CN111624136A - Method for detecting stability and viscosity of battery slurry - Google Patents
Method for detecting stability and viscosity of battery slurry Download PDFInfo
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- CN111624136A CN111624136A CN202010560688.4A CN202010560688A CN111624136A CN 111624136 A CN111624136 A CN 111624136A CN 202010560688 A CN202010560688 A CN 202010560688A CN 111624136 A CN111624136 A CN 111624136A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
Abstract
The invention discloses a method for detecting stability and viscosity of battery slurry, which comprises the following steps: s1, respectively sampling from the upper layer and the lower layer of the battery slurry, and recording as an upper layer sample and a lower layer sample; s2, respectively carrying out two test scans on the upper layer sample and the lower layer sample by using a rheometer to obtain 4 rheological curves; s3, analyzing the coincidence of the 4 rheological curves, and when the coincidence of the 4 curves is poor, indicating that the stability of the battery slurry is poor; when the coincidence of the 4 curves is good, the stability of the battery slurry is good, and the average value of the sample viscosities detected for 4 times is the viscosity of the battery slurry. The method is simple to operate, and can accurately evaluate the stability and viscosity value of the battery slurry.
Description
Technical Field
The invention relates to the technical field of battery slurry detection, in particular to a method for detecting the stability and viscosity of battery slurry.
Background
The lithium battery mainly includes: positive pole piece, negative pole piece, diaphragm, electrolyte, structure. Coating during the cell fabrication process is important in order to produce a good cell. The stable areal density can improve the capacity consistency of each cell. The stability and viscosity of the battery paste affect the stability of the areal density of the cell, and therefore need to be monitored.
And a viscosity value is tested singly, so that the stability of the slurry cannot be judged more accurately, the fluctuation of the surface density often occurs in the coating process, the capacity consistency of the electric core in the later period is greatly influenced, and the matching success rate of the battery is also influenced.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for detecting the stability and viscosity of battery slurry, the method is simple to operate, and the stability and viscosity value of the battery slurry can be accurately evaluated, so that the stability of a coating process is improved.
The invention provides a method for detecting stability and viscosity of battery slurry, which comprises the following steps:
s1, respectively sampling from the upper layer and the lower layer of the battery slurry, and recording as an upper layer sample and a lower layer sample;
s2, respectively carrying out two test scans on the upper layer sample and the lower layer sample by using a rheometer to obtain 4 rheological curves;
s3, analyzing the coincidence of the 4 rheological curves, and when the coincidence of the 4 curves is poor, indicating that the stability of the battery slurry is poor; when the coincidence of the 4 curves is good, the stability of the battery slurry is good, and the average value of the sample viscosities detected for 4 times is the viscosity of the battery slurry.
Preferably, in S2, the shear turns of the sample are reversed at the time of the two test scans.
Preferably, in S2, the first test scan, starting from 0S to 300S, detects the viscosity value once per second.
Preferably, in S2, a second test scan, beginning at 300S and ending at 0S, detects viscosity values once per second.
Preferably, in S2, the viscosity value detected at the 10 th second at the time of the first test scan is the viscosity of the sample.
Preferably, in S2, the viscosity value detected at 291 seconds at the time of the second test scan is the viscosity of the sample.
Preferably, in S2, the temperature of both test scans is 22-28 ℃.
Preferably, in S1, the temperature of the battery paste is 22-28 ℃.
Preferably, in S1, the weight of the upper layer sample and the lower layer sample is the same.
Preferably, in S1, the upper layer sample and the lower layer sample are each 4.5 to 5.5 g.
The battery slurry has no jelly state and no sedimentation phenomenon.
The stability of the battery slurry is judged by detecting the rheological curves of the upper layer and the lower layer of the whole battery slurry twice and comparing the coincidence of the 4 rheological curves, if the coincidence is good, the average value of the sample viscosities detected for 4 times is taken as the viscosity of the battery slurry, the whole process is simple to operate, the stability and the viscosity value of the battery slurry can be accurately evaluated, and the stability of the coating process is further improved.
The method can be used for rapidly and effectively judging the stability of the slurry, has a good monitoring effect on the surface density stability in the coating process, improves the production consistency and the later-stage matching yield, and can be used for well saving the cost.
