Battery cell, and battery pack and vehicle including the same

Abstract

The present invention relates to a battery cell comprising: an electrode assembly in which a separator disposed between a first electrode and a second electrode is wound around a winding axis; a housing having an opening on one side for receiving the electrode assembly and a closed portion on the other side, and the housing being configured to be electrically connected to the second electrode; and a lead assembly configured to cover the opening portion of the housing and including a lead having a first hole, an insulating liner configured to be at least partially inserted into the first hole and having a second hole, and a terminal configured to be at least partially inserted into the second hole.

Description

Technical Field

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

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0134160, filed with the Korean Intellectual Property Office on October 2, 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 improving environmental sustainability and energy efficiency, not only because of their key 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 the battery pack for an electric vehicle (EV) or hybrid electric vehicle (HEV). In this case, it is common practice to first form a battery module including at least one battery cell, and then add other components to one or more battery modules to configure a battery pack or battery rack. Alternatively, battery packs have recently been manufactured in a cell-to-pack type, in which multiple battery cells are stored directly in the battery pack housing rather than being modularized.

[0005] The demand for can-type battery cells used in vehicle battery packs is growing. The cans can be square or cylindrical. Cylindrical battery cells have a structure in which a wound electrode assembly, constructed by winding a first electrode, a second electrode, and a separator around a winding axis with a central hole in the core, is housed within the cylindrical can, thus providing 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 housing. The terminal of the second electrode, which is electrically connected to the electrode assembly, is riveted to a through-hole formed on the closed surface of the housing; therefore, conventional battery cells include riveted terminals.

[0007] In this configuration, to join the riveted terminals and the electrode assembly, an ultrasonic welding rod is inserted through the opening in the housing into the central hole of the electrode assembly, and then ultrasonic welding is performed inside the housing.

[0008] However, conventional methods suffer from the problem of damage to the diaphragm of the electrode assembly due to spatter generated during ultrasonic welding. Furthermore, the center hole of the electrode assembly needs to be of a certain size because the diameter of the ultrasonic welding rod is difficult to reduce, thus limiting the ability to increase the energy density of the electrode assembly.

[0009] In addition, due to the presence of riveting terminals and insulators inside the housing to insulate the housing and the second electrode, it is difficult to increase the vertical volume of the electrode assembly.

[0010] Furthermore, the different and complex shapes of the components inside the casing, as well as the complex manufacturing process, make it difficult to increase productivity and reduce costs in conventional battery cell manufacturing.

[0011] Therefore, a method is needed to simplify the component bonding process 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 address problems in the related art, and therefore relates to providing a battery cell that can improve productivity and manufacturability and increase the energy density of the battery cell during manufacturing, as well as a battery pack and a vehicle including the battery cell.

[0014] However, the technical problems that the present invention seeks to solve are not limited to those described above, and those skilled in the art will clearly understand from the following description of the invention that are 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 constructed by winding a first electrode, a second electrode, and a separator inserted between the first electrode and the second electrode about a winding axis; a housing configured to receive the electrode assembly through an opening formed on one side, the housing having a closed portion formed on the other side, and configured to be electrically connected to the second electrode; and a cover assembly configured to cover the opening of the housing, and including a cover having a first hole, an insulating gasket configured to be at least partially inserted into the first hole and having a second hole, and a terminal configured to be at least partially inserted into the second hole.

[0017] The cover may include a venting section configured to rupture and release gas generated within the housing when the internal pressure of the housing exceeds a certain level.

[0018] The insulating gasket can be configured to protrude further inward than the cover in the vertical direction.

[0019] The insulating pad may include a first portion and a second portion, the first portion being configured to form a second hole and support the outer peripheral surface of the terminal, and the second portion being configured to project inwardly from the first portion in a radial direction and support the inner surface of the terminal.

[0020] The insulating liner may include a third portion of the inner surface configured to support the cover.

[0021] The battery cell may also include a first current collector disposed on one side of the electrode assembly and configured to be electrically connected to the first electrode.

[0022] The insulating gasket can be configured to space the cover and the first current collector apart from each other.

[0023] The first current collector may include an uncoated portion connection configured to connect to an uncoated portion of the first electrode.

[0024] The first current collector may have an injection hole formed through the connection of the uncoated portion.

[0025] The first current collector may include a terminal connection portion configured to protrude toward and connect to a terminal.

[0026] The terminal may have an insertion hole configured such that at least a portion of the first current collector is inserted therein.

[0027] The first weld bead can be formed along the edge of the insertion hole and the edge of the outer surface of the first current collector.

[0028] The cover assembly can be configured to be connected along the periphery of the wall members of the housing.

[0029] The housing may have a second weld bead formed when the second electrode is welded to the outer surface of the closed portion.

[0030] In another aspect of this disclosure, a battery pack comprising a plurality of battery cells according to embodiments of this disclosure is provided.

[0031] In another aspect of this disclosure, a vehicle is provided that includes a battery pack according to an embodiment of this disclosure.

[0032] In another aspect of this disclosure, a method for manufacturing a battery cell is provided, the method comprising the steps of: winding an electrode assembly around a winding axis, the electrode assembly being constructed by laminating a first electrode, a second electrode, and a diaphragm inserted between the first electrode and the second electrode; connecting a first current collector configured to be electrically connected to the first electrode to one side of the electrode assembly; inserting the electrode assembly into a housing having an opening on one side; injecting electrolyte through an injection port of the first current collector; cleaning residual electrolyte from a terminal connection of the first current collector; mounting a cover assembly onto the opening of the housing; welding a wall member of the housing to the outer peripheral surface of the cover assembly; and welding the terminals of the cover assembly to the terminal connections of the first current collector.

