Battery cell, and battery pack and vehicle including the same

Abstract

The present invention relates to a battery cell comprising: an electrode assembly wherein a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode are wound around a winding shaft; a housing which accommodates the electrode assembly through an opening formed on one side, has a closure formed on the other side, and is configured to be electrically connected to the second electrode; and a cover assembly configured to cover the opening of the housing, the cover assembly comprising a cover having a first hole, a terminal at least partially inserted into the first hole and configured to be coupled to the first electrode, and an insulating gasket disposed between the cover and the terminal.

Description

Technical Field

[0001] This disclosure relates to battery cells, battery packs including such battery cells, and vehicles.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0183984, filed with the Korean Intellectual Property Office on December 11, 2024, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0003] Secondary batteries, offering high applicability across product categories and possessing electrical properties such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. Such secondary batteries are gaining attention as a new energy source for enhancing environmental sustainability and energy efficiency, not only because of their major advantage of significantly reducing fossil fuel use but also because they do not produce byproducts from energy use.

[0004] Battery packs can be configured by connecting multiple battery cells in series or parallel according to the required charge / discharge capacity of an EV or HEV. In this case, a common method for configuring a battery pack is performed by configuring a battery module including at least one battery cell, and then adding other components to the at least one battery module. Alternatively, battery packs have recently been manufactured in a cell-to-pack type where multiple battery cells are directly housed in the battery pack housing without being modularized.

[0005] Demand for metal-can battery cells for vehicle battery packs is increasing. The metal cans can be square or cylindrical. Cylindrical battery cells have a structure in which a wound-core electrode assembly, constructed by winding a laminate including a first electrode, a second electrode, and a separator around a winding shaft to have a central hole in the core, is housed within a cylindrical can. Cylindrical battery cells offer greater impact resistance and temperature resistance than pouch-type battery cells.

[0006] In a conventional cylindrical battery cell, the first electrode of the electrode assembly is electrically connected to the casing. Conventional battery cells include riveted terminals because the terminals electrically connected to the second electrode of the electrode assembly are riveted into through-holes formed in the closed surface of the casing.

[0007] In this configuration, the riveting terminals and electrode assemblies are joined together by ultrasonic welding performed inside the housing using an ultrasonic welding rod inserted through an opening in the housing into the central hole of the electrode assembly.

[0008] However, conventional ultrasonic welding suffers from the problem of damage to the diaphragm of the electrode assembly due to spatter generated during ultrasonic welding. Furthermore, it is difficult to reduce the diameter of the ultrasonic welding rod, but the center hole of the electrode assembly must have a certain size or be larger, thus limiting the ability to increase the energy density of the electrode assembly.

[0009] Furthermore, the presence of riveting terminals and insulators inside the housing to insulate the housing and the second electrode limits the ability to increase the vertical volume of the electrode assembly.

[0010] Furthermore, the different and complex components inside the casing, as well as the complex processes involved in manufacturing conventional battery cells, present challenges in improving productivity and reducing costs.

[0011] As mentioned above, there is a need for a method to simplify the connection process between components in order to improve productivity and manufacturability and increase the energy density of battery cells. Summary of the Invention

[0012] Technical issues

[0013] This disclosure is designed to solve problems in related technologies, and therefore relates to providing a battery cell that can improve productivity and processability in battery cell manufacturing and increase the energy density of the battery cell, as well as a battery pack and a vehicle including the battery cell.

[0014] However, the technical problems that this disclosure seeks to solve are not limited to those described above, and those skilled in the art will clearly understand from the description of the invention below that there are other problems not mentioned above.

[0015] Technical solution

[0016] In one aspect of this disclosure, a battery cell is provided, the battery cell comprising: an electrode assembly including a first electrode, a second electrode wound around a winding shaft, and a separator inserted between the first electrode and the second electrode; a housing configured to receive the electrode assembly through an opening formed on one side and electrically connected to the second electrode, and having a closure formed on the other side; and a cover assembly configured to cover the opening of the housing and including a cover having a first hole, a terminal configured to be at least partially inserted into the first hole and coupled to the first electrode, and an insulating gasket disposed between the cover and the terminal.

[0017] The cover assembly can be configured to be circumferentially connected along the sidewall of the housing.

[0018] The cover can be configured to be spaced apart from the electrode assembly.

[0019] The cover may include a vent, which is configured to rupture and release gas generated within the housing when the internal pressure of the housing exceeds a certain level.

[0020] The terminal may include a flat portion having an inner surface formed in the shape of a flat plate.

[0021] The terminal may include a mounting portion configured to protrude radially outward from the outer surface of the flat portion, such that the insulating washer is mounted on the mounting portion.

[0022] The terminal may include a protrusion configured to project vertically outward from the outer surface of the flat portion.

[0023] The end of the protrusion can be configured to be bent outward in the radial direction.

[0024] The insulating gasket can be configured to surround the inner circumferential surface of the cover.

[0025] The terminal may have a first recess, which is configured such that at least a portion of the terminal is recessed inward and connected to the first electrode.

[0026] The terminal may have a first weld bead formed on the outer surface of the first recess when it is welded to the first electrode.

[0027] The terminal may have a second hole formed therein.

[0028] The battery cell according to an embodiment of the present disclosure may further include a plug configured to be inserted into the second hole.

[0029] The plug may have a stepped shape.

[0030] The second weld can be formed along the edge of the second hole and the edge of the outer surface of the plug.

[0031] The edge of the outer surface of the plug can be configured to be recessed inward.

[0032] The housing may have a second recess that is at least partially recessed inward from the outer surface of the closure and configured to be connected to the second electrode.

[0033] The housing may have a third weld bead formed on the outer surface of the second recess when welded to the second electrode.

[0034] Furthermore, this disclosure provides a battery pack comprising a plurality of battery cells according to an embodiment of this disclosure.

[0035] Furthermore, this disclosure relates to a vehicle including a battery pack according to an embodiment of this disclosure.

[0036] Furthermore, this disclosure also provides a method for manufacturing a battery cell, the method comprising the following steps: winding an electrode assembly having a first electrode, a second electrode, and a separator inserted between the first electrode and the second electrode stacked around a winding shaft; mounting a cover assembly on one side surface of the electrode assembly; welding the terminals of the cover assembly to an uncoated portion of the first electrode; inserting the electrode assembly into a housing having an opening on one side; welding the sidewall of the housing to the outer peripheral surface of the cover assembly; injecting electrolyte through a second hole in the cover assembly; and inserting and connecting a plug to the second hole.

[0037] In addition, the method for manufacturing a battery cell according to an embodiment of the present disclosure may further include a step of welding a closed portion formed on the other side of the casing to an uncoated portion of the second electrode.

