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Writer Ro Keunhyung
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Subject The cause of the Kona EV fire was narrowed down to LG Ensol's Chinese-made battery cells

The cause of frequent fires in Hyundai Motors' Kona Electric Vehicles (EV) has been narrowed down to defective battery cells of LG Energy Solutions. Hyundai Motor Company will voluntarily take corrective action (recall) for three electric vehicles that use the same battery cell. The recall cost of KRW 1 trillion is shared by LG Energy Solutions.
On the 24th, the Ministry of Land, Infrastructure and Transport announced that Hyundai Motor Company and LG Energy Solutions will voluntarily recall a total of 26,699 units, including Kona EV (25,083 units) and'Ioniq EV' (1,314 units), and electric bus'Elex City' (302 units). Revealed.
The recall target is the entire high-voltage battery system (BSA) installed in three types of vehicles. From the 29th of next month, Hyundai will gradually replace all BSAs of the target models. The same measures are taken for the same car model sold not only in Korea but also in overseas markets. A total of 81,701 units were recalled at home and abroad.
The Ministry of Land, Infrastructure and Transport, based on the results of joint defect investigations between the Korea Transportation Safety Authority (KATRI) and experts, determined the cause of the Kona EV fire with a battery cell initially produced by LG Energy Solutions' Nanjing Plant in China (September 2017 to July 19) Estimated. This is because it was confirmed that some of the high-voltage batteries could cause a fire due to an internal short circuit due to poor cell manufacturing (folding of the negative electrode tab). If bad battery cells are the problem, it is explained that a fire occurred in Kona EV, which completed the battery management system (BMS) update without battery replacement in March last year.
According to the Ministry of Land, Infrastructure and Transport, the result of an interim investigation of a Kona EV vehicle that broke out in Daegu on the 23rd of last month also proves this. At that time, the fire started in the battery cell on the left side of battery pack #3, and a part of the internal positive (+) tab was destroyed in the fire.
In the disassembly investigation of the collected high-voltage battery, the possibility of a fire was found due to misalignment inside the cell (folding of the negative electrode tab). The explanation of the Ministry of Land, Infrastructure and Transport is that lithium by-products precipitate on the negative electrode due to the folding of the negative electrode tab, and this diffuses to the positive electrode, resulting in a possibility of a short circuit when contacting the positive electrode tab.
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