Battery, and battery pack and vehicle including same

Abstract

The present invention relates to a battery comprising: an electrode assembly; a battery case configured to accommodate the electrode assembly through an opening portion formed on one side of the battery case; a battery terminal configured to be electrically connected to the electrode assembly through closing portions provided on opposite sides of the opening portion of the battery case; and a current collector including a first coupling portion configured to be electrically coupled to the electrode assembly, a second coupling portion configured to be electrically coupled to the battery terminal, and a bridge portion configured to electrically connect the first coupling portion and the second coupling portion, and at least a portion of a region adjacent to the second coupling portion in the bridge portion has a reduced cross-sectional area.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a battery, and a battery pack and a vehicle including the same.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2023-0156709, filed on November 13, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.

[0003] This application is based on and claims priority to Korean Patent Application No. 10-2024-0062722, filed on May 13, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. BACKGROUND

[0004] The fusing devices currently used in secondary batteries include PTC (Positive Temperature Coefficient) thermistors, TCOs (thermal cutouts), etc. However, PTC thermistors or TCOs have the following disadvantages: their own resistance increases as they repeatedly work, thereby increasing the overall resistance of the circuit.

[0005] In addition, all of the above devices work by heat generated by overcurrent. That is, the above devices work to cut off the flow of current only when overcurrent occurs in the circuit current path due to overcharging or the like and the temperature thereby increases.

[0006] Therefore, the above devices can work to block overcurrent only after the occurrence of a situation threatening safety due to heat generation, and they cannot immediately block overcurrent after the occurrence of a cause that can increase the temperature. As described above, when the internal pressure of a secondary battery increases due to an abnormal temperature increase inside the secondary battery, if overcurrent is not blocked at an appropriate time, a safety problem such as a fire or explosion can occur.

[0007] In addition, since the above devices simply work depending on the temperature, they are difficult to use in secondary batteries that exhibit high output, such as battery packs used in vehicles. That is, a battery pack for a vehicle requires a high c-rate, which can cause a large amount of heat to be generated, but devices such as PTC (Positive Temperature Coefficient) thermistors, TCOs (thermal cutouts), and thermal fuses can have a problem of premature work when set in a high temperature environment.

[0008] Therefore, there is a need to provide a secondary battery that can be used in a high current flow environment, which has a structure that can cut off current before the temperature increases to a level that can cause a safety problem when an event that can cause the temperature to increase (e.g., an increase in the internal pressure of the secondary battery) occurs. SUMMARY

[0009] Technical Problem

[0010] The present disclosure aims to solve the problems in the related art, and thus an object of the present disclosure is to enable rapid disconnection of an electrical connection when overcurrent exceeding a standard value occurs in a battery.

[0011] However, the technical problems which the present disclosure aims to solve are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art through the following description of the invention.

[0012] Technical Solution

[0013] In one aspect of the present disclosure, a battery includes an electrode assembly, a battery case configured to receive the electrode assembly through an opening formed on one side, a battery terminal configured to be electrically connected to the electrode assembly through a closed portion provided on an opposite side of the opening of the battery case, and a current collector including a first coupling portion configured to be electrically coupled to the electrode assembly, a second coupling portion configured to be electrically coupled to the battery terminal, and a bridging portion configured to electrically connect the first coupling portion and the second coupling portion to each other, and the bridging portion is configured such that at least a portion of a region adjacent to the second coupling portion has a reduced cross-sectional area.

[0014] The bridging portion can include a first region configured to be connected to the second coupling portion, and a second region provided at a predetermined distance from the first region in a direction away from the second coupling portion.

[0015] A width of the first region can be configured to be smaller than a width of the second region.

[0016] A distance from a center of the second coupling portion to the first region can be configured to be 0.5 times or less of the current collector radius.

[0017] The bridging portion can be configured such that its width gradually decreases from the second region to the first region.

[0018] The first region can include a cutout portion formed on at least one side of the bridging portion in a width direction.

[0019] A width of the bridging portion can be configured to be constant in a region from the second region to the cutout portion.

[0020] The first coupling portion and the second coupling portion can be spaced apart from each other in a radial direction of the electrode assembly.

[0021] The current collector can have a slit line configured to separate the first coupling portion and the second coupling portion from each other.

