Cylindrical battery, current collector for use in the same, battery pack including the same, and automobile

Abstract

The present application provides a cylindrical battery and a current collector applied thereto, a battery pack including the same, and an automobile. The current collector can include a ring portion surrounding a center axis of an electrode assembly so as to define an opening region in which an electrode tab composed of a non-coated portion is exposed at a side end of the electrode assembly, a tab coupling portion extending from an inner side of the ring portion adjacent to the opening region toward the opening region and coupled with the electrode tab exposed through the opening region, and a case coupling portion extending from an outer side of the ring portion toward an inner circumferential surface of a battery case and coupled with the battery case.

Description

TECHNICAL FIELD

[0001] The present application relates to a cylindrical battery and a current collector applied thereto, a battery pack including the same, and an automobile. In more detail, the present application relates to a current collector having a structure capable of preventing damage to a welded portion of an electrode assembly even when an external impact is applied, a cylindrical battery including the same, a battery pack including the cylindrical battery, and an automobile. BACKGROUND

[0002] A conventional cylindrical battery generally has a structure in which a tab connecting a jelly-roll and an external terminal is welded to a foil of the jelly-roll to achieve connection. The current path of the cylindrical battery of such a structure is limited, and the resistance of the jelly-roll itself is very high.

[0003] Accordingly, an attempt has been made to reduce the resistance by increasing the number of tabs connecting the jelly-roll and the external terminal, but there is a limitation in reducing the resistance to a desired level and securing a sufficient current path (path) only by such an increase in the number of tabs.

[0004] Accordingly, in order to reduce the resistance of the jelly-roll itself, it is necessary to develop a new jelly-roll structure and a current collector structure suitable for such a jelly-roll structure. In particular, the necessity of such a new jelly-roll structure and a current collector structure is greater in a device requiring a battery pack having a high output / high capacity, such as an electric vehicle.

[0005] Also, with respect to such a battery pack applied to an electric vehicle or the like, it is inevitable to be frequently exposed to vibration and impact in consideration of the use environment. Accordingly, it is necessary to develop a cylindrical battery having a structure in which the risk of damage to a welded portion is low even when vibration and an external impact are applied, and a current collector structure applied to such a cylindrical battery.

[0006] Also, it is necessary to develop a cylindrical battery having a structure maintaining a state in which the bonding force between a current collector and a battery case is improved, and a current collector structure applied to such a cylindrical battery.

[0007] Furthermore, the necessity of developing a cylindrical battery in which the energy density of the cylindrical battery is improved by minimizing a dead angle inside the battery case when the current collector is bonded to the battery case is proposed. SUMMARY

[0008] Technical Problem to be Solved

[0009] The present application is made in view of the above-described problems, and aims to provide a current collector having a structure suitable for an electrode assembly having a low-resistance structure, and a cylindrical battery including the same.

[0010] Also, an object of the present application is to provide a current collector having a structure capable of improving the bonding force of the bonding site of the current collector and the battery case, and a cylindrical battery including the same.

[0011] Also, an object of the present application is to provide a current collector having a structure capable of greatly reducing the possibility of damage to the welding site with the electrode assembly and / or the welding site with the battery case even if vibration and impact are applied, and a cylindrical battery including the same.

[0012] Also, an object of the present application is to provide a current collector having a structure capable of improving the energy density of a cylindrical battery, and a cylindrical battery including the same.

[0013] Also, an object of the present application is to provide a current collector having a structure capable of improving the convenience of a welding process for achieving electrical connection of the battery case and the current collector when manufacturing a cylindrical battery, thereby capable of improving productivity, and a cylindrical battery including the same.

[0014] The technical problems to be solved by the present application are not limited to the above objects, and other objects and advantages of the present application can be understood by the following description, and will be further appreciated by the embodiments of the present application. Also, it will be easily understood that the objects and advantages of the present application can be achieved by the means shown in the claims and combinations thereof.

[0015] Means for solving the technical problems

[0016] The current collector usable in the cylindrical battery according to the present application for solving the above technical problems can achieve electrical connection between the electrode assembly and the battery case included in the cylindrical battery.

[0017] The above current collector can electrically connect the electrode tab composed of the uncoated portion exposed at the one side end of the electrode assembly and the inner circumferential surface of the battery case to each other.

[0018] At least a portion of the above current collector can be in face-to-face contact with the above electrode tab. Also, at least another portion of the above current collector can be in face-to-face contact with the inner circumferential surface of the above battery case.

[0019] The electrical connection portion of the above current collector can be fixed by welding.

[0020] The above current collector can include a ring-shaped portion surrounding the central axis of the above electrode assembly so as to be capable of defining an opening region of the electrode tab composed of the uncoated portion exposed at the one side end of the above electrode assembly.

[0021] The center of the above ring-shaped portion can be provided with a current collector hole. The above current collector hole can communicate with the winding hole of the above electrode assembly.

[0022] The aforementioned annular portion can form a closed loop surrounding the aforementioned current collector hole.

[0023] The aforementioned annular portion may have one or more cut portions. When the aforementioned annular portion has cut portions, it can be considered that the aforementioned annular portion substantially constitutes a closed loop.

[0024] The current collector may include a tab connection portion that extends from the inside of the annular portion adjacent to the opening region toward the opening region and is connected to the electrode tab exposed through the opening region.

[0025] The aforementioned tab connection can extend from the aforementioned annular portion in the centripetal direction toward the aforementioned electrode assembly.

[0026] The aforementioned tab joint can be extended into a straight line shape, an arc shape, or a combination of these shapes.

[0027] The current collector may include a housing joint that extends from the outside of the annular portion toward the inner circumferential surface of the battery housing and is joined to the battery housing.

[0028] The extension directions of the aforementioned tab joint and the aforementioned housing joint can be separated from each other along the circumferential direction of the aforementioned electrode assembly.

[0029] The aforementioned annular portion may include: a plurality of first portions that are separated along the circumferential direction from a first radial position of the exposed area of ​​the aforementioned electrode tab; a plurality of second portions that are disposed between adjacent first portions along the circumferential direction at a second radial position outside the aforementioned first radial position; and a third portion that connects the adjacent first portions and the second portions located between them in the circumferential direction, thereby defining the space for the extension of the aforementioned tab connection portion.

[0030] The first part, the second part, and the third part mentioned above may be located on the same plane.

[0031] The aforementioned tab connection can extend from the aforementioned second part toward the center of the aforementioned electrode assembly.

[0032] There may be a gap between the aforementioned tab joint and the aforementioned third part.

[0033] The third part described above can be extended into a straight line shape, an arc shape, or a combination of both. Similarly, the gap described above can be extended into a straight line shape, an arc shape, or a combination of both.

[0034] The aforementioned opening area can extend radially from the center of the aforementioned electrode assembly.

[0035] The aforementioned tab connection and the aforementioned housing connection can be connected via the aforementioned annular portion.

[0036] The tab coupling portion can extend from the second portion toward the radial direction, and the case coupling portion can extend from the first portion toward the diametrical direction.

[0037] The case coupling portion can include a contact portion that contacts the battery case, and a connection portion that connects between the contact portion and the ring-shaped portion.

[0038] The contact portion can extend in the circumferential direction of the inner circumferential surface of the battery case.

[0039] The connection portion can extend in the diametrical direction and the axial direction of the electrode assembly.

[0040] The connection portion can have one or more curved portions. The curved portion can be provided in a region adjacent to the contact portion. The curved portion can protrude in the radial direction. Alternatively, the curved portion can protrude in the axial direction of the electrode assembly.

[0041] The present application can provide a cylindrical battery including the current collector.

[0042] The cylindrical battery can accommodate an electrode assembly in a cylindrical jelly-roll structure.

[0043] The electrode assembly can include a first electrode tab exposed on one side in the axial direction and composed of a coating-free portion.

[0044] The current collector can be electrically connected to the first electrode tab of the electrode assembly.

[0045] The electrode assembly can include a second electrode tab exposed on the other side in the axial direction and composed of a coating-free portion. The second electrode tab can have a polarity opposite to that of the first electrode tab.

[0046] An open portion can be provided on one side in the axial direction of the battery case, and the case coupling portion can be connected to the inner circumferential surface of the battery case in which the open portion is provided.

[0047] A crimped portion can be provided on one side in the axial direction of the battery case and recessed in the radial direction.

[0048] The case coupling portion can be connected to the inner circumferential surface of the crimped portion.

[0049] The case coupling portion can be connected to the inner circumferential surface of the crimped portion by welding or the like.

[0050] The cylindrical battery can further include a case cover that covers the open portion.

[0051] The case cover can be fixed to the battery case with a gasket interposed therebetween.

[0052] The housing coupling portion can be fixed by being sandwiched between the closure gasket and the crimping portion.

[0053] The second electrode tab can be electrically connected to a terminal provided at the other side of the axial direction of the battery case.

[0054] A cylindrical battery according to an embodiment of the present application to solve the above technical problem can include: an electrode assembly having a first electrode tab and a second electrode tab; a battery case accommodating the electrode assembly through an open portion formed at one side; a current collector contacting the first electrode tab and an inner circumferential surface of the battery case to electrically connect the first electrode tab and the battery case, and including a peripheral edge surrounding a center axis of the electrode assembly on an exposed surface of the first electrode tab to define a ring-shaped portion exposing an opening area of the first electrode tab; a tab coupling portion extending from an inner side of the ring-shaped portion adjacent to the opening area toward the opening area and coupled to the first electrode tab exposed through the opening area; and a case coupling portion extending from an outer side of the ring-shaped portion toward the inner circumferential surface of the battery case and coupled to the battery case; a case cover covering the open portion; and a terminal penetrating the battery case at the opposite side of the open portion and electrically connected to the second electrode tab.

