Electrode lead welding jig, battery cell unit produced using same, and battery pack and vehicle comprising battery cell unit

Abstract

Disclosed are an electrode lead welding jig, a battery cell unit produced using same, and a battery pack and a vehicle comprising the battery cell unit. The electrode lead welding jig according to one embodiment of the present invention is an electrode lead welding jig used for welding a plurality of electrode leads of a battery cell unit including the electrode leads. The electrode lead welding jig comprises: a support member inserted into a busbar frame in which an insertion groove is formed, the support member supporting a busbar and the electrode leads; and a mask member in contact with the electrode leads to press the electrode leads.

Description

Electrode lead welding jig and a battery cell unit produced using the same, a battery pack including the battery cell unit, and an automobile

[0001] This application is a priority application for Korean Patent Application No. 10-2025-0009738 filed on January 22, 2025, and all contents disclosed in the specification and drawings of said application are incorporated into this application by reference.

[0002] The present invention relates to an electrode lead welding jig, a battery cell unit produced using the same, a battery pack including the battery cell unit, and an automobile. More specifically, the invention relates to an electrode lead welding jig capable of preventing welding defects of electrode leads, a battery cell unit produced using the same, a battery pack including the battery cell unit, and an automobile.

[0003] Generally, a secondary battery refers to a battery capable of repeated charging and discharging, such as lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The battery cells corresponding to the most basic secondary batteries can provide an output voltage of approximately 2.5V to 4.2V.

[0004] Recently, as these battery cells are applied to devices requiring high output voltage and large charging capacity, such as electric vehicles or Energy Storage Systems (ESS), battery modules configured by connecting multiple battery cells in series, parallel, or a combination of series and parallel, and battery packs configured by connecting these battery modules again in series, parallel, or a combination of series and parallel are widely used.

[0005] Lithium secondary batteries are currently in the spotlight due to their advantages, such as high operating voltage and significantly higher energy density, but because they use organic electrolytes, if the lithium secondary battery is overcharged, it causes overcurrent and overheating, which in severe cases can lead to explosions or fires caused by ignition.

[0006] Various types of secondary batteries may include a battery module in which a plurality of battery cells are stacked and inserted into a module case equipped with a module case capable of protecting the battery cells, and a battery pack containing a plurality of battery modules.

[0007] A battery cell includes electrode leads, and the electrode leads can be joined to each other by welding; in this case, a welding jig can be used to weld the electrode leads.

[0008] FIG. 1 is a schematic diagram illustrating the welding of a conventional busbar and electrode lead, and FIG. 2 is a cross-sectional view taken along A-A' of FIG. 1. In FIG. 2, only the busbar, the negative lead, and the positive lead are shown.

[0009] Referring to FIG. 1, a busbar (2) is positioned on the upper side of a busbar frame (1), a negative lead (3) is positioned on the upper side of the busbar (2), and a positive lead (4) is positioned on the upper side of the negative lead (3). That is, the busbar (2), the negative lead (3), and the positive lead (4) overlap, and a welding mask (5) contacts the upper side of the positive lead (4) to press both ends of the positive lead (4) (see F1 and F2). In FIG. 1, the mask (5) is schematically illustrated.

[0010] In this case, as shown in FIG. 2, due to the pressure applied through the mask (5), the bus bar (2), the cathode lead (3), and the positive lead (4) are in close contact with each other without a gap at both ends of the positive lead (4), but at the center of the positive lead (4), the bus bar (2), the cathode lead (3), and the positive lead (4) are separated from each other and a gap occurs.

[0011] However, if welding is performed while there is a gap between the busbar (2), the negative lead (3), and the positive lead (4), welding defects occur, and the quality of the battery cell is degraded.

[0012] Accordingly, the technical problem to be solved by the present invention is to provide an electrode lead welding jig capable of preventing welding defects between a bus bar and a plurality of electrode leads, a battery cell unit produced using the same, a battery pack including the battery cell unit, and an automobile.

[0013] In addition, the invention provides an electrode lead welding jig capable of improving the quality of a battery cell unit by preventing such welding defects of the electrode lead, a battery cell unit produced using the same, a battery pack including the battery cell unit, and an automobile.

