Battery cell, battery pack and vehicle including same

Abstract

A battery cell according to the present invention comprises: an electrode assembly which is wound around a winding axis in a state in which a separator is interposed between a first electrode having a first polarity and a second electrode having a second polarity; a can housing in which the electrode assembly is accommodated; a first terminal, which is disposed on one side of the can housing and has a first polarity; a second terminal, which is disposed on one side of the can housing and has a second polarity; and a first current-collecting plate disposed on the other side of the can housing and electrically connected to the second electrode and the second terminal, wherein the first current-collecting plate has at least one extension part that extends to one side and is insulated from the first terminal.

Description

Battery cells, battery packs, and automobiles including the same

[0001] The present invention relates to a battery cell, a battery pack, and a vehicle including the same, and more specifically, to a battery cell, a battery pack, and a vehicle including the same that can drastically reduce the length of the current path.

[0002] This application is a priority claim application for Korean Patent Application No. 10-2024-0153636 filed on November 1, 2024, and all contents disclosed in the specification of said application are incorporated into this application by reference.

[0003] Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has increased rapidly, and the development of electric vehicles, energy storage batteries, robots, and satellites has accelerated, research on high-performance secondary batteries capable of repeated charging and discharging is actively underway.

[0004] Currently commercialized rechargeable batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density.

[0005] These lithium-ion secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. Additionally, the lithium-ion secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing that seals and encloses the electrode assembly together with an electrolyte.

[0006] Lithium-ion rechargeable batteries can be classified according to the shape of the battery case into pouch-type rechargeable batteries, in which the electrode assembly is embedded in a pouch made of aluminum laminate sheets, and can-type rechargeable batteries, in which the electrode assembly is embedded in a metal can. Furthermore, can-type rechargeable batteries can be further classified into cylindrical batteries and prismatic batteries depending on the shape of the metal can. These lithium-ion rechargeable batteries are utilized as battery modules or battery packs, which are assembled into a dense structure by overlapping or stacking multiple battery cells—either directly or mounted in cartridges—and then electrically connected to provide high voltage and high current.

[0007] Meanwhile, conventional cylindrical secondary batteries included an electrode assembly wound with a separator interposed between electrodes of different polarities and a can housing that accommodated the same. Such conventional cylindrical secondary batteries had a structure in which the can housing had a negative polarity and a positive terminal in the form of a rivet was disposed on the upper part of the can housing, so that both the negative and positive terminals were provided on the upper part of the can housing.

[0008] However, conventional cylindrical secondary batteries had a limitation in that the length of the current path from the negative electrode current collector to the upper part of the can housing was long because the negative electrode current collector was positioned on the lower side of the electrode assembly. Furthermore, if the total height of the can housing was increased to increase the energy capacity of the secondary battery, the length of the current path could become even longer. Therefore, there is an urgent need to develop a battery cell that can drastically reduce the length of the current path.

[0009] The present invention was conceived in consideration of the aforementioned problems and has one objective of providing a battery cell, a battery pack, and a vehicle including the same that can drastically reduce the length of the current path.

[0010] The technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by those skilled in the art from the description of the invention below.

[0011] A battery cell according to the present invention comprises: an electrode assembly provided by being wound around a winding axis with a separator interposed between a first electrode having a first polarity and a second electrode having a second polarity; a can housing in which the electrode assembly is received; a first terminal having a first polarity disposed on one side of the can housing; a second terminal having a second polarity disposed on one side of the can housing; and a first current collector plate disposed on the other side of the can housing and electrically connected to the second electrode and the second terminal, wherein the first current collector plate has at least one extension portion that extends to one side and is insulated from the first terminal.

[0012] The first current collector plate has an electrode coupling portion coupled to the second electrode, and the extension portion may be formed by extending from the outermost edge of the electrode coupling portion.

[0013] The above extension may be formed integrally with the above electrode coupling part.

[0014] The above extension may be provided in multiple numbers.

[0015] The above extension can be welded to the inner surface of the can housing.

[0016] The above extension may be spaced apart from the electrode assembly during the process of welding to the inner surface of the can housing.

[0017] The above extension can be positioned in close contact with the inner surface of the can housing by the expansion of the electrode assembly.

[0018] A battery cell according to the present invention has a first blank portion provided at one end of the first electrode and a second blank portion provided at the other end of the second electrode, and the extension portion may extend to an area adjacent to the first blank portion without contacting the first blank portion.

[0019] In the battery cell according to the present invention, at the first electrode, an insulating coating portion is laminated at the boundary region of the first non-retaining portion and the first retaining portion, and the extension portion may extend to the insulating coating portion.

