Coating die head for coating battery pole piece and working method thereof

Abstract

The present invention relates to a coating die head for coating a battery pole piece and a working method thereof, comprising an upper die head, a middle die head and a lower die head which are matched in sequence from top to bottom, an upper gasket is sandwiched between the upper die head and the middle die head, and an upper coating opening for discharging is provided at the front end of the upper gasket; a lower gasket is sandwiched between the middle die head and the lower die head, and a lower coating opening for discharging is provided at the front end of the lower gasket, and an adjustment long groove extending along the coating width direction is provided on the bottom surface of the upper die head above the upper coating opening, and a plurality of flow blocks are provided in the adjustment long groove along its length direction, and the bottom surface of the flow block is parallel to the upper gasket, and a vertical adjustment component for driving the flow block to move vertically is connected to the top of the flow block. The present invention has a reasonable design, can conveniently adjust the coating and discharging of the upper die head, is easy to operate, has high adjustment accuracy, and reduces damage to the die head.

Description

Technical field:

[0002] The invention relates to a coating die head for coating a battery pole piece and a working method thereof. Background technology:

[0004] Coating is an essential process in the production of lithium-ion batteries. It is also a key process that directly affects the safety, capacity, consistency and other performance of the battery. A slit extruder is usually used to complete the coating operation. The slit coating die head of the existing slit extruder mainly includes an upper die head and a lower die head. An adjusting bolt is installed on the upper die head. When the adjusting bolt is turned to cause a slight deformation of the upper die head toward the lower die head, the width of the slit can be adjusted. However, this adjustment method using the screw bolt is not only inconvenient to operate, inefficient, and has poor adjustment accuracy, but also requires a high level of experience from the operator. Otherwise, the slit will be irreversibly deformed if not handled with care, which will lead to the scrapping of the die head. Summary of the invention:

[0006] The present invention makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a coating die head for coating battery pole pieces and a working method thereof, which has a reasonable structural design and is easy to use, and can improve the efficiency and accuracy of slit width adjustment.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a coating die head for coating battery pole pieces, comprising an upper die head, a middle die head and a lower die head that cooperate with each other in sequence from top to bottom, an upper gasket is sandwiched between the upper die head and the middle die head, and the front end of the upper gasket is provided with an upper coating opening for discharging; a lower gasket is sandwiched between the middle die head and the lower die head, and the front end of the lower gasket is provided with a lower coating opening for discharging, the bottom surface of the upper die head is provided with an adjustment groove extending along the coating width direction above the upper coating opening, and a plurality of baffles are arranged in the adjustment groove along its length direction, the bottom surface of the baffle block is parallel to the upper gasket, and the top of the baffle block is connected to a vertical adjustment component for driving the baffle block to move vertically.

[0008] Furthermore, the vertical adjustment assembly includes a support plate arranged at the upper end of the upper die head, and a plurality of differential heads corresponding to the positions of the plurality of baffle blocks are installed on the support plate. An adjustment rod is provided below the differential head and cooperates with the upper die head along the vertical sliding direction. The upper end of the adjustment rod is connected to the differential head via a coupling, and the lower end of the adjustment rod is fixedly connected to the top of the baffle block.

[0009] Furthermore, the bracket plate is provided with a plurality of mounting holes corresponding to the positions of the plurality of micrometer heads and used for mounting the micrometer heads, the side walls of the mounting holes are provided with notches for adjusting the tightness of the mounting holes, and the notches are provided with tightness adjustment bolts.

[0010] Furthermore, an anti-overflow plate fixed to the upper die head is arranged below the coupling, and a plurality of vertical through holes corresponding to the positions of the plurality of mounting holes are arranged on the anti-overflow plate, and a rubber ring is arranged below the vertical through holes; the adjustment rod slides through the vertical through holes.

[0011] Furthermore, an upper feed port is provided at the rear end of the upper die head, and an upper material storage chamber connected to the upper feed port is provided on the bottom surface of the upper die head behind the adjustment long groove, and the front end of the upper material storage chamber is connected to the rear end of the upper coating opening; an upper material mixing chamber is provided on the middle die head between the upper material storage chamber and the adjustment long groove, and the upper material mixing chamber is connected to the upper coating opening; a lower feed port is provided at the rear end of the lower die head, and a lower material storage chamber connected to the lower feed port is provided on the top surface of the lower die head, the front end of the lower material storage chamber is connected to the lower coating opening, and a lower material mixing chamber connected to the lower coating opening is provided on the front side of the lower material storage chamber.

