• Title/Summary/Keyword: Lithium Secondary Battery

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Battery State Estimation Algorithm for High-Capacity Lithium Secondary Battery for EVs Considering Temperature Change Characteristics

  • Park, Jinho;Lee, Byoungkuk;Jung, Do-Yang;Kim, Dong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.1927-1934
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    • 2018
  • In this paper, we studied the state of charge (SOC) estimation algorithm of a high-capacity lithium secondary battery for electric vehicles (EVs) considering temperature characteristics. Nonlinear characteristics of high-capacity lithium secondary batteries are represented by differential equations in the mathematical form and expressed by the state space equation through battery modeling to extract the characteristic parameters of the lithium secondary battery. Charging and discharging equipment were used to perform characteristic tests for the extraction of parameters of lithium secondary batteries at various temperatures. An extended Kalman filter (EKF) algorithm, a state observer, was used to estimate the state of the battery. The battery capacity and internal resistance of the high-capacity lithium secondary battery were investigated through battery modeling. The proposed modeling was applied to the battery pack for EVs to estimate the state of the battery. We confirmed the feasibility of the proposed study by comparing the estimated SOC values and the SOC values from the experiment. The proposed method using the EKF is expected to be highly applicable in estimating the state of the high-capacity rechargeable lithium battery pack for electric vehicles.

Improved Low-temperature Performance of Lithium Secondary Battery Using Energy Circulating Operation (리튬 이차전지의 저온 성능 개선을 위한 에너지 순환 작동 연구)

  • Yoon, Hyun-Ki;Ha, Sang-Hyeon;Lee, Jaein
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.6
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    • pp.421-428
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    • 2021
  • Lithium-ion secondary batteries exhibit advantageous characteristics such as high voltage, high energy density, and long life, allowing them to be widely used in both military and daily life. However, the lithium-ion secondary battery does have its limitation; for example, the output power and capacity are readily decreased due to the increased internal impedance during discharging at a lower temperature (-32℃, military requirement). Also, during charging at a lower temperature, lithium dendrite growth is accelerated at the anode, thereby decreasing the battery capacity and life as well. This paper describes a study that involves increasing the internal temperature of lithium-ion secondary battery by energy circulation operation in a low-temperature environment. The energy circulation operation allows the lithium-ion secondary battery to alternately charge and discharge, while the internal resistance of lithium-ion battery acts as a heating element to raise its own temperature. Therefore, the energy circulation operation method and device were newly designed based on the electrochemical impedance spectroscopy of the lithium-ion secondary battery to mediate the battery performance at a lower temperature. Through the energy circulation operation of lithium ion secondary battery, as a result of the heat generated from internal resistance in an extremely low-temperature environment, the temperature of the lithium-ion secondary battery increased by more than 20℃ within 10 minutes and showed a 75% discharging capacity compared with that at room temperature.

Recent Trend of Lithium Secondary Batteries for Cellular Phones (최근 휴대폰용 배터리의 기술개발 동향)

  • Lee, H.G.;Kim, Y.J.;Cho, W.I.
    • Journal of the Korean Electrochemical Society
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    • v.10 no.1
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    • pp.31-35
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    • 2007
  • In this review article, we are going to explain the recent development of lithium secondary batteries for a cellular phone. There are three kinds of rechargeable batteries for cellular phones such as nickel-cadmium, nickel-metal hydride, and lithium ion or lithium ion polymer. The lithium secondary battery is one of the most excellent battery in the point of view of energy density. It means very small and light one among same capacity batteries is the lithium secondary battery. The market volume of lithium secondary batteries increases steeply about 15% annually. The trend of R&D is focused on novel cathode materials including $LiFePO_4$, novel anode materials such as lithium titanate, silicon, and tin, elecrolytes, and safety insurance.

A Study on Safety Evaluation Method of Lithium Secondary Battery Module for Military Operation (리튬 2차전지 모듈의 전장운용을 위한 안전성 평가기법 연구)

  • Yoo, Eun Ji
    • Journal of the Korea Institute of Military Science and Technology
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    • v.17 no.3
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    • pp.378-386
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    • 2014
  • In this paper, safety evaluation method simulating battlefield environment was studied to verify military operability of commercial lithium secondary battery. Based on the MIL-STD-2105D and STANAG standards, safety tests of lithium secondary battery module were conducted, such as bullet impact, fragment impact, fast cook-off and slow cook-off. All results satisfied the safety evaluation criteria, founded on military standard. It suggests that the lithium secondary module has high potential to be applied in a military power source. The safety evaluation methods developed in this paper can be valuable to propose the new military standards for commercial lithium secondary batteries.

Technology Trends for Lithium Secondary Batteries (리튬 이차전지 기술 동향)

  • Y.H. Choi;H.S. Chung
    • Electronics and Telecommunications Trends
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    • v.38 no.5
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    • pp.90-99
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    • 2023
  • Recently, with the trend of information technology convergence and electrification, batteries are being widely used in fields such as industry, transportation, and specific applications. By 2030, the secondary battery market is expected to grow explosively by more than eight times compared with 2020 to $351.7 billion owing to the expanding adoption of electric vehicles. Depending on the electrochemical reactions in the electrode, a primary battery can only discharge through an irreversible reaction, while a secondary battery can be repeatedly charged and discharged using reversible reactions. According to the type of charge carrier ions, secondary batteries may be classified into those made of lithium, sodium, potassium, magnesium, and aluminum ions. We analyze the current status and technological issues of lithium-ion batteries, lithium-sulfur batteries, and solid-state batteries, which are representative examples of lithium secondary batteries. In addition, research trends in lithium secondary batteries are discussed.

