Method of manufacturing battery

Abstract

To provide a cylindrical battery having a structure in which positive and negative terminals are applied in the same direction.SOLUTION: A method of manufacturing a battery according to the present disclosure includes: preparing a battery housing having an opening at one side and a bottom having a through-hole at the other side; fixing an electrode terminal to the through-hole; preparing an electrode assembly including a first electrode tab formed of a first uncoated portion and a second electrode tab formed of a second uncoated portion at upper and lower parts, respectively; inserting the electrode assembly into the battery housing through an open end at one side of the battery housing such that the first electrode tab faces the bottom; electrically connecting the first electrode tab to the electrode terminal; and covering the open end with a cap plate.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a battery, and more particularly, to a method for manufacturing a battery having a structure in which a positive electrode terminal and a negative electrode terminal are all disposed adjacent to one side of a cylindrical battery without significantly modifying the structure of a conventional cylindrical battery.

[0002] This application claims priority based on Korean Patent Application No. 10-2021-0137856 filed on October 15, 2021, Korean Patent Application No. 10-2021-0177741 filed on December 13, 2021, and Korean Patent Application No. 10-2021-0194593 filed on December 31, 2021, and the contents disclosed in the specifications and drawings of those applications are incorporated into this application in their entirety. [Background technology]

[0003] Typically, when manufacturing a battery pack using cylindrical batteries, multiple cylindrical batteries are arranged upright in a housing, and the upper and lower ends of the cylindrical batteries are used as positive and negative terminals, respectively, to electrically connect the multiple cylindrical batteries to each other.

[0004] When the positive and negative terminals of a cylindrical battery are located on opposite sides, electrical connection components such as bus bars for electrically connecting multiple cylindrical batteries must be applied to both the top and bottom of the cylindrical batteries, which complicates the electrical connection structure of the battery pack.

[0005] In addition, in the structure of a conventional cylindrical battery, components for insulation and components for ensuring waterproofness and airtightness are applied to the top and bottom of the battery pack, respectively, which increases the number of components applied and complicates the structure.

[0006] Therefore, there is a need for the development of a cylindrical battery having a structure in which the positive and negative terminals are applied in the same direction so that the electrical connection structure of a plurality of cylindrical batteries can be simplified.

[0007] Furthermore, when both the positive and negative terminals are formed at one end in the axial direction, the internal structure of the cylindrical battery having two terminals becomes complicated, which increases manufacturing costs and makes it difficult to improve energy density.

[0008] Furthermore, when both the positive and negative terminals are provided at one axial end, it is necessary to ensure the appropriate areas of both the positive and negative terminals in a simple manner.

[0009] Furthermore, when both the positive and negative terminals are provided at one axial end, the two terminals must provide surfaces that are convenient for connecting electrical connection components.

[0010] On the other hand, if a first electrode terminal and a second electrode terminal are provided at one end and the other end of the cylindrical battery in the axial direction, respectively, when the cylindrical battery is erected to form a battery pack, insulation processing is required between the bottom surface that functions as the terminal and the bottom of the pack housing, which also increases manufacturing costs. Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cylindrical battery having a structure in which a positive terminal and a negative terminal are applied in the same direction.

[0012] Another object of the present invention is to ensure a sufficient area for welding an electrical connection component, such as a bus bar, used to manufacture a battery pack to an electrode terminal of a cylindrical battery when electrically connecting multiple cylindrical batteries in one direction.

[0013] Another object of the present invention is to provide a cylindrical battery in which both positive and negative terminals are provided on the bottom side of a battery housing having an open end and a bottom, which can be prefabricated regardless of whether an electrode assembly is inserted or not.

[0014] Another object of the present invention is to provide a cylindrical battery that can be prefabricated regardless of whether an electrode assembly is inserted, and that can ensure adequate areas for both the positive and negative terminals on the bottom side of the battery housing, and that has surfaces that allow the two terminals to be easily connected to electrical connecting parts.

[0015] Another object of the present invention is to provide a cylindrical battery structure in which both the positive and negative terminals are exposed on one side of the battery, and no terminals are exposed on the other side of the battery.

[0016] Another object of the present invention is to provide a cylindrical battery in which an electrode assembly is closely arranged on the bottom side where two terminals are present, thereby improving energy density.

[0017] The technical object of the present invention is not limited to the above-mentioned object, and other unmentioned objects and advantages of the present invention can be understood from the following description and will become more clearly understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0018] The cylindrical battery of the present invention, which solves the above problems, has two electrode terminals at the bottom of a cylindrical battery housing that is open on one side and has a bottom on the other side.

[0019] The bottom of the battery housing may be machined before the electrode assembly is inserted into the battery housing, which allows for greater flexibility in the machining of the two electrode terminals provided at the bottom.

[0020] This allows the bottom to be processed into a flat shape through a simple process, and when the outer surface of the bottom is configured as a first electrode terminal, electrical connection components for connection thereto and electrical wiring work become easy.

[0021] Furthermore, if a through hole is formed in the bottom portion and an electrode terminal that will become the second electrode terminal is fixed thereto, then both electrodes can be formed on the bottom portion of the battery housing.

[0022] Since the electrode terminals can be processed before the electrode assembly is inserted, the electrode terminals can be processed flat in a simple process, and the electrical connection parts and electrical wiring work for connecting thereto can be simplified.

[0023] The portion of the electrode terminal exposed further outward than the bottom may extend radially outward beyond the inner circumferential surface of the through hole, and the portion of the electrode terminal extending radially outward beyond the through hole may be processed first when the electrode terminal itself is prepared.

[0024] Therefore, the distance that the electrode terminals extend radially outward beyond the through-holes can be easily and precisely determined, and when mass-producing cylindrical batteries, the variation in the areas of the two electrode terminals provided at the bottom of the battery housing can be easily minimized.

[0025] The present invention allows the electrode assembly to be inserted into the battery housing with two electrode terminals already provided at the bottom of the battery housing, thereby allowing the electrode assembly to be accommodated as close or as closely as possible to the bottom of the battery housing.

[0026] The present invention allows for a simple electrical connection structure between the electrode assembly and the two electrode terminals at the bottom of the battery housing where the two electrode terminals are provided, which further increases the energy density inside the battery housing.

[0027] In the battery of the present invention, the two electrode terminals are both provided at the bottom of the cylindrical battery housing, which simplifies the structure for sealing the open end of the cylindrical battery housing.

[0028] Such sealing can be achieved by a cap plate, which has the advantage that it does not have to have polarity.

[0029] Specifically, a cylindrical battery according to one embodiment of the present invention includes a cylindrical battery housing having an open side and a bottom 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 of the battery housing through a through-hole formed in the bottom of the battery housing, and a cap plate covering and sealing the open end of one side of the battery housing.

[0030] Furthermore, a cylindrical battery according to another embodiment of the present invention may include: a cylindrical battery housing having an open side and a bottom side; an electrode terminal fixed to a bottom of the battery housing through a through-hole formed in the bottom of the battery housing; an electrode assembly having a first electrode tab and a second electrode tab, the electrode assembly being received in the battery housing through the open side of the battery housing such that the first electrode tab faces the bottom of the battery housing and the electrode terminal; and a cap plate covering and sealing the open end of the one side of the battery housing when the electrode assembly is received in the battery housing.

[0031] The cap plate may not be electrically connected to the first and second electrode tabs.

[0032] The first electrode tab may be electrically connected to the electrode terminal, and the second electrode tab may be electrically connected to the battery housing.

[0033] Here, the sidewall and bottom of the battery housing can be fabricated as a single piece.

[0034] For example, the side wall and the bottom portion can be integrally formed by drawing a metal plate.

[0035] The first electrode tab faces the bottom, and the first electrode tab may be electrically connected to the electrode terminal.

[0036] An insulator may be interposed between the first electrode tab and the bottom.

[0037] The insulator may not be interposed between the portion of the electrode terminal accommodated inside the battery housing and the first electrode tab.

