Water cooling plate assembly, water cooling system, battery, box body of battery and power utilization device

The invention provides a water cooling plate assembly, a water cooling system, a battery, a box body of the battery and an electric device, and the water cooling plate assembly comprises a harmonica-shaped tube plate, a first current collector and a second current collector. An outer-layer cooling channel and an inner-layer cooling channel located on the inner side of the outer-layer cooling channel are formed in the harmonica-shaped tube plate, and one of the outer-layer cooling channel and the inner-layer cooling channel is a liquid cooling channel. The first current collector is arranged at the first end of the harmonica-shaped tube plate in the length direction and forms a first current collecting space communicated with a port in one end of the liquid cooling channel, and the first current collector further forms a first liquid inlet and a first liquid outlet through which cooling liquid flows in and out of the first current collecting space. The second current collector is arranged at a second end in the length direction of the harmonica-shaped tube plate and forms a second current collecting space communicated with a port at the other end of the liquid cooling channel; and the second current collector further forms a second liquid inlet and a second liquid outlet through which the cooling liquid flows in and out of the second current collecting space.