Welding mask jig

Abstract

A welding mask jig according to an embodiment of the present invention may include a main body, a housing groove recessed to a predetermined depth from one surface of the main body and configured to accommodate a current collector plate, and at least one through hole formed through from the other surface of the main body to the housing groove and configured to allow a laser beam to be incident on the current collector plate located within the housing groove. The housing groove may include a first groove communicating with the through hole and a second groove extending radially outward from the first groove.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0074316 filed on June 9, 2023 and Korean Patent Application No. 10-2024-0073997 filed on June 5, 2024, and all the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference in their entirety.

[0002] The present invention relates to a mask jig for welding, and more particularly, to a mask jig used for welding a current collector plate.

Background Art

[0003] Secondary batteries, which are highly applicable according to product groups and have electrical characteristics such as a high energy density, are widely applied not only to portable devices but also to electric vehicles (EVs), hybrid electric vehicles (HEVs), etc. that are driven by an electric drive source.

[0004] Such secondary batteries not only have the primary advantage of significantly reducing the use of fossil fuels but also have the advantage of generating no by-products associated with energy use, and thus are environmentally friendly and are attracting attention as a new energy source for improving energy efficiency.

[0005] Examples of currently widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. A plurality of batteries may be connected in series and / or in parallel to form a battery module or a battery pack. The number of batteries and the form of electrical connection included in the battery module or battery pack can be variously set according to the required output voltage and / or charge-discharge capacity.

[0006] Known types of secondary battery cells include cylindrical, prismatic, and pouch-type batteries. In the case of cylindrical batteries, an insulating separator is interposed between the positive and negative electrodes, which is then wound up to form a jelly-roll-like electrode assembly. This assembly, along with the electrolyte, is then inserted into a battery case to constitute the battery. The battery case and the cap sealing the opening of the battery case can exhibit opposite polarity and can act as the positive and negative terminals, respectively. For example, the positive terminal may be the cap, and the negative terminal may be the battery case. However, the reverse configuration is also possible.

[0007] Electrode tabs can be provided at both axial ends of the electrode assembly, and current collector plates can be welded to the electrode tabs, allowing for electrical connection to the battery can and cap via the current collector plates. It is well known that a mask jig can be used when welding the current collector plates to the electrode tabs. [Overview of the project] [Problems that the invention aims to solve]

[0008] One problem that the present invention aims to solve is to provide a welding mask jig that can perform laser welding on a current collector plate including a lead portion. Another problem that the present invention aims to solve is to provide a welding mask jig that allows the lead portion of a current collector plate to be bent at a pre-set position. [Means for solving the problem]

[0009] A welding mask jig according to an embodiment of the present invention may include a main body, a housing groove recessed to a predetermined depth from one surface of the main body and configured to accommodate a current collector plate, and at least one through hole formed through from the other surface of the main body to the housing groove and configured to allow a laser beam to be incident on the current collector plate located within the housing groove. The housing groove may include a first groove communicating with the through hole and a second groove extending radially outward from the first groove.

[0010] A projection can be formed at the inner end of the second groove, configured to press against the lead portion of the current collector plate. The projection can be formed parallel to the width of the second groove. The length of the projection may be more than half the width of the second groove.

[0011] The end of the projection may be located on the same plane as the inner surface of the first groove, or it may protrude beyond the inner surface of the first groove. The inner end of the second groove can be located inward from the inner circumference of the first groove.

[0012] The first groove is configured to accommodate the main body that is welded to the electrode assembly in the current collector plate, and the second groove can be configured to accommodate the lead portion that extends radially outward from the main body in the current collector plate.

[0013] The second groove can be formed to be deeper than the first groove. The second groove may include a section in which the depth increases as it moves away from the inner end of the second groove.

