Battery cell, and battery pack and vehicle including same

Abstract

The present disclosure relates to a battery cell including: an electrode assembly configured by winding a first electrode, a second electrode, and a separator interposed therebetween around a winding axis; a housing configured to accommodate the electrode assembly through an opening formed on one side, having a closed portion formed on the other side, and configured to be electrically connected to the second electrode; and a lid assembly configured to cover the opening of the housing, and including a lid having a first hole, an insulating gasket configured to be inserted at least partially into the first hole and having a second hole, and a terminal configured to be inserted at least partially into the second hole.

Description

Battery cells and battery packs containing these battery cells and automobiles

[0001] The present invention relates to a battery cell, a battery pack including the battery cell, and an automobile.

[0002] This application is a priority claim application for Korean Patent Application No. 10-2024-0134160 filed on October 2, 2024, and all contents disclosed in the specification and drawings of said application are incorporated into this application by reference.

[0003] Secondary battery cells, which possess electrical characteristics such as high energy density and high applicability across product groups, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by electric power sources. These secondary battery cells are attracting attention as a new energy source for enhancing eco-friendliness and energy efficiency, as they possess not only the primary advantage of drastically reducing the use of fossil fuels but also the advantage of generating no by-products from energy use.

[0004] Depending on the charge and discharge capacity required by electric vehicles (EVs) or hybrid electric vehicles (HEVs), battery packs are sometimes configured by connecting multiple battery cells in series or parallel. In this case, it is common practice to first assemble a battery module containing at least one battery cell, and then use this module to add other components to form a battery pack or battery rack. Alternatively, recently, cell-to-pack battery packs are also being manufactured, in which multiple battery cells are directly housed within a pack housing without modularization.

[0005] There is an increasing demand for the use of metal can-type cells as battery cells for automotive battery packs. The metal can can be prismatic or cylindrical. Cylindrical battery cells have a structure in which a jelly-roll type electrode assembly with a central hole in the core is housed inside a cylindrical can by winding a laminate of a first electrode, a second electrode, and a separator around a winding axis, and they offer the advantage of being more robust against shock and temperature than pouch-type battery cells.

[0006] In a conventional cylindrical battery cell, the first electrode of the electrode assembly is electrically connected to the housing. Since the terminal electrically connected to the second electrode of the electrode assembly is joined by riveting into a through hole formed on the closed surface of the housing, the conventional battery cell includes a riveted terminal.

[0007] In this case, to join the rivet terminal and the electrode assembly, an ultrasonic welding rod was inserted into the center hole of the electrode assembly from the opening side of the housing, and ultrasonic welding was performed from the inside of the housing.

[0008] However, as in conventional methods, there was a problem in that the separator of the electrode assembly could be damaged by spatter generated during ultrasonic welding. In addition, since it is difficult to reduce the diameter of the ultrasonic welding rod, the center hole of the electrode assembly must be larger than a certain size, which limits the increase in the energy density of the electrode assembly.

[0009] Furthermore, there were limitations to increasing the vertical volume of the electrode assembly due to the presence of rivet terminals inside the housing and an insulator for insulating the housing and the second electrode.

[0010] Furthermore, in the manufacturing of conventional battery cells, it is currently difficult to increase productivity and reduce costs due to the diverse and complex shapes of parts inside the housing and the complex processes.

[0011] As such, measures are required to simplify the assembly process between components to improve productivity or processability and to increase the energy density of battery cells.

[0012] Accordingly, the present invention is designed to solve the problems described above and provides a battery cell capable of increasing productivity or processability during the manufacturing of the battery cell and increasing the energy density of the battery cell, a battery pack including the same, and an automobile.

[0013] However, the 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.

[0014] The present invention, for solving the above-mentioned problem, provides a battery cell comprising: an electrode assembly in which a first electrode and a second electrode and a separator interposed between them are wound around a winding axis; a housing configured to accommodate the electrode assembly through an opening formed on one side, a closed portion formed on the other side, and electrically connected to the second electrode; and a lead assembly configured to cover the opening of the housing, the lead assembly comprising a lead having a first hole, an insulating gasket having a second hole configured to be inserted at least partially into the first hole, and a terminal configured to be inserted at least partially into the second hole.

[0015] The above lead may be provided with a venting portion configured to rupture when the internal pressure of the housing increases above a certain level, thereby discharging gas generated inside the housing.

[0016] The above insulating gasket may be configured to protrude inward in a vertical direction from the lead.

[0017] The insulating gasket may have a first part configured to form the second hole and support the outer surface of the terminal, and a second part configured to protrude radially inward from the first part and support the inner surface of the terminal.

[0018] The above insulating gasket may have a third part configured to support the inner surface of the lead.

[0019] A battery cell according to one embodiment of the present invention may further include a first current collector provided on one side of the electrode assembly and configured to be electrically connected to the first electrode.

[0020] The above insulating gasket may be configured to separate the lead and the first current collector from each other.

[0021] The above first current collector may have a non-bonding portion coupling portion configured to be coupled to the non-bonding portion of the first electrode.

[0022] The above first collector may have an injection hole formed by penetrating the above-mentioned non-removable joint.

[0023] The first current collector may have a terminal coupling portion configured to protrude toward the terminal and be coupled with the terminal.

[0024] The above terminal may have an insertion hole configured to allow at least a portion of the first current collector to be inserted.

[0025] A first welding bead may be formed along the edge of the insertion hole and the edge of the outer surface of the first current collector.

[0026] The lead assembly may be configured to be joined along the perimeter of the side wall member of the housing.

[0027] The above housing may have a second weld bead formed when the second electrode is welded to the outer surface of the above closure.

[0028] In addition, the present invention provides a battery pack characterized by including a plurality of battery cells according to one embodiment of the present invention as described above.

[0029] And, the present invention provides an automobile characterized by including a battery pack according to one embodiment of the present invention.

[0030] Meanwhile, the present invention provides a method for manufacturing a battery cell, comprising the steps of: winding an electrode assembly, in which a first electrode and a second electrode and a separator interposed between them are laminated, around a winding axis; coupling a first current collector configured to be electrically connected to the first electrode to one side of the electrode assembly; inserting the electrode assembly into a housing having an opening formed on one side; injecting an electrolyte through an injection hole of the first current collector; cleaning the residual electrolyte from the terminal coupling portion of the first current collector; seating a lead assembly in the opening of the housing; welding a side wall member of the housing to the outer surface of the lead assembly; and welding a terminal of the lead assembly to the terminal coupling portion of the first current collector.