[0038] The insulator may have a through hole, and the inner circumferential surface of the through hole may surround the outer circumferential edge of the electrode terminal.

[0039] The portion of the electrode terminal accommodated inside the battery housing may face the insulator in the radial direction but may not face the insulator in the axial direction.

[0040] The outer diameter of the electrode terminal exposed to the outside of the bottom of the battery housing may be greater than the inner diameter of the through hole of the bottom of the battery housing.

[0041] A cross section of the through hole at the bottom of the battery housing may be included within a cross section of the electrode terminal exposed to the outside of the bottom.

[0042] The electrode terminals may have exposed portions that cover at least a portion of the bottom of the battery housing in the axial direction.

[0043] The electrode terminal may include a terminal exposure portion extending to the outside of the battery housing and a terminal insertion portion penetrating an upper surface (bottom) of the battery housing.

[0044] The 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 from the battery housing.

[0045] The insulating gasket may include a gasket exposure portion extending to the outside of the battery housing and a gasket insertion portion penetrating a bottom of the battery housing.

[0046] The electrode terminals may be rivet-connected to the inner surface of the bottom of the battery housing.

[0047] The cylindrical battery may further include a first current collector plate having one side coupled to the first electrode tab and the other side coupled to an electrode terminal.

[0048] The cylindrical battery may further include an insulator interposed between the first current collector plate and the battery housing.

[0049] The electrode terminal may penetrate the insulator and be coupled to the first current collecting plate.

[0050] At least one of the first electrode tab and the second electrode tab may be bent toward a winding center of the electrode assembly.

[0051] The cap plate may include a vent configured to rupture and release gas when the internal pressure of the battery housing increases above a certain level.

[0052] A battery pack according to an embodiment of the present invention includes a plurality of batteries according to an embodiment of the present invention and a pack housing that accommodates the batteries.

[0053] An automobile according to an embodiment of the present invention includes a battery pack according to an embodiment of the present invention.

[0054] To achieve the above object, a method for manufacturing a battery according to the present invention includes the steps of: (a) preparing a battery housing having a bottom with one side open and the other side having a through-hole; (b) fixing electrode terminals in the through-holes; (c) preparing an electrode assembly having a first electrode tab made of a first uncoated portion and a second electrode tab made of a second uncoated portion at an upper and lower part, respectively; (d) inserting the electrode assembly into the battery housing through an open end provided on one side of the battery housing so that the first electrode tab faces the bottom; (e) electrically connecting the first electrode tab and the electrode terminal; and (f) covering and sealing the open end with a cap plate.

[0055] The electrode terminal may include a terminal insertion portion inserted into the battery housing through the through hole, and step (b) may include steps (b1) of interposing an insulating gasket between the electrode terminal and the through hole, and (b2) of radially plastically processing a periphery of an end of the terminal insertion portion so that the diameter of the periphery of the end is larger than the diameter of the through hole.

[0056] In the step (b2), the peripheral edge of the end portion may be pressed along the axial direction of the electrode assembly using a jig having a structure corresponding to the final shape of the plastic working.

[0057] In the step (b2), the plastically formed periphery of the end portion may press the insulating gasket against the inner surface of the bottom of the battery housing.

[0058] Step (c) may include the steps of: preparing a first electrode having a first uncoated portion at a long side end thereof and a second electrode having a second uncoated portion at a long side end thereof; forming a plurality of cut grooves in the first uncoated portion and the second uncoated portion along a winding direction of the electrode assembly to divide the first uncoated portion and the second uncoated portion into a plurality of sections; arranging the first electrode and the second electrode such that the first uncoated portion and the second uncoated portion are on opposite sides of the axial direction; interposing a separator between the first electrode and the second electrode and winding the electrode assembly around an axis to form an electrode assembly having a defined core and an outer circumferential surface; and bending the first uncoated portion and the second uncoated portion along a radial direction of the electrode assembly to form a folded surface region having a structure in which the uncoated portions are stacked in multiple layers along the axial direction.

[0059] Step (c) may include coupling a first current collecting plate to the folded surface region of the first uncoated portion, and step (e) may include coupling the electrode terminal and the first current collecting plate to electrically connect the electrode terminal and the first electrode tab.

[0060] Step (e) may include welding the electrode terminal and the first current collecting plate together using a hollow portion in a core of the electrode assembly.

[0061] Step (e) may include irradiating a welding laser toward a welding region of the first current collecting plate facing the electrode terminal through a hollow portion in a core of the electrode assembly.

[0062] The method for manufacturing a battery according to the present invention may further include interposing an insulator between the first current collector plate and an inner surface of the bottom of the battery housing.

[0063] The method for manufacturing a battery according to the present invention may further include, before step (d), the steps of: preparing an insulator having a through hole at its center and a shape corresponding to the inner surface of the bottom of the battery housing; and attaching the insulator to the inner surface of the bottom of the battery housing such that the through hole of the insulator surrounds the fixing portion of the electrode terminal.

[0064] The method for manufacturing a battery according to the present invention may further include, before step (d), the steps of: preparing an insulator having a through hole at its center and a shape corresponding to the inner surface of the bottom of the battery housing; and fixing the insulator on the first current collector plate such that the through hole of the insulator is positioned over the core of the electrode assembly.

[0065] The method for manufacturing a battery according to the present invention may further include the steps of: coupling a second current collector to a second electrode tab of the electrode assembly; and coupling at least a portion of the second current collector to an inner surface of the battery housing.

[0066] The method for manufacturing a battery according to the present invention may further include the steps of: pressing an outer peripheral surface of an open end of the battery housing toward the inside of the battery housing to form a beading portion; welding at least a portion of the second current collector plate to the second electrode tab; and contacting a predetermined region of an edge of the second current collector plate with an inner surface of the beading portion.

[0067] The method for manufacturing a battery according to the present invention may further include bending an edge region of the second current collector plate adjacent to the predetermined region so that the predetermined region reaches an inner surface of the beading portion.

[0068] The method for manufacturing a battery according to the present invention may further include welding the predetermined region to an inner surface of the beading portion.

[0069] The method for manufacturing a battery according to the present invention may further include the steps of: interposing a sealing gasket between a periphery of the cap plate and an open end of the battery housing; and bending the open end of the battery housing in a centripetal direction to form a crimping portion that fixes the periphery of the cap plate to the open end together with the sealing gasket.

[0070] The crimping portion may pressurize the sealing gasket to tightly fit the predetermined area to an inner surface of the beading portion.

[0071] The method for manufacturing a battery according to the present invention may further include forming a venting groove on at least one of both surfaces of the cap plate.

[0072] The method for manufacturing a battery according to the present invention may further include, before step (f), standing the battery housing upright so that a bottom of the battery housing faces the ground, and injecting an electrolyte into the battery housing.

[0073] The method for manufacturing a battery according to the present invention may further include, after step (f), standing the battery housing so that a bottom of the battery housing faces upward, and performing electrical wiring using the electrode terminals and a region of an outer surface of the bottom of the battery housing excluding a region where the electrode terminals are exposed. [Effects of the Invention]

[0074] According to one embodiment 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, thereby simplifying the electrical connection structure of a plurality of cylindrical batteries.

[0075] Furthermore, according to one embodiment of the present invention, the electrode terminal of the cylindrical battery has a sufficient area for welding to an electrical connection part such as a bus bar, thereby ensuring sufficient bonding strength between the electrode terminal and the electrical connection part and reducing the resistance at the bonding site between the electrical connection part and the electrode terminal to a desirable level.

[0076] Furthermore, according to an embodiment of the present invention, the electrode terminal and the electrode assembly can be closely arranged inside the battery housing, thereby increasing the amount of energy stored per volume, i.e., the energy density.

[0077] Furthermore, according to one embodiment of the present invention, the positive and negative terminals are all exposed on one side of the cylindrical battery, while the terminals are not exposed on the other side, which is very advantageous in terms of insulation design.

