Nofo'anga 'api 'o e maka fakafoki 'o e mafana hola: Off-Kasa Venting mo e afi¶

'Oku 'omi 'e he ngaahi sisitemi tanaki'anga ivi 'o e ngaahi maka 'o e nofo'anga (BESS) 'oku fokotu'u 'i he ngaahi fale tau'anga me'alele 'oku fakapipiki, basements, mo e ngaahi 'a 'o e utility 'i tu'a 'a e ivi 'uhila fakafetongi ka 'oku ne fakafe'iloaki mai 'a e ngaahi fakatu'utamaki electrochemical lahi lolotonga 'a e hola 'a e mafana. Ko e ngaahi sisitemi nofo‘anga fakaeonopōní ‘oku fa‘a tauhi ai ‘a e houa ‘uhila ‘e 10 ki he 30 ‘i he ngaahi selo lithium-ion ‘e laungeau. 'I he taimi 'oku fakangaloku ai 'e he ngaahi kovi 'o e ngaohi'anga koloa 'i loto, dendrite nounou-circuits, uesia fakamisini, pe inverter charger overvoltage 'a e angatonu 'o e selo, 'oku kamata ha tali kemikale 'oku 'ikai lava ke mapule'i 'a e vela 'o e self 'i loto 'i he puha 'o e maka.

Ko e hola 'a e mafana ko ha cascade kemikale exothermic 'a ia 'oku fakautuutu ai 'a e mafana 'o e selo 'i loto 'i he exponentially 'i he ngaahi tu'unga 'oku laka hake 'i he ngaahi tikili 'e laungeau 'i he miniti. 'I he mafana 'o e 'ea 'oku mahulu hake 'i he ngaahi 'aofi kemikale mahu'inga, 'oku decomposes 'a e la'i 'o e electrolyte fefeka (SEI), 'o tukuange 'a e ngaahi solvents 'o e 'okani 'oku 'ikai ke 'i ai ha 'uhinga 'oku vaporize 'i he malumalu 'o e 'omi lahi. Ko e malu'i 'o e pa 'a e tisiki 'o e selo 'oku fakatu'utamaki ruptures, venting ha dense, pressurized 'o e kasa plume 'oku 'i ai 'a e haitoloseni, kaponi monokisaiti, methane, mo e kona 'o e haitoloseni fluoride ki he loki 'oku tapuni.

'Oku fakatupu 'e he 'i ai 'a e plume off-kasa ko 'eni ha fakatu'utamaki vave 'o e fakamanamana 'e ua 'oku kau ai 'a e kona kemikale 'o e 'uto mo e deflagration 'o e 'ao 'o e kohu fakatu'utamaki. Kapau 'oku tanaki 'a e fefiofi 'o e kasa vela 'i loto 'i ha fale tau'anga me'alele pe basement 'oku 'ikai ke 'ea 'o 'ikai ha tutu vave, 'e lava ke tutu 'e ha ulo 'oku 'alu hala mei ha switch 'uhila pe relay 'a e 'ao, 'o fakatupu ha pahū 'oku malava ke ne puhi'i 'a e ngaahi 'ā 'i tu'a. ‘I he taimi ‘oku hoko ai ‘a e tutu ‘i he taimi pē ko iá, ‘oku vela ‘a e afí ko ha maama mālohi, ‘oku ne faka‘auha pē ‘e ia ia ‘a ia ‘oku tō mei he sela ki he sela ‘i he kotoa ‘o e puha. Ko hono maluʻi ho fāmilí ʻoku fie maʻu ke ʻiloʻi vave ʻa e ngaahi fakaʻilonga fakatokanga ʻoku ʻasi ʻi he leʻó mo e ongoʻí, fetukutuku vave ʻi he matangí, mo e fetuʻutaki vave mo e kau ngāue tamate afi kuo akoʻi ʻe he hazmat ʻa e koló.

Fai ʻeni he taimí ni .¶

1. Fakaʻauha ʻa e kau nofo kotoa pē mo e fanga monumanu mei he ʻapí ʻi he taimi pē ko iá, ʻo ʻunu ʻo ʻikai siʻi hifo ʻi he mita ʻe 30 (fute ʻe 100) ʻi ha tafaʻaki ʻoku ʻalu hake mo ʻalu hake mei he faʻunga ʻo e ʻapí.
2. Ta ki ho'o fika fakavavevave fakalotofonua (911 'i he 'Iunaiteti Siteiti mo Kanata, 112 'i he kotoa 'o e 'Iunioni 'Iulope, 999 'i he Pule'anga Fakatahataha) pea fakaha: "Nofo'anga lithium-ion 'a e sisitemi tanaki'anga 'o e maka 'i he thermal runaway mo e kona 'o e off-gassing mo e fakatu'utamaki 'o e pa", referencing . ngaahi fika fakavavevave.
3. Tāpuniʻi ʻa e ngaahi matapā kotoa ʻi loto mo tuʻa ʻi ho tuʻá lolotonga ʻa e fetukutuku ke fakavahevaheʻi ʻa e hiki ʻa e kasa kona ki he ngaahi feituʻu nofoʻangá.
4. Lafo 'a e 'uhila vave 'o e tapuni fakavavevave 'i tu'a pe 'uhila 'o e la'aa DC disconnect 'o kapau pe 'oku fokotu'u ia 'i tu'a, malu 'i he matangi, pea mahino mei he loki 'o e 'uhila.
5. Fakatokanga vave ki he ngaahi kaungāʻapi ʻoku ʻalu hifo ʻa e matangí ke nau mavahe pe malu ʻi ha feituʻu ʻoku tāpuni ʻa e ngaahi matapā sioʻatá mo e ngaahi sisitemi ʻeá ke fakaʻehiʻehi mei he ʻuʻulu kona ʻo e haitoloseni fluoride.
6. Ta’ofi ‘a e toe hū kotoa ki he ngaahi fale ‘i ha fa’ahinga tu’unga pē kae ‘oua kuo fakamo’oni’i ‘e he kau ngāue tamate afi ‘a e kolomu’á kuo ngata faka’aufuli ‘a e me’a na’e hoko ‘i he māfaná pea fakapapau’i ‘e he sivi ‘o ​​e ‘eá ‘a e ‘ea malu.
7. Fetaulaki mo e kau tali fakavavevave 'oku nau a'u mai 'i he perimeter 'o e hala 'o e me'alele mo e hingoa 'o e kautaha ngaohi 'o e ngaahi maka, kemikale, mo e malava ke tanaki 'i he kilowatt-houa.

