same Battery pack in combo process.
In this method, described C3For reference value when capacity divides grade.
The advantageous effect of the present invention is: 1, battery high-temperature is shelved with the infiltration benefiting lithium-ion battery electrolytes, and the expansion of high temperature can allow the micro-short circuit point aggravation of inside battery be of value to later stage self-discharge screening; 2, because inside battery can with the process expanding and shrinking in charge and discharge process, battery carries out repeatedly discharge and recharge after chemical conversion, is of value to the embodiment of inside battery micro-short circuit and the screening of self-discharge rate; 3, due to the size that voltage is indirect reaction cell self-discharge, there is discordance. The present invention is lost by normal temperature shelf test capacity, calculates self-discharge rate. And the difference of self-discharge rate is controlled, effectively improve the consistence of assembled battery self-discharge rate.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described: a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method, it is characterized in that: carry out after chemical conversion completes at lithium ion battery, make inside battery through convergent-divergent process by discharge and recharge, again by shelving for the first time, constant current is charged in limited time, second time is shelved, the calculating of self-discharge rate, determining battery self discharge rate and carry out classification combo and use, concrete steps are as follows:
The first step, small area analysis is melted into, and constant current 0.1C charges 4 hours, then constant current 0.2C charging 2h chemical conversion;
2nd step, first time shelves, and shelves 20 ~ 30 hours for 40 �� 3 DEG C;
3rd step, charge-discharge test, battery 0.2C ~ 1C constant-current constant-voltage charging, constant-current discharge, carry out 2 ~ 4 discharge and recharges, and last 0.2C ~ 1C constant current constant voltage is fully charged;
4th step, second time is shelved, and under 45 �� 3 DEG C of environment, shelves 48 hours ~ 72 hours;
5th step, constant current is charging in limited time, battery is carried out 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant current charge, and the time that limits, between 50 minutes ~ 285 minutes, is as the criterion to be charged into the 85 ~ 95% of rated capacity, and the capacity being charged into is labeled as C1;
6th step, second time is shelved, and shelves 30 ~ 50 days under battery 23 �� 3 DEG C of environment;
7th step, self-discharge rate calculates, and battery second time carries out 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant-current constant-voltage charging, 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant-current constant-voltage charging after shelving, and this step first time loading capacity is labeled as C2,This step second time loading capacity is labeled as C3, self-discharge rate ��=(C1-C2)/C1�� 100%. In the present embodiment, described lithium ion battery is ferric phosphate lithium cell, nickle cobalt lithium manganate battery, nickel cobalt lithium aluminate battery or lithium manganate battery. In the present embodiment, ferric phosphate lithium cell constant-current constant-voltage charging stopping potential is 3.65V, constant-current discharge stopping potential is 2.5V, and nickel-cobalt-manganese ternary battery, nickel cobalt aluminium ternary battery, lithium manganate battery constant-current constant-voltage charging stopping potential are 4.2V, and constant-current discharge stopping potential is 2.75V. In the present embodiment, described self-discharge rate �ǡ�3%, self-discharge rate difference DELTA �ǡ�1% of same Battery pack in combo process.
In the present embodiment, described C3For reference value when capacity divides grade.
