Step roller and pole piece manufacturing equipment

Abstract

The utility model discloses a step roller and pole piece manufacturing equipment, and belongs to the technical field of battery production equipment. The step roller comprises a step roller body and a step roller sleeve roller, and the step roller body is sleeved with the step roller sleeve roller. Wherein the position of the step roller sleeve roller is adjustable in the axial direction of the step roller main body. The position of the step roller sleeve roller can be adjusted, so that the position of the step roller sleeve roller corresponds to the film coating area of the base material to meet different coating requirements, and the compatibility of the step roller with different coating requirements is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production equipment, and in particular to a step roller and pole piece manufacturing equipment. Background Art

[0002] Coating is an essential process in the production of lithium-ion batteries, and is also a key process that directly affects battery safety, capacity, life and other performance.

[0003] During the coating process of the battery pole piece, the substrate will undergo unwinding, deviation correction, coating and drying processes in the pole piece manufacturing equipment. The circulation of the substrate requires the cooperation of step rollers in production. How to improve the compatibility of step rollers with different coating requirements is an urgent problem to be solved in battery production technology. Utility Model Content

[0004] In view of the above problems, the present application provides a step roller and pole piece manufacturing equipment, which can improve the compatibility of the step roller with different coating requirements.

[0005] In a first aspect, the present application provides a step roller, which comprises a step roller body and a step roller sleeve roller, wherein the step roller sleeve roller is sleeved on the step roller body, wherein the position of the step roller sleeve roller is adjustable in the axial direction of the step roller body.

[0006] In the technical solution of the embodiment of the present application, the position of the step roller sleeve is adjustable in the axial direction of the step roller body. Such a design can adjust the position of the step roller sleeve so that the position of the step roller sleeve corresponds to the coating area of ​​the substrate to adapt to different coating requirements, thereby improving the compatibility of the step roller with different coating requirements.

[0007] In some embodiments, the step roller body is provided with a slide groove extending along its axial direction, and the step roller sleeve is slidably matched with the slide groove. The step roller also includes a locking mechanism, which is used to lock the step roller sleeve to the step roller body. The position adjustment of the step roller sleeve can be achieved by locking or unlocking the locking mechanism, which is convenient and quick, and can also reduce the frequency of replacing the step roller and reduce production costs.

[0008] In some embodiments, the chute runs through the step roller body along the axial direction of the step roller body. Such a design allows the step roller sleeve to slide out of the step roller body along the chute. On the one hand, after the step roller sleeve is worn, the step roller sleeve can be replaced separately without replacing the step roller as a whole, further reducing production costs. On the other hand, different numbers of step roller sleeves can be installed on the chute to adapt to more coating requirements, further improving the compatibility of the step roller with different coating requirements.

[0009] In some embodiments, the step roller sleeve includes a buffer layer and a sleeve, the sleeve is sleeved on the step roller body, and the buffer layer is arranged on the outer surface of the sleeve. With this design, it is only necessary to control the buffer layer to maintain a high precision to basically meet the processing requirements, and there is no need to maintain a high precision for the entire step roller sleeve, which reduces the cost to a certain extent.

[0010] In some embodiments, the locking mechanism includes a locking member and a slider, the slider is slidably matched in the slide groove, and the locking member connects the sleeve and the slider to lock the sleeve and the slider to the step roller body. Such a design can lock and match the step roller body through the sleeve, without directly locking and matching the step roller body through the buffer layer, thereby reducing the risk of deformation of the buffer layer due to assembly stress generated during assembly.

[0011] In some embodiments, the slide groove includes a first groove section and a second groove section, the first groove section and the second groove section are arranged along the radial direction of the step roller body, the first groove section is closer to the central axis of the step roller body than the second groove section, the width of the second groove section is smaller than the width of the first groove section, and the slider is accommodated in the first groove section. The sleeve is provided with a through hole, and the locking member passes through the through hole and the second groove section in sequence and is threadedly connected to the slider. Since the width of the second groove section is smaller than the width of the first groove section, such a design enables the structure of the slide groove itself to realize the self-limitation of the slider in the radial direction of the step roller body, without the need to add an additional limiting mechanism, thereby reducing the difficulty of assembly and the possibility of assembly errors.

