CN109482521A - Improve the self discharge screening technique of lithium ion battery combo consistency - Google Patents
Improve the self discharge screening technique of lithium ion battery combo consistency Download PDFInfo
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- CN109482521A CN109482521A CN201811274821.9A CN201811274821A CN109482521A CN 109482521 A CN109482521 A CN 109482521A CN 201811274821 A CN201811274821 A CN 201811274821A CN 109482521 A CN109482521 A CN 109482521A
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- 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
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- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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Abstract
The invention discloses a kind of self discharge screening technique for improving lithium ion battery combo consistency, this method follows these steps to carry out: with a batch battery after conventional partial volume, being filled with 5~20%SOC charging state electricity using 4~6A electric current constant current charging method.After battery shelves 24~48h at normal temperature, measurement cell voltage is OCV1,120~168h is shelved under the conditions of going to 45 ° again, then measurement cell voltage is OCV2, then battery is shelved under normal temperature conditions, the cell voltage measured again is OCV3, compare OCV1, OCV2, OCV3 numerical value, calculate voltage difference △ V1=OCV1-OCV2, △ V2=OCV2-OCV3 sets the overproof value code name of △ V1 as VO1, and the overproof value code name of △ V2 is VO2, the overproof battery of a batch is first eliminated with VO1 setting value coarse elutriation, after with VO2 setting value, essence eliminates a collection of battery again.The present invention is easy to implement, and combo precision is high, consistency is good, and combo is high-efficient, is particularly suitable for mass production applications.
Description
Technical field
The invention belongs to electrochemical technology fields, in particular it relates to which a kind of lithium ion battery, is especially improved
The self discharge screening technique of lithium ion battery combo consistency.
Background technique
Lithium ion battery is the energy storaging product that a kind of specific energy is high, self discharge is low and high-low pressure performance is good, it is by widely
The equipment such as mating modern office equipment, communication equipment and electric tool.In reality, lithium ion battery is usually by several monomer electricity
Chi Jing goes here and there or is connected in parallel, and the industry is commonly called as combo.But the battery of combo connection has " bucket effect ", i.e. battery
Group performance is determined by worst single battery.Therefore, the almost the same single battery of screenability is the key that battery combo ring
An important process before section and the shipment of lithium ion battery manufacturer.Currently, the industry generallys use measurement battery open circuit electricity
Pressure or open-circuit voltage drop, objectively respond self-discharge of battery size with this.The method is simple, intuitive, can reach the mesh of screening
's.But the method screening precision is not high, low efficiency, is not on the one hand able to satisfy the mating requirement of sophisticated equipment, on the other hand
Be not suitable for mass production applications.
Summary of the invention
It present invention is generally directed to the deficiencies in the prior art, proposes that a kind of method is simple, implements to be easy, screening efficiency is high, matches
The self discharge screening technique of the good raising lithium ion battery combo consistency of group precision, lithium ion can be significantly reduced by implementing this method
Battery manufacturers shipment risk.
The present invention is achieved through the following technical solutions technical goal.
The self discharge screening technique for improving lithium ion battery combo consistency, thes improvement is that this method by following step
It is rapid to carry out:
1.1 charging
After being handled with a batch battery through conventional partial volume, 4~6A electric current constant current charging method is respectively adopted and is filled with 5~20%SOC lotus
Electric state electricity.
1.2 alternatings are shelved and voltage measurement
24~48h is shelved under the conditions of 20~30 DEG C, measuring cell voltage at that time is OCV1, then is shelved under the conditions of going to 45 DEG C
120~168h, then measuring cell voltage is OCV2, battery is then shelved 120~168h under the conditions of 20~30 DEG C, again
The cell voltage of measurement is OCV3.
1.3 screening batteries
Cell voltage OCV1, OCV2 and OCV3 numerical value for comparing different phase measurement, calculates separately out voltage difference △ V1 and △ V2,
△ V1=OCV1-OCV2, △ V2=OCV2-OCV3, sets the overproof value code name of voltage difference △ V1 as V01, the overproof value generation of △ V2
Number be V02, the overproof battery of a batch first eliminated with V01 setting value coarse elutriation, after with V02 setting value, essence eliminates a collection of battery again.
