Battery Thermal Runaway Protect Mica Sheet Winding Insulation Mica Materials EMI
Settling on one particular solution for any thermal or electrical junction can be daunting, given the array of choices available.
Polymers for example come in a range of forms to provide different levels of thermal protection for various parts. Silicone and Nomex, for instance, are well-established and widely used throughout EV and HEV components for their thermal, electrical and chemical resistance.
Silicone has strong silicon-oxygen atomic bonds that lend it towards high heat stability and resistance to oxidisation. With operating temperatures typically exceeding 200220 C, silicones are used as insulating sealants for electronic components and as jacket materials for high-voltage cables, for example.
Nomex is similar to Kevlar or Nylon, but with greater thermal and chemical resistance, and has long been used in a range of vehicles (from EVs to racecars) as a thermal and flame barrier, often as a sheet, although it is also available as a fibre. And when manufactured as long, thin sheets, it can be used as a slot insulator between the stator teeth of low-to-medium voltage motors, to reduce the aggregation of heat which might break down the enamelled insulation layer on the copper wires.
Polyester films such as Mylar, Lumirror and Hostphan also provide high thermal and mechanical resistance, and thus have similar versatility to Nomex, being applicable to batteries, motors and other electronic applications. Polyesters have found significant use as insulation for the busbars between battery modules.
As well as films, rubbers and aramids such as these, polyimide foams can maintain their structural integrity between -196 C and +300 C. These have a semi-open cell structure that minimises heat flow as well as sound vibration, making them useful for thermal as well as acoustic insulation.
The physical nature and manufacture of a polyimide foam will vary according to its application. The greater the need for thermal insulation, for example, the more the foam should be ‘densified’ under combined heat and pressure to enhance its thermally resistive properties (and to ruggedise it for harsher environments).
- Saves electricity/power cost
- Longevity
- Cost Effective
- Available in various thicknesses and sizes
- Easy Available
- Easy to Fabricate Parts
- Gaskets
- Available in various thicknesses (0.06mm -> 50mm)
- Easy to store
| Item |
Rigid mica sheet |
| Mica |
Phlogopite |
| Mica content % |
>90 |
| Bond content % |
<10 |
Density
g/cm 3 |
1.7~2.15 |
| Heat Resistance |
Continuous service °C |
700 |
| Intermittent service °C |
900 |
Flexural strength
N/mm 2 |
>150 |
| Water absorption % |
<1.5 |
| Dielectric strength KV/mm |
>20 |
| Insulation resistance |
23 °C ohm.cm |
>10 17 |
| 500 °C ohm.cm |
>10 12 |
| Heat loss |
at 500 °C % |
<1 |
| at 700 °C% |
<2 |
Standard Supply:
Thickness: 0.10-1.90mm+/-0.05mm
Size: 1000*600/1200/2400mm
We customized strips or parts according to the customer’s drawing or requirements.
- Contact Shoes
- Electric Heating Appliances
- Electrical Apparatus
- Electrical Control
- Electrical Lighting Equipment
- Hangers for Pressure Rings
- Industrial Electric Heating Appliances
- Mantle Lower
- Mechanical Uses
- Miscellaneous Electrical Uses
- Motors and Generators
- Protection Shield
- Radar
- Radio
- Smoke Hood Assembly
- Suspension Links
- Television
- Transformers
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