Secondary batteries

Abstract

A secondary battery includes: a current collector assembly, the current collector assembly including: a current collector holder, in which a first insulating portion, a second insulating portion, and a connecting portion configured to connect the first insulating portion and the second insulating portion are integrally formed; a first current collector having a first connecting terminal; a second current collector having a second connecting terminal; and a fixing portion configured to fix the first current collector to the first insulating portion; a plurality of first electrode contacts connected to an upper surface of the first current collector; a plurality of second electrode contacts connected to an upper surface of the second current collector; and a cover assembly including a first electrode terminal connected to the first current collector and a second electrode terminal connected to the second current collector.

Description

Cross-references to related applications

[0001] This application claims priority to Korean Patent Application No. 10-2025-0015451, filed on February 6, 2025, and Korean Patent Application No. 10-2026-0006538, filed on January 13, 2026, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to secondary batteries. Background Technology

[0003] In recent years, the demand for portable electronic devices such as laptops, cameras, and mobile phones has grown rapidly, and electric vehicles, energy storage batteries, robots, and satellites are also developing rapidly. Therefore, research has been actively conducted on high-performance rechargeable batteries capable of repeated charging and discharging.

[0004] Specifically, lithium-ion secondary batteries typically use lithium-based oxides as the positive electrode active material and carbon-based materials as the negative electrode active material. Furthermore, a lithium-ion secondary battery includes: a positive electrode plate and a negative electrode plate respectively coated with the positive and negative electrode active materials; an electrode assembly in which the positive and negative electrode plates are separated by a spacer; and a housing configured to seal and contain the electrode assembly and electrolyte.

[0005] Furthermore, based on the shape of the battery casing, lithium secondary batteries can be classified as: can-type secondary batteries, in which the electrode assembly is housed in a metal can; and pouch-type secondary batteries, in which the electrode assembly is housed in a pouch made of aluminum laminate. Additionally, based on the shape of the metal can, can-type secondary batteries can be further classified as cylindrical batteries and prismatic batteries.

[0006] The secondary battery undergoes a process of soldering multiple electrode contacts, which are connected to the electrode plates, to the current collector. The current collector to which the electrode contacts are soldered is connected to the terminals of the cover assembly.

[0007] The positive and negative current collectors, to which the electrode contacts are connected, are individually connected to the cover assembly. However, if the connection position of any one of the current collectors to the cover assembly is misaligned, it is difficult to connect to the terminals. In this case, since the current collectors are already soldered to the electrode contacts, it is difficult to adjust the position of the current collectors, resulting in poor assemblability with the cover assembly. Summary of the Invention

[0008] Technical issues

[0009] Various aspects of this disclosure provide a secondary battery in which a current collector is integrated to improve assemblability with the cover assembly, thereby enabling reduction in manufacturing time and manufacturing costs.

[0010] Technical solution

[0011] A secondary battery according to one aspect of this disclosure includes: a current collector assembly, the current collector assembly including: a current collector holder, wherein a first insulating portion, a second insulating portion, and a connecting portion configured to connect the first insulating portion and the second insulating portion are integrally formed in the current collector holder; a first current collector, the first current collector being coupled to the first insulating portion and formed having a first connecting terminal; a second current collector, the second current collector being coupled to the second insulating portion and formed having a second connecting terminal; and a fixing portion configured to fix the first current collector to the first insulating portion; a plurality of first electrode contacts, the plurality of first electrode contacts being coupled to an upper surface of the first current collector; a plurality of second electrode contacts, the plurality of second electrode contacts being coupled to an upper surface of the second current collector; and a cover assembly, the cover assembly including a first electrode terminal connected to the first current collector and a second electrode terminal connected to the second current collector.

[0012] The first insulating portion may include: a first mounting groove into which a first current collector is inserted; and a sidewall configured to enclose the first mounting groove.

[0013] The fixing part may include an upper surface fixing element formed on the upper surface of the sidewall and configured to fix the upper surface of the first collector plate.

[0014] The upper surface fixing element can have a hook shape.

[0015] The upper surface fixing element may include a pair of upper surface fixing elements disposed on the face-to-face portions of the sidewall.

[0016] A pair of upper surface fixing elements can be configured to face each other.

[0017] A pair of upper surface fixing elements can be set to be staggered.

[0018] The fixing portion may include a side surface fixing element formed on the inner surface of the sidewall and configured to press the side surface of the first collector plate.

[0019] The side surface fixing element may include a pair of side surface fixing elements disposed on the inner surfaces of the portions of the sidewall facing each other.

[0020] The fixing part may include an adhesive element that is inserted between the first insulating part and the first current collector.

[0021] The width of the first insulating part can be greater than the width of the first current collector.

[0022] The fixing portion may include a pair of side surface fixing elements formed on the upper surface of the first insulating portion and configured to press against the opposite side surface of the first current collector.

[0023] The fixing part may also include an upper surface fixing element, which is positioned on the upper end of the side surface fixing element and is formed in a hook shape.

[0024] The side surface of the first insulating part can be a curved surface.

[0025] The connecting part can be formed with a pressure relief hole.

[0026] A pressure relief port may include multiple pressure relief ports.

[0027] The current collector holder may also include a first rib formed between the side surface of the first insulating portion and the connecting portion, and configured to support the first insulating portion.

[0028] The current collector holder may also include a second rib formed between the side surface of the second insulating portion and the connecting portion, and configured to support the second insulating portion, wherein the second rib may be formed to be diagonally symmetrical with respect to the first rib.

[0029] Multiple first electrode tabs may include a first foil tab group and a second foil tab group, which are arranged in different columns from each other.

[0030] The first foil bonding group and the second foil bonding group can be bent so that they face each other.

[0031] The cover assembly may also include a cover plate having a first terminal hole and a second terminal hole, wherein a first connecting terminal is inserted into the first terminal hole and a second connecting terminal is inserted into the second terminal hole.

[0032] The cover assembly may also include a top insulator disposed between the current collector assembly and the cover plate.

[0033] 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.

[0034] Beneficial effects

[0035] According to one aspect of this disclosure, the current collector is integrated to improve assembly with the cover assembly. Therefore, manufacturing time and costs can be reduced. Attached Figure Description

[0036] Figure 1This is a perspective view of a secondary battery according to a first embodiment of the present disclosure.

[0037] Figure 2 It's a diagram. Figure 1 An exploded 3D view of some components of a secondary battery.

