Power Storage Restraint Plate Structure for Insulation Protection
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Solution Overview
Problem
Existing power storage devices face insulation deterioration when external forces are applied, particularly in directions intersecting the stacking direction of bipolar electrodes, due to damage to insulation members between bipolar electrodes and restraint plates.
Innovation Solution
The power storage device incorporates a design with projecting portions on the restraint plates that absorb external forces, protecting the insulating plates and maintaining insulation integrity by positioning these projections beyond the terminal base protection portion, which covers the terminal base between the projecting portions, thereby curbing damage from external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation members are disposed between bipolar electrodes and restraint plates to provide electrical insulation, then insulation properties are improved, but the insulation members are vulnerable to damage when external forces are applied in directions intersecting the stacking direction
Solution Approach 1:
The restraint plate includes a projecting portion that protrudes beyond the insulating plate in the second direction. This projecting portion acts as a cushioning element that absorbs external forces applied in directions intersecting the stacking direction, protecting the insulating plate from damage before the force can reach it.
Solution Approach 2:
The projecting portion of the restraint plate serves as an intermediary element between the external force and the insulating plate. It intercepts and absorbs the external force, preventing direct transmission to the insulating plate and maintaining insulation integrity.
2Strength
If the restraint plate is designed to absorb external forces through projecting portions, then damage resistance of insulating members is improved, but the device structure becomes more complex
Solution Approach 1:
The restraint plate is segmented with a projecting portion that extends beyond the insulating plate. This segmentation allows the restraint plate to perform dual functions: maintaining structural constraint and providing protective cushioning, without requiring separate protective components.
Solution Approach 2:
The projecting portion of the restraint plate serves multiple functions: it maintains the structural constraint of the stacked body and simultaneously provides protective cushioning against external forces. This multi-functionality reduces the need for additional separate protective components.
Data Source
AI summary
A power storage device includes a pair of restraint plates configured to sandwich and restrain a stacked body, a pair of current collector plates, and a pair of insulating plates in a first direction; and a terminal base configured to be provided on a side surface of at least one of the restraint plates extending in a third direction intersecting both the first direction and a second direction, and the first direction, and have a terminal bolt fixed thereto. The at least one of the restraint plates is configured to have a pair of projecting portions projecting in the second direction beyond the side surface having the terminal base fixed thereto when viewed in the first direction.