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EPS shell material - flame retardant material
EPS battery cell Envelope Protection Structure (EPS) is an external protection structure used for battery modules or cell batteries, and its material selection directly affects the safety, durability and performance of the battery. Flame retardant materials play an important role in the application of EPS battery cell shell, and the following is a detailed introduction to this topic:
main content
Flame retardant polypropylene (PP)
Polypropylene (PP) is a lightweight, heat-resistant plastic material, but it is itself flammable. The flame retardancy of PP can be improved by adding flame retardants. Flame-retardant PP plastics are widely used in electronic appliances, home appliances, automobiles and other fields with flame-retardant components. Flame retardant PP mainly includes the use of added flame retardants and reactive flame retardants. Additive flame retardants are added to PP by mechanical mixing, while reactive flame retardants are grafted onto the main or side chain of PP by chemical reaction. The flame retardant mechanism of flame retardant PP includes terminating the chain reaction and forming a protective film to isolate the air.
Halogen-free flame retardant enhanced PP
Halogen-free flame retardant reinforced PP is an environmentally friendly flame retardant material with excellent rigidity, dimensional stability, impact resistance and heat resistance. The material is not easily deformed or damaged when subjected to external force, has good encapsulation and can withstand lithium hexafluorophosphate electrolyte. When applied to electric vehicles, halogen-free flame retardant enhanced PP has good fire performance, which can prevent ignition and reduce the flame spread speed when the electrolyte leaks, and win time for personnel escape and fire extinguishing.
Flame retardant ABS material
ABS material is composed of acrylonitrile, butadiene and styrene, which has good comprehensive mechanical properties and processing properties. Flame retardant ABS has high impact strength and excellent fire resistance, which can effectively reduce the risk of fire and delay the spread of fire. In addition, flame retardant ABS has good fluidity, easy processing, good toughness against high and low temperatures, and stable chemical properties.
Heat insulation and flame retardant coating material
he material includes halogen-loaded epoxy resin and amine cured film forming system, flame retardant, foaming expansion agent, carbon forming agent, carbon-based reinforcement filler and hollow microbeads. This coating is coated on the inner plate or metal outer plate surface of the lithium battery pack housing, which can rapidly expand more than 20 times under high fire temperature to block the spread of fire, and provide fire escape time of 30 minutes.
Flame retardant mechanism
The flame retardant mechanism of flame retardant materials includes terminating the chain reaction and forming a protective film to isolate the air. For example, the hydrogen halide produced by halide decomposition can trap high-energy free radicals, reduce the highly active free radicals, and eventually cut off the chain reaction caused by the free radicals, ending the combustion.
CONCLUSION
In summary, the flame retardant materials used in the EPS battery cell shell can effectively protect the battery safety, reduce the risk of fire, and provide more escape time in the event of fire by improving the flame retardant performance of the material. The selection and application of these materials are critical to improving the safety of batteries.
EPS BATTERY SERIES
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Extended reading
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