Samsung recall: Tech solutions to enhance lithium-ion battery safety | EDN

http://www.edn.com/design/power-management/4442706/Samsung-recall–Some-possible-tech-solutions-to-enhance-lithium-ion-battery-safety-

Exploding lithiun batteries are in headlines every now and then. How they can be made safer?

314 Comments

  1. Tomi Engdahl says:

    Don’t do this! (There’s a much safer way)
    https://www.youtube.com/watch?v=M88e1r8nvYk

    I recently discovered there’s a “thing” going around where people are charging lithium cells by attaching a stripped USB lead directly to them.
    Normally lithium cells are very safe if undamaged and correct charging procedures are used. But overcharging them like this can result in cell damage and potentially fire.

    Many of the “found” lithium cells salvaged from disposable devices have no extra protection circuitry because it’s not needed in their application. But when recharging them it is very important to control the charge current and stop charging at around 4.2V

    Direct charging with a USB lead has very little current limiting and the charger will often smash more than its rated current into them, potentially damaging the charger too. It will also keep charging them beyond 4.2V and that poses a genuine risk of internal chemistry damage, potentially resulting in avalanche failure where an internal short circuit occurs. If that happens the full energy capacity of the cell will be released extremely quickly resulting in the electrolyte venting as a flammable vapour, and if sparks blow out too it can ignite resulting in a flamethrower effect.

    I want to stress that lithium cells are not dangerous because of the lithium. There’s very little lithium metal in a rechargeable cell, and it’s diffused through the electrode materials. The real hazard is their ability to store and release very high amounts of energy. (Like an overloaded Star Trek phaser.) If used correctly and protected from physical damage, lithium cells are very safe.

    You can easily and cheaply get TP4056 modules on eBay that let you charge a cell correctly from a standard USB lead. The keywords to find them are 5pcs USB TP4056. It’s often cheaper to buy them in packs of 5 or 10. There are two types – with or without the extra DW01 protection chips. It doesn’t add much to the cost, which is less than 1 £$€ per module.

    Reply
  2. Tomi Engdahl says:

    Don’t do this! (There’s a much safer way)
    https://www.youtube.com/watch?v=M88e1r8nvYk

    I recently discovered there’s a “thing” going around where people are charging lithium cells by attaching a stripped USB lead directly to them.
    Normally lithium cells are very safe if undamaged and correct charging procedures are used. But overcharging them like this can result in cell damage and potentially fire.

    Many of the “found” lithium cells salvaged from disposable devices have no extra protection circuitry because it’s not needed in their application. But when recharging them it is very important to control the charge current and stop charging at around 4.2V

    Direct charging with a USB lead has very little current limiting and the charger will often smash more than its rated current into them, potentially damaging the charger too. It will also keep charging them beyond 4.2V and that poses a genuine risk of internal chemistry damage, potentially resulting in avalanche failure where an internal short circuit occurs. If that happens the full energy capacity of the cell will be released extremely quickly resulting in the electrolyte venting as a flammable vapour, and if sparks blow out too it can ignite resulting in a flamethrower effect.

    I want to stress that lithium cells are not dangerous because of the lithium. There’s very little lithium metal in a rechargeable cell, and it’s diffused through the electrode materials. The real hazard is their ability to store and release very high amounts of energy. (Like an overloaded Star Trek phaser.) If used correctly and protected from physical damage, lithium cells are very safe.

    Reply
  3. Tomi Engdahl says:

    EU julistamassa litiumia myrkyksi
    https://etn.fi/index.php/13-news/13856-eu-julistamassa-litiumia-myrkyksi

    Euroopan kemikaalivirasto ECHA ehdottaa, että litium luokiteltaisiin vaaralliseksi aineeksi. Akkujen ja materiaalien valmistajat ovat hermostuneet ideasta, sillä se uhkaa paitsi nopeasti kasvavaa akkuteollisuutta myös koko sähköistymisen tavoitteita.

    ECHA:n mukaan litium pitäisi luokitella luokan 1A myrkyksi. Ehdotus on nyt lausuntokierroksella ja päätös siitä on luvassa ensi vuonna.

    Reply
  4. Tomi Engdahl says:

    Sähköautopalon sammuttaminen. Huomaa, kuinka valtavat liekit ja kuinka koko auto on siirretty metalliseen sammioon, jossa se lilluu vedessä ja silti palo ei sammu hetkessä, vaan voi uudelleensyttyä vielä päivienkin päästä.

    https://www.youtube.com/watch?v=Yv_ZpTTrUTU

    Reply
  5. Tomi Engdahl says:

    Esimerkkejä litiumakkupaloista ja myös niiden sammuttamisesta. Eritoten keskimmäinen video sykähdytti. Isä sai viime hetkellä lapsensa turvaan. Eli siinä vaiheessa kun akkulaitteesta tulee ulos vähän savua, äkkiä ulos.

    https://www.youtube.com/watch?v=8nz5ijXcckI

    Reply
  6. Tomi Engdahl says:

    Video Kiinasta. Sähköbussi syttyy palamaan ja sytyttää myös kaiken ympäröivän. Palokunta ei pysty pelastamaan viereisiä busseja, vaikka tuli ripeästi paikalle.

