Safety issues are related to the personal, property and quality of life of urban residents, as well as the image of the city. It is one of the important issues to be solved in the construction of smart city. With the promotion of smart city construction, the security industry is entering a new historical period. Security has become an indispensable part of smart city modules such as smart communities and smart buildings. Primary lithium battery has made great achievements in the field of security because of its irreplaceable characteristics such as high capacity and long life. At present, the primary lithium batteries represented by Ruiyi er9v, cp9v and er14335m are widely used in the field of smoke alarm