Winding structure for winding cylindrical battery

Abstract

The utility model discloses a winding structure for winding a cylindrical battery, the winding structure comprises a central tube, the peripheral surface of the central tube forms a winding part, the winding part is connected with a pole piece, and the pole piece is wound on the winding part; and the winding needle is arranged in the central tube in a sleeving manner, and the winding needle is detachably connected with the central tube. According to the winding structure for winding the cylindrical battery, disclosed by the utility model, the winding needle is detachably arranged in the central tube, so that pole group winding and central tube replacing and inserting are combined into one working procedure, a pole group with the central tube tightly attached to a pole piece is directly obtained, and various abnormities occurring in the central tube replacing and inserting process are avoided; the production quality and the production efficiency of the cylindrical battery are improved, wrinkles caused by stress extrusion of the pole piece in the circulation process are prevented, and the circulation and safety performance of a battery cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field especially is related to a winding structure for winding cylindrical battery. BACKGROUND

[0002] The related art points out that the cylindrical lithium ion cell positive and negative pole piece adopts the winding needle to wind the positive pole piece, the diaphragm and the negative pole piece together in the interval mode, usually the winding needle is extracted after winding is completed, and the center tube is inserted in the position of the pole group center hole. The center tube mainly plays the following two roles: (1) the pole piece is supported, the cell will swell and shrink in the cycle charging and discharging process, the center tube can play a certain supporting role to slow down the occurrence of the situation because the steel shell outside the winding core is bound to release the swelling force inwardly, causing the pole piece to be extruded and deformed, causing the pole piece to wrinkle; (2) the gas and heat generated in the cycle process of the cell can be discharged in time.

[0003] At present, the center tube is inserted after winding is completed, a production process is added, the production efficiency is reduced, the diaphragm at the center hole position is prone to loosen, making the center tube difficult to insert, in addition, the inserted center tube rubs with the diaphragm at the center hole position, and the diaphragm is prone to wrinkle; in order to improve the center tube insertion efficiency, a small-diameter center tube must be used, so that the pole group cannot be completely attached and there is a certain gap, and the pole piece is still prone to wrinkle in the cycle process, which seriously affects the cycle performance and even the safety performance of the cell. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a winding structure for winding a cylindrical battery, which can improve the production quality and production efficiency of the cylindrical battery.

[0005] The winding structure for winding a cylindrical battery according to the utility model comprises a center tube, the outer circumferential surface of the center tube is formed into a winding part, the winding part is connected with a pole piece, and the pole piece is wound on the winding part; and a winding needle, which is sleeved in the center tube and is detachably connected with the center tube.

[0006] The winding structure for winding a cylindrical battery according to the utility model has the advantages that the winding needle is detachably arranged in the center tube, the pole group winding and the center tube replacement are combined into one process, the pole group with the center tube closely attached is directly obtained, various abnormalities in the center tube replacement process are avoided, the production quality and production efficiency of the cylindrical battery are improved, the pole piece wrinkle caused by stress extrusion in the cycle process is prevented, and the cycle and safety performance of the cell are improved.

[0007] In some embodiments, the peripheral wall of the center tube is formed with a first matching part, the peripheral wall of the winding needle is formed with a second matching part, and the winding needle is detachably connected with the center tube through the first matching part and the second matching part.

[0008] Further, the first matching part is formed as a through hole, the second matching part is formed as a protrusion, the protrusion is movable in the radial direction of the winding needle, and the winding needle is detachably connected with the center tube through the through hole and the protrusion.

[0009] Further, the winding needle is provided with an elastic member connected with the protrusion to make the protrusion movable in the radial direction of the winding needle.

[0010] Further, the protrusion includes a plurality of protrusions arranged in the circumferential and axial directions of the winding needle, the through hole includes a plurality of through holes arranged in the circumferential and axial directions of the center tube, and the plurality of protrusions are arranged one by one with the plurality of through holes.

[0011] In other embodiments, the first matching part is formed as a first thread, the second matching part is formed as a second thread, and the winding needle is detachably connected with the center tube through the engagement of the first thread and the second thread.

