Secondary battery

Abstract

The present disclosure relates to a secondary battery, and a technical problem to be solved is to provide a secondary battery in which a positive electrode lead tab and a positive electrode current collector plate can be installed insulated from a case while preventing a decrease in capacity of the secondary battery. To this end, the present disclosure provides the secondary battery including: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case for accommodating the electrode assembly; an integrated terminal unit entirely or partially located inside the case, electrically connected to the first electrode plate, and extending to the outside of the case; and an insulating unit installed between the integrated terminal unit located inside the case and the inner surface of the case and blocking electrical connection between the integrated terminal unit and the case, wherein the insulating unit extends in the longitudinal direction of the case.

Description

secondary battery

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

[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] The present invention relates to a secondary battery in which a positive electrode substrate tab and a positive electrode collector plate can be installed in an insulated state from a case while preventing a decrease in the capacity of the secondary battery.

[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] An exemplary secondary battery according to one embodiment of the present invention for solving the above technical problem may include an electrode assembly including a first electrode plate, a second electrode plate, and a separator, a case accommodating the electrode assembly, an integrated terminal portion that is all or partly located inside the case and electrically connected to the first electrode plate and extending outward from the case, and an insulating portion that is installed between the integrated terminal portion located inside the case and an inner surface of the case and blocks electrical connection between the integrated terminal portion and the case.

[0007] In some examples, the insulation may extend along the length of the case.

[0008] In some examples, the insulation may be attached to the side of the integral terminal portion.

[0009] In some examples, the upper side of the insulating portion may be attached to the integral terminal portion, and the lower side of the insulating portion may be located between the first tab provided on the first electrode plate and the inner side of the case.

[0010] In some examples, the insulation may be attached to a first tab provided on the first electrode plate.

[0011] In some examples, the insulation may be an insulating tape attached to the first tab.

[0012] In some examples, one side of the insulation may be attached to the first tab, and the other side of the insulation may extend outside of the first tab.

[0013] In some examples, the insulation may be wound together with the first electrode plate and positioned around the outer periphery of the integral terminal portion.

[0014] In some examples, the insulation may be attached to a side of the electrode assembly and may extend in the longitudinal direction of the case and be positioned on the outer side of the side of the terminal portion integral with the first tab of the first electrode plate.

[0015] In some examples, the insulation may be installed on the inner side of the case facing the integral terminal portion.

[0016] In some examples, the insulation may be an insulating tape attached to the inner surface of the case or an insulating coating coated on the inner surface of the case.

[0017] An exemplary secondary battery according to one embodiment of the present invention may include an electrode assembly including a positive electrode, a negative electrode, and a separator, a case accommodating the electrode assembly, an integrated terminal portion that is located entirely or partially inside the case and electrically connected to the positive electrode and extending outward from the case, and an insulating portion that is installed between the integrated terminal portion located inside the case and an inner surface of the case and blocks electrical connection between the integrated terminal portion and the case.

[0018] In some examples, the integrated terminal portion may include a positive electrode current collector plate that contacts a positive electrode substrate tab provided on the positive electrode and a positive terminal that extends from the positive electrode current collector plate to the outside of the case.

[0019] In some examples, the insulation may be attached to the side of the positive electrode plate.

[0020] In some examples, the upper side of the insulation may be attached to the side of the positive electrode current collector, and the lower side of the insulation may be located between the positive electrode substrate tab and the inner side of the case.

[0021] In some examples, the insulation may be attached to the positive electrode substrate tab.

[0022] In some examples, the insulation is an insulating tape attached to the positive electrode substrate tab, one side of the insulation is attached to the positive electrode substrate tab and the other side may extend to the outside of the positive electrode substrate tab.

[0023] In some examples, the insulation may be wound together with the anode and positioned around the outer perimeter of the anode collector plate.

[0024] In some examples, the insulation is attached to the side of the electrode assembly and may extend lengthwise through the case and be positioned on the outside of the side of the positive electrode substrate tab and the positive electrode current collector.

[0025] In some examples, the insulation may be installed on the inner side of the case facing the positive collector plate.

[0026] In some examples, the insulation may be an insulating tape attached to the inner surface of the case or an insulating coating coated on the inner surface of the case.

[0027] In some examples, the positive electrode plate and the positive terminal may be formed as one piece.

[0028] In some examples, an inner gasket may be further included, which is installed between the positive terminal and the case and blocks the electrical connection between the positive terminal and the case.

[0029] In some examples, the insulation is bonded to the outer periphery of the positive electrode plate and may be located between the case and the positive electrode plate and between the case and the positive electrode substrate tab.

[0030] In some examples, the insulation may include at least one of polyurethane, polytetrafluoroethylene (PTFE), and polyvinyl chloride (PVC).

[0031] In some examples, the insulation may include a support member that supports the lower side of the positive electrode collector plate and is positioned between the case and the positive electrode substrate tab, and a connecting member that extends upward from the support member and is positioned between the positive electrode collector plate and the case.

[0032] In some examples, the insulation may further include a restraining member extending from the connecting member and positioned on the upper side of the positive electrode collector plate.

[0033] In some examples, the restraining member is formed in a ring shape and can be connected to the top of the connecting member.

[0034] In some examples, the restraining member may be a plurality of protrusions spaced apart at a set interval and connected to the top of the connecting member.

[0035] In some examples, the restraining member may be formed of a protrusion having a square or curved surface.

[0036] According to the present invention, insulation is provided between the positive electrode collector plate and the case and between the positive electrode substrate tab and the case, thereby reducing the risk of fire.

[0037] In addition, according to the present invention, since the insulating part is installed in the form of a tape or coating to increase space utilization within the case, a decrease in the capacity of the secondary battery due to the installation of the insulating part can be prevented.

[0038] In addition, according to the present invention, since the insulation is fixed to the outer periphery of the positive electrode collector plate, the mechanical stability of the internal structure of the battery can be strengthened, and the consistency and reliability of battery performance can be ensured by maintaining an accurate gap between the electrodes and minimizing minute movements of the electrodes.

[0039] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects that are not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0040] 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.

