• 제목, 요약, 키워드: Lithium Secondary Battery

검색결과 315건 처리시간 0.051초

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.

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

  • 유은지
    • 한국군사과학기술학회지
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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.

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

  • 이형근;김영준;조원일
    • 전기화학회지
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    • v.10 no.1
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    • pp.31-35
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    • 2007
  • 이 리뷰를 통하여, 휴대폰용 리튬이차전지의 최근 기술동향을 설명하였다. 휴대폰용 이차전지로는 니카드, 니켈-금속수소, 리튬이온 혹은 리튬이온폴리머의 세 가지 형태의 전지가 있으며, 리튬 이차전지가 에너지밀도 측면에서 가장 성능이 우수하다. 즉, 동일한 용량을 갖는 이차전지 가운데 가장 작고 가벼운 것은 리튬이차전지이다. 이러한 리튬이차전지의 시장은 매년 약 15%의 높은 성장을 기록하고 있다. 연구개발은 $LiFePO_4$를 포함하는 새로운 양극, $Li_4Ti_5O_{10}$, Si, 주석 등의 새로운 음극소재, 새로운 전해질과 안정성 확보에 관한 것을 중심으로 진행되고 있다.

리튬 이온 이차전지의 Quick Charge용 음극소재에 관한 연구 (A Study on Quick Charge Anode Materials for Lithium Ion Secondary Battery)

  • 강태경;홍종기
    • 한국기계기술학회지
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    • v.19 no.3
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    • pp.385-389
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    • 2017
  • Lithium ion batteries have been extensively used in portable electronic devices due to their high energy density and long cycle life. Recently, lithium ion batteries are required to run conditions that drive up to 1.5C, 2.0C, or higher in order to produce quick charge secondary cells, but the life degradation and safety concerns and rising. In other words, as the number of repetitions of the charge and discharge increases, the binding between the active materials and the ionic conductors becomes loose, and the contact resistance between the particles increases, and due to the increased resistance of the electrode, the battery performance is degraded, and during the life cycle degradation of cathode and anode materials occurs, and it is directly linked to life and safety issues. This study aims to improve the quick charge performance by improving the lithium ion material.

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

  • 황상문;정은미;손동언;심태희;송하영
    • 한국신재생에너지학회:학술대회논문집
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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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리튬 2차 전지의 열적 모델링 및 용량 예측에 관한 연구 (The Study on Thermal Modeling and Charge Capacity Estimation for Lithium Secondary Battery)

  • 김종원;조현찬;김광선;조장군;이정수;호빈
    • 반도체디스플레이기술학회지
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    • v.6 no.1
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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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The Current Situation for Recycling of Lithium Ion Batteries

  • Hiroshi Okamoto;Lee, Sang-Hoon
    • 대한전자공학회:학술대회논문집
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    • pp.252-256
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    • 2001
  • The rapid development of communication equipment and information processing technology has led to a constant improvement in cordless communication. Lithium ion batteries used in cellular phones and laptop computers, in particular, have been in the forefront of the above revolution. These batteries use high value added raw materials and have a high and stable energy output and are increasingly coming into common use. The development of the material for the negative terminal has led to an improvement in the quality and efficiency of the batteries, whereas a reduction in the cost of the battery by researching new materials for the positive anode has become a research theme by itself. These long life batteries, it is being increasingly realized, can have value added to them by recycling. Research is increasingly being done on recycling the aluminum case and the load casing for the negative diode. This paper aims to introduce the current situation of recycling of lithium ion batteries. 1. Introduction 2. Various types of batteries and the situation of their recycling and the facts regarding recycling. 3. Example of cobalt recycling from waste Lithium ion secondary cell. 3-1) Flow Chart of Lithium ion battery recycling 3-2) Materials that make a lithium ion secondary cell. 3-3) Coarse grinding of Lithium ion secondary cell, and stabilization of current discharge 3-4) Burning 3-5) Grinding 3-6) Magnetic Separation 3-7) Dry sieving 3-8) Dry Classifying 3-9) Content Ratio of recycled cobalt parts 3-10) Summary of the Line used for the recovery of Cobalt from waste Lithium ion battery. 4. Conclusion.

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은 담지한 흑연을 부극 활물질로 이용한 Lithium ion 2차전지의 충방전 특성 (Charge/Discharge Characteristics of Lithium ion Secondary Battery Using Ag-deposited Graphite as Anode Active Material)

  • 김상필;조정수;박정후;윤문수
    • 한국전기전자재료학회논문지
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    • v.11 no.9
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    • pp.727-732
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    • 1998
  • Ag-deposited graphite powder was prepared by a chemical reduction method of metal particles onto graphite powder. X-ray diffraction observation of Ag-deposited graphite powder revealed that silver existed in a metallic state, but not in an oxidized one. From SEM measurement, ultrafine silver particles were highly dispersed on the surface of graphite particles. Cylindrical lithium ion secondary battery was manufactured using Ag-deposited graphite anodes and $LiCoO_2$ cathodes. The cycleability of lithium ion secondary battery using Ag-deposited graphite anodes was superior to that of original graphite powder. The improved cycleability may be due to both the reduction of electric resistance between electrodes and the highly durable Ag-graphite anode.

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리튬이온 이차전지에서의 미세다공성 격리막의 역할 (The Role of Microporous Separator in Lithium Ion Secondary Battery)

  • 이영무;오부근
    • 멤브레인
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    • v.7 no.3
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    • pp.123-130
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    • 1997
  • 휴대용 정보 통신기기의 소형 경량화에 적합한 고용량 전지인 리튬이온 이차전지에 응용되는 미세다공성 고분자 격리막에 관한 특성을 검토하였다. 격리막으로서 요구되어지는 항목은 전지 성능에도 관련되며, 안전에도 관련된 것들 이어서, 전지의 부재로서 상당히 중요한 부분을 차지하고 있다. 철재는 폴리에틸렌(PE) 등과 같은 폴리올레핀 소재를 연신하여 제조한 미세다공성 격리막이 주로 채용되고 있으며, 다양한 shut-down온도에 적용 가능하고, wettability가 향상된 미세다공성 격리막으로서, 불소계 고분자의 적용 및 폴리올레핀계 소재의 표면개질 등에 관한 연구가 지속되고 있다.

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Electrochemical Properties and Structural Analysis of Carbon-Coated Silicon Anode for Lithium Secondary Batteries

  • Kim, Hyung-Sun;Chung, Kyung-Yoon;Cho, Byung-Won
    • 전기화학회지
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    • v.11 no.1
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    • pp.37-41
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    • 2008
  • The effects of carbon-coated silicon anode on the electrochemical properties and structural change were investigated. The carbon-coated silicon powders have been prepared by thermal decomposition under argon/10wt% propylene mixed gas flow at $700^{\circ}C$. The surface and crystal structure of the synthesized materials were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. Lithium cells with electrodes made from the uncoated and the carbon coated silicon anode were assembled and tested. The carbon-coated silicon particles merged together well after the insertion/extraction of lithium ions, and showed a relatively low irreversible capacity compared with the uncoated silicon particle.