[0031] In addition, a method for manufacturing a battery cell according to one embodiment of the present invention may further include the step of taping the unoccupied portion of the second electrode; and the step of welding the closed portion formed on the other side of the housing and the unoccupied portion of the second electrode.

[0032] In addition, a method for manufacturing a battery cell according to one embodiment of the present invention may further include a lead assembly step comprising the step of inserting an insulating gasket into a first hole of a lead and the step of inserting a terminal into a second hole of the insulating gasket.

[0033] According to one aspect of the present invention, the process can be simplified by the coupling structure between the housing, lead, terminal, and first current collector of a battery cell, thereby reducing costs and improving productivity.

[0034] Furthermore, according to another aspect of the present invention, the rivet terminals and insulators protruding inwardly from the housing among the components of a conventional battery cell can be removed, thereby increasing the vertical height of the electrode assembly. This allows for an improvement in the energy density of the battery cell.

[0035] In addition, according to another aspect of the present invention, by laser welding the current collector and the terminal and / or housing on the outside of the battery cell, spatter caused by welding may not enter the interior of the battery cell, thereby resolving issues such as damage to the separator of the electrode assembly and reduction in battery capacity and lifespan.

[0036] Furthermore, according to the above aspect of the present invention, since there is no need to insert a welding tip into the inner side of the electrode assembly, the diameter of the center hole of the electrode assembly can be reduced. This allows for an improvement in the energy density of the battery cell.

[0037] In addition to the above, the present invention may have various other effects, which are described in each embodiment, or effects that can be easily inferred by those skilled in the art, etc., will be omitted.

[0038] 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.

[0039] FIG. 1 is an overall perspective view of a battery cell according to one embodiment of the present invention.

[0040] FIG. 2 is a cross-sectional view of a battery cell according to one embodiment of the present invention.

[0041] FIG. 3 is a perspective view of a lead assembly included in a battery cell according to one embodiment of the present invention.

[0042] FIG. 4 is an exploded perspective view of a lead assembly included in a battery cell according to one embodiment of the present invention.

[0043] FIG. 5 is a cross-sectional view of a lead assembly included in a battery cell according to one embodiment of the present invention.

[0044] FIG. 6 is a perspective view of a lead included in a battery cell according to one embodiment of the present invention.

[0045] FIG. 7 is a perspective view of an insulating gasket included in a battery cell according to one embodiment of the present invention.

[0046] FIG. 8 is a perspective view of a terminal included in a battery cell according to one embodiment of the present invention.

[0047] FIG. 9 is a perspective view of a first current collector included in a battery cell according to one embodiment of the present invention.

[0048] FIG. 10 is a partially exploded cross-sectional view of a battery cell according to one embodiment of the present invention.

[0049] FIG. 11 is a cross-sectional view of the upper side of a battery cell according to one embodiment of the present invention.

[0050] FIG. 12 is an upper perspective view of a battery cell according to one embodiment of the present invention.

[0051] FIG. 13 is a cross-sectional view of the lower side of a battery cell according to one embodiment of the present invention.

[0052] FIG. 14 is a bottom side plan view of a battery cell according to one embodiment of the present invention.

[0053] FIG. 15 is a schematic perspective view of a battery pack according to one embodiment of the present invention.

[0054] FIG. 16 is a schematic perspective view of an automobile according to one embodiment of the present invention.

[0055] FIG. 17 is a diagram schematically illustrating the manufacturing process of a battery cell according to one embodiment of the present invention.

[0056] FIG. 18 is a diagram schematically illustrating the manufacturing process of a battery cell according to another embodiment of the present invention.

[0057] FIG. 19 is a diagram schematically illustrating a part of the manufacturing process of a battery cell according to another embodiment of the present invention.

[0058] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, 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.

[0059] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0060] In addition, the present invention includes various embodiments. For each embodiment, redundant descriptions of substantially identical or similar configurations are omitted, and the focus is on the differences.

[0061] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back may be used in the present invention, these terms are used merely for convenience of explanation and may vary depending on the position of the object or the position of the observer, as is obvious to those skilled in the art of the present invention.

[0062] For convenience of explanation, in this specification, the direction following the longitudinal direction of the winding axis of an electrode assembly wound in a jelly-roll form is referred to as the vertical direction. The direction surrounding the winding axis is referred to as the circumferential direction or perimeter direction. The direction approaching or moving away from the winding axis is referred to as the radial direction.

[0063]

[0064] FIG. 1 is an overall perspective view of a battery cell according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a battery cell according to an embodiment of the present invention. FIG. 3 is a perspective view of a lead assembly included in a battery cell according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of a lead assembly included in a battery cell according to an embodiment of the present invention.

[0065] A battery cell (10) according to one embodiment of the present invention may include an electrode assembly (100), a housing (200), and a lead assembly (300). The battery cell (10) may be a secondary battery configured to be capable of charging and discharging. The battery cell (10) may be, for example, a cylindrical battery.

[0066] Preferably, the battery cell (10) may be a cylindrical secondary battery, for example, having a form factor ratio (ratio of height to diameter) greater than approximately 0.4. Preferably, the diameter of the battery cell (10) may be 40 mm to 50 mm, and the height may be 60 mm to 130 mm. The form factor of the battery cell (10) may be, for example, 46110, 4875, 48110, 4880, or 4680.

[0067] The electrode assembly (100) may include a first electrode (110) having a first polarity, a second electrode (120) having a second polarity opposite to the first polarity, and a separator interposed between the first electrode (110) and the second electrode (120).

[0068] The electrode assembly (100) may have a structure in which a laminate comprising a first electrode (110), a second electrode (120), and a separator is wound in one direction (winding direction) around a winding axis.

[0069] The first electrode (110) and / or the second electrode (120) may be configured in the form of a sheet. The first electrode (110) and / or the second electrode (120) may be provided with a current collector made of a metal foil. The metal foil may be appropriately selected according to the polarity of the first electrode (110) and / or the second electrode (120).

[0070] Additionally, the first electrode (110) and / or the second electrode (120) may include an area where an electrode active material is applied to at least a portion. Additionally, a portion of the first electrode (110) and / or the second electrode (120) may be a non-coated portion, which is an area where the electrode active material is not coated. The first electrode (110) and / or the second electrode (120) may each have a non-coated portion. Such a non-coated portion may be provided at the long side end of the winding direction of the first electrode (110) and / or the second electrode (120). Additionally, the non-coated portion may be configured to be exposed to the outside of the separator. At least a portion of the non-coated portion may be used as an electrode tab itself.

