Sales of electric two-wheelers in the world's major economies have grown rapidly in the past five years, driven by emission reduction policies and advances in motor and battery technology. Total global sales of electric two-wheelers rose from 35.2 million in 2017 to 65.6 million 2021, a compound annual growth rate of 16.9 percent. From 2020 to 2022, more and more people are choosing to travel by bike as a healthy and green way to get around. In particular, the demand for short-distance transport such as two-wheeled electric vehicles has increased greatly in Europe, the global market for two-wheeled electric vehicles has maintained steady growth. Preliminary statistics, the global two-wheel electric vehicle sales will reach 74 million in 2022, China has about 360 million electric bicycles.
However, electric bicycle charging safety risks are increasing year by year. According to the Fire Rescue Bureau of the State Emergency Management Ministry, the 2021 received nearly 18,000 reports of fires caused by failures of electric two-wheelers and their batteries. In the first half of 2022, there were 8,370 fires involving electric two-wheelers, up 31.3% year on year. At present, the number of electric two-wheelers in our country has reached 360 million, which is equivalent to one electric two-wheeler for every four people in the country, according to the average frequency of charging once every two days, 180 million recharges a day. However, such a huge charge demand, but is always faced with charging insecurity, charging difficulties and other pain points, including the safety issue hanging in the way of its development of the “Damocles.”.
At present, there are three charging modes for two-wheeled electric vehicles: traditional socket charging, internet of things (iot) charging and intelligent power exchange. The traditional way of charging socket is still widespread, improper use of lead to serious impact on the community, property safety of public events occur from time to time. According to the fire department statistics, electric two-wheeled vehicle caused by the fire, 80% are due to electric vehicle battery overcharge caused.
For lithium-ion batteries, long-term charging can also be caused by excessive temperature explosion. When recharged indoors or in the hallway, batteries spontaneously ignite or explode, often igniting other parts of the body and releasing large amounts of toxic fumes.
Second, battery failure can also lead to safety hazards.
Third, charger failure. At present, the national standard of Charger has been implemented, but there are a lot of cheap, good and bad quality of the Charger;
fourth, the battery and Charger does not match.
Fifth, man-made modification factors.
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