CN104741327A - Dynamic consistent sorting method for lithium-ion power battery - Google Patents
Dynamic consistent sorting method for lithium-ion power battery Download PDFInfo
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Abstract
The invention discloses a dynamic consistent sorting method for a lithium-ion power battery. The method comprises the following steps: (1) preliminarily sorting, namely selecting single batteries with approximate capacity; (2) performing normal-temperature full-charge full-discharge cycle on battery cells of the single batteries subjected to preliminary sorting for 3-5 times; (3) recording the constant current charge time and discharge platform voltage time of each battery cell, and screening the batteries of which the constant current ratio is 90 percent and more and the discharge platform voltage time is 45 minutes and more; (4) screening the batteries with self-discharge qualified cells; (5) screening the batteries of which the internal resistance is within 1-3mOhm and the electrically neutral open-circuit voltage is within 200mV; and (6) screening the batteries of the same type by taking the instantaneous voltage difference in the high-rate charge/discharge process of the batteries as the standard. The single batteries sorted by adopting the dynamic sorting method in which the voltage value is taken as the standard can be close to the actual working conditions, the single batteries with close influence are sorted, and the performances of the obtained grouped batteries are obviously better than that of a battery pack obtained by static sorting.
Description
Technical field
The present invention relates to a kind of lithium-ion-power cell dynamic conformance method for separating, belong to battery sorting field.
Background technology
In recent years along with the fast development of electric automobile, increasing to the demand of battery, number of batteries required for an electric automobile is thousands of, the battery consistency of the battery request composition of the battery composition of such big figure is high especially, the course continuation mileage that present people know electric motor car is short, the problem that battery life is short, reason is that certain battery of internal battery pack and other battery performances are inconsistent, in the process of battery charging and discharging, this battery (or single battery place battery strings) there will be the phenomenon of filling height and loweing, cause whole battery pack to reach sample circuit when charging deboost in advance and can think that this battery pack has charged end stopping for battery pack charging, cause the charge less of whole battery pack like this, cause battery capacity not enough, in use the performance of battery pack has to decline significantly and just there will be course continuation mileage shortening, even cause safety problem.
Current battery sorting method has platform voltage separating method, static capacity separating method, internal resistance separating method, and in actual applications, we find, through the battery that these static methods sort out, after being assembled into stack battery, under identical condition of work, the performance of battery itself can change a lot, the capacity of battery, internal resistance and charging and discharging curve there will be change, result causes the performance degradation of battery pack entirety, affect the performance of battery pack, the present invention proposes a kind of dynamic method of testing for these situations and carry out sorting cell.
Summary of the invention
The object of the present invention is to provide a kind of lithium-ion-power cell dynamic conformance method for separating, mainly solve after battery pack that existing battery sorting method sub-elects dresses up stack battery, the problem that overall performance is low.The uniformity of cell is battery key in groups, directly affects life-span and the performance of stack battery, the present invention proposes battery core after static sorting, and with the dynamic method for separating of one, battery that is simple to operate, that sort out runs rear performance in groups close to consistent.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of lithium-ion-power cell dynamic conformance method for separating, comprises the steps: first battery to be carried out static sorting, then carries out dynamic sorting;
Described static sorting step:
(1) preliminary sorting: the cell that capacity of picking out is close, capacity difference≤50mAh;
(2) battery core of the cell after preliminary sorting is all carried out 3 ~ 5 normal temperature entirely to fill and entirely put circulation;
(3) record constant-current charge time and the discharge platform voltage time of each battery core, filter out constant current than more than 90%, discharge platform voltage time is at the battery of more than 45min;
(4) the not charged battery battery core high temperature 45 DEG C screened is left standstill 10 days, after then normal temperature leaves standstill 4 ~ 6h, filter out the battery with the qualified battery core of self discharge, described qualified standard is for leaving standstill front and back voltage difference △ V≤50mV;
(5) internal resistance is screened in 1 ~ 3m Ω, and the battery of not charged open-circuit voltage within 200mV;
Described dynamic sorting step:
(6) with the instantaneous voltage difference in battery high rate charge-discharge process for standard screening battery of the same type.
Particularly, the concrete screening technique of described step (6) is: each battery battery core that will filter out after step (5) charges with 4 ~ 6C under 80%SOC condition, and discharge with 8 ~ 10C under 10% ~ 20%SOC state, gather charging and discharging 10s Instantaneous Situation voltage, the dynamic voltage difference of screening charging is within 7mV, and electric discharge dynamic electric voltage difference is the battery within 10mV.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention records corresponding dynamic electric voltage instantaneous value for adopting dynamic heavy current pulse and arteries and veins to put postscript, this instantaneous voltage combines the situation of change of polarization resistance, ohmic internal resistance, large current density condition and voltage, the magnitude of voltage obtained with this dynamic sorting method for standard scores selects cell can closer to actual condition, sorting affects close cell, the battery pack that the stack battery performance obtained obtains significantly better than static sorting.
