Porous Compression Pad Structure for Battery Module Heat Blocking
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Solution Overview
Problem
Conventional battery modules struggle to effectively prevent ignition and delay heat propagation between battery cells, particularly when one cell ignites, due to limited protection against swelling and heat conduction.
Innovation Solution
A battery module with a compression pad having a porous structure and protective inserts that form a barrier film upon swelling, using materials like urethane or polyurethane, which includes heat absorbing or insulating members, and fire extinguishing agents to block flame and heat propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional compression pad is used between battery cells, then the swelling phenomenon can be absorbed, but the heat propagation time cannot be effectively reduced when ignition occurs
Solution Approach 1:
The compression pad is constructed as a composite structure comprising a porous body and heat-resistant wool filled within the pores. This composite material design enables the pad to simultaneously provide mechanical compression for swelling absorption and thermal insulation for ignition prevention, resolving the contradiction between swelling management and fire safety
Solution Approach 2:
The compression pad utilizes a porous structural body with controlled pore sizes, into which heat-resistant wool is filled. The porous structure provides both mechanical compliance for absorbing cell swelling and thermal barrier properties to delay heat propagation between cells, addressing both swelling and ignition prevention requirements
2Stability of the object's composition
If the compression pad alone is used to protect battery cells, then swelling can be managed, but it has little effect on delaying heat propagation speed between adjacent cells
Solution Approach 1:
By combining the porous structural body with heat-resistant wool filling, the compression pad becomes a composite thermal-mechanical barrier that maintains cell spacing while providing significant thermal insulation to slow heat propagation between adjacent cells
Solution Approach 2:
The heat-resistant wool acts as an intermediary thermal barrier material embedded within the porous structure, mediating between adjacent battery cells to prevent direct heat transfer while maintaining mechanical separation and spacing
3Device complexity
If no additional protective measures are taken, then the module structure remains simple, but ignition can spread rapidly between battery cells through flame and heat conduction
Solution Approach 1:
The protective functions are merged into the existing compression pad component by filling its porous structure with heat-resistant wool, eliminating the need for separate protective components while providing comprehensive ignition prevention between cells
Solution Approach 2:
The compression pad is designed to perform multiple functions simultaneously: mechanical compression for swelling absorption, thermal insulation for heat propagation delay, and structural support for cell spacing, thereby preventing ignition spread without increasing overall module complexity
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 porous compression pad forms a barrier film to delay heat propagation and prevent ignition by releasing protective inserts to form a barrier film, effectively blocking flames and reducing heat transfer between adjacent cells.
Implementation Method 1
a compression pad disposed between the plurality of battery cells
Implementation Method 2
heat-absorbing or insulating members like sodium hydrogen carbonate or monoammonium phosphate, which form barrier films to block heat and flames
Implementation Method 3
heat-absorbing or insulating members like sodium hydrogen carbonate or monoammonium phosphate, which form barrier films to block heat and flames
Implementation Method 4
releasing these inserts when pressure is applied
Data Source
AI summary
A battery module includes a battery cell stack formed by stacking a plurality of battery cells; a module frame that houses the battery cell stack; and a compression pad disposed between the battery cells, wherein the compression pad has a porous structure.