Battery, and battery set and vehicle including the same

Description

1 / 18 BATTERY, AND BATTERY SET AND VEHICLE INCLUDING THE SAME TECHNICAL FIELD

[0001] The present invention relates to a battery, and a battery pack and a vehicle that includes the same.

[0002] This request is based on and claims priority from the Request of Korean Patent Number 10-2023-0156709, filed on November 13, 2023 with the Korean Intellectual Property Office, the invention of which is incorporated herein by reference in its entirety.

[0003] This request is based on and claims priority from the Request of Korean Patent Number 10-2024-0062722, filed on May 13, 2024 with the Korean Intellectual Property Office, the invention of which is incorporated herein by reference in its entirety. BACKGROUND OF THE TECHNIQUE

[0004] Fuse devices commonly used in secondary batteries include PTC (positive temperature coefficient) thermistors, TCOs (thermal circuit breakers), and similar devices. However, PTC thermistors or TCOs have a disadvantage in that their own resistance increases as they are repeatedly operated, thereby increasing the total resistance of the circuit.

[0005] Furthermore, all the aforementioned devices are operated by the heat generated due to overcurrent. That is, the aforementioned devices are operated to cut off the current flow only when overcurrent occurs in the circuit current path due to overload or similar, and the temperature increases accordingly.

[0006] Therefore, the aforementioned devices can operate to block overcurrent only after a situation in which safety is threatened due to heat generation, and they are incapable of blocking overcurrent immediately after it occurs. Petition 870250087263, dated 09 / 26 / 2025, page 9 / 46 2 / 18 of a cause that could increase the temperature. As described above, when internal pressure increases due to abnormal temperature increases within the secondary battery, if the overcurrent is not blocked in a timely manner, safety problems such as fire or explosion may occur.

[0007] Furthermore, since the aforementioned devices simply operate depending on temperature, they are difficult to use in secondary batteries that exhibit high efficiency, such as battery packs used in vehicles. That is, battery packs for vehicles require a high C-rate, leading to a large amount of heat generated, but devices such as PTC (positive temperature coefficient) thermistors, TCOs (thermal circuit breakers) and thermal fuses have the problem in that they may operate too early when placed in high temperature environments.

[0008] Therefore, it is necessary to provide a secondary battery that is capable of being used in environments where high current flows and that has a structure capable of cutting off the current before the temperature rises to a level that could cause a safety problem when an event (for example, an increase in the internal pressure of the secondary battery) occurs that could cause the temperature to rise. INVENTION TECHNICAL PROBLEM

[0009] The present invention is designed to solve the problems of the relevant art and therefore aims to allow a quick disconnection of an electrical connection in the event that an overcurrent exceeding a standard value occurs in a battery.

[0010] However, the technical problems that the present invention seeks to solve are not limited to the problems mentioned above, Petition 870250087263, dated 09 / 26 / 2025, page 10 / 46 3 / 18 and other problems not mentioned above will be clearly understood by those skilled in the art of the invention described below. TECHNICAL SOLUTION

[0011] In one aspect of the present invention, a battery is provided comprising: an 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 through a closed portion provided on the opposite side of the battery housing opening; and a current collector comprising 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 to each other, and configured such that at least a portion of an area adjacent to the second coupling portion has a reduced cross-sectional area.

[0012] The bridge portion may include a first area configured to be connected to the second coupling portion and a second area provided at a predetermined distance from the second coupling portion in a direction away from the first area.

[0013] The width of the first area can be set to be smaller than the width of the second area.

[0014] A distance from the center of the second coupling portion to the first area can be configured to be 0.5 times the radius of the current collector or less.

[0015] The bridge portion can be configured so that its width gradually decreases from the second area towards the first area. Petition 870250087263, dated 09 / 26 / 2025, page 11 / 46 4 / 18

[0016] The first area may include a notched portion formed on at least one side of the bridge portion in a width direction.

[0017] A bridge portion width can be set to be constant in an area from the second area to the notched portion.

[0018] The first coupling portion and the second coupling portion can be spaced from each other in a radial direction of the electrode array.

[0019] The current collector may have a slot line configured to separate the first coupling portion and the second coupling portion from each other.

[0020] The current collector may include an edge positioned on an outer circumference of the first coupling portion and the second coupling portion, and the bridge portion may be configured to connect the edge and the second coupling portion.