[0038] Furthermore, the method for manufacturing a battery cell according to an embodiment of the present disclosure may also include a cover assembly step, which includes the following steps: mounting an insulating gasket on the terminal; mounting a cover on the insulating gasket; and crimping the terminal and the insulating gasket.

[0039] Beneficial effects

[0040] According to one aspect of this disclosure, the process can be simplified by the connection structure of the components of the cover assembly of the battery cell, thereby reducing costs and increasing productivity.

[0041] Furthermore, according to another aspect of this disclosure, protruding riveted terminals and insulators inside the casing of conventional battery cells can be eliminated, thereby increasing the vertical height of the electrode assembly. This improves the energy density of the battery cell.

[0042] Furthermore, according to another aspect of this disclosure, the first electrode and / or the second electrode do not require a current collector plate for current collection. This reduces component costs and simplifies the manufacturing process.

[0043] Furthermore, according to the above aspects of this disclosure, since the terminals are directly welded to the electrode assembly from the outside of the battery cell, the welding area can be maximized compared to conventional battery cells.

[0044] Furthermore, according to another aspect of this disclosure, the configuration of welding the terminals and electrode assemblies from the outside of the battery cell prevents welding spatter generated during welding from entering the interior of the battery cell, thereby solving problems associated with separator damage in the electrode assembly and reduced battery capacity and life.

[0045] Furthermore, according to the above aspects of this disclosure, since the welding tip does not need to be inserted into the interior of the electrode assembly, the diameter of the central hole in the electrode assembly can be reduced. This increases the energy density of the battery cell.

[0046] In addition, this disclosure may have various other effects, and these effects will be described in various embodiments, or descriptions of effects that can be readily deduced by those skilled in the art will be omitted. Attached Figure Description

[0047] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, serve to provide a further understanding of the technical features of the present disclosure. Therefore, the present disclosure is not to be construed as limited to the drawings.

[0048] Figure 1 This is an overall perspective view of a battery cell according to an embodiment of the present disclosure.

[0049] Figure 2 This is a longitudinal cross-sectional view of a battery cell according to an embodiment of the present disclosure.

[0050] Figure 3 This is a perspective view of a cover assembly included in a battery cell according to an embodiment of the present disclosure.

[0051] Figure 4 This is an exploded perspective view of a cover assembly included in a battery cell according to an embodiment of the present disclosure.

[0052] Figure 5 This is a cross-sectional view of a cover assembly included in a battery cell prior to the pressing process, according to an embodiment of the present disclosure.

[0053] Figure 6 This is an exploded cross-sectional view of a component of a cover assembly included in a battery cell according to an embodiment of the present disclosure.

[0054] Figure 7 This is a cross-sectional view of a cover assembly included in a battery cell after a pressing process, according to an embodiment of the present disclosure.

[0055] Figure 8 This is a cross-sectional view showing the upper part of a battery cell according to an embodiment of the present disclosure.

[0056] Figure 9 This is a perspective view showing the upper part of a battery cell according to an embodiment of the present disclosure.

[0057] Figure 10 This is a perspective view of a plug included in a battery cell according to an embodiment of the present disclosure.

[0058] Figure 11This is a cross-sectional view of the plug of a battery cell removed from the cover assembly according to an embodiment of the present disclosure.

[0059] Figure 12 This is a cross-sectional view of a plug for connecting a battery cell to a cover assembly according to an embodiment of the present disclosure.

[0060] Figure 13 This is a perspective view showing the lower part of a battery cell according to an embodiment of the present disclosure.

[0061] Figure 14 This is a cross-sectional view showing the lower part of a battery cell according to an embodiment of the present disclosure.

[0062] Figure 15 This is a bottom plan view of a battery cell according to an embodiment of the present disclosure.

[0063] Figure 16 This is a schematic perspective view of a battery pack according to an embodiment of the present disclosure.

[0064] Figure 17 This is a schematic perspective view of a vehicle according to an embodiment of the present disclosure.

[0065] Figure 18 This is a schematic diagram illustrating the manufacturing process of a battery cell according to one embodiment of the present disclosure.

[0066] Figure 19 This is a schematic diagram illustrating the manufacturing process of a battery cell according to another embodiment of the present disclosure.

[0067] Figure 20 This is a schematic diagram illustrating a portion of the manufacturing process of a battery cell according to another embodiment of the present disclosure. Detailed Implementation

[0068] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general and dictionary meaning, but rather interpreted based on the meanings and concepts corresponding to the technical aspects of the present disclosure, on the basis of the principle that allows the inventors to appropriately define the terminology for the best interpretation.

[0069] Therefore, the description presented herein is merely a preferred example for illustrative purposes and does not represent the full scope of this disclosure. It should be understood that other equivalents and modifications may be made thereto without departing from the scope of this disclosure.

[0070] Furthermore, this disclosure may include various embodiments. Redundant descriptions of substantially identical or similar configurations will be omitted from the various embodiments, and descriptions will be based on the differences between them.

[0071] Furthermore, although directional terms such as up, down, left, right, forward, and backward are used in this specification, it will be apparent to those skilled in the art to which this disclosure pertains that these terms are merely for the convenience of interpretation with reference to the accompanying drawings and may vary depending on the position, arrangement, or rotation of the target object or the position of the observer.

[0072] For ease of explanation, the length direction of the winding axis of the electrode assembly wound in the form of a core in this specification will be referred to as the vertical direction (which may be indicated by the Z-axis direction in the accompanying drawings). Furthermore, the direction around the winding axis will be referred to as the circumferential direction. Additionally, the direction approaching or away from the winding axis will be referred to as the radial direction (which may be indicated by the X-axis or Y-axis direction in the accompanying drawings).

[0073] Figure 1 This is an overall perspective view of a battery cell according to an embodiment of the present disclosure, and Figure 2 This is a longitudinal cross-sectional view of a battery cell according to an embodiment of this disclosure. Furthermore, Figure 3 This is a perspective view of a cover assembly included in a battery cell according to an embodiment of the present disclosure, and Figure 4 This is an exploded perspective view of a cover assembly included in a battery cell according to an embodiment of the present disclosure.

[0074] Reference Figures 1 to 4 According to embodiments of the present disclosure, the battery cell 10 may include an electrode assembly 100, a housing 200, and a cover assembly 300. The battery cell 10 may be a rechargeable and dischargeable secondary battery. The battery cell 10 may be, for example, a cylindrical battery.

[0075] Preferably, the battery cell 10 can be a cylindrical secondary battery having a shape factor ratio (height to diameter ratio) greater than about 0.4. Preferably, the diameter of the battery cell 10 can be 40 mm to 50 mm, and the height can be 60 mm to 130 mm. The shape factor of the battery cell 10 can be, for example, 46110, 4875, 48110, 4880, or 4680.

