Secondary battery

Abstract

The present disclosure relates to a secondary battery, and provides a secondary battery capable of preventing a short circuit and thermal runaway from occurring due to contact between a positive electrode current collector plate and a case. To this end, the present disclosure includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case accommodating the electrode assembly; a positive electrode current collector plate in contact with a first tab provided on the first electrode plate; a positive electrode terminal electrically connected to the positive electrode current collector plate and extending to the outside of the case; and an insulating part coupled to the outer edge of the positive electrode current collector plate and configured to block electrical connection between the case and the positive electrode current collector plate.

Description

secondary battery

[0001] The present disclosure relates to a secondary battery.

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly.

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

[0004] The present invention provides a secondary battery capable of preventing a short circuit that may occur due to cell deformation during compression or collision of a circular battery.

[0005] In addition, the present invention provides a secondary battery capable of preventing short circuits and thermal runaways caused by contact between the positive current collector plate and the case.

[0006] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems can be clearly understood by those skilled in the art from the description of the invention below.

[0007] An exemplary secondary battery according to one embodiment of the present invention for solving the above technical problem comprises: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case housing the electrode assembly; a positive current collector plate in contact with a first tab provided on the first electrode plate; a positive terminal electrically connected to the positive current collector plate and extending to the outside of the case; and an insulating part coupled to the outer edge of the positive current collector plate and blocking the electrical connection between the case and the positive current collector plate.

[0008] In some examples, at least one of the upper and lower surfaces of the insulating part may form a plane with the outer surface of the positive current collector plate.

[0009] In some examples, the upper surface of the insulating part may form a plane with the upper surface of the positive current collector plate.

[0010] In some examples, the lower surface of the insulating part may form a plane with the lower surface of the anode current collector plate.

[0011] In some examples, the positive current collector may include a current collector body electrically connected to a first tab and a positive terminal, and a coupling member protruding from an end of the current collector body and extending into the interior of an insulating part.

[0012] In some examples, the thickness of the collector plate body may be greater than the thickness of the connecting member.

[0013] In some examples, the collector plate body may include a terminal connection part installed in contact with a positive terminal, a electrode plate connection part spaced apart from the terminal connection part and located on the outside of the terminal connection part and connected to a first tap, and a fuse part connecting the electrode plate connection part and the terminal connection part.

[0014] In some examples, the coupling member may include a coupling body extending circumferentially along the perimeter of the collector plate body and a coupling projection protruding upward and downward from the coupling body and engaging with the inner side of the insulating part.

[0015] In some examples, the insulating member may include a first insulating support member that supports the lower side of the coupling member, a first insulating connecting member that extends upward from the first insulating support member and faces the end of the coupling member, and a first insulating cover member that extends horizontally from the first insulating connecting member and is located on the upper side of the coupling member.

[0016] In some examples, the upper surface of the first insulating cover member and the upper surface of the current collector body may be located on the same plane.

[0017] In some examples, the lower side of the first insulating support member and the lower side of the collector plate body may be located on the same plane.

[0018] In some examples, the first insulating support member may be provided with a plurality of holes penetrating the first insulating support member in the vertical direction.

[0019] In some examples, the first insulating cover member may be provided with a plurality of holes penetrating the first insulating cover member in the vertical direction.

[0020] In some examples, the insulating member may further include a coupling groove portion formed by creating a groove on the inner surface of the first insulating support member and the first insulating cover member, so as to be coupled with a coupling projection protruding from the coupling member.

[0021] In some examples, the insulating member may further include a safety projection protruding upward from the first insulating cover member.

[0022] An exemplary secondary battery according to one embodiment of the present invention for solving the above technical problem comprises: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case housing the electrode assembly; a positive current collector plate in contact with a first tab provided on the first electrode plate; an inner gasket installed between the positive current collector plate and the case and blocking the electrical connection between the positive current collector plate and the case; a positive terminal electrically connected to the positive current collector plate and extending to the outside of the case; and an insulating part coupled to the outer edge of the positive current collector plate and blocking the electrical connection between the case and the positive current collector plate, wherein the thickness of the insulating part may be greater than the thickness of the positive current collector plate.

[0023] In some examples, an inner gasket may be located on the upper side of the insulating part.

[0024] In some examples, the insulating part may further include a safety projection protruding upward from the insulating part.

[0025] In some examples, the insulating member may include a second insulating support member that supports the lower side of the positive collector plate, a second insulating connecting member that extends upward from the second insulating support member and faces the end of the positive collector plate, and a second insulating cover member that extends horizontally from the second insulating connecting member and is located on the upper side of the positive collector plate.

[0026] In some examples, the second insulating support member may be provided with a plurality of holes penetrating the second insulating support member in the vertical direction.

[0027] In some examples, the second insulating cover member may be provided with a plurality of holes penetrating the second insulating cover member in the vertical direction.

[0028] In some examples, the insulating member may further include a safety projection that protrudes above the second insulating cover member and extends along the circumferential direction.

[0029] According to the present invention, by installing an insulating part, contact between the positive current collector plate and the negative case is prevented during compression or collision of the circular battery, thereby preventing the occurrence of a short circuit.

[0030] In addition, according to the present invention, since insulation is provided between the positive current collector plate and the case, the possibility of short circuits and thermal runaway can be suppressed.

[0031] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below.

[0032] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0033] FIG. 1 is a perspective view illustrating a secondary battery according to one embodiment of the present invention.

[0034] FIG. 2 is a cross-sectional view illustrating a secondary battery according to one embodiment of the present invention.

[0035] FIG. 3 is a cross-sectional view illustrating the upper portion of a secondary battery according to one embodiment of the present invention.

[0036] FIG. 4 is a cross-sectional view illustrating the state in which an insulating part and a positive current collector plate are installed inside a case according to one embodiment of the present invention.

