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Li-ion batteries tout 20,000 charging cycles

Posted: 15 Sep 2014 ?? ?Print Version ?Bookmark and Share

Keywords:lithium ion? EiSiBatt? titanate?

With detail improvements and new materials, lithium ion batteries used in electric vehicles have become safer while extending operating life expectancy. Siemens researchers had recently introduced a demonstrator of a battery that quadrupled the number of charging cycles from 5,000 to 20,000.

This is a result of the Intrinsically Safe Battery (EiSiBatt) research project that aims at developing a safe lithium ion battery technology. The anode of the new battery devised by the Siemens team is not made of graphite but instead of lithium titanate. For the cathode, the researchers replaced the usual lithium metal oxide another material, lithium iron phosphate.

In addition, the researchers from Siemens' Erlangen research centre developed a mathematical model that describes the behaviour of large arrays of hundreds of connected batterieslike those in large energy storages.

Li-ion battery

Also, Tesla Motors is utilising a large array of relatively small lithium ion cells in its cars. Numerous measurements and simulations helped the researchers to understand the behaviour and describe it in a complex model that reproduces the electrical, thermal, and mechanical behaviour of such battery arrays. The simulations enabled them, among other, to understand the behaviour of energy and power in situations when the battery is used to stabilise an electric grid or to control the frequency of an AC grid.

A team of engineers from Chemnitz-based company Drive Technologies developed a battery management scheme that controls their charging status. This software, derived from a Siemens Simotion control program, can also be assigned to further tasksfor instance it can assume the control if batteries are integrated into a drive compound.

Also participating in the project were chemical company Clariant and battery manufacturer Leclanch. Currently, the researcher have created a demonstrator. It remains to be seen when the technology will be industrialised.

- Christoph Hammerschmidt
??EE Times Europe

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