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    1. #1

      Battery cooling?

      I have had my S40 T5 AWD for about a year and a half now, and I just this week figured out what that duct in the hood was supposed to be for. My investigation was probably hindered by the fact that Iím missing the top of my battery box.





      Questions:

      1. Is battery overheating really such a risk that it needs its own cooling duct?

      2. Am I experiencing some kind of risk by not having the top to the box that meets up with the duct? And if so, where can I get one?

      Thanks!


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    3. #2
      Junior Member Facusan's Avatar
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      I don't think the duct is for "cooling" purposes. since most cars have the battery near the engine. To me its for venting the gasses that come out of the battery.
      The battery won't go anywhere since you have the holding bracket. The only risk I think is having the terminals uncovered. I didn't had a battery cover for more than 2 years on my car until I found one in the junkyard for dirt cheap.

      The of the cover is P/N: is 31301483 and costs ~$30 brand new online

    4. #3
      Junior Member LittleRedRidingHood's Avatar
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      From memory, the Focus ST Mk.II (the engine bay of which is identical in almost every way) does not have that cooling duct which suggests it's just a precaution. That being said, I'm not sure if it had the option of the larger battery which accompanies Volvo's Premium Audio sound system.

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    6. #4
      Quote Originally Posted by Facusan View Post
      I don't think the duct is for "cooling" purposes. since most cars have the battery near the engine. To me its for venting the gasses that come out of the battery.
      The battery won't go anywhere since you have the holding bracket. The only risk I think is having the terminals uncovered. I didn't had a battery cover for more than 2 years on my car until I found one in the junkyard for dirt cheap.

      The of the cover is P/N: is 31301483 and costs ~$30 brand new online
      Thanks for the part number. FCP Euro didnít have fitment, so it didnít come up in my searching.

      I do think it is designed to cool though. Were it simply to vent, it seems it would have been much easer to vent to the rear instead of constructing a series of ducting all the way to the grill (which seems like it would move air from front to rear rather than vice versus).


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    7. #5
      Quote Originally Posted by LittleRedRidingHood View Post
      From memory, the Focus ST Mk.II (the engine bay of which is identical in almost every way) does not have that cooling duct which suggests it's just a precaution. That being said, I'm not sure if it had the option of the larger battery which accompanies Volvo's Premium Audio sound system.
      Interesting...

      I sort of assumed it had something to do with heat from the turbo, but I really donít know. This is my first turbo car, and in 30 years of working on a bunch of random cars Iíve never seen a duct like this before. I generally assume a method to the madness, but I realize automotive design is a bit of a progressive revelation.


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    8. #6
      It has to do with flammable hydrogen being released from a battery while charging - it needs venting or a spark can make it boom. The battery has a sensor below it that dictates charging performance based on temperature.

      Typically this only happens to the extent where an explosion is a worry when you overcharge the battery for a traditional SLA guy, however there is a reason the DOT says only special batteries can be inside the car, and even then they have to be vented to the outside of the car still. I guess there is still SOME risk of bad things.
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    9. #7
      Global Moderator tmtalpey's Avatar
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      Quote Originally Posted by avenger09123 View Post
      The battery has a sensor below it that dictates charging performance based on temperature.
      Only the earlier years. The sensor is deleted in (IIRC) late 2006.

      I'd recommend finding a replacement cover, especially for the large battery (premium audio) in the photo. The others are smaller and provide air space.
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    10. #8
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      Lead acid batteries need to be charged at different voltages depending on the battery temperature. At cold temperatures the battery could be charged at 15+v. At high temperatures the voltage must be 14v or lower. The ECU should have a sensor that measures or infers the battery temperature and it will adjust the charge voltage accordingly.

      If the duct work was figured into the battery charging scheme, it needs to be installed... especially in hot climates. This will help prevent the ECU overcharging the battery when it expects the battery temperature to be controlled due to the duct. However I doubt the duct system is that important because it won't cool the battery in a hot engine bay very much in 90+ degree ambient temperatures.

      But if it was my car I would make sure everything is installed per the original design.

    11. #9
      Member AutoGeek's Avatar
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      Heat will reduce a battery's longevity. If a lead acid battery last longer, it is less lead going into wast in the environment. Volvo seems to take battery temperature seriously. Even the previous generation S40 had a foam cover over the battery.
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    12. #10
      This is helpful everyone. Thanks a lot!


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    13. #11
      Took mine out years ago to fit my intake and Iíve noticed zero difference in battery performance one way or the other. My two cents


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    14. #12
      Junior Member Facusan's Avatar
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      Battery cooling?

      Quote Originally Posted by paradoxicallymodified View Post
      Took mine out years ago to fit my intake and Iíve noticed zero difference in battery performance one way or the other. My two cents


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      This reinforces the theory of the duct is for pushing the battery gasses out of the battery box with ram air to not let them build up. Basically to dilute those gasses.

      Cooling, if there is any, would be a side effect.


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    15. #13
      Junior Member Jirv0id's Avatar
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      I upgraded to a AGM 94R but forgot that I needed different battery terminals. I've been running without the plastic cap for the summer and haven't run into any issues (yet). At least I can have the lights on for more than 5 minutes now.
      2007 V50 T5 AWD M66 ~ Custom machined weighted shiftknob powdercoated wrinkle polstarblue, Custom pod filter intake, Muffler delete, 18" Pegasus IPD Reps, EBC redstuff pads, EBC blank rotors.

    16. #14
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      Quote Originally Posted by RogueRaconteur View Post
      There's a 110v power strip in the picture with 3 110v plugs plugged into it - what is that for?

    17. #15
      Quote Originally Posted by hoonk View Post
      There's a 110v power strip in the picture with 3 110v plugs plugged into it - what is that for?
      High speed electric fans for force induction battery cooling......yeah....thatís it. Lol


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    18. #16
      Quote Originally Posted by hoonk View Post
      There's a 110v power strip in the picture with 3 110v plugs plugged into it - what is that for?
      The car was originally purchased by an Alaskan, who had a block heater fitted. I havenít yet taken the time to remove it.


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    19. #17
      Quote Originally Posted by paradoxicallymodified View Post
      High speed electric fans for force induction battery cooling......yeah....thatís it. Lol


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      Hahaha!! Every bit helps, no?


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    20. #18
      Junior Member Facusan's Avatar
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      Quote Originally Posted by paradoxicallymodified View Post
      High speed electric fans for force induction battery cooling......yeah....thatís it. Lol


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      I thought it was Volvoís version of the Tesla Supercharger


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    21. #19
      Junior Member LittleRedRidingHood's Avatar
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      Came across this today: An S40/V50 D5 engine bay. No cooling duct for the battery, instead reserved for the air intake. Not sure if the engine bay of a diesel is cooler or not...


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