Kebakaran bateri litium-ion: keselamatan pelarian haba dan pembendungan¶

Bateri litium-ion menguasai berbilion-bilion peranti pengguna dan komersil, daripada telefon pintar, komputer riba, dan bank kuasa mudah alih kepada alat kuasa tanpa wayar, basikal elektrik (e-basikal), skuter elektrik, dinding simpanan tenaga suria rumah dan kenderaan elektrik (EV). Walaupun sel yang dihasilkan dan diselenggara dengan betul beroperasi dengan selamat selama bertahun-tahun, kesan fizikal, pengecasan berlebihan, pengecasan subsifar, pencerobohan air atau pengecas yang tidak disahkan boleh menolak sel litium-ion ke dalam tindak balas rantai kimia bencana yang mampu bertahan sendiri yang dipanggil termal lari.

Semasa pelarian haba, litar pintas dalaman menyebabkan suhu sel meningkat melebihi 600 hingga 1,000 darjah Celsius (1,100 hingga 1,830 darjah Fahrenheit) dalam beberapa saat. Elektrolit cecair organik mengewap dan mengeluarkan gas bertekanan, toksik, mudah terbakar yang menyala dalam arah, pancutan seperti obor. Oleh kerana bahan katod logam-oksida yang mereput membebaskan oksigen mereka sendiri secara dalaman, api bateri lithium-ion tidak boleh dipadamkan seperti api kayu atau gris biasa dan memerlukan pemindahan segera dan penyejukan air volum tinggi khusus.

Lakukan ini sekarang¶

1. Kosongkan bilik dan bangunan dengan serta-merta. Keluarkan setiap orang dan haiwan peliharaan keluar dari bilik dengan segera dan tutup pintu dalaman dengan kuat di belakang anda untuk menahan awan wap meletup dan menghalang penyebaran api semasa anda keluar dari bangunan.
2. Jangan sekali-kali menyedut awan wap bateri berwarna putih, kelabu atau hitam. Kekal rendah di bawah lapisan asap semasa anda berpindah; pengaliran sel litium-ion membebaskan hidrogen fluorida (HF), fosforil fluorida (\(\teks{POF}_3\)), hidrogen sianida (HCN) dan karbon monoksida (CO) yang menyebabkan kerosakan paru-paru kimia yang teruk dan ketoksikan sistemik dalam beberapa pernafasan.
3. Hubungi nombor kecemasan tempatan anda dari luar. Dail 911 di Amerika Syarikat dan Kanada, 112 di seluruh Kesatuan Eropah, 999 di United Kingdom atau 000 di Australia (lihat semua nombor kecemasan) dan nyatakan dengan jelas bahawa bateri litium-ion berada dalam pelarian haba (dan nyatakan saiz: telefon, e-basikal, dinding suria atau EV) supaya anggota bomba menggunakan saluran air volum tinggi dan alat pernafasan serba lengkap (SCBA).
4. Potong kuasa elektrik pada pemutus utama hanya jika selamat. Jika peranti dipalamkan dan panel pemutus elektrik anda terletak di kawasan selamat dan bebas asap di sepanjang laluan keluar anda, matikan pemutus litar; jangan sekali-kali mencapai pengecas, alur keluar atau kabel bateri yang merokok.
5. Use copious water on small devices, or use an extinguisher only on surrounding furnishings. Standard ABC dry chemical or \(\text{CO}_2\) fire extinguishers cannot stop chemical thermal runaway inside battery cells; use them only to knock down flames on curtains or carpets blocking your exit, or pour large volumes of plain water from a safe distance onto a small unplugged smartphone-sized device to cool adjacent cells.
6. Lindungi daripada penyalaan semula yang tertunda selama 24 hingga 72 jam. Jangan sekali-kali membawa bateri yang terbakar, terjatuh atau bengkak ke dalam rumah selepas api padam, kerana sisa haba yang terperangkap dan tenaga elektrik yang terkandas kerap menyebabkan sel bersebelahan dalam pek meletup beberapa jam atau beberapa hari kemudian.