[0022] The current collector can include edges on outer peripheries of the first coupling portion and the second coupling portion, and the bridge portion can be configured to connect the edges and the second coupling portion.

[0023] In another aspect of the disclosure, a battery pack including the battery according to the disclosure is provided.

[0024] In still another aspect of the disclosure, a vehicle including the battery pack according to the disclosure is provided.

[0025] Advantageous Effects

[0026] According to one aspect of the disclosure, when overcurrent exceeding a reference value occurs in a battery, an electrical connection can be quickly cut off, thereby ensuring safety in use of the battery.

[0027] In addition, the disclosure can have various other effects, which will be described in various embodiments, or effects that are easily inferred by those skilled in the art will be omitted from the description. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings illustrate preferred embodiments of the disclosure and, together with the foregoing disclosure, provide further understanding of the technical features of the disclosure, and therefore, the disclosure should not be construed as being limited to the accompanying drawings.

[0029] Figure 1 FIG. 1 is a diagram illustrating an upper structure of a battery according to an embodiment of the disclosure.

[0030] Figure 2 FIG. 2 is a diagram illustrating a current collector (first current collector) included in a battery according to an embodiment of the disclosure.

[0031] Figure 3 FIG. 3 is a diagram illustrating a current collector (first current collector) included in a battery according to another embodiment of the disclosure.

[0032] Figure 4 FIG. 4 is a CT image illustrating a state in which a first portion is fused when overcurrent occurs in a current collector (first current collector) included in a battery according to an embodiment of the disclosure.

[0033] Figure 5 FIG. 5 is a diagram illustrating a temperature distribution according to a position of a current collector (first current collector) included in a battery according to an embodiment of the disclosure.

[0034] Figure 6 FIG. 6 is a diagram illustrating a temperature distribution according to a position of a current collector (first current collector) included in a battery according to another embodiment of the disclosure. Figure 5a temperature profile of a position of the current collector (first current collector) in the battery.

[0035] Figure 7 is a view showing a lower structure of a battery according to an embodiment of the disclosure.

[0036] Figure 8 is a view showing a battery pack according to an embodiment of the disclosure.

[0037] Figure 9 is a view showing a vehicle according to an embodiment of the disclosure. DETAILED DESCRIPTION

[0038] Hereinafter, preferred embodiments of the disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the term used in the specification and the appended claims should not be interpreted as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present disclosure on the basis of the principle that the inventor can appropriately define the term to best explain the idea of the present disclosure.

[0039] Accordingly, the description set forth herein is merely illustrative of preferred examples of the disclosure and is not intended to limit the scope of the disclosure as there are obvious modifications from the preferred examples many alternatives, equivalents, and modifications thereof.

[0040] Further, the disclosure can include various embodiments. Redundant descriptions of configurations substantially the same or similar will be omitted from each of the embodiments, and will be described based on differences therebetween.

[0041] Reference will be made to Figures 1 to 4 A battery 1 according to an embodiment of the disclosure will be described.

[0042] Figure 1 is a view showing an upper structure of a battery according to an embodiment of the disclosure. Figure 2 is a view showing a current collector (first current collector) included in a battery according to an embodiment of the disclosure. Figure 3 is a view showing a current collector (first current collector) included in a battery according to another embodiment of the disclosure. Further, Figure 4 is a CT image showing a state in which a first portion is fused when an overcurrent occurs in a current collector (first current collector) included in a battery according to an embodiment of the disclosure.

[0043] Reference will be made to Figures 1 to 3 The battery 1 according to an embodiment of the disclosure can include an electrode assembly 10, a battery case 20, a battery terminal 30, and a current collector (first current collector) 40. The battery 1 can be a secondary battery configured to be rechargeable. The battery 1 can be, for example, a cylindrical battery.

[0044] The electrode assembly 10 can include a first electrode having a first polarity, a second electrode having a second polarity opposite to the first polarity, and a separator interposed between the first electrode and the second electrode. The electrode assembly 10 can be configured in a form in which a laminate including the first electrode, the second electrode, and the separator is wound in one direction. In a case in which the electrode assembly 10 is configured in the wound form, a central winding hole 10a can be formed in a region that is a center of winding.

[0045] The first electrode can include a first uncoated region 11 that is a region in which an electrode active material is not applied. The first uncoated region 11 can extend from one end of the first electrode in a winding direction of the electrode assembly 10. Accordingly, the first uncoated region 11 can be disposed on a first surface that is substantially perpendicular to an outer surface of the electrode assembly 10.

