Secondary battery, method for manufacturing the secondary battery, and pressure device used in the manufacturing method

Abstract

According to an embodiment of the present invention, a method for manufacturing a secondary battery including an electrode assembly and a battery case that houses the electrode assembly and has a sealed end may include a folding step of folding the end, an attaching step of attaching an adhesive member to the folded end, and a pressing step of pressurizing at least a portion of an unattached region of the end where the adhesive member is not attached.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0127431, filed October 5, 2022, and Korean Patent Application No. 10-2023-0060696, filed May 10, 2023, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to a secondary battery, a method for manufacturing the secondary battery, and a pressurizing device used in the manufacturing method. [Background technology]

[0003] Research and development into power generation based on environmentally friendly energy sources is underway to solve the problems of environmental pollution and the energy source issues caused by the depletion of petroleum resources. In particular, research into secondary batteries is being actively conducted, and various aspects of secondary battery materials, structures, processes, and stability are being studied.

[0004] Regarding the structure of secondary batteries, secondary batteries may be classified into pouch-type, prismatic-type, cylindrical-type, etc. depending on the shape of the battery case that houses the electrode assembly. In the case of pouch-type secondary batteries, a sealing part or a degassing part formed at the end occupies space, so a double-side folding (DSF) process may be performed to fold the sealing part or the degassing part for spatial efficiency.

[0005] In conventional technology, taping is performed after folding in the DSF process. When taping the entire end, there are disadvantages in terms of flame propagation retardation of the lead. Furthermore, when taping the end partially, there is a possibility of a difference in thickness between the untaped area and the partially taped area, which can cause physical interference in subsequent processes. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a secondary battery that can prevent physical interference by minimizing the difference in thickness between an untaped area and a taped area, a method for manufacturing the secondary battery, and a pressure device used in the manufacturing method. [Means for solving the problem]

[0007] A method for manufacturing a secondary battery according to an embodiment of the present invention may include a step of folding the end portion, a step of attaching an adhesive member to the folded end portion, and a step of pressurizing at least a portion of an unattached region of the end portion where the adhesive member is not attached.

[0008] According to an embodiment of the present invention, a pressure device may be provided for a secondary battery including an electrode assembly, a battery case that accommodates the electrode assembly and has a sealed end, and an adhesive member attached to a portion of the end. The pressure device may include a body having a variable distance from the end, and a protrusion that protrudes from the body toward the end to apply pressure to at least a portion of a remaining area other than the sealed end.

[0009] A secondary battery according to an embodiment of the present invention may include an electrode assembly, a battery case that accommodates the electrode assembly and has a folded end, and an adhesive member attached to a portion of the folded end, and at least a portion of an unattached portion of the end where the adhesive member is not attached may be crimped. [Effects of the Invention]

[0010] According to a preferred embodiment of the present invention, the thickness difference between regions of a secondary battery can be minimized.

[0011] According to a preferred embodiment of the present invention, it is possible to prevent the end of the secondary battery from protruding unnecessarily.

[0012] According to a preferred embodiment of the present invention, it is possible to minimize physical interference due to differences in thickness and protrusions between regions of a secondary battery.

