Secondary battery and method of manufacturing secondary battery

Abstract

This disclosure relates to secondary batteries and methods of manufacturing secondary batteries. A secondary battery according to an embodiment includes: a first electrode contact connected to a first electrode; a second electrode contact connected to a second electrode; a current collector assembly including a current collector holder formed of an insulating material, a first current collector connected to an upper portion of a first side of the current collector holder and having a first slit and a first connecting terminal, and a second current collector connected to an upper portion of a second side of the current collector holder and having a second slit and a second connecting terminal; and a cover assembly including a first electrode terminal and a second electrode terminal electrically connected to the first current collector and the second current collector, respectively. The first electrode contact is inserted into the first slit and connected to the upper surface of the first current collector.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 10-2025-0010079, filed on January 23, 2025, the disclosure of which is incorporated herein by reference in its entirety.

[0002] This disclosure relates to secondary batteries and methods for manufacturing secondary batteries. Background Technology

[0003] Recently, with the rapid increase in demand for portable electronic devices such as laptops, video cameras and mobile phones, and the active promotion of the development of electric vehicles, energy storage batteries, robots, satellites, etc., high-performance rechargeable and rechargeable batteries have been studied in depth.

[0004] In secondary batteries, lithium-ion batteries primarily use lithium-based oxides and carbon materials as the positive and negative electrode active materials, respectively. Furthermore, a lithium-ion secondary battery includes: a positive electrode plate and a negative electrode plate, on which positive and negative electrode active materials are applied respectively; an electrode assembly, wherein the positive and negative electrode plates are positioned by means of a spacer inserted between them; and an outer casing that seals and houses the electrode assembly and the electrolyte together.

[0005] Lithium-ion secondary batteries can be classified into can-type and pouch-type batteries based on the shape of their battery casing. In can-type batteries, the electrode assembly is embedded in a metal can, while in pouch-type batteries, the electrode assembly is embedded in a pouch formed of aluminum laminates. Can-type batteries can also be classified into cylindrical and prismatic batteries based on the shape of their metal casing.

[0006] In the manufacture of secondary batteries, a process is performed to weld multiple electrode contacts, which are connected to electrode plates, to current collectors. The current collectors to which the electrode contacts are welded are then connected to the terminals of the cover assembly.

[0007] To connect multiple electrode contacts to the current collector, the electrode contacts are connected to either the lower or upper surface of the current collector. However, when the electrode contacts are connected to the lower surface of the current collector, the distance between the electrode assembly and the current collector increases, thereby reducing the energy density of the secondary battery. When the electrode contacts are connected to the upper surface of the current collector, the length of the electrode contacts increases, thereby increasing the resistance.

[0008] In addition, the positive and negative current collectors, each connected to the electrode contacts, are individually connected to the cover assembly. However, when any of the current collectors is not aligned with the connection position on the cover assembly, connection to the terminals becomes difficult. Here, since the current collectors are already soldered to the electrode contacts, it is difficult to adjust the position of the current collectors, thus reducing the assemblability with the cover assembly. Summary of the Invention

[0009] Technical issues

[0010] One object of this disclosure is to provide a secondary battery and a method for manufacturing a secondary battery, wherein the current collector has an integral structure, thereby improving the assemblability with the cover assembly.

[0011] Another object of this disclosure is to provide a secondary battery and a method for manufacturing a secondary battery, wherein the length of the electrode contacts is reduced, thereby reducing the resistance to current flow.

[0012] Technical solution

[0013] A secondary battery according to one aspect of this disclosure may include: a first electrode contact connected to a first electrode; a second electrode contact connected to a second electrode; a current collector assembly including: a current collector holder formed of an insulating material, the current collector holder having a first hole formed at a first side of the current collector holder and a second hole formed at a second side of the current collector holder; a first current collector connected to an upper portion of the first side of the current collector holder and having a first slit aligned with the upper portion of the first hole, the first current collector including a first connection terminal; and a second current collector connected to an upper portion of a second side of the current collector holder and having a second slit aligned with the upper portion of the second hole, the second current collector including a second connection terminal; and a cover assembly including a first electrode terminal and a second electrode terminal electrically connected to the first current collector and the second current collector, respectively. The first electrode contact can be inserted into the first slit and can be connected to the upper surface of the first current collector.

[0014] The first slit can be formed at the center in the width direction of the first current collector.

[0015] The width of the first slit can be equal to the width of the first hole.

[0016] The inner surface of the first slit may have a section perpendicular to the lower surface of the first current collector.

[0017] The inner surface of the first hole may have a section perpendicular to the upper surface of the current collector holder.

[0018] The lower surface of the current collector holder can be tilted toward the first hole.

[0019] The edge where the lower surface of the current collector intersects with the inner surface of the first hole can be rounded.

[0020] The upper surface of the first current collector can be inclined toward the first slit.

[0021] The edge where the upper surface of the first current collector intersects the inner surface of the first slit can be rounded.

[0022] The first retaining portion can protrude from the upper surface of the current collector retainer, and the first retaining portion is inserted into the first slit and fixes the first current collector to the upper part of the current collector retainer.

[0023] The first retaining portion can cover the inner surface of the first slit.

[0024] The inner surface of the first retaining part can be a curved surface.

[0025] The first electrode contact can be configured as multiple first electrode contacts.

[0026] Multiple first electrode contacts can be bent and connected to the upper surface of the first current collector.

[0027] At least one of the plurality of first electrode contacts can be bent in one direction, and the remaining first electrode contacts can be bent in the opposite direction.

[0028] The cover assembly may also include a cover plate having a first terminal hole for insertion of a first connection terminal and a second terminal hole for insertion of a second connection terminal.

[0029] The distance between the first connecting terminal and the second connecting terminal can be equal to the distance between the first terminal hole and the second terminal hole.

[0030] A method of manufacturing a secondary battery according to one aspect of the present disclosure may include: an insertion operation of inserting a first electrode tab into a first slit; a bending operation of bending the first electrode tab; a welding operation of welding the first electrode tab to the upper surface of a first current collector; and an assembly operation of inserting a first connecting terminal into a first terminal hole and connecting the current collector assembly to a cover assembly.

[0031] Beneficial effects

[0032] According to one aspect of this disclosure, the current collector can have an integral structure, thereby improving its assemblability with the cover assembly.

[0033] According to one aspect of this disclosure, the length of the electrode contacts can be reduced, thereby reducing the resistance to current flow. Attached Figure Description

[0034] Figure 1 This is a perspective view of a secondary battery according to a first embodiment of the present disclosure.

