Coating steel roller structure

Abstract

The invention discloses a coating steel roller structure which comprises a steel roller, and the two ends of the steel roller protrude in the radial direction of the steel roller. The current collector is arranged on the outer side of the steel roller in an abutting mode; a nozzle of the die head faces the current collector on the steel roller, and the slurry is coated on the surface of the current collector; wherein the thickness of the slurry on the current collector outside the middle part of the steel roller is greater than the thickness of the slurry on the current collector outside the two ends of the steel roller by changing the distance between the die head nozzle and the surface of the current collector. By changing the distance between the nozzle of the die head and the surface of the current collector on the steel roller, the thickness of the edges on the two sides of the coating can be reduced orderly, so that the effect of thinning the edge of the pole piece in the coating process is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery coating, and in particular to a coating steel roller structure. Background Art

[0002] The processing steps of lithium-ion batteries include mixing ingredients, coating, rolling, slitting, winding, assembly and baking, liquid injection, chemical composition, testing and packaging. Among them, the electrode surface density in the coating process is extremely important to battery safety.

[0003] The lithium-ion battery coating process is completed using a slit extrusion coating device, which results in thick edges in the slurry coating area at the edge of the current collector, causing serious product quality problems and a safety risk of battery lithium deposition. Summary of the invention

[0004] In view of the above-mentioned problems existing in the existing lithium-ion battery coating equipment, the present invention aims to provide a coating steel roller structure. By changing the distance between the die nozzle and the collector surface on the steel roller, the thickness of the edges on both sides of the coating can be thinned in an orderly manner, thereby achieving the effect of thinning the edges of the electrode in the coating process.

[0005] The specific technical solutions are as follows:

[0006] A coating steel roller structure, comprising:

[0007] A steel roller, both ends of which are protruding along the radial direction of the steel roller;

[0008] A current collector, the current collector being disposed against the outer side of the steel roller;

[0009] A die head, wherein the nozzle of the die head faces the current collector on the steel roller and applies the slurry to the surface of the current collector;

[0010] By changing the distance between the die nozzle and the surface of the current collector, the slurry thickness on the current collector outside the middle of the steel roller is greater than the slurry thickness on the current collector outside the two ends of the steel roller.

[0011] The above-mentioned coating steel roller structure, wherein, further comprises: a pressing roller, both ends of which are concave inwardly along the radial direction of the pressing roller;

[0012] The pressure roller is parallel to the steel roller;

[0013] The middle part of the pressure roller matches with the middle part of the steel roller, and the two ends of the pressure roller match with the two ends of the steel roller respectively;

[0014] The current collector passes between the steel roller and the pressure roller, and one side of the current collector is in contact with the steel roller, and the other side of the current collector is in contact with the pressure roller.

[0015] The above-mentioned coating steel roller structure, wherein the raised portion of the steel roller has a hollow structure inside and is connected to a negative pressure device, and the raised portion of the steel roller is provided with a plurality of adsorption holes connected to the interior thereof, and the negative pressure generated by the negative pressure device adsorbs both sides of the collector on the steel roller through the adsorption holes.

[0016] In the above-mentioned coating steel roller structure, the multiple adsorption holes on the raised part of the steel roller are arranged at equal intervals along the axial direction of the steel roller and / or the circumferential direction of the steel rod.

[0017] The above-mentioned coating steel roller structure, wherein the steel roller comprises: a steel roller body and raised sections arranged at both ends of the steel roller body;

[0018] The thickness of the slurry on the current collector outside the steel roller body is greater than the thickness of the slurry on the current collector outside the raised section;

[0019] The convex section has a hollow structure inside and a plurality of adsorption holes are arranged on the convex section.

[0020] The coating steel roller structure described above, wherein the raised section comprises a first inclined transition portion and a raised portion connected to each other, the first inclined transition portion being connected to the end of the steel roller body;

[0021] The transition part and the raised part are hollow structures, and a plurality of adsorption holes are provided on the transition part and the raised part;

[0022] The die head applies the slurry to the current collector located outside the steel rod body and the current collector located outside the transition portion.