[0037] FIG. 5 is an enlarged cross-sectional view showing the state in which an insulating part according to one embodiment of the present invention is installed on the side of an anode current collector plate.

[0038] FIG. 6 is a plan view of an anode current collector according to one embodiment of the present invention.

[0039] FIG. 7 is a cross-sectional view illustrating the state in which an insulating part and a positive current collector plate are installed inside a case according to another embodiment of the present invention.

[0040] FIG. 8 is an enlarged cross-sectional view showing an insulating member installed on the side of a positive current collector plate according to another embodiment of the present invention.

[0041] FIG. 9 is a cross-sectional view illustrating the state in which an insulating part and an anode current collector plate are installed inside a case according to another embodiment of the present invention.

[0042] FIG. 10 is an enlarged cross-sectional view showing an insulating member installed on the side of an anode current collector according to another embodiment of the present invention.

[0043] FIG. 11 is a cross-sectional view illustrating an insulating part with a safety protrusion installed and a positive current collector plate installed inside a case according to another embodiment of the present invention.

[0044] FIG. 12 is an enlarged cross-sectional view showing an insulating part connected to a safety protrusion according to another embodiment of the present invention installed on the side of an anode current collector plate.

[0045] FIG. 13 is a cross-sectional view illustrating a secondary battery according to another embodiment of the present invention.

[0046] FIG. 14 is a cross-sectional view illustrating the state in which an insulating part and a positive current collector plate are installed inside a case according to another embodiment of the present invention.

[0047] FIG. 15 is an enlarged cross-sectional view showing an insulating member installed on the side of a positive current collector plate according to another embodiment of the present invention.

[0048] FIGS. 16a and FIGS. 16b are perspective views illustrating a battery pack including an exemplary secondary battery according to the present invention.

[0049] FIGS. 17a and FIGS. 17b are a perspective view and a side view illustrating an automobile including an exemplary battery pack according to the present invention.

[0050] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0051] Additionally, as used herein, “comprise, include” and / or “comprising, including” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and / or groups.

[0052] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0053] The statement that two subjects of comparison are 'identical' means that they are 'substantially identical.' Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0054] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

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

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

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

[0058] Throughout the specification, “A and / or B” means A, B, or A and B unless specifically stated otherwise. That is, “and / or” includes any combination or any combination of the enumerated items. “C to D” means C or more and D or less, unless specifically stated otherwise.

[0059] The terms used in this specification are intended to describe embodiments of the present disclosure and are not intended to limit the present disclosure.

[0060] FIG. 1 is a perspective view illustrating a secondary battery (100) according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a secondary battery (100) according to an embodiment of the present invention. As illustrated in FIG. 1 and FIG. 2, a secondary battery (100) according to an embodiment of the present invention may include a case (110), an electrode assembly (120), a positive terminal (140), a positive current collector plate (150), and an insulating part (170). Additionally, the secondary battery (100) may further include at least one of a negative current collector plate (130), an insulating gasket (800), an upper insulating member (801), a cap gasket (802), an inner gasket (803), and a vent plate (860). In the present invention, the secondary battery (100) may be referred to as a cylindrical secondary battery (100) or a battery.

[0061] The case (110) can be modified in various ways within the technical concept of accommodating the electrode assembly (120). A case (110) according to one embodiment of the present invention accommodates the electrode assembly (120) and the electrolyte, and can form the external shape of a secondary battery (100) together with a vent plate (860). The case (110) may include or be referred to as a can, housing, or exterior material. The case (110) may include a case upper wall (111) in the shape of a roughly circular plate and a case side wall (112) in the shape of a cylinder extending downward from the case upper wall (111). In some examples, the case (110) may be configured in various shapes other than circular, such as a pouch shape. Additionally, the case (110) may include a metal such as steel, nickel-plated steel, steel alloy, aluminum, aluminum alloy, or a special purpose cold rolled steel sheet for deep drawing (SPCE), or a laminate film or plastic that constitutes a pouch. A beading portion (113) recessed toward the interior of the case (110) may be provided on the case side wall (112). The lower end of the case side wall (112) may be provided with a crimping portion (114) having a curved shape toward the interior of the case (110). When both the beading portion (113) and the crimping portion (114) are included in the case (110), the crimping portion (114) is located below the beading portion (113). The beading portion (113) can support the lower part of the electrode assembly (120). Thus, the beading portion (113) and the case upper wall (111) can restrict the vertical movement of the electrode assembly (120). The crimping portion (114) can firmly fix the vent plate (860) by pressing the edge of the vent plate (860) through the cap gasket (802).

[0062] The surface inside the case (110) is referred to as the inner surface of the case (115). At least one of the inner surface of the upper wall (111) of the case and the inner surface of the side wall (112) of the case may be referred to as the inner surface of the case (115).

[0063] The electrode assembly (120) may include a first electrode plate (121), a second electrode plate (122), and a separator (123). The electrode assembly (120) may be housed with an electrolyte inside the case (110). The electrode assembly (120) may include or be referred to as an electrode group, an electrode body, or a jelly roll. The electrode assembly (120) may be wound in a cylindrical shape. In some examples, a hollow core (124) may be provided in the center of the electrode assembly (120) in the vertical direction (vertical direction with respect to FIG. 2). In some examples, a center pin (optional) may be attached to the core (124).

[0064] The first electrode plate (121) may include a first substrate (1211) and a first active material layer (1212) located on the first substrate (1211). A first tab (1213) on the first substrate (1211) where the first active material layer (1212) is not located may be extended outward (e.g., upward). The first tab (1213) may be electrically connected to an anode current collector plate (150). In the present invention, the first tab (1213) may be referred to as a first non-removable portion or an anode substrate tab.