[0020] The battery cell according to the present invention further includes an insulator configured to insulate the first non-removable portion and the can housing from each other, and the extension portion may extend to the insulator.

[0021] The above extension may be provided in the form of a cylinder.

[0022] The above-mentioned first collector plate may not protrude toward the other side.

[0023] A battery pack according to the present invention comprises at least one battery cell according to the present invention.

[0024] The automobile according to the present invention includes at least one battery pack according to the present invention.

[0025]

[0026] *

[0027] According to the present invention, a battery cell, a battery pack, and an automobile including the same can be provided, which can drastically reduce the length of the current path.

[0028] In addition, according to one aspect of the present invention, a battery cell, a battery pack, and a vehicle including the same can be provided, in which internal resistance is drastically reduced to enable the implementation of low resistance.

[0029] In addition, according to one aspect of the present invention, a battery cell with increased productivity, a battery pack, and an automobile including the same can be provided.

[0030] In addition, according to one aspect of the present invention, a battery cell, a battery pack, and an automobile including the same can be provided, in which a current path can be stably secured.

[0031] In addition, according to one aspect of the present invention, a battery cell, a battery pack, and an automobile including the same can be provided, with increased durability and electrical stability.

[0032] In addition, according to one aspect of the present invention, a battery cell, a battery pack, and an automobile including the same can be provided, which can prevent damage to an electrode assembly.

[0033] In addition, according to one aspect of the present invention, a battery cell, a battery pack, and an automobile including the same can be provided, wherein the energy density can be improved.

[0034] In addition, according to one aspect of the present invention, a battery cell, a battery pack, and an automobile including the same can be provided, wherein the cross-sectional area of ​​the current path can be maximized.

[0035] The effects of the present invention are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the attached drawings.

[0036] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0037] FIG. 1 is a perspective view showing the overall external appearance of a battery cell according to one embodiment of the present invention.

[0038] FIG. 2 is a side cross-sectional view showing the interior of a battery cell according to one embodiment of the present invention.

[0039] FIG. 3 is a perspective view showing the appearance of a first current collector plate according to one embodiment of the present invention.

[0040] FIG. 4 is an enlarged side cross-sectional view showing an extension being welded to a can housing inside a battery cell according to one embodiment of the present invention.

[0041] FIG. 5 is an enlarged side cross-sectional view showing the extension portion being in close contact with the can housing by the expansion of the electrode assembly inside the battery cell according to one embodiment of the present invention.

[0042] FIG. 6 is an unfolded view of the first electrode and the second electrode according to one embodiment of the present invention.

[0043] FIG. 7 is an enlarged side cross-sectional view showing the extension portion extending to the position immediately preceding the first portion inside a battery cell according to one embodiment of the present invention.

[0044] FIG. 8 is an enlarged side cross-sectional view showing the extension portion extending to the insulating coating portion inside a battery cell according to a modified example of an embodiment of the present invention.

[0045] FIG. 9 is an enlarged side cross-sectional view showing an extension portion extending to an insulator inside a battery cell according to another variation of an embodiment of the present invention.

[0046] FIG. 10 is a perspective view showing the appearance of a first current collector plate according to another variation of one embodiment of the present invention.

[0047] FIG. 11 is a perspective view showing the appearance of a first current collector plate according to another embodiment of the present invention.

[0048] FIG. 12 is a perspective view showing the appearance of a first current collector plate according to another embodiment of the present invention.

[0049] FIG. 13 is a drawing showing a battery pack according to one embodiment of the present invention.

[0050] FIG. 14 is a drawing showing a vehicle according to one embodiment of the present invention.

[0051] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0052] Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the invention and do not represent all of the technical ideas of the invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0053] FIG. 1 is a perspective view showing the overall external appearance of a battery cell according to one embodiment of the present invention, FIG. 2 is a side cross-sectional view showing the interior of a battery cell according to one embodiment of the present invention, and FIG. 3 is a perspective view showing the appearance of a first current collector plate according to one embodiment of the present invention.

[0054] Hereinafter, a battery cell (1) according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. A battery cell (1) according to an embodiment of the present invention may include an electrode assembly (10), a can housing (20), a first terminal (70), a second terminal (T), and a first current collector plate (40).

[0055] The electrode assembly (10) may include a first electrode (11a), a second electrode (11b), and a separator (12). The electrode assembly (10) may include a first electrode (11a) and a second electrode (11b). The separator (12) may be interposed between the first electrode (11a) and the second electrode (11b). The first electrode (11a) and the second electrode (11b) may have different polarities. The first electrode (11a) may have a first polarity, and the second electrode (11b) may have a second polarity opposite to the first polarity. For example, the first polarity may be positive and the second polarity may be negative. The separator (12) may be an insulator.

