CN107597621A - A kind of screening technique and method for group matching for lifting ternary Li-ion batteries piles uniformity - Google Patents
A kind of screening technique and method for group matching for lifting ternary Li-ion batteries piles uniformity Download PDFInfo
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- CN107597621A CN107597621A CN201710984521.9A CN201710984521A CN107597621A CN 107597621 A CN107597621 A CN 107597621A CN 201710984521 A CN201710984521 A CN 201710984521A CN 107597621 A CN107597621 A CN 107597621A
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Abstract
The invention discloses a kind of screening technique for lifting ternary Li-ion batteries piles uniformity, comprise the following steps：The constant current of S1, each cell of measure in third time discharge and recharge is filled with the DC internal resistance R of ratio, discharge capacity C1 and the 10s that discharges；Internal resistance of cell r, open-circuit voltage U2, the self-discharge rate K for the cell that S2, each rated capacity of measure are C；Filter out that C1 is 1.03C to 1.07C, constant current is filled with than being designated as primary screening battery for 94 98% cell in S3, the cell for being C from multiple rated capacities；R, U2 of primary screening battery screening scope are calculated, limits K screening scope, and filter out battery of r, U2, K value in the range of screening.The invention also discloses a kind of method for group matching for lifting ternary Li-ion batteries piles uniformity.The uniformity of the battery performance obtained using present invention screening, combo is good.
Description
Technical field
The present invention relates to lithium ion battery sorting technology field, more particularly to a kind of lifting ternary Li-ion batteries piles are consistent
The screening technique and method for group matching of property.
Background technology
As electric automobile is for the demand more and more higher of course continuation mileage, the ternary lithium ion power with high-energy-density
Battery is increasingly becoming the trend of market development.To meet certain energy and power demand, Vehicular dynamic battery system often by
Tens of or hundreds of even thousands of cells carry out connection in series-parallel composition, and the groups of uniformity height of monomer directly decides most
Whole battery bag performance, life-span and security.
The uniformity of battery cell is mainly determined by raw material, manufacturing process and for the use of process three.And raw material and
The factor and link that manufacturing process is related to are too many, in general, after lithium battery manufacturing enterprise is typically made up of cell
Sorting ensure uniformity of the battery in grouping procedure.At present, the screening for lithium ion battery is more using capacity, electricity
The indexs such as pressure, internal resistance and self discharge, it is contemplated that the efficiency and operability of production, lithium battery enterprise is typically during groups of
It is that screening conditions carry out combo to ensure the uniformity of battery pack with some Static State Index (such as capacity, voltage).
But the charging and discharging curve of ternary battery and LiFePO4 otherness are larger, existing screening technique carries out the ternary of combo
The uniformity such as battery pack its capacity, pressure difference are poor, cause the utilization rate of battery core very low, it is therefore desirable to which prescription is matched somebody with somebody in new screening
Method lifts the uniformity of ternary battery performance.
The content of the invention
Based on technical problem existing for background technology, the present invention proposes a kind of lifting ternary Li-ion batteries piles uniformity
Screening technique and method for group matching, the present invention is simple to operate, using present invention screening, the obtained battery performance of combo it is consistent
Property is good.
A kind of screening technique for lifting ternary Li-ion batteries piles uniformity proposed by the present invention, comprises the following steps：
S1, under room temperature state, by multiple rated capacities be C cell carry out 3 0.1C-1.5C charge-discharge magnifications
Circulation, is finally arranged to 20-65% by the carrying capacity SOC of battery, and the 10s that discharges, and determines each cell and is placed on and fills for the third time
Constant current during electric discharge is filled with the DC internal resistance R of ratio, discharge capacity C1 and the 10s that discharges；
Internal resistance of cell r, open-circuit voltage U2, the self-discharge rate K for the cell that S2, each rated capacity of measure are C；
Filtered out in S3, the cell for being C from multiple rated capacities C1 be 1.03C to 1.07C, constant current be filled with than for
94-98% cell is designated as primary screening battery；Calculate r, U2, K of primary screening battery average valueAnd limit r, U2 relative deviation scope dr、dU2, then r, U2 screening scope are calculated, limit K screening
Scope, battery of r, U2, K value in the range of screening is filtered out from primary screening battery, wherein, r screening scope isU2 screening scope is
Preferably, in S1,3 0.5C charge-discharge magnifications circulations are carried out.
Preferably, in S1, carrying capacity SOC is 50%.
Preferably, in S3, drFor 2%-10%, dU2For 0-0.5%, K screening scope is 0 ＜ K<1mV/ days.
Preferably, in S2, r, U2, K assay method are：By rated capacity be C cell in room temperature environment
Place t1 days, determine open-circuit voltage U1, the internal resistance of cell r of battery；The cell that rated capacity is C is put in room temperature environment
Put t2 days, determine the open-circuit voltage U2 of battery, calculate self-discharge rate K, K=(U2-U1)/(t2-t1).
