新能源混动汽车高压系统易对传统低压电气回路形成干扰威胁，本文选取燃油泵低压线束为研究对象，梳理油泵完整电气链路结构，剖析油泵启动高频冲击电流诱发低压线束导体、绝缘失效的内在机理；结合线束载流量与过流校核设计逻辑，依托实车案例量化评估过流热损伤风险，建立一套低压线束冲击过流风险分析流程，并针对混动车型油泵链路各电气零部件给出配套设计耐久寿命指标。

The high-voltage system of new energy hybrid vehicles is prone to pose interference threats to the traditional low-voltage electrical circuits. This paper selects the low-voltage wiring harness of the fuel pump as the research object, examines the complete electrical circuit structure of the oil pump, and analyzes the internal mechanism by which the high-frequency impact current of the oil pump triggering failure of the low-voltage wiring harness conductors and insulation; combined with the current-carrying capacity of the wiring harness and the overcurrent verification design logic, it quantitatively assesses the risk of overcurrent thermal damage based on real vehicle cases, establishes a set of risk analysis process for impact overcurrent of the low-voltage wiring harness, and provides corresponding design durability life indicators for each electrical component of the oil pump link in the hybrid vehicle model.