Hybrid Battery Temperature Monitoring

[Mavster Mechanic]

HYBRID SPECIFIC

HYBRID owners with data readers:

Have you watched the following two parameter ID's (PID)?

HV battery temperature
Battery coolant temperature

In mine, battery coolant hovers about the same as ambient. Warmer, but only 2 to 8 degrees. And if ambient goes up by three, the coolant goes up by three. If ambient goes down by five, coolant goes down by five. Very "passive" and predictable.

The HV battery temperature goes up in a reasonable manner. Proportionate, commensurate with how vigorously I'm using the battery pack. In stop go stop go which results in charge - discharge - charge - discharge I can see 1 or 2°F rise per minute. When cruising at constant speed, it still heats up, but more slowly.​

The battery pack does not cool down as expected. At a red light; even a really long red light, temperature holds, but does not go down. Parking in my driveway after a 1 hour drive, when I leave the key to run, in 10 minutes of park; the HV battery may cool 1°F, possibly 2°. But, no whooshing air either.

Today; I coasted down a mountain for 8 minutes at 50 to 55 mph with truck in N so there was zero charging or significant discharging (0.7 amp to keep the truck "on") and even with 55 mph wind, the battery did not lose temperature but held steady.

Ambient was 91°F
Coolant was 94°F
Battery was 111°F

Drove 30 miles to a much colder town.

Ambient was 78°F
Coolant dropped to 84°F
Battery was still 106°F

So what do you see?
It "feels like" the battery coolant is not circulating. It feels like all these changes are just from natural convection and passive radiation to the surroundings.
But is 111°F high enough to turn on more "active" cooling?

Sponsored

 

[Dawg]

What meter do you have?

 

[MakinDoForNow]

HYBRID SPECIFIC

HYBRID owners with data readers:

Have you watched the following two parameter ID's (PID)?

HV battery temperature
Battery coolant temperature

In mine, battery coolant hovers about the same as ambient. Warmer, but only 2 to 8 degrees. And if ambient goes up by three, the coolant goes up by three. If ambient goes down by five, coolant goes down by five. Very "passive" and predictable.

​

The HV battery temperature goes up in a reasonable manner. Proportionate, commensurate with how vigorously I'm using the battery pack. In stop go stop go which results in charge - discharge - charge - discharge I can see 1 or 2°F rise per minute. When cruising at constant speed, it still heats up, but more slowly.​

The battery pack does not cool down as expected. At a red light; even a really long red light, temperature holds, but does not go down. Parking in my driveway after a 1 hour drive, when I leave the key to run, in 10 minutes of park; the HV battery may cool 1°F, possibly 2°. But, no whooshing air either.

Today; I coasted down a mountain for 8 minutes at 50 to 55 mph with truck in N so there was zero charging or significant discharging (0.7 amp to keep the truck "on") and even with 55 mph wind, the battery did not lose temperature but held steady.

Ambient was 91°F
Coolant was 94°F
Battery was 111°F

Drove 30 miles to a much colder town.

Ambient was 78°F
Coolant dropped to 84°F
Battery was still 106°F

So what do you see?
It "feels like" the battery coolant is not circulating. It feels like all these changes are just from natural convection and passive radiation to the surroundings.
But is 111°F high enough to turn on more "active" cooling?

I have impression that passive from 72°F to 113(114?) is ok with heating below 72°F and cooling above 113°F.

 

[Mavster Mechanic]

Data from this AM
Time in minutes.

Time - Coolant - Battery - Ambient
0 - 66 - 66 - 64
2 - 66 - 72 - 64 Stop n Go
3 - 66 - 77 - 64 Stop n Go
4 - 66 - 79 - 64 Stop n Go
5 - 66 - 81 - 64 Stop n Go
8 - 68 - 82 - 64 Stop n Go
16 - 70 - 95 - 65 Stop n Go
18 - 70 - 97 - 65 Stop n Go
20 - 72 - 100 - 65 66 MPH constant
29 - 72 - 102 - 65 66 MPH constant
37 - 73 - 102 - 65 66 MPH constant
40 - 72 - 100 - 64 66 MPH constant
49 - 73 - 99 - 64 66 MPH constant
55 - 73 - 102 - 64 66 MPH constant
57 - 72 - 104 - 63 Regen came off hwy
60 - 73 - 102 - 63 off highway, end.

Cool-ish day. Low 60's.
Truck makes little or no effort to cool the battery at 100°F.

 

[Hot Runr Guy]

What meter do you have?

From his picture, I think he has a ScanGauge3

HRG

 

[Mavster Mechanic]

From his picture, I think he has a ScanGauge3

HRG

Bingo

 

[Glen Baker LLC]

Data from this AM
Time in.......

Cool-ish day. Low 60's.
Truck makes little or no effort to cool the battery at 100°F.

Low 60's. break out the parka

 

[Mavster Mechanic]

Low 60's. break out the parka

So what temps do you think your battery is experiencing?

 

[Glen Baker LLC]

So what temps do you think your battery is experiencing?

Top photo was last week bottom photo was Sunday.

And I still change my oil every 10,000 miles regardless of the date and the

 

[Mavster Mechanic]

Are you not curious after seeing mine rise 40°F in only 30 miles on a chilly day?

 

[Mavster Mechanic]

Top photo was last week bottom photo was Sunday.

And I still change my oil every 10,000 miles regardless of the date and the

Two can play this game.
I was towing 3200 lbs at this time.

You can tell it was early into the trip.
MTE just started to go down the toilet.

 

[ZeroDay]

I'm assuming the system is more of a battery heater than a battery cooler. Last winter I had one day below -40 and it would NOT use the electric motors or go into electric mode at all even after an hour of low speed highway. The truck was sluggish it felt like towing a heavy trailer and forgetting to use tow mode.

 

[Glen Baker LLC]

Are you not curious after seeing mine rise 40°F in only 30 miles on a chilly day?

Nope.
I consider it one of the mysteries of life with a Maverick hybrid

 

[Mavster Mechanic]

I'm assuming the system is more of a battery heater than a battery cooler. Last winter I had one day below -40 and it would NOT use the electric motors or go into electric mode at all even after an hour of low speed highway.

This seems like it!

 

[HeyBales]

I only show the HVB temp, not the coolant. I did watch it once.
I didn't see enough variance in the latter to concern me - must have looked during a season of not being used much, so figured what's the point.
Watch ICE coolant, and DCDC temp, which goes higher than HVB temp.

But indeed not seen the HVB lower much once it gets up there.
I do see the SOC% increase wildly from parking hot, to the next morning after cool night.
Greatest extreme was 45% to 68%.

Which tells me when they start counting Ah charge & discharge to adjust the SOC while driving - they must not be adjusting for battery temp - so that could be not close to accurate as it get's hot.

@ZeroDay - if you can get some early coasting in - the system seems more willing to charge when cold, which starts warming it up, and quicker to the point it's more willing to discharge.
Then again - I was only near 0 or tad below F.
Highway speeds don't seem to add much in the way of charging anyway - which may have been good at -40!

Sponsored