CN222625095U - Coating back roller and pole piece preparation system - Google Patents

Abstract

The present disclosure provides a coating back roller and a pole piece preparation system. The coating back roller includes: a back roller body, including a first mold area roller segment, a second mold area roller segment and a third mold area roller segment arranged along the axial direction, wherein the radial dimension of the third mold area roller segment is greater than the radial dimension of the first mold area roller segment, the second mold area roller segment connects the first mold area roller segment and the third mold area roller segment, and the radial dimension gradually increases from the first mold area roller segment to the third mold area roller segment. The coating back roller of the embodiment of the present application sets the radial dimension of the third mold area roller segment to be greater than the radial dimension of the first mold area roller segment, and the radial dimension of the second mold area roller segment gradually increases from the first mold area roller segment to the third mold area roller segment, so that the prepared pole piece automatically forms a morphology with a thick middle and thin edges to alleviate the influence of the thick edge effect.

Description

Coating back roller and pole piece preparation system

Technical Field

The application relates to the field of batteries, in particular to a coating back roller and pole piece preparation system.

Background

In the field of batteries, a slurry coating method is generally adopted to prepare a pole piece of the battery. The slurry migrates to the uncoated areas of the slurry layer edges due to surface tension. Thus, after the pole piece dries, the migrating slurry will cause the slurry layer to have a greater edge thickness than the middle region, a phenomenon commonly referred to as "bead effect" during pole piece fabrication.

In the rolling process of the pole piece, the thick edge effect can lead to stress concentration at the edge position of the slurry layer, and the service life and safety of the battery are affected. Secondly, after the pole piece with the thick edge effect defect is rolled and pressed, a serious warping phenomenon can occur, and the cutting and winding process flow of the follow-up pole piece can be influenced. In addition, the thick side effect can also cause the cathode capacity at the edge position to exceed the specification after the cathode pole piece of the prepared lithium ion battery is assembled into the battery core, and lithium is easy to be separated from the anode region corresponding to the edge of the cathode mould region in the charging process.

In order to eliminate the thick edge effect, the slurry layer at the edge of the pole piece is thinned by arranging an external thinning device.

Disclosure of utility model

In view of the above problems, the application provides a coating back roller and a pole piece preparation system for relieving the phenomenon of thick edge effect generated in the pole piece manufacturing process.

The application provides a coating back roller, which comprises a back roller main body, wherein the back roller main body comprises a first die area roller section, a second die area roller section and a third die area roller section which are axially arranged, the radial dimension of the third die area roller section is larger than that of the first die area roller section, the second die area roller section is connected with the first die area roller section and the third die area roller section, and the radial dimension of the third die area roller section gradually increases from the first die area roller section to the third die area roller section.

In the technical scheme of the embodiment of the application, the back roller main body of the coating back roller comprises a first die area roller section, a second die area roller section and a third die area roller section, wherein the second die area roller section is connected with the first die area roller section and the third die area roller section, the radial size of the third die area roller section is larger than that of the first die area roller section, and the radial size of the second die area roller section gradually increases from the first die area roller section to the third die area roller section. The thickness of the pole piece part on the second die area roller section is smaller than that of the pole piece part on the first die area roller section when the pole piece is prepared, and the thickness of the pole piece prepared on the second die area roller section from the first die area roller section to the third die area roller section is gradually reduced, so that the thickness of the edge of the pole piece is thinned, and the influence of the thick edge effect on the quality of the pole piece is reduced. The coating back roller enables the prepared pole piece to automatically form the appearance of thick middle and thin edges, and the arrangement can reduce an external thinning device, thereby being beneficial to improving the production efficiency and reducing the cost.

In some embodiments, the coating back roll further comprises an adjustment device configured to change a size of at least one of the first, second, and third die section roll segments.

The size of at least one of the first die area roller section, the second die area roller section and the third die area roller section is changed by arranging the adjusting device, so that the thickness and the width of the pole piece corresponding to each roller section can be adjusted, different production requirements can be met, and the flexibility and the controllability of pole piece preparation can be improved.

In some embodiments, the adjustment device is disposed inside the back roller body.

The back roller body separates the adjusting device from the pole piece, coordinates the adjusting movement of the adjusting device and the transmission of the pole piece on the back roller, ensures that the adjusting device and the pole piece do not interfere with each other and saves space.

In some embodiments, the adjusting device is in driving connection with at least one of the first, second, and third die section roll segments and is configured to drive at least one of the first, second, and third die section roll segments to displace and/or deform relative to the other die section roll segments to change a dimension of at least one of the first, second, and third die section roll segments.

The adjusting device is in driving connection with at least one of the first die area roller section, the second die area roller section and the third die area roller section so as to change the size of at least one of the first die area roller section, the second die area roller section and the third die area roller section, thereby being beneficial to realizing the accurate control of pole piece preparation, improving the flexibility and compatibility of pole piece preparation by the coating back roller and reducing the cost of replacing the whole coating back roller due to different production requirements.

In some embodiments, the adjustment device includes a first adjustment portion configured to drive the first mold section roll segment to move in the axial direction and/or a second adjustment portion configured to drive deformation of at least one of the second mold section roll segment and the third mold section roll segment.

The first adjusting part and/or the second adjusting part are/is beneficial to flexibly controlling the sizes of the first die area roller section, the second die area roller section and the third die area roller section, the width size of the prepared pole piece can be mainly changed by adjusting the axial movement of the first die area roller section, and the thickness size of the thinning area of the prepared pole piece corresponding to the second die area roller section 112 can be mainly changed by adjusting the deformation of at least one of the second die area roller section and the third die area roller section.

In some embodiments, the adjustment device comprises the first adjustment portion comprising a screw threaded with an end face of the first die section roller section, the screw configured to be rotatably disposed about an axis of the coating back roller to drive movement of the first die section roller section by changing a mating position of the screw with the first die section roller section.

The screw is adopted to drive the first die area roller section, so that the structure is stable, and the adjustment, the assembly and the disassembly are convenient.

In some embodiments, the backing roll body includes a deformable sleeve for forming a surface of the second and third die section roll sections, the deformable sleeve being connected to the first die section roll section, the adjustment device includes the second adjustment portion including a plurality of support plates uniformly distributed radially inward of the second die section roll section in a circumferential direction of the coating backing roll and integrally forming an annular structure supporting the deformable sleeve, one end of the plurality of support plates being connected to an end face of the first die section roll section near the second die section, and a support plate position adjustment mechanism drivingly connected to each of the support plates and configured to change a spacing of one end of the plurality of support plates away from the first die section roll section so that the deformable sleeve follows the plurality of support plates.