[0014] The inner end of the second groove may be located on the same plane as the inner surface of the first groove, or it may protrude beyond the inner surface of the first groove. The outer end of the second groove can be opened. [Effects of the Invention]

[0015] According to a preferred embodiment of the present invention, the housing groove of the mask jig may include a second groove corresponding to the lead portion of the current collector plate. This prevents the lead portion of the current collector plate from interfering with the body of the mask jig during the welding process.

[0016] The projection formed in the second groove of the mask jig or the inner end of the second groove can apply pressure to the lead portion of the current collector plate. This allows the lead portion to be bent at the correct position, thereby improving process efficiency.

[0017] In addition, there is an advantage that a bending line can be formed on the lead portion in the welding process using the mask jig without performing another process of forming a bending portion on the lead portion. In addition, effects that can be easily predicted by those skilled in the art from the configuration according to the preferred embodiment of the present invention can be included.

Brief Description of the Drawings

[0018] The following drawings attached to this specification illustrate the preferred embodiments of the present invention and serve to further understand the technical idea of the present invention together with the detailed description of the invention described later. Therefore, the present invention should not be construed as being limited only to the matters described in the drawings. [Figure 1] It is a cross-sectional view schematically showing the inside of a battery cell. [Figure 2] It is a plan view of the first current collector shown in FIG. 1. [Figure 3] It is a bottom view showing both the mask jig for welding and the current collector according to an embodiment of the present invention. [Figure 4] It is a cross-sectional view taken along the line A-A' of FIG. 3. [Figure 5] It is a cross-sectional view showing both the mask jig for welding and the current collector according to another embodiment of the present invention. [Figure 6] It is a cross-sectional view showing both the mask jig for welding and the current collector according to another embodiment of the present invention. [Figure 7] It is a cross-sectional view showing both the mask jig for welding and the current collector according to still another embodiment of the present invention.

Modes for Carrying Out the Invention

[0019] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention may be realized in various different forms and is not limited or restricted by the following embodiments.

[0020] To clearly explain the present invention, detailed descriptions of parts unrelated to the explanation or related known technologies that unnecessarily obscure the gist of the present invention are omitted. In this specification, when attaching reference numerals to the components of each drawing, the same or similar components throughout the specification shall be given the same or similar reference numerals.

[0021] Also, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. The inventors should interpret them in accordance with the meaning and concept consistent with the technical idea of the present invention, following the principle that they can appropriately define the concept of the terms in order to explain their invention in the best way.

[0022] FIG. 1 is a cross-sectional view schematically showing the inside of a battery cell, and FIG. 2 is a plan view of the first current collector shown in FIG. 1. The battery cell 1 may be a cylindrical secondary battery. The battery cell 1 may include an electrode assembly 10 and a battery can 20 that houses the electrode assembly 10.

[0023] The electrode assembly 10 may include a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. Further, the electrode assembly 10 may be provided with a first electrode tab 11 connected to either the positive electrode or the negative electrode, and a second electrode tab 12 connected to the other of the positive electrode and the negative electrode.

[0024] More specifically, the electrode assembly 10 may be of the jelly-roll type. The electrode assembly 10 can be manufactured by winding a laminate in which a positive electrode, a separator, a negative electrode, and a separator are sequentially laminated. The ratio of the height to the diameter of the electrode assembly 10 is preferably 1 or more, but is not limited thereto. A hollow C formed long in the height direction can be formed at the center of the electrode assembly 10. In order to insulate the electrode assembly 10 from the inner circumference of the battery can 20, a separator can be positioned on the outermost side of the electrode assembly 10.

[0025] The first electrode tab 11 and the second electrode tab 12 can be provided at both ends of the electrode assembly 10 in the axial direction. More specifically, the blank portion of either the positive or negative electrode can be located at one end of the electrode assembly 10 and can function as the first electrode tab 11. The blank portion of the other of the positive or negative electrode can be located at the other end of the electrode assembly 10 and can function as the second electrode tab 12.

[0026] Each electrode tab 11, 12 may extend along the winding direction of the electrode assembly 10. Alternatively, each electrode tab 11, 12 may include multiple foil-flags arranged along the winding direction of the electrode assembly 10.

