Battery Encapsulation Casing Bonded Sealing Cover
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Solution Overview
Problem
The existing encapsulation methods for pouch lithium-ion batteries, which involve heat-sealing and folding of aluminum-plastic membranes, result in increased volume, decreased energy density, and the formation of sharp corners and seal edges, limiting the battery's efficiency and space utilization.
Innovation Solution
A battery design that incorporates an encapsulation casing with a sealing cover bonded to its end, eliminating the need for heat-sealing and folding, thereby reducing the battery's volume and enhancing energy density by eliminating seal edges and sharp corners, and using a hollow columnar structure for the encapsulation casing to simplify manufacturing and prevent heat-seal edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat-sealing and folding of aluminum-plastic membrane is used for encapsulation, then sealing is achieved, but volume increases and energy density decreases
Solution Approach 1:
The patent extracts and eliminates the heat-sealing and folding processes from the encapsulation method. Instead of using aluminum-plastic membrane that requires heat-sealing, the invention uses a different encapsulation approach that does not require these processes, thereby removing the source of volume increase and sharp corner formation.
Solution Approach 2:
The patent inverts the conventional encapsulation approach by avoiding heat-sealing and folding altogether. Rather than sealing edges through thermal processes that create sharp corners, the invention uses an alternative method that inherently avoids these geometric features, thus reducing volume while maintaining sealing.
2Reliability
If heat-sealing is performed on aluminum-plastic membrane, then sealing is formed, but sharp corners and seal edges are created increasing occupied space
Solution Approach 1:
The patent removes the heat-sealing process from the encapsulation methodology. By extracting this thermal processing step, the invention eliminates the formation of sharp corners and seal edges that inherently result from heat-sealing aluminum-plastic membrane, thus improving the geometric efficiency of the battery package.
3Ease of manufacture
If aluminum-plastic membrane encapsulation is used, then battery assembly is achieved, but volumetric energy density decreases
Solution Approach 1:
The patent extracts the aluminum-plastic membrane material system from the encapsulation process and replaces it with an alternative approach. This elimination of the traditional membrane-based encapsulation removes the volume-consuming seal edges and folding structures, thereby increasing the active volume available for energy storage and improving volumetric energy density.
Data Source
AI summary
The present disclosure relates to a battery. The battery includes an encapsulation casing, a battery cell and a sealing cover. The encapsulation casing has an opening in an end thereof. The battery cell is arranged in the encapsulation casing. The sealing cover is bonded with the end of the encapsulation casing to seal the opening.