Lithium battery holder/casing

Modified PPO (Polyphenylene Oxide) exhibits excellent chemical resistance, providing robust corrosion protection against materials such as lithium cobaltate (LiCoO₂) and lithium manganate (LiMn₂O₄). Its advantages include dimensional stability, exceptional flame retardancy (halogen-free), low-temperature resistance, and high impact strength, making it an ideal material for lithium-ion battery protective housings. Specifically designed for battery enclosure applications, halogen-free flame-retardant modified PPO utilizes a proprietary ternary blend graft toughening technology, achieving a notched impact strength exceeding 20 kJ/m²—significantly higher than conventional PPO materials (typically 15–20 kJ/m²). This enhanced impact resistance (twice that of standard modified PPO) ensures the housing remains intact during vehicular collisions, mitigating risks of cracking and short circuits, thereby substantially improving battery safety

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Additionally, the material demonstrates the following characteristics:

Product Requirements:

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Low specific gravity, possessing the lowest density among engineering plastics

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Excellent chemical corrosion resistance

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Outstanding high and low temperature resistance, coupled with superior mechanical properties

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High flowability, excellent processability, and superior surface gloss

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UL94 halogen-free flame retardancy (bromine/antimony-free), compliant with EU environmental regulations

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Excellent dielectric properties, suitable for electrical applications

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Superior weatherability, ensuring long-term performance stability under harsh climatic conditions

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Technical Context for New Energy Electric Vehicles:

While new energy vehicles offer significant advantages, concerns persist regarding lithium-ion battery safety. Key risks include:

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Dendrite formation: During overcharging or even normal cycling, lithium ions may accumulate on the anode, forming dendrites that puncture the separator, leading to internal short circuits and potential fire hazards.

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Impact-induced failure: In collisions, inadequate impact resistance of battery housings can cause cracking, short circuits, and subsequent thermal runaway, jeopardizing vehicle and passenger safety.

Given that lithium-ion batteries constitute up to 60% of the cost in pure electric vehicles and offer benefits such as lightweight design, high energy density, long cycle life, and broad temperature adaptability, enhancing housing materials like modified PPO is critical for long-term safety and market confidence in electrified transportation

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Key Terminology Notes:

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Halogen-free flame retardancy: Complies with IEC 61249-2-21 and EU RoHS standards.

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Impact strength: Measured via Charpy/Izod tests (units: kJ/m²).

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Dielectric properties: Include dielectric constant (∼2.5–3.0) and dissipation factor (∼0.0004–0.0009) across frequencies

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Weatherability: Evaluated per ISO 4892 (xenon arc exposure) for UV/thermal stability.

This translation aligns with industry-standard terminology (e.g., ASTM, ISO) for technical accuracy in materials science and energy storage applications.