Layered Magnet Assembly for Battery Material Orientation
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Solution Overview
Problem
The challenge is to enhance the magnetic force for the orientation of active materials in lithium secondary batteries without increasing the size of the magnet, as larger electromagnets generate excessive heat, making it difficult to produce large-sized permanent magnets.
Innovation Solution
A magnet assembly comprising a metal plate with a lower layer and an upper layer of permanent magnets forming a matrix, where the ratio of the magnet's length to the combined thicknesses of the layers is 3:1 to 1:2, and the magnets are arranged with alternating polarities to maximize the attractive force and minimize repulsive forces, allowing for increased magnetic strength without size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the size of an electromagnet is increased to enhance magnetic force, then the magnetic force increases, but the heat generation increases making it difficult to produce large-sized permanent magnets
Solution Approach 1:
The patent divides a single large magnet into multiple smaller permanent magnets arranged in an array. Each small permanent magnet generates magnetic force, and their combined effect provides the required total magnetic force without the heat generation issues of a single large electromagnet. The magnets are arranged with alternating polarities to create a uniform magnetic field across the active material layer.
Solution Approach 2:
The patent changes the physical parameters of the magnet system by using multiple small magnets instead of one large magnet. The key parameter is the ratio of the length of each permanent magnet to the thickness of the active material layer, which is optimized to be between 1:1 and 3:1. This parameter optimization ensures sufficient magnetic force penetration while maintaining the advantages of small magnet size.
2Force
If multiple permanent magnets are arranged in an array to increase magnetic force, then the magnetic force increases, but the structural complexity increases
Solution Approach 1:
The magnet assembly is segmented into multiple identical permanent magnets arranged in a regular array pattern. This segmentation allows the complex magnetic field requirement to be achieved through simple repetition of identical units, reducing design complexity while increasing total magnetic force.
Solution Approach 2:
Multiple permanent magnets with alternating polarities are merged into a unified array structure that works together to produce a uniform magnetic field. The individual magnets are combined in such a way that their magnetic fields complement each other, creating a cohesive magnetic environment for orienting the active material without requiring complex individual magnet designs.
3Force
If the ratio of magnet length to layer thickness is optimized, then the magnetic force effectiveness increases, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes a specific parameter range for the ratio of permanent magnet length to active material layer thickness (1:1 to 3:1). This parameter optimization ensures effective magnetic force penetration while providing a practical manufacturing tolerance range that balances performance with manufacturability.
Solution Approach 2:
The patent applies different dimensional characteristics to different parts of the magnet assembly. The length of the permanent magnets (in the direction of magnetic force application) is specifically optimized relative to the layer thickness, while other dimensions can vary within practical manufacturing limits. This local optimization of critical dimensions maintains manufacturing feasibility.
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 enables a stronger magnetic field without heat generation, allowing for efficient orientation of active materials in secondary batteries, as the use of permanent magnets eliminates the need for heat removal systems and allows for increased magnetic strength without enlarging individual magnets.
Implementation Method 1
a magnetic field may be applied to perform an orientation process
Implementation Method 2
an assembly is formed by assembling a plurality of permanent magnets, the strength of the magnet may be increased
Implementation Method 3
when the size of an electromagnet is increased, an amount of heat generated by an exoergic reaction also increases
Data Source
AI summary
A magnet assembly for orientation according to an embodiment of the present disclosure includes a metal plate, a lower layer attached to the metal plate and including a plurality of permanent magnets that form a matrix, and an upper layer on the lower layer and including a plurality of permanent magnets that form a same matrix as the matrix, wherein a ratio of a length of one of the plurality of permanent magnets with respect to a sum of thicknesses of the lower layer and the upper layer is 3:1 to 1:2.