Embodiment 1
10Ah self discharge of lithium iron phosphate battery screening combo, concrete steps are as follows:
The first step, small area analysis is melted into, and constant current 0.1C charges 4 hours, then constant current 0.2C charging 2h chemical conversion;
2nd step, high temperature is shelved for the first time, and 40 �� 3 DEG C of high temperature shelve 24 hours;
3rd step, charge-discharge test, battery 0.5C constant current charge is to 3.65V, turn 3.65V constant voltage charge to electric current < 0.02C, shelve 5 minute after, 0.5C constant-current discharge, to voltage 2.5V, carries out 3 discharge and recharges, finally with 0.5C constant current charge to 3.65V, turn 3.65V constant voltage charge to electric current < 0.02C, fully charged;
4th step, second time high temperature is shelved, and under 45 �� 3 DEG C of environment, shelves 50 hours;
5th step, constant current is charging in limited time, and it is 2.5V, 0.5C constant current charge that battery carries out 0.5C constant-current discharge to stopping potential, limits the constant current charge time at 108 minutes, accounts for the 90% of rated capacity, and the capacity being charged into is 9Ah, and the capacity being charged into is labeled as C1;
6th step, normal temperature shelf, shelves 40 days under battery normal temperature 23 �� 3 DEG C of environment;
7th step, self-discharge rate calculates, carrying out 0.5C constant-current discharge stopping potential after battery normal temperature shelf is that 2.5V, 0.5C constant current charge is to 3.65V, turn 3.65V constant voltage charge to electric current < 0.02C, 0.5C constant-current discharge to stopping potential is that 2.5V, 0.5C constant current charge is to 3.65V, turning 3.65V constant voltage charge to electric current < 0.02C, this step first time loading capacity is labeled as C2,This step second time loading capacity is labeled as C3, self-discharge rate ��=(C1-C2)/C1�� 100%. The battery of �� value > 3% is the battery that self-discharge is big, and degradation uses. With C3The capacity that capacity is battery divides shelves foundation. The battery of �� value��3% and �� �ǡ�1% carries out combo and combinationally uses.
Embodiment 2
4.5Ah nickle cobalt lithium manganate self-discharge of battery screening combo, concrete steps are as follows:
The first step, small area analysis is melted into, and constant current 0.1C charges 4 hours, then constant current 0.2C charging 2h chemical conversion;
2nd step, high temperature is shelved for the first time, and 40 �� 3 DEG C of high temperature shelve 20 hours;
3rd step, charge-discharge test, battery 0.3C constant current charge is to 4.2V, turn 4.2V constant voltage charge to electric current < 0.02C, shelve 5 minute after, 0.3C constant-current discharge, to voltage 2.5V, carries out 2 discharge and recharges, finally with 0.3C constant current charge to 4.2V, turn 4.2V constant voltage charge to electric current < 0.02C, fully charged;
4th step, second time high temperature is shelved, and under 45 �� 3 DEG C of environment, shelves 48 hours;
5th step, constant current is charging in limited time, and it is 2.75V, 0.3C constant current charge that battery carries out 0.3C constant-current discharge to stopping potential, limits the constant current charge time at 170 minutes, accounts for the 85% of rated capacity, and the capacity being charged into is 3.825Ah, and the capacity being charged into is labeled as C1;
6th step, normal temperature shelf, shelves 30 days under battery normal temperature 23 �� 3 DEG C of environment;
7th step, self-discharge rate calculates, carrying out 0.3C constant-current discharge stopping potential after battery normal temperature shelf is that 2.75V, 0.3C constant current charge is to 4.2V, turn 4.2V constant voltage charge to electric current < 0.02C, 0.3C constant-current discharge to stopping potential is that 2.75V, 0.3C constant current charge is to 4.2V, turning 4.2V constant voltage charge to electric current < 0.02C, this step first time loading capacity is labeled as C2,This step second time loading capacity is labeled as C3, self-discharge rate ��=(C1-C2)/C1�� 100%. The battery of �� value > 3% is the battery that self-discharge is big, and degradation uses. With C3The capacity that capacity is battery divides shelves foundation. The battery of �� value��3% and �� �ǡ�1% carries out combo and combinationally uses.

