Battery cell, battery pack, and vehicle including same

Abstract

A battery cell according to the present invention comprises: an electrode assembly provided wound around the central axis of a winding center hole in a state where a separator is interposed between a first electrode having a first polarity and a second electrode having a second polarity; a can housing that accommodates the electrode assembly and includes a first half can having the first polarity, a second half can having the second polarity, and a can insulation member that insulates the first half can and the second half can from each other; and current collection assemblies respectively disposed at one end and the other end of the electrode assembly, wherein the current collection assemblies include a first current collection plate electrically connected to the first electrode and a second current collection plate electrically connected to the second electrode.

Description

Battery cells, battery packs, and automobiles including the same

[0001] The present invention relates to a battery cell, a battery pack, and an automobile including the same, and more specifically, to a battery cell, a battery pack, and an automobile including the same having reduced electrical resistance.

[0002] This application is a priority claim application for Korean Patent Application No. 10-2025-0038970 filed on March 26, 2025, 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 battery cells have a structure in which the positive and negative electrodes are formed on only one side of the battery cell or are formed separately on both sides of the battery cell. These conventional battery cells have a limitation in that the electrical resistance of the battery cell is formed relatively high because the length of the current path is formed relatively long, such as the current path inside the battery cell being formed along the entire length of the battery cell or even longer.

[0008] The present invention was conceived in consideration of the technical background described above, and has one objective of providing a battery cell with reduced electrical resistance, a battery pack, and an automobile including the same.

[0009] 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.

[0010] A battery cell according to the present invention comprises: an electrode assembly provided by being wound around the central axis of a winding center hole with a separator interposed between a first electrode having a first polarity and a second electrode having a second polarity; a can housing that accommodates the electrode assembly and has a first half-can having a first polarity, a second half-can having a second polarity, and a can insulating member that insulates the first half-can and the second half-can; and current collection assemblies disposed at one end and the other end of the electrode assembly, respectively, wherein each of the current collection assemblies has a first current collection plate electrically connected to the first electrode; and a second current collection plate electrically connected to the second electrode.

[0011] The first half-can and the first collector plate may be positioned on the first direction side, and the second half-can and the second collector plate may be positioned on the second direction side.

[0012] The first half-can has a semicircular cross-section, and the second half-can may have a semicircular cross-section symmetrical to the first half-can with respect to the electrode assembly.

[0013] The first electrode and the second electrode each have a plurality of foil tabs, and the first current collector plate can be welded to the foil tabs of the first electrode, and the second current collector plate can be welded to the foil tabs of the second electrode.

[0014] The first current collector plate can be joined by being secondarily welded to the foil tabs of the first electrode in a firstly welded state, and the second current collector plate can be joined by being secondarily welded to the foil tabs of the second electrode in a firstly welded state.

[0015] The first current collector plate may be welded to one end and the other end of the first half-can, respectively, and the second current collector plate may be welded to one end and the other end of the second half-can, respectively.

[0016] At least one of the first current collector plate and the second current collector plate may be configured in a fan shape.

[0017] Each of the above current collection assemblies may further include an insulator that insulates the first current collection plate and the second current collection plate from each other.

[0018] The first current collector plate has a first coupling part configured to be coupled with the insulator, the second current collector plate has a second coupling part configured to be coupled with the insulator, and the insulator may have a third coupling part configured to be coupled with the first coupling part and a fourth coupling part configured to be coupled with the second coupling part.

[0019] Each of the above-mentioned current collection assemblies can be configured to be symmetrical to one side and the other side.

[0020] The above can insulating member may be configured to be inserted between the first half-can and the second half-can.

[0021] The first half-can and the second half-can are spaced apart from each other, and the can insulating member may be configured to cover each end of the first half-can and the second half-can that are adjacent to each other.

[0022] A battery pack according to the present invention comprises at least one battery cell according to the present invention.

[0023] The automobile according to the present invention includes at least one battery pack according to the present invention.

