rfranzk Posted February 27, 2006 Report Share Posted February 27, 2006 Hi Ante!!! I have welded a few battery packs with my capacitive discharge welder and am looking for a source for the pepi thermal fuses, or information on how to configure pptc device to battery pack. The pptc resistance changes with temperature and I am unsure how temperature rises during the charge cycle will affect overall operation. I have looked hi and lo for sources and have had no luck on the pepi. Thanks in Advance. rfranzk Quote Link to comment Share on other sites More sharing options...
ante Posted February 27, 2006 Report Share Posted February 27, 2006 Hi rfranzk,I think you are referring to a PolySwitch like these: http://www.elfa.se/pdf/60/06027007.pdfI buy mine at ELFA http://www.elfa.se/en/They look like this: Quote Link to comment Share on other sites More sharing options...
rfranzk Posted February 27, 2006 Author Report Share Posted February 27, 2006 Hi Ante!! Yes it is a polymer positive temperature coefficient switch!! I am curious about using them to protect the batteries of a cordless tool during the charge process. Most battery packs use a thermal circuit breaker that measures battery temperature and cuts off charge current. http://www.pepiusa.com/ The pptc will change resistance at temperature. I am unsure as to whether these can be surface mounted to battery to sense battery temperature or whether they change temperature and resistance based on current flow or resistance to flow? Also what do I consider when choosing the proper device? Thanks for the quick replyrfranzk Quote Link to comment Share on other sites More sharing options...
ante Posted February 28, 2006 Report Share Posted February 28, 2006 Hi rfranzk,I might have misunderstood you, this is PPTC as you mentioned. These are not supposed to regulate or interrupt the charging process but protect the battery pack from burning up in case of a short circuit or overload condition.This might be what you are looking for: http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&dok=2009881.htm Quote Link to comment Share on other sites More sharing options...
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