Secondary battery and battery pack having same

Abstract

A secondary battery according to an embodiment of the present invention comprises: a cylindrical can having an open end; an electrode assembly including a first electrode plate having a plurality of first substrate tabs, a second electrode plate having a plurality of second substrate tabs, and a separator interposed between the first electrode plate and the second electrode plate, the electrode assembly being wound and accommodated in the can; a cap plate coupled to the open end of the can and having at least one notch on a plate surface; and a terminal insulatively coupled to the cap plate and electrically connected to the first substrate tabs. According to an embodiment of the present invention, a loss of space inside the secondary battery can be reduced by eliminating the cap plate provided at the lower portion of the secondary battery and a sealed molding space for forming same. Accordingly, dead space in the secondary battery is reduced, and capacity can be increased. In addition, as the lower structure of the secondary battery is improved, there is no space that acts as an insulating layer when the lower portion is cooled, and thus the lower portion of the secondary battery can be efficiently cooled.

Description

Secondary battery and battery pack having the same

[0001] An embodiment of the present invention relates to a secondary battery and a battery pack having the same.

[0002] Secondary batteries, unlike non-rechargeable primary batteries, are rechargeable and dischargeable. Low-capacity secondary batteries are used in small, portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for motor drives and power storage in hybrid and electric vehicles. These secondary batteries include an electrode assembly comprising a positive and negative electrode, a case housing the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] The above-described information disclosed in the background technology of this invention is only intended to improve understanding of the background of the present invention, and therefore may include information that does not constitute prior art.

[0004] An embodiment of the present invention provides a secondary battery having a structure capable of reducing loss of internal space and efficiently cooling the lower portion.

[0005] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0006] A secondary battery according to an embodiment of the present invention may include a cylindrical can having one end opened; an electrode assembly including a first electrode plate having a plurality of first substrate tabs, a second electrode plate having a plurality of second substrate tabs, and a separator interposed between the first electrode plate and the second electrode plate, the electrode assembly being wound and accommodated in the can; a cap plate coupled to the opened end of the can and having at least one notch provided on a plate surface; and a terminal insulatively coupled to the cap plate and electrically connected to the first substrate tab.

[0007] The above notch may be provided on a plate surface facing the electrode assembly.

[0008] The above notch may be provided on a plate surface facing the opposite direction of the electrode assembly.

[0009] The above notch is characterized by multiple individuals.

[0010] A notch provided on a plate facing the electrode assembly and a notch provided on a plate facing the opposite direction of the electrode assembly may be arranged to face each other.

[0011] The notches provided on the plate surface facing the electrode assembly and the notches provided on the plate surface facing the opposite direction of the electrode assembly may be arranged to be staggered from each other.

[0012] The cap plate may have a circular shape and include a flat portion connected to the can and a protrusion formed integrally with the flat portion and protruding in a direction toward or opposite to the electrode assembly.

[0013] The above notch may be provided on the above protrusion.

[0014] The above terminal may be provided on the above protrusion.

[0015] The can may include a circular lower portion and a side portion extending upward from the lower portion, and may include a catch provided at an end of the side portion to which the flat portion of the cap plate is secured.

[0016] The above-mentioned obstacle is characterized by being either a diagonal slope, a streamlined slope, or a stepped shape.

[0017] The cap plate may further include a stepped portion provided on the edge of the flat portion and having a shape corresponding to the shape of the catch.

[0018] It may include a first insulating member disposed between the terminal and the cap plate to insulate the terminal and the cap plate.

[0019] The above first insulating member may be a GTMS (Glass To Metal Seal).

[0020] The above first insulating member may be provided integrally with the terminal.

[0021] The above terminal may be provided with a liquid outlet communicating with the inside of the can.

[0022] The above-mentioned injection port can be closed by at least one of a ball, pin, or plate-shaped terminal cap.

[0023] The first substrate tab is a positive tab arranged toward the positive terminal, and the second substrate tab can be arranged in an opposite direction to the first substrate tab.

[0024] The can further includes a positive electrode current collector plate disposed between the first substrate tab and the positive electrode terminal and electrically connected to the first substrate tab and the positive electrode terminal, and the can can be electrically connected to the second substrate tab.

[0025] The first substrate tab and the second substrate tab each have a fan-shaped shape and can be spaced apart from each other and arranged toward the cap plate.

[0026] A first collector plate having a first connection area of ​​a first collector plate electrically connected to the first substrate tab, a first collector plate connection area bent and extended from the first collector plate first connection area toward the cap plate, a first collector plate second connection area integrally provided in the first collector plate connection area and parallel to the first collector plate first connection area and electrically connected to the positive terminal; and a second collector plate having a first connection area of ​​a second collector plate electrically connected to the second substrate tab, a second collector plate connection area bent and extended from the second collector plate first connection area toward the cap plate, and a second collector plate second connection area integrally provided in the second collector plate connection area and parallel to the second collector plate first connection area and electrically connected to the cap plate.

[0027] The first substrate tab and the second substrate tab may have a circular ring shape, and the first substrate tab may extend from the center of the electrode assembly toward the cap plate, and the second substrate tab may extend from the outside of the first substrate tab toward the cap plate.

[0028] A first collector plate having a first connection area of ​​a first collector plate electrically connected to the first substrate tab, a first collector plate connection area bent and extended from the first collector plate first connection area toward the cap plate, a first collector plate second connection area integrally provided in the first collector plate connection area and parallel to the first collector plate first connection area and electrically connected to the positive terminal; and a second collector plate having a first connection area of ​​a second collector plate electrically connected to the second substrate tab, a second collector plate connection area bent and extended from the second collector plate first connection area toward the cap plate, and a second collector plate second connection area integrally provided in the second collector plate connection area and parallel to the second collector plate first connection area and electrically connected to the cap plate.

[0029] An insulating plate may further be included between the first collector plate and the second collector plate to insulate the first collector plate and the second collector plate.

[0030] In addition, an embodiment of the present invention can provide a battery pack including a plurality of secondary batteries according to any one of claims 1 to 25; a case accommodating the secondary batteries; a bus bar electrically connected to the secondary batteries; and a circuit module electrically connected to the bus bar.

[0031] The above battery pack may further include a cooling unit adjacent to or in contact with the lower portion of the secondary battery to cool the secondary battery.

