[TRNSYS-users] Battery - type47a

[SENTHIL KUMAR, gokula [Student]]

Hello David


Thank you so much for the clear explanation. I will contact you directly to know more about the lithium-ion battery component.


Best Regards

Gokula

PolyU


________________________________
From: David BRADLEY <d.bradley at tess-inc.com>
Sent: Tuesday, April 30, 2019 12:00:50 AM
To: TRNSYS users mailing list at OneBuilding.org
Cc: SENTHIL KUMAR, gokula [Student]
Subject: Re: [TRNSYS-users] Battery - type47a


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, 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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Disclaimer:

This message (including any attachments) contains confidential information intended for a specific individual and purpose. If you are not the intended recipient, you should delete this message and notify the sender and The Hong Kong Polytechnic University (the University) immediately. Any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited and may be unlawful.

The University specifically denies any responsibility for the accuracy or quality of information obtained through University E-mail Facilities. Any views and opinions expressed are only those of the author(s) and do not necessarily represent those of the University and the University accepts no liability whatsoever for any losses or damages incurred or caused to any party as a result of the use of such information.
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