• Title/Summary/Keyword: Electric vehicle batteries

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EXPLORING THE FUEL ECONOMY POTENTIAL OF ISG HYBRID ELECTRIC VEHICLES THROUGH DYNAMIC PROGRAMMING

  • Ao, G.Q.;Qiang, J.X.;Zhong, H.;Yang, L.;Zhuo, B.
    • International Journal of Automotive Technology
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    • v.8 no.6
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    • pp.781-790
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    • 2007
  • Hybrid electric vehicles(HEV) combined with more than one power sources have great potential to improve fuel economy and reduce pollutant emissions. The Integrated Starter Generator(ISG) HEV researched in this paper is a two energy sources vehicle, with a conventional internal combustion engine(ICE) and an energy storage system(batteries). In order to investigate the potential of diesel engine hybrid electric vehicles in fuel economy improvement and emissions reduction, a Dynamic Programming(DP) based supervisory controller is developed to allocate the power requirement between ICE and batteries with the objective of minimizing a weighted cost function over given drive cycles. A fuel-economy-only case and a fuel & emissions case can be achieved by changing specific weighting factors. The simulation results of the fuel-economy-only case show that there is a 45.1% fuel saving potential for this ISG HEV compared to a conventional transit bus. The test results present a 39.6% improvement in fuel economy which validates the simulation results. Compared to the fuel-economy-only case, the fuel & emissions case further reduces the pollutant emissions at a cost of 3.2% and 4.5% of fuel consumption with respect to the simulation and test result respectively.

Computational Simulation on Power Prediction of Lithium Secondary Batteries by using Pulse-based Measurement Methods (펄스 측정법에 기반한 리튬이차전지 출력 측정에 관한 전산 모사)

  • Park, Joonam;Byun, Seoungwoo;Appiah, Williams Agyei;Han, Sekyung;Choi, Jin Hyeok;Ryou, Myung-Hyun;Lee, Yong Min
    • KEPCO Journal on Electric Power and Energy
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    • v.1 no.1
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    • pp.33-38
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    • 2015
  • Energy storage systems (ESSs) have been utilized widely in the world to optimize the power operation system and to improve the power quality. As lithium secondary batteries are the main power supplier for ESSs, it is very important to predict its cycle and power degradation behavior. In particular, the power, one of the hardest electrochemical properties to measure, needs lots of resources such as time and facilities. Due to these difficulties, computer modelling of lithium secondary batteries is applied to predict the DC-IR and power value during charging and discharging as a function of state of charge (SOC) by using pulse-based measurement methods. Moreover, based on the hybrid pulse power characteristics (HPPC) and J-Pulse (JEVS D 713, Japan Electric Vehicle Association Standards) methods, their electrochemical properties are also compared and discussed.

A Survey on Measurement and Estimation Methods for State of Health of EV Lithium-ion Batteries (전기 자동차 리튬-이온 배터리 SOH 측정 및 추정 방법에 대한 조사연구)

  • Koog-Hwan Oh;Hyun-Chang Cho
    • Journal of Sensor Science and Technology
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    • v.32 no.6
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    • pp.462-469
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    • 2023
  • Electric vehicles (EVs) have recently been in the spotlight and have been rapidly developed to reduce the carbon emission with respect to the transport sector. Most EVs currently employ lithium-ion batteries (LIBs) as power sources because they have a higher energy density and a lower self-discharge than other batteries. However, the LIBs cannot respond to high power demands when the state of health (SOH) falls below 80%. Therefore, the SOH of the LIBs must be accurately measured or estimated. To date, many methods have been studied and proposed for measuring or estimating the SOH. In this paper, representative methods among them are reclassified and introduced.

Study of electric vehicle battery reliability improvement

  • Ismail, A.;Jung, W.;Ariffin, M.F.;Noor, S.A.
    • International Journal of Reliability and Applications
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    • v.12 no.2
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    • pp.123-129
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    • 2011
  • Due to restriction of vehicle emissions and high demand for fossil fuels nowadays, car manufacturers around the world are looking into alternative ways in introducing new car model that would vastly captured the market. Thus, Electric Vehicle (EV) has been further developed to take the advantage of the current global issues on price of fossil fuels and impact on the environment. Since car battery plays the crucial role on the overall performance of EV, many researchers have been working on improving the component. This paper focused on the reliability of EV battery which involves recognizing failure types, testing method and life prediction method. By focusing on these elements, the reliability feature being identified and as a result the batteries life will be prolonged.

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A 20kHz Inverter for Inductive Charging System of Electric Vehicle (전기자동차 비접촉식 충전시스템을 위한 20kHz 인버터 설계)

  • Kim, Chul-Woo;Kim, Sang-Beom;Soh, Joon-Young;Lim, You-Seok
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1175-1176
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    • 2011
  • Electric Vehicle Supply Equipment(EVSE) is a system or an equipment to supply electric power for charging the traction batteries on the electric vehicle. EVSEs are classified with a conductive charging system and an inductive charging system by the power transfer method. Inductive charging systems are necessary to use high frequency converters to increase the output power and to reduce the size of the charging systems. In this paper, a 20kHz inverter for inductive charging system has been designed and PSCAD/EMTDC have been used to simulate the output characteristics of the 20kHz inverter.

