CN114061454A - Evaluation method for dynamic stability of lithium ion battery coating CCD (Charge coupled device) measuring system - Google Patents
Evaluation method for dynamic stability of lithium ion battery coating CCD (Charge coupled device) measuring system Download PDFInfo
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- CN114061454A CN114061454A CN202111327538.XA CN202111327538A CN114061454A CN 114061454 A CN114061454 A CN 114061454A CN 202111327538 A CN202111327538 A CN 202111327538A CN 114061454 A CN114061454 A CN 114061454A
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- 238000000576 coating method Methods 0.000 title claims abstract description 46
- 239000011248 coating agent Substances 0.000 title claims abstract description 45
- 238000011156 evaluation Methods 0.000 title claims abstract description 26
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000004458 analytical method Methods 0.000 claims abstract description 16
- 239000011888 foil Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- 238000004590 computer program Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000003324 Six Sigma (6σ) Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- -1 nickel metal hydride Chemical class 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the field of lithium ion battery coating detection, in particular to an evaluation method for dynamic stability of a lithium ion battery coating CCD (charge coupled device) measurement system, which comprises the following steps: s1, preparing materials, and sticking the standard parts with set sizes on the foil; s2, enabling the coating closed loop to operate, detecting the size of the standard part by using the CCD measuring system for the first set times, carrying out MSA analysis on the measured data, obtaining the linear data of the CCD measuring system, and outputting the linear evaluation of the CCD measuring system; s3, the coating closed loop is operated, the CCD measuring system is used for detecting the size of the standard part by the second set times, MSA analysis is carried out on the measured data, and the repeatability evaluation of the CCD measuring system is output after the repeatability data of the CCD measuring system is obtained; and S4, outputting the dynamic stability evaluation of the CCD measuring system according to the linearity and repeatability evaluation of the CCD measuring system. The invention enables the dynamic stability of the CCD measuring system to be accurately evaluated, thereby better managing the coating size in the production process of the lithium battery.
Description
Technical Field
The invention relates to the field of lithium ion battery coating detection, in particular to an evaluation method for dynamic stability of a lithium ion battery coating CCD (charge coupled device) measurement system.
Background
With the exhaustion of traditional energy and the increasingly prominent environmental problems, the development direction of lithium ion batteries as novel clean energy is more and more emphasized by governments and scientists, and the development and research of lithium ion batteries with more practical and efficient performance are continuously dedicated. Compared with the traditional lead storage battery and nickel metal hydride battery, the lithium ion battery has obvious advantages in cycle life, energy density, power density and environment-friendly performance. Although there is a gap in energy density from the fuel cell, the high manufacturing cost and the complicated production process of the fuel cell make it difficult to commercialize it. Therefore, the lithium ion battery is an ideal power source for future electric vehicles and hybrid batteries.
The coating size of the positive and negative pole pieces in the lithium ion battery is a key control point of the coating process, and the coating size directly influences the symmetric dislocation of coating, the battery capacity and the service life of the battery. Coating symmetry dislocation greatly increases the coating reject ratio of the subsequent process and increases scrappage; too large or too small a coating size may cause the positive electrode inside the battery to be not completely wrapped by the negative electrode, so that the positive electrode capacity cannot be exerted efficiently. In severe cases, lithium dendrites also form inside the battery, which easily pierce the separator to cause a short circuit inside the battery. There are many factors that affect the uniformity of the coating size, such as slurry, coating die, coating speed, etc. Therefore, the real-time control of the coating size in the production process is crucial to the performance of the lithium ion battery.
At present, the size of a pole piece is detected in real time by adopting a CCD (charge coupled device), but because the coating production process of a lithium battery is a dynamic process, the CCD is greatly influenced by external factors during real-time detection, and the dynamic stability requirement of a CCD detection system is higher, a method is needed for correctly evaluating the dynamic stability of a CCD measurement system, so that the coating size in the production process of the lithium battery is better controlled.
