Balance Battery Cells with Switched Capacitor Method
This example shows how to balance a battery with two cells connected in series by using the switched-capacitor (SC) strategy for active cell balancing. For shuttling the energy between the battery cells, this method uses capacitors as external energy storage elements. To balance N cells, the SC method requires N-1 capacitors and 2*N bidirectional switches. The control strategy has two states only and can work in charging and discharging modes. The initial state of charge (SOC) is 0.7 for one cell and 0.75 for the other. To generate more detailed battery packs, use the objects and functions in the Battery Pack Model Builder.
Model Overview
Simulation Results
This plot shows the cell SOC values.
Results from Real-Time Simulation
This example has been tested on these platforms:
Speedgoat™ Performance real-time target machine with an Intel® 3.5 GHz i7 multi-core CPU and 4 GB RAM.
dSPACE® SCALEXIO LabBox with Intel® Core XEON E3-1275v3 at 3.5GHz and 4 GB RAM.
You can run this model in real time with a step size of 20 microseconds by using the Simscape local solver. For small sample rates, a task overrun might occur during the initial task execution due to a cold cache. To avoid this overrun, if the selected platform supports these options, relax the start-up behavior by specifying a limited number of task overruns or increasing the sample time of periodic tasks during the start-up phase of the real-time application.