[0033] Furthermore, the method for manufacturing a battery cell according to embodiments of the present disclosure may further include the steps of: attaching an uncoated portion of a second electrode; and welding the uncoated portion of the second electrode to a closed portion formed on the other side of the housing.

[0034] Furthermore, the method for manufacturing a battery cell according to embodiments of the present disclosure may also include a cover assembly step, which includes the following steps: inserting an insulating liner into a first hole in the cover; and inserting a terminal into a second hole in the insulating liner.

[0035] Beneficial effects

[0036] According to one aspect of this disclosure, the joining structure between the battery cell housing, cover, terminals and first current collector can simplify the process, thereby reducing costs and increasing productivity.

[0037] According to another aspect of this disclosure, riveted terminals and insulators protruding into the casing in conventional battery cells can be eliminated, thereby increasing the vertical height of the electrode assembly. This improves the energy density of the battery cell.

[0038] According to another aspect of this disclosure, by laser welding the current collector, terminals, and / or housing from the outside of the battery cell, welding spatter generated during welding can be prevented from entering the battery cell, thereby solving problems related to damage to the separator in the electrode assembly and reduction in battery capacity and life.

[0039] Furthermore, according to this aspect of the disclosure, since the welding end does not need to be inserted into 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.

[0040] In addition, the present invention may have various other effects, and these effects will be described in various embodiments, or descriptions of effects that can be easily deduced by those skilled in the art will be omitted. Attached Figure Description

[0041] 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.

[0042] Figure 1 This is an overall perspective view of a battery cell according to an embodiment of the present disclosure.

[0043] Figure 2 This is a longitudinal cross-sectional view of a battery cell according to an embodiment of the present disclosure.

[0044] Figure 3 This is a perspective view of a cover assembly included in a battery cell according to an embodiment of the present disclosure.

[0045] 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.

[0046] Figure 5 This is a cross-sectional view of a cover assembly included in a battery cell according to an embodiment of the present disclosure.

[0047] Figure 6 This is a perspective view of a cover included in a battery cell according to an embodiment of the present disclosure.

[0048] Figure 7 This is a perspective view of an insulating pad included in a battery cell according to an embodiment of the present disclosure.

[0049] Figure 8 This is a perspective view of terminals included in a battery cell according to an embodiment of the present disclosure.

[0050] Figure 9 This is a perspective view of a first current collector included in a battery cell according to an embodiment of the present disclosure.

[0051] Figure 10 This is a partially exploded cross-sectional view of a battery cell according to an embodiment of the present disclosure.

[0052] Figure 11 This is a cross-sectional view of the upper part of a battery cell according to an embodiment of the present disclosure.

[0053] Figure 12 This is a perspective view of the upper part of a battery cell according to an embodiment of the present disclosure.

[0054] Figure 13 This is a cross-sectional view of the lower part of a battery cell according to an embodiment of the present disclosure.

[0055] Figure 14 This is a plan view of the bottom of a battery cell according to an embodiment of the present disclosure.

[0056] Figure 15 This is a schematic perspective view of a battery pack according to an embodiment of the present disclosure.

[0057] Figure 16 This is a schematic perspective view of a vehicle according to an embodiment of the present disclosure.

[0058] Figure 17 This is a schematic diagram illustrating the manufacturing process of a battery cell according to an embodiment of the present disclosure.

[0059] Figure 18 This is a schematic diagram illustrating the manufacturing process of a battery cell according to another embodiment of the present disclosure.

[0060] Figure 19 This is a diagram schematically illustrating some steps of the manufacturing process of a battery cell according to another embodiment of the present disclosure. Detailed Implementation

[0061] Preferred embodiments of the present disclosure will be described in detail below 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 is interpreted based on the principle that inventors are allowed to appropriately define terms for best interpretation, and on the meaning and concept corresponding to the technical aspects of the invention.

[0062] Therefore, the description presented herein is merely a preferred example for illustrative purposes and does not represent the full scope of the invention. It should be understood that other equivalents and modifications may be made thereto without departing from the scope of this disclosure.

[0063] Furthermore, the present invention may include various embodiments. Redundant descriptions of substantially the same or similar constructions will be omitted from the various embodiments, and descriptions will be based on the differences between them.

[0064] At the same time, 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 of the target object or the observer's position.

[0065] For ease of explanation, in this specification, the longitudinal direction of the winding axis of the electrode assembly wound in the form of a core will be referred to as the vertical direction. 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.

[0066] Figure 1This is an overall perspective view of a battery cell according to an embodiment of the present disclosure. 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.

[0067] The battery cell 10 according to embodiments of the present disclosure 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.

[0068] Preferably, the battery cell 10 can be, for example, 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.

[0069] 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.

[0070] The electrode assembly 100 may have a structure in which a laminate including a first electrode 110, a second electrode 120 and a diaphragm is wound around a winding axis in one direction (winding direction).

[0071] The first electrode 110 and / or the second electrode 120 may be constructed in the form of a sheet. 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.

[0072] 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, i.e., a region uncoated with electrode active material. The first electrode 110 and / or the second electrode 120 may each include an uncoated portion. The uncoated portion may be disposed at the longitudinal end of the first electrode 110 and / or the second electrode 120 in the winding direction. Furthermore, the uncoated portion may be configured to be exposed to the outside of the diaphragm. At least a portion of the uncoated portion itself may serve as an electrode tab.

[0073] Furthermore, the first electrode 110 and the second electrode 120 may have opposite polarities. This disclosure will focus on an embodiment in which the first electrode 110 is a positive electrode and the second electrode 120 is a negative electrode.

[0074] The diaphragm 30 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 diaphragm 30 can be a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fibers or polyethylene terephthalate fibers.

[0075] The housing 200 may be configured to receive the electrode assembly 100 through an opening formed on one side thereon. The housing 200 may include a closed portion 200b formed on the opposite side of the opening. In this embodiment, the opening may be located at the top of the housing 200 (in the +Z axis direction), and the closed portion 200b may be located at the bottom of the housing 200 (in the -Z axis direction).

