Current Interrupt Sealing Structure for Pressure-Activated Power Storage
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Solution Overview
Problem
The operational reliability of current interrupt devices in power storage devices is compromised when the lead and the base part of the gasket undergo deformation, causing the lead to displace along with the projection.
Innovation Solution
Incorporating a displacement suppressing means within the case to prevent the lead from displacing when the displacement part of the sealing plate moves away from the lead, thereby maintaining electrical connection and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection is displaced in response to internal pressure increase to disconnect the lead, then the current interrupt function is achieved, but the lead displacement reduces operational reliability
Solution Approach 1:
The sealing plate is divided into a fixed outer circumferential part (held by the compression part) and a movable displacement part (projection). This segmentation allows the projection to displace for current interruption while the outer circumferential part remains stable, preventing lead displacement and maintaining operational reliability.
2Ease of operation
If the lead is allowed to displace with the projection during pressure increase, then the current interrupt device functions, but the electrical connection stability deteriorates
Solution Approach 1:
The sealing plate is segmented into a fixed outer circumferential part and a movable displacement part. The fixed part maintains stable electrical connection with the lead, while the movable part enables current interruption function when needed.
Solution Approach 2:
The compression part acts as an intermediary that holds the outer circumferential part of the sealing plate in place, providing a stable anchor point that prevents lead displacement while allowing the projection to move freely for its interrupt function.
3Reliability
If the base part and lead undergo deformation during operation, then the current interrupt mechanism activates, but the structural integrity is compromised
Solution Approach 1:
The sealing plate is divided into a fixed outer circumferential part supported by the compression part and a movable displacement part. This segmentation concentrates deformation in the projection area, preserving the structural integrity of the base part and lead while still enabling current interrupt mechanism activation.
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
The implementation of displacement suppressing means effectively prevents lead displacement, ensuring reliable operation of the current interrupt device by maintaining electrical disconnection between the displacement part and the lead.
Implementation Method 1
the gasket includes a compression part interposed between the tube part and the sealing plate
Implementation Method 2
the displacement part is configured to be displaced in a direction away from the lead in response to an increase in an internal pressure of the case
Data Source
AI summary
A power storage device includes a case, a power storage element, a band-shaped lead, and a sealing member. The sealing member includes an insulating gasket including a base part, and a conductive sealing plate. The sealing plate includes a displacement part. The displacement part of the sealing plate and the lead are electrically connected to each other. The displacement part is configured to be displaced in a direction away from the lead in response to an increase in an internal pressure of the case, thereby electrically disconnecting the displacement part and the lead from each other. The power storage device further includes displacement suppressing means disposed in the case and configured to suppress displacement of the lead when the displacement part is displaced in the direction away from the lead. Thus, it is possible to increase the operational reliability of a current interrupt device.