[0013] According to a preferred embodiment of the present invention, spatial efficiency can be improved when secondary batteries are stacked. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an assembly diagram showing a secondary battery according to an embodiment of the present invention; [Figure 2] 1 is a flowchart illustrating a method for manufacturing a secondary battery according to an embodiment of the present invention. [Figure 3] 1 is a vertical cross-sectional view of a secondary battery according to an embodiment of the present invention; [Figure 4a] 3 is a plan view showing an unattached region of a secondary battery according to an embodiment of the present invention; FIG. [Figure 4b] 1 is a perspective view showing an unattached region of a secondary battery according to an embodiment of the present invention; [Figure 5] 10 is a side view illustrating the state in which the unattached region of the secondary battery according to the first embodiment of the present invention is pressed using a pressing device, viewed from another direction. FIG. [Figure 6] 3 is a plan view showing a pressure region where the pressure device according to the first embodiment of the present invention applies pressure to a secondary battery. FIG. [Figure 7] 10 is a side view illustrating the state in which the unattached region of the secondary battery according to the second embodiment of the present invention is pressed using a pressing device, viewed from another direction. FIG. [Figure 8] FIG. 10 is a plan view showing a pressure region where a pressure device according to a second embodiment of the present invention applies pressure to a secondary battery. [Figure 9]10 is a side view illustrating the state in which the unattached region of the secondary battery according to the third embodiment of the present invention is pressed using a pressing device, viewed from another direction. FIG. [Figure 10] FIG. 10 is a plan view showing a pressure region where a pressure device according to a third embodiment of the present invention applies pressure to a secondary battery. [Figure 11] 10 is a side view illustrating the state in which the unattached region of the secondary battery according to the fourth embodiment of the present invention is pressed using a pressing device, viewed from another direction. FIG. [Figure 12] FIG. 10 is a plan view showing a pressure region where a pressure device according to a fourth embodiment of the present invention presses a secondary battery. DETAILED DESCRIPTION OF THE INVENTION

[0015]

[0030] The present invention will now be described in detail with reference to the accompanying drawings, in which:

[0031] A preferred embodiment of the present invention will be described in detail so that those skilled in the art can easily implement the present invention; however, the present invention may be embodied in various different forms and should not be construed as being limited to the following embodiments.

[0016] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the description or related known technologies that may obscure the gist of the present invention are omitted, and when referring to components in each drawing in this specification, the same or similar reference symbols are used throughout the specification to refer to the same or similar components.

[0017] Furthermore, the terms and words used in this specification and claims should not be interpreted in a limited way to their ordinary and dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principle that an inventor can appropriately define the concept of a term in order to best explain his or her invention.

[0018] FIG. 1 is an assembly diagram showing a secondary battery 1 according to an embodiment of the present invention.

[0019] The secondary battery 1 may include an electrode assembly 2. The electrode assembly 2 may be formed by alternately stacking electrodes and separators. For example, the electrode assembly 2 may be formed by alternately stacking electrodes (e.g., positive and negative electrodes) with separators sandwiched between them. The electrode assembly 2 may include electrode tabs, which may be connected to the positive and negative electrodes, respectively. The electrode assembly 2 may include electrode leads. The electrode leads may be connected to the electrode tabs to electrically connect the electrodes to the outside. The electrode assembly 2 is not limited to the above and may be described in accordance with general content in the related technical field.

[0020] The secondary battery 1 may include a battery case 3. The battery case 3 may house the electrode assembly 2 therein. For example, the battery case 3 may be a pouch-type battery case. The electrode assembly 2 may be housed in the battery case 3, and the ends of the battery case 3 may be sealed.

[0021] The battery case 3 may include a receiving portion 10. The receiving portion 10 may be a portion in which the electrode assembly 2 is received and placed inside the battery case 3. The receiving portion 10 may define a receiving space in which the electrode assembly 2 may be received.

[0022] The battery case 3 may include a cup portion 20. The cup portion 20 may be formed in a shape that surrounds the receiving portion 10. The receiving portion 10 may be formed by forming the cup portion 20.

[0023] The battery case 3 may include a degassing unit 30. The degassing unit 30 is formed on the side of the cup unit 20 and can discharge gas generated inside the cup unit 20 through a degassing hole.

[0024] The battery case 3 may include a termination 40. The degassing unit 30 may be partially cut off from the battery case 3 after the degassing process is performed. By cutting off a portion of the degassing unit 30, the length of the degassing unit 30 may be shortened, which may reduce the volume of the secondary battery 1. The remaining portion of the degassing unit 30 after the degassing process may be the termination 40.

[0025] As described above, cutting a portion of the degassing unit 30 may shorten the length of the degassing unit 30, thereby reducing the volume of the secondary battery 1. However, if the termination 40 is left as is, the space efficiency of the secondary battery 1 may decrease, so it is preferable to fold the termination 40.

