Battery cell and battery module including same

Abstract

The battery cell according to an embodiment of the present invention comprises: an electrode assembly in which a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode are successively stacked multiple times; and a prismatic case in which the electrode assembly is contained. The battery cell comprises a first electrode terminal electrically connected to the first electrode and a second electrode terminal electrically connected to the second electrode. The first electrode terminal and the second electrode terminal extend in opposite directions with reference to the longitudinal direction of the electrode assembly. The first electrode terminal and the second electrode terminal protrude toward the outside of the prismatic case from both ends of the prismatic case, respectively.

Description

Battery cells and battery modules containing the same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0025652, filed February 22, 2024, and Korean Patent Application No. 10-2025-0016805, filed February 10, 2025, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery cell and a battery module including the same, and more particularly, to a battery cell including a stacked electrode assembly built into a square case, wherein first electrode terminals and second electrode terminals protrude in both directions, and a battery module including the same.

[0004] Secondary batteries, which boast high electrical properties such as high energy density and easy applicability across a wide range of product groups, are widely used not only in portable devices but also in electric or hybrid vehicles powered by electrical power sources, as well as in power storage devices. These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only for their primary advantage of dramatically reducing fossil fuel use, but also because they produce no byproducts from energy use.

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0006] In general, lithium secondary batteries can be classified into cylindrical or square secondary batteries in which the electrode assembly is built into a metal can, and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0007] In addition, the electrode assembly can be roughly classified into a jellyroll type in which a separator is interposed between sheet-shaped positive and negative electrodes coated with active materials and wound, a stack type in which a plurality of positive and negative electrodes are sequentially stacked with a separator interposed between them, and a stack & folding type in which stack-type unit cells are wound with a long separator film.

[0008] In this way, lithium secondary batteries are attempting various combinations depending on the shape of the outer material and the electrode assembly accommodated inside, and through this, the demand for implementing high battery capacity and energy density is increasing.

[0009] The problem to be solved by the present invention relates to a battery cell including a stacked electrode assembly built into a square case, wherein a first electrode terminal and a second electrode terminal protrude in both directions, a battery cell including the same, and a battery module including the same.

[0010] The problems to be solved by the present invention are not limited to the problems described above, and problems not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0011] According to one embodiment of the present invention, a battery cell comprises: an electrode assembly in which a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode are sequentially laminated multiple times; and a square case housing the electrode assembly, and includes a first electrode terminal electrically connected to the first electrode and a second electrode terminal electrically connected to the second electrode, wherein the first electrode terminal and the second electrode terminal extend in opposite directions based on a longitudinal direction of the electrode assembly, and the first electrode terminal and the second electrode terminal protrude outward from each end of the square case.

[0012] The first electrode terminal and the second electrode terminal may each have a planar structure.

[0013] One end of the first electrode terminal electrically connected to the first electrode and the other end of the first electrode terminal protruding outwardly of the square case may be positioned on the same plane, and one end of the second electrode terminal electrically connected to the second electrode and the other end of the second electrode terminal protruding outwardly of the square case may be positioned on the same plane.

[0014] The first electrode may include a first electrode current collector and a first electrode active material layer formed on at least one of the upper and lower surfaces of the first electrode current collector, and the second electrode may include a second electrode active material layer formed on at least one of the upper and lower surfaces of the second electrode current collector.

[0015] The first electrode may include a first electrode tab, which is a region on at least one of the upper and lower surfaces of one end of the first electrode current collector, where the first electrode active material layer is not formed, and the second electrode may include a second electrode tab, which is a region on at least one of the upper and lower surfaces of one end of the second electrode current collector, where the second electrode active material layer is not formed.

[0016] The first electrode terminal may be electrically connected to the first electrode tab, and the second electrode terminal may be electrically connected to the second electrode tab.

[0017] The width of the first electrode terminal may be equal to or greater than the width of the first electrode tab, and the width of the second electrode terminal may be equal to or greater than the width of the second electrode tab.

[0018] The width of the first electrode tab may be 50% or more and 100% or less of the width of the first electrode active material layer, and the width of the second electrode tab may be 50% or more and 100% or less of the width of the second electrode active material layer.

[0019] The above square case may be of a can type.

