Method for manufacturing secondary battery, coupling clip for manufacturing secondary battery, and secondary battery

Abstract

The present invention relates to a method for manufacturing a secondary battery, a coupling clip for manufacturing a secondary battery, and a secondary battery. The method for manufacturing a secondary battery includes: a housing process, wherein an electrode assembly is housed in a battery case so that electrode leads connected to the electrode assembly protrude from both sides of the battery case to the outside; a sealing process, wherein the outer peripheral surface of the battery case is sealed to form a battery after the housing process; a coupling process, wherein the coupling clip is coupled to the electrode lead after the sealing process; and a conveying process, wherein the battery is conveyed to a position of a next process after the clamp clamps the coupling clip after the coupling process.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2020-0062591, filed on May 25, 2020, which is hereby incorporated by reference in its entirety. Technical Field

[0003] The present invention relates to a method for manufacturing a secondary battery, a combining clip for manufacturing a secondary battery, and a secondary battery. Background Art

[0004] Unlike primary batteries, secondary batteries are rechargeable and have a higher possibility of compact size and high capacity. Therefore, many studies are being conducted on secondary batteries recently. With the development of technology and the increase in demand for mobile devices, the demand for secondary batteries as energy sources is rapidly increasing.

[0005] According to the shape of the battery case, rechargeable batteries are divided into coin-type batteries, cylindrical batteries, prismatic batteries and pouch-type batteries. The secondary battery contains an electrode assembly and an electrolyte. In such a secondary battery, the electrode assembly installed in the battery case is a chargeable and dischargeable power generating device having a structure in which electrodes and separators are stacked.

[0006] Electrode assemblies can be roughly divided into jelly-roll type electrode assemblies, stacked type electrode assemblies, and stacked / folded type electrode assemblies. In the jelly-roll type electrode assembly, a separator is inserted between the positive electrode and the negative electrode, each of the positive electrode and the negative electrode is provided in the form of a sheet coated with an active material, and then the positive electrode, the separator and the negative electrode are wound. In the stacked type electrode assembly, a plurality of positive electrodes and negative electrodes are sequentially stacked with a separator between them, and in the stacked / folded type electrode assembly, stacked unit cells are wound together with an isolation film having a longer length.

[0007] The pouch-type battery according to the related art is configured in the form of an electrode assembly contained in a pouch. In such a pouch-type battery, the pouch repeatedly expands and contracts due to the generation of gas during charging and discharging. Here, if the generated gas remains in the pouch, it will cause battery performance degradation and volume change, which has the problem of adversely affecting the surrounding batteries and structures. In addition, when the generated gas exceeds the storage limit of the pouch, a venting (Vent) phenomenon occurs in which the gas rushes into a weak part of the structure and leaks. When the venting phenomenon occurs, there are problems of electrolyte leakage and battery life exhaustion.

[0008] In the related art, there is a problem in that since the electrode lead is bent at the end of the pouch during the process of manufacturing the pouch battery, damage such as wrinkling or denting of the electrode lead is likely to occur during clamping of the battery.

[0009] When the welding conditions are adjusted to improve the bending degree of the electrode lead, the risk of tab disconnection or the like is greater, and thus it is almost impossible to improve the bending degree.

[0010] In addition, since the bending direction and angle of the electrode lead of the produced battery are random, it is difficult to adjust the bending conditions in the subsequent process.

[0011] [Prior art document] (Patent document 1) Korean Patent Publication No. 10-2014-0015647 Summary of the invention

[0012] Technical issues

[0013] An aspect of the present invention is to provide a method for manufacturing a secondary battery, a coupling clip for manufacturing a secondary battery, and a secondary battery capable of preventing a defect of lead bending from occurring during a manufacturing process.

[0014] Technical Solution

[0015] According to an embodiment of the present invention, a method for manufacturing a secondary battery may include: an accommodating process, accommodating an electrode assembly in a battery case so that electrode leads connected to the electrode assembly protrude to the outside from both sides of the battery case; a sealing process, sealing the outer peripheral surface of the battery case to form a battery after the accommodating process; a bonding process, bonding a bonding clip to the electrode leads after the sealing process; and a conveying process, conveying the battery to a position of a next process after a clamp clamps the bonding clip after the bonding process.

[0016] In a coupling clip for manufacturing a secondary battery according to an embodiment of the present invention, the coupling clip can be pre-bonded to a portion of an electrode lead of a battery that is clamped by a clamp to move the battery when manufacturing the secondary battery, the inner portion of the coupling clip facing the electrode lead can be made of a rubber material, and the outer portion of the coupling clip can be made of plastic, and when the coupling clip is coupled to the electrode lead, a fixed surface of the coupling clip that faces each of the two surfaces of the electrode lead and is in close contact with the electrode lead can be set to a flat surface so that the bent portion of the electrode lead is flattened.

