Roller pressing system and electrode sheet preparation apparatus

Abstract

A roller pressing system and an electrode sheet preparation apparatus. The roller pressing system (100) comprises a support roller (1) and a plurality of work rollers (2), wherein the support roller (1) comprises a first support roller (11), and the first support roller (11) and the work rollers (2) are rotatably arranged; a roller pressing gap (20) is formed between the peripheral walls of any two work rollers (2) adjacent to each other in a first direction; the peripheral wall of the first work roller (21) and the peripheral wall of the first support roller (11) abut against each other in the first direction, or have a first spacing gap (110) therebetween; the first work roller (21) is the work roller (2) among the plurality of work rollers (2) close to the first support roller (11); and the radius of each work roller (2) is less than the radius of the support roller (1). By means of the roller pressing system, a coating layer formed by means of roller pressing has a uniform thickness and relatively good consistency.

Description

Roller pressing system and electrode sheet preparation equipment

[0001] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on March 19, 2024, with application number 202420543616.2 and entitled “Rolling System and Electrode Sheet Preparation Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to a rolling system and an electrode sheet preparation device. Background Art

[0003] In the preparation process of the electrode sheet, there is a process of applying a coating to a base tape used to manufacture the electrode sheet. When applying the coating to the base tape, the dry coating process has the following advantages over the currently commonly used wet coating process: the dry coating process greatly reduces the use of toxic solvents and is more environmentally friendly. The dry coating process reduces the use of solvents and does not require a long-distance oven to dry the electrode sheet. Compared with the wet coating process, it saves nearly 47% of energy. Therefore, the dry coating process is widely used in the process of applying a coating to the base tape.

[0004] As the primary device for performing the dry coating process in electrode sheet manufacturing equipment, the roller pressing system plays a crucial role in the coating effect of the dry coating process. In related art, the roller pressing system primarily comprises two opposing working rollers with a rolling gap defined between their walls. When a large amount of powdered material is placed in the rolling gap, the powdered material is rolled into a strip-shaped coating layer as the working rollers rotate, which is then applied to the surface of the substrate, thereby achieving the coating process on the substrate.

[0005] However, when rolling the powdered material, the two work rolls are subject to significant reaction forces from the powdered material, which can easily cause them to deform. This deformation results in uneven and inconsistent coating thickness. To avoid this problem, related techniques use work rolls with larger radii. However, while these work rolls offer superior strength and are less prone to deformation, they are unable to produce thin coating layers, failing to meet thickness requirements. Summary of the Invention

[0006] One purpose of the embodiments of the present disclosure is to provide a new technical solution for a rolling system and an electrode sheet preparation device.

[0007] According to a first aspect of the present disclosure, a rolling system is provided, comprising: support rollers, the support rollers comprising a first support roller, the first support roller being rotatably arranged; a plurality of working rollers, the first support roller and each of the plurality of working rollers being arranged in sequence along a first direction, and each of the working rollers being rotatably arranged, a rolling gap being formed between the peripheral walls of two adjacent working rollers along the first direction, the peripheral wall of the first working roller abutting against the peripheral wall of the first support roller along the first direction or having a first interval gap, the first working roller being the working roller close to the first support roller among the plurality of working rollers, and the radius of the working roller being smaller than the radius of the support roller; wherein, when the peripheral wall of the first working roller abuts against the peripheral wall of the first support roller, any of the rolling gaps is used to receive incoming materials so as to roll-press the incoming materials to form a coating layer.

[0008] Optionally, when a first spacing gap is provided between the peripheral wall of the first working roller and the peripheral wall of the first supporting roller, either the rolling gap or the first spacing gap is used to receive the incoming material so as to roll the incoming material to form the coating layer.

[0009] Optionally, the support roller further comprises: a second support roller, the second support roller being rotatably arranged and located on a side of the second working roller away from the first working roller along the first direction, the second working roller being a working roller away from the first support roller among the plurality of working rollers, and a peripheral wall of the second working roller abutting against a peripheral wall of the second support roller along the first direction or having a second gap therebetween;

[0010] Wherein, when the peripheral wall of the second working roller abuts against the peripheral wall of the second supporting roller, any of the rolling gaps is used to receive the incoming material so as to roll the incoming material to form the coating layer.

[0011] Optionally, when the second spacing gap is provided between the peripheral wall of the second working roller and the peripheral wall of the second supporting roller, either the second spacing gap or the rolling gap is used to receive the incoming material so as to roll the incoming material to form the coating layer.

[0012] Optionally, the circumferential wall of the first working roller abuts against the circumferential wall of the first support roller along the first direction, and the circumferential wall of the second working roller abuts against the circumferential wall of the second support roller along the first direction.

[0013] Optionally, the working rolls include the first working roll, the third working roll, the fourth working roll, the fifth working roll, the sixth working roll and the second working roll arranged in sequence along the first direction, the rolling gap between the first working roll and the third working roll is a first rolling gap, the rolling gap between the third working roll and the fourth working roll is a second rolling gap, the rolling gap between the fourth working roll and the fifth working roll is a third rolling gap, the rolling gap between the fifth working roll and the sixth working roll is a fourth rolling gap, and the rolling gap between the sixth working roll and the second working roll is a fifth rolling gap, and any one or more of the first rolling gap, the second rolling gap, the third rolling gap, the fourth rolling gap and the fifth rolling gap are used to receive the incoming material to roll the incoming material to form the coating layer.

[0014] Optionally, the incoming material includes a first incoming material and a second incoming material, the coating layer includes a first coating layer and a second coating layer, the first rolling gap is used to receive the first incoming material and roll-press the first incoming material to form the first coating layer, the third working roller is used to guide the first coating layer to the second rolling gap when rotating, and the fourth working roller is used to guide the first coating layer to the third rolling gap when rotating;

[0015] The fifth rolling gap is used to receive the second incoming material to roll the second incoming material to form the second coating layer, the sixth working roller is used to guide the second coating layer to the fourth rolling gap when rotating, and the fifth working roller is used to guide the first coating layer to the third rolling gap when rotating. The third rolling gap is used for inserting a base belt and the base belt is located between the first coating layer and the second coating layer along the first direction, so that the first coating layer and the second coating layer are respectively coated on the two surfaces of the base belt along the first direction.

