Drill bit for pulling rubber nail and device for pulling rubber nail

Abstract

The utility model provides a drill bit for pulling out a rubber nail and a device for pulling out the rubber nail. The drill bit for pulling out the plastic nail comprises a drill bit body (11); the multiple blade structures (12) are arranged on the outer surface of the drill bit body (11) in a spiral shape. The drill bit for pulling out the rubber nail can penetrate into the rubber nail with high hardness by using smaller force, so that the phenomenon that the rubber nail falls into a battery cell due to excessive force is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production technical field, specifically, relate to a drill bit for pulling out glue nail and device for pulling out glue nail. BACKGROUND

[0002] Secondary battery, as indispensable energy storage unit in modern electronic equipment and automobile industry, its manufacturing process includes multiple key steps, for example, liquid injection, formation, secondary liquid injection and sealing etc. Among them, the formation process is the key step of activating the internal materials of the battery and forming SEI film (solid electrolyte interface film), and the secondary liquid injection is the supplement process of electrolyte after formation. After the completion of secondary liquid injection, the liquid injection hole needs to be sealed by using sealing glue nail to ensure that the electrolyte will not leak, and at the same time maintain the airtightness of the battery interior. The sealing glue nail plays the role of "the last line of defense" after the completion of the formation and secondary liquid injection of the battery, therefore, the correct installation of the sealing glue nail is a key link in the production process of the battery, which is crucial to the performance and safety of the battery.

[0003] If the sealing glue nail appears abnormal in the installation process, such as burr, skew, it will cause the helium leakage detection of the battery cell to be unqualified, and the sealing laser welding quality to be unqualified (such as nail warping, no nail welding, skew nail) and other problems, at this time, the poor sealing glue nail needs to be taken out. CONTENT OF THE UTILITY MODEL

[0004] At present, for the poor glue nail that needs to be taken out, the common tools include picking needle and hook. The main limitation of these tools is that they usually do not have enough hardness to pierce and penetrate into the high hardness glue nail (about 80HA), therefore, when the operator uses these tools, he often exerts a large force, which causes the glue nail to easily fall into the battery interior, not only reduces the success rate of taking out the glue nail, but also damages the structure and performance of the battery cell, increases the safety hazard.

[0005] The main purpose of the utility model is to provide a drill bit for pulling out glue nail and device for pulling out glue nail, which can penetrate into the high hardness glue nail interior with smaller force, avoiding the glue nail falling into the battery interior due to excessive force.

[0006] In order to achieve the above purpose, according to one aspect of the utility model, a drill bit for pulling out glue nail is provided, which comprises:

[0007] Drill bit body; a plurality of cutting edge structures, a plurality of cutting edge structures are arranged in spiral on the outer surface of the drill bit body.

[0008] As an implementation mode, the drill bit body includes a connecting end and a drilling end, and the plurality of cutting edge structures are arranged between the connecting end and the drilling end.

[0009] As an implementation form, the drill bit body is conical as a whole along a direction from the connecting end to the drilling end, and the plurality of cutting edge structures converge to form a drill tip at the drilling end of the drill bit body.

[0010] As an implementation form, the plurality of cutting edge structures are parallel to each other at the connecting end.

[0011] As an implementation form, the spiral direction of the plurality of cutting edge structures is counterclockwise or clockwise.

[0012] As an implementation form, the length L1 of the drill bit body is less than the length L2 of the rubber nail.

[0013] As an implementation form, the material of the drill bit body is high-carbon steel, and the high-carbon steel has a carbon content of 0.90wt%-1.00wt%.

[0014] According to another aspect of the utility model, a kind of is provided with device for pulling rubber nail, including above-mentioned pulling rubber nail drill bit, guide rod, knock part and knock stop, knock part is sleeved on guide rod, pulling rubber nail drill bit is arranged at the first end of guide rod, knock stop is arranged at the second end of guide rod, and knock part is formed stop to the knock movement.

