Battery cell and manufacturing method therefor

Abstract

A battery cell and a manufacturing method therefor are disclosed. The battery cell comprises: a can housing in which an electrode assembly is accommodated, and which has a terminal hole; a current collector plate disposed at an axial end of the electrode assembly; an insulator interposed between the can housing and the current collector plate; an electrode terminal unit inserted into the terminal hole; and a terminal bolt unit fastened to the current collector plate through the electrode terminal unit so as to be secured by the current collector plate.

Description

Battery cell and manufacturing method thereof

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0081413, dated June 21, 2024, and Korean Patent Application No. 10-2025-0061340, dated May 12, 2025, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery cell and a method for manufacturing the same, which can prevent damage to a separator due to welding heat by omitting welding of an electrode terminal portion and a current collector plate, can reinforce the fastening force and structural rigidity of an electrode terminal portion to a can housing, can expand the current path of an electrode terminal portion and a current collector plate, and can inject an electrolyte through the electrode terminal portion.

[0003] Typically, a cylindrical battery cell comprises a can housing and an electrode assembly. The can housing can be manufactured by deep drawing a metal sheet to form a circular bottom portion and a circular tubular side wall member connected thereto. The electrode assembly is housed within the can housing.

[0004] A typical cylindrical battery cell may have a can housing electrically connected to a first electrode of an electrode assembly, and a cap assembly closing an opening of the can housing may be electrically connected to a second electrode of the electrode assembly. Accordingly, the can housing may form a first electrode, and the cap assembly may form a positive electrode.

[0005] Recently, a cylindrical battery cell with a new structure has been developed. In the battery cell, an electrode terminal portion is installed in a terminal hole at the bottom of a can housing, and the opening of the can housing is closed with a cap. An insulating gasket is interposed between the electrode terminal portion and the can housing. A first collector plate and a second collector plate, which are respectively connected to the first and second electrodes of the electrode assembly, are welded to both axial ends of the electrode assembly. The first collector plate may be welded to the cap, and the second collector plate may be welded to the electrode terminal portion.

[0006] However, the high temperature energy and spatter generated during the welding process of the current collector plate to the electrode terminal and cap of the battery cell can tear or damage the separator of the electrode assembly. If the separator is torn or damaged, the positive and negative electrodes may come into electrical contact, causing a short circuit, which can lead to a fire.

[0007] Additionally, the collector plate can be resistance welded, ultrasonic welded, or laser welded. In this case, welding defects may occur due to poor flatness or appearance of the collector plate. If a defect occurs in the welded area of ​​the collector plate, the tensile strength of the welded area will be significantly reduced, potentially causing low voltage generation.

[0008] The above battery cell is provided with an insulator for electrical insulation between the can housing and the current collector plate. The insulator is interposed between the bottom of the can housing and the current collector plate. Since the insulator is formed in the form of a flat plate with a predetermined thickness, and the current collector plate is also formed in the form of a flat plate, the current collector plate must be strongly pressed with an ultrasonic welding horn to ensure that the current collector plate adheres closely to the electrode terminal. During this process, the current collector plate may be deformed.

[0009] Accordingly, the current collector plate may become excessively deformed, and the welded area may become pre-tensioned, which can negatively affect the weld strength. Furthermore, vibrations and shocks generated during battery cell use can affect the welded area, potentially causing it to detach or crack the current collector plate. In particular, repeated and continuous tension and stress can cause fatigue failure. If this occurs, the electrical connection between the electrode terminal and the current collector plate may be damaged, potentially leading to a loss of battery cell functionality.

[0010] The background technology of the present invention is disclosed in Korean Patent Publication No. 2022-0113654 (published on August 16, 2022, title: Fixing structure of electrode terminal and battery, battery pack, and automobile including the same).

[0011] The present invention has been devised to solve the above-described problems, and aims to provide a battery cell and a manufacturing method thereof that can electrically connect an electrode terminal portion and a current collector plate without welding them, thereby omitting the welding process thereof.

[0012] The purpose of the present invention is to provide a battery cell and a method for manufacturing the same, which can prevent damage to a separator of an electrode assembly by not generating spatter or heat due to welding.

[0013] The purpose of the present invention is to provide a battery cell and a method for manufacturing the same, which can significantly reduce the risk of short circuit or fire.

[0014] The purpose of the present invention is to provide a battery cell and a manufacturing method thereof in which the bonding strength and structural rigidity of an electrode terminal portion can be significantly increased.

[0015] The purpose of the present invention is to provide a battery cell and a method for manufacturing the same, which can prevent an electrode terminal from being ejected or detached from a terminal hole of a can housing when a thermal runaway of the battery cell occurs.

[0016] The purpose of the present invention is to provide a battery cell and a manufacturing method thereof that can stably maintain the bonding state of an electrode terminal and a current collector plate even under vibration or impact.

[0017] The technical objectives of the present invention are not limited to the purposes mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0018] The present invention can be applied to a battery cell having a structure that electrically connects an electrode terminal portion and a current collector plate.

[0019] The above battery cell includes an electrode assembly and a can housing in which the electrode assembly is built.

[0020] A terminal hole is provided in the above can housing.

[0021] The terminal hole may be formed in the bottom of the can housing. Preferably, the terminal hole may be formed in a circular shape in the center of the can housing.

[0022] A current collector plate is installed in the above electrode assembly. The current collector plate can be electrically connected to a first electrode of the electrode assembly.

[0023] The above current collector plate is arranged at the axial end of the electrode assembly.

[0024] An electrode terminal portion is inserted and installed into the terminal hole. The electrode terminal portion can pass through the terminal hole.

[0025] In the above electrode terminal portion, a terminal bolt portion that penetrates the electrode terminal portion and is fastened to the current collector plate is installed.

[0026] The above terminal bolt portion is at least fixed to the above current collector plate.

[0027] The above terminal bolt portion can press the current collector plate in the axial direction toward the electrode terminal portion.

[0028] The above electrode terminal portion may include a terminal head portion that presses the periphery of the terminal hole, and a terminal insertion portion that extends from the terminal head portion and is inserted into the terminal hole.

[0029] The terminal head portion may be formed to extend radially outward from the axial outer end of the terminal insertion portion.

[0030] The above terminal bolt portion can be fastened to the current collector plate by penetrating the terminal insertion portion.

