36V Bosch tool battery for e-bike use
- Thread starter WheezyRider
- Start date
That's interesting. Don't forget the battery and the device that it's working work as a team. It's probable that the LVC is in the device, not the battery. It looks like it does the charge control by temperature rather than voltage. That Bosch battery kit is the same.
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Speculation on another forum:
https://www-pedelecforum-de.translate.goog/forum/index.php?threads/bosch-36v-2-6ah-sicherung-defekt.29165/&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp
...there are rather a lot of datasheets to trawl through:
BOSCH 1 607 502 093 Datasheets
https://www.datasheetarchive.com/BOSCH%201%20607%20502%20093-datasheet.html
It doesn't matter what it is. We know that the battery can do 30A. You don't need anything near that, so stick a 25A one in or whatever floats your boat. You can unsolder it and solder in a car blade type fuse or any other type. A fuse is a fuse.
You would think the temp sensor would play an important role, but it seems as if the sensor circuit is grounded when attached to a charger or a tool?
Well there are different types, like slow or quick blow...
It's likely to be 30A as are there are 2 strings of cells, each with a max rating of 15A.
Do a search for glass fuses, should be able to find something at 30A:
I cant answer that. There website below claims 'Protection against overheating through temperature monitoring' in link below. Many mobile phone batteries also have an extra terminal for temp sensing. My understanding is that if you want quick charging, its best to monitor the temperature.
The Bosch 18V POWER FOR ALL battery system. | Bosch DIY
THE battery for your home. Do-it-yourself. Garden. Household.
www.bosch-diy.com
The PCB on the 18V battery is very different, for example, it seems to have a proper BMS, monitoring individual cells.I cant answer that. There website below claims 'Protection against overheating through temperature monitoring' in link below. Many mobile phone batteries also have an extra terminal for temp sensing. My understanding is that if you want quick charging, its best to monitor the temperature.
The Bosch 18V POWER FOR ALL battery system. | Bosch DIY
THE battery for your home. Do-it-yourself. Garden. Household.
The other possible explanation is that the temperature sensor although fitted to battery is not used.
It appears the 6.0Ahr batteries are diferent, someone is selling the battery packs themselves with this claim "Our Bosch battery Pack comes with an original 36V 6,0Ah Electronic components"
https://www.ebay.co.uk/itm/234725132393?hash=item36a6b54869:g:3h4AAOSw6UdjQA2q&amdata=enc:AQAIAAAA0FlJ7Aw78J8xsJlzo5WgqWE3/tupcMGHxo5UQV8xH7AbSlDpAZdzqiHdzvMGgiKDRXKrQE6t0CcYBJSnLqg+Lr8W4AQdo/Pg8p0igdZFM7jWmEtwMzTMA/1e2FaAFc7/WXgYnjAaZ+RnMy0gm/lJEtvM9Ey+372/K9lpFoqimTkGkB8wQ55ra5vlNd2jNHE3qXaOgExpau8F0Ixfu+OFb8Lsuf5xjAWaP/DhewMCnSsdSvRR7Ml3Ywju2tKuFs659h0qQSUUWCikOn55ViS+feM=|tkp:Bk9SR4iPzba8Yg
Now the ends of the pack show what appear to be balance wires;
We cannot see if there are ballance wires in the middle of each row of cells.
However the look of the electronics board does not immediatly suggest it has a bunch of power FETs;
https://www.ebay.co.uk/itm/234725132393?hash=item36a6b54869:g:3h4AAOSw6UdjQA2q&amdata=enc:AQAIAAAA0FlJ7Aw78J8xsJlzo5WgqWE3/tupcMGHxo5UQV8xH7AbSlDpAZdzqiHdzvMGgiKDRXKrQE6t0CcYBJSnLqg+Lr8W4AQdo/Pg8p0igdZFM7jWmEtwMzTMA/1e2FaAFc7/WXgYnjAaZ+RnMy0gm/lJEtvM9Ey+372/K9lpFoqimTkGkB8wQ55ra5vlNd2jNHE3qXaOgExpau8F0Ixfu+OFb8Lsuf5xjAWaP/DhewMCnSsdSvRR7Ml3Ywju2tKuFs659h0qQSUUWCikOn55ViS+feM=|tkp:Bk9SR4iPzba8Yg
Now the ends of the pack show what appear to be balance wires;
We cannot see if there are ballance wires in the middle of each row of cells.
However the look of the electronics board does not immediatly suggest it has a bunch of power FETs;
The same seller has a similar 4Ah unit and that has the same PCB. The end photo on that you can see 10 wires, so it looks like it is a proper BMS. If there are power MOSFETs, they may be on the underside.
There are no MOSFETs. You can see that the power terminals are connected directly to the cell-pack.
Yes, I think you're right. So it balances but still no LVC, or individual cell protection on discharge and current over protection only by fuse.
Maybe if the battery goes out of balance the 'controller' senses that and somehow uses the central connector to flag an error to the charger or tool, which stops the battery being used or charged.
The key is to look at a charger, is it able to read a signal put out on the top leaf of the central connector .....
The key is to look at a charger, is it able to read a signal put out on the top leaf of the central connector .....
I've heard tale that some newer phones shut down when a battery circuit reports a temperature of over 40 degrees Centigrade (worryingly, this is lower than cream cheese melting temperature). I don't think it's beyond the realms of possibility that a massive company like Bosch has destruction tested many batteries, and discovered that excessively elevated temperatures of battery packs is an early indication of imminent failure - would ebike fires be prevented perhaps, if abnormally high temperatures were detected (and the battery cease being used) several charges before they burst into flames?I cant answer that. There website below claims 'Protection against overheating through temperature monitoring' in link below. Many mobile phone batteries also have an extra terminal for temp sensing. My understanding is that if you want quick charging, its best to monitor the temperature.
The Bosch 18V POWER FOR ALL battery system. | Bosch DIY
THE battery for your home. Do-it-yourself. Garden. Household.
the battery in the picture can't be a 36V. Look at where the red and black wires are soldered to.