[0012] In some embodiments, in the axial direction of the step roller body, at least one end of the sleeve protrudes from the buffer layer, and the through hole is located at the portion of the sleeve protruding from the buffer layer. Such a design reduces the risk of the locking member contacting the buffer layer when the locking member and the slider are engaged, thereby reducing the risk of reduced accuracy of the buffer layer due to deviation during assembly.

[0013] In some embodiments, in the radial direction of the step roller body, the locking member does not extend beyond the outer circumference of the buffer layer. Such a design reduces the risk of damaging the substrate when the step roller conveys the substrate due to the locking member extending beyond the outer circumference of the buffer layer.

[0014] In some embodiments, the locking member is a screw and the sliding block is a nut. Such a design has a low cost.

[0015] In some embodiments, a plurality of slide grooves are provided, and the plurality of slide grooves are arranged at intervals along the circumference of the step roller body. Such a design improves the adjustment accuracy and assembly stability of the step roller sleeve.

[0016] In some embodiments, a plurality of step roller sleeves are provided, and the plurality of step roller sleeves are spaced apart along the axial direction of the step roller body. The gap between two adjacent step roller sleeves can form a concave portion to correspond to the empty foil area of ​​the substrate, and there is no need to process a step portion on the step roller sleeve, so that the step roller can be more flexibly matched with substrates with different coating requirements.

[0017] In a second aspect, the present application provides a pole piece manufacturing device, which includes the step roller in the above embodiment.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of a pole piece manufacturing device according to some embodiments of the present application;

[0021] Figure 2 An axonometric view of a step roller according to some embodiments of the present application;

[0022] Figure 3 This is a schematic structural diagram of a step roller body according to some embodiments of the present application;

[0023] Figure 4 This is a schematic diagram of the structure of the step rollers of some embodiments of the present application;

[0024] Figure 5 A cross-sectional view of a step roller sleeve roller in some embodiments of the present application;

[0025] Figure 6 It is a cross-sectional view of a step roller body according to some other embodiments of the present application;

[0026] Figure 7 It is an axonometric view of step rollers according to some other embodiments of the present application.

[0027] The reference numerals in the specific implementation manner are as follows:

[0028] 100 - pole piece manufacturing equipment; 10 - step roller; 20 - transmission roller; 30 - coating die; 40 - back roller; 50 - drying mechanism; 60 - driving roller; 70 - unfolding roller; 1 - step roller body; 2 - step roller sleeve roller; 11 - slide groove; 111 - first groove section; 112 - second groove section; 12 - main sleeve roller; 13 - connecting shaft; 21 - sleeve; 211 - through hole; 22 - buffer layer; 3 - locking mechanism; 31 - slider; 32 - locking piece. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] In the present application, the battery may include but is not limited to lithium ion secondary batteries, lithium ion primary batteries, lithium sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc. The shape of the battery cell may include but is not limited to a cylinder, a flat body, a rectangular parallelepiped or other shapes, etc. The battery cell may include but is not limited to a cylindrical battery cell, a square battery cell and a soft pack battery cell according to the packaging method.

[0037] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a casing for encapsulating one or more battery cells. The casing can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0038] In a common battery cell structure, the battery cell includes a housing component, an electrode assembly and an electrolyte. The housing component may be an end cap or a shell, and the end cap closes an opening of the shell to define a receiving space for receiving the electrode assembly.

[0039] The electrode assembly is contained in the containing space, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to pass a large current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. In addition, the electrode assembly can be formed in a manner including but not limited to a winding type or a lamination type.

[0040] In the production process of battery cells, the coating process is used to coat the positive active material on the positive current collector and the negative active material on the negative current collector. That is, the prepared paste-like viscous slurry (positive active material or negative active material) is evenly, continuously or intermittently coated on the substrate (positive current collector or negative current collector). The area on the substrate coated with the slurry is generally called the coating area, and the area on the substrate not coated with the slurry is generally called the empty foil area. During coating, the thickness consistency of each coating position must be ensured, and the coating thickness must be controlled within the tolerance range required by the process.

