Coolant hi eng nge ni?

Coolant chu i battery pack kal tlanga thil kal chhuak, cell-te’n anmahni an ei loh nan a ni. Pretty simple concept mahse mi tam takin an hre sual.

EV leh ESS application-ah chuan glycol-water mix cold plate emaw cooling channels machine hmanga pack structure-a machined emaw kan sawi a ni. Fluid hian cell atanga lumna a la khawm a, chiller emaw radiator emaw ah a phur a, a lumna a dum a, a tam zawk turin a rawn let leh thin. Loop hian pack active a nih chhung chuan a kal zel a.

A tui ngei chu .

Automotive coolant chungchanga i hriat apiang chu theihnghilh rawh. Autozone atanga lo chhuak prestone green chuan battery pack a tichhia ang. Conventional antifreeze-a corrosion inhibitor te hi ionic compound-Electric an nei thin. Chu chu 400V pack hmangin i run a, ground faults i dil a ni.

Battery coolant hian regular antifreeze-in a ngaih pawimawh loh thil pahnih a tlin a ngai a ni:

Electrical resistivity above 100 kΩ·cm minimum. Most OEMs spec 150 kΩ·cm or higher. Tesla's spec calls for >200 kΩ·cm a ni a, fill thar a ni.

Ion content 25 ppm hnuaiah a awm. Specs thenkhatah chuan 10 ppm an ti bawk. Hei vang hian distilled water chauh i hmang thei lo a, i duh duh i mix thei lo-Glycol ngei pawh hi ultra-pure a ni tur a ni.

BASF Glysantin G40 leh Arteco Havoline XLC te hi field-a i hmuh tam ber tur pahnih an ni. Chevron hian battery-specific formulation a siam bawk. Hengte hi gallon khatah $40-60 vel an ni a, regular oat coolant atan $12-15 vel an hmang thung. Manhla.

mix ratio .

50/50 Ethylene glycol chu deionized tuiah a awm a, chu chu standard a ni. Tlangval thenkhat chu khaw lum laiah 60/40 in an tlan thin. 60% aia sang Glycol hian a ti na tak zet che-Viscosity a sang a, heat transfer a tlahniam a, pump a thawkrim zawk.

A freezing point math te chu:

50/50 ah chuan freeze hi -37℃vel a ni.

60/40 chuan -52℃a thlen thei che a ni.

Pure glycol chu -12 degree-ah a freeze a (yes, tui dah belh chuan freeze point a tihhniam a, chemistry chu a mak hle)

North America hmun tam zawk tan chuan 50/50 hi a tha. Minnesota emaw Alberta emaw-a pack i deploy dawn a nih chuan i thermal engineer nen hausa zawka kal chungchang sawipui rawh.

Flow rate 1000 a ni.

Hetah hian buaina nasa ber ka hmu a. Mite chuan pump an oversize emaw, an undersize emaw a ni.

A chhut dan pawh a buaithlak lo. Thil pathum i hriat a ngai a, chu chu pack hian heat engzat nge a siam, eng temperature rise nge circuit pumpuiah i tuar theih ang, leh i coolant’s specific heat.

50/50 EG/Tuix tan chuan a lumna bik chu 3.3 kJ/kg·k vel a ni. density 1.07 kg/l vel a ni.

2C discharge titu 75 kWh pack i nei tih sawi rawh. Chu chu 150 kW output a ni. Figure 5-6% chu chutiang rate-ah chuan heat generation-Call it 8 kW thermal load. Inlet-to-outlet delta chu 4℃hnuaiah dah i duh chuan :

8000 W ÷ (1.07 kg/l × 3300 j/kg·k × 4 K) × 60=34 l/min

Chu chu project tak tak atanga number dik tak a ni. Pump kan spec'd tak tak chu headroom min pek theih nan 40 l/min rated a ni.

Passenger EV pack tam zawk hi 8-15 l/min velin driving load pangngaiah an tlan thin. Fast charging emaw, sustained high power emaw laiin a bumps up thin.

