Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for testing peel strength of battery pole piece

A test method and peel strength technology, which is applied in the field of peel strength testing of battery pole pieces, can solve problems such as inaccurate peel strength test results, and achieve the effect of precise peel strength

Pending Publication Date: 2022-07-22
湖州卫蓝科技有限公司
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In an ideal state, when the peeling speed is constant, the peeling force should be constant, that is to say, the peeling force reflected on the peeling curve is a horizontal straight line, but the actual peeling force is affected by various environments and conditions is fluctuating, which makes the peel strength test results inaccurate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for testing peel strength of battery pole piece
  • Method for testing peel strength of battery pole piece
  • Method for testing peel strength of battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 (the present invention)

[0037] 1.1 Preparation of double-sided coated pole pieces

[0038] The positive electrode sheet of the battery includes the following materials: the main material ternary nickel cobalt lithium manganate (NCM), a conductive agent, and polyvinylidene fluoride, and the mass ratio thereof is 95:3:2. Mix the materials together according to the above proportions, disperse the mixed materials in the solvent N-methylpyrrolidone into a slurry, apply the slurry to both surfaces of the aluminum foil as the dressing layer of the positive electrode sheet of the battery, and coat the The aluminum foil of the slurry is dried to form a positive electrode sheet of the battery, and the thickness of the coating on both sides is 260um.

[0039] 1.2 Obtain the pole piece to be tested: Take about 50mm*15cm double-sided tape and attach it to the surface of the smooth roller; take the above double-sided pole piece and place it on a flat and pollution-free tab...

Embodiment 2

[0041] Example 2 (the present invention)

[0042] 2.1 Preparation of single-sided coated pole pieces

[0043] The positive electrode sheet of the battery includes the following materials: the main material ternary nickel cobalt lithium manganate (NCM), a conductive agent, and polyvinylidene fluoride, and the mass ratio thereof is 95:3:2. Mix the materials together according to the above proportions, disperse the mixed materials in the solvent N-methylpyrrolidone into a slurry, apply the slurry to one surface of the aluminum foil as the dressing layer of the positive electrode sheet of the battery, and coat the slurry with the slurry. The aluminum foil of the material is dried to form a positive electrode sheet of the battery, and the thickness of the coating to be tested is 260um.

[0044] 2.2 Peeling test: use the sample cutting equipment to cut the sample in the flat area that has been peeled off; paste the double-sided tape on the surface of the flat and smooth steel plate...

Embodiment 3

[0045] Example 3 (the present invention)

[0046] Double-sided coated pole pieces were prepared and tested in the same manner as in Example 1, except that step 1.2 was replaced with step 3.2:

[0047] 3.2 Obtaining the pole piece to be tested: Take the double-sided pole piece and place it on a flat and pollution-free table with the coating on the surface to be measured underneath; press and fix the lower end of the pole piece on the tabletop, and the pole piece cannot be broken; dip the NMP solution with a cotton swab, use a cotton swab Wipe the back coating repeatedly to make the back coating fall off completely, and the thickness of the coating to be tested is 260um.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The embodiment of the invention provides a method for testing the peel strength of a battery pole piece, and the method comprises the following steps: obtaining a to-be-tested pole piece, the to-be-tested pole piece comprises a current collector and a to-be-tested coating located on one surface of the current collector, and the other surface of the current collector is not provided with a coating; performing a stripping test on the to-be-tested coating of the to-be-tested pole piece to obtain test data; and determining the peel strength according to the test data. According to the test method, the pole piece is not provided with a back coating, and more accurate peel strength can be obtained by performing a peel test on the coating of the to-be-tested surface of the pole piece.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for testing the peeling strength of battery pole pieces. Background technique [0002] The positive and negative electrode sheets in the battery are composed of a current collector and a coating applied on both sides of the current collector, and the materials of the coating include a main material and a binder. During R&D and production, the pole pieces are tested for peel strength to check the adhesion properties of the coating and pole piece stability. [0003] Existing pole piece peel strength test methods generally include the following: 180° peel strength test, 90° or other angle peel strength test. Among them, 180°, 90° and other angles are the peeling angles exhibited during peeling. Under ideal conditions, the peeling force should be constant when the peeling speed is constant, that is to say, the peeling force reflected on the peeling conformity curve is a horizontal...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 栗波陈光海王艳娜杨晨旭张冠中俞会根
Owner 湖州卫蓝科技有限公司