Dɛn Ne Coolant?

Coolant yɛ nneɛma a ɛnam wo battery pack mu a ɛmma nkwammoaa no ankasa nnoa. Pretty simple concept nanso nnipa pii nya no mfomso.

Wɔ EV ne ESS dwumadie mu no yɛreka glycol-nsuo afrafra a ɛkyinkyini fa mprɛte a ɛyɛ nwini anaa onwini akwan a wɔde mfiri ayɛ akɔ pack nhyehyɛɛ no ​​mu ho asɛm. Nsu no gye ɔhyew fi nkwammoaa mu, de kɔ chiller anaa radiator mu, tow ɔhyew no gu, ɛsan ba kɔhwehwɛ pii. Loop kɔ so tu mmirika bere tenten a pack no yɛ adwuma no.

Nsuo no Ankasa

Wo werɛ mfi biribiara a wunim fa kar mu nsu a ɛma onwini ho. Saa Prestone a ɛyɛ ahabammono a efi AutoZone no bɛsɛe battery pack bi. Nneɛma a esiw nsɛe ano wɔ antifreeze a wɔtaa de di dwuma mu no yɛ ionic compounds-a ɛde anyinam ahoɔden kɔ. Wo run saa no fa 400V pack mu, worebisa ground faults.

Ɛsɛ sɛ batere coolant di ahwehwɛde abien a antifreeze a wɔde di dwuma daa no mfa ho ho dwuma:

Electrical resistivity above 100 kΩ·cm minimum. Most OEMs spec 150 kΩ·cm or higher. Tesla's spec calls for >200 kΩ·cm wɔ foforo a wɔde ahyɛ mu ma so.

Ion a ɛwɔ mu no nnu 25 ppm. Specs binom ka sɛ 10 ppm. Wei nti na worentumi mfa nsuo a wɔahoro kɛkɛ nni dwuma na woafra w’ankasa wo-ɛsɛ sɛ glycol no ankasa yɛ ultra-pure.

BASF Glysantin G40 ne Arteco Havoline XLC ne abien a wobɛtaa ahu wɔ afuw mu. Chevron nso yɛ battery-specific formulation. Eyinom tu mmirika bɛyɛ $40-60 wɔ galɔn biara mu bere a wɔde toto $12-15 ma OAT coolant a wɔtaa de di dwuma no. Ɛfata.

Mix Ratio a Wɔde Di Dwuma

50/50 ethylene glycol a wɔde yɛ nsu a wɔayi ion afi mu no yɛ nea wɔahyɛ da ayɛ. Mmarima binom tu mmirika 60/40 wɔ mmeae a awɔw wom. Sɛ wokɔ soro 60% glycol a, ɛyɛ wo yaw ankasa-viscosity kɔ soro, ɔhyew a ɛkɔ fam kɔ ​​fam, pɔmpɛ yɛ adwumaden.

Nkontaabu a ɛfa freezing point ho no:

50/50 afrafra no yɛ nwini bɛyɛ -37 digrii

60/40 ma woyɛ ebia -52 degree

Glycol kronkron no yɛ nwini wɔ -12℃(yiw, sɛ wode nsu ka ho a, ɛma nwini no brɛ ase, nnuruyɛ yɛ nwonwa)

Wɔ Amerika Atifi fam dodow no ara fam no, 50/50 ye. Sɛ wode packs reyɛ adwuma wɔ Minnesota anaa Alberta a, wo ne wo thermal engineer nkasa fa kɔ a wobɛkɔ adefo kɛse ho.

Nsuo a ɛsen

Ɛha na mihu adwene mu naayɛ kɛse. Nkurɔfo kwan so ma pɔmpɛ akɛse boro so anaasɛ wɔnyɛ ketewaa bi.

Akontaabu no nyɛ nea ɛyɛ den. Ɛsɛ sɛ wuhu nneɛma abiɛsa: ɔhyew dodow a pack no ma, ɔhyew a ɛkɔ soro a wubetumi agyina ano wɔ ɔmansin no nyinaa mu, ne ɔhyew pɔtee a ɛwɔ wo coolant no mu.

Wɔ 50/50 EG/nsu a wɔde afrafra mu no, ɔhyew pɔtee bi bɛyɛ 3.3 kJ/kg·K. Density bɛyɛ 1.07 kg/L.

Ka sɛ woanya 75 kWh pack a ɛreyɛ 2C discharge. Ɛno yɛ 150 kW a wɔde yɛ adwuma. Mfonini 5-6% ɔhyew awo ntoatoaso wɔ saa dodow no-frɛ no 8 kW ɔhyew adesoa. Sɛ wopɛ sɛ woma inlet-to-outlet delta no sie 4℃ase a :

8000 W ÷ (1.07 kg/L × 3300 J/kg·K × 4 K) × 60=34 L/simma

Ɛno yɛ dodow ankasa a efi adwuma ankasa bi mu. Na ankasa pump a yɛ spec'd no rated 40 L / min ma yɛn headroom.

Akwantufo EV pack dodow no ara tu mmirika 8-15 L/min wɔ adesoa a wɔtaa de ka kar mu. Bumps up bere a fast charging anaasɛ sustained ahoɔden kɛse.

