针对新能源汽车高压连接系统关键电连接点的载流温升问题，本研究搭建了包含直流电源、恒温仓及数据采集设备的测试台架，选取 380 V 高压与 15 V 低压两种工况，对主回路、电驱回路等共 4 组同电流工况开展载流温升对比试验。结果显示：各组高低压温升差值仅为 0.02~0.69 K，小于设备 1 K 的采样误差；系统最高温升达 48.87 K，峰值温度为 112.87 ℃，均满足国家标准及零部件温度限值要求。研究表明，在相同电流条件下，外加电压等级对高压连接系统载流温升的影响可忽略不计。

This study focuses on the current-carrying temperature rise issue of the key electrical connection points in the high-voltage connection system of new energy vehicles. A test bench was set up, including a DC power supply, a constant temperature chamber, and data acquisition equipment. Two working conditions of 380 V high voltage and 15 V low voltage were selected to conduct comparative tests on four groups of the same current conditions of the main circuit and the electric drive circuit. The results show that the temperature rise difference between high and low voltages in each group is only from 0.02 to 0.69 K, which is less than the sampling error of 1 K of the equipment; the maximum temperature rise of the system reaches 48.87 K, and the peak temperature is 112.87 ℃ , all meeting the national standards and temperature limit requirements of components. The study indicates that under the same current conditions, the influence of the added voltage level on the current-carrying temperature rise of the high-voltage connection system can be ignored.