[0026] Hereinafter, an embodiment will be described in which the end 40 is folded, an adhesive member is attached to the folded end 40, and at least a portion of the unattached area where the adhesive member is not attached is pressurized, thereby stably increasing the space efficiency of the secondary battery 1.

[0027] 2 is a flowchart showing a method for manufacturing a secondary battery 1 according to an embodiment of the present invention. The flowchart of the method for manufacturing a secondary battery 1 shown in FIG. 2 will be described with reference to FIG. 3, which shows a longitudinal cross-sectional view of the secondary battery 1 from one direction, and FIGS. 4a and 4b, which show a plan view and a perspective view of an unattached region 300 of the secondary battery 1. The above description may be applied equally or similarly to this embodiment.

[0028] The method for manufacturing the secondary battery 1 may include a folding step of folding the termination 40 according to S100.

[0029] The terminal end 40 may be folded multiple times. For example, the terminal end 40 may be folded twice using a double-side folding (DSF) process. Specifically, the terminal end 40 may include a first folding portion 41 and a second folding portion 42. The first folding portion 41 is a portion folded relatively closer to the end of the terminal end 40, and the second folding portion 42 is a portion folded relatively closer to the cup portion 20. After the terminal end 40 is first folded based on the first folding portion 41, the terminal end 40 may be secondly folded based on the second folding portion 42.

[0030] The method for manufacturing the secondary battery 1 may include the step of attaching the adhesive member 100 to the folded end 40 in S200.

[0031] Through the attaching step, the adhesive member 100 may be attached to the secondary battery 1. For example, the adhesive member 100 may be attached to cover a portion of the end 40 and a portion of the cup portion 20. The adhesive member 100 may be attached to the end 40 so that the end 40 is fixed in a folded state toward the cup portion 20.

[0032] The attaching step may include attaching a plurality of adhesive members 100 to the end 40 at a distance from each other. For example, a plurality of adhesive members 100 may be provided, and the plurality of adhesive members 100 may be attached at intervals along the end 40. As a specific example, three adhesive members 100 may be provided, and the three adhesive members 100 may be attached at intervals along the end 40. However, the number of adhesive members 100 is not limited to the above examples.

[0033] The attaching step may form an unattached region 300. For example, when a plurality of adhesive members 100 are attached to the end 40 at a distance from each other, an unattached region 300 where no adhesive member 100 is attached may be formed between the plurality of adhesive members 100.

[0034] 4a, the unattached region 300 may be formed in a portion of the cup portion 20. For example, the unattached region 300 may be formed in the upper portion of the cup portion 20 of the secondary battery 1. Also, referring to FIG. 4b, the unattached region 300 may be formed in a portion of the end 40. For example, the unattached region 300 may be formed in a portion of the side of the end 40.

[0035] The following description of the thickness t of the unattached region 300 may refer to the thickness of the terminal end 40 .

[0036] Before the step of applying pressure to the unattached region 300, the thickness t of the unattached region 300 (or the end 40 corresponding to the unattached region 300) may be thicker than the thickness of the attached region to which the adhesive member 100 is attached. The thickness t may be the thickness t of the end 40 in a state in which the end 40 is folded multiple times. The thickness t of the end 40 may be the thickness toward the lateral side. The thickness in the following may be the thickness t of the unattached region 300.

[0037] The attaching step may include attaching an adhesive material having a melting point higher than a temperature above room temperature.

[0038] The method for manufacturing the secondary battery 1 may include a pressurizing step S300 of pressurizing at least a portion of the unattached region 300 of the termination 40 to which the adhesive member 100 is not attached.

[0039] The pressurizing step may include a process of pressurizing a portion of the secondary battery 1 using a pressurizing device 200. The pressurizing device 200 is movable relative to the secondary battery 1. The pressurizing device 200 may include a protruding portion (e.g., protrusion 220 in FIG. 5 ) so as to be able to pressurize at least a portion of the unattached region 300 of the secondary battery 1.

