撞车后，为何车门总是打不开？

Core Viewpoint - The safety of electric vehicle doors has come under scrutiny following a collision incident involving a Xiaomi SU7 Ultra, raising consumer concerns about emergency access to vehicle interiors [1][2]. Group 1: Emergency Door Access Mechanism - The process of opening a car door involves two critical steps: unlocking the door lock and opening the latch [2]. - In the event of a collision, the airbag deployment triggers an emergency locking mechanism, which is designed to unlock the doors once the vehicle comes to a stop [3][5]. - The airbag system is a one-time use device, and if deployed, it requires replacement at a service center, costing approximately 10,000 yuan for a vehicle equipped with ten airbags [4]. Group 2: Locking Mechanism Reliability - The automatic locking mechanism may fail if the vehicle's electrical components are damaged during a collision, leading to difficulties in unlocking the doors [5][6]. - Manufacturers often implement redundant power sources and wiring to enhance the reliability of the locking mechanism, although this increases production costs [6]. Group 3: Mechanical vs. Electronic Door Handles - Traditional mechanical door handles provide a more reliable means of opening doors in emergencies compared to electronic handles, which rely on multiple electronic components [7][8]. - The recent trend towards electronic door handles, as seen in the Xiaomi SU7, raises concerns about their reliability in emergency situations [8][9]. - A proposed national standard by the Ministry of Industry and Information Technology mandates that both internal and external door handles must have a physical structure, which would make mechanical handles standard in future vehicles [9]. Group 4: Overall Safety Considerations - Regardless of the locking mechanism's functionality or the type of door handle, severe deformation of the door due to high-speed collisions can render both systems ineffective [10]. - The automotive industry is shifting focus back to fundamental safety features, emphasizing the importance of mechanical structures in vehicle design [10].