Bosch powertube repair

Batteries, Chargers, and Battery Management Systems.
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paul-home   100 mW

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Bosch powertube repair

Post by paul-home » Feb 17 2020 4:47am

Has anyone on here attempted to repair a Bosch Powertube battery? I picked up 4 500wh powertubes on ebay for £25 each.
All the cells are LG 3500mah. They are all discharged to just a few Millivolts. The design of the pack makes we wonder if its possible to repair. The BMS is mounted on a flexible PCB which is spot welded down the length of the pack.

wheeliepete   1 mW

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Re: Bosch powertube repair

Post by wheeliepete » Feb 17 2020 5:56am

If you are in the UK, contact Jimmy at ebikebatteries.co.uk, he may be able to re-cell them for you, although if there is zero voltage in the pack, the BMS is likely to be toast.

obcd   100 W

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Re: Bosch powertube repair

Post by obcd » Feb 17 2020 7:54am

Bosch doesn't like it if you mess with their batteries. If you disconnect the cells from the bms or even disconnect one of the balance wires, the bms "shuts off" and refuses to restart afterwards. It needs some factory hocus pocus to come back to live.
I have no idea if your packs are like that, but modern bosch ones are.

Pajda   1 kW

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Re: Bosch powertube repair

Post by Pajda » Feb 17 2020 8:56am

Can you add some photos of disassembled pack? But I agree with others, when the Bosch BMS is disconnected from the battery, it locked itself and it is no longer usable.

hemo   100 W

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Re: Bosch powertube repair

Post by hemo » Feb 17 2020 10:34am

Jimmy in London at ebikebatteries.co.uk I believe parallels the BMS to another source (likey the new cell pack) once this is done the old cells can be disconnected. Though if a cell group is toast the BMS may well be bricked.
He recelled my brothers Bosch pack but that was a Gen 1 or 2 pack.

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PaulD   1 kW

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Re: Bosch powertube repair

Post by PaulD » Feb 17 2020 12:03pm

paul-home wrote:
Feb 17 2020 4:47am
All the cells are LG 3500mah. They are all discharged to just a few Millivolts.
It's not recommended to revive cells that have been discharged below about 1V. At low voltage copper tends to dissolve into the electrolyte and gets re-deposited onto the electrode during charging, and cause shorts. Many BMS are designed to prevent charging if a cell ever drops this low.

paul-home   100 mW

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Re: Bosch powertube repair

Post by paul-home » Mar 22 2020 7:19am

Sadly its true. I have spent a lot of time rebuilding the pack, the BMS is somehow locked out.
If anyone figures out how to re-initialise the BMS, please let me know!

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