Magnetic Graphite Alignment for Uniform Battery Negative Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing negative electrodes in secondary batteries face challenges in uniformly aligning carbon-based active materials like graphite, due to variable magnetic field conditions during the manufacturing process, leading to inconsistent charging performance.
Innovation Solution
A magnetic alignment device with adjustable magnet parts and a control system that measures and adjusts the alignment of carbon-based negative electrode active materials in real time, ensuring uniform distribution and alignment of the materials across the negative electrode current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic field is applied to the undried negative electrode slurry to orient graphite, then the charging performance of the negative electrode is improved, but the uniformity of graphite orientation becomes difficult to control due to variable magnetic field conditions
Solution Approach 1:
The patent employs adjustable magnet parts that can dynamically change their position and magnetic field strength according to the thickness and loading amount of the negative electrode slurry. This dynamic adjustment capability allows the magnetic field application conditions to be optimized in real-time for different slurry characteristics, thereby achieving uniform graphite orientation while maintaining improved charging performance.
Solution Approach 2:
The patent changes the parameters of the magnetic field application by adjusting the distance between magnet parts and the strength of the magnetic field based on the slurry thickness and loading amount. By varying these parameters, the system achieves consistent graphite orientation uniformity across different slurry conditions while maintaining the beneficial charging performance enhancement.
2Manufacturing precision
If permanent magnets are provided in the manufacturing device for various negative electrode models, then the alignment of carbon-based active material is improved, but the device complexity increases due to difficulty in controlling magnetic field application means according to different specifications
Solution Approach 1:
The patent uses magnet parts with adjustable positions rather than fixed permanent magnets for each electrode model. The magnet parts can be dynamically repositioned and their field strength adjusted to accommodate different negative electrode specifications, simplifying the control system while maintaining high alignment precision for carbon-based active materials.
Solution Approach 2:
The patent designs a universal magnetic field application system that can handle various negative electrode models and specifications through a single adjustable mechanism. The magnet parts serve multiple functions by adapting to different slurry thicknesses, loading amounts, and electrode dimensions, thereby reducing device complexity while achieving consistent alignment quality across different product variants.
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 device achieves high alignment and uniformity of carbon-based negative electrode active materials, enhancing lithium ion mobility and reducing resistance during charging and discharging, thereby improving battery performance.
Implementation Method 1
a first magnet part and a second magnet part which are arranged at upper and lower portions of the traveling electrode sheet, respectively... to orient a carbon-based negative electrode active material by applying a magnetic force
Data Source
AI summary
A magnetic alignment device includes a first magnet part and a second magnet part, an alignment measuring part, and a control part. The first and second magnet parts accommodate an electrode sheet therebetween and the alignment measuring part measures an alignment of the carbon-based negative electrode active material with respect to the negative electrode current collector. The control part adjusts the separation distance of the first and second magnet parts based on a degree of the alignment of a carbon-based negative electrode active material. The alignment of the negative electrode active layer dried with the magnetically aligned carbon-based negative electrode active material is measured in real time, and the strength of the magnetic field can be controlled by individually adjusting the spacing distance of the unit magnets according to the alignment of the carbon-based negative electrode active material measured. A method of manufacturing the same is also provided.