Prismatic Battery Cover Joint Insulation for Vibration Impact
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Solution Overview
Problem
Prismatic secondary batteries face the challenge of the electrode body coming into contact with the current collector and sealing plate, especially under impact or vibration, which can lead to reduced reliability and energy density.
Innovation Solution
The battery design incorporates an inner insulating member and a cover made of resin between the sealing plate and the current collector, with a cover joint extending towards the sealing plate, preventing direct contact between the electrode body and the current collector and sealing plate, and allowing for increased volume energy density through strategically placed tabs and current collectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode body is enlarged to increase volume energy density, then the volume energy density is improved, but the electrode body may come into contact with the current collector and sealing plate under impact or vibration, reducing reliability
Solution Approach 1:
An insulating member is introduced as an intermediary component between the electrode body and the current collector. This insulating member prevents direct contact between the electrode body and current collector while allowing the electrode body to maintain its enlarged size for high volume energy density. The insulating member acts as a mediator that resolves the conflict between maximizing electrode body size and preventing harmful contact under vibration or impact conditions.
2Reliability
If the electrode body is secured firmly to prevent contact, then reliability is improved, but the ability to absorb impact and vibration is reduced
Solution Approach 1:
The insulating member is positioned in advance between the electrode body and current collector to provide cushioning protection. This pre-positioned insulating member absorbs and mitigates the effects of impact and vibration before they can cause harmful contact between the electrode body and current collector, thus protecting the battery structure while maintaining reliability.
3Reliability
If insulating members are added to prevent contact, then reliability is improved, but the device complexity increases
Solution Approach 1:
The insulating member is designed to perform multiple functions simultaneously: it provides electrical insulation to prevent contact between the electrode body and current collector, acts as a cushioning element to absorb impact and vibration, and serves as a structural support component. By combining these functions into a single component, the design achieves improved reliability without proportionally increasing device complexity.
Data Source
AI summary
A secondary battery includes an electrode body that includes a positive-electrode sheet and a negative-electrode sheet, an exterior body that accommodates the electrode body, a sealing plate that seals an opening of the exterior body, a positive-electrode terminal that is secured to the sealing plate, a positive-electrode tab that is connected to the positive-electrode sheet, a first positive-electrode current collector that is connected to the positive-electrode terminal and electrically connected to the positive-electrode tab, an inner insulating member that is disposed between the sealing plate and the first positive-electrode current collector, and a cover that is composed of a resin and disposed between the first positive-electrode current collector and the electrode body. The cover includes a cover portion that faces the first positive-electrode current collector and a cover joint that extends from the cover portion toward the sealing plate. The cover joint is connected to the inner insulating member.