Cylindrical roll core end face glue pressing structure

Abstract

The utility model relates to the technical field of roll core glue pressing, and provides a cylindrical roll core end face glue pressing structure which comprises a furling cylinder and a rolling unit, a glue pressing opening is formed in the furling cylinder, the inner diameter of the glue pressing opening is gradually reduced in the axial direction, the inner diameters of the two ends of the glue pressing opening are D1 and D2 respectively, the outer diameter of glue paper on the peripheral side of a roll core is D0, and D1 < D0 < D2; the rolling unit comprises a rotary driving device, a connecting seat and a roller, and the connecting seat is fixedly arranged at the output end of the rotary driving device; and the roller is rotationally arranged on the connecting seat. The end face of insulated gummed paper can be folded by forming the glue pressing opening with the inner diameter gradually decreased in the one-way mode in the folding cylinder, the rotary driving device, the connecting base and the idler wheel are arranged, the idler wheel is used for rolling the end face of the insulated gummed paper, stress on the insulated gummed paper can be more uniform and sufficient, and the production efficiency is improved. Therefore, the problems of wrinkles, infirm adhesion and the like of the insulating gummed paper are avoided, and the adhesive pressing quality of the roll core is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of core bonding technology, and in particular to a cylindrical core end face bonding structure. Background Technology

[0002] In the manufacturing process of cylindrical batteries, in order to effectively avoid problems such as poor casing voltage caused by direct contact between the tabs and the battery casing wall, the industry generally sets an insulating adhesive paper on the edge of the cylindrical battery tabs. This effectively improves the safety and reliability of cylindrical batteries, reduces the incidence of quality problems such as poor casing voltage caused by contact between the tabs and the casing wall, and is of great significance for ensuring battery performance and service life.

[0003] After the insulating tape is applied to the periphery of the core, the end face of the insulating tape needs to be pressed. For example, an automatic tape applicator for battery cells disclosed in the invention patent with announcement number CN113471507B is equipped with a folding component and a movable fifth pressure block. First, the folding component is used to fold the tape skirt onto the end face of the core, and then the fifth pressure block is used to press the end face of the core to firmly adhere the skirt to the end face of the core.

[0004] However, when the skirt is folded to the end face of the core by the folding component, there is a certain gap between the skirt and the end face of the core. At this time, if the skirt is directly squeezed by the fifth pressure block, wrinkles will appear on the skirt. Wrinkles on the adhesive tape will not only damage the insulation of the core and pose a safety hazard, but also make it difficult for the subsequent processing of the core and reduce the processing efficiency of the core. Utility Model Content

[0005] In view of this, the present invention proposes a cylindrical core end face pressing structure, which can improve the flatness of the adhesive paper surface after pressing operation and effectively improve the overall performance of the core.

[0006] The technical solution of this utility model is achieved as follows: This utility model provides a cylindrical core end face pressing structure, including a gathering cylinder and a roller pressing unit, wherein,

[0007] The gathering tube is provided with a glue-pressing port. The inner diameter of the glue-pressing port gradually decreases along its axial direction. The inner diameters at both ends are D1 and D2, respectively. The outer diameter of the adhesive paper on the periphery of the core is D0, where D1 < D0 < D2.

[0008] The roller pressing unit includes a rotary drive device, a connecting seat, and rollers. The connecting seat is fixedly mounted on the output end of the rotary drive device. The rollers are rotatably mounted on the connecting seat, and the rotation axis of the rollers is perpendicular to the rotation axis of the output shaft of the rotary drive device.

[0009] Based on the above technical solutions, preferably, the connecting seat includes a collar, a wheel seat, and a spring, wherein,

[0010] The collar is fixedly mounted on the output end of the rotary drive device;

[0011] The wheel seat is slidably mounted on the collar, and the roller is rotatably mounted on the wheel seat;

[0012] The two ends of the spring abut against the wheel seat and the collar, respectively.

[0013] More preferably, the connecting seat further includes a top plate and adjusting bolts, wherein,

[0014] The top plate is abutting between the spring and the collar;

[0015] The adjusting bolt is threaded onto the collar and abuts against the side of the top plate away from the spring.

[0016] Based on the above technical solutions, preferably, the pressure port includes a conical segment, an arc segment, and a straight segment arranged sequentially and coaxially, and the inner diameter of the straight segment is smaller than the inner diameter of the conical segment.

