Micro battery refers to the corrosion battery with cathode and anode provided by the same steel bar. The anode is the non rusted part of the steel bar, and the cathode is the oxide of iron on the steel bar. Macro battery refers to the corrosion battery with cathode and anode provided by different steel bars. The anode is the non rusted steel bar, and the cathode is the rusted part of the rusted steel bar.
Microbattery micro cell, developed with the miniaturization of electronic components, especially the emergence of transistors and integrated circuits, is characterized by small size, high specific energy, stable operating voltage, good sealing, small self discharge and high reliability Battery 。 It is commonly known as button battery. Micro battery is usually composed of positive pole, negative pole electrolyte solution , diaphragm and sealing parts. There are many tiny cathodes and anodes on the whole metal surface, which forms many tiny galvanic cells. These tiny galvanic cells are called micro cells. The cells constantly react to generate corrosion products, namely electrochemical corrosion
Micro batteries can be divided into two categories. One is micro alkaline battery, including silver oxide battery, mercury battery Zinc air battery , zinc nickel battery, zinc manganese battery, cadmium nickel battery, cadmium mercury battery, etc; The other is micro lithium batteries, including more than ten kinds of lithium manganese batteries, lithium thionyl chloride batteries, lithium chromic acid batteries, lithium iron sulfide batteries, etc. The negative poles of these batteries are Lithium metal , so it is called lithium battery. Lithium batteries use organic solvents as electrolyte, such as lithium manganese batteries; Some use inorganic solvent as electrolyte, such as lithium- Thionyl chloride Battery; Some also use solid electrolyte, such as lithium iodine battery. Micro battery can also be divided into primary and secondary batteries, which are called micro primary battery and micro battery respectively. Since the problem of alkali creep (leakage) of micro battery has not been solved Alkaline battery The service life of shall not exceed 10 years. The button type zinc silver oxide battery, or silver oxide battery for short, is the most widely used and used micro battery. Silver oxide batteries include silver oxide (Ag2O) as positive electrode, silver oxide (AgO) as positive electrode and button type silver oxide batteries. See the table for its basic performance. Compared with silver oxide battery, lithium battery has the advantages of wide voltage range, good sealing, long storage life, wide temperature range, and suitable for miniaturization and thinness. The disadvantage of lithium battery is that its current output capacity is small, but due to vlsi With the rapid development of, the power consumption of microelectronic devices has been further reduced, so this disadvantage of lithium batteries is no longer prominent. Since the 1980s, lithium batteries have gradually replaced silver oxide batteries, which are widely used. 
