Secondary battery and method for manufacturing secondary battery

Abstract

A secondary battery according to one embodiment comprises: an electrode assembly comprising a plurality of electrodes, an electrode tab extending from at least one of the plurality of electrodes, and a separator interposed between the plurality of electrodes; an electrode lead electrically connected to the electrode tab; and an insulating member including a first surface facing the electrode lead and a second surface opposite to the first surface, and disposed between the plurality of electrodes and the electrode lead, wherein the insulating member includes an opening configured to allow at least a portion of the electrode tab to pass between the first surface and the second surface, thereby increasing space utilization of a battery case and increasing energy density of a battery cell accommodated in the battery case. Other embodiments are possible.

Description

Secondary battery and secondary battery manufacturing method

[0001] This application claims the benefit of priority based on Korean Patent Application No. 2024-0139498 dated October 14, 2024, and all contents disclosed in the document of said Korean Patent Application are incorporated herein as part of this specification.

[0002] The present invention relates to a secondary battery and a method for manufacturing a secondary battery, and more specifically, to a technology for manufacturing a secondary battery capable of increasing the space utilization of a battery case and increasing the energy density of a battery cell housed within the battery case.

[0003] A secondary battery refers to a battery capable of being charged and discharged. Generally, types of secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, and lithium-ion polymer batteries. These secondary batteries are used not only in small products such as digital cameras, P-DVDs, MP3 players, mobile phones, PDAs, portable game devices, power tools, and E-bikes, but also in large products requiring high output such as electric vehicles and hybrid vehicles, as well as in power storage devices and backup power storage devices that store surplus generated power or renewable energy.

[0004] To manufacture such a secondary battery, first, an electrode active material slurry is applied to a positive electrode current collector and a negative electrode current collector to produce a positive electrode and a negative electrode, and then an electrode assembly of a predetermined shape can be formed by stacking them on both sides of a separator. Then, a process of housing the electrode assembly in a case, injecting an electrolyte, and sealing can be carried out.

[0005] Meanwhile, in the case of conventional secondary batteries, after a primary welding process is performed on an electrode tab extending from an electrode (e.g., positive electrode, negative electrode), a secondary welding process is performed to connect the electrode tab to an electrode lead that serves as a terminal of the secondary battery, and in particular, a certain gap is required between the area welded by the primary welding process and the area welded by the secondary welding process.

[0006] Accordingly, there were limitations in maximizing energy density by simplifying the manufacturing process of secondary batteries or reducing their size.

[0007] The present invention aims to provide a secondary battery and a method for manufacturing a secondary battery that can increase the space utilization of a battery case and increase the energy density of a battery cell housed within the battery case by using an integrated lead member.

[0008] The technical problems to be solved by the embodiments of the present invention are not limited to those described above, and other technical problems can be inferred from the following embodiments.

[0009] A secondary battery according to one embodiment of the present invention comprises an electrode assembly including a plurality of electrodes, an electrode tab extending from at least one of the plurality of electrodes, and a separator interposed between the plurality of electrodes, an electrode lead electrically connected to the electrode tab, and an insulating member disposed between the plurality of electrodes and the electrode lead, the insulating member comprising a first surface facing the electrode lead and a second surface opposite to the first surface, wherein the insulating member may include an opening configured to allow at least a portion of the electrode tab to pass between the first surface and the second surface.

[0010] Additionally, the secondary battery further includes a battery case that accommodates the electrode assembly and has a sealing portion formed at the edge, and the electrode lead may include a first portion protruding outward from the battery case, a second portion positioned perpendicularly to the first portion on the inner side of the battery case, and a third portion overlapping with the sealing portion of the battery case.

[0011] In addition, the second part includes an area that overlaps with the electrode tab, and the area that overlaps the second part and the electrode tab can be joined together by a single welding operation.

[0012] Additionally, the area where the second part and the electrode tab overlap can be bent at a position corresponding to the opening of the insulating member after the welding operation and positioned in a direction perpendicular to the first part.

[0013] In addition, the insulating member may be arranged in a direction perpendicular to the first part and combined with one side of the second part to form an integrated lead member.

[0014] In addition, the insulating member may have a size and shape corresponding to the cross-section of the electrode assembly.

[0015] Additionally, the secondary battery further includes a battery case that accommodates the electrode assembly and has a sealing portion formed at the edge, and the insulating member, the electrode tab, and a portion of the electrode lead welded to the electrode tab may be located inside the battery case, and another portion of the electrode lead may be disposed outside the battery case.

[0016] Additionally, the insulating member includes a groove in which the electrode lead is at least partially received, and at least a portion of the electrode tab may be electrically coupled to the electrode lead at a position corresponding to the groove.

[0017] In addition, the depth of the groove may be greater than the thickness of the electrode lead.

[0018] In addition, the thickness of the electrode lead may be smaller than the thickness of the insulating member.

[0019] A method for manufacturing a secondary battery according to one embodiment of the present invention may include the steps of: forming an integrated lead member by combining an electrode lead and an insulating member; positioning an electrode tab of an electrode assembly to pass through an opening formed on one side of the insulating member; welding the integrated lead member to the electrode tab of an electrode assembly; bending a portion of the electrode tab to rotate the integrated lead member welded to the electrode tab by 90 degrees; and placing the electrode assembly inside a battery case and sealing the edge of the battery case.

[0020] Additionally, the insulating member includes a first surface to which the electrode lead is joined and a second surface opposite to the first surface, and the welding step may include welding the portion where the electrode tab passing through the opening and the integral lead member overlap on the first surface.

[0021] Additionally, the step of rotating the integrated lead member welded to the electrode tab by 90 degrees may include bending the electrode tab based on an opening that accommodates the electrode tab, and rotating the integrated lead member welded to the electrode tab by 90 degrees in the direction of the electrode assembly.

[0022] Additionally, the sealing step may include a step of sealing the edge of the battery case with a portion of the integrated lead member protruding to the outside of the battery case.

[0023] According to the present invention, by using an integrated lead utilizing an insulating member to prevent electrical short circuits with electrodes and an L-shaped conductive member, the space utilization of the battery case can be increased and the energy density of the battery cell housed within the battery case can be increased.

[0024] In addition, according to the present invention, through an integrated lead including an insulating member, the shape of the battery case can be maintained against external shock, and the venting of gas generated from the electrode assembly toward the electrode lead can be suppressed.

