Electrode lead-welding jig device

Abstract

Provided is an electrode lead-welding jig device configured to prevent deformation of a jig caused by thermal energy generated during welding of an electrode lead. The electrode lead-welding jig device is configured to weld a battery cell stack in which a plurality of battery cells are stacked, the battery cells each including a battery case and an electrode lead protruding from the battery case to the outside. The device comprises: a jig including a jig body that is disposed between the electrode lead and the battery case to prevent thermal energy for welding adjacent electrode leads of the plurality of battery cells from travelling toward the battery case and being transferred to the plurality of battery cells; and a pallet connected to the lower part of the jig to fix the jig, wherein the jig includes a pallet connection part extending from the jig body to be connected to the pallet, and a groove part provided in the jig body to prevent deformation of the jig caused by thermal energy for welding the electrode leads.

Description

Electrode lead welding jig device

[0001] The present invention relates to an electrode lead welding jig device, and in particular, to an electrode lead welding jig device configured to prevent deformation of the jig caused by thermal energy generated during electrode lead welding.

[0002] The demand for secondary batteries is increasing as an energy source for electronic devices such as mobile phones, laptop computers, and wearable devices, or for electric vehicles. In particular, electric vehicles may be equipped with battery packs to supply power to the drive motor.

[0003] A battery pack may consist of a pack case in which multiple battery cells or multiple battery modules composed of multiple battery cells are enclosed.

[0004] Secondary batteries can be classified into nickel-cadmium, nickel-hydrogen, and lithium secondary batteries depending on the type of electrode; among these, research and development is actively underway for lithium secondary batteries, which possess the advantages of high operating voltage and high energy density per unit weight.

[0005] Lithium secondary batteries primarily use lithium-based oxides and carbon materials as positive and negative active materials, respectively. A lithium secondary battery may comprise an electrode assembly in which a positive electrode and a negative electrode, each coated with a positive active material and a negative active material, are arranged with a separator in between, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0006] Lithium secondary batteries can be classified according to the shape of the battery case into prismatic and cylindrical secondary batteries in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries in which the electrode assembly is embedded in a pouch case made of an aluminum laminate sheet.

[0007] Pouch-type secondary batteries can have their capacity and output improved by connecting multiple battery cells in series or parallel to form a battery cell stack, and can be mounted together with various control and protection systems, such as a Battery Management System (BMS) and a cooling system, to form a battery pack.

[0008] To connect multiple battery cells in series or parallel, the electrode leads of the battery cells can be connected to a separate busbar, or the electrode leads of the battery cells can be directly connected to each other without a separate busbar.

[0009] Busbar-free welding, a welding method for directly connecting the electrode leads of battery cells without a busbar, simplifies the structure and reduces costs by directly welding the electrode leads. However, the battery cells may be damaged due to the transfer of thermal energy generated during electrode lead welding.

[0010] Although welding jigs are used to prevent this, thermal deformation may occur in the jig due to repetitive and continuous welding, and the problem of overall welding defects may occur as the thermally deformed jig fuses with the electrode lead.

[0011] The present invention aims to provide an electrode lead welding jig device configured to prevent damage to a battery cell caused by thermal energy generated during direct welding between electrode leads.

[0012] The present invention aims to provide an electrode lead welding jig device configured to prevent thermal deformation of the jig caused by thermal energy generated during direct welding between electrode leads.

[0013] An electrode lead welding jig device configured to weld a plurality of battery cells, each including a battery case and an electrode lead protruding outward from the battery case according to one aspect of the present invention, may further include a jig body disposed between the electrode lead and the battery case to prevent thermal energy for welding the electrode leads of adjacent battery cells to each other from being transferred to the plurality of battery cells toward the battery case, and a pallet connected to the lower part of the jig to fix the jig, wherein the jig may further include a pallet connecting part extending from the jig body to be connected to the pallet, and a groove provided in the jig body to prevent the jig from being deformed by the thermal energy for welding the electrode leads.

[0014] Additionally, the electrode leads of each of the adjacent plurality of battery cells may be configured to be bent toward each other and overlapped to be welded by passing through a slit provided in a lead frame configured to support the electrode leads, and may form a receiving portion provided between the lead frame and the welding portion, and the jig may be inserted into the receiving portion such that the groove portion faces the welding portion.

[0015] In addition, the above-mentioned groove may be configured to be recessed so as to be stepped with respect to one side of the jig body facing the above-mentioned weld.

[0016] In addition, the length of the groove along the direction in which the groove is inserted into the receiving portion may be longer than the length of the weld portion.

[0017] In addition, the thickness of the groove along the direction in which the groove faces the weld may be 2 / 3 or less of the thickness of the jig body.

[0018] In addition, the thickness of the jig body along the direction in which the groove portion faces the weld portion may be 3mm to 5mm, and the thickness of the groove portion may be 1.5mm to 2.5mm.

[0019] In addition, the above jig may include a SiC material containing silicon carbide or an S45C material containing carbon steel.

[0020] In addition, the above-mentioned groove may include a plurality of grooves spaced apart from each other along the direction in which the jig is inserted into the receiving portion.

[0021] In addition, the jig may further include a reinforcing member inserted into the groove to reduce the thermal deformation rate of the jig caused by the thermal energy of welding the electrode lead.

[0022] In addition, the material of the reinforcing member may be different from the material of the jig body.

[0023] In addition, the material of the jig body may include SIC material containing silicon carbide or S45C material containing carbon steel, and the material of the reinforcing member may include SUS304 material containing stainless steel or SUS316 material.

[0024] In addition, the above battery cell stack may include a pouch-type battery cell stack that is directly accommodated in a pack case to form a battery pack.

[0025] An electrode lead welding jig device configured to weld a battery cell stack having a plurality of battery cells including electrode leads according to another aspect of the present invention comprises a jig provided to prevent thermal energy for welding the electrode leads of adjacent battery cells to each other from being transferred to a lead frame configured to support the electrode leads by being disposed on one side of the electrode leads, and a pallet connected to the jig to move the jig vertically, wherein the jig may include a jig body movably inserted between the electrode leads and the lead frame, a pallet connecting part extending from the jig body to be connected to the pallet, and a groove part formed by being recessed from the jig body to reduce the thermal deformation rate of the jig caused by the thermal energy for welding the electrode leads.

[0026] In addition, the groove portion may be positioned adjacent to the other end of the jig body that is opposite to the pallet connecting portion extending from one end of the jig body.

[0027] In addition, the above-mentioned groove may include a trapezoidal cross-section.

