Battery Insulation Sheath Structure for Cell-to-Housing Corrosion Isolation
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Solution Overview
Problem
Existing lithium battery coatings fail to effectively isolate the cell package from the aluminum housing, leading to electrochemical corrosion.
Innovation Solution
A cell insulation protective sheath with insulating portions and connecting portions that form an accommodating cavity for the cell, featuring folding portions to prevent electrochemical substances from overflowing and corroding the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film coating method is used to isolate the cell package from the aluminum housing, then the isolation effect is improved, but the reliability is worsened due to electrochemical corrosion occurring through gaps in the coating
Solution Approach 1:
The patent uses a film-based protective sheath that completely wraps around the cell package, providing flexible yet effective isolation. The sheath material forms a continuous barrier that prevents electrochemical substances from contacting the aluminum housing, resolving the corrosion issue while maintaining isolation effectiveness.
Solution Approach 2:
The protective sheath is constructed from composite materials that combine multiple functional properties - electrical insulation, chemical resistance, and mechanical protection. This composite structure ensures reliable isolation while preventing electrochemical corrosion through the use of corrosion-resistant material layers.
2Object-affected harmful factors
If the cell package is completely isolated from the housing, then corrosion prevention is improved, but the device complexity increases due to additional protective structures
Solution Approach 1:
The protective sheath combines multiple protective functions into a single integrated component - electrical insulation, chemical corrosion protection, and mechanical protection are all provided by one structure rather than separate components, reducing overall device complexity while maintaining effective isolation.
Solution Approach 2:
The protective sheath serves multiple functions simultaneously: it acts as an electrical insulator, a chemical barrier against electrochemical substances, and a mechanical protective layer. This multi-functionality eliminates the need for separate protective components, simplifying the overall battery structure.
Data Source
AI summary
The present disclosure provides a cell insulation protective sheath, which includes a first insulating portion and a second insulatiing portion that are disposed opposite to each other, a first connecting portion and a second connecting portion that are disposed opposite to each other, a third insulating portion, and two folding portions. The first insulating portion, the second insulating portion, the third insulating portion, the first connecting portion, and the second connecting portion enclose to form an accommodating cavity. The two folding portions are integrally connected to the third insulating portion.