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 Post subject: Battery Chiller
PostPosted: Wed May 30, 2018 6:44 pm 
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Joined: Tue Apr 25, 2017 6:23 pm
Posts: 21
Has anyone ever checked out the chiller for the battery? I am trying to determine if mine is functioning properly; whenever parked with the hood open, I have always noticed that the refrigerant line to the chiller is never cold like the line to the cabin evap coil. Has anyone noticed this on a hot day?


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 Post subject: Re: Battery Chiller
PostPosted: Sat Jun 02, 2018 2:15 am 
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Joined: Mon May 19, 2014 4:49 am
Posts: 574
Location: Ithaca, NY
ph2 wrote:
Has anyone ever checked out the chiller for the battery? I am trying to determine if mine is functioning properly; whenever parked with the hood open, I have always noticed that the refrigerant line to the chiller is never cold like the line to the cabin evap coil. Has anyone noticed this on a hot day?


The battery is cooled using the same AC compressor as the cabin air. So if you have cold cabin air, your battery is getting cold fluid too. I could be wrong but I am pretty sure thats right.

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 Post subject: Re: Battery Chiller
PostPosted: Sat Jun 02, 2018 8:11 am 
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Joined: Sun May 12, 2013 6:00 am
Posts: 62
Location: San Diego, CA
not 100% accurate.
You have to be in none Eco modes .
So, always put it on auto or normal to ensure battery is getting chilled ..


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 Post subject: Re: Battery Chiller
PostPosted: Sat Jun 02, 2018 12:28 pm 
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Joined: Tue Apr 25, 2017 6:23 pm
Posts: 21
Thanks for the replies so far; I suppose I should clarify my question.

The battery chiller and cabin evap coil are supplied by the same compressor. However there is an actuator on the chiller that controls the flow of refrigerant.

Does anyone know when this actuator should be open/closed?
Is it simply controlled by battery temp when set to 'AUTO' or are there other control variables such as the car needs to be moving, etc?
I have observed that my chiller does not receive refrigerant when the AC is set to 'AUTO', the battery temp is high and the car is parked; has anyone else observed this or can replicate/confirm?


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 Post subject: Re: Battery Chiller
PostPosted: Sat Jun 02, 2018 11:42 pm 
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Joined: Thu Jan 17, 2013 11:13 pm
Posts: 1706
Location: Los Altos, CA
There is a "Thermal ECU" that controls this stuff based on actual battery temps. However, its behavior is not publicly documented. The batteries actually like to be a little warm, so in reality they don't need cooling unless it's over 90F outside and you are driving fast or fast charging. In order for it to do active cooling, either with the radiator or the A/C, the car needs to be ON in READY, or charging. If you hear the fans running during charging, it still may not be cooling the battery, it may just be getting the heat out that was generated by the on-board charger.

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