Method of Manufacturing Battery

Abstract

A method for manufacturing a battery according to the present invention comprises: a step of preparing a battery housing having a bottom portion having one side open and a through hole provided on the other side; a step of fixing an electrode terminal in the through hole; a step of preparing an electrode assembly having a first electrode tab formed of a first blank portion and a second electrode tab formed of a second blank portion, respectively, on the upper and lower sides; a step of inserting the electrode assembly into the battery housing through an open end provided on one side of the battery housing such that the first electrode tab faces the bottom portion; (e) a step of electrically connecting the first electrode tab and the electrode terminal; and a step of covering the open end with a cap plate to finish it.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing a battery, and more specifically, to a method for manufacturing a battery having a structure in which both a positive terminal and a negative terminal are arranged adjacently on one side of a cylindrical battery without significantly modifying the structure of a conventional cylindrical battery. Background Technology

[0002] When manufacturing a battery pack using cylindrical batteries, typically multiple cylindrical batteries are placed upright within a housing, and the top and bottom ends of the batteries are utilized as the positive and negative terminals, respectively, to electrically connect the multiple cylindrical batteries to one another.

[0003] When the positive and negative terminals of a cylindrical battery are located on opposite sides, electrical connection components, such as busbars for electrically connecting multiple cylindrical batteries, must be applied to both the upper and lower parts of the cylindrical battery. This complicates the electrical connection structure of the battery pack.

[0004] Furthermore, in conventional cylindrical battery structures, components for insulation and for ensuring waterproofing or sealing must be applied individually to the upper and lower parts of the battery pack, which leads to an increase in the number of components and structural complexity.

[0005] Therefore, in order to simplify the electrical connection structure of multiple cylindrical batteries, there is a need to develop a cylindrical battery having a structure in which the positive and negative terminals are applied in the same direction.

[0006] In addition, when configuring both a positive and a negative terminal at one axial end, if the internal structure of the cylindrical battery equipped with both terminals is complex, manufacturing costs may increase and problems may arise where energy density cannot be increased.

[0007] In addition, when configuring both the positive and negative terminals at one axial end, it is necessary to appropriately secure the area of ​​both the positive terminal and the negative terminal in a simple manner.

[0008] In addition, when configuring both a positive terminal and a negative terminal at one axial end, it is necessary for both terminals to provide a surface that facilitates the connection of electrical connection components.

[0009] Meanwhile, when a first electrode terminal and a second electrode terminal are provided at one axial end and the other axial end of a cylindrical battery, respectively, the fact that insulation treatment between the bottom surface functioning as a terminal and the bottom of the pack housing is absolutely necessary when configuring a battery pack with the cylindrical battery in an upright position is also a factor that increases manufacturing costs. The problem to be solved

[0010] The present invention, conceived in consideration of the aforementioned problems, aims to provide a cylindrical battery having a structure in which a positive terminal and a negative terminal are applied in the same direction.

[0011] One objective of the present invention is to secure a sufficient area for welding the electrode terminals of a cylindrical battery to an electrical connection component, such as a busbar for manufacturing a battery pack, in a case where a plurality of cylindrical batteries are to be electrically connected in one direction.

[0012] The present invention aims to provide a cylindrical battery having both a positive terminal and a negative terminal on the bottom side of a battery housing that can be manufactured first regardless of whether an electrode assembly is inserted, in a battery housing having an open end and a bottom.

[0013] The present invention aims to provide a cylindrical battery that can appropriately secure both the area of ​​the positive terminal and the area of ​​the negative terminal at the bottom of the battery housing, which can be manufactured first regardless of whether an electrode assembly is inserted, and has a surface that facilitates the connection of the two terminals with an electrical connection component.

[0014] The present invention has the objective of providing a structure in which both a positive terminal and a negative terminal are exposed on one side of a cylindrical battery, while no terminals are exposed on the surface of the other side.

[0015] The present invention aims to provide a cylindrical battery that can increase energy density by allowing an electrode assembly to be closely positioned on the bottom side where both terminals are present.

[0016] The technical problems of the present invention are not limited to the purposes mentioned above, and other unmentioned purposes and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the purposes and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0017] The cylindrical battery of the present invention for solving the above-mentioned problem comprises a cylindrical battery housing having one side open and a bottom portion on the other side, wherein both electrode terminals are provided on the bottom portion of the cylindrical battery housing.

[0018] The bottom portion of the battery housing can be machined before inserting the electrode assembly accommodated in the battery housing. That is, the two electrode terminals to be provided in the bottom portion have a high degree of machining freedom.

[0019] Accordingly, the bottom portion can be processed to be flat through a simple process, and if the outer surface of the bottom portion is configured as a first electrode terminal, electrical connection components and electrical wiring work for connecting thereto can be facilitated.

[0020] In addition, by forming a through hole in the bottom portion and fixing an electrode terminal that serves as the second electrode terminal therein, both electrodes can be formed in the bottom portion of the battery housing.

[0021] Since the above electrode terminal can also be processed before inserting the electrode assembly, the electrode terminal can be processed flat through a simple process, and electrical connection components and electrical wiring work for connecting thereto can be facilitated.

[0022] The portion of the electrode terminal that is exposed further outward than the bottom portion may be shaped to extend further outward in the radial direction than the inner circumference of the through hole. Additionally, the portion of the electrode terminal that extends further outward in the radial direction than the through hole may be processed first when preparing the electrode terminal itself.

[0023] Therefore, the dimension in which the electrode terminal extends radially further outward than the through hole can be determined simply and precisely. In addition, when mass-producing cylindrical batteries, the variation between mass-produced products in the area of ​​the two electrode terminals provided at the bottom of the battery housing can be easily minimized.

[0024] The present invention allows an electrode assembly to be inserted into the interior of a battery housing while two electrode terminals are already provided in the bottom portion of the battery housing. Accordingly, the electrode assembly can be accommodated so as to be as close as possible to or in close contact with the bottom portion of the battery housing.

[0025] The present invention allows for the simple formation of an electrical connection structure between an electrode assembly and two electrode terminals at the bottom portion of a battery housing provided with two electrode terminals. This structure results in a structure that further increases the energy density inside the battery housing.

[0026] In the battery of the present invention, since both electrode terminals are provided at the bottom of the cylindrical battery housing, the structure for closing the open end of the cylindrical battery housing can be simplified.

[0027] This finishing can be achieved by a cap plate, which has the advantage of not having to be polar.

[0028] Specifically, a cylindrical battery according to one embodiment of the present invention may include: a cylindrical battery housing having one side open and a bottom portion on the other side; an electrode assembly accommodated in the battery housing and having a first electrode tab and a second electrode tab; an electrode terminal fixed to the bottom portion of the battery housing through a through hole formed in the bottom portion of the battery housing; and a cap plate covering and closing the open end of one side of the battery housing.

[0029] In addition, a cylindrical battery according to another embodiment of the present invention may include: a cylindrical battery housing having one side open and a bottom portion on the other side; an electrode terminal fixed to the bottom portion of the battery housing through a through hole formed in the bottom portion of the battery housing; an electrode assembly having a first electrode tab and a second electrode tab, and accommodated in the battery housing such that the first electrode tab faces the bottom portion of the battery housing and the electrode terminal through the open side of the battery housing; and a cap plate covering and closing the open end of one side of the battery housing while the electrode assembly is accommodated in the battery housing.

[0030] The above cap plate may not be electrically connected to the first electrode tab and the second electrode tab.

[0031] The first electrode tab is electrically connected to the electrode terminal, and the second electrode tab can be electrically connected to the battery housing.

[0032] Here, the side walls and bottom of the battery housing can be manufactured as a single part.

[0033] For example, the above side wall and bottom portion can be formed integrally through drawing processing of a sheet metal press, etc.

[0034] The first electrode tab faces the bottom portion, and the first electrode tab can be electrically connected to the electrode terminal.

[0035] An insulator may be interposed between the first electrode tab and the bottom portion.

[0036] The above insulator may not be interposed between the portion of the electrode terminal accommodated inside the battery housing and the first electrode tab.

[0037] The above insulator has a through hole, and the inner surface of the through hole can surround the circumference of the electrode terminal.

[0038] The portion of the electrode terminals accommodated inside the battery housing may face the insulator in the radial direction and not face the insulator in the axial direction.

[0039] The outer diameter of the electrode terminal exposed to the outside of the bottom portion may be larger than the inner diameter of the through hole in the bottom portion of the battery housing.

[0040] The cross-section of the through hole in the bottom portion of the battery housing may be included within the cross-section of the electrode terminal exposed to the outside of the bottom portion.

[0041] The portion of the electrode terminal exposed to the outside of the bottom portion can axially cover at least a part of the bottom portion of the battery housing.

[0042] The electrode terminal may include a terminal exposure portion extending to the outside of the battery housing; and a terminal insertion portion penetrating the upper surface of the battery housing.

[0043] The above cylindrical battery may further include an insulating gasket interposed between the through hole of the battery housing and the electrode terminal to insulate the electrode terminal and the battery housing.

[0044] The insulating gasket may include a gasket exposure portion extending to the outside of the battery housing; and a gasket insertion portion penetrating the bottom portion of the battery housing.

[0045] The above electrode terminal can be riveted onto the inner surface of the bottom portion of the battery housing.

[0046] The above cylindrical battery may further include a first current collection plate, one side of which is coupled to the first electrode tab and the other side of which is coupled to the electrode terminal.

[0047] The above cylindrical battery may further include an insulator interposed between the first current collector plate and the battery housing.