[0021] In another aspect of the present invention, a battery pack is provided which includes a battery according to the present invention.

[0022] In another aspect of the present invention, a vehicle is provided that includes a battery pack according to the present invention. ADVANTAGEOUS EFFECTS

[0023] According to one aspect of the present invention, it is possible to quickly cut off the electrical connection when an overcurrent exceeding a reference value occurs in a battery, thereby ensuring safety in the use of the battery.

[0024] In addition, the present invention may have several other effects, these will be described in the respective embodiments, or the description of effects that can be easily inferred by those skilled in the art will be omitted. Petition 870250087263, dated 09 / 26 / 2025, p. 12 / 46 5 / 18 BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings illustrate a preferred embodiment of the present invention and, together with the invention above, serve to provide a better understanding of the technical features of the present invention and, therefore, the present invention is not interpreted as being limited to the drawing.

[0026] Figure 1 is a drawing illustrating the structure of an upper portion of a battery, according to an embodiment of the present invention.

[0027] Figure 2 is a drawing illustrating a current collector (first current collector) included in a battery, according to an embodiment of the present invention.

[0028] Figure 3 is a drawing illustrating a current collector (first current collector) included in a battery, according to another embodiment of the present invention.

[0029] Figure 4 is a CT image illustrating a state in which a first portion is melted when an overcurrent occurs in a current collector (first current collector) included in a battery, according to an embodiment of the present invention.

[0030] Figure 5 is a drawing illustrating a temperature distribution that depends on the position of a current collector (first current collector) included in a battery, according to an embodiment of the present invention.

[0031] Figure 6 is a temperature graph that depends on the position of the current collector (first current collector) in Figure 5.

[0032] Figure 7 is a drawing illustrating the structure of a lower portion of a battery, according to an embodiment of the present invention.

[0033] Figure 8 is a drawing illustrating a battery assembly, according to an embodiment of the present invention. Petition 870250087263, dated 09 / 26 / 2025, page 13 / 46 6 / 18

[0034] Figure 9 is a drawing illustrating a vehicle according to an embodiment of the present invention. BEST WAY

[0035] Hereafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms used in the specification and appended claims should not be interpreted as limited to general and dictionary meanings, but interpreted based on the meanings and concepts that correspond to the technical aspects of the present invention, based on the principle that the inventor is permitted to define the terms appropriately for the best explanation.

[0036] Therefore, the description proposed here is only a preferable example for illustrative purposes only, and is not intended to limit the scope of the invention; thus, it should be understood that other equivalents and modifications can be made to this without departing from the scope of the invention.

[0037] Furthermore, the present invention may include several embodiments. Redundant descriptions of substantially identical or similar configurations will be omitted from the respective embodiments, and a description will be made based on the differences between them.

[0038] A battery 1 according to an embodiment of the present invention, will be described with reference to Figures 1 to 4.

[0039] Figure 1 is a drawing illustrating the structure of an upper portion of a battery, according to one embodiment of the present invention. Figure 2 is a drawing illustrating a current collector (first current collector) included in a battery, according to one embodiment of the present invention. Figure 3 is a drawing illustrating a current collector (first current collector) included in a battery, according to another embodiment of the present invention. Petition 870250087263, dated 09 / 26 / 2025, page 14 / 46 7 / 18 Furthermore, Figure 4 is a CT image illustrating a state in which a first portion is melted when an overcurrent occurs in a current collector (first current collector) included in a battery, according to an embodiment of the present invention.

[0040] Referring to Figures 1 to 3, a battery 1 according to an embodiment of the present invention may include an electrode assembly 10, a battery housing 20, a battery terminal 30 and a current collector (first current collector) 40. The battery 1 may be a secondary battery configured to be rechargeable. The battery 1 may be, for example, a cylindrical battery.

[0041] The electrode assembly 10 may 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 may be configured in a form in which a laminate, which includes the first electrode, the second electrode, and the separator, is wound in one direction. In the case where the electrode assembly 10 is configured in a wound form, a central winding hole 10a may be formed in an area that is a winding center.

[0042] The first electrode may include a first uncoated area 11, which is an area where an active electrode material is not applied. The first uncoated area 11 may extend from one end of the first electrode in the winding direction of the electrode assembly 10. Consequently, the first uncoated area 11 may be provided on a first surface that is approximately perpendicular to the outer surface of the electrode assembly 10.

