Simple analysis of high-rate batteries

The composition of high-rate lithium battery 1. Positive electrode: Lithium phosphate LiCo0:)\Lithium iron phosphate (LiFePO4)\Lithium nickel manganate Li(NiCoMn)O2), adhesive (PVDF), conductive agent (SP), solvent (NMP), current collector-substrate (aluminum box-AI). 2. Negative electrode: graphite (C), binder (SBR), thickener (CMC), conductive agent (SP), solvent (water), current collector-substrate (copper box-Cu). 3. Electrolyte 4. Isolation film 5. Tabs 6. Aluminum-plastic film (outer packaging) Lithium battery discharge rate C-Rate can release energy under different currents. Generally speaking, the batteries must be detected at different constant currents. Discharge performance in case. How to evaluate the battery rate (how much is the rate of C)? When discharging with a current N times the capacity of the battery 1C, and its discharge capacity is more than 85% of the capacity of the battery 1C, we think that the discharge rate of the battery is N times. For example: a 2000mAh battery, when discharged with a 2000mA battery, the discharge time is 60min, if it is discharged with 60000mA, the discharge time is 1.7min, we think the battery discharge rate is 30 times (30C). Uniform voltage (V) u003d discharge power (Wh) u0026 pide; discharge current (A) median voltage (V): it can be understood as the voltage value corresponding to 1/2 of the total discharge time. The median voltage can generally be called the discharge platform. The discharge platform is related to the discharge rate (current) of the battery. The higher the discharge rate, the lower the discharge platform voltage. It may be determined by calculating the battery discharge energy (Wh)/discharge capacity (Ah) Its discharge platform. A parameter for the service life of a high-rate battery. Basically, the cell is charged and discharged multiple times and the cell capacity is reduced to 80% as the detection point. The battery will have energy loss (impedance, heat) 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. 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 distinguish between positive and negative materials for lithium batteries?