An ASIC-Based Miniaturized System for Online Multi-Measurand Monitoring of Lithium-Ion Batteries

Manfredini, Giuseppe; Ria, Andrea; Bruschi, P.; Gerevini, Luca; Vitelli, Michele; Molinara, Mario; Piotto, M.

doi:10.3390/batteries7030045

Cited by 13 publications

(13 citation statements)

References 31 publications

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“…The described technique holds potential with the new cell-level sensors and distributed battery management systems (BMS), such as the ones proposed by the cell management unit (CMU) from Sensichips [17] since individual cell re-calibration and measurement are made possible. Potential industrial and practical applications of the proposed method are in the electric vehicle and stationary energy storage fields.…”

Section: Discussionmentioning

confidence: 99%

“…In this paper, the proposed method's feasibility is verified by applying it to experimental data, which consist of current and voltage measurements obtained using a commercial source measure unit (SMU) lab instrument on a lithium polymer battery under test following a realistic operational profile for electric vehicles. Although the feasibility study of the proposed method is carried out using lab instrumentation, the technique can potentially enable online cell-level condition monitoring for in situ and in operando applications [16], made possible by integrated cell management units (CMUs), such as the one proposed by Manfredini et al [17].…”

Section: Introductionmentioning

confidence: 99%

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On the Usage of Battery Equivalent Series Resistance for Shuntless Coulomb Counting and SOC Estimation

et al. 2023

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In this paper, a feasibility study of a shuntless coulomb counting method for estimating the state of charge (SOC) of a battery is presented. Contrary to conventional coulomb counting, the proposed method does not require an external resistive shunt; it instead only requires voltage measurements performed on the battery under test while it is operating. The current is measured indirectly using the battery’s equivalent series resistance (ESR). The method consists of a preliminary calibration phase where the ESR and the open-circuit voltage of the battery are measured for different SOCs and stored in look-up tables (LUTs). Then, in the subsequent operational phase, the method uses these LUTs together with the measured voltage at the battery terminals to estimate the SOC. The performance of the proposed method is evaluated on a sample lithium polymer (LiPo) battery, using a realistic current profile derived from the Worldwide Harmonized Light-Duty Vehicles Test Procedure (WLTP). The results of this experimental evaluation demonstrate a SOC estimation root-mean-square error of 0.82% and a maximum SOC error of 1.45%. These results prove that the proposed method is feasible in a practical scenario.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Usage of Battery Equivalent Series Resistance for Shuntless Coulomb Counting and SOC Estimation

et al. 2023

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“…Recently, we presented a CMU [17] based on a single-chip versatile sensor interface, the SENSIPLUS (SP) integrated circuit. Even though it was not originally designed for battery monitoring, the SP was shown to be particularly useful for the purpose of building compact multi-measurand CMUs able to perform high-resolution online Electrochemical Impedance Spectroscopy (EIS).…”

Section: Introductionmentioning

confidence: 99%

Online High-Resolution EIS of Lithium-Ion Batteries by Means of Compact and Low Power ASIC

et al. 2023

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A compact electronic circuit capable of performing Electrochemical Impedance Spectroscopy (EIS) on either single Lithium-ion cells or modules formed by the series of two cells is presented. The proposed device, named Double Cell Management Unit (DCMU), constitutes an important improvement to a recently proposed cell management unit, which combined EIS acquisition functions with a multichannel sensor interface compatible with thermistors, strain-gauges and moisture detectors. The proposed circuit maintains the versatility of the previous version and significantly extends the EIS frequency range, allowing vector impedance measurements from 0.1 Hz to about 15 kHz. The capability of handling both single Lithium-ion cells or series of two cells is obtained by adding a few external components to the previous version. This also allowed increasing the stimulation current to a maximum amplitude of 200 mA, resulting in improved resolution. Experiments consisting in EIS acquisition performed on batteries of different capacity at different temperatures and states of charge are described. Estimated impedance resolution (standard deviation) is 20 μΩ obtained at 1 kHz with a stimulation current of 100 mA amplitude.

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“…Furthermore, the measurement unit, which often replaces a benchtop instrument, must be designed for small form factor devices and a low power profile, while maintaining performance close to gold standard instruments. Application-specific integrated circuit (ASIC) based devices fulfill these requirements, such as the ones developed to perform online electrochemical impedance spectroscopy (EIS) for characterization of lithium-ion battery packs [ 18 , 19 , 20 ]. This technology can be extended to other applications in areas where size and power consumption are crucial.…”

Section: Introductionmentioning

confidence: 99%

“…The Arduino-based EIS is already a huge improvement over conventionally used RCL-bridges (resistance, capacitance, inductance) and lock-in detectors. Similarly, the ASIC-based miniaturized system for Online-EIS proposed by Manfredini [ 19 ] shows how versatile the ASIC device is, being capable of measuring not only the impedance of commercial batteries, but also capacitive and resistive sensors. The device is based on the SENSIPLUS, which is a System on a Chip (SoC) solution that uses minimal external hardware, and shows performance on a par with gold standard instruments.…”

Section: Introductionmentioning

confidence: 99%

An Ultra-Low-Cost RCL-Meter

Inácio

Guerra

Stallinga

2022

Sensors

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An ultra-low-cost RCL meter, aimed at IoT applications, was developed, and was used to measure electrical components based on standard techniques without the need of additional electronics beyond the AVR® micro-controller hardware itself and high-level routines. The models and pseudo-routines required to measure admittance parameters are described, and a benchmark between the ATmega328P and ATmega32U4 AVR® micro-controllers was performed to validate the resistance and capacitance measurements. Both ATmega328P and ATmega32U4 micro-controllers could measure isolated resistances from 0.5 Ω to 80 MΩ and capacitances from 100 fF to 4.7 mF. Inductance measurements are estimated at between 0.2 mH to 1.5 H. The accuracy and range of the measurements of series and parallel RC networks are demonstrated. The relative accuracy (ar) and relative precision (pr) of the measurements were quantified. For the resistance measurements, typically ar, pr < 10% in the interval 100 Ω–100 MΩ. For the capacitance, measured in one of the modes (fast mode), ar < 20% and pr < 5% in the range 100 fF–10 nF, while for the other mode (transient mode), typically ar < 20% in the range 10 nF–10 mF and pr < 5% for 100 pF–10 mF. ar falls below 5% in some sub-ranges. The combination of the two capacitance modes allows for measurements in the range 100 fF–10 mF (11 orders of magnitude) with ar < 20%. Possible applications include the sensing of impedimetric sensor arrays targeted for wearable and in-body bioelectronics, smart agriculture, and smart cities, while complying with small form factor and low cost.

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An ASIC-Based Miniaturized System for Online Multi-Measurand Monitoring of Lithium-Ion Batteries

Cited by 13 publications

References 31 publications

On the Usage of Battery Equivalent Series Resistance for Shuntless Coulomb Counting and SOC Estimation

On the Usage of Battery Equivalent Series Resistance for Shuntless Coulomb Counting and SOC Estimation

Online High-Resolution EIS of Lithium-Ion Batteries by Means of Compact and Low Power ASIC

An Ultra-Low-Cost RCL-Meter

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