[0012] Further, the first thread is formed on the inner peripheral wall of the center tube, the second thread is formed on the outer peripheral wall of the winding needle, and the rotation direction of the winding needle into the center tube is the same as the winding direction of the pole piece.

[0013] In yet other embodiments, the first matching part is formed as a clamping groove, the clamping groove is inclinedly extended from one end of the center tube along the inner peripheral wall of the center tube in the axial direction of the center tube, the second matching part is formed as a clamping protrusion, and the winding needle is detachably connected with the center tube through the clamping groove and the clamping protrusion.

[0014] Further, the inclined extension direction of the clamping groove is the same as the winding direction of the pole piece.

[0015] Further, the clamping groove includes two clamping grooves oppositely arranged in the radial direction of the center tube, the clamping protrusion includes two clamping protrusions oppositely arranged in the radial direction of the winding needle, and the two clamping protrusions are arranged one by one with the two clamping grooves.

[0016] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 This is a schematic diagram of the central tube according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A schematic cross-sectional view of the central tube shown;

[0019] Figure 3 yes Figure 1 A top view of the central tube shown;

[0020] Figure 4 Is with Figure 1 A schematic diagram of a coiling needle fitted with a central tube is shown.

[0021] Figure 5 yes Figure 4 A schematic cross-sectional view of the coiling needle shown;

[0022] Figure 6 yes Figure 4 A top view of the coiling needle shown;

[0023] Figure 7 This is a schematic diagram of the central tube according to another embodiment of the present invention;

[0024] Figure 8 yes Figure 7 A schematic cross-sectional view of the central tube shown;

[0025] Figure 9 yes Figure 7 A top view of the central tube shown;

[0026] Figure 10 Is with Figure 7 A schematic diagram of a coiling needle fitted with a central tube is shown.

[0027] Figure 11 yes Figure 10 A schematic cross-sectional view of the coiling needle shown;

[0028] Figure 12 yes Figure 10 A top view of the coiling needle shown;

[0029] Figure 13 This is a schematic diagram of the central tube according to another embodiment of the present invention;

[0030] Figure 14 yes Figure 13 A schematic cross-sectional view of the central tube shown;

[0031] Figure 15 yes Figure 13 A top view of the central tube shown;

[0032] Figure 16 Is with Figure 13 A schematic diagram of a coiling needle fitted with a central tube is shown.

[0033] Figure 17 yes Figure 16 A schematic cross-sectional view of the coiling needle shown;

[0034] Figure 18 yes Figure 16 The diagram shows a top view of the coiling needle.

[0035] Figure label:

[0036] 1. Central tube; 11. Through hole; 12. First thread; 13. Slot;

[0037] 2. Coiling needle; 21. Protrusion; 22. Second thread; 23. Locking protrusion. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0039] The following is for reference. Figures 1-16 This invention describes a winding structure for winding cylindrical batteries according to an embodiment of the present invention.

[0040] like Figures 1-16 As shown, the winding structure for winding a cylindrical battery according to an embodiment of the present invention includes: a central tube 1 and a winding needle 2.

[0041] Specifically, the outer peripheral surface of the central tube 1 is formed as a winding section, which is connected to the electrode sheet. The electrode sheet is wound on the winding section, and the winding needle 2 is sleeved inside the central tube 1 and is detachably connected to the central tube 1. It can be understood that the winding section on the outer peripheral surface of the central tube 1 is used to carry and guide the positive electrode sheet, negative electrode sheet, and separator to be wound in a predetermined manner. The central tube 1 is hollow to facilitate the installation of the winding needle 2. The winding needle 2 is inserted into the interior of the central tube 1 and is connected to the winding equipment to drive the central tube 1 to rotate, thereby winding the positive electrode sheet, negative electrode sheet, and separator onto the central tube 1. After the winding is completed, the winding needle 2 can be easily removed from the central tube 1, leaving the wound battery cell.