[0025] In addition, according to the present invention, the electrode tab is prevented from coming into contact with the battery case, thereby minimizing damage to the battery case and preventing an internal short circuit of the secondary battery.

[0026] In addition, according to the present invention, the manufacturing cost of a secondary battery can be reduced by simplifying the process of the secondary battery.

[0027] The effects of the invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description in the claims.

[0028] FIG. 1 is a schematic perspective view illustrating a secondary battery according to one embodiment of the present invention.

[0029] Figure 2 is a schematic cross-sectional view of the case where it is cut along line II of Figure 1.

[0030] FIGS. 3 to 6 are illustrative diagrams of various embodiments shown by enlarging the area (A) indicated by the dotted circle in FIG. 2.

[0031] FIG. 7 is a schematic perspective view showing an enlarged view of the electrode tab end, electrode lead, and insulating member of the secondary battery shown in FIG. 2.

[0032] FIG. 8 is a schematic cross-sectional view of a secondary battery according to one embodiment of the present disclosure.

[0033] FIG. 9 is a flowchart illustrating a method for manufacturing a secondary battery according to one embodiment of the present invention.

[0034] FIGS. 10 to 13 are drawings sequentially illustrating the manufacturing process of a secondary battery according to one embodiment of the present invention.

[0035] The terms used in the embodiments have been selected to be as widely used as possible, taking into account their functions in the present disclosure; however, these may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the relevant explanatory section. Therefore, terms used in the present disclosure should be defined not merely by their names, but based on their meanings and the overall content of the present disclosure.

[0036] When a part of a specification is described as "comprising" a certain component, this implies that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "~part" or "~module" as used in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware or software, or as a combination of hardware and software.

[0037] The expression "at least one of a, b, and c" described throughout the specification may include 'a alone', 'b alone', 'c alone', 'a and b', 'a and c', 'b and c', or 'a, b, and c all'.

[0038] Embodiments of the present disclosure are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein.

[0039] Hereinafter, embodiments of the present disclosure relating to a secondary battery and a method for manufacturing a secondary battery will be described in detail with reference to the drawings.

[0040] FIG. 1 is a schematic perspective view illustrating a secondary battery according to one embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line II of FIG. 1. FIG. 3 to 6 are illustrative diagrams of various embodiments shown by enlarging the area (A) indicated by the dotted circle in FIG. 2.

[0041] Referring to FIGS. 1 and 2, a secondary battery (100) according to one embodiment of the present invention may include an electrode assembly (110), an electrode tab end (120) composed of a plurality of electrode tabs (112), an electrode lead (130), an insulating member (140), and a battery case (150) that accommodates the electrode assembly (110).

[0042] A battery case (150) according to one embodiment of the present invention may be formed by combining an upper case (150a) having an upper cup portion and a lower case (150b) having a lower cup portion. At this time, the upper cup portion and the lower cup portion within the battery case (150) may be arranged to face each other. For example, the cup portions included in the upper and lower cases (150a, 150b) may be formed by molding a pouch sheet.

[0043] The pouch sheet may be a laminated sheet in which layers of different materials are laminated. For example, the pouch sheet may have a multilayer structure in which a lower resin layer made of an insulating material such as polyethylene terephthalate (PET) or nylon, a metal layer made of aluminum that maintains mechanical strength and prevents the penetration of moisture and oxygen, and an upper resin layer made of a polyolefin-based material that has heat-sealability and acts as a sealing material are laminated.

[0044] The battery case (150) may include a receiving portion (156, 158), a joining portion (152), and a sealing portion (154).

[0045] In an embodiment, the receiving portion (156, 158) can accommodate an electrode assembly (110), an electrode tab end (120), an electrode lead (130), and an insulating member (140).

[0046] For example, the receiving portion (156, 158) may be divided into an electrode assembly receiving portion (156) and an electrode connecting portion (158), as illustrated in FIG. 2. The electrode assembly receiving portion (156) may accommodate an electrode assembly (110) and an electrolyte. The electrode connecting portion (158) may accommodate various components for connecting the electrode assembly (110) and an external circuit. For example, the electrode connecting portion (158) may be referred to as a 'terrace'.

[0047] For example, the electrode connection portion (158) can accommodate the electrode tab end (120), electrode lead (130), and insulating member (140), which will be described in detail below.

[0048] Meanwhile, the secondary battery (100) may have varying spatial efficiency within the electrode connection portion (158) depending on how the electrode tab end (120), electrode lead (130), and insulating member (140) accommodated within the electrode connection portion (158) are arranged. For example, if the width of the electrode connection portion (158) is reduced overall and spatial efficiency is increased, the energy density can be increased.

[0049] The receiving portion (156, 158) can be formed by arranging the upper cup portion of the upper case (150a) and the lower cup portion of the lower case (150b) so as to face each other. That is, the receiving portion (156, 158) may correspond to an internal space formed by the space between the upper cup portion and the lower cup portion.

[0050] The joint (152) may be an edge where the upper case (150a) and the lower case (150b) meet to form a battery case (150). For example, the edge may correspond to a flat portion extending outside the cup portions of the upper case (150a) and the lower case (150b).

[0051] For example, the battery case (150) can be formed by arranging the upper case (150a) and the lower case (150b) so as to face each other, and then joining the joint (152), which is the edge where the upper case (150a) and the lower case (150b) meet, to seal the space between the upper case (150a) and the lower case (150b).

[0052] In the embodiment, the joining method of the joint (152) may be a heat fusion method, but is not limited thereto and any other method may be used.

[0053] The sealing portion (154) is a portion that overlaps with a portion of the electrode lead (130) located between the inner and outer sides of the battery case (150), and can be sealed together with a portion of the electrode lead (130) in the first sealing area (300). The sealing portion (154) may be an edge portion protruding in one direction from the upper and lower cases (150a, 150b). At this time, the sealing portion (154) may be formed flat, forming a plane with the joint portion (152). The sealing portion (154) can protect the electrode assembly (110) inside the battery case (150) while sealing a portion of the electrode lead (130) together with the upper case (150a) and the lower case (150b). Additionally, the sealing portion (154) can prevent leakage of a substance such as an electrolyte or gas inside the secondary battery (100) to the outside.

[0054] The sealing method of the sealing part (154) may use a heat fusion method, but is not limited thereto and any other method may be applied.