[0040] The pressurizing step may include a process of applying pressure in a direction that reduces the thickness t of a portion of the secondary battery 1 using the pressurizing device 200. For example, the pressurizing device 200 may pressurize the portion of the secondary battery 1 in a direction toward the cup portion 120. In other words, the pressurizing device 200 may pressurize the unattached region 300 of the end terminal 40 near the end terminal 40 of the secondary battery 1.

[0041] The pressing step may include a process of pressing at least a portion of the unattached region 300 formed between the plurality of adhesive members 100 using a pressing device 200 .

[0042] The pressing step may include a process of pressing the at least a portion of the area using a pressing device 200 while spacing the area from the attachment area where the adhesive member 100 is attached.

[0043] The pressurizing step may include applying the pressure to the at least a portion of the region at a temperature above room temperature using a pressurizing device 200 .

[0044] After the pressure application step, the thickness t of the unattached region 300 (or the end 40 corresponding to the unattached region 300) may not be thicker than the thickness of the attached region where the adhesive member 100 is attached. For example, by applying pressure in a direction that reduces the thickness t using the pressure device 200, the thickness t of the unattached region 300 may correspond to the thickness of the attached region where the adhesive member 100 is attached, or may be thinner than the thickness of the attached region where the adhesive member 100 is attached.

[0045] The corresponding thicknesses may include the same thickness, or may include thicknesses that are not the same but extend outward within a small range.

[0046] In other words, after the pressurizing step, the unattached region 300 may not protrude outward from the attached region where the adhesive member 100 is attached. This prevents some regions (e.g., the unattached region 300) of the terminal end 40 of the secondary battery from protruding unnecessarily.

[0047] 5 is a side view illustrating the state in which the unattached region 300 of the secondary battery 1 according to the first embodiment of the present invention is pressed using the pressing device 200 from another direction, and FIG. 6 is a plan view showing the pressing region 400 where the pressing device 200 presses the secondary battery 1 according to the first embodiment of the present invention. The above description may be applied in the same or similar manner to this embodiment.

[0048] 5 and 6, the pressure device 200 may apply pressure to the unattached region 300 on the end 40 side in a direction that reduces the thickness t of the unattached region 300 beside the secondary battery 1.

[0049] The pressure device 200 can apply pressure to the secondary battery 1. The secondary battery 1 includes an electrode assembly 2 and a battery case 3 that houses the electrode assembly 2 and has a sealed end 40, and an adhesive member 100 may be attached to a portion of the end 40.

[0050] The pressure device 200 may include a body 210. For example, the distance of the body 210 relative to the terminal end 40 may be variable. In other words, the body 210 is movable relative to the terminal end 40.

[0051] The pressure device 200 may include protrusions 220. For example, the protrusions 220 may protrude from the main body 210 toward the end 40 so as to apply pressure to at least a portion of the remaining area (or unattached area 300) other than the partial area (or attached area) to which the adhesive member 100 is attached. The protrusions 220 may protrude in a predetermined pattern from the main body 210. For example, the predetermined pattern may be determined by the pressure area (e.g., pressure area 400) of the unattached area 300 that is to be pressed by the protrusions 220.

[0052] The pressure device 200 may be provided so as to be heatable. For example, the pressure device 200 may be provided so that the protrusion 220 provided by applying pressure to at least a portion of the unattached region 300 is heated to a temperature at least above room temperature.

[0053] The protrusions 220 of the pressure device 200 may be protruded in a pattern that applies pressure to at least the areas between the adhesive members 100 in the unattached region 300. For example, the protrusions 220 may be protruded in a pattern as shown in Fig. 5 so that the areas between the adhesive members 100 (or the pressure area 400) in the unattached region 300 of the end 40 are centrally pressurized. Specifically, the protrusions 220 may be protruded in a pattern that applies pressure to the areas between the adhesive members 100.

