Elastic Sheet Structure for Shock-Resistant Solid-State Batteries
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Solution Overview
Problem
Existing all-solid-state batteries lack effective solutions for enhancing safety against external shocks, which can lead to internal short circuits and other safety issues.
Innovation Solution
An elastic sheet is introduced, comprising a plate-shaped polymer with an aspect ratio of about 1 to 5 and a thickness of about 0.2 μm to 4 μm, combined with a binder and optionally a flame-retardant ceramic. This elastic sheet is positioned outside at least one of the positive or negative electrodes, serving as a buffer to absorb external pressures and prevent internal short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid structure is used to protect against external shocks, then safety is improved, but stress concentration on the solid electrolyte increases causing internal short circuits
Solution Approach 1:
The patent employs an elastic sheet comprising a plate-shaped polymer as a flexible protective layer outside the electrodes. This elastic sheet absorbs external shock forces through its elastic properties, preventing direct transmission of stress to the solid electrolyte and avoiding internal short circuits while maintaining battery safety.
Solution Approach 2:
The elastic sheet is positioned in advance outside the electrodes to provide cushioning protection before external shocks occur. It serves as a pre-positioned buffer that absorbs and dissipates impact energy, protecting the internal components including the solid electrolyte from sudden external forces.
2Reliability
If the elastic sheet thickness is increased to improve shock absorption, then safety is improved, but the battery volume increases
Solution Approach 1:
The patent optimizes the thickness parameter of the elastic sheet to a specific range (0.2-4 μm) to achieve the desired shock absorption capability while minimizing volume increase. By carefully controlling this dimensional parameter, the invention balances protective function with compact battery design.
Solution Approach 2:
The elastic sheet is formed as a composite material system comprising a plate-shaped polymer combined with a binder, and optionally a flame-retardant ceramic. This composite structure provides enhanced mechanical properties and shock absorption efficiency per unit thickness, allowing effective protection with minimal volume addition.
3Stability of the object's composition
If a plate-shaped polymer with specific aspect ratio is used to uniformly transfer pressure, then stress distribution is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies an aspect ratio range (1-5) for the plate-shaped polymer to optimize pressure distribution characteristics. By defining this parameter within a practical range rather than a single value, the invention achieves good pressure uniformity while accommodating normal manufacturing variations.
Solution Approach 2:
The combination of plate-shaped polymer with binder and optional flame-retardant ceramic creates a composite material that maintains structural integrity and pressure distribution properties even with variations in individual particle dimensions, reducing the impact of manufacturing precision limitations.
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
The elastic sheet effectively transfers pressure uniformly to the electrode assembly, reduces stress on the solid electrolyte, and acts as a buffer against changes in electrode thickness during charging and discharging, thereby enhancing the safety and performance of the all-solid-state battery.
Implementation Method 1
an elastic sheet is introduced, comprising a plate-shaped polymer with an aspect ratio of about 1 to 5 and a thickness of about 0.2 μm to 4 μm... serving as a buffer to absorb external pressures
Implementation Method 2
The elastic sheet may further include a flame-retardant ceramic. The flame-retardant ceramic includes aluminum hydroxide, boehmite, pseudoboehmite, magnesium hydroxide, or a combination thereof
Data Source
AI summary
Disclosed are an elastic sheet for an all-solid-state battery and an all-solid-state battery including the same. The elastic sheet includes a plate-shaped polymer with an aspect ratio of about 1 to about 5 and a thickness of about 0.2 μm to about 4 μm; and a binder. The all-solid-state battery includes a positive electrode, a negative electrode, a solid electrolyte layer between the positive electrode and the negative electrode, and an elastic sheet. The elastic sheet includes a plate-shaped polymer with an aspect ratio of about 1 to about 5 and a thickness of about 0.2 μm to about 4 μm, and a binder, positioned on outside of at least one of the positive electrode and the negative electrode.