• Title/Summary/Keyword: Battery Optimal Design

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Photovoltaic System Operation Optimal Technique Considering Climate Condition and Residential Loads Pattern (기후조건 및 실부하패턴을 고려한 태양광 시스템 최적 운전기법)

  • Moon, Hee-Sung;Choe, Gyu-Yeong;Kim, Jong-Soo;Lee, Yeong-Guk;Lee, Byoung-Kuk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2385-2390
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    • 2009
  • Based on the detailed analysis of output characteristics of PV array and residential load usage pattern, a design method to calculate optimal battery capacity for stand-alone PV generation systems is proposed. And also, according to power flow Actual irradiation and temperature data are analyzed to compose a PV array simulator and also six representative home appliances are electrically modeled for load simulator, along with 24hours usage pattern. The surplus and insufficient power can be calculated from the proposed simulation platform, so that selection of an optimal battery capacity can be possible. The theoretical analysis and design process will be explained, along with informative simulation results.

Optimal Design of Battery of Fuel Cell Electric Vehicle Based on Fuel Cell Dynamic Characteristic Model (연료전지 과도 특성 모델링 기반 FCEV용 배터리 용량 최적 설계)

  • Ko, Jeong-Min;Kim, Jong-Soo;Lee, Young-Kuk;Lee, Byung-Kuk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.9
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    • pp.1714-1719
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    • 2009
  • In this paper, methodology of battery optimal designing is proposed. Fuel cell model including dynamic characteristic is developed and load model is produced by considering driving schedule. Using these models, required energy of load and supplying energy from fuel cell are analyzed by comparing simulation results. Also parameter of fuel cell model is changed variously and battery capacity is calculated in each cases. And methode of battery optimal designing is presented by regarding dynamic characteristic of fuel cell.

Optimal Design of Guide Vane for Improvement of Heat Removal Performance of Electric Vehicles Battery Using Genetic Algorithm (유전 알고리즘을 활용한 전기 자동차 배터리 방열성능 향상을 위한 가이드 베인 최적설계)

  • Song, Ji-Hun;Kim, Youn-Jea
    • Journal of Auto-vehicle Safety Association
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    • v.14 no.1
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    • pp.55-61
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    • 2022
  • Along with global environmental issues, the size of the electric vehicle market has recently skyrocketed. Various efforts have been made to extend mileage, one of the biggest problems of the electric vehicles, and development of batteries with high energy densities has led to exponential growth in mileage and performance. However, proper thermal management is essential because these high-performance batteries are affected by continuous heat generation and can cause fires due to thermal runaway phenomena. Therefore, thermal management of the battery is studied through the optimal design of the guide vanes, while utilizing the existing battery casing to ensure the safety of the electric vehicles. A battery from T-company, one of a manufacturer of the electric vehicles, was used for the research, and the commercial CFD software, ANSYS CFX V20.2, was used for analysis. The guide vanes were derived through optimal design based on a genetic algorithm with flow analysis. The optimized guide vanes show improved heat removal performance.

Design of Three-winding Coupled Inductor for Minimum Current Ripple in Battery Chargers

  • Kang, Taewon;Suh, Yongsug
    • Proceedings of the KIPE Conference
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    • 2015.07a
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    • pp.195-196
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    • 2015
  • This paper investigates the design of coupled inductor for minimum inductor current ripple in rapid traction battery charger systems. Based on the general circuit model of coupled inductor together with the operating principles of dc-dc converter, the relationship between the ripple size of inductor current and the coupling factor is derived under the different duty ratio. The optimal coupling factor which corresponds to a minimum inductor ripple current becomes -0.5, i.e. a complete inverse coupling without leakage inductance, as the steady-state duty ratio operating point approaches 1/3 or 2/3. In an opposite manner, the optimal coupling factor value of zero, i.e. zero mutual inductance, is required when the steady-state duty ratio operating point approaches either zero or one. Coupled inductors having optimal coupling factor can minimize the ripple current of inductor and battery current resulting in a reliable and efficient operation of battery chargers.

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Process Optimization for Improving Resistance Welding Quality of Cylindrical Secondary Battery (원통형 이차전지의 저항용접 품질 향상을 위한 공정 최적화)

  • Chung, Ji Sun;Park, Soon Seo;Kim, Jee Ho;Kwon, Hyuck Moo;Hong, Sung Hoon;Lee, Min Koo
    • Journal of Korean Society for Quality Management
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    • v.48 no.1
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    • pp.69-86
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    • 2020
  • Purpose: This study aims to determine the optimal conditions for the spot welding process that mechanically connects the case of a cylindrical secondary battery and the negative tab. Methods: We use 33 factorial design to derive the optimal conditions for the spot welding process. The pulling strength, the cross-sectional area of nugget, and the shock test life are selected as response variables, which can represent the resistance welding quality. The input variables are selected as the welding time, welding voltage, and pressure, which are the controllable factors in the spot welding process. Results: The main effects of welding time and welding voltage and the interaction effect of welding time and welding voltage are significant. Conclusion: The optimal conditions for the spot welding process to mechanically join the negative electrode tab of the cylindrical secondary battery and the battery case are developed. The result shows that the pulling strength is increased by 44% compared to before improvement under optimal conditions.

