Method for packaging a battery device

By packaging the battery unit with an aqueous two-component polyurethane composition, the problems of insufficient electrical insulation and poor mechanical properties are solved, efficient electrical insulation and mechanical properties are achieved, and the safety manufacturing requirements of the battery industry are met.

CN116323185BActive Publication Date: 2025-04-01DOW GLOBAL TECHNOLOGIES LLC +1
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Patent Information

Application Number
CN202080104645.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-07-30
Publication Date
2025-04-01
Estimated Expiration
2040-07-30

AI Technical Summary

Technical Problem

The prior art has problems such as insufficient electrical insulation, poor mechanical properties, poor wear resistance characteristics, and failure to fully meet safety manufacturing requirements when packaging battery units.

Method used

Packaging is carried out using a specific aqueous two-component polyurethane composition containing an aqueous dispersion containing a hydroxy functional polymer and a polyisocyanate and forming a filler layer by drying.

Benefits of technology

Good electrical insulation at film thickness of 30 μm to 120 μm is achieved while providing balanced mechanical properties such as high volume resistivity, impact resistance and chemical resistance without the need for the use of adhesive materials.

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Abstract

The present invention discloses a method for packaging a battery device with a metal shell, which comprises: applying an aqueous two-component polyurethane composition to the metal shell of the battery device, and drying the applied polyurethane composition to form a packaging layer; wherein the polyurethane composition comprises (A) an aqueous dispersion comprising a hydroxyl-functional polymer, wherein the hydroxyl-functional polymer comprises 20% to 50% of structural units of hydroxyl-functional (meth) alkyl acrylates, 0.1% to 10% of structural units of acid monomers, salts thereof or mixtures thereof, and structural units of monoethylenically unsaturated nonionic monomers, based on the weight of the hydroxyl-functional polymer.
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