CN102393509A - Nondestructive evaluation method for performance of lithium ion battery - Google Patents
Nondestructive evaluation method for performance of lithium ion battery Download PDFInfo
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- CN102393509A CN102393509A CN2011102994037A CN201110299403A CN102393509A CN 102393509 A CN102393509 A CN 102393509A CN 2011102994037 A CN2011102994037 A CN 2011102994037A CN 201110299403 A CN201110299403 A CN 201110299403A CN 102393509 A CN102393509 A CN 102393509A
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Abstract
The invention discloses a method for quickly and simply evaluating and sorting the performance of a single lithium ion battery or battery pack and ensuring an accurate result. The method comprises the following steps of: taking a complete charge/discharge process of the lithium ion battery or battery pack in a capacity grading process, and recording the constant-current charge time and the constant-voltage charge time in the charge process; dividing the constant-current charge time by the constant-voltage charge time to obtain a ratio that is called as a constant current-constant voltage time ratio; and comparing the ratio with a determined sorting standard value of the lithium ion battery or battery pack, wherein if the ratio is less than the standard value, the performance of the battery is unqualified; and the determined grading standard value of the constant current-constant voltage time ratio of the lithium ion battery or battery pack takes a value below average or a dense area as a lower limit of the standard value according to a measured distribution result of the constant current-constant voltage time ratio of the battery or battery pack of each type. The method disclosed by the invention is quick and simple and easy to operate, and is a novel evaluation method for assessing and sorting the performance of a battery or battery pack without influencing the performance of the battery or battery pack.
Description
Technical field:
The present invention relates to lithium-ion battery monomer or battery performance evaluation areas, more particularly, relate to lithium-ion battery monomer or electric battery Performance Evaluation and the battery sorting method after the partial volume operation is accomplished.
Background technology:
At present, one step of partial volume can be arranged all in the power lithium-ion battery manufacture craft, partial volume then generally adopts traditional first constant current constant voltage (CC-CV) charging modes again.In this mode; Constant-current phase adopts fixing low range electric current that battery is charged; When reaching charging voltage higher limit (being generally 4.2V); Convert the mode of constant voltage and current limiting again into, keep the constant charging current that progressively reduces of charging voltage, reduce to enough little (being generally 0.05C) to charging current and then accomplish charging process.Through behind the partial volume, battery also will pass through cell degradation, and internal resistance, voltage tester are confirmed the battery performance quality at last.That the method for this traditional test battery performance exists is consuming time, the shortcoming of consumption manpower, demands urgently improving and solving.
Lithium ion battery is in charge and discharge process, and lithium ion will pass through the transmission course in graphite cathode particle, electrolytic solution, three kinds of materials of positive electrode particle.In the battery charging process; Chemical polarization, ohmic polarization and concentration polarization all can show in constant-current charging of battery time and constant voltage charging time, and along with the constant-current charge time lengthening, the battery concentration polarization increases; Cell voltage raises; Get into the constant-voltage charge process then, constant-current charge time and constant voltage charging time influence the battery termination capacity jointly, and the battery polarization power has been reacted the size of the internal resistance of cell; The big cycle performance of battery that polarizes is poor, and the duration of charging has been reacted the electric current ability to accept in the battery charging process.Thereby constant-current charge time and constant voltage charging time can reflect the battery performance situation.
The factor of general evaluation and test battery performance comprises: battery capacity, and the internal resistance of cell, cell voltage and cycle performance of battery, the proposition of constant current-constant voltage time ratio provides a kind of new approach for assessment lithium ion battery performance, and this method is simple to operate, reliable results.Through measuring the time ratio of lithium ion battery constant current-constant-voltage charge process, confirm whether battery performance is good,, say so on the principle and assess battery performance than sorting battery according to different constant current-constant voltage charging times from the battery polarization situation.
Summary of the invention:
The problem that the present invention need solve is to lithium ion battery a kind of simple, assessment result lithium-ion battery monomer or battery performance method accurately to be provided.
