Electrical battery modeling for applications in wireless sensor networks and internet of things

Bulletin of Electrical Engineering and Informatics
Vol. 10, No. 4, August 2021, pp. 1793~1802
ISSN: 2302-9285, DOI: 10.11591/eei.v10i4.3106 1793
Journal homepage: http://beei.org
Electrical battery modeling for applications in wireless sensor
networks and internet of things
Fahad Rasool, Micheal Drieberg, Nasreen Badruddin, Patrick Sebastian, Christopher Teh Jun Qian
Department of Electrical and Electronic Engineering, Universiti Teknologi PETRONAS, Malaysia
Article Info ABSTRACT
Article history:
Received Nov 22, 2020
Revised Mar 25, 2021
Accepted Jun 11, 2021
Modeling the behavior of the battery is non-trivial. Nevertheless, an accurate
battery model is required in the design and testing of systems such wireless
sensor network (WSN) and internet of things (IoT). This paper presents the
one resistive-capacitance (1RC) battery model with simple parameterization
technique for nickel metal hydride (NiMH). This model offers a good trade-
off between accuracy and parameterization effort. The model’s parameters are
extracted through the pulse measurement technique and implemented in a
physical and dynamic simulator. Finally, the performance of the model is
validated with the real-life NiMH battery by applying current pulses and real
wireless sensor node current profiles. The results of the voltage response
obtained from both the model and experiments showed excellent accuracy,
with difference of less than 2%.
Keywords:
Battery
Internet of things
Modeling
Wireless sensor networks
This is an open access article under the CC BY-SA license.
Corresponding Author:
Christopher Teh Jun Qian
Department of Electrical and Electronic Engineering
University Teknologi PETRONAS
32610, Seri Iskandar, Perak, Malaysia
Email: christopher_19000229@utp.edu.my
1. INTRODUCTION
Batteries are used in almost every part of our lives. Increasingly, it is finding its utility in new
application areas such as hybrid electric cars, personal mobile devices, micro energy harvesting system and
so on. There are extensive research efforts in many areas of the battery technology [1]-[5]. One of the
important area is in the modeling of the battery because this allows researchers, designers and engineers to
evaluate various design choices in a timely and cost effective manner. However, most of the work has been
focused on Li-ion batteries due to their application in hybrid electric cars [6]-[11]. On the other hand, in the
rapidly emerging areas of wireless sensor network (WSN) and internet of things (IoT), there has been less
attention for the smaller capacity nickel metal hydride (NiMH) batteries. Therefore, this work endeavours to
address this gap by developing a simple but accurate NiMH battery model.
WSN and IoT are experiencing an explosive growth due to their wide applicability across many
industries. In order to enable the continuous and perpetual operation of WSN and IoT, micro energy
harvesting system has emerged as a promising solution. A micro energy harvesting system consists of energy
harvesting, energy storage and power management subsystems. The energy storage subsystem usually
comprises a battery as a store of energy as renewable energy source. Since this energy source supplies in a
non-constant manner, the system operation can be disrupted. Therefore, the battery is a key component in the
micro energy harvesting system.
The ability of a battery model in simulating its behaviour under various conditions not only reduces
time but also cost when compared to building a hardware prototype. Various tests can be performed and their
results obtained in a timely manner [12]. In the literature, a large variety of models have been proposed,

