What specific requirements do new energy batteries have for the performance of Rogers foam?

The new energy battery has the following specific requirements for the performance of Rogers foam:

Compressibility: Good compression deformation resistance and stable rebound force are required. For example, the compression permanent deformation of Rogers Poron EV Extend series foam should be ≤5%(ASTM D3574, 70℃), which can maintain a constant push-back force during the whole service life of the battery and effectively manage the stress caused by battery cell expansion and temperature fluctuation.

Sealing performance: the foam should have a closed-cell structure, with a closed-cell ratio of > 90%, so as to realize the functions of dustproof, waterproof and moistureproof. For example, Rogers HT800 series foam can meet the sealing standards of initial IP68 and end-of-life IP67 when used to seal the power battery box.

Thermal performance: On the one hand, it should have a low thermal conductivity, such as the thermal conductivity of Rogers Z-Foam800 is 0.12 W/MK, which can effectively block the heat transfer of the battery cell and delay the uncontrolled spread of heat. On the other hand, it needs a wide temperature range. For example, the working temperature range of Rogers Bisco® HT800 is-55℃ to+200℃, which can keep its performance stable at different ambient temperatures.

Electrical insulation performance: Rogers foam should have high volume resistivity and dielectric strength. For example, Bisco® HT800 has a volume resistivity ≥ 10 Ω cm and a dielectric strength of 3.58kV/mm, which can prevent short circuit of the battery and ensure the electrical safety of the battery system.

Flame retardant performance: the flame retardant grade of foam should reach UL94 V-0 or higher. For example, Rogers Bisco® HT800 and Poron EV Extend series foam have good flame retardancy, which can delay the spread of fire when the battery is out of control.

Mechanical properties: Appropriate tensile strength and tear strength are required to ensure that the foam is not easily damaged during use. For example, the tensile strength of Poron EV Extend 43 is 345kPa and the tear strength is 1.23 kN/m..