What is the bulge of lithium batteries for electric vehicles?

1. The first is that the manufacturing process is unqualified. If the electric vehicle market is mixed, many companies have limited manufacturing levels of lithium batteries, uneven electrode coatings, and no air gaps for the batteries. Such batteries are prone to bulging. 2. The lithium battery pack is overcharged. On the one hand, battery overcharge can easily cause fire, and on the other hand, it can also cause battery swelling. Overcharge of the battery will cause the battery to generate a lot of heat, which will cause the electrolyte to vaporize and the battery will bulge. 3. The charging current is too large. At present, many car owners privately modify batteries and electric vehicles. In addition, some car owners buy cheap mismatched chargers for the sake of cheapness. Different sizes of batteries have specified voltage and current. If the charging current is too large, If the precipitation on the electrode plate is too fast, the chemical reaction is not sufficient, the temperature is too high, and the battery bulge will naturally occur if the exhaust is not timely. 4. The pressure of the safety valve is too high. People in the industry know that electric vehicle batteries are equipped with a safety valve to ensure safety. When the pressure in the electric vehicle battery rises, the safety valve will automatically open to release the pressure to ensure The air pressure inside and outside the battery is balanced. And if the safety valve cannot be opened normally when the pressure inside the lithium battery pack rises, over time, due to the high pressure inside the battery and the unbalanced internal and external air pressure, bulging will occur. 5. Mixed use of chargers. Some car owners have more than one electric car at home. When charging electric cars, they often use them together. For example, using a 60-volt charger to charge a 48-volt battery, or a low-voltage battery to charge a high-voltage battery, charging in this way for a long time will cause the battery to bulge. 6. The charging time is too long. Under normal circumstances, the battery overflowing time is 12 hours. However, some friends often leave the electric vehicle after plugging in the charger. The charging time is over for one night, even more than 24 hours. Hours. This way of charging for too long will definitely cause great damage to the battery, and the swelling of the lithium battery is definitely inevitable. 7. Using fast charging, although electric vehicles have brought us great travel convenience, there are also times when there is no electricity on the way, so sometimes only fast charging can be used. However, this method is very easy to cause swelling of the lithium battery pack. 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: What are the advantages and uses of 18650 lithium batteries?