CN108508365A - A kind of lithium ion battery self discharge screening technique - Google Patents
A kind of lithium ion battery self discharge screening technique Download PDFInfo
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- CN108508365A CN108508365A CN201710246912.0A CN201710246912A CN108508365A CN 108508365 A CN108508365 A CN 108508365A CN 201710246912 A CN201710246912 A CN 201710246912A CN 108508365 A CN108508365 A CN 108508365A
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Abstract
The present invention relates to technical field of lithium ion, more particularly, to a kind of lithium ion battery self discharge screening technique comprising charge to full power state, shelve processing, draw voltage and time square root curve, matched curve, the digital simulation slope of curve and judgement.Self discharge screening technique self discharge screening time section in the present invention, can greatly shorten the process time；Self discharge screening technique screening discrimination and precision in the present invention is higher, can Effective selection go out the lithium ion battery of self discharge exception.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly, to a kind of lithium ion battery self discharge screening technique.
Background technology
With the development of science and technology with the raising of people's environmental consciousness, develop the electric vehicle using electricity as power source to replace
Existing fuel-engined vehicle has become a kind of inevitable trend, and as the core component of electric vehicle -- its importance of power battery
Seem especially prominent.
Lithium-ion-power cell becomes for electric vehicle because of the features such as its energy density is high, self discharge is small, service life is long
The key object of power battery research and development.
Prospect of EVS Powered with Batteries needs multiple capacity are small, voltage is low single battery by way of series/parallel
It is combined into the battery pack that capacity is high, voltage is high, the consistent gender gap of single battery directly determines the performance of battery pack.Self discharge
As one of the biggest factor for influencing the battery combination backpack body service life, if self discharge is inconsistent, when serial number is more, battery pack
The SOC state differences of battery of often being gone here and there between body become larger, and the probability for super-charge super-discharge occur is very big, and backpack body, which is generally difficult to worry along 100 times, to follow
Otherwise ring uses the equal balance system of expensive BMS.Currently, judging that the parameter of battery consistency mainly has internal resistance, voltage
The self-discharge rate etc. of difference, capacity difference and battery, wherein first three parameter are all easy to obtain relatively, and the self-discharge rate of battery is main
It is characterized with voltage difference in the unit interval.
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.Battery is in Charging state since battery core expansion micro-short circuit can show
It is obvious that and electric discharge state may be due to the contraction of battery core, micro-short circuit is also decreased or is disappeared.
In the prior art, battery is charged to full electricity using in lithium ion battery formation process（100%SOC）, extension shelves
Time, the voltage of record each time point battery when shelving choose the corresponding voltage value of particular point in time or voltage in the unit interval
Foundation of the critical value of variation as screening self discharge；But this screening technique, there are apparent defect, one is when shelving
Between it is long, time-consuming, although secondly be that this method battery bigger than normal to self discharge can be screened preferably, for from
The smaller battery of electric discharge, discrimination and precision are all poor, it is difficult to be screened.
Invention content
To solve the above problems, the present invention provides a kind of screening take short, screening discrimination and the high lithium of precision from
Sub- self-discharge of battery screening technique.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of lithium ion battery self discharge screening technique, includes the following steps：
1）Lithium ion battery after chemical conversion is charged into full power state, is then shelved；
2）Record the corresponding voltage value of each time point during shelving；
3）By the voltage value of record and corresponding time point-rendering voltage and time square root scatter plot（As shown in Figure 1）, and
Linear fit will be carried out, fitting a straight line is made；
4）Digital simulation slope of a curve（As shown in Figure 1）；
5）It determines the slope range of the matched curve for the self discharge normal battery that the same period shelves, and judges that matched curve slope is less than
The lithium ion battery of the slope range is abnormal battery.
Normal battery/battery core, which carries out self discharge, which shelves the voltage of acquisition and time square root scatter plot, can carry out Linear Quasi
Close the straight line for obtaining that a slope is constant；And abnormal battery carries out the voltage and time square root scatterplot that acquisition is shelved in self discharge
Constantly change for slope after figure fitting（Typically constantly reduce）Curve either slope be more than normal range (NR) curve；
Thus difference can with fast resolution and judge test battery/battery core consistency.Utilize the self discharge screening technique in the present invention
The bad battery of consistency is screened, since the battery of test has differences, the calibration slope as basis for estimation exists corresponding
Difference, specific test method（Such as shelve processing time, charge cutoff electric current）It is also required to carry out certain adjustment.
