How dry batteries work

The dry battery belongs to the primary battery in the chemical power supply, which is a disposable battery, which uses the carbon rod as the positive electrode and the zinc cylinder as the negative electrode to convert chemical energy into electrical energy to supply the external circuit. In chemical reactions, because zinc is more active than manganese, zinc loses electrons and is oxidized, and manganese gets electrons and is reduced. Dry batteries are not only suitable for flashlights, semiconductor radios, tape recorders, cameras, electronic clocks, toys, etc., but also suitable for special fields, scientific research, telecommunications, navigation, special use, medicine and other fields in the national economy, which are very easy to use.

Generally, most dry batteries are manganese-zinc batteries, with a cathode carbon rod in the middle, a mixture of graphite and manganese dioxide, and a layer of fiber mesh outside. The net is coated with a thick electrolyte paste, which consists of ammonia chloride solution and starch, and a small amount of preservatives.

The important working principle of dry batteries is that the redox reaction is realized in a closed loop. The electrode reaction formula of alkaline zinc-manganese dry battery is: Zn+2MnO2+2NH4Cl=ZnCl2++Mn2O3+2NH3+H2O

What is the dry battery model?

The models of dry batteries are generally divided into: 1, 2, 3, 5, and 7, of which No. 5 and No. 7 are particularly commonly used. The so-called AA battery is the No. 5 battery, and the AAA battery is the No. 7 battery! AA and AAA both indicate the battery model; With the development of science and technology, dry batteries have developed into a large family, with about 100 species so far. Common ones include general zinc-manganese dry batteries, alkaline zinc-manganese dry batteries, magnesium-manganese dry batteries, zinc-air batteries, zinc-mercury oxide batteries, zinc-silver oxide batteries, lithium-manganese batteries, etc.

AA is what we usually call No. 5 battery, the general size is: diameter 14mm, height 49mm;

AAA is what we usually call No. 7 batteries, and the general size is: diameter 11mm, height 44mm.

What is the voltage of a dry battery?

The voltage value of the dry battery is expressed in volts (V), also known as potential difference or potential difference, which is the energy difference caused by the difference in the electric potential of the positive and negative electrodes of the power lithium battery in the electrostatic field, and the voltage of the dry battery is a variable process in the environment of the dry battery.

Dry battery voltage is divided into three types: standard voltage, open circuit voltage, and working voltage. General batteries are 1.5V, cadmium-nickel or nickel-metal hydride rechargeable batteries are 1.2V, there are also cylindrical lithium-ion batteries 3.7V, storage batteries 2V, etc., and Europe also has a zinc rechargeable battery 1.9V.