Secondary Cell Cover Protrusion Insulation
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Solution Overview
Problem
In secondary battery systems, increasing the number of modules connected while maintaining insulation resistance is challenging due to the limitations of existing insulation methods, which often lead to increased container size and mica sheet cracking.
Innovation Solution
The design incorporates a cover member with a protrusion on its expansion surface, reducing the contact area with insulating plates and distributing stress, thereby enhancing insulation resistance without increasing the number or thickness of insulating sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of flat plates of ceramic or mica is increased between the battery assembly and the container, then the insulation resistance is improved, but the height of the container is increased
Solution Approach 1:
The invention applies local quality by creating an uneven surface on the insulating plate with protrusions and recesses. This local variation in surface topology reduces the contact area between the insulating plate and battery assembly, thereby improving insulation resistance without requiring additional plates or increased container height.
2Reliability
If the thickness of flat plates of ceramic or mica is increased, then the insulation resistance is improved, but cracks tend to occur easily in the mica during operation
Solution Approach 1:
By creating local variations in the insulating plate surface with protrusions and recesses, the invention reduces the overall contact area and stress concentration on the mica material. This prevents crack formation while maintaining adequate insulation resistance, eliminating the need to increase plate thickness.
3Stability of the object's composition
If the contact area between the insulating plate and battery assembly is increased, then the mechanical stability is improved, but the insulation resistance is reduced
Solution Approach 1:
The invention resolves this contradiction by creating local quality variations on the insulating plate surface. The protrusions and recesses ensure that contact occurs at specific localized points rather than across the entire surface, maintaining mechanical stability through point contacts while preserving insulation resistance by minimizing overall contact area.
4Power
If the number of modules connected to the secondary battery system is increased, then the electric power is improved, but the insulation resistance between the system and ground is reduced
Solution Approach 1:
By implementing local quality variations on each module's insulating plate, the invention ensures that each module maintains high insulation resistance independently. This allows multiple modules to be connected in parallel to increase electric power while each module's reduced contact area prevents insulation resistance degradation of the overall system.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The present invention pertains to a secondary cell. This secondary cell has a cell main unit (48) of cylindrical shape, and a cover member (50) housing the cell main unit (48). The cover member (50) has a cylindrical body (56) covering at least the side surface of the cell main unit (48), and a bottom part (58) covering at least a portion of the bottom surface (48b) of the cell main unit (48). The bottom part (58) has a jutting portion (62) which juts in a direction away from the bottom surface (48b) of the cell main unit (48), and which contacts at the end surface thereof an insulating plate (68). The surface area of the end surface of the jutting portion (62) is smaller than the surface area of the bottom surface (48b) of the cell main unit (48).