Rewinding and unwinding equipment and battery production line

Abstract

The embodiment of the present application provides a winding and unwinding device and a battery production line. The winding and unwinding device is used for winding or unwinding a material strip, and the winding and unwinding device includes a first reel and a second reel, the first reel having an inner cavity; the second reel is arranged in the inner cavity of the first reel, a diaphragm is wound on the second reel, and one end of the diaphragm is fixed to the second reel; wherein, along the radial direction of the first reel, the first reel has a relative outer circumference and inner circumference, and the first reel is provided with a groove that penetrates the inner circumference and outer circumference of the first reel, and the groove is used for the other end of the diaphragm to pass through and connect with the starting end of the material strip. The technical solution provided by the present application will not leave glue on the surface of the first reel, and has a good fixing effect on the material strip.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a winding and unwinding device and a battery production line. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the battery manufacturing process, the electrode is one of the important components. During the winding or unwinding process, the starting end of the electrode is generally adhered to the reel of the winding and unwinding equipment with tape, which may easily lead to problems such as glue remaining on the surface of the reel or the electrode being not firmly fixed. Utility Model Content

[0004] The present application provides a winding and unwinding device and a battery production line, which will not leave glue on the surface of the first reel and has a good fixing effect on the material strip.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, an embodiment of the present application provides a winding and unwinding device, which is used for winding or unwinding a material strip, and the winding and unwinding device includes a first reel and a second reel, the first reel having an inner cavity; the second reel is arranged in the inner cavity of the first reel, and a diaphragm is wound on the second reel, and one end of the diaphragm is fixed to the second reel; wherein, along the radial direction of the first reel, the first reel has a relative outer circumferential surface and an inner circumferential surface, and the first reel is provided with a groove that passes through the inner circumferential surface and the outer circumferential surface of the first reel, and the groove is used for the other end of the diaphragm to pass through so as to be connected with the starting end of the material strip.

[0007] In the technical solution of the embodiment of the present application, the material strip can be a pole piece material strip for battery manufacturing. A groove is opened on the first reel, and the groove runs through the inner circumference and outer circumference of the first reel. A second reel is provided in the inner cavity of the first reel, and a diaphragm is wound on the second reel. In this way, one end of the diaphragm on the second reel can pass through the groove and extend out of the first reel to be connected with the starting end of the material strip. Compared with the starting end of the material strip being fixed to the outer circumference of the first reel by conventional gluing, the method of extending the diaphragm on the second reel through the groove and connecting with the material strip does not need to consider the amount of glue used. It is only necessary to make the diaphragm and the starting end of the material strip firmly connected. The fixing effect of the material strip is good, and there will be no glue left on the outer circumference of the first reel or the material strip will not be firmly fixed.

[0008] According to some embodiments of the present application, the groove has a first opening end on the inner circumferential surface and a second opening end on the outer circumferential surface, and the first opening end and the second opening end are staggered in the circumferential direction of the first reel.

[0009] In the above scheme, by staggering the first open end and the second open end of the groove in the circumferential direction of the first roll, it is convenient for the diaphragm to extend out of the outer circumferential surface of the first roll along the extension direction of the groove and then connect with the starting end of the material strip. Compared with the groove structure in which the groove is directly opened along the radial direction of the first roll, the diaphragm will extend out of the first roll along the tangential direction of the first roll when passing through the arc groove. The diaphragm is easier to fit to the outer circumferential surface of the first roll, so that the material strip can also fit more closely to the outer circumferential surface of the first roll. Compared with the groove structure in which the groove is opened along the radial direction of the first roll, it is not easy to have a wrinkle structure on the outer circumferential surface of the first roll, and the risk of the diaphragm breaking after passing through the groove vertically is reduced.

[0010] According to some embodiments of the present application, the second reel is rotatably disposed in the inner cavity of the first reel, the groove includes a first groove wall and a second groove wall, the diaphragm contacts the second groove wall, and the second groove wall is an arc-shaped surface.

[0011] In the above scheme, the second groove wall is adopted as an arc surface, and the diaphragm can more easily pass through the groove along the arc surface, so that the diaphragm can fit more closely to the outer peripheral surface of the first reel, thereby making the material belt fit more closely to the outer peripheral surface of the first reel, and the winding and unwinding of the material belt is smoother.

[0012] According to some embodiments of the present application, a roller is rotatably mounted on the second groove wall, and the rotation axis of the roller is in the same direction as the axial direction of the first reel.

[0013] In the above scheme, since the second roll is rotatably arranged in the inner cavity of the first roll, a part of the diaphragm pre-wound on the second roll can be unwound by the rotation of the second roll, thereby reducing the risk of flying material tape due to the inertial rotation of the first roll during the unwinding process of the winding and unwinding equipment. In this case, relative movement will occur between the diaphragm and the groove. By installing a roller on the second groove wall of the groove, the roller can rotate under the action of the movement of the diaphragm, thereby guiding the diaphragm to move in the direction of the groove, reducing the friction between the diaphragm and the second groove wall of the groove, so that the diaphragm can move more smoothly relative to the groove.

[0014] According to some embodiments of the present application, the number of rollers is set to multiple, and the multiple rollers are distributed on the second groove wall at intervals from the inner circumference to the outer circumference.

[0015] In the above scheme, by setting the number of rollers to multiple, multiple rollers work together to provide multiple contact points for the diaphragm, which provides a stronger guiding effect on the diaphragm and further reduces the friction between the diaphragm and the second groove wall of the groove, so that the diaphragm can move more smoothly relative to the groove.

[0016] According to some embodiments of the present application, the winding and unwinding device includes a driving member installed in the inner cavity of the first reel, the driving end of the driving member is connected to the main shaft of the second reel, and the driving member is used to drive the second reel to rotate relative to the first reel.