[0076] The housing 200 can be configured as a cylindrical shape with an opening. More specifically, the housing 200 may include a wall member 200a. The wall member 200a can be configured to surround the outer surface of the electrode assembly 100. The wall member 200a may have an opening at one end. The wall member 200a may be configured to extend upward from the closed portion 200b.

[0077] Additionally, the housing 200 may include conductive metal. The housing 200 may be configured to be electrically connected to the second electrode 120 of the electrode assembly 100. In this case, the housing 200 may serve as a second terminal of the battery cell 10.

[0078] The cover assembly 300 can be configured to cover an opening in the housing 200. The cover assembly 300 can be configured to be substantially plate-shaped. The cover assembly 300 can be attached 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.

[0079] Specifically, the cover assembly 300 may include a cover 310, a terminal 330, and an insulating gasket 320.

[0080] The cover 310 can be configured to be substantially plate-shaped. The circumferential portion 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.

[0081] Additionally, the cover 310 may include a first hole H1. The first hole H1 may be formed by perforating a portion of the cover 310.

[0082] The insulating pad 320 can be configured to be at least partially inserted into the first hole H1. Furthermore, the insulating pad 320 can have a second hole H2. The second hole H2 can be formed by perforating a portion of the insulating pad 320.

[0083] Terminal 330 can be configured to be at least partially inserted into the second hole H2. Furthermore, terminal 330 can include a conductive metal. For example, terminal 330 can be made of aluminum or an aluminum alloy (Al 1100). Terminal 330 can be configured to be electrically connected to the first electrode 110. Additionally, terminal 330 can be configured such that its outer surface is exposed outside the cover 310. In this case, terminal 330 can serve as a first terminal of the battery cell 10.

[0084] An insulating pad 320 can be inserted between the cover 310 and the terminal 330. The insulating pad 320 can be made of an electrically insulating material (e.g., silicone). The insulating pad 320 can be made of PBT. PBT is preferred because it is electrically insulating, inexpensive, and does not react with the electrolyte. The insulating pad 320 can be configured to insulate the cover 310 and the terminal 330 from each other. Simultaneously, the insulating pad 320 can be configured to insulate the cover 310 and the electrode assembly 100 from each other. In particular, the insulating pad 320 can be configured to insulate the cover 310 and the first electrode 110 from each other.

[0085] In other words, the insulating liner 320 can maintain electrical insulation between the terminal 330 with the first polarity and the cover 310 with the second polarity. Therefore, the terminal 330 can be used as the first terminal, and the remaining area of ​​the cover assembly 300 (excluding the area occupied by the terminal 330) can be used as the second terminal.

[0086] Therefore, when multiple battery cells 10 are electrically connected, the battery cells 10 according to this disclosure can have their electrical connection structure simplified by connecting the positive and negative terminals from one direction. Additionally, according to embodiments of this disclosure, the sealing of the housing 200 can be improved by providing an insulating gasket 320.

[0087] Furthermore, according to another aspect of this disclosure, the cover 310, terminal 330, and insulating pad 320 can be pre-assembled into the cover assembly 300, and then the cover assembly 300 can be coupled to the housing 200, which can simplify the manufacturing process of the battery cell 10, reduce costs, and improve productivity.

[0088] In the following text, reference will be made to Figures 6 to 8 as well as Figure 5 The corresponding parts of the cover assembly 300 are described in more detail.

[0089] Figure 5This is a cross-sectional view of a cover assembly included in a battery cell according to an embodiment of the present disclosure, and Figure 6 This is a perspective view of a cover included in a battery cell according to an embodiment of the present disclosure.

[0090] refer to Figure 5 When assembling the cover assembly 300, an insulating gasket 320 can be inserted into the cover 310, and a terminal 330 can be inserted into the insulating gasket 320, thereby forming the cover assembly 300. In this case, the insulating gasket 320 can be disposed between the cover 310 and the terminal 330 to insulate the cover 310 and the terminal 330, which have different polarities.

[0091] More specifically, see reference Figure 5 and Figure 6 The cover 310 can be constructed to be substantially plate-shaped. The cover 310 can have a first hole H1 formed in the center. That is, the cover 310 can be constructed as an annular plate. The cover 310 can be constructed to extend wide in the horizontal direction.

[0092] In addition, the cover 310 may include a venting portion 311. The venting portion 311 may be configured to rupture when the internal pressure of the housing 200 increases to a certain level or higher and the gas generated within the housing 200 is released.

[0093] 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 thickness thinner than the surrounding area. (Reference) Figure 6 The exhaust portion 311 can form a generally circular closed loop. The exhaust portion 311 can be provided, for example, in the form of a groove formed on one side of the cover 310.

[0094] According to the configuration of the above-described embodiment of this disclosure, when a thermal event occurs and the internal pressure of the housing 200 increases above a reference value, the vent portion 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 notch depth of the vent portion 311 can be designed such that the vent portion 311 ruptures under an internal pressure of approximately 25 bar or higher.

[0095] Additionally, the vent portion 311 can be configured to divide the cover 310 into two regions. For example, the cover 310 can be divided by the vent portion 311 into an inner portion 312 and an outer portion 313. The inner portion 312 and the outer portion 313 can be arranged in the radial direction, and the vent portion 311 is inserted between the inner portion 312 and the outer portion 313. Specifically, the inner portion 312 can be positioned radially inward from the vent portion 311. The outer portion 313 can be positioned radially outward from the vent portion 311.

[0096] The first hole H1 can be formed in the inner portion 312. Furthermore, the outer portion 313 can be configured to connect to the housing 200. For example, the outer portion 313 can be configured to be mounted on the wall member 200a of the housing 200.

