CN106772109A - A kind of method for separating of self-discharge of battery performance - Google Patents
A kind of method for separating of self-discharge of battery performance Download PDFInfo
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- CN106772109A CN106772109A CN201710145840.0A CN201710145840A CN106772109A CN 106772109 A CN106772109 A CN 106772109A CN 201710145840 A CN201710145840 A CN 201710145840A CN 106772109 A CN106772109 A CN 106772109A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The invention discloses a kind of method for separating of self-discharge of battery performance.The method for separating includes：To start to stand after battery discharge after partial volume to blanking voltage, measurement stands the burning voltage V0 after the first duration；Start to stand after the battery is charged into setting state, measurement stands the medium voltage V1 after the second duration；The battery is continued standing under design temperature environment, measurement stands the final voltage V2 after the 3rd duration；Calculate self-discharge rate △=(V1 V2)/(the V1 V0) of the battery, the grade of the battery is judged according to self-discharge rate △ and standard value, by the capacity that very little is filled with to battery, so that in certain capacity threshold, the voltage and capacity of battery are in certain proportion relation, so as to change can just realize that efficient self discharge is tested by simple material flow line.
Description
Technical field
The present invention relates to rechargeable battery technical field, more particularly to a kind of method for separating of self-discharge of battery performance.
Background technology
When self-discharge of battery refers to that battery is idle not to be used, also can loss of electricity phenomenon.The main cause of self discharge
It is that inside battery there occurs irreversible reaction, so as to cause the loss of battery capacity.Mainly include：Both positive and negative polarity and electrolyte
There is irreversible reaction, electrolyte itself irreversible reaction that causes with impurity of institute and the impurity of introducing is caused in manufacturing process
Micro-short circuit and irreversible reaction for causing etc..When connection in series-parallel is powered for circuit together for these abnormal batteries and normal battery,
Often cause the hydraulic performance decline and unstability of whole group power supply circuit.It is therefore desirable to the higher battery of those self discharges is screened
Out, processed as off standard.The difficulty of self discharge exception battery screening is this phenomenon in the battery of short time is shelved
It is often unobvious.
By taking ferric phosphate lithium cell as an example, its normal self-discharge rate is 1%/moon, even if abnormal battery self-discharge rate reaches
2%/moon.Also tend to due to test equipment limited precision, this 1% and 2% difference is often ignored.And normally produce
The technical process of battery, often cannot guarantee that battery is shelved more than 1 month in time.From figure 1 it appears that ferric phosphate
The charge and discharge platform curvature very little of lithium, even if battery releases a large amount of capacity, the voltage change of battery is much smaller than other materials on year-on-year basis
Material.Therefore find in a short time, the detection method of battery self discharge rate can be amplified, be self discharge of lithium iron phosphate battery attribute
One problem of screening.
The content of the invention
The invention provides a kind of method for separating of self-discharge of battery performance, ferric phosphate lithium cell in the prior art is solved
Not accurate enough the problem of self discharge attribute selection.
To realize above-mentioned design, the present invention uses following technical scheme：
A kind of method for separating of self-discharge of battery performance, including：
To start to stand after battery discharge after partial volume to blanking voltage, measurement stands the burning voltage after the first duration
V0；
Start to stand after the battery is charged into setting state, measurement stands the medium voltage V1 after the second duration；
The battery is continued standing under design temperature environment, measurement stands the final voltage V2 after the 3rd duration；
Self-discharge rate △=(V1-V2)/(V1-V0) of the battery is calculated, is judged according to self-discharge rate △ and standard value
The grade of the battery.
Wherein, it is described the battery to be charged to start after setting state stand, specially：
Battery is charged to using 0.02C-0.1C start after less than 5% remaining capacity SOC (State of Charge) it is quiet
Put.
Wherein, the grade that the battery is judged according to self-discharge rate △ and standard value, specially：
According to the first duration, setting state, the second duration, design temperature environment, the 3rd duration validation criteria value；
The self-discharge rate △ correspondence standard values are confirmed the grade of the battery.
Wherein, described first when it is a length of 4-16 hours.
Wherein, described second when it is a length of 1-5 hours.
Wherein, the described 3rd when a length of 5-15 days.
Wherein, the blanking voltage is 2.0-3.0V.
Wherein, the design temperature is 15-60 DEG C.
Wherein, the design temperature is 25 DEG C.
Wherein, the battery is ferric phosphate lithium cell.
