Current collector calendering device

Abstract

The utility model discloses a current collector calendaring device which is used for calendaring a current collector through two calendaring rollers arranged side by side, a concave-convex structure is arranged on the roller surface of at least one of the two calendaring rollers, the current collector with the concave-convex structure can be obtained, the size and shape of the concave-convex structure are controllable, and the yield of the current collector can be improved. The preparation is simple and convenient, the process difficulty and the preparation cost are reduced, and meanwhile, chemical pollution is avoided. And a dust removal mechanism is further arranged to remove dust, suspended particles and other impurities attached to the calendering rollers, so that the current collector is prevented from being polluted.

Description

Technical Field

[0001] The utility model generally relates to the technical field of lithium batteries, and particularly relates to a current collector rolling device. Background Art

[0002] In the related art, a copper current collector with a specific morphology is obtained by a preparation method of a thin film material for suppressing the growth of lithium dendrites. For example, using 1,2-dimethylimidazole as a raw material, adding an appropriate amount of high molecular polyacrylonitrile as an adhesive, and using electrospinning technology under high voltage conditions to prepare an electrospinning product. Subsequently, it is soaked in a methanol solution of Co2+ ions and a methanol solution of 1,2-dimethylimidazole for a certain time in sequence, and the process is repeated three times. Then, it is taken out and dried, and then subjected to high-temperature sintering in a tube furnace in an N2 atmosphere to obtain a thin film material based on a metal-organic framework derivative structure for suppressing the growth of lithium dendrites.

[0003] However, this technology is cumbersome, and the yield rate during the preparation process is uncontrollable. The compatibility between the thin film and the metal lithium layer and the current collector is unknown. The preparation process is cumbersome, the chemical pollution is large, and the cost is relatively high. Summary of the Utility Model

[0004] This application expects to provide a current collector rolling device, which is at least used to improve the yield rate of the current collector; the preparation is simple and convenient, reducing the process difficulty and preparation cost. At the same time, chemical pollution is avoided.

[0005] The utility model provides a current collector rolling device, which includes two rolling rollers arranged side by side for rolling the current collector; among the two rolling rollers, at least one roller surface is provided with a concavo-convex structure.

[0006] As a realizable manner, the concavo-convex structure includes a spiral concavo-convex structure, a circular ring side-by-side concavo-convex structure, and a straight line side-by-side concavo-convex structure.

[0007] As a realizable manner, the heights of the protrusions of the concavo-convex structure are equal or unequal, the depths of the grooves of the concavo-convex structure are equal or unequal, the shapes of the protrusions are regular or irregular, and the shapes of the grooves are regular or irregular; the height of the protrusion is 0.01 μm to 3 μm, and the depth of the groove is 0.01 μm to 3 μm.

[0008] As a realizable manner, the concavo-convex structure includes a plurality of grooves, and the distance between the adjacent side walls of any two adjacent grooves is 0.01 μm to 1 μm, and the width of the groove opening is 0.01 μm to 1 μm.

[0009] As a realizable manner, it further includes a dust removal mechanism. The dust removal mechanism cooperates with the rolling roller to remove particulate foreign matters on the roller surface of the rolling roller.

[0010] As an implementable manner, the dust removal mechanism includes a material receiving roller and a material feeding roller. The axes of the material receiving roller, the material feeding roller and the calender roller are arranged in parallel.

[0011] A dust sticking belt is wound around the material feeding roller. The material receiving roller cooperates with the material feeding roller to wind up the dust sticking belt, and the dust sticking belt is in contact with the roller surface of the calender roller.

[0012] As an implementable manner, the dust removal mechanism further includes a turning roller. The axis of the turning roller is arranged in parallel with the axis of the calender roller.

[0013] The dust sticking belt on the material feeding roller passes through the turning roller and is wound up by the material receiving roller.

[0014] As an implementable manner, there are at least two dust removal mechanisms. Two dust removal mechanisms are symmetrically arranged with respect to the calender roller, or multiple dust removal mechanisms are arranged around the calender roller.

[0015] As an implementable manner, the dust removal mechanism includes a dust sticking roller. The axis of the dust sticking roller is arranged in parallel with the axis of the calender roller, and the dust sticking roller is externally tangent to the calender roller.

[0016] As an implementable manner, the dust removal mechanism further includes a dust removal scraper and a first dust suction member. The dust removal scraper is in contact with the dust sticking roller, and the suction nozzle of the first dust suction member faces the position where the dust removal scraper is in contact with the dust sticking roller.

[0017] As an implementable manner, the first dust suction member is in a closed shape. The first dust suction member surrounds the dust removal scraper.

