Introduction
Silicone foam material (also known as: silicone foam / foam silicone), is a porous, low density, compressible polymer elastomers made under high pressure and high temperature by a special process, after mixing evenly with silicone like rubber raw rubber, filler, vulcanisation accelerator, foam, etc. as raw materials. Because of the high elasticity of silicone rubber, but also with the foam material has the sound insulation, shock absorption and other properties, widely used in life, mostly used as vibration damping pads, sealing gaskets, sound-absorbing materials, insulation materials, airlines, thermal insulation materials. According to the structure of the bubble, organic silicone foam is divided into closed-cell, open-cell and mixed type three.
Application Scenario
Closed-cell foaming organic silicone foam material has a better shockproof buffer, sound insulation, heat insulation and heat preservation, as well as flame retardant and explosion-proof characteristics, which is mainly used in the automotive field of automotive car air conditioning insulation foam tubing, automotive vibration damping, new energy vehicle batteries with foam silicone sealing gaskets and so on.
Many of today's automotive interior materials, such as flooring, roof, steering wheel, car seats, etc. are polyurethane foam materials, on the one hand, because of the polyurethane foam material technology is relatively mature, performance in line with the use of standards; on the other hand, because of the lower price of polyurethane foam materials.
However, polyurethane foam material weathering performance is poor, flammable and combustion process releases a large number of toxic gases harmful to humans. Therefore, with the promotion of organic silicone foam material and people's awareness of its enhancement, the future of organic silicone foam material is expected to replace the traditional polyurethane foam foam material.
Insulating silicone is a kind of silicone prepared with alkali-free ultrafine glass wool, room temperature vulcanised silicone rubber, fumed silica, iron oxide, hydroxyl silicone oil and other raw materials.
Silicone thermal insulation cushioning frame products with cushioning, thermal insulation, can be applied to new energy vehicles lithium battery thermal protection field.
Silicone foam in the new energy vehicle power battery applications
The characteristics of silicone foam:
1. Density of silicone foam.Silicone foam matrix density of 1.17 g/cm3. But through the foaming process, the current mature process of organic silicone foam material prepared in the density can be as low as 0.16-0.20 g/cm3, can be used for automotive seats, headrests and other parts; and conventional silicone rubber foam material (density of 0.45 g/cm3) is widely used for sealing, shock absorption and other parts of the gap filling.
2.Flame retardant properties of silicone foam.According to scientific experimental research data, the addition of flame retardant silicone foam has good flame retardant properties, flame retardant grade can reach UL94-V0, applied to electric vehicles, can be a good way to reduce the problems caused by combustion.
3.Silicone foam electrical insulation properties.With the increase in the amount of physical filler, the volume resistivity and surface resistivity of silicone rubber tends to decrease, the dielectric constant and dielectric loss factor overall tends to increase. It can be seen that the addition of physical fillers to a certain extent impaired the electrical insulation properties of silicone rubber.
Silicone foam in the electric vehicle industry:
The electric core is the source of kinetic energy of pure electric vehicles, electric core safety hazards seriously endanger the safety of the entire vehicle, the electric core in the work, will produce a certain amount of heat, in different temperatures can produce a certain thermal expansion and contraction effect, resulting in a certain amount of expansion of the electric core, the electric core between the long-term capacitive grid friction, it is very likely that it will cause damage to the electric core leading to the invalidation of the rechargeable batteries, and in severe cases, and even can not be controlled. In addition, the output voltage of the battery pack reaches 200V, the rechargeable battery case must be sealed waterproof, to avoid water seepage caused by short circuit, rechargeable battery case waterproof level to IP67.
Silicone foam in the new energy vehicle power battery applications
Silicone foam with high shrinkage reduction characteristics, in the battery charging - charging and discharging the whole process to avoid the deformation caused by thermal expansion and contraction of the rechargeable battery Cell, with excellent durability, low shrinkage, impact absorption and flame retardant properties (UL 94 V0 rating). At the same time, silicone also has good waterproof performance, as well as the following properties, so in the new energy battery cell cache thermal insulation, frame sealing in a wide range of applications.
1. in different temperatures, silicone foam performance is stable, commodity sealing ring performance is smooth.
- Excellent waterproof sealing, no water seepage when the commodity is used outside.
- long-term shrinkage damage is small, with a certain curb shrinkage deformation of the working ability.
- Excellent flame retardant performance, can effectively prevent the battery work due to the thermal effect of the risk.
- thickness and strength can be designed according to different standards, sealing ring must be excellent with the shell and low internal stress, can effectively avoid sealing ring bending arch.
New energy vehicle lithium battery application of thermal conductive silicone film working principle: because the temperature difference inside the battery pack is not controlled within 5 ℃, the battery pack need to be affixed to the top and bottom of a thermal conductive silicone film, thermal conductive silicone film, and then direct the temperature to the outside of the aluminium shell, the temperature difference between the entire battery module is controlled at 5 ℃ or less to achieve the needs of the battery pack design to prolong the service life of the battery pack, so that the performance of the process of driving is more stable.
Between the batteries and between the batteries and the pipeline, the filling of thermal conductive silicone film with good electrical insulation and thermal conductivity can play the following roles:
1. the battery and heat pipe contact form from line contact to surface contact;
- is conducive to improving the temperature between single batteries;
- is conducive to improving the overall heat capacity of the battery pack, thereby reducing the overall average temperature.
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