[0028] The electrode lead welding jig device according to the present invention can prevent the battery cell from being damaged or the jig from being thermally deformed by the thermal energy generated during direct welding between electrode leads.

[0029] The electrode lead welding jig device according to the present invention can extend the usable period of the jig and prevent fusion with the electrode lead due to thermal deformation of the jig or welding defects caused by this.

[0030] FIG. 1 is a drawing illustrating a battery pack using an electrode lead welding jig device according to a first embodiment of the present invention.

[0031] FIG. 2 is a drawing illustrating a vehicle equipped with a battery pack using an electrode lead welding jig device according to the first embodiment of the present invention.

[0032] FIG. 3 is a drawing illustrating a battery cell stack in a battery pack using an electrode lead welding jig device according to the first embodiment of the present invention.

[0033] FIG. 4 is a drawing illustrating the appearance of a jig inserted into a receiving portion before the electrode lead is bent in an electrode lead welding jig device according to the first embodiment of the present invention.

[0034] FIG. 5 is a drawing illustrating an electrode lead welding jig device according to the first embodiment of the present invention, in which an electrode lead is bent and a jig is inserted into a receiving portion.

[0035] FIG. 6 is a drawing illustrating a battery pack using an electrode lead welding jig device according to the first embodiment of the present invention, in which a jig is positioned between electrode leads and a lead frame that are joined together.

[0036] FIG. 7 is a drawing illustrating a vertically moved jig so that it is inserted into or separated from a receiving portion in an electrode lead welding jig device according to a first embodiment of the present invention.

[0037] FIG. 8 is a drawing illustrating a jig including a groove portion in an electrode lead welding jig device according to a first embodiment of the present invention.

[0038] FIG. 9 is a drawing illustrating a jig including a plurality of grooves in an electrode lead welding jig device according to a second embodiment of the present invention.

[0039] FIG. 10 is a drawing illustrating a jig including a groove and a reinforcing member in an electrode lead welding jig device according to a third embodiment of the present invention.

[0040] FIG. 11 is a drawing illustrating a jig including a groove portion in an electrode lead welding jig device according to the fourth embodiment of the present invention.

[0041] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and various modifications that may replace the embodiments and drawings of this specification may exist at the time of filing this application.

[0042] Additionally, the same reference numbers or symbols presented in each figure of this specification represent parts or components that perform substantially the same function. Furthermore, the terms used in this specification are for describing embodiments and are not intended to limit or / or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0043] In this specification, terms such as “comprising” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0044] Additionally, terms including ordinal numbers, such as "first," "second," etc., used in this specification may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another.

[0045] Meanwhile, terms such as “front,” “rear,” “upper,” and “lower” used in the following description are defined based on the drawings, and the shape and location of each component are not limited by these terms.

[0046] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0047] FIG. 1 is a drawing illustrating a battery pack using an electrode lead welding jig device according to a first embodiment of the present invention. FIG. 2 is a drawing illustrating a vehicle equipped with a battery pack using an electrode lead welding jig device according to a first embodiment of the present invention.

[0048] Referring to FIGS. 1 and 2, a battery pack (2000) manufactured according to the first embodiment of the present invention may be formed by housing a battery cell stack (1), in which a plurality of battery cells (10) are stacked, in a pack case (2100). The battery pack (2000) may additionally include various control and protection systems, such as a Battery Management System (BMS).

[0049] The battery pack (2000) can be applied to various devices. Specifically, it can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, or to an Energy Storage System (ESS), but is not limited to these and can be applied to various devices that can use secondary batteries.

[0050] In an electric vehicle (V), the wheel is driven by a motor that receives power from a battery pack (2000), so that the electric vehicle can be operated.

[0051] FIG. 3 is a drawing illustrating a battery cell stack in a battery pack using an electrode lead welding jig device according to a first embodiment of the present invention. Referring to FIGS. 1 to 3, a battery pack (2000) manufactured according to a first embodiment of the present invention may include a battery cell stack (1) composed of a plurality of battery cells (10) stacked together. Each of the plurality of battery cells (10) constituting the battery cell stack (1) may include an electrode assembly (not shown) and a battery case (12) for accommodating the electrode assembly (not shown).

[0052] The electrode assembly (not shown) may be configured to include a separator (not shown) disposed between a positive electrode (not shown) and a negative electrode (not shown). Each of the plurality of battery cells (10) may be formed by housing the electrode assembly (not shown) in a battery case (12) and injecting an electrolyte into the battery case (12).

[0053] The electrolyte injected into the battery case (12) may be a lithium salt-containing non-aqueous electrolyte, and the lithium salt-containing non-aqueous electrolyte may include a non-aqueous electrolyte and a lithium salt. As the non-aqueous electrolyte, a non-aqueous organic solvent, an organic solid electrolyte, an inorganic solid electrolyte, etc. may be used. However, it is not limited thereto.

[0054] The separator (not shown) can physically separate the positive electrode (not shown) and the negative electrode (not shown) to prevent an electrical short circuit between them. The separator (not shown) separates the negative electrode (not shown) and the positive electrode (not shown) and provides a pathway for lithium ions to move; it can be used without any special restrictions as long as it is typically used as a separator in a lithium secondary battery.

[0055] The positive electrode (not shown) may include a positive current collector (not shown) and a positive active material layer (not shown) formed on one or both sides of the positive current collector (not shown). The negative electrode (not shown) may include a negative current collector (not shown) and a negative active material layer (not shown) formed on one or both sides of the negative current collector (not shown).

[0056] The positive current collector (not shown) may include aluminum (Al), and the negative current collector (not shown) may include copper (Cu). However, it is not limited thereto.

[0057] The positive electrode active material layer (not shown) may have a nanostructure, which can improve electrical conductivity and increase the surface area of ​​the positive electrode (not shown), thereby enhancing the electrochemical reaction rate. The negative electrode active material layer (not shown) may contain graphite and may undergo surface modification treatment to maximize reactivity with lithium ions.

[0058] The positive active material layer (not shown) may include a positive active material, a conductive material, and a binder. Specifically, the positive (not shown) may be manufactured by applying a positive slurry prepared by dispersing the positive active material, the conductive material, and / or the binder in a solvent such as dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, etc., onto one or both sides of a positive current collector (not shown), removing the solvent from the positive slurry through a drying process, and then rolling.

[0059] A conductive material is used to impart conductivity to an electrode, and in the battery being constructed, any material that possesses electronic conductivity without causing chemical changes can be used without any special restrictions.