[0041] FIG. 1a and FIG. 1b are a perspective view and a cross-sectional view illustrating an exemplary cylindrical secondary battery according to the present invention.

[0042] FIG. 2 is a cross-sectional view showing the upper part of an exemplary cylindrical secondary battery according to the present invention.

[0043] FIG. 3 is an enlarged cross-sectional view showing a state in which an insulating portion is installed on a side of an integrated terminal portion in an exemplary cylindrical secondary battery according to the present invention.

[0044] FIG. 4 is a cross-sectional view showing a state in which the length of the insulating portion is variable in an exemplary cylindrical secondary battery according to the present invention.

[0045] FIG. 5 is a cross-sectional view showing a state in which an insulating portion is attached to a first non-conductive portion in an exemplary cylindrical secondary battery according to the present invention.

[0046] FIG. 6 is an enlarged cross-sectional view showing a state in which an insulating portion is installed on a side of a first non-conductive portion in an exemplary cylindrical secondary battery according to the present invention.

[0047] FIG. 7 is a cross-sectional view showing a state in which the upper side of the insulating portion protrudes toward the upper side of the first collector plate in an exemplary cylindrical secondary battery according to the present invention.

[0048] FIG. 8 is a front view showing an exemplary cylindrical secondary battery according to the present invention in which an insulating part is installed in the first non-conductive part.

[0049] FIG. 9 is a cross-sectional view showing an exemplary cylindrical secondary battery according to the present invention in which an integral insulation part is installed on the side of an electrode assembly and an integral terminal part.

[0050] Fig. 10 is a cross-sectional view showing an exemplary cylindrical secondary battery according to the present invention in which an insulating part is installed on the inner side of the case.

[0051] FIG. 11 is a cross-sectional view showing a state in which an insulating part is installed on the outer edge of a first collector plate in an exemplary cylindrical secondary battery according to the present invention.

[0052] Fig. 12 is an enlarged cross-sectional view showing a state in which an insulating part is installed on the outer edge of an exemplary first collector plate according to the present invention.

[0053] Fig. 13 is a cross-sectional view showing a state in which an insulating part is installed on the outer edge of an exemplary first collector plate according to the present invention.

[0054] Fig. 14 is a partial cutaway perspective view showing a state in which an insulating part is bonded to the outer side of an exemplary first collector plate according to the present invention.

[0055] Fig. 15 is a perspective view showing a state in which an insulating part is bonded to the outer side of an exemplary first collector plate according to the present invention.

[0056] Fig. 16 is a plan view of an exemplary insulating part according to the present invention.

[0057] Fig. 17 is a plan view illustrating another embodiment of an exemplary insulating part according to the present invention.

[0058] Fig. 18 is a plan view illustrating another embodiment of an exemplary insulating part according to the present invention.

[0059] FIG. 19 is a cross-sectional view illustrating another embodiment of an exemplary insulating part according to the present invention.

[0060] FIGS. 20A and 20B are perspective views illustrating a battery pack including an exemplary cylindrical secondary battery according to the present invention.

[0061] FIGS. 21A and 21B are perspective and side views illustrating a vehicle including an exemplary battery pack according to the present invention.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0068] Any configuration being placed “on top (or bottom)” of a component or “on top (or bottom)” of a component may mean not only that any configuration is placed in contact with the top (or bottom) of the component, but also that other configurations may be interposed between the component and any configuration placed on (or under) the component.

[0069] 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 connected to each other, but that other components may also 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.

[0070] When reference is made throughout the specification to “A and / or B,” this means A, B, or A and B, unless otherwise stated. In other words, “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.

[0071] 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.

[0072] FIGS. 1A and 1B are perspective views and cross-sectional views illustrating an exemplary cylindrical secondary battery (100) according to the present invention. As illustrated in FIGS. 1A and 1B, the exemplary secondary battery (100) according to the present invention may include a case (110), an electrode assembly (120), a first current collector (146), a second current collector (130), an integrated terminal portion (140), and an insulating portion (150). In some examples, the exemplary secondary battery (100) may further include a vent plate (160). Furthermore, in some examples, the exemplary secondary battery (100) may further include at least one of an insulating gasket (171), an upper insulating member (172), a cap gasket (173), and an inner gasket (174). In the present invention, the secondary battery (100) may be referred to as a cylindrical secondary battery or battery.

[0073] The case (110) accommodates the electrode assembly (120) and the electrolyte, and together with the vent plate (160) may form the outer shape of the secondary battery (100). The case (110) may include or be referred to as a can, a housing, or an outer material. The case (110) may include a case upper wall (111) having a generally circular shape and a case side wall (112) having a cylindrical shape extending downward from the case upper wall (111). In some examples, the case (110) may be formed in various shapes, such as a pouch shape, in addition to a circular shape. In addition, the case (110) may include a metal such as steel, stainless steel, nickel-plated steel, steel alloy, aluminum, aluminum alloy, and a cooling sheet for deep drawing (SPCE), or a laminate film or plastic forming the pouch. The case side wall (112) may be provided with a beading portion (113) that is recessed toward the inside of the case (110). The lower end of the case side wall (112) may be provided with a crimping portion (114) that is curved toward the inside 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 positioned below the beading portion (113). The beading portion (113) protrudes into the inside of the case (110) to support the lower portion of the electrode assembly (120), thereby preventing the electrode assembly (120) from moving. The crimping portion (114) may press the edge of the vent plate (160) through the cap gasket (173) to firmly fix the vent plate (160).

[0074] The surface inside the case (110) is referred to as the case inner surface (115). At least one of the inner surface of the case upper wall (111) and the inner surface of the case side wall (112) may be referred to as the case inner surface (115).

[0075] An electrode assembly (120) may be accommodated inside a case (110) together with an electrolyte. 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 include a first electrode plate (121), a second electrode plate (122), and a separator (123) between the first electrode plate (121) and the second electrode plate (122), and 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 longitudinal direction (vertically in the vertical direction based on FIG. 1B). In some examples, a center pin (optional) may be coupled to the core (124).

