WeberAuto Examines The Chevy Bolt EV’s Battery Coolant System

DEC 12 2018 BY WADE MALONE 15

Professor Kelly also breaks down the electronics and cabin coolant systems of the Bolt

For the past several months, Professor John Kelly at WeberAuto has been posting a series of videos on the 2017 Chevy Bolt EV. He has aimed to explain the operation of the car and provide info on diagnosing and repairing the vehicle. So far, most of those looks have been at the battery pack. Including an excellent disassembly and reassembly of the vehicle’s battery pack. This time, John gives an overview of the three separate coolant systems of the Bolt.

First up, John takes a look at the cooling of the the electronics and the motor. (4:12) Next he examines the “rechargeable energy storage” coolant system. (16:28) That is to say, the system of cooling plates that located beneath the battery pack. This allows the vehicle to warm or cool the pack as necessary. Keeping an electric vehicle’s battery at the optimum temperature is important for a number of reasons including battery longevity. (Hopefully Nissan is watching this.) Finally, John briefly overviews the final system: the cabin heater coolant system. (28:40)

As expected, the video is very technical in nature. So rather than summarize, we will leave the details to the expert. Be sure to check out the full video above.

Bolt EV Electronics Cooling System

Chevy Bolt EV DC Charging Port

Chevy Bolt EV Cabin Heater

Video description from WeberAuto

See the three different coolant system loops of the Chevrolet Bolt EV high voltage system. Learn how they are connected and how they function.

Chevrolet Bolt EV high voltage electrical system coolant system loops – A Youtube first! Weber State University (WSU) – Department of Automotive Technology – Ardell Brown Technology Wing – Transmission Lab. This is the sixth in a series of videos on the 2017-2019 Chevrolet Bolt EV

Categories: Chevrolet, Videos

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15 Comments on "WeberAuto Examines The Chevy Bolt EV’s Battery Coolant System"

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Will BOLT EV enter the Chinese market?

It’s getting late as the car is already on its third model-year.
Maybe the new upcoming model…

That is a nice rendering! It would be cool to see it from some other angles, but it looks good. So Buick is thinking about building an electric car and they want to name it Enspire? Knowing that Buick sold Electras for years, Enspire sounds kind of lame.
Bring back the Electra nameplate! 😉

Always great information from prof Kelly on these things. He confirmed my “guess” of a 2 kw heater for the Bolt ev battery.

One difference (an economization) from the GEN 1 VOLT was the battery never uses free cooling, but MUST be cooled from the refrigeration system, in this aspect identical to the battery cooling system for the old Tesla Roadster.

Apparently it was decided that the energy savings when the ambient is cold is not worth it since at that time the refrigerant compressor will not be using many watts since the condensing pressure during cold ambients is low and hence almost no horsepower is required.

Exactly. +1.

Separate cooling systems limits the ability to scavenge heat. It also increases build and maintenance costs.

Odd choice.

The optimal heat scavenging concept would be to scavenge heat from the motor/power electronics loop and put it into the cabin heating loop. This would be pretty easy to do without “blending” glycol loops. Just add a controllable diverter valve + a small glycol-glycol brazed plate heat exchanger (it would physically be similar to the Bolt’s battery cooling “chiller”) between the cabin and motor-cooling loops and you could provide about half the cabin heat for “free.

I believe the Kia Soul EV and some other EVs that use heat pumps for cabin HVAC heat do this, except the drive unit glycol heat is diverted into the cabin heat pump loop with a glycol-refrigerant heat exchanger.

Why do all of his vids have an “I Am Legend” last person alive on earth feel to them? There’s never another single human being in any of them, yet you know tons of people have to work on those cars to take them apart, label the parts, etc.

I’ve seen an assistant in some of his videos, but C’MON, give the guy a break!

I’ve never noticed the slightest haughtiness from this guy, and would have loved to have him as a professor during my university time.

He also freely admits errors, as for instance at the start of this one where he says the heater will indeed work while fast charging (if the battery isn’t too drained).

Put it this way, some of the loud mouth commenters here never admit their mistakes, and don’t know what they are talking about in the first place. Some are so dumb they don’t even realize how dumb they are. But they have no problem being the Big-Expert.

Contrast them with Kelly – here is someone that is clearly knowledgeable, yet never ever brags about how much he knows. He is CLEARLY interested in succinctly providing as much information to the student as possible, and freely admits when he is unsure, or does not know something for sure yet.

What a refreshing teaching experience he provides.

You are incorrect. I label and disassemble/reassemble everything myself. Sometimes I need help moving a vehicle or a heavy part. Otherwise it is just a one an show.

Professor Kelly Sir:

Please don’t change a thing.. Your productions are a real breath of fresh air. I speak for many here saying how much we truly appreciate your fine work.

Yup, we know you don’t create it just for us EV fans at IEVs, but we appreciate the work you do.

Very interesting! Keep it up.

As the owner of a 2019 Bolt Premier and formerly a Nissan Leaf I’m grateful for his expert knowledge and presentations. I would consider it an honor to be his assistant!

Like your thoughts on covering the cabin heater components with towels or insulation to help keep the warmth in the system on very cold days when parked outside on short trips. I did this on the Leaf for the four years I had it. Not sure of a result, just made sense to keep the system from losing heat while powered off.