Battery Cap Assembly With Anti-Rotation Terminal Recesses
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Solution Overview
Problem
Current cap assemblies for secondary batteries have limited radial dimensions due to anti-rotation protrusions, resulting in low overcurrent capacity and stability issues with the electrode terminal.
Innovation Solution
A cap assembly design featuring a cap plate with an electrode lead-out hole, an electrode terminal with recesses on its side wall, and an isolating member with protrusions that prevent rotation, allowing for increased radial dimensions and improved connection stability between the isolating member and the electrode terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-rotation protrusions are provided on the isolating member, then rotation prevention is achieved, but the aperture size is limited and radial dimension is reduced
Solution Approach 1:
The invention extracts the rotation prevention function from the isolating member by providing recesses on the electrode terminal instead. The isolating member no longer needs protrusions, allowing its aperture to be enlarged without rotation prevention structures, thus resolving the contradiction between rotation prevention and aperture size.
Solution Approach 2:
The invention introduces an intermediary structure (recesses on the electrode terminal) to achieve rotation prevention. Instead of using protrusions on the isolating member that constrain the aperture, the recesses on the electrode terminal serve as the intermediary mechanism for preventing rotation while allowing the isolating member aperture to be larger.
2Reliability
If the aperture size is limited by anti-rotation protrusions, then rotation is prevented, but the overcurrent capacity is reduced
Solution Approach 1:
The invention removes the anti-rotation protrusions from the isolating member, extracting the rotation prevention function and relocating it to the electrode terminal structure. This extraction allows the isolating member aperture to be enlarged, thereby improving the overcurrent capacity without sacrificing rotation prevention capability.
3Power
If the radial dimension of the extension portion is increased, then the overcurrent capacity is improved, but the connection stability may be compromised
Solution Approach 1:
The invention uses a simple recess structure on the electrode terminal that is easy to manufacture and integrate. This simple structural modification allows the extension portion to have a larger radial dimension for improved overcurrent capacity while the recesses provide sufficient connection stability through their geometric constraint.
Data Source
AI summary
The present disclosure relates to a cap assembly and a secondary battery. The cap assembly includes a cap plate provided with an electrode lead-out hole; an electrode terminal, covering the electrode lead-out hole and including a main body, wherein the main body is provided with a recess on a side wall; an isolating member including a receiving portion, wherein the main body is received in the receiving portion; and a protrusion, connected to an inner wall of the isolating member and extending towards an axis of the electrode lead-out hole, wherein the protrusion is received in the recess so as to prevent the main body from rotating relative to the isolating member. The cap assembly according to the embodiments of the present application can improve an overcurrent capacity and stability of the electrode terminal.