[0017] In addition, in a secondary battery according to an embodiment, the combining clip for manufacturing a secondary battery according to an embodiment of the present invention may be combined.

[0018] Beneficial Effects

[0019] According to the present invention, after the bonding clip is bonded to the electrode lead of the battery, the clamp can clamp the bonding clip to transfer the battery to the position of the next process, thereby preventing the electrode lead from being wrinkled or damaged. In addition, the bonding clip can be bonded in close contact with the electrode lead of the battery to flatten the electrode lead, thereby preventing defects from occurring due to deformation of the electrode lead. As a result, the defect rate of the secondary battery is reduced to reduce costs, and the number of stops and rest time of the production line can be significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a plan view illustrating a housing process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0021] Figure 2 is a plan view illustrating a sealing process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0022] Figure 3 is a perspective view illustrating a state before a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0023] Figure 4 is a perspective view illustrating a state in which a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0024] Figure 5 is a side view illustrating a state before a coupling clip is folded in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0025] Figure 6 is a side view illustrating a state after a coupling clip is folded in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0026] Figure 7 is a perspective view illustrating a state before a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0027] Figure 8 is a perspective view illustrating a state in which a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0028] Fig. 9 is a side view illustrating a folding process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0029] Fig.10is a perspective view illustrating a state before a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention.

[0030] Fig.11 is a perspective view illustrating a state in which a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention.

[0031] Fig.12 is a perspective view illustrating a state in which a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention.

[0032] Fig.13 is an exploded perspective view of an electrode lead and a coupling clip in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention.

[0033] Fig.14 is a perspective view illustrating a state in which a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to another embodiment of the present invention.

[0034] Fig.15 is a perspective view illustrating a state in which a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to another embodiment of the present invention. DETAILED DESCRIPTION

[0035] The purpose, specific advantages and novel features of the present invention will become more apparent through the following detailed description in conjunction with the accompanying drawings. It should be noted that reference numerals are added to the components in the drawings of the present application with the same reference numerals as much as possible, even if these components are shown in other drawings. In addition, the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. In the following description of the present invention, detailed descriptions of related technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

[0036] Method for manufacturing a secondary battery according to an embodiment

[0037] Figure 1 is a plan view illustrating a housing process in a method for manufacturing a secondary battery according to an embodiment of the present invention, Figure 2 is a plan view illustrating a sealing process in a method for manufacturing a secondary battery according to an embodiment of the present invention, Figure 3 is a perspective view illustrating a state before a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention, Figure 4is a perspective view illustrating a state in which a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0038] also, Figure 5 is a side view illustrating a state before a coupling clip is folded in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention, Figure 6 is a side view illustrating a state after a coupling clip is folded in a coupling process in a method for manufacturing a secondary battery according to an embodiment of the present invention, Figure 7 is a perspective view illustrating a state before a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to an embodiment of the present invention, Figure 8 is a perspective view illustrating a state in which a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to an embodiment of the present invention, Fig. 9 is a side view illustrating a folding process in a method for manufacturing a secondary battery according to an embodiment of the present invention.

[0039] Reference Figures 1 to 9 , the method for manufacturing a secondary battery according to an embodiment of the present invention includes: a housing process of housing the electrode assembly 20 in the battery case 10; a sealing process of sealing the outer peripheral surface 13 of the battery case 10 to form a battery (Cell) 1; a bonding process of bonding the bonding clip 100 to the electrode lead 30; and a conveying process of conveying the battery 1 after clamping the bonding clip 100 by using a jig Z. In addition, the method for manufacturing a secondary battery according to an embodiment of the present invention may further include: a bonding release process of releasing the bonding of the bonding clip 100; and a folding process of folding the side (side) of the battery case 10.

[0040] In more detail, refer to Figure 1 In the accommodation process, the electrode assembly 20 may be accommodated in the accommodation part 11 of the battery case 10. Here, in the accommodation process, the electrode lead 30 connected to the electrode assembly 20 may be accommodated to protrude from both sides of the battery case 10 to the outside.

[0041] The electrode assembly 20 is a chargeable and dischargeable power generating element in which electrodes and separators may be alternately stacked. Here, electrode tabs and electrode leads 30 disposed at ends of the electrode assembly 20 may be connected to each other to connect the electrode assembly 20 to an external device.

[0042] The electrode may be composed of a positive electrode and a negative electrode. At this time, the electrode assembly 20 may have a structure in which positive electrodes / separators / negative electrodes are alternately stacked.

[0043] In addition, the electrode lead 30 may include a positive electrode lead connected to a positive electrode tab provided at an end of the positive electrode and a negative electrode lead connected to a negative electrode tab provided at an end of the negative electrode.

[0044] The positive electrode may include a positive electrode collector and a positive electrode active material stacked on the positive electrode collector.

