Rolling system and electrode slice preparation equipment

Abstract

The utility model relates to the technical field of electrode plate preparation equipment, in particular to a rolling system and electrode plate preparation equipment. The utility model discloses a rolling system, which comprises support rollers, a first support roller, a second support roller and a plurality of rollers, and is characterized in that the support rollers comprise the first support roller and the second support roller are rotatably arranged; a plurality of working rollers are arranged, each working roller is rotatably arranged, a rolling gap is formed between the peripheral walls of every two adjacent working rollers in the first direction, the peripheral wall of the first working roller abuts against the peripheral wall of the first supporting roller in the first direction or a first interval gap is formed between the peripheral wall of the first working roller and the peripheral wall of the first supporting roller, and a second interval gap is formed between the peripheral wall of the second working roller and the peripheral wall of the second supporting roller. The first working roller is the working roller close to the first supporting roller in the multiple working rollers, and the radius of the working roller is smaller than that of the supporting roller. According to the rolling system provided by the invention, a coating layer formed by rolling can be uniform in thickness and relatively good in consistency, and meanwhile, a relatively thin coating layer can be rolled.

Description

Technical Field

[0001] The present application relates to the technical field of electrode sheet preparation equipment, and in particular to a rolling system and electrode sheet preparation equipment. Background Art

[0002] 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.

[0003] As the main device for performing the dry coating process in the electrode sheet preparation equipment, the roller pressing system plays an important role in the coating effect of the dry coating process. In the related art, the roller pressing system mainly includes two working rollers arranged opposite to each other, and there is a roller pressing gap between the roller walls of the two working rollers. In this way, when more powdery materials are placed in the roller pressing gap, as the working rollers rotate, the powdery materials will be rolled into a strip-shaped coating layer and coated on the surface of the base belt, thereby realizing the process of coating the coating on the base belt.

[0004] However, when the two working rollers are rolling the powdered materials, the reaction force from the powdered materials is very large, so the working rollers are easily deformed due to excessive force, and the coating layer formed by the deformed working rollers is uneven in thickness and poor in consistency. In order to avoid this problem, the related technology selects working rollers with larger radius. However, although working rollers with larger radius have good strength and are not easy to deform, working rollers with larger radius cannot roll out thinner coating layers and cannot meet the thickness requirements. Utility Model Content

[0005] The present application discloses a rolling system and an electrode sheet preparation device, which can form a coating layer with uniform thickness and good consistency by rolling, and can also roll out a coating layer with a thinner thickness.

[0006] In order to achieve the above objectives, in a first aspect, the present application discloses a rolling system, comprising:

[0007] A support roller, wherein the support roller comprises a first support roller, wherein the first support roller is rotatably arranged;

[0008] A plurality of working rollers, wherein the first support roller and each of the plurality of working rollers are sequentially arranged along a first direction, and each of the working rollers is rotatably arranged, a rolling gap is formed between the peripheral walls of two adjacent working rollers along the first direction, the peripheral wall of the first working roller abuts against the peripheral wall of the first support roller along the first direction or has a first spacing gap, the first working roller is a working roller close to the first support roller among the plurality of working rollers, and the radius of the working roller is smaller than the radius of the support roller;

[0009] Wherein, when the peripheral wall of the first working roller abuts against the peripheral wall of the first supporting roller, any of the rolling gaps is used to receive the incoming material so as to roll the incoming material to form a coating layer.

[0010] Optionally, when there is a first spacing gap between the peripheral wall of the first working roller and the peripheral wall of the first supporting roller, any one of the rolling gap and the first spacing gap is used to receive the incoming material to roll the incoming material to form the coating layer.

[0011] Optionally, the support roller further comprises:

[0012] a second support roller, the second support roller being rotatably arranged and being 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 the peripheral wall of the second working roller abutting against the peripheral wall of the second support roller along the first direction or having a second spacing gap therebetween;

[0013] 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.

[0014] 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, any one of the second spacing gap and the rolling gap is used to receive the incoming material so as to roll the incoming material to form the coating layer.