[0016] Optionally, the width of the second rolling gap along the first direction is smaller than the width of the first rolling gap along the first direction, and / or the width of the fourth rolling gap along the first direction is smaller than the width of the fifth rolling gap along the first direction.

[0017] Optionally, at least one of the support roll and the plurality of working rolls can be reciprocally adjusted along the first direction.

[0018] Optionally, at least one of the support roll and the plurality of working rolls is a fixed roll.

[0019] Optionally, the rolling system further includes a pressure-boosting mechanism, configured to provide pressure along the first direction to the support roll or at least one of the plurality of working rolls.

[0020] Optionally, the radius of the support roller is d, and d≥100 mm.

[0021] According to a second aspect of the present disclosure, there is provided an electrode sheet preparation device, comprising:

[0022] The roller pressing system described in any one of the above first aspects.

[0023] Optionally, the electrode sheet preparation equipment further includes:

[0024] an unwinding device, the unwinding device being used to unwind a base tape into any of the rolling gaps, the coating layer being used to be coated on the base tape;

[0025] A winding device is located downstream of the rolling system and is used to wind up the base belt coated with the coating layer.

[0026] Optionally, the electrode sheet preparation equipment further includes:

[0027] A thickness measuring device is located downstream of the rolling system and upstream of the winding device, and is used to measure the thickness of the base belt coated with the coating layer.

[0028] Optionally, the electrode sheet preparation equipment further includes:

[0029] A material dropping device is used to carry the incoming material so as to drop the incoming material into any of the rolling gaps.

[0030] Optionally, the electrode sheet preparation equipment further includes:

[0031] The edge trimming and waste suction device is used to cut off the waste edges along the length direction of the coating layer and recover the waste edges in a recovery chamber of the edge trimming and waste suction device.

[0032] One technical effect of the embodiments of the present disclosure is:

[0033] In the present disclosure, since the radius of the working roll is smaller than the radius of the support roll, that is, the radius of the support roll is larger than the radius of the working roll, therefore, when the peripheral wall of the first working roll abuts against the peripheral wall of the first support roll and the rolling gap receives the incoming material, although the mechanical strength of the first working roll is not strong enough, since the radius of the support roll is larger than the radius of the working roll, the first support roll can play a strong supporting role on the first working roll, limit the axial runout of the first working roll, and improve the bending moment resistance of the first working roll, thereby avoiding the deformation of the first working roll to a certain extent, and making the coating layer formed by rolling uniform in thickness and good in consistency.

[0034] In the case where there is a first spacing gap between the peripheral wall of the first working roller and the peripheral wall of the first support roller, and the rolling gap receives the incoming material, when the first working roller is deformed toward the first support roller due to the reaction force from the incoming material, as the first working roller is deformed to abut against the first support roller, the first support roller will indirectly support the first working roller, thereby preventing the first working roller from continuing to deform, and further making the coating layer formed by rolling uniform in thickness and good in consistency to a certain extent.

[0035] It can be seen that by making the radius of the support roller larger than the radius of the working roller, the first support roller and each of the multiple working rollers are arranged in sequence along the first direction. Regardless of whether the peripheral wall of the first working roller abuts against the peripheral wall of the first support roller or has a first spacing gap, the first support roller can directly or indirectly support the first working roller, thereby avoiding or reducing the degree of deformation of the first working roller, and further making the thickness of the coating layer formed by rolling uniform and consistent.

[0036] At the same time, since the radius of the working roll is smaller than the radius of the support roll, when the coating layer is rolled by the working roll, a thinner coating layer can be rolled out, which can meet the thickness requirement.

[0037] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0039] FIG1 is a schematic structural diagram of a first rolling system provided by an embodiment of the present disclosure (the peripheral wall of the first working roll abuts against the peripheral wall of the first support roll along a first direction);

[0040] FIG2 is a schematic structural diagram of a second rolling system provided by an embodiment of the present disclosure (a first gap is formed between the peripheral wall of the first working roll and the peripheral wall of the first support roll along a first direction);

[0041] FIG3 is a schematic structural diagram of the roller pressing system in FIG1 when incoming material is loaded into the roller pressing gap;

[0042] FIG4 is a schematic structural diagram of the rolling system in FIG2 when the rolling gap or the first interval gap carries incoming material;

[0043] FIG5 is a schematic structural diagram of a third rolling system provided by an embodiment of the present disclosure;

[0044] FIG6 is a schematic structural diagram of a fourth rolling system provided by an embodiment of the present disclosure;

[0045] FIG7 is a schematic structural diagram of a fifth rolling system provided by an embodiment of the present disclosure;

[0046] FIG8 is a schematic structural diagram of a sixth rolling system provided by an embodiment of the present disclosure;

[0047] FIG9 is a schematic structural diagram of an electrode sheet preparation device provided in an embodiment of the present disclosure.

[0048] Figure 1: 1-support roller; 11-first support roller; 110-first spacing gap; 12-second support roller; 2-working roller; 20-rolling gap; 201-first rolling gap; 202-second rolling gap; 203-third rolling gap; 204-fourth rolling gap; 205-fifth rolling gap; 21-first working roller; 22-second working roller; 220-second spacing gap; 23-third working roller; 24-fourth working roller; 25-fifth working roller; 26-sixth working roller; 3-boosting mechanism; 4-gap fine-tuning assembly; 100-rolling system; 200-electrode sheet preparation equipment; 300-unwinding device; 400-winding device; 500-thickness measuring device; 600-blanking device; 700-trimming and waste suction device; 800-passing roller; A-coating layer; A1-first coating layer; A2-second coating layer; F1-first direction; J-base tape; L-incoming material; L1-first incoming material; L2-second incoming material. DETAILED DESCRIPTION

[0049] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0051] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0052] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0053] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] In the specification and claims of this disclosure, references to features using the terms "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this disclosure, unless otherwise specified, "plurality" means two or more. Furthermore, in the specification and claims, "and / or" refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0055] In the description of the present disclosure, it should be understood that the 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present disclosure.