[0056] The electrode assembly (10) may have a jelly-roll structure. That is, the electrode assembly (10) may be manufactured by winding a laminate formed by stacking at least once with a separator (12) interposed between a sheet-shaped first electrode (11a) and a second electrode (11b) around a winding axis (C). Any jelly-roll structure known in the art may be applied to the present invention without limitation.

[0057] An electrode assembly (10) may be accommodated in the can housing (20). The can housing (20) may be provided in a hollow cylindrical shape to accommodate the electrode assembly (10), for example. A closed portion may be formed on one side of the can housing (20). An open portion may be formed on the other side of the can housing (20).

[0058] The can housing (20) may include a conductive material. For example, the can housing (20) may include one or more materials among aluminum, steel, and SUS.

[0059] In the above and below descriptions, "one side" can be understood as, for example, the side in the +Z direction or the upper side, and "the other side" can be understood as, for example, the side in the -Z direction or the lower side.

[0060] A first terminal (70) and a second terminal (T) may be disposed on one side of the can housing (20). The first terminal (70) and the second terminal (T) may be disposed together in the closed portion of the can housing (20).

[0061] The first terminal (70) may have a first polarity. The first terminal (70) may be configured as a positive terminal. The first terminal (70) may be electrically connected to the first electrode (11a). The first terminal (70) may be positioned with at least a portion exposed to the outside. The first terminal (70) may be positioned through one side of the can housing (20). The first terminal (70) may be provided in the form of a rivet.

[0062] The second terminal (T) may have a second polarity. The second terminal (T) may be configured as a negative terminal. The second terminal (T) may be electrically connected to the second electrode (11b). The second terminal (T) may be provided in a form that surrounds the first terminal (70). For example, the first terminal (70) may be positioned approximately in the center of one side (closed part) of the can housing (20), and the second terminal (T) may be provided in a ring form that surrounds the first terminal (70).

[0063] For reference, the can housing (20) may have a second polarity overall and may be configured as a negative terminal itself. However, the term second terminal (T) should be understood to refer to a part of the can housing (20) rather than the can housing (20) itself.

[0064] A first collector plate (40) may be disposed on the other side of the can housing (20). The first collector plate (40) may be disposed inside the can housing (20).

[0065] The first current collector plate (40) can be electrically connected to the second electrode (11b) and the second terminal (T). The first current collector plate (40) can have a second polarity. The first current collector plate (40) can be composed of a negative current collector plate.

[0066] The first collector plate (40) may be provided with an extension part (42). The extension part (42) may be provided with at least one.

[0067] The extension portion (42) may be extended to one side. Specifically, the extension portion (42) may be extended to one side toward the first terminal (70). Preferably, the extension portion (42) may be extended vertically parallel to the Z-axis toward the first terminal (70), and in this case, the length of the extension portion (42) may be formed to the shortest distance.

[0068] The extension part (42) may be insulated from the first terminal (70). That is, the extension part (42) may not be electrically connected to the first terminal (70).

[0069] As described above, the first collector plate (40) can be electrically connected to the can housing (20), and in particular, the extension part (42) can be electrically connected to the can housing (20). The extension part (42) can come into contact with the inner surface of the can housing (20).

[0070] A battery cell (1) according to one embodiment of the present invention can drastically reduce the length of the current path as configured above.

[0071] Specifically, in a conventional battery cell, the first current collector plate does not have a configuration corresponding to the extension part of the present invention, so the length of the current path between the first current collector plate and the first terminal is formed to be relatively long.

[0072] On the other hand, in a battery cell (1) according to one embodiment of the present invention, an extension portion (42) is provided on the first current collector plate (40), so that the first current collector plate (40) can be positioned relatively close to the first terminal (70) compared to a conventional battery cell, and thus the length of the current path between the first current collector plate (40) and the first terminal (70) can be formed relatively short. As a result, the length of the current path of the battery cell (1) can be drastically reduced. In addition, due to the reduction in the length of the current path, the internal resistance of the battery cell (1) can also be drastically reduced, so that a low-resistance battery cell (1) can be realized.

[0073]

[0074] The first current collector plate (40) may be provided with an electrode coupling portion (41). The electrode coupling portion (41) may be a part that is coupled to the second electrode (11b). The electrode coupling portion (41) may be provided in a roughly plate shape. The electrode coupling portion (41) may be welded to the second electrode (11b). The electrode coupling portion (41) may be coupled to the second foil tab (113b) provided on the second blank portion (112b) of the second electrode (11b), which will be described later.