[0054] The region between the adhesive members 100 (or the pressurized region 400) may be the region where the difference in thickness between the unattached region 300 and the attached region where the adhesive member 100 is attached is the largest. In this case, the protrusion 220 applies pressure to the region between the adhesive members 100, thereby making the thickness of the unattached region 300, which has the largest difference in thickness, and the thickness of the attached region where the adhesive member 100 is attached, uniform.

[0055] The pressure device 200 may apply pressure to the pressure region 400 while at least the protruding portion 220 of the pressure device 200 is heated to a temperature above room temperature. When the pressure is applied while the protruding portion 220 is heated, the thickness of the unattached region 300, which has the largest thickness difference, and the attached region where the adhesive member 100 is attached can be more effectively made uniform.

[0056] As described above, the thickness of the unattached region 300 and the attached region can be uniform, and spatial efficiency can also be improved when the thickness t of the unattached region 300 is thinner than the thickness of the attached region of the adhesive material 100.

[0057] A portion of the unattached region 300 of the secondary battery 1 pressurized by the pressurizing device 200 may be thermocompression bonded. For example, at least a portion of the unattached region 300 of the terminal end 40 to which the adhesive member 100 is not attached (e.g., a region between the adhesive members 100) may be heated and pressed by the protrusions 220 protruding in a predetermined pattern, thereby being thermocompression bonded.

[0058] The heating and pressurizing causes the area between the adhesive members 100 in the unattached area 300 to be thermocompressed, so that the thickness of at least the area between the adhesive members 100 in the unattached area 300 where the adhesive members 100 are not attached in the folded end 40 may correspond to or be thinner than the thickness of the attached area where the adhesive members 100 are attached.

[0059] As described above, it is possible to minimize the occurrence of physical interference due to differences in thickness between regions of the secondary battery 1, and to improve spatial efficiency when the secondary batteries 1 are stacked.

[0060] 7 is a side view illustrating the state in which the unattached region 300a of the secondary battery 1a is pressed by the pressing device 200a according to the second embodiment of the present invention, from another direction, and FIG. 8 is a plan view illustrating the pressing region 400a where the pressing device 200a presses the secondary battery 1a according to the second embodiment of the present invention. The above description may be applied in the same or similar manner to this embodiment.

[0061] The protrusions 220a of the pressure device 200a may be formed in a pattern that at least presses the unattached region 300a. For example, the protrusions 220a may be formed in a pattern as shown in FIG. 7 so that the entire unattached region 300a of the end 40a is pressed. Specifically, the protrusions 220a may be formed in a pattern that corresponds to the shape of the unattached region 300a so that the entire unattached region 300a is pressed. The pressure region 400a may be a region that corresponds to the unattached region 300a. By the protrusions 220a pressing the pressure region 400a, the difference in thickness between the unattached region 300a and the attached region where the adhesive member 100a is attached can be minimized.

[0062] The pressure device 200a may apply pressure to the pressure region 400a while at least the protrusions 220a are heated. When pressure is applied while the protrusions 220a are heated, the difference in thickness between the unattached region 300a and the attached region where the adhesive material 100a is attached can be more effectively reduced.

[0063] The secondary battery 1a pressurized by the pressurizing device 200a may have the unattached region 300a thermocompression-bonded. For example, the unattached region 300a of the terminal end 40a, to which the adhesive member 100a is not attached, may be heated and pressed by the protrusion 220a protruding in a predetermined pattern, thereby being thermocompression-bonded.

[0064] As the unattached region 300a is thermocompressed by the heating and pressure, the thickness of the unattached region 300a of the folded end 40a to which the adhesive member 100a is not attached may correspond to or be thinner than the thickness of the attached region to which the adhesive member 100a is attached.

[0065] As described above, it is possible to minimize the occurrence of physical interference due to differences in thickness between regions of the secondary battery 1a, and to improve spatial efficiency when the secondary batteries 1a are stacked.

