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<p>Gokula,</p>
<p> 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. <br>
</p>
<p> 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.</p>
<p> 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.</p>
<p>kind regards,</p>
<p> David</p>
<p> <br>
</p>
<div class="moz-cite-prefix">On 04/28/2019 22:52, SENTHIL KUMAR,
gokula [Student] via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:HK0PR01MB21460EDAF11F25CE8A3F7119CC390@HK0PR01MB2146.apcprd01.prod.exchangelabs.com">
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<p style="margin-top:0; margin-bottom:0"><span
style="font-family: Calibri, Helvetica, sans-serif,
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Emoji", NotoColorEmoji, "Segoe UI Symbol",
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Trnsys Users </span></p>
<p style="margin-top:0; margin-bottom:0"><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 12pt;"><br>
</span></p>
<p style="margin-top:0; margin-bottom:0"><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 16px;"></span><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 12pt;">In the
description of the battery(Type-47a), it is written that ''</span><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 12pt;"><i>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<span style="background-color:
rgb(255, 255, 255);"> </span><span
style="background-color: rgb(255, 255, 255);"><span
style="background-color: rgb(255, 255, 0);">the rate
of charge or discharge</span>. </span><span
style="background-color: rgb(255, 255, 255);">T</span>his
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.''</i> 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.</span><br>
</p>
<p style="margin-top:0; margin-bottom:0"><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 12pt;"><br>
</span></p>
<p style="margin-top:0; margin-bottom:0"><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 12pt;">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. </span></p>
<p style="margin-top:0; margin-bottom:0"><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 12pt;"><br>
</span></p>
<p style="margin-top:0; margin-bottom:0"><span
style="font-family: Calibri, Helvetica, sans-serif,
EmojiFont, "Apple Color Emoji", "Segoe UI
Emoji", NotoColorEmoji, "Segoe UI Symbol",
"Android Emoji", EmojiSymbols; font-size: 12pt;">Thanking </span></p>
<p style="margin-top:0; margin-bottom:0"><b>Gokula</b>
Manikandan Senthil Kumar </p>
<p style="margin-top:0; margin-bottom:0">Ph.D. Student </p>
<p style="margin-top:0; margin-bottom:0">Department of Building
Services Engineering </p>
<p style="margin-top:0; margin-bottom:0">The Hong Kong
Polytechnic University</p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
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