CN102901931A - Method for screening lithium batteries with abnormal self discharge - Google Patents
Method for screening lithium batteries with abnormal self discharge Download PDFInfo
- Publication number
- CN102901931A CN102901931A CN201210361442XA CN201210361442A CN102901931A CN 102901931 A CN102901931 A CN 102901931A CN 201210361442X A CN201210361442X A CN 201210361442XA CN 201210361442 A CN201210361442 A CN 201210361442A CN 102901931 A CN102901931 A CN 102901931A
- Authority
- CN
- China
- Prior art keywords
- lithium battery
- self discharge
- self
- batteries
- electric current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 69
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 4
- 230000001808 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims 1
- 230000002411 adverse Effects 0.000 abstract 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium Ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 101710031899 moon Proteins 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Abstract
The invention discloses a method for screening lithium batteries with abnormal self discharge. The method comprising the following steps of: fully charging the lithium batteries and standing in parallel; measuring the current between adjacent lithium batteries with an ampere meter; and calculating net inflow current of each lithium battery, and judging whether abnormal self discharge exists according to the magnitude of the net inflow current of the battery. By adopting a simple and rapid method provided by the invention, the batteries with overlarge self charge can be screened before assembling, thereby avoiding adverse influence on the consistency of the whole set of batteries, improving the performance of a battery pack and prolonging the service life of the batteries.
Description
Technical field
The present invention relates to technical field of lithium ion, particularly a kind of method of screening the unusual lithium battery of self discharge.
Background technology
Accumulator and primary element the phenomenon that terminal voltage reduces, available power is lost can occur when not having external discharge loop, be called self discharge.Because the impact of starting material and manufacturing process, the self-discharge rate of a small amount of lithium ion battery can reach several times of normal battery, and these batteries and other battery series-parallel connections use, and can have a strong impact on the performance of whole Battery pack.Be necessary that the battery that self-discharge rate is excessive picks out, process as off standard.
The detection of self-discharge rate according to national standard, needs more than 30 days, and this has just brought very large inconvenience to operation.Patent CN201110388882.X has announced a kind of method of utilizing magnetic field to accelerate self-discharge rate.Use 0.33C that battery to be selected is full of electricity at normal temperature, then be placed in the magnetic field generator, environment temperature is adjusted to 45 to 55 degrees centigrade, places 1 to 15 day, take out, and demagnetization, normal temperature replenishes electricity, and the capacity of filling into takes the number percent of electric capacity just as self-discharge rate.Although it is over half that this method can shorten the test duration, magnetic field and the hot environment that continues need to be paid very high cost.Patent 201110031739.5 proposes a kind of method, and normal temperature is full of electricity with the constant current constant voltage mode with battery, and record C1 placed 1 to 6 day, and using the same method is full of electricity again, records C2, judges the size of the self-discharge rate of this battery by the ratio of C2 and C1.This method under same condition, shortened to 1 to 6 day to the time of standard from 28 days, although there is not the too large pressure of environment and testing cost, measuring accuracy but descends greatly, and the time is shorter, and fiduciary level is just lower.Therefore, be necessary to invent a kind of screening technique of self-discharge of battery of Simple fast, solve the difficult problem that test duration, test environment, testing cost etc. bring, and keep the reliable of test result.
Summary of the invention
The purpose of this invention is to provide a kind of method of screening the unusual lithium battery of self discharge, the present invention can pick out the excessive lithium battery of self discharge simply and easily, neither needs the oversize time, does not need again the cost of special environment and Tai Gao.