[0038] Figure 3 It is a three-dimensional diagram illustrating the connected electrode contacts.

[0039] Figure 4 It is a three-dimensional view illustrating the separated first insulating part and the first current collector.

[0040] Figure 5 It's a diagram. Figure 4 A three-dimensional view of the first manifold connected in the middle.

[0041] Figure 6 It shows Figure 4 Modification of the first insulating part in the process.

[0042] Figure 7 It is a cross-sectional view taken along line AA, where, Figure 6 The first collector plate in the middle is connected.

[0043] Figure 8 It is a cross-sectional view taken along line BB, where, Figure 6 The first collector plate in the middle is connected.

[0044] Figure 9 A modified version of the first manifold is shown.

[0045] Figure 10 This is an exploded perspective view of the current collector assembly of a secondary battery according to a second embodiment of the present disclosure.

[0046] Figure 11 It shows Figure 10 Modification of the collector component in the process.

[0047] Figure 12 This is a perspective view illustrating a first current collector connected to a first insulating portion in a secondary battery according to a third embodiment of the present disclosure.

[0048] Figure 13 It shows Figure 12 Modification of the first insulating part in the process.

[0049] Figure 14 This is a perspective view of a current collector assembly for a secondary battery according to a fourth embodiment of the present disclosure.

[0050] Figure 15 It's a diagram. Figure 14 A plan view of the collector assembly in the circuit.

[0051] Figure 16 It shows Figure 15 Modification of the pressure relief hole in the process.

[0052] Figure 17 It shows Figure 15 Another modification of the pressure relief hole in the design.

[0053] Figure 18 This is a perspective view of a current collector assembly for a secondary battery according to a fifth embodiment of the present disclosure.

[0054] Figure 19 It shows Figure 18 Modification of the collector component in the process.

[0055] Figure 20 The diagram includes Figure 1 A 3D view of the battery module of the secondary battery in the image.

[0056] Figure 21 The diagram includes Figure 20 A 3D view of the battery pack in the battery module. Detailed Implementation

[0057] This disclosure can be modified in various ways and can have many different implementations, and therefore certain implementations will be illustrated and described in detail by way of example. However, it should be understood that this is not intended to limit this disclosure to certain forms of implementation, but rather to include all modifications, equivalents and alternatives that fall within the spirit and scope of this disclosure.

[0058] The terminology used in this disclosure is for the purpose of describing certain embodiments only and is not intended to limit those embodiments. Unless the context clearly requires it, the singular forms include the plural forms. In this disclosure, terms such as “comprising / including” or “having” are intended to expressly describe the presence of features, quantities, steps, operations, components, portions, or combinations thereof described herein, but should not be construed as excluding the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, portions, or combinations thereof.

[0059] As used in this article, the term "longitudinal direction" refers to... Figure 2 The ±x direction in the middle. The term "width direction" refers to... Figure 2 The ±y direction in the equation. The term "height direction" refers to... Figure 2 The ±z direction in the middle.

[0060] Exemplary embodiments will now be described in detail with reference to the accompanying drawings. It should be noted that throughout the drawings, the same reference numerals denote the same components as much as possible. Furthermore, detailed descriptions of known functions and configurations that may obscure the essence of this disclosure will be omitted. For the same reason, some components in the accompanying drawings may be exaggerated, omitted, or schematically illustrated.

[0061] The secondary battery of the first embodiment of this disclosure will be described below.

[0062] Figure 1 This is a perspective view of a secondary battery according to a first embodiment of the present disclosure. Figure 2 It's a diagram. Figure 1 An exploded 3D view of some components of a secondary battery. Figure 3 It is a three-dimensional diagram illustrating the connected electrode contacts.

[0063] Reference Figures 1 to 3 The secondary battery 10 according to the first embodiment of the present disclosure includes: an electrode assembly 300 having a separator 350 inserted between a first electrode 310 and a second electrode 330; a current collector assembly 500 electrically connected to the electrode assembly 300; a housing 100 configured to accommodate the electrode assembly 300; and a cover assembly 700 configured to seal the housing 100.

[0064] The electrode assembly 300 includes a plurality of first electrodes 310, a plurality of second electrodes 330, and a plurality of spacers 350. The electrode assembly 300 can be configured such that the spacers 350 are inserted between alternately arranged first electrodes 310 and second electrodes 330. That is, the spacers 350 can be positioned between the first electrodes 310 and the second electrodes 330, such that the electrode assembly 300 can be formed by alternately stacking the first electrodes 310, spacers 350, second electrodes 330, and spacers 350 in this order. Here, the first electrodes 310 and the second electrodes 330 can serve as positive and negative electrodes, respectively, or conversely, as negative and positive electrodes, respectively, so that the first electrodes 310 and the second electrodes 330 can be electrodes with different polarities.

[0065] The first electrode 310 and the second electrode 330 may each include: electrode active portions 311 and 331, which are areas where active material is coated on a thin plate made of metal foil; and electrode tabs 313 and 333, which are areas where no active material is coated.

[0066] In the first electrode active portion 311, an active material, such as a transition metal oxide, may be coated onto a metal foil, such as aluminum. In the second electrode active portion 331, an active material, such as graphite or carbon, may be coated onto a metal foil, such as copper or nickel.

[0067] The first electrode tab 313 may protrude from one side of the first electrode active portion 311, and the second electrode tab 333 may protrude from one side of the second electrode active portion 331. In this case, the first electrode tab 313 and the second electrode tab 333 may protrude parallel to each other toward the cover assembly 700. Alternatively, the first electrode tab 313 and the second electrode tab 333 may protrude in different directions from each other.

[0068] The first electrode tab 313 and the second electrode tab 333 can be formed by cutting to protrude from the metal foil respectively, 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.

[0069] The first electrode contact 313 and the second electrode contact 333 can be configured to be spaced apart from each other and have different polarities.

[0070] The first electrode contact 313 and the second electrode contact 333 can each be formed by stacking multiple thin films. These thin films can be connected by ultrasonic welding, laser welding, or other methods and made into contact with each other to facilitate current flow.

[0071] The separator 350 is positioned 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 them while allowing ions to move. For example, the separator 350 can be made of a variety of materials such as polyethylene, polypropylene, or a composite film of polyethylene and polypropylene.

[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 stacking the first electrode 310 and the second electrode 330 parallel to each other (stacked type or stacked and folded type).