[0020] A first terminal insertion hole and a second terminal insertion hole may be formed at each end of the square case, and the first electrode terminal may pass through the first terminal insertion hole and protrude outward from the square case, and the second electrode terminal may pass through the second terminal insertion hole and protrude outward from the square case.

[0021] The battery cell may further include a first gasket portion that seals between the first terminal insertion hole and the first electrode terminal, and a second gasket portion that seals between the second terminal insertion hole and the second electrode terminal.

[0022] The first gasket portion may extend along between the first terminal insertion hole and the first electrode terminal, and the second gasket portion may extend along between the second terminal insertion hole and the second electrode terminal.

[0023] It may further include a first sealing portion and a second sealing portion, which are film members that seal between the first terminal insertion hole and the first electrode terminal and between the second terminal insertion hole and the second electrode terminal, respectively.

[0024] A battery module according to another embodiment of the present invention may include the battery cell described above.

[0025] According to embodiments, the battery cell of the present invention and the battery module including the same may include a stacked electrode assembly built into a square case, thereby enabling higher capacity implementation as the internal space utilization rate is further improved.

[0026] In addition, the battery cell of the present invention and the battery module including the same have the first electrode terminal and the second electrode terminal protruding in both directions, so that the assembly process and parts between the electrode current collector and the electrode terminal can be simplified, and the dead space inside the battery cell can also be minimized.

[0027] The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0028] FIG. 1 is a drawing showing a battery cell according to one embodiment of the present invention.

[0029] Fig. 2 is an exploded perspective view of a square case with a structure in which the electrode assembly included in the battery cell of Fig. 1 is omitted.

[0030] FIG. 3 is a top view showing an electrode assembly included in the battery cell of FIG. 1.

[0031] FIG. 4 is a drawing showing a first electrode, a second electrode, and a separator included in the electrode assembly of FIG. 3.

[0032] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0033] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0034] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0035] Additionally, throughout the specification, whenever a part is said to “include” a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0036] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0037] Hereinafter, a battery cell (100) according to one embodiment of the present invention will be described.

[0038] FIG. 1 is a drawing showing a battery cell according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of a square case with a structure in which the electrode assembly included in the battery cell of FIG. 1 is omitted. FIG. 3 is a top view showing the electrode assembly included in the battery cell of FIG. 1. FIG. 4 is a drawing showing a first electrode, a second electrode, and a separator included in the electrode assembly of FIG. 3.

[0039] Referring to FIGS. 1 and 3, a battery cell (100) according to one embodiment of the present invention includes an electrode assembly (110) in which a first electrode (130), a second electrode (150), and a separator interposed between the first electrode (130) and the second electrode (150) are sequentially laminated multiple times; and a square case (200) housing the electrode assembly (110). Here, the square case (200) can accommodate an electrolyte together with the electrode assembly (110) therein.

[0040] Referring to FIG. 3, the electrode assembly (110) may be a stacking type electrode assembly in which a first electrode (130), a second electrode (150), and a separator (170) interposed between the first electrode (130) and the second electrode (150) are alternately stacked. However, the present invention is not limited thereto, and in a structure in which the first electrode (130) and the second electrode (150) are stacked, the separator (170) may be interposed between the first electrode (130) and the second electrode (150), and may be a stacking-folding type electrode assembly in which the separator is folded in a form that surrounds the first electrode (130) and / or the second electrode (150).

[0041] Accordingly, the battery cell (100) according to the present embodiment includes an electrode assembly (110) in which a first electrode (130), a second electrode (150), and a separator interposed between the first electrode (130) and the second electrode (150) are sequentially laminated multiple times, unlike a jelly-roll type electrode assembly included in a conventional square battery, so that more parallel connections can be made between the electrodes, thereby effectively implementing a reduction in resistance, and there is an advantage in that the space utilization rate and battery capacity inside the square case (200) can be further improved.

