Grantmac
10 kW
So it's not simply a question of scaling the holder?
Solderless weldless 36V and 74V batteries could do over 200A
- Thread starter agniusm
- Start date
agniusm
1 MW
Grantmac said:
No. The tabs that go inside are custom punched. Then foam die cut as well
PaulD
1 kW
agniusm said:
Looks promising, and good to see someone doing some bench testing here!
If I may, I'd recommend designing those bolted connections in such a way that the 3D printed plastic isn't between the nut and the busbar. Creep may be a problem, and it might loosen up.
Interested to see how it does long term. Maybe a resistance test as assembled, then after a few days/weeks would be prudent.
Matador
100 kW
- Joined
- Jun 29, 2016
- Messages
- 1,045
Must say that Agniusm's work look really solid !
Best solderless product i've see on the market.
I will eventually buy some when I can finally afford it (time will come)...
Agniusm are you an engineer ? I can't help but think you are looking how solid you know the specs of your designs...
Matador
Best solderless product i've see on the market.
I will eventually buy some when I can finally afford it (time will come)...
Agniusm are you an engineer ? I can't help but think you are looking how solid you know the specs of your designs...
Matador
agniusm
1 MW
Thanks.Matador said:
Sorry, but i dont know what you mean by last part
agniusm
1 MW
No issues with that so far. If the battery spec are kept to suit application, it should not be a problem. When i did test them on high draw, the case softened and became rubber like but the bolts stayed tight. I think its cause of some distance from the cells. Also the bolts are stainless and it is bad conductor of heat.PaulD said:agniusm said:
Looks promising, and good to see someone doing some bench testing here!
If I may, I'd recommend designing those bolted connections in such a way that the 3D printed plastic isn't between the nut and the busbar. Creep may be a problem, and it might loosen up.
Interested to see how it does long term. Maybe a resistance test as assembled, then after a few days/weeks would be prudent.
Dont know, but it just works, probably cauae its stupidly simple
agniusm
1 MW
Depending on what you need, i have couple 10S sets at 30% off. They are older iteration but work just as new. The new ones were updated with minor additions, like a notch to the lid for easier opening, chamfers etcMatador said:
I have a set of 6P and a set of 8P.
agniusm
1 MW
I have ordered couple PCM's. This one is 60A common port. Was initially thinking about installing separate port low power to drive a relay but this will do for the bike i have.
Finished battery with PCM installed:
Finished battery with PCM installed:
agniusm
1 MW
john61ct said:
According to the crowd, its bms but majority of the stuff people use is pcm, protection circuit module. It does balancing at hard preset value, does over current, under discharge and suposedly overcharge. Some does single or 2 point temp protection.
BMS from my point of view is a device with mcu on board an does more plus could be setup to desired values.
You can look up Daly waterproof pcm on ali or ebay.
This seems to be the Daly store on Ali https://m.aliexpress.com/store/activities/seller/storeHomeFromAms.htm?storeNo=4165007
Daly as a search string not great on eBay, and BMS works better than PCM.
Also carried by some Banggood sellers.
Best seems to be first get the model number.
______
To me BMS just means a collection of protective functionality, both cell-level and overall bank or sub-pack.
For the most critical functions there should be redundancy multiple layers. And yes, adjustable setpoints are for me a must.
Not all use cases require all possible levels of protection.
I've yet to see a reasonably priced all-in-one solution, and wish more were based on FOSS / open-hardware.
Thanks for the guidance, I'll check these out.
Daly as a search string not great on eBay, and BMS works better than PCM.
Also carried by some Banggood sellers.
Best seems to be first get the model number.
______
To me BMS just means a collection of protective functionality, both cell-level and overall bank or sub-pack.
For the most critical functions there should be redundancy multiple layers. And yes, adjustable setpoints are for me a must.
Not all use cases require all possible levels of protection.
I've yet to see a reasonably priced all-in-one solution, and wish more were based on FOSS / open-hardware.
