Battery Separator with Metal Hydroxide Particles for Heat Suppression
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face challenges in suppressing heat generation during abnormalities while minimizing resistance increase during normal use, as metal hydroxide particles added to electrodes contribute to heat absorption but also increase resistance.
Innovation Solution
A separator for non-aqueous electrolyte secondary batteries is developed, comprising a porous film with a resin composition containing thermoplastic resin and metal hydroxide particles, which absorbs heat and dehydrates to control heat generation without increasing resistance, using a controlled volume ratio of metal hydroxide particles to thermoplastic resin to balance heat absorption and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal hydroxide particles are added to the electrode, then heat generation is suppressed on abnormality occurrence, but resistance increases during normal use
Solution Approach 1:
The patent divides the battery into functional zones: metal hydroxide particles are segregated to the separator rather than distributed in the electrode, and the separator itself is divided into regions with different metal hydroxide concentrations. This spatial segmentation allows heat suppression functionality to be isolated to abnormality-prone areas while preserving electrode performance.
Solution Approach 2:
The separator is designed with non-uniform metal hydroxide particle distribution, creating regions of different heat absorption capacity. Areas closer to electrodes have higher metal hydroxide content for immediate heat suppression, while other regions have lower content to maintain porosity and ion transport. This local quality variation optimizes both heat suppression and normal operation.
2Object-affected harmful factors
If metal hydroxide particles are added to suppress heat generation, then safety is improved, but porosity decreases
Solution Approach 1:
The patent optimizes the metal hydroxide particle content parameter within a specific range (1-60 parts by volume per 100 parts thermoplastic resin) to balance heat suppression capability with porosity maintenance. This parameter control ensures sufficient heat absorption while preserving the separator's porous structure for ion transport.
Solution Approach 2:
The separator is constructed as a composite material combining thermoplastic resin matrix with dispersed metal hydroxide particles. This composite structure leverages the thermoplastic resin to maintain porosity and structural integrity while the metal hydroxide particles provide heat suppression functionality, achieving synergistic properties.
3Temperature
If metal hydroxide particles are added to the electrode, then cooling effect is enhanced, but increase in resistance is accelerated
Solution Approach 1:
The patent extracts the metal hydroxide particles from the electrode composition and places them exclusively in the separator. This extraction eliminates the harmful interaction between metal hydroxide particles and electrode materials that causes resistance increase, while preserving the cooling effect through the separator's proximity to both electrodes during abnormal conditions.
Solution Approach 2:
The separator acts as an intermediary medium that hosts the metal hydroxide particles, mediating between the electrodes and the heat suppression function. This intermediary role allows the metal hydroxide particles to cool the battery during abnormalities without directly contacting electrode materials, thereby avoiding resistance increase while maintaining cooling effectiveness.
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 separator effectively suppresses heat generation during abnormalities while maintaining low resistance during normal use by utilizing metal hydroxide particles in a controlled manner within the battery's porous structure, enhancing both safety and performance.
Implementation Method 1
Thermal decomposition of metal hydroxide particles brings about a heat absorption and dehydration reaction
Implementation Method 2
Thermal decomposition of metal hydroxide particles brings about a heat absorption and dehydration reaction
Implementation Method 3
pores are closed as a result of melting of a thermoplastic resin
Data Source
AI summary
A separator is for a non-aqueous electrolyte secondary battery. The separator includes at least a porous film. The porous film contains a resin composition. The resin composition contains a thermoplastic resin and metal hydroxide particles.