Battery cell hole ironing device and lithium battery winding machine

Abstract

The utility model is suitable for the field of lithium ion battery preparation, and provides a cell hole ironing device and a lithium battery winding machine. The battery cell hole ironing device comprises an ironing needle which extends along a first direction, and the front end of the ironing needle along the first direction is in a cone shape with the section diameter decreasing progressively; the clamping structure is used for clamping the battery cell and enabling a central hole of the battery cell to be coaxial with the ironing needle; the heating structure is used for heating the ironing needle; the driving structure is used for driving the ironing needle to move back and forth along the first direction; and after the ironing needle is heated by the heating structure, the driving structure drives the ironing needle to extend into the central hole of the battery cell so as to iron the battery cell to be round. According to the battery cell hole ironing device provided by the invention, the diaphragm shaping quality can be improved.

Description

Technical Field

[0001] The present application belongs to the field of lithium-ion battery preparation, and in particular relates to a battery core punching device and a lithium battery winding machine. Background Art

[0002] Please refer to Figure 1 The cylindrical battery cell 50 is formed by winding. After forming, there is often a section of diaphragm 51 across the center hole 501 of the battery cell 50. During the welding process of the wound battery cell 50 and the bottom of the battery shell, the welding needle needs to pass through the center hole 501 of the battery cell 50, or a conductive needle needs to be inserted into the center hole 501 as needed. At this time, the welding needle or conductive needle inserted into the center hole is very likely to damage the diaphragm 51 and cause an internal resistance short circuit. Therefore, after the battery cell 50 is wound, the diaphragm 51 needs to be shaped and attached to the hole wall of the center hole 501.

[0003] In the existing design, the diaphragm 51 is shaped and attached to the hole wall of the center hole 501 by inserting a rolling needle into the center hole 501 and squeezing the diaphragm 51 through circular hole expansion of the rolling needle. Under this method, the diaphragm 51 is easy to rebound, so it is difficult to ensure the shaping quality. Utility Model Content

[0004] The purpose of the present application is to overcome the deficiencies of the above-mentioned prior art and to provide a battery cell hole hot stamping device and a lithium battery winding machine, which are intended to improve the shaping quality of the diaphragm at the center hole of the battery cell.

[0005] A battery core punching device, applicable to a battery core having a central hole, comprising:

[0006] The hot pressing needle extends along a first direction, and the front end of the hot pressing needle along the first direction is a cone with a decreasing cross-sectional diameter;

[0007] A clamping structure, used for clamping the battery core and making the central hole of the battery core coaxial with the ironing needle;

[0008] A heating structure, used for heating the hot needle;

[0009] A driving structure, used for driving the hot needle to move back and forth along the first direction;

[0010] Wherein, after the ironing needle is heated by the heating structure, the driving structure drives the ironing needle to extend into the central hole of the battery cell to iron and round the battery cell.

[0011] Optionally, the clamping structure includes two battery cell clamps arranged opposite to each other and a clamp driver for controlling the opening and closing of the two battery cell clamps, and the opposing surfaces of the two battery cell clamps are arc surfaces.

[0012] Optionally, the clamping structure further includes a lifting drive, which drives the battery cell clamp to rise and fall so as to clamp the battery cell from the conveying device.

[0013] Optionally, a avoidance hole is provided on the surface of the battery cell clamp facing the conveying device.

[0014] Optionally, the battery core perforating device further comprises a driver for driving the perforating needle to rotate;

[0015] The output shaft of the driver is connected to the ironing needle, and the driving structure drives the driver to move back and forth along the first direction to drive the ironing needle to move.

[0016] Optionally, the battery cell perforating device further includes a fixing frame, the driver is slidably connected to the fixing frame along the first direction, the heating structure is fixed on the fixing frame, and the clamping structure and the driving structure are integrated into the fixing frame.

[0017] Optionally, the heating structure includes a heating box and a heating cylinder arranged in the heating box, the heating cylinder is rotatably connected to the heating box, and the heating cylinder is plugged into the ironing pin and is arranged in coordination with the ironing pin.

[0018] Optionally, both ends of the heating tube are connected to the heating box via bearings, and the heating box forms a heating cavity between the two bearings, and the heating cavity is arranged with a clearance fit with the heating tube.

