Pete1961
10 W
Hi, I have had the offer of a very good deal on a new type of battery but the maker does not supply a charger. he has though given me the charging algorithm preferred by the factory. This is (1) 0.5C constant current for 100 mins, temp must not exceed 50 deg C, rest battpack for 5 mins, then (2) a topping charge of 0.5C for 10 mins until pack voltage reaches 43.2 V or temp reaches 50C
I have read elsewhere that the part (2) can be omitted without damage but at a cost of the top 5% of charge. Also that phase (1) can be done by 0.5C @ CC up to 1.9v per cell
But I believe the maker leans toward pack temp monitoring in case any single cell shorts internally as the pack ages - thus the sum of 1.9V per cell would never be reached whist the rest would be cooked
I propose monitoring pack temp with a probe thermostat inc built in alarm set at 50C, Either manual control or a timer to cover the time req.
The difficult bit is this, adapting or making a 4 or 5 amp charger to an adjustable voltage & current, & doing it economically. I have come up with the following parts,
1) A 4.5 amp SLA charger (says a cut off is optional at extra cost, maybe better without) http://www.ebay.co.uk/itm/Electric-Bike-36V-4-5A-18ah-Lead-Acid-Battery-Charger-E-bike-Scooter-Ebike-ATV-/321316528598?pt=Battery_Chargers&hash=item4acff521d6
2)This CC / CV module fed by the above charger output http://www.ebay.co.uk/itm/390839859624?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
I have the option of an 8A/h battery or a 10A/h, my thoughts are with the above set up the smaller one would be better as the would be a bit of spare capacity in the system. Would the above set up work???
I think the maker of the Ni Zn F cells is trying to break into the bike market but mainly supplies cells for the UPS & similar back up markets. Otherwise I can leave the whole thing for a while & hope that a suitable commercial ebike charger emerges. One thing these cells hate is any kind of long term trickle charge, hence the need for a 4 or 5 amp charger. I am hoping one of you electronics guys may know more, or anyone who has opened this style of charger. Thanks, Pete
I have read elsewhere that the part (2) can be omitted without damage but at a cost of the top 5% of charge. Also that phase (1) can be done by 0.5C @ CC up to 1.9v per cell
But I believe the maker leans toward pack temp monitoring in case any single cell shorts internally as the pack ages - thus the sum of 1.9V per cell would never be reached whist the rest would be cooked
I propose monitoring pack temp with a probe thermostat inc built in alarm set at 50C, Either manual control or a timer to cover the time req.
The difficult bit is this, adapting or making a 4 or 5 amp charger to an adjustable voltage & current, & doing it economically. I have come up with the following parts,
1) A 4.5 amp SLA charger (says a cut off is optional at extra cost, maybe better without) http://www.ebay.co.uk/itm/Electric-Bike-36V-4-5A-18ah-Lead-Acid-Battery-Charger-E-bike-Scooter-Ebike-ATV-/321316528598?pt=Battery_Chargers&hash=item4acff521d6
2)This CC / CV module fed by the above charger output http://www.ebay.co.uk/itm/390839859624?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
I have the option of an 8A/h battery or a 10A/h, my thoughts are with the above set up the smaller one would be better as the would be a bit of spare capacity in the system. Would the above set up work???
I think the maker of the Ni Zn F cells is trying to break into the bike market but mainly supplies cells for the UPS & similar back up markets. Otherwise I can leave the whole thing for a while & hope that a suitable commercial ebike charger emerges. One thing these cells hate is any kind of long term trickle charge, hence the need for a 4 or 5 amp charger. I am hoping one of you electronics guys may know more, or anyone who has opened this style of charger. Thanks, Pete
