Pouch Battery Terminal Layout for Insulation and Lower Heat
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Solution Overview
Problem
Existing secondary batteries face limitations in securing insulation between terminals while maintaining design freedom and preventing heat generation, particularly when increasing the cross-sectional area of the tabs.
Innovation Solution
A secondary battery design featuring flat plate-shaped terminals with an insulating plate between them, allowing adjustment of the main side surface area to ensure insulation and enhance design freedom, while also incorporating a holder and laminate exterior body for structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the thickness of each tab is increased to increase the cross sectional area and suppress heat generation, then heat generation is suppressed, but the degree of freedom of design is reduced and insulation requirements increase
Solution Approach 1:
The patent transitions from increasing tab thickness (one dimension) to increasing tab width (another dimension) to achieve the same heat suppression effect. By arranging tabs with their width extending in the plane of the laminate film exterior body rather than increasing thickness, the design maintains insulation clearance while achieving adequate cross-sectional area for heat management.
Solution Approach 2:
The patent applies different dimensional increases to different parts of the tab structure. Instead of uniformly increasing thickness throughout, the width is increased locally in the plane of the film, allowing optimized heat dissipation while maintaining appropriate insulation distances from other battery components.
2Temperature
If the cross sectional area of each tab is increased to suppress heat generation, then heat generation is suppressed, but insulation requirements between tabs increase
Solution Approach 1:
The patent resolves the insulation conflict by increasing tab width in the lateral direction rather than thickness in the vertical direction. This dimensional change allows the tab cross-sectional area to increase for heat suppression while maintaining adequate lateral clearance from other tabs and battery components for insulation.
3Reliability
If the tab thickness is increased to secure insulation, then insulation is improved, but design freedom is reduced
Solution Approach 1:
The patent achieves insulation through lateral spacing of widened tabs in the plane of the laminate film rather than through increased thickness. This approach provides design freedom in selecting tab dimensions and arrangements while securing adequate insulation distances between positive and negative electrode tabs.
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, a single positive electrode terminal formed in a flat plate shape, a single negative electrode terminal formed in a flat plate shape, a holder holding the single positive and negative electrode terminals, and a laminate exterior body. The single positive and negative electrode terminals each have a single protruding portion protruding from the laminate exterior body in one direction. An insulating plate is arranged between main side surfaces of the single protruding portions of the terminals. On one side of the insulating plate in a facing direction, only the single protruding portion of the positive terminal protrudes from the laminate exterior body, and on the other side of the insulating plate in the facing direction, only the single protruding portion of the negative terminal protrudes from the laminate exterior body.