    https://www.youtube.com/watch?v=T71cVhxG_v4

    Reply
  7. Tomi Engdahl says:

    Measuring Busbar Weld Resistance in Battery Packs
    https://www.tek.com/en/documents/application-note/measuring-busbar-weld-resistance-in-battery-packs

    Electric vehicles are breaking through into mainstream automotive sales with many governments and companies pledging full electric vehicle conversions in the 2020s. The limiting factor for these vehicles is a strong supply of safe, reliable, and highly efficient battery packs. Battery manufacturers are responsible for ensuring that every battery pack meets these tight standards while keeping volume high to meet increasing demands. Manufacturers must conduct a variety of mechanical and electrical tests that are performed throughout battery construction, using fast and accurate test and measurement solutions. One such solution is the Keithley 3706A System Switch and Multimeter paired with a 2460 or 2461 High Current Source Measure Unit (SMU) to conduct the busbar weld resistance test.

    Reply
  8. Tomi Engdahl says:

    Are Samsung Phones Really Randomly Blowing Up?
    Inspect your Samsung phone ASAP!
    https://fossbytes.com/samsung-phones-randomly-blowing-up/

    Samsung may be spearheading the foldable smartphone market but is unaware of the grave problems that exist in all of its phones. Mrwhosetheboss, a popular tech YouTuber, stumbled upon the issue of battery swelling in his collection of Samsung smartphones.

    The batteries of these devices swole up to the extent that they cracked the back glass in some cases. However, the battery blow-up problem isn’t only with Mrwhosetheboss’ collection. Other YouTubers, mainly tech reviewers, have noticed that older Samsung phone batteries swell up after they are stored for a while.

    Why do only Samsung phone batteries blow/swell up?
    After realizing that three of his phones had swollen batteries, Mrwhosetheboss contacted Samsung support and shared his problem. Samsung asked to collect the devices, to which he refused at first. But afterward, he caved to their demand and submitted all the Samsung phones with swollen batteries to the company.

    He was expecting a prompt response from Samsung on this issue but never received any follow-up mail. After 50 days, Mrwhosetheboss decided to do a little bit of investigation himself and contacted other YouTubers about the issue.

    Many Samsung phones in storage with multiple YouTubers had a bloated battery. This was a major wake-up call for Mrwhosetheboss, who then contacted MKBHD, who also had a similar experience with Samsung phones. MKBHD said that his team periodically identifies and removes the swollen battery smartphones from the collection.

    It was crystal clear that Samsung smartphones have this issue that no one ever spoke about. Samsung has had a long history of battery blow-up issues and even accidental blasts in some cases. It became such a big problem that many airlines even banned passengers from carrying the infamous Samsung Galaxy Note 7.

    Reply
  9. Tomi Engdahl says:

    Mitä iPhonen lataamisen aikana tapahtuu?
    https://etn.fi/index.php/13-news/14098-mitae-iphonen-lataamisen-aikana-tapahtuu

    Tech Insights on julkistanut mielenkiintoisen analyysin siitä, mitä kahden suositun huippupuhelimen lataamisen aikana tapahtuu. Analyysin alla on kaksi hitaasti latautuvaa puhelinta, Samsungin S22 Ultra ja iPhone 13 Pro Max. Tässä keskitytään iPhonen latausprosessiin, koska aihe on ajankohtainen EU:n tuoreen latausporttilain myötä.

    Apple esitteli Phone 13 Pro Max -puhelimen vuosi sitten syyskuussa. Siinä on 4352 milliampeeritunnin akku ja Applen omalla 20 watin laturilla akku täyttyy 106 minuutissa.

    Litiumionakuissa kennojen hajoaminen johtuu pääasiassa sivureaktioista akun latauksen aikana. Näitä ovat esimerkiksi litiumpinnoittuminen eli saostuminen grafiittisen anodin pinnalle. Ilmiötä vauhdittavat korkeat lämpötilat, joita havaitaan ladattaessa suurella virralla. Suuren virran käyttäminen johtaa epätasaiseen paksuuntumiseen, mikä nopeuttaa solujen hajoamista.

    Näitä haitallisia ilmiöitä laitevalmistajat yrittävät helpottaa omilla latausalgoritmeillaan. Käytännössä kyse on laturin ohjaimelle annettavista käskysarjoista, joiden perusteella latauksen virtaa ja jännitellä säädellään. Tavoitteena on mahdollisimman nopea lataus ilman, että akun kapasiteetti kärsii kennojen heikentymisestä.

    Algoritmeja on hyvin monia erilaisia ja yrityksillä on usein omia nimityksiä niille. Perustaltaan niissä on paljon samaa. iPhone 13 Pro Maxin latauksessa on Tech Insightsin analyysin mukaan kuusi eri vaihetta.

    Reply
  10. Tomi Engdahl says:

    Lithium-ion batteries made with recycled materials can outlast newer counterparts
    Proving performance could boost battery manufacturers’ confidence in reused materials
    https://www.sciencenews.org/article/recycled-lithium-ion-battery-charge

    Reply

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