[0023] The above-mentioned coating steel roller structure, wherein the length of the first inclined transition portion is smaller than the length of the raised portion.

[0024] The above-mentioned coating steel roller structure, wherein the steel roller body is a cylindrical structure, and the raised portion is a circular ring structure.

[0025] In the above-mentioned coating steel roller structure, the length of the raised section is less than 100 mm, and the distance between the outer diameter of the raised portion and the outer diameter of the steel roller body is 10 to 60 μm.

[0026] The above-mentioned coating steel roller structure, wherein the pressure roller comprises: a pressure roller body and concave sections arranged at both ends of the pressure roller body, and the convex section cooperates with the concave section;

[0027] The concave section includes a second inclined transition portion and a concave portion connected to each other, the first inclined transition portion cooperates with the second inclined transition portion, and the concave portion cooperates with the convex portion.

[0028] Compared with the prior art, the above technical solution has the following positive effects:

[0029] The present invention protrudes the structure at both ends of the steel roller radially outward and ensures the distance between the die head nozzle and the center line of the steel roller, thereby reducing the distance between the two ends of the steel roller and the die head nozzle, changing the distance between the die head nozzle and the collector surface on the two ends of the steel roller, reducing the thickness of the slurry on the collector surface on the two ends of the steel roller, and orderly thinning the thickness of the edges on both sides of the coating, thereby achieving the effect of thinning the edge of the pole piece in the coating process, improving product quality, and ensuring the safety of battery lithium deposition. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a coating steel roller structure of the present invention;

[0031] Figure 2 It is a structural schematic diagram of a steel roller in a coating steel roller structure of the present invention;

[0032] Figure 3 It is a structural cross-sectional view of a raised section of a steel roller in a coating steel roller structure of the present invention;

[0033] Figure 4 It is a schematic structural diagram of a pressure roller in a coating steel roller structure of the present invention;

[0034] In the attached drawings: 1. steel roller; 2. current collector; 3. die head; 4. slurry; 5. pressure roller; 6. adsorption holes; 7. hollow structure; 11. steel roller body; 12. raised section; 13. first inclined transition portion; 14. raised portion; 51. pressure roller body; 52. concave section; 53. second inclined transition portion; 54. concave portion. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0036] like Figures 1 to 4 As shown, a coating steel roller structure of a preferred embodiment is shown, including: a steel roller 1, a current collector 2 and a die head 3, the two ends of the steel roller 1 are protruded along the radial direction of the steel roller, the current collector 2 is arranged against the outside of the steel roller 1, the nozzle of the die head 3 is facing the current collector 2 on the steel roller 1, and the slurry 4 is coated on the surface of the current collector 2.

[0037] The distance between the nozzle of the die head 3 and the surface of the current collector 2 is changed so that the thickness of the slurry 4 on the current collector 2 outside the middle of the steel roller 1 is greater than the thickness of the slurry 4 on the current collector 2 outside the two ends of the steel roller 1.

[0038] Preferably, the nozzle of the die head 3 faces the axis of the steel roller 1 .

[0039] By reducing the distance between the nozzle of the die head 3 and the two side surfaces of the current collector 2, the thickness of the slurry 4 on the current collector 2 outside the middle of the steel roller 1 is made greater than the thickness of the slurry 4 on the current collector 2 outside the two ends of the steel roller 1.

[0040] Furthermore, as a preferred embodiment, the coating steel roller structure further includes: a pressure roller 5 , both ends of which are concave inwardly along the radial direction of the pressure roller 5 .

[0041] The pressure roller 5 is parallel to the steel roller 1 .

[0042] The middle part of the pressure roller 5 matches with the middle part of the steel roller 1 , and the two ends of the pressure roller 5 match with the two ends of the steel roller 1 respectively.

[0043] The current collector 2 passes between the steel roller 1 and the pressure roller 5 , with one side of the current collector 2 being in contact with the steel roller 1 , and the other side of the current collector 2 being in contact with the pressure roller 5 .

[0044] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation and protection scope of the present invention.

