Lithium battery winding needle

Abstract

The present invention discloses a lithium battery winding needle, in which a first arc-shaped cylinder, a second arc-shaped cylinder, a third arc-shaped cylinder and a fourth arc-shaped cylinder are surrounded in sequence to form a cylindrical hollow chamber structure, the first arc-shaped cylinder and the second arc-shaped cylinder are hingedly connected through a first hinge connection point, the second arc-shaped cylinder and the third arc-shaped cylinder are hingedly connected through a second hinge connection point, the third arc-shaped cylinder and the fourth arc-shaped cylinder are hingedly connected through a third hinge connection point, and the fourth arc-shaped cylinder and the first arc-shaped cylinder are hingedly connected through a fourth hinge connection point, and a first separator clip and a second separator clip are installed in the cylindrical hollow chamber structure. The technical effect achieved is that the lithium battery winding needle of the present invention solves the problem in the prior art that it is difficult to control the change in the tension magnitude when winding the electrode plate and separator around the winding needle, thereby significantly improving the processing efficiency and quality and greatly reducing the processing cost.

Description

Technical Field

[0001] <Cross - reference to Related Applications> This application claims the priority of a Chinese patent application with application number CN202110707227.X and application title "Lithium Battery Winding Needle" filed with the Chinese Patent Office on June 24, 2021, and a Chinese patent application with application number CN202110814283.3 and application title "Lithium Battery Winding Needle" filed with the Chinese Patent Office on July 19, 2021, and all of its content is incorporated herein by reference.

[0002] The present invention relates to the technical field of lithium battery manufacturing, specifically to a lithium battery winding needle, specifically a winding needle for a rectangular lithium battery winding machine.

Background Art

[0003] In the prior art, the winding needle in a rectangular lithium battery winding machine is in the shape of a shuttle. When winding the electrode plate and the separator around the winding needle, it is difficult to control the change in the magnitude of the tension, which affects the efficiency and quality.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, the present invention provides a lithium battery winding needle for solving the above problems in the prior art.

Means for Solving the Problems

[0005] To achieve the above object, the present invention provides the following technical solutions.

[0006] According to the first aspect of the present invention, there is provided a lithium battery winding needle, which includes a first arc-shaped cylinder, a second arc-shaped cylinder, a third arc-shaped cylinder, a fourth arc-shaped cylinder, a first hinge connection point, a second hinge connection point, a third hinge connection point, a fourth hinge connection point, a first separator clip and a second separator clip. The first arc-shaped cylinder, the second arc-shaped cylinder, the third arc-shaped cylinder and the fourth arc-shaped cylinder are surrounded in sequence to form a cylindrical hollow chamber structure. Between the first arc-shaped cylinder and the second arc-shaped cylinder, they are hinge-connected via the first hinge connection point. Between the second arc-shaped cylinder and the third arc-shaped cylinder, they are hinge-connected via the second hinge connection point. Between the third arc-shaped cylinder and the fourth arc-shaped cylinder, they are hinge-connected via the third hinge connection point. Between the fourth arc-shaped cylinder and the first arc-shaped cylinder, they are hinge-connected via the fourth hinge connection point. Inside the cylindrical hollow chamber structure, the first separator clip and the second separator clip are installed.

[0007] Furthermore, during the winding operation, a separator is inserted between the first separator clip and the second separator clip.

[0008] Furthermore, the first separator clip is fixed inside the fourth arc-shaped cylinder, and the second separator clip is fixed inside the first arc-shaped cylinder.

[0009] Furthermore, the first arc-shaped cylinder, the second arc-shaped cylinder, the third arc-shaped cylinder and the fourth arc-shaped cylinder have the same radius of the arc surface, and the outer arc surface is a part of the outer peripheral side surface of the cylinder. In addition, the first arc-shaped cylinder, the second arc-shaped cylinder, the third arc-shaped cylinder and the fourth arc-shaped cylinder may have any other structural form.

[0010] Furthermore, the battery core is wound around the entire outer peripheral side surrounded by the first arc-shaped cylinder, the second arc-shaped cylinder, the third arc-shaped cylinder and the fourth arc-shaped cylinder.

[0011] Furthermore, the second hinge connection point is a first open hinge.

[0012] Furthermore, the fourth hinge connection point is a second open hinge.

[0013] Furthermore, it further includes an elastic body, and the elastic body is sleeved on the entire outer peripheral side surrounded by the first arc-shaped column, the second arc-shaped column, the third arc-shaped column, and the fourth arc-shaped column.

[0014] Furthermore, the elastic body is an annular tension spring, a rubber ring, or other annular structures having elasticity.