Preferably, 1≤t1≤3.
Preferably, 2≤t2≤14.
The invention also provides a kind of method for group matching for lifting ternary Li-ion batteries piles uniformity, comprise the following steps：
Take the multiple cells filtered out according to above-mentioned screening technique, according to the DC internal resistance R of cell, according to R values from it is small to
Cell is divided into n section by big order, is denoted as 1 grade, 2 grades ... n shelves respectively；2 grades of cells to n-1 shelves are carried out
Identical gear battery combo, 1 grade is carried out mixing combo with 2 grades of cell, and n shelves are mixed with the cell of n-1 shelves
Combo.
Preferably, 2≤n≤8.
Routinely statistical method calculates for average value and relative deviation.
Constant current is filled with than for constant-current charge capacity in charging process and constant-current charge capacity and constant-voltage charge capacity sum
Ratio, it is noun commonly used in the art.
The present invention is easy to operate, it is not necessary to increases extra screening installation and cost, and is filled by discharge capacity C1, constant current
Enter five ratio, internal resistance of cell r, open-circuit voltage U2, self-discharge rate K comprehensive screenings of parametric synthesis, can accurately ensure to screen
The uniformity of the cell performance gone out, while can be in lifting electricity using battery pack made from DC internal resistance R progress stepping combos
The uniformity of the performances such as battery capacity, pressure difference is significantly improved in the case of core utilization rate.
Brief description of the drawings
Fig. 1 is embodiment 1 and each set battery power discharge capacity comparison figure in comparative example 1.
Fig. 2 is embodiment 1 and each set battery power discharge end pressure difference comparison diagram in comparative example 1.
Embodiment
Below, technical scheme is described in detail by specific embodiment.
Embodiment 1
A kind of screening technique for lifting ternary Li-ion batteries piles uniformity, comprises the following steps：
S1, under room temperature state, multiple rated capacity C=30Ah cell is subjected to 3 0.5C charge-discharge magnifications
Circulation, the carrying capacity SOC of battery is finally arranged to 50%, and with 0.5C electric discharge 10s, determines each cell and filled for the third time
Constant current during electric discharge is filled with the DC internal resistance R of ratio, discharge capacity C1 and the 10s that discharges；
S2, rated capacity C=30Ah cell placed 2 days in room temperature environment, determine the open-circuit voltage of battery
U1, internal resistance of cell r；The cell that rated capacity is C is placed 7 days in room temperature environment, determines the open-circuit voltage U2 of battery,
Calculate self-discharge rate K；
S3, filter out from multiple rated capacity C=30Ah cell C1 and be filled with ratio for 30.9-32.1Ah, constant current
Cell equal to 94-98% is designated as primary screening battery；Calculate r, U2, K of primary screening battery average valueAnd limit r, U2 relative deviation scope dr、dU2, then r, U2 screening scope are calculated, limit K screening
Scope, battery of r, U2, K value in the range of screening is filtered out from primary screening battery,dr=4.4%, dU2=0.2%, r screening scope are 0.86-0.94m Ω, U2 sieve
It is 0 ＜ K to select the screening scope that scope is 3.6577-3.6723V, K<1mV/ days.
A kind of method for group matching for lifting ternary Li-ion batteries piles uniformity, comprises the following steps：Take according to above-mentioned screening
The cell 5000 that method filters out, will be single according to the order of R values from small to large according to the DC internal resistance R of cell
Body battery is divided into 4 sections, is denoted as 1-4 shelves respectively, and stepping scheme is as follows：
1 grade：1.66mΩ≤R<1.69m Ω,
2 grades：1.69mΩ≤R<1.72m Ω,
3 grades：1.72mΩ≤R<1.75m Ω,
4 grades：1.75mΩ≤R≤1.78mΩ；
Every 5 cell parallels form a module, and the combo scheme of module is：11222、22222、33333、33344；
4800 are used altogether according to 5000 cells of this combo scheme, is made into 20 sets of battery bags, and cell utilizes
Rate is 96%.
Comparative example 1
According in the discharge capacity C1 of the multiple rated capacity C=30Ah of method measure of embodiment 1 cell, battery
Hinder r, open-circuit voltage U2, self-discharge rate K；According still further to traditional battery core screening mode, the screening scope for determining C1, r, U2, K is respectively
30.9-33Ah, 0.6-1.2m Ω, 3.650-3.670V, 0 ＜ K<1mV/ days, qualified cell 5000 is filtered out, according to
Traditional stepping method, according to the discharge capacity C1 steppings of cell, it is divided into 4 sections, is denoted as 1-4 shelves, stepping scheme respectively
It is as follows：
1 grade：30.9Ah≤C1<31.4Ah,
2 grades：31.4Ah≤C1<31.9Ah,
3 grades：31.9Ah≤C1<32.4Ah,
4 grades：32.4Ah≤C1≤33Ah；
Every 5 cell parallels form a module, and the combo scheme of module is：11222、22222、33333、33344；
4320 are used altogether according to 5000 cells of this combo scheme, is made into 18 sets of battery bags, and cell utilizes
Rate is 86.4%.