[0024] According to the present invention, a battery cell with reduced electrical resistance, a battery pack, and an automobile including the same can be provided.

[0025] 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, with improved output and charging speed.

[0026] 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 current distribution is uniformly formed internally.

[0027] In addition, according to one aspect of the present invention, a battery cell with improved thermal management efficiency, a battery pack, and an automobile including the same can be provided.

[0028] 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 an electrical connection structure can be easily and efficiently implemented.

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

[0031] 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.

[0032] 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.

[0033] FIG. 1 is a perspective view showing the overall appearance of a battery cell according to one embodiment of the present invention.

[0034] Figure 2 is a perspective view of Figure 1 seen from a different direction.

[0035] FIG. 3 is a side cross-sectional view showing a part of a battery cell according to one embodiment of the present invention.

[0036] FIG. 4 is a side cross-sectional view showing another part of a battery cell according to one embodiment of the present invention.

[0037] FIG. 5 is a perspective view showing a can housing according to one embodiment of the present invention.

[0038] FIG. 6 is a diagram illustrating a current path formed in a battery cell according to one embodiment of the present invention.

[0039] FIG. 7 is a plan view showing an electrode assembly and a can housing in a state before a current collection assembly is combined in a battery cell according to one embodiment of the present invention.

[0040] FIG. 8 is a plan view showing a battery cell according to one embodiment of the present invention.

[0041] FIG. 9 is a perspective view showing the overall appearance of a battery cell according to another embodiment of the present invention.

[0042] Fig. 10 is a perspective view of Fig. 9 seen from a different direction.

[0043] FIG. 11 is a plan view showing the disassembled current collection assembly of a battery cell according to another embodiment of the present invention.

[0044] FIG. 12 is a plan view showing a current collection assembly of a battery cell according to another embodiment of the present invention.

[0045] FIGS. 13 to 15 are plan views showing an enlarged portion of a can housing according to a modified example of an embodiment of the present invention.

[0046] FIGS. 16 to 18 are enlarged plan views showing a portion of a can housing according to another variation of one embodiment of the present invention.

[0047] FIG. 19 is a plan view showing an enlarged portion of a can housing according to another variation of one embodiment of the present invention.

[0048] FIG. 20 is a perspective view showing a cap member coupled to a battery cell according to one embodiment of the present invention.

[0049] FIG. 21 is a drawing showing a battery pack according to one embodiment of the present invention.

[0050] FIG. 22 is a drawing showing an automobile 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] In this specification, unless otherwise specified, the X-axis and Y-axis directions may be left-right and front-back directions, or front-back and left-right directions, respectively, and the Z-axis direction orthogonal to the XY plane may be up-down direction (vertical direction).

[0054]

[0055] FIG. 1 is a perspective view showing the overall appearance of a battery cell according to one embodiment of the present invention, FIG. 2 is a perspective view of FIG. 1 viewed from a different direction, FIG. 3 is a side cross-sectional view showing a part of a battery cell according to one embodiment of the present invention, FIG. 4 is a side cross-sectional view showing another part of a battery cell according to one embodiment of the present invention, FIG. 5 is a perspective view showing a can housing according to one embodiment of the present invention, and FIG. 6 is a drawing for explaining a current path formed in a battery cell according to one embodiment of the present invention.

[0056] Hereinafter, a battery cell (1) according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.

[0057] In particular, referring to FIGS. 1 to 5, a battery cell (1) according to one embodiment of the present invention may include an electrode assembly (10), a can housing (20), and a current collection assembly (30).

[0058] The electrode assembly (10) may include an electrode (11) and a separator (12). The electrode (11) may include electrodes (11) of different polarities. Specifically, the electrode (11) may include a first electrode (11a) and a second electrode (11b). 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 a positive electrode and the second polarity may be a negative electrode. The separator (12) may be interposed between electrodes (11) of different polarities. The separator (12) may be interposed between the first electrode (11a) and the second electrode (11b). The separator (12) may be an insulator.