[0045] The positive electrode current collector may be made of aluminum foil.

[0046] The positive electrode active material may include lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound or mixture including at least one of the foregoing materials.

[0047] The negative electrode may include a negative electrode collector and a negative electrode active material stacked on the negative electrode collector.

[0048] The negative electrode current collector may be made of, for example, a foil made of a copper (Cu) material.

[0049] The negative electrode active material may be a compound or a mixture including a graphite-based material.

[0050] The separator is made of an insulating material to electrically insulate the positive electrode and the negative electrode from each other. Here, the separator may be made of a polyolefin resin film having microporosity such as polyethylene or polypropylene.

[0051] Reference Figure 1 and Figure 2 In the sealing step, the battery 1 is formed by sealing the outer peripheral surface 13 of the battery case 10 after the housing step.

[0052] The outer peripheral surface 13 is an edge portion of the body 12 accommodating the electrode assembly 20 , and the outer peripheral surface 13 may be thermally fused by applying heat and pressure during the sealing process.

[0053] Reference Figures 3 to 6 In the bonding process, the bonding clip 100 is bonded to the electrode lead 30 after the sealing process.

[0054] The coupling clip 100 may be coupled with the electrode lead 30 in close contact so that a bent portion of the electrode lead 30 is flattened.

[0055] In the coupling process, both surfaces of the electrode lead 30 are fixed by the coupling clip 100 , and each of the fixing surfaces 141 and 142 of the coupling clip 100 facing both surfaces of the electrode lead 30 may be formed as a flat surface.

[0056] In the coupling process, both sides of the electrode lead 30 may be fixed by folding the two side portions 110 and 120 of the coupling clip 100 in a direction close to each other around the central portion of the coupling clip 100. Here, the coupling clip 100 has a cutout portion 131 formed at the outer side of the central portion so that the two side portions 110 and 120 are folded around the inner side of the central portion. Here, when the two side portions 110 and 120 are folded, one side portion 110 and the other side portion 120 may be folded in a direction close to each other.

[0057] In the bonding process, the bonding clip 100 can be folded to The shape surrounds the electrode lead 30.

[0058] In the bonding process, the thickness t1 of the bonding clip 100 bonded to the electrode lead 30 is the same as the thickness t2 of the battery case 10, and both surfaces of the battery case 10 and the bonding clip 100 may be disposed on the same plane in the thickness direction.

[0059] In the combining process, a folding portion 130 may be formed at a central portion of the combining clip 100 so that the two side portions 110 and 120 are folded in a manner of folding the two side portions 110 and 120 around the folding portion 130. A first combining portion 160 and a second combining portion 170 combined with each other may be formed at ends of the two side portions 110 and 120 of the combining clip 100 to fix the folded state of the combining clip 100. Here, the first combining portion 160 is provided at an end of one side portion 110 of the combining clip 100, and the second combining portion 170 is provided at an end of the other side portion 120. When the two side portions 110 and 120 of the combining clip 100 are folded around the folding portion 130, the first combining portion 160 and the second combining portion 170 may be provided on a surface facing the combining clip 100.

[0060] The first coupling portion 160 includes a first protrusion 161, and the second coupling portion 170 includes a second protrusion 171. Therefore, when the two side portions 110 and 120 of the coupling clip 100 are folded around the folding portion 130, the first protrusion 161 and the second protrusion 171 may be staggered and contacted with each other and then press-fitted with each other. Here, a coupling fitting groove 162 is formed at the side end of the first protrusion 161 in the first coupling portion 160, and a coupling protrusion 172 is formed at a portion corresponding to the coupling fitting groove 162 at the side end of the second protrusion 171 in the second coupling portion 170. As the coupling protrusion 172 is press-fitted into the coupling fitting groove 162, the first coupling portion 160 and the second coupling portion 170 may be coupled to each other.

[0061] In the coupling process, the inner portion 140 of the coupling clip 100 coupled with the electrode lead 30 may be made of a rubber material, and the outer portion 150 may be made of plastic. Here, the rubber material may be, for example, synthetic rubber or silicone rubber.

[0062] For example, when the coupling clip 100 is folded, the portion facing the electrode lead 30 except the first coupling portion 160 and the second coupling portion 170 inside thereof and the folded portion 130 may be made of a rubber material. Here, each of the first coupling portion 160 and the second coupling portion 170 may be made of plastic.

[0063] For another example, when the coupling clip 100 is folded, the portion of the inside thereof facing the electrode lead 30 except the folding portion 130, the first coupling portion 160, and the second coupling portion 170 may be made of a rubber material. Here, each of the folding portion 130, the first coupling portion 160, and the second coupling portion 170 may be made of plastic. Here, since the plastic is made of a flexible material, the folding portion 130 may be easily folded, and the folding portion 130 may also be reused.

