CN110276156B - Method and device for detecting moisture content of negative plate - Google Patents
Method and device for detecting moisture content of negative plate Download PDFInfo
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Abstract
The invention provides a method and a device for detecting the moisture content of a negative plate, wherein the method comprises the following steps: obtaining a peeling strength-moisture content characteristic model; obtaining the peeling strength of the negative plate to be detected; and obtaining the moisture content of the negative plate to be detected according to the peel strength and the peel strength-moisture content characteristic model. The method for detecting the moisture content of the negative plate is based on the relationship between the moisture content of the negative plate and the peeling strength of the negative plate, and the moisture content of the negative plate can be obtained by detecting the peeling strength of the negative plate, so that the physical harm to operators and the detection cost are reduced.
Description
Technical Field
The invention relates to a method and a device for detecting the moisture content of a negative plate, belonging to the technical field of lithium ion batteries.
Background
In the production process of the lithium ion battery, the moisture in the production environment must be strictly controlled, otherwise the moisture can react with the electrolyte, so that the adverse effects of poor capacity, short service life and even direct scrapping of the product are caused. Therefore, accurate detection of moisture in the negative electrode sheet is extremely important.
The method for detecting the moisture of the negative plate commonly adopted at present is to detect by using a Karl Fischer moisture tester, and aiming at the detection method, the following main defects exist: 1) the Karl-Fischer reagent is a solution mainly composed of iodine, sulfur dioxide, pyridine and methanol, wherein the volatility of the sulfur dioxide and the pyridine is extremely high, the harm to human bodies is great, particularly when the reagent is replaced, the harm of some operators to the reagent is not enough, and the reagent is poured into and poured out at will without any protective measures, so that the potential safety hazard is extremely great; 2) Carl-Fisher has high requirements on freshness actually, and the storage life can be prolonged only by storing in the dark; 3) whether the titration of the Karl-Fischer reagent is accurately calibrated or not is directly related to the accuracy of sample determination, so that the titration needs to be calibrated before sample detection every day, and the operation complexity is high; 4) since the electrode is a key component of the karl fischer moisture meter and the contamination of the electrode surface directly causes the sensitivity to be lowered, the measurement accuracy may be directly affected by the slowness of the reaction observed although the contamination on the electrode is not visible.
Therefore, a method for detecting the moisture content of the negative plate, which can reduce the physical harm to operators and is beneficial to reducing the workshop cost, is urgently needed in the field.
Disclosure of Invention
The invention provides a method for detecting the moisture content of a negative plate, which can reduce the use frequency of operators on toxic chemical reagents and is beneficial to reducing the workshop cost. Meanwhile, the coating has a certain positive effect on environmental protection.
The invention also provides a device for detecting the moisture content of the negative plate, which not only can reduce the use frequency of operators on toxic chemical reagents, but also is beneficial to reducing the workshop cost. Meanwhile, the coating has a certain positive effect on environmental protection.
The invention provides a method for detecting moisture of a negative plate, which comprises the following steps:
obtaining a peeling strength-moisture content characteristic model;
obtaining the peeling strength of the negative plate to be detected;
and obtaining the moisture content of the negative plate to be detected according to the peel strength and the peel strength-moisture content characteristic model.
The method for detecting moisture in the negative electrode sheet, wherein the obtaining of the peel strength-moisture content characteristic model, comprises:
obtaining a negative plate sample from a negative plate group to be detected;
acquiring the moisture content and the peel strength of the negative plate sample;
and establishing the peel strength-moisture content characteristic model according to the moisture content and the peel strength of the negative plate sample.
The method for detecting moisture in the negative electrode plates, wherein the negative electrode plates in the group of negative electrode plates to be detected are in the same batch.
The method for detecting moisture in the negative electrode plate, wherein the number of the negative electrode plate samples is 5-10% of the total number of the negative electrode plates in the negative electrode plate group.
The method for detecting the moisture of the negative plate is characterized in that the fitting degree of the peel strength-moisture content characteristic model is not lower than 0.4.
The invention provides a device for detecting moisture of a negative plate, which comprises:
the first acquisition module is used for acquiring a peeling strength-moisture content characteristic model;
the second acquisition module is used for acquiring the peeling strength of the negative plate to be detected;
and the analysis module is used for obtaining the moisture content of the negative plate to be detected according to the peel strength and the peel strength-moisture content characteristic model.