[0017] In the above scheme, by setting the driving member, the driving member is installed in the first reel, and the driving member provides power to the second reel separately, which can meet the corresponding requirements of the unwinding state or the winding state of the unwinding and rewinding equipment. Specifically, since the first reel has rotational inertia when the unwinding is about to end, the material tape on the first reel is prone to flying, so the driving member drives the second reel to rotate, unwinds the membrane part wound on the second reel, provides a buffering effect for the material tape, and reduces the risk of flying tape due to inertial rotation of the first reel. When the first reel just starts to rewind, the driving member drives the second reel to reverse relative to the first reel, provides tension to the membrane, and then pulls the material tape straight, increases a certain winding tension, so that the material tape is more smoothly wound on the outer peripheral surface of the first reel, and improves the winding effect of the material tape.

[0018] According to some embodiments of the present application, the unwinding and winding device also includes a detection component and a control module, the detection component is used to detect the winding thickness of the material tape on the first reel; the detection component, the driving member and the driving mechanism are all electrically connected to the control module, and the driving mechanism is used to drive the first reel to rotate; wherein, when the unwinding and winding device is in the unwinding state, and the detection component detects that the winding thickness of the material tape on the first reel is lower than the first preset thickness, the control module controls the driving mechanism to stop driving the first reel to rotate and controls the driving member to work after a preset time interval; when the unwinding and winding device is in the winding state, and the detection component detects that the winding thickness of the material tape on the first reel is greater than the second preset thickness, the control module controls the driving member to stop working.

[0019] In the above scheme, through the setting of the detection component, the detection component can monitor the winding thickness of the material tape on the first reel in real time, so that the control module can obtain the winding thickness of the material tape on the first reel through the detection component, and automatically control the driving mechanism and the driving member to perform corresponding actions, so as to achieve better winding of the material tape when winding or reduce the probability of flying tape when unwinding, without human participation and with a high degree of automation.

[0020] Specifically, when the reeling and unwinding device is in the unwinding state, and the detection component detects that the winding thickness of the material tape on the first reel is lower than the first preset thickness, it indicates that the material tape on the first reel is about to be unwound. At this time, the control module controls the driving mechanism to stop driving the first reel to rotate, allowing the first reel to rotate with inertia. After calculating the preset time interval, the control module determines that the material tape on the first reel is close to being unwound. However, considering the influence of the external environment or working conditions, the control module controls the driving member to work, and the driving member can allow the film on the second reel to continue to unwind to meet the unwinding of the material tape, thereby avoiding the phenomenon of flying material tape due to the first reel still being in a rotating state after the unwinding of the material tape on the first reel is completed. When the unwinding and rewinding device is in the winding state, the control module controls the driving member to reverse relative to the first reel, straightens the membrane and the material tape, and provides winding tension to the material tape. When the detection component detects that the winding thickness of the material tape on the first reel is greater than the second preset thickness, it indicates that the material tape on the first reel has been wound at least one circle. The control module controls the driving member to stop reversing and allows the second reel to rotate synchronously with the first reel to complete the winding of the material tape.

[0021] According to some embodiments of the present application, the winding and unwinding device also includes a first bracket and a second bracket, which are installed in the first reel and are respectively located on both sides of the axial direction of the second reel, and the driving member is installed on the first bracket. One end of the main shaft of the second reel is connected to the driving member, and the other end is rotatably installed on the second bracket through a bearing.

[0022] In the above scheme, a first bracket and a second bracket are arranged in the inner cavity of the first reel, and the first bracket provides an installation function for the driving member, so that the driving member can be stably installed on the first bracket. One end of the main shaft of the second reel is connected to the driving member, and the other end is rotatably installed on the second bracket, so that the driving member can drive the second reel to rotate relative to the first reel.

[0023] According to some embodiments of the present application, along the axial direction of the first reel, the inner cavity of the first reel is provided with a reinforcing unit on the outer side of the second reel, and the circumferential side of the reinforcing unit is used to abut against the inner circumferential surface of the first reel to provide circumferential support force to the first reel.

[0024] In the above scheme, since the first reel is a cylindrical structure, a reinforcing unit is provided in the second area of ​​the first reel. The reinforcing unit can provide support function to the end of the first reel, can strengthen the strength of the first reel, and improve the durability and load-bearing capacity of the first reel.

[0025] The reinforcing unit is a honeycomb support structure, which has the characteristics of light weight and high strength. The reinforcing unit can be made of aluminum, for example, an aluminum honeycomb panel.

[0026] According to some embodiments of the present application, the number of the reinforcing units is set to be multiple, and the multiple reinforcing units are respectively located on both axial sides of the second reel.

[0027] In the above solution, by setting the number of reinforcing units to be multiple, the multiple reinforcing units can provide sufficient support functions for the axial ends of the first reel, so that the integrity of the first reel is stronger and the structural strength is higher.

[0028] In a second aspect, an embodiment of the present application further provides a battery production line, which includes the winding and unwinding device of any of the aforementioned embodiments.

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the structure of the reeling and unreeling equipment in some embodiments of the present application;

[0032] Figure 2 for Figure 1 Top view of the winding and unwinding equipment;

[0033] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0034] Figure 4 This is a schematic structural diagram of the reeling and unreeling device from another angle in some embodiments of the present application;

[0035] Figure 5 for Figure 4 Top view of the winding and unwinding equipment;

[0036] Figure 6 for Figure 5 Cross-sectional view of the middle BB;

[0037] Figure 7 This is a schematic diagram of the structure of a clamping shaft of a belt device in a reeling and unreeling device in some embodiments of the present application;

[0038] Figure 8 This is a control logic diagram of a control module of a winding and unwinding device in some embodiments of the present application.

