Battery Case Coating for Rust Prevention at Trimming End
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Solution Overview
Problem
Rechargeable batteries face issues with rusting and short circuits at the opening side of the case due to worn-out trimming sections and foreign metal substances, which compromise sealing performance and antirust effects.
Innovation Solution
A rechargeable battery design featuring a coating layer of epoxy resin with a thickness of 5 to 8 μm on the inner surface of the gap at the trimming end, which also extends to the outer surface, improving sealing and preventing rust and short circuits by maintaining adhesive strength and antirust effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antirust processing is performed on the opening side of the case, then rust prevention is improved, but the trimming cross-section becomes worn out and loses the antirust effect
Solution Approach 1:
The patent applies a coating layer to the trimming end and gap inner surface before assembly, performing the protective action in advance. This preliminary coating prevents rust on the trimming cross-section that would otherwise be worn during the beading process, maintaining the antirust effect throughout the product lifecycle.
Solution Approach 2:
The coating layer is selectively applied only to the trimming end and the inner surface of the gap where rust prevention is most critical. This localized treatment targets the specific areas prone to rust and wear without unnecessarily coating the entire case, optimizing both protection and resource usage.
2Reliability
If the opening side of the case is sealed with a gasket, then sealing performance is improved, but foreign metal substances can still cause short circuits
Solution Approach 1:
The coating layer acts as an intermediary barrier between the case and the gasket, and also between the case and any foreign metal substances. This intermediate protective layer prevents direct contact that could lead to short circuits, while still allowing the gasket to maintain its sealing function against the case.
Solution Approach 2:
The patent uses a composite structure combining the case material, the coating layer (epoxy resin or similar), and the gasket material. This multi-material approach provides both sealing functionality and electrical insulation, preventing short circuits while maintaining effective sealing performance.
3Reliability
If a coating layer is applied to prevent rust and short circuits, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The coating is applied during the molding process or as a separate preliminary step before assembly operations. By performing the coating operation early in the manufacturing sequence, the patent integrates protection into the base manufacturing flow rather than adding complex post-assembly processes.
Solution Approach 2:
The patent specifies optimal coating thickness parameters (5 to 8 μm) that provide sufficient protection while minimizing material usage and processing time. By optimizing these parameters, the manufacturing process achieves reliable protection without excessive complexity or cost.
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 coating layer effectively prevents rust and short circuits at the opening side of the battery case, enhancing sealing performance and maintaining long-term antirust and adhesive strength, while reducing the risk of foreign metal substances causing issues.
Implementation Method 1
a coating layer on an inner surface of the gap
Implementation Method 2
maintaining long-term antirust and adhesive strength
Data Source
AI summary
A rechargeable battery capable of preventing rust generation at an opening side of a battery case. The rechargeable battery according to embodiments of the present invention includes: an electrode assembly; a case having an opening and accommodating the electrode assembly; and a cap assembly electrically connected to the electrode assembly, and coupled to an opening side of the case with a gasket interposed therebetween, wherein the opening side of the case includes a trimming end, a gap proximate the trimming end, and a coating layer on an inner surface of the gap proximate the trimming end.