Power Storage Module Venting With Individual Pressure Relief
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Solution Overview
Problem
The existing power storage devices require a large number of components to manage pressure relief as the number of stacked bipolar electrodes increases, which is inefficient and undesirable.
Innovation Solution
A power storage module with a seal portion and sheet member configuration that includes communication holes and stress concentrating portions, allowing for individual and irreversible pressure relief without increasing the number of components, where the cleavage pressure is lower than the peeling pressure, enabling efficient internal pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of stacked bipolar electrodes is increased, then the power storage capacity is improved, but the number of components such as second seal portions must be increased proportionally, leading to increased device complexity
Solution Approach 1:
Multiple second seal portions are integrated into a single sheet member that spans across multiple communication portions. This sheet member contains multiple facing portions, each corresponding to a different communication portion, allowing one component to perform the function of multiple separate seal portions while maintaining the ability to individually seal each communication hole
Solution Approach 2:
The sheet member is divided into multiple facing portions, each with its own stress concentrating portion that can be independently cleaved. This segmentation allows individual pressure relief for each internal space while using a single integrated component, resolving the contradiction between handling multiple electrodes and managing multiple components
2Reliability
If separate second seal portions are used for each communication portion, then individual pressure relief is achieved, but the manufacturing complexity and component assembly increase significantly
Solution Approach 1:
Multiple sealing functions are combined into a single sheet member that can be installed as one piece. The sheet member includes multiple facing portions connected by joint portions, allowing it to seal multiple communication holes simultaneously without requiring multiple separate installation operations
Solution Approach 2:
The sheet member is designed to be inserted into the communication portions and automatically positioned by the geometry of the communication holes and the sheet member itself. The stress concentrating portions are pre-formed to cleave at specific pressures, eliminating the need for complex assembly procedures or additional components
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 module effectively relieves internal pressure individually and irreversibly while maintaining a reduced component count, ensuring collective sealing and preventing re-use after pressure release.
Implementation Method 1
The respective facing portion have stress concentrating portions that serve as starting points of the cleaving
Data Source
AI summary
A power storage module includes a stack formed of electrodes stacked each including a current collector and an active material layer, a seal portion defining internal spaces, communication holes providing communication between the internal spaces and an outside, and a sheet member sealing the communication holes individually and cleaved to release internal pressure in the respective internal spaces. The sheet member has facing portions and a joint portion joined to the seal portion. The respective facing portions have stress concentrating portions. Cleavage pressure, which is the internal pressure applied to corresponding one of the facing portions when one of the stress concentrating portions is cleaved, is lower than peeling pressure, which is the internal pressure applied to corresponding one of the facing portion when the joint portion is peeled off from the seal portion.