What is the working principle of dry battery? How to distinguish the pros and cons of dry batteries

Dry battery working principle Dry battery belongs to the primary battery in the chemical pole 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. The chemical energy is converted into electrical energy to supply the 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. Battery discharge is the electrolysis reaction of ammonium chloride and zinc. The charge released is conducted by graphite to the positive electrode carbon rod. The electrolysis reaction of zinc will release hydrogen gas, which will increase the internal resistance of the battery. The manganese dioxide mixed with graphite is used to absorb hydrogen. But if the battery continues to work or is used for too long, the manganese dioxide will be too late or nearly saturated and unable to absorb it. At this time, the battery will lose its use due to too much internal resistance and too little output current. But at this time, if the battery is heated or left for a period of time, the accumulated hydrogen gas inside it will be heated or slowly released, and the manganese dioxide will also be reduced and restored, and the battery will be vigorous again. How to distinguish the pros and cons of dry batteries 1. Weigh dry batteries of the same brand and specifications on an electronic scale. A good-quality battery is much heavier than a poor-quality battery. For example, the AA battery in the alkaline battery generally weighs about 23 grams, and the AA battery generally weighs about 11 grams. While the No. 5 carbon battery weighs about 16 grams, the alkaline battery in the hand is significantly heavier than the carbon battery. 2. Look at the high-priced dry batteries, which are generally alkaline batteries with relatively better quality. Don’t try to buy batteries cheaply from unlicensed and unlicensed vendors. These batteries are not only short-lived, but also have potential risks of leakage and environmental pollution. 3. Check dry batteries with good appearance. The packaging will indicate the trademark, manufacturer, battery model, nominal voltage, battery polarity, production date, shelf life, and implementation standard number, and the workmanship is exquisite, neat and clean, and there is no leakage. When purchasing, you can also check whether the goods are marked with no mercury, 0% mercury, and no mercury added. 4. Look at the logo Dry batteries are divided into alkaline and carbon. Alkaline dry batteries are marked with alkaline or ALKALINE, and carbon dry batteries are marked with carbon. Alkaline batteries are much higher than carbon batteries in terms of capacity, shelf life, and reliability. Dry batteries are primary batteries in chemical power sources and are a kind of disposable batteries. Because the electrolyte of this kind of chemical power supply device is a kind of non-flowable paste, it is called a dry battery, which is related to a battery with a flowable electrolyte. Dry batteries are not only suitable for flashlights, semiconductor radios, tape recorders, cameras, electronic clocks, toys, etc., but also for various fields in the national economy such as national defense, scientific research, telecommunications, navigation, aviation, and medicine. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Introduction to the advantages and application areas of high-rate lithium-ion batteries