[0065] The second electrode plate (122) may include a second substrate (1221) and a second active material layer (1222) located on the second substrate (1221). A second blank portion or a second tab (1223) where the second active material layer (1222) is not located in the second substrate (1221) may be extended outward (e.g., downward), and the second tab (1223) may be electrically connected to a negative electrode current collector plate (130), and such a negative electrode current collector plate (130) may be electrically connected to a case (110). In some examples, the first tab (1213) and the second tab (1223) may be extended in opposite directions. In the present invention, the second tab (1223) may be referred to as a second blank portion or a negative electrode substrate tab.

[0066] The first electrode plate (121) can function as an anode. In this case, the first substrate (1211) may be composed of, for example, aluminum foil, and the first active material layer (1212) may include, for example, a transition metal oxide. The second electrode plate (122) can function as a cathode. In this case, the second substrate (1221) may be composed of, for example, copper foil or nickel foil, and the second active material layer (1222) may include, for example, graphite and / or silicon.

[0067] The separator (123) can prevent a short circuit between the first electrode plate (121) and the second electrode plate (122) while allowing the movement of lithium ions. In some examples, the separator (123) may be located on opposite sides of the first electrode plate (121) or on opposite sides of the second electrode plate (122).

[0068] The negative current collector (130) may be connected to the second tab (1223) of the electrode assembly (120). The negative current collector (130) may include or be referred to as a second current collector, a second conductor, or a second conductor plate. In some examples, the negative current collector (130) may be provided in the form of a roughly circular disc. A plurality of second tabs (1223) extending / protruding from the electrode assembly (120) may be electrically connected to the upper surface of the negative current collector (130). In some examples, the second tabs (1223) may be bent inward toward the core (124) or outward toward the core (124), and may extend in a straight direction extending upward and downward. The second tabs (1223) may be laser welded to the upper surface of the negative current collector (130). The negative electrode collector plate (130) may comprise copper, a copper alloy, nickel, a nickel alloy, aluminum, or an aluminum alloy. In some examples, the negative electrode collector plate (130) may further comprise a negative electrode collector plate bend (1301) that is electrically connected to the case (110) by being sandwiched between the beading portion (113) and the cap gasket (802).

[0069] A cap gasket (802) is installed between the beading portion (113) and the crimping portion (114) of the case (110). The case (110) is located on the outside of the cap gasket (802), and a vent plate (860) is located on the inside of the cap gasket (802). The cap gasket (802) is installed in a shape that wraps around the outer perimeter of the vent plate (860). The vent plate (860) may include or be referred to as a cap plate, a cap assembly, a safety vent, a conductive plate, or a sealing plate. In some examples, the beading portion (113) and the crimping portion (114) are not configured, and the vent plate (860) may be directly welded to the case side wall (112), or the vent plate (860) may be joined to the case side wall (112) by a curling or seaming method.

[0070] In some examples, the vent plate (860) may further include a vent notch (861) provided with a relatively thin thickness. In some examples, the vent plate (860) may include a peripheral area (862) located between the beading portion (113) and the crimping portion (114) and fitted into the inner side of the cap gasket (802). Additionally, the vent plate (860) may include an inner area (863) connected to the peripheral area (862) and lower than the peripheral area (862), and a central area (864) connected to the inner area (863) and higher than the inner area (863). The vent notch (861) may be provided on the inner area (863). In some examples, the central area (864) may be closer to the electrode assembly (120) than the peripheral area (862) and the inner area (863). These vent notches (861) are designed to rupture and release internal gas when the internal pressure of the secondary battery (100) is higher than the reference pressure. The vent plate (860) may be made of iron, nickel-plated iron, stainless steel, aluminum, or an aluminum alloy. In some examples, the case (110) and the vent plate (860) coupled thereto are collectively referred to as the case (110).

[0071] The positive current collector (150) may be in contact with or connected to a first tab (1213) provided on the first electrode plate (121) of the electrode assembly (120). The positive current collector (150) may include or be referred to as a first current collector, a first conductor, or a first conductive plate. In some examples, the positive current collector (150) may be provided in the form of a roughly circular disc. A plurality of first tabs (1213) extending / protruding from the electrode assembly (120) may be electrically connected to the lower surface of the positive current collector (150). In some examples, the first tabs (1213) may be compacted or bent in an inward direction toward the core (124) or an outward direction toward the core (124) and laser welded to the lower surface of the positive current collector (150). The positive current collector (150) may include aluminum, an aluminum alloy, copper, a copper alloy, nickel, or a nickel alloy.

[0072] The positive terminal (140) is electrically connected to the positive current collector plate (150), and various modifications are possible within the technical concept of extending to the outside of the case (110).

[0073] The positive terminal (140) may be coupled to the case (110) and electrically connected to the electrode assembly (120). The positive terminal (140) may include a rivet post (141), a rivet head (142), and a rivet leg (143). The rivet post (141) may be coupled to the case upper wall (111) while penetrating the case upper wall (111). The rivet head (142) may be connected to the top of the rivet post (141) and positioned on the upper side of the case upper wall (111). The rivet leg (143) may be connected to the bottom of the rivet post (141) and positioned on the lower side of the case upper wall (111). In some examples, an insulating gasket (800) may be interposed between the rivet post (141) and the case upper wall (111). In some examples, an upper insulating member (801) may be interposed between the rivet head (142) and the upper side of the case wall (111). In some examples, an inner gasket (803) may be installed between the rivet leg (143) and the lower side of the case wall (111). The inner gasket (803) is installed between the positive terminal (140) and the case (110), and various modifications are possible within the technical concept of blocking the electrical connection between the positive terminal (140) and the case (110).

