CN104155524B - Detection method for quality of lithium battery pole piece - Google Patents
Detection method for quality of lithium battery pole piece Download PDFInfo
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- CN104155524B CN104155524B CN201310698102.0A CN201310698102A CN104155524B CN 104155524 B CN104155524 B CN 104155524B CN 201310698102 A CN201310698102 A CN 201310698102A CN 104155524 B CN104155524 B CN 104155524B
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- point
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- pole piece
- coating
- centrage
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 title abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012372 quality testing Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a detection method for the quality of a lithium battery pole piece. The method comprises the steps of picking up points uniformly from a pole piece coating region, testing the resistance between a pole lug region and the points picked from the coating region, and then determining whether the coating is uniform by determining whether the resistance is uniformly distributed. The method can reflect the coating quality of the pole piece more objectively. The detection method provided by the invention facilitates the detection of the quality of the battery pole piece, and can provide feedback and guidance to process adjustment.
Description
Technical field
The present invention relates to lithium battery pole slice quality testing field, more particularly to a kind of lithium battery pole slice quality determining method.
Background technology
Lithium battery pole tablet quality affects extremely great to whole battery quality, and currently available technology is mainly from weight, thickness
Pole piece quality is detected in terms of degree two, but said method cannot react pole piece coating distributing homogeneity, the present invention is carried
A kind of lithium battery pole slice quality determining method is supplied, by detecting pole piece distribution of resistance, so as to reaction pole piece table definitely
Face quality, provides foundation for coating process adjustment.
The content of the invention
The purpose of the present invention is to propose to a kind of lithium battery pole slice quality determining method.Solve current pole piece quality testing side
Method cannot detect the pole piece coating distribution whether problem of uniformity, and the method for the present invention can intuitively show pole piece quality
Situation, the quality testing to coating has good effect.
A kind of lithium battery pole slice quality determining method, the method are comprised the following steps that：
A) pole piece containing lug area and applying area is taken, is taken a little by being uniformly distributed in applying area；
B) resistance between lug area and applying area each point is measured, resistance value is write down；
C) above-mentioned resistance value is compared with the bound threshold value of setting, judges the difference between each resistance value on the whole
It is different, if difference degree is in allowable range, judge pole coating area coating uniform；If difference degree exceeds can allow model
Enclose, then pole coating area coating is uneven.
Judge described in step c that the method for discrimination of the difference between each resistance value at least includes on the whole：Move according to X-MR
Dynamic extreme difference Stability Criteria：
The point of criterion one 1% is away from centrage more than 3 standard deviations；
The point of criterion two at least continuous 28% is located at centrage side；
At least continuous 24% point of criterion three rises or falls；
At least continuous 56% point of alternating of criterion four changes up and down；
, in the same side, the distance of 66% point distance center line is more than two standard deviations for criterion five；
In the same side, the distance of 80% point away from centrage is more than 1 standard deviation for criterion six；
Criterion seven is arranged in the range of 1 standard deviation of centrage in either side, at least continuous 60% point；
In either side, the distance of at least continuous 32% point away from centrage is more than 1 standard deviation to criterion eight；
Meet above-mentioned eight criterions at least one, then judge that stability is undesirable, coating is uneven.
The present invention effect be：The present invention detects the coating of applying area by the uniformity of detection pole coating area resistance
Quality, so as to reaction pole piece quality definitely, provides foundation for coating process adjustment.
By uniform Sample point collection, by sampled value do normal distribution in the hope of power taking resistance difference degree, so as to judge to apply
Whether cloth is uniform.This method sampling is simple, easy to operate, and the accuracy rate that normal distribution differentiates is high, and is easily adjusted quality handle
Control standard.
Description of the drawings
Fig. 1 is a kind of lithium battery pole piece structure schematic diagram of the present invention；
Fig. 2 takes the control chart figure of resistance value Xbar a little for applying area in specific embodiment of the invention pole piece 1；
Fig. 3 takes resistance value MR- control chart a little for applying area in specific embodiment of the invention pole piece 1；
Fig. 4 takes the control chart figure of resistance value Xbar a little for applying area in specific embodiment of the invention pole piece 2；
Fig. 5 takes resistance value MR- control chart a little for applying area in specific embodiment of the invention pole piece 2.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Lithium battery pole slice quality determining method is comprised the following steps that：
A) pole piece containing lug area and applying area is taken, is taken a little by being uniformly distributed in applying area；
B) resistance between lug area and applying area each point is measured, resistance value is write down；
C) above-mentioned resistance value is compared with the bound threshold value of setting, judges the difference between each resistance value on the whole
It is different, if difference degree is in allowable range, judge pole coating area coating uniform；If difference degree exceeds can allow model
Enclose, then pole coating area coating is uneven.