[0064] As another example, the entire inner portion of the coupling clip 100 including the folding portion 130 , the first coupling portion 160 , and the second coupling portion 170 when folded may be made of a rubber material.

[0065] Reference Figure 7 and Figure 8 After the combining process is completed, in the conveying process, the clamp Z clamps the combining clip 100, and then the battery 1 is conveyed to the subsequent manufacturing process.

[0066] Here, the jigs Z are provided as a pair and move in directions approaching each other to press and fix the coupling clip 100 .

[0067] After the transfer process, in a coupling release process, the coupling of the coupling clip 100 coupled to the electrode lead 30 may be released.

[0068] Here, in the coupling release process, the coupling of the first coupling portion 160 and the second coupling portion 170 may be released to separate the coupling clip 100 from the electrode lead 30 .

[0069] Reference Fig. 9 In the folding process, the side surfaces of the battery case 10 may be folded.

[0070] In the folding process, two side surfaces of the remaining two directional portions except the two directional portions where the electrode leads 30 are located among the four directional portions of the outer circumferential surface 13 of the battery case 10 may be folded to be wound in the direction of the main body 12 of the battery case 10 .

[0071] Reference Figure 8, in the method for manufacturing a secondary battery according to an embodiment of the present invention configured as described above, after the coupling clip 100 is coupled to the electrode lead 30 of the battery 1, the jig Z may clamp the coupling clip 100 to transfer the battery 1 to a position of a next process, thereby preventing the electrode lead 30 from being wrinkled or damaged due to interference of the jig Z. In addition, the coupling clip 100 may be in close contact with the electrode lead 30 to flatten the electrode lead 30, thereby preventing defects of the electrode lead 30 from occurring due to deformation of the electrode lead 30. As a result, the defect rate of the secondary battery is reduced to reduce costs, and the number of stops and rest time of the production line can be significantly reduced.

[0072] Method for manufacturing a secondary battery according to another embodiment

[0073] Hereinafter, a method for manufacturing a secondary battery according to another embodiment of the present invention will be described.

[0074] Fig.10 is a perspective view illustrating a state before a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention, Fig.11 is a perspective view illustrating a state in which a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention, Fig.12 is a perspective view illustrating a state in which a coupling clip is coupled to an electrode lead in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention.

[0075] Fig.13 is an exploded perspective view of an electrode lead and a coupling clip in a coupling process in a method for manufacturing a secondary battery according to another embodiment of the present invention, Fig.14 is a perspective view illustrating a state in which a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to another embodiment of the present invention, Fig.15 is a perspective view illustrating a state in which a jig clamps a combining clip in a conveying process in a method for manufacturing a secondary battery according to another embodiment of the present invention.

[0076] Reference Figure 1 , Figure 2 and Figures 9 to 15, the method for manufacturing a secondary battery according to another embodiment of the present invention includes: an accommodation process of accommodating the electrode assembly 20 in the battery case 10; a sealing process of sealing the outer peripheral surface 13 of the battery case 10 to form the battery 1; a bonding process of bonding the bonding clip 200 to the electrode lead 30; and a conveying process of conveying the battery 1 after clamping the bonding clip 100 by using the jig Z. In addition, the method for manufacturing a secondary battery according to another embodiment of the present invention may further include: a bonding release process of releasing the bonding of the bonding clip 200; and a folding process of folding the side of the battery case 10.

[0077] The method for manufacturing a secondary battery according to another embodiment of the present invention is different from the method for manufacturing a secondary battery according to the embodiment of the present invention described above in that a coupling clip 200 having a different structure is used in the coupling process. Therefore, in the description of the method for manufacturing a secondary battery according to another embodiment of the present invention, the contents repeated with the method for manufacturing a secondary battery according to the aforementioned embodiment of the present invention will be omitted or briefly described, and the differences therebetween will be mainly described.

[0078] In more detail, refer to Figure 1 and Figure 2 In the accommodation process, the electrode assembly 20 may be accommodated in the accommodation part 11 of the battery case 10. Here, in the accommodation process, the electrode lead 30 connected to the electrode assembly 20 may be accommodated to protrude from both sides of the battery case 10 to the outside.

[0079] In the sealing step, the battery cell 1 is formed by sealing the outer peripheral surface 13 of the battery case 10 after the housing step.

[0080] Reference Figures 10 to 13 In the bonding process, the bonding clip 200 is bonded to the electrode lead 30 after the sealing process.

[0081] The coupling clip 200 may be coupled with the electrode lead 30 in close contact so that a bent portion of the electrode lead 30 is flattened.

[0082] In the coupling process, the inner portion 240 of the coupling clip 200 coupled with the electrode lead 30 may be made of a rubber material, and the outer portion 250 may be made of plastic.

