Battery Exterior Body Structure for Terminal Insulation Under Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The insulating property between the metal plate and the exterior body of a secondary battery can deteriorate due to peeling off, leading to a decrease in safety, as the flat plate-shaped metal plate may separate from the insulating material and the exterior body under increased pressure.
Innovation Solution
The exterior body is designed with a cavity and the peripheral edge of the cavity and the outer edge of the metal plate are bent to be separated from the insulating material, enhancing the insulating and sealing properties by increasing the thickness of the insulating material in the contact areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat plate-shaped metal plate is used as an electrode terminal bonded to the exterior body via an insulating material, then the electrical connection is simple and effective, but the insulating property deteriorates due to peeling off under increased pressure
Solution Approach 1:
The metal plate is configured with a bent peripheral edge that follows the curvature of the exterior body's cavity, transforming the flat plate shape into a curved configuration. This curvature enables the insulating material to be interposed more effectively between the metal plate and exterior body, preventing direct contact and maintaining insulating properties even under pressure increases.
Solution Approach 2:
The invention introduces a spatial dimension by bending the metal plate's peripheral edge to follow the cavity's curvature, creating a three-dimensional configuration rather than a flat two-dimensional bond. This dimensional change allows the insulating material to be positioned in the gap between the curved metal plate and the exterior body surface, enhancing insulation reliability.
2Strength
If the metal plate is pressed against the exterior body for secure bonding, then the bonding strength increases, but the insulating material may be compressed or damaged, deteriorating the insulating property
Solution Approach 1:
The bent peripheral edge of the metal plate creates a curved configuration that naturally maintains a gap between the metal plate and the exterior body surface. This curvature prevents complete compression of the insulating material during bonding, allowing the insulating property to be maintained even when bonding pressure is applied to secure the connection.
3Reliability
If the peripheral edge of the metal plate is bent to follow the cavity curvature, then the insulating property is improved by preventing direct contact, but the manufacturing complexity increases
Solution Approach 1:
The metal plate is formed with a bent peripheral edge that follows the cavity's curvature. This curved configuration can be manufactured using conventional metal forming techniques such as bending or rolling, which are standard processes in battery manufacturing. The curvature is achieved through controlled deformation of the metal plate, making the manufacturing process feasible without requiring complex specialized equipment.
Data Source
AI summary
Provided is a secondary battery including an electrode assembly and an exterior body that houses the electrode assembly. In the secondary battery, the exterior body includes a metal plate joined via an insulating material interposed therebetween, and the exterior body has a cavity, and one of a peripheral edge of the cavity and an outer edge of the metal plate is bent so as to be separated from the insulating material.