[0032] According to an embodiment of the present invention, the internal space loss of the secondary battery can be reduced by eliminating the cap plate provided at the bottom of the secondary battery and the sealed molding space for configuring the cap plate. Accordingly, the dead space of the secondary battery can be reduced, thereby increasing its capacity.

[0033] In addition, as the lower structure of the secondary battery is improved, the space that acts as an insulating layer when cooling the lower part is eliminated, so the lower part of the secondary battery can be cooled efficiently.

[0034] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0035] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0036] Figure 1 is a perspective view of a secondary battery according to one embodiment of the present invention.

[0037] Figure 2 is a partial perspective view of the secondary battery according to Figure 1.

[0038] Figure 3a is a cross-sectional view of a secondary battery according to Figure 2.

[0039] FIGS. 3b to 3g are drawings illustrating various examples of notches according to embodiments of the present invention.

[0040] FIGS. 4 and 5 are partial cross-sectional views showing the upper portion of a secondary battery according to embodiments of the present invention.

[0041] FIG. 6a is a schematic diagram schematically illustrating an electrode assembly according to another embodiment of the present invention.

[0042] Fig. 6b is a plan view illustrating a current collector applied to the electrode assembly of Fig. 6a.

[0043] Fig. 6c is a cross-sectional view illustrating a secondary battery according to Figs. 6a and 6b.

[0044] FIG. 7a is a schematic diagram schematically illustrating an electrode assembly according to another embodiment of the present invention.

[0045] Fig. 7b is a plan view illustrating a current collector applied to the electrode assembly of Fig. 7a.

[0046] Fig. 7c is a cross-sectional view illustrating a secondary battery according to Figs. 7a and 7b.

[0047] FIG. 8 is a cross-sectional view illustrating a positive terminal and a cap plate according to another embodiment of the present invention.

[0048] FIGS. 9 and 10 are perspective views illustrating a battery pack including an exemplary secondary battery according to the present invention.

[0049] FIGS. 11 and 12 are perspective and side views illustrating a vehicle including an exemplary battery pack according to the present invention.

[0050] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms or words used in this specification and claims should not be interpreted as limited to their typical or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of a term to best explain his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as substitutes for them at the time of filing this application.

[0051] Additionally, when used herein, the terms "comprise", "include" and / or "comprising", "including" specify the presence of stated features, numbers, steps, operations, elements, elements and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, elements and / or groups thereof.

[0052] Additionally, to facilitate understanding of the invention, the attached drawings may not be drawn to scale and some components may be exaggerated in size. Furthermore, identical components may be assigned the same reference numbers in different embodiments.

[0053] The statement that two compared objects are "identical" means "substantially identical." Therefore, "substantially identical" may include deviations considered low in the art, such as deviations of less than 5%. Furthermore, uniformity of a parameter over a given region may imply uniformity on average.

[0054] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0055] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0056] Any configuration being placed on (or below) a component or above (or below) a component may mean not only that any configuration is placed in contact with the upper surface (or lower surface) of the component, but also that another configuration may be interposed between the component and any configuration placed on (or below) the component.

[0057] Additionally, when it is described that a component is connected, coupled, or connected to another component, it should be understood that the components may be directly connected or coupled to one another, but that other components may be interposed between the components, or that each component may be connected, coupled, or connected through another component. Furthermore, when it is said that a part is electrically coupled to another part, this includes not only cases where they are directly connected, but also cases where they are connected with another element in between.

[0058] When reference is made throughout the specification to A and / or B, this means A, B, or A and B, unless otherwise stated. That is, and / or includes all or any combination of the listed items. When reference is made to C through D, this means C or more and D or less, unless otherwise stated.

[0059] The terminology used herein is for the purpose of describing embodiments of the present disclosure and is not intended to be limiting of the present disclosure.

[0060] Hereinafter, secondary batteries according to embodiments of the present invention will be described in detail with reference to the attached drawings.

[0061] FIG. 1 is a perspective view of a secondary battery according to one embodiment of the present invention. FIG. 2 is a partial perspective view of the secondary battery according to FIG. 1. FIG. 3a is a cross-sectional view of the secondary battery according to FIG. 2. FIGS. 3b to 3g are drawings illustrating various examples of notches according to embodiments of the present invention. FIGS. 4 and 5 are partial cross-sectional views illustrating the upper portion of a secondary battery according to embodiments of the present invention.

[0062] Referring to FIGS. 1 to 4, a secondary battery (10) according to an embodiment of the present invention may include a can (100), an electrode assembly (200), a positive electrode collector plate (300), a rivet plate (400), a positive electrode terminal (500), a first insulating member (600), and a second insulating member (700).

[0063] Referring to FIGS. 1 to 3, a can (100) constitutes the outer shape of a secondary battery (10) and may have a cylindrical shape with one end opened. The can (100) may include or be referred to as a case, a housing, or an outer material. The can (100) may include a lower portion (110) in a circular shape and a side portion (120) in a cylindrical shape extending upward from the lower portion (110). The lower portion (110) is closed, and the upper portion of the side portion (120) is open. A rivet plate (400) may be coupled to the upper end of the opened side portion (120). For coupling the rivet plate (400), a catch (122) may be provided at the upper end of the side portion (120). The catch (122) may be any one of an inclined surface, a streamlined inclined surface, and a stepped shape. In this embodiment, the explanation is based on an example in which the upper part of the can (100) is open, but conversely, the lower part of the can (100) may be open.

[0064] The can (100) may be provided with a metal such as steel, nickel-plated steel, steel alloy, aluminum, aluminum alloy, deep drawing cooling sheet (SPCE), or a laminate film or plastic material constituting the pouch. An electrode assembly (200) is accommodated inside the can (100) together with an electrolyte.

[0065] The electrode assembly (200) may include or be referred to as an electrode group, an electrode body, or a jelly roll. Referring to FIGS. 2 and 3, the electrode assembly (200) may include a first electrode plate, a second electrode plate, and a separator (230).

