[TRNSYS-users] Battery - type47a

[David BRADLEY]

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


On 04/28/2019 22:52, SENTHIL KUMAR, gokula [Student] via TRNSYS-users wrote:
>
> 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, giventhe 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 at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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