[0046] The second electrode can include a second uncoated region 12 that is a region in which an electrode active material is not applied (see Figure 6 ). The second uncoated region 12 can extend from one end of the second electrode in the winding direction of the electrode assembly 10. Accordingly, the second uncoated region 12 can be disposed on a second surface (opposite to the first surface) that is substantially perpendicular to the outer surface of the electrode assembly 10.

[0047] Although not specifically shown in the drawings, the first uncoated region 11 and / or the second uncoated region 12 can include a plurality of segments formed to be separated in the winding direction of the electrode assembly 10. The segments can be formed by cutting the first uncoated region 11 and / or the second uncoated region 12 to a predetermined depth. The plurality of segments can be curved substantially in a radial direction of the electrode assembly 10. In this case, some segments that are adjacent to each other in the radial direction can overlap each other.

[0048] The battery case 20 can be configured to receive the electrode assembly 10 through an opening formed through one side thereof. The battery case 20 can be formed with a closed portion on an opposite side of the opening. The battery case 20 can include an electrically conductive metal. The battery case 20 can be electrically connected with the second electrode of the electrode assembly 10.

[0049] The battery terminal 30 can be configured to be electrically connected with the electrode assembly 10 through the closed portion formed on the opposite side of the opening of the battery case 20. The battery terminal 30 can be electrically connected with the first electrode of the electrode assembly 10, for example. In this case, the battery terminal 30 can serve as a first terminal of the battery 1. The battery terminal 30 and the battery case 20 can have opposite polarities, and in this case, a first sealing member G1 can be disposed between the battery case 20 and the battery terminal 30 to prevent contact between these components and to ensure the sealing of the battery case 20.

[0050] The battery terminal 30 can include a first portion 31 and a second portion 32. The first portion 31 can be configured to be electrically coupled with the current collector 40 at the inside of the battery case 20. The first portion 31 can be disposed at a position corresponding to the center winding hole 10a of the electrode assembly 10. The second portion 32 can be exposed to the outside of the battery case 20. The second portion 32 can be positioned substantially at the center of the closed portion of the battery case 20.

[0051] The battery terminal 30 can include a third portion 33 disposed on the outside of the first portion 31. The third portion 33 can be riveted toward the closed portion of the battery case 20 to fix the battery terminal 30 to the battery case 20.

[0052] The current collector 40 can be configured to electrically connect the battery terminal 30 and the electrode assembly 10. The current collector 40 can be electrically connected with the first electrode of the electrode assembly 10.

[0053] An insulator (IS) can be interposed between the current collector 40 and the inner surface of the closed portion of the battery case 20 to prevent contact between the battery case 20 and the current collector 40 having opposite polarities.

[0054] The current collector 40 can be disposed on the first surface of the electrode assembly 10. Referring to Figure 2 and Figure 3 , the current collector 40 can include a first coupling portion 41, a second coupling portion 42, and a bridging portion 43.

[0055] The first coupling portion 41 can be configured to be electrically coupled with the electrode assembly 10. The first coupling portion 41 can be coupled to the first uncoated region 11 of the electrode assembly 10. The first coupling portion 41 can be coupled to a coupling surface formed by bending the first uncoated region 11. At least a portion of the first coupling portion 41 can be coupled to the first uncoated region 11 in a region in which the number of overlapping layers of segments of the first uncoated region 11 is the greatest.

[0056] The second coupling portion 42 can be electrically coupled with the first portion 31 of the battery terminal 30. The second coupling portion 42 can be welded to the first portion 31 of the battery terminal 30 by means of a welding tool inserted through the center winding hole 10a of the electrode assembly 10 or by means of a laser beam radiated through the center winding hole 10a.

[0057] The bridging portion 43 can be configured to electrically connect the first coupling portion 41 and the second coupling portion 42. A plurality of first coupling portions 41 can be disposed along the circumference of the battery 1. In this case, a plurality of bridging portions 43 can also be provided.

[0058] In particular, referring to Figure 2 and Figure 3The bridging portion 43 can be configured such that at least a portion of the area adjacent to the second coupling portion 42 has a reduced cross-sectional area. In particular, as shown in Figure 4 When an overcurrent exceeding a reference value occurs in the battery 1, the portion of the bridging portion 43 having a reduced cross-sectional area can break.

