Battery pack

Provided is a battery pack in which temperature variations in a plurality of battery modules are suppressed and the internal layout is improved. A battery pack (7) mounted on a vehicle (1) is provided with a plurality of battery cooling units (41) arranged below three battery modules (31) arranged side by side in the front-rear direction. Each battery cooling unit is provided with a cooling medium sleeve (50) for cooling three battery modules, a supply pipe (60), and a discharge pipe (70). The cooling medium sleeve, the supply pipe, and the discharge pipe have flat shapes that are short in the vertical direction. The supply pipe (60) is disposed below the cooling medium jacket (50) and connected to a supply port (51) provided in a central portion (50c) of the cooling medium jacket (50) in the front-rear direction, and the discharge pipe (70) is disposed below the cooling medium jacket (50) and connected to a discharge port (52) provided in the central portion (50c) of the cooling medium jacket (50). 提供一种抑制多个蓄