[0073] The current collector assembly 500 includes: a current collector holder 550, in which a first insulating portion 551, a second insulating portion 553, and a connecting portion 555 configured to connect the first insulating portion 551 and the second insulating portion 553 are integrally formed; a first current collector 510 connected to the first insulating portion 551; and a second current collector 530 connected to the second insulating portion 553. In the current collector assembly 500, the separate current collectors 510 and 530 are connected and integrated via the current collector holder 550, and the current collector assembly 500 is used as a single current collecting component.

[0074] The first insulating portion 551 and the second insulating portion 553 may be made of insulating material and are spaced apart from each other in the longitudinal direction (x direction).

[0075] The connecting portion 555 connects the first insulating portion 551 to the second insulating portion 553. The connecting portion 555 may be made of the same material as the first insulating portion 551 and the second insulating portion 553, i.e., an insulating material. The connecting portion 555 is integrally formed with the first insulating portion 551 and the second insulating portion 553.

[0076] The current collector holder 550 can be formed as a single unit extending in the longitudinal direction (x direction). The current collector holder 550 can be manufactured in a rectangular shape, with its length (x direction) greater than its width (y direction). The length (x direction) of the current collector holder 550 can be equal to or less than the length (x direction) of the electrode assembly 300.

[0077] The manifold retainer 550 is made of an insulating material, such as plastic or silicone rubber. The manifold retainer 550 can be formed by processing the insulating material or by injection molding the insulating material into a mold.

[0078] The current collector holder 550 with insulating properties can connect current collectors 510 and 530 with opposite polarities, so that current collectors 510 and 530 maintain a predetermined distance and can prevent short circuits between electrodes 310 and 330 that are different from each other in the integrated current collector assembly 500.

[0079] The first current collector 510 is connected to the first insulating portion 551, and the second current collector 530 is connected to the second insulating portion 553. A fixing portion 570 is disposed on at least one of the first insulating portion 551 or the first current collector 510, and on at least one of the second insulating portion 553 or the second current collector 530. The first current collector 510 and the second current collector 530 are respectively fixed to the first insulating portion 551 and the second insulating portion 553 by the fixing portion 570.

[0080] The first collector plate 510 and the second collector plate 530 can be arranged on the collector plate holder 550 to be spaced apart from each other in the longitudinal direction (x direction). The first collector plate 510 and the second collector plate 530 can be formed in a rectangular shape, and their width (y direction) is equal to or less than the width of the collector plate holder 550.

[0081] 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 made of 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, and 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.

[0082] The first electrode contact 313 is connected to the upper surface of the first current collector 510, and the second electrode contact 333 is connected to the upper surface of the second current collector 530. The electrode contacts 313 and 333 can be connected to the current collectors 510 and 530 respectively by welding. Welding can include laser welding, ultrasonic welding, etc.

[0083] Multiple first electrode contacts 313 can be provided, and each of the multiple first electrode contacts 313 can be connected to a different first electrode in the first electrode 310. For example... Figure 2 As shown, the plurality of first electrode tabs 313 can be arranged in a single column, or they can be arranged in different columns. That is, the plurality of first electrode tabs 313 may include first foil tab group 313a and second foil tab group 313b arranged in different columns.

[0084] Multiple second electrode contacts 333 may also be provided, and each of the multiple second electrode contacts 333 can be connected to a different second electrode in the second electrode 330. The multiple second electrode contacts 333 may also be arranged in different columns. The multiple second electrode contacts 333 may include a third foil contact group 333a and a fourth foil contact group 333b arranged in different columns.

[0085] The first foil tab group 313a and the second foil tab group 313b can be connected to the upper surface of the first current collector 510. The first foil tab group 313a and the second foil tab group 313b can be bent so that they face each other. Since the first foil tab group 313a and the second foil tab group 313b are arranged in different columns, they can be connected to the upper surface of the first current collector 510 at a position staggered from each other in the width direction (y direction). However, if multiple first electrode tabs 313 are arranged in a single column, instead of in different columns, the multiple first electrode tabs 313 can also be connected to the upper surface of the first current collector 510 at a position where they are stacked together in the width direction (y direction).

[0086] Except that the third foil patch group 333a and the fourth foil patch group 333b are connected to the upper surface of the second current collector 530, the third foil patch group 333a and the fourth foil patch group 333b are the same as the first foil patch group 313a and the second foil patch group 313b described above. Therefore, redundant descriptions of them will be omitted.

[0087] In response to the electrode contacts 313 and 333 being connected to the current collectors 510 and 530, electrodes 310 and 330 can be electrically connected to the current collectors 510 and 530, respectively.

[0088] The first current collector 510 and the second current collector 530 can be connected to the first electrode terminal 710 and the second electrode terminal 730, respectively. In response to the current collectors 510 and 530 being 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.

[0089] In addition, current collectors 510 and 530 can be connected to electrode terminals 710 and 730 respectively via connection terminals 513 and 533.

[0090] A first connection terminal 513 may be formed on the upper surface of the first current collector 510. The first connection terminal 513 may be positioned approximately at the center of the first current collector 510; however, the position of the first connection terminal 513 is not necessarily limited thereto, and the first connection terminal 513 may be positioned offset to one side of the first current collector 510 in the width direction (y-direction). The first connection terminal 513 may be integrally formed with the first current collector 510 in a columnar shape, or may be coupled to the first current collector 510. The first connection terminal 513 may be inserted into the first terminal hole 711, and electrically connect the first current collector 510 to the first electrode terminal 710. In response to the electrical connection between the first current collector 510 and the first electrode terminal 710, the first electrode 310 may be electrically connected to the first electrode terminal 710.

[0091] 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; however, this disclosure is not limited thereto, and the second connection terminal 533 may be positioned offset to one side of the second current collector 530 in the width direction (y-direction). The second connection terminal 533 may be integrally formed with the second current collector 530 in a columnar 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, and electrically connect the second current collector 530 to the second electrode terminal 730. In response to the electrical connection between the second current collector 530 and the second electrode terminal 730, the second electrode 330 may be electrically connected to the second electrode terminal 730.

[0092] 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. Each of the connecting terminals 513 and 533 is integrated in the current collector assembly 500 and is therefore positionally constrained. Thus, in response to the alignment of the first connecting terminal 513 with the first terminal hole 711, the second connecting terminal 533 can also be easily aligned with the second terminal hole 731.