[0027] Each electrode tab 11, 12 can be bent toward the hollow C of the electrode assembly 10. The bent first electrode tab 11 can define the upper surface of the electrode assembly 10, and the bent second electrode tab 12 can define the lower surface of the electrode assembly 10.

[0028] The first electrode tab 11, when bent, can be connected to the first current collector plate 100, and the second current collector plate 101, when bent, can be connected to the second electrode tab 12. The electrode assembly 10 can be housed in the battery can 20 with the current collector plates 100 and 101 connected to the respective electrode tabs 11 and 12.

[0029] For example, the first electrode tab 11 may be the blank portion of the positive electrode, and the second electrode tab 12 may be the blank portion of the negative electrode. In this case, the first current collector plate 100 may be named the positive electrode current collector plate, and the second current collector plate 101 may be named the negative electrode current collector plate.

[0030] The battery can 20 may be an open cylindrical can with an opening formed at one end. The following explanation will be based on the case where the opening is located on the upper side, as shown in Figure 1.

[0031] A bottom surface can be provided at the lower end of the battery can 20, and an opening can be formed at the upper end. The electrode assembly 10 can be housed in the battery can 20 together with the electrolyte through the opening.

[0032] The battery casing 20 may be made of a conductive material such as metal. The battery casing 20 may be electrically connected to the second electrode tab 12 via a second current collector plate 101. More specifically, the second current collector plate 101 may be welded to the second electrode tab 12 and the inner bottom surface of the battery casing 20. Thus, the battery casing 20 may have the same polarity as the second electrode tab 12.

[0033] A beading portion 21 can be formed in the battery can 20. The beading portion 21 can be formed by press-fitting the periphery of the battery can 20 radially inward. The inner diameter of the beading portion 21 may be smaller than the inner diameter of the battery can 20. The beading portion 21 can be formed with the electrode assembly 10 housed in the battery can 20. The electrode assembly 10 can be positioned between the bottom surface of the battery can 20 and the beading portion 21 in the height direction of the battery can 20. The beading portion 21 can prevent the electrode assembly 10 from detaching from the open portion of the battery can 20.

[0034] A crimped portion 22 can be formed on the battery can 20. The crimped portion 22 can be formed adjacent to the beading portion 21. The crimped portion 22 can be formed by bending the upper end of the circumferential surface of the battery can 20 radially inward. The inner circumference of the crimped portion 22 can define the open portion of the battery can 20. The crimped portion 22, together with the beading portion 21, can restrain the gasket 40, which will be described later.

[0035] The battery cell 1 may include a first current collector plate 100 that electrically connects the terminal 30 to the first electrode tab 11 of the electrode assembly 10. The battery cell 1 may also include a second current collector plate 101 that electrically connects the battery can 20 to the second electrode tab 12 of the electrode assembly 10.

[0036] The battery cell 1 may include terminals 30 that exhibit the opposite polarity to the battery can 20. The terminals 30, like the battery can 20, may be made of a conductive material such as metal. The terminals 30 may be insulated from the battery can 20 by a gasket 40. The terminals 30 may seal the open portion of the battery can 20.

[0037] Terminal 30 can be electrically connected to the first electrode tab 11 via the first current collector plate 100. More specifically, the first current collector plate 100 can be welded to the first electrode tab 11 and terminal 30. Thus, terminal 30 can have the same polarity as the first electrode tab 11.

[0038] More specifically, the terminal 30 may include a terminal body 31, at least a portion of which is exposed to the outside of the battery can 20, and a connecting portion 32 which is coupled to the terminal body 31 and to which the first current collector plate 100 is connected.

[0039] The terminal body 31 and the connecting portion 32 can be provided as a single unit. However, the terminal body 31 and the connecting portion 32 may be provided as separate components and connected to each other.