[0066] The first electrode plate may be either a negative electrode plate or a positive electrode plate. The first electrode plate may include a first substrate, which is a metal thin plate, a first active material layer provided on at least one surface of the first substrate, and a first non-coated portion on which the first active material is not provided. The first non-coated portion may be referred to as the first substrate. The first non-coated portion may be notched in a certain shape to serve as the first substrate tab (210). Alternatively, the first non-coated portion itself may serve as the first substrate tab (210) without being notched. In the embodiments of FIGS. 1 to 5, the first substrate tab (210) protrudes upward from the separator (230) and may be electrically connected to the positive electrode current collector (300), which will be described later, without a separate notch. For example, the connection method may be laser welding, etc.

[0067] For example, the first electrode plate may function as an anode. The first substrate may include aluminum foil, and the first active material layer may include a transition metal oxide.

[0068] In some examples, a compound capable of reversible intercalation and deintercalation of lithium (a lithiated intercalation compound) may be used as the cathode active material. Specifically, one or more of a composite oxide of lithium and a metal selected from the group consisting of cobalt, manganese, nickel, and combinations thereof may be used.

[0069] The above composite oxide may be a lithium transition metal composite oxide, and specific examples thereof include lithium nickel-based oxide, lithium cobalt-based oxide, lithium manganese-based oxide, lithium iron phosphate-based compound, cobalt-free nickel-manganese-based oxide, or a combination thereof.

[0070] As an example, a compound represented by any one of the following chemical formulas may be used. LiaA1-bXbO2-cDc(0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); LiaMn2-bXbO4-cDc(0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); LiaNi1-b-cCobXcO2-D(0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<<2); LiaNi1-b-cMnbXcO2-D(0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<<2); LiaNibCocL1dGeO2(0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); LiaNiGbO2(0.90≤a≤1.8, 0.001≤b≤0.1); LiaCoGbO2(0.90≤a≤1.8, 0.001≤b≤0.1); LiaMn1-bGbO2 (0.90≤a≤1.8, 0.001≤b≤0.1); LiaMn2GbO4 (0.90≤a≤1.8, 0.001≤b≤0.1); LiaMn1-gGgPO4 (0.90=a=1.8, 0=g=0.5); Li(3-f)Fe2(PO4)3(0=f=2); LiaFePO4(0.90=a=1.8).

[0071] In the chemical formula, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L1 is Mn, Al, or a combination thereof.

[0072] A positive electrode for a lithium secondary battery may include a current collector (e.g., a first substrate) and a positive electrode active material layer formed on the current collector. The positive electrode active material layer includes a positive electrode active material and may further include a binder and / or a conductive material.

[0073] The content of the positive electrode active material may be 90 wt% to 99.5 wt% with respect to 100 wt% of the positive electrode active material layer, and the contents of the binder and conductive material may be 0.5 wt% to 5 wt%, respectively, with respect to 100 wt% of the positive electrode active material layer.

[0074] Aluminum may be used as the current collector, but is not limited thereto.

[0075] The second electrode plate may be the other of the negative electrode plate and the positive electrode plate. The second electrode plate may include a second substrate which is a metal sheet, a second active material layer provided on at least one surface of the second substrate, and a second non-coated portion where the second active material layer is not provided. The second non-coated portion may be referred to as the second substrate. The second non-coated portion may be notched in a certain shape to serve as the second substrate tab (220). Alternatively, the second non-coated portion itself may serve as the second substrate tab (220) without being notched. In the embodiments of FIGS. 1 to 5, the second substrate tab (220) protrudes downward from the separator (230) and may be electrically connected to the lower surface (110) of the can (100) without a separate notch. For example, the connection method may be laser welding, etc.

[0076] For example, the second electrode plate may function as a cathode. The second substrate may include copper or nickel foil, and the second active material layer may include a carbon-based material, Si, Sn, tin oxide, a tin alloy composite, a transition metal oxide, lithium metal nitrite, or a metal oxide.

[0077] The negative electrode active material includes a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0078] The material capable of reversibly intercalating / deintercalating the lithium ions may include a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of the crystalline carbon include graphite such as natural graphite or artificial graphite, and examples of the amorphous carbon include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, and the like.

[0079] As the material capable of doping and dedoping the lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material can be used. The Si-based negative electrode active material can be silicon, a silicon-carbon composite, SiOx (0 < x < 2), a Si-based alloy, or a combination thereof.

[0080] The above silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0081] The silicon-carbon composite may further comprise crystalline carbon. For example, the silicon-carbon composite may comprise a core comprising crystalline carbon and silicon particles and an amorphous carbon coating layer positioned on the surface of the core.

[0082] A negative electrode for a lithium secondary battery may include a current collector (e.g., a second substrate) and a negative electrode active material layer formed on the current collector. The negative electrode active material layer includes a negative electrode active material and may further include a binder and / or a conductive material.

[0083] For example, the negative electrode active material layer may include 90 to 99 wt% of the negative electrode active material, 0.5 to 5 wt% of the binder, and 0 to 5 wt% of the conductive material.

[0084] The above binder may be a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof. When an aqueous binder is used as the negative electrode binder, a cellulose-based compound capable of imparting viscosity may be further included.

[0085] The current collector may be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and a combination thereof.

[0086] A separator (230) is interposed between the first electrode plate and the second electrode plate and serves to prevent a short circuit between the first electrode plate and the second electrode plate. The separator may include a porous substrate and a coating layer comprising an organic material, an inorganic material, or a combination thereof located on one or both sides of the porous substrate.

[0087] The above organic material may include a polyvinylidene fluoride-based antibody or a (meth)acrylic polymer.

[0088] The above inorganic materials are Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, It may include inorganic particles selected from, but not limited to, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof.

[0089] The organic and inorganic substances may be mixed and present in one coating layer, or a coating layer including an organic substance and a coating layer including an inorganic substance may be present in a laminated form.

[0090] An electrolyte for a lithium secondary battery may include a non-aqueous organic solvent and a lithium salt.

[0091] The non-aqueous organic solvent acts as a medium through which ions involved in the electrochemical reaction of the battery can move. The non-aqueous organic solvent may be a carbonate-based, ester-based, ether-based, ketone-based, or alcohol-based solvent, an aprotic solvent, or a combination thereof, and may be used alone or in combination of two or more.

[0092] Additionally, when using a carbonate solvent, a mixture of cyclic carbonate and chain carbonate can be used.