[0014] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by those skilled in the art from the description of the invention below.

[0015] According to one aspect of the present invention, an electrode lead welding jig used for welding a plurality of electrode leads of a battery cell unit including electrode leads may be provided, comprising: a busbar frame having an insertion groove formed therein and a support member on which the busbar and electrode leads are supported; and a mask member that contacts the electrode leads and presses the electrode leads.

[0016] In one embodiment, the support member may be formed with different heights on one side and the other side.

[0017] In one embodiment, the support member may include two ends having a preset height; and a center having a height higher than that of the two ends.

[0018] In one embodiment, the height of the central part may be the highest, and the height may decrease from the central part toward both ends.

[0019] In one embodiment, a damage prevention groove may be formed in the center to prevent damage caused by welding.

[0020] In one embodiment, the support member is inserted into the insertion groove of the busbar frame, and the central part protrudes upward from the busbar frame, and the busbar and the electrode lead may be located on the upper side of the support member.

[0021] In one embodiment, the bus bar may be positioned on the upper side of the support member, a plurality of first electrode leads may be positioned on the upper side of the bus bar, and a plurality of second electrode leads may be positioned on the upper side of the plurality of first electrode leads.

[0022] In one embodiment, a plurality of first electrode leads and a plurality of second electrode leads, each bent from a plurality of battery cells, may be positioned overlappingly on a single busbar.

[0023] In one embodiment, the support member may be configured to press the bus bar, the plurality of first electrode leads, and the plurality of second electrode leads.

[0024] In one embodiment, the mask member may include: a contact portion that contacts the electrode lead and has a welding hole formed therein; an extension portion that extends from the contact portion and transmits a pressure to the electrode lead; and an elastic portion coupled to the extension portion.

[0025] In one embodiment, the electrode lead is welded at a plurality of welding points along the longitudinal direction, and the contact portion may be formed along the longitudinal direction to correspond to the plurality of welding points.

[0026] In one embodiment, the extension portion is formed as a pair, and the pair of extension portions may each extend from both ends of the contact portion.

[0027] Meanwhile, according to another aspect of the present invention, a battery cell unit produced using the aforementioned electrode lead welding jig may be provided, and a battery pack comprising at least one of the aforementioned battery cell units may be provided, and an automobile comprising at least one of the aforementioned battery cell units may be provided.

[0028] The embodiments of the present invention have the effect of preventing welding defects between the bus bar and a plurality of electrode leads.

[0029] In addition, it has the effect of improving the quality of the battery cell unit by preventing welding defects of such electrode leads.

[0030] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below.

[0031] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0032] Figure 1 is a schematic diagram illustrating the welding of a conventional bus bar and electrode lead.

[0033] Figure 2 is a cross-sectional view taken along A-A' of Figure 1.

[0034] FIG. 3 is a perspective view of welding using an electrode lead welding jig according to the first embodiment of the present invention.

[0035] Fig. 4 is an exploded perspective view of Fig. 3.

[0036] FIG. 5 is a perspective view of a support member in an electrode lead welding jig according to the first embodiment of the present invention.

[0037] FIG. 6 is a front view of a support member in an electrode lead welding jig according to the first embodiment of the present invention.

[0038] Figure 7 is a cross-sectional view taken along B-B' of Figure 3.

[0039] FIG. 8 is a cross-sectional view of welding using an electrode lead welding jig according to a second embodiment of the present invention.

[0040] Figure 9 is an enlarged view of part C of Figure 8.

[0041] FIG. 10 is a drawing of a battery pack according to a first embodiment, comprising a battery cell unit produced using an electrode lead welding jig according to each embodiment of the present invention.

[0042] FIG. 11 is a drawing of a battery pack according to a second embodiment, comprising a battery cell unit produced using an electrode lead welding jig according to each embodiment of the present invention.

[0043] FIG. 12 is a drawing illustrating a vehicle including the battery pack of FIG. 10 or the battery pack of FIG. 11.