[0040] The terminal body 31 can be substantially disc-shaped. The central part of the terminal body 31 can protrude upward and be exposed to the outside of the battery can 20. Preferably, the central part of the terminal body 31 can protrude upward from the battery can 20. Therefore, external terminals such as busbars can be electrically connected to the terminal body 31 from the outside of the battery cell 1. The edge portion of the terminal body 31 can be fixed and supported by the gasket 40.

[0041] The connecting portion 32 can be connected to the lower side of the terminal body 31. The first current collector plate 100, more specifically the lead portion 120 of the first current collector plate 100, can be connected to the connecting portion 32. The lead portion 120 can be welded to the connecting portion 32.

[0042] The battery cell 1 may include a gasket 40 to insulate the battery can 20 from the terminals 30. The gasket 40 can be substantially ring-shaped. The gasket 40 may be formed integrally as shown in Figure 1, or it may include multiple components that are separated from each other.

[0043] At least a portion of the gasket 40 can be fixed between the beading portion 21 and the crimping portion 22 of the battery can 20. Also, the edge of the terminal 30, more specifically the edge of the terminal body 31, can be fixed to the gasket 40. The gasket 40 ensures that the polarities of the battery can 20 and the terminals 30 are opposite to each other, thereby preventing a short circuit.

[0044] The battery cell 1 may include an insulator 50 that insulates the first current collector plate 100 from the battery can 20. The insulator 50 may be substantially disc-shaped. The edge of the insulator 50 may be positioned between the beading portion 21 of the battery can 20 and the first current collector plate 100. Thus, the insulator 50 can insulate the first current collector plate 100 from the beading portion 21 of the battery can 20.

[0045] The insulator 50 may be provided with a projection that extends from the edge of the insulator 50 in the axial direction of the electrode assembly 10. The projection can extend between the inner circumference of the battery can 20 and the edge of the first current collector plate 100. Therefore, the first current collector plate 100 and the inner circumference of the battery can 20 can be insulated.

[0046] An opening 51 can be formed in the insulator 50 through which the lead portion 120 of the first current collector plate 100 passes. The lead portion 120 can be connected to the terminal 30, or more specifically, to the connecting portion 32, via the opening 51.

[0047] On the other hand, the first current collector plate 100 (hereinafter referred to as "current collector plate") may include a main body 110 welded to the electrode assembly 10 and a lead portion 120 connected to the main body 110.

[0048] The main body 110 can be welded to the first electrode tab 11 (hereinafter referred to as "electrode tab"). The main body 110 can have a substantially disc shape. The lead portion 120 can extend outward from the main body 110 in a radially outward direction. The lead portion 120 has a certain width and can extend from the main body 110. The main body 110 and the lead portion 120 can be formed integrally.

[0049] The main body 110 can have a recessed portion 111 formed in a radially inward direction from the outer circumference. The lead portion 120 can protrude radially outward from the recessed portion 111. Therefore, the inner end of the lead portion 120 can be located inside the edge of the main body 110.

[0050] A predetermined gap g can be formed between the inner edges of the recessed portion 111 and the edges of the lead portion 120. Therefore, interference between the lead portion 120 and the main body 110 can be prevented during the folding process of the lead portion 120.

[0051] A center hole 112 can be formed in the main body 110, facing the hollow C of the electrode assembly 10. The diameter of the center hole 112 may be larger than the diameter of the hollow C. The center hole 112 and the hollow C can function as passages into which a welding rod (not shown) can be inserted for welding the second electrode plate 101 to the inner bottom surface of the battery can 20.

[0052] The main body 110 may have at least one through-hole 113 located outside the center hole 112. Preferably, multiple through-holes 113 can be arranged along the circumferential direction of the main body 110. The through-holes 113 can function as passages through which the electrolyte can pass. Therefore, the impregnation of the electrode assembly 10 with the electrolyte can be improved.