[0097] Figure 7 This is a perspective view of an insulating pad included in a battery cell according to an embodiment of the present disclosure.

[0098] Return to reference Figure 5 The insulating gasket 320 can be configured to be inserted into the first hole H1 of the cover 310. Furthermore, the insulating gasket 320 can be configured to protrude inward from the cover 310 in the vertical direction. Therefore, according to the above-described configuration of this disclosure, the insulating gasket 320 can be configured to space the cover 310 and the electrode assembly 100 apart, thereby insulating the cover 310 and the electrode assembly 100 from each other.

[0099] refer to Figure 7 The insulating pad 320 can be configured in the form of a stepped cylinder. The insulating pad 320 can be configured to have sidewalls along its outer edge.

[0100] As a more specific example, the insulating pad 320 may include a first portion 321 and a second portion 322. The first portion 321 may be configured to form a second hole H2. That is, the second hole H2 may be formed from the inner surface of the first portion 321.

[0101] The outer surface of the first portion 321 can be configured to be exposed to the outside. In this case, the outer peripheral surface of the first portion 321 can be configured to contact the inner surface of the cover 310. The cross-sectional area of ​​the first portion 321 can be configured to approximately correspond to the cross-sectional area of ​​the first hole H1.

[0102] Furthermore, the cross-sectional area of ​​the second hole H2 can be configured to approximately correspond to the entire cross-sectional area of ​​the terminal 330. Therefore, when the terminal 330 is inserted into the second hole H2 of the first portion 321, the inner surface of the first portion 321 can be configured to support the outer peripheral surface of the terminal 330.

[0103] The first part 321 can be configured to space the terminal 330 and the cover 310 apart from each other. Therefore, the cover 310 and the terminal 330 can be insulated from each other.

[0104] The second portion 322 can be configured to project inwardly from the first portion 321 in the radial direction. The second portion 322 can be configured to have a step extending inwardly from the first portion 321. That is, the outer surface of the second portion 322 can be set to be further inward than the inner surface of the first portion 321. The cross-sectional area of ​​the second portion 322 can be configured to substantially correspond to the entire cross-sectional area of ​​the terminal 330.

[0105] Additionally, the second portion 322 can be configured to allow the terminal 330 to be disposed thereon. Therefore, when the terminal 330 is inserted into the second hole H2 of the first portion 321, the outer surface of the second portion 322 can be configured to support the inner surface of the terminal 330.

[0106] Additionally, the second part 322 may include a third hole H3. The third hole H3 may be configured to communicate with the second hole H2.

[0107] Furthermore, the insulating pad 320 may include a third portion 323. The third portion 323 may be configured to extend radially outward from the first portion 321 to have a step. The third portion 323 may be inserted between the cover 310 and the electrode assembly 100. The third portion 323 may be configured to support the inner surface of the cover 310.

[0108] According to the above-described implementation of this disclosure, the cover 310 and the electrode assembly 100 can be stably spaced apart by the third portion 323.

[0109] In other words, according to the above-described implementation of the present disclosure, the structure of the insulating liner 320 allows the cover 310 and the electrode assembly 100 to be spaced apart from each other, so that the cover 310 and the electrode assembly 100 can be insulated from each other.

[0110] Figure 8 This is a perspective view of terminals included in a battery cell according to an embodiment of the present disclosure.

[0111] refer to Figure 5 Terminal 330 can be configured to at least partially insert into the second hole H2 of insulating gasket 320 and be positioned on the second portion 322. In this case, the outer surfaces of cover 310, insulating gasket 320, and terminal 330 can form a single plane, or terminal 330 can be configured to protrude outwards. Whether terminal 330 protrudes outwards can vary depending on the height difference between the first portion 321 and the second portion 322. For example, if the height difference between the first portion 321 and the second portion 322 is equal to the height of terminal 330, then terminal 330 may not protrude outwards.

[0112] However, as Figure 5 As disclosed in the illustrated embodiment, if the height difference between the first portion 321 and the second portion 322 is less than the height of the terminal 330, the outer surface of the terminal 330 may protrude partially outward. In this case, the terminal 330 may be located at the outermost portion of the cover assembly 300.

[0113] According to the above-described configuration of this disclosure, the terminal 330 can be disposed on the insulating pad 320 and exposed to the outside of the cover assembly 300 without being riveted to the second hole H2 of the insulating pad 320. Therefore, when the terminal 330 is joined, the riveting process can be eliminated, thereby simplifying the manufacturing process of the battery cell 10, reducing costs, and increasing productivity.

[0114] Furthermore, according to the embodiment of this disclosure, the inward protrusion caused by the terminal 330 being riveted to the second hole H2 of the insulating pad 320 can be eliminated. This increases the vertical height of the electrode assembly 100, thereby improving the energy density of the battery cell 10.

[0115] Additionally, refer to Figure 8 Terminal 330 can be configured to be substantially plate-shaped. In particular, terminal 330 can be configured to be ring-shaped. That is, terminal 330 can have an annular edge. In this case, terminal 330 can have an insertion hole H4.

[0116] Figure 9 This is a perspective view of a first current collector included in a battery cell according to an embodiment of the present disclosure. Furthermore, Figure 10 This is a partial exploded cross-sectional view of a battery cell according to an embodiment of the present disclosure. Figure 11 This is a cross-sectional view of the upper part of a battery cell according to an embodiment of the present disclosure.

[0117] refer to Figure 9 The battery cell 10 according to embodiments of the present disclosure may further include a first current collector 400. The first current collector 400 may be disposed on one side of the electrode assembly 100. For example, the first current collector 400 may be disposed on the upper side of the electrode assembly 100. The first current collector 400 may be configured to be electrically connected to the first electrode 110.

