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This paper presents a sinusoidal ripple current (SRC) emulator which superimposes an ac ripple current frequency into a dc charging current in order to produce a sinusoidal ripple current without a ripple current controller. It can be used for several purposes: 1) to analyze the impact of ac ripple current magnitude and frequency on the battery internal characteristics; 2) to determine the parameters...
The use of batteries and other electrochemical devices in modern power systems is rapidly increasing, with stricter requirements in terms of cost, efficiency and reliability. Innovative monitoring solutions are therefore urged to allow a successful development of a wide range of emerging applications, including electric vehicles and large-scale energy storage to support renewable energy generation...
The development of electrically driven cars focuses primarily on the battery since this is the restraining factor for driving range and performance. In addition to this DC characteristic, the battery also has a high-frequency behaviour which has to be evaluated in order to ensure proper functionality, system stability, supply voltage quality and EMC. This paper explains three different methods to...
The impedance represents one of the most important performance parameters of the Lithium-ion batteries since it used for power capability calculations, battery pack and system design, cooling system design and also for state-of-health estimation. In the literature, different approaches are presented for measuring the impedance of Lithium-ion batteries and electrochemical impedance spectroscopy and...
Abstract-The knowledge of the state of a battery is a prerequisite for the battery management system to be able to increase the reliability, lifetime and safety of the entire energy storage system. Impedance spectroscopy is a well-known measurement technique for electrochemical systems. Once the method is implemented in the battery management system and performed online during operation it could provide...
One of the main challenges in the development of electric car propulsion systems is to ensure their functional stability regarding system control and EMC. Especially since all components are developed independently by several suppliers with minor knowledge about the overall system the component is included later on. Up to now the first system compatibility is not performed before all components are...
Online diagnostics for monitoring of battery cells in a battery pack is necessary in order to determine the state of the battery pack, like its age and safe operation. It could also provide the possibility to adjust the operation strategy of the battery management system and the load to increase the battery lifetime and safety. Impedance spectroscopy is a well-known measurement technique for electrochemical...
This paper presents a fast cost-effective technique for the measurement of battery impedance online in an application such as an electric or hybrid vehicle. Impedance measurements on lithium-ion batteries between 1 Hz and 2 kHz give information about the electrochemical reactions within a cell, which relates to the state of charge (SOC), internal temperature, and state of health (SOH). We concentrate...
We present a fast, low-cost approach to measure battery impedance ‘on-line’ in a vehicle across a range of frequencies (1–2000 Hz). Impedance measurement has promise for improving battery management since it is a very effective non-invasive method of diagnosing the internal state of an electrochemical cell. It is useful for estimating temperature, ageing, state of charge (SOC) and for fault detection...
Impulse radio ultra-wideband (IR-UWB) is being employed in several IEEE standards for Wireless Sensor Network (WSN). This paper presents a battery model for small form factor, zinc-air button cell batteries with high energy density but also high internal impedance. Their usage in small form factor IR-UWB radios, requires accurate modeling to enable proper power management system design, avoiding system...
An AC impedance-based technique for active online measurements of Li-ion battery systems is developed in this paper. An AC impedance technique is proposed to estimate state of charge (SOC) for Li-ion battery. The technique includes a set of static and dynamic measurements that are required for state of charge estimation. In this paper, potentiostatic measurements of Li-ion batteries and AC signal...
This paper provides a method and a system based on current pulse excitation and frequency spectrum analysis, which can complete battery impedance spectrum test and analysis. By exerting current excitation onto the battery, synchronously measuring current excitation and terminal voltage response, we count the amplitude spectrum and phase spectrum for current excitation and terminal voltage response...
This paper introduces an applicable method for measuring battery's internal impedance. The proposed method is based on the concepts of electrochemical impedance spectroscopy. In this method a small perturbation is imposed on the battery's current and the voltage response is measured. The impedance is calculated by the ratio of voltage and current variation. The dependency of impedance respect to frequency...
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