[0056] Throughout this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, these terms can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0057] Before explaining the technical solution of the present disclosure, a brief description of the inventive concept of the present disclosure is first given.

[0058] The roller pressing system 100, as the primary device for executing the dry coating process in the electrode sheet preparation apparatus 200, plays a crucial role in the coating effect of the dry coating process. In related art, a roller pressing system primarily comprises two opposing working rollers, each with a rolling gap defined between its walls. When a large amount of powdered material is placed in the rolling gap, the powdered material is rolled into a strip-shaped coating layer as the working rollers rotate, and the coating layer is applied to the surface of the substrate, thereby achieving the coating process on the substrate.

[0059] However, when the two work rollers are rolling the powdered material, the reaction force from the powdered material on the work rollers is extremely large (the linear pressure is greater than 1.5t / cm). Therefore, the work rollers are easily deformed due to the excessive force. The coating layer formed by the deformed work rollers is uneven in thickness and poor in consistency. To avoid this problem, the related art selects work rollers with larger radii to increase the mechanical strength of the work rollers. However, according to the minimum rollable thickness formula: hmin = (1.544-0.244λ-1.3λ2)C0fRK;

[0060] hmin is the minimum rollable thickness; λ is the ratio of the rolling area; C0 is a constant related to the Poisson's ratio and Young's modulus of the roll and the workpiece; f is the friction factor; R is the radius of the work roll; K is the plane deformation resistance;

[0061] It can be seen that the minimum rollable thickness is proportional to the working roller radius R. Therefore, the larger the working roller radius R, the thicker the minimum rollable thickness will be. That is, when a working roller with a larger radius is selected, the working roller will not be able to roll out a thinner coating layer. Based on this, the present disclosure provides a rolling system 100 to solve the above problem.

[0062] The rolling system 100 according to an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0063] 1 and 2 , the rolling system 100 includes: a support roll 1 and a plurality of working rolls 2, wherein the support roll 1 includes a first support roll 11, the first support roll 11 is rotatably arranged, the first support roll 11 and each of the plurality of working rolls 2 are arranged in sequence along a first direction F1 (X-axis direction in FIG1 ), and each of the working rolls 2 is rotatably arranged, a rolling gap 20 is formed between the circumferential walls of two adjacent working rolls 2 along the first direction F1, the circumferential wall of the first working roll 21 abuts against the circumferential wall of the first support roll 11 along the first direction F1 (state in FIG1 ) or has a first spacing gap 110 (state in FIG2 ), the first working roll 21 is the working roll 2 among the plurality of working rolls 2 that is close to the first support roll 11 (the working roll 2 on the left side in FIG1 ), and the radius of the working roll 2 is smaller than the radius of the support roll 1.

[0064] 3 , when the peripheral wall of the first working roller 21 abuts against the peripheral wall of the first support roller 11, any rolling gap 20 is used to receive the incoming material L so as to roll the future material L to form a coating layer A. Referring to FIG4 , when a first spacing gap 110 is provided between the peripheral wall of the first working roller 21 and the peripheral wall of the first support roller 11, any one of the rolling gap 20 and the first spacing gap 110 is used to receive the incoming material L so as to roll the future material L to form a coating layer A.

[0065] In this embodiment, referring to FIG3 , when the circumferential wall of the first working roll 21 abuts the circumferential wall of the first support roll 11 and a rolling gap 20 is formed between the circumferential walls of two adjacent working rolls 2 along the first direction F1, when it is desired to roll-press a coating layer A using the rolling system 100, first, a raw material L can be placed in the rolling gap 20. Then, the working rolls 2 can be rotated. As the working rolls 2 rotate, the raw material L slowly passes through the rolling gap 20. During the process of passing through the rolling gap 20, the raw material L is sandwiched between the circumferential walls of the two adjacent working rolls 2 and is subjected to rolling pressure from the circumferential walls of the two adjacent working rolls 2. Under the rolling pressure from the circumferential walls of the two adjacent working rolls 2, the raw material L is rolled by the circumferential walls of the two adjacent working rolls 2 to form a strip-shaped coating layer A, thereby achieving the purpose of rolling the coating layer A using the rolling system 100.

[0066] Referring to FIG. 4 , when a first spacing gap 110 is provided between the circumferential wall of the first working roll 21 and the circumferential wall of the first support roll 11, and a rolling gap 20 is formed between the circumferential walls of two adjacent working rolls 2 along the first direction F1, when it is desired to prepare the coating layer A by rolling using the rolling system 100, either the rolling gap 20 or the first spacing gap 110 can be configured to receive the incoming material L. Specifically, when the rolling gap 20 receives the incoming material L, the incoming material L will be subjected to rolling pressure from the circumferential walls of the two adjacent working rolls 2; and when the first spacing gap 110 receives the incoming material L, the incoming material L will be subjected to rolling pressure from the circumferential walls of the first working roll 21 and the circumferential walls of the first support roll 11. Thus, the purpose of preparing the coating layer A by rolling using the rolling system 100 can be achieved.