The device for detecting moisture in the negative plate, wherein the first acquiring module comprises:
the sample acquisition unit is used for acquiring a negative plate sample from a negative plate group to be detected;
the parameter acquisition unit is used for acquiring the moisture content and the peeling strength of the negative plate sample;
And the establishing unit is used for establishing the peeling strength-moisture content characteristic model according to the moisture content and the peeling strength of the negative plate sample.
The device for detecting moisture in the negative electrode plates, wherein the negative electrode plates in the group of negative electrode plates to be detected are in the same batch.
The device for detecting moisture in the negative electrode plate is characterized in that the number of the negative electrode plate samples is 5-10% of the total number of the negative electrode plates in the negative electrode plate group.
The device for detecting moisture in the negative electrode sheet, wherein the fitting degree of the peel strength-moisture content characteristic model is not lower than 0.4.
The implementation of the invention has at least the following advantages:
1) according to the method for detecting the moisture content of the negative plate, the moisture content of the negative plate can be obtained by detecting the peel strength of the negative plate on the basis of the relation between the moisture content of the negative plate and the peel strength of the negative plate, so that the frequency of detecting the moisture content of the negative plate by using a Karl Fischer method can be reduced, and the harm to the body of an operator is reduced;
2) the method for detecting the moisture content of the negative plate obviously reduces the application frequency of the Karl Fischer reagent, thereby reducing the use cost and the maintenance cost of the Karl Fischer reagent and being beneficial to reducing the production detection cost of the negative plate;
3) The method for detecting the moisture content of the negative plate avoids the high-frequency application of a Karl Fischer moisture tester, so that the pollution degree to the surface of the electrode can be reduced, the service life of the electrode can be prolonged, and the accuracy of electrode measurement can be ensured;
4) the method for detecting the moisture content of the negative plate can quickly and accurately detect the moisture content of the negative plate, does not need large-scale or complex processing equipment, is simple and easy to implement, and can be popularized and applied on a large scale.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for detecting moisture in a negative electrode sheet according to the present invention;
FIG. 2 is a flowchart illustrating a method for detecting moisture in a negative electrode plate according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of the negative plate moisture content detection device according to the invention;
FIG. 4 is a schematic structural diagram of a negative plate moisture content detection device according to another embodiment of the present invention;
FIG. 5 is a fitting line graph in the embodiment 1 of the present invention;
fig. 6 is a fitting line graph in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages 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 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.
Fig. 1 is a flowchart of an embodiment of a method for detecting moisture content of a negative electrode sheet according to the present invention, and as shown in fig. 1, the method for detecting moisture content of a negative electrode sheet according to the present embodiment includes:
s101: obtaining a peeling strength-moisture content characteristic model;
wherein the peel strength-moisture content characteristic model is a model for indicating a relationship between the peel strength and the moisture content of the negative electrode sheet.
On the basis of the peel strength-moisture content characteristic model, when the peel strength of the negative electrode sheet is known, the moisture content of the negative electrode sheet can be obtained through the peel strength of the negative electrode sheet; alternatively, when the moisture content of the negative electrode sheet is known, the peel strength of the negative electrode sheet can be obtained from the moisture content of the negative electrode sheet.
S102: obtaining the peeling strength of the negative plate to be detected;
the negative plate to be detected is the negative plate to be detected for the water content.
In one embodiment, the measurement may be performed by a peel strength tester, so as to obtain the peel strength of the negative electrode sheet to be detected.
S103: and obtaining the moisture content of the negative plate to be detected according to the peel strength and the peel strength-moisture content characteristic model.
After the peel strength-moisture content characteristic model and the peel strength of the negative electrode plate to be detected are obtained, the peel strength can be substituted into the peel strength-moisture content characteristic model, so that the moisture content of the negative electrode plate to be detected is obtained.
The method for detecting the moisture content of the negative plate in the embodiment is based on the relationship between the peeling strength and the moisture content of the negative plate, the moisture content of the negative plate to be detected can be quickly obtained by detecting the peeling strength of the negative plate to be detected, and the detection of the peeling strength of the negative plate is simple and easy, and chemical reagents are not required to be utilized, so that the method for detecting the moisture content of the negative plate in the embodiment is simple and convenient to operate and high in detection efficiency, can effectively avoid the heavy use of the chemical reagents by operators, particularly the heavy use of Karl-Fischer reagents, and reduces the physical harm to the operators.