[0074] In some examples, the insulating gasket (800), the upper insulating member (801), and the inner gasket (803) may each be provided separately. In some examples, the insulating gasket (800), the upper insulating member (801), and the inner gasket (803) may not be integral. The insulating gasket (800) and the upper insulating member (801) may be integral, and the inner gasket (803) may be a separate member. In some examples, the insulating gasket (800), the upper insulating member (801), and the inner gasket (803) may be integral. In some examples, the insulating gasket (800) and the inner gasket (803) may be integral, and the upper insulating member (801) may be a separate member. In some examples, the rivet post (141) may include a rivet groove (1411). In some examples, the rivet leg (143) may be electrically connected to the positive collector plate (150). In some examples, the rivet leg (143) and the positive collector plate (150) may be formed as a single unit. In some examples, the rivet leg (143) may be welded to the positive collector plate (150) by irradiating a laser beam through the rivet groove (1411). In some examples, after the welding process, the rivet groove (1411) may be filled with metal or sealed with a metal plate. The positive terminal (140) may comprise aluminum, an aluminum alloy, copper, a copper alloy, nickel, or a nickel alloy. In this way, the positive terminal (140) may perform the function of being electrically connected to an external device. In some examples, the case top wall (111) may also perform the function of being electrically connected to an external device.

[0075] By installing an insulating gasket (800) and an upper insulating member (801), the gap between the case (110) and the integrated terminal part is sealed, thereby preventing leakage of the electrolyte.

[0076] An inner gasket (803) may be interposed between the case (110) and the positive terminal (140). The inner gasket (803) may be in contact with or bonded to the upper wall (111) of the case. In some examples, a portion of the inner gasket (803) may be in contact with or bonded to a rivet post (141).

[0077] FIG. 3 is a cross-sectional view showing the upper part of a secondary battery (100) according to one embodiment of the present invention, FIG. 4 is a cross-sectional view showing the state in which an insulating part (170) and a positive current collector plate (150) according to one embodiment of the present invention are installed inside a case (110), and FIG. 5 is an enlarged cross-sectional view showing the state in which an insulating part (170) according to one embodiment of the present invention is installed on the side of a positive current collector plate (150).

[0078] As illustrated in FIGS. 3 to 5, the insulating part (170) is coupled to the outer edge of the positive current collector plate (150), and various modifications are possible within the technical concept of blocking the electrical connection between the case (110) and the positive current collector plate (150).

[0079] The insulating part (170) is installed between the positive current collector plate (150), which is located inside the case (110), and the inner surface of the case (110), and blocks the electrical connection between the positive current collector plate (150) and the case (110). The insulating part (170) according to one embodiment of the present invention may include or be referred to as an insulator, an insulating coating, an insulating plate, an insulating tape, or an insulating film. The positive current collector plate (150) is formed in the shape of a disc, and the insulating part (170) is installed in a shape that wraps around the outer perimeter of the positive current collector plate (150). The insulating part (170) may be formed in the shape of a ring and may be coupled to the edge of the positive current collector plate (150) by a fitting method. The insulating part (170) is coupled to the outer edge of the positive current collector plate (150), and the insulating part (170) and the positive current collector plate (150) can be separated as needed.

[0080] By installing an insulating part (170), a contact short circuit between the case (110) and the positive current collector plate (150) can be prevented. The positive current collector plate (150) is circular in shape, and the insulating part (170), installed along the circumference of the positive current collector plate (150), can be extended along the circumferential direction. The cross-section of the insulating part (170) can have a "C" shape.

[0081] The insulating part (170) may include polypropylene, polyethylene, silicon-based polymer, or EPDM (ethylene propylene diene terpolymer) that does not react with the electrolyte. Additionally, the insulating part (170) may include at least one of polyimide, Teflon, and polyester.

[0082] Polyimide exhibits excellent heat resistance and superior electrical insulation performance. Due to its chemical stability, it provides excellent insulation even in the chemical environment within a battery. Teflon possesses high heat resistance, is chemically stable, and offers excellent electrical insulation. Polyethylene is flexible, offers good electrical insulation, and is durable. Polyester is highly durable, electrically stable, and chemically stable. Polypropylene is an economical and durable material. EPDM is a thermally and chemically stable rubber primarily used as an insulation and sealing material.

[0083] The insulating part (170) can be fixed to the side of the positive current collector plate (150) through methods such as adhesive, fastening member, heat fusion, mechanical bonding, chemical bonding, etc.

[0084] The insulating member (170) may include a first insulating support member (173) that supports the lower side of the coupling member (160), a first insulating connecting member (175) that extends upward from the first insulating support member (173) and faces the end of the coupling member (160), and a first insulating cover member (176) that extends horizontally from the first insulating connecting member (175) and is located on the upper side of the coupling member (160).

[0085] At least one of the upper and lower sides of the insulating part (170) can form a plane identical to the outer side of the positive current collector plate (150).

[0086] In some examples, the upper surface (171) of the insulating part is the upper surface of the first insulating cover member (176), so the same reference numeral 171 may be used for the upper surface (171) of the insulating part and the upper surface of the first insulating cover member (176). Also, since the upper surface (151) of the positive collector plate is the upper surface of the collector plate body (153), the same reference numeral 151 may be used for the upper surface (151) of the positive collector plate and the upper surface of the collector plate body (153). The upper surface (171) of the first insulating cover member (176) and the upper surface (151) of the collector plate body may be located on the same plane in the horizontal direction.

[0087] In some examples, the lower side surface (172) of the insulating part is the lower side surface of the first insulating support member (173), so the same reference numeral 172 may be used for the lower side surface (172) of the insulating part and the lower side surface (173) of the first insulating support member (173). Also, since the lower side surface (152) of the positive collector plate is the lower side surface (153) of the collector plate body (153), the same reference numeral 152 may be used for the lower side surface (152) of the positive collector plate and the lower side surface (153) of the collector plate body. The lower side surface (172) of the first insulating support member (173) and the lower side surface (152) of the collector plate body may be located on the same plane in the horizontal direction.

