Abstract
Electric vehicles (EVs) are without a doubt one of the hottest topics of our time because of their advantages over combustion engine vehicles. This has persuaded many developers to try improving EVs so they will be more reliable and cheaper and as a result suitable for a broader range of consumers.In this paper we dive into the proper way of measuring and understanding the impedance of one prismatic cell from 100 kHz up to 1 GHz. Some common measurement mistakes and important points to notice are also explained. The effect of a power bar is shown as well. In order to make sure of the accuracy and the consistency of the measurements, they are compared with finite element simulations as well as with mathematical calculations.Investigations of conducted emissions are also of key importance since it has a direct influence on selecting a suitable frequency range. Accordingly, a thorough lab measurement is conducted to see the distortion harmonics and their influence on the carrier frequency. This knowledge can then be used to implement the power line communication (PLC) method.The PLC technique helps us to reduce the wire harness of a battery pack by using the existing high-voltage lines of the vehicle as the main transmission channel. This leads to cheaper battery packs by reducing the amount of used material for the wire harness and production time as well as assembly complexity.
Highlights
Compared to combustion engine cars, electric cars produce less noise and pollution
Utilizing a 25 MHz carrier signal for modulation techniques such as frequency shift keying (FSK) or phase shift keying (PSK) allow us to reach a data rate which is higher than 2 Mpbs and as it was explained before, the conducted emission at this frequency is very weak
The main focus of this paper was to characterize the impedance of a prismatic li-ion battery cell in order to be used in a power line communication (PLC) application for a BMS system in Electric vehicles (EVs)
Summary
Compared to combustion engine cars, electric cars produce less noise and pollution. These factors are what attracts so many new and old established companies to invest in electric cars. The reason for 85 cm is that the VNA is calibrated heft 1.2021 This means that if we use a 100 cm cable, all the measured values lower than 35 MHz are acceptable the values which are read after 35 MHz are not reliable values even if they are close to the real value. The DUT is a 50 calibration resistor and we can see that the blue curve is reading exactly that value (excluding the measurement noise) the red curve exhibits a swinging behavior In this case we can accept the values of the red graph when it is lower than. We should not have any extra cable length which is not calibrated when we are measuring a very low impedance DUT and this is exactly what we are going to measure on a prismatic cell (prismatic cells have small impedance)
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