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Technologies and Patent Applications for Battery Electric Vehicle (배터리전기자동차의 기술동향 및 특허출원동향)

  • Cho, Mann;Lee, Chang-Hoan
    • Journal of Energy Engineering
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    • v.21 no.1
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    • pp.86-108
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    • 2012
  • $CO_2$ reduction, energy security, and emission reduction are the critical issues in the current automotive industry. As one of the solutions to these issues, Battery Electric Vehicle is attracting attention recently. Advanced battery electric drive vehicle require batteries, power electronics and electrical machines to function. These devices allow the vehicle to use energy from the battery to assist in the propulsion of the vehicle. In this paper, the main feature of these technologies are briefly introduced and recent trends of patent applications are described.

Development of Electric Equipment for Plug-in Hybrid Electric Vehicle (플러그인 하이브리드 전기자동차용 전장품 개발)

  • Lee, Jong-Chan;You, Doo-Young;Bang, Lee-Seok;Choi, Uk-Don;Lee, Se-Hyun
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.318-319
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    • 2011
  • Many countries are concentrating on the development of electric vehicle technology with increasing concerns about the global environment. Along with these concerns, plug-in hybrid electric vehicles(PHEVs) are being developed as environment-friendly cars which reduce greenhouse gas emissions and also eliminate the problem of range anxiety associated to all-electric vehicles, because the combustion engine works as a backup when the batteries are depleted. In this paper, electric equipments of the PHEV which meet the target specifications were developed, and their performance was proven through confirmatory testing on the PHEV at Korea Automotive Technology Institute(KATECH).

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The Status and outlook of Propulsion System for Electric Powered Personal Air Vehicles (전기 동력 Personal Air Vehicle의 추진시스템 현황 및 전망)

  • Lee, Sun-Kyoung;Huh, Hwan-Il
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.183-186
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    • 2011
  • In this paper, we present some results of power analyses, and weight estimation on electric propulsion systems for Personal Air Vehicles(PAV) applications. When hybrid electric propulsion is adopted, its power performance using fuel cells and batteries is inferior to that of internal combustion engines for 1,000 kg PAV. However, hybrid electric propulsion systems may replace IC engines when energy density and power density is over $0.75kW{\cdot}hr/kg$and 2.5 kW/kg, respectively.

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A High Efficiency Converter for Battery Hybrid Power System of Electric Vehicles (전기자동차의 배터리 하이브리드 전원시스템용 고효율 컨버터)

  • Tran, Dai-Duong;Lee, Hyun-Hwa;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.333-334
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    • 2016
  • This paper proposes a new cascoded configuration for hybrid energy storage system (HESS) which consists of batteries and supercapacitor (SC) for Electric Vehicle applications. In this configuration,a resonant LLC converter is interfacedin series with a battery module and it converts a part of the energy from the batteries and transfer it to the dc-link bus. The LLC converter is controlled by a phase-shift angle between the primary and secondary switches to maintain a constant dc-link voltage and obtain soft-switching conditions for all the primary switches. By placing the SC moduleina cascoded concept, the rated voltage of SC can be reduced significantly compared with the conventional topologies. It helps save the cost and reduce the number of SC cells. The proposed configuration can operate with four different modes: feeding load, acceleration, regenerative braking andSC charging. A scaled-down prototype converter (2 kW, 600V output) is designed and tested to verify the advantages of the proposed topology. The maximum efficiency obtained with the proposed topology is 99%.

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Conceptual Design and Simulation of an Unmanned Battery Exchangeable Electric Bus Management System (배터리 자동 교체형 전기버스 운영 시스템의 개념적 설계 및 시뮬레이션)

  • Kim, Han-Ur;Park, Jun-Seok;Oh, Ha-Ryoung;Seong, Yeong-Rak
    • KIPS Transactions on Computer and Communication Systems
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    • v.3 no.3
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    • pp.63-72
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    • 2014
  • The exchangeable battery electric bus is an eco-friendly public transportation vehicle. Due to the technological limitation, however, it should repeatedly change batteries with charged ones. The unmanned battery exchangeable electric bus being studied in Korea can exchange batteries automatically by using a battery swapping system. In this paper, we propose an unmanned battery exchangeable electric bus management system. The proposed system provides two services: the bus information service and the battery change scheduling service. The bus information service is the existing traditional metropolitan area bus information systems, which inform bus passengers how long they should wait for the buses. Our second service assigns a low-battery bus, which needs to change the batteries, to the battery swapping system, which stores fully-charged batteries. To validate the proposed system, we model the system by using the DEVS formalism. The simulation result shows that the proposed system provides the services properly.