Search found 380 matches

by thunderstorm80
Jan 04 2018 12:50am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

I've read about making a small puncture with a pin and squeezing the gas out, then seal the hole with epoxy. I can't recommend this, but most accounts are that this works. Having too much gas in the pouch will make it hard to get proper compression on the plates. I heard from Russian speaking frien...
by thunderstorm80
Jan 04 2018 12:43am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 2833

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

But you know the answer to your question ? The manufacturer said more 0.4C charge will reduce the cycle life....and you want to charge at 1C. So you can expect reduced cycle life....It wont destroy them, just reduce cycle life. ..But how important to you is a reduction in cycle life, compared to lo...
by thunderstorm80
Jan 04 2018 12:13am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

I've read about making a small puncture with a pin and squeezing the gas out, then seal the hole with epoxy. I can't recommend this, but most accounts are that this works. Having too much gas in the pouch will make it hard to get proper compression on the plates. I heard from Russian speaking frien...
by thunderstorm80
Jan 04 2018 12:08am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

In that case yeah most likely vibration and fretting. The best you can do is fix it firmly to the inside of the enclosure, and fix the enclosure firmly to the chassis of the vehicle. Last thing you want is a cell moving independently of the chassis, even if there's a layer of foam/rubber there to d...
by thunderstorm80
Jan 03 2018 2:29pm
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 2833

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

keep in mind that the higher rate you charge cells at, the harder it is on them. I know that, but that doesn't really answer my question... :| Most cells have standard charge rate and fast charge rate recommended by the manufacturer. I understand that for those Panasonic cells, the only guaranteed ...
by thunderstorm80
Jan 03 2018 12:04pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

With pouch cells of any persuasion, their biggest threat is physical trauma. Vibration, fretting, rubbing and puncture are real risks which need to be mitigated against. Unfortunately gaffa tape is not as good as a hard enclosure. The gassing happens when a cell is heated excessively - the electrol...
by thunderstorm80
Jan 03 2018 12:03pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

and there are a number of threads about a123 pouch cells, including termination and packaging, which might help you figure out a way to keep this from happening to any other cells. there are specific pressures that need to be applied to them, evenly across their faces (not the edges), which tape wo...
by thunderstorm80
Jan 03 2018 11:59am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 2833

Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

Hi, I am considering this battery: http://www.ebikes.ca/shop/electric-bicycle-parts/batteries/b5216-lim-dt.html I wanted to find more detailed specs about those cells, but the official ones are very, very shallow. For example, it writes only "standard" charge rate at 0.5C, and I am interested in: 1....
by thunderstorm80
Jan 02 2018 9:28pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

A123 20Ah prismatic cells got expanded - What can be done?

Hi, I use those cells on all my E-bikes. I wrap all of them into a battery pack using several layers of gopher tape, which proved very well for applying the required pressure upon the cells. (I apply pressure by hand when I wrap them, as they require to be pressurized a bit) Yesterday, I discovered ...
by thunderstorm80
Nov 04 2017 5:30am
Forum: Battery Technology
Topic: A123 prismatic cells - THE solution?
Replies: 65
Views: 7791

Re: A123 prismatic cells - THE solution?

To my knowledge, not a single vehicle OEM in the world is using A123 products today for an EV traction battery (I think a couple Chinese cars use them for start-stop ICE batteries today). A123 was unquestionably an industry leader when the M1 cell first emerged 11-12 years ago. While holding that t...
by thunderstorm80
Nov 03 2017 4:53pm
Forum: Battery Technology
Topic: A123 prismatic cells - THE solution?
Replies: 65
Views: 7791

Re: A123 prismatic cells - THE solution?

Some years ago the A123 M1A/M1B cells had been hyped for RC model usage because of theire robustness and the possibility for charging / discharging them at extreme high levels. I personally have used them too, but replaced them later by LiPos because of the much higher energy and power density. If ...
by thunderstorm80
Oct 25 2017 9:40am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1247
Views: 251618

Re: Compact Field Oriented Controller, ASI + Grin, limited r

My motor seems to keep going at low amp after applying the throttle. Once it spins up and i release the throttle i still see around 60W going in. I am controlling it with a CA and it shows throttle out voltage as 1.0. The minimum throttle i have on the controller is 1.10. I dont understand why my m...
by thunderstorm80
Oct 20 2017 1:11pm
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5664

Re: Using bicycle's frame as heatsink for the Phaserunner

Funny 21st century problem you got there. Straight round tubes made the best bicycle frames 100 years ago, and it's still true today. It's not very hard to thermally interface with one of those. Not when you have hydroforming geometry: The cross-section at any part of the frame along it's length is...
by thunderstorm80
Oct 20 2017 1:09pm
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5664

Re: Using bicycle's frame as heatsink for the Phaserunner

I'm not sure how much effort you want to put into this, but you can cast a formed heat sink in aluminum with not much more than some wax, a BBQ grill, some old beer cans. Simplified, the process would be something like: -cover the Phaserunner and frame with masking tape. Then tape the Phaserunner t...
by thunderstorm80
Oct 20 2017 1:07pm
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5664