[0076] The electrode assembly 100 may include a first electrode 110 having a first polarity, a second electrode 120 having a second polarity opposite to the first polarity, and a diaphragm inserted between the first electrode 110 and the second electrode 120.

[0077] The electrode assembly 100 may have a structure in which a first electrode 110, a second electrode 120 and a laminate of a diaphragm are wound around a winding axis in one direction (winding direction).

[0078] The first electrode 110 and / or the second electrode 120 may be configured in sheet form. The first electrode 110 and / or the second electrode 120 may include a current collector made of metal foil. The metal foil may be appropriately selected according to the polarity of the first electrode 110 and / or the second electrode 120.

[0079] Furthermore, the first electrode 110 and / or the second electrode 120 may include at least a portion coated with an electrode active material. Additionally, a portion of the first electrode 110 and / or the second electrode 120 may be an uncoated portion without electrode active material. The first electrode 110 and / or the second electrode 120 may each include a first uncoated portion 110a and / or a second uncoated portion 120a. These uncoated portions 110a and 120a may be disposed at the longitudinal ends of the first electrode 110 and / or the second electrode 120 in the winding direction. Furthermore, the uncoated portions 110a and 120a may be configured to be exposed to the outside of the diaphragm. At least a portion of the uncoated portions 110a and 120a may serve as the electrode tab itself.

[0080] The first electrode 110 and the second electrode 120 may have opposite polarities. This disclosure will be described based on an embodiment in which the first electrode 110 is the positive electrode and the second electrode 120 is the negative electrode.

[0081] The membrane can be configured as a single or multiple porous polymer membranes made of, for example, polyolefin-based polymers such as ethylene homopolymers, propylene homopolymers, ethylene / butene copolymers, ethylene / hexene copolymers, or ethylene / methacrylate copolymers. As another example, the membrane can be a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fiber or polyethylene terephthalate fiber.

[0082] The housing 200 can be configured to receive the electrode assembly 100 through an opening formed on one side thereon. The housing 200 may include a closure 200b formed on the opposite side of the opening. In this embodiment, the opening may be formed on the upper side of the housing 200 (in the +Z axis direction), and the closure 200b may be formed on the lower side of the housing 200 (in the -Z axis direction).

[0083] The housing 200 can be configured as a cylindrical shape with one side open. More specifically, the housing 200 may include a sidewall 200a. The sidewall 200a can be configured to surround the outer periphery of the electrode assembly 100. An opening in the housing 200 can be formed by the sidewall 200a. The sidewall 200a can be configured to extend upward from the closure portion 200b.

[0084] Furthermore, the housing 200 may include a conductive metal. The housing 200 may be configured to be electrically connected to a second electrode 120 of the electrode assembly 100. In this case, the housing 200 may serve as a second terminal of the battery cell 10.

[0085] The cover assembly 300 can be configured to cover an opening in the housing 200. The cover assembly 300 can be configured to have, for example, a generally plate-like shape. The cover assembly 300 can be coupled to the opening in the housing 200. For example, the cover assembly 300 can be positioned on the upper edge of the opening in the housing 200.

[0086] Specifically, the cover assembly 300 may include a cover 310, a terminal 320, and an insulating washer 330.

[0087] The cover 310 can be configured to have a substantially plate-like shape. The outer periphery of the cover 310 can be attached to the upper edge of the opening in the housing 200. Furthermore, the cover 310 can include a conductive metal. For example, the cover 310 can be made of SUS. Therefore, the cover 310 can be configured to be electrically connected to the second electrode 120.

[0088] The cover 310 may include a first hole H1. The first hole H1 may be formed by perforating a portion of the cover 310.

[0089] Terminal 320 can be configured to be at least partially inserted into the first hole H1. Furthermore, terminal 320 may include a conductive metal. For example, terminal 320 may be made of aluminum or an aluminum alloy (Al 1100). Terminal 320 can be configured to be electrically connected to the first electrode 110. Additionally, terminal 320 can be configured to be coupled to the first electrode 110. Specifically, terminal 320 can be coupled to the first uncoated portion 110a of the first electrode 110. In this case, terminal 320 can serve as the first terminal of the battery cell 10.

[0090] An insulating gasket 330 can be inserted between the cover 310 and the terminal 320. The insulating gasket 330 can be disposed within the first hole H1. The insulating gasket 330 can be made of an electrically insulating material, such as silicone resin. The insulating gasket 330 can be made of PBT. PBT is preferred because it is electrically insulating, inexpensive, and does not react with the electrolyte. According to the above-described embodiment of this disclosure, the presence of the insulating gasket 330 can improve the sealing performance of the housing 200.

[0091] When assembling the cover assembly 300, an insulating washer 330 can be placed on the terminal 320, and the cover 310 can be placed on the insulating washer 330, thereby forming the cover assembly 300. In this case, the insulating washer 330 can be disposed between the cover 310 and the terminal 320, thereby insulating the cover 310 and the terminal 320, which have different polarities.

[0092] In other words, the terminal 320 with the first polarity and the cover 310 with the second polarity can be kept electrically insulated by the insulating washer 330. Therefore, the terminal 320 can be used as the first terminal, and the remaining area of ​​the cover assembly 300 (excluding the area occupied by the terminal 320) can be used as the second terminal.

[0093] Therefore, according to the battery cell 10 of this disclosure, multiple battery cells 10 can be electrically connected so that the positive and negative electrodes are connected in one direction, thereby simplifying the electrical connection structure.

[0094] Furthermore, according to the above-described embodiments of this disclosure, the cover 310, terminal 320, and insulating gasket 330 can be pre-assembled to manufacture the cover assembly 300, which can then be connected to the housing 200, thereby simplifying the manufacturing process of the battery cell 10 to reduce costs and increase productivity.

[0095] The cover assembly 300 can be configured such that its inner surface rests on the upper edge of the side wall 200a of the housing 200. In this case, the cover assembly 300 can be configured to be circumferentially joined along the side wall 200a of the housing 200. That is, the connection can be performed at the contact point between the edge of the outer surface of the housing 200 and the edge of the inner surface of the cover assembly 300. For example, the edges of the outer surface of the housing 200 and the inner surface of the cover assembly 300 can be joined by welding. In this case, the welded portion ( Figure 1 Part A) can be positioned along the outer periphery of the upper edge of the housing 200.

[0096] The housing 200 and the cover assembly 300 can be joined by methods other than welding, and the joining methods are not limited to these.

[0097] In the following text, except Figure 4 In addition, it will also refer to Figure 5 and Figure 6 The various components of the cover assembly 300 are described in more detail.

