Solid-State Battery Elastic Edge Structure for Crack-Resistant Assembly
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Solution Overview
Problem
The manufacturing process of all solid-state batteries often results in damage, such as cracking, of the solid electrolyte layer due to applied forces during assembly.
Innovation Solution
Incorporating elastic members with elastic moduli matching or less than the active material layers, these members cover the periphery of the positive and negative electrode active material layers, thereby reducing the local force applied to the solid electrolyte layer during manufacturing, specifically the first elastic member between the positive electrode current collector and the solid electrolyte layer, and the second elastic member between the negative electrode current collector and the solid electrolyte layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If force is applied during assembly to ensure contact between layers, then good electrical contact and layer adhesion are achieved, but cracking and damage to the solid electrolyte layer occur
Solution Approach 1:
An elastic member is introduced as an intermediary between the positive electrode current collector and the solid electrolyte layer. This elastic member has an elastic modulus lower than that of the solid electrolyte layer, allowing it to deform preferentially under applied force during assembly, thereby protecting the solid electrolyte layer from cracking while still ensuring good electrical contact and adhesion.
Solution Approach 2:
The elastic modulus of the elastic member is specifically designed to be lower than that of the solid electrolyte layer. This parameter change allows the elastic member to serve as a stress-absorbing layer that deforms under load, preventing force transmission to the brittle solid electrolyte layer while maintaining effective contact during assembly operations.
2Manufacturing precision
If rigid structure is used to maintain layer alignment, then precise positioning is achieved, but stress concentration and damage to solid electrolyte layer occur
Solution Approach 1:
The elastic member functions as a flexible thin film structure that can deform to accommodate manufacturing tolerances and maintain layer alignment without transmitting damaging stresses to the solid electrolyte layer. Its flexibility allows it to conform to slight variations in layer positioning while protecting the brittle electrolyte from crack initiation.
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 minimizes damage to the solid electrolyte layer during manufacturing by distributing pressure and reducing bending stress, thereby enhancing the reliability and performance of the all solid-state battery.
Implementation Method 1
a first elastic member covering a periphery of the positive electrode active material layer and having an elastic modulus less than or equal to an elastic modulus of the positive electrode active material layer
Data Source
AI summary
An all solid-state battery and a method for manufacturing all solid-state battery that are capable of reducing damage during the manufacturing process include: a positive electrode current collector; a positive electrode active material layer provided on a surface of the positive electrode current collector; a first elastic member covering a periphery of the positive electrode active material layer and having an elastic modulus less than or equal to an elastic modulus of the positive electrode active material layer; a solid electrolyte layer facing the positive electrode current collector with the first elastic member and the positive electrode active material layer in between; a negative electrode current collector facing the positive electrode current collector with the solid electrolyte layer in between; and a negative electrode active material layer provided between the negative electrode current collector and the solid electrolyte layer and disposed inside a periphery of the solid electrolyte layer.