[0059] According to the implemented configuration of the present disclosure, when the battery 1 is abnormal, the current collector 40 can itself be fused to be short-circuited without ignition. In addition, when an overcurrent occurs in the battery 1, the overcurrent can be rapidly blocked by inducing a rapid breakage of the current collector 40 itself. Thus, the safety of the battery 1 can be ensured.

[0060] In particular, the portion of the bridging portion 43 having a reduced cross-sectional area can be substantially provided at a portion where the second coupling portion 42 and the bridging portion 43 are connected. More specifically, the bridging portion 43 can include a first area A1 and a second area A2. The first area A1 can be an area adjacent to the second coupling portion 42. The first area A1 can be an area connected to the second coupling portion 42. In addition, the first area A1 can be configured to break when an overcurrent exceeding a reference value occurs in the battery 1.

[0061] The second area A2 can be provided at a predetermined distance from the first area A1 in a direction away from the second coupling portion 42. That is, the first area A1 can be provided more inward in a radial direction than the second area A2.

[0062] According to the implemented configuration of the present disclosure, since the first area A1 that breaks when an overcurrent occurs in the battery 1 is provided at a portion where the second coupling portion 42 and the bridging portion 43 of the current collector 40 are connected, the resistance can be partially increased in a path of a large current from or to the battery terminal 30, thereby more effectively inducing a breakage of the current collector 40.

[0063] In addition, the width of the first area A1 can be configured to be smaller than the width of the second area A2. The first area A1 can denote the portion of the bridging portion 43 having a reduced cross-sectional area. Thus, when an overcurrent occurs in the battery 1, the first area A1 having a relatively small cross-sectional area can rapidly break to rapidly block the overcurrent.

[0064] Next, a preferred position of the first area A1 of the present disclosure will be described with reference to Figure 5 and Figure 6 Figure 5 is a graph showing a temperature distribution according to a position of a current collector (first current collector) included in a battery according to an embodiment of the present disclosure, and Figure 6 is a temperature profile according to a position of the current collector (first current collector) in Figure 5

[0065] ​​When overcurrent occurs in the battery 1, heat can move outward in a radial direction from the center of the second coupling portion 42, for example, to the bridging portion 43. In this case, referring to Figure 5 and Figure 6 , the temperature of the area adjacent to the second coupling portion 42 (denoted as T1 in Figure 5 , can be the highest, about 650 degrees Celsius or higher. In particular, the temperature of the area where the second coupling portion 42 and the bridging portion 43 are connected can be the highest.

[0066] Accordingly, the first area A1 can be positioned more inward than the outer side in the radial direction of the current collector 40. For example, as in the embodiment shown in Figure 2 and Figure 3 , the distance d from the center of the second coupling portion 42 to the first area A1 of the bridging portion 43 can be configured to be 0.5 times or less of the radius R of the current collector 40.

[0067] According to the implemented configuration of the present disclosure, when an abnormal situation occurs in the battery 1, the connecting portion of the second coupling portion 42 and the bridging portion 43 where heat is most concentrated in the current collector 40 can be broken. Accordingly, it is possible to quickly cut off the electrical connection of the battery 1, thereby ensuring the safety in use of the battery 1.

[0068] Next, various embodiments of the bridging portion 43 of the current collector 40 of the present disclosure will be described with reference to Figure 2 and Figure 3 .

[0069] The bridging portion 43 can include a portion whose width w decreases as it approaches the second coupling portion 42. For example, as in the embodiment shown in Figure 2 , the bridging portion 43 can be configured such that the width w gradually decreases from the second area A2 to the first area A1. That is, the bridging portion 43 can be configured in a trapezoidal shape.

[0070] In this case, the width of the first area A1 can be about 0.5 mm to 6.0 mm. Alternatively, the width of the first area A1 can be about 1 mm to 4 mm. Alternatively, the width of the first area A1 can be about 2 mm to 4 mm. Alternatively, the width of the first area A1 can be about 1.5 mm to 3.5 mm. Alternatively, the width of the first area A1 can be about 1.5 mm to 2 mm.

[0071] Further, the width of the second area A2 can be about 0.5 mm to 6.0 mm. Alternatively, the width of the second area A2 can be about 2 mm to 5.5 mm. Alternatively, the width of the second area A2 can be about 2.5 mm to 5 mm. Alternatively, the width of the second area A2 can be about 3 mm to 4.5 mm.

