Search found 1383 matches

by Hummina Shadeeba
Jan 19, 2018 4:40 pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 158
Views: 12937

Re: Spot Welding Copper Strips to 18650 Battery Cells

I have some .14mm copper and it is weak but maybe that's actually a good thing. not saying necessarily and would depend on each instance but if the strip can bend then it isn't putting the strain on the welded connection to the cell
by Hummina Shadeeba
Jan 17, 2018 3:04 am
Forum: Stand-up E-scooters and E-skateboards
Topic: motor wires interfere with reciever?
Replies: 5
Views: 61

Re: motor wires interfere with reciever?

aren't the antennae kind of specific or fragile? can you simply extend the wire with another soldered on wire?

I thought I heard somewhere motor wires could interfere..any second opinions?
by Hummina Shadeeba
Jan 17, 2018 12:03 am
Forum: Stand-up E-scooters and E-skateboards
Topic: motor wires interfere with reciever?
Replies: 5
Views: 61

motor wires interfere with reciever?

will the motor wires interfere with my receiver antenna beside it?
by Hummina Shadeeba
Jan 17, 2018 12:02 am
Forum: Stand-up E-scooters and E-skateboards
Topic: Direct VESC V4.12
Replies: 15
Views: 1004

Re: Direct VESC V4.12

but he does post the guide and says its easy to do! I've never done it.
by Hummina Shadeeba
Jan 13, 2018 4:32 am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 158
Views: 12937

Re: Spot Welding Copper Strips to 18650 Battery Cells

it looks like the "boss level" welder has no trouble with .1mm copper strip and this guide, which seems more conservative than most, shows .1mm nickel x7mm strip doing 3amps comfortably, so with copper being 4 times as conductive couldn't I do a .1mm x 28MM FOLDED STRIP and that would net me 48 amps...
by Hummina Shadeeba
Jan 13, 2018 2:53 am
Forum: Battery Technology
Topic: Spot Welding Aluminium
Replies: 16
Views: 599

Re: Spot Welding Aluminium

adding another higher resistance material in a spot welding sandwich maybe creates the heat needed to do the most conductive materials: http://bbs.homeshopmachinist.net/thread ... pot-welded
by Hummina Shadeeba
Jan 07, 2018 7:30 pm
Forum: Battery Technology
Topic: DIY nickel-plating onto copper cell connections
Replies: 29
Views: 1821

Re: DIY nickel-plating onto copper cell connections

new info for me is that sodium benzotriazole is a good copper corrosion inhibitor. you can just dip the copper. haven't done it yet. electroplating is pretty damn fun though
by Hummina Shadeeba
Jan 03, 2018 1:55 pm
Forum: Battery Technology
Topic: trickle charging lithium
Replies: 3
Views: 162

Re: trickle charging lithium

thanks guys for the info and links above, there's a good one. The cells at 4.2 either on the charger or not makes no difference. makes sense.
by Hummina Shadeeba
Jan 02, 2018 11:32 pm
Forum: Battery Technology
Topic: trickle charging lithium
Replies: 3
Views: 162

trickle charging lithium

its said that trickle charging is not only bad for cells but even dangerous but what exactly would trickle charging be? When I bulk charge with a meanwell or some other constant voltage source and the pack is getting close to the supply voltage the amps going to the battery will go way down to a tri...
by Hummina Shadeeba
Dec 25, 2017 3:01 am
Forum: Battery Technology
Topic: 3D printed copper compression battery
Replies: 14
Views: 549

Re: 3D printed copper compression battery

I don't think heat will be a danger with any rubber: http://www.jjshort.com/Rubber-Properties.php I've got all these bands coming from amazon and now like the inner tubes idea best. crafty. I imagine cheaper. Faraday discovered Isobutylene or butyl. I don't think a tape would be as good because it s...
by Hummina Shadeeba
Dec 23, 2017 3:54 am
Forum: Battery Technology
Topic: 3D printed copper compression battery
Replies: 14
Views: 549

Re: 3D printed copper compression battery

I'm saying if youre using shrink wrap and a heat gun to get it on that's a very high heat which the rubber bands wont like
by Hummina Shadeeba
Dec 22, 2017 11:38 pm
Forum: Battery Technology
Topic: 3D printed copper compression battery
Replies: 14
Views: 549