[0048] The above electrode terminal can penetrate the insulator and be coupled to the first current collector plate.

[0049] At least one of the first electrode tab and the second electrode tab can be bent toward the winding center of the electrode assembly.

[0050] The above cap plate may be provided with a venting portion configured to rupture and release gas when the internal pressure of the battery housing increases above a certain level.

[0051] A battery pack according to one embodiment of the present invention includes a plurality of batteries according to one embodiment of the present invention and a pack housing that accommodates the batteries.

[0052] An automobile according to one embodiment of the present invention includes a battery pack according to one embodiment of the present invention.

[0053] A method for manufacturing a battery according to the present invention for achieving the above technical problem may include: (a) preparing a battery housing having a bottom portion having one side open and a through hole provided on the other side; (b) fixing an electrode terminal in the through hole; (c) preparing an electrode assembly having a first electrode tab formed by a first blank portion and a second electrode tab formed by a second blank portion, respectively, on the upper and lower sides; (d) inserting the electrode assembly into the battery housing through an open end provided on one side of the battery housing such that the first electrode tab faces the bottom portion; (e) electrically connecting the first electrode tab and the electrode terminal; and (f) covering the open end with a cap plate to finish it.

[0054] The electrode terminal may include a terminal insertion portion inserted into the interior of the battery housing through the through hole. Additionally, step (b) may include: (b1) a step of interposing an insulating gasket between the electrode terminal and the through hole; and (b2) a step of plastically deforming the end edge of the terminal insertion portion in a radial direction to increase the diameter of the end edge to be greater than the diameter of the through hole.

[0055] In step (b2) above, the end edge can be pressed along the axial direction of the electrode assembly using a jig having a structure corresponding to the final shape of the plastic processing.

[0056] In step (b2) above, the plastically processed end edge can press the insulating gasket toward the inner surface of the bottom of the battery housing.

[0057] The above step (c) may include: preparing a first electrode having a first blank portion at the long end and a second electrode having a second blank portion at the long end; forming a plurality of cutting grooves in the first blank portion and the second blank portion along the winding direction of the electrode assembly to divide the first blank portion and the second blank portion into a plurality of sections; arranging the first electrode and the second electrode so that the first blank portion and the second blank portion face each other in the axial direction, and forming an electrode assembly with a defined core and outer surface by interposing a separator between the first electrode and the second electrode and winding around the axis; and forming a folded surface area having a structure in which the blank portion is stacked in a plurality of layers along the axial direction by folding the first blank portion and the second blank portion along the radial direction of the electrode assembly.

[0058] The above step (c) includes the step of attaching a first current collection plate to the surface area where the first non-removable portion is bent, and the above step (e) may be the step of electrically connecting the electrode terminal and the first electrode tab by attaching the electrode terminal and the first current collection plate.

[0059] The above step (e) may be a step of welding the electrode terminal and the first current collector plate using a hollow portion in the core of the electrode assembly.

[0060] The above step (e) may be a step of irradiating a welding laser toward a welding area of ​​the first current collector plate facing the electrode terminal through a hollow portion in the core of the electrode assembly.

[0061] The method for manufacturing a battery according to the present invention may further include the step of interposing an insulator between the first current collection plate and the inner surface of the bottom portion of the battery housing.

[0062] The method for manufacturing a battery according to the present invention may further include, prior to step (d), a step of preparing an insulator having a shape corresponding to the inner surface of the bottom portion of the battery housing and having a through hole in the center; and a step of installing the insulator on the inner surface of the bottom portion of the battery housing such that the through hole of the insulator surrounds the fixed portion of the electrode terminal.

[0063] The method for manufacturing a battery according to the present invention may further include, prior to step (d), a step of preparing an insulator having a shape corresponding to the inner surface of the bottom portion of the battery housing and having a through hole in the center; and a step of fixing the insulator on the first current collection plate such that the through hole of the insulator is located on the core of the electrode assembly.

[0064] A method for manufacturing a battery according to the present invention may further include the step of coupling a second current collector plate to a second electrode tab of the electrode assembly; and the step of coupling at least a portion of the second current collector plate to an inner surface of the battery housing.

[0065] The method for manufacturing a battery according to the present invention may further include the steps of: forming a beading portion by pressing the outer surface of an open end of the battery housing toward the inside of the battery housing; welding at least a portion of the second current collector plate to the second electrode tab; and bringing a predetermined portion of the edge of the second current collector plate into contact with the inner surface of the beading portion.

[0066] The method for manufacturing a battery according to the present invention may further include the step of bending the edge region of the second current collector plate adjacent to the predetermined region so that the predetermined region can reach the inner surface of the beading portion.

[0067] The method for manufacturing a battery according to the present invention may further include the step of welding the predetermined area to the inner surface of the beading portion.

[0068] A method for manufacturing a battery according to the present invention may further include the step of interposing a sealing gasket between the edge of the cap plate and the open end of the battery housing; and the step of forming a crimping portion by bending the open end of the battery housing in a centripetal direction to fix the edge of the cap plate to the open end together with the sealing gasket.

[0069] The above crimping portion can press the sealing gasket to press the predetermined area against the inner surface of the beading portion.

[0070] The method for manufacturing a battery according to the present invention may further include the step of forming a venting groove on at least one side of the two sides of the cap plate.

[0071] The method for manufacturing a battery according to the present invention may further include, prior to step (f), the step of setting up the battery housing so that the bottom portion of the battery housing faces the ground; and the step of injecting an electrolyte into the interior of the battery housing.

[0072] The method for manufacturing a battery according to the present invention may further include, after step (f), the step of setting up the battery housing so that the bottom portion of the battery housing faces upward; and the step of performing electrical wiring using the electrode terminal and the area excluding the area where the electrode terminal is exposed among the outer surfaces of the bottom portion of the battery housing. Effects of the invention

[0073] According to one aspect of the present invention, a cylindrical battery having a structure in which a positive terminal and a negative terminal are applied in the same direction is provided, and accordingly, the electrical connection structure of a plurality of cylindrical batteries can be simplified.

[0074] According to another aspect of the present invention, the electrode terminal of a cylindrical battery has a sufficient surface area to be welded to an electrical connection component, such as a busbar, thereby sufficiently securing the bonding strength between the electrode terminal and the electrical connection component and lowering the resistance at the bonding portion between the electrical connection component and the electrode terminal to a desirable level.

[0075] According to another aspect of the present invention, the electrode terminal and the electrode assembly can be closely positioned inside the battery housing, thereby increasing the energy storage capacity per volume, i.e., the energy density.

[0076] According to another aspect of the present invention, both the positive and negative terminals are exposed on one side of the cylindrical battery, whereas no terminals are exposed on the surface of the other side, which is highly advantageous from the perspective of insulation design.

[0077] According to another aspect of the present invention, since both a positive terminal and a negative terminal are provided on the bottom side of a battery housing that can be manufactured before inserting an electrode assembly, a sealing and insulation structure can be easily manufactured, and the battery capacity density relative to volume can be increased by closely accommodating the electrode assembly on the bottom side, and the manufacturing and assembly error of the positive terminal and the negative terminal can be minimized, thereby facilitating a subsequent process of connecting the batteries produced in this way to a busbar, etc.

[0078] According to another aspect of the present invention, regardless of whether the electrode assembly is inserted, the outer surface of the positive electrode can be structured to extend further outwardly than the inner surface of the negative electrode penetration hole at the bottom side of the battery housing manufactured first, thereby enabling arbitrary design of the exposed areas of the positive and negative terminals.

[0079] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing

[0080] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a drawing showing the external appearance of a cylindrical battery according to one embodiment of the present invention. FIG. 2 is a cross-sectional view showing the internal structure of a cylindrical battery according to one embodiment of the present invention. FIGS. 3 and FIGS. 4 are partial cross-sectional views showing the upper structure of a cylindrical battery according to one embodiment of the present invention. FIGS. 5 and 6 are drawings showing the combined structure of a first current collector plate and an electrode assembly applied to the present invention. FIG. 7 is a partial cross-sectional view showing the lower structure of a cylindrical battery according to one embodiment of the present invention. FIG. 8 is a drawing showing the lower surface of a cylindrical battery according to one embodiment of the present invention. FIG. 9 is a drawing showing a second current collector plate applied to the present invention. FIG. 10 is a schematic diagram showing a battery pack according to one embodiment of the present invention. FIG. 11 is a schematic diagram showing an automobile according to one embodiment of the present invention. Specific details for implementing the invention

[0081] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0082] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0083] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0084] In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0085] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0086] Singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0087] Additionally, singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may not be included, or that additional components or steps may be included.

[0088] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less unless specifically stated otherwise.

[0089] For convenience of explanation, in this specification, the direction following the longitudinal direction of the winding axis of an electrode assembly wound in a jelly roll shape is referred to as the axial direction (Z). The direction surrounding the winding axis is referred to as the circumferential direction or periphery direction. The direction approaching or moving away from the winding axis is referred to as the radial direction or radial direction (X, Y). In particular, the direction approaching the winding axis is referred to as the centripetal direction, and the direction moving away from the winding axis is referred to as the centrifugal direction.

[0090] Then, the axial direction (Z) can correspond to the width direction of the electrode before winding. The circumferential direction can correspond to the length direction of the electrode before winding. And the radial direction (X, Y) can correspond to the normal direction of the electrode before winding.

