Bosch introduces new 48 V Li-ion battery for mild hybrids

Bosch has introduced a new 48-volt Li-ion battery for mild hybrids.

The pack configuration is 12s1p, with 8 Ah NMC/graphite cells. Charge power is 13 kW, and discharge power is 11 kW. The package weighs less than 7 kg, and is standardized for easy integration into new vehicle models. Production is scheduled to start in late 2018.

Bosch says it is already in talks with over a dozen customers for the new battery, and has secured a number of production projects.

The battery requires no active cooling, and its housing is made of plastic to reduce costs. Lithium-ion cells expand during charging and over the course of the unit’s service life, so the housing must withstand a certain amount of stress. Bosch engineers rearranged the cells so that the plastic housing can bear the pressure.

Anticipating a large market for entry-level hybrids, Bosch offers several powertrain components for these models. The company estimates that some 15 million 48-volt hybrid vehicles will be on the road by 2025.

“We at Bosch have long been making up-front investments in electromobility,” says Dr. Mathias Pillin, Head of Electromobility at Bosch. “There are already well over 500,000 electric and hybrid cars fitted with Bosch components. The company invests 400 million euros a year in electromobility. Bosch has years of experience from more than 30 production projects, including in the manufacture of batteries, and that expertise is now bearing fruit.”


Source: Bosch

  • Niels OnWheels

    If I’m right that is less than 0.4kWh of energy. How far could a car potentially drive electric on this? Probably you can make it from your garage to the street. Are there any dimensions known? Could you set this pack in in parallel or series?

    • ECK138

      About 1 to 1.3 miles, depending on the vehicle. Larger vehicles like CUVs and smaller SUVs use about 4 kWh/mi, the newer, more efficient vehicles like the i3 are under 0.3 kWh/mi.
      Actually, your comment about garage to street isn’t far off, although from one side of an intersection to another might be a better comparison. This is for mild hybrids and will only be active when accelerating or decelerating.

      • ECK138

        And the capacity isn’t really the issue, the power is. At 11kW, this isn’t going to accelerate a car fast. It will help the cars engine accelerate the vehicle. Again, that’s why its called a mild hybrid.

        • Niels OnWheels

          I See, thanks for your answer. In this 48V mild hybrid systems, the whole car (navigation, lights, cooling) is running on 48V right? No more 12V battery

          • ECK138

            That will be up to the individual automakers. They’re have been 12V system to handle legacy parts, such as audio systems, but that will be run off a DC-DC converter and may or may not have a small battery.

          • Jim Fox

            Mercedes latest hybrid has 48V for the power train but retains 12V for ancillaries, lighting, etc.

  • Jay Donnaway

    48V mild hybrids are a transitional technology that never took off. I had a 2007 Saturn VUE GreenLine that cost much less and got better MPG than the Ford Escape Hybrid, yet it only used the Belt Assist Starter for hot restarts (not quite as quick or smooth as the planetary geared FordYota Hybrid System). It still carried a heavy 12V starter and battery for cold starts!