[0055] The ring-shaped portion can include: a plurality of first portions disposed apart from each other in a circumferential direction from a first radius position of the exposed area of the first electrode tab; a plurality of second portions disposed between the first portions adjacent to each other in the circumferential direction at a second radius position outside the first radius position; and a third portion connecting the first portions adjacent to each other in the circumferential direction and the second portions therebetween to define a space in which the tab coupling portion extends.

[0056] The tab coupling portion can extend from the second portion toward a centripetal direction of the electrode assembly.

[0057] A gap can be provided between the tab coupling portion and the third portion.

[0058] The tab coupling portion can extend in a linear shape, an arcuate shape, or a shape combining the same. Similarly, the third portion can extend in a linear shape, an arcuate shape, or a shape combining the same. Similarly, the gap can extend in a linear shape, an arcuate shape, or a shape combining the same.

[0059] The opening area can extend radially from the center of the electrode assembly.

[0060] A distance from the inner side of the ring-shaped portion to an edge of a winding hole of the electrode assembly can be greater than or the same as a length of the tab coupling portion.

[0061] An open portion can be provided at an axial side of the battery case, and the case coupling portion can be coupled to an inner circumferential surface of the battery case provided with the open portion.

[0062] The case coupling portion can be provided near the open portion of the battery case and coupled to an inner circumferential surface of a crimped portion recessed toward a radial direction.

[0063] The cylindrical battery according to the present application can further include a case cover covering the open portion, and a sealing gasket interposed between the case cover and the battery case, wherein the case coupling portion is interposed between the sealing gasket and the crimped portion to be fixed.

[0064] A winding hole can be provided at a center of the electrode assembly, and a current collector hole facing the winding hole can be provided at a center of the ring-shaped portion.

[0065] The tab coupling portion and the case coupling portion can be connected via the ring-shaped portion. The tab coupling portion can extend toward a radial direction from the second portion, and the case coupling portion can extend toward a tangential direction from the first portion.

[0066] The ring-shaped portion can form a closed loop. Alternatively, the ring-shaped portion can have one or more cut portions.

[0067] The case coupling portion can include a contact portion coupled to an inner circumferential surface of the battery case, and a connection portion connecting between the contact portion and the ring-shaped portion.

[0068] The contact portion can extend in a direction corresponding to a circumferential direction of the inner circumferential surface of the battery case.

[0069] The connection portion can extend in a tangential direction and an axial direction.

[0070] The connection portion can have one or more bent portions. The bent portion can protrude in a radial direction or an axial direction of the electrode assembly.

[0071] On the other hand, a battery pack according to an embodiment of the present application can include a plurality of cylindrical batteries according to an embodiment of the present application as described above.

[0072] A vehicle according to an embodiment of the present application can include a plurality of battery packs according to an embodiment of the present application as described above.

[0073] Effects of Invention

[0074] According to the present application, it is possible to significantly reduce electrical resistance when electrically connecting an electrode assembly and a battery case.

[0075] Moreover, according to the present application, the adhesion of the collector to the battery case can be improved.

[0076] Furthermore, according to the present application, the energy density of the cylindrical battery can be improved.

[0077] Moreover, according to the present application, the convenience of the welding process for electrically connecting the battery case and the collector can be improved when manufacturing the cylindrical battery, and thus the productivity can be improved.

[0078] Furthermore, according to the present application, even if vibrations and impacts are applied during use of the battery, the possibility of damage occurring at the welding site between the collector and the electrode assembly and / or the welding site between the collector and the battery case can be greatly reduced.

[0079] The above effects and specific effects of the present application will be described below while describing specific matters for carrying out the present application. BRIEF DESCRIPTION OF DRAWINGS

[0080] The following drawings attached to the present specification schematically show preferred embodiments of the present application, and serve to further explain the technical idea of the present application together with the detailed description of the present application described later, and should not be interpreted as limiting the present application to the matters shown in these drawings.

[0081] Figure 1 is a sectional view showing the internal structure of a cylindrical battery according to an embodiment of the present application.

[0082] Figure 2 is a view showing a collector according to an embodiment of the present application.

[0083] Figure 3 is a view showing a collector according to another embodiment of the present application.

[0084] Figure 4 is a sectional view showing the internal structure of a cylindrical battery according to another embodiment of the present application.

[0085] Figure 5 is a view showing a collector according to still another embodiment of the present application.

[0086] Figure 6 is a sectional view showing the internal structure of a cylindrical battery according to still another embodiment of the present application.

[0087] Figure 7 is a view showing a collector according to yet another embodiment of the present application.

[0088] Figures 8 to 10 are side views of each case adhesion portion of a collector according to an embodiment of the present application, respectively.

[0089] Figure 11 is a view showing a current collector according to still another embodiment of the present application.

[0090] Figure 12 is a view showing a current collector according to still another embodiment of the present application.

[0091] Figure 13 and Figure 14 are each a side view of a case joint of a current collector according to still another embodiment of the present application.

[0092] Figure 15 is a view showing a current collector according to still another embodiment of the present application.

[0093] Figure 16 is a view showing a current collector according to still another embodiment of the present application.

[0094] Figure 17 is a plan view of the current collector of Figure 16

[0095] Figure 18 is a plan view of a modification of the current collector of Figure 16

[0096] Figure 19 is a view showing a battery pack according to an embodiment of the present application.

[0097] Figure 20 is a view showing an automobile according to an embodiment of the present application. DETAILED DESCRIPTION

[0098] The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which like reference numerals refer to like elements in the several views. A detailed description of the above described purpose, features and advantages will be given hereinafter in the course of the specification, and thus the technical idea of the present application can be easily carried out by those skilled in the art to which the present application pertains. In explaining the present application, when it is judged that a detailed description of the known technology related to the present application can possibly confuse the gist of the present application, the detailed description will be omitted. Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like or similar constituent elements.

[0099] Although the first, second, and the like are used to describe a plurality of constituent elements, the constituent elements are not limited to these terms. The terms are used only to distinguish one constituent element from the other, and the first constituent element can also be the second constituent element, unless specifically noted otherwise.

[0100] Throughout the specification, each constituent element can be singular or plural, unless specifically noted otherwise.

[0101] ​​Hereinafter, when described as "on the upper or lower side of a constituent element" or "above or below a constituent element", in addition to the case where the arbitrary constituent element is disposed in contact with the upper or lower side of the above-described constituent element, it can also mean that the above-described constituent element is sandwiched by other constituents between the arbitrary constituent disposed above or below the above-described constituent element.

[0102] Also, when described that one constituent element is "connected", "combined" or "in contact" with other constituent element, the above-described constituent elements can be directly connected or in contact, but it should also be understood that the constituent elements can be "sandwiched" by other constituent elements or "connected", "combined" or "in contact" through other constituent elements.

[0103] In the context where no clear different meaning is indicated, the singular expression used in the present specification includes the plural. In the present application, the term "comprise" or "include" and the like should not be interpreted as necessarily including all of the constituent elements or steps described in the specification, but should be interpreted as possibly excluding some of the constituent elements or steps, or further including other constituent elements or steps.

[0104] Throughout the specification, when described as "A and / or B", in the absence of a specific description to the contrary, it means A, B or A and B, and when described as "C to D", in the absence of a specific description to the contrary, it means C or more and D or less.

[0105] For ease of explanation, in the present specification, the direction along the length direction of the winding axis of the electrode assembly wound in the form of a jelly-roll will be referred to as the axial direction Y. In addition, the direction surrounding the above-described winding axis will be referred to as the circumferential direction or the girth direction X. In addition, the direction approaching the above-described winding axis or the direction away from the winding axis will be referred to as the radial direction or the radial direction Z. Among them, in particular, the direction approaching the winding axis will be referred to as the centripetal direction, and the direction away from the winding axis will be referred to as the centrifugal direction.

[0106] Hereinafter, preferred embodiments of the present application will be described with reference to the accompanying drawings.

[0107] Referring to Figure 1 , the cylindrical battery 1 according to an embodiment of the present application includes an electrode assembly 10, a battery case 20, a current collector (first current collector) 30, a case cover 40, and a terminal 50. In addition thereto, the above-described cylindrical battery 1 can further include a sealing gasket G1 and / or an insulating gasket G2 and / or a current collector (second current collector) P and / or an insulator S.

[0108] The above-described electrode assembly 10 is provided with a first electrode tab 11 and a second electrode tab 12.

[0109] More specifically, the electrode assembly 10 described above can be manufactured by winding a laminate formed by sequentially stacking at least once a first electrode, a first separator film, a second electrode, and a second separator film in a circumferential direction (X direction) centered on the Y axis. That is, the electrode assembly 10 applied to the present application can be a jelly-roll type electrode assembly. In this case, in order to achieve insulation from the battery case 20, a first separator film and / or a second separator film or an additional separator film or an insulating film is provided on the outer circumferential surface of the electrode assembly 10 described above.

[0110] The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab. Figure 1 The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab. Figure 1 The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab. The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab.

[0111] The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab. Figure 1 The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab. The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab.

[0112] The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab. The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab.

