Prius cell block 2 failing

What does this even mean? This statement indicates you do to understand what balancing is. To balance a module, you need to gently over-charge the module (@ < 350mA) so that the lowest charged cell within that module gets fully charged. The nominal fully charged voltage is ~1.4 V per cell, so you should be looking for a fully charged module voltage of ~ 8.4 V. Any module that cannot attain ~8.4 V and is a multiple of ~1.2-1.4 V less, indicates a failed cell–which means throw out the module and replace.

What do you mean by that? A block (2 modules) that is indicated in Techstream with a P301x (presumably P3012, in your case), should charge faster under charge; and discharge faster under load, so what you are telling us does not seem consistent. More info would help.

Put your pack back together, if it is apart, and do a full balance charge followed by a three cycle discharge/charge regime. After that come back and revisit the state of each block. If you still get P301x codes, replace the ones identified.

 

That's a wide spread. See if a balance charge will close that down a bit.

And you got a P3012?

 

Does your discharger only do 1 module at a time?

You need to discharge all modules down to the same level (1st discharge to .8 V per cell or 4.8 V per module, before grid charging.

 

I can't see how it's possible to have 15.5v to 16.9v in the same pack.

 

So 1 module, or do really mean 6 modules (36 cells)?

BTW, You need to discharge all modules down to the same level (1st discharge to .8 V per cell or 4.8 V per module), before grid charging.

 

That's why I advised the OP to "put your pack back together, if it is apart, and do a full balance charge followed by a three cycle discharge/charge regime. After that come back and revisit the state of each block. If you still get P301x codes, replace the ones identified."

It could take a while, 1 block at a time.

 

waste of time! why would you mess about discharging one module at a time before doing a grid charge? why not just run the whole pack down to about 168v with a 100w load, while trying not to drive any modles too far under 6v .. then grid charge the thing 24hrs, repeat, repeat....

15.5 vs 16.9 is about the difference you would see if a cell had failed

 

Except, according to the OP, the 16.9 one is the outlier.

My thoughts, too. Not hard to build a light bulb discharger.

 

Gday Dolj

that would be pretty strange, but anything is possible!

So easy, and even easier for AU and NZ

 

Delete, duplicate

(keep getting post lag lately)

 

Probably better to run the pack down using a 60 watt. Going low with 100 might be too much

 

100 is good until the first module hits 6v that's when I swap to a 60 ... then a 40 ... 25 ..15.. nitey nite modules lol