CN102901932B - Process for detecting self-discharge of lithium batteries - Google Patents
Process for detecting self-discharge of lithium batteries Download PDFInfo
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- CN102901932B CN102901932B CN201210362143.8A CN201210362143A CN102901932B CN 102901932 B CN102901932 B CN 102901932B CN 201210362143 A CN201210362143 A CN 201210362143A CN 102901932 B CN102901932 B CN 102901932B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012216 screening Methods 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000005259 measurement 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
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The invention discloses a process for detecting self-discharge of lithium batteries. The process particularly comprises the following steps that lithium batteries to be detected and a standard lithium battery with known self-discharge rate are fully charged and parallelly connected for standing; and flow-in current flowing from the standard lithium battery to each lithium battery to be detected is respectively recorded through an ampere meter, and the lithium batteries with large self-discharging are selected out through the flow-in current. By means of the simple and quick method, the lithium batteries with large self-discharging can be selected out before being assembled into a pack, influence on consistency of the whole pack of the batteries caused by the lithium batteries with large self-discharging can be avoided, performance of a battery pack is improved, and service life of the batteries is prolonged.
Description
Technical field
The present invention relates to technical field of lithium ion, particularly a kind of screening technique of lithium battery self discharge.
Background technology
Accumulator and primary element, in there is no external discharge loop, there will be the phenomenon that terminal voltage reduces, available power is lost, and are called self discharge.Due to 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 battery excessive self-discharge rate to pick out, as off standard processing.
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 to electricity at normal temperature, be then placed in magnetic field generator, environment temperature is adjusted to 45 to 55 degrees Celsius, places 1 to 15 day, take out, and demagnetization, normal temperature supplements 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 lasting hot environment need to be paid very high cost.Patent 201110031739.5 proposes a kind of method, and normal temperature is full of electricity by constant current constant voltage mode by battery, records C1, places 1 to 6 day, then uses the same method and be full of electricity, 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 the time of standard from 28 days, although there is no the too large pressure of environment and testing cost, measuring accuracy but declines greatly, and the time is shorter, and fiduciary level is just lower.Therefore, be necessary to invent a kind of screening technique of simple and quick self-discharge of battery, 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 object of this invention is to provide a kind of screening technique of lithium battery 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 screening technique for lithium battery self discharge, is characterized in that, specifically comprises the following steps:
(1) the standard lithium battery of lithium battery to be measured (capacity is C) and known moon self-discharge rate (x%) is full of to electricity, parallel with one another, the lithium battery group after parallel connection leaves standstill 30-50 hour under stable environment;
(2) disconnect being connected in parallel between lithium battery anode, with the positive pole of reometer successively connection standard lithium battery and each lithium battery to be measured, measure and record the inflow current I that flows to each lithium battery to be measured from standard lithium battery
n, n=1,2,3...;
(3) by the inflow current I of lithium battery to be measured
nand capacity C can be calculated its month self-discharge rate y
n%=x%+28 × 24 × I
n/ C;
(4) according to producing or the requirement of combo to lithium battery self discharge and the self-discharge rate y of lithium battery to be measured
n%, filters out the lithium battery that self discharge is large.
The specifications and models of described standard lithium battery are identical with lithium battery to be measured, and the moon self-discharge rate (x%) of standard lithium battery is in the normal self-discharge rate scope of lithium battery.
Parallel way between described lithium battery is a kind of connected mode of dismountable activity.
The range of described reometer is measured current value with the maximum of surveyed lithium battery and is mated.
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, theoretic self discharge electric current I x=x% × C/ (28 × 24).
In the screening technique of lithium battery self discharge of the present invention, due to cell parallel and in quasistatic, can think that the SOC of the interior all lithium batteries to be measured of group and standard lithium battery is consistent.Therefore the inflow current that can meter basis of calculationJi lithium battery flows to each lithium battery to be measured judges the self discharge of lithium battery.The inflow current of lithium battery to be measured, can calculate with above-mentioned formula according to the self-discharge rate of standard and lithium battery to be measured.The lithium battery to be measured that self discharge is large, its theoretical self discharge electric current is larger, and therefore flowing to the inflow current of lithium battery to be measured from standard lithium battery also can be larger.
Advantage of the present invention is:
The present invention measures the inflow current between mesuring battary and standard cell by after in parallel, can calculate simply and easily the self-discharge rate of mesuring battary, excessive self discharge battery was chosen before in groups, can avoid it to affect the consistance of whole Battery pack, improve battery performance, extending battery life.
Brief description of the drawings
Fig. 1 is the connection layout of electric current between measurement standard battery and mesuring battary after cell parallel balance.
Number in the figure: 1 is reometer, 2 is switch, and 3 is standard cell, and 4 is mesuring battary.
Embodiment
Embodiment 1
Choose preparing the abnormal battery of self-discharge rate in the battery of 3.2V10Ah that combo is 48V10Ah battery of electric bicycle group.