[0066] 9 is a side view illustrating the state in which the unattached region 300b of the secondary battery 1b according to the third embodiment of the present invention is pressed by the pressing device 200b from another direction, and FIG. 10 is a plan view illustrating the pressing region 400b where the pressing device 200b presses the secondary battery 1a according to the third embodiment of the present invention. The above description may be applied in the same or similar manner to this embodiment.

[0067] As described above, the pressing step, which includes a process of pressing at least a portion of the unattached region 300b at a distance from the attached region to which the adhesive member 100b is attached, will be described.

[0068] The protrusions 220b of the pressure device 200b may be protruded in a pattern that applies pressure to at least the unattached region 300b and spaced apart from the attached region to which the adhesive member 100b is attached. For example, the protrusions 220b may be protruded in a pattern as shown in FIG. 9 so that a portion of the unattached region 300b at the end 40b is compressed. Specifically, the protrusions 220b may be protruded in a pattern that applies pressure to a portion of the unattached region 300b and does not apply pressure to a portion of the unattached region 300b adjacent to the adhesive member 100b. The pressure region 400b may be a region included in the unattached region 300b. By applying pressure to the pressure region 400b by the protrusions 220b, the difference in thickness between the pressure region 400b and the attached region to which the adhesive member 100b is attached can be minimized.

[0069] The pressure device 200b can apply pressure to the pressure region 400b while at least the protrusions 220b are heated. When pressure is applied while the protrusions 220b are heated, the difference in thickness between the pressure region 400b and the adhesive region where the adhesive material 100b is attached can be more effectively reduced.

[0070] The secondary battery 1b pressurized by the pressurizing device 200b may have a pressurized region 400b of the unattached region 300b thermocompression-bonded. For example, the unattached region 300b of the terminal end 40b to which the adhesive member 100b is not attached may be thermocompression-bonded, and the region of the unattached region 300b corresponding to the pressurized region 400b may be heated and pressed by the protrusion 220b protruding in a predetermined pattern to be thermocompression-bonded.

[0071] As the pressure region 400b is thermocompressed by the application of heat and pressure, the thickness of the pressure region 400b of the folded end 40b may correspond to or be thinner than the thickness of the attachment region where the adhesive member 100 is attached.

[0072] As described above, it is possible to minimize the occurrence of physical interference due to differences in thickness between regions of the secondary battery 1b, and to improve spatial efficiency when the secondary batteries 1b are stacked.

[0073] 11 is a side view illustrating the state in which the unattached region 300c of the secondary battery 1c is pressed by the pressing device 200c according to the fourth embodiment of the present invention, from another direction, and FIG. 12 is a plan view illustrating the pressing region 400c where the pressing device 200c presses the secondary battery 1c according to the fourth embodiment of the present invention. The above description may be applied in the same or similar manner to this embodiment.

[0074] As described above, the pressing step, which includes a process of pressing at least a portion of the unattached region 300c and the attached region to which the adhesive member 100c is attached, will now be described.

[0075] The protrusions 220c of the pressure device 200c may be protruded in a pattern that applies pressure to at least the unattached region 300c and a portion of the attached region where the adhesive member 100c is attached. For example, the protrusions 220c may be protruded in a pattern as shown in FIG. 11 so that the entire unattached region 300c of the end 40c is pressed, and also a region of the adhesive member 100c adjacent to the unattached region 300c is pressed. Specifically, the protrusions 220c may be protruded in a pattern that covers the unattached region 300c and a portion of the region where the adhesive member 100c is attached, when viewed from above. The pressure region 400c may be a region that includes the unattached region 300c. By applying pressure to the pressure region 400c with the protrusions 220c, the difference in thickness between the unattached region 300c and the attached region where the adhesive member 100c is attached can be minimized.

[0076] The pressure device 200c can apply pressure to the pressure region 400c while at least the protrusions 220c are heated. When the pressure is applied while the protrusions 220c are heated, the difference in thickness between the unattached region 300c and the attached region where the adhesive material 100c is attached can be more effectively reduced.