[0078] In addition, according to one embodiment of the present invention, since the positive and negative terminals are all provided on the bottom side of the battery housing, which is manufactured before the electrode assembly is inserted, the sealing and insulating structure can be easily manufactured, the electrode assembly is closely accommodated on the bottom side, the battery capacity density per volume can be increased, and manufacturing and assembly errors of the positive and negative terminals can be minimized. A battery manufactured in this manner can be easily connected by a bus bar or the like in subsequent processes.

[0079] Furthermore, according to one embodiment of the present invention, the outer circumferential surface of the positive electrode may extend further outward than the inner circumferential surface of the negative electrode through-hole at the bottom of the battery housing, which is fabricated first, regardless of whether the electrode assembly is inserted, thereby enabling arbitrary design of the exposed areas of the positive electrode terminal and the negative electrode terminal.

[0080] The above-mentioned effects and the specific effects of the present invention will be described later by listing specific matters for carrying out the invention.

[0081] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical concepts of the present invention. Therefore, the present invention should not be interpreted as being limited to the matters described in the drawings. [Brief explanation of the drawings]

[0082] [Figure 1] 1 is a diagram showing the appearance of a cylindrical battery according to an embodiment of the present invention; [Figure 2] 1 is a cross-sectional view showing the internal structure of a cylindrical battery according to an embodiment of the present invention. [Figure 3] 1 is a partial cross-sectional view showing an upper structure of a cylindrical battery according to an embodiment of the present invention; [Figure 4] 1 is a partial cross-sectional view showing an upper structure of a cylindrical battery according to an embodiment of the present invention; [Figure 5] 1 is a view showing a coupling structure between a first current collector plate and an electrode assembly applied to the present invention. [Figure 6] 1 is a view showing a coupling structure between a first current collector plate and an electrode assembly applied to the present invention. [Figure 7] 1 is a partial cross-sectional view showing a lower structure of a cylindrical battery according to an embodiment of the present invention; [Figure 8] 1 is a diagram showing the bottom surface of a cylindrical battery according to an embodiment of the present invention. [Figure 9] FIG. 4 is a diagram showing a second current collector plate applied to the present invention. [Figure 10] 1 is a schematic diagram illustrating a battery pack according to an embodiment of the present invention. [Figure 11] 1 is a schematic diagram illustrating a vehicle according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0083] The objects, features, and advantages of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily implement the technical concept of the present invention. In the description of the present invention, if a detailed description of related known technology is deemed to obscure the gist of the present invention, such detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or similar components.

[0084] Although terms such as "first" and "second" are used to indicate various components, these components are not limited by such terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a first component can also be a second component.

[0085] Throughout the specification, unless otherwise stated, each element may be singular or plural.

[0086] Hereinafter, when an arbitrary configuration is placed "on (or under)" a component or "above (or below)" a component, it means not only that the arbitrary configuration is placed in contact with the upper surface (or lower surface) of the component, but also that other configurations may be interposed between the component and the arbitrary configuration placed above (or below) the component.

[0087] Furthermore, when a component is said to be "coupled," "coupled," or "connected" to another component, this does not only mean that the components are directly coupled or connected to each other, but also that other components are "intervening" between the components, or that each component is "coupled," "coupled," or "connected" through other components.

[0088] Furthermore, as used herein, singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "comprise" or "include" are not necessarily interpreted as including all of the components or steps described in the specification, and may mean that some of the components or steps may not be included, and that additional components or steps may also be included.

[0089] Throughout the specification, unless otherwise specified, "A and / or B" means A, B, or A and B, and "C to D" means C or more and D or less, unless otherwise specified.

[0090] For ease of explanation, in this specification, the direction along the length of the winding shaft of an electrode assembly wound into a jelly roll shape is referred to as the axial direction (Z-axis). Furthermore, the direction surrounding the winding shaft is referred to as the circumferential direction or outer circumferential direction. Furthermore, the directions approaching or moving away from the winding shaft are referred to as the radial direction or radial direction (X, Y). Of these, the direction approaching the winding shaft is particularly referred to as the centripetal direction, and the direction moving away from the winding shaft is particularly referred to as the centrifugal direction.

[0091] In this case, the axial direction (Z axis) may correspond to the width direction of the electrode before winding, the circumferential direction may correspond to the length direction of the electrode before winding, and the radial direction (X, Y) may correspond to the normal direction of the electrode before winding.

[0092] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0093] 1 to 4, a cylindrical battery 1 according to an embodiment of the present invention has two electrode terminals at the bottom of a cylindrical battery housing 20 that is open on one side (the bottom in the drawings) and has a bottom on the other side (the top in the drawings).

[0094] The bottom of the battery housing 20 may be completed before inserting the electrode assembly 10 to be accommodated in the battery housing 20. The bottom of the battery housing 20 may be integrally formed with the sidewall by drawing a metal sheet using a press or the like. The bottom may be formed to have a flat profile.

[0095] A through-hole may be formed in the bottom (top in the drawing) of the battery housing 20. The through-hole may be located approximately in the center of the bottom. The center of the bottom and the center of the through-hole may be the same. An electrode terminal 40 may be inserted into and fixed in the through-hole.

[0096] The electrode terminal 40 includes a terminal exposing portion 41 exposed to the outside of the bottom, and a terminal inserting portion 42 connected to the terminal exposing portion 41 and inserted into the battery housing 20 through the through hole.

[0097] An insulating gasket 50 is interposed between the electrode terminal 40 and a member constituting the bottom of the battery housing 20. This seals the gap between the electrode terminal 40 and the battery housing 20, and electrically insulates the electrode terminal 40 from the battery housing 20.

[0098] The bottom of the battery housing 20 itself may be a first electrode terminal having one polarity, and the electrode terminal 40 may be a second electrode terminal having the opposite polarity.

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

[0100] The two electrode terminals provided on the bottom have the advantage of high processing flexibility because they can be processed before the electrode assembly 10 is housed inside the battery housing 20. That is, both of the two electrode terminals have surfaces that are advantageous and convenient for connecting external electrical connection components.

[0101] The bottom of the battery housing 20 can be processed to be flat by a simple process, and if the bottom is configured as a first electrode terminal, the connection work with the electrical connection parts to be connected thereto becomes easy.

[0102] Since the electrode terminal 40 can be processed before the electrode assembly 10 is inserted, the electrode terminal 40 can be processed flat in a simple process, which facilitates the connection work with the electrical connection parts to be connected thereto.

[0103] The exposed terminal portion 41 of the electrode terminal 40 may have a flange shape extending radially outward beyond the inner circumferential surface of the through hole. The exposed terminal portion 41 may be machined first when preparing the components of the electrode terminal 40. Therefore, the dimensions and shape of the exposed terminal portion 41 of the electrode terminal 40 can be easily and precisely determined.

[0104] In this way, when mass-producing cylindrical batteries 1, the bottom of the battery housing 20 and the electrode terminals 40 attached thereto are all pre-machined and assembled before the electrode assembly 10 is placed in the battery housing 20, so that it is easy to minimize variations in the areas of the two electrode terminals provided at the bottom of the battery housing 20 between mass-produced products.

[0105] The present invention allows the electrode assembly 10 to be inserted into the battery housing 20 with two electrode terminals already provided at the bottom of the battery housing 20. This allows the electrode assembly 10 to be accommodated as close or as closely as possible to the bottom of the battery housing 20. The present invention simplifies the electrical connection structure between the electrode assembly 10 and the two electrode terminals at the bottom of the battery housing 20 where the two electrode terminals are provided. This structure further increases the energy density inside the battery housing 20.

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

[0107] The electrode assembly 10 is inserted into the battery housing 20 with the first electrode tab 11 facing the bottom of the battery housing 20 .

[0108] The first electrode tab 11 may be electrically connected to the terminal insertion portion 42 of the electrode terminal 40. As a result, the electrode terminal 40 may have a first polarity.

[0109] The first electrode tab 11 may be connected to the electrode terminal 40 through a 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. As a result, the bottom of the battery housing 20 surrounding the electrode terminal 40 may have a second polarity.