18 sets of battery bags that the 20 sets of battery bags and comparative example 1 obtained to embodiment 1 obtain carry out 0.5C charge-discharge performances
Test, discharge capacity and end pressure difference are recorded, as a result reference picture 1-2, Fig. 1 is that embodiment 1 is put with respectively covering battery pack in comparative example 1
Capacitance comparison diagram；Fig. 2 is embodiment 1 and each set battery power discharge end pressure difference comparison diagram in comparative example 1.Can by Fig. 1 and Fig. 2
To find out that the discharge capacity of each set battery pack obtained through present invention screening, combo, the uniformity for the end pressure difference that discharges are substantially high
The battery pack that method for group matching obtains is selected in conventional screen.
Embodiment 2
A kind of screening technique for lifting ternary Li-ion batteries piles uniformity, comprises the following steps：
S1, under room temperature state, multiple rated capacity C=25Ah cell is subjected to 3 0.5C charge-discharge magnifications
Circulation, the carrying capacity SOC of battery is finally arranged to 50%, and with 0.5C electric discharge 10s, determines each cell and filled for the third time
Constant current during electric discharge is filled with the DC internal resistance R of ratio, discharge capacity C1 and the 10s that discharges；
S2, rated capacity C=30Ah cell placed 2 days in room temperature environment, determine the open-circuit voltage of battery
U1, internal resistance of cell r；The cell that rated capacity is C is placed 7 days in room temperature environment, determines the open-circuit voltage U2 of battery,
Calculate self-discharge rate K；
S3, filter out from multiple rated capacity C=25Ah cell C1 and be filled with for 25.75-26.75Ah, constant current
Primary screening battery is designated as than the cell equal to 94-98%；Calculate r, U2, K of primary screening battery average valueAnd limit r, U2 relative deviation scope dr、dU2, then r, U2 screening scope are calculated, limit K sieve
Scope is selected, battery of r, U2, K value in the range of screening is filtered out from primary screening battery,dr=10%, dU2=0.19%, r screening scope are 0.72-0.88m Ω, U2 sieve
It is 0 ＜ K to select the screening scope that scope is 3.585-3.599V, K<1mV/ days.
A kind of method for group matching for lifting ternary Li-ion batteries piles uniformity, comprises the following steps：Take according to above-mentioned screening
The cell 3000 that method filters out, will be single according to the order of R values from small to large according to the DC internal resistance R of cell
Body battery is divided into 3 sections, is denoted as 1-3 shelves respectively, and stepping scheme is as follows：
1 grade：1.52mΩ≤R<1.57m Ω,
2 grades：1.57mΩ≤R<1.62m Ω,
3 grades：1.62mΩ≤R<1.67m Ω,
4 grades：1.67mΩ≤R<1.72m Ω,
5 grades：1.72mΩ≤R<1.75mΩ；
Every 3 cell parallels form a module, and the combo scheme of module is：122、222、333、444、455；
2820 are used altogether according to 3000 cells of this combo scheme, is made into 10 sets of battery bags, and cell utilizes
Rate is 94%.
The 10 sets of battery bags obtained to embodiment 2 carry out 0.5C charge-discharge performance tests, record discharge capacity and end pressure
Difference, as a result such as table 1：
The discharge capacity of 10 sets of battery bags, electric discharge end pressure differential detection result in the embodiment 2 of table 1
The discharge capacity of each set battery pack obtained as can be seen from Table 1 through present invention screening, combo, electric discharge end pressure difference
Uniformity it is good.
Comparative example 2
According in the discharge capacity C1 of the multiple rated capacity C=25Ah of method measure of embodiment 2 cell, battery
Hinder r, open-circuit voltage U2, self-discharge rate K；According still further to traditional battery core screening mode, the screening scope for determining C1, r, U2, K is respectively
25.75-27.5Ah, 0.5-1.1m Ω, 3.580-3.600V, 0 ＜ K<1mV/ days, qualified cell 3000 is filtered out,
According to traditional stepping method, according to the discharge capacity C1 steppings of cell, it is divided into 5 sections, is denoted as 1-5 shelves, stepping respectively
Scheme is as follows：
1 grade：25.75Ah≤C1<26.1Ah,
2 grades：26.1Ah≤C1<26.45Ah,
3 grades：26.45Ah≤C1<26.8Ah,
4 grades：26.8Ah≤C1<27.15Ah,
5 grades：27.15Ah≤C1≤27.5Ah；
Every 3 cell parallels form a module, and the combo scheme of module is：122、222、333、444、455；
2256 are used altogether according to 3000 cells of this combo scheme, are made into 8 sets of battery bags, cell utilization rate
For 75.2%.