[0067] It can be understood that, since the forces act mutually, when the rolling gap 20 receives the incoming material L, the incoming material L will be subjected to the rolling pressure from the circumferential walls of the two adjacent work rolls 2, while the work rolls 2 will also be subjected to the reaction force from the incoming material L. When the forces acting on the work rolls 2 are relatively large, the work rolls 2 will be deformed, which in turn will cause the coating layer A formed by the deformation of the work rolls to be uneven in thickness and poor in consistency. Similarly, when the first spacing gap 110 receives the incoming material L, the incoming material L will be subjected to the rolling pressure from the circumferential walls of the first work roll 21 and the first support roll 11, while the first work roll 21 and the first support roll 11 will also be subjected to the reaction force from the incoming material L. When the forces acting on the first work roll 21 and the first support roll 11 are relatively large, the first work roll 21 and the first support roll 11 will be deformed, which will similarly cause the coating layer A formed by the deformation of the first work roll 21 and the first support roll 11 to be uneven in thickness and poor in consistency.

[0068] In this embodiment, since the radius of the working roll 2 is smaller than the radius of the support roll 1, that is, the radius of the support roll 1 is larger than the radius of the working roll 2, therefore, when the peripheral wall of the first working roll 21 abuts against the peripheral wall of the first support roll 11 and the rolling gap 20 receives the incoming material, although the mechanical strength of the first working roll 21 is not strong enough, since the radius of the support roll 1 is larger than the radius of the working roll 2, the first support roll 11 can play a strong supporting role on the first working roll 21, limit the axial runout of the first working roll 21, and improve the bending moment resistance of the first working roll 21, thereby avoiding the deformation of the first working roll 21 to a certain extent, and making the coating layer A formed by rolling uniform in thickness and good in consistency.

[0069] When there is a first spacing gap 110 between the peripheral wall of the first working roller 21 and the peripheral wall of the first support roller 11, and the first spacing gap 110 receives the incoming material, although the first working roller 21 and the first support roller 11 will be subjected to the reaction force from the incoming material L, since the radius of the support roller 1 is larger than the radius of the working roller 2, even if the first working roller 21 is deformed, the first support roller 11 is not easily deformed. Therefore, compared with the case where both the first working roller 21 and the first support roller 11 are deformed, the thickness of the coating layer A formed by the joint rolling of the peripheral wall of the first working roller 21 and the peripheral wall of the first support roller 11 can still be relatively uniform and consistent.

[0070] In the case where there is a first spacing gap 110 between the peripheral wall of the first working roller 21 and the peripheral wall of the first support roller 11, and the rolling gap 20 receives the incoming material, when the first working roller 21 is deformed toward the first support roller 11 due to the reaction force from the incoming material L, as the first working roller 21 is deformed to abut against the first support roller 11, the first support roller 11 will indirectly support the first working roller 21, thereby preventing the first working roller 21 from continuing to deform, and further making the coating layer A formed by rolling uniform in thickness and good in consistency to a certain extent.

[0071] It can be seen that by making the radius of the support roller 1 larger than the radius of the working roller 2, the first support roller 11 and each working roller 2 in the multiple working rollers 2 are arranged in sequence along the first direction F1. Regardless of whether the peripheral wall of the first working roller 21 abuts against the peripheral wall of the first support roller 11 or has the first spacing gap 110, regardless of whether the first spacing gap 110 receives the incoming material L or the rolling gap 20 receives the incoming material L, the first support roller 11 can directly or indirectly support the first working roller 21, thereby avoiding or reducing the degree of deformation of the first working roller 21, and further making the coating layer A formed by rolling uniform in thickness and good in consistency.

[0072] At the same time, since the radius of the working roller 2 is smaller than the radius of the support roller 1, when the coating layer A is rolled by the working roller 2, a thinner coating layer A can be rolled out, which can meet the thickness requirement.

[0073] It can be seen that the rolling system 100 provided by the present disclosure can prevent the working roller 2 from being easily deformed, so that the coating layer A formed by rolling has a uniform thickness and good consistency, and can also roll out a thinner coating layer A.

[0074] It should be noted that the above-mentioned material L can be a powdered material or a lumpy material, etc., and this embodiment does not limit the material L. Specifically, the material L can be pure lithium, lithium alloy, lithium battery electrode active material, etc., and this embodiment does not limit the material L.

[0075] In some embodiments, the radius of the support roller 1 is d, d ≥ 100 mm. The inventors have found that when d ≥ 100 mm, the mechanical strength of the support roller 1 can be strong and meet the requirements, and deformation of the support roller 1 can be effectively avoided.

[0076] Specifically, the radius of the support roller 1 can be 100 mm, 150 mm or 200 mm, etc., as long as the radius of the support roller 1 is greater than or equal to 100 mm. This embodiment does not limit the radius of the support roller 1.

[0077] In some embodiments, referring to Figures 5 and 6, the support roller 1 further includes: a second support roller 12, the second support roller 12 is rotatably arranged and is located on the side of the second working roller 22 away from the first working roller 21 along the first direction F1 (the right side of the second working roller 22 in Figure 5), the second working roller 22 is the working roller 2 away from the first support roller 11 among the multiple working rollers 2, and the peripheral wall of the second working roller 22 abuts against the peripheral wall of the second support roller 12 along the first direction F1 (the state in Figure 5) or has a second spacing gap 220 (the state in Figure 6).

[0078] Among them, when the peripheral wall of the second working roller 22 abuts the peripheral wall of the second support roller 12, any rolling gap 20 is used to receive the incoming material L to roll the incoming material L to form a coating layer A. When there is a second spacing gap 220 between the peripheral wall of the second working roller 22 and the peripheral wall of the second support roller 12, any one of the second spacing gap 220 and the rolling gap 20 is used to receive the incoming material L to roll the future material L to form a coating layer A.

[0079] By providing the second support roller 12, the second working roller 22 and the first working roller 21 can be clamped between the second support roller 12 and the first support roller 11 along the first direction F1. Therefore, the second working roller 22 and the first working roller 21 can be better supported, making it less likely for the second working roller 22 and the first working roller 21 to deform, so that the thickness of the coating layer A formed by rolling can be more uniform and more consistent.

