What are the safety issues facing high-capacity lithium batteries?

1. The greater the energy in a system, the more dangerous it is. Lithium-ion batteries are a typical example. Under the same material and manufacturing process, it is unrealistic to increase the battery energy while reducing the risk at the same time. 2. Due to the principle of current superposition, the vicinity of the battery tabs is the convergence point of current superposition, which will make the current density of the large cell battery grade board uneven, and then the local temperature will be too high. 3. When the battery is working, the temperature at the center position is very high. The larger the battery, the greater the temperature gradient from inside to outside, and the greater the temperature difference between inside and outside. Therefore, according to the second law of thermodynamics, the external battery temperature is the same. Under the circumstances, the internal core temperature of the large-capacity battery will be very high. 4. The change of the chemical substance reaction in the battery will cause the volume change. The larger the battery volume, the more severe the deformation of the electrode plate will cause the uneven change of the current. The working principle of the battery is like this, which causes us to pay more attention to the safety of power lithium batteries. Unfortunately, the existing safety testing methods cannot effectively test the safety of lithium-ion power lithium batteries in the actual application process. 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 article: What is the current status of high-energy batteries?