Anatomical analysis of the causes of swelling and deformation of electric vehicle batteries

When many problematic batteries are taken to the maintenance department to remove them, they will find that the originally flat and square batteries have become pitted and uneven, severely swollen and deformed. Why is this? Here the author collects information and summarizes the main reasons for the deformation for everyone: 　　1. The charger is not qualified or not matched. Now the number of electric vehicles is constantly increasing. In some small cities, it can be said that every family A must-have transportation tool for every household. Don't be afraid when the electric car is out of power. Just borrow a charger to charge it and solve the problem in minutes. But have you considered whether this charger matches your own electric car battery? In fact, using a mismatched electric vehicle for charging is an important cause of battery swelling and deformation and one of the most common causes. It is recommended to use a rechargeable battery that matches the battery of an electric vehicle.　　2. The problem of electric vehicle batteries. 　　This kind of battery is mainly caused by uneven or insufficient acid in the battery production process, but the number of this phenomenon is very small. 3. The battery charging current is too large or the charging time is too long. Charging is an exothermic process. When the battery charging current is too large or the charging time is too long, the electrolyte temperature will rise rapidly and generate a lot of gas, which makes the battery plate The active material on the battery becomes loose and falls off, causing the battery to swell. 4. The battery plate is vulcanized. If the battery plate is not charged in time after riding, the plate will be sulfated. During the high current charging process of the battery with plate vulcanization, the cell voltage and electrolyte temperature will increase rapidly. The bubbles are generated early and violently, which can easily cause the battery to swell. 5. The viscosity of the electrolyte is too high. When the temperature is too low, the viscosity of the electrolyte is high, the speed of penetrating into the pores of the electrode plate is slow, the internal resistance increases, and the voltage drop on the internal resistance consumed during discharge will also be large, which will cause the electrolyte temperature The rapid rise produces a large amount of gas, which increases the gas pressure inside the battery. If the battery is over-discharged at this time, the temperature of the electrolyte will rise faster and more gas will be generated, which will increase the gas pressure inside the battery, which will easily cause the battery to burst. In addition, the explosive gas generated during the charging process of the battery, if it encounters an open flame, will immediately cause an explosion, causing the battery to burst. Therefore, the charging room must be well ventilated, and fireworks are strictly prohibited.　　6. u200bu200bThe electrolyte is dry. 　　 The battery will lose water after long-term use, and the electrolyte will dry up. At this time, overcharging will cause the battery to bulge.　　 In short, when you use electric vehicles, you must use them correctly to avoid unnecessary dangers. When choosing batteries, try to choose high-quality, well-known, and after-sales batteries. Previous: Get! Electric vehicle battery maintenance skills