Beneficial effects of the present invention are：To start to stand after battery discharge after partial volume to blanking voltage, measurement stands the
Burning voltage V0 after one duration；Start to stand after the battery is charged into setting state, after measurement stands the second duration
Medium voltage V1；The battery is continued standing under design temperature environment, measurement stands the final voltage V2 after the 3rd duration；
Self-discharge rate △=(V1-V2)/(V1-V0) of the battery is calculated, the battery is judged according to self-discharge rate △ and standard value
Grade, by the capacity that very little is filled with to battery so that in certain capacity threshold, the voltage and capacity of battery are in certain
Proportionate relationship, so as to change can just realize that efficient self discharge is tested by simple material flow line.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, institute in being described to the embodiment of the present invention below
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also implement according to the present invention
The content and these accompanying drawings of example obtain other accompanying drawings.
Fig. 1 is the charge/discharge rates curvature schematic diagram of ferric phosphate lithium cell；
Fig. 2 is a kind of method flow of the method for separating of self-discharge of battery performance of offer in the specific embodiment of the invention
Figure；
Fig. 3 is capacity and voltage relationship figure.
Specific embodiment
Further to illustrate the present invention to reach technological means and effect that predetermined goal of the invention is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to specific embodiment, the spy of the method for separating according to self-discharge of battery performance proposed by the present invention
Levy and its effect, describe in detail as after.
Refer to Fig. 2 and Fig. 3, Fig. 2 be a kind of self-discharge of battery performance for providing in the specific embodiment of the invention point
The method flow diagram of choosing method；Fig. 3 is capacity and voltage relationship figure.As shown in Fig. 2 the sorting side of the self-discharge of battery performance
Method, including：
Step S101：To start to stand after battery discharge after partial volume to blanking voltage, after measurement stands the first duration
Burning voltage V0.
Step S102：Start to stand after battery is charged into setting state, measurement stands the medium voltage after the second duration
V1。
In actual operating process, a change is applied to the self-discharge processes of battery by micro- filling, for example, used
Battery is charged to less than 5% remaining capacity SOC by 0.02C-0.1C, and subsequent detection is carried out on the basis of this charged state.
Step S103：Battery is continued standing under design temperature environment, measurement stands the final voltage after the 3rd duration
V2。
Step S104：Self-discharge rate △=(V1-V2)/(V1-V0) of battery is calculated, according to self-discharge rate △ and standard value
Judge the grade of battery.
Test parameter during sorting is different, and the standard value for being judged is different, in particular, it is desirable to according to the first duration,
Setting state, the second duration, design temperature environment, the 3rd duration validation criteria value；Then by self-discharge rate △ correspondence standard values
Confirm the grade of battery.
In the interval more than 5%SOC, because the slope of curve is too small, the volume change that self discharge causes can not be by voltage
Change effectively shows.It is all only in interval less than 5%, capacity and voltage show the change of more rule,
Self discharge size can be effectively assessed by pressure drop.But for ferric phosphate lithium cell, due to<0.5%SOC is interval
Inner capacities is less, and voltage carries out the rate of decay comparatively fast with self-discharge of battery, is likely to result in self-discharge rate △ values and is much larger than
100% situation.If the self-discharge rate △ of conventional batteries and the big battery testing of self discharge is more than 100%, may be due to
The rapid decrease of voltage even up big battery and conventional batteries the pressure drop difference of self discharge, it is necessary to relative reduction storage when
Between.
There is individual difference in the battery of batch production, the slope of the voltage/capacity under different SOC is differed.When one
Cell voltage/capacity ratio exists<5%SOC is interval, and another is in the interval of ＞ 5%SOC.In the case of identical self discharge, if
Using the pressure difference △ V before and after self discharge as self discharge index, then can be because<5%SOC intervals △ V it is bigger than normal and cause erroneous judgement.From Fig. 3
In it can be seen that under 0.5%, 2.5% and 5% SOC, the capacity of decay 0.5% has corresponded to 10mV, 20mV and 100mV respectively
Pressure drop.Even if illustrating<Under the conditions of same SOC in 5%SOC intervals, if using △ V as self discharge index, also due to
Battery inconsistent and cause certain deviation.The present invention is passed through by way of self-discharge rate △=(V1-V2)/(V1-V0)
Contrast self discharge attenuation ratio can more accurately judge self discharge size, particularly with the sorting of ferric phosphate lithium cell battery
There is good result.The method for accelerating self discharge in 5-15 days is deposited relative to high temperature, the present invention need not increase high temperature storage operation,
The difficulty of test is only greatly reduced by way of normal temperature charges storage.Deposited 30 days relative to conventional normal temperature, by k
Value judges the mode of self-discharge of battery, greatly shortens time and the testing efficiency of inspection.This method is applied to battery in batches
The test link of production, being changed by simple material flow line can just realize that efficient self discharge is tested.