Fig. 2 is a flowchart of a method for detecting moisture content in a negative electrode sheet according to another embodiment of the present invention, and as shown in fig. 2, the method provided in this embodiment further explains the above embodiment on the basis of the above embodiment, and S101 specifically includes:
s201: obtaining a negative plate sample from a negative plate group to be detected;
a plurality of negative plates can be selected from the group of negative plates to be detected as negative plate samples. The negative plate group to be detected refers to a set of a plurality of negative plates to be detected.
S202: acquiring the moisture content and the peel strength of the negative plate sample;
And detecting the moisture content and the peeling strength of each negative plate sample to obtain the moisture content and the peeling strength of each negative plate sample. The peel strength may be detected as described above, and the moisture content may be detected by a commonly used detection method at the present stage, and the specific detection method is not limited in this embodiment.
Specifically, when the peel strength and the moisture content of each negative plate sample are detected, the peel strength and the moisture content can be respectively detected once, so as to be used as detection values of the peel strength and the moisture content of the negative plate sample; the peel strength and the moisture content of the negative plate sample can also be detected for multiple times, so that the average value of the detection results of the multiple times is used as the detection value of the peel strength and the moisture content of the negative plate sample.
S203: and establishing a peel strength-moisture content characteristic model according to the moisture content and the peel strength of the negative plate sample.
According to the operation of S202 described above, the measured values of the peel strength and the moisture content of each negative electrode sheet sample were obtained.
In one embodiment, curve fitting may be performed by using the detected values of the peel strength and the moisture content of each negative electrode sheet sample as coordinates, and an equation of the curve is obtained according to the curve obtained by fitting, where the equation is a peel strength-moisture content characteristic model.
Specifically, a plurality of coordinate points can be obtained by taking the moisture content detection values of the plurality of negative plate samples as the ordinate and taking the peel strength detection values of the plurality of negative plate samples as the abscissa, and curve simulation is performed on the plurality of coordinate points, wherein an equation of the curve is the peel strength-moisture content characteristic model.
When curve simulation is performed according to the coordinate points, the fitting degree of the curve needs to be limited. When the fitting degree is more than or equal to 0.4, an equation of the curve can be used as a peeling strength-moisture content characteristic model; if the fitting degree is lower than 0.4, the negative plate samples can be reselected or the number of the negative plate samples can be increased to obtain a peeling strength-moisture content characteristic model with proper fitting degree.
In order to obtain the peeling strength-moisture content characteristic model with high accuracy as quickly as possible, the specific number of the negative plate samples can be enlarged, for example, the number of the negative plate samples is 5-10% of the total number of the negative plates in the negative plate group.
In another embodiment, a neural network algorithm may be adopted to train the detection values of the peel strength and the moisture content of the negative plate samples, so as to obtain a peel strength-moisture characteristic model. In practical applications, a neural network training model that is currently commercially used may be used, for example, a neural network model in Matlab software may be used.
In the specific training process, the peel strength-moisture content characteristic model can be calculated by using the detection values of the peel strength and the moisture content of a plurality of negative plate samples as training samples, the coefficients of all parameters in the model are determined, the detection values of the peel strength and the moisture content of part of the negative plate samples are used as verification samples, the model obtained by training is tested, and whether the model meets the corresponding requirements or not is judged. When a neural network model in Matlab is adopted for training, and the fitting degree after training exceeds 0.4, the peel strength-moisture content characteristic model can be applied.
The two ways of obtaining the peel strength-moisture content characteristic model can be selected according to the specific number of the negative plates in the negative plate group to be detected. When the specific number of the negative plates in the negative plate group to be detected is less than 5000, a peeling strength-moisture content characteristic model can be obtained in a first optional mode; when the specific number of the negative plates in the negative plate group to be detected is more than 5000, the peeling strength-moisture content characteristic model can be obtained in a second optional mode.
In addition, in order to further ensure the detection precision of the moisture content of the negative plates to be detected, the negative plates in the group of negative plates to be detected are in the same batch.
Specifically, the fact that all the negative plates in the group of negative plates to be detected are of the same batch means that the preparation raw materials of all the negative plates in the group of negative plates to be detected are the same.
When the negative plates in the negative plate group to be detected are in the same batch, the peeling strength-moisture content characteristic model obtained from the negative plate sample in the negative plate group to be detected can more accurately display the relationship between the peeling strength and the moisture content of the batch of negative plates to be detected, so that the accuracy of the moisture content of the negative plates to be detected obtained according to the method of the embodiment can be further ensured.
