What are the safety issues of power lithium-ion batteries?

At present, the theoretical energy density limit of ternary lithium batteries is around 350Wh/kg-400Wh/kg, and there are still many engineering problems to be solved here. Therefore, if there is no breakthrough in new materials, the specific energy of the battery may hover between 300Wh/kg-400Wh/kg. Only on the premise of achieving engineering technological breakthroughs, can it be possible to increase the energy density of single cells to 500Wh/kg, and it is possible to increase the energy density of battery packs to more than 260Wh/kg. However, the development and application of various materials will take 1-2 years or even longer. The current national practice of adjusting the specific energy density of the system once a year is inconsistent with the development cycle of the power lithium-ion battery system. The result is that it cannot be fully verified, leading to frequent fire accidents. EV Century also interviewed Mr. Wang Zidong's views on the current adoption of NCM811 batteries by many car companies. Mr. Wang Zidong said: In the case of insufficient battery system verification and inadequate thermal management system technology, these models are the time bombs he mentioned before in walking. I hope that car companies can pay attention to it. Safety issues of power lithium-ion batteries 1. During the manufacturing process of batteries. The safety requirements in the manufacturing process are very high. There has been no accident in the lithium battery factory, including LG and Samsung. 2. In the process of battery pack integration. The battery cells are exposed to the outside, which is a problem when assembled into a battery pack. 3. Storage process. Why should the processed battery be stored instead of being directly used by the user? Because the manufacturing process of lithium batteries is too demanding, the current domestic level, including the international level, it is difficult for these big-name companies to control it without fail. Only in the process of shelving will bad things be revealed. A good company is 10-15 days. During this period, the small defect is that the voltage of the battery decays faster, and the big one is on fire. 4. During transportation. In one accident, the battery-carrying vehicle went down a long slope, 10-20 kilometers, and the brake system temperature was too high and the battery ignited. 5. Use process. This is directly related to charging. All the chargers on the market have all wrong principles. This principle is a bit like when I took the subway this morning and pushed it forward. When it was invented in 1970, it was called a rocking chair battery, and ions moved back and forth between the positive and negative electrodes. Now there is no shaking reduction method in the charging process, and the traction charging method should be used instead of the push method. Lithium is very active in the periodic table, just like crowding a subway. Everyone is stuck at the door. The more crowded it is, the more it gets stuck at the door, and it becomes a problem. Everyone sees many photos on the Internet, but they caught fire while charging. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to check the quality of lead-acid batteries?