A Scalable Active Battery Management System With Embedded Real-Time Electrochemical Impedance Spectroscopy

Din, Eric; Schaef, Christopher; Moffat, Keith; Stauth, Jason T.

doi:10.1109/tpel.2016.2607519

Cited by 136 publications

(69 citation statements)

References 39 publications

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“…But the volume, control complexity and cost are higher than the first type. Figure 3 shows the third type, the number of energy storage components of this type is greater than or equal to the number of batteries [1,[11][12][13][14][15][16][17]. This type of circuit has a large number of cells and buck-boost circuits working at the same time, and the equalization current is large, which means this type of circuit has the fastest equalization speed of the three types.…”

Section: Introductionmentioning

confidence: 99%

A Novel Lithium Battery Equalization Circuit with Any Number of Inductors

Kang

Luo

et al. 2019

Energies

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Even with the same voltage level, different types of battery packs have different requirements for the volume of the battery equalization circuit. However, most equalization circuits have the same problem: the volume of the equalization circuit is fixed once the voltage level of the battery pack is determined. In order to solve this problem, this paper proposes a novel lithium battery equalization circuit with any number of inductors (ECANI). It can select any number of inductors less than half the number of batteries, even when the voltage level of the battery pack is determined. Simulation and experiments are used to verify the performance of the equalization circuit. The current error and the average final voltage error in the experiment are 1.69% and 0.33% lower than those in the simulation, respectively. So the circuit can achieve equalization with good accuracy.

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Section: Introductionmentioning

confidence: 99%

A Novel Lithium Battery Equalization Circuit with Any Number of Inductors

Kang

Luo

et al. 2019

Energies

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“…A distributed impedance measuring units mounted on the battery cell injects perturbing signals into the battery cells separately. The current and the response voltage are sampled locally to calculate the impedance [31,32]. In a centralized impedance measuring method, a high power converter perturbs the battery module.…”

Section: Introductionmentioning

confidence: 99%

Practical On-Board Measurement of Lithium Ion Battery Impedance Based on Distributed Voltage and Current Sampling

2018

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Abstract:Battery impedance based state estimation methods receive extensive attention due to its close relation to internal dynamic processes and the mechanism of a battery. In order to provide impedance for a battery management system (BMS), a practical on-board impedance measuring method based on distributed signal sampling is proposed and implemented. Battery cell perturbing current and its response voltage for impedance calculation are sampled separately to be compatible with BMS. A digital dual-channel orthogonal lock-in amplifier is used to calculate the impedance. With the signal synchronization, the battery impedance is obtained and compensated. And the relative impedance can also be obtained without knowing the current. For verification, an impedance measuring system made up of electronic units sampling and processing signals and a DC-AC converter generating AC perturbing current is designed. A type of 8 Ah LiFePO 4 battery is chosen and the valuable frequency range for state estimations is determined with a series of experiments. The battery cells are connected in series and the impedance is measured with the prototype. It is shown that the measurement error of the impedance modulus at 0.1 Hz-500 Hz at 5 • C-35 • C is less than 4.5% and the impedance phase error is less than 3% at <10 Hz at room temperature. In addition, the relative impedance can also be tracked well with the designed system.

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“…Replicating this technique within an online situation is not without challenges and some attempt has been made within published literature. Within the field of energy storage these can be split into those techniques which use additional hardware to generate a separate excitation circuit [2]- [6] and those that use the main power electronic circuitry [7]- [16] to generate that excitation signal. A separate excitation circuit requires additional hardware in the system which can be expensive.…”

Section: Introductionmentioning

confidence: 99%

“…The first method can maintain a high frequency switching operation but at the cost of additional low frequency harmonics in the circuit, while the second method can only excite the circuit at the fundamental frequency which limits the ability of the circuit to undertake a full frequency sweep and generate useful information. It has also been shown that it is possible to generate an excitation signal using power electronic controlled inductor based battery balancing hardware [15], [16]. This paper uses a completely different and novel method of injecting a low frequency excitation signal using existing hardware by manipulating the Earth Leakage Monitoring (ELM) hardware that may be present in the system.…”

Section: Introductionmentioning

confidence: 99%

Online impedance spectroscopy estimation of a dc-dc converter connected battery using an earth leakage monitoring circuit

Vamosfaderani

Strickland

2017

2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)

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Citation: VARNOSFADERANI, M.A. and STRICKLAND, D., 2017. Online impedance spectroscopy estimation of a dc-dc converter connected battery using an earth leakage monitoring circuit. ABSTRACTElectrochemical Impedance Spectroscopy (EIS) techniques are useful tools for being able to look at the characterisation of batteries under different conditions and/or with different material components. However, EIS analysis is mostly undertaken offline with bespoke equipment. This paper describes a method of undertaking EIS measurement on-line without the use of additional equipment by manipulating the earth leakage monitoring circuit to generate low frequency excitation signals to analyse a battery system connected to a dc/dc converter. This paper describes the methodology and presents some experimental results compared with off line EIS results generated with more traditional EIS equipment under the same conditions to illustrate the concept.

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A Scalable Active Battery Management System With Embedded Real-Time Electrochemical Impedance Spectroscopy

Cited by 136 publications

References 39 publications

A Novel Lithium Battery Equalization Circuit with Any Number of Inductors

A Novel Lithium Battery Equalization Circuit with Any Number of Inductors

Practical On-Board Measurement of Lithium Ion Battery Impedance Based on Distributed Voltage and Current Sampling

Online impedance spectroscopy estimation of a dc-dc converter connected battery using an earth leakage monitoring circuit

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