Customer Stories: The Importance of Monitoring Lithium-Ion Batteries

Most of today's plug-in hybrid electric vehicles, as well as all-electric vehicles, use lithium-ion batteries. Thus the estimation of battery states is extremely important for safe, reliable and efficient use of these batteries. The challenge to efficiently measure the battery state has now been taken on in a new project called BatterySoC.

Energy storage systems, usually batteries, are essential for electric drive vehicles, such as hybrid electric vehicles, plug-in hybrid electric vehicles, and all-electric vehicles. Most of today's plug-in hybrid electric vehicles and all-electric vehicles use lithium-ion batteries. Lithium-ion batteries are also used in most portable consumer electronics such as cell phones and laptops because of their high energy per unit mass, high power-to-weight ratio, high energy efficiency, good high-temperature performance, and low self-discharge.

BatterySoC is a joint project between Viktoria Swedish ICT and Acreo Swedish ICT, with support from several representatives from the industry. The focus is on battery state estimation by direct measurement of the battery’s physical state of charge.

“Estimation of battery states is of very high importance for safe, reliable and efficient use of lithium-ion batteries in electric vehicles as well as other applications. So far such estimation has proven to be challenging”, says Niklas Legnedahl, specialist at Energy Storage Systems and Function at Volvo Powertrain Corporation, Drivelines & Hybrids.

The main object of the pre-study is to prove and verify the concept of estimating states of lithium-ion batteries with the aid of an electromagnetic sensor which measures the physical state of charge of a battery cell. The new sensing technique has been tested on different types of Li-ion batteries and the result so far is very promising. Our next objective is to plan and prepare for the main study, in which the concept will be demonstrated and evaluated.

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Project: BatterySoC

Customer stories