[0035] Figure 2 It is a diagram. Figure 1 A three-dimensional diagram showing the partially exploded configuration of a secondary battery.

[0036] Figure 3 This is a 3D view showing the connection status of the electrode contacts.

[0037] Figure 4 This is an exploded 3D view of the configuration of the current collector component.

[0038] Figure 5 This is a cross-sectional view showing the state before the electrode contacts are inserted.

[0039] Figure 6 It is a cross-sectional view of the electrode contacts that are bent and connected to the current collector.

[0040] Figure 7 It is a diagram. Figure 6 Enlarged cross-sectional view of part A.

[0041] Figure 8 The diagram shows... Figure 7 Example of modifying the stream aggregation component.

[0042] Figure 9a and Figure 9b This is a cross-sectional view illustrating a partial configuration of a secondary battery according to a second embodiment of the present disclosure.

[0043] Figure 10 The diagram shows... Figure 9a and Figure 9b Example of modifying the stream aggregation component.

[0044] Figure 11 The diagram shows... Figure 9a and Figure 9b Another example of a modified stream collection component.

[0045] Figure 12 This is an exploded perspective view illustrating the configuration of the current collector assembly of a secondary battery according to a third embodiment of the present disclosure.

[0046] Figure 13 It is a diagram. Figure 12 Cross-sectional view of the current collector component.

[0047] Figure 14 The diagram shows... Figure 13 Example of modifying the stream aggregation component.

[0048] Figure 15 This is a perspective view of a current collector assembly for a secondary battery according to a fourth embodiment of the present disclosure.

[0049] Figures 16a to 16c The diagram shows the electrode contacts being inserted into... Figure 15 A top view of the process in the flow collection component.

[0050] Figure 17This is a block diagram illustrating a method for manufacturing a secondary battery according to a first embodiment of the present disclosure.

[0051] Figure 18a and Figure 18b The diagram shows... Figure 17 Insertion operation.

[0052] Figure 19a and Figure 19b The diagram shows... Figure 17 The bending operation.

[0053] Figure 20 The diagram shows... Figure 17 Welding operations.

[0054] Figure 21 The illustration includes Figure 1 A 3D view of the battery module of a secondary battery.

[0055] Figure 22 The illustration includes Figure 21 A 3D view of the battery module and battery pack. Detailed Implementation

[0056] Because this disclosure can be modified in various forms and has various implementations, specific implementations will be illustrated in the accompanying drawings and described in detail with reference to the drawings. However, this is not intended to limit this disclosure to a particular mode of practice, and it should be understood that all variations, equivalents, and alternatives without departing from the spirit and technical scope of this disclosure are included in this disclosure.

[0057] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. In this disclosure, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising,” “having,” etc., as used in this specification, are intended to indicate the presence of said features, integrals, steps, operations, elements, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0058] In this specification, the term "length direction" refers to Figure 2 In the ±x direction, the term "width direction" refers to... Figure 2 The ±y direction, and the term "height direction" refers to Figure 2 The ±z direction in the middle.

[0059] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that throughout the drawings, the same reference numerals refer to the same elements. To avoid unnecessarily obscuring the spirit of the disclosure, details of well-known configurations and functions may be omitted. For the same reason, some elements in the drawings are enlarged, omitted, or depicted schematically.

[0060] The secondary battery according to the first embodiment of the present disclosure will be described below.

[0061] Figure 1 This is a perspective view of a secondary battery according to a first embodiment of the present disclosure. Figure 2 It is a diagram. Figure 1 A three-dimensional diagram showing the partially exploded configuration of a secondary battery. Figure 3 This is a 3D view showing the connection status of the electrode contacts.

[0062] Reference Figures 1 to 3 The secondary battery 10 according to the first embodiment of the present disclosure includes: an electrode assembly 300, wherein a separator 350 is inserted between a first electrode 310 and a second electrode 330; a current collector 500 electrically connected to the electrode assembly 300; a housing 100 containing the electrode assembly 300; and a cover assembly 700 for sealing the housing 100.

[0063] The electrode assembly 300 can be configured such that a spacer 350 is inserted between alternately arranged first electrodes 310 and second electrodes 330. In other words, the electrode assembly 300 can be formed by alternately stacking the first electrode 310, spacer 350, second electrode 330, and spacer 350 in the listed order, wherein the spacer 350 is positioned between the first electrode 310 and the second electrode 330. Here, as electrodes with opposite polarities, the first electrode 310 and the second electrode 330 can be positive and negative electrodes, respectively, or conversely, the first electrode 310 and the second electrode 330 can be negative and positive electrodes, respectively.

[0064] The first electrode 310 and the second electrode 330 may include corresponding electrode active portions 311 and 331 and corresponding electrode tabs 313 and 333, wherein the electrode active portions 311 and 331 are regions in which active material is applied to a thin plate formed of metal foil, and the electrode tabs 313 and 333 are regions in which no active material is applied.

[0065] The first electrode active portion 311 can be formed by applying an active material, such as a transition metal oxide, to a metal foil, such as an aluminum foil. The second electrode active portion 331 can be formed by applying an active material, such as graphite or carbon, to a metal foil, such as a copper foil or a nickel foil.

[0066] The first electrode tab 313 may protrude from one side of the first electrode active portion 311. The second electrode tab 333 may protrude from one side of the second electrode active portion 331. Here, the first electrode tab 313 and the second electrode tab 333 may protrude side by side toward the cover assembly 700. Alternatively, the first electrode tab 313 and the second electrode tab 333 may protrude in different directions.

[0067] The first electrode tab 313 and the second electrode tab 333 are formed by cutting a metal foil to protrude from the metal foil, and thus can be integrally formed with the metal foil of the first electrode active portion 311 and the second electrode active portion 331, respectively.

[0068] The first electrode contact 313 and the second electrode contact 333 can have different polarities and can be spaced apart from each other by a certain distance.

[0069] Each of the first electrode contact 313 and the second electrode contact 333 can be formed by overlapping multiple thin films, and the thin films can be connected and contacted to each other by ultrasonic welding, laser welding, etc., to facilitate the flow of current.

[0070] A separator 350 is disposed between the first electrode 310 and the second electrode 330, and more specifically, between the active portion 311 of the first electrode and the active portion 331 of the second electrode, to prevent short circuits between the electrodes and allow ion movement. For example, the separator 350 can be made of various materials such as polyethylene, polypropylene, or composite films thereof.

[0071] The electrode assembly 300 can be wrapped with an insulating film or insulating tape and can be insulated from the housing 100. The insulating film or insulating tape can be made of materials such as polypropylene or polyimide that have excellent insulation properties even at high temperatures.

