Battery cell

Abstract

The utility model relates to a battery cell. The battery cell comprises: a housing, one side of which is open and an accommodating space is formed in the housing; the electrode assembly is arranged in the accommodating space and comprises a plurality of first electrode plates electrically connected with the first electrode tabs and a plurality of second electrode plates electrically connected with the second electrode tabs, and the first electrode plates and the second electrode plates are alternately stacked; the current collector is arranged in the accommodating space and comprises a first electrode current collector plate electrically connected with the first electrode tab and a second electrode current collector plate electrically connected with the second electrode tab; and a cap assembly coupled to one side of the case to close the accommodation space so as to expose at least a portion of the first electrode collector plate and at least a portion of the second electrode collector plate, the first electrode tab coupled to the electrode assembly and disposed on a predetermined surface opposite the current collector among the plurality of surfaces of the electrode assembly, the second electrode tab is spaced apart from the first electrode tab by a predetermined distance, is coupled to the electrode assembly, and is disposed on a predetermined surface of the electrode assembly.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electrode assembly, and to an electrode assembly in which the stability of electrical connection between an electrode tab and a current collector is improved and the manufacturing process is simplified. BACKGROUND

[0002] Electrode assemblies in which charging and discharging is possible are used in portable small electronic devices such as mobile phones or camcorders, or a plurality of electrode assemblies are connected to be used as a power source for a driving motor of a hybrid vehicle or the like.

[0003] Such an electrode assembly can be manufactured in various shapes, and a prismatic electrode assembly is generally configured to include an electrode assembly in which positive and negative electrode plates are alternately stacked, and an electrolyte is accommodated in a case, and a current collector that is electrically connected to an electrode tab formed in the electrode assembly is accommodated in the case, and then a cover assembly that closes the case is mounted on the case. At this time, the current collector is also electrically connected to the cover assembly, and thus the electrode assembly is electrically connected to the cover assembly through the current collector.

[0004] On the other hand, a conventional prismatic electrode assembly has an insulator mounted between the electrode tab and the current collector, and thus in order to electrically connect the electrode tab that is in contact with one surface of the insulator and the current collector that is in contact with the other surface of the insulator, a portion of the electrode tab that protrudes between the insulator and the current collector needs to be folded to be in contact with the current collector and welded or the like.

[0005] However, when the electrode tab and the current collector are combined in this way, only a portion of the end of the electrode tab is in contact with the current collector, and thus the contact area and the bonding area between the electrode tab and the current collector are relatively small. That is, the electrical connection between the electrode tab and the current collector is unstable.

[0006] In addition, in order to manufacture an electrode assembly in which a separate insulator is mounted between the electrode tab and the current collector, a separate process for mounting the insulator between the electrode tab and the current collector is required, and thus the manufacturing process of the electrode assembly can be relatively complicated.

[0007] Therefore, there is a need to develop an electrode assembly in which an electrode tab and a current collector can be more stably electrically connected and which can be manufactured through a more simplified manufacturing process. SUMMARY

[0008] (1) Technical Problem to be Solved

[0009] According to one aspect of the present disclosure, an electrode assembly in which an electrode tab and a current collector can be more stably electrically connected is provided.

[0010] According to another aspect of the present disclosure, an electrode assembly that can be manufactured through a more simplified process is provided.

[0011] The battery cell of the disclosure can be widely applied to a green technology field using a battery such as an electric vehicle. In addition, the battery cell of the disclosure can be used for an eco-friendly electric vehicle, a hybrid vehicle, etc. that prevents climate change by reducing atmospheric pollution and greenhouse gas emissions.

[0012] (II) Technical Solution

[0013] As a technical solution for solving the above technical problem, a battery cell according to one embodiment of the disclosure can include a case which is open on one side and forms an accommodation space inside, an electrode assembly including a plurality of first electrode plates electrically connected with first electrode tabs and a plurality of second electrode plates electrically connected with second electrode tabs, the plurality of first electrode plates and the plurality of second electrode plates being alternately stacked, and the electrode assembly being disposed in the accommodation space, a current collector including a first electrode current collector plate electrically connected with the first electrode tabs and a second electrode current collector plate electrically connected with the second electrode tabs, and being disposed in the accommodation space, and a cover assembly which is combined with the one side of the case to close the accommodation space and exposes at least a portion of the first electrode current collector plate and at least a portion of the second electrode current collector plate, the first electrode tab can be combined with the electrode assembly and disposed on a predetermined face of a plurality of faces of the electrode assembly, the second electrode tab can be spaced apart from the first electrode tab by a predetermined distance, and can be combined with the electrode assembly and disposed on the predetermined face of the electrode assembly.

[0014] In addition, the predetermined face of the electrode assembly can be a face opposite the current collector.

[0015] In addition, the current collector can include an insulating member combined with at least a portion of the first electrode current collector plate and at least a portion of the second electrode current collector plate.

[0016] In addition, the insulating member can be formed in a plate shape, and can be formed with a first groove and a second groove, the first electrode current collector plate can be combined with the insulating member to fill the first groove, and the second electrode current collector plate can be combined with the insulating member to fill the second groove.

[0017] In addition, the first groove can be formed such that a portion of one face of the first electrode current collector plate in which the first groove is filled contacts the first electrode tab, and the second groove can be formed such that a portion of one face of the second electrode current collector plate in which the second groove is filled contacts the second electrode tab.

[0018] In addition, the first electrode tab can include a first electrode uncoated portion of each of the first electrode plates, the second electrode tab can include a second electrode uncoated portion of each of the second electrode plates, the electrode assembly can include a plurality of the first electrode tabs and a plurality of the second electrode tabs, a plurality of the first electrode uncoated portions of a portion of the plurality of the first electrode tabs can be bent in a first direction in which the plurality of first electrode plates and the plurality of second electrode plates are stacked, a plurality of the first electrode uncoated portions of the remaining portion can be bent in a second direction opposite to the first direction, a plurality of the second electrode uncoated portions of a portion of the plurality of the second electrode tabs can be bent in the first direction, and a plurality of the second electrode uncoated portions of the remaining portion can be bent in the second direction.

[0019] In addition, a portion of the plurality of the first electrode uncoated portions protruding from the predetermined surface can be bent in a manner of sandwiching the first electrode plate and combined with the other surface of the first electrode plate, and a portion of the plurality of the second electrode uncoated portions protruding from the predetermined surface can be bent in a manner of sandwiching the second electrode plate and combined with the other surface of the second electrode plate.

