Post by: PaulC on May 25, 2021, 11:12:39 AM
The same technique is used for hybrid batteries to slow down degradation; for example, the Toyota Prius uses an air cooling system where a fan sucks in internal cabin air and blows it out externally. Initially the air intake did not have a filter but after some years Toyota added an intake filter to stop dust accumulating on the battery cells as the dust reduced the cooling efficiency of the air.
So does anyone know if the Jazz Mk4 has a fan cooling system to keep the hybrid battery cool? I can't find any information on the internet which explicitly describes the hybrid battery cooling system with useful details like:
* the location of the air intake duct and the air exhaust duct
* whether the air intake has a replaceable filter
Post by: IanG on May 25, 2021, 11:20:23 AM
I don't think they have any forced air fan cooling and unaware of any filters being installed.
Post by: culzean on May 25, 2021, 11:27:00 AM
I believe the boot mounted hybrid battery has cooling ducks at the sides of the rear seat base, which must remain unobstructed.
How do the cooling Ducks know when to flap their wings ? ( guess you are another victim of the dreaded auto-correct )
Post by: ColinS on May 25, 2021, 12:00:04 PM
I believe the boot mounted hybrid battery has cooling ducks at the sides of the rear seat base, which must remain unobstructed.
How do the cooling Ducks know when to flap their wings ? ( guess you are another victim of the dreaded auto-correct )
If I owned one I would take a gander to see if it too had ducks ;)
Post by: nowster on May 25, 2021, 12:03:06 PM
Post by: madasafish on May 25, 2021, 12:16:42 PM
So hard to believe the Mark 4 does not.
(Renault Zoe has no fan: hence battery degradation is high)
Post by: Zaier on May 25, 2021, 01:17:32 PM
In contrast with the latest Toyota, Jazz doesn't have any cooling filter, so I've made one by myself starting from a sheet of motorcycle foam filter.
Post by: PaulC on May 25, 2021, 11:55:06 PM
thanks for the link to the electrics information. This enabled me to understand how the cooling is done and where the input and output air ducts are located.
I will consider add a low airflow resistance filter to the mouth of the input duct.
It seems to me that the Honda engineers are relying on the cabin air filter to purify the air sucked into the cooling system and assuming that drivers do not wind down the car windows. Given our car will be used to haul bags of compost and firewood logs in the back with the rear seats down, an extra filter is needed.
Paul
Post by: Zaier on May 26, 2021, 05:37:35 AM
I've popped out mine after 4 months, and there were already some dirt, even if it was winter here, so the cooling worked just occasionally.
Consider also that my daughter seats near the air inlet, and from time to time she brings in some glittered toy, which I find spread all over the car the following days
Post by: IanG on May 26, 2021, 06:18:58 PM
I felt it a little drafty in the rear (no ‘Carry On’ jokes please) but found the attached product solved the issue!
Post by: Zaier on June 20, 2021, 09:55:52 AM
It was not so dirty, but there were some dust so it's doing something.
Post by: guest9814 on June 20, 2021, 11:21:36 AM
The IMA Hybrid Mark 2 had a cooling fan but no filter (so it tends to block up after a few years).When i wanted to buy Renault ZOE i checked this, if remember correctly there air cooling for battery, and A/C duct goes directly in to battery.
So hard to believe the Mark 4 does not.
(Renault Zoe has no fan: hence battery degradation is high)
Post by: PaulC on June 20, 2021, 09:56:30 PM
thanks for the photos of your DIY filter as it gives me an example as to how to make the filter.
This is such a simple and cheap modification that it puzzles me as to why Honda didn't add it as standard to the Jazz hybrid in the factory?
Post by: Zaier on June 20, 2021, 10:01:10 PM
Post by: jazzaro on June 21, 2021, 08:12:04 AM
Yesterday I vacuumed the car, and took the occasion to remove and clean my self-made battery air filter.Nice.
It was not so dirty, but there were some dust so it's doing something.
I would just try with a thinner filter material, maybe the tissue used for extactor fans in our kitchens, or other materials just to limit as little as possible the air flux. You only need to stop big pieces of dust, leaves, hairs, pieces of paper, glitters and similar, so also a mosquito net would be ok.
If your foam is enough permeable, please forget this message.
Post by: Zaier on June 21, 2021, 08:36:34 AM
I'm pretty confident that is ok, because sometimes I hear the fan running, but after some minutes it stops, so I guess the fan is still able to cool down the battery.
At first I thought about using paper as Toyota is doing nowadays, but I couldn't find the "right" one for filters.
After having purchased the foam, I thought about recycling a face mask, but it was too late...
Funny thing about the foam, it's quite had to exhale through it, but I can inhale almost as normal.
Post by: richardfrost on June 21, 2021, 11:40:11 AM
Funny thing about the foam, it's quite had to exhale through it, but I can inhale almost as normal.
Better make sure you install it the right way round then :D
Maybe your sponge filter employs Nikola Tesla's unique one way valve design?
https://en.wikipedia.org/wiki/Tesla_valve
Post by: Zaier on June 21, 2021, 12:09:14 PM
no, I guess is some simpler physical fenomenom
Post by: Hugh R on July 25, 2021, 03:19:59 PM
Post by: PaulC on July 25, 2021, 09:17:45 PM
to answer your question, here's a excerpt from a document detailing the breakdown of the Jazz electric parts:
" The figure shows the flow path of the battery cooling air being drawn in through the intake air ducts in the cabin and next to the rear seats (Ⓐ), then enters through the ducts in the upper lid of the IPU (Ⓑ), and is evenly distributed to the four batteries. It flows down the battery module from top to bottom through the upper branch duct, passes through the exhaust ducts at the bottom of the batteries, and is then drawn into the cooling fan and discharged from the vicinity of the rear bumper (Ⓒ"
Post by: Zaier on July 30, 2021, 07:05:25 AM
You could find some situation where the car will use more the combustion engine instead of going in EV mode.