[0017] More preferably, the conical segment has a conical hole structure, and the angle between its sidewall and its axis is α, wherein 10°≤α≤40°.

[0018] More preferably, the inner diameter of the tapered segment near the end of the straight segment is D3, wherein 0.8mm≤(D3-D0)≤1.2mm.

[0019] More preferably, the sidewall of the arc segment is arc-shaped, and the radius of the arc angle of the sidewall of the arc segment is R1, wherein 0.15mm≤R1≤0.35mm.

[0020] More preferably, the axis of the straight section coincides with the axis of the output end of the rotary drive device.

[0021] Based on the above technical solutions, preferably, (D2-D0) > 1.5mm, and 0.5mm ≤ (D0-D1) ≤ 1mm.

[0022] Based on the above technical solutions, preferably, the roller includes a wheel body and a flexible layer, wherein,

[0023] The wheel is rotatably mounted on the connecting seat;

[0024] The flexible layer is fixedly disposed on the periphery of the wheel body.

[0025] The cylindrical core end face pressing structure of this utility model has the following advantages over the prior art:

[0026] (1) By opening a pressure port with a unidirectional decreasing inner diameter in the coil, the end face of the insulating tape can be folded. By setting a rotary drive device, connecting seat and roller, the roller is used to roll the end face of the insulating tape, which can make the force on the insulating tape more uniform and sufficient, so as to avoid problems such as wrinkles and poor adhesion of the insulating tape, thereby ensuring the pressure quality of the core.

[0027] (2) By setting the connecting seat to include a collar, wheel seat and spring, the roller can move elastically, avoiding the pressing defects caused by excessive roller pressure. By setting the top plate and adjusting bolts, the initial elastic force and contraction amount of the spring can be adjusted, so that the device can adapt to the needs of different core pressing operations.

[0028] (3) By setting the sealing port to include a conical section, an arc section and a straight section, and limiting the specifications of the sealing port, the edge-turning effect of the coiling tube on the insulating tape can be effectively improved, and the sealing quality of the core can be further improved. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a cross-sectional view of a cylindrical core end face adhesive pressing structure according to the present invention;

[0031] Figure 2 This is a perspective view of the roller pressing unit in the end face pressing structure of a cylindrical core according to this utility model;

[0032] Figure 3 This is a cross-sectional view of the connecting seat in a cylindrical core end face pressing structure of this utility model;

[0033] Figure 4 This is a cross-sectional view of the gathering cylinder in the end face pressing structure of a cylindrical core according to this utility model;

[0034] Figure 5 This is a partial cross-sectional view of the adhesive-pressing port in a cylindrical core end-face adhesive-pressing structure according to the present invention.

[0035] The components include: 1. Gathering cylinder; 101. Sealing port; 1011. Conical section; 1012. Arc section; 1013. Straight section; 2. Roller pressing unit; 21. Rotary drive device; 22. Connecting seat; 221. Collar; 222. Wheel seat; 223. Spring; 224. Top plate; 225. Adjusting bolt; 23. Roller; 231. Wheel body; 232. Flexible layer; 3. Core. Detailed Implementation

[0036] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] Core 3 is the core component of the cylindrical battery, mainly composed of positive electrode sheet, negative electrode sheet, separator, and tabs. After the winding operation of Core 3 is completed, insulating tape needs to be pasted around its periphery. The insulating tape not only constrains the shape of Core 3, keeping it in a regular cylindrical form, which is beneficial for subsequent battery assembly and packaging, ensuring the consistency and stability of the overall battery structure, but also provides insulation for Core 3, preventing abnormal conduction within the battery and further improving the battery's safety and reliability.

[0038] In order to improve the protective performance of the insulating tape and the firmness of the fixing between the insulating tape and the core 3, it is necessary not only to attach the insulating tape to the periphery of the core 3, but also to fold the end face of the insulating tape and adhere it to the end face of the core 3.

[0039] The present invention provides a cylindrical core end face pressing structure, which includes a gathering cylinder 1 and a roller pressing unit 2. After the insulating adhesive paper is pasted on the periphery of the core 3, the end face of the insulating adhesive paper can be folded and attached to the end face of the core 3 using this pressing structure.