COIN형 리튬 폴리머전지의 충방전 특성

  • 박수길;박종은;손원근;이흥기;김상욱;이주성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.497-500
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    • 1997
  • Conducting polymer is new material in lithium secondary battery. conducting polymer has a lot of merit which is flexible and good handing so that this material is used battery system, solid polymer electrolytes airs used PEO(Polyethylene oxide) and PEO/PMMA branding material adding by liquid plasticizer or lithium salt polymer electrolyte which is added liquid plasticizer, lithium salt decreased the crystallity and thermal stability is over than 13$0^{\circ}C$. it is very useful tn apply lithium secondary battery system.

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Solid Electrolyte Technologies for Next-Generation Lithium Secondary Batteries (차세대 리튬이차전지용 고체 전해질 기술)

  • Kim, K.M.;Oh, J.M.;Shin, D.O.;Kim, J.Y.;Lee, Y.G.
    • Electronics and Telecommunications Trends
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    • v.36 no.3
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    • pp.76-86
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    • 2021
  • Technologies for lithium secondary batteries are now increasingly expanding to simultaneously improve the safety and higher energy and power densities of large-scale battery systems, such as electric vehicles and smart-grid energy storage systems. Next-generation lithium batteries, such as lithium-sulfur (Li-S) and lithium-air (Li-O2) batteries by adopting solid electrolytes and lithium metal anode, can be a solution for the requirements. In this analysis of battery technology trends, solid electrolytes, including polymer (organic), inorganic (oxides and sulfides), and their hybrid (composite) are focused to describe the electrochemical performance achievable by adopting optimal components and discussing the interfacial behaviors that occurred by the contact of different ingredients for safe and high-energy lithium secondary battery systems. As next-generation rechargeable lithium batteries, Li-S and Li-O2 battery systems are briefly discussed coupling with the possible use of solid electrolytes. In addition, Electronics and Telecommunications Research Institutes achievements in the field of solid electrolytes for lithium rechargeable batteries are finally introduced.

Charging/Discharging Modeling of Lithium Secondary Battery for Estimating Cycle Characteristic (리튬2차전지의 수명성능평가를 위한 충방전특성 모델링)

  • Kim, Jae-Eon;Rho, Dae-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.6
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    • pp.1343-1354
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    • 2007
  • Secondary batteries become more important in our lives as the use of portable electric devices, such as camera, cellular phone, laptop, etc. Especially, because of their high energy densities and high voltage, lithium-ion batteries are being used in many systems. For the optimum design of such systems which include lithium-ion batteries, virtual prototype is required generally. However, since the complex chemical and physical processes are involved, the behavior of battery becomes harder to be predicted compared with that of electric and mechanic devices. This paper, proposes a new static model of lithium secondary battery, which accounts for nonlinear equilibrium potentials, rate and temperature dependencies, thermal effects, lifetime characteristic. The results of the simulation of the model are analysed and compared with experimental data to inspect their validity.

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Development of hybrid system with fuel cell and lithium secondary battery (연료전지와 리튬 이차전지의 하이브리드 시스템 개발)

  • Hwang, Sangmoon;Jung, Eunmi;Son, Dongun;Shim, Taehee;Song, Hayoung
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.143.2-143.2
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    • 2010
  • Therefore, with this development assignment we'd like to develop the hybrid system combining 800W DMFC (Direct Methanol Fuel Cell) and 1.6kW of Lithium secondary battery pack which can be applied to the most common small cart. a scooter, to secure the development capability of hundreds of Watts DMFC, the high-capacity Lithium secondary battery pack, the technology of BMS (Battery Management System) and the development technology of hybrid system. DMFC, in fact, has lower energy efficiency than PEMFC (Polymer Electrolyte Membrane Fuel Cell); however, it has several advantages in terms of fuel storage and use. It is pretty easy to be stored and used without any additional colling and heating devices because of its insensitive liquid methanol to temperature. In conclusion, DMFC system is the most suitable device for small mobile vehicles.

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The Study on Thermal Modeling and Charge Capacity Estimation for Lithium Secondary Battery (리튬 2차 전지의 열적 모델링 및 용량 예측에 관한 연구)

  • Kim, Jong-Won;Cho, Hyun-Chan;Kim, Kwang-Sun;Jo, Jang-Gun;Lee, Jung-Su;Hu, Bin
    • Journal of the Semiconductor & Display Technology
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    • v.6 no.1 s.18
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    • pp.53-57
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    • 2007
  • In this paper, the intelligent estimation algorithm is developed for residual quantity estimate of lithium secondary cell and we suggest the control algorithm to get battery SOC through thermal modeling of electric cell. Lithium secondary cell gives cycle life, charge characteristic, discharge characteristic, temperature characteristic, self-discharge characteristic and the capacity recovery rate etc. Therefore, we make an accurate estimate of the capacity of battery according to thermal modeling to know the capacity of electric cell that is decreased by various special quality of lithium secondary cell. And we show effectiveness through comparison of value as result that use simulation and fuzzy logic.

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