Therefore, the method of the embodiment can quickly establish the peel strength-moisture content characteristic model based on the negative electrode plate group to be detected, so that the moisture content of each negative electrode plate to be detected can be efficiently detected. In addition, when all the negative plates in the group of negative plates to be detected are in the same batch, the detection accuracy of the moisture content of the negative plates to be detected in the embodiment can be further improved.
Fig. 3 is a schematic structural diagram of the negative plate moisture content detection device according to an embodiment of the present invention. As shown in fig. 3, the negative electrode sheet moisture content detection device provided in this embodiment includes:
A first obtaining module 301, a second obtaining module 302 and a parsing module 303.
The first obtaining module 301 is configured to obtain a peel strength-moisture content characteristic model; the second obtaining module 302 is configured to obtain the peel strength of the negative plate to be detected; the analysis module 303 is configured to obtain the moisture content of the negative electrode sheet to be detected according to the peel strength and the peel strength-moisture content characteristic model.
The negative plate moisture content detection device provided in this embodiment can be used to execute the negative plate moisture content detection method shown in fig. 1, and the implementation manner and the principle thereof are the same, and are not described again.
Fig. 4 is a schematic structural diagram of a negative plate moisture content detection device according to another embodiment of the invention. The apparatus shown in fig. 4 is based on that shown in fig. 3, and the first obtaining module includes: a sample acquisition unit 401, a parameter acquisition unit 402, and a setup unit 403.
The sample obtaining unit 401 is configured to obtain a negative plate sample from a negative plate group to be detected; the parameter obtaining unit 402 is configured to obtain the moisture content and the peel strength of the negative plate sample; the establishing unit 403 is configured to establish a peel strength-moisture content characteristic model according to the moisture content and the peel strength of the negative plate sample.
Optionally, when the obtaining unit 401 obtains the negative plate samples from the negative plate group to be detected, the number of the negative plate samples may be 5-10% of the total number of the negative plates in the negative plate group to be detected;
further, the negative plates in the group of negative plates to be detected are of the same batch.
Further, the establishing unit 403 is configured to establish a fitting degree of a peel strength-moisture content characteristic model based on the moisture content of the negative plate sample and the peel strength, wherein the fitting degree is not lower than 0.4.
The negative plate moisture content detection device provided in this embodiment can be used to execute the negative plate moisture content detection method shown in fig. 2, and the implementation manner and the principle thereof are the same, and are not described again.
The method for detecting the moisture content of the negative electrode sheet according to the present invention is described in detail below with reference to specific examples.
Example 1
1. Establishment of peel strength-moisture content characteristic model
After the production of the negative plates is completed, the negative plates of 250 in total are dried, 20 negative plates are selected as negative plate samples, the water content of the negative plate samples is measured by a Karl Fischer moisture tester, and the 180-degree peel strength is measured by a friction peel tester.
The moisture content and peel strength of the 20 negative plate samples are shown in table 1.
TABLE 1
| Pole piece serial number | Peel strength (KN/m) | Moisture content (ppm) |
| 1 | 0.0425 | 300 |
| 2 | 0.057 | 350 |
| 3 | 0.049 | 323.1 |
| 4 | 0.049 | 380 |
| 5 | 0.0575 | 406 |
| 6 | 0.066 | 379.4 |
| 7 | 0.061 | 415.5 |
| 8 | 0.051 | 319 |
| 9 | 0.042 | 344.3 |
| 10 | 0.06 | 411.3 |
| 11 | 0.058 | 365.6 |
| 12 | 0.06 | 409 |
| 13 | 0.052 | 403 |
| 14 | 0.055 | 380 |
| 15 | 0.045 | 300 |
| 16 | 0.046 | 350 |
| 17 | 0.065 | 430 |
| 18 | 0.06 | 370 |
| 19 | 0.058 | 396 |
| 20 | 0.062 | 420 |
Curve fitting was performed using the data in table 1 above to obtain a fitted straight line as shown in fig. 5. Fig. 5 is a fitting line graph in embodiment 1 of the present invention. Wherein, the fitting linear equation is that y is 4219.3x +141.39, and the fitting degree is 0.59.
That is, the peel strength-moisture content characteristic model of the present example is y-4219.3 x +141.39
2. Verification of peel strength-moisture content characteristic model
And selecting 10 negative electrode plates from the remaining 230 negative electrode plates as verification samples, respectively measuring the moisture content of the 10 negative electrode plate verification samples by using a Karl Fischer moisture tester, and measuring the 180-degree peel strength by using a friction peel tester.
