How the battery is manufactured

Abstract

A method for manufacturing a battery according to the present invention includes the steps of: preparing a battery housing having an open side and a bottom having a through hole on the other side; fixing an electrode terminal in the through hole; preparing an electrode assembly having a first electrode tab consisting of a first uncoated portion and a second electrode tab consisting of a second uncoated portion at an upper and lower part, respectively; inserting the electrode assembly into the battery housing through an open end provided on one side of the battery housing such that the first electrode tab faces the bottom; electrically connecting the first electrode tab and the electrode terminal; and covering and sealing the open end with a cap plate.

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 terminal and a negative 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 to 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 specification and drawings of such 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 parts such as bus bars for electrically connecting multiple cylindrical batteries must be applied to both the upper and lower parts of the cylindrical batteries, which complicates the electrical connection structure of the battery pack.

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

[0006] Therefore, there is a need to develop a cylindrical battery having a structure in which the positive and negative terminals are applied in the same direction so as to simplify the electrical connection structure of a plurality of cylindrical batteries.

[0007] Furthermore, when both the positive and negative terminals are formed at one end in the axial direction, if the internal structure of a cylindrical battery having two terminals is complicated, there are problems in that the manufacturing cost increases and it is difficult to improve the energy density.

[0008] In addition, when both the positive electrode terminal and the negative electrode terminal are provided at one axial end, it is necessary to ensure the areas of both the positive electrode terminal and the negative electrode terminal appropriately in a simple manner.

[0009] In addition, 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] Meanwhile, in the case where a first electrode terminal and a second electrode terminal are provided at one and the other axial ends of a cylindrical battery, respectively, when a battery pack is constructed in an upright state of the cylindrical battery, insulation treatment is required between the bottom surface functioning as the terminals and the bottom of the pack housing, which also results in increased manufacturing costs. Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made in consideration 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 in manufacturing a battery pack to an electrode terminal of a cylindrical battery when attempting to electrically connect a plurality of cylindrical batteries in one direction.

[0013] It is yet another object of the present invention to provide a cylindrical battery in which a positive and negative terminals are all 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 properly secure the areas of the positive and negative terminals at the bottom side of the battery housing, and that has surfaces that facilitate connection of the two terminals with electrical connection parts.

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

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

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

[0018] In order to solve the above problems, the cylindrical battery of the present invention 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 processed before the electrode assembly to be received in the battery housing is inserted, that is, the two electrode terminals provided on the bottom may be processed with a high degree of freedom.

[0020] This allows the bottom portion to be processed into a flat shape through a simple process, and by configuring the outer surface of the bottom portion as a first electrode terminal, electrical connection components for connecting thereto and electrical wiring work can be easily performed.

[0021] Furthermore, by forming a through hole in the bottom portion and fixing an electrode terminal to be the second electrode terminal therein, two electrodes can be formed at 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 electrical connection parts and electrical wiring for connecting thereto can be easily performed.

[0023] The portion of the electrode terminal exposed further outward than the bottom may be extended further outward in the radial direction than the inner circumferential surface of the through hole, and the portion of the electrode terminal extending further outward in the radial direction than the through hole may be processed in advance when the electrode terminal itself is prepared.

[0024] Therefore, the dimension by which the electrode terminal extends radially outward beyond the through hole can be easily and precisely determined. Also, when cylindrical batteries are mass-produced, the variation in the areas of the two electrode terminals provided at the bottom of the battery housing between mass-produced products can be easily minimized.

[0025] According to the present invention, the electrode assembly can be inserted into the battery housing with two electrode terminals already provided at the bottom of the battery housing, so that the electrode assembly can be accommodated as close as possible to or in close contact with the bottom of the battery housing.

[0026] The present invention can easily form an 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 prepared, which structure 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 be polarized.

[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 a bottom of the battery housing through a through hole formed in the bottom of the battery housing, and a cap plate covering and sealing an open end of one side of the battery housing.

