From the beginning of the discharge process, the battery voltage decreases along with the increase of depth of discharge. The voltage eventually drops to the cutoff voltage and the capacity at this time is the discharge capacity corresponding to the current discharge rate.
As a key factor, the discharge rate has great impacts on both the performance and degradation trend of batteries [1, 4, 5]. However, to our knowledge, the effects of discharge rate on battery capability degradation, especially its quantitative analysis is still an open and challenging problem.
Battery degradation refers to the gradual decline in the ability of a battery to store and deliver energy. This inevitable process can result in reduced energy capacity, range, power, and overall efficiency of your device or vehicle. The battery pack in an all-electric vehicle is designed to last the lifetime of the vehicle.
Capacity diversity due to discharge rates and its retention upon cycling The discharge curves (measurement of battery terminal voltage v.s. capacity) at four discharge rates in a four cycles loop are shown in Fig. 2 (a). From the beginning of the discharge process, the battery voltage decreases along with the increase of depth of discharge.
The degradation of lithium-ion battery can be mainly seen in the anode and the cathode. In the anode, the formation of a solid electrolyte interphase (SEI) increases the impendence which degrades the battery capacity.
The accessible capacity of the batteries whose PC close to 1 is less dependent on the discharge rate and have good efficiency performance at high discharge rate. However, batteries always suffer degradation problems with capacity fading and internal resistance increase [1, 21].
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