[0015] Furthermore, the chamber cross-section within the cylindrical hollow chamber structure sequentially surrounded by the first arc-shaped column, the second arc-shaped column, the third arc-shaped column, and the fourth arc-shaped column is an equilateral quadrilateral.

[0016] Furthermore, it further includes a winding needle handle and a cylinder. Support rods are installed at all of the first hinge connection point, the second hinge connection point, the third hinge connection point, and the fourth hinge connection point. Guide grooves are opened on the winding needle handle and are installed opposite to each other. Here, the support rods installed at two diagonals are respectively inserted slidably into the guide grooves. The fixed end of the cylinder is attached to one of the support rods, and the end of the telescopic rod of the cylinder is attached to the other support rod.

Advantages of the Invention

[0017] The present invention has the following advantages. With the lithium battery winding needle of the present invention, it is possible to solve the problem in the prior art that it is difficult to control the change in the magnitude of the tension when winding the electrode plate and the separator around the winding needle, significantly improving the processing efficiency and quality, and greatly reducing the processing cost.

Brief Description of the Drawings

[0018] To more clearly explain the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and those skilled in the art can obtain other implementation drawings based on the provided drawings on the premise of not paying creative labor.

[0019] The structures, ratios, sizes, etc. depicted in this specification are all used only to conform to the content disclosed in the specification for those who are proficient in this technology to understand and view, and are not for limiting the limited conditions for the implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the ratio relationship, or adjustment of the size should be included within the scope that can be covered by the technical content disclosed in the present invention without affecting the achievable effects and purposes of the present invention.

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Embodiments for Carrying out the Invention

[0020] The following describes the embodiments of the present invention by specific specific examples. Those skilled in this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0021] As shown in FIGS. 1 to 5, a lithium battery winding needle according to an embodiment of the first aspect of the present invention includes a first arc-shaped cylinder 11, a second arc-shaped cylinder 12, a third arc-shaped cylinder 13, a fourth arc-shaped cylinder 14, a first hinge connection point 21, a second hinge connection point 22, a third hinge connection point 23, a fourth hinge connection point 24, a first separator clip 31 and a second separator clip 32. The first arc-shaped cylinder 11, the second arc-shaped cylinder 12, the third arc-shaped cylinder 13 and the fourth arc-shaped cylinder 14 are surrounded in sequence to form a cylindrical hollow chamber structure. Between the first arc-shaped cylinder 11 and the second arc-shaped cylinder 12, they are hinge-connected via the first hinge connection point 21. Between the second arc-shaped cylinder 12 and the third arc-shaped cylinder 13, they are hinge-connected via the second hinge connection point 22. Between the third arc-shaped cylinder 13 and the fourth arc-shaped cylinder 14, they are hinge-connected via the third hinge connection point 23. Between the fourth arc-shaped cylinder 14 and the first arc-shaped cylinder 11, they are hinge-connected via the fourth hinge connection point 24. Inside the cylindrical hollow chamber structure, the first separator clip 31 and the second separator clip 32 are installed.

[0022] In the above embodiment, it should be noted that the first arc-shaped column body 11, the second arc-shaped column body 12, the third arc-shaped column body 13, and the fourth arc-shaped column body 14 have the same radius of the arc surface, and they are part of the surface of the cylindrical body. The first hinge connection point 21, the second hinge connection point 22, the third hinge connection point 23, and the fourth hinge connection point 24 are closed hinges, and 22a and 24a are open hinges.

[0023] The technical effect achieved by the above embodiment is that the lithium battery winding needle of this embodiment can solve the problem in the prior art that it is difficult to control the change in the magnitude of the tension when winding the electrode plate and the separator around the winding needle, significantly improving the processing efficiency and quality, and greatly reducing the processing cost.

[0024] Optionally, as shown in FIGS. 1 to 5, in some embodiments, during the winding operation, when the winding needle hinge connection points 22 and 24 (22a, 24a) approach the center of the circle, the first separator clip 31 and the second separator clip 32 open, and the separator 5 is inserted therebetween. When the winding needle is circular, the first separator clip 31 and the second separator clip 32 clamp the separator 5, the electrode plate is inserted, and the winding needle starts to rotate.

[0025] Optionally, as shown in FIGS. 1 to 5, in some embodiments, the first separator clip 31 is fixed within the fourth arc-shaped column body 14, and the second separator clip 32 is fixed within the first arc-shaped column body 11.