[0055] In this way, the battery case (150) accommodates components such as an electrode assembly (110), an electrode tab end (120), an electrode lead (130), and an insulating member (140) through a receiving portion (156, 158) formed by an upper cup portion and a lower cup portion, and can be completed by sealing by a joining portion (152) and a sealing portion (154).

[0056] An electrode assembly (110) according to one embodiment of the present invention may be formed into a roughly rectangular flat plate structure.

[0057] In an embodiment, the electrode assembly (110) may include a plurality of electrodes, a separator interposed between the plurality of electrodes, and an electrode tab (112) extending from at least one of the plurality of electrodes. In this case, the plurality of electrodes may include a positive electrode and a negative electrode.

[0058] For example, the electrode assembly (110) may include a plate-shaped laminated portion in which two or more structures having a separator interposed between an anode and a cathode are repeatedly stacked, and electrode tabs (112) formed on the anode and cathode current collectors may protrude from a relatively narrow surface of the electrode assembly (110). A plurality of protruding electrode tabs (112) of the same polarity may each form a cluster, and each plurality of electrode tabs (112) may be electrically connected to an electrode lead (130).

[0059] A plurality of electrodes may include a positive electrode and a negative electrode. For example, the positive electrode may be an electrode in which a positive active material, such as lithium cobalt oxide (LiCoO2), is coated on an aluminum current collector, and the negative electrode may be an electrode in which a negative active material, such as graphite or silicon, is coated on a copper current collector.

[0060] A separator can be interposed between multiple electrodes to prevent electrical short circuits between the electrodes. The separator can be made of an insulating material to electrically insulate the anode and the cathode. For example, the separator can be formed from a polyolefin-based resin film, such as polyethylene or polypropylene, which has microporous properties.

[0061] Meanwhile, the electrode assembly (110) can be formed in various shapes. For example, the electrode assembly (110) can be formed in a jelly roll shape by winding the positive electrode, the negative electrode, and the separator interposed between them. As another example, the electrode assembly (110) can be formed in a stack shape by stacking the positive electrode, the negative electrode, and the separator between them.

[0062] The electrode tab (112) is a conductive member extending from the electrode and is connected to the electrode lead (130) to transmit the current flowing through the electrode to an external circuit.

[0063] The electrode tabs (112) can be drawn out in multiple numbers from the electrode assembly (110), and the multiple electrode tabs (112) can form an electrode tab end (120) by welding them together. At this time, the electrode tab end (120) can be formed by a cluster of multiple electrode tabs (112) of the same polarity. For example, a specific electrode tab end (120) may be composed of multiple electrode tabs (112) that extend from multiple electrodes of the same polarity and protrude to one side of the electrode assembly (110).

[0064] Meanwhile, a secondary battery (100) according to various embodiments of the present invention may have a unidirectional structure in which a plurality of electrode tabs (112) extend from one side of an electrode assembly (110), or a bidirectional structure in which a plurality of electrode tabs (112) extend from both sides of an electrode assembly (110).

[0065] The electrode tab end (120) may be composed of a bundle of multiple electrode tabs (112) extending from multiple electrodes. The electrode tab end (120) may include a positive tab end and a negative tab end depending on the polarity of the electrodes. In this case, the positive tab end refers to a cluster of multiple positive tabs extending from multiple positive electrodes, and the negative tab end refers to a cluster of multiple negative tabs extending from multiple negative electrodes. In this case, for example, the positive tab may be made of a material such as aluminum, and the negative tab may be made of a material such as copper.

[0066] In one embodiment of the present invention, the electrode tab end (120) may be divided into a first region (120a), a second region (120b), and a third region (120c) based on the point where the electrode tab end (120) is bent.

[0067] The first region (120a) may correspond to a portion directly connected to the electrode tab (112) of the electrode assembly (110). For example, the first region (120a) may correspond to a portion where a plurality of electrode tabs (112) extending from a plurality of electrodes form a cluster to form an end. Meanwhile, a portion of the first region (120a) may be positioned to pass through an opening (142) of an insulating member (140) described later.

[0068] The second region (120b) may correspond to a portion that is bent at the opening (142) of the insulating member (140). For example, the second region (120b) may correspond to a reference point where the electrode tab end (120) is bent at a 90-degree angle toward the electrode assembly (110). In an embodiment, the second region (120b) may correspond to a region that exists to increase energy density by increasing the space utilization of the electrode connection portion (158) within the battery case (150).

[0069] The third region (120c) may correspond to a portion of the electrode tab end (120) that is bent relative to the second region (120b) and parallel to one side of the electrode assembly (110) (e.g., the yz plane). For example, the third region (120c) may be combined with a portion of the electrode lead (130) to provide an electrical connection with an external circuit. In this case, the third region (120c) and the portion of the electrode lead (130) may be joined by welding. However, this is not limited thereto, and the electrode tab end (120) and the electrode lead (130) may be joined by any other method.

[0070] An electrode lead (130) according to one embodiment of the present invention can be combined with an electrode tab (112) inside a secondary battery (100) to provide an electrical connection with an external circuit.

[0071] For example, the electrode lead (130) can be joined to the electrode tab (112) by at least one welding process to provide an electrical connection with an external circuit. For example, after a plurality of electrode tabs (112) form an electrode tab end (120) through mutual welding (e.g., primary welding), the electrode lead (130) can be joined to the electrode tab end (120) composed of the plurality of electrode tabs (112) (e.g., secondary welding). As another example, the electrode lead (130) can be joined to the plurality of electrode tabs (112) (e.g., secondary welding) without forming the electrode tab end (120) (e.g., primary welding) to provide an electrical connection with an external circuit. However, the method of mutual joining is not limited to welding, and the electrode lead (130) can be joined to the electrode tab (112) or the electrode tab end (120) by any other method.

[0072] In one example, if the electrode lead (130) and the electrode tab (112) are joined by only one welding step, the effect of reducing manufacturing time and cost through process simplification can be achieved. In another example, if the electrode lead (130) and the electrode tab (112) are joined by two or more welding steps, the electrode lead (130) and the electrode tab (112) are joined more firmly, thereby achieving a stable electrical connection.

[0073] The electrode lead (130) may include an anode lead and a cathode lead. For example, the anode lead may be connected to a plurality of anode tabs extending from a plurality of anodes, and the cathode lead may be connected to a plurality of cathode tabs extending from a plurality of cathodes. For example, the electrode lead (130) may be directly connected to the ends of the anode tabs or cathode tabs.

