EBT nano heat dissipation material replaces traditional graphite heat dissipation film

Test conditions and methods

• Ambient temperature RT: 25±1℃;

• Charging state (non-charging state), the initial battery level of the mobile phone is 20% (100%), the maximum volume, the medium brightness, and the screen remains always on;

• Basic operating items: settings, contacts, gallery, browser, information, GPS, Bluetooth; 

• Use Fluke Ti100 infrared imager to capture the temperature rise on the front and back of the phone, capture infrared images every 10 minutes and use the software to read the highest temperature Tmax of the test area, the test time is 90 minutes;

• Infrared image processing software: Fluke SmartView 3.14.52.0.

Constant temperature test box, infrared imager

• EBT heat sink material EBT8505A and uniform heat material EBT8207B; copy and cut the above materials according to the original graphite sheet prototype. EBT8207B is pasted on the mobile phone motherboard chip shield and above the battery (artificial graphite sheet A), EBT8207B is pasted on the inside of the back cover of the phone , The same position as the original graphite sheet (artificial graphite sheet B);

Thermal test items

Characteristics of materials used in EBT program

Test result-maximum temperature comparison

Conclusion: The solution using EBT uniform heat material and thermal conductivity material is better than the original solution

Conclusion and analysis

• The artificial graphite sheet must be encapsulated before use, so that its thermal conductivity is greatly reduced, and the actual performance is greatly reduced. 

• EBT uniform heat material is a composite material with a multifunctional layered structure designed to meet the needs of internal heat conduction and heat dissipation of electronic devices. Because nano-scale high thermal conductivity and thermal radiation powder are added to the heat dissipation coating, the heat source is amplified step by step with a multi-layer structure, the same layer has strong heat conduction, and the heat conduction between layers is relatively weak, and the thermal conductivity in the horizontal direction is enhanced to achieve The purpose of uniform heating and cooling. Compared with the traditional artificial graphite sheet, EBT heat dissipation film also has a higher specific heat capacity, absorbs heat and stores it, prolongs the heat saturation time, thereby suppressing temperature rise.

• As a new type of heat dissipation material, EBT nano heat dissipation film series has a good application prospect in the field of smart phones.