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Electric Unicycle's BMS problem and solution


hobby16

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That wheeler had shunted his SML and after two months of happy ride (without power cut, off course) had a mainboard fire (not a battery fire) : http://trottinetteselectriques.heberg-forum.fr/sutra21598_solution-probleme-bms.html#21598

Circumstances exclude that the cause comes from the BMS :

- the fire happend after a violent braking causing an overvoltage, killing the driver stage, provoquing a "shootthrough" in a half-brige and killing the mosfets.

- the SML is notorious for having a crappy mainboard, if there is a video showing how to change the mainboard, there must be some reason

I have no other feedback of a fire on a shunted wheel as of now. Even if there are other case, I'll keep all the shunt on my wheels, for obvious reasons. Rider security first.

I was kidding.

What I meant, that a fire can happen, wether the wheel is shunted or not.

thank you ? @hobby16  will keep you updated 

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Většina jednokolky používat BMS jízdních kol ", který má k přílišnému vybití cut-off obvod (Q1), aby nedošlo k vybití akumulátoru pod LiIon doporučila napětí. Je to funkce užitečné pro baterie off-the-police jízdní kola ", ale pro monocyklů, je to
1) unecessary od základní desky se zabývá docela dobře se varování napětí
2) naprosto neuvěřitelně hloupý protože cutoff na základě výsledků BMS v faceplant pro jezdce. Jinými slovy, návrhář volantem se preferuje chránit baterii poškozuje uživatele !!! Mnoho mnoho uživatelů byli poškozeni, zvláště když kolo je studený (pod 10 ° C), protože roste vnitřní odpor baterie "a spustí cut-off snadněji.
Samozřejmě, že ne všechna kola jsou ovlivněny tímto neuvěřitelně hloupým "funkce ". Pokud vím, Solowheel, Ninebot, inMotion, tj renomovaných značek nejsou oříznuty. Gotway má rané verze, že cut-off, ale jeho nedávné BMSS nemají, protože cut-off obvod byl odstraněn.
Všichni ostatní dělat, není-li prokázán opak. Tak oni jsou nebezpečné, protože pravděpodobnost, cut-off se bude zvyšovat s chladným počasím přichází a vyšší vnitřní odpor v důsledku přirozeného stárnutí baterie.

Pro potenciální kupující jednokolka, trvají na tom, že mají bezpečné BMS, tedy bez cut-off. S dostatkem tlakem od uživatelů, bude Shenzen geniální skončit opravovat tento hrozný omyl.

Pro ty, přilepená s nebezpečným kolečkem, BMS cut-off obvod MUSÍ být odsunul. Při dotyku akumulátoru, jestli se můžete cítit pod balící fólie filmu velké MOSFET tranzistory, znamená to, že BMS musí být odsunul.

Cílem je propojit baterie 0V (B-), přímo k výkonu (P-), obcházet MOSFETs T1 odpovědný za stupidní cutoffu: viz tečkované zelenou linku v níže uvedených schémat. (B-) a (P-), je nyní standardní značení na většině BMS deskách, takže jakýkoli BMS může být modifikována laici založené na tomto principu.

bms_schematics_english.png

Můžete okamžitě vidět zlepšení testováním kolo se silnými zrychlením, nic víc cut-off, nikdy!
Užijte a mají bezpečnou jízdu.
Níže jsou uvedeny některé příklady BMS zkrat. Některé poznámky:
- není třeba odpojit baterii při provozu
- pro Airwheels, pouze odmontujte poloviny bydlení na straně baterie (strana bez ovládacího panelu).
- T1 se obvykle skládá ze 2 nebo 3 nebo i více Mosfets , takže to je příznačný od X1 obvykle z jediného mosfet.
- Na rozložení Nejvíce tabule ', T1 je označen jako Q1, X1 je označen jako Q2

 

PS pro další obrázky a fotografie zdroj cti modders, viz můj původní vlákno zde: http://trottinetteselectriques.heberg-forum.fr/sutra13862_solution-probleme-bms.html#13862

 

TG BMS. T1 tranzistory lze cítit přes plastovém obalu.
dscn1483.jpg

Plast je scapeled okolo T1. T1 je vyroben z 3 paralelními tranzistorů MOSFET.
dscn1484.jpg
dscn1488.jpg

MOSFET mozků a zdrojové kolíky jsou paralelně zapojeny s pájecí klubíčko. Varování, vyhnout se posunu X1 MOSFET.
dscn1490.jpg
dscn1491-3bis.jpg

Plastový se uzavře elektrikář páskou. Menší otvor může být, moje je unecessarily velký.
dscn1492.jpg
dscn1493.jpg

 

TG BMS, s CMS MOSFET
image1.png


Dolphin D5 BMS. 3 mostfets T1 se odsunul. X1 na krajní pravici NENÍ odsunul. T1 a X1 jsou detekovány měřením MOSFET "brány napětí (pin 1): paralled MOSFETy mají stejnou brány napětí ..
image5.jpg