Flowchart tali fakavavevave 'o e hola 'a e mafana¶

flowchart TD
    A["Ngaahi Leʻo Hissing, Namu Kemikale Melie, pe Kohu Hinehina ."] --> B["Faka'ilonga'i 'a e me'a 'oku hoko 'i he Nofo'anga 'o e Off-Kasa"]
    B --> C["Faka'auha 'a e Kau Nofo Kotoa 'i he Matangi 'i he taimi pe ko ia"]
    C --> D["Tāpuni ʻa e Ngaahi Matapā ʻi Ho Tuʻá ke Fakatuaiʻi ʻa e Mafola ʻo e Kasá"]
    D --> E["Ta mai ki he Fika Fakavavevave pea Lipooti e Vela Lithium ESS ."]
    E --> F{"'Oku Malu 'a e Switch 'o e Shutdown 'i tu'a?"}
    F -->|"‘Io, Malu ‘a e Matangi"| G["Folau Tu'a Fakavavevave Motuhi 'a e Suisi"]
    F -->|"'Ikai, Ofi ki he Paati pe Matangi Hifo"| H["Bypass Suisi: Tauhi Malu 30m Mama'o"]
    G --> I["Fakatokanga ki he Kaunga'api 'o e Matangi Lalo 'o e Plume 'o e Kasa Kona"]
    H --> I
    I --> J["Fetaulaki mo e kau Tamate Afi 'oku nau a'u mai 'i he Perimeter 'o e Hala"]
    J --> K["'Oatu 'a e kemikale 'o e maka, kWh, mo e feitu'u 'o e Pack ."]
    K --> L["Fokotuʻu ʻe he Kau Ngāue Tāmate Afí ha ʻOhofi Hokohoko ʻo e Fakamokomokoʻi ʻo e Vaí"]

Kemisi 'uhila mo e thermodynamics 'o e hola 'o e mafana .¶

Ko e mahino ki he mamafa 'o e ngaahi fakatu'utamaki 'o e ngaahi maka 'o e nofo'anga 'oku fie ma'u ke sivisivi'i 'a e electrochemistry 'i loto 'o e ngaahi sisitemi tanaki'anga ivi fakaonopooni. 'Oku fakafalala 'a e tanaki'anga 'o e ivi 'o e nofo'anga ki he tekinolosia 'o e litiume-ion, 'o faka'aonga'i tefito 'a e litiume nikele manganesi kopaleti 'okisaiti (NMC) pe litiume ukamea phosphate (LFP) kemikale. 'Oku kau 'i he selo takitaha ha cathode lelei, ha anode kalafi kovi, ha 'elekituloniti 'o e vai 'o e 'okani 'oku 'i ai 'a e ngaahi masima 'o e litiume hexafluorophosphate (LiPF6) 'oku fakamovetevete, mo ha membrane fakamavahe'i 'o e polymeric microporous 'oku fua 'aki 'a e 15 ki he 25 maikolomita 'i he matolu.

Lolotonga e ngaahi siakale 'o e totongi angamaheni, 'oku deintercalate 'a e ions 'o e litiume mei he lattice sio'ata cathode, hiki 'i he electrolyte vai, pea fakahu 'i he vaha'a 'o e ngaahi la'i graphite 'i he anode. 'I he taimi 'oku faka'ata ai, 'oku fakatupu 'e he founga fakafepaki 'a e 'uhila lolotonga. 'Oku fakafalala kakato 'a e tu'unga fakakemikale ko 'eni 'i he angatonu fakatu'asino 'o e polymeric separator, 'a ia 'oku ne ta'ofi 'a e fetu'utaki fakahangatonu 'a e 'uhila 'i he vaha'a 'o e electrodes lelei mo e kovi.

'Oku kamata 'a e hola 'a e mafana 'o fakafou 'i he ngaahi founga ngaue kovi 'e tolu 'o e tefito'i: ngaue kovi 'aki 'a e 'uhila ('overcharging, overdischarging, pe ngaahi sēketi nounou 'i tu'a), ngaue kovi 'a e mafana ('overheating 'o e 'atakai pe 'oku 'asi mai 'a e afi 'i he tafa'aki), mo e ngaue kovi fakamisini (dendrites ngaohi'anga koloa 'i loto, puncture fakatu'asino, pe compression fakafa'unga).

Thermal Stage               Temperature Range                Chemical Reaction
---------------------------------------------------------------------------------
Stage 1: SEI Breakdown      80 C to 120 C (176 F to 248 F)   Solid electrolyte interphase decomposes
Stage 2: Anode Reaction     120 C to 150 C (248 F to 302 F)  Intercalated lithium reacts with solvent
Stage 3: Separator Melting  130 C to 170 C (266 F to 338 F)  Polyethylene/polypropylene membranes melt
Stage 4: Cathode Collapse   150 C to 230 C (302 F to 446 F)  Oxygen liberation and self-oxidation
Stage 5: Violent Venting    > 250 C (> 482 F)                Pressure disc rupture, off-gas deflagration

'Oku kamata 'a e siteisi 1 'i he vaha'a 'o e 80 mo e 120 tikili Selisiasi (176 mo e 248 tikili Fālenihai), 'a ia 'oku 'auha ai 'a e passivating 'o e 'uhila fefeka 'o e interphase (SEI) 'i he anode 'o e kalafi 'o e exothermically. 'Oku fakahaa'i 'e he decomposition ko 'eni 'a e graphite lithiated 'ata'ata pe ki he ngaahi solvents 'o e carbonate 'o e 'okani, 'o fakatupu 'a e ngaahi kasa vela mo hono hiki hake 'o e mafana 'o e selo 'i loto.

