Gen5 battery vent: where is it?

RandyPete · Mar 1, 2025

RandyPete said: ↑

The Gen5 PP is unlike earlier Gens when it comes to traction battery cooling. It does not use air to cool the battery. It uses the cars climate control system and heat pump to cool/heat the traction battery as needed. There is no air vent or fan or filter. The noise you hear when you charge the Traction Battery is a fan on a small inverter located in the hatch area of the car that provides some 12v power when the traction battery is being charged. I could not find an air duct or exhaust port for this device fan.
The 2023 & 24 traction battery is not inside the car, it is under the car and accessed and serviced by getting under the car and accessing it like an older transmission or transfer case. It gets disconnected electrically and climate control lines disconnected, and then is lowered from the bottom side of the car to the shop floor.
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Since this post, I have learned that there is only one DC to DC charger in the gen 5 Prius. Its located in the engine compartment as an integral part of the inverter. It charges the 12v battery in the READY mode & in the the Traction Battery charge mode (from 120vAC power).

RandyPete · Mar 2, 2025

KMO said: ↑

My current view is that there still is a second DC-DC converter, cos you can see the wiring and fuse, which then suggests the systems can still be isolated - otherwise why retain the second?

My guess is it activates the main one for 12V charging (as was happening in that video), My Room mode or HV battery cooling, but otherwise leaves the main system off. More investigation required.
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Have you done any more investigation into this ?

KMO · Mar 2, 2025

RandyPete said: ↑

Have you done any more investigation into this ?
Click to expand...

Only what's in this thread:

WeberAuto: 2024 Prius Prime PHEV Low-Voltage Charging System Testing | PriusChat

Professor Kelly demonstrated the main DC-DC converter operating and charging a low 12V battery while traction battery charging.

And a bit more digging around the manuals led me to conclude that there is no longer a second converter, after all.

Gen5 battery vent: where is it?

RandyPete Active Member

RandyPete Active Member

KMO Senior Member

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Gen5 battery vent: where is it?

RandyPete Active Member

RandyPete Active Member

KMO Senior Member