Emergency decision flow for lithium-ion battery failures¶

flowchart TD
    Start["Lithium-Ion Battery Anomaly Detected<br/>Swelling, extreme heat, hissing, sweet solvent odor, or vapor"] --> ActiveVent{"Is the battery actively hissing, popping,<br/>venting white/gray vapor, or shooting flames?"}

    ActiveVent -->|Yes, active thermal runaway| LocationCheck{"Where is the burning battery located?"}
    LocationCheck -->|Home, Apartment, Garage, or EV| EvacuateNow["Evacuate Immediately and Close Doors<br/>Do NOT touch, kick, or carry the battery<br/>Stay low; avoid inhaling white/gray HF vapor cloud"]
    LocationCheck -->|Inside Aircraft or Train Cabin| CrewAlert["Alert Cabin Crew Immediately<br/>Do NOT move seat mechanism if phone is jammed in seat<br/>Crew knocks down flames with Halon and pours water"]

    EvacuateNow --> CallDispatch["Call Emergency Dispatch from Outside<br/>911 US/Canada, 112 EU, 999 UK<br/>Report exact battery size (phone, e-bike, or EV)"]
    CrewAlert --> Submerge["Crew Submerges Cooled Device in Water Container<br/>Monitor throughout remainder of journey"]

    ActiveVent -->|No, only swollen ('spicy pillow') or warm| UnplugSafe["Power Down and Unplug Charger Safely<br/>Never puncture, squeeze, or pry a swollen foil pouch"]
    UnplugSafe --> IsolateOutdoors["Isolate Small Device Outdoors on Concrete or in Sand<br/>Keep at least 5 meters (16 feet) from structures<br/>Transport to municipal hazardous waste (HHW) facility"]

Electrochemistry of Thermal Runaway: Why Battery Fires Behave Like Blowtorches¶

To understand why you cannot smother a burning e-bike or smartphone battery with a baking sheet, towel, or fire blanket, it helps to examine what happens inside a lithium-ion cell during the four stages of failure:

1. Anode, Cathode, Separator, and Organic Electrolyte Architecture¶

Every rechargeable lithium-ion cell contains four core internal components tightly wound or stacked inside a sealed aluminum pouch or cylindrical steel canister: - The Anode (Negative Electrode): Typically made of graphite coated onto thin copper foil, which stores lithium ions when the battery is charged. - The Cathode (Positive Electrode): Made of a lithium metal oxide, such as Lithium Nickel Manganese Cobalt Oxide (NMC), Lithium Cobalt Oxide (LCO), or Lithium Iron Phosphate (LFP), coated onto aluminum foil. - The Polymer Separator: A microscopic, porous polyethylene or polypropylene film only 12 to 25 micrometers thick (roughly one-quarter the thickness of a human hair) that physically keeps the anode and cathode from touching while allowing lithium ions to pass back and forth. - The Liquid Electrolyte: A lithium salt, most commonly lithium hexafluorophosphate (\(\text{LiPF}_6\)), dissolved in highly flammable organic carbonate solvents (ethylene carbonate, dimethyl carbonate, and diethyl carbonate) that have flash points similar to gasoline.