Claims (6)

1. a lithium ion battery self discharge rate consistence group gas-mixing screening method, it is characterized in that: carry out after chemical conversion completes at lithium ion battery, make inside battery through convergent-divergent process by discharge and recharge, again by shelving for the first time, constant current is charged in limited time, second time is shelved, the calculating of self-discharge rate, determining battery self discharge rate and carry out classification combo and use, concrete steps are as follows:
The first step, small area analysis is melted into, and constant current 0.1C charges 4 hours, then constant current 0.2C charging 2h chemical conversion;
2nd step, first time shelves, and shelves 20 ~ 30 hours for 40 �� 3 DEG C;
3rd step, charge-discharge test, battery 0.2C ~ 1C constant-current constant-voltage charging, constant-current discharge, carry out 2 ~ 4 discharge and recharges, and last 0.2C ~ 1C constant current constant voltage is fully charged;
4th step, second time is shelved, and under 45 �� 3 DEG C of environment, shelves 48 hours ~ 72 hours;
5th step, constant current is charging in limited time, battery is carried out 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant current charge, and the time that limits, between 50 minutes ~ 285 minutes, is as the criterion to be charged into the 85 ~ 95% of rated capacity, and the capacity being charged into is labeled as C1;
6th step, second time is shelved, and shelves 30 ~ 50 days under battery 23 �� 3 DEG C of environment;
7th step, self-discharge rate calculates, and battery second time carries out 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant-current constant-voltage charging, 0.2C ~ 1C constant-current discharge, 0.2C ~ 1C constant-current constant-voltage charging after shelving, and this step first time loading capacity is labeled as C2,This step second time loading capacity is labeled as C3, self-discharge rate ��=(C1-C2)/C1��100%��
2. a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method according to claim 1, is characterized in that: described lithium ion battery is ferric phosphate lithium cell, nickle cobalt lithium manganate battery, nickel cobalt lithium aluminate battery or lithium manganate battery.
3. a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method according to claim 1 or 2, it is characterized in that: ferric phosphate lithium cell constant-current constant-voltage charging stopping potential is 3.65V, constant-current discharge stopping potential is 2.5V, nickel-cobalt-manganese ternary battery, nickel cobalt aluminium ternary battery, lithium manganate battery constant-current constant-voltage charging stopping potential are 4.2V, and constant-current discharge stopping potential is 2.75V.
4. a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method according to claim 3, is characterized in that: described self-discharge rate �ǡ�3%, self-discharge rate difference DELTA �ǡ�1% of same Battery pack in combo process.
5. a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method according to claim 4, is characterized in that: described C3For reference value when capacity divides grade.
6. a kind of lithium ion battery self discharge rate consistence group gas-mixing screening method according to claim 5, is characterized in that: 10Ah self discharge of lithium iron phosphate battery screening combo, and concrete steps are as follows:
The first step, small area analysis is melted into, and constant current 0.1C charges 4 hours, then constant current 0.2C charging 2h chemical conversion;
2nd step, high temperature is shelved for the first time, and 40 �� 3 DEG C of high temperature shelve 24 hours;
3rd step, charge-discharge test, battery 0.5C constant current charge is to 3.65V, turn 3.65V constant voltage charge to electric current < 0.02C, shelve 5 minute after, 0.5C constant-current discharge, to voltage 2.5V, carries out 3 discharge and recharges, finally with 0.5C constant current charge to 3.65V, turn 3.65V constant voltage charge to electric current < 0.02C, fully charged;
4th step, second time high temperature is shelved, and under 45 �� 3 DEG C of environment, shelves 50 hours;
5th step, constant current is charging in limited time, and it is 2.5V, 0.5C constant current charge that battery carries out 0.5C constant-current discharge to stopping potential, limits the constant current charge time at 108 minutes, accounts for the 90% of rated capacity, and the capacity being charged into is 9Ah, and the capacity being charged into is labeled as C1;
6th step, normal temperature shelf, shelves 40 days under battery normal temperature 23 �� 3 DEG C of environment;
7th step, self-discharge rate calculates, carrying out 0.5C constant-current discharge stopping potential after battery normal temperature shelf is that 2.5V, 0.5C constant current charge is to 3.65V, turn 3.65V constant voltage charge to electric current < 0.02C, 0.5C constant-current discharge to stopping potential is that 2.5V, 0.5C constant current charge is to 3.65V, turning 3.65V constant voltage charge to electric current < 0.02C, this step first time loading capacity is labeled as C2,This step second time loading capacity is labeled as C3, self-discharge rate ��=(C1-C2)/C1The battery of �� 100%, �� value > 3% is the battery that self-discharge is big, and degradation uses, with C3The capacity that capacity is battery divides shelves foundation, and the battery of �� value��3% and �� �ǡ�1% carries out combo and combinationally uses.
CN201511015548.4A 2015-12-30 2015-12-30 A kind of lithium ion battery self discharge rate uniformity group gas-mixing screening method CN105633472B (en)

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