Performance estimating method behind lithium-ion battery monomer of the present invention or the electric battery partial volume; Carry out according to following step: in lithium ion single battery or electric battery after partial volume is accomplished; Power taking pond constant-current charge time and constant voltage charging time; With the constant-current charge time divided by constant voltage charging time, obtain a ratio;
Then the lithium ion battery of above-mentioned gained or the constant-current charge time of electric battery are compared with lithium ion battery or the electric battery sorting standard value confirmed with the ratio of constant voltage charging time; Ratio is less than standard value; Then this lithium ion battery or electric battery are defective, and its internal resistance of cell, cell emf and cycle performance are undesirable; Ratio overgauge value, lithium ion battery or electric battery are qualified, and its internal resistance of cell, cell emf and cycle performance meet the requirements.
Said definite lithium ion battery or the constant-current charge time of electric battery and the ratio standard value of constant voltage charging time; Be according to each size battery or electric battery after partial volume is accomplished; The constant-current charging of battery time behind the internal resistance of difference test battery or electric battery, voltage, the cycle performance and the measurement distribution results of constant voltage charging time ratio, the lower middle value or the densely distributed district of getting wherein are the standard value lower limit.
Description of drawings:
Fig. 1 is the statistical Butut of constant current-constant voltage charging time ratio and discharge capacity of the cell behind the embodiment of the invention 1800mAh lithium ion battery partial volume
Fig. 2 is the statistical Butut of constant current-constant voltage charging time ratio and the internal resistance of cell behind the embodiment of the invention 1800mAh lithium ion battery partial volume
Embodiment
Below in conjunction with embodiment the present invention is further specified.
Embodiment 1: the new assessment method of lithium ion battery of the present invention is applied to the cell that certain capacity is 1.8Ah; Calculate in 100 cell partial volume processes the ratio of constant-current charge time and constant voltage charging time in second cycle charging process respectively, and measure the internal resistance and the voltage of these 100 batteries in order, its measurement result is through after statistical study; With constant current-constant voltage charging time ratio is the X axle; Discharge capacity and internal resistance are the Y axle, and mapping respectively obtains accompanying drawing 1 and accompanying drawing 2.
Under normal circumstances; The constant-current charge time of battery and constant voltage charging time ratio distribute and are dispersed within the less scope; Comparison diagram through doing ratio and internal resistance and ratio and voltage can find out that the internal resistance of cell and constant current-constant voltage charging time ratio has certain relation, though be not linear relationship completely; But can find out that constant current-constant voltage charging time ratio to a certain degree can assess battery performance, can carry out sorting to electric battery according to this ratio.
Confirm the sorting standard value of lithium ion battery or electric battery, the lower middle value or the densely distributed district of getting wherein are that the standard value lower limit (illustrates, sees accompanying drawing 4; The battery of 100 4.05V/1.8Ah is full of electricity, after branch holds cabinet, measures the internal resistance of cell; Its ratio distributes and is 2.5 to the maximum, and minimum is 0.8, and is most of at 1.4-2.5; Be standard value lower limit value so choose 1.4) specifically: after partial volume is accomplished (the partial volume process adopts identical work step), select wherein 100 batteries at certain a battery, add up the constant current-constant voltage charging time ratio of these 100 batteries; Between getting wherein on the lower side value or densely distributed district be the standard value lower limit, promptly 1.4 are the sorting standard value, other constant currents-constant voltage charging time is than greater than 1.4 battery; Performance is qualified, and constant current-constant voltage charging time ratio is less than 1.4 battery, performance inconsistency lattice.
