• Title/Summary/Keyword: Ni-MH battery

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Performance Assessment of a Lithium-Polymer Battery for HEV Utilizing Pack-Level Battery Hardware-in-the-Loop-Simulation System

  • Han, Sekyung;Lim, Jawhwan
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1431-1438
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    • 2013
  • A pack-level battery hardware-in-the-loop simulation (B-HILS) platform is implemented. It consists of dynamic vehicle models using PSAT and multiple control interfaces including real-time 3D driving and GPS mode. In real-time 3D driving mode, user can drive a virtual vehicle using actual drive equipment such as steering wheel and accelerator to generate the cycle profile of the battery. In GPS mode, actual road traffic and terrain effects can be simulated using GPS data while the trajectory is displayed on Google map. In the latter part of the paper, several performance tests of an actual lithium-polymer battery pack are carried out utilizing the developed system. All experiments are conducted as parts of actual development process of a commercial battery pack adopting 2nd generation Prius as a target vehicle model. Through the experiments, the low temperature performance and fuel efficiency of the battery are quantitatively investigated in comparison with the original nickel-metal hydride (NiMH) pack of the Prius.

Optimal Operation of EV Electrical Power System with Ni-MH's BMS(Battery Management System) (Ni-MH용 전지관리장치를 이용한 EV 전력시스템 최적운전)

  • 이종찬
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.66-69
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    • 2000
  • 전기자동차에서 주 에너지원은 축전지이다. 현재전기자동차용 축전지는 에너지 밀도 및 파워 밀도가 커지고 있지만 기존의 자동차에 비해서 주행거리가 짧다. 그래서 전지관리장치(Battery management System : BMS) 개발목적은 효율적으로 배터리를 관리하여 전기자동차의 전력시스템을 최적으로 운전하는 데 있다. 주행 중 즉 모터링시 축전시의 상태에 따라 인버터의 운전을 최적으로 하기 위한 제어방식을 도입하고 충전시에도 축전시의 충전상태에 따른 충전모드를 선택하여 제어하는 방식을 도입하고자 한다. 전기자동차 전력시스템의 최적운전을 실현할 수 있고 이를 통해 주행거리를 증대시킬수 있는 전기자동차 용 Ni-MH 전지 제어 알고리즘을 이용하여 개발한 BMS에 대해 소개한다.

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NiMH battery Modeling and Test considering C-rate, Temperature and SOC (C-rate, 온도, SOC를 고려한 NiMH 배터리 모델링 및 실험)

  • Kong, Seil;Kim, Daesik;Cha, Hanju
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.413-414
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    • 2012
  • 본 논문에서는 C-rate, 온도, SOC (State-of-Charge, 잔존용량)를 고려하여 NiMH 배터리를 모델링하였고, 시뮬레이션 결과를 배터리 실험 결과와 비교하였다. 제안한 배터리 모델은 1차 테브난 등가회로를 기반으로 구성하였으며 Matlab/Simulink 환경에서 구현하였다. 모델을 구현하기 위한 실험으로는 정전류, 펄스전류 실험을 하여 가변온도와 다양한 C-rate에서 변하는 파라미터를 도출하였고, 도출한 파라미터는 룩업 테이블을 이용하여 배터리 모델에 적용하였다. 제안된 배터리 모델을 짧은 시간동안 불규칙하게 변하는 전류 패턴에 대한 시뮬레이션과 실험 파형을 통하여 배터리 모델의 성능을 검증하였다.

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Development of Hybrid Fuel Cell UPS System (하이브리드 연료전지 UPS 시스템 개발)