[0080] In some embodiments, referring to FIG. 5 , the circumferential wall of the first working roller 21 abuts against the circumferential wall of the first support roller 11 along the first direction F1 and the circumferential wall of the second working roller 22 abuts against the circumferential wall of the second support roller 12 along the first direction F1 .

[0081] By making the peripheral wall of the first working roll 21 abut against the peripheral wall of the first support roll 11 along the first direction F1 and the peripheral wall of the second working roll 22 abut against the peripheral wall of the second support roll 12 along the first direction F1, the first support roll 11 can directly support the first working roll 21 while the second support roll 12 can support the second working roll 22, thereby better avoiding the deformation of the first working roll 21 or the second support roll 12, so that the thickness of the coating layer A formed by rolling can be more uniform and more consistent.

[0082] In some embodiments, referring to FIG7 , the working roll 2 includes a first working roll 21, a third working roll 23, a fourth working roll 24, a fifth working roll 25, a sixth working roll 26 and a second working roll 22 arranged in sequence along the first direction F1. The rolling gap 20 between the first working roll 21 and the third working roll 23 is a first rolling gap 201, the rolling gap 20 between the third working roll 23 and the fourth working roll 24 is a second rolling gap 202, and the rolling gap 20 between the fourth working roll 24 and the fifth working roll 25 is a second rolling gap 203. The rolling gap 20 is the third rolling gap 203, the rolling gap 20 between the fifth working roller 25 and the sixth working roller 26 is the fourth rolling gap 204, and the rolling gap 20 between the sixth working roller 26 and the second working roller 22 is the fifth rolling gap 205. Any one or more of the first rolling gap 201, the second rolling gap 202, the third rolling gap 203, the fourth rolling gap 204 and the fifth rolling gap 205 are used to receive the incoming material L to roll the incoming material L to form a coating layer A.

[0083] Since any one or more of the first rolling gap 201, the second rolling gap 202, the third rolling gap 203, the fourth rolling gap 204 and the fifth rolling gap 205 can be used to receive the incoming material L and can roll the incoming material L to form a coating layer A, therefore, when more than one of the first rolling gap 201, the second rolling gap 202, the third rolling gap 203, the fourth rolling gap 204 and the fifth rolling gap 205 are used to receive the incoming material L, multiple coating layers A can be prepared simultaneously, thereby improving the efficiency of the rolling system 100 in rolling the coating layer A.

[0084] It should be noted that the working rolls 2 include the first working roll 21, the third working roll 23, the fourth working roll 24, the fifth working roll 25, the sixth working roll 26 and the second working roll 22 arranged in sequence along the first direction F1, which is only a possible number of working rolls 2 given in this embodiment. Of course, the working rolls 2 can also include a seventh working roll or an eighth working roll, etc., and this embodiment does not limit the number of working rolls 2.

[0085] In some embodiments, referring to FIG7 , the incoming material L includes a first incoming material L1 and a second incoming material L2, the coating layer A includes a first coating layer A1 and a second coating layer A2, the first rolling gap 201 is used to receive the first incoming material L1 to roll the first incoming material L1 to form the first coating layer A1, the third working roller 23 is used to guide the first coating layer A1 to the second rolling gap 202 during rotation, and the fourth working roller 24 is used to guide the first coating layer A1 to the third rolling gap 203 during rotation.

[0086] The fifth rolling gap 205 is used to receive the second incoming material L2 to roll the second incoming material L2 to form a second coating layer A2. The sixth working roller 26 is used to guide the second coating layer A2 to the fourth rolling gap 204 during rotation. The fifth working roller 25 is used to guide the first coating layer A1 to the third rolling gap 203 during rotation. The third rolling gap 203 is used for inserting the base belt J and the base belt J is located between the first coating layer A1 and the second coating layer A2 along the first direction F1, so that the first coating layer A1 and the second coating layer A2 are respectively coated on the two surfaces of the base belt J along the first direction F1 (X-axis direction in Figure 7).

[0087] Since the first rolling gap 201 is used to receive the first incoming material L1, when the first working roller 21 and the third working roller 23 rotate, the first incoming material L1 can be rolled to form the first coating layer A1. Thereafter, under the rotation of the third working roller 23 and the fourth working roller 24, the first coating layer A1 can be guided to the third rolling gap 203 through the second rolling gap 202.

[0088] Since the fifth rolling gap 205 is used to receive the second incoming material L2, when the sixth working roller 26 and the second working roller 22 rotate, the second incoming material L2 can be rolled to form a second coating layer A2. Afterwards, under the rotation of the sixth working roller 26 and the fifth working roller 25, the second coating layer A2 can be guided to the third rolling gap 203 through the fourth rolling gap 204.

[0089] As can be seen, the first working roller 21, the third working roller 23, the fourth working roller 24, the fifth working roller 25, the sixth working roller 26, and the second working roller 22 cooperate to guide both the first coating layer A1 and the second coating layer A2 into the third rolling nip 203. After both the first coating layer A1 and the second coating layer A2 enter the third rolling nip 203, because the third rolling nip 203 allows the insertion of the base web J and the base web J is positioned between the first coating layer A1 and the second coating layer A2 along the first direction F1, when the fourth working roller 24 and the fifth working roller 25 rotate, they can simultaneously convey the base web J and apply the first coating layer A1 and the second coating layer A2 to both surfaces of the base web J along the first direction F1. As can be seen, the first coating layer A1 and the second coating layer A2 can be applied to both surfaces of the base web J simultaneously, thereby improving the coating efficiency of the rolling system 100.

[0090] The base tape J is made of PET (Polyethylene terephthalate) film, PP (polypropylene) film, copper foil or titanium foil, etc. The base tape J is not limited in this embodiment.

[0091] In some embodiments, referring to FIG. 7 , the width of the second rolling gap 202 along the first direction F1 (the X-axis direction in FIG. 7 ) is smaller than the width of the first rolling gap 201 along the first direction F1 .

