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Bosch on developing battery and hybrid technology

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March 4, 2015

Electric car charging
Electric cars: new battery technology will change ownership experience of electric vehicles

 

  • Lithium-ion batteries have potential to reach 280 Wh/kg energy density
  • Batteries twice as powerful as current ones due in next five years from Bosch
  • Electric vehicle batteries have more than one lifetime
  • Automated driving could change battery technology

Today’s lithium-ion batteries, for example, have to be designed to run for at least 150,000 kilometres and to last up to 15 years. Even then, after spending all this time in the car, the battery still has to possess 80 percent of its original storage capacity and performance. Within the next five years, Bosch intends to offer high-voltage batteries that are twice as powerful. At the same time, the company is exploring new battery technologies.

Development: the path to the next generation of lithium-ion batteries

Lithium-ion technology: Today’s lithium-ion batteries have an energy density of approximately 115 Wh/kg, but have the potential to go as high as 280 Wh/kg. To research the next generation of lithium-ion batteries, Bosch has joined forces with GS Yuasa and Mitsubishi Corporation in a joint venture called Lithium Energy and Power.

“The goal of this joint venture is to make lithium-ion batteries up to two times more powerful,” says Dr. Joachim Fetzer, member of the executive management of the Gasoline Systems division of Robert Bosch GmbH responsible for electromobility.

Beyond lithium-ion: Bosch’s corporate research department is working on future batteries, such as those made using lithium-sulfur technology, which promises greater energy density and capacity. Bosch estimates that the earliest the lithium-sulfur battery will be ready for series production is the middle of the next decade.

Progress: battery management results in 10 percent more range

Battery management: In terms of high-performance batteries, Bosch is focusing on driving forward the monitoring and management of the various cells as well as the overall system. Sophisticated battery management can further increase the range of a car by up to 10 percent – without altering the cell chemistry.

 

Lithium ion charge and discharge process

Infrastructure: automated vehicles have an effect on battery technology

Rapid charging points: If there are lots of places where you can quickly charge your electric vehicle, then this will have a major impact on battery technology. The faster an electric vehicle’s battery can recharge, the less important its range becomes.

Automated driving: Fully automated vehicles make charging much more straightforward, since they can search for charge spots without any assistance from the driver. How this works is demonstrated by V-Charge, a project spearheaded by Bosch, VW, and a number of European universities. The idea is that within a parking garage, for instance, the driver would be able to use a smartphone app to direct their electric vehicle to a charge spot. When the driver comes back, the car returns to the pick-up spot by itself.

Three lifetimes: for a high-voltage battery, the car is just the first step

Different stages in the life of a battery: A fleet vehicle, which drives a significant distance in a short space of time, requires a new battery with full performance and capacity. In contrast, a slightly used battery can work just as well in cars that are driven only occasionally for short routes. That would reduce the overall cost of an electric car. Even after twelve years – the average service life of a car – the battery still retains 80 percent of its original performance and capacity. This means its components can still be useful, for example as a power storage unit.

‘Second Life’ project with BMW and Vattenfall: In Hamburg, used batteries from electric vehicles are being joined together to form a large power storage system. It can provide energy within seconds and helps stabilise the grid. With this project, Bosch, the BMW Group, and Vattenfall are working together to drive electromobility and energy storage forward.

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