Design of Optimal Resonant Frequency for Series-Loaded Resonant DC-DC Converter in EVs On-Board Battery Charger Application (전기자동차 탑재형 충전기용 부하직렬공진형 컨버터의 최적 공진주파수 설계)

  • Oh, Chang-Yeol;Kim, Jong-Soo;Lee, Byoung-Kuk
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.1
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    • pp.77-84
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    • 2012
  • This paper describes the process of optimal resonant frequency design with full-bridge series-loaded resonant dc-dc converter in a high efficiency 3.3 kW on-board battery charger application for Electric Vehicles and Plug-in Hybrid Electric Vehicles. The optimal range of resonant frequency and switching frequency used for ZVS are determined by considering trade-off between loss of switching devices and resonant network with size of passive/magnetic devices. In addition, it is defined charging region of battery, the load of on-board charger, as the area of load by deliberating the characteristic of resonant. It is verified the designed frequency band by reflecting the defined area on resonant frequency.

Optimal Design for Dynamic Resistance Equalization Technique to Minimize Power Loss and Equalization Error

  • La, Phuong-Ha;Choi, Sung-Jin
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.50-52
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    • 2019
  • Dynamic resistance equalization is a viable technique to balance SOC of cells in a parallel-connected battery configuration due to high equalization performance, simplicity and low-cost. However, an inappropriate design of the equalization resistor can degrade the equalization performance and increase the power loss. This paper proposes an optimization process to design the equalization resistors to minimize power loss and equalization error. The simulation results show that the optimally designed resistor significantly enhance the performance in comparison with the conventional fixed-resistor equalization.

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A Study on the Magnetic Field Analysis and Optimal Core Design of DC Current Sensor for Vehicles (자동차용 DC Current Sensor의 자장해석 및 코어 최적형상 설계에 관한 연구)

  • Lee, Hee-Sung;Park, Jong-Min;Kim, Choon-Sik;Kim, Sung-Gaun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.5
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    • pp.74-83
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    • 2009
  • Recently, usage of electric and electronic system for car increases rapidly. Consequently power monitoring supplied to the system is essential for management and controlling. Generally, battery status is monitored through measuring and diagnosing the current measurement method utilizing Hall Effect. Therefore, in this paper, we analysed magnetic field to develop the solution of DC current sensor using Hall Effect which is the core of design and development. By analysing the magnetic field by FEM using Maxwell 3D software, the location of the highest output current and stable part in the Hall IC sensor was shown. Also, the optimal core design of DC current sensor using parametric and Simplex method was presented. A car battery charge and discharge process dependant on time effect on the changing of magnetic field was simulated and compared to the result from the experiment result of actual vehicle.

Optimal Battery Pack Design Tool for the Delivery UAV (배송용 무인항공기를 위한 최적 배터리팩 설계 툴)

  • Jung, Sunghun;Jeong, Heon
    • Journal of the Korea Convergence Society
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    • v.8 no.6
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    • pp.219-226
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    • 2017
  • As the UAV industry is getting matured, various types of UAVs have appeared in many application fields, including filming, reconnaissance, rescue, and etc. and it requires the quick hardware designs, particularly a battery pack, of the UAV. We developed the automatic battery pack design tool for the convenient battery pack configuration design of the hoverable type delivery UAV. With inputs, including current profile, voltage profile, various kinds of cell specifications, desired battery pack voltage, and etc. the automatic battery pack design tool calculates a pack having the minimum weight and the maximum capacity by combining either homogeneous cells or heterogeneous cells. Also, the tool could predict the capacity fading trend of the designed battery pack configuration.

Two-Stage Charge Equalization Scheme for Hybrid Electric Vehicle Lithium-Ion Battery Cells

  • Park, Hong-Sun;Kim, Chong-Eun;Moon, Gun-Woo;Lee, Joong-hui
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.241-243
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    • 2007
  • Two-stage charge equalization scheme for HEV lithium-ion battery string is proposed with the optimal power rating design rule in this paper, where in the first stage the over charged energy of higher voltage cells is drawn out to the single common output capacitor and then, that discharged energy is recovered into the overall battery stack in the second stage. To achieve charge equalization of sort, the conventional flyback DC/DC converters of low power and minimized size are employed. The industrial sample employing both the proposed two-stage cell balancing scheme and the optimal power rating design rule shows good cell balancing performance with reduced size as well as low voltage stresses of the electronic devices.

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