[0012] Furthermore, an upper adjustment block fixed to the middle die head is provided in the upper material storage chamber, and the front and rear ends of the upper adjustment block are both upper arc surfaces adapted to the inner wall of the upper material storage chamber, and an upper discharge gap connected to the upper coating opening is formed between the upper arc surface at the front end of the upper adjustment block and the inner wall of the upper material storage chamber; a lower adjustment block fixed to the middle die head is provided in the lower material storage chamber, and the front and rear ends of the lower adjustment block are both lower arc surfaces adapted to the inner wall of the lower material storage chamber, and a lower discharge gap connected to the lower coating opening is formed between the lower arc surface at the front end of the lower adjustment block and the inner wall of the lower material storage chamber.

[0013] Furthermore, the bottom surface of the upper die head, the upper gasket, and the contact surface of the middle die head and the upper gasket are parallel and inclined with the front end lower and the rear end higher; the bottom surface of the middle die head and the top surface of the lower die head are both horizontal planes.

[0014] Furthermore, columnar pushing parts are provided at both left and right ends of the upper die head, and an upper die head displacement adjustment component is provided on the front side of the pushing part. The upper die head displacement adjustment component includes a base obliquely fixed to the middle die head, and a swing block that can swing back and forth is provided above the rear end of the base, and the rear end surface of the swing block abuts against the pushing block, and threaded through holes are provided at both front and rear ends of the swing block, and an adjusting bolt for driving the swing block to swing is threaded in the threaded through hole, and the bottom surface of the adjusting bolt abuts against the top surface of the base.

[0015] Furthermore, the middle part of the bottom surface of the swing block is connected to the base via a connecting part, and the base is provided with at least one elongated hole, and the base is locked and fixed to the middle die head via a locking bolt passing through the elongated hole.

[0016] Another technical solution adopted by the present invention is: a working method of a coating die for coating battery pole pieces, when working: slurry is input from an upper feed port and a lower feed port respectively, the slurry input from the upper feed port flows through an upper storage chamber and an upper material mixing chamber and is extruded from an upper coating opening, and the slurry input from the lower feed port flows through a lower storage chamber and a lower material mixing chamber and is extruded from a lower coating opening, thereby completing double-layer coating; when it is necessary to adjust the discharge of the upper coating opening, the adjustment rod is driven by the differential head to move vertically, and the adjustment rod drives the baffle block to move synchronously to adjust the distance between the bottom surface of the baffle block and the bottom surface of the upper die head.

[0017] Compared with the prior art, the present invention has the following effects: (1) the positions of the plurality of baffles are adjusted by differential heads respectively, so that the thickness of the slit can be adjusted separately at each position without affecting each other, which is not only convenient to adjust but also has high adjustment efficiency and good precision; (2) adjustment blocks are arranged in the upper and lower material storage chambers, and the gap formed by the arc surface at the front end of the adjustment block and the inner wall of the material storage chamber is used for discharging, thereby ensuring that the slurry is output evenly and stably; (3) by arranging swing blocks driven by bolts on both sides of the upper die head, the swing blocks are used to push the upper die head to generate displacement when they swing, which is not only convenient for adjusting the displacement of the upper die head in the front and rear directions but also has high displacement adjustment precision. Description of the drawings:

[0019] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the present invention

[0020] Figure 2 is a schematic diagram of a side cross-sectional structure of an embodiment of the present invention;

[0021] Figure 3 yes Figure 2 AA section diagram in;

[0022] Figure 4 is a schematic diagram of a side view of an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of the three-dimensional structure of the vertical adjustment assembly in an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the upper die head displacement adjustment assembly in an embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the three-dimensional structure of the upper die head in an embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the three-dimensional structure of the die head in an embodiment of the present invention;

[0027] Fig. 9 Schematic diagram of the three-dimensional structure of the lower die head in an embodiment of the present invention;

[0028] Fig.10 It is a schematic diagram of the three-dimensional structure of the upper adjustment block and the lower adjustment block in an embodiment of the present invention;

[0029] Fig.11 is a schematic diagram of the three-dimensional structure of the upper gasket in an embodiment of the present invention;

[0030] Fig.12 is a schematic diagram of the three-dimensional structure of the lower gasket in an embodiment of the present invention;

[0031] Fig.13 It is a schematic diagram of the structure when a groove is further provided on the bottom surface of the upper gasket in an embodiment of the present invention.