In actual test process, various test parameters are a length of 4-16 hours when such as first, a length of 1-5 when second
Hour, a length of 5-15 days when the 3rd, blanking voltage is 2.0-3.0V, and design temperature is 15-60 DEG C, design temperature is preferably 25 ±
2 DEG C, it is 25 DEG C to commonly use.
Specific sorting schemes and sorting standard are concentrated in below description.
1st, by 100 ferric phosphate lithium cell partial volumes are complete stablize 4 hours after test V0.Battery is charged to using 0.02C
0.5%SOC tests V1 after standing 1h.Voltage V2 is measured after 25 DEG C of aging 5d.After calculating △ values, contrasted with standard value 40%,
Filter out the higher battery of self discharge.
2nd, by 100 ferric phosphate lithium cell partial volumes are complete stablize 10 hours after test V0.Battery is charged to using 0.06C
2.5%SOC tests V1 after standing 3h.Voltage V2 is measured after 25 DEG C of aging 10d.After calculating △ values, contrasted with standard value 25%,
Filter out the higher battery of self discharge.
3rd, by 100 ferric phosphate lithium cell partial volumes are complete stablize 16 hours after test V0.Battery is charged to 5% using 0.1C
SOC tests V1 after standing 5h.Voltage V2 is measured after 25 DEG C of aging 15d.After calculating △ values, contrasted with standard value 20%, screened
Go out the higher battery of self discharge.
It is the accuracy of the self-discharge performance for further verifying the battery after sorting, from each sorting side in this programme
Two abnormal batteries and two normal batteries are randomly selected in case.Storage in 60 DEG C of baking boxs, checking are put into after charging to 50%SOC
The self discharge problem of battery, obtains experimental result as shown in table 1.
The self-discharge of battery performance test data record sheet of table 1
As can be seen from the above table, the higher battery of select self discharge is pressed in 60 DEG C of ageing processes in each embodiment
Drop be substantially greater than normal battery pressure drop (such as 3#, 4# in test group 1,3#, 4# in test group 2,3# in test group 3,
4#), illustrate quickly and accurately filter out the higher battery of self discharge in the present invention.
The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when making a little change or modification using the technology contents of the disclosure above
It is the Equivalent embodiments of equivalent variations, as long as being without departing from technical solution of the present invention content, according to technical spirit pair of the invention
Any simple modification, equivalent variations and modification that above example is made, still fall within the range of technical solution of the present invention.
Claims (10)
1. a kind of method for separating of self-discharge of battery performance, it is characterised in that including：
To start to stand after battery discharge after partial volume to blanking voltage, measurement stands the burning voltage V0 after the first duration；
Start to stand after the battery is charged into setting state, measurement stands the medium voltage V1 after the second duration；
The battery is continued standing under design temperature environment, measurement stands the final voltage V2 after the 3rd duration；
Self-discharge rate △=(V1-V2)/(V1-V0) of the battery is calculated, according to self-discharge rate △ and standard value judge
The grade of battery.
2. method for separating according to claim 1, it is characterised in that it is described the battery is charged into setting state after open
Begin to stand, specially：
Start to stand after battery is charged into less than 5% remaining capacity SOC using 0.02C-0.1C.
3. method for separating according to claim 1, it is characterised in that described that institute is judged according to self-discharge rate △ and standard value
The grade of battery is stated, specially：
According to the first duration, setting state, the second duration, design temperature environment, the 3rd duration validation criteria value；
The self-discharge rate △ correspondence standard values are confirmed the grade of the battery.
4. method for separating according to claim 1, it is characterised in that a length of 4-16 hours when described first.
5. method for separating according to claim 1, it is characterised in that a length of 1-5 hours when described second.
6. method for separating according to claim 1, it is characterised in that a length of 5-15 days when the described 3rd.
7. method for separating according to claim 1, it is characterised in that the blanking voltage is 2.0-3.0V.
8. method for separating according to claim 1, it is characterised in that the design temperature is 15-60 DEG C.
9. method for separating according to claim 8, it is characterised in that the design temperature is 25 DEG C.
