Large-Area Power Storage Cell Electrode Structure for Electrolyte Return
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Solution Overview
Problem
Large-area power storage cells experience liquid shortage and decreased output due to electrolyte solution extrusion during high-rate charging and discharging, as the electrolyte solution is difficult to return to the center portion of the electrode mixture layer, leading to a decrease in charge and discharge performance.
Innovation Solution
The power storage cell design includes a first electrode mixture layer with a protruding wall portion and a second electrode mixture layer with a thin portion and higher density wall portions to manage electrolyte solution distribution, ensuring it is stored and quickly supplied during expansion and contraction, thereby preventing liquid shortage and output decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode mixture layer area is increased to achieve higher capacity, then the capacity increases, but the electrolyte solution becomes difficult to return to the center portion during high-rate charging and discharging, causing liquid shortage
Solution Approach 1:
The electrode mixture layer is divided into a center portion and a peripheral portion, with the peripheral portion having a larger cross-sectional area. This segmentation allows the electrolyte solution to be preferentially supplied to the peripheral portion where it is needed during high-rate charging and discharging, while the center portion maintains sufficient liquid supply through the expanded peripheral reservoir.
Solution Approach 2:
The invention introduces a depth dimension by creating a protruding peripheral portion that extends toward the electrolyte solution reservoir. This dimensional change provides an additional volume for electrolyte storage at the periphery, enabling faster liquid supply to areas experiencing greater extrusion force during high-rate operation.
2Quantity of substance
If the electrode mixture layer area is increased to achieve higher capacity, then the capacity increases, but the output decreases due to liquid shortage during high-rate charging and discharging
Solution Approach 1:
By segmenting the electrode mixture layer into center and peripheral portions with different cross-sectional areas, the invention enables differentiated electrolyte supply. The peripheral portion's larger area provides enhanced electrolyte reservoir capacity, ensuring sufficient liquid supply during high-rate charging and discharging, thereby maintaining high output while supporting increased overall capacity.
Solution Approach 2:
The peripheral portion is given different structural properties (larger cross-sectional area) compared to the center portion. This local quality change concentrates electrolyte storage capacity where it is most needed during high-rate operation, allowing the electrode mixture layer to operate at high rates without liquid shortage, thus preserving output while enabling higher capacity.
3Ease of manufacture
If the electrode mixture layer uses uniform thickness, then the manufacturing is simple, but the electrolyte solution distribution becomes uneven during high-rate charging and discharging
Solution Approach 1:
The electrode mixture layer features a peripheral portion with a larger cross-sectional area than the center portion. This local structural variation improves electrolyte distribution during high-rate charging and discharging by providing enhanced liquid reservoir capacity at the periphery, while the overall layer can still be manufactured using conventional uniform coating techniques followed by selective removal or differential formation.
Solution Approach 2:
The electrode mixture layer is segmented into regions with different cross-sectional areas. This segmentation can be achieved through manufacturing processes such as selective slurry application, differential drying, or post-forming, allowing non-uniform thickness while maintaining manufacturing feasibility. The segmented structure ensures better electrolyte distribution during high-rate operation.
Data Source
AI summary
A power storage cell using an electrolyte solution, wherein the power storage cell includes a first electrode mixture layer, a separator, and a second electrode mixture layer opposed to the first electrode mixture layer with the separator interposed therebetween, wherein a coating area of at least one of the first electrode mixture layer and the second electrode mixture layer is equal to or larger than 600 cm2, the first electrode mixture layer includes a first general portion and a first wall portion surrounding the periphery of the first general portion, the first wall portion is provided so as to protrude toward the second electrode mixture layer side from the first general portion, and the second electrode mixture layer includes a second general portion and a thin portion formed to be thinner than the second general portion.