GE, Ford, University of Michigan in ARPA-E project to develop a smart, miniaturized sensing system for EV batteries; smarter BMS for longer life
3 August 2012
GE researchers, in partnership with Ford Motor Company and the University of Michigan, are developing a smart, miniaturized sensing system that has the potential to significantly extend the life of automotive traction batteries over the conventional battery systems used in electric vehicles today. The $3.1-million project is funded by the US Department of Energy’s (DOE) ARPA-E. (Earlier post.) In a separate ARPA-E-funded $3.1-million project, Ford is working with Arbin Instruments to develop a high-precision battery testing device to improve battery-life forecasting and validation.
To improve the life and reduce the lifecycle cost of EV batteries, GE will combine a novel ultra-thin battery sensor system with sophisticated modeling of cell behavior to control and optimize battery management systems. The goal of the three-year program is to demonstrate a working sensing system in an actual electric vehicle.
The car battery remains the greatest barrier and most promising opportunity to bringing EVs mainstream. Improvements in the range, cost and life of the battery will all be needed for EVs to be competitive. With better sensors and new battery analytics, we think we can make substantial progress at increasing battery life. This, in turn, could help bring down its overall cost and the cost entitlement of buying an electric car.—Aaron Knobloch, principal investigator and mechanical engineer at GE Global Research
Today’s sensors on EVs and plug-in hybrid vehicles (PHEVs) measure the health of the battery by looking at factors such as its temperature, voltage, and current. However, these measurements provide a limited understanding of a battery’s operation and health. The goal of the ARPA-E project will be to develop small, cost-effective sensors with new measurement capabilities.
Due to their small size, these sensors will be placed in areas of the battery where existing sensor technologies cannot be currently located. The combination of small size and ability to measure new quantities will enable a much better understanding of battery performance and life.
A group of scientists from the University of Michigan, led by Anna Stefanopoulou, a professor of mechanical engineering, will use the data generated by GE sensors to verify advanced battery models. They will ultimately create schemes that use instantaneous sensor data to predict future battery-cell and battery-pack behavior.
Ensuring a battery’s health over many cycles requires taking frequent snapshots of its condition as it ages. Control systems on cars have to be able to use this vast amount of data quickly and efficiently. Information provided by advanced sensors will allow us to create and verify finely resolved physical models to underpin battery management schemes. The big challenge is to make battery management programs adapt and work fast.—Charles Monroe, a chemical engineering professor on the University of Michigan team
The use of sensors in conjunction with real-time models will enable novel algorithms that optimize how the battery system is managed to extend its life. To demonstrate the capabilities of the sensor system and analytics, Ford will integrate them into one of their vehicles for validation.
Big data. The creation of this smart sensing platform illustrates the great potential of product development in the age of the Industrial Internet, GE noted. Every piece of industrial equipment, including batteries, generates volumes of data about its condition and operation. With the power of analytics, this data can be used to create more intelligent devices and systems that lead to improved performance for the customer.
In November 2011, GE announced an aggressive expansion of its software programs to harness big data and take industrial product development to the next level. The company has opened a global software headquarters in San Ramon, California, which will employ 400 new software professionals to support these efforts across GE’s business portfolio.
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