Secondary battery

Abstract

The present disclosure provides a secondary battery including: a case having a cylindrical shape; an electrode assembly in the case and including a first tab protruding in a first direction at a central portion and a second tab protruding in the first direction at an outer periphery; a first current collector plate in the case and electrically connected to the first tab; a second current collector plate electrically connecting the second tab to the case; and a crimp terminal electrically connected to the first current collector plate and passing through the housing.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0082637 filed in the Korean Intellectual Property Office on June 27, 2023, and Korean Patent Application No. 10-2023-0172095 filed in the Korean Intellectual Property Office on December 1, 2023, the disclosures of which are incorporated herein in their entirety by reference. Technical Field

[0002] The present disclosure relates to a secondary battery. Background Art

[0003] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be charged and discharged. Low-capacity batteries in which one battery cell is packaged in the form of a group have been mainly used in small portable electronic devices such as smart phones and digital cameras. Large-capacity batteries in the form of modules in which dozens or hundreds of battery packs are connected have been used as power sources for driving motors in hybrid vehicles, electric vehicles or drones, or as energy storage devices.

[0004] A rechargeable secondary battery may include an electrode assembly having a separator interposed between positive and negative electrode plates, a current collector plate electrically connected to the electrode assembly, a terminal electrically connected to the current collector plate, and a case accommodating the electrode assembly and the current collector plate and to which the terminal is coupled.

[0005] The above information disclosed in the art serving as background art of the present disclosure is only for improving understanding of the background art of the present disclosure and thus may include information that does not constitute related art. Summary of the invention

[0006] The present disclosure provides a secondary battery having low resistance and a short current path by arranging a first tab (e.g., a positive electrode tab) and a second tab (e.g., a negative electrode tab) of an electrode assembly in the same direction so that they are electrically connected to a first terminal (e.g., a riveted terminal) and a second terminal (e.g., a housing), respectively.

[0007] The present disclosure provides a secondary battery that allows a relatively large electrode assembly to be accommodated inside a case by having a first collector plate (e.g., a positive electrode collector plate) and a second collector plate (e.g., a negative electrode collector plate) that are three-dimensionally combined and arranged in the same area to occupy a relatively small volume in the internal space of the case.

[0008] The present disclosure provides a secondary battery having a suitable flatness between a first terminal (eg, a riveted terminal) and a second terminal (eg, a housing) by disposing a conductive ring plate on the second terminal.

[0009] A secondary battery according to one or more embodiments of the present disclosure may include: a shell having a cylindrical shape; an electrode assembly in the shell and including a first tab protruding in a first direction at a central portion and a second tab protruding in the first direction at a periphery; a first current collector plate in the shell and electrically connected to the first tab; a second current collector plate electrically connecting the second tab to the shell; and a riveted terminal electrically connected to the first current collector plate and passing through the shell.

[0010] The planar shape of the first terminal piece may be a circular ring having a center.

[0011] The second terminal tab may be spaced apart from the first terminal tab, and may have a planar shape as a circular ring having a center.

[0012] The diameter of the first terminal lug may be smaller than the diameter of the second terminal lug.

[0013] The secondary battery may further include a separator between the first tab and the second tab.

[0014] The first collector plate may include: a first collector plate first connection region, electrically connected to the first terminal tab; a first collector plate connection region, bent from the first collector plate first connection region and extending from the first collector plate first connection region in a first direction; and a first collector plate second connection region, bent from the first collector plate connection region and extending from the first collector plate connection region to be electrically connected to the riveted terminal.

[0015] The first current collector plate connection region may extend from an inner periphery of the first current collector plate first connection region.

[0016] The planar shape of the second connection region of the first current collector plate may be a triangle.

[0017] The second collector plate may include: a second collector plate first connection region, electrically connected to the second terminal tab; a second collector plate connection region, bent from the second collector plate first connection region and extending from the second collector plate first connection region in a first direction; and a second collector plate second connection region, bent from the second collector plate connection region and extending from the second collector plate connection region to be electrically connected to the shell.

[0018] The planar shape of the first connection region of the second current collector plate may be a circular ring having a center.

[0019] The second current collector plate connection region may extend from an outer periphery of the second current collector plate first connection region.

[0020] The planar shape of the second connection region of the second current collector plate may be a circular ring having a center.

[0021] The secondary battery may further include an insulating plate between the first current collector plate and the second current collector plate.

[0022] The secondary battery may further include a conductive ring plate attached to the case at a periphery of the riveted terminal.

[0023] The first collector plate may include: a first connection area of ​​the first collector plate, electrically connected to the first terminal tab; a first collector plate connection area, bent from the first connection area of ​​the first collector plate and extending from the first connection area of ​​the first collector plate in a first direction; and a second connection area of ​​the first collector plate, bent from the first collector plate connection area and extending from the first collector plate connection area to be electrically connected to the riveted terminal, wherein the second collector plate includes: a second collector plate first connection area, electrically connected to the second terminal tab; a second collector plate connection area, bent from the second collector plate first connection area and extending from the second collector plate first connection area in the first direction; and a second collector plate second connection area, bent from the second collector plate connection area and extending from the second collector plate connection area to be electrically connected to the shell.

[0024] The first connection region of the first current collector plate and the first connection region of the second current collector plate may be in the same plane, wherein the second connection region of the first current collector plate is closer to the electrode assembly than the second connection region of the second current collector plate.

[0025] The housing may include a riveting plate combined with the riveting terminal, a side wall integrally extending from the riveting plate in a second direction opposite to the first direction, and a termination plate closing one end of the side wall.

[0026] The termination plate may include a safety vent.

[0027] The terminating plate may be fixed to the side wall by means of a crimping portion and a compression portion provided on the side wall.

[0028] The termination plates may be welded to the side walls.

[0029] The housing may include a rivet plate combined with the rivet terminal, a side wall welded to the rivet plate and extending in a second direction opposite to the first direction, and a termination plate integrally extended from the side wall.

[0030] The termination plate may include a safety vent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1A and Figure 1B are a perspective view and a cross-sectional view respectively illustrating a secondary battery according to one or more embodiments of the present disclosure.

[0032] Figure 2A and Figure 2B1 and 2 are a plan view and a perspective view respectively illustrating an electrode assembly of a secondary battery according to one or more embodiments of the present disclosure.