[0040] like Figure 1 As shown, the coiling cylinder 1 is provided with a pressure-applying port 101. The inner diameter of the pressure-applying port 101 gradually decreases along its axial direction. The inner diameters at both ends of the pressure-applying port 101 are D1 and D2, respectively. The outer diameter of the adhesive paper around the core 3 is D0, where D1 < D0 < D2. That is, the outer diameter of the core 3 is located between the inner diameters at both ends of the pressure-applying port 101. After the core 3 completes the adhesive application, the end of the core 3 is inserted into the pressure-applying port 101. By using the pressure of the inner wall of the pressure-applying port 101 on the end of the insulating adhesive paper, the end of the insulating adhesive paper can be folded towards the axis of the core 3.

[0041] like Figure 2As shown, the rolling unit 2 includes a rotary drive device 21, a connecting seat 22, and a roller 23. The connecting seat 22 is fixedly mounted on the output end of the rotary drive device 21. The roller 23 is rotatably mounted on the connecting seat 22, and the rotation axis of the roller 23 is perpendicular to the rotation axis of the output shaft of the rotary drive device 21. The rotary drive device 21 is preferably a motor. When the rotary drive device 21 is started, it can drive the roller 23 to rotate in a plane. When the core 3, after the end face of the insulating adhesive paper has been folded, is brought close to the roller 23, the roller 23 can be used to roll and press the end face of the insulating adhesive paper, thereby flatly holding the end face of the insulating adhesive paper against the end face of the core 3.

[0042] like Figure 1 As shown, the gathering cylinder 1 is fixedly set on the pressing station, and the core 3 and the roller pressing unit 2 are both fixed on the lifting mechanism. First, the lifting mechanism is used to drive the core 3 into the gathering cylinder 1 to fold the end face of the insulating paper. Then, the lifting mechanism is used to drive the roller pressing unit 2 to move into the pressing port 101 to roll the end face of the folded insulating paper to achieve the pressing operation.

[0043] Of course, both the gathering cylinder 1 and the roller pressing unit 2 can be installed on the lifting mechanism, and the above-mentioned pressing operation can be achieved by moving the two.

[0044] Different cores 3 and insulating tapes require different roller pressures. When the end face of the insulating tape is in rigid contact, if the roller pressure is too low, the insulating tape cannot properly adhere to the core 3, causing the insulating tape to rebound after pressing. If the roller pressure is too high, it is easy to damage the core 3, leading to problems such as short circuits in the battery. If the roller pressure is uneven, it will reduce the pressing effect.

[0045] Therefore, the connector 22 was designed as follows: Figure 3 As shown, the connecting seat 22 includes a collar 221, a wheel seat 222, a spring 223, a top plate 224, and an adjusting bolt 225. The collar 221 is fixedly mounted on the output end of the rotary drive device 21. The wheel seat 222 is slidably mounted on the collar 221. The roller 23 is rotatably mounted on the wheel seat 222. The two ends of the spring 223 abut against the wheel seat 222 and the collar 221, respectively. Figure 1 As shown, when the lifting mechanism drives the roller pressing unit 2 to move and press the end of the core 3, the elastic contraction of the spring 223 can avoid damage to the core 3 caused by excessive roller pressure.

[0046] In some embodiments, the contraction amount of spring 223 is 1mm-3mm. If the contraction amount of spring 223 is less than 1mm, its contraction effect is not ideal and cannot provide a good elastic support effect. If the contraction amount of spring 223 is greater than 3mm, it will increase the stroke of the roller pressing unit 2, which is not conducive to the rapid progress of the pressing operation.

[0047] The top plate 224 is positioned between the spring 223 and the collar 221. The adjusting bolt 225 is threadedly connected to the collar 221 and abuts against the side of the top plate 224 away from the spring 223. Figure 3 As shown, when the adjusting bolt 225 is rotated, it can be supported against the top plate 224 and moved up and down, thereby adjusting the initial elastic force and contraction stroke of the spring 223, so that the elastic support effect of the connecting seat 22 can adapt to the needs of different pressing operations.

[0048] To prevent the wheel seat 222 from detaching from the collar 221, it is preferable to insert one end of the wheel seat 222 into the collar 221, and to provide sliding blocks and groove structures on both to prevent the wheel seat 222 from detaching from the collar 221 after being supported by the spring 223.

[0049] like Figure 2 As shown, the roller 23 includes a wheel body 231 and a flexible layer 232. The wheel body 231 is rotatably mounted on the connecting seat 22, and the flexible layer 232 is fixedly mounted on the periphery of the wheel body 231. The flexible layer 232 is made of soft materials such as silicone and flexible rubber, which can also prevent the roller 23 from damaging the core 3.