[0015] As an implementation form, the connecting end of the pulling rubber nail drill bit is provided with an anti-overpressure part, and the projection area of the anti-overpressure part has a part outside the projection area of the pulling rubber nail drill bit when projected on a cross section perpendicular to the central axis of the pulling rubber nail drill bit.

[0016] As an implementation form, the anti-overpressure part is an integral structure with the pulling rubber nail drill bit; and / or, the anti-overpressure part is cylindrical, and the diameter of the anti-overpressure part is greater than the diameter of the rubber nail.

[0017] The pulling rubber nail drill bit has the following beneficial effects: the plurality of cutting edge structures arranged on the drill bit body can form a plurality of cutting edges on the drill bit body, the plurality of cutting edge structures can improve the sharpness of the drill bit, and the drill bit can penetrate into the rubber nail with relatively small force, so that the force required for the drill bit to penetrate into the rubber nail is reduced, the rubber nail is prevented from falling into the battery due to excessive force, secondary pollution and safety hazards are reduced, the stable engagement of the spiral cutting edge structures in the rubber nail can firmly fix the rubber nail, the stability of the rubber nail during the pulling process is ensured, the rubber nail is prevented from loosening or unthreading, and the success rate of pulling is greatly improved; after the drill bit penetrates into the rubber nail, the cut rubber nail part can form strip-shaped residues between the plurality of cutting edge structures, and the strip-shaped residues can be guided out along the channel between adjacent cutting edge structures, the strip-shaped residues are easier to clean than debris, and the subsequent battery manufacturing process is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of a drill bit for removing adhesive nails according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of the structure of the adhesive nail removal device according to an embodiment of the present invention is shown;

[0021] Figure 3 A three-dimensional structural diagram of the adhesive nail removal device according to an embodiment of the present invention is shown in use.

[0022] Figure 4 This diagram shows a front view of the adhesive nail removal device according to an embodiment of the present invention in use; and

[0023] Figure 5 A side view of the device for removing adhesive nails according to an embodiment of the present invention is shown in use.

[0024] The above figures include the following reference numerals:

[0025] 1. Drill bit for removing adhesive nails; 11. Drill bit body; 12. Cutting edge structure; 13. Drill tip; 2. Overpressure protection part; 3. Striking part; 4. Guide rod; 5. Striking stop part; 6. Adhesive nail. Detailed Implementation

[0026] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] See also Figures 1 to 5 As shown, according to an embodiment of the present invention, the drill bit 1 for removing adhesive nails includes: a drill bit body 11, including a connecting end and a drilling end; a plurality of cutting edge structures 12, which are spirally arranged on the outer surface of the drill bit body 11 and extend from the connecting end of the drill bit body 11 to the drilling end, and the plurality of cutting edge structures 12 are disposed between the connecting end and the drilling end.

[0028] The drill bit 1 for removing the glue nail is provided with a plurality of blade structures 12 on the drill bit body 11, so that a plurality of cutting edges can be formed on the drill bit body 11. The plurality of blade structures 12 can improve the sharpness of the drill bit, and the drill bit can penetrate into the glue nail 6 with smaller force. The force required for the drill bit to penetrate into the glue nail 6 is reduced, thereby effectively avoiding the glue nail 6 from falling into the battery due to excessive force, reducing secondary pollution and safety hazards. The spiral blade structure 12 forms a stable occlusion in the glue nail 6, firmly fixing the glue nail 6, and ensuring the stability of the glue nail 6 during removal, avoiding loosening or breaking of the glue nail 6, thereby greatly improving the success rate of removal. After the drill bit penetrates into the glue nail 6, the spacing between the plurality of blade structures 12 allows the cut glue nail part to form a strip-shaped residue and be guided out along the channel between adjacent blade structures 12. The strip-shaped residue is easier to clean than debris, simplifying the subsequent battery manufacturing process.

[0029] In one embodiment, the drill bit body 11 is conical as a whole along the direction from the connecting end to the drilling end, and the plurality of blade structures 12 converge to form a drill tip 13 at the drilling end of the drill bit body 11.

