Battery Module Flame Retardant Plate Gas Venting Design
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Solution Overview
Problem
Existing battery modules face issues with gas inflow and detachment of flame retardant covers during ignition, leading to thermal propagation and potential explosion, and require cumbersome manual attachment of adhesives.
Innovation Solution
A battery module structure featuring a flexible flame retardant cover with slits and a rigid flame retardant plate with venting holes, coupled securely using fastening members, to allow gas discharge while preventing inflow and maintaining stability under high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a venting hole is provided in the housing to discharge high-temperature gas, then gas discharge function is improved, but external high-temperature gas can flow into the housing causing thermal propagation
Solution Approach 1:
A flame retardant cover is introduced as an intermediary component between the venting hole and the external environment. This cover allows internal gas to pass through while blocking external gas from entering, effectively mediating the harmful effects on both sides.
Solution Approach 2:
The flame retardant cover is provided with a slit at a specific location rather than being completely sealed, creating local quality differentiation. The cover material itself has flame retardant properties that differ from the housing material, enabling selective gas passage while maintaining fire resistance.
2Object-affected harmful factors
If a flame retardant cover is attached to the housing surface using adhesive, then gas inflow prevention is improved, but the cover can be detached due to adhesive vulnerability to heat and pressure
Solution Approach 1:
The attachment system is segmented into multiple components: the flame retardant cover, adhesive areas with heat-resistant properties, and reinforcing structures. This segmentation allows each component to specialize in specific functions while collectively providing reliable attachment under high temperature and pressure conditions.
Solution Approach 2:
The flame retardant cover assembly uses composite materials including heat-resistant adhesive and flame retardant materials that maintain structural integrity at high temperatures. This composite structure prevents both gas inflow and cover detachment simultaneously.
3Manufacturing precision
If adhesive is applied manually to the adhesive area, then attachment precision is improved, but manufacturing complexity and time increase
Solution Approach 1:
The adhesive areas are pre-formed as integral parts of the flame retardant cover structure during manufacturing. This preliminary action eliminates the need for manual adhesive application during assembly, maintaining precision while reducing manufacturing complexity and time.
Solution Approach 2:
The flame retardant cover structure includes self-aligning features and pre-positioned adhesive areas that automatically locate and attach to the housing surface without requiring manual positioning or application, enabling automated assembly.
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 structure effectively discharges internal gases while preventing external gas inflow, maintains structural integrity, and allows for automated assembly without manual adhesive application.
Implementation Method 1
the flame retardant cover and the flame retardant plate sequentially cover a surface of the housing
Implementation Method 2
a flame retardant cover including a flexible sheet with heat-resistant properties and provided with a slit
Implementation Method 3
a flame retardant plate including a rigid plate with heat-resistant properties and provided with a second venting hole
Data Source
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AI summary
The present invention provides a structure of a battery module including: a battery cell assembly; a housing accommodating the battery cell assembly and provided with a first venting hole; a flame retardant cover comprising a flexible sheet with heat-resistant properties and provided with a slit; and a flame retardant plate comprising a rigid plate with heat-resistant properties and provided with a second venting hole, wherein the flame retardant cover and the flame retardant plate sequentially cover a surface of the housing.