Battery, battery pack and vehicle including same

Abstract

A battery according to an embodiment of the present disclosure may include: an electrode assembly including a first uncoated portion extending on a first surface thereof, where the first surface is configured to include a first region covered by the first uncoated portion and a second region not covered by the first uncoated portion; a battery case configured to accommodate the electrode assembly through an opening formed on one side of the battery case; and a current collector disposed on the first surface of the electrode assembly to be configured to be electrically connected to the electrode assembly, and having a current collector opening portion formed in a region of the electrode assembly corresponding to a second region of the electrode assembly.

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 Korean Patent Application No. 10-2023-0193545 filed on December 27, 2023, and Korean Patent Application No. 10-2024-0064527 filed on May 17, 2024, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein in their entirety by reference, and claims priority to both applications. BACKGROUND

[0003] In a cylindrical secondary battery, electrolyte impregnation is considered to be an important factor in achieving high energy density and high output performance. The amount of electrolyte impregnation is closely related to the performance of the battery, and if the impregnation of the electrolyte is reduced due to structural problems, it can lead to a decrease in the performance of the battery.

[0004] Such a decrease in the performance of the battery includes a decrease in the actual capacity compared to the design capacity of the electrode, an increase in the resistance of the battery itself, a non-uniformity in the voltage of the battery (low voltage, etc.), a safety problem of the secondary battery due to lithium deposition, and a decrease in the cycle of the battery.

[0005] Therefore, there is a need to enhance the impregnation of the electrolyte by improving the structure of the components constituting the battery, thereby improving the performance of the secondary battery. SUMMARY

[0006] TECHNICAL PROBLEM

[0007] The present disclosure aims to solve the problems of the prior art, and thus the present disclosure aims to provide a battery having a structure with improved electrolyte impregnation performance.

[0008] In another aspect, the present disclosure aims to greatly improve the safety of use of the battery and the battery pack by reducing the risk of side cracking of the battery when there is a problem such as a thermal event occurring inside the battery case and / or an increase in internal pressure, by concentrating heat and / or pressure in the center of the electrode assembly rather than the side of the battery case.

[0009] However, the technical problems to be solved by the present disclosure are not limited to the above-mentioned problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the description of the present invention described below.

[0010] TECHNICAL SOLUTION

[0011] In an aspect of the disclosure, a battery is provided, including: an electrode assembly having a first uncoated portion extending on a first surface, the first surface including a first area covered by the first uncoated portion and a second area not covered by the first uncoated portion; a battery case configured to accommodate the electrode assembly through an opening formed on one side; and a current collector disposed on the first surface of the electrode assembly to be electrically connected to the electrode assembly, and having a current collector opening formed in an area corresponding to the second area of the electrode assembly.

[0012] The first uncoated portion can be configured to be curved in a radial direction of the electrode assembly to cover the first surface of the electrode assembly.

[0013] The second area can be positioned more inward than the first area.

[0014] The second area can be disposed between a periphery of a center-wound hole formed in a core of the electrode assembly and a position spaced apart from the periphery outward by a predetermined distance in a radial direction of the electrode assembly.

[0015] The first uncoated portion can be configured such that a plurality of layers formed at least partially along the radial direction of the electrode assembly overlap each other in an overlapping area.

[0016] The electrode assembly can include a maximum overlapping area in which a number of overlapping layers of the first uncoated portion is maximum.

[0017] The second area can be positioned more inward than the maximum overlapping area.

[0018] The current collector can be electrically coupled to the first uncoated portion.

[0019] The current collector can be electrically coupled to the battery case.

[0020] The current collector opening can include a plurality of holes disposed to be spaced apart from each other in an area corresponding to the second area.

[0021] The current collector opening can include a plurality of slits extending in a circumferential direction of the electrode assembly in an area corresponding to the second area.

[0022] The current collector opening can have a current collector hole formed at a position corresponding to the center-wound hole of the electrode assembly.

[0023] The current collector opening can be formed by expanding the current collector hole.

[0024] In another aspect of the present disclosure, a battery pack including the battery according to an embodiment of the present disclosure is provided.

[0025] In another aspect of the present disclosure, a vehicle including the battery pack according to an embodiment of the present disclosure is provided.

[0026] Advantageous Effects

[0027] According to one aspect of the present application, the impregnation performance of an electrolyte in a battery can be improved.