The technical solution used in the present invention is:
A kind of method of screening the unusual lithium battery of self discharge is characterized in that, specifically may further comprise the steps:
1) at first lithium battery to be measured is full of electricity, lithium battery is divided into groups, the number of the lithium battery of each lithium battery group is m, and the m of a same lithium battery group lithium battery is parallel with one another, and the lithium battery group after the parallel connection left standstill under stable environment 30-50 hour;
2) disconnect being connected in parallel between two adjacent lithium batteries (n and n+1 joint lithium battery), keep being connected in parallel between other batteries, measure the electric current of the joint lithium battery from the n throttling to n+1 with reometer, and be recorded as respectively I
An, the value of n is 1,2,3...m, wherein I
A0=I
Am=0;
3) the net inflow electric current I of each lithium battery in the calculating lithium battery group
n=I
A (n-1)-I
An, the value of n is 1,2,3...m;
4) the lithium battery self-discharge rate that the net inflow electric current is larger is higher, according to the distribution of the net inflow current value of the related request of lithium battery self discharge screening and m lithium battery, determines abnormal electrical flow valuve I;
5) in each lithium battery, the net inflow electric current I
nThe lithium battery that is higher than abnormal electrical flow valuve I is the unusual lithium battery of self discharge;
6) the unusual lithium battery of self discharge is chosen from the lithium battery group.
Parallel way between the described lithium battery is a kind of connected mode of dismountable activity.
The range of described reometer is measured the current value coupling with the maximum of the lithium battery of surveying.
Principle of the present invention is:
Lithium battery self discharge electric current is relevant with month self-discharge rate, and its computing method are, a moon self-discharge rate of establishing lithium battery is x%, and the capacity of lithium battery is C, then theoretic self discharge electric current I x=x% * C/ (28 * 24).
When the net inflow electric current that calculates or choose lithium battery and abnormal electrical flow valuve, can be take the self-discharge rate of normal and unusual lithium battery with the self discharge electric current I x of above-mentioned formula calculating as foundation.
The electric current of measuring in parallel of the present invention judges in the unusual method of self discharge, because cell parallel and be in quasistatic, can think that the SOC of all batteries is consistent in the group, and the electric current sum of the self discharge of each battery and outer discharge should equate.Therefore can measure the self discharge that the net inflow electric current that calculates each lithium battery is judged lithium battery.
Advantage of the present invention is:
The present invention can cross self discharge simply and easily macrocell and choose before in groups by measuring the net inflow electric current of batteries in parallel connection, can avoid its consistance that affects whole Battery pack, improves battery performance, extending battery life.
Description of drawings
Fig. 1 measures after the cell parallel balance connection layout of electric current between battery
1 is reometer, and 2 is switch, and 3 is mesuring battary
Embodiment
Embodiment 1
Choose preparing in the battery of 3.2V10Ah that combo is the 300V50Ah electric automobile the unusual battery of self-discharge rate.
A kind of method of screening the unusual lithium battery of self discharge specifically may further comprise the steps:
At first lithium battery to be measured 3 is full of electricity, 100 lithium battery 3 parallel connections of every group, indoor the leaving standstill 40 hours in the workshop; 3 normal months self-discharge rate average out to 5% of the lithium battery of known manufacturing, the self discharge electric current is 0.74mA, and the unusual battery self-discharge rate of self discharge is greater than 12%, unusual self-discharge of battery electric current is 1.79mA; Select milliammeter 1(range 2mA, precision 0.001mA) with wire 2 connections and measure electric current between adjacent lithium battery, calculate the net inflow electric current of each lithium battery; Known natural rate of interest is 90%, and then average self discharge electric current is 0.74 * 0.9+1.79 * 0.1=0.85mA.Month self-discharge rate is that the net inflow electric current of 5% normal battery is 0.74-0.85=-0.11mA, and the net inflow electric current of the battery of month self-discharge rate unusual (12%) is 1.79-0.85=0.95 mA.Therefore the net inflow current value is chosen as the unusual battery of self discharge greater than the battery of 0.9 mA.
