Hermetic Battery Seal Structure for Impact-Resistant Lead Connection
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Solution Overview
Problem
Existing hermetically sealed batteries fail to maintain electrical connection between the electrode body and terminal when subjected to impacts in directions perpendicular to the electrode plate group, leading to disconnection of the current collecting lead and increased internal resistance.
Innovation Solution
The battery design includes an insulator with a plate part extended in the radial direction, featuring cut-away portions and a flange portion to restrict movement of the electrode body and internal lead, enhancing impact resistance and maintaining electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the current collecting lead is not sufficiently extended, then the battery structure is simpler, but a tension occurs in the current collecting lead when impact is applied in the XY direction, causing disconnection
Solution Approach 1:
The patent pre-extends the current collecting lead beyond what is minimally required, creating excess length that can absorb impact forces. This preliminary action ensures that when XY-direction impacts occur, the lead has sufficient slack to prevent tension and disconnection, thereby maintaining electrical connection reliability without requiring complex additional structures.
2Device complexity
If the internal lead is allowed to move freely, then the battery structure is simpler, but the internal lead disconnects from the current collecting lead under drop impact
Solution Approach 1:
The patent employs the extended current collecting lead as a flexible element that can bend and deform to absorb impact forces. This flexible approach allows the internal lead to move during impact while maintaining connection, avoiding the need for rigid constraint structures while ensuring reliability under drop conditions.
3Device complexity
If the electrode body is not constrained, then the battery structure is simpler, but the electrode body moves under impact causing internal resistance increase
Solution Approach 1:
The extended current collecting lead serves multiple functions: it provides electrical connection, acts as a shock absorber through its flexibility, and simultaneously constrains the electrode body position. This multi-functional design prevents electrode body movement and maintains electrical connection reliability without requiring separate constraint structures, thus avoiding increased device complexity.
Data Source
AI summary
A hermetically sealed battery includes a battery can having a bottomed cylindrical shape and an opening, an electrode body accommodated in the battery can, a sealing plate covering the opening of the battery can, a rivet disposed on the sealing plate and serving as a terminal, an insulator insulates the sealing plate from the rivet, and an internal lead electrically connected to the rivet. The insulator includes a sealing part sealing between the sealing plate and the rivet and a plate part closer to the electrode body than the sealing part, the plate part being extended in a radial direction of the electrode body. The plate part has a cut-away portion recessed in a periphery of the plate part in the radial direction. The internal lead is partially disposed in the cut-away portion.