[0059] 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 the central axis (A) of the winding center hole (C). Any jelly-roll structure known in the art may be applied to the present invention without limitation.

[0060] The electrode (11) may have a retaining portion having an active material layer laminated on at least one surface and a non-retaining portion where the active material layer is not laminated. The non-retaining portion may be provided on one side (e.g., the +Z direction side) and the other side (e.g., the -Z direction side), respectively. At least a portion of the non-retaining portion may be exposed to the outside of the separator (12). The non-retaining portion may be used as an electrode tab.

[0061] The electrode (11) may be provided with a plurality of foil tabs (13). The plurality of foil tabs (13) may be formed by notching the uncoated portion. The foil tabs (13) may include a first foil tab (13a) and a second foil tab (13b). The first foil tab (13a) may be formed on the uncoated portion of the first electrode (11a). The first foil tab (13a) may be provided on one side (e.g., the +Z direction side) and the other side (e.g., the -Z direction side), respectively, of the first electrode (11a). The second foil tab (13b) may be formed on the uncoated portion of the second electrode (11b). The second foil tab (13b) may be provided on one side (e.g., the +Z direction side) and the other side (e.g., the -Z direction side), respectively, of the second electrode (11b).

[0062] The can housing (20) can accommodate the electrode assembly (10).

[0063] The can housing (20) may be provided with a first half-can (21), a second half-can (22), and a can insulating member (23). The first half-can (21) may have a first polarity. The first half-can (21) may be configured to be electrically connected to a first electrode (11a). The first half-can (21) may be configured as, for example, a positive electrode.

[0064] The second half-can (22) may have a second polarity. That is, the second half-can (22) may be configured to be electrically connected to the second electrode (11b). The second half-can (22) may be configured as a negative electrode, for example.

[0065] The first half-can (21) and the second half-can (22) may each include a conductive metal material. The first half-can (21) and the second half-can (22) may each include different metal materials, or they may include the same metal material.

[0066] The can insulating member (23) can insulate the first half-can (21) and the second half-can (22). The can insulating member (23) may include an insulating material. The can insulating member (23) may be configured to be non-polar.

[0067] The area between the first half can (21) and the second half can (22) can be formed into two, and the can insulating member (23) can be placed in each of the two areas between the first half can (21) and the second half can (22).

[0068] At least a portion of the can insulating member (23) may be positioned between the first half-can (21) and the second half-can (22). Alternatively, the can insulating member (23) may be configured to separate the first half-can (21) and the second half-can (22).

[0069] The first half-can (21), the second half-can (22), and the can insulating member (23) can be combined with each other, and the can housing (20) thus combined can be configured in a cylindrical shape, for example.

[0070] Meanwhile, the can housing (20) may have an opening (24) on one side (e.g., the +Z direction side) and on the other side (e.g., the -Z direction side), respectively. The electrode assembly (10) may be accommodated inside the can housing (20) through the opening (24).

[0071] The current collection assembly (30) can be disposed at one end (e.g., the end in the +Z direction) and the other end (e.g., the end in the -Z direction) of the electrode assembly (10), respectively. That is, the current collection assembly (30) can be provided in two and disposed on each side of the electrode assembly (10). At least a portion of the current collection assembly (30) can be electrically connected to the electrode assembly (10).

[0072] The current collection assembly (30) may be provided with a first current collection plate (31) and a second current collection plate (32). The first current collection plate (31) may be electrically connected to the first electrode (11a). The first current collection plate (31) may be electrically connected to the first foil tab (13a). The first current collection plate (31) may be electrically connected to the first electrode (11a) at one end and the other end of the electrode assembly (10), respectively.

[0073] The second current collector plate (32) can be electrically connected to the second electrode (11b). The second current collector plate (32) can be electrically connected to the second foil tab (13b). The second current collector plate (32) can be electrically connected to the second electrode (11b) at one end and the other end of the electrode assembly (10), respectively.

[0074] The first collector plate (31) and the second collector plate (32) can be placed on each side of the winding center hole (C) when viewed from the direction of the center axis (A) of the winding center hole (C).

