Lithium electrode plate unwinding device

Abstract

The lithium electrode plate unwinding device comprises a base and a support located on the rear side of the base, an expansion device used for being detachably and fixedly connected with a coiled lithium electrode plate is arranged on the left side of the base, and a telescopic driving device connected with the expansion device and used for controlling the expansion device to expand or loosen the coiled lithium electrode plate is arranged on the right side of the base. A rotary driving device of which the front end is supported on the base is mounted on the bracket, a rotary output part of the rotary driving device is fixedly connected with the expansion device, and the coiled lithium electrode plates are driven to rotate and uncoil through the expansion device under the driving of the rotary driving device of which the rotating speed is adjustable. Under the combined action of the rotary driving device and the telescopic driving device on the expansion device, the lithium electrode plate fixed on the expansion device in an expansion manner is ensured to have a stable linear speed when the outer diameter of the lithium electrode plate is changed for unwinding, the surface quality of the lithium electrode plate in the unwinding process is ensured, the production efficiency is improved, and the lithium electrode plate unwinding device has relatively high use value.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium electrode sheets, and in particular relates to a lithium electrode sheet unwinding device. Background Art

[0002] When unwinding a lithium electrode sheet, the traditional unwinding process is to place the electrode sheet on a rotating tube and unwind it directly at a fixed speed. This method is not only time-consuming, but also causes tension in the electrode sheet due to the different outer diameters of the electrode sheet rolls, affecting the surface quality of the electrode sheet, and inevitably causes winding deviation. Winding deviation will cause the electrode to be unstable during the unwinding process, increase the downtime of the production line, and reduce production efficiency. Winding deviation will also cause the electrode sheet to deform or be damaged, affecting the quality of the battery. Therefore, in order to solve the above problems, it is necessary to design a lithium electrode sheet unwinding device. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a lithium electrode sheet unwinding device, which is connected to a rotary drive device on the left side of the base and whose expansion or loosening state is controlled by a telescopic drive device on the right side of the base, so as to achieve reliable fixation of the lithium electrode sheet to be unwound that is expanded and fixed on the expansion device under the control of the telescopic drive device, and realize the unwinding action of the lithium electrode sheet under the drive of the rotary drive device, ensuring that the lithium electrode sheet has a stable linear speed when unwinding when the outer diameter of the lithium electrode sheet changes, thereby ensuring the surface quality of the lithium electrode sheet during the unwinding process, improving production efficiency, and having high use value.

[0004] The technical solution adopted in the present invention is: a lithium electrode sheet unwinding device, including a base fixedly connected to the installation position and a bracket located on the rear side of the base, a tightening device for detachably connecting to the rolled lithium electrode sheet is provided on the left side of the base, and a telescopic driving device connected to the tightening device and used to control the tightening device to tighten or loosen the rolled lithium electrode sheet is provided on the right side of the base, a rotating driving device with a front end supported on the base is installed on the bracket, and the rotating output part of the rotating driving device is fixedly connected to the tightening device, and the rolled lithium electrode sheet is driven to rotate and unwind through the tightening device under the drive of the rotating driving device with adjustable rotation speed.

[0005] Among them, the rotation drive device includes a motor, a worm and a worm wheel. The motor is installed on the bracket, and the motor output shaft is connected to the worm rotatably supported on the base through a coupling. A hollow shaft is rotatably installed on the base, which is horizontally arranged and vertically distributed with the worm, and the worm wheel fixed on the hollow shaft is adaptively connected to the worm. The left end of the hollow shaft is fixedly connected to the right end of the expansion sleeve in the expansion device, and the hollow shaft drives the expansion device to rotate synchronously under the drive of the motor.

[0006] Furthermore, a worm gear with its lower end passing through a mounting hole on the base is rotatably supported on the base by bearing seats fixed to the front and rear ends of the base. An avoidance groove connected to the mounting hole is provided inside the base, and a worm wheel located inside the base engages with the worm gear through the avoidance groove.

[0007] Furthermore, downwardly extending mounting plates are fixed on both left and right sides of the base, and an L-shaped bracket is fixed on the outer wall of the lower end of the mounting plate.

