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Battery cooling ideas

Old 07-26-17, 08:43 AM
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Battery cooling ideas

So I have a dolphin 48V battery that I keep in a triangle bag, which fits fairly snug as a top mount bag on my Downtube folder. I added some neoprene pads underneath it for shock protection, but it's fairly insulated ie. hot as it is. While biking last week in 95 degree commute, the power shut off about half way home which I have to believe was the BMS cutting off from overheating.

Aside from unzipping the bag has anyone found ways to cool batteries without drilling holes in the battery packs? I don't really want to ventilate the bag since I got it for the purpose of rain protection. Heatsink? Aluminum foil?

Clearly the simplest thing to do in high heat is reduce load and run on lowest settings, just curious if anyone has made some form of DIY heat management.
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Old 07-26-17, 09:43 AM
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I had a similar experience with a front hub riding offroad, but the battery was a dolphin-type mounted on the down tube, so thought it was the controller. Are you sure it's the battery?
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Old 07-26-17, 09:55 AM
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It was blazing hot and power shutoff on an uphill stretch with 75% left on battery. Never happened before. After a few minutes powered back up for a few minutes and same thing happened. Runs fine now that it's cooled down, my deduction was that enclosed battery + high heat + zero cooling = shutdown.
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Old 07-26-17, 12:21 PM
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Does the dolphin have a USB port? Would one of those USB powered computer fans help? https://www.amazon.com/AC-Infinity-M...uter+fan&psc=1
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Old 07-26-17, 12:27 PM
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K, my system did the same thing on an excruciatingly hot day ascending a steep hill; recovered rapidly; IMO it was the controller, but I have nothing to verify which was the culprit.
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Old 07-26-17, 09:00 PM
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Its usually the controller that has heat issues.

As with regards to the battery heat, cut holes in the neoprene, turn it into swiss cheese, it will still insulate the battery but will allow some air to pass through it.

If you're handy with the sewing machine, cut out sew some mesh windows into that triangle bag too.
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Old 07-27-17, 11:06 AM
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The dolphin does have a USB port. I suppose I could pop a small computer fan in there.

Recovery was pretty fast but I've been biking 2 bafangs in the same heat, same conditions with no issue until I contained the battery that this happened but could very well be the controller. I'm usually going fast enough to air cool the motor imo.
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Old 07-27-17, 04:33 PM
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K, my situation could be completely different since the controller on my front hub bike is at the base of the dolphin battery and not in an area with good wind turbulence. I have a rectangular battery in a triangle pack insulated with foam for my BBS02; that has never had a problem even with heavy use in pretty high heat.
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Old 08-03-17, 10:52 AM
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I doubt the battery was the culprit. Take a water bottle with you on the next hot ride. It should be easy to pinpoint the real culprit with a little cooling power.

-SP
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Old 08-16-17, 09:56 AM
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Welp lost power completely and upon inspection it was in fact the controller.
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