The working principle of dry batteries and the introduction of the classification of zinc manganese dry batteries

Dry battery working principle Dry battery is a chemical battery that uses paste electrolyte to generate direct current. It can be roughly divided into two types: primary battery and secondary battery. They are commonly used in daily life and are light batteries. Dry battery is a kind of primary battery in chemical power supply. It is a kind of disposable battery. Its carbon rod is used as the positive electrode and the zinc cylinder is used as the negative electrode, which converts chemical energy into electrical energy and supplies it to an external circuit. In the chemical reaction, because zinc is more active than manganese, zinc loses electrons and is oxidized, while manganese gets electrons and is reduced. Due to chemical changes in the dry battery, a lot of positive charges have accumulated on the carbon rods, and a lot of negative charges have accumulated on the surface of the zinc cylinders. Carbon rods and zinc cylinders are called electrodes of dry batteries, carbon rods that accumulate positive charges are called positive electrodes, and zinc cylinders that accumulate negative charges are called negative electrodes. The important working principle of the dry battery is that the oxidation-reduction reaction is realized in a closed loop, which is very similar to the primary battery, which is to convert chemical energy into electrical energy. The electrode reaction formula of alkaline zinc-manganese dry battery is: Zn+2MnO2+2NH4Clu003dZnCl2++Mn2O3+2NH3+H2O. Classification of zinc-manganese dry battery To make the surface properties more uniform, to reduce the corrosion of zinc, and to improve the storage performance of the battery. The positive electrode material is a mixed paste composed of manganese dioxide powder, ammonium chloride and carbon black. 2. Alkaline alkaline zinc-manganese battery is abbreviated as alkaline-manganese battery. It was successfully developed in 1882 and was developed in 1912. It was not put into production until 1949. It has been found that when KOH electrolyte solution is used instead of NH4Cl as the electrolyte, both the electrolyte and the structure have great changes, and the specific energy and discharge current of the battery can be significantly improved. Common zinc-manganese dry batteries include the following types: 1. Paste-type zinc-manganese dry batteries, which are composed of a zinc cylinder, an electro-paste layer, a manganese dioxide positive electrode, a carbon rod, and a copper cap. The outermost layer is a zinc cylinder with a carbon rod in the center; surrounding the carbon rod is a mixture of manganese dioxide powder and conductive material, which together with the carbon rod constitutes the positive electrode body of the battery. To prevent the evaporation of moisture, the upper part of the dry battery is sealed with paraffin or asphalt. 2. Cardboard-type zinc-manganese dry battery is improved on the basis of paste-type zinc-manganese dry battery. It is based on high-quality kraft paper that does not contain metal impurities. The surface is coated with a prepared paste, and then dried to make cardboard. The actual discharge capacity of cardboard-type zinc-manganese dry batteries is 2 to 3 times higher than that of paste-type zinc-manganese dry batteries. Most of the dry batteries marked with high performance are cardboard. There are usually two methods to detect whether the ordinary zinc-manganese dry battery is sufficient. The first method is to estimate the internal resistance of the battery by measuring the instantaneous short-circuit current of the battery, and then to determine whether the battery is sufficient; the second method is to use an ammeter in series with a resistor of appropriate resistance, and calculate the battery by measuring the battery's discharge current Internal resistance to determine whether the battery is sufficient. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.