Eng nge dik lo .

Kum tam tak chhunga failure mode tlemte a hmu.

Coolant chi dik lo a ni.Shop top off off a ni a, service laiin antifreeze pangngai a awm bawk. Conductivity spike a awm bawk. BMS chuan isolation fault a hmu a, pack a khar. I vannei a nih chuan code a throw mai thin. I vannei lo a nih chuan internal arcing i hmu thin.

Contamination a awm.Tui quality a pawimawh. Site pakhatah chuan initial fill atan tap water hman a ni a, a chhan chu "engtin pawhin deionizer kaltlangin a kal a ni." Deionizer an bypass tih loh chu. Chloride awm zat chu 180 ppm a ni. System pumpui chu flush vek a ngai a, $200K installation-ah chuan cold plates-$40K job chu a thlak a ngai bawk.

Hun kal zelah degradation a awm.glycol chu a oxidize a. glycolic acid a siam a, chutah chuan oxalic acid a siam leh thin. pH a tla thla. Corrosion inhibitor te chu an hmang zo ta. OEMs chuan kum 4- kum 5 service interval an ti a mahse coolant chu kum 2 chhungin high-temp environment-ah a lo chhe tawh tih ka hmu a. Kum tin test thin tur a ni.

boruak chhunga boruak awm.Bleeding EV cooling loops hi a finicky hle. Air pocket hian hot spot a thlen thin. Bubble hnuaia direct-a cell chu a ṭhenawmte aiin 8-10 degree-ah a lum zawk. Accelerated aging, capacity fade, a tawpah warranty claim a ni.

Testing Coolant dinhmun .

Measurement pathum i mamawh a ni:

pH-Fresh coolant hi formulation a zirin 7.8 atanga 8.5 thleng a ni. 7.0 hnuaiah chuan inhibitor package a tlahniam tihna a ni. A thlak danglam thin.

Resistivity-portable meter awm mahse a man a to hle. Sample pakhat chu lab-ah thawn la, i neih loh chuan. 50 kΩ·cm hnuai lam eng pawh chu marginal a ni ta.

Glycol concentration-Refractometer hian hna a thawk. $30 tool, second 10 vel a ngai. Condensation atanga dilution emaw, mi pakhatin tui dik tak a dah emaw a nih leh nih loh i enfiah a ni.

Fleet thenkhat chuan oil analysis style program an ti thin a, thla 6 danah Polaris Labs emaw Blackstone emaw ah sample an thawn thin. Overkill for application tam zawk mahse installation lian tan chuan awmzia a nei.

Direct immersion vs indirect cooling a awm bawk.

A chunga kan sawi zawng zawng hian indirect cooling-fluid chu channel kaltlangin a kal a, cell a khawih ngai lo. Chu chu 95% chu a ni.

Direct immersion hi a danglam hle. Cell te chu dielectric fluid bath-ah an thu a. Cold plate awm lo, thermal interface material awm lo, fluid hian can direct in a tawk. Heat transfer a tha zawk. Complexity hi kawng thenkhatah chuan a hniam zawk a, kawng dangah chuan a sang zawk.

Fluid te pawh an danglam. 3M Novec leh Solvay Galden te hi hming langsar tak an ni. Chungte chu fluorinated compound an ni a, conductivity hniam tak, chemical inert an ni. Tin, a man to hle bawk-$300-400 liter khatah formulations thenkhat tan.

Direct immersion chu grid storage leh high-performance vehicle application thenkhatah a lang chhuak a. Mainstream ni lo mahse thermal performance hi sawi harsa tak a ni.

Spec sheet .

Battery coolant sourcing huna i en tur chu eng nge ni ang tih chu quick reference a ni:

I supplier hnen atangin MSDS leh technical data sheet te chu la rawh. Resistivity data an pe thei lo a nih chuan supplier dang zawng rawh.