VxG Pattern-Based Analysis and Battery Deterioration Diagnosis

This paper presents the results of an analysis using the direct current internal resistance (DCIR) method on a nickel-cobalt-manganese oxide (NCM)-based battery with a nominal capacity of 55.6 Ah. The accelerated degradation test was performed on V0G, V1G, and V2G patterns, representing existing simple power supply, smart charging control, and bi-directional charge/discharge control, respectively. We assumed V0G, V1G, and V2G patterns and conducted charging and discharging experiments according to the set conditions. According to the pattern repetition, changes in the internal resistance of DCIR and AC-impedance were analyzed and battery deterioration was diagnosed. By comparing DCIR and AC-impedance, we confirmed that the changes in internal resistance has a similar trend. In particular, we propose a new DCIR analysis method in the “stop-operation” part rather than the traditional DCIR method. In the case of traditional DCIR method, time is required for the battery to stabilize. However, the newly proposed DCIR analysis method has the advantage of diagnosing the deterioration of the battery during system operation by analyzing the internal resistance without the stabilization time of the battery.

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An Energy Storage System’s Operational Management and Control Method Considering a Battery System

Electronics ◽

10.3390/electronics9020356 ◽

2020 ◽

Vol 9 (2) ◽

pp. 356 ◽

Cited By ~ 1

Author(s):

Jeong Lee ◽

Jun-Mo Kim ◽

Kyung Ryu ◽

Chung-Yuen Won

Keyword(s):

Energy Storage ◽

Control Method ◽

Thermal Characteristics ◽

Internal Resistance ◽

Constant Current ◽

Efficient Operation ◽

Charging Time ◽

Charging Control ◽

Battery Systems ◽

In The Beginning

Losses in energy storage systems (ESSs) result from losses in battery systems and power conversion systems (PCSs). Thus, the power difference between the input and output occurs as a loss, which is considered an operational cost. Additionally, since battery systems consist of modules, there is always a temperature difference. Even if voltage balancing is conducted, deviations between the state of health (SoH) and state of charge (SoC) always exist. Therefore, a battery characteristic should be considered in relation to the efficient operation of an ESS. In this paper, charging control is implemented based on the SoC. When errors occur in the beginning, the coulomb counting method (CCM) continues to produce errors; it also calculates the SoC through an improved equation. Thus, it can calculate the SoC by using high-accuracy initial values. Moreover, battery deterioration occurs during charging and discharging, which increases a battery’s internal resistance. This reduces the switching time to the battery cut-off voltage or constant voltage (CV) mode, so it becomes possible to calculate the SoH. Therefore, in this paper, the algorithms and equations are proposed to perform SoH operations according to the charging time that is able to reach CV after charging. A conventional battery is usually charged by using constant current (CC) charging until the voltage of the battery module reaches the cut-off area. A switch to CV then occurs when the cut-off area is reached and maintained. However, SoC-based selective charging control is carried out to prevent heat problems. In addition, the battery is charged safely and efficiently by conducting SoH prediction considering the battery thermal characteristics, which vary depending on the charging time and other characteristics. In this paper, a 3 kW ESS was produced, and the proposed algorithm’s feasibility was verified.

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Magnetic AC Impedance Analysis Method Using High-Tc SQUID Based Magnetic Measurement System

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2016.2631426 ◽

2017 ◽

Vol 27 (4) ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

Kenji Sakai ◽

Tsubasa Kizu ◽

Toshihiko Kiwa ◽

Keiji Tsukada

Keyword(s):

Measurement System ◽

Magnetic Measurement ◽

Impedance Analysis ◽

Ac Impedance ◽

Analysis Method ◽

High Tc ◽

Ac Impedance Analysis

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A reliability analysis method for LED luminaires based on step stress accelerated degradation test

2013 14th International Conference on Electronic Packaging Technology ◽

10.1109/icept.2013.6756675 ◽

2013 ◽

Cited By ~ 4

Author(s):

M. Cai ◽

D. G. Yang ◽

W. B. Chen ◽

H. L. Jia ◽

K. M. Tian ◽

...

Keyword(s):

Reliability Analysis ◽

Analysis Method ◽

Accelerated Degradation ◽

Degradation Test ◽

Accelerated Degradation Test

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Preparation of polyaniline hollow microspheres/zinc composite and its application in lithium battery

High Performance Polymers ◽

10.1177/0954008318756495 ◽

2018 ◽

Vol 31 (2) ◽

pp. 178-185 ◽

Cited By ~ 2

Author(s):

Zhihua Li ◽

Yuting Shen ◽

Yanbo Li ◽

Feng Zheng ◽

Lanlan Liu ◽

...

Keyword(s):

Self Assembly ◽

High Performance ◽

Lithium Battery ◽

Ac Impedance ◽

Internal Resistance ◽

Hollow Microspheres ◽

Assembly Method ◽

Discharge Efficiency ◽

A Current ◽

Charge Discharge

Polyaniline (PANI) hollow microspheres were synthesized by a self-assembly method in aqueous solution of poly (2-acrylamido-2-methylpropane sulfonic acid) (PAMPS), and then microspheric zinc (Zn) was introduced into PANI to prepare PANI hollow microspheres/Zn composite. The structure and morphology of as-synthesized samples were investigated by Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, and scanning electron microscopy, respectively. The charge/discharge property, cyclic voltammetry, and alternating current (AC) impedance spectroscopy of as-prepared samples were also examined in detail. The results showed that the electrical conductivity of PANI/Zn composite reached 21.2 ± 0.16 S/cm at 20 wt% of Zn, which was 11.4 S/cm higher than that of PANI. The first discharge capacity of PANI/Zn lithium battery reached 570.8 mAh/g at a current density of 0.2 mA/cm2. After 15 cycles, it remained at 159 mAh/g, which was 107 mAh/g higher than that of PANI lithium battery. Furthermore, the results of AC impedance test showed that the addition of Zn powders significantly reduced the internal resistance of battery. Compared with PANI, PANI/Zn composite showed greater capacity, higher conductivity, and charge/discharge efficiency, which was more suitable for the cathode material of high performance lithium battery.

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Online Measurement of Battery Internal Resistance Based on AC Impedance Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.718-720.773 ◽

2013 ◽

Vol 718-720 ◽

pp. 773-778 ◽

Cited By ~ 2

Author(s):

Ming Yu Gao ◽

San Xing Chen ◽

Li Lin Cheng ◽

Ming Liang Yi

Keyword(s):

Lithium Ion Battery ◽

Lithium Ion ◽

Ac Impedance ◽

Internal Resistance ◽

Measurement Methods ◽

Impedance Method ◽

Feedback Signal ◽

Online Measurement ◽

Small Resistance ◽

The Stability

In this paper, the merit and disadvantage of existing measurement methods for battery internal resistance are firstly analyzed. Then an online internal resistance measurement based on AC impedance method is proposed, which can increase the stability of the excitation source and enhance the performance of the filtered feedback signal. The method can be used to measure the small resistance of lithium-ion battery precisely. Experimental results show that the proposed method is accurate.

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