Laminated Battery Cell Layout for Compact Lead Connection
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Solution Overview
Problem
Conventional laminated batteries face challenges in enhancing reliability and battery capacity density, with existing designs often leading to increased size and risk of short circuits due to the arrangement of electrode collectors and solid electrolyte layers.
Innovation Solution
The laminated battery design features a structure where adjacent battery cells have inclined side surfaces, allowing for an exposed surface on one cell to connect the current collecting lead without increasing the laminating direction size, thereby reducing the risk of short circuits and improving capacity density by optimizing the arrangement of positive and negative electrode collectors and solid electrolyte layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collecting lead is connected to the battery cells in conventional laminated batteries, then electrical connection is achieved, but the size in the laminating direction increases and the risk of short circuits increases
Solution Approach 1:
The patent connects the current collecting lead to the exposed surface of the battery cell rather than extending it in the laminating direction. This dimensional change allows electrical connection without increasing the length in the laminating direction, thereby maintaining compact size while enabling proper current collection
Solution Approach 2:
The patent introduces an exposed surface on the battery cell that is asymmetric in nature - a surface that is not covered by the solid electrolyte layer and is accessible for lead connection. This asymmetric design allows the lead to be connected without extending through the laminating direction, preventing short circuits while maintaining compact dimensions
2Quantity of substance
If the battery capacity density is increased in conventional laminated batteries, then energy storage improves, but the reliability decreases due to increased short circuit risk
Solution Approach 1:
The patent designs the battery cell structure in advance with an exposed surface that is specifically prepared for lead connection. This preliminary design ensures that when leads are connected, they connect to a predetermined safe location without risking short circuits, even as battery capacity density increases through optimized electrode arrangements
3Ease of operation
If the electrode collectors and solid electrolyte layers are arranged in conventional laminated batteries, then battery structure is formed, but the current collecting lead connection increases size and creates short circuit risks
Solution Approach 1:
The patent extracts the lead connection function from the internal laminated structure and relocates it to the exposed surface. By taking out the connection point from the constrained laminating direction and placing it on the accessible exposed surface, the patent enables easy lead connection without increasing the size in the laminating direction
Data Source
AI summary
A laminated battery includes battery cells which are laminated and a current collecting lead. Each of the battery cells has a structure in which a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector are laminated in this order. The battery cells include first and second battery cells adjacent to each other. At least the second battery cell has a side surface inclined with respect to a laminating direction of the battery cells. The first battery cell has a surface facing the second battery cell and including an exposed surface not in contact with the second battery cell. At least part of the exposed surface overlaps at least part of the side surface of the second battery cell viewed from the laminating direction. The current collecting lead is connected to the exposed surface.