[0091] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0093] Referring to FIGS. 1 to 4, a cylindrical battery (1) according to an embodiment of the present invention has both electrode terminals provided on the bottom portion of a cylindrical battery housing (20), which has one side (lower part in the drawing) open and the other side (upper part in the drawing) provided with a bottom portion.

[0094] The bottom portion of the battery housing (20) may be processed first before inserting the electrode assembly (10) accommodated in the battery housing (20). The bottom portion of the battery housing (20) may be formed integrally with the side wall by drawing a metal sheet with a press or the like. The bottom portion may be formed to have a flat profile.

[0095] A through hole may be provided in the bottom portion (upper part in the drawing) of the battery housing (20). The through hole may be located approximately in the center of the bottom portion. The center of the bottom portion and the center of the through hole may be concentric. An electrode terminal (40) may be inserted and fixed in the through hole.

[0096] The electrode terminal (40) has a terminal exposure portion (41) exposed to the outside of the bottom portion and a terminal insertion portion (42) connected to the terminal exposure portion (41) and inserted into the interior of the battery housing (20) through the through hole.

[0097] An insulating gasket (50) is interposed between the electrode terminal (40) and the member forming the bottom portion of the battery housing (20). Accordingly, the gap between the electrode terminal (40) and the battery housing (20) is sealed, and the electrode terminal (40) and the battery housing (20) are electrically insulated.

[0098] The bottom portion of the battery housing (20) itself can be a first electrode terminal having one polarity. And the electrode terminal (40) can be a second electrode terminal having a different polarity.

[0099] The electrode terminal (40) can be exposed to the outside by penetrating the bottom portion of the battery housing (20). By forming a through hole in the bottom portion and fixing the electrode terminal (40) therein, both electrode terminals can be provided in the bottom portion of the battery housing (20).

[0100] The two electrode terminals to be provided on the bottom portion can be processed before the electrode assembly (10) is accommodated inside the battery housing (20), thus having the advantage of a high degree of processing freedom. That is, both electrode terminals can have surfaces that are advantageous and convenient for connecting external electrical connection components.

[0101] The bottom portion of the battery housing (20) can be processed to be flat through a simple process, and if the bottom portion is configured as a first electrode terminal, the connection work with an electrical connection component for connecting thereto can be made easier.

[0102] Since the electrode terminal (40) can also be processed before the electrode assembly (10) is inserted, the electrode terminal (40) can be processed flat with a simple process, and the connection work with the electrical connection component to be connected thereto can be made easier.

[0103] The terminal exposure portion (41) of the electrode terminal (40) may have a flange shape that extends radially further outward than the inner circumference of the through hole. The terminal exposure portion (41) may be processed first when preparing the electrode terminal (40) component. Therefore, the dimensions and shape of the terminal exposure portion (41) of the electrode terminal (40) can be determined simply yet precisely.

[0104] In this way, when mass-producing the cylindrical battery (1), the bottom part of the battery housing (20) and the electrode terminal (40) installed thereon are both pre-processed and assembled before the electrode assembly (10) is received in the battery housing (20), so the variation between mass-produced products in the area of ​​the two electrode terminals provided in the bottom part of the battery housing (20) can be simply minimized.

[0105] The present invention allows an electrode assembly (10) to be inserted into the battery housing (20) while two electrode terminals are already provided in the bottom portion of the battery housing (20). Accordingly, the electrode assembly (10) can be accommodated so as to be as close as possible to or in close contact with the bottom portion of the battery housing (20). The present invention simplifies the electrical connection structure between the electrode assembly (10) and the two electrode terminals in the bottom portion of the battery housing (20) where the two electrode terminals are provided. This structure results in a structure that further increases the energy density inside the battery housing (20).

[0106] The electrode assembly (10) may have a first electrode tab (11) at one end in the axial direction and a second electrode tab (12) at the other end.

[0107] The first electrode tab (11) is positioned so as to face the bottom portion of the battery housing (20), and the electrode assembly (10) can be inserted into the battery housing (20).

[0108] The first electrode tab (11) can be electrically connected to the terminal insertion part (42) of the electrode terminal (40). Accordingly, the electrode terminal (40) can have a first polarity.

[0109] The first electrode tab (11) is connected to the electrode terminal (40) and the first current collector plate (60).

[0110] The second electrode tab (12) may face the open end of the battery housing (20). The second electrode tab (12) may be electrically connected to the battery housing (20) through the inner surface of the battery housing (20). Accordingly, the bottom portion of the battery housing (20) surrounding the electrode terminal (40) may have a second polarity.

[0111] In the battery (1) of the present invention, since both electrode terminals are provided at the bottom of the cylindrical battery housing (20), the structure for closing the open end of the cylindrical battery housing (20) can be simplified as shown in FIG. 7.

[0112] This finishing can be achieved by a cap plate (30), which has the advantage of not having polarity.

[0113] To summarize, the cylindrical battery (1) of the embodiment may include: a cylindrical battery housing (20) having one side open and the other side having a bottom portion; an electrode assembly (10) accommodated in the battery housing (20) and having a first electrode tab (11) and a second electrode tab (12); an electrode terminal (40) fixed to the bottom portion of the battery housing (20) through a through hole formed in the bottom portion of the battery housing (20); and a cap plate (30) covering and closing the open end of one side of the battery housing (20).

[0114] In other words, the cylindrical battery (1) of the embodiment may include: a cylindrical battery housing (20) having one side open and a bottom portion on the other side; an electrode terminal (40) fixed to the bottom portion of the battery housing (20) through a through hole formed in the bottom portion of the battery housing (20); an electrode assembly (10) having a first electrode tab (11) and a second electrode tab (12), and accommodated in the battery housing (20) such that the first electrode tab (11) faces the bottom portion of the battery housing (20) and the electrode terminal (40) through the open side of the battery housing (20); and a cap plate (30) covering and closing the open end of one side of the battery housing (20) while the electrode assembly (10) is accommodated in the battery housing (20).

[0115] Here, the side walls and bottom portions of the battery housing (20) may be processed into a single part before accommodating the electrode assembly (10). It is sufficient for the side walls and bottom portions of the battery housing (20) to be made into a single part before accommodating the electrode assembly (10). That is, this concept may include not only manufacturing them into a single part from the beginning through forming processes such as drawing with a sheet metal press, but also manufacturing the side walls and bottom portions as separate parts, which are then assembled and integrated before accommodating the electrode assembly (10) to form a single part. The part forming the side wall and the part forming the bottom portion may be joined through welding.

[0116] The first electrode tab (11) may be electrically connected to the electrode terminal (40), and the second electrode tab (12) may be electrically connected to the battery housing (20). On the other hand, the cap plate (30) may not be electrically connected to the first electrode tab (11) and the second electrode tab (12). Of course, the technical concept of the present invention does not exclude the cap plate (30) being electrically connected to the second electrode tab (12). That is, the cap plate (30) may or may not have polarity. However, since both electrode terminals are provided at the bottom of the battery housing (20), the present invention implies that it is acceptable for the cap plate (30), which closes the open end on the opposite side, not to have polarity. Of course, there will be various advantages to be enjoyed by the cap plate (30) not having polarity.

[0117] The first electrode tab (11) faces the bottom portion, and the first electrode tab (11) can be electrically connected to the electrode terminal (40).

[0118] An insulator (70) may be interposed between the first electrode tab (11) and the bottom portion. Accordingly, the bottom portion of the battery housing (20) may be electrically insulated from the first electrode tab (11).

[0119] The above insulator (70) can be interposed so as to be in close contact between the bottom portion of the battery housing (20) and the first electrode tab (11). Accordingly, the degree of contact between the first current collector plate (60), which will be described later, and the first electrode tab (11) can be further increased.

[0120] The first current collector plate (60) is a component that electrically connects the first electrode tab (11) of the electrode assembly (10) and the electrode terminal (40). Referring to FIGS. 3 and 4, one side of the central portion of the first current collector plate (60) is in close contact or bonded with the electrode terminal (40), and the other side of the first current collector plate (60) is in close contact or bonded with the first electrode tab (11). The bonding can be achieved through welding. Therefore, the resistance of the current passing through the electrode terminal (40) can be minimized. In addition, this close-contact arrangement structure increases the utilization of the internal space of the battery housing (20), thereby increasing energy density.

[0121] The above insulator (70) may not be interposed between the portion of the electrode terminal (40) received inside the battery housing (20) and the first electrode tab (11).

[0122] The insulator (70) has a hole that penetrates vertically, and the inner surface of the hole can surround the fixed part of the electrode terminal (40).

[0123] The portion of the electrode terminal (40) that is housed inside the battery housing (20) may face the insulator (70) in the radial direction and may not face the insulator (70) in the axial direction.

[0124] The outer diameter of the electrode terminal (40) exposed to the outside of the bottom portion may be larger than the inner diameter of the through hole in the bottom portion of the battery housing (20). In other words, the first cross-section of the through hole in the bottom portion of the battery housing (20) may be contained within the second cross-section of the electrode terminal (40) exposed to the outside of the bottom portion. The first cross-section and the second cross-section are cross-sections perpendicular to the axial direction. Being contained within the first cross-section means that when the first cross-section is projected onto the second cross-section, the projected area of ​​the first cross-section is contained within the second cross-section. Accordingly, the portion of the electrode terminal (40) exposed to the outside of the bottom portion can cover at least a portion of the bottom portion of the battery housing (20) in the radial direction. By doing so, both the surface area of ​​the bottom portion and the surface area of ​​the electrode terminal (40) can be appropriately secured.

[0125] The above cylindrical battery (1) can be manufactured as follows.