[0008] Furthermore, a horizontal mounting hole is formed on the left end surface of the base, which extends through the right end surface and is perpendicularly distributed with the mounting hole for worm mounting thereon, and the mounting hole is connected to the horizontal mounting hole through an avoidance groove. The hollow shaft is rotatably supported on the base by a thrust ball bearing and a deep groove ball bearing installed at the left end of the horizontal mounting hole. The pull rod in the telescopic drive device is adaptively connected to the linear bearings respectively installed at the left and right ends of the horizontal mounting hole, and the pull rod (the left end of which passes through the center hole of the hollow shaft) is fixedly connected to the expansion head of the conical structure in the expansion device.

[0009] Furthermore, the expansion device includes an expansion block, an expansion sleeve, an expansion tube and an expansion head. The expansion sleeve is a stepped sleeve structure composed of a large diameter section at the left end, a small diameter section at the right end, and a connecting ring plate between the large diameter section and the small diameter section. The large diameter section at the left end of the expansion sleeve is adapted to fit into the expansion tube, and the connecting ring plate on the expansion sleeve is fixedly connected to the right end of the expansion tube. The small diameter section at the right end of the expansion sleeve is coaxially fixed to the hollow shaft in the rotary drive device. The expansion sleeve is provided with a conical annular structure with an inner hole formed by connecting three-petal expansion blocks through annular springs at both ends, and the expansion head is located in the conical annular structure formed by the three-petal expansion blocks. The left end of the expansion sleeve is fixed with a ring located in the expansion tube. The inner end cover, the outer circumferential wall of the large diameter section of the expansion sleeve is evenly distributed with the same number and corresponding positions of the expansion blocks. The two positioning grooves arranged on the outer wall of the expansion block respectively correspond to the positions of the two grooves in the U-shaped groove that are perpendicular to the horizontal groove, and the stoppers fixed in the two grooves in the U-shaped groove that are perpendicular to the horizontal groove perform radial positioning of the expansion block. The expansion tube is an annular structure with long grooves staggered on the inner and outer walls provided with positioning ring plates at both ends, and the expansion block extends outward or retracts inward along the horizontal groove of the U-shaped groove when the expansion head moves to the left or right, so as to realize the loosening or expansion of the rolled lithium electrode sheet by the expansion tube with changing diameter.

[0010] Furthermore, the telescopic drive device includes a cylinder and a pull rod, and a side support fixedly connected to the mounting plate is provided on the right side of the base, and the cylinder is installed on the right side wall of the side support. The piston rod end of the cylinder is fixedly connected to the coupling 2 fixed to the right end of the pull rod through a bushing, and the pull rod arranged inside the base and passing through the mounting plate on the right is fixed with a positioning ring located on the outside of the right mounting plate and cooperating with the mounting plate to position the pull rod to the extreme position of the left movement. The left end of the pull rod passes through the hollow shaft in the rotary drive device and is fixedly connected to the expansion head in the expansion device, and the pull rod drives the expansion head in the expansion device to move left or right under the telescopic control of the cylinder piston rod.

[0011] The advantages of the present invention compared with the prior art are: 1. This technical solution provides a tightening device on the left side of the base, which is connected to the rotary drive device and whose tightening or loosening state is controlled by the telescopic drive device on the right side of the base. This ensures that the lithium electrode sheet that needs to be unwound and is tightened and fixed on the tightening device is reliably fixed under the control of the telescopic drive device, and the unwinding action of the lithium electrode sheet is achieved under the drive of the rotary drive device. When the outer diameter of the lithium electrode sheet changes during unwinding, the lithium electrode sheet is ensured to have a stable linear speed, thereby ensuring the surface quality of the lithium electrode sheet during the unwinding process and improving production efficiency. 2. In this technical solution, the cylinder controls the expansion device through the pull rod to expand or loosen the rolled lithium electrode sheet. The tightness of the expansion tube in the diameter direction can be adjusted quickly and conveniently, which improves the convenience of the expansion action. 3. The motor of this technical solution drives the rotating structure of the expansion device through the worm gear, which ensures the stability of the linear speed of the lithium electrode sheet, greatly improves the surface quality of the lithium electrode sheet after unwinding, and improves production efficiency; 4. This technical solution has novel structural design, convenient and quick operation, saves time, reduces costs, and has high use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is the main view of the structure of the present invention; Figure 3 It is a top view of the structure of the present invention; Figure 4 It is a left view of the structure of the present invention; Figure 5 for Figure 3 A partial enlarged schematic diagram in the middle; Figure 6 This is a schematic structural diagram of the expansion device of the present invention; Figure 7 This is a front view of the expansion sleeve structure of the present invention; Figure 8 This is a top view of the expansion sleeve structure of the present invention. DETAILED DESCRIPTION