[0075] When the first current collector plate (40) is provided with an electrode coupling portion (41), it can be coupled to the second electrode (11b) over a large area, so that the first current collector plate (40) can be securely coupled to the second electrode (11b) and the electrical connection between the first current collector plate (40) and the second electrode (11b) can be smoothly secured.

[0076] The extension portion (42) may be formed by extending from the electrode coupling portion (41). Specifically, the extension portion (42) may extend from the outermost edge of the electrode coupling portion (41). In this case, the maximum empty space can be secured inside the extension portion (42), so that the size of the electrode assembly (10) placed inside the extension portion (42) can be increased.

[0077]

[0078] The extension portion (42) can be formed integrally with the electrode coupling portion (41). For example, the extension portion (42) and the electrode coupling portion (41) are provided as a single flat plate before processing, and the portion corresponding to the extension portion (42) is bent so that the extension portion (42) can be formed integrally with the electrode coupling portion (41).

[0079] In this case, the first current collector plate (40) equipped with an extension part (42) can be easily manufactured, thereby increasing the productivity of the first current collector plate (40) and the battery cell (1).

[0080] Additionally, the extension portion (42) may be formed of the same material as the electrode coupling portion (41). The electrode coupling portion (41) and the extension portion (42) may include a material with excellent conductivity. For example, the electrode coupling portion (41) and the extension portion (42) may include copper material. In this case, the extension portion (42) may have excellent conductivity, so the internal resistance of the battery cell (1) can be reduced more effectively.

[0081]

[0082] Meanwhile, the first current collector plate (40) may be provided with a bridge (43) and a can coupling part (44). The can coupling part (44) may be a part coupled to the can housing (20) between the beading part (21) described later and the crimping part (22) described later, and the bridge (43) may be a part extending from the electrode coupling part (41) to the can coupling part (44). The bridge (43) may be extended obliquely toward the other side from the electrode coupling part (41), and the can coupling part (44) may be disposed at the tip of such a bridge (43).

[0083]

[0084] The extension portion (42) may be provided in multiple numbers. For example, as shown in FIG. 3, the extension portion (42) may be provided in two numbers, but is not limited thereto, and the extension portion (42) may be provided in three or more numbers. When the extension portion (42) is provided in multiple numbers, the cross-sectional area of ​​the current path between the first current collector plate (40) and the first terminal (70) may be increased.

[0085]

[0086] *

[0087] A plurality of extension parts (42) may be arranged symmetrically. For example, a plurality of extension parts (42) may be arranged symmetrically with respect to the center of the hollow hole formed in the center of the first current collector plate (40). In this case, the current path between the first current collector plate (40) and the first terminal (70) may be evenly distributed.

[0088] Multiple extensions (42) can be formed with the same length. In this case, the lengths of each current path between each extension (42) and the first terminal (70) can be formed uniformly.

[0089] As a result, a stable current path can be secured between the first collector plate (40) and the first terminal (70).

[0090]

[0091] Meanwhile, the hollow hole mentioned above may be a hole configured to allow welding rods or electrolytes to be injected.

[0092] Meanwhile, a second current collector plate (60) may be disposed on one side of the can housing (20). The second current collector plate (60) may be disposed inside the can housing (20). The second current collector plate (60) may be electrically connected to the first electrode (11a) and the first terminal (70). The second current collector plate (60) may have a first polarity. The second current collector plate (60) may be composed of a positive current collector plate.

[0093] Meanwhile, a first insulating gasket (80) may be disposed between the first terminal (70) and the second terminal (T). Specifically, the first insulating gasket (80) may be disposed between the first terminal (70) and the one-sided closed portion of the can housing (20) where the second terminal (T) is formed. The first insulating gasket (80) can insulate the first terminal (70) and the second terminal (T) from each other.

[0094]

[0095] FIG. 4 is an enlarged side cross-sectional view showing an extension being welded to a can housing inside a battery cell according to one embodiment of the present invention.

[0096] Hereinafter, with reference to FIGS. 2 and FIGS. 4, the case in which the extension part (42) is welded to the can housing (20) will be described in detail.

[0097] The extension (42) can be welded to the inner surface of the can housing (20). At this time, any one of several known welding methods may be adopted and applied. If the electrode assembly (10) is already placed inside the can housing (20), welding may be performed on the outside of the can housing (20). The welding may be performed using a so-called weak welding method, which proceeds with a weak welding intensity.