[0072] As another embodiment, as shown in the embodiment of Figure 3 The first region A1 can include a notch portion N. The notch portion N can be formed on at least one side in the width direction of the bridge portion 43. The notch portion N can be configured in the form of a groove that is recessed inward from at least one side in the width direction of the bridge portion 43 at a portion where the bridge portion 43 is connected to the second coupling portion 42. For example, as shown in Figure 3 The notch portion N can be formed so as to face each other on both sides in the width direction of the bridge portion 43.

[0073] The notch portion N can be configured to be substantially circular, for example. The notch portion N can be configured to be substantially semicircular, for example. However, the notch portion N is not limited to the above-described example shapes, and any other shape that can reduce the cross-sectional area of the current path and increase the resistance can be applied.

[0074] As described above, the notch portion N can be formed in a region adjacent to the second coupling portion 42. With the formation of the notch portion N, the width of the first region A1 can become smaller than the width of the second region A2. According to the embodiment configuration of the present disclosure, when an overcurrent exceeding a reference value occurs in the battery 1, a fracture of the current collector 40 can be induced in a region between the notch portions N. Thus, the overcurrent can be quickly blocked.

[0075] Further, the width w of the bridge portion 43 can be configured to be constant in a region from the second region A2 to the notch portion N. For example, the width w of the bridge portion 43 can be about 3 mm.

[0076] Referring to Figure 2 and Figure 3 The current collector 40 can be configured such that the above-described first coupling portion 41 and the second coupling portion 42 are spaced apart from each other in the radial direction of the electrode assembly 10. That is, an empty space can be formed in the radial direction between the first coupling portion 41 and the second coupling portion 42.

[0077] In particular, the current collector 40 can have a slit line 44. The slit line 44 can be formed by perforating the current collector 40. That is, the slit line 44 can be formed by perforating the current collector 40 configured to be a substantially circular plate. The first coupling portion 41, the second coupling portion 42, and the bridge portion 43 of the current collector 40 can be formed by the slit line 44. In this case, the first coupling portion 41 and the second coupling portion 42 can be spaced apart from each other in the radial direction by the slit line 44. Further, the first coupling portion 41 and the bridge portion 43 can be spaced apart from each other in the circumferential direction by the slit line 44.

[0078] As described above, when the structure of each component of the current collector 40 is distinguished by the slit line 44, a complicated process for forming each component (i.e., the first coupling portion 41, the second coupling portion 42, and the bridge portion 43) is not required, and the current collector 40 can be relatively easily manufactured by simply forming a cutting line on a metal plate.

[0079] Further, in forming the slit line 44, a notch can also be made to form Figure 2 a trapezoidal shape of the bridge portion 43 as shown or Figure 3 a notch portion N of the bridge portion 43 as shown. As a result, since the manufacturing process of the current collector 40 is simplified, productivity or workability can be improved when the battery 1 is manufactured.

[0080] Further, the current collector 40 can have an edge 45 positioned on the outer periphery of the first coupling portion 41 and the second coupling portion 42. In this case, the bridge portion 43 can be configured to connect the edge 45 and the second coupling portion 42. Further, in this case, the second region A2 can denote a portion in which the bridge portion 43 is connected to the edge 45.

[0081] As shown in the embodiments of the disclosure, in the case in which the first coupling portion 41 and the second coupling portion 42 are indirectly connected by the edge 45 rather than being directly connected to each other, an impact applied to the battery 1 can be dispersed. That is, the transmission of an impact applied to the weld of the first coupling portion 41 to the weld of the second coupling portion 42 can be minimized, and the transmission of an impact applied to the weld of the second coupling portion 42 to the first coupling portion 41 can also be minimized.

[0082] Figure 7 is a view showing a lower structure of a battery according to an embodiment of the disclosure.

[0083] Referring to Figure 7 , the battery 1 according to an embodiment of the disclosure can include a current collector (second current collector) 50. The current collector 50 can be configured to electrically connect the electrode assembly 10 and the battery case 20. The current collector 50 can be electrically connected to the second electrode of the electrode assembly 10. The current collector 50 can be electrically coupled to the second uncoated region 12 provided on the second surface of the electrode assembly 10. The current collector 50 can be electrically coupled to the inner surface of the battery case 20. The current collector 50 can be electrically coupled to the crimped portion 21 formed by pressing the outer peripheral surface of the battery case 20.