 ISSN: 2302-9285
Bulletin of Electr Eng & Inf, Vol. 10, No. 4, August 2021 : 1793 – 1802
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which include electrical, electrochemical, analytical, and stochastic models. Among them, the electrical
models are preferred due to its good trade-off between accuracy and simpler parameterization effort.
Furthermore, these models also take into account both the complexity and non-linearity of the battery [13]. In
contrast, electrochemical models require the solving of partial differential equations, which is much more
complex. Therefore, the electrical models offer good usability and accuracy [14].
The electrical battery model comprises of an equivalent circuit with voltage source, resistance and
capacitance. Its variants include one resistive (1R), one resistive-capacitance model (1RC) and two resistive-
capacitance (2RC) models. The 1R model is represented by only series resistance with a voltage source. On
the other hand, 1RC and 2RC have an additional single RC branch and double RC branch, respectively.
Among them, the 1RC offers the best trade-off between accuracy and parameterization effort [15].
The accuracy of the model is highly dependent of the parameterization, which is basically to
determine the values of the resistors and capacitors that should be used in the corresponding model. Two
main techniques used for parameterization are the pulse measurement and optimization. A rectangular current
pulse is applied to obtain the voltage response of the battery in both techniques. For the optimization
technique, the values of resistance and capacitance are optimized by matching the produced voltage response
against the measured voltage response. This process has a higher complexity and involves significant efforts.
In the pulse measurement technique, the values of the resistance and capacitance are obtained through
mathematical equations from the measurement of the voltage response [16], which is much simpler. Among
the pulse measurement based parameter extraction techniques, one of the best was proposed Einhorn et al. in
[15]. It consists of simple equations that can be applied with the pulse measurement procedures. The
parameter extraction technique has been applied and tested on Li-ion battery, with very high accuracy.
However, it has not been applied on the NiMH battery.
Although limited, there are several recent works in NiMH battery modeling. Cruz-Manzo et al. and
Zhu et al. in [17], [18], electrochemical models were proposed with the objectives of obtaining new
understanding in the interpretation of battery electrochemical mechanisms and to study the battery capacity
degradation effects. These models are complicated and its integration with other electronic components’
models is also not straightforward. An investigation into the tradeoff between accuracy and simplicity was
undertaken in Fotouhi et al. [19] based on the electrical model and optimization-based parameterization. The
study yielded very accurate results in terms of state of charge (SoC) and state of health (SoH). Meng et al. in
[20], an accurate SoC estimator for design of battery management system (BMS) was proposed for battery
lifetime extension. It worked very well in the specific application of electric boats that were to be used for
scenic tours in caves. A enhancement to an existing analytical based battery model by taking into account the
temperature effect was undertaken Rodrigues et al. in [21]. It provided an accurate estimation of the battery
lifetime at different temperatures. However, in these works, the detailed voltage response results were not
provided.
Therefore, this paper will present the 1RC NiMH battery model with the simple parameterization
technique. This is followed by its implementation in a physical and dynamic simulator. Experiments with
NiMH batteries using both current pulses and real wireless sensor node current profiles will be performed to
test and validate the model's accuracy. The percentage difference between the model and experiment is less
than 2%. The proposed parameterization technique shows a high accuracy with NiMH battery compared to
the previous works, which only tested with Li-ion batteries. Following is the organization of the paper. The
methodology for 1RC battery model parameterization is presented in section 2. The results are shown and
discussed in section 3, while section 4 concludes the paper.
2. METHODOLOGY
2.1. 1RC electrical battery model
The battery modeling along with its parameter extraction technique is presented. The model is
relatively simple and requires minimum parameters from the datasheet. 1RC electrical battery model consists
of a voltage source V, series resistance Rs and a parallel RC branch connected in series is shown in Figure 1.
The model is capable of predicting the battery performance and SoC estimation better than the typical
analytical and electrochemical battery models. The model components are:
− V is the voltage source and it represents the open circuit voltage (OCV) of the battery
− Rs is the series resistance of electrolyte.
− Rp, Cp is the RC network and represents the transient response of the battery electrodes.
Parameterization is to extract the values of model parameters such as Rs, Rp and Cp. The 1RC battery
model is dynamic in nature and the parameter values are varying with the change in SoC. Therefore, the
important part is to get the correct parameters of the model when they are varying with SoC. The 1RC
electrical battery model parameters are:

Bulletin of Electr Eng & Inf ISSN: 2302-9285 
Electrical battery modeling for applications in wireless sensor networks and internet of … (Fahad Rasool)
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− CN, the nominal capacity of a battery.
− Rs, the series resistance of electrolyte at SoC=0.
− Rp, the resistance of electrodes at SoC=0.
− Cp, the capacitance of electrodes at SoC=0.
Figure 1. 1RC battery model
The SoC can be obtained by integrating the current over time. The SoC varies between 0 and 1. The
SoC vs OCV curve provides the change in SoC of the battery with voltage. It is determined when there is no
load attached to the battery and is shown in Figure 2. To extract the parameters of 1RC battery model, an
experiment procedure to obtain the pulse measurement is required. Firstly, the battery is fully discharged to
0% SoC followed by a rest period. The rest period is to ensure the accurate measurement of the OCV after
obtaining the thermodynamic stability [22]. After the rest period, a current pulse is applied for a certain
duration to obtain the voltage response of the battery. The cycle of charging and resting period is repeated
until the SoC reaches 100%. This whole procedure will provide the SoC vs OCV curve. Alternatively, this
procedure can also be performed on a fully charged battery by applying discharging current pulses with the
following rest periods. Hence, after obtaining the SoC vs OCV curve, the parameters can be extracted using
the equations provided Hentunen et al. in [23].
Figure 2. SoC vs. OCV curve of NiMH battery
2.2. Parameterization of the 1RC electrical battery model
The manufacturer provides the nominal capacity, CN, of the battery in the datasheet. The values of
Rs, Rp and Cp are obtained by applying a current pulse and measuring the voltage response. The
parameterization technique is following the approach of [15]. The state of charge of the battery is represented
in (1):
𝑆𝑂𝐶 =
𝐶𝑁−𝑄
𝐶𝑁
(1)
where, Q is the charge of the battery at time to given as shown in:
0 10 20 30 40 50 60 70 80 90 100
1.1
1.15
1.2
1.25
1.3
1.35
1.4
1.45
1.5
SOC (%)
OCV
(V)

