CN104466277A - Self-discharging screening method of lithium ion battery - Google Patents
Self-discharging screening method of lithium ion battery Download PDFInfo
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- CN104466277A CN104466277A CN201410728127.5A CN201410728127A CN104466277A CN 104466277 A CN104466277 A CN 104466277A CN 201410728127 A CN201410728127 A CN 201410728127A CN 104466277 A CN104466277 A CN 104466277A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a self-discharging screening method of a lithium ion battery. The method comprises the following steps: step 1: pre-charging a battery to be screened to be in a full or half state; performing high-temperature aging treatment and storing at constant temperature; marking detection open-circuit voltage as OCV1 and storing at constant temperature; marking detection open-circuit voltage as OCV2; calculating a voltage critical value U0 in the same phrase, wherein the battery with the condition that OCV2 is less than U0 is a serious self-discharging battery; and step 2: removing the self-discharging battery by using a 3o circulating way based on voltage pressure before/after the laying-aside of the battery removed in the step 1 in a full-charge state or a half-charge state. According to the self-discharging screening method of the lithium ion battery, the battery is screened after the battery is laid aside in the full-charge state or the half-charge state and the open-circuit voltage is determined, and the corresponding self-discharging batteries are removed by using the 3o circulating way, so that the self-discharging screening of the lithium ion battery is realized.
Description
Technical field
The present invention relates to a kind of lithium ion battery self discharge screening technique.Be specially adapted to select the self discharge under full (partly) the electric state of lithium ion battery.
Background technology
It is high that lithium battery has specific energy, and self-discharge rate is low, and high temperature performance is good and the discharge and recharge life-span is long, the features such as memory-less effect.Be widely used at present on the products such as notebook computer, video camera, digital camera, PDA(Personal Digital Assistant), communication terminal product and electric tool.More piece cell serial or parallel connection need use, to reach higher output voltage and capacity by many products.Each batch of battery performance such as capacity, internal resistance, self-discharge rate in technique and preparation process is variant.The basically identical cell of screenability is composition battery pack key link, wherein most important to the screening of monomer self-discharge battery, and have for lithium ion self discharge selection method the problem that complexity, False Rate are high at present, therefore need a kind of simple, accurate self discharge screening technique for reducing shipment risk lithium battery manufacturer, improve the quality of products.
Summary of the invention
For above problem, the present invention designs a kind of lithium ion battery self discharge screening technique, the method is carried out screening after determining open circuit voltage after first full for battery electricity or half electricity being shelved and is adopted " 3 σ " round-robin method to reject corresponding self-discharge battery again thus realize lithium ion battery self discharge screening, for reaching this object, the invention provides a kind of lithium ion battery self discharge screening technique, comprise following two steps:
Step one, battery to be screened is charged in advance full electricity or half electricity, carry out high temperature ageing process, normal temperature stores again, detect open circuit voltage and be designated as OCV1 normal temperature storage again, detect open circuit voltage and be designated as OCV2, calculate the OCV2 charge threshold level U0 same period, the battery of OCV2< U0 is serious self-discharge battery;
Step 2, to the battery of rejecting after step one, full electricity or half electricity are shelved front and back voltage difference and are adopted " 3 σ " endless form to reject self-discharge battery;
Described " 3 σ " endless form is as follows, full electricity or half battery are shelved to the battery of rear voltage OCV2 >=U0, obtain the voltage difference delta OCV=OCV1-OCV2 that it shelves front and back, its Average is asked to Δ OCV, Stdev, USL=Average+3*Stdev, LSL=Average-3*Stdev, the value rejecting Δ OCV is greater than USL and is less than the record of LSL, to the battery record of residue Δ OCV by above requirement cycle calculations N time, stop circulating when AverageN value is equal with Average (N-1) value, now, to the battery of secondary OCV2 >=U0 by the gross, the recording mark of Δ OCV value >=AverageN+3*StdevN is slight self-discharge battery.
Improve further as the present invention, the temperature that step one carries out high temperature ageing process is 45 ± 3 DEG C, considers that the temperature of lithium battery actual conditions high temperature ageing process should be 45 ± 3 DEG C.
Improve further as the present invention, the time that step one carries out high temperature ageing process is 3 days, the high temperature ageing processing time should not long should not too shortly should be also 3 days.
Improve further as the present invention, step one normal temperature memory time first time is 1 day, and second time normal temperature memory time is 10 days, and normal temperature of the present invention can be determined according to battery actual conditions memory time accordingly.