[0075] As the battery cell (1) according to the present invention is configured as described above, the electrical resistance inside the battery cell (1) can be reduced.

[0076] Conventional battery cells had a structure in which the positive and negative electrodes were formed entirely on only one side of the battery cell or separately on both sides, resulting in a relatively long internal current path and relatively high electrical resistance.

[0077] However, with particular reference to FIG. 6, the battery cell (1) according to the present invention has both a first current collector plate (31) and a second current collector plate (32) disposed at one end of the electrode assembly (10), and both the first current collector plate (31) and the second current collector plate (32) disposed at the other end of the electrode assembly (10), so that both positive and negative electrodes can be formed at both ends of the battery cell (1). As a result, the internal current path of the battery cell (1) can be formed in both directions toward one side and the other side of the battery cell (1), so that the length of the current path is formed relatively short and the electrical resistance can be formed relatively low.

[0078] In addition, in the battery cell (1) according to the present invention, a current path having a first polarity and a current path having a second polarity can be formed in the first half-can (21) and the second half-can (22), respectively, so that the cross-sectional area of ​​the internal current path of the battery cell (1) is increased and the electrical resistance can be further reduced.

[0079] In addition, the battery cell (1) according to the present invention can have its output and charging speed improved as the electrical resistance of the battery cell (1) is reduced.

[0080] In addition, the battery cell (1) according to the present invention can have a uniform current distribution within the battery cell (1), so that the thermal deviation and heat generation within the battery cell (1) can be reduced, and thus the thermal management efficiency can be improved.

[0081] In addition, the battery cell (1) according to the present invention may have both a positive electrode and a negative electrode formed on each side, so that an electrical connection structure with an external circuit or another battery cell (1) can be easily and efficiently implemented.

[0082]

[0083] The first half can (21) and the first collector plate (31) may be positioned on the first direction side, and the second half can (22) and the second collector plate (32) may be positioned on the second direction side.

[0084] Here, the first direction can be understood as a direction perpendicular to the central axis (A) of the winding center hole (C), and the second direction as a direction opposite to the first direction. For example, the first direction may be the -Y direction and the second direction may be the +Y direction.

[0085] When the battery cell (1) is configured as described above, the first direction side of the battery cell (1) can be configured to have a first polarity, and the second direction side of the battery cell (1) can be configured to have a second polarity, so that the length of the current path inside the battery cell (1) can be minimized.

[0086]

[0087] The first half can (21) and the second half can (22) may each have a semicircular shape. Specifically, the first half can (21) may have a semicircular cross-section. Here, the term "cross-section" can be understood as a transverse section. The second half can (22) may have a semicircular cross-section (transverse section) that is symmetrical to the first half can (21) with respect to the electrode assembly (10).

[0088] In this case, the can insulation members (23) can be placed at two locations that are spaced apart from each other but face each other.

[0089] When the can housing (20) is configured as described above, the current distribution inside the battery cell (1) can be formed more uniformly. In addition, if the first half-can (21) and the second half-can (22) are made of the same material, they can be shared.

[0090]

[0091] FIG. 7 is a plan view showing an electrode assembly and a can housing in a state before a current collection assembly is combined in a battery cell according to one embodiment of the present invention, and FIG. 8 is a plan view showing a battery cell according to one embodiment of the present invention.

[0092] Referring to FIGS. 7 and 8, the first current collector plate (31) can be welded to the foil tabs (13) of the first electrode (11a), and the second current collector plate (32) can be welded to the foil tabs (13) of the second electrode (11b). The first current collector plate (31) can be welded (W2) to the first foil tab (13a), and the second current collector plate (32) can be welded (W2) to the second foil tab (13b).

[0093] In this way, when the first current collector plate (31) and the second current collector plate (32) are welded to the first electrode (11a) and the second electrode (11b), the electrical connection between the current collector assembly (30) and the electrode assembly (10) can be formed more reliably, and the rigidity of the battery cell (1) can be increased.

