The basic concept of lithium-ion batteries for power electric vehicles

1) Electric vehicle lithium-ion battery capacity The capacity of the battery is an important performance parameter of the lithium-ion battery of the electric vehicle. It represents the amount of electricity released by the lithium-ion battery of the electric vehicle under the conditions of a certain discharge rate, temperature, and termination voltage. The capacity of lithium-ion batteries for electric vehicles is represented by C, and its units are represented by ampere-hour (Ah) and milliampere-hour (mAh). (2) Charge rate and discharge rate This concept uses the ratio of the rated capacity of the lithium-ion battery of electric vehicles to the charging time (discharge time) to express, which can compare the charging and discharging speed of lithium-ion batteries of different electric vehicles. (3) Overcharging of lithium-ion batteries for electric vehicles Overcharging of lithium-ion batteries for electric vehicles means overcharging the lithium-ion batteries of electric vehicles. Overcharging will cause certain damage to the lithium-ion batteries of electric vehicles. When the charging process is about to end, that is, when the electric vehicle lithium-ion battery is almost full, only a small current can be used to charge the electric vehicle lithium-ion battery at a low rate. Because the polarization phenomenon that only occurs when charging with a small current is lighter, less gas accumulates inside the lithium-ion battery of electric vehicles, and there is sufficient time for the lithium-ion battery of electric vehicles to dissipate heat. (4) End-of-charge voltage/end-of-discharge voltage When the lithium-ion battery of an electric storage vehicle is fully charged, it means that the active material on the lithium-ion battery plate of the electric vehicle has reached a saturated state. When the battery is charged, the voltage of the lithium-ion battery of an electric storage vehicle will no longer increase. At this time, the voltage of the lithium-ion battery of an electric storage vehicle is called the end-of-charge voltage. Similarly, the discharge termination voltage is the lowest voltage that can be reached during discharge. (5) The internal resistance of the lithium-ion battery of an electric vehicle. The resistance measured at both ends of the lithium-ion battery of an electric vehicle is called the internal resistance of the lithium-ion battery of an electric vehicle. (6) The life cycle of lithium-ion batteries for electric vehicles and the entire life cycle of aging lithium-ion batteries for electric vehicles will go through the following three stages: at the initial stage of use, the capacity will increase by 5% to 10%; the next stage , The capacity remains unchanged; in the last stage, the capacity of lithium-ion batteries for electric vehicles begins to slowly decrease. This stage of capacity reduction is the aging stage of lithium-ion batteries for electric vehicles. Generally speaking, when the capacity of the lithium-ion battery of an electric vehicle drops to 80% of the rated capacity, it is considered that the life of the lithium-ion battery of an electric vehicle is over. 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: How to use and charge lithium-ion batteries correctly?