Warning: EBike battery in flames!

[Green Machine]

Holy shit that is really scary....

 

[liveforphysics]

Nothing in this video would help, or is even a good ideal to be doing with can cells. Soldering cans like you've done means any of them could now have thermally induced latent defects to fail catastrophically at some later point.

i was not talking about the soldering

i was talking about how 1 weak cell almost burnt his system down and it would have if he had not put fuses on each cell

and the next one or 2 vids he shows what happens if a bunch of cells with charge in them are hooked up with a bad cell it almost caught on fire it got hot enough to scorch paper

this is where cell level fuses are really needed

Unless you've got a crystal ball, you can't know if cell level fuses would have any effect on causality, or if they would experience a current difference which would make them open. It can help with a limited range of effects, one if the greatest being behavior in a catastrophic structure displacement event like a vehicle crash/impact.

 

[Adverse Effects]

in 1 of his vids you see the cell level fuse on the bad cell blew 2 times(1st time he thought it was his mistake when manufacturing the pack) and that is the only reason he looked deeper in to the problem and that is the only reason he found the bad cell that if it didnt have a fuse would have melted down and taken the full pack out in a ball of flames

 

[Rube]

Thanks for posting, it takes guts to expose such a disappointing event. Be happy that the photos alone will inform people. BTW I'm glad you're OK.

 

[Gregory]

You sure the battery on fire is belong to BatteryBuilding?

That would sound more convincing if you hadn't just signed up 30 minutes ago.

 

[Tor]

Representative commenting "under cover" on this forum - that's funny :lol:
Nice try - but you underestimate people on this forum 8)

 

[tomjasz]

You sure the battery on fire is belong to BatteryBuilding? I noticed that you mentioned your batteries are lack of capacity, so you must tested some of them, can you show us the battery testing report?

Shill! To funny, instantly caught and revealed!

 

[Tor]

Low quality batteries can be dangerous!
Thanks guys - for spreading this information.
In my case - no one were injured and the house did not burn down - luckily

 

[Wisser Stec]

Here attach photos of the inner dolphin battery and the inner BMS

 

[Gregory]

“I'm same as you as customers,

Buddy, both of those photos look like they came from the company, not a customer.
One of them is a battery still being built, it's just a mock up by the manufacturer. There's no wiring.
Are you trying to prove you are working for SHENZHEN BB?

 

[amberwolf]

Account removals had nothing to do with hiding anything, only with breaking of rules.

The previous accounts from the actual company were all removed because there have been multiple accounts created by and for this company, all at the same time, when only one is needed. This is frequently used for spamming, among other things, so it isn't allowed.

The this immediately previous account and that multiple IPs were used from completely differnet parts of the world for the posts of the last account, while claiming to be from yet another part of the world, and the continous "name dropping" (SEO tactics, used by spammers and companies for advertising).

Even this new account was ALSO created when the previous account was; you did not "have to make a new account" to repost your stuff--you'd already broken the rules by creating multiple accounts.

If this new account that claims to be from Germany is actually for a company other than the chinese company, you need to list your company credentials so they can be verified, otherwise we will assume it is yet another account from the original company itself, and will also be removed.

If other accounts are found to be from your company then all of them including this one will also be removed, and so will all future accounts from you.

 

[Tor]

Amazing job from Endless-sphere stopping the multiple propaganda attempts from this Chinese player in this thread - THANKS

Don't buy low quality batteries - play safe

 

[tomjasz]

News flash, batteries from quality maker can go bad a you can have a fire. One today. Battery wasn't charging, suspected the charger. Charged for several hours with known good charger. When taken off charger, "seemed warmer than usual, but not hot." Two hours later an explosion and a completely burned up Dolphin with high quality cells.

Scary.

 

[docw009]

Comment Deleted

 

[999zip999]

Sorry you are very lucky. I had a battery fire in the garage. Melted carbon fiber fishing poles and snow skis. Sad. I now use lifepo4 heavy but safe. Hard to find high quality lifepo4 for good price.