[0039] Icons: 100-rewinding and unwinding equipment; 10-first reel; 11-inner cavity; 12-inner circumference; 13-outer circumference; 14-groove; 141-first groove wall; 142-second groove wall; 143-first opening end; 144-second opening end; 20-second reel; 21-diaphragm; 22-main shaft; 30-roller; 31-support roller; 40-driving member; 41-detection component; 42-control module; 50-driving mechanism; 51-equipment clamping shaft; 60-first bracket; 61-second bracket; 70-reinforcement unit; 80-roller; 200-material strip. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0045] The term "multiple" as used in the present application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0046] At present, in the battery manufacturing process, the pole piece in the battery is one of the important components. During the winding or unwinding process of the pole piece, the starting end of the pole piece is generally attached to the reel of the winding and unwinding equipment with tape, but the amount of tape used is difficult to control. When the amount of tape used is too much, it is easy to cause glue to remain on the surface of the reel, which is inconvenient to clean, and the tape residue on the reel will contaminate the pole piece. When the amount of tape used is too little, the pole piece is prone to be not firmly fixed.

[0047] Based on the above considerations, in order to better fix the starting end of the electrode sheet, the present application designs a winding and unwinding device, which includes a first reel and a second reel, the first reel having an inner cavity; the second reel is arranged in the inner cavity of the first reel, and a diaphragm is wound on the second reel, and one end of the diaphragm is fixed to the second reel; along the radial direction of the first reel, the first reel has a relative outer circumferential surface and an inner circumferential surface, and the first reel is provided with a groove that passes through the inner circumferential surface and the outer circumferential surface of the first reel, and the groove is used for the other end of the diaphragm to pass through so as to connect with the starting end of the material strip.

[0048] In such a winding and unwinding device, one end of the film on the second roll can pass through the groove and extend out of the first roll to connect with the starting end of the material tape. Compared with the starting end of the material tape being fixed to the outer circumference of the first roll by conventional gluing, the method of extending the film on the second roll through the groove and connecting with the material tape does not require consideration of the amount of glue used. It is only necessary to ensure that the film is firmly connected to the starting end of the material tape. The fixing effect of the material tape is good, and there will be no glue left on the outer circumference of the first roll or the material tape will not be firmly fixed.

[0049] The present application embodiment provides a winding and unwinding device, please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of the reeling and unreeling equipment in some embodiments of the present application; Figure 2 for Figure 1 Top view of the winding and unwinding equipment; Figure 3 for Figure 2The sectional view of AA in the figure. The winding and unwinding device 100 is used for winding or unwinding the material strip 200. The winding and unwinding device 100 comprises a first reel 10 and a second reel 20. The first reel 10 has an inner cavity 11. The second reel 20 is arranged in the inner cavity 11 of the first reel 10. A film 21 is wound on the second reel 20. One end of the film 21 is fixed to the second reel 20. In the radial direction of the first reel 10, the first reel 10 has an outer peripheral surface 13 and an inner peripheral surface 12 opposite to each other. The first reel 10 is provided with a groove 14 that penetrates the inner peripheral surface 12 and the outer peripheral surface 13 of the first reel 10. The groove 14 is used for the other end of the film 21 to pass through so as to connect with the starting end of the material strip 200.

[0050] The first reel 10 is a cylindrical structure, the inner cavity 11 refers to the inner space of the cylindrical structure of the first reel 10, and the second reel 20 is also a cylindrical structure, and the second reel 20 is arranged in the inner cavity 11 of the first reel 10. The radial direction refers to the linear direction of the diameter or radius of the first reel 10, or the linear direction perpendicular to the axial direction. The outer circumference 13 refers to the outer surface area of ​​the outer circumference of the first reel 10, and the inner circumference 12 refers to the inner surface area of ​​the inner circumference of the first reel 10.

[0051] The starting end of the material tape 200 refers to an end of the material tape 200 in the length direction, that is, the end of the material tape 200 that first contacts the first reel 10 . The material tape 200 may be a pole piece material tape 200 .

[0052] The groove 14 is arranged through the inner circumference 12 and the outer circumference 13 of the first roll 10, so that the diaphragm 21 of the second roll 20 can be inserted into the groove 14, which is convenient for connection with the starting end of the material tape 200. The diaphragm 21 and the starting end of the material tape 200 can be bonded. There is an overlap length between the diaphragm 21 and the starting end of the material tape 200, and the amount of glue should ensure that the starting end of the diaphragm 21 and the material tape 200 are firmly bonded.

[0053] The groove 14 can be arranged to penetrate the first roll 10 along the radial direction, or the groove 14 can penetrate the inner circumference 12 and the outer circumference 13 of the first roll 10 at an inclined angle to the radial direction of the first roll 10, that is, the two open ends of the groove 14 on the inner circumference 12 and the outer circumference 13 of the first roll 10 are staggered in the circumferential direction of the first roll 10.

[0054] In the technical solution of the embodiment of the present application, the material strip 200 can be a pole piece material strip 200 for battery manufacturing, and a groove 14 is provided on the first reel 10, and the groove 14 is arranged through the inner circumference 12 and the outer circumference 13 of the first reel 10, and the inner cavity 11 of the first reel 10 is provided with a second reel 20, and the second reel 20 is wound with a diaphragm 21, so that one end of the diaphragm 21 on the second reel 20 can pass through the groove 14 and extend out of the first reel 10 and the starting point of the material strip 200 The starting end connection is compared to the method in which the starting end of the material tape 200 is fixed to the outer circumferential surface 13 of the first reel 10 by conventional gluing. The method in which the diaphragm 21 on the second reel 20 extends out of the groove 14 to connect with the material tape 200 does not require consideration of the amount of glue used. It is only necessary to ensure that the diaphragm 21 is firmly connected to the starting end of the material tape 200. This has a good fixing effect on the material tape 200 and there will be no glue remaining on the outer circumferential surface 13 of the first reel 10 or the material tape 200 being loosely fixed.