[0098] Figure 5 This is a cross-sectional view of a cover assembly included in a battery cell prior to the pressing process, according to an embodiment of this disclosure. Figure 6 This is an exploded cross-sectional view of a component of a cover assembly included in a battery cell according to an embodiment of the present disclosure.

[0099] As described above, when assembling the cover assembly 300, the insulating washer 330 can be placed on the terminal 320, and the cover 310 can be placed on the insulating washer 330, thereby forming the cover assembly 300. In this case, the insulating washer 330 can be disposed between the cover 310 and the terminal 320 to insulate the cover 310 and the terminal 320, which have different polarities, from each other.

[0100] More specifically, refer to Figures 4 to 6 The cover 310 can essentially have the shape of a plate. A first hole H1 can be formed in the center of the cover 310. That is, the cover 310 can be configured as an annular plate. The cover 310 can be configured to extend extensively in the horizontal direction (e.g., in a direction parallel to the XY plane in the figure).

[0101] In addition, the cover 310 may include an exhaust 311. The exhaust 311 may be configured to rupture when the internal pressure of the housing 200 exceeds a certain level, thereby venting the gas generated within the housing 200.

[0102] The exhaust section 311 may be a structurally weaker region than the surrounding area, making it prone to rupture when internal pressure is applied. The exhaust section 311 may, for example, be a region with a thinner thickness than the surrounding area. (See reference...) Figure 6 As shown in the other accompanying drawings, the vent 311 can be formed into a generally circular closed loop. The vent 311 can be configured, for example, as a groove formed on one side of the cover 310 by slotting one side of the cover 310.

[0103] According to the embodiments described above in this disclosure, when the internal pressure of the housing 200 increases above a reference value due to a thermal event or other reasons, the vent 311 can rupture to separate a portion of the cover assembly 300 from the housing 200, thereby allowing the release of high-temperature heat and pressure through the opening. For example, based on a 4680 battery cell, the cut depth of the vent 311 can be designed such that the vent 311 ruptures under an internal pressure of approximately 25 bar or higher.

[0104] In addition, refer to Figures 4 to 6 Terminal 320 may be substantially configured in the shape of a plate. Terminal 320 may include a flat portion 321. Flat portion 321 may be substantially in the shape of a plate. Flat portion 321 may be configured to have a flat inner surface. Flat portion 321 may be configured to extend extensively in the horizontal direction. Flat portion 321 may be configured to be disposed on electrode assembly 100.

[0105] Furthermore, terminal 320 may include a mounting portion 322. The mounting portion 322 may be configured to project radially outward from the outer surface of the flat portion 321. That is, the mounting portion 322 may be configured to extend radially from the outer surface of the flat portion 321. The mounting portion 322 may be configured such that an insulating washer 330 is mounted thereon.

[0106] Furthermore, terminal 320 may include a protrusion 323. The protrusion 323 may be configured to project vertically from the outer surface of flat portion 321. That is, the protrusion 323 may be configured to extend vertically from the outer surface of flat portion 321. The protrusion 323 may be configured to be substantially perpendicular to the mounting portion 322. The protrusion 323 may be configured as a substantially circular closed loop.

[0107] The protrusion 323 can be configured to support the insulating washer 330 on its outer surface. That is, the inner surface of the insulating washer 330 can be configured to be supported by the mounting portion 322 and the protrusion 323. Therefore, the insulating washer 330 and the terminal 320 can be in close contact with each other, thereby further enhancing the sealing performance of the insulating washer 330.

[0108] Reference Figures 4 to 6 The insulating washer 330 can be configured as an annular ring. The insulating washer 330 can be configured to have a shape corresponding to the sidewall along its outer periphery.

[0109] As a more specific example, the insulating washer 330 may include a horizontal portion 331 and a vertical portion 332. The horizontal portion 331 and the vertical portion 332 may be configured to be substantially perpendicular to each other. The horizontal portion 331 may be configured to extend in the radial direction. The horizontal portion 331 may be configured to rest on the mounting portion 322 of the terminal 320. Furthermore, the horizontal portion 331 may be configured such that a cover 310 is mounted thereon.

[0110] The vertical portion 332 can be configured to extend in the vertical direction. The vertical portion 332 can be configured to form the sidewall of the insulating washer 330. The inner peripheral surface of the vertical portion 332 can be configured to be supported by the protrusion 323 of the terminal 320. Furthermore, the cross-sectional area of ​​the inner peripheral surface of the vertical portion 332 can be configured to substantially correspond to the entire cross-sectional area of ​​the terminal 320.

[0111] According to an embodiment of the cover assembly 300 of this disclosure, the terminal 320 may be configured such that at least a portion thereof is inserted into the first hole H1, such that the insulating washer 330 and the cover 310 are disposed on the placement portion 322. In this case, the terminal 320 may be configured to protrude further outward than the cover 310. The terminal 320 may be disposed on the outermost side of the cover assembly 300.

[0112] According to the above-described embodiment of this disclosure, terminal 320 can be connected to the first electrode 110 of electrode assembly 100 without being riveted to the first hole H1 of cover 310, while being exposed to the outside of cover assembly 300. Therefore, when connecting terminal 320, the riveting process can be eliminated, thereby simplifying the manufacturing process of battery cell 10 to reduce costs and increase productivity.

[0113] According to the above-described embodiment of this disclosure, the inward protrusion can be minimized compared to when the terminal 320 is riveted to the first hole H1. Therefore, the vertical height of the electrode assembly 100 can be increased, thereby improving the energy density of the battery cell 10.

[0114] Furthermore, according to the structure of the cover assembly 300, the terminal 320 can be configured to protrude further inward than the cover 310. Therefore, the cover 310 can be naturally configured to be spaced apart from the electrode assembly 100. Thus, the cover 310 and the first electrode 110, which have different polarities, can be physically separated, thereby stably maintaining an electrically insulating state.

[0115] In other words, according to the above-described embodiment of this disclosure, even without a separate insulator, the cover 310 and the first electrode 110, which have different polarities, can be electrically insulated from each other. This allows the insulator to be removed, thereby increasing the vertical height of the electrode assembly 100. This can increase the energy density of the battery cell 10. Furthermore, the elimination of components can reduce costs and increase productivity.

[0116] Figure 7 This is a cross-sectional view of a cover assembly included in a battery cell after a pressing process, according to an embodiment of the present disclosure.

[0117] During the manufacturing process of the battery cell 10 disclosed herein, a pressing process for the cover assembly 300 can be performed. That is, after assembling the corresponding components of the cover assembly 300, the cover assembly 300 can be configured to be pressed by a pressing device.

