Box-Shaped Battery Enclosure for Moisture Barrier and Sealing Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional batteries using laminate films for exterior bodies face issues with moisture permeation resistance and structural efficiency, requiring large heat-welded sealing areas and exposing terminals, which deteriorates manufacturing efficiency and structural integrity.
Innovation Solution
A battery design featuring a metal exterior body pair with box-shaped positive and negative electrode metal exterior bodies, insulated by resins, which eliminates the need for heat-welded seals and allows for improved moisture permeation resistance and structural efficiency by using different resins for insulating and moisture barrier functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminate film is used as the exterior body to ensure moisture permeation resistance, then water vapor barrier performance is improved, but the surface area of heat-welded sealing regions must be made large which deteriorates structural efficiency
Solution Approach 1:
The exterior body is divided into a metal exterior body and a laminate film exterior body. The metal exterior body provides mechanical strength and houses the electrode assembly, while the laminate film is applied only to side surfaces requiring moisture barrier protection. This segmentation allows each component to perform its specialized function without compromising overall structural efficiency.
Solution Approach 2:
The laminate film is selectively applied only to specific regions (side surfaces) where moisture barrier protection is most critical, rather than covering the entire exterior body. This local application reduces the total heat-welded sealing area while maintaining moisture permeation resistance where needed.
2Reliability
If a laminate film is used as the exterior body to ensure moisture permeation resistance, then water vapor barrier performance is improved, but the manufacturing efficiency deteriorates due to large heat-welded sealing areas
Solution Approach 1:
The exterior body is divided into a metal exterior body and a laminate film exterior body. The metal exterior body provides mechanical strength and houses the electrode assembly, while the laminate film is applied only to side surfaces requiring moisture barrier protection. This segmentation allows each component to perform its specialized function without compromising overall structural efficiency.
Solution Approach 2:
The laminate film is selectively applied only to specific regions (side surfaces) where moisture barrier protection is most critical, rather than covering the entire exterior body. This local application reduces the total heat-welded sealing area while maintaining moisture permeation resistance where needed.
3Ease of operation
If terminals are exposed to the exterior of the laminate film for external connection, then electrical connection is enabled, but the structural efficiency deteriorates
Solution Approach 1:
The metal exterior body serves multiple functions: it provides mechanical strength, acts as a moisture barrier, and serves as the terminal for electrical connection. By integrating the terminal function into the metal exterior body structure, the need for separate terminal components is eliminated, improving structural efficiency while maintaining ease of electrical connection.
Data Source
AI summary
A battery has: an electrode body; positive and negative electrode foils provided at surfaces of the electrode body; a metal exterior body pair formed from a positive electrode metal exterior body that contacts the positive electrode foil and a negative electrode metal exterior body that contacts the negative electrode foil; and resins that fix the electrode body and metal exterior body pair. Outer surfaces of the metal exterior body pair are exposed to enable electrical connection with an exterior. At least one of the positive or negative electrode metal exterior bodies is shaped as a box having a bottom plate that is quadrilateral and four side plates that each share one side with the bottom plate, and accommodates the electrode body at an inner side of the box shape. The positive and negative electrode metal exterior bodies and side surfaces of the electrode body are respectively insulated by the resins.