Inorganic Heat Insulation Sheet for Battery Thermal Runaway
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heat insulation materials for battery packs face challenges in maintaining effective heat insulation across a wide temperature range, particularly at high temperatures, and in retaining shape and preventing powder falling during thermal runaway.
Innovation Solution
A heat insulation sheet comprising a combination of first and second inorganic particles and inorganic fibers, where the first inorganic particle has a specific particle diameter distribution and the second inorganic particle is a nanoparticle, providing enhanced heat insulation properties and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If nanosilica is used as the main heat insulation material, then heat insulation property is improved, but heat conductivity increases in high temperature range
Solution Approach 1:
The patent uses a composite material consisting of nanosilica particles combined with other inorganic materials (such as alumina, silica aerogel, or porous glass) to create a heat insulation sheet that maintains low heat conductivity in the high temperature range while preserving good heat insulation properties. This composite approach allows the material to overcome the limitation of nanosilica alone.
2Shape
If matrix resin is used to retain mineral-based powder and flame retardant, then shape retention is improved, but material melts at high temperature
Solution Approach 1:
The patent removes the organic matrix resin component from the heat insulation material and replaces it entirely with inorganic materials. This extraction of the resin component eliminates the melting problem at high temperatures while the inorganic particles and fibers maintain the structural shape through their inherent thermal stability.
Solution Approach 2:
The patent changes the fundamental chemical composition parameters of the heat insulation material from organic-resin-based to inorganic-particle-based. By selecting inorganic materials with appropriate particle sizes, shapes, and compositions, the material achieves both shape retention and high temperature resistance without relying on resin binders.
3Quantity of substance
If battery cell capacity is increased, then energy storage is improved, but temperature during abnormality rises
Solution Approach 1:
The patent implements preliminary protective measures by placing heat insulation sheets between adjacent battery cells before thermal runaway occurs. These sheets are pre-designed with high-temperature resistance and low heat conductivity to actively counteract and block the propagation of heat when thermal runaway occurs in high-capacity battery cells.
4Temperature
If heat insulation material contains inorganic particles and fibers, then heat insulation property is improved, but mechanical strength may be reduced
Solution Approach 1:
The patent creates a composite structure where inorganic particles (nanosilica, alumina, etc.) are combined with inorganic fibers to form a network that provides both heat insulation and mechanical strength. The synergistic combination of particles and fibers allows the material to maintain structural integrity while providing effective thermal insulation.
Solution Approach 2:
The patent utilizes porous inorganic materials such as silica aerogel and porous glass in the composite structure. These materials provide excellent heat insulation through their porous structure while the interconnected network of particles and fibers maintains sufficient mechanical strength for practical application in battery packs.
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 heat insulation sheet effectively suppresses radiant, conductive, and convective heat transfers across a wide temperature range, maintains shape retention during high-temperature events, and prevents powder falling, thereby minimizing thermal runaway propagation in battery packs.
Implementation Method 1
the heat insulation sheet effectively suppresses radiant, conductive, and convective heat transfers
Implementation Method 2
a first inorganic particle; a second inorganic particle composed of a nanoparticle
Implementation Method 3
the heat insulation sheet effectively suppresses radiant, conductive, and convective heat transfers
Implementation Method 4
the heat insulation sheet effectively suppresses radiant, conductive, and convective heat transfers
Data Source
AI summary
A heat insulation sheet contains a first inorganic particle, a second inorganic particle composed of a nanoparticle, and an inorganic fiber. A total content of the first inorganic particle and the second inorganic particle is 30 mass % or more and 90 mass % or less with respect to a total mass of the heat insulation sheet, D50 is 1 μm or more and 100 μm or less, and a ratio (D90/D10) is 10 or more and 1000 or less in a volume-based cumulative distribution of the first inorganic particle.