2. The Four-Stage Exothermic Chain Reaction¶

1. Stage 1: Separator Breach and Internal Short Circuit (70 to 90 C / 158 to 194 F): Mechanical crushing (dropping a scooter, crashing an EV, or crunching a phone in a recliner seat), overcharging past 4.25 volts per cell, water corrosion across the Battery Management System (BMS), or microscopic metallic lithium dendrites (sharp needles that grow on the anode when a battery is charged in freezing temperatures below 0 C / 32 F) pierce the paper-thin polymer separator. The anode and cathode touch directly, discharging all stored electrical energy through a microscopic point.
2. Stage 2: SEI Layer Breakdown and Self-Heating (90 to 130 C / 194 to 266 F): At around 90 degrees Celsius, the protective Solid Electrolyte Interphase (SEI) film on the graphite anode dissolves exothermically. Even if you unplug the charger at this moment, the chemical reaction inside the cell is now generating its own heat faster than the casing can dissipate it.
3. Stage 3: Separator Meltdown and Electrolyte Vaporization (130 to 200 C / 266 to 392 F): At 130 to 165 degrees Celsius, the entire polymer separator melts completely, turning the entire surface area of the cell into a massive dead short. The liquid organic carbonate solvents boil into high-pressure flammable gas (a mixture of hydrogen, carbon monoxide, methane, ethylene, and vaporized solvent droplets), bulging pouch cells or popping the safety vent on steel cylindrical cells with a loud hiss.
4. Stage 4: Cathode Decomposition and Autogenous Oxygen Release (200 to 1,000+ C / 392 to 1,830+ F): Above 200 degrees Celsius, the metal-oxide cathode crystal structure collapses and releases pure molecular oxygen (\(\text{O}_2\)) internally. Because the battery supplies its own fuel, its own ignition heat, and its own internal oxidizer, it burns fiercely even underwater, in a vacuum, or underneath Carbon Dioxide (\(\text{CO}_2\)) or foam blankets. In multi-cell packs (such as a 48V e-bike pack containing 50 to 90 cylindrical 18650 atau 21700 cells), the 900-degree-Celsius heat from Cell #1 conducts through the nickel busbars to Cell #2 within 10 to 30 seconds, triggering a domino-like cascade of explosions (cell-to-cell propagation).

Early Warning Signs of Impending Thermal Runaway¶

A lithium-ion battery almost always displays physical, olfactory, or auditory warning signs minutes, hours, or days before flames erupt. Recognizing these precursors allows you to isolate the device outdoors before ignition:

• Swelling, bulging, or "spicy pillow" deformation: In flat pouch cells (smartphones, tablets, laptops, and portable power banks), gas from slow electrolyte decomposition inflates the sealed foil pouch. Watch for a smartphone screen lifting away from the frame, a laptop whose metal bottom rocks uneven on a flat desk, or a trackpad that suddenly becomes stiff and refuses to click down.
• Hissing, whistling, clicking, or sharp popping noises: In cylindrical steel-can cells (e-bikes, scooters, cordless drills, and EVs), internal pressure builds until the scored metal safety vent disc ruptures with a sharp metallic click or pop followed by a loud, pressurized hiss.
• Sweet, fruity, nail-polish-remover odor: Before visible smoke appears, leaking or venting dimethyl carbonate and ethyl methyl carbonate solvents produce a distinct sweet, pungent chemical smell resembling acetone (nail polish remover), bubble gum, or ether.
• Unprovoked extreme heat: A battery pack or phone that becomes painfully hot to touch (above 60 degrees Celsius / 140 degrees Fahrenheit) while charging or sitting idle in a backpack is experiencing an active internal micro-short.
• Dense white or gray pressurized vapor: Prior to open flame ignition, the battery ejects thick, heavy streams of white or gray vapor consisting of aerosolized flammable electrolyte droplets and hydrogen gas. Beware of white vapor cloud explosions: Sometimes a battery vents white gas without immediately catching a spark. If this white cloud fills an enclosed room, closet, or hallway, it forms a fuel-air explosive mixture that can detonate with a violent pressure wave (deflagration) the moment it reaches a refrigerator compressor, light switch, or static spark, blowing out windows and interior walls.

Comparing Battery Chemistries, Fire Behavior, and Suppression Agents¶

Not all batteries react identically when damaged or overcharged. Use this technical reference table to distinguish standard rechargeable lithium-ion chemistries from lithium iron phosphate, lead-acid, and non-rechargeable metallic lithium cells.

Why Standard Fire Extinguishers Fail on Battery Packs¶

Understanding what common home and office fire extinguishers can, and cannot, do during a lithium-ion emergency prevents fatal delays:

Toxic Gas Hazards and First Aid for Battery Smoke & Acid Exposure¶

The white, gray, or black plume venting from a lithium-ion battery is an acutely toxic chemical weapon cloud. When the \(\text{LiPF}_6\) electrolyte salt reacts with heat and trace water vapor in the air, it decomposes into hydrogen fluoride (HF) gas and phosphoryl fluoride (\(\text{POF}_3\)), alongside carbon monoxide (CO), hydrogen cyanide (HCN), formaldehyde, benzene, and aerosolized heavy-metal oxides (cobalt, nickel, and manganese).