[0050] like Figure 1 and Figure 2 As shown, it is preferable to provide multiple rollers 23 and arrange them in a circumferential array around the axis of the output end of the rotary drive device 21, thereby improving the efficiency and uniformity of the adhesive pressing operation.

[0051] like Figure 4 As shown, the pressure-sealing nozzle 101 includes a conical segment 1011, an arc-shaped segment 1012, and a straight segment 1013 arranged sequentially. The axes of the conical segment 1011, the arc-shaped segment 1012, and the straight segment 1013 coincide, and the inner diameter of the straight segment 1013 is smaller than the inner diameter of the conical segment 1011. The conical segment 1011 has a conical hole structure so that the end of the core 3 can be smoothly inserted into the pressure-sealing nozzle 101; the sidewall of the arc-shaped segment 1012 is arc-shaped, so that the end of the adhesive paper around the core 3 can be rolled up to achieve a better folding effect; the straight segment 1013 has a circular hole structure for the roller 23 to pass through.

[0052] like Figure 1 As shown, the axis of the straight section 1013 coincides with the axis of the output end of the rotary drive device 21. After the roller 23 extends into the straight section 1013, the rotary drive device 21 drives the roller 23 to rotate around the axis of the straight section 1013, thereby improving the uniformity of the pressing operation.

[0053] like Figure 3 and Figure 4As shown, the angle between the sidewall of the conical segment 1011 and the axis of the conical segment 1011 is α, the inner diameter of the end of the conical segment 1011 away from the straight segment 1013 is D2, the inner diameter of the end of the conical segment 1011 close to the straight segment 1013 is D3, the radius of the arc angle of the sidewall of the arc segment 1012 is R1, and the inner diameter of the end of the straight segment 1013 away from the conical segment 1011 is D1.

[0054] In some embodiments, (D2-D0) > 1.5 mm, that is, the difference between the inner diameter of the end of the tapered section 1011 away from the straight section 1013 and the outer diameter of the adhesive tape around the core 3 is greater than 1.5 mm. If (D2-D0) ≤ 1.5 mm, the ends of the core 3 and the adhesive tape are not easy to insert into the tapered section 1011, which increases the difficulty of the pressing operation.

[0055] In some embodiments, 10°≤α≤40°, that is, the angle between the sidewall of the tapered segment 1011 and the axis of the tapered segment 1011 is 15°, 25° or 35°, etc. If α≤10°, the inner diameter of the end of the tapered segment 1011 away from the straight segment 1013 is too small, making it difficult for the ends of the core 3 and the adhesive tape to be inserted into the tapered segment 1011, increasing the difficulty of the pressing operation; if α>40°, the inner diameter of the end of the tapered segment 1011 away from the straight segment 1013 is too large, making it difficult to maintain the coaxiality of the core 3 and the tapered segment 1011, and the end face of the adhesive tape is easily squeezed against the inner wall of the tapered segment 1011, causing the adhesive tape to fold prematurely in some areas, affecting the overall folding effect of the adhesive tape.

[0056] In some embodiments, 0.8mm ≤ (D3-D0) ≤ 1.2mm, that is, the difference between the inner diameter of the tapered section 1011 near the straight section 1013 and the outer diameter of the adhesive tape around the core is 0.8mm, 1mm, or 1.2mm, etc. If (D3-D0) < 0.8mm, the end face of the adhesive tape is easily squeezed against the inner wall of the tapered section 1011, causing the adhesive tape to fold prematurely in some areas, affecting the overall folding effect of the adhesive tape; if (D3-D0) > 1.2mm, the distance between the adhesive tape and the arc section 1012 near the tapered section 1011 is too large, increasing the stroke of the adhesive tape end face folding operation, which is not conducive to improving the folding efficiency of the adhesive tape end face.

[0057] In some embodiments, 0.15mm≤R1≤0.35mm, that is, the radius of curvature of the sidewall of the arc segment 1012 is 0.15mm, 0.25mm, or 0.35mm, etc. If R1<0.15mm, the curvature of the sidewall of the arc segment 1012 is large, and the end face of the adhesive tape is prone to problems such as difficulty in folding or curling. If R1>0.35mm, the inner wall of the arc segment 1012 is relatively straight, resulting in an unsatisfactory folding effect of the end face of the adhesive tape, which does not meet the folding requirements of the pressing operation.