[0053] The main body 110 can be provided with a welded portion 114 that is welded to the electrode tab 11. More specifically, the main body 110 can be laser-welded to the electrode tab 11 while in close contact with the electrode tab 11, which has been bent by a mask jig 200 (see Figure 3), as described later, to form the welded portion 114.

[0054] Multiple welds 114 can be formed along the circumferential direction of the main body 110. Some of the multiple welds 114 can be located between some of the multiple through holes 113 with respect to the circumferential direction of the main body 110. Other parts of the multiple welds 114 can be located between some of the recessed parts 111 and some of the through holes 113 with respect to the circumferential direction of the main body 110.

[0055] This allows the main body 110 of the current collector plate 100 to be welded well to the electrode tab 11. It also prevents the main body 110 and the electrode tab 11 from separating during the bending process of the lead portion 120.

[0056] Figure 3 is a bottom view showing both a welding mask jig and a current collector plate according to one embodiment of the present invention, and Figure 4 is a cross-sectional view along line A-A' in Figure 3. A welding mask jig 200 (hereinafter referred to as "mask jig") according to one embodiment of the present invention may be a mask jig for laser welding a current collector plate 100 to an electrode assembly 10, and more specifically to an electrode tab 11 of the electrode assembly 10.

[0057] The mask jig 200 may include a main body 210, a receiving groove 220 recessed to a predetermined depth from one surface of the main body 210 (e.g., the bottom surface), and a through hole 230 formed from the other surface of the main body 210 (e.g., the top surface) through to the receiving groove 220.

[0058] The main body 210 may be a rigid body having a predetermined thickness. The thickness of the main body 210 may be much greater than the thickness of the current collector plate 100. The main body 210 may be substantially rectangular in shape, but is not limited thereto.

[0059] Fastening portions 240 for fastening to external devices can be provided on both sides of the main body 210. The fastening portions 240 can be formed integrally with the main body 210, but are not limited to this. Multiple fastening holes 241 can be provided in each fastening portion 240.

[0060] The housing groove 220 can be recessed to a predetermined depth from one surface of the main body 210. The depth of the housing groove 220 can be the same as or similar to the thickness of the current collector plate 100. However, it is not limited to this, and if the inner diameter of the housing groove 220 is larger than the outer diameter of the electrode assembly 10, the depth of the housing groove 220 may be greater than the thickness of the current collector plate 100. Alternatively, if the inner diameter of the housing groove 220 is smaller than the outer diameter of the electrode assembly 10 and larger than the outer diameter of the current collector plate 100, the depth of the housing groove 220 may be less than the thickness of the current collector plate 100. This allows the current collector plate 100 to be in close contact with the inside of the housing groove 220. The shape of the housing groove 220 can correspond to the shape of the current collector plate 100.

[0061] More specifically, the receiving groove 220 may include a first groove 221 communicating with the through hole 230 and a second groove 222 extending radially outward from the first groove 221.

[0062] The first groove 221 can be configured to accommodate the body 110 of the current collector plate 100. The first groove 221 can have a shape corresponding to the body 110 of the current collector plate 100. The second groove 222 can be configured to accommodate the lead portion 120 of the current collector plate 100. The second groove 222 can have a shape corresponding to the lead portion 120 of the current collector plate 100.

[0063] This prevents the lead portion 120 of the current collector plate 100 from interfering with the main body 210 of the mask jig 200 during the welding process using the mask jig 200. Furthermore, the mask jig 200 can ensure that the current collector plate 100 is precisely aligned and in close contact with the electrode assembly 10.

[0064] The inner end of the second groove 222 can be located inside the inner circumference of the first groove 221. This corresponds to the inner end of the lead portion 120 being located inside the edge of the main body 110 in the current collector plate 100. Therefore, the projection 250, described later, can pressurize the inner end of the lead portion 120.

[0065] The second groove 222, like the lead portion 120, can have a certain width W1. The width W1 of the second groove 222 can be the same as or similar to the width of the lead portion 120.

