Extended Electrode Plate Layout for Higher Battery Capacity
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Solution Overview
Problem
Existing secondary batteries face challenges in increasing the capacity of positive electrode plates without exceeding the size of negative electrode plates, leading to potential separator damage and short circuits.
Innovation Solution
The electrode plate design includes a standard sheet with an extended sheet and a tab, featuring a recess and residual uncoated portion to increase the active material layer area, allowing for a larger capacity without altering the negative electrode plate size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of the positive electrode plate is increased to enhance battery capacity, then the battery capacity is improved, but the negative electrode plate size must be increased accordingly which may cause separator damage and short circuits
Solution Approach 1:
The positive electrode plate is segmented into three distinct regions: a standard sheet region with active material, an extended sheet region with active material, and a tab region without active material. This segmentation allows the positive electrode plate to have a larger overall area for increased capacity while maintaining proper separation from the negative electrode plate, preventing separator damage.
Solution Approach 2:
Different regions of the positive electrode plate have different functional qualities: the standard sheet and extended sheet regions contain active material for electrochemical reactions, while the tab region is free of active material to serve as an electrical connection point. This local differentiation enables the plate to achieve larger size for increased capacity without compromising reliability at critical interfaces.
2Quantity of substance
If the active material layer area is increased to improve electrode plate capacity, then the capacity is enhanced, but the overall electrode plate structure becomes more complex
Solution Approach 1:
The standard sheet and extended sheet are merged into a single positive electrode plate structure, where the extended sheet is a continuous extension of the standard sheet. This merging approach increases the active material area while maintaining a relatively simple monolithic structure, avoiding the need for separate components or complex assembly processes.
Solution Approach 2:
The extension is achieved in the planar dimension by extending the sheet in a specific direction, rather than increasing thickness or creating three-dimensional structures. This dimensional approach increases active material area while keeping the overall structure simple and manufacturable.
Data Source
AI summary
An electrode plate for a secondary battery, comprising: a standard sheet configured to include a standard substrate coated with an active material, the standard substrate comprising a base end and a standard end spaced apart from the base end by a standard width in a first direction; an extended sheet configured to comprise an extended substrate coated with the active material, the extended substrate comprising an extended end extended from the standard end by an extended width in the first direction; and a tab connected to the extended substrate to extend in the first direction, wherein at least one recess is provided to be spaced apart from the tab by a gap distance in a second direction perpendicular to the first direction and to expose the standard end.