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Old 02-09-2021, 09:52 PM   #763 (permalink)
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Originally Posted by redpoint5 View Post
If a car were a mild hybrid it would simplify things to have a single 48v high capacity traction battery. Would there even be a need for contactors that disconnected a 48V traction pack when the car is "off"? It seems all cars should probably at least be mild hybrid so they can shut off when stopped while running accessories, start with the traction motor/batteries, and get a little boost of power so the engine could be undersized. Maybe a 1kWh battery pack?
The RAM and JEEP eTorque have a 48-volt power, 12 cell, 430 watt-hour lithium-ion battery. However, they keep the 12V lead acid battery and charge it through a DC - DC converter. It is a simple belt driven system that replaces the alternator.

Mercedes EQ Boost is a step farther. It gets rid of the starter and alternator and replaces them with a pancake motor between the engine and transmission. The engine is "beltless" with the A/C and water pump, and an electric supercharger powered by 48V motors. It has a 0.8 kWh li-ion battery and gets rid of the 12V starting battery.
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