[0076] The first electrode plate (121) may include a first substrate (1211) and a first active material layer (1212) positioned on the first substrate (1211). A first non-conductive portion or first tab (1213) of the first substrate (1211) where the first active material layer (1212) is not positioned may extend outward (e.g., upward), and the first tab (1213) may be electrically connected to the first current collector plate (146) of the integrated terminal portion (140). In the present invention, the first tab (1213) may be referred to as a first non-conductive portion or a positive electrode substrate tab.

[0077] The second electrode plate (122) may include a second substrate (1221) and a second active material layer (1222) positioned on the second substrate (1221). A second non-conductive portion or second tab (1223) of the second substrate (1221) where the second active material layer (1222) is not positioned may extend outward (e.g., downward), and the second tab (1223) may be electrically connected to the second collector plate (130), which may in turn be electrically connected to the case (110). In some examples, the first tab (1213) and the second tab (1223) may extend in opposite directions. In the present invention, the second tab (1223) may be referred to as a second non-conductive portion or a negative electrode substrate tab.

[0078] The first electrode plate (121) can function as an anode. In this case, the first substrate (1211) can be composed of, for example, aluminum foil, and the first active material layer (1212) can include, for example, a transition metal oxide. The second electrode plate (122) can function as an anode. In this case, the second substrate (1221) can be composed of, for example, copper foil or nickel foil, and the second active material layer (1222) can include, for example, graphite and / or silicon.

[0079] The separator (123) can prevent short circuiting between the first electrode plate (121) and the second electrode plate (122) while allowing movement of lithium ions. In some examples, the separator (123) can be positioned on opposite sides of the first electrode plate (121), or on opposite sides of the second electrode plate (122).

[0080] 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.

[0081] 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.

[0082] As an example, a compound represented by any one of the following chemical formulas may be used.

[0083] 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 Dc (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c About 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 About 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).

[0084] 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.

[0085] 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.

[0086] 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.

[0087] Aluminum may be used as the current collector, but is not limited thereto.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] An electrolyte for a lithium secondary battery may include a non-aqueous organic solvent and a lithium salt.

[0098] The above non-aqueous organic solvent acts as a medium through which ions involved in the electrochemical reaction of the battery can move.

[0099] The above 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 thereof.

[0100] Additionally, when using a carbonate solvent, a mixture of cyclic carbonate and chain carbonate can be used.

[0101] As described above, a lithium secondary battery may have a separator between the positive and negative electrodes. Such a separator may be a multilayer film of polyethylene, polypropylene, polyvinylidene fluoride, or two or more layers thereof.

[0102] The above separator may include a porous substrate and a coating layer comprising an organic material, an inorganic material, or a combination thereof, positioned on one or both sides of the porous substrate.

[0103] The above organic material may include a polyvinylidene fluoride-based antibody or a (meth)acrylic polymer.

[0104] 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.

[0105] 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.

[0106] The second collector plate (130) may be connected to the second tab (1223) of the electrode assembly (120). The second collector plate (130) may include or be referred to as a second current collector, a second conductor, or a second conductive plate. In some examples, the second collector plate (130) may be provided in a generally circular disk shape. A plurality of second tabs (1223) extending / protruding from the electrode assembly (120) may be electrically connected to the upper surface of the second collector plate (130). In some examples, the second tabs (1223) may be bent inwardly toward the core (124) or outwardly away from the core (124), and may extend in a straight direction extending vertically. The second tabs (1223) may be laser welded to the upper surface of the second collector plate (130). The second collector plate (130) may include copper, a copper alloy, nickel, a nickel alloy, aluminum, or an aluminum alloy. In some examples, the second collector plate (130) may further include a second collector plate bending portion (1301) that is electrically connected to the case (110) by being sandwiched between the bead portion (113) and the cap gasket (173).

[0107] A cap gasket (173) is installed between the beading portion (113) and the crimping portion (114) of the case (110). The cap gasket (173) is installed along the outer periphery of the vent plate (160), and the edge of the vent plate (160) is inserted into the inside of the cap gasket (173) and joined. The vent plate (160) 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, instead of providing the beading portion (113) and the crimping portion (114), the vent plate (160) may be directly welded to the case side wall (112) or the vent plates (160) may be joined to each other in a curling or seaming manner.

[0108] In some examples, the vent plate (160) may further include a vent notch (161) having a concave groove on an upper surface of the vent plate (160). The vent notch (161) has a thinner thickness than other portions of the vent plate (160). In some examples, the vent plate (160) may include a peripheral region (162) sandwiched between the beading portion (113) and the crimping portion (114), an inner region (163) connected to the peripheral region (162) and lower than the peripheral region (162), and a central region (164) connected to the inner region (163) and higher than the inner region (163). The vent notch (161) may be provided on the inner region (163). In some examples, the central region (164) may be closer to the electrode assembly (120) than the peripheral region (162) and the inner region (163). These vent notches (161) can be ruptured around the vent notches (161) to release internal gas when the internal pressure of the secondary battery (100) is higher than the reference pressure. The vent plate (160) can be made of iron, nickel-plated iron, stainless steel, aluminum, or an aluminum alloy. In some examples, the case (110) and the vent plate (160) coupled thereto may be collectively referred to as the case (110).

[0109] FIG. 2 is a cross-sectional view illustrating the upper portion of an exemplary cylindrical secondary battery (100) according to the present invention, and FIG. 3 is an enlarged cross-sectional view illustrating a state in which an insulating portion (150) is installed on a side of an integrated terminal portion (140) in an exemplary cylindrical secondary battery (100) according to the present invention. As illustrated in FIGS. 2 and 3, the integrated terminal portion (140) may be located entirely or partially on the inside of the case (110). In addition, the integrated terminal portion (140) may extend to the outside of the case (110). The integrated terminal portion (140) according to one embodiment of the present invention includes a first collector plate (146) and a positive terminal (144). The first collector plate (146) and the positive terminal (144) may be a module formed integrally. The first collector plate (146) and the positive terminal (144) may be injection-molded integrally. Alternatively, the first collector plate (146) and the positive terminal (144) can be produced as separate parts and then fixed by welding to form an integrated terminal portion (140), thereby allowing for various modifications. Accordingly, the time and cost required for joining the first collector plate (146) and the positive terminal (144) can be reduced. In the present invention, the first collector plate (146) may be referred to as a positive collector plate. In addition, the positive terminal (144) may include or be referred to as a rivet, a terminal, or a rivet terminal. Accordingly, the positive collector plate and the positive terminal (144) may be formed as one piece.