Moisture content W of 10 validation samples1And peel strength are shown in table 2.
Then, the peel strength of 10 verification samples is substituted into the peel strength-moisture content characteristic model to obtain the calculated value W of the moisture content of 10 verification samples2The results are shown in Table 2.
TABLE 2
As can be seen from Table 2: the difference between the calculated value of the moisture content and the detected value of the moisture content is small, so that the method for detecting the moisture content of the negative electrode plate in the embodiment can realize accurate detection of the moisture content of the negative electrode plate, that is, derivation of the moisture content through the peel strength of the negative electrode plate has application significance.
Example 2
1. Establishment of peel strength-moisture content characteristic model
After the production of the negative plates is completed, the negative plates of 250 in total are dried, 20 negative plates are selected as negative plate samples, the water content of the negative plate samples is measured by a Karl Fischer moisture tester, and the 180-degree peel strength is measured by a friction peel tester.
The moisture content and peel strength of the 20 negative plate samples are shown in table 3.
TABLE 3
Curve fitting was performed using the data in table 3 above to obtain a fitted straight line as shown in fig. 6. Fig. 6 is a fitting line graph in embodiment 2 of the present invention. Wherein, the fitting linear equation is that y is 2288.3x +254.22, and the fitting degree is 0.40.
That is, the peel strength-moisture content characteristic model of the present example is y-2288.3 x +254.22
2. Verification of peel strength-moisture content characteristic model
And selecting 10 negative electrode plates from the remaining 230 negative electrode plates as verification samples, respectively measuring the moisture content of the 10 negative electrode plate verification samples by using a Karl Fischer moisture tester, and measuring the 180-degree peel strength by using a friction peel tester.
Moisture content W of 10 validation samples1And peel strength are shown in table 4.
Then, the peel strength of 10 verification samples is substituted into the peel strength-moisture content characteristic model to obtain the calculated value W of the moisture content of 10 verification samples2The results are shown in Table 4.
TABLE 4
From table 4, it is known that: the difference between the calculated value of the moisture content and the detected value of the moisture content is small, so that the method for detecting the moisture content of the negative electrode plate in the embodiment can realize accurate detection of the moisture content of the negative electrode plate, that is, derivation of the moisture content through the peel strength of the negative electrode plate has application significance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The method for detecting the moisture content of the negative plate is characterized by comprising the following steps:
obtaining a peeling strength-moisture content characteristic model;
Obtaining the peeling strength of the negative plate to be detected;
obtaining the moisture content of the negative plate to be detected according to the peel strength and the peel strength-moisture content characteristic model;
the obtaining of the peel strength-moisture content characteristic model comprises the following steps:
obtaining a negative plate sample from a negative plate group to be detected;
acquiring the moisture content and the peel strength of the negative plate sample;
and establishing the peel strength-moisture content characteristic model according to the moisture content and the peel strength of the negative plate sample.
2. The negative plate moisture content detection method according to claim 1, wherein the number of the negative plate samples is 5-10% of the total number of the negative plates in the negative plate group to be detected.
3. The negative electrode plate moisture content detection method according to claim 1 or 2, wherein the negative electrode plates in the group of negative electrode plates to be detected are of the same batch.
4. The negative plate moisture content detection method according to claim 1, wherein the fitting degree of the peel strength-moisture content characteristic model is not less than 0.4.
5. The negative plate moisture content detection device is characterized by comprising:
the first acquisition module is used for acquiring a peel strength-moisture content characteristic model;
The second acquisition module is used for acquiring the peeling strength of the negative plate to be detected;
the analysis module is used for obtaining the moisture content of the negative plate to be detected according to the peel strength and the peel strength-moisture content characteristic model;
the first obtaining module comprises:
the sample acquisition unit is used for acquiring a negative plate sample from a negative plate group to be detected;
the parameter acquisition unit is used for acquiring the moisture content and the peeling strength of the negative plate sample;
and the establishing unit is used for establishing the peeling strength-moisture content characteristic model according to the moisture content and the peeling strength of the negative plate sample.
6. The negative plate moisture content detection device according to claim 5, wherein the number of the negative plate samples is 5-10% of the total number of the negative plates in the negative plate group.
7. The negative electrode plate moisture content detection device according to claim 5 or 6, wherein the negative electrode plates in the group of negative electrode plates to be detected are of the same batch.
8. The negative plate moisture content detection device according to claim 5, wherein the fitting degree of the peel strength-moisture content characteristic model is not less than 0.4.
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