Stacked Parallel Solid-State Battery Layout for Short-Circuit Isolation
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Solution Overview
Problem
Conventional batteries face challenges in enhancing performance, including short circuits, overcharging, and uneven energy distribution due to differences in cell capacity, which affect reliability and energy density.
Innovation Solution
A battery design featuring parallel-connected battery cells with insulating members and terminal electrodes, where the order of electrode and counter-electrode layers is alternately reversed, and insulating layers cover the sides to prevent short circuits and ensure balanced charging, allowing for stable stacking and increased energy density.
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 short circuits between cells may occur reducing reliability
Solution Approach 1:
The battery is divided into multiple independent battery cells (first battery cell, second battery cell, etc.), each with its own electrode layers and electrolyte. This segmentation allows parallel connection to increase capacity while maintaining individual cell independence, reducing the risk of short circuits spreading between cells.
Solution Approach 2:
Insulating members are introduced as intermediary elements between adjacent battery cells, specifically covering the electrode layers at the side surfaces. These insulating members prevent direct contact between electrode layers of different cells, thereby preventing short circuits while allowing the cells to be closely packed for parallel connection.
2Volume of stationary object
If battery cells are stacked closely to increase energy density, then volume efficiency improves, but short circuits between adjacent cells may occur
Solution Approach 1:
Insulating members are selectively applied only to specific locations where short circuit risks exist - namely the side surfaces where electrode layers are exposed. The insulating members cover only the necessary areas (electrode layers) rather than the entire cell, allowing close stacking while maintaining isolation where needed.
Solution Approach 2:
The insulating members are positioned in the lateral dimension (side surfaces) rather than only in the stacking direction. This allows battery cells to be stacked closely in the vertical direction while maintaining horizontal isolation through the side-surface insulating members, effectively utilizing three-dimensional space.
3Power
If terminal electrodes are enlarged to improve contact area, then electrical connection improves, but risk of short circuits between terminals increases
Solution Approach 1:
Insulating members are positioned between the terminal electrodes of adjacent battery cells, covering the electrode layers that would otherwise be in direct contact with the terminals. This intermediary insulation allows the terminal electrodes to be enlarged for better electrical connection while preventing short circuits between adjacent cell terminals.
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 electrically connected in parallel and stacked; an insulating member covering an electrode layer at a side surface of the power generation element; and a terminal electrode covering the side surface and the insulating member, and electrically connected to a counter-electrode layer, in which the power generation element includes: a first parallel unit that includes first battery cells and has both ends in a stacking direction at each of which a counter-electrode layer is located; and a second parallel unit that includes second battery cells, has both ends in the stacking direction at each of which an electrode layers is located, and is stacked on the first parallel unit.