Battery cell and manufacturing method thereof

Abstract

A battery cell and a manufacturing method thereof are disclosed. The battery cell comprises: a can housing in which a receiving part is formed; an electrode assembly wound in a jelly-roll form with a separator interposed between a first electrode and a second electrode, the electrode assembly having a core part formed at the center thereof; and an electrode terminal part disposed at a first axial end of the can housing. The first electrode includes a first non-coated part on one axial side of the electrode assembly, the first non-coated part being not coated with an active material and protruding axially outward from the separator. In a first circumferential section of the first non-coated part disposed on a core part side, the first non-coated part is bent to cover the core part. The first non-coated part covering the core part in the first section is welded to the electrode terminal part

Description

Battery cell and manufacturing method thereof

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0089565, dated July 8, 2024, 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 eliminate some of the current collector plates, reduce the number of welding operations, and lower the resistance of the current path.

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

[0004] A cylindrical battery cell houses an electrode assembly within a can housing. The bottom surface of the can housing may be welded to a negative current collector, and the vent may be welded to a positive current collector. The can housing may form the negative electrode, and the vent may form the positive electrode.

[0005] Recently, a cylindrical battery cell with a novel structure has been developed. Such a battery cell may include a beading crimping area where a vent portion is mounted and a rivet area containing a positive terminal portion. A vent plate with a vent portion may be installed in the beading crimping area, and a rivet terminal portion may be installed in the rivet area. An insulating gasket may be interposed between the reset terminal portion and the terminal hole of the can housing. A negative current collector plate and a positive current collector plate are welded to both sides of the electrode assembly. The negative current collector plate may be welded to the vent plate, and the positive current collector plate may be welded to the rivet terminal portion.

[0006] However, conventional battery cells weld the positive electrode collector to the riveted terminal and the negative electrode collector to the vent plate. Therefore, the high-temperature energy and spatter generated during welding can tear or damage the separator of the cylindrical electrode assembly (jelly roll). If the separator is torn or damaged, the positive and negative electrodes may come into electrical contact, potentially resulting in a short circuit or fire.

[0007] Additionally, the positive and negative collector plates can be ultrasonically or laser welded. During ultrasonic or laser welding, welding defects may occur due to defective collector plates or oil. If a welding defect occurs at the welded portion of the collector plates, the tensile strength of the welded portion is significantly reduced, potentially causing low voltage generation.

[0008] Conventional battery cells are equipped with a circular ring-shaped insulator to resistively weld the center of the current collector plate to the center of the can bottom. The insulator is interposed between the can bottom and the current collector plate. Since the insulator is formed as a flat plate with a certain thickness, and the current collector plate is also formed as a flat plate, the current collector plate must be strongly deformed by pressing it with a welding electrode to ensure that it adheres tightly to the bottom surface of the can housing.

[0009] During this process, the current collector plate is excessively deformed, and the welded area becomes pre-tensioned, making it unstable. 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. This is because repeated and continuous tension and stress can cause fatigue failure. This can damage the electrical connection and potentially cause the battery cell to lose its 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 omit the installation of some current collector plates and reduce the number of welding operations.

[0012] The purpose of the present invention is to provide a battery cell capable of reducing resistance in a current pass and a method for manufacturing the same.

[0013] The purpose of the present invention is to provide a battery cell and a manufacturing method thereof that can prevent damage to a separator in an electrode assembly.

[0014] The purpose of the present invention is to provide a battery cell and a method for manufacturing the same that can significantly reduce the risk of short circuit or fire.

[0015] 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.

[0016] The present invention can be applied to a battery cell including a can housing having a receiving portion formed therein, an electrode assembly received in the receiving portion, and an electrode terminal portion disposed at an axial first end of the can housing.

[0017] The above electrode assembly may be wound in a jelly-roll shape with a separator interposed between the first electrode and the second electrode. A hollow core portion may be formed at the center of the electrode assembly.

[0018] The first electrode includes a first non-coated portion not coated with an active material at an axial first end of the electrode assembly, and the first non-coated portion may protrude axially outwardly from the separator.

[0019] In order to solve the above-described problem, the first non-conductive portion is bent to cover the core portion in a first circumferential section arranged on the core portion side, and the first non-conductive portion covering the core portion in the first section is welded to the electrode terminal portion.

[0020] The first non-conductive portion covering the core portion of the first section may be the first tab of the first electrode.

[0021] In some examples, the first tab may include a plurality of first notching tabs that extend axially, are spaced apart circumferentially, and are bent to cover the core portion.

[0022] Preferably, the bending can be done in a radial direction.

[0023] Preferably, the axial height of the first notching tap can be formed to be 0.5 to 1 times the diameter of the core portion.

[0024] Preferably, at least some of the circumferentially adjacent notching tabs among the plurality of first notching tabs can overlap in the axial direction.

[0025] Preferably, at least some of the radially facing notching tabs among the plurality of first notching tabs can overlap in the axial direction.

[0026] In some examples, a terminal hole is formed in the axial first end of the can housing, the electrode terminal portion is press-fitted into the terminal hole, and a first gasket is interposed between the terminal hole and the electrode terminal portion to electrically insulate the electrode terminal portion and the can housing.

[0027] In some examples, the second electrode may include a second tab protruding from the axial second end of the electrode assembly.

[0028] Preferably, the second electrode may include a second non-coated portion not coated with an active material at the axial second end of the electrode assembly.

[0029] Preferably, the second non-stick portion may protrude axially outwardly from the separator.

[0030] The second non-stick portion protruding axially outward from the above separator may be the second tab.

[0031] In some examples, the axial second end of the electrode assembly may be provided with a current collector plate that is connected to the second tab.

[0032] Preferably, the above joint may be a weld.

[0033] In some examples, the collector plate may be electrically connected to the can housing.

[0034] In some examples, the periphery of the collector plate may be in close contact with the can housing.

[0035] Preferably, the second tab may include a plurality of second notching tabs formed to extend axially and be spaced apart from each other in the circumferential direction.

[0036] In some examples, the second tab may be bent so as not to obscure the core portion.