[0045] The present invention also has the following implementation modes based on the above:

[0046] In further embodiments of the present invention, please continue to refer to Figures 1 to 4 As shown, the raised portion of the steel roller 1 has a hollow structure inside and is connected to a negative pressure device (not shown in the figure). The raised portion of the steel roller 1 is provided with a plurality of adsorption holes 6 connected to the interior thereof. The negative pressure generated by the negative pressure device adsorbs both sides of the current collector 2 on the steel roller 1 through the adsorption holes 6.

[0047] In a further embodiment of the present invention, the diameter of the adsorption hole 6 is 2 mm.

[0048] In a further embodiment of the present invention, the plurality of adsorption holes 6 on the raised portion of the steel roller 1 are arranged at equal intervals along the axial direction of the steel roller 1 and / or the circumferential direction of the steel rod 1 .

[0049] In a further embodiment of the present invention, the raised portion is provided with an adsorption hole assembly, which is connected to the negative pressure device through the hollow space inside it. Through the negative pressure suction, the two sides of the current collector 2 can be adsorbed, and the current collector 2 is tightly attached to the surface of the coated steel roller 1 to prevent wrinkles and deformation on both sides of the current collector 2.

[0050] The adsorption hole assembly comprises: a plurality of adsorption hole groups, which are distributed at equal intervals along the axial direction of the steel roller 1 and distributed on the surface of the convex part along the axial direction of the convex part.

[0051] Each adsorption hole group includes a plurality of holes, and the plurality of holes are distributed at equal intervals along the circumference of the protruding portion. The holes are the above-mentioned adsorption holes.

[0052] In a further embodiment of the present invention, the steel roller 1 comprises: a steel roller body 11 and raised sections 12 provided at both ends of the steel roller body 11 .

[0053] The raised section 12 corresponds to the raised portion mentioned above.

[0054] The thickness of the slurry 4 on the current collector 2 outside the steel roller body 11 is greater than the thickness of the slurry 4 on the current collector 2 outside the raised section 12 .

[0055] The raised section 12 is a hollow structure, and a plurality of adsorption holes 6 are provided on the raised section 12 .

[0056] In a further embodiment of the present invention, the raised section 12 includes a first inclined transition portion 13 and a raised portion 14 connected to each other, and the first inclined transition portion 13 is connected to an end of the steel roller body 11 .

[0057] The first inclined transition portion 13 and the raised portion 14 are hollow structures, and a plurality of adsorption holes 6 are provided on the first inclined transition portion 13 and the raised portion 14 .

[0058] The die head 3 applies the slurry 4 onto the current collector 2 located outside the steel rod body 11 and onto the current collector 2 located outside the first inclined transition portion 13 .

[0059] Preferably, the sum of the length of the steel roller body 11 and the length of the first inclined transition section 13 is equal to the length of the nozzle of the die head 3 .

[0060] In a further embodiment of the present invention, the length of the first inclined transition portion 13 is smaller than the length of the protruding portion 14 .

[0061] In a further embodiment of the present invention, the steel roller body 11 is a cylindrical structure or a circular ring structure, and the raised portion 14 is a circular ring structure.

[0062] Preferably, the steel roller body 11 is a solid structure or a hollow structure. When the steel roller body 11 is a solid structure, the hollow structure in the raised section 12 is connected to the negative pressure device; when the steel roller body 11 is a hollow structure, the hollow structures in the steel roller body 11 and in the two raised sections 12 are connected, and the overall hollow structure only needs to be connected to one negative pressure device.

[0063] In a further embodiment of the present invention, the length of the raised section 12 is less than 100 mm.

[0064] In a further embodiment of the present invention, the distance between the outer diameter of the protrusion 14 and the outer diameter of the steel roller body 11 is 10-60 μm.

[0065] In a further embodiment of the present invention, the length of the protrusion 14 is less than 10 mm.

[0066] In a further embodiment of the present invention, the pressure roller 5 comprises: a pressure roller body 51 and concave sections 52 provided at both ends of the pressure roller body 51 , and the convex section 12 cooperates with the concave section 52 .