[0113] The first electrode described above includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. One side end portion of the first electrode current collector in the width direction (the direction parallel to the height direction of the cylindrical battery 1 shown) has an uncoated portion on which the first electrode active material is not coated. The uncoated portion extends to the outside of the first separator film and the second separator film and is exposed, and functions as a first electrode tab 11. The first electrode tab 11 is provided at the upper portion of the electrode assembly 10 housed in the battery case 20 in the height direction (the direction parallel to the height direction of the cylindrical battery 1 shown). The first electrode tab 11 can be, for example, a negative electrode tab. x M y ]O 2+zLiMx(PO4)y(Oz) (A includes at least one or more elements selected from Li, Na, and K; M includes at least one or more elements selected from Ni, Co, Mn, Ca, Mg, Al, Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; 0

[0114] In another example, the positive electrode active material can be an alkali metal compound xLiM 1 O2-(1-x)Li2M 2 O3(M 1 including at least one or more elements having an average oxidation state of 3; M 2 including at least one or more elements having an average oxidation state of 4; 0

[0115] In still another example, the positive electrode active material can be a lithium metal phosphate represented by the general chemical formula LiaM 1 x Fe 1-x M 2 yP 1-y M 3 zO 4-z (M 1 including at least one or more elements selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, and Al; M 2 including at least one or more elements selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, As, Sb, Si, Ge, V, and S; M 3 including a halogen element optionally including F; 0 1 , M 2 and M 3 including at least one element selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg, and Al] or a lithium metal phosphate represented by Li3M2(PO4)3 [M includes at least one element selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg, and Al].

[0116] Preferably, the positive electrode active material can include primary particles and / or secondary particles of agglomeration of the primary particles.

[0117] In one example, the negative electrode active material can use a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, or the like. A metal oxide such as TiO2, SnO2, or the like having a potential of less than 2 V can also be used as the negative electrode active material. As the carbon material, a low-crystalline carbon, a high-crystalline carbon, or the like can be used.

[0118] The separation membrane can use a porous polymer film, and for example, a porous polymer film made of an ethylene monomer polymer, a propylene monomer polymer, an ethylene / butylene copolymer, an ethylene / hexene copolymer, an ethylene / methacrylate copolymer, or the like can be used alone or can be used in layers. As another example, the separation membrane can use a general porous nonwoven fabric, such as a nonwoven fabric composed of a high-melting-point glass fiber, a polyethylene terephthalate fiber, or the like.

[0119] At least one side surface of the separation membrane can include a coating layer of inorganic particles. Also, the separation membrane itself can be composed of a coating layer of inorganic particles. The particles constituting the coating layer can have a structure combined with a binder so that interstitial volumes exist between adjacent particles.

[0120] The inorganic particles can be composed of an inorganic substance having a dielectric constant of 5 or more. As non-limiting examples, the inorganic particles can include at least one or more selected from the group consisting of Pb(Zr, Ti)O3(PZT), Pb(Mg3Nb 1-x La x Zr 1-y Ti y O3(PLZT), PB(Mg3Nb 2 / 3 )O3-PbTiO3(PMN-PT), BaTiO3, hafnia (HfO2), SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO, and Y2O3.

[0121] The cylindrical battery 1 can include an electrolyte. The electrolyte can be a salt having a structure of A + B - , wherein A + includes a basic metal cation such as Li + , Na + , K + , or the like or an ion composed of a combination thereof. In addition, B - includes an anion selected from the group consisting of F - , Cl - , Br - , I - , NO3 - , N(CN)2 - , BF4- , ClO4 - , AlO4 - , AlCl4 - , PF6 - , SbF6 - , AsF6 - , BF2C2O4 - , BC4O8 - , (CF3)2PF4 - , (CF3)3PF3 - , (CF3)4PF2 - , (CF3)5PF - , (CF3)6P - , CF3SO3 - , C4F9SO3, CF3CF2SO3 - , (CF3SO2)2N - , (FSO2)2N - , CF3CF2(CF3)2CO - , (CF3SO2)2CH - , (SF5)3C - , (CF3SO2)3C - , CF3(CF2)7SO3 - , CF3CO2 - , CH3CO2, SCN - , and (CF3CF2SO2)2N - anions selected from the group consisting of any one or more of the above.

[0122] The electrolyte can also be dissolved in an organic solvent. As the organic solvent, propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl 2 pyrrolidone (NMP), ethyl methyl carbonate (EMC), γ butyrolactone, or a mixture thereof can be used.

[0123] The battery case 20 described above is a substantially cylindrical housing having an open portion on one side, and is a metal material having electrical conductivity. In one example, the battery case 51 can be composed of a steel material or an aluminum material, but the present application is not limited thereto. The side surface of the battery case 20 and the lower surface (lower side surface with reference to the lower surface) on the opposite side of the open portion are integrally formed. That is, the battery case 20 has a shape in which the upper end is open and the lower end is closed in the height direction thereof. The side wall and the bottom of the battery case 51 can be integrally formed by press drawing of a sheet metal. Figure 1 The lower surface of the battery case 20 can have a substantially flat shape. The battery case 20 receives the electrode assembly 10 through the open portion formed on one side in the height direction thereof. The battery case 20 can receive the electrolyte together through the open portion.

[0124] The battery case 20 described above can have a crimp portion 21 formed on the upper end portion thereof.

[0125] The battery case 20 described above can have a crimp portion 21 formed on the upper end portion thereof.

[0126] The battery case 20 described above can further have a crimp portion 22 formed on the upper portion than the crimp portion 21. The crimp portion 21 has a shape in which the outer peripheral surface of the battery case 20 is pressed toward the center direction to a predetermined depth. The crimp portion 21 is formed on the upper portion of the electrode assembly 10. The inner diameter of the battery case 20 in the region where the crimp portion 21 is formed is formed to be smaller than the diameter of the electrode assembly 10.

[0127] The crimp portion 21 provides a support surface on which the case cover 40 can be placed. Also, the crimp portion 21 can provide a support surface on which at least a portion of the edge periphery of the current collector 30 described later can be placed and combined. That is, the upper surface of the crimp portion 21 can place at least a portion of the edge periphery of the current collector 30 of the present application and / or the edge periphery of the case cover 40 of the present application. As shown, in order to stably support at least a portion of the edge periphery of the current collector 30 and / or the edge periphery of the case cover 40, the upper surface of the crimp portion 21 can have a shape extending in a direction substantially parallel to the lower surface of the battery case 20, that is, in a direction substantially perpendicular to the side wall of the battery case 20. Figure 1

[0128] The crimp portion 22 is formed on the upper portion of the crimp portion 21. The crimp portion 22 has a shape extending and bending in a manner of wrapping the edge periphery of the case cover 40 disposed on the upper portion of the crimp portion 21. Due to the shape of the crimp portion 22, the case cover 40 is fixed to the crimp portion 21. Of course, it can also be that the crimp portion 22 is omitted, and the case cover 40 is covered and fixed to the open portion of the battery case 20 by other structures.

[0129] ​Second, referring to Figure 2 and Figure 3 , the current collector (first current collector) 30 according to an embodiment of the present application will be described in detail.

[0130] First, referring to Figure 2 , the current collector 30 according to an embodiment of the present application is housed inside the battery case 20, electrically connected to the electrode assembly 10, and electrically connected to the battery case 20. That is, the current collector 30 described above achieves electrical connection between the electrode assembly 10 and the battery case 20.

[0131] Preferably, at least a portion of the current collector 30 is in face-to-face contact with the first electrode tab 11 of the electrode assembly 10, and at least another portion of the current collector 30 is in face-to-face contact with the inner circumferential surface of the battery case 20.

[0132] The current collector 30 described above includes a ring-shaped portion 31, at least one tab coupling portion 32 extending from the ring-shaped portion 31 to be coupled to the first electrode tab 11, and at least one first case coupling portion 33 extending from an end of the tab coupling portion 32 to be coupled to the inner circumferential surface of the battery case 20.

[0133] The number of the tab coupling portion 32 and the first case coupling portion 33 can be one or more than two, and preferably, three to six can be disposed at equal intervals in the circumferential direction.

[0134] The ring-shaped portion 31 and the at least one tab coupling portion 32 are disposed at the upper portion of the electrode assembly 10, and in the case where the crimped portion 21 is formed in the battery case 20, can be located at the lower portion of the crimped portion 21.

[0135] The ring-shaped portion 31 can be provided at the center of the current collector 30. Therefore, the ring-shaped portion 31 can also be referred to as a center portion.

[0136] The ring-shaped portion 31 has a current collector hole H2 formed at a position corresponding to a winding hole H1 formed at the center portion of the electrode assembly 10. The winding hole H1 and the current collector hole H2, which are in communication with each other, can function as a channel for inserting a soldering rod or irradiating laser for soldering between the terminal 50 and the current collector (second current collector) P, or between the terminal 50 and the lead tab (not shown), which will be described later.

[0137] The ring-shaped portion 31 can have a substantially circular plate shape. For example, referring to Figure 2 , the ring-shaped portion 31 can have a ring-shaped plate shape having the current collector hole H2 provided at the center thereof.

