Firstly, the production and manufacturing process is not qualified. If the electric vehicle market is mixed, many companies are prone to bulging due to the limited manufacturing level of lithium-ion customized batteries, uneven electrode coating, and no air gap left for the batteries.

　　Lithium ion customization

　　2. The customized lithium-ion battery pack is overcharged. On the one hand, overcharging of the battery can easily cause ignition, and on the other hand, it can also cause battery bulging. Battery overcharging can cause a large amount of heat in the battery, leading to electrolyte decomposition and gasification, causing the battery to bulge.

　　3. The charging current is too high. Currently, many car owners privately modify batteries and electric vehicles. In addition, some car owners purchase cheap and mismatched chargers in order to obtain a lower price. Different sizes of batteries have specified voltage and current. If the charging current is too high, it can lead to rapid precipitation on the electrode plate, which in turn leads to insufficient chemical reactions, high temperatures, and untimely exhaust, resulting in the phenomenon of battery bulging.

　　4. The pressure of the safety valve is too high, and industry insiders are aware that electric vehicle batteries are equipped with a safety valve to ensure safety. When the pressure inside the electric vehicle battery rises, the safety valve will automatically open to release pressure, ensuring the balance of internal and external air pressure in the battery. If the safety valve cannot be opened normally when the pressure inside the lithium-ion battery pack rises, over time, due to the high pressure inside the battery and the imbalance of internal and external air pressure, there will be a phenomenon of bulging.

　　5. Mixing chargers, some car owners have more than one electric car at home and often mix them when charging the electric car. For example, using a 60 volt charger to charge a 48 volt battery, or charging a low to high volt battery for a long time can cause the battery to bulge.

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