It can be modified or purchased as a finished product.
1, mobile phone USB charging voltage is 5V, electric vehicle voltage 36\/48\/60V and so on, the two do not match.
2, it is necessary to install a DC\/DC converter to convert the high voltage of the electric vehicle to 5V low voltage and USB output.
3, at present, there are specialized products on the market to buy finished products, if you have relevant electronic knowledge, you can make your own.