[0020] In addition, a plurality of the electrode assemblies can be stacked to form an electrode assembly stack, and disposed in the accommodation space, the first electrode tab can include a first electrode uncoated portion of each of the first electrode plates, the second electrode tab can include a second electrode uncoated portion of each of the second electrode plates, a plurality of the first electrode uncoated portions of the first electrode tab of each of the electrode assemblies can be bent in a direction away from an edge of the electrode assembly stack, and a plurality of the second electrode uncoated portions of the second electrode tab of each of the electrode assemblies can be bent in a direction away from the edge of the electrode assembly stack.

[0021] In addition, the electrode assembly stack can be formed to prevent the first electrode tab and the second electrode tab of a predetermined electrode assembly selected from among the plurality of electrode assemblies from being opposed to the first electrode tab and the second electrode tab of the electrode assembly adjacent to the predetermined electrode assembly.

[0022] In addition, the first groove can be formed such that a portion of one surface of the first electrode current collector in which the first groove is filled is in contact with the first electrode tab, and the second groove can be formed such that a portion of one surface of the second electrode current collector in which the second groove is filled is in contact with the second electrode tab.

[0023] In addition, the first electrode collector plate can include a first coupling portion including a portion filling the first groove, and a first terminal portion formed in connection with the first coupling portion and formed with a first electrode protrusion protruding in a direction toward the cover assembly, and the second electrode collector plate can include a second coupling portion including a portion filling the second groove, and a second terminal portion formed in connection with the second coupling portion and formed with a second electrode protrusion protruding in a direction toward the cover assembly.

[0024] In addition, the first electrode protrusion can protrude from the first terminal portion in a direction perpendicular to the first terminal portion, and the second electrode protrusion can protrude from the second terminal portion in a direction perpendicular to the second terminal portion.

[0025] In addition, a length of the first terminal portion in a direction perpendicular to one surface of the first electrode collector plate can be longer than a length of the first coupling portion in a direction perpendicular to one surface of the first electrode collector plate, and a length of the second terminal portion in a direction perpendicular to one surface of the second electrode collector plate can be longer than a length of the second coupling portion in a direction perpendicular to one surface of the second electrode collector plate.

[0026] In addition, the length of the first coupling portion in the direction perpendicular to one surface of the first electrode collector plate and the length of the second coupling portion in the direction perpendicular to one surface of the second electrode collector plate can be 0.5 mm or less, and the length of the first terminal portion in the direction perpendicular to one surface of the first electrode collector plate and the length of the second terminal portion in the direction perpendicular to one surface of the second electrode collector plate can be 1 mm or less.

[0027] In addition, the first electrode collector plate can be formed such that the first terminal portion is farther from the second electrode collector plate than the first coupling portion, and the second electrode collector plate can be formed such that the second terminal portion is farther from the first electrode collector plate than the second coupling portion.

[0028] The description and drawings of the present utility model contain specific matters of other embodiments solving technical problems.

[0029] (III) Beneficial Effects

[0030] According to the above-described one embodiment of the present disclosure, according to the battery cell of the present disclosure, since the portion filling the groove in the electrode collector plate combined with the insulating member formed with the groove contacts the electrode tab, the contact area between the electrode tab and the electrode collector plate of the current collector is relatively large, thereby enabling more stable electrical connection between the electrode tab and the current collector.

[0031] In addition, the electrode tab formed by the uncoated portion is configured to be bent in a predetermined direction so as to stably contact the current collector, so that the electrode tab and the current collector can be more stably electrically connected.

[0032] In addition, since the battery cell can be manufactured without a process of installing an insulator between the electrode tab and the current collector, the battery cell can be manufactured through a more simplified process. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is an exploded perspective view of a battery cell according to one embodiment of the disclosure.

[0034] Figure 2 is a perspective view showing a case.

[0035] Figure 3 is a perspective view showing an electrode assembly.

[0036] Figure 4 is a perspective view showing another example of an electrode assembly.

[0037] Figure 5 is a view showing an electrode assembly including electrode tabs bent in opposite directions from each other.

[0038] Figure 6 is a view showing a first electrode tab bent in a first direction as viewed from a third direction.

[0039] Figure 7 is a view showing a first electrode tab bent in an opposite direction of the first direction as viewed from a third direction.

[0040] Figure 8 is a view showing a plurality of electrode assemblies stacked to form an electrode assembly stack.

[0041] Figure 9 is a view showing a first electrode tab of a first electrode assembly as viewed from a third direction.

[0042] Figure 10 is a view showing a first electrode tab of a second electrode assembly as viewed from a third direction.

[0043] Figure 11 is a perspective view showing a current collector.

[0044] Figure 12 is a view showing a current collector, showing one side of the current collector.

[0045] Figure 13 is a view showing a current collector, showing another side of the current collector.

[0046] Figure 14is a drawing showing the current collector, showing a face perpendicular to one face and the other face of the current collector.

[0047] Figure 15 is a perspective view showing the electrode assembly in combination with the current collector.

[0048] Figure 16 is a drawing showing a cross section of the electrode assembly of Figure 15 is a drawing showing a cross section of the electrode assembly of

[0049] Figure 17 is a drawing showing the current collector in combination with the electrode assembly including electrode tabs bent in opposite directions from each other.

[0050] Figure 18 is a drawing showing the first electrode tab bent in the first direction in contact with the first electrode plate.

[0051] Figure 19 is a drawing showing the first electrode tab bent in the opposite direction of the first direction in contact with the first electrode plate.

[0052] Figure 20 is a drawing showing the electrode tab protruding from the electrode assembly bent to be combined to the electrode plate.

[0053] Figure 21 is a drawing showing the current collector in combination with a plurality of electrode assemblies stacked to form an electrode assembly stack.

[0054] Figure 22 is a drawing showing the first electrode tab of the first electrode assembly in contact with the first electrode plate.

[0055] Figure 23 is a drawing showing the first electrode tab of the second electrode assembly in contact with the first electrode plate.

[0056] Figure 24 is a drawing showing the current collector in combination with the electrode assembly stack. Figure 25 is a perspective view showing the cap assembly.

[0057] Figure 26 is a perspective view showing the case in combination with the cap assembly.

[0058] Figure 27 is an enlarged view of the B portion of the partially cut Figure 11

[0059] is a flowchart showing a manufacturing method of the battery cell according to one embodiment of the disclosure. Figure 28

[0060] is a drawing for explaining the 5th step. Figure 29

[0061] is a drawing for explaining the 5th step.Figure 30 FIG. 6 is a diagram for explaining the 6th step.

