Solid Electrolyte Laminate for Bipolar Battery Short-Circuit Prevention
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Solution Overview
Problem
Bipolar batteries face issues of short circuits due to misalignment of electrode active material layers, which are addressed by inserting insulators, complicating the manufacturing process and increasing weight.
Innovation Solution
A self-supporting laminate structure using a solid electrolyte sheet with active material layers formed on its surfaces, preventing short circuits by allowing electrode layers to be freely positioned, thus simplifying the battery structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulator is inserted between current collectors to prevent short circuits, then short circuit prevention is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent removes the insulator component entirely from the battery structure. Instead of adding an insulator between current collectors, the invention uses a solid electrolyte layer that inherently prevents electrical contact between adjacent current collectors while maintaining ionic conductivity, thus eliminating the need for separate insulator components.
Solution Approach 2:
The solid electrolyte layer performs multiple functions simultaneously: it acts as both the electrolyte medium for ion transport and as an electrical insulator between adjacent current collectors. This multi-functionality eliminates the need for separate insulator components and simplifies the overall battery structure.
2Reliability
If an insulator is inserted between current collectors to prevent short circuits, then short circuit prevention is improved, but battery weight increases
Solution Approach 1:
The patent removes the insulator component entirely from the battery structure. Instead of adding an insulator between current collectors, the invention uses a solid electrolyte layer that inherently prevents electrical contact between adjacent current collectors while maintaining ionic conductivity, thus eliminating the need for separate insulator components.
3Power
If current collectors with higher conductivity in thickness direction are used, then electrical conductivity is improved, but material selection and manufacturing complexity increase
Solution Approach 1:
The patent removes the insulator component entirely from the battery structure. Instead of adding an insulator between current collectors, the invention uses a solid electrolyte layer that inherently prevents electrical contact between adjacent current collectors while maintaining ionic conductivity, thus eliminating the need for separate insulator components.
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 solution prevents short circuits while maintaining a simple battery design, reducing size and weight, and enhancing ion conductivity and mechanical strength.
Implementation Method 1
a solid electrolyte sheet containing a solid electrolyte
Data Source
AI summary
A battery including a self-supporting laminate structure is provided. The laminate structure includes a solid electrolyte sheet containing a solid electrolyte, a first active material layer containing a first active material on one major surface of the solid electrolyte sheet, and a second active material layer containing a second active material on the other major surface of the solid electrolyte sheet. The solid electrolyte sheet preferably has a first extending portion extending outwardly from the periphery of the first active material layer or, a second extending portion extending outwardly from the periphery of the second active material layer.