[0060] The binder can play a role in improving the adhesion between positive active material particles and the adhesion between the positive active material and the positive current collector (not shown).

[0061] The negative electrode active material layer (not shown) may include a negative electrode active material, a conductive material, and a binder. Specifically, the negative electrode (not shown) may be manufactured by applying a negative electrode slurry prepared by dispersing the negative electrode active material, the conductive material, and the binder in a solvent such as dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, or water on one or both sides of a negative electrode current collector (not shown), removing the solvent from the negative electrode slurry through a drying process, and then rolling.

[0062] The cathode active material may be any of the various cathode active materials used in the industry, such as carbon-based cathode active materials, silicon-based cathode active materials, or mixtures thereof.

[0063] FIG. 4 is a drawing illustrating the appearance of a jig inserted into a receiving portion before the electrode lead is bent in an electrode lead welding jig device according to the first embodiment of the present invention. FIG. 5 is a drawing illustrating the appearance of a jig inserted into a receiving portion after the electrode lead has been bent in an electrode lead welding jig device according to the first embodiment of the present invention. FIG. 6 is a drawing illustrating the appearance of a jig positioned between electrode leads and a lead frame that are joined together in a battery pack using an electrode lead welding jig device according to the first embodiment of the present invention. FIG. 7 is a drawing illustrating the appearance of a jig vertically moved so that it is inserted into a receiving portion or separated from a receiving portion in an electrode lead welding jig device according to the first embodiment of the present invention.

[0064] Referring to FIGS. 1 to 7, each of the plurality of battery cells (10) forming a battery pack (2000) manufactured according to the first embodiment of the present invention may include an electrode lead (13) protruding outward from a battery case (12). The battery pack (2000) may include a battery cell stack (1) in which a plurality of battery cells (10) including the electrode lead (13) are stacked, and a lead frame (20) located on one side of the battery cell stack (1).

[0065] Although not illustrated, a lead frame (20) may be additionally located on the other side of the battery cell stack (1). However, to avoid repetition of the explanation, the following description will be based on a single lead frame (20) provided on one side of the battery cell stack (1).

[0066] The lead frame (20) may include an electrically insulating material. The lead frame (20) may include a plastic material. However, it is not limited thereto.

[0067] Each of the plurality of battery cells (10) of the battery pack (2000) manufactured according to the first embodiment of the present invention may include a pouch-type battery cell (10) and may be formed into a rectangular sheet-type structure. The battery cells (10) may be composed of a plurality of units, and the plurality of battery cells (10) may be stacked so as to be electrically connected to each other to form a battery cell stack (1).

[0068] The battery cell stack (1) may have a plurality of battery cells (10) constituting the battery cell stack (1) connected in a zigzag pattern in series. However, it is not limited thereto.

[0069] Each electrode lead (13) of a plurality of battery cells (10) may include two electrode leads (13) protruding from both sides of the battery case (12).

[0070] A battery cell stack (1) may have a plurality of battery cells (10) stacked along a direction parallel to the y-axis. Two electrode leads (13) provided in one of the battery cells (10) may each protrude from the battery case (12) in the x-axis direction and the -x-axis direction.

[0071] The battery cell (10) may have a structure in which two electrode leads (13) protrude facing each other. One side of each of the two electrode leads (13) may be connected to an electrode assembly (not shown) that is accommodated inside the battery case (12), and the other side of the electrode lead (13) may protrude from the electrode assembly (not shown) to the outside of the battery case (12).

[0072] The two electrode leads (13) may have different polarities. One of the two electrode leads (13) may be a positive lead and the other may be a negative lead. With respect to one battery cell (10), the electrode leads (13) may protrude to both sides of the battery case (12) in a direction in which the positive lead and the negative lead face each other.

[0073] The battery cell (10) can be manufactured by sealing the outer periphery of the battery case (12) while housing an electrode assembly (not shown) in the battery case (12). The battery case (12) may be made of a laminate sheet including a resin layer and a metal layer. However, it is not limited thereto.

[0074] In FIG. 3, a plurality of battery cells (10) forming a battery cell stack (1) are shown as comprising four battery cells (10), but are not limited thereto.

[0075] The lead frame (20) may be located on one side of the battery cell stack (1). The lead frame (20) may be located on one side of the battery cell stack (1) in the direction in which at least one of the two electrode leads (13) protrudes.

[0076] A plurality of battery cells (10) may include a first battery cell (10a) and a second battery cell (10b) arranged adjacent to each other. In the following description, the plurality of battery cells (10) are described based on the first battery cell (10a) and the second battery cell (10b), but it is obvious that a mutually identical or similar structure may be applied to other battery cells (10) constituting the plurality of battery cells (10) excluding the first battery cell (10a) and the second battery cell (10b).

[0077] The first battery cell (10a) may include a first electrode lead (13a) protruding outward from the battery case (12), and the second battery cell (10b) may include a second electrode lead (13b) protruding outward from the battery case (12).

[0078] The lead frame (20) may include a plurality of slits (21) configured to allow a plurality of electrode leads (13) to pass through. The slits (21) may include a first slit (21a) configured to allow a first electrode lead (13a) to pass through and a second slit (21b) configured to allow a second electrode lead (13b) to pass through.

[0079] The first electrode lead (13a) and the second electrode lead (13b) are described as each being composed of a single unit, but are not limited thereto. That is, the first electrode lead (13a) may include a plurality of first electrode leads (13a), and the second electrode lead (13b) may include a plurality of second electrode leads (13b).

[0080] A plurality of first electrode leads (13a) can penetrate a single first slit (21a) together, and a plurality of second electrode leads (13b) can penetrate a single second slit (21b) together. Through this, the integration density of the battery pack (2000) can be improved, and power efficiency can be achieved.

[0081] The first electrode lead (13a) protruding from the battery case (12) of the first battery cell (10a) and the second electrode lead (13b) protruding from the battery case (12) of the second battery cell (10b) can each pass through the first slit (21a) and the second slit (21b) formed in the lead frame (20), and then be bent and overlapped to form an overlap portion (14).

[0082] The overlapping portion (14) may include an area where the first electrode lead (13a) and the second electrode lead (13b) overlap. In the overlapping portion (14), at least a portion of the first electrode lead (13a) and at least a portion of the second electrode lead (13b) may be joined to each other.

[0083] The overlapping portion (14) can be positioned adjacent to the opposite side of the side of the lead frame (20) facing the battery cell stack (1).