[0111] In the battery 1 of the present invention, both electrode terminals are provided at the bottom of the cylindrical battery housing 20, which simplifies the structure for sealing the open end of the cylindrical battery housing 20 as shown in FIG.

[0112] Such sealing can be achieved by the cap plate 30, which has the advantage that it does not need to have polarity.

[0113] In short, the cylindrical battery 1 of this embodiment includes a cylindrical battery housing 20 that is open on one side and has a bottom on the other side, an electrode assembly 10 that is accommodated in the battery housing 20 and has a first electrode tab 11 and a second electrode tab 12, an electrode terminal 40 that is fixed to the bottom of the battery housing 20 through a through-hole formed in the bottom of the battery housing 20, and a cap plate 30 that covers and seals the open end of one side of the battery housing 20.

[0114] In other words, the cylindrical battery 1 of this embodiment includes a cylindrical battery housing 20 having an open side and a bottom side; an electrode terminal 40 fixed to the bottom of the battery housing 20 through a through-hole formed in the bottom 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 through the open side of the battery housing 20 such that the first electrode tab 11 faces the bottom of the battery housing 20 and the electrode terminal 40; and a cap plate 30 that covers and seals the open end of one side of the battery housing 20 when the electrode assembly 10 is accommodated in the battery housing 20.

[0115] Here, the side walls and the bottom of the battery housing 20 may be processed as a single part before accommodating the electrode assembly 10. The side walls and the bottom of the battery housing 20 may be formed into a single part before accommodating the electrode assembly 10. That is, this concept includes not only manufacturing the battery housing 20 as a single part through a forming process such as drawing in a sheet metal press from the beginning, but also manufacturing the side walls and the bottom as separate parts and then assembling them into a single part before accommodating the electrode assembly 10. The part forming the side walls and the part forming the bottom may be joined by 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. Meanwhile, 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 from being electrically connected to the second electrode tab 12. That is, the cap plate 30 may or may not have polarity. However, since the two electrode terminals are both provided at the bottom of the battery housing 20, the cap plate 30 sealing the opposite open end may not have polarity. Of course, there may be various advantages to having a cap plate 30 that does not have polarity.

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

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

[0119] The insulator 70 may be closely interposed between the bottom of the battery housing 20 and the first electrode tab 11. This can further increase the degree of adhesion between the first current collecting plate 60 and the first electrode tab 11, which will be described later.

[0120] The first current collecting plate 60 is a component that electrically connects the first electrode tab 11 of the electrode assembly 10 to the electrode terminal 40. Referring to FIGS. 3 and 4, one surface of the center of the first current collecting plate 60 is closely attached to or joined with the electrode terminal 40, and the other surface of the first current collecting plate 60 is closely attached to or joined with the first electrode tab 11. The joining may be performed by welding. Therefore, resistance to current passing through the electrode terminal 40 is minimized. Furthermore, this closely attached structure improves utilization of the internal space of the battery housing 20, thereby increasing energy density.

[0121] The insulator 70 does not need to be interposed between the portion of the electrode terminal 40 housed inside the battery housing 20 and the first electrode tab 11 .

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

[0123] The portion of the electrode terminal 40 housed inside the battery housing 20 may face the insulator 70 in the radial direction but 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 of the battery housing 20 may be larger than the inner diameter of the through hole in the bottom of the battery housing 20. In other words, a first cross section of the through hole in the bottom of the battery housing 20 may be included within a second cross section of the electrode terminal 40 exposed to the outside of the bottom. The first cross section and the second cross section are cross sections perpendicular to the axial direction. The first cross section being included in the second 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 included in the second cross section. As a result, the exposed portion of the electrode terminal 40 may cover at least a portion of the bottom of the battery housing 20 in the radial direction. This allows the surface area of both the bottom and the surface area of the electrode terminal 40 to be appropriately secured.

[0125] The cylindrical battery 1 can be fabricated as follows.

[0126] First, a cylindrical battery housing 20 is prepared, which has one open side and a bottom with a through-hole on the other side. Then, the electrode terminal 40 is fixed in the through-hole. When the electrode terminal 40 is fixed in the through-hole, the insulating gasket 50 may be tightly interposed between the electrode terminal 40 and the through-hole formed in the bottom of the battery housing 20.

[0127] Next, an electrode assembly 10 is prepared, which has a first electrode tab 11 and a second electrode tab 12 at both ends.

[0128] Before inserting the electrode assembly 10 into the battery housing 20, a first current collector 60 may be stacked axially on the first electrode tab 11. The first electrode tab 11 may be bent radially as shown in FIG. 6, and the first current collector 60 may be joined to the bent first electrode tab 11 by welding or other methods. To facilitate bending of the first electrode tab 11, cut grooves may be formed at regular intervals along the winding direction in the uncoated portion forming the first electrode tab 11. The extension direction of the cut grooves may be in the axial direction of the electrode assembly 10. Of course, as shown in FIG. 5, the first current collector 60 may be stacked without bending the first electrode tab 11.

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

[0130] The insulator 70 may be pre-attached to the inner surface of the bottom 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 joined. An adhesive or adhesive tape may be used to attach the insulator 70. If the insulator 70 is made of a heat-shrinkable polymer resin, the insulator 70 may be fixed to the end of the electrode assembly 10 by applying heat. The insulator 70 may have a sleeve structure extending axially along the outer circumferential surface of the electrode assembly 10 to cover the upper end of the outer circumferential surface of the electrode assembly 10.

[0131] After the electrode assembly 10 is inserted into the battery housing 20, the first electrode tab 11 is electrically connected to the electrode terminal 40, and the second electrode tab 12 is electrically connected to the battery housing 20.

[0132] The electrode terminal 40 may be aligned with a hollow portion provided at the winding center C of the electrode assembly 10. Therefore, a welding device may 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 to the center portion of the first current collecting plate 60. Because the terminal insertion portion 42 of the electrode terminal 40 has a flat lower end, it may be welded in close contact with the center portion of the first current collecting plate 60. When laser welding the first current collecting plate to the terminal insertion portion 42 of the electrode terminal 40, a laser beam may 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 collecting plate 80 is joined to the second electrode tab 12, and an edge of the second current collecting plate 80 may be connected to the inner surface of the battery housing 20. As shown in Figures 5 and 6, the second current collecting plate 80 may be joined to the second electrode tab 12 with or without bending the second electrode tab 12 in a radial direction. To facilitate bending of the second electrode tab 12, cut grooves may be formed at regular intervals along the winding direction in the uncoated portion forming the second electrode tab 12. The extension direction of the cut grooves may be the axial direction of the electrode assembly 10.

[0134] 5, 6, and 9, a hole may be formed in the center of the second current collecting plate 80. This hole may serve as a passage for inserting a device for joining the first current collecting plate 60 and the electrode terminal 40 or for passing a laser beam. That is, the second current collecting plate 80 may be joined to the second electrode tab 12 before inserting the electrode assembly 10 into the battery housing 20. Of course, the second current collecting plate 80 may be joined to the second electrode tab 12 after the electrode assembly 10 is inserted into the battery housing 20.

[0135] Next, the open end of the battery housing 20 is covered and sealed with the cap plate 30. At this time, a sealing gasket 90 is interposed between the open end of the battery housing 20 and the periphery of the cap plate 30, and the cap plate 30 is crimped together with the sealing gasket 90 at 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 by forming the beading portion 21 before forming the crimping portion 22, the periphery of the lower end of the electrode assembly 10 can be supported so that the electrode assembly 10 inserted into the battery housing 20 does not slip out again.

[0137] An edge of the second current collecting plate 80 may be fitted into the beading portion 21. In particular, when the crimping portion 22 is formed with the edge of the second current collecting plate 80 interposed between the beading portion 21 and the cap plate 30, the second current collecting plate 80 may be tightly attached to the battery housing 20. Of course, the sealing gasket 90 may be interposed between the cap plate 30 and the edge of the second current collecting plate 80 to maintain the non-polarity of the cap plate 30. In this case, the edge of the second current collecting plate 80 may be interposed and fixed between the sealing gasket 90 and the inner circumferential surface of the beading portion 21.