 

[TheBeastie]

The battery suddenly caught fire after a few minutes riding

I bought this 52V 14Ah Dolphin ebike battery from BOB Shenzhen BatteryBuilding Industry Co

No signs of damage or heating before it happened. Normally such fires are due to short circuit within the battery.
However, the battery only delivered 9,5Ah and not the 14Ah as promised - I have a couple of triangle batteries from China and they are also far below the promised capacity.

I don't want to risk any lives or my house - so my next battery will come from someone with a reputation for quality and customer service. I guess Lunacycle.com and em3ev.com are solid?

Wow..
Not trying to blame anyone but I been thinking that a good number of segway fires have always hard alarmingly large heavy people riding them before they went (instead of a child or a skinny chinese man) and thus I have wondered how many of these 18650 fires are just caused by exessive load draw on the battery..

As said by Justin's potted battery experiments, he used and I quote a "long spool of copper wire" to create "an initial ~25C discharge rate on the cells"..
Is it possible you just went really hard on your ebike motor and drawn too much power on a hot day?
https://endless-sphere.com/forums/viewtopic.php?f=14&t=71125&start=25#p1082608

Just curious to know how hard you were going and how big is the motor/controller..

 

[amberwolf]

If a pack has a BMS on it, and that BMS is designed to allow more current draw than the pack can continously handle, for longer than the pack can do so safely, then the pack as a whole is poorly designed, as it has the wrong BMS on it (or is built with the wrong cells or insufficient parallel sets, or insufficient cooling, etc).

If the pack is designed and built right, you wouldn't be able to draw enough power from it to cause a fire; it'd shut off output if the current was too high for too long.

Even with that, it'd still be safer if it had a temperature sensor (not all do, but they should), in at least the core of the pack, and also shutdown if temperatures rose above some still-quite-safe level (because you can't only have it shut off if it reaches dangerous levels, as the cells may be even hotter inside where the temperature sensor can't yet "see").\

But just preventing damaging levels of current from being drawn should be something to be expected for prebuilt packs sold to end-users (rather than the DIY battery crowd).

 

[docw009]

News flash, batteries from quality maker can go bad a you can have a fire. One today. Battery wasn't charging, suspected the charger. Charged for several hours with known good charger. When taken off charger, "seemed warmer than usual, but not hot." Two hours later an explosion and a completely burned up Dolphin with high quality cells.

So this is a different fire from the original poster. You charged a stubborn battery and it caught fire? Hope no major damage occurred.

I am getting those steel boxes this week for my Dolphin batteries.

 

[tomjasz]

Sorry you are very lucky. I had a battery fire in the garage. Melted carbon fiber fishing poles and snow skis. Sad. I now use lifepo4 heavy but safe. Hard to find high quality lifepo4 for good price.

Late seeing this, and have a stock of batteries but I'm extremely interested in what you decided to use? Please?

 

[tomjasz]

News flash, batteries from quality maker can go bad a you can have a fire. One today. Battery wasn't charging, suspected the charger. Charged for several hours with known good charger. When taken off charger, "seemed warmer than usual, but not hot." Two hours later an explosion and a completely burned up Dolphin with high quality cells.

So this is a different fire from the original poster. You charged a stubborn battery and it caught fire? Hope no major damage occurred.

I am getting those steel boxes this week for my Dolphin batteries.

Several attempts were made to charge. It shouldn't have happened. The BMS should have been tested. And likely replaced. User error IMO. Not mine BTW.

 

[spinningmagnets]

A big plus-one...

Thanks for posting, it takes guts to expose such a disappointing event. Be happy that the photos alone will inform people. BTW I'm glad you're OK.

 

[Tor]

My new battery after the fire
- with loop key to turn on/off
- and stitched on two extra straps to hold the battery weight, for safety
Just put winter tyres with spikes on the ebikes.

Wish you all safe rides

Tor