[0084] The battery 1 can include a cover 60. The cover 60 can be configured to close an opening of the battery case 20. The cover 60 can be fixed by a crimping portion 22 configured to extend from a crimping portion 21 of the battery case 20 and bent to surround an edge of the cover 60. A sealing member (second sealing member) G2 can be interposed between the cover 60 and an inner surface of the battery case 20. The cover 60 can include a vent portion 61 configured to be weaker than the rest of the area. The vent portion 61 can be configured to partially reduce the thickness of the cover 60. The vent portion 61 can be configured to be broken when the internal pressure of the battery 1 increases to a predetermined pressure or more.

[0085] Figure 8 FIG. 1 is a view illustrating a battery according to an embodiment of the disclosure.

[0086] Referring to Figure 8 , a battery pack 3 according to an embodiment of the disclosure can include a battery 1 according to an embodiment of the disclosure and a battery pack case 2 accommodating the battery 1. A plurality of batteries 1 can be provided, and the plurality of batteries 1 can be electrically connected to each other. The battery 1 of the disclosure can be configured such that the battery terminal 30 and the closed portion of the battery case 20 serve as a first electrode terminal and a second electrode terminal, respectively. Accordingly, the plurality of batteries 1 can be provided in the battery pack case 2 such that the battery terminals 30 of all the batteries 1 face upward, so that electrical connection can be made at the top of the battery 1.

[0087] Figure 9 FIG. 2 is a view illustrating a vehicle according to an embodiment of the disclosure.

[0088] Referring to Figure 9 , a vehicle 5 according to an embodiment of the disclosure can include a battery pack 3 according to an embodiment of the disclosure. The vehicle 5 can be configured to operate by power supplied from the battery pack 3. The vehicle 5 can be, for example, an electric vehicle or a hybrid vehicle.

[0089] As described above, although the disclosure has been described with reference to limited embodiments and drawings, the disclosure is not limited thereto, and those skilled in the art to which the disclosure pertains can make various modifications and changes within the technical idea of the disclosure and the equivalent scope of the claims described below. Accordingly, the scope of the disclosure should be interpreted by the claims described below to encompass the various modifications described above.

Claims

1. A battery, the battery comprising: Electrode assembly; A battery housing configured to receive the electrode assembly through an opening formed on one side; A battery terminal configured to be electrically connected to the electrode assembly via a closed portion disposed on the opposite side of the opening in the battery housing; as well as The current collector includes a first connection portion configured to be electrically connected to the electrode assembly, a second connection portion configured to be electrically connected to the battery terminal, and a bridging portion configured to electrically connect the first connection portion and the second connection portion to each other, wherein the bridging portion is configured such that at least a portion of the region adjacent to the second connection portion has a reduced cross-sectional area.

2. The battery according to claim 1, in, The bridging portion includes: A first region, configured to connect to the second connection portion; and The second region is located at a predetermined distance from the first region in a direction away from the second connecting portion.

3. The battery according to claim 2, in, The width of the first region is configured to be smaller than the width of the second region.

4. The battery according to claim 2, in, The distance from the center of the second connecting portion to the first region is configured to be 0.5 times or less the radius of the current collector.

5. The battery according to claim 2, in, The bridging portion is configured such that the width of the bridging portion gradually decreases from the second region toward the first region.

6. The battery according to claim 2, in, The first region includes a cutout formed on at least one side of the bridging portion along its width direction.

7. The battery according to claim 6, in, The width of the bridging portion is configured to be constant in the region from the second region to the cutout portion.

8. The battery according to claim 1, in, The first connecting portion and the second connecting portion are spaced apart from each other in the radial direction of the electrode assembly.

9. The battery according to claim 8, in, The current collector has a slit line configured to separate the first connecting portion and the second connecting portion from each other.

10. The battery according to claim 8, in, The current collector includes edges located on the outer periphery of the first connecting portion and the outer periphery of the second connecting portion, and The bridging portion is configured to connect the edge and the second connecting portion.

11. A battery pack comprising a battery according to any one of claims 1 to 10.

12. A vehicle comprising a battery according to any one of claims 1 to 10.

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