[0030] In addition, a cylindrical battery according to another embodiment of the present invention may include: a cylindrical battery housing having an open side and a bottom on the other 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 side wall and bottom of the battery housing may be fabricated as one piece.

[0034] As an 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 a portion of the electrode terminal accommodated inside the battery housing and the first electrode tab.

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

[0039] A 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] An outer diameter of the electrode terminal exposed to the outside of the bottom of the battery housing may be greater than an inner diameter of a 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 terminal may have a portion exposed to the outside of the bottom that covers 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 an outside of the battery housing, and a gasket insertion portion penetrating a bottom of the battery housing.

[0046] The electrode terminal may be rivet-connected onto an inner surface of a bottom of the battery housing.

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

[0048] The cylindrical battery may further include an insulator interposed between the first current collector 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 break 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] In order 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 a through hole on the other side; (b) fixing an electrode terminal in the through hole; (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 on an upper and lower side, respectively; (d) inserting the electrode assembly into the battery housing through an open end provided on one side of the battery housing such that the first electrode tab faces the bottom; (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 to increase a diameter of the periphery of the end to be larger than a diameter of the through hole.

[0056] In the step (b2), the periphery 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 processed periphery of the end portion may press the insulating gasket against an inner surface of the bottom of the battery housing.

[0058] The 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 in an axial direction, and winding the electrode assembly around an axis with a separator interposed between the first electrode and the second electrode to form an electrode assembly having a defined core and an outer circumferential surface; and folding 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 area 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 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 and an inner surface of a 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 a center and a shape corresponding to an inner surface of a 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 in its center and a shape corresponding to an inner surface of a bottom of the battery housing; and fixing the insulator on the first current collecting 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 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 an 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 such 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 bring the predetermined area into close contact with 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 inside of 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 an upper portion, 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. Effect 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, so that the bonding strength between the electrode terminal and the electrical connection part can be sufficiently ensured, and the resistance at the bonding site between the electrical connection part and the electrode terminal can be reduced to a desired level.

[0076] Furthermore, according to an embodiment of the present invention, the electrode terminal and the electrode assembly can be disposed in close contact with each other inside the battery housing, thereby increasing the amount of energy stored per volume, i.e., the energy density.

[0077] In addition, 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 an 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 insulation structure can be easily manufactured, the electrode assembly is closely attached to the bottom side, the battery capacity density per volume can be increased, and the manufacturing and assembly errors of the positive and negative terminals can be minimized. The battery manufactured in this manner can be easily connected by a bus bar or the like in the subsequent process.

[0079] In addition, according to one embodiment of the present invention, a structure can be formed in which the outer circumferential surface of the positive electrode extends further outward than the inner circumferential surface of the negative electrode through-hole at the bottom side of the battery housing, which is manufactured first, regardless of whether the electrode assembly is inserted, and the exposed areas of the positive electrode terminal and the negative electrode terminal can be arbitrarily designed.

[0080] The above-mentioned effects as well as 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 ideas of the present invention. Therefore, the present invention should not be interpreted as being limited to only the matters described in the drawings. [Brief description 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; [Diagram 2] 1 is a cross-sectional view showing an internal structure of a cylindrical battery according to an embodiment of the present invention. [Diagram 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; [Diagram 5] 4 is a diagram showing a coupling structure between a first current collector plate and an electrode assembly applied to the present invention. FIG. [Figure 6] 4 is a diagram showing a coupling structure between a first current collector plate and an electrode assembly applied to the present invention. FIG. [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] FIG. 2 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 collecting plate applied to the present invention. [Figure 10] 1 is a schematic diagram showing a battery pack according to an embodiment of the present invention; [Figure 11] 1 is a schematic diagram of a vehicle according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 to which the present invention pertains can easily implement the technical ideas of the present invention. In the description of the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals refer to the same or similar components.

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

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

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

[0087] In addition, 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 "interposed" between each component, or that each component is "coupled," "coupled," or "connected" through other components.