Judge described in step c that the method for discrimination of the difference between each resistance value at least includes on the whole：Move according to X-MR
Dynamic extreme difference Stability Criteria：
The point of criterion one 1% is away from centrage more than 3 standard deviations；
The point of criterion two at least continuous 28% is located at centrage side；
At least continuous 24% point of criterion three rises or falls；
At least continuous 56% point of alternating of criterion four changes up and down；
, in the same side, the distance of 66% point distance center line is more than two standard deviations for criterion five；
In the same side, the distance of 80% point away from centrage is more than 1 standard deviation for criterion six；
Criterion seven is arranged in the range of 1 standard deviation of centrage in either side, at least continuous 60% point；
In either side, the distance of at least continuous 32% point away from centrage is more than 1 standard deviation to criterion eight；
Meet above-mentioned eight criterions at least one, then judge that stability is undesirable, coating is uneven.
A specific embodiment of the lithium battery pole slice quality determining method of the present invention is presented herein below.
First, take the pole piece in area containing lug and applying area of two 100mm*100mm dimensions as described in Figure 1, will take
Sample pole piece is fixed in the plane for indicating X-Y directions dimension line.
Then, milliohmmeter is adjusted to into resistance grade, positive pole indicator is fixed on sampling pole-piece pole-ear area, and negative pole indicator is placed on and takes
The diverse location in sample pole coating area；The reading of measurement milliohmmeter indicator measurement table in diverse location；The applying area on pole piece,
Respectively take a little at 25 by being evenly distributed, data are described in table 1 below：
Table 1
The pole piece resistance value that diverse location is obtained is recorded in the Microsoft Excel of preset function, by monodrome-shifting
Dynamic range chart（X-MR）It is analyzed.The monodrome of pole piece 1-moving range control figure（X-MR）Such as table 2；The list of pole piece 2
Value-moving range control figure（X-MR）Such as table 3.
Monodrome-moving range control figure（X-MR）Computing formula：
Rs=|Xi-Xi+1| (i=1,2,3,……,k-1)
X-tube drawing boundary：CL=Xbar；UCL=Xbar+2.66Rbar；LCL=Xbar-2.66Rbar MR control chart boundaries：
CL=Rbar；UCL=3.267Rbar.
Table 2
Table 3
The resistance value Xbar control chart of specific embodiment pole piece 1 and pole piece 2 is respectively as shown in Figure 2, Figure 4 shows, and USL is resistance
The standard max of value, the standard min that LSL is resistance value；UCL, CL, LCL are distributed as the upper, middle and lower for calculating gained resistance value
Limit.As can be seen from Figure 2 applying area resistance value X of pole piece 1 is constantly near middle limit, sees that resistance value is distribution on the whole
Uniformly；And the applying area resistance value difference of pole piece 2, than larger, is not to distinguish near middle limit and some points in Fig. 4
Resistance value has exceeded the scope of lower limit, and these places are that coating is not enough in the defect that pole coating area reflects, according to
X-MR moving ranges Stability Criteria one, it is known that this process is unstable, and product quality is undesirable.
Fig. 3, Fig. 5 are respectively the moving range MR control chart of specific embodiment pole piece 1 and pole piece 2, can from Fig. 3
Go out, 25 point moving ranges all very littles that the applying area of pole piece 1 is taken, no more than 0.8, each sample point distribution of resistance is uniform；And
In Fig. 5, the extreme difference of 25 sample points is not of uniform size, and great majority limit CL in deviate from calculating, and distribution of resistance is uneven, according to X-MR
Moving range Stability Criteria one, it is known that this process is unstable, and product quality is undesirable.
Claims (2)
1. a kind of lithium battery pole slice quality determining method, it is characterised in that the method is comprised the following steps that：
A, a pole piece containing lug area and applying area is taken, taken a little by being uniformly distributed in applying area；
Resistance between b, measurement lug area and applying area each point, writes down resistance value；
C, by above-mentioned resistance value with setting bound threshold value compare, judge the difference between each resistance value on the whole, if
Difference degree judges pole coating area coating uniform in allowable range, then；If difference degree exceeds allowable range, pole
Piece applying area coating is uneven.
