CN103513186A - Method for testing self-discharge of lithium ion battery - Google Patents
Method for testing self-discharge of lithium ion battery Download PDFInfo
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- CN103513186A CN103513186A CN201310304521.1A CN201310304521A CN103513186A CN 103513186 A CN103513186 A CN 103513186A CN 201310304521 A CN201310304521 A CN 201310304521A CN 103513186 A CN103513186 A CN 103513186A
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Abstract
The invention relates to the field of lithium ion battery testing, and discloses a method for testing the self-discharge rate of a lithium ion battery. The method can test and select the lithium ion battery in a short time, namely, the self-discharge rate of the battery can be judged based on the principle that a micro short-circuit current of the self-discharge battery can generate the magnetic induction by testing the difference of the magnetic induction intensity through a teslameter or a gauss meter.
Description
Technical field
The present invention relates to lithium battery and measure field, relate in particular to a kind of lithium ion battery method of testing.
Background technology
Lithium battery is a kind of energy being most widely used at present.It has lightweight, and capacity is high, environmental protection, and the advantage that self discharge is little, is widely used in the fields such as mobile phone, portable digital product, electric motor car, UPS standby power supply.
Self discharge size, to weigh important indicator of lithium ion battery, due to the inner slight short circuit of battery itself cause battery every day with the electric current of milliampere level in self discharge, make battery capacity invisible in loss, when serious, in 7 days, can allow battery capacity conservation rate be reduced to below 20%, and normal value is 1-2%.If the battery that self discharge is large does not test out rapidly, can cause product short service time, shut down without reason, affect user job efficiency.
To the way of lithium battery self discharge test, be at present battery to be full of to electricity shelve 7 days test battery voltage then above, voltage drop is fast, and to be judged as self discharge large.But because although some battery self discharge is large, voltage remains unchanged for a long time, ferric phosphate lithium cell for example, thus cannot judge self discharge size by its voltage.And the method length consuming time, delay the product turnaround time, take a large amount of places, labor intensive material resources are too many, need to invent the self discharge degree that a kind of efficient new method judges lithium ion battery again.
Summary of the invention
It is a kind of easy rapidly that the embodiment of the present invention provides, and principle is simply tested the method for lithium ion battery self discharge size.
Due to battery operated principle, be electronics migration back and forth between both positive and negative polarity, during electric discharge, the lithium ion of negative pole moves to positive pole, produces ion migration, and negative pole has electronics to add to positive pole simultaneously, keeps charged balance, generation current.Therefore, when battery works, battery is by both positive and negative polarity, to produce loop to pass through electric current, the voltage of test both positive and negative polarity or the discharge condition that strength of current can be known battery, when battery is not worked, when namely both positive and negative polarity disconnects, the self discharge electric current of battery itself is without both positive and negative polarity, namely cannot obtain the information whether battery is discharging by voltage or the strength of current of test both positive and negative polarity, the internal path of itself may spread all over any point or the multiple spot of battery, exists uncertain.As shown in Figure 1, suppose battery there is the self discharge passage of inside battery in this near A point, for any a slice negative pole of battery, the electrons in the region beyond A point converges by this point and flows to positive pole, according to electromagnetic induction principle and Maxwell equation, near A point, will form the using beam of magnetic line of force of larger intensity, when the instrument of use test magnetic induction density is during as Te Lasi meter or gaussmeter test, in this point energy side to there is the magnetic induction density value of several times intensity compared with other regions.As shown in Figure 1, by the probe of mobile test instrument, can find fast the A point that magnetic induction density is high, utilize the peak value lock function of instrument automatically to measure maximum magnetic induction density, magnetic induction density contrast with normal battery, can judge self-discharge of battery degree size.
accompanying drawing explanation
Fig. 1 is principle of work schematic diagram of the present invention
By following relationship, obtain self-discharge of battery maximum current: I=2 α π Bf (x)/μ, wherein B is magnetic induction intensity maximal value, and x is measuring point and probe distance, and μ is permeability of vacuum constant, α is correction factor, and this correction factor is actual measuring by experiment.
The technical scheme above embodiment of the present invention being provided is described in detail, applied specific case herein the principle of the embodiment of the present invention and embodiment are set forth, the explanation of above embodiment is only applicable to help to understand the principle of the embodiment of the present invention; Simultaneously, for one of ordinary skill in the art, according to the embodiment of the present invention, in embodiment and range of application, all will change, such as being applied to ferrous phosphate battery or traditional dry cell, this description should not be construed as limitation of the present invention.
Claims (2)
1. a method of testing for lithium ion battery self discharge, is characterized in that comprising the steps:
(1) lithium ion battery to be measured is full of to electricity;
(2) utilize the magnetic induction intensity on Te Lasi meter or gaussmeter test battery surface to change;
(3) utilize instrument peak value lock function, measure magnetic induction intensity maximal value (B;
(4) obtain a result: the self-discharge of battery degree that magnetic induction density peak value is high is large.
2. the method for testing of lithium ion battery self discharge according to claim 1, it is characterized in that in step (4): self-discharge of battery maximum current obtains by following relationship: I=2 α π Bf (x)/μ, wherein B is magnetic induction intensity maximal value, x is measuring point and probe distance, μ is permeability of vacuum constant, and α is correction factor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310304521.1A CN103513186A (en) | 2013-07-19 | 2013-07-19 | Method for testing self-discharge of lithium ion battery |
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| CN201310304521.1A CN103513186A (en) | 2013-07-19 | 2013-07-19 | Method for testing self-discharge of lithium ion battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107275690A (en) * | 2017-05-23 | 2017-10-20 | 超威电源有限公司 | A kind of battery self discharge quick determination method |
| CN111722129A (en) * | 2020-06-01 | 2020-09-29 | 国联汽车动力电池研究院有限责任公司 | Battery micro short circuit detection method and system |
| CN111751737A (en) * | 2020-07-07 | 2020-10-09 | 安徽江淮汽车集团股份有限公司 | Self-discharge current calculation method, device and equipment of power battery and storage medium |
| CN115951221A (en) * | 2022-01-04 | 2023-04-11 | 国仪量子(合肥)技术有限公司 | Detection method and detection equipment for battery pack leakage discharge performance |
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| 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 |
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| CN101685142A (en) * | 2008-09-26 | 2010-03-31 | 通用汽车环球科技运作公司 | System and method to determine the state of charge of a battery using magnetostriction to detect magnetic response of battery material |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107275690A (en) * | 2017-05-23 | 2017-10-20 | 超威电源有限公司 | A kind of battery self discharge quick determination method |
| CN107275690B (en) * | 2017-05-23 | 2019-07-09 | 超威电源有限公司 | A kind of battery self discharge rapid detection method |
| CN111722129A (en) * | 2020-06-01 | 2020-09-29 | 国联汽车动力电池研究院有限责任公司 | Battery micro short circuit detection method and system |
| CN111722129B (en) * | 2020-06-01 | 2023-08-15 | 国联汽车动力电池研究院有限责任公司 | Battery micro-short circuit detection method and system |
| CN111751737A (en) * | 2020-07-07 | 2020-10-09 | 安徽江淮汽车集团股份有限公司 | Self-discharge current calculation method, device and equipment of power battery and storage medium |
| CN111751737B (en) * | 2020-07-07 | 2021-10-01 | 安徽江淮汽车集团股份有限公司 | Self-discharge current calculation method, device and equipment of power battery and storage medium |
| CN115951221A (en) * | 2022-01-04 | 2023-04-11 | 国仪量子(合肥)技术有限公司 | Detection method and detection equipment for battery pack leakage discharge performance |
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Application publication date: 20140115 |