Power Storage Module Plate Structure for Electrolyte Retention
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Solution Overview
Problem
Conventional power storage modules with stacked electrode assemblies face challenges in retaining electrolyte solution effectively, leading to suboptimal battery performance due to insufficient liquid retention performance.
Innovation Solution
Incorporation of plate-like members with curved or distorted surfaces and through-holes within the housing to create spaces and channels for electrolyte solution retention, facilitating its distribution and retention within the stacked electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional stacked electrode assembly is used without additional retention structures, then the device complexity is low, but the electrolyte solution retention performance is insufficient
Solution Approach 1:
The housing is divided into multiple compartments by partition walls, with each compartment containing a stacked electrode assembly. This segmentation allows independent electrolyte retention in each compartment, preventing electrolyte loss while maintaining manageable structural complexity through modular design
Solution Approach 2:
Plate-like members are introduced as intermediary structures between the housing and electrode assemblies. These plates create retention spaces that actively hold electrolyte solution, serving as mediators that improve retention performance without requiring fundamental changes to the basic stacked electrode structure
2Reliability
If the plate-like member has a flat surface, then the manufacturing is simple, but the electrolyte solution retention at middle portions is insufficient
Solution Approach 1:
The facing surface of the plate-like member is designed to be curved or distorted rather than flat, creating varied spacing between the plate and electrode assembly. This curvature generates retention spaces that effectively trap electrolyte solution at middle portions of the electrode assembly, improving retention without excessive manufacturing complexity
Solution Approach 2:
The plate-like member features localized thickness variations with different thicknesses at different positions. This local quality variation creates targeted retention spaces at critical areas (middle portions) where electrolyte retention is most needed, while maintaining simpler structures at other areas
3Productivity
If through-holes are not provided in the plate-like member, then the structure is simple, but the electrolyte solution supply to electrode assembly is insufficient
Solution Approach 1:
The plate-like member incorporates through-holes that create a porous-like structure, enabling electrolyte solution to pass through the plate and reach the electrode assembly. This porous configuration significantly improves electrolyte supply efficiency while adding minimal structural complexity, as the holes can be formed through standard manufacturing processes
Data Source
AI summary
A power storage module includes: a stacked electrode assembly which includes a plurality of electrodes stacked in a first direction and is impregnated with an electrolyte solution; and a housing accommodating the stacked electrode assembly. The housing and the stacked electrode assembly extend in a second direction perpendicular to the first direction. The power storage module further includes a plate-like member extending in the second direction and disposed facing the stacked electrode assembly within the housing. The plate-like member is disposed so that a thickness direction of the plate-like member is a third direction perpendicular to the first direction and the second direction. The plate-like member has a facing surface facing the stacked electrode assembly. At least a portion of the facing surface is curved or distorted along the second direction. The facing surface being curved or distorted forms a space between the facing surface and the stacked electrode assembly.