[0074] For example, the positive lead and the negative lead may be made of metal in the form of thin plates. For example, the positive lead may be made of aluminum and the negative lead may be made of copper. However, it is not limited thereto.

[0075] In one embodiment of the present invention, the positive lead and the negative lead may be arranged side by side in the same direction. However, the configuration of the present invention is not limited thereto, and the positive lead and the negative lead may be arranged to face in opposite directions.

[0076] In one embodiment of the present invention, the electrode lead (130) may have an L-shape. By having the electrode lead (130), which is connected to the electrode tab end (120), in a bent L-shape rather than an I-shape, the proportion of the electrode tab-lead member within the battery case (150) can be reduced. Additionally, since a bending process, such as separately bending the electrode lead (130), is not required, the yield in the manufacturing process can be increased. Thus, the L-shape of the electrode lead (130) may be a desirable shape for increasing the space utilization of the battery case (150). However, since this is merely an example, the electrode lead (130) may have any other shape that can increase the space utilization within the battery case (150).

[0077] In an embodiment, the electrode lead (130) may be divided into a first part (130a), a second part (130b), and a third part (130c).

[0078] The first part (130a) may correspond to a part protruding outward from the battery case (150). For example, the first part (130a) of the electrode lead (130) may be located outside the secondary battery (100) case (150) to provide a connection between each electrode constituting the secondary battery (100) and an external circuit (e.g., PCB).

[0079] The second part (130b) corresponds to a portion positioned perpendicularly to the first part (130a) on the inner side of the battery case (150). For example, the second part (130b) may correspond to a portion that is joined to one side (e.g., the first side) of the insulating member (140) inside the battery case (150). The second part (130b) may be joined within an area that overlaps with the third area (120c) of the electrode tab end (120). At this time, the overlapping area may be joined by welding to a welding area (200).

[0080] Thus, in the embodiment, the electrode lead (130) includes a second portion (130b) that is positioned substantially parallel to the end surface (e.g., yz plane) of the electrode assembly (110), and as the electrode tab end (120) is joined at the second portion (130b), the length of the secondary battery (100) in one direction (e.g., x direction) can be reduced by maximizing space utilization. This allows for the provision of a secondary battery (100) with improved energy density.

[0081] The third part (130c) may correspond to a portion that overlaps with the sealing portion (154) of the battery case (150). The third part (130c) may be combined with and sealed to the sealing portion (154) in the area overlapping with the sealing portion (154). At this time, the area overlapping with the sealing portion (154) may be sealed to the first sealing area (300) by means such as welding. By sealing the electrode lead (130) with the sealing portion (154), the electrolyte may be prevented from leaking out, and external air may be blocked from entering the battery case (150). Additionally, the sealing portion (154) provides electrical insulation to prevent electrical contact between the electrode lead (130) and the electrode assembly (110) and the external environment, and structurally maintains the airtightness of the battery case (150), thereby increasing the stability of the secondary battery (100).

[0082] Meanwhile, in the embodiment, the height from the bottom surface of the lower case (150b) to the third part (130c) can be configured to correspond to the height from the bottom surface of the lower case (150b) to the sealing part (154) so ​​that the third part (130c) of the electrode lead (130) can be accommodated between the sealing part (154) of the upper and lower cases (150a, 150b).

[0083] An insulating member (140) according to one embodiment of the present invention is disposed between an electrode assembly (110) and an electrode lead (130) to prevent an electrical short circuit. For example, the insulating member (140) can prevent an internal short circuit that may occur in the welded portion by contacting the electrode tab end (120) and the electrode lead (130).

[0084] The insulating member (140) may be a plastic structure having electrical insulation properties. For example, the insulating member (140) may be an insulating plastic made of polypropylene (PP), polyethylene (PE), polyimide, or ceramic.

[0085] The insulating member (140) can be integral with the L-shaped electrode lead (130). For example, the insulating member (140) can be positioned perpendicular to the first part (130a) of the electrode lead (130). This insulating member (140) can be pre-bonded to one side of the second part (130b) of the electrode lead (130) in various ways (e.g., bonding by adhesive tape, mechanical bonding, welding bonding, etc.) to form an integral lead member. For example, the integral lead member can be bonded to the electrode tab end (120) in an area where the second part (130b) of the electrode lead (130) and the third region (120c) of the electrode tab end (120) overlap. The mutually coupled electrode tab end (120) and the integrated lead member can be folded at a second region (120b) of the electrode tab end (120) and placed in the electrode connection portion (158) of the battery case (150) so that one side (e.g., the second side) of the insulating member (140) is parallel to the electrode assembly (110) (see FIG. 11 and FIG. 12).

[0086] The insulating member (140) may include an opening (142) capable of receiving an electrode tab end (120). For example, the opening (142) of the insulating member (140) may receive a first region (120a) of the electrode tab end (120). At this time, the opening (142) of the insulating member (140) may be formed at one end of the insulating member (140). As the mutually coupled electrode tab end (120) and the integrated lead member are bent 90 degrees in a direction approaching the electrode assembly (110) at the second region (120b) of the electrode tab end (120) (e.g., clockwise with respect to FIG. 11), the first region (120a) of the electrode tab end (120) may engage with the opening (142). As a result, the first region (120a) of the electrode tab end (120) is surrounded by the opening (142), so that a certain distance can be maintained between the electrode tab end (120) and the battery case (150), and an electrical short circuit between them can be prevented.

[0087] Meanwhile, in various embodiments, the insulating member (140) may include a groove (not shown) capable of receiving an electrode lead (130).

[0088] For example, the insulating member (140) may include a groove designed so that a second portion (130b) of an electrode lead (130) coupled to the insulating member (140) does not protrude outside one side (e.g., the first side) of the insulating member (140).

[0089] For example, as illustrated in FIGS. 4 and 5, as the second part (130b) of the electrode lead (130) is received in the groove of the insulating member (140), the step difference between the second part (130b) of the electrode lead (130) and the insulating member (140) may be eliminated or reduced. As a result, the size of the integrated lead member formed by combining the electrode lead (130) and the insulating member (140) (e.g., the length in the x-axis direction of FIG. 2) is reduced, and the space utilization inside the battery cell may be increased.

[0090] At this time, the shape of the groove portion according to various embodiments can be designed to correspond to the shape of the electrode lead (130).