[0037] Preferably, the bending can be done in a radial direction.

[0038] In some examples, a vent plate may be provided that is axially outwardly disposed from the collector plate and is secured to the can housing.

[0039] Preferably, the periphery of the vent plate can be fixed to the can housing.

[0040] In some examples, the perimeter of the vent plate may be pressed against the crimping portion of the can housing.

[0041] In some examples, the perimeter of the vent plate may be welded to the can housing.

[0042] In some examples, the collector plate may be secured to the can housing.

[0043] Preferably, the periphery of the above-mentioned collector plate can be fixed to the above-mentioned can housing.

[0044] In some examples, the perimeter of the collector plate may be pressed against the crimping portion.

[0045] In some examples, the perimeter of the collector plate may be welded to the can housing.

[0046] In some examples, the perimeter of the collector plate may be welded to the vent plate.

[0047] Preferably, the collector plate and the vent plate can be fixed together to the can housing.

[0048] In some examples, the perimeter of the collector plate and the perimeter of the vent plate may be pressed against the can housing by a crimping portion of the can housing.

[0049] In some examples, the perimeter of the collector plate and the perimeter of the vent plate may be welded together to the can housing.

[0050] Preferably, the vent plate and the can housing may be electrically insulated.

[0051] In some examples, the periphery of the collector plate may be in close contact with the can housing, and the periphery of the vent plate may be pressed against the periphery of the can housing and the collector plate with the second gasket interposed therebetween.

[0052] The present invention provides a method for manufacturing the above-described battery cell.

[0053] A method for manufacturing a battery cell according to the present invention includes a terminal installation step of installing an electrode terminal portion in a terminal hole formed at an axial first end portion of a can housing, an electrode assembly insertion step of inserting an electrode assembly into the inside of the can housing, and a welding step of welding a plurality of first notching tabs bent to cover a first end portion of a core portion of the electrode assembly to the electrode terminal portion.

[0054] The above manufacturing method may further include a fixing step of fixing a current collector plate and a vent plate welded to the axial other side of the electrode assembly to the axial second end of the can housing.

[0055] The above terminal installation step may include a step of inserting a first gasket into the periphery of the terminal hole, a step of inserting the electrode terminal portion into the inside of the terminal hole, and a step of pressing and fixing the electrode terminal portion to the periphery of the terminal hole.

[0056] In the above electrode assembly insertion step, the electrode assembly, in which the current collector plate is welded to the axial second end, can be inserted into the inside of the can housing.

[0057] The above welding step may include a step of inserting a welding rod into the core portion of the can housing and welding the first notching tab to the electrode terminal portion.

[0058] The above welding step may further include a step of turning the can housing over so that the opening of the can housing faces upward before inserting the welding rod.

[0059] In the above fixing step, the peripheral portion of the current collector plate and the peripheral portion of the vent plate can be pressed against the crimping portion of the can housing so that the current collector plate is electrically connected to the can housing.

[0060] The peripheral portion of the current collector plate is in close contact with the can housing, and a second gasket is interposed between the current collector plate and the vent plate, and between the vent plate and the crimping portion, so that the vent plate can be electrically insulated from the can housing.

[0061] From another perspective, a battery cell according to the present invention comprises: a can housing in which a receiving portion is formed; an electrode assembly wound in a jelly-roll shape with a separator interposed between a first electrode and a second electrode, and a core portion formed at the center; and an electrode terminal portion disposed at an axial first end of the can housing, wherein the first electrode includes a first bare portion not coated with an active material on one axial side of the electrode assembly, the first bare portion protruding axially outward from the separator, and in a first circumferential section of the first bare portion disposed on the core portion side, the first bare portion is bent to cover the core portion, and the first bare portion covering the core portion of the first section can be welded to the electrode terminal portion.

[0062] The first non-removable portion covering the core portion of the first section may include a plurality of first notching tabs that extend in the axial direction, are formed to be spaced apart from each other in the circumferential direction, and are bent to cover the core portion.

[0063] The axial height of the above first notching tap can be formed to be 0.5 to 1 times the diameter of the core portion.

[0064] Among the plurality of first notching tabs, at least some of the circumferentially adjacent notching tabs may overlap in the axial direction.

[0065] Among the plurality of first notching taps, at least some of the notching taps facing each other in the diametric direction can overlap in the axial direction.

[0066] A terminal hole is formed at the axial first end of the can housing, the electrode terminal portion is press-fitted into the terminal hole, and a first gasket is interposed between the terminal hole and the electrode terminal portion to electrically insulate the electrode terminal portion and the can housing.

[0067] From another perspective, a battery cell according to the present invention may include: a can housing in which a receiving portion is formed; an electrode assembly in which a separator is interposed between a first electrode and a second electrode and wound in a jelly-roll shape, a core portion is formed at the center, first notched tabs of the first electrode are bent to cover one side of the core portion, and second notched tabs of the second electrode are bent to open the other side of the core portion; an electrode terminal portion disposed at an axial first end of the can housing, the first notched tabs bent to cover one side of the core portion being welded; a current collector plate disposed at the other axial side of the electrode assembly and welded to the second notched tabs; and a vent plate disposed at the other axial side of the current collector plate and fixed to the can housing together with the current collector plate.

[0068] The first electrode includes a first non-coated portion on one axial side of the electrode assembly that is not coated with an active material, and the first non-coated portion is formed with a plurality of first notched tabs that protrude axially outwardly from the separator, and in a first circumferential section of the first non-coated portion arranged on one side of the core portion, the plurality of first notched tabs of the first section are bent to cover the core portion, and the first notched tabs covering one side of the core portion of the first section can be welded to the electrode terminal portion.

[0069] The axial height of the above first notching tap can be formed to be 0.5 to 1 times the diameter of the core portion.

[0070] Among the plurality of first notching tabs, at least a portion of the first notching tabs adjacent in the circumferential direction may overlap in the axial direction.

[0071] Among the plurality of first notching taps, at least a portion of the first notching taps facing each other in the radial direction may overlap in the axial direction.