As the scheme of further improvement, the overproof value V01 of the voltage difference △ V1 is 40~50mV；The voltage difference △ V2
Overproof value V02 be 8~10mV.
Compared with prior art, the present invention having the positive effect that:
1, battery is shelved respectively under different temperatures regulations, and self discharge is abundant, and measurement cell voltage is accurate, reliable；
2, battery is screened by different settings in two steps, therefore combo precision is high, battery consistency is good；
3, it is easy to implement this method, it is at most 16 days time-consuming, half the time is saved than the prior art, therefore combo is high-efficient.
Detailed description of the invention
Fig. 1 is using the process capability report of present invention front and back battery pack Pressure difference distribution, and the figure upper half shows the present invention's
Preceding state, figure lower half show state after the present invention.
Specific embodiment
The present invention is further illustrated below by embodiment.
In order to advanced optimize battery combo quality, the present invention provide it is a kind of improve lithium ion battery combo consistency from
Discharge screening technique, and this method follows these steps to carry out:
1.1 charging
The present embodiment takes 1250, family IFP2083200-020 lithium ion battery altogether, this batch of battery handles it through conventional partial volume
Afterwards, unified to be filled with 5%SOC charging state electricity with 4A electric current constant current charging method.
1.2 alternatings are shelved and voltage measurement
It is shelved for 24 hours under the conditions of 25 DEG C ± 3 DEG C, measuring cell voltage at that time is OCV1, then is shelved under the conditions of going to 45 DEG C ± 1 DEG C
168h, then measuring cell voltage is OCV2, battery is then shelved 168h under the conditions of 25 DEG C ± 3 DEG C, the electricity measured again
Cell voltage is OCV3.
1.3 screening batteries
Cell voltage OCV1, OCV2 and OCV3 numerical value for comparing different phase measurement, calculates separately out voltage difference △ V1 and △ V2,
△ V1=OCV1-OCV2, △ V2=OCV2-OCV3, sets the overproof value code name of voltage difference △ V1 as V01, the overproof value generation of △ V2
Number be V02, the present embodiment set V01=40mV, V02=8mV.△ V1 is calculated after measuring OCV2, is first with V01=40mV
Eliminate the overproof battery of a batch in boundary.Through this coarse sizing and then make fine screen choosing, fine screen is selected in after measurement OCV3, passes through
△ V2 is calculated, eliminates the overproof battery of a batch again as boundary by the V02=8mV set.Because V02 setting value is smaller, therefore it is referred to as essence
Screening.
It is selected by above-mentioned coarse sizing and fine screen, behindhand battery therein will be mixed in and eliminated, the present embodiment is by remaining electricity
Pond forms 48V battery system.Then by Pressure difference distribution situation between single battery in normal flow detection and analysis battery pack, specifically
Pressure difference distribution situation is shown in the lower half Fig. 1, and the present embodiment Pressure difference distribution CpK and standard are close.And battery pack of the invention is not applied
Pressure difference CpK is 1.259 between interior single battery, and Pressure difference distribution CpK as defined in standard is 1.94884, and the two gap is larger, specific to press
Poor distribution situation is shown in the upper half Fig. 1.
The present invention is shelved a stage respectively by the way that battery to be placed under condition of different temperatures, and purpose allows battery sufficiently to put certainly
Electricity accomplishes to measure cell voltage accurately, reliably.On the other hand battery is screened by different settings in two steps, therefore screens precision
Height, battery combo consistency are good.In addition, the present invention is easy to implement, and it is at most 16 days time-consuming, half the time is saved than the prior art,
Therefore combo is high-efficient, is particularly suitable for mass production applications.