[0043] The second electrode may include a second uncoated area 12, which is an area where an active electrode material is not applied (see Figure 6). The second uncoated area 12 may extend from one end of the second electrode in the winding direction of the Petition 870250087263, dated 09 / 26 / 2025, page 15 / 46 8 / 18 electrode assembly 10. Therefore, the second uncoated area 12 can be provided on a second surface (opposite the first surface) that is approximately perpendicular to the outer surface of the electrode assembly 10.

[0044] Although not specifically illustrated in the drawing, the first uncoated area 11 and / or the second uncoated area 12 may include a plurality of segments formed to be split in the winding direction of the electrode assembly 10. These segments may be formed by notches in the first uncoated area 11 and / or the second uncoated area 12 to a predetermined depth. The plurality of segments may be folded approximately in the radial direction of the electrode assembly 10. In this case, some of the segments adjacent to each other in the radial direction may overlap each other.

[0045] The battery housing 20 can be configured to receive the electrode assembly 10 through an opening formed on one side thereof. The battery housing 20 may have a closed portion formed on the opposite side of the opening. The battery housing 20 may include a conductive metal. The battery housing 20 may be electrically connected to the second electrode of the electrode assembly 10.

[0046] Battery terminal 30 can be configured to be electrically connected to electrode assembly 10 through the closed portion formed on the opposite side of the battery housing opening 20. Battery terminal 30 can be electrically connected, for example, to the first electrode of electrode assembly 10. In this case, battery terminal 30 can function as a first battery terminal 1. Battery terminal 30 and battery housing 20 can have opposite polarities, and in this case, a first sealing member G1 can be provided between battery housing 20 and terminal 30. Petition 870250087263, dated 09 / 26 / 2025, page 16 / 46 9 / 18 battery 30 to prevent contact between these components and ensure the sealing of the battery housing 20.

[0047] The battery terminal 30 may include a first portion 31 and a second portion 32. The first portion 31 may be configured to be electrically coupled to the current collector 40 on the inside of the battery housing 20. The first portion 31 may be provided in a position corresponding to the central winding hole 10a of the electrode assembly 10. The second portion 32 may be exposed to the outside of the battery housing 20. The second portion 32 may be located approximately in the center of the closed portion of the battery housing 20.

[0048] Battery terminal 30 may include a third portion 33 provided on the outside of the first portion 31. The third portion 33 may be riveted towards the closed portion of the battery housing 20 to secure battery terminal 30 to battery housing 20.

[0049] Current collector 40 can be configured to electrically connect battery terminal 30 and electrode assembly 10. Current collector 40 can be electrically connected to the first electrode of electrode assembly 10.

[0050] An insulator (IS) may be interposed between the current collector 40 and the inner surface of the closed portion of the battery housing 20 to prevent contact between the battery housing 20 and the current collector 40, which have opposite polarities.

[0051] The current collector 40 can be arranged on the first surface of the electrode assembly 10. Referring to Figures 2 and 3, the current collector 40 can include a first coupling portion 41, a second coupling portion 42, and a bridging portion 43.

[0052] The first coupling portion 41 can be configured to be electrically coupled to the electrode assembly 10. The first Petition 870250087263, dated 09 / 26 / 2025, page 17 / 46 10 / 18 coupling portion 41 can be coupled to the first uncoated area 11 of the electrode assembly 10. The first coupling portion 41 can be coupled to a coupling surface formed by folding the first uncoated area 11. At least one portion of the first coupling portion 41 can be coupled to the first uncoated area 11 in an area where the number of overlapping layers of the segments of the first uncoated area 11 is maximum.

[0053] The second coupling portion 42 can be electrically coupled to 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 a welding tool inserted through the central winding hole 10a of the electrode assembly 10 or by a laser beam irradiated through the central winding hole 10a.

[0054] The bridge portion 43 can be configured to electrically connect the first coupling portion 41 and the second coupling portion 42. A plurality of the first coupling portions 41 can be provided along the circumferential direction of battery 1. In this case, a plurality of the bridge portions 43 can also be provided.

[0055] Specifically, referring to Figures 2 and 3, the bridge portion 43 can be configured so that at least a portion of the area adjacent to the second coupling portion 42 has a reduced cross-sectional area. Specifically, as shown in Figure 4, the portion of the bridge portion 43 where the cross-sectional area is reduced can be broken when an overcurrent exceeding a reference value occurs in battery 1.