[0033] Figure 3 is a plan view illustrating a developed state of an electrode assembly of a secondary battery according to one or more embodiments of the present disclosure.

[0034] Figure 4A and Figure 4B sectional view and perspective view respectively illustrate a current collector plate assembly of a secondary battery according to one or more embodiments of the present disclosure.

[0035] Figure 5 is a schematic diagram illustrating a laser welding method in a method of manufacturing a secondary battery according to one or more embodiments of the present disclosure.

[0036] Figure 6 is a cross-sectional view illustrating a secondary battery according to one or more embodiments of the present disclosure.

[0037] Figure 7 is a cross-sectional view illustrating a secondary battery according to one or more embodiments of the present disclosure.

[0038] Figure 8 is a cross-sectional view illustrating a secondary battery according to one or more embodiments of the present disclosure. DETAILED DESCRIPTION

[0039] By referring to the detailed description and drawings of the embodiments, it is easier to understand the aspects of some embodiments of the present disclosure and the methods for implementing them. The described embodiments are provided as examples so that the present disclosure will be thorough and complete, and will fully convey the aspects of the present disclosure to those skilled in the art. Therefore, redundant, irrelevant or unrelated to the description of the embodiments, or processes, elements and techniques that are not necessary for a person of ordinary skill in the art to fully understand the aspects of the present disclosure can be omitted. Unless otherwise noted, throughout the drawings and written descriptions, the same reference numerals, characters or combinations thereof represent the same elements, and therefore, their repeated descriptions can be omitted.

[0040] The described embodiments may have various modifications and may be embodied in different forms, and should not be construed as being limited to the embodiments shown here. When describing an embodiment, the use of "may", "may" or "may not" corresponds to one or more embodiments of the present disclosure. The present disclosure covers all modifications, equivalents and replacements within the conceptual and technical scope of the present disclosure. In addition, each of the features of the various embodiments of the present disclosure may be partially or completely combined with each other, and various interlocks and drives are technically possible. The various embodiments may be implemented independently of each other, or may be implemented together in association.

[0041] In the drawings, the relative sizes of elements, layers, and regions may be exaggerated for clarity and / or descriptive purposes. In addition, the use of cross-hatching and / or shading in the drawings is generally provided to clarify the boundaries between adjacent elements. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, ratio, commonality between the elements shown, and / or any other characteristic, attribute, property, etc. of an element.

[0042] Various embodiments are described herein with reference to cross-sectional views as schematic diagrams of embodiments and / or intermediate structures. As such, variations in the illustrated shapes due to, for example, manufacturing techniques and / or tolerances are anticipated. In addition, for the purpose of describing embodiments according to the concepts of the present disclosure, the specific structures or functional descriptions disclosed herein are merely illustrative. Therefore, the embodiments disclosed herein should not be interpreted as being limited to the illustrated shapes of elements, layers, or regions, but rather include shape deviations caused by, for example, manufacturing.

[0043] For ease of explanation, spatial relative terms such as "under ...", "below ...", "lower", "under ...", "below ...", "above ...", "upper", "upper side", etc. may be used here to describe the relationship between an element or feature and another (some) element or feature as shown in the figure. It will be understood that, in addition to the orientation depicted in the figure, the spatial relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the figure is turned over, the element described as "under" other elements or features "under" or "below" will then be oriented to "above" the other elements or features. Therefore, the example terms "under ..." and "under ..." can cover both upper and lower orientations. The device can be oriented in addition (for example, rotated 90 degrees or in other orientations), and the spatial relative descriptors used here should be interpreted accordingly. Similarly, when a first part is described as being arranged "on" a second part, this means that the first part is arranged at the upper or lower side (not limited to its upper side) of the second part based on the direction of gravity.

[0044] In addition, the phrase "in a plan view" refers to when the object portion is viewed from above, and the phrase "in a schematic cross-sectional view" refers to when a schematic cross-section taken by vertically cutting the object portion is viewed from the side. The term "overlapping" or variations thereof means that a first object can be above or below or to one side of a second object, and vice versa. In addition, the term "overlapping" may include stacking, facing or facing, extending over, covering or partially covering, or any other suitable term that will be appreciated and understood by a person of ordinary skill in the art. The expression "non-overlapping" may include meanings such as "spaced apart from" or "placed aside" or "offset from" and any other suitable equivalents that will be appreciated and understood by a person of ordinary skill in the art.

[0045] It will be understood that when an element, layer, region, or component is referred to as being "formed on," "on" another element, layer, region, or component, "connected to," or "(operably or communicatively) coupled to" another element, layer, region, or component, it may be directly formed on, directly on, directly connected to, or directly coupled to the other element, layer, region, or component, or indirectly formed on, indirectly on, indirectly connected to, or indirectly coupled to the other element, layer, region, or component, such that there may be one or more intervening elements, layers, regions, or components. Additionally, this may collectively refer to direct or indirect coupling or connection, as well as integral or non-integral coupling or connection. For example, when a layer, region, or component is referred to as being "electrically connected" or "electrically coupled" to another layer, region, or component, it may be directly electrically connected or directly electrically coupled to the other layer, region, and / or component, or there may be one or more intervening layers, regions, or components. The one or more intervening components may include switches, resistors, capacitors, and the like. When describing the embodiments, unless explicitly described as directly connected, the expression of connection indicates electrical connection, and "directly connected / directly coupled to" or "directly on" means that one component is directly connected or coupled to another component, or is directly on another component without intervening components.

[0046] In addition, in this specification, when a part of a layer, film, region, plate, etc. is formed on another part, the formation direction is not limited to the upper direction, but includes forming the part on the side surface or in the lower direction. On the contrary, when a part of a layer, film, region, plate, etc. is formed "below" another part, this includes not only the case where the part is "directly under" the other part, but also the case where there is another part between the part and the other part. At the same time, other expressions describing the relationship between components, such as "between...", "directly between..." or "adjacent to..." and "directly adjacent to..." can be similarly interpreted. It will be understood that when an element or layer is referred to as "between" two elements or layers, it can be the only element or layer between the two elements or layers, or one or more intermediate elements or layers may also be present.