[0083] In the coupling process, a coupling groove 210 is formed in the coupling clip 200 so that the electrode lead 30 and a portion of the outer circumferential surface 13 of the battery case 10 are inserted into the coupling groove 210 and coupled.

[0084] In the coupling process, the coupling groove 210 of the coupling clip 200 includes: a lead receiving portion 211 into which the electrode lead 30 is inserted; and an outer peripheral surface receiving portion 212 into which the outer peripheral surface 13 of the battery case 10 is inserted. Here, the height a1 of the lead receiving portion 211 may be formed to correspond to the height a2 of the electrode lead 30, and the height b1 of the outer peripheral surface receiving portion 212 may be formed to correspond to the height b2 of the outer peripheral surface 13 of the battery case 10.

[0085] Therefore, when the electrode lead 30 is inserted into the coupling groove 210 of the coupling clip 200 and coupled in the coupling process, the bent portion of the electrode lead 30 may be flattened.

[0086] Reference Fig.14 and Fig.15 After the combining process is completed, in the conveying process, the clamp Z clamps the combining clip 200, and then the battery 1 is conveyed to the subsequent manufacturing process.

[0087] After the transfer process, in a coupling release process, the coupling of the coupling clip 200 coupled to the electrode lead 30 may be released.

[0088] In the method for manufacturing a secondary battery according to another embodiment of the present invention configured as described above, after the coupling clip 200 is coupled to the electrode lead 30 of the battery 1, the jig Z may clamp the coupling clip 200 to transfer the battery 1 to a position of a next process, thereby preventing the electrode lead 30 from being wrinkled or damaged due to interference of the jig Z. In addition, the electrode lead 30 may be coupled to the coupling groove 210 of the coupling clip 200 to flatten the electrode lead 30, thereby preventing defects of the electrode lead 30 from occurring due to deformation of the electrode lead 30. As a result, the defect rate of the secondary battery is reduced to reduce costs, and the number of stops and rest time of the production line can be significantly reduced.

[0089] Combination clip for manufacturing a secondary battery according to an embodiment

[0090] Hereinafter, a combining clip for manufacturing a secondary battery according to an embodiment of the present invention will be described.

[0091] Reference Figures 3 to 8 , the coupling clip 100 for manufacturing a secondary battery according to an embodiment of the present invention is pre-bonded to a portion of the electrode lead 30 of the battery 1 which is clamped by the jig Z to transfer the battery 1 when manufacturing the secondary battery, and includes an outer portion 150 and an inner portion 140 facing the electrode lead 30, and fixing surfaces 141 and 142 are in close contact with the electrode lead 30. In addition, the coupling clip 100 for manufacturing a secondary battery according to an embodiment of the present invention further includes two side portions 100 and 120 provided with the fixing surfaces 141 and 142 and a folded portion 130 formed at a central portion.

[0092] The combining clip 100 for manufacturing a secondary battery according to an embodiment of the present invention relates to the combining clip 100 for manufacturing a secondary battery applied to the method for manufacturing a secondary battery according to the aforementioned embodiment of the present invention.

[0093] Therefore, in the description of the coupling clip 100 for manufacturing a secondary battery according to the present embodiment, contents overlapping with those of the coupling clip according to the previous embodiment of the present invention will be omitted or briefly described, and differences will be mainly described.

[0094] In more detail, the inner portion 140 of the coupling clip 100 may be made of a rubber material, and the outer portion 150 may be made of plastic. Here, the inner portion 140 faces the electrode lead 30, and the outer portion 150 is disposed on the opposite side of the inner portion 140 without facing the electrode lead 30. Therefore, the inner portion 140 is made of a rubber material so that when the coupling clip 100 contacts or couples with the electrode lead 30, the electrode lead 30 or the battery 1 is not damaged.

[0095] In addition, the rubber material may be, for example, synthetic rubber or silicone rubber. Here, since the inner portion 140 is made of silicone rubber, which is an insulating material and a highly heat-resistant material, during the movement of the battery 1, when the clamp Z clamps the electrode lead 30 combined with the combining clip 100, the electrode lead 30 and the clamp Z may be insulated from each other, and when the battery 1 generates heat, the combining clip 100 in contact with the electrode lead 30 may fix the electrode lead 30 without being damaged.

[0096] The fixing surfaces 141 and 142 of the coupling clip 100 face both sides of the electrode lead 30 and are formed as flat surfaces, respectively. Therefore, when the coupling clip 100 is coupled to the electrode lead 30, the bent portion of the electrode lead 30 may be flattened.

[0097] The two side portions 110 and 120 of the coupling clip 100 may include: one side portion 110 having a first coupling portion 160 at an end portion; and the other side portion 120 having a second coupling portion 170 coupled to the first coupling portion 160 at an end portion.

[0098] A folding portion 130 may be formed at a central portion in a length direction of the coupling clip 100 so that the two side portions 110 and 120 can be folded.