A screening technique for lithium battery self discharge, specifically comprises the following steps:
First the standard lithium battery 3 of same model and lithium battery to be measured 4 are full of to electricity, are connected in parallel, in workshop indoor leave standstill 40 hours; The moon self-discharge rate of known selected standard lithium battery 3 is 3%, and self discharge electric current is 0.45mA; Selection milliammeter 1 (range 2mA, precision 0.001mA) flows to the electric current of lithium battery to be measured with wire 2 connections measurement standard lithium battery, calculate the inflow current of each lithium battery to be measured.
Inflow current is the lithium battery to be measured of 0.3mA, and calculating its month self-discharge rate is 5%, belongs to normal battery.And inflow current value is greater than to the lithium battery to be measured of 1.0mA, and calculate its month self-discharge rate and exceed 10%, can be judged as the abnormal battery of self discharge.Can the abnormal mesuring battary of self discharge will be selected by inflow current value according to above way.
Claims (4)
1. a screening technique for lithium battery self discharge, is characterized in that, specifically comprises the following steps:
(1) the standard lithium battery that is x% by lithium battery to be measured and known month self-discharge rate is full of electricity, and parallel with one another, the lithium battery group after parallel connection leaves standstill 30-50 hour under stable environment, and wherein the electric capacity of lithium battery to be measured is C;
(2) disconnect being connected in parallel between lithium battery anode, with the positive pole of reometer successively connection standard lithium battery and each lithium battery to be measured, measure and record the inflow current that flows to each lithium battery to be measured from standard lithium battery
, n=1,2,3...;
(3) by the inflow current of lithium battery to be measured
and electric capacity C can calculate its month self-discharge rate
;
(4) according to producing or the requirement of combo to lithium battery self discharge and the self-discharge rate of lithium battery to be measured
, filter out the lithium battery that self discharge is large.
2. the screening technique of lithium battery self discharge according to claim 1, is characterized in that: the specifications and models of described standard lithium battery are identical with lithium battery to be measured, and the moon self-discharge rate x% of standard lithium battery is in the normal self-discharge rate scope of lithium battery.
3. the screening technique of lithium battery self discharge according to claim 1, is characterized in that: the connected mode that the parallel way between described lithium battery is a kind of dismountable activity.
4. the screening technique of lithium battery self discharge according to claim 1, is characterized in that: the range of described reometer is measured current value with the maximum of surveyed lithium battery and mated.
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| CN201210362143.8A CN102901932B (en) | 2012-09-24 | 2012-09-24 | Process for detecting self-discharge of lithium batteries |
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| CN201210362143.8A CN102901932B (en) | 2012-09-24 | 2012-09-24 | Process for detecting self-discharge of lithium batteries |
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| CN102901932B true CN102901932B (en) | 2014-11-12 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105244976A (en) * | 2015-11-14 | 2016-01-13 | 深圳市格瑞普电池有限公司 | Method and device of self-discharge storage |
| CN105527583B (en) * | 2016-02-05 | 2018-08-03 | 华霆（常州）动力技术有限公司 | Battery pack self discharge detection method, battery controller and system |
| JP6907790B2 (en) * | 2017-08-07 | 2021-07-21 | トヨタ自動車株式会社 | Inspection method and manufacturing method of power 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 |
| CN109877064B (en) * | 2019-01-16 | 2021-06-22 | 上海理工大学 | Method for rapidly screening self-discharge of parallel batteries |
| CN112858922A (en) * | 2021-02-06 | 2021-05-28 | 苏州酷卡环保科技有限公司 | Performance detection method of lithium ion battery |
| CN116783498A (en) * | 2021-10-11 | 2023-09-19 | 宁德时代新能源科技股份有限公司 | Battery self-discharge detection method, circuit and equipment |
| CN115856677A (en) * | 2023-03-03 | 2023-03-28 | 宁德时代新能源科技股份有限公司 | Battery self-discharge detection method and device, electronic equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6789026B2 (en) * | 2002-12-29 | 2004-09-07 | Texas Instruments Incorporated | Circuit and method for monitoring battery state of charge |
| CN102109580A (en) * | 2011-01-30 | 2011-06-29 | 白科 | Process for detecting self discharge of lithium iron phosphate battery |
| CN102303023A (en) * | 2011-07-22 | 2012-01-04 | 万向电动汽车有限公司 | Method for detecting and sorting self-discharge performance of lithium iron phosphate battery |
| 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 |
| CN102636755A (en) * | 2011-11-16 | 2012-08-15 | 李然 | Quick measurement method for charge retention capability of battery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002343446A (en) * | 2001-05-17 | 2002-11-29 | Toyota Motor Corp | Method for measuring amount of self-discharge of lithium ion secondary battery |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6789026B2 (en) * | 2002-12-29 | 2004-09-07 | Texas Instruments Incorporated | Circuit and method for monitoring battery state of charge |
| CN102109580A (en) * | 2011-01-30 | 2011-06-29 | 白科 | Process for detecting self discharge of lithium iron phosphate battery |
| CN102303023A (en) * | 2011-07-22 | 2012-01-04 | 万向电动汽车有限公司 | Method for detecting and sorting self-discharge performance of lithium iron phosphate battery |
| CN102636755A (en) * | 2011-11-16 | 2012-08-15 | 李然 | Quick measurement method for charge retention capability of battery |
| 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 |
|---|
| JP特开2002-343446A 2002.11.29 * |
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