Airwheel X8 BMS. T1 a X1 nejsou snadno rozlišitelné. Pokud si nejste jisti, derivační dvou prostředních MOSFETy.
20150318-151508.jpg
20150318-152108.jpg


Poslední verze Gotway BMS: ne T1 okruh => žádný zkrat dělat. Je to bezpečné BMS.
13803322_small.jpg


Aliexpress generic baterie BMS (Q1 = T1, Q2 = X1)
img-7297.jpg

Další Airwheel BMS, napěťovou přímo B- namísto P- posunovacích MOSFETs
b0.jpg

Další obecný kolo BMS. Zkrat B- P-

bms_generic.jpg

 

SML160 BMS. Neobtěžujte se odklání MOSFETy. Zkrat B- místo toho P-.
sml160-bms.jpg

Firewheel BMS. B- odložený P- o velkou drátem. Trasa drát jako na obrázku, aby se zabránilo přidání tloušťku na baterii. Všimněte si, že zde B- drát je červená místo obvyklého černého barevného kódu pro záporný pól, výskyt nedostatkem péče (jiné Firewheel BMSS mají správnou barvu, tj black), což může být velmi zavádějící.
DSCN1651_shunt.jpg
2015-05-30-15-05-13.jpg
2015-05-30-15-11-09.jpg

Upravit 2015/05/25: Q1 & Q2 jsou nejednoznačné, nahrazeny T1 & X1

Excellent article, thank you for my health, I had all the wounded

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Tried my wheel yesterday and today with my partner as I got the new one today.. 

I think that the one I shunted is working properly, but still need to try it more to confirm.  The only thing I saw as negative is that comparing it with the new one ( the same model), the battery last less.. I mean that the first light of battery goes quicker then the other one.. Went to ride with my partner and the other one went to 3 lights and mine to 2.. What do u guys think?  

@hobby16 @vee73 

DSC_3394.JPG

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Tried my wheel yesterday and today with my partner as I got the new one today.. 

I think that the one I shunted is working properly, but still need to try it more to confirm.  The only thing I saw as negative is that comparing it with the new one ( the same model), the battery last less.. I mean that the first light of battery goes quicker then the other one.. Went to ride with my partner and the other one went to 3 lights and mine to 2.. What do u guys think?  

@hobby16 @vee73 

 

Do you and your partner have a big difference in weight - this could make a big difference for the battery usage, especially going uphill. Or the one of you drove much "wilder" ?

Most probably one/some battery cell(s) of your first wheel are bad/not so good - would also explain some symptoms of it you posted.

Edit: the difference has for sure nothing to do wirh the shunting - just in case you should worry about this. And with driving some distance with it, everything should be ok...

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Do you and your partner have a big difference in weight - this could make a big difference for the battery usage, especially going uphill. Or the one of you drove much "wilder" ?

Most probably one/some battery cell(s) of your first wheel are bad/not so good - would also explain some symptoms of it you posted.

Edit: the difference has for sure nothing to do wirh the shunting - just in case you should worry about this. And with driving some distance with it, everything should be ok...

she is 58 kg and im 60 kg so i guess that is not the problem..  It might be that some cells are bad...

If i change thebattery, can i put a stronger one to get as well more range? @Chriull @Gimlet. Thanks for your help guys ? 

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 What do u guys think? 

I think that if I can have a second wheel for free like you, I'll pray to have a defective battery. :P

Just kidding.

Maybe it's too soon to know about your old battery health.

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I think that if I can have a second wheel for free like you, I'll pray to have a defective battery. :P

Just kidding.

Maybe it's too soon to know about your old battery health.

awww that's is true lol.

Let's see how it goes... But that the battery goes down that quickly is not very normal..  @hobby16

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A new battery typically needs a few cycle that is able to give its full performance.
The tire air pressure is also affected.
But the battery may be defective, or a single cell.

think that I will get a new battery as yesterday used again both wheels for the same distance and the new one has still 3 lights of battery and the other one only 1!!!! @vee73 the tire air if fine I have checked it..

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Oh no. I suspect a defective battery. Too bad. You should contact your dealer.

he already sent me a replacement..  and let me keep the defective one.. So should i buy the battery from him or can i buy it from someone else and as well buy a stronger one? @vee73

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Yes, you can if the battery case has enough space. Often there is insufficient space for a bigger battery. You should be accurately measured.

would it not affect the mainboard right? Will buy one and measure the space available..  @vee73 Thanks so much 

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would it not affect the mainboard right?

No, those wheels are X3 clones,  they all use the same battery with 16 cells in series so, mainboard, battery, all are interchangeable.

If you buy up to 170Wh capacity (should cost about $100), there won't be any space problem since they use 18650 cylindrical cells.