[0094]

[0095] Meanwhile, referring to FIG. 7, in the electrode assembly (10), first foil tabs (13a) may be arranged in the area corresponding to the first current collector plate (31), and second foil tabs (13b) may be arranged in the area corresponding to the second current collector plate (32). Also, in the electrode assembly (10), foil tabs (13) may not be arranged in the area not corresponding to the first current collector plate (31) and the second current collector plate (32).

[0096]

[0097] Referring to FIGS. 7 and 8, the first current collector plate (31) can be joined by secondary welding to the foil tabs (13) of the first electrode (11a) in a primary welded state. And, the second current collector plate (32) can be joined by secondary welding to the foil tabs (13) of the second electrode (11b) in a primary welded state. Here, the primary welding can be understood as being performed chronologically before the secondary welding.

[0098] Specifically, the first foil tabs (13a) and the second foil tabs (13b) can be welded by a first weld (W1) while in a bent or formed state. Then, the first collector plate (31) can be joined by a second weld (W2) to the first foil tabs (13a) that were welded by the first weld (W1), and the second collector plate (32) can be joined by a second weld (W2) to the first foil tabs (13a) that were welded by the first weld (W1).

[0099] When the battery cell (1) is configured as described above, the foil tabs (13) are provided by being pre-welded in a rigid state before being combined with the first current collector plate (31) and the second current collector plate (32), thereby improving the welding quality, electrical stability, and rigidity of the battery cell (1). In addition, the welding difficulty of the battery cell (1) is reduced, thereby improving productivity.

[0100]

[0101] Referring to FIGS. 7 and 8, the first collector plate (31) may be welded to one end and the other end of the first half-can (21), respectively, and the second collector plate (32) may be welded to one end and the other end of the second half-can (22), respectively.

[0102] Specifically, the first collector plate (31) and the second collector plate (32) can each be welded together by a third weld (W3) to one end of the first half can (21) (+Z direction side end) and one end of the second half can (22), as shown in FIG. 8. Additionally, although not shown in the drawings, the first collector plate (31) and the second collector plate (32) can each be welded together by a third weld (W3) to the other end of the first half can (21) (-Z direction side end) and the other end of the second half can (22) (-Z direction side end).

[0103] When the battery cell (1) is configured as described above, the can housing (20) and the current collection assembly (30) can be directly connected, thereby allowing the electrical connection between the can housing (20) and the electrode assembly (10) to be formed more reliably. Additionally, the can housing (20), the current collection assembly (30), and the electrode assembly (10) are strongly connected to each other, so that the rigidity of the battery cell (1) can be improved.

[0104]

[0105] Again, referring to FIGS. 1 and FIGS. 2, at least one of the first collector plate (31) and the second collector plate (32) may be configured in a fan shape. Both the first collector plate (31) and the second collector plate (32) may be formed in a fan shape.

[0106] The first collector plate (31) and the second collector plate (32) can be formed and arranged in a symmetrical shape relative to each other with respect to the central axis (A) of the winding center hole (C).

[0107] When the current collection assembly (30) is configured as described above, the first current collection plate (31) and the second current collection plate (32) can be separated and arranged clearly and easily. As a result, the possibility of interference between the first current collection plate (31) and the second current collection plate (32) can be significantly reduced.

[0108]

[0109] FIG. 9 is a perspective view showing the overall appearance of a battery cell according to another embodiment of the present invention, and FIG. 10 is a perspective view of FIG. 9 viewed from a different direction.

[0110] Hereinafter, a battery cell (1) according to another embodiment of the present invention will be described in detail with reference to FIGS. 9 and FIGS. 10. The current collection assembly (30) of the battery cell (1) according to another embodiment of the present invention may further include an insulator (33).

[0111] The insulator (33) may be provided in each current collection assembly (30) disposed at one end and the other end of the electrode assembly (10).