Nea Ɛkɔ Mfomso

Wohuu huammɔdi akwan kakraa bi wɔ mfe no mu.

coolant type a ɛnteɛ.Shop tops off ne amanne kwan so antifreeze bere a wɔsom. Conductivity a ɛkɔ soro. BMS hu isolation fault, pack no to mu. Sɛ wowɔ luck a ɛtow codes kɛkɛ. Sɛ wo nnyɛ lucky a wonya internal arcing.

Efĩ a wɔde ba.Nsu pa ho hia. Beae biako a meyɛɛ adwuma no de tap nsu dii dwuma maa mfiase fill efisɛ "ɛfa deionizer no mu ɔkwan biara so." Gye sɛ wɔtwaa deionizer no ho hyiae. Chloride a ɛwɔ mu no yɛ 180 ppm. Na ɛsɛ sɛ wɔhoro nhyehyɛe no nyinaa na wɔsesa mprɛte a ɛyɛ nwini-$40k adwuma wɔ $200k instɔlehyɛn so.

Ɔsɛe a ɛba bere a bere kɔ so no.Glycol ma ɛyɛ oxidize. Ɛyɛ glycolic acid, afei oxalic acid. pH so tew. Nnuru a esiw nsɛe ano no yɛ wɔn su. OEMs se 4-5 year service interval nanso mahu sɛ coolant akɔ bɔne wɔ mfeɛ 2 mu wɔ high-temp environments. Sɔ hwɛ afe biara.

Mframa a ɛwɔ nhyehyɛe no mu.Mogya a ɛretu EV cooling loops no yɛ finicky. Mframa kotoku ma mmeae a ɛyɛ hyew ba. Nkwammoaa a ɛwɔ ahurututu no ase tẽẽ no tu mmirika digrii 8-10 sen n’afipamfo. Onyin a ɛba ntɛmntɛm, tumi a ɛwɔ hɔ no yera, awiei koraa no ɛyɛ warranty claim.

Coolant Tebea a Wɔsɔ Hwɛ

Wohia susudua abiɛsa:

pH-nwini a ɛyɛ foforo no tu mmirika 7.8 kosi 8.5 a egyina sɛnea wɔayɛ no so. Sɛ ɛba fam 7.0 no kyerɛ sɛ inhibitor package no asa. Sesa no.

Resistivity-portable mita wɔ hɔ nanso ne bo yɛ den. Fa sample bi kɔ lab sɛ wunni bi a. Biribiara a ɛba fam sen 50 kΩ·cm no reyɛ marginal.

Glycol dodow-refractometer yɛ adwuma. $30 adwinnade, gye sikani 10. Worehwɛ sɛ dilution fi condensation anaa obi a ɔde nsu tẽẽ ka ho.

Po so ahyɛn binom yɛ oil analysis style nhyehyɛe, de samples kɔ Polaris Labs anaa Blackstone asram 6 biara. Overkill ma application dodow no ara nanso ntease wom ma instɔlehyɛn akɛse.

Direct Immersion vs Indirect Cooling a wɔde hyɛ mu tẽẽ

Biribiara a ɛwɔ atifi hɔ no fa no sɛ onwini a ɛnteɛ-nsu no fa akwan mu, ɛnka nkwammoaa da. Ɛno yɛ 95% wɔ nea ɛwɔ abɔnten hɔ no mu.

Ɛsono sɛnea wɔde nsu gu nsu mu tẽẽ. Nkwammoaa tra nsu a ɛwɔ anyinam ahoɔden a wɔde guare mu. Mprɛte a ɛyɛ nwini biara nni hɔ, nneɛma a ɛwɔ ɔhyew ntam biara nni hɔ, nsu ne toa no di nkitaho tẽẽ. Ɔhyew a wɔde kɔ baabi foforo no ye sen biara. Nneɛma a ɛyɛ den no sua wɔ akwan bi so, na ɛkorɔn wɔ akwan foforo so.

Nsuo no nso yɛ soronko. 3M Novec ne Solvay Galden ne din akɛseɛ no. Eyinom yɛ nneɛma a wɔde fluorine ayɛ, a ɛmma nsu nkɔ mu koraa, na nnuru ntumi nkɔ mu. Afei nso ne bo yɛ den yiye-$300-400 lita biara ma nnuru bi a wɔde yɛ nnuru.

Direct immersion reda adi wɔ grid storage ne kar dwumadie bi a ɛyɛ adwuma yie-adwuma mu. Ɛnyɛ mainstream de besi nnɛ nanso thermal performance no yɛ den sɛ wobegye akyinnye.

Spec Krataa a Wɔde Di Dwuma

Nhwehwɛmu a wɔyɛ no ntɛm a ɛfa nea ɛsɛ sɛ wohwehwɛ bere a worehwehwɛ battery coolant:

Nya MSDS ne mfiridwuma ho nsɛm krataa no fi nea ɔde nneɛma ma wo no hɔ. Sɛ wontumi mfa resistivity data mma a, hwehwɛ supplier foforo.