[0015] Optionally, a peripheral wall of the first working roller abuts against a peripheral wall of the first supporting roller along the first direction, and a peripheral wall of the second working roller abuts against a peripheral wall of the second supporting roller along the first direction.

[0016] 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.

[0017] 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 to roll 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;

[0018] 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.

[0019] 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.

[0020] Optionally, at least one of the support roll and the plurality of working rolls can be reciprocatedly adjusted along the first direction.

[0021] Optionally, at least one of the support roll and the plurality of working rolls is a fixed roll.

[0022] Optionally, the rolling system further comprises a pressure boosting mechanism, and the pressure boosting mechanism is used to provide pressure along the first direction to the support roll or at least one of the plurality of working rolls.

[0023] Optionally, the radius of the supporting roller is d, and d≥100 mm.

[0024] In a second aspect, the present application discloses an electrode sheet preparation device, comprising:

[0025] The rolling system described in any one of the above first aspects.

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

[0027] An unwinding device, the unwinding device is used to unwind the base tape to any of the rolling gaps, and the coating layer is used to be coated on the base tape;

[0028] A winding device is located downstream of the rolling system, and is used for winding the base belt coated with the coating layer.

[0029] Optionally, the electrode sheet preparation equipment further comprises:

[0030] 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.

[0031] Optionally, the electrode sheet preparation equipment further includes:

[0032] A material dropping device is used to carry the incoming material so as to drop the incoming material into any of the rolling gaps.

[0033] Optionally, the electrode sheet preparation equipment further includes:

[0034] The edge trimming and waste suction device is used to cut off the waste edge along the length direction of the coating layer and recover the waste edge in a recovery chamber of the edge trimming and waste suction device.

[0035] Compared with the prior art, the beneficial effects of this application are:

[0036] In the present application, 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.

[0037] 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 even in thickness and good in consistency to a certain extent.

[0038] 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. No matter 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 coating layer formed by rolling even in thickness and good in consistency.

[0039] 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 to meet the thickness requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 1 is a schematic structural diagram of a first rolling system provided in an embodiment of the present application (the peripheral wall of the first working roller abuts against the peripheral wall of the first support roller along a first direction);

[0042] Figure 2 1 is a schematic structural diagram of a second rolling system provided in an embodiment of the present application (a peripheral wall of the first working roller and a peripheral wall of the first supporting roller have a first spacing gap along a first direction);

[0043] Figure 3 yes Figure 1 A schematic diagram of the structure of the roller pressing system when the roller pressing gap carries incoming materials;

[0044] Figure 4 yes Figure 2 A schematic diagram of the structure of the roller pressing system when the roller pressing gap or the first spacing gap carries incoming materials;

[0045] Figure 5is a structural schematic diagram of a third rolling system provided in an embodiment of the present application;

[0046] Figure 6 is a structural schematic diagram of a fourth rolling system provided in an embodiment of the present application;

[0047] Figure 7 is a structural schematic diagram of a fifth rolling system provided in an embodiment of the present application;

[0048] Figure 8 is a structural schematic diagram of a sixth rolling system provided in an embodiment of the present application;

[0049] Fig. 9 It is a structural schematic diagram of an electrode sheet preparation device provided in an embodiment of the present application.

[0050] Description of main reference numerals

[0051] 1-support roller; 11-first support roller; 110-first spacing gap; 12-second support roller;

[0052] 2-working roller; 20-roller gap; 201-first roller gap; 202-second roller gap; 203-third roller gap; 204-fourth roller gap; 205-fifth roller gap; 21-first working roller; 22-second working roller; 220-second interval 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;

[0053] 100-rolling system; 200-electrode sheet preparation equipment; 300-unwinding device; 400-winding device; 500-thickness measuring device; 600-feeding device; 700-trimming waste suction device; 800-roller;

[0054] 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

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0057] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0058] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0060] Before explaining the technical solution of the present application, a brief description of the inventive concept of the present application is first given.