[0088] In addition, singular expressions used in this specification 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 not include some of the components or steps, and may further include additional components or steps.

[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 the electrode assembly wound into a jelly-roll shape is referred to as the axial direction (Z-axis). Also, the direction surrounding the winding shaft is referred to as the circumferential direction or outer circumferential direction. Also, the directions approaching the winding shaft or 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 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 provided 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 processing of 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 side wall 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 provided in a bottom (top in the drawing) of the battery housing 20. The through hole may be located in an approximate 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 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. As a result, the gap between the electrode terminal 40 and the battery housing 20 is sealed, and the electrode terminal 40 and the battery housing 20 are electrically insulated from each other.

[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 at the bottom have an advantage of high processing flexibility since 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 parts.

[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 for connection thereto becomes easy.

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

[0103] The terminal exposed 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 terminal exposed portion 41 may be machined in advance when preparing the components of the electrode terminal 40. Therefore, the size and shape of the terminal exposed portion 41 of the electrode terminal 40 can be easily and precisely determined.

[0104] In this manner, when mass-producing the cylindrical battery 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 housed in the battery housing 20, so that it is easy to minimize variation between mass-produced products in the areas of the two electrode terminals provided at the bottom of the battery housing 20.

[0105] In the present invention, the electrode assembly 10 can 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. In the present invention, an 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 can be simplified. 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. Thus, 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 collecting plate 60 .

[0110] The second electrode tab 12 may face an open end side of the battery housing 20. The second electrode tab 12 may be electrically connected to the battery housing 20 through an inner surface of the battery housing 20. Thus, 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, so that the structure for sealing the open end of the cylindrical battery housing 20 is simplified as shown in FIG.

[0112] Such sealing can be achieved by the cap plate 30, which has the advantage that it does not have 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 the present embodiment includes a cylindrical battery housing 20 having an open side and a bottom on the other side, an electrode terminal 40 fixed to a 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 received 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 covering and sealing the open end of one side of the battery housing 20 when the electrode assembly 10 is received in the battery housing 20.

[0115] Here, the side wall and the bottom of the battery housing 20 may be processed as one part before accommodating the electrode assembly 10. The side wall and the bottom of the battery housing 20 may be formed as one part before accommodating the electrode assembly 10. That is, this concept includes not only manufacturing as one part from the beginning through a forming process such as drawing of a sheet metal press, but also manufacturing the side wall and the bottom as separate parts and then assembling and integrating them into one part before accommodating the electrode assembly 10. The part forming the side wall 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 idea of ​​the present invention does not exclude the cap plate 30 being electrically connected to the second electrode tab 12. That is, the cap plate 30 may or may not have polarity. However, the present invention means that since two electrode terminals are provided at the bottom of the battery housing 20, the cap plate 30 sealing the open end on the opposite side may not have polarity. Of course, there may be various advantages of the cap plate 30 not having 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. Thus, 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 a 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 in close contact with or joined to the electrode terminal 40, and the other surface of the first current collecting plate 60 is in close contact with or joined to the first electrode tab 11. The joining may be performed by welding. Therefore, resistance to current through the electrode terminal 40 is minimized. Furthermore, such a close contact arrangement structure increases utilization of the internal space of the battery housing 20 to increase 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 penetrating vertically, and the inner peripheral surface of the hole may surround the periphery of the fixed portion of the electrode terminal 40 .

[0123] The portion of the electrode terminal 40 accommodated inside the battery housing 20 faces the insulator 70 in the radial direction, but does not necessarily face the insulator 70 in the axial direction.

[0124] The outer diameter of the electrode terminal 40 exposed to the outside of the bottom may be larger than the inner diameter of the through hole of the bottom of the battery housing 20. In other words, the first cross section of the through hole of the bottom of the battery housing 20 may be included inside the 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 projection area of ​​the first cross section is included in the second cross section. As a result, the part of the electrode terminal 40 exposed to the outside of the bottom may cover at least a part of the bottom of the battery housing 20 in the radial direction. As a result, the surface area of ​​the bottom and the surface area of ​​the electrode terminal 40 can all be appropriately secured.