[0072] In this embodiment, the electrode assembly 300 can be formed by winding the first electrode 310 and the second electrode 330 together (winding type), or by overlapping the first electrode 310 and the second electrode 330 parallel to each other (stacked type).

[0073] In this embodiment, one electrode assembly 300 can be housed in a housing 100. That is, each electrode assembly 300 can be housed in a corresponding housing 100. Therefore, each electrode assembly 300 is individually protected, thereby reducing the risk of short circuit with another electrode assembly 300 and reducing heat buildup, thus preventing the risk of thermal runaway. However, this disclosure is not limited thereto, and multiple electrode assemblies 300 can be housed in one housing 100.

[0074] The current collector assembly 500 includes a current collector holder 550 formed of an insulating material, a first current collector 510 connected to an upper portion of a first side of the current collector holder 550, and a second current collector 530 connected to an upper portion of a second side of the current collector holder 550. The current collector assembly 500 is configured such that the separate current collectors 510 and 530 are connected and integrated through the current collector holder 550, and function as a single current collector component.

[0075] The current collector holder 550 with insulating properties can connect separate current collectors 510 and 530 with different polarities, so that the separate current collectors 510 and 530 are held at a predetermined interval, and can prevent short circuits between different electrodes 310 and 330 in the integrated current collector assembly 500.

[0076] The first current collector 510 is attached to the upper portion of a first side of the current collector holder 550 along its length direction (x-direction), and the second current collector 530 is attached to the upper portion of a second side of the current collector holder 550. Each of the current collectors 510 and 530 can be attached to the current collector holder 550 by means of adhesive, adhesive tape, or the like. Alternatively, each of the current collectors 510 and 530 can be integrally formed with the current collector holder 550 by insert injection molding.

[0077] The first current collector 510 and the second current collector 530 may be arranged on the upper portion of the current collector holder 550 to be spaced apart from each other in the length direction (x direction). Each of the first current collector 510 and the second current collector 530 may be formed as a rectangle with a width (in the y direction) equal to or less than the width of the current collector holder 550.

[0078] Unlike the current collector holder 550 connected to the lower portions of the first current collector 510 and the second current collector 530, the first current collector 510 and the second current collector 530 can be formed of a conductive material. Therefore, the first current collector 510 can electrically connect the first electrode terminal 710 exposed outside the cover assembly 700 to the first electrode contact 313. The second current collector 530 can electrically connect the second electrode terminal 730 exposed outside the cover assembly 700 to the second electrode contact 333.

[0079] The first current collector 510 and the second current collector 530 are respectively provided with a first slit 511 and a second slit 531. The first slit 511 and the second slit 531 are respectively connected to the first hole (551, see [reference]) formed in the current collector holder 550. Figure 4 ) and the second hole (553, see Figure 4 Align the upper part of the ).

[0080] The first electrode contact 313 is inserted into the first hole (551, see...). Figure 4 The second electrode contact 333 is inserted into the second hole (553, see 511) and the first slit 511. Figure 4 ) and the second slit 531.

[0081] The inserted electrode contacts 313 and 333 can be bent and connected to the upper surfaces of current collectors 510 and 530, respectively. Electrode contacts 313 and 333 can also be connected to current collectors 510 and 530 by welding. Welding can include laser welding, ultrasonic welding, etc.

[0082] Electrode contacts 313 and 333 can be directly welded to the upper surfaces of current collectors 510 and 530. Alternatively, welding can be performed after metal plates are placed on the upper portions of electrode contacts 313 and 333.

[0083] In some cases, insulating tape or film may cover the welded portions. Therefore, electrode contacts 313 and 333 welded to current collectors 510 and 530 can be insulated from the cover assembly 700. That is, as described later, electrode contacts 313, 333 can be electrically connected to electrode terminals 710 and 730 via current collectors 510 and 530, and direct contact between electrode contacts 313, 333 and cover assembly 700 can be prevented. In this case, the insulating tape or film can be made of materials such as polypropylene or polyimide that have excellent insulating properties even at high temperatures.

[0084] When electrode contacts 313 and 333 are connected to current collectors 510 and 530, electrodes 310 and 330 can be electrically connected to current collectors 510 and 530, respectively.

[0085] The first current collector 510 and the second current collector 530 can be electrically connected to the first electrode terminal 710 and the second electrode terminal 730, respectively. When the current collectors 510 and 530 are connected to the electrode terminals 710 and 730, respectively, the electrodes 310 and 330 can be electrically connected to the electrode terminals 710 and 730, respectively.

[0086] Current collectors 510 and 530 can be connected to electrode terminals 710 and 730 respectively via connection terminals 513 and 533.

[0087] The first connecting terminal 513 may be formed on the upper surface of the first current collector 510. The first connecting terminal 513 may be positioned approximately at the center of the first current collector 510, but this disclosure is not limited thereto, and the first connecting terminal 513 may be positioned biased to one side in the width direction (y-direction) of the first current collector 510. The first connecting terminal 513 may be integrally formed with the first current collector 510 in a cylindrical shape, or may be coupled to the first current collector 510. The first connecting terminal 513 may be inserted into the first terminal hole 711 to electrically connect the first current collector 510 and the first electrode terminal 710. When the first current collector 510 and the first electrode terminal 710 are electrically connected, the first electrode 310 and the first electrode terminal 710 may also be electrically connected.

[0088] The second connection terminal 533 may be formed on the upper surface of the second current collector 530. The second connection terminal 533 may be positioned approximately at the center of the second current collector 530, but this disclosure is not limited thereto, and the second connection terminal 533 may be positioned biased to one side in the width direction (y-direction) of the second current collector 530. The second connection terminal 533 may be integrally formed with the second current collector 530 in a cylindrical shape, or may be coupled to the second current collector 530. The second connection terminal 533 may be inserted into the second terminal hole 731 to electrically connect the second current collector 530 and the second electrode terminal 730. When the second current collector 530 and the second electrode terminal 730 are electrically connected, the second electrode 330 and the second electrode terminal 730 may also be electrically connected.

[0089] The distance D1 between the first connecting terminal 513 and the second connecting terminal 533 can be equal to the distance D2 between the first terminal hole 711 and the second terminal hole 731. Since the connecting terminals 513 and 533 are integrated with the current collector assembly 500 and are constrained in position, when the first connecting terminal 513 is aligned with the first terminal hole 711, the second connecting terminal 533 can also be easily aligned with the second terminal hole 731.