[0061] The roller pressing system 100 is the main device for performing the dry coating process in the electrode sheet preparation equipment 200, and plays an important role in the coating effect of the dry coating process. In the related art, the roller pressing system mainly includes two working rollers arranged opposite to each other, and there is a roller pressing gap between the roller walls of the two working rollers. In this way, when more powdery materials are placed in the roller pressing gap, as the working rollers rotate, the powdery materials will be rolled into a strip-shaped coating layer and coated on the surface of the base belt, thereby realizing the process of coating the coating on the base belt.

[0062] However, when the two working rollers are rolling the powdered materials, the reaction force from the powdered materials on the working rollers is very large (the line pressure is greater than 1.5t / cm). Therefore, the working rollers are easily deformed due to excessive force, and the coating layer formed by the deformed working rollers is uneven in thickness and poor in consistency. In order to avoid this problem, the relevant technology selects working rollers with larger radius to increase the mechanical strength of the working rollers. However, according to the minimum rollable thickness formula:

[0063] h min =(1.544-0.244λ-1.3λ2)C0fRK;

[0064] h min 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 working roll; K is the plane deformation resistance;

[0065] 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 application provides a rolling system 100 to solve the above problem.

[0066] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0067] See also Figure 1 and Figure 2 The rolling system 100 includes: a support roller 1 and a plurality of working rollers 2, wherein the support roller 1 includes a first support roller 11, the first support roller 11 is rotatably arranged, and the first support roller 11 and each of the plurality of working rollers 2 are arranged along a first direction F1 ( Figure 1 The first working roll 21 and the first supporting roll 11 are arranged in sequence along the first direction F1, and each working roll 2 is rotatably arranged. A rolling gap 20 is formed between the peripheral walls of two adjacent working rolls 2 along the first direction F1. The peripheral wall of the first working roll 21 abuts against the peripheral wall of the first supporting roll 11 along the first direction F1 ( Figure 1 state) or having a first spacing gap 110 ( Figure 2 The first working roll 21 is a working roll 2 (close to the first support roll 11) among the plurality of working rolls 2. Figure 1 The working roll 2 on the left side in the middle), the radius of the working roll 2 is smaller than the radius of the support roll 1.

[0068] Among them, see Figure 3 When the peripheral wall of the first working roller 21 abuts against the peripheral wall of the first supporting roller 11, any rolling gap 20 is used to receive the incoming material L to roll the incoming material L to form a coating layer A, see Figure 4When 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 to roll the incoming material L to form a coating layer A.

[0069] In this embodiment, see Figure 3 In the case where the peripheral wall of the first working roll 21 abuts against the peripheral wall of the first supporting roll 11 and a rolling gap 20 is formed between the peripheral walls of the two adjacent working rolls 2 along the first direction F1, when it is necessary to prepare the coating layer A by rolling through the rolling system 100, first, the incoming material L can be placed in the rolling gap 20, and then the working roll 2 can be rotated. When the working roll 2 rotates, the incoming material L will slowly pass through the rolling gap 20 with the rotation of the working roll 2. In the process of the incoming material L passing through the rolling gap 20, since the incoming material L will be clamped between the peripheral walls of the two adjacent working rolls 2, the incoming material L will be subjected to the rolling pressure from the peripheral walls of the two adjacent working rolls 2. In the case where the incoming material L is subjected to the rolling pressure from the peripheral walls of the two adjacent working rolls 2, the incoming material L will be rolled by the peripheral walls of the two adjacent working rolls 2 to form a strip-shaped coating layer A, thereby achieving the purpose of preparing the coating layer A by rolling through the rolling system 100.

[0070] See also Figure 4 In the case where there is a first spacing gap 110 between the peripheral wall of the first working roll 21 and the peripheral wall of the first support roll 11, and a rolling gap 20 is formed between the peripheral walls of the two adjacent working rolls 2 along the first direction F1, when it is necessary to prepare the coating layer A by rolling through the rolling system 100, either the rolling gap 20 or the first spacing gap 110 can receive the incoming material L. Specifically, when the rolling gap 20 receives the incoming material L, the incoming material L will be subjected to the rolling pressure from the peripheral 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 the rolling pressure from the peripheral walls of the first working roll 21 and the peripheral walls of the first support roll 11, and the purpose of preparing the coating layer A by rolling through the rolling system 100 can also be achieved.

