Battery Terminal Recess Design for Module Assembly
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Solution Overview
Problem
Existing battery designs face challenges in assembling battery modules with low terminal resistance, as the exposed terminal area is limited, leading to increased resistance and interference issues during stacking.
Innovation Solution
A battery design featuring a container member with a main part thicker than the terminal-connecting part, allowing the terminal to be recessed and providing a larger exposed area for power distribution, and a bus bar connection without protruding from the main surface, facilitating easy assembly into a battery module with reduced terminal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the terminal is exposed from the side surface to increase the exposed area for power distribution, then the terminal resistance is reduced, but the terminal protrudes from the main surface causing interference during battery module assembly
Solution Approach 1:
The terminal is configured to extend in the thickness direction of the container member rather than protruding from the side surface. This dimensional change allows the terminal to be recessed relative to the main surface while still providing sufficient exposed area for power distribution, thereby resolving the conflict between reducing terminal resistance and facilitating assembly.
2Reliability
If the terminal area is increased to reduce terminal resistance, then the allowable current is increased, but the battery structure becomes more complex
Solution Approach 1:
The container member is designed with non-uniform thickness, where the thickness varies in the thickness direction at different positions. Specifically, the thickness is greater where the terminal is recessed and thinner at other areas. This local variation in thickness allows the terminal to be recessed while maintaining structural integrity and providing sufficient exposed area, thereby reducing terminal resistance without significantly increasing overall structural complexity.
3Ease of operation
If the container member thickness is increased to recess the terminal, then the terminal can be positioned lower to avoid interference, but the battery volume increases
Solution Approach 1:
The container member employs local thickness variation rather than uniform thickness increase. The thickness is selectively increased only in the regions where terminal recessing is required, while other areas maintain thinner profiles. This localized approach allows the terminal to be properly recessed to avoid interference during assembly while minimizing the overall volume increase of the battery.
Data Source
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AI summary
According to one embodiment, a battery is provided. The battery includes an electrode body, a lead, a container member, and a terminal. The container member includes a main part and a terminal-connecting part adjacent to the main part. The electrode body is housed in the main part of the container member. The lead is electrically connected to the electrode body. The lead is housed in the terminal-connecting part of the container member. The terminal is electrically connected to the lead. The terminal is provided on the terminal-connecting part. A thickness of the main part of the container member is larger than a thickness of the terminal-connecting part of the container member.