The thermal characteristics of the power battery for pure electric vehicle are analyzed by means of theoretical analysis and numerical simulation. Taking a soft pack of lithium-ion battery as the research object, the structure of liquid cooling board of power battery is optimized. The results show that increasing the number of runners can improve the heat dissipation effect of the cooling board. Increasing the cross-section area of runner can improve the heat dissipation effect of cooling board on high temperature area. Increasing the inlet velocity of cooling liquid can further reduce the temperature difference of the battery. The optimum conditions for heat dissipation are as follows, the number of runners is nine, the cross-section area of runner increased by 0.15 mm2, the inlet velocity of cooling liquid is 1.25 m/s.
With the proposal of China's dual carbon goals, the carbon emission reduction contribution of battery electric vehicles in use phase has gradually attracted the attention of the industry. At present, the method for calculating carbon emission reduction of battery electric vehicle in use phase is ambiguous and subjective. This study proposes an objective baseline determination method based on the curb weight parameters of vehicles, which is simpler and clearer. On the basis of baseline determination, an calculating model for carbon emission reduction of battery electric passenger vehicle in use phase is built, and the carbon emission reduction is calculated and analyzed. The analysis result shows that the carbon emission reduction of battery electric passenger vehicles in use phase in China presents a basic trend of "high in the east and low in the west, high in the south and low in the north". The vehicle types that make greater contribution to carbon emission reduction are Class A, Class A00 and Class B, and the contribution to carbon emission reduction is obviously related to vehicle age. In the future, the continuous increase in the production and sales of battery electric passenger vehicles will further enhance the contribution of battery electric passenger vehicles to carbon emission reduction.
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