[0013] The following is a combination of the embodiments of the present invention Figure 1-8 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0014] It should be noted that, in this document, unless otherwise stated, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate positions or relationships based on those shown in the accompanying drawings. These are intended only to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] As used herein, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the elements.

[0016] Lithium electrode sheet unwinding device, such as Figure 1-5As shown, it includes a base 1 fixedly connected to the installation position and a bracket 2 located at the rear side of the base 1, the left side of the base 1 is provided with a tightening device for detachably connecting to the rolled lithium electrode sheet, and the right side of the base 1 is provided with a telescopic driving device connected to the tightening device and used to control the tightening device to tighten or loosen the rolled lithium electrode sheet, the bracket 2 is equipped with a rotating driving device with a front end supported on the base 1, and the rotating output part of the rotating driving device is fixedly connected to the tightening device, and drives the rolled lithium electrode sheet through the tightening device under the drive of the rotating driving device with adjustable rotation speed. The rolled lithium electrode sheet is rotated and unwound; in the above structure, a tightening device is provided on the left side of the base 1, which is connected to the rotary drive device and whose tightening or loosening state is controlled by the telescopic drive device provided on the right side of the base 1. The lithium electrode sheet to be unwound, which is tightened and fixed on the tightening device under the control of the telescopic drive device, is reliably fixed, and the unwinding action of the lithium electrode sheet is achieved under the drive of the rotary drive device. When the outer diameter of the lithium electrode sheet changes during unwinding, the lithium electrode sheet is ensured to have a stable linear speed, thereby ensuring the surface quality of the lithium electrode sheet during the unwinding process and improving production efficiency. The specific structure of the rotary drive device is as follows: the rotary drive device includes a motor 3, a worm 4 and a worm wheel 5. The motor 3 is installed on the bracket 2, and the output shaft of the motor 3 is connected to the worm 4 supported on the base 1 through a coupling 6. The motor 3 drives the worm 4 to rotate. A hollow shaft 7 arranged horizontally and vertically distributed on the base 1 is rotatably installed, and the worm wheel 5 fixed on the hollow shaft 7 is adapted to be connected to the worm 4, so as to transmit the rotation of the worm 4 to the worm wheels 5 staggered with it. When the worm gear 5 is fixed on the hollow shaft 7, the worm gear 5 is fixed on the hollow shaft 7 and firmly fixed with an external hexagonal nut, and there is no relative axial movement between the worm gear 5 and the hollow shaft 7; the left end of the hollow shaft 7 is fixedly connected to the right end of the expansion sleeve 13 in the expansion device, and the hollow shaft 7 drives the expansion device to rotate synchronously under the drive of the motor 3, thereby driving the expansion device to rotate synchronously under the rotation of the hollow shaft 7, thereby realizing the rotational unwinding of the rolled lithium electrode sheet fixed on the expansion device.

[0017] The specific rotating mounting structure of the worm 4 on the base 1 is as follows: the worm 4, whose lower end passes through the mounting hole on the base 1, is rotatably supported on the base 1 by a bearing seat 8 fixed to the front and rear ends of the base 1. An avoidance groove connected to the mounting hole is formed inside the base 1, and the worm wheel 5 located inside the base 1 engages with the worm 4 through the avoidance groove, thereby ensuring an adaptive connection between the worm wheel 5 and the worm 4 without interference.