[0056] According to the implemented configuration of the present invention, when battery 1 is abnormal, the current collector 40 Petition 870250087263, dated 09 / 26 / 2025, page 18 / 46 11 / 18 may fuse and short-circuit without ignition. Furthermore, when an overcurrent occurs in battery 1, the overcurrent can be quickly blocked by inducing a rapid breakdown of the collector current 40 itself. Consequently, the safety of battery 1 can be ensured.

[0057] Specifically, the portion of the bridge portion 43 where the cross-sectional area is reduced can be provided approximately in a portion where the second coupling portion 42 and the bridge portion 43 are connected. More specifically, the bridge 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. Furthermore, the first area A1 can be configured to break when an overcurrent exceeding a reference value occurs in battery 1.

[0058] 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 further inward than the second area A2 in the radial direction.

[0059] According to the implemented configuration of the present invention, as the first area A1 that breaks when an overcurrent occurs in battery 1 is provided in a connection portion between the second coupling portion 42 and the bridge portion 43 of the current collector 40, the resistance can be partially increased in the path of a large current to or from the battery terminal 30, thereby more effectively inducing a breakdown of the current collector 40.

[0060] 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 indicate a portion where the cross-sectional area of Petition 870250087263, dated 09 / 26 / 2025, page 19 / 46 12 / 18 portion of bridge 43 is reduced. Consequently, when an overcurrent occurs in battery 1, the first area A1, which has a relatively small cross-sectional area, can be quickly broken to rapidly block the overcurrent.

[0061] Next, a preferred position of the first area A1 of the present invention will be described with reference to Figures 5 and 6. Figure 5 is a drawing illustrating a temperature distribution that depends on the position of a current collector (first current collector) included in a battery according to an embodiment of the present invention, and Figure 6 is a graph of temperature that depends on the position of the current collector (first current collector) in Figure 5.

[0062] When an overcurrent occurs in battery 1, heat can move from the center of the second coupling portion 42 outwards in the radial direction, for example, to the bridge portion 43. In this case, referring to Figure 5 and Figure 6, the temperature of the area (indicated as T1 in Figure 5) adjacent to the second coupling portion 42 may be the highest, which is approximately 650 degrees C or higher, in the bridge portion 43. Specifically, the temperature of the area where the second coupling portion 42 and the bridge portion 43 are connected may be the highest.

[0063] Consequently, the first area A1 may be located closer to the inside than to the outside in the radial direction of the current collector 40. For example, as in the embodiment illustrated 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 bridge portion 43 may be configured to be 0.5 times the radius R of the current collector 40 or less.

[0064] According to the implemented configuration of the present invention, when an abnormal situation occurs in battery 1, the portion Petition 870250087263, dated 09 / 26 / 2025, page 20 / 46 The 13 / 18 connection of the second coupling portion 42 and the bridge portion 43, where heat is most concentrated in the current collector 40, may break. Therefore, the electrical connection of battery 1 can be quickly cut, thereby ensuring safety in the use of battery 1.

[0065] Next, various embodiments of the bridge portion 43 of the current collector 40 of the present invention will be described with reference to Figures 2 and 3.

[0066] The bridge portion 43 may include a portion whose width w decreases as it approaches the second coupling portion 42. As an example, as in the embodiment illustrated in Figure 2, the bridge portion 43 may be configured so that the width w gradually decreases from the second area A2 to the first area A1. That is, the bridge portion 43 may be configured in a trapezoidal shape.

[0067] In this case, the width of the first area A1 can be approximately 0.5 mm to 6.0 mm. Alternatively, the width of the first area A1 can be approximately 1 mm to 4 mm. Alternatively, the width of the first area A1 can be approximately 2 mm to 4 mm. Alternatively, the width of the first area A1 can be approximately 1.5 mm to 3.5 mm. Alternatively, the width of the first area A1 can be approximately 1.5 mm to 2 mm.

[0068] In addition, the width of the second area A2 can be approximately 0.5 mm to 6.0 mm. Alternatively, the width of the second area A2 can be approximately 2 mm to 5.5 mm. Alternatively, the width of the second area A2 can be approximately 2.5 mm to 5 mm. Alternatively, the width of the second area A2 can be approximately 3 mm to 4.5 mm.

