Thermally Conductive Mesh for Battery Flame Quenching
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Solution Overview
Problem
Lithium ion batteries face issues with firing due to contamination or safety protection failures, which can hinder miniaturization and lead to equipment size limitations when traditional fire-extinguishing agents are used.
Innovation Solution
A battery design incorporating a mesh portion made of thermally and electrically conductive wires, such as stainless steel, facing an exhaust hole to effectively extinguish flames without increasing the battery's size, while maintaining electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fire-extinguishing agent is provided inside a battery or battery pack, then fire safety is improved, but the battery or battery pack size increases
Solution Approach 1:
The patent extracts the fire-extinguishing function from a separate agent container and integrates it into the mesh structure itself. The mesh portion made of thermally and electrically conductive wires provides fire safety without requiring additional fire-extinguishing material, thus eliminating the volume increase associated with traditional fire-extinguishing agents.
Solution Approach 2:
The patent changes the physical state and properties of the fire safety mechanism by using a mesh structure with specific thermal and electrical conductivity parameters. The mesh portion's conductive properties enable it to quench flames through heat conduction and electrical discharge, replacing the need for chemical fire-extinguishing agents and their associated storage volume.
2Reliability
If a mesh portion is provided to extinguish flames, then fire safety is improved, but device complexity increases
Solution Approach 1:
The mesh portion serves multiple functions simultaneously: it acts as a flame-quenching barrier, provides electrical conductivity for short-circuit protection, and maintains structural integrity. This multi-functionality integrates fire safety into the existing battery architecture without adding separate complex subsystems.
Solution Approach 2:
The patent merges the fire safety function with the existing battery structure by incorporating the mesh portion into the sealing member or case. This integration combines the protective function with the structural components already present in the battery, avoiding the need for separate fire safety systems.
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 mesh portion effectively absorbs heat and extinguishes flames, minimizing damage and allowing for miniaturization of batteries and equipment without compromising performance or size constraints.
Implementation Method 1
The mesh portion is provided so as to face an exhaust hole formed in at least one of the case and the sealing member... The mesh portion effectively absorbs heat and extinguishes flames
Implementation Method 2
A battery design incorporating a mesh portion made of thermally and electrically conductive wires, such as stainless steel
Data Source
AI summary
A battery includes an electrode group, a case, a sealing member, and a mesh portion. The electrode group includes a positive electrode, a negative electrode opposing the positive electrode, an electrolyte interposed between the positive electrode and the negative electrode. The case has an opening and contains the electrode group. The sealing member closes the opening of the case. The mesh portion is provided so as to face an exhaust hole formed in at least one of the case and the sealing member. The mesh is formed of a thermally conductive material to put off frame coming out of the exhaust hole, in case where the battery is so defective to ignite fire.