EPE Association: EPE 2022 - LS5c: E-Mobility: Charging Systems and Battery Issues

EPE 2022 - LS5c: E-Mobility: Charging Systems and Battery Issues
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2022 - LS5c: E-Mobility: Charging Systems and Battery Issues

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   Ferrite optimization for a three-phase wireless power transfer system for electric vehicles
By Shuang NIE [View]
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Abstract: This paper proposes a new design for placement of the ferrite in high power three-phase EV wireless power transfer systems. The paper analyzes ferrite designs with variations in orientation, size and position. The proposed design reduces ferrite usage, lowers required excitation voltage and improves DC-DC efficiency.

   Multi-port Inductive Power Transfer System Considering Charging Auxiliary Battery in EVs
By Zhuoqi ZHANG [View]
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Abstract: In electric vehicles (EVs), the main battery used for the traction system and an auxiliary battery for the low-voltage system are equipped. When inductive power transfer (IPT) is used to charge the main battery, it requires high-voltage ratings and high-cost switching devices for the onboard AC/DC converter. In addition, the onboard auxiliary battery is generally charged by an isolated DC/DC converter connected to the main battery. Due to this configuration, the high-voltage rating switching devices are needed for the isolated DC/DC converter in addition to IPT. For this, the utilization rate of the high-voltage rating switching devices for IPT is low, and that increases cost. A previous work proposed a multi-port system to integrate the transformer for the isolated DC/DC converter and the transmission coil for IPT to reduce the cost. In the previous system, though the high-voltage rating devices could be reduced, the number of the switching device was the same as in the general system. Therefore, to reduce the cost, this paper proposes a multi-port onboard converter that integrates an IPT system and an auxiliary battery charger system by using high-voltage rating switching devices for IPT. This integration reduces the number of switching devices by four compared to the general system. In this paper, the operation and characteristics of the proposed system are clarified, and its validity is verified by the experiment. Regarding the experimental result, it is confirmed the characteristics of the transmission power agreed well with the theoretical result.

   Review of Power Converter Topologies for Electrochemical Impedance Spectroscopy of Lithium-Ion Batteries
By Hamzeh BEIRANVAND [View]
[Download]

Abstract: Frequency domain impedance of Li-ion batteries contains valuable information about the state of charge (SOC) and state of health (SOH). Normally, electrochemical impedance spectroscopy (EIS) is performed during the relaxation of battery cells. However, performing EIS during the batteries operation has been achieved through switching power converters. This paper reviews the power converter topologies for both online and offline Electrochemical Impedance Spectroscopy (EIS) characterization of batteries. The information that can be extracted from EIS Nyquist plots are discussed. Comparative analysis between converter topologies is presented. Finally, challenges are identified and new converter topologies are proposed for further consideration in online/offline EIS characterization.

EPE 2022 - LS5c: E-Mobility: Charging Systems and Battery Issues
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2022 - LS5c: E-Mobility: Charging Systems and Battery Issues
	[return to parent folder]

	Ferrite optimization for a three-phase wireless power transfer system for electric vehicles By Shuang NIE	[View] [Download]
Abstract: This paper proposes a new design for placement of the ferrite in high power three-phase EV wireless power transfer systems. The paper analyzes ferrite designs with variations in orientation, size and position. The proposed design reduces ferrite usage, lowers required excitation voltage and improves DC-DC efficiency.

	Multi-port Inductive Power Transfer System Considering Charging Auxiliary Battery in EVs By Zhuoqi ZHANG	[View] [Download]
Abstract: In electric vehicles (EVs), the main battery used for the traction system and an auxiliary battery for the low-voltage system are equipped. When inductive power transfer (IPT) is used to charge the main battery, it requires high-voltage ratings and high-cost switching devices for the onboard AC/DC converter. In addition, the onboard auxiliary battery is generally charged by an isolated DC/DC converter connected to the main battery. Due to this configuration, the high-voltage rating switching devices are needed for the isolated DC/DC converter in addition to IPT. For this, the utilization rate of the high-voltage rating switching devices for IPT is low, and that increases cost. A previous work proposed a multi-port system to integrate the transformer for the isolated DC/DC converter and the transmission coil for IPT to reduce the cost. In the previous system, though the high-voltage rating devices could be reduced, the number of the switching device was the same as in the general system. Therefore, to reduce the cost, this paper proposes a multi-port onboard converter that integrates an IPT system and an auxiliary battery charger system by using high-voltage rating switching devices for IPT. This integration reduces the number of switching devices by four compared to the general system. In this paper, the operation and characteristics of the proposed system are clarified, and its validity is verified by the experiment. Regarding the experimental result, it is confirmed the characteristics of the transmission power agreed well with the theoretical result.

	Review of Power Converter Topologies for Electrochemical Impedance Spectroscopy of Lithium-Ion Batteries By Hamzeh BEIRANVAND	[View] [Download]
Abstract: Frequency domain impedance of Li-ion batteries contains valuable information about the state of charge (SOC) and state of health (SOH). Normally, electrochemical impedance spectroscopy (EIS) is performed during the relaxation of battery cells. However, performing EIS during the batteries operation has been achieved through switching power converters. This paper reviews the power converter topologies for both online and offline Electrochemical Impedance Spectroscopy (EIS) characterization of batteries. The information that can be extracted from EIS Nyquist plots are discussed. Comparative analysis between converter topologies is presented. Finally, challenges are identified and new converter topologies are proposed for further consideration in online/offline EIS characterization.