Yes, there are chips available to do what you want. One I came across recently is the MAX17043. That says it's a host-side device, you may want to explore Maxim's catalog for pack-side devices too.
Basically you can have each monitoring chip powered by its single cell. Then use optocouplers on the I2C lines to isolate the voltage, so the master Arduino can talk to each chip without exceeding its voltage limits.