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

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

[0140] The electrode assembly 10 includes a first electrode having a first polarity, a second electrode having a second polarity, and a separator interposed between the first and second electrodes. The first electrode is a positive or negative electrode, and the second electrode has the opposite polarity to the first electrode.

[0141] The electrode assembly 10 may have, for example, a jelly roll structure.

[0142] That is, the electrode assembly 10 may be manufactured by sequentially stacking a first separator, a first electrode, a second separator, and a second electrode at least once, and winding the stack around a winding center C. The electrode assembly 10 may have a jelly roll structure. An outermost winding turn of a separator may be provided on the outer periphery of the electrode assembly 10 for insulation from the battery housing 20.

[0143] The first electrode includes a first electrode collector and a first electrode active material layer coated on one or both sides of the first electrode collector. A first uncoated portion where the first electrode active material is not coated is present at one end of the first electrode collector in the width direction (Z-axis direction). The first uncoated portion extends along the winding direction of the electrode assembly 10.

[0144] The first uncoated portion functions as a first electrode tab 11. The first electrode tab 11 is provided at an upper portion of the electrode assembly 10 housed in the battery housing 20 in the height direction (Z-axis direction).

[0145] The second electrode includes a second electrode collector and a second electrode active material layer coated on one or both sides of the second electrode collector. The other end of the second electrode collector in the width direction (Z-axis direction) has a second uncoated portion where the second electrode active material is not coated. The second uncoated portion extends along the winding direction of the electrode assembly 10.

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

[0147] The first electrode tab 11 and the second electrode tab 12 extend and protrude out of the separator in opposite directions in the axial direction of the electrode assembly 10. Therefore, the first uncoated portion of the first electrode and the second uncoated portion of the second electrode exposed to the outside from 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 spirally wound structure. A plurality of cut grooves may be formed in the first uncoated portion and the second uncoated portion at regular intervals along the winding direction of the electrode assembly 10. The cut grooves divide the first uncoated portion and the second uncoated portion into a plurality of sections, facilitating the folding process of the uncoated portions.

[0149] In the present invention, the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate may be any active material known in the art without any limitation.

[0150] In one example, the positive electrode active material has the general chemical formula A (A x M y )O 2+z(A contains at least one element of 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; x≧0, 1≦x + y≦2, -0.1≦z≦2; the stoichiometric coefficients x, y and z are selected so that the compound maintains electrical neutrality) and may contain an alkali metal compound represented by.

[0151] As another example, the positive electrode active material is an alkali metal compound xLiM disclosed in U.S. Patent No. 6,677,082, U.S. Patent No. 6,680,143, etc. 1 O2-(1 - x)Li2M 2 O3(M 1 contains at least one element having an average oxidation state of 3; M 2 contains at least one element having an average oxidation state of 4; 0≦x≦1).

[0152] As yet another example, the positive electrode active material has 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 contains at least one element selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg and Al; M 2 contains 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 contains a halogen group element selectively containing F; 0 < a≦2, 0≦x≦1, 0≦y < 1, 0≦z < 1; the stoichiometric coefficients a, x, y and z are selected so that the compound maintains electrical neutrality), or may be a lithium metal phosphate represented by Li3M2(PO4)3 [M contains at least one element selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg and Al].

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

[0154] For example, the negative electrode active material may be a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, or tin or a tin compound. Metal oxides with a potential of less than 2 V, such as TiO2 and SnO2, may also be used as the negative electrode active material. The carbon material may be either low-crystalline carbon or high-crystalline carbon.

[0155] The separator may be a porous polymer film, for example, a porous polymer film made of a polyolefin polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene / butene copolymer, an ethylene / hexene copolymer, an ethylene / methacrylate copolymer, etc., either alone or in a laminate. Alternatively, the separator may be a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high-melting-point glass fiber, polyethylene terephthalate fiber, etc.

[0156] At least one surface of the separator may include a coating layer of inorganic particles. Alternatively, the separator itself may be made of a coating layer of inorganic particles. The particles constituting the coating layer may have a structure in which they are bound with a binder so that there is interstitial volume between adjacent particles.

[0157] The inorganic particles may be made of an inorganic material having a dielectric constant of 5 or more. Non-limiting examples of the inorganic particles include Pb(Zr,Ti)O3 (PZT), Pb 1-x La x Zr 1-y Ti y O3(PLZT), PB(Mg3Nb 2 / 3)O3-PbTiO3 (PMN-PT), BaTiO3, hafnia (HfO2), SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO, and Y2O3.

[0158] The electrolyte is A + B - where A + Li + , Na + , K. + or a combination thereof. - 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 - The anion comprises one or more anions selected from the group consisting of:

[0159] The electrolyte may be dissolved in an organic solvent such as 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), γ-butyrolactone, or a mixture thereof.

[0160] 1 to 4, the battery housing 20 is a generally cylindrical container having an open 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 peripheral surface) and top surface of the battery housing 20 may be integrally formed. The top surface (surface parallel to the XY plane) of the battery housing 20 has a substantially flat shape. The bottom of the battery housing 20, located opposite the open end, forms a closed end. The battery housing 20 accommodates the 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 to, for example, 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] 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 below the electrode assembly 10. The beading portion 21 is formed by pressing around the outer periphery of the battery housing 20. The beading portion 21 prevents the electrode assembly 10, which has a size approximately corresponding to the internal space of the battery housing 20, from slipping out of an open end formed at the lower end of the battery housing 20, and may function as a support on which edges of the cap plate 30 and the second current collector plate 80 are placed.

[0164] The crimping portion 22 is formed below the beading portion 21. The crimping portion 22 is extended and bent to enclose the outer circumferential surface of the cap plate 30 disposed 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 the case where the battery housing 20 does not include such a beading portion 21 and / or crimping portion 22. In the present invention, when the battery housing 20 does not include the beading portion 21 and / or the 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 achieved, for example, by adding a component that can function as a stopper for the electrode assembly 10 and / or by adding a structure on which the cap plate 30 can be placed and / or by welding between the battery housing 20 and the cap plate 30.

[0166] The area forming the bottom of the battery housing 20 may have a thickness of about 0.5 mm to 1.0 mm, and more preferably about 0.6 mm to 0.8 mm. The sidewall portion forming the outer periphery of the battery housing 20 may have a thickness of about 0.3 mm to 0.8 mm, and more preferably about 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 about 1.5 μm to 6.0 μm.

[0167] The thinner the battery housing 20, the larger the internal space becomes, thereby improving the energy density and enabling the cylindrical battery 1 to be manufactured with a large capacity.

[0168] On the other hand, the thicker the battery, the less likely it is that a flame will spread to adjacent batteries in an explosion test, which is advantageous in terms of safety.

[0169] The thinner the plating layer, the more susceptible it is to corrosion, and the thicker the plating, the more difficult the manufacturing process or the higher the likelihood of plating peeling. It is necessary to set an optimal thickness for the battery housing 20 and the optimal thickness for the plating layer, taking all of these conditions into consideration. Furthermore, it is necessary to control the thickness of the bottom and the thickness of the sidewalls of the battery housing 20, respectively, taking all of these conditions into consideration.

[0170] 2 and 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 constitutes the bottom surface of the cylindrical battery 1. In the cylindrical battery 1 of the present invention, the cap plate 30 has no polarity even when made of a conductive metal material. "No polarity" means 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 or negative terminal. As such, 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 need to be a conductive metal.

[0171] When the battery housing 20 of the present invention includes a beading portion 21, the cap plate 30 may be placed on the beading portion 21 formed on the battery housing 20. When the battery housing 20 of the present invention includes a crimping portion 22, the cap plate 30 may be 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 described above, the battery housing 20 of the present invention may not have the beading portion 21 and / or the crimping portion 22. In this case, the sealing gasket 90 may be interposed between the cap plate 30 and a fixing structure provided on the open end side of the battery housing 20 to ensure airtightness of the battery housing 20.

