Battery cell, battery pack, and vehicle including same

Abstract

A battery cell according to the present invention comprises: an electrode assembly provided by winding electrodes of different polarities around a central axis of a winding center hole in a state in which a separator is interposed between the electrodes; a cell housing accommodating the electrode assembly and having an opening at one side thereof; and a can lid coupled to one end of the cell housing and the electrode assembly, wherein the can lid and the electrode assembly are spaced apart from each other in at least one region to form an empty space therebetween.

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 in which an increase in gas and internal pressure can be effectively mitigated.

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0143304 filed on October 18, 2024, and all contents disclosed in the specification and drawings 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] Meanwhile, 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 an aluminum laminate sheet pouch, 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, in which multiple battery cells are assembled into a dense structure by overlapping or stacking them to provide high voltage and high current, and then electrically connected.

[0007] FIG. 1 is a plan view showing a can lid of a conventional battery cell. Referring to FIG. 1, the conventional battery cell may include an electrode assembly and a cell housing that accommodates it, and a can lid (300') that is coupled to an opening of the cell housing. In the can lid (300') of the conventional battery cell, the electrode coupling portion (310') that is welded to the electrode assembly is formed in a single flat shape that is entirely flat and without curvature along the periphery of the flat portion surrounding the injection port.

[0008] In such conventional battery cell can lids (300'), the flatness with respect to the electrode assembly may be unstable or inconsistent, so the welding with respect to the electrode assembly may be formed as over-welded or under-welded, resulting in poor welding quality, and the dimensions such as welding flatness with respect to the electrode assembly, welding length, and injection port diameter were not matched.

[0009] In addition, in conventional battery cells, the space between the can lid (300') and the electrode assembly is very narrow, so when gas is generated inside the battery cell and the internal pressure increases, it is considerably difficult to mitigate such gas and the increase in internal pressure. Therefore, in order to effectively mitigate the increase in gas and internal pressure that affects the long-term cycle of the battery cell, it is necessary to secure sufficient space inside the battery cell.

[0010] The present invention is conceived in consideration of the aforementioned problems and has one objective of providing a battery cell, a battery pack, and an automobile including the same, in which sufficient internal space can be secured so that the increase in gas and internal pressure can be effectively mitigated.

[0011] 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.

[0012] 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 electrodes of different polarities; a cell housing that accommodates the electrode assembly and has an opening on one side; and a can lid coupled to one end of the cell housing and the electrode assembly, wherein the can lid and the electrode assembly are spaced apart from each other in at least a portion of the area, forming an empty space between them.

[0013] The can lid may have a plurality of electrode coupling portions positioned at a location relatively closer to the electrode assembly than the surrounding portion and coupled with the electrode assembly; and at least one spacing portion configured to partition any two adjacent electrode coupling portions and spaced apart from the electrode assembly to form an empty space between them.

[0014] The empty space formed between the above-mentioned separation part and the above-mentioned electrode assembly can be in communication with the above-mentioned winding center hole.

[0015] When viewed from the axial direction, the total area of ​​the above-mentioned gap may be formed to be larger than the total area of ​​the above-mentioned electrode coupling portion.

[0016] The above can lid can be formed and arranged radially rotationally symmetrically with respect to the center of the can lid.

[0017] The can lid further comprises an injection port that opens toward the interior of the cell housing; and a flat portion surrounding the injection port, wherein the flat portion is spaced apart from the electrode assembly to form an empty space therebetween.

[0018] The flat portion has a folded portion that is recessed and folded toward the injection port side, and the can lid has an electrode coupling portion that is positioned at a location relatively closer to the electrode assembly than the surrounding portion and is coupled to the electrode assembly, and the electrode coupling portion may have a first extension portion that extends toward the folded portion and has a shape corresponding to the folded portion.

[0019] The can lid is positioned at a location relatively closer to the electrode assembly than the surrounding portion and has an electrode coupling portion coupled to the electrode assembly, and the electrode coupling portion may have at least one second extension portion extended in the circumferential direction.

[0020] The second extension portion may extend in a circumferential direction from the radially inner portion of the electrode coupling portion.

[0021] The can lid may have a plurality of electrode coupling portions positioned at a location relatively closer to the electrode assembly than the surrounding portion and coupled to the electrode assembly; and at least one bridge configured to partition any two adjacent electrode coupling portions and spaced apart from the electrode assembly to form an empty space between them.

[0022] The can lid is configured to partition any two adjacent electrode coupling portions and further comprises at least one spacing portion spaced apart from the electrode assembly to form an empty space between them, and the spacing portion may be positioned radially outward from the bridge.

[0023] The can lid is configured to partition any two adjacent electrode coupling portions and further comprises at least one spacing portion spaced apart from the electrode assembly to form an empty space between them, and the bridge may be positioned at different axial positions from the electrode coupling portion and the spacing portion.

[0024] The above can lid may have a bent notch portion configured to be broken by the internal pressure of the battery cell.

[0025] The can lid comprises a plurality of electrode coupling portions that are positioned at a location relatively closer to the electrode assembly than the surrounding portion and coupled to the electrode assembly; and at least one spacing portion configured to partition any two adjacent electrode coupling portions and spaced apart from the electrode assembly to form an empty space between them, wherein at least a portion of the vent notch portion may be in contact with the radially outer edge of the spacing portion.

[0026] A battery pack according to the present invention comprises at least one battery cell according to the present invention.

[0027] The automobile according to the present invention includes at least one battery pack according to the present invention.

[0028] According to the present invention, a battery cell, a battery pack, and an automobile including the same can be provided, in which sufficient space can be secured internally so that an increase in gas and internal pressure can be effectively relieved.

[0029] 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.

[0030] 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.

[0031] Figure 1 is a plan view showing a can lid of a conventional battery cell.

[0032] FIG. 2 is a perspective view showing the overall appearance of a battery cell according to one embodiment of the present invention.

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

[0034] FIG. 4 is a plan view showing a can lid according to one embodiment of the present invention.

[0035] FIG. 5 is a side cross-sectional view showing a part of the BB' section of FIG. 4.

[0036] Figure 6 is a side cross-sectional view showing another part of the BB' section of Figure 4.

[0037] FIG. 7 is a plan view showing a can lid according to another embodiment of the present invention.

[0038] FIG. 8 is a side cross-sectional view showing a part of the DD' section of FIG. 7.

[0039] Figure 9 is a table showing the inner diameter of the injection port, etc., according to the winding center hole size of the electrode assembly.

[0040] Figure 10 is a drawing showing a conventional separable can lid.

[0041] FIG. 11 is a table showing the results of each vent pressure measurement for a battery cell according to an embodiment and a battery cell according to a comparative example.