[0088] The horizontal lengths of the first insulating support member (173) and the first insulating cover member (176) connected to the first insulating connecting member (175) may be the same. Thus, the coupling member (160) of the positive current collector plate (150), which is installed in a state wrapped by the insulating part (170), is prevented from being exposed to the outside, thereby preventing a short circuit between the case (110) and the positive current collector plate (150).

[0089] FIG. 6 is a plan view of an anode current collector plate (150) according to an embodiment of the present invention. As shown in FIG. 4 and FIG. 6, the anode current collector plate (150) may be formed in a circular shape. The anode current collector plate (150) may include a current collector plate body (153) and a coupling member (160). Additionally, the anode current collector plate (150) may include an upper surface (151) of the anode current collector plate that contacts the anode terminal (140) and a lower surface (152) of the anode current collector plate that contacts the anode of the electrode assembly (120).

[0090] The current collector body (153) can be modified in various ways within the technical concept of being electrically connected to the first tap (1213) and the positive terminal (140). The current collector body (153) according to one embodiment of the present invention may include a terminal connection part (154) installed in contact with the positive terminal (140), a electrode plate connection part (155) spaced apart from the terminal connection part (154), located on the outside of the terminal connection part (154), and connected to the first tap (1213), and a fuse part (156) connecting the electrode plate connection part (155) and the terminal connection part (154).

[0091] The positive current collector plate (150) may be a circular metal plate having a shape corresponding to the upper surface of the electrode assembly (120). The positive current collector plate (150) may be made of aluminum (Al). The lower surface (152) of the positive current collector plate may be fixed and electrically connected to the first tab (1213) exposed to the upper surface of the electrode assembly (120) by welding while in contact with the upper surface of the electrode assembly (120). The positive current collector plate (150) may be fixed and electrically connected to the positive terminal (140) by welding while in contact with the lower surface of the positive terminal (140). The positive current collector plate (150) is located between the first electrode plate (121) of the electrode assembly (120) and the positive terminal (140) and serves as a passage for current flow.

[0092] The collector plate body (153) may include a terminal connection part (154), an electrode plate connection part (155), and a fuse part (156). The terminal connection part (154) is located at the center of the positive collector plate (150) and may be formed in a roughly circular shape. A rivet leg (143) of the positive terminal (140) may be welded to the upper surface of the terminal connection part (154). The area (or size) of the terminal connection part (154) may be larger than the area (or size) of the rivet leg (143). Alternatively, the diameter of the terminal connection part (154) may be larger than the diameter of the rivet leg (143). The ratio of the radius of the terminal connection part (154) to the radius of the positive collector plate (150) may be 1 / 7 to 1 / 5. For example, if the ratio of the radius of the terminal connection part (154) to the radius of the positive electrode collector plate (150) is less than 1 / 7, it may be difficult to weld the rivet leg (143) of the positive electrode terminal (140), and if the ratio of the radius of the terminal connection part (154) to the radius of the positive electrode collector plate (150) is greater than 1 / 5, the area of ​​the electrode plate connection part (155) is reduced, making it difficult to weld the first tab (1213) of the first electrode plate (121). In some examples, the thickness of the terminal connection part (154) may be formed to be thicker than the thickness of the electrode plate connection part (155). Thus, when the positive electrode terminal (140) is welded to the terminal connection part (154), the deformation of the terminal connection part (154) can be prevented.

[0093] The electrode plate connection portion (155) is located on the outside of the terminal connection portion (154), and the first electrode plate (121) of the electrode assembly (120) can be electrically connected. For example, the first tab (1213) of the first electrode plate (121) protruding to the upper side of the electrode assembly (120) can be welded to the lower surface of the electrode plate connection portion (155). The terminal connection portion (154) is in the shape of a circular plate, and the electrode plate connection portion (155) may also be in the shape of a circular plate having a hole in the center.

[0094] The fuse section (156) connects the terminal connection section (154) and the electrode plate connection section (155). The fuse section (156) can improve the safety of the secondary battery (100) by melting and cutting due to the heat generated when a short circuit or overcurrent occurs in the secondary battery (100), thereby interrupting the current. The width of the fuse section (156) may be about 3 mm to about 5 mm, and preferably 4 mm.

[0095] The connecting member (160) can be modified in various ways within the technical concept of protruding from the end of the collector plate body (153) and extending into the inner side of the insulating part (170). The connecting member (160) is located on the outer side of the rim of the collector plate body (153) and can be formed integrally with the collector plate body (153). The connecting member (160) is formed in a ring shape. For example, the thickness of the collector plate body (153) may be greater than the thickness of the connecting member (160). The sum of the thickness of the first insulating support member (173), the thickness of the first insulating cover member (176), and the thickness of the connecting member (160) may be equal to the sum of the thicknesses of the collector plate body (153). Accordingly, when the insulating part (170) is coupled to the coupling member (160), the upper surface (171) of the insulating part and the upper surface (151) of the positive electrode collector plate form the same plane, and the lower surface (172) of the insulating part and the lower surface of the negative electrode collector plate (130) form the same plane.

[0096] By forming the same plane between the insulating part (170) and the upper and lower surfaces of the positive current collector plate (150), interference between parts can be minimized during the assembly of the secondary battery (100), and the overall structural stability of the battery is improved. This simplifies the battery assembly process, increases the durability of the battery, and contributes to securing electrical insulation. In addition, by forming the same plane, the resistance to external shocks of the battery increases, and thermal stability is improved, thereby enhancing the safety of the secondary battery (100).