Why Hydrogen Fluoride (HF) Is Uniquely Lethal¶

The OSHA/NIOSH Immediately Dangerous to Life or Health (IDLH) threshold for hydrogen fluoride gas is just 30 parts per million (ppm), yet a single venting e-bike or EV battery in an enclosed garage or apartment hallway can generate local HF concentrations of 100 to 1,000+ ppm. - When inhaled into the moist airways or deposited onto sweaty skin, HF gas forms hydrofluoric acid. - Unlike hydrochloric or sulfuric acid, which dissociate immediately and burn only the outer surface layer, undissociated hydrofluoric acid molecules pass effortlessly through intact skin and alveolar lung membranes deep into tissues and the bloodstream. - Once inside the body, the fluoride ion (\(\text{F}^-\)) binds voraciously to positively charged calcium (\(\text{Ca}^{2+}\)) and magnesium (\(\text{Mg}^{2+}\)) ions, stripping calcium out of nerves, heart muscle, and bone: 1. Delayed Chemical Pulmonary Edema (12 to 36 hours later): A person who breathes 3 or 4 lungfuls of white battery vapor while kicking a burning scooter out of their hallway may feel only mild throat scratchiness and a dry cough for the first 4 hours, then wake up in the middle of the night drowning in pink frothy lung fluid as delayed chemical pneumonitis and laryngeal edema set in. 2. Systemic Hypocalcemia and Sudden Cardiac Arrest: Absorbed fluoride precipitates blood calcium into insoluble calcium fluoride, triggering tetany, QT-interval prolongation on the ECG, and sudden fatal ventricular fibrillation.

Step-by-Step First Aid for Battery Vapor or Liquid Contact¶

1. Evacuate to fresh air upwind immediately: Never re-enter a smoke-filled room to retrieve pets or valuables without firefighter positive-pressure SCBA breathing gear.
2. Strip contaminated clothing: If visible battery vapor condensate, black electrolyte soot, or liquid electrolyte sprayed onto someone's clothing or skin, remove their outer clothing immediately (using nitrile gloves if available so you do not burn your own hands) and seal the clothes in a plastic bag.
3. Flush skin or eyes with running water for 15 to 20 minutes: Irrigate any exposed skin or eyes immediately under a strong stream of cool tap water, a shower, or sterile saline for a full 15 to 20 minutes.
4. Apply 2.5% Calcium Gluconate Gel if available: If an industrial or laboratory workplace first aid kit contains 2.5% calcium gluconate topical gel (the specific chemical antidote that binds fluoride ions before they steal body calcium), massage the gel continuously into flushed skin burns while waiting for paramedics.
5. Mandate emergency department evaluation for ANY enclosed smoke inhalation: Anyone who inhaled visible lithium-ion battery vapor inside a room, garage, vehicle, or stairwell, or who has a cough, hoarse voice, stridor, chest tightness, eye burning, or a soapy/metallic taste in the mouth, must go to a hospital emergency department immediately for at least 12 to 24 hours of observation, serial blood calcium/magnesium/potassium testing, continuous ECG monitoring, and nebulized 2.5% calcium gluconate inhalation therapy, even if they feel fine at the scene.