Disclosure of Invention
In order to solve the defects in the background technology, the invention provides an evaluation method for the dynamic stability of a lithium ion battery coating CCD measurement system, which comprises the following specific scheme:
a method for evaluating the dynamic stability of a lithium ion battery coating CCD measuring system comprises the following steps:
s1, preparing materials, and sticking the standard parts with set sizes on the foil;
s2, enabling the coating closed loop to operate, detecting the size of the standard part by using the CCD measuring system for the first set times, carrying out MSA analysis on the measured data, obtaining the linear data of the CCD measuring system, and outputting the linear evaluation of the CCD measuring system;
s3, the coating closed loop is operated, the CCD measuring system is used for detecting the size of the standard part by the second set times, MSA analysis is carried out on the measured data, and the repeatability evaluation of the CCD measuring system is output after the repeatability data of the CCD measuring system is obtained;
and S4, outputting the dynamic stability evaluation of the CCD measuring system according to the linearity and repeatability evaluation of the CCD measuring system.
Specifically, the number of the standard parts in step S1 is not less than ten and the distance between the standard parts is not less than one meter.
Specifically, the standard component is a soft black plastic material and is sized to cover the full operating range.
Specifically, the first set number of times is not less than ten times, and the second set number of times is not less than fifty times.
Specifically, step S2 specifically includes the following steps:
s2.1, acquiring linear data of the CCD measuring system;
s2.2, judging whether the offset P is larger than 0.05, if so, outputting that the linearity of the non-offset measurement system is acceptable, and if not, entering the next step;
s2.3, judging whether the linear P is less than 0.05, if not, outputting to be wireless, and if so, entering the next step, wherein the linearity of the CCD measuring system is unacceptable;
s2.4, judging whether the linear percentage is less than 5% and the deviation percentage is less than 10%, if so, outputting that the linearity of the CCD measuring system is acceptable; and if not, the output CCD measurement system is not acceptable in linearity.
Specifically, step S3 specifically includes the following steps:
s3.1, acquiring repeatability data of the CCD measuring system;
s3.2, judging whether the repeatability percentage is less than 15%, if so, outputting that the repeatability of the CCD measuring system is acceptable; and if not, the repeatability of the output CCD measuring system is unacceptable.
Specifically, step S4 specifically includes: judging whether the linearity and the repeatability of the CCD measuring system are all acceptable, if so, outputting that the dynamic stability of the CCD measuring system is acceptable; and if not, the stability of the output CCD measurement system is unacceptable.
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for evaluating dynamic stability of a coated CCD measurement system for a lithium ion battery as described above.
The invention has the beneficial effects that:
the invention provides an evaluation method of the dynamic stability of the CCD measuring system, so that the dynamic stability of the CCD measuring system can be accurately evaluated, and the coating size in the production process of a lithium battery can be better managed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a measurement report of example 1
Fig. 3 is a measurement report of example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses an evaluation method for dynamic stability of a lithium ion battery coating CCD (charge coupled device) measurement system, which comprises the following steps as shown in figure 1:
s1, preparing materials, and sticking the standard parts with set sizes on the foil;
s2, enabling the coating closed loop to operate, detecting the size of the standard part by using the CCD measuring system for the first set times, carrying out MSA analysis on the measured data, obtaining the linear data of the CCD measuring system, and outputting the linear evaluation of the CCD measuring system;
s3, the coating closed loop is operated, the CCD measuring system is used for detecting the size of the standard part by the second set times, MSA analysis is carried out on the measured data, and the repeatability evaluation of the CCD measuring system is output after the repeatability data of the CCD measuring system is obtained;
and S4, outputting the dynamic stability evaluation of the CCD measuring system according to the linearity and repeatability evaluation of the CCD measuring system.
In the step S1, the number of the standard components is not less than ten, and the distance between the standard components is not less than one meter.
The standard component is a black plastic soft material, and the size of the standard component covers the full working range.
The first set number of times is not less than ten times, and the second set number of times is not less than fifty times.
