welding equipment

Abstract

A welding apparatus according to one embodiment of the present invention is an apparatus for welding a plurality of metal materials, the welding apparatus including: an anvil on which the plurality of metal materials are placed; a horn located on the anvil and including a plurality of protrusions protruding toward the anvil; and a processor for vibrating the horn so as to form holes through the plurality of metal materials.

Description

[Technical Field]

[0001] The present invention relates to a welding device.

[0002] This application claims priority based on Korean Patent Application No. 10-2023-0059969, filed on May 9, 2023, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings thereof. [Background technology]

[0003] As demand for portable electronic products such as laptops, video cameras, and mobile phones has grown rapidly and robots, electric vehicles, and other products have become commercially available, active research is being conducted into high-performance secondary batteries that can be repeatedly charged and discharged.

[0004] Currently commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are attracting attention due to their advantages of being free to charge and discharge as they have almost no memory effect compared to nickel-based secondary batteries, as well as their extremely low self-discharge rate and high energy density.

[0005] Generally, lithium secondary batteries can be classified into can-type secondary batteries in which an electrode assembly is housed in a metal can and pouch-type secondary batteries in which an electrode assembly is housed in a pouch made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0006] In addition, the electrode tabs provided on the plurality of electrode assemblies may be joined by welding, and after the plurality of electrode tabs are welded, they may be connected to the electrode leads by welding.

[0007] In this case, the electrode tabs can be joined through two welding steps. The electrode tabs can be primarily joined by ultrasonic welding. Then, the electrode tabs can be secondarily joined by laser welding. When the electrode tabs are joined by ultrasonic welding, it is necessary to quickly and accurately detect any welding defects. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention is directed to overcoming the above-mentioned problems and other problems.

[0009] In particular, it is an object of the present invention to provide a welding device including a sensing unit that can quickly and accurately detect a welding defect.

[0010] Another object of the present invention is to provide a welding apparatus that is easy to maintain and repair. [Means for solving the problem]

[0011] In order to achieve the above object, a welding apparatus according to one aspect of the present invention is an apparatus for welding a plurality of metal materials, and includes an anvil on which the plurality of metal materials are placed, a horn located on the anvil and including a plurality of protrusions protruding toward the anvil, and a processor that vibrates the horn so as to form holes that penetrate the plurality of metal materials.

[0012] The welding device may further include a vision sensor that senses the hole.

[0013] The processor may also vibrate the plurality of protrusions so that they describe a circular locus.

[0014] The plurality of protrusions may include welding protrusions that weld the plurality of metal materials together, and first piercing protrusions that form holes that penetrate the plurality of metal materials.

[0015] The protruding length of the first piercing projection may be configured to be longer than the protruding length of the welding projection.

[0016] The anvil may also include a receiving portion facing the first piercing projection.

[0017] Additionally, the anvil may be configured to further include a cutting blade formed around the housing.

[0018] The anvil may be configured so that at least some of the plurality of metal materials are housed in the housing portion.

[0019] The cutting blade may also be configured to be replaceable.

[0020] The anvil may also include a second piercing protrusion that protrudes toward the horn and faces the first piercing protrusion.

[0021] The horn may further include a groove formed around the first piercing protrusion.

[0022] The horn may also be configured to form protrusions around the holes in the metal material.

[0023] The second piercing projection may be configured to be replaceable.

[0024] Furthermore, a battery cell according to another aspect of the present invention includes a plurality of metal materials welded by the welding device according to an aspect of the present invention. [Effects of the Invention]

[0025] According to at least one embodiment of the present invention, welding defects can be detected quickly and accurately.

[0026] In accordance with at least one embodiment of the present invention, holes may be formed in a plurality of metallic materials to detect weld defects.

[0027] According to at least one embodiment of the present invention, it is possible to provide a welding device including a sensing unit that can quickly and accurately sense a welding defect.

[0028] According to at least one of the embodiments of the present invention, it is possible to provide a welding device that is easy to maintain and repair.

