CN108393279A - A kind of method of lithium ion battery self discharge screening - Google Patents
A kind of method of lithium ion battery self discharge screening Download PDFInfo
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- CN108393279A CN108393279A CN201810108583.8A CN201810108583A CN108393279A CN 108393279 A CN108393279 A CN 108393279A CN 201810108583 A CN201810108583 A CN 201810108583A CN 108393279 A CN108393279 A CN 108393279A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
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- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
Abstract
The present invention relates to a kind of methods of lithium ion battery self discharge screening, include the following steps：（1）After battery after chemical conversion is formed stable SEI films by high temperature ageing, secondary fluid infusion is carried out to it, reaches battery total amount reservoir quantity requirement；（2）Sealing cleaning is carried out to battery；（3）Upper cabinet partial volume is carried out to battery, and carries out charge and discharge cycles processing；（4）It carries out shelving processing, real-time recording voltage changing value after battery partial volume；（5）After treatment is shelved, capacity restoration is carried out to battery and keeps testing, and compared with the initial capacity for shelving preceding battery, calculates the self-discharge rate of capacity；（6）Using the self-discharge rate and the changing value for shelving voltage in the time as the foundation of self discharge screening K values.Error amount caused by the present invention can exclude temperature and manual operation improves the accuracy of measurement result, and certain foundation is provided for subsequent product combo.
Description
Technical field
The present invention relates to lithium ion sieve selecting technology fields, and in particular to a kind of method of lithium ion battery self discharge screening.
Background technology
With the deterioration of the in short supply and environment of the energy, new energy technology is more and more used and is promoted.Wherein
Lithium ion battery due to its energy density is high, self discharge is few, good cycle and it is environmental-friendly the features such as and rapidly sent out
Exhibition.
Lithium battery self discharge refer to battery open a way stand during voltage decline the phenomenon that, LiFePO4, LiMn2O4,
In cobalt acid lithium, ternary material electrode, lithium battery self-discharge phenomenon is inevitable.
Whether lithium ion battery self discharge reversible is divided into two kinds according to after capacitance loss：Capacitance loss is reversible, refer to by
Charging process capacity can restore again；Capacitance loss is irreversible, indicates that capacity cannot restore.Influence the factor of self discharge degree
Have：The preparation process of cathode and battery, the property and concentration of electrolyte, the storage temperature and storage time of battery, wherein to temperature
The dependence of degree is bigger.Lithium ion battery self discharge is small, and caused capacitance loss can largely restore,
Lithium battery self discharge also has the influence of external factor.First, the influence of storage time, as described above, the time is longer, then lithium
Capacitance balance between battery plus-negative plate gradually will be broken and be deepened, and the decomposition reaction of electrolyte also can accumulate some can not
Inverse capacitance loss.Thus, storage time is longer, and self-discharge rate can be increasing.
Invention content
The purpose of the present invention is to provide a kind of method of lithium ion battery self discharge screening, temperature and artificial can be excluded
Error amount caused by operation improves the accuracy of measurement result.
To achieve the above object, present invention employs following technical schemes：
A kind of method of lithium ion battery self discharge screening, includes the following steps：
（1）After battery after chemical conversion is formed stable SEI films by high temperature ageing, secondary fluid infusion is carried out to it, reaches battery
The requirement of total amount reservoir quantity；
（2）Sealing cleaning is carried out to battery；
（3）Upper cabinet partial volume is carried out to battery, and carries out charge and discharge cycles processing；
（4）It carries out shelving processing, real-time recording voltage changing value after battery partial volume；
（5）Shelve after treatment, to battery carry out capacity restoration and keep test, and with shelve before battery initial capacity phase
Than calculating the self-discharge rate of capacity；
（6）Using the self-discharge rate and the changing value for shelving voltage in the time as the foundation of self discharge screening K values.
Further, the progress charge and discharge cycles processing, carries out charge-discharge cycle twice to it using 1C electric currents, obtains it
Capability value.
Further, step（4）In, the time for shelving processing is 7 days.
As shown from the above technical solution, a kind of heretofore described self-discharge rate with capacity determines lithium ion battery certainly
The method of electric discharge screening, error amount caused by can excluding temperature and manual operation improve the accuracy of measurement result, can detect
It is screened if appropriate for final storage and self discharge under different state-of-charges, to provide qualified self discharge to screen battery,
Certain foundation is provided for subsequent product combo.
Specific implementation mode
The present embodiment, a kind of method of lithium ion battery self discharge screening includes the following steps：
Step 1：Battery, by high temperature ageing, after forming stable SEI films, then carries out it secondary fluid infusion and reaches electricity after chemical conversion
The requirement of pond total fluid-injecting amount carries out the upper cabinet partial volume of sealing cleaning to battery；
Stable SEI films are formed in the step just can guarantee that battery quality and subsequent capacity play and battery performance causes centainly
Influence, for self discharge screening stable Sample Cell is provided.
Step 2：Upper cabinet partial volume is carried out to battery, charge-discharge cycle is carried out twice to it with 1C electric currents, obtains its capability value C0；
Step 3：It after battery partial volume, is shelved on detecting box 7 days, real-time recording voltage changing value；
Step 4：The initial capacity C0 phases obtained before the test for carrying out capacity restoration and holding to the battery after shelving 7 days, with 7 days
Than calculating the self-discharge rate of capacity；
Self-discharge rate=（The capacity that C0- is released after seven days）/C0*100%.