[0091] For example, the groove may be positioned adjacent to the opening (142) of the insulating member (140), so that the electrode tab end (120), which is bent at a position corresponding to the opening (142), is coupled with the electrode lead (130) received in the groove. For example, the groove receiving the electrode lead (130) may be connected to the opening (142) receiving the electrode tab end (120), or may be configured as a separate groove to form a vertical relationship with each other. However, this is merely an example, and the electrode lead (130) may be inserted into the insulating member (140) in any other way to be manufactured as an integrated lead member.

[0092] Meanwhile, the thickness of the insulating member (140) according to one embodiment may be greater than the thickness of the electrode lead (130).

[0093] For example, as shown in FIGS. 5 and 6, the depth of the groove of the insulating member (140) may be greater than or equal to the thickness of the electrode lead (130) so that the step difference between the insulating member (140) and the electrode lead (130) can be minimized when the second part (130b) of the electrode lead (130) is inserted into the groove of the insulating member (140).

[0094] For example, the depth of the groove portion of the insulating member (140) can correspond to the thickness of the electrode lead (130).

[0095] As another example, the groove of the insulating member (140) may have a depth capable of accommodating both the electrode lead (130) and the electrode tab end (120) welded to the electrode lead (130). For example, the depth of the groove of the insulating member (140) may correspond to the sum of the thicknesses of the electrode lead (130) and the electrode tab end (120).

[0096] Meanwhile, the insulating member (140) may have a groove of a depth capable of accommodating the electrode lead (130) (or the electrode lead (130) and the electrode tab end (120)) in its entirety, while having a thickness capable of stably supporting these configurations when the electrode lead (130) is welded to the electrode tab end (120). For example, the thickness of the insulating member (140) may be at least twice the thickness of the electrode lead (130).

[0097] As another example, when only a portion of the thickness of the second part (130b) of the electrode lead (130) is inserted into the groove of the insulating member (140), the thickness of the insulating member (140) may be the same as or similar to the thickness of the electrode lead (130). In this way, the thickness of the insulating member (140) can be set differently depending on the insertion depth of the electrode lead (130), and the thickness of the insulating member (140) can be further adjusted as needed.

[0098] According to one embodiment, the depth of the groove of the insulating member (140) may be greater than the thickness of the electrode lead (130). For example, as shown in FIG. 6, when the electrode tab end (120) and the integral lead member are joined, the depth of the groove of the insulating member (140) may be designed to be greater than the thickness of the electrode lead (130) in order to minimize or eliminate any step difference that may occur at the joining site. As a result, at least a portion of the electrode lead (130) can be completely inserted into the groove of the insulating member (140). Subsequently, a third region (120c) of the electrode tab end (120) is welded in an area overlapping with a second portion (130b) of the electrode lead (130) inserted into the groove of the insulating member (140), and a portion of the electrode tab end (120) is surrounded by the insulating member (140). This design not only enables a robust connection between the electrode lead (130) and the electrode tab end (120), but also prevents electrical short circuits between components and improves space utilization inside the battery case (150).

[0099] However, as described above, the formation of a groove in the insulating member (140) is merely one example, and a groove may not be formed separately in the insulating member (140). For example, as shown in FIG. 3, an integrated lead member may be formed by attaching an electrode lead to one side (e.g., the first side) of the insulating member. Such a form may vary depending on various design methods, and accordingly, the shape or configuration of the insulating member (140) may also be changed.

[0100] In the embodiment, the insulating member (140) may have various sizes and shapes. For example, the insulating member (140) may have a size and shape corresponding to the cross-section of the electrode assembly (110) accommodated inside the battery case (150). Through this, the insulating member (140) is in closer contact with the electrode assembly (110) inside the battery case (150), thereby reducing the risk of electrical short circuits and efficiently utilizing the internal space to increase the energy density of the secondary battery (100).

[0101] As another example, the size and shape of the cross-sectional portion of the insulating member (140) may be changed according to the shape of the cup portion (e.g., the receiving portion (156, 158)) of the battery case (150). For example, if the receiving portion (156, 158) of the battery case (150) has various shapes such as circular or elliptical, the insulating member (140) may also be designed to correspond to the shape of the receiving portion (156, 158).

[0102] For example, the insulating member (140) can act as a support inside the battery case (150). By doing so, the insulating member (140) can prevent the battery case (150) from being deformed due to bending or other causes caused by external impact.

[0103] FIG. 7 is a schematic perspective view showing an enlarged view of the electrode tab end, electrode lead, and insulating member of the secondary battery shown in FIG. 2.

[0104] Referring to FIG. 7, a secondary battery (100) according to one embodiment may be configured such that an electrode tab end (120) connects an electrode assembly (110) and an electrode lead (130) with an insulating member (140) in between in the inner space of a battery case (150) (e.g., electrode connection part (158, FIG. 2)).

[0105] For example, the electrode tab end (120) can be coupled to the electrode lead (130) and the insulating member (140), respectively.

[0106] According to one embodiment, the electrode lead (130) and the insulating member (140) can be combined to form an integrated lead member. For example, the electrode lead (130) may have an L-shape.

[0107] For example, at least a portion of the electrode lead (130) (e.g., a second portion (130b)) and one surface of the insulating member (140) (e.g., a first surface) may be joined together to form an integral lead member. At this time, at least a portion of the electrode lead (130) may be joined to the insulating member (140) on one surface of the insulating member (140), or inserted into a groove formed on one surface of the insulating member (140) to be joined to the insulating member (140).

[0108] For example, the electrode lead (130) may include a first part (130a) protruding outward from the inner space of the battery case (150), a second part (130b) coupled to the insulating member (140), and a third part (130c) between the first part (130a) and the second part (130b). For example, the second part (130b) may be parallel to the insulating member (140) and may form a predetermined angle with the first part (130a). In an embodiment, the second part (130b) may be positioned substantially perpendicular to the first part (130a), but may also be positioned to form various angles such as 80 degrees, 100 degrees, etc.

[0109] Meanwhile, in the embodiment, the second portion (130b) of the electrode lead (130) may be coupled to the insulating member (140) in an area where the end of the second portion (130b) corresponds to the opening (142) of the insulating member (140).

[0110] The electrode lead (130) and the insulating member (140) can be joined together in various ways (e.g., by bonding with adhesive tape, mechanical bonding, welding bonding, etc.), and this integrated lead member can be joined again to the electrode tab end (120).