Accompanying drawing explanation
Fig. 1 is workflow diagram of the present invention.
Fig. 2 is experimental data contrast effect figure of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
As shown in Figure 1, a kind of lithium-ion-power cell dynamic conformance method for separating, comprises the steps:
(1) preliminary sorting: the cell that capacity of picking out is close, capacity difference≤50mAh;
(2) battery core of the cell after preliminary sorting is all carried out 3 ~ 5 normal temperature entirely to fill and entirely put circulation, ensure the accuracy of experiment;
(3) record constant-current charge time and the discharge platform voltage time of each battery core, filter out constant current than more than 90%, discharge platform voltage time is at the battery of more than 45min;
(4) the not charged battery battery core high temperature 45 DEG C of sorting is left standstill 10 days, after then normal temperature leaves standstill 4 ~ 6h, filters out the battery with the qualified battery core of self discharge, described qualified standard is for leaving standstill front and back voltage difference △ V≤50mV;
(5) internal resistance is screened in 1 ~ 3m Ω, and the battery of not charged open-circuit voltage within 200mV;
(6) with the instantaneous voltage difference in battery high rate charge-discharge process for standard screening battery of the same type, be specially: each battery battery core filtered out is charged with 4 ~ 6C under 80%SOC condition, and discharge with 8 ~ 10C under 10% ~ 20%SOC state, gather charging and discharging 10s Instantaneous Situation voltage, the dynamic voltage difference of screening charging is within 7mV, and electric discharge dynamic electric voltage difference is the battery within 10mV.
The present invention records corresponding dynamic electric voltage instantaneous value for adopting dynamic heavy current pulse and arteries and veins to put postscript, this instantaneous voltage combines the situation of change of polarization resistance, ohmic internal resistance, large current density condition and voltage, the magnitude of voltage obtained with this dynamic sorting method for standard scores selects cell can closer to actual condition, sorting affects close cell, the battery pack that the stack battery performance obtained obtains significantly better than static sorting.
If Fig. 2 (a) is that the battery pack adopting 10 cells obtaining of existing static method for separating to be connected into runs the discharge curve after 50 times, Fig. 2 (b) adopts dynamic sorting method of the present invention to be connected into the discharge curve after operation after battery pack 50 times by 10 cells that 80%SOC pulse and 10%SOC arteries and veins put sorting.
From Fig. 2 (a) and 2(b) Experimental comparison, the battery pack of the cell adopting static method for separating to obtain composition, there is decay in battery capacity, the obvious increasing and capacity is taken a walk.And the battery pack of the cell composition adopting dynamic sorting method of the present invention to obtain, battery capacity all keeps good uniformity.
Experiment shows, adopt dynamic sorting method, taken into full account the impact on cell of polarization resistance, ohmic internal resistance and high current charge-discharge in process, sorting affects close cell, the battery pack that the stack battery performance obtained obtains significantly better than static sorting.
According to above-described embodiment, just the present invention can be realized well.What deserves to be explained is; under prerequisite based on said structure design, for solving same technical problem, even if make some on the invention without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it also should in protection scope of the present invention.
Claims (4)
1. a lithium-ion-power cell dynamic conformance method for separating, is characterized in that, comprises the steps: first battery to be carried out static sorting, then carries out dynamic sorting;
Described static sorting step:
(1) preliminary sorting: the cell that capacity of picking out is close;
(2) battery core of the cell after preliminary sorting is all carried out 3 ~ 5 normal temperature entirely to fill and entirely put circulation;
(3) record constant-current charge time and the discharge platform voltage time of each battery core, filter out constant current than more than 90%, discharge platform voltage time is at the battery of more than 45min;
(4) the not charged battery battery core quiescence in high temperature will screened, filters out the battery with the qualified battery core of self discharge;
(5) internal resistance is screened in 1 ~ 3m Ω, and the battery of not charged open-circuit voltage within 200mV;
Described dynamic sorting step:
(6) with the instantaneous voltage difference in battery high rate charge-discharge process for standard screening battery of the same type.
2. a kind of lithium-ion-power cell dynamic conformance method for separating according to claim 1, is characterized in that, in described step (1), and the capacity difference≤50mAh of cell.