[0055] According to some embodiments of this application, please refer to Figure 3 The groove 14 has a first opening end 143 on the inner circumferential surface 12 and a second opening end 144 on the outer circumferential surface 13 , and the first opening end 143 and the second opening end 144 are staggered in the circumferential direction of the first reel 10 .

[0056] The first opening end 143 refers to the opening of the groove 14 on the inner circumferential surface 12 of the first drum 10 , the second opening end 144 refers to the opening of the groove 14 on the outer circumferential surface 13 of the first drum 10 , and the circumferential direction refers to the circumferential direction of the first drum 10 .

[0057] The first opening end 143 and the second opening end 144 are staggered in the circumferential direction of the first reel 10, which means that there is an angle between the first opening end 143 and the second opening end 144 in the circumferential direction of the first reel 10. Of course, the groove 14 can be an arc groove or a linear groove.

[0058] By staggering the first open end 143 and the second open end 144 of the groove 14 in the circumferential direction of the first roll 10, it is convenient for the diaphragm 21 to extend out of the outer circumferential surface 13 of the first roll 10 along the extension direction of the groove 14 and then connect with the starting end of the material strip 200. Compared with the groove 14 structure in which the groove 14 is directly opened along the radial direction of the first roll 10, the diaphragm 21 will extend out of the first roll 10 along the tangential direction of the first roll 10 when passing through the arc groove. The diaphragm 21 is easier to fit to the outer circumferential surface 13 of the first roll 10, so that the material strip 200 can also fit more closely to the outer circumferential surface 13 of the first roll 10. Compared with the groove 14 structure in which the groove 14 is opened along the radial direction of the first roll 10, it is less likely to have a wrinkle structure on the outer circumferential surface 13 of the first roll 10, and the risk of the diaphragm 21 being easily broken after vertically passing through the groove 14 is also reduced.

[0059] According to some embodiments of this application, please continue to refer to Figure 3 The second reel 20 is rotatably disposed in the inner cavity 11 of the first reel 10 , the groove 14 includes a first groove wall 141 and a second groove wall 142 , the diaphragm 21 contacts the second groove wall 142 , and the second groove wall 142 is an arc-shaped surface.

[0060] The second reel 20 is rotatably disposed in the inner cavity 11 of the first reel 10, which means that the second reel 20 can rotate relative to the first reel 10 in the inner cavity 11 of the first reel 10. The first groove wall 141 and the second groove wall 142 refer to two opposite side walls of the groove 14, and the diaphragm 21 will contact the second groove wall 142 when passing through the groove 14.

[0061] The surface of the second groove wall 142 is an arc-shaped surface, and the diaphragm 21 can more easily pass through the groove 14 along the arc-shaped surface, so that the diaphragm 21 can fit more closely to the outer peripheral surface 13 of the first reel 10, thereby making the material tape 200 fit more closely to the outer peripheral surface 13 of the first reel 10, and the winding and unwinding of the material tape 200 can be smoother.

[0062] According to some embodiments of the present application, a roller 30 is rotatably mounted on the second groove wall 142 , and the rotation axis of the roller 30 is in the same direction as the axial direction of the first reel 10 .

[0063] The roller 30 refers to a guide roller component rotatably mounted on the second groove wall 142. The roller 30 itself has no power. When the diaphragm 21 passes through the groove 14, the diaphragm 21 drives the roller 30 to rotate. The side of the roller 30 close to the first groove wall 141 is flush with the surface where the second groove wall 142 is located. Of course, the side of the roller 30 close to the first groove wall 141 can also protrude from the surface where the second groove wall 142 is located, and the protrusion depends on the actual situation.

[0064] Since the second reel 20 is rotatably disposed in the inner cavity 11 of the first reel 10, a portion of the diaphragm 21 pre-wound on the second reel 20 can be unwound by the rotation of the second reel 20, thereby reducing the risk of the material tape 200 flying due to the inertial rotation of the first reel 10 during the unwinding process of the winding and unwinding equipment. In this case, relative movement will occur between the diaphragm 21 and the groove 14. By installing a roller 30 on the second groove wall 142 of the groove 14, the roller 30 can rotate under the action of the movement of the diaphragm 21, thereby guiding the diaphragm 21 to move in the direction of the groove 14, reducing the friction between the diaphragm 21 and the second groove wall 142 of the groove 14, so that the diaphragm 21 can move more smoothly relative to the groove 14.

[0065] Of course, a support roller 31 may be installed at a position of the first groove wall 141 close to the second opening end 144 . The support roller 31 is rotatably installed on the first groove wall 141 , and the support roller 31 can provide a support function for the feeding belt 200 .

[0066] According to some embodiments of the present application, the number of the rollers 30 is set to be multiple, and the multiple rollers 30 are distributed at intervals on the second groove wall 142 in the direction from the first opening end 143 to the second opening end 144 .

[0067] The number of the rollers 30 is multiple, which means that the number of the rollers 30 can be two, three or four, etc., and the number of the rollers 30 is determined according to the actual situation. Optionally, the number of the rollers 30 is three, and the three rollers 30 are distributed on the second groove wall 142 at intervals along the direction from the first opening end 143 to the second opening end 144. The three rollers 30 can be distributed on the second groove wall 142 at equal intervals or at unequal intervals.

[0068] By setting the number of rollers 30 to be multiple, the multiple rollers 30 cooperate with each other to provide multiple contact points for the diaphragm 21, thereby providing a stronger guiding effect for the diaphragm 21 and further reducing the friction between the diaphragm 21 and the second groove wall 142 of the groove 14, so that the diaphragm 21 can move more smoothly relative to the groove 14.