[0071] Meanwhile, the first electrode (110) and the second electrode (120) may have opposite polarities. In the embodiment of the present invention, the first electrode (110) is a positive electrode and the second electrode (120) is a negative electrode, and the description will focus on the embodiment in which the first electrode (110) is a positive electrode and the second electrode (120) is a negative electrode.

[0072] The separator may be a porous polymer film, such as a polyolefin-based polymer like ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer, or ethylene / methacrylate copolymer, used alone or in a laminate thereof. As another example, the separator may be a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fibers or polyethylene terephthalate fibers.

[0073] The housing (200) may be configured to accommodate an electrode assembly (100) through an opening formed on one side thereof. The housing (200) may have a closing portion (200b) formed on the opposite side of the opening. In this embodiment, the opening may be provided on the upper side (+Z-axis direction) of the housing (200), and the closing portion (200b) may be provided on the lower side (-Z-axis direction) of the housing (200).

[0074] The housing (200) may be configured in the shape of a cylinder with one side open. More specifically, the housing (200) may have a side wall member (200a). The side wall member (200a) may be configured to surround the outer periphery of the electrode assembly (100). The side wall member (200a) may have an opening on one side. The side wall member (200a) may be configured to extend upward from a closed portion (200b).

[0075] Additionally, the housing (200) may include a conductive metal. The housing (200) may be configured to be electrically connected to the second electrode (120) of the electrode assembly (100). In this case, the housing (200) may function as a second terminal of the battery cell (10).

[0076] The lead assembly (300) may be configured to cover an opening of the housing (200). The lead assembly (300) may be configured to have, for example, a roughly plate shape. The lead assembly (300) may be coupled to the opening of the housing (200). For example, the lead assembly (300) may be seated on the upper edge of the opening of the housing (200).

[0077] Specifically, the lead assembly (300) may be equipped with a lead (310), a terminal (330), and an insulating gasket (320).

[0078] The lead (310) may be configured to have a roughly plate shape. The outer periphery of the lead (310) may be coupled to the upper edge of the opening of the housing (200). Additionally, the lead (310) may include a conductive metal. For example, the lead (310) may be made of SUS material. Accordingly, the lead (310) may be configured to be electrically connected to the second electrode (120).

[0079] Additionally, the lead (310) may have a first hole (H1). The first hole (H1) may be formed by penetrating a part of the lead (310).

[0080] The insulating gasket (320) may be configured to be inserted at least partially into the first hole (H1). Additionally, the insulating gasket (320) may have a second hole (H2). The second hole (H2) may be formed by penetrating a portion of the insulating gasket (320).

[0081] The terminal (330) may be configured to be inserted at least partially into the second hole (H2). Additionally, the terminal (330) may include a conductive metal. For example, the terminal (330) may be aluminum or an aluminum alloy (Al1100). Such a terminal (330) may be configured to be electrically connected to the first electrode (110). Furthermore, the terminal (330) may be configured such that its outer surface is exposed to the outside of the lead (310). In this case, the terminal (330) may function as the first terminal of the battery cell (10).

[0082] An insulating gasket (320) may be interposed between the lead (310) and the terminal (330). The insulating gasket (320) may be made of a material having electrical insulating properties, such as silicone. The insulating gasket (320) may be made of PBT material. PBT material is desirable because it has electrical insulating properties, is inexpensive, and does not react with the electrolyte. Such an insulating gasket (320) may be configured to insulate between the lead (310) and the terminal (330). At the same time, the insulating gasket (320) may be configured to insulate between the lead (310) and the electrode assembly (100). In particular, the insulating gasket (320) may be configured to insulate between the lead (310) and the first electrode (110).

[0083] That is, the terminal (330) having a first polarity and the lead (310) having a second polarity can be maintained in an electrically insulated state by the insulating gasket (320). Accordingly, the terminal (330) can be used as the first terminal, and the structure can be configured so that the remaining area of ​​the lead assembly (300), excluding the area occupied by the terminal (330), can be used as the second terminal.

[0084] Accordingly, the battery cell (10) according to the present invention can connect both the positive and negative electrodes in one direction when electrically connecting a plurality of battery cells (10), thereby simplifying the electrical connection structure. In addition, according to the above embodiment of the present invention, the sealing performance of the housing (200) can be improved as an insulating gasket (320) is provided.

[0085] In addition, according to another aspect of the present invention, by pre-assembling the lead (310), terminal (330), and insulating gasket (320) to manufacture the lead assembly (300) and then joining the lead assembly (300) to the housing (200), the process for manufacturing the battery cell (10) can be simplified, the cost can be reduced, and productivity can be improved.

[0086]

[0087] Hereinafter, each component of the lead assembly (300) will be described in more detail with reference to FIG. 6 to FIG. 8 together with FIG. 5.

[0088] FIG. 5 is a cross-sectional view of a lead assembly included in a battery cell according to one embodiment of the present invention, and FIG. 6 is a perspective view of a lead included in a battery cell according to one embodiment of the present invention.

[0089] Referring to FIG. 5, when assembling the lead assembly (300), an insulating gasket (320) is inserted into the lead (310), and a terminal (330) is inserted into the insulating gasket (320) to form the lead assembly (300). At this time, the insulating gasket (320) is provided between the lead (310) and the terminal (330) to insulate the lead (310) and the terminal (330) from having different polarities.

[0090] More specifically, referring to FIGS. 5 and 6, the lead (310) may have a roughly plate shape. A first hole (H1) may be formed in the center of the lead (310). That is, the lead (310) may be configured in the form of a ring-shaped plate. The lead (310) may be configured to extend widely in the horizontal direction.

[0091] Additionally, the lead (310) may be provided with a venting section (311). The venting section (311) may be configured to break when the internal pressure of the housing (200) increases above a certain level, thereby discharging the gas generated inside the housing (200).

[0092] The venting portion (311) may be a structurally weaker area than the surrounding area so that it can be easily broken when internal pressure is applied. The venting portion (311) may be, for example, an area having a thinner thickness compared to the surrounding area. Referring to FIG. 6, the venting portion (311) may form a roughly circular closed loop. The venting portion (311) may be provided in the form of a groove formed on one side of the lid (310), for example.

