Power Battery Top Cap Insulation Abutment Member
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Solution Overview
Problem
Lithium ion batteries face challenges in maintaining effective insulation between electrodes, leading to potential short circuits due to vertical displacement of the lower insulation member during battery shaking, which compromises the safety and efficiency of electric vehicle batteries.
Innovation Solution
A power battery top cap structure that includes a lower insulation member fixed by a snap fit with an abutment member extending along the Y axis, increasing the distance between the connecting portion and the top cap piece, preventing vertical displacement and ensuring a secure snap fitting, thereby preventing direct contact between the battery core and the top cap piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower insulation member is fixed by snap fit below the top cap piece, then the insulation function is provided, but the lower insulation member may vertically displace during battery shaking causing short circuit
Solution Approach 1:
The abutment member serves as an intermediary component between the connecting portion and the top cap piece. It prevents vertical displacement of the lower insulation member by abutting against the top cap piece, while allowing the snap fit connection to remain intact. This mediator resolves the contradiction by providing stability without compromising the insulation function.
Solution Approach 2:
The abutment member extends along the Y axis (lateral direction) rather than only in the Z axis (vertical direction). By introducing a lateral extension dimension, the abutment member can effectively prevent vertical displacement through its abutting surface, transforming the constraint mechanism from purely vertical to multi-dimensional.
2Stability of the object's composition
If the distance between the connecting portion and the top cap piece is increased to prevent displacement, then stability is improved, but the space utilization and energy density are reduced
Solution Approach 1:
The abutment member extends along the Y axis (lateral direction) with a natural size of 0.5mm to 30mm, rather than increasing the Z axis distance. By utilizing the lateral dimension for the abutment function, the vertical space (G3) is minimized while still achieving effective displacement prevention. This dimensional strategy resolves the contradiction between stability and space utilization.
Data Source
AI summary
A power battery and a power battery top cap structure for a power battery are provided. The power battery top cap structure includes first and second electrode assemblies, a lower insulation member, a top cap piece, and an abutment member. Both the first and second electrode assemblies are fixed on the top cap piece. The lower insulation member is fixed below the top cap piece. The lower insulation member includes, along an X axis, a snapping portion and a connecting portion. The abutment member extends along a Y axis and abuts between the connecting portion and the top cap piece so that a minimum distance between the connecting portion and the top cap piece along the Z axis is G3, where G3>0. G3 may be greater than a minimum distance between the connecting portion and the top cap piece when the lower insulation member is fixed without the abutment member.