Vacuum cracking apparatus for power battery and cracking method thereof

A vacuum cracking apparatus for a power battery, comprising a cylinder and characterized by further comprising components sequentially arranged from top to bottom:

• a rolling device, arranged in the cylinder and comprising a plurality of pressure rollers arranged at intervals in a vertical direction and a fifth driving device for driving rotation of the pressure rollers;
• a first sealing device, arranged on the cylinder;
• a cracking device, arranged in the cylinder and comprising a first heater, a first air inlet, a first air outlet and a pipeline, the first heater being arranged outside the cylinder to make the said first heater to heat the outer surface of the cylinder, and the pipeline being connected with the first heater and the first air outlet;
• a second sealing device, arranged in the cylinder;
• a pyrolysis device, arranged in the cylinder and comprising a second heater, a second air inlet, a second air outlet, a first stirring paddle and a first driving device for driving rotation of the first stirring paddle, the second heater being arranged outside the cylinder to make the second heater to heat the outer surface of the cylinder, and the second heater being connected with the pipeline;
• and
• a third sealing device, arranged in the cylinder;
• wherein, the cracking device further comprises a first screw arranged transversely, a second driving device, a barrel body, a propeller, a third driving device and a first bottom plate, the second driving device is used for driving the first screw to rotate, the third driving device is used for driving the propeller to rotate, the barrel body is installed below the first screw, the first bottom plate is installed below the barrel body, and the propeller is located in the barrel body and installed on the first bottom plate;
• the diameter of the barrel body is smaller than that of the cylinder, an opening of the barrel body faces downward, and a clearance space is formed between the opening of the barrel body and the first bottom plate;
• and a spindle of the propeller is hollow, wherein a cracked material falls onto the second sealing device through the hollow portion of the spindle;
• air guide holes are formed in both of the spindle and the said barrel body;
• each of the first sealing device, the second sealing device and the third sealing device comprises a circular column, a plug and a fourth driving device, wherein the outer surface of the circular column is abutted against the inner surface of the cylinder, a guide groove is formed in the middle part of the circular column, and the plug moves up and down along the guide groove, the fourth driving device is used for driving the plug to move, and a plurality of pouring grooves are formed in the circular column and are connected with the guide groove and the bottom of the circular column respectively;
• the first stirring paddle comprises a first shaft and a plurality of blade groups, the plurality of blade groups are distributed on the first shaft at intervals, each blade group comprises a plurality of first blades, and the plurality of first blades are circumferentially arranged on the outer surface of the first shaft at intervals;
• and
• wherein the vacuum cracking apparatus is configured:
• (1) to feeding waste power batteries from the feed hopper and then entering a roller press for rolling treatment to obtain the crushed material;
• (2) to transport the crushed material to the cracking device for preheating, then heating and cracking under an inert atmosphere or vacuum to obtain cracked gas, solid cracked products and non-crackable products;
• (3) to transport the solid cracked products and the non-crackable products to the pyrolysis device for pyrolysis at an aerobic atmosphere to obtain pyrolysis gas and non-pyrolysis products, wherein the pyrolysis gas is mainly composed of carbon dioxide and water vapor, the non-pyrolysis products are mainly cathode material powder, anode material powder, copper powder, iron powder, aluminum powder and oxides of copper, iron and aluminum, and the propeller is used for the transmitting upward materials.