[0071] Among them, it can be understood that, since the force is mutual, when the rolling gap 20 receives the incoming material L, the incoming material L will be subjected to the rolling pressure from the peripheral walls of the two adjacent working rollers 2, and the working roller 2 will also be subjected to the reaction force from the incoming material L. When the force on the working roller 2 is large, the working roller 2 will be deformed, and then the thickness of the coating layer A formed by the deformed working roller is uneven and the consistency is poor. Similarly, when the first interval gap 110 receives the incoming material L, the incoming material L will be subjected to the rolling pressure from the peripheral walls of the first working roller 21 and the first support roller 11, and the first working roller 21 and the first support roller 11 will also be subjected to the reaction force from the incoming material L. When the force on the first working roller 21 and the first support roller 11 is large, the first working roller 21 and the first support roller 11 will be deformed, and the thickness of the coating layer A formed by the deformed first working roller 21 and the first support roller 11 will also be uneven and the consistency is poor.

[0072] 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.

[0073] 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 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 rolling the peripheral wall of the first working roller 21 and the peripheral wall of the first support roller 11 together can still be relatively uniform and have good consistency.

[0074] 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.

[0075] 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 of the multiple working rollers 2 are arranged in sequence along the first direction F1, no matter 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, no matter 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.

[0076] At the same time, since the radius of the working roll 2 is smaller than the radius of the support roll 1, when the coating layer A is rolled by the working roll 2, a thinner coating layer A can be rolled out, which can meet the thickness requirement.

[0077] It can be seen that the rolling system 100 provided in the present application can make the working roller 2 less likely to deform, so that the coating layer A formed by rolling has uniform thickness and good consistency, and can also roll out a thinner coating layer A.

[0078] It should be noted that the above-mentioned material L can be a powdery material or a lump 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.

[0079] 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 well avoided.

[0080] Specifically, the radius of the support roller 1 may be 100 mm, 150 mm or 200 mm, etc. It only needs to be greater than or equal to 100 mm. The radius of the support roller 1 is not limited in this embodiment.

[0081] In some embodiments, see Figure 5 and Figure 6The support roller 1 further includes: a second support roller 12, which is rotatably arranged and is located on a side of the second working roller 22 away from the first working roller 21 along the first direction F1 ( Figure 5 The second working roll 22 is a working roll 2 far away from the first support roll 11 among the plurality of working rolls 2, and the peripheral wall of the second working roll 22 abuts against the peripheral wall of the second support roll 12 along the first direction F1 ( Figure 5 state) or having a second spacing gap 220 ( Figure 6 medium state).

[0082] Among them, when the peripheral wall of the second working roller 22 abuts against the peripheral wall of the second supporting 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 supporting 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 incoming material L to form a coating layer A.

[0083] 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, so that 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 be deformed, so that the coating layer A formed by rolling can be more uniform in thickness and better in consistency.

[0084] In some embodiments, see Figure 5 The peripheral wall of the first working roll 21 abuts 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 abuts against the peripheral wall of the second support roll 12 along the first direction F1.

[0085] By making the peripheral wall of the first working roller 21 abut against the peripheral wall of the first support roller 11 along the first direction F1 and the peripheral wall of the second working roller 22 abut against the peripheral wall of the second support roller 12 along the first direction F1, the first support roller 11 can directly support the first working roller 21 while the second support roller 12 can support the second working roller 22, thereby better avoiding the deformation of the first working roller 21 or the second support roller 12, so that the thickness of the coating layer A formed by rolling can be more uniform and the consistency can be better.

[0086] In some embodiments, see Figure 7The 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 which are 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. The rolling gap 20 between the fourth working roll 24 and the fifth working roll 25 is a second rolling gap 203. 0 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 a coating layer A.

