2010 Prius II HV Battery Reconditioning

What is “cycling the pack” , “top end balance”, and “a two cycle reconditioning “? I just arrived from another planet


iPhone ?

 

The instructions say to let it cool for a while before charging. That is essential. I have a thread on what can happen if you forget to let it cool.

I like the extra precaution of pulling down the charge a little before driving. Otherwise, the engine will start up and it can conceivably add even more charge to an already full battery before the BMS has had time to register that the battery is already at 100% soc when it normally tops out at about 83%. I think it's easier on the battery to leave a little buffer there. Just my slightly paranoid opinion.

I suppose you could put it in neutral right away when you start it and run the air conditioner and/or headlights to do the same thing since it won't charge the traction battery while in neutral.

 

Won't the computer turn off or lower the charging rate once the hybrid battery reaches a certain voltage?
And the same for the 12v battery. So neither gets over charged.
If you were heading down a mountain and the battery was a full charge, it would continue to charge it and over charge it.
The engine wouldn't have to run, the regeneration would charge.
I would think the computer would know the charge/voltage and either lower the amperage so it would just maintain it
or trickle charge it.

 

You charged the battery while the system was off so sometimes it takes a few minutes for the system to recognize the new actual SOC, because it wasn't where it left it. During this time it could try to charge the battery. After a full charge my correct SoC didn't register until I disconnected the 12v for 60 secs.

 

...and if the car does not recognize the fully charged pack, you could kill your pack. Just ask @jerrymildred (or not).

 

One small thing, to let it cool during the cycles too?

 

That does! Thanks!

 

I think that @Cyvan answered your main question very well. It takes a while, as I said, for the system to become aware of the new state of charge ("it can conceivably add even more charge to an already full battery before the BMS has had time to register that the battery is already at 100% soc").

As to going down hill for long distances, it still won't over charge the battery. It will use engine braking instead of regenerative braking once the battery is at the max permitted soc. If that's not enough, you just have to use the hydraulic brakes like one of those primitive ICE only vehicles.

 

Not really necessary. It's charging very slowly and the battery fan is kept at max speed.

 

"update"
I do not top off HV battery 5 weeks and see it is weaker, the engine works harder and more oil consumption.

 

I think that's is true. Btw, where can I find your instructions?

 

Did I say "let it cool before charging?" Yup, I did. Sorry about that. I meant to say to let it cool before DRIVING. Sure wish I could go back and edit that one. During the charge/discharge process, there is no need to wait between charge/discharge, as I said in another post, because it's not heating that much. It's just a really bad idea to jump in and drive it right after jamming every electron into the battery that it can hold. The car's computer doesn't know about that yet and will try to add more.

As for instruction, I use the ones from the manufacturer:
Prolong Grid Charger Product Guides – Hybrid Automotive

They are quite good when followed correctly.

 

Very nice. have fun. We are working our way east to the other mouse wallet extractor location

 

You need your sleep. Never post or start a reconditioning process when tired.
Your photo is downside up.

 

That's what makes laptops nice. You can flip them over and see the picture right-side up. A phone will keep the picture upside down.