[0026] Optionally, as shown in FIGS. 1 to 5, in some embodiments, the first arc-shaped column body 11, the second arc-shaped column body 12, the third arc-shaped column body 13, and the fourth arc-shaped column body 14 have the same radius of the arc surface, and the outer arc surface is part of the outer peripheral side surface of the cylindrical body. In addition, the first arc-shaped column body 11, the second arc-shaped column body 12, the third arc-shaped column body 13, and the fourth arc-shaped column body 14 may have any other structural form.

[0027] Optionally, as shown in FIGS. 1 to 5, in some embodiments, the battery core 4 is wound around the entire outer peripheral side surrounded by the first arc-shaped column 11, the second arc-shaped column 12, the third arc-shaped column 13, and the fourth arc-shaped column 14.

[0028] In the above optional embodiment, it should be noted that here, the battery core 4 is formed by laminating and winding a battery positive electrode plate, a separator, a negative electrode plate, and a separator.

[0029] Optionally, as shown in FIGS. 1 to 5, in some embodiments, the second hinge connection point 22 is the first open hinge 22a.

[0030] Optionally, as shown in FIGS. 1 to 5, in some embodiments, the fourth hinge connection point 24 is the second open hinge 24a.

[0031] Optionally, as shown in FIGS. 1 to 5, in some embodiments, further including an elastic body 6, the elastic body 6 is sleeved on the entire outer peripheral side surrounded by the first arc-shaped column 11, the second arc-shaped column 12, the third arc-shaped column 13, and the fourth arc-shaped column 14.

[0032] Optionally, as shown in FIGS. 1 to 5, in some embodiments, the elastic body 6 is an annular tension spring, a rubber ring, or other annular structures having elasticity.

[0033] Optionally, as shown in FIGS. 1 to 5, in some embodiments, the first arc-shaped column 11, the second arc-shaped column 12, the third arc-shaped column 13, and the fourth arc-shaped column 14 are surrounded in a cylindrical shape in sequence and have a hollow chamber structure.

[0034] Optionally, it further includes a take-up needle handle 9 and a cylinder 8. Support rods 7 are installed at all of the first hinge connection point 21, the second hinge connection point 22, the third hinge connection point 23, and the fourth hinge connection point 24. Guide grooves 10 are provided oppositely on the take-up needle handle 9. Here, the support rods 7 installed at two diagonals are slidably inserted into the guide grooves 10 respectively. The fixed end of the cylinder 8 is attached to one of the support rods 7, and the end of the telescopic rod of the cylinder 8 is attached to the other support rod 7.

[0035] The technical effect achieved by the above embodiment is to realize the winding and extraction operations of the battery core of the entire device by adopting the cylinder 8 to drive.

[0036] The lithium battery take-up needle of the present application can solve the above problems in the background technology. When winding the electrode plate and the separator 5 around the take-up needle, the take-up needle is circular, with no tension fluctuation. After winding is completed, under the action of an external force, the take-up needle changes, and the battery core is changed into a shuttle shape. The lithium battery take-up needle is composed of four arc-shaped cylinders with equal radii hinged to each other. When the centers of the four arc surfaces of the first arc-shaped cylinder 11, the second arc-shaped cylinder 12, the third arc-shaped cylinder 13, and the fourth arc-shaped cylinder 14 overlap, the take-up needle is circular, and the wound battery core is also circular. Under the action of an external force, when the two hinge connection points 23, 21 corresponding to the take-up needle move away from the center (or one hinge connection point moves away from the center and the other hinge connection point does not move), and the other two hinge connection points 22, 24 (22a, 24a) approach the center, in this way, the diameter direction of the battery core is stretched, presenting a shuttle shape. When the manipulator removes and shapes the battery core, the required rectangular battery is obtained.