[0111] For example, the electrode tab end (120) can be joined in an area that overlaps with the second part (130b) of the electrode lead (130) constituting the integrated lead member.

[0112] For example, when the second part (130b) of the electrode lead (130) is inserted into the groove of the insulating member (140) so that there is no step difference between the electrode lead (130) and the insulating member (140) or is minimized, the electrode tab end (120) can be joined within the depth of the groove of the insulating member (140) in the area where the electrode lead (130) overlaps with the second part (130b). At this time, the welding area (200) where the electrode tab end (120) and the electrode lead (130) are welded can be exposed to the outside, thereby facilitating the stability and inspection of the welding state.

[0113] For example, the electrode tab end (120) and the electrode lead (130) can serve to connect the electrode of the electrode assembly (110) to an external circuit. At this time, at least a portion of the electrode tab end (120) and the electrode lead (130) may be joined together by welding within an overlapping range. For example, a third region (120c) of the electrode tab end (120) and a second portion (130b) of the electrode lead (130) may be joined together by welding within an overlapping range. At this time, the area where the electrode tab end (120) and the electrode lead (130) are welded within the overlapping range may be referred to as the welding area (200).

[0114] Meanwhile, since the second portion (130b) of the electrode lead (130) is positioned below the opening (142) of the insulating member (140), such a welded area (200) can be formed in the area below the opening (142). The welded area (200) may be a portion where the third portion (120c) of the electrode tab end (120) and the second portion (130b) of the electrode lead (130) completely overlap, or a portion where they only partially overlap.

[0115] In one embodiment of the present invention, the electrode tab (112) and the electrode lead (130) of the electrode assembly (110) may be joined together by at least one welding process. For example, after a plurality of electrode tabs (112) are joined together by a welding method or similar to form an electrode tab end (120) (e.g., first welding), the electrode tab end (120) and the electrode lead (130) may be joined together by a welding method or similar to form an electrode tab end (e.g., second welding). As another example, a plurality of electrode tabs (112) and electrode leads (130) that are not joined together may be joined together at once by a single welding process (e.g., second welding) in a welding area (200).

[0116] The electrode tab end (120) and the insulating member (140) can be joined together. However, the electrode tab end (120) and the insulating member (140) may not be directly joined by means such as welding.

[0117] The electrode tab end (120) and the insulating member (140) can be joined in such a way that the electrode tab end (120) is received in the opening (142) of the insulating member (140) and interlocked. The electrode tab end (120) is received in the opening (142) of the insulating member (140), but is not constrained by the opening (142) and can move within the opening (142). As a result, the position where the electrode tab end (120) is received in the opening (142) may vary. For example, a first region (120a) of the electrode tab end (120) may be received in the opening (142) of the insulating member (140). A portion of the electrode tab end (120) that is coupled with the second portion (130b) of the electrode lead (130) may be bent with respect to the opening (142). At this time, the bent portion may be included within the second region (120b) of the electrode tab end (120).

[0118] Meanwhile, in order for the electrode tab end (120) to be stably received in the opening (142) of the insulating member (140), the width of the electrode tab end (120) may be configured to correspond to the width of the opening (142) of the insulating member (140).

[0119] Meanwhile, in one embodiment of the present invention, the joining method between the electrode tab end (120) and the electrode lead (130) and between the electrode lead (130) and the insulating member (140) is generally joined to each other by welding, but this is merely exemplary and each component may be joined by any other method.

[0120] FIG. 8 is a schematic cross-sectional view of a secondary battery according to one embodiment of the present disclosure. For example, FIG. 8 may correspond to a cross-sectional view for explaining another embodiment of the sealing region shown in FIG. 2.

[0121] Referring to FIG. 8, unlike the sealing area (300) shown in FIG. 2, the sealing area (300, 320) in which the internal components of the secondary battery (100) and the battery case (150) according to one embodiment of the present invention are sealed may be configured as a more extensive area than the sealing area (300) shown in FIG. 2.

[0122] For example, such a sealing area may include a first sealing area (300) and a second sealing area (320).

[0123] The first sealing area (300) may refer to an area where the third part (130c) of the electrode lead (130) and the sealing part (154) of the battery case (150) are sealed.

[0124] For example, the electrode lead (130) may protrude to the outside of the battery case (150) through the first sealing area (300). At this time, the protruding electrode lead (130) may be the first part (130a) of the electrode lead (130). The third part (130c) of the electrode lead (130) is located in the first sealing area (300), and the outer circumference of the third part (130c) may be sealed in the sealing portion (154) of the upper and lower cases (150a, 150c) and in the first sealing area (300).

[0125] The second sealing area (320) may refer to an area that is sealed between one side of the insulating member (140) (e.g., the first side) and one side of the battery case (150). At this time, the insulating member (140) and one side of the battery case (150) may be parallel to one side of the electrode assembly (110). For example, the second sealing area (320) may be an area that is sealed including the electrode tab end (120) and the electrode lead (130) existing between the insulating member (140) and the battery case (150).

[0126] For example, the second sealing area (320) may include an area where the upper side of the insulating member (140) and the upper case (150a) are sealed, and an area where the lower side of the insulating member (140) and the lower case (150b) are sealed. At this time, the third area (120c) of the mutually coupled electrode tab end (120) and the second part (130b) of the electrode lead (130) may be sealed together in the area where the upper side of the insulating member (140) and the upper case (150a) are sealed. However, since the electrode tab end (120) and the electrode lead (130) are conductive members, a separate additive may be added to the second sealing area (320) to prevent electrical short circuits between the components and to provide sealing.

[0127] In the second sealing area (320), sealing the internal components of the secondary battery (100) and the battery case (150) can provide various advantages. For example, if one side of an insulating member (140) that is parallel to each other (e.g., the first side) and one side of the battery case (150) are sealed in the second sealing area (320), the width between the insulating member (140) and one side of the battery case (150) including the sealing portion (154) can be further reduced. Through this, the space of the electrode connection portion (158) within the battery case (150) is reduced, and as a result, the space utilization of the electrode connection portion (158) is increased, thereby increasing the energy density of the secondary battery (100).

[0128] For example, the secondary battery (100) can better protect the electrode assembly (110) from external shocks by sealing it in the second sealing area (320). In particular, the insulating member (140) can perform its role as a support more effectively by being sealed and fixed together with the battery case (150). Additionally, the electrode tab end (120), the electrode lead (130), and the insulating member (140) are sealed in such a way that an integrated member is joined together with one side of the battery case (150), thereby preventing a short circuit inside the secondary battery (100) that may occur due to external shocks.