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𝑄 = ∫ 𝐼𝐵(𝑡)𝑑𝑡
𝑡_0
0
(2)
The series resistance of the electrolyte can be approximated with (3):
𝑅𝑠 =
𝑉𝑖
𝐼
(3)
where, I is the height of the pulse current and Vi is the initial voltage response. While resistance of electrodes
are shown in (4):
𝑅𝑝 =
𝑉𝑓
𝐼
− 𝑅𝑠 (4)
where, Vf is the final voltage response. Both Vi and Vf are shown in Figure 3. The curve is obtained by
applying a rectangular current pulse of 1.5A to the battery.
Figure 3. Battery voltage response
The step current of the pulse measurement technique includes a series of charge or discharge cycles
followed by the rest period. The width of the pulse is normally from 1 minute to 5 minute. In this paper, the
1-minute pulse width is chosen to capture any abrupt change in the behaviour of the battery. A 1500 mAh
NiMH battery is chosen to perform the tests. The step current of the pulse measurement technique is applied
to the battery and the voltage response is obtained. The battery is initially discharged to 0% SoC and then
subject to partial charge phase cycles until the SoC reaches 100%. After every charge cycle, a rest is given to
the battery to stabilize the voltage. Therefore, at the end of one-hour cycle of rest period, the battery voltage
is found stable to be considered a good estimate of the OCV. The SoC is determined based on the current
gained or drawn from the battery at each cycle. This technique is also called coulomb counting. The
capacitance of electrodes can be approximated as (5):
𝐶𝑝 = 𝜏
𝑅𝑠+𝑅𝑝
𝑅𝑠𝑅𝑝
(5)
where, τ is the time constant of the exponential curve and is determined by (6):
𝜏 = 𝑄(1 − 1/𝑒) (6)
where e is the Euler’s number=2.71828. After obtaining the SoC vs. OCV curve by applying the step current
of the pulse measurement technique, the parameters are extracted using (3)-(5).
2.3. Implementation of 1RC electrical battery model
The one diode PV panel model can be implemented through simple MATLAB equations. However,
since the battery is dynamic, its model implementation requires both physical and dynamic simulators such as
Simscape and Simulink. The model utilizes Simscape to build custom circuit elements such as source,
resistor and capacitor which are dependent on SoC [24].
0 100 200 300 400 500 600 700 800
1.25
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
t (s)
V
B
(V)
Vf
Vi

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The 1RC NiMH equivalent circuit model system architecture is shown in Figure 4. The major
building blocks are the signal builder, 1RC equivalent circuit model, ideal temperature source, convective
heat transfer, voltage sensor, and the scope. The signal builder provides the pulse charging current. The ideal
temperature source basically represents an ideal source of thermal energy that is able to maintain the
specified temperature of the system. The convective heat transfer block simulates the heat transfer by
convection. Furthermore, the voltage sensor block converts the voltage measured into a physical signal that
can be captured and displayed.
Figure 4. 1RC equivalent circuit model system architecture in Simulink and Simscape
The 1RC model is required to generate the simulation results which are later compared with the
experiment to verify the accuracy of the model. The 1RC equivalent circuit model has four variable circuit
elements that are SoC dependent. These variable circuit elements are open circuit voltage Voc, series
resistance Rs and RC network, Rp and Cp. These variable circuit elements are implemented through lookup
table. An example of the lookup table is shown in Table 1. The built-in Simulink thermal model is used to
model battery temperature. It is assumed that the heating is primarily from internal resistance and the cooling
is primarily via convection. The model can be used to simulate various operating conditions by just changing
the temperature and current profiles.
Table 1. Example of lookup table used in simscape model
SoC OCV Rs (Ohm) Rp (Ohm) Cp(F)
0.2 1.24 2.13 1.54 6134
0.4 1.27 2.15 1.65 6207
0.6 1.32 2.67 1.73 6398
0.8 1.38 2.45 1.43 6254
1.0 1.43 2.19 1.32 6243
3. RESULTS AND DISCUSSION
Validation of the model is carried out through experiments. The main component of the
experimental setup is the ubiquitin like modifier activating enzyme 5 (UBA5) battery analyzer. The battery
analyzer consists of charging/discharging and measurement subsystems. The former allows
charging/discharging at constant voltage, constant current or constant power modes. The test cycle, which is
user programmable, is used to control the charging and discharging of the battery. The latter includes a built-
in measurement system that can allow simultaneous measurement of both the current and voltage. All of
these subsystems are controlled by the battery analyzer and its associated software which is installed on a PC.
In the experiments, the battery analyzer is used to apply the required current profile and measure the
corresponding voltage response [25]. The NiMH battery can be charged or discharged with a completely

