• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2187-2189
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• 2001

The proposed algorithm has produced the rules of relationship between the load voltage, current, discharging electric power and ampere-hours, electric power capacity of battery on the basis of the data. Which were acquired through the battery discharging experiment that is defined by the battery's ambient temperature and various load conditions. Especially, by calculating the parameter of second order polynomial equation relation between the remaining capacity and the electric power, the algorithm is proposed adapting for the discharging pattern. And as the depth of discharging is increasing, the calculation-method of electric power is applied to decrease the accumulated error in the calculation method of capacity accumulation. Also, the proposed algorithm has compensated the temperature considering the capacity change of battery to the temperature.

• 플랜트 저널
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• 제16권4호
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• pp.40-44
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• 2020

본 연구에서는 2 V 연축전지의 극판에 펄스파를 인가하여 충전과 방전을 반복한 후 충전용량을 분석하였다. 발전소에서 비상용 전원으로 많이 사용하고 있는 연축전지는 충전과 방전이 반복됨에 따라 방전시 극판에 달라붙어 있던 황산염이 충전 시 이탈하지 아니하고 극판에 피막형태로 달라붙어 절연막을 형성하여 연축전지의 전기반응 통로를 차단하기 때문에 충전용량이 줄어들게 된다. 이에 12 V 연축전지에 많이 사용하고 있는 펄스파를 2 V 연축전지 극판에 인가하고 충전용량을 분석하였다. 펄스파로는 4 V, 20 mA의 전압과 전류에 각각 10 kHz, 20 kHz, 30 kHz 주파수의 펄스파를 사용하였다. 실험결과를 분석한 결과 펄스파를 인가하지 않은 연축전지는 초기 충전용량보다 약 18 % 충전용량이 감소한 반면, 펄스파를 인가한 연축전지는 충전용량의 감소가 훨씬 적었고, 특히 20 kHz 주파수의 펄스파에서 충전용량이 0.56 %만 감소되었다. 이것은 20 kHz 주파수의 펄스파가 다른 주파수의 펄스파보다 극판의 황산염 피막을 분해하는데 더 적합하여 양전하와 음전하의 이동이 활발해진 것으로 판단된다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.82-86
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• 2004

In this paper, a cycler system for the Lithium-Polymer battery with the large capacity of 120Ah is presented. This system is constituted as the two units for the charging and discharging. The Lithium-Polymer battery should be charged in CC and CV mode, and it is required a very high precision control of the voltage and current for the charging unit. To decrease the switching noises and harmonics, parallel operation method is adopted and utilized in the power conversion module. The discharging unit has a link AC system function to return the discharging energy of battery to AC line and has comparatively less thermal loss. These units are designed to be controlled and monitored by personal computer. The total system for the battery charging and discharging is described and presented.

• International Journal of Advanced Culture Technology
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• 제10권3호
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• pp.281-286
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• 2022

In this study, design of an intuitive internal resistance diagnostic device is to diagnose the residual capacity and aging of the battery regardless of the model and the internal protocol of the waste battery through the method of measuring the internal resistance of a waste battery. In this paper, charging and discharging were continuously performed with 2A charging and 5A discharging in order to secure data on impedance changes that may occur in the charging and discharging process of various methods. As a result of the final experiment, it was confirmed that the impedance change occurred during charging and discharging, and the amount of change increased as the charging/discharging C-rate increased. In addition, it was confirmed that the waste battery aged or abnormal cell had a large change in the impedance value.

• Journal of Power Electronics
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• 제12권1호
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• pp.1-9
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• 2012

This study investigates an application of the Hamming network-dual extended Kalman filter (DEKF) based on pattern recognition for high accuracy state-of-charge (SOC)/capacity estimation and state-of-health (SOH) prediction at various temperatures. The averaged nine discharging/charging voltage-temperature (DCVT) patterns for ten fresh Li-Ion cells at experimental temperatures are measured as representative patterns, together with cell model parameters. Through statistical analysis, the Hamming network is applied to identify the representative pattern that matches most closely with the pattern of an arbitrary cell measured at any temperature. Based on temperature-checking process, model parameters for a representative DCVT pattern can then be applied to estimate SOC/capacity and to predict SOH of an arbitrary cell using the DEKF. This avoids the need for repeated parameter measuremet.

