CN102818998A - Method for detecting analyzed lithium of lithium ion power battery - Google Patents
Method for detecting analyzed lithium of lithium ion power battery Download PDFInfo
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- CN102818998A CN102818998A CN2012103127005A CN201210312700A CN102818998A CN 102818998 A CN102818998 A CN 102818998A CN 2012103127005 A CN2012103127005 A CN 2012103127005A CN 201210312700 A CN201210312700 A CN 201210312700A CN 102818998 A CN102818998 A CN 102818998A
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Abstract
The invention belongs to the technical field of lithium ion batteries, in particular discloses a method for detecting analyzed lithium of a lithium ion power battery. The method comprises the steps of: detecting a voltage between a metal housing of a lithium ion power battery to be detected and a negative terminal through a detection tool for judging whether analyzed lithium exists inside the lithium ion power battery; and when measuring that the voltage between the metal housing of the lithium ion power battery to be detected and the negative terminal is higher than 2V, knowing that no analyzed lithium exists inside the lithium ion power battery, otherwise, knowing that the analyzed lithium exists inside the lithium ion power battery. The method is simple, easy, convenient and rapid, and is used for rapidly screening bad batteries, thereby being beneficial to reduction of rejection ratio of finished batteries.
Description
Technical field
The present invention relates to technical field of lithium ion, particularly a kind of lithium-ion-power cell is analysed the detection method of lithium.
Background technology
Lithium ion battery because have the specific energy height, recycle often, advantage such as storage time is long; It not only is used widely like mobile phone, DV and laptop computer on portable electric appts, and is widely used in big-and-middle-sized electrical equipments such as electric automobile, electric bicycle and electric tool.
Along with the development of lithium electricity industry, people are heated up to the interest of electric motor car industry gradually, and the thing followed is the concerns of people to lithium ion battery performance, large-scale production and security.The lithium-ion-power cell of metal shell more and more receives people's attention as the main energy source of electric motor car, and shell voltage also more and more receives people's attention as one of lithium-ion-power cell emerging procedure parameter.
In the process of making, do not detect shell voltage in the lithium-ion-power cell of existing metal shell; Only detect both positive and negative polarity voltage, so just can't judge the state of inside battery, though cell voltage is normal sometimes; But when shell voltage is undesired; The situation that also can cause battery case to be corroded, thus battery failure caused, security incident takes place.
Summary of the invention
The detection method that the objective of the invention is to overcome the deficiency of prior art and provide a kind of lithium-ion-power cell to analyse lithium, its method of testing is simple, helps reducing the fraction defective of electrokinetic cell.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
A kind of lithium-ion-power cell is analysed the detection method of lithium, detects between metal shell and the negative terminal of lithium-ion-power cell to be measured voltage through testing tool and judges whether lithium-ion-power cell inside lithium occurs analysing; When measuring to such an extent that voltage is higher than 2V between metal shell and the negative terminal of lithium-ion-power cell to be measured, then can know this lithium-ion-power cell inner do not have analyse lithium, otherwise analyse lithium.
The positive electrode active material material of said lithium-ion-power cell to be measured is LiFePO
4, LiMn
2O
2, LiNi
xCo
yMn
zO
2, 0＜x, y, z＜1, a kind of among the x+y+z=1, or two or more is pressed different proportion and mixes and form; The negative electrode active material material is a kind of in graphite, MCMB, hard carbon, the soft carbon, or two or more is pressed different proportion and mixes and form.
The state-of-charge scope of said lithium-ion-power cell to be measured is 10%-100%.
Described testing tool is a universal electric meter.
Voltage between negative terminal and the battery metal shell of the present invention through detecting battery; Can judge battery and lithium whether occur analysing, this method is simple to operate understandable, and is convenient and swift; Can filter out bad battery rapidly, thereby help reducing the fraction defective of finished product battery.
Description of drawings
The curve synoptic diagram at different SOC state lower casing voltages of the lithium-ion-power cell that Fig. 1 provides for the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing.
A kind of lithium-ion-power cell is analysed the detection method of lithium; Voltage judges whether lithium-ion-power cell inside lithium occurs analysing between metal shell through detecting lithium-ion-power cell to be measured and negative terminal; When voltage is higher than 2V between the metal shell of lithium-ion-power cell to be measured and negative terminal; Then can know this lithium-ion-power cell inner do not have analyse lithium, otherwise analyse lithium.
In the embodiment of the invention, the state-of-charge scope of said lithium-ion-power cell to be measured is 10%-100%.
The positive electrode active material material of said lithium-ion-power cell to be measured is LiFePO
4, LiMn
2O
2, LiNi
xCo
yMn
zO
2, 0＜x, y, z＜1, a kind of among the x+y+z=1, or two or more is pressed different proportion and mixes and form; The negative electrode active material material is a kind of in graphite, MCMB, hard carbon, the soft carbon, or two or more is pressed different proportion and mixes and form.