[0093] For example, the electrode assembly (200) may be arranged so that the first substrate tab (210) of the first electrode plate protrudes upward from the upper end of the second electrode plate. In addition, the second substrate tab (220) of the second electrode plate may be arranged so as to protrude downward from the lower end of the first electrode plate and may be wound in a jelly-roll shape. In this state, the positive electrode collector plate (300) may be welded to the first substrate tab (210), and the lower surface (110) of the can (100) may be welded to the second substrate tab (220). Alternatively, the second substrate tab (220) may be welded to a separate negative electrode lead or negative electrode collector plate, and then the negative electrode lead or negative electrode collector plate may be welded to the lower surface (110) of the can (100).

[0094] Additionally, the electrode assembly (120) may have a substantially hollow central region. This hollow central region is also referred to as a core (240). A cylindrical center pin (optional) may be inserted into the core (240) for support. The core (240) may serve as a passage through which pressure is released when the internal pressure of the secondary battery (10) exceeds a reference pressure. In some examples, when internal pressure is applied to the rivet plate (400) through the core (240), the notch (410) may be broken, thereby reducing the internal pressure of the secondary battery (10).

[0095] As illustrated in FIG. 2, the positive electrode collector plate (300) may be disposed between the second insulating member (700) to be described later and the first substrate tab (210). More specifically, the positive electrode collector plate (300) may be welded to the first substrate tab (210) by being in contact with it. The positive electrode collector plate (300) may have an approximately circular shape. The positive electrode collector plate (300) may be electrically connected to the positive electrode terminal (500) at its central portion. To this end, the positive electrode collector plate (300) may have a shape in which a certain area in the center protrudes convexly toward the positive electrode terminal (500). A hollow portion may be provided at the center of the positive electrode collector plate (300). Since the positive electrode collector plate (300) must be insulated from the can (100), an insulating tape (not illustrated) may be attached to an area other than the area connected to the positive electrode terminal (500). Since the positive terminal (500) is installed on the rivet plate (400), the rivet plate (400) will be described first.

[0096] Referring to FIGS. 2 to 4, the rivet plate (400) may have a roughly circular shape. The rivet plate (400) may be provided with a notch (410). In addition, a step (420) may be provided on the lower edge of the rivet plate (400) for seating on a catch (122).

[0097] The notch (410) functions as a safety vent that ruptures and discharges gas when the gas pressure inside the secondary battery (10) increases. As shown in Fig. 3a, the notch (410) may be provided on a plate surface facing the electrode assembly (200). Alternatively, as shown in Fig. 3b, the notch (410) may be provided on a plate surface facing the opposite direction of the electrode assembly (200). Alternatively, as shown in Fig. 3c, the notches (410) may be provided on both sides of the rivet plate (400), or may be provided in multiple numbers. When multiple notches (410) are provided, those provided on the plate surface facing the electrode assembly (200) and those provided on the plate surface facing the opposite direction of the electrode assembly (200) may be arranged to face each other or to be staggered. In addition, the notches (410) may have various shapes. For example, as shown in FIG. 3d, the notch (410) may have a ring shape when viewed from a plan view. Or, as shown in FIG. 3e, it may have a partial ring shape such as a C shape. Or, as shown in FIG. 3f or FIG. 3g, the notch (410) may have a discontinuous linear shape. For example, the notch (410) may be provided as two non-connected streamlined shapes (see FIG. 3f) or as multiple non-connected streamlined shapes (see FIG. 3g). The shape of the notch (410) described above may be provided at a position that avoids interference with the bus bar when configuring a battery module with the secondary battery (10) according to the present embodiment. In addition, the shape of the notch (410) described above may also be variously changed to avoid interference with the bus bar. The area where the notch (410) is formed may have a concave shape closer to the electrode assembly (200) than the edge area of ​​the rivet plate (400). Alternatively, the area where the notch (410) is formed may have a convex shape that is directed away from the electrode assembly (200). For convenience, a certain area of ​​the edge of the disc-shaped rivet plate (400) may be referred to as a flat area. An area that is convex in one or the other direction compared to the flat area may be referred to as a protrusion for convenience.A notch is provided on the above protrusion, a hollow is formed in the center, and a positive electrode terminal (500) to be described later can be inserted into the hollow.

[0098] The step portion (420) is a portion that is mounted on the upper end of the side portion (120) of the can (100). That is, the step portion (420) can be mounted on a catch (122) provided on the side portion (120) of the can (100). Therefore, the step portion (420) can have a shape corresponding to the shape of the catch (122). In a state where the step portion (420) is mounted on the catch (122), the edge of the rivet plate (400) can be welded to the side portion (120) of the can (100). Accordingly, the open end of the can (100) is closed.

[0099] Referring to FIGS. 2 to 4, the positive terminal (500) may include a body (510) inserted into the can (100), a head (520) positioned outside the can (100), and a flange (530) formed by deforming the lower end of the body (510). For example, the positive terminal (500) may be a rivet terminal that is riveted from the outside of the can (100) while the body (510) is inserted into the can (100). When riveted, the lower end of the body (510) of the positive terminal (500) may be deformed to become a flange (530). The flange (530) may extend from the lower end of the body (510) of the positive terminal (500) toward the lower end of the rivet plate (400). A filler port (522) may be provided at the center of the positive terminal (500) through the head (520) and the body (510). The filler port (522) connects the positive terminal (500) and the inside of the can (100). An electrolyte may be injected into the inside of the can (100) through the filler port (522). The positive terminal (500) may be insulated from the rivet plate (400) by the first insulating member (600).

[0100] Referring to FIG. 4, a first insulating member (600) can be disposed between the rivet plate (400) and the positive terminal (500) to insulate them therebetween. The first insulating member (600) can be disposed between the head (520) of the positive terminal (500) and the upper surface of the rivet plate (400), between the body (510) of the positive terminal (500) and the hollow portion of the rivet plate (400), and between the flange (530) of the positive terminal (500) and the lower surface of the rivet plate (400). A plurality of first insulating members (600) can be disposed at each of the aforementioned positions, or can be connected as one. The lower region of the first insulating member (600) that insulates between the flange (530) of the positive terminal (500) and the lower surface of the rivet plate (400) can have a length that covers the entire lower surface of the rivet plate (400). However, the first insulating member (600) may have a shorter length in the lower region and may additionally include a second insulating member (700).

