Energy storage load curve discharge curve

How does discharge affect the shape of a V – C / T curve?

By reviewing the literature, it can be found that the shape of the beginning arch of the V – C / T curves under (dis)charge seems to remain almost unchanged upon changing some conditions such as charging or discharging, additives, morphologies, heat treatments, number of cycles, operation temperature, and even current rate.

Why do we measure charge and discharge performance under constant full load?

Since the battery units had different SOCs in the measurement and only correspond to the SOC shown in the totality, the already discussed distinctive points and areas result in the measurement curves. The measurements thus show charge and discharge performance under constant full load.

What are the underlying mechanisms of charge–discharge behaviour of batteries?

Understanding the underlying mechanisms of the charge–discharge behaviour of batteries, especially Li-ion and Na-ion intercalation ones, is obligatory to develop and design energy storage devices. The behaviour of the voltage–capacity/time (V – C / T) diagram is one of the most critical issues which should be understood.

What is a SoC curve for a Li-ion battery?

The SOC curve is only presented for the LFP and LTO battery unit and helps to find the constant power and constant voltage phases and makes the unusable part of the capacity clearer. Next to the figures, the mean and maximum cell voltage differences for all li-ion battery units is listed in Table 4. Fig. 12.

Can a battery discharge time be a function of rate?

Moreover, it is established that the relationship can predict (dis)charge time as a function of rate for both intercalation and conversion rechargeable batteries, including Li-ion, Na-ion, Li–S, Na–S, NiMH, and lead–acid batteries. It seems to be a key parameter to link various kinds of battery.

Why do the V – C / T curves' end arch change with the conditions?

In contrast, the curves' end arch changes with the conditions. The phenomenon is explained based on the bipolarization of the cathode particles' mechanism. Influences of the current rate and particle size on the V – C / T curves are investigated. Accordingly, a general mathematical relationship is proposed here for the V – T curves' boundaries.