[0110] In some examples, the integrated terminal portion (140) may include a positive electrode current collector (146) that contacts a positive electrode substrate tab (1213) provided on the positive electrode (121) and a positive electrode terminal (144) that extends from the positive electrode current collector (146) to the outside of the case (110).

[0111] A first collector plate (146) may be connected to a first tab (1213) of an electrode assembly (120). The first collector plate (146) may include or be referred to as a first current collector, a positive current collector plate, a first conductor, or a first conductive plate. In some examples, the first collector plate (146) may be provided in a generally circular disc shape. A plurality of first tabs (1213) extending / protruding from the electrode assembly (120) may be electrically connected to a lower surface of the first collector plate (146). In some examples, the first tabs (1213) may be bent inwardly toward the core (124) or outwardly away from the core (124) and laser welded to the lower surface of the first collector plate (146). The first collector plate (146) may include aluminum, an aluminum alloy, copper, a copper alloy, nickel, or a nickel alloy.

[0112] The positive terminal (144) may be coupled to the case (110) and electrically connected to the electrode assembly (120). The positive terminal (144) 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 upper end of the rivet post (141) and may be positioned on the upper side of the case upper wall (111). The rivet leg (143) may be connected to the lower end of the rivet post (141) and may be positioned on the lower side of the case upper wall (111). In some examples, an insulating gasket (171) may be interposed between the rivet post (141) and the case upper wall (111). In some examples, an upper insulating member (172) may be interposed between the rivet head (142) and the upper side of the case upper wall (111). In some examples, an inner gasket (174) may be installed between the rivet leg (143) and the lower side of the case upper wall (111). The inner gasket (174) is installed between the positive terminal (144) and the case (110), and various modifications are possible within the technical concept of blocking the electrical connection between the positive terminal (144) and the case (110).

[0113] In some examples, the insulating gasket (171), the upper insulating member (172), and the inner gasket (174) may be provided separately. In some examples, the insulating gasket (171), the upper insulating member (172), and the inner gasket (174) may not be integral. The insulating gasket (171) and the upper insulating member (172) may be integrally formed, and the inner gasket (174) may be formed as a separate member. In some examples, the insulating gasket (171), the upper insulating member (172), and the inner gasket (174) may be integrally formed. In some examples, the insulating gasket (171) and the inner gasket (174) may be integrally formed, and the upper insulating member (172) may be formed as a separate member. In some examples, the rivet post (141) may include a rivet recess (1411). In some examples, the rivet leg (143) may be electrically connected to the first collector plate (146). In some examples, the rivet leg (143) and the first collector plate (146) may be formed integrally. In some examples, the rivet leg (143) may be welded to the first collector plate (146) by irradiating a laser beam through the rivet recess (1411). In some examples, after the welding process, the rivet recess (1411) may be filled with metal or closed with a metal plate. The positive terminal (144) may include aluminum, an aluminum alloy, copper, a copper alloy, nickel, or a nickel alloy. In this way, the positive terminal (144) may perform a function of electrically connecting to an external device. In some examples, the case top wall (111) may also perform a function of electrically connecting to an external device.

[0114] By installing the insulating gasket (171) and the upper insulating member (172), the gap between the case (110) and the integrated terminal portion (140) is blocked, thereby preventing leakage of the electrolyte.

[0115] An inner gasket (174) may be interposed between the case (110) and the positive terminal (144). The inner gasket (174) may be in contact with or adhered to the case upper wall (111). In some examples, a portion of the inner gasket (174) may be in contact with or adhered to the rivet post (141).

[0116] The insulating portion (150) is installed between the integrated terminal portion (140) located on the inside of the case (110) and the inner surface of the case (110), and various modifications are possible within the technical concept of blocking the electrical connection between the integrated terminal portion (140) and the case (110). The insulating portion (150) is installed between the inner surface (115) of the case side wall (112) and the first collector plate (146), and can block the electrical connection between the first collector plate (146) and the case (110). The insulating portion (150) 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.

[0117] The insulating portion (150) may be in contact with or adhered to the side periphery of the integrated terminal portion (140). The fact that the insulating portion (150) is in contact with the side periphery of the integrated terminal portion (140) means that the insulating portion (150) can be easily separated from the side periphery of the integrated terminal portion (140). The fact that the insulating portion (150) is adhered to the side periphery of the integrated terminal portion (140) means that the insulating portion (150) is not easily separated from the side periphery of the integrated terminal portion (140). The insulating portion (150) may be fixed to the side periphery of the first collector plate (146) provided in the integrated terminal portion (140).

[0118] The insulating portion (150) can be installed between the integrated terminal portion (140) located on the inside of the case (110) and the inner surface of the case (110). The insulating portion (150) can be variously modified within the technical concept of blocking the electrical connection between the integrated terminal portion (140) and the case (110). By installing the insulating portion (150), a contact short between the case (110) and the electrode assembly (120) and between the case (110) and the first collector plate (146) can be prevented. The positive collector plate referred to as the first collector plate (146) is electrically connected to the first tab (1213). The first tab (1213) is a positive electrode substrate tab, and the positive electrode substrate tab and the positive electrode substrate tab are installed in a shape facing the inner surface (115) of the case. Accordingly, an insulating part (150) is installed between the positive electrode material tab and the inner side of the case (115), and an insulating part (150) is installed between the positive electrode collector plate and the inner side of the case (115), thereby preventing the occurrence of a contact short circuit.

