• 제목/요약/키워드: electric battery

검색결과 1,196건 처리시간 0.032초

베타전지 기술동향 분석 (Trends in Betavoltaic Battery Technology)

  • 강태욱;최병건;박성모;박경환;이재진;강성원
    • 전자통신동향분석
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    • 제32권6호
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    • pp.40-47
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    • 2017
  • One of the main technical constraints of a conventional battery is the limited lifetime of electric energy supplied. With self-power generation using an internal radioisotope as an emitter of beta particles, and a PN-junction semiconductor as an absorber of the beta particles, a betavoltaic battery can provide electric energy to electric devices in a semi-permanent manner. Hence, a betavoltaic battery can be adopted as the solution to the power source issue of IoT devices placed in locations that people cannot easily access, such as in the deep sea, a desert, and space, and requiring a long operation time without an electrical charging. This paper covers the current trends in betavoltaic batteries including issues regarding their technology, application, and patents.

하이브리드/전기 자동차 배터리 냉각 시스템의 냉각수 유동 특성이 냉각 성능에 미치는 영향에 대한 해석적 연구 (Effect of Coolant Flow Characteristics in Cooling Plates on the Performance of HEV/EV Battery Cooling Systems)

  • 오현종;박성진
    • 한국자동차공학회논문집
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    • 제22권3호
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    • pp.179-185
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    • 2014
  • Average temperature and temperature uniformity in a battery cell are the important criteria of the thermal management of the battery pack for hybrid electric vehicles and electric vehicles (HEVs and EVs) because high power with large size cell is used for the battery pack. Thus, liquid cooling system is generally applied for the HEV/EV battery pack. The liquid cooling system is made of multiple cooling plates with coolant flow paths. The cooling plates are inserted between the battery cells to reject the heat from batteries to coolant. In this study, the cooling plate with U-shaped coolant flow paths is considered to evaluate the effects of coolant flow condition on the cooling performance of the system. The counter flow and parallel flow set up is compared and the effect of flow rate is evaluated using CFD tool (FLUENT). The number of counter-flows and flow rate are changed and the effect on the cooling performance including average temperature, differential temperature, and standard deviation of temperature are investigated. The results show that the parallel flow has better cooling performance compared with counter flow and it is also found that the coolant flow rate should be chosen with the consideration of trade-off between the cooling performance and pressure drop.

리튬폴리머 전지의 전기적 모델링 (Electrical Modeling of Lithium-Polymer Battery)

  • 임재관;임덕영;;최재호;정교범
    • 전력전자학회논문지
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    • 제16권2호
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    • pp.199-207
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    • 2011
  • 전기 장치용 리튬폴리머 전지의 전기적 모델링은 전기에너지 공급시스템의 특성을 파악하는데 매우 중요하다. 본 논문은 리튬폴리머 전지의 동적특성을 모사하기 위한 전기적 등가 모델을 제안하였다. 리튬폴리머 전지의 충/방전 실험은 Maccor 8500 충방전시험장치를 사용하였다. 측정된 데이터를 이용하여 전지의 R-C 값을 선정하였으며, 선정된 값은 다항식 함수와 지수 함수를 사용하여 수식으로 나타내었다. 시뮬레이션 결과와 실험결과를 비교하여 제안된 모델의 타당성을 검증하였다

Modeling of Lithium Battery Cells for Plug-In Hybrid Vehicles

  • Shin, Dong-Hyun;Jeong, Jin-Beom;Kim, Tae-Hoon;Kim, Hee-Jun
    • Journal of Power Electronics
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    • 제13권3호
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    • pp.429-436
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    • 2013
  • Online simulations are utilized to reduce time and cost in the development and performance optimization of plug-in hybrid electric vehicle (PHEV) and electric vehicles (EV) systems. One of the most important factors in an online simulation is the accuracy of the model. In particular, a model of a battery should accurately reflect the properties of an actual battery. However, precise dynamic modeling of high-capacity battery systems, which significantly affects the performance of a PHEV, is difficult because of its nonlinear electrochemical characteristics. In this study, a dynamic model of a high-capacity battery cell for a PHEV is developed through the extraction of the equivalent impedance parameters using electrochemical impedance spectroscopy (EIS). Based on the extracted parameters, a battery cell model is implemented using MATLAB/Simulink, and charging/discharging profiles are executed for comparative verification. Based on the obtained results, the model is optimized for a high-capacity battery cell for a PHEV. The simulation results show good agreement with the experimental results, thereby validating the developed model and verifying its accuracy.

2.3 kW급 전기자동차 배터리팩용 냉각 장치의 열전달 특성에 관한 해석적 연구 (Numerical Analysis of Heat Transfer Characteristics of Cooling System for 2.3 kW EV Battery Pack)

  • 성동민;박용석;성홍석;서정세
    • 한국기계가공학회지
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    • 제21권6호
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    • pp.44-49
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    • 2022
  • The improvement in the battery performance and life using a battery thermal management system directly affects the improvement in the performance, life, and energy efficiency of electric vehicles. Therefore, this study numerically analyzed the heat exchange processes between the coolant inside the cooling plate channel and the heat generated by the battery. The cooling performance was analyzed based on the average temperature, temperature uniformity, and the maximum and minimum temperature differences of the battery. A performance difference existed depending on the coolant inlet temperature but showed the same tendency of cooling performance according to the shape of each plate's channel. Type 1 showed the best results in terms of battery temperature uniformity, which is the most important measure of battery performance; Type 2 showed the best results in terms of the average temperature of the battery; and Type 3 showed the best results in terms of the maximum and minimum temperature differences of the battery compared with that of the other cooling plates.

