Structural lithium power batteries typically come in two shapes: cylindrical and rectangular. The interior of the battery adopts a spiral wound structure, which is separated by a very fine and highly permeable polyethylene film isolation material between the positive and negative electrodes. The positive electrode includes a lithium collector composed of lithium and cobalt dioxide, and a current collector composed of aluminum film. The negative electrode is composed of a lithium collector made of flake carbon material and a current collector made of copper thin film. The battery is filled with an organic electrolyte solution. In addition, safety valves and PTC components are installed to protect the battery from damage in abnormal states and output short circuits. The voltage of a single lithium battery is 3.6V, and its capacity cannot be infinitely large. Therefore, single lithium batteries are often processed in series or parallel to meet the requirements of different occasions. With the development of microelectronics technology in the 20th century, the number of miniaturized devices is increasing, which puts forward high requirements for power supplies. Lithium power batteries have subsequently entered a large-scale practical stage. It was first applied in cardiac pacemakers. Due to the extremely low self discharge rate of lithium power batteries, the discharge voltage is gentle. Making it possible for pacemakers to be implanted into the human body for long-term use. Lithium power batteries generally have a nominal voltage higher than 3.0 volts, making them more suitable for use as integrated circuit power supplies. Manganese dioxide batteries are widely used in computers, calculators, cameras, and watches. Lithium power batteries are widely used in mobile phones and can be said to be the largest application group. For example: 1. There are many battery packs used as replacement products for battery pack maintenance, such as those used on laptops. After maintenance, it was found that only a few batteries had problems when this battery pack was damaged. Suitable single lithium batteries can be selected for replacement. 2. The author used a single 3.6V1.6AH lithium battery and a white ultra high brightness LED to create a miniature flashlight, which is convenient to use and compact and beautiful. Moreover, due to the large capacity of the battery, it is used for an average of half an hour every night and has been in use for over two months without the need for charging. 3. Replace the 3V power supply. Due to the voltage of a single lithium battery being 3.6V. Therefore, just one lithium battery can replace two ordinary batteries to power small household appliances such as radios, walkman, cameras, etc. It is not only lightweight, but also has a long continuous use time