[0126] First, a cylindrical battery housing (20) is prepared having a bottom portion that is open on one side and has a through hole on the other side. Then, an electrode terminal (40) is fixed in the through hole. When fixing the electrode terminal (40) in the through hole, the insulating gasket (50) can be closely interposed between the electrode terminal (40) and the through hole formed in the bottom portion of the battery housing (20).

[0127] Next, an electrode assembly (10) is prepared having a first electrode tab (11) and a second electrode tab (12) at each end.

[0128] Before inserting the electrode assembly (10) into the battery housing (20), a first current collector plate (60) can first be laminated axially on the first electrode tab (11). The first electrode tab (11) can be bent radially as shown in FIG. 6, and the first current collector plate (60) can be joined to the bent first electrode tab (11) by means such as welding. To facilitate the bending of the first electrode tab (11), cutting grooves can be formed at regular intervals along the winding direction in the unbundled portion forming the first electrode tab (11). The extension direction of the cutting grooves may be the axial direction of the electrode assembly (10). Of course, as shown in FIG. 5, it is also possible to laminate the first current collector plate (60) without bending the first electrode tab (11).

[0129] Next, the electrode assembly (10) is inserted through an open end provided at the axial end of the battery housing (20) in which the electrode terminal (40) is fixed to the bottom portion. At this time, the electrode assembly (10) is inserted such that the first electrode tab (11) of the electrode assembly (10) faces the bottom portion. At this time, an insulator (70) may be interposed between the first electrode tab (11), the first current collector plate (60), and the inner surface of the bottom portion of the battery housing (20).

[0130] The insulator (70) may be installed first on the inner side of the bottom portion of the battery housing (20) before inserting the electrode assembly (10). Alternatively, the insulator (70) may be attached to the end of the electrode assembly (10) to which the first current collector plate (60) is attached. An adhesive or adhesive tape may be used for attaching the insulator (70). If the insulator (70) is made of a heat-shrinkable polymer resin, heat may be applied to fix the insulator (70) to the end of the electrode assembly (10). The insulator (70) may include a sleeve structure that extends axially along the outer surface of the electrode assembly (10) to cover the upper outer surface of the electrode assembly (10).

[0131] After inserting the electrode assembly (10) into the battery housing (20), the first electrode tab (11) and the electrode terminal (40) are electrically connected, and the second electrode tab (12) and the battery housing (20) are electrically connected.

[0132] The electrode terminal (40) can be aligned with a hollow portion provided at the winding center (C) of the electrode assembly (10). Accordingly, a welding device can be inserted through the open end of the battery housing (20) and the hollow portion of the electrode assembly (10) to join the terminal insertion portion (42) of the electrode terminal (40) and the central portion of the first current collection plate (60). Since the lower end of the terminal insertion portion (42) of the electrode terminal (40) is flat, it can be welded in a state of close contact with the central portion of the first current collection plate (60). When the first current collection plate is laser welded to the terminal insertion portion (42) of the electrode terminal (40), a laser beam can be irradiated through the hollow portion of the electrode assembly (10). In this case, it is not necessary to insert a welding device into the hollow portion.

[0133] A second current collector plate (80) may be attached to the second electrode tab (12), and the edge of the second current collector plate (80) may be connected to the inner surface of the battery housing (20). As shown in FIGS. 5 and 6, the second current collector plate (80) may be attached to the second electrode tab (12) with the second electrode tab (12) bent radially or without bending. To facilitate the bending of the second electrode tab (12), cutting grooves may be formed at regular intervals along the winding direction in the unbundled portion forming the second electrode tab (12). The extension direction of the cutting grooves may be the axial direction of the electrode assembly (10).

[0134] As illustrated in FIGS. 5, 6 and 9, a hole may be provided in the central portion of the second current collection plate (80). This hole may serve as a passage through which a device for joining the first current collection plate (60) and the electrode terminal (40) can be inserted or through which a laser beam can pass. That is, the second current collection plate (80) may be joined to the second electrode tab (12) first before the electrode assembly (10) is inserted into the battery housing (20). Of course, the second current collection plate (80) may also be joined to the second electrode tab (2) after the electrode assembly (10) is inserted into the battery housing (20).

[0135] Next, the open end of the battery housing (20) can be covered and finished with a cap plate (30). At this time, a sealing gasket (90) is interposed between the open end of the battery housing (20) and the edge of the cap plate (30), and the cap plate (30) is pressed together with the sealing gasket (90) into the crimping portion (22) of the battery housing (20), thereby insulating the cap plate (30) from the battery housing (20).

[0136] The electrode assembly (10) is inserted into the battery housing (20), and before forming the crimping portion (22), a beading portion (21) is formed to support the lower edge of the electrode assembly (10) so that the electrode assembly (10) inserted into the battery housing (20) does not come out again.

[0137] The edge of the second current collector plate (80) can be made to interlock with the beading portion (21). In particular, if a crimping portion (22) is formed with the edge of the second current collector plate (80) interposed between the beading portion (21) and the cap plate (30), the second current collector plate (80) can be in close contact with the battery housing (20). Of course, the non-polarity of the cap plate (30) can be maintained by interposing the sealing gasket (90) between the cap plate (30) and the edge of the second current collector plate (80). In this case, the edge of the second current collector plate (80) can be fixed by interposing it between the sealing gasket (90) and the inner surface of the beading portion (21).

[0138] Before covering the open end of the battery housing (20) with a cap plate (30), at least a portion of the edge of the second current collector plate (80) may be welded to the inner circumference of the beading portion (21). The welded surface of the beading portion (21) may be the lower surface based on the innermost point of the beading portion (21).

[0139] Referring to FIGS. 1 to 3, a cylindrical battery (1) according to one embodiment of the present invention comprises an electrode assembly (10), a battery housing (20), a cap plate (30), and an electrode terminal (40). In addition to the components described above, the cylindrical battery (1) may further include an insulating gasket (50) and / or a first current collector plate (60) and / or an insulator (70) and / or a second current collector plate (80) and / or a sealing gasket (90).

[0140] The electrode assembly (10) comprises a first electrode having a first polarity, a second electrode having a second polarity, and a separator interposed between the first electrode and the second electrode. The first electrode is a positive or negative electrode, and the second electrode corresponds to an electrode having a polarity opposite to that of the first electrode.

[0141] The electrode assembly (10) may have, for example, a jelly-roll shape.

[0142] That is, the electrode assembly (10) can be manufactured by winding a laminate formed by sequentially stacking a first separator, a first electrode, a second separator, and a second electrode at least once, based on a winding center (C). The electrode assembly (10) may have a jelly roll structure. On the outer surface of the electrode assembly (10), the outermost winding turn of the separator may be provided to insulate from the battery housing (20).

[0143] The first electrode comprises a first electrode current collector and a first electrode active material applied on one or both sides of the first electrode current collector. A first blank area, where the first electrode active material is not applied, exists at one end of the first electrode current collector in the width direction (a direction parallel to the Z-axis). The first blank area extends along the winding direction of the electrode assembly (10).

[0144] The first blank portion above functions as a first electrode tab (11). The first electrode tab (11) is provided on the upper side in the height direction (a direction parallel to the Z-axis) of the electrode assembly (10) housed within the battery housing (20).

[0145] The second electrode comprises a second electrode current collector and a second electrode active material applied on one or both sides of the second electrode current collector. At the other end of the second electrode current collector in the width direction (a direction parallel to the Z-axis), there exists a second blank area where the second electrode active material is not applied. The second blank area extends along the winding direction of the electrode assembly (10).

[0146] The above-mentioned second blank portion functions as a second electrode tab (12). The second electrode tab (12) is provided in the lower height direction (a direction parallel to the Z-axis) of the electrode assembly (10) housed within the battery housing (20).

[0147] The first electrode tab (11) and the second electrode tab (12) extend outward from the separator in opposite directions along the axial direction of the electrode assembly (10). Accordingly, the first blank portion of the first electrode and the second blank portion of the second electrode exposed to the outside on one side and the other side of the electrode assembly (10) can be used as electrode tabs themselves.

[0148] The first electrode tab (11) and the second electrode tab (12) have a structure wound in a spiral shape. A plurality of cutting grooves may be formed at regular intervals along the winding direction of the electrode assembly (10) in the first blank section and the second blank section. The plurality of cutting grooves facilitate the bending process of the blank section by dividing the first blank section and the second blank section into a plurality of sections.

[0149] In the present invention, the positive active material coated on the positive plate and the negative active material coated on the negative plate may be used without limitation as long as they are active materials known in the art.

[0150] In one example, the positive active material is the general chemical formula A[A x M y ]O 2+z It may include an alkali metal compound represented by (A contains at least one element among Li, Na and K; M contains at least one element selected from Ni, Co, Mn, Ca, Mg, Al, Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; 0≤x, 1≤x+y≤2, 0.1≤z≤2; the stoichiometric coefficients of the components included in x, y, z and M are selected so that the compound maintains electrical neutrality).

[0151] In another example, the positive active material is an alkali metal compound xLiM disclosed in US6,677,082, US6,680,143, etc. 1 O2-(1-x)Li2M 2 O3(M 1 ... comprises at least one element having an average oxidation state of 3; M 2 It contains at least one element having an average oxidation state of 4; 0≤x≤1).

