Busbar Heat Dissipation Composition for Thermal Runaway Resistance
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Solution Overview
Problem
Lithium secondary batteries experience rapid temperature increases during discharge, leading to thermal runaway, which necessitates effective heat dissipation and passive propagation resistance to prevent fire propagation, increasing material costs and reducing manufacturing efficiency.
Innovation Solution
A heat dissipation composition comprising a base resin and phase change material, with a weight ratio of 2.8:1 to 1.3:1, applied to busbars to absorb latent heat and include a fire extinguishing agent, providing high heat dissipation performance and passive propagation resistance without separate fire extinguishing sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat dissipation structures and fire extinguishing sheets are added to battery packs, then thermal runaway prevention and fire propagation resistance are improved, but material costs increase and manufacturing efficiency decreases
Solution Approach 1:
The patent combines heat dissipation function and fire extinguishing function into a single integrated composition applied to the busbar. The composition contains phase change materials for heat absorption and fire extinguishing agents, eliminating the need for separate heat dissipation structures and fire extinguishing sheets, thus reducing material costs and manufacturing complexity while maintaining thermal runaway prevention and fire propagation resistance
Solution Approach 2:
The heat dissipation composition serves multiple functions simultaneously: it acts as a thermal management layer for heat dissipation during normal operation, and as a fire extinguishing medium when thermal runaway occurs. This multi-functionality is achieved by incorporating both phase change materials and fire extinguishing agents into one composition, reducing the number of components and simplifying the overall battery pack structure
2Temperature
If heat dissipation structures are added to battery packs, then temperature control during discharge is improved, but material costs and manufacturing time increase
Solution Approach 1:
The patent merges heat dissipation and fire extinguishing functions into a single composition applied directly to the busbar surface. This eliminates the need for separate heat dissipation structures and fire extinguishing sheets, reducing material costs and manufacturing time while effectively controlling busbar temperature during discharge and preventing thermal runaway
3Reliability
If separate fire extinguishing sheets are used, then fire propagation resistance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines fire extinguishing function with heat dissipation function in a single composition applied to the busbar. The composition includes fire extinguishing agents that are released when thermal runaway occurs, providing fire propagation resistance without requiring separate fire extinguishing sheets, thus simplifying the manufacturing process and reducing costs
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 composition effectively reduces busbar temperature, prevents thermal runaway, and satisfies fire prevention regulations, reducing manufacturing costs and time while eliminating the need for additional heat sinks and fire extinguishing sheets.
Implementation Method 1
a heat dissipation composition includes a base resin and a phase change material
Implementation Method 2
applied to busbars to absorb latent heat
Data Source
AI summary
A heat dissipation composition for busbars is disclosed. The heat dissipation composition includes a base resin and a phase change material, wherein a weight ratio of the base resin to the phase change material is from about 2.8:1 to about 1.3:1.