[0018] As an implementable manner, the dust removal mechanism includes a dust removal brush and a second dust suction member. The dust removal brush is in contact with the calender roller, and the suction nozzle of the second dust suction member faces the position where the dust removal brush is in contact with the calender roller.

[0019] In the above solution, two calender rollers arranged side by side are used to calender the current collector. At least one of the two calender rollers has a concavo-convex structure on its roller surface, and a current collector with a concavo-convex structure can be obtained. The size and shape of the concavo-convex structure are controllable, which helps to improve the yield rate of the current collector; the preparation is simple and convenient, reducing the process difficulty and preparation cost. At the same time, chemical pollution is avoided. A dust removal mechanism is also provided to remove dust, suspended particulate matter and other impurities attached to the calender roller to avoid contaminating the current collector. Description of the Drawings

[0020] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present application will become more obvious:

[0021] Figure 1 Structural schematic diagram of the first current collector rolling device provided by an embodiment of the present utility model;

[0022] Figure 2 Structural schematic diagram of the second current collector rolling device provided by an embodiment of the present utility model;

[0023] Figure 3 Structural schematic diagram of the third current collector rolling device provided by an embodiment of the present utility model;

[0024] Figure 4 Structural schematic diagram of the fourth current collector rolling device provided by an embodiment of the present utility model;

[0025] Figure 5 Structural schematic diagram of the dust removal scraper and the first dust suction member provided by an embodiment of the present utility model;

[0026] Figure 6 Structural schematic diagram of the fifth current collector rolling device provided by an embodiment of the present utility model;

[0027] Figure 7 Structural schematic diagram of the dust removal brush and the second dust suction member provided by an embodiment of the present utility model;

[0028] Figure 8 Structural schematic diagram of the first rolling roller provided by an embodiment of the present utility model;

[0029] Figure 9 Structural schematic diagram of the second rolling roller provided by an embodiment of the present utility model;

[0030] Figure 10 Structural schematic diagram of the third rolling roller provided by an embodiment of the present utility model;

[0031] Figure 11 Partial sectional view schematic diagram of the rolling roller provided by an embodiment of the present utility model;

[0032] Figure 12 Structural schematic diagram of the current collector provided by an embodiment of the present utility model;

[0033] Rolling roller 10, protrusion 11, groove 12, current collector 20;

[0034] Dust removal mechanism 30, unwinding roller 31, rewinding roller 32, turning roller 33, dust sticking tape 34, dust sticking roller 35, first dust sticking roller 35a, second dust sticking roller 35b, dust removal scraper 36, first dust suction member 37, dust removal brush 38, second dust suction member 39;

[0035] Drive roller 40, upper power roller 51, lower power roller 52, lithium ion layer 60. Detailed implementation manners

[0036] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the utility model are shown in the drawings.

[0037] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0038] At least refer to Figures 1 - 12 As shown, an example of the present utility model provides a calendering device for a current collector 20, including two calendering rollers 10 arranged side by side for calendering the current collector 20; among the two calendering rollers 10, at least one has a concavo-convex structure on its roller surface.

[0039] Among them, in one embodiment, as Figure 8 shown, the concavo-convex structure can be a spiral concavo-convex structure; in another embodiment, as Figure 9 shown, the concavo-convex structure can be a linear side-by-side concavo-convex structure; in still another embodiment, as Figure 10 shown, the concavo-convex structure can be a circular ring side-by-side concavo-convex structure. Of course, it can be understood that the concavo-convex structure can also include other structures, and this embodiment will not list them one by one.

[0040] The concavo-convex structure includes a plurality of protrusions 11 and a plurality of grooves 12, and the protrusions 11 and the grooves 12 are arranged alternately.

[0041] As Figure 11 shown, the heights of the protrusions 11 are equal or unequal, and the height of the protrusion 11 is 0.01 μm to 3 μm. The shape of the protrusion 11 can be square, rectangular, semi-elliptical, triangular, semi-circular,..., and the shape of the protrusion 11 can be a regular shape or an irregular shape.

[0042] The depths of the grooves 12 are equal or unequal, and the depth of the groove 12 is 0.01 μm to 3 μm. The shape of the groove 12 can be square, rectangular, semi-elliptical, triangular, semi-circular,..., and the shape of the groove 12 can be a regular shape or an irregular shape.

[0043] The distance between the adjacent side walls of any two adjacent grooves 12 is 0.01 μm to 1 μm, where the adjacent side walls of the two adjacent grooves 12 are the protruding walls of the protrusion 11 located between the two grooves 12. The width of the opening of the groove 12 is 0.01 μm to 1 μm.