[0152] In another example, the positive active material is, with the general chemical formula Li a M 1 x Fe 1-x M 2 y P 1-y M 3 z O 4-z (M 1 Silver comprises at least one element selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, and Al; M 2 ... comprises at least one element selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, As, Sb, Si, Ge, V, and S; M 3 ... comprises a halogen element optionally containing F; 0 < a ≤ 2, 0 ≤ x ≤ 1, 0 ≤ y < 1, 0 ≤ z < 1; a, x, y, z, M 1 , M 2 , and M 3 The stoichiometric coefficient of the component included in the compound is selected so that the compound remains electrically neutral), or may be a lithium metal phosphate represented as Li3M2(PO4)3 [M comprises at least one element selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg and Al].

[0153] Preferably, the positive active material may include primary particles and / or secondary particles formed by the aggregation of primary particles.

[0154] In one example, the negative electrode active material may be a carbon material, lithium metal or lithium metal compound, silicon or silicon compound, tin or tin compound, etc. Metal oxides such as TiO2 and SnO2 with a potential of less than 2V may also be used as negative electrode active materials. As for the carbon material, low-crystallinity carbon, high-crystallinity carbon, etc. may all be used.

[0155] The separator may be a porous polymer film, such as a polyolefin-based polymer like ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer, ethylene / methacrylate copolymer, etc., used alone or in a laminate thereof. As another example, the separator may be a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fibers, polyethylene terephthalate fibers, etc.

[0156] At least one surface of the separation membrane may include a coating layer of inorganic particles. It is also possible for the separation membrane itself to consist of a coating layer of inorganic particles. The particles constituting the coating layer may have a structure bonded with a binder such that interstitial volume exists between adjacent particles.

[0157] The inorganic particles may be composed of inorganic materials having a dielectric constant of 5 or higher. As a non-limiting example, the inorganic particles are Pb(Zr,Ti)O3(PZT), Pb 1-x La x Zr 1-y Ti y O3(PLZT), PB(Mg3Nb 2 / 3 It may include at least one material selected from the group consisting of O3PbTiO3(PMN-PT), BaTiO3, hafnia(HfO2), SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO, and Y2O3.

[0158] The electrolyte is A + B - It may be a salt having a structure like that. Here, A + is Li + , Na + , K + It includes alkali metal cations such as or ions composed of combinations thereof. And B - is F - , Cl - , Br - , I - , NO3 - , N(CN)2 - , BF4 - , ClO4 - , AlO4 - , AlCl4 - , PF6 - , SbF6 - , AsF6 - , BF2C2O4 - , BC4O8 - , (CF3)2PF4 - , (CF3)3PF3 - , (CF3)4PF2 - , (CF3)5PF - , (CF3)6P - , CF3SO3 - , C4F9SO3 - , CF3CF2SO3 - , (CF3SO2)2N - , (FSO2)2N - , CF3CF2(CF3)2CO - , (CF3SO2)2CH - , (SF5)3C - , (CF3SO2)3C - , CF3(CF2)7SO3 - , CF3CO2 - , CH3CO2 - ,SCN - and (CF3CF2SO2)2N - It includes one or more anions selected from the group consisting of

[0159] The electrolyte can also be used by dissolving it in an organic solvent. As an organic solvent, propylene carbonate (propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), gamma-butyrolactone (γ-butyrolactone), or mixtures thereof may be used.

[0160] Referring to FIGS. 1 to 4, the battery housing (20) is a roughly cylindrical receptacle with an open end formed at the bottom and is made of a conductive material, such as metal. The material of the battery housing (20) may be, for example, steel, stainless steel, aluminum, etc.

[0161] The side (outer surface) and the top surface of the battery housing (20) may be formed integrally. The top surface (a surface parallel to the XY plane) of the battery housing (20) has a roughly flat shape. The bottom portion of the battery housing (20) located opposite the open end forms a closed end. The battery housing (20) accommodates an electrode assembly (10) through the open end formed at the bottom, and also accommodates an electrolyte. The closed end supports the electrode assembly inserted through the open end.

[0162] The battery housing (20) is electrically connected to the electrode assembly (10). The battery housing (20) is electrically connected, for example, to the second electrode tab (12) of the electrode assembly (10). In this case, the battery housing (20) has the same polarity as the second electrode tab (12).

[0163] Referring to FIGS. 2 and 7, the battery housing (20) may have a beading portion (21) and a crimping portion (22) formed at its lower end. The beading portion (21) is located at the lower end of the electrode assembly (10). The beading portion (21) is formed by pressing the outer circumference of the battery housing (20). The beading portion (21) prevents the electrode assembly (10), which may have a size roughly corresponding to the internal space of the battery housing (20), from coming out through the open end formed at the lower end of the battery housing (20), and can function as a support portion on which the edges of the cap plate (30) and the second current collection plate (80) are seated.

[0164] The above-mentioned crimping portion (22) is formed at the lower part of the beading portion (21). The crimping portion (22) has a shape that is extended and bent to wrap around the outer surface of the cap plate (30) positioned below the beading portion (21) and a part of the lower surface of the cap plate (30).

[0165] However, the present invention does not exclude cases where the battery housing (20) does not have such a beading portion (21) and / or a crimping portion (22). In the present invention, where the battery housing (20) does not have a beading portion (21) and / or a crimping portion (22), the fixing of the electrode assembly (10) and / or the fixing of the cap plate (30) and / or the sealing of the battery housing (20) can be realized, for example, through the additional application of a part that can function as a stopper for the electrode assembly (10) and / or the additional application of a structure on which the cap plate (30) can be seated and / or welding between the battery housing (20) and the cap plate (30).

[0166] The area forming the bottom portion of the battery housing (20) may have a thickness in the range of approximately 0.5 mm to 1.0 mm, and more preferably may have a thickness in the range of approximately 0.6 mm to 0.8 mm. The side wall portion forming the outer surface of the battery housing (20) may have a thickness in the range of approximately 0.3 mm to 0.8 mm, and more preferably may have a thickness in the range of approximately 0.40 mm to 0.60 mm. According to one embodiment of the present invention, a plating layer may be formed on the battery housing (20). In this case, the plating layer may include, for example, nickel (Ni). The thickness of the plating layer may be in the range of approximately 1.5 μm to 6.0 μm.

[0167] As the thickness of the battery housing (20) becomes thinner, the internal space becomes larger, and thereby the energy density is improved, making it possible to manufacture a cylindrical battery (1) with a large capacity.

[0168] Conversely, the thicker the thickness, the less likely flames are to spread sequentially to adjacent batteries during explosion tests, which can be advantageous in terms of safety.

[0169] The thinner the plating layer, the more susceptible it is to corrosion, and the thicker it is, the more difficult the manufacturing process becomes or the higher the possibility of plating peeling. It is necessary to set the optimal thickness of the battery housing (20) and the optimal thickness of the plating layer by taking all these conditions into account. Furthermore, it is necessary to control the thickness of the bottom part and the thickness of the side wall of the battery housing (20) respectively by taking all these conditions into account.

[0170] Referring to FIGS. 2 and FIGS. 7, the cap plate (30) may be made of, for example, a metal material to ensure rigidity. The cap plate (30) covers an open end formed at the bottom of the battery housing (20). That is, the cap plate (30) forms the lower surface of the cylindrical battery (1). In the cylindrical battery (1) of the present invention, the cap plate (30) does not have polarity even if it is made of a conductive metal material. Not having polarity may mean that the cap plate (30) is electrically insulated from the battery housing (20) and the electrode terminal (40). Therefore, the cap plate (30) does not function as a positive terminal or a negative terminal. Accordingly, the cap plate (30) does not need to be electrically connected to the electrode assembly (10) and the battery housing (20), and its material does not necessarily have to be a conductive metal.

[0171] When the battery housing (20) of the present invention is provided with a beading portion (21), the cap plate (30) may be seated on the beading portion (21) formed in the battery housing (20). Additionally, when the battery housing (20) of the present invention is provided with a crimping portion (22), the cap plate (30) is fixed by the crimping portion (22). A sealing gasket (90) may be interposed between the cap plate (30) and the crimping portion (22) of the battery housing (20) to ensure airtightness of the battery housing (20).

[0172] Meanwhile, as previously explained, the battery housing (20) of the present invention may not have a beading portion (21) and / or a crimping portion (22), in which case the sealing gasket (90) may be interposed between a fixing structure provided on the open end side of the battery housing (20) and a cap plate (30) to ensure airtightness of the battery housing (20).

[0173] Referring to FIGS. 7 and 8, the cap plate (30) may further be provided with a venting portion (31) formed to prevent the internal pressure from increasing beyond a preset value due to gas generated inside the battery housing (20). The venting portion (31) corresponds to an area of ​​the cap plate (30) that has a thinner thickness compared to the surrounding area. The venting portion (31) is structurally weak compared to the surrounding area. Therefore, if an abnormality occurs in the cylindrical battery (1) and the internal pressure of the battery housing (20) increases above a certain level, the venting portion (31) breaks, and the gas generated inside the battery housing (20) is discharged. The venting portion (31) may be formed, for example, by notching on one or both sides of the cap plate (30) to partially reduce the thickness of the cap plate (30).

[0174] A cylindrical battery (1) according to one embodiment of the present invention has a structure in which both a positive terminal and a negative terminal exist at the top, and as a result, the structure of the top is more complex than the structure of the bottom. Accordingly, a venting portion (31) may be formed on a cap plate (30) forming the bottom surface of the cylindrical battery (1) to facilitate the smooth discharge of gas generated inside the battery housing (20). As shown in FIG. 7, it is preferable that the bottom portion of the cap plate (30) be located higher than the bottom portion of the battery housing (20). In this case, even if the bottom portion of the battery housing (20) touches the ground or the bottom surface of the housing for module or pack configuration, the cap plate (30) does not touch the ground or the bottom surface of the housing for module or pack configuration. Therefore, the phenomenon in which the pressure required for the rupture of the venting part (31) differs from the design value due to the weight of the cylindrical battery (1) can be prevented, and accordingly, the smooth rupture of the venting part (31) can be ensured.