[0069] According to some embodiments of this application, please refer to Figures 4 to 6 , Figure 4 This is a schematic structural diagram of the reeling and unreeling device from another angle in some embodiments of the present application; Figure 5 for Figure 4 Top view of the winding and unwinding equipment; Figure 6 for Figure 5 The reeling and unreeling device 100 includes a driving member 40 , which is installed in the inner cavity 11 of the first reel 10 , and a driving end of the driving member 40 is connected to the main shaft 22 of the second reel 20 , and the driving member 40 is used to drive the second reel 20 to rotate relative to the first reel 10 .

[0070] The driving member 40 refers to a driving component capable of providing rotational power to the second reel 20, and the driving member 40 may be a motor. The main shaft 22 of the second reel 20 refers to the rotation axis of the second reel 20, and the axis of the main shaft 22 of the second reel is colinear with the axis of the first reel 10. The driving end of the driving member 40 refers to the driving shaft of the driving member 40, and the driving member 40 is connected to the main shaft 22 of the second reel 20 to provide rotational power to the second reel 20.

[0071] By setting the driving member 40, the driving member 40 is installed in the first reel 10, and the driving member 40 provides power to the second reel 20 separately, which can meet the corresponding requirements of the unwinding state or the winding state of the unwinding device. Specifically, when the unwinding device is in the unwinding state, since the first reel 10 has rotational inertia when the unwinding is about to end, the material belt 200 on the first reel 10 is prone to flying, so the driving member 40 drives the second reel 20 to rotate, unwinds part of the film 21 wound on the second reel 20, provides a buffering effect for the material belt 200, and reduces the risk of flying due to the inertial rotation of the first reel 10. When the reel 10 is in the reeling state, when the first reel 10 just starts to reel, the driving member 40 drives the second reel 20 to reverse relative to the first reel 10, providing tension to the diaphragm 21, thereby pulling the material strip 200 straight, increasing a certain reeling tension, so that the material strip 200 can be more smoothly wound on the outer peripheral surface 13 of the first reel 10, thereby improving the winding effect of the material strip 200.

[0072] According to some embodiments of this application, please refer to Figure 4 and Figure 8 , Figure 4 This is a schematic structural diagram of the reeling and unreeling device from another angle in some embodiments of the present application; Figure 8 The control logic diagram of the control module 42 of the winding and unwinding device of some embodiments of the present application. The winding and unwinding device also includes a detection component 41 and a control module 42, wherein the detection component 41 is used to detect the winding thickness of the material tape 200 on the first reel 10; the detection component 41, the driving member 40 and the driving mechanism 50 are all electrically connected to the control module 42, and the driving mechanism 50 is used to drive the first reel 10 to rotate; wherein, when the winding and unwinding device is in the unwinding state, and the detection component 41 detects that the winding thickness of the material tape 200 on the first reel 10 is lower than the first preset thickness, the control module 42 controls the driving mechanism 50 to stop driving the first reel 10 to rotate and controls the driving member 40 to work after an interval of a preset time length; when the winding and unwinding device is in the winding state, and the detection component 41 detects that the winding thickness of the material tape 200 on the first reel 10 is greater than the second preset thickness, the control module 42 controls the driving member 40 to stop working.

[0073] The control module 42, i.e., the controller, is a main command device that changes the wiring of the main circuit or control circuit and the resistance value in the circuit in a predetermined order to control the start, speed regulation, braking and reversal of the motor. It is composed of a program counter, an instruction register, an instruction decoder, a timing generator and an operation controller. It is the "decision-making body" that issues commands, that is, it completes the coordination and command of the operation of the entire computer system.

[0074] The driving mechanism 50 refers to a driving component capable of driving the first reel 10 to rotate. The driving mechanism 50 is connected to the axial end of the first reel 10 to drive the first reel 10 to rotate. Optionally, the driving mechanism 50 includes a driving motor and a device clamping shaft 51. The driving motor is drivingly connected to the device clamping shaft 51. The device clamping shaft 51 can extend into the cavities at both axial ends of the first reel 10 and be clamped and fixed to the inner circumferential surface 12 of the first reel 10, thereby driving the first reel 10. The device clamping shaft 51 is a prior art and will not be described in detail here.

[0075] The detection component 41 refers to a detection component that can detect the winding thickness of the material tape 200 on the first reel 10. The detection component 41 can be of various types. For example, the detection component 41 can be an infrared sensor module. The infrared sensor module includes an infrared transmitter and an infrared receiver. The infrared transmitter and the infrared receiver are respectively arranged at the two ends of the axial direction of the first reel 10. The infrared transmitter emits infrared rays, and the infrared receiver receives the infrared rays emitted by the infrared transmitter.

[0076] Of course, the number of infrared sensor modules in the detection component 41 can be two groups, namely a first infrared sensor module and a second infrared sensor module. The first infrared sensor module is used to work when the unwinding device is in the unwinding state to detect whether the winding thickness of the material strip 200 is lower than the first preset thickness. The second infrared sensor module is used to work when the unwinding device is in the winding state to detect whether the winding thickness of the material strip 200 is higher than the second preset thickness.

[0077] Taking the winding and unwinding device 100 in the unwinding state as an example, the first infrared sensor module works. When the winding thickness of the material tape 200 on the first reel 10 is high, the material tape 200 blocks the infrared rays emitted by the infrared transmitter, and the infrared receiver cannot receive the signal emitted by the infrared transmitter. When the winding thickness of the material tape 200 on the first reel 10 is lower than the first preset thickness, the material tape loses its blocking effect on the infrared rays emitted by the infrared transmitter, and the infrared receiver can receive the infrared signal emitted by the infrared transmitter. At this time, after the control module 42 receives the feedback signal from the detection component 41, it controls the drive mechanism 50 to stop driving the first reel 10 to rotate and controls the drive member 40 to work after the preset time interval. The controller is programmed with a timing module, which can provide a timing function.

