Secondary Battery Insulating Member Alignment and Shock Absorption
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Solution Overview
Problem
Current secondary battery configurations face challenges in achieving stable manufacturing processes and ensuring safety while maintaining battery capacity, particularly in compact designs like coin or button types, due to issues with electrode alignment, electrolyte impregnation, and shock resistance.
Innovation Solution
A secondary battery design featuring a flat and columnar shape with an insulating film having a through hole that overlaps with the battery's winding center space, adhered to the battery device to stabilize electrode alignment and facilitate electrolyte impregnation, and an unadhered portion to absorb shocks, enhancing manufacturing stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating plate is disposed between the electrode group and the bottom surface of the battery case, then safety upon overcharge is ensured, but misalignment of the insulating plate occurs
Solution Approach 1:
The insulating plate is divided into a first insulating plate and a second insulating plate positioned at different locations. The first insulating plate is disposed between the electrode group and the bottom surface, while the second insulating plate is disposed between the electrode group and the side surface. This segmentation allows each plate to perform its specific function independently, improving both safety and alignment stability.
2Quantity of substance
If the electrode assembly is designed for high-density impregnation with electrolytic solution, then battery capacity is improved, but manufacturing stability deteriorates
Solution Approach 1:
The insulating structure is segmented into multiple plates positioned at different locations (bottom and side surfaces). This segmentation allows the electrolytic solution to access the electrode assembly through multiple pathways while maintaining stable positioning of each insulating plate, thus achieving both high battery capacity and manufacturing stability.
Solution Approach 2:
The insulating plates serve as intermediaries between the electrode group and the battery case walls. They provide controlled pathways for electrolyte impregnation while maintaining precise positioning, enabling high-density electrode assembly to be properly impregnated without compromising manufacturing stability.
3Volume of moving object
If a crimped can is used to contain the battery device, then compact design is achieved, but shock resistance deteriorates
Solution Approach 1:
Insulating plates are disposed between the electrode group and both the bottom surface and side surfaces of the battery case. These plates act as cushioning elements that absorb and distribute shock forces before they reach the electrode group, providing beforehand protection against mechanical damage while maintaining the compact crimped can design.
Data Source
AI summary
A secondary battery includes an outer package member, a battery device, and an insulating member. The outer package member has a flat and columnar shape and includes a first bottom part and a second bottom part opposed to each other. The battery device is contained inside the outer package member, and has a first through hole extending from the first bottom part toward the second bottom part. The insulating member is adhered in part to the battery device between the second bottom part and the battery device, and has a second through hole at a position overlapping with the first through hole.