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

[0126] First, a cylindrical battery housing 20 is prepared, which has one side open 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 closely 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 on the first electrode tab 11 in the axial direction. The first electrode tab 11 may be bent in the radial direction as shown in FIG. 6, and the first current collector 60 may be joined onto the bent first electrode tab 11 by a method such as welding. To facilitate bending of the first electrode tab 11, cut grooves may be formed at regular intervals in the winding direction in the uncoated portion forming the first electrode tab 11. The extension direction of the cut grooves may be 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] Then, the electrode assembly 10 is inserted through an open end provided at an axial end of the battery housing 20 having the electrode terminal 40 fixed to the bottom. At this time, the electrode assembly 10 is inserted such 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 attached in advance 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 collecting plate 60 is joined. An adhesive or adhesive tape may be used to attach the insulator 70. When the insulator 70 is made of a polymer resin having heat shrinkability, the insulator 70 may be fixed to the end of the electrode assembly 10 by applying heat. The insulator 70 may include a sleeve structure extending in the axial direction along the outer circumferential surface of the electrode assembly 10 so as to cover an 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. Thus, 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 and the center portion of the first current collecting plate 60. Since the lower end of the terminal insertion portion 42 of the electrode terminal 40 is flat, it may be welded in a state of tight 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 may be joined to the second electrode tab 12, and an edge of the second current collecting plate 80 may be connected to an 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 the second electrode tab 12, cut grooves may be formed at regular intervals in 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 provided in the center of the second current collecting plate 80. Such a hole may be a passage through which a device for joining the first current collecting plate 60 and the electrode terminal 40 may be inserted or through which a laser beam may pass. That is, before the electrode assembly 10 is inserted into the battery housing 20, the second current collecting plate 80 may be joined to the second electrode tab 12 first. 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] Then, 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 a beading portion 21 is formed before the crimping portion 22 is formed, so that the periphery of the lower end of the electrode assembly 10 inserted inside the battery housing 20 can be supported so that the electrode assembly 10 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 an 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 an inner peripheral 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 an embodiment of the present invention includes an electrode assembly 10, a battery housing 20, a cap plate 30, and an electrode terminal 40. 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 in addition to the above-mentioned components.

[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 electrode and the second electrode. The first electrode is a positive electrode or a negative electrode, and the second electrode is an electrode having a polarity opposite to that of 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 an outer circumferential surface 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 accommodated in the battery housing 20 in a 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 second electrode collector has a second uncoated portion at the other end in the width direction (Z-axis direction) 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 may be used as electrode tabs themselves.

[0148] The first electrode tab 11 and the second electrode tab 12 have a spirally wound structure. The first uncoated portion and the second uncoated portion may have a plurality of cut grooves formed 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 active material coated on the positive electrode plate and the negative active material coated on the negative electrode plate may be any active material known in the art without any limitations.

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

[0151] As another example, the positive electrode active material is an alkali metal compound xLiM disclosed in, for example, U.S. Patent No. 6,677,082 and U.S. Patent No. 6,680,143. 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 such 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] Desirably, the positive electrode active material may include primary particles and / or secondary particles formed by agglomeration of the primary particles.

[0154] In one example, the negative electrode active material may be a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, etc. Metal oxides such as TiO2 and SnO2 having a potential of less than 2 V 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., used alone or in combination. As another example, the separator may be a conventional porous nonwoven fabric, for example, a nonwoven fabric made of a high melting point glass fiber, a polyethylene terephthalate fiber, etc.

[0156] At least one surface of the separation membrane may include a coating layer of inorganic particles. Alternatively, the separation membrane 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 such that there is an interstitial volume between adjacent particles.

