Why does the lithium battery of electric vehicles appear bulging?

The reason for the swelling of lithium-ion batteries in electric vehicles Batteries are the core components of electric vehicles. I believe that the word swelling of lithium-ion batteries is familiar to all car friends. In recent years, the phenomenon of battery bulging is not uncommon, which makes many consumers very distressed. Because once individual battery bulges appear in a group of batteries, the entire group of batteries must be replaced. 1. The safety valve pressure is too high. In order to ensure safety, the lithium-ion battery of electric vehicles will have a safety valve. When the pressure in the electric vehicle battery rises, the safety valve will automatically open and release the pressure, so as to ensure the normal battery. use. When the pressure in the battery rises, but the safety valve cannot be opened, the lithium-ion battery will bulge. 2. The charging current is too large. Normally, the lithium-ion batteries for electric vehicles produced by regular manufacturers have a certain charging current value, and because of various reasons, the voltage and charging current are too high, which can easily lead to electrodes. The precipitation on the plate is too fast, which in turn leads to insufficient chemical reaction. At the same time, if the temperature in the battery rises quickly, but the inflation is not timely, bulging will naturally occur. 3. Series overcharging. Some lithium-ion batteries in electric vehicles are used in series, which can have more capacitance. When the series-connected batteries are overcharged, it will also cause poor gas recombination in the battery, resulting in lithium-ion battery bulging. Case. 4. The battery is unqualified. If the lithium-ion battery is not designed to avoid avoidance, there will be excessive pressure in the body and the lithium-ion battery will be swollen. 5. Inferior charger The charger does not turn the light after fully charging the lithium-ion battery of the electric vehicle, and will not adjust the charging current according to the current of the battery, causing a large number of batteries to be overcharged. If you mix different types of chargers, it will also cause the battery to charge up. Different types of batteries have different chargers and cannot be used universally. However, some electric vehicle users often mix and use them during use. Use a 60V charger to charge a 48V battery, and a 20AH charger to charge a 12AH battery. , The charging voltage and current do not match, which will cause the battery to charge up. 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: What are the salient features of lithium polymer batteries?