• Title/Summary/Keyword: Secondary Battery

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Cell Balancing to Improve Safety and Performance against Unbalanced Voltage between Secondary Battery Cells (2차전지 셀(Cell) 간의 불균형 전압 발생에 대한 안전성 및 성능향상을 위한 셀 밸런싱(Cell Balancing))

  • Yongho Yoon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.24 no.4
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    • pp.141-146
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    • 2024
  • Energy Storage System(ESS) have been developed to store and efficiently utilize energy, transitioning from the traditional method of producing and consuming energy immediately via fossil fuels and generators. With the advancement of this technology, Battery Management System(BMS) that manage Li-ion batteries at the cell level play a crucial role in enhancing battery performance, lifespan, and safety. Among the BMS functions, cell balancing, which aligns the imbalanced voltages of cells, is essential for optimizing capacity in devices like ESS. It ensures all cells maintain the same voltage and capacity, improving performance and output stability. Therefore, this paper examines the operational characteristics of the cell balancing method within BMS when charging an imbalanced Li-ion battery.

Development of 100kW Grid-Connected PCS for Vanadium Redox flow Battery (바나듐 레독스 플로우 전지용 100kW급 계통연계형 PCS 개발)

  • Choi, Eun-Sik;Lee, Chung-Woo;Ryu, Kang-Yeul;Kang, Byung-Kwan;Oh, Seung-Hun;Lee, Yun-Jae;Koh, Kwang-Soo;Kim, Hee-Jung
    • Proceedings of the KIPE Conference
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    • 2013.11a
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    • pp.115-116
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    • 2013
  • Recently environmental problems such as greenhouse gas emissions has become a global problem. As a result, the current that can be easily used to Petroleum and coal reserves of fossil energy and environmental issues, coupled with the limitations of this finding for renewable energy to replace the movement is spreading around the world. Among them Energy Storage System with secondary battery technology has been increased interest in, Redox flow batteries, unlike the conventional theory, the life of the rechargeable battery almost no restrictions existing lithium-ion batteries 10 times more than the life of the road. In this paper, power plant or power system, installed in a building that can cope with the rapid increase in demand for power redox flow battery for 100kW PCS will be introduced.

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Electrochemical Characteristics of Carbon-coated LiFePO4 as a Cathode Material for Lithium Ion Secondary Batteries

  • Shin, Ho-Chul;Lee, Byung-Jo;Cho, Won-Il;Cho, Byung-Won;Jang, Ho
    • Journal of the Korean Electrochemical Society
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    • v.8 no.4
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    • pp.168-171
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    • 2005
  • The electrochemical properties of $LiFePO_4$ as a cathode for Li-ion batteries were improved by incorporating conductive carbon into the $LiFePO_4$. X-ray diffraction analysis and SEM observations revealed that the carbon-coated $LiFePO_4$ consisted of fine single crystalline particles, which were smaller than the bare $LiFePO_4$. The electrochemical performance of the carbon-coated $LiFePO_4$ was tested under various conditions. The carbon-coated $LiFePO_4$ showed much better performance in terms of the discharge capacity and cycling stability than the bare $LiFePO_4$. The improved electrochemical performances were found to be attributed to the reduced particle size and enhanced electrical conductivity of the $LiFePO_4$ by the carbon.

Performance of the Electrode for All-vanadium Redox Flow Battery (바나듐 레독스 흐름 전지용 전극의 성능 평가)

  • IN, DAE-MIN;SONG, YOUNG-JOON;LEE, DAE-YEOP;RYU, CHEOL-HWI;HWANG, GAB-JIN
    • Journal of Hydrogen and New Energy
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    • v.28 no.2
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    • pp.200-205
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    • 2017
  • The three electrodes (carbon felt) were tested in all-vanadium redox flow battery (VRFB) to confirm the its usefulness. The electrode property was measured by the CV (cyclic voltammetry) method. The current ratio of maximum peak(IPA/IPC) in GF040BH5 and GF051BH3 had almost the same value compared to that in XF30A. The performances of VRFB using the each electrode were measured during 5 cycles of charge-discharge at the current density of $60mA/cm^2$. An average energy efficiency of the VRFB was 77.8%, 77.3%, and 79.2% for XF30A, GF040BH5 and GF051BH3, respectively. It was confirmed from the data that GF040BH5 and GF051BH3 is well suited for use in a VRFB as a electrode, like XF30A.