[0062] Reference numerals:

[0063] 1: cell

[0064] 100: case

[0065] 200: electrode assembly

[0066] 200-1: first electrode assembly

[0067] 200-2: second electrode assembly

[0068] 210: first electrode tab

[0069] 220: second electrode tab

[0070] 300: current collector

[0071] 310: first electrode current collector plate

[0072] 320: second electrode current collector plate

[0073] 330: insulating member

[0074] 400: cover assembly DETAILED DESCRIPTION

[0075] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so as to be easily practiced by one of ordinary skill in the art to which the present disclosure pertains. However, the present disclosure can be embodied in various different forms and is not limited to the embodiments described herein. Also, in order to clearly describe the present disclosure, portions unrelated to the description are omitted from the accompanying drawings, and like portions are denoted by like reference numerals throughout the specification.

[0076] Throughout the specification, when it is referred to that one part is "connected" to another part, this includes not only the case where the one part is "directly connected" to the other part, but also the case where the one part is "electrically connected" to the other part with other elements interposed therebetween.

[0077] Throughout the specification, when it is referred to that one part is "on" another part, this includes not only the case where the one part is in contact with the other part, but also the case where other parts are present between the two parts.

[0078] Throughout the specification, when it is mentioned that a certain part "comprises" a certain component, it means that other components can be further included unless it is specifically noted to the contrary. The terms "about", "substantially" and the like used throughout the specification mean the meaning inherent to the manufacturing and materials' allowable errors when giving the mentioned meaning, and the purpose of using these terms is to prevent dishonest infringers from improper use of the disclosure of the precise or absolute values mentioned to help understand the present disclosure. The term "… step" or "step of…" used throughout the specification does not mean "step for…".

[0079] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings and later-described contents. However, the present disclosure is not limited to the embodiments described herein, and can be embodied in various forms. Throughout the specification, the same reference numerals denote the same components.

[0080] Hereinafter, an electrode assembly according to one embodiment of the present disclosure will be described.

[0081] Figure 1 is an exploded perspective view of an electrode assembly according to one embodiment of the present disclosure.

[0082] Referring to Figure 1 , the electrode assembly 200 includes a plurality of first electrode plates electrically connected to the first electrode tab 210 and a plurality of second electrode plates electrically connected to the second electrode tab 220, and the plurality of first electrode plates and the plurality of second electrode plates are alternately stacked.

[0083] First, the housing 100 will be described.

[0084] Figure 2 is a perspective view illustrating a housing.

[0085] Referring to Figure 2 , the housing 100 is open on one side and can form an accommodation space 110 inside.

[0086] The accommodation space 110 formed in the housing 100 can accommodate the electrode assembly 200 and the current collector 300, which will be described later, and the housing 100 can be formed of the same material as the cap assembly 400, which will be described later.

[0087] Next, the electrode assembly 200 will be described.

[0088] Figure 3 is a perspective view illustrating an electrode assembly.

[0089] Referring to Figure 3 , the electrode assembly 200 can include a plurality of first electrode plates electrically connected to the first electrode tab 210 and a plurality of second electrode plates electrically connected to the second electrode tab 220, and the plurality of first electrode plates and the plurality of second electrode plates are alternately stacked.

[0090] The first electrode plate can function as a positive electrode, and when the first electrode plate functions as a positive electrode, the first electrode plate can be formed by coating a first electrode active material such as a transition metal oxide on a first electrode current collector formed of a metal foil such as aluminum.

[0091] In addition, the first electrode plate includes a region in which the first electrode active material is not coated, i.e., a first electrode uncoated portion, and the first electrode uncoated portion can function as a current flow path between the first electrode plate and the outside, and can also form a first electrode tab 210.

[0092] The second electrode plate can function as a negative electrode, and when the second electrode plate functions as a negative electrode, the second electrode plate can be formed by coating a second electrode active material such as graphite or carbon on a second electrode current collector formed of a metal foil such as copper or nickel.

[0093] In addition, the second electrode plate includes a region in which the second electrode active material is not coated, i.e., a second electrode uncoated portion, and the second electrode uncoated portion can function as a current flow path between the second electrode plate and the outside, and can also form a second electrode tab 220.

[0094] The plurality of first electrode plates and the plurality of second electrode plates thus formed are alternately stacked and included in the electrode assembly 200, and the electrode assembly 200 is accommodated together with an electrolyte in the accommodation space 110 of the case 100.

[0095] At this time, as shown in FIG. 1, Figure 3 The first electrode tab 210 formed of the first electrode uncoated portion or formed of a separate member can be combined with the electrode assembly 200 and disposed on a predetermined one of the plurality of faces of the electrode assembly 200.

[0096] In addition, the second electrode tab 220 formed of the second electrode uncoated portion or formed of a separate member can be spaced apart from the first electrode tab 210 by a predetermined distance, and combined with the electrode assembly 200 and disposed on a predetermined face of the electrode assembly 200.

[0097] At this time, the predetermined face of the electrode assembly 200 can be a face opposite the current collector 300, which will be described later.

[0098] In addition, the remaining portion of the outer circumferential face of the electrode assembly 200 except for the portion combined with the current collector 300 can be covered by an insulator.

[0099] In addition, the electrode assembly 200 can include the first electrode tab 210 and the second electrode tab 220 bent in a free direction.

[0100] For example, as shown in FIG. 1, Figure 3As shown, the electrode assembly 200 can include the first electrode tab 210 and the second electrode tab 220 bent toward the same direction.

[0101] At this time, the first electrode tab 210 can be formed in two or more, and the second electrode tab 220 can also be formed in two or more.

[0102] Figure 4 is a perspective view showing another example of an electrode assembly.

[0103] Unlike this, as Figure 4 shown, the electrode assembly 200 can include the first electrode tab 210 and the second electrode tab 220 bent in opposite directions to each other.

[0104] At this time, the first electrode tab 210 can be formed in two or more, and the second electrode tab 220 can also be formed in two or more.

[0105] That is, the bending direction of the first electrode tab 210 and the second electrode tab 220 included in the electrode assembly 200 is not particularly limited, and the number thereof is also not particularly limited.

[0106] On the other hand, the electrode assembly 200 can be configured to be able to be electrically connected more stably with the current collector 300.

[0107] Figure 5 is a view showing an electrode assembly including electrode tabs bent in opposite directions to each other.

[0108] For example, referring Figure 5 to the description, the electrode assembly 200 can be configured to include a plurality of first electrode tabs 210 and a plurality of second electrode tabs 220.

[0109] And, the first electrode tab 210 can include a first electrode uncoated portion of each first electrode plate, and the second electrode tab 220 can include a second electrode uncoated portion of each second electrode plate.

