Electric Storage Device Non-Rectangular Wound Electrode Design
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Solution Overview
Problem
There is a need for electric storage devices that do not have a rectangular shape in plan view, as the conventional rectangular shape restricts their disposition in non-traditional spaces within electronic devices.
Innovation Solution
The design includes a first electrode body with a wound structure and an extension part, and a second electrode body with a different length, allowing for a non-rectangular shape in plan view. The electrode bodies can be electrically connected and have different resistance values per unit capacitance, enabling a non-rectangular form while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rectangular shape is used for the electric storage device, then the manufacturing process is simple and the structure is easy to assemble, but the device cannot be disposed in non-traditional spaces within electronic devices
Solution Approach 1:
The electrode body is divided into a wound body portion and an extension part, where the extension part protrudes from the wound body to create a non-rectangular shape. This segmentation allows the device to adapt to various spaces while maintaining the simplicity of the wound structure for the main body.
Solution Approach 2:
The electric storage device employs an asymmetric shape by extending one part of the electrode body beyond the rectangular wound body boundaries. This asymmetric design enables the device to fit into non-traditional spaces within electronic devices while preserving the manufacturing simplicity of the wound structure.
2Adaptability or versatility
If the electrode body is extended to create a non-rectangular shape, then the device can be disposed in various spaces, but the manufacturing precision and assembly difficulty increase
Solution Approach 1:
The electrode body is segmented into a standard wound body and an extension part. The wound body maintains regular geometric precision for easy manufacturing, while the extension part provides the necessary non-rectangular shape adaptation without compromising the precision of the main wound structure.
3Reliability
If a single electrode body is used, then the structure is simple, but the device cannot achieve both high capacitance and low resistance simultaneously
Solution Approach 1:
Different portions of the electrode body have different functions: the wound body portion provides the main capacitance storage, while the extension part is optimized for current collection and electrical connection. This local quality differentiation enables the device to achieve both high capacitance and low resistance simultaneously.
Solution Approach 2:
The extension part adds a dimensional extension to the traditional wound structure, creating a three-dimensional electrode body configuration that optimizes both capacitance distribution and current collection pathways, thereby achieving superior performance balance.
Data Source
AI summary
An electric storage device that includes a first electrode body and a second electrode body. The first electrode body includes a first wound body part and an extension part. The first wound body part includes a laminated body having a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The second electrode body is on the extension part. The length of the second electrode body is different from that of the first wound body part of the first electrode body in a direction in which a central axis of the first wound body part extends.