[0032] In the figure:

[0033] 1-upper die head; 2-middle die head; 3-lower die head; 4-upper gasket; 5-upper coating opening; 6-lower gasket; 7-lower coating opening; 8-adjustment slot; 9-blocking block; 10-vertical adjustment assembly; 11-bracket plate; 12-differential head; 13-adjustment rod; 14-coupling; 15-mounting hole; 16-notch; 17-tension adjustment bolt; 18-anti-overflow plate; 19-rubber ring; 20-positioning pin hole; 21-upper feed port; 22-upper Feed pipe; 23-upper material storage chamber; 24-upper material mixing chamber; 25-lower feed port; 26-lower feed pipe; 27-lower material storage chamber; 28-lower material mixing chamber; 29-upper adjustment block; 30-upper discharge gap; 31-lower adjustment block; 32-lower discharge gap; 33-push part; 34-upper die displacement adjustment assembly; 35-base; 36-swing block; 37-connecting part; 38-threaded through hole; 39-adjusting bolt; 40-long hole; 41-groove. Specific implementation method:

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] like Figures 1 to 12As shown, a coating die head for coating a battery pole piece of the present invention comprises an upper die head 1, a middle die head 2 and a lower die head 3 which are matched in sequence from top to bottom, an upper gasket 4 is sandwiched between the upper die head 1 and the middle die head 2, and a plurality of upper coating openings 5 ​​for extruding slurry are provided at the front end of the upper gasket 4; a lower gasket 6 is sandwiched between the middle die head 2 and the lower die head 3, and a plurality of lower coating openings 7 for extruding slurry are provided at the front end of the lower gasket 6, and an adjustment slot 8 extending along the coating width direction is provided on the bottom surface of the upper die head 1 above the upper coating opening 5, and a plurality of baffles 9 are provided in the adjustment slot 8 along the length direction thereof, and the bottom surface of the baffle 9 is parallel to the upper gasket 4, and the top of each baffle 9 is connected to a vertical adjustment component 10 for driving the baffle 9 to move vertically. The vertical height of the baffle is adjusted by the vertical adjustment component, thereby controlling the distance between the bottom surface of the baffle and the bottom surface of the upper die head, thereby controlling the slit thickness. At the same time, the heights of the various flow-blocking blocks can be different, so that the thickness of the output slurry can be adjusted according to actual needs.

[0038] In this embodiment, the vertical adjustment component 10 includes a support plate 11 arranged at the upper end of the upper die head 1, and a plurality of differential heads 12 corresponding to the positions of the plurality of baffle blocks 9 are installed on the support plate 11. An adjustment rod 13 is provided below the differential head 12, which is vertically slidably matched with the upper die head 1. The upper end of the adjustment rod 13 is connected to the differential head 12 via a coupling 14, and the lower end of the adjustment rod 13 is fixedly connected to the top of the baffle block 9.

[0039] In this embodiment, the bracket plate 11 is provided with a plurality of mounting holes 15 corresponding to the positions of the plurality of micrometer heads 12 and used for mounting the micrometer heads 12. The side walls of the mounting holes 15 are provided with notches 16 for adjusting the tightness of the mounting holes 15. The notches 16 are provided with tightness adjustment bolts 17 to ensure stable installation of the micrometer heads and avoid loosening of the micrometer heads. At the same time, the micrometer heads of different brands and models can be matched with subtle differences, making the present invention more widely adaptable.

[0040] In this embodiment, the coupling 14 is a clamping type rigid coupling, the top of which is connected to the differential head, and the bottom of which is connected to the adjustment rod. Since the coupling is not required to bear a large load, but only needs to have sufficient sensitivity, a rigid coupling is selected to reduce mass and volume.

[0041] In this embodiment, an anti-overflow plate 18 fixed to the upper die is provided below the coupling 14, and the anti-overflow plate 18 is provided with a plurality of vertical through holes corresponding to the positions of the plurality of mounting holes 15, and the adjustment rod 13 slides through the vertical through holes. Preferably, a rubber ring 19 is provided below the vertical through hole to prevent the liquid from flowing out of the gap between the baffle block and the upper die when the slit is too small.