[0097] FIG. 7 is a cross-sectional view illustrating the state in which an insulating part (170) and an anode current collector plate (150) are installed inside a case (110) according to another embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view illustrating the state in which an insulating part (170) is installed on the side of an anode current collector plate (150) according to another embodiment of the present invention. As shown in FIG. 7 and FIG. 8, the coupling member (160) may include a coupling body (161) that extends circumferentially along the circumference of the current collector plate body (153), and a coupling projection (162) that protrudes upward and downward from the coupling body (161) and engages with the inside of the insulating part (170).

[0098] The coupling body (161) is extended in a ring shape, and the thickness of the coupling body (161) is smaller than the thickness of the collector plate body (153). A plurality of coupling protrusions (162) may protrude from the upper and lower sides of the coupling body (161). The cross-section of the coupling protrusion (162) may be formed in at least one shape among a sphere, an ellipse, and a polygon including a triangle. Various modifications are possible, such as the coupling protrusion (162) being located only on the upper side of the coupling body (161) or the coupling protrusion (162) being located only on the lower side of the coupling body (161).

[0099] The insulating part (170) may further include a coupling groove part (178) formed on the inner surface of the first insulating support member (173) and the first insulating cover member (176) to form a coupling groove part (178) that is coupled with a coupling projection (162) protruding from the coupling member (160). A coupling groove part (178) may be formed on the upper surface of the first insulating support member (173) at a position facing the coupling projection (162). Since the coupling projection (162) protruding downward from the coupling body (161) is inserted into the coupling groove part (178) and fixed, the coupling force between the insulating part (170) and the coupling member (160) is increased.

[0100] A coupling groove (178) may be formed on the lower side of the first insulating cover member (176) at a position facing the coupling projection (162). Since the coupling projection (162) protruding upward from the coupling body (161) is inserted into the coupling groove (178) and fixed, the coupling force between the insulating part (170) and the coupling member (160) is increased.

[0101] When the positive current collector plate (150) and the insulating part (170) are combined, the thickness of the positive current collector plate (150) is formed thinly, so the bonding strength between the positive current collector plate (150) and the insulating part (170) may be reduced. Therefore, by forming a protrusion at the bonding portion of the positive current collector plate (150) and the insulating part (170) to increase frictional force, the bonding strength between the positive current collector plate (150) and the insulating part (170) can be improved.

[0102] FIG. 9 is a cross-sectional view illustrating the state in which an insulating member (170) and an anode current collector plate (150) according to another embodiment of the present invention are installed inside a case (110), and FIG. 10 is an enlarged cross-sectional view illustrating the state in which an insulating member (170) according to another embodiment of the present invention is installed on the side of an anode current collector plate (150). As shown in FIG. 9 and FIG. 10, a plurality of holes may be formed in the insulating member (170) coupled to the coupling member (160). For example, the first insulating support member (173) may be provided with a lower connecting hole (174), which is a plurality of holes penetrating the first insulating support member (173) in the vertical direction. In some examples, the first insulating cover member (176) may be provided with an upper connecting hole (177), which is a plurality of holes penetrating the first insulating cover member (176) in the vertical direction.

[0103] Since the insulating part (170) is provided with an upper connection hole (177) and a lower connection hole (174), heat generated from the positive current collector plate (150) can be easily dissipated through the upper connection hole (177) and the lower connection hole (174). The upper connection hole (177) and the lower connection hole (174) can prevent heat accumulation in the positive current collector plate (150), thereby improving electrical safety.

[0104] FIG. 11 is a cross-sectional view illustrating an insulating part (170) with a safety protrusion (190) installed according to another embodiment of the present invention and an anode current collector plate (150) installed inside a case (110), and FIG. 12 is an enlarged cross-sectional view illustrating an insulating part (170) connected to a safety protrusion (190) according to another embodiment of the present invention installed on the side of an anode current collector plate (150). As shown in FIG. 11 and FIG. 12, the insulating part (170) may further include a safety protrusion (190) protruding upward from the first insulating cover member (176).

[0105] By installing a protrusion made of an insulating material such as rubber on the edge of the insulating part (170), contact between the positive current collector plate (150) supported by the insulating part (170) and the case (110) is prevented, thereby improving electrical safety. Various modifications are possible, such as forming a ring-shaped protrusion on the upper side of the insulating part (170) or installing a plurality of protrusions spaced apart at set intervals.

[0106] FIG. 13 is a cross-sectional view illustrating a secondary battery (100) according to another embodiment of the present invention, FIG. 14 is a cross-sectional view illustrating an insulating part (700) and a positive current collector plate (150) installed inside a case (110) according to another embodiment of the present invention, and FIG. 15 is an enlarged cross-sectional view illustrating an insulating part (700) installed on the side of a positive current collector plate (150) according to another embodiment of the present invention. As illustrated in FIGS. 13 to 15, an exemplary secondary battery (100) according to one embodiment of the present invention comprises: an electrode assembly (120) comprising a first electrode plate (121), a second electrode plate (122), and a separator (123); a case (110) housing the electrode assembly (120); a positive current collector plate (150) in contact with a first tab (1213) provided on the first electrode plate (121); an inner gasket (803) installed between the positive current collector plate (150) and the case (110) and blocking the electrical connection between the positive current collector plate (150) and the case (110); a positive terminal (140) electrically connected to the positive current collector plate (150) and extending to the outside of the case (110); and a positive terminal (140) coupled to the outer edge of the positive current collector plate (150) and the case (110) and the positive It includes an insulating part (700) that blocks electrical connections between current collector plates (150), and the thickness of the insulating part (700) may be greater than the thickness of the positive current collector plate (150). The cross-section of the insulating part (700) is formed in a "U" shape, and the positive current collector plate (150) is formed with a uniform thickness throughout. The positive current collector plate (150) is in the shape of a disc, and the insulating part (700) is attached to the edge of the positive current collector plate (150).