[0093] Therefore, by aligning only one of the connecting terminals 513 or 533 with the corresponding terminal hole, without individually adjusting the positions of the respective connecting terminals 513 and 533, the current collectors 510 and 530 can be connected to the cover assembly 700, allowing the connecting terminals 513 and 533 to be simultaneously aligned with their corresponding terminal holes 711 and 731, respectively. This improves the assembly efficiency between the current collectors 510 and 530 and the cover assembly 700.

[0094] The detailed structure of the collector assembly 500 will be described further later.

[0095] The cover assembly 700 may be configured to seal the opening of the housing 100 in which the electrode assembly 300 is housed, and may include a cover plate 750, a first electrode terminal 710, and a second electrode terminal 730.

[0096] The cover plate 750 may have a plate-like shape that covers the opening of the housing 100. The cover plate 750 may have a shape corresponding to the shape of the opening of the housing 100. The cover plate 750 may be made of the same material as the housing 100, and the cover plate 750 may be fixed to the housing 100 by laser welding.

[0097] The cover plate 750 may include: an electrolyte injection port 770 configured to inject electrolyte; a first terminal hole 711 into which a first connecting terminal 513 is inserted; a second terminal hole 731 into which a second connecting terminal 533 is inserted; and a vent 740 configured to open when the internal pressure of the housing 100 exceeds a predetermined pressure value. However, the location of the vent 740 is not limited thereto, and the vent 740 may be formed on either side of the housing 100, for example, on the side surface or the bottom surface of the housing 100.

[0098] The first electrode terminal 710 and the second electrode terminal 730 can be formed to protrude from the cover plate 750. The first electrode terminal 710 can be electrically connected to the first electrode 310 through the first current collector 510, and the second electrode terminal 730 can be electrically connected to the second electrode 330 through the second current collector 530.

[0099] The first electrode terminal 710 and the second electrode terminal 730 can be formed into a plate shape with a circular or rectangular shape. The first electrode terminal 710 and the second electrode terminal 730 can be connected to a busbar, etc.

[0100] A first terminal insulating element (not shown) may be disposed between the first electrode terminal 710 and the cover plate 750, and insulate the first electrode terminal 710 relative to the cover plate 750. In addition, a second terminal insulating element (not shown) may be disposed between the second electrode terminal 730 and the cover plate 750, and insulate the second electrode terminal 730 relative to the cover plate 750.

[0101] In addition, the cover assembly 700 may also include a top insulator 790 disposed between the current collector assembly 500 and the cover plate 750. The top insulator 790 is a component separate from the current collector assembly 500 and may be attached to the lower surface of the cover plate 750.

[0102] Regarding the top insulator 790, the current collector assembly 500 may be positioned below the top insulator 790, and the cover plate 750 may be positioned above the top insulator 790. The top insulator 790 may be specifically positioned between the current collectors 510 and 530 and the cover plate 750. Regarding the current collectors 510 and 530, a current collector retainer 550 may be disposed below the current collectors 510 and 530, and the top insulator 790 may be disposed above the current collectors 510 and 530. The top insulator 790 insulates the cover plate 750 relative to the current collectors 510 and 530.

[0103] The top insulator 790 may have a shape that covers the entire lower surface of the cover plate 750; however, this disclosure is not necessarily limited thereto, and the top insulator 790 may also be divided into two separate parts, which are respectively formed to correspond to the first current collector 510 and the second current collector 530.

[0104] The housing 100 can form the appearance of the secondary battery 10, have an internal space formed to accommodate the electrode assembly 300, and have an opening formed in one surface. The housing 100 can have a cuboid prism shape and can be made of a robust material capable of protecting the electrode assembly 300 housed within the housing 100. For example, the housing 100 can be made of a metal such as aluminum or stainless steel.

[0105] The electrode assembly 300 and the electrolyte can be housed within the housing 100. The electrolyte may include lithium salts, such as LiPF6 or LiBF4, in organic solvents, such as EC, PC, DEC, EMC, or DMC. The electrolyte may be in liquid, solid, or gel state.

[0106] Furthermore, the battery module M can be configured to include a plurality of secondary batteries 10 according to this embodiment (see Figure 20 Multiple secondary batteries 10 can be connected to each other via bus B, etc., to form battery modules M. Furthermore, the battery pack P can be configured to include multiple battery modules M (see...). Figure 21 The battery pack P can be configured such that multiple battery modules M are disposed within the upper housing VC and lower housing LC forming the housing C. Furthermore, the battery pack P can be disposed in a vehicle transporting luggage, personnel, etc., or performing operations while in motion. Such vehicles can include bicycles, heavy equipment, agricultural or fishing equipment, automobiles, buses, and aircraft. Here, the automobile can be an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle. The automobile can include a four-wheeled or two-wheeled vehicle. The vehicle can receive power from the battery pack P and operate.

[0107] Figure 4 It is a three-dimensional view showing the separation of the first insulating part from the first current collector. Figure 5 The diagram shows... Figure 4 A three-dimensional view of the first manifold connected in the middle.

[0108] In this disclosure, the second insulating portion 553 (see Figure 3 ) and second collector 530 (see Figure 3 The first insulating portion 551 and the first current collector 510 can have the same structure. The following description uses the structure of the first insulating portion 551 and the first current collector 510 as examples, and also describes the second insulating portion 553 (see...). Figure 3 ) and second collector 530 (see Figure 3 Repeated descriptions will be omitted.

[0109] Reference Figure 4 and Figure 5 The first insulating portion 551 may have: a first mounting groove 551a, into which a first current collector 510 is inserted; and a sidewall 551b configured to enclose the first mounting groove 551a.

[0110] The first insulating portion 551 may have a first mounting groove 551a and a sidewall 551b, the first mounting groove 551a being formed at the center and the sidewall 551b being formed at the edge, such that the first insulating portion 551 can be formed to enclose the first mounting groove 551a.

[0111] The first current collector 510 may have the same dimensions as the first mounting groove 551a, and may have a width Wc and a length Lc smaller than the width W and length L of the first insulating portion 551.

[0112] The thickness of the first current collector 510 may be greater than the depth of the first mounting groove 551a. Therefore, the first current collector 510 inserted into the first mounting groove 551a may be configured to protrude upward beyond the first insulating portion 551. However, this disclosure is not limited to this, and the thickness of the first current collector 510 and the depth of the first mounting groove 551a may be the same.