[0047] For the purposes of this disclosure, expressions such as "at least one of..." or "any one of..." or "one or more of..." modify the entire list of elements when preceding or following a list of elements, without modifying the individual elements in the list. For example, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, any combination of two or more of X, Y, and Z (such as XYZ, XY, YZ, and XZ as examples), or any variation thereof. Similarly, the expression "at least one of A and B" may include A, B, or A and B. As used herein, "or" generally means "and / or", and the term "and / or" includes any and all combinations of one or more of the associated listed items. For example, the expression "A and / or B" may include A, B, or A and B. Similarly, expressions such as “at least one of,” “a plurality of,” “one of,” and other prepositional phrases when preceding or following a list of elements modify the entire list of elements and do not modify the individual elements of the list.

[0048] It will be understood that, although the terms "first", "second", "third" etc. can be used here to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms do not correspond to a specific order, position or priority, and are only used to distinguish an element, member, component, region, area, layer, section or part from another element, member, component, region, area, layer, section or part. Therefore, without departing from the spirit and scope of the present disclosure, the first element, component, region, layer or part described below can be referred to as the second element, component, region, layer or part. Describing an element as a "first" element may not require or imply the presence of a second element or other elements. The terms "first", "second" etc. can also be used here to distinguish elements of different categories or groups. For simplicity, the terms "first", "second" etc. can respectively represent "first category (or first group)", "second category (or second group)" etc.

[0049] The terms used herein are only used for the purpose of describing the embodiments, and are not intended to limit the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular forms "one" and "one (kind / person)" are also intended to include plural forms, and the plural forms are also intended to include singular forms. It will also be understood that when the terms "include", "have", "comprise" and variations thereof are used in this specification, the features, wholes, steps, operations, elements and / or components stated are indicated, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their groups are not excluded.

[0050] When one or more embodiments can be implemented differently, a specific process order can be performed differently from the described order. For example, two consecutively described processes can be performed substantially simultaneously or in a reverse order to the described order.

[0051] As used herein, the terms "substantially", "about", "approximately" and similar terms are used as approximate terms rather than as terms of degree, and are intended to explain the inherent deviations of measured or calculated values ​​that will be recognized by those of ordinary skill in the art. For example, "substantially" may include a range of + / -5% of the corresponding value. Taking into account the measurement discussed and the errors associated with the measurement of a specific amount (i.e., the limitations of the measurement system), as used herein, "about" or "approximately" includes the stated values ​​and refers to the acceptable deviation range of the specific value as determined by those of ordinary skill in the art. For example, "about" may refer to within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value. In addition, when describing embodiments of the present disclosure, the use of "may" refers to "one or more embodiments of the present disclosure".

[0052] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. It will also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and / or this specification, and should not be interpreted in an idealized or overly formal sense, unless explicitly defined as such herein.

[0053] Figure 1A and Figure 1B 1 and 2 are perspective views and cross-sectional views respectively showing a secondary battery 100 according to one or more embodiments of the present disclosure. Figure 1A and Figure 1B As shown in , a secondary battery 100 according to one or more embodiments of the present disclosure may include a case 110 , an electrode assembly 120 , a current collector plate assembly 130 , and a rivet terminal 140 .

[0054] The housing 110 may be provided in an approximately cylindrical shape. The housing 110 may include an approximately disk-shaped riveted plate 111 having a terminal hole 1111 at its center, a sidewall 112 extending in a downward direction from the riveted plate 111, and a termination plate 113 configured to close the lower end of the sidewall 112. The housing 110 may include or may be referred to as a can, a housing, or an external material. The housing 110 may include steel, a steel alloy, nickel-plated steel, aluminum, an aluminum alloy, copper, or a copper alloy. The housing 110 may be manufactured by a deep drawing process in which a metal plate is placed on a die having an opening and pressed by a punch to manufacture a cylindrical housing, by an extrusion process in which a molten metal is placed in an extrusion die and extruded into a tubular housing, or by a bending and welding process in which a thin metal plate is rolled into a cylindrical shape and bent and welded to manufacture a housing. The housing 110 is used to accommodate the electrode assembly 120, the collector plate assembly 130, and (optional) electrolytes, and isolate them from the external environment.

[0055] In one or more embodiments, the side wall 112 and the termination plate 113 may be provided integrally. In one or more embodiments, the rivet plate 111 and the side wall 112 may be provided separately (separately) and then may be combined with each other by laser welding. In one or more embodiments, the rivet plate 111 and the side wall 112 may be combined with each other by crimping / crimping, crimping or seaming. In one or more embodiments, the rivet plate 111 and the side wall 112 may be provided integrally. In one or more embodiments, the side wall 112 and the termination plate 113 may be provided separately (separately) and then may be welded and combined with each other. In one or more embodiments, the side wall 112 and the termination plate 113 may be combined with each other by crimping / crimping, crimping or seaming.

[0056] In one or more embodiments, the termination plate 113 may include a vent recess 1134 disposed in an upper surface thereof, so that the termination plate 113 is relatively thin at the vent recess 1134. The vent recess 1134 may include a safety vent, or may be referred to as a safety vent. If the internal pressure of the secondary battery is higher than a reference pressure, the vent recess 1134 ruptures to release internal gas.

[0057] The electrode assembly 120 may be provided in a generally cylindrical shape. The electrode assembly 120 may be wound into a cylindrical shape and then may be coupled to the housing 110. The electrode assembly 120 may include or may be referred to as an electrode group or a core. The electrode assembly 120 may include a first electrode plate 121 (e.g., a positive electrode plate), a second electrode plate 122 (e.g., a negative electrode plate), and a separator 123. In one or more embodiments, the first electrode plate 121 (e.g., a positive electrode plate), the separator 123, and the second electrode plate 122 (e.g., a negative electrode plate) may be wound into an approximately cylindrical shape while being stacked. The first electrode plate 121 may include a first tab 1211 extending in an upward direction at the approximate center of the electrode assembly 120. The second electrode plate 122 may include a second tab 1221 extending in an upward direction at the approximate periphery of the electrode assembly 120. The upward direction may be defined as a first direction, and a downward direction opposite to the upward direction may be defined as a second direction.

[0058] In one or more embodiments, the first electrode plate 121 may be provided by applying a first active material 1213 (such as a transition metal oxide) to a first current collector 1212 formed of a metal foil (such as aluminum), and may include a first tab 1211 extending in an upward direction at the approximate center of the first current collector 1212 (e.g., an area not coated with the first active material 1213). The extended and protruding first tab 1211 may be referred to as a first uncoated tab or a first substrate tab, and the first tab 1211 may be provided by a winding process, a substrate stamping process, or a substrate slotting process of the electrode assembly 120 to form a plurality of tabs. In one or more embodiments, the first tab 1211 may include a lead tab that is separately provided and welded to the first current collector 1212.

