Discharge power after industrial and commercial energy storage cabinets are connected in parallel

How does cell capacity affect discharge current discrepancy?

Distribution of cell capacity, initial SOC and model parameters for the N samples in the simulation. As shown in Fig. 12, the maximum discharge current discrepancy between cells increases monotonically with the number of cells in parallel.

What is a voltage vs discharge C-rate curve?

On each cell’s voltage vs. discharge C-rate curve, data points can be found where they have the same voltage and the sum of their current values equals the total current of the parallel connection.

What is the maximum discharge current discrepancy between cells?

However, although cells in each parallel connection have close health states, the ratios of the maximum discharge current discrepancy between cells to the average discharge current are 40% for LiFePO 4 connection and 27% for Li (NiCoAl)O 2 connection, respectively.

Does a parallel connection degrade at different rates?

Cells in a parallel connection may degrade at different rates due to uneven current distribution. Shi et al. tested a parallel connection with two cells cycled at 25 ℃ and 50 ℃, respectively. They found that the cell at 25 ℃ degraded faster than the cell at 50 ℃.

Do different chemistries behave differently when varying discharge C-rates and discharge time?

It is found that the different chemistries we tested (i.e., LiFePO 4 and Li (NiCoAl)O 2), do not behave differently when varying the discharge C-rates and discharge time, even they have distinct SOC-OCV characteristics.

What happens if a battery reaches a discharge cut-off voltage?

Once one individual cell in a series connection reaches the discharge cut-off voltage, the entire series connection will stop discharging. Thus, many cells are never fully charged or discharged, and the available capacity of the battery pack is subject to the minimum capacity of the individual cells.