[0031] The above electrode terminal portion may further include a plastic deformation portion that extends from the terminal insertion portion and is bent to press against the terminal head portion and the peripheral portion of the terminal hole.

[0032] The above plastic deformation portion may include a plastic deformation rib arranged along the circumferential direction at the end of the terminal insertion portion.

[0033] The above plastic deformation ribs may extend continuously or intermittently along the circumferential direction. For example, the above plastic deformation ribs may be provided in multiple numbers and arranged so as to be arranged along the circumferential direction, or a single plastic deformation rib in the shape of a circular tube may be arranged so as to extend in the circumferential direction.

[0034] The terminal insertion portion may be provided with a bolt hole portion into which a bolt fastening portion of the terminal bolt portion is inserted.

[0035] In some examples, the inner diameter of the bolt hole portion may be set smaller than the outer diameter of the bolt fastening portion so that the periphery of the bolt hole portion is plastically deformed as the bolt fastening portion is inserted.

[0036] In some examples, the diameter of the bolt hole portion may be set to correspond to or be larger than the diameter of the terminal bolt portion.

[0037] The terminal head portion may be provided with a receiving groove portion for receiving the bolt head portion of the terminal bolt portion.

[0038] The above-mentioned current collector plate may be provided with a restraining tab portion to which the terminal bolt portion is screw-connected.

[0039] In some examples, the collector plate is formed in a flat shape, and the height of the restraining tab portion may correspond to the thickness of the collector plate or be thinner than that.

[0040] In some examples, the collector plate may include a flat portion formed in a flat shape and a protrusion formed to protrude axially from the flat portion at a position corresponding to the terminal hole, and the restraining tab portion may be formed to penetrate the protrusion.

[0041] In some examples, the battery cell may further include a sealing member installed between the bolt head portion of the terminal bolt portion and the bottom surface of the receiving groove portion of the terminal head portion.

[0042] In some examples, the battery cell may further include a gasket interposed between the inner surface of the terminal hole and the outer surface of the electrode terminal portion to electrically insulate and seal the electrode terminal portion and the can housing.

[0043] The present invention provides a method for manufacturing a battery cell having the structure described above. The method for manufacturing the battery cell may include the steps of: preparing a can housing having a terminal hole; inserting a gasket into the terminal hole in an axial direction; inserting an electrode terminal portion into the terminal hole from an axial outer side of the terminal hole; and bending a plastic deformation portion of the electrode terminal portion radially outward to bind the electrode terminal portion to the terminal hole.

[0044] The method for manufacturing the above battery cell includes the step of inserting an electrode assembly with a collector plate welded thereto into the inside of the can housing, and corresponding the restraining tab portion of the collector plate to the bolt hole portion of the electrode terminal portion.

[0045] The method for manufacturing the above battery cell includes a fastening step in which a terminal bolt portion passes through the bolt hole portion and is fastened to the restraining tab portion.

[0046] The method for manufacturing the above battery cell may further include a step of providing a terminal bolt portion having a bolt fastening portion having a diameter larger than the diameter of the bolt hole portion so that the peripheral portion of the bolt hole portion is plastically deformed as the bolt fastening portion is inserted in the fastening step.

[0047] The method for manufacturing the above battery cell may further include a step of providing a current collector plate having a flat plate formed in a flat shape and a protrusion formed to protrude from the flat plate at a position corresponding to the terminal hole, in order to expand an axial section in which the restraining tab portion is fastened to the current collector plate, and having the restraining tab portion formed on the protrusion portion.

[0048] According to the present invention, since the terminal bolt portion is fastened to the collector plate, the electrode terminal portion and the collector plate do not need to be welded, so the welding process can be omitted.

[0049] According to the present invention, since the welding process of the electrode terminal portion and the current collector plate can be omitted, damage to the separator in the electrode assembly can be prevented, and the risk of short circuit or thermal runaway between electrodes can be significantly reduced.

[0050] According to the present invention, since the terminal bolt portion is screwed to the current collector plate, the current collector plate does not need to be brought into strong axial contact with the electrode terminal portion for welding. Accordingly, pre-tensioning of the current collector plate can be prevented.

[0051] According to the present invention, since the terminal bolt portion is screw-connected to the restraining tab portion provided on the protruding portion of the current collector plate, the bonding force and structural rigidity of the electrode terminal portion and the current collector plate can be significantly increased.

[0052] According to the present invention, since the bonding strength and structural rigidity of the electrode terminal portion are significantly increased, the electrode terminal portion can be prevented from being blown out or detached from the terminal hole of the can housing when the battery pack experiences thermal runaway.

[0053] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0054] Figure 1 is an exploded perspective view schematically illustrating a state in which the electrodes and separator constituting the battery cell according to the present invention are separated.

[0055] Fig. 2 is a perspective view schematically illustrating the stacking state of the electrode and separator of Fig. 1.

[0056] Figure 3 is a perspective view schematically illustrating a cylindrical electrode assembly according to the present invention.

[0057] Figure 4 is a cross-sectional view schematically illustrating a first embodiment of a battery cell according to the present invention.

[0058] Fig. 5 is a cross-sectional view schematically illustrating the bonding structure of the electrode terminal portion of the battery cell of Fig. 4.

[0059] Fig. 6 is an exploded view schematically illustrating the electrode terminal portion of the battery cell of Fig. 5.

[0060] Fig. 7 is a cross-sectional view schematically illustrating the electrode terminal portion of the battery cell of Fig. 5.

[0061] Fig. 8 is a plan view schematically illustrating the electrode terminal portion of the battery cell of Fig. 5.

[0062] Figure 9 is a cross-sectional view schematically illustrating a state in which an electrode terminal portion according to the present invention is inserted into a terminal hole of a can housing.

[0063] Figure 10 is a cross-sectional view schematically illustrating a state in which the electrode terminal portion according to the present invention is inserted into the terminal hole of the can housing and the plastic deformation portion of the electrode terminal portion is bent outward.

[0064] Figure 11 is a cross-sectional view schematically illustrating a state in which an electrode assembly according to the present invention is inserted into a can housing.

[0065] Figures 12 and 13 are cross-sectional views schematically illustrating a state in which a terminal bolt portion according to the present invention is inserted into a restraining tab portion of a collector hole.

