Dual Electrode Assembly Layout for Compact High-Capacity Cells
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Solution Overview
Problem
Conventional energy storage devices with electrode assemblies and tabs face challenges in reducing size and increasing capacity due to unnecessary space generated between multiple electrode assemblies, leading to increased size or decreased capacity.
Innovation Solution
The configuration of the energy storage device includes two electrode assemblies with non-overlapping terminal end portions, allowing for efficient placement and connection of tabs to minimize space between assemblies, enabling a reduction in size and an increase in capacity by optimizing the arrangement and orientation of the electrode assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode assemblies with tabs are used to increase occupying ratio, then capacity increases, but unnecessary space is generated between assemblies
Solution Approach 1:
The patent utilizes the width dimension by extending electrode plates beyond the winding width to create terminal end portions that overlap in the width direction. This dimensional extension allows tabs from adjacent assemblies to be positioned closer together, reducing the space between assemblies while maintaining adequate tab connection areas.
Solution Approach 2:
The electrode assembly is segmented into distinct functional portions: the wound body portion and the extended terminal end portion. This segmentation allows the terminal ends to be independently positioned and configured to optimize space utilization while maintaining the integrity of the wound structure.
2Volume of moving object
If electrode assemblies are arranged closely to reduce size, then device size decreases, but tab connection becomes difficult
Solution Approach 1:
By extending plates in the width direction, the patent creates terminal end portions that overlap between adjacent assemblies. This provides sufficient lateral space for tab connection while keeping the assemblies closely spaced in the length direction, thus reducing overall device size while maintaining manufacturability.
Solution Approach 2:
The plates are pre-formed with extended terminal end portions before assembly. This preliminary configuration ensures that when assemblies are stacked, the tabs are already in optimal positions for connection, simplifying the manufacturing process despite the compact arrangement.
3Volume of moving object
If plate width is increased to provide overlapping terminal ends, then space utilization improves, but manufacturing complexity increases
Solution Approach 1:
The plate is divided into the wound portion and the extended terminal end portion. This segmentation allows the extension to be added as a separate, simple feature during winding or post-winding processing, rather than requiring complex overall plate design. The extension is a straightforward geometric addition that does not significantly complicate manufacturing.
Data Source
AI summary
An energy storage device includes: a first electrode assembly formed by winding a first plate; and a second electrode assembly formed by winding a second plate, in which the first electrode assembly includes a first positive electrode tab and a first negative electrode tab protruding from a part of a first electrode assembly body portion, the second electrode assembly includes a second positive electrode tab and a second negative electrode tab protruding from a part of a second electrode assembly body portion, the first electrode assembly body portion includes a first plate terminal end portion at a position facing the second electrode assembly body portion, the second electrode assembly body portion includes a second plate terminal end portion at a position facing the first electrode assembly body portion, and the first plate terminal end portion and the second plate terminal end portion are disposed at positions which do not overlap each other as viewed in an arrangement direction of the first electrode assembly and the second electrode assembly.