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On the 22nd of the month, a hybrid bus caught fire in Xiamen, causing 11 buses to be burned down and 1 person to die. According to the police investigation, it was determined that the spontaneous combustion was caused by an electrical fault in the battery pack at the rear of one bus, and the fire quickly spread, causing other buses parked in the same row to catch fire. In addition, the recent incidents of the Wuzhoulong electric bus fire in Shenzhen and the Nanjing electric bus fire have raised public concerns about the safety of new energy vehicles.
How to avoid similar accidents from happening? In addition to strengthening product quality assurance for electric vehicle companies, various technical standards in this new field must also be established. Wu Changshun, director of the National Wire and Cable Quality Supervision and Inspection Center (TICW), said that traditional cars have safety level cable standards, but in the era of electric vehicles, these standards cannot fully guarantee the safety of electric vehicles. Due to changes in the power system of electric vehicles, the voltage and current transmitted by related wires and cables are completely different from those of traditional cars. If the wire and cable standards of traditional cars are still used, the probability of fire and electric shock accidents will greatly increase. So, recently TICW, in collaboration with China Quality Certification Center (CQC) and German DEKRA Quality Certification Co., Ltd. (DEKRA), jointly released the 'Cable Standard K175/CQC1103-1105 for Electric Vehicle Charging Equipment'. In the future, new standards for electric vehicle wires and cables will be gradually formulated and released to promote the safety and convenience of electric vehicle wires and cables. In the event of safety accidents involving electric vehicle charging stations in the future, relevant responsibilities can also be investigated and determined based on the standards.
Xie Zhiguo, Deputy Director of Product Certification Department 4 of China Quality Certification Center (CQC), told Electric Power Network that the interface standard for electric vehicle charging piles has been released in 2011, and the revised version of the new national standard has been completed. The 2015 or 2016 version will be released soon. The release of this national standard is mainly aimed at solving compatibility and safety issues between future electric vehicles and charging stations. However, there are still wires and cables at both ends of the charging interface. The revision process of the new national standard for charging interfaces also consulted relevant standards for wires and cables, because the real risk of electric vehicle fire and electric shock is not only on the interface, but also on the cable, which is an important link, especially for DC high-voltage fast charging. The charging current is much higher than the current transmitted by ordinary electrical wires and cables. If the cable does not meet the standard, it is easy to cause a fire accident. So the electric vehicle charging cable standard launched this time will first incorporate charging pile cables into a standard system from the aspects of safety and testing standards, which can not only provide a unified standard for manufacturing enterprises as a reference, but also safeguard quality and safety.
At present, most electric vehicle charging station cables on the market are orange. Will orange become the unified standard in the future? Ms. Liu Weihai, Director of Electric Vehicle Parts and Special Cables for Greater China at DeKai Quality Certification (Shanghai) Co., Ltd., stated that the original wire and cable standard required the color of the vehicle charging cable to be orange, but there was no clear requirement for the color of the charging pile cable. However, everyone habitually used the orange design. In fact, there are still black, dark blue and other charging station cables on the market, but the quantity is relatively small. In the future, when a large number of charging stations appear, it is estimated that cables of various colors may appear.