[0028] According to another aspect of the present disclosure, when there is a problem such as a thermal event and / or an increase in internal pressure occurring inside the battery case, heat and / or pressure can be concentrated in the center of the electrode assembly rather than the side of the battery case, thereby mitigating the risk of the battery side cracking and greatly improving the use safety of the battery and the battery pack.

[0029] However, the effects obtainable from the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned above will be clearly understood by those skilled in the art from the description of the present application described below. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, provide further understanding of the technical features of the present disclosure, and therefore, the present disclosure is not to be construed as being limited to the drawings.

[0031] Figure 1 is a view showing the structure of the upper portion of a battery according to an embodiment of the present disclosure.

[0032] Figure 2 is a view showing Figure 1 a battery in, in which the top of the battery case is open.

[0033] Figure 3 is a view showing an electrode assembly according to an embodiment of the present disclosure.

[0034] Figure 4 is a partial cross-sectional view of an electrode assembly according to an embodiment of the present disclosure.

[0035] Figure 5 is a view showing a current collector (first current collector) according to an embodiment of the present disclosure.

[0036] Figure 6 and Figure 7 is a view showing a current collector having a structure in which the shape of the opening of the current collector is modified, compared to the current collector shown in Figure 5

[0037] Figure 8is a view showing a structure of a lower portion of a battery according to an embodiment of the disclosure.

[0038] Figure 9 is a view showing a battery pack according to an embodiment of the disclosure.

[0039] Figure 10 is a view showing a vehicle according to an embodiment of the disclosure. DETAILED DESCRIPTION

[0040] A preferred embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it is to be understood that the term used in the specification and the appended claims should not be construed as limited to general and dictionary meanings but interpreted in conjunction with the meaning of the term in the context of the relevant art and on the principles that the inventor is intended to use in the best possible manner for the optimal interpretation of the scope of the disclosure. Therefore, the description proposed herein merely is for illustrative purposes and is not intended to limit the scope of the disclosure and it is to be appreciated that other equivalents and modifications can be made thereto without departing from the scope of the disclosure.

[0041] Reference will be made to Figures 1 to 5 A battery 1 according to an embodiment of the disclosure will be described.

[0042] Figure 1 is a view showing a structure of an upper portion of a battery according to an embodiment of the disclosure, and Figure 2 is a view showing Figure 1 a battery in which a top of a battery case is open. Figure 3 is a view showing an electrode assembly according to an embodiment of the disclosure, and Figure 4 is a partial cross-sectional view of an electrode assembly according to an embodiment of the disclosure. Figure 5 is a view showing a current collector (first current collector) according to an embodiment of the disclosure.

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

[0044] The electrode assembly 10 can have a first uncoated portion 11 extending on a first surface. The electrode assembly 10 can be configured to include a first area A covered by the first uncoated portion 11 and a second area B not covered by the first uncoated portion 11. The battery case 20 can be configured to accommodate the electrode assembly 10 through an opening formed at one side. The current collector 30 can be configured to be disposed on the first surface of the electrode assembly 10 and electrically connected to the electrode assembly 10. The current collector 30 can have a current collector opening 30a formed in an area corresponding to the second area B of the electrode assembly 10.

[0045] As described above, the battery 1 of the present disclosure has the second area B not covered by the first uncoated portion 11 on the first surface of the electrode assembly 10, so when the electrolyte is injected, the electrolyte can be smoothly impregnated into the electrode assembly 10. In addition, since the battery 1 of the present disclosure has the structure in which the current collector 30 disposed on the first surface of the electrode assembly 10 has the current collector opening 30a formed in an area corresponding to the second area B, when the electrolyte is injected while the electrode assembly 10 and the current collector 30 are coupled, it is possible to prevent the impregnation characteristics of the electrolyte from being deteriorated due to the current collector 30.