In the step, the influence of temperature and cabinet point to partial volume again need to be excluded, obtained capacity self-discharge rate is that capacity is extensive
The difference of multiple rate and conservation rate, represents the loss late that time content amount is shelved in this section；
Step 5：When the self-discharge rate of the battery capacity under SOC different conditions meets the performance requirement of product, with reference to voltage in 7 days
Variation provide rational voltage self discharge data, in this, as self discharge screen K values foundation.According to the K values provided, acquisition
The voltage tested before seven days and the voltage after seven days is shelved, the difference of the two is found out, self-discharge value average daily is calculated, if
It is then that the big battery of self discharge belongs to normal battery if being less than K values more than K values.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of method of lithium ion battery self discharge screening, which is characterized in that include the following steps：
（1）After battery after chemical conversion is formed stable SEI films by high temperature ageing, secondary fluid infusion is carried out to it, reaches battery
The requirement of total amount reservoir quantity；
（2）Sealing cleaning is carried out to battery；
（3）Upper cabinet partial volume is carried out to battery, and carries out charge and discharge cycles processing；
（4）It carries out shelving processing, real-time recording voltage changing value after battery partial volume；
（5）Shelve after treatment, to battery carry out capacity restoration and keep test, and with shelve before battery initial capacity phase
Than calculating the self-discharge rate of capacity；
（6）Using the self-discharge rate and the changing value for shelving voltage in the time as the foundation of self discharge screening K values.
2. the method for lithium ion battery self discharge screening according to claim 1, it is characterised in that：Step（3）In, it is described
Charge and discharge cycles processing is carried out, charge-discharge cycle is carried out twice to it using 1C electric currents, obtains its capability value.
3. the method for lithium ion battery self discharge screening according to claim 1, it is characterised in that：Step（4）In, it is described
The time for shelving processing is 7 days.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188288A (en) * | 2018-09-30 | 2019-01-11 | 江西安驰新能源科技有限公司 | A kind of power battery self discharge detection and stepping technique |
| CN109877064A (en) * | 2019-01-16 | 2019-06-14 | 上海理工大学 | A kind of method that batteries in parallel connection self discharge is quickly screened |
| CN110201913A (en) * | 2019-05-29 | 2019-09-06 | 河南电池研究院有限公司 | A kind of screening technique of soft bag lithium ionic cell consistency |
| CN111123120A (en) * | 2019-11-29 | 2020-05-08 | 合肥国轩高科动力能源有限公司 | Method for measuring self-discharge current of lithium ion battery |
| CN111697271A (en) * | 2020-03-06 | 2020-09-22 | 万向一二三股份公司 | Lithium ion battery formation and capacity-dividing method |
| CN113311346A (en) * | 2021-05-19 | 2021-08-27 | 北京车和家信息技术有限公司 | Battery cell early warning method and device, cloud platform and storage medium |
| CN114069075A (en) * | 2021-10-27 | 2022-02-18 | 风帆有限责任公司 | Lithium ion battery self-discharge screening method |
| CN114082680A (en) * | 2021-11-22 | 2022-02-25 | 芜湖天弋能源科技有限公司 | Method for optimizing cycle performance of lithium battery module |
| CN116106757A (en) * | 2022-12-06 | 2023-05-12 | 北汽福田汽车股份有限公司 | Battery cell detection method and device, storage medium and electronic equipment |
| CN117214740A (en) * | 2023-11-08 | 2023-12-12 | 宁德时代新能源科技股份有限公司 | Self-discharge abnormality detection method and device, electronic equipment and storage medium |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188288A (en) * | 2018-09-30 | 2019-01-11 | 江西安驰新能源科技有限公司 | A kind of power battery self discharge detection and stepping technique |
| CN109877064A (en) * | 2019-01-16 | 2019-06-14 | 上海理工大学 | A kind of method that batteries in parallel connection self discharge is quickly screened |
| CN109877064B (en) * | 2019-01-16 | 2021-06-22 | 上海理工大学 | Method for rapidly screening self-discharge of parallel batteries |
| CN110201913B (en) * | 2019-05-29 | 2020-12-29 | 河南电池研究院有限公司 | Screening method for consistency of soft package lithium ion battery |
| CN110201913A (en) * | 2019-05-29 | 2019-09-06 | 河南电池研究院有限公司 | A kind of screening technique of soft bag lithium ionic cell consistency |
| CN111123120A (en) * | 2019-11-29 | 2020-05-08 | 合肥国轩高科动力能源有限公司 | Method for measuring self-discharge current of lithium ion battery |
| CN111123120B (en) * | 2019-11-29 | 2021-09-03 | 合肥国轩高科动力能源有限公司 | Method for measuring self-discharge current of lithium ion battery |
| CN111697271A (en) * | 2020-03-06 | 2020-09-22 | 万向一二三股份公司 | Lithium ion battery formation and capacity-dividing method |
| CN113311346A (en) * | 2021-05-19 | 2021-08-27 | 北京车和家信息技术有限公司 | Battery cell early warning method and device, cloud platform and storage medium |
| CN113311346B (en) * | 2021-05-19 | 2024-02-06 | 北京车和家信息技术有限公司 | Battery cell early warning method and device, cloud platform and storage medium |
| CN114069075A (en) * | 2021-10-27 | 2022-02-18 | 风帆有限责任公司 | Lithium ion battery self-discharge screening method |
| CN114069075B (en) * | 2021-10-27 | 2024-04-05 | 风帆有限责任公司 | Self-discharge screening method for lithium ion battery |
| CN114082680A (en) * | 2021-11-22 | 2022-02-25 | 芜湖天弋能源科技有限公司 | Method for optimizing cycle performance of lithium battery module |
| CN116106757A (en) * | 2022-12-06 | 2023-05-12 | 北汽福田汽车股份有限公司 | Battery cell detection method and device, storage medium and electronic equipment |
| CN117214740A (en) * | 2023-11-08 | 2023-12-12 | 宁德时代新能源科技股份有限公司 | Self-discharge abnormality detection method and device, electronic equipment and storage medium |
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Application publication date: 20180814 |