'I he Siteisi 2, 'i he vaha'a 'o e 120 mo e 150 tikili Selisiasi (248 mo e 302 tikili Fahrenheit), 'oku vave ange 'a e tali 'o e anode, 'o fakalahi 'a e 'omi 'o e selo 'i loto. Lolotonga e Siteisi 3, 'i he vaha'a 'o e 130 mo e 170 tikili Selisiasi (266 mo e 338 tikili Fahrenheit), 'oku vaia 'a e polymeric separator mo e holo, 'o fakatupu 'a e mafola 'a e ngaahi sēketi nounou 'i loto.

'Oku 'auha 'a e cathodes 'o e oxide ukamea 'o e liliu lolotonga 'a e Siteisi 4 'i he vaha'a 'o e 150 mo e 230 tikili Selisiasi (302 mo e 446 tikili Fahrenheit), 'o fakatau'ataina'i 'a e 'osikena 'atomi ki he electrolyte. 'I he kemikale 'o e NMC, 'oku fakatupu 'e he tukuange 'o e 'osikena 'i loto ko 'eni ha oxidizer 'i loto, 'o fakatolonga 'a e combustion 'o 'ikai ha 'ea 'o e 'ea. ‘Oku ‘alu hake ‘a e māfaná ‘o fakalaka ‘i he tikilī Selisiasi ‘e 800 (tikilī Fālenihaiti ‘e 1,472) ‘i ha ngaahi sekoni, ‘o faka‘uli ai ‘a e selá ki he Siteisi 5: ko e ‘ea fakamālohi mo e mafola ‘a e māfaná ki he ngaahi sela kaungā‘apí.

Kemikale 'o e to'utangata 'o e off-kasa mo e fa'unga 'o e plume kona¶

Ko e fakatu'utamaki lahi taha 'o e malu 'o e mo'ui lolotonga 'a e ngaahi miniti 'o e fakaava 'o e nofo'anga 'o e 'uhila thermal runaway ko e tukuange vave 'o e kona, flammable off-kasa. Kimu'a pea toki 'asi mai 'a e ulo 'o e 'ata, 'oku fakamālohi'i 'e he 'omi 'i loto 'a e 'ea malu'i 'o e selo ke rupture, discharging dense hinehina pe hina aerosol vapors ki he feitu'u fokotu'u.

Ko e plume 'o e kasa ko 'eni ko ha fefiofi kemikale faingata'a 'oku ngaohi 'e he faka'auha 'o e mafana 'o e ngaahi me'a faka'auha 'o e carbonate 'o e 'okani, ngaahi me'a fakapipiki polymeric, mo e fluorine-'oku 'i ai 'a e ngaahi masima 'o e electrolyte. 'Oku angamaheni 'aki 'a e matrix 'o e solvent 'a e 'etileni kaponi (EC), dimethyl kaponi (DMC), mo e 'etileni metili kaponi (EMC). 'I he lalo pyrolysis malohi, 'oku movete 'a e ngaahi molecules ko 'eni ki he ngaahi kasa vela 'o e molecules-mamafa ma'ulalo:

Gas Component           Volumetric Fraction in Off-Gas   Combustion / Toxicity Characteristics
---------------------------------------------------------------------------------
Hydrogen (H2)           20% to 35% by volume             LFL 4%, UFL 75%, extreme flame speed
Carbon Monoxide (CO)    15% to 30% by volume             LFL 12.5%, UFL 74%, chemical asphyxiant
Methane (CH4)           5% to 15% by volume              LFL 5%, UFL 15%, simple asphyxiant
Ethylene (C2H4)         2% to 8% by volume               LFL 2.7%, UFL 36%, volatile hydrocarbon
Carbon Dioxide (CO2)    15% to 30% by volume             Non-flammable inert diluent
Hydrogen Fluoride (HF)  50 to 500 parts per million      Severe acute toxin, IDLH 30 ppm
Phosphoryl Fluoride     10 to 50 parts per million       Hydrolyzes into HF and phosphoric acid

'Oku a'u ki he peseti 'e 35 'o e kasa haitoloseni 'o e voliume fakakatoa 'o e off-gas. 'Oku ma'u 'e he haitoloseni ha flammability makehe 'a e lahi, igniting 'i he ngaahi me'a 'i he vaha'a 'o e peseti 'e 4 mo e 75 'i he 'ea. 'Oku 'i ai ha ivi 'o e ignition si'isi'i taha 'aupito 'o e 0.017 millijoules pe, 'uhinga 'e lava ke fakatupu 'e he static 'a e faka'ata mei he ngaahi kofu pe relays fakamisini 'a e ignition vave.

'I he taimi tatau, 'oku fakatupu 'e he 'auha 'o e mafana 'o e litiume hexafluorophosphate (LiPF6) 'a e masima 'o e 'uhila 'o e kasa 'o e haitoloseni fluoride (HF). 'I he taimi 'oku fetu'utaki ai 'a e LiPF6 'oku ne muimui'i 'a e 'ea 'o e 'atakai, 'oku ne hydrolyzes ki he phosphorus pentafluoride mo e 'ikai ha vai 'o e haitoloseni 'o e 'ea. Ko e haitoloseni fluoride ko ha kona faka‘auha, ‘oku hū ki he protoplasmic.

