Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
Originally Posted by stevedebi
(Post 235227)
You know Bill, I've seen this comment before. It is odd that the owners manual implies that it actually charges:
"If the jump start button is pressed, but the indicator on the button flashes slowly, the low voltage (underhood) battery may not have enough energy to charge the high voltage battery. " Maybe they just didn't want to provide the details, or do the systems differ between the years (this is from the 2008 FEH manual)? "In order to make emergency jumping safe, a special jump start switch and electronic module steps 12 volts up to 330 volts. Because the Escape Hybrid also has a conventional 12 volt battery to run lights and accessories, the emergency jump could come from itself." http://www.gulfcoastnews.com/RT2005FordEscapeHybrid.htm GaryG |
Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
Originally Posted by GaryG
(Post 235288)
Hi Steve
"In order to make emergency jumping safe, a special jump start switch and electronic module steps 12 volts up to 330 volts. Because the Escape Hybrid also has a conventional 12 volt battery to run lights and accessories, the emergency jump could come from itself." http://www.gulfcoastnews.com/RT2005FordEscapeHybrid.htm GaryG mentioned here the "jump start button" actually warms the battery not charge it. FWIW to design a circuit to take 12vdc to 330VDC, even at about 1AMP ( 330W ), would be quite a trick. |
Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
Originally Posted by wilcal
(Post 235294)
I suggest that that article has actually got it wrong. As previously
mentioned here the "jump start button" actually warms the battery not charge it. FWIW to design a circuit to take 12vdc to 330VDC, even at about 1AMP ( 330W ), would be quite a trick. When testing the Jump Start Switch according to the WS Manual, one connection test for 5 ohms and the other at 10,000 ohms, is this a heater switch? What kind of heater could heat the entire pack cells in ten minutes? Does this heater provide power to the internal battery fans? I've used the Jump Start Switch in my '05 FEH to charge my battery after replacing my 12V battery when the relays were bad. I heard no battery fans! Here is a good link comparing Hybrids and eCVT fluid change requirements Bill will enjoy. http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1016&context=auto_pres&sei-redir=1#search=%22Ford+Escape+Hybrid+HV+Battery+Ju mp+Start+Procedure%22 |
Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
I guess it should be easy enough to check with a scan gauge set to measure
bat. temp and SOC. I ws assuming it warmed the HV bat. by drawing current from it. |
Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
The SIU manual/link GaryG provide states the oil is to be changed every 5 thousand miles. The Ford owners manual states 10 thousand miles. Are there other errors in this link?
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Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
garyg: if you understood the chemistry of a battery you'd understand why warming it up increases capacity, even at 90ºF.
eCVT oil: just using the Ford tech note. Subdewd: the warming circuit warms the traction battery with a separate warming circuit, not by drawing current from the traction battery. |
Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
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Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
Originally Posted by Bill Winney
(Post 235329)
garyg: if you understood the chemistry of a battery you'd understand why warming it up increases capacity, even at 90ºF.
http://data.energizer.com/PDFs/nicke...ide_appman.pdf |
Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
A review of basic chemistry would be useful. Electro-potential increases with temperature. That's it, even in your citation. ...And that's what Ford is trying to do by warming the battery with their gadget.
Don't confuse battery life versus temperature with a one time start attempt by warming the battery. |
Re: HV battery pack and 12V battery discharged...how to re-charge it faster?
Originally Posted by Bill Winney
(Post 235360)
A review of basic chemistry would be useful. Electro-potential increases with temperature. That's it, even in your citation. ...And that's what Ford is trying to do by warming the battery with their gadget.
Don't confuse battery life versus temperature with a one time start attempt by warming the battery. In fact, this reference http://www.national.com/appinfo/power/files/f19.pdf says one of the advantages of Li-ion over NiMH is "The Li-Ion cell does not suffer a significant capacity loss at high temperatures, as the discharge curves at 20°C and 60°C are virtually identical." and for NiMH, "At elevated temperatures, the cell experiences two undesirable effects: a) The A-hr capacity of the cell reduces" Also this reference http://www.hardingenergy.com/pdfs/3%...%20Hydride.pdf says the same thing, that actual capacity, not cycle life, decreases above 25C for NiMH batteries. I really don't think warming the battery would help at all if the battery was at 20C or more already, and all the technical data says it would actually hurt. However, I did two jump starts and saw the following: SoC did not change at all. Battery temp did not change at all. HV Battery voltage changed, going from 328 to 338. 12V dropped from 12.7 to 11.7. Also my 10A Schumacher charger popped during the second jump start, I guess from too much current. |
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