[0072] A terminal hole is formed at the axial first end of the can housing, the electrode terminal portion is press-fitted into the terminal hole, and a first gasket is interposed between the periphery of the terminal hole and the electrode terminal portion to electrically insulate the electrode terminal portion and the can housing.

[0073] The periphery of the above current collector plate and the periphery of the above vent plate are pressed against the crimping portion of the above can housing, and the above current collector plate can be electrically connected to the above can housing.

[0074] The peripheral portion of the current collector plate is in close contact with the can housing, and a second gasket is interposed between the current collector plate and the vent plate and between the current collector plate and the crimping portion, so as to electrically insulate the vent plate and the can housing.

[0075] From another perspective, a method for manufacturing a battery cell according to the present invention may include: a terminal pressing step in which an electrode terminal portion is pressed into a terminal hole formed on one axial side of a can housing; an insertion step in which an electrode assembly is inserted into the inside of the can housing; a welding step in which a plurality of first notched tabs bent to cover one side of a core portion of the electrode assembly are welded to the electrode terminal portion; and a crimping step in which a current collector plate and a vent plate welded to the other axial side of the electrode assembly are crimped and fixed to the other side of the can housing.

[0076] The above terminal pressing step may include a step of inserting a first gasket into the peripheral portion of the terminal hole; a step of inserting the electrode terminal portion into the inside of the terminal hole; and a step of pressing and fixing the electrode terminal portion to the peripheral portion of the terminal hole.

[0077] In the above insertion step, the electrode assembly with the collector plate welded to the axial side can be inserted into the inside of the can housing.

[0078] The above welding step may include a step of turning over the can housing so that the opening of the can housing faces upward; and a step of inserting a welding rod into the core portion of the can housing to weld the first notching tab to the electrode terminal portion.

[0079] In the crimping step, the periphery of the current collector plate and the periphery of the vent plate are pressed against the crimping portion of the can housing, and the current collector plate can be electrically connected to the can housing.

[0080] The peripheral portion of the current collector plate is in close contact with the can housing, and a second gasket is interposed between the current collector plate and the vent plate and between the current collector plate and the crimping portion so that the vent plate can be electrically insulated from the can housing.

[0081] According to the present invention, since one side of the electrode assembly and the electrode terminal are directly welded, a current collector plate may not be installed between the axial side of the electrode assembly and the electrode terminal. Accordingly, the number of battery cell components can be reduced, and the process of supplying and installing the current collector plate can be omitted during the battery cell manufacturing process.

[0082] According to the present invention, since the electrode terminal portion and the first non-conductive portion (first notched tabs) are electrically connected through a single welding, the number of welding times can be reduced during the manufacturing process of a battery cell.

[0083] According to the present invention, since one side of the electrode assembly is directly welded to the electrode terminal portion, resistance can be reduced in the current-flowing current path.

[0084] According to the present invention, since the first notching tabs arranged on one side of the electrode assembly are directly welded to the electrode terminal portion, there is no need to strongly press the current collector plate with a welding rod.

[0085] 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.

[0086] 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.

[0087] Fig. 2 is a perspective view schematically illustrating the stacking state of the electrode and separator of Fig. 1.

[0088] Figure 3 is a perspective view schematically illustrating a cylindrical electrode assembly according to the present invention.

[0089] Figure 4 is a perspective view schematically illustrating a first embodiment of a battery cell according to the present invention.

[0090] Figure 5 is a cross-sectional view schematically illustrating a first embodiment of a battery cell according to the present invention.

[0091] Figure 6 is an exploded view schematically illustrating the battery cell of Figure 5.

[0092] Fig. 7 is a schematic diagram illustrating the first electrode of the electrode assembly of Fig. 5.

[0093] Fig. 8 is a schematic exploded view of the second electrode of the electrode assembly of Fig. 5.

[0094] Fig. 9 is a schematic drawing showing a state in which the first notching tabs overlap in the circumferential direction in the core portion of the electrode assembly of Fig. 5.

[0095] Fig. 10 is a schematic drawing showing a state in which the first notching tabs overlap in the diametric direction in the core portion of the electrode assembly of Fig. 5.

[0096] Fig. 11 is a perspective view schematically illustrating a state in which the first notching tabs are bent on one side of the core portion of the electrode assembly of the present invention.

[0097] Fig. 12 is a cross-sectional view schematically illustrating a state in which one side of the core portion of the electrode assembly of the present invention is covered by the first notching tabs.

[0098] Fig. 13 is a cross-sectional view schematically illustrating a state in which first notching tabs covering the core portion of the electrode assembly of the present invention are welded to the electrode terminal portion.

[0099] Fig. 14 is a cross-sectional view schematically illustrating a state in which an electrode terminal portion according to the present invention is pressed into a terminal hole of a can housing.

[0100] Figure 15 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.

[0101] Fig. 16 is a cross-sectional view schematically illustrating a state in which the first notching tabs of the electrode assembly according to the present invention are welded to the electrode terminal portion.

[0102] Figure 17 is an enlarged view schematically illustrating a state in which the first notching tabs of the electrode assembly according to the present invention are welded to the electrode terminal portion.

[0103] Fig. 18 is a cross-sectional view schematically illustrating a state in which a vent plate and a collector plate are pressed and fixed to the axial side of a can housing according to the present invention.

[0104] Figure 19 is a flowchart schematically illustrating a method for manufacturing a battery cell according to the present invention.

[0105] [Explanation of symbols]

[0106] 1: Battery cell 10: Can housing 11: Side wall member 12: Bottom member 14: Terminal hole 16: Beading groove 17: Crimping portion 20: Electrode assembly 21: First electrode 22: Second electrode 23: Metal foil 24: Active material layer 25: Holding portion 251: First holding portion 252: Second holding portion 26: Non-holding portion 261: First non-holding portion 262: Second non-holding portion 27: Notching tab 271: First notching tab 271a: First notching groove 272: Second notching tab 272a: Second notching groove 273: Notching tab of first section 275: Welding area 28: Separator 29: Core portion L1: First section L2: Second section H1: Height of first notching tab H2: Height of the second notching tab 30: Insulator 32: Tape 40: Electrode terminal 42: First gasket 50: Current collector plate (negative current collector plate) 60: Second gasket 70: Vent plate 72: Notch

[0107] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] Hereinafter, a battery cell according to an embodiment of the present invention will be described.