[0101] Referring to Fig. 4, the second insulating member (700) can be arranged between the rivet plate (400) and the positive electrode collector plate (300) to insulate them. The second insulating member (700) has a roughly circular shape and may have a hollow portion. If necessary, the second insulating member (700) may have a concave shape in some areas toward the electrode assembly (200). Some areas of the second insulating member (700) adjacent to the hollow portion can be inserted between the flange (530) of the positive electrode terminal (500) and the rivet plate (400).

[0102] Hereinafter, a manufacturing process of the secondary battery (10) described above will be described. First, an electrode assembly (200) may be inserted into a can (100). At this time, a positive electrode collector plate (300) may be coupled to the electrode assembly (200). Thereafter, a positive electrode terminal (500) may be coupled to a rivet plate (400) via a first insulating member (600). Before the rivet plate (400) is fixed, a second insulating member (700) may be inserted, and the rivet plate (400) and the can (100) may be welded. Thereafter, an electrolyte may be injected through the injection port (522) of the positive electrode terminal (500). The positive electrode terminal (500) and the positive electrode collector plate (300) may be laser welded inside the injection port (522) as shown in FIG. 4. The welding area is indicated by A in FIG. 4. After that, a separate pin or ball (800) can be inserted to close the injection port (522). After that, a terminal cap (500a) made of the same material as the positive terminal (500) can be welded to the head (520) of the positive terminal (500). The welding area is illustrated as B in FIG. 5. Here, the ball (800) may be omitted. The terminal cap (500a) may have the same size as the head (520) of the positive terminal (500). A step or flange (510a) is provided along the edge of the terminal cap (500a), and welding between the positive terminal (500) and the terminal cap (500a) can be performed in the step or flange (510a) area. The step or flange (510a) area may have a smaller thickness than other areas of the terminal cap (500a).

[0103] According to the structure described above, the first electrode plate, which is a positive electrode, is electrically connected to the positive current collector plate (300) and the positive terminal (500). The second current collector plate, which is a negative electrode, is electrically connected to the lower surface (110) of the can (100). The lower surface (110) of the can (100) is integral with the side surface (120), and the side surface (120) is coupled to the rivet plate (400). Since the can (100) is electrically connected to the second current collector plate, the rivet plate (400) also has a negative polarity. Therefore, both the positive electrode and the negative electrode can be arranged on the upper surface of the secondary battery (10). In addition, a separate cap plate is not provided on the lower surface of the secondary battery (10), and the lower surface (110) is directly connected to the second substrate tab (220) of the second electrode plate. Therefore, compared to a structure in which a cap plate is provided at the bottom of the secondary battery (10), this structure has no dead space. Therefore, the capacity of the secondary battery can be increased as the dead space is reduced. In addition, when a cooling unit is provided at the bottom of the secondary battery (10) when configuring a battery module, the bottom of the secondary battery (10) can be arranged to be directly in contact with or adjacent to the cooling unit. Therefore, the cooling performance of the secondary battery (10) can be improved. In the case of a structure in which a cap plate is provided, there may be a problem in which the internal space at the bottom of the secondary battery functions as an insulating material, thereby hindering cooling. However, since the secondary battery (10) according to the present embodiment has no dead space at the bottom, the cooling performance of the secondary battery (10) is improved.

[0104] In the embodiment of the secondary battery (10) described above, the electrode assembly (200) has been described as having a structure in which the first substrate tab (210) is positioned at the top and the second substrate tab (220) is positioned at the bottom. However, various types of electrode assemblies can be applied to the structure of the secondary battery described above. Hereinafter, electrode assemblies according to other embodiments and current collector structures therefor will be described.

[0105] Fig. 6a is a schematic diagram schematically illustrating an electrode assembly according to another embodiment of the present invention. Fig. 6b is a plan view illustrating a current collector applied to the electrode assembly of Fig. 6a. Fig. 6c is a cross-sectional view illustrating a secondary battery according to Figs. 6a and 6b (reference numbers illustrated in Figs. 6a to 6c apply only to the corresponding embodiments, and descriptions of features identical to those of the aforementioned embodiments are omitted).

[0106] Referring to FIGS. 6A to 6C, the secondary battery (100) according to the present embodiment may have a plurality of first substrate tabs (1211) and a plurality of second substrate tabs (1221) provided by notching the positive electrode non-conductive portion and the negative electrode non-conductive portion, all of which may be arranged on the upper side of the electrode assembly (200). The structure of the case (110) is the same as that of the can (100) of the embodiment of FIGS. 1 to 5, and thus a detailed description thereof will be omitted.

[0107] The electrode assembly (120) may include a first electrode plate (121) (e.g., a positive electrode plate), a second electrode plate (122) (e.g., a negative electrode plate), and a separator (123). In some examples, the first electrode plate (121) (e.g., a positive electrode plate), the separator (123), and the second electrode plate (122) (e.g., a negative electrode plate) may be rolled into a generally cylindrical shape while being stacked. The first electrode plate (121) may include a plurality of first substrate tabs (1211) extending upwardly. The second electrode plate (122) may include a plurality of second substrate tabs (1221) extending upwardly. The first substrate tabs (1211) may be electrically connected to the first current collector plate (131) and the terminal (140) (e.g., a rivet terminal). The second substrate tab (1221) can be electrically connected to a terminal (110) (e.g., a case).

[0108] The separator (123) is formed to be slightly wider than the widths of the first electrode plate (121) and the second electrode plate (122), so that it can protrude further in the upper, lower, left, and right directions than the first electrode plate (121) and the second electrode plate (122), respectively. Therefore, the separator (123) can prevent the first electrode plate (121) and the second electrode plate (122) from directly contacting the case (110) in the upper, lower, and / or left, right directions of the electrode assembly (120). In some examples, the separator (123) can protrude and extend a certain length in the upper and lower directions of the electrode assembly (120) without the first substrate tab (1211) and the second substrate tab (1221).

[0109] The collector plate assembly (130) may include a first collector plate (131) and a second collector plate (132). The collector plate assembly (130) may further include an insulating plate (133).

