Battery Case Current Collector Structure for Through-Hole Sealing
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Solution Overview
Problem
The reliability of sealing properties around through holes in electrical storage devices, such as batteries, is compromised due to the complexity of the conductive path from the electrode body to the terminal, which can lead to leakage and reduced performance.
Innovation Solution
An electrical storage device design featuring a first current collecting member with a projection part and slits, where the insulating member easily enters the slits, enhancing the sealing properties around the through hole by integrating the insulating member with the case and current collecting member, thereby simplifying the conductive path and improving airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a through hole is provided in the case to create a conductive path from the electrode body to the terminal, then the electrical connection is simplified, but the sealing reliability deteriorates due to potential leakage around the through hole
Solution Approach 1:
An insulating member is introduced as an intermediary substance that fills the space between the current collecting member and the case wall. This insulating member acts as a mediator that simultaneously provides electrical insulation and maintains sealing integrity around the through hole, preventing leakage while allowing the conductive path to function.
Solution Approach 2:
The insulating member is specifically positioned only in the critical region around the through hole where sealing is needed, rather than throughout the entire device. This localized application of insulation material provides sealing protection at the vulnerable through hole area without interfering with the overall conductive path functionality.
2Adaptability or versatility
If multiple separate components are used to form the conductive path (terminal, current collecting member, insulating member), then each component can be optimized independently, but the overall device complexity increases
Solution Approach 1:
The insulating member is integrally molded with both the case and the current collecting member, merging three separate components (case, insulating member, current collecting member) into a single integrated structure. This reduces the number of discrete parts and assembly steps while maintaining the ability to optimize each functional region independently during the molding process.
Solution Approach 2:
The insulating member serves multiple functions simultaneously: it provides electrical insulation between the current collecting member and the case, maintains sealing integrity around the through hole to prevent leakage, and structurally connects the case and current collecting member. This multi-functionality reduces the need for separate components.
Data Source
AI summary
Provided is an electrical storage device, having high reliability of sealing properties in the vicinity of a through hole. The electrical storage device disclosed herein includes an electrode body, a case, and a first current collecting member. The case includes a first wall having a first through hole. The first current collecting member has a first region placed along the inner surface of the first wall. A projection part, projecting to the first wall, is in the first region. A part of the projection part is in the first through hole. The first current collecting member has a first slit is between the first region and a second region on the opposite site of the first side. The second region is placed along the inner surface of the first wall. The second region faces the inner surface of the first wall with the insulating member therebetween.