[0087] 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.

[0088] 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 the seventh working roll or the eighth working roll, etc. The number of working rolls 2 is not limited in this embodiment.

[0089] In some embodiments, see Figure 7 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 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.

[0090] 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 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 base belt J along the first direction F1 ( Figure 7 On two surfaces (in the X-axis direction).

[0091] 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.

[0092] 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.

[0093] It can be seen that the first coating layer A1 and the second coating layer A2 can be guided to the third rolling gap 203 under the cooperation of 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. After the first coating layer A1 and the second coating layer A2 enter the third rolling gap 203, since the third rolling gap 203 can be inserted into 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, when the fourth working roller 24 and the fifth working roller 25 rotate, the first coating layer A1 and the second coating layer A2 can be coated on the two surfaces of the base belt J along the first direction F1 while the base belt J is being conveyed. It can be seen that the first coating layer A1 and the second coating layer A2 can be coated on the two surfaces of the base belt J at one time, so the coating efficiency of the rolling system 100 can be made higher.

[0094] The base band J is PET (Polyethylene terephthalate) film, PP (polypropylene) film, copper foil or titanium foil, etc. The base band J is not limited in this embodiment.

[0095] In some embodiments, see Figure 7 The second rolling gap 202 is along the first direction F1 ( Figure 7 The width of the first rolling gap 201 along the first direction F1 is smaller than the width of the first rolling gap 201 along the first direction F1.

[0096] 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.

[0097] Further, in some embodiments, see Figure 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.

[0098] 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 secondary rolling process. 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.

[0099] In some embodiments, see Figure 2 and Figure 7 , at least one of the support roll 1 and the plurality of working rolls 2 can be reciprocatedly adjusted along the first direction F1.

[0100] 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.

[0101] There are many ways to implement the reciprocating adjustment of the support roll 1 and the plurality of 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 of the possible implementations, see Figure 8A gap fine-tuning assembly 4 can be installed at one end of the working roll 2. The gap fine-tuning assembly 4 can include a screw and a screw nut. The screw nut is fixedly arranged. The screw 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 is rotated, the screw 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.

[0102] The implementation method of reciprocatingly adjusting the support roller 1 along the first direction F1 is similar to the implementation method of reciprocatingly adjusting the working roller 2 along the first direction F1, and will not be described in detail in this embodiment.

[0103] Of course, the purpose of reciprocatingly adjusting the working roll 2 along the first direction F1 can also be achieved by other methods, which will not be listed one by one in this embodiment.

[0104] In some embodiments, at least one of the support roll 1 and the plurality of working rolls 2 is a fixed roll. By making at least one of the support roll 1 and the plurality of working rolls 2 a fixed roll, the fixed roll can be used as an adjustment reference, so that when the working roll 2 and the support roll 1 are reciprocated along the first direction F1, there is a reference for reference, and thus when the support roll 1 and the working roll 2 are reciprocated along the first direction F1, the adjustment accuracy can be higher.

[0105] 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.

[0106] In some embodiments, see Figure 8 The rolling system 100 further includes a pressure boosting mechanism 3, which is used to provide a pressure boosting mechanism 3 to the support roll 1 or at least one of the plurality of working rolls 2 along a first direction F1 ( Figure 8 The pressure in the X-axis direction.

[0107] 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 the rolling system 100 can prepare the coating layer A by rolling better.

[0108] 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 .

[0109] This embodiment also provides an electrode sheet preparation device 200, see Fig. 9 , the electrode sheet preparation equipment 200 includes a rolling system 100 .

[0110] 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.

[0111] 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.

[0112] In some embodiments, see Fig. 9 The electrode sheet preparation equipment 200 also includes: an unwinding device 300 and a rewinding device 400, wherein the unwinding device 300 is used to unwind the base tape J to 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 rewinding device 400 is located downstream of the rolling system 100, and the rewinding device 400 is used to rewind the base tape J coated with the coating layer A.

[0113] 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.

