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The choice of materials for lead-acid battery cases is crucial as it directly impacts the safety, longevity, and application of the battery. Here’s a detailed breakdown of the modified PP and modified ABS materials used.
Modified PP (Polypropylene) Materials
Modified PP is widely used in lead-acid battery cases, especially in automotive starting batteries and Valve-Regulated Lead-Acid (VRLA) batteries, due to its excellent acid resistance, good impact strength, and relatively low cost. Modifications are made to enhance its properties further:
Application: Ideal for batteries requiring higher structural integrity and resistance to deformation, such as those used in micro-hybrid automotive start-stop systems.
Modified ABS (Acrylonitrile Butadiene Styrene) Materials
Modified ABS is known for its high mechanical strength, good surface appearance, and excellent flame retardancy. It's often chosen for batteries where casing strength, flame resistance, and aesthetics are higher priorities.
This is a key focus for modification. Adding flame retardants can help the material achieve high flame retardancy ratings, such as UL94 V-0.
Application: Primarily used in applications with high safety standards, such as batteries for UPS units, telecom base station backup power, and power systems, effectively reducing fire risk.
To balance multiple properties, alloying is used. For example, ABS can be blended with PC (Polycarbonate) .
Advantage: These alloys retain ABS's good processability while incorporating PC's high strength, high heat resistance, and inherent flame retardancy, or EVA's excellent toughness, resulting in superior overall performance.
Selection Reference:
Choosing the right material depends on matching the specific application requirements of the battery:
Prioritizing Cost & Overall Performance: For common automotive starting batteries, modified PP is often the cost-effective choice.
Requiring High Strength & Safety: For applications like data center UPS backup or telecom base stations, where flame retardancy and casing strength are critical, high flame-retardant modified ABS or ABS/PC alloys are more suitable.
Operating in High-Temp Environments: If the battery will be exposed to high temperatures long-term (e.g., under the hood), heat-resistant modified PP or heat-resistant ABS and its alloys should be selected.