[0042] Figure 12 is a photograph showing a comparison of the discharge appearance of the electrode assembly after venting of the battery cell according to the embodiment and the battery cell according to the comparative example.

[0043] FIG. 13 is a drawing showing a battery pack according to one embodiment of the present invention.

[0044] FIG. 14 is a drawing showing an automobile according to one embodiment of the present invention.

[0045] 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, but 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. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0046] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0047] The statement that two subjects of comparison are identical means that they are 'substantially identical.' Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a domain may mean that it is uniform from an average perspective.

[0048] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0049] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0050] The fact that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0051] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0052] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less unless specifically stated otherwise.

[0053] Meanwhile, contents common to parts described in any one embodiment of the present invention may also be applied to other embodiments. For example, contents common to parts described in the first embodiment of the second embodiment may be replaced by the description of the first embodiment described above, and such common contents may also be applied to the second embodiment. Furthermore, contents described in the second embodiment that are applicable to the first embodiment may also be applied to the first embodiment. The same applies to other embodiments.

[0054] 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).

[0055] In this specification, for convenience of explanation, the direction following the longitudinal direction of the central axis of the winding center hole of the electrode assembly is referred to as the axial direction. The axial direction may coincide with the Z-axis direction. Furthermore, the direction surrounding the central axis of the winding center hole is referred to as the circumferential direction. Furthermore, the direction approaching or moving away from the central axis of the winding center hole is referred to as the radial direction.

[0056]

[0057] FIG. 2 is a perspective view showing the overall appearance of a battery cell according to one embodiment of the present invention, and FIG. 3 is a side cross-sectional view showing a cross- section of a battery cell according to one embodiment of the present invention.

[0058] Referring to FIGS. 2 and FIGS. 3, a battery cell (10) according to one embodiment of the present invention may include an electrode assembly (100), a cell housing (200), and a can lid (300).

[0059] The battery cell (10) may be a secondary battery configured to be rechargeable. For example, the battery cell (10) may be a cylindrical battery cell (10).

[0060] The electrode assembly (100) may comprise a first electrode and a second electrode and a separator interposed between them. The first electrode may have a first polarity, and the second electrode 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. In the following description, the first electrode may be referred to as the positive electrode and the second electrode as the negative electrode. However, in all embodiments described herein, it should be understood that the described polarities of the first electrode and the second electrode may be changed or reversed.

[0061] The electrode assembly (100) may be configured such that a first electrode and a second electrode and a separator interposed between them are laminated to form a laminate. The laminate of the first electrode, the second electrode, and the separator of the electrode assembly (100) may be wound around the central axis (A) of the winding center hole (core) (C) and provided in a jelly-roll form. The electrodes (first electrode and second electrode) may have a blank portion (112) that does not contain active material. The blank portion (112) may be located along the long side end of each electrode before winding, and after winding, the blank portion (112) may be located at the axial end of the electrode assembly (100). The blank portion (112) may have a plurality of notched foil tabs.

[0062] For example, the first electrode is an anode plate, and an anode active material is coated on one or both sides of the anode plate, and a first blank portion (112a) on which the anode active material is not coated may be formed at the end of the anode plate. The first blank portion (112a) may be formed on one side of the anode plate that extends parallel to the winding direction of the laminate. The first blank portion (112a) may be exposed to the outside by protruding axially beyond the edge of the separator while forming a plurality of winding turns around the central axis (A) of the winding center hole (C), and may be used as an electrode tab itself.

[0063] The second electrode is a negative plate, and a negative active material is coated on one or both sides of the negative plate, and a second blank portion (112b) in which the negative active material is not coated may be formed at the end of the negative plate. The second blank portion (112b) may be formed on one side of the negative plate that extends parallel to the winding direction of the laminate. The second blank portion (112b) may be exposed to the outside by protruding axially beyond the edge of the separator while forming a plurality of winding turns around the central axis (A) of the winding center hole (C), and may be used as an electrode tab itself.

[0064] The edge of the separator where the second blank portion (112b) protrudes axially may be the edge opposite in the axial direction to the edge of the separator where the first blank portion (112a) protrudes axially. Accordingly, the electrode tabs of opposite polarity may be located at opposite ends in the axial direction of the electrode assembly (100) wound thereon. For example, the first blank portion (112a) may be located at the -Z direction side end of the electrode assembly (100), and the second blank portion (112b) may be located at the +Z direction side end of the electrode assembly (100).

[0065] That is, the positive plate and the negative plate may each include an uncoated portion at the long end of the winding direction in which the active material is not coated. Additionally, the first uncoated portion (112a) and the second uncoated portion (112b) may be configured to protrude in opposite directions in the axial direction.

[0066] The first blank portion (112a) and the second blank portion (112b) may each include, for example, a plurality of foil tabs in the form of flags arranged in the winding direction. The plurality of foil tabs may be formed by notching or slitting the blank portion. In the jelly-roll type electrode assembly (100), the foil tabs may be flattened by bending them radially. The foil tabs may be bent radially inward or outward. The foil tabs may be bent one by one during the process of winding the laminate to form the jelly-roll type electrode assembly (100). Alternatively, the foil tabs may be bent all at once after winding the laminate to form the jelly-roll type electrode assembly (100). The foil tabs of the first blank section (112a) and the foil tabs of the second blank section (112b), which are folded and overlapped in the radial direction in this way, can each form a plane that is substantially perpendicular to the axial direction at both axial ends of the electrode assembly (100).

[0067] An electrode assembly (100) can be accommodated in the cell housing (200). The electrode assembly (100) can be accommodated inside the cell housing (200). The cell housing (200) can be configured in a cylindrical shape, for example. If the cell housing (200) is configured in a cylindrical shape, the battery cell (10) can be configured as a cylindrical battery cell (10).

[0068] An opening (210) may be formed on one side of the cell housing (200). For example, an opening (210) may be formed on the +Z direction side of the cell housing (200). An electrode assembly (100) may be inserted through the opening (210) formed on one side of the cell housing (200) and accommodated in the cell housing (200).

[0069] The can lid (300) can be coupled to one end of the cell housing (200) and the electrode assembly (100). Specifically, the can lid (300) can be coupled to one end of the cell housing (200) in which an opening (210) is formed.

[0070] The can lid (300) may be configured to cover the opening (210). The can lid (300) may be configured to seal the opening (210) of the cell housing (200). The can lid (300) may be press-fitted to one end of the cell housing (200). The can lid (300) may be welded to one end of the cell housing (200).

[0071] The can lid (300) can be electrically connected to the cell housing (200).

