Power Storage Module Double Sealing Structure
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Solution Overview
Problem
In bipolar batteries, clearance between the separator and resin seal portions can lead to a risk of short circuits between electrode plates due to deformation during formation or changes in internal pressure, which existing technologies fail to adequately prevent.
Innovation Solution
A power storage module design featuring a cylindrical resin portion with a double sealing structure, where the first seal portion is joined to the peripheral edge of the electrode plates and the second seal portion covers the outer surface, ensuring that separators are always positioned between adjacent electrode plates, thus preventing direct contact and potential short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single seal portion is used to seal the electrode plates, then the structure is simple, but clearance may exist between the separator and seal portion causing short circuit risk
Solution Approach 1:
The seal portion is divided into a first seal portion that seals the peripheral edge portions of electrode plates and a second seal portion that seals the outer peripheral surface of the first seal portion. This segmentation creates a double sealing structure that eliminates clearance between separators and seal portions, preventing short circuits while maintaining structural simplicity through modular design.
2Reliability
If the separator is positioned close to the electrode plates, then short circuit prevention is improved, but deformation during formation or pressure changes may cause contact
Solution Approach 1:
The double seal portion structure is designed in advance to accommodate potential deformation of electrode plates during formation or use. The first seal portion seals electrode plate edges while the second seal portion seals the outer surface, creating a buffered sealing system that maintains separator positioning stability even when electrode plates deform or internal pressure changes occur.
3Reliability
If a double sealing structure is implemented, then short circuit prevention is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The first seal portion and second seal portion are merged into an integrated double sealing structure where the second seal portion is disposed outside and seals the outer peripheral surface of the first seal portion. This merging approach simplifies manufacturing by creating a unified sealing system that can be implemented as a single assembly unit, reducing the complexity of multiple separate sealing operations.
Data Source
AI summary
A power storage module includes a cylindrical resin portion that extends in a direction in which a plurality of bipolar electrodes is stacked and that accommodates therein the plurality of the bipolar electrodes. The resin portion includes a first seal portion that has a cylindrical shape and is joined to peripheral edge portions of a plurality of electrode plate, and a second seal portion that has a cylindrical shape and is disposed outside the first seal portion in a direction that crosses the stacking direction of the bipolar electrodes. A plurality of separators is disposed such that outer peripheral ends of the separators are located between an outer peripheral end of the first seal portion and an inner peripheral end of the first seal portion.