Claims (2)
1. a kind of self discharge screening technique for improving lithium ion battery combo consistency, it is characterised in that this method follows these steps
It carries out:
1.1 charging
After being handled with a batch battery through conventional partial volume, 4~6A electric current constant current charging method is respectively adopted and is filled with 5~20%SOC lotus
Electric state electricity；
1.2 alternatings are shelved and voltage measurement
24~48h is shelved under the conditions of 20~30 DEG C, measuring cell voltage at that time is OCV1, then is shelved under the conditions of going to 45 DEG C
120~168h, then measuring cell voltage is OCV2, battery is then shelved 120~168h under the conditions of 20~30 DEG C, again
The cell voltage of measurement is OCV3；
1.3 screening batteries
Cell voltage OCV1, OCV2 and OCV3 numerical value for comparing different phase measurement, calculates separately out voltage difference △ V1 and △ V2,
△ V1=OCV1-OCV2, △ V2=OCV2-OCV3, sets the overproof value code name of voltage difference △ V1 as V01, the overproof value generation of △ V2
Number be V02, the overproof battery of a batch first eliminated with V01 setting value coarse elutriation, after with V02 setting value, essence eliminates a collection of battery again.
2. the self discharge screening technique according to claim 1 for improving lithium ion battery combo consistency, it is characterised in that:
The overproof value V01 of the voltage difference △ V1 is 40~50mV；The overproof value V02 of the voltage difference △ V2 is 8~10mV.
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| CN201811274821.9A CN109482521A (en) | 2018-10-30 | 2018-10-30 | Improve the self discharge screening technique of lithium ion battery combo consistency |
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| CN201811274821.9A CN109482521A (en) | 2018-10-30 | 2018-10-30 | Improve the self discharge screening technique of lithium ion battery combo consistency |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221227A (en) * | 2019-05-31 | 2019-09-10 | 上海动力储能电池系统工程技术有限公司 | Single battery state consistency evaluating method in battery modules |
| CN110639844A (en) * | 2019-08-26 | 2020-01-03 | 上海空间电源研究所 | Lithium ion storage battery consistency screening method for space aircraft |
| CN111063951A (en) * | 2019-11-19 | 2020-04-24 | 安徽益佳通电池有限公司 | Method for screening and matching self-discharge of lithium ion battery |
| CN112130085A (en) * | 2020-09-09 | 2020-12-25 | 欣旺达电动汽车电池有限公司 | Screening method and device for self-discharge performance of lithium battery and computer equipment |
| CN112379283A (en) * | 2020-10-22 | 2021-02-19 | 合肥国轩高科动力能源有限公司 | Self-discharge screening method for power battery |
| CN112698227A (en) * | 2020-11-24 | 2021-04-23 | 合肥国轩高科动力能源有限公司 | Lithium ion battery self-discharge abnormity screening method |
| CN113376525A (en) * | 2021-06-15 | 2021-09-10 | 多氟多新能源科技有限公司 | Low-voltage selection method for lithium ion battery |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110221227A (en) * | 2019-05-31 | 2019-09-10 | 上海动力储能电池系统工程技术有限公司 | Single battery state consistency evaluating method in battery modules |
| CN110639844A (en) * | 2019-08-26 | 2020-01-03 | 上海空间电源研究所 | Lithium ion storage battery consistency screening method for space aircraft |
| CN110639844B (en) * | 2019-08-26 | 2022-02-01 | 上海空间电源研究所 | Lithium ion storage battery consistency screening method for space aircraft |
| CN111063951A (en) * | 2019-11-19 | 2020-04-24 | 安徽益佳通电池有限公司 | Method for screening and matching self-discharge of lithium ion battery |
| CN112130085A (en) * | 2020-09-09 | 2020-12-25 | 欣旺达电动汽车电池有限公司 | Screening method and device for self-discharge performance of lithium battery and computer equipment |
| CN112379283A (en) * | 2020-10-22 | 2021-02-19 | 合肥国轩高科动力能源有限公司 | Self-discharge screening method for power battery |
| CN112698227A (en) * | 2020-11-24 | 2021-04-23 | 合肥国轩高科动力能源有限公司 | Lithium ion battery self-discharge abnormity screening method |
| CN113376525A (en) * | 2021-06-15 | 2021-09-10 | 多氟多新能源科技有限公司 | Low-voltage selection method for lithium ion battery |
| CN113376525B (en) * | 2021-06-15 | 2024-02-23 | 多氟多新能源科技有限公司 | Low-voltage selection method for lithium ion battery |
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Application publication date: 20190319 |