[0116] FIG. 1 is an exploded perspective view schematically illustrating a state in which an electrode and a separator constituting a battery cell according to the present invention are separated, FIG. 2 is a perspective view schematically illustrating a state in which the electrode and separator of FIG. 1 are laminated, and FIG. 3 is a perspective view schematically illustrating a cylindrical electrode assembly according to the present invention.

[0117] Referring to FIGS. 1 to 3, a cylindrical battery cell (1) according to an embodiment of the present invention includes an electrode assembly (20) accommodated in a can housing (10).

[0118] The electrode assembly (20) includes a first electrode (21), a second electrode (22), and a separator (28) extending in the longitudinal direction with a predetermined width as illustrated in FIG. 1. 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) as illustrated in FIG. 2, and then winding it around a core 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.

[0119] 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.

[0120] The above first electrode (21) and second electrode (22) are manufactured in the form of sheets. The electrode sheets are manufactured in the form in which an active material layer (24) is applied to the surface of a metal foil (23). The electrodes (21, 22) have 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.

[0121] A first holding portion (251) may be formed on the first electrode (21), and a second holding portion (252) may be formed on the second electrode (22). The first holding portion (251) may occupy most of the area of ​​the first electrode (21), and the second holding portion (252) may occupy most of the area of ​​the second electrode (22).

[0122] The non-coated portion (26) is exposed or protrudes in the width direction of the laminate. The non-coated portion (26) itself functions as an electrode tab. A first non-coated portion (261) may be formed on the first electrode (21), and a second non-coated portion (262) may be formed on the second electrode (22).

[0123] The above-mentioned non-coated portion (26) may be provided with notches (271a, 272a; see FIGS. 7 and 8) 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. A plurality of first notched tabs (271, 273) may be formed along the longitudinal direction of the first non-coated portion (261) in the first non-coated portion (261), and a plurality of second notched tabs (272) may be formed along the longitudinal direction of the second non-coated portion (262) in the second non-coated portion (262).

[0124] 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.

[0125] In the embodiment, a form in which notching tabs (27) arranged along the longitudinal direction have the same width is exemplified. However, the width of the notching tabs (27) may be gradually or stepwise widened from the core side to the outer circumference side.

[0126] In the embodiment, a form in which the heights (H1, H2; see Figs. 7 and 8) of the notching tabs (27) gradually increase from the core side to the outer circumference side is exemplified. However, the heights (H1, H2) of these notching tabs (27) may be implemented in a constant or gradually decreasing form.

[0127] In the embodiment, a structure is exemplified 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. 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).

[0128] 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. On one axial side of the electrode assembly (20), a plurality of first notched tabs (271, 273) can be bent and flattened, and on the other axial side of the electrode assembly (20), a plurality of second notched tabs (272) can be bent and flattened.

[0129] The first section (L1) of the first electrode (21) and the second section (L2) of the second electrode (22) are sections that are arranged on the core side of the first electrode and the second electrode and are wound several to several dozen times around the inner circumference of the core. These first section (L1) and second section (L2) can be varied in various ways depending on the size of the electrode assembly (20) and the size of the core (29).

[0130] The first notching tab (273) formed in the first section (L1) of the first electrode (21) is bent to cover one side of the core portion (29) of the electrode assembly (20) and is a portion to be welded to the electrode terminal portion (40). Since the first notching tab (273) includes an aluminum material and the electrode terminal portion (40) also includes an aluminum material, the first notching tab (273) and the electrode terminal portion (40) can be ultrasonically welded. In addition, since almost the same material is ultrasonically welded, sufficient bonding strength can be secured. Of course, the welding method is not limited to this. The embodiment does not exclude various welding methods such as laser welding or resistance welding.

[0131] The drawing symbol of the first notching tab of the first section (L1) is given to distinguish it from the drawing symbol of most of the first notching tabs (271) of the first electrode (21). The second notching tab is not formed in the second section (L2) of the second electrode (22).

[0132] In the embodiment, a structure in which the notching tab (27) is bent radially inward is exemplified.

[0133] 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).

[0134] The first notched tabs (271, 273) of the first electrode (21) and the second notched tabs (272) of the second electrode (22), which are bent and overlapped in the radial direction in this way, can provide a flat surface substantially perpendicular to the axial direction at both axial ends of the electrode assembly (20), respectively. The first notched tabs (271, 273) of the first electrode (21) can form a flat surface on one axial side of the electrode assembly (20), and the second notched tabs (272) of the second electrode (22) can form a flat surface on the other axial side of the electrode assembly (20).

[0135] FIG. 4 is a perspective 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 first embodiment of a battery cell according to the present invention, and FIG. 6 is an exploded view schematically illustrating the battery cell of FIG. 5.

[0136] Referring to FIGS. 4 to 6, a battery cell (10) according to an embodiment of the present invention includes a can housing (10), an electrode assembly (20), and an electrode terminal portion (40).

[0137] The can housing (10) may be formed in a cylindrical shape with a bottom member (12) arranged on one axial side and an open axial side. The can housing (10) may be formed of a conductive material and may be electrically connected to a current collector (50) of an electrode assembly (20) to become a part of the negative electrode.

[0138] The above can housing (10) includes a bottom member (12) and a side wall member (11) connected to the bottom member (12) and extending in the axial direction. The bottom member (12) may have a disc shape, and the side wall member (11) may have a circular tube shape. The bottom member (12) and the side wall member (11) may be integrally formed or assembled by various connecting methods such as welding.

[0139] The above-mentioned bottom member (12) and side wall member (11) can be manufactured by forming a metal sheet with a nickel plating on the surface of steel or aluminum 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 and manufacturing method of the can housing (10) are not limited to this.

[0140] The electrode assembly (20) is wound in a jelly-roll shape with a separator interposed between the first electrode and the second electrode, and a core portion (29) is formed in the center. The core portion (29) is used as an injection passage through which an electrolyte is injected and can be used as an exhaust passage for internal gas.