[0107] An inner gasket (803) may be positioned on the upper side of the insulating part (700). The upper side surface (701) of the insulating part is positioned higher than the upper side surface (151) of the positive collector plate. Additionally, the lower side surface (702) of the insulating part is positioned lower than the lower side surface (152) of the positive collector plate. Furthermore, one end (or first end) of the inner gasket (803) is positioned on the upper side of the insulating part (700) coupled to one end of the positive collector plate (150). The other end (or second end) of the inner gasket (803) is positioned on the upper side of the insulating part (700) coupled to the other end of the positive collector plate (150). Since both ends of the inner gasket (803) are installed in a position that overlaps with the insulating part (700) in the vertical direction, a short circuit caused by the positive collector plate (150) contacting the case (110) can be prevented.

[0108] The insulating portion (700) may include a second insulating support member (703) that supports the lower side of the positive current collector plate (150), a second insulating connecting member (705) that extends upward from the second insulating support member (703) and faces the end of the positive current collector plate (150), and a second insulating cover member (706) that extends horizontally from the second insulating connecting member (705) and is located on the upper side of the positive current collector plate (150). The second insulating cover member (706) is located on the upper side of the positive current collector plate (150), and the second insulating support member (703) is located on the lower side of the positive current collector plate (150).

[0109] In some examples, the second insulating support member (703) may be provided with a plurality of holes penetrating the second insulating support member (703) in the vertical direction. In some examples, the second insulating cover member (706) may be provided with a plurality of holes penetrating the second insulating cover member (706) in the vertical direction.

[0110] In some examples, the insulating portion (700) may further include a safety projection (190) that protrudes upward from the second insulating cover member (706) and extends along the circumferential direction. The safety projection (190) protruding upward from the insulating portion (700) is formed of an insulating material. By installing the safety projection (190), a safe distance between the insulating portion (700) and the case (110) can be secured, thereby preventing the occurrence of a fire in the secondary battery (100).

[0111] The electrode assembly of the present invention will be described in more detail.

[0112] In some examples, a compound capable of reversible intercalation and deintercalation of lithium (a lithated intercalation compound) may be used as the positive electrode active material. Specifically, one or more composite oxides of lithium and a metal selected from cobalt, manganese, nickel, and combinations thereof may be used.

[0113] The above composite oxide may be a lithium transition metal composite oxide, and specific examples include a lithium nickel-based oxide, a lithium cobalt-based oxide, a lithium manganese-based oxide, a lithium iron phosphate-based compound, a cobalt-free nickel-manganese-based oxide, or a combination thereof.

[0114] As an example, a compound represented by any one of the following chemical formulas may be used.

[0115] Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O 4-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c O 2-α D α(0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b-c Mn b X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2(0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4(0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3(0≤f≤2); Li a FePO4(0.90≤a≤1.8).

[0116] In the above 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; L 1 is Mn, Al, or a combination thereof.

[0117] 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 may include a positive electrode active material and may further include a binder and / or a conductive material.

[0118] The content of the above positive active material is 90% to 99.5% by weight with respect to 100% by weight of the positive active material layer, and the content of the above binder and conductive material may each be 0.5% to 5% by weight with respect to 100% by weight of the positive active material layer.

[0119] Aluminum may be used as the current collector mentioned above, but is not limited thereto.

[0120] 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.

[0121] A material capable of reversibly intercalating / deintercalating the above lithium ions may be a carbon-based negative electrode active material, such as 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, etc.

[0122] As a material capable of doping and undoping the above lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material may be used. The above Si-based negative electrode active material may be silicon, a silicon-carbon composite, SiOx (0 < x < 2), a Si-based alloy, or a combination thereof.

[0123] The 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.

[0124] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles and an amorphous carbon coating layer located on the surface of the core.

[0125] 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 may include a negative electrode active material and may further include a binder and / or a conductive material.

[0126] For example, the negative electrode active material layer may comprise 90% to 99% by weight of negative electrode active material, 0.5% to 5% by weight of binder, and 0% to 5% by weight of conductive material.

[0127] As the binder, a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof may be used. When an aqueous binder is used as the cathode binder, a cellulose-based compound capable of imparting viscosity may be further included.

[0128] As the above current collector, a material selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and combinations thereof may be used.

[0129] The electrolyte for a lithium secondary battery may include a non-aqueous organic solvent and a lithium salt.

[0130] The above-mentioned non-aqueous organic solvent serves as a medium through which ions involved in the electrochemical reaction of the battery can move.

[0131] The above-mentioned non-aqueous organic solvent may be a carbonate-based, ester-based, ether-based, ketone-based, or alcohol-based solvent, a non-protic solvent, or a combination thereof, and may be used alone or in a mixture of two or more types.

[0132] In addition, when using carbonate-based solvents, cyclic carbonates and chain carbonates can be mixed and used.

[0133] As described above, a separator may be present between the positive and negative electrodes of a lithium secondary battery. As such a separator, polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer film of two or more layers thereof may be used.

[0134] The above 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.

[0135] The above organic material may include a polyvinylidene fluoride-based polymer or a (meth)acrylic-based polymer.

[0136] The above inorganic materials are Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, It may include, but is not limited to, inorganic particles selected from SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof.

[0137] The above organic and inorganic materials may exist mixed in a single coating layer, or may exist in a stacked form with a coating layer containing organic materials and a coating layer containing inorganic materials.

[0138] The battery according to the above-described embodiment can be used to manufacture a battery pack.

[0139] FIGS. 16a and 16b are perspective views illustrating a battery pack including an exemplary secondary battery according to the present invention. Referring to FIGS. 16a and 16b, 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 (200) 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 mixed series / parallel manner to obtain the required electrical output. In the drawings, for convenience of illustration, components such as a bus bar for electrical connection of battery cells, a cooling unit, and external terminals are omitted. In some examples, the battery pack (300) may be mounted in 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-wheeled vehicle or a two-wheeled vehicle.

