Battery Separator with Agglomeration Network Structure
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Solution Overview
Problem
Existing separators with ceramic particles and resin materials face challenges in increasing pore size and porosity, and in absorbing electrode expansion, particularly in high-power density applications like vehicle-mounted batteries.
Innovation Solution
A separator configuration with a first layer of porous substance and a second layer of resin material and particles, featuring an agglomeration network structure that crumples to absorb electrode expansion, enhancing pore size and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of ceramic particles is increased to 80% or more, then heat resistance and oxidation resistance are improved, but pore size and porosity decrease
Solution Approach 1:
The patent applies porous ceramic particles with specific pore structures to maintain high porosity (30-80%) and large pore sizes (1-10 μm) even when ceramic content reaches 80% or more. The porous structure of the ceramic particles themselves provides the necessary void space for ion transport while maintaining the high ceramic content required for heat and oxidation resistance.
Solution Approach 2:
The patent uses composite materials combining polyolefin resin with ceramic particles (metal oxides, carbides, or nitrides) to achieve both high ceramic content (80% or more) and adequate porosity. The composite structure allows the resin matrix to provide flexibility and porosity while the ceramic particles provide heat and oxidation resistance.
2Reliability
If the content of ceramic particles is increased to 80% or more, then heat resistance and oxidation resistance are improved, but mechanical strength decreases
Solution Approach 1:
The patent employs composite materials where polyolefin resin (3-20% content) provides mechanical strength and flexibility while ceramic particles (80% or more content) provide oxidation resistance. The resin matrix binds the ceramic particles together, maintaining structural integrity despite high ceramic content.
Solution Approach 2:
The use of porous ceramic particles with controlled pore structures maintains mechanical strength by providing an interconnected network that distributes stress, preventing catastrophic failure even when ceramic content reaches 80% or more.
3Productivity
If pore size and porosity are increased for high power density, then ion permeability is improved, but mechanical strength decreases
Solution Approach 1:
The patent utilizes porous ceramic particles with large pore sizes (1-10 μm) and high porosity (30-80%) to enable excellent ion permeability for high power density applications. The porous structure provides numerous ion transport pathways while the ceramic material itself maintains structural strength.
Solution Approach 2:
The composite structure of polyolefin resin and ceramic particles creates a material where the resin matrix provides mechanical strength and the porous ceramic particles provide ion permeability, achieving both high power density and adequate mechanical strength.
4Adaptability or versatility
If a porous film with high porosity is used to absorb electrode expansion, then adaptability to electrode volume change is improved, but mechanical strength decreases
Solution Approach 1:
The patent employs porous ceramic particles with high porosity (30-80%) that can compress and deform to accommodate electrode expansion. The porous structure allows the separator to absorb volume changes while maintaining structural integrity through the ceramic particle network.
Solution Approach 2:
The composite material combines polyolefin resin with porous ceramic particles to create a separator that has both the flexibility needed to absorb electrode expansion and the mechanical strength provided by the ceramic particle framework.
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 solution achieves a high power density and improved load characteristics by allowing electrode expansion absorption, maintaining ion permeability, and enhancing mechanical strength and oxidation resistance.
Implementation Method 1
The second layer has an agglomeration network structure of the particles... a separator that can absorb the expansion in volume of the electrode by crumpling
Implementation Method 2
maintaining ion permeability
Data Source
AI summary
Provided is a separator including a first layer of a porous substance and a second layer that is provided on at least one face of the first layer and that includes a resin material and particles. The second layer has an agglomeration network structure of the particles.