[0098] As described above, when the extension part (42) is welded to the inner surface of the can housing (20), the extension part (42) can be firmly connected to the can housing (20), thereby increasing the durability and electrical stability of the battery cell (1).

[0099]

[0100] During the process of welding the extension part (42) to the inner surface of the can housing (20), the extension part (42) may be spaced apart from the electrode assembly (10). Specifically, when the extension part (42) and the can housing (20) are welded together while the electrode assembly (10) is already positioned inside the can housing (20), the extension part (42) and the electrode assembly (10) may be spaced apart from each other, so that a certain gap is formed between them.

[0101] In this case, during the welding process, high-temperature welding heat can be prevented from being directly transferred from the extension (42) to the electrode assembly (10), thereby preventing damage to the electrode assembly (10).

[0102]

[0103] FIG. 5 is an enlarged side cross-sectional view showing the extension portion being in close contact with the can housing by the expansion of the electrode assembly inside the battery cell according to one embodiment of the present invention.

[0104] Hereinafter, with reference to FIGS. 2 and FIGS. 5, the case in which the extension part (42) is in close contact with the can housing (20) due to the expansion of the electrode assembly (10) will be described in detail. FIG. 5 (a) shows the extension part (42) being spaced apart from the can housing (20) before the expansion of the electrode assembly (10), and FIG. 5 (b) shows the extension part (42) being in close contact with the can housing (20) as the electrode assembly (10) expands.

[0105] The extension (42) can be placed in close contact with the inner surface of the can housing (20) by the expansion of the electrode assembly (10).

[0106] Specifically, as shown in FIG. 5 (a), the extension (42) may be spaced apart from the can housing (20) before the expansion of the electrode assembly (10). At this time, the extension (42) may be spaced apart from the electrode assembly (10) as in FIG. 5 (a), or, unlike FIG. 5 (a), may be in contact with the electrode assembly (10).

[0107] And, as shown in FIG. 5 (b), when the electrode assembly (10) is expanded, the expanded electrode assembly (10) pushes the extension (42) outward (e.g., toward the -X direction in the drawing), so that the extension (42) can be placed in close contact with the can housing (20).

[0108] The electrode assembly (10) may be configured to expand, for example, when an electrolyte is injected. To this end, the electrode assembly (10) may include a material that can expand when an electrolyte is injected. The electrolyte may be injected into the interior of the electrode assembly (10), for example, through a hollow hole in the first current collector plate (40) shown in FIG. 3.

[0109] When the extension part (42) is placed in close contact with the inner surface of the can housing (20) by the expansion of the electrode assembly (10) as described above, the extension part (42) and the can housing (20) can come into contact with each other through a simple process, and the tolerance between the extension part (42) and the electrode assembly (10) is reduced so that the energy density of the battery cell (1) can be improved and damage to the electrode assembly (10) can be prevented.

[0110]

[0111] Meanwhile, a combination of both FIG. 4 and FIG. 5 is also possible. For example, as shown in FIG. 4, the extension (42) and the can housing (20) are welded together while the extension (42) is slightly separated from the electrode assembly (10), and then, as shown in FIG. 5 (b), the electrode assembly (10) may expand and come into close contact with the extension (42). In this case, the durability and electrical stability of the battery cell (1) are increased, damage to the electrode assembly (10) can be minimized, and at the same time, the tolerance between the extension (42) and the electrode assembly (10) is reduced, thereby improving the energy density of the battery cell (1).

[0112]

[0113] FIG. 6 is an unfolded view of a first electrode and a second electrode according to an embodiment of the present invention, and FIG. 7 is an enlarged side cross-sectional view showing an extension portion extended to a position immediately preceding the first portion inside a battery cell according to an embodiment of the present invention.

[0114] Hereinafter, a battery cell (1) according to an embodiment of the present invention will be described in more detail with reference to FIGS. 2, FIGS. 6, and FIGS. 7.

[0115] In particular, with reference to FIG. 6, the first electrode (11a) and the second electrode (11b) of a battery cell (1) according to an embodiment of the present invention will be described in detail. FIG. 6 (a) and FIG. 6 (b) respectively show an unfolded view of the first electrode (11a) and an unfolded view of the second electrode (11b). In FIG. 6 (a) and FIG. 6 (b), the -X direction is a direction toward the winding axis (C), and the +X direction may be a direction toward the outer periphery of the electrode assembly (10) in the wound state.

[0116] As illustrated in FIG. 6 (a), the first electrode (11a) may have a first retaining portion (111a) and a first non-retaining portion (112a). The first retaining portion (111a) may be a portion on which an active material is laminated on one or both sides of the first electrode (11a), and the active material may be a positive active material.

