Some service promise from EV ASSEMBLE

[eva-michael]

Hello everyone,
Enclosure is Data of Spoke Lenght and Size of Bafang Motors.
This data is for all 16' 20' 24' 26' 28' 700C SWXH SWXK BPM
Just hope this can help all people to find out the spoke they need more easily.

Spoke Lenght and Size of Bafang Motors.pdf

(9.42 KiB) Downloaded 75 times

Spoke Lenght and Size of Bafang Motors
Mode Cross pattern Rim Size Length(mm) Spoke Size Length of Thread(mm) Diameter of a Spoke Hole（mm） Diameter of Rim
SWX01 Directly 16 89 12G 10 290
SWX01 2X 26 215 13G 10 572
SWXB Directly 16 80 12G 10 290
SWXB 2X 26 222 13G 10 572
SWXB 2X 28 252 13G 10 633
SWXK 2X 20 137 13G 10 3 418
SWXK 2X 24 202 13G 10 3 524
SWXK 1X 26 212 13G 10 3 572
SWXK 2X 26 225 13G 10 3 572
SWXK 2X 700C 256 13G 10 3 633
SWXK 2X 28 256 13G 10 3 633
SWXK 1X 28 242 13G 10 3 633
SWXH 2X 20 138 13G 10 3.2 418
SWXH 2X 24 204 13G 10 3.2 524
SWXH 2X 26 227 13G 10 3.2 572
SWXH 2X 700C 256 13G 10 3.2 633
SWXH 2X 28 256 13G 10 3.2 633
BPM Directly 16 60 12G 10 3.2 290
BPM 1X 18 96 12G 10 3.2 343
BPM 1X 20 112 12G/13G 10 3.2 418
BPM 2X 26 212 12G/13G 10 3.2 572
BPM 1X 26 193 12G/13G 10 3.2 572
BPM 2X 700C 241 12G/13G 10 3.2 633
BPM 1X 28 223 12G/13G 10 3.2 633
BPM 2X 28 241 12G/13G 10 3.2 633
PS. Right now we are still providing net bafang motors only. But we are arranging spoke and rim for our bafang motors.
Anyway Most important thing is to arrange the package for bafang motor kit to provide efficient package to the rim of the motor kit. Once we finish the package then all thing will be ok in next 1-2 days.

[jateureka]

QBPM motor hub is not symetrical, so should realy use 2 different spoke lengths to have the rim sit central when mounted in the bicycle frame. For example if mounting on a 24" Alex DX2418 rim with ERD of 487mm, the spoke length calculator indicates you should use 165 to 166mm long spokes on the left (disc side) and 167 to 168mm long spokes on the right for a single (1x) lacing pattern.

[eva-michael]

Yes and that's totally what we will do when assemble rim to them.
And there is a update file to show the difference.

[eva-michael]

Lipo is a option for ebike energy. As I saw some fire cases here and I will like to share a very simple point which may miss in these case.
Actually there are a lot of lipo packs which are using in ebike at our destination. But all of them are cased aluminum case or the little frog case. It's a very important way to avoid fire. It will isolate the lipo from large oxygen and outside. I will also advise to avoid lipo battery pack with pvc tubing or packed by any flammable material. Use ABS or PE material if you insist a tubing strture for lipo. They are flame retardant material.

[dogman]

Perhaps even more importantly, those examples have a bms that if functioning, will prevent the over discharging and over charging that often is the cause of a LiCo cell flaming.

Plus, of course, those are likely LiMn or LiFePO4 as well.

A hard box is always good, for preventing the other possible cause, physical damage.

Personally, I don't get it why people must store a volatile cemistry like LiCo attached to thier bikes. Mine is in use on the bike, and if not, it's stored in a safe place with some fire containment. I use ammo boxes with vents cut in them. The vents point into my fireplace. When experimenting with repurposing RC toy batteries for a larger ebike pack, it's good to treat them like they will burst into flames anytime.

[Jason27]

Wrong forum for selling stuff michael..