  • Hyun, Deok-Su;Jang, Min-Ho;Kim, Tae-Sin;Oh, Se-Woong
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.235-235
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    • 2009
  • 본 연구는 친환경 신새생 에너지를 이용한 전력 시스템을 개발함으로써 전력 IT인 Smart Grid 기술 활용과 더불어 예기치 못한 정전으로부터 중요한 전자 장비를 보호하는 UPS 기능을 갖는 친환경 3.0kW급 하이브리드 연료전지 UPS 시스템을 개발하는 것이다. 이를 위하여 시뮬레이션 기법을 이용하여 소형 경량화에 따른 구성 부품 배치 합리화 및 발생열 최적화 설계를 도출하였으며, 연료전지용 장수명 밀폐형 Ni-MH전지, 고효율 전력변환기, 하이브리드 PMS의 설계 및 제작과 개발된 3kW급 하이브리드 연료전지 UPS 시스템 기능 및 성능 평가를 공인 기관에서 검증받았다. 본 연구를 통하여 개발된 연료전지용 장수명 100Ah급 밀폐형 Ni-MH전지는 밀폐화와 더불어 장수명화 및 저온 방전 특성이 우수한 뿐만 아니라 KS규격을 모두 만족하였으며, 내구성도 DOD100%에서 1,093cycle의 결과를 얻을 수 있었다. 또한, 전지 설계 및 제작 기술뿐만 아니라 양산화 관련 기술들이 개발되어 향후 고용량, 고출력, 장수명의 축전지가 필요로 하는 분야에 적용될 수 있는 기반이 마련되었다. 또한 고효율 전력 변환기 및 연료전지과 축전지를 조절하는 PMS을 탑재한 소형 경량화 된 친환경 IT제품의 이미지를 구현하였다.

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Charge/discharge and electrochemical characteristics of α-Ni(OH)2/γ-FeOOH(an) battery (α-Ni(OH)2/γ-FeOOH(an) 전지의 충·방전 및 전기화학적 특성)

  • Choi, Byung-Hyun;Hwang, Kum-Sho;Chung, Won-Sub;Kim, In-Gon
    • Transactions of the Korean hydrogen and new energy society
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    • v.8 no.2
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    • pp.67-78
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    • 1997
  • 현재 가장 널리 사용되고 있는 2차 전지는 Ni/cd 전지이며 카드뮴 전극의 사용으로 인해 공해 유발 문제를 가지고 있다. 그에 따라 공해 유발문제가 작은 전지를 제작하고자 하는 연구가 전세계적으로 진행되었고, 결과적으로 NiMH 전지가 개발되었다. 그러나 NiMH 전지에 사용되는 MH 전극은 희토류 토금속을 사용하기 때문에 전극 제작 비용이 비싼 단점을 가지고 있다. 본 실험에서는 자연 중 존재량이 많은 철 화합물을 음극 물질로 이용하여 공해 유발 문제와 제작비용 문제에 대한 대안을 제시하고자 하였다. 전지의 양극 물질은 Kamath에 의해 개발된 ${\alpha}-Ni(OH)_2$의 합성법을 응용, 제작하였다. 제작된 ${\alpha}-Ni(OH)_2/{\gamma}-FeOOH(an)$ 전지의 충 방전 및 전기화학적 특성을 조사하여 보고하였다.

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Hydrogneation and Electrochemical Characteristics of Gas-atomized Zr-based $AB_2$ Hydride for Ni-MH Secondary Battery (기체분무형 공정으로 제조된 Zr계 금속수소화물의 수소화반응 및 Ni-MH 2차전지 전극 특성에 관한 연구)

  • Kim, Jin-Ho;Hwang, Kwang-Taek;Kim, Byung-Kwan;Han, Jeong-Seb
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.6
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    • pp.505-511
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    • 2009
  • The hydriding and electrochemical characteristics of Zr-based $AB_2$ alloy produced by gas atomization have been extensively examined. For the particle morphology of the as-cast and gas-atomized powders, it can be seen that the mechanically crushed powders are irregular, while the atomized powder particles are spherical. The increase of jet pressure of gas atomization process results in the decrease of hydrogen storage capacity and the slope of plateau pressure significantly increases. TEM and EDS studies showed the increase of jet pressure in the atomization process accelerated the phase separation within grain of the gas-atomized alloy, which brought about a poor hydrogenation property. However, the gas-atomized $AB_2$ alloy powders produced by jet pressure of 50 bar kept up the reversible $H_2$ storage capacity and discharge capacity similar to the mechanically crushed particles. In addition, the electrode of gas-atomized Zr-based $AB_2$ alloy of 50 bar showed improved cyclic stability over that of the cast and crushed particulate, which is attributed to the restriction of crack propagation by grain boundary and dislocation with ch/discharging cycling.