[0119] The positive electrode collector plate has a circular shape, and an insulating portion (150) installed along the periphery of the positive electrode collector plate can extend in the vertical longitudinal direction of the case (110). The insulating portion (150) forms a cylindrical shape and can be attached to a side of the positive electrode collector plate. In some examples, the upper side of the insulating portion (150) is attached to the integrated terminal portion (140), and the lower side of the insulating portion (150) can be located between the first tab (1213) provided on the first electrode plate (121) and the inner surface of the case (110). The upper side of the insulating portion (150) can be attached to the outer periphery of the first collector plate (146). In addition, the lower side of the insulating portion (150) is installed on the outer periphery of the first tab (1213), thereby preventing a contact short between the first tab (1213) and the case (110). That is, the upper side of the insulating portion (150) is attached to the side of the positive electrode collector plate (146), and the lower side of the insulating portion (150) can be located between the positive electrode substrate tab (1213) and the inner side of the case (110). The upper side of the insulating portion (150) can be located on the side of the positive electrode collector plate, and the lower side of the insulating portion (150) can be located on the side of the first electrode plate (121) located on the lower side of the positive electrode substrate tab. Accordingly, the insulating portion (150) can block the positive electrode collector plate and the positive electrode substrate tab from being electrically connected to the inner side of the case (115).

[0120] The insulating portion (150) may include polypropylene, polyethylene, or EPDM (ethylene propylene diene terpolymer) that does not react with the electrolyte. In addition, the insulating portion (150) may include at least one of polyimide, Teflon, and polyester.

[0121] Polyimide has excellent heat resistance, excellent electrical insulation, and chemical stability, providing excellent insulation even in the chemical environment of a battery. Teflon has high heat resistance, chemical stability, and excellent electrical insulation. Polyethylene is flexible, has good electrical insulation, and is durable. Polyester is 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 insulating and sealing material.

[0122] In some examples, the vertical length of the insulating portion (150) may be approximately 3% to 10% of the total vertical length of the case side wall (112). The insulating portion (150) is installed in a shape that surrounds the outer periphery of the integrated terminal portion (140) and the positive electrode substrate tab (1213) located on the inside of the case (110). Therefore, the integrated terminal portion (140) and the positive electrode substrate tab (1213) are insulated from the case side wall (112), thereby preventing the occurrence of an electrical short circuit.

[0123] The insulating portion (150) can be fixed to the side of the integrated terminal portion (140) through methods such as an adhesive, a fastening member, heat fusion, mechanical bonding, or chemical bonding.

[0124] The outer member (151) is installed together with the insulating member (150) and can be modified in various ways within the technical concept of blocking the electrical connection between the electrode assembly (120) and the case (110). The outer member (151) can be installed in a shape that surrounds the outer periphery of the electrode assembly (120). The outer member (151) can be installed between the electrode assembly (120) and the case side wall (112). The outer member (151) can extend in the vertical direction, which is the longitudinal direction of the electrode assembly (120). The outer member (151) is positioned below the insulating member (150), and the lower end of the insulating member (150) and the upper end of the outer member (151) can be installed in a shape that faces or contacts each other. Alternatively, the insulating member (150) and the outer member (151) can be installed in an overlapping state, and various modifications are possible. The outer member (151) may be bonded or fixed to the outside of the electrode assembly (120). The outer member (151) may include polypropylene, polyethylene, or EPDM (ethylene propylene diene terpolymer) that does not react with the electrolyte. The outer member (151) and the insulating member (150) may be made of the same material. If the vertical length of the insulating member (150) is extended, the vertical length of the outer member (151) may be reduced in proportion thereto. Therefore, the sum of the vertical lengths of the insulating member (150) and the outer member (151) may be proportional to the sum of the vertical lengths of the case side wall (112).

[0125] FIG. 4 is a cross-sectional view illustrating a state in which the length of the insulating portion (155) is variable in an exemplary cylindrical secondary battery (100) according to the present invention. As illustrated in FIG. 4, the upper end of the insulating portion (155) may be positioned on the side of the positive electrode current collector (146), and the lower end of the insulating portion (155) may be positioned on the outside of the positive electrode substrate tab (1213). The length of the outer member (151) positioned below the insulating portion (155) increases as the length of the insulating portion (155) decreases. The vertical length of the insulating portion (155) attached to the side of the integrated terminal portion (140) is adjustable, and accordingly, the vertical length of the outer member (151) is also adjusted.

[0126] The upper side of the insulating portion (155) is fixed to the side of the positive electrode collector plate (146), and the lower side of the insulating portion (155) is installed at a position facing the positive electrode substrate tab (1213) without extending downwardly from the positive electrode substrate tab (1213). As the vertical length of the insulating portion (155) decreases, the vertical length of the outer member (151) increases. Accordingly, the insulating portion (155) can block the electrical connection between the positive electrode collector plate (146) and the positive electrode substrate tab (1213) and the inner surface (115) of the case.

[0127] FIG. 5 is a cross-sectional view illustrating a state in which an insulating portion (250) is attached to a first non-stick portion (1213) in an exemplary cylindrical secondary battery (100) according to the present invention, and FIG. 6 is an enlarged cross-sectional view illustrating a state in which an insulating portion (250) is installed on a side surface of a first non-stick portion (1213) in an exemplary cylindrical secondary battery (100) according to the present invention. As illustrated in FIGS. 5 and 6, the insulating portion (250) may be attached to a first tab (1213) provided on a first electrode plate (121). The insulating portion (250) may be an insulating tape attached to the first tab (1213). When the first electrode plate (121) is a positive electrode, the insulating portion (250) may be an insulating tape attached to a positive electrode substrate tab (1213). In some examples, one side of the insulation (250) may be attached to the outer surface of the positive electrode substrate tab (1213) and the other side may extend to the outer side of the positive electrode substrate tab (1213).

[0128] The insulating portion (250) is attached to a portion of the first tab (1213), and the other side of the insulating portion (250) can extend to the outside of the first tab (1213). The insulating portion (250) can be wound together with the first electrode plate (121) and positioned on the outer periphery of the integrated terminal portion (140). The upper side of the insulating portion (250) attached to the outer surface of the first tab (1213) can extend to the upper side of the first tab (1213) and be installed at a position facing the integrated terminal portion (140). Therefore, the insulating portion (250) can block the first tab (1213) and the first collector plate (146) of the integrated terminal portion (140) from electrically contacting the inner surface (115) of the case. A detailed description of the outer member (151) located on the lower side of the insulating member (250) is omitted as it has been described above.

