Electric vehicle lithium battery pack repair technology and repair methods. As the performance, energy conservation and environmental protection requirements of electric vehicles continue to increase, lithium batteries have gradually replaced lead-acid batteries. However, batteries cannot always be used, even high-performance lithium batteries. After a certain period of use, Neither the power performance nor the battery life can meet the demand, so the only option is to replace it and scrap it.

　　But many people will think, can't this kind of lithium battery pack be repaired technically? The editor can definitely tell you that the repair of lithium battery pack is completely possible. Here is an introduction to the lithium battery pack for electric vehicles. Restoration techniques and restoration methods.

　　Testing methods for electric vehicle lithium battery packs

　　First, you can check whether there are any abnormalities such as bulging, leakage, burning, etc. through the appearance. When the battery failure cannot be judged intuitively, you need to conduct an open circuit voltage test and put the lithium battery pack capacity on the machine to detect. Batteries that need to be put on the machine and need to be tested for open circuit voltage and battery capacity are divided into batteries with abnormal voltage, over-discharge batteries, batteries with abnormal discharge time, rechargeable heating batteries, etc.

　　1. Use a multimeter to detect the quality of electric vehicle batteries

　　The most accurate way to professionally test battery capacity is to test it with a discharge meter when it is fully charged, C=W=IUt, that is, the capacity is equal to the discharge current in amperes (A) Discharge with a current of 0.5 to 2 times the rated capacity. For example, if a 12AH battery is fully charged and discharges for two hours at the rated voltage and current, it is qualified. The current size is inversely proportional to the discharge time and discharge capacity. The larger the discharge current is, such as 2 times, the discharge time is The discharge capacity is about 8AH in more than one hour. On the contrary, it can discharge 15AH in more than two hours with 0.5 rate discharge.

　　2. Professional testing methods for electric vehicle lithium battery packs

　　1. After the battery is fully charged, connect the battery, ammeter and resistance wire.

　　2. The battery has an internal circuit break. Some electric vehicle lithium battery packs have an internal circuit break, which shows that the battery has voltage but no current, and the vehicle has power but the motor does not rotate. If the vehicle is normal after replacing a new set of batteries, it is a battery problem.

　　3. The green light of the charger does not change. When charging, the green light of the charger does not change. When the charger has no load, the green light turns on. Generally, it is caused by the lack of water or dilute sulfuric acid inside the battery. After opening the battery cover, unscrew the one-way valve or safety valve, inject an appropriate amount of special replenishing fluid into the battery, and charge for 6-10 hours to convert.

　　4. The driving range of electric vehicles is short. Check whether the no-load current and operating current of the vehicle are too large. The no-load current should not exceed 1.2A. The operating current should not exceed 1.2A when the load is 75kg, the speed is 20km/h, and it is not necessary when driving on flat cement or asphalt roads. It should be greater than 7.5A. If the above situation occurs, replace the controller or motor and test again.

　　Methods for repairing electric vehicle lithium battery packs

　　1. Re-package: After the entire set of batteries is damaged, we often conduct charge and discharge tests on the lithium battery packs for electric vehicles. During the inspection, we often find that 50% of the batteries in a set of batteries are not damaged. The reason is that in a series-connected battery pack, individual batteries lag behind, resulting in a decline in the performance of the entire battery pack, resulting in a decline in the performance of the entire battery pack.

　　2. Replenish water: Replenishing water for an electric vehicle lithium battery that has been used for about 4 months can extend the service life of the battery to an average of more than 3 months. It should be noted that after each replenishment of water, the battery is in an overcharged state to change the battery from a "quasi-liquid-poor" state to a "liquid-poor" state, and this overcharging is beneficial to increasing battery capacity.

　　3. Eliminate sulfide: Use battery repair equipment to eliminate sulfide on the battery.

　　4. Particle generator: A particle generator is connected in parallel to the battery to repair the battery. This method is better for repairing electric vehicle lithium battery packs, but because the repair is relatively thorough, if there is no over-discharge, for continuously used electric vehicle lithium batteries, the possibility of battery vulcanization is often completely eliminated.

　　5. Comprehensive repair method: Regular inspection of lithium batteries for electric vehicles, timely removal of sulfur and replenishing water, charging and reconfiguration of individual batteries. Battery instructions: If it is maintenance-free, there is generally no need to add water. If you need to add water, first check the electrolyte density of the electric vehicle battery itself, and choose water with corresponding concentration or no concentration according to different situations to replenish it, so that the battery capacity can be increased or the service life can be extended.

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