Said testing tool can adopt any available voltage testing instrument, and is more excellent, and said testing tool adopts universal electric meter.
After adopting above-mentioned positive and negative electrode starting material to make the finished product battery through a series of processing; In 10%-100% state-of-charge SOC scope; Utilize red, the black meter pen of universal electric meter to measure the voltage of negative terminal of positive terminal and battery case, shell and the battery of battery respectively; Numerical value through measuring filters out the battery of the voltage of battery case and negative pole less than 2V, and these batteries all are that inner meeting produces the battery of analysing lithium, the risk that has battery case to be corroded.
Referring to Fig. 1, the figure shows the shell voltage under the different SOC states of lithium-ion-power cell that the embodiment of the invention provides, used positive active material is LiFePO
4, negative electrode active material is a MCMB, electrolytic solution is electrokinetic cell conventional electrolysis liquid.For the ease of explanation, following table has been listed detailed data explanation.
| The SOC state | Voltage V | Just with shell V | Shell and |
| 100% | 3.4079 | 0.784 | 2.617 |
| 90% | 3.3805 | 0.804 | 2.541 |
| 80% | 3.3363 | 0.793 | 2.563 |
| 70% | 3.3347 | 0.82 | 2.51 |
| 60% | 3.3085 | 0.809 | 2.494 |
| 50% | 3.2965 | 0.779 | 2.511 |
| 40% | 3.2942 | 0.809 | 2.448 |
| 30% | 3.2693 | 0.801 | 2.461 |
| 20% | 3.2361 | 0.778 | 2.455 |
| 10% | 3.2075 | 0.775 | 2.425 |
| 0% | 2.7682 | 0.773 | 1.991 |
By can finding out in above table and the accompanying drawing, the amplitude of variation of battery case and cathode voltage is greater than amplitude of variation anodal and battery case voltage, simultaneously, and the amplitude of variation of the amplitude of variation of cell voltage and trend and battery case and cathode voltage and similar trend.Therefore, and compare as judgment basis with the voltage of battery metal shell with anodal outside terminal, more reliable and accurate with the voltage of battery metal shell and negative pole as judgment basis.
Secondly; The voltage of battery metal shell and negative pole the change in voltage of 10%-100% state-of-charge SOC scope than the scope that is lower than 10% state-of-charge SOC in change in voltage little; In 10%-100%SOC scope, almost have no change, so the scope of regulation 10%-100%SOC is this basis for estimation applicable scope.
In addition, select the electrokinetic cell of several metal shells else, measure the lithium state of analysing that the concentration of elemental lithium in the electrolytic solution is judged battery through dissecting the back, as shown in the table:
Can find out through above table; Though cell voltage is normal; But the metal shell of first three battery and the voltage of negative terminal are far smaller than 2V, and the concentration of elemental lithium has explained that also far above last normal battery elemental lithium separates out in the electrolytic solution; The voltage of also finding simultaneously metal shell and negative terminal has evidence of corrosion less than the metal shell inside of the battery of 2V, and the battery that is higher than 2V does not then have evidence of corrosion.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (4)
1. a lithium-ion-power cell is analysed the detection method of lithium, it is characterized in that, detects between metal shell and the negative terminal of lithium-ion-power cell to be measured voltage through testing tool and judges whether lithium-ion-power cell inside lithium occurs analysing; When measuring to such an extent that voltage is higher than 2V between metal shell and the negative terminal of lithium-ion-power cell to be measured, then can know this lithium-ion-power cell inner do not have analyse lithium, otherwise analyse lithium.
2. lithium-ion-power cell according to claim 1 is analysed the detection method of lithium, it is characterized in that, the positive electrode active material material of said lithium-ion-power cell to be measured is LiFePO
4, LiMn
2O
2, LiNi
xCo
yMn
zO
2, 0＜x, y, z＜1, a kind of among the x+y+z=1, or two or more is pressed different proportion and mixes and form; The negative electrode active material material is a kind of in graphite, MCMB, hard carbon, the soft carbon, or two or more is pressed different proportion and mixes and form.
3. lithium-ion-power cell according to claim 2 is analysed the detection method of lithium, it is characterized in that, the state-of-charge scope of said lithium-ion-power cell to be measured is 10%-100%.
