Dɛn Ne Ɔhyew a Wɔde Yɛ Adwumayɛ?
Ɛyɛ ɔhyew mfɛnsere a wɔma lithium-ion pack kwan ankasa ma ɛbɔ na ɛtwetwe a BMS no ntow abufuw anaasɛ nkwammoaa no nkum wɔn ho komm. Nnɔmba a wohu wɔ consumer-grade 18650/21700 datasheets dodow no ara so (discharge –20℃to 60℃, charge 0℃to 45℃) nyɛ atosɛm, nanso ɛyɛ "marketing safe" nɔma. Asetra ankasa yɛ basabasa sen saa.
Matetew tumi-nnwinnade packs a ahonhon ne e-sakre batere a ayɛ nwini a ɛdɔɔso a ɛbɛma mahu: datasheet no ne nsusuwii no, amusiei no ne adeyɛ no.
Operating vs Storage: nfrafra wɔn mu
Ɔhyew a wɔde sie ne nea nkwammoaa no betumi atra ase bere a ɛnyɛ hwee koraa no. Wubetumi agyaw NMC cell pa wɔ –40℃afe biako na ɛbɛda so ara ayɛ yiye bere a woayɛ no hyew no. Operating temperature yɛ bere a current resen. Ɛno ne bere a ɛsɛ sɛ nnuruyɛ si wɔ jellyroll no mu ankasa, na nnuruyɛ yɛ diva a ɛfa ɔhyew ho.
Charge ase 0℃na woreyɛ plating lithium metal wɔ anode - irreversible, tumi-kum, na ɛtɔ mmere bi a stabby bere a dendrites nyin. Nsuo a ɛfiri mu ba wɔ –30℃? Cell no renwu, ɛbɛyɛ sulk kɛkɛ: voltage sags te sɛ kraman, emu resistance abiɛsa, na wunya ebia 60–70 % a rated tumi. Warm it back up na ɛyɛ anigye bio. Opira biara nni hɔ a ɛbɛtena hɔ daa.
Charging temperature: nea ɛnyɛ-nea wontumi nsusuw ho
99 % of consumer cells: 0℃to 45℃, ɛtɔ da bi a 0–60℃sɛ nea ɔyɛe no te nka sɛ ɔwɔ akokoduru a. Biribiara a ɛyɛ nwini → lithium plating. BMS biara a ɛfata twa charge current so kodu zero titiriw wɔ 0–2℃ase . Chinafo skuter pack binom nnyɛ saa, na ɛno nti na wuhu batere pii a wɔahyɛ no puff-up wɔ Harbin parking lots ahohuru bere biara.
Nokwarem no, nneɛma bi wɔ hɔ a ɛsono:
Saft, Tadiran, anaa ahunmu nkwammoaa bi a wɔahyɛ da ayɛ a ɛwɔ funky electrolytes betumi abɔ –20℃, nanso wutua denam hwene so.
LTO (lithium titanate) serew wɔ –30 digrii ntɛmntɛm charging. Nea enye wɔ ho? Ahoɔden a ɛwɔ mu no fã ne ne bo mmɔho abien. Wo spec LTO nkutoo sɛ woreyɛ bɔs ama Siberia anaasɛ fast-charge stations wɔ Norway.
Mpɛn pii no, anohyeto a ɛwɔ soro no yɛ digrii 45 efisɛ ɛno so no, SEI nyin ne electrolyte a ɛporɔw kɔ kɛse. Charge NMC811 cell bi wɔ 55℃da biara na wobɛhwɛ sɛ ɛbɛkɔ fam akodu 80 % SOH wɔ asram abiɛsa mu sen sɛ ɛbɛkɔ fam mfe abiɛsa.
