What are the methods of repairing lithium batteries for electric vehicles

Lithium batteries for electric vehicles have become the norm. Due to the difference in performance from lead-acid batteries, little is known about how to properly use and maintain lithium batteries. After a period of driving, the mileage of lithium batteries for electric vehicles has shrunk significantly. How should we judge electric vehicles? Should the lithium battery be repaired or repurchased? What are the methods for repairing lithium batteries in electric vehicles? Next, the author will tell you slowly; the reasons for the decrease in the capacity of lithium batteries: 1. Cell aging and degradation 2. Different self-discharge rates, resulting in unbalanced battery cells in series, which eventually leads to a decrease in the capacity of lithium batteries and their durability 3. In the battery During use and charging and discharging, there will be a phenomenon of 'vulcanization' that affects the capacity of lithium batteries. The vulcanization performance of the battery is: the battery itself is low voltage, it will be full after charging, and it will disappear after discharge. The battery softening performance is: the internal liquid of the battery is turbid, black. The battery capacity is reduced, and the lead powder falls off after a long time. 4. Improper charging in summer and winter. The battery charging voltage is inversely proportional to the ambient temperature, so the temperature is high in summer, and the battery is overcharged and the battery loses water, causing the battery to swell and deform. In winter, the driving range decreases due to undercharging. Common faults and repair methods of lithium batteries for electric vehicles. 1. Battery water loss is mainly manifested by a decrease in battery capacity, which in turn leads to thermal runaway, deformation of the positive plate, and swelling of the battery shape. Repair method: pry open the cover on the electric vehicle battery; open the rubber cap to expose the vent hole; observe the electric vehicle battery through the vent hole to see if the electric vehicle battery is dry, and if so, replenish water. In addition, it is recommended to use medical disposable syringes and double-distilled water. Adding water requires careful operation, and it is not enough. 2. The battery imbalance fault is mainly manifested by the presence of one or more defective small batteries in the battery pack, and other good batteries cannot be used normally. Repair method: For battery imbalance faults, users can find out the batteries with the same capacity, voltage, self-discharge, battery internal resistance, etc. and use them together. Third, the battery sulfation failure is mainly manifested in the formation of white hard lead sulfate crystals on the plate, which is very difficult to convert into lead sulfate as an active material during charging. Repair method: use a repair instrument to repair. By measuring the battery status, positive and negative frequency conversion particle waves are continuously emitted during charging and discharging. After about 15 hours, the lead sulfate that has crystallized and hardened in the battery can be removed. However, it should be noted that this generally only applies to slight sulfation. If the sulfation is severe, new batteries need to be replaced. Fourth, the battery plate softening failure is mainly manifested as the surface of the positive plate gradually becomes soft from the solid at the beginning until it becomes a paste. At this time, due to the decrease of the surface area, the battery capacity will decrease. Repair method: After discharging the battery to 10.5V, use the bulb for deep discharge for 1 to 5 hours. Then use the activation instrument to activate the repair. In this case, there is a certain chance that it can be repaired, but if the situation is serious, it can only be replaced with a new one. 5. The battery short-circuit fault is mainly manifested as the self-discharge caused by the small lead block at the short-circuit position when it touches the positive and negative polarity, which seriously affects the service life of the battery. Repair method: remove the lead slag and lead block at the short-circuit, and restore the repair by installing new separator paper. Sixth, the battery open circuit fault is mainly manifested as a certain part of the circuit is disconnected and the resistance is too large, and the current cannot pass normally. Repair method: Use a multimeter to check the internal connections of the battery, find the disconnection, and then re-weld it. When current electric vehicle users encounter lithium battery failures, they will take them to repair shops, merchants to replace them with new lithium batteries, or some electric vehicle repairers, some forums and websites will face some electric vehicle lithium battery users asking lithium battery repair problems , It is also said that it cannot be repaired, and can only be replaced with a new one. In fact, in daily life, we must increase the maintenance of lithium batteries, so that the battery life can be extended to the greatest extent. In addition, if you encounter a lithium battery failure that cannot be solved, it is recommended to go to the repair point for repair as soon as possible to avoid causing new problems. 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: A brief analysis of various anode materials for lithium batteries