Dɛn ne ɔhyew a wɔde yɛ adwuma?- Polinovel .

Ɛyɛ ɔhyew mfɛnsere a wɔma lithium-ion pack no kwan ankasa sɛ ɛbɛbɔ na ayɛ nsu a BMS no ntow tantrum anaasɛ nkwammoaa no a wokum wɔn ho komm. Nnɔmba a wohu wɔ dodow no ara so no, adetɔfo dodow no ara-Grade 18650/21700 datasheets (discharge –20℃to 60℃, charge 0℃to 45℃) nyɛ atosɛm, nanso wɔyɛ "aguadi mu ahobammɔ" nɔma. Asetra ankasa yɛ basabasa.

Me atetew tumi a ahonhon a ɛdɔɔso-adwinnade packs ne frozen E-bike battery a ɛbɛma mahu: Datasheet no yɛ nsusuwii no, amusiei no ne adeyɛ no.

Storage temperature yɛ 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 wo ho ayɛ hyew no. Ɔhyew a ɛyɛ adwuma ne bere a current no sen. Ɛno ne bere a ɛsɛ sɛ chemistry si jellyroll no mu ankasa, na chemistry yɛ diva a ɛfa ɔhyew ho.

Charge below 0℃na wore 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, ɛbɛ sulk kɛkɛ: voltage sags te sɛ kraman, mu resistance triples, na wo nya ebia 60–70 % of rated capacity. Ɔhyew no san kɔ soro na ɛyɛ anigye bio. Ɔhaw biara nni hɔ a ɛbɛtra hɔ daa.

99 % wɔ consumer cells: 0℃kosi 45℃, ɛtɔ mmere 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 no kɔ titiriw zero ase 0–2℃. Chinafoɔ scooter packs binom nnyɛ saa, na ɛno nti na wohu puffed pii-up battery wɔ Harbin parking lot spring biara.

Nokwarem no, nneɛma bi wɔ hɔ a ɛyɛ soronko:

Saft, tadiran, anaa custom aerospace cell ahorow bi a ɛwɔ funky electrolytes betumi agye charge wɔ –20℃, nanso wutua denam hwene no so.

LTO (lithium titanate) serew wɔ –30℃charging. Nea enye wɔ ho? Energy density no fã ne ne bo yɛ mmɔho abien. Wo spec lto nko ara sɛ worekyekye bɔs ama Siberia anaa Fast-gye stations wɔ Norway.

Upper limit taa yɛ 45℃efisɛ nea ɛboro saa no, SEI nyin ne electrolyte decomposition kɔ exponential. Charge an NMC811 cell wɔ 55℃da biara na wobɛhwɛ no akɔ fam akɔ 80 % SOH wɔ asram abiɛsa mu sen sɛ wobɛhwɛ mfe abiɛsa.

Operating Temperature

Nkwammoaa dodow no ara yɛ specced –20℃to 60℃, bɛyɛ –30℃mprempren. Awɔw ma cell no yɛ ɔkwasea kɛkɛ (ir a ɛkorɔn, ahoɔden a ɛba fam wɔ adesoa ase, tumi a wɔde di dwuma kɛse). Ɔhyew ma ɛyɛ ntɛmntɛm, nanso biako-bere 70℃discharge renkum no ntɛm ara - plastic afã horow no betumi, nanso.

LFP yɛ Heat King. Mehunuu CATL Grid module ahodoɔ a ɛrekɔ so 65℃a mensɛe fifiri. NMC/NCA wɔ saa ɔhyew no mu? Nneɛma a wɔde yiyi nneɛma mu no fi ase so tew na wo ne no ntam kwan ware biako pɛ.

Wobɛhunu sɛ nkwammoaa ahoahoa wɔn ho "–40℃to 85℃a ɛreyɛ adwuma." Wɔn wɔ hɔ. Asraafo, ngo & gas, ne EV ayɛfo binom tɔ. Nea brochure no nteɛteɛm: 20–30 % ahoɔden a ɛba fam, 2–4× ɛka, ne mpɛn pii no cycle nkwa efisɛ electrolyte no ayɛ ma wɔ weird additives. Wotua range no ho ka, wo hwere wɔ biribiara a aka no so. Fa di dwuma bere a ɛsɛ sɛ drone bi fi ase wɔ –35℃wɔ Alaska anaa bere a wo satellite no ntumi ntɔ ɔhyew afiri nkutoo.

Fa batere adaka tuntum bi gu Texas owia tẽẽ mu wɔ 38℃ambient → cell surface hits 65℃easy. Fast-gye 300 kW pack wɔ ahohuru bere mu → ΔT a ɛyɛ 25℃wɔ simma du mu mpo a nsu a ɛyɛ nwini wom. Gyae sakre wɔ abɔnten wɔ –15℃Canadian Winter anadwo → Core temperature yɛ –13℃anɔpa, na dabi, BMS no remma wo mmuada-charge kosi sɛ heater no bɛsɔre.

Tesla, Byd, titiriw no obiara a ɔyɛ aniberesɛm, di kan yɛ pack no hyew wɔ ɔkwan a ɛkɔ supercharger no so wɔ awɔw bere mu na ɛma ahoɔden fi hɔ wɔ ahohuru bere mu. Wo Aliexpress E-SCOOTER a ɛyɛ wo kwan so no? Ti pa.

Operating Temperature

Kɛmistri	Charge a wɔtaa de di dwuma .	Nsu a ɛtaa fi mu ba .	Nsɛm a wɔakyerɛw .
NMC / NCA .	0–45℃.	–20–60℃.	Ahoɔden a ɛkorɔn, ɔhemmaa a ɔyera a ɛyɛ hyew .
LFP .	0–60℃(bɛyɛ 65) .	–20–65℃.	Toasty ne ahobammɔ, tan deep cold power .
LTO .	–30–55℃.	–40–65℃.	charges wɔ baabiara, ɛkora ahoɔden no fã .
"Asraafoɔ abasobɔdeɛ".	–40–85℃.	–40–85℃.	Ɛwɔ hɔ, Hurts Wallet .

Bottom line: Fa datasheet anohyeto ahorow no sɛ mmara a emu yɛ den ma charge, soft akwankyerɛ ma discharging, ne atosɛm a edi mũ ma "nea ɛkɔ so ankasa wɔ wuram."

Fa wo pack no sie 15–35℃sɛnea onipa betumi ayɛ na ɛbɛdɔ wo ama cycle apem. Biribiara a aka no yɛ nneɛma a wɔsɛe no so tumi.