Claims (3)
1. a method of screening the unusual lithium battery of self discharge is characterized in that, specifically may further comprise the steps:
(1) at first lithium battery to be measured is full of electricity, lithium battery is divided into groups, the number of the lithium battery of each lithium battery group is m, and the m of a same lithium battery group lithium battery is parallel with one another, and the lithium battery group after the parallel connection left standstill under stable environment 30-50 hour;
(2) disconnect being connected in parallel between two adjacent lithium batteries, keep being connected in parallel between other batteries, measure the electric current of the joint lithium battery from the n throttling to n+1 with reometer, and be recorded as respectively I
An, the value of n is 1,2,3...m, wherein I
A0=I
Am=0;
(3) the net inflow electric current=I of each lithium battery in the calculating lithium battery group
A (n-1)-I
An, the value of n is 1,2,3...m;
(4) larger its self-discharge rate of the net inflow electric current of lithium battery is higher, according to the requirement of lithium battery self discharge or the distribution of m lithium battery net inflow current value, determines the value of abnormal current I;
(5) in each lithium battery, the net inflow electric current I
nThe lithium battery that is higher than abnormal current I is the unusual lithium battery of self discharge;
(6) the unusual lithium battery of self discharge is chosen from the lithium battery group.
2. the screening technique of lithium battery self discharge according to claim 1, it is characterized in that: the parallel way between the described lithium battery is a kind of connected mode of dismountable activity.
3. the screening technique of lithium battery self discharge according to claim 1 is characterized in that: the maximum measurement current value coupling of the range of described reometer and the lithium battery of surveying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210361442.XA CN102901931B (en) | 2012-09-24 | 2012-09-24 | Method for screening lithium batteries with abnormal self discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210361442.XA CN102901931B (en) | 2012-09-24 | 2012-09-24 | Method for screening lithium batteries with abnormal self discharge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102901931A true CN102901931A (en) | 2013-01-30 |
| CN102901931B CN102901931B (en) | 2015-01-07 |
Family
ID=47574273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210361442.XA Active CN102901931B (en) | 2012-09-24 | 2012-09-24 | Method for screening lithium batteries with abnormal self discharge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102901931B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487757A (en) * | 2013-09-04 | 2014-01-01 | 厦门华锂能源有限公司 | Method for simulating battery self discharge rate |
| CN104237799A (en) * | 2014-09-04 | 2014-12-24 | 中天储能科技有限公司 | Method for fast judging self-discharging ratio of lithium iron phosphate battery |
| WO2016091116A1 (en) * | 2014-12-09 | 2016-06-16 | 江苏华东锂电技术研究院有限公司 | Lithium ion battery screening method |
| CN109342957A (en) * | 2018-09-26 | 2019-02-15 | 合肥国轩高科动力能源有限公司 | Fail battery detection method in the big simultaneously gang mould group of lithium ion battery self discharge |
| CN109387788A (en) * | 2017-08-07 | 2019-02-26 | 丰田自动车株式会社 | The inspection method and manufacturing method of electrical storage device |
| US10345388B2 (en) | 2014-12-08 | 2019-07-09 | Jiangsu Huadong Institute Of Li-Ion Battery Co., Ltd | Method for screening lithium ion battery |
| CN110187291A (en) * | 2019-06-10 | 2019-08-30 | 天津普兰能源科技有限公司 | Lithium ion battery self discharge fast screening devices and screening technique based on DC impedance |
| CN110935655A (en) * | 2019-11-15 | 2020-03-31 | 上海理工大学 | Self-discharge rapid screening method based on branch current change of parallel battery pack |