[0044] Among them, the calender roll 10 is made of carbon steel or stainless steel, and the concave-convex structure on the roll surface of the calender roll 10 can be, but is not limited to, formed by laser.

[0045] When a concave-convex structure is provided on the roll surface of one of the two calender rolls 10, a concave-convex pattern is formed on one surface of the current collector 20, as Figures 8 - 10 shown. When concave-convex structures are provided on the roll surfaces of both of the two calender rolls 10, concave-convex patterns are formed on both surfaces of the current collector 20.

[0046] Then, metallic lithium is deposited on the concave-convex pattern to form a lithium ion layer 60 by means of chemical vapor deposition, vacuum evaporation deposition, etc., as Figure 12 shown.

[0047] In the above solution, two calender rolls 10 arranged side by side are used to calender the current collector 20. At least one of the two calender rolls 10 has a concave-convex structure on its roll surface, so that a current collector 20 with a concave-convex structure can be obtained. The size and shape of the concave-convex structure are controllable, which helps to improve the yield rate of the current collector 20; the preparation is simple and convenient, the process difficulty and the preparation cost are reduced, and at the same time, chemical pollution is avoided.

[0048] Among them, the following embodiments are described with concave-convex structures provided on the roll surfaces of both of the two calender rolls 10:

[0049] In actual work, during the process of the calender roll 10 calendering the current collector 20, dust, suspended particulate matter, and other impurities in the working environment will adhere to the calender roll 10. In order to prevent the calender roll 10 from polluting the current collector 20 during the process of calendering the current collector 20, a dust removal mechanism 30 is further provided in this embodiment to remove the dust, suspended particulate matter, and other impurities adhering to the calender roll 10.

[0050] As an implementable manner, the dust removal mechanism 30 includes a take-up roll 32 and a pay-off roll 31.

[0051] The axis of the take-up roll 32, the axis of the pay-off roll 31, and the axis of the calender roll 10 are arranged in parallel. A dust sticking tape 34 is wound around the pay-off roll 31. The take-up roll 32 cooperates with the pay-off roll 31 to wind up the dust sticking tape 34, and the dust sticking tape 34 is in contact with the roll surface of the calender roll 10.

[0052] In a specific embodiment, as Figure 1 shown, in the up-down direction, an upper driving roll 51, a transmission roll 40, the upper calender roll 10, the lower calender roll 10, and a lower driving roll 52 are arranged in sequence. The upper driving roll 51 is in friction transmission with the transmission roll 40, and the transmission roll 40 is in friction transmission with the upper calender roll 10, so that the upper calender roll 10 rotates. The lower calender roll 10 is in friction transmission with the lower driving roll 52, so that the lower calender roll 10 rotates. Among them, the two calender rolls 10 rotate in the same direction.

[0053] The dust removal mechanism 30 includes a feeding roller 31, a winding roller 32, and a turning roller 33. A dust sticking belt 34 is wound around the feeding roller 31. The dust sticking belt 34 is output from the feeding roller 31, passes through the turning roller 33, and then reaches the winding roller 32. The adhering surface of the dust sticking belt 34 is in contact with the calender roller 10. Finally, the dust sticking belt 34 carrying dust, suspended particulate matters, and other impurities is wound up by the winding roller 32. In this way, the adhering surface of the dust sticking belt 34 cleans the dust, suspended particulate matters, and other impurities attached to the calender roller 10, and inhibits the pollution degree of the calender roller 10.

[0054] In addition, there is a small gap between the turning roller 33 and the calender roller 10 to allow the dust sticking belt 34 to pass through. And the turning roller 33 applies a force to the dust sticking belt 34, which helps the dust sticking belt 34 remove the dust, suspended particulate matters, and other impurities on the calender roller 10, and improves the dust removal effect.

[0055] Of course, it can be understood that in one embodiment, the upper calender roller 10 can be driven by an independent power source; the lower calender roller 10 can be driven by an independent power source. In another embodiment, another transmission roller 40 can be provided between the lower calender roller 10 and the lower power roller 52, etc., and the embodiments are not listed one by one here.

[0056] Wherein, the distance between the upper calender roller 10 and the lower calender roller 10 can be adjusted to adapt to current collectors 20 with different thicknesses. It should be noted that when the axial position of the upper calender roller 10 is adjusted, the axial positions of the upper power roller 51 and the transmission roller 40 are adjusted accordingly; correspondingly, when the axial position of the lower calender roller 10 is adjusted, the axial position of the lower power roller 52 is adjusted accordingly.