Preferably, in step 1, elder generation's constant-current charge is to the end of charge voltage of lithium ion battery when charging, constant pressure later
Charging modes charge to electric current and are reduced to 0.1~0.05C.
Preferably, in step 1, shelves processing and carry out at normal temperatures.
Preferably, it is 1~30 day to shelve the time.
Preferably, corresponding voltage value is the voltage value every a hour record after shelving beginning.
Preferably, lithium ion battery is nickle cobalt lithium manganate ternary lithium ion battery or ferric phosphate lithium ion battery.
Therefore, the invention has the advantages that：
（1）Self discharge screening technique self discharge screening time section in the present invention, can greatly shorten the process time；
（2）Self discharge screening technique screening discrimination and precision in the present invention be higher, can Effective selection to go out self discharge abnormal
Lithium ion battery.
Description of the drawings
Fig. 1 is normal lithium ion battery voltage-time square root data graphs of discharging；
Fig. 2 is test lithium-ion electric tank discharge-time square root data graphs；
Fig. 3 is test lithium-ion electric tank discharge-time square single data derivation curve graph.
Specific implementation mode
Technical scheme of the present invention is further described With reference to embodiment.
Obviously, the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, all other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Embodiment
Using nickle cobalt lithium manganate ternary lithium ion battery as screening object in the present embodiment.
Normal cell and its corresponding self discharge curve judge test lithium ion battery cell 1 and battery core 2 as judgment criteria
It is normal whether.
A kind of lithium ion battery self discharge screening technique, includes the following steps：
1）By lithium ion battery cell 1, battery core 2 and the normal cell charging after chemical conversion, first constant-current charge to lithium ion battery
End of charge voltage, that is, 4.2V, later constant voltage charging method charge to electric current and be reduced to 0.1C, then carried out at 25 DEG C of room temperature
Processing is shelved, it is 10 days to shelve processing time；
2）It shelves after starting every the corresponding voltage value of a hour record；
3）By the voltage value of record and corresponding time point-rendering voltage and time square root scatter plot, and curve is intended
It closes, matched curve is made；The matched curve of self discharge normal battery is drawn simultaneously, and the self discharge curve of normal cell is linear
Straight line, and determine normal battery discharge-time square root slope of a curve range, as shown in Figure 1；Battery core 1 and electricity are drawn again
The battery discharge of core 2-time square root curve
4）Digital simulation slope of a curve；Due to being the excessive abnormal battery of two self discharges shown in embodiment, so voltage
Acquisition curve with the fitting of time square root scatterplot is not a linearity curve, therefore its slope is not constant, but not
Disconnected variation；As shown in Fig. 2, the slope of the matched curve obtained by two battery core parameters constantly reduces, then to curve shown in Fig. 2
Derivation is carried out, lithium-ion electric tank discharge-time square single data derivation curve as shown in Figure 3 is made；
5）According to fig. 3 it can be seen that abnormal battery quickly reduces with the slope for shelving increases of time its response curve, difference
In normal battery, so far judge battery core 1 and battery core 2 for abnormal battery.
It should be understood that those skilled in the art, can be improved or be become according to the above description
It changes, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (6)
1. a kind of lithium ion battery self discharge screening technique, it is characterised in that include the following steps：
1）Lithium ion battery after chemical conversion is charged into full power state, is then shelved；
2）Record the corresponding voltage value of each time point during shelving；
3）By the voltage value of record and corresponding time point-rendering voltage and time square root scatter plot, and Linear Quasi will be carried out
It closes, fitting a straight line is made；
4）The slope of digital simulation straight line；
5）It determines the slope range of the matched curve for the self discharge normal battery that the same period shelves, and judges that matched curve slope is less than
The lithium ion battery of the slope range is abnormal battery.
2. a kind of lithium ion battery self discharge screening technique according to claim 1, it is characterised in that：
In the step 1, elder generation's constant-current charge to the end of charge voltage of lithium ion battery, later constant voltage charging method fills when charging
Electricity to electric current is reduced to 0.1~0.05C.
