CN109254249A - A kind of screening technique of Li-ion batteries piles consistency - Google Patents
A kind of screening technique of Li-ion batteries piles consistency Download PDFInfo
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- CN109254249A CN109254249A CN201810951792.9A CN201810951792A CN109254249A CN 109254249 A CN109254249 A CN 109254249A CN 201810951792 A CN201810951792 A CN 201810951792A CN 109254249 A CN109254249 A CN 109254249A
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Abstract
The invention discloses a kind of screening techniques of Li-ion batteries piles consistency.Steps are as follows: the first step by the present invention, screens to battery capacity consistency；Second step carries out 48h ± 4h room temperature and stands；Third step is grouped series connection test to battery, records each initial voltage of battery data V1 and battery DC internal resistance DCIR1；4th step carries out room temperature aging 14 days under the conditions of 25 DEG C ± 3 DEG C；5th step records voltage data V2 after cell degradation, screens to battery self discharge rate consistency；6th step calculates battery DC internal resistance DCIR2, screens to consistency of internal resistance of battery；7th step draws the V-T curve of cell pulse discharge, and dynamic electric pressure difference is that a section carries out stepping with 30mV, and battery stepping after test is stored.The screening technique of consistency of battery pack of the invention is started with from the static conformance and dynamic conformance of battery, and operating method is simple, and test result reliability is high, meets battery pack actual conditions.
Description
Technical field
The present invention relates to technical field of lithium ion more particularly to a kind of screening sides of Li-ion batteries piles consistency
Method.
Background technique
Lithium ion battery has energy density high, has extended cycle life, self-discharge rate is low, advantages of environment protection, portable
Formula electronic equipment such as mobile phone, bluetooth headset, laptop are widely used；In recent years, pushing away with new-energy automobile
Row, in power battery, the application in the fields such as energy-storage battery is also constantly promoted.In order to meet equipment power demand, it usually needs
Single battery is subjected to series connection and parallel connection, to reach certain voltage and capacitance grade.
When single battery forms mould group by series and parallel, not only the capacity of battery pack is total lower than cell capacity
With charged window also reduces compared with single battery in charge and discharge process, and cycle life is also significantly lower than single battery.This be because
When for series battery charge, if a certain piece of battery reaches charge cutoff voltage in advance, system will stop charging, and prevent it
There is overcharge；When electric discharge, if a certain piece of battery reaches discharge cut-off voltage in advance, will lead to other batteries terminates to put ahead of time
Electricity.Therefore the adduction of the performance not instead of single battery performance of battery modules, is determined by the worst battery of performance in mould group.
For the appearance for preventing short -board effect, screening the good battery composition mould group of consistency becomes urgent problem to be solved.
Summary of the invention
It is an object of the present invention to overcome the above deficiencies, that is, provides a kind of screening side of Li-ion batteries piles consistency
Method comprehensively considers the static state and dynamic conformance of battery, and execution method is simple, improves the service efficiency and safety of battery modules
Property.