[0129] FIG. 8 is a front view illustrating a state in which an insulating portion (250) is installed in a first non-conductive portion (1213) of an exemplary cylindrical secondary battery (100) according to the present invention. As illustrated in FIG. 8, the insulating portion (250) is attached to the first tab (1213), and the upper side of the insulating portion (250) protrudes outward from the first tab (1213). Therefore, the vertical length of the first tab (1213) is shorter than the vertical length of the insulating portion (250). In addition, the insulating portion (250) is not installed over the entire longitudinal area (left-right direction based on FIG. 8) of the first tab (1213), but is installed starting from one end of the first tab (1213) and extending to a length corresponding to the outer circumference of the first current collector (146). When the first collector plate (146) is formed in a circular shape, assuming that the outer circumference of the first collector plate (146) is 10 cm, the longitudinal length of the insulating portion (250) may be 10 to 12 cm. In other words, the length of the insulating portion (250) may be formed to be 1 to 1.2 times longer than the outer circumference of the first collector plate (146). When the first electrode plate (121) is wound to form the electrode assembly (120), the insulating portion (250) attached to the first tab (1213) may also be wound together with the first electrode plate (121). Alternatively, the insulating portion (250) may be attached or fixed to the outer surface of the first tab (1213) in a state where the electrode assembly (120) including the first electrode plate (121) is wound. In some examples, the insulating member (250) may be wound together with the first electrode plate (121) and positioned on the outer periphery of the positive electrode collector plate (146). Since the insulating member (250) is installed in a shape that surrounds the outer periphery of the first electrode collector plate (146), the phenomenon of the first electrode collector plate (146) and the first tab (1213) coming into contact with the case side wall (112) and being electrically connected can be prevented.

[0130] FIG. 7 is a cross-sectional view illustrating a state in which the upper side of the insulating portion (255) protrudes toward the upper side of the first collector plate (146) in an exemplary cylindrical secondary battery (100) according to the present invention. As illustrated in FIG. 7, the tape-shaped insulating portion (255) attached to the outer side of the first tab (1213) is located between the first collector plate (146) and the case side wall (112). The upper side of the insulating portion (255) may protrude toward the upper side of the first collector plate (146). Therefore, the first collector plate (146) may be prevented from contacting the side wall of the case (110) located in various directions, thereby preventing a short circuit from occurring.

[0131] FIG. 9 is a cross-sectional view illustrating a state in which an integral insulation portion (350) is installed on the side of an electrode assembly (120) and an integral terminal portion (140) in an exemplary cylindrical secondary battery (100) according to the present invention. As illustrated in FIG. 9, the insulation portion (350) is attached to the side of the electrode assembly (120) and extends in the vertical longitudinal direction of the case (110) so as to be positioned on the outer side of the first tab (1213) of the first electrode plate (121) and the side of the integral terminal portion (140). The insulation portion (350) may be attached to the side of the electrode assembly (120) rather than to the first tab (1213) or the side of the first electrode plate (121). The insulation portion (350) may be fixed to at least one of the first active material layer (1212) and the second active material layer (1222). The insulating portion (350) is fixed to the outer surface of the electrode assembly (120), and the upper side of the insulating portion (350) may be located between the first collector plate (146) and the case side wall (112). In some examples, the insulating portion (350) is attached to the side surface of the electrode assembly (120) and may extend in the longitudinal direction of the case (110) to be located on the outer side of the side surface of the positive electrode substrate tab (1213) and the positive electrode collector plate (146). Instead of separate insulators being installed on the side surface of the electrode assembly (120) and the side surface of the integrated terminal portion (140), the insulating portion (350) installed on the side surface of the electrode assembly (120) may be extended and used for insulation of the integrated terminal portion (140). Therefore, the present invention can reduce the number of parts related to insulation, thereby improving productivity.

[0132] This insulating member (350) may include at least one of polypropylene, polyethylene, polyimide, Teflon, polyester, and EPDM (ethylene propylene diene terpolymer) that does not react with the electrolyte.

[0133] FIG. 10 is a cross-sectional view illustrating an exemplary cylindrical secondary battery (100) according to the present invention, in which an insulating member (450) is installed on the inner surface (115) of the case. As illustrated in FIG. 10, the insulating member (450) may be installed on the inner surface of the case (110) facing the integrated terminal member (140). In some examples, the insulating member (450) may be an insulating tape attached to the inner surface of the case (110) or an insulating coating coated on the inner surface of the case (110). The insulating member (450) may be installed on the inner surface (115) of the case facing the first tab (1213) and the integrated terminal member (140) located on the inner surface of the case (110). An outer member (151) may be installed on the side of the electrode assembly (120) to block the electrical connection between the body of the electrode assembly (120) and the inner side surface (115) of the case. The upper end of the insulating member (450) may be positioned facing the first collector plate (146) or positioned higher than the first collector plate. The lower end of the insulating member (450) may be positioned on the upper end of the outer member (151) or overlapping with the outer member (151). The lower end of the insulating member (450) may be aligned with the lower end of the first tab (1213) or positioned lower than the first tab (1213).

[0134] If the insulating part (450) is an insulating tape installed on the inner side of the case (115), the material may be polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyimide, etc.

[0135] When the insulating part (450) is installed in the form of an insulating coating, it may be made of organic rubber or plastic. The insulating coating is applied equally to the inside of the case (110), and its durability can be improved through a subsequent drying or hardening process.

[0136] FIG. 11 is a cross-sectional view illustrating a state in which an insulating member (600) is installed on the outer edge of a first current collector (146) in an exemplary cylindrical secondary battery (100) according to the present invention, and FIG. 12 is an enlarged cross-sectional view illustrating a state in which an insulating member (600) is installed on the outer edge of an exemplary first current collector (146) according to the present invention. As illustrated in FIGS. 11 and 12, since the insulating member (600) is fixed to the outer periphery of the positive electrode current collector (146), the mechanical stability of the internal structure of the battery (100) can be enhanced, and the consistency and reliability of the performance of the battery (100) can be ensured by maintaining an accurate gap between electrodes and minimizing minute movements of the electrodes. The insulating member (600) is a structure that is coupled to the outer periphery of the positive electrode current collector (146) and may be made of an insulator. In addition, if a certain distance between the electrodes is maintained, ion transfer between the electrolyte and the electrodes can be more smoothly performed, thereby improving the charging and discharging efficiency of the battery (100).