[0110] The first current collector plate (131) can electrically connect the first electrode plate (121) of the electrode assembly (120) and the rivet terminal (140). The first current collector plate (131) may include or be referred to as a current collector, a conductor, or a conductive lead. The first current collector plate (131) may be made of aluminum or an aluminum alloy. For example, the first current collector plate (131) may include a first current collector plate first connection area (1311), a first current collector plate connection area (1312), and a first current collector plate second connection area (1313). The first current collector plate first connection area (1311) may be electrically connected to a plurality of first substrate tabs (1211) by a method such as laser welding. The first current collector plate connection area (1312) may be bent and extended upward from the first current collector plate first connection area (1311). The first collector plate second connection area (1313) can be bent and extended from the first collector plate connection area (1312) and electrically connected to the rivet terminal (140) by a method such as laser welding. In this way, the first collector plate (131) can serve as a current flow path between the electrode assembly (120) and the rivet terminal (140).

[0111] The second collector plate (132) can electrically connect the second electrode plate (122) of the electrode assembly (120) and the case (110) (e.g., the rivet plate (111)). The second collector plate (132) may include or be referred to as a current collector, a conductor, or a conductive lead. The second collector plate (132) may be made of copper, a copper alloy, nickel, or a nickel alloy. The second collector plate (132) may be made by a punching process using a die and a punch on a metal plate, or may be made by casting a molten metal. In some examples, the second collector plate (132) may include a second collector plate first connection area (1321), a second collector plate connection area (1322), and a second collector plate second connection area (1323). The second collector plate first connection area (1321) can be electrically connected to the plurality of second substrate tabs (1221) described above by a method such as laser welding. The second collector plate connection area (1322) can be bent and extended upward from the second collector plate first connection area (1321). The second collector plate second connection area (1323) can be bent and extended from the second collector plate connection area (1322) and electrically connected to the rivet plate (111) by a method such as laser welding. In this way, the second collector plate (132) can become a current flow path between the electrode assembly (120) and the case (110).

[0112] An insulating plate (133) may be interposed between the first collector plate (131) and the second collector plate (132). In some examples, a portion of the insulating plate (133) may be interposed between the first collector plate first connection area (1311) and the second collector plate second connection area (1323), thereby preventing the first collector plate (131) and the second collector plate (132) from electrically shorting each other. In some examples, a portion of the insulating plate (133) may be interposed between the second collector plate second connection area (1323) and the electrode assembly (120). The insulating plate (133) may include or be referred to as an insulator, an insulating block, or an insulating phaser. The insulating plate (133) may be made of polypropylene, polyethylene, EPDM, or nylon, which do not react with the electrolyte. In some examples, the first collector plate (131), the second collector plate (132), and the insulating plate (133) can be manufactured through a double injection molding method.

[0113] The rivet terminal (140) may be coupled by penetrating the case (110). In some examples, the rivet terminal (140) may be coupled by penetrating a terminal hole (1111) provided in the rivet plate (111). In some examples, an insulating gasket (1431) may be interposed between the rivet terminal (140) and the terminal hole (1111). In some examples, the rivet terminal (140) may include a head portion (141) and a body portion (142) extending downward from the head portion (141). In some examples, the rivet terminal (140) may further include a recess (1411) provided at a predetermined depth from the head portion (141) toward the body portion (142). The rivet terminal (140) and the first collector plate (131) may be laser welded to each other through the recess (1411). In some examples, an upper insulator (1432) may be further interposed between the head portion (141) and the rivet plate (111). In some examples, a lower insulator (1433) may be further interposed around the body portion (142) penetrating the rivet plate (111). In some examples, the lower insulator (1433) may be interposed between the collector assembly (130) and the rivet plate (111). Since the lower insulator (1433) has the same function as the second insulating member (700) of the above-described embodiment, it may be replaced with the second insulating member (700). In some examples, the recess (1411) may be finished with a generally flat member (e.g., metal) after the welding process. In some examples, the metal member may be joined to the recess (1411) or may close the top of the recess (1411) after the welding process.

[0114] The electrode assembly (120) of the above-described structure can provide a secondary battery (100) with low electrical resistance and a short current path, since the first substrate tab (1211) and the second substrate tab (1221) are provided in the same direction. In addition, the first current collector plate (131) and the second current collector plate (132) are three-dimensionally bonded and provided in the same area, so that they occupy a small volume in the internal space of the case (110), thereby providing a secondary battery (100) in which a relatively large electrode assembly (120) is accommodated inside the case (110).

[0115] Fig. 7a is a schematic diagram schematically illustrating an electrode assembly according to another embodiment of the present invention. Fig. 7b is a plan view illustrating a current collector applied to the electrode assembly of Fig. 7a. Fig. 7c is a cross-sectional view illustrating a secondary battery according to Figs. 7a and 7b (reference numbers illustrated in Figs. 7a to 7c apply only to the corresponding embodiments, and descriptions of features identical to those of the aforementioned embodiments are omitted).

[0116] Referring to FIGS. 7A to 7C, in the secondary battery (100) according to the present embodiment, a plurality of first substrate tabs (1211) and second substrate tabs (1221) provided by notching the positive electrode non-conductive portion and the negative electrode non-conductive portion can all be arranged on the upper side of the electrode assembly (200). The structure of the case (110) is the same as that of the can (100) of the embodiment of FIGS. 1 to 5, and thus a detailed description thereof will be omitted.

[0117] The electrode assembly (120) may include a first electrode plate (121) (e.g., a positive electrode plate), a second electrode plate (122) (e.g., a negative electrode plate), and a separator (123). In some examples, the first electrode plate (121) (e.g., a positive electrode plate), the separator (123), and the second electrode plate (122) (e.g., a negative electrode plate) may be rolled in a substantially cylindrical shape while being stacked. The first electrode plate (121) may include a first substrate tab (1211) extending upward from approximately the center of the electrode assembly (120). The second electrode plate (122) may include a second substrate tab (1221) extending upward from approximately the periphery of the electrode assembly (120). The first substrate tab (1211) can be electrically connected to the first collector plate (131) and the terminal (140) (e.g., a rivet terminal). The second substrate tab (1221) can be electrically connected to the terminal (110) (e.g., a case).

[0118] The separator (123) is formed to be slightly wider than the widths of the first electrode plate (121) and the second electrode plate (122), so that it can protrude further in the upper, lower, left, and right directions than the first electrode plate (121) and the second electrode plate (122), respectively. Therefore, the separator (123) can prevent the first electrode plate (121) and the second electrode plate (122) from directly contacting the case (110) in the upper, lower, and / or left, right directions of the electrode assembly (120). In some examples, the separator (123) can protrude and extend a certain length in the upper and lower directions of the electrode assembly (120) without the first substrate tab (1211) and the second substrate tab (1221).

