With the acceleration of China's urban modernization, the reform of energy prices such as water, heat, electricity and gas has been the focus of the central economic work conference in recent years. Intelligent water gas thermoelectric meter is widely used because it can realize the functions of real-time energy measurement, remote meter reading, remote payment and so on. Lithium sub battery or lithium manganese battery is widely used as working and backup power supply in these instruments. At the same time, intelligent instruments such as flow meters and gas testers are gradually changing to disposable lithium batteries to meet the use requirements of long life. It can be said that the future development of intelligent instruments will have an increasingly close and inseparable relationship with disposable lithium batteries.