[0117] The first blank portion (112a) may be a part of the first electrode (11a) in which the active material is not laminated. The first blank portion (112a) may be formed at one end of the first electrode (11a). For reference, a part of the first electrode (11a) may protrude to one side of the electrode assembly (10), and the protruding part may be the first blank portion (112a) (see FIG. 2). A plurality of first foil tabs (113a) may be formed in the first blank portion (112a), and the first foil tabs (113a) may be formed by a first notched portion (114a) formed by notching.

[0118] As illustrated in FIG. 6 (b), the second electrode (11b) may have a second retaining portion (111b) and a second non-retaining portion (112b). The second retaining portion (111b) may be a portion on which an active material is laminated on one or both sides of the second electrode (11b), and the active material may be a negative electrode active material.

[0119] The second blank portion (112b) may be a part of the second electrode (11b) where no active material is laminated. The second blank portion (112b) may be formed at the other end of the second electrode (11b). For reference, a part of the second electrode (11b) may protrude to the other side of the electrode assembly (10), and the protruding part may be the second blank portion (112b) (see FIG. 2). A plurality of second foil tabs (113b) may be formed in the second blank portion (112b), and the second foil tabs (113b) may be formed by a second notched portion (114b) formed by notching.

[0120] In particular, referring to FIG. 7, the extension portion (42) may extend to an area adjacent to the first blind portion (112a) without contacting the first blind portion (112a). Specifically, the extension portion (42) may extend to one side but not to contact the first blind portion (112a), and may extend just before the first blind portion (112a). For example, the extension portion (42) may extend to the boundary between the first blind portion (112a) and the first retaining portion (111a), or extend to a height slightly lower than the boundary between the first blind portion (112a) and the first retaining portion (111a) (based on FIG. 7).

[0121] When the extension part (42) is configured as described above, the extension part (42) can be extended as far as possible to the first non-connected part (112a) without being electrically connected to the first non-connected part (112a), so that the length of the current path between the first collector plate (40) and the first terminal (70) can be effectively reduced.

[0122]

[0123] FIG. 8 is an enlarged side cross-sectional view showing the extension portion extending to the insulating coating portion inside a battery cell according to a modified example of an embodiment of the present invention.

[0124] Hereinafter, with reference to FIGS. 2, FIGS. 6 and FIGS. 8, a battery cell (1) according to a modified example of an embodiment of the present invention will be described in detail.

[0125] In a battery cell (1) according to a modified example of one embodiment of the present invention, the extension portion (42) may extend to an insulating coating portion (115). The insulating coating portion (115) may be disposed on the outer periphery of an electrode assembly (10) in which a first electrode (11a), a second electrode (11b), and a separator (12) are wound.

[0126] The insulating coating portion (115) may be placed in the boundary area between the first non-covering portion (112a) and the first retaining portion (111a). The insulating coating portion (115) can prevent the first retaining portion (111a) of the first electrode (11a) and the second retaining portion (111b) of the second electrode (11b), which will be described later, from coming into contact with each other (see FIG. 6).

[0127] The extension portion (42) extends to one side, and may extend to the insulating coating portion (115). For example, the extension portion (42) may extend to one end of the insulating coating portion (115), or may extend to a height slightly lower than one end of the insulating coating portion (115) (based on FIG. 8).

[0128] When the extension part (42) is configured as described above, the extension part (42) can be extended as far as possible to the insulating coating part (115) without being electrically connected to the first non-insulating part (112a) by the insulating coating part (115), so that the length of the current path between the first current collector plate (40) and the first terminal (70) can be effectively reduced.

[0129]

[0130] FIG. 9 is an enlarged side cross-sectional view showing an extension portion extending to an insulator inside a battery cell according to another variation of an embodiment of the present invention.

[0131] Hereinafter, with reference to FIGS. 2, FIGS. 6 and FIGS. 9, a battery cell (1) according to another variation of an embodiment of the present invention will be described in detail.

[0132] In a battery cell (1) according to another variation of one embodiment of the present invention, the extension portion (42) may extend to an insulator (90).

[0133] An insulator (90) may be placed between the second current collector plate (60) and the can housing (20). The insulator (90) may insulate the second current collector plate (60) and the can housing (20) from each other. The insulator (90) may have a main body (91) covering one side of the second current collector plate (60) and a protrusion (92) protruding from the edge of the main body to the other side. The protrusion (92) may be placed between the electrode assembly (10) and the can housing (20). The protrusion may protrude to cover the area of ​​the first non-removable portion (112a) of the electrode assembly (10). The protrusion may extend, for example, to the boundary between the first lower portion (112a) and the first retaining portion (111a), or may protrude to a height slightly lower than the boundary between the first lower portion (112a) and the first retaining portion (111a) (based on FIG. 9).

