Pouch Secondary Battery Electrode Layout for Lower Internal Resistance
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Solution Overview
Problem
Existing secondary batteries face challenges in reducing internal resistance and enhancing output capacity due to the long current path caused by the positioning of electrode terminals on the upper ends of the electrode assembly, leading to increased electrical resistance.
Innovation Solution
The secondary battery design includes a first and second uncoated portion on opposite sides of the electrode assembly, with integrated electrode terminals extending in the longitudinal direction, and a pouch unit that accommodates the assembly, featuring a sealing portion that folds over the terminals to minimize the current path and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode terminals are positioned on the upper ends of the electrode assembly, then the battery structure is simple and easy to manufacture, but the current path becomes long and electrical resistance increases
Solution Approach 1:
The patent transitions from a single-terminal configuration (upper end only) to a multi-dimensional terminal arrangement by positioning uncoated portions and terminals at both upper and lower ends of the electrode assembly in the width direction, effectively utilizing three-dimensional space to shorten current paths without complicating the manufacturing process
2Device complexity
If electrode terminals are positioned on the upper ends of the electrode assembly, then the battery structure is simple, but the output capacity is limited due to long current path
Solution Approach 1:
The patent segments the terminal connection points into multiple locations (upper end and lower end of the electrode assembly in the width direction) rather than concentrating them at a single upper position, creating parallel current paths that reduce overall resistance and enhance power output while maintaining structural simplicity
Data Source
AI summary
A secondary battery includes: an electrode assembly comprising a first electrode plate, a second electrode plate, and a separator, the electrode assembly being formed such that a first uncoated portion connected to the first electrode plate is located on one side of the electrode assembly in a width direction and a second uncoated portion connected to the second electrode plate is on an opposite side of the electrode assembly in the width direction; a pouch unit accommodating the electrode assembly; a first electrode terminal electrically connected to the first uncoated portion and located on one side of the pouch unit in the width direction; and a second electrode terminal electrically connected to the second uncoated portion and located on an opposite side of the pouch unit in the width direction.