Volvo V60 battery pack

[manny]

Does anyone have a can log from a charging battery ?

Thanks Manny

[FJ3422]

Did you found out how the ballancing works?
If so can you tell me how it works.

Yes, I got it working but unfortunately didn't fully document it. If I remember correctly; module addressing for balancing is in the sample code (shared earlier in this topic), arangement of cell-bits still has to be done. Will check my paper notes. It was quite similar to the Chevy Volt way, but with cell balancing bits arranged differently.

[manny]

The can bus message is 0x1C;

First byte:
The addresses are 0x19 , 0x1A, 0x1B, ....

And the two bytes following are the bits for balancing.

I will try this

[manny]

So have bin doing some testing. but a am unable to trigger the balancing.

so if anyone has some info on this i would love to know.

Manny.

[FJ3422]

Checked my notes again; it really should be the 0x01C telegram,3 bytes long, 100ms rate.
- First byte: Module to balance (19,1A, 1B, 1C, 1D etc.) My note also says that 'FF' triggers all the modules to react. Original BMS-master cycles every 100ms to the next module, so the a triggered balancing will stay on for at least 1000ms.
- Second byte: Cell 1...8 balance command
- Third byte: Two LSB bits -> Cell 9..10 balance command

No checksum or whatever needed, balancing can be triggered with for example PCAN-View.
If I remember correctly, in one of the broadcast telegrams of the slaves they report which balancing resistors are active. There is a limit on the amount of active balancing resistors (dissipation limit), so sending FF FF FF might react different as expected : -)
Alternatively you could use an infared thermometer; that will indicate a temperature rise on an active balancing resistors within seconds.

[manny]

still on luck,

my test set up:
have one module on the workbench. A Arduino with a can interface is sending the can commands. I am able to read the cell voltages and temp sensors. savvy can to see the can traffic.

balance command:
address : 0x1C
byte 1 : 0x19, 0x1A, 0x1B,0x23, 0x22,0x21,0x29,0x2A,0x2B,0x33
byte 2 : 0x01
byte 3 : 0x00

byte 1 is cycling though the addresses.

I use a thermal camera to check the balancing.

do i need other connections to the module?
do i need all modules?
is there a enable balancing can command?

thanks for the advice

Manny

[Peter]

Hi Manny. Would it be possible to have a copy of your Arduino software to test please? Thanks. Peter

[FJ3422]

Are you just sending the 0x1C, or together with the other commands for reading the cell voltages/temperatures ?

- 0x16h (1byte, 100ms rate) requests specific slaves to report cell voltages (1Ah with incomplete pack, 1Bh when 10 modules connected)
- 0X17h (1byte, 100ms rate) requests all slaves to report cell voltages (00-10-20-30-40-50-60-70-80-90-A0-B0-C0-D0-E0-F0 cycle)

- 0X1Ah (1byte, 100ms rate) requests specific slave to report temperatures (1Ah with incomplete pack, 1Bh when 10 modules connected)
- 0x1Bh(1byte, 100ms rate) requests all slaves to report temperatures (00-10-20-30-40-50-60-70-80-90-A0-B0-C0-D0-E0-F0 cycle)

- 0x1Fh (2bytes, 100ms rate) request some other status messages.

I tested this with a complete pack and the original cable loom; There is a dasiy-chained IO-wire between all modules, that might be some error signal (Pin 4 = Digital input (internally 50K pulled up)). Maybe connect that wire to GND ?

[manny]

hi,

the 0x16h and 0x1Ah are new to me. will add it to the code. and see if it helps.

i am sending the 0x17, 0x1B, 0x1F and the 0x1C

the 0x1F message two bytes 0xFF and a counter.

the 0x16h and 0x1Ah are not in the log i made from the other complete pack I have.

thanks