Transverse multi-head negative pressure cleaning equipment for pole columns on two sides of square lithium battery

The invention discloses square lithium battery two-side pole transversely-placed multi-head negative pressure cleaning equipment which comprises an outer supporting mechanism, an inner supporting mechanism, an inner supporting mechanism, a cleaning butt-joint mechanism and a cleaning butt-joint mechanism, the outer supporting mechanism comprises a cuboid container with an opening in one side face, and the opening end of the cuboid container is provided with a plurality of cleaning butt-joint openings; the cleaning circulation mechanism is arranged in the outer supporting mechanism and comprises a cleaning circulation water tank, a cleaning pump, a ball valve and a cleaning backflow device, a backflow cavity is formed in the cleaning backflow device, a plurality of backflow openings communicated with the backflow cavity are formed outside the cleaning backflow device, and the backflow openings are communicated with a cleaning butt joint opening pipeline; a cleaning pump is connected between a liquid outlet of