[0066] Fig. 14 is a cross-sectional view schematically illustrating a second embodiment of a battery cell according to the present invention.

[0067] Fig. 15 is a cross-sectional view schematically illustrating the bonding structure of the electrode terminal portion of the battery cell of Fig. 14.

[0068] Fig. 16 is a cross-sectional view schematically illustrating a third embodiment of a battery cell according to the present invention.

[0069] Fig. 17 is a cross-sectional view schematically illustrating the bonding structure of the electrode terminal portion of the battery cell of Fig. 16.

[0070] [Explanation of symbols]

[0071] 1: Battery cell 10: Can housing 11: Side wall member 12: Bottom member 14: Terminal hole 20: Electrode assembly 21: First electrode 22: Second electrode 23: Metal foil 24: Active material layer 25: Holding portion (coated portion) 26: Non-coated portion 27: Electrode tab (notched tab) 28: Separator 29: Core portion 30: Collector plate 31: Flat portion 32: Collector plate hole 33: Retaining tab portion 35: Protrusion portion 40: Insulator 50: Gasket 60: Electrode terminal portion 61: Terminal head portion 62: Receiving groove portion 63: Terminal insertion portion 64: Bolt hole portion 65: Plastic deformation portion 70: Terminal bolt portion 71: Bolt head portion 73: Bolt fastening portion 74: Bolt thread portion 80: Sealing member

[0072] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0073] The present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and with various modifications. However, these embodiments are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. Therefore, the present invention is not limited to the embodiments disclosed below, but should be understood to include all modifications, equivalents, and substitutes included within the technical spirit and scope of the present invention, as well as substitutions or additions of the components of one embodiment with those of another embodiment.

[0074] The attached drawings are merely intended to facilitate understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical ideas disclosed in this specification, but should be understood to encompass all modifications, equivalents, and substitutes included within the spirit and technical scope of the present invention. In the drawings, the components may be expressed in exaggerated sizes or thicknesses for ease of understanding, but the scope of protection of the present invention should not be construed as being limited thereby.

[0075] The terminology used in this specification is only used to describe specific implementations or examples and is not intended to limit the present invention. In addition, the singular expression includes the plural expression unless the context clearly indicates otherwise. In the specification, terms such as "comprises" and "consists of" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification. In other words, it should be understood that terms such as "comprises" and "consists of" in the specification do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0076] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0077] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0078] When a component is referred to as being "above" or "below" another component, it should be understood that it is not only positioned directly above that other component, but that there may also be other components present in between.

[0079] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0080] Hereinafter, a battery cell according to a first embodiment of the present invention will be described.

[0081] Hereinafter, battery cells according to embodiments of the present invention will be described.

[0082] FIG. 1 is an exploded perspective view schematically illustrating a separated state of an electrode and a separator constituting a battery cell according to the present invention, FIG. 2 is a perspective view schematically illustrating a laminated state of the electrode and separator of FIG. 1, and FIG. 3 is a perspective view schematically illustrating a cylindrical electrode assembly according to the present invention.

[0083] Referring to FIGS. 1 to 3, a cylindrical battery cell (1) according to an embodiment of the present invention includes an electrode assembly (20) and a can housing (10) that accommodates the electrode assembly (20).

[0084] The can housing (10: see Fig. 4) is formed in a cylindrical shape. The can housing (10) is formed of a conductive material and can be electrically connected to the negative electrode collector (30) of the electrode assembly (20).

[0085] The electrode assembly (20) includes a first electrode (21), a second electrode (22), and a separator (28) that extend in the longitudinal direction and have a predetermined width, as illustrated in FIG. 2. The electrode assembly (20) is manufactured in the form of a jelly-roll by forming a laminate in the order of the first electrode (21), the separator (28), the second electrode (22), and the separator (28), and then winding it around a winding shaft, as illustrated in FIG. 3. The electrode assembly (20) is formed in a cylindrical shape, and a core portion (29), which is an empty space, is formed in the center thereof.

[0086] The above first electrode (21) may be an anode, and the above second electrode (22) may be a cathode. Of course, the opposite may also be the case.

[0087] The above first electrode (21) and second electrode (22) are manufactured in the form of sheets. The electrode sheet is manufactured in the form of an active material layer (24) applied to the surface of a metal foil (23). The electrode has a holding portion (25) on which the active material layer (24) is applied, and a non-coated portion (26) on which the active material layer (24) is not applied. The positive electrode may have the non-coated portion (26) on one side in the width direction, and the negative electrode may have the non-coated portion (26) on the other side in the width direction.

[0088] The non-conductive portion (26) is exposed or protrudes in the width direction of the laminate. The non-conductive portion (26) itself functions as an electrode tab.

[0089] The above-mentioned non-conductive portion (26) may be provided with notches at predetermined intervals to form flag-shaped notched tabs (27). A plurality of notched tabs (27) may be arranged in a sawtooth shape along the longitudinal direction of the electrode.

[0090] In the embodiment, the notching tabs (27) are exemplified as having an equilateral trapezoidal shape. However, their shapes may be various, such as a semicircle, a semi-ellipse, a triangle, a rectangle, a parallelogram, etc.

[0091] In addition, the embodiment exemplifies a form in which the notching tabs (27) arranged along the longitudinal direction have the same width. However, the width of the notching tabs (27) may be gradually or stepwise widened from the core side to the outer periphery side.

[0092] In addition, in the embodiment, a form in which the height of the notching tabs (27) gradually increases from the core side to the outer circumference side is exemplified. However, the height of these notching tabs (27) may be implemented in a form in which they are constant or gradually decrease.

[0093] In addition, in the embodiment, a structure in which a notching tab (27) is deleted in a predetermined section of the centripetal end of the plain portion (26) and a predetermined section of the centrifugal end is exemplified. However, it is of course possible that the notching tab (27) is not deleted in the centripetal end of the plain portion (26), and that the notching tab (27) is not deleted in the centrifugal end of the plain portion (26).

[0094] In the jelly roll-shaped electrode assembly (20), the notched tabs (27) can be bent radially and flattened as shown in FIG. 3. The notched tabs (27) can be bent radially inward or outward. In the embodiment, a structure in which the notched tabs (27) are bent radially inward is exemplified.

