Solid-State Battery Stack Interlayers for Short-Circuit Isolation
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Solution Overview
Problem
There is a need for further improvement in the performance of conventional batteries, particularly in terms of reliability and efficiency, to prevent short circuits, overcharging, and over-discharging, while enhancing energy density and heat dissipation.
Innovation Solution
A battery design featuring multiple battery cells connected in parallel with a solid electrolyte layer, an interlayer between cells, and insulating and terminal electrodes that cover the electrode and counter-electrode layers, reducing the risk of short circuits and allowing for efficient heat dissipation through voids and improved electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple battery cells are connected in parallel to increase capacity, then energy density is improved, but the risk of short circuits between adjacent cells increases
Solution Approach 1:
An insulating member is introduced as an intermediary component between adjacent battery cells. This insulating member includes a first insulating portion that contacts the electrode layer and a second insulating portion that contacts the counter-electrode layer, physically separating the cells and preventing direct electrical contact while allowing the parallel connection configuration to maintain high capacity.
Solution Approach 2:
The battery pack is segmented into multiple independently isolated battery cell units. Each cell is electrically isolated from its neighbors through the insulating member, allowing individual cells to be connected in parallel for increased capacity while maintaining reliable electrical separation to prevent short circuits between cells.
2Quantity of substance
If battery cells are stacked closely to improve energy density, then volume efficiency is improved, but heat dissipation becomes difficult
Solution Approach 1:
The insulating member is designed with differentiated local properties: the first insulating portion has different thermal and electrical characteristics from the second insulating portion. This allows optimized heat dissipation pathways while maintaining electrical insulation, enabling close stacking of cells for high energy density without compromising thermal management.
3Reliability
If terminal electrodes are extended to cover insulating members for electrical connection, then electrical connectivity is improved, but the complexity of assembly increases
Solution Approach 1:
The terminal electrode serves multiple functions simultaneously: it provides electrical connection to the battery cell and extends to cover portions of the insulating member. This multi-functionality simplifies the overall assembly process by combining connection and insulation coverage into a single component rather than requiring separate elements.
Data Source
AI summary
A battery includes: a power generation element including a plurality of battery cells each of which includes an electrode layer, a counter-electrode layer, and a solid electrolyte layer located between the electrode layer and the counter-electrode layer, the plurality of battery cells being electrically connected in parallel and stacked; an interlayer located between a pair of two adjacent battery cells; an electrode insulating layer covering an electrode layer among the electrode layers at a first side surface of the power generation element; and a counter-electrode terminal covering the first side surface and the electrode insulating layer, and electrically connected to a counter-electrode layer among the counter-electrode layers.