Thanks for the guidance, I'll check these out.
agniusm
1 MW
I tend to agree to disagree :lol:
The good thing about PCM's is that its blunt as a boot so not too much that could go wrong with the hardware. I had one running for 7 years balancing and charging cells. I have destroyed that pack on vacation when my 43.8V charger died and i took 54V with me and my daughter(3) pluging it into the wall when we were leaving to the sea. I guess overvoltage protection did not work
But to get a good reliable BMS, forget going cheap. 150EUR is minimum before you start with addons.
The good thing about PCM's is that its blunt as a boot so not too much that could go wrong with the hardware. I had one running for 7 years balancing and charging cells. I have destroyed that pack on vacation when my 43.8V charger died and i took 54V with me and my daughter(3) pluging it into the wall when we were leaving to the sea. I guess overvoltage protection did not work
But to get a good reliable BMS, forget going cheap. 150EUR is minimum before you start with addons.
All I see in the Daly results are multi-port boards, what we usually call BMS.
I assumed you meant the per-cell modules, where each protects one cell?
Could you link to the specific one you ordered? Besides the current, what led you to choose it, as opposed to the others available?
And is there a per-cell module design you think is a good one?
Obviously, others can answer as well
I assumed you meant the per-cell modules, where each protects one cell?
Could you link to the specific one you ordered? Besides the current, what led you to choose it, as opposed to the others available?
And is there a per-cell module design you think is a good one?
Obviously, others can answer as well
agniusm
1 MW
Its not a bms, pcm, at least by my standards. I got that one cause its boxed and waterproof. I am making modules to accommodate these. I have an account on thingiverse where i will put all the cads so one could make brakets for specific bm/pcm boards. There are per cell modules, but they are compatible with different type of bms. Elithion, emus, these are couple i know.john61ct said:
These boards do not protect the cells. They have 2-3 wire communication with master unit and drain resistor, maybe led. Master unit controls charger. Think its called distributed bms.
agniusm
1 MW
Here is another battery. This one is 20S7P vtc6 inside. Wired with 25A pcm with separate port for charging.
999zip999
100 TW
That's what I need! ! But which frame will it fit ? That's always my problem. Size shape. Aginusm what size is that shape. ?
You say "that one", and I keep asking, "what one"? Please, can you link to it?agniusm said:
> These boards do not protect the cells. They have 2-3 wire communication with master unit and drain resistor, maybe led.
What not even HVC? only balance?
So link to the "master" as well?
agniusm
1 MW
Yes. They have communication to master unit. HVC is happening when its charging so master unit would switch off the charger then bleed high cells. All parameters are preset on master unit.john61ct said:
Here are some of the bms systems:
Decentralized master/slave:
https://emusbms.com/
http://elithion.com/
Centralized:
https://www.energusps.com/shop/product/tiny-bms-s516-150a-750a-36
https://www.electric-skateboard.builders/t/new-batch-6-12s-open-source-diebiems/52240
Centralized crappy bms:
https://www.aliexpress.com/item/48V-Smart-bluetooth-BMS-system-with-30A-discharge-current-for-54-6V-Battery-system-E-Bike/32733414980.html
PCM:
http://www.bestechpower.com/pcmbmspcbforli-ionli-polymerbatterypacks/
Even these chinese categize them as pcm or bms!
https://daly.aliexpress.com/store/4165007
agniusm
1 MW
999zip999 said:
371x88x152mm 1.5kwh
MJSfoto1956
10 kW
flippy said:
Somewhere I've got a cheap Bestech lying around -- anyone want it for target practice?
M
dequinox
10 kW
I'm really digging this design, and i can print my own cases thanks to your guide, but getting the metal tabs is the challenge. Are you able to sell just the 8p tabs in bulk? I can get the hardware (nuts, screws, etc) here in the USA, so i won't need the entire hardware kit. I didn't see tabs in bulk on your site. Maybe a pack of 24 8p tabs would be good for those of us making a 54v pack?
agniusm
1 MW
dequinox said:
Good stuff you can get them printed. You can get tabs here: http://18650.lt/index.php/product/n-e-s-e-tab-set/
Get 100 sets and i will get 10% off.
Thanks for digging
agniusm
1 MW
Can anyone check if i am alright with the battery. Its 20S7P vtc6 so 84V24AH. I have probably done 25km and its flat. I did go full speed most of the time which is around 70kmh with mixed terrain but nothing major
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