[0029] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical concept of the present invention. Therefore, the present invention should not be interpreted as being limited to only the matters described in the drawings. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a diagram illustrating an example of a battery cell. [Figure 2] FIG. 2 is a diagram showing a part of the cross-sectional configuration taken along the line AA' in FIG. [Figure 3] 1 is a diagram illustrating a welding device according to an embodiment of the present invention. [Figure 4] 10A and 10B are diagrams illustrating an example of vibration transmission by a horn of a welding device according to an embodiment of the present invention. [Figure 5] 3A to 3C are diagrams illustrating a process of forming holes in a plurality of metal materials by a welding apparatus according to an embodiment of the present invention. [Figure 6] 3A to 3C are diagrams illustrating a process of forming holes in a plurality of metal materials by a welding apparatus according to an embodiment of the present invention. [Figure 7] 1 is a diagram showing a state in which welding is performed by a welding device according to an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing a welding device according to another embodiment of the present invention. [Figure 9] FIG. 10 is a diagram showing a welding device according to yet another embodiment of the present invention. [Figure 10] 1 is a diagram showing an example of inspecting welding quality using a welding device according to an embodiment of the present invention; [Figure 11] FIG. 10 is a diagram showing a welding device according to yet another embodiment of the present invention. [Figure 12] FIG. 10 is a diagram showing a welding device according to yet another embodiment of the present invention. [Figure 13]10A and 10B are diagrams illustrating a state in which welding is performed by a welding device according to still another embodiment of the present invention. [Figure 14] FIG. 10 is a diagram showing a welding device according to yet another embodiment of the present invention. [Figure 15] 10 is a view showing a first piercing protrusion of a welding device according to still another embodiment of the present invention. FIG. [Figure 16] FIG. 10 is a diagram showing a welding device according to yet another embodiment of the present invention. [Figure 17] 10A and 10B are diagrams illustrating an example of inspecting welding quality using a welding device according to yet another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in the specification and claims should not be construed as being limited to their ordinary and dictionary meanings, but should be construed as having meanings and concepts corresponding to the technical ideas of the present invention, in accordance with the principle that the inventors themselves can appropriately define the concepts of terms in order to best explain the invention.

[0032] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can be substituted therefor at the time of this application.

[0033] FIG. 1 is a diagram showing an example of a battery cell 600, FIG. 2 is a diagram showing a portion of a cross-sectional configuration along section line A-A' in FIG. 1, and FIG. 3 is a diagram showing a welding apparatus according to an embodiment of the present invention. Referring to FIGS. 1 to 3, the welding apparatus according to an embodiment of the present invention includes an anvil 100, a horn 200, and a processor (not shown). The battery cell 600 may refer to a secondary battery. The battery cell 600 may also be a pouch-type secondary battery. The battery cell 600 may include a plurality of electrode assemblies 630. The electrode assembly 630 may be formed by coating a metal electrode current collector with an electrode active material. A portion of the electrode current collector may be extended to form an electrode tab 610. The electrode tab 610 may be provided on each electrode assembly 630. The plurality of electrode tabs 610 may be joined by welding. The plurality of electrode tabs 610 may also be joined to an electrode lead 620. The battery cell 600 may be configured to include a case 640 that encases the electrode assembly 630, the electrode tabs 610, and the electrode leads 620. The case 640 may be configured to encase at least a portion of the electrode leads 620. The electrode tabs 610 may be referred to as a metal foil 610 or a metal material 610. The electrode tabs 610 may be joined through ultrasonic welding and then laser welding.

[0034] The welding device may be configured to weld multiple metal materials 610. The multiple metal materials 610 may be multiple electrode tabs 610 placed one on top of the other or multiple stacked electrode tabs 610. The welding device may ultrasonically weld the multiple electrode tabs 610 together.

[0035] The anvil 100 may be configured to receive a plurality of metal materials 610. For example, the anvil 100 may be configured to include a large surface on its upper portion, allowing the metal materials to be received on such a large surface. Furthermore, the anvil 100 may be configured to stably support the plurality of metal materials 610 even during welding.

[0036] The horn 200 may be positioned on the anvil 100. The horn 200 may be configured to include a plurality of protrusions 220, 230 that protrude toward the anvil 100. The plurality of protrusions 220, 230 may contact the plurality of metal materials 610 and transmit ultrasonic vibrations.

[0037] The processor may be configured to operate and control the welding device, and may vibrate the horn 200 to form holes 611 through the plurality of metallic materials 610.

[0038] According to this configuration of the present invention, the welding apparatus can weld the plurality of metal materials 610 and simultaneously form holes penetrating the plurality of metal materials 610. This allows a user or a processor to determine whether the plurality of metal materials 610 have been successfully welded by confirming that holes penetrating the plurality of metal materials 610 have been formed. For example, if no holes penetrating the plurality of metal materials 610 are confirmed, it can be determined that the welding of the plurality of metal materials 610 has not been successful.