[0112] The insulator (33) may be configured to insulate the first collector plate (31) and the second collector plate (32) from each other. The insulator (33) may include an insulating material.

[0113] The insulator (33) may be placed between the first collector plate (31) and the second collector plate (32). The insulator (33) may have a shape corresponding to the area between the first collector plate (31) and the second collector plate (32), and may be configured to occupy the entire area between the first collector plate (31) and the second collector plate (32).

[0114] In a battery cell (1) according to another embodiment of the present invention, the first current collector plate (31) and the second current collector plate (32) can be reliably insulated from each other by an insulator (33).

[0115]

[0116] FIG. 11 is a disassembled plan view of a battery cell current collection assembly according to another embodiment of the present invention, and FIG. 12 is a plan view of a battery cell current collection assembly according to another embodiment of the present invention.

[0117] Hereinafter, with reference to FIGS. 11 and FIGS. 12, a battery cell (1) according to another embodiment of the present invention will be described in detail. The current collection assembly (30) of the battery cell (1) according to another embodiment of the present invention may further include an insulator (33), and the first current collection plate (31) and the second current collection plate (32) may be configured to be coupled to the insulator (33).

[0118] Specifically, the first collector plate (31) may be provided with a first coupling part (34) configured to be coupled with an insulator (33), and the second collector plate (32) may be provided with a second coupling part (35) configured to be coupled with an insulator (33). Additionally, the insulator (33) may be provided with a third coupling part (36) configured to be coupled with the first coupling part (34) and a fourth coupling part (37) configured to be coupled with the second coupling part (35).

[0119] The first coupling part (34) and the second coupling part (35) may be configured, for example, to have at least one through hole. The third coupling part (36) and the fourth coupling part (37) may be configured, for example, to have at least one projection that can be inserted into the through hole.

[0120] The first connecting portion (34) and the second connecting portion (35) may be configured to include, for example, a portion extending toward the insulator (33) from an edge adjacent to the insulator (33). The third connecting portion (36) and the fourth connecting portion (37) may be configured to include a recessed portion to accommodate the first connecting portion (34) and the second connecting portion (35), for example.

[0121] In another embodiment of the present invention, the battery cell (1) can have the first current collector plate (31) and the second current collector plate (32) effectively and easily combined with the insulator (33), thereby improving the rigidity and productivity of the battery cell (1).

[0122]

[0123] Again, referring to FIGS. 1, FIGS. 2, FIGS. 9 and FIGS. 10, each current collection assembly (30) can be configured to be symmetrical to one side and the other side. That is, the current collection assembly (30) placed on one side of the electrode assembly (10) and the current collection assembly (30) placed on the other side of the electrode assembly (10) can be formed and arranged to be symmetrical to each other in the Z-axis direction with respect to the electrode assembly (10).

[0124] When the battery cell (1) is configured as described above, the current distribution inside the battery cell (1) can be made more uniform. Additionally, there is an effect that the battery cell (1) can function as the same battery cell (1) even when inverted.

[0125]

[0126] FIGS. 13 to 15 are plan views showing an enlarged portion of a can housing according to a modified example of an embodiment of the present invention.

[0127] Referring to FIGS. 13 to 15, in a battery cell (1) according to a modified example of one embodiment of the present invention, the can insulating member (23) may be configured in a fitted form.

[0128] Specifically, the can insulating member (23) can be configured to be inserted between the first half-can (21) and the second half-can (22).

[0129] The can insulation member (23) can be configured to have an 'H' shaped cross section and a length in the Z-axis direction so that the first half-can (21) and the second half-can (22) can be inserted from both sides, for example, as shown in FIG. 13.

[0130] The can insulating member (23) may be configured to have a length in the Z-axis direction and a cross-section in which at least a portion protrudes outward so as to be sandwiched between the first half-can (21) and the second half-can (22), for example, as shown in FIG. 14. Here, "outward" can be understood as the radial side.