Screening technique of the present invention is different from common full (partly) electricity and shelves rear voltage and voltage difference self discharge definite value selects mode, after the advanced row filter of the method, " 3 σ " circulation elimination method is adopted again to voltage difference, thus accurately can screen self-discharge battery, thus substantially increase screening precision, and then reduce shipment risk, improve the quality of products.
Accompanying drawing explanation
Fig. 1 is that one batch of full electricity shelves rear voltage's distribiuting;
Fig. 2 shelves front and back voltage difference delta OCV=OCV1-OCV2 and expires electricity and shelve rear voltage OCV2 and distribute for certain batch of full electricity;
Fig. 3 is the normal distribution that one batch of full electricity shelves the cell voltage difference Δ OCV of front and back OCV2 >=4110mV.
Embodiment
Below in conjunction with drawings and Examples, invention is described in detail:
The present invention designs a kind of lithium ion battery self discharge screening technique, and the method is carried out screening after determining open circuit voltage after first full for battery electricity or half electricity being shelved and adopted " 3 σ " round-robin method to reject corresponding self-discharge battery again thus realize lithium ion battery self discharge screening.
As an embodiment of the present invention, the invention provides a kind of lithium ion battery self discharge screening technique, it is characterized in that: comprise following two steps:
Step one, battery to be screened is charged in advance full electricity or half electricity, carry out high temperature ageing process, normal temperature stores again, detect open circuit voltage and be designated as OCV1 normal temperature storage again, detect open circuit voltage and be designated as OCV2, calculate the OCV2 charge threshold level U0 same period, the battery of OCV2< U0 is serious self-discharge battery;
Step 2, to the battery of rejecting after step one, full electricity or half electricity are shelved front and back voltage difference and are adopted " 3 σ " endless form to reject self-discharge battery;
Described " 3 σ " endless form is as follows, full electricity or half battery are shelved to the battery of rear voltage OCV2 >=U0, obtain the voltage difference delta OCV=OCV1-OCV2 that it shelves front and back, its Average is asked to Δ OCV, Stdev, USL=Average+3*Stdev, LSL=Average-3*Stdev, the value rejecting Δ OCV is greater than USL and is less than the record of LSL, to the battery record of residue Δ OCV by above requirement cycle calculations N time, stop circulating when AverageN value is equal with Average (N-1) value, now, to the battery of secondary OCV2 >=U0 by the gross, the recording mark of Δ OCV value >=AverageN+3*StdevN is slight self-discharge battery.
For one batch of full electric battery screening: select certain production batch lithium ion battery, be described in detail to lithium ion battery self discharge screening technique.
1 class (i.e. 2 classes in Fig. 2) self-discharge battery screening in Fig. 1: certain batch of lithium ion battery 0.2C is charged to 4.2V in advance, and 45 ± 3 DEG C of high temperature ageings are after 3 days, and normal temperature stores 1 day for the first time, detects open circuit voltage (being designated as OCV1).Second time normal temperature stores 10 days, detects open circuit voltage (being designated as OCV2).Analyze the change in voltage after second time normal temperature stores, determine the critical value U0 that synchronous voltage changes, the cell voltage of Fig. 1: OCV2<4110mV declines very fast, and weeding out this part is serious self-discharge battery.
3 class self-discharge battery screenings in Fig. 2: to the battery of OCV2 >=4110mV, first time is obtained Average, Stdev of this type of all Δ OCV and is designated as Average1, Stdev1 (see Fig. 3) respectively, and calculates USL1=Average1+3*Stdev1, LSL1=Average1-3*Stdev1.The value rejecting Δ OCV is greater than USL1 and is less than the record of LSL1.The record second time of residue Δ OCV is calculated to Average, Stdev and is designated as Average2, Stdev2, USL2=Average2+3*Stdev2, LSL2=Average2-3*Stdev2 respectively.The value rejecting Δ OCV is greater than USL2 and is less than the record of LSL2, and residue records circulation successively N time, stops circulating when AverageN value is equal with Average (N-1) value.Now, to the battery of secondary OCV2 >=4110mV by the gross, the recording mark of Δ OCV value >=AverageN+3*StdevN is slight self-discharge battery.
The above is only preferred embodiment of the present invention, is not restriction the present invention being made to any other form, and any amendment done according to technical spirit of the present invention or equivalent variations, still belong to the present invention's scope required for protection.
