Introduction to the detection and repair methods of lithium-ion battery packs for electric vehicles

Electric vehicle lithium-ion battery pack detection method 1. Multimeter to detect the quality of electric vehicle batteries. The most accurate way to professionally test the battery capacity is to test the battery capacity with a fully charged discharge meter, Cu003dWu003dIUt, that is, the capacity is equal to the discharge current ampere (A)X Voltage volts (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 is the eligibility standard, the current size and the discharge time It is inversely proportional to the discharge capacity. The larger the discharge current is, for example, the discharge time is more than one hour at a rate of 2 and the discharge capacity is about 8 AH. On the contrary, when the discharge current is used at a rate of 0.5, the discharge time can be more than 15 AH in two hours. Second, the professional detection method of lithium-ion battery pack 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 have internal open circuit, which is manifested as the battery has voltage and no current, the whole vehicle has electricity, and the motor does not rotate. If the whole 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, the green light of the charger does not change when charging, and 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 driving range. Check whether the no-load current and running current of the vehicle are too large. The no-load current should not exceed 1.2A. The running current should not exceed the load of 75kg and the speed of 20km/h. Should be greater than 7.5A, if the above situation occurs, replace the controller or motor and test again. Repair method of electric vehicle lithium-ion battery pack 1. Regrouping: After the entire battery pack is damaged, we often perform charge and discharge inspections on the electric vehicle lithium-ion battery pack. In the inspection, it is often found that 50% of a set of batteries The battery is not damaged. The reason is that in the series-connected battery pack, individual batteries lag behind, resulting in a decline in the function of the entire battery pack, so that the function of the entire battery pack is reduced. 2. Water replenishment: Replenishing water for the lithium-ion battery of an electric vehicle after about 4 months can extend the service life of the battery, and the extension time can reach more than 3 months on average. It should be noted that after each replenishment of water, the battery is in an overcharged state to turn the battery from a quasi-lean liquid to a lean-liquid state, and this overcharge is beneficial to increase the battery capacity. 3. Elimination of sulfide: battery repair equipment is used to eliminate sulfide of the battery. 4. Particle generator: The particle generator is connected in parallel to the battery to repair the battery. This method is better for repairing the lithium-ion battery pack of electric vehicles, but because the repair is relatively thorough, if there is no over-discharge, for the lithium-ion batteries of electric vehicles that are used continuously, the possibility of battery vulcanization is often completely eliminated. . 5. Comprehensive repair method: regular inspection of lithium-ion batteries for electric vehicles, timely desulfurization and water replenishment, single battery charging and reconfiguration. The battery description, if it is maintenance-free, generally do not add water. If you want to add water, first check the electrolyte density of the electric vehicle battery itself, and select the corresponding concentration or non-concentration water to supplement according to different situations, so that the battery capacity can be increased or the service life can be extended. 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: Lithium-ion battery manufacturers' requirements for cathode materials