[0072] The can lid (300) can be coupled to the electrode assembly (100). The can lid (300) can be electrically connected to the electrode assembly (100). The can lid (300) can be directly coupled by contacting the electrode assembly (100). The can lid (300) can be electrically connected to the second electrode. The can lid (300) can be coupled to the second non-removable portion (112b). The can lid (300) can have a second polarity.

[0073] The can lid (300) can be electrically connected to the cell housing (200) and the electrode assembly (100), respectively. In this case, the cell housing (200) may have a second polarity.

[0074] The can lid (300) may be spaced apart from the electrode assembly (100) in at least some area to form an empty space between them. That is, the space formed between the can lid (300) and the electrode assembly (100) may be provided as an empty space.

[0075] In a battery cell (10) according to one embodiment of the present invention, as described above, a void space is formed between the can lid (300) and the electrode assembly (100), so that sufficient space can be secured inside the battery cell (10). Various gases, such as venting gas, that may be generated inside the battery cell (10) can be accommodated in the void space. Therefore, when various gases are generated inside the battery cell (10), the gases can be dispersed and accommodated in the void space, so that the increase in internal pressure of the battery cell (10) caused by gas generation can be effectively mitigated.

[0076] In addition, for example, when injecting an electrolyte into the cell housing (200), a path for the movement of the electrolyte can be secured through the empty space formed between the can lid (300) and the electrode assembly (100), so that the injection of the electrolyte can be carried out smoothly. Accordingly, the productivity of the battery cell (10) can be improved. In addition, the quality of the battery cell (10) can be improved.

[0077]

[0078] Meanwhile, the can lid (300) according to the present invention is coupled to the cell housing (200) to cover the opening (210) of the cell housing (200), and at the same time can be directly coupled to the electrode assembly (100), so, for example, a configuration such as a negative electrode current collector plate may not be separately provided. That is, the can lid (300) according to the present invention can be provided as a so-called integrated can lid (300) that can perform the function of a current collector plate.

[0079] Meanwhile, a closed portion (220) may be provided on the other side of the cell housing (200). For example, a closed portion (220) may be provided on the -Z direction side of the cell housing (200). In the cell housing (200), the closed portion (220) may be located on the opposite side of the open portion (210).

[0080] Meanwhile, the battery cell (10) according to the present invention may further include a terminal (400). The terminal (400) may be disposed in the closed portion (220). The terminal (400) may be electrically connected to the first electrode. The terminal (400) may have a first polarity. The terminal (400) may be configured in the form of a rivet that is disposed through the closed portion (220).

[0081] Meanwhile, the cell housing (200) may include a conductive metal. The cell housing (200), excluding the terminal (400), is electrically connected to the second electrode and may have a second polarity. The closure portion (220) may have a second polarity. That is, in the battery cell (10) according to the present invention, both the first polarity and the second polarity may be formed on the closure portion (220) side. An insulating gasket (500) that electrically insulates them may be disposed between the closure portion (220) and the terminal (400).

[0082] Meanwhile, the battery cell (10) according to the present invention may include a current collector plate (600). The current collector plate may have a first polarity. The current collector plate (600) may be composed of, for example, a positive current collector plate. The current collector plate (600) may be electrically connected to a first non-circulating portion (112a). The current collector plate (600) may be disposed between the electrode assembly (100) and the closing portion (220) inside the cell housing (200). An insulator (700) may be disposed between the current collector plate (600) and the closing portion (220). The insulator (700) may be configured to electrically insulate the current collector plate (600) and the closing portion (220).

[0083] Meanwhile, the cell housing (200) may be configured to extend along the axial direction parallel to the axial direction. That is, the cell housing (200) may be configured to be indented radially inward or not bent. For example, the cell housing (200) may not have a beading portion indented radially inward and / or a crimping portion bent radially inward. When the cell housing is configured in this way, the internal space of the battery cell is increased, and the space efficiency and energy density of the battery cell can be improved.

[0084]

[0085] FIG. 4 is a plan view showing a can lid according to one embodiment of the present invention, FIG. 5 is a side cross-sectional view showing a part of the BB' cross-section of FIG. 4, and FIG. 6 is a side cross-sectional view showing another part of the BB' cross-section of FIG. 4.

[0086] Referring to FIGS. 4 to 6, in a battery cell (10) according to one embodiment of the present invention, the can lid (300) may have an electrode coupling portion (310) and a separation portion (360).

[0087] The electrode coupling portion (310) can be coupled to the electrode assembly (100). For example, the electrode coupling portion (310) can be coupled to the second electrode. The electrode coupling portion (310) can be coupled to the electrode assembly (100) by welding. For example, the electrode coupling portion (310) can be coupled to the second non-coupling portion (112b) by welding.

[0088] The bottom surface of the electrode coupling portion (310) (the surface facing the electrode assembly (100)) can be coupled face-to-face with the electrode assembly (100). The bottom surface of the electrode coupling portion (310) can be coupled with the second non-reinforced portion (112b).

[0089] The electrode coupling portion (310) may be positioned at a location relatively closer to the electrode assembly (100) than the surrounding portion. Here, the surrounding portion can be understood as a part of the can lid (300) located around the electrode coupling portion (310), excluding the electrode coupling portion (310). The electrode coupling portion (310) may be positioned further down or further in the -Z direction than the surrounding portion so that it may be positioned at a location relatively closer to the electrode assembly (100) than the surrounding portion.

[0090] The electrode coupling portion (310) may be formed by being recessed toward the electrode assembly (100) along the axial direction, for example. For example, the electrode coupling portion (310) may be formed by being recessed toward the -Z direction.

[0091] The electrode coupling portion (310) may be provided in multiple numbers. For example, the electrode coupling portion (310) may be provided in three numbers. The multiple electrode coupling portions (310) may be spaced apart from each other. For example, the multiple electrode coupling portions (310) may be spaced apart from each other along the circumferential direction.

[0092] The separation portion (360) may be configured to partition any two adjacent electrode coupling portions (310). For example, the separation portion (360) may be positioned between any two electrode coupling portions (310) adjacent in the circumferential direction to partition the two separated electrode coupling portions (310).

[0093] The separation portion (360) may be separated from the electrode assembly (100). For example, the bottom surface of the separation portion (360) may be separated axially from the top surface of the electrode assembly (100). The separation portion (360) may be separated from the foil tab of the electrode assembly (100). For example, the separation portion (360) may be separated axially from the foil tab provided in the second blank portion (112b).

[0094] The separation portion (360) may be positioned at a location relatively farther from the electrode assembly (100) than the electrode coupling portion (310). For example, the separation portion (360) may be positioned further up or in the +Z direction from the electrode assembly (100) than the electrode coupling portion (310).

[0095] The separation portion (360) may be provided as at least one. For example, the separation portion (360) may be provided as only one, or as a plurality.

