Battery cell, and battery pack and vehicle comprising same

Abstract

A battery cell, and a battery pack and a vehicle comprising same are disclosed. The battery cell, according to one embodiment of the present invention, comprises: an electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction; a battery can accommodating the electrode assembly and having a first coupling portion formed thereon; and a cap having a second coupling portion formed thereon so as to be coupled to the first coupling portion of the battery can.

Description

Battery cells and battery packs and vehicles containing the same

[0001] This application claims priority to Korean Patent Application No. 10-2024-0087163, filed on July 2, 2024, and Korean Patent Application No. 10-2025-0077296, filed on June 12, 2025, all of which are incorporated herein by reference in their entirety.

[0002] The present invention relates to a battery cell, a battery pack including the same, and a vehicle, and more particularly, to a battery cell capable of easily welding a battery can, and a battery pack including the same and a vehicle.

[0003] Secondary batteries, which have high applicability according to product group and electrical characteristics such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by electrical power sources.

[0004] These secondary batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency because they not only have the primary advantage of drastically reducing the use of fossil fuels, but also have the advantage of producing no byproducts from energy use.

[0005] Commonly used secondary battery types include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells ranges from approximately 2.5 V to 4.5 V.

[0006] Therefore, when a higher output voltage is required, multiple battery cells are connected in series to form a battery module or battery pack. Furthermore, depending on the required charge / discharge capacity, a number of battery cells are connected in parallel to form a battery module or battery pack. Accordingly, the number and electrical connection configuration of battery cells included in a battery module or battery pack can be varied depending on at least one of the required output voltage and charge / discharge capacity.

[0007] Cylindrical, prismatic, and pouch-shaped secondary battery cells are known types. Cylindrical battery cells are formed by interposing a separator, which serves as an insulator, between the positive and negative plates. This separator is then rolled to form a jelly-roll-shaped electrode assembly. This assembly, along with an electrolyte, is then inserted into a battery can to form the battery. Furthermore, cylindrical battery cells may use a current collector to electrically connect the positive and negative plates.

[0008] FIG. 1 is a cross-sectional view according to a first embodiment in which a cap is coupled to a battery can in a conventional cylindrical battery cell, and FIG. 2 is a cross-sectional view according to a second embodiment in which a cap is coupled to a battery can in a conventional cylindrical battery cell.

[0009] Referring to Fig. 1, the cap (1) is welded from the upper side (see arrow) while being in close contact with the side of the battery can (2). However, there is a problem in that it is not easy to make the cap (1) parallel to the battery can (2), resulting in many welding defects.

[0010] Referring to Fig. 2, the cap (1) is welded from the side (see arrow) in contact with the upper side of the battery can (2), but a gap is created in the welded area by simply placing the cap (1) on the upper side of the battery can (2), and this method also has the problem of causing many welding defects.

[0011] Accordingly, the technical problem to be solved by the present invention is to provide a battery cell in which welding of a battery can and a cap can be performed smoothly and easily, and a battery pack and a vehicle including the same.

[0012] In addition, the present invention provides a battery cell and a battery pack and a vehicle including the same, which can reduce welding defects in battery cans and caps and improve the quality of battery cells.

[0013] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0014] According to one aspect of the present invention, a battery cell may be provided, including an electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction; a battery can in which the electrode assembly is accommodated and in which a first joint portion is formed; and a cap having a second joint portion formed so as to be joined to the first joint portion of the battery can.

[0015] In one embodiment, the first coupling portion may be formed as a coupling groove, and the second coupling portion may be formed as a coupling protrusion.

[0016] In one embodiment, the first coupling portion may be formed as a coupling protrusion, and the second coupling portion may be formed as a coupling groove.

[0017] In one embodiment, when the first coupling portion is a coupling groove, the coupling groove may include a first straight portion and a first inclined portion formed to be inclined downward from the first straight portion.

[0018] In one embodiment, when the second connecting portion is a connecting projection, the connecting projection may include a second straight portion that can be in contact with the first straight portion, and a second inclined portion that can be in contact with the first inclined portion and is formed to be inclined downward from the second straight portion.