[0137] When the insulation (600) is fixed along the outer periphery of the positive electrode collector (146), physical contact between the case (110) and the positive electrode collector (146) and between the case (110) and the positive electrode substrate tab (1213) is blocked, thereby preventing accidental short circuit. Accordingly, the safety of the battery (100) can be greatly improved.

[0138] And, an insulating part (600) can be combined with a positive electrode collector plate (146) to form a single module, and through the fixing design of this insulating part (600), assembly of the battery (100) is possible without a separate fixing operation or additional components, thereby simplifying the manufacturing process and reducing costs.

[0139] The insulating member (600) according to one embodiment of the present invention may include at least one of polyurethane, polytetrafluoroethylene (PTFE), and polyvinyl chloride (PVC).

[0140] The insulating portion (600) of the secondary battery is installed between the positive electrode collector (146) and the case (110) to ensure electrical separation and maintain chemical stability. To perform these functions, the material of the insulating portion (600) must have certain electrical insulation properties while also possessing chemical resistance to the electrolyte. Therefore, the material of the insulating portion (600) can be various materials within the technical concept as long as it has appropriate insulation properties, chemical stability, thermal stability, and mechanical strength according to the requirements of the secondary battery (100).

[0141] Polyurethane has high electrical insulation properties and strong resistance to chemicals such as electrolytes, thereby improving the safety and durability of secondary batteries (100). Furthermore, polyurethane has high thermal stability and can maintain its performance even within the operating temperature range of the secondary battery (100). Furthermore, polyurethane has high flexibility and strength, allowing it to withstand physical stresses resulting from expansion and contraction of the secondary battery (100).

[0142] Polytetrafluoroethylene (PTFE) possesses properties that resist almost all chemicals and possesses chemical resistance that is advantageous in protecting the insulation (600) from corrosion or decomposition caused by electrolytes. Furthermore, polytetrafluoroethylene maintains its chemical and physical properties even at high temperatures, providing thermal stability that allows for use at high temperatures. Furthermore, the surface of polytetrafluoroethylene is very smooth and non-sticky, preventing contamination or adhesion of electrolytes.

[0143] Polyvinyl chloride (PVC) is an insulator with excellent electrical properties and is resistant to various chemicals such as electrolytes.

[0144] FIG. 13 is a cross-sectional view showing a state in which an insulating member (600) is installed on the outer edge of an exemplary first collector plate (146) according to the present invention, FIG. 14 is a partial cut-away perspective view showing a state in which an insulating member (600) is coupled to the outer edge of an exemplary first collector plate (146) according to the present invention, and FIG. 15 is a perspective view showing a state in which an insulating member (600) is coupled to the outer edge of an exemplary first collector plate (146) according to the present invention. As shown in FIGS. 13 to 15, the insulating member (600) coupled to the edge of the positive collector plate (146) may extend in a ring shape. A groove may be formed on the side of the insulating member (600) facing the positive collector plate (146) into which the positive collector plate (146) is inserted. An insulating member (600) according to one embodiment of the present invention may include a support member (610), a connecting member (620), and a restraining member (630). The support member (610), the connecting member (620), and the restraining member (630) may be formed integrally, or, if necessary, may be formed as separate members and then assembled, and various modifications are possible.

[0145] The support member (610) supports the lower side of the positive electrode collector plate (146) and can be modified in various ways within the technical concept of being located between the case (110) and the positive electrode substrate tab (1213). The support member (610) can be installed in contact with the lower surface of the positive electrode collector plate (146). The upper side of the support member (610) can be installed in contact with the lower side of the positive electrode collector plate (146), and the lower side of the support member (610) can be installed in contact with the electrode assembly (120). The support member (610) can be installed in a shape facing the side surface of the positive electrode substrate tab (1213).

[0146] The connecting member (620) can be modified in various ways within the technical concept of extending upwardly from the support member (610) and positioned between the positive collector plate (146) and the case (110). The connecting member (620) is positioned on the outside of the positive collector plate (146) and can extend in a ring shape. The vertical length of the connecting member (620) can be equal to or longer than the vertical length (or thickness) of the positive collector plate (146). By installing the connecting member (620), the phenomenon of the side surface of the positive collector plate (146) coming into contact with the case (110) can be prevented.

[0147] Fig. 16 is a plan view of an exemplary insulating member (600) according to the present invention. As illustrated in Figs. 14 and 16, a restraining member (630) extends from a connecting member (620) and is positioned on the upper side of a positive electrode collector plate (146), and can prevent the positive electrode collector plate (146) from being separated from the support member (610). The restraining member (630) is formed in a ring shape and can be connected to the upper end of the connecting member (620). The restraining member (630) extends in a ring shape and functions to prevent the positive electrode collector plate (146) from being detached during the production process and to block electrical contact between the upper surface of the positive electrode collector plate (146) and the upper wall of the case (110).

[0148] Fig. 17 is a plan view illustrating another embodiment of an exemplary insulating member (600) according to the present invention. As illustrated in Fig. 17, the restraining member (640) may have a plurality of protrusion shapes and may be connected to the upper end of the connecting member (620) at a set interval. The restraining member (640) may have a protrusion shape extending from the connecting member (620) toward the center of the insulating member (600). The center of the insulating member (600) may coincide with the core (124) illustrated in Fig. 11. The restraining member (640) according to one embodiment of the present invention may be formed of a square protrusion. The restraining member (640) may be installed with four protrusions spaced apart from each other at a set interval.

[0149] Fig. 18 is a plan view illustrating another embodiment of an exemplary insulating member (600) according to the present invention. As illustrated in Fig. 18, the restraining member (650) may be formed as a protrusion having a curved surface. Since the restraining member (650) forms a protrusion close to a semicircular shape, the possibility of the positive electrode collector (146) colliding with the restraining member (650) and being damaged when coupled to the insulating member (600) may be reduced. A plurality of restraining members (650) having a curved surface may be provided, and may be spaced apart at a set interval.

