Does discharge rate affect lithium-ion battery cell characteristics?

An experimental analysis to study lithium-ion battery cell characteristics at different discharge rates is presented. Based on constant current discharge experiments and hybrid pulse power characteristics experiments, discharge rate effects on cell thermal characteristic, capacity characteristic and electrical characteristic are analyzed.

What is a constant current discharge of a lithium ion battery?

Constant current discharge is the discharge of the same discharge current, but the battery voltage continues to drop, so the power continues to drop. Figure 5 is the voltage and current curve of the constant current discharge of lithium-ion batteries.

What happens if a battery is discharged constant power?

Keep the discharge power unchanged, because the voltage of the battery continues to drop during the discharge process, so the current in the constant power discharge continues to rise. Due to the constant power discharge, the time coordinate axis is easily converted into the energy (the product of power and time) coordinate axis.

What is lithium-ion battery discharge test mode?

The lithium-ion battery discharge test mode mainly includes constant current discharge, constant resistance discharge, constant power discharge, etc.

How does discharge current affect battery capacity?

An increase in the discharge current of the battery may decrease the effective capacity due to a decline of the reactivity of the battery’s active materials. Mathematically, this is expressed as: where P is the Peukert constant, i is current and K is a constant.

What is discharged capacity of a lithium battery?

The discharged capacity, D is the total charge drawn from the battery at the time instant in which it is considered. This correlation is shown in Figure 1 b, Figure 2 b and Figure 3 b where data is presented for lithium batteries from various manufacturers.