[0175] Meanwhile, when the venting portion (31) has a closed-loop shape as shown in FIGS. 7 and 8, it is advantageous for the distance from the center of the cap plate (30) to the venting portion (31) to be greater in terms of ease of breaking. This is because, when the same venting pressure is applied, the greater the distance from the center of the cap plate (30) to the venting portion (31), the greater the force acting on the venting portion (31), making it easier to break. In addition, it is advantageous for the distance from the center of the cap plate (30) to the venting portion (31) to be greater in terms of smooth discharge of venting gas. From this perspective, it may be advantageous for the venting portion (31) to be formed along the edge of a roughly flat area protruding downward (in the downward direction based on FIG. 7) from the edge perimeter area of ​​the cap plate (30).

[0176] In FIG. 8 of the present invention, the venting portion (31) is shown as being formed continuously in a roughly circular shape on the cap plate (30), but the present invention is not limited thereto. The venting portion (31) may be formed discontinuously in a roughly circular shape on the cap plate (30), or may be formed in a roughly straight line shape or other shapes.

[0177] Referring to FIGS. 1 to 3, the electrode terminal (40) is made of a conductive metal material and passes through the upper surface of the battery housing (20), that is, the surface located opposite the open end of the battery housing (20) (a surface parallel to the XY plane). The electrode terminal (40) is electrically connected, for example, to the first electrode tab (11) of the electrode assembly (10). In this case, the electrode terminal (40) has a first polarity. Thus, the electrode terminal (40) can function as a first electrode terminal in the cylindrical battery (1) of the present invention. When the electrode terminal (40) has such a first polarity, the electrode terminal (40) is electrically insulated from the battery housing (20) having a second polarity. Electrical insulation between the electrode terminal (40) and the battery housing (20) can be realized in various ways. For example, insulation can be achieved by interposing an insulating gasket (50) between the electrode terminal (40) and the battery housing (20). Alternatively, insulation can be achieved by forming an insulating coating layer on a part of the electrode terminal (40). Or, a method of structurally and firmly fixing the electrode terminal (40) so that contact between the electrode terminal (40) and the battery housing (20) is impossible may be applied. Or, multiple methods among those described above may be applied together.

[0178] The electrode terminal (40) includes a terminal exposure portion (41) and a terminal insertion portion (42). The terminal exposure portion (41) is exposed to the outside of the battery housing (20). The terminal exposure portion (41) may be located approximately in the center of the upper surface of the battery housing (20). The maximum width of the terminal exposure portion (41) may be formed to be larger than the maximum width of the through hole formed in the battery housing (20). The terminal insertion portion (42) may penetrate approximately in the center of the upper surface of the battery housing (20) and be electrically connected to the first electrode tab (11). The end edge region of the terminal insertion portion (42) may be riveted to the inner surface of the battery housing (20) by bending it toward the inner surface through plastic deformation. Plastic deformation refers to a method of deforming the shape of the lower end of the electrode terminal (40) by applying pressure with a jig. Through plastic deformation, the end edge region of the terminal insertion part (42) is extended radially and its diameter increases. The jig has a structure corresponding to the final shape of the terminal insertion part (42). Plastic deformation is a metal processing technique that utilizes the ductility and malleability of the metal. Plastic deformation may be caulking. During plastic deformation, pressure using the jig may be applied multiple times. The portion of the terminal insertion part (42) that is bent toward the inner surface can provide airtightness between the electrode terminal (40) and the battery housing (20) by compressing the insulating gasket (50) toward the inner surface. Since the end edge region of the terminal insertion part (42) has a shape that is bent toward the inner surface of the battery housing (20), the maximum width of the end of the terminal insertion part (42) is greater than the maximum width of the through hole of the battery housing (20).

[0179] Meanwhile, when the cylindrical battery (1) of the present invention is equipped with a first current collection plate (60), the central region of the terminal insertion part (42) can be combined with the first current collection plate (60). The central region of the terminal insertion part (42) may, for example, have a roughly cylindrical shape. The diameter of the bottom surface of the central region of the terminal insertion part (42) may be set to approximately 6.2 mm.

[0180] The connection between the bottom surface of the central region of the terminal insertion part (42) and the first current collection plate (60) can be achieved, for example, by laser welding or ultrasonic welding.

[0181] The above laser welding can be performed by irradiating a laser through a hollow portion formed at the winding center (C) of the electrode assembly (10) to form a laser welding line on one surface of the first current collector plate (60). The laser welding line may be formed in a shape that forms a roughly concentric circle with the bottom surface of the terminal insertion portion (42) center area on one surface of the first current collector plate (60). The welding line may be formed continuously or partially discontinuously.

[0182] The above concentric welding line may have a diameter of approximately 60% to 80% of the diameter of the bottom surface of the center area of ​​the terminal insertion part (42). For example, when the diameter of the bottom surface of the center area of ​​the terminal insertion part (42) is approximately 6.2 mm, the diameter of the circle drawn by the welding line may preferably be approximately 4.0 mm or more. If the diameter of the circle drawn by the welding line is formed too small, the bonding strength by welding may be insufficient. Conversely, if the diameter of the circle drawn by the welding line is formed too large, the risk of damage to the electrode assembly (10) due to heat and / or welding spatter, etc. may increase.

[0183] The above ultrasonic welding can be performed by inserting a welding rod for ultrasonic welding through a hollow portion formed at the winding center (C) of the electrode assembly (10). The weld formed by the ultrasonic welding is formed within the contact interface between the bottom surface of the terminal insertion portion (42) center area and the first current collector plate (60). The weld formed by the ultrasonic welding can be formed entirely within a concentric circle having a diameter of approximately 30% to 80% relative to the bottom surface of the terminal insertion portion (42) center area. For example, when the diameter of the bottom surface of the terminal insertion portion (42) center area is approximately 6.2 mm, the diameter of the circle formed by the ultrasonic welding may preferably be approximately 2.0 mm or more. If the diameter of the circle formed by the ultrasonic welding is formed too small, the bonding strength by welding may be insufficient. Conversely, if the diameter of the circle formed by the above-mentioned ultrasonic welding is too large, there is a greater risk of damage to the electrode assembly (10) due to heat and / or vibration.

[0184] In one embodiment of the present invention, the upper surface of the battery housing (20) and the electrode terminal (40) exposed to the outside of the battery housing (20) have opposite polarities and face in the same direction. Additionally, a step may be formed between the electrode terminal (40) and the upper surface of the battery housing (20). Specifically, if the entire upper surface of the battery housing (20) has a flat shape or has a shape protruding upward from its center, the terminal exposure portion (41) of the electrode terminal (40) may protrude further upward than the upper surface of the battery housing (20). Conversely, if the upper surface of the battery housing (20) has a shape that is concavely indented downward from its center, that is, in the direction toward the electrode assembly (10), the upper surface of the battery housing (20) may protrude further upward than the terminal exposure portion (41) of the electrode terminal (40).

[0185] Meanwhile, in the case where the upper surface of the battery housing (20) has a shape that is concavely indented downward from its center, that is, in the direction toward the electrode assembly (10), the upper surface of the battery housing (20) and the upper surface of the terminal exposure portion (41) may substantially form the same plane depending on the depth of the indentation and the thickness of the terminal exposure portion (41) of the electrode terminal (40). In this case, a step may not be formed between the upper surface of the battery housing (20) and the terminal exposure portion (41).

[0186] The insulating gasket (50) is interposed between the battery housing (20) and the electrode terminal (40) to prevent the battery housing (20) and the electrode terminal (40), which have opposite polarities, from coming into contact with each other.

[0187] Thus, the upper surface (20a) of the battery housing (20) having a roughly flat shape can function as a second electrode terminal of the cylindrical battery (1).

[0188] The insulating gasket (50) includes a gasket exposure portion (51) and a gasket insertion portion (52).

[0189] The gasket exposure portion (51) is interposed between the terminal exposure portion (41) of the electrode terminal (40) and the battery housing (20). The gasket insertion portion (52) is interposed between the terminal insertion portion (42) of the electrode terminal (40) and the through hole of the battery housing (20). The gasket insertion portion (52) can be deformed together with the terminal insertion portion (42) during plastic processing and adhere to the inner surface of the battery housing (20). The insulating gasket (50) may be made of, for example, a resin material having insulating properties.

[0190] Referring to FIG. 4, the gasket exposure portion (51) of the insulating gasket (50) may have an extended shape to cover the outer surface of the terminal exposure portion (41) of the electrode terminal (40).

[0191] In this way, when the insulating gasket (50) covers the outer surface of the electrode terminal (40), it is possible to prevent a short circuit from occurring during the process of connecting electrical connection components, such as a bus bar, to the upper surface of the battery housing (20) and / or the electrode terminal (40). Although not shown in the drawing, the gasket exposure portion (51) of the insulating gasket (50) may have an extended shape to cover not only the outer surface of the terminal exposure portion (41) but also a part of the upper surface.

[0192] In the case where the insulating gasket (50) is made of a resin material, the insulating gasket (50) can be joined to the battery housing (20) and electrode terminal (40) by heat fusion.