Drawings
Fig. 1 is a rheological curve of a battery paste.
FIG. 2 is a graph showing the results of the areal density measurements during the coating process.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A method for detecting the stability and viscosity of a battery slurry, comprising the steps of:
s1, respectively sampling 5g of the upper layer and the lower layer of the battery slurry with the temperature of 25 ℃, and marking as an upper layer sample and a lower layer sample;
s2, respectively carrying out two test scans on the upper layer sample and the lower layer sample by using a rheometer to obtain 4 rheological curves; wherein, when the two times of test scanning are carried out, the shearing direction of the sample is opposite, and the test scanning temperature is 25 ℃;
the first test scanning is started from 0s to 300s, the viscosity value is detected once every second, and the viscosity value detected in the 10 th second is the viscosity of the sample;
the second test scanning is started from 300s to 0s, the viscosity value is detected once per second, and the viscosity value detected in 291 seconds is the viscosity of the sample;
s3, analyzing the coincidence of the 4 rheological curves, and when the coincidence of the 4 curves is poor, indicating that the stability of the battery slurry is poor; when the coincidence of the 4 curves is good, the stability of the battery slurry is good, and the average value of the sample viscosities detected for 4 times is the viscosity of the battery slurry.
The rheological curve of the battery slurry is shown in fig. 1, and fig. 1 is the rheological curve of the battery slurry; as can be seen from fig. 1, the coincidence of the 4 rheological curves is better, and the stability of the battery paste is better; the viscosity of the battery paste measured is shown in table 1:
the battery slurry was coated and the surface density of the coating was measured, and the results are shown in fig. 2, and fig. 2 is a graph of the surface density measurement results during the coating process, and it can be seen that the surface density stability of the pole piece was also good when the slurry with good stability was used for coating.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A method for detecting the stability and viscosity of battery slurry is characterized by comprising the following steps:
s1, respectively sampling from the upper layer and the lower layer of the battery slurry, and recording as an upper layer sample and a lower layer sample;
s2, respectively carrying out two test scans on the upper layer sample and the lower layer sample by using a rheometer to obtain 4 rheological curves;
s3, analyzing the coincidence of the 4 rheological curves, and when the coincidence of the 4 curves is poor, indicating that the stability of the battery slurry is poor; when the coincidence of the 4 curves is good, the stability of the battery slurry is good, and the average value of the sample viscosities detected for 4 times is the viscosity of the battery slurry.
2. The method for testing stability and viscosity of battery paste according to claim 1, wherein in S2, the shear direction of the sample is reversed in two test scans.
3. The method for testing stability and viscosity of battery paste according to claim 1 or 2, wherein in S2, the viscosity value is tested every second from 0S to 300S of the first test scan.
4. The method for testing the stability and viscosity of battery slurry according to any one of claims 1 to 3, wherein in S2, the viscosity value is measured once per second from the beginning of 300S to the end of 0S in the second test scan.
5. The method for testing stability and viscosity of battery slurry according to claim 3, wherein the viscosity value measured at 10 seconds at the time of the first test scan is the viscosity of the sample in S2.
6. The method for testing stability and viscosity of battery paste according to claim 4, wherein the viscosity value measured at 291 seconds at the second test scan is the viscosity of the sample in S2.
7. The method for testing the stability and viscosity of battery slurry according to any one of claims 1 to 6, wherein the temperature of the two test scans is 22 to 28 ℃ in S2.
8. The method for testing the stability and viscosity of battery paste according to any one of claims 1 to 7, wherein the temperature of the battery paste is 22 to 28 ℃ in S1.
9. The method for testing stability and viscosity of battery paste according to any one of claims 1 to 8, wherein in S1, the weight of the upper layer sample and the lower layer sample is the same.
10. The method for testing stability and viscosity of battery paste according to any one of claims 1 to 9, wherein in S1, the upper layer sample and the lower layer sample are 4.5 to 5.5g each.
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| CN202010560688.4A CN111624136A (en) | 2020-06-18 | 2020-06-18 | Method for detecting stability and viscosity of battery slurry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525771A (en) * | 2020-11-30 | 2021-03-19 | 湖北亿纬动力有限公司 | Battery slurry storage performance evaluation method |
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Application publication date: 20200904 |