Claims (4)
1. a lithium ion battery self discharge screening technique, is characterized in that: comprise following two steps:
Step one, battery to be screened is charged in advance full electricity or half electricity, carry out high temperature ageing process, normal temperature stores again, detect open circuit voltage and be designated as OCV1 normal temperature storage again, detect open circuit voltage and be designated as OCV2, calculate the OCV2 charge threshold level U0 same period, the battery of OCV2< U0 is serious self-discharge battery;
Step 2, to the battery of rejecting after step one, full electricity or half electricity are shelved front and back voltage difference and are adopted " 3 σ " endless form to reject self-discharge battery;
Described " 3 σ " endless form is as follows, full electricity or half battery are shelved to the battery of rear voltage OCV2 >=U0, obtain the voltage difference delta OCV=OCV1-OCV2 that it shelves front and back, its Average is asked to Δ OCV, Stdev, USL=Average+3*Stdev, LSL=Average-3*Stdev, the value rejecting Δ OCV is greater than USL and is less than the record of LSL, to the battery record of residue Δ OCV by above requirement cycle calculations N time, stop circulating when AverageN value is equal with Average (N-1) value, now, to the battery of secondary OCV2 >=U0 by the gross, the recording mark of Δ OCV value >=AverageN+3*StdevN is slight self-discharge battery.
2. lithium ion battery self discharge screening technique as claimed in claim 1, is characterized in that: the temperature that step one carries out high temperature ageing process is 45 ± 3 DEG C.
3. lithium ion battery self discharge screening technique as claimed in claim 1, is characterized in that: the time that step one carries out high temperature ageing process is 3 days.
4. lithium ion battery self discharge screening technique as claimed in claim 1, is characterized in that: step one first time normal temperature memory time is 1 day, and second time normal temperature memory time is 10 days.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842051A (en) * | 2017-01-25 | 2017-06-13 | 天津市捷威动力工业有限公司 | A kind of screening technique of ternary system lithium-ion-power cell self discharge |
| CN106908727A (en) * | 2015-12-22 | 2017-06-30 | 郑州比克电池有限公司 | The method for precisely detecting lithium ion battery self discharge |
| CN107091991A (en) * | 2017-04-28 | 2017-08-25 | 天津力神电池股份有限公司 | Lithium ion battery voltage conformity classification method |
| CN107219468A (en) * | 2017-06-28 | 2017-09-29 | 湖北金泉新材料有限责任公司 | A kind of lithium ion battery self discharge screening technique and Li-ion batteries piles |
| CN108061860A (en) * | 2017-11-24 | 2018-05-22 | 上海华普汽车有限公司 | A kind of self-discharge of battery detection method and lithium battery method for sorting |
| CN108459273A (en) * | 2018-02-28 | 2018-08-28 | 河南国能电池有限公司 | Battery core manufacture test method and device |
| CN108508365A (en) * | 2017-04-16 | 2018-09-07 | 万向二三股份公司 | A kind of lithium ion battery self discharge screening technique |
| CN108682908A (en) * | 2018-05-17 | 2018-10-19 | 惠州拓邦电气技术有限公司 | A kind of screening technique of lithium ion battery self discharge |
| WO2019090768A1 (en) * | 2017-11-13 | 2019-05-16 | Oppo广东移动通信有限公司 | Method for monitoring safety of adapter, terminal device and battery thereof and monitoring system |
| CN110165319A (en) * | 2019-06-10 | 2019-08-23 | 河南福森新能源科技有限公司 | A kind of method for separating of high-capacity lithium battery self-discharge performance |
| CN110444826A (en) * | 2019-07-05 | 2019-11-12 | 联动天翼新能源有限公司 | The forming and capacity dividing method of lithium battery |
| CN110434093A (en) * | 2019-07-10 | 2019-11-12 | 上海空间电源研究所 | A kind of lithium-ions battery batch screening technique |
| CN111679219A (en) * | 2020-06-10 | 2020-09-18 | 江苏开沃汽车有限公司 | Self-discharge screening method for lithium ion power battery |
| CN112433162A (en) * | 2020-10-26 | 2021-03-02 | 惠州市豪鹏科技有限公司 | Lithium ion battery aging method |
| CN112698227A (en) * | 2020-11-24 | 2021-04-23 | 合肥国轩高科动力能源有限公司 | Lithium ion battery self-discharge abnormity screening method |
