The Development History of Power Batteries

　　Power batteries are the power sources that provide power for tools. Based on the characteristics, requirements, and application fields of power batteries, the development of power batteries has gone through the following four stages

　　(1) Lead acid batteries are mainly divided into several categories: open end, maintenance free, glass fiber partition adsorption valve controlled sealing (AGM), valve controlled adhesive type, etc. Their main advantages are abundant resources, low price, good current charging and discharging performance, high battery recovery rate, and the disadvantage is that the main materials contain lead elements that are polluting to the environment and have a low mass to energy ratio

　　(2) Alkaline batteries, such as Cd Ni batteries and MH Ni batteries. Due to cadmium being toxic and not conducive to environmental protection, Cd Ni batteries have been banned from use in power batteries in accordance with the EU's requirements for reducing harmful substances (ROHS). MH Ni batteries, as an alternative system to traditional nickel cadmium batteries, have become one of the hotspots in the development of secondary batteries in countries around the world due to their excellent performance

　　(3) Lithium ion batteries (LIB) and polymer lithium-ion batteries (PLIB) have high energy density, a mass to energy ratio of 200W · h/kg, a single cell voltage of 3.6V, and no memory. They have become hot research topics

　　(4) Proton exchange membrane fuel cells (PEMFC) and direct methanol fuel cells (DMFC) are truly electrochemical reaction devices that use H2 or methanol as fuel and O2 as oxidant to directly convert it into electricity, as the discharge product is water and the entire process is pollution-free. However, they still need to consume the electricity provided by mineral fuels

　　In order to solve the pollution problem caused by fuel as a power source for automobiles, electric vehicles powered by batteries and hybrid electric vehicles have become research hotspots in countries around the world. The development and performance improvement of power batteries are the key to the success or failure of research work

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