10. method for separating according to claim 1, it is characterised in that the battery is ferric phosphate lithium cell.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108061860A (en) * | 2017-11-24 | 2018-05-22 | 上海华普汽车有限公司 | A kind of self-discharge of battery detection method and lithium battery method for sorting |
| CN108160531A (en) * | 2018-03-15 | 2018-06-15 | 惠州亿纬锂能股份有限公司 | A kind of self-discharge of battery method for separating |
| CN108607820A (en) * | 2018-04-20 | 2018-10-02 | 桑顿新能源科技有限公司 | A kind of low electric consumable electric sieve choosing method of LiFePO4 battery core |
| CN109201521A (en) * | 2017-07-09 | 2019-01-15 | 深圳格林德能源有限公司 | A kind of nickle cobalt lithium manganate lithium ion battery self discharge screening technology |
| CN111060825A (en) * | 2019-12-09 | 2020-04-24 | 广州鹏辉能源科技股份有限公司 | Detection method of lithium iron phosphate battery |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
| WO2020246972A1 (en) * | 2019-06-05 | 2020-12-10 | Xilectric, Inc. | Systems apparatus and methods of cyclic coulometry |
| CN112698227A (en) * | 2020-11-24 | 2021-04-23 | 合肥国轩高科动力能源有限公司 | Lithium ion battery self-discharge abnormity screening method |
| CN112731003A (en) * | 2020-12-02 | 2021-04-30 | 天津瑞源电气有限公司 | Health state detection method and device for backup super capacitor module of variable pitch system |
| CN113064086A (en) * | 2021-03-31 | 2021-07-02 | 湖北亿纬动力有限公司 | Method, device and system for testing self-discharge rate of lithium ion battery |
| CN113364834A (en) * | 2021-05-24 | 2021-09-07 | 苏州优博达机器人有限公司 | Operation method of street power bank remote lease system |
| CN113364835A (en) * | 2021-05-24 | 2021-09-07 | 苏州优博达机器人有限公司 | Cloud management system and management method for sharing mobile power supply |
| CN113795762A (en) * | 2019-11-05 | 2021-12-14 | 株式会社Lg新能源 | Battery diagnosis device, battery diagnosis method and energy storage system |
| 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 |
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| 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 |
| CN109201521A (en) * | 2017-07-09 | 2019-01-15 | 深圳格林德能源有限公司 | A kind of nickle cobalt lithium manganate lithium ion battery self discharge screening technology |
| CN108061860A (en) * | 2017-11-24 | 2018-05-22 | 上海华普汽车有限公司 | A kind of self-discharge of battery detection method and lithium battery method for sorting |
| 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 |
| CN108160531A (en) * | 2018-03-15 | 2018-06-15 | 惠州亿纬锂能股份有限公司 | A kind of self-discharge of battery method for separating |
| CN108607820A (en) * | 2018-04-20 | 2018-10-02 | 桑顿新能源科技有限公司 | A kind of low electric consumable electric sieve choosing method of LiFePO4 battery core |
| WO2020246972A1 (en) * | 2019-06-05 | 2020-12-10 | Xilectric, Inc. | Systems apparatus and methods of cyclic coulometry |
| CN113795762A (en) * | 2019-11-05 | 2021-12-14 | 株式会社Lg新能源 | Battery diagnosis device, battery diagnosis method and energy storage system |
| CN113795762B (en) * | 2019-11-05 | 2023-09-15 | 株式会社Lg新能源 | Battery diagnosis device, battery diagnosis method and energy storage system |
| CN111060825A (en) * | 2019-12-09 | 2020-04-24 | 广州鹏辉能源科技股份有限公司 | Detection method of lithium iron phosphate battery |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
| CN112698227A (en) * | 2020-11-24 | 2021-04-23 | 合肥国轩高科动力能源有限公司 | Lithium ion battery self-discharge abnormity screening method |
| CN112731003A (en) * | 2020-12-02 | 2021-04-30 | 天津瑞源电气有限公司 | Health state detection method and device for backup super capacitor module of variable pitch system |
| CN113064086B (en) * | 2021-03-31 | 2023-06-30 | 湖北亿纬动力有限公司 | Lithium ion battery self-discharge rate testing method, device and system |
| CN113064086A (en) * | 2021-03-31 | 2021-07-02 | 湖北亿纬动力有限公司 | Method, device and system for testing self-discharge rate of lithium ion battery |
| CN113364835A (en) * | 2021-05-24 | 2021-09-07 | 苏州优博达机器人有限公司 | Cloud management system and management method for sharing mobile power supply |
| CN113364834A (en) * | 2021-05-24 | 2021-09-07 | 苏州优博达机器人有限公司 | Operation method of street power bank remote lease system |
| 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 |
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Application publication date: 20170531 |