3. a kind of lithium-ion-power cell dynamic conformance method for separating according to claim 2, it is characterized in that, in described step (4), the condition left standstill is: 45 DEG C leave standstill 10 days, then, after normal temperature leaves standstill 4 ~ 6h, described qualified standard is for leaving standstill front and back voltage difference △ V≤50mV.
4. a kind of lithium-ion-power cell dynamic conformance method for separating according to claim 3, it is characterized in that, the concrete screening technique of described step (6) is: each battery battery core that will filter out after step (5) charges with 4 ~ 6C under 80%SOC condition, and discharge with 8 ~ 10C under 10% ~ 20%SOC state, gather charging and discharging 10s Instantaneous Situation voltage, the dynamic voltage difference of screening charging is within 7mV, and electric discharge dynamic electric voltage difference is the battery within 10mV.
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| CN105304954A (en) * | 2015-09-30 | 2016-02-03 | 东莞市致格电池科技有限公司 | Battery grouping method and battery grouping system |
| CN105489952A (en) * | 2016-01-08 | 2016-04-13 | 深圳市沃特玛电池有限公司 | Matching method for improving self-discharge consistency of lithium iron phosphate power battery pack |
| CN105583170A (en) * | 2016-01-28 | 2016-05-18 | 珠海光宇电池有限公司 | Method for screening lithium ion batteries |
| CN106450520A (en) * | 2016-10-28 | 2017-02-22 | 天津市捷威动力工业有限公司 | Power battery cell sorting method and system |
| CN107362989A (en) * | 2017-07-27 | 2017-11-21 | 东莞威胜储能技术有限公司 | A kind of method for separating of lithium-ion-power cell |
| CN107992149A (en) * | 2016-10-27 | 2018-05-04 | 中芯国际集成电路制造(上海)有限公司 | The method for repairing and regulating of voltage bandgap circuit and trim device |
| CN108051751A (en) * | 2017-11-25 | 2018-05-18 | 合肥国轩高科动力能源有限公司 | Lithium ion power battery sorting method and system |
| CN108196195A (en) * | 2017-12-27 | 2018-06-22 | 银隆新能源股份有限公司 | Battery assembly method, device and equipment |
| CN108196204A (en) * | 2018-03-08 | 2018-06-22 | 珠海格力电器股份有限公司 | Method and testing device for rapidly detecting self-discharge consistency of lithium ion battery |
| CN108680868A (en) * | 2018-05-28 | 2018-10-19 | 天津市捷威动力工业有限公司 | A kind of battery pack loop test consistency analysis method |
| CN108776307A (en) * | 2018-04-24 | 2018-11-09 | 合肥国轩高科动力能源有限公司 | Lithium ion battery cell consistency screening method based on battery cell heat production quantity |
| CN109324297A (en) * | 2018-10-19 | 2019-02-12 | 张瑞锋 | A kind of method of consistency of battery pack analysis |
| CN109782193A (en) * | 2018-12-13 | 2019-05-21 | 惠州市亿能电子有限公司 | A kind of method of discrimination of multiple branch circuit battery circuit open circuit |
| CN110201913A (en) * | 2019-05-29 | 2019-09-06 | 河南电池研究院有限公司 | A kind of screening technique of soft bag lithium ionic cell consistency |
| CN110221227A (en) * | 2019-05-31 | 2019-09-10 | 上海动力储能电池系统工程技术有限公司 | Single battery state consistency evaluating method in battery modules |
| CN110813799A (en) * | 2018-08-13 | 2020-02-21 | 中信国安盟固利动力科技有限公司 | Consistency screening method of lithium titanate single battery for high rate |
| CN111036575A (en) * | 2019-12-05 | 2020-04-21 | 国电南瑞科技股份有限公司 | Lithium ion battery sorting method based on temperature change analysis |
| CN111063951A (en) * | 2019-11-19 | 2020-04-24 | 安徽益佳通电池有限公司 | Method for screening and matching self-discharge of lithium ion battery |
| CN111679218A (en) * | 2015-12-03 | 2020-09-18 | 深圳市大疆创新科技有限公司 | System and method for determining an operating state of a battery |
| CN111722128A (en) * | 2020-05-19 | 2020-09-29 | 风帆有限责任公司 | Low-voltage matching method for lithium batteries |
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| CN113399309A (en) * | 2021-05-27 | 2021-09-17 | 安徽天时新能源科技有限公司 | Screening method for monitoring consistency of capacity of discharge end of battery cell |
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| CN108051751A (en) * | 2017-11-25 | 2018-05-18 | 合肥国轩高科动力能源有限公司 | Lithium ion power battery sorting method and system |
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| CN108680868B (en) * | 2018-05-28 | 2020-09-11 | 天津市捷威动力工业有限公司 | Battery pack cycle test consistency analysis method |
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