[0090] Therefore, current collectors 510 and 530 can be connected to the cover assembly 700 by aligning only one of the connecting terminals 513 and 533 with the corresponding terminal hole, without individually adjusting the positions of the connecting terminals 513 and 533. Thus, connecting terminals 513 and 533 can be simultaneously aligned with the corresponding terminal holes 711 and 731. Therefore, the assembly efficiency of current collectors 510 and 530 and the cover assembly 700 can be improved.

[0091] Further details about the structure of the flow collection component 500 will be described later.

[0092] The cover assembly 700 can seal the opening of the box 100 that houses the electrode assembly 300, and may include a cover plate 750, a first electrode terminal 710, and a second electrode terminal 730.

[0093] The cover 750 may have a plate shape that covers the opening of the box 100. The cover 750 may have a shape corresponding to the shape of the opening of the box 100. The cover 750 may be formed of the same material as the box 100. The cover 750 may be fixed to the box 100 by laser welding.

[0094] The cover plate 750 may have an electrolyte injection hole 770 for injecting electrolyte, a first terminal hole 711 for inserting a first connecting terminal 513, a second terminal hole 731 for inserting a second connecting terminal 533, and a vent hole 740 that opens when the pressure inside the box 100 exceeds a predetermined pressure value. However, the location of the vent hole 740 is not limited to this, and the vent hole 740 may be formed on a side of the box 100, for example, on the side surface or bottom surface of the box 100.

[0095] The first electrode terminal 710 and the second electrode terminal 730 may be formed to protrude from the cover plate 750. The first electrode terminal 710 may be electrically connected to the first electrode 310 via the first current collector 510, and the second electrode terminal 730 may be electrically connected to the second electrode 330 via the second current collector 530.

[0096] The first electrode terminal 710 and the second electrode terminal 730 may each have a circular plate shape or a rectangular plate shape. The first electrode terminal 710 and the second electrode terminal 730 may be connected to a busbar, etc.

[0097] A first insulator (not shown) may be provided between the first electrode terminal 710 and the cover plate 750 to electrically insulate the first electrode terminal 710 from the cover plate 750. Additionally, a second insulator (not shown) may be provided between the second electrode terminal 730 and the cover plate 750 to electrically insulate the second electrode terminal 730 from the cover plate 750.

[0098] The housing 100 can form the external shape of the secondary battery 10, and an internal space for accommodating the electrode assembly 300 can be formed inside the housing 100, wherein an opening is formed on one side of the housing 100. The housing 100 can have a cuboid shape and can be made of a rigid material capable of protecting the electrode assembly 300 housed therein. For example, the housing 100 can be made of a metal such as aluminum or stainless steel.

[0099] The electrolyte can be housed together with the electrode assembly 300 in the cartridge 100. The electrolyte can be formed from a lithium salt, such as LiPF6 or LiBF4, dissolved in an organic solvent, such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), or dimethyl carbonate (DMC). The electrolyte can be in a liquid, solid, or gel state.

[0100] Battery module M can be configured to include a plurality of secondary batteries 10 according to this embodiment (see Figure 21 Multiple secondary batteries 10 can be interconnected via busbars B, etc., to form a battery module M. Alternatively, the battery pack P can be configured to include multiple battery modules M (see [reference needed]). Figure 22 The battery pack P can be constructed by housing multiple battery modules M inside the upper battery pack housing VC and the lower battery pack housing LC that constitute the battery pack housing C. Furthermore, the battery pack P can be installed in a vehicle that transports goods or people or moves during operation. Such a vehicle can include bicycles, heavy equipment, agricultural or fishing equipment, automobiles, buses, or aircraft. Here, the automobile can be an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The automobile can include a four-wheeled vehicle or a two-wheeled vehicle. The vehicle can operate by receiving electricity from the battery pack P.

[0101] Figure 4 This is an exploded 3D view of the configuration of the current collector component. Figure 5 This is a cross-sectional view showing the state before the electrode contacts are inserted. Figure 6 It is a cross-sectional view of the electrode contacts that are bent and connected to the current collector.

[0102] like Figure 4 As illustrated, the current collector assembly 500 includes a current collector retainer 550 formed of insulating material, a first current collector 510 connected to an upper portion of a first side of the current collector retainer 550, and a second current collector 530 connected to an upper portion of a second side of the current collector retainer 550.

[0103] The current collector 550 can be formed to extend along its length (x-direction). The current collector 550 can be manufactured in a rectangular shape where the length (x-direction) is greater than the width (y-direction). The width (y-direction) of the current collector 550 can be equal to or less than the width (y-direction) of the electrode assembly 300. The length (x-direction) of the current collector 550 can also be equal to or less than the length (x-direction) of the electrode assembly 300.

[0104] The current collector 550 can be formed from an insulating material, such as plastic or silicone rubber. The current collector 550 can be formed by machining the insulating material or by injection molding using a mold.

[0105] A first hole 551 configured to allow the insertion of a first electrode contact 313 can be formed at a first side portion along the length direction (x direction) of the current collector 550. A second hole 553 configured to allow the insertion of a second electrode contact 333 can be formed at a second side portion along the length direction (x direction) of the current collector 550. The length L2 of the first hole 551 and the length L2 of the second hole 553 can be equal to or slightly greater than the length L of the first electrode contact 313 and the length L of the second electrode contact 333, respectively.

[0106] The first current collector 510 can be connected to the upper portion of the first side of the current collector holder 550 in the length direction (x direction), and the second current collector 530 can be connected to the upper portion of the second side of the current collector holder 550.

[0107] As described above, a first slit 511 is formed in the first current collector 510, and a second slit 531 is formed in the second current collector 530. The first slit 511 and the second slit 531 can be aligned with the upper portions of the first hole 551 and the second hole 553, respectively, so that the first electrode contact 313 and the second electrode contact 333 can be inserted into the first slit 511 and the second slit 531, respectively. For this purpose, the length L1 of the first slit 511 and the length L2 of the second slit 531 can be equal to or slightly greater than the length L2 of the first hole 551 and the length L2 of the second hole 553, respectively.

[0108] The first slit 511 and the second slit 531 can be formed at the center of the first current collector 510 and the second current collector 530 in the width direction (y direction), respectively. In other words, the first slit 511 can be formed to be spaced apart from the two ends of the first current collector 510 in the width direction (y direction) by the same distance. The second slit 531 can also be formed to be spaced apart from the two ends of the second current collector 530 in the width direction (y direction) by the same distance. Therefore, the first electrode contact 313 and the second electrode contact 333 can be inserted into the first slit 511 and the second slit 531, respectively, without being biased to one side in the width direction (y direction).