[0044] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all aspects of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0045] In the drawings, the size of each component or specific part constituting the component is exaggerated, omitted, or schematically depicted for convenience and clarity of explanation. Accordingly, the size of each component does not entirely reflect its actual size. If it is determined that a detailed description of related known functions or configurations could unnecessarily obscure the essence of the invention, such description shall be omitted.

[0046] As used in this specification, the terms "combination" or "connection" include not only cases where one member and another member are directly joined or directly connected, but also cases where one member is indirectly joined or indirectly connected to another member through a connecting member.

[0047] Meanwhile, contents common to parts described in any one embodiment of the present invention may also be applied to other embodiments. For example, contents common to parts described in the first embodiment of the second embodiment may be replaced by the description of the first embodiment described above, and such common contents may also be applied to the second embodiment. Furthermore, contents described in the second embodiment that are applicable to the first embodiment may also be applied to the first embodiment. The same applies to other embodiments.

[0048] FIG. 3 is a perspective view of welding using an electrode lead welding jig according to the first embodiment of the present invention, FIG. 4 is an exploded perspective view of FIG. 3, FIG. 5 is a perspective view of a support member in the electrode lead welding jig according to the first embodiment of the present invention, FIG. 6 is a front view of a support member in the electrode lead welding jig according to the first embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along B-B' of FIG. 3. In FIG. 2, only the busbar, the first electrode lead, and the second electrode lead are shown. Also, in FIG. 6, the busbar frame (21) is indicated by a dotted line.

[0049] An electrode lead welding jig (10) according to one embodiment of the present invention relates to a welding jig used for welding a plurality of electrode leads of a battery cell unit (20) including electrode leads.

[0050] Here, the battery cell unit (20) includes a plurality of battery cells. The plurality of electrode leads of the battery cell unit (20) can be welded by various methods, for example, by laser welding (see L in FIG. 9). For convenience of explanation, the following description will focus on the case where the plurality of electrode leads of the battery cell unit (20) are welded by laser welding.

[0051] Meanwhile, the first electrode lead (23) described below may be a negative lead or a positive lead. Likewise, the second electrode lead (24) may be a positive lead or a negative lead. If the first electrode lead (23) is a negative lead, the second electrode lead (24) is a positive lead, and if the first electrode lead (23) is a positive lead, the second electrode lead (24) is a negative lead.

[0052] Referring to FIGS. 3 and 4, an electrode lead welding jig (10) according to one embodiment of the present invention includes a support member (100) and a mask member (200).

[0053] The support member (100) is inserted into the busbar frame (21) of the battery cell (20, see FIG. 10), and the busbar (22) and electrode leads (23, 24) are supported by the support member (100).

[0054] Here, the busbar frame (21) is a frame that supports a busbar (22) that is electrically connected to electrode leads (23, 24). Also, referring to FIGS. 3 and 4, an insertion groove (25) may be formed in the busbar frame (21). Also, referring to FIG. 3, the support member (100) supports the busbar (22) and the electrode leads (23, 24) while inserted into the insertion groove (25) formed in the busbar frame (21).

[0055] The support member (100) may be formed with different heights on one side and the other side. For example, as shown in FIGS. 5 and 6, the support member (100) may include two ends (110) and a center (120). Here, the two ends (110) of the support member (100) have a preset height. The two ends (110) of the support member (100) may have the same height. And, the center (120) of the support member (100) may be configured to have a higher height than the two ends (110) of the support member (100).

[0056] For example, the height of the center (120) of the support member (100) may be the highest, and the height may decrease as it goes from the center (120) of the support member (100) to both ends of the support member (100).

[0057] When the support member (100) has the shape as described above, the center (120) of the support member (100) may protrude upward above the busbar frame (21) (the center (120) protrudes upward above the busbar frame (21) indicated by the dotted line in FIG. 6).

[0058] And, when the bus bar (22), the first electrode lead (23), and the second electrode lead (24) are positioned on the upper side of the support member (100), even if the mask part described later presses the second electrode lead (24), a gap is not formed between the bus bar (22), the first electrode lead (23), and the second electrode lead (24) as shown in FIG. 7.

