All-Solid-State Battery Electrode Layout for Safe Pressing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
All-solid-state batteries face issues with short circuits and safety concerns due to damage of the solid electrolyte layer during pressing, especially when increasing the thickness of electrodes to achieve high-capacity and high-density batteries, leading to potential ignition or explosion risks.
Innovation Solution
The battery design involves a positive electrode with greater thickness and strength than the negative electrode, with the area facing the pressing portion being less than the area not facing it, allowing uniform pressing to prevent distortion and damage, and using a method where the pressing plate is applied to the negative electrode, ensuring the solid electrolyte layer is not damaged, even if it is thin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of electrodes is increased to achieve high-capacity and high-density batteries, then the energy density is improved, but the solid electrolyte layer is damaged during pressing causing short circuits
Solution Approach 1:
The patent applies asymmetry by making the positive electrode thicker than the negative electrode, and positioning the pressing plate to contact only the negative electrode. This asymmetric configuration ensures that the thinner negative electrode absorbs the pressing deformation, protecting the solid electrolyte layer from damage while maintaining high energy density through the thicker positive electrode
2Volume of stationary object
If the solid electrolyte layer is made thinner to improve battery density, then the volume is reduced, but the layer is more susceptible to damage during pressing
Solution Approach 1:
The patent applies beforehand cushioning by designing the positive electrode to be thicker than the negative electrode, creating a buffer zone that protects the thin solid electrolyte layer from pressing damage. The thicker positive electrode acts as a cushion that absorbs excess pressure, preventing damage to the vulnerable thin solid electrolyte layer while maintaining compact battery volume
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 reduces the risk of short circuits and improves the safety and performance of high-capacity, high-density all-solid-state batteries by maintaining the integrity of the electrode assembly and solid electrolyte layer during pressing, enhancing the initial production yield and operational safety.
Implementation Method 1
interfacial resistance is reduced by pressing a unit cell including the solid electrolyte
Data Source
AI summary
An all-solid-state battery and a method of manufacturing the same are provided. The all-solid-state battery comprises an electrode assembly which is pressed and includes a positive electrode, a negative electrode, the positive electrode being thicker than the negative electrode, and a solid electrolyte layer between the positive electrode and the negative electrode; and a battery case configured to receive the electrode assembly. When the electrode assembly is pressed, an area of an electrode that directly faces a pressing portion is less than an area of an electrode that does not directly face the pressing portion.