Electric bicycles play an important role in solving the "last one mile" of daily travel. Also known as e-bikes, they have a wide market around the world with annual sales of over 35 million, though current modules primarily use lead-acid batteries. With the increase in environmental protection requirements and the decrease in the cost of Li-ion batteries, it has become a trend to switch electric bicycles from lead-acid batteries to Li-ion batteries. Lighter, more environmentally friendly and durable electric bicycles equipped with Li-ion battery will be accepted by more and more people.