[Ypedal]

Wrong forum for selling stuff michael..

what he said.. moving thread

[eva-michael]

Wrong forum for selling stuff michael..

what he said.. moving thread

Nothing sells in this thread....Just share my experience and try to help people out from the issue of lipo..
We don't sell case

[Ypedal]

the picture YOU posted has your website on it...

rogue marketing tactics = fail.

[eva-michael]

the picture YOU posted has your website on it...

rogue marketing tactics = fail.

I just kind reminder at a point which may miss.....and copy a sample out by screenshot without too much handling of the picture....
a bit self-righteous.....................
Ok you are right then...

[Kin]

...Since when was ABS or PE flame retardent? Yeah, they're not wood, but I wouldn't call them flame retardent (but I might be clueless; I'm genuinely curious). I know there exist special FR abs, but I assume most ABS is not.


This just looks like spam, good call on the people who noticed the link. I think sometimes I question the gentle policy on rogue marketing like this, because ultimately having a posting here is likely to add some measure of legitimacy in the eyes search engine rankings. maybe it's just insignificant though, and no need to be very angry about it.

[Ypedal]

if someone wants to sell something.. go for it ( but post in the right place and be honest and upfront about it ) !.. by all means.. but posting shit under the radar is not cool and it happens way too much......

[eva-michael]

Perhaps even more importantly, those examples have a bms that if functioning, will prevent the over discharging and over charging that often is the cause of a LiCo cell flaming.

Plus, of course, those are likely LiMn or LiFePO4 as well.

A hard box is always good, for preventing the other possible cause, physical damage.

Personally, I don't get it why people must store a volatile cemistry like LiCo attached to thier bikes. Mine is in use on the bike, and if not, it's stored in a safe place with some fire containment. I use ammo boxes with vents cut in them. The vents point into my fireplace. When experimenting with repurposing RC toy batteries for a larger ebike pack, it's good to treat them like they will burst into flames anytime.

Yes. Safe is very important. Anyone who is fimiliar with some work of cells building will see they are really powerful thing....
Safe is also one of the critical point of the development of any big EV project over the world.
BYD is working on this point now if you notice recent news about BYI.

[oatnet]

But all of them are cased aluminum case or the little frog case. It's a very important way to avoid fire. It will isolate the lipo from large oxygen and outside. I will also advise to avoid lipo battery pack with pvc tubing or packed by any flammable material. Use ABS or PE material if you insist a tubing strture for lipo. They are flame retardant material.

You keep talking about preventing fires, when thermal runuaway is the issue. I don't think blocking external oxygen will help, and wouldn't ABS/PE melt in the extreme heat or explode from expanding pressure?

-JD

[dogman]

Yes. I just advocate hard shell, or at least more abrasion and puncture resistant battery protection for the prevention of punctures and other damage when the bike is crashed, or just knocked over.

So in that way, a box prevents fires. Don't puncture is in the rules for all chemistries. It matters little if oxygen is excluded, and ALL my battery boxes have substantial vents to let in cooling air to a bms, and to allow flamable gasses to escape if needed. No need to can a battery tight and turn it into a sealed container full of expanding gasses. Canned round cells usually still have a venting mechanisim, which may or may not let gasses out fast enough.

Shorts are another possible cause of fires, so it can be wise to protect some of the wiring on EV's with chafe resistant sleeves. Particularly where a battery wire exits a box, or may be vulnerablle on the route to the controller.

[dnmun]

this relates to the accident involving the chinese BYD electric taxi that was rear ended and burned badly, killing two occupants in back.

this was big news in china, nobody outside is familiar with the story. BYD stock dropped 6% at the open the day after this happened.

he is responding to that in promoting his concept of safety, the idea that by enclosing the battery in a metal case, it will protect the battery from the penetration of surrounding auto body parts.

so basically he is marketing to chinese concerns, and it doesn't make sense in the context everyone has viewed it from on this side of the lake. jmho

[eva-michael]

Yes. I just advocate hard shell, or at least more abrasion and puncture resistant battery protection for the prevention of punctures and other damage when the bike is crashed, or just knocked over.