A study on the activation characteristics of multi-phase Zr-based hydrogen storage alloy for Ni-MH rechargeable battery (Ni-MH 2차전지용 다상의 Zr계 수소저장합금 전극의 활성화 특성에 관한 연구)

  • Lee, Ho;Jang, Kuk-Jin;Lee, Jai-Young
    • Transactions of the Korean hydrogen and new energy society
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    • v.8 no.4
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    • pp.161-171
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    • 1997
  • $AB_2$ type Zr-based Laves phase alloys have been studied for potential application as negative electrode in Ni/MH batteries. However, They have a serious disadvantage of poor activation behavior in KOH solution. In this work, a new method of alloy design method was tried for improving Zr-based alloy activation. this method has focused on phase controlling to make multi-phase microstructure. In the case of multi-phase Zr-V-Mn-Ni shows good performance in activation, but activation mechanism has not been known. So, we were in search of elucidating this mechanism, Using morphological and electrochemical analysis, we could find that surface morphology and electocatalytic activity of the alloy change during immersion in KOH solution. V-rich second phases are selectively corroded and dissolved and then become Ni-rich phases. Resulting from these surface reaction in KOH solution, self-hydrogen charging occurs through Ni-rich phase. However, the alloy has poor cyclic durability because of such a corrosion mechanism. Therefore, finally we developed durable alloys by substitution of other alloying element.

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Improvement of Step-charging Characteristic for Ni-MH Battery by Selective Cut-off Method (선택적 충전단계절환에 의한 Ni-MH 전지의 계단충전 특성 개선)

  • 안재영;강신영;김광헌;임영철
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.4
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    • pp.273-279
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    • 1998
  • In this paper, the proposed charging system consists of step charging mode and time-sharing equalization charging mode. As $\Delta$V=O point is detected, the proposed cut-off method will selectively cut off the only battery to reach the $\Delta$V=O point, preventing serial-connected batteries from undercharging. In the start of each step, the equalization charging mode is performed to reduce the capacity difference among the batteries. Though it is added to simple circuit for selective cut-off, comparing with recently used step-charging method, this system can improve the life cycle of battery and charging efficiency, and be also very effective for preventing the batteries from overcharging and undercharging.

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Thermal Management of a Ni/MH Battery Module for Electric Vehicle (전기자동차용 Ni/MH 전지 Module의 열관리기술)

  • Kim, Junbom
    • Applied Chemistry for Engineering
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    • v.8 no.6
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    • pp.1034-1040
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    • 1997
  • Temperature distribution of battery module consists of 11 batteries of 90Ah rate is analyzed using commercial software NISA II. Equivalent thermal resistance network is used to reduce the number of element in calculating heat transfer through a medium composed of several different thermal conductivity layers. Orthotropic model is used to put different thermal conductivity values according to Cartesian coordinate. Aluminum cooling fins are inserted in the middle of batteries to reduce battery module temperature. The cooling fin at the end of the module does not necessary in reducing maximum temperature. Combined effect of front and side cooling fin is analyzed to reduce the temperature difference among batteries. The maximum temperature difference among batteries is reduced within $3^{\circ}C$ when 4 aluminum cooling tin of 1mm thickness is inserted in battery module.

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A Study on the Cycle Life Improvement of V-Ti-Ni(V-rich) Alloy as a Negative Electrode for Ni/MH Rechargeable Battery (Ni/MH 2차전지의 음극으로써 V-Ti-Ni(V-rich) 수소저장합금의 전극수명 향상에 관한 연구)

  • Kim, Ju-Wan;Lee, Seong-Man;Lee, Jae-Yeong
    • Transactions of the Korean hydrogen and new energy society
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    • v.7 no.1
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    • pp.39-44
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    • 1996
  • The discharge capacity of V-Ti-Ni(V-rich) metal hydride electrode during the charge-discharge cycling was investigated in KOH electrolyte. All electrodes were degraded within 25 cycles. To investigate the cause of the degradation phenomena impedance measurements were performed by using E.I.S(electrochemical impedance spectroscopy). The surfaces of the degraded electrodes were examined by Auger electron spectroscopy (AES). It was observed that all electrodes were covered with oxygen from the surface to the bulk, titanium was enriched near surface, and vanadium was dissolved from the surface to the bulk.

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