[0131] The can insulating member (23) may be configured to have a length in the Z-axis direction and a cross-section in which at least a portion protrudes inward so as to be sandwiched between the first half-can (21) and the second half-can (22), for example, as shown in FIG. 15. Here, "inward" can be understood as the centripetal direction side.

[0132] When the can insulating member (23) is configured to be sandwiched between the first half-can (21) and the second half-can (22), as in the examples of FIGS. 13 to 15, the first half-can (21) and the second half-can (22) can be insulated from each other reliably and efficiently.

[0133]

[0134] FIGS. 16 to 18 are enlarged plan views showing a portion of a can housing according to another variation of one embodiment of the present invention.

[0135] Referring to FIGS. 16 to 18, in a battery cell (1) according to another variation of one embodiment of the present invention, the can insulating member (23) may be configured to cover each end of the first half can (21) and the second half can (22).

[0136] The can insulating member (23) may be configured to cover each end of the first half-can (21) and the second half-can (22) adjacent to each other from the inside, for example, as shown in FIG. 16. The can insulating member (23) may be provided in a form that surrounds a part of the outer periphery of the electrode assembly (10), or may be provided in a cylindrical form that surrounds the entire outer periphery of the electrode assembly (10).

[0137] The can insulating member (23) may be configured to cover each end of the first half-can (21) and the second half-can (22) adjacent to each other from the outside, for example, as shown in FIG. 17. The can insulating member (23) may be provided in a form that surrounds a part of the outer periphery of the electrode assembly (10), or may be provided in a cylindrical form that surrounds the entire outer periphery of the electrode assembly (10).

[0138] The can insulating member (23) may be configured in a combination of FIG. 16 and FIG. 17, for example, as shown in FIG. 18.

[0139] When the can insulating member (23) is configured to cover each end of the first half can (21) and the second half can (22), as in the examples of FIGS. 16 to 18, the first half can (21) and the second half can (22) can be insulated from each other reliably and efficiently.

[0140]

[0141] FIG. 19 is a plan view showing an enlarged portion of a can housing according to another variation of one embodiment of the present invention.

[0142] Referring to FIG. 19, in a battery cell (1) according to another variation of an embodiment of the present invention, the can insulating member (23) may be configured to have a spacer (25). The spacer (25) may be configured to be placed between the first half-can (21) and the second half-can (22) to space them apart from each other. The spacer (25) may include an insulating material. The can insulating member (23) may be configured to cover at least one of the inner and outer sides of the spacer (25), and may be configured in the form of a tape.

[0143]

[0144] FIG. 20 is a perspective view showing a cap member coupled to a battery cell according to one embodiment of the present invention.

[0145] Referring to FIG. 20, a battery cell (1) according to one embodiment of the present invention may further include a cap member (40). The cap member (40) may be disposed on one side (e.g., the +Z direction side) and the other side (e.g., the -Z direction side) of the battery cell (1), respectively. Each cap member (40) may be configured to be symmetrical to one side and the other side of the battery cell (1).

[0146] The cap member (40) may be configured to cover the electrode assembly (10) and the current collection assembly (30). The cap member (40) may be coupled to the end of the opening (24) of the can housing (20).

[0147] The cap member (40) may be provided with a first pole terminal having a first polarity and a second pole terminal having a second polarity. The cap member (40) may be provided with an insulating region (41). The insulating region (41) may be an area that insulates the first pole terminal and the second pole terminal. The insulating region (41) may, for example, be in a shape that crosses approximately the center of the cap member (40), but this is merely an example. Unlike the example of FIG. 20, the cap member (40) may be configured with various structures, such as having a rivet-shaped part.

[0148]

[0149] FIG. 21 is a drawing showing a battery pack according to one embodiment of the present invention.

[0150] Referring to FIG. 21, 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).

[0151] 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.

[0152]

[0153] FIG. 22 is a drawing showing an automobile according to one embodiment of the present invention.

[0154] Referring to FIG. 22, a battery pack (3) according to one embodiment of the present invention may 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.

[0155] 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).

[0156]

[0157] 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.

[0158] 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.