[0046] On the other hand, when there is a problem such as a thermal event occurring inside the battery case 20 and / or an increase in internal pressure, the present disclosure can concentrate heat and / or pressure in the center of the electrode assembly 10 rather than the side of the battery case 20, thereby mitigating the risk of side cracking of the battery 1 and improving the use safety of the battery 1. That is, in the case of an increase in temperature and / or pressure inside the battery case 20 of the present disclosure, if heat and / or pressure act on the side of the battery case 20, the event can spread to the adjacent battery 1. In particular, since the flange portion 21 to be described later can be more vulnerable than other portions due to the elongation of the metal of the battery case 20, if the event is laterally expanded due to the cracking of the flange portion 21, the use safety of the battery 1 can be significantly deteriorated. The battery 1 of the present disclosure can be configured to discharge heat and / or pressure through an open area, i.e., the second area B, which is not covered by the uncoated portion among the portions of the electrode assembly 10, thereby preventing side cracking. On the other hand, the battery 1 of the present disclosure can be configured to discharge heat and / or pressure released through the second area B as described above through the current collector opening 30a, thereby maximizing the effect of preventing side cracking. In addition, if the battery 1 of the present disclosure is provided with the exhaust portion 41 described below, the pressure released through the second area B and / or the current collector opening 30a can be smoothly released to the outside of the battery case 20, thereby further improving the effect of preventing side cracking.

[0047] The electrode assembly 10 can have a structure wound around a central winding hole 10a formed in the core. The electrode assembly 10 can include a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode. The electrode assembly 10 can be formed by winding a laminate in which the first electrode, the first separator, and the second electrode are sequentially laminated.

[0048] The first electrode can have a first uncoated portion 11 formed at one end in the winding direction. The first uncoated portion 11 can be formed at one end of the first electrode constituting the electrode assembly 10. The first uncoated portion 11 can extend in the winding direction of the electrode assembly 10. The first uncoated portion 11 can be disposed on one surface of the electrode assembly 10, and for example, can extend in the upward direction of the electrode assembly 10.

[0049] The first uncoated portion 11 can be configured to be bent in the radial direction of the electrode assembly 10 so as to cover the first surface of the electrode assembly 10. For example, the first uncoated portion 11 can be bent toward the core along the radial direction of the electrode assembly 10. As described above, the area (i.e., the first area A) of the first surface of the electrode assembly 10 covered by the bent first uncoated portion 11 can serve to prevent the electrolyte from being impregnated into the elements of the electrode assembly 10 when the electrolyte is injected. Accordingly, by forming an area (i.e., the second area B) on the first surface of the electrode assembly 10 that is not partially covered by the first uncoated portion 11, the impregnation performance of the electrolyte can be improved. The second area B can be an area obtained by cutting at least a portion of the first uncoated portion 11 of the electrode assembly 10.

[0050] The second area B can be positioned more inward than the first area A. The second area B can be disposed between the periphery of the central winding hole 10a formed in the core of the electrode assembly 10 and a position spaced apart from the periphery by a predetermined distance outward in the radial direction of the electrode assembly 10. As described above, if the second area B configured not to be covered by the first uncoated portion 11 is located in an area adjacent to the core of the electrode assembly 10, a phenomenon in which the central winding hole 10a is covered by the bending of the first uncoated portion 11 can be prevented. In the case where the central winding hole 10a is covered by the first uncoated portion 11, the circulation of the electrolyte through the central winding hole 10a can be hindered. In addition, if the central winding hole 10a is covered by the first uncoated portion 11, there can be an obstacle to performing a welding member located at the outlet of the central winding hole 10a by irradiating a laser beam or inserting a welding tool through the inlet of the central winding hole 10a. Accordingly, it can be advantageous for the second area B to be positioned more inward than the first area A.

[0051] At least a portion of the first uncoated portion 11 may include a plurality of segments 11a divided along the winding direction of the electrode assembly 10. In this case, the plurality of segments 11a may be bent in the radial direction of the electrode assembly 10. If segments 11a are formed in the first uncoated portion 11 as described above, the first uncoated portion 11 can be easily bent, thereby preventing the first uncoated portion 11 from being damaged during the bending process.

[0052] Apart from Figures 1 to 3 In addition, it also refers to Figure 4 The first uncoated portion 11 may have a region formed at least partially along the radial direction of the electrode assembly 10, such that multiple layers overlap each other by bending therein. The electrode assembly 10 having a structure where the first uncoated portion 11 is bent in the direction toward the core may have a portion where the number of overlapping layers due to the bending of the first uncoated portion 11 gradually increases from the outer surface of the electrode assembly 10 toward the core, a portion where the number of overlapping layers reaches a certain value and remains there, and a portion where the number of overlapping layers gradually decreases. The portion with the largest number of overlapping layers in the first uncoated portion 11 will be defined as the maximum overlapping region M. The second region B may be positioned further inward than the maximum overlapping region M. The maximum overlapping region M may be used for connection with the current collector 30. The second region B may be positioned adjacent to the core, and therefore the second region B may be used as a region for injecting electrolyte.