So in that way, a box prevents fires. Don't puncture is in the rules for all chemistries. It matters little if oxygen is excluded, and ALL my battery boxes have substantial vents to let in cooling air to a bms, and to allow flamable gasses to escape if needed. No need to can a battery tight and turn it into a sealed container full of expanding gasses. Canned round cells usually still have a venting mechanisim, which may or may not let gasses out fast enough.

Shorts are another possible cause of fires, so it can be wise to protect some of the wiring on EV's with chafe resistant sleeves. Particularly where a battery wire exits a box, or may be vulnerablle on the route to the controller.

Yes I agree your point. Vents to let in cooling air to a bms and cells.
Welding position or connection points are also a very important cause. I have ever saw a video that a pouch lipo pack catch a fire and we found the burn were started from the melted connection.

[mr.electric]

I always look at automotive products to examine best safety practices. Take the example of a Prius battery.
Metal case
Bms
Mid pack fuse
Precharge circuit
Contractor on positive and negative lead
That stuff combined with plenty of testing and good software equals a safe pack.
Ebike packs are good when they are set up well. No bms or an exposed Bms and wiring is not very safe.
Look at the batteries on Panasonic ebike motor drives or a good quality cordless drill. You really have to work at it to even expose a wire or board to day light.
The thing that is missing for ES members is a safe pack that has a good discharge rate.
I would like to see a 5- 10c fully encased full bms pack that has been tested before it hits the market.

[eva-michael]

I always look at automotive products to examine best safety practices. Take the example of a Prius battery.
Metal case
Bms
Mid pack fuse
Precharge circuit
Contractor on positive and negative lead
That stuff combined with plenty of testing and good software equals a safe pack.
Ebike packs are good when they are set up well. No bms or an exposed Bms and wiring is not very safe.
Look at the batteries on Panasonic ebike motor drives or a good quality cordless drill. You really have to work at it to even expose a wire or board to day light.
The thing that is missing for ES members is a safe pack that has a good discharge rate.
I would like to see a 5- 10c fully encased full bms pack that has been tested before it hits the market.

For LiFepo4 battery pack, I think it's still very difficult to have a 5-10C without sacrifice of cycle life. Cycle life is key. EV will not be good vehicle without a good cycle life of battery. Considering cycle life issue, we always remind our diy clients not try to make high C rate LiFePO4 or they will lose money. Generally even headway and Thundersky(winston) will perform nicely and very good cycle life during 1-3C application.

[mr.electric]

The thing that is missing for ES members is a safe pack that has a good discharge rate.
I would like to see a 5- 10c fully encased full bms pack that has been tested before it hits the market.

For LiFepo4 battery pack, I think it's still very difficult to have a 5-10C without sacrifice of cycle life. Cycle life is key. EV will not be good vehicle without a good cycle life of battery. Considering cycle life issue, we always remind our diy clients not try to make high C rate LiFePO4 or they will lose money. Generally even headway and Thundersky(winston) will perform nicely and very good cycle life during 1-3C application.

Who said anything about Iron Phosphate?
The chemistry is a bit dated.
I like the good stuff.

[eva-michael]

Hello everyone ,
As an ev parts supplier, we provide good products to our clients over the world.
If you visit our online shop, you will find we provide our products in very low prices.
Even so, that's not the lowest prices if you are an old customers of us. Email me or my coleague when you want to order again. We will try our best to provide lower and lower prices regarless quantity once we become client relationship. It's a comprehension of each other and not restrictions
For example, we provide Headway 38120S 10ah LiFePO4 Cell -screw tab by 15.7usd with holder and connecting bar together which should be a very low price. And we can also provide them by 14.9usd/pcs for 200pcs or 2000ah order.
But for returned customers, we will always provide them with special prices to support their projects or careers.
Anyway. they's not the best we can do. visit us or email us and you will always find supprise and satisfaction.

http://www.evassemble.com
Email Michael: ev.assemble@gmail.com
Email Irene: evassemble.irene@gmail.com

Wish everyone a nice spring.
Best regards,
Michael