[0092] By making the width of the second rolling gap 202 along the first direction F1 smaller than the width of the first rolling gap 201 along the first direction F1, when the first coating layer A1 passes through the second rolling gap 202, the thickness of the first coating layer A1 along the first direction F1 can be thinned by a second rolling. On the one hand, the first coating layer A1 can be rolled to be more solid and smoother, and on the other hand, the thickness of the first coating layer A1 along the first direction F1 can be made thinner.

[0093] Furthermore, in some embodiments, referring to FIG. 7 , the width of the fourth rolling gap 204 along the first direction F1 is smaller than the width of the fifth rolling gap 205 along the first direction F1 .

[0094] By making the width of the fourth rolling gap 204 along the first direction F1 smaller than the width of the fifth rolling gap 205 along the first direction F1, when the second coating layer A2 passes through the fourth rolling gap 204, the thickness of the second coating layer A2 along the first direction F1 can be thinned by a second rolling. On the one hand, the second coating layer A2 can be rolled to be more solid and smoother, and on the other hand, the thickness of the second coating layer A2 along the first direction F1 can be made thinner.

[0095] In some embodiments, referring to FIG. 2 and FIG. 7 , at least one of the backup roll 1 and the plurality of working rolls 2 can be reciprocated along the first direction F1 .

[0096] Since the support roller 1 and at least one of the multiple working rollers 2 can be reciprocated along the first direction F1, the spacing between the support roller 1 and the working roller 2 along the first direction F1 or the spacing between two adjacent working rollers 2 along the first direction F1 can be adjusted by reciprocating the position of the support roller 1 or the working roller 2 along the first direction F1, thereby making the width of the first spacing gap 110 or the rolling gap 20 along the first direction adjustable, so that the rolling system 100 can roll out coating layers A of different thicknesses, which is very flexible.

[0097] Among them, there are many ways to implement the reciprocating adjustment of the support roll 1 and multiple working rolls 2 along the first direction F1. Taking the reciprocating adjustment of the working roll 2 along the first direction F1 as an example, in one possible implementation method, referring to Figure 8, a gap fine-tuning component 4 can be installed at one end of the working roll 2. The gap fine-tuning component 4 may include a screw rod and a screw nut. The screw nut is fixedly arranged. The screw rod is rotatably connected to one end of the working roll 2, is threadedly connected to the screw nut and extends along the first direction F1. In this way, when the screw rod is rotated, the screw rod can push one end of the working roll 2 to swing back and forth along the first direction F1, thereby achieving the purpose of reciprocatingly adjusting the position of the working roll 2 along the first direction F1.

[0098] The implementation of reciprocatingly adjusting the support roller 1 along the first direction F1 is similar to the implementation of reciprocatingly adjusting the working roller 2 along the first direction F1 , and will not be described in detail in this embodiment.

[0099] Of course, the purpose of reciprocatingly adjusting the working roll 2 along the first direction F1 can also be achieved through other methods, which will not be listed here in this embodiment.

[0100] In some embodiments, at least one of the support roll 1 and the plurality of work rolls 2 is a fixed roll. By making at least one of the support roll 1 and the plurality of work rolls 2 a fixed roll, the fixed roll can be used as an adjustment reference, providing a reference for reference when reciprocatingly adjusting the work rolls 2 and the support roll 1 along the first direction F1. This can further improve the adjustment accuracy when reciprocatingly adjusting the support roll 1 and the work rolls 2 along the first direction F1.

[0101] The fixed roller refers to a roller that cannot be reciprocated along the first direction F1 but can still rotate around its own axis, and is not a completely fixed roller that cannot rotate around its own axis.

[0102] In some embodiments, referring to FIG8 , the rolling system 100 further includes a pressure boosting mechanism 3 for providing pressure along a first direction F1 (X-axis direction in FIG8 ) to the support roll 1 or at least one of the plurality of working rolls 2 .

[0103] By providing the boosting mechanism 3 , the roller pressure of the support roller 1 and the working roller 2 along the first direction F1 can be increased, so that the roller pressure of the rolling system 100 is greater, and thus the rolling system 100 can better roll and prepare the coating layer A.

[0104] The pressure-boosting mechanism 3 may be a hydraulic cylinder or any device capable of increasing the roll pressure of the backup roll 1 and the working roll 2 along the first direction F1 . The present embodiment does not limit the pressure-boosting mechanism 3 .

[0105] This embodiment further provides an electrode sheet preparation device 200 . Referring to FIG. 9 , the electrode sheet preparation device 200 includes a roller pressing system 100 .

[0106] Among them, the structure of the rolling system 100 can be the same as the structure of any rolling system 100 in the above embodiments, and can bring the same or similar beneficial effects. For details, please refer to the description of the rolling system 100 in the above embodiments, and this embodiment will not be repeated here.

[0107] In this embodiment, since the coating layer A formed by rolling by the rolling system 100 has a uniform thickness and good consistency, based on this, when the electrode sheet preparation equipment 200 includes the rolling system 100, the coating layer A on the electrode sheet prepared by the electrode sheet preparation equipment 200 can have a uniform thickness and good consistency.

[0108] In some embodiments, referring to FIG9 , the electrode sheet preparation equipment 200 further includes: an unwinding device 300 and a winding device 400 , wherein the unwinding device 300 is used to unwind the base tape J toward the rolling gap 20 or the first spacing gap 110 , and the coating layer A is used to be coated on the base tape J; the winding device 400 is located downstream of the rolling system 100 , and the winding device 400 is used to wind up the base tape J coated with the coating layer A.