[0078] When the unwinding and rewinding device 100 is in the rewinding state, the second infrared sensor module works. When there is no tape 200 on the first reel 10, the infrared receiver can receive the signal sent by the infrared transmitter. At this time, after the control module 42 receives the feedback signal from the detection component 41, it controls the driving mechanism 50 and the driving member 40 to work. The driving member 40 drives the second reel 20 to reverse relative to the first reel 10, and provides the rewinding tension to the tape, so that the tape is more closely attached to the outer peripheral surface of the first reel 10. When the winding thickness of the tape 200 on the first reel 10 is higher than the second preset thickness, it means that the tape has been wound on the first reel 10 for at least one round. The tape blocks the infrared rays sent by the infrared transmitter, and the infrared receiver cannot receive the infrared signal sent by the infrared transmitter. After the control module 42 receives the feedback signal from the detection component 41, it controls the driving member 40 to stop working. A timing module is programmed on the control module, and the timing module can provide a timing function.

[0079] Through the setting of the detection component 41, the detection component 41 can monitor the winding thickness of the material tape 200 on the first reel 10 in real time, so that the control module 42 can obtain the winding thickness of the material tape 200 on the first reel 10 through the detection component 41, and automatically control the driving mechanism 50 and the driving member 40 to perform corresponding actions, so as to achieve better winding of the material tape 200 when winding or reduce the probability of flying tape of the material tape 200 when unwinding, without human participation, and with a high degree of automation.

[0080] Specifically, when the reeling and unwinding device is in the unwinding state, and the detection component 41 detects that the winding thickness of the material tape 200 on the first reel 10 is lower than the first preset thickness, it indicates that the material tape 200 on the first reel 10 is about to be unwound. At this time, the control module 42 controls the driving mechanism 50 to stop driving the first reel 10 to rotate, allowing the first reel 10 to rotate with inertia. After the control module 42 calculates the preset interval time, the material tape 200 on the first reel 10 is close to being unwound. However, considering the influence of the external environment or working conditions, the control module 42 controls the driving member 40 to work. The driving member 40 can allow the diaphragm 21 on the second reel 20 to continue to unwind, so as to meet the unwinding of the material tape 200, and avoid the phenomenon of the material tape 200 flying due to the first reel 10 still being in a rotating state after the unwinding of the material tape 200 on the first reel 10 is completed. When the unwinding and rewinding device is in the winding state, the control module 42 controls the driving member 40 to reverse relative to the first reel 10, straightens the diaphragm 21 and the material tape 200, and provides tension to the material tape 200. When the detection component 41 detects that the winding thickness of the material tape 200 on the first reel 10 is greater than the second preset thickness, it indicates that the material tape 200 on the first reel 10 has been wound at least one circle. The control module 42 controls the driving member 40 to stop reversing, allowing the second reel 20 to rotate synchronously with the first reel 10 to complete the winding of the material tape 200.

[0081] According to some embodiments of this application, please refer to Figure 6 , Figure 6 for Figure 5 The reeling and unreeling device further comprises a first bracket 60 and a second bracket 61, which are installed in the first reel 10 and are respectively located on both sides of the axial direction of the second reel 20, the driving member 40 is installed on the first bracket 60, one end of the main shaft 22 of the second reel 20 is connected to the driving member 40, and the other end is rotatably installed on the second bracket 61 through a bearing.

[0082] The first bracket 60 is fixedly mounted in the inner cavity 11 of the first reel 10. The first bracket 60 is a frame structure for mounting the driving member 40. Similarly, the second bracket 61 is also fixedly mounted in the inner cavity 11 of the first reel 10. The first bracket 60 and the second bracket 61 are respectively located on both sides of the axial direction of the first reel 10. The main shaft 22 of the second reel 20 is rotatably mounted on the second bracket 61 through a bearing. Of course, in order to improve the rotational stability of the main shaft 22 of the second reel 20, a bearing can also be mounted on the first bracket 60, and the bearing provides a support function for the main shaft 22 of the second reel 20 close to the driving member 40.

[0083] By disposing a first bracket 60 and a second bracket 61 in the inner cavity 11 of the first reel 10, the first bracket 60 provides an installation function for the driving member 40, so that the driving member 40 can be stably installed on the first bracket 60, and one end of the main shaft 22 of the second reel 20 is drivingly connected to the driving member 40, and the other end is rotatably installed on the second bracket 61, so that the driving member 40 can drive the second reel 20 to rotate relative to the first reel 10.

[0084] According to some embodiments of this application, please refer to Figure 4 and Figure 6 Along the axial direction of the first reel 10 , the inner cavity 11 of the first reel 10 is provided with a reinforcing unit 70 on the outer side of the second reel 20 , and the circumferential side of the reinforcing unit 70 is used to abut against the inner circumferential surface 12 of the first reel 10 to provide circumferential support force to the first reel 10 .

[0085] The abutment means that the outer peripheral side of the reinforcing unit 70 abuts against and is connected to the inner peripheral surface 12 of the first drum 10 .

[0086] Since the first reel 10 is a cylindrical structure, a reinforcing unit 70 is provided on one axial side of the first reel 10 . The reinforcing unit 70 can provide a supporting function for the end of the first reel 10 , and can reinforce the strength of the first reel 10 , thereby improving the durability and load-bearing capacity of the first reel 10 .

[0087] The reinforcing unit 70 is a honeycomb support structure, which has the characteristics of light weight and high strength. The reinforcing unit 70 can be made of various materials, for example, the reinforcing unit can be made of aluminum, such as an aluminum honeycomb panel.

[0088] According to some embodiments of the present application, the number of the reinforcing units 70 is set to be multiple, and the multiple reinforcing units 70 are respectively located at the axial ends of the first reel 10 .

[0089] The number of the reinforcing units 70 may be two, four or six, etc. Optionally, there are two reinforcing units 70 , and the two reinforcing units 70 are respectively located at two axial ends of the first reel 10 .