Containment Protocols by Device Size and Environment¶

1. Smartphones, Vapes, Earbuds, Laptops, and Power Banks (5 to 100 Wh)¶

• Managing a swollen ("spicy pillow") battery that is NOT hot or hissing:
• Power the device down immediately and unplug the charging cable.
• Never try to puncture a swollen battery pouch with a pin to "relieve pressure," and never try to pry a glued swollen battery out of a phone or laptop chassis with a metal screwdriver or knife. The foil pouch is stretched taut with flammable gas; a tiny pinhole admits air and sparks an instant blowtorch flare.
• Bawa peranti utuh ke luar dari tangga dan pintu. Letakkannya di dalam baldi logam, ketuhar Belanda besi tuang atau pasu bunga tanah liat yang separuh diisi dengan pasir kering, tanah atau sampah kucing mineral yang tidak bergumpal (atau Vermiculite) di tempat luar berbumbung sekurang-kurangnya 5 meter (16 kaki) dari rumah anda, dan bawa ke pusat Sisa Berbahaya Rumah (HHW) perbandaran atau pusat Call2Recycle. Jangan sekali-kali membuang sebarang bateri litium-ion atau vape pakai buang ke dalam tong sampah rumah atau tong kitar semula di tepi jalan, tempat pemadat hidraulik lori sampah menghancurkannya dan menyalakan ratusan trak sanitasi dan loji kitar semula kebakaran setiap tahun.
• Jika telefon kecil, vape atau komputer riba menyala di dalam rumah:
• Jika anda boleh mencabut kord dinding dengan selamat atau membalikkan pemutus tanpa menghirup asap, berbuat demikian.
• Setelah jet suar 30 hingga 60 saat awal reda, tuang periuk atau baldi air kosong secara berterusan ke atas peranti untuk menyejukkan sel yang tinggal di bawah suhu lari.
• Menggunakan penyepit barbeku logam panjang, sarung tangan api atau penyodok logam yang dikendalikan panjang (sambil memastikan muka anda ke arah angin), cedok peranti yang telah disejukkan ke dalam baldi logam dalam atau plastik berat yang diisi dengan 10+ liter (2.5+ gelen) air di luar rumah dan biarkan ia terendam selama sekurang-kurangnya 48 jam untuk mengeluarkan sisa haba.

2. E-Bikes, Skuter Elektrik dan Hoverboard (250 hingga 2,000 Wj)¶

Pek bateri mobiliti mikro menyimpan 20 hingga 100 kali lebih banyak tenaga daripada bateri telefon pintar dan mewakili punca kebakaran pangsapuri bandar yang paling pesat berkembang di seluruh dunia.

• Apabila bateri e-basikal berdesing atau berasap, JANGAN melawannya, EVACUATE: Sebaik sahaja pek e-basikal 500 hingga 1,000 Wj mula mendesis atau meletus, anda mempunyai kira-kira 10 hingga 20 saat sebelum bilik itu dipenuhi dengan asap toksik yang menyilaukan dan jet flamesius 1,000 darjah Celcius. Biarkan di tempatnya, bawa semua orang keluar dari bilik, tarik pintu bilik tertutup, dan tinggalkan bangunan.
• Peraturan Emas Penyimpanan Pangsapuri: Jangan sekali-kali menyimpan atau mengecas e-basikal, e-skuter atau papan hover di ruang legar pangsapuri, lorong sempit, laluan ruang tamu yang menghalang pintu hadapan atau tangga bangunan. Lebih 70 peratus kematian kebakaran e-basikal berlaku kerana basikal sedang mengecas betul-betul di sebelah pintu keluar satu-satunya apartmen itu. Simpan dan cas bateri mikromobiliti di luar rumah di bangsal yang berasingan jika boleh, atau di dalam bilik berasingan dengan pintu boleh ditutup dan tingkap yang jauh dari laluan keluar hadapan anda.
• Peraturan Pengecasan Selamat yang Ketat untuk Mobiliti Mikro:
• Hanya beli e-basikal yang disahkan UL 2849 dan e-skuter yang disahkan kepada UL 2272 oleh makmal ujian bertauliah (UL, ETL/Intertek, atau CSA).
• Gunakan hanya pengecas pengeluar asal yang tepat: Jangan sekali-kali menggunakan pengecas "universal" selepas pasaran atau palamkan pengecas 54.6V (48V nominal) ke dalam pek bateri 42V (36V nominal); lebihan voltan memintas perlindungan sel dan menjamin letupan ganas dalam masa 30 minit.
• Jangan sekali-kali mengecas tanpa pengawasan semasa tidur atau selepas meninggalkan rumah.
• Wait 60 minutes after riding before plugging in, and never charge below 0 C (32 F): Let a hot battery cool down to room temperature after a ride, and let a freezing winter battery warm up above 5 to 10 degrees Celsius (41 to 50 degrees Fahrenheit) indoors for two hours before connecting the charger to prevent lithium plating dendrites.
• Never buy "rebuilt," second-hand, or tape-wrapped battery packs, and retire any e-bike battery immediately if the bike takes a hard crash onto pavement or is ridden through deep puddles above the bottom bracket.

