With the increasing popularity of electric vehicles, liquid lithium batteries in power batteries have the risk of fire caused by thermal runaway in application, and the charging speed is difficult to meet the needs of users for rapid energy replenishment, which restricts the further promotion of electric vehicles and the improvement of user experience. Based on this, this paper discusses the technical characteristics of the new solid-state lithium battery, its compatibility with the existing electric vehicle system, the current application bottleneck and its optimization strategy, from the perspective of material innovation and system integration, a feasible development path is proposed to provide a useful reference for the application optimization of solid-state batteries in electric vehicles.