[0096] For example, a spacing portion (360) may be disposed between two adjacent electrode coupling portions (310). For example, an electrode coupling portion (310) may be disposed between two adjacent spacing portions (360).

[0097] The separation portion (360) may be spaced apart from the electrode assembly (100) to form an empty space between them. Various gases that may be generated inside the battery cell (10) may be contained in the empty space. Additionally, a path for the movement of the electrolyte may be secured through the empty space.

[0098] When the battery cell (10) is configured as described above, electrical connectivity between the can lid (300) and the electrode assembly (100) can be ensured by the electrode coupling portion (310). Additionally, there is an advantage that a gap can be reliably formed between the can lid (300) and the electrode assembly (100) by the spacing portion (360).

[0099]

[0100] The empty space formed between the gap portion (360) and the electrode assembly (100) can be connected to the winding center hole (C). For example, the empty space formed between the gap portion (360) and the electrode assembly (100) and another empty space between the winding center hole (C) can be configured to be connected to them.

[0101] In this case, there is an advantage that the gas receiving space and the electrolyte movement path configured as the empty space between the can lid (300) and the electrode assembly (100) can be secured over a wide range.

[0102]

[0103] In particular, referring to FIG. 4, the total area of ​​the separation portion (360) can be formed to be larger than the total area of ​​the electrode coupling portion (310). Here, the term "area" can be understood as the area occupied by each component of the separation portion (360) and the electrode coupling portion (310) in the can lid (300) when viewed from the axial direction.

[0104] The total area of ​​the separation portion (360) can be understood as the sum of the areas of all separation portions (360). For example, if multiple separation portions (360) are provided, the total area of ​​the separation portion (360) can be understood as the sum of the areas of each of the multiple separation portions (360). Likewise, the total area of ​​the electrode coupling portion (310) can be understood as the sum of the areas of all electrode coupling portions (310).

[0105] As described above, when the total area of ​​the separation portion (360) is formed to be larger than the total area of ​​the electrode coupling portion (310), there is an advantage that the empty space between the can lid (300) and the electrode assembly (100) can be more effectively secured.

[0106]

[0107] In particular, referring to FIG. 4, the can lid (300) may be configured radially rotationally symmetrically. Specifically, the can lid (300) may be formed and arranged radially rotationally symmetrically with respect to the center of the can lid (300). Here, the center of the can lid (300) may be understood, for example, as the center of the injection port (H) described later. The center of the can lid (300) may be located on the central axis (A) of the winding center hole (C). Here, being formed and arranged radially rotationally symmetrically may be understood as being repeatedly formed and arranged at a certain angle with respect to the center of the can lid (300), so that the same arrangement is repeated when rotated by the said certain angle with respect to the center of the can lid (300).

[0108] For example, a plurality of spacing portions (360) may be formed and arranged radially and rotationally symmetrically with respect to the center of the can lid (300). Each spacing portion (360) may be formed with the same shape as one another and arranged to be equal to each other with respect to the center of the can lid (300).

[0109] For example, a plurality of electrode coupling portions (310) may be formed and arranged radially and rotationally symmetrically with respect to the center of the can lid (300). Each electrode coupling portion (310) may be formed with the same shape as one another and arranged to be equal to one another with respect to the center of the can lid (300).

[0110] When the can lid (300) is configured as described above, the empty space between the can lid (300) and the electrode assembly (100) can be uniformly formed and arranged with respect to the center of the can lid (300), so that when gas is generated inside the battery cell (10) and the internal pressure increases, the gas and internal pressure can be uniformly distributed.

[0111] In addition, when the can lid (300) is configured as described above, the electrolyte movement path can also be uniformly formed and arranged.

[0112] In addition, when a plurality of electrode coupling parts (310) are configured as described above, the flatness and close contact between the can lid (300) and the electrode assembly (100) can be formed stably and evenly. Furthermore, the welding quality between the can lid (300) and the electrode assembly (100) can be improved.

[0113] In addition, since the stress applied to the can lid (300) can be effectively distributed, the rigidity of the can lid (300) can be strengthened, and thus the rigidity of the battery cell (10) can be strengthened.

[0114]

[0115] Meanwhile, particularly with reference to FIG. 6, the upper surface of the spacing portion (360) may be positioned lower than one end of the cell housing (200). Specifically, the upper surface (+Z direction side) of the spacing portion (360) may be positioned further towards the -Z direction than one end (+Z direction side) of the cell housing (200). In this case, when the battery cell (10) is positioned upright with the can lid (300) facing the bottom, the spacing portion (360) of the can lid (300) may be prevented from coming into contact with the bottom.

[0116] Meanwhile, unlike as illustrated in FIG. 6, the upper surface of the gap (360) may be positioned at the same height as one end of the cell housing (200). The height of the top of the can lid (300) in the battery cell (10) may be designed to be limited so as not to be higher than one end of the cell housing (200). When the gap (360) and the cell housing (200) are configured as above, under these design conditions, the gap (360) can be positioned at the highest position, thereby maximizing the size of the empty space between the can lid (300) and the electrode assembly (100).

[0117]

[0118] Referring to FIGS. 4 to 6, the can lid (300) may further include an injection port (H) and a flat portion (320).

[0119] The injection port (H) may be configured to open toward the interior of the cell housing (200). The injection port (H) may be configured so that the electrolyte can be injected into the interior of the cell housing (200). The injection port (H) may be located approximately in the center of the can lid (300). The center of the injection port (H) may coincide with the center of the can lid (300). The center of the injection port (H) may coincide with the central axis (A) of the winding center hole (C). The injection port (H) may be provided in an approximately circular shape.

[0120] The flat portion (320) may be configured to surround the injection port (H). The flat portion (320) may, for example, surround the injection port (H) along the circumferential direction. The flat portion (320) may be provided with a shape in which at least a portion is flat.

[0121] The flat portion (320) may be spaced apart from the electrode assembly (100). The flat portion (320) may be spaced apart from the electrode assembly (100) to form an empty space between them.

[0122] When the can lid (300) is configured as described above, the empty space between the can lid (300) and the electrode assembly (100) can be effectively secured.

[0123] Meanwhile, the empty space formed between the flat portion (320) and the electrode assembly (100) can be connected to the winding center hole (C).

[0124] Meanwhile, a void space may be formed between the spacing portion (360) and the electrode assembly (100), and a void space may also be formed between the flat portion (320) and the electrode assembly (100), and the two void spaces may be configured to be in communication with each other. Meanwhile, the void space formed between the spacing portion (360) and the electrode assembly (100), the void space formed between the flat portion (320) and the electrode assembly (100), and the winding center hole (C) may all be configured to be in communication with each other.