| WO2020147315A1 (en) * | 2019-01-16 | 2020-07-23 | 上海理工大学 | Method for rapidly screening self discharge of parallel battery |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3711076B2 (en) * | 2002-02-13 | 2005-10-26 | 関西電力株式会社 | Method for creating electrical equivalent circuit model of redox flow battery, simulation method and program using the same |
| CN101262138A (en) * | 2007-12-05 | 2008-09-10 | 奇瑞汽车股份有限公司 | Monocase balanced system for lithium ion dynamic battery |
| CN102257452A (en) * | 2008-12-18 | 2011-11-23 | 恩德莱斯和豪瑟尔过程解决方案股份公司 | Field device for determining and/or monitoring a physical or chemical process parameter |
| CN102508173A (en) * | 2011-11-30 | 2012-06-20 | 江苏富朗特新能源有限公司 | Self-discharge detection method for lithium iron phosphate batteries |
| CN102508165A (en) * | 2011-10-20 | 2012-06-20 | 合肥国轩高科动力能源有限公司 | Method for evaluating self-discharge consistency of lithium iron phosphate battery |
| CN202443112U (en) * | 2011-11-16 | 2012-09-19 | 李然 | Battery charge retention ability rapid measuring device |
| CN202443113U (en) * | 2011-11-29 | 2012-09-19 | 李革臣 | Battery self-discharge performance rapid measuring device |
-
2012
- 2012-09-24 CN CN201210361442.XA patent/CN102901931B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3711076B2 (en) * | 2002-02-13 | 2005-10-26 | 関西電力株式会社 | Method for creating electrical equivalent circuit model of redox flow battery, simulation method and program using the same |
| CN101262138A (en) * | 2007-12-05 | 2008-09-10 | 奇瑞汽车股份有限公司 | Monocase balanced system for lithium ion dynamic battery |
| CN102257452A (en) * | 2008-12-18 | 2011-11-23 | 恩德莱斯和豪瑟尔过程解决方案股份公司 | Field device for determining and/or monitoring a physical or chemical process parameter |
| CN102508165A (en) * | 2011-10-20 | 2012-06-20 | 合肥国轩高科动力能源有限公司 | Method for evaluating self-discharge consistency of lithium iron phosphate battery |
| CN202443112U (en) * | 2011-11-16 | 2012-09-19 | 李然 | Battery charge retention ability rapid measuring device |
| CN202443113U (en) * | 2011-11-29 | 2012-09-19 | 李革臣 | Battery self-discharge performance rapid measuring device |
| CN102508173A (en) * | 2011-11-30 | 2012-06-20 | 江苏富朗特新能源有限公司 | Self-discharge detection method for lithium iron phosphate batteries |
Non-Patent Citations (1)
| Title |
|---|
| 简旭宇等: "氢镍动力电池自放电一致性研究", 《电源技术》, vol. 31, no. 6, 30 June 2007 (2007-06-30) * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487757A (en) * | 2013-09-04 | 2014-01-01 | 厦门华锂能源有限公司 | Method for simulating battery self discharge rate |
| CN104237799A (en) * | 2014-09-04 | 2014-12-24 | 中天储能科技有限公司 | Method for fast judging self-discharging ratio of lithium iron phosphate battery |
| US10345388B2 (en) | 2014-12-08 | 2019-07-09 | Jiangsu Huadong Institute Of Li-Ion Battery Co., Ltd | Method for screening lithium ion battery |
| WO2016091116A1 (en) * | 2014-12-09 | 2016-06-16 | 江苏华东锂电技术研究院有限公司 | Lithium ion battery screening method |
| CN109387788A (en) * | 2017-08-07 | 2019-02-26 | 丰田自动车株式会社 | The inspection method and manufacturing method of electrical storage device |
| CN109387788B (en) * | 2017-08-07 | 2020-10-27 | 丰田自动车株式会社 | Method for inspecting electric storage device and method for manufacturing electric storage device |
| CN109342957A (en) * | 2018-09-26 | 2019-02-15 | 合肥国轩高科动力能源有限公司 | Fail battery detection method in the big simultaneously gang mould group of lithium ion battery self discharge |
| WO2020147315A1 (en) * | 2019-01-16 | 2020-07-23 | 上海理工大学 | Method for rapidly screening self discharge of parallel battery |
| CN110187291A (en) * | 2019-06-10 | 2019-08-30 | 天津普兰能源科技有限公司 | Lithium ion battery self discharge fast screening devices and screening technique based on DC impedance |
| CN110187291B (en) * | 2019-06-10 | 2021-10-22 | 天津普兰能源科技有限公司 | Lithium ion battery self-discharge rapid screening device and screening method based on direct-current impedance |
| CN110935655A (en) * | 2019-11-15 | 2020-03-31 | 上海理工大学 | Self-discharge rapid screening method based on branch current change of parallel battery pack |
