Battery Pack temperature sensor (Thermistor)

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Hi, all:-

Is there any standard for the thermistor used in battery packs?
10K? B=????

Best regards,
Best regards,
Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)
On Wed, 05 Sep 2007 12:27:30 -0400, Spehro Pefhany

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Yes.  The thermistor is specified in the smart battery data
specification, which can be found here: http://sbs-forum.org/specs /

The thermistor is Semitec 103AT.  http://www.semitec-usa.com /

================================

Greg Neff
VP Engineering
*Microsym* Computers Inc.
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Re: Battery Pack temperature sensor (Thermistor)

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Thanks, Greg.

Unfortunately, that B (3435 +- 1%) is not very widely available. 8-(

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Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)
On Wed, 05 Sep 2007 13:17:40 -0400, Spehro Pefhany

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That's why everyone uses the Semitec parts.  You should be able to get
them here: http://www.paltronicsltd.com/linecard.php

I don't know how the spec was approved using a single-source part.
This is a perfect example of how not to specify a component within a
spec.

================================

Greg Neff
VP Engineering
*Microsym* Computers Inc.
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Re: Battery Pack temperature sensor (Thermistor)

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Thanks, we`ll do so.

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That particular Japanese company is one of the most experienced in the
thermistor field (the first by a long shot to develop very cheap yet
high precision parts AFAIR), but you`d think there would be second
sources..

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Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)
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Well, what do you expect from a passel of bureaucrats? If they knew
their elbow from a hole in the ground, they wouldn't have got the job
of bureaucrat in the first place. ;-)

Cheers!
Rich


Re: Battery Pack temperature sensor (Thermistor)

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Ishizuka`s representative probably wrote that part of the spec. ;-)

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Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)
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Why in the world would you care about your battery temp to 1%?  Isn't
the point just to avoid setting them on fire with the charger?

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Ben Jackson AD7GD
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Re: Battery Pack temperature sensor (Thermistor)

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Well, yes and no.  Another problem is cold temperature charging, which
can damage cells, reducing the capacity.  Also a B value tolerance of
1% does not directly translate to a temperature accuracy.  See:
http://www.semitec.co.jp/RT/AT/103AT1_11.xls

The Smart Battery Data Specification requires that the smart battery
be able to report temperature with an accuracy of ▒3░K.  So, you need
an accurate thermistor to meet this performance requirement.  I don't
know the origin of the requirement.

================================

Greg Neff
VP Engineering
*Microsym* Computers Inc.
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Re: Battery Pack temperature sensor (Thermistor)
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During a design review I stated that my heater-control thermistor
circuit could sense the temperature on a display within 5 degrees C.
When I was asked if that was good enough, I replied "We're not making
beer".



Re: Battery Pack temperature sensor (Thermistor)
On Wed, 05 Sep 2007 13:16:32 -0700, Richard Henry

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See:http://www.semitec.co.jp/RT/AT/103AT1_11.xls
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What *were* you making?


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Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)
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Ruggedized displays.


Re: Battery Pack temperature sensor (Thermistor)
On Thu, 06 Sep 2007 08:02:26 -0700, Richard Henry

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Ah, I see. I thought you were displaying the measured temperature (my
usual requirement) rather than measuring the temperature of the
display!

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Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)
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We could have gotten a more accurate measurement of the display
temperature if we had placed the thermistor in the center of the
display.  However, the useers would not like that.



Re: Battery Pack temperature sensor (Thermistor)
On Wed, 05 Sep 2007 13:17:40 -0400, in sci.electronics.design Spehro

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nothing available from here?
http://www.ysitemperature.com/ind-therm.html


Martin

Re: Battery Pack temperature sensor (Thermistor)
Un bel giorno Spehro Pefhany digit˛:

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Digikey gives me nine different models (they differ in resistance tolerance
and package):
P12007CT-ND
P12008CT-ND
P12009CT-ND
P12010CT-ND
P12011CT-ND
P12012CT-ND
P12013CT-ND
P12014CT-ND
P12011DKR-ND

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Re: Battery Pack temperature sensor (Thermistor)
On Thu, 06 Sep 2007 18:00:52 GMT, dalai lamah

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The B is not exact. It is supposed to be 3435, not 3375.

Best regards,
Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)
Un bel giorno Spehro Pefhany digit˛:

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B depends on the range for which it's defined. The NTCs that I've listed
have a B of 3375 for the range 25-50 ░C, and a beta of 3435 for the range
25-85 ░C. Just like the Samitec 103AT.

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Re: Battery Pack temperature sensor (Thermistor)
On Thu, 06 Sep 2007 21:10:14 GMT, the renowned dalai lamah

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Ah, now that's helpful. Thank you!


Best regards,
Spehro Pefhany
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Re: Battery Pack temperature sensor (Thermistor)


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Whoa, what incredible performance, wonder how much they run in small
quantity.


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