[0129] FIG. 9 is a flowchart illustrating a method for manufacturing a secondary battery according to an embodiment of the present invention. FIGS. 10 to 13 are drawings sequentially illustrating the manufacturing process of a secondary battery according to an embodiment of the present invention.

[0130] Hereinafter, a method for manufacturing a secondary battery (100) according to one embodiment of the present invention will be described step by step with reference to FIGS. 9 to 13.

[0131] A method for manufacturing a secondary battery (100) according to one embodiment of the present invention may include, in step S100, the step of combining an electrode lead (130) and an insulating member (140) to form an integrated lead member.

[0132] In an embodiment, the integrated lead member may be composed of a combination of an electrode lead (130) and an insulating member (140). For example, the electrode lead (130) may be a conductive member and may correspond to a configuration for electrically connecting the electrode assembly (110) and an external circuit, and the insulating member (140) may correspond to a configuration for preventing an electrical short circuit between the electrode lead (130) and the secondary battery (100).

[0133] For example, the electrode lead (130) may be coupled to one side (e.g., the first side) of the insulating member (140). At this time, at least a portion of the electrode lead (130) may be coupled to the insulating member (140) on one side of the insulating member (140) or inserted into a groove formed on one side of the insulating member (140) to be coupled to the insulating member (140). At this time, the step difference between the insulating member (140) and the electrode lead (130) may vary depending on the thickness of the insulating member (140) and the depth of the groove formed in the insulating member (140). This may affect the step difference formed when the integral lead member is subsequently coupled with a plurality of electrode tabs (112) or electrode tab ends (120).

[0134] For example, the electrode lead (130) can be bonded to one side of the insulating member (140). For example, the electrode lead (130) and the insulating member (140) can be bonded together through a predetermined adhesive, and in addition to the adhesive, the electrode lead (130) and the insulating member (140) can be bonded together by various materials and methods.

[0135] Meanwhile, the electrode lead (130) may be configured in an L-shape. For example, the L-shaped electrode lead (130) may include a first region joined to an insulating member (140) and a second region extending in a direction perpendicular from the joined region.

[0136] For example, the insulating member (140) may be a plastic structure having insulating properties.

[0137] Meanwhile, in one embodiment, the insulating member (140) may include an opening (142) formed at one end of the insulating member (140). For example, an electrode lead (130) may be joined to the insulating member (140) by means such as welding at a position corresponding to the opening (142) of the insulating member (140) (e.g., below the opening (142)).

[0138] Next, a method for manufacturing a secondary battery (100) according to one embodiment may include, in step S120, a step of welding an integral lead member to an electrode tab (112) of an electrode assembly (110).

[0139] Welding between the electrode tab (112) and the integral lead member can be performed on one side (e.g., the first side) of the insulating member (140) to which the L-shaped electrode lead (130) is joined. For example, the electrode tab (112) welded to the integral lead member may be a bundle of multiple electrode tabs (112) extending from multiple electrodes of the electrode assembly (110). As another example, the electrode tab (112) may refer to an electrode tab end (120), which is formed by gathering a bundle of multiple electrode tabs (112) into one and joining them together by means such as welding.

[0140] As illustrated in FIG. 11, the electrode tab end (120) may be formed by gathering a plurality of electrodes on the upper side of the electrode assembly (110). A portion of an integrated lead member is placed on the bottom surface of the electrode tab end (120), and can be welded in the overlapping range between the electrode tab end (120) and the integrated lead member. The electrode tab end (120) is welded to a portion of the L-shaped electrode lead (130) of the integrated lead member and is in a perpendicular relationship with another portion of the electrode lead (130). Additionally, the electrode tab end (120) is in a parallel relationship with the insulating member (140) of the integrated lead member. At this time, the part welded to the integral lead member at the electrode tab end (120) corresponds to the third region (120c) of the electrode tab end (120), and the part of the electrode lead (130) welded to the second region (120b) of the electrode tab end (120) may correspond to the second part (130b) of the electrode lead (130).

[0141] Meanwhile, for example, when the second part (130b) of the electrode lead (130) is inserted into the groove of the insulating member (140) so that there is no step difference between the electrode lead (130) and the insulating member (140) or is minimized, a plurality of electrode tabs (112) or electrode tab ends (120) can be joined within the depth of the groove of the insulating member (140) in the area where the electrode lead (130) overlaps with the second part (130b).

[0142] Next, a method for manufacturing a secondary battery (100) according to one embodiment may include, in step S140, a step of bending a portion of the electrode tab (112) and rotating an integrated lead member welded to the electrode tab (112) by 90 degrees.

[0143] For example, a secondary battery (100) according to an embodiment can be formed by bending a portion of the electrode tab (112) to increase the space utilization inside the battery case (150), and rotating an integrated lead member welded to the electrode tab (112) 90 degrees toward one side of the electrode assembly (110). At this time, as described above, the electrode tab (112) may refer to the electrode tab end (120).

[0144] For example, as shown in FIG. 11, when a portion of the electrode tab end (120) is bent so that the integral lead member rotates in the direction of the arrow, the components of the secondary battery (100) can be arranged as shown in FIG. 12. Through this bending, the horizontal length of the mutually coupled electrode tab end (120) and the integral lead member is reduced, and the proportion of space occupied by these components inside the battery case (150) can be reduced compared to before the bending.

[0145] Additionally, through this bending, the insulating member (140) is positioned between the electrode assembly (110) and the electrode lead (130), so that the insulating member (140) can prevent an electrical short circuit between the electrode assembly (110) and the electrode lead (130) and can perform the role of a support inside the secondary battery (100).

[0146] Meanwhile, as the electrode tab end (120) is bent, the electrode tab end (120) can be divided into a first region (120a) connected to the electrode assembly (110), a second region (120b) which is the bent portion, and a third region (120c) welded to the integral lead member. A portion of the first region (120a) of the electrode tab end (120) is received in an opening (142) formed in the insulating member (140) when the integral lead member rotates, and the insulating member (140) can be positioned parallel to one side of the electrode assembly (110).

[0147] Next, a method for manufacturing a secondary battery (100) according to one embodiment may include, in step S160, the step of receiving an electrode assembly (110) inside a battery case (150) and sealing the edges.