[0113] The fixing portion 570 may be disposed on the first insulating portion 551 or the first current collector 510, and will fix the first current collector 510 to the first insulating portion 551. In particular, the fixing portion 570 may include an upper surface fixing element 571 configured to fix the upper surface of the first current collector 510.

[0114] The upper surface fixing element 571 may be formed at the edge of the first insulating portion 551, i.e., formed on the sidewall 551b. More specifically, the upper surface fixing element 571 may be formed on the upper surface of the sidewall 551b.

[0115] The upper surface fixing element 571 can be formed in a hook shape. The upper surface fixing element 571 can have a hook shape that protrudes upward from the side wall 551b and bends toward the first mounting groove 551a. Therefore, the upper surface fixing element 571 can overlap with the upper surface portion of the first collector plate 510 in the height direction (z direction).

[0116] The first current collector 510 can be inserted into the first mounting groove 551a by pressing against the upper surface fixing element 571. The upper surface fixing element 571 can contact the upper surface of the inserted first current collector 510 and fix the first current collector 510 to the first insulating portion 551.

[0117] The upper surface fixing element 571 may have an inclined hook shape. For example, the upper surface fixing element 571 may have an upper surface inclined in the -z direction and a lower surface with a flat shape. Therefore, the first current collector 510 can be inserted into the first mounting groove 551a by pressing against the upper surface fixing element 571 in the -z direction, and the inserted first current collector 510 can be difficult to detach from the first mounting groove 551a in the +z direction. Thus, even in the event of vibration in the height direction (z direction), the first current collector 510 can be effectively fixed to the first insulating portion 551 without detaching from the first insulating portion 551.

[0118] The upper surface fixing element 571 may include a pair of upper surface fixing elements 571.

[0119] For example, a pair of upper surface fixing elements 571 can be formed on sidewalls 551b facing each other in the width direction (y direction), or they can be formed on sidewalls 551b facing each other in the longitudinal direction (x direction). Alternatively, the upper surface fixing elements 571 can be formed on sidewalls 551b opposite each other in the width direction (y direction) and on sidewalls 551b opposite each other in the longitudinal direction (x direction), and can be formed in multiple pairs.

[0120] A pair of upper surface fixing elements 571 can be configured to face each other. For example, a pair of upper surface fixing elements 571 formed on opposite sidewalls 551b in the longitudinal direction (x direction) can be configured to face each other.

[0121] Conversely, a pair of upper surface fixing elements 571 can also be configured to be offset from each other. For example, a pair of upper surface fixing elements 571 formed on opposite sidewalls 551b in the width direction (y direction) can be configured to be offset from each other. That is, a pair of upper surface fixing elements 571 can be configured to be offset toward one side and the other side in the longitudinal direction (x direction), respectively, instead of facing each other in the width direction (y direction).

[0122] First foil bonding group 313a (see...) Figure 3 ) and the second foil patch group 313b (see Figure 3 The first foil tab group 313a (see [reference]) is arranged in different columns. Therefore, in response to a pair of upper surface fixing elements 571 being arranged to be staggered in the width direction (y-direction), the first foil tab group 313a (see [reference]) is positioned in a different column. Figure 3 ) and the second foil patch group 313b (see Figure 3 It can be easily connected to the upper surface of the first collector plate 510.

[0123] However, this disclosure is not limited thereto. All pairs of upper surface fixing elements 571 may be arranged to face each other or to be offset from each other. Alternatively, upper surface fixing elements 571 on opposite sidewalls 551b in the width direction (y direction) may be arranged to face each other, while upper surface fixing elements 571 on opposite sidewalls 551b in the longitudinal direction (x direction) may be arranged to be offset from each other.

[0124] Figure 6 It shows Figure 4 Modification of the first insulating part in the process. Figure 7 It is a cross-sectional view taken along line AA, where, Figure 6 The first collector plate in the middle is connected. Figure 8 It is a cross-sectional view taken along line BB, where, Figure 6 The first collector plate in the middle is connected.

[0125] like Figure 6As shown, the fixing portion 570 may further include a side surface fixing element 573 configured to press against the side surface of the first current collector 510. The first current collector 510 can be inserted into the first mounting recess 551a such that one side surface of the first current collector 510 can be pressed against the side surface fixing element 573, and thus the first current collector 510 can be fixed to the first insulating portion 551.

[0126] Similar to the upper surface fixing element 571, the side surface fixing element 573 can also be positioned at the edge of the first insulating portion 551. In particular, the side surface fixing element 573 can be formed to protrude from the inner surface of the side wall 551b toward the first mounting groove 551a.

[0127] like Figure 6 As shown, the side surface fixing element 573 can be formed on the sidewall 551b, and the upper surface fixing element 571 is positioned on the sidewall 551b. However, this disclosure is not limited to this, and the side surface fixing element 573 can be formed independently of the position of the upper surface fixing element 571. Furthermore, as... Figure 6 As shown, the first insulating portion 551 may be provided with both the side surface fixing element 573 and the upper surface fixing element 571, or selectively provided with only either the side surface fixing element 573 or the upper surface fixing element 571.

[0128] Reference Figure 7 The side surface fixing element 573 may include a pair of side surface fixing elements 573 disposed on the inner surfaces of the side walls 551b facing each other.

[0129] For example, a pair of side surface fixing elements 573 can be formed to protrude from the inner surfaces of the sidewalls 551b facing each other in the longitudinal direction (x direction). The distance between the pair of side surface fixing elements 573 can be equal to the length Lc of the first current collector 510. Thus, the opposite side surfaces of the first current collector 510 in the longitudinal direction (x direction) can be pressed by the pair of side surface fixing elements 573, so that the first current collector 510 can be fixed to the first insulating portion 551.

[0130] Compared to the side surface fixing elements 573, the distance between a pair of upper surface fixing elements 571 can be shorter than the distance between a pair of side surface fixing elements 573. That is, the upper surface fixing elements 571 can be configured to face the first mounting recess 551a more than the side surface fixing elements 573 (see...). Figure 6 The protrusion extends further. Therefore, a pair of side surface fixing elements 573 can fix the opposite side surface of the first collector plate 510, and a pair of upper surface fixing elements 571 can fix the upper surface of the first collector plate 510.

[0131] like Figure 8 As shown, a pair of side surface fixing elements 573 can be formed on the inner surfaces of the sidewall 551b that face each other in the width direction (y direction). In this case, the distance between the pair of side surface fixing elements 573 can be equal to the width Wc of the first current collector 510. Therefore, the opposite side surfaces of the first current collector 510 in the width direction (y direction) can be pressed by the pair of side surface fixing elements 573, so that the first current collector 510 can be fixed to the first insulating portion 551. In this case, the pair of side surface fixing elements 573 can be arranged to face each other or can be arranged to be offset from each other.

