Why are lithium-ion batteries small?

First of all, it is very dangerous for lithium-ion batteries that can only have an excessive amount of energy in an accident, causing thermal runaway, and a sharp reaction inside the battery. In a short time, too much energy is nowhere to be released, which is very dangerous. Especially when the development of safety technology and management and control capabilities is not sufficient, the capacity of each battery should be restrained. Secondly, once an accident occurs, the energy wrapped in the lithium-ion battery shell will be inaccessible and powerless by firefighters and extinguishing agents. They can only isolate the scene in the event of an accident and allow the accident battery to react by itself until the energy burns out. Of course, for safety reasons, current lithium-ion batteries have been designed with multiple safety measures. Take cylindrical batteries as an example. The safety valve, when the internal reaction of the battery exceeds the normal range, the temperature rises, and with the generation of side reaction gas, the pressure reaches the design value, the safety valve automatically opens to release the pressure. The moment the safety valve opens, the battery fails completely. Thermistor, and some batteries are equipped with thermistor. Once overcurrent occurs, after the resistance reaches a certain temperature, the resistance value increases sharply, and the current in the loop decreases, preventing the temperature from rising further. Fuse, the battery cell is equipped with a fuse with over-current fusing function, once the risk of over-current occurs, the circuit is disconnected to prevent the occurrence of vicious accidents. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Introduction to the characteristics of different robot batteries