[0118] The first current collector 400 can be configured to electrically connect the first electrode 110 and the terminal 330. The first current collector 400 can be connected to an uncoated portion of the first electrode 110 disposed in the electrode assembly 100. In addition, the first current collector 400 can be connected to the terminal 330.

[0119] Reference Figure 9The structure of the first current collector 400 is described in detail. At least a portion of the first current collector 400 may be configured to be inserted into the insertion hole H4 and connected to the terminal 330.

[0120] More specifically, the first current collector 400 may include an uncoated portion connection 410 and a terminal connection 420.

[0121] The uncoated portion connection 410 can be configured to face the side of the electrode assembly 100. The uncoated portion connection 410 can be configured to be substantially plate-shaped. The uncoated portion connection 410 can be configured such that the uncoated portion of the first electrode 110 is connected thereto. The uncoated portion connection 410 can extend in the radial direction and have sufficient connection area with the uncoated portion of the first electrode 110.

[0122] The terminal connection portion 420 can be configured such that a portion of the uncoated connection portion 410 protrudes outward in the vertical direction. The terminal connection portion 420 can, for example, be positioned approximately at the center of the first current collector 400. The terminal connection portion 420 can be positioned at a location corresponding to a central hole formed in the core of the electrode assembly 100. Additionally, the terminal connection portion 420 can be configured to protrude toward the terminal 330. The terminal connection portion 420 can be configured in a cylindrical shape. The upper surface of the terminal connection portion 420 can be provided as a flat surface.

[0123] In particular, reference Figure 10 and Figure 11 The terminal connector 420 can be configured to be inserted into the insertion hole H4 of the terminal 330. That is, the terminal connector 420 can be configured to pass sequentially through the third hole H3 and the insertion hole H4, such that its outer surface is exposed to the outside.

[0124] The cross-sectional area of ​​the terminal connection portion 420 can be configured to approximately correspond to the cross-sectional area of ​​the insertion hole H4 of the terminal 330. Therefore, the outer peripheral surface of the terminal connection portion 420 can be configured to be supported by the inner peripheral surface of the terminal 330.

[0125] The terminal connector 420 can be configured to connect to the terminal 330. For example, the terminal connector 420 can be connected to the terminal 330 by soldering. Therefore, the terminal 330 can have a first polarity.

[0126] According to the above-described configuration, even if terminal 330 is not directly connected to the first electrode 110, it can still be electrically connected to the electrode assembly 100 via the first current collector 400. Therefore, the inward protrusion of terminal 330 due to riveting can be eliminated. Consequently, the vertical height of the electrode assembly 100 can be increased, thereby improving the energy density of the battery cell 10.

[0127] Additionally, the first current collector 400 may have an injection hole I. The injection hole I may be formed in the uncoated portion connecting portion 410. The injection hole I may be formed by perforating the uncoated portion connecting portion 410.

[0128] The injection port I can be configured to allow electrolyte to be injected into the electrode assembly 100. A first current collector 400 can be coupled to the electrode assembly 100 and then inserted into the housing 200, and electrolyte can be injected through the injection port I of the first current collector 400 before the cover assembly 300 is coupled to the housing 200. The electrolyte can pass through the injection port I and flow into the interior of the electrode assembly 100.

[0129] Multiple injection holes I can be provided. Therefore, multiple uncoated portion connections 410 can also be provided. The injection holes I and the uncoated portion connections 410 can be arranged alternately in the circumferential direction. The number of uncoated portion connections 410 and / or injection holes I can be determined taking into account the required resistance level of the battery cell 10, the required aperture ratio of the first current collector 400, etc. The injection holes I and the uncoated portion connections 410 can have a substantially fan-shaped shape.

[0130] refer to Figure 11 The insulating gasket 320 can be configured to space the cover 310 and the first current collector 400 apart. In particular, the third portion 323 can be configured to space the cover 310 and the first current collector 400 apart. That is, the vertical outer surface of the third portion 323 can contact the cover 310, and the vertical inner surface of the third portion 323 can contact the first current collector 400.

[0131] According to embodiments of this disclosure, even without a separate insulator, the structure of the insulating liner 320 allows for electrical insulation between the cover 310 and the first current collector 400, which have different polarities. Therefore, the insulator can be removed, thereby increasing the vertical height of the electrode assembly 100. This improves the energy density of the battery cell 10. Furthermore, eliminating components can reduce costs and increase productivity.

[0132] Figure 12 This is a perspective view of the upper part of a battery cell according to an embodiment of the present disclosure.

[0133] Terminal 330 can be connected to the first current collector 400 by laser welding. Specifically, the terminal connection portion 420 of the first current collector 400 and terminal 330 can be joined by laser welding. Therefore, terminal 330 can include a first weld bead W1. When terminal 330 and the first current collector 400 are connected, the first weld bead W1 can be formed. The first weld bead W1 can be formed by laser welding.

[0134] In particular, in embodiments of this disclosure, the structure of the cover assembly 300 and the first current collector 400 allows the laser beam to irradiate from the outside of the terminal 330, thereby connecting the terminal 330 and the first current collector 400. Therefore, as... Figure 12 In the embodiment shown, the first weld bead W1 may be disposed outside the terminal 330.

[0135] The first weld bead W1 can be formed along the edge of the insertion hole H4 and the edge of the outer surface of the first current collector 400. Specifically, the first weld bead W1 can be formed along the edge of the outer surface of the terminal connection portion 420.

[0136] For example, such as Figure 12 In the embodiments shown, the terminal connection portion 420 of the first current collector 400 can be configured in a ring shape, and the first weld bead W1 can also be configured in a ring shape. However, the shape of the first weld bead W1 is merely an example, and it can be formed in other shapes.