[0109] In this embodiment, the structure of the first electrode contact 313 and the first current collector 510 can be similarly applied to the second electrode contact 333 and the second current collector 530. Hereinafter, the structure of the first electrode contact 313, the current collector holder 550, and the first current collector 510 will be described as an example, and redundant descriptions of the second electrode contact 333 and the second current collector 530 will be omitted.

[0110] Reference Figure 5 and Figure 6 The first electrode tab 313 can be configured as multiple first electrode tabs 313. The multiple first electrode tabs 313 can be gathered toward the center in the width direction (y direction) and continuously inserted into the first hole 551 and the first slit 511.

[0111] The plurality of first electrode tabs 313 inserted into the first hole 551 and the first slit 511 can be bent and connected to the upper surface of the first current collector 510. More specifically, at least some of the first electrode tabs 313a can be bent in one direction, and the remaining first electrode tabs 313b can be bent in the opposite direction to that direction in order to be connected to the upper surface of the first current collector 510.

[0112] For example, among the plurality of first electrode tabs 313, some of the first electrode tabs 313a corresponding to approximately half of the plurality of first electrode tabs 313 can be bent along the +y direction and connected to the upper surface of one side of the first current collector 510 in the width direction (y direction). The remaining first electrode tabs 313b corresponding to the other half of the plurality of first electrode tabs 313 can be bent along the -y direction and connected to the upper surface of the remaining side of the first current collector 510 in the width direction (y direction).

[0113] However, this disclosure is not limited thereto, and all of the first electrode contacts 313 may be bent along the +y direction or along the -y direction and connected to the upper surface of the first current collector 510.

[0114] As described above, when multiple first electrode tabs 313 are inserted into the first slit 511, bent, and then connected to the upper surface of the first current collector 510, the first electrode tabs 313 can pass through the current collector assembly 500 in a vertical direction. Therefore, the first electrode tabs 313 can be manufactured with a reduced length (H, see below). Figure 4 This reduces resistance and heat generated by current flow, thus effectively mitigating the heat generation problem.

[0115] Figure 7 It is a diagram. Figure 6 Enlarged cross-sectional view of part A.

[0116] like Figure 7 As illustrated, the inner surfaces 511a of the first slit 511 facing each other may have a section perpendicular to the lower surface of the first current collector 510. Additionally, the inner surfaces 551a of the first hole 551 facing each other may also have a section perpendicular to the upper surface of the current collector holder 550.

[0117] In this embodiment, the width W1 of the first slit 511 is defined as the distance between the inner surfaces 511a of the first slit 511 that face each other. Similarly, the width W2 of the first hole 551 is defined as the distance between the inner surfaces 551a of the first hole 551 that face each other.

[0118] The width W1 of the first slit 511 can be equal to the width W2 of the first hole 551. That is, the inner surface 511a of the first slit 511 and the inner surface 551a of the first hole 551 can be continuously connected to each other. For example, the inner surface 511a of the first slit 511 and the inner surface 551a of the first hole 551 can be connected collinearly without forming a step.

[0119] Therefore, since all the first electrode contacts 313 inserted into the first hole 551 can pass through the first slit 511, the process of inserting the first electrode contacts 313 into the first slit 511 is facilitated.

[0120] In the case where the first slit 511 and the first hole 551 are formed by post-processing operations after manufacturing the first current collector 510 and the current collector holder 550, according to the above structure, the first slit 511 and the first hole 551 can be formed by a single process of vertically penetrating the current collector assembly 500, thereby simplifying the process of manufacturing the current collector assembly 500.

[0121] Although not shown, the edges where the upper surface of the first current collector 510 intersects with the inner surfaces 511a of the first slit 511 can also be rounded. Therefore, the first electrode tab 313 contacts the curved surface, thereby reducing the risk of disconnection and improving the electrical stability of the secondary battery 10.

[0122] Figure 8 The diagram shows... Figure 7 Example of modifying the stream aggregation component.

[0123] Reference Figure 8The width W2 of the first hole 551 can be smaller than the width W1 of the first slit 511. That is, a step portion can be formed between each inner surface 511a of the first slit 511 and the corresponding inner surface 551a of the first hole 551, so that the inner surface 551a of the first hole 551 can protrude relative to the inner surface 511a of the first slit 511.

[0124] Based on the above structure, the inner surfaces 551a of the first hole 551 facing each other can accommodate the first electrode tab (313, see above). Figure 7 Press inward along the width direction (y direction). Therefore, the first electrode tab (313, see...) Figure 7 It can be inserted into the first hole 551 and the first slit 511 and fixed in place, thereby facilitating the process of welding the first electrode tab 313 to the upper surface of the first current collector 510.

[0125] The secondary battery according to the second embodiment of the present disclosure will be described below.

[0126] Figure 9a and Figure 9b This is a cross-sectional view illustrating a partial configuration of a secondary battery according to a second embodiment of the present disclosure.

[0127] The secondary battery according to the second embodiment of this disclosure has the same structure as the first embodiment described above, except for the current collector holder 550, and therefore redundant descriptions of the repeating configuration are omitted.

[0128] Reference Figure 9a and Figure 9b The upper surface of the first current collector 510 may be inclined toward the first slit 511. Optionally, the lower surface of the current collector holder 550 may also be inclined toward the first hole 551. That is, in this embodiment, the current collector assembly 500 may be configured such that only the upper surface of the first current collector 510 is inclined toward the first slit 511, only the lower surface of the current collector holder 550 is inclined toward the first hole 551, or both the upper surface of the first current collector 510 and the lower surface of the current collector holder 550 are inclined.

[0129] First, the upper surface of the first current collector 510 can be inclined toward the first slit 511 from opposite ends in the width direction (y direction) of the first current collector 510. Therefore, the first current collector 510 can have a thickness that decreases from the opposite ends toward the center in the width direction (y direction).

[0130] Because the upper surface of the first current collector 510 is inclined toward the first slit 511, the first electrode contact 313 can be connected to the upper surface of the first current collector 510 without excessive bending. Therefore, the risk of the first electrode contact 313 disconnecting can be reduced, thereby improving the electrical stability of the secondary battery 10.

[0131] Furthermore, in this case, the area where the plurality of first electrode contacts 313 are welded to the upper surface of the first current collector 510 is increased, so that the first electrode contacts 313 can be stably connected to the first current collector 510.

[0132] The lower surface of the current collector 550 may be formed to be inclined toward the first hole 551 formed at the center in the width direction (y direction) of the current collector 550. For example, the current collector 550 may have a thickness that gradually decreases from opposite ends in the width direction (y direction) of the current collector 550 toward the first hole 551.