[0030] The drill bit body 11 is conical as a whole along the direction from the connecting end to the drilling end. The conical design significantly reduces the resistance when the drill bit acts on the glue nail 6, allowing the drill tip 13 to quickly penetrate the high-hardness glue nail 6 with lower force, avoiding pushing the glue nail 6 into the battery due to excessive external force. The formation of the drill tip 13 not only improves the sharpness of the drill bit, but also optimizes the positioning and guidance during drilling, ensuring that the drill bit stably and accurately penetrates into the glue nail 6, reducing the possibility of damage to the glue nail 6. The plurality of blade structures 12 converge to form a drill tip 13 at the drilling end of the drill bit body 11. After penetrating into the glue nail 6, the converged blade structures 12 can firmly occlude the glue nail 6, forming a stable gripping structure, facilitating smooth removal of the glue nail 6 by knocking or other methods, avoiding loosening or breaking of the glue nail 6 during removal, and improving the success rate of glue nail 6 removal. The above design of the blade structure 12 reduces the wear of the drill bit during use, prolonging the service life of the drill bit.

[0031] In one embodiment, the plurality of blade structures 12 are parallel to each other at the connecting end.

[0032] The parallel blade structures 12 are provided at the connecting end of the drill bit, which can provide more stable support when starting to remove the glue nail 6, avoiding deflection of the drill bit during rotation, and ensuring the accuracy and safety of the operation.

[0033] In one embodiment, the spiral direction of the plurality of blade structures 12 is counterclockwise or clockwise, so that the rotation direction of the drill bit when penetrating into the glue nail 6 can be adjusted according to personal habits, allowing the drill bit 1 for removing the glue nail to meet the usage habits of different users and improve the user experience.

[0034] In one embodiment, the length L1 of the drill bit body 11 is less than the length L2 of the glue nail 6.

[0035] The length L1 of the drill bit body 11 is less than the length L2 of the glue nail 6, which can avoid the drill bit body 11 piercing the glue nail 6 and drilling into the inside of the secondary battery cell, damaging the cell tab or pole group, and avoiding damage to the internal structure of the battery when the glue nail 6 is removed, effectively protecting the battery.

[0036] In one embodiment, 0 < L1 < 4.5 mm, or 1 < L1 < 2.5 mm, 0 < L2 < 4.7 mm, or 1 mm < L2 < 2.7 mm.

[0037] In one embodiment, the material of the drill bit body 11 is high carbon steel, and the carbon content of the high carbon steel is 0.90wt%-1.00wt%.

[0038] The drill bit body 11 made of high carbon steel is hard and wear-resistant, and has a long service life.

[0039] For reference Figures 2 to 5 As shown in the drawings, according to the embodiment of the utility model, the glue nail pulling device includes a glue nail pulling drill 1, a guide rod 4, a knocking part 3 and a knocking stop part 5, the knocking part 3 is sleeved on the guide rod 4, the glue nail pulling drill 1 is arranged at the first end of the guide rod 4, the knocking stop part 5 is arranged at the second end of the guide rod 4 and forms a stop for the knocking movement of the knocking part 3, and the glue nail pulling drill 1 is the glue nail pulling drill 1 described in the above embodiment.

[0040] The glue nail pulling drill 1 can efficiently pierce and deeply and stably lock the high-hardness glue nail 6 under the premise of maintaining a small acting force, thanks to the spiral blade structure and the conical design. The guide rod 4 serves as a bridge for connection and force transmission, ensuring that the knocking force can be accurately transmitted to the drill bit while limiting the movement range of the drill bit to avoid damaging the internal structure of the battery. The combination of the knocking part 3 and the knocking stop part 5 allows the operator to apply a knocking force to the drill bit, which can gently and effectively remove the glue nail 6 through the inertial force generated by the knocking, avoiding the failure of the glue nail 6 caused by excessive force during the removal of the glue nail 6. The glue nail pulling device, through the ingenious structural design, realizes the removal of the glue nail 6, not only improves the success rate of the removal of the glue nail 6, but also guarantees the integrity and safety of the battery, greatly optimizing the glue nail processing link in the battery manufacturing process.