[0077] As described above, when the protrusion 220c of the pressure device 200c presses a portion of the adhesive member 100c, the adhesive member 100c may have a melting point higher than a temperature above room temperature to prevent damage to the adhesive member 100c. In other words, the adhesive member 100c may have a melting point higher than a temperature corresponding to the heated state of the protrusion 220c.

[0078] The secondary battery 1c pressurized by the pressurizing device 200c may be thermocompression-bonded at the pressurized region 400c. For example, at least the unattached region 300c of the terminal end 40c to which the adhesive member 100c is not attached may be thermocompression-bonded, and the region corresponding to the pressurized region 400c may be thermocompression-bonded by being heated and pressurized by the protrusion 220c protruding in a predetermined pattern.

[0079] As the pressure region 400c is thermocompressed by the application of heat and pressure, the thickness of the pressure region 400c of the folded end 40c may correspond to or be thinner than the thickness of the attachment region where the adhesive member 100c is attached.

[0080] As described above, it is possible to minimize the occurrence of physical interference due to differences in thickness between regions of the secondary battery 1c, and to improve spatial efficiency when the secondary batteries 1c are stacked.

[0081] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the technical spirit of the present invention and the scope of the claims set forth below by a person having ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0082] 1, 1a, 1b, 1c: Secondary battery 2: Electrode assembly 3: Battery case 10: Storage unit 20: Cup section 30: Degassing section 40: Termination 41: First folding section 42: Second folding section 100, 100a, 100b, 100c: Adhesive material 200, 200a, 200b, 200c: pressure device 210, 210a, 210b, 210c: Main body 220, 220a, 220b, 220c: Protrusion 300, 300a, 300b, 300c: Unattached area 400, 400a, 400b, 400c: pressure area

Claims

1. A method for manufacturing a secondary battery including an electrode assembly and a battery case that houses the electrode assembly and has a sealed end, comprising: a folding step of folding the end; a step of attaching an adhesive member to the folded end; and A method for manufacturing a secondary battery, comprising: applying pressure to at least a portion of an unattached region of the terminal end where the adhesive member is not attached.

2. The attaching step comprises: and attaching a plurality of adhesive members to the end at intervals, The pressurizing step comprises: The method for manufacturing a secondary battery according to claim 1 , further comprising the step of applying pressure to at least a portion of the unattached region formed between the plurality of adhesive members.

3. The pressurizing step comprises: The method of claim 1 , further comprising the step of pressing the at least one region at a distance from the attachment region to which the adhesive member is attached.

4. The pressurizing step comprises: The method for manufacturing a secondary battery according to claim 1 , further comprising the step of pressurizing the at least partial region at a temperature above room temperature.

5. The pressurizing step comprises: The method for manufacturing a secondary battery according to claim 1 , further comprising the step of pressurizing at least a portion of the unattached region and the attached region to which the adhesive member is attached.

6. The pressurizing step comprises: The method for manufacturing a secondary battery according to claim 5 , further comprising the step of pressurizing at a temperature above room temperature.

7. The attaching step comprises: The method of claim 6 , further comprising the step of attaching an adhesive member having a melting point higher than the temperature above room temperature.

8. A pressurizing device for pressurizing a secondary battery including an electrode assembly and a battery case that accommodates the electrode assembly and has a sealed end, the battery case having an adhesive member attached to a portion of the end, a body having a variable distance to said terminal end; a pressure device including a protrusion protruding from the body toward the terminal end so as to apply pressure to at least a portion of the remaining area other than the partial area.

9. 9. The pressure device according to claim 8, wherein the protrusion is adapted to be heated.

10. The protrusion is 10. The pressure device according to claim 8 or 9, wherein the body is protruded in a predetermined pattern.

11. electrode assembly; a battery case containing the electrode assembly and having a folded end; and an adhesive member attached to a portion of the folded end, A secondary battery in which at least a portion of the terminal end in an unattached region to which the adhesive member is not attached is compressed.

12. The secondary battery of claim 11 , wherein a thickness of an unattached region of the folded end where the adhesive member is not attached corresponds to a thickness of the partial region where the adhesive member is attached.

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