‘I he ngaahi tu‘unga ‘oku laka hake ‘i he konga ‘e 30 ‘i he milioná (ko e tu‘unga ‘o e Fakatu‘utāmaki Fakavavevave ki he Mo‘uí pe Mo‘ui Leleí), ‘oku fakatupunga ai ‘e he haitoloseni fluoride ‘a e ngaahi vela fakakemikale lahi ki he halanga mānavá, edema ‘o e mafú, mo e faka‘auha ‘o e matá. 'Oku ha'i 'a e ngaahi 'aione 'o e fluoride 'o e sisitemi 'oku to'o mo e kalasiume mo e magnesium 'i he toto 'o e tangata, 'o precipitating ki he kalasiume fluoride 'oku 'ikai ke lava 'o fakamovetevete. Ko e fakasi‘isi‘i fakafokifā ko eni ‘o e kalasiume ‘i he totó ‘okú ne fakatupunga ‘a e ngaahi mahaki ‘o e lotó, ventricular fibrillation, mo e puke fakatupu mate ‘o e lotó. Ko e mānava ‘o e kasa ‘o e pātí na‘a mo ha ngaahi sekoni si‘i ‘e lava ke fakatupu mate.

Ngaahi fakatu'utamaki 'o e deflagration mo e pa 'a e 'ao 'o e kohu .¶

'Oku 'omi 'e he 'ulungaanga fakatu'asino 'o e nofo'anga 'o e maka 'o e off-kasa 'i loto 'i ha loki 'oku tapuni ha fakatu'utamaki 'o e pa 'a e structural 'aupito. ‘I he ngaahi fokotu‘utu‘u nofo‘anga lahi, ‘oku fokotu‘u ai ‘a e ngaahi sisitemi tauhi‘anga ivi ‘o ​​e ngaahi pātí ‘i loto ‘i he ngaahi fale tau‘anga me‘alele ‘oku fakapipiki ki aí, ngaahi loki ‘o e ngaahi me‘angāué, pe ngaahi loki ‘i lalo ‘oku ‘osi ‘osi. Ko e ngaahi 'atakai 'oku tapuni ko 'eni 'oku 'ikai ha 'ea 'o e 'ea fakamisini 'o e voliume ma'olunga.

‘I he taimi ‘oku hū ai ha pātí ki he thermal runaway ‘o ‘ikai ha tutu vave ‘o e afí, ‘okú ne faka‘atā ‘i he vaha‘a ‘o e lita ‘e 500 mo e 1,500 (fute kiupiki ‘e 18 ki he 53) ‘o e kasa vela ‘i he kilowatt-houa ‘o e ivi ‘o ​​e tanaki‘angá. Ki ha tu'unga 13.5 kilowatt-houa 'o e maka 'o e nofo'anga, 'oku fakakatoa 'a e to'utangata 'o e kasa 'o e 7,000 ki he 20,000 lita (247 ki he 706 cubic fute) 'o e kasa lolo fakatahataha'i 'i loto 'i ha ngaahi miniti.

'Oku fakafonu vave 'e he voliume kasa ko 'eni 'a e loki, 'o fefiofi mo e 'osikena 'o e 'ea 'o e ambient ke fa'u ha 'ao lahi 'o e stoichiometric lolo-'ea. Ko e konga haitoloseni ma'ama'a ange 'i he 'ea 'oku hake ia ki he silingí, lolotonga ia 'oku mamafa ange 'a e ngaahi kohu 'o e carbonate 'o e 'okani mo e pool 'o e kaponi monokisaiti 'i he ngaahi tu'unga 'o e faliki.

+-------------------------------------------------------------+
|               VAPOR CLOUD EXPLOSION PROGRESSION             |
|                                                             |
|   Phase 1: Cell Venting -> Off-gas fills enclosed room      |
|   Phase 2: Gas-Air Mixing -> Reaches Lower Flammable Limit  |
|   Phase 3: Ignition Source -> Relay, switch, or hot cell    |
|   Phase 4: Deflagration -> Overpressure wave (0.2 - 0.5 bar)|
|   Phase 5: Structural Failure -> Walls blow out, roof lifts |
+-------------------------------------------------------------+

Kapau 'oku fakalele ha ma'u'anga ivi, hange ko ha fakaava 'otometiki 'o e matapa 'o e fale tau'anga me'alele, relay 'o e compressor 'o e fō, pe ko e 'uhila 'o e maama, 'oku tutu 'a e 'ao 'o e kohu 'i ha deflagration fakamālohi. 'Oku vave 'a e vave 'o e ulo 'o e combustion 'i he geometry fakangatangata, 'o fakatupu 'a e overpressures lahi 'i he vaha'a 'o e 0.2 mo e 0.5 pa (2.9 ki he 7.3 pauni 'i he 'inisi tapafā).

Ko ha overpressure static 'o e pa 'e 0.1 pe (pauni 'e 1.45 ki he 'inisi tapafā) 'oku fe'unga ia ke ne motuhi 'a e ngaahi matapa sio'ata 'o e nofo'anga, buckle 'a e ngaahi vahevahe drywall, pea puhi'i 'a e ngaahi matapa 'o e fale tau'anga me'alele mei honau ngaahi hala. Ko e ngaahi fu'u 'omi 'oku laka hake 'i he 0.3 pa (pauni 'e 4.35 ki he 'inisi tapafā) 'oku ne fakatupu 'a e ta'elavame'a fakatu'utamaki 'o e ngaahi langa, shearing 'a e ngaahi 'aofi 'o e fungavaka mei he ngaahi peleti 'o e 'a mo e holo 'a e ngaahi 'a 'o e masonry 'oku 'ikai ke fakamālohia. Kuo fakatohi 'e ha ngaahi me'a fakavaha'apule'anga lahi 'o e tamate afi 'a e ngaahi lavea lahi ki he kau ngaue fakavavevave 'oku fakatupu 'e he ngaahi deflagrations 'o e kasa 'o e battery off-gas 'oku ne puhi'i 'a e ngaahi matapa 'o e fale tau'anga me'alele.