[0059] If welding is performed in this state, welding defects between the bus bar (22) and the multiple electrode leads (23, 24) can be prevented. In addition, by preventing such welding defects of the electrode leads (23, 24), the quality of the battery cell unit (20) can be improved.

[0060] Referring to FIG. 5, a damage prevention groove (121) may be formed in the center (120) of the support member (100). For example, the support member (100) may be damaged by the high temperature generated during laser welding. However, as in one embodiment of the present invention, if a damage prevention groove (121) is formed in the center (120) of the support member (100), the support member (100) may be prevented from being damaged by welding.

[0061] The mask member (200) is configured to protect a part other than the welding point (27) where welding is performed during welding. Referring to FIG. 3, the mask member (200) comes into contact with electrode leads (23, 24), for example, a second electrode lead (24), and presses the second electrode lead (24).

[0062] Referring to FIGS. 3 and 4, the mask member (200) can be configured in various ways, for example, it may be configured to include a contact portion (210), an extension portion (220), and an elastic portion (230).

[0063] The contact portion (210) is in contact with, for example, the second electrode lead (24), and a welding hole (211) is formed in the contact portion (210). Then, during laser welding, the laser can weld at the welding point (27, see FIG. 4) through the welding hole (211) of the contact portion (210). By doing so, the electrode leads (23, 24) and the bus bar (22) can be welded.

[0064] And, for example, the electrode leads (23, 24) can be welded at a plurality of welding points (27) along the longitudinal direction. Here, the plurality of welding points (27) can be formed along the X direction of FIG. 4. And, the longitudinal direction may mean the X direction of FIG. 4 corresponding to the plurality of welding points (27).

[0065] The contact portion (210) can be formed in the longitudinal direction to correspond to a plurality of welding points (27). That is, as shown in FIG. 4, when a plurality of welding points (27) are formed in the longitudinal direction, the contact portion (210) can also be formed in the longitudinal direction.

[0066] The extension portion (220) extends from the contact portion (210), and the pressure is transmitted to the electrode leads (23, 24). For example, the extension portion (220) may be formed as a pair, and the pair of extension portions (220) may each extend from both ends of the contact portion (210). And, when a pressure member (240) is coupled to the elastic portion (230), the pressure of the pressure member (240) is transmitted to the pair of extension portions (220).

[0067] And, the elastic part (230) is coupled to the extension part (220). The elastic part (230) can be formed in various shapes or materials having elasticity, and, for example, can be a coil spring as in FIG. 3, but is not limited thereto.

[0068] A pressurizing member (240) that pressurizes the elastic member (230) may be coupled to the elastic member (230), and the pressurizing member (240) may be configured to pressurize the elastic member (230) (see F3 and F4 in FIG. 3). However, the pressurizing member (240) is not a mandatory component. That is, even without the pressurizing member (240), a pressurizing force can be directly provided to the elastic member (230).

[0069] In FIG. 3, when the elastic part (230) is pressed and elastically contracted, the contact part (210) presses the second electrode lead (24) through the extension part (220). Here, since a pair of extension parts (220) extend from each end of the contact part (210), when the contact part (210) is pressed through the extension part (220), the ends of the contact part (210) receive more force than the center of the contact part (210).

[0070] At this time, the support member (100) is inserted into the insertion groove (25) of the busbar frame (21), and the center (120) of the support member (100) protrudes upward from the busbar frame (21) (see FIG. 6), so the support member (100) presses the busbar (22), the first electrode lead (23), and the second electrode lead (24) from the lower side to the upper side.

[0071] And, even if the mask member (200) presses the bus bar (22), the first electrode lead (23), and the second electrode lead (24) from the upper side of the second electrode lead (24), the support member (100) presses the bus bar (22), the first electrode lead (23), and the second electrode lead (24) from the lower side to the upper side, so a gap is not formed between the bus bar (22), the first electrode lead (23), and the second electrode lead (24) as in FIG. 7.

