Laminated Battery Package Structure for Gap-Free Joined Portions
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Solution Overview
Problem
The change in package shape from hexagonal to quadrilateral creates gaps at the joined portions of laminate sheets, reducing structural reliability and efficiency.
Innovation Solution
A battery design with a hexahedral battery element sealed in a package, using a laminate sheet covering four faces and side face members with protrusions at the joined portions to prevent gaps, which also serve as external terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the package shape is changed from hexagonal to quadrilateral to improve structural efficiency, then volume utilization is improved, but gaps are generated at the joined portions of laminate sheets reducing structural reliability
Solution Approach 1:
The side face members are provided with protrusions at specific locations corresponding to the joined portions of the laminate sheet end parts. These protrusions locally fill the triangular gaps that form at the joined portions, addressing the reliability issue at critical locations without changing the overall quadrilateral package shape that provides good volume utilization.
2Shape
If the package shape is changed from hexagonal to quadrilateral to improve structural efficiency, then volume utilization is improved, but gaps are generated at the joined portions reducing structural reliability
Solution Approach 1:
The side face members incorporate protrusions at specific locations that correspond to the joined portions of the laminate sheet. These protrusions locally address the gap formation issue at the joined portions while maintaining the overall quadrilateral shape of the package, thus preserving both the improved volume utilization and structural efficiency.
3Reliability
If protrusions are added to side face members to fill gaps at joined portions, then structural reliability is improved, but device complexity increases
Solution Approach 1:
The protrusions are integrated as part of the side face members, combining the sealing function of the laminate sheet with the gap-filling function of the protrusions in a unified structure. This merging approach improves structural reliability without significantly increasing device complexity, as the protrusions are formed as integral parts of the side face members rather than separate components.
Solution Approach 2:
The side face members serve multiple functions: they provide structural support, seal the battery element, and through their protrusions, fill the gaps at the joined portions of the laminate sheet. This multi-functionality improves structural reliability while avoiding the need for additional separate components, thus not increasing device complexity.
Data Source
AI summary
To provide a battery that can prevent a gap from being generated at a joined portion to prevent structural reliability from being reduced, the battery includes: a battery element that is a hexahedron as a whole; and a package including a laminate sheet and side face members, the battery element being sealed in the package, the laminate sheet covering four faces of the hexahedron of the battery element, having at least one joined portion of end parts thereof to form a tube, the side face members facing other two faces of the hexahedron of the battery element, and being arranged to cover openings of the tube of the laminate sheet, wherein each of the side face members is a hexahedron as a whole, and has a protrusion at a portion thereof which is located at the joined portion of the laminate sheet.