Malu 'o e kemikale 'o e maka mo e ngaahi fakangatangata 'o e hola 'a e mafana¶

'Oku faka'aonga'i 'e he ngaahi sisitemi tanaki'anga ivi 'o e nofo'anga 'a e ngaahi kemikale kehekehe 'o e ngaahi maka 'oku nau fakahaa'i 'a e 'ulungaanga kehekehe 'aupito 'o e thermal runaway, ngaahi voliume 'o e to'utangata 'o e kasa, mo e ngaahi fakatu'utamaki 'o e mafola 'o e afi. 'Oku fakafehoanaki 'e he tepile 'i lalo 'a e ngaahi kemikale angamaheni 'o e tanaki'anga nofo'anga.

'Oku 'omi 'e he litiume nikele manganese kopaleti (NMC) 'a e density makehe 'o e ivi volumetric, 'o 'ai ke faka'aonga'i lahi ia 'i he ngaahi maa'imoa 'o e 'a 'o e nofo'anga 'o e compact. Ka neongo ia, 'oku ma'u 'e he NMC 'a e mafana ma'ulalo taha 'o e kamata'anga 'o e thermal runaway (150 ki he 180 tikili Selisiasi) pea tukuange 'a e voliume ma'olunga taha 'o e kona 'o e off-kasa. Ko e me'a mahu'inga, 'oku fakatau'ataina'i 'e hono fokotu'utu'u cathode 'a e 'osikena 'i he lalo holo 'o e mafana, 'o fakatupu 'a e combustion 'oku ne fakatolonga 'e ia ia.

Kuo 'asi mai 'a e Lithium ukamea Phosphate (LFP) ko e kemikale nofo'anga manakoa ki he ngaahi fokotu'utu'u 'oku fakatefito 'i he malu. 'Oku fie ma'u 'e he covalent malohi 'o e phosphorus-'osikena 'i he fokotu'utu'u 'o e sio'ata 'o e olivine 'a e ivi 'o e mafana 'oku ma'olunga ange 'aupito ke decompose (210 ki he 270 tikili Selisiasi) pea 'oku 'ikai ke ne tukuange 'a e 'osikena faingofua. Lolotonga e ngaahi maa'imoa LFP 'oku lahi ange 'a e tu'uma'u mo fakafepaki'i 'a e self-ignition, kuo pau ke 'ilo'i 'e he kau ma'u 'api 'oku kei vent 'a e ngaahi selo LFP 'a e ngaahi voliume mamafa 'o e kona, flammable hydrogen mo e kaponi monokisaiti lolotonga 'a e vela 'i tu'a pe mate-nounou 'a e ngaahi ta'elavame'a.

Off-kasa kemikale kona mo e pahū fakangatangata matrix .¶

'Oku 'omi 'e he ngaahi koloa 'o e vela mo e ngaahi kohu 'o e kasa 'oku 'ikai ke 'i ai ha 'uhinga 'oku tukuange mai lolotonga 'a e hola 'a e mafana 'o e maka 'a e ngaahi fakatu'utamaki physiological mo e pa 'oku fu'u lahi. 'Oku fakahaa'i 'e he tepile 'i lalo 'a e ngaahi fa'ahinga kemikale mahu'inga, ngaahi thresholds 'o e toxicity, mo e ngaahi fakangatangata 'o e pahū.

'Oku 'omi 'e he haitoloseni fluoride (HF) 'a e fakamanamana fakafaito'o fakapulipuli taha lolotonga 'a e ngaahi me'a 'oku hoko 'i he ngaahi 'uhila. 'Oku kehe mei he kohu angamaheni 'oku 'i ai 'a e ngaahi momo'i me'a 'o e kaponi, 'oku 'ikai ke 'asi 'a e kasa HF pea 'e lava ke ne hū ki he ngaahi me'angaue turnout 'o e tamate afi 'o e structural angamaheni. 'Oku tali 'e he moisture 'i he kili sweaty mo e kasa HF ke fa'u 'a e hydrofluoric 'esiti, 'a ia 'oku paasi ta'e-mamahi 'i he ngaahi la'i kili kimu'a pea toki 'ohofi 'a e ngaahi ngata'anga loloto 'o e neave mo e kalasiume 'o e hui.

'Oku a'u 'a e ngaahi tu'unga 'o e kaponi monokisaiti lolotonga 'a e nofo'anga 'o e 'uhila thermal runaway ki he ngaahi fakakaukau 'oku laka hake 'i he 10,000 konga 'i he miliona 'i he ngaahi feitu'u 'oku tapuni. Ko ha mānava pē ‘e taha ‘o e ‘eá ‘oku ‘i ai ‘a e 10,000 ppm CO ‘okú ne fakatupu ‘a e ta‘e‘ilo‘ilo pau ‘i loto ‘i he mānava ‘e ua ki he tolu, ‘o ta‘ofi ai ‘a e mavahe meiate kitautolú.

Potokala tali fakavavevave fakasitepu 'i he nofo'anga¶

'I he taimi 'oku fakahaa'i ai 'e ha sisitemi tauhi'anga 'o e ngaahi 'api 'a e ngaahi faka'ilonga 'o e faingata'a'ia 'i he mafana, kuo pau ke fakahoko 'e he kau ma'u 'api ha tali fakavavevave vave, fakamu'omu'a. Ko e ngaahi konga fakatakimu'a ko 'eni 'oku fakamu'omu'a 'a e malu 'o e mo'ui vave mo e to'oto'o fakapalofesinale.