2. lithium battery pole slice quality determining method according to claim 1, it is characterised in that：Described in step c on the whole
Judge that the method for discrimination of the difference between each resistance value at least includes：According to X-MR moving range Stability Criterias：
The point of criterion one 1% is away from centrage more than 3 standard deviations；
The point of criterion two at least continuous 28% is located at centrage side；
At least continuous 24% point of criterion three rises or falls；
At least continuous 56% point of alternating of criterion four changes up and down；
, in the same side, the distance of 66% point distance center line is more than two standard deviations for criterion five；
In the same side, the distance of 80% point away from centrage is more than 1 standard deviation for criterion six；
Criterion seven is arranged in the range of 1 standard deviation of centrage in either side, at least continuous 60% point；
In either side, the distance of at least continuous 32% point away from centrage is more than 1 standard deviation to criterion eight；
Meet above-mentioned eight criterions at least one, then judge that stability is undesirable, coating is uneven.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310698102.0A CN104155524B (en) | 2013-12-18 | 2013-12-18 | Detection method for quality of lithium battery pole piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310698102.0A CN104155524B (en) | 2013-12-18 | 2013-12-18 | Detection method for quality of lithium battery pole piece |
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| CN104155524A CN104155524A (en) | 2014-11-19 |
| CN104155524B true CN104155524B (en) | 2017-04-26 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110441476A (en) * | 2019-07-19 | 2019-11-12 | 合肥国轩高科动力能源有限公司 | A kind of method of Fast Evaluation coating uniformity |
| CN112985496A (en) * | 2021-02-05 | 2021-06-18 | 惠州亿纬锂能股份有限公司 | Consistency evaluation method of battery pole piece |
| CN114113228A (en) * | 2021-11-03 | 2022-03-01 | 元能科技（厦门）有限公司 | Method for evaluating coating uniformity of battery pole piece |
| CN114114044A (en) * | 2021-11-15 | 2022-03-01 | 天津市捷威动力工业有限公司 | Method for evaluating welding overcurrent reliability of tab-busbar module |
| CN114280371B (en) * | 2021-12-23 | 2024-03-12 | 合肥国轩高科动力能源有限公司 | Quality consistency detection method for lithium battery coated pole piece |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201083820Y (en) * | 2007-09-29 | 2008-07-09 | 深圳市比克电池有限公司 | Battery pole piece electric resistance test device |
| CN102200551A (en) * | 2010-09-10 | 2011-09-28 | 万向电动汽车有限公司 | Impedance test method and device for battery pole piece |
| CN102207479A (en) * | 2010-03-31 | 2011-10-05 | 深圳市比克电池有限公司 | Method for detecting dispersing uniformity of lithium ion battery slurry |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005044663A (en) * | 2003-07-23 | 2005-02-17 | Sony Corp | Solid electrolyte, lithium ion battery, and its manufacturing method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201083820Y (en) * | 2007-09-29 | 2008-07-09 | 深圳市比克电池有限公司 | Battery pole piece electric resistance test device |
| CN102207479A (en) * | 2010-03-31 | 2011-10-05 | 深圳市比克电池有限公司 | Method for detecting dispersing uniformity of lithium ion battery slurry |
| CN102200551A (en) * | 2010-09-10 | 2011-09-28 | 万向电动汽车有限公司 | Impedance test method and device for battery pole piece |
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Effective date of registration: 20160222 Address after: 213299 Jintan Road, Jintan District, Jiangsu, No. 88, No. Applicant after: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. Address before: 471003 Henan city of Luoyang province high tech Development Zone Binhe Road No. 66 Applicant before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. |
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Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: AVIC lithium Technology Co.,Ltd. Address before: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee before: AVIC lithium Technology Co.,Ltd. Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: Zhongchuangxin Aviation Technology Co.,Ltd. Address before: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee before: AVIC lithium Technology Co.,Ltd. |
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Effective date of registration: 20220422 Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: Zhongchuangxin Aviation Technology (Jiangsu) Co.,Ltd. Address before: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee before: Zhongchuangxin Aviation Technology Co.,Ltd. |
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