[0148] In an embodiment, internal components of a secondary battery (100) (e.g., electrode assembly (110), integrated lead member, etc.) can be inserted into the receiving portions (156, 158) of a battery case (150), and then the joining portions (152) of the upper and lower cases (150a, 150b) can be joined and the sealing portion (154) of the battery case (150) can be sealed to form a secondary battery (100).

[0149] For example, referring to FIG. 13, the step of inserting internal components of a secondary battery (100) according to one embodiment of the present invention into the receiving portions (156, 158) of a battery case (150) may be the step of inserting internal components of the secondary battery (100) formed through the aforementioned steps S100 to S140 into the receiving portions (156, 158) of the battery case (150).

[0150] For example, as shown in FIG. 13, the receiving portion (156, 158) of the battery case (150) is a space between the upper and lower cup portions formed in the upper and lower cases (150a, 150b), and the receiving portion (156, 158) can accommodate a configuration in which an electrode assembly (110), an electrode tab end (120), and an integrated lead member are combined.

[0151] The step of joining the joint portions (152) of the upper and lower cases (150a, 150b) according to one embodiment of the present invention may be a step of joining the joint portions (152) of the upper and lower cases (150a, 150b) to each other by means such as welding so that the components contained inside the battery case (150) are not discharged to the outside or receive external impact.

[0152] Referring to FIG. 13, the step of sealing a part of an integrated lead member protruding to the outside of a battery case (150) according to one embodiment of the present invention and a sealing part (154) of the battery case (150) may be a step of sealing a part of the integrated lead member together with the sealing part (154) of the battery case (150) in a first sealing area (300). At this time, a part of the integrated lead member passes through the first sealing area (300) and protrudes to the outside, and if the part connected to an external circuit is not fixed, it may be vulnerable to external impact. To prevent this, the integrated lead member and the battery case (150) may be sealed in the first sealing area (300).

[0153] Additionally, the sealing step may include not only sealing the integrated lead member and the sealing portion (154) in the first sealing area (300), but also sealing the space between the insulating member (140) and the battery case (150) in the second sealing area (320). In this process, the electrode tab end (120) and the electrode lead (130) located between the insulating member (140) and the battery case (150) are also sealed, thereby more firmly securing the components inside the battery case (150) and reducing the proportion they occupy in the internal space.

[0154] Meanwhile, the step of joining the upper and lower cases (150a, 150b) of the battery case (150) and the step of sealing the integrated lead member and the sealing portion (154) of the battery case (150) can be performed independently or simultaneously.

[0155] Although the present invention has been described with respect to specific examples including preferred modes of carrying out the present invention, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that numerous modifications and substitutions of the systems and technologies described above are possible without departing from the essential characteristics of the invention. It should be understood that other embodiments may be utilized and that structural and functional modifications may be made without departing from the scope of the invention. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

Claims

1. In secondary batteries, An electrode assembly comprising a plurality of electrodes, an electrode tab extending from at least one of the plurality of electrodes, and a separator interposed between the plurality of electrodes; An electrode lead electrically connected to the electrode tab; and The insulating member comprises a first surface facing the electrode lead and a second surface opposite to the first surface, and is disposed between the plurality of electrodes and the electrode lead. The insulating member comprises an opening configured to allow at least a portion of the electrode tab to pass between the first surface and the second surface, Secondary battery.

2. In Paragraph 1, The battery case further includes accommodating the electrode assembly and having a sealing portion formed on the edge. The above electrode lead is, A first part protruding outward from the battery case; A second part positioned vertically to the first part on the inner side of the battery case; and A third portion including a portion overlapping with the sealing portion of the battery case, Secondary battery.

3. In Paragraph 2, The above second portion includes an area overlapping with the electrode tab, and The area where the above second part and the electrode tab overlap is joined together by a single welding operation, Secondary battery.

4. In Paragraph 3, The area where the above-mentioned second part and the above-mentioned electrode tab overlap is, After the welding operation, the insulating member is bent at a position corresponding to the opening and positioned in a direction perpendicular to the first part. Secondary battery.

5. In Paragraph 2, The insulating member is arranged in a direction perpendicular to the first part and is combined with one surface of the second part to form an integrated lead member. Secondary battery.

6. In Paragraph 1, The insulating member has a size and shape corresponding to the cross-sectional portion of the electrode assembly. Secondary battery.

7. In Paragraph 1, The battery case further includes accommodating the electrode assembly and having a sealing portion formed on the edge. The insulating member, the electrode tab, and a portion of the electrode lead welded to the electrode tab are located on the inside of the battery case, and Another part of the electrode lead is disposed on the outside of the battery case, Secondary battery.

8. In Paragraph 1, The insulating member includes a groove in which the electrode lead is at least partially received, and At least a portion of the electrode tab is electrically coupled to the electrode lead at a position corresponding to the groove, Secondary battery.

9. In Paragraph 8, The depth of the above groove is greater than the thickness of the electrode lead, Secondary battery.

10. In Paragraph 1, The thickness of the electrode lead is smaller than the thickness of the insulating member. Secondary battery.

11. In a method for manufacturing a secondary battery, A step of forming an integrated lead member by combining an electrode lead and an insulating member; A step of positioning the electrode tab of the electrode assembly to pass through an opening formed on one side of the insulating member; A step of welding the above-mentioned integrated lead member to the electrode tab of the electrode assembly; A step of bending a portion of the electrode tab to rotate the integrated lead member welded to the electrode tab by 90 degrees; and The method comprises the step of placing the electrode assembly inside the battery case and sealing the edge of the battery case. Method for manufacturing a secondary battery.

12. In Paragraph 11, The insulating member includes a first surface to which the electrode lead is coupled and a second surface opposite to the first surface, The welding step mentioned above is, A step comprising welding on the first surface the portion where the electrode tab passing through the opening and the integrated lead member overlap. Method for manufacturing a secondary battery.

13. In Paragraph 11, The step of rotating the integrated lead member welded to the electrode tab by 90 degrees is: A step comprising bending the electrode tab based on an opening receiving the electrode tab, and rotating the integrated lead member welded to the electrode tab 90 degrees in the direction of the electrode assembly. Method for manufacturing a secondary battery.

14. In Paragraph 11, The above sealing step is, A step comprising sealing the edge of the battery case with a portion of the integrated lead member protruding to the outside of the battery case, Method for manufacturing a secondary battery.

Images