[0093] According to the above embodiment of the present invention, when the internal pressure of the housing (200) increases above a reference value during a thermal event, the venting portion (311) is broken, and a part of the lead assembly (300) is separated from the housing (200), thereby allowing high-temperature heat and pressure to be discharged through the opening. For example, based on a 4680 battery cell, the notching depth of the venting portion (311) can be designed so that the venting portion (311) breaks at an internal pressure of about 25 bar or higher.

[0094] Meanwhile, the venting portion (311) may be configured to separate the lid (310) into two regions. For example, the lid (310) may be divided into an inner portion (312) and an outer portion (313) by the venting portion (311). The inner portion (312) and the outer portion (313) may be arranged radially with the venting portion (311) in between. Specifically, the inner portion (312) may be provided radially inward from the venting portion (311). The outer portion (313) may be provided radially outward from the venting portion (311).

[0095] The first hole (H1) may be formed in the inner portion (312). Additionally, the outer portion (313) may be configured to be coupled to the housing (200). For example, the outer portion (313) may be configured to be seated on the side wall member (200a) of the housing (200).

[0096]

[0097] FIG. 7 is a perspective view of an insulating gasket included in a battery cell according to one embodiment of the present invention.

[0098] Again, referring to FIG. 5, the insulating gasket (320) can be configured to be inserted into the first hole (H1) of the lead (310). Additionally, the insulating gasket (320) can be configured to protrude vertically inward from the lead (310). Thus, according to the above embodiment of the present invention, the lead (310) and the electrode assembly (100) can be separated by the insulating gasket (320), thereby allowing the lead (310) and the electrode assembly (100) to be insulated from each other.

[0099] Referring to FIG. 7, the insulating gasket (320) may be configured in the shape of a stepped cylinder. The insulating gasket (320) may be configured in a shape having side walls along the outer edge.

[0100] As a more specific example, the insulating gasket (320) may have a first part (321) and a second part (322). The first part (321) may be configured to form a second hole (H2). That is, the second hole (H2) may be formed by the inner surface of the first part (321).

[0101] The outer surface of the first part (321) may be configured to be exposed to the outside. At this time, the outer surface of the first part (321) may be configured to contact the inner surface of the lead (310). The cross-sectional area of ​​the first part (321) may be configured to correspond approximately to the cross-sectional area of ​​the first hole (H1).

[0102] Additionally, the cross-sectional area of ​​the second hole (H2) can be configured to correspond approximately to the total cross-sectional area of ​​the terminal (330). Accordingly, when the terminal (330) is inserted into the second hole (H2) of the first part (321), the inner surface of the first part (321) can be configured to support the outer surface of the terminal (330).

[0103] This first part (321) can be configured to separate the terminal (330) and the lead (310). By doing so, the lead (310) and the terminal (330) can be insulated from each other.

[0104] The second part (322) may be configured to protrude radially inward from the first part (321). The second part (322) may be configured to be stepped inward from the first part (321). That is, the outer surface of the second part (322) may be provided inwardly from the outer surface of the second part (322). The cross-sectional area of ​​the second part (322) may be configured to correspond approximately to the total cross-sectional area of ​​the terminal (330).

[0105] Additionally, the second part (322) may be configured to accommodate the terminal (330). Accordingly, when the terminal (330) is inserted into the second hole (H2) of the first part (321), the outer surface of the second part (322) may be configured to support the inner surface of the terminal (330).

[0106] Furthermore, the second part (322) may have a third hole (H3). The third hole (H3) may be configured to communicate with the second hole (H2).

[0107] Furthermore, the insulating gasket (320) may have a third part (323). The third part (323) may be configured to extend radially outward from the first part (321) in a stepped manner. The third part (323) may be interposed between the lead (310) and the electrode assembly (100). This third part (323) may be configured to support the inner surface of the lead (310).

[0108] According to the above embodiment of the present invention, the lead (310) and the electrode assembly (100) can be stably separated by the third part (323).

[0109] That is, according to the above embodiment of the present invention, a structure can be provided in which the lead (310) and the electrode assembly (100) are spaced apart by the structure of the insulating gasket (320) described above, so that the lead (310) and the electrode assembly (100) can be insulated from each other.

[0110]

[0111] FIG. 8 is a perspective view of a terminal included in a battery cell according to one embodiment of the present invention.

[0112] Referring to FIG. 5, the terminal (330) may be configured so that at least a portion is inserted into the second hole (H2) of the insulating gasket (320) and seated on the second part (322). At this time, the outer surface of the lead (310), the insulating gasket (320), and the terminal (330) may be formed as a single plane, or the terminal (330) may be configured to protrude outward. Whether the terminal (330) protrudes outward may depend on the height difference between the first part (321) and the second part (322). For example, if the height difference between the first part (321) and the second part (322) is equal to the height of the terminal (330), the terminal (330) may not protrude outward.

[0113] However, as in the embodiment illustrated in FIG. 5, if the height difference between the first part (321) and the second part (322) is smaller than the height of the terminal (330), the outer surface of the terminal (330) may partially protrude outward. In this case, the terminal (330) may be provided at the outermost part of the lead assembly (300).

[0114] According to the above embodiment of the present invention, the terminal (330) is not riveted into the second hole (H2) of the insulating gasket (320) but is seated on the insulating gasket (320) and exposed to the outside of the lead assembly (300). Accordingly, since the riveting process can be eliminated when joining the terminal (330), the battery cell (10) manufacturing process can be simplified, thereby reducing costs and improving productivity.

[0115] Furthermore, according to the above embodiment of the present invention, the portion of the terminal (330) that protrudes inwardly by being riveted into the second hole (H2) of the insulating gasket (320) can be removed. As a result, the vertical height of the electrode assembly (100) can be increased, thereby improving the energy density of the battery cell (10).

[0116] Meanwhile, referring to FIG. 8, the terminal (330) may be configured in a roughly plate shape. In particular, the terminal (330) may be configured in a ring shape. That is, the terminal (330) may have a ring-shaped rim. At this time, the terminal (330) may be provided with an insertion hole (H4).

[0117]

[0118] FIG. 9 is a perspective view of a first current collector included in a battery cell according to an embodiment of the present invention. Also, FIG. 10 is a partially exploded cross-sectional view of a battery cell according to an embodiment of the present invention, and FIG. 11 is a cross-sectional view of the upper side of a battery cell according to an embodiment of the present invention.

[0119] Meanwhile, referring to FIG. 9, a battery cell (10) according to one embodiment of the present invention may further include a first current collector (400). The first current collector (400) may be provided on one side of the electrode assembly (100). For example, the first current collector (400) may be provided on the upper side of the electrode assembly (100). The first current collector (400) may be configured to be electrically connected to the first electrode (110).

