CN108511823A - A kind of lithium ion battery self discharge SOC state screening techniques - Google Patents
A kind of lithium ion battery self discharge SOC state screening techniques Download PDFInfo
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- CN108511823A CN108511823A CN201710246913.5A CN201710246913A CN108511823A CN 108511823 A CN108511823 A CN 108511823A CN 201710246913 A CN201710246913 A CN 201710246913A CN 108511823 A CN108511823 A CN 108511823A
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- lithium ion
- ion battery
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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
- H01M10/446—Initial charging measures
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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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Abstract
The present invention relates to technical field of lithium ion.The invention discloses a kind of lithium ion battery self discharge SOC state screening techniques comprising SOC OCV Drawing of Curve, dV/dQ Drawing of Curve, shelve processing, record shelves each time point voltage value of processing, calculating and judges screening.The present invention accurately can quickly determine the best SOC states for self-discharge of battery screening；Self discharge can be differentiated in short period and cross big battery, shorten screening time；Screening discrimination and precision that big battery is crossed in self discharge can be improved.
Description
Technical field
The present invention relates to technical field of lithium ion, are screened more particularly, to a kind of lithium ion battery self discharge SOC states
Method.
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 it is a kind of can accurate quick best SOC states, and divide within a short period of time
Distinguish the lithium ion battery self discharge SOC state screening techniques of self-discharge battery.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of lithium ion battery self discharge SOC state screening techniques, include the following steps：
a）Test and draw the SOC-OCV curves of lithium ion battery；
b）DV/dQ curves are drawn in data derivation in the SOC-OCV curves obtained according to step a, and are determined according to the slope of curve
Best SOC ranges；
c）Lithium ion battery charging is adjusted within the scope of the best SOC obtained into step b, and carries out lay-down location reason；
d）Record shelves each time point corresponding voltage value in processing；
e）Period corresponding voltage difference or the voltage change in the unit interval are shelved in calculating；
f）Determine the big cell voltage difference of the self discharge that the same period shelves or in the unit interval voltage change critical value, judge electricity
The lithium ion battery that pressure difference or the voltage change in the unit interval are more than the critical value is abnormal battery.
Within the scope of best SOC, small SOC variations are responsible for quick voltage and decline, and examination rate and precision obtain
To being substantially improved；OCV falls are far longer than normal battery to the big battery of self discharge in a short time, can substantially shorten and put certainly
Electric screening time.
The present invention shelves processing by the way that the best SOC ranges of selection and within this range progress short time are effective, obtains phase
It closes data screening and judges the consistency of battery/battery core.Slope in dV/dQ curves is drawn in data derivation in SOC-OCV curves
Larger section is the maximum section of lithium ion battery battery bucklingization, and the most apparent section most easily observed, normal battery are
Make to be the voltage in this section（Open-circuit voltage）Changing value nor very big, but for abnormal battery, charge to
This section after shelving processing, goes the changing value of voltage larger, often exceeds critical value, may determine that the consistent of battery accordingly
Property.In the screening technique of the present invention, first rendered SOC-OCV curves and dV/dQ curves, judge best SOC ranges, and
Test battery and normal cell charging are adjusted into the same point to this SOC or the same voltage within the scope of this SOC,
Then carry out shelving processing, and the voltage value of record standard battery and test battery at regular intervals, finally carry out calculating and
Judge.
Preferably, in step b, shelves processing and carry out at normal temperatures.
Preferably, in step d, each time point be shelve after processing starts per every other hour.
Preferably, it is 1~30 day to shelve the time.
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）It accurately can quickly determine the best SOC states for self-discharge of battery screening；
（2）Self discharge can be differentiated in short period and cross big battery, shorten screening time；
（3）Screening discrimination and precision that big battery is crossed in self discharge can be improved.
Description of the drawings
Fig. 1 is the SOC-OCV curves for testing battery；
Fig. 2 is that test SOC-OCV data derivations obtain dV/dQ curves.
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.
Using the voltage value of corresponding time point normal battery/battery core as standard value, test battery/battery core is calculated when corresponding
Between put the difference of upper voltage value and standard value or in the unit interval voltage change critical value as self discharge basis for estimation.
A kind of lithium ion battery self discharge SOC state screening techniques, include the following steps：
a）Test and draw the SOC-OCV curves of lithium ion battery；As shown in Figure 1；
b）DV/dQ curves are drawn in data derivation in the SOC-OCV curves obtained according to step a, and are determined according to the slope of curve
Best SOC ranges；As shown in Fig. 2, mark place of drawing a circle, slope is maximum in whole curve, therefore voltage change in this region
Value is most apparent；Shown in Fig. 2, in this embodiment, SOC ranging from 2~8% is selected, the last voltage range of battery/battery core is
3.35~3.48V；
c）Lithium ion battery charging is adjusted within the scope of the best SOC obtained into step b, 3.48V is charged in the present embodiment,
And carry out shelving processing at 25 DEG C of room temperature, it is 2 days to shelve the time；
d）Record shelves each time point corresponding voltage value in processing；Time point chooses 1h, 6h, 12h, waits four time points for 24 hours；
It is followed successively by 3.48V, 3.4792V, 3.4789V, 3.4781V in the voltage value of above-mentioned time point normal battery, normal battery is in short-term
Interior voltage declines smaller；Above-mentioned time point test battery voltage value be followed successively by 3.48V, 3,4789V, 3.4753V,
Voltage drop-out value is larger in its short time of 3.4741V
e）Period corresponding voltage difference is shelved in calculating；
f）It determines the big cell voltage difference of the self discharge that the same period shelves or the critical value that ground voltage changes in the unit interval, judges
The lithium ion battery that voltage difference or the voltage change in the unit interval are more than the critical value is abnormal battery；By above-mentioned data
Comparing calculation can show that normal battery voltage drop-out value in 24 hours is 0.0019V, and drop-out value is relatively small, test electricity
Pond voltage drop-out value in 24 hours is 0.0059, and drop-out value is relatively large, considerably beyond ternary lithium battery 24 hours in voltage
The critical value of variation, accordingly method can quickly judge battery with two side terminals.