[0109] In this embodiment, when preparing the electrode sheet, first, the base tape J can be unwound into the rolling gap 20 by the unwinding device 300. Since the rolling gap 20 has the coating layer A, after the base tape J reaches the rolling gap 20, when the base tape J is transmitted through the rolling gap 20, under the rolling action of the working roller 2, the coating layer A will be coated on the base tape J. After the coating layer A is coated on the base tape J, since the winding device 400 is located downstream of the rolling system 100, the base tape J coated with the coating layer A can be wound up by the winding device 400.

[0110] It can be seen that by providing the unwinding device 300 and the rewinding device 400, automatic unwinding and automatic rewinding can be achieved at the same time, which leads to a higher degree of automation.

[0111] In order to better guide the base belt J so that the base belt J can be conveyed along a preset trajectory, in some embodiments, see Figure 9, the electrode sheet preparation equipment 200 also includes a roller 800, and the base belt J is placed on the roller 800. By setting the roller 800, the roller 800 can guide the base belt J so that the base belt J can be conveyed along a preset trajectory, and by changing the position of the roller 800, the purpose of adjusting the conveying trajectory of the base belt J can also be achieved, which is very flexible.

[0112] In some embodiments, referring to FIG9 , the electrode sheet preparation equipment 200 further includes: a thickness measuring device 500 , which is located downstream of the rolling system 100 and upstream of the winding device 400 , and is used to measure the thickness of the base tape J coated with the coating layer A.

[0113] Since the thickness measuring device 500 can measure the thickness of the base tape J coated with the coating layer A, by setting up the thickness measuring device 500, the thickness of the base tape J coated with the coating layer A can be detected in real time, and then when it is detected that the thickness of the base tape J coated with the coating layer A does not meet the preset requirements, the thickness of the coating layer A or the thickness of the base tape J can be adjusted in time, so that the thickness of the base tape J coated with the coating layer A meets the preset requirements. In this way, the production of unqualified products can be avoided.

[0114] The thickness measuring device 500 may be a thickness sensor, a laser thickness gauge, an ultrasonic thickness gauge, or a CCD (Charge Coupled Device) camera, etc. This embodiment does not limit the thickness measuring device 500.

[0115] In some embodiments, referring to FIG. 9 , the electrode sheet preparation apparatus 200 further includes a blanking device 600 , which is used to carry the incoming material L so as to drop the incoming material L into either the rolling gap 20 or the first spacing gap 110 .

[0116] By setting up the blanking device 600, when it is necessary to provide the incoming material L to either the rolling gap 20 or the first spacing gap 110, the blanking device 600 can promptly scatter the incoming material L into either the rolling gap 20 or the first spacing gap 110, thereby achieving the purpose of providing the incoming material L to either the rolling gap 20 or the first spacing gap 110. The method of providing the incoming material L to either the rolling gap 20 or the first spacing gap 110 is simple, and the structure of the electrode sheet preparation equipment 200 can be simplified.

[0117] The above-mentioned blanking device 600 can be a funnel-shaped structure, and the small mouth end of the blanking device 600 can be facing either the rolling gap 20 or the first interval gap 110, and the large mouth end of the blanking device 600 can be set upward. In this way, under the action of gravity, the incoming material L can be scattered through the small mouth end into either the rolling gap 20 or the first interval gap 110.

[0118] It can be understood that when the rolling system 100 rolls to prepare the coating layer A, the two edges of the coating layer A extending along the length direction may have burrs and be uneven, so that the effect of the coating layer A prepared by rolling is not good. In order to avoid this situation, in some embodiments, see Figure 9, the electrode sheet preparation equipment 200 also includes: a trimming and waste suction device 700, which is used to cut off the waste edges along the length direction of the coating layer A and recover the waste edges in the recovery chamber of the trimming and waste suction device 700. In this way, since the trimming and waste suction device 700 can cut off and recover the two edges of the coating layer A extending along the length direction, the two edges of the coating layer A prepared by rolling can be made smoother along the length direction.

[0119] The above-mentioned waste edges refer to the two edges of the coating layer A extending along the length direction, and the two edges may have burrs and unevenness.

[0120] It should be noted that the above-mentioned edge trimming and waste suction device 700 may include a cutter and a dust suction component. The cutter can cut off the waste edges along the length direction of the coating layer A, and the dust suction component can suck the waste edges into the recovery chamber.

[0121] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A roller pressing system (100), characterized in that: include: A support roller (1), the support roller (1) comprising a first support roller (11), the first support roller (11) being rotatably arranged; A plurality of working rollers (2), wherein the first support roller (11) and each of the plurality of working rollers (2) are arranged in sequence along a first direction (F1), and each of the working rollers (2) is rotatably arranged, a rolling gap (20) is formed between the peripheral walls of two adjacent working rollers (2) along the first direction (F1), the peripheral wall of the first working roller (21) abuts against the peripheral wall of the first support roller (11) along the first direction (F1) or has a first spacing gap (110), the first working roller (21) is the working roller (2) close to the first support roller (11) among the plurality of working rollers (2), and the radius of the working roller (2) is smaller than the radius of the support roller (1); When the peripheral wall of the first working roller (21) abuts against the peripheral wall of the first supporting roller (11), any of the rolling gaps (20) is used to receive the incoming material (L) so as to roll the incoming material (L) to form a coating layer (A).

2. The roller pressing system (100) according to claim 1, characterized in that When there is a first spacing gap (110) between the peripheral wall of the first working roller (21) and the peripheral wall of the first supporting roller (11), either the rolling gap (20) or the first spacing gap (110) is used to receive the incoming material (L) so as to roll the incoming material (L) to form the coating layer (A).

3. The roller pressing system (100) according to claim 1 or 2, characterized in that The support roller (1) further comprises: a second support roller (12), the second support roller (12) being rotatably arranged and being located on a side of the second working roller (22) away from the first working roller (21) along the first direction (F1); the second working roller (22) being a working roller (2) away from the first support roller (11) among the plurality of working rollers (2); a peripheral wall of the second working roller (22) abutting against a peripheral wall of the second support roller (12) along the first direction (F1) or having a second spacing gap (220); When the peripheral wall of the second working roller (22) abuts against the peripheral wall of the second supporting roller (12), any of the rolling gaps (20) is used to receive the incoming material (L) so as to roll the incoming material (L) to form the coating layer (A).

