Product Name: Graphite Heat Sheet (Graphite Thermal Pad / Graphite Heat Spreader)
Description:
Graphite Heat Sheet is a thin, flexible, and lightweight thermal interface material engineered for efficient heat spreading and dissipation. Unlike traditional metal heat sinks, graphite sheets provide anisotropic thermal conductivity – extremely high heat transfer along the planar direction (X-Y axis) while offering insulation in the thickness direction (Z-axis). This makes them ideal for confined spaces where heat needs to be spread quickly away from hotspots.
For EV battery applications, graphite heat sheets are used as thermal management layers between battery cells, between cells and cooling plates, or as part of the battery module insulation system.
Key Features:
Ultra-High Thermal Conductivity: In-plane thermal conductivity: 300 – 1500 W/m·K (depending on grade)
Lightweight: Density: 0.8 – 2.0 g/cm³, significantly lighter than copper or aluminum
Thin & Flexible: Thickness range: 0.01mm – 1.0mm, can be bent or wrapped around components
Electromagnetic Shielding: Provides EMI/RFI shielding effectiveness
Compressible (for some grades) : Can fill gaps and conform to uneven surfaces
Thermal Stability: Operating temperature: -40°C to +400°C (depending on grade)
Electrical Insulation Option: Available with single or double-sided insulation coating (PI, PET, or PC film lamination)
Product Variations:
| Grade | Thermal Conductivity (X-Y) | Thickness | Typical Application |
|---|---|---|---|
| Standard Graphite Sheet | 300 – 600 W/m·K | 0.01 – 0.5mm | Smartphones, tablets, laptops |
| High-Performance Graphite Sheet | 800 – 1500 W/m·K | 0.02 – 0.2mm | High-end electronics, 5G devices |
| Compressed Graphite Sheet | 5 – 30 W/m·K (through-plane) | 0.2 – 1.0mm | EV battery thermal pads, power electronics |
| Insulated Graphite Sheet | Same as base | 0.05 – 0.5mm | Applications requiring electrical isolation |
Typical Applications:
Consumer Electronics:
Smartphone and tablet heat dissipation (between CPU/display/battery)
Laptop and ultrabook thermal management
LED lighting heat spreading
Wearable devices (smartwatches, fitness trackers)
Electric Vehicle (EV) Battery:
Thermal interface between battery cells (pouch cells, prismatic cells)
Heat spreading layer between cell surface and cooling plate
Battery module internal thermal equalization
Battery pack insulation and thermal runaway prevention (with insulation coating)
Other Applications:
Power electronics and IGBT modules
Server and data center components
Automotive electronics (ADAS, infotainment systems)
Technical Specifications (Reference):
| Parameter | Standard Grade | High-Performance Grade |
|---|---|---|
| Material | Natural / Synthetic Graphite | Synthetic Graphite |
| In-Plane Thermal Conductivity | 300 – 600 W/m·K | 800 – 1500 W/m·K |
| Through-Plane Thermal Conductivity | 3 – 8 W/m·K | 5 – 15 W/m·K |
| Thickness Range | 0.01 – 0.5 mm | 0.02 – 0.2 mm |
| Density | 0.8 – 1.5 g/cm³ | 1.5 – 2.0 g/cm³ |
| Operating Temperature | -40°C to +250°C | -40°C to +400°C |
| Tensile Strength | ≥ 15 MPa | ≥ 25 MPa |
| Electrical Resistivity | ~1000 µΩ·m (in-plane) | ~800 µΩ·m (in-plane) |
| RoHS Compliant | Yes | Yes |
Optional Laminations (for electrical insulation):
| Laminate Material | Thickness | Dielectric Strength | Application |
|---|---|---|---|
| PI (Polyimide) Film | 0.0125 – 0.025mm | ≥ 5 kV | High-temperature applications |
| PET (Polyester) Film | 0.025 – 0.05mm | ≥ 4 kV | General electronics |
| PC (Polycarbonate) Film | 0.05 – 0.125mm | ≥ 6 kV | EV battery insulation (UL94 V-0 available) |
Why Choose Our Graphite Heat Sheet?
Superior Heat Spreading: Quickly eliminates hotspots and improves device reliability
Space-Saving Design: Ultra-thin profile fits into tight assemblies
Custom Die-Cutting: Available in any shape, size, or configuration
Adhesive Options: Single or double-sided PSA for easy installation
Insulation Customization: Lamination with UL94 V-0 insulation films for EV battery safety
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