[0173] 7 and 8, the cap plate 30 may further include a venting portion 31 to prevent the internal pressure of the battery housing 20 from increasing beyond a preset value due to gas generated inside the battery housing 20. The venting portion 31 corresponds to a region of the cap plate 30 that is thinner than the surrounding region. The venting portion 31 is structurally weaker than the surrounding region. 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, allowing the gas generated inside the battery housing 20 to be discharged. The venting portion 31 may be formed, for example, by notching one or both surfaces of the cap plate 30 to partially reduce the thickness of the cap plate 30.

[0174] In accordance with one embodiment of the present invention, the cylindrical battery 1 has a structure in which both the positive and negative terminals are located at the top, making the upper structure more complex than the lower structure. Therefore, to facilitate the release of gas generated inside the battery housing 20, a vent 31 may be formed in the cap plate 30 constituting the bottom of the cylindrical battery 1. As shown in FIG. 7 , the lower end of the cap plate 30 is preferably located higher than the lower end of the battery housing 20. In this case, even if the lower end of the battery housing 20 contacts the ground or the bottom of a housing for configuring a module or pack, the cap plate 30 does not contact the ground or the bottom of the housing for configuring a module or pack. This prevents the pressure required to break the vent 31 from varying from the designed value due to the weight of the cylindrical battery 1, thereby ensuring smooth rupture of the vent 31.

[0175] 7 and 8, in terms of ease of breaking, 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 when the same venting pressure is applied. Furthermore, in terms of smooth discharge of venting gas, the greater the distance from the center of the cap plate 30 to the venting portion 31, the more advantageous it is. From this perspective, it is advantageous for the venting portion 31 to be formed along the periphery of a substantially flat region that protrudes downward (downward in FIG. 7) from the peripheral region of the cap plate 30.

[0176] 8 shows the venting portion 31 formed continuously in a substantially 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 substantially circular shape on the cap plate 30, or may be formed in a substantially linear shape or other shapes.

[0177] 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, i.e., the surface opposite the open end of the battery housing 20 (a surface parallel to the XY plane). The electrode terminal 40 is electrically connected to, for example, the first electrode tab 11 of the electrode assembly 10. In this case, the electrode terminal 40 has a first polarity. Therefore, the electrode terminal 40 can function as the first electrode terminal in the cylindrical battery 1 of the present invention. When the electrode terminal 40 has this first polarity, the electrode terminal 40 is electrically insulated from the battery housing 20, which has a second polarity. Electrical insulation between the electrode terminal 40 and the battery housing 20 can be achieved 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 portion of the electrode terminal 40. Alternatively, a method may be applied in which the electrode terminals 40 are structurally and firmly fixed so that they cannot come into contact with the battery housing 20. Alternatively, a combination of two or more of the above-mentioned methods may be applied.

[0178] The electrode terminal 40 includes a terminal exposing portion 41 and a terminal inserting portion 42. The terminal exposing portion 41 is exposed to the outside of the battery housing 20. The terminal exposing portion 41 may be located approximately at the center of the upper surface of the battery housing 20. The maximum width of the terminal exposing portion 41 may be greater than the maximum width of the through-hole formed in the battery housing 20. The terminal inserting portion 42 may penetrate approximately the center of the upper surface of the battery housing 20 to be electrically connected to the first electrode tab 11. A peripheral region at an end of the terminal inserting portion 42 may be bent toward the inner surface of the battery housing 20 through plastic processing, and may be rivet-connected to the inner surface. Plastic processing refers to a method of deforming the lower end of the electrode terminal 40 by applying pressure with a jig. Through plastic processing, the peripheral region at the end of the terminal inserting portion 42 expands radially and increases in diameter. The jig has a structure corresponding to the final shape of the terminal inserting portion 42. Plastic processing is a metal processing technique that utilizes the softness and malleability of metal. The plastic working may be caulking. During the plastic working, pressure may be applied multiple times using a jig. The portion bent toward the inner surface of the terminal insertion portion 42 crimps the insulating gasket 50 toward the inner surface, thereby providing airtightness between the electrode terminal 40 and the battery housing 20. Because the peripheral region of the end of the terminal insertion portion 42 is bent toward the inner surface of the battery housing 20, the maximum width of the end of the terminal insertion portion 42 is greater than the maximum width of the through-hole in the battery housing 20.

[0179] Meanwhile, when the cylindrical battery 1 of the present invention includes a first current collecting plate 60, the central region of the terminal insertion portion 42 may be coupled to the first current collecting plate 60. The central region of the terminal insertion portion 42 may be, for example, substantially cylindrical. The diameter of the bottom surface of the central region of the terminal insertion portion 42 may be set to approximately 6.2 mm.

[0180] The connection between the bottom surface of the central region of the terminal insertion portion 42 and the first current collector plate 60 can be performed by, for example, laser welding or ultrasonic welding.

[0181] The laser welding may be performed by irradiating a laser through a hollow portion formed in the winding center C of the electrode assembly 10 to form a laser weld line on one surface of the first current collecting plate 60. The laser weld line may be formed in a shape that forms a substantially concentric circle with the bottom surface of the central region of the terminal insertion portion 42 on one surface of the first current collecting plate 60. The weld line may be formed continuously or partially discontinuously.

[0182] The concentric welding line may have a diameter that is approximately 60% to 80% of the diameter of the bottom surface of the central region of the terminal insertion portion 42. For example, if the diameter of the bottom surface of the central region of the terminal insertion portion 42 is approximately 6.2 mm, the diameter of the circle formed by the welding line is preferably approximately 4.0 mm or more. If the diameter of the circle formed by the welding line is too small, the bonding strength of the welding may be insufficient. On the other hand, if the diameter of the circle formed by the welding line is too large, the electrode assembly 10 may be damaged by heat and / or welding spatter.

[0183] The ultrasonic welding may be performed by inserting a welding rod for ultrasonic welding through a hollow formed in the winding center C of the electrode assembly 10. The weld formed by ultrasonic welding is formed within the contact interface between the bottom surface of the central region of the terminal insertion portion 42 and the first current collecting plate 60. The weld formed by ultrasonic welding may be formed entirely within a concentric circle having a diameter that is approximately 30% to 80% of the diameter of the bottom surface of the central region of the terminal insertion portion 42. For example, if the diameter of the bottom surface of the central region of the terminal insertion portion 42 is approximately 6.2 mm, the diameter of the circle formed by the ultrasonic welding may be preferably approximately 2.0 mm or more. If the diameter of the circle formed by the ultrasonic welding is too small, the bonding strength of the weld may be insufficient. On the other hand, if the diameter of the circle formed by the ultrasonic welding is too large, the electrode assembly 10 may be damaged by 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 outside the battery housing 20 have opposite polarities but face the same direction. In addition, 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 a shape that protrudes upward at its center, the terminal exposed 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 concave shape that is concave downward at its center, i.e., toward the electrode assembly 10, the upper surface of the battery housing 20 may protrude further upward than the terminal exposed portion 41 of the electrode terminal 40.

[0185] Meanwhile, when the upper surface of the battery housing 20 is concave at its center downward, i.e., toward the electrode assembly 10, the upper surface of the battery housing 20 and the upper surface of the terminal exposing portion 41 may be substantially flush with each other depending on the depth of the concavity and the thickness of the terminal exposing 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 exposing 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 having opposite polarities from coming into contact with each other.

[0187] This allows the upper surface of the battery housing 20, which has a substantially flat shape, to function as the 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 exposing portion 51 is interposed between the terminal exposing portion 41 of the electrode terminal 40 and the battery housing 20. The gasket inserting portion 52 is interposed between the terminal inserting portion 42 of the electrode terminal 40 and the through-hole of the battery housing 20. The gasket inserting portion 52 may be deformed together with the terminal inserting portion 42 during plastic processing, and may be closely attached 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 be extended to cover the outer circumferential surface of the terminal exposure portion 41 of the electrode terminal 40 .