[0134] The extension part (42) can, specifically, be extended to the other end of the protrusion as described above.

[0135] When the extension part (42) is configured as described above, the extension part (42) can be extended as far as possible to the insulator (90) without being electrically connected to the first non-electrical part (112a) by the insulator (90), so that the length of the current path between the first collector plate (40) and the first terminal (70) can be effectively reduced.

[0136]

[0137] FIG. 10 is a perspective view showing the appearance of a first current collector plate according to another variation of one embodiment of the present invention.

[0138] Hereinafter, with reference to FIG. 10, a first current collector plate (40) according to another variation of one embodiment of the present invention will be described in detail.

[0139] According to another variation of one embodiment of the present invention, the first collector plate (40) may have only one extension part (42).

[0140]

[0141] FIG. 11 is a perspective view showing the appearance of a first current collector plate according to another embodiment of the present invention.

[0142] Hereinafter, with reference to FIG. 11, a first current collector plate (40) according to another embodiment of the present invention will be described in detail.

[0143] In the first current collector plate (40) according to another embodiment of the present invention, the extension portion (42) may be provided in a cylinder shape. Specifically, the extension portion (42) may be provided in a cylinder shape to surround the outer periphery of the electrode assembly (10).

[0144] When the extension part (42) is provided as described above, the cross-sectional area (cross-section with respect to the Z-axis) of the extension part (42) can be maximized, so that the cross-sectional area of ​​the current path between the first collector plate (40) and the first terminal (70) can be maximized.

[0145]

[0146] FIG. 12 is a perspective view showing the appearance of a first current collector plate according to another embodiment of the present invention.

[0147] Hereinafter, with reference to FIG. 12, a first current collector plate (40) according to another embodiment of the present invention will be described in detail.

[0148] According to another embodiment of the present invention, the first collector plate (40) may not protrude toward the other side.

[0149] In this case, the space occupied by the first collector plate (40) inside the battery cell (1) is reduced, and the energy density of the battery cell (1) can be improved.

[0150] For example, the first collector plate (40) may be provided in a non-bridge (43) form. Specifically, the first collector plate (40) may be provided in a form that does not include a bridge (43) and a can coupling part (44).

[0151] For reference, since the first collector plate (40) has an extension part (42) that is electrically connected to the can housing (20), the first collector plate (40) can be effectively electrically connected to the can housing (20) without having a bridge (43) and a can coupling part (44).

[0152]

[0153] Meanwhile, a beading portion (21) and a crimping portion (22) may be formed in the can housing (20). The beading portion (21) may be formed by being indented inward in an area adjacent to the opening of the can housing (20). The beading portion (21) may secure the electrode assembly (10). The crimping portion (22) may be formed by extending and bending inward the end of the can housing (20) where the opening is formed. The crimping portion (22) may cover at least a portion of the opening.

[0154] A cap plate (30) may be disposed in the opening of the can housing (20). The cap plate (30) may cover the opening. The cap plate (30) may be provided with a vent portion. The vent portion may be formed by notching so that it breaks and opens under high temperature and high pressure conditions formed by a thermal event occurring inside the battery cell (1). The cap plate (30) may be fixed and sealed by a crimping portion (22).

[0155] A second insulating gasket (50) may be placed on the edge of the cap plate (30). The second insulating gasket (50) may cover the edge of the cap plate (30). The second insulating gasket (50) may seal the space between the can housing (20) and the cap plate (30) and insulate the two. The first current collector plate (40) may be fitted and joined between the beading portion (21) and the second insulating gasket (50).

[0156]

[0157] FIG. 13 is a drawing showing a battery pack according to one embodiment of the present invention.

[0158] Referring to FIG. 13, the battery pack (3) according to the present invention may include at least one battery cell (1) according to the present invention. The battery pack (3) may include a pack case (2) that accommodates at least one battery cell (1).

[0159] In the drawing, for the convenience of drawing, components such as busbars, cooling units, and external terminals for electrical connection of battery cells (1) are omitted. The structure of a plurality of battery cells (1) for manufacturing the battery pack (3) has been described above as an example.

[0160] Meanwhile, the battery pack (3) according to the present invention may further include various devices for controlling the charging and discharging of battery cells (1), such as a Battery Management System (BMS), a current sensor, a fuse, etc., although not shown.

[0161]

[0162] FIG. 14 is a drawing showing an automobile according to one embodiment of the present invention.