[0090] By setting the number of reinforcing units 70 to be multiple, the multiple reinforcing units 70 can provide support functions for both axial ends of the first reel 10, so that the integrity of the first reel 10 is stronger.

[0091] The inner circumference 12 of the first reel 10 is provided with a roller 80 on the outer side of the reinforcing unit 70, and the roller 80 is installed on the inner circumference 12 of the first reel 10 through a bearing. The roller 80 is used to contact the device clamping shaft 51 of the driving mechanism 50. After the device clamping shaft 51 is loosened from the first reel 10, the first reel 10 contacts the device clamping shaft 51 through the roller 80, thereby reducing the friction between the first reel 10 and the device clamping shaft 51.

[0092] An embodiment of the present application also provides a battery production line, which includes the winding and unwinding device of any of the aforementioned embodiments.

[0093] In some embodiments, please refer to Figures 1 to 8 The reeling and unreeling device includes a first reel 10 and a second reel 20. The first reel 10 has an inner cavity 11. The second reel 20 is arranged in the inner cavity 11 of the first reel 10. A film 21 is wound on the second reel 20. One end of the film 21 is fixed to the second reel 20. In the radial direction of the first reel 10, the first reel 10 has an outer peripheral surface 13 and an inner peripheral surface 12 opposite to each other. The first reel 10 is provided with a groove 14 that penetrates the inner peripheral surface 12 and the outer peripheral surface 13 of the first reel 10. The groove 14 is used for the film 21 to be wound on the second reel 20. The other end of the groove 14 is passed through to connect with the starting end of the material strip 200, the groove 14 has a first opening end 143 on the inner circumferential surface 12, and a second opening end 144 on the outer circumferential surface 13, the first opening end 143 and the second opening end 144 are staggered in the circumferential direction of the first reel 10, the second reel 20 is rotatably arranged in the inner cavity 11 of the first reel 10, the groove 14 includes a first groove wall 141 and a second groove wall 142, the diaphragm 21 is in contact with the second groove wall 142, and the second groove wall 142 is an arcuate surface.

[0094] A groove 14 is provided on the first reel 10, and the groove 14 passes through the inner circumference 12 and the outer circumference 13 of the first reel 10. A second reel 20 is provided in the inner cavity 11 of the first reel 10, and a diaphragm 21 is wound on the second reel 20, so that one end of the diaphragm 21 on the second reel 20 can pass through the groove 14 and extend out of the first reel 10 to be connected with the starting end of the material tape 200. Compared with the starting end of the material tape 200 being fixed to the outer circumference 13 of the first reel 10 by conventional gluing, the method of extending the diaphragm 21 on the second reel 20 out of the groove 14 and connecting with the material tape 200 does not need to consider the amount of glue used in the tape. It is only necessary to make the diaphragm 21 and the starting end of the material tape 200 firmly connected. The fixing effect of the material tape 200 is good, and there will be no glue left on the outer circumference 13 of the first reel 10 or the material tape 200 will not be firmly fixed. The first open end 143 and the second open end 144 of the groove 14 are staggered in the circumferential direction of the first roll 10, so that the diaphragm 21 can be connected to the starting end of the material strip 200 after extending out of the outer circumferential surface 13 of the first roll 10 along the extension direction of the groove 14. Compared with the groove 14 structure in which the groove 14 is directly opened along the radial direction of the first roll 10, the diaphragm 21 will extend out of the first roll 10 along the tangential direction of the first roll 10 when passing through the arc groove. The diaphragm 21 is easier to fit to the outer circumferential surface 13 of the first roll 10, so that the material strip 200 can also fit more closely to the outer circumferential surface 13 of the first roll 10. Compared with the groove 14 structure in which the groove 14 is opened along the radial direction of the first roll 10, it is not easy to have a wrinkle structure on the outer circumferential surface 13 of the first roll 10, and the risk of the diaphragm 21 being easily broken after vertically passing through the groove 14 is also reduced.

[0095] In some embodiments, a roller 30 is rotatably mounted on the second groove wall 142, and the rotation axis of the roller 30 is in the same direction as the axial direction of the first reel 10. The number of rollers 30 is set to be multiple, and the multiple rollers 30 are distributed at intervals on the second groove wall 142 in the direction from the first opening end 143 to the second opening end 144.

[0096] The rotation of the second reel 20 can unwind a portion of the film 21 pre-wound on the second reel 20, thereby reducing the risk of the material strip 200 flying due to the inertial rotation of the first reel 10 during the unwinding process of the reeling and unwinding device. In this case, relative movement occurs between the film 21 and the groove 14. By installing a roller 30 on the second groove wall 142 of the groove 14, the roller 30 can rotate under the movement of the film 21, thereby guiding the film 21 to move along the direction of the groove 14, reducing the friction between the film 21 and the second groove wall 142 of the groove 14, so that the film 21 can move more smoothly relative to the groove 14. The cooperation between multiple rollers 30 can provide multiple contact points for the film 21, provide a stronger guiding effect on the film 21, further reduce the friction between the film 21 and the second groove wall 142 of the groove 14, so that the film 21 can move more smoothly relative to the groove 14.

[0097] In some embodiments, the winding and unwinding device includes a driving member 40, which is installed in the inner cavity 11 of the first reel 10, and the driving end of the driving member 40 is connected to the main shaft 22 of the second reel 20, and the driving member 40 is used to drive the second reel 20 to rotate relative to the first reel 10. The unwinding and winding device also includes a detection component 41 and a control module 42, the detection component 41 is used to detect the winding thickness of the material tape 200 on the first reel 10; the detection component 41, the driving member 40 and the driving mechanism 50 are all electrically connected to the control module 42, and the driving mechanism 50 is used to drive the first reel 10 to rotate; wherein, when the unwinding and winding device is in the unwinding state, and the detection component 41 detects that the winding thickness of the material tape 200 on the first reel 10 is lower than the first preset thickness, the control module 42 controls the driving mechanism 50 to stop driving the first reel 10 to rotate and controls the driving member 40 to work after an interval of a preset time length; when the unwinding and winding device is in the winding state, and the detection component 41 detects that the winding thickness of the material tape 200 on the first reel 10 is greater than the second preset thickness, the control module 42 controls the driving member 40 to stop working.

