• Title/Summary/Keyword: Ni-MH battery

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Railway system standby power Nickel metal hydride battery (철도시스템비상전원용 니켈수소(NiMH)전지)

  • Park, Dong-Pil
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.636-645
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    • 2006
  • In order to use railway system standby power, produced 160Ah NiMH battery that would be able to substitute the lead acid battery or NiCd battery form which contain the toxic material in environment, using parallel connected 80Ah NiMH battery. And in order to develop proper electrode in the 160Ah NiMH battery, tested high rate discharge performance of the ternary electrolyte. 160Ah NiMH battery evaluated the various test in order to use railway system standby power.

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A Feasibility Study of Low-Cost Hybrid Fuel-Cell System for Ship Auxiliary Power (선박 보조전원을 위한 저가형 하이브리드 연료전지 시스템 적용 타당성 연구)

  • Yang, Geun Ryoung;An, Sang Yong;Choo, Jin Hoon
    • New & Renewable Energy
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    • v.9 no.4
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    • pp.3-12
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    • 2013
  • This paper proposes the hybrid fuel cell system that can solve disadvantages of existing fuel cell system and ensure high reliability and high stability. The system consists of PEM fuel cell, Ni-MH battery and power management system. In this system, when the power provided from the fuel cell is higher than the load power, the extra energy may be used to charge the Ni-MH battery. When the fuel cell can not provide enough energy to the load, the shortage of energy will be supplied by the Ni-MH battery. Experimental results show that the output voltage is regulated well during load variations. Also, high system efficiency is achieved.

Railway System Standby Power Nickel Metal Hydride Battery (철도시스템비상전원용 니켈수소(NiMH)전지)

  • Kim, Sung-Yong;Park, Dong-Pil
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.873-877
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    • 2009
  • In order to use railway system standby power, produced 160Ah NiMH battery that would be able to substitute the lead acid battery or NiCd battery form which contain the toxic material in environment, using parallel connected 80Ah NiMH battery. And in order to develop proper electrode in the 160Ah NiMH battery, tested high rate discharge performance of the ternary electrolyte. 160Ah NiMH battery evaluated the various test in order to use railway system standby power.

The Study of the 160Ah Ni-MH battery for Diesel Engine Starting (디젤 엔진 시동을 위한 160Ah급 니켈 수소(Ni-MH) 축전지)

  • Park, Dong Pil;Kim, Lae Hyun
    • Journal of Energy Engineering
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    • v.23 no.4
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    • pp.1-8
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    • 2014
  • For this study, a 160Ah Ni-MH battery is produced with parallel arranged two 80Ah Ni-MH batteries as an unit, in order to start diesel generator(engine) in place of Lead Acid battery or Ni-cd battery which contain indicated toxic pollutant of Environmental pollution, by high capacity Ni-MH battery. And the ternary electrolyte recipe is requested to develop proper electrodes of the 160Ah Ni-MH battery, and then the 160Ah battery can be tested at high rate discharging performance. Zn is added to negative electrode for the improvement of performance. 160Ah Ni-MH battery has been tested in various experiments for diesel engine starting. As the result, diesel engine starting is found successfully.

Development of Battery Management System for Electric Vehicle Applications of Ni/MH Battery

  • Jung Do Yang;Lee Baek Haeng;Kim Sun Wook
    • Journal of the Korean Electrochemical Society
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    • v.4 no.4
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    • pp.152-159
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    • 2001
  • Electric vehicle performance is very dependent on traction batteries. For developing the electric vehicles with high performance and good reliability, the traction batteries have to be managed to get maximum performance under various operating conditions. The enhancement of the battery performance can be accomplished by implementing battery management system (BMS) that plays important roles of optimizing the control mechanism of charge and discharge of the batteries as well as monitoring battery status. In this study the battery management system has been developed for maximizing the use of Ni/MH batteries in electric vehicle. This system provides several tasks: the control of charging and discharging, overcharge and over-discharge protection, the calculation and display of state of charge, safety and thermal management. The BMS was installed in and tested using the DEV5-5 electric vehicle developed by Daewoo Motor Co. and Institute for Advanced Engineering in Korea. The 18 modules of Panasonic Ni/MH battery, 12 V-95 Ah, were used in the DEV5-5. The high accuracy within the range of $3\%$ and the good reliability were shown in the test results. The BMS can also improve the performance and cycle life of Ni/MH battery pack as well as the reliability and safety of the electric vehicles (EV).

A study on the characteristics of inner cell pressure for sealed type Ni-MH rechargeable battery using Zr-based hydrogen storage alloy as anode (Zr-based 수소저장합금을 음극으로 사용한 밀패형 Ni-MH 2차전지의 내압특성에 관한 연구)

  • Kim, Dong-Myung;Lee, Ho;Jang, Kuk-Jin;Lee, Jai-Young
    • Transactions of the Korean hydrogen and new energy society
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    • v.8 no.2
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    • pp.79-90
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    • 1997
  • Extensive work has been done on investigating the inner cell pressure characteristics of sealed type Ni-MH battery in which Zr-Ti-Mn-V-Ni alloy is used as anode. The inner cell pressure of this type Ni-MH battery much more increases with the charge/discharge cycling than that of the other type Ni-MH battery where commercialized $AB_5$ type alloy is used as anode. The increase of inner cell pressure in the sealed type Ni/MH battery using Zr-Ti-Mn-V-Ni alloy system is mainly due to the accumulation of oxygen gas during charge/discharge cycling. The accumulation of oxygen gas arises mainly due to the low rate of oxygen recombination on the MH electrode surface during charge/discharge cycling. The difference of oxygen recombination rate between $AB_5$ type electrode and Zr-Ti-Mn-V-Ni electrode is caused by the difference of electrode reaction surface area resulting from different particle size after their activation and the difference of surface catalytic activity for oxygen recombination reaction, respectively. After EIS analysis, it is identified that the surface catalytic activity affects much more dominantly on the oxygen recombination reaction than the reaction surface area does. In order to suppress the inner cell pressure of Ni-MH battery where Zr-Ti-Mn-V-Ni is used as anode, it is suggested that the surface catalytic activity for oxygen recombination should be improved.

