This comes to mind:

http://www.linear.com/products/multicell_battery_stack_monitor

I also did a battery monitoring system for an electric vehicle that had
something like 10 12V batteries in series. Each battery ran a PIC
measuring the battery voltage (and other stuff). The result was put in a
packet that included the battery number. This was sent out the PIC UART to
an opto coupler. The Opto coupler drove an open collector bus that linked
all the batteries together. The monitors randomly transmit their results.
There are occasionally collisions causing the packet to be thrown out (due
to CRC error). But, overall, every battery got through at least once a
second.

Harold


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