All-Solid Battery Pressing Method for Short Circuit Prevention
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Solution Overview
Problem
All-solid batteries face issues with short circuits and increased internal resistance due to deformation and contact between active material layers during charge/discharge cycles and manufacturing processes, which existing methods fail to adequately address.
Innovation Solution
A manufacturing method involving specific pressure and temperature conditions for each step of stacking and pressing in an all-solid battery, including a positive electrode laminate, an intermediate solid electrolyte layer, and a negative electrode laminate, with varying pressures and temperatures to prevent short circuits and reduce internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pressure is applied to improve contact between layers, then contact quality is improved, but active material layers collapse and cause short circuit
Solution Approach 1:
The pressing process is divided into multiple stages with different pressure levels: initial pressing at low pressure to prevent collapse, followed by intermediate pressing, and final pressing at higher pressure. This segmentation allows each stage to serve a specific function - preventing short circuit first, then improving contact quality progressively.
Solution Approach 2:
The positive electrode active material layer is preliminarily pressed before assembling the complete battery structure. This preliminary action stabilizes the layer shape and prevents collapse during subsequent assembly and pressing operations, addressing the root cause of short circuits before they can occur.
2Reliability
If repeated pressing is applied to reduce internal resistance, then contact is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple pressing operations are merged into a coordinated sequence where initial pressing, intermediate pressing, and final pressing are integrated into one continuous manufacturing flow. The pressing conditions are optimized so that cumulative effect achieves the desired contact quality without requiring excessive separate operations.
Solution Approach 2:
The pressing parameters (pressure, temperature, duration) are systematically changed across different stages. Initial pressing uses lower pressure and room temperature, while final pressing uses higher pressure and elevated temperature to enhance contact. This parameter optimization reduces the number of pressing cycles needed.
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 method effectively suppresses short circuits and reduces internal resistance by optimizing the contact and bonding between layers, enhancing the battery's performance and durability.
Implementation Method 1
pressing these layers as a whole for the purpose of improving the contact at a solid-solid interface to enhance the performance of the all-solid battery
Implementation Method 2
heat-pressing (third pressing) the laminate for battery
Data Source
AI summary
An all-solid battery having stacked therein, in order, a positive electrode laminate, an intermediate solid electrolyte layer, and a negative electrode laminate is manufactured by a first pressing step (i) of applying pressure to the positive electrode laminate, a second pressing step (ii) of applying pressure to the negative electrode laminate, and a third pressing step (iii) of applying pressure to the positive electrode laminate, the intermediate solid electrolyte layer, and the negative electrode laminate.