[0072] And, in this way, if the bus bar (22), the first electrode lead (23), and the second electrode lead (24) are welded without a gap being formed between the bus bar (22), the first electrode lead (23), and the second electrode lead (24), the welding defects of the bus bar (22), the first electrode lead (23), and the second electrode lead (24) can be prevented.

[0073] FIG. 8 is a cross-sectional view of welding using an electrode lead welding jig according to a second embodiment of the present invention, and FIG. 9 is an enlarged view of part C of FIG. 8.

[0074] Referring to FIG. 8, there is a difference from the first embodiment in which there is one first electrode lead (23) and one second electrode lead (24) in that there are two first electrode leads (23) and two second electrode leads (24).

[0075] That is, the electrode lead welding jig (10) according to the second embodiment of the present invention is an embodiment that applies even when there are multiple first electrode leads (23) and second electrode leads (24). However, it is not limited to cases where there are two first electrode leads (23) and two second electrode leads (24), and the electrode lead welding jig (10) according to the second embodiment of the present invention can be applied even when there are two or more first electrode leads (23) and two or more second electrode leads (24).

[0076] Referring to FIG. 8, a bus bar (22) is positioned on the upper side of a support member (100), and a plurality of first electrode leads (23a, 23b) (two first electrode leads (23a, 23b) in FIG. 8) are positioned on the upper side of the bus bar (22), and a plurality of second electrode leads (24a, 24b) (two second electrode leads (24a, 24b) in FIG. 8) are positioned on the upper side of the plurality of first electrode leads (23a, 23b).

[0077] Here, a plurality of first electrode leads (23a, 23b) and a plurality of second electrode leads (24a, 24b), each bent from a plurality of battery cells, are configured to overlap and position on a single bus bar (22).

[0078] And, even if the mask member (200) presses the bus bar (22), the plurality of first electrode leads (23a, 23b), and the plurality of second electrode leads (24a, 24b) from the upper side, the support member (100) presses the bus bar (22), the plurality of first electrode leads (23a, 23b), and the plurality of second electrode leads (24a, 24b) from the lower side to the upper side, so as shown in FIG. 9, no gap is generated between the bus bar (22), the plurality of first electrode leads (23a, 23b) (two first electrode leads (23a, 23b) in FIG. 9), and the plurality of second electrode leads (24a, 24b) (two second electrode leads (24a, 24b) in FIG. 9), and when laser welding (L) is performed in this state, the bus bar (22) and the plurality of first electrodes It is possible to prevent welding defects of the leads (23a, 23b) and the plurality of second electrode leads (24a, 24b).

[0079] FIG. 10 is a drawing of a battery pack according to a first embodiment including a battery cell unit produced using an electrode lead welding jig according to each embodiment of the present invention, and FIG. 11 is a drawing of a battery pack according to a second embodiment including a battery cell unit produced using an electrode lead welding jig according to each embodiment of the present invention.

[0080] Referring to FIG. 10, the battery pack (40) can be configured so that the battery cell unit (20) is directly housed in the pack case (41) of the battery pack (40) after removing the module case (31, see FIG. 11).

[0081] According to this method, the weight and volume occupied by the module case (31) are reduced, and since the battery cell unit (20) can be additionally stored in the space occupied by the module case (31) of the battery module (30) within the battery pack (40), space efficiency is increased and the battery capacity is improved.

[0082] Here, a cell cover (not shown) that supports the battery cell unit (20) so that the battery cell unit (20) can be directly stored in the pack case (41) may be provided. The cell cover may have various shapes, and for example, may be configured in an 'n' shape, a 'u' shape, or a 'U' shape that surrounds three sides of at least one battery cell among the battery cell units (20), but is not limited thereto.

[0083] Also, referring to FIG. 11, a battery cell unit (20) may be housed in a module case (31) of a battery module (30), and the module case (31) in which the battery cell unit (20) is housed may be housed in a pack case (41) to form a battery pack (40).

[0084] Meanwhile, referring to FIG. 10 and FIG. 11 respectively, a battery pack (40) according to the first embodiment of the present invention or a battery pack (40) according to the second embodiment of the present invention may include one or more battery cell units (20). Here, the battery cell unit (20) is a battery cell unit (20) produced using an electrode lead welding jig (10) according to each embodiment of the present invention as described above.