Konga 1: ʻIloʻi ʻo e fakatokanga vave mo e fakatokanga vave¶

Ko hono ‘ilo‘i ‘o e thermal runaway ‘i hono tu‘unga vave tahá ‘okú ne fakahaofi ‘a e mo‘uí. Tokanga lahi ki he ngaahi fakaʻilonga fakatokanga fakaʻatamaí: - Acoustic cues: Ko ha le‘o ‘o e whistling mā‘olunga, kiliki vave, pe ko ha longoa‘a hissing māsila ‘oku hangē ha hū‘anga pneumatic ‘oku mā‘olunga hono mīsiní ‘okú ne fakahaa‘i ‘a e movete ‘a e tisiki pa ‘o e selá. - Ngaahi faka'ilonga 'o e ongo: Ko ha nanamu kemikale melie, hange ha 'asetoni (evaporating 'o e carbonates 'o e 'okani) pe ko ha nanamu ika 'oku 'ikai ke 'i ai ha 'uhila, 'oku ne fakahaa'i 'a e movete 'o e electrolyte. - Ngaahi fakaʻilonga fakaʻata: Ko e kohu hinehina matolu pe hina maʻamaʻa ʻoku ʻalu hake mei he ngaahi tuitui ʻo e kapineti ʻo e pātí, ʻo fakalahi vave atu ki he silingí.

ʻOua naʻá ke teitei fakatotoloʻi ofi ʻa e kapineti ʻo e pātí. Kaila leva ha fakatokanga fetukutuku ongo ki he kau mēmipa kotoa ʻo e ʻapí. ʻOua naʻá ke fakamoleki ha taimi ʻi he kumi ʻo e ngaahi meʻa fakatāutahá pe feinga ke tā ʻa e ngaahi meʻangāué.

Konga 2: Fetuku vave mo e fakamavaheʻi ʻo e ngaahi falé¶

Fakaʻauha ʻa e kau mēmipa kotoa ʻo e fāmilí mo e fanga monumanu ʻi he matapā ofi taha ʻi tuʻa ʻoku ʻalu hangatonu ki tuʻá. Kapau ʻoku fokotuʻu ʻa e pātí ʻi ha fale tauʻanga meʻalele ʻoku fakapipiki ki ai, ʻoua naʻá ke teitei fakaava ʻa e matapā ʻi he vahaʻa ʻo e ʻapí mo e fale tauʻanga meʻalelé ke ke sio ki loto.

ʻI hoʻo hū ki tuʻá, tāpuniʻi e matapā kotoa pē ʻi lotó ʻi ho tuʻá. Ko hono tāpuniʻi ʻo e ngaahi matapā ʻi lotó ʻokú ne fakatupu ha ngaahi ʻā vahevahe fakatuʻasino ʻo e loki ʻoku ne fakatuaiʻi ʻa e hiki ʻo e kasa kona ʻo e off-mo e kohu ki he ngaahi feituʻu nofoʻangá, ʻo fakatolonga ʻa e ngaahi halanga ʻo e fetukutuku.

ʻI hoʻo ʻi tuʻá, hiki ʻo ʻikai siʻi hifo he mita ʻe 30 (fute ʻe 100) mei he ʻapí. Fakamo'oni'i 'oku tu'u ho'o feitu'u fakataha'anga 'o e fetukutuku 'i he matangi mo e 'olunga mei he fa'unga. 'Oku 'i he ngaahi plumes 'o e kasa 'o e 'ikai ha ngaahi mata'itofe aerosolized matolu 'oku ngoto ki he feitu'u ma'ulalo pe puhi hangatonu 'i he matangi.

Konga 3: Fakatokanga ki he ngaahi sevesi fakavavevave mo e fakamavahe'i 'o e ngaahi me'angaue¶

Ta ki he ngaahi ngāue fakavavevavé ʻi he taimi pē ko iá mei ha mamaʻo malu ʻi tuʻa. 'Oatu ha lipooti fakangaue pau mo fakatekinikale ki he tokotaha 'oku ne fakahoko 'a e 911: - Fakaha 'oku ke ma'u ha sisitemi tanaki'anga 'o e lithium-ion 'o e maka nofo'anga 'oku lolotonga lele 'i he thermal runaway. - Fakapapau'i 'a e kemikale 'o e maka kapau 'oku 'iloa (NMC pe LFP), 'a e kautaha ngaohi, mo e malava 'o e sisitemi 'i he kilowatt-houa. - Fakapapau'i pe 'oku vela malohi 'a e maka pe venting 'a e ngaahi 'ao kohu hinehina 'o e off-gas. - Fakaha pe ʻoku kei ʻi ai ha taha ʻi loto ʻi he faʻunga.

Kapau 'oku 'asi 'i ho 'api ha tu'a Fakavavevave 'o e Shutdown Switch pe solar/battery DC disconnect 'oku fokotu'u 'i ha 'ā 'i tu'a 'i tu'a malu 'o mama'o mei he loki 'o e 'uhila, fononga 'a e switch ki he tu'unga OFF. 'Oku fakamavahe'i 'e he me'a ni 'a e 'uhila mei he solar array 'o e fungavaka mo e panel 'uhila 'o e 'api tefito. Kae kehe, kapau ʻoku tuʻu ʻa e switch motuʻá ʻi loto ʻi he fale tauʻanga meʻalelé, loki ʻi lalofonuá, pe ʻi he matangi ʻi lalo ʻi he ʻuʻulu ʻo e kohu, ʻoua naʻá ke feinga ke aʻu ki ai.

Konga 4: Fakatokanga 'o e matangi hifo mo e talitali 'o e kau tali¶

Lue ki he ngaahi ʻapi kaungāʻapi ofi mai ʻoku tuʻu hangatonu ʻi he tafaʻaki matangi ʻo hoʻo koloá. Fakahinohinoʻi e kaungāʻapí ke nau mavahe pe malu ʻi ha feituʻu, ʻo tāpuniʻi e ngaahi matapā kotoa pē ʻi tuʻá, ngaahi matapā sioʻatá, mo e ngaahi hūʻanga ʻea foʻou ʻo e HVAC.

Tuʻu koe ʻi he hūʻanga ʻo e halanga meʻalelé ke fakafetaulaki ki he ngaahi meʻangāue tāmate afi ʻoku aʻu maí. ‘I he a‘u mai ‘a e ‘eikitau ‘o e me‘a na‘e hokó, ‘oatu leva: - Ko e feitu'u fakatu'asino pau 'o e 'uhila 'i loto 'i he nofo'anga. - Ko e tu'unga 'o e ngaahi motuhi 'o e 'uhila mo e ngaahi panel 'o e la'aa. - Ko e fakamatala ki he ‘i ai ha ngaahi kasa pe kemikale kehe kuo fakamālohi‘i ‘i he fale tau‘anga me‘alelé (hangē ko e ngaahi tangikē propane pe ngaahi hina penisini).