[0084] The first electrode lead (13a) and the second electrode lead (13b) can be welded together at the overlapping portion (14). The first electrode lead (13a) and the second electrode lead (13b) can form a welded portion (15) configured to be welded together at the overlapping portion (14).

[0085] That is, the overlapping portion (14) can be formed by the first electrode lead (13a) and the second electrode lead (13b), which protrude in the same direction relative to the adjacent first battery cell (10a) and second battery cell (10b), passing through the first slit (21a) and the second slit (21b), respectively, and being bent in a direction perpendicular to the direction of protrusion and overlapping each other.

[0086] At least a portion of the first electrode lead (13a) and at least a portion of the second electrode lead (13b) may be joined together in the overlapping portion (14). Only a portion of the overlapping portion of the first electrode lead (13a) and the second electrode lead (13b) may be joined to form a weld (15), or the entire overlapping portion of the first electrode lead (13a) and the second electrode lead (13b) may be joined to form a weld (15).

[0087] Although the weld (15) is shown as being formed in a part of the overlapping part (14) with shading, the shading is intended to distinguish the weld (15) and the overlapping part (14) for convenience of explanation in the drawing, and the relationship between the overlapping part (14) and the weld (15) is not limited thereto. That is, the weld (15) may be formed in a part of the overlapping part (14), or the weld (15) may be formed over the entire overlapping part (14).

[0088] There are no special restrictions on the joining method of the first electrode lead (13a) and the second electrode lead (13b), but it may be preferable to perform a welded joining.

[0089] The first electrode lead (13a) and the second electrode lead (13b) of the battery pack (2000) manufactured according to the first embodiment of the present invention can form a High Voltage (HV) connection by directly welding them together. The HV connection is a connection configured to serve as a power source for supplying power and may include a connection between a plurality of battery cells (10).

[0090] The lead frame (20) may include a support portion (22) configured to support a first electrode lead (13a) and a second electrode lead (13b) that are welded together, and an opening portion (23) provided in the support portion (22). That is, the opening portion (23) may be formed by drilling through the center of the support portion (22).

[0091] The opening (23) of the battery pack (2000) manufactured according to the first embodiment of the present invention may include a shape in which the side where the overlapping part (14) is located is open and the side where the plurality of battery cells (10) are located is closed, as shown in FIG. 6. However, it is not limited thereto, and the opening (23) may include a shape in which both the side where the overlapping part (14) is located and the side where the plurality of battery cells (10) are located are open.

[0092] Considering the material of the lead frame (20), damage to the lead frame (20) itself may occur due to the thermal energy generated by the welding joint between the first electrode lead (13a) and the second electrode lead (13b).

[0093] An opening (23) can be provided in the center of the support portion (22) of the lead frame (20) so as to prevent damage caused by thermal energy generated by the welding joint between the first electrode lead (13a) and the second electrode lead (13b).

[0094] The support portion (22) may not come into direct contact with the weld portion (15) where the first electrode lead (13a) and the second electrode lead (13b) are welded by the opening portion (23). There is no particular limitation on the area of ​​the opening portion (23), but it may be preferable to form an area that can encompass the entire area of ​​the weld portion (15) where the first electrode lead (13a) and the second electrode lead (13b) are welded together.

[0095] A battery pack (2000) manufactured according to a first embodiment of the present invention may include a sensing assembly (30) mounted on a lead frame (20). The sensing assembly (30) may include a module connector (31), a bonding plate (32), and a connecting member (33).

[0096] The sensing assembly (30) may be located on the opposite side of the side of the lead frame (20) facing the battery cell stack (1). The sensing assembly (30) is for LV (Low Voltage) connection, and the LV connection may include a sensing connection for detecting and controlling the voltage of a plurality of battery cells (10). Through the sensing assembly (30), voltage information and temperature information of each of the plurality of battery cells (10) can be measured and transmitted to an external BMS (Battery Management System).

[0097] The sensing assembly (30) can be connected to the electrode lead (13). The module connector (31) can be mounted on the lead frame (20) and configured to transmit and receive signals to and from an external control device to control a plurality of battery cells (10).

[0098] The bonding plate (32) may include a metal material having electrical conductivity and may be bonded to the electrode lead (13).

[0099] The connecting member (33) is a member that connects the module connector (31) and the bonding plate (32) and may include a flexible printed circuit board (FPCB) or a flexible flat cable (FFC). However, it is not limited thereto.

[0100] Voltage and temperature information measured from multiple battery cells (10) can be transmitted to an external BMS (Battery Maintenance System) in sequence through a bonding plate (32), a connecting member (33), and a module connector (31). That is, the sensing assembly (30) can detect and control phenomena such as overvoltage, overcurrent, and overheating of each of the multiple battery cells (10).

[0101] A battery pack (2000) manufactured according to the first embodiment of the present invention may include a receiving portion (16), which is a free space provided between an overlapping portion (14) including a welded portion (15) and a lead frame (20) including an opening portion (23).

[0102] A receiving portion (16) may be provided between an electrode lead (13) and a battery cell (10), the electrode lead (13) comprising a first electrode lead (13a) and a second electrode lead (13b) that overlap each other. The receiving portion (16) may be connected to an opening portion (23). The receiving portion (16) may include an opening portion (23). At least a portion of the receiving portion (16) may form the opening portion (23). However, it is not limited thereto, and the receiving portion (16) may be entirely aligned with the opening portion (23).

[0103] An electrode lead welding jig device (100) according to the first embodiment of the present invention may be configured to weld a battery cell stack (1) in which a plurality of battery cells (10) are stacked, each cell having an electrode lead (13) protruding outward from a battery case (12).

[0104] The electrode lead welding jig device (100) may include a jig (110) movably positioned between the electrode leads (13) and the battery case (12) to prevent thermal energy for welding the electrode leads (13) of adjacent battery cells (10) to each other from being transferred to the battery case (12) and the battery cells (10).

[0105] The electrode lead welding jig device (100) may include a pallet (120) connected to the lower part of the jig (110) to move the jig (110) vertically, and a base (130) connected to the pallet (120) to support the jig (110) and the pallet (120).

[0106] A battery pack (2000) manufactured according to the first embodiment of the present invention may include electrode leads (13) provided on a plurality of adjacent battery cells (10) that are each bent toward one another and overlapped to form a welded portion (15) at the front of a battery case (12), and a receiving portion (16) provided between the battery case (12) and the welded portion (15), and a jig (110) may be configured to be inserted into the receiving portion (16).