[0133] The inclined lower surface of the current collector 550 can guide the first electrode tab 313 toward the first hole 551.

[0134] Specifically, such as Figure 9a As illustrated, when the current collector assembly 500 moves downward toward the first electrode contact 313, the first electrode contact 313 can sequentially contact the lower surface of the current collector holder 550, starting from the end portion located in the width direction (y direction). Figure 9b As illustrated, as the current collector assembly 500 moves further downward, the first electrode tab 313 can be guided to the first hole 551 by the inclined lower surface of the current collector holder 550. Subsequently, other first electrode tabs 313 positioned more inwardly in the width direction (y-direction) can sequentially contact the lower surface of the current collector holder 550 and can be sequentially guided to the first hole 551. In this way, multiple first electrode tabs 313 can be guided by the inclined lower surface of the current collector holder 550 and inserted into the first hole 551 and the first slit 511.

[0135] Therefore, in this embodiment, there is no need for a separate process of assembling the first electrode tabs 313 toward the center in the width direction, thereby simplifying the process of manufacturing the secondary battery 10.

[0136] Figure 10 It is a diagram. Figure 9a and Figure 9b Example of modifying the stream aggregation component. Figure 11 The diagram shows... Figure 9a and Figure 9b Another example of a modified stream collection component.

[0137] like Figure 10 As illustrated, the edges where the lower surface of the current collector 550 intersects with the inner surfaces 551a of the first hole 551 can be rounded. Therefore, the lower surface of the current collector 550 and the inner surfaces 551a of the first hole 551 can be connected by a curved surface. Specifically, the lower surface of the current collector 550 and the inner surfaces 551a of the first hole 551 can be connected by a downwardly convex curved surface.

[0138] In addition, such as Figure 11 As illustrated, the edges where the inclined upper surface of the first current collector 510 intersects with the inner surfaces 511a of the first slit 511 can be rounded. Therefore, the inclined upper surface of the first current collector 510 and the inner surfaces 511a of the first slit 511 can be connected by a curved surface. Specifically, the inclined upper surface of the first current collector 510 and the inner surfaces 511a of the first slit 511 can be connected by an upwardly convex curved surface.

[0139] exist Figure 10 and Figure 11 In this case, the first electrode contact 313 can contact the curved surface, thereby reducing the risk of disconnection. Therefore, the electrical stability of the secondary battery 10 can be improved.

[0140] The secondary battery according to the third embodiment of the present disclosure will be described below.

[0141] Figure 12 This is an exploded perspective view illustrating the configuration of the current collector assembly of a secondary battery according to a third embodiment of the present disclosure. Figure 13 It is a diagram. Figure 12 Cross-sectional view of the current collector component. Figure 14 The diagram shows... Figure 13 Example of modifying the stream aggregation component.

[0142] Apart from the first holding portion 555 and the second holding portion 557, the secondary battery according to the third embodiment of this disclosure has the same structure as the first embodiment and the modified example described above, and therefore redundant descriptions of the same configuration are omitted. Furthermore, in this embodiment, the second holding portion 557 has the same structure as the first holding portion 555. Therefore, the first holding portion 555 will be described below as an example, and the description of the second holding portion 557 having the same structure will be omitted.

[0143] Reference Figure 12 and Figure 13 The first retaining portion 555 and the second retaining portion 557 can protrude from the upper surface of the current collector retainer 550.

[0144] The first retaining portion 555 can be formed as a pair of first retaining portions 555 facing each other in the width direction (y direction). The pair of first retaining portions 555 can protrude from the upper surface of the current collector retainer 550 and can be inserted into the first slit 511. The pair of first retaining portions 555 inserted into the first slit 511 can cover the inner surface 511a of the first slit 511.

[0145] The distance between the outer surfaces of the pair of first retaining portions 555 in the width direction (y direction) can be equal to or greater than the width W1 of the first slit 511. Therefore, when the pair of first retaining portions 555 are fitted into the first slit 511, the first current collector 510 can be fixed to the upper part of the current collector holder 550.

[0146] According to this embodiment, the first current collector 510 can be fixed to the current collector holder 550 in a simplified manner. Therefore, the first current collector 510 and the current collector holder 550 can be integrated into one unit without a separate bonding process, thereby improving the efficiency of manufacturing the current collector assembly 500.

[0147] The width W2 of the first hole 551 is defined as the distance between the inner surfaces of the pair of first retaining portions 555 facing each other. Therefore, in this embodiment, the width W2 of the first hole 551 is smaller than the width W1 of the first slit 511.

[0148] The opposing inner surfaces of a pair of first retaining portions 555 may each have a segment perpendicular to the upper surface of the current collector retainer 550.

[0149] Alternatively, such as Figure 14 As illustrated, the opposing inner surfaces of a pair of first retaining portions 555 can be formed as curved surfaces.

[0150] Specifically, the inner surface of the first retaining portion 555 can be formed as a curved surface that bulges inward along the width direction (y direction). Therefore, the first electrode tab 313 inserted into the first hole 551 and the first slit 511 contacts the curved surface and bends smoothly, thereby reducing the risk of disconnection and improving the electrical stability of the secondary battery 10.

[0151] However, this disclosure is not limited to the above examples, and the opposing inner surfaces of a pair of first retaining portions 555 may each have an inclined section whose width increases from the upper portion toward the lower portion.

[0152] Additionally, although not illustrated in this embodiment, the first retaining portion 555 is not necessarily limited to a paired structure and can be formed to cover the first slit (511, see also) Figure 12 A rectangular structure on all the inner surfaces of ).

[0153] The secondary battery according to the fourth embodiment of the present disclosure will be described below.

[0154] Figure 15 This is a perspective view of a current collector assembly for a secondary battery according to a fourth embodiment of the present disclosure. Figures 16a to 16c The diagram shows the electrode contacts being inserted into... Figure 15 A top view of the process in the flow collection component.

[0155] Except for the insertion method of electrode contacts 313 and 333, the secondary battery according to the fourth embodiment of this disclosure has the same structure as the first embodiment and the modified example described above, and therefore redundant descriptions of the same configuration are omitted.

[0156] like Figure 15 As illustrated, a portion of the side surface of the first current collector 510 can be cut to form a first notch 512. A plurality of first electrode tabs 313 can be inserted from the side surface of the first current collector 510 into the first notch 512.

[0157] More specifically, the first cut 512 can be formed by cutting a side surface of the first current collector 510 in the width direction (y direction). Through the first cut 512, a side surface of the first current collector 510 in the width direction (y direction) can be opened. The first cut 512 can be connected to the first slit 511 in the length direction (x direction).