Claims (6)
1. lithium-ion battery monomer or electric battery accomplish at partial volume that the back is assessed battery performance and the method for sorting battery, it is characterized in that carrying out according to following step:
After lithium ion single battery or the completion of electric battery partial volume, note constant-current charging of battery time and constant voltage charging time respectively;
With the constant-current charge time divided by constant voltage charging time, obtain a ratio, claim that this ratio is constant current-constant voltage charging time ratio;
Calculate the constant current-constant voltage charging time ratio of a plurality of batteries;
Whether qualified with reference to predefined constant current-constant voltage charging time than definite battery performance, if the constant current-constant voltage time of calculating gained is otherwise defective than overgauge value then battery performance is qualified.
2. the lithium ion battery partial volume process according to claim 1 comprises:
In battery manufacturing process, utilize the automatic inspection device of lithium ion battery under different multiplying, lithium ion battery to be discharged and recharged according to demands of different, press discharge capacity of the cell size sorting battery;
Utilize time and battery terminal voltage, the electric current of the battery of flowing through and the capacity of battery in the automatic inspection device record of the lithium ion battery charge and discharge process;
And handle lithium ion battery partial volume process with the identical or similar mode of automatic inspection device.
3. the lithium ion single battery constant current-constant voltage charging time ratio according to claim 1 calculates gained by following step:
In battery partial volume process, utilize the work step time in the battery charge and discharge process of the automatic inspection device of lithium ion battery record, calculate constant-current charge time and constant voltage charging time in the charging process respectively;
Use constant-current charge time in the charging process divided by constant voltage charging time then, obtain a ratio, be called constant current-constant voltage charging time ratio.
4. the step according to the standard value of the definite constant current-constant voltage charging time ratio of claim 1 is following:
In process of production; After the partial volume work step of a certain model lithium ion battery is accomplished; And the internal resistance of test battery, voltage, cycle performance are qualified, the distribution results of the constant current-constant voltage charging time ratio of statistics battery, and the lower middle value or the densely distributed district of getting wherein are standard value.
5. the method according to definite lithium ion battery performance of claim 1 comprises following steps:
After partial volume is accomplished, calculate the constant current-constant voltage charging time ratio of a plurality of lithium ion single batteries respectively;
Then with the constant current of calculating gained-constant voltage charging time than and the lithium ion battery sorting standard value confirmed relatively, when ratio less than standard value, then this lithium ion battery is defective; Ratio overgauge value, lithium ion battery or electric battery are qualified.
6. the lithium ion battery group performance estimating method according to claim 1 comprises:
A plurality of lithium ion battery Performance Evaluations;
Be used for a plurality of lithium ion batteries are carried out the device of partial volume and recording cell constant-current constant-voltage charging time;
And, utilize this ratio to confirm the method for battery performance according to the constant-current constant-voltage charging Time Calculation constant current-constant voltage charging time ratio that writes down.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135063A (en) * | 2012-12-21 | 2013-06-05 | 郝勇 | Detection and monitoring method of lead-acid storage battery |
| CN104198949A (en) * | 2014-09-09 | 2014-12-10 | 上虞安卡拖车配件有限公司 | Battery health state detection method |
| CN104569847A (en) * | 2015-01-28 | 2015-04-29 | 国网冀北电力有限公司电力科学研究院 | Lithium battery performance evaluation method and device |
| CN113466708A (en) * | 2021-07-27 | 2021-10-01 | 上海纳米技术及应用国家工程研究中心有限公司 | Method for evaluating low-temperature performance of lithium battery |
| WO2024063577A1 (en) * | 2022-09-22 | 2024-03-28 | 주식회사 엘지에너지솔루션 | Battery diagnosis device and method |
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| CN104569847A (en) * | 2015-01-28 | 2015-04-29 | 国网冀北电力有限公司电力科学研究院 | Lithium battery performance evaluation method and device |
| CN113466708A (en) * | 2021-07-27 | 2021-10-01 | 上海纳米技术及应用国家工程研究中心有限公司 | Method for evaluating low-temperature performance of lithium battery |
| WO2024063577A1 (en) * | 2022-09-22 | 2024-03-28 | 주식회사 엘지에너지솔루션 | Battery diagnosis device and method |
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Application publication date: 20120328 |