[0057] Furthermore, as Figure 1 shown, a dust removal mechanism 30 is provided on the left side of the upper calender roller 10, and another dust removal mechanism 30 is provided on the right side of the upper calender roller 10. The two dust removal mechanisms 30 are symmetrically arranged with respect to the upper calender roller 10. A dust removal mechanism 30 is provided on the left side of the lower calender roller 10, and another dust removal mechanism 30 is provided on the right side of the lower calender roller 10. The two dust removal mechanisms 30 are symmetrically arranged with respect to the lower calender roller 10. In this way, the contact area between the dust sticking belt 34 and the calender roller 10 is increased, which helps to further improve the dust removal effect.

[0058] Of course, it can be understood that multiple dust removal mechanisms 30 are arranged around the calender roller 10.

[0059] As an implementable manner, the dust removal mechanism 30 includes a dust sticking roller 35.

[0060] The axis of the dust sticking roller 35 is parallel to the axis of the calender roller 10, and the dust sticking roller 35 is externally tangent to the calender roller 10.

[0061] In a specific embodiment, as Figure 2 shown, on the left side of the upper calender roll 10, there is a dust sticking roll 35, and on the right side of the upper calender roll 10, there is another dust sticking roll 35. The two dust sticking rolls 35 are symmetrically arranged with respect to the upper calender roll 10, and both of the two dust sticking rolls 35 are externally tangent to the calender roll 10.

[0062] On the left side of the lower calender roll 10, there is a dust sticking roll 35, and on the right side of the lower calender roll 10, there is another dust sticking roll 35. The two dust sticking rolls 35 are symmetrically arranged with respect to the lower calender roll 10, and both of the two dust sticking rolls 35 are externally tangent to the calender roll 10.

[0063] Among them, the roll surface of the dust sticking roll 35 can be but is not limited to a rubber roll surface or a polyvinyl chloride roll surface. For example, rubber has softness and elasticity and is easy to adsorb dust, particulate matter, and other impurities.

[0064] Due to the rolling friction between the dust sticking roll 35 and the calender roll 10, the dust sticking roll 35 adsorbs the dust, particulate matter, and other impurities on the calender roll 10 to clean the calender roll 10.

[0065] Optionally, as Figure 4 and Figure 5 shown, the dust removal mechanism 30 further includes a dust removal scraper 36 and a first dust suction member 37.

[0066] Each dust sticking roll 35 is provided with a dust removal scraper 36 and a first dust suction member 37. The dust removal scraper 36 is in contact with the dust sticking roll 35, and the length of the dust removal scraper 36 is greater than or equal to the length of the dust sticking roll 35.

[0067] The first dust suction member 37 is in a closed shape, for example, it can be a rectangular ring, a square ring, a circular ring, etc. The first dust suction member 37 surrounds the dust removal scraper 36, and the suction nozzle of the first dust suction member 37 faces the position where the dust removal scraper 36 contacts the dust sticking roll. In this way, the first dust suction member 37 can timely absorb the dust, particulate matter, and other impurities separated from the dust sticking roll 35 to avoid polluting the surrounding environment with the dust, particulate matter, and other impurities.

[0068] Optionally, the number of the dust sticking rolls 35 can be 2, 3, 4,....

[0069] For example, as Figure 3 shown, there are two dust sticking rolls 35: a first dust sticking roll 35a and a second dust sticking roll 35b, and the diameter of the first dust sticking roll 35a is smaller than that of the second dust sticking roll 35b.

[0070] The first dust-removing roller 35a is externally tangent to the calender roll 10, and the first dust-removing roller 35a adsorbs dust, particulate matter, and other impurities on the calender roll 10; the second dust-removing roller 35b is externally tangent to the first dust-removing roller 35a, and the second dust-removing roller 35b adsorbs dust, particulate matter, and other impurities on the first dust-removing roller 35a, and the calender roll 10 is cleaned by a transfer method.

[0071] In addition, since the diameter of the second dust-removing roller 35b is larger than that of the first dust-removing roller 35a, the second dust-removing roller 35b can adsorb more dust, particulate matter, and other impurities, which helps the first dust-removing roller 35a to remove dust, particulate matter, and other impurities on the calender roll 10 for a long time.

[0072] It should be noted that when there are 3 dust-removing rollers 35, there are the first dust-removing roller 35a, the second dust-removing roller 35b, and the third dust-removing roller. The third dust-removing roller is externally tangent to the second dust-removing roller 35b, and the diameters of the first dust-removing roller 35a, the second dust-removing roller 35b, and the third dust-removing roller gradually increase. When there are 4, 5,... dust-removing rollers 35, the diameters of each dust-removing roller 35 are set with reference to the embodiment of 3 dust-removing rollers 35.