[0041] The coating process of the battery is generally realized by the pole piece manufacturing equipment, which generally includes a traction mechanism for providing traction to the pole piece, a transmission roller for changing the flow direction of the substrate, a coating die head, a back roller for coating in cooperation with the coating die head, and a drying mechanism, etc. Among them, the traction mechanism generally includes a driving roller and a rubber pressure roller cooperating with the driving roller. The driving roller provides the main driving force for the flow of the substrate, and the rubber pressure roller cooperates to "clamp" the substrate so that the substrate is subjected to a relatively stable traction force, so as to maintain the processing accuracy of the above-mentioned mechanisms, such as coating accuracy, etc.

[0042] The development of battery technology must consider multiple design factors at the same time, such as reliability, cycle life, discharge capacity, charge and discharge rate, energy density and other performance parameters. In addition, the compatibility of the rubber roller with different coating requirements must also be considered.

[0043] The rubber pressing roller used in the traction mechanism of the common coating equipment is generally a rubber pressing flat roller or a grooved rubber pressing roller that cooperates with a driving roller to pull the substrate. In order to reduce the defects such as blank wrinkles or concave and convex spots in the empty foil area of ​​the substrate, the roller body of the rubber pressing roller generally has concave and convex parts, the concave parts correspond to the empty foil area, and the convex parts correspond to the coating area. Such a design can make the roller body basically not in contact with the empty foil area, and there will be no friction between the roller body and the empty foil area. In order to reduce the damage to the substrate, the hardness of the rubber pressing roller is generally low. However, after the rubber pressing roller is used for a long time, the diameter of the convex part may be shortened, which will increase the risk of contact between the roller body and the empty foil area. At this time, a new rubber pressing roller is generally replaced to reduce the above risks. In addition, when the coating requirements change, the convex and concave parts of the original roller body cannot correspond to the coating area and empty foil area of ​​the new coating requirements. The original roller body will not be suitable for the new coating requirements, and the rubber pressing roller corresponding to the new coating requirements also needs to be replaced. This means that when the electrode manufacturing equipment processes substrates of different types of products, that is, when the coating requirements change, the frequency of replacing the rubber pressing roller is relatively high, and the production cost is high. In other words, the compatibility of the rubber pressing roller with different coating requirements is low.

[0044] In view of this, the present application provides a step roller, which includes a step roller body and a step roller sleeve roller, and the step roller sleeve roller is sleeved on the step roller body. In the axial direction of the step roller body, the position of the step roller sleeve roller is adjustable. Since the position of the step roller sleeve roller is adjustable in the axial direction of the step roller body. With such a design, the position of the step roller sleeve roller can be adjusted so that the position of the step roller sleeve roller corresponds to the coating area of ​​the substrate to adapt to different coating requirements, thereby improving the compatibility of the step roller with different coating requirements.

[0045] The coating die head and the coating device disclosed in the embodiments of the present application can be used, but not limited to, for coating slurry on a positive electrode current collector or a negative electrode current collector.

[0046] For the convenience of description, the following embodiments are described by taking a pole piece manufacturing device 100 according to an embodiment of the present application as an example.

[0047] Please refer to Figure 1, the pole piece manufacturing equipment 100 may include an unfolding roller 70, a plurality of driving rollers 20, a coating die 30, a back roller 40, a drying mechanism 50, a step roller 10 and a driving roller 60. The unfolding roller 70 is used to unfold the substrate to improve the extension consistency of each part of the pole piece. The coating die 30 and the back roller 40 can apply the slurry to the substrate so that the substrate forms a coating area and an empty foil area. The number of empty foil areas on the substrate can be changed according to different coating requirements. For example, the number of empty foil areas of the substrate can be four or six. The drying mechanism 50 is generally arranged downstream of the coating die 30 and the back roller 40. The drying mechanism 50 can improve the adhesion of the slurry to the substrate and improve the mechanical strength and chemical stability of the pole piece. The mechanism that plays a traction role on the flow of the substrate in the pole piece manufacturing equipment 100 generally includes a step roller 10 and a driving roller 60 provided in cooperation. The driving roller 60 provides traction, and the step roller 10 cooperates with the driving roller 60 to clamp the substrate so that the flow of the substrate is relatively stable. Generally, the step roller 10 has a convex portion and a concave portion. The convex portion contacts the coating area to cooperate with the driving roller 60 to pull the substrate, and the concave portion corresponds to the empty foil area to avoid the coating area.