[0138] The at least one tab bonding portion 32 can have a shape extending substantially radially from the annular portion 31 of the current collector 30 toward the inner side wall of the battery case 20. The tab bonding portion 32 can be provided, for example, in a plurality. For example, referring to Figure 2 The plurality of tab bonding portions 32 can be provided separately from each other along the edge of the annular portion 31. In this way, the cylindrical battery 1 of the present application is provided with the plurality of tab bonding portions 32, thereby enabling the bonding area with the first electrode tab 11 to be increased. Thus, the bonding force between the first electrode tab 11 and the tab bonding portion 32 is ensured, and the electrical resistance can be reduced.

[0139] The lengthwise end portion of the tab bonding portion 32 can be located more inward than the innermost portion of the crimped portion 21 formed in the battery case 20. More specifically, the boundary region of the tab bonding portion 32 and the first case bonding portion 33 can be located more inward in the direction toward the winding hole H1 than the innermost portion of the crimped portion 21 formed in the battery case 20. According to such a structure, the damage to the bonding portion between the components that can occur when the current collector 30 is excessively bent in order to have the end portion of the first case bonding portion 33 located on the crimped portion 21 can be prevented.

[0140] On the other hand, in order to ensure the bonding force and reduce the electrical resistance by increasing the bonding area between the current collector 30 and the electrode assembly 10, the annular portion 31 can be bonded to the first electrode tab 11 in addition to the tab bonding portion 32. The end portion of the first electrode tab 11 can be shaped to be bent in parallel with the tab bonding portion 32. In the case where the end portion of the first electrode tab 11 is shaped to be bent in parallel with the tab bonding portion 32 and bonded to the tab bonding portion 32 in this state, the bonding area is increased, thereby enabling the effects of improving the bonding force and reducing the electrical resistance to be obtained, and the total height of the electrode assembly 10 is minimized, thereby enabling the effect of improving the energy density to be obtained.

[0141] The at least one first case bonding portion 33 can extend from the end portion of the tab bonding portion 32 and be bonded to the inner circumferential surface of the battery case 20. For example, the at least one first case bonding portion 33 can have a shape extending from the end portion of the tab bonding portion 32 toward the inner side wall of the battery case 20. The first case bonding portion 33 can be provided, for example, in a plurality. For example, referring to Figure 2 The plurality of first case bonding portions 33 can be provided separately from each other along the edge of the annular portion 31. Referring to Figure 1 The plurality of first case bonding portions 33 can be bonded to the crimped portion 21 in the inner circumferential surface of the battery case 20. As Figure 1As shown, the upper surface of the crimped portion 21 is formed so as to have a shape extending in a direction substantially parallel to the lower surface of the battery case 20, i.e., a direction substantially perpendicular to the side wall of the battery case 20, and the first case joining portion 33 also has a shape extending in the same direction, so that the first case joining portion 33 can stably contact the crimped portion 21. Also, as the first case joining portion 33 stably contacts the crimped portion 21 in this way, welding between the two components can be smoothly performed, so that the effects of improving the joining force between the two components and minimizing the increase in electrical resistance at the joining site can be obtained. Also, by the structure in which the current collector 30 is joined to the crimped portion 21 of the battery case 20 instead of being joined to the cylindrical inner peripheral surface of the battery case 20, the distance between the current collector 30 and the crimped portion 21 can be reduced. Therefore, the dead angle inside the battery case 20 is minimized, so that the energy density of the cylindrical battery 1 can be improved.

[0142] Reference Signs List Figure 2 The first case joining portion 33 includes a contact portion 33a joined to the inner peripheral surface of the battery case 20 and a connecting portion 33b connecting between the tab joining portion 32 and the contact portion 33a.

[0143] The contact portion 33a is joined to the inner peripheral surface of the battery case 20. In the case where the crimped portion 21 is formed in the battery case 20, as described above, the contact portion 33a can be joined to the crimped portion 21. In this case, as described above, in order to achieve stable contact and joining, the crimped portion 21 and the contact portion 33a can each have a shape extending in a direction substantially parallel to the lower surface of the battery case 20, i.e., a direction substantially perpendicular to the side wall of the battery case 20.

[0144] Reference Signs List Figure 2 The connecting portion 33b can have at least one bent portion B whose extending direction is changed between the ring-shaped portion 31 and the contact portion 33a. That is, the connecting portion 33b can have a structure such as a spring-like structure or a stretchable structure that can be stretched within a certain range. According to this structure of the connecting portion 33b, even if there is a height dispersion of the electrode assembly 10 within a certain range, the contact portion 33a can be made to closely adhere to the crimped portion 21 during the process of housing the electrode assembly 10 to which the current collector 30 is joined in the battery case 20.

[0145] In the drawings of the present application, only the case where one bent portion B is provided is shown, but the present application is not limited thereto, and of course, a plurality of bent portions B can be provided.

[0146] For example, it is preferable that the vertical distance D between the contact portion 33a and the ring-shaped portion 31 in a state where no external force is applied to the current collector 30 and no deformation occurs (see FIG. 4) be equal to or less than 0.5 mm. Figures 8 to 10The vertical distance between the upper surface of the rolled edge 21 and the annular portion 31 is the same as, or smaller within the elongation range of the connecting portion 33b, when the electrode assembly 10 with the current collector 30 is placed inside the battery housing 20. When the connecting portion 33b is configured to meet this condition, when the electrode assembly 10 with the current collector 30 is placed inside the battery housing 20, the contact portion 33a can naturally adhere tightly to the rolled edge 21 by the weight of the electrode assembly 10.

[0147] In addition, due to the retractable structure of this connecting part 33b, in the cylindrical battery 1 (refer to...) Figure 1 Even if vibration and / or impact occur during use and the electrode assembly 10 moves up and down, within a certain range, the impact caused by the movement of the electrode assembly 10 can still be mitigated.

[0148] On the other hand, when the connecting portion 33b has only one bent portion B, unlike the case shown in the attached drawings, the bent portion B can also protrude in the centripetal direction toward the winding center of the electrode assembly 10 (see figure). Figure 13 The bending direction of the connecting portion 33b is to prevent damage to the joint between the current collector (first current collector) 30 and the electrode assembly 10, and / or the joint between the current collector (first current collector) 30 and the battery casing 20, during the sizing process. The sizing process is a compression process that reduces the height occupied by the rolled edge portion 21 area of ​​the battery casing 20 in order to reduce the overall height of the cylindrical battery 1 during manufacturing. After checking the degree of damage to the welded portion after the sizing process by changing whether the aforementioned bent portion B was formed and the protruding direction of the bent portion B, it was found that almost no damage occurred in the cylindrical battery 1 with a structure having a bent connecting portion 33b so that the bent portion B protrudes in the centripetal direction of the electrode assembly 10.

[0149] Secondly, refer to Figure 3 The image shows a current collector 30 according to another embodiment of the present invention. (The last sentence appears to be incomplete and possibly refers to something similar to the description above.) Figure 2 Compared to the current collector 30 described above, the current collector 30 according to another embodiment of the present invention differs only in the shape of the contact portion 33a. Otherwise, it can adopt a structure that is substantially the same as the current collector 30 described above.

[0150] Reference Figure 3The contact portion 33a can have a shape in which at least a portion thereof extends along the inner circumferential surface of the battery case 20. For example, the contact portion 33a can have an arc shape that extends in the circumferential direction along the crimped portion of the battery case 20. Also, although not shown in the drawings, in order to maximize the contact area, the current collector 30 can also be configured such that the sum of the extension lengths of the contact portions 33a of the at least one first case coupling portion 33, measured along the outermost edges, is substantially the same as the circumferential length of the battery case 20. As a result, the effects of an increase in coupling force and a reduction in resistance that result from the maximization of the coupling area can be obtained.

[0151] Next, referring to Figure 4 and Figure 5 , a current collector 30 according to still another embodiment of the present application is shown. The current collector 30 according to still another embodiment of the present application differs from the current collector 30 shown in Figure 3 only in the shape of the connection portion 33b, and can otherwise employ substantially the same structure as the current collector 30 described above.

[0152] Referring to Figure 4 and Figure 5 , the connection portion 33b can have a shape in which at least a portion thereof extends in the circumferential direction along the inner circumferential surface of the battery case 20. For example, the contact portion 33a can have an arc shape that extends in the circumferential direction along the inner circumferential surface of the crimped portion of the battery case 20, and the connection portion 33b can also have an arc shape that extends in the circumferential direction in a state of being connected to the contact portion 33a. According to such a structure, the area of the current collector 30 is further increased compared to the current collector 30 shown in Figure 3 , so the effect of reducing resistance can be maximized. On the other hand, referring to Figure 5 , unlike the current collector 30 shown in Figures 1 to 3 , the current collector 30 can not have a bent portion B. In the case where the bent portion B is not provided, the amount of raw material required to manufacture the current collector 30 can be reduced. As a result, the manufacturing cost of the current collector 30 can be reduced.

[0153] Next, referring to Figures 6 to 15 , a current collector 30 according to another embodiment of the present application is described.

[0154] The current collector 30 includes a plurality of tab coupling portions 32 extending from the annular portion 31 and coupled to the first electrode tab 11, and a plurality of first case coupling portions 33 extending from the annular portion 31 and coupled to the inner circumferential surface of the battery case 20. The tab coupling portions 32 and the first case coupling portions 33 are indirectly connected through the annular portion 31 and are not directly connected to each other. Accordingly, when an external impact is applied to the cylindrical battery 1 of the present application, the possibility of damage to the coupling portions of the current collector 30 and the electrode assembly 10 and the coupling portions of the current collector 30 and the battery case 20 can be minimized.