[0053] The battery housing 20 may include a conductive metal. The battery housing 20 may be electrically connected to the electrode assembly 10. Electrolyte may be contained within the battery housing 20 together with the electrode assembly 10. The battery housing 20 may have a circumferentially recessed pressing edge portion 21 extending inward from its outer surface. The pressing edge portion 21 may be located adjacent to an opening in the battery housing 20. The pressing edge portion 21 may serve as a stop to prevent the electrode assembly 10 from ejecting from the battery housing 20. The pressing edge portion 21 may serve as a support portion for the battery cover 40. The battery housing 20 may have a rolled edge portion 22, which is formed to extend from the pressing edge portion 21 and bend to wrap around the edge of the battery cover 40.

[0054] Apart from Figures 1 to 4 In addition, it also refers to Figure 5 The current collector 30 of this disclosure can be electrically connected to the first uncoated portion 11 of the electrode assembly 10. The current collector 30 can be connected to the first uncoated portion 11 by welding. The current collector 30 can be connected to the first uncoated portion 11 within the aforementioned maximum overlap region M. As described above, if the current collector 30 and the electrode assembly 10 are connected to each other within the maximum overlap region M, the risk of damage to the electrode assembly 10 from laser irradiation for welding penetrating the first uncoated portion 11 can be minimized.

[0055] The current collector 30 can be electrically coupled to the battery case 20. The current collector 30 can be coupled to an inner surface of the battery case 20. The current collector 30 can be coupled to the flange portion 21 of the battery case 20. The current collector 30 can be coupled to the battery case 20 by welding.

[0056] The current collector 30 can include a first coupling portion 31 configured to be coupled to the first uncoated portion 11 and a second coupling portion 32 configured to be coupled to the battery case 20. The current collector 30 can include a base portion 33. The first coupling portion 31 can extend outward from the base portion 33 in a radial direction of the electrode assembly 10. The first coupling portion 31 can be coupled to the first uncoated portion 11 in the maximum overlap region M. A plurality of first coupling portions 31 can be provided. The plurality of first coupling portions 31 can be disposed to be spaced apart from each other in a circumferential direction of the base portion 33. The second coupling portion 32 can extend outward from the base portion 33 in the radial direction of the electrode assembly 10. The second coupling portion 32 can be coupled to the flange portion 21 of the battery case 20. A plurality of second coupling portions 32 can be provided. The plurality of second coupling portions 32 can be disposed to be spaced apart from each other in the circumferential direction of the base portion 33. The first coupling portion 31 and the second coupling portion 32 can be configured to be indirectly connected to each other through the base portion 33, rather than being directly connected to each other, thereby minimizing the effect of an impact applied to one of a coupling portion between the first coupling portion 31 and the electrode assembly 10 and a coupling portion between the second coupling portion 32 and the battery case 20.

[0057] The current collector opening 30a formed in the current collector 30 can be formed to penetrate the current collector 30. The current collector opening 30a can be positioned more inward than a weld W formed by welding the first coupling portion 31 and the first uncoated portion 11. Accordingly, the current collector opening 30a can be disposed in a region corresponding to the second region B positioned more inward than the maximum overlap region M.

[0058] Next, in addition to Figure 1 , the shape of the current collector opening 30a of the present disclosure will be described with reference to Figures 5 to 7 .

[0059] Figure 6 and Figure 7 are drawings showing a current collector having a structure in which the shape of the current collector opening is modified compared to the current collector shown in Figure 5 .

[0060] In addition to Figure 1 , with reference to Figures 5 to 7 , the current collector opening 30a can include a plurality of holes disposed to be spaced apart from each other in a region corresponding to the second region B. With reference to Figure 5 , the holes can be substantially circular, as shown in Figure 5 . With reference toFigure 6 The current collector opening 30a can include a plurality of slits extending in the circumferential direction of the electrode assembly 10 in a region corresponding to the second region B.

[0061] The current collector 30 of the present disclosure can have a current collector hole 30b formed substantially at the center. Referring to Figure 7 The current collector opening 30a can be formed by expanding the current collector hole 30b. That is, the current collector opening 30a can correspond to a region overlapping the second region B in the entire region of the current collector hole 30b.