[0019] A lithium battery winding machine comprises a conveying device and a battery cell perforation device as described above, wherein the conveying device comprises a conveyor belt and a bracket arranged on the conveyor belt, wherein the brackets are provided in plurality and are arranged at intervals along the length direction of the conveyor belt, and each of the brackets can accommodate and position a battery cell, and when the battery cell moves to the perforation station, the battery cell perforation device can clamp the battery cell and perforate the battery cell.

[0020] Optionally, the bracket includes a first supporting portion and a second supporting portion spaced apart along the first direction, the first supporting portion and the second supporting portion each include two supporting blocks disposed opposite to each other, and the opposing surfaces of the two supporting blocks are inclined surfaces inclined toward the middle to jointly support the battery cell.

[0021] The battery cell ironing device provided in the present application can iron and shape the diaphragm and attach it to the wall of the central hole of the battery cell, thereby improving the shaping quality of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of a battery cell before rounding in an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the cooperation between the cell rounding device and the conveying device in the embodiment of the present application;

[0025] Figure 3 yes Figure 2 Front view of the structure;

[0026] Figure 4 It is a structural schematic diagram of a battery core punching device in an embodiment of the present application;

[0027] Figure 5 yes Figure 4 Schematic cross-section of the structure;

[0028] Figure 6 yes Figure 4 Schematic diagram of the coordination between the clamping structure and the battery cell in the structure;

[0029] Figure 7 yes Figure 2 Structural diagram of the bracket in the structure.

[0030] Description of Figure Numbers:

[0031] 10. Battery cell perforating device; 11. Perforating needle; 12. Clamping structure; 121. Battery cell clamping jaws; 101. Avoidance hole; 122. Clamping jaw driver; 123. Lifting driver; 13. Heating structure; 131. Heating box; 132. Heating cylinder; 133. Bearing; 14. Rotator; 15. Fixing frame; 151. Pushing slide rail; 20. Conveying device; 21. Conveyor belt; 22. Bracket; 221. First supporting part; 222. Second supporting part; 50. Battery cell; 501. Center hole; 51. Diaphragm. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] It should also be noted that the directional terms such as left, right, up and down in the embodiments of the present application are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0036] Please refer to Figures 1 to 6 Now, the battery cell hole-punching device 10 provided in the present application and the lithium battery winding machine using the battery cell hole-punching device 10 are exemplarily described.

[0037] Combination Figure 1 The cylindrical battery cell 50 is formed by winding. After forming, a section of diaphragm 51 is often present in the center hole 501 of the battery cell 50 , which is horizontal to the center hole 501 .

[0038] In this embodiment, the hot needle 11 is inserted into the central hole 501 of the battery cell 50 so that the diaphragm 51 is attached to the hole wall of the central hole 501 , and the hot needle 11 heats the diaphragm 51 so that the diaphragm 51 is shaped.

[0039] Specifically, the battery cell perforating device 10 includes a perforating needle 11, a clamping structure 12, a heating structure 13 and a driving structure.

[0040] The ironing needle 11 extends along the first direction, and the front end of the ironing needle 11 along the first direction is a cone with a decreasing cross-sectional diameter. The clamping structure 12 is used to clamp the battery cell 50 and make the central hole 501 of the battery cell 50 coaxial with the ironing needle 11. The heating structure 13 is used to heat the ironing needle 11. The driving structure is used to drive the ironing needle 11 to move back and forth along the first direction.

[0041] After the ironing needle 11 is heated by the heating structure 13 , the driving structure drives the ironing needle 11 to extend into the central hole 501 of the battery cell 50 to iron and round the battery cell 50 .

[0042] In this embodiment, the hot pin 11 extends along the first direction. For the convenience of description, the first direction is defined as the front-to-back direction. The front end of the hot pin 11 is conical. In other words, the front end of the hot pin 11 is a sharp point. This setting can reduce the difficulty of the hot pin 11 entering the center hole 501. More importantly, since the front end of the hot pin 11 is a sharp point, it is not easy to collide with the diaphragm 51 when it is inserted into the center hole 501. Even if it does, the diaphragm 51 is easily deformed after the collision and avoids the hot pin 11, ensuring that the hot pin 11 is smoothly inserted into the center hole 501.

[0043] After entering the central hole 501, the ironing needle 11 presses the membrane 51 against the wall of the central hole 501, and irons the membrane 51 by the heated ironing needle 11, thereby achieving an ironing effect. Compared with a single pressing operation, the effect of the membrane 51 being attached to the wall of the central hole 501 can be maintained for a longer period of time, thereby ensuring the shaping quality.