The support plates and the support plate position adjusting mechanism are arranged to drive the support plates, so that the interval of one ends, far away from the first die area roller sections, of the support plates is changed, the interval is increased, the radial dimension of the second die area roller sections is increased, the interval is decreased, the radial dimension of the second die area roller sections is decreased, the deformable sleeve synchronously contracts or expands according to the change of the interval of the support plates, the change of the radial dimension of the second die area roller sections of the coating back roller can be continuous and accurate, the deformable sleeve plays a supporting role on the current collector film, and the flatness of the current collector film when supported on the deformable sleeve can be improved.

In some embodiments, the support plate position adjustment mechanism includes a moving member movably disposed along the axial direction, a rotating member having a first end hinged to the moving member and a second end hinged to the support plate, the support plate position adjustment mechanism being configured to change a spacing of one end of the plurality of support plates remote from the first mold section roller section by movement of the moving member to rotate the rotating member.

The translation of the moving part drives the rotating part to rotate relative to the moving part, and the supporting plate rotates around the joint with the first mold area roller section, so that the interval of one ends, far away from the first mold area roller section, of a plurality of supporting plates can be changed, the complex movement is simplified, the complex radial dimension change is changed by controlling the linear movement, the accurate adjustment of the interval of the supporting plates is facilitated, and the accurate adjustment of the radial dimension of the second mold area roller section is facilitated.

In some embodiments, the plurality of support plates form a frustoconical structure without a circumferential gap. The circular truncated cone-shaped structure enables the radial size of the coating back roller to be uniformly increased from the first die area roller section to the third die area roller section, is beneficial to enabling the outer surface of the second die area roller section to be closer to the circular truncated cone shape, and is beneficial to improving the uniformity of slurry coating of the pole piece corresponding to the second die area roller section along the length direction of the pole piece.

In some embodiments, the back roller body includes a plurality of the first mold section roller segments, and the second mold section roller segment and the third mold section roller segment are respectively disposed at two ends of each of the first mold section roller segments.

The two ends of the first die area roller section are respectively provided with the second die area roller section and the third die area roller section, so that the two ends of the pole piece can be thinned at the same time, and a pole lug area for forming a pole lug of an electrode can be formed at a position corresponding to the third die area roller section.

In some embodiments, one of the third mold section roll segments is included between two adjacent first mold section roll segments, and the third mold section roll segment is configured to have an axial dimension greater than or equal to twice the height value of the tab of the pole piece.

The tab areas corresponding to tabs of the pole pieces on two sides are formed through the same third die area roller section, so that the axial size of the coating back roller can be shortened, and the axial space is effectively utilized.

In some embodiments, the outer surface of the junction of the second mold section roll segment and the first mold section roll segment forms a transition fillet and/or the outer surface of the junction of the second mold section roll segment and the third mold section roll segment forms a transition fillet.

The second die area roller section is connected with the first die area roller section and/or the third die area roller section through the transition fillet, so that the boundary position can be smoothly transited, and the pole piece is prevented from being scratched to generate broken bands.

In some embodiments, the coating back roll further comprises an axially extending core rod positioned within the second and third mold section roll segments, the adjustment device being mounted to the core rod.

The core bar is arranged, the adjusting device is arranged on the core bar, the adjusting device can be stably arranged in the back roller main body, and the size of each die area roller section can be stably and accurately adjusted by the adjusting device.

In some embodiments, the adjustment device includes a first adjustment portion configured to drive the first mold section roll segment in the axial direction relative to the core pin, and the coating back roll further includes a guide portion configured to guide a direction of movement of the first mold section roll segment relative to the core pin and/or to limit rotation of the first mold section roll segment relative to the core pin about its own axis.

The coating back roller comprises a guide part, which is beneficial to limiting the moving direction and/or the moving range of the first die area roller section relative to the second die area roller section and the third die area roller section when the first die area roller section is driven to move, and is beneficial to keeping the integral structure of the coating back roller from undesired deformation caused by the movement of the first die area roller section.

In some embodiments, the guide portion includes a first guide structure disposed on one of the core pin and the first mold section roll segment, and a second guide structure disposed on the other of the core pin and the first mold section roll segment, the first guide structure and the second guide structure being in sliding engagement along the axial direction and/or the first guide structure and the second guide structure being in non-relative rotational engagement along the circumferential direction of the coating back roll.

The first guide structure and the second guide structure of the guide part are respectively arranged on the core bar and the first die area roller section, so that the number of parts for forming the guide part can be reduced and/or the occupied space of the guide part can be reduced on the basis of realizing the guide and/or limit functions.

A second aspect of the present application provides a pole piece preparation system comprising a coating back roller of the above embodiment for carrying and transporting a current collector film of a pole piece such that the current collector film conforms to the outer surfaces of adjacent first, second and third mold section roller sections of the back roller body to deform, and

A coating die including a slurry outlet opposite to the first and second die section roller sections of the coating back roller, configured to coat slurry for forming a coating layer on the current collector film of the back roller body through the slurry outlet, such that the coating die coats the slurry having a normal thickness at a position of the current collector film corresponding to the first die section roller section, coats the slurry having a gradually decreasing thickness at a position of the current collector film corresponding to the second die section roller section, and does not coat the slurry at a position of the current collector film corresponding to the third die section roller section.

The design causes the current collector film to generate deformation in the thickness direction on the coating back roller, the position corresponding to the first die area roller section and the second die area roller section is covered by the coated sizing agent, a coating layer with large middle thickness and small edge thickness is formed in the region of the current collector film forming the pole piece, the radial dimension of the second die area roller section of the back roller main body in the extending direction of the third die area roller section is gradually increased, the thickness of the coating layer corresponding to the second die area roller section is gradually reduced, and the effect of thinning the pole piece edge is achieved.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the present disclosure, and together with the description serve to explain the present disclosure. In the drawings:

FIG. 1 is a schematic illustration of the structure of a coating back roll according to some embodiments of the present application;

FIG. 2 is a schematic view in partial cross-section in the axial direction of a coating back roll according to some embodiments of the application, showing an adjustment device;

FIG. 3 is a schematic view of the structure of a support plate in a coating back roll according to some embodiments of the present application;

FIG. 4 is a schematic view of a partial structure of a pole piece manufacturing system according to some embodiments of the present application;

FIG. 5 is a schematic illustration of a process for preparing a pole piece according to some embodiments of the present application;

Fig. 6 is a schematic view of a partial cross-sectional structure in the axial direction of a coating back roller according to some embodiments of the application, in which a guide is shown.

