Battery Cell Sponge Sheet Structure for Fire-Spread Insulation
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Solution Overview
Problem
Existing fire-spread prevention sheets for battery cells lack the ability to deform elastically and maintain porosity upon overheating and expansion, which can lead to increased heat transfer and fire risks in multi-cell battery configurations.
Innovation Solution
A porous sponge sheet with elongated pores oriented in the thickness direction, made from silicone rubber and potentially including fire retardant materials, is applied to battery cells to facilitate long-term elastic deformation and enhance thermal insulation, manufactured through a process involving sandwiching, curing, and shaping to ensure high adhesion on one surface and low adhesion on the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fire-spread prevention sheet is made rigid to maintain structural stability, then thermal insulation is improved, but the sheet cannot deform elastically when battery cells expand due to overheating
Solution Approach 1:
The patent employs a porous sponge sheet structure where the porous architecture provides thermal insulation through trapped air pockets while the sponge matrix maintains elastic deformability. The pores are distributed throughout the sheet, creating a lightweight structure that can compress and rebound without losing its insulating properties.
Solution Approach 2:
The fire-spread prevention sheet is constructed as a composite material combining a sponge base structure with fire retardant materials. This composite approach allows the sheet to simultaneously achieve thermal insulation, elastic deformation capability, and fire resistance - the fire retardant additives enhance the base sponge material's properties without compromising its deformability.
2Temperature
If a porous sponge sheet is used to improve thermal insulation, then fire-spread prevention is enhanced, but the sheet loses porosity after repeated compression and release
Solution Approach 1:
The patent modifies the physical and chemical parameters of the sponge sheet by incorporating fire retardant materials and optimizing the pore structure. These parameter changes include controlling pore size distribution, wall thickness, and material composition to enhance the sheet's ability to maintain porosity under repeated compression while preserving thermal insulation properties.
Solution Approach 2:
The patent employs a porous sponge sheet structure where the porous architecture provides thermal insulation through trapped air pockets while the sponge matrix maintains elastic deformability. The pores are distributed throughout the sheet, creating a lightweight structure that can compress and rebound without losing its insulating properties.
3Object-affected harmful factors
If fire retardant materials are added to the sponge sheet, then fire resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the fire retardant materials directly into the sponge sheet manufacturing process rather than applying them as separate layers or coatings. This integration combines multiple functions (structural support, thermal insulation, fire resistance) into a single homogeneous component, simplifying the overall manufacturing process and reducing the number of assembly steps required.
Solution Approach 2:
The fire-spread prevention sheet is constructed as a composite material combining a sponge base structure with fire retardant materials. This composite approach allows the sheet to simultaneously achieve thermal insulation, elastic deformation capability, and fire resistance - the fire retardant additives enhance the base sponge material's properties without compromising its deformability.
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 solution effectively prevents fire spread by maintaining porosity and thermal insulation even after repeated compression, reducing heat transfer between battery cells and enhancing safety in electric vehicle batteries.
Implementation Method 1
A fire-spread prevention sheet also preferably contains air to improve the thermal insulation of the sheet
Implementation Method 2
The inventor developed the porous rubber sheet to maintain the porous state of the sheet by enabling long-term elastic deformation even after repeated compression and release of the sheet
Data Source
AI summary
To provide a fire-spread prevention type cell unit having a battery cell with a fire-spread prevention sheet that easily deforms in response to overheating and expansion of battery cells and maintains the porosity of the sheet by enabling long-term elastic deformation, a method for manufacturing the same, and a battery. The present invention relates to a fire-spread prevention type cell unit including a battery cell and a fire-spread prevention sheet applied to a side located in the arrangement direction of the battery cell, wherein the fire-spread prevention sheet is a porous sponge sheet, and pores inside the fire-spread prevention sheet have an elongated shape with the lengthwise direction of the pores oriented in the thickness direction of the fire-spread prevention sheet, a method for manufacturing the same, and a battery.