[0085] Additionally, the battery pack (40) may further include a pack case (41) for housing a battery cell unit (20), and various devices for controlling the charging and discharging of the battery cell unit (20), such as a BMS, a current sensor, a fuse, etc.

[0086] FIG. 12 is a drawing illustrating a vehicle including the battery pack of FIG. 10 or the battery pack of FIG. 11.

[0087] Referring to FIG. 12, a vehicle (50) according to one embodiment of the present invention may include one or more battery cell units (20) produced using an electrode lead welding jig (10) according to each embodiment of the present invention, a battery pack (40) according to the first embodiment, or a battery pack (40) according to the second embodiment. Here, the vehicle (50) includes various vehicles configured to use electricity, such as, for example, an electric vehicle or a hybrid vehicle.

[0088] In this specification, where terms indicating directions such as up, down, left, and right are used, these terms are used merely for convenience of explanation, and it is obvious to those skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0089] Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims set forth below by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed above should be considered in an illustrative rather than a restrictive sense. That is, the scope of the true technical spirit of the present invention is indicated in the claims, and all variations within the equivalent scope thereof should be interpreted as being included in the present invention.

[0090] The present invention relates to an electrode lead welding jig, a battery cell unit produced using the same, a battery pack including the battery cell unit, and an automobile, and is particularly applicable to industries related to secondary batteries.

Claims

1. An electrode lead welding jig used for welding a plurality of electrode leads of a battery cell unit including electrode leads, A support member inserted into a busbar frame having an insertion groove and supporting a busbar and an electrode lead; and An electrode lead welding jig comprising a mask member that contacts the electrode lead and presses the electrode lead.

2. In Paragraph 1, The electrode lead welding jig is characterized by the above-mentioned support member having different heights on one side and the other side.

3. In Paragraph 2, The above support member is, Both ends having a preset height; and An electrode lead welding jig characterized by including a central portion having a height higher than that of the above-mentioned two ends.

4. In Paragraph 3, An electrode lead welding jig characterized by having the highest height at the center and decreasing height from the center toward both ends.

5. In Paragraph 3, An electrode lead welding jig characterized by having a damage-prevention groove formed in the central part to prevent damage by welding.

6. In Paragraph 3, The above support member is inserted into the insertion groove of the busbar frame, and the central part protrudes upward from the busbar frame. An electrode lead welding jig characterized by the bus bar and the electrode lead being positioned on the upper side of the support member.

7. In Paragraph 6, An electrode lead welding jig characterized by being configured such that the bus bar is positioned on the upper side of the support member, a plurality of first electrode leads are positioned on the upper side of the bus bar, and a plurality of second electrode leads are positioned on the upper side of the plurality of first electrode leads.

8. In Paragraph 7, An electrode lead welding jig characterized by a plurality of first electrode leads and a plurality of second electrode leads, each bent from a plurality of battery cells, being positioned overlappingly on a single busbar.

9. In Paragraph 7, An electrode lead welding jig characterized in that the support member is configured to press the bus bar, the plurality of first electrode leads, and the plurality of second electrode leads.

10. In Paragraph 1, The above mask member is, A contact portion that contacts the electrode lead and has a weld hole formed therein; An extension portion extending from the above contact portion and transmitting pressure to the electrode lead; and An electrode lead welding jig characterized by including an elastic part coupled to the extension part.

11. In Paragraph 10, The above electrode leads are welded at multiple welding points along the longitudinal direction, and An electrode lead welding jig characterized in that the above contact portion is formed in the longitudinal direction to correspond to the plurality of welding points.

12. In Paragraph 11, An electrode lead welding jig characterized in that the above extension portions are formed as a pair, and the pair of extension portions each extend from both ends of the contact portion.

13. A battery cell unit produced using an electrode lead welding jig according to any one of claims 1 to 12.

14. A battery pack comprising at least one battery cell unit according to paragraph 13.

15. An automobile comprising at least one battery cell unit according to paragraph 13.

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