BATTERY PACK COOLING SYSTEM AND BATTERY PACK

Disclosed are a battery pack cooling system and a battery pack. The battery pack cooling system includes: a cooling pipeline (1), which is provided inside the battery pack, provided with an inlet (11) and an outlet (12), and configured to cool a battery module (8); an inlet connecting pipe (21), which extends into the battery pack and is connected to the inlet (11), and is provided with a first fool-proofing structure; and an outlet connecting pipe (31), which extends into the battery pack and is connected to the outlet (12), and is provided with a second fool-proofing structure, the second fool-proofing structure being different from the first fool-proofing structure. The cooling system is provided with different fool-proofing structures at the inlet connecting pipe (21) and the outlet connecting pipe (31) of the cooling pipeline (1), so that the inlet connecting pipe (21) cannot be connected to the outlet (12) of the cooling pipeline (1), and the outlet connecting pipe (31) cannot be connected to the inlet (11) of the cooling pipeline (1), thereby effectively avoiding the situation where a cooling liquid reversely flows in the battery pack due to the wrong connection of the inlet (11) and the outlet (12) of the cooling pipeline (1).