Step S2 specifically includes the following steps:
s2.1, acquiring linear data of the CCD measuring system;
s2.2, judging whether the offset P is larger than 0.05, if so, outputting that the linearity of the non-offset measurement system is acceptable, and if not, entering the next step;
s2.3, judging whether the linear P is less than 0.05, if not, outputting to be wireless, and if so, entering the next step, wherein the linearity of the CCD measuring system is unacceptable;
s2.4, judging whether the linear percentage is less than 5% and the deviation percentage is less than 10%, if so, outputting that the linearity of the CCD measuring system is acceptable; and if not, the output CCD measurement system is not acceptable in linearity.
Step S3 specifically includes the following steps:
s3.1, acquiring repeatability data of the CCD measuring system;
s3.2, judging whether the repeatability percentage is less than 15%, if so, outputting that the repeatability of the CCD measuring system is acceptable; and if not, the repeatability of the output CCD measuring system is unacceptable.
Step S4 specifically includes: judging whether the linearity and the repeatability of the CCD measuring system are all acceptable, if so, outputting that the dynamic stability of the CCD measuring system is acceptable; and if not, the stability of the output CCD measurement system is unacceptable.
Example 1
S1, preparing materials, and sticking the standard parts with set sizes on the foil;
and selecting a negative electrode coating CCD to carry out linear verification, coating an empty foil, placing a plurality of standard parts with determined sizes on the empty foil, wherein the positions of the standard parts are positioned at the junction of a coating and a blank during normal coating, and the distance between every two standard parts is larger than 1m, so that the CCD is convenient to measure.
S2, enabling the coating closed loop to operate, detecting the size of the standard part by using the CCD measuring system for the first set times, carrying out MSA analysis on the measured data, obtaining the linear data of the CCD measuring system, and outputting the linear evaluation of the CCD measuring system;
the coating closed loop is operated for 10 times, so that the CCD can repeatedly detect the size of the standard part under the dynamic condition. The data obtained were then analyzed, as shown in FIG. 2, and the CCD had a bias of < 0.05, indicating a bias, based on the six sigma linear analysis; the linearity P is less than 0.05, which indicates linearity; the percent linearity was < 5% and the bias% < 10%, indicating that the measurement system was linearly acceptable.
S3, the coating closed loop is operated, the CCD measuring system is used for detecting the size of the standard part by the second set times, MSA analysis is carried out on the measured data, and the repeatability evaluation of the CCD measuring system is output after the repeatability data of the CCD measuring system is obtained;
the coating closed loop is operated for 50 times, so that the CCD can repeatedly detect the size of the standard part under the dynamic condition. The data obtained were then analyzed and, as shown in fig. 3,% reproducibility was 11.82% and% reproducibility < 15%, so that the measurement system reproducibility was acceptable.
And S4, according to the linearity and repeatability evaluation result of the CCD measuring system, the CCD measuring system is acceptable.
Example 2
The conventional analysis of a lithium battery coating CCD measurement system is MSA analysis under a static state, and comprises the following steps:
selecting a negative coating CCD to analyze and verify the negative coating CCD, placing a standard part at a CCD detection position on the foil, stopping coating, repeatedly measuring a plurality of standard parts by the CCD, and performing MSA analysis on a measured result, wherein the result is shown in figure 3; the bias P is 0.918 and is more than 0.05, which indicates that the bias exists and the measuring system is acceptable; the repeatability is 1.35%, the repeatability is less than 15%, so the measurement system is acceptable.
Comparing MSA analysis results of the negative electrode coating CCD measuring system in a dynamic state and a static state, the stability of the measuring system in the static state and the dynamic state is different, and the measuring system is more superior in the static state. Therefore, the results of conventional static MSA analysis cannot be used to accurately evaluate the stability of the measurement system in the dynamic state.