[0119] The collector plate assembly (130) may include a first collector plate (131) and a second collector plate (132). The collector plate assembly (130) may further include an insulating plate (133).

[0120] The first collector plate (131) can electrically connect the first electrode plate (121) of the electrode assembly (120) and the rivet terminal (140). For example, the first collector plate (131) can include a first collector plate first connection area (1311), a first collector plate connection area (1312), and a first collector plate second connection area (1313). The first collector plate first connection area (1311) can be electrically connected to the first substrate tab (1211) having a roughly circular ring shape described above by a method such as laser welding. The first collector plate connection area (1312) can be bent and extended upward from the first collector plate first connection area (1311). The first collector plate second connection area (1313) can be bent and extended from the first collector plate connection area (1312) and electrically connected to the rivet terminal (140) by a method such as laser welding. In this way, the first collector plate (131) can serve as a current flow path between the electrode assembly (120) and the rivet terminal (140).

[0121] The second collector plate (132) can electrically connect the second electrode plate (122) of the electrode assembly (120) and the case (110) (e.g., the rivet plate (111)). For example, the second collector plate (132) can include a second collector plate first connection area (1321), a second collector plate connection area (1322), and a second collector plate second connection area (1323). The second collector plate first connection area (1321) can be electrically connected to the second substrate tab (1221) having a roughly circular ring shape described above by a method such as laser welding. The second collector plate connection area (1322) can be bent and extended upward from the second collector plate first connection area (1321). The second collector plate second connection area (1323) can be bent and extended from the second collector plate connection area (1322) and electrically connected to the rivet plate (111) by a method such as laser welding. In this way, the second collector plate (132) can become a current flow path between the electrode assembly (120) and the case (110).

[0122] An insulating plate (133) may be interposed between the first collector plate (131) and the second collector plate (132). In some examples, the insulating plate (133) may be provided on a substantially same horizontal plane as the first collector plate (131) and the second collector plate (132). In some examples, a portion of the insulating plate (133) may be interposed between the second connection area (1323) of the second collector plate and the electrode assembly (120).

[0123] The rivet terminal (140) has the same structure as the rivet terminal (140) of the aforementioned FIG. 6C, and thus a detailed description thereof will be omitted. The rivet terminal (140) may be laser welded to the second connection area (1313) of the first current collector (131) through the recess (1411). As in the aforementioned embodiment, a lower insulator (1433) may be further interposed around the body portion (142) penetrating the rivet plate (111). Since the lower insulator (1433) has the same function as the second insulating member (700) of the aforementioned embodiment, it may be replaced with the second insulating member (700).

[0124] The electrode assembly (120) of the above-described structure can provide a secondary battery (100) with low electrical resistance and a short current path, since the first substrate tab (1211) and the second substrate tab (1221) are provided in the same direction. In addition, the first current collector plate (131) and the second current collector plate (132) are three-dimensionally bonded and provided in the same area, so that they occupy a small volume in the internal space of the case (110), thereby providing a secondary battery (100) in which a relatively large electrode assembly (120) is accommodated inside the case (110).

[0125] Meanwhile, the aforementioned embodiments described a configuration in which an insulating member or gasket made of insulating material is interposed between the positive terminal or rivet terminal and the cap plate. However, the aforementioned insulating member or gasket may be implemented in other configurations.

[0126] FIG. 8 is a cross-sectional view illustrating a positive terminal and a cap plate according to another embodiment of the present invention.

[0127] Referring to Fig. 8, a cap plate (400') of a secondary battery according to another embodiment of the present invention is provided with a positive terminal (500'). A glass to metal seal (GTMS, 600') is interposed between the positive terminals (500') of the cap plate (400'). A notch (410') is provided in the cap plate (400'), and a connecting portion (430') is provided between the cap plate (400') and the GTMS (600').

[0128] GTMS (600') is provided for insulation and sealing, similar to the insulating material or gasket described above. GTMS (600') can be manufactured as an integral part with the cap plate (400') and the positive terminal (500') in some manufacturing processes of secondary batteries. The cap plate (400') and positive terminal (500') structure to which GTMS (600') is applied can be provided together with various types of electrode assemblies described above.

[0129] The secondary battery according to the above-described embodiment can be used to manufacture a battery pack (reference numbers of the components described below are reference numbers that apply only to the corresponding drawing).

[0130] FIGS. 9 and 10 are perspective views illustrating a battery pack (300) including an exemplary cylindrical secondary battery according to the present invention. Referring to FIGS. 9 and 10, the battery pack (300) may include a plurality of battery modules (200) and a housing (310) for accommodating the plurality of battery modules (200). For example, the housing (310) may include first and second housings (311, 312) that are coupled in a direction facing each other with the plurality of battery modules (200) interposed therebetween. The plurality of battery modules (210) may be electrically connected to each other using a bus bar (251), and the plurality of battery modules (200) may be electrically connected to each other in a series / parallel or series-parallel hybrid manner to obtain a required electrical output. A cooling unit for cooling may be provided at the bottom of the plurality of battery modules (200). For example, the cooling unit may be provided in various forms, such as a heat dissipation member including a heat dissipation fin, a heat dissipation plate, a water-cooled cooling unit, an air-cooled cooling unit, etc. In the drawing, for convenience of illustration, components such as a bus bar for electrical connection of battery cells, a cooling unit, and an external terminal are omitted. In some examples, the battery pack (300) may be mounted on a vehicle. The vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle may include a four-wheel vehicle or a two-wheel vehicle.

[0131] Figures 11 and 12 are perspective views and side views illustrating a vehicle (400, 500) including an exemplary battery pack (300) according to the present invention. In Figure 11, the battery pack (300) may include a battery pack cover (311) (which may correspond to the first housing) which is a part of a vehicle underbody (410) and a pack frame (312) (which may correspond to the second housing) which is disposed at a lower portion of the vehicle underbody (410). The battery pack cover (311) and the pack frame (312) may be formed integrally with the vehicle floor (420). The vehicle underbody (410) separates the interior and exterior of the vehicle, and the pack frame (312) may be disposed at the exterior of the vehicle.