Re: 3D printed copper compression battery

I think cooking the bands under shrink wrap could be possibly ruinous with the heat. epdm rubber bands seem the most robust and will use those. Each of theses packs of 4 rubber banded cells will probably be strapped down with Velcro by their center. they use 17mm copper strip .5mm thick ( 8.5mm2) wh...
by Hummina Shadeeba
Dec 20, 2017 7:13 pm
Forum: Battery Technology
Topic: 3D printed copper compression battery
Replies: 14
Views: 549

Re: 3D printed copper compression battery

The tape might not be the best material but I’ve got some super resilient rubber bands on route. I believe a band could for sure keep compression for a very long time. After so many miles with the bands I can take one off and compare its strength to a new one to see
by Hummina Shadeeba
Dec 19, 2017 5:26 pm
Forum: Battery Technology
Topic: 3D printed copper compression battery
Replies: 14
Views: 549

3D printed copper compression battery

how do you think it will go?! I will stack them and 6 long 12s. 4p. I can add more copper foil and plan to but now it's at a single thick .5mm with the dimples pressed in on an abs printed press. i'll go thinner on top since info on ES says it contours better for better connection. how to get compre...
by Hummina Shadeeba
Dec 19, 2017 12:22 pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1510
Views: 319801

Re: Homemade Battery Packs

how you think these will do? think it's .5mm copper strip but will do them with some very thin foil at the connections to contour better. can be stacked lengthwise or on top of each other with different copper strip that recesses better so nothing comes close when lengthwise or stacked. just 3d prin...
by Hummina Shadeeba
Dec 19, 2017 1:51 am
Forum: Battery Technology
Topic: 18650 battery Kit development and discussion[testing done]
Replies: 198
Views: 25434

Re: 18650 battery Kit development and discussion[testing done]

great thread and wanted to make something similar for a long time and finally did. another thread here.
by Hummina Shadeeba
Oct 26, 2017 2:22 pm
Forum: Items for Sale - New
Topic: 12s 2amp dumb shunt balance discharger pcb
Replies: 12
Views: 680

Re: 12s 2amp dumb shunt balance discharger pcb

So if cells are unbalanced depending on the charge rate it could be bad. Do u think it'd be possible to just add a larger resistor to increase current burned off?
by Hummina Shadeeba
Oct 25, 2017 12:44 pm
Forum: E-Bike General Discussion
Topic: how about this instead of a bms?
Replies: 7
Views: 400

Re: how about this instead of a bms?

aha. thank you. i'll monitor the cells and see. I've heard of people replacing the resistors so as to be able to discharge more. if cells are always balancing with this thing or a bms, and it's using resistors to drop the higher cell's voltage, then the energy storage would be only as good as the we...
by Hummina Shadeeba
Oct 25, 2017 12:18 pm
Forum: E-Bike General Discussion
Topic: how about this instead of a bms?
Replies: 7
Views: 400

Re: how about this instead of a bms?

and that's what I thought, that the current it could burn off while balancing would be too little, but people told me that if the cells were equally matched it wouldn't be an issue. Yea if the cells were way off or ended up way off then when getting towards full charge there could be a bum cell that...
by Hummina Shadeeba
Oct 25, 2017 10:53 am
Forum: E-Bike General Discussion
Topic: how about this instead of a bms?
Replies: 7
Views: 400

Re: how about this instead of a bms?

it will not protect against over-discharge but assuming it's working right it should protect against over-charge which is the real danger anyway, no? I got a couple of these and plan to use them. I will monitor cells periodically but unless someone can convince me this isn't safe enough it seems so ...
by Hummina Shadeeba
Oct 11, 2017 11:48 pm
Forum: Motor Technology
Topic: will silcone caulk stick to silicone motor wires?
Replies: 0
Views: 137

will silcone caulk stick to silicone motor wires?

looking for the thickest stuff available
by Hummina Shadeeba
Oct 06, 2017 12:36 am
Forum: Motor Technology
Topic: The State of Wye-Delta Switching
Replies: 24
Views: 5452

Re: The State of Wye-Delta Switching

maybe I'm using the simulator wrong but in these pics are a comparison of two systems: double voltage and half throttle double kv the load stays the same for both systems....why the different efficiency? same but kv.JPG double voltage half throttle.JPG the load stays the same and same rpm and but di...