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value of the cell fuse
#11
(03-12-2019, 07:59 PM)Stefaan De Ridder Wrote:
(03-12-2019, 07:48 PM)wim Wrote: Those car fuses chould work ... but testing on cell voltage is advised.

https://www.benl.ebay.be/itm/Car-Fuses-S...Swgd1bdwKG

more difficult to solder, but a good option if I can't find glass fuses

best regards

Stefaan
 
In a holder like this ... https://www.benl.ebay.be/itm/2-x-In-line...SwlPRTb-vP
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#12
(03-12-2019, 08:02 PM)daromer Wrote: Living on safe side or not...The fusing was introduced on the smaller 18650 cylindrical LiIon cells. I would say those come from the same system basically and dont behave in same way and therefore I would skip it but thats me. If you are going to have 100s of them in parallel i would do different

Not hard to find datasheet for those cells? First hit on Google: http://www.farnell.com/datasheets/1708366.pdf

that datasheet is more the safety sheet, not the actual technical datasheet, with currents and chargerates. I found that, but not much more.

some references found (russian) say it's manufacured by Sony.

same site stated the 1C and 3C rating.

max charging at 2a

thanks anyway

best regards

Stefaan
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#13
Cell level fusing as Daromer mentioned needs to be considered with regard to overall pack fusing,

 

The main element is that you want the overall pack fuse to go before any of the cell level fuses in a fault condition.

The overrall fuse level then also needs to take into account the surge capability of any large load you have attached, which is usually the inverter. If the inverter is capable of sustaining say 2x the rated output for more than a second then that surge would run the risk of blowing a fuse at that level,

Example of a 48V system would be say an inverter rated for 2.5KWand a surge capability of 6kW. The fusing would need to consider the 6kW load level (depending on how long this can be sustained for).

In this instance you then have a nominal 2.5kW (52 Amps at 48V) and would also be higher at minimum a charge state of the battery of say 46V so around 54 Amps.

The surge of 6kW would also drop the battery pack voltage (depending on size of the pack) and could be say 2V for example. In this situation you may at a low pack charge level then end up with 44V (close to your minimum inverter voltage) going in at maximum surge of 6kW which would then mean a 136A peak.

For a parallel cell setup at 1A per cell this then means your looking at a 136p system minimum (adjust for whatever cell level fuse value your using).

Thougth this might be usefull a bit for this post and a bit more generic explanation for others.
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