Battery Can Recess and Insulator Layout for Overdischarge Reliability
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Solution Overview
Problem
Conventional secondary batteries face limitations in improving battery characteristics and reliability, particularly in preventing can dissolution during overdischarge and maintaining insulation and contamination resistance.
Innovation Solution
The secondary battery design includes a can with recesses and an insulator with holes, ensuring no overlap between them, with an overlap ratio of 13% or less and an opening ratio of 5% to 40%, using an insulating plate and non-woven fabric to collect contamination and maintain insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the can has recesses to prevent dissolution, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The can bottom is segmented into multiple recess regions rather than a single complex structure. This segmentation simplifies the manufacturing process by using standard pressing techniques to create multiple simple recesses, while collectively providing effective dissolution prevention through distributed structural support
Solution Approach 2:
The recesses are pre-formed into the can bottom during the can manufacturing process before battery assembly. This preliminary action prevents dissolution by providing structural reinforcement in advance, eliminating the need for post-assembly modifications and reducing overall manufacturing complexity
Data Source
AI summary
A secondary battery having excellent battery characteristics and excellent reliability is provided. The secondary battery includes an electrode, an electrolytic solution, a can configured to accommodate the electrode and the electrolytic solution, and an insulator disposed between the electrode and the can, wherein a can bottom of the can has at least one recess, the insulator has at least one hole, and at least a part of the at least one recess and at least a part of the at least one hole have no overlap with each other.