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by agniusm
Feb 23 2022 4:26am
Forum: Battery Technology
Topic: The Barncat Battery- No weld/no solder
Replies: 93
Views: 2421

Re: The Barncat Battery- No weld/no solder

Hillhater- your inference here is that DIY lithium ion packs with literally hundreds of spot welds and dozens of tiny soldered wires connecting fragile circuit boards all contained in dubious insulation and questionable enclosures is 100% infallible. To put it charitably- that's not true. Nothing i...
by agniusm
Feb 15 2022 2:36pm
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

You could theoretically calibrate using a weight. Having a weight constant you could calculate kilogram force or newtons per given area
by agniusm
Feb 11 2022 2:40am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

APL wrote:
Feb 05 2022 1:57pm
What I need is a few dummy cells that have digital scale sensors inside to tell me what the load is. Otherwise, it's just trial and error.
For this i have used FSR402 sensor with arduino.
by agniusm
Feb 09 2022 9:00am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Anyone knows what happened with vruzend? I see all the threads are deleted/removed?
by agniusm
Jan 25 2022 12:40pm
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

I think the only way to know if all the cells are making good contact is to run a capacity test. If you discharge it until the first cell group hits cutoff, you can then measure all the cell group voltages at the BMS connections. If the measured capacity is close to expected, things are good. If yo...
by agniusm
Jan 21 2022 8:44am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

That is correct but it does not consider power requirements, therefore related to heat. So we said before we are forced to have higher capacity/storage to lower C output levels and reduce IR heat generation. If I want a smaller ~5-10kWh pack but capable of 5-10C peaks/short term output then cooling...
by agniusm
Jan 21 2022 7:14am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Yes, preventing heat from being generated internally in the first place, if practical is far far better than needing cooling solutions. Lower C-rates and capacity utilisation can extend also lifespan by 3x 5x or more drastically lowering annual running costs Of course, but the weight and volume are...
by agniusm
Jan 19 2022 11:19am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

Somehow missed the fact that I need a charger for this pack, focused on too many other things I guess. :? Looked around and found these guys that look OK,.. reviews seem good. 60v 3A for $60. Any enlightenments? Just don't want to buy a lemon. Yarlan 240w 60v charger.jpg I would look into meanwell ...
by agniusm
Jan 11 2022 3:09am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Tyler, its not viable to build a cooled pack out of NESE. I would not even consider such big packs as there are car batteries you could use for quiet cheaper. So for passive pack you would want to go with as many cells as is needed to keep the pack from overheating. Cells themselved dictate so NESE ...
by agniusm
Dec 27 2021 12:15pm
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Has anyone ever made a "bigger" Pack using these modules? I am planning a 20s16p pack and would like to use the nese system, I am not sure if they will be able to handle the current I will be needing though (200a continuous, 400a max) There are some big packs in the wild :) IMG_3649.JPEG
by agniusm
Dec 12 2021 2:58am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

I originally bought some of these last year because I was looking at the cost of these vs a kWeld, and the total cost would have been similar. I already had a 3d printer, and had bought 10kg of PETG for $100 a while back, so those were sunk costs. Each roll printed about 11-12 8p cases. I'm so glad...
by agniusm
Dec 11 2021 2:25am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Are there any good 26650's out there to use the 26650 kit with at this point? I always liked the idea of using big honkin' cells and think that this would be a great setup with them. Not many 26650 cells. There are few 4.2V cells but i have no idea how they perform. One of them is 15A Keeppower IMR...
by agniusm
Dec 11 2021 2:24am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

neptronix wrote:
Dec 10 2021 3:21pm
Are there any good 26650's out there to use the 26650 kit with at this point?

I always liked the idea of using big honkin' cells and think that this would be a great setup with them.
by agniusm
Nov 26 2021 9:00am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

tomjasz wrote:
Nov 25 2021 8:15pm
Cool. Time for another kit or two.
Do you have one built? How long and any photos you shared?
by agniusm
Nov 24 2021 2:59am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Starting 2021.12.01 until 2022.01.04
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by agniusm
Nov 24 2021 1:40am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

Exactly right. They were using a proprietary part with a PTC placed inside the disks on the PCB. That part is probably unobtainium. I'm wondering if anyone knows of an alternative disk-shaped part to create a contact to the PCB or other ideas to use a PCB as the connection. Lack of a PTC isn't a de...
by agniusm
Nov 20 2021 1:16pm
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Hi, looking into making my next battery using this design, but a few questions that I have not found an answer for: 1) On thingverse the 21700 module has a "normal" and a v2 design, what is the difference? 2) On your webpage when ordering the tabs, you can order "normal" and &qu...
by agniusm
Nov 20 2021 1:08pm
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

Your very labor intensive way of building a battery pack is a good reminder that spot welding is the best DIY way to go... :mrgreen: I have some customers who were welding before and after using my pressure system they commented -"never again i am going back to welding". Cut and burned fi...
by agniusm
Nov 19 2021 5:50am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

Wow, what a merry-go -round, solder tin, zinc tin, zinc plate, nickel plate, silver plate,.. I'm looking and thinking, better pack a lunch, this could take a while. :wink: Thanks for the link agniusm, I've been watching lots of videos and looking up info on tin, zinc, silver etc. processes and oxid...
by agniusm
Nov 18 2021 2:15pm
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

Hmmm, now that you say that, I wonder if I can just put it back in the dimple former and pound it flat too, solder is soft. I'll give it a try, and a little sandpaper too. I tried the silver brazing, and it works, but needs more trial. Want's to go everywhere and needs to be brazed upside down. Som...
by agniusm
Nov 12 2021 2:40am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

If you mean FR4 board, there is some difference but not much. PET-G is 1.23g/cm^3 vs 1.85g^cm3 phenolic infused glass fiber laminate.
by agniusm
Nov 10 2021 12:52pm
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 230
Views: 9290

Re: APL's Pressure Contact Battery box

@APL
Could you give me a favour and weigh your pack when finished along with final dimensions? I am curious how single compression battery is smaller and lighter vs my module equivalent. That would be fantastic.
Thanks in advance
by agniusm
Nov 09 2021 8:23am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Finished my demo 12v LiFePO4 battery. This is for UPS battery replacement. Smaller and with couple thousand cycles. Posting just to show how one can utilise pcb's with my modules to integrate bms systems. https://esk8-news-objects.s3.dualstack.us-east-1.amazonaws.com/uploads/original/3X/b/9/b9df36d0...
by agniusm
Nov 08 2021 10:42am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

john61ct wrote:
Nov 07 2021 1:14pm
Do you mean within the single module?

Or just series connecting modules together?
I see you post a lot, over 7 posts a day and share your expertise a lot.
Would you care to link me to some of your whatever builds you documented on ES?
by agniusm
Nov 07 2021 12:13pm
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 543
Views: 96058

Re: N.E.S.E. the no solder module

Series busbars are coming and will be available shortly, 1 to 2 weeks