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A battery model to represent the behavior under high frequency excitation, e.g. induced by the current ripple of power electronics, has been proposed. It is based on an equivalent circuit that consists of an inductive constant phase element that is approximated by an almost arbitrary number of RL -circuits.
The results of the experiments indicate that lithium-ion battery cells cycled with low frequencies experience a 1% to 2% higher impedance increase and capacity fade than battery cells cycled with high ac frequencies.
The results are summarized in a physical-based HF battery model, which can be used for simulating highly dynamic battery applications such as battery power line communications (PLC) and impulsive noise investigations on the automotive high voltage (HV) power train.
Therefore, with regards to battery lifetime, high frequencies can be tolerated as long as temperatures are considered as well. This new finding may help us to reduce the costs of products with complex battery systems, such as EVs. References is not available for this document.
High frequency (HF) properties of lithium-ion (Li-ion) batteries receive growing attention, as an increasing number of highly dynamic loads are present in today's hybrid or battery electric vehicles (HEV, BEV). In this paper, we address the need for a better understanding of the HF characteristics of cylindrical Li-ion cells.
Battery powered energy systems such as electric vehicles utilize power electronics for controlling energy flows between the battery and the load or generation, respectively. Therefore, the battery is under high frequency stress due to fast switching power electronic devices.
Each winding is connected to a high-frequency H-bridge, by which the high-frequency voltage is converted into DC voltage. More windings and high-frequency H-bridges can be introduced on …
A battery model to represent the behavior under high frequency excitation, e.g. induced by the current ripple of power electronics, has been proposed. It is based on an …
After the lead-acid battery was charged with high frequency pulse, the battery had lower internal resistance and the voltage of the fully-charged battery and the cold cranking …
This paper explains three different methods to measure the frequency-dependent impedance of actual high-voltage batteries up to 10MHz. For comparison and evaluation of the techniques …
The results are summarized in a physical-based HF battery model, which can be used for simulating highly dynamic battery applications such as battery power line …
6 · The synergy from the complex and nanocomposites endows our LIBs with a high voltage of 4.85 V, a high energy and power density of 284.5 Wh kg-1 and 2.8 kW kg-1, and a …
The battery voltage and current ripple components are extracted by using FFT analysis and then used to calculate the battery complex impedance values at the switching frequency. By …
Uno, M. & Tanaka, K. Influence of high-frequency charge–discharge cycling induced by cell voltage equalizers on the life performance of lithium-ion cells. IEEE Trans. …
High frequency charger by S.P.E. The energy saving Q-Batteries high frequency charger are designed to charge 24V, 48V and 80V AGM, GEL and wet batteries in forklifts, floor cleaning …
other hand, high-frequency impedance measurements normally require instruments with a high …
This paper presents an online battery complex impedance measurement method at high frequency values by utilizing the battery voltage and current switching rippl
This paper explains three different methods to measure the frequency-dependent impedance …
High voltage battery systems need to be designed and developed with a focus on safety given these voltage ranges. Automotive systems today are already operating at 400 …
It is crucial to know if certain frequencies accelerate battery degradation and should be avoided. This applies in particular for EV batteries with an expected lifetime of more …
The ripple on high DC voltages can be decreased either by smoothing the voltage after the rectification using a high voltage capacitor or/and by a high-frequency supply …
The first thing to discuss is whether high frequency ripple current affects the voltage output curve of the battery at long-time scale. The first data set is acquired using the …
The commonly used High Frequency AC High Voltage resonant transformer is the Tesla coil, which is a doubly tuned resonant circuit shown schematically in Fig. 6.13a. The primary voltage rating is 10 kV and the secondary may be rated to …
4 · Ternary high-nickel oxide exhibits a relatively high working voltage compared with traditional lithium battery cathodes (LiFePO4, etc.). Consequently, it has been widely studied …