The screening technique of Li-ion batteries piles consistency of the invention, comprising the following steps:
The first step, battery is with 0.2C-1C constant-current constant-voltage charging, and cut-off current 0.02C-0.05C, then constant-current discharge is extremely cut
Only voltage after carrying out charge and discharge twice, carries out constant-current constant-voltage charging to 3.65V, to guarantee each cell voltage to battery again
Consistency；Second of discharge capacity is recorded simultaneously, carries out Capacity uniformity screening.Method is to filter out capacity and rated capacity
Ratio is in the battery of 1-1.03, as meets the battery of Capacity uniformity；
Second step, the room temperature for carrying out 48h ± 4h to the battery for meeting Capacity uniformity are stood, and battery status is promoted to stablize；
Third step, the packet chain translocation that the battery after standing to room temperature carries out 8 one group try, and it is initially electric to record each battery
Press data V1, then to series-connected cell group carry out It current pulse discharge ts, record the end ts voltage Vt1, by (Vt1-V1)/
It calculates each battery DC internal resistance DCIR1；
The battery being completed is put between 25 DEG C of ± 3 DEG C of agings and carries out room temperature aging 14 days, by battery difference by the 4th step
Property amplification, so as to subsequent screening；
5th step takes out the battery after room temperature aging, carries out 8 one group of packet chain translocation examination again, and record is each
Voltage data V2 after cell degradation, calculates the voltage difference before and after aging, and the battery of voltage difference > 3mV is removed, remaining
As meet the battery of self-discharge rate consistency；
6th step carries out It current pulse discharge ts to series-connected cell group again, records the voltage Vt2 at the end ts, passes through
(Vt2-V2)/It calculates each battery DC internal resistance DCIR2, and the DC internal resistance calculated before and after aging is poor, and DC internal resistance is poor
The battery of > 0.06m Ω removes, and remaining is the battery for meeting internal resistance consistency；
7th step draws the V-T curve of series-connected cell group ts pulsed discharge, chooses one in non-abnormal curve as by the gross
The V-T curve standard of battery；It is then that a section carries out stepping A, B, C ... according to dynamic electric pressure difference 30mV, it will be electric after test
The storage of pond stepping；
8th step, by meet capacity, self-discharge rate, internal resistance consistency same shelves battery or beaten with composition mould group
It is bundled into a collection of sale, to guarantee static state and dynamic conformance with batch battery.
The lithium ion battery is nickel cobalt manganese, nickel cobalt aluminium ternary battery, ferric phosphate lithium cell or lithium titanate battery.
Dynamic electric pressure difference is the voltage difference in process of pulse discharge between two batteries of each moment.
Series-connected cell group is with It current pulse discharge ts, It reference value 2-10C, t reference value 5-30s.
Compared with prior art, advantages of the present invention effect is:
For the characteristic of battery modules, in conjunction with the static change (capacity, self-discharge rate, internal resistance) and dynamic change of battery
(pulsed discharge V-T curve) provides a kind of screening technique easily and effectively, it is simple to execute method.In addition, according to dynamic after screening
Die-filling group or shipment are organized in the storage of voltage difference stepping, are further ensured that same mould group, the consistency of Vehicular battery, are improved battery
The safety and reliability of mould group and vehicle.
Detailed description of the invention
The V-T curve that Fig. 1 is 2C pulsed discharge 10s after 8 single battery series connection in embodiment.
Specific embodiment
In order to more clearly illustrate the invention patent, here is embodiments of the present invention, but is not limited only to following
Specific example.
Embodiment
It is used in the present embodiment for screening 75Ah LP2222197 lithium ion battery, the specific steps are as follows:
The first step, battery is with 0.33C constant-current constant-voltage charging, cut-off current 0.05C, then extremely with 0.33C constant-current discharge
2.5V after carrying out charge and discharge twice, is shown with above-mentioned system and carries out constant-current constant-voltage charging to 3.65V, to guarantee each battery to battery
The consistency of voltage；Second of discharge capacity is recorded simultaneously, filters out capacity and rated capacity ratio is in the battery of 1-1.03；
Second step, the room temperature for carrying out 48h ± 4h are stood, and battery status is promoted to stablize；
Third step, the packet chain translocation that the battery after standing to room temperature carries out 8 one group try, and it is initially electric to record each battery
Data V1 is pressed, then series-connected cell group is carried out to carry out 2C current pulse discharge 10s, the voltage Vt1 at the end 10s is recorded, passes through
(Vt1-V1)/It calculates each battery DC internal resistance DCIR1；
The battery being completed is put between 25 DEG C of ± 3 DEG C of agings the aging of progressive room temperature 14 days by the 4th step；
5th step, the battery after aging are grouped series connection test, the voltage data after recording each cell degradation again
V2 calculates the voltage difference before and after aging, and the battery of voltage difference > 3mV is removed,；
6th step carries out 2C current pulse discharge 10s to series-connected cell group again, records the voltage Vt2 at the end 10s, passes through
(Vt2-V2)/It calculates each battery DC internal resistance DCIR2, and the DC internal resistance calculated before and after aging is poor, and DC internal resistance is poor
The battery of > 0.06m Ω removes；
7th step draws the V-T curve (as shown in Figure 1) of series-connected cell group 10s electric discharge, chooses one in non-abnormal curve
Item is the V-T curve standard of battery by the gross；It is then that a section carries out stepping A, B, C ... according to dynamic electric pressure difference 30mV, it will
Battery stepping is stored after test.