Reference numerals in the specific embodiments are as follows:

100. Coating a back roller;

110. A back roll main body 111, a first die section roll section 111A, a guide hole 112, a second die section roll section 113, a third die section roll section 114, and a deformable sleeve;

1211. Screw rod, 1221, moving member, 1222, rotating member, 1223, support plate, first driving device M1, second driving device M2;

130. core bar, 131, guide bar;

300. a coating die, 310, a gasket, 320, a slurry outlet;

400. a slurry;

500. A current collector film;

600. And a conveying roller.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B, and may indicate that a exists alone, while a and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "fixed" and the like are to be construed broadly and include, for example, fixed connection, detachable connection, or integral therewith, mechanical connection, electrical connection, direct connection, indirect connection via an intermediary, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The excellent high energy density and high power density of the lithium ion battery endow the lithium ion battery with longer endurance and stronger instantaneous output capability, and meets the requirements of the fields of electric automobiles, consumer electronics, energy storage systems and the like. Under the pushing of environmental protection policy, the lithium ion battery is in great variety in the new energy automobile industry due to the characteristic of low carbon emission, the market share is continuously increased, and the market demand is also continuously increased.

The lithium ion battery generally adopts a slurry coating method to prepare the electrode plate. Positive and negative active materials (e.g., lithium cobaltate, lithium manganate, lithium iron phosphate, or graphite, etc.) are mixed with binders (e.g., polyvinylidene fluoride, PVDF, etc.), conductive agents (e.g., carbon black, etc.) in proportion, and the above powdery substances are uniformly dispersed and stirred into slurry using a solvent to prepare a slurry. The prepared slurry is coated on a current collector film to form an electrode. The current collector film coated with the slurry is dried by a drying box or a hot air drying tunnel, so that a firmly attached coating layer is formed on the current collector.

In order to solve the problem that the thickness of the edge of a coating layer after a pole piece is dried is greater than the thick edge effect of the thickness of a middle area, the scheme designs a coating back roller with radial dimension difference in the surface area, and utilizes the physical characteristics that the surface of a current collector film can be attached to the coating back roller and matched with the shape of the outer surface of the coating back roller, so that the current collector film is molded into the shape of an inverted trapezoid with the middle part low and the two sides high along the axial direction of the coating back roller corresponding to the position of the coating slurry before the coating slurry is coated, when the current collector film is attached to the coating back roller, the section of the coating layer formed by the slurry also presents the shape of the inverted trapezoid along the axial direction of the coating back roller at the beginning, and as the slurry on the two sides of the coating layer is less than the slurry in the middle part at the beginning, the direction of the coating layer along the axial direction A of the coating back roller presents the shape of the middle part thick (namely the middle part high) and the two sides thin (namely the two sides low) after the current collector film is flattened, and finally the effect that the edge of the coating layer of the pole piece is thinned is achieved.

The coated backing roll was used for pole piece preparation. The electrode sheet is a key component inside the battery and is divided into a positive electrode sheet and a negative electrode sheet. The positive electrode plate is used for participating in oxidation reaction in the discharging process, and the negative electrode plate is used for participating in reduction reaction in the charging process. The positive and negative pole pieces can be strip pole pieces. The electrode sheet is composed of a composite material (slurry 400 in the present application) formed by mixing a current collector film (current collector film 500 in the present application) with an active material, a conductive agent, and a binder coated thereon. The composite material is used to form an electrode.

The pole piece preparation system comprises a coating back roller and a coating die head. The coated backing roll is used to carry and transport the current collector film of the pole piece. The coating die is used to apply a paste to the current collector film and generally includes spacers protruding in a direction approaching the coating back roll, a paste outlet is provided between adjacent two spacers, and the paste is output from the paste outlet and applied to the current collector film.

According to some embodiments of the present application, a coated backing roll 100 for pole piece preparation is provided. The coating back roll 100 includes a back roll body 110. The back roll body 110 includes a first die section roll segment 111, a second die section roll segment 112, and a third die section roll segment 113 arranged in the axial direction a. The radial dimension of the third mold section roll segment 113 is greater than the radial dimension of the first mold section roll segment 111. The second die section roller section 112 connects the first die section roller section 111 and the third die section roller section 113, and gradually increases in radial dimension from the first die section roller section 111 to the third die section roller 13.

As shown in fig. 1, the axial direction a in the drawing is the axial direction of the coating back roller 100.

The first and third mold section roll segments 111, 113 are each cylindrical in space. The second mold section roll segment 112 is spatially frustoconical.

The coating back roll 100 may comprise a plurality of first die section roll segments 111, for example 3 first die section roll segments 111 as shown in fig. 1, or the coating back roll 100 may comprise only one first die section roll segment 111.

There may be 1 third die section roll segment 1 between two adjacent first die section roll segments 111. The total length of the coating back roll 100 is not limited and can be designed comprehensively according to the production requirements and the size of the work site.

By setting the radial dimension of the third die section roller section 113 to be larger than the radial dimension of the first die section roller section 111 and setting the radial dimension of the second die section roller section 112 connecting the first die section roller section 111 and the third die section roller section 113 to be gradually increased from the first die section roller section 111 to the third die section roller section 113, a space shape which makes the middle of the coating layer of the coating paste thick and both sides thin can be formed at a position corresponding to the paste coating, and the problem of the thick side effect at the time of paste coating can be effectively avoided. This is advantageous for pole pieces prepared using a slurry coating process.

According to some embodiments of the application, optionally, the coating back roll 100 further comprises an adjusting device. The adjustment device is configured to change a size of at least one of the first, second, and third die section roll segments 111, 112, 113.

It should be appreciated that the adjustment means of the coating back roll 100 may vary the size of at least one of the first, second and third die section roll segments 111, 112, 113, for example, may include varying the width or radial size of at least one of the die section roll segments. For example, the adjustment device may change the radial dimension of the second die section roll segment 112 and simultaneously change the diameter of the third die section roll segment 113 without changing the width. For another example, the adjustment device may change the radial dimension of the second mold section roll segment 112 and simultaneously change the diameter and width of the third mold section roll segment 113. For another example, the adjustment device may only change the width of the second mold section roll segment 112, or the adjustment device may only change the width of the third mold section roll segment 113.