[0039] According to this configuration of the present invention, a user or a processor can clearly and easily determine whether the welding of the plurality of metal materials 610 was successful.

[0040] 4 is a diagram showing an example of vibration transmission by the horn 200 of a welding apparatus according to an embodiment of the present invention. Referring to FIGS. 3 and 4, a welding apparatus according to an embodiment of the present invention may be configured such that a plurality of protrusions 220, 230 vibrate while tracing a circular trajectory. In particular, while FIG. 4 shows one protrusion 230 vibrating in a circular trajectory, another protrusion 220 may also vibrate in a circular trajectory. Furthermore, the circular vibration of the protrusions 220, 230 may be controlled by a processor.

[0041] Conventional welding equipment is configured to form a straight weld line. In contrast, with the configuration of the present invention, the multiple welding protrusions 220, 230 are configured to form a circular trajectory, which can reduce the number of welding spots or indentations compared to a straight weld line. This allows the multiple protrusions 220, 230 to be spaced apart more widely, increasing the degree of freedom in changing the shape of each protrusion 220, 230.

[0042] 5 and 6 are views showing a process of forming holes in a plurality of metal materials 610 by a welding apparatus according to an embodiment of the present invention. Referring to FIGS. 3 to 6, the plurality of protrusions 220, 230 of the welding apparatus according to an embodiment of the present invention may be configured to include a welding protrusion 220 that welds the plurality of metal materials 610 together, and a first piercing protrusion 230 that forms a hole 611 that penetrates the plurality of metal materials 610.

[0043] When ultrasonic vibrations are generated from the horn 200, the welding protrusions 220 may weld the plurality of metal materials 610 together. At the same time, the first piercing protrusions 230 may form holes 611 that penetrate the plurality of metal materials 610. There may be at least one welding protrusion 220 and one first piercing protrusion 230. The first piercing protrusion 230 may be located adjacent to the welding protrusion 220.

[0044] According to this configuration of the present invention, welding and hole formation are performed simultaneously, which improves the reliability of determining whether welding is successful based on whether a hole is formed or the size of the formed hole.

[0045] 3 to 6, the protruding length h2 of the first piercing protrusion 230 of the welding device according to one embodiment of the present invention may be configured to be longer than the protruding length h1 of the welding protrusion 220.

[0046] The body 210 of the horn 200 may be positioned to face the anvil 100. The welding protrusion 220 and the first piercing protrusion 230 may be formed on the body 210 of the horn 200. The body 210 of the horn 200 has one surface facing the anvil 100, and the one surface may be flat. The body 210 of the horn 200 and the anvil 100 may be configured to maintain a constant distance during welding. The welding protrusion 220 and the first piercing protrusion 230 may come into contact with a plurality of metal materials 610 during welding.

[0047] According to this configuration of the present invention, the first piercing protrusion 230 can press the plurality of metal materials 610 downward during welding. At least a portion of the plurality of metal materials 610 can be pressed downward by the first piercing protrusion 230. Alternatively, the first piercing protrusion 230 can form a hole 611 penetrating the plurality of metal materials 610.

[0048] 3 to 6, the anvil 100 of the welding device according to one embodiment of the present invention may be configured to include a receiving portion 111 facing the first piercing protrusion 230.

[0049] The receiving portion 111 may be formed on the upper surface of the body 110 of the anvil 100. When welding is performed, the distance between the receiving portion 111 and the first piercing protrusion 230 may be reduced. During welding, at least a portion of the plurality of metal materials 610 pushed by the first piercing protrusion 230 may be configured to be received in the receiving portion 111.

[0050] According to this configuration of the present invention, the receiving portion 111 receives at least a portion of the plurality of metal materials 610 while welding is being performed, thereby facilitating the formation of the holes 611.

[0051] 3 to 6, the anvil 100 of the welding device according to one embodiment of the present invention may be configured to further include a cutting blade 120 formed around the receiving portion 111.