[0048] According to some embodiments of the present application, referring to Figures 2 to 4 The present application provides a step roller 10, which includes a step roller body 1 and a step roller sleeve 2, wherein the step roller sleeve 2 is sleeved on the step roller body 1. In the axial direction of the step roller body 1, the position of the step roller sleeve 2 is adjustable.

[0049] The step roller sleeve 2 is sleeved on the step roller body 1, which means that the outer peripheral surface of the step roller sleeve 2 is equivalent to the convex part of the step roller 10, and the concave part of the step roller 10 is formed between the outer peripheral surface of the step roller sleeve 2 and the outer peripheral surface of the step roller body 1.

[0050] In some embodiments, the step roller sleeve 2 is detachably mounted on the step roller body 1. When the coating requirements change, the step roller sleeve 2 can be removed and the position of the step roller sleeve 2 relative to the step roller body 1 can be adjusted in the axial direction of the step roller body 1.

[0051] In some embodiments, the step roller cover 2 can also be slidably arranged on the step roller body 1. When the coating demand changes, the step roller cover 2 is slid to the corresponding position relative to the step roller body 1. The sliding of the step roller cover 2 can be driven by a driving member, such as a cylinder. After the step roller cover 2 is pushed to a predetermined position by the cylinder, the cylinder stops moving, and the step roller cover 2 achieves self-positioning. The step roller cover 2 can also be manually pushed to slide, and after sliding, it is locked to the step roller cover 2 body with a detachable fastener.

[0052] When the step roller 10 is working, in some embodiments, the step roller body 1 does not rotate, and the step roller cover roller 2 rotates relative to the step roller body 1. The position adjustment of the step roller cover roller 2 can be achieved by cooperating with a bearing with adjustable position in the axial direction of the step roller body 1. In other embodiments, the step roller body 1 rotates, and the step roller cover roller 2 does not rotate relative to the step roller body 1.

[0053] The step roller body 1 can be integrally formed or split. In the embodiment where the step roller body 1 is split, please refer to Figure 6 The step roller body 1 may include a main roller 12 and two connecting shafts 13. In the axial direction of the main roller 12, the two connecting shafts 13 are respectively inserted at both ends of the main roller 12. The connecting shafts 13 may be connected to the main roller 12 by fasteners or by welding. The step roller 2 is sleeved on the outer circumference of the main roller 12.

[0054] The number of the step roller sleeve rollers 2 can be multiple, and the multiple step roller sleeve rollers 2 are arranged at intervals in the axial direction of the step roller body 1. In other embodiments, some of the step roller sleeve rollers 2 can also be spliced ​​in the axial direction of the step roller body 1.

[0055] The step roller sleeve 2 can be formed in one piece or in parts. In the embodiment where the step roller sleeve 2 is formed in one piece, the step roller sleeve 2 can be formed from a material with relatively low hardness such as rubber. To achieve the adjustable position of the step roller sleeve 2, a flange portion can be processed at the axial end of the rubber step roller 10, a through hole is provided on the flange portion, and the rubber step roller sleeve 2 is fixed to the step roller body 1 through the through hole by a detachable fastener, wherein a plurality of threaded holes cooperating with the fasteners can be provided on the step roller body 1, and the step roller sleeve 2 can also be adjusted and fixed by cooperating with the fasteners through a long strip of limiting grooves.

[0056] Since the position of the step roller cover roller 2 is adjustable in the axial direction of the step roller body 1, such a design can adjust the position of the step roller cover roller 2 so that the position of the step roller cover roller 2 corresponds to the coating area of ​​the substrate to adapt to different coating requirements, thereby improving the compatibility of the step roller 10 with different coating requirements.

