All-solid-state battery electrode roller pressing
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Solution Overview
Problem
The existing manufacturing processes for all-solid-state batteries often result in cracks during the preparation of electrodes and solid electrolytes due to the pressing mechanism, which affects the battery's performance and porosity.
Innovation Solution
An apparatus comprising multiple roller members with varying diameters and positions, along with a guide belt and heat supply system, is used to press and shape the electrodes and solid electrolytes, ensuring uniform pressure and heat distribution to prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rolling method using rollers is used to prepare an electrode or solid electrolyte, then the manufacturing process is simple and efficient, but cracks are generated in the electrode or solid electrolyte
Solution Approach 1:
The pressing operation is divided into multiple stages using a plurality of roller members (first roller members and second roller members) arranged in sequence. Each roller member applies pressure progressively, avoiding the single-step heavy pressing that causes cracks. This segmentation of the pressing process allows the electrode or solid electrolyte to be compressed gradually without generating harmful stress concentrations.
Solution Approach 2:
Different roller members are configured with different diameters and pressing positions to apply localized pressure distributions. The first and second roller members are spaced apart and positioned at opposite locations, creating a controlled pressure gradient across the electrode or solid electrolyte. This local quality variation in pressing force prevents uniform stress concentration that leads to cracking.
2Manufacturing precision
If multiple roller members with different diameters are used, then uniform pressure distribution is achieved, but the device complexity increases
Solution Approach 1:
The roller members are deliberately designed with different diameters and asymmetric arrangements. The first roller members and second roller members have different diameter specifications, and they are positioned at opposite locations with specific spacing. This asymmetric configuration creates a controlled pressure distribution pattern that ensures uniform compression across the electrode or solid electrolyte while maintaining a relatively simple overall structure.
Solution Approach 2:
The plurality of roller members serve multiple functions simultaneously: they apply pressing force, control pressure distribution, maintain spacing through guide belts, and enable gradual compression. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving uniform pressure application.
3Reliability
If the porosity is reduced to improve battery characteristics, then the battery performance improves, but a binder must be used which acts as a resistor and deteriorates battery performance
Solution Approach 1:
The invention replaces the chemical approach (using binders to reduce porosity) with a mechanical approach (controlled pressing using multiple roller members). By applying gradual, uniform pressure through the segmented rolling process, the electrode or solid electrolyte achieves reduced porosity and improved density without requiring binder materials. This substitution eliminates the harmful electrical resistance introduced by binders while still achieving the desired porosity reduction for improved battery characteristics.
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 approach effectively prevents crack formation, enhances the uniformity of pressure and heat application, thereby improving the manufacturing process and battery performance by reducing porosity and maintaining optimal battery characteristics.
Implementation Method 1
a first roller member (110) pressing an electrode or a solid electrolyte (800) for an all-solid-state battery; and a second roller member (120) spaced apart from the first roller member (110) to press the electrode or the solid electrolyte (800)
Implementation Method 2
a first heat supply member (610) connected to the first guide belt (510) or the second guide belt (520) to supply heat to the first guide belt (510) or the second guide belt (520)
Data Source
AI summary
Disclosed is an apparatus for manufacturing an electrode or a solid electrolyte for an all-solid-state battery. The apparatus for manufacturing an electrode or a solid electrolyte for an all-solid-state battery includes a first roller member configured to press an electrode or a solid electrolyte for an all-solid-state battery, and a second roller member located to be spaced apart from the first roller member to press the electrode or the solid electrolyte for an all-solid-state battery. The first roller member and the second roller member are disposed at opposite locations based on the electrode or the solid electrolyte for an all-solid-state battery.