[0114] 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, and the degree of automation is higher.

[0115] In order to better guide the baseband J so that the baseband J can be transmitted along a preset trajectory, in some embodiments, see Fig. 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 transmitted according to a preset trajectory, and the transmission trajectory of the base belt J can be adjusted by changing the position of the roller 800, which is very flexible.

[0116] In some embodiments, see Fig. 9 The electrode sheet preparation equipment 200 also 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.

[0117] Since the thickness measuring device 500 can measure the thickness of the base band J coated with the coating layer A, by setting up the thickness measuring device 500, the thickness of the base band 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 band 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 band J can be adjusted in time, so that the thickness of the base band J coated with the coating layer A meets the preset requirements. In this way, the production of unqualified products can be avoided.

[0118] The thickness measuring device 500 may be a thickness measuring sensor, a laser thickness gauge, an ultrasonic thickness gauge, or a CCD (Charge Coupled Device) camera, etc. The present embodiment does not limit the thickness measuring device 500.

[0119] In some embodiments, participating Fig. 9 The electrode sheet preparation equipment 200 further includes: a material dropping device 600 , which is used to carry the incoming material L so as to drop the incoming material L into any one of the rolling gap 20 and the first spacing gap 110 .

[0120] By setting up the blanking device 600, when it is necessary to provide the incoming material L to any one of the rolling gap 20 and the first spacing gap 110, the blanking device 600 can promptly scatter the incoming material L into any one of the rolling gap 20 and the first spacing gap 110, thereby achieving the purpose of providing the incoming material L to any one of the rolling gap 20 and the first spacing gap 110. The method of providing the incoming material L to any one of the rolling gap 20 and the first spacing gap 110 is simple, and the structure of the electrode sheet preparation equipment 200 can be simplified.

[0121] 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 any one of the rolling gap 20 and the first spacing 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 any one of the rolling gap 20 and the first spacing gap 110.

[0122] It can be understood that when the rolling system 100 rolls to prepare the coating layer A, burrs and unevenness may appear on the two edges of the coating layer A extending along the length direction, making the effect of the coating layer A prepared by rolling poor. In order to avoid this situation, in some embodiments, see Fig. 9The 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 extending along the length direction of the coating layer A, the two edges extending along the length direction of the coating layer A prepared by rolling can be made smoother.

[0123] 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.

[0124] 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 suction the waste edges into a recovery chamber.

[0125] 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 it. 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 with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rolling 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 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 a 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), 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 incoming material (L) to form the coating layer (A).

3. The roller pressing system (100) according to claim 1, 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 along the first direction (F1) on a side of the second working roller (22) away from the first working roller (21), the second working roller (22) being a working roller (2) away from the first support roller (11) among the plurality of working rollers (2), the peripheral wall of the second working roller (22) being in contact with the 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 claim 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 claim 3, 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 claim 5, characterized in 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) which are 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); the rolling gap (20) between the fourth working roll (24) and the fifth working roll (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) so as to roll the incoming material (L) to form the coating layer (A).

7. The roller pressing system (100) according to claim 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 as to coat the first coating layer (A1) and the second coating layer (A2) respectively on the two surfaces of the base belt (J) along the first direction (F1).

8. The roller pressing system (100) according to claim 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 roll (1) and at least one of the plurality of working rolls (2) can be reciprocatedly adjusted along the first direction (F1).

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

11. The roller pressing system (100) according to any one of claims 1 to 8, 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 8, characterized in that: The radius of the support roller (1) is d, and d≥100 mm.

13. An electrode sheet preparation device (200), characterized in that: include: The rolling 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) being used to unwind a base tape (J) toward any of the rolling gaps (20), the coating layer (A) being used to be coated on the base tape (J); A winding device (400), the 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 14, characterized in that: The electrode sheet preparation device (200) further comprises: A thickness measuring device (500), the 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 belt (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), wherein the material dropping device (600) is used to carry the incoming material (L) so as to drop the incoming material (L) into any of the rolling gaps (20).

17. 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: 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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