[0042] Referring to FIGS. 3 and 4, the first electrode (130) may include a first electrode current collector (131) and a first electrode active material layer (135) formed on at least one of the upper and lower surfaces of the first electrode current collector (131), and the second electrode (150) may include a second electrode current collector (151) and a second electrode active material layer (155) formed on at least one of the upper and lower surfaces of the second electrode current collector (151). For example, as shown in FIGS. 3 and 4, the first electrode (130) may include a first electrode active material layer (135) formed on the first electrode current collector (131) and the upper and lower surfaces of the first electrode current collector (131), respectively, and the second electrode (150) may include a second electrode active material layer (155) formed on the second electrode current collector (151) and the upper and lower surfaces of the second electrode current collector (151), respectively.

[0043] Here, the first electrode (130) may be a positive electrode and the second electrode (150) may be a negative electrode. When the first electrode (130) is a positive electrode, the first electrode current collector (131) may correspond to a positive electrode current collector, and the first electrode active material layer (135) may correspond to a positive electrode active material layer. In addition, when the second electrode (150) is a negative electrode, the second electrode current collector (151) may correspond to a negative electrode current collector, and the second electrode active material layer (155) may correspond to a negative electrode active material layer. However, the present invention is not limited thereto, and the opposite case may also be included in the present embodiment.

[0044] The first electrode (130) may include a first electrode tab (131t), and the second electrode (150) may include a second electrode tab (151t). More specifically, the first electrode tab (131t) is a region on at least one of the upper and lower surfaces of the first electrode current collector (131) where the first electrode active material layer (135) is not formed, and may be positioned at one end of the first electrode current collector (131). In addition, the second electrode tab (151t) is a region on at least one of the upper and lower surfaces of the second electrode current collector (151) where the second electrode active material layer (155) is not formed, and may be positioned at one end of the second electrode current collector (151).

[0045] For example, as shown in FIGS. 3 and 4, the first electrode tab (131t) is a region where the first electrode active material layer (135) is not formed on either the upper or lower surface of the first electrode current collector (131), and may be positioned at one end of the first electrode current collector (131). In addition, the second electrode tab (151t) is a region where the second electrode active material layer (155) is not formed on either the upper or lower surface of the second electrode current collector (151), and may be positioned at one end of the second electrode current collector (151).

[0046] For example, the width (d2) of the first electrode tab (131t) may be 50% or more and 100% or less of the width (d3) of the first electrode active material layer (135). More preferably, the width (d2) of the first electrode tab (131t) may be the same as the width (d3) of the first electrode active material layer (135). More specifically, the width (d3) of the first electrode active material layer (135) may refer to the width of the portion of the first electrode current collector (131) where the first electrode active material layer (135) is formed. This can be explained in the same way for the second electrode tab (151t).

[0047] Accordingly, in the battery cell (100) according to the present embodiment, the first electrode tab (131t) and the second electrode tab (151t) each have a relatively wide width, so that the components of the battery cell can be prevented from deteriorating due to heat accumulation caused by a resistance increase factor such as rapid charging at high current.

[0048] Referring to FIGS. 1 and 3, the battery cell (100) according to the present embodiment may include a first electrode terminal (310) electrically connected to a first electrode (130) and a second electrode terminal (350) electrically connected to a second electrode (150). For example, when the first electrode (130) is a positive electrode, the first electrode terminal (310) may be a positive terminal, and when the second electrode (150) is a negative electrode, the second electrode terminal (350) may be a negative terminal. However, the present invention is not limited thereto, and the opposite case may also be included in the present embodiment.

[0049] For example, as shown in FIGS. 1 and 3, in the battery cell (100) according to the present embodiment, the first electrode terminal (310) and the second electrode terminal (350) may each have a planar structure. In other words, the first electrode terminal (310) and the second electrode terminal (350) may be flat terminals.

[0050] That is, one end of the first electrode terminal (310) electrically connected to the first electrode (130) and the other end of the first electrode terminal (310) protruding outwardly from the square case (200) may be positioned on the same plane, and one end of the second electrode terminal (350) electrically connected to the second electrode (150) and the other end of the second electrode terminal (350) protruding outwardly from the square case (200) may be positioned on the same plane.

[0051] More specifically, the first electrode terminal (310) may be electrically connected to the first electrode tab (131t) of the first electrode (130), and the second electrode terminal (350) may be electrically connected to the second electrode tab (151t) of the second electrode (150). For example, the first electrode terminal (310) and the first electrode tab (131t) may be welded to each other, and the second electrode terminal (350) and the second electrode tab (151t) may be welded to each other.

