3D Fiber-Reinforced Heat Suppression Sheet for Battery Pack Compression
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Solution Overview
Problem
Existing heat insulation sheets for battery packs struggle to maintain their shape and heat insulation performance at high temperatures, especially due to the increased expansion rate of advanced battery cells during charging and discharging.
Innovation Solution
A heat transfer suppression sheet composed of a first inorganic particle, a resin binder, and an organic fiber with a glass transition point higher than the resin binder, which forms a three-dimensional framework and is reinforced by the resin binder, enhancing both compression properties and heat insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the capacity of battery cells is improved, then the energy storage increases, but the expansion rate during charging and discharging increases, causing the heat insulation sheet to lose strength and heat insulation performance
Solution Approach 1:
The patent uses a composite material consisting of inorganic particles (such as silica, alumina, or titanium oxide) combined with organic fibers (such as polyvinylidene fluoride or polyacrylonitrile) to form a heat insulation sheet. This composite structure provides both mechanical strength from the fiber network and thermal insulation from the inorganic particles, while maintaining stability under battery expansion forces.
Solution Approach 2:
The patent creates a localized three-dimensional network structure where inorganic particles are distributed within the organic fiber matrix. This local arrangement provides reinforcement at critical points where stress concentrates during battery expansion, maintaining overall sheet strength without compromising flexibility or insulation performance.
2Temperature
If the temperature of battery cell rises due to thermal runaway, then heat generation increases, but the heat insulation sheet cannot retain its shape, causing heat propagation to adjacent cells
Solution Approach 1:
The patent selects materials with specific thermal properties: inorganic particles with high melting points (silica >1600°C, alumina >2000°C) and organic fibers with high decomposition temperatures (polyvinylidene fluoride >400°C, polyacrylonitrile >300°C). This parameter selection ensures the sheet maintains structural integrity at temperatures up to 200-300°C, preventing shape loss during thermal events.
Solution Approach 2:
The patent utilizes the thermal expansion characteristics of inorganic particles to create a stable framework that resists compression from expanding battery cells. The inorganic particles act as spacers that maintain porosity and structural form even under high temperature and pressure conditions, converting the potential harm of thermal expansion into a beneficial shape-retention mechanism.
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 sheet effectively maintains its shape and heat insulation performance even under high compressive stress, preventing thermal runaway and flame spread in battery packs.
Implementation Method 1
the organic fiber has a glass transition point higher than a glass transition point of the resin binder
Implementation Method 2
at least a part of the organic fiber is fused each other to form a three-dimensional framework
Implementation Method 3
the resin binder is fused to a part of the framework and at least a part of the first inorganic particle
Implementation Method 4
a heat transfer suppression sheet containing: a first inorganic particle; a resin binder; and an organic fiber
Data Source
AI summary
A heat transfer suppression sheet contains a first inorganic particle, a resin binder; and an organic fiber, in which the organic fiber has a glass transition point higher than a glass transition point of the resin binder. At least a part of the organic fiber may be fused each other to form a three-dimensional framework.