[0062] In addition, the current collector hole 30b can be disposed in a region corresponding to the center-wound hole 10a of the electrode assembly 10. The current collector hole 30b can be configured to have a larger diameter or width than the center-wound hole 10a. The center-wound hole 10a can be located within the current collector hole 30b. In this case, injection of the electrolyte solution through the center-wound hole 10a can be prevented from being blocked by the current collector 30. In addition, when the internal pressure of the battery 1 increases, the pressure can be smoothly dissipated through the exhaust portion 41 of the battery cover 40, which will be described later.

[0063] Referring to Figure 1 The battery cover 40 can be configured to cover the opening of the battery case 20. The battery cover 40 can be provided with an exhaust portion 41 configured to be broken when the internal pressure of the battery case 20 exceeds a reference exhaust pressure. The exhaust portion 41 can be a region configured to be more fragile than the surrounding region of the battery cover 40. For example, the exhaust portion 41 can be a region having a smaller thickness than the remaining region of the battery cover 40. The exhaust portion 41 can be configured to extend to form a closed loop around the approximate center of the battery cover 40. The exhaust portion 41 can be formed continuously or discontinuously. As described above, in the case where the battery 1 of the present disclosure is provided with the exhaust portion 41, even if an abnormality occurs in the battery 1, the internal pressure of the battery 1 can be prevented from increasing above a certain level.

[0064] In addition, the battery 1 of the present disclosure can include a first gasket G1 interposed between the battery cover 40 and the battery case 20 in a region covered by the battery cover 40. The first gasket G can reinforce the sealing force in the region covered by the battery cover 40.

[0065] Next, the lower structure of the battery 1 according to the embodiment of the present disclosure will be described with reference to Figure 8

[0066] Figure 8 is a view illustrating the lower structure of a battery according to an embodiment of the present disclosure.

[0067] Referring to Figure 8 ​The battery 1 can include a battery terminal 50. The battery terminal 50 can be electrically coupled to the electrode assembly 10. The battery terminal 50 can be connected to the second electrode of the electrode assembly 10. The battery terminal 50 can be electrically insulated from the battery case 20. A second gasket G2 can be disposed between the battery terminal 50 and the battery case 20. The second gasket G2 can have an electrical insulation property.

[0068] A portion of the battery terminal 50 can be inserted into the battery case 20 through the closed portion 20a disposed on the opposite side of the opening of the battery case 20. As described above, in the case where the battery terminal 50 is disposed on the closed portion 20a of the battery case 20, the closed portion 20a of the battery case 20 can function as the first electrode terminal T1, and the battery terminal 50 can function as the second electrode terminal T2 of the battery 1.

[0069] Accordingly, the battery 1 of the present disclosure can have both a positive electrode terminal and a negative electrode terminal disposed on the closed portion of the battery case 20. As described above, in the case where both the positive electrode terminal and the negative electrode terminal are disposed on one side of the battery 1, electrical connection of a plurality of batteries 1 can become easier, and the electrical connection structure can be simplified, thereby improving the energy density.

[0070] The battery 1 can include a current collector (second current collector) 60 configured to electrically connect the battery terminal 50 and the electrode assembly 10. The current collector 60 can be electrically connected to the second electrode. The current collector 60 can be electrically coupled to a second uncoated portion 12 disposed on the second electrode. The second uncoated portion 12 can extend from one end of the second electrode in the winding direction of the electrode assembly 10. The second uncoated portion 12 can be disposed on the side of the electrode assembly 10 opposite to the side on which the first uncoated portion 11 is disposed, and can extend in the downward direction of the electrode assembly 10.

[0071] The current collector 60 can be electrically coupled to the battery terminal 50. For example, a laser beam or a tool for welding can be irradiated or inserted from the opening of the battery case 20 through the central winding hole 10a of the electrode assembly 10, thereby welding the current collector 60 and the battery terminal 50.

[0072] In the case where the battery 1 of the present disclosure has the current collector 60, an insulator 70 can be interposed between the current collector 60 and the closed portion 20a of the battery case 20. The insulator 70 can prevent contact between the current collector 60 and the battery case 20 configured to have different polarities from each other.

[0073] Next, a battery pack 3 according to an embodiment of the present disclosure will be described with reference to Figure 9 FIG. 1 is a view illustrating a battery pack according to an embodiment of the present disclosure. Figure 9 FIG. 1 is a view illustrating a battery pack according to an embodiment of the present disclosure.