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SOC Estimation Based on OCV for NiMH Batteries Using an Improved Takacs Model

  • Windarko, Novie Ayub;Choi, Jae-Ho
    • Journal of Power Electronics
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    • v.10 no.2
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    • pp.181-186
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    • 2010
  • This paper presents a new method for the estimation of State of Charge (SOC) for NiMH batteries. Among the conventional methods to estimate SOC, Coulomb Counting is widely used, but this method is not precise due to error integration. Another method that has been proposed to estimate SOC is by using a measurement of the Open Circuit Voltage (OCV). This method is found to be a precise one for SOC estimation. In NiMH batteries, the hysteresis characteristic of OCV is very strong compared to other type of batteries. Another characteristic of NiMH battery to be considered is that the OCV of a NiMH battery under discharging mode is lower than it is under charging mode. In this paper, the OCV is modeled by a simple method based on a hyperbolic function which well known as Takacs’s model. The OCV model is then used for SOC estimation. Although the model is simple, the error is within 10%.

The Use of Computer Simulation in the Selfdischarge Evaluation of Ni/MH Battery for Electric Vehicle (전기자동차용 Ni/MH Battery의 자기방전율 평가를 위한 컴퓨터 시뮬레이션의 활용)

  • Jung Do Yang;Kim Myung Gyu;Park Seong Yong;Kim Sun Wook
    • Journal of the Korean Electrochemical Society
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    • v.4 no.2
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    • pp.53-57
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    • 2001
  • When an EV is parked for a long period time, the battery capacity naturally decreases due to selfdischarge. Therefore, this effect must be considered for the accurate measurement of the state of charge of EV battery. Battery selfdischarge simulations using the design of experiments among computer simulation methods are compared with experimental data for Ni/MH batteries for electric vehicles. The motivation is to predict the selfdischarge rate of the battery for electric vehicle at all temperature conditions and standing time when electric vehicle could be operated. We developed a general equation representing the seudischarge rate of the electric vehicle battery using design of experiments, and the equation is determined by temperature and standing time of the battery. We selected Ni/MH battery, 12 V-95 Ah, for pure electric vehicle for this study. ID develop the equation using design of experiments we selected temperature range of $-20^{\circ}~30^{\circ}C$ and standing time of 1 day$\~15$ days. We conducted several selfdischarge tests of Ni/MH battery to verify the integrity of the equation. The results showed that the computation values were in good agreement with experimental data.

Surface Modification of $AB_2$ Type Hydrogen Storage Alloys by Ball Milling for Ni-MH Battery (Ni-MH 전극용 $AB_2$계 수소저장합금의 볼밀링 처리에 의한 표면개질 연구)

  • Moon, Hong-Gi;Park, Choong-Nyeon;Yoo, Joung-Hyun;Park, Chan-Jin;Choi, Jeon
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.4
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    • pp.418-424
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    • 2006
  • In order to improve the activation properties of the $AB_2$ type hydrogen storage alloys for Ni-MH battery, the alloy surface was modified by employing high energy ball milling. The $Zr_{0.54}Ti_{0.45}V_{0.54}Ni_{0.87}Cr_{0.15}Co_{0.21}Mn_{0.24}$ alloy powder was ball milled for various period by using the high energy ball mill. As the ball milling time increased, activation of the $AB_2$ type composite powder electrodes were enhanced regardless of additives. When the ball milling time was small discharge capacities of the $AB_2$ type composite powder electrodes increased with the milling time. On the other hand for large milling time it decreased with increasing milling time. The maximum discharge capacity was obtained by ball milling for 3-4 min.

Preparation of Thin Nickel Foam for Nickel-Metal Hydride Battery (Ni-MH 전지용 thin nickel foam의 제조)

  • 신준호;김기원
    • Journal of the Korean institute of surface engineering
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    • v.28 no.2
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    • pp.83-91
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    • 1995
  • A new method for preparation of thin nickel foam for Ni-MH battery was investigated. In this method, fine graphite powders of $1\mu\textrm{m}$$2\mu\textrm{m}$ diameter were pasted into pores of thin polyurethane foam film in order to supply electric conducting seeds for nickel deposition by electroless plating reaction. After electroless plating, remaining polyurethane foam was removed chemically by organic solvent treatment and graphite particles also removed by ultrasonic cleaning. Porosity of formed nickel foam was about 85% During electroplating, porosity of the nickel foam decreased less than 5% up to $30\mu\textrm{m}$ coating thickness. And then it was electroplated and heat-treated to improve mechanical strength and ductility. Finally, thin nickel foam for Ni electrode of Ni-MH battery with 80% porosity and $350\mu\textrm{m}$~X$400\mu\textrm{m}$ thickness was obtained.

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