Ngaahi founga ki hono ta'ofi 'o e sevesi 'o e afi mo e fisiki 'o e tohi kole 'o e vai¶

Ko hono ta'ofi 'o ha afi 'o e sisitemi tanaki'anga ivi 'o e ngaahi maka nofo'anga 'oku fie ma'u 'a e ngaahi founga makehe 'o e tamate afi 'oku kehe 'aupito mei he tamate afi 'o e structural angamaheni. Kuo pau ke mahino ki he kau maʻu ʻapí ʻa e meʻa kuo pau ke fai ʻe he kau ngāue tamate afi ʻoku nau aʻu maí ke nau puleʻi ʻa e fakatuʻutāmakí.

Ko e ngaahi meʻa tāmate afi angamahení, kau ai ʻa e kemikale mōmoa ʻo e Kalasi ABC, kaponi taiʻokisaiti, mo e ngaahi meʻa maʻá, ʻoku ʻikai ke nau lava ʻo tāmateʻi ha vela ʻo e pā litiume-ʻioní. Lolotonga 'e lava ke tuki hifo 'e he kau fakafofonga ko 'eni 'a e ulo 'o e pelesitiki 'i tu'a, 'e 'ikai lava ke nau puke 'a e decomposition kemikale 'i loto 'oku hoko 'i loto 'i he ngaahi selo 'o e maka hermetically sila'i.

Suppression Approach         Physical Mechanism                   Effectiveness Rating
---------------------------------------------------------------------------------
ABC Dry Chemical Powder      Interrupts external flame chemistry  Ineffective: Fails to cool internal cells
Carbon Dioxide (CO2)         Displaces oxygen around cabinet      Ineffective: Battery contains internal oxidizer
Class D Metal Powder         Designed for combustible metals      Ineffective: Lithium-ion is not lithium metal
Low-Volume Garden Hose       Forms hydrogen, spreads HF runoff    Dangerous: Insufficient thermal cooling
High-Volume Copious Water    Massive heat absorption and cooling  Optimal: Only method to arrest propagation

Ko e founga suppression 'aonga pe 'e taha ki he lithium 'o e maka thermal runaway ko e hokohoko atu 'o e faka'aonga'i 'o e ngaahi voliume copious 'o e vai. Ko e vai 'oku 'i ai ha malava makehe 'o e vela pau (4,184 joules ki he kilokalami-tikilī Selisiasi) mo ha vela fakapulipuli lahi 'o e vaporization (2.26 megajoules ki he kilokalami). 'I hono faka'aonga'i 'i he ngaahi voliume ma'olunga, 'oku absorbs 'e he vai 'a e ivi 'o e mafana vave ange 'i he ngaahi selo decomposing 'e lava ke ne fakatupu ia, cooling 'a e ngaahi selo kaunga'api 'i lalo 'i honau thermal runaway threshold.

‘Oku muimui ‘a e ngaahi potungāue tāmate afí ki he fakahinohino ‘a e Kautaha Malu‘i ‘o e Afí Fakafonuá (NFPA), ‘o nau ngāue‘aki ‘a e ngaahi vaitafe hokohoko ‘o e lita ‘e 500 ki he 1,000 ‘i he miniti (kāloni ‘e 130 ki he 260 ‘i he miniti) ‘o fakahangatonu ki he ‘ā ‘o e pātí ‘o ngāue‘aki ‘a e ngaahi fo‘i kakapu ‘oku tuliki lahi. Ko e ngāue fakamokomoko ko ení ‘oku fa‘a fiema‘u ki ai ‘a e lita vai ‘e 10,000 ki he 30,000 (kāloni ‘e 2,600 ki he 7,900) ‘oku ‘oatu ‘i ha houa hokohoko ‘e tolu ki he valu.

‘E fili nai ‘a e kau ngāue tamate afi ‘oku nau a‘u maí ke ‘oua ‘e hū leva ki he fale tau‘anga me‘alelé kapau ‘oku fakatupu ‘e he tānaki ‘o e kasa lahi ha fakatu‘utāmaki ‘o e deflagration ‘oku vave mai. 'E fokotu'u 'e he kau tamate afi ha perimeter malu'i 'i tu'a, ventilating 'a e ngaahi feitu'u 'o e fungavaka pe faka'aonga'i 'a e ngaahi monitoa kelekele 'oku 'ikai ha tangata ke fakamokomoko 'a e 'atakai 'o e 'uhila mei ha mama'o malu 'o e tu'u-me'a.

Me'angaue mo e ngaahi me'angaue malu'i fakafo'ituitui 'o e 'inivenitoli .¶

Ko hono pule'i 'o e perimeter 'o ha me'a 'oku hoko 'i he nofo'anga 'o e 'uhila mo e poupou'i 'o e kau tali 'uluaki 'oku fie ma'u 'a e siofi makehe mo e ngaahi me'angaue malu. Ko e tepile ‘i lalo ‘oku ne fakahokohoko atu ‘a e ngaahi me’angaue ‘oku ngaue’aki lolotonga ‘a e pule’i fakavavevave mo e siofi ‘o e ‘atakai.

Industry codes and installation safety standards¶

Residential battery energy storage systems are subject to comprehensive fire and electrical safety standards developed in response to recent technological advances and field failure data.

The National Fire Protection Association publishes NFPA 855, the Standard for the Installation of Stationary Energy Storage Systems. NFPA 855 establishes strict limits on residential installations: - Individual residential battery units must not exceed a maximum capacity of 20 kilowatt-hours. - Total aggregated system capacity within an attached garage or residential building must not exceed 40 kilowatt-hours (or up to 80 kilowatt-hours in detached structures with proper separation). - Battery enclosures must maintain a minimum physical separation distance of 1.0 meter (3 feet) from other battery units, doors, and operable windows.