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

[0192] When the insulating gasket 50 is made of a resin material, the insulating gasket 50 can be joined to the battery housing 20 and the electrode terminal 40 by heat sealing.

[0193] In this case, the airtightness is enhanced 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. Meanwhile, when the gasket exposing portion 51 of the insulating gasket 50 extends to the upper surface of the terminal exposing portion 41, the electrode terminal 40 may be bonded to the insulating gasket 50 by insert injection.

[0194] According to an embodiment of the present invention, the insulating gasket 50, the insulator 70, and the sealing gasket 90 may be made of the same material, but are not necessarily limited to this. The thickness of the insulating gasket 50 and the thickness of the insulator 70 may be the same, but are not necessarily limited to this. If the thicknesses are different, the insulator 70 may be thinner than the insulating gasket 50, or vice versa.

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

[0196] The cylindrical sidewall of the battery housing 20 may be formed as one piece with the second electrode terminal 20a so that there is no discontinuity between the sidewall and the second electrode terminal 20a. The connection from the sidewall 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 edge having a predetermined angle.

[0197] 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, the first current collecting plate 60 may have a plurality of protrusions and recesses formed radially on the lower surface thereof. When the protrusions and recesses are formed, the first current collecting plate 60 may be pressed against the first electrode tab 11 to fit into the protrusions and recesses.

[0198] 5, the first current collecting plate 60 is coupled to an end of the first electrode tab 11. The first electrode tab 11 and the first current collecting plate 60 may be coupled together by, for example, laser welding. The laser welding may be performed by partially melting the base material of the first current collecting plate 60, and may be performed with solder interposed between the first current collecting plate 60 and the first electrode tab 11. In this case, it is preferable that the solder has a lower melting point than the first current collecting plate 60 and the first electrode tab 11.

[0199] Referring to FIG. 6 , the first current collecting plate 60 may be coupled to a coupling surface formed by bending an end of the first electrode tab 11 in a direction parallel to the first current collecting plate 60. The bending direction of the first electrode tab 11 may be, for example, 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 folded surface region. The folded surface region has a structure in which the uncoated portions are stacked in multiple layers along the axial direction of the electrode assembly 10. When the first electrode tab 11 has such a folded shape, the space occupied by the first electrode tab 11 is reduced, thereby improving energy density. Furthermore, the increased coupling area between the first electrode tab 11 and the first current collecting plate 60 may improve coupling strength and reduce resistance.

[0200] 2 to 4, the insulator 70 is provided between the upper end 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 upper part 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 the first current collecting plate 60 and the battery housing 20. The insulator 70 may also be interposed between the upper end of the outer periphery 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 upper end of the electrode assembly 10. However, the present invention is not limited thereto, and the first current collecting plate 60 may be formed to extend only partially across the upper end of the electrode assembly 10.

[0201] When the cylindrical battery 1 according to an embodiment of the present invention includes the insulator 70, the terminal insertion portion 42 of the electrode terminal 40 penetrates (passes through) the insulator 70 and is coupled to the first current collecting plate 60 or the first electrode tab 11.

[0202] The insulator 70 may have a through hole adjacent to the winding center C. The terminal insertion portion 42 of the electrode terminal 40 may directly contact the first current collector plate 60 through the through hole.

[0203] In one embodiment of the present invention, the terminal insertion portion 42 may have a circular planar shape, but is not limited to this. The terminal insertion portion 42 may alternatively have a polygonal, star-shaped, or a shape with legs extending from the center.

[0204] 2 and 7, the second current collecting plate 80 is coupled to the lower part of the electrode assembly 10. The second current collecting plate 80 is made of a conductive metal material and is connected to the second electrode tab 12. The second current collecting plate 80 is also electrically connected to the battery housing 20. The second current collecting plate 80 may be interposed and fixed between the inner surface of the battery housing 20 and a sealing gasket 90, as shown in FIG.

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

[0206] Although not shown, the second current collecting plate 80 may have a plurality of projections and recesses formed radially on one surface thereof. When projections and recesses are formed, the second current collecting plate 80 may be pressed against the projections and recesses to press the second electrode tab 12 into the projections and recesses.

[0207] 5, the second current collecting plate 80 is coupled to an end of the second electrode tab 12. The second electrode tab 12 and the second current collecting plate 80 may be coupled together by, for example, laser welding. The laser welding may be performed by partially melting the base material of the second current collecting plate 80, and may be performed with solder interposed between the second current collecting plate 80 and the second electrode tab 12 for welding.

[0208] In this case, it is desirable that the solder has a lower melting point than the second current collector plate 80 and the second electrode tab 12 .

[0209] Referring to FIG. 6 , the second current collector plate 80 may be coupled to a coupling surface formed by bending an 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 be, for example, 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 folded surface region. The folded surface region has a structure in which the uncoated portions are stacked in multiple layers along the axial direction of the electrode assembly 10. When the second electrode tab 12 has such a folded shape, the space occupied by the second electrode tab 12 is reduced, thereby improving energy density. Furthermore, the increased coupling area between the second electrode tab 12 and the second current collector plate 80 may improve coupling strength and reduce resistance.

[0210] 7 and 9, at least a portion 81a of the second current collecting plate 80 may be coupled to the second electrode tab 12 by welding or the like. Also, a predetermined region of an edge of the second current collecting plate 80 may contact an inner surface of the beading portion 21. The predetermined region may be welded to the inner surface of the beading portion 21. An edge region 81b of the second current collecting plate 80 adjacent to the predetermined region may be bent toward the inner surface of the beading portion 21 so that the predetermined region reaches the inner surface of the beading portion 21.

[0211] In one example, the second current collecting plate 80 may include a plurality of sub-plates 81 extending radially from a center and spaced apart from one another. In this case, each of the sub-plates 81 is coupled to the second electrode tab 12 and the battery housing 20. Edge regions 81b of the sub-plates 81 may be bent and extended toward the joining portions with the battery housing 20.

[0212] When the second current collecting plate 80 includes a plurality of sub-plates 81 spaced apart from one another, the second current collecting plate 80 partially covers the lower surface of the electrode assembly 10. Therefore, a sufficient space is secured for gas generated in the electrode assembly 10 to move toward the cap plate 30, enabling smooth gas venting downward of the cylindrical battery 1. Meanwhile, the structure of the second current collecting plate 80 including a plurality of sub-plates 81 as described above can be similarly applied to the first current collecting plate 60 described above.

[0213] 3 and 7, a cylindrical battery 1 according to an embodiment of the present invention includes an electrode terminal 40 having a first polarity on one side in the axial direction, and a second electrode terminal 20a electrically insulated from the electrode terminal 40 and having a second polarity. That is, in the cylindrical battery 1 according to an embodiment of the present invention, a pair of electrode terminals (first electrode terminal 40, second electrode terminal 20a) are positioned in the same direction, so when multiple cylindrical batteries 1 are electrically connected, electrical connection components such as a bus bar can be disposed on only one side of the cylindrical battery 1. This can simplify the battery pack structure and improve the energy density.

[0214] Furthermore, the cylindrical battery 1 has a structure in which one surface of the battery housing 20, which has a substantially flat shape, can be used as the second electrode terminal 20a, thereby ensuring a sufficient bonding area when bonding an electrical connection part such as a bus bar to the second electrode terminal 20a. As a result, the cylindrical battery 1 can ensure sufficient bonding strength between the electrical connection part and the second electrode terminal 20a, and can reduce the resistance at the bonding site to a desirable level.

[0215] 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. To ensure a sufficient area for coupling of the bus bar B to each of the first electrode terminal 40 and the second electrode terminal 20a, the width D1 of the upper surface of the region of the first electrode terminal 40 exposed to the outside of the battery housing 20, i.e., the terminal exposure portion 41, may be set to about 10% to 60% of the width D2 of the second electrode terminal 20a, i.e., the upper surface of the battery housing 20.