By providing an adjustment means to change the radial dimension or width of at least one of the first, second and third die section roll segments 111, 112, 113, a change in the shape of the outer surface of the coated backing roll 100 can be achieved, thereby effecting an adjustment of the thickness and width of the coating layer or coating layer portion region of the pole piece.

According to some embodiments of the application, optionally, the adjusting means are provided inside said back roller body 110.

With further reference to fig. 2, the second and third mold section roll segments 112, 113 have cavities therein in which the adjustment means are disposed.

The second and third die section roller segments 112 and 113 have cavities therein, and the adjusting device is disposed in the cavities, which is advantageous in preventing the adjusting device from contacting the outside, and preventing moist air or external impurities from entering the coating back roller 100 and damaging the adjusting device. The adjusting process of the adjusting device on at least one of the first mold area roller section 111, the second mold area roller section 112 and the third mold area roller section 113 is completed in the back roller main body 110, and the adjusting process and the pole piece coating process of the adjusting device outside the back roller main body 110 are independent, so that the adjusting process of the adjusting device and the pole piece coating process are not affected.

According to some embodiments of the application, optionally, the adjusting means is in driving connection with at least one of the first, second and third die section roll sections 111, 112, 113. The adjustment means may drive displacement and/or deformation of at least one of the first, second and third die section roll segments 111, 112, 113 relative to the other die section roll segments to change the size of at least one of the first, second and third die section roll segments 111, 112, 113.

The adjusting device is in driving connection with at least one of the first mold area roller section 111, the second mold area roller section 112 and the third mold area roller section 113 so as to change the size of at least one of the first mold area roller section 111, the second mold area roller section 112 and the third mold area roller section 113, thereby being beneficial to realizing the accurate control of pole piece preparation, improving the flexibility and compatibility of pole piece preparation of the coating back roller 100 and reducing the cost of replacing the whole coating back roller 100 due to different production requirements.

In some embodiments, the adjustment device can drive the displacement of the first mold section roll segment 111 relative to the third mold section roll segment 113 and change the width of the third mold section roll segment 113. For example, referring to fig. 1, the coating back roll 100 has a plurality of first pattern roll segments 111, with reference to one of the third pattern roll segments 113, the adjusting device drives the first pattern roll segment 111 located at the left side of the third pattern roll segment 113 to move leftward, simultaneously drives the first pattern roll segment 111 located at the right side of the third pattern roll segment 113 to move rightward, and maintains the second pattern roll segment 112 stationary with respect to the first pattern roll segment 111, at which time the width of the third pattern roll segment 113 increases.

In the present application, the axial direction a corresponds to the left-right direction of fig. 2 and 6, and the "left" and "right" referred to in the following description are identical to the "left" and "right" shown in fig. 2 and 6.

In some embodiments, the adjustment device may change the radial dimensions of the second and third mold section roll segments 112, 113. For example, the adjusting means increases the width and decreases the radial dimension of the second die section roll segment 112 while the diameter of the third die section roll segment 113 decreases, thereby increasing the overall width and thickness of the thinned region of the coating layer formed from the coating paste corresponding to the second die section roll segment 112.

According to some embodiments of the application, optionally, the adjusting means comprises a first adjusting portion and a second adjusting portion. The first adjustment drives the first mold section roll segment 111 in the axial direction a. The second adjustment drives deformation of at least one of the second and third mold section roll segments 112, 113.

The first adjusting part and/or the second adjusting part are/is beneficial to flexibly controlling the sizes of the first die area roller section 111, the second die area roller section 112 and the third die area roller section 113, the width size of the prepared pole piece can be mainly changed by adjusting the movement of the first die area roller section 111 along the axial direction A, and the thickness size of the thinning area of the prepared pole piece can be mainly changed by adjusting the deformation of at least one of the second die area roller section 112 and the third die area roller section 113.

The deformation of the second die section roll segment 112 includes, for example, a decrease in the width of the second die section roll segment 112 and an increase in the diameter near the end face of the third die section roll segment 113 to which it is connected, or a decrease in the width of the second die section roll segment 112 and a decrease in the diameter near the end face of the third die section roll segment 113 to which it is connected. The deformation of the third mold section roll segment includes, for example, a width of the third mold section roll segment 113 becoming larger or smaller and a diameter of the third mold section roll segment 113 changing. The second adjustment may drive the deformation of the second die section roll segment 112, or the deformation of the third die section roll segment 113, or both the second and third die section roll segments 112, 113.

According to some embodiments of the application, optionally, the adjusting means comprises a first adjusting portion. The first adjustment portion includes a screw 1211. Screw 1211 is threadedly coupled to an end face of first mold section roll segment 111. The screw 1211 is configured to be rotatably disposed about the axis of the coating back roller 100 to drive the first die section roller 111 to move by changing the mating position of the screw 1211 with the first die section roller 111.

The first mold area roller section 111 is driven by a screw rod, so that the structure is stable, and the adjustment, the assembly and the disassembly are convenient.

The first driving means M1 may be provided to drive the screw 1211 to rotate. The first driving device M1 is, for example, a stepping motor.

Referring to fig. 2 or 6, when the coating back roll 100 includes two first mold section roll segments 111, one first driving device M1 may be disposed between the two first mold section roll segments 111, and both ends of the first driving device M1 are drivingly connected to one screw 1211, respectively. The first driving means M1 may simultaneously drive the screws 1211 at both ends to rotate to drive the two first mold section roll segments 111 at both sides to simultaneously move in a direction away from the first driving means M1 or to simultaneously move toward a side close to the first driving means M1.

According to some embodiments of the present application, the backing roll body 110 optionally includes a deformable sleeve 114 for forming a surface of the second mold section roll segment 112 and a surface of the third mold section roll segment 113. A deformable sleeve 114 is connected to the first mold section roll section 111. The adjusting device comprises a second adjusting part. The second adjusting portion includes a plurality of support plates 1223 and a support plate position adjusting mechanism. A plurality of support plates 1223 are distributed radially inward of the second die section roll segment 112 along the circumference Xiang Junyun of the coating back roll 100 and integrally form an annular structure supporting the deformable sleeve 114. One end of a plurality of support plates 1223 is attached to the end surface of the first mold section roll section 111 adjacent to the second mold section roll section 112. A support plate position adjustment mechanism is drivingly connected to each support plate 1223 and is configured to vary the spacing of the ends of the plurality of support plates 1223 remote from the first mold section roll segment 111 to deform the deformable sleeve 114 to follow the plurality of support plates 1223.