[0069] As another modality, as in the modality illustrated in Figure 3, the first area A1 may include an indented portion N. A Petition 870250087263, dated 09 / 26 / 2025, page 21 / 46 14 / 18 notched portion N can be formed on at least one side of bridge portion 43 in the width direction. The notched portion N can be configured as a recessed groove on at least one side of bridge portion 43 in the width direction, in a portion where bridge portion 43 and the second coupling portion 42 are connected. For example, as illustrated in Figure 3, the notched portions N can be formed to face each other on both sides of bridge portion 43 in the width direction.

[0070] The notched portion N can be configured, for example, in an approximately rounded shape. The notched portion N can be configured, for example, in an approximately semicircular shape. However, the notched portion N is not limited to the exemplary shapes described above, and any other shape capable of reducing the cross-sectional area of ​​the current path and increasing the resistance can be applied.

[0071] The notched portion N can be formed in an area adjacent to the second coupling portion 42, as described above. As the notched portion N is formed, the width of the first area A1 can become smaller than the width of the second area A2. According to the implemented configuration of the present invention, when an overcurrent exceeding a reference value occurs in battery 1, a disruption of the current collector 40 can be induced in the area between the notched portions N. Therefore, the overcurrent can be quickly blocked.

[0072] Furthermore, the width w of bridge portion 43 can be set to be constant in the area of ​​the second area A2 up to the notched portion N. For example, the width w of bridge portion 43 can be approximately 3 mm.

[0073] Referring to Figures 2 and 3, the current collector 40 can be Petition 870250087263, dated 09 / 26 / 2025, page 22 / 46 15 / 18 configured so that the first coupling portion 41 and the second coupling portion 42 described above are spaced from each other in the radial direction of the electrode assembly 10. That is, an empty space can be formed between the first coupling portion 41 and the second coupling portion 42 in the radial direction.

[0074] Specifically, the current collector 40 may have a slot line 44. The slot line 44 may be formed by passing through the current collector 40. That is, the slot line 44 may be formed by passing through the current collector 40 configured as an approximately circular plate. The first coupling portion 41, the second coupling portion 42, and the bridge portion 43 of the current collector 40 may be formed by the slot line 44. In this case, the first coupling portion 41 and the second coupling portion 42 may be spaced radially from each other by the slot line 44. Furthermore, the first coupling portion 41 and the bridge portion 43 may be spaced circumferentially from each other by the slot line 44.

[0075] As described above, when applying a structure in which the respective components of the current collector 40 are distinguished by the slot line 44, complex processes for forming the respective components, i.e., the first coupling portion 41, the second coupling portion 42 and the bridge portion 43, are not required, and the current collector 40 can be manufactured relatively easily simply by forming cutting lines on a metal plate.

[0076] Furthermore, when forming the slot line 44, the notch can also be executed to form the trapezoidal shape of the bridge portion 43 shown in Figure 2 or the notched portion N of the bridge portion 43 shown in Figure 3. As a result, as the pro Petition 870250087263, dated 09 / 26 / 2025, page 23 / 46 16 / 18 The manufacturing process of the current collector 40 is simplified, productivity or processability can be improved when manufacturing battery 1.

[0077] In addition, the current collector 40 may have an edge 45 located on the outer circumference of the first coupling portion 41 and the second coupling portion 42. In this case, the bridge portion 43 may be configured to connect the edge 45 and the second coupling portion 42. Furthermore, in this case, the second area A2 may indicate a portion where the bridge portion 43 and the edge 45 are connected.

[0078] In the case where the first coupling portion 41 and the second coupling portion 42 are indirectly connected via edge 45, as shown in the implemented configuration of the present invention, instead of being directly connected to each other, the impact applied to battery 1 can be dispersed. That is, the impact applied to the weld of the first coupling portion 41 can be minimized from being transferred to the weld of the second coupling portion 42, and the impact applied to the weld of the second coupling portion 42 can also be minimized from being transferred to the first coupling portion 41.

[0079] Figure 7 is a drawing illustrating the structure of a lower portion of a battery, according to an embodiment of the present invention.

[0080] Referring to Figure 7, a battery 1 according to an embodiment of the present invention may include a current collector (second current collector) 50. The current collector 50 may be configured to electrically connect the electrode assembly 10 and the battery housing 20. The current collector 50 may be electrically connected to the second electrode of the electrode assembly 10. The current collector 50 may be electrically coupled to the second non-electrical area. Petition 870250087263, dated 09 / 26 / 2025, page 24 / 46 17 / 18 coated 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 housing 20. The current collector 50 can be electrically coupled to a groove portion 21 formed by the pressure of the outer circumferential surface of the battery housing 20.

