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#bms

1 post1 participant0 posts today
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Dendrobatus Azureus

It has taken me about 12 minutes to cool down an 18650 battery which was heating up, that it was almost too warm to the touch. The battery was in the charger which clearly doesn't properly communicate with the BMS, creating a fairly dangerous situation
The battery in someone else's hand could have spontaneously combusted into flames igniting the charger and then the wood of the table it was standing on.
I have a habit of standing up, way in the depths of the night, either because I want to go training on my race machines, or because I want to physically feel how warm the batteries are that I'm charging.

Today I'm very glad that I routinely do this, because the BMS failed, a temperature sensor is obviously absent in the charger, and the chemicals would have potentially created a runaway situation because the battery was running this hot for at least a couple of hours!

The 18650 cell delivers the energy that is needed just fine it just cannot charge to 100% anymore

Of course I have marked the cell, so I can now manually remove it from the charger

The image features a cylindrical object, likely a bullet casing, lying diagonally on a fabric surface. LLM error it's an 18650 cell. The object is dark brown with a smooth, matte finish, and appears to be made of metal or a similar material. It has a slightly tapered shape, with a slightly wider opening at one end. The fabric background is vibrant red with a floral pattern, including large white flowers with brown and blue accents. The texture of the fabric is visible, suggesting a woven material. The lighting in the image is soft, casting a gentle shadow beneath the object, enhancing its three-dimensional appearance. Ovis2-8B 🌱 Energy used: 0.167 Wh
#Electronics#battery#cell
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Tobias Zeumer

In Hamburg muss man sich ja bei jeder Wissenschaftlichen Bibliothek einzeln anmelden, aber nur einmal zahlen - braucht man natürlich Quittung als Nachweis.

"Mitgliedschaftscheck Hamburger wissenschaftliche Bibliotheken" (collaborating.tuhh.de/tub/dd/l) hätte das geändert (aktiv nur für TUB und HCU).

Mir fällt gerade ein, dass mit dem neuen PAIA 2.9 auch der Bedarf an Datenbankzugriff wegfällt. Naja, aber lohnt wohl auch nicht mehr.

GitLabUniversitätsbibliothek / Digitale Dienste / LBS / LBS Interfaces / library-membership-api · GitLabLösung zur einfachen Abfrage der Ausweisgültigkeit bei allen (Hamburger Wissenschaftlichen) Bibliotheken.
#lbs#bms#PAIA
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in_sympathy

Since it’s #blackouts in #Ukraine again - time to fix a small #UPS that I bought as broken months ago.

Originally it had a cheapest #BMS that got HOT and same level batteries - 8/12 were dead when I got it.

I replaced batteries with proper 3000+ mAh ones wired in 3S4P and a 40A BMS - now it stays stone cold and should power my router for 10-12 hours.

Spot welded it today during blackout and soldered with my #Hakko powered by #Bluetti 😆.

#diy#ifixit#fluke117
Replied in thread
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Blackbird

@marian @solarpapst Hab ich mich auch gefragt. Was ist überhaupt "eingesetzt"?

Beim #Windrad liegt das theoretische Maximum ja bei 59% (#Betz'scher #Leistungsbeiwert) und bei der #Solarzelle läuft die Forschung immer weiter (#Perowskit) und ist aktuell in ähnlichen Größenordnungen beim Wirkungsgrad unterwegs. Also deutlich unter 100%.
Das ist aber gar nicht der Punkt, denn egal wie ineffizient #EE gewonnen wird, sie ist kostenlos, unschädlich und praktisch unendlich.

Statt "eingesetzt" würde ich deshalb "eingekauft" verwenden, denn #Wind und #Sonne stellen keine Rechnung, der Mineralölkonzern schon. Dann müsste man den Jahresertrag nur durch den Jahresenergiebedarf für die Regelung teilen, was Quotienten deutlich über 100% ergibt. Eher 6MWh/(365*24h*50W) > 1000%, wenn ich meiner #PV+#WR+#BMS einen richtig schlechten Standby-Verbrauch von 50W unterstelle, der ausschließlich aus dem Netz bezogen wird.

Berücksichtigt man noch Invest, Wartung und dergleichen, hat man #Gestehungskosten. Die sind allerdings abhängig von der Stückzahl und deshalb für einen Markt-unabhängigen Technologievergleich ungeeignet.

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Ocēlōtl cehuetzilizpan 🌱

I just wanted to share how bizarre a product my #Winwing 16EX (ViperAce) joystick is.

In order for the integrated vibration motor to function, you’re required to purchase an additional plastic module that fastens to the top left of the stick. It features a 5-way HAT and a 2-axis stick with push.

The module itself contains no vibration motor. Just the chip that controls the motor inside the stick. My guess is that they couldn’t fit the chip inside the stick itself. It’s a ridiculous design.

On the other hand, they’re using a cheap switch to give the trigger a “click”. Brilliant honestly.

