Use the Charge–Discharge Cycling node to specify a load cycling boundary condition in time-dependent simulations, where the switch between charge and discharge depends on the resulting cell voltage (or current). The node can for instance be used for constant-current/constant-voltage (CCCV) cycling in battery simulations.

Depending on the Start Mode setting, the node will either start in Charge or Discharge mode.

Each cycle always starts with a constant Discharging current or Charging current period that ends when the corresponding Minimum voltage or Maximum voltage is reached (the voltage is defined with respect to ground). In the Lithium-Ion Battery and the Battery with Binary Electrolyte interfaces, if the Define cell state of charge (SOC) and initial charge inventory checkbox has been selected in the Cell Settings section in the physics interface top node, the Discharging current and the Charging current can be specified either explicitly or as a multiple of the C-rate current variable (xxx.I_1C_cell, where xxx is the physics interface tag) that is defined by the global SOC and Initial Charge Distribution node.

After the constant Discharging/Charging current period, you can also Include constant voltage discharging/charging periods, which will end when the specified Lower cutoff current or Upper cutoff current is reached. At the end of each cycle, you can also select Include rest period and specify the Resting time.

The node also defines a cycle counter variable (xxx.cdc1.cycle_counter, where xxx is the physics interface tag), which can be used in results processing or when defining Stop Condition in the time-dependent solver to end the simulation when a specified number of cycles has been reached.