[0057] According to some embodiments of the present application, referring to Figures 2 to 4 The step roller body 1 is provided with a slide groove 11 extending along its axial direction, and the step roller sleeve roller 2 is slidably matched in the slide groove 11. The step roller 10 also includes a locking mechanism 3, which is used to lock the step roller sleeve roller 2 to the step roller body 1.

[0058] The cross-sectional profile of the slide groove 11 can be a convex shape, a concave shape, a U shape, a V shape, etc.

[0059] The locking mechanism 3 is used to lock the step roller sleeve 2 to the step roller body 1, which means that the step roller sleeve 2 can be switched between a locked or unlocked state through the locking mechanism 3. In the axial direction of the step roller body 1, in the locked state, the step roller sleeve 2 cannot move relative to the step roller body 1, and in the unlocked state, the step roller sleeve 2 can move relative to the step roller body 1.

[0060] In some embodiments, in the axial direction of the step roller body 1, the chute 11 may not penetrate the step roller body 1. For example, the chute 11 may be arranged in sections on the outer peripheral surface of the step roller body 1, and each section of the chute 11 has a certain adjustment range, so that the step roller body 1 can be adjusted within a certain range, and different coating requirements can also be met.

[0061] The position adjustment of the step roller sleeve roller 2 can be achieved by locking or unlocking the locking mechanism 3, which is convenient and quick. At the same time, the frequency of replacing the step roller 10 can be reduced, thereby reducing production costs.

[0062] According to some embodiments of this application, please refer to Figure 2 and Figure 3 The slide groove 11 penetrates the step roller body 1 along the axial direction of the step roller body 1.

[0063] The chute 11 penetrates the step roller body 1 along the axial direction of the step roller body 1, and the step roller sleeve 2 is slidably matched with the chute 11, which means that the step roller sleeve 2 can slide out of the step roller body 1 along the chute 11, that is, the step roller sleeve 2 is detachably connected to the step roller body 1. In other words, it means that different numbers of step roller sleeves 2 can be installed on the step roller body 1. In turn, the step roller 10 can adapt to more different coating requirements.

[0064] The chute 11 penetrates the step roller body 1 along the axial direction of the step roller body 1. With this design, the step roller sleeve 2 can slide out of the step roller body 1 along the chute 11. On the one hand, after the step roller sleeve 2 is worn, the step roller sleeve 2 can be replaced separately without replacing the step roller 10 as a whole, further reducing the production cost. On the other hand, different numbers of step roller sleeves 2 can be installed on the chute 11 to adapt to more coating requirements, further improving the compatibility of the step roller 10 with different coating requirements.

[0065] According to some embodiments of this application, please refer to Figure 4 - Figure 5 The step roller sleeve 2 includes a buffer layer 22 and a sleeve 21 . The sleeve 21 is sleeved on the step roller body 1 , and the buffer layer 22 is arranged on the outer surface of the sleeve 21 .

[0066] The sleeve 21 is generally used to cooperate with the step roller body 1, and the outer peripheral surface of the buffer layer 22 is in contact with the coating area. This means that the buffer layer 22 can basically meet the design requirements with high precision. In some embodiments, the size of the buffer layer 22 along the axial direction of the step roller body 1 can be specifically designed according to all the coating requirements actually required. For example, the size of the buffer layer 22 along the axial direction of the step roller body 1 can meet the processing of products with the smallest coating area size. In other words, the size of the buffer layer 22 along the axial direction of the step roller body 1 is smaller than the smallest coating area size of all substrates to be processed.

[0067] In some embodiments, the hardness of the sleeve 21 is greater than the hardness of the buffer layer 22. The sleeve 21 may be made of metal, such as steel, etc. The buffer layer 22 may be made of rubber, etc.

[0068] The buffer layer 22 can be directly sprayed onto the outer surface of the sleeve 21 , or the buffer layer 22 can be prefabricated and then bonded to the outer circumferential surface of the sleeve 21 .

[0069] The sleeve 21 can be a whole annular sleeve 21, or can be formed by splicing petals.