[0125]

[0126] FIG. 7 is a plan view showing a can lid according to another embodiment of the present invention, and FIG. 8 is a side cross-sectional view showing a part of the DD' cross-section of FIG. 7.

[0127] Hereinafter, with reference to FIGS. 7 and FIGS. 8, a battery cell (10) according to another embodiment of the present invention will be described in detail. Hereinafter, only the differences between the battery cell (10) according to one embodiment of the present invention and the battery cell (10) according to another embodiment of the present invention will be described. Features other than those described below may be commonly applied to the features of the battery cell (10) according to one embodiment of the present invention described above and below.

[0128] A can lid (300) of a battery cell (10) according to another embodiment of the present invention may have a folded portion (321) and a first extension portion (311).

[0129] Specifically, the can lid (300) may have the aforementioned flat portion (320), and the flat portion (320) may have a folded portion (321). The folded portion (321) may be formed by being indented and folded toward the injection port (H). That is, when viewed from the axial direction, the folded portion (321) may be formed in a shape that extends from the flat portion (320) toward the injection port (H). Such a folded portion (321) may form a part of the radially outer end of the flat portion (320). The folded portion (321) may be, for example, folded by being indented radially inward from the radially outer end of the flat portion (320).

[0130] Specifically, the can lid (300) may be provided with the aforementioned electrode coupling portion (310), and the electrode coupling portion (310) may be provided with a first extension portion (311). The first extension portion (311) may be extended toward the bend portion (321). Specifically, the first extension portion (311) may be extended toward the bend portion (321) from the remaining part of the electrode coupling portion (310) excluding the first extension portion (311). For example, the first extension portion (311) may be extended radially inward from the radially inner end of the electrode coupling portion (310) toward the bend portion (321).

[0131] The first extension part (311) may have a shape corresponding to the bent part (321). Specifically, the first extension part (311) may have a shape that extends toward the injection port (H) to the extent that the bent part (321) is bent and recessed toward the injection port (H). That is, the first extension part (311) may be further extended toward the injection port (H) to the extent that the bent part (321) is bent and recessed.

[0132] In this way, when the flat portion (320) of the can lid (300) is provided with a folded portion (321) and the electrode coupling portion (310) is provided with a first extension portion (311), the length (d), which is the welding length (LFW, Lid Foil tab welding) between the electrode coupling portion (310) and the foil tab, can be increased. Specifically, the welding portion where the electrode coupling portion (310) and the foil tab are welded can be extended toward the injection port (H), and as a result, the welding portion can be extended closer to the winding center hole (core) (C) of the electrode assembly (100), thereby increasing the welding length between the electrode coupling portion (310) and the foil tab. For example, as in a can lid (300) according to one embodiment of the present invention, if the can lid (300) does not have a bend portion (321) and a first extension portion (311), the length (d) may be formed to be about 9 mm (see FIG. 5), and as in a can lid (300) according to another embodiment of the present invention, if the can lid (300) has a bend portion (321) and a first extension portion (311), the length (d) may be formed to be longer to be about 12 mm (see FIG. 8).

[0133] When the welding length between the electrode coupling part (310) and the foil tab is increased in this way, the internal resistance of the battery cell (10) can be reduced.

[0134]

[0135] A can lid (300) of a battery cell (10) according to another embodiment of the present invention has the aforementioned electrode coupling portion (310), and the electrode coupling portion (310) may have a second extension portion (312).

[0136] The second extension portion (312) may extend in a circumferential direction from the electrode coupling portion (310). Specifically, the second extension portion (312) may extend in a circumferential direction from the circumferential end of the electrode coupling portion (310).

[0137] The electrode coupling portion (310) may have at least one second extension portion (312). For example, the second extension portion (312) may be provided on one side or both sides of the electrode coupling portion (310).

[0138] The second extension portion (312) may extend in the circumferential direction from the radially inner portion of the electrode coupling portion (310). Specifically, the second extension portion (312) may extend in the circumferential direction to the radially inner portion of the circumferential end of the electrode coupling portion (310).

[0139] The second extension (312) may be provided at a location adjacent to the center side or the flat portion (320) of the can lid (300). The second extension (312) may be configured to surround at least a portion of the flat portion (320).

[0140] In this way, when the electrode coupling portion (310) is provided with a second extension portion (312), the level of mitigation of gas and internal pressure increase inside the battery cell (10) can be maintained, while the area of ​​the electrode coupling portion (310) can be further secured. Accordingly, the flatness and close contact between the can lid (300) and the electrode assembly (100) can be formed stably and evenly. In addition, the resistance of the battery cell (10) can be reduced.

[0141]

[0142] A can lid (300) according to another embodiment of the present invention may have only one of the first extension part (311) and the second extension part (312), or may have both the first extension part (311) and the second extension part (312).

[0143]

[0144] Again, referring to FIGS. 4 to 6, a can lid (300) of a battery cell (10) according to one embodiment of the present invention may have a plurality of the aforementioned electrode coupling portions (310) and at least one bridge (350).

[0145] The bridge (350) may be configured to partition any two adjacent electrode coupling portions (310). For example, the bridge (350) may be positioned between any two electrode coupling portions (310) adjacent in the circumferential direction to partition the two spaced-apart electrode coupling portions (310).

[0146] The bridge (350) may be configured in an extended form. For example, the bridge (350) may be extended radially. The bridge (350) may be extended radially from the flat portion (320). The bridge (350) may be extended from the flat portion (320) toward the edge portion (370) described later. The bridge (350) may be extended from the flat portion (320) toward the aforementioned separation portion (360).

[0147] For example, the bridge (350) may be extended in a circumferential direction. The bridge (350) may be extended in a circumferential direction to surround at least a portion of the flat section (320).

[0148] The bridge (350) may be spaced apart from the electrode assembly (100). The bridge (350) may be spaced apart from the electrode assembly (100) to form an empty space between them.

[0149] When the can lid (300) is configured as described above, the empty space between the can lid (300) and the electrode assembly (100) can be effectively secured.

[0150] When the can lid (300) is equipped with a bridge (350), a plurality of electrode coupling parts (310) can be clearly partitioned and spaced apart from each other. The bridge (350) can reinforce the rigidity of the can lid (300).

[0151]

[0152] The can lid (300) further comprises at least one aforementioned gap (360), and the gap (360) may be positioned radially outward from the bridge (350).

[0153] The empty space formed between the gap portion (360) and the electrode assembly (100) can be communicated with the empty space formed between the flat portion (320) and the electrode assembly (100) or the winding center hole (C) through the empty space formed between the bridge (350) and the electrode assembly (100).