With the module attached the vibration from within the stick itself will only work when the Winwing SimAppPro software is running in the background, which includes the default (and customizable) vibration settings for aircraft of various flight sims like #DCSWorld, #BMS, and #MSFS.

The vibration isn’t force feedback but it does vary in how it vibrates with different aircraft in a way that’s pleasant and intuitive to the touch. This goes for all their products featuring vibration motors.

Pulling high AoA in a Mirage F1? It’ll vibrate aggressively.

Launching a Sparrow in an F/A-18C? It’ll give a short gentle vibration as the missile comes off the rail.

Vortex Ring State setting in while hovering your Mi-24? It’ll start buffeting against your hand with increasing intensity.

If you don’t care about vibration and don’t want SimAppPro running in the background, then don’t bother with the additional “shaker” module. It doesn’t “add” a whole lot.

Despite the stupid design, it’s a great product. I’ve had no issues over the past few months of use.

Interior side of Winwing “Shaker” module, showing a small square window with a red cable sticking out. This plugs into the top left of the joystick.
Winwing “Shaker” module plugged into the top left port of the 16EX stick.
Interior of the Winwing “Shaker” module showing various sensors, connectors, and chip boards. An isolated white and black electronic switch is glued to the plastic housing to provide a tactile, audible “click” to the second additional trigger the module provides.
Interior of the Winwing “Shaker” module showing various sensors, connectors, and chip boards. An isolated white and black electronic switch is glued to the plastic housing to provide a tactile, audible “click” to the second additional trigger the module provides.
#HOTAS
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Al

#TILT - Things I Learned Today

File this under #WTH - What the hell

"... Chinese-manufactured disposables ...liquid nicotine is classified by the EPA as a hazardous waste, e-waste recycling is mostly impossible...."

arstechnica.com/gadgets/2024/1

Not be be a kill-joy but
Warning: dont do this without a full understanding of why #lithium battery packs need a #bms
If any of these words are strange to you, you dont know enough to know how to do it safely.

Ars Technica · Guy makes “dodgy e-bike” from 130 used vapes to make point about e-wasteBy Kevin Purdy
Replied in thread
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Al

@benfulton @enobacon
not that I have heard of, just watch your pack voltage. The range between full and empty will decrease with age, ie capacity, but the voltage from full to "empty" should not change.
I noticed that earlier the controller would give me an error at low voltage; at end of life it just shut down and would not power up until I turned the key off and back on.
It was the #BMS in the #pack protecting the pack.

Replied in thread
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Al

@benfulton @enobacon
mine died with 44 volts left.
be careful! I was able to recharge mine and thought I could ride it with reduced range.
On the second recharge I happen to walk by and felt the bike where the battery was. It was HOT and the change voltage was no where close to full.

without a cell by cell #BMS, a single cell can go bad but the whole pack may seem almost fine.
This is one way a fire can start.
my pack was about 4yrs old with 4500 miles on it.

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Anne Christensen

Pressemitteilung zum Markteintritt von Systematic in Deutschland auf der Website von Marshall Breeding:

librarytechnology.org/pr/30608

Damit hat sich für die öffentlichen Bibliotheken, die nach einem neuen #BMS suchen, eine neue Alternative aufgetan.

Ich denke prinzipiell weiterhin, dass Open Source-Lösungen besser zu Bibliotheken passen. Aber: Die großen Aufgaben wie Kompetenzaufbau & Abschneiden alter Zöpfe sind ohnehin immer die gleichen, und Prinzipienreiterei hilft nirgends weiter.

librarytechnology.orgLibrary Technology Guides: Documents, Databases, News, and Commentary
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rawe

Frage an die #fahrradbubble zu #bosch #pedelec #powerpack Akku: Wenn die Diode am Spannungsregler auf dem #BMS stirbt: Einfach tauschen gegen 40V 1A Schottky und der rennt wieder? Der Akku hat ca. 7000 km runter, Baujahr 2018, Typ Powerpack 500.

Edit: werde es mal mit Tausch durch 60v 1A probieren.

Die Diode starb beim Aufladen kurz vor Ende (4,15 V Zellspannung). Macht bei 10s ~42 V. Je nach dem was noch so vor dem Spannungswandler hängt kriegt der IC fast die volle Packspannung ab und wenn der Spannungsabfall über den Pass-Transistor zu klein ist... da sind 40V etwas heikel.

Der TPS57160-Q1 ist etwas schwer zu bekommen, somit also erst mal schauen obs ohne dessen Tausch wieder funktioniert. Man kann ja erstmal vorsichtig mit dem Labornetzteil schauen ob der den Kurzschluss am Ausgang überlebt hat. Wenn da länger Batteriespannung anlag sind sowieso die ganzen 5V ICs hin...

Nahaufnahme Schottkydiode auf BMS
#electronik#reparatur#ebike
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