[0095] The above-mentioned notched tabs (27) can be bent one by one during the process of forming a jelly roll-shaped electrode assembly (20) by winding the laminate. Alternatively, the above-mentioned notched tabs (27) can be bent all at once after the laminate is wound to form a jelly roll-shaped electrode assembly (20).

[0096] The notching tabs (27) of the first electrode (21) and the notching tabs (27) of the second electrode (22), which are bent and overlapped in the radial direction in this way, can provide a plane that is substantially perpendicular to the axial direction at each of the axial ends of the electrode assembly (20).

[0097] A current collector plate (30) can be joined to a substantially flat surface provided by bending the notched tabs (27) exposed at both axial ends of the electrode assembly (20), as shown in FIG. 4.

[0098] In an embodiment, the collector plate (30) bonded to one axial end of the electrode assembly (20) may be a negative collector plate, and the collector plate bonded to the other axial end of the electrode assembly (20) may be a positive collector plate. However, the collector plate on one side may be a positive collector plate, and the collector plate on the other side may be a negative collector plate.

[0099] The positive electrode collector plate may be made of aluminum, and the negative electrode collector plate may be made of copper. However, the materials are not limited thereto.

[0100] The above-mentioned current collector plate (30) can be manufactured by punching, trimming, piercing, and bending a metal sheet. However, it is obvious that the manufacturing process is not limited to this.

[0101] The above can housing (10) includes a bottom member (12), a side wall member (11) connected to the bottom member (12) and extending in the axial direction, and a lid (not shown) covering an open end of the side wall member (11).

[0102] The above-mentioned floor member (12) may have a disc shape, and the above-mentioned side wall member (11) may have a circular tube shape. The floor member (12) and the side wall member (11) may be formed integrally or connected by welding.

[0103] The above-mentioned bottom member (12) and side wall member (11) can be manufactured by forming a metal sheet with a nickel plated surface of steel using a deep drawing process, and trimming the front end of the side wall member (11) with a punch while holding it with a blank holder. Of course, the material of the can housing (10) is not limited to this.

[0104] According to an embodiment of the cylindrical battery cell (1), the current collector plate (30) is joined to one axial end, i.e., the bottom, of the electrode assembly (20). For example, the back surface of the current collector plate (30) and the electrode tab (27) can be welded by irradiating a laser onto the surface of the current collector plate (30). The periphery of the current collector plate (30) corresponds to the electrode tabs (27) of the electrode assembly (20), and the center of the current collector plate (30) is arranged to block the core portion (29) of the electrode assembly (20).

[0105] FIG. 4 is a cross-sectional view schematically illustrating a first embodiment of a battery cell according to the present invention, FIG. 5 is a cross-sectional view schematically illustrating a joining structure of an electrode terminal portion of the battery cell of FIG. 4, FIG. 6 is an exploded view schematically illustrating an electrode terminal portion of the battery cell of FIG. 5, FIG. 7 is a cross-sectional view schematically illustrating an electrode terminal portion of the battery cell of FIG. 5, and FIG. 8 is a plan view schematically illustrating an electrode terminal portion of the battery cell of FIG. 5.

[0106] Referring to FIGS. 4 to 8, a battery cell (10) according to a first embodiment of the present invention includes a can housing (10), a current collector (30), an insulator (40), an electrode terminal portion (60), and a terminal bolt portion (70).

[0107] The can housing (10) can accommodate an electrode assembly (20) therein. The can housing (10) can be formed in a cylindrical shape. The can housing (10) can include a bottom member (12) and a side wall member (11). A terminal hole (14) is formed in the bottom member (12) of the can housing (10). The terminal hole (14) can be formed in a circular shape at the center of the bottom member (12).

[0108] The current collector plate (30) may be joined to the axial end of the electrode assembly (20). The current collector plates (30) joined to each of the two axial ends of the electrode assembly (20) may be a positive current collector plate and a negative current collector plate. The positive current collector plate may be made of aluminum, and the negative current collector plate may be made of copper. However, the materials are not limited thereto.

[0109] The above current collector plate (30) can be manufactured by punching, trimming, piercing, or / and banding a metal plate. The current collector plate (30) has a diameter smaller than the diameter of the electrode assembly (20) and the inner circumferential surface of the can housing (10).

[0110] An insulator (40) may be placed between the can housing (10) and the collector plate (30). The insulator (40) is made of an insulating material to electrically insulate the bottom member (12) of the can housing (10) and the collector plate (30). The insulator (40) may be formed in a circular shape with a diameter larger than the diameter of the collector plate (30).

[0111] The battery cell (1) includes a gasket (50) interposed between the electrode terminal portion (60) and the peripheral portion of the terminal hole (14). The gasket (50) electrically insulates the electrode terminal portion (60) and the peripheral portion of the terminal hole (14).

[0112] The gasket (50) can be fitted into contact with the inner surface of the terminal hole (14). The gasket (50) is formed of an insulating material. The gasket (50) is formed in a tube shape to be inserted into the terminal hole (14), and a flange portion may be formed at one end. The flange portion is a portion that is in close contact with the outer surface of the can housing (10). The gasket (50) may be manufactured entirely of a compressible material that is elastic (stretchy).

[0113] The electrode terminal portion (60) is inserted into the terminal hole (14) and is plastically deformed to extend outwardly around the periphery of the terminal hole (14) and is fixed to the bottom member (12) of the can housing (10). At this time, the axial ends of the electrode terminal portion (60) are pressed against the periphery of the terminal hole (14) in the axial direction. The electrode terminal portion (60) is electrically isolated from the can housing (10) by the gasket (50) and is electrically connected to the positive electrode collector plate (30), thereby functioning as, for example, a positive electrode terminal.

[0114] The terminal bolt portion (70) may be fixed to the current collector plate (30) by passing through the electrode terminal portion (60). The terminal bolt portion (70) may include a bolt head portion (71) and a bolt fastening portion (73). The bolt head portion (71) may have a polygonal or circular cross-sectional shape. The bolt fastening portion (73) may extend axially from the bolt head portion (71). Screw threads are formed on the circumference of the bolt fastening portion (73), and the axial length of the screw threads may be formed longer than the height of the current collector plate hole (32). In some examples, the screw threads may be formed along the entire longitudinal direction of the bolt fastening portion (73).