[0193] In this case, airtightness at the bonding interface between the insulating gasket (50) and the electrode terminal (40) and at the bonding interface between the insulating gasket (50) and the battery housing (20) can be enhanced. Meanwhile, in the case where the gasket exposure portion (51) of the insulating gasket (50) has a shape that extends to the upper surface of the terminal exposure portion (41), the electrode terminal (40) may be bonded to the insulating gasket (50) by insert injection.

[0194] According to one embodiment of the present invention, the insulating gasket (50), the insulator (70), and the sealing gasket (90) may be formed of the same material. However, this is not essential. The thicknesses of the insulating gasket (50) and the insulator (70) may be the same. However, this is not essential. If their thicknesses are different, the insulator (70) may be thinner than the insulating gasket (50), and vice versa.

[0195] The entire remaining area of ​​the upper surface of the battery housing (20), excluding the area occupied by the electrode terminal (40) and the insulating gasket (50), corresponds to a second electrode terminal (20a) having opposite polarity to the electrode terminal (40). Alternatively, in the present invention, if the insulating gasket (50) is omitted and an insulating coating layer is partially provided on the electrode terminal (40), the entire remaining area of ​​the upper surface of the battery housing (20), excluding the area occupied by the electrode terminal (40) having the insulating coating layer, can function as a second electrode terminal (20a).

[0196] The cylindrical side wall of the battery housing (20) may be formed as one piece with the second electrode terminal (20a) so that there is no discontinuous portion between it and the second electrode terminal (20a). The connection from the side wall of the battery housing (20) to the second electrode terminal (20a) may be a smooth curve. However, the present invention is not limited thereto, and the connection portion may include at least one corner having a predetermined angle.

[0197] Referring to FIGS. 2 to 4, the first current collecting plate (60) is coupled to the upper part of the electrode assembly (10). The first current collecting plate (60) is made of a conductive metal material and is connected to the first electrode tab (11). Although not shown in the drawings, the first current collecting plate (60) may have a plurality of irregularities formed radially on its lower surface. When the irregularities are formed, the first current collecting plate (60) can be pressed to press the irregularities into the first electrode tab (11).

[0198] Referring to FIG. 5, the first current collector plate (60) is coupled to the end of the first electrode tab (11). The coupling between the first electrode tab (11) and the first current collector plate (60) can be achieved, for example, by laser welding. The laser welding may be performed by partially melting the base material of the first current collector plate (60), or by interposing solder for welding between the first current collector plate (60) and the first electrode tab (11). In this case, it is preferable that the solder has a lower melting point compared to the first current collector plate (60) and the first electrode tab (11).

[0199] Referring to FIG. 6, the first current collector plate (60) can be coupled to a coupling surface formed by bending the end of the first electrode tab (11) in a direction parallel to the first current collector plate (60). The bending direction of the first electrode tab (11) may, for example, be a direction toward the winding center (C) of the electrode assembly (10). When the first electrode tab (11) is bent, the uncoated portion forming the first electrode tab (11) may form a bent surface area. The bent surface area has a structure in which the uncoated portion is stacked in multiple layers along the axial direction of the electrode assembly (10). When the first electrode tab (11) has such a bent shape, the space occupied by the first electrode tab (11) is reduced, which can lead to an improvement in energy density. In addition, the increase in the coupling area between the first electrode tab (11) and the first current collector plate (60) can lead to an improvement in coupling strength and a reduction in resistance.

[0200] Referring to FIGS. 2 to 4, the insulator (70) is provided between the top of the electrode assembly (10) and the inner surface of the battery housing (20), or between the first current collecting plate (60) coupled to the top of the electrode assembly (10) and the inner surface of the battery housing (20). The insulator (70) prevents contact between the first electrode tab (11) and the battery housing (20) and / or contact between the first current collecting plate (60) and the battery housing (20). The insulator (70) may also be interposed between the top of the outer surface of the electrode assembly (10) and the inner surface of the battery housing (20). The first current collecting plate (60) may be a plate that extends completely across the top of the electrode assembly (10). However, the present invention is not limited thereto, and the first current collection plate (60) may be formed to extend only partially across the top of the electrode assembly (10).

[0201] In the case where a cylindrical battery (1) according to one embodiment of the present invention is equipped with an insulator (70), the terminal insertion portion (42) of the electrode terminal (40) penetrates (passes through) the insulator (70) and is coupled with the first current collection plate (60) or the first electrode tab (11).

[0202] The above insulator (70) may have a through hole adjacent to the winding center (C). The through hole allows the terminal insertion part (42) of the electrode terminal (40) to come into direct contact with the first current collection plate (60).

[0203] In one embodiment of the present invention, the terminal insertion part (42) may have a planar shape that is circular, but is not limited thereto. The terminal insertion part (42) may optionally have a polygonal shape, a star shape, a shape having legs extending from the center, etc.

[0204] Referring to FIGS. 2 and FIGS. 7, the second current collector plate (80) is coupled to the lower part of the electrode assembly (10). The second current collector plate (80) is made of a conductive metal material and is connected to the second electrode tab (12). Additionally, the second current collector plate (80) is electrically connected to the battery housing (20). As shown in FIG. 7, the second current collector plate (80) can be interposed and fixed between the inner surface of the battery housing (20) and the sealing gasket (90).

[0205] Alternatively, the second current collector plate (80) may be welded to the inner surface of the battery housing (20).

[0206] Although not shown in the drawing, the second current collector plate (80) may have a plurality of irregularities formed radially on one surface. When the irregularities are formed, the second current collector plate (80) can be pressed to press the irregularities into the second electrode tab (12).

[0207] Referring to FIG. 5, the second current collector plate (80) is coupled to the end of the second electrode tab (12). The coupling between the second electrode tab (12) and the second current collector plate (80) can be achieved, for example, by laser welding. The laser welding may be performed by partially melting the base material of the second current collector plate (80), or by interposing solder for welding between the second current collector plate (80) and the second electrode tab (12).

[0208] In this case, it is preferable that the solder has a lower melting point compared to the second current collector plate (80) and the second electrode tab (12).

[0209] Referring to FIG. 6, the second current collector plate (80) can be coupled to a coupling surface formed by bending the end of the second electrode tab (12) in a direction parallel to the second current collector plate (80). The bending direction of the second electrode tab (12) may, for example, be a direction toward the winding center (C) of the electrode assembly (10). When the second electrode tab (12) is bent, the uncoated portion forming the second electrode tab (12) may form a bent surface area. The bent surface area has a structure in which the uncoated portion is stacked in multiple layers along the axial direction of the electrode assembly (10). When the second electrode tab (12) has such a bent shape, the space occupied by the second electrode tab (12) is reduced, which can lead to an improvement in energy density. In addition, the increase in the coupling area between the second electrode tab (12) and the second current collector plate (80) can lead to an improvement in coupling strength and a reduction in resistance.

[0210] Referring to FIGS. 7 and 9, at least a portion (81a) of the second current collector plate (80) may be joined to the second electrode tab (12) through welding or the like. Additionally, a predetermined portion of the edge of the second current collector plate (80) may come into contact with the inner surface of the beading portion (21). The predetermined portion may be welded to the inner surface of the beading portion (21). An edge portion (81b) of the second current collector plate (80) adjacent to the predetermined portion may be bent toward the inner surface of the beading portion (21) so that the predetermined portion can reach the inner surface of the beading portion (21).

[0211] In one example, the second current collector plate (80) may include a plurality of sub-plates (81) that extend radially from the center and are spaced apart from each other. In this case, the plurality of sub-plates (81) are each coupled to the second electrode tab (12) and the battery housing (20). The edge regions (81b) of the plurality of sub-plates (81) may be bent and extended toward the joint portion with the battery housing (20).

[0212] When the second current collector plate (80) includes a plurality of sub-plates (81) spaced apart from each other in this manner, the second current collector plate (80) partially covers the lower surface of the electrode assembly (10). Accordingly, sufficient space is secured for the gas generated in the electrode assembly (10) to move toward the cap plate (30), and gas venting toward the lower side of the cylindrical battery (1) can be smoothly performed. Meanwhile, the structure of the second current collector plate (80) having a plurality of sub-plates (81) as described above may also be applied in the same way to the first current collector plate (60) described earlier.

[0213] Referring to FIGS. 3 and 7, a cylindrical battery (1) according to one embodiment of the present invention is provided with an electrode terminal (40) having a first polarity on one axial side and a second electrode terminal (20a) having a second polarity that is electrically insulated from the electrode terminal (40). That is, in the cylindrical battery (1) according to one embodiment of the present invention, since a pair of electrode terminals (30, 20a) are located in the same direction, when electrically connecting a plurality of cylindrical batteries (1), it is possible to place electrical connection components, such as busbars, only on one side of the cylindrical battery (1). This can lead to simplification of the battery pack structure and improvement of energy density.

[0214] In addition, the cylindrical battery (1) has a structure in which one side of a battery housing (20) having a roughly flat shape can be used as a second electrode terminal (20a), thereby securing a sufficient bonding area for bonding electrical connection components, such as busbars, to the second electrode terminal (20a). Accordingly, the cylindrical battery (1) can secure sufficient bonding strength between the electrical connection component and the second electrode terminal (20a), and can reduce the resistance at the bonding area to a desirable level.

