High frequency battery

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.

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. 1. Introduction

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.

This article proposes a novel method to characterize the battery beyond typical EIS frequencies. Developing a novel fixture to mount a single battery and applying proper de-embedding techniques enable a cell characterization from 1 kHz up to frequencies as high as 300 MHz using the 2-port shunt-through vector network analyzer (VNA) method.

First in literature, all these effects are measured and summarized in an equivalent electrical circuit model, which predicts the cell's impact on HF current pulses. Lithium-ion (Li-ion) batteries in electric vehicles are exposed to high slew rate currents originating from the power electronics.

For PLC performance prediction, it is also essential to quantify how the battery's HF impedance depends on different cell designs and how it changes over a wide range of ambient temperature and the state of charge (SOC). Only a few publications are available dealing with the cell's behavior at high frequencies from a physical point of view.