[0132] The first collector plate 510 can have a smaller size than the first mounting groove 551a. That is, the width Wc and length Lc of the first collector plate 510 can be smaller than the width and length of the first mounting groove 551a. Therefore, a gap can exist between the first mounting groove 551a and the first collector plate 510.

[0133] The side surface fixing element 573 can fill the gap and press the opposite side surfaces of the first current collector 510 in the longitudinal direction (x direction) or the width direction (y direction). Thus, even if vibration occurs in the longitudinal direction (x direction) or the width direction (y direction), the first current collector 510 can be effectively fixed to the first insulating portion 551 without detaching from the first insulating portion 551.

[0134] Figure 9 A modified version of the first manifold is shown.

[0135] Reference Figure 9 The first collector plate 510 can be formed having a first mounting groove 511 corresponding to the side surface fixing element 573. The first mounting groove 511 can be formed in relation to the side surface fixing element 573 (see... Figure 8 The first mounting groove 511 may have a concave shape, which corresponds to the side surface fixing element 573 (see...). Figure 8 The first collector plate 510 can be mounted on a side surface fixing element 573 (see...). Figure 8 ) is fitted into the first fitting groove 511 to be fixed to the first insulating part 551 (see Figure 8 ).

[0136] In this case, the width Wc' and length Lc' of the first collector plate 510 can be equal to the first mounting groove 551a (see...). Figure 8 The width and length of the first collector plate 510. That is, in this case, the first collector plate 510 can be formed to have a groove corresponding to the first mounting recess 551a (see...). Figure 8The dimensions and shape of the first collector plate 510 are the same as those of the first mounting recess 551a (see [reference]). Figure 8 No gaps may be formed between them. Therefore, the first current collector 510 can be prevented from vibrating in both the longitudinal (x-direction) and width (y-direction) directions, and can be more reliably fixed to the first insulating portion 551 (see...). Figure 8 ).

[0137] In addition, return to reference Figure 6 The fixing portion 570 may also include an adhesive element (not shown) inserted between the first insulating portion 551 and the first current collector 510.

[0138] An adhesive element (not shown) may be attached to the lower surface of the first current collector 510 or the upper surface of the first insulating portion 551, and more particularly, to the bottom surface of the first mounting groove 551a. The adhesive element (not shown) may be, for example, an adhesive liquid or adhesive tape. The adhesive element (not shown) can secure the first current collector 510 to the first insulating portion 551.

[0139] According to this embodiment and its modifications, the first current collector 510 can be fixed to the first insulating portion 551 in a simple manner, thereby improving the production efficiency of the current collector assembly 500, and even in the event of vibration in multiple directions, the first current collector 510 can be effectively fixed to the first insulating portion 551 without detaching from the first insulating portion 551.

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

[0141] Figure 10 This is an exploded perspective view of the current collector assembly of a secondary battery according to a second embodiment of the present disclosure.

[0142] The secondary battery according to the second embodiment of this disclosure has the same structure as the first embodiment and its modifications, except for the structure of the first insulating portion 551 and the fixing portion 570. Therefore, redundant descriptions of repeated components will be omitted.

[0143] like Figure 10 As shown, the first insulating portion 551 can be formed in a flat shape. The first insulating portion 551 may not be formed with a separate mounting groove and may have a flat upper surface. The first current collector 510 can be placed on the flat upper surface of the first insulating portion 551.

[0144] The side surface fixing element 573 can be positioned at the edge of the first insulating portion 551 and can be formed to protrude from the upper surface of the first insulating portion 551.

[0145] A pair of side surface fixing elements 573 may be formed, and the pair of side surface fixing elements 573 may be spaced apart from each other in the longitudinal direction (x direction) and formed at opposite edges in the longitudinal direction (x direction) of the first insulating portion 551.

[0146] A pair of side surface fixing elements 573 can be configured to face each other or be offset from each other in the longitudinal direction (x direction), and the first collector plate 510 can be fixed between the pair of side surface fixing elements 573. For this purpose, the distance between the pair of side surface fixing elements 573 can be equal to the length Lc of the first collector plate 510.

[0147] Furthermore, when a pair of side surface fixing elements 573 are arranged along the longitudinal direction (x direction), the width Wc of the first current collector 510 can be equal to the width W of the first insulating portion 551.

[0148] A pair of side surface fixing elements 573 can fix the first current collector 510 to the first insulating portion 551 by pressing the opposite side surfaces of the first current collector 510 in the longitudinal direction (x direction). Therefore, even in the event of vibration in the longitudinal direction (x direction), the first current collector 510 can be effectively fixed to the first insulating portion 551 without detaching from the first insulating portion 551.

[0149] The upper surface fixing element 571 may also be positioned at the edge of the first insulating portion 551 and may be positioned on the upper ends of a pair of side surface fixing elements 573. The upper surface fixing element 571 may be coupled to the side surface fixing element 573, or alternatively, may be integrally formed with the side surface fixing element 573.

[0150] As described above, the upper surface fixing element 571 can be formed in a hook shape. This upper surface fixing element 571 can have a hook shape, with an upper surface inclined in the -z direction and a flat lower surface. Therefore, the first current collector 510 can be inserted between a pair of side surface fixing elements 573 by pressing against the upper surface fixing element 571 in the -z direction, and the inserted first current collector 510 is difficult to detach in the +z direction. Thus, even in the event of vibration in the height direction (z direction), the first current collector 510 can be effectively fixed to the first insulating portion 551 without detaching from it.

[0151] In this embodiment, when a first insulating portion 551 with a flat shape is used, it is not necessary to form a separate groove in the first insulating portion 551, thereby simplifying the manufacturing process.

[0152] Figure 11 It shows Figure 10 Modification of the collector component in the process.

[0153] Reference Figure 11 A pair of side surface fixing elements 573 and a pair of top surface fixing elements 571 can be arranged along the width direction (y direction) of the first insulating portion 551.

[0154] For example, a pair of side surface fixing elements 573 may be formed at opposite edges of the first insulating portion 551 in the width direction (y direction). The pair of side surface fixing elements 573 may be arranged to face each other in the width direction (y direction), or they may be arranged to be offset from each other.