[0099] Here, the coupling clip 100 has a cutout portion 131 formed at the outer side of the central portion so that the two side portions 110 and 120 are folded around the inner side of the central portion. Here, when the two side portions 110 and 120 are folded around the folding portion 130 provided at the inner side of the central portion, the coupling clip 100 may be folded in a direction in which one side portion 110 and the other side portion 120 are close to each other. Here, the coupling clip 100 may be provided to be folded in a manner such that The shape surrounds the electrode lead 30.

[0100] In addition, when the two side portions 110 and 120 are folded around the folding portion 130 , the folded state may be fixed by the first and second coupling portions 160 and 170 coupled to each other and then may be coupled to the electrode lead 30 .

[0101] The first coupling portion 160 includes a first protrusion 161, and the second coupling portion 170 includes a second protrusion 171. Therefore, when the two side portions 110 and 120 of the coupling clip 100 are folded around the folding portion 130, the first protrusion 161 and the second protrusion 171 may be staggered and contacted with each other, and then press-fitted with each other. Here, a coupling fitting groove 162 is formed at the side end of the first protrusion 161 in the first coupling portion 160, and a coupling protrusion 172 is formed at a portion corresponding to the coupling fitting groove 162 at the side end of the second protrusion 171 in the second coupling portion 170. As the coupling protrusion 172 is press-fitted into the coupling fitting groove 162, the first coupling portion 160 and the second coupling portion 170 may be coupled to each other.

[0102] A distance h1 between one side portion 110 and the other side portion 120 , a height h3 of the first protrusion 161 , and a height h2 of the second protrusion 171 may be the same.

[0103] When the coupling clip 100 is coupled to the electrode lead 30 , the coupling clip 100 may be formed such that a thickness t1 of the coupling clip 100 is the same as a thickness t2 of the battery case 10 .

[0104] In addition, when the coupling clip 100 is coupled to the electrode lead 30 , the coupling clip 100 may be formed such that both surfaces of the battery case 10 and both surfaces of the coupling clip 100 are disposed on the same plane.

[0105] Therefore, when the jig Z clamps the coupling clip 100 coupled to the electrode lead 30 to move the battery 1, even if the main body 12 of the battery case 10 around the electrode lead 30 is clamped together, the main body 12 can be prevented from being squeezed and damaged.

[0106] Combination clip for manufacturing a secondary battery according to another embodiment

[0107] Hereinafter, a combining clip for manufacturing a secondary battery according to another embodiment of the present invention will be described.

[0108] Reference Figures 10 to 15, a coupling clip 200 for manufacturing a secondary battery according to another embodiment of the present invention is pre-bonded to a portion of the electrode lead 30 of the battery 1 that is clamped by the clamp Z to transfer the battery 1 when manufacturing the secondary battery, and includes an outer portion 250 and an inner portion 240 facing the electrode lead 30, and fixing surfaces 241 and 242 are in close contact with the electrode lead 30. In addition, a coupling groove 210 may be formed in the coupling clip 200 for manufacturing a secondary battery according to another embodiment of the present invention, so that the electrode lead 30 is inserted into the coupling groove 210 to be coupled, and the coupling groove 210 is provided with fixing surfaces 241 and 242 on its top and bottom surfaces. In addition, the coupling clip 200 for manufacturing a secondary battery according to another embodiment of the present invention may further include a support member 280.

[0109] A coupling clip 200 for manufacturing a secondary battery according to another embodiment of the present invention is different from the coupling clip for manufacturing a secondary battery according to the aforementioned embodiment of the present invention in terms of a coupling structure.

[0110] Therefore, in describing the coupling clip 200 for manufacturing a secondary battery according to the present embodiment, contents overlapping with the coupling clip according to the previous embodiment of the present invention will be omitted or briefly described, and differences will be mainly described.

[0111] In more detail, the inner portion 240 of the coupling clip 200 may be made of a rubber material, and the outer portion 250 may be made of plastic. Here, the inner portion 240 faces the electrode lead 30, and the outer portion 250 is disposed on the opposite side of the inner portion 240 without facing the electrode lead 30. Therefore, the inner portion 240 is made of a rubber material so that when the coupling clip 200 contacts or couples with the electrode lead 30, the electrode lead 30 or the battery 1 is not damaged.

[0112] In addition, the rubber material may be, for example, synthetic rubber or silicone rubber. Here, since the inner portion 240 is made of silicone rubber, which is an insulating material and a highly heat-resistant material, during the movement of the battery 1, when the clamp Z clamps the electrode lead 30 combined with the combining clip 200, the electrode lead 30 and the clamp Z may be insulated from each other, and when the battery 1 generates heat, the combining clip 200 in contact with the electrode lead 30 may fix the electrode lead 30 without being damaged.