[0052] Referring to FIG. 3, in the battery cell (100) according to the present embodiment, a plurality of first electrode tabs (131t) may be stacked on the upper and lower surfaces of the first electrode terminal (310), and the surfaces where each of the first electrode tabs (131t) contacts each other may also be electrically connected to each other. In addition, a plurality of second electrode tabs (151t) may be stacked on the upper and lower surfaces of the second electrode terminal (350), and the surfaces where each of the second electrode tabs (151t) contacts each other may also be electrically connected to each other. For example, the surfaces where each of the first electrode tabs (131t) contacts each other may be welded to each other, and the surfaces where each of the second electrode tabs (151t) contacts each other may be welded to each other.

[0053] Accordingly, since the battery cell (100) according to the present embodiment has a planar structure at one end of the first electrode terminal (310) electrically connected to the first electrode tab (131t) included in the first electrode (130), the surface where the first electrode tab (131t) and the first electrode terminal (310) come into contact with each other can be secured relatively wide, thereby minimizing heat generated during rapid charging and providing advantages such as delayed cell deterioration and improved durability. This can be equally explained for the second electrode (150) and the second electrode terminal (350).

[0054] In addition, in the battery cell (100) according to the present embodiment, the first electrode tab (131t) included in the first electrode (130) and one end of the first electrode terminal (310) are directly electrically connected to each other, so that no additional component is required between the first electrode tab (131t) and the first electrode terminal (310), and there is an advantage in that the generation of interface resistance due to the additional component can be minimized through a simplified electrical connection structure. This can be equally explained for the second electrode (150) and the second electrode terminal (350).

[0055] Referring to FIGS. 1 and 3, the battery cell (100) according to the present embodiment may have the first electrode terminal (310) and the second electrode terminal (350) extend in opposite directions based on the longitudinal direction of the electrode assembly (110). That is, the battery cell (100) according to the present embodiment may correspond to a bidirectional battery cell in which the positive terminal and the negative terminal protrude in opposite directions.

[0056] Accordingly, in the battery cell (100) according to the present embodiment, the first electrode terminal (310) and the second electrode terminal (350) protrude in both directions, so that the assembly process and components for forming an electrical connection structure between the electrode tabs (131t, 151t) and the electrode terminals (310, 350) can be simplified, and the dead space inside the battery cell (100) can also be minimized.

[0057] In addition, the first electrode terminal (310) and the second electrode terminal (350) protrude outward from each end of the square case (200). Here, the both ends of the square case (200) may refer to both sides of the square case (200) positioned based on the longitudinal direction of the electrode assembly (110). In addition, the first electrode terminal (310) and the second electrode terminal (350) protruding outward from the square case (200) may be electrically connected to electrical elements external to the battery cell (100), respectively.

[0058] Referring to FIGS. 1 and 4, in the battery cell (100) according to the present embodiment, the width (d1) of the first electrode terminal (310) may be equal to or greater than the width (d2) of the first electrode tab (131t). The same can be said for the second electrode terminal (350) and the second electrode tab (151t).

[0059] Accordingly, in the battery cell (100) according to the present embodiment, the width (d1) of the first electrode terminal (310) and the second electrode terminal (350) have a relatively wide width compared to the width (d2) of the first electrode tab (131t) and the second electrode tab (151t), respectively, so that the components of the battery cell can be more effectively prevented from deteriorating due to heat accumulation caused by a resistance increase factor such as rapid charging at high current.

[0060] Referring to FIGS. 1 and 2, the square case (200) may refer to a hexahedral case having a space capable of accommodating an electrode assembly (110). In other words, the square case (200) may be formed in a can type. For example, the square case (200) may be formed of a heat-resistant metal such as aluminum (Al), nickel (Ni), iron (Fe), titanium (Ti), chromium (Cr), tungsten, etc. As another example, the square case (200) may be formed of a heat-resistant metal such as aluminum (Al), nickel (Ni), iron (Fe), titanium (Ti), chromium (Cr), tungsten, etc., and the inner and / or outer surfaces of the square case (200) may be treated with an insulating coating.