[0052] The cutting blade 120 may be formed on the inside along the periphery of the receiving portion 111. The cutting blade 120 may cut at least a portion of the plurality of metal materials 610. Referring to FIGS. 5 and 6 , during welding, at least a portion of the plurality of metal materials 610 may be pressed downward by the first piercing protrusion 230. At this time, the pressed portion 612 may be cut by the cutting blade 120. As the first piercing protrusion 230 vibrates while tracing a circular trajectory, a cutting line may be formed along the circular trajectory. As a result, at least a portion of the plurality of metal materials 610 may be separated in the shape of a circular chip 612, and a circular hole 611 may be formed penetrating the plurality of metal materials 610. The portion separated from the plurality of metal materials 610 may be referred to as a chip 612 or a scrap 612.

[0053] According to this configuration of the present invention, at least a portion of the plurality of metal materials 610 can be cut during welding, which makes it possible to easily determine whether the welding has been successful and improves the reliability of the determination.

[0054] 7 is a view showing welding performed by a welding apparatus according to an embodiment of the present invention. Referring to FIG. 7, the anvil 100 of the welding apparatus according to an embodiment of the present invention may be configured so that at least a portion of the plurality of metal materials 610 is accommodated in a receiving portion 111. The receiving portion 111 may be formed at a position facing the first piercing protrusion 230. A portion of the plurality of metal materials 610 pushed by the first piercing protrusion 230 may be accommodated in the receiving portion 111. In addition, a chip 612 cut by the cutting blade 120 may fall downward by gravity and be accommodated in the receiving portion 111.

[0055] According to this configuration of the present invention, chips 612 generated during welding are stored in storage portion 111 and are separated from other components of the welding device. This makes it possible to prevent chips 612 from causing poor welding or errors.

[0056] 8 is a diagram showing a welding apparatus according to another embodiment of the present invention. Referring to FIG. 8, the welding apparatus according to one embodiment of the present invention may be configured to further include a weight measuring unit 400. The weight measuring unit 400 may be configured to be located in the receiving portion 111 of the anvil 100. The processor may be configured to sense the weight measured by the weight measuring unit 400. For example, the weight measuring unit 400 may be a scale 400.

[0057] According to this configuration of the present invention, chips 612 generated during welding can be placed on the scale 400. Therefore, the weight measuring unit 400 can sense the weight of the chips 612. As a result, while multiple welding operations are performed, the processor can sense an increase in the weight measured by the weight measuring unit 400 and detect the generation or addition of chips 612.

[0058] Furthermore, according to this configuration of the present invention, the processor can detect that a welding defect has occurred if it is detected that the weight of the scale does not change while multiple welding operations are performed.

[0059] 9 is a view showing a welding apparatus according to yet another embodiment of the present invention. Referring to FIG. 9, the welding apparatus according to an embodiment of the present invention may be configured to further include a suction device 500. The receiving portion 111 of the anvil 100 may be formed to penetrate the body 110. The suction device 500 may be configured to be connected to or communicate with one end of the receiving portion 111. Chips 612 generated during welding may be sucked into the suction device 500 through the receiving portion 111.

[0060] According to this configuration of the present invention, chips 612 generated during welding can be separated from other components of the welding device by being sucked up by suction device 500. In addition, there is an advantage that chips 612 do not accumulate inside storage section 111, so there is no need to empty the inside of storage section 111.

[0061] FIG. 10 is a diagram illustrating an example of inspecting welding quality using a welding apparatus according to an embodiment of the present invention. Referring to FIG. 10, the welding apparatus according to an embodiment of the present invention may further include a vision sensor 300 that detects a hole 611. The vision sensor 300 may detect the hole 611 formed in the plurality of metal materials 610 by the first piercing protrusion 230. The vision sensor 300 may detect whether the hole 611 has penetrated through the metal materials 610. The processor may determine that the welding is defective if the hole 611 does not penetrate through the metal materials 610, as shown in FIG. 10(a). The processor may also determine that the welding is successful if the hole 611 penetrates through the metal materials 610, as shown in FIG. 10(b).

[0062] According to this configuration of the present invention, it is possible to quickly and accurately determine whether or not the welding was successful.

[0063] 11 is a diagram showing a welding apparatus according to yet another embodiment of the present invention. Referring to FIG. 11, a cutting blade 120a of the welding apparatus according to yet another embodiment of the present invention may be configured to be replaceable. The cutting blade 120a may be detachably coupled or fastened to the receiving portion 111 of the anvil 100. The cutting blade 120a may be configured to have an internal space. Chips 612 generated during welding may be accommodated or collected in the internal space formed by the cutting blade 120a.