[0118] The crimping device can be moved vertically from the outside to the inside of the cover assembly 300 to crimp the end of the protrusion 323 of the terminal 320 and the end of the vertical portion 332 of the insulating washer 330 (see...). Figure 7 Part B in the text.

[0119] Therefore, as Figure 7 As disclosed in the illustrated embodiment, the end of the protrusion 323 can be bent outward in the radial direction. That is, the vertical protrusion 323 of the terminal 320 can be pressed by the crimping device and thus deformed outward in the radial direction to an inclined state at a predetermined angle.

[0120] The vertical portion 332 of the insulating washer 330 can also be configured to be bent outward in the radial direction. That is, the vertical portion 332 of the insulating washer 330 in the vertical state can be pressed by the crimping device and thus deformed outward in the radial direction to an inclined state at a predetermined angle.

[0121] Therefore, the insulating washer 330 can be configured to surround the inner peripheral surface of the cover 310. That is, the insulating washer 330 can be configured to contact both the inner and outer surfaces of the cover 310, and simultaneously contact the inner peripheral surface of the first hole H1.

[0122] According to the above embodiments of this disclosure, the fixing strength of the insulating gasket 330 can be improved through a simple structure. Therefore, even when an external impact is applied to the battery cell 10 or pressure is applied due to a thermal event, the insulating gasket 330 can be prevented from detaching between the cover 310 and the terminal 320. Thus, electrical insulation between the terminals 320 and the cover 310, which have different polarities, can be stably maintained.

[0123] Furthermore, according to the above-described embodiment of this disclosure, the fixing strength of the terminal 320 can be improved through a simple structure. Therefore, even when an external impact is applied to the battery cell 10 or pressure is applied due to a thermal event, separation of the terminal 320 from the cover 310 can be prevented. In addition, the sealing performance of the housing 200 can be improved.

[0124] Figure 8 This is a cross-sectional view showing the upper part of a battery cell according to an embodiment of the present disclosure, and Figure 9 This is a perspective view showing the upper part of a battery cell according to an embodiment of the present disclosure.

[0125] Reference Figure 8 and Figure 9 Terminal 320 may include a first recess G1. The first recess G1 may be formed on the outer surface of the flat portion 321. The first recess G1 may be configured such that at least a portion of the outer surface of terminal 320 is recessed inward. A plurality of first recesses G1 may be provided. The plurality of first recesses G1 may be configured to be spaced apart from each other in a circumferential direction. The first recesses G1 may be configured to be connected to the first electrode 110.

[0126] Terminal 320 can be connected to the first electrode 110 by laser welding. Specifically, terminal 320 and the first uncoated portion 110a can be connected by laser welding. Therefore, terminal 320 may include a first weld bead W1. When terminal 320 and the first uncoated portion 110a are connected, a first weld bead W1 can be formed. The first weld bead W1 can be a weld bead formed by laser welding or the like.

[0127] Specifically, in embodiments of this disclosure, due to the structure of the cover assembly 300 and the terminal 320, a laser beam can be irradiated from the outside of the terminal 320 to connect the terminal 320 and the first electrode 110. Therefore, a first weld bead W1 can be provided on the outer side of the terminal 320. Specifically, the first weld bead W1 can be formed on the outer surface of the first recess G1.

[0128] For example, such as Figure 9 As disclosed in the illustrated embodiment, the first weld bead W1 can be formed in the radial direction. However, the shape of the first weld bead W1 is merely exemplary, and the first weld bead W1 can be formed in other shapes.

[0129] According to the above-described embodiment of this disclosure, since the terminal 320 and the first electrode 110 can be laser-welded to the outside of the battery cell 10, spatter is prevented from entering the interior of the battery cell 10 even when spatter is generated during welding. Therefore, damage to the separator of the electrode assembly 100 can be minimized, the risk of low voltage generation can be reduced, and the lifespan of the battery cell 10 can be increased.

[0130] Furthermore, according to the above-described embodiment of this disclosure, when welding the terminal 320, the process of inserting the ultrasonic welding rod into the central hole of the electrode assembly 100 can be omitted, thereby reducing the diameter of the central hole of the electrode assembly 100. This can increase the capacity of the battery cell 10 and improve its energy density.

[0131] Furthermore, according to the above-described embodiment of this disclosure, a current collector is not required on the first uncoated portion 110a of the first electrode 110. This reduces component costs and simplifies the manufacturing process.

[0132] Furthermore, according to the above-described embodiment of this disclosure, the terminal 320 can be directly soldered to the first electrode 110 outside the battery cell 10, maximizing the soldering area compared to conventional battery cells. This wide soldering area ensures low resistance, which is beneficial for fast charging.

[0133] Figure 10 This is a perspective view of a plug included in a battery cell according to an embodiment of the present disclosure. Figure 11 This is a cross-sectional view of the plug of a battery cell removed from the cover assembly according to an embodiment of the present disclosure, and Figure 12 This is a cross-sectional view of a plug for connecting a battery cell to a cover assembly according to an embodiment of the present disclosure.

[0134] The second hole H2 can be formed in the terminal 320. The second hole H2 can be formed in the flat portion 321. The second hole H2 can be formed through the flat portion 321. The second hole H2 can be formed substantially in the center of the terminal 320. The second hole H2 can be positioned to correspond to the center hole formed in the core of the electrode assembly 100.

[0135] The second hole H2 can be configured to allow electrolyte to be injected into the electrode assembly 100. After the cover assembly 300 is attached to the electrode assembly 100, the electrode assembly 100 can be inserted into the housing 200, and then electrolyte can be injected through the second hole H2 of the terminal 320. The electrolyte can pass through the second hole H2 and move into the interior of the electrode assembly 100.

[0136] Reference Figures 10 to 12 The battery cell 10 according to an embodiment of the present disclosure may further include a plug 400. The plug 400 may be configured to be inserted into the second hole H2. After electrolyte is injected through the second hole H2, the plug 400 may be inserted into the second hole H2.

[0137] The plug 400 can be configured to be inserted into the second hole H2 such that its outer surface is exposed to the outside of the terminal 320. The plug 400 can be configured to be electrically connected to external components of the battery cell 10, such as a busbar, through the exposed portion.

[0138] The plug 400 can be positioned to correspond to a central hole formed in the core of the electrode assembly 100. Additionally, the outer surface of the plug 400 can be configured to be substantially flush with the outer surface of the terminal 320. The inner surface of the plug 400 can be configured to be substantially flush with the inner surface of the terminal 320.

[0139] The plug 400 can be configured in a cylindrical shape. The plug 400 can be configured to have a shape corresponding to the second hole H2. The cross-sectional area of ​​the plug 400 can be configured to substantially correspond to the cross-sectional area of ​​the second hole H2 of the terminal 320. Therefore, the outer surface of the plug 400 can be configured to be supported by the inner surface of the second hole H2.

