Abstract
Environmentally friendly and pollution-free fuel cell/lithium battery hybrid vehicles have received the attention of the community in recent years. It is imperative for fuel cell/lithium battery hybrid vehicles to use the energy management strategy (EMS) to distribute the output power of each power source to improve fuel economy and system life. In practical application, inconsistency of battery pack will lead to security hazard and capacity degradation. However, few EMS take the inconsistency of battery pack into account. Also, the current battery equalization strategy rarely discusses how to perform the equilibrium process while meeting the power demand of vehicle. To solve these issues, a novel equalization energy management strategy (EEMS) based on the switch network is proposed at first. Then, a switched energy management strategy (SEMS) that switches between the EEMS and the equivalent consumption minimization strategy (ECMS) is proposed and implemented in the fuel cell/lithium battery hybrid system to validate its effectiveness. The results show that the proposed SEMS can ameliorate the inconsistency of series lithium battery pack while meeting the power demand of vehicle’s normal operation. It can improve the safety and durability of the system and reduce the equalization time. Besides, it has good expansibility and no energy waste.
Highlights
In recent years, the world’s environmental pollution and energy shortages have become increasingly serious
When σSOC is higher than the threshold, which denotes that the inconsistency of the battery pack is higher than its limit value, the switched energy management strategy (SEMS) turns into the energy management strategy (EEMS) mode
The key issue of energy management strategy (EMS) is to the energy distribution in hybrid systems
Summary
The world’s environmental pollution and energy shortages have become increasingly serious. Jin [23] proposed a fuzzy logic EMS distributes power based on the operation mode of the vehicle and the real-time voltage of the super capacitor. The EMS based on fuzzy logic rules proposed by Hemi [24] reduces the hydrogen consumption of hybrid system and prolongs the battery life. The current battery equalization strategies rarely discuss how to perform the equilibrium process while meeting the power demand of vehicle To solve these issues, this paper takes into account the inconsistency of series lithium battery pack and the energy distribution of hybrid power systems. Part 2.2 describes the methods and results of of the battery test, and modeling serieslithium lithiumbattery batterypack packisisdescribed
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