[0042] When winding the cylindrical battery, first, a layer of diaphragm is placed on the center tube 1, and then the positive plate, diaphragm, negative plate and other materials are stacked in turn, the layered materials are uniformly wound at a set speed and tension by the winding needle 2, the winding is stopped when the required thickness is reached, the winding needle 2 is removed, and the remaining is a cylindrical structure with electrode materials, and finally the wound battery is packaged into a shell.

[0043] It should be known that the currently used center tube 1 is mostly inserted after winding is completed, which increases a production process and reduces production efficiency, the diaphragm at the center hole position is prone to loosen, so that the center tube 1 is difficult to insert; in addition, the inserted center tube 1 rubs with the diaphragm at the center hole position, which is prone to wrinkle the diaphragm; in order to improve the insertion efficiency of the center tube 1, a small-diameter center tube 1 must be used, so that the center tube 1 cannot completely fit with the pole group and there is a certain gap, and the pole plate is still prone to wrinkle in the circulation process, which seriously affects the cycle performance and even the safety performance of the battery.

[0044] According to the winding structure for winding the cylindrical battery, the winding needle 2 is detachably arranged in the center tube 1, so that the pole group winding and the center tube 1 replacement are combined into one process, the pole group with the center tube 1 closely fitted is directly obtained, various abnormalities in the process of replacing the center tube 1 are avoided, the production quality and production efficiency of the cylindrical battery are improved, the wrinkle of the pole plate due to stress extrusion in the circulation process is prevented, and the cycle and safety performance of the battery are improved.

[0045] In addition, the winding structure of the embodiment of the present application improves the defects while retaining the air guiding and heat conducting functions of the center tube 1, so that the generated gas and heat of the battery can be discharged in time, and the safety performance of the cylindrical battery is ensured.

[0046] Further, the peripheral wall of the center tube 1 is formed with a first matching part, the peripheral wall of the winding needle 2 is formed with a second matching part, and the winding needle 2 is detachably connected with the center tube 1 through the first matching part and the second matching part. That is, the first matching part and the second matching part form a detachable but stable connection between the center tube 1 and the winding needle 2, so as to ensure that the winding needle 2 can stably support the material during the winding of the pole plate, and the winding needle 2 can be easily taken out after the winding is completed, thereby simplifying the production process of the cylindrical battery, improving the production efficiency, and ensuring the quality of the final product.

[0047] In some embodiments of the present application, for example, Figures 1-6As shown, the first matching part is formed as a through hole 11, and the second matching part is formed as a protrusion 21, the protrusion 21 is movable in the radial direction of the winder 2, and the winder 2 is detachably connected with the center tube 1 through the matching of the through hole 11 and the protrusion 21. It can be understood that the through hole 11 provides a positioning point for the protrusion 21 on the winder 2, when the winder 2 is inserted into the center tube 1, the protrusion 21 passes through the corresponding through hole 11 and locks the position, and the protrusion 21 moves in the radial direction of the winder 2, so that the protrusion 21 can be compressed or bent to pass through the through hole 11 of the center tube 1 and restore after passing through, thereby fixing the winder 2.

[0048] Further, the winder 2 is provided with an elastic member, the elastic member is connected with the protrusion 21 to make the protrusion 21 movable in the radial direction of the winder 2. It can be understood that, in the process of inserting the winder 2 into the center tube 1, the winder 2 is aligned with the center tube 1, when the protrusion 21 of the winder 2 contacts the inner wall of the center tube 1 and exerts a certain force, at this time the protrusion 21 on the winder 2 is displaced by the pressure of the inner wall of the center tube 1, so that the elastic member is compressed and deformed, once the protrusion 21 completely passes through the through hole 11, the elastic member pushes the protrusion 21 to move outward, so that it is clamped into the through hole 11, forming a stable connection; in the process of pulling out the winder 2 from the center tube 1, a certain pressure is applied to the protrusion 21 towards the winder 2, so that the protrusion 21 retreats into the winder 2, at this time the winder 2 can be smoothly pulled out from the center tube 1.

