Device, method and system for improving cruising ability of electric vehicle

The invention belongs to the technical field of electric vehicles, and particularly relates to a device, a method and a system for improving the cruising ability of an electric vehicle. The method comprises the following steps: a driver queries nearby quick-change stations through a driver terminal, carries out selection, and transmits the information of the selected quick-change station to a management platform; after receiving the quick-change station information, the management platform generates a navigation map and feeds back the navigation map to the driver terminal to provide navigationfor the driver; the driver delivers a rechargeable battery with exhausted electric quantity on the electric vehicle to the quick-change station, and exchanges for a rechargeable battery with full electric quantity from the quick-change station; a detachable external battery is arranged on the electric vehicle and comprises one or more rechargeable batteries connected in series; and after the battery is replaced, the driv