Energy Storage Device Electrode Bundle Asymmetry
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Solution Overview
Problem
Conventional energy storage devices with bent end portions in the electrodes are prone to short circuits due to the bending of current collecting substrates, which can lead to manufacturing inefficiencies and reduced reliability.
Innovation Solution
The energy storage device is configured with a sheet-like electrode assembly where the current collecting substrates of one electrode are bent towards one side, and the extension portions of the other electrode are bundled in a way that the bundle portion is shifted from the center, preventing the substrates from approaching each other and thus suppressing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current collecting substrate is bent at the end portion to improve manufacturing efficiency, then productivity is improved, but the risk of short circuit between electrodes increases
Solution Approach 1:
The bundle portion is intentionally positioned asymmetrically, shifted from the center in the layered direction toward one electrode. This asymmetric positioning ensures that even when the current collecting substrate is bent, the bundled extension portion maintains adequate spacing from the bent end portion, preventing short circuits while preserving manufacturing efficiency
Solution Approach 2:
The solution addresses the short circuit risk by utilizing the layered direction (thickness direction) dimension. By shifting the bundle portion's position in the layered direction from the center, the invention creates sufficient clearance in the dimension where bending occurs, effectively preventing contact between electrodes during charge-discharge cycles
2Stability of the object's composition
If the bundle portion is positioned at the center in the layered direction, then structural symmetry is maintained, but the risk of short circuit increases when substrates are bent
Solution Approach 1:
The invention deliberately introduces asymmetry by shifting the bundle portion from the centered position in the layered direction. This asymmetric configuration prioritizes reliability over symmetry, ensuring that the extension portion with bundled substrates maintains safe distance from the bent end portion, thereby preventing short circuits
3Reliability
If the extension portion is made long to ensure adequate spacing, then short circuit prevention is improved, but device volume increases
Solution Approach 1:
Instead of increasing the extension portion length in the width direction, the invention utilizes the layered direction (thickness direction) by shifting the bundle portion's position. This dimensional approach achieves effective spacing for short circuit prevention without proportionally increasing the overall device volume
Solution Approach 2:
The invention changes the positional parameter of the bundle portion in the layered direction from centered to shifted. This parameter change optimizes the spacing between the extension portion and bent end portion, achieving short circuit prevention with minimal impact on device dimensions
Data Source
AI summary
An energy storage device includes an electrode assembly that includes a sheet-like first electrode and a sheet-like second electrode, the first electrode and the second electrode being alternately layered. Each of the first electrode and the second electrode includes a sheet-like current collecting substrate, and the current collecting substrate of the first electrode is bent toward one side in a layered direction in at least a part of an end portion of the first electrode. The electrode assembly also includes an extension portion formed in such a manner that the current collecting substrate of the second electrode extends outward more than the end portion of the first electrode.