Blog

Industry Trend

How do we avoid “The Day After Tomorrow” happening in real life? Trends for Global Electric Vehicles to reduce Carbon emissions

In response to global warming and resources shortages, in order to promote environmental sustainability and pursue the goal of a low-Carbon society, governments in every country have considered that electric vehicles have the advantages of low noise and zero exhaust emissions, and have encouraged car manufacturers to expand their investment in electric vehicles. They offer subsidies for purchasing electric vehicles, as well as tax credits. Some countries’ governments, such as Norway and the Netherlands, have even taken the role of the bellwether and are leading the charge to ban petrol and diesel cars from 2025. Taiwan’s government is aiming to ban sales of fossil fuel vehicles by 2035, accelerating the development of electric vehicles.

After sales of electric vehicles hit the millions threshold worldwide in 2015, it has massively impacted the traditional transportation market with a sales growth rate of more than 50% every year. Despite the continuous growth in the number of electric vehicles in the past few years, the global electric vehicles market size is limited compared to traditional fossil fuel vehicles. Currently, electric vehicles only account for 0.2% of total private vehicle sales. In general, there are two weaknesses for electric vehicles – range and charging time. Compare the Toyota Altis, the bestselling car in Taiwan with the Tesla Model 3, the world highest-selling electric car, the Toyota Altis has a range of about 750 kilometers, but the range of the Tesla Model 3 is about 450 kilometers, a 67% range gap. As for the charging time, it takes less than 10 minutes to fill up the fuel tank of a standard gasoline car, and Tesla Supercharging stations take about 30 minutes to charge to 80%, making the time cost quite high. Therefore, the development of electric vehicles will focus on shortening the charging time and increasing the range in the future. The range and charging time of electric vehicles are closely related to the working temperature.

 

Tesla utilizes up to 7,000 small, cylindrical lithium-ion batteries.

For example, in a Tesla, if the temperature of the battery exceeds 113.1ºF (45ºC) during charging, a protection mechanism will be activated to reduce the input power by 25%. This will directly lead to a significant increase in charging time. In the meantime, it is necessary to control the temperature difference between the highest temperature and the lowest temperature of more than 7,000 lithium-ion batteries within 5 ºC to ensure the chemical stability of the lithium battery, and this is all related to the optimization of heat dissipation.

Editorial staff T-Global Marketing


Author

Professor Wei-Keng Lin

Education|Ph.D., University of Maryland

Occupation|Professor, National Tsing Hua University 

Specialty|Electronic package heat dissipation, Heat pipe, Loop heat pipes(CPL,LHP,PHP), Energy-saving design, Solar heat storage and cooling, Heat flow system, Cooling of electronic components, Two-phase flow, Heat transfer elements of artificial satellite and high-altitude flying object

TOP