[0140] The plug 400 can be configured to be disposed on the terminal 320. For example, as in Figure 10 As disclosed in the illustrated embodiment, the plug 400 can be configured in a stepped form. Specifically, the plug 400 may include a first portion 410 and a second portion 420. The first portion 410 may be configured to rest on the terminal 320. The edge of the second hole H2 of the terminal 320 may be configured to be recessed inward. The first portion 410 may rest on the recess of the terminal 320.

[0141] The second part 420 can be configured to be fully inserted into the second hole H2. The cross-sectional area of ​​the second part 420 can be smaller than the cross-sectional area of ​​the first part 410.

[0142] According to the above-described embodiment of this disclosure, the plug 400 can be stably inserted into and fixed to the terminal 320 by means of the simple structure of the plug 400.

[0143] Reference Figure 12The plug 400 can be configured to be coupled to the terminal 320. For example, the plug 400 can be coupled to the terminal 320 by soldering. Therefore, the plug 400 can have the same first polarity as the terminal 320.

[0144] The plug 400 may have a second weld bead W2 formed thereon. The second weld bead W2 may be formed when the terminal 320 and the plug 400 are connected. The second weld bead W2 may be formed by laser welding or the like.

[0145] Specifically, in embodiments of this disclosure, a laser beam can be irradiated from the outside of the cover assembly 300 and the plug 400 to connect the terminal 320 and the plug 400. Therefore, a second weld bead W2 can be provided on the outer side of the plug 400. Specifically, the second weld bead W2 can be formed along the edge of the second hole H2 and the edge of the outer surface of the plug 400. For example, the second weld bead W2 can be formed substantially in a circular closed-loop shape.

[0146] According to the above-described embodiment, weldability can be improved by laser welding the plug 400 and the terminal 320 to the outside of the battery cell 10.

[0147] Furthermore, the edge of the outer surface of the plug 400 can be configured to be recessed inward. That is, the plug 400 can have a recess 430. The recess 430 can be configured to be recessed inward on the edge of the outer surface of the first portion 410. The recess 430 can be provided at the portion where the second weld bead W2 is formed.

[0148] According to the embodiments described above in this disclosure, when the plug 400 and the terminal 320 are laser welded, the second weld bead W2 can be prevented from protruding outwards. That is, the upper surface of the plug 400 can be provided with a flat surface. The outer surfaces of the plug 400, the second weld bead W2, and the terminal 320 can be provided with flat surfaces or further processed to provide flat surfaces, thereby providing sufficient contact area with electrical connection components such as busbars.

[0149] Figure 13 This is a perspective view showing the lower part of a battery cell according to an embodiment of the present disclosure. Figure 14 This is a cross-sectional view showing the lower part of a battery cell according to an embodiment of the present disclosure, and Figure 15 This is a bottom plan view of a battery cell according to an embodiment of the present disclosure.

[0150] In addition, refer to Figures 13 to 15The housing 200 may include a second recess G2. The second recess G2 may be formed on the outer surface of the closure portion 200b of the housing 200. The second recess G2 may be configured such that at least a portion of the outer surface of the closure portion 200b is recessed inward. A plurality of second recesses G2 may be provided. The plurality of second recesses G2 may be configured to be spaced apart from each other in a circumferential direction. These second recesses G2 may be configured to be connected to the second electrode 120.

[0151] According to embodiments of this disclosure, the second uncoated portion 120a of the second electrode 120 can be directly connected to the housing 200. For example, the second uncoated portion 120a of the second electrode 120 can be welded to the second recess G2 of the housing 200. Therefore, the housing 200 can have a second polarity.

[0152] The closed portion 200b of the housing 200 can be connected to the second uncoated portion 120a of the second electrode 120 by laser welding. Therefore, the closed portion 200b of the housing 200 may include a third weld bead W3. The third weld bead W3 can be formed when the housing 200 and the second electrode 120 are connected. The third weld bead W3 can be formed by laser welding or the like.

[0153] In embodiments of this disclosure, a laser beam can be irradiated from the outside of the housing 200 to connect the housing 200 and the second uncoated portion 120a. Therefore, a third weld bead W3 can be provided on the outer surface of the closed portion 200b of the housing 200. Specifically, the third weld bead W3 can be formed on the outer surface of the second recess G2.

[0154] For example, such as Figure 15 In the embodiments shown, the third weld bead W3 can be formed in the radial direction. However, the shape of the third weld bead W3 is merely exemplary, and the third weld bead W3 can be formed in other shapes.

[0155] In this embodiment, a current collector is not required on the second uncoated portion 120a of the second electrode 120. This reduces component costs and simplifies the process.

[0156] Figure 16 This is a schematic perspective view of a battery pack according to an embodiment of the present disclosure.

[0157] As described above, the battery pack 1 according to embodiments of the present disclosure may include a plurality of battery cells 10 of the present disclosure. The battery cells 10 may be housed within the battery pack housing 2. The battery pack 1 may include components for electrical connections between the battery cells 10 and / or a BMS (Battery Management System) configured to control the charging and discharging of the battery cells 10.

[0158] In each battery cell 10, both the positive and negative terminals can be positioned on the upper side. Therefore, when multiple battery cells 10 are electrically connected, both the positive and negative terminals can be connected in one direction, thus simplifying the electrical connection structure.

[0159] This increases the number of battery cells 10 that can be installed in the same space, thereby improving energy density and facilitating electrical wiring. Therefore, excellent space efficiency and high electrical wiring efficiency significantly improve the assembly of electric vehicles and the working process during the assembly and maintenance of the battery pack 1.

[0160] Furthermore, as mentioned above, each battery cell 10 can have a higher energy density than a conventional battery. A battery pack 1 with this higher energy density can store the same amount of energy while reducing its size and weight. Therefore, when a battery pack 1 equipped with such battery cells 10 is installed in a vehicle (such as a vehicle V that uses electricity as its energy source), as... Figure 17 As shown, this can further increase the mileage per unit of energy consumed by the vehicle.

[0161] Figure 17 This is a schematic perspective view of a vehicle according to an embodiment of the present disclosure.

[0162] A vehicle V according to an embodiment of this disclosure may include at least one battery pack 1. The vehicle V may be configured to operate by receiving power from the battery pack 1. The vehicle V may be, for example, an HEV or an EV.

[0163] Next, a method for manufacturing a battery cell according to an embodiment of this disclosure will be described. (Refer to...) Figures 1 to 15 and Figures 18 to 20 To describe the manufacturing method of the battery cell according to this disclosure.

[0164] Figure 18 This is a schematic diagram illustrating the manufacturing process of a battery cell according to an embodiment of the present disclosure.

