Columnar All-Solid-State Battery Layout for Crack Resistance
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Solution Overview
Problem
All-solid-state batteries face challenges with structural stability and mechanical strength due to stress from sintering contraction, which affects their reliability during charging and discharging cycles.
Innovation Solution
The design includes a columnar battery cell with sequentially stacked positive electrode active material, solid electrolyte layer, negative active material, and negative electrode support, along with connection members and terminals, and a groove portion to distribute stress uniformly, enhancing mechanical strength and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a ceramic-based solid electrolyte is used in the battery, then stability is improved, but mechanical strength deteriorates due to stress from sintering contraction and repeated expansion during charging and discharging
Solution Approach 1:
The battery is divided into multiple battery cells (first battery cell, second battery cell, etc.) arranged in parallel. Each cell is independently structured with its own electrode assembly and solid electrolyte, allowing stress to be distributed across multiple units rather than concentrated in a single large structure. This segmentation prevents crack propagation across the entire battery and maintains mechanical strength while preserving the stability benefits of ceramic-based solid electrolytes.
Solution Approach 2:
Connection members are strategically positioned at specific locations (both surfaces of the battery cell in the third direction) to provide localized reinforcement and stress distribution. The groove portions are formed at specific positions to redirect and distribute stress uniformly across the battery structure. These localized structural features address stress concentration points without compromising the overall stability provided by the ceramic-based solid electrolyte.
2Strength
If multiple battery cells are arranged in parallel with connection members, then mechanical strength is improved, but device complexity increases
Solution Approach 1:
Multiple battery cells are merged into a single integrated battery structure through connection members that electrically and mechanically connect the cells. The parallel arrangement of cells sharing common terminals and structural support creates a unified battery assembly that achieves enhanced mechanical strength while maintaining relatively simple manufacturing and assembly processes. The connection members serve dual functions of electrical connection and mechanical reinforcement.
Solution Approach 2:
The connection members perform multiple functions simultaneously: they provide electrical connection between battery cells, serve as mechanical reinforcement elements, and act as structural support components. The groove portions also serve multiple purposes by both distributing stress and providing structural definition. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity while achieving improved mechanical strength.
Data Source
AI summary
An all-solid-state battery includes: a columnar battery cell, having a central axis extending in a first direction, in which a positive electrode active material, a positive electrode support, a solid electrolyte layer, a negative active material, and a negative electrode support are sequentially stacked from a center of the battery cell; a plurality of connection members disposed on both surfaces of the battery cell in a third direction; a negative electrode terminal connected to the connection members; and a positive electrode terminal connected to the connection members. The all-solid-state battery includes a groove portion disposed in the third direction of the battery cell and disposed in the first direction, and includes at least two battery cells.