[0115] Accordingly, since the terminal bolt portion (70) is fastened and restrained to the collector plate (30), there is no need to weld the electrode terminal portion (60) and the collector plate (30). In addition, the terminal bolt portion (70) can electrically connect the electrode terminal portion (60) and the collector plate (30). The collector plate (30) can be electrically connected to the electrode terminal portion (60) through the terminal bolt portion (70) or directly electrically connected to the electrode terminal portion (60). Accordingly, unlike a conventional battery cell, welding of the electrode terminal portion (60) and the collector plate (30) can be omitted, thereby preventing damage to the separator of the electrode assembly (20) due to spatter or heat energy generated during welding. In addition, electrical contact between the positive and negative electrodes due to damage to the separator can be prevented, and the possibility of a short circuit or fire can be significantly reduced.

[0116] In addition, there is no need to forcefully press the collector plate (30) with a welding electrode for welding to deform it and to bring the collector plate (30) into close contact with the electrode terminal portion (60). Accordingly, pre-tensioning of the collector plate (30) can be prevented.

[0117] A retaining tab portion (33) may be formed on the collector plate (30) to which a terminal bolt portion (70) is screw-connected. The retaining tab portion (33) may be formed on the inner peripheral surface of the collector plate (30) defining the collector plate hole (32). In one example, the retaining tab portion (33) may be formed in a screw thread shape having the same lead as the bolt thread portion (74) of the terminal bolt portion (70). The inner diameter of the retaining tab portion (33) is complementary to the outer diameter of the bolt thread portion (74), so that the bolt thread portion (74) and the retaining tab portion (33) can be easily screw-connected. Accordingly, the phenomenon of the retaining tab portion (33) or the bolt thread portion (74) being worn and generating particles during the screw-connection process can be prevented.

[0118] The diameter (D1) of the restraint tab portion (33) can be formed to be the same as or slightly larger than the diameter (D2) of the bolt hole portion (64) of the electrode terminal portion (60).

[0119] The collector plate (30) is formed in a flat shape, and the height of the restraining tab portion (33) can be formed to correspond to the thickness (T1) of the collector plate (30). Accordingly, as the thickness (T1) of the collector plate (30) increases, the height (P1) of the restraining tab portion (33) can increase. The height (P1) of the restraining tab portion (33) can be adjusted in consideration of the required fastening force between the terminal bolt portion (70) and the collector plate (30).

[0120] The electrode terminal portion (60) includes a terminal head portion (61) and a terminal insertion portion (63).

[0121] The terminal head portion (61) can be pressed against the periphery of the terminal hole (14). The terminal head portion (61) can be formed with an outer diameter larger than the inner diameter of the terminal hole (14). The terminal head portion (61) can be formed in a circular or polygonal shape. When the electrode terminal portion (60) is inserted into the terminal hole (14), the terminal head portion (61) catches on the periphery of the terminal hole (14) to prevent further insertion.

[0122] The terminal insertion portion (63) extends axially from the terminal head portion (61). The terminal insertion portion (63) is inserted into the terminal hole (14). In a structure in which an insulator (40) is provided, the terminal insertion portion (63) can be inserted into the insulator (40). A terminal bolt portion (70) can pass through the terminal insertion portion (63). The terminal insertion portion (63) can be brought into contact with the lower surface of the peripheral portion of the current collector (30) without being inserted into the current collector hole (32). The terminal insertion portion (63) can be formed in an overall cylindrical shape.

[0123] The electrode terminal portion (60) may further include a plastic deformation portion (65) that extends from the terminal insertion portion (63) and is bent radially outward. The plastic deformation portion (65) maintains the bent state even when the external force is removed. The plastic deformation portion (65) may be formed axially parallel to the end of the terminal insertion portion (63) before deformation. Since the plastic deformation portion (65) is caught and restrained around the periphery of the terminal hole (14) in a state where it is bent axially outward from the terminal insertion portion (63), the electrode terminal portion (60) can be prevented from being ejected or detached from the terminal hole (14) due to the gas pressure inside the can housing (10).

[0124] As the plastic deformation portion (65) is bent, the plastic deformation portion (65) can compress the gasket (50). In some examples, the plastic deformation portion (65) can compress the insulator (40). In some examples, the spherical deformation portion (65) can compress the gasket (50) and the insulator (40).

[0125] The plastic deformation portion (65) may include a plastic deformation rib extending axially at the end of the terminal insertion portion (63). In some examples, a plurality of plastic deformation ribs may be provided so as to be arranged along the circumferential direction of the terminal insertion portion (63). The plurality of plastic deformation ribs may be plastically deformed at once by a press portion inserted into the core portion of the electrode assembly. In some examples, the plastic deformation rib may have a circular tube shape extending along the circumferential direction of the terminal insertion portion (63). The plastic deformation ribs may be plastically deformed by the press portion inserted into the core portion of the electrode assembly.

[0126] The above-mentioned plastic deformation portion (65) and terminal head portion (61) primarily restrain the electrode terminal portion (60) to the terminal hole (14). In addition, the terminal bolt portion (70) is fastened to the current collector plate (30) to secondarily restrain the electrode terminal portion (60) to the current collector plate (30). Accordingly, the electrode terminal portion (60) can be prevented from being separated or detached from the terminal hole (14) or the current collector plate (30). Since the electrode terminal portion (60) is doubly restrained in this way, the restraining force and structural rigidity of the electrode terminal portion (60) can be significantly increased.

[0127] In addition, since the plastic deformation portion (65) is in close contact with one surface of the current collector plate (30) and the terminal bolt portion (70) is in close contact with the current collector plate hole (32) and the electrode terminal portion (60), the contact area between the positive terminal formed by the electrode terminal portion (60) and the terminal bolt portion (70) and the current collector plate (30) can be increased. Accordingly, the current conduction path is significantly increased, so the resistance loss of the battery cell can be reduced.

[0128] A bolt hole (64) may be formed in the terminal insertion portion (63) so that the bolt fastening portion (73) of the terminal bolt portion (70) may be inserted. The bolt hole (64) may be formed parallel to the axial direction of the terminal insertion portion (63) and may be arranged to correspond to the collector hole (32).