[0067] The concave section 52 includes a second inclined transition portion 53 and a concave portion 54 connected to each other. The first inclined transition portion 13 cooperates with the second inclined transition portion 53 , and the concave portion 54 cooperates with the convex portion 14 .

[0068] The roller body 51 is a cylindrical structure, the inner concave portion 54 is a cylindrical structure, and the second inclined transition portion 53 is a truncated cone structure.

[0069] The present invention protrudes the structure at both ends of the steel roller 1 radially outward, and ensures the distance between the nozzle of the die head 3 and the center line of the steel roller 1, thereby reducing the distance between the two ends of the steel roller 1 and the nozzle of the die head 3, changing the distance between the nozzle of the die head 3 and the surface of the current collector 2 on the two ends of the steel roller 1, reducing the thickness of the slurry 4 on the surface of the current collector 2 on the two ends of the steel roller 1, and orderly thinning the thickness of the edges on both sides of the coating, thereby achieving the effect of thinning the edge of the pole piece in the coating process, improving product quality, and ensuring the safety of battery lithium deposition.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A coating steel roller structure, characterized in that: include: A steel roller, both ends of which are protruding along the radial direction of the steel roller; A current collector, the current collector being disposed against the outer side of the steel roller; A die head, wherein the nozzle of the die head faces the current collector on the steel roller and applies the slurry to the surface of the current collector; By changing the distance between the die nozzle and the surface of the current collector, the slurry thickness on the current collector outside the middle of the steel roller is greater than the slurry thickness on the current collector outside the two ends of the steel roller.

2. The coating steel roller structure according to claim 1, characterized in that: Also includes: A pressure roller, both ends of which are concave inwardly along the radial direction of the pressure roller; The pressure roller is parallel to the steel roller; The middle part of the pressure roller matches with the middle part of the steel roller, and the two ends of the pressure roller match with the two ends of the steel roller respectively; The current collector passes between the steel roller and the pressure roller, and one side of the current collector is in contact with the steel roller, and the other side of the current collector is in contact with the pressure roller.

3. The coating steel roller structure according to claim 2, characterized in that: The raised portion of the steel roller has a hollow structure inside and is connected to a negative pressure device. The raised portion of the steel roller is provided with a plurality of adsorption holes connected to the interior thereof. The negative pressure generated by the negative pressure device adsorbs both sides of the current collector on the steel roller through the adsorption holes.

4. The coating steel roller structure according to claim 3, characterized in that: The multiple adsorption holes on the raised portion of the steel roller are arranged at equal intervals along the axial direction of the steel roller and / or the circumferential direction of the steel rod.

5. The coating steel roller structure according to claim 3, characterized in that: The steel roller comprises: a steel roller body and raised sections arranged at both ends of the steel roller body; The thickness of the slurry on the current collector outside the steel roller body is greater than the thickness of the slurry on the current collector outside the raised section; The convex section has a hollow structure inside and a plurality of adsorption holes are arranged on the convex section.

6. The coating steel roller structure according to claim 5, characterized in that: The raised section comprises a first inclined transition portion and a raised portion connected to each other, wherein the first inclined transition portion is connected to the end of the steel roller body; The transition part and the raised part are hollow structures, and a plurality of adsorption holes are provided on the transition part and the raised part; The die head applies the slurry to the current collector located outside the steel rod body and the current collector located outside the transition portion.

7. The coating steel roller structure according to claim 6, characterized in that: The length of the first inclined transition portion is smaller than the length of the protruding portion.

8. The coating steel roller structure according to claim 6, characterized in that: The steel roller body is a cylindrical structure, and the raised portion is a circular ring structure.

9. The coating steel roller structure according to claim 6, characterized in that: The length of the protruding section is less than 100 mm, and the distance between the outer diameter of the protruding portion and the outer diameter of the steel roller body is 10 to 60 μm.

10. The coating steel roller structure according to claim 6, characterized in that: The pressing roller comprises: a pressing roller body and concave sections arranged at both ends of the pressing roller body, and the convex section cooperates with the concave section; The concave section includes a second inclined transition portion and a concave portion connected to each other, the first inclined transition portion cooperates with the second inclined transition portion, and the concave portion cooperates with the convex portion.

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