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The Battery Management System (BMS) is designed to monitor and control the traction lithium-ion battery for hybrid and electric vehicles. Within the battery pack, a communication network is established between the Battery Control Unit (BCU) and the Cell Sensor Units (CSU) to collect the information measured from each individual cell. The current BMS communications systems employ standard bus systems (e.g. CAN-Bus) and therefore require the installation of a very large amount of additional wiring, which creates a negative impact on cost, weight, construction complexity, and the galvanic isolation of the cells. In the context of the IntLiIon project, we study different alternatives to solve this problem. In this work, we are presenting a feasibility study of a wireless approach for the BMS communications system. This study comprises the evaluation and measurement of different antenna types and frequency ranges for the wireless channel inside the battery pack.

Typical powerline networks feature frequencyselective attenuation which has a relatively high dynamic range and sometimes large notches. This fact is usually idealized with flat in-band attenuation during the performance evaluation of PLC modems. Thus the noise margin under these channel conditions cannot be measured. Inserting L-C-R resonance circuits between devices under test (DUT) can introduce some kind of frequency-dependent attenuation of the transmit signal, However this method suffers from low flexibility, low accuracy and high complexity. This paper proposes a channel emulatorbased platform for the performance test of powerline communications (PLC) modems in frequency range up to 500 kHz. It is capable of emulating the frequency-dependent channel characteristics accurately and conveniently. The result of margin tests shows that different techniques as well as different implementations of the same technique have different performance with the same channel; single-carrier modulations have higher margins as multi-carrier and spread spectrum modulations. All these facts can only be revealed by employing realistic channel conditions, therefore the flat attenuation is insufficient for a comprehensive and persuasive performance evaluation.

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