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programmable current profile. The NiMH battery with capacity of 1500 mAh from Energizer is used in the
experiment. The battery is tested to verify the model’s accuracy at room temperature. The block diagram of
the experiment is shown in Figure 5.
The step current pulses of 1-minute width are applied to both the NiMH battery and the model. By
using (3)-(5), the parameter of 1RC battery model can be obtained and apply to the Simulink. The
comparison of the corresponding voltage responses obtained is shown in Figure 6 (a) and 6 (b). It can be seen
that they are in excellent agreement. The difference between the two curves is less than 1.5%, which shows
the high accuracy of the model.
Figure 5. Block diagram of battery experiment
(a)
(b)
Figure 6. Voltage responses obtained from experiment and model with, (a) 1 minute pulse, (b) 2 minute pulse
0 100 200 300 400 500 600 700 800
1.25
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
t (s)
V
B
(V)
Experiment
Model
0 100 200 300 400 500 600 700 800
1.2
1.3
1.4
1.5
1.6
1.7
t (s)
V
B
(V)
Experiment
Model

1799
The validation of the model is also performed for both 1 minute and 2-minute pulse width in order
to test the accuracy of the model. The step current of 2 minute is applied to both NiMH battery and the model
in order to validate its accuracy. The 2-minute pulse width is equivalent to 3.2% of the SoC of the battery.
The percentage difference between the voltage response obtained from both model and NiMH battery is also
less than 1.5% which is very accurate.
Furthermore, the NiMH battery model is also tested with the real wireless sensor node current
profiles obtained from [26]. The current profile of the WSN node includes the sleep, wakeup and ON
conditions of both the micro-controller unit (MCU) and the radio. Both the current profiles during
transmission and reception are considered. The current profile during transmission is shown in Figure 7 (a). It
can be seen that the highest current consumption of the wireless sensor node occurs during the radio
transmission mode. The current profile in reception is also similar to the transmission mode. There are
sudden changes in the current profile of the wireless sensor node when transitioning from one state to
another. The NiMH battery model should be able to allow for these sudden changes of the current profile and
reflect them accurately in the output battery voltage.
The current profiles are applied to the battery model and the corresponding output voltages of the
battery are obtained. Furthermore, the same current profiles are also applied to the real NiMH battery. The
comparison of the output battery voltages of transmission is shown in Figure 7 (b). The percentage difference
between the output battery voltages of model and experiment is less than 2% which is highly accurate. This
compares well with works on Li-ion batteries, where the accuracy reported ranges from 2%-5% [15], [22].
After testing and validating the model with the real current profile of the wireless sensor node, it can be
concluded that the model can be adopted for any sophisticated current profiles of the wireless sensor
networks (WSNs) and IoT devices.
(a)
(b)
Figure 7. These figures are; (a) current profile of wireless sensor node in the transmission mode,
(b) comparison of voltage response obtained from NiMH battery and model
0 2 4 6 8 10 12
0
5
10
15
20
25
30
t (ms)
I
(mA)
MCU Sleep
Radio Sleep
MCU ON
Radio Sleep
MCU ON
Radio Wakeup
MCU ON
Radio Awake
MCU ON
Radio Calibration
MCU ON
Radio Tx
MCU ON
Radio Awake
0 2 4 6 8 10 12
1.264
1.265
1.266
1.267
1.268
1.269
1.27
t (ms)
V
B
(V)
Experiment
Model