[0154]

[0155] Meanwhile, the bridge (350) may be positioned at different axial positions from the electrode coupling portion (310) and the separation portion (360). For example, the bridge (350) may be positioned further from the electrode assembly (100) than the electrode coupling portion (310) and closer to the electrode assembly (100) than the separation portion (360). In this case, the rigidity of the can lid (300) may be reinforced more strongly.

[0156]

[0157] Referring to FIGS. 4 to 6, the can lid (300) may be provided with a vent notch portion (380). The vent notch portion (380) may be configured to be broken by the internal pressure of the battery cell (10). The vent notch portion (380) may be a part configured to be broken when the internal pressure of the battery cell (10) is formed to be greater than a preset size. Specifically, when a thermal event occurs in the battery cell (10), the internal pressure of the high-temperature venting gas is formed, and when the internal pressure is formed to be greater than a preset size, the vent notch portion (380) may be broken. When the vent notch portion (380) is broken, the venting gas can be smoothly discharged from the battery cell (10) to the outside.

[0158] Meanwhile, the magnitude of the internal pressure of the battery cell (10) at which the vent notch portion (380) begins to break can be defined as the vent pressure. And, the vent pressure at which the vent notch portion (380) actually begins to break can be defined as the actual vent pressure. Furthermore, the vent notch portion (380) can be designed to be pre-set so that it breaks at a specific vent pressure, and said specific vent pressure can be defined as the pre-set vent pressure.

[0159] If the can lid (300) further includes a vent notch portion (380), the venting gas can be easily and smoothly discharged from the battery cell (10), thereby ensuring high venting performance of the battery cell (10).

[0160]

[0161] At least a portion of the vent notch (380) may come into contact with the radially outer edge of the gap (360). In this case, the area of ​​the gap (360) occupying the radially inner side of the vent notch (380) is widened, which has the advantage that the fracture of the vent notch (380) due to the internal pressure of the battery cell (10) can be easily induced.

[0162] Meanwhile, the vent notch portion (380) may be positioned radially outward from the electrode coupling portion (310). In this case, interference between the vent notch portion (380) and the electrode coupling portion (310) can be prevented. Additionally, damage to the electrode coupling portion (310) due to the notching process of the vent notch portion (380) can be prevented.

[0163]

[0164] Meanwhile, the vent notch portion (380) may be formed between the electrode coupling portion (310) and the edge portion (370) described later. The vent notch portion (380) may be formed by notching at least a portion along the circumferential direction from the radially inner side of the edge portion (370) of the can lid (300).

[0165]

[0166] Meanwhile, referring to FIGS. 4 to 6, the can lid (300) may be provided with an edge portion (370). The edge portion (370) may be formed on the edge of the can lid (300) so as to be coupled to the cell housing (200). The edge portion (370) may be coupled to an opening (210) formed on one side of the cell housing (200) by a press fit. The edge portion (370) may be coupled to the cell housing (200) by welding after being press-fitted to one side of the cell housing (200). The cross-section of the edge portion (370) may be approximately U-shaped. The end of the edge portion (370) close to the electrode assembly (100) may be spaced apart from the electrode assembly (100).

[0167] The electrode coupling portion (310) may be positioned between the flat portion (320) and the edge portion (370). That is, the flat portion (320), the electrode coupling portion (310), and the edge portion (370) may be positioned sequentially along the radial direction.

[0168] When a plurality of electrode coupling parts (310) are provided, the plurality of electrode coupling parts (310) may be spaced apart from each other, and the aforementioned spacing part (360) and / or bridge (350) may be arranged between adjacent electrode coupling parts (310). For example, the plurality of electrode coupling parts (310) may be spaced apart from each other in the circumferential direction.

[0169] Each of the multiple electrode coupling portions (310) can be positioned at a location relatively closer to the electrode assembly (100) than to the surrounding portion. When the electrode coupling portions (310) are configured in this way, the flatness with respect to the electrode assembly (100) can be stably formed, and the welding quality between the can lid (300) and the electrode assembly (100) can be improved.

[0170] A plurality of electrode coupling portions (310) may be formed and arranged radially and rotationally symmetrically with respect to the center of the can lid (300). Each electrode coupling portion (310) may be formed with the same shape as one another and arranged to be equal to each other with respect to the center of the can lid (300). In this way, when a plurality of electrode coupling portions (310) are formed and arranged symmetrically, stable flatness between the can lid (300) and the electrode assembly (100) can be more easily secured, and the electrical stability of the battery cell (10) can also be improved.

[0171] The electrode coupling portion (310) may be provided in three parts. When the electrode coupling portion (310) is provided in three parts, the multiple electrode coupling portions (310) can easily form a single plane, so stable flatness with the electrode assembly (100) can be more easily secured.

[0172] When multiple electrode coupling portions (310) are provided, a spacing portion (360) may be positioned between two electrode coupling portions (310) and an edge portion (370).

[0173] The electrode coupling portion (310) may be extended toward the flat portion (320) and the edge portion (370). Specifically, the electrode coupling portion (310) may be extended in a centripetal direction toward the flat portion (320), and the electrode coupling portion (310) may be extended radially toward the edge portion (370). In this case, since the welding length (d) between the electrode coupling portion (310) and the foil tab can be extended, the internal resistance of the battery cell (10) can be reduced (see FIG. 5 and FIG. 8).

[0174] A can lid (300) according to one embodiment of the present invention may further include a plug coupling portion (340). A plug (330) may be inserted and seated in the plug coupling portion (340) and coupled thereto. An injection port (H) may be formed in the center of the plug coupling portion (340). The plug (330) may be configured to seal the injection port (H).

[0175] The plug coupling portion (340) may be provided with an insertion portion (341) and a seating portion (342). A plug (330) may be inserted into the insertion portion (341). The plug (330) may be provided with a protrusion (331) that protrudes to be inserted into the insertion portion (341). The protrusion (331) may be coupled to the insertion portion (341) in a press-fit manner. An injection port (H) may be formed on the inner side of the insertion portion (341), and the injection port (H) may be sealed when the protrusion (331) is inserted into the insertion port.

[0176] A plug (330) may be seated in the seating portion (342). The plug (330) may be provided with an extension portion (332) to be seated in the seating portion (342). The extension portion (332) may be in a shape that extends radially from the insertion portion (341). The seating portion (342) may be formed with a step so that the extension portion (332) can be seated. The extension portion (332) and the seating portion (342) may be welded together.

[0177] As described above, when the can lid (300) further includes a plug coupling portion (340), the coupling between the plug (330) and the can lid (300) is improved, and the injection port (H) can be effectively sealed.

[0178] Meanwhile, the wider the width (b) (radial width) of the seating portion (342) formed from the injection port (H) to the inner end of the flat portion (320), the better the weldability of the extension portion (332) of the plug (330) and the seating portion (342) can be improved. The width (b) can be designed to prevent welding defects of the plug (330) caused by the heat of vaporization of the electrolyte. For example, the width (b) can be formed to be 1.0 mm or more and 2.5 mm or less. For example, the width (b) can be formed to be 2.0 mm (see FIG. 5 and FIG. 8).