[0064] This configuration of the present invention can improve the durability of the welding device. The cutting blade 120a can wear out faster than other components of the welding device. If the cutting blade 120a wears out, the tip 612 may not form smoothly, which can reduce the reliability of determining whether the welding was successful. However, by making the cutting blade 120a replaceable, maintenance of the welding device is easier.

[0065] Fig. 12 is a view showing a welding apparatus according to yet another embodiment of the present invention, Fig. 13 is a view showing welding performed by the welding apparatus shown in Fig. 12, and Fig. 14 is a view showing a welding apparatus according to yet another embodiment of the present invention. Referring to Figs. 12 to 14, an anvil 100 of a welding apparatus according to an embodiment of the present invention may be configured to include a second piercing protrusion 130 that protrudes toward a horn 200 and faces a first piercing protrusion 230.

[0066] As the welding progresses, the plurality of metal materials 610 located between the first piercing protrusion 230 and the second piercing protrusion 130 may be extruded to the periphery. Furthermore, the first piercing protrusion 230 and the second piercing protrusion 130 may come into contact or abut against each other, thereby forming holes 611 that penetrate the plurality of metal materials 610. At this time, the extruded portions of the plurality of metal materials 610 may move around the first piercing protrusion 230.

[0067] According to this configuration of the present invention, it is possible to form holes 611 that penetrate through a plurality of metal materials 610. Furthermore, even if holes 611 that penetrate through a plurality of metal materials 610 are formed, chips 612 are not generated.

[0068] 15 is a view showing a first piercing protrusion 230 of a welding apparatus according to yet another embodiment of the present invention. Referring to FIGS. 12 to 15, a horn 200 of a welding apparatus according to an embodiment of the present invention may further include a groove 211 formed around the first piercing protrusion 230. The groove 211 may be formed in the body 210 of the horn 200. The groove 211 may be formed upward. The groove 211 may be formed around the first piercing protrusion 230 or adjacent to the first piercing protrusion 230. The groove 211 may also extend along the periphery of the first piercing protrusion 230. The groove 211 may be formed in a circle surrounding the first piercing protrusion 230.

[0069] According to this configuration of the present invention, the portions of the plurality of metal materials 610 extruded by the first piercing protrusion 230 and the second piercing protrusion 130 can move along the surface of the first piercing protrusion 230 and be accommodated in the groove 211. By accommodating the plurality of metal materials 610 in the groove 211, the plurality of metal materials 610 are separated from other components of the welding device. This makes it possible to prevent poor welding or errors caused by the extruded plurality of metal materials 610.

[0070] 12 to 15 , horn 200 of a welding apparatus according to an embodiment of the present invention may be configured to form protrusions 613 around holes 611 of a plurality of metal materials 610. Portions of the plurality of metal materials 610 pushed out by first piercing projection 230 and second piercing projection 130 may be accommodated in grooves 211. This allows protrusions 613 to be formed along the periphery of holes 611 that penetrate through the plurality of metal materials 610. That is, grooves 211 may form protrusions 613.

[0071] According to this configuration of the present invention, the processor can determine whether welding was successful or not by detecting the protrusion 613. By detecting the hole 611 penetrating the plurality of metal materials 610 and the protrusion 613, the processor can improve the accuracy of determining the welding quality.

[0072] 12 to 15, horn 200 of a welding apparatus according to an embodiment of the present invention may be configured to further include a stopper 212. Stopper 212 may be formed on body 210 and may be formed to protrude downward from body 210. Stopper 212 may be formed along the periphery of groove 211. Stopper 212 may extend to surround groove 211. Stopper 212 may be formed in a circular shape surrounding groove 211 or first piercing projection 230.

[0073] According to this configuration of the present invention, the portions of the plurality of metal materials 610 extruded by the first piercing protrusion 230 and the second piercing protrusion 130 can move along the surface of the first piercing protrusion 230 and be accommodated in the groove 211. The stopper 212 can restrict the plurality of metal materials 610 from spreading too widely. In addition, the stopper 212 can guide the plurality of metal materials 610 so that they are stably accommodated in the groove 211. By accommodating the plurality of metal materials 610 in the groove 211, the plurality of metal materials 610 are separated from other components of the welding device. This can prevent poor welding or errors caused by the extruded plurality of metal materials 610.