8 sets of battery bags that comparative example 2 is obtained carry out 1C charge-discharge performance tests, record discharge capacity and end pressure difference,
As a result such as table 2：
The discharge capacity of 8 sets of battery bags, electric discharge end pressure differential detection result in the comparative example 2 of table 2
Discharge capacity, the electric discharge end pressure of each set battery pack obtained as can be seen from Table 2 through tradition screening, method for group matching
The uniformity of difference is poor.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (9)
1. a kind of screening technique for lifting ternary Li-ion batteries piles uniformity, it is characterised in that comprise the following steps：
S1, under room temperature state, by multiple rated capacities be C cell carry out 3 0.1C-1.5C charge-discharge magnifications follow
Ring, the carrying capacity SOC of battery is finally arranged to 20-65%, and the 10s that discharges, each cell is determined in third time discharge and recharge
When constant current be filled with ratio, discharge capacity C1 and discharge 10s DC internal resistance R；
Internal resistance of cell r, open-circuit voltage U2, the self-discharge rate K for the cell that S2, each rated capacity of measure are C；
Filter out that C1 is 1.03C to 1.07C, constant current is filled with than for 94- in S3, the cell for being C from multiple rated capacities
98% cell is designated as primary screening battery；Calculate r, U2, K of primary screening battery average value
And limit r, U2 relative deviation scope dr、dU2, then r, U2 screening scope are calculated, limit K screening scope, from once sieving
The battery that r, U2, K value are filtered out in battery in the range of screening is selected, wherein, r screening scope isU2 screening scope is
2. the screening technique of ternary Li-ion batteries piles uniformity is lifted according to claim 1, it is characterised in that in S1
In, carry out 3 0.5C charge-discharge magnifications circulations.
3. the screening technique of lifting ternary Li-ion batteries piles uniformity according to claim 1 or claim 2, it is characterised in that
In S1, carrying capacity SOC is 50%.
4. according to the screening technique of any one of the claim 1-3 lifting ternary Li-ion batteries piles uniformity, its feature exists
In, in S3, drFor 2%-10%, dU2For 0-0.5%, K screening scope is 0 ＜ K<1mV/ days.
5. according to the screening technique of any one of the claim 1-4 lifting ternary Li-ion batteries piles uniformity, its feature exists
In in S2, r, U2, K assay method are：The cell that rated capacity is C is placed t1 days in room temperature environment, determined
Open-circuit voltage U1, the internal resistance of cell r of battery；The cell that rated capacity is C is placed t2 days in room temperature environment, measure electricity
The open-circuit voltage U2 in pond, calculate self-discharge rate K, K=(U2-U1)/(t2-t1).
6. the screening technique of ternary Li-ion batteries piles uniformity is lifted according to claim 5, it is characterised in that 1≤t1
≤3。
7. according to the screening technique of the lifting ternary Li-ion batteries piles uniformity of claim 5 or 6, it is characterised in that 2≤
t2≤14。
8. a kind of method for group matching for lifting ternary Li-ion batteries piles uniformity, it is characterised in that comprise the following steps：Take according to
Multiple cells that any one of the claim 1-7 screening techniques filter out, according to the DC internal resistance R of cell, press
Cell is divided into n section according to the order of R values from small to large, is denoted as 1 grade, 2 grades ... n shelves respectively；2 grades to n-1 shelves
Cell carries out identical gear battery combo, and 1 grade carries out mixing combo, the monomer of n shelves and n-1 shelves with 2 grades of cell
Battery carries out mixing combo.
9. the method for group matching of ternary Li-ion batteries piles uniformity is lifted according to claim 8, it is characterised in that 2≤n≤
8。
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| 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 |
| CN112474438A (en) * | 2020-11-20 | 2021-03-12 | 珠海冠宇电池股份有限公司 | Battery grouping method |
| CN113067045A (en) * | 2021-03-25 | 2021-07-02 | 江西安驰新能源科技有限公司 | Matching method for reducing dynamic pressure difference of power lithium battery pack |
| CN113967609A (en) * | 2021-10-09 | 2022-01-25 | 上海空间电源研究所 | Screening and matching method of high-power lithium ion batteries for carrier rocket |
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Effective date of registration: 20191226 Address after: 230601 HENGCHUANG Intelligent Technology Park, 3959 Susong Road, Hefei Economic and Technological Development Zone, Anhui Province Patentee after: Hefei GuoXuan Battery Co., Ltd Address before: 230000 No. 599 Dai River Road, New Station District, Anhui, Hefei Patentee before: Hefei Guoxuan Gaoke Power Energy Co., Ltd. |
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