Finally - 48v 21700 Cell modules

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[ronghengtai]

👍👍👍Your hands-on ability is very strong and your technology is great. I need to tell you and everyone that I am the designer of this 21700 battery holder. I tell you very seriously that the positive electrode must be installed first when installing the battery in this battery holder. Then press down the negative pole. When removing the battery, you must first remove it from the negative pole. If possible, it is best to put a colored cloth strip under the negative pole of the battery when installing the battery, so that you can disassemble the battery more easily. Good luck to everyone.👍👍👍👍👍👍👍👍👍👍

[Beakerzor]

wow, I'm impressed, having followed you for years, at how easy you've made everything for the DIY home hobbyist - thank you for your years of work

[nloggraficas]

After the math its way too expensive $970 plus shipping of all those parts plus taxes plus any miscellaneous expenses for just 1 battery of 25 ah, if you want 2 set would reach $1300; with $200 more id rather buy a EG4 $1500 100ah 5.12kw/h fully assambled and guaranteed

[shadowmoon]

Love your video's... You should consider the same concept but using 18650's, Would love to see a build PCB for 48v for those.

[MattWells]

When adding the heatshrink to the battery, I use a small round magnet that is about 1mm on a metal serface and place the negative end of the battery on the magnet. This stops it from rolling around when blowing it with hot air and gives a consistent wrap around the bottom of the heatshring.

[charlestatakis]

Wow, amazing update. Jehu, I continue to be impressed with your direct plausible approach we can all follow. I'm always totally comfortable with what you bring to battery configurations and charging. Watching you with total confidence is a stressfree approach for many of us.

[seymourpro]

Consider taking the power connectors to diagonal corners of the battery to ensure that all the assemblies charge and discharge evenly. Using the top corners means that the top assembly charges and discharges more than the others simply for the minute difference in the resistance of the posts.
Could you make an assembly matching cable with say 10 ohms between each connector so that power sharing on initial contact is moderated? -Not everyone gets a box of perfectly matched cells. First assembly gets the resistor link, final assembly gets a zero ohm wire.

[fouroakfarm]

12V 100Ah LiFe batteries are as low as $350 now. And cheaper if you buy cells and DIY. These would be good for a mobile application where weight matters but they don't seem cost competitive for stationary storage

[EngineeredMojo]

You inspire me to start exploring battery power

[pishta]

careful putting these naked batteries in holder type chargers. They (18650) can arc easily when you slide the positive end into the contact as it usually hits the negative edge first then the positive button, POW! I now insert the positive end first and an angle them let the negative end slide in.

[waynegabler]

The e-bike thingy. People converting from sla batteries have cases from either 12v 10-14ah or 12v 18-22 that should be filled with cells and then put back into the bike. 3.2v x 4s =12.8v which is perfect.
Rather than use new cells there are lots of used 3.7v cells that are 20% below capacity but available 'dirt cheap'. Powering bikes also gives those cells a 2nd life.
Those little packs that are 48V should power any 48V bike, a box that 4 batteries came out of (7x3x7) could hold even more cells.
Most riders only go 16mi or less so having 1 hour ride time would work and their batteries can be charged a few 1, 000 times. That being said, there are times when 4hrs would be better than having to charge.
Based on that info and the same 500watt motor being used what is the lowers mah I can have for the various bikes 48v, 60v, 72v, 84v (Daymak makes bluetooth controllers for all those so the specs would help as far as controller voltages). The motor can take more voltage of cooling is increased.

Now that I have 48v - 84v using 12v 'cells' is there a bms that would to keep the charge level to the same even though the batteries are slightly different. More than once I have 1 sla battery go flat, that is a lot of work to repair and replacing the whole set is 'needlessly expensive'.

[Xeroof]

12:37 Another think you can do is spread some polyurethane over the contacts. It acts as an insulator, but it can be worn through, so you have to be careful, but it does make the boards safer, which is what you'll need given the power you've got packed in there. It'll also help the longevity of the boards by helping prevent corrosion and wear from weather.

[gemrough]

Yea price is way too high! I still have several boxes of Model 3 20700’s I bought… they build awesome packs!

[hamprepph]

I've had a great idea just popped up in my mind and I found your channel. Think of having many Dewalt batteries, building a power bank without extracting the cells inside, and still using it with your portable drills! Hope you'll find this comment!

[ejonesss]

i think at 36 volts is where they consider the battery to be high voltage.

in electric cars all high voltage wiring is orange so if the car is in an accident the first responders especially the ones running the jaws of life because at like 400 volts there can be lots of sparks and vaporize metal and even fire.

[LimbaZero]

for design point of view I think I would have used angled fuse holders that you don't need to disassembly pack when changing fuse

[coldrider]

Thanks for all your help, QUESTION; When you say cell and packs (parallel ) of cells must be at the same voltage, to what decimal point do they have to be the same 0.1-0.01-0.001v . Or in another way how close to one another is ok or is too far apart ? assembling parallel packs 1st, cell with small differences will self balance what is the time to wait for that to be completed ?

[James-hbqu]

The engineer in me, of course, starts thinking of what can go wrong. Those are fairly inexpensive battery holders so if corrosion develops on the contacts and causes a voltage drop across them will the design fail safe or cause a problem? I don't know enough about the battery controller to know if this would be a issue and how the controller would respond to it.

[buzzofftoxicblog]

👏brilliant I see this is education knowledge is power 🔋

[dreamkissu]

did you ad the link to the 48v bms you talked about that is budget friendly for it?