Extrusion head for molding pole piece and molding device comprising same, and molding method and preparation method therefor

A molding device for an electrode sheet, which is a screw extruder, comprising an extrusion device housing and a screw coaxially arranged inside the extrusion device housing, wherein an end of the extrusion device housing is detachably connected with an extrusion head;

• the extrusion head comprises an extrusion head housing, wherein the extrusion head housing is internally provided with a through extrusion channel along the extrusion direction;
• the through extrusion channel is divided into a transition cavity and a molding cavity which are joined and communicated in sequence along the extrusion direction, and an inner wall annular surface of the transition cavity has a gradually reduced diameter along extrusion direction;
• the extrusion head housing is divided into a tapered section and a straight section which are joined in sequence along the extrusion direction, a small end surface of the tapered section is joined to the straight section, the tapered section is internally provided with the transition cavity along the extrusion direction, and the straight section is internally provided with the molding cavity along the extrusion direction;
• an inner wall annular surface of the transition cavity has a stepped structure with a gradually reduced diameter;
• the stepped structure of the transition cavity comprises three horizontal step surfaces and three vertical step surfaces connected with the horizontal step surfaces.

A molding device for an electrode sheet, which is a screw extruder, comprising an extrusion device housing and a screw coaxially arranged inside the extrusion device housing, wherein an end of the extrusion device housing is detachably connected with an extrusion head;

• the extrusion head comprises an extrusion head housing, wherein the extrusion head housing is internally provided with a through extrusion channel along extrusion direction;
• the through extrusion channel is divided into a transition cavity and a molding cavity which are joined and communicated in sequence along the extrusion direction, and an inner wall annular surface of the transition cavity has a gradually reduced diameter along the extrusion direction;
• an inner wall annular surface of the transition cavity has a stepped structure with a gradually reduced diameter;
• the stepped structure of the transition cavity comprises three horizontal step surfaces and three vertical step surfaces connected with the horizontal step surfaces.

A molding device for an electrode sheet, which is a screw extruder, comprising an extrusion device housing and a screw coaxially arranged inside the extrusion device housing, wherein an end of the extrusion device housing is detachably connected with an extrusion head;

• the extrusion head comprises an extrusion head housing, wherein the extrusion head housing is internally provided with a through extrusion channel along extrusion direction;
• the through extrusion channel is divided into a transition cavity and a molding cavity which are joined and communicated in sequence along the extrusion direction, and an inner wall annular surface of the transition cavity has a gradually reduced diameter along the extrusion direction;
• an inner wall annular surface of the transition cavity has a stepped structure with a gradually reduced diameter;
• the stepped structure of the transition cavity comprises three horizontal step surfaces and three vertical step surfaces connected with the horizontal step surfaces;
• the last vertical step surface along radial direction is joined to the molding cavity through an inclined surface.