How to detect the quality of lithium-ion batteries in electric vehicles

1. The most accurate way to test the battery capacity of an electric car with a multimeter is to test the battery capacity with a discharge meter for full charge, Cu003dWu003dIUt, that is, the capacity is equal to the discharge current ampere (A) X voltage volt (V) X time seconds Or hours (S or H), generally discharge with a rated capacity of 0.5 to 2 times current, such as a 12AH battery fully charged and discharged for two hours at the rated voltage and current as the eligibility standard. The current is inversely proportional to the discharge time and the discharge capacity. The discharge current The larger the rate is, the discharge time is more than one hour, and the discharge capacity is about 8AH. On the contrary, when the discharge rate is 0.5, the discharge time can be more than 15AH in two hours. 2. Professional testing methods for lithium-ion battery packs for electric vehicles 1. After the battery is fully charged, connect the battery, ammeter, and resistance wire. 2. The internal circuit of the battery is open. Some electric vehicle lithium-ion battery packs are internally disconnected, which means that the battery has voltage and no current, and the vehicle has electricity and the motor does not rotate. If the vehicle is normal after a new set of batteries is replaced, it is a battery problem. 3. The green light of the charger does not change, and the green light of the charger does not change when charging. The green light of the charger is on when the charger is unloaded. Generally, it is caused by the lack of water or scarce sulfuric acid inside the battery. After opening the battery cover, unscrew the one-way Valve or safety valve, inject an appropriate amount of special replenisher into the battery, and charge for 6-10 hours to switch. 4. The electric vehicle has a short continuous mileage. Check whether the no-load current and running current of the vehicle are too large. The no-load current should not exceed 1.2 amperes. The running current should be at a load of 75kg and a speed of 20km/h. It should be greater than 7.5 amperes. If the above situation occurs, replace the controller or motor and perform the test again. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Detailed explanation of the inconsistency mechanism of lithium-ion batteries