[0150] Fig. 19 is a cross-sectional view illustrating another embodiment of an exemplary insulating member (602) according to the present invention. As illustrated in Fig. 19, the insulating member (602) may be provided with only a supporting member (610) and a connecting member (620). The cross-section of the insulating member (602) that is provided with the supporting member (610) and the connecting member (620) and supports the positive electrode collector plate (146) may be formed in an L shape. Various modifications are possible, such as the supporting member (610) and the positive electrode collector plate (146) being fixed by an adhesive or the like.

[0151] The battery according to the above-described embodiment can be used to manufacture a battery pack.

[0152] FIGS. 20A and 20B are perspective views illustrating a battery pack (300) including an exemplary cylindrical secondary battery (100) according to the present invention. Referring to FIGS. 20A and 20B, 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. In the drawings, for convenience of illustration, components such as a bus bar, a cooling unit, and an external terminal for electrically connecting battery cells 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-wheeled vehicle or a two-wheeled vehicle.

[0153] Figures 21a and 21b are perspective views and side views illustrating a vehicle (400, 500) including an exemplary battery pack (300) according to the present invention. In Figure 8a, 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.

[0154] As illustrated in FIG. 21b, the 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 the vehicle 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 the vehicle body component (400).

[0155] 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 idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. An electrode assembly including a first electrode plate, a second electrode plate, and a separator; A case accommodating the electrode assembly; An integrated terminal portion located entirely or partially on the inside of the case, electrically connected to the first electrode plate, and extending to the outside of the case; and An insulating portion installed between the integrated terminal portion located on the inside of the case and the inner surface of the case, and blocking electrical connection between the integrated terminal portion and the case; A secondary battery characterized in that the insulating portion extends in the longitudinal direction of the case.

2. In paragraph 1, A secondary battery characterized in that the insulating part is attached to a side of the integrated terminal part.

3. In paragraph 2, The upper side of the above insulating part is attached to the integrated terminal part, A secondary battery characterized in that the lower side of the insulating portion is located between the first tab provided on the first electrode plate and the inner surface of the case.

4. In paragraph 1, A secondary battery, characterized in that the insulating part is attached to the first tab provided on the first electrode plate.

5. In paragraph 4, The above insulating part is an insulating tape attached to the first tab, A secondary battery characterized in that one side of the insulating part is attached to the first tab and the other side extends outside the first tab.

6. In paragraph 5, A secondary battery characterized in that the insulating portion is wound together with the first electrode plate and positioned on the outer periphery of the integrated terminal portion.

7. In paragraph 1, The above insulating part is attached to the side of the electrode assembly, A secondary battery characterized in that it extends in the longitudinal direction of the case and is located on the outer side of the first tab of the first electrode plate and the side of the integrated terminal portion.

8. In paragraph 1, A secondary battery characterized in that the insulating part is installed on the inner side of the case facing the integrated terminal part.

9. In paragraph 8, A secondary battery characterized in that the insulating part is an insulating tape attached to the inner surface of the case or an insulating coating coated on the inner surface of the case.

10. Electrode assembly including a positive electrode, a negative electrode, and a separator; A case accommodating the electrode assembly; An integrated terminal portion located entirely or partially on the inside of the case, electrically connected to the anode, and extending to the outside of the case; and An insulating portion installed between the integrated terminal portion located on the inside of the case and the inner surface of the case, and blocking electrical connection between the integrated terminal portion and the case; The above-mentioned integrated terminal portion comprises: a positive electrode current collector plate in contact with a positive electrode material tab provided on the positive electrode; and A secondary battery comprising a positive terminal extending from the positive electrode collector plate and extending to the outside of the case.

11. In paragraph 10, A secondary battery characterized in that the insulating part is attached to the side of the positive electrode collector plate.

12. In paragraph 11, The upper side of the above insulating part is attached to the side of the positive electrode collector plate, A secondary battery characterized in that the lower side of the insulating portion is located between the positive electrode substrate tab and the inner surface of the case.

13. In paragraph 10, A secondary battery characterized in that the insulating part is attached to the positive electrode substrate tab.

14. In paragraph 13, The above insulating part is an insulating tape attached to the positive electrode substrate tab, A secondary battery characterized in that one side of the insulating part is attached to the positive electrode substrate tab and the other side extends to the outside of the positive electrode substrate tab.

15. In paragraph 14, A secondary battery characterized in that the insulating member is wound together with the positive electrode and positioned on the outer periphery of the positive electrode current collector plate.

16. In paragraph 10, The above insulating part is attached to the side of the electrode assembly, A secondary battery characterized in that it extends in the longitudinal direction of the case and is positioned on the outer side of the positive electrode substrate tab and the positive electrode current collector plate.

17. In paragraph 10, A secondary battery characterized in that the insulating part is installed on the inner side of the case facing the positive electrode collector plate.

18. In paragraph 17, A secondary battery characterized in that the insulating part is an insulating tape attached to the inner surface of the case or an insulating coating coated on the inner surface of the case.

19. In paragraph 10, A secondary battery characterized in that the positive electrode collector plate and the positive electrode terminal are formed as one piece.

20. In paragraph 10, A secondary battery further comprising an inner gasket installed between the positive terminal and the case and blocking electrical connection between the positive terminal and the case.

21. In paragraph 10, A secondary battery characterized in that the insulating member is bonded to the outer periphery of the positive electrode current collector and is located between the case and the positive electrode current collector and between the case and the positive electrode substrate tab.

22. In paragraph 10, A secondary battery characterized in that the insulating part comprises at least one of polyurethane, polytetrafluoroethylene (PTFE), and polyvinyl chloride (PVC).

23. In paragraph 10, The insulating member comprises a support member that supports the lower side of the positive electrode current collector and is located between the case and the positive electrode substrate tab; and A secondary battery including a connecting member extending upwardly from the support member and positioned between the two-sided current collector plates and the case.

24. In paragraph 23, A secondary battery characterized in that the insulating member further includes a restraining member extending from the connecting member and positioned on the upper side of the positive electrode current collector plate.

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