Scouring pit grinding tool of high-volume polymer lithium battery

The invention provides a scouring pit grinding tool of a high-volume polymer lithium battery. A scouring pit mold is divided into an upper mold and a lower mold; the upper mold and the lower mold are located in corresponding positions; the upper mold includes a convex mold, an upper mold base and a hydraulic cylinder a; the hydraulic cylinder a includes a cylinder body and a piston rod; the piston rod is arranged in the cylinder body; the hydraulic cylinder a is mounted in the middle position of the bottom surface of the upper mold; the convex mold is arranged rightly below the hydraulic cylinder a; the lower mold includes a lower mold base, a hydraulic cylinder b and a cooling device; the upper surface of the lower mold base is a working plane; a scouring pit is formed in middle of the upper surface of the lower mold, is a square, and has the same shape size with the convex mold; a square frame is arranged rightly below the bottom of the scouring pit; and a cooling device is mounted rightly below the scouring pit, and is positioned in the square frame. The scouring pit grinding tool has the following beneficial effects: the depth of the scouring pit is changed according to the requirements of lithium battery shells with different specifications; and aluminum plastic films can be quickly shaped after pit scouring.