[0041] In one embodiment, the knocking part 3 is used to move along the axial direction of the guide rod 4 and knock the knocking stop part 5 multiple times after the drill bit is completely drilled into the glue nail 6, so as to remove the glue nail 6.

[0042] The drill bit is fully inserted into the glue nail 6, and then the knocking action is performed, which can avoid the failure of the nail pulling caused by the glue nail 6 being unthreaded due to the drill bit being drilled too shallow; the knocking stop portion 5 is knocked by the knocking portion 3 multiple times, which is beneficial to generate continuous inertial force and facilitate the smooth extraction of the glue nail 6.

[0043] In one embodiment, the glue nail pulling drill bit 1 is provided with an anti-overpressure portion 2 near the connecting end of the guide rod 4, the anti-overpressure portion 2 is fixedly connected with the glue nail pulling drill bit 1, is used for abutting against the outer surface of the secondary battery when the glue nail 6 is pulled out, and in the projection on the cross section perpendicular to the central axis of the glue nail pulling drill bit 1, the projection area of the anti-overpressure portion 2 has a part located outside the projection area of the glue nail pulling drill bit 1.

[0044] The part of the projection area of the anti-overpressure portion 2 located outside the projection area of the glue nail pulling drill bit 1 makes the drill bit inserted into the glue nail 6, and the part of the anti-overpressure portion 2 located outside the periphery of the glue nail pulling drill bit 1 can be used to abut and position the battery, effectively preventing the damage to the internal structure of the battery caused by the drill bit being drilled too deep.

[0045] By abutting the anti-overpressure portion 2 against the outer surface of the battery when the glue nail 6 is pulled out, the guide rod 4 is prevented from extending into the internal structure of the battery to cause short circuit of the battery, and the maximum depth of the drill bit drilled into the glue nail 6 is limited to be less than or equal to the length of the drill bit, thereby avoiding the damage to the pole group of the battery caused by the drill bit being drilled too deep.

[0046] In one embodiment, the anti-overpressure portion 2 and the glue nail pulling drill bit 1 are of an integrated structure.

[0047] The anti-overpressure portion 2 and the drill bit body 11 of the glue nail pulling drill bit 1 form an integrated structure, which can improve the connection strength of the anti-overpressure portion 2 and the glue nail pulling drill bit 1, and does not need to connect the anti-overpressure portion 2 and the glue nail pulling drill bit 1 during use, thereby reducing the structural complexity and improving the operation efficiency.

[0048] In one embodiment, the anti-overpressure portion 2 is cylindrical, and the diameter of the anti-overpressure portion 2 is greater than the diameter of the glue nail.

[0049] In the embodiment, the diameter of the anti-overpressure portion 2 is D1, the diameter of the glue nail 6 is D2, and D1>D2, which can ensure that the anti-overpressure portion 2 is large enough to abut against the battery shell around the glue nail 6.

[0050] In one embodiment, in the projection on the cross section perpendicular to the central axis of the glue nail pulling drill bit 1, the projection area of the knocking stop portion 5 and the projection area of the anti-overpressure portion 2 both have parts located outside the projection area of the central hole of the knocking portion 3.

[0051] Since the projection area of the knock stop 5 and the projection area of the overpressure prevention part 2 both have parts outside the projection area of the central hole of the knocking part 3, the knock stop 5 and the overpressure prevention part 2 both have structures that can form a stop for the knocking part 3, and when the device for pulling out the glue nail is idle, the knocking part 3 can be prevented from being separated from the guide rod 4 at the overpressure prevention part 2 or the knock stop 5.

[0052] In one embodiment, the overpressure prevention part 2 and the knock stop 5 are both cylindrical and are coaxially arranged relative to the guide rod 4.

[0053] In one embodiment, the diameter of the central hole of the knocking part 3 is D3, the projection diameter of the cross section of the knock stop 5 perpendicular to the axial direction of the guide rod 4 is D4, D3 < D1, and D3 < D4.