[0019] In one embodiment, the battery can and the cap can be joined by welding with the first straight portion in contact with the second straight portion and the first inclined portion in contact with the second inclined portion.

[0020] In one embodiment, the first straight portion may be formed transversely inwardly from a side surface of the battery can, and the first inclined portion may be formed to be inclined downward from an inner end of the first straight portion.

[0021] In one embodiment, the second straight portion may be formed transversely outward from the side of the cap, and the second inclined portion may be formed to be inclined downward from the outer end of the second straight portion.

[0022] In one embodiment, a first attachment portion may be attached to at least one of the first straight portion and the first inclined portion.

[0023] In one embodiment, the first attachment portion may be a double-sided tape.

[0024] In one embodiment, a second attachment portion may be attached to at least one of the second straight portion and the second inclined portion.

[0025] In one embodiment, the second attachment portion may be a double-sided tape.

[0026] Meanwhile, according to another aspect of the present invention, a battery pack including at least one of the above-described battery cells may be provided, and further, a vehicle including at least one of the above-described battery cells may be provided.

[0027] Embodiments of the present invention have the effect of enabling smooth and easy welding of a battery can and a cap.

[0028] Additionally, this has the effect of reducing welding defects in the battery can and cap and improving the quality of the battery cell.

[0029] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0031] FIG. 1 is a cross-sectional view according to a first embodiment in which a cap is coupled to a battery can in a conventional cylindrical battery cell.

[0032] FIG. 2 is a cross-sectional view according to a second embodiment in which a cap is coupled to a battery can in a conventional cylindrical battery cell.

[0033] Figure 3 is a cross-sectional view of a battery cell according to one embodiment of the present invention.

[0034] FIG. 4 is a cross-sectional view showing a battery cell according to one embodiment of the present invention in which a first connecting portion of a battery can and a second connecting portion of a cap are separated.

[0035] Fig. 5 is a cross-sectional view showing the first joint of the battery can and the second joint of the cap in Fig. 4 joined together, and is an enlarged view of part A in Fig. 3.

[0036] Fig. 6 is a drawing according to the first modified embodiment of Fig. 4.

[0037] Fig. 7 is a drawing according to a second modified embodiment of Fig. 4.

[0038] Fig. 8 is a cross-sectional view showing the first joint of the battery can and the second joint of the cap in Fig. 7 joined together.

[0039] FIG. 9 is a schematic diagram showing the configuration of a battery pack including battery cells according to each embodiment of the present invention.

[0040] FIG. 10 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.

[0041] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Terms or words used in this specification and claims should not be interpreted as limited to their conventional or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to best explain his or her own invention. Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention, and various equivalents and modifications may exist as of the time of this application.

[0042] In the drawings, the sizes of each component or specific parts of that component are exaggerated, omitted, or schematically illustrated for convenience and clarity of explanation. Therefore, the size of each component does not entirely reflect its actual size. If a detailed description of a related known function or configuration is deemed to unnecessarily obscure the gist of the present invention, such description will be omitted.

[0043] The term 'joint' or 'connection' as used herein includes not only cases where one member is directly joined or directly connected to another member, but also cases where one member is indirectly joined or indirectly connected to another member through a connecting member.

[0044] Meanwhile, the common elements described in one embodiment of the present invention can also be applied to other embodiments. For example, the common elements described in the first embodiment of the second embodiment can be replaced with the description of the first embodiment, but the common elements can also be applied to the second embodiment. Furthermore, the elements described in the second embodiment that are applicable to the first embodiment can also be applied to the first embodiment. The same applies to other embodiments.

[0045] FIG. 3 is a cross-sectional view of a battery cell according to one embodiment of the present invention, FIG. 4 is a cross-sectional view of a battery cell according to one embodiment of the present invention in which a first connecting portion of a battery can and a second connecting portion of a cap are separated, and FIG. 5 is a cross-sectional view of a battery cell in which the first connecting portion of the battery can and the second connecting portion of the cap are connected in FIG. 4, and is an enlarged view of part A of FIG. 3.

[0046] Referring to FIG. 3, a battery cell (10) according to one embodiment of the present invention includes an electrode assembly (100), a battery can (200), and a cap (600).