[0059] In one or more embodiments, a compound capable of reversibly inserting and extracting lithium (lithiated inserting compound) can be used as the first active material. In one or more embodiments, at least one of a composite oxide of lithium and a metal selected from cobalt, manganese, nickel, iron or a combination thereof can be used.

[0060] The composite oxide may be a lithium transition metal composite oxide, and examples thereof may include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, nickel manganese cobalt-free-based oxides, or combinations thereof.

[0061] In the examples, a compound represented by any one of the following chemical formulas may be used: Li a A 1-b X b O 2-c D c (where 0.90≤a≤1.8, 0≤b≤0.5, and 0≤c≤0.05); Li a Mn 2-b X b O 4-c D c (where 0.90≤a≤1.8, 0≤b≤0.5, and 0≤c≤0.05); Li a Ni 1-b-c Co b X c O 2-α D α (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, and 0<α<2); Li a Ni 1-b-c Mn b X c O 2-α D α (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, and 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, and 0≤e≤0.1); Li a NeG b O2 (where 0.90≤a≤1.8 and 0.001≤b≤0.1); Li a CoG b O2 (where 0.90≤a≤1.8 and 0.001≤b≤0.1); Li a Mn 1-b G b O2 (where 0.90≤a≤1.8 and 0.001≤b≤0.1); Li a Mn b O4 (where 0.90≤a≤1.8 and 0.001≤b≤0.1); Li aMn 1-g G g PO4 (where 0.90≤a≤1.8 and 0≤g≤0.5); Li (3-f) Fe2(PO4)3(0≤f≤2); and Li a FeOP4 (where 0.90≤a≤1.8).

[0062] In the above formula, A is Ni, Co, Mn or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element or a combination thereof; D is O, F, S, P or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V or a combination thereof; and L 1 It is Mn, Al or a combination thereof.

[0063] In one or more embodiments, the positive electrode for a lithium secondary battery may include a current collector (e.g., a first current collector) and a positive electrode active material layer (e.g., a first active material layer) formed on the current collector. The positive electrode active material layer includes a positive electrode active material and may also include a binder and / or a conductive material.

[0064] In one or more embodiments, the content of the positive electrode active material may be about 90 wt % to about 99.5 wt % based on 100 wt % of the positive electrode active material layer, and the content of each of the binder and the conductive material may be about 0.5 wt % to about 5 wt % based on 100 wt % of the positive electrode active material layer.

[0065] The first tab 1211 is electrically connected to the first current collector plate 131 and the rivet terminal 140 to serve as a current flow path between the first electrode plate 121 and the rivet terminal 140 .

[0066] In one or more embodiments, the second electrode plate 122 may be provided by applying a second active material 1223 (such as graphite or carbon) to a second current collector 1222 formed of a metal foil (such as copper or nickel), and may include a second tab 1221 (e.g., an area not coated with the second active material 1223) extending and protruding in an upward direction from the approximate periphery of the second current collector 1222. The extended and protruding second tab 1221 may be referred to as a second uncoated tab or a second substrate tab, and the second tab 1221 may be provided by a winding process, a substrate stamping process, or a substrate slotting process of the electrode assembly 120 to form a plurality of tabs. In one or more embodiments, the second tab 1221 may include a lead tab that is separately provided and welded to the second current collector 1222. The second tab 1221 is electrically connected to a second terminal (e.g., the housing 110) to serve as a current flow path between the second electrode plate 122 and the housing 110.

[0067] In one or more embodiments, the second active material includes a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, a lithium metal alloy, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0068] Materials capable of reversibly intercalating / deintercalating lithium ions may include, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon may be graphite (such as natural graphite or artificial graphite), and examples of amorphous carbon may include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0069] Si-based negative electrode active materials or Sn-based negative electrode active materials may be used as materials capable of doping and dedoping lithium. Si-based negative electrode active materials may include silicon, a silicon-carbon composite, SiO x (0 < x < 2), a Si-based alloy, or a combination thereof.

[0070] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one or more embodiments, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0071] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core containing crystalline carbon and silicon particles, and an amorphous carbon coating positioned on the surface of the core.

[0072] The negative electrode for a lithium secondary battery may include a current collector (e.g., a second current collector) and a negative electrode active material layer (e.g., a second 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.

[0073] For example, the negative electrode active material layer may include about 90 wt% to about 99 wt% of the negative electrode active material, about 0.5 wt% to about 5 wt% of the binder, and about 0 wt% to about 5 wt% of the conductive material. A non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof may be used as the binder. If an aqueous binder is used as the negative electrode binder, a cellulose-based compound capable of imparting viscosity may also be included.

[0074] The diaphragm 123 may be placed between the first electrode plate 121 and the second electrode plate 122 to reduce or prevent the possibility of a short circuit between the first electrode plate 121 and the second electrode plate 122, and to enable lithium ions to move. The diaphragm 123 is formed to be slightly wider than the width of each of the first electrode plate 121 and the second electrode plate 122, so that the diaphragm 123 may protrude more upward, downward, leftward and / or rightward than each of the first electrode plate 121 and the second electrode plate 122. In one or more embodiments, the diaphragm 123 may reduce or prevent the possibility of direct contact between the first electrode plate 121 and the second electrode plate 122 and the housing 110 in the upward, downward, leftward and / or rightward directions of the electrode assembly 120. In one or more embodiments, the diaphragm 123 may protrude in the upward and downward directions of the electrode assembly 120 where the first tab 1211 and the second tab 1221 are not present and may extend (e.g., may extend a predetermined length).

[0075] In one or more embodiments, the electrode assembly 120 may be hollow in a substantially central region, and the hollow central region may be referred to as a core 124. If the internal pressure of the secondary battery is greater than a reference pressure, the core 124 may serve as a path through which the pressure is released. In one or more embodiments, the internal pressure may be applied to the termination plate 113 through the core 124, and eventually the exhaust recess 1134 of the termination plate 113 may be destroyed so that the internal pressure may be reduced.