[0042] In this embodiment, a plurality of positioning pin holes 20 are provided on the other side of the bracket plate 11 , and pins are provided in the positioning pin holes 20 , and the pins cooperate with the upper die head 1 to ensure installation accuracy.

[0043] In this embodiment, an upper feed port 21 is provided at the rear end of the upper die head 1, and the upper feed port 21 is connected to an upper feed pipe 22. An upper storage chamber 23 connected to the upper feed port 21 is provided on the bottom surface of the upper die head 1 behind the adjustment slot 8, and the front end of the upper storage chamber 23 is connected to the rear end of the upper coating opening 5; an upper mixing chamber 24 is provided on the middle die head 2 between the upper storage chamber 23 and the adjustment slot 8, and the upper mixing chamber 24 is connected to the upper coating opening 5; during operation, the slurry is input into the upper feed port 21 through the upper feed pipe 22, and then flows through the upper storage chamber 23 and the upper mixing chamber 24 in turn, and is extruded from the upper coating opening 5.

[0044] In this embodiment, a lower feed port 25 is provided at the rear end of the lower die head 3, and the lower feed port 25 is connected to a lower feed pipe 26. A lower storage chamber 27 connected to the lower feed port 25 is provided on the top surface of the lower die head 3, and a front end of the lower storage chamber 27 is connected to the lower coating opening 7. A lower mixing chamber 28 connected to the lower coating opening 7 is provided on the front side of the lower storage chamber 27. During operation, the slurry is input into the lower feed port 25 through the lower feed pipe 26, and then flows through the lower storage chamber 27 and the lower mixing chamber 28 in sequence and is extruded from the lower coating opening 7.

[0045] In this embodiment, the upper material storage chamber 23 and the lower material storage chamber 27 are both in the shape of long strips, and their cross-sections are semicircular; the upper material mixing chamber 24 and the lower material mixing chamber 28 are also in the shape of long strips, and their cross-sections are also semicircular. The upper material storage chamber 23 is provided with an upper adjustment block 29 fixed to the middle die head 2. The upper adjustment block, the upper gasket and the middle die head are fixed by bolts. The top and bottom surfaces of the upper adjustment block 29 are both flat surfaces. The front and rear ends of the upper adjustment block 29 are both upper arc surfaces adapted to the inner wall of the upper material storage chamber 23. An upper discharge gap 30 connected to the upper coating opening 5 is formed between the upper arc surface at the front end of the upper adjustment block 29 and the inner wall of the upper material storage chamber 23. There is also a gap between the upper arc surface at the rear end of the upper adjustment block 29 and the inner wall of the upper material storage chamber 23. Gap; the lower storage cavity 27 is provided with a lower adjustment block 31 fixed to the middle die head 2, the lower adjustment block, the lower gasket and the middle die head are fastened and fixed by bolts, the top and bottom surfaces of the lower adjustment block 31 are both flat, the front and rear ends of the lower adjustment block 31 are both lower arc surfaces adapted to the inner wall of the lower storage cavity 27, a lower discharge gap 32 connected to the lower coating opening 7 is formed between the lower arc surface at the front end of the lower adjustment block 31 and the inner wall of the lower storage cavity 27, and there is also a gap between the lower arc surface at the rear end of the lower adjustment block and the inner wall of the lower storage cavity. By fixing the adjustment blocks in the upper storage chamber 23 and the lower storage chamber 27, the pressure in the upper storage chamber 23 and the lower storage chamber 27 can be increased and a flow blocking effect can be achieved, which not only reduces the vortex generated by turbulence in the slurry in the storage chamber and plays a role in stabilizing the pressure, but also makes the output of the slurry more uniform and stable; at the same time, positioning pin holes are provided on the upper adjustment blocks and the lower adjustment blocks, and corresponding positioning pin holes are provided on the upper gasket and the lower gasket, which can facilitate the positioning of the gasket and facilitate assembly.

[0046] It should also be noted that if the bottom surface of the upper gasket 4 is also provided with a groove 41 for facilitating the flow of another slurry, since the thickness of the upper gasket 4 is relatively thin, when the slurry flows through the groove 41, the pressure generated by the slurry is likely to penetrate the upper gasket 4, resulting in material flow; and by fixing the upper adjustment block 29 in the upper storage cavity 23, the structural strength of the upper gasket 4 can be improved, and the upper gasket 4 can be effectively prevented from being penetrated. Fig.13 shown.

