Secondary Battery Folded Seal for Vibration-Stable Board Connection
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Solution Overview
Problem
Secondary batteries with cutout portions experience positional deviation due to vibration, leading to lost electrical connection and damage, increased impedance, reduced thickness, and capacity limitations.
Innovation Solution
A secondary battery design with a folded seal portion along the peripheral edge, acting as a stopper to prevent positional deviation, and a reduced external terminal length to minimize impedance, while maintaining electrical connection and enhancing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a gap is maintained between the secondary battery and the board in the cutout portion, then the influence of heat generation is reduced, but the electrical connection is lost and/or mutual damage occurs due to vibration
Solution Approach 1:
The seal portion is designed to be foldable, allowing it to dynamically adjust its position. When vibration occurs, the seal portion can fold to maintain contact with the board, ensuring continuous electrical connection while still providing thermal isolation when needed
Solution Approach 2:
The seal portion changes its physical state from extended (providing gap for thermal isolation) to folded (providing mechanical support for electrical connection). This parameter change allows the system to adapt between thermal management and electrical connection requirements
2Length of stationary object
If the external terminal is lengthened to secure the gap, then the gap is maintained, but the impedance of the secondary battery increases
Solution Approach 1:
The seal portion acts as an intermediary structure that maintains the gap distance without requiring terminal extension. By folding the seal portion, the gap is secured while the terminal remains short, avoiding impedance increase
3Temperature
If the gap is maintained between battery and board, then thermal influence is reduced, but the thickness and size increase and capacity decreases
Solution Approach 1:
The foldable seal portion provides thermal isolation gap when extended, but folds flat when not needed, eliminating dead space. This dynamic behavior allows thermal management without permanent increase in battery thickness or size
Data Source
AI summary
A secondary battery including an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte encapsulated in an exterior body. The exterior body has a shape with a cutout portion in planar view thereof, and the exterior body has a seal portion along a peripheral edge portion thereof. The seal portion is folded in a thickness direction of the secondary battery to form a folded seal portion having an end on a cutout portion side to form a stopper portion for a board disposed in the cutout portion.