[0070] The step roller sleeve 2 includes a buffer layer 22 and a sleeve 21, wherein the sleeve 21 is sleeved on the step roller body 1, and the buffer layer 22 is arranged on the outer surface of the sleeve 21. With such a design, it is only necessary to control the buffer layer 22 to maintain a high precision to basically meet the processing requirements, and it is not necessary to maintain a high precision for the entire step roller sleeve 2, which reduces the cost to a certain extent.

[0071] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The locking mechanism 3 includes a locking member 32 and a slider 31 . The slider 31 is slidably fitted in the slide groove 11 . The locking member 32 connects the sleeve 21 and the slider 31 to lock the sleeve 21 and the slider 31 to the step roller body 1 .

[0072] In some embodiments, the locking member 32 may be a nut, and the slider 31 may be a screw. In the axial direction of the step roller body 1, the edge of the sleeve 21 may be a U-shaped hole, and the opening of the U-shaped hole extends to the edge of the sleeve 21. The screw head of the screw cooperates with the slide groove 11, and after the rod-shaped portion of the screw slides to the inside of the U-shaped hole, the sleeve 21 can be locked to the step roller body 1 by locking the screw with the nut.

[0073] In some embodiments, the locking member 32 is a screw, a plurality of sliders 31 are arranged in the slide groove 11, a plurality of threaded holes are arranged on the sliders 31 at intervals along the axial direction of the step roller body 1, and the screws lock the sleeve 21 and the sliders 31 to the step roller body 1 through the threaded holes. Such a design expands the matching range of the sliders 31 and the locking member 32, and it is not necessary to increase or decrease the sliders 31 synchronously when increasing or decreasing the step roller sleeve 2.

[0074] Since the buffer layer 22 has a low hardness, the locking member 32 itself or the assembly tool may generate assembly stress during the assembly process. When the assembly stress directly acts on the buffer layer 22, the buffer layer 22 may be deformed and the accuracy may be reduced. The locking member 32 acting on the sleeve 21 can reduce the above risk.

[0075] The locking mechanism 3 includes a locking member 32 and a slider 31. The slider 31 is slidably matched with the slide groove 11. The locking member 32 connects the sleeve 21 and the slider 31 to lock the sleeve 21 and the slider 31 to the step roller body 1. Such a design allows the sleeve 21 to be locked with the step roller body 1 without directly locking with the step roller body 1 through the buffer layer 22, thereby reducing the risk of deformation of the buffer layer 22 due to assembly stress generated during assembly.

[0076] According to some embodiments of this application, please refer to Figure 3 - Figure 5 The slide groove 11 includes a first groove section 111 and a second groove section 112, which are arranged along the radial direction of the step roller body 1. The first groove section 111 is closer to the central axis of the step roller body 1 than the second groove section 112. The width of the second groove section 112 is smaller than that of the first groove section 111. The slider 31 is accommodated in the first groove section 111. The sleeve 21 is provided with a through hole 211, and the locking member 32 passes through the through hole 211 and the second groove section 112 in sequence and is threadedly connected to the slider 31.

[0077] The first groove section 111 and the second groove section 112 are arranged along the radial direction of the step roller body 1. The first groove section 111 is closer to the central axis of the step roller body 1 than the second groove section 112. The width of the second groove section 112 is smaller than the width of the first groove section 111, which means that the cross-sectional profile of the slide groove 11 is a "convex" sub-shape. The first groove section 111 can limit the slider 31 in the radial direction of the step roller body 1.

[0078] In the embodiment where the locking member 32 is a screw, the through hole 211 can be a threaded hole that cooperates with the locking member 32, or the through hole 211 can be a light hole, the diameter of which can be larger than the diameter of the screw shaft but smaller than the diameter of the screw head, i.e., the screw crown.

[0079] Since the width of the second groove section 112 is smaller than that of the first groove section 111, this design allows the structure of the slide groove 11 itself to achieve self-limiting of the slider 31 in the radial direction of the step roller body 1 without the need for additional limiting mechanisms, thereby reducing the difficulty of assembly and the possibility of assembly errors.

[0080] The number of through holes 211 can be multiple groups, and the multiple groups of through holes 211 are arranged at intervals along the axial direction of the step roller body 1. Each group of through holes 211 includes multiple through holes 211, and the multiple through holes 211 are arranged at intervals along the circumferential direction of the step roller body 1.

