Question for the group - Should I use holders for a 18650 24v LiPO battery pack or not?
I have built some packs for e-bikes in the past but due to space I simply pack them tightly and then spot weld them together. No fuses per cell.
Looking to replace some of the SLA batteries that I am using in a mobility scooter and electric wheelchair, both are 24V devices. Looking to build one to be equivalent of or greater capacity of 15Ah first up for the mobility scooter, then the big one is the electric wheelchair, stock is 50Ah SLA which will take a while to build!
Planning to use a Daly 7s LiPo BMS with these setups, Bluetooth for info/setup, set max to 4.1v per cell, and then having to mod a 7s LiPo charger to charge based on that.
Since joining this group and having over 1000 18650 cells to now sort out and determine what ones I will use for the pack, I have been thinking if there is another practical reason for using the standard 18650 holders that I am seeing people use.
Example image: https://secondlifestorage.com/index.php?attachments/image_vuzozr-jpg.19309/
I am guessing that the advantage is that the cells are air-gapped - similar to one I have found with the Ego 56v batteries, which means that if one cell gets excessively hot, the others are not affected as much. I am also thinking that you could take out a faulty cell easier if you find one that requires replacement? (Dreading this bit so planning carefully and working out the best matched cells to do this with!)
Are there any other advantages? I have space to do this in these devices, and however means that I cannot pack them with more power with the gaps.
I have built some packs for e-bikes in the past but due to space I simply pack them tightly and then spot weld them together. No fuses per cell.
Looking to replace some of the SLA batteries that I am using in a mobility scooter and electric wheelchair, both are 24V devices. Looking to build one to be equivalent of or greater capacity of 15Ah first up for the mobility scooter, then the big one is the electric wheelchair, stock is 50Ah SLA which will take a while to build!
Planning to use a Daly 7s LiPo BMS with these setups, Bluetooth for info/setup, set max to 4.1v per cell, and then having to mod a 7s LiPo charger to charge based on that.
Since joining this group and having over 1000 18650 cells to now sort out and determine what ones I will use for the pack, I have been thinking if there is another practical reason for using the standard 18650 holders that I am seeing people use.
Example image: https://secondlifestorage.com/index.php?attachments/image_vuzozr-jpg.19309/
I am guessing that the advantage is that the cells are air-gapped - similar to one I have found with the Ego 56v batteries, which means that if one cell gets excessively hot, the others are not affected as much. I am also thinking that you could take out a faulty cell easier if you find one that requires replacement? (Dreading this bit so planning carefully and working out the best matched cells to do this with!)
Are there any other advantages? I have space to do this in these devices, and however means that I cannot pack them with more power with the gaps.