| CN110935655B (en) * | 2019-11-15 | 2021-12-14 | 上海理工大学 | Self-discharge rapid screening method based on branch current change of parallel battery pack |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102901931B (en) | 2015-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102901931B (en) | Method for screening lithium batteries with abnormal self discharge | |
| CN102901932B (en) | Process for detecting self-discharge of lithium batteries | |
| CN104062594B (en) | Lithium-ion-power cell method for group matching | |
| CN106199479B (en) | Battery module of electric vehicle BMS detection accuracy calibrating installation and method | |
| CN103178306B (en) | Equilibrium assembling method and equilibrium assembling system for lithium secondary battery | |
| CN103316852B (en) | Battery selecting method | |
| CN104617339B (en) | Lithium ion battery group matching method | |
| CN107852013A (en) | Capacity in the lithium-sulfur cell of monitoring and balance arranged in series | |
| CN103048623B (en) | A kind of method of quick detection self discharge rate of lithium iron phosphate lithium-ion battery | |
| CN104084383A (en) | Self-discharge sorting process for lithium iron phosphate batteries | |
| CN102074757A (en) | Method for estimating charge states of lithium ion battery | |
| CN107247235A (en) | A kind of battery capacity evaluation method for considering batteries in parallel connection difference | |
| CN105866701B (en) | A kind of sodium-sulphur battery consistency detecting method | |
| CN103235267A (en) | Method for quickly and effectively comparing self-discharge rates of batteries | |
| CN104577226B (en) | A kind of method for group matching improving power battery pack service life cycle | |
| CN103579696A (en) | Battery assembling method | |
| CN104269574A (en) | Battery pack sorting method | |
| CN108363011A (en) | A kind of evaluation method of battery pack monomer consistency | |
| CN110261791A (en) | A kind of battery group cycle life fast appraisement method | |
| CN105738821B (en) | The accurate method for calculating battery coulombic efficiency under different temperatures | |
| CN109313235A (en) | Group battery circuit, capacity coefficient detection method and capacity coefficient detect program | |
| CN108020788A (en) | A kind of lithium ion battery internal resistance rapid screening method | |
| Aizpuru et al. | Battery pack tests to detect unbalancing effects in series connected Li-ion cells | |
| CN102456912A (en) | Lithium iron phosphate lithium ion battery as well as electricity quantity status test method and pairing method thereof | |
| CN103837829B (en) | A kind of intelligent compensation twin wire power lithium-ion battery measures system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 230011, No. 7 D Road, Yaohai Industrial Park, Hefei, Anhui, China Applicant after: Hefei Guoxuan High-Tech Power Energy Co., Ltd. Address before: 230011, No. 7 D Road, Yaohai Industrial Park, Hefei, Anhui, China Applicant before: Hefei Guoxuan High-Tech Power Energy Co., Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: HEFEI GUOXUAN HIGH-TECH POWER ENERGY CO., LTD. TO: HEFEI GUOXUAN HIGH-TECH POWER ENERGY CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 230000 Yaohai Industrial Zone, Hefei New District, Anhui, No. D weft Road, No. 7 Patentee after: Hefei Guoxuan High-Tech Power Energy Co., Ltd. Address before: 230011, No. 7 D Road, Yaohai Industrial Park, Hefei, Anhui, China Patentee before: Hefei Guoxuan High-Tech Power Energy Co., Ltd. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160627 Address after: Tiger Road Liuhe Economic Development Zone in Nanjing City, Jiangsu Province, No. 19 210000 Patentee after: NANJING GUOXUAN BATTERY CO., LTD. Address before: 230000 Yaohai Industrial Zone, Hefei New District, Anhui, No. D weft Road, No. 7 Patentee before: Hefei Guoxuan High-Tech Power Energy Co., Ltd. |