[0076] In one or more embodiments, the electrode assembly 120 may be housed in the housing 110 with the electrolyte. The electrolyte solution may include an organic solvent such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) and / or dimethyl carbonate (DMC) and a lithium salt such as LiPF6 and LiBF4. In one or more embodiments, the electrolyte may be in a liquid phase, a solid phase, or a gel phase.

[0077] The current collector plate assembly 130 may include a first current collector plate 131 and a second current collector plate 132. The current collector plate assembly 130 may further include an insulating plate 133.

[0078] The first current collector plate 131 may electrically connect the first electrode plate 121 of the electrode assembly 120 to the riveted terminal 140. The first current collector plate 131 may include or may be referred to as a current collector, a conductor, or a conductive lead. The first current collector plate 131 may be made of aluminum or an aluminum alloy. The first current collector plate 131 may be manufactured by stamping a metal plate using a mold and a punch or by casting a molten metal. In one or more embodiments, the first current collector plate 131 may include a first current collector plate first connection region 1311, a first current collector plate connection region 1312, and a first current collector plate second connection region 1313. The first current collector plate first connection region 1311 may be electrically connected to the above-mentioned first tab 1211 having an approximately circular ring shape by a method such as laser welding. The first current collector plate connection region 1312 may be bent from the first current collector plate first connection region 1311 and may extend in an upward direction. The first current collector plate second connection region 1313 may be bent from the first current collector plate connection region 1312 and may extend to be electrically connected to the riveted terminal 140 by a method such as laser welding. In this manner, the first current collector plate 131 may serve as a current flow path between the electrode assembly 120 and the rivet terminal 140 .

[0079] The second collector plate 132 may electrically connect the second electrode plate 122 of the electrode assembly 120 to the housing 110 (e.g., the riveted plate 111). The second collector plate 132 may include or may be referred to as a collector, a conductor, or a conductive lead. The second collector plate 132 may be made of copper, a copper alloy, nickel, or a nickel alloy. The second collector plate 132 may be manufactured by stamping a metal plate using a mold and a punch or by casting a molten metal. In one or more embodiments, the second collector plate 132 may include a second collector plate first connection region 1321, a second collector plate connection region 1322, and a second collector plate second connection region 1323. The second collector plate first connection region 1321 may be electrically connected to the above-mentioned second terminal tab 1221 having an approximately circular ring shape by a method such as laser welding. The second collector plate connection region 1322 may be bent from the second collector plate first connection region 1321 and may extend in an upward direction. The second collector plate second connection region 1323 may be bent from the second collector plate connection region 1322 and may extend to be electrically connected to the case 110 (e.g., the riveted plate 111) by a method such as laser welding. In this manner, the second collector plate 132 may serve as a current flow path between the electrode assembly 120 and the case 110.

[0080] The insulating plate 133 may be placed between the first collector plate 131 and the second collector plate 132. In one or more embodiments, the insulating plate 133 may be arranged on substantially the same horizontal plane as the first collector plate 131 and the second collector plate 132. In one or more embodiments, a partial area of ​​the insulating plate 133 may be placed between the second collector plate second connection region 1323 and the electrode assembly 120. The insulating plate 133 may include or may be referred to as an insulator, an insulating block, or an insulating spacer. The insulating plate 133 may be made of polypropylene, polyethylene, ethylene propylene diene monomer (EPDM), or nylon that does not react with the electrolyte. In one or more embodiments, the first collector plate 131, the second collector plate 132, and the insulating plate 133 may be manufactured by a double injection method.

[0081] The riveted terminal 140 may pass through the housing 110 and may be coupled to the housing 110. In one or more embodiments, the riveted terminal 140 may pass through and may be coupled to a terminal hole 1111 provided in the riveted plate 111. In one or more embodiments, an insulating gasket 1431 may be placed between the riveted terminal 140 and the terminal hole 1111. In one or more embodiments, the riveted terminal 140 may include a relatively wide head 141 and a relatively narrow body 142, the body 142 extending from the head 141 in a downward direction to pass through the terminal hole 1111. In one or more embodiments, the riveted terminal 140 may also include a recess 1411, which is provided at a depth (e.g., a predetermined depth) from the head 141 toward the body 142. The thickness between the upper surface of the riveted terminal 140 (i.e., the head 141) and the lowermost surface of the riveted terminal 140 corresponding to the lower surface of the main body 142 can be relatively reduced by the recess 1411, so that the energy of the laser beam is well transmitted to the first collector plate 131 (e.g., the second connection area 1313 of the first collector plate), thereby allowing the riveted terminal 140 and the first collector plate 131 to be laser welded to each other. In one or more embodiments, the upper insulator 1432 may also be placed between the head 141 and the riveted plate 111. In one or more embodiments, the lower insulator 1433 may also be placed at the periphery of the main body 142 passing through the riveted plate 111. In one or more embodiments, the lower insulator 1433 may be placed between the collector plate assembly 130 and the riveted plate 111. In one or more embodiments, the recess 1411 may present a specific surface with a substantially flat member (e.g., a metal piece) after the welding process. In one or more embodiments, after the welding process, the metal member may be coupled to the recess 1411 , or the upper end of the recess 1411 may be closed.

[0082] In this way, the present disclosure can provide a secondary battery 100 having low resistance and a short current path by arranging the first tab 1211 (e.g., a positive electrode tab) and the second tab 1221 (e.g., a negative electrode tab) of the electrode assembly 120 in the same direction (e.g., in an upward direction) so that they are electrically connected to the first terminal (e.g., a riveted terminal 140) and the second terminal (e.g., the housing 110), respectively. In one or more embodiments, the present disclosure can provide a secondary battery 100 that allows a relatively large electrode assembly 120 to be accommodated inside the housing 110 by having a first collector plate 131 (e.g., a positive electrode collector plate) and a second collector plate 132 (e.g., a negative electrode collector plate) that are three-dimensionally combined and arranged in the same area to occupy a relatively small volume in the internal space of the housing 110.

[0083] Figure 2A and Figure 2B 1 and 2 are respectively a plan view and a perspective view showing an electrode assembly 120 of a secondary battery 100 according to one or more embodiments of the present disclosure. Figure 2A and Figure 2B As shown in , the electrode assembly 120 according to one or more embodiments of the present disclosure may include a first tab 1211 protruding and extending in an upward direction at an approximately central region thereof, and a second tab 1221 protruding and extending in an upward direction at an approximately peripheral region thereof. In one or more embodiments, the first tab 1211 and the second tab 1221 may have different diameters around a core 124 (e.g., an empty space) at the center.

