Gokula,
I have a Li-ion battery model written; it is planned for
eventual release in the TESS Libraries but there is not yet a
timeline. From my experience, I would say that Type47 is not very
good for modeling Li-ion batteries. The current/voltage
characteristic, especially close to the fully-charged point of a
Li-ion battery is quite different than it is for a lead-acid
battery.
If you are getting energy balance problems with Type47 and higher rates of charge/discharge, one thing I would look at is whether the energy balance improves when you shorten the time step.
The development schedule for the actual Li-ion battery model could be moved up and the model could be available as an individual component in the near term. Please contact me directly if you are interested.
kind regards,
David
Hello Trnsys Users
In the description of the battery(Type-47a), it is written that ''This model of a lead-acid storage battery operates in conjunction with solar cell array and power conditioning components. It specifies how the battery state of charge varies over time, given the rate of charge or discharge. This proforma corresponds to Mode 1, based on a simple energy balance of the battery. The power is simply taken as input. This model does not calculate nor output any values of current or voltage.'' It seems that the component type-47a is developed based on the charging/discharge rate of lead-acid battery, usually, it is low. From the simulation, I experienced that the error percentage in Energy Balance increases when increasing the charging/discharging rate. I also read the Trnsys forum, there it is mentioned that the Type-47a is not suitable for lithium-ion battery, but it was written many years before.
Please explain, whether the type47a is suitable to do the function of a lithium-ion battery. If not, please suggest a suitable component type for that.
Thanking
Gokula Manikandan Senthil Kumar
Ph.D. Student
Department of Building Services Engineering
The Hong Kong Polytechnic University
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-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 3 North Pinckney Street - suite 202 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com