Equivalent Circuit Modeling of All-Solid-State Battery by using DC-IR Data

Celen, Burak; Aras, Ayse Cisel; Dohr, Markus; Sivaraman, Thyagesh

doi:10.1109/syscon48628.2021.9447086

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…When discharging in a state where the SOC is 50% or less, a cell with a large battery capacity will see a relatively small voltage drop for the same discharging current as the others; hence, the voltage will be relatively high. A similar phenomenon occurs in the constant-current (CC) section because the DCIR is different due to the difference in SOC [23,24]. While charging, the cell balancing works, but the balancing current is too low for the charging current to function.…”

Section: Charging/discharging Characteristics Of Series-connected Bat...mentioning

confidence: 86%

“…As the capacity deviation among batteries connected in series increases, the lifespan of a battery with a relatively small capacity is decreased, and the lifespan of a battery with a relatively large capacity is increased. A battery with a small capacity has a relatively large usable area, discharges until SOC 0%, and has a relatively high DCIR [8,[23][24][25][26][27]. Cells with relatively large capacities cannot lower their SOC until 0%; thus, they have a relatively high voltage, and, due to the low DCIR, the voltage rise during stabilization is relatively small.…”

Section: Characteristics Of Series-connected Batteriesmentioning

confidence: 99%

“…Therefore, it can be seen that there is no significant difference when only simple voltage is compared during rest time. Conversely, when the SOC is charged to 100%, the SOC cannot reach 100% because there is not enough current to fully charge a cell with a large battery capacity [10][11][12]18,23,24]. Therefore, a cell with a small capacity is charged with a voltage higher than the set voltage due to the voltage distribution, and a cell with a relatively large capacity is charged with a lower voltage [7,19].…”

Section: Characteristics Of Series-connected Batteriesmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Capacity Variation in Series-Connected Batteries on Aging

Yun

Kee

2022

Batteries

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Batteries are used in various combinations in various fields. Research on single-cell batteries is well underway and is approaching a stabilization phase. However, problems caused by battery combinations are still insufficiently studied. The purpose of this study was to investigate the cause of fires due to gradual damage in a large-capacity energy storage system (ESS). In the paper Energy Storage System Safety Operation Plan by Preventing Overcharge During Relaxation Time, which was based on the fact that most fires in large-capacity energy storage devices occurred during the diastolic period, it was proven that the inflow of compensation current due to a voltage imbalance in the cell was the cause. The total amount of compensation current is determined by the voltage deviation of the battery. Batteries connected in series have different rates of aging due to differences in their capacities. Thus, with use, the total amount of compensating current continues to increase until a fire occurs. In this study, by analyzing the effect of battery-capacity deviation on the aging of individual cells, it was confirmed that the capacity deviation increased as the battery was used, resulting in an increase in the total amount of compensation current. In addition, if a solution to the problem is presented and the proposed solution is applied, the allowable range of battery-capacity deviation will be widened. We used Matlab 2009a, assuming a real environment. Using Simulink, problems were identified through simulation, improvement measures were suggested, and the proposed method was verified via simulation.

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Section: Charging/discharging Characteristics Of Series-connected Bat...mentioning

confidence: 86%

Section: Characteristics Of Series-connected Batteriesmentioning

confidence: 99%

Section: Characteristics Of Series-connected Batteriesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Capacity Variation in Series-Connected Batteries on Aging

Yun

Kee

2022

Batteries

View full text Add to dashboard Cite

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“…The case of discharge is similar [15][16][17][18][19][20][21][22]. Different SOCs have different Direct Current Internal Resistances (DCIRs) [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. This causes a large potential difference between each battery.…”

Section: Series Connection Of Batteriesmentioning

confidence: 99%

Voltage Reference Realignment Cell Balance to Solve Overvoltage Caused by Gradual Damage of Series-Connected Batteries

Yun

Kee

2023

Applied Sciences

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This paper analyzes the cause of electric vehicle battery fires. The fundamental cause is attributed to a low cell balance current, and it is proven that the variation in the battery’s internal voltage due to temperature change is the decisive reason for battery fires. In this paper, the authors studied a method of solving the problem by changing only the software of the existing Battery Management System (BMS) without changing the hardware. Batteries cannot be made with 100% capacity, resulting in voltage division. Cell balancing is performed to prevent such phenomena, but a low cell balance current prevents the proper operation of cell balancing. As a result, relatively small batteries, due to progressive degradation, have continuous voltage rise toward overvoltage. Subsequently, an additional voltage rise occurs as the chemical activity of the battery increases due to temperature rise. In this paper, a new cell balancing method is proposed to limit the aging process of cells with a relatively small capacity and peak voltage. In addition, it was validated through simulation using MATLAB R2019a.

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Efficient Method of Identifying a Li-Ion Battery Model for an Electric Vehicle

Marušić

Vašak

2022

2022 IEEE 20th International Power Electronics and Motion Control Conference (PEMC)

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Equivalent Circuit Modeling of All-Solid-State Battery by using DC-IR Data

Cited by 3 publications

References 18 publications

Effect of Capacity Variation in Series-Connected Batteries on Aging

Effect of Capacity Variation in Series-Connected Batteries on Aging

Voltage Reference Realignment Cell Balance to Solve Overvoltage Caused by Gradual Damage of Series-Connected Batteries

Efficient Method of Identifying a Li-Ion Battery Model for an Electric Vehicle

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