[0140] FIGS. 17a and FIGS. 17b are a perspective view and a side view illustrating an automobile including an exemplary battery pack according to the present invention. In FIG. 17a, the battery pack (300) may include a battery pack cover (311) (which may correspond to the first housing) which is part of the vehicle under body (410) and a pack frame (312) (which may correspond to the second housing) disposed at the bottom of the vehicle under body (410). The battery pack cover (311) and the pack frame (312) may be structures formed integrally with the vehicle floor portion (420). The vehicle under body (410) separates the interior and exterior of the vehicle, and the pack frame (312) may be disposed on the exterior of the vehicle.

[0141] As illustrated in FIG. 17b, the vehicle (500) may be formed by combining additional parts, such as a hood (510) at the front of the vehicle and fenders (520) located at the front and rear of the vehicle, respectively, with the vehicle body (400). The vehicle (500) includes a battery pack (300) comprising a battery pack cover (311) and a pack frame (312), and the battery pack (300) may be combined with the vehicle body part (400).

[0142] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. An electrode assembly comprising a first electrode plate, a second electrode plate, and a separator; A case for housing the above electrode assembly; A positive current collector plate in contact with a first tab provided on the first electrode plate; A positive terminal electrically connected to the positive current collector plate and extending to the outside of the case; and It includes an insulating part that is coupled to the outer edge of the anode current collector plate and blocks the electrical connection between the case and the anode current collector plate; A secondary battery characterized in that at least one of the upper and lower surfaces of the insulating portion forms a plane identical to the outer surface of the positive current collector plate.

2. In Paragraph 1, The upper surface of the insulating part forms a plane identical to the upper surface of the positive current collector plate, and A secondary battery characterized in that the lower surface of the insulating portion forms the same plane as the lower surface of the positive current collector plate.

3. In Paragraph 1, The above positive current collector plate comprises: a current collector plate body electrically connected to the first tab and the positive terminal; and A secondary battery comprising: a coupling member protruding from the end of the current collector body and extending into the inner side of the insulating part.

4. In Paragraph 3, A secondary battery characterized in that the thickness of the above-mentioned current collector body is greater than the thickness of the above-mentioned coupling member.

5. In Paragraph 3, The above-mentioned collector plate body comprises a terminal connection portion installed in contact with the above-mentioned positive terminal; A electrode plate connection portion spaced apart from the terminal connection portion, located on the outside of the terminal connection portion, and connected to the first tab; and A secondary battery comprising: a fuse portion connecting the electrode plate connection portion and the terminal connection portion.

6. In Paragraph 3, The above coupling member comprises: a coupling body extending circumferentially along the circumference of the current collector body; and A secondary battery comprising: a coupling projection protruding upward and downward from the coupling body and engaging with the inner side of the insulating part.

7. In Paragraph 3, The above insulating member comprises a first insulating support member that supports the lower side of the coupling member; A first insulating connecting member extending upward from the first insulating support member and facing the end of the coupling member; and A secondary battery comprising: a first insulating cover member extending horizontally from the first insulating connecting member and located on the upper side of the coupling member.

8. In Paragraph 7, A secondary battery characterized in that the upper surface of the first insulating cover member and the upper surface of the current collector body are located on the same plane.

9. In Paragraph 7, A secondary battery characterized in that the lower surface of the first insulating support member and the lower surface of the current collector body are located on the same plane.

10. In Paragraph 7, A secondary battery characterized in that the first insulating support member is provided with a plurality of holes penetrating the first insulating support member in the vertical direction.

11. In Paragraph 7, A secondary battery characterized in that the first insulating cover member is provided with a plurality of holes penetrating the first insulating cover member in the vertical direction.

12. In Paragraph 7, The secondary battery is characterized by further including: a coupling groove portion in which a groove is formed on the inner surface of the first insulating support member and the first insulating cover member, and coupling is formed with a coupling projection protruding from the coupling member.

13. In Paragraph 7, The secondary battery is characterized in that the insulating member further includes a safety projection protruding upward from the first insulating cover member.

14. An electrode assembly comprising a first electrode plate, a second electrode plate, and a separator; A case for housing the above electrode assembly; A positive current collector plate in contact with a first tab provided on the first electrode plate; An inner gasket installed between the anode current collector plate and the case, which blocks the electrical connection between the anode current collector plate and the case; A positive terminal electrically connected to the positive current collector plate and extending to the outside of the case; and It includes an insulating part that is coupled to the outer edge of the anode current collector plate and blocks the electrical connection between the case and the anode current collector plate; A secondary battery characterized in that the thickness of the insulating part is greater than the thickness of the positive current collector plate.

15. In Paragraph 14, A secondary battery characterized by the inner gasket being located on the upper side of the insulating portion.

16. In Paragraph 14, A secondary battery characterized in that the insulating portion further includes a safety projection protruding upward from the insulating portion.

17. In Paragraph 14, The above insulating part comprises a second insulating support member that supports the lower side of the anode current collector plate; A second insulating connecting member extending upward from the second insulating support member and facing the end of the anode current collector plate; and A secondary battery comprising: a second insulating cover member extending horizontally from the second insulating connecting member and positioned above the positive current collector plate.

18. In Paragraph 17, A secondary battery characterized in that the second insulating support member is provided with a plurality of holes penetrating the second insulating support member in the vertical direction.

19. In Paragraph 17, A secondary battery characterized in that the second insulating cover member is provided with a plurality of holes penetrating the second insulating cover member in the vertical direction.

20. In Paragraph 17, A secondary battery characterized in that the insulating member further includes a safety projection that protrudes upward from the second insulating cover member and extends along the circumferential direction.

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