[0047] The electrode assembly (100) has a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive and negative electrode plates are wound in one direction. In addition, a central hole is formed in the center of the electrode assembly (100), and can be formed in a jelly roll type.

[0048] For example, the electrode assembly (100) can be manufactured by winding a laminate formed by sequentially stacking a negative electrode plate, a separator, a positive electrode plate, and a separator at least once. Here, the positive electrode plate and the negative electrode plate can be formed in a sheet shape.

[0049] That is, the electrode assembly (100) applied to the present embodiment may be a coiled type electrode assembly (100). In this case, an additional separator may be provided on the outer circumferential surface of the electrode assembly (100) for insulation from the battery can (200). That is, the electrode assembly (100) may have a coiled structure well known in the related technical field without limitation.

[0050] A positive electrode plate may have a positive electrode active material applied to one or both sides thereof, and a first non-coated portion on which the positive electrode active material is not applied may be formed at an end of the positive electrode plate. As described above, a positive electrode plate having a first non-coated portion formed thereon may be provided, but a battery cell (10) according to an embodiment of the present invention includes an embodiment of a positive electrode plate having no first non-coated portion formed thereon. However, for convenience of explanation, the following description will focus on a case where the first non-coated portion is formed on the positive electrode plate. The first non-coated portion may be exposed to the outside of the separator while forming a plurality of winding turns based on the center of the electrode assembly (100), and may be used as an electrode tab in itself.

[0051] The negative electrode plate may have a negative active material applied to one or both sides thereof, and a second non-coated portion on which the negative active material is not applied may be formed at an end of the negative electrode plate. As described above, a negative electrode plate having a second non-coated portion formed thereon may be provided, but the battery cell (10) according to an embodiment of the present invention includes an embodiment of a negative electrode plate having no second non-coated portion formed thereon. However, for convenience of explanation, the following description will focus on a case where the second non-coated portion is formed on the negative electrode plate. The second non-coated portion may be exposed to the outside of the separator while forming a plurality of winding turns based on the center of the electrode assembly (100), and may be used as an electrode tab in itself.

[0052] That is, at least one of the positive and negative electrode plates may include a non-coated portion, which is not coated with an active material, at a long end in the winding direction. In addition, the first non-coated portion and the second non-coated portion may be configured to face in opposite directions.

[0053] Here, the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate can be used without limitation as long as they are active materials known in the art.

[0054] In addition, the separation membrane may be a porous polymer film, for example, a porous polymer film made of a polyolefin polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene / butene copolymer, an ethylene / hexene copolymer, an ethylene / methacrylate copolymer, etc., which may be used alone or in a laminated manner.

[0055] As another example, the separator may be a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fiber, polyethylene terephthalate fiber, etc.

[0056] At least one surface of the membrane may include a coating layer of inorganic particles. Furthermore, the membrane itself may be formed of a coating layer of inorganic particles. The particles constituting the coating layer may have a structure in which they are bound to a binder such that an interstitial volume exists between adjacent particles.

[0057] In addition, the center hole of the electrode assembly (100) is also used for welding the cell terminal (400, positive terminal) and the positive current collector (300). That is, the electrode assembly (100) can be configured to weld the cell terminal (400) and the positive current collector (300) by irradiating a laser through the center hole.

[0058] Referring to FIG. 3, a through hole is formed in the battery can (200) and an electrode assembly (100) is stored therein. For example, the battery can (200) is formed in a cylindrical shape, and the electrode assembly (100) is stored inside the battery can (200) and can be electrically connected to the negative electrode plate of the electrode assembly (100). Accordingly, the battery can (200) can have the same polarity as the negative electrode plate, i.e., a negative electrode.

[0059] Referring to FIG. 4, a first connecting portion (210) is formed in the battery can (200). Then, the first connecting portion (210) is connected to a second connecting portion (610) of the cap (600). This will be described later.

[0060] The diameter of the battery can (200) is formed to be larger than the diameter of the electrode assembly (100).

[0061] And, if the size of the electrode assembly (100) is increased while the size of the battery can (200) is determined according to the standard, the total capacity of the battery cell (10) increases, but the gap between the battery can (200) and the electrode assembly (100) decreases, so it is necessary to appropriately adjust the size of the insulator (700) described below.

