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Licensed Unlicensed Requires Authentication Published by De Gruyter March 20, 2018

Estimation of Battery Soc for Hybrid Electric Vehicle using Coulomb Counting Method

Bachir Zine EMAIL logo , Khoudir Marouani , Mohamed Becherif and Said Yahmedi


The autonomy of the Battery Electric Vehicle is a key point in the development and commercialization of this kind of vehicle. The requested autonomy is directly linked to the amount of the stored and remaining energy in the battery which is the State of Charge (SOC).This paper presents battery state of charge (SOC) estimation using coulomb counting method. So, the quantity of electric charge is calculated during the battery cycle of charge and discharge and compared to the estimated value based on the battery generic model. Also, experimental results are carried out in order to validate this study.


The list of abbreviations and symbols is provided in Table 4.

Table 4:

List of abbreviations and symbols.

SOCState of Charge
AhAmpere hour
OCVOpen Circuit Voltage
ACAlternatif Current
SVMSupport Vector Machine
SOHState of Health
HEVHybrid Electric Vehicle
CCConstant Current
CVConstant Voltage
I(τ)The current versus time (negative during charge and positive during discharge)
VbattThe battery voltage (V)
E0The constant battery voltage (V)
KThe polarization constant (V/(Ah)) or polarization resistance (Ω)
QThe battery capacity (Ah)
it= ∫Idt: Actual battery charge (Ah)
AThe exponential voltage (V)
BThe exponential capacity (Ah) -1
RThe internal resistance (Ω)
IThe battery current (A)
i*The filtered current (A)
TAmbiant temperature
IdisThe value of the current of discharge
SOC0Initial State of Charge
SOCminMinimum State of Charge
SOCexpExperimental State of Charge
SOCthTheoretical State of Charge
VchintInitial charge voltage
VchendEnd charge voltage
TchsumSimulation charge time
VdisintInitial discharge voltage
VdisendEnd discharge voltage
TdissumSimulation discharge time


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Received: 2017-8-30
Revised: 2018-1-22
Accepted: 2018-1-28
Published Online: 2018-3-20

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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