[0110] At this time, a plurality of first electrode uncoated portions of a part of the plurality of first electrode tabs 210 can be bent in a first direction in which the plurality of first electrode plates and the plurality of second electrode plates are stacked, and a plurality of first electrode uncoated portions of the remaining part can be bent in a second direction opposite to the first direction.

[0111] Figure 6 is a view showing a first electrode tab bent in a first direction as viewed from a third direction.

[0112] In detail, as Figure 6 shown, a plurality of first electrode uncoated portions in any one first electrode tab 211 can be bent in a first direction in which the plurality of first electrode plates and the plurality of second electrode plates are stacked.

[0113] As described above, the plurality of first electrode uncoated portions are bent in the first direction, such that the first electrode uncoated portion A extending from the first electrode plate disposed adjacent to the first direction end portion of the electrode assembly 200 among the plurality of first electrode plates can protrude in the first direction from the predetermined face of the electrode assembly 200.

[0114] Figure 7 is a view showing the first electrode tab bent in the opposite direction of the first direction as viewed from the third direction.

[0115] Also, as Figure 7 shown, the plurality of first electrode uncoated portions in the other first electrode tab 212 can be bent in the second direction, which is the opposite direction of the first direction.

[0116] As described above, the plurality of first electrode uncoated portions are bent in the second direction, such that the first electrode uncoated portion B extending from the first electrode plate disposed adjacent to the first direction end portion of the electrode assembly 200 among the plurality of first electrode plates can be disposed on the predetermined face of the electrode assembly 200.

[0117] In addition, the plurality of second electrode uncoated portions of a portion of the plurality of second electrode tabs 220 can be bent in the first direction, and the plurality of second electrode uncoated portions of the remaining portion can be bent in the second direction.

[0118] On the other hand, the configuration principle in which the plurality of second electrode tabs 220 are bent in opposite directions from each other is the same as the configuration principle in which the plurality of first electrode tabs 210 are bent in opposite directions from each other, and thus a detailed description is omitted.

[0119] Figure 8 is a view showing an electrode assembly stack formed by stacking a plurality of electrode assemblies.

[0120] In another example, referring to Figure 8 , a plurality of electrode assemblies 200 are stacked to form an electrode assembly stack, and are disposed in the accommodation space 110.

[0121] Figure 8 A view showing that the first electrode assembly 200-1 and the second electrode assembly 200-2 are stacked is shown in , but the number of electrode assemblies 200 forming the electrode assembly stack is not limited to two.

[0122] Figure 8 Also, as shown, the electrode assembly stack can be formed to prevent the first electrode tab 210 and the second electrode tab 220 of a predetermined electrode assembly 200 selected from among the plurality of electrode assemblies 200 from being opposed to the first electrode tab 210 and the second electrode tab 220 of the electrode assembly 200 adjacent to the predetermined electrode assembly 200.

[0123] Each of the electrode assemblies 200 can be configured such that the first electrode tab 210 includes the first electrode uncoated portion of each of the first electrode plates, and the second electrode tab 220 includes the second electrode uncoated portion of each of the second electrode plates.

[0124] That is, the first electrode tab 210-1 of the first electrode assembly 200-1 can include the first electrode uncoated portion of each of the first electrode plates of the first electrode assembly 200-1, and the second electrode tab 220-1 of the first electrode assembly 200-1 can include the second electrode uncoated portion of each of the second electrode plates of the first electrode assembly 200-1.

[0125] Likewise, the first electrode tab 210-2 of the second electrode assembly 200-2 can include the first electrode uncoated portion of each of the first electrode plates of the second electrode assembly 200-2, and the second electrode tab 220-2 of the second electrode assembly 200-2 can include the second electrode uncoated portion of each of the second electrode plates of the second electrode assembly 200-2.

[0126] At this time, the plurality of first electrode uncoated portions of the first electrode tab 210 of each of the electrode assemblies 200 can be bent in a direction away from the edge of the electrode assembly stack. Figure 9 is a view illustrating the first electrode tab of the first electrode assembly viewed from a third direction.

[0127] In particular, as Figure 9 illustrated, the plurality of first electrode uncoated portions of the first electrode tab 210-1 of the first electrode assembly 200-1 can be bent in a direction away from the edge of the electrode assembly stack.

[0128] As described above, the plurality of first electrode uncoated portions are bent in a direction away from the edge of the electrode assembly stack, so that the first electrode uncoated portion C extending from the first electrode plate of the plurality of first electrode plates of the first electrode assembly 200-1 which is disposed adjacent to the second electrode assembly 200-2 can be disposed on a predetermined face of the second electrode assembly 200-2.

[0129] Figure 10 is a view illustrating the first electrode tab of the second electrode assembly viewed from a third direction.

[0130] And, as Figure 10 illustrated, the plurality of first electrode uncoated portions of the first electrode tab 210-2 of the second electrode assembly 200-2 can be bent in a direction away from the edge of the electrode assembly stack.

[0131] As described above, the plurality of first electrode uncoated portions are bent in a direction away from the edge of the electrode assembly stack, so that the first electrode uncoated portion D extending from the first electrode plate disposed adjacent to the first electrode assembly 200-1 among the plurality of first electrode plates of the second electrode assembly 200-2 can be disposed on a predetermined face of the first electrode assembly 200-1.

[0132] In addition, the plurality of second electrode uncoated portions of the second electrode tab 220 of each electrode assembly 200 can be bent in a direction away from the edge of the electrode assembly stack.

[0133] On the other hand, the configuration principle in which the second electrode tab 220 of each electrode assembly 200 is bent in a direction away from the edge of the electrode assembly stack is the same as the configuration principle in which the first electrode tab 210 of each electrode assembly 200 is bent in a direction away from the edge of the electrode assembly stack, and thus a detailed description is omitted.

[0134] Next, the current collector 300 will be described.

[0135] Figure 11 is a perspective view illustrating the current collector.

[0136] Referring to Figure 11 , the current collector 300 includes a first electrode current collector plate 310, a second electrode current collector plate 320, and an insulating member 330, and the current collector 300 is combined with a portion of the electrode assembly 200 exposed to one side of the case 100 and disposed in the accommodation space 110.

[0137] The first electrode current collector plate 310 and the second electrode current collector plate 320 are formed of a conductor such as metal, and are respectively combined with the insulating member 330.

[0138] The insulating member 330 is formed of a material capable of performing an insulating function, and is combined with at least a portion of the first electrode current collector plate 310 and at least a portion of the second electrode current collector plate 320.

[0139] Figure 12 is a view illustrating one face of the current collector, Figure 13 is a view illustrating the other face of the current collector.

