Home Ruination by Ebike Battery Fire Expulserating PreTerminator™®©℠

[StuartsProjects]

I was never taken in by Blakes 7, ORAC was clearly fake.

I am sure everyone else also noticed that although Blakes 7 was supposadly many many years in the future, ORACs insides contained a bit of 0.1" copper stripboard, labeled as RadioSpares\RSComponents as I recall.

 

[guerney]

I was never taken in by Blakes 7, ORAC was clearly fake.

I am sure everyone else also noticed that although Blakes 7 was supposadly many many years in the future, ORACs insides contained a bit of 0.1" copper stripboard, labeled as RadioSpares\RSComponents as I recall.

Whatever happened to those dudes?

It's a well known fact our future selves in UFOs use wormholes to visit the past to shop, avoiding crushing butterfly wings.

https://en.wikipedia.org/wiki/A_Sound_of_Thunder

 

[guerney]

This Home Ruination by Ebike Battery Fire Expulserating PreTerminator™®©℠ is working well - has provided peace of mind, hasn't prompted me to throw my soon to be flaming battery out of the window. Weather has turned a bit cooler, therefore I have set the motorbike horn to sound 6°C over the ambient 15.8°C air temperature of the room it's charging in. Did a quick test of the horn first via the inline switch, to check function. I'm ready to expulserate my ebike battery within seconds.

 

[StuartsProjects]

It's a well known fact our future selves in UFOs use wormholes to visit the past to shop, avoiding crushing butterfly wings.

Indeed, and unless they subscribe to Amazon Prime, they would not have free delivery.

 

[Az.]

Indeed, and unless they subscribe to Amazon Prime, they would not have free delivery.

I pay £95 per year for free delivery. It is as free as Freeview.

 

[guerney]

Indeed, and unless they subscribe to Amazon Prime, they would not have free delivery.

Millions of years in the future, the immortal perfectly preserved and augmented Bezos brain in a jar fed by blood plasma of genetically matched sacrificial neborns, has forced Amazon employees to travel here in flying saucer time machines to trim entire family trees of anti-Galaxiters by anal probe death before they are born, for tax reasons. They daren't risk being seen by anyone else, lest it lowers future profits. Galaxit means Galaxit! Flying saucers solved.

 

[guerney]

So to paraphrase the CSA briefed the IO, the IO examined the charger and battery and briefed the Coroner who officially concluded they probably didn't match. Bike chargers and batteries of 36V and 48V look very similar before they're burnt, although in this case the parts may have been distinctive or the labels may have survived.

There's nothing to say the conclusion's wrong but the probable explanation sounds as though it could be an assumption, which would delay recognising a true cause that's any different, such as a sub-standard BMS not cutting off the correct charger when the first cell hits HVC. Fire services have updated their ebike fire reporting but it would still be useful to have more detail.

Or perhaps charger component(s) failure causing sudden output of high voltage? I recall @Nealh saying one of his did that but he caught it early - does anyone know how often that happens? Should I solder on one of these to cut voltage at 42.2V?

https://vi.aliexpress.com/item/1005006950914995.html

Is there a convenient and cheap gizmo somewhere out there which switches on power supply upon detection of a user defined voltage? If so, I could cobble together a second alarm to sound at 42.2V, and use with my Ebike Battery Fire Expulserating PreTerminator™®©℠, which I never charge my battery without:

https://www.pedelecs.co.uk/forum/threads/home-ruination-by-ebike-battery-fire-expulserating-preterminator%E2%84%A2%C2%AE%C2%A9%E2%84%A0.46934/


Physical evidence would likely be completely destroyed of course, but there ought to be receipts emailed listing basic specs of anything bought new online such as the charger, or more complete specs via links through the user account of the platform it was bought from, for particularly grittily warty and unpleasantly determined hard boiled gumshoes to find.

The cheap convenient gizmo is that same item, it could either cut the charger (NC contact) or power a second alarm (NO contact). But recall saneagle's wise words, basically you need to be sure that safety gear's reliable.

