Electrode Terminal Sealing Structure Against Vibration Detachment
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Solution Overview
Problem
Vibrations in moving bodies cause stress on electrode terminals of electric storage devices, leading to potential breakage of the sealing material and detachment of the electrode terminal, especially when lifted in a direction that can detach the terminal.
Innovation Solution
The electric storage device incorporates a sealing material integrated with the case and electrode terminal, featuring a base part covering the back surface, a side surface protecting part, and a locking part covering the connection surface to prevent the electrode terminal from rising and detaching, while ensuring proper connection with external conductive parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing material is used to seal the penetration hole, then the electrode terminal can be electrically connected to the outside, but the sealing material may breakage or detach when large stress is applied during vibration
Solution Approach 1:
The sealing material is formed as a composite structure integrating multiple functional parts: a base part for sealing, a side surface protecting part for mechanical protection, and a locking part for fixation. This composite design combines different functional properties in a single integrated component, enhancing overall reliability without requiring separate elements.
Solution Approach 2:
The sealing material is divided into distinct functional segments: the base part that seals the penetration hole, the side surface protecting part that covers and protects the electrode terminal's side surface, and the locking part that prevents detachment. This segmentation allows each part to optimize its specific function while working together as a unified structure.
2Reliability
If the sealing material is made more robust to prevent breakage, then the connection stability improves, but the device complexity increases
Solution Approach 1:
Multiple protective and sealing functions are merged into a single integrated sealing material component. The base part, side surface protecting part, and locking part are formed as one unified resin member, eliminating the need for separate sealing elements and reducing assembly complexity while maintaining enhanced durability.
Solution Approach 2:
The sealing material serves multiple functions simultaneously: it seals the penetration hole electrically and mechanically, protects the electrode terminal's side surface from stress, and provides locking engagement to prevent detachment. This multi-functionality reduces the need for additional separate components.
3Strength
If the locking part covers the entire connection surface, then the electrode terminal is firmly fixed, but the connection with external conductive parts is hindered
Solution Approach 1:
The locking part is designed to cover only specific local areas of the connection surface, particularly the peripheral edge part, rather than the entire surface. This localized coverage provides sufficient fixation strength at critical stress points while leaving the central connection area exposed for electrical connection with external conductive parts.
Solution Approach 2:
Instead of covering the entire connection surface, the locking part applies fixation action only to the necessary peripheral regions. This partial action is sufficient to prevent detachment and regulate rise of the electrode terminal, while maintaining accessibility of the central connection surface for external connections.
Data Source
AI summary
A case of the herein disclosed electric storage device includes an electrode terminal, and a sealing material. The electrode terminal includes a shaft part and a plate part. Then, the sealing material includes a side surface protecting part configured to cover the side surface of the plate part, and a locking part configured to continue to a top end of the side surface protecting part and configured to cover a peripheral edge part of the connection surface. According to the electric storage device including the above described configuration, it is possible by the locking part of the sealing material to regulate a rise of the electrode terminal, and thus it is possible to inhibit a breakage of the sealing material and a detachment of the electrode terminal.