Analysis of parameters and characteristics of high-rate battery service life

Basically, the cell is charged and discharged multiple times and the cell capacity is reduced to 80% as the detection point. The battery cell will have energy loss (impedance, thermal energy) after each charge and discharge, so it will cause a loss of capacity, and the standard of CycleLife is to charge and discharge with 1C constant current. When the capacity of the battery cell drops to 80% of its original capacity after many times of charging and discharging, we use this point as a checkpoint to check the number of cycles of the battery cell in this state. A good battery cell can generally be charged and discharged at a constant current of 1C for many times, and it has a capacity of about 80% when it reaches 300 cycles. The cycle life of a high-rate battery usually refers to charging at 1C and then discharging at the battery rate. When the battery cell has been charged and discharged for many times and the capacity drops to 80% of its original capacity, we consider the life to end. Small high-rate batteries (under 1000mAh) have a cycle life of up to 300 times; large-capacity high-rate batteries (1000mAh~5000mAh) have a cycle life of 100-200 times; higher capacity batteries have a cycle life of about 100 times. The internal structure of the high-rate battery 1. The structure of the wound high-rate battery: Generally, a positive electrode sheet, a negative electrode sheet and a separator are used in the winding method (depending on the battery capacity, it can be 1 core or 2~3 coils) It is a combination of cores in parallel. Features: battery discharge rate is not high (5~20C), battery capacity is small (under 2000mAh), battery internal resistance is large. 2. Stacked high-rate battery structure: the battery uses a multilayer positive electrode , Negative electrode and diaphragm are alternately overlapped. Features: High battery discharge rate (20~60C), large battery capacity (2000mAh~20000mAh), low battery internal resistance. Disclaimer: Some pictures and content of articles published on this site are from the Internet , If there is any infringement, please contact to delete the previous article: Why use aluminum foil for the positive electrode of the lithium battery and copper foil for the negative electrode?