Search found 253 matches

by Joachim
Feb 28, 2018 4:09 pm
Forum: Battery Technology
Topic: 150A BMS "blown" at 110A during lab test. Video attached. What next?
Replies: 12
Views: 468

Re: 150A BMS "blown" at 110A during lab test. Video attached. What next?

16s 10Volt drop@110A discharge :? weak battery are poor serie connections?

The fets are more like 100A max i think?
by Joachim
Feb 27, 2018 1:38 am
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1545
Views: 338034

Re: Homemade Battery Packs

by Joachim
Feb 26, 2018 2:39 pm
Forum: Battery Technology
Topic: Panasonic pf cells rust/corrosion!!!??
Replies: 1
Views: 138

Panasonic pf cells rust/corrosion!!!??

I see almost on al the new cells from NKON Panasonic PF rust on the positieve. How is this posible on a real panasonic batterycell? a year ago i see this from the 2016 charge date....the 2017 also corrosion and when scratch on the part with a smal piece matal this turns in to red coller rust :shock:...
by Joachim
Feb 24, 2018 9:16 am
Forum: Battery Technology
Topic: greasy orange dirt
Replies: 7
Views: 251

Re: greasy orange dirt

overcharged lfp no bms?
by Joachim
Feb 22, 2018 3:36 pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 164
Views: 16344

Re: Spot Welding Copper Strips to 18650 Battery Cells

i have seen a compleet e-bike pack welded 2.5mm nickel platet copper so there are companys use copper for the battery packs. This is a Taiwan company. I will shoot pics of a pack and post here. The welds are not so strong like nickel..but oke.you can see they use more current to get good welds an al...
by Joachim
Feb 19, 2018 5:06 pm
Forum: Battery Technology
Topic: n00b BMS hookup question
Replies: 3
Views: 128

Re: n00b BMS hookup question

Nice pack :wink:
by Joachim
Feb 19, 2018 4:35 pm
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 20994

Re: Common pack design mistakes, how to avoid?

Headrc wrote:
Feb 19, 2018 9:36 am
Ok, thanks. I would still like to know what spot welder you are using.
i use cheap welder
by Joachim
Feb 19, 2018 1:40 am
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 20994

Re: Common pack design mistakes, how to avoid?

Headrc wrote:
Feb 18, 2018 10:16 am
Wow, nice build there. What spot welder are you using to weld copper?
not copper...0,20x8mm nickel for a part of the parallel connections.
by Joachim
Feb 19, 2018 1:35 am
Forum: Battery Technology
Topic: n00b BMS hookup question
Replies: 3
Views: 128

Re: n00b BMS hookup question

You can use the P- for charge and discharge...so P- wil be C-/P-
B- battery and the sense wires you can see easy on the literature.

can you see the awg wire size on the B- P-.....looks smal to me for a 100A bms?
by Joachim
Feb 18, 2018 2:58 am
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 20994

Re: Common pack design mistakes, how to avoid?

Test the pack low temps 5 degrees....@18 degrees wil perform better.
Peak 45A sag 0,6V and continuous 20A 0,2Volt sag.
No heat on the series after 15minuts wurks fine for me :D
by Joachim
Feb 18, 2018 2:43 am
Forum: Battery Technology
Topic: 18650 questions - How does internal resistance relate to voltage?
Replies: 11
Views: 308

Re: 18650 questions - How does internal resistance relate to voltage?

The average voltage while discharge a cell has influence on capacity. Low internal resistance while discharge wil result in a higher average voltage. Amp hours is not the correct way to measure energie,watthours is what you like to see. A 3000mah cell with a high IR has a lower average voltage 100% ...
by Joachim
Feb 16, 2018 12:19 pm
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 20994

Re: Common pack design mistakes, how to avoid?

The fuse&bms can handle max 80A.
I wil use this pack on a hobby motor-compressor that take maximum 45Amps.
by Joachim
Feb 13, 2018 9:58 am
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 20994

Re: Common pack design mistakes, how to avoid?

