CN103272784A - Self-discharge screening method of chargable lithium battery - Google Patents
Self-discharge screening method of chargable lithium battery Download PDFInfo
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- CN103272784A CN103272784A CN201210494729XA CN201210494729A CN103272784A CN 103272784 A CN103272784 A CN 103272784A CN 201210494729X A CN201210494729X A CN 201210494729XA CN 201210494729 A CN201210494729 A CN 201210494729A CN 103272784 A CN103272784 A CN 103272784A
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Abstract
The invention discloses a self-discharge screening method of chargable lithium battery, and belongs to the field of lithium battery detection technology. The method comprises the following steps: A. using movable clamps for connecting many batteries to be tested in parallel connection for a period of time; B. fetching movable clamps, recoding the lithium battery voltage at the time, and laying the lithium battery; C. measuring the voltage of the lithium battery after laying, and calculating the voltage drop value; D. choosing the unqualified lithium battery by comparing the normal pressure drop values. The invention has the beneficial effects that the consistency of the initial voltage is substantially improved, and the reliability of simple voltage determination is substantially increased, thereby reaching the level which approaches to the automatic sieving machine, and obviously reducing the risk of battery usage; the resource investment is few, so the method is suitable for middle and small-sized enterprises to use or research.
Description
Technical field
The present invention relates to a kind of self discharge screening technique of chargeable lithium cell, belong to lithium battery detection technique field.
Background technology
Lithium battery self discharge screening is that important test item, the especially battery of chargeable lithium cell is when being used for the connection in series-parallel assembling.
Method in common mainly contains two kinds at present, all is to utilize the self discharge meeting that battery open circuit voltage is descended to judge that in the interval, voltage descends more many at one time, and the sign self discharge is more big, and undesirable level is more high.
A kind of method is to use the screening machine of semi-automatic or automation, the voltage difference that stores before and after (also claim to wear out, shelve etc.) twice by comparison is identified the excessive battery of self discharge, this method all is mapped because of twice voltage in front and back with every battery, so it is more accurate to identify, the success rate height, but needing to drop into more software and hardware resources, is a no small input to a lot of enterprises or unit.
Another kind method is the charge or discharge by the control battery, make the voltage of battery before storage consistent as far as possible, measuring voltage again after shelving, because twice voltage measuring value of every battery can not be corresponding, and the voltage before storing also can not be accomplished unanimity, its voltage pole difference in addition surpassed twice voltage difference (voltage drop value) a lot of doubly, so success rate is lower.
For the 2nd kind of method, also have flexible method to be, prolong the storage time, voltage drop value can become greatly like this, and when being enough to surpass several times of initial voltage extreme difference values, this alternative is feasible, but can increase the production cycle (generally can increase more than 10 days, and the production cycle had only about two weeks normally) and stock, operation, managing risk increased, the very big drawback of same existence.
If underproof battery is judged by accident to qualified, belong to bigger defective for battery pack, can influence life-span and the reliability of whole battery group, so, for dropping into less relatively company or unit, the battery bad with a kind of simple and easy reliable and feasible method accurate recognition self discharge is very necessary.
Summary of the invention
Technical problem to be solved by this invention is to provide at above the deficiencies in the prior art a kind of self discharge screening technique of chargeable lithium cell.
The present invention is achieved by the following technical solutions:
A, use floating holder carry out parallel connection a period of time with a plurality of batteries to be tested;
B, take off floating holder, record lithium battery voltage this moment value is shelved lithium battery;
Lithium battery voltage after C, measurement are shelved calculates the voltage drop value;
D, by more normal voltage drop value, defective lithium battery is picked out.
Further, the time of shelving of described step (B) is 2-4 days.
Further, described floating holder is detachable.
The invention has the beneficial effects as follows: (1) screens accuracy rate and use is semi-automatic or the automatically screening machine is very approaching; (2) except floating holder, do not need additionally to increase input again, the 0.1mV precision universal meter that only needs to use each enterprise to be equipped with gets final product, and floating holder can be recycled; (3) simple and easy to do, use floating holder a period of time in parallel, can remove parallel connection and store, store and finish directly measuring voltage of back, only need the voltage height is directly judged.
To sum up, because this simple and easy method has improved the uniformity of initial voltage greatly, the reliability that makes simple voltage judge significantly improves, reach the level that approaches very much with automatic screening machine, obviously reduced the risk that battery uses, and resource drops into seldom, is fit to very much the use of medium-sized and small enterprises unit or is used for research.