[0157] The inorganic particles may be made of an inorganic material having a dielectric constant of 5 or more. As a non-limiting example, the inorganic particles may be made of 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 - In this case, the salt may have the structure: + Li + , Na + , K + or a combination thereof. - 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 includes one or more anions selected from the group consisting of:

[0159] The electrolyte may be dissolved in an organic solvent for use. The organic solvent may be 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 end at a lower portion and is made of a conductive material such as a metal. The material of the battery housing 20 may be, for example, steel, stainless steel, aluminum, etc.

[0161] The side (outer peripheral surface) and the 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 an open end formed below, and also accommodates an electrolyte. The closed end supports the electrode assembly inserted from 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 include a beading portion 21 and a crimping portion 22 formed at a lower end thereof. The beading portion 21 is located under 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 collecting plate 80 are placed.

[0164] The crimping portion 22 is formed under the beading portion 21. The crimping portion 22 is extended and bent to enclose the outer circumferential surface of the cap plate 30 disposed under 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 additionally applying a part that can function as a stopper for the electrode assembly 10 and / or additionally applying a structure on which the cap plate 30 can be placed and / or welding between the battery housing 20 and the cap plate 30, etc.

[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 side wall portion forming the outer circumferential surface 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 an 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 is, the larger the internal space becomes, and thus the energy density is improved, and a cylindrical battery 1 having a large capacity can be manufactured.

[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 is, the more vulnerable it is to corrosion, and the thicker it is, the more difficult the manufacturing process is, or the more likely it is that plating peeling will occur. It is necessary to set an optimal thickness for the battery housing 20 and an optimal thickness for the plating layer by taking all of these conditions into consideration. Furthermore, it is necessary to control the thickness of the bottom and the thickness of the side walls of the battery housing 20 by 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 lower end of the battery housing 20. That is, the cap plate 30 constitutes the lower surface of the cylindrical battery 1. In the cylindrical battery 1 of the present invention, the cap plate 30 does not have polarity even if it is made of a conductive metal material. Not having polarity 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 terminal or a 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 the material thereof 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 is fixed by the crimping portion 22. A sealing gasket 90 may be interposed between the cap plate 30 and the crimping portion 22 of the battery housing 20 to ensure airtightness of the battery housing 20.

[0172] Meanwhile, as described above, the battery housing 20 of the present invention may not include the beading portion 21 and / or the crimping portion 22. In this case, the sealing gasket 90 may be interposed between a fixing structure provided on the open end side of the battery housing 20 and the cap plate 30 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 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 to discharge the gas generated inside the battery housing 20. The venting portion 31 may be formed by, for example, notching one or both sides of the cap plate 30 to partially reduce the thickness of the cap plate 30.

[0174] The cylindrical battery 1 according to an embodiment of the present invention has a structure in which both the positive and negative terminals are present at the upper portion, and therefore the structure of the upper portion is more complicated than that of the lower portion. Therefore, in order to smoothly discharge gas generated inside the battery housing 20, a venting portion 31 may be formed in the cap plate 30 constituting the lower surface of the cylindrical battery 1. As shown in FIG. 7, it is preferable that the lower end of the cap plate 30 is located above 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 surface of a housing for forming a module or pack, the cap plate 30 does not contact the ground or the bottom surface of a housing for forming a module or pack. Therefore, it is possible to prevent a phenomenon in which the pressure required for breaking the venting portion 31 changes from a designed value due to the weight of the cylindrical battery 1, and thus it is possible to ensure smooth breaking of the venting portion 31.

[0175] Meanwhile, when the venting portion 31 has a closed loop shape as shown in Figs. 7 and 8, 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 becomes, making it easier to break, when the same venting pressure is applied. Also, the greater the distance from the center of the cap plate 30 to the venting portion 31, the greater the ease of discharging the venting gas. From this perspective, it is advantageous for the venting portion 31 to be formed along the periphery of a substantially flat region protruding downward (downward with reference to Fig. 7) from the peripheral region of the cap plate 30.