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for evaluating dynamic stability of a coated CCD measurement system for a lithium ion battery as described above.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for evaluating the dynamic stability of a lithium ion battery coating CCD measuring system is characterized by comprising the following steps:
s1, preparing materials, and sticking the standard parts with set sizes on the foil;
s2, enabling the coating closed loop to operate, detecting the size of the standard part by using the CCD measuring system for the first set times, carrying out MSA analysis on the measured data, obtaining the linear data of the CCD measuring system, and outputting the linear evaluation of the CCD measuring system;
s3, the coating closed loop is operated, the CCD measuring system is used for detecting the size of the standard part by the second set times, MSA analysis is carried out on the measured data, and the repeatability evaluation of the CCD measuring system is output after the repeatability data of the CCD measuring system is obtained;
and S4, outputting the dynamic stability evaluation of the CCD measuring system according to the linearity and repeatability evaluation of the CCD measuring system.
2. The method of claim 1, wherein in step S1, the number of the standard components is not less than ten and the distance between the standard components is not less than one meter.
3. The method of claim 1, wherein the standard component is a soft black plastic material and has a size that covers a full operating range.
4. The method according to claim 1, wherein the first set number is not less than ten, and the second set number is not less than fifty.
5. The method for evaluating the dynamic stability of the coated CCD measuring system of the lithium ion battery according to claim 1, wherein the step S2 specifically comprises the following steps:
s2.1, acquiring linear data of the CCD measuring system;
s2.2, judging whether the offset P is larger than 0.05, if so, outputting that the linearity of the non-offset measurement system is acceptable, and if not, entering the next step;
s2.3, judging whether the linear P is less than 0.05, if not, outputting to be wireless, and if so, entering the next step, wherein the linearity of the CCD measuring system is unacceptable;
s2.4, judging whether the linear percentage is less than 5% and the deviation percentage is less than 10%, if so, outputting that the linearity of the CCD measuring system is acceptable; and if not, the output CCD measurement system is not acceptable in linearity.
6. The method for evaluating the dynamic stability of the coated CCD measuring system of the lithium ion battery according to claim 1, wherein the step S3 specifically comprises the following steps:
s3.1, acquiring repeatability data of the CCD measuring system;
s3.2, judging whether the repeatability percentage is less than 15%, if so, outputting that the repeatability of the CCD measuring system is acceptable; and if not, the repeatability of the output CCD measuring system is unacceptable.
7. The method for evaluating the dynamic stability of the coated CCD measuring system of the lithium ion battery according to claim 1, wherein the step S4 is specifically as follows: judging whether the linearity and the repeatability of the CCD measuring system are all acceptable, if so, outputting that the dynamic stability of the CCD measuring system is acceptable; and if not, the stability of the output CCD measurement system is unacceptable.
8. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements the steps of the method for evaluating dynamic stability of a lithium ion battery coated CCD measurement system according to any one of claims 1 to 7.
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|---|---|---|---|---|
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| CN108680111A (en) * | 2018-06-08 | 2018-10-19 | 东莞塔菲尔新能源科技有限公司 | A kind of reference substance for pole piece tilted object, preparation method and applications method |
| CN109636717A (en) * | 2018-10-30 | 2019-04-16 | 广州超音速自动化科技股份有限公司 | Lithium battery is coated with determination method, system, equipment and storage medium |
| CN110378542A (en) * | 2018-04-12 | 2019-10-25 | 南京理工大学 | Components measurement data statistical characteristic analysis method in error process |
| CN211234290U (en) * | 2019-12-16 | 2020-08-11 | 福建力和行智能科技有限公司 | Lithium battery pole piece size real-time online measurement mechanism |
| CN113569491A (en) * | 2021-08-13 | 2021-10-29 | 江苏集萃智能光电系统研究所有限公司 | Analysis and correction method and device for wheel set size detection data |
-
2021
- 2021-11-10 CN CN202111327538.XA patent/CN114061454A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101832753A (en) * | 2009-03-11 | 2010-09-15 | 深圳市吉阳自动化科技有限公司 | On-line detection system and method of lithium ion battery pole piece CCD |
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| CN110378542A (en) * | 2018-04-12 | 2019-10-25 | 南京理工大学 | Components measurement data statistical characteristic analysis method in error process |
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