[0074] 16 is a diagram showing a welding device according to yet another embodiment of the present invention. Referring to FIG. 16, the second piercing protrusion 130a of the welding device according to yet another embodiment of the present invention may be configured to be replaceable. The second piercing protrusion 130a may be detachably coupled or fastened to the receiving portion 111 of the anvil 100.

[0075] This configuration of the present invention can improve the durability of the welding device. The second piercing protrusion 130a may wear out faster than other components of the welding device due to contact or friction with the first piercing protrusion 230. If the second piercing protrusion 130a wears out, the hole 611 may not be formed smoothly, which may reduce the reliability of determining whether welding is successful. However, by making the second piercing protrusion 130a replaceable, maintenance of the welding device is easier.

[0076] FIG. 17 is a diagram illustrating an example of inspecting welding quality using a welding apparatus according to another embodiment of the present invention. Referring to FIG. 17, the welding apparatus according to the embodiment of the present invention may further include a vision sensor 300 that detects a hole 611. The vision sensor 300 may detect the hole 611 formed in the plurality of metal materials 610 by the first piercing protrusion 230 and the second piercing protrusion 130. The vision sensor 300 may detect whether the hole 611 has penetrated through the metal materials 610. The processor may determine that the welding is defective if the hole 611 does not penetrate through the metal materials 610, as shown in FIG. 17(a). The processor may also determine that the welding is successful if the hole 611 penetrates through the metal materials 610, as shown in FIG. 17(b).

[0077] According to this configuration of the present invention, it is possible to quickly and accurately determine whether or not the welding was successful.

[0078] A battery cell 600 according to another embodiment of the present invention includes a plurality of metal materials 610 welded by a welding apparatus according to an embodiment of the present invention. Specifically, the plurality of metal materials 610 welded by the welding apparatus of the present invention may be a plurality of electrode tabs 610.

[0079] Meanwhile, although terms indicating directions such as up, down, left, right, front, and rear are used in this specification, it will be obvious to those skilled in the art that these terms are used for the convenience of explanation and may vary depending on the position of the object in question, the position of the observer, etc.

[0080] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited to these, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the technical spirit of the present invention and the equivalent scope of the claims. [Explanation of symbols]

[0081] 100 Anvil 110 Body 111 Storage unit 120 cutting blade 130 2nd penetration protrusion 200 Horn 210 Body 211 Groove 212 Stopper 220 Welding protrusion 230 1st penetration protrusion 300 Vision Sensor 400 Weight measurement section, scales 500 suction machine 600 battery cells 610 Electrode tabs, metal materials, metal foils 611 hole 612 chips 613 Protrusion 620 Electrode Lead 630 Electrode assembly 640 cases

Claims

1. A welding device for welding a plurality of metal materials, an anvil on which a plurality of the metal materials are placed; a horn located on the anvil and including a plurality of protrusions projecting toward the anvil; a processor for vibrating the horn to form a plurality of holes through the metal material.

2. The welding device of claim 1 further comprising a vision sensor for sensing said hole.

3. The welding device of claim 1 , wherein the processor vibrates the plurality of protrusions so as to describe a circular trajectory.

4. The plurality of protrusions include: a welding projection for welding a plurality of the metal materials together; The welding device of claim 1 , further comprising: a first piercing projection that forms a plurality of holes through the metallic material.

5. The welding device according to claim 4 , wherein the protruding length of the first piercing projection is longer than the protruding length of the welding projection.

6. The welding device according to claim 4 , wherein the anvil includes a receiving portion facing the first piercing projection.

7. The welding device of claim 6 , wherein the anvil further includes a cutting blade formed around the housing.

8. The welding device according to claim 6 , wherein the anvil is configured so that at least some of the plurality of metal materials are accommodated in the accommodation portion.

9. The welding device of claim 7 , wherein the cutting blade is configured to be replaceable.

10. The welding device of claim 4 , wherein the anvil includes a second piercing projection that projects toward the horn and faces the first piercing projection.

11. The welding apparatus of claim 10 , wherein the horn further includes a groove formed around the first piercing projection.

12. The welding device of claim 10 , wherein the horn is configured to form protrusions around a plurality of holes in the metallic material.

13. The welding device according to claim 10 , wherein the second piercing projection is configured to be replaceable.

14. A battery cell comprising a plurality of metal materials welded by the welding apparatus of any one of claims 1 to 13.

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