[0140] Specifically, the insulating member 330 is formed in a plate shape, and is formed with a first groove and a second groove, as illustrated in Figure 12 and Figure 13 The first electrode current collector plate 310 is combined with the insulating member 330 to fill the first groove, and the second electrode current collector plate 320 is combined with the insulating member 330 to fill the second groove.

[0141] At this time, the first groove and the second groove of the insulating member 330 are formed so that, when the current collector 300 is disposed in the accommodation space 110, the first electrode current collector plate 310 is electrically connected to the plurality of first electrode tabs 210, and the second electrode current collector plate 320 is electrically connected to the plurality of second electrode tabs 220.

[0142] For example, the first groove can be formed so that, when the current collector 300 is disposed in the accommodation space 110, Figure 12 The portion of the first electrode current collector plate 310 illustrated in one side of which the first groove is filled contacts the first electrode tab 210. Also, the second groove can be formed so that, when the current collector 300 is disposed in the accommodation space 110, Figure 12 The portion of the second electrode current collector plate 320 illustrated in one side of which the second groove is filled contacts the second electrode tab 220.

[0143] By forming the current collector 300 as described above, the first electrode current collector plate 310 and the first electrode tab 210 can be in contact and electrically connected with a relatively large area, and the second electrode current collector plate 320 and the second electrode tab 220 can also be in contact and electrically connected with a relatively large area.

[0144] On the other hand, the first groove of the insulating member 330 can be formed so that the first electrode current collector plate 310 is electrically connected to the first electrode tab 210, and prevents the first electrode current collector plate 310 from contacting other parts of the electrode assembly 200 other than the first electrode tab 210.

[0145] For example, the first groove can be formed so that, when the current collector 300 is disposed in the accommodation space 110, Figure 12 The portion of the first electrode current collector plate 310 illustrated in one side of which the first groove is filled contacts the first electrode tab 210.

[0146] Also, the second groove of the insulating member 330 can be formed so that the second electrode current collector plate 320 is electrically connected to the second electrode tab 220, and prevents the second electrode current collector plate 320 from contacting other parts of the electrode assembly 200 other than the second electrode tab 220.

[0147] For example, the second groove can be formed so that, when the current collector 300 is disposed in the accommodation space 110, Figure 12 The portion of the second electrode current collector plate 320 illustrated in one side of which the second groove is filled contacts the second electrode tab 220.

[0148] As described above, by forming the first groove and the second groove, short circuiting between the first electrode current collector plate 310 and the electrode assembly 200 or short circuiting between the second electrode current collector plate 320 and the electrode assembly 200 can be effectively prevented.

[0149] On the other hand, asFigure 11 The first electrode collector plate 310 includes a first coupling portion 311 and a first terminal portion 312 as shown.

[0150] The first coupling portion 311 is a portion of the first electrode collector plate 310 including a portion filling the first groove.

[0151] The first terminal portion 312 is a portion of the first electrode collector plate 310 formed in connection with the first coupling portion 311, and is formed with a first electrode protrusion 313 protruding in a direction toward the cover assembly 400. The first electrode protrusion 313 can protrude from the first terminal portion 312 in a direction perpendicular to the first terminal portion 312.

[0152] At this time, the first terminal portion 312 can be formed thicker than the first coupling portion 311 so as to more stably transmit the current transferred from the first coupling portion 311.

[0153] Figure 14 is a view showing a collector, showing a face perpendicular to one face and the other face of the collector.

[0154] In detail, referring to Figure 14 , the first terminal portion 312 can be formed such that a length L1 of the first terminal portion 312 in a direction perpendicular to one face of the first electrode collector plate 310 can be longer than a length L2 of the first coupling portion 311 in the direction perpendicular to one face of the first electrode collector plate 310.

[0155] For example, the first coupling portion 311 and the first terminal portion 312 can be formed such that the length L2 of the first coupling portion 311 in the direction perpendicular to one face of the first electrode collector plate 310 is 0.5 mm or less, and the length L1 of the first terminal portion 312 in the direction perpendicular to one face of the first electrode collector plate 310 is 1 mm or less.

[0156] In addition, as shown in Figure 11 , the second electrode collector plate 320 includes a second coupling portion 321 and a second terminal portion 322.

[0157] The second coupling portion 321 is a portion of the second electrode collector plate 320 including a portion filling the second groove.

[0158] The second terminal portion 322 is a portion of the second electrode collector plate 320 formed in connection with the second coupling portion 321, and is formed with a second electrode protrusion 323 protruding in a direction toward the cover assembly 400. The second electrode protrusion 323 can protrude from the second terminal portion 322 in a direction perpendicular to the second terminal portion 322.

[0159] Like the first terminal portion 312, the second terminal portion 322 can be formed thicker than the second bonding portion 321 so as to more stably transmit the current transferred from the second bonding portion 321.

[0160] In detail, referring to Figure 14 , the second terminal portion 322 can be formed such that a length L3 of the second terminal portion 322 in a direction perpendicular to one face of the second electrode current collector 320 can be longer than a length L4 of the second bonding portion 321 in the direction perpendicular to the one face of the second electrode current collector 320.

[0161] For example, the second bonding portion 321 and the second terminal portion 322 can be formed such that the length L4 of the second bonding portion 321 in the direction perpendicular to the one face of the second electrode current collector 320 is 0.5 mm or less, and the length L3 of the second terminal portion 322 in the direction perpendicular to the one face of the second electrode current collector 320 is 1 mm or less.

[0162] On the other hand, as shown in Figure 14 , the first electrode current collector 310 can be formed such that the first terminal portion 312 is farther from the second electrode current collector 320 than the first bonding portion 311, and the second electrode current collector 320 can be formed such that the second terminal portion 322 is farther from the first electrode current collector 310 than the second bonding portion 321.

[0163] Figure 15 is a perspective view showing an electrode assembly combined with a current collector, Figure 16 is a view showing a cross section of the electrode assembly of Figure 15 taken along the line A-A' viewed in the X direction.

[0164] As shown in Figure 15 , when the current collector 300 is disposed in the accommodation space 110, a portion of the one face of the first electrode current collector 310 in which the first groove is filled contacts the plurality of first electrode tabs 210, and a portion of the one face of the second electrode current collector 320 in which the second groove is filled contacts the plurality of second electrode tabs 220.

[0165] In addition, as shown in Figure 16 , a portion of the plurality of first electrode tabs 210 that protrudes outside a space between the first electrode current collector 310 and the electrode assembly 200 can be folded and combined with the other face of the first electrode current collector 310 by laser welding or the like.

[0166] In addition, although not shown in the drawings, a portion of the plurality of second electrode tabs 220 that protrudes outside a space between the second electrode current collector 320 and the electrode assembly 200 can also be folded and combined with the other face of the second electrode current collector 320 by laser welding or the like.