[0044] The hot needle 11 is heated before entering the central hole 501 of the battery cell 50. In other words, the heating of the hot needle 11 is performed outside the battery cell 50 to facilitate the arrangement of the heating structure 13 and the clamping structure.

[0045] In the structure shown in the figure, the heating structure 13 is located behind the clamping structure along the first direction. After being heated by the heating structure 13, the ironing needle 11 moves forward and is inserted into the central hole 501 of the battery cell 50 fixed by the clamping structure.

[0046] The clamping structure is used to clamp the battery cell 50 and make the central hole 501 of the battery cell 50 coaxial with the ironing needle 11. After the clamping structure clamps the battery cell 50, since the central hole 501 of the battery cell 50 is coaxial with the ironing needle 11, the ironing needle 11 only needs to move forward to be inserted into the central hole 501 of the battery cell 50, and move backward to reset, thereby simplifying the control.

[0047] In another embodiment of the present application, please refer to Figure 5 The clamping structure 12 includes two battery cell clamping jaws 121 arranged opposite to each other and a clamping jaw driver 122 for controlling the opening and closing of the two battery cell clamping jaws 121 . The opposing surfaces of the two battery cell clamping jaws 121 are arc surfaces.

[0048] The two battery cell clamps 121 are arranged opposite to each other, and the battery cell 50 can be taken in and out by opening and closing. The surfaces of the two battery cell clamps 121 facing each other are arc surfaces, which are adapted to the battery cell 50, so that when the two battery cell clamps 121 are close to each other, the battery cell 50 can be adaptively moved to the central axis of the cylindrical surface formed by the two arc surfaces, thereby realizing the centering of the battery cell 50. The central axis of the cylindrical surface is coaxial with the ironing needle 11, so as to ensure that the ironing needle 11 moves forward and can be inserted into the central hole 501 of the battery cell 50.

[0049] In other embodiments, the opposing surfaces of the two battery cell clamping jaws 121 may also be enclosed to form a polygonal prism surface that is tangent to the battery cell 50 , which is not limited here.

[0050] In this embodiment, the two battery clamps 121 are synchronously moved toward the middle by the clamp driver 122 to clamp the battery 50, and separated to both sides to release the battery 50. In other embodiments, the two battery clamps 121 can also be opened and closed in a hinged manner, which is not limited here.

[0051] In another embodiment of the present application, please combine Figure 3 and Figure 4 The clamping structure 12 further includes a lifting driver 123 , which drives the battery cell clamping claw 121 to rise and fall so as to clamp the battery cell 50 from the conveyor belt 21 .

[0052] After being wound and formed, the battery cell 50 is conveyed to the ironing station via the conveyor belt 21. At this time, the clamping structure 12 is located above the battery cell 50, and the lifting driver 123 drives the battery cell clamping jaws 121 to move down to the battery cell 50 to be ironed, and then the clamping jaw driver 122 drives the battery cell clamping jaws 121 to move together to achieve the clamping and centering of the battery cell 50. After clamping, the lifting driver 123 drives the battery cell clamping jaws 121 to move up to the height corresponding to the ironing needle 11, so that the battery cell 50 and the ironing needle 11 are coaxial.

[0053] Figure 4 In the structure shown, the battery cell perforation device 10 includes a fixed frame 15, on which a lifting slide rail extending up and down is provided, and a lifting slider is slidably connected to the lifting slide rail. A clamp driver 122 and a battery cell clamp 121 are provided on the lifting slider, and the lifting and lowering drive the lifting slider to move up and down to realize the up and down movement of the battery cell clamp 121.

[0054] The lifting driver 123 may be a motor or a cylinder, which is not limited here.

[0055] In another embodiment of the present application, please refer to Figure 4 The surface of the battery core clamping claw 121 facing the conveyor belt 21 is provided with an avoidance hole 101 .

[0056] Please combine Figure 2 The battery cell 50 is transported to the ironing station by the conveying device 20, and the clamping structure 12 of the battery cell ironing device 10 clamps the battery cell 50 at the ironing station and then performs the ironing operation. Figure 2 and Figure 3 The conveying device 20 includes a conveyor belt 21 and a bracket 22 arranged on the conveyor belt 21. There are multiple brackets 22 and they are arranged at intervals along the length direction of the conveyor belt 21. Each bracket 22 can accommodate and position a battery cell 50. When the battery cell 50 moves to the ironing station, the battery cell ironing device 10 can clamp the battery cell 50 and iron the battery cell 50.

