Battery Cap Assembly With Gasket Flange for Shock Resistance
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Solution Overview
Problem
Secondary batteries face issues with vibration and shock, leading to internal malfunctions due to inadequate coupling of electrode terminals and inefficient use of internal space.
Innovation Solution
A secondary battery design featuring a cap assembly with a gasket and fastening plate that enhances the coupling force of electrode terminals and increases internal space efficiency by positioning the fastening components outside the cap plate, thereby improving structural integrity and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electrode terminal is directly coupled to the cap plate, then the coupling force is insufficient, but adding a gasket and fastening plate increases structural complexity
Solution Approach 1:
A gasket is introduced as an intermediary component between the electrode terminal and the cap plate. The gasket includes a pressing portion that contacts the electrode terminal and a flange portion that extends onto the cap plate, providing enhanced coupling force while distributing stress. This mediator resolves the contradiction by strengthening the connection without requiring direct rigid coupling.
Solution Approach 2:
The fastening plate is integrated with the cap plate to form a unified cap assembly structure. The fastening plate includes through-holes for fasteners and combines the sealing function with the structural support function, reducing the number of separate components while maintaining the enhanced coupling force provided by the gasket and fastening plate system.
2Strength
If the gasket and fastening components are positioned inside the cap plate, then the coupling force is improved, but the internal space efficiency decreases
Solution Approach 1:
The gasket's flange portion extends in a direction parallel to the cap plate surface rather than perpendicular to it. This dimensional change allows the coupling components to be positioned outside the vertical profile of the cap plate, maintaining enhanced coupling force while preserving the internal space within the battery case.
3Reliability
If the battery structure is reinforced to resist vibration and shock, then the reliability improves, but the internal space for electrode assembly decreases
Solution Approach 1:
The gasket and fastening plate are pre-positioned and secured to the cap plate before final assembly. The gasket's flange portion is already extending onto the cap plate surface, creating a pre-established coupling system that provides vibration and shock resistance without requiring additional space-d consuming reinforcement structures during operation.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A secondary battery (100) includes: a case (160) having an internal space; an electrode assembly (110) accommodated in the internal space of the case (160); a current collector plate (120) electrically connected to the electrode assembly (110); and a cap assembly (150). The cap assembly (150) includes: a cap plate (151) sealing the case (160); an electrode terminal (154) coupled to the current collector plate (120) and extending through the cap plate (151); and a gasket (153) between the electrode terminal (154) and the cap plate (151). The gasket (153) has a flange portion (153a), and the flange portion (153a) of the gasket (153) is between an upper surface of the cap plate (151) and the electrode terminal (154).