[0018] Among them, the base 1 is fixed with a downward extending mounting plate 26 on both the left and right sides, and an L-shaped bracket 27 is fixed on the outer wall of the lower end of the mounting plate 26, so that the base 1 can be fixed in the installation position through the L-shaped bracket 27; similarly, the front wall of the bracket 2 and the front wall of the L-shaped bracket 27 are located on the same plane, which is convenient for fixing in the installation position.

[0019] The specific rotating mounting structure of the hollow shaft 7 on the base 1 is as follows: a horizontal mounting hole is formed on the left end face of the base 1, which penetrates to the right end face and is perpendicularly distributed with the mounting hole for installing the worm 4 thereon, and the mounting hole is connected to the horizontal mounting hole through an avoidance groove. The hollow shaft 7 is rotatably supported on the base 1 by a thrust ball bearing 9 and a deep groove ball bearing 10 installed at the left end of the horizontal mounting hole. The pull rod 11 in the telescopic drive device is adaptively connected to the linear bearings 28 installed at the left and right ends of the horizontal mounting hole respectively. The linear bearings 28 guide the pull rod 11 that moves left and right to ensure that the pull rod 11 moves smoothly and steadily. The left end of the pull rod 11 passes through the center hole of the hollow shaft 7 and is fixedly connected to the expansion head 12 of the conical structure in the expansion device. The left or right movement of the pull rod 11 drives the expansion head to move left or right, thereby realizing that the expansion device expands or loosens the rolled lithium electrode sheet.

[0020] In the above structure, the motor 3 drives the rotating structure of the expansion device through the worm gear 5 and the worm 4, which ensures the stability of the linear speed of the lithium electrode sheet, greatly improves the surface quality of the lithium electrode sheet after unwinding, and improves production efficiency; like Figure 1-8As shown, the specific structure of the expansion device is as follows: the expansion device includes an expansion block 14, an expansion sleeve 13, an expansion tube 15 and an expansion head 12. The expansion sleeve 13 is a stepped sleeve structure composed of a large diameter section at the left end, a small diameter section at the right end, and a connecting ring plate between the large and small diameter sections. The large diameter section at the left end of the expansion sleeve 13 is adapted to fit into the expansion tube 15, and the connecting ring plate on the expansion sleeve 13 is fixedly connected to the right end of the expansion tube 15. The small diameter section at the right end of the expansion sleeve 13 is coaxially fixedly connected to the hollow shaft 7 in the rotary drive device. The hollow shaft 7 drives the expansion sleeve 13 and the expansion tube 15 to rotate synchronously. The expansion sleeve 13 is provided with a conical annular structure with an inner hole formed by connecting the three-petal expansion block 14 through the annular spring 16 at both ends. Grooves are made on the outer circumferential walls of the two ends of the expansion block 14, and the annular spring 16 is adapted to be installed in the groove. The expansion head 12 is located in the conical annular structure formed by the three-petal expansion block 14. The left end of the expansion sleeve 13 is fixed with an end cap 20 located in the expansion tube 15. The large diameter of the expansion sleeve 13 is 20mm. The outer circumferential wall of the segment is uniformly distributed with the same number and position of the expansion block 14 as the Chinese-shaped groove 17, and the two positioning grooves 18 provided on the outer wall of the expansion block 14 respectively correspond to the positions of the two grooves in the Chinese-shaped groove 17 that are perpendicular to the horizontal groove, and the stopper 19 fixed in the two grooves in the Chinese-shaped groove 17 that are perpendicular to the horizontal groove performs radial positioning on the expansion block 14. The expansion tube 15 is an annular structure with long grooves staggered on the inner and outer walls with positioning ring plates at both ends, and the expansion block 14 is arranged on the expansion tube 15. When the tightening head 12 moves leftward or rightward, it extends outward or retracts inward along the horizontal groove of the U-shaped groove 17, thereby loosening or tightening the rolled lithium electrode sheet by the expansion tube 15 with varying diameters. When the tightening head 12 moves leftward, the three-petal expansion block 14 is stretched and moved outward along its radial direction. During this process, the expansion tube 15 is stretched and its diameter increases. When the tightening head 12 moves rightward, the annular spring 16 causes the three-petal expansion block 14 to retract inward and return to its original position. The force acting on the expansion tube 15 disappears, and the expansion tube 15 returns to its original position. like Figure 1-4As shown, the specific structure of the telescopic drive device is as follows: the telescopic drive device includes a cylinder 21 and a pull rod 11, and a side support 22 fixedly connected to the mounting plate 26 is provided on the right side of the base 1, and the cylinder 21 is installed on the right side wall of the side support 22, and the piston rod end of the cylinder 21 is fixedly connected to the coupling 24 fixed to the right end of the pull rod 11 through the shaft sleeve 23, so that the cylinder 21 piston rod drives the pull rod 11 to move left or right when it is extended and retracted, and a positioning ring 25 is fixed on the pull rod 11 arranged inside the base 1 and passing through the mounting plate 26 on the right side, which is located on the outside of the right mounting plate 26 and cooperates with the mounting plate 26 to position the left limit position of the pull rod 11, thereby limiting the left limit position of the pull rod 11, which also has an effect on the expansion The force exerted by the outward expansion of the block 14 on the expansion tube 15 is limited to avoid excessive force affecting the quality of the lithium electrode sheet. The left end of the pull rod 11 passes through the hollow shaft 7 in the rotary drive device and is fixedly connected to the expansion head 12 in the expansion device, and the pull rod 11 drives the expansion head 12 in the expansion device to move left or right under the telescopic control of the piston rod of the cylinder 21; in the above structure, the cylinder 21 controls the expansion device through the pull rod 11 to tighten or loosen the rolled lithium electrode sheet, and the tightness of the expansion tube 15 in the diameter direction is convenient and quick to adjust, which improves the convenience of the expansion action; wherein, the side support 22 adopts a seat structure composed of a side plate and support screws fixed to the four corners of the left side wall of the side plate, and the support screws are fixed to the corresponding side mounting plate 26.

