CN104950264B - The method for testing lithium ion battery self discharge - Google Patents
The method for testing lithium ion battery self discharge Download PDFInfo
- Publication number
- CN104950264B CN104950264B CN201510367998.3A CN201510367998A CN104950264B CN 104950264 B CN104950264 B CN 104950264B CN 201510367998 A CN201510367998 A CN 201510367998A CN 104950264 B CN104950264 B CN 104950264B
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- battery
- self discharge
- test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of field of lithium ion battery, especially a kind of method of test lithium ion battery self discharge；The object of the present invention is to provide a kind of self discharge method for separating accuracy height, mixed shelves probability is small and makes the method for the test lithium ion battery self discharge of lithium ion battery packet long lifespan；The first step, by lithium ion battery under the adjustment of SOC states after, under conditions of 45~60 DEG C, storage carries out open-circuit voltage test after 3~10 days to lithium ion battery, and is denoted as OCV1；Second step, by the lithium ion battery after test again under conditions of 45~60 DEG C, storage carries out open-circuit voltage test after 3~10 days to lithium ion battery, and is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and be that a class sorts self discharge with 1mV-5mV.
Description
Technical field
The present invention relates to field of lithium ion battery, especially a kind of method of test lithium ion battery self discharge.
Background technology
Lithium ion battery has many advantages, such as that energy density is high, service life is long and voltage is high, is not only in portable electronic
In equipment, such as mobile phone, mobile power, digital camera and the consumer commercially available quick development of notebook, and electronic
The emerging markets such as the power categories such as automobile, electric bicycle and electric tool market and energy storage class market have also obtained widely answering
With.
In these emerging market fields, battery be by original monomer using transformation in order to which connection in series-parallel is applied in combination, to electricity
The consistency in pond proposes very high requirement.One of the biggest factor of self discharge as the influence battery combination backpack body service life, if
Self discharge is inconsistent, and the SOC state differences of battery of often being gone here and there when serial number is more, between battery backpack body become larger, and super-charge super-discharge occur
Probability it is very big, backpack body is generally difficult to worry along 100 cycles, otherwise uses the equal balance system of expensive BMS.
The self discharge of battery refers to when external circuit disconnects, and the battery capacity caused by inside battery spontaneous reaction is lost,
This kind of loss is divided into two classes for lithium ion battery, and one kind is reversible self discharge caused by internal micro-short circuit, this kind of to put certainly
Electric rate is smaller under normal circumstances, another kind of for capacitance loss caused by redox of the electrolyte on positive and negative anodes, this part
For irreversible loss.But either which kind of self discharge, self discharge speed can all have differences between battery, and battery is caused to differ
It causes, if sorting is bad, battery pack body life time can be caused extremely short.
For lithium ion battery, although its self discharge with respect to very little for other batteries, since it is in power and storage
The application of energy aspect is all often that a large amount of battery series-parallel connections use, and the SOC state consistencies between each string are to backpack body cycle life
It is most important, there is any a string of battery SOC state more or will just will appear serious super-charge super-discharge electrical phenomena less, battery will
It will appear serious security risk --- " interior short ".In addition this SOC differences will quickly be amplified in cyclic process, originally
The combination of monomers of 2000~3000 cycles all can not do 100 cycles substantially together.Influence pole of the self discharge to battery pack
Greatly, the different battery strings of self discharge together, can make the SOC states initially adjusted become irregular so that battery is in the longevity
Life and secure context there is a problem of very big.Therefore, requirement of any battery pack to self-discharge of battery consistency is all very high.Initially
SOC states can be by charge and discharge come control, and the consistency of self discharge is exactly crucial.So a kind of effectively select
The method of self-discharge of battery is just most important in process of production.The conventional method for selecting self discharge consistency is first will be electric
Pond is fully charged, records its voltage value, and voltage tester record is carried out again after storing a period of time, using voltage difference twice as selecting
The foundation of self discharge.This method select self discharge consistency the result is that mistake, rather than certain patents institute
The error said is big.This kind of patent is such as：Patent CN103008261 A also have to adjust battery SOC state to electric discharge state and test
, such as：CN 103293481 A.Although the method that these patents propose all refers to the relationship of self discharge and △ V, to certainly
Electric discharge and the understanding of △ V stops on the surface, and obtained result is it may be said that mistake.No matter which SOC shape battery will adjust to
State, it is necessary to carry out charge and discharge and can be only achieved, that is, use many days of electric current constant current constant voltage of very little, all be deposited before and after being stored after stopping
It is not only to include self discharge in a △ V, this △ V, further comprises corrosion current caused by a polarization, be referred to as interior
Portion from euqalizing current, shared by ratio it is very big, therefore, the basis of aforementioned these patents sorting is problematic in that, as a result natural
Needs of production cannot be met.