[0165] Reference Figure 18 The battery cell manufacturing method according to the embodiments of the present disclosure may include an electrode assembly winding step S1, a cover assembly mounting step S2, a terminal / first uncoated portion welding step S3, an electrode assembly insertion step S4, a housing / cover assembly connection step S5, an electrolyte injection step S6, and a plug connection step S7.

[0166] The electrode assembly winding step S1 can be a step of winding an electrode assembly 100, including a first electrode 110, a second electrode 120, and a diaphragm inserted between the first electrode 110 and the second electrode 120, around a winding shaft. Therefore, the electrode assembly 100 can have a structure in which a laminate of the first electrode 110, the second electrode 120, and the diaphragm is wound around a winding shaft in one direction (winding direction).

[0167] The cover assembly installation step S2 can be the step of mounting the cover assembly 300 on one side surface of the electrode assembly 100. The cover assembly 300 can be configured to cover one side surface of the electrode assembly 100. For example, the cover assembly 300 can be placed on the upper surface of the electrode assembly 100.

[0168] According to this manufacturing method, the cover 310, terminal 320, and insulating gasket 330 are pre-assembled to manufacture the cover assembly 300, which is then attached to the housing 200. Therefore, the manufacturing process of the battery cell 10 can be simplified, thereby reducing costs and increasing productivity.

[0169] Terminal / first uncoated portion welding step S3 may be a step of welding the terminal 320 of the cover assembly 300 to the first uncoated portion 110a of the first electrode 110. The terminal 320 may be welded to the first uncoated portion 110a of the first electrode 110.

[0170] The terminal / first uncoated portion welding step S3 may include a process of performing laser welding on the outer surface of the terminal 320 to connect the terminal 320 to the first uncoated portion 110a. Specifically, in the terminal / first uncoated portion welding step S3, welding may be performed on the outer surface of the first recess G1 of the terminal 320. The result of this laser welding is the same as described above. Figure 9 The implementation method shown is the same.

[0171] According to this manufacturing method, since the terminals 320 and the first electrode 110 are laser-welded to the outside of the battery cell 10, even if spatter is generated during welding, it is unlikely to enter the interior of the battery cell 10. Therefore, damage to the separator of the electrode assembly 100 can be minimized, the risk of low voltage generation can be reduced, and the lifespan of the battery cell 10 can be increased.

[0172] Furthermore, according to this manufacturing method, when welding the terminal 320, the process of inserting the ultrasonic welding rod into the central hole of the electrode assembly 100 can be omitted, thereby reducing the diameter of the central hole of the electrode assembly 100. Therefore, the capacity of the battery cell 10 can be increased, and the energy density of the battery cell 10 can be improved.

[0173] The electrode assembly insertion step S4 can be a step of inserting the electrode assembly 100 into the housing 200, which has an opening on one side. The electrode assembly 100, which has a cover assembly 300 connected to the electrode assembly 100, can be inserted into the housing 200 through the opening in the housing 200.

[0174] The housing / cover assembly connection step S5 can be a step of welding the sidewall 200a of the housing 200 and the outer surface of the cover assembly 300. For example, the outer surface of the housing 200 and the inner surface of the edge of the cover assembly 300 can be joined by welding. In this case, the welded portion ( Figure 1 Part A) can be positioned along the outer periphery of the upper edge of the housing 200.

[0175] Electrolyte injection step S6 can be a step of injecting electrolyte through the second hole H2 of terminal 320. The electrolyte can move into the interior of electrode assembly 100 through the second hole H2.

[0176] The plug connection step S7 can be the step of inserting the plug 400 and connecting it to the second hole H2.

[0177] The manufacturing steps of the battery cell 10 described above can be performed sequentially, and additional steps can be performed between the corresponding steps.

[0178] Figure 19 This is a schematic diagram illustrating the manufacturing process of a battery cell according to another embodiment of the present disclosure.

[0179] Additionally, refer to Figure 19 In addition to reference Figure 18 In addition to the described battery cell manufacturing method, another embodiment of the battery cell manufacturing method according to this disclosure may further include a casing / second uncoated portion welding step S8.

[0180] The shell / second uncoated portion welding step S8 can be a step of welding the closed portion 200b formed on the other side of the shell 200 to the uncoated portion of the second electrode 120. The shell / second uncoated portion welding step S8 can include performing laser welding to connect the uncoated portions of the shell 200 and the second electrode 120 to the outside of the second recess G2 of the shell 200. The result of this laser welding is the same as described above. Figures 13 to 15 The results of the implementation shown are the same.

[0181] For example, the housing / second uncoated portion welding step S8 can be performed after the electrode assembly insertion step S4. Preferably, the housing / second uncoated portion welding step S8 can be performed before the housing / cover assembly connection step S5. Therefore, the internal components of the housing 200 can be fixed, thereby ensuring a stable connection between the cover assembly 300 and the housing 200.

[0182] According to this manufacturing method, compared with existing battery cell manufacturing methods, the insulator insertion step can be omitted, thereby simplifying the process and reducing costs. Furthermore, since no insulator component is required, the number of components is reduced, thus saving costs.

[0183] Furthermore, eliminating the insulator allows for an increase in the size of the electrode assembly 100 inside the housing 200, thereby increasing the energy density.

[0184] Figure 20 This is a schematic diagram illustrating a portion of the manufacturing process of a battery cell according to another embodiment of the present disclosure.

[0185] Reference Figure 20 The method for manufacturing a battery cell according to an embodiment of the present disclosure may further include a cover assembly step S9. The cover assembly step S9 may be performed before the cover assembly installation step S2.

[0186] In addition, the cover assembly step S9 may include step P1 of mounting the insulating washer on the terminal, step P2 of mounting the cover on the insulating washer, and step P3 of crimping the ends of the terminal and the insulating washer together.

[0187] In step P1, where the insulating washer is installed on the terminal, the insulating washer 330 can be placed on the mounting portion 322 of the terminal 320. Next, in step P2, where the cover is installed on the insulating washer, the cover 310 can be placed on the horizontal portion 331 of the insulating washer 330.

[0188] The manufacturing result of the cover assembly 300 is the same as described above. Figure 5 The manufacturing results of the embodiments shown are the same.

[0189] According to this manufacturing method, an electrically insulating state can be maintained between the terminal 320 having a first polarity and the cover 310 having a second polarity. Therefore, a structure can be realized in which the terminal 320 can be used as a first terminal and the remaining area of ​​the cover assembly 300 (excluding the area occupied by the terminal 320) can be used as a second terminal.

[0190] Therefore, according to the battery cell 10 of this disclosure, multiple battery cells 10 can be electrically connected so that the positive and negative electrodes are connected in one direction, thereby simplifying the electrical connection structure.

