With the development of microelectronics technology in the 20th century, the number of miniaturized equipment is increasing, which puts forward high requirements for power supply. Lithium battery has entered the large-scale practical stage.

　　Lithium sub primary batteries were first used in cardiac pacemakers. As the self discharge rate of lithium sub battery is extremely low, the discharge voltage is very gentle. It is possible to implant pacemaker into human body for long-term use.

　　Lithium manganese battery generally has a nominal voltage higher than 3.0 volts, which is more suitable for use as an integrated circuit power supply, widely used in computers, calculators, watches.

　　Now, lithium-ion batteries are widely used in mobile phones, laptops, electric tools, electric vehicles, street lamp backup power, aviation lamps, and small household appliances, which can be said to be the largest application group.

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