[0176] 8 shows the venting portion 31 being continuously formed on the cap plate 30 while drawing an approximately circular shape, but the present invention is not limited thereto. The venting portion 31 may be discontinuously formed on the cap plate 30 while drawing an approximately circular shape, or may be formed in an approximately 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 to the open end of the battery housing 20 (the 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 a first electrode terminal in the cylindrical battery 1 of the present invention. When the electrode terminal 40 has the first polarity as described above, the electrode terminal 40 is electrically insulated from the battery housing 20 having the second polarity. The electrical insulation between the electrode terminal 40 and the battery housing 20 can be achieved in various ways. For example, the insulation can be achieved by interposing an insulating gasket 50 between the electrode terminal 40 and the battery housing 20. Alternatively, the insulation can be achieved by forming an insulating coating layer on a part of the electrode terminal 40. Alternatively, a method may be applied in which the electrode terminal 40 is structurally and firmly fixed so that the electrode terminal 40 cannot come into contact with the battery housing 20. Alternatively, a combination of a plurality 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 at an approximately central portion 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 a through hole formed in the battery housing 20. The terminal inserting portion 42 may be electrically connected to the first electrode tab 11 by penetrating an approximately central portion of the upper surface of the battery housing 20. The peripheral region of the 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. The plastic processing refers to a method of deforming the lower end of the electrode terminal 40 by applying pressure with a jig. The peripheral region of the end of the terminal inserting portion 42 increases in diameter while expanding in the radial direction due to the plastic processing. The jig has a structure corresponding to the final shape of the terminal inserting portion 42. The plastic processing is a metal processing technique using the softness and malleability of metal. The plastic processing may be caulking. Pressurization using a jig during the plastic processing may be performed multiple times. The portion bent toward the inner surface of the terminal insertion portion 42 may crimp an insulating gasket 50 toward the inner surface, thereby providing airtightness between the electrode terminal 40 and the battery housing 20. Since the peripheral region of the end of the terminal insertion portion 42 has a shape bent toward the inner surface of the battery housing 20, the maximum width of the end of the terminal insertion portion 42 is larger than the maximum width of the through hole of the battery housing 20.

[0179] Meanwhile, when the cylindrical battery 1 of the present invention includes the 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 about 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 may 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 draws a substantially concentric circle with a bottom surface of a 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 weld line may have a diameter of about 60% to 80% of the diameter of the bottom surface of the central region of the terminal insertion portion 42. For example, when the diameter of the bottom surface of the central region of the terminal insertion portion 42 is about 6.2 mm, the diameter of the circle drawn by the weld line is preferably about 4.0 mm or more. If the diameter of the circle drawn by the weld line is too small, the bonding strength by welding may be insufficient. On the other hand, if the diameter of the circle drawn by the weld line is too large, the electrode assembly 10 may be damaged by heat and / or welding spatters.

[0183] The ultrasonic welding may be performed by inserting a welding rod for ultrasonic welding through a hollow portion formed at the winding center C of the electrode assembly 10. The welded portion formed by the ultrasonic welding is formed in 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 welded portion formed by the ultrasonic welding may be formed entirely in a concentric circle having a diameter of about 30% to 80% of the bottom surface of the central region of the terminal insertion portion 42. For example, when the diameter of the bottom surface of the central region of the terminal insertion portion 42 is about 6.2 mm, the diameter of the circle formed by the ultrasonic welding may be preferably about 2.0 mm or more. If the diameter of the circle formed by the ultrasonic welding is too small, the bonding force by the welding 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 an embodiment of the present invention, the upper surface of the battery housing 20 and the electrode terminal 40 exposed to the outside of the battery housing 20 have opposite polarities 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, when the entire upper surface of the battery housing 20 has a flat shape or a shape that protrudes upward at its center, the terminal exposure portion 41 of the electrode terminal 40 may protrude further upward than the upper surface of the battery housing 20. On the other hand, when 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 exposure 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 concave portion 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 a 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 exposing portion 51 of the insulating gasket 50 may be extended to cover the outer circumferential surface of the terminal exposing 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 coupling an electrical connection component, 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 thereof.