The support plates 1223 and the support plate position adjusting mechanism are arranged to drive the support plates 1223 so as to change the interval of one ends of the support plates 1223 far away from the first die section roll section 111, the interval is increased, the radial dimension of the second die section roll section 112 is increased, the interval is decreased, the radial dimension of the second die section roll section 112 is decreased, the deformable sleeve 114 synchronously contracts or expands according to the change of the interval of the support plates 1223, the change of the radial dimension of the second die section roll section 112 of the coating back roll 100 can be enabled to have continuity and accuracy, the deformable sleeve 114 plays a supporting role on the current collector film 500, and the flatness of the current collector film 500 when supported on the deformable sleeve 114 can be improved.

The support plate 1223 may be made of a wooden material, a metal material, a high molecular polymer, or the like. The length and thickness of the support plate 1223 may be comprehensively designed according to space size, specifications for manufacturing the pole piece, manufacturing process, cost, and the like. The support plate 1223 may be connected to the first mould section roll section 111 in an articulated manner and the other end forms a free end.

The deformable sleeve 114 may be an organic elastic film that is disposed to fit the outer surface of the support plate 1223 and has a thickness equal to the distance between the outer surface edge of the support plate 1223 where the support plate 1223 joins the first mold section roll section 111 and the outer surface of the first mold section roll section 111.

The deformable sleeve 114 may be made of PTFE, PP, PE, PET, PA or other material that ensures that the surface of the third die section 113 of the coating back roll 100 is smooth and resilient.

A deformable sleeve 114 is disposed between two adjacent first mold section roll sections 111, and two sides of the deformable sleeve 114 may be fixedly connected to the end surfaces of the two first mold section roll sections 111 by adhesion, embedding, or the like. The portion of the deformable sleeve 114 bonded to the support plate 1223 is formed into a circular truncated cone by the supporting force of the support plate 1223 of the adjacent two second mold section roll sections 112 on the deformable sleeve 114 positioned on the support plate 1223, and a cylinder is formed between the support plates 1223 on both sides. The support plate position adjusting mechanism drives the support plate 1223 to rotate about one end thereof connected to the first pattern roll section 111, and the shape of the deformable sleeve 114 changes accordingly, for example, the support plate position adjusting mechanism drives the support plate 1223 to rotate in a direction away from the axis of the back roll main body 110, the interval of one end of the plurality of support plates 1223 away from the first pattern roll section 111 becomes large, the radial dimension of the part shaped into a circular truncated cone becomes large and the height (corresponding to the width of the second pattern roll section 112) of the circular truncated cone becomes small, and the diameter and width of the part shaped into a cylinder (corresponding to the third pattern roll section 113) become large. It should be appreciated that the adjustment means are provided inside the back roller body 110, i.e. inside the deformable sleeve 114.

The size of the second mold area roller section 112 and the third mold area roller section 113 is continuously changed through the rotation of the supporting plate 1223, so that the size of the coating back roller 100 is conveniently changed according to different requirements to prepare pole pieces with different specifications, the deformable sleeve 114 is arranged on the outer side of the supporting plate 1223, and the outer contours of the second mold area roller section 112 and the third mold area roller section 113 are formed through the deformable sleeve 114, so that the deformable sleeve 114 protects the internal structure, the surfaces of the second mold area roller section 112 and the third mold area roller section 113 forming the coating position are smoother, and the preparation of pole pieces is facilitated.

Optionally, according to some embodiments of the application, the support plate position adjustment mechanism comprises a moving member 1221 and a rotating member 1222. The moving member 1221 is movably provided in the axial direction a. The rotating member 1222 is hinged at a first end to the moving member 1221 and at a second end to the support plate 1223. The support plate position adjusting mechanism is configured to change the interval of the ends of the plurality of support plates 1223 remote from the first pattern roll section 111 by rotating the rotating member 1222 through the movement of the moving member 1221.

The second adjusting part comprises a second driving device M2, and the second driving device M2 is in driving connection with the moving member 1221 to drive the moving member 1221 to translate. The second driving device M2 includes, for example, a linear motor.

As shown in fig. 2 or 6, alternatively, one end of the moving member 1221 is connected to the second driving device M2, and the other end extends in the axial direction a toward the first mold section roll section 111, and the end surface of the first mold section roll section 111 is the movement limit position of the moving member 1221. The rotating member 1222 is hinged at one end to a side of the moving member 1221 near the first mold section roll section 111, for example, to an end of the moving member 1221 that can contact the first mold section roll section 111. The other end of the rotary member 1222 is hinged to a side of the support plate 1223 adjacent to the third mold section roll section 113, for example, to an end of the support plate 1223 remote from the first mold section roll section 111. Taking the left moving member 1221 moving to the left in fig. 2 as an example, the moving member 1221 moving to the left drives the rotating member 1222 to rotate in a direction approaching the moving member 1221 with the hinged end of the supporting plate 1223, the supporting plate 1223 is also moved in a direction approaching the moving member 1221 with the end of the supporting plate 1223 far from the first mold section roll section 111 driven by the rotating member 1222, the intervals of the ends of the plurality of supporting plates 1223 far from the first mold section roll section 111 are reduced, the radial dimension of the second mold section roll section 112 is reduced, and the thinned area of the prepared coating layer of the pole piece is thickened.

Referring to fig. 2 or 6, when the coating back roll 100 includes two first mold section roll segments 111, one second driving device M2 may be disposed between the two first mold section roll segments 111, and both ends of the second driving device M2 are respectively driving-connected to one moving member 1221. The second driving means M2 may simultaneously drive the moving members 1221 at both ends to move to simultaneously expand or contract the plurality of support plates 1223 at both sides to simultaneously change the sizes of the second and third mold section roll sections 112 and 113 at both sides.

In some embodiments, the moving member 1221 is optionally a moving sleeve, and the plurality of rotating members 1222 are distributed along a circumferential direction of the moving sleeve to respectively connect the plurality of support plates 1223. The rotation of the rotating member 1222 can be controlled by controlling the movement of the moving member 1221, so that the control manner is beneficial to saving the structural space, the driving of the rotation of the supporting plate 1223 can be realized by the movement of the moving member 1221 for a short distance, the axial space is saved, and the precise control of the supporting plate position adjusting mechanism is also beneficial.