[0155] The annular portion 31 and the plurality of tab coupling portions 32 are disposed at the upper portion of the electrode assembly 10, and are located at the lower portion of the crimped portion 21 when the crimped portion 21 is formed in the battery case 20.

[0156] The annular portion 31 has a current collector hole H2 formed at a position corresponding to a winding hole H1 formed at the center portion of the electrode assembly 10. The winding hole H1 and the current collector hole H2, which are in communication with each other, can function as a welding rod for achieving welding between the terminal 50 and the current collector (second current collector) P or between the terminal 50 and a lead tab (not shown) to be described later or a passage for irradiating laser light.

[0157] The plurality of tab coupling portions 32 can have a shape extending in a substantially radial direction from the annular portion 31 of the current collector 30 toward the side wall of the battery case 20. The plurality of tab coupling portions 32 can each be disposed apart from each other along the edge of the annular portion 31. Alternatively, in order to secure a coupling force and reduce resistance by increasing the coupling area between the current collector 30 and the electrode assembly 10, the annular portion 31 can be coupled to the first electrode tab 11 in addition to the tab coupling portions 32. The end portion of the first electrode tab 11 can be shaped to be bent in parallel with the tab coupling portions 32. In the case where the end portion of the first electrode tab 11 is shaped to be bent in parallel with the tab coupling portions 32 and is coupled to the tab coupling portions 32 in this state, the coupling area is increased, so that an effect of improving the coupling force and reducing the resistance can be obtained, and the total height of the electrode assembly 10 is minimized, so that an effect of improving the energy density can be obtained.

[0158] The plurality of first case coupling portions 33 can have a shape extending from the annular portion 31 of the current collector 30 toward the inner side of the battery case 20 more than substantially in a radial direction. The plurality of first case coupling portions 33 can each be disposed apart from each other along the edge of the annular portion 31. At least one first case coupling portion 33 can be provided between the tab coupling portions 32 adjacent to each other. The plurality of first case coupling portions 33 can be coupled to, for example, the crimped portion 21 in the inner circumferential surface of the battery case 20. In particular, the plurality of first case coupling portions 33 can be coupled to the upper surface of the crimped portion 21. In the cylindrical battery 1 of the present application, in the case where such a structure is applied, the first case coupling portions 33 are naturally placed on the crimped portion 21 by a process of housing the electrode assembly 10 in a state of being coupled to the current collector 30 in the battery case 20. Therefore, the welding process of the battery case 20 and the current collector 30 can be smoothly performed. Also, by configuring the upper surface of the crimped portion 21 to have a shape extending in a direction substantially parallel to the lower surface of the battery case 20, that is, in a direction substantially perpendicular to the side wall of the battery case 20, the first case coupling portions 33 also have a shape extending in the same direction, so that the first case coupling portions 33 can stably contact on the crimped portion 21. Also, as the first case coupling portions 33 stably contact on the crimped portion 21 in this way, the welding between the two components can be smoothly performed, so that an effect of improving the coupling force between the two components and minimizing the increase in resistance at the coupling site can be obtained.

[0159] Second, the first case coupling portion 33 includes a first contact portion 33a coupled to the inner circumferential surface of the battery case 20 and a first connecting portion 33b connecting between the annular portion 31 and the first contact portion 33a.

[0160] The first contact portion 33a is coupled to the inner circumferential surface of the battery case 20. In the case where the battery case 20 is formed with the crimped portion 21, as described above, the first contact portion 33a can be coupled to the crimped portion 21. In this case, as described above, in order to stably contact and couple, the crimped portion 21 and the first contact portion 33a can each have a shape extending in a direction substantially parallel to the lower surface of the battery case 20, that is, in a direction substantially perpendicular to the side wall of the battery case 20.

[0161] Reference Figures 8 to 10The first connecting portion 33b can have at least one first bending portion B1 which changes the extending direction between the ring-shaped portion 31 and the first contact portion 33a. That is, the first connecting portion 33b can have a structure which can be stretched and contracted within a certain range, such as a spring-like structure or a stretchable structure. According to this structure of the first connecting portion 33b, even if there is a height variation of the electrode assembly 10 within a certain range, the first contact portion 33a can naturally adhere to the curled portion 21 by the weight of the electrode assembly 10 during the process of housing the electrode assembly 10 to which the current collector 30 is attached in the battery case 20.

[0162] For example, it is preferable that the vertical distance D between the first contact portion 33a and the ring-shaped portion 31 in the state where no external force is applied to the current collector 30 and the current collector 30 is not deformed be the same as or smaller than the vertical distance between the upper surface of the curled portion 21 and the ring-shaped portion 31 when the electrode assembly 10 to which the current collector 30 is attached is placed in the battery case 20 within the range in which the first connecting portion 33b can be stretched. In the case where the first connecting portion 33b is configured to satisfy this condition, the first contact portion 33a can naturally adhere to the curled portion 21 by the weight of the electrode assembly 10 when the electrode assembly 10 to which the current collector 30 is attached is placed in the battery case 20.

[0163] In addition, due to the stretchable structure of the first connecting portion 33b, even if the electrode assembly 10 moves up and down during the use of the cylindrical battery 1 (see Figure 1 ), the impact caused by the movement of the electrode assembly 10 is alleviated within a certain range. That is, the stretchable structure of the first connecting portion 33b can function as a buffer to prevent the impact from being transmitted to the attachment site between the first contact portion 33a and the battery case 20 and the attachment site between the tab attachment portion 32 and the first electrode tab 11.

[0164] Next, a current collector 30 according to another embodiment of the present application is shown with reference to Figure 11 . The current collector 30 according to another embodiment of the present application is different from the current collector 30 described above (see Figure 7 ) only in the shape of the first contact portion 33a, and can have substantially the same structure as the current collector 30 described above except for this.

[0165] The first contact portion 33a can have a shape in which at least a portion thereof extends in the direction of a circular arc along the inner circumferential surface of the battery case 20. In this case, in order to maximize the contact area, the current collector 30 can be configured such that the sum of the extending lengths measured along the outermost edges of the first contact portion 33a of each of the plurality of first case attachment portions 33 is substantially the same as the inner circumference of the battery case 20.

[0166] Second, referring to Figure 12 , a current collector 30 according to still another embodiment of the present application is shown. Compared with the plurality of current collectors 30 according to the above-described embodiments (exemplarily referring to Figure 7 and Figure 11 described current collectors), the current collector 30 according to still another embodiment of the present application is only different in further having a second housing joint portion 34, and can adopt substantially the same structure as the above-described plurality of current collectors 30 except for this.

[0167] The above-described second housing joint portion 34 is coupled to the inner peripheral surface of the battery housing 20 after extending from the end of the tab joint portion 32. The end of at least one of the plurality of above-described tab joint portions 32 is provided with such a second housing joint portion 34. The above-described second housing joint portion 34 includes a second contact portion 34a coupled to the inner peripheral surface of the battery housing 20 and a second connecting portion 34b connecting between the annular portion 31 and the second contact portion 34a.

[0168] The above-described second contact portion 34a is coupled to the inner peripheral surface of the battery housing 20. In the case where the above-described battery housing 20 is formed with the crimped portion 21, the second contact portion 34a can be coupled to the crimped portion 21 in the same manner as the above-described first contact portion 33a. In this case, as described above, in order to stabilize the contact and coupling, both the crimped portion 21 and the second contact portion 34a can have a shape extending in a direction substantially parallel to the lower surface of the battery housing 20, i.e., a direction substantially perpendicular to the side wall of the battery housing 20.

[0169] On the other hand, although not shown, like Figure 11 the shape of the first contact portion 33a shown, the second contact portion 34a can also have a shape in which at least a portion thereof extends in the direction of the circular arc of the inner peripheral surface of the battery housing 20. In this case, in order to maximize the contact area between the current collector 30 and the battery housing 20, the above-described current collector 30 can be configured such that the sum of the extension lengths measured along the outermost edges of the second contact portions 34a of the plurality of second housing joint portions 34 is substantially the same as the inner periphery of the battery housing 20.

[0170] Referring to Figure 13 and Figure 14 , like the above-described first connecting portion 33b, the above-described second connecting portion 34b can have at least one second bent portion B2 whose extension direction is changed between the tab joint portion 32 and the second contact portion 34a. Due to the formation of the above-described second bent portion B2, the second connecting portion 34b has a stretchable structure, thereby having the advantages in the assembly process of the cylindrical battery 1 and the cushioning effect, which are the same as described above. As shown in Figure 13 , the above-described second bent portion B2 can protrude in the centripetal direction of the electrode assembly 10, or as shown inFigure 14 As shown, it can protrude toward the central axis of the electrode assembly 10.

[0171] The accompanying drawings of this invention show only the case of having one of the above-described second curved portions B2, but the invention is not limited to this. Similar to the first connecting portion 33b described above, multiple second curved portions B2 may also be provided.

[0172] Reference Figure 15 The current collector (first current collector) 30 of the present invention may have at least one injection hole H3. The injection hole H3 may be provided, for example, at the tab connection portion 32. In the case of multiple tab connections 32, the injection hole H3 may be provided at least one tab connection portion 32. The injection hole H3 may be provided, for example, on one side of at least one welding line W formed on the tab connection portion 32, or on both sides.

[0173] When manufacturing a cylindrical battery 1 according to an embodiment of the present invention, an electrolyte can be injected after the assembly including the electrode assembly 10 and the current collector (first current collector) 30 is housed in the battery casing 20. In this case, the injection port H3 described above improves injectability.