[0037] The embodiments of the above examples are as follows. That is, the take-up needle in FIG. 1 is connected to the rotating shaft of the take-up machine via a mechanism, and is concentric with the rotating shaft when the take-up needle assumes a cylindrical shape. This mechanism separates the first hinge connection point 21 and the third hinge connection point 23, which are hinge connection points, from the center of the circle (or one of them moves away while the other does not move), and brings the second hinge connection point 22 and the fourth hinge connection point 24 closer to the center of the circle. At the same time, after the two separator clips, the first separator clip 31 and the second separator clip 32, are opened and the separator 5 is inserted, this mechanism brings the first hinge connection point 21 and the third hinge connection point 23, which are hinge connection points, closer to the center of the circle. When the arc surfaces of the four first arc-shaped cylinders 11, second arc-shaped cylinders 12, third arc-shaped cylinders 13, and fourth arc-shaped cylinders 14 are concentric, the first separator clip 31 and the second separator clip 32 already clamp the separator 5. When the positive and negative plates are inserted into the separator 5, winding starts. At this time, there is no change in tension, the winding speed can be increased, the quality of the battery core is also good. When winding is completed, the separator is cut and the separator 5 is fixed with tape, and the winding of the circular battery core is completed. When taking out the battery core, the mechanism separates the first hinge connection point 21 and the third hinge connection point 23 from the center of the circle (or one of them moves away while the other does not move), and brings the second hinge connection point 22 and the fourth hinge connection point 24 closer to the center of the circle. At the same time, the first separator clip 31 and the second separator clip 32 are opened, and the battery core becomes shuttle-shaped by the take-up needle at this time. After the take-up needle is deformed, the inner circumference of the battery core becomes larger than the length of contact between the take-up needle and the battery core, and the manipulator can take out the battery core smoothly. After shaping, it becomes a square battery. FIG. 5 is for winding a small rectangular battery take-up needle. The first open hinge 22a and the second open hinge 24a are open hinges, and their designs are such that the closer they are to the center of the circle, the easier it is to take out the battery core from the take-up needle. The annular elastic body 6 applies a force to prevent the opening and closing of the open hinge from coming off.

[0038] The above has already described the present invention in detail using general descriptions and specific examples. However, based on the present invention, several modifications or improvements can be made thereto, which are obvious to those skilled in the art. Therefore, any of these modifications or improvements made without departing from the spirit of the present invention shall fall within the scope of protection required by the present invention.

[0039] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are also for the convenience of description and are not for limiting the scope of implementation of the present invention. Even if there are changes or adjustments in their relative relationships, when the technical content is not substantially changed, they should be regarded as within the scope of implementation of the present invention.

Explanation of Reference Signs

[0040] 11. First arc-shaped column 12. Second arc-shaped column 13. Third arc-shaped column 14. Fourth arc-shaped column 21. First hinge connection point 22. Second hinge connection point 23. Third hinge connection point 24. Fourth hinge connection point 22a. First open hinge 24a. Second open hinge 31. First separator clip 32. Second separator clip 4. Battery core 5. Separator 6. Elastic body 7. Support rod 8. Cylinder 9. Winding needle handle 10. Guide groove

Claims

**Claim 1** A lithium battery winding needle, comprising a first arc-shaped cylinder (11), a second arc-shaped cylinder (12), a third arc-shaped cylinder (13), a fourth arc-shaped cylinder (14), a first hinge connection point (21), a second hinge connection point (22), a third hinge connection point (23), a fourth hinge connection point (24), a first separator clip (31) and a second separator clip (32), wherein the first arc-shaped cylinder (11), the second arc-shaped cylinder (12), the third arc-shaped cylinder (13) and the fourth arc-shaped cylinder (14) are surrounded in sequence to form a cylindrical hollow chamber structure, and between the first arc-shaped cylinder (11) and the second arc-shaped cylinder (12) is hinge-connected via the first hinge connection point (21), between the second arc-shaped cylinder (12) and the third arc-shaped cylinder (13) is hinge-connected via the second hinge connection point (22), between the third arc-shaped cylinder (13) and the fourth arc-shaped cylinder (14) is hinge-connected via the third hinge connection point (23), between the fourth arc-shaped cylinder (14) and the first arc-shaped cylinder (11) is hinge-connected via the fourth hinge connection point (24), and within the cylindrical hollow chamber structure, the first separator clip (31) and the second separator clip (32) are installed. The first separator clip (31) is fixed within the fourth arc-shaped cylinder (14), and the second separator clip (32) is fixed within the first arc-shaped cylinder (11). A lithium battery winding needle characterized by this. **Claim 2** The first arc-shaped cylinder (11), the second arc-shaped cylinder (12), the third arc-shaped cylinder (13) and the fourth arc-shaped cylinder (14) have the same radius of the arc surface, and the outer arc surface is a part of the outer peripheral side surface of the cylinder. The lithium battery winding needle according to Claim 1, characterized by this. **Claim 3** The second hinge connection point (22) is a first open hinge (22a). The lithium battery winding needle according to Claim 1, characterized by this. **Claim 4** The fourth hinge connection point (24) is a second open hinge (24a). The lithium battery winding needle according to Claim 3, characterized by this. **Claim 5** Further comprising an elastic body (6), the elastic body (6) is sleeved on the entire outer peripheral side surrounded by the first arc-shaped cylinder (11), the second arc-shaped cylinder (12), the third arc-shaped cylinder (13) and the fourth arc-shaped cylinder (14). The lithium battery winding needle according to claim 4, characterized in that.

6. The lithium battery winding needle according to claim 5, characterized in that the elastic body (6) is an annular tension spring or a rubber ring.

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