Sealed Battery Vent Assembly With Folded Elastic Recontact Prevention
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Solution Overview
Problem
The existing sealed battery sealing assemblies may experience recontact between the vent member and the metal plate after initial pressure relief, leading to reconduction, which is not effectively prevented by the conventional design.
Innovation Solution
A sealed battery design incorporating a gasket and an insulating plate with an elastic deformation part between the metal plate and the vent member, which separates and deforms to prevent recontact and reconduction when internal pressure exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vent member inverts to block electric conduction when internal pressure rises, then safety is improved, but recontact and reconduction may occur reducing reliability
Solution Approach 1:
An insulating plate is introduced as an intermediary component between the vent member and the metal plate. This insulating plate prevents direct contact and reconduction between the vent member and the metal plate, while still allowing the vent member to invert for pressure relief. The insulating plate acts as a mediator that maintains electrical isolation while permitting mechanical movement.
Solution Approach 2:
The sealing assembly is segmented into distinct functional components: the vent member for pressure relief, the metal plate for electrical connection, and the insulating plate for electrical isolation. This segmentation allows each component to perform its specific function independently, preventing reconduction while maintaining the overall safety mechanism.
2Reliability
If the amount of deformation of the vent member is enlarged to prevent reconduction, then reliability is improved, but the designed dimensional leeway is constrained
Solution Approach 1:
The insulating plate serves as a mediator that enables reliable prevention of reconduction without requiring excessive deformation of the vent member. By introducing this intermediate component, the system achieves high reliability while maintaining appropriate dimensional leeway for the vent member's inversion movement.
Solution Approach 2:
The insulating plate changes the physical parameters of the sealing assembly by introducing a component with different material properties (electrical insulation). This parameter change allows the vent member to maintain its deformation characteristics while achieving reliable reconduction prevention through the insulating barrier provided by the plate.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces the likelihood of recontact between the vent member and the metal plate, enhancing the structural deformation leeway and preventing reconduction, thereby improving the battery's pressure relief mechanism.
Implementation Method 1
an elastic deformation part that is to deform in a direction toward the vent member when the separation part of the metal plate is separated from the annular part is provided in the insulating plate or the gasket
Data Source
AI summary
A sealed battery including a battery case that includes a cylindrical exterior can having a bottom and an opening sealing body that closes an opening of the outer can; a gasket that is arranged between the exterior can and the opening sealing body; and an electrode body. The opening sealing body includes: a metal plate with an annular part to which an electrode lead is electrically connected, and a disconnecting part that is separated from the annular part when the inner pressure of the battery case exceeds a predetermined threshold; a valve body that is arranged further to the outside of the battery case than the metal plate; and an insulating plate that is arranged between the metal plate and the valve body. The insulating plate or the gasket is provided with an elastic deformation part that deforms in the direction of the valve body.