Aha! Yes, thank you, I realised the same gizmo could do that a short while ago, silly me.

Re: safety gear reliability: The Ebike Battery Fire Expulserating PreTerminator™®©℠ is separately mains powered, and situated a safe distance away, with only the heat probe making contact with the battery via a long wire - that failing wouldn't be much of a worry. What shape would failure of that gizmo take? Puff of magic smoke? A small fire? Either would set off the smoke alarm. I can cope with anything but explosion. Of course by the time igniteable smoke is produced by the battery, it's far too late to do anything but run.

Ordered it out of interest...

https://www.aliexpress.com/item/1005006950914995.html

The insidious and sticky nature of the dark patterns of AliExpress sales forced me to buy oodles of other cheap and possibly useless tat I only visited to buy two items, ended up buying 22! I really should put AliExpress.com on my firewall blocklist. Mind you, this sale is pretty good.

 

[guerney]

I'm quite happy with my Home Ruination by Ebike Battery Fire Expulserating PreTerminator™®©℠ in it's current incarnation, but I notice Bobby (you all know Bobby right? Knows a thing or two about batteries does our Bobby, whoever this Bobby guy is) pointing out four temperature sensors which switch off the charger, in this short "MAJOR DIFFERENCES between UL2271 battery and NON CERTIFIED" public information video on antisocial media. FF to the 2 minute mark:

11K views · 87 reactions | Why do PMDs catch on fire while charging? Bobby explains 3 MAJOR DIFFERENCES between UL2271 battery and ❌NON CERTIFIED batteries. | By Mobot | Facebook

Why do PMDs catch on fire while charging? Bobby explains 3 MAJOR DIFFERENCES between UL2271 battery and ❌NON CERTIFIED batteries.

www.facebook.com

I can't increase cell spacing, and I guess there are more temperature sensors within the pack... but it wouldn't be impossible to drill four holes into the casing, fit waterproof-ish connectors...

2.1MM X 5.5MM METAL PANEL MOUNT DC SOCKET + DUST/WATERPROOF COVER | eBay

COVER PLUGS INTO SOCKET TO PROVIDE PROTECTION FROM DUST, DIRT AND WATER. - IDEAL FOR EXTERNAL APPLICATIONS WHERE YOU NEED TO HAVE SOCKET PROTECTED WHEN NOT IN USE. TAKES STANDARD 2.1MM X 5.5MM DC JACK.

www.ebay.co.uk

...connect them to four temperature sensors covered with heat conductive electrically insulating silicone sheet (in case they fall off) glued to the pack, in order to monitor temprature within the battery case while charging, and set off an alarm when any of the sensors reach 65°C, connect a relay to turn off power from the charger, or (if you have genuine STC-1000) program a small compute module to record data, sound the alarm, and discontinue charging. Bodge retrofit a poor imitation of that part of the UL2271 spec. Wouldn't be impossible to make a system which switches off power if overheating is detected while the battery is in use either.

I just found this BMS on Aliexpress. It has three temperature sensors, active balancing via Bluetooth, switch, and can be configured for different cell voltages and number of series strings. It also has a UART port. I wonder what that can do?

JBD Smart LiFePO4 BMS 6S 8S 12S 13S 14S 16S 20S 21S With Bluilt-in Bluetooth 40A 80A 100A Balance Board Uart Function For E-bike - AliExpress 44

Smarter Shopping, Better Living! Aliexpress.com

vi.aliexpress.com

Communication with the charger perhaps, to stop charging when either of the two external temperature sensors or one internal or all or some permutation of the three detect 65 degrees Centigrade? My one somewhat more external temperature sensor sets off a 12V 120db bike horn, which stops me charging my battery and starts me throwing it out of my window.

Home Ruination by Ebike Battery Fire Expulserating PreTerminator™®©℠

Consider this a trailer promoting my easy to assemble ebike battery safety contraption. Photos with details and an ever so slightly better video will follow.

www.pedelecs.co.uk

I reckon it's probably Chinese BMS maufacturers starting to anticipate greater demand for cheap but safer batteries.