[0179] Meanwhile, the width (c) (radial width) of the flat portion (320) can be formed to an appropriate length to ensure stable flatness. For example, the width (c) can be formed to be 1 mm or more and 4 mm or less. The width (c) can be formed to be, for example, 3 mm or more. If the length (c) is formed to be less than 3 mm, it may be difficult to form the flat portion (320) (see FIG. 5 and FIG. 8).

[0180] The separation portion (360) may be composed of a picking portion. Specifically, a picking area (361) that can be grasped by a picking device may be formed in the separation portion (360). The diameter of the picking area (361) may be formed, for example, from 1.0 mm to 4.0 mm, or may be formed to exceed 4.0 mm.

[0181] When the separation portion (360) is configured as a picking portion, the can lid (300) can be effectively gripped without the picking equipment coming into contact with the electrode coupling portion (310), thus preventing foreign substances from entering the electrode coupling portion (310) from the picking equipment during the picking operation of the can lid (300), and the can lid (300) can be stably gripped and transported during the assembly process of the battery cell (10).

[0182] Meanwhile, in another embodiment of the present invention, the can lid (300) can easily secure the width (c) in the remaining part of the flat portion (320) excluding the folded portion (321). In addition, the diameter (a) and / or width (b) of the liquid injection port (H) can be easily secured. In addition, the rigidity of the can lid (300) can be further reinforced. Furthermore, as the internal resistance of the battery cell (10) can be reduced, the circumferential width of the electrode coupling portion (310) (the width of the part excluding the second extension portion (312)) can be reduced, thereby securing a wider area of ​​the separation portion (360).

[0183]

[0184] Figure 9 is a table showing the inner diameter of the injection port, etc., according to the winding center hole size of the electrode assembly.

[0185] Meanwhile, referring further to FIG. 9, the injection port (H) may be a hole through which an electrolyte is injected and, at the same time, a hole through which a welding rod passes. For example, a current collector plate (e.g., a positive current collector plate) and a rivet-shaped terminal (400) may be disposed on the opposite side of the injection port (H) in the battery cell (10), and a welding rod may pass through the injection port (H) and be inserted into the winding center hole (core) (C) of the electrode assembly (100) to weld and join the current collector plate and the terminal (400). Accordingly, it may be preferable for the diameter (a) of the injection port (H) to be formed larger than the diameter of the welding rod to avoid interference with the welding rod. Additionally, the diameter (a) of the injection port (H) may be formed smaller than the inner diameter of the winding center hole (C) to ensure stable injection of the electrolyte.

[0186] FIG. 9 illustrates examples such as the inner diameter of the electrode assembly (100) after unwinding according to the size of each core, the inner diameter (a) of the injection port (H), and the diameter of the welding rod that can be inserted into the injection port (H). Here, the size of the core refers to the inner diameter of the winding center hole (C). The length (a) can be designed considering the diameter of the welding rod and the process margin.

[0187]

[0188] FIG. 10 is a drawing showing a conventional separable can lid, FIG. 11 is a table showing the results of the vent pressure measurements of a battery cell according to an embodiment and a battery cell according to a comparative example, and FIG. 12 is a photograph showing a comparison of the discharge appearance of the electrode assembly after venting of a battery cell according to an embodiment and a battery cell according to a comparative example.

[0189] The conventional can lid (300) illustrated in FIG. 10, unlike the conventional can lid (300') illustrated in FIG. 1, is included in a battery cell that includes a separate current collector (e.g., a negative current collector), and can be referred to as a separable can lid (300). The separable can lid (300) of FIG. 10 may include a portion formed in a flat shape without curvature along the circumferential direction.

[0190] The table on the left of FIG. 11 shows the actual vent pressure measurement results of 10 battery cells (10) including a can lid (300) (integrated type) according to the present invention, and the table on the right of FIG. 11 shows the actual vent pressure measurement results of 9 battery cells including a conventional can lid (300) (separable type) shown in FIG. 10.

[0191] With particular reference to FIG. 11, it can be seen that the notch thickness of the vent notch portion (380) of the can lid (300) (integrated type) according to the present invention and the thickness of the vent notch portion of a different conventional can lid (300) (separated type) are provided at levels of approximately 91 µm and 95 µm, respectively. However, the actual vent pressure of the can lid (300) (integrated type) according to the present invention was measured to be an average of 19.38 kgf / cm^2 (variation 2.05 kgf / cm^2), which is lower than the average actual vent pressure of a different conventional can lid (300) (separated type), which is 28.71 kgf / cm^2 (variation 2.92 kgf / cm^2). That is, the can lid (300) (integrated type) according to the present invention has the advantage of being able to secure the moldability of the vent notch portion (380) by securing a thickness of the vent notch portion (380) similar to that of other conventional can lids (300) (separated type), while also being able to form a lower actual vent pressure.

[0192] FIGS. 12 (a) and FIGS. 12 (b) respectively illustrate the discharge of an electrode assembly during venting of a battery cell (10) including a can lid (300) (integrated type) according to the present invention and a battery cell (10) including a different conventional can lid (300) (separable type). Referring to FIGS. 12, it can be seen that the discharge of the electrode assembly during venting is formed much more smoothly in the battery cell (10) including the can lid (300) (integrated type) according to the present invention compared to the battery cell including a different conventional can lid (300) (separable type).

[0193]

[0194] The actual vent pressure of the vent notch portion (380) of the can lid (300) (integrated type) according to the present invention may be formed to be 18.6 kgf / cm^2 or more and 20.55 kgf / cm^2 or less. If the actual vent pressure of the vent notch portion (380) is less than 18.6 kgf / cm^2, the vent notch portion (380) may break too easily, and the vent notch portion (380) may become vulnerable to external impact. And, if the actual vent pressure of the vent notch portion (380) exceeds 20.55 kgf / cm^2, the vent notch portion (380) may not break easily, and thus smooth venting performance of the battery cell (10) may not be secured.

[0195]

[0196] As the battery cell (10) according to the present invention can be configured as in the various embodiments described above, various dimensions such as the welding flat area welding length of the can lid (300), the electrode coupling portion (310), the winding center hole (C), the injection port (H), the flat portion (320), the bridge (350), the gap portion (360), the edge portion (370), and the bent notch portion (380) can be matched.

[0197]

[0198] FIG. 13 is a drawing showing a battery pack according to one embodiment of the present invention.

