Secondary Battery Cap Assembly Inversion for Energy Density
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Solution Overview
Problem
Conventional cap assemblies for secondary batteries are inefficient in space utilization and reliability due to the use of multiple mechanical components, leading to reduced energy density and potential air or liquid leakage caused by cap plate deformation under internal gas pressure.
Innovation Solution
A cap assembly design featuring a cap plate with an electrode lead-out hole, a fixing member, and a reinforcing portion, where the terminal board is fixed to the fixing member on the side of the cap plate, reducing the need for a base portion inside the case, and incorporating undercut structures and recesses to secure the fixing member, ensuring tight sealing and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal base portion is located inside the case and fixed with mechanical components, then the terminal can be securely fixed to the cap plate, but the internal space occupancy increases and energy density decreases
Solution Approach 1:
The patent inverts the conventional design by moving the terminal base portion from inside the case to outside the case. The terminal now passes through the cap plate with the base portion externally positioned, eliminating the need for internal space occupation while maintaining secure fixation through the cap plate's through-hole structure and sealing member arrangement.
Solution Approach 2:
The patent extracts the terminal base portion from the internal case space and positions it externally. This extraction eliminates the space conflict inside the case, allowing the base portion to be fixed to the cap plate from the external side, thereby reducing internal space occupancy while maintaining fixing reliability through alternative fixation structures.
2Reliability
If multiple mechanical components are used to fix the terminal, then the terminal can be securely mounted, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple functions into integrated components. The cap plate structure combines the terminal fixation function, sealing function, and structural support function into a single integrated element. The sealing member simultaneously provides both sealing and additional fixation, reducing the need for separate mechanical components while maintaining mounting security.
Solution Approach 2:
The cap plate is designed as a multi-functional component that simultaneously performs terminal fixation, sealing, and structural support functions. This universal component eliminates the need for multiple specialized mechanical parts, reducing device complexity and manufacturing cost while maintaining reliable terminal mounting through its integrated through-hole and sealing member structure.
Data Source
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AI summary
The present disclosure provides a cap assembly (100, 101, 102) for a secondary battery and a secondary battery. The cap assembly (100, 101, 102) for the secondary battery includes a cap plate (10), a fixing member (22), a connecting member, an electrode terminal and a reinforcing portion, wherein the cap plate (10) has an electrode lead-out hole (11); the fixing member (22) is fixed to the cap plate (10) through the connecting member; the electrode terminal comprises a terminal board (21), wherein the terminal board (21) has an outer peripheral surface at least partially surrounded by the fixing member (22) so that the electrode terminal is fixed to the fixing member (22), and the terminal board (21) is provided on a side of the cap plate (10) and covers the electrode lead-out hole (11); and the reinforcing portion is fixed to the cap plate (10), and extends along a width direction of the cap plate (10). It is possible to reduce the occupancy of the cap assembly (100, 101, 102) to the internal space of the secondary battery and thus improve the energy density of the secondary battery. It is also possible to solve the problem of air leakage or liquid leakage of the secondary battery that may occur when the cap plate (10) is deformed due to a large amount of gas generated inside the case of the secondary battery.