Battery Terminal Layout With Insulating Plate for Heat and Isolation
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Solution Overview
Problem
Existing secondary battery designs face limitations in increasing the cross-sectional area of terminals while maintaining insulation and design flexibility, as the tabs need to be thickened to suppress heat generation, restricting the degree of freedom in terminal design.
Innovation Solution
The secondary battery incorporates flat plate-shaped positive and negative electrode terminals with an insulating plate between them, allowing for adjustable cross-sectional area and improved insulation, along with a holder and fixing portions to secure the terminals and laminate exterior body, enhancing design flexibility and weldability.
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 patent achieves larger cross-sectional area for heat dissipation while maintaining design flexibility and proper insulation between tabs.
2Temperature
If the cross sectional area of each tab is increased to suppress heat generation, then heat generation is suppressed, but insulation between tabs becomes more difficult to secure
Solution Approach 1:
Instead of increasing tab thickness which reduces insulation space, the patent increases tab width in the planar direction. This dimensional change allows for larger cross-sectional area for heat suppression while maintaining adequate insulation distance between tabs in the thickness direction of the laminate film exterior body.
3Reliability
If the tabs are arranged to be aligned in the direction orthogonal to the thickness direction, then insulation can be maintained, but the cross sectional area is limited and design flexibility is reduced
Solution Approach 1:
The patent maintains the orthogonal arrangement of tabs for insulation but increases the cross-sectional area by extending the width of tabs in the planar direction rather than increasing thickness. This allows for greater design flexibility in terminal configuration while preserving the insulating arrangement.
Data Source
AI summary
A secondary battery includes an electrode, a positive electrode current collector, a negative electrode current collector, a positive electrode terminal, a negative electrode terminal, and an insulating plate. The positive electrode terminal and the negative electrode terminal each have a main side surface and a sub side surface having an area smaller than that of the main side surface. The positive electrode terminal and the negative electrode terminal are arranged so that the main side surface of the positive electrode terminal and the main side surface of the negative electrode terminal face each other. The insulating plate is arranged between the main side surface of the positive electrode terminal and the main side surface of the negative electrode terminal.