[0137] According to the above-described configuration of this disclosure, since the terminal 330 and the first current collector 400 can be laser-welded to the outside of the battery cell 10, even if spatter is generated during welding, it will not enter the interior of the battery cell 10, thereby minimizing damage to the separator of the electrode assembly 100. Therefore, the lifespan of the battery cell 10 can be increased.

[0138] Furthermore, according to the above-described implementation of this disclosure, when welding the terminal 330, 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.

[0139] The upper surfaces of the terminal connection portion 420, the first weld bead W1, and the terminal 330 can be provided with flat surfaces, or can be further processed to provide flat surfaces, thereby providing sufficient contact area with electrical connection components such as busbars.

[0140] The cover assembly 300 can be configured such that its inner surface rests on the upper edge of the wall member 200a of the housing 200. In this case, the cover assembly 300 can be configured to be joined along the periphery of the wall member 200a of the housing 200. That is, the connection can be performed at the contact point between the outer edge of the housing 200 and the inner edge 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 weld ( Figure 12 Part A) can be positioned along the outer periphery of the upper edge of the housing 200.

[0141] Alternatively, the housing 200 and the cover assembly 300 may be joined by a joining method other than welding, and the joining method is not limited thereto.

[0142] Figure 13 This is a cross-sectional view of the lower part of a battery cell according to an embodiment of the present disclosure, and Figure 14 This is a plan view of the bottom of a battery cell according to an embodiment of the present disclosure.

[0143] According to embodiments of this disclosure, the uncoated portions of the second electrode 120 can be configured to be bonded together using tape or the like. In particular, if the uncoated portions of the second electrode 120 comprise multiple segments, the multiple segments can be wrapped with tape to form a single shape.

[0144] In this configuration, the uncoated portion of the second electrode 120 can be directly bonded to the housing 200. For example, the uncoated portion of the second electrode 120 can be welded to the closed portion 200b of the housing 200. Therefore, the housing 200 can have a second polarity.

[0145] The closed portion 200b of the housing 200 can be laser welded to the uncoated portion of the second electrode 120. Therefore, the closed portion 200b of the housing 200 can have a second weld bead W2. The second weld bead W2 can be formed when the housing 200 and the second electrode 120 are joined. The second weld bead W2 can be formed by laser welding.

[0146] Furthermore, after attaching the uncoated portion of the second electrode 120 of the electrode assembly 100, the electrode assembly 100 can be inserted through the opening of the housing 200, and then the uncoated portion of the second electrode 120 can be connected to the closed portion 200b of the housing 200. In this case, in the embodiment of this disclosure, a laser beam can be irradiated from the outside of the housing 200 to engage the housing 200 and the uncoated portion of the second electrode 120. Therefore, as Figure 13 and Figure 14 As disclosed in the illustrated embodiment, the second weld bead W2 may be provided on the outer surface of the closed portion 200b of the housing 200.

[0147] For example, such as Figure 14 In the embodiments shown, the second weld bead W2 can be formed in the radial direction. However, the shape of the second weld bead W2 is merely exemplary, and it can be formed in other shapes.

[0148] In this embodiment, a current collector is not required on the uncoated portion of the second electrode 120. This reduces component costs and simplifies the process.

[0149] In addition, unlike the embodiments disclosed herein, the battery cell 10 may also include a second current collector. The second current collector may be disposed on the other side of the electrode assembly 100. For example, the second current collector may be disposed in the lower part of the electrode assembly 100. The second current collector may be coupled to an uncoated portion of the second electrode 120. In this case, the second current collector may be welded to the closed portion 200b of the housing 200.

[0150] Figure 15 This is a schematic perspective view of a battery pack according to an embodiment of the present disclosure.

[0151] The battery pack 1 according to embodiments of the present disclosure may include a plurality of batteries as described above. Battery cells 10 may be housed within the battery pack housing 2. The battery pack 1 may include components for electrical connections to the battery cells 10 and / or a BMS (Battery Management System) configured to control the charging and discharging of the battery cells 10.

[0152] In each battery cell 10, both the positive and negative terminals can be located on the upper side. Therefore, when multiple battery cells 10 are electrically connected, the positive and negative terminals can be connected from one direction, thus simplifying the electrical connection structure.

[0153] 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 work processes during the assembly and maintenance of the battery pack 1.

[0154] Furthermore, as mentioned above, each battery cell 10 can have a higher energy density than before. 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 V that uses electricity as its energy source, such as Figure 16 As shown, the mileage per unit of energy consumed by the vehicle can be further increased.

[0155] Figure 16 This is a schematic perspective view of a vehicle according to an embodiment of the present disclosure.

[0156] 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, a hybrid electric vehicle (HEV) or an electric vehicle (EV).

[0157] Next, a method for manufacturing battery cells according to embodiments of the present disclosure will be described. Reference will be made to the present disclosure. Figures 1 to 14 and Figures 17 to 19 This disclosure describes a method for manufacturing battery cells.

[0158] Figure 17 This is a schematic diagram illustrating the manufacturing process of a battery cell according to an embodiment of the present disclosure.

[0159] refer to Figure 17 The method for manufacturing a battery cell according to embodiments of the present disclosure may include an electrode assembly winding step S1, a first current collector connection step S2, an electrode assembly insertion step S3, an electrolyte injection step S4, a laser cleaning step S5, a cover assembly installation step S6, a housing-cover assembly connection step S7, and a terminal-first current collector welding step S8.

[0160] The electrode assembly winding step S1 can be a step of winding the electrode assembly 100 around a winding axis, the electrode assembly being constructed by laminating a first electrode 110, a second electrode 120, and a diaphragm inserted between the first electrode 110 and the second electrode 120. Therefore, the electrode assembly 100 can have a structure in which the laminate of the first electrode 110, the second electrode 120, and the diaphragm is wound around a winding axis in one direction (winding direction).

