Many of us may be familiar with backup batteries from our cellphones. In fact, it is used in many household appliances. There is no doubt that the advantages of backup batteries, such as high efficiency and light weight, are making them widely used. However, do you know, careless use, it will also make you "fire" upper body?
The spare battery has the advantages of light body, high efficiency and low temperature resistance (-40℃). The spare battery with 0.3mm thickness and the size of a postage stamp can be used continuously for more than 5 years. In recent years, the existing alkaline dry battery and manganese battery are being gradually phased out, which are widely used in many high-grade household appliances and mobile phones.
Unlike the zinc chloride and potassium hydroxide aqueous electrolytes of existing manganese batteries and alkaline dry batteries, the standby battery uses an organic solvent. The spare battery positive electrode is made of manganese dioxide, lead fluoride, sulfurous chloride and other materials. Compared with the zinc chloride used in the negative electrode of the battery, the lithium metal foil used in the negative electrode of the battery has a strong tendency of ionization and a large voltage difference between the positive and negative electrodes, which improves the working efficiency of the standby battery.
However, the standby battery often appears heating and burning in the process of use, which will affect the use of the main engine and burn the main engine to cause a fire. A number of home fires have been reported in Japan in recent years, caused by heating and burning backup batteries.
So why do backup batteries heat up and burn? After contact with water, many materials in the original standby battery can undergo violent chemical reactions and release a large amount of heat energy, leading to heating and combustion. The manganese dioxide in the positive electrode of the spare battery can be heated by just a small drop of water. After sulfurous chloride in the standby battery contacts with water, it releases heat energy while generating hydrochloric acid and sulfur dioxide. Several factors make the standby battery become the "kindling" in life, so people must pay attention to waterproof and moist-proof when using the standby battery. After the host is out of service, spare batteries should be taken off and placed in a dry, low temperature place for safekeeping, in order to prevent and avoid the occurrence of home fire accidents caused by improper use of spare batteries.
