针对新能源汽车与储能系统 800~1500 V 高压平台对高压直流接触器提出的小型化、无极性、高抗短路、状态监测及高可靠性应用需求，本文以 Cassie 电弧模型与磁吹灭弧理论为基础，通过优化弧面触点结构与磁吹路径提升灭弧性能；借助多物理场仿真与自研抗短路电磁斥力抵消结构增强短路耐受能力；通过优化磁路与线圈参数、重构脉冲宽度调制（Pulse Width Modulation，PWM）智能驱动算法，降低线圈功耗与温升；优化绝缘爬电路径以适配高海拔、低温等极端工况；创新设计辅助触点一体化结构，并配套采用陶瓷真空钎焊、填料烧结等特种工艺；最终研制出一款大电流、小型化、高可靠的陶瓷密封高压直流接触器，实现无极性分断与辅助触点实时状态监控。该产品已获发明专利授权，通过全套型式试验并完成实车搭载验证，可为高压直流接触器的正向结构设计提供完整工程参考。

In response to the demands for miniaturization, non-polarity, high short-circuit resistance, state monitoring, and high reliability of high-voltage DC contactors for the 800~1500 V high-voltage platform of new energy vehicles and energy storage systems, this paper is based on the Cassie arc model and magnetic blowout arc extinguishing theory. It optimizes the arc surface contact structure and magnetic blowout path to improve the arc extinguishing performance, uses multi-physics field simulation and a self-developed anti-short-circuit electromagnetic repulsion cancellation structure to enhance short-circuit tolerance, optimizes the magnetic circuit and coil parameters, and reconstructs the Pulse Width Modulation (PWM) intelligent drive algorithm to reduce coil power consumption and temperature rise; optimizes the insulation creepage path to adapt to extreme conditions such as high altitude and low temperature; innovatively designs an integrated auxiliary contact structure, and adopts special processes such as ceramic vacuum brazing and filler sintering. Finally, a large current, miniaturized, and highly reliable ceramic sealed high-voltage DC contactor is developed, achieving non-polarity breaking and real-time state monitoring of the auxiliary contacts. This product has been granted an invention patent and has passed a complete type test and real vehicle installation verification, providing a complete engineering reference for the forward structure design of high-voltage DC contactors.