[0216] Desirably, the cylindrical battery may be, for example, a cylindrical battery having a form factor ratio (defined as the diameter of a cylindrical battery divided by its height, i.e., the ratio of height (H) to diameter (Φ)) greater than about 0.4.

[0217] Here, the term "form factor" refers to a value indicating the diameter and height of a cylindrical battery. A cylindrical battery according to an 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 form factor number, the first two digits indicate the diameter of the battery, and the remaining digits indicate the height of the battery.

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

[0219] Another embodiment of the battery may be a generally cylindrical battery having a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of 0.640.

[0220] In yet another embodiment, the battery may be a generally cylindrical battery having a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of 0.436.

[0221] In yet another embodiment, the battery may be a generally cylindrical battery having a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of 0.600.

[0222] In yet another embodiment, the battery may be a generally cylindrical battery having a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of 0.575.

[0223] Conventionally, batteries with a form factor ratio of approximately 0.4 or less have been used. For example, 1865 batteries and 2170 batteries have been used. 1865 batteries have a diameter of approximately 18 mm and a height of approximately 65 mm, resulting in a form factor ratio of 0.277. 2170 batteries have a diameter of approximately 21 mm and a height of approximately 70 mm, resulting in a form factor ratio of 0.300.

[0224] 10, a battery pack 3 according to one embodiment of the present invention includes a battery assembly in which a plurality of cylindrical batteries 1 according to one embodiment of the present invention are electrically connected as described above, and a pack housing 2 that accommodates the battery assembly. For convenience of illustration, components such as bus bars for electrical connection, a cooling unit, and power terminals are not shown.

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

[0226] The above-described embodiments are illustrative in all respects and are not limiting, and the scope of the present invention is defined by the appended claims rather than the above detailed description. All modifications and variations derived from the meaning and scope of the claims, as well as equivalent concepts, are intended to be included within the scope of the present invention.

[0227] Although the present invention has been described above with reference to the drawings illustrating the present invention, it is obvious that the present invention is not limited to the embodiments and drawings shown in the present specification, and that various modifications may be made by those skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the operational effects of the configurations of the present invention are not clearly stated in the description of the embodiments, it goes without saying that the effects that can be predicted by the corresponding configurations should also be recognized.

[0228] 5. Automobiles 10 Electrode assembly 11 First electrode tab 12 Second electrode tab 20 Cylindrical Battery Housing 21 Beading section 22 Crimping section 30 Cap Plate 31 Venting section 40 Electrode terminal, 1st electrode terminal 41 Exposed terminal part 42 Terminal insertion part 50 Insulation gasket 51 Exposed gasket 52 Gasket insert 60 First current collector plate 70 Insulator 80 Second current collector plate 81 Subplate 90 Sealing Gasket

Claims

1. (a) preparing a battery housing having a bottom with one side open and the other side provided with a through hole; (b) fixing an electrode terminal to the through hole; (c) preparing an electrode assembly having a first electrode tab formed of a first uncoated portion and a second electrode tab formed of a second uncoated portion at an upper and lower portion, respectively; (d) inserting the electrode assembly into the battery housing through an open end provided on one side of the battery housing so that the first electrode tab faces the bottom; (e) electrically connecting the first electrode tab and the electrode terminal; (f) covering and sealing the open end with a cap plate; A method for manufacturing a battery, comprising:

2. the electrode terminal includes a terminal insertion portion that is inserted into the battery housing through the through hole, The step (b) (b1) interposing an insulating gasket between the electrode terminal and the through hole; (b2) performing radial plastic working on the periphery of the end of the terminal insertion portion so that the diameter of the periphery of the end is increased to be greater than the diameter of the through hole; A method for manufacturing the battery of claim 1, comprising:

3. 3. The method of claim 2, wherein in step (b2), the peripheral edge of the end portion is pressed along the axial direction of the electrode assembly using a jig having a structure corresponding to the final shape of the plastic working.

4. 3. The method of claim 2, wherein in step (b2), the plastically formed periphery of the end presses the insulating gasket against the inner surface of the bottom of the battery housing.

5. The step (c) preparing a first electrode having a first uncoated portion at a long side end thereof and a second electrode having a second uncoated portion at a long side end thereof; forming a plurality of cutting grooves in the first uncoated region and the second uncoated region along a winding direction of the electrode assembly to divide the first uncoated region and the second uncoated region into a plurality of sections; disposing the first electrode and the second electrode such that the first uncoated portion and the second uncoated portion are on opposite sides of each other in an axial direction, and winding the first electrode and the second electrode around an axis with a separator interposed between them to form an electrode assembly having a defined core and an outer circumferential surface; forming a folded surface region having a structure in which the uncoated portions are stacked in multiple layers along the axial direction by bending the first uncoated portion and the second uncoated portion along a radial direction of the electrode assembly; A method for manufacturing the battery of claim 1, comprising:

6. Step (c) includes coupling a first current collecting plate to a folded surface region of the first uncoated portion; 6. The method of manufacturing a battery according to claim 5, wherein step (e) comprises joining the electrode terminal and the first current collector plate to electrically connect the electrode terminal and the first electrode tab.

7. 7. The method of manufacturing a battery according to claim 6, wherein step (e) comprises welding the electrode terminal and the first current collector plate together using a hollow portion in a core of the electrode assembly.

8. 10. The method of claim 7, wherein step (e) comprises irradiating a welding laser toward a welding region of the first current collector plate facing the electrode terminal through a hollow portion of a core of the electrode assembly.

9. The method for manufacturing a battery according to any one of claims 6 to 8, further comprising the step of interposing an insulator between the first current collector plate and an inner surface of the bottom of the battery housing.

10. Before step (d), preparing an insulator having a through hole at its center and a shape corresponding to an inner surface of the bottom of the battery housing; attaching the insulator to an inner surface of the bottom of the battery housing so that the through-hole of the insulator surrounds the fixing portion of the electrode terminal; The method of manufacturing the battery of claim 9 further comprising:

11. Before step (d), preparing an insulator having a through hole at its center and a shape corresponding to an inner surface of the bottom of the battery housing; fixing the insulator on the first current collector plate such that a through hole of the insulator is positioned over a core of the electrode assembly; The method of manufacturing the battery of claim 9 further comprising:

12. coupling a second current collecting plate to a second electrode tab of the electrode assembly; coupling at least a portion of the second current collector plate to an inner surface of the battery housing; The method for manufacturing the battery of claim 1 further comprising:

13. pressing an outer circumferential surface of the open end of the battery housing toward the inside of the battery housing to form a beading portion; welding at least a portion of the second current collector plate to the second electrode tab; contacting a predetermined area of an edge of the second current collector plate with an inner surface of the beading portion; The method of claim 12 further comprising:

14. The method of claim 13 , further comprising bending an edge region of the second current collector plate adjacent to the predetermined region so that the predetermined region reaches an inner surface of the beading portion.

15. The method of claim 13 , further comprising welding the predetermined area to an inner surface of the beading portion.

16. interposing a sealing gasket between a periphery of the cap plate and an open end of the battery housing; bending an open end of the battery housing in a centripetal direction to form a crimping portion that fixes the sealing gasket and a periphery of the cap plate to the open end; The method of claim 13 further comprising:

17. The method of claim 16, wherein the crimping portion presses the sealing gasket to closely contact the predetermined area with the inner surface of the beading portion.

18. The method of claim 1 , further comprising forming a venting groove on at least one of both surfaces of the cap plate.

19. Before step (f), raising the battery housing so that a bottom of the battery housing faces the ground; injecting an electrolyte into the battery housing; The method for manufacturing the battery of claim 1 further comprising:

20. After step (f), standing the battery housing upright so that the bottom of the battery housing faces upward; performing electrical wiring using the electrode terminals and an area of the outer surface of the bottom of the battery housing excluding an area where the electrode terminals are exposed; The method for manufacturing the battery of claim 1 further comprising:

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