[0159] [Explanation of the symbol]

[0160] 1 : Battery cell

[0161] 2 : Pack Case

[0162] 3 : Battery pack

[0163] 4 : Cars

[0164] 10 : Electrode assembly

[0165] 11: Electrode

[0166] 11a: First electrode

[0167] 11b : Second electrode

[0168] 12 : Separator

[0169] 13 : Foil Tab

[0170] 13a : 1st foil tab

[0171] 13b : 2nd foil tab

[0172] 20 : Can housing

[0173] 21 : 1st Half Can

[0174] 22 : 2nd Half-Can

[0175] 23 : Can insulation member

[0176] 24 : Opening

[0177] 25 : Spacer

[0178] 30 : Current collector assembly

[0179] 31 : First tribunal

[0180] 32 : Second edition

[0181] 33: Insulator

[0182] 34: First connecting part

[0183] 35 : Second connecting part

[0184] 36 : Third connecting part

[0185] 37 : 4th connecting part

[0186] 40 : Cap member

[0187] 41: Insulation area

[0188] C: Winding center hole

[0189] A : Central axis

Claims

1. An electrode assembly provided by being wound around the central axis of a winding center hole, with a separator interposed between a first electrode having a first polarity and a second electrode having a second polarity; A can housing having the electrode assembly and a first half-can having a first polarity, a second half-can having a second polarity, and a can insulating member insulating the first half-can and the second half-can; and It includes a current collection assembly disposed at one end and the other end of the electrode assembly, respectively, and Each of the above-mentioned current collection assemblies is, A first current collector plate electrically connected to the first electrode; and A battery cell characterized by having a second current collector plate electrically connected to the second electrode.

2. In Paragraph 1, The first half-can and the first collector plate are positioned on the first direction side, and A battery cell characterized in that the second half-can and the second current collector plate are positioned on the second direction side.

3. In Paragraph 1, The above-mentioned first half-can is, Having a semicircular cross-section, The above second half-can is, A battery cell characterized by having a semicircular cross-section symmetrical to the first half-can with respect to the electrode assembly.

4. In Paragraph 1, The first electrode and the second electrode each have a plurality of foil tabs, and The above-mentioned first collector plate is, The foil tabs of the first electrode are welded together, The above second collector plate is, A battery cell characterized by being welded to the foil tabs of the second electrode.

5. In Paragraph 4, The above-mentioned first collector plate is, The foil tabs of the first electrode in the first welded state are secondarily welded and joined, and The above second collector plate is, A battery cell characterized by being secondarily welded and joined to the foil tabs of the second electrode in a firstly welded state.

6. In Paragraph 1, The above first collector plates are each, One end and the other end of the first half-can are welded together, The above second collector plates are each, A battery cell characterized by being welded to one end and the other end of the second half-can.

7. In Paragraph 1, At least one of the first current collector plate and the second current collector plate is, A battery cell characterized by being configured in a fan shape.

8. In Paragraph 1, Each of the above-mentioned current collection assemblies is, A battery cell characterized by further comprising an insulator that insulates the first current collector plate and the second current collector plate from each other.

9. In Paragraph 8, The above-mentioned first collector plate is, It has a first coupling part configured to be coupled with the above-mentioned insulator, and The above second collector plate is, It has a second coupling part configured to be coupled with the above-mentioned insulator, and The above insulator is, A battery cell characterized by having a third coupling part configured to be coupled to the first coupling part and a fourth coupling part configured to be coupled to the second coupling part.

10. In Paragraph 1, Each of the above-mentioned current collection assemblies is, A battery cell characterized by being configured to be symmetrical to one side and the other side.

11. In Paragraph 1, The above can insulating member is, A battery cell characterized by being configured to be inserted between the first half can and the second half can.

12. In Paragraph 1, The first half-can and the second half-can are spaced apart from each other, The above can insulating member is, A battery cell characterized by being configured to cover each end of the first half-can and the second half-can adjacent to each other.

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.

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