[0174] Reference Figure 14 The first connecting portion 33b of the first housing joint 33 and / or the second connecting portion 34b of the second housing joint 34 of the present invention may have a shape that is bent once, and may have a shape that faces towards the housing joint 34. Figure 8 as well as Figure 13 The shapes shown are bent in different directions. That is, the first bent portion B1 formed on the first connecting portion 33b and / or the second bent portion B2 formed on the second connecting portion 34b can have a bend towards the cylindrical battery 1 (see reference). Figure 1 The first connecting portion 33b and / or the second connecting portion 34b are bent in a direction that protrudes towards the central axis of the electrode assembly 10. This bending direction is to prevent damage to the joint between the current collector (first current collector) 30 and the electrode assembly 10, and / or the joint between the current collector (first current collector) 30 and the battery casing 20, during the sizing process. The sizing process is a compression process that reduces the height occupied by the rolled edge portion 21 of the battery casing 20 to reduce the overall height of the cylindrical battery 1 during manufacturing. After checking the degree of damage to the welded portion after the sizing process by changing whether the aforementioned bent portions B1 and B2 are formed and the protruding direction of the bent portions B1 and B2, it was found that almost no damage occurred in the cylindrical battery 1 with a structure where the bent portions B1 and B2 protrude towards the centripetal direction of the electrode assembly 10 or towards the central axis of the electrode assembly 10.

[0175] Below, refer to Figures 16 to 18, it is explained another embodiment of the current collector applicable to the cylindrical battery. The current collector 30 of the another embodiment can achieve the electrical connection between the electrode assembly 10 applied to the cylindrical battery 1 and the battery case 20.

[0176] The above-mentioned current collector 30 includes a ring-shaped portion 31 surrounding the center axis of the above-mentioned electrode assembly 10 so as to be able to define an opening area exposing the above-mentioned first electrode tab 11 of the above-mentioned electrode assembly 10.

[0177] The above-mentioned ring-shaped portion 31 not only includes a portion extending in the circumferential direction, but also can include a portion extending in the radial direction. The above-mentioned ring-shaped portion 31 can include a plurality of first portions 31a extending in the circumferential direction from a first radius position of the exposure area of the above-mentioned first electrode tab 11; a plurality of second portions 31b disposed between the first portions 31a adjacent in the circumferential direction in a second radius position outside the above-mentioned first radius position; and a third portion 31c connecting the first portions 31a adjacent in the circumferential direction and the second portions 31b therebetween to define a space in which the above-mentioned tab junction portion 32 extends. The third portion 31c can extend in the substantially radial direction, but the present application is not limited thereto. The above-mentioned third portion 31c can also extend in a linear shape or in an arc shape different from the drawing or in a shape combined with a linear shape and an arc shape.

[0178] The above-mentioned first portions 31a, the above-mentioned second portions 31b, and the above-mentioned third portion 31c are in face-to-face contact with the above-mentioned first electrode tab 11. Therefore, it is possible to further increase the area in which the first electrode tab 11 of the electrode assembly 10 and the current collector 30 are in contact with each other.

[0179] The above-mentioned ring-shaped portion 31 can have a closed loop shape surrounding the center axis of the electrode assembly 10 or the current collector hole H2 provided at a position corresponding thereto. As Figure 17 illustrated, such a closed loop shape can be a closed loop in which the first portions 31a, the second portions 31b, and the third portion 31c are completely connected.

[0180] Alternatively, the above-mentioned ring-shaped portion 31 can be a shape substantially having a ring shape. That is, as Figure 18 illustrated, a specific position of the first portion 31a can be formed with a cut portion 31d. In this case, the above-mentioned ring-shaped portion 31 is, to be exact, an open closed shape, but has a shape in which the entire portion can be recognized as a closed loop shape. A person skilled in the art can understand that the cut portion 31d can be formed not only in the first portion 31a, but also in the second portion 31b and / or the third portion 31c.

[0181] The current collector 30 includes a tab coupling portion 32 coupled to the annular portion 31. The tab coupling portion 32 can extend from the second portion 31b toward the radial direction of the electrode assembly 10. The tab coupling portion 32 can extend in a straight line shape or in an arc shape different from the drawing or a shape combining the straight line shape and the arc shape.

[0182] The tab coupling portion 32 can be disposed in substantially the same plane as the annular portion 31. A gap g can be provided between the tab coupling portion 32 and the third portion 31c. The gap g can extend in a straight line shape or in an arc shape different from the drawing or a shape combining the straight line shape and the arc shape.

[0183] Unlike the tab coupling portion 32 of the other embodiments described above, the tab coupling portion 32 of the embodiment extends from the second portion 31b of the annular portion 31 toward the radial direction. That is, the tab coupling portion 32 can be disposed inside an opening region defined by the annular portion 31. The opening region can extend radially from the center of the electrode assembly 10, and the tab coupling portion 32 can also extend radially within the opening region.

[0184] The distance from the inside of the annular portion 31 to the edge of the winding hole H1 of the electrode assembly 10 can be greater than or the same as the length of the tab coupling portion 32.

[0185] The tab coupling portion 32 and the first electrode tab 11 of the electrode assembly 10 can be coupled by welding or the like.

[0186] Alternatively, the first portion 31a and / or the second portion 31b and / or the third portion 31c of the annular portion 31 and the first electrode tab 11 can be coupled by welding or the like.

[0187] In this way, all or selectively of the portions of the annular portion 31 can be welded to the first electrode tab 11.

[0188] Second, the current collector 30 includes a first case coupling portion 33 coupled to the first portion 31a of the annular portion 31.

[0189] The first case coupling portion 33 can extend from the first portion 31a of the annular portion 31 to the outside in the radial direction.

[0190] The radially outer end of the first case coupling portion 33 can be coupled to the inner circumferential surface of the battery case 20.

[0191] The portion of the first case coupling portion 33 coupled to the annular portion 31 can be disposed more radially inward than the portion of the tab coupling portion 32 coupled to the annular portion 31.

[0192] The aforementioned tab connection portion 32 and the first housing connection portion 33 can be connected via the aforementioned annular portion 31. That is, the aforementioned tab connection portion 32 is connected to the second portion 31b, and the aforementioned first housing connection portion 33 is connected to the first portion 31a. The aforementioned tab connection portion 32 and the first housing connection portion 33 are connected at positions different from those of the aforementioned annular portion 31 in the circumferential direction, and are also connected at positions different from those of the aforementioned annular portion 31 in the radial direction.

[0193] Therefore, when the cylindrical battery is subjected to vibration or impact, the vibration or impact transmitted through the first housing joint 33 can be absorbed or buffered by the geometry of the annular portion 31. Specifically, there is a gap between the third portion 31c of the annular portion 31 and the tab joint 32, so externally applied vibration or impact is transmitted to the tab joint 32 through the third portion 31c. In this case, by increasing the path for transmitting vibration or impact, the vibration or impact can be buffered.

[0194] The first housing joint 33 may include a first contact portion 33a that contacts the inner circumferential surface of the battery housing 20 and a first connecting portion 33b that connects the first contact portion 33a and the annular portion 31. The first connecting portion 33b is disposed further in the radial direction than the first contact portion 33a, and is disposed further out in the radial direction than the first portion 31a of the annular portion 31.

[0195] That is, the outer end of the first connecting portion 33b in the radial direction can be connected to the first contact portion 33a, and the inner end of the first connecting portion 33b in the radial direction can be connected to the first part 31a of the annular portion 31.

[0196] The first contact portion 33a is located at the outer radial end of the first housing joint portion 33 and can extend in the circumferential direction. The first contact portion 33a can extend bidirectionally in the circumferential direction from the outer radial end of the first connecting portion 33b.

[0197] The first contact portion 33a may be formed in an arc shape. Preferably, the first contact portion 33a may have a shape corresponding to the inner peripheral surface of the battery casing 20 that contacts the first contact portion 33a and / or the rolled edge portion 21.

[0198] The curvature of the outermost edge of the arc-shaped first contact portion 33a can correspond to the curvature of the inner circumferential surface of the battery casing 20.

[0199] The first connecting portion 33b can extend in the radial direction of the electrode assembly 10 and in the axial direction. The first connecting portion 33b can extend in a direction away from the electrode assembly 10 in the axial direction as it extends toward the outside in the radial direction.

[0200] The first connecting portion 33b can extend straight.

[0201] The first connecting portion can have one or more than two first curved portions as described above, but in the embodiment, these curved portions are omitted and a simple first connecting portion 33b is exemplarily shown.

[0202] On the other hand, referring to Figure 1 and Figure 6 The housing cover 40 covers the open portion formed on one side of the battery case 20. The housing cover 40 can be fixed by the crimping portion 22 formed on the upper end of the battery case 20. In this case, in order to improve the fixing force and to improve the sealing property of the battery case 20, a gasket G1 can be interposed between the battery case 20 and the housing cover 40. The housing cover 40 can not be a component that needs to perform a current passage function. Therefore, it is not necessarily required to use the gasket G1 as long as the fixing can be achieved by welding or using other components to firmly fix the battery case 20 and the housing cover 40 and to secure the sealing property of the open portion of the battery case 20.

[0203] On the other hand, according to the embodiment in which the gasket G1 is used, the gasket G1 can have a substantially ring shape that wraps the edge of the housing cover 40. The gasket G1 can cover the upper surface, the lower surface, and the side surface of the housing cover 40 at the same time.

