Flexible Power Storage Cell Structure With Curved Sealed Periphery
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Solution Overview
Problem
Current power storage devices lack flexibility and high capacity, making them unsuitable for wearable devices that require comfortable, curved shapes and reduced charging frequency.
Innovation Solution
A power storage device design featuring a positive electrode, negative electrode, and electrolyte with a thermocompression-bonded exterior body, allowing for circular or approximately circular peripheries and preventing stress concentration, enabling flexibility and high capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional power storage device structures are used, then manufacturing and assembly are straightforward, but flexibility and bendability are insufficient for wearable devices
Solution Approach 1:
The power storage device is divided into multiple layers including positive electrode, negative electrode, separator, and exterior body, with each layer independently designed to contribute to overall flexibility. The exterior body is further segmented into bonding regions and non-bonding regions to enable controlled bending behavior
Solution Approach 2:
The exterior body is constructed as a thin, flexible film structure that can be thermocompression-bonded to secure electrodes while maintaining overall flexibility. The film structure allows the device to be bent without breaking, enabling wearable applications
2Reliability
If linear periphery shapes are used in power storage devices, then manufacturing is simpler, but stress concentration occurs at corners reducing reliability
Solution Approach 1:
The power storage device employs a circular or substantially circular periphery shape instead of linear/angular designs. This curved configuration eliminates corner stress concentration points, distributing mechanical stress uniformly around the perimeter and significantly improving reliability during bending and deformation
3Productivity
If low capacity power storage devices are used, then device size and weight are reduced, but charging frequency increases reducing user convenience
Solution Approach 1:
The device employs a nested layered structure where positive and negative electrodes are stacked alternately with separators between them. This vertical stacking arrangement maximizes energy capacity within a compact footprint, providing high capacity without proportionally increasing device volume or material consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances the flexibility and reliability of power storage devices, allowing them to be bent in any direction without breaking, while maintaining high capacity and reducing the frequency of charging.
Implementation Method 1
The exterior body includes a film and a thermocompression-bonded region
Data Source
AI summary
To improve the flexibility of a power storage device, or provide a high-capacity power storage device. The power storage device includes a positive electrode, a negative electrode, an exterior body, and an electrolyte. The outer periphery of each of the positive electrode active material layer and the negative electrode active material layer is a closed curve. The exterior body includes a film and a thermocompression-bonded region. The inner periphery of the thermocompression-bonded region is a closed curve. The electrolyte, the positive electrode active material layer, and the negative electrode active material layer are in a region surrounded by the thermocompression-bonded region.