[0049] In some embodiments, the protrusion 21 includes a plurality of protrusions 21, the plurality of protrusions 21 are arranged in the circumferential and axial directions of the winder 2, the through hole 11 includes a plurality of through holes 11, the plurality of through holes 11 are arranged in the circumferential and axial directions of the center tube 1, and the plurality of protrusions 21 are arranged one by one with the plurality of through holes 11. Therefore, the multi-point connection makes the connection between the winder 2 and the center tube 1 more stable, reduces the risk of single-point failure, avoids local stress concentration, and enhances the reliability and durability of the winding structure.

[0050] In a specific embodiment, the center tube 1 is a hollow cylinder with an outer diameter of 4-6 mm and an inner diameter of 3-5 mm, the outer peripheral wall is distributed with circular (also triangular, square, semicircular, pentagonal, etc.) through holes 11 every 90°, and the number of through holes 11 is 8-36. The outer peripheral wall of the matched winder 2 is formed with protrusions 21, the distribution of the protrusions 21 corresponds to the number and shape of the through holes 11 on the center tube 1, the diameter of the winder 2 is about 2.5-4.5 mm, and the built-in elastic member can control the extension and contraction of the protrusions 21.

[0051] In addition, the through hole 11 of the center tube 1 after liquid injection can also be used as an electrolyte flow channel to improve the electrolyte infiltration speed and improve the liquid injection efficiency.

[0052] In other embodiments of the present application, as Figures 7-12As shown, the first fitting part is formed as a first thread 12, and the second fitting part is formed as a second thread 22, and the needle 2 is detachably connected with the center tube 1 through the engagement of the first thread 12 and the second thread 22. It can be understood that the first thread 12 on the center tube 1 matches the second thread 22 on the needle 2, and in the process of inserting the needle 2 into the center tube 1, the needle 2 is aligned with the threaded opening of the center tube 1, and the needle 2 is rotated to make the first thread 12 engage with the second thread 22, and is rotated to a predetermined depth or position, and once the needle 2 is screwed into the center tube 1 and reaches the appropriate position, the friction and mechanical engagement force between the threads will ensure that the needle 2 is firmly fixed in the center tube 1, and this threaded connection provides a very stable connection, which can remain stable even under high-speed rotation or under a large radial force; in the process of withdrawing the needle 2 from the center tube 1, it is only necessary to reverse the rotation of the needle 2 to gradually disengage the second thread 22 from the first thread 12 until the needle 2 is completely withdrawn from the center tube 1, which is simple and convenient to operate.

[0053] Specifically, the first thread 12 is formed on the inner circumferential wall of the center tube 1, and the second thread 22 is formed on the outer circumferential wall of the needle 2, and the rotation direction of the needle 2 into the center tube 1 is the same as the winding direction of the pole piece. Thus, the threaded connection provides good anti-loosening performance, reduces the risk of loosening caused by reverse force, improves the stability and reliability of the winding structure, and the threaded connection is simple to assemble and easy to operate.

[0054] In a specific embodiment, the center tube 1 is a hollow cylinder with an outer diameter of 4-6 mm and an inner diameter of 3-5 mm, and the inner circumferential wall is formed with the first thread 12, and the outer circumferential wall of the matched needle 2 is formed with the second thread 22, and the diameter of the needle 2 is about 2.5-4.5 mm.

[0055] In still other embodiments of the present application, as shown in Figures 13-18 As shown, the first fitting part is formed as a first thread 12, and the second fitting part is formed as a second thread 22, and the needle 2 is detachably connected with the center tube 1 through the engagement of the first thread 12 and the second thread 22. It can be understood that the first thread 12 on the center tube 1 matches the second thread 22 on the needle 2, and in the process of inserting the needle 2 into the center tube 1, the needle 2 is aligned with the threaded opening of the center tube 1, and the needle 2 is rotated to make the first thread 12 engage with the second thread 22, and is rotated to a predetermined depth or position, and once the needle 2 is screwed into the center tube 1 and reaches the appropriate position, the friction and mechanical engagement force between the threads will ensure that the needle 2 is firmly fixed in the center tube 1, and this threaded connection provides a very stable connection, which can remain stable even under high-speed rotation or under a large radial force; in the process of withdrawing the needle 2 from the center tube 1, it is only necessary to reverse the rotation of the needle 2 to gradually disengage the second thread 22 from the first thread 12 until the needle 2 is completely withdrawn from the center tube 1, which is simple and convenient to operate.

