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This paper focuses on explaining how the increasing demand of a faster charging system has a direct influence on the emergence of 800V powertrain architectures. In the recent years, thanks to the introduction of SiC and GaN technologies on power electronics and the improvements on battery power density, the adaption of 800V architectures is becoming noticeable. At the same time, OEMs are pushing to have charging sessions from 0 to 80% SOC on less that 20 min. These challenging constraints opens a door to innovative solutions in the market, this paper does not only explain such disruptive architectures but will additionally explain their performance in charging capacity. The paper deals with how the innovations implemented by major OEMs on their 800V platforms works through powertrain investigation. A consistent review on the powertrain components has been performed and disrupted technologies has been pointed out through component teardown. Finally, as a result a comparison of the performance in charging capacity has been studied under different scenarios: DC fast charge, 400V DC charge, AC charge and DC charge at extreme temperature has also been analysed. An objective analysis of the high-power charging is done with some descriptive graphs and description containing: - Charger power, Battery power, Aux. systems power, Battery Temperature vs Time - Charger power, Battery power, Aux. systems power, Battery Temperature vs SOC - AC compressor power, PTC heater power, DCDC power vs Time - AC compressor power, PTC heater power, DCDC power vs SOC - Accumulative battery energy and SOC vs Time - C-rate vs Time - Energy distribution and Overall efficiency The study has been limited to EVs in the European market and the data used for charging analysis has been based in public information. Analysis of the behaviour of the powertrain under high power charging conditions has not been published by the authors in the past. Another novelty of this study is the use of public information to perform the analysis, without the need of additional testing. The paper finally presents power electronics solutions for 800V powertrains, the thermal behaviour when the system works in high power charging and data analytics on the performance of the charging sessions. The 800V platform shows clear advantages in comparison with 400V systems, mainly with an improved charge efficiency, higher maximum and sustained power, and as a result of that a shorter battery recharge time. KEYWORDS: Higiene power charging, Electric vehicle, 800V, Extreme temperature



Dr. Javier Arturo Corea, Senior product coordinator, IDIADA

Are 800V Architectures Game Changers For High Power Charging?

FWC2023-REI-003 • FISITA World Congress 2023 • Road & energy infrastructure

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