Underwriters Laboratories certifies battery systems under UL 9540 (Standard for Energy Storage Systems and Equipment) and tests thermal runaway fire propagation under UL 9540A. UL 9540A test protocols evaluate cell-level, module-level, and unit-level fire behavior, measuring off-gas composition, burning velocity, and explosive limits.

The International Residential Code (IRC) incorporates battery standards under Section R328. The IRC mandates that battery storage systems installed in garages must be protected from vehicle impact by rated concrete bollards, and garages must be equipped with interconnected heat alarms or smoke alarms communicating with living areas. In the National Electrical Code (NEC/NFPA 70), Article 706 governs storage batteries, mandating external emergency disconnect switches.

Post-incident quarantine and stranded energy hazards¶

The physical danger of a residential battery incident does not terminate when active flames are extinguished. Damaged lithium-ion batteries present severe post-fire hazards centered on stranded energy and delayed reignition.

Stranded energy refers to electrical potential that remains trapped inside damaged cells that did not fully discharge during the fire. Even after the battery casing is charred, uncompromised cells within the module may retain high electrical charge. Mechanical damage, water ingress, and compromised internal insulation can cause delayed internal short circuits hours or even days after initial suppression.

Lithium battery packs can reignite spontaneously 12 to 72 hours after initial extinguishment, requiring strict post-fire safety protocols: - Fire departments establish a 15-meter (50-foot) quarantine perimeter monitored for at least 24 hours; - Technicians scan enclosures with thermal cameras to identify lingering exothermic reactions; - Licensed hazmat contractors transport damaged modules submerged in vermiculite or water-filled steel bins; and - Certified remediation crews decontaminate toxic heavy metals and fluoride soot before rebuilding starts.

Ngaahi fehu'i 'oku toutou 'eke .¶

Can I spray my garden hose on my home battery backup if it starts smoking?¶

You should never spray a standard garden hose on a residential battery backup system that is smoking or off-gassing. Garden hoses deliver low-volume water streams that cannot absorb the massive thermal energy generated inside sealed battery cells. Applying limited water to hot lithium-ion batteries causes water to split chemically into flammable hydrogen gas while washing corrosive hydrofluoric acid residue across your property. High-volume fire department hose lines delivering hundreds of gallons per minute represent the only safe water application method.

What does lithium battery off-gas smell like before it catches fire?¶

Lithium battery off-gas typically produces a distinct sweet, fruity, or acetone-like chemical odor caused by the rapid evaporation of volatile organic carbonate solvents such as dimethyl carbonate and ethyl methyl carbonate. This sweet odor is frequently accompanied by an acrid, sharp chemical sharpness that stings the nasal passages and throat, caused by vaporized electrolyte salts. If you detect an unexplained sweet, solvent-like chemical odor accompanied by hissing sounds in your garage or basement, evacuate immediately.

Is a Lithium Iron Phosphate (LFP) battery completely fireproof compared to NMC?¶

Lithium Iron Phosphate (LFP) batteries are not fireproof, although they are significantly more chemically stable than Lithium Nickel Manganese Cobalt (NMC) batteries. LFP cells have a higher thermal runaway threshold (210 to 270 degrees Celsius) and do not release oxygen during thermal breakdown, meaning they do not produce self-oxidizing fires. However, severe physical damage, prolonged overcharging, or exposure to external structural fires will cause LFP cells to vent large volumes of flammable hydrogen and toxic gases that can still ignite or explode.

How far away should I stand if my home battery storage system is making a hissing noise?¶

You should immediately evacuate to an upwind and uphill location at least 30 meters (100 feet) away from the structure if your home battery is hissing or venting vapor. Hissing indicates that cell burst discs have ruptured and high-pressure off-gas is actively escaping. The off-gas mixture contains flammable hydrogen and methane that can explode violently within enclosed spaces, alongside lethal concentrations of hydrogen fluoride gas that can cause fatal lung injury and cardiac arrest upon inhalation.

Fakamo'oni ki he tokoni 'uluaki¶

Responding to toxic chemical gas leaks, severe electrical thermal burns, and emergency household evacuations requires practical crisis training. We strongly recommend enrolling in a certified first aid, CPR, and hazardous materials awareness course offered by recognized organizations such as the American Red Cross, St John Ambulance, the Canadian Red Cross, or local municipal emergency services. Hands-on training covers acute respiratory trauma triage, chemical burn management, systemic poisoning recognition, and coordinated family evacuation response. Certified skills provide life-saving confidence when unexpected technological emergencies occur.

Kuo vakaiʻi ʻa e ngaahi maʻuʻanga fakamatalá¶

• National Fire Protection Association (NFPA) 855: Standard for the Installation of Stationary Energy Storage Systems
• Underwriters Laboratories (UL): Standard 9540, Energy Storage Systems and Equipment
• Underwriters Laboratories (UL): Test Method 9540A, Thermal Runaway Fire Propagation in Battery Energy Storage Systems
• International Code Council (ICC): International Residential Code (IRC) Section R328, Energy Storage Systems
• National Fire Protection Association (NFPA) 70: National Electrical Code (NEC) Article 706
• United States Fire Administration (USFA): Fire Safety Considerations for Energy Storage Systems
• International Association of Fire Chiefs (IAFC): Lithium-Ion Battery Response Protocols for First Responders

Ngaahi fakahinohino fekau'aki¶

• Ko e fetukutuku mo e mo'ui mei he vela 'o e fale
• Solar panel rooftop DC arc-fault and inverter fire
• Ko e ta'ofi 'o e afi 'uhila mo e ulo 'o e afi
• Electric hybrid and hydrogen vehicle emergencies
• Portable generator carbon monoxide and safety