All You Need To Know About cooling and lubricating liquids are important to improve EVs

Petronas expects to improve the efficiency of EVs by 10 percent with the development of new direct cooling fluids.

  We are aware of the importance of thermal management in EVs.

ย ย Electric vehicles have turned the world upside down in more ways than one: technology has changed, production methods, driving styles, refuelling, tire design and anything else you can think of.ย  Deep below the surface, many changes are on the way, and one of them is the design of liquids that keep engines, motors and drivelines alive.

What You Know and don’t know About Cooling And Lubricating Liquids

ย ย In a conventional car, a mixture of water and glycol (antifreeze) cools the engine but the various oils formulated for each specific function lubricate the engine, axles and transmission and, in some cases, perform the second job of cooling them.

  EVs are different. With ignition outside the equation, there are no combustion products to worry about oil and no high temperature hotspots such as combustion chambers.  EV transmissions still require lubricating and motors still require cooling, though, as with batteries and power electronics.  In fact, they require more than just cooling: they need fine-tuned thermal management to not only protect them but also extract maximum efficiency from them. 

This is an area where oil companies are increasingly focusing on trading as the ICE is fading.

All You Need To Know About Cooling And Lubricating Liquids.

Lubricants designed for EVs

  Petronas Lubricants International is one of the developers of dedicated EV fluids (called the Iona range).  It believes that it will improve efficiency with the increasing range of knock-on effects through the use of specially developed lubricating and coolants for EVs.  Thermal management moves from indirect cooling of electrical and electronic components to direct cooling.  With indirect cooling, heat sinks (usually just alloy panels) absorb heat from the machine, inverter or battery cells and pass it to the coolant pumped around the system in the usual way.

ย ย It is inefficient because some heat is only driven by heat sinks and cooling fluid;ย  The rest must escape.ย  With direct cooling, the liquid is in direct contact with circuit boards, seals and electrical components such as copper and plastic components;ย  And for that to happen without causing a huge short circuit, the fluid must be dielectric (unable to conduct electricity).ย  The story is more complicated as EV drivetrains are combined rather than isolated.ย  The liquid then lubricates the gears and cools the motor and its electronics directly.

  Ultra-rapid charging can be made even faster if the cooling of the battery and charging equipment is improved.  The charge rate for cars with a 350kW charging capacity (Porsche Taycan and Hyundai Ioniq 5, for example) will peak and battery management systems will gradually decrease as the current is ‘throttled’ to prevent damage.  Petronas points out that it takes 41 minutes to charge from the Taycan blank, but if it can charge at 350kW until completed, it can take up to 16 minutes.  That is not to say that it can necessarily be achieved, but it does say that there is an enormous opportunity to improve charging time by focusing on cooling and the fluids that make it.  The next 10 years are a busy time for chemists and it looks like battery-cell technology is going to improve.

  Williams to cool EVs

  The Williams Formula 1 team’s advanced engineering spin-off is collaborating with Castrol on a five-year plan to develop liquids for heat management in EVs starting with Coolant for WAE’s motorsport batteries in 2022.  One of the key areas of interest for WAE.  Castrol is developing cooling technology.

Tesla patented a liquid cooling system called the Battery Management System (BMS).ย  The Tesla system helps keep the battery warm in cold temperatures.ย  The BMS Tesla has every battery cell against the patented coolant pipe.

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  Q) What lubricants do electric cars use?

  Answer.  Electric vehicle fluids: Lubricating the future of mobility

  Shell e-transmission fluid.  The Shell E-Fluids E6I Plus is designed for integrated wet e-motor design battery electric vehicles.  …

  Shell e-thermal liquid,  …

  Shell e-grease,

  Q) What types of cooling systems do the .EVs have?

  Ans. Four different cooling systems,

  Phase Change Material (PCM),

 Finn Cooling,

  Air Cooling.

  Liquid cooling (both direct and indirect)

  Q) .EV Cars Need Lubricants?

  Answer.  In the simplest case, electric cars are powered by batteries and electric motors.  There are no pistons, valves or other moving parts for lubrication in the engine, so no need for regular oil changes in electric vehicles.

  Q) What is EV fluid?

  Ans.HP EV Transmission Fluid is a premium quality synthetic transmission oil that has been specially developed to address the needs of electric vehicles.  โ€ฆ It provides the right balance of power characteristics with gear protection and material compatibility

  Q) What are the different types of coolants?

  Answer.  There are three main types of coolants used by car companies: inorganic additive technology (IAT), organic acid technology (OAT), and hybrid organic acid technology (HOAT).

  Q) .What is the difference between Type A and Type B Coolant?

ย ย Answer.ย  Type A coolers protect your cooling system from corrosion and corrosion, and provide low freezing and high boiling temperatures.ย  Type B coolants are only resistant to corrosion, corrosion and blistering.

Sources CNBC

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