Anyone buying these 305ah envision cells?

[42OhmsPA]

I just built a 16 cell, 48 volt battery for a friend. Found out that each box of 4 cells comes with an envelope with 3 bus bars and 8 nuts. Problem is you need 15 bus bars to build a 48 volt bank. I have extra bus bars but what if you don't?

Mine came with enough to make a 16s pack...

 

[#40Fan]

I'm not sure they make a beam scale for that small of torque. I use that 1/4" 30 inch lb torqmeter for setting up bearing preload on differentials.

That is exactly what I use mine for. Going to guess it goes up to 90 in. lbs. and is an older Craftsman.

 

[a619]

I just use a cheap bike torque driver I have for these small torque. I'm fairly certain it is not very accurate, but does the job.

 

[a619]

I just built a 16 cell, 48 volt battery for a friend. Found out that each box of 4 cells comes with an envelope with 3 bus bars and 8 nuts. Problem is you need 15 bus bars to build a 48 volt bank. I have extra bus bars but what if you don't?

My order from 18650 came with 1 busbar per cell.. Maybe ask them to send you the missing ones.

 

[Quattrohead]

!ucking hell,
Finally got the second BMS and built out my second EEL box........and snapped off 2 more cell studs.
Way below 6nm, you can just tell they are going.
PISSED OFF.

 

[42OhmsPA]

!ucking hell,
Finally got the second BMS and built out my second EEL box........and snapped off 2 more cell studs.
Way below 6nm, you can just tell they are going.
PISSED OFF.

I snugged mine up last night with a stubby 1/4" ratchet, I have to tighten the remaining 6 with a combination wrench since I didn't account for the terminals being under the supports on my rack.... (error code dumbass on my part)
One of them gave me a bad feeling with the ratchet but it snugged up fine.
I'll probably break 2 or 3 tonight...

 

[Brucey]

!ucking hell,
Finally got the second BMS and built out my second EEL box........and snapped off 2 more cell studs.
Way below 6nm, you can just tell they are going.
PISSED OFF.

I thought I read somewhere that 6nm was too much for aluminium terminals?

 

[42OhmsPA]

Everything except the main positive is tight. The 1/4" torque wrench stayed in the drawer the entire time with its bigger brothers or sisters.
I used the 1/4 stubby ratchet and stubby combination 10mm pictured, went back over everything with the wrench and gave it a final snug. I can see it now, breaking the main + when I finalize the wiring...

I also finished up my take on 'compression', I might modify it once I think of a better idea.
Edit - glad I looked at the photos, need to snug up 8 more screws.

 

[Quattrohead]

I called around a few places locally to see if anyone would try to weld the studs back, none would touch them.
I looked into aluminium welders on our favorite shopping site but I have not a clue to be honest and they seem to be $400 plus for a decent unit plus goggles etc.
So, I am going to try the MG Chemicals 8331D Silver Conductive Epoxy Adhesive and an M6 helicoil set.
Scrap the 8331D, bought a drill press instead. I could use one anyway.

 

[Surferdudemi]

I called around a few places locally to see if anyone would try to weld the studs back, none would touch them.
I looked into aluminium welders on our favorite shopping site but I have not a clue to be honest and they seem to be $400 plus for a decent unit plus goggles etc.
So, I am going to try the MG Chemicals 8331D Silver Conductive Epoxy Adhesive and an M6 helicoil set.
Scrap the 8331D, bought a drill press instead. I could use one anyway.

Is there a makerspace in your area that has welders? Ours has MIG, TIG, torch, and plasma cutter. Might be able to do it there or ask them to help you

 

[tjstepanian]

UPDATE
ordered 17 - 304aH grade B cells on Wednesday 11 Oct., received shipping order 3 hours later. Batteries not picked up by UPS upon checking this morning, Called James to check status, was told they were out of stock and received refund shortly after.
I was offered a deal on NEW 304 cells at $125 dollars each x 16 + shipping. I accepted the offer and purchased a JK BMS as well, everything shipped to the door for $2400.00. I hope these make it off the shipping dock. Will keep you posted.