[0120] The first current collector (400) may be configured to electrically connect the first electrode (110) and the terminal (330). The first current collector (400) may be coupled to the non-transferable portion of the first electrode (110) provided in the electrode assembly (100). Additionally, the first current collector (400) may be coupled to the terminal (330).

[0121] Referring to FIG. 9, the structure of the first current collector (400) is described in detail. At least a portion of the first current collector (400) may be configured to be inserted into the insertion hole (H4) and coupled with the terminal (330).

[0122] More specifically, the first current collector (400) may be provided with a non-removable part coupling part (410) and a terminal coupling part (420).

[0123] The non-bonding portion (410) may be configured to face one side of the electrode assembly (100). The non-bonding portion (410) may be configured in a roughly plate shape. The non-bonding portion (410) may be configured to be coupled to the non-bonding portion of the first electrode (110). The non-bonding portion (410) may be extended radially to have a sufficient coupling area with the non-bonding portion of the first electrode (110).

[0124] The terminal coupling portion (420) may be configured such that a portion of the non-coupling portion (410) protrudes outward in a vertical direction. The terminal coupling portion (420) may be located, for example, at approximately the center of the first current collector (400). The terminal coupling portion (420) may be positioned at a location corresponding to a center hole formed in the core portion of the electrode assembly (100). Additionally, the terminal coupling portion (420) may be configured to protrude toward the terminal (330). The terminal coupling portion (420) may be configured in a cylindrical shape. The upper surface of the terminal coupling portion (420) may provide a flat surface.

[0125] In particular, referring to FIGS. 10 and 11, the terminal coupling portion (420) can be configured to be inserted into the insertion hole (H4) of the terminal (330). That is, the terminal coupling portion (420) can be configured to pass through the third hole (H3) and the insertion hole (H4) in sequence so that its outer surface is exposed to the outside.

[0126] The cross-sectional area of ​​the terminal coupling portion (420) can be configured to correspond approximately to the cross-sectional area of ​​the insertion hole (H4) of the terminal (330). Thus, the outer surface of the terminal coupling portion (420) can be configured to be supported by the inner surface of the terminal (330).

[0127] The terminal coupling portion (420) can be configured to be coupled with the terminal (330). For example, the terminal coupling portion (420) can be coupled with the terminal (330) by welding. Accordingly, the terminal (330) can have a first polarity.

[0128] According to the above embodiment, even if the terminal (330) is not directly coupled to the first electrode (110), it can be electrically connected to the electrode assembly (100) through the first current collector (400). As a result, the portion of the terminal (330) that is riveted and protrudes inward can be eliminated. Accordingly, the vertical height of the electrode assembly (100) can be increased, thereby improving the energy density of the battery cell (10).

[0129] Meanwhile, the first collector (400) may be provided with a liquid injection hole (I). The liquid injection hole (I) may be formed in the non-removable part coupling portion (410). The liquid injection hole (I) may be configured in the form of a hole formed by penetrating the non-removable part coupling portion (410).

[0130] These injection holes (I) can be configured to allow electrolyte to be injected into the electrode assembly (100). After attaching the first current collector (400) to the electrode assembly (100) and inserting it into the housing (200), and before attaching the lead assembly (300) to the housing (200), electrolyte can be injected through the injection holes (I) of the first current collector (400). The electrolyte can pass through the injection holes (I) and move into the interior of the electrode assembly (100).

[0131] Multiple injection holes (I) may be provided. Accordingly, multiple non-removable joints (410) may also be provided. The injection holes (I) and non-removable joints (410) may be arranged to intersect each other along the circumferential direction. The number of non-removable joints (410) and / or injection holes (I) may be determined by considering the resistance level required for the battery cell (10), the opening ratio required for the first current collector (400), etc. The injection holes (I) and non-removable joints (410) may be approximately fan-shaped.

[0132]

[0133] Meanwhile, referring to FIG. 11, the insulating gasket (320) may be configured to separate the lead (310) and the first current collector (400) from each other. In particular, the third part (323) may be configured to separate the lead (310) and the first current collector (400) from each other. That is, the vertical outer surface of the third part (323) may be configured to contact the lead (310), and the vertical inner surface of the third part (323) may be configured to contact the first current collector (400).

[0134] According to the above embodiment of the present invention, due to the structure of the insulating gasket (320), the leads (310) having different polarities and the first current collector (400) can be electrically insulated from each other even without a separate insulator. As a result, the insulator can be removed, thereby increasing the vertical height of the electrode assembly (100). This allows for an improvement in the energy density of the battery cell (10). Additionally, as the component is removed, costs can be reduced and productivity can be improved.

[0135]

[0136] FIG. 12 is an upper perspective view of a battery cell according to one embodiment of the present invention.

[0137] Meanwhile, the terminal (330) can be joined to the first current collector (400) by laser welding. In particular, the terminal joining portion (420) of the terminal (330) and the first current collector (400) can be joined by laser welding. Accordingly, the terminal (330) may have a first welding bead (W1). The first welding bead (W1) may be formed when the terminal (330) and the first current collector (400) are joined. The first welding bead (W1) may be a welding bead formed by laser welding, etc.

[0138] In particular, in one embodiment of the present invention, a laser can be irradiated from the outside of the terminal (330) by means of the structure of the lead assembly (300) and the first current collector (400) so that the terminal (330) and the first current collector (400) can be combined. Accordingly, as in the embodiment shown in FIG. 12, the first welding bead (W1) can be provided on the outside of the terminal (330).

[0139] The first weld bead (W1) can be formed along the edge of the insertion hole (H4) and the edge of the outer surface of the first current collector (400). Specifically, the first weld bead (W1) can be formed along the edge of the outer surface of the terminal coupling part (420).

[0140] For example, as in the embodiment illustrated in FIG. 12, the terminal coupling portion (420) of the first current collector (400) is provided in a ring shape, and the first weld bead (W1) can also be formed in a ring shape. However, the shape of the first weld bead (W1) is merely an example, and it is obvious that it can be formed in other shapes as well.

[0141] According to the above embodiment of the present invention, since the terminal (330) and the first current collector (400) can be laser welded on the outside of the battery cell (10), even if spatter is generated due to welding, it may not enter the interior of the battery cell (10), thereby minimizing damage to the separator of the electrode assembly (100). As a result, the lifespan of the battery cell (10) can be increased.