[0107] The jig (110) can be vertically moved toward the electrode lead (13) provided on the upper part of the jig (110) together with the pallet (120) connected to the lower part of the jig (110) and inserted into the receiving part (16), or pulled out from the receiving part (16) downward and separated.

[0108] The electrode lead welding jig device (100) according to the first embodiment of the present invention can perform welding by inserting a jig (110) into a receiving portion (16) to prevent heat energy from being transferred to a lead frame (20) or a battery cell (10) when welding a weld portion (15) included in an overlapping portion (14) where adjacent first electrode leads (13a) and second electrode leads (13b) overlap.

[0109] The jig (110) can absorb thermal energy for welding the electrode leads (13) together. The jig (110) may be made of a material with a higher melting point than aluminum, which constitutes the positive current collector (not shown), or copper, which constitutes the negative current collector (not shown). However, it is not limited thereto.

[0110] The jig (110) and pallet (120) may be provided in multiple quantities. The jig (110) and pallet (120) may be provided in multiple quantities to correspond to the multiple openings (23) provided in the lead frame (20) or the multiple receiving portions (16) provided between the multiple welds (15) and the lead frame (20).

[0111] Multiple jigs (110) and pallets (120) can move vertically up and down together as a whole, and each can move vertically up and down separately.

[0112] FIG. 8 is a drawing illustrating a jig including a groove portion in an electrode lead welding jig device according to a first embodiment of the present invention. Referring to FIGS. 1 to 8, the electrode lead welding jig device (100) according to a first embodiment of the present invention may include a jig (110) disposed between the electrode leads (13) and the battery case (12) to prevent thermal energy for welding the electrode leads (13) of adjacent battery cells (10) to each other from being transferred to the battery case (12) and the battery cells (10).

[0113] The jig (110) may include a jig body (111), a pallet connecting portion (112) extending from the jig body (111) to be connected to a pallet (120), and a groove portion (113) provided in the jig body (111) to prevent the jig (110) from being deformed by the thermal energy of welding the electrode lead (13).

[0114] The jig (110) can be inserted into the receiving portion (16) such that the groove portion (113) provided in the jig faces the weld portion (15). In the jig (110) inserted into the receiving portion (16), one side of the jig body (111) where the groove portion (113) is provided faces the weld portion (15), and the other side of the jig body (111) faces the lead frame (20).

[0115] The jig body (111) may include a roughly rectangular shape, and the pallet connecting part (112) may include a roughly rectangular shape formed by extending from the end of the jig body (111). The pallet connecting part (112) may extend to both sides from one end of the jig body (111) according to the direction in which the jig (110) is inserted into the receiving part (16).

[0116] The length of the jig body (111) may be longer than the length of the weld section (15) depending on the direction in which the jig (110) is inserted into the receiving section (16). The width of the jig body (111) may be greater than the width of the weld section (15) depending on the direction in which the pallet connecting section (112) extends from both sides of the jig body (111). Therefore, the heat energy used to weld the weld section (15) can be entirely blocked by the jig (110) and prevented from being transferred to the lead frame (20) or battery cell (10).

[0117] The pallet connecting portion (112) may include a connecting hole (112a) configured to allow the jig (110) to be detachably connected to the pallet (120). The connecting hole (112a) may be provided in multiple numbers. The connecting hole (112a) according to the first embodiment of the present invention may include two connecting holes (112a) symmetrically arranged in the pallet connecting portion (112) with respect to the jig body (111). However, it is not limited thereto.

[0118] The jig (110) may be joined to the pallet (120) by a separate joining member (not shown) that joins the connecting hole (112a) of the pallet connecting part (112) and the pallet (120). The jig (110) may be bolted to the pallet (120) by the joining member (not shown). However, it is not limited thereto.

[0119] The jig (110) according to the first embodiment of the present invention may be configured to be replaceable from the pallet (120) so as to further extend the usable period. The jig (110) may be coupled to the pallet (120) so as to be detachably attached to the pallet (120) in a replaceable manner.

[0120] The pallet (120) may include a pallet body (121) configured to be connected to and support the jig (110), and a base connecting part (122) provided on the pallet body (121) and configured to be detachably connected to a base (130). The base (130) may be configured to be coupled to the base connecting part (122) of the pallet (120) provided on the upper side of the base (130).

[0121] The base connecting part (122) may include a protruding shape that protrudes downward from the pallet body (121). The base (130) may include a groove (not shown) provided to accommodate the protruding base connecting part (122). The groove (not shown) provided in the base connecting part (122) and the base (130) may be fitted together. However, this is not limited thereto, and the base connecting part (122) and the base (130) may include various coupling structures as long as they are coupling structures that can be fixed to each other in a separable manner.

[0122] For example, a protrusion shape that protrudes toward the upper pallet (120) rather than a groove shape may be provided on the base (130), and the base connecting part (122) may include a groove shape provided on the lower part of the pallet body (121) so as to accommodate the protrusion provided on the base (130).

[0123] The jig (110) inserted into the receiving portion (16) according to the first embodiment of the present invention may undergo thermal deformation due to continuous thermal energy welding the weld portion (15) of the electrode lead (13).

[0124] Generally, to improve the welding strength between electrode leads (13) each comprising Al material and Cu material, a through-welding method may be used for welding the electrode leads (13). Approximately 25 to 30% of the thermal energy used to through-weld the electrode leads (13) may pass through the weld (15) and be transferred to a jig (110) positioned behind the weld (15).

[0125] As a result, the jig (110) that has undergone thermal deformation may gradually tilt toward the weld (15) and bend as shrinkage stress occurs while it cools down.

[0126] A jig (110) that has undergone continuous bending due to repeated welding of the weld portion (15) can be heat-fused with an electrode lead (13) on which the weld portion (15) is provided, which causes a welding defect in the electrode lead (13), which can lead to a manufacturing defect in the battery pack (2000).

[0127] A jig (110) according to the first embodiment of the present invention may include a groove (113) provided in a jig body (111) facing the welded portion (15) to prevent the jig (110) from being thermally deformed by the thermal energy of welding the electrode lead (13).

[0128] The groove (113) may be positioned adjacent to the end of the jig body (111), which is the other end of the jig body (111) opposite to the end of the jig body (111) to which the pallet connecting part (112) extends. The groove (113) may be positioned spaced apart from the end of the jig body (111), which is the other end of the jig body (111) opposite to the end of the jig body (111) to which the pallet connecting part (112) extends.

[0129] The groove (113) may be formed by being recessed so as to be stepped with respect to one side of the jig body (111) facing the welded portion (15) near the center of the jig body (111). The groove (113) may include a rectangular shape. However, it is not limited thereto.