[0081] Battery 1 may include a cover 60. The cover 60 may be configured to close the opening of the battery housing 20. The cover 60 may be secured by a crimping portion 22 configured to extend and bend from the crimping portion 21 of the battery housing 20 to encircle the edge of the cover 60. A sealing member (second sealing member) G2 may be interposed between the cover 60 and the inner surface of the battery housing 20. The cover 60 may include a vent portion 61 configured to be weaker than the remaining area. The vent portion 61 may be configured to partially reduce the thickness of the cover 60. The vent portion 61 may be configured to rupture when the internal pressure of battery 1 increases to a predetermined pressure or higher.

[0082] Figure 8 is a drawing illustrating a battery assembly according to an embodiment of the present invention.

[0083] Referring to Figure 8, a battery assembly 3 according to an embodiment of the present invention may include a battery 1, according to an embodiment of the present invention, and an assembly housing 2 that accommodates the battery 1. A plurality of batteries 1 may be provided, and the plurality of batteries 1 may be electrically connected to each other. The battery 1 of the present invention may be configured so that the battery terminal 30 and the closed portion of the battery housing 20 function as a first electrode terminal and a second electrode terminal, respectively. Therefore, a plurality of batteries 1 may be arranged in the assembly housing. Petition 870250087263, dated 09 / 26 / 2025, p. 25 / 46 18 / 18 together 2 so that terminals 30 of all batteries 1 are pointing upwards, so that the electrical connection can be made on top of batteries 1.

[0084] Figure 9 is a drawing illustrating a vehicle according to an embodiment of the present invention.

[0085] Referring to Figure 9, a vehicle 5 according to an embodiment of the present invention may include a battery pack 3 according to an embodiment of the present invention. The vehicle 5 may be configured to operate on power provided by the battery pack 3. The vehicle 5 may be, for example, an electric vehicle or a hybrid vehicle.

[0086] As described above, although the present invention has been described with reference to limited embodiments and designs, the present invention is not limited thereto, and various modifications and variations are possible within the technical idea of ​​the present invention and the scope of equivalence of the claims to be described below by those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be interpreted by the claims described to encompass various modifications described above. Petition 870250087263, dated 09 / 26 / 2025, p. 26 / 46

Claims

1 / 2 CLAIMS 1. Battery, characterized in that it comprises: an 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 through a closed portion provided on the opposite side of the battery housing opening; and a current collector comprising 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 to each other, and configured such that at least a portion of an area adjacent to the second coupling portion has a reduced cross-sectional area.

2. Battery, according to claim 1, characterized in that the bridge portion comprises a first area configured to be connected to the second coupling portion and a second area provided at a predetermined distance from the second coupling portion in a direction away from the first area.

3. Battery, according to claim 2, characterized in that the width of the first area is configured to be smaller than the width of the second area.

4. Battery, according to claim 2, characterized in that a distance from the center of the second coupling portion to the first area is configured to be 0.5 times the radius of the current collector or less. Petition 870250087263, dated 09 / 26 / 2025, page 27 / 46 2 / 2 5. Battery, according to claim 2, characterized in that the bridge portion is configured so that its width gradually decreases from the second area towards the first area.

6. Battery, according to claim 2, characterized in that the first area comprises a notched portion formed on at least one side of the bridge portion in a width direction.

7. Battery, according to claim 6, characterized in that the width of the bridge portion is configured to be constant in an area from the second area to the notched portion.

8. Battery according to claim 1, characterized in that the first coupling portion and the second coupling portion are spaced from each other in a radial direction of the electrode assembly.

9. Battery according to claim 8, characterized in that the current collector has a slot line configured to separate the first coupling portion and the second coupling portion from each other.

10. Battery, according to claim 8, characterized in that the current collector comprises an edge positioned on an outer circumference of the first coupling portion and the second coupling portion, and wherein the bridge portion is configured to connect the edge and the second coupling portion.

11. Battery pack, characterized in that it comprises a battery, as defined in any one of claims 1 to 10.

12. Vehicle, characterized in that it comprises a battery, as defined in any one of claims 1 to 10. Petition 870250087263, dated 09 / 26 / 2025, p. 28 / 46

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