[0141] On one axial side of the electrode assembly (20), a plurality of first notched tabs (271, 273) of the wound first electrode (21) can be folded flat. The plurality of first notched tabs (271, 273) can be folded radially inward or outward of the electrode assembly (20). The folded first notched tabs (271, 273) can be arranged in a circular shape that covers one side of the core portion (29).

[0142] On the axial side of the electrode assembly (20), a plurality of second notching tabs (272) of the wound second electrode (22) can be bent flat. The plurality of second notching tabs (272) can be bent radially inward or outward of the electrode assembly (20). The bent second notching tabs (272) are arranged in an overall circular ring shape and can be concentric with the core portion (29). The bent second notching tabs (272) open the other side of the core portion (29) without covering it so that the welding rod (100) can be inserted up to one side of the core portion (29).

[0143] In this embodiment, a current collector plate (positive current collector plate) is not installed on one axial side of the electrode assembly (20), and a current collector plate (50) (negative current collector plate) is welded only on the other axial side of the electrode assembly (20).

[0144] The above electrode assembly (20) has a hollow core portion (29) formed in the center. One axial side of the core portion (29) is covered by the first notching tabs (273), and the other axial side of the core portion (29) is open.

[0145] A tape (32) is attached and installed on one axial side (upper side) of the electrode assembly (20). The tape (32) may be formed in a ring shape to surround one edge of the electrode assembly (20). The tape (32) may protect one edge of the electrode assembly (20).

[0146] An insulator (30) may be arranged on one axial side of the electrode assembly (20). A center hole may be formed in the center of the insulator (30) to correspond to the core portion (29) of the electrode assembly (20). The insulator (30) may be formed in a circular shape. The insulator (30) is interposed between one end of the electrode assembly (20) and the bottom member of the can housing (10) to electrically insulate the electrode assembly (20) and the can housing (10).

[0147] A terminal hole (14) is formed on one axial side of the can housing (10). The terminal hole (14) is formed in a circular shape. The terminal hole (14) may face the core portion (29) of the electrode assembly (20).

[0148] A first gasket (42) is arranged around the periphery of the terminal hole (14). The first gasket (42) may be formed in an annular shape to surround the periphery of the terminal hole (14). The first gasket (42) electrically insulates the electrode terminal portion (40) and the can housing (10).

[0149] The electrode terminal portion (40) is arranged at the axial first end of the can housing (10), and first notched tabs (273) bent to cover one side of the core portion (29) are directly welded to the electrode terminal portion (40). The electrode terminal portion (40) can be installed in the can housing (10) by inserting a rivet terminal into the terminal hole (14) while the first gasket (42) is inserted into the terminal hole (14), and pressing the rivet terminal from both axial sides to press-fix it to the periphery of the terminal hole (14). The electrode terminal portion (40) may be a positive terminal portion that is electrically insulated from the can housing (10) by the first gasket (42) and connected to the first notched tabs (273) of the electrode assembly (20). Additionally, the first notching tabs (273) may be positive tabs formed on the first electrode (21), which is the positive electrode. The welding portion (275) of the first notching tabs (273) is fused to one surface of the electrode terminal portion (70).

[0150] In this embodiment, since the electrode terminal portion (40) and the first notched tabs (273) of the electrode assembly (20) are directly welded, there is no need to install a current collector between one axial side of the electrode assembly (20) and the electrode terminal portion (40). According to the embodiment, the negative electrode current collector (50) is installed only on the other axial side of the electrode assembly (20).

[0151] The electrode terminal portion (40) and the first notched tabs (273) of the electrode assembly (20) can be joined, for example, by ultrasonic welding. Of course, various welding methods such as laser welding and resistance welding can be applied. In addition, the welding can be performed inside the can housing or outside the can housing.

[0152] In a conventional battery cell, the positive tabs and the positive current collector of the electrode assembly (20) are first welded, the electrode assembly (20) is inserted into the can housing (10), and then the positive current collector and the positive terminal are secondarily welded. That is, in the conventional battery cell, the positive current collector (50) is used as a medium to electrically connect the positive tab and the positive terminal. In contrast, in the present embodiment, the first notched tabs (273) on one axial side of the electrode assembly (20) are directly welded to the electrode terminal (40), so that the welding process for joining the current collector (50) and the first notched tabs (273) can be omitted. That is, while the conventional battery cell electrically connects the positive terminal and the positive tabs through two welding steps, in the present embodiment, the electrode terminal (40) and the first notched tabs (273) can be electrically connected with only one welding step. As a result, the battery cell (1) of the present embodiment can omit one current collector plate and reduce the number of welding steps.

[0153] In addition, since a current collector plate is not installed on one axial side of the electrode assembly (20), a welding process for joining the current collector plate to one side of the electrode assembly (20) can be omitted. In addition, since one side of the electrode assembly (20) is directly welded to the electrode terminal portion (40), resistance can be reduced in the current-flowing current path. In other words, low resistance can be implemented between the electrode assembly and the electrode terminal portion.

[0154] In addition, since the first notching tabs arranged on one side of the electrode assembly are directly welded to the electrode terminal portion, there is no need to strongly press the first notching tabs with a welding rod, unlike when pressing the collector plate.

[0155] The above battery cell (1) includes a current collector (50) arranged on the axial side of the electrode assembly (20). The current collector (50) is welded to second notched tabs (272) bent on the axial side of the electrode assembly (20). The second notched tab (272) may be a negative tab formed on the second electrode (22), which is a negative electrode.

[0156] The vent plate (70) is arranged on the axial side (lower side) of the current collector (50) and is pressed and fixed to the can housing (10) together with the current collector (50). The vent plate (70) is formed in a circular shape to close the opening of the can housing (10). The vent plate (70) includes a notch (72) that is cut or torn when the internal pressure of the can housing (10) increases above a preset pressure. The notch (72) may be formed in a circular or perforated shape along the circumferential direction of the vent plate (70).

[0157] A second gasket (60) is installed around the periphery of the vent plate (70). The second gasket (60) may be formed in an annular shape to surround the vent plate (70).