[0130] The length of the groove (113) along the direction in which the jig (110) is inserted into the receiving portion (16) may be longer than the length of the weld portion (15). The width of the groove (113) along the direction in which the pallet connecting portion (112) extends from the jig body (111) to both sides may be greater than the width of the weld portion (15). Thus, through the groove (113), thermal deformation of the jig (110) caused by welding between the electrode leads (13) can be reduced.

[0131] The width of the groove (113) along the direction in which the pallet connecting part (112) extends from the jig body (111) to both sides may be smaller than the width of the jig body (111). The jig body (111) may include groove outer walls (111a) that form the sides of the groove (113) along the direction in which the pallet connecting part (112) extends from the jig body (111). The groove outer walls (111a) may be composed of two parts. However, it is not limited thereto.

[0132] The width of the outer wall (111a) of the groove along the direction in which the pallet connecting part (112) extends from the jig body (111) to both sides may be smaller than the width of the groove (113).

[0133] If the jig body (111) does not include a groove outer wall (111a) and the groove (113) is simply a stepped structure formed in a part of the jig body (111), then only the thickness (h) of the jig body (111) constituting the groove (113) along the direction in which the groove (113) faces the weld (15) can be reduced, and conversely, the thermal capacity of the jig body (111) is reduced due to the reduced thickness, so thermal deformation of the jig body (111) can easily occur.

[0134] According to the first embodiment of the present invention, the groove portion (113) includes a groove portion outer wall (111a) that forms both sides of the groove portion (113) in a stepped structure formed in a part of the jig body (111), so that all sides constituting the groove portion (113) can be formed.

[0135] Accordingly, the thickness (h) of the jig body (111) is not simply reduced through the groove (113) along the direction in which the groove (113) faces the weld (15), but the thickness (h) of the jig body (111) is maintained by the outer wall (111a) of the groove, thereby increasing the bending cross-sectional deformation moment in the thickness direction facing the weld (15) and reducing the thermal deformation rate of the jig body (111).

[0136] That is, the jig (110) according to the first embodiment of the present invention can reduce the direct influence of the thermal energy welding the weld portion (15) of the electrode lead (13) by including a groove portion (113) that is directly affected by the thermal energy welding the weld portion (15), and can increase the bending cross-sectional deformation moment in the thickness direction facing the weld portion (15) by the groove portion (111a) by including a groove portion outer wall (111a) that is formed by the groove portion (113) and is not directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13).

[0137] Accordingly, the thermal deformation rate of the entire jig body (111) can be reduced, and the usable period of the jig (110) can be extended.

[0138] The thickness (t) of the groove (113) along the direction in which the groove (113) faces the weld (15) may be 2 / 3 or less of the thickness (h) of the jig body (111). The thickness (h) of the jig body (111) along the direction in which the groove (113) faces the weld (15) may be 3 mm to 5 mm, and the thickness (t) of the groove (113) may be 1.5 mm to 2.5 mm. However, it is not limited thereto.

[0139] The jig (110) according to the first embodiment of the present invention may include a SiC material including silicon carbide. The jig (110) may include an S45C material including carbon steel. However, it is not limited thereto, and the jig (110) may include various materials to the extent that it can reduce the thermal deformation rate of the jig (110) caused by the thermal energy used to weld the weld portion (15) of the electrode lead (13).

[0140] For example, the jig (110) may include SUS304 material or SUS316 material, including general stainless steel (Steel Use Stainless) that constitutes the jig (110).

[0141] Since the SiC material has a low coefficient of thermal expansion and high rigidity, the thermal deformation rate of the jig (110) containing the SiC material can be reduced by the thermal energy used to weld the weld portion (15) of the electrode lead (13).

[0142] The S45C material has a high yield strength, so the thermal deformation rate of the jig (110) containing the S45C material can be reduced by the thermal energy used to weld the weld portion (15) of the electrode lead (13).

[0143] FIG. 9 is a drawing illustrating a jig including a plurality of grooves in an electrode lead welding jig device according to a second embodiment of the present invention. Referring to FIGS. 1 to 9, the jig (210) according to the second embodiment of the present invention may include a jig body (211), a pallet connecting part (212) extending from the jig body (211) to be connected to a pallet (120), and a groove (213) provided in the jig body (211) to prevent the jig (210) from being deformed by thermal energy welding the welding part (15) of the electrode lead (13).

[0144] The groove portion (213) may include a plurality of groove portions (213) arranged spaced apart from each other along the direction in which the jig (210) is inserted into the receiving portion (16). The plurality of groove portions (213) may be arranged in multiple numbers to correspond to a plurality of welding points for welding the welding portion (15) of the electrode lead (13). In FIG. 9, the plurality of groove portions (213) are shown as seven, but are not limited thereto.

[0145] The jig body (211) may include groove outer walls (211a) that form both sides of the groove (213) along the direction in which the pallet connecting part (212) extends from the jig body (211). The groove outer walls (211a) may be composed of two parts. However, they are not limited thereto.

[0146] The jig body (211) may include a groove partition (211b) arranged to connect two groove outer walls (211a) along the direction in which a pallet connecting part (212) extends from the jig body (111) to both sides to partition a plurality of groove parts (213). A plurality of groove partitions (211b) may be provided. In FIG. 9, the plurality of groove partitions (211b) are shown as six, but are not limited thereto.

[0147] Depending on the direction in which the jig (210) is inserted into the receiving portion (16), the length of the groove portion (213) may be longer than the length of the groove portion partition (211b).

[0148] That is, the jig (210) according to the second embodiment of the present invention includes a plurality of grooves (213) arranged to correspond to a welding point that is directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13), and by including a groove outer wall (211a) and a groove partition (211b) that are each configured and are not directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13), the bending cross-sectional deformation moment in the thickness direction facing the weld portion (15) can be increased by the groove outer wall (211a) and the groove partition (211b), and the thermal deformation rate of the jig body (211) can be further reduced. Accordingly, bending of the jig (210) due to thermal deformation can be prevented, and the usable period of the jig (210) can be extended.

[0149] Each of the multiple grooves (213) may have a rectangular shape. However, it is not limited thereto.

[0150] FIG. 10 is a drawing illustrating a jig including a groove and a reinforcing member in an electrode lead welding jig device according to a third embodiment of the present invention. Referring to FIG. 10, the jig (310) according to the third embodiment of the present invention may include a jig body (311), a pallet connecting part (312) extending from the jig body (311) to be connected to a pallet (120), and a groove (313) provided in the jig body (311) to prevent the jig (310) from being deformed by thermal energy that welds the welding part (15) of the electrode lead (13).

