Energy Storage Plug Sealing via Orthogonal Projection
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Solution Overview
Problem
Conventional energy storage devices experience bonding failures between the electrolyte solution plug and the case due to electrolyte solution leakage through the plug, which is press-fitted into the filling port, leading to unreliable sealing.
Innovation Solution
The energy storage device incorporates a shaft part and a projecting part with a metal member, where the shaft part is inserted into the filling port, and the projecting part projects orthogonally from the shaft's periphery, bonded to the case, forming a recess and space around the filling port to reduce contact area and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the press-fit member is inserted deeply into the electrolyte solution filling hole, then the closing function is improved, but the contact area between electrolyte solution and press-fit member increases causing leakage
Solution Approach 1:
By dividing the plug into press-fit member and sealing member, the patent eliminates the harmful effect of electrolyte solution contact with the press-fit member. The sealing member creates a barrier that prevents leakage while allowing the press-fit member to be inserted deeply for effective closing
Solution Approach 2:
The harmful function of the press-fit member (causing leakage through contact with electrolyte solution) is extracted and eliminated. The sealing member takes over the bonding function while the press-fit member focuses solely on the closing function, preventing electrolyte solution from reaching the bonding area
Data Source
AI summary
An energy storage device includes a case. The case includes a cover body where an electrolyte solution filling port is formed, and an electrolyte solution plug that closes the electrolyte solution filling port. The electrolyte solution plug includes a shaft part inserted into the electrolyte solution filling port, and a projecting part that projects from a periphery of the shaft part and is bonded to the cover body. In the cover body, a space adjacent to the shaft part is formed around the electrolyte solution filling port, and a tip end of the shaft part is disposed in the electrolyte solution filling port.