Stacked Solid-State Battery Side Insulation for Parallel Cells
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Solution Overview
Problem
Conventional batteries face challenges in enhancing battery properties such as preventing short circuits, ensuring reliable electrical connections, and improving energy density, while maintaining cost-effectiveness and reliability.
Innovation Solution
A battery design featuring a power generation element with stacked battery cells, including electrode and counter-electrode layers with a solid electrolyte, and insulating members covering specific surfaces to prevent short circuits and enhance adhesion, along with terminal electrodes for secure electrical connections, and outer current collectors for improved energy density and high current characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery cells are connected in parallel to increase capacity, then energy density improves, but the risk of short circuits between electrode layers increases
Solution Approach 1:
An insulating member is introduced as an intermediary between the electrode layer and counter-electrode layer at the battery cell side surface. This insulating member prevents direct contact and potential short circuits between the electrode and counter-electrode layers while allowing the battery cells to be connected in parallel for increased capacity.
Solution Approach 2:
The insulating member extends in the stacking direction (thickness direction) of the battery cell, covering from the electrode layer through the solid electrolyte layer to part of the counter-electrode layer. This three-dimensional coverage approach prevents short circuits by creating an insulating barrier across the critical interface region.
2Reliability
If insulating members are added to prevent short circuits, then reliability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The insulating member serves multiple functions simultaneously: it provides electrical insulation between the electrode and counter-electrode layers to prevent short circuits, and it also serves as an adhesive layer that enhances bonding between the battery cell components. This multi-functionality reduces the need for separate insulating and adhesive components, thereby simplifying the overall structure.
3Reliability
If insulating members cover larger areas to ensure complete coverage, then short circuit prevention improves, but material usage and cost increase
Solution Approach 1:
The insulating member is positioned strategically to cover the critical region where the electrode layer and counter-electrode layer are most susceptible to short circuits. Specifically, it covers from the electrode layer through the solid electrolyte layer to part of the counter-electrode layer at the side surface, providing targeted insulation where it is most needed rather than uniform coverage throughout the entire battery cell.
Data Source
AI summary
A battery includes: a power generation element including 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, and which are stacked; an electrode insulating layer covering an electrode layer among the electrode layers at a side surface of the power generation element; and a counter-electrode terminal covering the side surface and the electrode insulating layer, and electrically connected to a counter-electrode layer among the counter-electrode layers. At least some of the battery cells are connected in parallel. At the side surface, the electrode insulating layer covers from an electrode layer among the electrode layers to a part of a corresponding one of the counter-electrode layers along a stacking direction of the power generation element.