[0062] The battery can (200) may be formed with a closed portion and an open portion positioned so as to face each other. The electrode assembly (100) is housed through the open portion formed in the battery can (200), and the electrolyte is also injected through the open portion formed in the battery can (200).

[0063] That is, the battery can (200) is a roughly cylindrical container with an opening formed therein, and may be made of a conductive material such as metal, for example. The material of the battery can (200) may be made of a conductive metal such as aluminum, steel, stainless steel, etc., but is not limited thereto.

[0064] In addition, a closed portion may be formed in the battery can (200). The closed portion may be partially formed on the opposite side of the open portion. A through hole is formed in the closed portion. Then, as shown in FIG. 3, a cell terminal (400) is coupled to the through hole, and the cell terminal (400) is electrically connected to the positive electrode collector plate (300) through the through hole. And, referring to FIG. 3, an insulator (700) may be interposed between the battery can (200) and the positive electrode collector plate (300).

[0065] The positive electrode collector (300) is electrically connected to the positive electrode plate, and for example, referring to FIG. 3, the positive electrode collector (300) is connected to the positive electrode plate of the electrode assembly (100).

[0066] The positive electrode collector (300) is made of a conductive metal material and is connected to the first non-coated portion of the electrode assembly (100). The positive electrode collector (300) can be connected to a bonding surface formed by bending an end of the first non-coated portion in a direction parallel to the positive electrode collector (300). The bending direction of the first non-coated portion may be, for example, a direction toward the winding center of the electrode assembly (100).

[0067] When the first non-coated portion has such a folded shape, the space occupied by the first non-coated portion can be reduced, thereby improving energy density. In addition, the increased bonding area between the first non-coated portion and the positive electrode current collector (300) can lead to improved bonding strength and reduced resistance.

[0068] The cell terminal (400) is made of a conductive metal material and is coupled to a through hole formed in the closed portion of the battery can (200) and is electrically connected to the positive electrode collector plate (300) through the through hole. In addition, the cell terminal (400) is electrically connected to the positive electrode plate of the electrode assembly (100) through the positive electrode collector plate (300), thereby having a positive polarity.

[0069] That is, the cell terminal (400) can function as a positive terminal. In addition, the battery can (200) is electrically connected to the negative plate of the electrode assembly (100) as described above, thereby having a negative polarity.

[0070] Referring to FIG. 3, the negative electrode collector plate (500) is electrically connected to the negative electrode plate. The negative electrode collector plate (500) may be connected to the second non-conductive portion of the electrode assembly (100). Here, the negative electrode collector plate (500) is made of a conductive metal material such as aluminum, steel, copper, nickel, etc., and may be electrically connected to the second non-conductive portion of the negative electrode plate.

[0071] The negative electrode collector plate (500) can be electrically connected to the battery can (200). As a result, the battery can (200) can have a negative polarity. In addition, at least a portion of the edge portion of the negative electrode collector plate (500) can be directly welded to the inner wall surface of the battery can (200).

[0072] The insulator (700) is interposed between the battery can (200) and the positive electrode collector plate (300) to prevent contact between the positive electrode portion of the electrode assembly and the negative electrode portion of the battery can (200), thereby blocking electrical connection. Therefore, the insulator (700) may be made of a material having electrical insulation performance. The insulator (700) may have a hollow portion formed in the center thereof, and the cell terminal (400) may be electrically connected to the positive electrode collector plate (300) through the hollow portion formed in the insulator (700).

[0073] Referring to FIG. 3, the cap (600) is configured to close the opening of the battery can (200). Here, although a vent notch is formed in the cap (600), this is only one embodiment, and the vent notch may be formed in the cap (600), or may be formed in the battery can (200) close to the position where the cell terminal (400) is formed. That is, the venting direction may be toward the cell terminal (400) or may be opposite to the cell terminal (400), and the formation position of the vent notch may vary depending on the venting direction.

[0074] The cap (600) is directly connected to the battery can (200). Referring to FIG. 3, the cap (600) can be connected to the upper side of the battery can (200). Here, the cap (600) can be connected to the battery can (200) in various ways, for example, by various welding methods.