[0215] Referring to FIG. 1, a bus bar (B) is connected to each of the first electrode terminal (40) and the second electrode terminal (20a) of the cylindrical battery (1) of the present invention. In order to sufficiently secure an area for coupling the bus bar (B) in each of the first electrode terminal (40) and the second electrode terminal (20a), the width (D1) of the upper surface of the first electrode terminal (40), which is the area exposed to the outside of the battery housing (20), i.e., the terminal exposure portion (41), can be set to approximately 10% to 60% of the width (D2) of the upper surface of the second electrode terminal (20a), i.e., the battery housing (20).

[0216] Preferably, the cylindrical battery may be a cylindrical battery in which the ratio of the form factor (defined as the ratio of the diameter of the cylindrical battery to the height, i.e., the ratio of the diameter (Φ) to the height (H)) is approximately greater than 0.4.

[0217] Here, the form factor refers to a value representing the diameter and height of a cylindrical battery. A cylindrical battery according to one embodiment of the present invention may be, for example, a 46110 battery, a 4875 battery, a 48110 battery, a 4880 battery, or a 4680 battery. In the numerical value representing the form factor, the first two digits represent the diameter of the battery, and the remaining digits represent the height of the battery.

[0218] A battery according to one embodiment of the present invention may be a cylindrical battery having a diameter of approximately 46 mm, a height of approximately 110 mm, and a form factor ratio of 0.418.

[0219] A battery according to another embodiment may be a cylindrical battery having a diameter of approximately 48 mm, a height of approximately 75 mm, and a form factor ratio of 0.640.

[0220] A battery according to another embodiment may be a cylindrical battery having a diameter of approximately 48 mm, a height of approximately 110 mm, and a form factor ratio of 0.436.

[0221] A battery according to another embodiment may be a cylindrical battery having a diameter of approximately 48 mm, a height of approximately 80 mm, and a form factor ratio of 0.600.

[0222] A battery according to another embodiment may be a cylindrical battery having a diameter of approximately 46 mm, a height of approximately 80 mm, and a form factor ratio of 0.575.

[0223] Conventionally, batteries with a form factor ratio of approximately 0.4 or less were used. That is, conventionally, for example, 1865 batteries and 2170 batteries were used. In the case of the 1865 battery, its diameter is approximately 18 mm, its height is approximately 65 mm, and its form factor ratio is 0.277. In the case of the 2170 battery, its diameter is approximately 21 mm, its height is approximately 70 mm, and its form factor ratio is 0.300.

[0224] Referring to FIG. 10, a battery pack (3) according to one embodiment of the present invention comprises a battery assembly in which a plurality of cylindrical batteries (1) according to one embodiment of the present invention as described above are electrically connected, and a pack housing (2) that accommodates the same. In the drawings of the present invention, components such as a busbar for electrical connection, a cooling unit, and a power terminal are omitted for convenience of drawing.

[0225] Referring to FIG. 11, a vehicle (5) according to one embodiment of the present invention may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and includes a battery pack (3) according to one embodiment of the present invention. The vehicle (5) includes four-wheeled vehicles and two-wheeled vehicles. The vehicle (5) operates by receiving power from the battery pack (3) according to one embodiment of the present invention.

[0226] The embodiments described above should be understood as exemplary in all respects and not limiting, and the scope of the invention will be defined by the claims set forth below rather than by the detailed description above. Furthermore, the meaning and scope of the claims set forth below, as well as all modifications and variations derived from equivalents thereof, should be interpreted as being included within the scope of the invention.

[0227] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration according to the present invention were not explicitly described while describing the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized.

Claims

Claim 1 (a) a step of preparing a battery housing having a bottom portion having an open end on one side and a through hole formed on the other side, and a side wall extending between the one side and the other side and formed integrally with the bottom portion; (b) a step of fixing an electrode terminal such that one end is exposed to the interior of the battery housing through the through hole, and interposing an insulating gasket between the electrode terminal and the through hole; (c) a step of preparing a first electrode having a first blank portion on the long side end and a second electrode having a second blank portion on the long side end; (d) a step of forming an electrode assembly with a defined core and outer surface by interposing a separator between the first electrode and the second electrode and winding it around a winding axis, wherein the first blank portion and the second blank portion are exposed to the outside of the separator along the direction of the winding axis; and (e) forming a first folded surface area comprising overlapping layers in which the first plain portion is stacked in multiple layers along the axial direction by folding the first plain portion along the radial direction of the electrode assembly; (f) forming a second folded surface area comprising overlapping layers in which the second plain portion is stacked in multiple layers along the axial direction by folding the second plain portion along the radial direction of the electrode assembly; (g) positioning a first current collector plate on the first folded surface area and combining the first portion, which includes overlapping layers in which the first plain portion is stacked in multiple layers, with the first current collector plate in the first folded surface area; (h) inserting the electrode assembly combined with the first current collector plate into the battery housing through an open end of the battery housing; (i) combining the second portion of the first current collector plate opposite the electrode terminal with the electrode terminal; and (j) covering the open end with a cap plate to finish; comprising a method for manufacturing a battery. Claim 2 A method for manufacturing a battery according to claim 1, wherein the electrode terminal comprises a terminal insertion portion inserted into the interior of the battery housing through the through hole, and step (b) comprises a plastic processing step of plastically processing the end edge of the terminal insertion portion in a radial direction to increase the diameter of the end edge to a diameter greater than the diameter of the through hole. Claim 3 A method for manufacturing a battery according to claim 2, wherein, in the plastic processing step, the end edge is pressed along the axial direction of the electrode assembly using a jig having a structure corresponding to the final shape of the plastic processing. Claim 4 A method for manufacturing a battery according to claim 2, wherein, in the plastic processing step, the plastically processed end edge presses the insulating gasket toward the inner surface of the bottom portion of the battery housing. Claim 5 A method for manufacturing a battery according to claim 1, wherein in step (d), the first non-removable portion and the second non-removable portion are exposed to the outside of the separator along directions opposite to each other in the winding axis direction. Claim 6 A method for manufacturing a battery according to claim 1, wherein step (c) comprises the step of dividing the first and second blank sections into a plurality of sections by forming a plurality of cutting grooves in the first blank section and the second blank section along the winding direction of the electrode assembly. Claim 7 A method for manufacturing a battery according to claim 1, wherein step (i) is a step of welding the electrode terminal and the second part of the first current collection plate using a hollow portion in the core of the electrode assembly. Claim 8 A method for manufacturing a battery according to claim 7, wherein in step (i), a welding laser is irradiated toward a second portion of the first current collector plate facing the electrode terminal through a hollow portion in the core of the electrode assembly. Claim 9 A method for manufacturing a battery according to claim 1, further comprising the step of interposing an insulator between the first current collection plate and the inner surface of the bottom portion of the battery housing. Claim 10 A method for manufacturing a battery according to claim 9, further comprising, prior to step (h), a step of preparing an insulator having a through hole in the center and a shape corresponding to the inner surface of the bottom portion of the battery housing; and a step of installing the insulator on the inner surface of the bottom portion of the battery housing such that the through hole of the insulator surrounds the fixed portion of the electrode terminal. Claim 11 A method for manufacturing a battery according to claim 9, further comprising, prior to step (h), a step of preparing an insulator having a through hole in the center and a shape corresponding to the inner surface of the bottom portion of the battery housing; and a step of fixing the insulator on the first current collection plate such that the through hole of the insulator is located on the core of the electrode assembly. Claim 12 A method for manufacturing a battery according to claim 1, further comprising: a step of combining a second current collector plate with a third portion comprising overlapping layers in which the second unlined portion is overlapped in a plurality of layers in the second folded surface area; and a step of combining at least a portion of the second current collector plate with an inner surface of the battery housing. Claim 13 A method for manufacturing a battery according to claim 1, further comprising: a step of forming a beading portion by pressing the outer surface of an open end of the battery housing toward the inside of the battery housing; a step of combining a second current collector plate with a third portion in the second folded surface area, wherein the second uneven portion comprises overlapping layers formed by overlapping a plurality of layers; and a step of bringing a predetermined area of ​​the edge of the second current collector plate into contact with the inner surface of the beading portion. Claim 14 A method for manufacturing a battery according to claim 13, further comprising the step of bending an edge region of the second current collector plate adjacent to the predetermined region so that the predetermined region can reach the inner surface of the beading portion. Claim 15 A method for manufacturing a battery according to claim 13, further comprising the step of welding the predetermined area to the inner surface of the beading portion. Claim 16 A method for manufacturing a battery according to claim 13, further comprising: a step of interposing a sealing gasket between the edge of the cap plate and the open end of the battery housing; and a step of forming a crimping portion by bending the open end of the battery housing in a centripetal direction to secure the edge of the cap plate to the open end together with the sealing gasket. Claim 17 A method for manufacturing a battery according to claim 16, wherein the crimping portion presses the sealing gasket to bring the predetermined area into close contact with the inner surface of the beading portion. Claim 18 A method for manufacturing a battery according to claim 1, further comprising the step of forming a venting groove on at least one side of the two sides of the cap plate. Claim 19 A method for manufacturing a battery according to claim 1, further comprising, prior to step (j), the step of setting up the battery housing so that the bottom portion of the battery housing faces the ground; and the step of injecting an electrolyte into the interior of the battery housing. Claim 20 A battery manufacturing method according to claim 1, further comprising, after step (j), the step of setting up the battery housing so that the bottom portion of the battery housing faces upward; and the step of performing electrical wiring using the electrode terminal and the area of ​​the outer surface of the bottom portion of the battery housing excluding the area where the electrode terminal is exposed. Claim 21 A battery manufactured by a battery manufacturing method according to any one of claims 1 to 20.

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