[0021] This technical solution has a novel structural design, is easy and quick to operate, saves time, and reduces costs. The unwinding speed can be adjusted by motor 3 according to demand, eliminating the winding phenomenon, improving the unwinding efficiency of the lithium electrode sheet of the equipment, and has high use value.

[0022] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0023] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Lithium electrode sheet unwinding device, characterized by: The invention comprises a base (1) fixedly connected to the installation position and a bracket (2) located at the rear side of the base (1), wherein the left side of the base (1) is provided with an expansion device for detachably connecting to the rolled lithium electrode sheet, and the right side of the base (1) is provided with a telescopic driving device connected to the expansion device and used to control the expansion device to expand or loosen the rolled lithium electrode sheet, the bracket (2) is provided with a rotating driving device whose front end is supported on the base (1), and the telescopic part of the telescopic driving device that is rolling supported on the base (1) passes through the inner hole of the rotating driving device and is fixedly connected to the expansion head (12) inside the expansion device, the rotating output part of the rotating driving device is fixedly connected to the right end of the expansion part in the expansion device, and the rolled lithium electrode sheet is driven by the expansion device to rotate and unwind through the expansion device under the drive of the rotating driving device with adjustable rotation speed.

2. The lithium electrode sheet unwinding device according to claim 1, characterized in that: The rotary drive device comprises a motor (3), a worm (4) and a worm wheel (5), wherein the motor (3) is mounted on the bracket (2), and the output shaft of the motor (3) is connected to the worm (4) rotatably supported on the base (1) through a coupling (6), a hollow shaft (7) which is horizontally arranged and vertically distributed with the worm (4) is rotatably mounted on the base (1), and the worm wheel (5) fixed on the hollow shaft (7) is adaptively connected to the worm (4), the left end of the hollow shaft (7) is fixedly connected to the right end of the expansion sleeve (13) in the expansion device, and the hollow shaft (7) drives the expansion device to rotate synchronously under the drive of the motor (3).

3. The lithium electrode sheet unwinding device according to claim 2, characterized in that: A worm (4) with its lower end penetrating a mounting hole on the base (1) is rotatably supported on the base (1) via bearing seats (8) fixed to the front and rear ends of the base (1). A relief groove communicating with the mounting hole is formed inside the base (1), and a worm wheel (5) located inside the base (1) engages with the worm (4) through the relief groove.

