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Old 12-18-2012, 05:39 PM   #1 (permalink)
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Default Battery help please

I removed my battery pack in troubleshoot 1449 code.
While checking the voltages of the cell sticks on the BCM c connector they are all roughly the same, say 15.5, except cell stick pair 5. This reads zero between the grn/rd and grn/wh wires,
Now if i check red to white it reads 155 volts.
Soo, i presume that stick 5 bad. Correct? What next, would grid charge help?

Last edited by Subdewd2; 12-19-2012 at 07:10 AM.
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Old 12-19-2012, 05:51 AM   #2 (permalink)
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I don't really understand what you're doing, but each stick has a nominal voltage of only 7.2V, and will be a bit above 8V when fully charged (I think 1.44V X 6 at max). Sounds like you're trying to measure voltages through the BCM wiring, and as I understand it, there's only 1 voltage tap for every 2 sticks, so perhaps you're getting readings for 2 sticks, which would be around 16V...
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Old 12-19-2012, 07:06 AM   #3 (permalink)
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yes, exactly. I am checking through the harness. I need to break down the pack but was wondering if the grid charging would be of any help if there was no output from that pair of sticks whatsoever.
edited above for clearity, hopefully

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Old 12-19-2012, 07:44 AM   #4 (permalink)
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My guess would be 'no', grid charging won't help, if you know for certain that, 1) you are measuring the voltage of a pair of sticks and 2) that voltage is truly zero. If the cells are that dead I don't think charging will help. But I could be wrong. I don't think it'd hurt to try, though. Hook up a grid charger, keep your voltage meter on the sticks that are supposedly bad, and see what happens. Conceptually, the rest of the sticks will take some charge, but once they're charged they'll dissipate the current as heat. Meanwhile, the 'bad' sticks should continue to charge - if they can take a charge at all...

There's some inexpensive constant current power supplies that have recently been used quite a bit for grid charging - 2 in series produce about 300 mA at ~180V unloaded. I bought some recently and put together a charger. Works fine. Amazon sells them, "GINO" power supplies, like $12 a piece... There's a thread somewhere around here, I think in the "Mods" forum, with the title 'grid charger power supplies'...
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Old 12-19-2012, 07:56 AM   #5 (permalink)
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hey thanks, kind of figured. I've got a couple power supplies on the way already.
Damn, you're either up real early or out real late.
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Old 12-19-2012, 08:06 AM   #6 (permalink)
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hey, take some picts and/or point me to where I can figure out how to measure stick voltages without disassembling the pack. That'd be pretty useful to know how to do...
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Old 12-19-2012, 08:19 AM   #7 (permalink)
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I will provided I can post pics. Otherwise if you have the wireing diagram, under IMA there's what's called the "battery condition monitor" (BCM) connector, top front of of battery module. It's a 2 row 20 pin(female) connector in a harness with a smaller 8 pin connector that goes to the other module.
still learning the conventions but I think it's designated the C connector.
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Old 12-19-2012, 09:05 AM   #8 (permalink)
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Here's a couple things to help getting to measure sub-pack voltage at the BCM. I'll have to work through it later:



Image of Mike D.'s battery monitor diagram (original in pdf somewhere at 99mpg.com):


Mike D.'s picts of the pack and how it's wired:
http://99mpg.com/blog/batterypacksexpose/howitiswired/
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Old 12-19-2012, 09:45 AM   #9 (permalink)
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Well the voltages on the jumper side seem fine. Perhaps a pull down resistor is open or the sense line open? If so my lucky day I guess. The previous owner had the battery replaced 3 years ago. He got sick of dealing with it and I got a deal on it knowing the 1449. Ever seen or heard of this happening where the sense wire opened?
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Old 12-19-2012, 09:55 AM   #10 (permalink)
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I haven't heard of anything like that...

Is this how you are measuring voltages at the BCM connector? For example, to measure combined voltage of sticks 19 and 20 (as numbered in Mike D.s pack images), negative probe at VHB11 (connector terminal 10 according to Honda diagram) and positive probe at VHB10 (connector terminal 10)? This is what I deduce from the picts and diagram, mostly from the diagram (though the diagram enumerates 'sticks' in the opposite direction from the images)...

sticks 19 & 20, -VHB11 +VHB10
sticks 17 & 18, -VHB10 +VHB9
sticks 15 & 16, -VHB9 +VHB8
sticks 13 & 14, -VHB8 +VHB7
sticks 11 & 12, -VHB7 +VHB6
sticks 9 & 10, -VHB6 +VHB5
sticks 7 & 8, -VHB4 +VHB3
sticks 5 & 6, -VHB3, +VHB2
sticks 3 & 4, -VHB2, +VHB1
sticks 1 & 2, -VHB1, +VHB0
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