[0204] The radial direction length of the portion of the gasket G1 that covers the lower surface of the housing cover 40 can be smaller than or the same as the radial direction length of the portion of the gasket G1 that covers the upper surface of the housing cover 40. If the radial direction length of the portion of the gasket G1 that covers the lower surface of the housing cover 40 is excessively long, the gasket G1 presses the current collector 30 during the process of compressing the battery case 20 upward and downward, and thus the current collector 30 and / or the battery case 20 can be deformed. Therefore, if the radial direction length of the portion of the gasket G1 that covers the lower surface of the housing cover 40 is set to a certain level that is small, the deformation of the current collector 30 and / or the battery case 20 can be prevented. Specifically, as shown in Figure 1 and Figure 6 The radial direction length of the portion of the gasket G1 that covers the lower surface of the housing cover 40 can be formed to be smaller than the radial direction length of the portion of the gasket G1 that covers the upper surface of the housing cover 40.

[0205] On the other hand, the contact portion 33a can be fixed by being sandwiched between the crimped portion 21 of the battery case 20 and the gasket G1. That is, in a state where the contact portion 33a is sandwiched between the crimped portion 21 of the battery case 20 and the gasket G1, the contact portion 33a can be fixed by the pressure bonding force of the pressure bonding portion 22.

[0206] Alternatively, a welding portion can be formed between the crimped portion 21 of the battery case 20 and the contact portion 33a of the current collector 30. For example, it is sometimes difficult to accurately fix the contact portion 33a by pressure bonding force alone. Alternatively, when the gasket G1 is thermally shrunk or the pressure bonding portion 22 is deformed by an external impact, the bonding force between the contact portion 33a of the current collector 10 and the battery case 20 can decrease. Therefore, the contact portion 33a can be fixed to the battery case 20 by welding in a state where the contact portion 33a is placed on the crimped portion 21 of the battery case 20. Thereafter, the case cover 40 wrapped by the gasket G1 is placed on the upper end of the contact portion 33a to form the pressure bonding portion 22, and thus the cylindrical battery 1 can be completed. At this time, the welding method can employ, for example, laser welding, resistance welding, ultrasonic welding, etc., but the welding method is not limited to these.

[0207] The case cover 40 can have a vent portion 41 formed to prevent an increase in internal pressure due to gas generated inside the battery case 20. The vent portion 41 is formed in a portion of the case cover 40, and corresponds to a region that is structurally weaker than the surrounding region so as to be easily broken when internal pressure is applied. The vent portion 41 can be, for example, a region having a thickness thinner than the surrounding region.

[0208] The height of the case cover 40 can be lower than the height of the pressure bonding portion 22. In this case, the cylindrical battery 1 can be rotated by 180 degrees, and thus the cylindrical battery 1 can be mounted on a predetermined tray. Since there is a difference in height between the case cover 40 and the pressure bonding portion 22, only the pressure bonding portion 22 contacts the surface of the tray, and the case cover 40 is spaced apart from the surface of the tray. The space can provide a gas discharge space when gas is discharged from the inside of the battery case 20.

[0209] The terminal 50 penetrates the battery case 20 at a position opposite the open portion of the battery case 20 and is electrically connected to the second electrode tab 12 of the electrode assembly 10. The terminal 50 can penetrate substantially the center of the lower surface of the battery case 20. The terminal 50 can be connected to, for example, a current collector (second current collector) P connected to the second electrode tab 12 or a lead tab (not shown) connected to the second electrode tab 12, thereby being electrically connected to the electrode assembly 10. Thus, the terminal 50 has the same polarity as the second electrode of the electrode assembly 10 and can function as a second electrode terminal T2. In the case where the second electrode tab 12 is a positive electrode tab, the terminal 50 can function as a positive electrode terminal. In view of the polarity and function of the terminal 50, the terminal 50 needs to be in an insulating state with the battery case 20 having the opposite polarity. To this end, an insulating gasket G2 can be provided between the terminal 50 and the battery case 20. Alternatively, an insulating material can be applied to a portion of the surface of the terminal 50 to achieve insulation.

[0210] For the same reason, the second electrode tab 12 and / or the current collector (second current collector) P needs to be in an insulating state with the battery case 20. To this end, an insulator S can be interposed between the second electrode tab 12 and the battery case 20 and / or between the current collector (second current collector) P and the battery case 20. In the case where the insulator S is used, the terminal 50 can penetrate the insulator S in order to achieve electrical connection with the second electrode tab 12.

[0211] On the other hand, in the present application, the entire surface of the battery case 20 can function as a first electrode terminal Tl. For example, in the case where the first electrode tab 11 is a negative electrode tab, the first electrode terminal Tl can be a negative electrode terminal. The cylindrical battery 1 according to the present application has a structure in which the terminal 50 exposed at the lower surface of the battery case 20 at a position opposite the open portion of the battery case 20 and the remaining area of the lower surface of the battery case 20 except for the area occupied by the terminal 50 can be used as a second electrode terminal T2 and a first electrode terminal Tl, respectively. Thus, the cylindrical battery 1 according to the present application can connect all positive / negative electrodes in one direction when a plurality of cylindrical batteries 1 are electrically connected, thereby simplifying the electrical connection structure. Also, the cylindrical battery 1 according to the present application has a structure in which most of the lower surface of the battery case 20 at a position opposite the open portion of the battery case 20 can be used as an electrode terminal, thereby having the advantage of being able to secure a sufficient area for soldering a member for electrical connection.

[0212] In the present application, the sealing gasket G1 and the insulating gasket G2 can be formed of a high-molecular resin having insulating and elastic properties. In one example, the sealing gasket G1 and the insulating gasket G2 can be formed of polypropylene, polybutylene terephthalate, polyvinyl fluoride, etc., but the present application is not limited thereto.

[0213] Preferably, the cylindrical battery can be a cylindrical battery having a ratio of a shape factor, for example, a value of a diameter of the cylindrical battery divided by a height, that is, a ratio defined as a diameter Φ with respect to a height H, of greater than about 0.4.

[0214] Here, the shape factor indicates a string of numbers showing a diameter and a height of the cylindrical battery. The cylindrical battery according to an embodiment of the present application can be, for example, 46110, 48750, 48110, 48800, 46800, etc. Among the values shown by the shape factor, the first two numbers indicate a diameter of the cylindrical battery, and the remaining numbers indicate a height of the cylindrical battery.

[0215] The battery according to an embodiment of the present application has a substantially cylindrical shape, can be a cylindrical battery having a diameter of about 46 mm, a height of about 110 mm, and a ratio of a shape factor of about 0.418.

[0216] The battery according to another embodiment has a substantially cylindrical shape, can be a cylindrical battery having a diameter of about 48 mm, a height of about 75 mm, and a ratio of a shape factor of about 0.640.

[0217] The battery according to still another embodiment has a substantially cylindrical shape, can be a cylindrical battery having a diameter of about 48 mm, a height of about 110 mm, and a ratio of a shape factor of about 0.418.

[0218] The battery according to still another embodiment has a substantially cylindrical shape, can be a cylindrical battery having a diameter of about 48 mm, a height of about 80 mm, and a ratio of a shape factor of about 0.600.

[0219] The battery according to still another embodiment has a substantially cylindrical shape, can be a cylindrical battery having a diameter of about 46 mm, a height of about 80 mm, and a ratio of a shape factor of about 0.575.

[0220] Previously, a battery having a ratio of a shape factor of about 0.4 or less has been used. That is, for example, a 1865 battery, a 2170 battery, etc. have been used. The 1865 battery has a diameter of about 18 mm, a height of about 65 mm, and a ratio of a shape factor of 0.277. The 2170 battery has a diameter of about 21 mm, a height of about 70 mm, and a ratio of a shape factor of 0.300.

[0221] The cylindrical battery 1 according to the embodiment of the present application has no polarity. However, the first current collector 30 is connected to the inner circumferential surface of the battery case 51, and thus the outer surface of the bottom of the battery case 20 has a polarity opposite to that of the terminal 50. Therefore, when a plurality of cylindrical batteries 1 are connected in series and / or in parallel, the bus bar connection and the like can be routed in the direction of one side of the cylindrical battery 1 using the outer surface of the bottom of the battery case 20 and the terminal 50. Unlike the case shown in the drawing, in the cylindrical battery 1, in a state where the terminal 50 is oriented in the upward direction and the case 20 is oriented in the downward direction, the electrical wiring can be performed using the terminal 50 and the flat surface around the terminal 50. This increases the number of cylindrical batteries that can be loaded in the same space, and thus the energy density can be improved.

[0222] The cylindrical battery 1 according to the above-described embodiment can be used to manufacture a battery pack.

[0223] Figure 19 FIG. 1 is a diagram schematically showing the configuration of a battery pack 3 according to an embodiment of the present application.

[0224] Referring to Figure 19 , the battery pack 3 according to the embodiment of the present application includes an assembly in which a plurality of cylindrical batteries 1 are electrically connected, and a battery pack case 2 that houses the assembly. The cylindrical battery 1 is a battery according to the above-described embodiment. In the drawing, for convenience of illustration, components such as bus bars for achieving the electrical connection of the cylindrical batteries 1, cooling units, external terminals, and the like are omitted from illustration.

[0225] The battery pack 3 can be mounted on an automobile. As an example, the automobile can be an electric automobile, a hybrid automobile, or a plug-in hybrid automobile. The automobile includes a four-wheeled automobile or a two-wheeled automobile.