[0142] In addition, according to the above embodiment of the present invention, when welding the terminal (330), the process of inserting an ultrasonic welding rod into the center hole of the electrode assembly (100) can be omitted, so the diameter of the center hole of the electrode assembly (100) can be reduced. As a result, the capacity of the battery cell (10) can be increased and the energy density of the battery cell (10) can be improved.

[0143] The upper surface of the terminal coupling portion (420), the first weld bead (W1), and the terminal (330) may be further processed to provide a flat surface or to provide a flat surface, thereby providing a sufficient contact area with electrical connection components such as a bus bar.

[0144] Meanwhile, the lead assembly (300) may be configured such that its inner surface rests on the upper edge of the side wall member (200a) of the housing (200). At this time, the lead assembly (300) may be configured to be joined along the perimeter of the side wall member (200a) of the housing (200). In other words, the contact point between the edge of the outer surface of the housing (200) and the edge of the inner surface of the lead assembly (300) may be joined. For example, the outer surface of the housing (200) and the inner surface of the edge of the lead assembly (300) may be joined by welding. In this case, the weld (part A in FIG. 12) may be located along the perimeter of the outer surface of the upper edge of the housing (200).

[0145] Meanwhile, the housing (200) and the lead assembly (300) can be joined by a joining method other than welding, and the joining method is not limited to this.

[0146]

[0147] FIG. 13 is a cross-sectional view of the lower side of a battery cell according to one embodiment of the present invention, and FIG. 14 is a plan view of the lower side of a battery cell according to one embodiment of the present invention.

[0148] Meanwhile, according to one embodiment of the present invention, the unbonded portions of the second electrode (120) may be configured to be bonded together with tape or the like. In particular, when the unbonded portion of the second electrode (120) has a plurality of segments, the plurality of segments may be wrapped by tape to form a single shape.

[0149] In this case, the non-existent portion of the second electrode (120) can be directly connected to the housing (200). For example, the non-existent portion of the second electrode (120) can be welded to the closed portion (200b) of the housing (200). Accordingly, the housing (200) can have a second polarity.

[0150] The closed portion (200b) of the housing (200) can be joined to the unoccupied portion of the second electrode (120) by laser welding. Accordingly, the closed portion (200b) of the housing (200) may have a second weld bead (W2). The second weld bead (W2) may be formed when the housing (200) and the second electrode (120) are joined. The second weld bead (W2) may be a weld bead formed by laser welding, etc.

[0151] Meanwhile, after taping the unoccupied portion of the second electrode (120) of the electrode assembly (100), the electrode assembly (100) can be inserted through the opening of the housing (200) to join the unoccupied portion of the second electrode (120) and the closed portion (200b) of the housing (200). At this time, in one embodiment of the present invention, a laser can be irradiated from the outside of the housing (200) to join the housing (200) and the unoccupied portion of the second electrode (120). Accordingly, as in the embodiment shown in FIGS. 13 and 14, the second weld bead (W2) can be provided on the outer surface of the closed portion (200b) of the housing (200).

[0152] For example, as in the embodiment shown in FIG. 14, the second weld bead (W2) may be formed along the radial direction. However, the shape of this second weld bead (W2) is merely an example, and it is obvious that it may be formed in other shapes as well.

[0153] In this embodiment, a current collector does not need to be used on the non-current side of the second electrode (120). This allows for cost reduction in terms of components and simplifies the process.

[0154] Meanwhile, unlike one embodiment of the present invention, the battery cell (10) may further include a second current collector. The second current collector may be provided on the other side of the electrode assembly (100). For example, the second current collector may be provided on the lower side of the electrode assembly (100). The second current collector may be coupled to the non-contained portion of the second electrode (120). In this case, the second current collector may be welded to the closed portion (200b) of the housing (200).

[0155]

[0156] FIG. 15 is a schematic perspective view of a battery pack according to one embodiment of the present invention.

[0157] A battery pack (1) according to one embodiment of the present invention may include a plurality of batteries of the present invention as described above. A battery cell (10) may be accommodated within a pack housing (2). The battery pack (1) may include components for electrical connection of the battery cells (10) and / or a battery management system (BMS) configured to control the charging and discharging of the battery cells (10).

[0158] In each battery cell (10), the positive terminal and the negative terminal can be arranged so that they are both positioned on the upper side. Therefore, when electrically connecting multiple battery cells (10), the electrical connection structure can be simplified because both the positive and negative terminals can be connected in one direction.

[0159] Through this, the number of battery cells (10) that can be installed in the same space can be increased to improve energy density, and electrical wiring work can be easily carried out. Therefore, space efficiency is good and electrical wiring efficiency is high, resulting in significant work improvement effects during the assembly process of the electric vehicle and during the assembly and maintenance of the battery pack (1).

[0160] In addition, each battery cell (10) may have a higher energy density than conventional ones, as previously explained. A battery pack (1) with such increased energy density can store the same amount of energy while reducing its volume and load. Therefore, if a battery pack (1) with such battery cells (10) is installed in a vehicle, such as a car (V) that uses electricity as an energy source as shown in FIG. 16, the vehicle's mileage relative to energy can be further increased.

[0161]

[0162] FIG. 16 is a schematic perspective view of an automobile according to one embodiment of the present invention.

[0163] A vehicle (V) according to one embodiment of the present invention may include at least one battery pack (1). The vehicle (V) may be configured to operate by receiving power from the battery pack (1). The vehicle (V) may be, for example, a hybrid vehicle (HEV) or an electric vehicle (EV).

[0164]

[0165] Next, a method for manufacturing a battery cell according to an embodiment of the present invention will be described. In describing the method for manufacturing a battery cell of the present invention, reference will be made in whole to FIGS. 1 to 14 and FIGS. 17 to 19 of the present invention.

[0166] FIG. 17 is a diagram schematically illustrating the manufacturing process of a battery cell according to one embodiment of the present invention.

[0167] Referring to FIG. 17, a method for manufacturing a battery cell according to one embodiment of the present invention may include an electrode assembly winding step (S1), a first current collector coupling step (S2), an electrode assembly insertion step (S3), an electrolyte injection step (S4), a laser cleaning step (S5), a lead assembly seating step (S6), a housing and lead assembly coupling step (S7), and a terminal and first current collector welding step (S8).