Optionally, the plurality of support plates 1223 form a frustoconical structure without circumferential spacing, according to some embodiments of the application.

Alternatively, when the moving member 1221 moves to the corresponding first mold section roll segment 111 side to the movement limit position abutting against the first mold section roll segment 111, one ends of the plurality of support plates 1223 far away from the first mold section roll segment 111 are attached to each other, and the plurality of support plates 1223 form a circular truncated cone-shaped structure with no interval in the circumferential direction, at this time, the radial dimension of the second mold section roll segment 112 is the smallest.

The circular truncated cone-shaped structure enables the radial dimension of the coating back roller 100 to be uniformly increased from the first die area roller section 111 to the third die area roller section 113, which is beneficial to enabling the outer surface of the second die area roller section 112 to be closer to the circular truncated cone shape and improving the uniformity of slurry coating of the pole piece corresponding to the second die area roller section 122 along the length direction of the pole piece.

According to some embodiments of the application, the backing roll body 110 optionally includes a plurality of first mold section roll segments 111. The second and third mold section roller sections 112 and 113 are provided at both ends of each first mold section roller section 111, respectively.

By providing a plurality of first mold section roll sections 111, a plurality of pole pieces arranged along the axial direction of the coating back roll 100 can be produced at one time to improve the yield and the production efficiency, and the second mold section roll sections 112 and the third mold section roll sections 113 are respectively provided at both ends of the first mold section roll sections 111, both ends of the pole pieces can be simultaneously subjected to thinning treatment, and tab regions for forming tabs of electrodes can be formed at positions corresponding to the third mold section roll sections 113.

Optionally, referring to fig. 1, the back roll body 110 includes 3 first mold section roll segments 111, 6 second mold section roll segments 112, and 4 third mold section roll segments 113 in the axial direction a. Two second and third mold section roller sections 112, 113 are connected to both sides of each first mold section roller section 111. The back roll body 110 has third mold section roll segments 113 at both ends.

One pole piece can be produced corresponding to each first mold section roll segment 111, that is, the coated backing roll 100 shown in fig. 1 can simultaneously produce 3 pole pieces, which is advantageous in terms of productivity, and a tab for forming an electrode can be formed at a position corresponding to the third mold section roll segment 113.

Optionally, according to some embodiments of the present application, a third mold section roller section 113 is included between two adjacent first mold section roller sections 111, and an axial dimension of the third mold section roller section 113 is greater than or equal to a height value of a tab of the double pole piece.

Only one third die section roll segment 113 is provided between two adjacent first die section roll segments 111, and such a design can shorten the axial dimension of the coating back roll 100, and effectively utilize the axial space.

According to some embodiments of the present application, optionally, the outer surface of the junction of the second mold section roll segment 112 and the first mold section roll segment 111 forms a transition radius and/or the outer surface of the junction of the second mold section roll segment 112 and the third mold section roll segment 113 forms a transition radius.

The section size of the joint of each die area roller section is easy to break, a sharp right angle or a sharp corner is formed, the pole piece is easy to scratch to generate broken belts, and the transition round angle is used for replacing the right angle, so that the damage rate of the pole piece is reduced.

Optionally, according to some embodiments of the present application, the coated backing roll 100 further comprises a core rod 130 extending in the axial direction a. Core pin 130 is located within second mold section roll segment 112 and third mold section roll segment 113. The adjustment device is mounted on the core pin 130.

Referring to fig. 2, the core bar 130 is disposed at a radial middle portion of the back roller body 110 along an axis of the back roller body 110. The first adjustment portion of the adjustment device is mounted within the core pin 130. The second adjustment portion is mounted around the stem 130, and the moving member 1222 of the second adjustment portion is slidably engaged with the stem 130 and moves left and right on the stem 130.

The core bar 130 is arranged to support the adjusting device, so that the driving stability and accuracy of the adjusting device can be improved.

According to some embodiments of the application, optionally, the adjusting means comprises a first adjusting portion. The first adjustment drives the first mold section roll segment 111 in an axial direction a relative to the core pin 130. The coating back roll 100 also includes guides. The guide is configured to guide the direction of movement of the first mold section roll segment 111 relative to the core bar 130 and/or to limit rotation of the first mold section roll segment 111 relative to the core bar 130 about its own axis.

Alternatively, the guide may be provided as a sliding fit arrangement, such as a chute and a slide block that mates with the chute, a sleeve and a lever that mates with the sleeve, or the like.

The coating back roll 100 comprises a guiding part, which is beneficial to limiting the moving direction and/or the moving range of the first mold section roll section 111 relative to the second mold section roll section 112 and the third mold section roll section 113 when the first mold section roll section 111 is driven to move, and is beneficial to keeping the integral structure of the coating back roll 100 from being undesirably deformed due to the movement of the first mold section roll section 111.

According to some embodiments of the application, optionally, the guide comprises a first guide structure and a second guide structure. A first guide structure is provided on one of the core pin 130 and the first mold section roll segment 111. A second guide structure is provided on the other of the core pin 130 and the first mold section roll segment 111. The first guide structure is in sliding engagement with the second guide structure along the axial direction a and/or the first guide structure is in engagement with the second guide structure in a rotationally fixed manner along the circumferential direction of the coating back roller 100.

For example, the first guide structure and the second guide structure may be, for example, a guide rod 131 provided along the axial direction a and a guide hole 111A slidably fitted with the guide rod 131, respectively. Referring to fig. 6, a guide hole 111A is provided on the first mold section roll section 111, and a guide rod 131 is provided on the core bar 130.

The first guide structure and the second guide structure of the guide part are respectively arranged on the core bar 130 and the first mold area roller section 111, which is favorable for realizing the guiding and/or limiting function, improving the moving stability of the first mold area roller section 111, and reducing the number of parts for forming the guide part and/or reducing the occupied space of the guide part.

According to some embodiments of the present application, the second aspect of the present application also provides a pole piece preparation system. Referring to fig. 4 and 5, the pole piece preparation system includes a coating back roll 100 and a coating die 300 as described in any of the above schemes. The coated backing roll 100 is used to carry and transfer the current collector film 500 of the pole piece such that the current collector film 500 conforms to the outer surfaces of adjacent first, second and third mold section roll segments 111, 112, 113 of the backing roll body 110 to produce deformation. The coating die 300 is used to coat a slurry 400 for forming a coating layer on the current collector film 500.