[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 fusion.

[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 has a shape extending 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 insulation 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 insulation gasket 50 and the thickness of the insulator 70 may be the same, but are not necessarily limited to this. When these thicknesses are different, the insulator 70 may be thinner than the insulation gasket 50, and vice versa.

[0195] On the upper surface of the battery housing 20, the entire area excluding the area occupied by the electrode terminal 40 and the insulating gasket 50 corresponds to a second electrode terminal 20a having an opposite polarity to the electrode terminal 40. On the other hand, in the present invention, when the insulating gasket 50 is omitted and an insulating coating layer is partially provided on the electrode terminal 40, the entire area excluding the area occupied by the electrode terminal 40 having the insulating coating layer on the upper surface of the battery housing 20 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 an upper portion 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 projections and recesses formed radially on a lower surface thereof. When the projections and recesses are formed, the first current collecting plate 60 may be pressed against the projections and recesses to press the first electrode tab 11 into the projections 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 to each other by, for example, laser welding. The laser welding may be performed by partially melting a base material of the first current collecting plate 60, and may be performed with solder for welding 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, a direction toward a 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 laminated 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 the energy density. In addition, the increased coupling area between the first electrode tab 11 and the first current collecting plate 60 can improve the coupling force and reduce the 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 portion 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 between 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 circumferential surface of the electrode assembly 10 and the inner surface of the battery housing 20. The first current collecting plate 60 may be a plate extending 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) the insulator 70 to be coupled with 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 an embodiment of the present invention, the terminal insertion portion 42 may have a circular planar shape, but is not limited thereto. The terminal insertion portion 42 may alternatively have a polygonal shape, a star shape, a shape with legs extending from the center, and the like.

[0204] 2 and 7, the second current collecting plate 80 is coupled to a lower portion 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. In addition, the second current collecting plate 80 is electrically connected to the battery housing 20. The second current collecting plate 80 may be interposed and fixed between an 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 second electrode tab 12 to press 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 to each other by, for example, laser welding. The laser welding may be performed by partially melting a base material of the second current collecting plate 80, and may be performed with solder for welding interposed between the second current collecting plate 80 and the second electrode tab 12.

[0208] In this case, it is desirable for the solder to have 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 collecting 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 collecting plate 80. The bending direction of the second electrode tab 12 may be, for example, a direction toward the winding center C of the electrode assembly 10. When the second electrode tab 12 is bent, the uncoated portion forming the second electrode tab 12 may form a folded surface region. The folded surface region has a structure in which the uncoated portions are laminated 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 the energy density. In addition, the increased coupling area between the second electrode tab 12 and the second current collecting plate 80 can improve the coupling force and reduce the 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 be in contact with 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 each other. 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 portion 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 may be similarly applied to the first current collecting plate 60 described above.

[0213] 3 and 7, the 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 (the first electrode terminal 40 and the second electrode terminal 20a) are positioned in the same direction, so that when a plurality of cylindrical batteries 1 are electrically connected, electrical connection parts 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] In addition, the cylindrical battery 1 has a structure in which one surface of the battery housing 20 having 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 the resistance at the bonding site can be reduced to a desired 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. In order to ensure a sufficient area for coupling the bus bar B in each of the first electrode terminal 40 and the second electrode terminal 20a, a width D1 of an upper surface of a region of the first electrode terminal 40 exposed to the outside of the battery housing 20, i.e., a terminal exposed portion 41, may be set to about 10% to 60% of a width D2 of the second electrode terminal 20a, i.e., a width of 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 divided by the height of a cylindrical battery, i.e., the ratio of height (H) to diameter (Φ)) greater than about 0.4.

[0217] Here, the 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 value indicating the form factor, 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 about 0.4 or less have been used. That is, conventionally, for example, 1865 batteries, 2170 batteries, etc. have been used. In the case of an 1865 battery, the diameter is about 18 mm, the height is about 65 mm, and the form factor ratio is 0.277. In the case of a 2170 battery, the diameter is about 21 mm, the height is about 70 mm, and the form factor ratio is 0.300.

