The batteries produced in the 1950s are mainly wooden separators, which need to be used in a humid environment. The initial charging time of the batteries is long and cannot be used in dry-type lead storage batteries. Especially the wooden partitions are not corrosion resistant and the battery life is short. Although the application of wood partition and glass wool can double the battery life, the internal resistance increases, which also has an adverse effect on the capacity and start-up discharge, which can meet the standard requirements of the time.

The microporous rubber separator of the present invention in the mid-1960s has good acid resistance and oxidation resistance, and the battery life is greatly extended. Improve the battery structure, reduce the center distance of the electrode plate, and significantly improve the battery start-up discharge performance and volumetric energy.

From the 1970s to the early 1990s, it became the main battlefield for the industrial production of lead-acid batteries with excellent performance. The disadvantage is that the impregnation speed of the electrolyte is slow, except for the tropical zone, the manufacturing process is complicated and the cost is high. In addition, sintered PVC separators were also used in the microporous rubber separators to produce thin (thickness less than 1 mm) finished products, and then soft P-oxyethylene separators appeared. This type of partition is almost no different from the 80s, but the sales in the 80s are pretty good.

The price of rubber microporous separators increased, leading to insufficient supply of PVC separators in 1993. In the 1990s, polypropylene separators, polyethylene separators, ultra-fine glass fiber separators and their composite separators appeared one after another. There are also fiber paper separators, which have good electrical resistance and porosity, but they cannot be used on a large scale due to corrosion resistance, poor mechanical strength, and large pore size. Currently, it cannot be used on a large scale. At present, a large number of polyethylene bag separators are used in automobile batteries in the United States and Western Europe. The polyethylene separator has a small pore size, a small resistance, a very thin foundation, and is easy to form into a bag, which is suitable for continuous battery production. However, there is currently no large-scale domestic production in China, and the production lines (including combined machines) supporting separators are also limited, and the scope of application is not wide; automobile battery manufacturers have gradually begun to use polypropylene separators and 10-G.