[0081] According to some embodiments of this application, please refer to Figures 3 to 5 In the axial direction of the step roller body 1 , at least one end of the sleeve 21 protrudes from the buffer layer 22 , and the through hole 211 is located at the portion of the sleeve 21 protruding from the buffer layer 22 .

[0082] The through hole 211 is located at the portion of the sleeve 21 protruding from the buffer layer 22 , which means that the risk of scratching the buffer layer 22 when the locking member 32 passes through the through hole 211 is low, and the risk of reducing the accuracy of the buffer layer 22 due to deviations during assembly is low.

[0083] In the axial direction of the step roller body 1, at least one end of the sleeve 21 protrudes from the buffer layer 22, and the through hole 211 is located at the portion of the sleeve 21 protruding from the buffer layer 22. This design reduces the risk of the locking member 32 contacting the buffer layer 22 when it cooperates with the slider 31, thereby reducing the risk of the accuracy of the buffer layer 22 being reduced due to deviations during assembly.

[0084] According to some embodiments of this application, please refer to Figure 3 - Figure 5 In the radial direction of the step roller body 1 , the locking piece 32 does not extend beyond the outer circumferential surface of the buffer layer 22 .

[0085] In the radial direction of the step roller body 1 , the locking piece 32 does not extend beyond the outer peripheral surface of the buffer layer 22 , which means that when the step roller 10 is working, the locking piece 32 will not contact the substrate, thereby not damaging the substrate.

[0086] In some embodiments, the through hole 211 may be a countersunk hole, and at least a portion of the locking member 32 is received in the countersunk hole, thereby reducing the radial dimension of the locking member 32 on the step roller body 1 after assembly.

[0087] In the radial direction of the step roller body 1, the locking member 32 does not extend beyond the outer circumference of the buffer layer 22. Such a design reduces the risk of damaging the substrate when the step roller 10 transports the substrate due to the locking member 32 extending beyond the outer circumference of the buffer layer 22.

[0088] According to some embodiments of this application, please refer to Figure 3 - Figure 5 The locking member 32 is a screw, and the sliding block 31 is a nut. Such a design has a low cost.

[0089] According to some embodiments of this application, please refer to Figure 2 - Figure 4A plurality of slide grooves 11 are provided, and the plurality of slide grooves 11 are arranged at intervals along the circumferential direction of the step roller body 1 .

[0090] In some embodiments, the angles of intervals between every two adjacent slide grooves 11 in the circumferential direction of the step roller body 1 are the same.

[0091] There are multiple chute grooves 11, and the multiple chute grooves 11 are arranged at intervals along the circumference of the step roller body 1. Such a design improves the adjustment accuracy and assembly stability of the step roller sleeve roller 2.

[0092] According to some embodiments of this application, please refer to Figure 2 and Figure 7 There are multiple step roller sleeves 2, and the multiple step roller sleeves 2 are arranged at intervals along the axial direction of the step roller body 1.

[0093] The step roller 10 can be used for coating the positive electrode sheet or the negative electrode sheet. Figure 2 , three-step roller sleeve roller 2 can be adapted to the "one out of six" type of pole piece processing. Please refer to Figure 7 The two step roller sleeve rollers 2 can be adapted to the “one out of four” type of pole piece processing.

[0094] The gap between two adjacent step roller sleeves 2 can form a recessed portion to correspond to the empty foil area of ​​the substrate, without machining a step portion on the step roller sleeve 2, making the step roller 10 more flexible in matching with substrates with different coating requirements.