UPDATE Wednesday 18 Oct.
Brand new cells arrived, appear to be in great condition, no swelling, all busbars accounted for as well as screws/nuts. I posted pics. Now for the Individual capacity test. More to come

 

[42OhmsPA]

UPDATE Wednesday 18 Oct.
Brand new cells arrived, appear to be in great condition, no swelling, all busbars accounted for as well as screws/nuts. I posted pics. Now for the Individual capacity test. More to come

Aren't those 280ah?
I'd strongly advise putting a 3/4"-1" hardwood board or some other substrate between the shelves and the cells... They will bow when loaded.

 

[houseofancients]

UPDATE Wednesday 18 Oct.
Brand new cells arrived, appear to be in great condition, no swelling, all busbars accounted for as well as screws/nuts. I posted pics. Now for the Individual capacity test. More to come

These are NOT envision cells

 

[tjstepanian]

Aren't those 280ah?
I'd strongly advise putting a 3/4"-1" hardwood board or some other substrate between the shelves and the cells... They will bow when loaded.

These are the EVE 304 Ah cells or at least that is what I'm purchasing, will let you know for sure after capacity test. I just cut some ply to place under the cells, thank you ! Also I will NOT be torquing the cells to 6 Nm but will go with 4 Nm torque

 

[tjstepanian]

These are NOT envision cells

Correct...they sold me the envisions but canceled due to lack of inventory. So, I bought the EVE 304 Ah cells at a great price...I hope

 

[houseofancients]

Correct...they sold me the envisions but canceled due to lack of inventory. So, I bought the EVE 304 Ah cells at a great price...I hope

Eve lf304's are good cells too..
Used to be my primairy, now the envisions a- grade are, but this far my eve's have never let me down

 

[JJJJ]

Eve lf304's are good cells too

Have a batch on the way. Looking forward to playing, ahem assembling them into the box I ordered.

 

[Bleedingblue]

!ucking hell,
Finally got the second BMS and built out my second EEL box........and snapped off 2 more cell studs.
Way below 6nm, you can just tell they are going.
PISSED OFF.

Your right I snapped off 1 while beginning the assembly of 1 of 4 strings of 16s. I was barely even tightening up on little past finger tight and a post snapped off.
I snapped off 2 more posts and I set my torque wrench to 5NM.
What I've seen is the laser welds are horrible on them




I also had some so bloated the bus bars wouldn't go on. After tightening even further on the compression and letting sit for a few days and tightening some more they were able to barely go on.

I've yet to complete 2 more 16s packs and fixing to do that now. But when using these cells great care is needed when messing with the posts due to the poor welds. These are definitely not Eve quality cells that I have. I'd rather have the threaded rod that you screw in than these by far

 

[Bleedingblue]

I thought I read somewhere that 6nm was too much for aluminium terminals?

I called and James told me 7nm

 

[Bleedingblue]

Here are 2 more cells. These were tightened up at 6 NM. I have since dropped to 5.

Just poor welds

 

[Quattrohead]

Yes they have shit welds.
I have the stuff to try and tap studs into them, wish me luck.

 

[Bleedingblue]

Yes they have shit welds.
I have the stuff to try and tap studs into them, wish me luck.

How far are you drilling down?

 

[Quattrohead]

It seems from my interwebs sleuthing that 6 mm is the maximum you want to go to.

 

[Bleedingblue]

It seems from my interwebs sleuthing that 6 mm is the maximum you want to go to.

Seems like I remember reading on here a long time ago that someone drilled out a hole and threaded one.
I have some that come with threaded holes and you put in a threaded rod in it. Those were about 3 years ago

 

[Bleedingblue]

I finished up the rest of the packs using 4 nm none of the rest of em broke off