| CN113484773A (en) * | 2021-08-03 | 2021-10-08 | 湖北亿纬动力有限公司 | Screening method for self-discharge of lithium ion battery |
| CN113578792A (en) * | 2021-06-25 | 2021-11-02 | 湖北亿纬动力有限公司 | Lithium ion battery self-discharge screening method and device and storage medium |
| CN113655388A (en) * | 2021-08-11 | 2021-11-16 | 苏州领湃新能源科技有限公司 | Self-discharge monitoring and production control method of lithium ion battery |
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| CN104190639A (en) * | 2014-07-29 | 2014-12-10 | 江西世纪长河新电源有限公司 | Self-discharge screening method of lithium ion batteries |
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| CN104190639A (en) * | 2014-07-29 | 2014-12-10 | 江西世纪长河新电源有限公司 | Self-discharge screening method of lithium ion batteries |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106908727A (en) * | 2015-12-22 | 2017-06-30 | 郑州比克电池有限公司 | The method for precisely detecting lithium ion battery self discharge |
| CN106842051A (en) * | 2017-01-25 | 2017-06-13 | 天津市捷威动力工业有限公司 | A kind of screening technique of ternary system lithium-ion-power cell self discharge |
| CN108508365A (en) * | 2017-04-16 | 2018-09-07 | 万向二三股份公司 | A kind of lithium ion battery self discharge screening technique |
| CN107091991A (en) * | 2017-04-28 | 2017-08-25 | 天津力神电池股份有限公司 | Lithium ion battery voltage conformity classification method |
| CN107219468A (en) * | 2017-06-28 | 2017-09-29 | 湖北金泉新材料有限责任公司 | A kind of lithium ion battery self discharge screening technique and Li-ion batteries piles |
| US11204393B2 (en) | 2017-11-13 | 2021-12-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Terminal device, method for monitoring battery safety therefor |
| WO2019090768A1 (en) * | 2017-11-13 | 2019-05-16 | Oppo广东移动通信有限公司 | Method for monitoring safety of adapter, terminal device and battery thereof and monitoring system |
| CN108061860A (en) * | 2017-11-24 | 2018-05-22 | 上海华普汽车有限公司 | A kind of self-discharge of battery detection method and lithium battery method for sorting |
| CN108459273A (en) * | 2018-02-28 | 2018-08-28 | 河南国能电池有限公司 | Battery core manufacture test method and device |
| CN108459273B (en) * | 2018-02-28 | 2020-05-19 | 河南国能电池有限公司 | Battery cell delivery test method and device |
| CN108682908B (en) * | 2018-05-17 | 2020-01-17 | 惠州拓邦电气技术有限公司 | Screening method for self-discharge of lithium ion battery |
| CN108682908A (en) * | 2018-05-17 | 2018-10-19 | 惠州拓邦电气技术有限公司 | A kind of screening technique of lithium ion battery self discharge |
| CN110165319A (en) * | 2019-06-10 | 2019-08-23 | 河南福森新能源科技有限公司 | A kind of method for separating of high-capacity lithium battery self-discharge performance |
| CN110444826B (en) * | 2019-07-05 | 2021-09-10 | 联动天翼新能源有限公司 | Formation and capacity grading method for lithium battery |
| CN110444826A (en) * | 2019-07-05 | 2019-11-12 | 联动天翼新能源有限公司 | The forming and capacity dividing method of lithium battery |
| CN110434093A (en) * | 2019-07-10 | 2019-11-12 | 上海空间电源研究所 | A kind of lithium-ions battery batch screening technique |
| CN111679219A (en) * | 2020-06-10 | 2020-09-18 | 江苏开沃汽车有限公司 | Self-discharge screening method for lithium ion power battery |
| CN111679219B (en) * | 2020-06-10 | 2022-06-14 | 江苏开沃汽车有限公司 | Self-discharge screening method for lithium ion power battery |
| CN112433162A (en) * | 2020-10-26 | 2021-03-02 | 惠州市豪鹏科技有限公司 | Lithium ion battery aging method |
| CN112433162B (en) * | 2020-10-26 | 2023-09-01 | 惠州市豪鹏科技有限公司 | Aging method of lithium ion battery |
| CN112698227A (en) * | 2020-11-24 | 2021-04-23 | 合肥国轩高科动力能源有限公司 | Lithium ion battery self-discharge abnormity screening method |
| CN113578792A (en) * | 2021-06-25 | 2021-11-02 | 湖北亿纬动力有限公司 | Lithium ion battery self-discharge screening method and device and storage medium |
| CN113484773A (en) * | 2021-08-03 | 2021-10-08 | 湖北亿纬动力有限公司 | Screening method for self-discharge of lithium ion battery |
| CN113655388A (en) * | 2021-08-11 | 2021-11-16 | 苏州领湃新能源科技有限公司 | Self-discharge monitoring and production control method of lithium ion battery |
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Application publication date: 20150325 |