[0151] The jig body (311) may include groove outer walls (311a) that form both sides of the groove (313) along the direction in which the pallet connecting part (312) extends from the jig body (311). The groove outer walls (311a) may be composed of two. The groove (313) may include a rectangular shape. However, it is not limited thereto.

[0152] The jig (310) may include a reinforcing member (314) inserted into a groove (313) to reduce the thermal deformation rate of the jig (310) caused by thermal energy welding the weld portion (15) of the electrode lead (13) and to reinforce the rigidity of the jig (310). The reinforcing member (314) may correspond to the shape of the groove portion (313). The reinforcing member (314) may include a rectangular parallelepiped shape. However, it is not limited thereto.

[0153] The reinforcing member (314) can be inserted into the groove (313) so as to be detachable. The reinforcing member (314) can be fitted into the groove (313). However, it is not limited thereto, and the reinforcing member (314) can be formed integrally with the jig body (311) through methods such as injection molding while connected to the groove (313).

[0154] The material of the reinforcing member (314) may be different from the material of the jig body (311). The material of the jig body (311) may include a SiC material containing silicon carbide or an S45C material containing carbon steel. However, it is not limited thereto.

[0155] The material of the reinforcing member (314) may include SUS304 material or SUS316 material, including stainless steel. However, it is not limited thereto. Compared to SUS304 material, SUS316 material may have a reduced thermal energy absorption rate due to the addition of Mo components.

[0156] That is, the jig body (311) can be configured to include a material that has a relatively high cost but a low thermal deformation rate, and the reinforcing member (314) can be configured to include a material that has a higher thermal deformation rate than the jig body (311) but can reduce costs.

[0157] Accordingly, in the jig (310) according to the third embodiment of the present invention, the thermal deformation rate of the reinforcing member (314) inserted into the groove (313), which is directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13), may be relatively high, but the thermal deformation rate of the outer wall (311a) of the groove, which is not directly affected by the thermal energy forming the groove (313) and welding the weld portion (15) of the electrode lead (13), may be low. Therefore, the bending cross-sectional deformation moment in the thickness direction facing the weld portion (15) may be increased by the outer wall (311a) of the groove, and the thermal deformation rate of the jig body (311) may be reduced while simultaneously reducing costs.

[0158] In addition, by configuring the reinforcing member (314) to be separable from the groove (313), additional costs can be reduced and the usable period of the jig (110) can be extended by replacing only the reinforcing member (314) from the jig body (111) while considering the usable period of the reinforcing member (314) by continuous welding.

[0159] FIG. 11 is a drawing illustrating a jig including a groove portion in an electrode lead welding jig device according to a fourth embodiment of the present invention. Referring to FIG. 11, the jig (410) according to the fourth embodiment of the present invention may include a jig body (411), a pallet connecting portion (412) extending from the jig body (411) to be connected to a pallet (120), and a groove portion (413) provided in the jig body (411) to prevent the jig (410) from being deformed by thermal energy welding the welding portion (15) of the electrode lead (13).

[0160] The jig body (411) may include groove outer walls (411a) that form both sides of the groove (413) along the direction in which the pallet connecting part (412) extends from the jig body (411). The groove outer walls (411a) may be composed of two parts. However, they are not limited thereto.

[0161] The groove (413) may include a trapezoidal cross-section. The groove (413) may include a trapezoidal cross-section along the direction in which the pallet connecting part (412) extends from the jig body (411) to both sides. That is, the two outer walls (411a) of the groove may be configured to be inclined.

[0162] Two outer walls of the groove (411a) may be configured to be inclined toward the center of the bottom surface of the groove (413), which is directly affected by the thermal energy that forms the groove (413) and welds the welded portion (15) of the electrode lead (13). Two outer walls of the groove (411a) may be configured to be inclined inward toward the bottom surface of the groove (413).

[0163] However, it is not limited to this, and the inner wall of the jig body (411) that connects the two outer walls of the groove (411a) and forms the groove (413) can also be configured to be inclined together with the two outer walls of the groove (411a).

[0164] That is, the inner wall of the jig body (411) that forms the groove (413) together with the outer wall (411a) of the groove may also be configured to slope inward toward the bottom surface of the groove (413), and the groove (413) may include a trapezoidal cross-section along the direction in which the jig (410) is inserted into the receiving portion (16). However, it is not limited thereto.

[0165] A jig (410) according to the fourth embodiment of the present invention minimizes the area of ​​the groove (413) that is directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13), while maximizing the area of ​​the outer wall (411a) of the groove and the inner wall of the jig body (411) that are not directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13) and the groove (413), thereby increasing the bending cross-sectional deformation moment in the thickness direction facing the weld portion (15) by means of the outer wall (411a) of the groove and the inner wall of the jig body (411).

[0166] Accordingly, the thermal deformation rate of the entire jig body (411) can be reduced, and the usable period of the jig (410) can be extended.

[0167] Hereinafter, a method for manufacturing a battery pack using an electrode lead welding jig device according to a first embodiment of the present invention is briefly described with reference to FIGS. 1 to 11.

[0168] A method for manufacturing a battery pack (2000) manufactured according to the first embodiment of the present invention may form a battery cell stack (1) by stacking a plurality of battery cells (10) including electrode leads (13), and may place lead frames (20) on one side or both sides of the battery cell stack (1).

[0169] A method for manufacturing a battery pack (2000) can form an overlapping portion (14) by passing a first electrode lead (13a) protruding from a first battery cell (10a) among a plurality of battery cells (10) and a second electrode lead (13b) protruding from a second battery cell (10b) among a plurality of battery cells (10) through a slit (21) formed in a lead frame (20), bending them, and then overlapping them.

[0170] Specifically, the second electrode lead (13b) of the second battery cell (10b) can be inserted into the second slit (21b) among the plurality of slits (21) formed in the lead frame (20) and then bent. At this time, the second electrode lead (13b) can be bent so as to cover the bonding plate (32).

[0171] Next, the first electrode lead (13a) of the first battery cell (10a) can be inserted into the first slit (21a) among the plurality of slits (21) formed in the lead frame (20) and then bent. At this time, the first electrode lead (13a) can be bent so as to cover the bonding plate (32) and the second electrode lead (13b) together.