Re: Using bicycle's frame as heatsink for the Phaserunner

"DIY phaserunner heat sink" (several examples shown) https://endless-sphere.com/forums/viewtopic.php?f=3&t=82196 For this one, I clamped two thick square-bars together and drilled-out the center with a hole-saw. I drilled from both ends towards the center, then separated them and halfmoon-filed the...
by thunderstorm80
Oct 20 2017 1:02pm
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5664

Re: Using bicycle's frame as heatsink for the Phaserunner

Drunkskunk's proposed solution of molding your own aluminum heatsink with a BBQ sounds so awesome!! Someday I will have to try that! But in general, How much of a win is it to add a heatsink to the Phaserunner? How much current draw from the battery do you need to make it worthwhile? For instance m...
by thunderstorm80
Oct 17 2017 1:53am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5664

Using bicycle's frame as heatsink for the Phaserunner

Hi, One of the great advantages of the Phaserunner is it's low weight, but when you add a big heat sink you kind of negate that. Especially when you have such a huge heat sink beneath your legs. (the bike frame) I would have liked to use the frame as a heatsink, but the frame is hydroformed - so it ...
by thunderstorm80
Oct 10 2017 3:34am
Forum: E-Bike Technical
Topic: Chain-ring PAS gets loose due to aluminium chainring. Help..
Replies: 0
Views: 257

Chain-ring PAS gets loose due to aluminium chainring. Help..

Hi, I use this chain-ring PAS, sold at Grin: http://www.ebikes.ca/shop/electric-bicycle-parts/torque-sensors/pas-12p-chr.html I have several E-bikes, and on those with steel bolts and steel chainrings it work fine, but on the third bike - the bolts are steel but the chainring is from aluminium. This...
by thunderstorm80
Oct 06 2017 12:02pm
Forum: E-Bike Technical
Topic: New 2017 updates to ebikes.ca motor simulator to try out
Replies: 70
Views: 27443

Re: New 2017 updates to ebikes.ca motor simulator to try out

FINALLY !!!!!! :D :D :D :D Thank you so much Justin! With the addition of torque-throttle and fully detailed custom-motor option, your Motor-Simulator is truly up to date! It seems you are eventually following (almost) all our suggestions. :P I know I sound "greedy" when saying this at this moment o...
by thunderstorm80
Oct 06 2017 7:34am
Forum: E-Bike Technical
Topic: Field-weakening on Phaserunner (Advanced question)
Replies: 0
Views: 392

Field-weakening on Phaserunner (Advanced question)

Hi, I use the Phaserunner's field weakening ability sometimes, and came into these two problems when planning my system's performance: 1. How can I calculate the expected delta-kV value vs increasing weakening current? (so I know how much my max torque potential on the given motor has declined while...
by thunderstorm80
Sep 24 2017 3:39am
Forum: E-Bike Technical
Topic: How to prevent punctures once and for all!
Replies: 35
Views: 3688

Re: How to prevent punctures once and for all!

Wait... So according to the stick-to-the-max-pressure approach, I understand that having a fat-Ebike with Surly blackfloyd's (2 6 x 3 . 8 ) so I can run them at 15PSI or lower is a very, very bad idea on roads? I have built that E-bike so I can carry luggage around town and when going long distance...
by thunderstorm80
Sep 23 2017 4:44pm
Forum: E-Bike Technical
Topic: How to prevent punctures once and for all!
Replies: 35
Views: 3688

Re: How to prevent punctures once and for all!

So you say - stick to the maximum pressure? On my E-bikes I use the minimum allowed pressure because it provides cushion and best-protects against vibrations which eventually loosen screws/nuts/or worse... After all, rolling resistance is less of an issue compared with pedal powered only bikes. (I ...
by thunderstorm80
Sep 23 2017 4:36pm
Forum: E-Bike Technical
Topic: How to prevent punctures once and for all!
Replies: 35
Views: 3688

Re: How to prevent punctures once and for all!

That's why one uses a plug kit designed for bicycle tires like the one I linked above. "Fix-A-Flat in cans does not work. But since the tubeless tire will already have sealant in it, after the hole is plugged, all that is needed is to air it up. From my experience, no sealant can plug damage from g...
by thunderstorm80
Sep 21 2017 9:02am
Forum: E-Bike Technical
Topic: How to prevent punctures once and for all!
Replies: 35
Views: 3688

Re: How to prevent punctures once and for all!

27.5 is the "new hotness", recreational/fad tire size. You won't find many utility tires in that size. But it's the same rim diameter as 650B or ISO 584 (another novelty wheel size), and you probably will be able to get a narrower tire with good puncture protection if your rims are less than 40mm w...
by thunderstorm80
Sep 20 2017 2:21pm
Forum: E-Bike Technical
Topic: How to prevent punctures once and for all!
Replies: 35
Views: 3688

Re: How to prevent punctures once and for all!

There are bicycle tire manufacturers that make tubeless ready rims. I think Dt Swiss has some. It won't prevent flats, but it's easier to patch a tubeless. Sent from my SM-G930F using Tapatalk Is it possible to use a "worm" patch for autos, to seal in realtime a leaking or completely deflated tube-...