[0057] The bracket 22 is used to carry and limit the movement of the battery cell 50 along the conveying direction on the conveyor belt 21, so that when the battery cell 50 reaches the rounding station, the position of the battery cell perforating device 10 is relatively fixed. The upward movement of the battery cell 50 is not restricted to avoid the taking and placing of the clamping structure 12.

[0058] In another embodiment of the present application, please refer to Figure 7 The bracket 22 includes a first support portion 221 and a second support portion 222 spaced apart along a first direction. The first support portion 221 and the second support portion 222 each include two support blocks disposed opposite to each other. The opposing surfaces of the two support blocks are inclined surfaces inclined toward the middle to jointly support the battery cell 50 .

[0059] The first support part 221 and the second support part 222 are provided to jointly define the axial direction of the battery cell 50, ensuring that the axial direction of the battery cell 50 is parallel to the hot needle 11. The first support part 221 and the second support part 222 each include two support blocks, which are inclined toward the middle to center the battery cell 50 and limit the movement of the battery cell 50 in the direction of the conveyor line.

[0060] In combination with the above, the surface of the battery clamp 121 facing the conveyor belt 21 is provided with an escape hole 101. The escape hole 101 is used to escape the support block to prevent the battery clamp 121 from interfering or conflicting with the support block when clamping the battery 50, thereby affecting the rounding operation of the battery 50.

[0061] In another embodiment of the present application, please refer to Figure 4 The battery core perforating device 10 further includes a driver 14 for driving the perforating needle 11 to rotate;

[0062] The output shaft of the driver 14 is connected to the ironing needle 11, and the driving structure drives the driver 14 to move back and forth along the first direction to drive the ironing needle 11 to move.

[0063] Figure 4 In the structure shown, a push slide rail 151 is provided on the fixed frame 15, and the push slide rail 151 extends forward and backward. The push slide rail 151 is slidably connected with a push slider. The driver 14 is fixed on the slider, and the rotating shaft of the driver 14 is connected to the ironing needle 11 through a coupling. The driving structure drives the push slider to move forward and drives the ironing needle 11 to move forward.

[0064] After the clamping structure 12 clamps the battery cell 50 and makes the central hole 501 of the battery cell 50 coaxial with the ironing pin 11, the driving structure drives the ironing pin 11 to move forward while the driver 14 drives the ironing pin 11 to rotate, so that the ironing pin 11 is screwed into the battery cell 50. This setting can further reduce the impact of the friction between the ironing pin 11 and the diaphragm 51 on the ironing rounding effect. In addition, after the ironing pin 11 enters the battery cell 50, the ironing pin 11 abuts against the hole wall of the central hole 501 of the battery cell 50. The rotation of the ironing pin 11 can help reduce the adhesion between the ironing pin 11 and the diaphragm 51, ensuring the ironing rounding effect.

[0065] In this embodiment, the driver 14 is a motor.

[0066] In another embodiment of the present application, the outer surface of the ironing pin 11 is coated with a heat-conductive anti-sticking adhesive to further reduce the risk of adhesion between the ironing pin 11 and the diaphragm 51.

[0067] In another embodiment of the present application, please refer to Figure 4 , the heating structure 13 is fixed on the fixing frame 15. In combination with the above, the push slide rail 151 and the lifting slide rail are fixed on the fixing frame 15. In other words, the heating structure 13, the driving structure, and the clamping structure 12 are fixed by the fixing frame 15 to ensure the relative position relationship between each other.

[0068] In another embodiment of the present application, please refer to Figure 5 The heating structure 13 includes a heating box 131 and a heating tube 132 disposed in the heating box 131 . The heating tube 132 is rotatably connected to the heating box 131 . The heating tube 132 is plugged into the ironing needle 11 and is matched with the ironing needle 11 .

[0069] The length of the ironing needle 11 is not less than twice the length of the heating box 131, and the front and rear of the ironing needle 11 are divided into a heating zone and an extension zone. In the initial state, the heating zone of the ironing needle 11 is located in the heating box 131 and heated to a preset temperature. After the clamping structure 12 clamps the battery cell 50, the ironing needle 11 moves forward so that the heating zone of the ironing needle 11 extends into the battery cell 50 to iron the battery cell 50. At this time, the extension zone is located in the heating box 131.