• 한국정밀공학회지
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• 제33권12호
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• pp.965-970
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• 2016

Fuel used in the steel metallurgy industry is stored in huge stage systems called SILO. Fuel is released by RDM (Rotary Discharge Machine), at the place of utilization. RDM is located in the Silo, and is constituted of a main frame, driving part, discharging part and control part. RDM is combined to a direct motion on the rail in tunnel, having a rotary motion enabled by a motor. In this paper, we calculate the theoretical discharging capacity of RDM to confirm the correlation between design element and discharging capacity of RDM. Also, through structure analysis, we confirm the vulnerable point of RDM when it discharges the storage materials. We hope to apply these results to design a more efficient RDM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 B
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• pp.570-572
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• 1999

An equivalent circuit model of vehicle charging-discharging system for simulation is developed. The vehicle electric power system consists of alternator and battery. The alternator must have adequate capacity for providing electric energy to all loads, and the battery supports the alternator by offering insufficient energy when the alternator output energy is not enough. The alternator model is simplified for the use of characteristic curve, which was provided by its manufacturer, and the battery model is separated in charging mode and discharging mode because of its complex characteristics. Developed circuit model is validated by comparing the simulation data and real experimental data.

• 한국산업융합학회 논문집
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• 제24권6_1호
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• pp.669-681
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• 2021

As the supply of xEV in Korea is rapidly increasing, the amount of waste batteries is expected to increase rapidly, but the current recycling system for waste xEV batteries is very insufficient. In order to properly utilize the xEV reusable battery module, it is essential to classify it into a type that has similar discharge characteristics to the current state of health(SOH), which is the discharge capacity of the battery. This paper proposes a system that can minimize the exchange of energy with the KEPCO system by using the charging/discharging method by circulating power between batteries in order to minimize the power consumption when charging and discharging waste batteries. In the proposed system, a function to measure parameters during the charging/discharging test of the waste battery was implemented to build a customized big date for the test waste battery. In addition, the dynamic characteristics of the proposed circuit were analyzed using PSIM, which is useful for power electronics analysis, and the validity of the proposed circuit was verified through experiments.

• 한국신뢰성학회지:신뢰성응용연구
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• 제17권1호
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• pp.66-71
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• 2017

Purpose: Polymer capacitors are known to have very high reliability as compared with liquid electrolytic capacitors, but their capacity has been reported to decrease in charge and discharge at low temperature. The purpose of this study to clarify these characteristics. Methods: In order to clarify these characteristics, charging-discharging tests were carried out for 200 hours with three different capacities and at 5 different temperature from $5^{\circ}C$ to $100^{\circ}C$. Results: As a result of the test, it was confirmed that the capacity of the polymer capacitor was decreased with higher capacity and lower temperature. Conclusion: Such a failure phenomenon was caused by the shrinkage and expansion characteristics of the polymer used therein, it is presumed that this failure phenomenon is due to the complex pore structure made by etching.

• 한국화재소방학회논문지
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• 제33권6호
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• pp.173-180
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• 2019

유류탱크 화재는 화재진압이 쉽지 않다. 미국, 일본, 싱가포르 등의 국가에서는 오랜 시행착오 끝에 대형 유류저장탱크의 전면화재에 대응하기 위한 대용량의 포방사 시스템을 도입하였다. 본 연구에서는 American Petroleum Institute (API), National Fire Protection Association (NFPA), British Standard European Norm (BS EN)의 관련 기준과 일본의 법령 등을 바탕으로 대용량 포방사에 대한 기준과 방법 등을 연구하였고, 모형탱크 전면화재 진압 비교실험을 통해 대용량 포방사의 성능을 확인하였다. 그 결과 소용량의 노즐 여러 개를 사용하는 것보다 대용량의 노즐 하나를 사용하는 대용량 포방사가 화재진압 성능이 더 우수 하였고, 노즐의 배치를 달리하여 서로 다른 방향에서 방사하는 것보다 동일한 방향에서 집중 방사하는 것이 더욱 효과적이었다. 결국 대용량포방사시스템의 국내도입 필요성을 확인하였다. 그러나 대용량포방사시스템의 운용은 현장 여건에 따라서는 매우 제한적일 수밖에 없다. 따라서 시스템을 최대한 경량화 되고 이동이 쉬운 것으로 도입하여야 한다. 또한 주요 탱크별로 운영계획을 수립하면서 대구경 소방호스의 장거리 설치문제, 소방활동 공간의 협소문제 등 파악되는 장애요인을 현장 여건에 따라 해결해 나가는 것이 현실적 방안으로 보인다.