[0056] Specifically, the inclined extension direction of the clamping groove 13 is the same as the winding direction of the pole piece. Thus, good anti-loosening performance is provided, the loosening risk caused by the reverse force is reduced, the stability and reliability of the winding structure are improved, and the assembly method is simple and easy to operate.

[0057] In some embodiments, as shown in Figure 15 and 18 The clamping groove 13 includes two, the two clamping grooves 13 are oppositely arranged in the radial direction of the central tube 1, the clamping protrusion 23 includes two, the two clamping protrusions 23 are oppositely arranged in the radial direction of the winding needle 2, and the two clamping protrusions 23 are arranged one by one with the two clamping grooves 13. Thus, the stability and reliability of the connection are further enhanced, the risk of single-point failure is reduced, and the stability of the entire winding structure is improved.

[0058] In a specific embodiment, the central tube 1 is a hollow cylinder with an outer diameter of 4-6 mm and an inner diameter of 3-5 mm, and the inclined clamping grooves 13 are formed on the inner wall of the central tube 1. The inner end of the clamping groove 13 is formed with a triangular (which can also be circular, semicircular, etc.) buckle, and the two clamping grooves 13 are spaced apart by 180° (which can also be a groove and a buckle). The matching winding needle 2 is a steel needle with a diameter of about 2.5-4.5 mm, and the surface is distributed with two clamping protrusions 23 of the same shape as the buckle.

[0059] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0060] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0061] In the utility model, unless another definite provision and limitation, the term " install " " link " " connect " " fixed " and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection, also can be communication;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element internal communication or two element's mutual action relationship. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0062] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0063] Although the embodiments of the present utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A winding structure for winding a cylindrical battery, characterized by, The application relates to a winding needle and a center tube. The center tube is provided with a first matching part, and the winding needle is provided with a second matching part; the winding needle is detachably connected with the center tube through the first matching part and the second matching part. The first matching part is formed as a through hole, and the second matching part is formed as a protrusion; the protrusion is movable in the radial direction of the winding needle; and the winding needle is detachably connected with the center tube through the through hole and the protrusion.

2. The winding structure according to claim 1, characterized in that, The winding needle is provided with an elastic member connected with the protrusion to enable the protrusion to move in the radial direction of the winding needle.

3. The winding structure according to claim 2, characterized in that, The protrusion comprises a plurality of protrusions arranged in the circumferential and axial directions of the winding needle; the through hole comprises a plurality of through holes arranged in the circumferential and axial directions of the center tube; and the plurality of protrusions are arranged one by one with the plurality of through holes.

4. The winding structure according to claim 3, characterized in that The first matching part is formed as a first thread, and the second matching part is formed as a second thread; the winding needle is detachably connected with the center tube through the engagement of the first thread and the second thread.

5. The winding structure according to claim 4, characterized in that The first thread is formed on the inner circumferential wall of the center tube, and the second thread is formed on the outer circumferential wall of the winding needle; and the rotation direction of the winding needle into the center tube is the same as the winding direction of the pole piece.

6. The winding structure according to claim 2, characterized in that, The first matching part is formed as a clamping groove, which is inclinedly extended from one end of the center tube along the inner circumferential wall of the center tube in the axial direction of the center tube; the second matching part is formed as a clamping protrusion; and the winding needle is detachably connected with the center tube through the clamping groove and the clamping protrusion.

7. The winding structure according to claim 6, characterized in that The inclined extension direction of the clamping groove is the same as the winding direction of the pole piece.

8. The winding structure according to claim 2, characterized in that, The clamping groove comprises two clamping grooves arranged oppositely in the radial direction of the center tube; the clamping protrusion comprises two clamping protrusions arranged oppositely in the radial direction of the winding needle; and the two clamping protrusions are arranged one by one with the two clamping grooves.

9. The winding structure according to claim 8, characterized in that ​ 10. The winding structure according to claim 9, characterized in that ​

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