[0047] In this embodiment, the bottom surface of the upper die head 1, the upper gasket 4, and the contact surface of the middle die head 2 and the upper gasket 4 are parallel and inclined with the front end low and the rear end high; the bottom surface of the middle die head 2 and the top surface of the lower die head 3 are both horizontal planes.

[0048] In this embodiment, cylindrical pushing portions 33 are provided at both ends of the upper die head 1, and an upper die head displacement adjustment component 34 is provided on the front side of the pushing portion 33. The upper die head displacement adjustment component 34 includes a long strip base 35 obliquely fixed to the middle die head 2, and a rectangular swing block 36 is provided above the rear end of the base 35. The middle part of the bottom surface of the swing block 36 is connected to the base 35 via a connecting portion 37. The swing block 36 swings in the front and rear directions with the connecting portion 37 as the rotation center. The rear end surface of the swing block 36 abuts against the pushing block 33, and threaded through holes 38 are provided at the front and rear ends of the swing block 36. An adjusting bolt 39 for driving the swing block 36 to swing is screwed in the threaded through hole 38, and the bottom surface of the adjusting bolt 39 abuts against the top surface of the base 35. Since the adjusting bolts 39 at both ends are threadedly matched with the threaded through hole 38, when one of the adjusting bolts 39 is rotated, the distance between the bottom surface of one end of the swing block 36 and the base 35 can be adjusted, so that the swing block 36 can swing along the connecting portion 37, and the upper die head 1 is driven to move through the pushing portion 33 during the rotation, so as to achieve the displacement adjustment of the upper die head 1 in the front and rear directions. For example, when the upper die head 1 needs to be moved backward, the adjusting bolt 39 at the front end of the swing block 36 is turned, and the distance between the bottom surface of the front end of the swing block 36 and the base 35 increases. At this time, the swing block 36 swings backward around the connecting portion 37, and the swing block 36 pushes the upper die head 1 to move backward through the pushing portion 33. By setting the upper die head displacement adjustment component, only the bolt needs to be turned for adjustment, which is not only easy to operate, but also the displacement generated is small and controllable, which is suitable for fine adjustment of the upper die position. Compared with the traditional method of adding gaskets, the operation is more convenient and the adjustment accuracy is higher.

[0049] In this embodiment, arc-shaped transition portions are provided on both sides of the connection portion 37, so that the connection portion 37 is deformed as little as possible when subjected to bending moment, while avoiding stress concentration.

[0050] In this embodiment, the base 35 is provided with at least one long hole 40 extending in the front-to-back direction. The base 35 is locked and fixed to the middle die head 2 via a locking bolt passing through the long hole 40, so that the position of the base is adjustable, thereby improving adaptability.

[0051] In this embodiment, during operation: the slurry is respectively input to the upper feed port 21 and the lower feed port 25 through the upper feed pipe 22 and the lower feed pipe 26; the slurry input from the upper feed port 21 flows through the upper storage chamber 23 and the upper mixing chamber 24 and is extruded from the upper coating opening 5; the slurry input from the lower feed port 25 flows through the lower storage chamber 27 and the lower mixing chamber 28 and is extruded from the lower coating opening 7, thereby completing double-layer coating; when it is necessary to adjust the discharge of the upper coating opening 5, the adjustment rod 13 is driven vertically by the differential head 12, and the adjustment rod 13 drives the baffle block 9 to move synchronously to adjust the distance between the bottom surface of the baffle block 9 and the bottom surface of the upper die head 1.

[0052] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integrated molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0053] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0054] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A coating die head for coating a battery electrode, comprising an upper die head, a middle die head and a lower die head which are matched in sequence from top to bottom, an upper gasket is sandwiched between the upper die head and the middle die head, and an upper coating opening for discharging is provided at the front end of the upper gasket; a lower gasket is sandwiched between the middle die head and the lower die head, and a lower coating opening for discharging is provided at the front end of the lower gasket, characterized in that: The bottom surface of the upper die head is provided with an adjustment slot extending along the coating width direction above the upper coating opening, and a plurality of flow blocks are provided in the adjustment slot along its length direction, the bottom surface of the flow block is parallel to the upper gasket, and the top of the flow block is connected with a vertical adjustment component for driving the flow block to move vertically; The left and right ends of the upper die head are both provided with a columnar push portion, the front side of the push portion is provided with an upper die head displacement adjustment assembly, the upper die head displacement adjustment assembly includes a base obliquely fixed to the middle die head, a swing block that can swing forward and backward is provided above the rear end of the base, the rear end surface of the swing block abuts against the push block, the front and rear ends of the swing block are both provided with threaded through holes, the threaded through holes are threaded with an adjustment bolt for driving the swing block to swing, and the bottom surface of the adjustment bolt abuts against the top surface of the base; The vertical adjustment assembly includes a support plate arranged at the upper end of the upper die head, and a plurality of differential heads corresponding to the positions of the plurality of baffle blocks are installed on the support plate. An adjustment rod is provided below the differential head and cooperates with the upper die head along the vertical sliding direction. The upper end of the adjustment rod is connected to the differential head via a coupling, and the lower end of the adjustment rod is fixedly connected to the top of the baffle block.