[0155] The first current collector 510 can be fitted and fixed between a pair of side surface fixing elements 573 spaced apart from each other in the width direction (y direction). Therefore, even in the event of vibration in the width direction (y direction), the first current collector 510 can be effectively fixed to the first insulating portion 551 without detaching from the first insulating portion 551.

[0156] A pair of upper surface fixing elements 571 may be formed on the upper ends of a pair of side surface fixing elements 573. The upper surface fixing elements 571 can fix the upper surface of the first current collector 510 so that the first current collector 510 fitted between the pair of side surface fixing elements 573 will not detach in the +z direction. Therefore, even in the event of vibration in the height direction (z direction), the first current collector 510 can be effectively fixed to the first insulating portion 551 without detaching from the first insulating portion 551.

[0157] The following describes a secondary battery according to a third embodiment of the present disclosure.

[0158] Figure 12 This is a perspective view illustrating a first current collector connected to a first insulating portion in a secondary battery according to a third embodiment of the present disclosure. Figure 13 It shows Figure 12 Modification of the first insulating part in the process.

[0159] The secondary battery according to the third embodiment of this disclosure has the same structure as the first embodiment and its variations, except for the structure of the first insulating portion 551. Therefore, redundant descriptions of repeating components will be omitted.

[0160] Reference Figure 12 The side surface of the first insulating portion 551 can be formed as a curved surface. In particular, the outer surface of the first insulating portion 551 opposite in the width direction (y direction) can be formed as a convex curved surface.

[0161] For example, the outer surface of the first insulating portion 551 in the -y direction can be a curved surface that is convex in the -y direction, and the outer surface of the first insulating portion 551 in the +y direction can be a curved surface that is convex in the +y direction.

[0162] In this embodiment, the width W of the first insulating portion 551 can be greater than the width Wc of the first current collector 510. Therefore, the first foil patch group 313a and the second foil patch group 313b can be bent along opposite outer surfaces of the first insulating portion 551 in the width direction (y direction) and connected to the upper surface of the first current collector 510.

[0163] In other words, the first foil patch group 313a and the second foil patch group 313b can be guided along the side surface of the first insulating portion 551. In this case, since the opposite outer surfaces of the first insulating portion 551 in the width direction (y direction) are formed as smooth curved surfaces, the first foil patch group 313a and the second foil patch group 313b can be smoothly bent, thereby reducing the risk of short circuits. Therefore, the electrical stability of the secondary battery 10 can be improved.

[0164] In addition, such as Figure 13 As shown, when the width W of the first insulating portion 551 is equal to the width Wc of the first current collector 510, the lower surface of the first insulating portion 551 and the outer surface opposite in the width direction (y direction) can be formed as a single curved surface. That is, the bottom surface of the first insulating portion 551 and the outer surface opposite in the width direction (y direction) can be integrally formed into a downwardly convex curved surface.

[0165] like Figure 12 As shown, the first foil patch group 313a and the second foil patch group 313b can be smoothly bent along the opposite outer surfaces of the first insulating portion 551, thereby reducing the risk of short circuits.

[0166] The secondary battery according to the fourth embodiment of this disclosure will be described below.

[0167] Figure 14 This is a perspective view illustrating the current collector assembly of a secondary battery according to the fourth embodiment of this disclosure. Figure 15 It's a diagram. Figure 14 A plan view of the collector assembly in the circuit. Figure 16 It shows Figure 15 Modification of the pressure relief hole in the process. Figure 17 It shows Figure 15 Another modification of the pressure relief hole in the design.

[0168] The secondary battery according to the fourth embodiment of this disclosure has the same structure as the first embodiment and its modifications, except for the pressure relief hole 556. Therefore, redundant descriptions of repeated components will be omitted.

[0169] like Figure 14 and Figure 15 As shown, the pressure relief hole 556 can be formed in the connection portion 555 configured to connect the first insulating portion 551 and the second insulating portion 553.

[0170] Pressure relief port 556 can be positioned below exhaust port 740. In housing 100 (see...) Figure 3 The gas expanding inside can be discharged to the outside through the pressure relief hole 556 and along the exhaust hole 740. Therefore, the collector assembly 500 can discharge gas through the pressure relief hole 556 to the exhaust hole 740 without obstructing gas flow, thus preventing the housing 100 (see...) from being discharged to the outside. Figure 3 An internal explosion occurred, and the stability of the secondary battery 10 was improved.

[0171] It can be formed with only a single pressure relief hole 556, or as... Figure 15 As shown, multiple pressure-reducing holes 556 are formed. With multiple pressure-reducing holes 556, the structural rigidity of the connecting portion 555 can be improved compared to a single pressure-reducing hole 556. Therefore, the connecting portion 555 can more firmly support and connect the first insulating portion 551 and the second insulating portion 553.

[0172] In addition, pressure relief hole 556 is Figure 14 and Figure 15 The image is shown as having a rectangular shape, but it can also have a shape like... Figure 17 The honeycomb shape shown, or other shapes such as triangles or circles that enhance structural rigidity.

[0173] The following describes a secondary battery according to a fifth embodiment of the present disclosure.

[0174] Figure 18 This is a perspective view of a current collector assembly for a secondary battery according to a fifth embodiment of the present disclosure. Figure 19 It shows Figure 18 Modification of the collector component in the process.

[0175] The secondary battery according to the fifth embodiment of this disclosure has the same structure as the fourth embodiment and its modifications, except for the first rib 557 and the second rib 558. Therefore, redundant descriptions of repeated components will be omitted.

[0176] Reference Figure 18 The manifold retainer 550 may also include a first rib 557 and a second rib 558.

[0177] In this embodiment, the width W1 of the connecting portion 555 can be greater than the width W of the first insulating portion 551. Therefore, the connecting portion 555 can be configured to protrude further than the first insulating portion 551 in the width direction (y direction).

[0178] A first rib 557 may be formed on a side surface of the connecting portion 555. The first rib 557 can connect a side surface of the connecting portion 555 to a side surface of the first insulating portion 551 in the width direction (y direction) and support the connecting portion 555 and the first insulating portion 551.

[0179] For example, the first rib 557 can be formed in a triangular shape, configured to connect the side surface of the connecting portion 555 in the -x direction to the side surface of the first insulating portion 551 in the +y direction. The first rib 557 can be configured to be horizontally placed (horizontal rib) with the first insulating portion 551 and connected to the connecting portion 555, or as... Figure 19 As shown, it can be configured to stand vertically (vertical rib) relative to the first insulating portion 551 and be connected to the connecting portion 555.