Description of drawings
In order to be illustrated more clearly in technical scheme of the present invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is lithium battery of the present invention schematic diagram in parallel.
The specific embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is explained in detail, the battery that carries out the self discharge screening in conjunction with Fig. 1, with needs shows that by Fig. 1 the use floating holder couples together the positive pole/negative pole of every battery respectively by parallel way.After a period of time in parallel, voltage tends towards stability, and measures the voltage of battery when in parallel this moment, and voltage is designated as OCV1.Remove the connection between every battery, lithium battery was shelved 2-4 days.
After shelving end, measure the voltage of every battery, according to existing pressure drop empirical value (or actual verification result) and the OCV1 value that recorded, calculate voltage standard (being designated as OCV2), the battery that is higher than OCV2 can be judged to be non-defective unit, the battery that is lower than OCV2 can be judged to be substandard products, also can just carry out further fine graded according to voltage.
The above person is preferred embodiment of the present invention only, is not to limit practical range of the present invention, and namely all equalizations of doing according to the present invention change and modify, and are all claim scope of the present invention and contain, and give an example no longer one by one here.
Claims (3)
1. the self discharge screening technique of a chargeable lithium cell is characterized in that:
A, use floating holder carry out parallel connection a period of time with a plurality of batteries to be tested;
B, take off floating holder, record lithium battery voltage this moment value is shelved lithium battery;
Lithium battery voltage after C, measurement are shelved calculates the voltage drop value;
D, by more normal voltage drop value, defective lithium battery is picked out.
2. the self discharge screening technique of chargeable lithium cell according to claim 1, it is characterized in that: the time of shelving of described step (B) is 2-4 days.
3. the self discharge screening technique of chargeable lithium cell according to claim 1, it is characterized in that: described floating holder is detachable.
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| CN201210494729XA CN103272784A (en) | 2012-11-28 | 2012-11-28 | Self-discharge screening method of chargable lithium battery |
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| CN201210494729XA CN103272784A (en) | 2012-11-28 | 2012-11-28 | Self-discharge screening method of chargable lithium battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387849A (en) * | 2018-04-20 | 2018-08-10 | 清华大学 | The rapid detection method and device of lithium ion battery self discharge |
| 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 |
| CN113296005A (en) * | 2021-04-25 | 2021-08-24 | 浙江超威创元实业有限公司 | Method for testing voltage drop of battery |
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| CN101764259A (en) * | 2010-01-15 | 2010-06-30 | 苏州星恒电源有限公司 | Method for group matching of power lithium-ion rechargeable battery |
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| CN102284436A (en) * | 2011-05-20 | 2011-12-21 | 青岛海霸能源集团有限公司 | Method for selecting monomer batteries before assembly of power battery pack |
| CN102728564A (en) * | 2012-07-02 | 2012-10-17 | 四川长虹电源有限责任公司 | Screening method of lithium cobaltate monomer batteries |
| CN103337671A (en) * | 2013-06-27 | 2013-10-02 | 国家电网公司 | Cascade utilization screening method of waste power batteries |
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| KR20030034853A (en) * | 2001-10-29 | 2003-05-09 | 금호석유화학 주식회사 | Method for evaluating their capacities using short-time high rate discharge characteristic of batteries |
| CN101764259A (en) * | 2010-01-15 | 2010-06-30 | 苏州星恒电源有限公司 | Method for group matching of power lithium-ion rechargeable battery |
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| CN103337671A (en) * | 2013-06-27 | 2013-10-02 | 国家电网公司 | Cascade utilization screening method of waste power batteries |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387849A (en) * | 2018-04-20 | 2018-08-10 | 清华大学 | The rapid detection method and device of lithium ion battery self discharge |
| CN108387849B (en) * | 2018-04-20 | 2023-10-31 | 清华大学 | Method and device for rapidly detecting self-discharge of lithium ion battery |
| WO2020147315A1 (en) * | 2019-01-16 | 2020-07-23 | 上海理工大学 | Method for rapidly screening self discharge of parallel battery |
| 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 |
| CN113296005A (en) * | 2021-04-25 | 2021-08-24 | 浙江超威创元实业有限公司 | Method for testing voltage drop of battery |
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Application publication date: 20130904 |