Calling a spade a spade

The benefit of liquid-cooling really only comes into play when DC fast-charging beyond tier-1 speeds (50 kW).

 

I heard some EVs (Tesla?) actually start the cooling cycle while parked in hot weather?

 

Yes, but that feature works with any type of non-passive cooling. In the case of RAV4 Prime, that would be available using A/C air pushed directly through the battery-pack.

 

You're very welcome! Toyota has gotten significantly better on their language in their prints. Repair manuals and internal documents however is still business as usual. I guess google translate from Japanese to English only goes so far.

Agreed. Most people would think liquid cooling is coolant cooling like the inverter. Pretty interesting how the battery essentially counts on the refrigerant and with the high price of the R1234yf I wonder if at some point somebody is gonna decide that they don't need A\C and find out the hard way that they do.

I personally dislike the new refrigerant at $100 a pound makes servicing very difficult and costly. Car comes in with a leak that we can't immediately detect and the sniffer really doesn't work as well on very small leaks and We'd be charging the customer $300-400 for a recharge and 1 year later we're back to square one. We're already dealing with this on patient zero the 2016 Tacoma.

 

For plug ins with actual liquid cooling, the battery pack is cooled with the same loop as used for the inverter.

 

Some where in Owners Manual it says change oil yearly, regardless of Maintenance Minder percent remaining.

 

Yes, but there are benefits to liquid cooling for below those charging speeds, and water is simply a better cooling medium that air no matter how hot something gets. The benefit besides direct cooling is that it allows a smaller, cheaper pack.

Because air isn't efficient at removing heat, more of it needs to flow through and around the battery. This means larger channels that lead to a bulkier pack for the weight. With water being a better coolant, less expensive chemistries can be used, leading to a cheaper pack.

 

Haven't watched the videos, but liquid cooling will make it easier to package the battery in a way to lose less space. Which is likely one of the reasons the Rav4p has refrigerent cooling.

 

Regarding the fuel aging, doesn't the Prime have a pressurized fuel tank to extend the life of the fuel, like the PiP and Volt?

 

Yes.
I think all cars do now. That's why a loose gas cap throws a code.

 

Actually on the Gen 4 you only have 30 minutes to refuel before a flap seals the tank from the filler neck. If the nozzle accidentally hits the latch, you end up with fuel on the pavement. I have not tested but I doubt a loose cap throws a code on Gen 4.

 

Any year of Prius will give you a code if the filler cap is loose, but that's (in the older models anyway) because of self-tests of the system meant to keep vapors from escaping, not any fancier strategy to keep the fuel fresh.

 

In the PiP and the Volt, you had to wait for the car to give an ok to refuel after pressing the button.

 

That's because those two PHEV's and the Prime have a 'fancy' pressure based evaporative emissions control system, not vacuum based like most other cars.
Supposedly to keep the fuel fresh for longer periods.

 

Yep.

 

"Penguin- the other white meat." in your signature.

Salmon, the other pink meat!!

 

I was responding specifically to post 132, which suggested for "all cars" that a pressurized system is why a loose cap throws a code. It'll throw a code even in the older models, even though a pressurized system isn't why.

That was the point of the "in the older models anyway" in my post that you replaced with ....

 

Gen 4 as well.