In view of the above problems, the present invention proposes a kind of test that can eliminate the voltage drop caused by the euqalizing current from putting
The method of electricity.
Invention content
It is high, mixed that it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of self discharge method for separating accuracys
Shelves probability is small and makes the method for the test lithium ion battery self discharge of lithium ion battery packet long lifespan.
In order to achieve the above object, the method for a kind of test lithium ion battery self discharge designed by the present invention：The first step,
It is right after storing 1~10 day under conditions of 45~60 DEG C by the good lithium ion battery of capacity stepping after SOC states are adjusted
Lithium ion battery carries out open-circuit voltage test, and is denoted as OCV1；Second step, by the lithium ion battery after test again at 45~60 DEG C
Under conditions of, storage carries out open-circuit voltage test after 1~10 day to lithium ion battery, and is denoted as OCV2；Third walks, by putting certainly
Electric calculation formula △ V=OCV1-OCV2 calculate △ V, and are that a class sorts self discharge with 1mV~10mV.
Preferably, the anode of lithium ion battery is made of LiFePO4 or cobalt acid lithium, cathode is constituted for graphite.
According to the above, a kind of method of test lithium ion battery self discharge designed by the present invention, is by that will adjust
The battery of whole SOC states, for a period of time, the progress of accelerated corrosion balanced balanced current makes it be rapidly achieved balance for aging at high temperature,
Its influence tested self discharge is eliminated within the shorter time, and then test obtained voltage drop can effectively represent electricity
The self discharge in pond.
Specific implementation mode
Embodiment 1：
A kind of method of test lithium ion battery self discharge of the present embodiment description：The first step, by cobalt acid lithium/ternary ionic
After battery is under the adjustment of SOC states, under conditions of 45 DEG C, storage carries out open-circuit voltage test after 7 days to lithium ion battery, and
It is denoted as OCV1；Second step, by the lithium ion battery after test again under conditions of 55 DEG C, after storage 7 days to lithium ion battery into
Row open-circuit voltage is tested, and is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and with 1mV
Self discharge is sorted for a class.
Wherein, cobalt acid lithium battery packet number is 1$, 2#, and ternary ionic battery packet number is 3#, 4#.
Embodiment 2：
A kind of method of test lithium ion battery self discharge of the present embodiment description：The first step, by cobalt acid lithium/ternary ionic
After battery is under the adjustment of SOC states, under conditions of 60 DEG C, storage carries out open-circuit voltage test after 1 day to lithium ion battery, and
It is denoted as OCV1；Second step, by the lithium ion battery after test again under conditions of 45 DEG C, after storage 5 days to lithium ion battery into
Row open-circuit voltage is tested, and is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and with 5mV
Self discharge is sorted for a class.
Wherein, cobalt acid lithium battery packet number is 1#, 2#, and ternary ionic battery packet number is 3#, 4#.
Embodiment 3：
A kind of method of test lithium ion battery self discharge of the present embodiment description：By ferrous phosphate lithium battery in SOC shapes
After state adjustment is lower, under conditions of 55 DEG C, storage carries out open-circuit voltage test after 5 days to lithium ion battery, and is denoted as OCV1；The
Two steps, by the lithium ion battery after test again under conditions of 60 DEG C, storage carries out open-circuit voltage survey after 3 days to lithium ion battery
Examination, and it is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and be a class point with 3mV
Selected from electric discharge.
Wherein, ferrous phosphate lithium battery packet number is 1#, 2#.
Embodiment 4：
A kind of method of test lithium ion battery self discharge of the present embodiment description：By ferrous phosphate lithium battery in SOC shapes
After state adjustment is lower, under conditions of 45 DEG C, storage carries out open-circuit voltage test after 6 days to lithium ion battery, and is denoted as OCV1；The
Two steps, by the lithium ion battery after test again under conditions of 50 DEG C, storage carries out open-circuit voltage survey after 7 days to lithium ion battery
Examination, and it is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and be a class point with 5mV
Selected from electric discharge.