[0113] The coupling groove 210 may be provided with fixing surfaces 241 and 242 on the top and bottom surfaces thereof, and the electrode lead 30 and a portion of the outer circumferential surface 13 of the battery case 10 where the electrode lead 30 is located are respectively inserted into the coupling groove 210 to be coupled.

[0114] Here, the coupling groove 210 may be formed in a shape corresponding to each of the shape of the electrode lead 30 and the shape of the portion of the outer circumferential surface 13 of the battery case 10 .

[0115] The fixing surfaces 241 and 242 face and closely contact both sides of the electrode lead 30, respectively, and are formed as flat surfaces. Therefore, when the coupling clip 200 is coupled to the electrode lead 30, the bent portion of the electrode lead 30 may be flattened.

[0116] The coupling groove 210 may include: a lead receiving portion 211 into which the electrode lead 30 is inserted; and an outer peripheral surface receiving portion 212 into which the outer peripheral surface 13 of the battery case 10 is inserted. Here, the height a1 of the lead receiving portion 211 may be formed to correspond to the height a2 of the electrode lead 30, and the height b1 of the outer peripheral surface receiving portion 212 may be formed to correspond to the height b2 of the circumferential surface 13 of the battery case 10.

[0117] The support member 280 may be provided in plural to extend in the direction in which the electrode lead 30 is inserted.

[0118] Therefore, the coupling clip 200 may be supported by the support member 280 without being bent or deformed.

[0119] Secondary battery

[0120] The secondary battery according to an embodiment of the present invention may be provided as a secondary battery combined with the combining clips 100 and 200 for manufacturing a secondary battery according to one embodiment or another embodiment of the present invention.

[0121] That is to say, referring to Figure 1 , 4 12 , a secondary battery according to an embodiment of the present invention includes: an electrode assembly 20 ; a battery case 10 accommodating the electrode assembly 20 ; an electrode lead 30 connected to the electrode assembly 10 ; and coupling clips 100 and 200 coupled to the electrode lead 30 .

[0122] Although the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood that the scope of the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention.

[0123] Furthermore, the protective scope of the present invention will be set forth by the accompanying claims.

[0124] [Description of symbols]

[0125] 1: Battery (Cell)

[0126] 10: Battery housing

[0127] 11: Accommodation

[0128] 12: Main body

[0129] 13: Outer surface

[0130] 20: Electrode assembly

[0131] 30: Electrode lead

[0132] 100, 200: Combined clip

[0133] 110: One side part

[0134] 120: Another side

[0135] 130: Folding part

[0136] 131: Cutting part

[0137] 140, 240: Internal

[0138] 141, 142, 241, 242: Fixed surface

[0139] 150, 250: External

[0140] 160: First joint

[0141] 161: The first protrusion

[0142] 162: Combined with the matching groove

[0143] 170: Second joint

[0144] 171: Second protrusion

[0145] 172: Combined protrusions

[0146] 210: Binding slot

[0147] 211: Lead wire accommodation portion

[0148] 212: Outer peripheral surface accommodation portion

[0149] 280: Support

[0150] Z: Clamp.

Claims

1. A method for manufacturing a secondary battery, the method comprising: an accommodating step of accommodating the electrode assembly in a battery case so that electrode leads connected to the electrode assembly protrude to the outside from both sides of the battery case; A sealing step of sealing the outer peripheral surface of the battery case after the housing step to form a battery; a bonding step of bonding a bonding clip to the electrode lead after the sealing step; and a conveying process, after the combining process, the battery is conveyed to the position of the next process after the clamp clamps the combining clamp, wherein, in the bonding process, the two surfaces of the electrode lead are fixed by the bonding clip, a fixing surface of each of the two surfaces of the bonding clip facing the electrode lead is bonded in close contact with the electrode lead and the fixing surface is set as a flat surface, so that the bent portion of the electrode lead is flattened, The coupling clip includes: two side portions, each of which is provided with the fixing surface; and a folding portion formed in a central portion in a length direction of the coupling clip so that the two side portions can be folded around the folding portion.

2. The method according to claim 1, wherein: In the combining process, an inner portion of the combining clip combined with the electrode lead is made of a rubber material, and an outer portion of the combining clip is made of plastic.

3. The method according to claim 1, wherein: In the combining process, the two side portions of the combining clip are folded around the folded portion of the combining clip in a direction in which the two side portions approach each other to fix the two surfaces of the electrode lead.

4. The method according to claim 3, wherein: In the bonding process, the bonding clip is folded to shaped around the electrode lead.

5. The method according to claim 3, wherein: In the coupling process, the coupling clip coupled to the electrode lead has the same thickness as that of the battery case, and both surfaces of the battery case and both surfaces of the coupling clip are disposed on the same plane in a thickness direction.

6. The method according to claim 3, wherein: A first combining portion and a second combining portion combined with each other are respectively formed at the ends of the two side portions of the combining clip to fix the folded state of the combining clip.