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4. CONCLUSION
1RC electrical battery model with simple parameterization for NiMH battery has been presented in
this paper. The parameters are obtained through the pulse measurement technique which includes applying a
series of charge cycles followed by the rest periods. Subsequently, the model is implemented in the physical
and dynamic simulator. To determine the accuracy of the model, two step currents and the real current
profiles of the wireless sensor node are applied to both real-life NiMH battery and the model. Compared to
the previous works, which parameterized Li-ion batteries only, the resulting NiMH voltage responses
obtained from the proposed model show that they are in very good agreement with difference of less than
2%. It can be concluded that the presented model is simple and can be applied to any sophisticated real-life
current profiles of the WSN and IoT, with excellent accuracy. Moreover, the validation of proposed model
with different types of battery chemistry is also recommended.
ACKNOWLEDGEMENTS
The authors gratefully acknowledge the support for this research from the Malaysian Ministry of
Higher Education (MOHE) under the fundamental research grant scheme FRGS/2/2014/TK03/UTP/02/2 and
Yayasan Universiti Teknologi PETRONAS under grant 015LC0-023.
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BIOGRAPHIES OF AUTHORS
Fahad Rasool received a BSc Electrical Engineering degree from the University of
Engineering and Technology, Peshawar, Pakistan, in 2011 and an MSc Electrical and
Electronics Engineering degree from Universiti Teknologi PETRONAS, Seri Iskandar,
Malaysia, in 2018. He is currently the Founder and CEO of Tek Crawler Inc. His research
interests include renewable energy, battery modeling, performance evaluation of wireless
sensor networks and the internet of things, and digital image processing. He has published and
served as a reviewer for several high impact journals and flagship conferences. He has made
several contributions not only in the research community but also in the startup businesses.
Micheal Drieberg received the B.Eng. degree from Universiti Sains Malaysia, Penang,
Malaysia, in 2001, the M.Sc. degree from Universiti Teknologi PETRONAS, Seri Iskandar,
Malaysia, in 2005, and the Ph.D. degree from Victoria University, Melbourne, Australia, in
2011, all in electrical and electronics engineering. He is currently a Senior Lecturer with the
Department of Electrical and Electronics Engineering, Universiti Teknologi PETRONAS. His
research interests include radio resource management, medium access control protocols,
energy harvesting communications, and performance analysis for wireless and sensor
networks. Dr. Drieberg has published and served as a reviewer for several high impact journals
and flagship conferences. He has also made several contributions to the wireless broadband
standards group.
Nasreen Badruddin is an Associate Professor at the Department of Electrical and Electronic
Engineering, Universiti Teknologi PETRONAS, Malaysia, where she has been a faculty
member since 2002. From 2015-2018, she was also the Deputy Head (Postgraduate) of the
department. Nasreen graduated with a first class honours B.Eng. degree in Electronic
Engineering from RMIT University, Australia, in 2000, and an M.Sc. in Electrical & Computer
Engineering from Carnegie-Mellon University, USA in 2002. She then received the Endeavour
Postgraduate Award from the Australian government in 2007 and completed her Ph.D. in
Electrical & Electronic Engineering from the University of Melbourne, Australia, in 2011. Her
research interests are primarily in the area of wireless communications and networks as well as
biomedical engineering, particularly in neuro-signal processing and wireless body area
networks (WBAN), where she is the author/co-author of over 70 research publications.

 ISSN: 2302-9285
1802
Patrick Sebastian is currently a Senior Lecturer in the Electrical and Electronic Engineering
Department at Universiti Teknologi PETRONAS (UTP). He received his PhD in parameteric
tracking with spatial extraction across an array of cameras from Middlesex University,
London. He has interests in the areas of Computer Architectures, Embedded systems, Image
Processing and Video Surveillance. Prior to his current appointment, Patrick was a Senior
Engineer at Penang Seagate Industries Malaysia and an Equipment Engineer in Carsem (M),
Ipoh.
Christopher Teh Jun Qian received his degree in Electrical and Electronic Engineering with
Honours from Universiti Teknologi PETRONAS in 2018, where he is currently pursuing his
MSc degree. He also completed his internship as a research assistant at the University of
Applied Sciences Upper Austria in creating an acoustical sensor system to detect applied
brakes of train wagons.

Electrical battery modeling for applications in wireless sensor networks and internet of things

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Electrical battery modeling for applications in wireless sensor networks and internet of things