UV-Crosslinked Composite Coatings for Heat-Sensitive Battery Cells
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Solution Overview
Problem
Existing methods for forming crosslinked coatings on heat-sensitive structures like battery cells require high temperatures, leading to potential degradation, and existing radiation-induced coatings suffer from solvent evaporation issues, adhesion problems, and reduced dielectric strength, making them unsuitable for high-voltage applications.
Innovation Solution
A composite material comprising a metal substrate coated with a UV-crosslinkable composition containing (meth)acrylated fluoropolymer, (meth)acrylic monomer or oligomer, and an adhesion promoter, which can be crosslinked at room temperature without solvents, ensuring high adhesion, cohesion, and dielectric strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature crosslinking is used to form a coating, then the coating achieves high adhesion and dielectric strength, but heat-sensitive structures like battery cells suffer degradation
Solution Approach 1:
The patent changes the curing temperature parameter from high-temperature thermal crosslinking to room-temperature UV crosslinking. The coating composition is formulated with photoinitiators that enable crosslinking at low temperatures, thus protecting heat-sensitive battery cells while still achieving high adhesion (≥5 MPa) and dielectric strength (≥3.5 kV) through UV-induced polymerization
Solution Approach 2:
The patent replaces the thermal energy mechanism (heat) with electromagnetic radiation (UV light) to initiate crosslinking. Instead of using thermal energy to activate crosslinking reactions, UV photons activate photoinitiators that generate radicals for crosslinking, thereby avoiding thermal degradation of battery components
2Object-affected harmful factors
If radiation-induced crosslinking is used to avoid high temperatures, then heat-sensitive structures are protected, but the coating suffers from solvent evaporation issues and reduced dielectric strength
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating specific adhesion promoters and dielectric-enhancing additives into the UV-curable coating formulation. These compositional changes compensate for the lower crosslinking density at room temperature, achieving ≥5 MPa adhesion and ≥3.5 kV dielectric strength without requiring high-temperature processing
Solution Approach 2:
The patent creates a composite coating system combining UV-curable resins, adhesion promoters, dielectric additives, and photoinitiators. This multi-component composite formulation synergistically provides both room-temperature processability and high-performance properties (adhesion ≥5 MPa, dielectric strength ≥3.5 kV) that individual components cannot achieve alone
3Reliability
If a coating is applied to pre-assembled battery structures, then the entire structure can be protected, but the coating process requires high temperatures that degrade battery components
Solution Approach 1:
The patent changes the processing temperature parameter from high-temperature thermal curing to room-temperature UV curing. This enables post-assembly coating of complete battery structures without exposing heat-sensitive components to degrading temperatures, while still achieving comprehensive protection with adhesion ≥5 MPa and dielectric strength ≥3.5 kV through UV-induced crosslinking
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a crosslinked coating with adhesion of 5 MPa or greater, dielectric strength of 3.5 kV or greater, and solvent-free processing, suitable for heat-sensitive structures like battery cells, enhancing safety and performance.
Implementation Method 1
a UV-crosslinkable composition for forming a crosslinked coating on the metal substrate by UV irradiation
Data Source
AI summary
The present invention provides Composite material comprising a metal substrate and provided on at least a part of at least one surface of the metal substrate, a UV-crosslinkable composition for forming a crosslinked coating on the metal substrate by UV irradiation, the UV-crosslinkable composition comprising (A) a (meth)acrylated fluoropolymer; (B) a (meth)acrylic monomer or oligomer, preferably having a surface tension of 40 dyne/cm or less and/or a viscosity of 15 cps (at 25°C) or less; (C) optionally, a fluorine-free (meth)acrylic polymer; and (D) optionally, an adhesion promoter; wherein one or more of the components (A), (B), (C) and (D) comprises a group that is capable of being decomposed upon exposure to UV radiation to form radicals, and/or wherein the composition comprises a compound (E) that is capable of being decomposed upon exposure to UV radiation to form radicals.