[0167] On the other hand, even if the electrode assembly 200 includes a plurality of electrode tabs bent in opposite directions to each other, it can be stably connected with the current collector 300.

[0168] Figure 17 is a view showing that the current collector is coupled to an electrode assembly including electrode tabs bent in opposite directions to each other.

[0169] As Figure 17 shown, when the electrode assembly 200 includes a plurality of first electrode tabs 211, 212 and a plurality of second electrode tabs 221, 222, the current collector 300 can be coupled to the electrode assembly 200 such that the first electrode plate 310 is in contact with the plurality of first electrode tabs 211, 212 and the second electrode plate 320 is in contact with the second electrode tabs 221, 222.

[0170] Figure 18 is a view showing that the first electrode tab bent in the first direction is in contact with the first electrode plate.

[0171] At this time, as Figure 18 shown, when any one of the first electrode tabs 211 bent in the first direction is in contact with the first electrode plate 310, the first electrode uncoated portion A extending from the first electrode plate disposed adjacent to the first direction end portion of the electrode assembly 200 among the plurality of first electrode plates can protrude in the first direction from the predetermined face of the electrode assembly 200, and thus can not be in contact with the first electrode plate 310.

[0172] Figure 19 is a view showing that the first electrode tab bent in the opposite direction of the first direction is in contact with the first electrode plate.

[0173] However, as Figure 19 shown, when the other electrode tab 212 bent in the opposite direction of the first direction is in contact with the first electrode plate 310, the first electrode uncoated portion B extending from the first electrode plate disposed adjacent to the first direction end portion of the electrode assembly 200 among the plurality of first electrode plates is located on the predetermined face of the electrode assembly 200, and thus is in contact with the first electrode plate 310.

[0174] That is, the first electrode tabs 211, 212 are bent in opposite directions to each other, and thus it is possible to prevent the phenomenon that a part of the first electrode uncoated portion extending from the first electrode plate is not in contact with the first electrode plate 310.

[0175] Likewise, the second electrode tabs 221, 222 are bent in opposite directions from each other, so that a phenomenon in which a portion of the second electrode uncoated portion extending from the second electrode plate does not contact the second electrode plate 320 can be prevented. On the other hand, a portion of the plurality of first electrode uncoated portions protruding from a predetermined face of the electrode assembly 200 can be bent in a manner of sandwiching the first electrode plate 310 and combined with the other face of the first electrode plate 310, and a portion of the plurality of second electrode uncoated portions protruding from the predetermined face of the electrode assembly 200 can be bent in a manner of sandwiching the second electrode plate 320 and combined with the other face of the second electrode plate 320.

[0176] Figure 20 is a view illustrating that an electrode tab protruding from an electrode assembly is bent to be combined to an electrode plate.

[0177] For example, as shown in Figure 20 a portion of the plurality of first electrode uncoated portions of the first electrode tab 211 protruding in a first direction from a predetermined face of the electrode assembly 200 and a portion of the plurality of first electrode uncoated portions of the other first electrode tab 212 protruding in an opposite direction of the first direction from the predetermined face of the electrode assembly 200 are bent and combined to the first electrode plate 310, respectively.

[0178] Even if the plurality of electrode assemblies 200 are stacked to form an electrode assembly stack, stable connection with the current collector 300 can be made.

[0179] Figure 21 is a view illustrating that a current collector is combined to an electrode assembly stack formed by stacking a plurality of electrode assemblies.

[0180] As shown in Figure 21 when the current collector 300 is combined to the electrode assembly stack formed by stacking the plurality of electrode assemblies 200, the current collector 300 can be combined to the electrode assembly stack such that the first electrode plate 310 contacts the first electrode tabs 210-1, 210-2 of each of the electrode assemblies 200-1, 200-2 and the second electrode plate 320 contacts the second electrode tabs 220-1, 220-2 of each of the electrode assemblies 200-1, 200-2.

[0181] Figure 22 is a view illustrating that a first electrode tab of a first electrode assembly contacts a first electrode plate.

[0182] At this time, as shown in Figure 22As shown, the plurality of first electrode uncoated portions of the first electrode tab 210-1 of the first electrode assembly 200-1 are bent in a direction away from the edge of the electrode assembly stack, so that the first electrode uncoated portion C extending from the first electrode plate disposed adjacent to the second electrode assembly 200-2 among the plurality of first electrode plates of the first electrode assembly 200-1 can be disposed on the predetermined face of the second electrode assembly 200-2.

[0183] On the other hand, since the current collector 300 is combined with the predetermined face of the first electrode assembly 200-1 and the predetermined face of the second electrode assembly 200-2, the first electrode uncoated portion C disposed on the predetermined face of the second electrode assembly 200-2 can also be in contact with the first electrode plate 310.

[0184] Figure 23 is a view showing that the first electrode tab of the second electrode assembly is in contact with the first electrode plate.

[0185] Likewise, as Figure 23 shown, the plurality of first electrode uncoated portions of the first electrode tab 210-2 of the second electrode assembly 200-2 are bent in a direction away from the edge of the electrode assembly stack, so that the first electrode uncoated portion D extending from the first electrode plate disposed adjacent to the first electrode assembly 200-1 among the plurality of first electrode plates of the second electrode assembly 200-2 can be disposed on the predetermined face of the first electrode assembly 200-1.

[0186] On the other hand, since the current collector 300 is combined with the predetermined face of the first electrode assembly 200-1 and the predetermined face of the second electrode assembly 200-2, the first electrode uncoated portion D disposed on the predetermined face of the first electrode assembly 200-1 can also be in contact with the first electrode plate 310.

[0187] The configuration principle in which the second electrode tab 220-1 of the first electrode assembly 200-1 and the second electrode tab 220-2 of the second electrode assembly 200-2 are in contact with the second electrode plate 320 is the same as the configuration principle in which the first electrode tab 210-1 of the first electrode assembly 200-1 and the first electrode tab 210-2 of the second electrode assembly 200-2 are in contact with the first electrode plate 310, and thus a detailed description is omitted.

[0188] Figure 24 is a view showing that the current collector is combined to the electrode assembly stack.

[0189] And, as Figure 24As shown, the current collector 300 can be combined with the electrode assembly stack by irradiating laser light to a portion E in the other face of the first electrode plate 310 located at the upper portion of the first electrode tabs 210-1, 210-2, and can be combined with the electrode assembly stack by irradiating laser light to a portion F in the other face of the second electrode plate 320 located at the upper portion of the second electrode tabs 220-1, 220-2.

[0190] Next, the cover assembly 400 is described.