[0129] The height (P1) of the collector plate hole (32) can be formed to be equal to or slightly smaller than the thickness (T1) of the collector plate (30).

[0130] The diameter (D2) of the bolt hole (64) can be formed smaller than the diameter (D3) of the bolt fastening portion (73) of the terminal bolt portion (70) (D2 <D3). 예들 들면, 볼트홀부(64)의 직경(D2)은 볼트 체결부(73)의 나사산의 높이 정도만큼 작게 형성될 수 있다.

[0131] Accordingly, as the bolt fastening portion (73) is inserted, the peripheral portion of the bolt hole portion (64) can be plastically deformed. As the peripheral portion of the bolt hole portion (64) is plastically deformed, the plastically deformed portion of the bolt hole portion (64) can be pressed between the threads of the bolt fastening portion (73). In addition, as the bolt fastening portion (73) is pressed into the bolt hole portion (64), the terminal insertion portion (63) spreads outward in the radial direction (expands) and is pressed radially against the inner surface of the terminal hole (14). Since the terminal bolt portion (70) is pressed and fastened by the reaction force applied toward the center from the terminal insertion portion (63), the fastening force of the terminal bolt portion (70) and the electrode terminal portion (60) can be significantly increased. Then, even if the battery cell is exposed to an environment of continuous vibration, the phenomenon of the terminal bolt portion (70) loosening can be prevented in advance. In addition, the bolt fastening portion (73) is formed to dig into the inner surface of the bolt hole portion (64), thereby increasing the sealing force between the bolt fastening portion (73) and the terminal insertion portion (63).

[0132] A receiving groove (62) may be formed in the terminal head portion (61) to receive the bolt head portion (71) of the terminal bolt portion (70). The receiving groove (62) may be formed with a circular cross-section so that the terminal bolt portion (70) can rotate. The depth of the receiving groove (62) may be formed to be approximately the same as the thickness of the bolt head portion (71).

[0133] The above battery cell (10) may further include a sealing member (80) installed between the bolt head portion (71) of the terminal bolt portion (70) and the end of the receiving groove portion (62) of the terminal head portion (61). The sealing member (80) may be an O-ring. The sealing member (80) may seal the gap between the bolt head portion (71) and the receiving groove portion (62) to prevent leakage of the electrolyte. In addition, the sealing member (80) may prevent external air from penetrating into the interior of the can housing (10) through the gap between the bolt head portion (71) and the receiving groove portion (62).

[0134] A method for manufacturing a battery cell according to the first embodiment of the present invention configured as described above will be described.

[0135] FIG. 9 is a cross-sectional view schematically illustrating a state in which an electrode terminal part according to the present invention is inserted into a terminal hole of a can housing, FIG. 10 is a cross-sectional view schematically illustrating a state in which a plastic deformation part of the electrode terminal part according to the present invention is bent outward after being inserted into a terminal hole of a can housing, FIG. 11 is a cross-sectional view schematically illustrating a state in which an electrode assembly according to the present invention is inserted into a can housing, and FIGS. 12 and 13 are cross-sectional views schematically illustrating a state in which a terminal bolt part according to the present invention is inserted into a restraining tab part of a collector hole.

[0136] Referring to Fig. 9, a can housing (10) equipped with a terminal hole (14) is prepared (see Fig. 9). The terminal hole (14) is formed in the center of the bottom member (12) of the can housing (10). The terminal hole (14) of the can housing (10) is positioned on the lower side.

[0137] A gasket (50) is inserted axially into the terminal hole (14). When the flange portion of the gasket (50) contacts the outer surface of the can housing (10), the insertion of the gasket (50) is stopped.

[0138] After the gasket (50) is inserted into the terminal hole (14), the insulator (40) is placed on the inner surface of the bottom member (12). A hole is formed in the center of the insulator (40) of a size through which the terminal insertion portion (63) of the electrode terminal portion (60) can pass.

[0139] With the gasket (50) inserted into the terminal hole (14), the electrode terminal portion (60) is inserted into the terminal hole (14) from the axial outer side of the terminal hole (14). The electrode terminal portion (60) has a terminal head portion (61), a terminal insertion portion (63) extending in the axial direction, and a plastic deformation portion (65) extending from the axial end of the terminal insertion portion (63). The terminal insertion portion (63) and the plastic deformation portion (65) pass through the inner side of the gasket (50). The gasket (50) electrically insulates the electrode terminal portion (60) and the can housing (10).

[0140] Referring to Fig. 10, the plastic deformation portion (65) of the electrode terminal portion (60) is bent radially outward to bind the electrode terminal portion (60) to the terminal hole (14). At this time, the press portion (not shown) is lowered toward the inside of the can housing (10) to bend the plastic deformation portion (65) radially outward. The plastic deformation portion (65) is bent radially to compress the gasket (50). In some examples, the insulator (40) may also be compressed together.

[0141] Referring to Fig. 11, an electrode assembly with a collector plate (30) welded thereto is inserted into the interior of a can housing (10). The collector plate (30) is positioned so as to face the electrode terminal portion (60), and the collector plate hole (32) of the collector plate (30) is aligned with the bolt hole portion (64) of the electrode terminal portion (60).

[0142] The restraining tab portion (33) formed around the periphery of the above-mentioned collector hole (32) is concentric with the bolt hole portion (64). At this time, the inner diameter (D1) of the restraining tab portion (33) is equal to or slightly larger than the diameter (D2) of the bolt hole portion (64), and the diameter (D3) of the terminal bolt portion (70) is formed larger than the diameter (D2) of the bolt hole portion (64) (see Fig. 6).

[0143] Referring to FIGS. 12 and 13, the terminal bolt portion (70) passes through the bolt hole portion (64) and is then fastened to the restraining tab portion (33). The diameter of the bolt hole portion (64) is formed to be smaller than the diameter of the bolt fastening portion (73) of the terminal bolt portion (70), so that as the bolt fastening portion (73) is inserted into the bolt hole portion (64) and the restraining tab portion (33), the periphery of the bolt hole portion (64) is plastically deformed.