[0058] In some embodiments, 0.5mm ≤ (D0-D1) ≤ 1mm, that is, the difference between the outer diameter of the adhesive tape on the three sides of the core and the inner diameter of the end of the straight section 1013 away from the tapered section 1011 is 0.5mm, 0.75mm, or 1mm, etc. If (D0-D1) < 0.5mm, the end face of the adhesive tape can easily pass directly through the straight section 1013, affecting the folding effect of the end face of the adhesive tape; if (D0-D1) > 1mm, the inner diameter of the straight section 1013 is too small, reducing the rolling range of the roller 23, which is not conducive to improving the rolling flatness of the end face of the adhesive tape.

[0059] The method of using the cylindrical core end face pressure adhesive structure of this utility model is as follows:

[0060] The coiling cylinder 1 is fixedly set on the adhesive pressing station. The core 3 and the roller pressing unit 2 are both fixed on the lifting mechanism. First, the lifting mechanism is used to drive the core 3 into the adhesive pressing port 101. The inner wall of the arc section 1012 is used to fold the end face of the insulating adhesive paper so that the angle between the end of the adhesive paper and the end face of the core 3 is less than 45°. Then, the lifting mechanism is used to drive the roller pressing unit 2 to move into the straight section 1013 so that the roller 23 can roll the folded insulating adhesive paper to fix it on the end face of the core 3.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cylindrical core end face adhesive pressing structure, characterized in that: Includes a gathering cylinder (1) and a roller pressing unit (2), wherein, The gathering tube (1) is provided with a glue-pressing port (101). The inner diameter of the glue-pressing port (101) gradually decreases along its axial direction. The inner diameters at both ends are D1 and D2, respectively. The outer diameter of the adhesive paper around the core (3) is D0, where D1 < D0 < D2. The roller pressing unit (2) includes a rotary drive device (21), a connecting seat (22) and a roller (23). The connecting seat (22) is fixedly mounted on the output end of the rotary drive device (21). The roller (23) is rotatably mounted on the connecting seat (22), and the rotation axis of the roller (23) is perpendicular to the rotation axis of the output shaft of the rotary drive device (21).

2. The cylindrical core end face pressing structure as described in claim 1, characterized in that: The connecting seat (22) includes a collar (221), a wheel seat (222), and a spring (223), wherein, The collar (221) is fixedly mounted on the output end of the rotary drive device (21); The wheel seat (222) is slidably disposed on the collar (221), and the roller (23) is rotatably disposed on the wheel seat (222); The two ends of the spring (223) abut against the wheel seat (222) and the collar (221), respectively.

3. The cylindrical core end face pressing structure as described in claim 2, characterized in that: The connecting seat (22) further includes a top plate (224) and an adjusting bolt (225), wherein, The top plate (224) is abutted between the spring (223) and the collar (221); The adjusting bolt (225) is threadedly connected to the collar (221) and abuts against the side of the top plate (224) away from the spring (223).

4. The cylindrical core end face pressing structure as described in claim 1, characterized in that: The pressure port (101) includes a conical segment (1011), an arc segment (1012), and a straight segment (1013) arranged sequentially and coaxially, and the inner diameter of the straight segment (1013) is smaller than the inner diameter of the conical segment (1011).

5. The cylindrical core end face pressing structure as described in claim 4, characterized in that: The conical segment (1011) has a conical hole structure, and the angle between its sidewall and its axis is α, where 10°≤α≤40°.

6. The cylindrical core end face pressing structure as described in claim 5, characterized in that: The inner diameter of the tapered segment (1011) near the straight segment (1013) is D3, wherein 0.8mm≤(D3-D0)≤1.2mm.

7. The cylindrical core end face pressing structure as described in claim 4, characterized in that: The sidewall of the arc segment (1012) is arc-shaped, and the radius of the arc angle of the sidewall of the arc segment (1012) is R1, wherein 0.15mm≤R1≤0.35mm.

8. The cylindrical core end face pressing structure as described in claim 4, characterized in that: The axis of the straight section (1013) coincides with the axis of the output end of the rotary drive device (21).

9. A cylindrical core end face adhesive pressing structure as described in any one of claims 1-8, characterized in that: (D2-D0)>1.5mm, and 0.5mm≤(D0-D1)≤1mm.

10. A cylindrical core end face adhesive pressing structure as described in any one of claims 1-8, characterized in that: The roller (23) includes a wheel body (231) and a flexible layer (232), wherein, The wheel (231) is rotatably mounted on the connecting seat (22); The flexible layer (232) is fixedly disposed on the periphery of the wheel body (231).

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