[0191] Figure 25 is a perspective view illustrating a cover assembly.

[0192] Referring to Figure 25 , the cover assembly 400 can be combined with the case 100 to enclose the accommodation space 110, and includes a first electrode terminal 410 and a second electrode terminal 420.

[0193] Figure 26 is a view illustrating the case combined with the cover assembly.

[0194] Specifically, as Figure 26 shown, the cover assembly 400 can be combined with the case 100 to enclose the accommodation space 110, the cover assembly 400 being opposed to the electrode assembly 200 with the current collector 300 interposed therebetween. At this time, the cover assembly 400 can be combined with the case 100 by laser welding or the like.

[0195] Figure 27 is an enlarged view of a portion B of Figure 26 .

[0196] At this time, as Figure 27 shown, the second electrode terminal 420 can be formed so that at least a portion of the second electrode current collector plate 320 is exposed, and the at least a portion of the second electrode current collector plate 320 exposed through the second electrode terminal 420 can be the second electrode protrusion 323.

[0197] Although not shown in the drawings, the first electrode terminal 410 can also be formed so that at least a portion of the first electrode current collector plate 310 is exposed, and the at least a portion of the first electrode current collector plate 310 exposed through the first electrode terminal 410 can be the first electrode protrusion 313.

[0198] Hereinafter, a method of manufacturing a battery cell according to one embodiment of the disclosure is described.

[0199] Figure 28 is a flowchart illustrating a method of manufacturing a battery cell according to one embodiment of the disclosure.

[0200] Referring to Figure 28The manufacturing method of the battery cell can include: a first step S100 of preparing an electrode assembly; a second step S200 of preparing a current collector; a third step S300 of combining the electrode assembly with the current collector; a fourth step S400 of combining the current collector with a cover assembly; a fifth step S500 of covering an outer circumferential surface of the electrode assembly with an insulator; a sixth step S600 of accommodating the electrode assembly in a case; and a seventh step S700 of combining the cover assembly with the case.

[0201] First, the first step S100 will be described.

[0202] The first step S100 is a step of preparing the electrode assembly 200. The preparation of the electrode assembly 200 includes manufacturing the electrode assembly 200.

[0203] Specifically, the first step S100 is a step of preparing the electrode assembly 200 including a plurality of first electrode plates electrically connected with the first electrode tab 210 and a plurality of second electrode plates electrically connected with the second electrode tab 220, and the plurality of first electrode plates and the plurality of second electrode plates are alternately stacked, and the configuration of the electrode assembly 200 prepared in the first step S100 is the same as that of the electrode assembly 200 described in the battery cell 1 according to one embodiment of the disclosure.

[0204] Next, the second step S200 will be described.

[0205] The second step S200 is a step of preparing the current collector 300. The preparation of the current collector 300 includes manufacturing the current collector 300.

[0206] Specifically, the second step S200 is a step of preparing the current collector 300 including the first electrode current collector plate 310, the second electrode current collector plate 320, and the insulating member 330 combined with at least a portion of the first electrode current collector plate 310 and at least a portion of the second electrode current collector plate 320, and the configuration of the current collector 300 prepared in the second step S200 is the same as that of the current collector 300 described in the battery cell 1 according to one embodiment of the disclosure.

[0207] Next, the third step S300 will be described.

[0208] The third step S300 is a step of combining the electrode assembly 200 with the current collector 300.

[0209] Specifically, the third step S300 is a step of electrically connecting the first electrode tab 210 with the first electrode current collector plate 310, electrically connecting the second electrode tab 220 with the second electrode current collector plate 320, to combine the electrode assembly 200 with the current collector 300.

[0210] At this time, as described above, the first electrode collector tab 310 and the first electrode tab 210 can be in contact and electrically connected with a relatively large area, and the second electrode collector tab 320 and the second electrode tab 220 can also be in contact and electrically connected with a relatively large area.

[0211] In addition, since the remaining portion of the current collector 300 other than the portion in contact with the first electrode tab 210 and the portion in contact with the second electrode tab 220 is formed of the insulating member 330 having an insulating function, the third step S300 can combine the electrode assembly 200 and the current collector 300 without going through a process of providing a separate insulator between the electrode assembly 200 and the current collector 300.

[0212] Next, the fourth step S400 will be described.

[0213] The fourth step S400 is a step of combining the current collector 300 and the cap assembly 400. The configuration of the cap assembly 400 is the same as that of the cap assembly 400 described in the battery cell 1 according to one embodiment of the disclosure.

[0214] Specifically, the fourth step S400 is a step of combining the cap assembly 400 including the first electrode terminal 410 and the second electrode terminal 420 with the current collector 300 such that at least a portion of the first electrode collector tab 310 is exposed through the first electrode terminal 410 and at least a portion of the second electrode collector tab 320 is exposed through the second electrode terminal 420.

[0215] After going through the first step S100 to the fourth step S400 described above, and after the fifth step S500 to the seventh step S700 to be described later, the electrode assembly and the current collector can be accommodated in the accommodation space of the case, and the cap assembly can be combined with the case to close the accommodation space.

[0216] Next, the fifth step S500 will be described.

[0217] The fifth step S500 is a step of covering a plurality of faces of the electrode assembly 200, i.e., the outer peripheral face, with the insulator 500.

[0218] Figure 29 is a view for explaining the fifth step.

[0219] Specifically, as shown in Figure 29 the fifth step S500 is a step of covering the remaining faces of the plurality of faces of the electrode assembly 200 other than predetermined faces combined with the first electrode tab 210 and the second electrode tab 220 with the insulator 500. At this time, the insulator 500 is formed of a conventional insulating member or the like having an insulating function of preventing the flow of current.

[0220] Next, the sixth step S600 will be described.

[0221] The sixth step S600 is a step of coupling the cover assembly 400 to the case 100.

[0222] Figure 30 is a view for explaining the sixth step.

[0223] Specifically, as shown in Figure 30 the sixth step S600 is a step of inserting the electrode assembly 200 covered with the insulator 500 into the case 100, and then coupling the cover assembly 400 to the case 100 to enclose the accommodation space 110.

[0224] At this time, the cover assembly 400 can be coupled to the case 100 by laser welding or the like.

[0225] As described above, according to the battery cell and the manufacturing method of the battery cell of the present disclosure, since the portion in which the groove of the electrode current collecting plate combined with the insulating member in which the groove is formed contacts the electrode tab, the contact area between the electrode tab and the electrode current collecting plate of the current collector is relatively large, so that the electrode tab and the current collector can be more stably electrically connected.