[0163] Referring to FIG. 14, a battery pack (3) according to one embodiment of the present invention can be applied to a vehicle (4), such as an electric vehicle or a hybrid vehicle. That is, the vehicle (4) according to the present invention may include a battery pack (3) according to the present invention. The battery pack (3) may be installed in a vehicle body frame or trunk space under the vehicle seat. In addition, the vehicle (4) according to the present invention may include various other components included in the vehicle (4) in addition to the battery pack (3). For example, the vehicle (4) according to one embodiment of the present invention may include, in addition to the battery pack (3) according to the present invention, a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0164] In addition, it is obvious that the battery pack (3) according to the present invention may also be provided in other devices, mechanisms, and facilities, such as an energy storage system using a secondary battery, in addition to a vehicle (4).

[0165]

[0166] In this specification, terms indicating directions such as up, down, left, right, front, and back have been used; however, these terms are used merely for convenience of explanation, and it is obvious to those skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0167] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

[0168] [Explanation of the symbol]

[0169] 1 : Battery cell

[0170] 2 : Pack Case

[0171] 3 : Battery pack

[0172] 4 : Cars

[0173] 10 : Electrode assembly

[0174] 11a: First electrode

[0175] 11b : Second electrode

[0176] 12: Separator

[0177] 111a : First retention part

[0178] 112a : First nostril

[0179] 113a : 1st foil tab

[0180] 114a : First notching section

[0181] 115 : Insulating coating part

[0182] 111b : Second maintenance part

[0183] 112b : Second undisturbed part

[0184] 113b : 2nd foil tab

[0185] 114b : Second notching section

[0186] 20 : Can housing

[0187] 21 : Bidding Department

[0188] 22 : Crimping part

[0189] 30 : Cap plate

[0190] 40 : 1st tribunal

[0191] 41: Electrode coupling part

[0192] 42 : Extension part

[0193] 43 : Bridge

[0194] 44 : Can connection part

[0195] 50 : Second insulation gasket

[0196] 60 : 2nd edition

[0197] 70 : First terminal

[0198] 80 : First insulation gasket

[0199] 90: Insulator

[0200] 91 : Main body

[0201] 92 : Protrusion

[0202] C: Winding axis

[0203] T : 2nd terminal

Claims

1. An electrode assembly provided by being wound around a winding axis with a separator interposed between a first electrode having a first polarity and a second electrode having a second polarity; A can housing in which the above electrode assembly is accommodated; A first terminal disposed on one side of the above-mentioned can housing and having a first polarity; A second terminal disposed on one side of the above-mentioned can housing and having a second polarity; and It includes a first current collector plate disposed on the other side of the can housing and electrically connected to the second electrode and the second terminal, The above-mentioned first collector plate is, A battery cell characterized by having at least one extension portion that extends to one side and is insulated from the first terminal.

2. In Paragraph 1, The above-mentioned first collector plate is, It is provided with an electrode coupling part coupled to the second electrode above, and The above extension part is, A battery cell characterized by being formed extending from the outermost edge of the electrode coupling portion.

3. In Paragraph 2, The above extension part is, A battery cell characterized by being integrally formed with the electrode coupling portion.

4. In Paragraph 1, The above extension part is, A battery cell characterized by being provided in multiple units.

5. In Paragraph 1, The above extension part is, A battery cell characterized by being welded to the inner surface of the can housing.

6. In Paragraph 5, The above extension part is, A battery cell characterized by being spaced apart from the electrode assembly during the process of welding to the inner surface of the can housing.

7. In Paragraph 1, The above extension part is, A battery cell characterized by being placed in close contact with the inner surface of the can housing by the expansion of the electrode assembly.

8. In Paragraph 1, A first blackout portion is provided at one end of the first electrode, and A second blank portion is provided at the other end of the second electrode, and The above extension part is, A battery cell characterized by not coming into contact with the first non-contact portion and extending to an area adjacent to the first non-contact portion.

9. In Paragraph 8, In the first electrode above, An insulating coating portion is laminated at the boundary region of the first non-retaining portion and the first retaining portion, and The above extension part is, A battery cell characterized by extending to the above-mentioned insulating coating portion.

10. In Paragraph 8, It further includes an insulator configured to insulate the first waterproof section and the can housing from each other, The above extension part is, A battery cell characterized by extending to the above-mentioned insulator.

11. In Paragraph 1, The above extension part is, A battery cell characterized by being provided in a cylinder shape.

12. In Paragraph 1, The above-mentioned first collector plate is, A battery cell characterized by not protruding toward the other side.

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

14. An automobile characterized by including at least one battery pack according to paragraph 13.

Images