[0224] 10, a battery pack 3 according to an embodiment of the present invention includes a battery assembly in which a plurality of cylindrical batteries 1 according to an embodiment of the present invention as described above are electrically connected, and a pack housing 2 that accommodates the battery assembly. For convenience of illustration, components such as a bus bar for electrical connection, a cooling unit, and a power terminal 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 represented by the appended claims rather than the above detailed description. The meaning and scope of the claims, as well as all modifications and variations derived from the equivalent concept, are to be interpreted as being included in the scope of the present invention.

[0227] Although the present invention has been described 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 effects of the configuration 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 configuration should also be recognized.

[0228] 5. Automobiles 10 Electrode assembly 11 First electrode tab 12 2nd 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 Insulating gasket 51 Exposed gasket 52 Gasket insert 60 First current collector 70 Insulators 80 Second current collector 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 part, respectively; (d) inserting the electrode assembly into the battery housing through an open end provided on one side of the battery housing such that the first electrode tab faces the bottom; (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: The manufacturing method includes: coupling a second current collecting plate to a second electrode tab of the electrode assembly; coupling a predetermined area of ​​the second current collecting plate to an inner surface of the battery housing; Including, a second current collector plate having an edge region adjacent to the predetermined region being bent so that the predetermined region reaches an inner surface of the second current collector plate;

2. the electrode terminal includes a terminal insertion portion that is inserted into the battery housing through the through hole, The step (b) comprises: (b1) interposing an insulating gasket between the electrode terminal and the through hole; (b2) performing radial plastic working on a periphery of an end portion of the terminal insertion portion to increase a diameter of the periphery of the end portion to be larger than a diameter of the through hole; A method for making 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 an axial direction of the electrode assembly using a jig having a structure corresponding to a final shape of the plastic working.

4. The method for manufacturing a battery according to claim 2, wherein in step (b2), the plastically processed periphery of the end presses the insulating gasket against an inner surface of the bottom of the battery housing.

5. The step (c) comprises: preparing a first electrode having a first uncoated portion at a long side end and a second electrode having a second uncoated portion at a long side end; forming a plurality of cut 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 in an axial direction, and winding the first electrode and the second electrode around an axis with a separator interposed therebetween 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 multiply stacked along the axial direction by folding the first uncoated portion and the second uncoated portion along a radial direction of the electrode assembly; A method for making the battery of claim 1 comprising:

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

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

8. 8. The method of claim 7, wherein step (e) comprises irradiating a welding laser toward a welding area of ​​the first current collector plate facing the electrode terminal through a hollow portion in 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. Prior to step (d), preparing an insulator having a shape corresponding to an inner surface of a bottom of the battery housing, the insulator having a through hole at a center thereof; attaching the insulator to an inner surface of a bottom of the battery housing such that a through hole of the insulator surrounds a fixing portion of the electrode terminal; The method of claim 9 further comprising:

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

12. pressing an outer circumferential surface of an open end of the battery housing toward an 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 with an inner surface of the beading portion; The method of claim 1 further comprising:

13. The method of claim 12, further comprising welding the predetermined area to an inner surface of the beading portion.

14. 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 a periphery of the cap plate to the open end together with the sealing gasket; The method of claim 12 further comprising:

15. The method of claim 14, wherein the crimping portion presses the sealing gasket to closely contact the predetermined area with the inner surface of the beading portion.

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

17. Prior to step (f), standing the battery housing upright so that a bottom of the battery housing faces the ground; injecting an electrolyte into the battery housing; The method of claim 1 further comprising:

18. After step (f), standing the battery housing up so that a bottom of the battery housing faces an upper part; performing electrical wiring using the electrode terminals and a region of an outer surface of a bottom of the battery housing other than a region where the electrode terminals are exposed; The method of claim 1 further comprising:

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