[0144] At this time, the end of the bolt fastening portion (73) is screw-connected to the restraining tab portion (33), and the bolt fastening portion (73) presses the terminal insertion portion (63) radially outward to push the terminal insertion portion (63) outward. Reflectively, the deformed portion of the terminal insertion portion (63) is pressed against the bolt fastening portion (73) as it is pushed between the threads of the bolt fastening portion (73). For this purpose, the electrode terminal portion (60) may be made of a softer metal than the terminal bolt portion (70). As a result, the electrode terminal portion (60), the collector plate (30), and the can housing (10) are mutually fixed by the screw fastening force of the terminal bolt portion (70) and the restraining tab portion (33) and the pressing force of the terminal bolt portion (70) and the terminal insertion portion (63).

[0145] Accordingly, the bonding strength and structural rigidity of the electrode terminal portion (60) are significantly increased, so that the electrode terminal portion (60) can be prevented from being ejected or detached from the terminal hole (14) in the event of thermal runaway of the battery pack.

[0146] Next, a battery cell according to a second embodiment of the present invention will be described. The second embodiment is substantially identical to the first embodiment except for the electrode terminal portion (60) and the terminal bolt portion (70). Therefore, identical components are assigned the same reference numerals and their descriptions are omitted.

[0147] Fig. 14 is a cross-sectional view schematically illustrating a second embodiment of a battery cell according to the present invention, and Fig. 15 is a cross-sectional view schematically illustrating a bonding structure of an electrode terminal portion of the battery cell of Fig. 14.

[0148] Referring to FIGS. 14 and 15, a battery cell (1) according to a second embodiment of the present invention includes a can housing (10), a current collector (30), an insulator (40), an electrode terminal portion (60), and a terminal bolt portion (70).

[0149] The electrode terminal portion (60) may include a terminal head portion (61) and a terminal insertion portion (63). In addition, the electrode terminal portion (60) may further include a plastic deformation portion (65).

[0150] A bolt hole portion (64) may be formed in the terminal insertion portion (63) so that the bolt fastening portion (73) of the terminal bolt portion (70) may be inserted. The bolt hole portion (64) may be formed parallel to the axial direction of the terminal insertion portion (63) and may be aligned with the collector hole (32) in the axial direction.

[0151] The diameter (D2) of the bolt hole portion (64) may be formed to be substantially the same as or slightly larger than the diameter (D3) of the bolt fastening portion (73) of the terminal bolt portion (70) (D2=D3). At this time, the inner diameter of the restraining tab portion (33) may be formed to be smaller than the diameter of the bolt hole portion (64). In addition, a bolt thread portion (74) is formed on the outer circumference of the bolt fastening portion (73), and the axial length (P2) of the bolt thread portion (74) may be formed to be slightly longer than the height (P1) of the restraining tab portion (33). Of course, the bolt thread portion (74) may also be formed on the entire bolt fastening portion (73).

[0152] Since the diameter (D3) of the bolt fastening portion (73) is formed to be equal to or slightly smaller than the diameter (D2) of the bolt hole portion (64), when the bolt fastening portion (73) is screw-connected to the restraining tab portion (33), the bolt hole portion (64) is hardly plastically deformed. In addition, when the bolt head portion (71) and the current collector plate (30) press the terminal insertion portion (63) on both axial sides by screw connection, the terminal insertion portion (63) can be pressed against the bolt fastening portion (73) while shrinking in the axial direction. For this purpose, the electrode terminal portion (60) can be made of a softer metal than the terminal bolt portion (70). As a result, the electrode terminal portion (60), the current collector plate (30), and the can housing (10) are mutually fixed by the screw coupling force of the terminal bolt portion (70) and the restraining tab portion (33) and the pressing force of the terminal bolt portion (70) and the terminal insertion portion (63).

[0153] At this time, the elastic force of the sealing member (80) is transmitted to the restraining tab portion (33) of the current collector plate (30) through the terminal bolt portion (70), thereby allowing the current collector plate (30) to be pressed against the electrode terminal portion (60). In addition, the elastic force can function as a tensioner to prevent loosening of the terminal bolt portion (70).

[0154] Next, a battery cell according to a third embodiment of the present invention will be described. Since the third embodiment is substantially identical to the first embodiment except for the current collector plate (30), the same components will be assigned the same reference numerals and their descriptions will be omitted.

[0155] Fig. 16 is a cross-sectional view schematically illustrating a third embodiment of a battery cell according to the present invention, and Fig. 17 is a cross-sectional view schematically illustrating a bonding structure of an electrode terminal portion of the battery cell of Fig. 16.

[0156] Referring to FIGS. 16 and 17, a battery cell (1) according to a third embodiment of the present invention includes a can housing (10), a current collector (30), an insulator (40), an electrode terminal portion (60), and a terminal bolt portion (70).

[0157] The electrode terminal portion (60) may include a terminal head portion (61) and a terminal insertion portion (63). In addition, the electrode terminal portion (60) may further include a plastic deformation portion (65).

[0158] The collector plate (30) includes a flat portion (31) formed in a flat shape, and a protrusion (35) formed to protrude from the flat portion (31) at a position corresponding to the terminal hole (14). The flat portion (31) may be formed in a flat, annular plate shape, and the protrusion (35) may be formed in a ring shape defining the collector plate hole (32). The flat portion (31) and the protrusion (35) are concentric with the collector plate hole (32).

[0159] The thickness (T2) of the protrusion (35) may be formed to be thicker than the thickness (T1) of the flat plate (31). For example, the thickness (T2) of the protrusion (35) may be formed to be approximately 10% to 100% of the thickness (T1) of the flat plate (31). If the thickness (T1) of the flat plate (31) is thick, the thickness (T1) of the flat plate (31) may be formed to be close to 100% of the thickness (T2) of the protrusion (35), and if the thickness (T1) of the flat plate (31) is thin, the thickness (T1) of the flat plate (31) may be formed to be close to 10% of the thickness (T2) of the protrusion (35).

[0160] A restraint tab portion (33) is formed on the inner surface of the above-mentioned collector hole (32). As the thickness (T2) of the protrusion (35) increases, the height (P2) of the restraint tab portion (33) can be increased. Since the terminal bolt portion (70) is screw-connected to the restraint tab portion (33), as the height (P2) of the restraint tab portion (33) increases, the fastening force between the restraint tab portion (33) and the terminal bolt portion (70) can be increased.