[0098] By setting the drive member 40, the drive member 40 is installed in the first reel 10, and the drive member 40 provides power to the second reel 20 separately, which can meet the corresponding requirements of the unwinding state or the winding state of the unwinding and rewinding equipment. The detection component 41 can monitor the winding thickness of the material tape 200 on the first reel 10 in real time, so that the control module 42 can automatically control the driving mechanism 50 and the drive member 40 to perform corresponding actions according to the winding thickness of the material tape 200 on the first reel 10 obtained by the detection component 41, so as to achieve better winding of the material tape 200 when winding or reduce the probability of flying tape of the material tape 200 when unwinding, without human participation, and with a high degree of automation.

[0099] In some embodiments, the reeling and unreeling device further comprises a first bracket 60 and a second bracket 61, which are installed in the first reel 10 and are respectively located at two axial sides of the second reel 20, the driving member 40 is installed on the first bracket 60, one end of the main shaft 22 of the second reel 20 is connected to the driving member 40, and the other end is rotatably installed on the second bracket 61 through a bearing. Along the axial direction of the first reel 10, the inner cavity 11 of the first reel 10 is provided with a reinforcing unit 70 on the outer side of the second reel 20, and the circumferential side of the reinforcing unit 70 is used to abut against the inner circumferential surface 12 of the first reel 10 to provide circumferential support force to the first reel 10. The number of the reinforcing units 70 is set to be multiple, and the multiple reinforcing units 70 are respectively located at two axial ends of the first reel 10.

[0100] The first bracket 60 provides a mounting function for the driving member 40, so that the driving member 40 can be stably mounted on the first bracket 60. One end of the main shaft 22 of the second reel 20 is drivingly connected to the driving member 40, and the other end is rotatably mounted on the second bracket 61, so that the driving member 40 can drive the second reel 20 to rotate relative to the first reel 10. By providing a reinforcing unit 70 on one axial side of the first reel 10, the reinforcing unit 70 can provide a support function for the end of the first reel 10, can strengthen the strength of the first reel 10, and improve the durability and bearing capacity of the first reel 10.

[0101] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A winding and unwinding device for winding or unwinding a material strip, characterized in that: include: A first reel having an inner cavity; A second reel is disposed in the inner cavity of the first reel, a film is wound on the second reel, and one end of the film is fixed to the second reel; Among them, along the radial direction of the first roll, the first roll has relative outer circumference and inner circumference, and the first roll is provided with a groove that runs through the inner circumference and outer circumference of the first roll, and the groove is used for the other end of the diaphragm to pass through so as to be connected with the starting end of the material strip.

2. The unwinding and rewinding device according to claim 1, characterized in that: The groove has a first opening end on the inner circumferential surface and a second opening end on the outer circumferential surface, and the first opening end and the second opening end are staggered in the circumferential direction of the first reel.

3. The unwinding and rewinding device according to claim 2, characterized in that: The second reel is rotatably disposed in the inner cavity of the first reel, the groove comprises a first groove wall and a second groove wall, the diaphragm is in contact with the second groove wall, and the second groove wall is an arc-shaped surface.

4. The unwinding and rewinding device according to claim 3, characterized in that: A roller is rotatably mounted on the second groove wall, and the rotation axis of the roller is in the same direction as the axial direction of the first reel.

5. The reeling and unreeling device according to claim 4, characterized in that: The number of the rollers is set to be multiple, and in the direction from the first opening end to the second opening end, the multiple rollers are distributed at intervals on the second groove wall.

6. The unwinding and rewinding device according to any one of claims 1 to 5, characterized in that: The reeling and unreeling equipment comprises: A driving member is installed in the inner cavity of the first reel, a driving end of the driving member is connected to the main shaft of the second reel, and the driving member is used to drive the second reel to rotate relative to the first reel.

7. The unwinding and rewinding device according to claim 6, characterized in that: The reeling and unreeling device also includes: A detection component, used for detecting the winding thickness of the material tape on the first reel; A control module, the detection component, the driving member and the driving mechanism are all electrically connected to the control module, and the driving mechanism is used to drive the first reel to rotate; Among them, when the unwinding and winding device is in the unwinding state, and the detection component detects that the winding thickness of the material tape on the first reel is lower than the first preset thickness, the control module controls the driving mechanism to stop driving the first reel to rotate and controls the driving member to work after a preset time interval; when the unwinding and winding device is in the winding state, and the detection component detects that the winding thickness of the material tape on the first reel is greater than the second preset thickness, the control module controls the driving member to stop working.

8. The unwinding and rewinding device according to claim 6, characterized in that: The reeling and unwinding device also includes a first bracket and a second bracket, the first bracket and the second bracket are installed in the first reel and are respectively located on both sides of the axial direction of the second reel, the driving member is installed on the first bracket, one end of the main shaft of the second reel is connected to the driving member, and the other end is rotatably installed on the second bracket through a bearing.

9. The reeling and unreeling device according to claim 1, characterized in that: Along the axial direction of the first reel, the inner cavity of the first reel is provided with a reinforcing unit on the outer side of the second reel, and the circumferential side of the reinforcing unit is used to abut against the inner circumferential surface of the first reel to provide circumferential supporting force to the first reel.

10. The unwinding and rewinding device according to claim 9, characterized in that: The number of the reinforcing units is set to be multiple, and the multiple reinforcing units are respectively located on both sides of the axial direction of the second reel.

11. A battery production line, characterized in that: It comprises the winding and unwinding equipment according to any one of claims 1-10.

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