[0158] Reference Figures 16a to 16c The structure will be described in more detail. Multiple first electrode tabs 313 can be inserted into the first cutout 512 through the open side of the first current collector 510. In this case, the first electrode tabs 313 can be inserted into the first cutout 512 either without being bundled together, or with being bundled together.

[0159] The plurality of first electrode tabs 313 inserted into the first notch 512 can slide along the length direction (x direction) and can be inserted into the first slit 511. Although not shown, during this process, the first electrode tabs 313 can be easily inserted into the first slit 511 by appropriately rotating the current collector 500 in a clockwise or counterclockwise direction.

[0160] The first current collector 510 may also include a first slit guide 514 configured to guide a plurality of first electrode contacts 313 inserted into the first cutout 512 toward the first slit 511.

[0161] The first slit guide portion 514 may be located at one of the opposite ends of the first current collector 510 in the width direction (y direction), the opposite end corresponding to the open side of the first current collector 510. Alternatively, although not shown, the first slit guide portion 514 may be formed at each of the opposite ends of the first current collector 510 in the width direction (y direction).

[0162] The first slit guide portion 514 may be formed to be inclined in the direction from the first cut 512 toward the first slit 511, or it may be rounded.

[0163] As the current collector assembly 500 moves along the -x direction or as the electrode assembly 300 moves along the +x direction, a plurality of first electrode contacts 313 inserted from the side surface of the first current collector 510 into the first notch 512 can slide toward the first slit 511. The plurality of first electrode contacts 313 sliding toward the first slit 511 can be guided to the first slit 511 by the first slit guide 514. During this process, the plurality of first electrode contacts 313 can converge toward the center in the width direction (y direction) and can be inserted into the first slit 511.

[0164] Based on the above structure, the combined length L3 of the first cut 512 and the first slit 511 relative to the length L of the first electrode contact 313 can satisfy the relationship L3>2L. That is, the combined length L3 of the first cut 512 and the first slit 511 can be greater than twice the length L of the first electrode contact 313.

[0165] In the case of the second current collector 530, the second slit 531, the second cut 532, and the second slit guide 534 can be formed in the same manner as the first current collector 510.

[0166] As the current collector 500 moves along the -y direction or as the electrode assembly 300 moves along the +y direction, the first electrode contact 313 and the second electrode contact 333 can be simultaneously inserted into the first cut 512 and the second cut 532, respectively. Subsequently, as the current collector 500 moves along the -x direction or as the electrode assembly 300 moves along the +x direction, the first electrode contact 313 and the second electrode contact 333 can be simultaneously inserted into the first slit 511 and the second slit 531, respectively.

[0167] The current collector holder 550 can be configured to correspond to the structure of the first current collector 510 and the second current collector 530. That is, the current collector holder 550 can be configured to have a first hole (551, see [reference]) with the same shape as the first slit 511, the first cutout 512, and the first slit guide portion 514. Figure 4 ), incision and guide section.

[0168] In this embodiment, since the electrode contacts 313 and 333 are inserted through the side surface of the current collector 500, the process of inserting the electrode contacts 313 and 333 into the corresponding slits 511 and 531 can be facilitated. Therefore, the process of manufacturing the secondary battery 10 can be simplified.

[0169] In the following, a method for manufacturing a secondary battery according to a first embodiment of the present disclosure will be described.

[0170] Figure 17 This is a block diagram illustrating a method for manufacturing a secondary battery according to a first embodiment of the present disclosure. Figure 18a and Figure 18b The diagram shows... Figure 17 Insertion operation. Figure 19a and Figure 19b The diagram shows... Figure 17 The bending operation. Figure 20 The diagram shows... Figure 17 Welding operations.

[0171] like Figure 17 As illustrated, a method for manufacturing a secondary battery according to a first embodiment of the present disclosure includes: an insertion operation S300 of inserting a first electrode contact 313 into a first slit 511; a bending operation S500 of bending the first electrode contact 313; a welding operation S700 of welding the first electrode contact 313 to the upper surface of a first current collector 510; and an assembly operation S900 of inserting a first connecting terminal 513 into a first terminal hole 711 and connecting the current collector assembly 500 and the cover assembly 700.

[0172] Reference Figure 18a Prior to the insertion operation S300, a receiving operation S100 may be performed to receive the electrode assembly 300 in the housing 100. Subsequently, the first electrode tab 313 may be gathered toward its center in the width direction (y-direction). The receiving operation S100 does not necessarily have to be performed before the insertion operation S300. The receiving operation S100 may be performed between the welding operation S700 and the assembly operation S900, which will be described later, or it may be performed after the assembly operation S900.

[0173] like Figure 18b As illustrated, in insertion operation S300, the current collector 500 moves downward or the electrode assembly 300 moves upward, causing the first electrode tab 313 to be continuously inserted into the first hole 551 and the first slit 511. In this case, the current collector 500 is vertically spaced apart from the electrode assembly 300 by a predetermined distance and is positioned above the electrode assembly 300.

[0174] However, the first electrode contact 313 is not necessarily inserted by moving the current collector 500 downward. The first electrode contact 313 can be inserted as described in the fourth embodiment above (see...). Figure 15 and Figures 16a to 16c It is inserted through the side surface of the current collector 500 as in the example.

[0175] Reference Figure 19a In the bending operation S500, the clamp J moves downward toward the inserted first electrode contact 313. The clamp J may have a generally T-shaped configuration with a protruding lower portion and wing-shaped sections. In this case, the opposite wing-shaped sections of the clamp J may be formed as curved or inclined surfaces. The wing-shaped sections of the clamp J may be curved or inclined plate-shaped, but are not limited to these, and may alternatively have an annular shape with only edges formed. In the longitudinal direction (x-direction), the width of the opposite wing-shaped sections of the clamp J may be smaller than the width of the first electrode contacts 313a and 313b (see...). Figure 20 ).

[0176] like Figure 19b As illustrated, the clamp J moves downwards, bending a plurality of first electrode contacts 313. For example, the clamp J may bend at least some of the first electrode contacts 313a toward one side in the width direction (y-direction), and may bend the remaining first electrode contacts 313b toward the other side in the width direction (y-direction). Alternatively, the clamp J may bend all of the first electrode contacts 313 toward one side or the other side in the width direction (y-direction).

[0177] The width W3 of the opposite wing of the clamp J can be greater than the width W1 of the first slit 511. Therefore, after the clamp J moves downward to a predetermined height without passing through the first slit 511, the opposite wing of the clamp J can be engaged on the first current collector 510. Thus, the clamp J can temporarily fix the position of the multiple first electrode contacts 313 through the opposite wing, causing the multiple first electrode contacts 313 to bend.