4. analyse the detection method of lithium according to each described lithium-ion-power cell of claim 1 ~ 3, it is characterized in that, described testing tool is a universal electric meter.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728078A (en) * | 2017-11-17 | 2018-02-23 | 力信（江苏）能源科技有限责任公司 | Lithium ion battery analyses the detection method of lithium |
| CN108169681A (en) * | 2017-12-12 | 2018-06-15 | 合肥国轩高科动力能源有限公司 | A kind of method for detecting the corrosion of lithium ion battery aluminum enclosure |
| CN108519558A (en) * | 2018-04-28 | 2018-09-11 | 北京新能源汽车股份有限公司 | A kind of detection method, controller and the automobile of power battery analysis lithium |
| CN108572325A (en) * | 2018-04-28 | 2018-09-25 | 北京新能源汽车股份有限公司 | A kind of detection method, device and the test equipment of battery analysis lithium |
| CN108732506A (en) * | 2018-04-26 | 2018-11-02 | 合肥国轩高科动力能源有限公司 | A kind of detection method of lithium-ion-power cell analysis lithium |
| WO2018209784A1 (en) * | 2017-05-16 | 2018-11-22 | 宁德时代新能源科技股份有限公司 | Lithium precipitation detection method for battery, battery management system, and battery system |
| CN109596992A (en) * | 2018-12-28 | 2019-04-09 | 中国标准化研究院 | A kind of lithium ion battery accelerates the early stage verification method of analysis lithium failure |
| CN109622425A (en) * | 2018-12-12 | 2019-04-16 | 江苏时代新能源科技有限公司 | A method of screening blackspot analyses lithium risk battery core |
| CN111175662A (en) * | 2018-11-13 | 2020-05-19 | 清华大学 | Lithium ion battery evaluation method and lithium ion battery detection system |
| CN111458642A (en) * | 2020-04-22 | 2020-07-28 | 上海空间电源研究所 | Nondestructive testing method for lithium separation of lithium ion storage battery |
| CN112383102A (en) * | 2020-10-28 | 2021-02-19 | 欣旺达电动汽车电池有限公司 | Battery charging method, electronic device and storage medium |
| CN112673266A (en) * | 2020-04-30 | 2021-04-16 | 华为技术有限公司 | Lithium analysis detection method and device, and polarization ratio acquisition method and device |
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| CN1858613A (en) * | 2005-05-08 | 2006-11-08 | 王宏栋 | Detecting method and device for lithium ion cell material |
| US20100124693A1 (en) * | 2008-11-17 | 2010-05-20 | Shinichiro Kosugi | Secondary battery pack |
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| CN1858613A (en) * | 2005-05-08 | 2006-11-08 | 王宏栋 | Detecting method and device for lithium ion cell material |
| US20100124693A1 (en) * | 2008-11-17 | 2010-05-20 | Shinichiro Kosugi | Secondary battery pack |
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| WO2018209784A1 (en) * | 2017-05-16 | 2018-11-22 | 宁德时代新能源科技股份有限公司 | Lithium precipitation detection method for battery, battery management system, and battery system |
| CN108872859A (en) * | 2017-05-16 | 2018-11-23 | 宁德时代新能源科技股份有限公司 | Detection method for battery lithium separation, battery management system and battery system |
| CN107728078A (en) * | 2017-11-17 | 2018-02-23 | 力信（江苏）能源科技有限责任公司 | Lithium ion battery analyses the detection method of lithium |
| CN108169681A (en) * | 2017-12-12 | 2018-06-15 | 合肥国轩高科动力能源有限公司 | A kind of method for detecting the corrosion of lithium ion battery aluminum enclosure |
| CN108732506A (en) * | 2018-04-26 | 2018-11-02 | 合肥国轩高科动力能源有限公司 | A kind of detection method of lithium-ion-power cell analysis lithium |
| CN108572325B (en) * | 2018-04-28 | 2021-03-26 | 北京新能源汽车股份有限公司 | Detection method, device and test equipment for lithium separation of battery |
| CN108572325A (en) * | 2018-04-28 | 2018-09-25 | 北京新能源汽车股份有限公司 | A kind of detection method, device and the test equipment of battery analysis lithium |
| CN108519558A (en) * | 2018-04-28 | 2018-09-11 | 北京新能源汽车股份有限公司 | A kind of detection method, controller and the automobile of power battery analysis lithium |
| CN111175662A (en) * | 2018-11-13 | 2020-05-19 | 清华大学 | Lithium ion battery evaluation method and lithium ion battery detection system |
| CN111175662B (en) * | 2018-11-13 | 2021-07-09 | 清华大学 | Lithium ion battery evaluation method and lithium ion battery detection system |
| CN109622425A (en) * | 2018-12-12 | 2019-04-16 | 江苏时代新能源科技有限公司 | A method of screening blackspot analyses lithium risk battery core |
| CN109596992A (en) * | 2018-12-28 | 2019-04-09 | 中国标准化研究院 | A kind of lithium ion battery accelerates the early stage verification method of analysis lithium failure |
| CN111458642A (en) * | 2020-04-22 | 2020-07-28 | 上海空间电源研究所 | Nondestructive testing method for lithium separation of lithium ion storage battery |
| CN112673266A (en) * | 2020-04-30 | 2021-04-16 | 华为技术有限公司 | Lithium analysis detection method and device, and polarization ratio acquisition method and device |
| CN112383102A (en) * | 2020-10-28 | 2021-02-19 | 欣旺达电动汽车电池有限公司 | Battery charging method, electronic device and storage medium |
| CN112383102B (en) * | 2020-10-28 | 2024-03-19 | 欣旺达动力科技股份有限公司 | Battery charging method, electronic device, and storage medium |
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