2, plastic battery slot, cover
After the 1980s, China's valve-regulated sealed lead-acid batteries were gradually transferred from the introduction and self-development to mass production. The slot and cover of early valve-regulated sealed lead-acid batteries used SAN materials. At present, the use of SAN and ABS materials is more common, and there are also PP or PVC materials. Most of foreign valve-regulated battery cell covers are made of PP or AS materials. The technical parameters that characterize the properties of these materials are summed up in terms of mechanical properties, electrical properties, thermal properties, etc., and must meet the requirements for battery use.
Mechanical properties: Mechanical properties also include impact resistance, vibration resistance, compression resistance and bumps. It should also include consideration of natural disasters (such as earthquakes) and gas expansion caused by excess gas in the storage battery.
Corrosion resistance: The battery tank is exposed to a sulfuric acid solution with a density of 1.25 to 1.32 g/cm3 for a long time at a certain temperature, and no change due to long-term corrosion, such as swelling, cracking, and discoloration, should occur.
Oxidation resistance: The battery may work in various environments, so the battery tank is required under the influence of ultraviolet radiation or atmospheric corrosion and can not produce discoloration and brittle phenomenon, otherwise it will affect the appearance and mechanical strength of the battery. At the same time, the battery tank should also have the ability to resist oxygen infiltration.
ABS resin is a general term for impact resistant thermoplastic resins consisting of three components: Acrylonitrile, Butadiene, and Styrene. Also known as ABS polymer and ABS terpolymer. The ABS resin is not a simple interpolymer of three components, but is a two-phase non-uniform structural blend of micro-dispersed rubbery polymers of BR, SBR, NBR, etc. in the continuous phase of the AS resin. The original ABS resin developed was a blend of AS resin and NBR. Grafting type of ABS resin is now its mainstream. In the United States and Japan all developed after the 1960s, and the demand is increasing year after year. Copolymerization: A butadiene/acrylonitrile emulsion was added to a styrene/acrylonitrile emulsion and then precipitated and polymerized. Graft copolymerization: Styrene and acrylonitrile are added to the polybutadiene emulsion. The mixture is then heated with stirring and a water-soluble initiator is added for polymerization. The graft-copolymerized ABS thus obtained has relatively high impact strength relative to the ABS obtained by copolymerization, but has low rigidity and hardness. Features Better impact strength and wear resistance. Good cold resistance, use temperature range -40 ~ 100 °C. Good oil resistance, water resistance and chemical stability. Good electrical properties, its insulation is rarely affected by temperature and humidity. Has good moldability, can color, can be electroplated, can bond. Non-toxic, odorless, impervious but slightly permeable to water vapor. The inadequacies are poor weather resistance, UV resistance, and low heat resistance. Use ABS has high strength and low density. Using it to make automotive parts, such as bumpers, can reduce fuel consumption and reduce pollution. The high strength of ABS is due to the fact that the nitrile groups on acrylonitrile are very polar and will aggregate with each other to bind the ABS chains together. At the same time, polybutadiene with rubber properties gives ABS good toughness. Therefore, ABS resin is widely used, mainly used in automobiles, aircraft parts, electrical and mechanical enclosures, air conditioners, refrigerators lining typewriters, camera shells, TV shell helmets, antenna amplifiers, lights and boards, tubes, rods and so on. Among them, electrical products account for 40%.