[0075] However, as described above, there is a problem in that many welding defects occur in the cases of FIGS. 1 and 2.

[0076] Therefore, in the case of the battery cell (10) according to one embodiment of the present invention, in order to prevent the aforementioned welding defect, a second connecting portion (610) is formed on the cap (600) so as to be connected to the first connecting portion (210) of the battery can (200), and the first connecting portion (210) and the second connecting portion (610) are connected to each other.

[0077] That is, a first connecting portion (210) is formed in the battery can (200), a second connecting portion (610) is formed in the cap (600), and the second connecting portion (610) of the cap (600) is connected to the first connecting portion (210) of the battery can (200).

[0078] And, in this way, since welding is performed while the battery can (200) and the cap (600) are connected through the first connecting portion (210) and the second connecting portion (610), welding of the battery can (200) and the cap (600) can be performed smoothly and easily, and furthermore, through this, there is an effect of reducing welding defects of the battery can (200) and the cap (600) and improving the quality of the battery cell (10).

[0079] Referring to FIGS. 4 and 5, the first coupling portion (210) may be formed as a coupling groove, and the second coupling portion (610) may be formed as a coupling protrusion.

[0080] When the first coupling portion (210) is a coupling groove, the coupling groove may include a first straight portion (211) and a first inclined portion (212) formed to be inclined downward from the first straight portion (211).

[0081] Referring to FIG. 4, the first straight portion (211) may be formed horizontally inward from the side of the battery can (200) based on FIG. 4, and the first inclined portion (212) may be formed to be inclined downward from the inner end of the first straight portion (211).

[0082] That is, for example, the coupling groove of the first coupling portion (210) may be formed so that the cross-section is approximately triangular in shape and faces inward from the side of the battery can (200). However, the shape of the cross-section of the first coupling portion (210) is not limited to a triangle.

[0083] And, when the second connecting portion (610) is a connecting projection, the connecting projection may include a second straight portion (611) that can be in contact with the first straight portion (211), and a second inclined portion (612) that can be in contact with the first inclined portion (212) and is formed to be inclined downward from the second straight portion (611).

[0084] Referring to FIG. 4, the second straight portion (611) may be formed horizontally outward from the side of the cap (600) based on FIG. 4, and the second inclined portion (612) may be formed to be inclined downward from the outer end of the second straight portion (611).

[0085] That is, for example, the coupling protrusion of the second coupling portion (610) may be formed to protrude outward from the side of the cap (600) in a cross-section that is approximately triangular in shape. However, the shape of the cross-section of the second coupling portion (610) is not limited to a triangle.

[0086] And, as shown in Fig. 5, the first straight portion (211) can be in contact with the second straight portion (611), and the first inclined portion (212) can be in contact with the second inclined portion (612), and in this state, welding (see arrows in Fig. 5) can be performed from the upper side. That is, welding is performed in a state where the first joining portion (210) of the battery can (200) and the second joining portion (610) of the cap (600) are joined.

[0087] Fig. 6 is a drawing according to the first modified embodiment of Fig. 4.

[0088] Referring to Fig. 6, a first attachment portion (213) may be attached to at least one of the first straight portion (211) and the first inclined portion (212). Here, the first attachment portion (213) may be a double-sided tape, but is not limited thereto.

[0089] In addition, a second attachment portion (613) may be attached to at least one of the second straight portion (611) and the second inclined portion (612). Here, the second attachment portion (613) may be a double-sided tape, but is not limited thereto.

[0090] In FIG. 6, the first attachment part (213) is attached to the first inclined part (212), and the second attachment part (613) is attached to the second inclined part (612). However, if the first attachment part (213) and the second attachment part (613) are double-sided tapes, the attachment part may be attached to only one of the first inclined part (212) and the second inclined part (612).

[0091] And, in FIG. 6, the first attachment part (213) is not attached to the first straight part (211) and the second attachment part (613) is not attached to the second straight part (611), but the first attachment part (213) can be attached to the first straight part (211) and the second attachment part (613) can be attached to the second straight part (611).

[0092] FIG. 7 is a drawing according to a second modified embodiment of FIG. 4, and FIG. 8 is a cross-sectional view showing the first connecting portion of the battery can and the second connecting portion of the cap in FIG. 7 connected.