[0066] The outer end of the second groove 222 can be left open. This allows the lead portion 120 to protrude beyond the second groove 222, even if it is sufficiently long, so as not to interfere with the main body 210 of the mask jig 200.

[0067] The through-hole 230 can be formed through the other side of the main body 210 to the receiving groove 220, and more specifically to the first groove 221. A laser unit (not shown) can irradiate the main body 110 of the current collector plate 100 with a laser beam through the through-hole 230 to form a welded portion 114.

[0068] The diameter of the through-hole 230 may correspond to or be smaller than the diameter of the first groove 221. Preferably, a step can be formed between the inner circumference of the through-hole 230 and the inner circumference of the first groove 221. This step pressurizes the edge of the body 110 of the current collector plate 100, allowing it to adhere tightly to the electrode assembly 10.

[0069] On the other hand, as shown in Figure 1, the lead portion 120 of the current collector plate 100 can be bent relative to the main body 110 and connected to the terminal 30. However, conventionally, the location where bending occurred in the lead portion 120 was determined randomly, which resulted in a decrease in process efficiency.

[0070] To solve these problems, a projection 250 can be formed in the second groove 222, configured to press against the lead portion 120 of the current collector plate 100. More specifically, the projection 250 can be formed at the inner end of the second groove 222.

[0071] When the mask jig 200 brings the current collector plate 100 into close contact with the electrode assembly 10, the projection 250 can pressurize the lead portion 120, and more specifically, the inner end of the lead portion 120.

[0072] The projection 250 can be formed parallel to the width of the second groove 222. That is, a bending line parallel to the width of the lead portion 120 can be formed on the lead portion 120 that is pressurized by the projection 250. Therefore, the point on the lead portion 120 that is pressurized by the projection 250 can be easily bent.

[0073] The length of the projection 250 may be more than half the width of the second groove 222. Therefore, the bending line formed on the lead portion 120 can be made sufficiently long, and the bending of the lead portion 120 can be performed reliably.

[0074] The end of the projection 250 can be located on the same plane as the inner surface of the first groove 221, or it can protrude beyond the inner surface of the first groove 221. This allows the projection 250 to reliably pressurize the lead portion 120 of the current collector plate 100.

[0075] In the receiving groove 220, the second groove 222 can be formed deeper than the first groove 221. Therefore, the portion of the lead portion 220 located outside the projection 250 can be slightly raised within the second groove 222. In other words, a more reliable fold line can be formed in the portion pressurized by the projection 250.

[0076] This allows the lead portion 120 to be bent at a precise position, thereby improving process efficiency. Furthermore, it has the advantage of forming a bend in the lead portion 120 during the welding process using the mask jig 200, without requiring a separate process to form the bend in the lead portion 120.

[0077] Figures 5 and 6 are cross-sectional views showing a welding mask jig and a current collector plate together according to another embodiment of the present invention. The following explanation will omit any content that overlaps with what was mentioned above and will focus on the differences.

[0078] Referring to Figure 5, the second groove 222 of the mask jig 200' according to another embodiment of the present invention may include a section in which the depth increases as it moves away from the inner end 222a of the second groove 222. That is, the inner end 222a of the second groove 222 may be the most protruding part.

[0079] In this case, even if no other projection 250 (see Figure 4) is formed in the second groove 222, the inner end 222a of the second groove 222 can pressurize the lead portion 220. The inner end 222a of the second groove 222 can perform the role of the aforementioned projection 250.

[0080] When the mask jig 200' brings the current collector plate 100 into close contact with the electrode assembly 10, the inner end 222a of the second groove 222 can pressurize the lead portion 120, or more specifically, the inner end of the lead portion 120.

[0081] The inner end 222a of the second groove 222 can be located on the same plane as the inner surface of the first groove 221, or it can protrude beyond the inner surface of the first groove 221. This allows the inner end 222a of the second groove 222 to reliably pressurize the lead portion 120 of the current collector plate 100.

