Method for representing cohesive force between diaphragm and pole piece of lithium battery coated with polymer

A lithium battery diaphragm and polymer technology, applied in the direction of measuring devices, instruments, and mechanical devices, can solve the problems of inability to measure the size of the bonding force, poor bonding performance, and no bonding under force, and achieve detection work High efficiency, good detection repeatability, and wide application range
CN106769845AInactive Publication Date: 2017-05-31SHENZHEN SENIOR TECH MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN SENIOR TECH MATERIAL
Publication Date
2017-05-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for representing a cohesive force between a diaphragm and a pole piece of a lithium battery coated with polymer. The method comprises the following steps: firstly, overlapping the diaphragm coated with a coating layer with the pole piece; adopting a roller press for hotly gluing the diagram with the pole piece, wherein one side coated with the coating layer is faced to the pole piece; cutting a sample for the adhered diaphragm and pole piece coated with the polymer, thereby obtaining a bar-shaped sample; using a universal tensile testing machine for stripping the bar-shaped sample and recording a force value at a stripping moment; calculating the bonding strength between the diaphragm and pole piece coated with the polymer. The method disclosed by the invention has the advantages of being simple and convenient in operation, simple in equipment, high in detecting repeatability and high in working efficiency; the bonding strength value after hot pressing between the diaphragm and the pole piece of the lithium battery coated with polymer can be accurately and conveniently obtained; the method is suitable for the detection process for the bonding strength value after hot pressing between the diaphragm and the pole piece of the lithium battery coated with polymer in different sizes; the application scope is wide.
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Description

technical field

[0001] The invention belongs to the technical field of material testing, and in particular relates to a method for characterizing the thermocompression bonding force between polymer-coated lithium-ion battery separators and pole pieces. Background technique

[0002] With the development of the lithium-ion battery industry, the hardness requirements for lithium-ion batteries are getting higher and higher, and polymer-coated separators have also emerged as the times require. The polymer-coated diaphragm is based on a porous polyolefin diaphragm, and the surface is coated with a layer of organic material, which is bonded to the substrate through a special process. Because of the characteristics of the organic compound itself, it is coated with it The high-quality separator can be bonded to the battery pole piece under high temperature and high pressure, thereby improving the hardness of the battery and protecting the battery cell. Therefore, the bond strength be...

Claims

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