What is the peel strength of 6s 100c lipo battery pole piece?

This is an article introducing the evaluation method of 6s 100c lipo battery pole piece peel strength and the influencing factors of 6s 100c lipo battery pole piece peel strength. CNHL, a lithium battery manufacturer, will give you a detailed introduction to the above content.

Brief introduction of peel strength of 6s 100c lipo battery

6s 100c lipo battery pole piece peel strength refers to the firmness of the pole piece active material and the current collector, which is one of the important indicators of the pole piece. The test of the peel strength of the pole piece can evaluate whether the use of the binder is reasonable, and the quality of the mixing and coating processes. The peel strength between the coating and the current collector also affects the cycle performance and internal resistance of the 6s 100c lipo battery.
Partners who are not familiar with lithium battery pole pieces can refer to the following articles, which can help you understand the rolling process of lithium battery pole pieces:
Summary of lipo battery 3s pole piece rolling process

6s 100c lipo battery electrode peel strength evaluation method

(1) Qualitative evaluation - cross-cut method:

Hold the cutting knife so that the knife is perpendicular to the surface of the 6s 100c lipo battery pole piece test plate, and successively form the specified number of cuts on the coating at a uniform cutting rate horizontally and vertically. substrate;
Remove the particles scraped from the surface, and use your fingers to flatten the adhesive tape above the grid;
Put the tape on for a period of time, hold the free end of the tape, and peel off the tape smoothly within 0.5 seconds to 1 second at an angle as close to 60° as possible.

(2) Quantitative evaluation - 180° peeling method

Fold the free end of the 6s 100c lipo battery pole piece in half by 180°, clamp the free end of the pole piece and the test plate on the upper and lower grippers respectively, and use the tensile testing machine in the same environment to carry out continuous testing at a tensile speed of 50mm/min. Peel off until the 6s 100c lipo battery pole piece and coating are completely separated, and the pole piece can be read directly.

Test method: Then stick a certain width of scotch tape on the bottom of the unscaled steel ruler after drying, and the end faces are flush; then stick the double-sided tape on the scotch tape, the length is the same as the width of the scotch tape, and the position is centered; , stick the test sample on the double-sided tape, the end faces are flush, and roll back and forth 3 times freely on the surface of the 6s 100c lipo battery pole piece with a pressure roller.
Fold the unattached end of the 6s 100c lipo battery negative electrode sheet of the experimental sample 180 degrees, clamp it on the upper holder of the tension machine, peel off the negative electrode sheet, and wait until the 6s 100c lipo battery polar sheet current collector and coating are completely separated , read the test results of peel strength, and take the average value of the BC segment in the stable stage as the peel strength value.

The above is the evaluation method of the peel strength of the lithium battery pole piece. Regarding the lithium battery pole piece, the following article introduces in detail the common defect types of the ipo battery pole piece and their influence and detection:
Common 4s lipo battery pole piece defect types and their influence and detection

Influencing factors of peel strength of pole piece of 6s 100c lipo battery

The factors affecting the peel strength of the 6s 100c lipo battery are mainly divided into test factors and process factors. Due to space reasons, CNHL will introduce the former to you today. As for the process factors, I will write a separate article in a later article.

(1) Influence of 6s 100c lipo battery pole piece width on peel strength

When the width of the 6s 100c lipo battery pole piece is 20-35mm, with the increase of the width of the negative pole piece of the 6s 100c lipo battery, the peel strength gradually increases. The main reason is that the double-sided tape used is 25mm wide. When the pole piece width is 20mm, At 25mm, the peeling process will cause the edge of the 6s 100c lipo battery pole piece to come into contact with the double-sided tape, the contact area between the double-sided tape of the pole piece and the negative electrode coating area becomes smaller, and the bonding strength increases with the increase of the contact area between the adhesive and the surface to be adhered. Increase; when the width of the pole piece of the 6s 100c lipo battery is greater than 25mm, the center of gravity of the pole piece of different widths in the peeling process is different. When the width of the pole piece of the 6s 100c lipo battery is 35mm, the center of gravity of the pole piece reaches the best position, and the test value tends to be stable .
Speaking of influencing factors, the following article introduces the coating defects and influencing factors of lithium battery pole pieces:
1300mah 5s battery pole piece coating defects and influencing factors

(2) The influence of the tensile distance data range on the peel strength of the 6s 100c lipo battery pole piece

The stretch distance data range is important and has a considerable impact on the peel strength of the 6s 100c lipo battery. In order to prevent the abnormal peeling process of the 6s 100c lipo battery pole piece, you can gently peel off the pole piece and the double-sided tape by 1mm before peeling, and then test, the tensile distance data range is still 25 ~ 80mm, and ensure this range. The inner pole piece test curve is stable. If the test curve is still unstable, re-sampling test is required.

When the tensile speed of the 6s 100c lipo battery pole piece is 50-200mm/min, with the increase of the tensile speed, the peel strength first decreases and then becomes stable, but from the stability of the test data, the tensile speed is At 100mm/min, the standard deviation of the test results is the smallest, and at 50mm/min, the stability of the test results is the worst.

This is mainly because when the stretching speed is too slow, the contact time between the double-sided tape and the pole piece is long, the required peel strength is large, and the test curve stability is poor. In summary, considering the data accuracy, time cost and test stability, the tensile speed of the 6s 100c lipo battery pole piece is selected to be 100mm/min.

(3) Influence of rolling times on peel strength of 6s 100c lipo battery pole piece

Within a certain range, the peel strength of the 6s 100c lipo battery pole piece basically does not change with the increase of the number of rolling times, indicating that the number of times the pressure roller rolls on the surface of the pole piece has little effect on the peel strength of the negative pole piece of the 6s 100c lipo battery The main reason is that the large pressure of the negative pole piece after rolling on the roller press has made the active material and the current collector tightly combined. The effect on the top glue does not change the peel strength of the coating.

From the data stability of the test, when the number of rolling times is 3 times, the relative standard deviation is the smallest, only 0.96%, so the number of times that the pressure roller is rolled on the surface of the 6s 100c lipo battery pole piece is selected to be 3 times.
The above is the whole content of the 6s 100c lipo battery pole piece brought to you by CNHL today. After reading the full text in detail, everyone has an understanding of the test method of the 6s 100c lipo battery pole piece peeling strength and its influencing factors. I hope the above content is correct You are helpful, if you want to get more lithium battery information, you can click below:
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