[0191] Furthermore, according to the manufacturing method described above, the terminal 320 can be connected to the first electrode 110 of the electrode assembly 100 without being riveted to the first hole H1 of the cover 310, and can also be exposed to the outside of the cover assembly 300. Therefore, when connecting the terminal 320, the riveting process can be eliminated, thereby simplifying the manufacturing process of the battery cell 10 to reduce costs and increase productivity.

[0192] Furthermore, according to this manufacturing method, the inward protrusion can be minimized compared to when the terminal 320 is riveted to the first hole H1. This can increase the vertical height of the electrode assembly 100, thereby increasing the energy density of the battery cell 10.

[0193] Furthermore, according to this manufacturing method, the cover 310 can be configured to be spaced apart from the electrode assembly 100. Therefore, the cover 310 and the first electrode 110, which have different polarities, can be physically separated and stably maintained in an electrically insulating state.

[0194] In other words, according to this manufacturing method, even without a separate insulator, the cover 310 and the first electrode 110, which have different polarities, can be electrically insulated from each other. This allows the insulator to be removed, thereby increasing the vertical height of the electrode assembly 100. This also increases the energy density of the battery cell 10. Furthermore, the elimination of components can reduce costs and increase productivity.

[0195] The terminal / insulating washer crimping step P3 can be a step of crimping the cover assembly 300 using a crimping device. In the terminal / insulating washer crimping step P3, the crimping device can move from the outside to the inside in the vertical direction of the cover assembly 300 to crimp the end of the protrusion 323 of the terminal 320 and the end of the vertical portion 332 of the insulating washer 330. The crimping result of the cover assembly 300 is the same as described above. Figure 7 The implementation method shown is the same.

[0196] Therefore, the insulating washer 330 can be configured to surround the inner surface of the cover 310. That is, the insulating washer 330 can be configured to contact the inner surface of the first hole H1 as well as the inner and outer surfaces of the cover 310.

[0197] According to this manufacturing method, the fixing strength of the insulating gasket 330 can be improved through a simple structure. Therefore, even when an external impact is applied to the battery cell 10 or a thermal event occurs, the insulating gasket 330 between the cover 310 and the terminal 320 can be prevented from detaching from the cover 310 and the terminal 320. Thus, electrical insulation between the terminal 320 and the cover 310, which have different polarities, can be stably maintained.

[0198] Furthermore, according to the manufacturing method described above, the fixing strength of the terminal 320 can be improved through a simple structure. Therefore, even when an external impact is applied to the battery cell 10 or a thermal event occurs, the terminal 320 can be prevented from separating from the cover 310. In addition, the sealing performance of the housing 200 can be improved.

[0199] As described above, although this disclosure has been described with reference to limited embodiments and drawings, this disclosure is not limited thereto, and various modifications and variations are possible for those skilled in the art to which this disclosure pertains without departing from the technical concept of this disclosure and the equivalent scope of the claims described below.

Claims

1. A battery cell, the battery cell comprising: An electrode assembly, the electrode assembly comprising a first electrode wound around a winding shaft, a second electrode, and a diaphragm inserted between the first electrode and the second electrode; A housing configured to receive the electrode assembly and be electrically connected to the second electrode through an opening formed on one side, and having a closure formed on the other side; as well as A cover assembly configured to cover the opening of the housing and including a cover having a first hole, a terminal configured to be at least partially inserted into the first hole and coupled to the first electrode, and an insulating gasket disposed between the cover and the terminal.

2. The battery cell according to claim 1, in, The cover assembly is configured to be circumferentially connected along the sidewall of the housing.

3. The battery cell according to claim 1, in, The cover is configured to be spaced apart from the electrode assembly.

4. The battery cell according to claim 1, in, The cover includes: An exhaust section is configured to rupture and discharge gas generated within the housing when the internal pressure of the housing exceeds a certain level.

5. The battery cell according to claim 1, in, The terminal includes a flat portion having an inner surface formed in the shape of a flat plate.

6. The battery cell according to claim 5, in, The terminal includes a mounting portion configured to protrude radially outward from the outer surface of the flat portion, such that the insulating washer is mounted on the mounting portion.

7. The battery cell according to claim 5, in, The terminal includes a protrusion configured to project vertically outward from the outer surface of the flat portion.

8. The battery cell according to claim 7, in, The end of the protrusion is configured to be bent outward in the radial direction.

9. The battery cell according to claim 1, in, The insulating gasket is configured to surround the inner circumferential surface of the cover.

10. The battery cell according to claim 1, in, The terminal has a first recess, which is configured such that at least a portion of the terminal is recessed inward, and the first recess is configured to be connected to the first electrode.

11. The battery cell according to claim 10, in, The terminal has a first weld bead formed on the outer surface of the first recess when it is welded to the first electrode.

12. The battery cell according to claim 1, in, The terminal has a second hole formed therein.

13. The battery cell according to claim 12, The battery cell also includes a plug configured to be inserted into the second hole.

14. The battery cell according to claim 13, in, The plug has a stepped shape.

15. The battery cell according to claim 13, in, The second weld bead is formed along the edge of the second hole and the edge of the outer surface of the plug.

16. The battery cell according to claim 13, in, The edge of the outer surface of the plug is configured to be recessed inward.

17. The battery cell according to claim 1, in, The housing has a second recess that is at least partially recessed inward from the outer surface of the closure and is configured to be connected to the second electrode.

18. The battery cell according to claim 17, in, The housing has a third weld bead formed on the outer surface of the second recess when it is welded to the second electrode.

19. A battery pack comprising a plurality of battery cells according to any one of claims 1 to 18.

20. A vehicle comprising a battery pack according to claim 19.

21. A method for manufacturing a battery cell, the method comprising the following steps: An electrode assembly having a first electrode, a second electrode, and a diaphragm inserted between the first electrode and the second electrode wound and stacked around a winding shaft; The cover assembly is mounted on one side surface of the electrode assembly; The terminals of the cover assembly are welded to the uncoated portion of the first electrode; The electrode assembly is inserted into a housing with an opening on one side; The sidewall of the outer shell is welded to the outer peripheral surface of the cover assembly; Electrolyte is injected through the second hole of the cover assembly; as well as Insert the plug and connect it to the second hole.

22. The method for manufacturing a battery cell according to claim 17, The manufacturing method further includes the following steps: The closure formed on the other side of the housing is welded to the uncoated portion of the second electrode.

23. The method for manufacturing a battery cell according to claim 17, The manufacturing method further includes a cover assembly step, which comprises the following steps: Install the insulating washer onto the terminal; install the cover onto the insulating washer; and crimp the terminal and the insulating washer together.

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