[0132] As illustrated in FIG. 12, a vehicle (500) may be formed by combining additional components, such as a hood (510) at the front of the vehicle and fenders (520) positioned at the front and rear of the vehicle, respectively, with a body (400). The vehicle (500) includes a battery pack (300) including a battery pack cover (311) and a pack frame (312), and the battery pack (300) may be combined with a body component (400).

[0133] The above description is only one embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, it will be said that the technical spirit of the present invention exists to the extent that anyone with ordinary skill in the art to which the present invention pertains can make various modifications without departing from the gist of the present invention.

Claims

1. A cylindrical can with one end open; An electrode assembly comprising a first electrode plate having a plurality of first substrate tabs, a second electrode plate having a plurality of second substrate tabs, and a separator interposed between the first electrode plate and the second electrode plate, and which is wound and accommodated in the can; A rivet plate coupled to the opened end of the can and having at least one notch on the plate surface; and A secondary battery comprising a terminal insulatively connected to the rivet plate and electrically connected to the first substrate tab.

2. In paragraph 1, A secondary battery, wherein the above notch is provided on a plate facing the electrode assembly.

3. In paragraph 1, A secondary battery, wherein the notch is provided on a plate facing in the opposite direction of the electrode assembly.

4. In paragraph 1, The above notch is a multiple individual, secondary battery.

5. In paragraph 4, A secondary battery in which a notch provided on a plate facing the electrode assembly and a notch provided on a plate facing the opposite direction of the electrode assembly are arranged to face each other.

6. In paragraph 4, A secondary battery in which notches provided on a plate facing the electrode assembly and notches provided on a plate facing the opposite direction of the electrode assembly are arranged in an alternating manner.

7. In paragraph 1, A secondary battery, wherein the rivet plate has a circular shape and includes a flat portion connected to the can and a protrusion formed integrally with the flat portion and protruding in a direction toward or opposite to the electrode assembly.

8. In paragraph 7, A secondary battery, wherein the above notch is provided in the above protrusion.

9. In paragraph 7, A secondary battery, wherein the terminal is provided on the protrusion.

10. In paragraph 7, A secondary battery, wherein the can includes a circular lower portion and a side portion extending upward from the lower portion, and includes a catch provided at an end of the side portion and on which the flat portion of the rivet plate is secured.

11. In paragraph 10, The secondary battery wherein the above-mentioned obstacle is one of a diagonal slope, a streamlined slope, and a step shape.

12. In paragraph 11, A secondary battery, wherein the rivet plate is provided on the edge of the flat portion and further includes a stepped portion having a shape corresponding to the shape of the catch.

13. In paragraph 9, A secondary battery comprising a first insulating member disposed between the terminal and the rivet plate to insulate the terminal and the rivet plate.

14. In paragraph 13, A secondary battery wherein the above first insulating material is GTMS (Glass To Metal Seal).

15. In paragraph 14, A secondary battery, wherein the first insulating member is provided integrally with the terminal.

16. In paragraph 1, A secondary battery, wherein the terminal is provided with a liquid port communicating with the inside of the can.

17. In paragraph 16, A secondary battery, wherein the above-mentioned charging port is closed by at least one of a ball, pin, and plate-shaped terminal cap.

18. In paragraph 9, A secondary battery, wherein the first substrate tab is a positive tab arranged toward the positive terminal, and the second substrate tab is a negative tab arranged in the opposite direction to the first substrate tab.

19. In paragraph 18, A secondary battery further comprising a positive electrode current collector plate disposed between the first substrate tab and the positive electrode terminal and electrically connected to the first substrate tab and the positive electrode terminal, wherein the can is electrically connected to the second substrate tab.

20. In paragraph 9, A secondary battery, wherein the first substrate tab and the second substrate tab each have a fan shape, are spaced apart from each other, and are arranged toward the rivet plate.

21. In paragraph 21, A first collector plate having a first connection area of ​​the first collector plate electrically connected to the first substrate tab, a first collector plate connection area bent and extended from the first collector plate first connection area toward the rivet plate, and a first collector plate second connection area integrally provided in the first collector plate connection area and parallel to the first collector plate first connection area and electrically connected to the positive terminal; and A secondary battery further comprising a second collector plate having a first connection area of ​​a second collector plate electrically connected to the second substrate tab, a second collector plate connection area that is bent and extended from the first connection area of ​​the second collector plate toward the rivet plate, and a second collector plate second connection area that is integrally provided in the second collector plate connection area and is parallel to the first connection area of ​​the second collector plate and electrically connected to the rivet plate.

22. In paragraph 9, A secondary battery, wherein the first substrate tab and the second substrate tab have a circular ring shape, the first substrate tab extending from the center of the electrode assembly toward the rivet plate, and the second substrate tab extending from the outside of the first substrate tab toward the rivet plate.

23. In paragraph 22, A first collector plate having a first connection area of ​​the first collector plate electrically connected to the first substrate tab, a first collector plate connection area bent and extended from the first collector plate first connection area toward the rivet plate, and a first collector plate second connection area integrally provided in the first collector plate connection area and parallel to the first collector plate first connection area and electrically connected to the positive terminal; and A secondary battery further comprising a second collector plate having a first connection area of ​​a second collector plate electrically connected to the second substrate tab, a second collector plate connection area that is bent and extended from the first connection area of ​​the second collector plate toward the rivet plate, and a second collector plate second connection area that is integrally provided in the second collector plate connection area and is parallel to the first connection area of ​​the second collector plate and electrically connected to the rivet plate.

24. In paragraph 21, A secondary battery further comprising an insulating plate interposed between the first current collector plate and the second current collector plate to insulate the first current collector plate and the second current collector plate.

25. In paragraph 23, A secondary battery further comprising an insulating plate interposed between the first current collector plate and the second current collector plate to insulate the first current collector plate and the second current collector plate.

26. A plurality of secondary batteries according to any one of paragraphs 1 to 25; A case that accommodates the secondary battery; A bus bar electrically connected to the secondary battery; and A battery pack comprising a circuit module electrically connected to the above bus bar.

27. In paragraph 26, A battery pack further comprising a cooling unit adjacent to or in contact with the lower portion of the secondary battery to cool the secondary battery.

Images