Electronics > Projects, Designs, and Technical Stuff
Removable 18650 Battery Management System (BMS)
skipper762:
Hi all,
I have a device that takes two 18650 batteries which are removable for recharge. The device needs to have battery protection most likely in some form of BMS as they have all the niceties for safety.
However, all BMS's I have looked into require a reset after an under-voltage shutdown has occurred (AKA the device has run out of battery and has shut down).
This means when charged batteries are put back into the device, the BMS won't reenable the output until a charge voltage is applied. The device doesn't and can't have a charger to provide this reset charge voltage. Is there any know BMS's out there that have this ability?
Thanks.
viperidae:
Can you just use protected 18650's?
amyk:
--- Quote from: viperidae on October 09, 2019, 05:42:19 am ---Can you just use protected 18650's?
--- End quote ---
Or the standard DW01 protection circuit (two of them, one for each cell).
kjr18:
--- Quote from: amyk on October 09, 2019, 11:29:55 am ---
--- Quote from: viperidae on October 09, 2019, 05:42:19 am ---Can you just use protected 18650's?
--- End quote ---
Or the standard DW01 protection circuit (two of them, one for each cell).
--- End quote ---
Unless those would be attached directly to cells, they still need to get this reset voltage. Using protected cells would be good enough.
This device that OP mentions, needs them serial or in parallel?
skipper762:
We have thought about using protected cells, however, it relies on protected cells always being used.
If the user was to replace the protected cell with an unprotected cell, the device would have no protection.
Like kjr18 mentioned, the DWO1 BMS still needs the "resetting" charge voltage applied to release the Undervoltage lockout (UVLO).
As well as using an off the shelf BMS we have tried rolling our own from a TPS2565 hot-swap controller as this has over current, short circuit and under-voltage protection (without the lockout).
However, the Q current of the hot-swap chip is too high (250uA, about 100 times the sleep current of the rest of the device).
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