[0168] The electrode assembly winding step (S1) may be a step of winding an electrode assembly (100) in which a first electrode (110), a second electrode (120), and a separator interposed between them are laminated, around a winding axis. Accordingly, the electrode assembly (100) may have a structure in which a laminate comprising a first electrode (110), a second electrode (120), and a separator is wound in one direction (winding direction) around a winding axis.

[0169] The first current collector coupling step (S2) may be a step of coupling a first current collector (400) configured to be electrically connected to the first electrode (110) on one side of the electrode assembly (100). The first current collector (400) may be welded to the non-coupling portion of the first electrode (110).

[0170] The electrode assembly insertion step (S3) may be a step of inserting the electrode assembly (100) into a housing (200) having an opening formed on one side. The electrode assembly (100) may be inserted into the interior of the housing (200) through the opening of the housing (200). Meanwhile, since the housing (200) does not have rivet terminals unlike conventional methods, the process of forming a through hole in the housing (200), the process of inserting a terminal into the through hole, and the process of riveting the terminal to join it to the housing (200) are not required. This simplifies the process compared to conventional cylindrical battery cell manufacturing methods, thereby enabling cost reduction in terms of the process.

[0171] The electrolyte injection step (S4) may be a step of injecting the electrolyte through the injection hole (I) of the first current collector (400). The electrolyte may move into the interior of the electrode assembly (100) through the injection hole (I).

[0172] The laser cleaning step (S5) may be a step for cleaning the residual electrolyte in the terminal connection portion (420) of the first current collector (400). Since welding between the terminal connection portion (420) of the first current collector (400) and the terminal (330) must proceed later, the laser cleaning step (S5) is a process for removing the residual electrolyte generated in the electrolyte injection step (S4). Since welding is subsequently performed between the lead assembly (300) and the side wall member (200a) of the housing (200), it is desirable to remove any residual electrolyte in the side wall member (200a) of the housing (200). Since residual electrolyte vaporizes during laser welding and forms bubbles in the weld area, causing problems, the welding quality can be ensured by performing the laser cleaning step (S5) as in the embodiment of the present invention.

[0173] The lead assembly seating step (S6) may be a step of seating the lead assembly (300) in the opening of the housing (200). The lead assembly (300) may be configured to cover the opening of the housing (200). For example, the lead assembly (300) may be seated on the upper edge of the opening of the housing (200).

[0174] Additionally, in the lead assembly seating step (S6), the terminal coupling portion (420) of the first current collector (400) can be inserted into the insertion hole (H4) of the terminal (330).

[0175] The housing and lead assembly joining step (S7) may be a step of welding the side wall member (200a) of the housing (200) and the outer surface of the lead assembly (300). For example, the outer surface of the housing (200) and the inner surface of the edge of the lead assembly (300) may be joined by welding. In this case, the weld (part A in FIG. 12) may be located along the perimeter of the outer surface of the top edge of the housing (200).

[0176] The terminal and first current collector welding step (S8) may be a step of welding the terminal (330) of the lead assembly (300) and the first current collector (400). The terminal and first current collector welding step (S8) may include a process of performing laser welding to join the terminal (330) to the first current collector (400) from the outside of the terminal (330). In particular, the terminal and first current collector welding step (S8) may be performed along the edge of the insertion hole (H4) of the terminal (330) and the edge of the outer surface of the terminal coupling part (420). The result of such laser welding is the same as the embodiment illustrated in FIG. 12 described above.

[0177] According to the above embodiment of the present invention, since the terminal (330) and the first current collector (400) can be laser welded on the outside of the battery cell (10), even if spatter is generated due to welding, it may not enter the interior of the battery cell (10), thereby minimizing damage to the separator of the electrode assembly (100). As a result, the lifespan of the battery cell (10) can be increased.

[0178] In addition, according to the above embodiment of the present invention, when welding the terminal (330), the process of inserting an ultrasonic welding rod into the center hole of the electrode assembly (100) can be omitted, so the diameter of the center hole of the electrode assembly (100) can be reduced. As a result, the capacity of the battery cell (10) can be increased and the energy density of the battery cell (10) can be improved.

[0179] Meanwhile, the manufacturing process of the battery cell (10) described above may proceed in sequence, and additional processes may be performed between each process.

[0180]

[0181] FIG. 18 is a diagram schematically illustrating the manufacturing process of a battery cell according to one embodiment of the present invention.

[0182] Additionally, referring to FIG. 18, a method for manufacturing a battery cell according to another embodiment of the present invention may further include a second non-removable part taping step (S9) and a housing and a second non-removable part welding step (S10) in the method for manufacturing a battery cell described with reference to FIG. 17.

[0183] The second non-border taping step (S9) may be a step of taping the non-border portion of the second electrode (120). The second non-border taping step (S9) may include a process of bonding the non-border portions of the second electrode (120) to each other using tape or the like. In particular, if the non-border portion of the second electrode (120) has a plurality of segments, the plurality of segments may be wrapped by tape to form a single shape. For example, the second non-border taping step (S9) may be performed before the electrode assembly insertion step (S3).

[0184] The housing and second non-bonded part welding step (S10) may be a step of welding the non-bonded part of the second electrode (120) to the closed part (200b) formed on the other side of the housing (200). The housing and second non-bonded part welding step (S10) may include a process of performing laser welding to join the housing (200) and the non-bonded part of the second electrode (120) on the outside of the closed part (200b) of the housing. The result of such laser welding is the same as the embodiment shown in FIGS. 13 and 14 described above.

[0185] For example, the welding step (S10) of the housing and the second non-bonded portion can be performed after the electrode assembly insertion step (S3). Additionally, preferably, the welding step (S10) of the housing and the second non-bonded portion can be performed before the electrolyte injection step (S4). Thus, since the components inside the housing (200) can be fixed, the electrolyte can be smoothly impregnated into the electrode assembly (100) when the electrolyte is injected.

[0186] According to this manufacturing method, compared to the conventional battery cell manufacturing method, the insulator insertion step and the beading and crimping steps of the housing (200) are omitted, and cost reduction is achieved in terms of process through process simplification. In addition, since an insulator component is not required, there is also a cost reduction effect due to the reduction in the number of parts.

[0187] Furthermore, since the size of the electrode assembly (100) inside the housing (200) can be increased by removing the insulator, the energy density can be improved. For example, based on a 4680 battery cell, in the battery cell (10) according to the embodiment of the present invention with the insulator removed, the volume of the electrode assembly (100) is 1,901.73 mm 3 It can be increased.

[0188]

[0189] FIG. 19 is a diagram schematically illustrating a part of the manufacturing process of a battery cell according to one embodiment of the present invention.

