I plan on making my own BMS for a 12S battery pack, and I found TI's TIDA BMS board and decided to use it as a reference to gain some understanding on how to develop safety circuit for the board. While studying the schematic of the board, at a point they are using different reference for something I don't properly.
As you can see, the D46 and D45 Schottky Diodes are connected to PACK- pin, while the Zener(s) are connected to GND. Also, what is the purpose of shorting PACK- with PACK+ pins? Shouldn't the PACK- pin connected to the GND?
I went through this answer, but I don't think the purpose of different reference is the same in this case. Thank you in advance.