[0226] In addition, the electrode tab formed by the uncoated portion is configured to be bent in a predetermined direction so as to stably contact the current collector, so that the electrode tab and the current collector can be more stably electrically connected.

[0227] In addition, since the battery cell can be manufactured without going through the process of installing the insulator between the electrode assembly and the current collector, the battery cell can be manufactured through a more simplified process.

[0228] The above description of the present disclosure is merely exemplary, and it will be understood by those skilled in the art to which the present disclosure pertains that various changes in form and details can be made thereto without changing the technical idea or essential characteristics of the present disclosure. Therefore, it should be understood that the above-described embodiments are exemplary in all aspects and are not restrictive. For example, each component described in a single form can be implemented in a dispersed form, and similarly, components described in a dispersed form can be implemented in a combined form.

[0229] The scope of the present disclosure is represented by the claims rather than the above detailed description, and all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included in the scope of the present disclosure.

Claims

1. An electric cell, characterized by, Comprising: a case, which is open on one side and forms an accommodation space inside; an electrode assembly, which includes a plurality of first electrode plates electrically connected with first electrode tabs and a plurality of second electrode plates electrically connected with second electrode tabs, the plurality of first electrode plates and the plurality of second electrode plates are alternately stacked, and the electrode assembly is disposed in the accommodation space; a current collector, which includes a first electrode current collecting plate electrically connected with the first electrode tabs and a second electrode current collecting plate electrically connected with the second electrode tabs, and is disposed in the accommodation space; and a cover assembly, which is combined with the one side of the case to close the accommodation space, and exposes at least a part of the first electrode current collecting plate and at least a part of the second electrode current collecting plate, the first electrode tabs are combined with the electrode assembly and disposed on a predetermined face of the plurality of faces of the electrode assembly opposite to the current collector, the second electrode tabs are spaced apart from the first electrode tabs by a predetermined distance, and are combined with the electrode assembly and disposed on the predetermined face of the electrode assembly. 2.The battery cell of claim 1, wherein the current collector includes an insulating member combined with at least a part of the first electrode current collecting plate and at least a part of the second electrode current collecting plate. 3.The battery cell of claim 2, wherein the insulating member is formed in a plate shape and formed with a first groove and a second groove, the first electrode current collecting plate is combined with the insulating member to fill the first groove, the second electrode current collecting plate is combined with the insulating member to fill the second groove. 4.The battery cell of claim 3, wherein the first groove is formed such that a part of the first electrode current collecting plate filling the first groove in one face thereof is in contact with the first electrode tab, the second groove is formed such that a part of the second electrode current collecting plate filling the second groove in one face thereof is in contact with the second electrode tab. 5.The battery cell of claim 4, wherein the first electrode tab includes a first electrode uncoated portion of each of the first electrode plates, and the second electrode tab includes a second electrode uncoated portion of each of the second electrode plates, the electrode assembly includes a plurality of the first electrode tabs and a plurality of the second electrode tabs, a plurality of the first electrode uncoated portions of a part of the plurality of the first electrode tabs are bent in a first direction in which the plurality of first electrode plates and the plurality of second electrode plates are stacked, and a plurality of the first electrode uncoated portions of the remaining part are bent in a second direction opposite to the first direction, a plurality of the second electrode uncoated portions of a part of the plurality of the second electrode tabs are bent in the first direction, and a plurality of the second electrode uncoated portions of the remaining part are bent in the second direction. 6.The battery cell of claim 5, wherein a part of the plurality of the first electrode uncoated portions protruding from the predetermined face is bent in a manner of sandwiching the first electrode plate and combined with the other face of the first electrode plate, ​ A portion of the second electrode uncoated portion protruding from the predetermined surface is bent in a manner of sandwiching the second electrode plate and is combined with the other surface of the second electrode plate.

7. The battery cell of claim 4, wherein, a plurality of the electrode assemblies are stacked to form an electrode assembly stack, and are disposed in the accommodation space, the first electrode tab includes a first electrode uncoated portion of each of the first electrode plates, and the second electrode tab includes a second electrode uncoated portion of each of the second electrode plates, a plurality of the first electrode uncoated portions of the first electrode tab of each of the electrode assemblies are bent in a direction away from an edge of the electrode assembly stack, a plurality of the second electrode uncoated portions of the second electrode tab of each of the electrode assemblies are bent in a direction away from an edge of the electrode assembly stack.

8. The battery cell of claim 7, wherein, the electrode assembly stack is formed to prevent the first electrode tab and the second electrode tab of a predetermined electrode assembly selected from among the plurality of electrode assemblies from being opposed to the first electrode tab and the second electrode tab of the electrode assembly adjacent to the predetermined electrode assembly.

9. The battery cell of claim 4, wherein, the first slot is formed such that a portion of the first electrode current collector plate in which the first slot is filled is in contact with the first electrode tab, the second slot is formed such that a portion of the second electrode current collector plate in which the second slot is filled is in contact with the second electrode tab.

10. The battery cell of claim 4, wherein, the first electrode current collector plate includes: a first combining portion including a portion in which the first slot is filled; and a first terminal portion connected to the first combining portion and formed to have a first electrode protrusion protruding in a direction toward the cover assembly, the second electrode current collector plate includes: a second combining portion including a portion in which the second slot is filled; and a second terminal portion connected to the second combining portion and formed to have a second electrode protrusion protruding in a direction toward the cover assembly.

11. The battery cell of claim 10, wherein, the first electrode protrusion protrudes from the first terminal portion in a direction perpendicular to the first terminal portion, the second electrode protrusion protrudes from the second terminal portion in a direction perpendicular to the second terminal portion.

12. The battery cell of claim 10, wherein, a length of the first terminal portion in a direction perpendicular to the one surface of the first electrode current collector plate is longer than a length of the first combining portion in the direction perpendicular to the one surface of the first electrode current collector plate, a length of the second terminal portion in a direction perpendicular to the one surface of the second electrode current collector plate is longer than a length of the second combining portion in the direction perpendicular to the one surface of the second electrode current collector plate.

13. The battery cell of claim 12, wherein, The length of the first joining portion in a direction perpendicular to one face of the first electrode current collector and the length of the second joining portion in a direction perpendicular to one face of the second electrode current collector are 0.5 mm or less, The length of the first terminal portion in a direction perpendicular to one face of the first electrode current collector and the length of the second terminal portion in a direction perpendicular to one face of the second electrode current collector are 1 mm or less.

14. The battery cell according to claim 12, wherein The first electrode current collector is formed such that the first terminal portion is farther from the second electrode current collector than the first joining portion, The second electrode current collector is formed such that the second terminal portion is farther from the first electrode current collector than the second joining portion.

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