Optimal selection range of FCV power battery capacity considering the synergistic decay of dual power source lifespan

To explore a new method for the selection of power battery capacity range considering the synergistic decay of dual power source lifespan under the operating lifespan cycle of fuel cell vehicle (FCV). Based on the dual power source decay model and the proposed power-following energy management strategy (EMS) based on low-pass filtering, this paper analyses the influence of control parameters (proton exchange membrane fuel cell (PEMFC) response speed, filter order) and design parameters (fuel cell rated power, power battery capacity) on the dual power source. The governing law is the power source decay rate, and based on this law, the synergy point of dual power source decay under variable control parameters and different power battery capacities is fitted, and the power battery capacity allowing dual power sources to synergistically decay under variable control parameters is summarized. The results show that under this strategy, when the capacity range of the power battery is 20–143 Ah, changing the control parameters in real time can make the dual power sources synergistically attenuate. Based on this capacity range, the PEMFC response speed and filter order corresponding to the dual power source decay synergy point obtained under the power battery capacity matching selection method can enable the dual power source synergistic decay to be verified by hardware-in-the-loop (HIL) simulation. The results show that at the end of the simulation, the dual power source decay rates can be synergistic.