Reliability and Process Requirements for PCBA in the New Energy Vehicle Industry

I.Amid the wave of intelligent and electric new energy vehicles, PCBA has become a core component of vehicle electronic control systems, covering key modules such as Battery Management Systems (BMS), in-vehicle infotainment systems, Advanced Driver Assistance Systems (ADAS), motor controllers and on-board chargers. The value of PCBA per vehicle has risen significantly, making it a vital cornerstone of automotive safety.

II.The primary distinction between automotive-grade PCBA and consumer-grade PCBA lies in their ability to withstand harsh environments and their exceptional reliability. They must operate within a wide temperature range of -40°C to 150°C and endure complex operating conditions such as severe vibration, high humidity, and oil contamination and corrosion, whilst strictly adhering to the IATF 16949 system and AEC-Q100 automotive certification standards. Taking the BMS (Battery Management System) PCBA as an example, it must collect voltage and temperature data from hundreds of battery cells in real time, perform data calculations and balancing control within milliseconds, and maintain accuracy to the milliampere level to prevent risks of overcharging, over-discharging and thermal runaway. The ADAS domain controller PCBA must support parallel processing of multiple camera and radar signals, utilising a dual-power-supply redundancy design to ensure driving safety under extreme conditions.

III.In terms of manufacturing processes, automotive PCBA typically utilises 6–8-layer thick copper-clad laminates to enhance insulation and current-carrying capacity. Key components are secured during mounting and protected with triple-proof coatings to improve resistance to shock, moisture and corrosion. The production process involves high and low temperature cycling tests, vibration tests, salt spray tests and ageing durability tests. Component batch numbers and production data are tracked throughout the entire process to ensure fault traceability. With the widespread adoption of 800V high-voltage platforms, higher demands are placed on PCBA insulation voltage withstand, creepage distance and heat dissipation capabilities; high-voltage isolation processes and highly thermally conductive substrates have become standard features.

VI.Driven by current industry trends, the explosive demand for smart cockpits, autonomous driving domain controllers and in-vehicle connectivity modules is compelling PCBA evolution towards higher integration, higher voltage resistance and greater computing power. Automakers and PCBA manufacturers are engaging in deep collaboration to optimise layouts and mitigate electromagnetic interference from the design stage onwards, thereby laying a robust hardware foundation for the safe, intelligent and long-lasting operation of new energy vehicles through stringent automotive-grade standards.