[0061] More specifically, the square case (200) may include a main body case (210) having both ends open based on the longitudinal direction of the electrode assembly (110), and a side case (250) covering both ends of the square case (200). However, the shape of the square case (200) is not limited thereto, and any structure that can easily accommodate the electrode assembly (110) inside the square case (200) may be included in the present embodiment.

[0062] For example, the parts where the main body case (210) and the side case (250) are in contact with each other may be joined by a method such as welding, so that the interior of the square case (200) can be sealed from the external environment. However, this is not limited to this, and any joining method that can seal the interior of the square case (200) may be included in this embodiment.

[0063] Accordingly, in the battery cell (100) according to the present embodiment, there is an advantage in that the safety of the battery cell (100) can be further improved as the electrode assembly (110) is accommodated in the square case (200).

[0064] Referring to FIGS. 1 and 2, terminal insertion holes (250h) may be formed at each end of the square case (200). Here, the both ends of the square case (200) may refer to side cases (250). The terminal insertion holes (250h) include a first terminal insertion hole and a second terminal insertion hole, and the first terminal insertion hole may be formed at one end of the square case (200) where the first electrode terminal (310) is positioned, and the second terminal insertion hole may be formed at the other end of the square case (200) where the second electrode terminal (350) is positioned.

[0065] In the battery cell (100) according to the present embodiment, the first electrode terminal (310) may pass through the first terminal insertion hole and protrude outward from the side case (250), and the second electrode terminal (350) may pass through the second terminal insertion hole and protrude outward from the side case (250).

[0066] Referring to FIGS. 1 and 2, the battery cell (100) according to the present embodiment may include a gasket part (gasket part, 400) that seals between the terminal insertion hole (250h) and the electrode terminals (310, 350). Here, the gasket part (400) may include a first gasket part that seals between the first terminal insertion hole and the first electrode terminal (310) and a second gasket part that seals between the second terminal insertion hole and the second electrode terminal (350). For example, the gasket part (400) may be made of a material having electrical insulation properties, impact resistance, elasticity, and durability.

[0067] The first gasket portion may extend between the first terminal insertion hole and the first electrode terminal (310), and the second gasket portion may extend between the second terminal insertion hole and the second electrode terminal (350). In other words, the gasket portion (400) includes a gasket hole (400h) at a position corresponding to the terminal insertion hole (250h) formed in the side case (250), and the electrode terminals (310, 350) may pass through the gasket hole (400h) and protrude outward from the side case (250). That is, the gasket portion (400) is inserted between the terminal insertion hole (250h) and the electrode terminal (310, 350), thereby sealing the area between the terminal insertion hole (250h) and the electrode terminal (310, 350).

[0068] In a battery cell (100) according to another embodiment of the present invention, the gasket portion (400) may be replaced with a first sealing portion and a second sealing portion, which are film members that seal between the first terminal insertion hole and the first electrode (310) terminal and between the second terminal insertion hole and the second electrode terminal (350), respectively. Here, the first sealing portion and the second sealing portion may seal between the first terminal insertion hole and the first electrode (310) terminal and between the second terminal insertion hole and the second electrode terminal (350) by applying heat of a predetermined temperature or higher.

[0069] Accordingly, in the battery cell (100) according to the present embodiment, contact between the side case (250) of the square case (200) corresponding to the metal member and the electrode terminal (310, 350) can be prevented, while the insulation between the side case (250) of the square case (200) and the electrode terminal (310, 350) can be further improved.

[0070] In addition, the battery cell (100) according to the present embodiment may further include a separate cap member that wraps the other end of the first electrode terminal (310) and the other end of the second electrode terminal (350) protruding outward from the square case (200). For example, the cap member may be made of a material having insulating performance. Accordingly, in the battery cell (100) according to the present embodiment, the cap member wraps the other end of the first electrode terminal (310) and the other end of the second electrode terminal (350) that are exposed to the outside, thereby preventing an external short circuit that may occur at the first electrode terminal (310) and the second electrode terminal (350).

[0071] A battery module according to another embodiment of the present invention may include the battery cells described above. Meanwhile, one or more battery modules according to the present embodiment may be packaged within a pack case to form a battery pack. However, the present invention is not limited thereto, and the battery cells described above may be directly packaged within a pack case in a structure where the battery module unit is omitted to form a battery pack.