4. The lithium electrode sheet unwinding device according to claim 3, characterized in that: The base (1) is fixed with downwardly extending mounting plates (26) on both the left and right sides, and an L-shaped bracket (27) is fixed on the outer wall of the lower end of the mounting plate (26).

5. The lithium electrode sheet unwinding device according to claim 4, characterized in that: A horizontal mounting hole is formed on the left end face of the base (1) and extends to the right end face and is vertically distributed with the mounting hole for mounting the worm (4) thereon, and the mounting hole is connected to the horizontal mounting hole through an avoidance groove. The hollow shaft (7) is rotatably supported on the base (1) by a thrust ball bearing (9) and a deep groove ball bearing (10) mounted on the left end of the horizontal mounting hole. The pull rod (11) in the telescopic drive device is adaptively connected to the linear bearings (28) respectively mounted on the left and right ends of the horizontal mounting hole, and the left end of the pull rod (11) passes through the center hole of the hollow shaft (7) and is fixedly connected to the expansion head (12) of the conical structure in the expansion device.

6. The lithium electrode sheet unwinding device according to claim 1, characterized in that: The expansion device comprises an expansion block (14), an expansion sleeve (13), an expansion tube (15) and an expansion head (12), wherein the expansion sleeve (13) is a stepped sleeve structure composed of a large diameter section at the left end, a small diameter section at the right end and a connecting ring plate between the large diameter section and the small diameter section, the large diameter section at the left end of the expansion sleeve (13) is adapted to be inside the expansion tube (15), and the connecting ring plate on the expansion sleeve (13) is fixedly connected to the right end of the expansion tube (15), the small diameter section at the right end of the expansion sleeve (13) is coaxially fixedly connected to the hollow shaft (7) in the rotary drive device, the expansion sleeve (13) is provided with a conical annular structure with an inner hole formed by connecting the three-petal expansion block (14) through annular springs (16) at both ends, and the expansion head (12) is located in the conical annular structure formed by the three-petal expansion block (14), and the left end of the expansion sleeve (13) is fixed with a ring located in the expansion tube ( 15), the outer circumferential wall of the large diameter section of the expansion sleeve (13) is uniformly distributed with the same number and position of the expansion block (14) as the Chinese-shaped groove (17), the two positioning grooves (18) provided on the outer wall of the expansion block (14) respectively correspond to the positions of the two grooves in the Chinese-shaped groove (17) that are perpendicular to the horizontal groove, and the stopper (19) fixed in the two grooves in the Chinese-shaped groove (17) that are perpendicular to the horizontal groove performs radial positioning on the expansion block (14), the expansion tube (15) is an annular structure with long grooves staggeredly distributed on the inner wall and outer wall with positioning ring plates at both ends, and the expansion block (14) extends outward or retracts inward along the horizontal groove of the Chinese-shaped groove (17) when the expansion head (12) moves left or right, so that the rolled lithium electrode sheet is loosened or tightened by the expansion tube (15) with changing diameter.

7. The lithium electrode sheet unwinding device according to any one of claims 1 to 6, characterized in that: The telescopic drive device includes a cylinder (21) and a pull rod (11), a side support (22) fixedly connected to the mounting plate (26) is provided on the right side of the base (1), and the cylinder (21) is installed on the right side wall of the side support (22), the piston rod end of the cylinder (21) is fixedly connected to the coupling 2 (24) fixed to the right end of the pull rod (11) through the shaft sleeve (23), and the pull rod (11) provided inside the base (1) and passing through the right mounting plate (26) is fixed with a positioning ring (25) located on the outside of the right mounting plate (26) and cooperating with the mounting plate (26) to position the pull rod (11) to the extreme position of the left movement, the left end of the pull rod (11) passes through the hollow shaft (7) in the rotary drive device and is fixedly connected to the expansion head (12) in the expansion device, and the pull rod (11) drives the expansion head (12) in the expansion device to move left or right under the telescopic control of the piston rod of the cylinder (21).

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