[0180] The first rib 557 can support the first insulating portion 551 and thus prevent deformation of the first insulating portion 551. For example, by supporting the first insulating portion 551, the first rib 557 can prevent deformation of the first insulating portion 551 due to vibration, torsion, etc. Therefore, the first connecting terminal 513 can connect to the first terminal hole 711 (see...). Figure 3 It ensures precise alignment and also prevents the first insulating part 551 from breaking.

[0181] A second rib 558 may be formed on the opposite side of the first rib 557, wherein the connecting portion 555 is inserted between them. The second rib 558 may connect the remaining side surface of the connecting portion 555 to the remaining side surface of the second insulating portion 553 in the width direction (y direction) and support the connecting portion 555 and the second insulating portion 553.

[0182] For example, a second rib 558 may be formed between the side surface of the connecting portion 555 in the +x direction and the side surface of the second insulating portion 553 in the -y direction. That is, the second rib 558 may be positioned diagonally relative to the first rib 557, and the second rib 558 may be formed in a diagonally symmetrical manner with respect to the connecting portion 555 and the first rib 557.

[0183] The second rib 558 is the same as the first rib 557, and can be formed in a triangular shape. It is also the same as the first rib 557, and can be formed in a horizontal or vertical direction.

[0184] The second rib 558 can support the second insulating portion 553 and thus prevent deformation of the second insulating portion 553. For example, by supporting the second insulating portion 553, the second rib 558 can prevent deformation of the second insulating portion 553 due to vibration, torsion, etc. Therefore, the second connecting terminal 533 can connect with the second terminal hole 731 (see...). Figure 3 It ensures precise alignment and also prevents the second insulating part 553 from breaking.

[0185] According to this embodiment and its modification, the first rib 557 and the second rib 558 can prevent deformation of the current collector assembly 500, thereby reducing misalignment of the connection terminals 513 and 533, and preventing breakage of the first insulating portion 551 and the second insulating portion 553.

[0186] Although embodiments of this disclosure have been described above, those skilled in the art can make various modifications and alterations to this disclosure by adding, modifying, replacing, deleting, or supplementing components without departing from the spirit of this disclosure as set forth in the claims. Such modifications and alterations should also be understood to fall within the scope of the claims of this disclosure.

Claims

1. A secondary battery, the secondary battery comprising: A current collector assembly includes: a current collector holder in which a first insulating portion, a second insulating portion, and a connecting portion configured to connect the first insulating portion and the second insulating portion are integrally formed; a first current collector connected to the first insulating portion and having a first connecting terminal; a second current collector connected to the second insulating portion and having a second connecting terminal; and a fixing portion configured to fix the first current collector to the first insulating portion. A plurality of first electrode contacts are connected to the upper surface of the first current collector; A plurality of second electrode contacts are connected to the upper surface of the second current collector; and A cover assembly, the cover assembly including a first electrode terminal connected to the first current collector and a second electrode terminal connected to the second current collector.

2. The secondary battery according to claim 1, wherein, The first insulating portion includes: A first mounting groove, wherein the first collector plate is inserted into the first mounting groove; and The sidewall is configured to enclose the first mounting groove.

3. The secondary battery according to claim 2, wherein, The fixing part includes an upper surface fixing element formed on the upper surface of the sidewall and configured to fix the upper surface of the first collector plate.

4. The secondary battery according to claim 3, wherein, The upper surface fixing element has a hook shape.

5. The secondary battery according to claim 3, wherein, The upper surface fixing element includes a pair of upper surface fixing elements disposed on the mutually facing portions of the sidewall.

6. The secondary battery according to claim 5, wherein, The pair of upper surface fixing elements are arranged to face each other.

7. The secondary battery according to claim 5, wherein, The pair of upper surface fixing elements are arranged to be staggered from each other.

8. The secondary battery according to claim 2, wherein, The fixing part includes a side surface fixing element formed on the inner surface of the side wall and configured to press the side surface of the first collector plate.

9. The secondary battery according to claim 8, wherein, The side surface fixing element includes a pair of side surface fixing elements disposed on the inner surfaces of the portions of the sidewall facing each other.

10. The secondary battery according to claim 1 or 2, wherein, The fixing part includes an adhesive element inserted between the first insulating part and the first current collector.

11. The secondary battery according to claim 1 or 2, wherein, The width of the first insulating portion is greater than the width of the first current collector.

12. The secondary battery according to claim 1, wherein, The fixing portion includes a pair of side surface fixing elements formed on the upper surface of the first insulating portion and configured to press against the opposite side surface of the first current collector.

13. The secondary battery according to claim 12, wherein, The fixing part also includes an upper surface fixing element, which is positioned on the upper end of the side surface fixing element and is formed in a hook shape.

14. The secondary battery according to any one of claims 1 to 9, wherein, The side surface of the first insulating portion is a curved surface.

15. The secondary battery according to any one of claims 1 to 9, wherein, The connecting portion is formed with a pressure relief hole.

16. The secondary battery according to claim 15, wherein, The pressure relief hole includes multiple pressure relief holes.

17. The secondary battery according to any one of claims 1 to 9, wherein, The current collector retainer further includes a first rib formed between the side surface of the first insulating portion and the connecting portion, and configured to support the first insulating portion.

18. The secondary battery according to claim 17, wherein, The current collector retainer further includes a second rib formed between the side surface of the second insulating portion and the connecting portion, and configured to support the second insulating portion, wherein the second rib is formed diagonally symmetrical with respect to the first rib.

19. The secondary battery according to any one of claims 1 to 9, wherein, The plurality of first electrode tabs include a first foil tab group and a second foil tab group, wherein the first foil tab group and the second foil tab group are arranged in different columns from each other.

20. The secondary battery according to claim 19, wherein, The first foil bonding group and the second foil bonding group are bent so that they face each other.

21. The secondary battery according to any one of claims 1 to 9, wherein, The cover assembly further includes a cover plate having a first terminal hole and a second terminal hole, wherein the first connecting terminal is inserted into the first terminal hole and the second connecting terminal is inserted into the second terminal hole.

22. The secondary battery according to claim 21, wherein, The cover assembly also includes a top insulator disposed between the current collector assembly and the cover plate.

23. The secondary battery according to claim 21, 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.

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