[0161] The inner diameter (D1) of the collector hole (32) may be formed to be equal to or slightly smaller than the diameter (D2) of the bolt hole portion (64). The height (P2) of the collector hole (32) and the restraining tab portion (33) may be formed to be equal to or slightly lower than the thickness (T2) of the protrusion portion (35).

[0162] The diameter (D2) of the bolt hole (64) may be formed smaller than the diameter (D3) of the bolt fastening portion (73). For example, the diameter (D2) of the bolt hole (64) may be formed smaller by the height of the bolt thread portion (74) of the bolt fastening portion (73).

[0163] Accordingly, as the bolt fastening portion (73) is inserted, the peripheral portion of the bolt hole portion (64) can be plastically deformed. As the peripheral portion of the bolt hole portion (64) is plastically deformed, the plastically deformed portion of the bolt hole portion (64) can be pressed between the threads of the bolt thread portion (74). In addition, as the bolt fastening portion (73) is pressed into the bolt hole portion (64), the terminal insertion portion (63) spreads outward in the radial direction (expands) and is pressed radially against the inner surface of the terminal hole (14). Reflectively, since the terminal bolt portion (70) is pressed and fastened by the reaction force applied toward the center from the terminal insertion portion (63), the fastening force of the terminal bolt portion (70) and the electrode terminal portion (60) can be significantly increased. Then, even if the battery cell is exposed to an environment of continuous vibration, the phenomenon of the terminal bolt portion (70) loosening can be prevented in advance. In addition, the bolt fastening portion (73) is formed to dig into the inner surface of the bolt hole portion (64), thereby increasing the sealing force between the bolt fastening portion (73) and the terminal insertion portion (63).

[0164] Meanwhile, in FIGS. 16 and 17, a structure in which a protrusion (35) of a current collector (30) protrudes in a direction away from an electrode terminal portion (60) is exemplified, but the protrusion may protrude in a direction toward the electrode terminal portion (60), or may protrude in both a direction toward the electrode terminal portion (60) and a direction away from it.

[0165] Furthermore, in the third embodiment, the relationship between the diameter (D2) of the bolt hole (64) and the diameter (D3) of the bolt fastening portion (73) in the second embodiment may be applied instead of the relationship between the diameters. Similarly, in the second embodiment, the structure of the protrusion (35) in the third embodiment may be applied. In this way, the features of each embodiment may be applied interchangeably or additionally. Of course, it is self-evident that some of the features of the embodiments may be applied without being applied.

[0166] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A can housing having an electrode assembly accommodated therein and a terminal hole provided; A current collector plate disposed at the axial end of the electrode assembly; An electrode terminal portion inserted into the terminal hole; and A battery cell comprising a terminal bolt portion that penetrates the electrode terminal portion and is fastened to the current collector plate and is restrained to the current collector plate.

2. In claim 1, the electrode terminal portion, A terminal head portion that presses the periphery of the terminal hole; and It includes a terminal insertion portion that extends from the terminal head portion and is inserted into the terminal hole; The above terminal bolt portion penetrates the terminal insert portion, the battery cell.

3. A battery cell according to claim 2, wherein the electrode terminal portion further includes a plastic deformation portion extending from the terminal insertion portion and bent to press against the peripheral portion of the terminal hole facing the terminal head portion.

4. A battery cell according to claim 3, wherein the plastic deformation portion includes a plastic deformation rib arranged along the circumferential direction at an end of the terminal insertion portion.

5. In claim 4, the plastic deformation rib extends continuously or intermittently along the circumferential direction, the battery cell.

6. A battery cell according to claim 2, wherein the terminal insertion portion has a bolt hole portion into which a bolt fastening portion of the terminal bolt portion is inserted.

7. A battery cell according to claim 6, wherein the inner diameter of the bolt hole is set smaller than the outer diameter of the bolt fastening portion so that the peripheral portion of the bolt hole is plastically deformed as the bolt fastening portion is inserted.

8. A battery cell according to claim 6, wherein the diameter of the bolt hole portion is set to correspond to or larger than the diameter of the terminal bolt portion.

9. A battery cell according to claim 6, wherein the terminal head portion has a receiving groove portion for receiving the bolt head portion of the terminal bolt portion.

10. A battery cell according to claim 1, wherein the current collector plate is provided with a restraining tab portion to which the terminal bolt portion is screw-connected.

11. In claim 10, the current collector plate is formed in a flat shape, A battery cell wherein the height of the above-mentioned restraint tab portion corresponds to or is thinner than the thickness of the above-mentioned current collector plate.

12. In claim 10, the current collector plate includes a flat portion formed in a flat shape, and a protrusion formed to protrude axially from the flat portion at a position corresponding to the terminal hole. A battery cell in which the above-mentioned restraint tab portion is formed to penetrate the above-mentioned protrusion portion.

13. A battery cell according to claim 1, further comprising a sealing member installed between the bolt head portion of the terminal bolt portion and the bottom surface of the receiving groove portion of the terminal head portion.

14. A battery cell according to claim 1, further comprising a gasket interposed between the inner surface of the terminal hole and the outer surface of the electrode terminal portion to electrically insulate and seal the electrode terminal portion and the can housing.

15. Steps for preparing a can housing with terminal holes: A step of inserting a gasket axially into the terminal hole; A step of inserting an electrode terminal portion into the terminal hole from the axial outer side of the terminal hole; A step of bending the plastic deformation portion of the electrode terminal portion radially outward to bind the electrode terminal portion to the terminal hole; A step of inserting an electrode assembly with a collector plate welded inside the can housing and corresponding the restraining tab portion of the collector plate to the bolt hole portion of the electrode terminal portion; and A method for manufacturing a battery cell, comprising: a step of fastening a terminal bolt portion to a restraining tab portion after passing through the bolt hole portion; 16. A method for manufacturing a battery cell according to claim 15, wherein the diameter of the bolt hole portion is formed smaller than the diameter of the bolt fastening portion of the terminal bolt portion, so that the peripheral portion of the bolt hole portion is plastically deformed as the bolt fastening portion is inserted.

17. In claim 15, the current collector plate includes a flat portion formed in a flat shape, and a protrusion formed to protrude from the flat portion at a position corresponding to the terminal hole. A method for manufacturing a battery cell, wherein the above-mentioned restraint tab portion is formed on the above-mentioned protrusion portion.

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