[0082] Since the second groove 222 includes a section that becomes deeper as it moves away from the inner end 222a, the portion of the lead portion 220 located outside the inner end 222a of the second groove 222 can be slightly lifted within the second groove 222. In other words, a more reliable fold line can be formed in the portion pressurized by the inner end 222a of the second groove 222.

[0083] Furthermore, as shown in the modified example in Figure 6, the second groove 222 includes a section in which the depth increases as it moves away from the inner end 222a of the second groove 222, and it is also possible to have a configuration in which a projection 250 is added to the inner end 222a of the second groove 222.

[0084] Figure 7 is a cross-sectional view showing a welding mask jig and a current collector plate together according to another embodiment of the present invention. Referring to Figure 7, the mask jig 200'' according to another embodiment of the present invention does not necessarily have to include a configuration for pressurizing the lead portion 120 of the current collector plate 100 (for example, the projection 250 described above).

[0085] In this case, although it is not possible to precisely determine the location where bending occurs in the lead portion 120, the structure of the mask jig 200'' is simplified, which has the advantage of being easier to manufacture. In addition, the advantage that the lead portion 120 does not interfere with the main body 210 of the mask jig 200'' can be maintained.

[0086] The above description is merely illustrative of the technical concept of the present invention, and any person with ordinary skill in the art to which the present invention belongs can make various modifications and alterations without departing from the essential characteristics of the present invention.

[0087] Therefore, the embodiments disclosed in this invention are for illustrative purposes only and not to limit the technical concept of the invention, and the scope of the technical concept of the invention is not limited by such embodiments.

[0088] The scope of protection of this invention must be interpreted in accordance with the claims described below, and all technical concepts within an equivalent scope should be interpreted as being included within the scope of rights of this invention. [Explanation of Symbols]

[0089] 100: Current collector plate 110: Main body (of the current collector plate) 111: Sinkhole 112: Center Hall 113: Through hole 114: Welded section 120: Lead section 200: Welding mask jig 210: Main unit 220: Storage groove 221: 1st groove 222:Second groove 222a: Inner end (of the second groove) 230: Through hole 240: Fastening part 250: Protrusion

Claims

1. The main unit and A recessed groove extending to a predetermined depth from one side of the main body, configured to accommodate a current collector plate, A through hole is formed from the other side of the main body to the housing groove, and is configured to allow a laser beam to be incident on the current collector plate located within the housing groove, Includes, The aforementioned consultation groove is A first groove communicating with the aforementioned through hole, A second groove extending radially outward from the first groove, A welding mask jig, including a welding mask fixture.

2. The welding mask jig according to claim 1, wherein a projection configured to press against the lead portion of the current collector plate is formed at the inner end of the second groove.

3. The welding mask jig according to claim 2, wherein the projection is formed parallel to the width of the second groove.

4. The welding mask jig according to claim 3, wherein the length of the projection is more than half the width of the second groove.

5. The welding mask jig according to claim 2, wherein the end of the projection is located on the same plane as the inner surface of the first groove, or protrudes beyond the inner surface of the first groove.

6. The welding mask jig according to claim 1, wherein the inner end of the second groove is located inward from the inner circumference of the first groove.

7. The first groove is configured to accommodate the main body that will be welded to the electrode assembly in the current collector plate, The welding mask jig according to claim 1, wherein the second groove is configured to accommodate a lead portion that protrudes radially outward from the main body of the current collector plate.

8. The welding mask jig according to claim 1, wherein the second groove is formed deeper than the first groove.

9. The welding mask jig according to claim 1, wherein the second groove includes a section in which the depth increases as it moves away from the inner end of the second groove.

10. The welding mask jig according to claim 9, wherein the inner end of the second groove is located on the same plane as the inner surface of the first groove, or protrudes beyond the inner surface of the first groove.

11. The welding mask jig according to any one of claims 1 to 10, wherein the outer end of the second groove is open.

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