Claims (4)
1. a kind of screening technique of Li-ion batteries piles consistency, which is characterized in that carry out as steps described below:
The first step, battery is with 0.2C-1C constant-current constant-voltage charging, cut-off current 0.02C-0.05C, and then constant-current discharge is to ending electricity
Pressure after carrying out charge and discharge twice, carries out constant-current constant-voltage charging to 3.65V, to guarantee the one of each cell voltage to battery again
Cause property；Second of discharge capacity is recorded simultaneously, is carried out Capacity uniformity screening, is to filter out capacity to be in rated capacity ratio
The battery of 1-1.03 as meets the battery of Capacity uniformity；
Second step, the room temperature for carrying out 48h ± 4h to the battery for meeting Capacity uniformity are stood, and battery status is promoted to stablize；
Third step, the packet chain translocation that the battery after standing to room temperature carries out 8 one group try, and record each initial voltage of battery number
According to V1, It current pulse discharge ts then is carried out to series-connected cell group, records the voltage Vt1 at the end ts, by (Vt1-V1)/It,
Calculate each battery DC internal resistance DCIR1；
The battery being completed is put between 25 DEG C of ± 3 DEG C of agings and carries out room temperature aging 14 days, battery otherness is put by the 4th step
Greatly, so as to subsequent screening；
5th step takes out the battery after room temperature aging, carries out 8 one group of packet chain translocation examination again, records each battery
Voltage data V2 after aging, calculates the voltage difference before and after aging, and the battery of voltage difference > 3mV is removed, remaining to be
Meet the battery of self-discharge rate consistency；
6th step carries out It current pulse discharge ts to series-connected cell group again, records the voltage Vt2 at the end ts, passes through (Vt2-
V2)/It calculates each battery DC internal resistance DCIR2, and the DC internal resistance calculated before and after aging is poor, by DC internal resistance difference >
The battery of 0.06m Ω removes, and remaining is the battery for meeting internal resistance consistency；
7th step draws the V-T curve of series-connected cell group ts pulsed discharge, chooses one in non-abnormal curve as battery by the gross
V-T curve standard；It is then that a section carries out stepping according to dynamic electric pressure difference 30mV, battery stepping after test is stored；
8th step, by meet capacity, self-discharge rate, internal resistance consistency same shelves battery or be packaged into composition mould group
A batch is sold, to guarantee static state and dynamic conformance with batch battery.
2. a kind of screening technique of Li-ion batteries piles consistency according to claim 1, it is characterized in that: the lithium-ion electric
Pond is nickel cobalt manganese, nickel cobalt aluminium ternary battery, ferric phosphate lithium cell or lithium titanate battery.
3. a kind of screening technique of Li-ion batteries piles consistency according to the 7th step of right 1, it is characterized in that: the dynamic electric
Pressure difference is the voltage difference in process of pulse discharge between two batteries of each moment.
4. a kind of screening technique of Li-ion batteries piles consistency according to right 1, it is characterized in that: the series-connected cell group with
It current pulse discharge ts, wherein It reference value 2-10C, t reference value 5-30s.