[0054] The cross section of the knock stop 5 perpendicular to the axial direction of the guide rod 4 can be any shape, such as a circle or a square.

[0055] In one embodiment, 3mm < D1 < 5mm, 3.12mm < D2 < 3.16mm, 5mm < D3 < 7mm, and 3mm < D4 < 4mm.

[0056] In one embodiment, the guide rod 4 and the knocking part 3 have the same shape and are both cylindrical, which can reduce the friction between the guide rod 4 and the knocking part 3 and facilitate the removal of the glue nail 6 by the inertial force.

[0057] In one embodiment, the guide rod 4 and the drill bit body 11 are in an integrated structure.

[0058] For reference Figures 3 to 5 As shown in the drawings, taking a 280Ah square aluminum shell lithium battery as an example, the steps of removing the defective glue nail 6 using the device for pulling out the glue nail include:

[0059] S1: Place the battery cell with the defective glue nail 6 on the rework operation table, use non-woven fabric to dip DMC (dimethyl carbonate) solution to wipe the electrolyte in and around the injection hole of the battery cell clean;

[0060] S2: Position the device for pulling out the glue nail on the glue nail 6 that needs to be pulled out, rotate the guide rod 4 gently, pierce the glue nail 6 with the drill tip 13, and slowly rotate the drill bit into the glue nail 6 through the multiple blade structures 12 on the drill bit body 11 to fix the drill bit in the glue nail 6;

[0061] S3: Use the knocking part 3 to knock the knock stop 5 multiple times, and slowly remove the glue nail 6 from the injection hole through the continuous inertial force generated by multiple knocking.

[0062] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0063] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0064] The preferred embodiments of the present application have been described above with the specific embodiments. The present application is not limited to the above embodiments, and various changes and modifications can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A drill bit for removing adhesive nails, characterized in that, include: Drill bit body (11); Multiple cutting edge structures (12) are arranged in a spiral shape on the outer surface of the drill bit body (11); The drill bit body (11) includes a connecting end and a drilling end, and a plurality of the cutting edge structures (12) are disposed between the connecting end and the drilling end; Along the direction from the connecting end to the drilling end, the drill bit body (11) is generally conical, and multiple cutting edge structures (12) converge at the drilling end to form a drill tip (13).

2. The drill bit for removing adhesive nails according to claim 1, characterized in that, The plurality of blade structures (12) are arranged to be parallel to each other at the connection end.

3. The drill bit for removing adhesive nails according to claim 1, characterized in that, The spiral direction of the plurality of blade structures (12) is either counterclockwise or clockwise.

4. The drill bit for removing adhesive nails according to claim 1, characterized in that, The length L1 of the drill bit body (11) is less than the length L2 of the rubber nail.

5. The drill bit for removing adhesive nails according to claim 1, characterized in that, The drill bit body (11) is made of high carbon steel, and the carbon content of the high carbon steel is 0.90wt%-1.00wt%.

6. A device for removing adhesive nails, characterized in that, The device includes a drill bit (1) for removing adhesive nails as described in any one of claims 1 to 5, a guide rod (4), a striking part (3), and a striking stop part (5). The striking part (3) is sleeved on the guide rod (4), the drill bit (1) for removing adhesive nails is disposed at the first end of the guide rod (4), and the striking stop part (5) is disposed at the second end of the guide rod (4) and forms a stop for the striking movement of the striking part (3).

7. The device for removing adhesive nails according to claim 6, characterized in that, The connecting end of the glue-removing nail drill bit (1) is provided with an overpressure protection part (2). When projected onto a cross-section perpendicular to the central axis of the glue-removing nail drill bit (1), the projection area of ​​the overpressure protection part (2) includes a portion located outside the projection area of ​​the glue-removing nail drill bit (1).

8. The device for removing adhesive nails according to claim 7, characterized in that, The overpressure protection part (2) and the drill bit (1) for removing the glue nail are an integral structure; and / or, the overpressure protection part (2) is cylindrical, and the diameter of the overpressure protection part (2) is larger than the diameter of the glue nail.

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