Magnetic Alignment of Graphite Anodes Across Slurry Thickness Variations
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Solution Overview
Problem
Existing technologies face challenges in uniformly aligning the crystal faces of carbon-based negative electrode active materials in negative electrodes, due to variations in slurry thickness and loading amounts, which affects the charging performance of secondary batteries.
Innovation Solution
A magnetic alignment device that adjusts the intensity of the magnetic field based on the thickness of the negative electrode slurry, using a control system with a database to optimize the separation distance between magnet parts, ensuring uniform alignment of the carbon-based negative electrode active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic field is applied to orient graphite in the negative electrode slurry, then the charging performance of the battery is improved, but the uniformity of graphite orientation deteriorates due to variations in slurry thickness and loading amount
Solution Approach 1:
The patent employs dynamic adjustment of the magnetic field application system by varying the separation distance between the first and second magnet parts based on the measured thickness of the negative electrode slurry. This dynamic adjustment ensures that the magnetic field intensity is optimized for each specific slurry thickness, thereby achieving uniform graphite orientation across different loading amounts and thickness variations.
Solution Approach 2:
The patent changes the physical parameter of the magnetic field application by adjusting the separation distance between magnet parts according to the slurry thickness. This parameter change allows the magnetic field intensity to be adapted to different slurry conditions, resolving the contradiction between improving charging performance and maintaining uniform graphite orientation.
2Manufacturing precision
If permanent magnets are provided in the manufacturing device to control magnetic field application, then graphite orientation can be achieved, but the device complexity increases and adaptability to different negative electrode specifications deteriorates
Solution Approach 1:
The patent reduces device complexity by implementing a simple adjustable mechanism for the magnet parts that can dynamically change the separation distance. This simple dynamic adjustment system provides adaptability to different negative electrode specifications without requiring complex control mechanisms, thereby resolving the contradiction between graphite orientation control and device complexity.
Solution Approach 2:
The patent achieves adaptability to different negative electrode specifications by changing the separation distance parameter between magnet parts based on the measured slurry thickness. This single parameter adjustment allows the same manufacturing device to handle various specifications effectively, reducing the need for multiple specialized configurations.
3Device complexity
If the separation distance between magnet parts is fixed, then the device structure is simplified, but the ability to accommodate different slurry thicknesses and loading amounts deteriorates
Solution Approach 1:
The patent implements a simple dynamic adjustment mechanism that allows the separation distance between magnet parts to be varied based on slurry thickness measurements. This dynamic capability provides versatility for different specifications while maintaining relatively simple device structure, resolving the contradiction between structural simplicity and adaptability.
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 magnetic alignment device achieves uniform high alignment of the crystal faces of the carbon-based negative electrode active material, improving lithium ion mobility and reducing resistance during charging and discharging, thereby enhancing the charging and discharging performance of secondary batteries.
Implementation Method 1
a magnetic alignment device that adjusts the intensity of the magnetic field based on the thickness of the negative electrode slurry
Data Source
AI summary
A magnetic alignment device includes a first magnet part and a second magnet part, a thickness measuring part, and a control part. The first and second magnet parts accommodate an electrode sheet therebetween and the thickness measuring part measures a thickness of a negative electrode slurry disposed on the electrode sheet. The control part adjusts the separation distance of the first and second magnet parts. The magnetic alignment device measures the thickness of the negative electrode slurry applied on the negative electrode current collector in real time and controls the intensity of the magnetic field by adjusting the separation distance of the magnet part according to the measured negative electrode slurry thickness, and has an advantage of uniformly high alignment degree of the crystal faces of the carbon-based negative electrode active material contained in prepared negative electrode active layer.