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| CN109860739A (en) * | 2019-02-19 | 2019-06-07 | 湖北鹏程新锐科技发展有限公司 | A kind of non-equal compound formulation, system, storage medium and device for holding battery pack |
| CN110221226A (en) * | 2019-04-30 | 2019-09-10 | 蜂巢能源科技有限公司 | The test method and test macro of battery pack Capacity uniformity |
| CN110542864A (en) * | 2019-08-23 | 2019-12-06 | 江西优特汽车技术有限公司 | Thermodynamic detection method for self-discharge rate of lithium ion battery |
| CN110542863A (en) * | 2019-08-23 | 2019-12-06 | 江西优特汽车技术有限公司 | Power battery self-discharge rate detection method |
| CN110646742A (en) * | 2019-10-15 | 2020-01-03 | 桑顿新能源科技(长沙)有限公司 | Power battery SOH acquisition method, system and related assembly |
| CN110681616A (en) * | 2019-11-13 | 2020-01-14 | 洛阳超特电源科技有限公司 | Method for testing direct current internal resistance of lithium ion battery and method for sorting lithium ion battery |
| CN111001588A (en) * | 2019-11-01 | 2020-04-14 | 安徽绿沃循环能源科技有限公司 | Battery pack echelon recycling method |
| CN111029668A (en) * | 2019-11-25 | 2020-04-17 | 江西恒动新能源有限公司 | Matching method of lithium ion power batteries |
| CN111239631A (en) * | 2020-03-09 | 2020-06-05 | 天津市捷威动力工业有限公司 | Lithium ion battery self-discharge identification screening method, storage medium and equipment |
| CN111722128A (en) * | 2020-05-19 | 2020-09-29 | 风帆有限责任公司 | Low-voltage matching method for lithium batteries |
| CN111786035A (en) * | 2019-04-03 | 2020-10-16 | 深圳格林德能源集团有限公司 | Lithium ion battery matching method |
| CN112186278A (en) * | 2020-09-23 | 2021-01-05 | 珠海冠宇动力电池有限公司 | Lithium ion battery matching method |
| CN112327180A (en) * | 2019-11-27 | 2021-02-05 | 万向一二三股份公司 | Lithium ion battery self-discharge evaluation and voltage balance adjustment method thereof |
| CN112415416A (en) * | 2020-11-12 | 2021-02-26 | 河北零点新能源科技有限公司 | Method for rapidly detecting consistency of lithium batteries |
| CN112649742A (en) * | 2020-11-04 | 2021-04-13 | 天津恒天新能源汽车研究院有限公司 | Screening method of lithium ion battery |
| CN113064094A (en) * | 2021-03-22 | 2021-07-02 | 中国人民解放军国防科技大学 | Method and system for screening single batteries of cell type spacecraft lithium battery |
| CN113125973A (en) * | 2021-04-20 | 2021-07-16 | 太仓中科赛诺新能源科技有限公司 | Detection method for rapidly judging battery performance consistency in water system sodium ion battery pack |
| CN113285513A (en) * | 2021-06-11 | 2021-08-20 | 湖北亿纬动力有限公司 | Method, device, equipment and storage medium for evaluating self-discharge consistency of battery |
| CN113325318A (en) * | 2021-04-30 | 2021-08-31 | 上海空间电源研究所 | Lithium ion storage battery consistency screening method |
| CN113406504A (en) * | 2021-06-17 | 2021-09-17 | 上海空间电源研究所 | Consistency screening method for high-power lithium ion storage battery |
| CN113871727A (en) * | 2021-12-02 | 2021-12-31 | 深圳市铂纳特斯自动化科技有限公司 | Self-adaptive formation method and system for improving consistency of lithium ions |
| CN113894059A (en) * | 2021-09-28 | 2022-01-07 | 格林美股份有限公司 | Sorting method for gradient utilization of lithium iron phosphate batteries |
| CN114951042A (en) * | 2022-05-12 | 2022-08-30 | 华富(江苏)锂电新技术有限公司 | Screening method for improving uniformity of echelon batteries |
| CN116577687A (en) * | 2023-07-14 | 2023-08-11 | 南昌航空大学 | Cell screening method and system for quick-charging battery pack, storage medium and computer |
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| CN113406504A (en) * | 2021-06-17 | 2021-09-17 | 上海空间电源研究所 | Consistency screening method for high-power lithium ion storage battery |
| CN113894059A (en) * | 2021-09-28 | 2022-01-07 | 格林美股份有限公司 | Sorting method for gradient utilization of lithium iron phosphate batteries |
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