The coating die 300 includes a slurry outlet 320 opposite the first and second die section roll segments 111, 112 of the coating back roll 100. The coating die 300 coats the paste 400 for forming a coating layer on the current collector film 500 of the back roll main body 110 through the paste outlet 320 so that the coating die 100 coats the paste 400 having a normal thickness at a position corresponding to the current collector film 500 of the first die section roll section 111, coats the paste 400 having a gradually decreasing thickness at a position corresponding to the current collector film 500 of the second die section roll section 112, and does not coat the paste 400 at a position corresponding to the current collector film 500 of the third die section roll section 113.

The coating die 300 is disposed in parallel with the coating back roller 100. The slurry outlet 320 is elongated and may have a width that is set according to the width of the coating layer of the pole piece. Each slurry outlet 320 is aligned lengthwise with one first modular roll segment 111 and two second modular roll segments 112 connected thereto. A gasket 310 is disposed between two adjacent slurry outlets 320, the gasket 310 being positioned to correspond to the position of the third die section roll segment 113. The pole piece preparation system further includes a transfer roll 600, disposed downstream of the coating back roll 100, the transfer roll 600 being a cylindrical roll for stretching the current collector film 500.

Before the coating die 300 coats the paste 400, the current collector film 500 is firstly transferred onto the coating back roller 100 and is attached to the outer surface of the back roller main body 110, after the alignment of the coating back roller 100 and the coating die 300 is confirmed, the paste 400 flows out of the paste outlet 320 of the coating die 300 and is coated onto the current collector film 500 corresponding to the first die section roller section 111 and the second die section roller section 112, at this time, the section of the paste 400 on the current collector film 500 presents a shape with thick middle and thin two sides, and then the current collector film 500 coated with the paste 400 is transferred onto the driving roller 600 and is stretched, and the paste 400 is deformed along with the current collector film 500, so that the effect of thinning the edge of the pole piece is achieved.

Embodiments of the present application are described in detail below with reference to fig. 1 to 6.

Referring to fig. 1-3, some embodiments of the present application provide a coating back roll 100. The coating back roll 100 includes a back roll body 110 and an adjusting device. The backing roll body 110 includes a first die section roll segment 111, a second die section roll segment 112, and a third die section roll segment 113, and the deformable sleeve 114 coating the backing roll 100 forms the body portions of the first and second die section roll segments 111, 112.

Hereinafter, for convenience of description, positions of the pole piece corresponding to the pole pieces prepared by the first, second and third mold section roll sections 111, 112 and 113 are referred to as a normal mold section, a thinning section and a tab section, respectively.

One or both ends of the deformable sleeve 114 are connected to adjacent first mold section roll segments 111, with the outer surfaces of the deformable sleeve 114 forming the outer surfaces of the second mold section roll segments 112 and the third mold section roll segments 113.

The adjusting device is disposed in the back roller main body 110 and includes a first adjusting portion and a second adjusting portion.

The first adjustment portion includes a first driving device M1 and a screw 1211. The first driving device M1 is a stepping motor, one end of the screw 1211 is connected to the first driving device M1, and the other end is screwed to the end of the first mold section roller section 111. Rotation of the motor control screw 1211 moves the first mold section roll segment 111 in the axial direction a.

The second adjustment portion includes 8 support plates 1223 that may be shaped around a circular table and a support plate adjustment mechanism. The support plate adjusting mechanism includes a second driving device M2, moving members 1221 and 8 support rods as rotating members 1222, which are respectively located at both sides of the second driving device M2. The moving member 1221 is a moving sleeve and is sleeved on the core bar 130, and the second driving device M2 is a linear motor. The plurality of support rods are uniformly distributed on the radial outer side of the movable sleeve along the circumferential direction, one end of each support rod is hinged on the movable sleeve, and the other end of each support rod is hinged on one end, far away from the first mold area roller section 111, of the corresponding support plate 1223. The linear motor drives the moving sleeve to move to one side away from the first mold section roll section 111, so that the angle θ between the support rod and the moving sleeve is increased, one end of the support plate 1223, which is far away from the first mold section roll section 111, moves toward the direction away from the moving sleeve, the gap between one ends of the adjacent support plates 1223, which are far away from the first mold section roll section 111, is enlarged, the radial dimension of the second mold section roll section 112 is increased, and at the same time, the support plate 1223 pulls the deformable sleeve 114 to increase the width of the third mold section roll section 113, so that the thickness of the thinned region is reduced and the width is reduced, and the width of the tab region is increased. If the tab area width is desired to be unchanged, the first adjusting portion may be driven to move the first mold area roller sections 111 at both sides inward.

In other embodiments, referring to fig. 6, the adjustment device further comprises a guide. The guide portion includes a first guide structure and a second guide structure. In this embodiment, the first guide structure is a guide rod 131 disposed on the core rod 130, and the second guide structure is a guide hole 111A disposed on the first mold section roll segment 111. By the sliding fit between the guide bar 131 and the guide hole 111A, the first die section roller segment 111 is moved leftward or rightward in the axial direction a by the drive of the first adjusting portion, and since the guide bar 131 and the guide hole 111A are eccentrically disposed with respect to the axis of the coating back roller 100, the first die section roller segment 111 does not rotate with respect to the core bar 130 due to the torque generated by the screw connection.

According to some embodiments of the present application, referring to fig. 4 and 5, the present application provides a pole piece preparation system comprising the coated backing roll 100 described above.

The pole piece preparation system also includes a coating die 300. Coating die 300 includes a slurry outlet 320 and a shim 310. The coating die 300 coats the paste 400 for forming a coating layer on the current collector film 500 through the paste outlet 320. When coating, the coating die 300 is opposite to the coating back roll 100, and the current collector film 500 is located between the coating die 300 and the coating back roll 100. The slurry 400 flows out of the slurry outlet 320 of the coating die 300 and is supported on the current collector film 500. The thickness of the slurry 400 coated on the surface of the current collector film 500 may also be controlled by controlling the distance between the current collector film 500 and the coating die 300. The pole piece prepared by the coating back roller 100 has the thinning area with the distance from the slurry outlet 320 gradually reduced from the side close to the normal mold area to the side close to the tab area, and the thickness of the formed slurry coating layer gradually reduced, so that the effect of thinning the edge of the pole piece is achieved.

After the coating is completed, the pole piece is stretched on the transfer roller 600 by the action of the tape-feeding traction force, gradually extends in the width direction, and the current collector film 500 becomes flat, thereby obtaining a pole piece with a flat bottom and thick middle and thin sides of the coating layer.