[0084] In one or more embodiments, the planar shape of the first tab 1211 may be an approximately circular ring shape having the same width. In one or more embodiments, the planar shape of the second tab 1221 may be an approximately circular ring shape having the same width, whose diameter is relatively larger than the diameter of the first tab 1211. In one or more embodiments, the planar shape of the diaphragm 123 may be an approximately circular ring shape having the same width between the first tab 1211 and the second tab 1221. In one or more embodiments, a partial area of ​​the diaphragm 123 may protrude and may extend into an area where the first tab 1211 and the second tab 1221 do not protrude and extend. In one or more embodiments, the upper side of the first tab 1211, the upper side of the second tab 1221, and the upper side of the diaphragm 123 may be substantially coplanar with each other. As will be described again below, the planar shape of the first tab 1211 may be the same or similar to the planar shape of the first current collector plate first connection region 1311. As will be described again below, the planar shape of the second tab 1221 may be the same as or similar to the planar shape of the second current collector plate first connection region 1321 .

[0085] Figure 3 1 is a plan view showing an expanded state of an electrode assembly 120 of a secondary battery according to one or more embodiments of the present disclosure. Figure 3 In each of the first electrode plate 121 and the second electrode plate 122 , the left end is a winding start end (a portion where winding starts), and the right end is a winding end end (a portion where winding ends). For convenience of description, the separator is not shown.

[0086] like Figure 3 As shown in , the first terminal piece 1211 can be provided by a substrate stamping method. In one or more embodiments, the first terminal piece 1211 can be closer to the winding start end than the winding end end, and the horizontal width of the first terminal piece 1211 can be greater than its vertical width. In one or more embodiments, during the winding process, one first terminal piece 1211 can be wound multiple times at the winding start end, so that the planar shape of the first terminal piece 1211 can be approximately a circular ring shape. Figure 3 As shown in , the second terminal tab 1221 can be set by a substrate stamping method. In one or more embodiments, the second terminal tab 1221 can be closer to the winding end end than the winding start end, and the horizontal width of the second terminal tab 1221 can be greater than its vertical width. In one or more embodiments, during the winding process, a second terminal tab 1221 can be wound multiple times at the winding end end, so that the planar shape of the second terminal tab 1221 can be approximately annular. In one or more embodiments, the first terminal tab 1211 and the second terminal tab 1221 can be set by a method in which a slot is made after stamping the substrate. In one or more embodiments, the first terminal tab 1211 and the second terminal tab 1221 can be separately provided and connected to the first electrode plate 121 and the second electrode plate 122, respectively.

[0087] Figure 4A and Figure 4B 1 and 2 are a cross-sectional view and a perspective view respectively showing a current collector plate assembly 130 of a secondary battery 100 according to one or more embodiments of the present disclosure. Figure 4A and Figure 4B As shown in , the collector plate assembly 130 may include a first collector plate 131 , a second collector plate 132 , and an insulating plate 133 .

[0088] The first collector plate 131 may include a first collector plate first connection region 1311, a first collector plate connection region 1312, and a first collector plate second connection region 1313. In one or more embodiments, the planar shape of the first collector plate first connection region 1311 may be an approximately circular ring shape with a center. In one or more embodiments, the first collector plate connection region 1312 may be bent at a partial region inside the first collector plate first connection region 1311 (e.g., a partial region of the inner circumference of the first collector plate first connection region 1311), and may extend in an upward direction. In one or more embodiments, the first collector plate second connection region 1313 may be bent from the first collector plate connection region 1312, and may extend in an approximately inward horizontal direction. In one or more embodiments, the planar shape of the first collector plate second connection region 1313 may be approximately triangular, square, or circular.

[0089] In one or more embodiments, in the first current collector plate first connection region 1311, a plurality of welding lines in the form of straight lines or circular lines may be radially arranged, and the first terminal tab 1211 and the first current collector plate first connection region 1311 may be electrically connected to each other through the welding lines. In one or more embodiments, the first terminal tab 1211 may be pressed or bent in an inward or outward direction and may be welded to the first current collector plate first connection region 1311. In one or more embodiments, in the first current collector plate second connection region 1313, a plurality of welding lines may be arranged in a ring shape, and the rivet terminal 140 and the first current collector plate second connection region 1313 may be electrically connected to each other through the welding lines.

[0090] In one or more embodiments, the planar shape of the first collector plate first connection region 1311 may be the same as or similar to the planar shape of the first tab 1211. In one or more embodiments, the first collector plate first connection region 1311 may have a shape overlapping the first tab 1211.

[0091] The second collector plate 132 may include a second collector plate first connection region 1321, a second collector plate connection region 1322, and a second collector plate second connection region 1323. In one or more embodiments, the planar shape of the second collector plate first connection region 1321 may be an approximately circular ring shape with a center. In one or more embodiments, the diameter of the second collector plate first connection region 1321 may be greater than the diameter of the first collector plate first connection region 1311. In one or more embodiments, the second collector plate first connection region 1321 may be spaced apart from the first collector plate first connection region 1311. In one or more embodiments, the second collector plate connection region 1322 may be bent at the entire outer region (e.g., periphery) of the second collector plate first connection region 1321 and may extend in an upward direction. In one or more embodiments, the second collector plate second connection region 1323 may be bent from the second collector plate connection region 1322 and may extend in an approximately outward horizontal direction. In one or more embodiments, the second collector plate second connection region 1323 may have an approximately circular ring shape with a center. In one or more embodiments, the center of the first collector plate first connection region 1311 and the center of the second collector plate second connection region 1323 may share the same center point. In one or more embodiments, the center point may coincide with the center of the core 124 of the electrode assembly 120.

[0092] In one or more embodiments, in the second collector plate first connection region 1321, a plurality of welding lines in the form of straight lines or circular lines may be radially arranged, and the second terminal tab 1221 and the second collector plate first connection region 1321 may be electrically connected to each other through the welding lines. In one or more embodiments, the second terminal tab 1221 may be pressed or bent in an inward or outward direction and may be welded to the second collector plate first connection region 1321. In one or more embodiments, in the second collector plate second connection region 1323, a plurality of welding lines may be arranged in the shape of circular lines, and the housing 110 (e.g., the rivet plate 111) and the second collector plate second connection region 1323 may be electrically connected to each other through the welding lines.