[0190] Meanwhile, referring to FIG. 19, a method for manufacturing a battery cell according to one embodiment of the present invention may further include a lead assembly assembly step (S11). The lead assembly assembly step (S11) may be performed before the lead assembly seating step (S6).

[0191] Additionally, the lead assembly assembly step (S11) may include a step of joining the lead and the insulating gasket (P1) and a step of joining the insulating gasket and the terminal (P2).

[0192] The lead and insulating gasket joining step (P1) may be a step of inserting an insulating gasket (320) into the first hole (H1) of the lead (310). The shape of the lead (310) and the insulating gasket (320) is the same as the embodiment shown in FIGS. 6 and 7.

[0193] Next, the step of joining the insulating gasket and the terminal (P2) may be a step of inserting the terminal (330) into the second hole of the insulating gasket (320). The shape of the terminal (330) is the same as the embodiment shown in FIG. 8.

[0194] The assembly result of such a lead assembly (300) is the same as the embodiment shown in FIG. 5 described above.

[0195] According to the above embodiment of the present invention, the terminal (330) having a first polarity and the lead (310) having a second polarity can be maintained in an electrically insulated state. Accordingly, the terminal (330) can be used as the first terminal, and the structure can be configured so that the remaining area of ​​the lead assembly (300), excluding the area occupied by the terminal (330), can be used as the second terminal.

[0196] Accordingly, the battery cell (10) according to the present invention can connect both the positive and negative electrodes in one direction when electrically connecting a plurality of battery cells (10), thereby simplifying the electrical connection structure. In addition, according to the above embodiment of the present invention, the sealing performance of the housing (200) can be improved as an insulating gasket (320) is provided.

[0197] In addition, according to the above embodiment of the present invention, the terminal (330) is not riveted into the second hole (H2) of the insulating gasket (320) but is seated on the insulating gasket (320) and exposed to the outside of the lead assembly (300). Accordingly, since the riveting process can be eliminated when joining the terminal (330), the battery cell (10) manufacturing process can be simplified, thereby reducing costs and improving productivity.

[0198] Furthermore, according to the above embodiment of the present invention, the portion of the terminal (330) that protrudes inwardly by being riveted into the second hole (H2) of the insulating gasket (320) can be removed. As a result, the vertical height of the electrode assembly (100) can be increased, thereby improving the energy density of the battery cell (10).

[0199] In addition, according to another aspect of the present invention, the lead (310), terminal (330), and insulating gasket (320) are pre-assembled to manufacture a lead assembly (300), and then the lead assembly (300) is coupled to a housing (200), thereby simplifying the process during the manufacture of the battery cell (10), reducing costs, and improving productivity.

[0200]

[0201] Although the present invention has been described above by 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 described below by those skilled in the art to which the present invention belongs.

Claims

1. An electrode assembly comprising a first electrode and a second electrode and a separator interposed between them, wound around a winding axis; A housing configured to accommodate the electrode assembly through an opening formed on one side, have a closed portion formed on the other side, and be electrically connected to the second electrode; and A battery cell characterized by comprising a lead assembly configured to cover the opening of the housing, the lead having a first hole, an insulating gasket having a second hole configured to be inserted at least partially into the first hole, and a terminal configured to be inserted at least partially into the second hole.

2. In Paragraph 1, The above lead is A battery cell characterized by having a venting section configured to rupture when the internal pressure of the housing increases above a certain level, thereby discharging gas generated inside the housing.

3. In Paragraph 1, A battery cell characterized in that the insulating gasket is configured to protrude inwardly in a vertical direction relative to the lead.

4. In Paragraph 1, The above insulation gasket is A first part configured to form the second hole and support the outer surface of the terminal, and A battery cell characterized by having a second part configured to protrude radially inward from the first part and support the inner surface of the terminal.

5. In Paragraph 1, The above insulation gasket is A battery cell characterized by having a third part configured to support the inner surface of the above lead.

6. In Paragraph 1, A battery cell characterized by further including a first current collector provided on one side of the electrode assembly and configured to be electrically connected to the first electrode.

7. In Paragraph 6, A battery cell characterized in that the insulating gasket is configured to separate the lead and the first current collector from each other.

8. In Paragraph 6, The above first current collector is A battery cell characterized by having a non-bonded portion coupling portion configured to be coupled to a non-bonded portion of the first electrode.

9. In Paragraph 8, The above first current collector is A battery cell characterized by having a liquid injection hole formed by penetrating the above-mentioned non-removable joint portion.

10. In Paragraph 6, A battery cell characterized in that the first current collector has a terminal coupling portion configured to protrude toward the terminal and be coupled with the terminal.

11. In Paragraph 6, The above terminal A battery cell characterized by having an insertion hole configured to allow at least a portion of the first current collector to be inserted.

12. In Paragraph 11, A battery cell characterized by having a first welding bead formed along the edge of the insertion hole and the edge of the outer surface of the first current collector.

13. In Paragraph 1, A battery cell characterized in that the lead assembly is configured to be joined along the perimeter of the side wall member of the housing.

14. In Paragraph 1, The above housing is A battery cell characterized by having a second weld bead formed when the second electrode is welded to the outer surface of the above-mentioned closure.

15. A battery pack characterized by including a plurality of battery cells according to any one of claims 1 to 14.

16. An automobile characterized by including a battery pack according to paragraph 15.

17. A step of winding an electrode assembly, in which a first electrode and a second electrode and a separator interposed between them are laminated, around a winding axis; A step of coupling a first current collector configured to be electrically connected to the first electrode to one side of the electrode assembly; A step of inserting the electrode assembly into a housing having an opening formed on one side; A step of injecting an electrolyte through the injection hole of the first current collector; A step of cleaning the residual electrolyte at the terminal connection portion of the first current collector; A step of seating a lead assembly in the opening of the housing; A step of welding the side wall member of the housing and the outer surface of the lead assembly; and A method for manufacturing a battery cell characterized by including the step of welding the terminal of the lead assembly and the terminal joint of the first current collector.

18. In Paragraph 17, A step of taping the unused portion of the second electrode; and A method for manufacturing a battery cell, further comprising the step of welding a closed portion formed on the other side of the housing and a non-closed portion of the second electrode.

19. In Paragraph 17, A method for manufacturing a battery cell, further comprising a lead assembly step including the step of inserting an insulating gasket into a first hole of a lead and the step of inserting a terminal into a second hole of the insulating gasket.