Inorganic Heat Suppression Sheet for Battery Thermal Runaway
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Solution Overview
Problem
Existing heat transfer suppression sheets for battery packs suffer from uneven distribution of fibers and particles, leading to decreased particle retention performance and strength, especially when exposed to high temperatures during thermal runaway.
Innovation Solution
A heat transfer suppression sheet comprising a fiber component and a particle component, where the main component of the first inorganic fiber is the same as the main component of the first inorganic particle, with a higher content of the main component in the particle. This configuration improves affinity and dispersibility, forming a three-dimensional network for enhanced retention and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic binder is used to retain particles in the heat transfer suppression sheet, then particle retention performance is improved, but the sheet strength and shape retention decrease at high temperatures during thermal runaway
Solution Approach 1:
The patent removes the organic binder component from the heat transfer suppression sheet, replacing it with an inorganic binder system. This extraction eliminates the high-temperature degradation issue while maintaining particle retention through alternative binding mechanisms using inorganic materials that remain stable at elevated temperatures
Solution Approach 2:
The patent changes the binding mechanism from organic chemical bonding to inorganic bonding through pH control and electrostatic interactions. By adjusting the pH of the slurry to create charged surfaces on particles and fibers, the system achieves binding without organic additives, resolving the contradiction between retention and high-temperature stability
2Manufacturing precision
If fiber and particle dispersibility is improved in the aqueous slurry, then uniform distribution is achieved, but binding property decreases due to reduced affinity
Solution Approach 1:
The patent uses pH adjustment to control the surface charge of fibers and particles, creating electrostatic attraction that provides binding strength. By optimizing the pH parameter, the system achieves both uniform distribution through improved dispersibility and strong binding through electrostatic interactions, eliminating the trade-off between these properties
Solution Approach 2:
The patent introduces pH control as an intermediary mechanism that mediates between dispersibility and binding requirements. The pH adjustment creates a charged environment that simultaneously improves particle-fiber separation for uniform distribution while generating electrostatic attraction for binding, acting as a mediator that reconciles the conflicting requirements
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 improved sheet maintains shape retention, strength, and compression properties even during thermal runaway, effectively suppressing heat propagation between battery cells and preventing chain reactions.
Implementation Method 1
a main component of a first inorganic fiber contained in the fiber component is the same kind as a main component of a first inorganic particle contained in the particle component
Implementation Method 2
heat transfer suppression sheet containing: a fiber component; and a particle component
Data Source
AI summary
A heat transfer suppression sheet contains a fiber component and a particle component. A main component of a first inorganic fiber contained in the fiber component is the same kind as a main component of a first inorganic particle contained in the particle component, and a content of the main component of the first inorganic particle is larger than a content of the main component of the first inorganic fiber.