Wherein, ferrous phosphate lithium battery packet number is 1#, 2#.
Embodiment 5：
A kind of method of test lithium ion battery self discharge of the present embodiment description：Cobalt acid lithium/ternary ionic battery is existed
After the adjustment of SOC states is lower, under conditions of 45 DEG C, storage carries out open-circuit voltage test after 3 days to lithium ion battery, and is denoted as
OCV1；Second step, by the lithium ion battery after test again under conditions of 50 DEG C, storage opened lithium ion battery after 7 days
Road voltage tester, and it is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and with 4mV for one
A class sorts self discharge.
Wherein, cobalt acid lithium battery packet number is 1#, 2#, and ternary ionic battery packet number is 3#, 4#.
Embodiment 6：
A kind of method of test lithium ion battery self discharge of the present embodiment description：By ferrous phosphate lithium battery in SOC shapes
After state adjustment is lower, under conditions of 55 DEG C, storage carries out open-circuit voltage test after 3 days to lithium ion battery, and is denoted as OCV1；The
Two steps, by the lithium ion battery after test again under conditions of 60 DEG C, storage carries out open-circuit voltage survey after 1 day to lithium ion battery
Examination, and it is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and be a class point with 1mV
Selected from electric discharge.
Wherein, ferrous phosphate lithium battery packet number is 1#, 2#.
It is according to conditions such as capacity, internal resistance, self discharges, by embodiment 1, embodiment 2, embodiment 3, embodiment 4, reality below
It applies example 5 and embodiment 6 prepares the battery organized and adjusts the battery pack that SOC is combined into 10 strings, recycled on nebula aging cabinet
Test, record recycle 300 capacity, capacity retention ratio when calculating 300 times and the lithium ion as obtained by traditional approach
The contrast table of capacity retention ratio at 300 times of battery：
It is according to conditions such as capacity, internal resistance, self discharges, by embodiment 1, embodiment 2, embodiment 3, embodiment 4, reality below
It applies example 5 and embodiment 6 prepares the battery organized and adjusts the battery pack that SOC is combined into 10 strings, recycled on nebula aging cabinet
Test, the voltage value of 10 string battery pack of record, calculates sorting and mixes shelves probability and the lithium ion battery as obtained by traditional approach
Sorting mix the contrast table of shelves probability：
The low each series connection of the battery pack capacity retention ratio as obtained by traditional approach is can be seen that from two above table
Voltage differences are very big between battery, some batteries also be substantially full power state, the overdischarge of some batteries in addition some
Battery is short-circuit because of super-charge super-discharge；Although and the battery voltage that self discharge is screened obtained by combo again through the invention also has
Difference, but the level of not up to super-charge super-discharge.And it is gradually increased to according to the battery pack in actual use, combining bunchiness
When 50~3000 string, the difference of the capacity retention ratio of the lithium ion battery as obtained by traditional approach and the mixed shelves probability of sorting will
Bigger；And the capacity retention ratio of the lithium ion battery obtained by mode and the mixed shelves probabilistic consistency of sorting are preferable through the invention.