[0070] Considering that the ironing pin 11 needs to move forward and backward and rotate relative to the heating box 131, a heating cylinder 132 is sleeved on the ironing pin 11, and the ironing pin 11 can move forward and backward relative to the heating cylinder 132, and the heating cylinder 132 can rotate relative to the heating cylinder 132. The setting of the heating cylinder 132 separates the functions of relative rotation and relative movement between the heating structure 13 and the ironing pin 11, and the movement relative to the heating structure 13 is achieved by the sliding connection between the ironing pin 11 and the heating cylinder 132, and the rotation of the ironing pin 11 relative to the heating structure 13 is achieved by the rotation of the heating cylinder 132 and the heating box 131. In addition, the heating cylinder 132 is a heat transfer component, preferably a metal component. The heating cylinder 132 contacts the surface of the ironing pin 11 to achieve heat conduction, which has a higher conduction efficiency than air heat transfer.

[0071] In another embodiment of the present application, both ends of the heating tube 132 are connected to the heating box 131 through bearings 133 , and the heating box 131 forms a heating cavity between the two bearings 133 , and the heating cavity is arranged with a clearance fit with the heating tube 132 .

[0072] The two ends of the heating cylinder 132 are connected to the heating box 131 through bearings 133 to reduce the friction between the heating cylinder 132 and the heating box 131. The heating box 131 forms a heating cavity between the two bearings 133 to heat the heating cylinder 132. In this embodiment, there is a gap between the cavity wall of the heating cavity and the heating cylinder 132 to avoid friction caused by the contact between the heating cylinder 132 and the heating box 131.

[0073] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery core punching device, suitable for a battery core having a central hole, characterized in that: include: The hot pressing needle extends along a first direction, and the front end of the hot pressing needle along the first direction is a cone with a decreasing cross-sectional diameter; A clamping structure, used for clamping the battery core and making the central hole of the battery core coaxial with the ironing needle; A heating structure, used for heating the hot needle; A driving structure, used for driving the hot needle to move back and forth along the first direction; Wherein, after the ironing needle is heated by the heating structure, the driving structure drives the ironing needle to extend into the central hole of the battery cell to iron and round the battery cell.

2. The battery core punching device according to claim 1, characterized in that: The clamping structure comprises two battery core clamps arranged opposite to each other and a clamp driver for controlling the opening and closing of the two battery core clamps. The surfaces opposite to each other of the two battery core clamps are arc surfaces.

3. The battery core perforating device according to claim 2, characterized in that: The clamping structure also includes a lifting driver, which drives the battery core clamping claw to rise and fall so as to clamp the battery core from the conveying device.

4. The battery core perforating device according to claim 3, characterized in that: The surface of the battery core clamp facing the conveying device is provided with an avoidance hole.

5. The battery core punching device according to any one of claims 1 to 4, characterized in that: The battery core perforating device also includes a driver for driving the perforating needle to rotate; The output shaft of the driver is connected to the ironing needle, and the driving structure drives the driver to move back and forth along the first direction to drive the ironing needle to move.

6. The battery core perforating device according to claim 5, characterized in that: The battery core perforating device further comprises a fixing frame, the driver is slidably connected with the fixing frame along the first direction, the heating structure is fixed on the fixing frame, and the clamping structure and the driving structure are integrated into the fixing frame.

7. The battery core punching device according to any one of claims 1 to 4, characterized in that: The heating structure comprises a heating box and a heating cylinder arranged in the heating box, the heating cylinder is rotatably connected to the heating box, and the heating cylinder is plugged into the ironing pin and is arranged in cooperation with the ironing pin.

8. The battery core perforating device according to claim 7, characterized in that: Both ends of the heating cylinder are connected to the heating box through bearings. The heating box forms a heating cavity between the two bearings. The heating cavity and the heating cylinder are arranged in a clearance fit.

9. A lithium battery winding machine, characterized in that: It comprises a conveying device and a battery cell perforating device as claimed in any one of claims 1 to 8, wherein the conveying device comprises a conveyor belt and a bracket arranged on the conveyor belt, wherein there are a plurality of brackets which are arranged at intervals along the length direction of the conveyor belt, and each of the brackets can accommodate and position a battery cell, and when the battery cell moves to the perforating station, the battery cell perforating device can clamp the battery cell and perforate the battery cell.

10. The lithium battery winding machine according to claim 9, characterized in that: The bracket includes a first support portion and a second support portion spaced apart along the first direction, the first support portion and the second support portion each include two support blocks disposed opposite to each other, and the opposing surfaces of the two support blocks are inclined surfaces inclined toward the middle to jointly support the battery cell.

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