[0158] The periphery of the collector plate (50) and the periphery of the vent plate (70) can be pressed against the crimping portion (17) of the can housing (10). A beading groove (16) is formed on the axial other side of the can housing (10) to support the axial other side of the electrode assembly (20). The beading groove (16) is recessed into the inside of the can housing (10) and is formed in an annular shape along the circumference of the can housing (10). The crimping portion (17) is connected to the axial other side of the beading groove (16) and is formed by caulking the axial end of the side wall member (11) radially inward to press-fix the periphery of the collector plate (50) and the periphery of the vent plate (70).

[0159] The periphery of the current collector (50) is in close contact with the inner surface of the can housing (10) where the beading groove (16) is formed, and is electrically connected to the can housing (10). The current collector (50) may be a negative current collector (50) that electrically connects the second notched tab (272) of the second electrode (22), which is the negative electrode, and the can housing (10).

[0160] The second gasket (60) is installed to surround the upper and lower surfaces and the outer surface of the edge of the vent plate (70) and extend in the circumferential direction of the vent plate (70). Accordingly, the second gasket (60) is interposed between the vent plate (70) and the collector plate (50), and between the vent plate (70) and the beading groove (16) and crimping portion (17) of the can housing (10), thereby electrically insulating the vent plate (70) from the collector plate (50) and the can housing (10). Accordingly, the vent plate (70) may be a non-polar plate.

[0161] Fig. 7 is a schematic development diagram of the first electrode of the electrode assembly of Fig. 5, and Fig. 8 is a schematic development diagram of the second electrode of the electrode assembly of Fig. 5.

[0162] Referring to Fig. 7, the first electrode (21) includes a first holding portion (251) on which an active material layer (24) is coated on the surface of a metal foil (23), and a first non-conducting portion (261) on which an active material layer (24) is not coated on one axial side of the metal foil (23). The first non-conducting portion (261) is formed to have a significantly narrower width than the first holding portion (251). The first non-conducting portion (261) is formed to be long along the longitudinal direction of the metal foil (23).

[0163] When the first electrode (21), the second electrode (22), and the separator (28) are wound in a jelly roll shape, the first non-stick portion (261) protrudes axially outward (to one side) from the separator. In the first circumferential section (L1) of the first non-stick portion (261) arranged on the core section (29) side, the first non-stick portion (261) is bent so as to cover the core section (29). That is, the first non-stick portion (261) arranged in the first section (L1) is bent so as to cover the core section (29). The first non-stick portion (261) can be bent radially inward of the core section (29). The first non-stick portion (261) covering the core section (29) of the first section (L1) is directly welded to the electrode terminal section (40). At this time, the first joint (261) can be resistance welded.

[0164] The first non-removable portion (261) covering the core portion (29) of the first section (L1) includes a plurality of first notching tabs (273) that extend in the axial direction, are formed to be spaced apart in the circumferential direction, and are bent to cover one side of the core portion (29). The first notching tabs (271) are defined by first notching grooves (271a) formed therebetween. The plurality of first notching tabs (271, 273) may be bent toward the radial center of the electrode assembly (20). At this time, the plurality of bent first notching tabs (271, 273) may be radially overlapped.

[0165] The axial height (H1) of the first notching tap (273) can be formed to be 0.5 to 1 times the diameter (D) of the core portion (29). When the axial height (H1) of the first notching tap (273) is 0.5 times the diameter (D2) of the core portion (29), the first notching taps (273) facing each other in the diametric direction of the core portion (29) can be bent inward so that their ends meet each other. In addition, when the axial height (H1) of the first notching tap (273) is 1 time the diameter (D2) of the core portion (29), the first notching taps (273) facing each other in the diametric direction of the core portion (29) can cross the core portion (29) with a length approximately equal to the diameter of the core portion (29).

[0166] When the axial height (H1) of the first notching tab (273) is less than 0.5 times the diameter (D) of the core portion (29), the ends of the facing first notching tabs (273) may be spaced apart from each other, thereby forming a hole in the center of the core portion (29). In this case, the welding area between the first notching tabs (273) of the first section (L1) and the electrode terminal portion (40) may be reduced.

[0167] In addition, when the axial height (H1) of the first notching tab (273) exceeds one time the diameter (D) of the core portion (29), the facing first notching tabs (273) may interfere with each other and be bent into a cone shape. In this case, since the first notching tabs (273) of the first section (L1) are bent in a spaced apart or spread state, the weldability of the first notching tabs (273) may be significantly reduced.

[0168] Referring to Fig. 8, the second electrode (22) includes a second holding portion (252) on which an active material layer (24) is coated on the surface of a metal foil (23), and a second non-conductive portion (262) on which an active material layer (24) is not coated on one axial side of the metal foil (23). The second non-conductive portion (262) is formed to have a significantly narrower width than the second holding portion (252). The second non-conductive portion (262) is formed long along the longitudinal direction of the metal foil (33). The second section (L2) of the second electrode (22) of the second non-conductive portion (262) roughly corresponds to the first section (L1) of the first electrode (21), and a second notching tab (272) is not formed on the second non-conductive portion (262) of the second section (L2).

[0169] When the first electrode (21), the second electrode (22), and the separator (28) are wound in a jelly roll shape, the second non-stick portion (262) protrudes axially outward (the other side) from the separator (28). The second non-stick portion (262) is bent to open the core portion (29). That is, the second non-stick portion (262) is bent so as not to cover the core portion (29). For example, since the second non-stick portion (262) does not have a portion that is bent in the second section (L2), even if the second non-stick portion (262) is bent radially inward, the other side of the core portion (29) can be maintained in an open state. For example, the second non-stick portion (262) can be bent radially outward. The second non-conductive portion (262) is welded to the collector plate (50), and thus the collector plate (50) conducts current with the cathode. For example, the second non-conductive portion (262) may be laser welded or resistance welded to the collector plate (50).