Claims (1)
1. a kind of method of test lithium ion battery self discharge, it is characterised in that：Ferrous phosphate lithium battery is adjusted in SOC states
After lower, under conditions of 55 DEG C, storage carries out open-circuit voltage test after 5 days to lithium ion battery, and is denoted as OCV1；Second step,
By the lithium ion battery after test again under conditions of 60 DEG C, storage carries out open-circuit voltage test after 3 days to lithium ion battery, and
It is denoted as OCV2；Third walks, and by calculation formula △ V=OCV1-OCV2, calculates △ V, and be selected from and put for a class with 3mV
Electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510367998.3A CN104950264B (en) | 2015-06-26 | 2015-06-26 | The method for testing lithium ion battery self discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510367998.3A CN104950264B (en) | 2015-06-26 | 2015-06-26 | The method for testing lithium ion battery self discharge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104950264A CN104950264A (en) | 2015-09-30 |
| CN104950264B true CN104950264B (en) | 2018-10-23 |
Family
ID=54165062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510367998.3A Active CN104950264B (en) | 2015-06-26 | 2015-06-26 | The method for testing lithium ion battery self discharge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104950264B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105785277B (en) * | 2016-03-25 | 2019-01-29 | 北京新能源汽车股份有限公司 | Screening method of power battery |
| CN106824831A (en) * | 2016-12-19 | 2017-06-13 | 金同林 | A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity |
| 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 |
| 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 |
| CN109212427A (en) * | 2017-07-09 | 2019-01-15 | 深圳格林德能源有限公司 | A kind of polymer Li-ion battery self discharge screening technology |
| CN108160531B (en) * | 2018-03-15 | 2021-04-09 | 惠州亿纬锂能股份有限公司 | Battery self-discharge sorting method |
| CN110221227B (en) * | 2019-05-31 | 2022-01-14 | 上海动力储能电池系统工程技术有限公司 | Method for evaluating state consistency of single batteries in battery module |
| CN110632529A (en) * | 2019-10-08 | 2019-12-31 | 湖南华兴新能源科技有限公司 | Lithium battery self-discharge testing process |
| CN112698227B (en) * | 2020-11-24 | 2022-12-02 | 合肥国轩高科动力能源有限公司 | Lithium ion battery self-discharge abnormity screening method |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5321783B2 (en) * | 2008-03-04 | 2013-10-23 | 株式会社東芝 | Nonaqueous electrolyte secondary battery and battery pack |
| CN102760907B (en) * | 2011-04-29 | 2014-07-02 | 广州丰江电池新技术股份有限公司 | Method for assembling rechargeable lithium battery pack |
| CN103208655A (en) * | 2013-03-04 | 2013-07-17 | 八叶(厦门)新能源科技有限公司 | Grouping method for power lithium ion batteries |
| CN104316877B (en) * | 2014-01-09 | 2017-12-05 | 中航锂电（江苏）有限公司 | A kind of self discharge detection method of ferric phosphate lithium cell |
| 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 |
-
2015
- 2015-06-26 CN CN201510367998.3A patent/CN104950264B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104950264A (en) | 2015-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104950264B (en) | The method for testing lithium ion battery self discharge | |
| CN104979597B (en) | The method of lithium ion battery self discharge | |
| CN110165319B (en) | Sorting method for self-discharge performance of high-capacity lithium battery | |
| CN109586373A (en) | A kind of method for charging batteries and device | |
| CN104062594B (en) | Lithium-ion-power cell method for group matching | |
| CN106824831A (en) | A kind of manufacture method of the motive-power battery for improving lithium ion battery uniformity | |
| CN105070963B (en) | The optimization method of high-multiplying power lithium ion battery SEI films | |
| CN106384853B (en) | A kind of chemical conversion of lithium ion battery substep and conformity classification method | |
| CN103579700B (en) | A kind of lithium ion battery sorting method for group matching | |
| CN104991197A (en) | Lithium iron phosphate lithium ion battery self-discharge test method | |
| CN104668207A (en) | Method for enhancing screening consistency of lithium-ion power battery | |
| CN110726940B (en) | Method for rapidly evaluating cycle performance of high-nickel cathode material of lithium ion battery | |
| CN102508165A (en) | Method for evaluating self-discharge consistency of lithium iron phosphate battery | |
| CN111999666B (en) | Quantitative test method for diffusion impedance of lithium ion battery cell | |
| CN105703022B (en) | A kind of lithium-ion-power cell charging method based on temperature control cell decay | |
| CN107607874A (en) | The bikini screening technique of quick charge/discharge lithium ion battery | |
| CN106997960A (en) | A kind of chemical conversion of lithium ion battery, partial volume method | |
| CN104269574A (en) | Battery pack sorting method | |
| CN105322245A (en) | Charging method for improving charging efficiency of lithium ion battery | |
| CN107422265A (en) | A kind of detection method of cell uniformity | |
| CN105044616A (en) | Lithium battery detection method | |
| CN109581234A (en) | A kind of lithium ion battery conformity classification method | |
| CN108511823A (en) | A kind of lithium ion battery self discharge SOC state screening techniques | |
| CN207852740U (en) | A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency | |
| CN104259112A (en) | Lithium ion battery screening method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |