Abstract: On the basis of thorough research, combined with the case of electric vehicle fires and the research results of others, this study conducted a detailed analysis of the fire protection design of a sunken well type mechanical parking garage in use. It was found that there are main risks such as the inability to separate fire protection units, inaccurate fire linkage, uncertain fire extinguishing efficiency, and difficulty in accident disposal. Through theoretical research and comparative data analysis, early warning detection, fire separation, graded response, structural fire resistance, and fire rescue are proposed. This study provides a basic idea for the next step of conducting relevant physical experiments, fire protection design, and specification revision.

Key words: sinking well type mechanical three-dimensional parking garage, electric vehicle, lithium battery, fire risk, prevention strategies