[0172] According to the first embodiment of the present invention, since the first electrode lead (13a) and the second electrode lead (13b) can be joined while simultaneously joining the second electrode lead (13b) and the joining plate (32), the HV connection between the plurality of electrode leads (13) and the LV connection between the electrode lead (13) and the sensing assembly (30) can be performed at once without being performed separately, thus allowing for improved manufacturing processability.

[0173] In addition, a separate busbar for HV connection or LV connection can be removed, allowing for the manufacture of a battery pack (2000) with a more compact configuration.

[0174] Meanwhile, the lead frame (20) included in the battery pack (2000) manufactured according to the first embodiment of the present invention may have an opening (23) formed in the center of the support portion (22), and the side of the opening (23) facing the overlapping portion (14) may be open.

[0175] When welding is performed between the first electrode lead (13a) and the second electrode lead (13b), an opening (23) may be positioned to correspond to the weld (15) formed by the first electrode lead (13a) and the second electrode lead (13b) during the welding step to prevent damage that may be applied to the lead frame (20).

[0176] According to the first embodiment of the present invention, the method of manufacturing a battery pack (2000) can vertically raise a jig (110) to insert it into a receiving portion (16) to prevent damage to the battery cell stack (1) by the thermal energy used to weld the weld portion (15), weld the weld portion (15) of the electrode lead (13), and then vertically lower the jig (110) from the receiving portion (16). Through this, welding between the electrode leads (13) of the battery pack (2000) can be performed.

[0177] A method for manufacturing a battery pack (2000) manufactured according to the first embodiment of the present invention may be configured to include a groove (113) provided in a jig body (111) facing the welded portion (15) so as to prevent the jig (110) inserted into the receiving portion (16) from being thermally deformed by the thermal energy welding the welded portion (15).

[0178] All sides constituting the groove (113) can be formed by including groove outer walls (111a) constituting both sides of the groove (113) in a stepped structure formed in a part of the jig body (111).

[0179] A jig (110) according to the first embodiment of the present invention includes a groove (113) that is directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13), and an outer wall (111a) of the groove that is not directly affected by the thermal energy welding the weld portion (15) of the electrode lead (13) and the groove portion (113). By the outer wall (111a) of the groove, the bending cross-sectional deformation moment in the thickness direction facing the weld portion (15) can be increased, and the thermal deformation rate of the jig body (111) can be reduced. Accordingly, the usable period of the jig (110) can be extended.

[0180] Although the technical concept of the present invention has been explained above through specific embodiments, the scope of the present invention is not limited to these embodiments.

[0181] Various embodiments that can be modified or varied by a person skilled in the art, within the scope of not departing from the gist of the technical concept of the present invention as specified in the patent claims, shall also be deemed to fall within the scope of the rights of the present invention.

Claims

1. An electrode lead welding jig device configured to weld a battery cell stack in which a plurality of battery cells, each including a battery case and an electrode lead protruding outward from the battery case, are stacked. A jig comprising a jig body disposed between the electrode leads and the battery case to prevent thermal energy for welding the electrode leads of the plurality of adjacent battery cells to each other from being transferred to the plurality of battery cells toward the battery case; and A pallet connected to the lower part of the jig to fix the jig; including The above jig is, A pallet connecting part extending from the jig body to be connected to the above pallet, and An electrode lead welding jig device further comprising a groove provided in the jig body to prevent the jig from being deformed by the thermal energy used to weld the electrode lead.

2. In Paragraph 1, The electrode lead of each of the adjacent plurality of battery cells is, A welded portion configured to be bent toward each other and overlapped to be welded by penetrating a slit provided in a lead frame configured to support the electrode lead, and a receiving portion provided between the lead frame and the welded portion can be formed. The above jig is an electrode lead welding jig device inserted into the receiving portion such that the groove portion faces the welding portion.

3. In Paragraph 2, An electrode lead welding jig device configured such that the above-mentioned groove is recessed to be stepped with respect to one surface of the jig body facing the above-mentioned welding portion.

4. In Paragraph 2, An electrode lead welding jig device in which the length of the groove along the direction in which the groove is inserted into the receiving portion is longer than the length of the welding portion.

5. In Paragraph 2, An electrode lead welding jig device in which the thickness of the groove portion along the direction facing the weld portion is 2 / 3 or less of the thickness of the jig body.

6. In Paragraph 2, An electrode lead welding jig device having a thickness of 3mm to 5mm along the direction in which the groove portion faces the weld portion, and a thickness of 1.5mm to 2.5mm along the groove portion.

7. In Paragraph 1, The above jig is an electrode lead welding jig device comprising a SiC material containing silicon carbide or an S45C material containing carbon steel.

8. In Paragraph 2, The above-mentioned groove portion is an electrode lead welding jig device comprising a plurality of groove portions arranged to be spaced apart from each other along the direction in which the jig is inserted into the receiving portion.

9. In Paragraph 1, The above-described jig is an electrode lead welding jig device further comprising a reinforcing member inserted into the groove to reduce the thermal deformation rate of the jig caused by the thermal energy of welding the electrode lead.

10. In Paragraph 9, The electrode lead welding jig device in which the material of the reinforcing member is different from the material of the jig body.

11. In Paragraph 10, The material of the above jig body includes SIC material containing silicon carbide or S45C material containing carbon steel, and The above reinforcing member is an electrode lead welding jig device comprising SUS304 material or SUS316 material, including stainless steel (Steel Use Stainless).

12. In Paragraph 1, The above-mentioned battery cell stack is a pouch-type battery cell stack that is directly accommodated in a pack case to form a battery pack, and is an electrode lead welding jig device comprising such a stack.

13. An electrode lead welding jig device configured to weld a battery cell stack in which a plurality of battery cells including electrode leads are stacked, A jig provided to prevent thermal energy for welding the electrode leads of the plurality of adjacent battery cells to one another from being transferred to a lead frame configured to support the electrode lead and disposed on one side of the electrode lead; and A pallet connected to the jig to move the jig vertically; including The above jig is, A jig body movably inserted between the electrode lead and the lead frame, A pallet connecting part extending from the jig body to be connected to the above pallet, and An electrode lead welding jig device comprising a groove formed by being recessed from the jig body to reduce the thermal deformation rate of the jig caused by the thermal energy of welding the electrode lead.

14. In Paragraph 13, The above-mentioned groove is an electrode lead welding jig device positioned adjacent to the other end of the jig body, which is opposite to the pallet connection portion extending from one end of the jig body.

15. In Paragraph 13, The above-mentioned groove is an electrode lead welding jig device including a trapezoidal cross-section.

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