[0095] According to some embodiments of this application, please refer to Figure 2 - Figure 6The present application provides a step roller 10, which includes a step roller body 1 and a step roller sleeve 2, and the step roller sleeve 2 is sleeved on the step roller body 1. In the axial direction of the step roller body 1, the position of the step roller sleeve 2 is adjustable. The step roller body 1 includes a main sleeve 12 and two connecting shafts 13, and the two connecting shafts 13 are inserted at both ends of the main sleeve 12 in its axial direction and are fixedly connected to the main sleeve 12. The main sleeve 12 is provided with a slide groove 11 extending along its axial direction, and the slide groove 11 penetrates the main sleeve 12 along the axial direction of the main sleeve 12. The step roller 10 also includes a locking mechanism 3, and the locking mechanism 3 is used to lock the step roller sleeve 2 to the main sleeve 12. The step roller sleeve 2 includes a buffer layer 22 and a sleeve 21, and the sleeve 21 is sleeved on the main sleeve 12, and the buffer layer 22 is provided on the outer surface of the sleeve 21. The locking mechanism 3 includes a screw and a nut. The nut is slidably matched in the slide groove 11. The screw connects the sleeve 21 and the nut to lock the sleeve 21 and the nut to the main sleeve roller 12. The slide groove 11 includes a first slot section 111 and a second slot section 112. The first slot section 111 and the second slot section 112 are arranged along the radial direction of the main sleeve roller 12. The first slot section 111 is closer to the central axis of the main sleeve roller 12 than the second slot section 112. The width of the second slot section 112 is smaller than the width of the first slot section 111. The nut is accommodated in the first slot section 111. The sleeve 21 is provided with a through hole 211. The screw passes through the through hole 211 and the second slot section 112 in sequence and is threadedly connected with the nut. In the axial direction of the main sleeve roller 12, at least one end of the sleeve 21 protrudes from the buffer layer 22, and the through hole 211 is located at the portion of the sleeve 21 protruding from the buffer layer 22. In the radial direction of the main sleeve roller 12, the screw does not exceed the outer circumferential surface of the buffer layer 22. There are two chute grooves 11, which are arranged at intervals of 180 degrees along the circumference of the main roller set 12. There are three step roller set rollers 2, which are arranged at intervals along the axial direction of the main roller set 12.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A step roller, characterized in that: include: Step roller body; A step roller sleeve roller, sleeved on the step roller body; Wherein, in the axial direction of the step roller body, the position of the step roller sleeve roller is adjustable; The step roller body is provided with a slide groove extending along its axial direction, and the step roller sleeve roller is slidably matched with the slide groove; The step roller further comprises a locking mechanism, and the locking mechanism is used to lock the step roller sleeve roller to the step roller body; The step roller sleeve comprises a buffer layer and a sleeve, wherein the sleeve is sleeved on the step roller body, and the buffer layer is arranged on the outer surface of the sleeve; The locking mechanism comprises a locking member and a slider, the slider is slidably matched with the slide groove, and the locking member connects the sleeve and the slider to lock the sleeve and the slider to the step roller body; The locking piece is a screw, and a plurality of threaded holes cooperating with the locking piece are arranged at intervals on the sliding block along the axial direction of the step roller body.

2. The step roller according to claim 1, characterized in that: The slide groove penetrates the step roller body along the axial direction of the step roller body.

3. The step roller according to claim 1, characterized in that: The slide groove comprises a first groove section and a second groove section, the first groove section and the second groove section are arranged along the radial direction of the step roller body, the first groove section is closer to the central axis of the step roller body than the second groove section, the width of the second groove section is smaller than the width of the first groove section, and the sliding block is accommodated in the first groove section; The sleeve is provided with a through hole, and the locking member passes through the through hole and the second groove section in sequence and is threadedly connected with the slider.

4. The step roller according to claim 3, characterized in that: In the axial direction of the step roller body, at least one end of the sleeve protrudes from the buffer layer, and the through hole is located at the portion of the sleeve protruding from the buffer layer.

5. The step roller according to claim 1, characterized in that: In the radial direction of the step roller body, the locking piece does not extend beyond the outer circumferential surface of the buffer layer.

6. The step roller according to claim 1, characterized in that: A plurality of the slide grooves are provided, and the plurality of the slide grooves are arranged at intervals along the circumferential direction of the step roller body.

7. The step roller according to any one of claims 1 to 6, characterized in that: The step roller sleeve is provided in plurality, and the step roller sleeves are arranged at intervals along the axial direction of the step roller body.

8. A pole piece manufacturing device, characterized in that: It comprises the step roller as claimed in any one of claims 1 to 7.

Images