Elastic Interlayer Sheet for Unit Cell Alignment in Solid-State Batteries
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Solution Overview
Problem
Existing all-solid rechargeable batteries face challenges in managing stress and alignment distortion due to changes in electrode thickness during charge and discharge cycles, which can lead to reduced efficiency and lifespan.
Innovation Solution
An elastic sheet with a thickness of 100 μm to 500 μm and a strain of 10% or less in a vacuum environment of 0.1 MPa is introduced between the unit cells of the battery. The elastic sheet is composed of a polymer resin, such as polyacrylate or polyurethane, and may include hollow particles and inorganic particles to enhance compressive strength and stress relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery uses solid electrolyte and high energy density electrodes, then energy density is improved, but stress and alignment distortion occur during charge-discharge cycles
Solution Approach 1:
The patent introduces an elastic sheet between unit cells that acts as a cushioning element before stress damage occurs. The elastic sheet absorbs and distributes the stress generated during charge-discharge cycles, preventing alignment distortion and maintaining battery reliability while preserving high energy density characteristics.
Solution Approach 2:
The elastic sheet serves as an intermediary component between the unit cells, mediating the stress interactions during battery operation. It transfers and distributes mechanical stress uniformly across the battery structure, preventing direct stress concentration that would cause alignment distortion in high energy density batteries.
2Productivity
If electrode thickness changes during charge and discharge, then electrochemical performance is improved, but alignment distortion of unit cells occurs
Solution Approach 1:
The elastic sheet is positioned between unit cells to provide preemptive cushioning against the expansion and contraction forces generated during charge-discharge cycles. This cushioning effect maintains unit cell alignment while allowing the electrodes to undergo necessary thickness changes for electrochemical performance.
Solution Approach 2:
The elastic sheet's mechanical properties (elastic modulus, thickness) are specifically designed to match the stress characteristics of the battery during operation. By adjusting these parameters, the sheet effectively compensates for electrode thickness changes without causing alignment distortion, enabling both high productivity and shape stability.
3Shape
If rigid structure is used to maintain unit cell alignment, then alignment stability is improved, but stress relief capability is reduced
Solution Approach 1:
The patent employs a flexible elastic sheet instead of a rigid structure to maintain unit cell alignment. The sheet's flexibility allows it to deform elastically under stress, providing both alignment stability and stress relief capability simultaneously, unlike rigid structures that would transfer stress concentration to the electrodes.
Solution Approach 2:
The elastic modulus and thickness of the sheet are optimized to achieve the right balance between rigidity for alignment stability and flexibility for stress relief. This parameter optimization enables the sheet to maintain unit cell geometry while absorbing mechanical stress during battery cycling.
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 alleviates stress caused by changes in electrode thickness, improves Coulomb efficiency and lifespan characteristics, and suppresses alignment distortion of the unit cells, thereby enhancing the overall performance of the all-solid rechargeable battery.
Implementation Method 1
an elastic sheet for an all-solid rechargeable battery, the elastic sheet having a thickness of 100 μm to 500 μm, and a strain of 10% or less in a vacuum environment of 0.1 MPa
Implementation Method 2
The elastic sheet may include hollow particles... the hollow particles may include inorganic hollow particles, organic hollow particles, or a combination thereof
Data Source
AI summary
An elastic sheet for an all-solid rechargeable battery and an all-solid rechargeable battery that includes the elastic sheet for an all-solid rechargeable battery, the elastic sheet having a thickness of 100 μm to 500 μm, and a strain of 10% or less in a vacuum environment of 0.1 MPa.