This pack good for 80A max discharge :?: 1mm pure copper wire for the series 6x
The pack:3s 28P 10.8V 81Ah 8AWG wiring no direct heat to the cells on soldering the copper serie/parallels :D
by Joachim
Feb 12, 2018 3:23 pm
Forum: Battery Technology
Topic: Need help on 18650 battery series/parallel plan
Replies: 10
Views: 321

Re: Need help on 18650 battery series/parallel plan

take a good look on a tesla module cell holders....these black china holders are to weak for a heavy pack :lol:
by Joachim
Feb 12, 2018 1:59 pm
Forum: Battery Technology
Topic: Need help on 18650 battery series/parallel plan
Replies: 10
Views: 321

Re: Need help on 18650 battery series/parallel plan

Nice wurk 8) these cellholders are the wurst thing i can see in the pack...
by Joachim
Jan 18, 2018 12:34 pm
Forum: Battery Technology
Topic: Battery problem, voltage but no current
Replies: 4
Views: 264

Re: Battery problem, voltage but no current

the bms doesnt like the current peak to charge the empty controller caps....a smal coil between battery and controller will wurk.
by Joachim
Jan 08, 2018 1:51 pm
Forum: Battery Technology
Topic: 36kwh battery porn VW 25Ah Sanyo cells+test
Replies: 8
Views: 625

Re: 36kwh battery porn EV project

Thx wurks well
by Joachim
Jan 08, 2018 7:49 am
Forum: Battery Technology
Topic: 36kwh battery porn VW 25Ah Sanyo cells+test
Replies: 8
Views: 625

Re: 36kwh battery porn EV project

Discharge the 7S 1P pack.
charge 4.2V cell.
End discharge 3.10V
Discharge Amps 13A continue
IR 14 Milliohm :lol:
Discharge time 2 hours.

Result:25.87Ah 666,47Wh for the 7S 1p pack so singel cell wil store 95.21Wh.

Results are perfect.
I wil post the discharge data sheet.....
by Joachim
Jan 07, 2018 4:57 am
Forum: Battery Technology
Topic: 36kwh battery porn VW 25Ah Sanyo cells+test
Replies: 8
Views: 625

Re: 36kwh battery porn EV project

Take them appart is easy,i dont have them for free :lol: I have to check al the modules for ballans and healty voltage first,the ones i already checkt are al 23.04V 6s 2p/3.83V for the 2p cells. Hope to get 23-24Ah out of the cells on a test,i can only test 7s 10s 13s battery.so 7S 25V 25Ah pack nex...
by Joachim
Jan 06, 2018 12:20 pm
Forum: Battery Technology
Topic: 36kwh battery porn VW 25Ah Sanyo cells+test
Replies: 8
Views: 625

36kwh battery porn VW 25Ah Sanyo cells+test

The last 6s 2p VW modules....these modules have a smal problem with the thermoswitch(nothing to do with the cells)on top of the black cover....so they want to destroy the modules :shock: happy to have them in my hands now so i can use them were they were bluid for. http://i68.tinypic.com/chxkz.jpg h...
by Joachim
Jan 03, 2018 8:04 am
Forum: EV Business World
Topic: Tesla-Hesla 1000km range????
Replies: 0
Views: 336

Tesla-Hesla 1000km range????

A Dutch guy/campany build a fuel cell in a model s tesla and he claims 1100km range :shock:
What do you think?real are just a good story.....100/150km more range?
http://www.thedrive.com/sheetmetal/1579 ... la-model-s
by Joachim
Jan 02, 2018 3:58 pm
Forum: Battery Technology
Topic: 35A BMS for a 10S4P 2900mAh-10A battery?
Replies: 22
Views: 653

Re: 35A BMS for a 10S4P 2900mAh-10A battery?

www.nkon.nl they have fresh PF cells in stock.40x for 110Euro...so 2.75 for a cell.
Also look for the positieve terminal protection papers and nickel strip...if you needs these,self welding the pack?
by Joachim
Jan 02, 2018 12:57 pm
Forum: Battery Technology
Topic: 35A BMS for a 10S4P 2900mAh-10A battery?
Replies: 22
Views: 653

Re: 35A BMS for a 10S4P 2900mAh-10A battery?

Just take the 10s 4p panasonic pf please and use the 35A bms....save for the cells/compleet pack and twice the rating of the controller amps.You can get a panasonic pf cell for 2.60Euro so 40 cells like 104Euro.I think this is cheap for these good cells. Lower 5 6A cells have more stress and higher ...
by Joachim
Jan 02, 2018 6:31 am
Forum: Battery Technology
Topic: 35A BMS for a 10S4P 2900mAh-10A battery?
Replies: 22
Views: 653

Re: 35A BMS for a 10S4P 2900mAh-10A battery?

4p lower 5A cells.....max discharge for the battery 20Amp,ooh sh#t the bms 35A :roll: i dont like these kind of batterie builds! After a year this pack hits the second hand market and someone thinks hey a nice cheap battery 35A bms and put the battery on a bike with a 30A controller :mrgreen: yes th...
by Joachim
Dec 28, 2017 11:58 am
Forum: Items for Sale - Used
Topic: tesla module EU
Replies: 21
Views: 2134

Re: tesla module EU

why 3 Euro for a secondhand nakked panasonic/Tesla 2800mah cell :?: