“Electric vehicle fires may be caused by defects in battery cells or problems in the battery management system (BMS) that controls them, rather than by a 100% charge.”
There is an opinion that the cause of electric vehicle fires should be approached as a direct problem with the battery rather than the amount of charge. The basis for this is that in the case of the so-called ‘overcharging’ that some are raising, there are already double technical blocks by not only the battery manufacturer but also the finished car manufacturer.
Professor Yoon Won-seop of the Department of Energy Science at Sungkyunkwan University (Director of the Next-Generation Battery Research Institute at Sungkyunkwan Institute of Energy Science and Technology) met with domestic media on the 16th and explained this regarding the recent string of electric vehicle fires.
In particular, Professor Yoon expressed concern about the fact that the cause of electric vehicle fires is assumed to be overcharging. According to Professor Yoon, in the case of NCM (nickel, cobalt, manganese) batteries, the total capacity of the cathode is about 275 mAh per g, but the amount specified as 100% is only about 200-210 mAh. In other words, the battery life considering safety is expressed as 100%, but the actual battery capacity is larger.
He emphasized about the risk of 100% charging, “It is natural that the amount of charge and fire are related, but it is not the dominant cause.” “It is obviously dangerous to charge the entire capacity of the battery, and this is called overcharging, but overcharging is already fundamentally blocked in several ways.” He added, “Cell manufacturers have their own overcharge prevention technology, and automobile companies have software-based battery management systems (BMS).” He also said, “Fire ultimately occurs not because of the amount of charge, but when there is a defect in the cell or the BMS that can control the defect.” He added, “We also need to identify internal cell defects, as happened with the recent Mercedes-Benz electric vehicle.”
Professor Yoon said, “In the case of Hyundai Motors, it has been about three years since they properly applied more advanced technologies by utilizing the E-GMP, a platform dedicated to electric vehicles,” and “In that time, I understand there has only been one case (of a fire due to a non-collision accident), which means that they are already very well managed.”
He said that neither rapid charging nor high temperatures or humidity were decisive causes of fires. He said, “It is 10 to 100 times faster than slow charging, so the voltage increases more, which may be a bit dangerous, but the possibility of fire has already been blocked at the source,” and “Also, the battery cells are manufactured safely considering temperature and humidity.”
Professor Yoon emphasized that fundamental measures are needed. He said, “Since we are anxious right now, measures such as banning entry into underground parking lots can alleviate psychological anxiety, but when legislating or regulating this, we need to confirm the causal relationship, so it is important to take more time, gather experts, discuss and verify in-depth, and then establish measures.”Reporter Jeong Jin-su, Donga.com [email protected]
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2024-08-18 17:05:52