All-solid-state Battery Connection Overlap for Volume Density
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Solution Overview
Problem
The existing all-solid-state thin-film batteries face a challenge in increasing volume energy density due to the influence of conductive agent thickness between connection portions, which results in reduced battery volume efficiency.
Innovation Solution
The battery design incorporates a structure where connection portions adjacent to each other in the stacking direction are set to have specific overlapping configurations, reducing the thickness of the conductive agent and ensuring the terminal portion's thickness is equal to or less than the battery main body portion, thereby enhancing volume energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection portions are connected by a conductive agent, then electrical connection between unit batteries is achieved, but the conductive agent thickness increases the overall battery volume, reducing volume energy density
Solution Approach 1:
The connection portions of adjacent unit batteries are merged by making them overlap with each other in the stacking direction. This eliminates the need for a conductive agent between the connection portions, as the battery element portions themselves serve as the connection medium. The overlapping configuration directly reduces the volume occupied by connection structures while maintaining electrical connectivity through the inherent conductivity of the battery elements.
Solution Approach 2:
The conductive agent, which was previously necessary for connecting connection portions, is extracted or eliminated from the battery structure. By designing the connection portions to overlap directly, the patent removes the conductive agent layer that was adding unnecessary volume, thereby increasing volume energy density while preserving electrical connection functionality through the battery elements themselves.
2Reliability
If connection portions extend from all sides of battery element portions, then connectivity is maximized, but the terminal portion thickness exceeds the battery main body portion thickness, reducing volume efficiency
Solution Approach 1:
The connection portions are designed with asymmetric extension, extending only from a specific side of the battery element portions rather than uniformly from all sides. This asymmetric configuration allows the terminal portion thickness to be controlled and kept equal to or less than the battery main body portion thickness, optimizing the overall shape and volume efficiency while maintaining sufficient connection stability through the overlapping arrangement of connection portions.
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
This configuration effectively increases the volume energy density of the all-solid-state thin-film battery by minimizing conductive agent thickness and improving connection stability between the connection portions.
Implementation Method 1
a plurality of connection portions extended in the same direction from each of the plurality of battery element portions are conducted to each other via a conductive agent provided between the connection portions
Data Source
AI summary
A battery includes a plurality of unit batteries arranged in a stacking direction, each unit battery including a battery element portion and at least one connection portion extending from a side of the battery element portion. A plurality of the connection portions extend from a first side of the unit batteries, and a distance in the stacking direction between at least two of said connection portions decreases as said connection portions extend away from the sides of the respective battery element portions.