3. Kenderaan Elektrik (EV), Hibrid dan Dinding Penyimpanan Suria Rumah (10,000 hingga 100,000+ Wj)¶

• Home garage EV or solar wall anomaly: If an EV parked in your attached garage or a garage-mounted lithium-ion solar storage battery (such as a Powerwall or Enphase/LG wall unit) begins making popping sounds, hissing, or emitting sweet chemical odors or white smoke:
• Do NOT open the overhead garage door and walk inside the smoke-filled garage to unplug the car or move it.
• Evacuate every person and pet out of the house immediately, closing the heavy fire-rated door between the house and the garage firmly behind you.
• Call 911 from across the street and stay at least 30 meters (100 feet) upwind.
• Saltwater and flood submersion danger: If a hurricane storm surge, coastal flood, or deep freshwater flood submerges the lower chassis of an EV, plug-in hybrid, golf cart, or e-bike, treat the vehicle as a live incendiary bomb for the next 30 days. Conductive saltwater penetrates battery pack breathers and corrodes high-voltage busbars, causing violent spontaneous thermal runaway fires days or weeks after the floodwaters have completely dried up. Never park a flood-exposed EV inside a garage or within 15 meters (50 feet) of any house, building, or other vehicle until a certified high-voltage dealership technician inspects and drains the traction pack.

4. Commercial Aircraft and Passenger Train Cabin Emergencies¶

If you are flying on an airliner or riding a high-speed train and a smartphone, tablet, power bank, or vape becomes hot, starts smoking, or slips down inside the seat cushions:

• If your phone drops into an adjustable airline seat mechanism: DO NOT MOVE THE SEAT: Modern business-class lie-flat seats and economy reclining seats contain heavy steel scissor levers that crush a trapped smartphone like a hydraulic press if you slide or recline the seat, making seat-jammed phones the #1 cause of in-flight lithium-ion fires. Leave the seat completely still and press the flight attendant call button immediately so crew can lift the seat cushion off safely.
• If a device smokes or ignites in flight: Shout for a flight attendant immediately. Do not throw a burning device on the floor or smother it under pillows/blankets. Cabin crew are trained under FAA / EASA SAFO protocols to put on heat-resistant gloves, knock down any fabric flames with a Halon 1211 extinguisher, immediately pour liters of plain water, soda, coffee, or juice directly onto the smoking device to cool the cells below thermal runaway temperature, and place the drowned device inside a water-filled containment bucket or specialized thermal containment bag monitored until landing.

Soalan lazim¶

Sumber disemak¶

• National Fire Protection Association (NFPA, United States): Lithium-Ion Battery Safety, Micromobility (E-Bike and E-Scooter) Fire Safety, and Alternative Fuel Vehicles Emergency Field Guide.
• UL Research Institutes (UL Solutions / Fire Safety Research Institute, United States): Understanding Lithium-Ion Battery Thermal Runaway, Gas Toxicity, and UL 2849 / UL 2272 Certification Standards.
• Federal Aviation Administration (FAA, United States) and European Union Aviation Safety Agency (EASA): SAFO 09013 / PackSafe Guidance on Fighting In-Flight Lithium-Ion Battery Fires in Aircraft Cabins using Halon and Water.
• London Fire Brigade and National Fire Chiefs Council (United Kingdom): #ChargeSafe E-Bike and E-Scooter Thermal Runaway, Vapor Cloud Deflagration, and Escape Route Protection Guidance.
• National Institute for Occupational Safety and Health (NIOSH / CDC, United States): Hydrogen Fluoride (HF) Systemic Toxicity and Calcium Gluconate Medical Management Guidelines.

Panduan berkaitan¶

• What to do after a car crash (EV battery hazards)
• Electrical fire and sparking outlets
• Kitchen fires and grease fires
• Chemical spills and toxic gas leaks
• Severe burns and chemical scalds
• Direktori nombor kecemasan