What are the important testing methods for lithium-ion battery electric vehicles?

First of all, you can check for abnormalities such as swelling, leakage, burnout, etc. through the appearance. When the battery obstruction cannot be determined by intuitive methods, an open circuit voltage test and a computer-based lithium-ion battery pack capacity test are required. Batteries that need to be on the computer, open circuit voltage test and battery capacity test on the computer are divided into abnormal voltage batteries, over-discharge batteries, abnormal discharge time batteries, and rechargeable batteries with fever. 1. Multimeter testing the pros and cons of electric vehicle batteries. The most accurate way to test the battery capacity of electric vehicles is to test with a discharge meter, Cu003dWu003dIUt, that is, the capacity is the discharge current ampere (A) X voltage volt (V) X Time seconds or hours (S or H). Generally, the rated capacity is 0.5 to 2 times to discharge the electricity. For example, the 12AH battery is fully charged and discharged for two hours at the rated voltage and current. The current size is inversely proportional to the discharge time and the discharge capacity. , The larger the discharge current, such as 2 times the discharge time is more than one hour, and the discharge capacity is about 8AH. On the contrary, when the discharge current is 0.5 times, the discharge time can be more than 15AH in two hours. Second, the professional electric vehicle lithium-ion battery pack detection essentials 1. After the battery is fully charged, connect the battery, ammeter, and resistance wire. 2. The internal circuit of the battery is open. The internal open circuit of the lithium-ion battery pack of some electric vehicles 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 changed, 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 empty. The general environment is caused by the lack of water or scarce sulfuric acid inside the battery. After opening the battery cover, unscrew the one-way The valve or the safety valve, inject an appropriate amount of special supplementary fluid into the battery, and it can be converted after 6-10 hours of charging. 4. The electric vehicle has a short continuous running mileage. Check whether the no-load current and running current of the vehicle are too large. The no-load current should not be higher than 1.2 amperes. The running current should be at a load of 75kg, a speed of 20km/h, and when driving on a flat cement or asphalt road. It should not be greater than 7.5 amps. If the above-mentioned environment is present, change the controller or the motor and conduct the test again. 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 post: What are the basics for the correct charging of lithium-ion battery electric vehicles?