Wound Battery Cell Sealing Structure for Capacity and Vibration Reliability
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Solution Overview
Problem
Conventional battery designs face limitations in increasing capacity due to the need for a blind rivet to seal the electrolytic solution injection hole, which can damage the electrode body, and the risk of damage from vibrations when the sealing member contacts the electrode body, especially when the sealing member is disposed between the lid body and the curved portion of the electrode body.
Innovation Solution
A battery design featuring a hexahedron-shaped battery case with a wound electrode body, an electrolytic solution injection hole positioned not to overlap with the vertexes of the curved portions, and an insulating member and sealing member disposed in a valley portion between adjacent electrode bodies, allowing for increased height and reduced risk of damage from vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the sealing member is disposed close to the electrode body to shorten the distance, then the battery capacity can be increased, but the electrode body may be damaged due to contact with the sealing member under vibration or impact
Solution Approach 1:
An insulating member is introduced as an intermediary between the sealing member and the electrode body. The insulating member is disposed in the valley portion to provide electrical insulation and physical buffering, preventing direct contact between the sealing member and electrode body while allowing the sealing member to be positioned closer to the electrode body for increased capacity
Solution Approach 2:
The insulating member is pre-positioned in the valley portion between adjacent wound electrode bodies to cushion against potential contact between the sealing member and electrode body during vibration or impact. This beforehand cushioning prevents damage before it can occur
2Reliability
If a blind rivet is used to seal the electrolytic solution injection hole, then the sealing function is achieved, but the tip end of the rivet may contact and damage the electrode body
Solution Approach 1:
The insulating member serves as a mediator between the blind rivet sealing member and the electrode body, preventing direct contact while maintaining the sealing function. The insulating member is disposed in the valley portion to provide both insulation and physical separation
3Reliability
If the electrolytic solution injection hole is positioned to avoid overlapping with vertexes of curved portions, then the risk of damage is reduced, but the available space for electrode body arrangement is limited
Solution Approach 1:
The insulating member is positioned in the valley portion, utilizing the three-dimensional space between adjacent wound electrode bodies. This dimensional placement allows the electrolytic solution injection hole to be positioned optimally for damage prevention while the insulating member fills the intervening space, effectively increasing the usable volume for electrode arrangement
Data Source
AI summary
A battery disclosed herein includes a wound electrode body, a battery case having a substantially rectangular first surface, and an electrolytic solution injection hole formed on the first surface of the battery case, a sealing member for sealing the electrolytic solution injection hole, and an insulating member fixed to the first surface. The electrolytic solution injection hole is formed in a position that does not overlap with vertexes of the curved portions of the plurality of wound electrode bodies. Herein, a part of the insulating member is disposed in a valley portion surrounded by a surface linking the vertexes of the adjacent wound electrode bodies and the curved surface of the curved portion of the adjacent wound electrode bodies, and a part of the sealing member is disposed in the valley portion.