With higher capacities, like 340Wh, you'll have 32 cells instead of 16 and the pack won't fit in your Weerda, forget it.

Up to 170 Wh.

If you love your lady, shunt the BMS. Don't shunt if you want her to go away. :P

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No, those wheels are X3 clones,  they all use the same battery with 16 cells in series so, mainboard, battery, all are interchangeable.

If you buy up to 170Wh capacity (should cost about $100), there won't be any space problem since they use 18650 cylindrical cells.

With higher capacities, like 340Wh, you'll have 32 cells instead of 16 and the pack won't fit in your Weerda, forget it.

Up to 170 Wh.

If you love your lady, shunt the BMS. Don't shunt if you want her to go away. :P

thank you ? aww love her so now I'm worried lol @hobby16

 

 

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PLEASE HELP ME

 

i i have the same wheel as the blue battery one in the pictures got my mate to do the soldering and now my wheel wont charge?

what have i done? what can i do? 

 

the end result looks spot on and the wheel is working a dream but now it just wont charge 

i only did 2 out of the 3 just like the pic! please help

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PLEASE HELP ME

 

i i have the same wheel as the blue battery one in the pictures got my mate to do the soldering and now my wheel wont charge?

what have i done? what can i do? 

 

the end result looks spot on and the wheel is working a dream but now it just wont charge 

i only did 2 out of the 3 just like the pic! please help

can you post a pic of the work?

and just to be sure - the plug with the charging wires of the battery pack is plugged in?

Maybe you just "destroyed" a cable putting it together?

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This sounds exactly what happened to me twice on my Airwheel X8.

First time I still had 1 bar of battery (according to the Airwheel).  I turned it on, waited for it to level itself and I hopped on it and leaned forward in a VERY aggressive manner as to accelerate as quickly as possible.  The X8 fell straight forward and I took a really nice spill.  Was more embarrassing than anything.. but I did get a few scratches.  I thought maybe it was just low on battery.

The second time was at full charge and was riding full speed on the flat.  I then was transitioning up an incline when again, the X8 fell face forward.  Since the second time, I am now worried while riding it. 

I will try the modifications listed.  Am at work so I cannot see any pictures, hopefully I will see them better when I get home.

Will report back with results.

This sounds exactly what happened to me twice on my Airwheel X8.

First time I still had 1 bar of battery (according to the Airwheel).  I turned it on, waited for it to level itself and I hopped on it and leaned forward in a VERY aggressive manner as to accelerate as quickly as possible.  The X8 fell straight forward and I took a really nice spill.  Was more embarrassing than anything.. but I did get a few scratches.  I thought maybe it was just low on battery.

The second time was at full charge and was riding full speed on the flat.  I then was transitioning up an incline when again, the X8 fell face forward.  Since the second time, I am now worried while riding it. 

I will try the modifications listed.  Am at work so I cannot see any pictures, hopefully I will see them better when I get home.

Will report back with results.

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I have a Ninebot and never have experimented a BMS problem, but I have read many post of people with another EUCs suffering a faceplant because BMS triggered the "safety" cut-off.

I do not know any reason to cut-off power to an euc, since its needed to protect the rider against a crash.

Can you think in hard braking a car by a very steep downhill, and the software in the car, to protect the brake disc against destruction because the temperature, decides to disengage the brakes temporarily?

Even in the case of this safety feature for the batteries is good for the rider as well, because a fire in the euc will be dangerous, I think that it is a comparison between very low probability (fire) and certainty (faceplant).

So IMHO the best it would be a well designed BMS, with no cut-off at all, but alerting the mainboard (through control data line or so) to reduce gradually speed (not power) and vibrate or whatever would be necesary to alert the rider too of this event, in order to stop the euc with safety in mind.

I said speed and not power, because if you are in a downhill may be will be necesary to increment power in order to reduce the speed (I am not sure).

Meanwhile, if I have a euc with a bad designed BMS, I shunt it for sure. Just my opinion.

 

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Hi guys. If anyone can help I'd much appreciate it. My Airwheel X3 or X8 knockoff "ThE Wheel" started running slow and dying whenever I push it too hard. I dropped me a few times going uphill.

Since I have to plug it before it turns on again I thought shunting the BMS would help, so I did. But it keeps shutting off. 

Did I do it wrong? (see picture) Or do you guys think it's a different problem?

 

Thanks guys! I really appreciate it.

IMG_20150801_134636_marked.jpg

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I wonder why you have done something without someone to make sure what you're doing? You have done wrong, I know. But I'm not totally 100% sure which of those three need to be soldered. But rest assured that the produce is what you have already done.
Remember now, dear people that does not mess around with batteries. One mistake can be very serious and it can burn throughout the apartment easily.

@hobby16 is the only one who can fully ensure that what needs to be done.

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