[0178] Reference Figure 20 In welding operation S700, the first electrode contact 313 can be welded to the upper surface of the first current collector 510. Specifically, welding can be performed in region W of the area where the first electrode contact 313 and the upper surface of the first current collector 510 are in contact with each other, and region W does not overlap with the fixture J.

[0179] The first electrode tab 313 can contact and be directly welded to the upper surface of the first current collector 510 in region W. Alternatively, welding can be performed after removing the fixture J and placing the additional metal plate on the first electrode tab 313.

[0180] Welding can be performed using laser welding, ultrasonic welding, etc., and can be carried out in patterns along directions such as the x-direction, y-direction, diagonal direction, or zigzag direction. After welding is completed, the fixture J can be removed, and assembly operation S900 can be performed.

[0181] Refer again Figure 3 In assembly operation S900, the cover assembly 700 can be positioned above the current collector assembly 500. To connect the current collector assembly 500 and the cover assembly 700, the first terminal hole 711 can be aligned with the position of the first connection terminal 513.

[0182] Here, the distance D1 between the first connecting terminal 513 and the second connecting terminal 533 can be equal to the distance D2 between the first terminal hole 711 and the second terminal hole 731. Since the connecting terminals 513 and 533 are integrated with the current collector assembly 500 and are constrained in position, when the first connecting terminal 513 is aligned with the first terminal hole 711, the second connecting terminal 533 can also be automatically aligned with the second terminal hole 731.

[0183] In this state, the first connection terminal 513 can be inserted into the first terminal hole 711, and the second connection terminal 533 can be inserted into the second terminal hole 731, thereby connecting the current collector assembly 500 and the cover assembly 700.

[0184] Therefore, in the current collector assembly 500, the secondary battery 10 including the current collector assembly 500, and the method of manufacturing the secondary battery 10 according to this disclosure, the alignment of only one of the connection terminals 513 and 533 with the corresponding terminal hole allows the other connection terminal 513 and 533 to be aligned with the corresponding terminal hole without the need to adjust the position of the connection terminals 513 and 533 separately. Therefore, the connection terminals 513 and 533 can be simultaneously aligned with the corresponding terminal holes 711 and 731, respectively. Therefore, the assemblability of the current collectors 510 and 530 and the cover assembly 700 can be improved.

[0185] Furthermore, the current collector assembly 500, the secondary battery 10 including the current collector assembly 500, and the method of manufacturing the secondary battery 10 according to this disclosure allow electrode contacts 313 and 333 to pass through slits 511 and 531 and be connected to the upper surfaces of current collectors 510 and 530. Therefore, electrode contacts 313 and 333 pass vertically through the current collector assembly 500 and are connected to current collectors 510 and 530. Thus, electrode contacts 313 and 333 can be manufactured with a reduced length (H, see below). Figure 4 This reduces resistance and heat generated by current flow, thus effectively mitigating the heat generation problem.

[0186] Although this disclosure has been described with reference to specific embodiments, it will be apparent to those skilled in the art that various changes or modifications may be made to this disclosure by adding, altering, or deleting components without departing from the spirit of this disclosure as defined in the appended claims. It should be noted that such changes or modifications also fall within the scope of this disclosure.

Claims

1. A secondary battery, comprising: The first electrode contact is connected to the first electrode. The second electrode contact is connected to the second electrode; A flow collection component, the flow collection component comprising: A current collector holder formed of insulating material, the current collector holder having a first hole formed on a first side of the current collector holder and a second hole formed on a second side of the current collector holder. A first current collector, connected to the upper portion of the first side of the current collector holder and having a first slit aligned with the upper portion of the first hole, the first current collector includes a first connecting terminal, and A second current collector, the second current collector being connected to the upper portion of the second side of the current collector holder and having a second slit aligned with the upper portion of the second hole, the second current collector including a second connecting terminal; and The cover assembly includes a first electrode terminal and a second electrode terminal electrically connected to the first current collector and the second current collector, respectively. The first electrode contact is inserted into the first slit and connected to the upper surface of the first current collector.

2. The secondary battery according to claim 1, wherein The first slit is formed at the center of the width direction of the first current collector.

3. The secondary battery according to claim 1, wherein The width of the first slit is equal to the width of the first hole.

4. The secondary battery according to claim 1, wherein The inner surface of the first slit has a section perpendicular to the lower surface of the first current collector.

5. The secondary battery according to claim 1, wherein The inner surface of the first hole has a section perpendicular to the upper surface of the current collector holder.

6. The secondary battery according to claim 1, wherein, The lower surface of the current collector holder is inclined toward the first hole.

7. The secondary battery according to claim 1, wherein, The lower surface of the current collector that intersects with the inner surface of the first hole has a rounded edge.

8. The secondary battery according to claim 1, wherein, The upper surface of the first current collector is inclined toward the first slit.

9. The secondary battery according to claim 1, wherein, The edge where the upper surface of the first current collector intersects the inner surface of the first slit is rounded.

10. The secondary battery according to claim 1, wherein, The first retaining portion protrudes from the upper surface of the current collector holder, and the first retaining portion is inserted into the first slit and fixes the first current collector to the upper part of the current collector holder.

11. The secondary battery according to claim 10, wherein, The first retaining portion covers the inner surface of the first slit.

12. The secondary battery according to claim 10, wherein, The inner surface of the first retaining portion is a curved surface.

13. The secondary battery according to claim 1, wherein, The first electrode contact is configured as a plurality of first electrode contacts.

14. The secondary battery according to claim 13, wherein, The plurality of first electrode contacts are bent and connected to the upper surface of the first current collector.

15. The secondary battery according to claim 14, wherein, At least one of the plurality of first electrode contacts is bent in one direction, and the remaining first electrode contacts are bent in the opposite direction.

16. The secondary battery according to claim 1, wherein, The cover assembly also includes: A cover plate having a first terminal hole for inserting the first connecting terminal and a second terminal hole for inserting the second connecting terminal.

17. The secondary battery according to claim 16, wherein, The distance between the first connecting terminal and the second connecting terminal is equal to the distance between the first terminal hole and the second terminal hole.

18. A method for manufacturing a secondary battery, said secondary battery being the secondary battery according to claim 17, the method comprising: The insertion operation of inserting the first electrode contact into the first slit; A bending operation is performed on the first electrode contact; The welding operation of welding the first electrode contact to the upper surface of the first current collector; as well as The assembly operation of inserting the first connection terminal into the first terminal hole and connecting the current collection assembly to the cover assembly.

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