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 (5)
1. a kind of lithium ion battery self discharge SOC state screening techniques, it is characterised in that include the following steps：
a）Test and draw the SOC-OCV curves of lithium ion battery；
b）DV/dQ curves are drawn in data derivation in the SOC-OCV curves obtained according to step a, and are determined according to the slope of curve
Best SOC ranges；
c）Lithium ion battery charging is adjusted within the scope of the best SOC obtained into step b, and carries out lay-down location reason；
d）Record shelves each time point corresponding voltage value in processing；
e）Period corresponding voltage difference or the voltage change in the unit interval are shelved in calculating；
f）It determines the big cell voltage difference of the self discharge that the same period shelves or the critical value that ground voltage changes in the unit interval, judges
The lithium ion battery that voltage difference or the voltage change in the unit interval are more than the critical value is abnormal battery.
2. a kind of lithium ion battery self discharge SOC state screening techniques according to claim 1, it is characterised in that：
In the step b, shelves processing and carry out at normal temperatures.
3. a kind of lithium ion battery self discharge SOC state screening techniques according to claim 1, it is characterised in that：
In the step d, each time point be shelve after processing starts per every other hour.
4. a kind of lithium ion battery self discharge SOC state screening techniques 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 SOC state screening techniques 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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| CN201710246913.5A CN108511823A (en) | 2017-04-16 | 2017-04-16 | A kind of lithium ion battery self discharge SOC state screening techniques |
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| CN201710246913.5A CN108511823A (en) | 2017-04-16 | 2017-04-16 | A kind of lithium ion battery self discharge SOC state screening techniques |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111239625A (en) * | 2020-03-09 | 2020-06-05 | 天津市捷威动力工业有限公司 | SOC range selection method for self-discharge screening, storage medium and equipment |
| CN112379285A (en) * | 2020-10-30 | 2021-02-19 | 合肥国轩高科动力能源有限公司 | Battery pack self-discharge screening method |
| CN113917347A (en) * | 2021-09-30 | 2022-01-11 | 蜂巢能源科技有限公司 | Method for evaluating self-discharge standard of battery |
| CN114062952A (en) * | 2020-08-07 | 2022-02-18 | 泰星能源解决方案有限公司 | Insulation inspection method for secondary battery |
| 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 |
| CN117420457A (en) * | 2023-11-07 | 2024-01-19 | 江苏正力新能电池技术有限公司 | Consistency selection method and device for batteries |
| CN118589072A (en) * | 2024-06-20 | 2024-09-03 | 四川兴储能源科技有限公司 | A step-by-step long-cycle charging method for a single sodium-ion battery |
| WO2024217003A1 (en) * | 2023-04-20 | 2024-10-24 | 湖北亿纬动力有限公司 | Screening method and apparatus regarding self-discharge of lithium-ion batteries, and electronic device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111239625A (en) * | 2020-03-09 | 2020-06-05 | 天津市捷威动力工业有限公司 | SOC range selection method for self-discharge screening, storage medium and equipment |
| CN114062952A (en) * | 2020-08-07 | 2022-02-18 | 泰星能源解决方案有限公司 | Insulation inspection method for secondary battery |
| CN114062952B (en) * | 2020-08-07 | 2023-08-04 | 泰星能源解决方案有限公司 | Insulation inspection method for secondary battery |
| CN112379285A (en) * | 2020-10-30 | 2021-02-19 | 合肥国轩高科动力能源有限公司 | Battery pack self-discharge screening method |
| CN113917347A (en) * | 2021-09-30 | 2022-01-11 | 蜂巢能源科技有限公司 | Method for evaluating self-discharge standard of battery |
| 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 |
| WO2024217003A1 (en) * | 2023-04-20 | 2024-10-24 | 湖北亿纬动力有限公司 | Screening method and apparatus regarding self-discharge of lithium-ion batteries, and electronic device |
| CN117420457A (en) * | 2023-11-07 | 2024-01-19 | 江苏正力新能电池技术有限公司 | Consistency selection method and device for batteries |
| CN118589072A (en) * | 2024-06-20 | 2024-09-03 | 四川兴储能源科技有限公司 | A step-by-step long-cycle charging method for a single sodium-ion battery |
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Application publication date: 20180907 |