[0161] The first current collector connection step S2 can be a step of connecting a first current collector 400, configured to be electrically connected to the first electrode 110, to one side of the electrode assembly 100. The first current collector 400 can be soldered to an uncoated portion of the first electrode 110.

[0162] The electrode assembly insertion step S3 can be a step of inserting the electrode assembly 100 into the housing 200, which has an opening formed on one side. The electrode assembly 100 can be inserted into the housing 200 through the opening. Furthermore, unlike conventional methods, the housing 200 does not have riveting terminals, thus eliminating the need for forming through holes in the housing 200, inserting terminals into the through holes, and riveting and attaching the terminals to the housing 200. Compared to conventional cylindrical battery cell manufacturing methods, this simplifies the process and reduces manufacturing costs.

[0163] Electrolyte injection step S4 can be a step of injecting electrolyte through the injection port I of the first current collector 400. The electrolyte can move into the interior of the electrode assembly 100 through the injection port I.

[0164] Laser cleaning step S5 can be a step of cleaning residual electrolyte on the terminal connection portion 420 of the first current collector 400. Laser cleaning step S5 is a process for removing any residual electrolyte generated in the electrolyte injection step S4 so that welding can be performed later between the terminal connection portion 420 and the terminal 330 of the first current collector 400. Welding will then be performed between the cover assembly 300 and the wall member 200a of the housing 200, so it is desirable to remove any residual electrolyte from the wall member 200a of the housing 200. Residual electrolyte may evaporate during laser welding and cause problems by forming bubbles at the weld, so welding quality can be ensured by performing laser cleaning step S5, as in embodiments of this disclosure.

[0165] The cover assembly installation step S6 can be a step for installing the cover assembly 300 onto the opening of the housing 200. The cover assembly 300 can be configured to cover the opening of the housing 200. For example, the cover assembly 300 can be positioned on the upper edge of the opening of the housing 200.

[0166] Additionally, in the cover assembly installation step S6, the terminal connection portion 420 of the first current collector 400 can be inserted into the insertion hole H4 of the terminal 330.

[0167] The shell-cover assembly joining step S7 can be a step of welding the wall member 200a of the shell 200 and the outer peripheral surface of the cover assembly 300. For example, the outer peripheral surface of the shell 200 and the inner peripheral surface of the edge of the cover assembly 300 can be joined by welding. In this case, the weld ( Figure 12 Part A) can be positioned along the outer peripheral surface of the upper edge of the housing 200.

[0168] The terminal-first current collector welding step S8 can be a step of welding the terminal 330 of the cover assembly 300 and the first current collector 400. The terminal-first current collector welding step S8 can include a process of performing laser welding on the outside of the terminal 330 to connect the terminal 330 to the first current collector 400. Specifically, the terminal-first current collector welding step S8 can be performed along the edge of the insertion hole H4 of the terminal 330 and the edge of the outer surface of the terminal connection portion 420. The result of this laser welding is the same as described above. Figure 12 The implementation methods shown are the same.

[0169] According to the above-described configuration of this disclosure, since the terminal 330 and the first current collector 400 can be laser-welded to the outside of the battery cell 10, even if spatter is generated during welding, it will not enter the interior of the battery cell 10, thereby minimizing damage to the separator of the electrode assembly 100. Therefore, the lifespan of the battery cell 10 can be increased.

[0170] Furthermore, according to the above-described implementation of this disclosure, when welding the terminal 330, 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.

[0171] In addition, the manufacturing process of the battery cell 10 described above can be performed sequentially, and other processes can be performed between processes.

[0172] Figure 18 This is a schematic diagram illustrating the manufacturing process of a battery cell according to another embodiment of the present disclosure.

[0173] refer to Figure 18 Besides reference Figure 17 In addition to the described method for manufacturing battery cells, another embodiment of the method for manufacturing battery cells according to this disclosure may further include a second uncoated portion pasting step S9 and a housing-second uncoated portion welding step S10.

[0174] Step S9, which involves attaching the second uncoated portion, can be a step of attaching the uncoated portion of the second electrode 120 with adhesive tape. Step S9 may also include using adhesive tape or the like to bond the uncoated portions of the second electrode 120 together. Specifically, if the uncoated portion of the second electrode 120 has multiple segments, the multiple segments can be wrapped with tape to form a single shape. For example, step S9 can be performed before step S3, which involves inserting the electrode assembly.

[0175] The housing-second uncoated portion welding step S10 can be a step of welding the uncoated portion of the closed portion 200b and the second electrode 120 formed on the other side of the housing 200. The housing-second uncoated portion welding step S10 can include a process of performing laser welding to join the uncoated portions of the housing 200 and the second electrode 120 outside the closed portion 200b of the housing. The result of this laser welding is similar to that described above. Figure 13 and Figure 14 The results of the implementation shown are the same.

[0176] For example, the housing-second uncoated portion welding step S10 can be performed after the electrode assembly insertion step S3. Alternatively, preferably, the housing-second uncoated portion welding step S10 can be performed before the electrolyte injection step S4. This allows the internal components of the housing 200 to be secured, thereby allowing the electrolyte to smoothly wet the electrode assembly 100 during electrolyte injection.

[0177] According to this manufacturing method, compared with the traditional battery cell manufacturing method, the insulator insertion step, as well as the edge pressing and rolling steps of the casing 200, can be omitted, thereby simplifying the process and reducing manufacturing costs. Furthermore, since no insulator component is required, the reduction in the number of components also contributes to cost savings.

[0178] Furthermore, eliminating the insulator allows for an increase in the size of the electrode assembly 100 within the housing 200, thereby increasing energy density. For example, based on a 4680 battery cell, the volume of the electrode assembly 100 in the battery cell 10 according to this disclosure can be increased by 1901.73 mm² by eliminating the insulator. 3 .