2. The coating die head for coating a battery pole piece according to claim 1, characterized in that: The bracket plate is provided with a plurality of mounting holes corresponding to the positions of the plurality of micrometer heads and used for mounting the micrometer heads. The side walls of the mounting holes are provided with notches for adjusting the tightness of the mounting holes. The notches are provided with tightness adjustment bolts.

3. The coating die head for coating a battery pole piece according to claim 1, characterized in that: An anti-overflow plate fixed to the upper die head is arranged below the coupling, and a plurality of vertical through holes corresponding to the positions of the plurality of mounting holes are arranged on the anti-overflow plate, and a rubber ring is arranged below the vertical through holes; the adjustment rod slides through the vertical through holes.

4. The coating die head for coating a battery pole piece according to claim 1, characterized in that: An upper feed port is provided at the rear end of the upper die head, and an upper material storage chamber connected to the upper feed port is provided on the bottom surface of the upper die head behind the adjusting long groove, and the front end of the upper material storage chamber is connected to the rear end of the upper coating opening; an upper material mixing chamber is provided on the middle die head between the upper material storage chamber and the adjusting long groove, and the upper material mixing chamber is connected to the upper coating opening; a lower feed port is provided at the rear end of the lower die head, and a lower material storage chamber connected to the lower feed port is provided on the top surface of the lower die head, the front end of the lower material storage chamber is connected to the lower coating opening, and a lower material mixing chamber connected to the lower coating opening is provided on the front side of the lower material storage chamber.

5. The coating die head for coating the battery pole piece according to claim 4, characterized in that: An upper adjustment block fixed on the middle die head is provided in the upper material storage chamber, and the front and rear ends of the upper adjustment block are both upper arc surfaces adapted to the inner wall of the upper material storage chamber, and an upper discharge gap connected to the upper coating opening is formed between the upper arc surface at the front end of the upper adjustment block and the inner wall of the upper material storage chamber; a lower adjustment block fixed on the middle die head is provided in the lower material storage chamber, and the front and rear ends of the lower adjustment block are both lower arc surfaces adapted to the inner wall of the lower material storage chamber, and a lower discharge gap connected to the lower coating opening is formed between the lower arc surface at the front end of the lower adjustment block and the inner wall of the lower material storage chamber.

6. The coating die head for coating a battery pole piece according to claim 1, characterized in that: The bottom surface of the upper die head, the upper gasket, and the contact surface of the middle die head and the upper gasket are parallel and inclined with the front end lower and the rear end higher; the bottom surface of the middle die head and the top surface of the lower die head are both horizontal planes.

7. The coating die head for coating a battery pole piece according to claim 1, characterized in that: The middle part of the bottom surface of the swing block is connected to the base via a connecting part. The base is provided with at least one long hole. The base is locked and fixed to the middle die head via a locking bolt passing through the long hole.

8. A working method of a coating die head for coating a battery pole piece, characterized in that: It comprises a coating die head for coating battery pole pieces as claimed in claim 4, wherein when in operation: slurry is input from an upper feed port and a lower feed port respectively, the slurry input from the upper feed port flows through an upper storage chamber and an upper material mixing chamber and is extruded from an upper coating opening, and the slurry input from the lower feed port flows through a lower storage chamber and a lower material mixing chamber and is extruded from a lower coating opening, thereby completing double-layer coating; when it is necessary to adjust the discharge of the upper coating opening, the adjustment rod is driven by the differential head to move vertically, and the adjustment rod drives the baffle block to move synchronously, thereby adjusting the distance between the bottom surface of the baffle block and the bottom surface of the upper die head.

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