3. a kind of lithium ion battery self discharge screening technique according to claim 1, it is characterised in that：
In the step 1, shelves processing and carry out at normal temperatures.
4. a kind of lithium ion battery self discharge screening technique according to claim 1, it is characterised in that：
The time of shelving is 1~30 day.
5. a kind of lithium ion battery self discharge screening technique according to claim 1, it is characterised in that：
The corresponding voltage value is the voltage value every a hour record after shelving beginning.
6. a kind of lithium ion battery self discharge screening technique according to claim 1, it is characterised in that：
The lithium ion battery is nickle cobalt lithium manganate ternary lithium ion battery or ferric phosphate lithium ion battery.
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Cited By (9)
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| CN110488201A (en) * | 2019-07-03 | 2019-11-22 | 浙江锋锂新能源科技有限公司 | A kind of charge states of lithium ion battery electric discharge screening technique, system, storage medium |
| CN113219361A (en) * | 2021-03-16 | 2021-08-06 | 上海派能能源科技股份有限公司 | Lithium ion battery pack abnormal self-discharge diagnosis method and system based on time-sharing regression distribution |
| 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 |
| CN113552487A (en) * | 2021-06-24 | 2021-10-26 | 武汉昊诚锂电科技股份有限公司 | Self-discharge measurement and service life evaluation method of lithium secondary battery |
| CN113985287A (en) * | 2021-10-19 | 2022-01-28 | 安徽明德源能科技有限责任公司 | Battery cell safety identification method and device |
| CN114184969A (en) * | 2021-12-08 | 2022-03-15 | 蜂巢能源科技(无锡)有限公司 | Method and device for testing reversible self-discharge capacity loss of battery cell |
| CN114200329A (en) * | 2021-12-10 | 2022-03-18 | 合肥国轩高科动力能源有限公司 | Abnormal battery screening method based on formation curve characteristics |
| CN114430080A (en) * | 2022-01-27 | 2022-05-03 | 中国汽车工程研究院股份有限公司 | Power battery cell abnormal self-discharge identification method based on operation data |
| WO2023201532A1 (en) * | 2022-04-19 | 2023-10-26 | 宁德时代新能源科技股份有限公司 | Abnormal battery cell identification method and apparatus, electronic device, and storage medium |
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| CN113219361A (en) * | 2021-03-16 | 2021-08-06 | 上海派能能源科技股份有限公司 | Lithium ion battery pack abnormal self-discharge diagnosis method and system based on time-sharing regression distribution |
| CN113219361B (en) * | 2021-03-16 | 2024-02-27 | 上海派能能源科技股份有限公司 | Abnormal self-discharge diagnosis method and system for lithium ion 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 |
| CN113552487A (en) * | 2021-06-24 | 2021-10-26 | 武汉昊诚锂电科技股份有限公司 | Self-discharge measurement and service life evaluation method of lithium secondary battery |
| CN113985287A (en) * | 2021-10-19 | 2022-01-28 | 安徽明德源能科技有限责任公司 | Battery cell safety identification method and device |
| CN114184969A (en) * | 2021-12-08 | 2022-03-15 | 蜂巢能源科技(无锡)有限公司 | Method and device for testing reversible self-discharge capacity loss of battery cell |
| CN114184969B (en) * | 2021-12-08 | 2023-11-28 | 蜂巢能源科技(无锡)有限公司 | Method and device for testing reversible self-discharge capacity loss of battery cell |
| CN114200329A (en) * | 2021-12-10 | 2022-03-18 | 合肥国轩高科动力能源有限公司 | Abnormal battery screening method based on formation curve characteristics |
| CN114430080A (en) * | 2022-01-27 | 2022-05-03 | 中国汽车工程研究院股份有限公司 | Power battery cell abnormal self-discharge identification method based on operation data |
| CN114430080B (en) * | 2022-01-27 | 2022-07-29 | 中国汽车工程研究院股份有限公司 | Power battery cell abnormal self-discharge identification method based on operation data |
| WO2023201532A1 (en) * | 2022-04-19 | 2023-10-26 | 宁德时代新能源科技股份有限公司 | Abnormal battery cell identification method and apparatus, electronic device, and storage medium |
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