Discharging temperature: bɔne fafiri kɛse
Nkwammoaa dodow no ara yɛ specced –20℃to 60℃, ebinom –30℃mprempren. Awɔw ma cell no yɛ ɔkwasea kɛkɛ (IR a ɛkorɔn, voltage a ɛba fam wɔ adesoa ase, tumi a wontumi mfa nni dwuma pii). Ɔhyew ma ɛbɔ ntɛmntɛm, nanso bere biako-de 70℃discharge renkum no ntɛm ara - plastic afã horow no betumi, nanso.
LFP ne ɔhyew hene. Mahu CATL grid modules a ɛretu mmirika 65℃continuous a ɛnsɛe fifiri biara. NMC/NCA wɔ saa ɔhyew no mu? Separators no fi ase shrinking na woayɛ da bɔne biako ma venting.
"Ɔhyew a wɔatrɛw mu" nsisi no
Wubehu nkwammoaa a wɔde hoahoa wɔn ho sɛ "–40℃to 85℃operating." Wɔwɔ hɔ. Asraafoɔ, oil & gas, ne EV yɛfo binom tɔ wɔn. Nea brochure no nteɛteɛm: 20–30 % ahoɔden a ɛba fam, 2–4× ɛka no, na mpɛn pii no ɛtew kyinhyia nkwa nna so efisɛ electrolyte no ayɛ ma wɔ nneɛma a ɛyɛ nwonwa a wɔde ka ho. Wotua range no ho ka, wohwere biribiara a aka. Fa di dwuma bere a ɛsɛ sɛ drone fi ase wɔ –35℃wɔ Alaska anaasɛ bere a wo satellite ntumi ntɔ heater nkutoo.
Ankasa-wiase pack hyew ≠ ambient
Fa batere adaka tuntum bi gu Texas owia tẽẽ mu wɔ 38℃ambient → cell surface hits 65℃easy. Fast-charge a 300 kW pack wɔ awɔw bere mu → ΔT a ɛyɛ 25℃wɔ simma du mu mpo sɛ nsuo a ɛyɛ nwini. Gyae sakre wɔ abɔnten wɔ –15℃Canada awɔw bere mu anadwo → core temperature no yɛ –13℃anɔpa, na dabi, BMS no remma wo mmuadaa-charge kosi sɛ heater no bɛsɔre.
Tesla, BYD, titiriw obiara a ɔyɛ aniberesɛm, preheats pack no wɔ kwan so kɔ Supercharger wɔ awɔw bere mu na derates ahoɔden wɔ awɔw bere mu. Wo sɛ wɔkyekyem pɛpɛɛpɛ a, AliExpress e-skuter? Ti pa.
Quick reference table obiara ammisa nanso obiara hia
| Kɛmistri | Ka a wɔbɔ no mpɛn pii | Nsu a wɔtaa de gu nipadua no mu | Nsɛm a Wɔahyɛ no Nsow |
|---|---|---|---|
| NMC / NCA na ɛyɛ adwuma | 0–45 digrii | –20–60 digrii | Ahoɔden a ɛkorɔn, ɔhyew aguan hemmaa |
| LFP na ɛwɔ hɔ | 0–60 digrii (bɛyɛ 65) . | –20–65 digrii | Toasty na ahobammɔ wom, tan awɔw tumi a emu dɔ |
| LTO | –30–55 digrii | –40–65 digrii | Charges wɔ baabiara, sie ahoɔden no fã |
| "Asraafoɔ grade". | –40–85 digrii | –40–85 digrii | Ɛwɔ hɔ, ɛyaw sika kotoku |
Nea ɛwom ara ne sɛ: fa datasheet anohyeto ahorow no di dwuma sɛ mmara a emu yɛ den a wɔde gye sika, akwankyerɛ a ɛyɛ mmerɛw a wɔde gyae nneɛma, ne atosɛm koraa ma "nea ɛkɔ so ankasa wɔ wuram."
Ma wo pack no nkɔ 15–35℃ntam sɛnea onipa betumi na ɛbɛdɔ wo ama kyinhyia apem. Biribiara a aka no yɛ nneɛma a wɔsɛe no sohwɛ.