4. The roller pressing system (100) according to any one of claims 1 to 3, characterized in that: When the second spacing gap (220) is provided between the peripheral wall of the second working roller (22) and the peripheral wall of the second supporting roller (12), any one of the second spacing gap (220) and the rolling gap (20) is used to receive the incoming material (L) so as to roll the incoming material (L) to form the coating layer (A).

5. The roller pressing system (100) according to any one of claims 1 to 4, characterized in that: The peripheral wall of the first working roller (21) abuts against the peripheral wall of the first supporting roller (11) along the first direction (F1), and the peripheral wall of the second working roller (22) abuts against the peripheral wall of the second supporting roller (12) along the first direction (F1).

6. The roller pressing system (100) according to any one of claims 1 to 5, characterized in that: The working rollers (2) include the first working roller (21), the third working roller (23), the fourth working roller (24), the fifth working roller (25), the sixth working roller (26) and the second working roller (22) arranged in sequence along the first direction (F1), the rolling gap (20) between the first working roller (21) and the third working roller (23) is a first rolling gap (201), the rolling gap (20) between the third working roller (23) and the fourth working roller (24) is a second rolling gap (202), the rolling gap (20) between the fourth working roller (24) and the fifth working roller (25) is a second rolling gap (203). ) is the third rolling gap (203), the rolling gap (20) between the fifth working roller (25) and the sixth working roller (26) is the fourth rolling gap (204), the rolling gap (20) between the sixth working roller (26) and the second working roller (22) is the fifth rolling gap (205), and any one or more of the first rolling gap (201), the second rolling gap (202), the third rolling gap (203), the fourth rolling gap (204) and the fifth rolling gap (205) are used to receive the incoming material (L) to roll the incoming material (L) to form the coating layer (A).

7. The roller pressing system (100) according to any one of claims 1 to 6, characterized in that: The incoming material (L) includes a first incoming material (L1) and a second incoming material (L2); the coating layer (A) includes a first coating layer (A1) and a second coating layer (A2); the first rolling gap (201) is used to receive the first incoming material (L1) so as to roll the first incoming material (L1) to form the first coating layer (A1); the third working roller (23) is used to guide the first coating layer (A1) to the second rolling gap (202) when rotating; and the fourth working roller (24) is used to guide the first coating layer (A1) to the third rolling gap (203) when rotating; The fifth rolling gap (205) is used to receive the second incoming material (L2) so as to roll the second incoming material (L2) to form the second coating layer (A2); the sixth working roller (26) is used to guide the second coating layer (A2) to the fourth rolling gap (204) when rotating; the fifth working roller (25) is used to guide the first coating layer (A1) to the third rolling gap (203) when rotating; the third rolling gap (203) is used for inserting the base belt (J) and the base belt (J) is located between the first coating layer (A1) and the second coating layer (A2) along the first direction (F1), so that the first coating layer (A1) and the second coating layer (A2) are respectively coated on the two surfaces of the base belt (J) along the first direction (F1).

8. The roller pressing system (100) according to any one of claims 1 to 7, characterized in that: The width of the second rolling gap (202) along the first direction (F1) is smaller than the width of the first rolling gap (201) along the first direction (F1), and / or the width of the fourth rolling gap (204) along the first direction (F1) is smaller than the width of the fifth rolling gap (205) along the first direction (F1).

9. The roller pressing system (100) according to any one of claims 1 to 8, characterized in that: The support roller (1) and at least one of the plurality of working rollers (2) can be reciprocated and adjusted along the first direction (F1).

10. The roller pressing system (100) according to any one of claims 1 to 9, characterized in that: At least one of the support roller (1) and the plurality of working rollers (2) is a fixed roller.

11. The roller pressing system (100) according to any one of claims 1 to 10, characterized in that: The rolling system (100) further comprises a pressure boosting mechanism (3), wherein the pressure boosting mechanism (3) is used to provide pressure along the first direction (F1) to the support roll (1) or at least one of the plurality of working rolls (2).

12. The roller pressing system (100) according to any one of claims 1 to 11, characterized in that: The radius of the support roller (1) is d, and d is ≥ 100 mm.

13. An electrode sheet preparation device (200), characterized in that: include: The roller pressing system (100) according to any one of claims 1 to 12.

14. The electrode sheet preparation device (200) according to claim 13, characterized in that: The electrode sheet preparation device (200) further comprises: An unwinding device (300), the unwinding device (300) is used to unwind a base tape (J) toward any of the rolling gaps (20), and the coating layer (A) is used to be coated on the base tape (J); A winding device (400) is located downstream of the rolling system (100), and the winding device (400) is used to wind up the base belt (J) coated with the coating layer (A).

15. The electrode sheet preparation device (200) according to claim 13 or 14, characterized in that: The electrode sheet preparation device (200) further comprises: A thickness measuring device (500) is located downstream of the rolling system (100) and upstream of the winding device (400), and the thickness measuring device (500) is used to measure the thickness of the base tape (J) coated with the coating layer (A).

16. The electrode sheet preparation device (200) according to any one of claims 13 to 15, characterized in that: The electrode sheet preparation device (200) further comprises: A material dropping device (600) is used to carry the incoming material (L) so as to drop the incoming material (L) into any one of the rolling gaps (20).

17. The electrode sheet preparation device (200) according to any one of claims 13 to 16, characterized in that: The electrode sheet preparation device (200) further comprises: The edge trimming and waste suction device (700) is used to cut off the waste edge along the length direction of the coating layer (A) and recover the waste edge in a recovery chamber of the edge trimming and waste suction device (700).

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