[0074] Referring to FIG. 1, a battery pack 3 according to an embodiment of the present disclosure can include a plurality of batteries 1. The plurality of batteries 1 can be electrically connected to each other in series or in parallel. Figure 9The battery pack 3 according to the embodiment of the present disclosure can include at least one battery 1 of the present disclosure as described above. The battery 1 can be stored in the battery pack case 2. The battery pack 3 can include components for electrical connection of the battery 1 and / or a BMS (Battery Management System) configured to control charging and discharging of the battery 1.

[0075] Next, a vehicle 5 according to the embodiment of the present disclosure will be described with reference to Figure 10 The vehicle 5 according to the embodiment of the present disclosure will be described. Figure 10 is a view showing a vehicle according to the embodiment of the present disclosure.

[0076] With reference to Figure 10 The vehicle 5 according to the embodiment of the present disclosure includes at least one battery pack 3. The vehicle 5 can be configured to operate by power supplied from the battery pack 3. The vehicle 5 can be, for example, a hybrid electric vehicle HEV or an electric vehicle EV.

[0077] As described above, although the present disclosure has been described with reference to limited embodiments and drawings, the present disclosure is not limited thereto, and various modifications and changes can be made by those skilled in the art within the technical idea of the present disclosure and the equivalent scope of the claims to be described below.

[0078] [Legend of Reference Numerals]

[0079] 1: battery

[0080] 2: battery pack case

[0081] 3: battery pack

[0082] 5: vehicle

[0083] 10: electrode assembly

[0084] 10a: central winding hole

[0085] 11: first uncoated portion

[0086] 11a: section

[0087] 12: second uncoated portion

[0088] A: first region

[0089] B: second region

[0090] 20: battery case

[0091] 20a: closed portion

[0092] T2: second electrode terminal

[0093] 21: edge pressing portion

[0094] 22: Wrapping edge portion

[0095] 30: Current collector (first current collector)

[0096] 30a: Current collector opening

[0097] 30b: Current collector hole

[0098] 31: First coupling portion

[0099] 32: Second coupling portion

[0100] 33: Base portion

[0101] 40: Battery cover

[0102] 41: Exhaust portion

[0103] G1: First gasket

[0104] 50: Battery terminal

[0105] T1: First electrode terminal

[0106] G2: Second gasket

[0107] 60: Current collector (second current collector)

[0108] 70: Insulator

Claims

1. A battery, the battery comprising: An electrode assembly having a first uncoated portion extending on a first surface, the first surface including a first region covered by the first uncoated portion and a second region not covered by the first uncoated portion; A battery housing configured to receive the electrode assembly through an opening formed on one side; as well as A current collector is disposed on the first surface of the electrode assembly for electrical connection to the electrode assembly, and has a current collector opening formed in a region corresponding to the second region of the electrode assembly.

2. The battery according to claim 1, wherein, The first uncoated portion is configured to bend along the radial direction of the electrode assembly to cover the first surface of the electrode assembly.

3. The battery according to claim 1, wherein, The second region is positioned further inward than the first region.

4. The battery according to claim 1, wherein, The second region is located between the periphery of the central winding hole formed in the core of the electrode assembly and a position spaced outward from the periphery along the radial direction of the electrode assembly by a predetermined distance.

5. The battery according to claim 2, wherein, The first uncoated portion is configured such that an overlapping region is formed at least partially along the radial direction of the electrode assembly, in which multiple layers overlap each other by bending.

6. The battery according to claim 5, wherein, The electrode assembly includes a maximum overlap region, in which the number of overlapping layers in the first uncoated portion is the largest.

7. The battery according to claim 6, wherein, The second region is positioned further inward than the maximum overlapping region.

8. The battery according to claim 2, wherein, The current collector is electrically connected to the first uncoated portion.

9. The battery according to claim 1, wherein, The current collector is electrically connected to the battery casing.

10. The battery according to claim 1, wherein, The current collector opening includes a plurality of holes, which are spaced apart from each other in a region corresponding to the second region.

11. The battery according to claim 1, wherein, The current collector opening includes a plurality of slits extending in the circumferential direction of the electrode assembly in the region corresponding to the second region.

12. The battery according to claim 1, wherein, The current collector opening has a current collector hole, which is formed at a position corresponding to the central winding hole of the electrode assembly.

13. The battery according to claim 12, wherein, The current collector opening is formed by expanding the current collector orifice.

14. A battery pack comprising a battery according to any one of claims 1 to 13.

15. A vehicle comprising the battery pack according to claim 14.

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