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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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04-24-2018, 01:04 PM | #31 |
Gone Wild
Join Date: Jun 2017
Location: San Diego
Posts: 189
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Re: Lithium Woes - How to avoid house fires!
I specifically chose this system for the BMS. It's supposed to cut off the cart in a low voltage situation, but still have an "emergency reserve" to drive another mile or so, after generating a warning.
But, I'm guessing my BMS was the cause of failure, as it should have shut off WAY before the 5+ volts the damaged cell attained. Having been in the auto service industry for over 30 years, I can say I've seen my share of factory defective parts, this is just the first time I've had such an in-your-face experience. My recommendation to new lithium installers (aside from using the LiFePO4 cells) would be to incorporate a foam surround in the battery box at both the top and bottom, as in the picture I've attached. If I hadn't done that, either the battery box would have failed, adjacent cells damaged, or the cell itself would have burst out the top for lack of space. If multiple cells in the same row fail, however, there may not be enough space for expansion. Another idea would be to make the battery box expandable, for the unlikely event of BMS/cell failures. |
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04-24-2018, 11:07 PM | #32 |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Lithium Woes - How to avoid house fires!
And 18650 cells go into thermal runaway failure on a nearly daily basis worldwide. Whiskers growing in cells puncturing seperators when cells are stored fully charged, is just one failure mode that is on the rise due to manufacturers (mostly in china) cutting corners to cut costs.
I was impressed with how the leaf cells handled that failure. |
04-25-2018, 10:30 AM | #33 |
Gone Wild
Join Date: Jun 2017
Location: San Diego
Posts: 189
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Re: Lithium Woes - How to avoid house fires!
Scary about the 18650s.
I've got several devices that use them, and a few large bluetooth speakers that have banks of them. |
06-06-2018, 08:12 PM | #34 | |
Not Yet Wild
Join Date: Jun 2018
Posts: 43
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Re: Lithium Woes - How to avoid house fires!
Quote:
Couple other questions was hoping someone can help me with -- Other than mileage and driving time is there any advantage the larger Ahr systems? my current cart is lead cell 36V powered, doesn't that mean I can't get larger battery pack without changing the motor etc? Any answers are appreciated. Thanks. |
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06-07-2018, 11:42 AM | #35 |
Gone Wild
Join Date: Jun 2017
Location: San Diego
Posts: 189
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Re: Lithium Woes - How to avoid house fires!
I just received the replacement cells and BMS last weekend. I've got the cells back in the box, and the BMS mounted, but haven't wired it yet.
I should have it wired by the weekend. Before you buy, you may want to see if you can run that motor on 48v. You'll get more speed out of it. The larger amp hour rating will help with distance mostly. |
06-07-2018, 08:25 PM | #36 | |
Not Yet Wild
Join Date: Jun 2018
Posts: 43
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Re: Lithium Woes - How to avoid house fires!
Quote:
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06-08-2018, 10:25 AM | #37 |
Gone Wild
Join Date: Jun 2017
Location: San Diego
Posts: 189
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Re: Lithium Woes - How to avoid house fires!
You first need to decide if you're going to stay with 36v, or go to 48v, then pick the amp hour rating of your kit.
The 72Ah cells are a different size than the 100Ah. |
06-08-2018, 12:24 PM | #38 |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Lithium Woes - How to avoid house fires!
The new 2018 Leaf pack modules are double the height and are heavier. A single module is now 112.6 AH nominal and 14.4V nominal if wired 2p4s.
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06-08-2018, 03:42 PM | #39 |
Not Yet Wild
Join Date: Jun 2018
Posts: 43
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Re: Lithium Woes - How to avoid house fires!
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