[0170] The second non-supporting portion (262) includes a plurality of second notching tabs (272) that extend axially and are spaced apart from each other in the circumferential direction in at least a portion of the outside of the second section (L2). The height (H2) of the second notching tabs (272) may be formed to be the same as or different from the height (H1) of the first notching tabs (271). The second notching tabs (272) are defined by second notching grooves (272a) formed therebetween. The plurality of second notching tabs (272) may be bent radially inward or outward of the electrode assembly (20). The bent plurality of second notching tabs (272) may radially overlap each other radially outward from the core portion (29).

[0171] FIG. 9 is a drawing schematically illustrating a state in which the first notching tabs in the core portion of the electrode assembly of FIG. 5 overlap in the circumferential direction, and FIG. 10 is a drawing schematically illustrating a state in which the first notching tabs in the core portion of the electrode assembly of FIG. 5 overlap in the diametric direction.

[0172] As illustrated in Fig. 9, among the plurality of first notching taps (273), at least a portion of the first notching taps (273) that are adjacent in the circumferential direction can overlap in the axial direction. Accordingly, the adjacent first notching taps (273) can overlap each other without creating a gap in the circumferential direction. Furthermore, the welding area of ​​the first notching taps (27) can be secured to be sufficiently wide.

[0173] As illustrated in Fig. 10, among the plurality of first notching taps (273), at least a portion of the first notching taps (273) facing each other in the diametric direction can overlap each other in the axial direction. Accordingly, the first notching taps (273) facing each other in the diametric direction can overlap each other so that a gap does not form in the center of the core portion (29). Furthermore, the welding area of ​​the first notching taps (273) can be secured sufficiently wide.

[0174] FIG. 11 is a perspective view schematically illustrating a state in which the first notching tabs are bent on one side of the core portion of the electrode assembly of the present invention, FIG. 12 is a cross-sectional view schematically illustrating a state in which one side of the core portion of the electrode assembly of the present invention is covered by the first notching tabs, and FIG. 13 is a cross-sectional view schematically illustrating a state in which the first notching tabs covering the core portion of the electrode assembly of the present invention are welded to the electrode terminal portion.

[0175] Referring to FIGS. 11 to 13, the first notching tabs (273) of the first section (L1) are bent toward the center of the core portion (29) so as to cover one side of the core portion (29). Accordingly, the entire one side of the core portion (29) can be closed by the first notching tabs (273). The first notching tabs (273) covering one side of the core portion (29) form a welding area to be welded to the electrode terminal portion (40).

[0176] In addition, the second notching tabs (272) are bent to open the other side of the core portion (29). Accordingly, the welding rod (100) is inserted through the other side of the core portion (29) and then pressurizes the first notching tabs (273) that are bent to cover the core portion (29). The first notching tabs (273) pressed by the welding rod are brought into close contact with the electrode terminal portion (40) and then directly welded. Accordingly, the positive electrode collector plate previously welded to the first notching tab can be deleted, and the number of welding times can be reduced.

[0177] A method for manufacturing a battery cell according to the present invention configured as described above will be described.

[0178] FIG. 14 is a cross-sectional view schematically illustrating a state in which an electrode terminal portion according to the present invention is pressed into a terminal hole of a can housing, FIG. 15 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, FIG. 16 is a cross-sectional view schematically illustrating a state in which first notched tabs of an electrode assembly according to the present invention are welded to an electrode terminal portion, FIG. 17 is an enlarged view schematically illustrating a state in which first notched tabs of an electrode assembly according to the present invention are welded to an electrode terminal portion, FIG. 18 is a cross-sectional view schematically illustrating a state in which a vent plate and a collector plate are pressed and fixed to the other axial side of a can housing according to the present invention, and FIG. 19 is a flowchart schematically illustrating a method for manufacturing a battery cell according to the present invention.

[0179] Referring to FIGS. 14 to 19, an electrode terminal portion (40) is pressed into a terminal hole (14) formed on one axial side of a can housing (10). At this time, a first gasket (42) is inserted into the peripheral portion of the terminal hole (14) (S11). Then, the electrode terminal portion (40) is inserted into the inside of the terminal hole (14) into which the first gasket (42) is inserted (S12). When the electrode terminal portion (40) is completely inserted into the terminal hole (14), the electrode terminal portion (40) is fixed to the peripheral portion of the terminal hole (14) by being pressed by a tool (S13).

[0180] Next, the electrode assembly (20) is inserted into the can housing (10) (S15). Before the electrode assembly (20) is inserted into the can housing (10), a current collector plate (50) (negative current collector plate) may be welded to the other axial side of the electrode assembly (20). Meanwhile, a positive current collector plate is not provided on one axial side of the electrode assembly (20). In this way, the electrode assembly (20) with the current collector plate (50) welded only to the other axial side is inserted into the can housing (10). At this time, the electrode assembly (20) in a state where the first notching tabs (271, 273) are bent may be inserted.

[0181] Next, a plurality of first notching tabs (273) bent to cover one side of the core portion (29) of the electrode assembly (20) are welded to the electrode terminal portion (40) (S16, S17). To this end, optionally, the can housing (10) may first be turned over so that the opening of the can housing (10) faces upward. Then, a welding rod (10) is inserted into the core portion (29) of the can housing (10), and while pressing the first notching tabs (271) with the welding rod, the first notching tabs (271) are welded to the electrode terminal portion (40). At this time, it is preferable that the welding rod (100) performs resistance welding by applying current to the first notching tabs (273) and the electrode terminal portion (40).

[0182] Next, the edge of the collector plate (50) welded to the axial side of the electrode assembly (20) and the edge of the vent plate (70) are fixed to the end of the can housing (10) by crimping the end of the can housing (10) (S18). To this end, first, using a beading device (not shown), an inwardly recessed beading groove (16) is formed on the opening side of the can housing (10). Then, the edge of the collector plate (50) and the edge of the vent plate (70) are placed on the flat area provided on the side wall member (11) by the beading groove (16). At this time, the vent plate (70) is placed while the second gasket (60) is wrapped around the edge of the vent plate (70). In this state, a crimping device (not shown) is used to crimp the opening side end of the side wall member (11) of the can housing (10) inwardly to form a crimping portion (17). As the crimping portion (17) presses the edges of the collector plate (50) and the vent plate (70) axially inwardly, the edges of the collector plate (50) and the vent plate (70) are fixed to the opening side of the can housing (10).