[0179] Figure 19 This is a diagram schematically illustrating some steps of the manufacturing process of a battery cell according to another embodiment of the present disclosure.

[0180] refer to Figure 19 The method for manufacturing battery cells according to embodiments of the present disclosure may further include a cover assembly step S11. The cover assembly step S11 may be performed before the cover assembly installation step S6.

[0181] In addition, the cover assembly step S11 may include the cover insulating liner connection step P1 and the insulating liner-terminal connection step P2.

[0182] The cap-insulating gasket connection step P1 can be the step of inserting the insulating gasket 320 into the first hole H1 of the cap 310. The shapes of the cap 310 and the insulating gasket 320 are similar to... Figure 6 and Figure 7 The implementation method shown is the same.

[0183] Next, the insulating pad-terminal connection step P2 can be the step of inserting the terminal 330 into the second hole of the insulating pad 320. The shape of the terminal 330 is similar to... Figure 8 The implementation methods shown are the same.

[0184] The result of assembling the cover assembly 300 is the same as described above. Figure 5 The implementation methods shown are the same.

[0185] According to the above-described implementation of this disclosure, the terminal 330 having a first polarity and the cover 310 having a second polarity can be kept in an electrically insulating state. Therefore, the terminal 330 can be used as a first terminal, and the remaining area of ​​the cover assembly 300 (excluding the area occupied by the terminal 330) can be used as a second terminal.

[0186] Therefore, when multiple battery cells 10 are electrically connected, the battery cell 10 according to this disclosure can simplify the electrical connection structure by connecting both the positive and negative terminals in one direction. Furthermore, according to the above-described implementation of this disclosure, the sealing of the housing 200 can be improved by providing an insulating gasket 320.

[0187] Furthermore, according to the above-described configuration of this disclosure, the terminal 330 can be disposed on the insulating pad 320 and exposed to the outside of the cover assembly 300 without being riveted to the second hole H2 of the insulating pad 320. Therefore, when connecting the terminal 330, the riveting process can be eliminated, thereby simplifying the manufacturing process of the battery cell 10, reducing costs, and increasing productivity.

[0188] Furthermore, according to embodiments of this disclosure, the inward protrusion caused by the terminal 330 being riveted to the second hole H2 of the insulating pad 320 can be eliminated. This increases the vertical height of the electrode assembly 100, thereby improving the energy density of the battery cell 10.

[0189] Furthermore, according to another aspect of this disclosure, the cover 310, terminal 330, and insulating pad 320 can be pre-assembled into the cover assembly 300, and then the cover assembly 300 can be coupled to the housing 200, which can simplify the manufacturing process of the battery cell 10, reduce costs, and increase productivity.

[0190] 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 spirit of this disclosure and the equivalent scope of the claims described below.

Claims

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

2. The battery cell according to claim 1, in, The cover includes: An exhaust section is configured to rupture and release the gas generated within the housing when the internal pressure of the housing is greater than or equal to a certain level.

3. The battery cell according to claim 1, in, The insulating liner is configured to protrude further inward than the cover in the vertical direction.

4. The battery cell according to claim 1, in, The insulating pad includes: The first part is configured to form the second hole and support the outer peripheral surface of the terminal, and The second part is configured to project inwardly from the first part in a radial direction and support the inner surface of the terminal.

5. The battery cell according to claim 1, in, The insulating liner includes a third portion configured to support the inner surface of the cover.

6. The battery cell according to claim 1, wherein the battery cell further comprises: A first current collector is disposed on one side of the electrode assembly and configured to be electrically connected to the first electrode.

7. The battery cell according to claim 6, in, The insulating liner is configured to space the cover and the first current collector apart from each other.

8. The battery cell according to claim 6, in, The first current collector includes: An uncoated portion connection is configured to connect to the uncoated portion of the first electrode.

9. The battery cell according to claim 8, in, The first current collector has: An injection hole is formed to pass through the uncoated portion of the connection.

10. The battery cell according to claim 6, in, The first current collector includes a terminal connection portion configured to protrude toward and connect to the terminal.

11. The battery cell according to claim 6, in, The terminal has an insertion hole configured such that at least a portion of the first current collector is inserted into the insertion hole.

12. The battery cell according to claim 11, in, The first weld bead is formed along the edge of the insertion hole and the edge of the outer surface of the first current collector.

13. The battery cell according to claim 1, in, The cover assembly is configured to be connected along the periphery of the wall members of the housing.

14. The battery cell according to claim 1, in, The housing has: The second weld bead is formed when the second electrode is welded to the outer surface of the closed portion.

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

16. A vehicle comprising a battery pack according to claim 15.

17. A method for manufacturing a battery cell, the method comprising the following steps: An electrode assembly is wound around a winding axis, the electrode assembly being constructed by laminating a first electrode, a second electrode, and a diaphragm inserted between the first electrode and the second electrode; A first current collector, configured to be electrically connected to the first electrode, is connected to one side of the electrode assembly; The electrode assembly is inserted into a housing with an opening on one side; Electrolyte is injected through the injection hole of the first current collector; Clean the residual electrolyte on the terminal connection of the first current collector; Install the cover assembly onto the opening of the housing; The wall members of the housing are welded to the outer peripheral surface of the cover assembly; as well as The terminals of the cover assembly are soldered to the terminal connection portion of the first current collector.

18. The method for manufacturing a battery cell according to claim 17, further comprising the following steps: Adhere the uncoated portion of the second electrode; as well as The uncoated portion of the second electrode is welded to a closed portion formed on the other side of the housing.

19. The method for manufacturing a battery cell according to claim 17, the method further comprising: The lid assembly step includes the following steps: Insert the insulating gasket into the first hole of the cover; and Insert the terminal into the second hole of the insulating pad.

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