Electric Battery Sensor의 Car Start State예측 알고리즘 개발을 위한 차량 전기 시뮬레이터 개발 (Developement of Vehicle Electric Simulator system for alorithm of Car Start State test)

  • 신상호;고국원;노희진
    • 한국산학기술학회:학술대회논문집
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    • 한국산학기술학회 2011년도 춘계학술논문집 1부
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    • pp.454-457
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    • 2011
  • 논문에서는 EEM 시뮬레이터를 개발하여 개발되어진 시뮬레이터를 Voltage, Current, Resistance의 데이터를 추출하고 실차를 이용하여 시동 테스트를 통한 자동차 시동시 순간적으로 흐르는 Voltage, Current, Resistance의 순간 변화량을 추출하여 과 각각의 특성을 비교하여 Battery의 SOC, SOH를 구하고 자동차의 Battery 를 획기적으로 관리할 수 있는 시뮬레이터를 개발하려 한다.

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Modeling and an Efficient Com bined Control Strategy for Fuel Cell Electric Vehicles

  • Lee, Nam-Su;Shim, Seong-Yong;Ahn, Hyun-Sik;Choi, Joo-Yeop;Choy, Ick;Kim, Do-Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.1629-1633
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    • 2004
  • In this paper, we first implement the simulation environment to investigate the efficient control method of a Fuel Cell Electric Vehicle (FCEV) system with battery. The subsystems of a FCEV including the fuel cell system, the electric motor (including the power electronics) and the tansmission (reduction gear), and the auxiliary power source (battery) are mathematically fomulated and coded using the Matlab/Simulink software. Some examples are given to show the capabilities of the modeled system and d a basic control strategy is examined for the economic energy distribution between the fuel cell and the auxiliary power source. It is illustrated by simulations that the actual vehicle velocity follows the given desired velocity pattern while both SOC control and power distribution control are being performed.

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전기자동차 완속충전기용 스마트 분전반 및 그 제어방법 (Smart Panel Board for EV Standard Chargers and Its Control Method)

  • 김명수;홍순찬
    • 전력전자학회논문지
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    • 제19권6호
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    • pp.511-521
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    • 2014
  • This study proposes an electric vehicle (EV) smart panel board and its control method on the basis of charging scheduling. The proposed system consists of batteries, a three-phase battery charger, three single-phase inverters, transfer switches for electric power distribution, and a controller. The three-phase battery charger usually charges the batteries at midnight when electric rates are cheap and in light load. When the electric power consumption of the EV standard chargers connected to one phase of the power line is relatively large or when a blackout occurs, the electric power stored in the battery is supplied by discharging through the inverters to the EV standard chargers. As a result, the value of peak load and the charging electric power quantity supplied from a utility grid are reduced, and the current unbalance is improved. The usefulness of the proposed system is confirmed through simulations, experiments, and case studies.

전기 자동차 무선 충전 시스템 기술 동향 및 분석 (A Technology Trend and Analysis of Electric Vehicle Wireless Charging System)

  • 임종균;이동용
    • 한국전자통신학회논문지
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    • 제16권2호
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    • pp.255-260
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    • 2021
  • 최근 화석연료의 고갈로 인해 전기 자동차의 중요성이 점차 커지고 있다. 전기 자동차를 사용하기 위해서는 자동차에 내장된 배터리를 수시로 충전해야 한다. 전기 자동차는 소음, 진동에 있어 매우 뛰어난 성능을 구현한다. 하지만 배터리의 한계상 1회 충전 시 주행거리가 내연 자동차보다 상당이 짧으며, 배터리 충전 시간도 주유 시간에 비해 상대적으로 매우 오래 걸린다는 단점이 있다. 전기 자동차용 배터리를 충전하는 방식은 플러그인 방식과 무선 충전 방식이 있다. 본 논문에서는 전기 자동차용 무선 충전 기술에 대한 소개와 주요 국가의 기술 개발 현황 및 표준을 소개하였다.

소형 전기자동차 CAN 데이터 기반의 시뮬레이션 모델 개발 (Development of a Simulation Model based on CAN Data for Small Electric Vehicle)

  • 이홍진;차준표
    • 한국분무공학회지
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    • 제27권3호
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    • pp.155-160
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    • 2022
  • Recently, major developed countries have strengthened automobile fuel efficiency regulations and carbon dioxide emission allowance standards to curb climate change caused by global warming worldwide. Accordingly, research and manufacturing on electric vehicles that do not emit pollutants during actual driving on the road are being conducted. Several automobile companies are producing and testing electric vehicles to commercialize them, but it takes a lot of manpower and time to test and evaluate mass-produced electric vehicles with driving mileage of more than 300km on a per-charge. Therefore, in order to reduce this, a simulation model was developed in this study. This study used vehicle information and MCT speed profile of small electric vehicle as basic data. It was developed by applying Simulink, which models the system in a block diagram method using MATLAB software. Based on the vehicle dynamics, the simulation model consisted of major components of electric vehicles such as motor, battery, wheel/tire, brake, and acceleration. Through the development model, the amount of change in battery SOC and the mileage during driving were calculated. For verification, battery SOC data and vehicle speed data were compared and analyzed using CAN communication during the chassis dynamometer test. In addition, the reliability of the simulation model was confirmed through an analysis of the correlation between the result data and the data acquired through CAN communication.