1. Meet the space requirements of the vehicle, the parts of the chassis and the space for placing the battery pack.

2. Meet the requirements of the vehicle's pure electric mileage, that is, how many kilowatt-hours of electricity should be designed for this battery pack.

3. Select the battery, including the form of cell, square shell, soft package or cylinder, the capacity of each cell.

4. Understand the working voltage range of other electrical appliances in the vehicle, which determines that the cells of the battery pack are in series and series. BMS will have requirements for the series and parallel connection of the cells when monitoring the cells of the battery package.