[0093] In one or more embodiments, the planar shape of the second collector plate first connection region 1321 may be the same as or similar to the planar shape of the second tab 1221. In one or more embodiments, the second collector plate first connection region 1321 may have a shape overlapping the second tab 1221.

[0094] In one or more embodiments, the first current collector plate first connection region 1311 and the second current collector plate first connection region 1321 may be positioned at the same or similar plane, and the first current collector plate second connection region 1313 may be positioned closer to the electrode assembly 120 than the second current collector plate second connection region 1323. In one or more embodiments, the current collector plate assembly 130 is provided with a compact thickness and thus occupies a relatively small volume inside the secondary battery 100. In one or more embodiments, a relatively large electrode assembly 120 may be provided inside the secondary battery 100.

[0095] The insulating plate 133 may be disposed between the first collector plate 131 and the second collector plate 132. In one or more embodiments, a partial region of the insulating plate 133 may also be disposed between the second collector plate second connection region 1323 and the electrode assembly 120. In one or more embodiments, the planar shape of the insulating plate 133 may be a circular ring shape having a center. In one or more embodiments, the first collector plate 131, the second collector plate 132, and the insulating plate 133 may be manufactured by a double injection method so that an integrated collector plate assembly 130 may be formed.

[0096] Figure 5 is a schematic diagram showing a laser welding method in a method of manufacturing a secondary battery 100 according to one or more embodiments of the present disclosure. Figure 5 As shown in FIG. 1 , a laser beam is applied to the concave portion 1411 of the rivet terminal 140 so that the main body 142 of the rivet terminal 140 can be electrically connected to the second connection region 1313 of the first current collector plate. In one or more embodiments, referring to Figure 5 , a laser beam is applied along the periphery of the case 110 (eg, the rivet plate 111 ) so that the rivet plate 111 may be electrically connected to the second connection region 1323 of the second current collector plate.

[0097] In this manner, a first current path is provided through the first terminal (e.g., the riveted terminal 140), the first current collector plate 131, and the first electrode plate 121, and a second current path is provided through the second terminal (e.g., the housing 110 or the riveted plate 111), the second current collector plate 132, and the second electrode plate 122. In one or more embodiments, the internal resistance of the secondary battery 100 can be reduced by providing relatively short first and second current paths.

[0098] Figure 6 2 is a cross-sectional view showing a secondary battery 200 according to one or more embodiments of the present disclosure. In addition to further providing a conductive ring plate 210, Figure 6 The secondary battery 200 shown in FIG. Figure 1A and Figure 1BThe secondary battery 100 shown in FIG. Figure 6 As shown in , the conductive ring plate 210 can be mechanically / electrically attached to a partial area of ​​the housing 110 as the periphery of the riveted terminal 140 (e.g., on the riveted plate 111). In one or more embodiments, the conductive ring plate 210 can be welded to the riveted plate 111 by a laser beam. The conductive ring plate 210 can be provided with a material similar to or the same as the material of the riveted plate 111. In one or more embodiments, the upper surface of the conductive ring plate 210 can be at a similar or the same plane as the upper surface of the riveted terminal 140. In one or more embodiments, the busbars connected to the riveted terminal 140 and the conductive ring plate 210 can have the same height. In one or more embodiments, the upper surface of the conductive ring plate 210 can be lower than the upper surface of the riveted terminal 140. In one or more embodiments, the busbars connected to the riveted terminal 140 and the conductive ring plate 210 can have different heights.

[0099] In this way, the present disclosure can provide a secondary battery 200 having suitable flatness between a first terminal (e.g., a riveted terminal 140) and a second terminal (e.g., the housing 110) by setting a conductive ring plate 210 on the second terminal (e.g., the riveted plate 111 of the housing 110).

[0100] Figure 7 1 is a cross-sectional view showing a secondary battery 300 according to one or more embodiments of the present disclosure. In addition to the termination plate 313 being coupled to the side wall 112 of the housing 110 by the provided curling portion 1121 and the crimping portion 1122, Figure 7 The secondary battery 300 shown in FIG. Figure 1A and Figure 1B The secondary battery 100 shown in FIG. Figure 7 As shown in , the inwardly concave crimping portion 1121 and the inwardly bent crimping portion 1122 may be optionally provided at the lower end of the side wall 112 of the housing 110. In one or more embodiments, the terminating plate 313 may be coupled between the crimping portion 1121 and the crimping portion 1122. In one or more embodiments, the insulating gasket 114 may be positioned between the crimping portion 1121 and the crimping portion 1122 so that the terminating plate 313 may be coupled while the insulating gasket 114 is interposed between the crimping portion 1121 and the crimping portion 1122. Instead of providing the crimping portion 1121 and the crimping portion 1122, the terminating plate 313 may be directly welded to the side wall 112, or the terminating plate 313 may be coupled to the side wall 112 by a crimping method or a seaming method.

[0101] In one or more embodiments, the termination plate 313 may include a relatively thin exhaust recess 3134 defined by its upper surface. In one or more embodiments, the termination plate 313 may include a peripheral region 3131 fitted between the curling portion 1121 and the crimping portion 1122, an inner region 3132 connected to the peripheral region 3131 and lower than the peripheral region 3131, and a central region 3133 connected to the inner region 3132 and higher than the inner region 3132. The exhaust recess 3134 may be at the inner region 3132. In one or more embodiments, the central region 3133 may be closer to the electrode assembly 120 than the peripheral region 3131 and the inner region 3132. The exhaust recess 3134 may include a safety vent, or may be referred to as a safety vent.

[0102] In one or more embodiments, the termination plate 313 may further include an injection hole 3135 and a plug 3136. The injection hole 3135 may be provided in or defined by the termination plate 313 (e.g., the central region 3133), and the injection hole 3135 may be closed by the plug 3136. In one or more embodiments, the electrolyte may be injected through the injection hole 3135, and the injection hole 3135 may be closed by the plug 3136, thereby reducing or preventing leakage of the electrolyte. In one or more embodiments, such an injection hole and plug may be provided in the riveted plate 111, which may be applicable to all of the above embodiments.

