Solid-State Battery Pressing Member With Softer Edge Regions
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Solution Overview
Problem
All-solid-state batteries face challenges in preventing short circuits, particularly at the end portions, due to excessive current concentration and contact between current collectors during confinement, which increases the risk of short-circuit failure.
Innovation Solution
A battery design featuring a power generating element group with multiple laminated power generating elements and a first member having a central region and an end region with different Young's moduli, where the end region has a smaller modulus than the central region, is used to relieve pressure at the end portions, reducing current concentration and physical contact between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uniform confining pressure is applied to the all-solid-state battery, then charge-discharge characteristics are improved, but short circuit risk increases at end portions
Solution Approach 1:
The pressing member is designed with different Young's moduli for different regions: a first Young's modulus for the central region and a second Young's modulus (smaller than the first) for the end region. This allows the central region to apply sufficient pressure for good charge-discharge characteristics while the end region applies reduced pressure to prevent short circuits between current collectors.
2Reliability
If high confining pressure is applied to improve particle contact, then internal resistance reduces, but current collector contact increases causing short circuits
Solution Approach 1:
The pressing member implements spatially varying mechanical properties through different Young's moduli. The central region with higher modulus ensures adequate pressure for particle contact, while the end region with lower modulus prevents excessive pressure that would cause current collector contact and short circuits.
3Ease of manufacture
If the pressing member has uniform Young's modulus, then manufacturing is simplified, but pressure distribution is inadequate for preventing short circuits
Solution Approach 1:
The pressing member is constructed as a composite structure with regions of different materials or material densities, resulting in different Young's moduli. This composite approach enables the pressing member to provide both high pressure in the center and reduced pressure at the ends, preventing short circuits while maintaining manufacturability.
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 design effectively reduces the risk of short circuits while improving charge-discharge characteristics by maintaining satisfactory contact between particles and reducing internal resistance.
Implementation Method 1
A Young's modulus of the first end region is smaller than a Young's modulus of the first central region
Data Source
AI summary
A battery includes a power generating element group including multiple laminated power generating elements each of which contains a solid electrolyte, and a first member in contact with a principal surface of a first power generating element that is one among the multiple power generating elements. The principal surface includes a central portion and an end portion with a ring-like shape surrounding the central portion in a plan view. The first member includes a central region overlapping with the central portion of the principal surface in a plan view, and an end region overlapping with the end portion of the principal surface in a plan view. At least one of the central region or the end region is in contact with the principal surface. A Young's modulus of the end region is smaller than that of the central region.