[0072] The battery modules, battery packs, and / or battery packs including the same described above can be applied to various devices. These devices may be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles. However, the present invention is not limited thereto, and can be applied to various devices that can utilize battery modules and battery packs including the same, which also fall within the scope of the present invention.

[0073] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0074] [Explanation of symbols]

[0075] 100: Battery cells

[0076] 110: Electrode assembly

[0077] 130: First electrode

[0078] 131: First electrode current collector

[0079] 131t: First electrode tab

[0080] 135: First electrode active material layer

[0081] 150: Second electrode

[0082] 151: Second electrode current collector

[0083] 151t: Second electrode tab

[0084] 155: Second electrode active material layer

[0085] 170: Membrane

[0086] 200: Square case

[0087] 210: Body Case

[0088] 250: Side case

[0089] 250h: Terminal insertion hole

[0090] 300: Electrode terminal

[0091] 310: First electrode terminal

[0092] 350: Second electrode terminal

[0093] 400: Gasket section

[0094] 400h: Gasket hole

Claims

1. An electrode assembly in which a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode are sequentially laminated multiple times; and comprising a square case housing the electrode assembly; A first electrode terminal electrically connected to the first electrode and a second electrode terminal electrically connected to the second electrode are included, The first electrode terminal and the second electrode terminal extend in opposite directions based on the longitudinal direction of the electrode assembly, A battery cell in which the first electrode terminal and the second electrode terminal protrude outward from each end of the square case.

2. In paragraph 1, A battery cell wherein the first electrode terminal and the second electrode terminal each have a planar structure.

3. In paragraph 2, One end of the first electrode terminal electrically connected to the first electrode and the other end of the first electrode terminal protruding outwardly from the square case are located on the same plane, A battery cell in which one end of the second electrode terminal electrically connected to the second electrode and the other end of the second electrode terminal protruding outwardly from the square case are located on the same plane.

4. In paragraph 1, The first electrode includes a first electrode current collector and a first electrode active material layer formed on at least one of the upper and lower surfaces of the first electrode current collector, A battery cell wherein the second electrode includes a second electrode current collector and a second electrode active material layer formed on at least one of the upper and lower surfaces of the second electrode current collector.

5. In paragraph 4, The first electrode includes a first electrode tab, which is a region on at least one of the upper and lower surfaces of one end of the first electrode current collector in which the first electrode active material layer is not formed, A battery cell in which the second electrode includes a second electrode tab, which is a region on at least one of the upper and lower surfaces of one end of the second electrode current collector in which the second electrode active material layer is not formed.

6. In paragraph 5, The first electrode terminal is electrically connected to the first electrode tab, A battery cell in which the second electrode terminal is electrically connected to the second electrode tab.

7. In paragraph 6, The width of the first electrode terminal is equal to or greater than the width of the first electrode tab, A battery cell wherein the width of the second electrode terminal is equal to or greater than the width of the second electrode tab.

8. In paragraph 5, The width of the first electrode tab is 50% or more and 100% or less of the width of the first electrode active material layer, A battery cell wherein the width of the second electrode tab is 50% or more and 100% or less of the width of the second electrode active material layer.

9. In paragraph 1, The above square case is a battery cell made of a can type.

10. In paragraph 1, A first terminal insertion hole and a second terminal insertion hole are formed at each end of the square case, The first electrode terminal passes through the first terminal insertion hole and protrudes outside the square case, A battery cell in which the second electrode terminal passes through the second terminal insertion hole and protrudes outside the square case.

11. In paragraph 10, The battery cell further includes a first gasket portion that seals between the first terminal insertion hole and the first electrode terminal, and a second gasket portion that seals between the second terminal insertion hole and the second electrode terminal.

12. In paragraph 11, The first gasket portion extends between the first terminal insertion hole and the first electrode terminal, The second gasket portion is a battery cell extending along between the second terminal insertion hole and the second electrode terminal.

13. In paragraph 10, A battery cell further comprising a first sealing portion and a second sealing portion, which are film members that seal between the first terminal insertion hole and the first electrode terminal and between the second terminal insertion hole and the second electrode terminal, respectively.

14. A battery module comprising the battery cell of paragraph 1.

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