Due to the small size of the button battery, it has been widely used in various microelectronic products. Such as cardiac pacemakers, electronic hearing aids, electronic watches, counters, cameras, etc. Button batteries are also divided into chemical batteries and physical batteries, and their chemical battery applications are the most common. They are composed of an anode (positive electrode) agent, a cathode (negative electrode) agent, and an electro-contact thereof. As shown in Figure 134. Its appearance is stainless steel, and it is used as a positive electrode. Its negative electrode is a stainless steel round cover. The positive and negative electrodes are insulated by a sealing ring. The sealing ring is made of nylon. The sealing ring can prevent electrolyte leakage in addition to insulation. . There are many types of button batteries, most of which are named after materials used, such as silver oxide batteries, button batteries, and alkaline manganese batteries. Here are a few common button batteries. 1) Silver oxide battery, which has the characteristics of long service life and large capacity, and is widely used, and its application force is the largest. The battery has silver oxide as a positive electrode, metal zinc powder as a negative electrode, and an electrolyte solution of potassium hydroxide or sodium hydroxide. Electrical energy is generated by the chemical action of zinc and silver oxide. The thickness (height) of the silver oxide button battery is available in five sizes: 5.4mm, 4.2mm, 3.6mm, 2.6mm, and 2.1mm. The diameters are 11.6mm, 9.5mm, 7.9mm, and 6.8mm. When choosing, you should choose one of them according to the size of its position. Commonly used models are AG1, AG2, AG3, AG1O, AG13, SR626, etc., its model AG is Japanese standard, and SR is an international standard model. 2) Silver peroxide button battery, which has the same structure as the silver oxide button battery. The main difference is that the anode (drain) of the battery is made of silver peroxide. 3) Hammer button battery, which has the characteristics of high energy density, good storage performance, small self-discharge and long life. The disadvantage is that the internal resistance of the battery is large. The positive electrode of the battery is made of manganese dioxide or iron disulfide, the negative electrode is a hammer, and the electrolyte is organic. The nominal voltage of the Li/MnO hammer battery is 2.8V, and the nominal voltage of the Li(CF)n hammer battery is 3V. 4) Alkaline manganese button battery, which has large capacity and excellent low temperature performance, and the material used is cheap and low in price, and can meet the requirement of continuous discharge with large current demand. The disadvantage is that the energy density is not enough and the discharge voltage is not stable enough. The positive electrode of the battery is manganese dioxide, the negative electrode is zinc, and the potassium hydroxide for the electrolyte has a nominal voltage of 1.5V. 5) Mercury button battery, also known as mercury battery, has the characteristics of being able to be used under high temperature conditions, long-term storage, stable discharge voltage and good mechanical performance. However, its low temperature characteristics are not good. The positive electrode of the battery is mercury, the negative electrode is zinc, and the electrolyte may be potassium hydroxide or sodium hydroxide. Its nominal voltage is 1.35V.
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