A TQFP package would be appropriate for this. Currently, there are 64 pins on it. Surface Mount is the mount number for this electronic part. It must be greater than -40°C to activate this system battery. Temperatures below 105°C are recommended. Total number of pins is 64. It is specified that the operating supply voltage for this battery instrument is 60V.
ISL78600ANZ Features
Available in TQFP Package with 64 Pins
ISL78600ANZ Applications
There are a lot of Intersil (Renesas Electronics America) ISL78600ANZ Battery Management ICs applications.