[0093] Referring to FIGS. 7 and 8, the first coupling portion (210) may be formed as a coupling protrusion, and the second coupling portion (610) may be formed as a coupling groove. That is, the first coupling portion (210) formed on the battery can (200) may be a coupling protrusion, and the second coupling portion (610) of the cap (600) may be a coupling groove. In addition, as shown in FIG. 8, the coupling protrusion, which is the first coupling portion (210), may be coupled to the coupling groove, which is the second coupling portion (610), and may be joined by welding.

[0094] FIG. 9 is a schematic diagram showing the configuration of a battery pack including battery cells according to each embodiment of the present invention.

[0095] Referring to FIG. 9, a battery pack (20) according to one embodiment of the present invention may include one or more battery cells (10) according to each embodiment of the present invention as described above. In addition, the battery pack (20) may further include a pack case (21) for storing the battery cells (10), and various devices for controlling charging and discharging of the battery cells (10), such as a BMS, a current sensor, a fuse, etc.

[0096] FIG. 10 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.

[0097] Referring to FIG. 10, a vehicle (30) according to one embodiment of the present invention may include one or more battery cells (10) according to each embodiment described above or one or more battery packs (20) according to each embodiment. Here, the vehicle (30) includes various types of vehicles that are designed to use electricity, such as electric vehicles or hybrid vehicles.

[0098] In this specification, when terms indicating directions such as up, down, left, and right are used, these terms are only for convenience of explanation, and it is obvious to those skilled in the art that these terms may vary depending on the location of the target object or the location of the observer.

[0099] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and those skilled in the art to which the present invention pertains may make various modifications and variations within the scope of the technical spirit of the present invention and the equivalent scope of the claims to be described below. Therefore, the embodiments disclosed above should be considered from an illustrative rather than a restrictive perspective. In other words, the true scope of the technical spirit of the present invention is set forth in the claims, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

[0100] The present invention relates to a battery cell and a battery pack and an automobile including the same, and is particularly applicable to industries related to secondary batteries.

Claims

1. An electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction; A battery can in which the electrode assembly is housed and a first joint is formed; and A battery cell comprising a cap having a second connecting portion formed thereon so as to be connected to the first connecting portion of the battery can.

2. In paragraph 1, A battery cell characterized in that the first coupling portion is a coupling groove and the second coupling portion is formed as a coupling protrusion.

3. In paragraph 1, A battery cell characterized in that the first coupling portion is a coupling projection and the second coupling portion is formed as a coupling groove.

4. In paragraph 2, A battery cell characterized in that, when the first connecting portion is a connecting groove, the connecting groove includes a first straight portion and a first inclined portion formed to be inclined downward from the first straight portion.

5. In paragraph 4, A battery cell characterized in that, when the second connecting portion is a connecting projection, the connecting projection includes a second straight portion that can be in contact with the first straight portion, and a second inclined portion that can be in contact with the first inclined portion and is formed to be inclined downward from the second straight portion.

6. In paragraph 5, A battery cell characterized in that the battery can and the cap are joined by welding in a state in which the first straight portion is in contact with the second straight portion and the first inclined portion is in contact with the second inclined portion.

7. In paragraph 4, A battery cell characterized in that the first straight portion is formed horizontally inward from the side of the battery can, and the first inclined portion is formed to be inclined downward from the inner end of the first straight portion.

8. In paragraph 5, A battery cell characterized in that the second straight portion is formed horizontally outward from the side of the cap, and the second inclined portion is formed to be inclined downward from the outer end of the second straight portion.

9. In paragraph 4, A battery cell characterized in that a first attachment portion is attached to at least one of the first straight portion and the first inclined portion.

10. In paragraph 9, A battery cell characterized in that the first attachment portion is a double-sided tape.

11. In paragraph 5, A battery cell characterized in that a second attachment portion is attached to at least one of the second straight portion and the second inclined portion.

12. In paragraph 11, A battery cell characterized in that the second attachment portion is a double-sided tape.

13. A battery pack comprising at least one battery cell according to any one of claims 1 to 12.

14. A vehicle comprising at least one battery cell according to any one of claims 1 to 12.

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