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The battery manufacturing process involves several key steps, including assembling the anode and cathode, inserting a separator, applying seals, and creating a label. Different types of batteries, such as alkaline, lithium, and carbon-zinc, will undergo a slightly different battery manufacturing process. This is due to the varying nature of the materials and structure, both of which have a large impact on the method of battery production.
Alkaline batteries are the most common, and they are frequently used in devices such as toys, calculators, and recorders. The structural materials used in the alkaline battery manufacturing process include steel plated with nickel, a porous material for the separator, and brass and epoxy for the seals. In alkaline batteries, the cathode also forms a structural component of the battery, known as the cathode can, due to its cylindrical shape.
The first step is to degrease and coat the cathode can to improve conductivity. Next, the actual cathode substances are added, which include carbon powder and manganese dioxide powder, sometimes compressed into round blocks. A hollow and porous separator, which is often made out of cross-laid paper, is introduced into the cylinder to keep the anode and cathode substances separate from each other. The electrolyte solution is either poured into the center of the separator or the separator is soaked in the electrolyte before being placed in the battery.
Inside the hollow made by the separator, an anode gel containing zinc suspended in an alkaline solution is injected to fill the cavity. The anode terminal, also known as the current collector, is then placed on the end to complete the circuit. Lastly, the battery is sealed with an epoxy material, brass nail, or steel plate, finishing off the battery manufacturing process. Additional steps include placing a label on the battery’s surface and inspecting the battery for safety and effectiveness.
Other battery types have slightly different manufacturing processes. In carbon-zinc batteries, there is a zinc can that acts as the anode rather than the cathode. The separator and bottom paper are inserted first, and the cathode powder is poured in afterward. A rod made out of carbon is then inserted to carry the current, and the entire apparatus is coated in a resin tube before labeling. The lithium battery manufacturing process is also very similar to the alkaline process, but it involves stricter separation of the cathode and anode materials due to their increased reactivity.