[0226] Figure 20 FIG. 5 is a diagram for explaining an automobile 50 including Figure 19 the battery pack 3.

[0227] Referring to Figure 20 , the automobile 5 according to the embodiment of the present application includes the battery pack 3 according to the embodiment of the present application. The automobile 5 operates using electric power supplied from the battery pack 3 according to the embodiment of the present application.

[0228] The above-described embodiments are merely exemplary in all aspects and are to be interpreted as non-limiting embodiments, and the scope of protection of the present application is to be indicated by the claims, not by the above-described detailed description. In addition, it is to be interpreted that all modifications and transformable modes derived from the meaning and scope of the claims and equivalent concepts thereto are included in the scope of protection of the present application.

[0229] While the present application has been described with reference to the example embodiments illustrated in the drawings, the present application is not limited to the embodiments and drawings disclosed herein, and it will be obvious to those skilled in the art that various modifications can be made within the technical idea of the present application. Also, even if the effects resulting from the configurations according to the present application are not explicitly mentioned in the above description of the embodiments of the present application, it should be understood that the effects are still implied based on the corresponding configurations.

Claims

1. A cylindrical battery, characterized in that, include: An electrode assembly having a first electrode tab made of an uncoated portion exposed at one end; A battery casing that houses the aforementioned electrode assembly; as well as The current collector contacts the first electrode tab and the inner circumferential surface of the battery casing, thereby electrically connecting the first electrode tab to the battery casing. The aforementioned current collector includes: An annular portion surrounds the central axis of the electrode assembly to define an opening area that exposes the first electrode tab. The electrode tab connection portion extends from the inside of the annular portion adjacent to the opening region toward the opening region and connects with the first electrode tab exposed through the opening region; and The housing joint extends from the outer side of the annular portion toward the inner circumferential surface of the battery housing, thereby joining with the battery housing.

2. The cylindrical battery according to claim 1, characterized in that, The aforementioned tab joint is in face-to-face contact with the aforementioned first electrode tab, and the aforementioned housing joint is in face-to-face contact with the inner circumferential surface of the aforementioned battery housing.

3. The cylindrical battery according to claim 1, characterized in that, The aforementioned annular portion includes: Multiple first parts are arranged circumferentially from a first radial position of the exposed area of ​​the aforementioned first electrode tab; A plurality of second portions, located at second radii outside the aforementioned first radii, are positioned between adjacent first portions in the circumferential direction; and The third part connects the first part that is adjacent to it in the circumferential direction and the second part that is located between them, thereby defining the space for the extension of the aforementioned tab joint.

4. The cylindrical battery according to claim 3, characterized in that, The first part, the second part, and the third part mentioned above are in face-to-face contact with the first electrode tab mentioned above.

5. The cylindrical battery according to claim 3, characterized in that, The aforementioned tab joint extends from the aforementioned second part in a centripetal direction toward the aforementioned electrode assembly.

6. The cylindrical battery according to claim 1, characterized in that, The aforementioned tab joints extend into a straight line shape, an arc shape, or a combination of these shapes.

7. The cylindrical battery according to claim 5, characterized in that, There is a gap between the aforementioned tab joint and the aforementioned third part.

8. The cylindrical battery according to claim 7, characterized in that, The third part mentioned above extends into a straight line shape, an arc shape, or a combination of both.

9. The cylindrical battery according to claim 7, characterized in that, The aforementioned gaps extend into straight lines, arcs, or combinations thereof.

10. The cylindrical battery according to claim 1, characterized in that, The aforementioned opening region extends radially from the center of the aforementioned electrode assembly.

11. The cylindrical battery according to claim 1, characterized in that, The distance from the inside of the annular portion to the edge of the winding hole of the electrode assembly is greater than or equal to the length of the tab connection portion.

12. The cylindrical battery according to claim 1, characterized in that, An opening is provided on one side of the aforementioned battery casing along its axial direction. The aforementioned housing joint is connected to the inner circumferential surface of the aforementioned battery housing, which has the aforementioned open portion.

13. The cylindrical battery according to claim 12, characterized in that, The aforementioned housing joint is located near the open portion of the aforementioned battery housing and is connected to the inner circumferential surface of the recessed rolled edge portion in the inward direction.

14. The cylindrical battery according to claim 13, characterized in that, Also includes: A housing cover that covers the aforementioned open portion; as well as A sealing gasket is sandwiched between the aforementioned housing sleeve and the aforementioned battery housing. The aforementioned housing joint is fixed by being sandwiched between the aforementioned sealing gasket and the aforementioned rolled edge portion.

15. The cylindrical battery according to claim 1, characterized in that, The aforementioned electrode assembly also includes a second electrode tab composed of an uncoated portion. The aforementioned second electrode tab is electrically connected to a terminal located on the other axial side of the aforementioned battery casing.

16. The cylindrical battery according to claim 1, characterized in that, A winding hole is provided at the center of the aforementioned electrode assembly. A current collector hole is provided at the center of the aforementioned annular portion, facing the aforementioned winding hole.

17. The cylindrical battery according to claim 1, characterized in that, The aforementioned tab connection and the aforementioned housing connection are connected via the aforementioned annular portion.

18. The cylindrical battery according to claim 1, characterized in that, The aforementioned annular portion forms a closed loop.

19. The cylindrical battery according to claim 1, characterized in that, The aforementioned annular portion has one or more cuts.

20. The cylindrical battery according to claim 1, characterized in that, The aforementioned housing joint includes: The contact portion, which is attached to the inner circumferential surface of the aforementioned battery casing; and A connecting portion that connects the aforementioned contact portion and the aforementioned annular portion.

21. The cylindrical battery according to claim 20, characterized in that, The aforementioned contact portion extends in a direction corresponding to the circumferential direction of the inner circumferential surface of the battery casing.

22. The cylindrical battery according to claim 20, characterized in that, The aforementioned connecting portion extends in both the centrifugal and axial directions.

23. The cylindrical battery according to claim 20, characterized in that, The aforementioned connecting portion has one or more bends.

24. The cylindrical battery according to claim 23, characterized in that, The aforementioned curved portion protrudes in the centripetal direction or axial direction of the aforementioned electrode assembly.

25. A battery pack, characterized in that, include: The cylindrical battery according to any one of claims 1 to 24.

26. A car, characterized in that, It includes the battery pack as described in claim 25.

27. A current collector for electrically connecting an electrode assembly included in a cylindrical battery to a battery casing, characterized in that, include: An annular portion surrounds the central axis of the electrode assembly, so as to define an opening area at one end of the electrode assembly where an electrode tab made of an uncoated portion is exposed. The electrode tab connection portion extends from the inside of the annular portion adjacent to the opening region toward the opening region and connects with the electrode tab exposed through the opening region; and The housing joint extends from the outer side of the annular portion toward the inner circumferential surface of the battery housing and is joined to the battery housing.

28. The current collector according to claim 27, characterized in that, The aforementioned annular portion includes: Multiple first parts are arranged circumferentially, separated from the first radial position of the exposed area of ​​the aforementioned electrode tab; A plurality of second portions, located at second radii outside the aforementioned first radii, are positioned between adjacent first portions in the circumferential direction; and The third part connects the first part that is adjacent to it in the circumferential direction and the second part that is located between them, thereby defining the space for the extension of the aforementioned tab joint.

29. The current collector according to claim 28, characterized in that, The first part, the second part, and the third part mentioned above are located on the same plane.

30. The current collector according to claim 28, characterized in that, The aforementioned tab joint extends from the aforementioned second part in a centripetal direction toward the aforementioned electrode assembly.

31. The current collector according to claim 27, characterized in that, The aforementioned tab joints extend into a straight line shape, an arc shape, or a combination of these shapes.

32. The current collector according to claim 30, characterized in that, There is a gap between the aforementioned tab joint and the aforementioned third part.

33. The current collector according to claim 32, characterized in that, The third part mentioned above extends into a straight line shape, an arc shape, or a combination of both.

34. The current collector according to claim 32, characterized in that, The aforementioned gaps extend into straight lines, arcs, or combinations thereof.

35. The current collector according to claim 27, characterized in that, The aforementioned opening region extends radially from the center of the aforementioned electrode assembly.

36. The current collector according to claim 27, characterized in that, A current collector hole is provided at the center of the aforementioned annular portion.

37. The current collector according to claim 27, characterized in that, The aforementioned tab connection and the aforementioned housing connection are connected via the aforementioned annular portion.

38. The current collector according to claim 27, characterized in that, The aforementioned annular portion forms a closed loop.

39. The current collector according to claim 27, characterized in that, The aforementioned annular portion has one or more cut portions.

40. The current collector according to claim 27, characterized in that, The aforementioned housing joint includes: The contact portion, which contacts the aforementioned battery casing; and A connecting portion that connects the aforementioned contact portion and the aforementioned annular portion.

41. The current collector according to claim 40, characterized in that, The aforementioned contact portion extends in the circumferential direction.

42. The current collector according to claim 40, characterized in that, The aforementioned connection extends in both the centrifugal and axial directions of the aforementioned electrode assembly.

43. The current collector according to claim 40, characterized in that, The aforementioned connecting portion has one or more bends.

44. The current collector according to claim 43, characterized in that, The aforementioned curved portion protrudes in the centripetal direction or axial direction of the aforementioned electrode assembly.

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