Let me share with you: What are the applications of foam materials in power batteries?

Foam in the power battery pack can provide excellent heat insulation, buffering, flame retardant, sealing, support, shock absorption and other functions, so foam can be used in different areas of the battery pack.

In the battery cell, when the battery cell occurs thermal expansion and cold contraction, the foam can play the role of heat insulation buffer; When the thermal runaway occurs in the battery cell, the foam can prevent the transfer of heat and has flame retardant performance. In the battery pack, located under the liquid cooling plate

Square or next to the upper and lower box cover, foam can play a supporting, damping role; It can also be used as a battery sealing ring.

There are many types of foam, including PU, EVA, PE, CR, ECR, silicone foam and so on. In the actual application process of the battery system, the foam suitable for the battery cell is generally PE, PU and other materials; Get it out of the battery case

Foam for support, shock absorption and other functions is generally EVA, PE, ECR, EVA+CR, silicone foam and other materials. The foam used as a battery sealing ring is generally silicone foam and other materials.

Application of foam in power battery cell

The battery cell is the energy source of electric vehicles, the safety of the battery cell directly affects the safety of the whole vehicle, the battery cell will produce a certain amount of heat when working, and a certain amount of thermal expansion and cold contraction will occur at different temperatures

A certain amount of swelling, long-term contact friction between cells, may lead to cell damage resulting in battery failure or even out of control.

The performance requirements of new energy power batteries for intercell foam products are as follows:

Low hardness and high rebound, can absorb the stress caused by thermal expansion and contraction and play a buffer role;

Low thermal conductivity, thermal runaway, heat insulation, inhibit thermal diffusion, delay the occurrence of accidents;

Flame retardant performance, when the core fire, flame retardant effect can delay the spread of the fire;

Excellent resilience, wide ratio for compression, as positioning;

Small thickness, less space, long life.

Application of foam in support of battery pack box

Thermal management plays an important role in the power battery, which is directly related to the safety of the battery pack and the vehicle. The cooling system inside the battery pack has been converted from the traditional air cooling device to the liquid cooling device, the battery pack and the liquid cooling plate

The heat is transmitted between the thermal silica gel, but due to the poor elasticity of the thermal silica gel, the thickness is lost after long-term use, resulting in insufficient contact between the liquid cooling plate and the battery pack, affecting the thermal conductivity effect.

Solution A spring or foam can be set under the liquid cooling plate as a support material to ensure good contact between the liquid cooling plate, thermal silicone, and the module.

The performance requirements of the battery box supporting foam are as follows:

Stable support, good shock absorption effect;

Excellent temperature durability;

The loss of compressive permanent deformation and stress relaxation is small.

Excellent flame retardant performance to ensure the safety of combustion.

Application of foam in sealing ring of power battery

The battery pack is the core energy source of new energy vehicles, which provides driving electric energy for the whole vehicle. In order to protect the internal components of the battery pack from dust, rain and other erosion, the shell seal of the battery pack must reach a certain dust-proof and waterproof level.

At present, the protection level of battery packs in terms of dust and water resistance is generally IP67 or IP68. The shell sealing materials of battery pack on the market mainly fall into three categories: rubber sealing ring, sealant and foam

Medium foam material generally uses silicone foam.

Silicone foam material has excellent compression resistance permanent deformation, creep resistance can resist long-term use due to compression stress and temperature changes caused by material collapse, through continuous sealing and shock absorption to extend the use of the battery

Time.