Battery pack

A battery pack, comprising:

• battery cells;
• a coolant tank for storing a coolant;
• a cooling circuit in communication with the coolant tank;
• a driving device for driving the coolant to flow;
• a fire extinguishing pipeline connected to the cooling circuit, wherein the fire extinguishing pipeline comprises a spraying pipe extending above the battery cells and forming an opening after being heated;
• and
• partitions provided between the battery cells and between battery modules, wherein the partitions have a characteristic of absorbing the coolant, the partitions comprise a heat insulation layer body for delaying heat spread, and the heat insulation layer body comprises an absorption layer for absorbing the coolant and a reinforcing layer, and
• wherein:
• the absorption layer is disposed on one single side of the reinforcing layer and faces the battery cells;
• or
• the heat insulation layer body further comprises a second absorption layer and the absorption layer and the second absorption layer are disposed on opposite sides of the reinforcing layer.