In this paper, the battery energy storage technology is applied to the traditional EV (electric vehicle) charging piles to build a new EV charging pile with integrated charging, discharging, and storage; Multisim software is used to build an EV charging model in order to simulate the charge control guidance module.
The simulation results of this paper show that: (1) Enough output power can be provided to meet the design and use requirements of the energy-storage charging pile; (2) the control guidance circuit can meet the requirements of the charging pile; (3) during the switching process of charging pile connection state, the voltage state changes smoothly.
Moreover, An et al. conducted experimental studies on different liquids for cold storage in LAES. Their findings indicated the use of R123 and propane as two-stage cold storage materials, resulting in a high cold storage efficiency of 91.35 %.
Liquids for the cold/heat storage of LAES usually result in a high round-trip efficiency of 50–60 %, however, these liquids are flammable and hence unsuitable for large-scale applications. The traditional standalone LAES configuration is reported to have a long payback period of ∼20 years with low economic benefits.
The traditional charging pile management system usually only focuses on the basic charging function, which has problems such as single system function, poor user experience, and inconvenient management.
Liquids for the cold/heat storage of LAES are very popular these years, as the designed temperature or transferred energy can be easily achieved by adjusting the flow rate of liquids, and liquids for energy storage can avoid the exergy destruction inside the rocks.
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