7. The method according to claim 1, further comprising: a bonding releasing step of releasing the bonding of the bonding clip bonded to the electrode lead after the conveying step; and The folding step is to fold the side surfaces of the battery casing.

8. A method for manufacturing a secondary battery, the method comprising: an accommodating step of accommodating the electrode assembly in a battery case so that electrode leads connected to the electrode assembly protrude to the outside from both sides of the battery case; A sealing step of sealing the outer peripheral surface of the battery case after the housing step to form a battery; a bonding step of bonding a bonding clip to the electrode lead after the sealing step; and a conveying process, after the combining process, the battery is conveyed to the position of the next process after the clamp clamps the combining clamp, wherein, in the bonding process, a fixing surface of each of two surfaces of the bonding clip facing the electrode lead is bonded in close contact with the electrode lead and the fixing surface is set as a flat surface so that the bent portion of the electrode lead is flattened, A coupling groove is formed in the coupling clip, so that the electrode lead and the portion of the outer peripheral surface of the battery housing where the electrode lead is located are respectively inserted into the coupling groove to be coupled, and the coupling groove is provided with the fixing surface on its top surface and bottom surface, Wherein, in the combining process, the combining groove of the combining clip includes: a lead accommodating portion into which the electrode lead is inserted; and an outer peripheral surface accommodating portion into which the outer peripheral surface of the battery case is inserted, and The lead receiving portion is formed to have a height corresponding to the height of the electrode lead, and the outer peripheral surface receiving portion is formed to have a height corresponding to the height of the outer peripheral surface of the battery case.

9. The method according to claim 8, further comprising: a bonding releasing step of releasing the bonding of the bonding clip bonded to the electrode lead after the conveying step; and The folding step is to fold the side surfaces of the battery casing.

10. A bonding clip for manufacturing a secondary battery, wherein the bonding clip is pre-bonded to a portion of an electrode lead of a battery which is clamped by a clamp to move the battery when manufacturing a secondary battery, The inner portion of the coupling clip facing the electrode lead is made of a rubber material, and the outer portion of the coupling clip is made of plastic, When the bonding clip is bonded to the electrode lead, a fixing surface of the bonding clip facing each of two surfaces of the electrode lead and in close contact with the electrode lead is set as a flat surface so that a bent portion of the electrode lead is flattened. The combination clip comprises: two side portions, each of the two side portions being provided with the fixing surface; and A folded portion is formed at a central portion of the coupling clip in a length direction so that the two side portions can be folded around the folded portion.

11. The coupling clip according to claim 10, The two side portions include: A side portion having a first bonding portion at an end portion; and another side portion having a second coupling portion coupled to the first coupling portion at an end portion, and When the two side portions are folded around the folding portion, the folded state is fixed by the first and second coupling portions coupled to each other, and the two side portions are coupled to the electrode lead.

12. The coupling clip according to claim 11, wherein the first coupling portion comprises a first protrusion, the second coupling portion comprises a second protrusion, and When the two side portions are folded around the folding portion, the first protrusion and the second protrusion are staggered in contact with each other and press-fitted with each other.

13. The coupling clip according to claim 12, wherein a coupling fitting groove is formed at a side end of the first protrusion, and A coupling protrusion press-fitted with the coupling fitting groove is formed at a portion corresponding to the coupling fitting groove at a side end of the second protrusion.

14. A bonding clip for manufacturing a secondary battery, wherein the bonding clip is pre-bonded to a portion of an electrode lead of a battery which is clamped by a clamp to move the battery when manufacturing a secondary battery, The inner portion of the coupling clip facing the electrode lead is made of a rubber material, and the outer portion of the coupling clip is made of plastic, When the bonding clip is bonded to the electrode lead, a fixing surface of the bonding clip facing each of two surfaces of the electrode lead and in close contact with the electrode lead is set as a flat surface so that a bent portion of the electrode lead is flattened. A coupling groove is formed in the coupling clip, so that the electrode lead and the portion of the outer peripheral surface of the battery housing where the electrode lead is located are respectively inserted into the coupling groove and coupled, and the coupling groove is provided with the fixing surface on the top and bottom surfaces thereof, and The coupling groove of the coupling clip comprises: a lead receiving portion into which the electrode lead is inserted; and an outer peripheral surface receiving portion into which the outer peripheral surface of the battery case is inserted, and The lead receiving portion is formed to have a height corresponding to the height of the electrode lead, and the outer peripheral surface receiving portion is formed to have a height corresponding to the height of the outer peripheral surface of the battery case. 15 . The combining clip according to claim 14 , further comprising a plurality of support members extending in a direction in which the electrode leads are inserted. 16 . A secondary battery incorporating the coupling clip for manufacturing a secondary battery according to claim 10 .

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