[0183] The periphery of the above current collector plate (50) is in close contact with the can housing (10) and is electrically connected to the can housing (10). In addition, the edge of the vent plate (70) is electrically insulated from the current collector plate (70) and the side wall member (11) by the second gasket (60).

[0184] 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 in which a receiving portion is formed; An electrode assembly wound in a jelly-roll shape with a separator interposed between the first electrode and the second electrode, and having a core portion formed in the center; and It includes an electrode terminal portion arranged at the axial first end of the can housing; The first electrode includes a first non-coated portion on one axial side of the electrode assembly that is not coated with an active material, The above first non-moving portion protrudes axially outwardly from the separator, In the first circumferential section arranged on the core portion side, the first non-woven portion is bent to cover the core portion, A battery cell, wherein the first bare portion covering the core portion of the first section is welded to the electrode terminal portion.

2. A battery cell in accordance with claim 1, wherein the first non-conductive portion covering the core portion of the first section includes a plurality of first notching tabs extending in the axial direction and spaced apart from each other in the circumferential direction, and bent to cover the core portion.

3. A battery cell in the second paragraph, wherein the axial height of the first notching tab is formed to be 0.5 to 1 times the diameter of the core portion.

4. In the second paragraph, a battery cell, wherein at least a portion of the circumferentially adjacent notching tabs among the plurality of first notching tabs overlap in the axial direction.

5. In the second paragraph, a battery cell, wherein at least a portion of the diametrically facing notching tabs among the plurality of first notching tabs overlap in the axial direction.

6. In the first paragraph, a terminal hole is formed at the axial first end of the can housing, The above electrode terminal portion is pressed into the terminal hole, A battery cell, wherein a first gasket is interposed between the can housing portion around the terminal hole and the electrode terminal portion to electrically insulate the electrode terminal portion and the can housing.

7. Can housing in which the receiving portion is formed; An electrode assembly, which is wound in a jelly-roll shape with a separator interposed between a first electrode and a second electrode, has a core portion formed in the center, and has first notched tabs of the first electrode bent to cover one side of the core portion, and second notched tabs of the second electrode bent to open the other side of the core portion; An electrode terminal portion, which is arranged at the axial first end of the can housing and has first notched tabs bent to cover one side of the core portion, welded thereto; A current collector plate disposed on the axial side of the electrode assembly and welded to the second notching tabs; and A battery cell comprising a vent plate disposed on the axial side of the current collector plate and fixed to the can housing together with the current collector plate.

8. In the 7th paragraph, the first electrode includes a first non-coated portion on one axial side of the electrode assembly that is not coated with an active material, In the above first non-removable portion, a plurality of first notched tabs are formed that protrude axially outwardly from the separator, In the first circumferential section of the first non-reinforced portion arranged on one side of the core portion, a plurality of first notching tabs of the first section are bent to cover the core portion, A battery cell in which the first notching tabs covering one side of the core portion of the first section are welded to the electrode terminal portion.

9. A battery cell in accordance with claim 8, wherein the axial height of the first notching tab is formed to be 0.5 to 1 times the diameter of the core portion.

10. In the 8th paragraph, a battery cell, wherein at least a portion of the circumferentially adjacent first notching tabs among the plurality of first notching tabs overlap in the axial direction.

11. In the 10th paragraph, a battery cell, wherein at least a portion of the first notching tabs facing each other in the radial direction among the plurality of first notching tabs overlap in the axial direction.

12. In the 8th paragraph, a terminal hole is formed at the axial first end of the can housing, The above electrode terminal portion is pressed into the terminal hole, A battery cell, wherein a first gasket is interposed between the can housing portion around the terminal hole and the electrode terminal portion to electrically insulate the electrode terminal portion and the can housing.

13. In the 8th paragraph, the periphery of the collector plate and the periphery of the vent plate are pressed against the crimping portion of the can housing, The above-mentioned current collector plate is a battery cell electrically connected to the can housing.

14. In the 13th paragraph, the peripheral portion of the collector plate is in close contact with the can housing, A battery cell, wherein a second gasket is interposed between the current collector plate and the vent plate, and between the vent plate and the crimping portion, to electrically insulate the vent plate and the can housing.

15. Terminal installation step in which an electrode terminal is installed in a terminal hole formed on one axial side of the can housing; An insertion step in which an electrode assembly is inserted into the inside of the can housing; A welding step of welding a plurality of first notched tabs bent to cover one side of the core portion of the electrode assembly to the electrode terminal portion; and A method for manufacturing a battery cell, comprising a fixing step of fixing a current collector plate and a vent plate welded to the axial opposite side of the electrode assembly to the opposite side of the can housing.

16. In the 15th paragraph, the terminal installation step is: Step of inserting the first gasket into the periphery of the terminal hole: A step of inserting the electrode terminal portion into the inside of the terminal hole; and A method for manufacturing a battery cell, comprising: a step of pressing the electrode terminal portion and fixing it to the periphery of the terminal hole.

17. In the 15th paragraph, in the insertion step, A method for manufacturing a battery cell, wherein the electrode assembly, with the above-mentioned current collector plate welded to the axial side, is inserted into the inside of the can housing.

18. In the 15th paragraph, the welding step, A step of turning over the can housing so that the opening of the can housing faces upward; and A method for manufacturing a battery cell, comprising: a step of inserting a welding rod into a core portion of the can housing and welding the first notching tab to the electrode terminal portion.

19. In the 15th paragraph, in the fixing step, The periphery of the above collector plate and the periphery of the above vent plate are pressed against the crimping portion of the above can housing, A method for manufacturing a battery cell, wherein the above-mentioned current collector plate is electrically connected to the above-mentioned can housing.

20. In paragraph 19, the peripheral portion of the collector plate is in close contact with the can housing, A method for manufacturing a battery cell, wherein a second gasket is interposed between the current collector plate and the vent plate, and between the current collector plate and the crimping portion, so that the vent plate is electrically insulated from the can housing.

Images