[0073] Optionally, the dust-removing mechanism 30 includes a dust-removing brush 38 and a second dust-absorbing member 39.

[0074] In a specific embodiment, as Figure 6 and Figure 7 shown, each dust-removing roller 35 is provided with a dust-removing brush 38 and a second dust-absorbing member 39. The length extension direction of the dust-removing brush 38 is parallel to the length extension direction of the calender roll 10, and the dust-removing brush 38 is disposed opposite to the calender roll 10. The dust-removing brush 38 is in contact with the calender roll 10, and the length of the dust-removing brush 38 is greater than or equal to the length of the calender roll 10, so that the dust-removing brush 38 can clean the entire calender roll 10.

[0075] The second dust-absorbing member 39 is in a closed shape, and can be, for example, a rectangular ring, a square ring, a circular ring, etc. The second dust-absorbing member 39 surrounds the dust-removing blade 36, and the suction nozzle of the second dust-absorbing member 39 faces the position where the dust-removing brush 38 contacts the calender roll 10. In this way, the second dust-absorbing member 39 can timely absorb dust, particulate matter, and other impurities separated from the calender roll 10, and avoid polluting the surrounding environment with dust, particulate matter, and other impurities.

[0076] The dust-removing brush 38 can be, but is not limited to, a brush, a nylon brush, or a polypropylene brush.

[0077] It should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the above text is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0078] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principle. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A current collector rolling device, characterized in that: It comprises two calendering rollers (10) arranged side by side and used for calendering a current collector (20); at least one of the two calendering rollers (10) is provided with a concave-convex structure on its roller surface.

2. The current collector rolling device according to claim 1, characterized in that: The heights of the protrusions (11) of the concavo-convex structure are equal or unequal, the depths of the grooves (12) of the concavo-convex structure are equal or unequal, the shapes of the protrusions (11) are regular or irregular, and the shapes of the grooves (12) are regular or irregular; the height of the protrusions (11) is 0.01 μm to 3 μm, and the depth of the grooves (12) is 0.01 μm to 3 μm.

3. The current collector rolling device according to claim 2, characterized in that: The concavo-convex structure comprises a plurality of grooves (12), the distance between adjacent groove side walls of any two adjacent grooves (12) is 0.01 μm to 1 μm, and the width of the opening of the groove (12) is 0.01 μm to 1 μm.

4. The current collector rolling device according to claim 1, characterized in that: It also comprises a dust removal mechanism (30), which cooperates with the calendering roller (10) to remove foreign matter on the roller surface of the calendering roller (10).

5. The current collector rolling device according to claim 4, characterized in that: The dust removal mechanism (30) comprises a receiving roller (32) and a discharging roller (31), wherein the axis of the receiving roller (32) and the axis of the discharging roller (31) are arranged parallel to the axis of the calendering roller (10). A dust-sticking belt (34) is wound around the unwinding roller (31), and the collecting roller (32) cooperates with the unwinding roller (31) to reel in the dust-sticking belt (34), and the dust-sticking belt (34) is in contact with the roller surface of the calendering roller (10).

6. The current collector rolling device according to claim 5, characterized in that: The dust removal mechanism (30) further comprises a steering roller (33), wherein the axis of the steering roller (33) is arranged parallel to the axis of the calendering roller (10). The dust-adhesive belt (34) on the unwinding roller (31) passes through the steering roller (33) and is wound up by the receiving roller (32).

7. The current collector rolling device according to claim 4, characterized in that: The dust removal mechanism (30) comprises a dust sticking roller (35), the axis of the dust sticking roller (35) is arranged parallel to the axis of the calendering roller (10), and the dust sticking roller (35) is arranged circumferentially with the calendering roller (10).

8. The current collector rolling device according to claim 7, characterized in that: The dust removal mechanism (30) further comprises a dust removal scraper (36) and a first dust suction piece (37); the dust removal scraper (36) is in contact with the dust sticking roller (35); and the suction nozzle of the first dust suction piece (37) is oriented toward the position where the dust removal scraper (36) is in contact with the dust sticking roller.

9. The current collector rolling device according to claim 8, characterized in that: The first dust suction member (37) is in a closed shape, and the first dust suction member (37) is arranged around the dust removal scraper (36).

10. The current collector rolling device according to claim 4, characterized in that: The dust removal mechanism (30) comprises a dust removal brush (38) and a second dust suction piece (39), wherein the dust removal brush (38) is in contact with the calendering roller (10), and the suction nozzle of the second dust suction piece (39) is oriented toward the position where the dust removal brush (38) is in contact with the calendering roller (10).

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