[0199] Referring to FIG. 13, the battery pack (30) according to the present invention may include at least one battery cell (10) according to the present invention. The battery pack (30) may include a pack case (20) that accommodates at least one battery cell (10).

[0200] In the drawing, for the convenience of drawing, components such as busbars, cooling units, and external terminals for electrical connection of the battery cells (10) have been omitted. The structure of a plurality of battery cells (10) for manufacturing the battery pack (30) has been described above as an example.

[0201]

[0202] FIG. 14 is a drawing showing an automobile according to one embodiment of the present invention.

[0203] Referring to FIG. 14, a battery pack (30) according to one embodiment of the present invention may be applied to a vehicle (40), such as an electric vehicle or a hybrid vehicle. That is, the vehicle (40) according to the present invention may include a battery pack (30) according to the present invention. The battery pack (30) may be installed in a vehicle body frame or trunk space under the vehicle seat. In addition, the vehicle (40) according to the present invention may include various other components included in the vehicle (40) in addition to the battery pack (30). For example, the vehicle (40) according to one embodiment of the present invention may include, in addition to the battery pack (30) according to the present invention, a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0204] In addition, it goes without saying that the battery pack (30) 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 (40).

[0205]

[0206] Meanwhile, although terms indicating direction such as up and down have been used in this specification, these terms are used merely for convenience of explanation, and it is obvious to a person skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0207] Although the present invention has been described above by means of 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 set forth below by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed above should be considered in an illustrative rather than a restrictive sense. That is, the scope of the true technical spirit of the present invention is indicated in the claims, and all variations within the equivalent scope thereof should be interpreted as being included in the present invention.

[0208] [Explanation of the symbol]

[0209] 10: Battery cell

[0210] 20 : Pack case

[0211] 30: Battery pack

[0212] 40 : Car

[0213] 100 : Electrode assembly

[0214] 112 : Mujibu

[0215] 112a : First nostril

[0216] 112b : Second undisturbed part

[0217] 200 : Cell housing

[0218] 210 : Opening

[0219] 220 : Closure

[0220] 300 : Can lid

[0221] 310: Electrode coupling part

[0222] 311: First extension

[0223] 312 : 2nd extension

[0224] 320 : Flat section

[0225] 321 : Bent section

[0226] 330 : Plug

[0227] 331 : Protrusion

[0228] 332 : Extension

[0229] 340 : Plug connection part

[0230] 341 : Insert

[0231] 342 : Seating part

[0232] 350 : Bridge

[0233] 360 : Separation

[0234] 361 : Picking Area

[0235] 370 : Edge part

[0236] 380 : Vent notch

[0237] 400 : Terminal

[0238] 500 : Insulating gasket

[0239] 600 : Houseplate

[0240] 700 : Insulator

[0241] C: Winding center hole

[0242] A : Central axis

[0243] H: Injection port

Claims

1. An electrode assembly provided by being wound around the central axis of a central hole, with a separator interposed between electrodes of different polarities; A cell housing that accommodates the electrode assembly and has an opening on one side; It includes one end of the cell housing and a can lid coupled to the electrode assembly, and The above can lid and the above electrode assembly are, A battery cell characterized by being spaced apart from each other in at least some areas, forming an empty space between them.

2. In Paragraph 1, The above can lid is, A plurality of electrode coupling parts disposed at a position relatively closer to the electrode assembly than the surrounding part and coupled to the electrode assembly; and A battery cell characterized by having at least one spaced portion configured to partition any two adjacent electrode coupling portions and spaced apart from the electrode assembly to form an empty space between them.

3. In Paragraph 2, The empty space formed between the above-mentioned gap and the above-mentioned electrode assembly is, A battery cell characterized by being connected to the above-mentioned winding center hole.

4. In Paragraph 2, When viewed from the axial direction, the total area of ​​the above-mentioned gap is, A battery cell characterized by being formed larger than the total area of ​​the electrode coupling portion.

5. In Paragraph 1, The above can lid is, A battery cell characterized by being formed and arranged radially and rotationally symmetrically with respect to the center of the can lid.

6. In Paragraph 1, The above can lid is, An injection port that opens toward the interior of the cell housing; and Further comprising a flat portion surrounding the above-mentioned injection port, The above flat section is, A battery cell characterized by being spaced apart from the above electrode assembly and forming an empty space therebetween.

7. In Paragraph 6, The above flat section is, It is provided with a bent portion that is recessed and bent toward the above injection port, and The above can lid is positioned at a location relatively closer to the electrode assembly than the surrounding portion and has an electrode coupling portion that is coupled to the electrode assembly. The above electrode coupling part is, A battery cell characterized by having a first extension portion that extends toward the above-mentioned bend portion and has a shape corresponding to the above-mentioned bend portion.

8. In Paragraph 1, The above can lid is positioned at a location relatively closer to the electrode assembly than the surrounding portion and has an electrode coupling portion that is coupled to the electrode assembly. The above electrode coupling part is, A battery cell characterized by having at least one second extension portion extended in the circumferential direction.

9. In Paragraph 8, The above second extension part is, A battery cell characterized by extending in the circumferential direction from the radially inner portion of the electrode coupling portion.

10. In Paragraph 1, The above can lid is, A plurality of electrode coupling parts disposed at a position relatively closer to the electrode assembly than the surrounding part and coupled to the electrode assembly; and A battery cell characterized by having at least one bridge configured to partition any two adjacent electrode coupling portions and spaced apart from the electrode assembly to form an empty space between them.

11. In Paragraph 10, The above can lid is, It further comprises at least one spacing portion configured to partition any two adjacent electrode coupling portions and spaced apart from the electrode assembly to form an empty space between them, and The above separation part is, A battery cell characterized by being positioned radially outward from the above bridge.

12. In Paragraph 10, The above can lid is, It further comprises at least one spacing portion configured to partition any two adjacent electrode coupling portions and spaced apart from the electrode assembly to form an empty space between them, and The above bridge is, A battery cell characterized by being positioned at different locations in the axial direction from the electrode coupling portion and the spacing portion.

13. In Paragraph 1, The above can lid is, A battery cell characterized by having a bent notch portion configured to be ruptured by the internal pressure of the battery cell.

14. In Paragraph 13, The above can lid is, A plurality of electrode coupling parts disposed at a position relatively closer to the electrode assembly than the surrounding part and coupled to the electrode assembly; and It is configured to partition any two adjacent electrode coupling portions and has at least one spacing portion spaced apart from the electrode assembly to form an empty space between them, and At least a portion of the above-mentioned bent notch is, A battery cell characterized by contacting the radial outer edge of the above-mentioned separation portion.

15. A battery pack characterized by including at least one battery cell according to any one of claims 1 to 14.

16. An automobile characterized by including at least one battery pack according to paragraph 15.

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