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Attention should also be paid to short circuits within the battery

The expert told reporters that currently, the majority of fire incidents caused by battery packs are related to the battery itself, but there are also a few issues related to the non-standard battery market. He said that the concentration of power lithium-ion batteries in China is relatively high, and the top ten companies have a market share of over 80%. These companies have strong technical strength and attach great importance to battery production quality. However, there are over a hundred battery production companies in China that seek their own survival in different sub sectors. Some of the products of second-rate battery companies will still enter the market, and their products may have problems with the battery cells themselves. For example, if the content of impurities in the battery cell is too high, without external factors, there may be a short circuit in the battery, which will lead to Thermal runaway of the battery and fire.

The internal short circuit of batteries cannot be ignored, "said Mao Huanyu, Chairman of Suzhou Yuliang Battery Co., Ltd." There are many opportunities in the design and manufacturing process of batteries to leave safety hazards of internal short circuits. Current technology cannot completely eliminate and prevent the occurrence of internal short circuits, and it cannot be detected before the accident occurs. Although the internal short circuit of batteries is a small probability event, it cannot be ignored. Once an internal short circuit occurs, it will be catastrophic

Mao Huanyu said: "Internal short circuit cannot be overcome, but two measures can be taken to ensure the safety of the battery. One is to reduce the intensity of Thermal runaway; the other is to set up thermal expansion barriers." In order to achieve this goal, Suzhou Yuliang Battery Co., Ltd. has explored its own set of preventive measures: reduce the reaction energy of the thermal runaway battery through chemical control, set up heat transfer barriers, etc.

At present, battery safety is increasingly attracting industry attention, and many domestic institutions and companies are also committed to researching the safety of battery systems. Gao Youyin, Secretary of the Party Committee of China's Datong Strategic Research Center and Director of the Ytterbium Chromium Chemical Physics Research Institute, once presented their research results on the safety of electric bus battery systems to a reporter from China Automotive News. He said that this system is a fire fighting subsystem added to the battery pack, which has a fire extinguishing control device. Once the battery pack has Thermal runaway, the fire extinguishing system will start quickly, so as to prevent further damage and ensure the safety of the battery system.

In addition, the recent electric vehicle fire accident has attracted high attention from the Ministry of Industry and Information Technology, and it is explicitly required that new energy bus production companies immediately carry out special safety hazard investigation work. Experts point out that with the common attention of all sectors, new energy vehicles will become increasingly safe.

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