Mercedes-Benz is researching a way to make an EV battery's voltage a matter of software rather than wiring. In today's packs, many cells are connected in series to reach high voltage, so the system voltage depends on how many cells there are and on their state of charge, Auto Bild explains. The Mercedes-Benz Power Converter is meant to remove much of that link.
How it works
- Micro-converters per cell: Programmable micro-converters control the energy flow of single cells or cell groups and keep the output voltage stable, up to 800 volts, regardless of each cell's charge or age.
- Parallel, not series: Auto Bild says the approach relies on cells connected in parallel, with a converter on each.
- Voltage by update: According to Auto Bild, Mercedes says the voltage could in future even be adjusted with a software update, without rebuilding the battery.
- AC and DC: The converter handles both alternating and direct current, with scope for bidirectional charging, Automotive World reports.
Why it matters
Because output voltage would no longer depend on the number of cells in series, Mercedes says battery design could become far more flexible. Combining functions that now need separate parts could also cut losses and help range in battery-electric and plug-in hybrid models.
Still early
The current converter generation delivers up to 3 kW. Automotive World notes that traction-level power would therefore need many units working in parallel. Mercedes showed the project alongside two glass-based display concepts, and gave no production timing for any of them.