[0103] Figure 8 1 is a cross-sectional view showing a secondary battery 400 according to one or more embodiments of the present disclosure. In addition to the termination plate 313 being welded and fixed to the side wall 112 of the housing 110, Figure 8 The secondary battery 400 shown in FIG. Figure 7 The secondary battery 300 shown in FIG. Figure 8 As shown in , the termination plate 313 can be fixed to the side wall 112 of the shell 110 by laser welding. In one or more embodiments, after the termination plate 313 is bonded to the side wall 112 of the shell 110, a laser beam can be irradiated to the portion where the periphery of the termination plate 313 contacts the side wall 112. In one or more embodiments, the periphery of the termination plate 313 and a partial area of ​​the side wall 112 are melted and cooled so that the termination plate 313 can be bonded to the side wall 112 of the shell 110. As described above, according to one or more embodiments of the present disclosure, by providing a non-curling secondary battery 400, the space occupied by the curling portion and the crimping portion can be eliminated. The present disclosure can provide a relatively high-capacity secondary battery 400 by allowing a relatively large electrode assembly 120 to be accommodated in the shell 110.

[0104] The present disclosure can provide a secondary battery having low resistance and a short current path by arranging a first tab (e.g., a positive electrode tab) and a second tab (e.g., a negative electrode tab) of an electrode assembly in the same direction so that they are electrically connected to a first terminal (e.g., a riveted terminal) and a second terminal (e.g., a shell), respectively.

[0105] The present disclosure can provide a secondary battery that allows a relatively large electrode assembly to be accommodated inside a shell by having a first collector plate (e.g., a positive electrode collector plate) and a second collector plate (e.g., a negative electrode collector plate) that are three-dimensionally combined and arranged in the same area to occupy a small volume in the internal space of the shell.

[0106] The present disclosure may provide a secondary battery having appropriate flatness between a first terminal (eg, a riveted terminal) and a second terminal (eg, a housing) by providing a conductive ring plate on the second terminal.

[0107] The above description is only for implementing one or more embodiments of the secondary battery according to one or more embodiments of the present disclosure, and the present disclosure is not limited to the above embodiments. As claimed in the attached claims and the functional equivalents to be included therein, aspects of the present disclosure include the scope in which a person skilled in the art can make various changes without departing from the concept of the present disclosure.

Claims

1. A secondary battery, comprising: a housing having a cylindrical shape; an electrode assembly in the case and including a first tab protruding in a first direction at a central portion and a second tab protruding in the first direction at an outer circumference; a first current collector plate in the housing and electrically connected to the first terminal tab; a second current collector plate electrically connecting the second terminal tab to the housing; as well as A riveting terminal is electrically connected to the first current collector plate and passes through the case.

2. The secondary battery according to claim 1, wherein The planar shape of the first connecting piece is a circular ring with a center.

3. The secondary battery according to claim 1, wherein The second terminal tab is spaced apart from the first terminal tab and has a planar shape that is a circular ring having a center.

4. The secondary battery according to claim 1, wherein A diameter of the first terminal lug is smaller than a diameter of the second terminal lug. 5 . The secondary battery according to claim 1 , further comprising a separator between the first tab and the second tab.

6. The secondary battery according to claim 1, wherein The first current collector plate comprises: a first connection region of the first current collector plate, electrically connected to the first terminal tab; a first collector plate connection region bent from the first collector plate first connection region and extending from the first collector plate first connection region in the first direction; and A first collector plate second connection region is bent from the first collector plate connection region and extends from the first collector plate connection region to be electrically connected to the rivet terminal.

7. The secondary battery according to claim 6, wherein The first current collector plate connection region extends from an inner periphery of the first current collector plate first connection region.

8. The secondary battery according to claim 6, wherein The planar shape of the second connection region of the first current collector plate is a triangle.

9. The secondary battery according to claim 1, wherein The second current collector plate comprises: a first connection region of the second current collector plate, electrically connected to the second terminal tab; a second collector plate connection region bent from the second collector plate first connection region and extending from the second collector plate first connection region along the first direction; and A second collector plate second connection region is bent from the second collector plate connection region and extends from the second collector plate connection region to be electrically connected to the case.

10. The secondary battery according to claim 9, wherein The planar shape of the first connection region of the second current collector plate is a circular ring with a center.

11. The secondary battery according to claim 9, wherein The second current collector plate connection region extends from an outer periphery of the second current collector plate first connection region.

12. The secondary battery according to claim 9, wherein The planar shape of the second connection region of the second current collector plate is a circular ring with a center. 13 . The secondary battery according to claim 1 , further comprising an insulating plate between the first current collector plate and the second current collector plate. 14 . The secondary battery according to claim 1 , further comprising a conductive ring plate attached to the case at a periphery of the riveted terminal.

15. The secondary battery according to claim 1, wherein The first current collector plate includes: a first current collector plate first connection region electrically connected to the first terminal tab; a first current collector plate connection region bent from the first current collector plate first connection region and extending from the first current collector plate first connection region in the first direction; and a first current collector plate second connection region bent from the first current collector plate connection region and extending from the first current collector plate connection region to be electrically connected to the riveted terminal, and Wherein, the second current collector plate includes: a second current collector plate first connection area, electrically connected to the second terminal tab; a second current collector plate connection area, bent from the second current collector plate first connection area and extending from the second current collector plate first connection area along the first direction; and a second current collector plate second connection area, bent from the second current collector plate connection area and extending from the second current collector plate connection area to be electrically connected to the shell.

16. The secondary battery according to claim 15, wherein The first connection region of the first current collector plate and the first connection region of the second current collector plate are in the same plane, and The second connection region of the first current collector plate is closer to the electrode assembly than the second connection region of the second current collector plate.

17. The secondary battery according to claim 1, wherein The housing includes a rivet plate combined with the rivet terminal, a side wall integrally extending from the rivet plate in a second direction opposite to the first direction, and a termination plate closing one end of the side wall.

18. The secondary battery according to claim 17, wherein The termination plate includes a safety vent.

19. The secondary battery according to claim 17, wherein The terminating plate is fixed to the side wall by a crimping portion and a crimping portion provided on the side wall.

20. The secondary battery according to claim 17, wherein The termination plate is welded to the side wall.

21. The secondary battery according to claim 1, wherein The housing includes a rivet plate combined with the rivet terminal, a side wall welded to the rivet plate and extending in a second direction opposite to the first direction, and a termination plate integrally extending from the side wall.

22. The secondary battery according to claim 21, wherein The termination plate includes a safety vent.

Images