1. Classification of electric bicycles 1. According to the battery type, electric bicycles can be divided into lead-acid battery electric bicycles and lithium ion battery electric bicycles. 2. Electric bicycles are divided into drive modes: generally hub drive and mid-drive (middle motor), and hub drive can be divided into rear-wheel drive and front-wheel drive. 3. For the placement of the battery, it is better to place the battery in a diagonal tube or a straight tube from the perspective of the balance of the vehicle and the convenience of getting on and off the vehicle. At present, the batteries used are basically economical lead-acid batteries. As for the size of the battery. Currently, 48V/12Ah, 36V/10-12Ah, 24V/8Ah electric bicycles are basically used. 2. Electric bicycle style 1. Simple type: According to GB17761-1999 general technical conditions of electric bicycles, the motor power of this type of electric bicycles (Figure 1) is generally 150W-180W, especially the shape is smooth, and the continuous mileage is 40-50 kilometers. The operation is simple, the price is moderate, and it is more suitable for users who have a long commute distance and a certain degree of mobility in work and life. 2. This type of electric bicycle (Figure 2) generally adds front fork shock absorbers, cushion shock absorbers, headlights and other devices on the basis of simple models. It is characterized by more complete functions, more comfortable riding, and more convenient use. .