Flexible Battery Glue Frame Protrusion for Dendrite Prevention
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Solution Overview
Problem
Conventional flexible lithium batteries face issues with lithium dendrite formation and inner shorts due to the mismatched horizontal areas of positive and negative active material layers, which can lead to lithium ion deposition and structural deformation, particularly when bent.
Innovation Solution
A battery structure featuring a first glue frame with a protruding part that covers exposed active material and current collector layers, maintaining the A/C ratio and isolating the active material layers to prevent lithium dendrite formation and structural deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the horizontal area of the positive active material layer is kept smaller than the negative active material layer, then lithium ion deposition and dendrite formation are avoided, but the A/C ratio control becomes difficult and inner short risk increases
Solution Approach 1:
The protruding part of the glue frame acts as an intermediary structure that physically covers the exposed positive active material layer, preventing direct contact between lithium ions and the positive electrode while maintaining proper A/C ratio. This mediator structure simplifies the design by providing a clear physical boundary rather than relying solely on precise area matching.
2Volume of moving object
If the spacer layer horizontal area is smaller than the positive active material layer, then the battery structure is more compact, but the exposed positive active material layer becomes vulnerable to deformation and rupture when bent
Solution Approach 1:
The protruding part of the glue frame is designed in advance to extend to the edge of the spacer layer, providing preliminary protection to the exposed positive active material layer before any deformation occurs. This pre-positioned structural reinforcement prevents edge deformation and rupture during battery bending.
3Ease of manufacture
If conventional protective solutions rely only on process control of horizontal areas, then manufacturing simplicity is maintained, but protection against lithium dendrite and inner short is insufficient
Solution Approach 1:
The protection strategy is segmented into multiple functional components: the spacer layer provides initial isolation, while the protruding part of the glue frame provides additional coverage and structural support. This segmentation allows each component to perform its specific function, improving overall reliability without significantly complicating manufacturing.
Data Source
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AI summary
A battery having a protective isolation structure is disclosed comprising a first current collecting layer, a first active material layer, a spacer layer, a first glue frame, a second active material and a second current collecting layer. The first active material layer is disposed on the first current collecting layer. The spacer layer is disposed on the first active material layer. The area of the spacer layer is smaller than the area of the first active material layer so that a part of the first active material layer is exposed outside the spacer layer. The first glue frame is covering the top surface of the first active material layer exposed from the spacer layer and has a protrusion disposed on the surface of the spacer layer. The second active material layer is disposed on the surface of the spacer layer and the protrusion. The second current collecting layer is disposed on the second active material layer.