It should be finally understood that the foregoing embodiments are merely for illustrating the technical solutions of the present disclosure and not for limiting the same, and although the present disclosure has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications may be made to the specific embodiments of the present disclosure or equivalents may be substituted for part of the technical features thereof, which are all included in the scope of the technical solutions claimed in the present disclosure.

Claims (16)

1. A coated backing roll for pole piece preparation, comprising:

Back roll body (110), including first mould district roller section (111), second mould district roller section (112) and third mould district roller section (113) that follow axial (a) and arrange, wherein, the radial dimension of third mould district roller section (113) is greater than the radial dimension of first mould district roller section (111), second mould district roller section (112) connect first mould district roller section (111) with third mould district roller section (113), and from first mould district roller section (111) to third mould district roller section (113) radial dimension increases gradually.

2. The coating back roll according to claim 1, further comprising an adjustment device configured to change a size of at least one of the first die section roll segment (111), the second die section roll segment (112), and the third die section roll segment (113).

3. The coating back roll according to claim 2, characterized in that the adjusting means are arranged inside the back roll body (110).

4. A coating back roll according to claim 3, characterized in that the adjusting means are in driving connection with at least one of the first (111), second (112) and third (113) die zone roll sections, configured to drive at least one of the first (111), second (112) and third (113) die zone roll sections to displace and/or deform relative to the other die zone roll sections to change the size of at least one of the first (111), second (112) and third (113) die zone roll sections.

5. A coating back roll according to claim 3, wherein the adjusting means comprises:

a first adjustment portion configured to drive the first mold section roller segment (111) to move along the axial direction (A), and/or

A second adjustment configured to drive deformation of at least one of the second and third die section roller segments (112, 113).

6. The coating back roll according to claim 5, wherein the adjustment means comprises the first adjustment portion comprising a screw (1211), the screw (1211) being in threaded connection with an end face of the first die section roll (111), the screw (1211) being configured to be rotatably arranged about an axis of the coating back roll (100) to drive the first die section roll (111) to move by changing a mating position of the screw (1211) with the first die section roll (111).

7. The coating back roll according to claim 5, wherein,

-The backing roll body (110) comprises a deformable sleeve (114) for forming a surface of the second die section roll segment (112) and a surface of the third die section roll segment (113), the deformable sleeve (114) being connected with the first die section roll segment (111);

The adjusting device includes the second adjusting portion, the second adjusting portion includes:

a plurality of support plates (1223), the plurality of support plates (1223) being uniformly distributed on the radial inner side of the second die section roller section (112) along the circumferential direction of the coating back roller (100) and integrally forming an annular structure supporting the deformable sleeve (114), one end of the plurality of support plates (1223) being connected to the end face of the first die section roller section (111) near the second die section roller section (112), and

A support plate position adjustment mechanism drivingly connected to each of the support plates (1223) and configured to vary the spacing of the ends of the plurality of support plates (1223) remote from the first mold section roll section (111) so that the deformable sleeve (114) follows the plurality of support plates (1223) to deform.

8. The coating back roll of claim 7, wherein the support plate position adjustment mechanism comprises:

A moving member (1221) movably disposed along the axial direction (A);

-a rotating member (1222), a first end of the rotating member (1222) being hinged to the moving member (1221), a second end of the rotating member (1222) being hinged to the support plate (1223), the support plate position adjustment mechanism being configured to change the spacing of the ends of the plurality of support plates (1223) remote from the first mold section roll section (111) by movement of the moving member (1221) driving the rotating member (1222) to rotate.

9. The coating back roll according to claim 7, wherein the plurality of support plates (1223) form a truncated cone-shaped structure when being circumferentially non-spaced.

10. The coating backing roll according to any one of claims 1-9, characterized in that the backing roll body (110) comprises a plurality of the first die section roll segments (111), both ends of each of the first die section roll segments (111) being provided with the second die section roll segment (112) and the third die section roll segment (113), respectively.

11. The coating back roll according to claim 10, characterized in that one third die section roll segment (113) is comprised between two adjacent first die section roll segments (111), and the third die section roll segment (113) is configured to have an axial dimension greater than or equal to twice the height value of the tab of the pole piece.

12. The coated backing roll according to any one of claims 1 to 9, characterized in that,

The outer surface of the junction of the second die section roller section (112) and the first die section roller section (111) forms a transition fillet, and/or

The outer surface of the joint of the second die section roller section (112) and the third die section roller section (113) forms a transition fillet.

13. The coating back roll according to any of claims 2-9, further comprising a core rod (130) extending in the axial direction (a), the core rod (130) being located within the second (112) and third (113) die section roll segments, the adjusting means being mounted on the core rod (130).

14. The coating back roll of claim 13, wherein the coating back roll,

The adjusting device comprises a first adjusting part configured to drive the first mold section roll segment (111) to move relative to the core bar (130) along the axial direction (a);

The coating back roll (100) further comprises a guide configured to guide a direction of movement of the first mold section roll segment (111) relative to the core bar (130) and/or to limit rotation of the first mold section roll segment (111) relative to the core bar (130) about its own axis.

15. The coating back roll of claim 14, wherein the guide comprises:

A first guide structure provided on one of the core bar (130) and the first mold section roller section (111), and

And the second guide structure is arranged on the other of the core bar (130) and the first die section roller section (111), and the first guide structure is in sliding fit with the second guide structure along the axial direction (A), and/or the first guide structure is in non-relative rotation fit with the second guide structure along the circumferential direction of the coating back roller.

16. A pole piece manufacturing system, comprising:

The coated backing roll of any one of claims 1-15 for carrying and transporting a current collector film (500) of a pole piece such that the current collector film (500) conforms to the outer surfaces of adjacent first (111), second (112) and third (113) mold section roll segments of the backing roll body (110) to create deformation, and

A coating die (300) comprising a slurry outlet (320) opposite the first and second die section roll segments (111, 112) of the coating back roll, configured to coat a slurry (400) for forming a coating layer on the current collector film (500) of the back roll body (110) through the slurry outlet (320), such that the coating die coats the slurry (400) having a normal thickness at a position of the current collector film (500) corresponding to the first die section roll segment (111), coats the slurry (400) having a gradually decreasing thickness at a position of the current collector film (500) corresponding to the second die section roll segment (112), and does not coat the slurry (400) at a position of the current collector film (500) corresponding to the third die section roll segment (113).