Secondary battery activation device and secondary battery manufacturing method using same

Abstract

The present invention relates to a secondary battery activation device capable of effectively removing gas generated inside a secondary battery cell during a secondary battery activation process, and a method for manufacturing a secondary battery using the same. A secondary battery activation device according to an embodiment of the present invention is, It includes an upper pressure section comprising an upper pressure plate and a plurality of first elastic pressure members formed on the lower surface of the upper pressure plate; and a lower pressure section comprising a lower pressure plate formed opposite to the upper pressure plate and a plurality of second elastic pressure members formed on the upper surface of the lower pressure plate.

Description

Technology Field

[0001] The present invention relates to a secondary battery activation device capable of effectively removing gas generated inside a secondary battery cell during a secondary battery activation process, and a method for manufacturing a secondary battery using the same. Background Technology

[0003] As technology development and demand for mobile devices increase, the demand for batteries as an energy source is rapidly rising, and accordingly, much research is being conducted on batteries capable of meeting various requirements.

[0004] In terms of battery shape, there is high demand for prismatic and pouch-type rechargeable batteries, which can be applied to products such as mobile phones due to their thin thickness; in terms of materials, there is high demand for lithium-ion batteries, such as lithium-ion polymer batteries, which possess advantages such as high energy density, discharge voltage, and output stability.

[0005] In addition, secondary batteries are classified according to the structure of the electrode assembly comprising a positive electrode, a separator, and a negative electrode. Representative examples include a jelly-roll (wound-type) electrode assembly in which long sheet-type positive and negative electrodes are wound with a separator interposed; a stack-type (stacked-type) electrode assembly in which multiple positive and negative electrodes cut into units of a predetermined size are sequentially stacked with a separator interposed; and a stack-folding type electrode assembly in which bi-cells or full cells, each consisting of a predetermined unit of positive and negative electrodes stacked with a separator interposed, are wound.

[0006] Recently, pouch-type batteries with a structure in which a stacked or stack-folding electrode assembly is embedded in a pouch-type battery case made of aluminum laminate sheets are attracting a lot of attention due to reasons such as low manufacturing costs, small weight, and easy shape deformation, and their usage is gradually increasing.

[0007] Most secondary batteries, including these pouch-type batteries, undergo a process of activating the battery through charging and discharging during the manufacturing of the battery cell. Therefore, to manufacture the final battery cell, the gas generated during the activation process must be removed, and this is called the degas process.

[0009] FIG. 1 is a cross-sectional view schematically illustrating a secondary battery activation device according to the prior art, and FIG. 2 and 3 are images exemplarily showing the results of performing a high-temperature pressurized activation process with a secondary battery activation device according to the prior art.

[0010] Referring to FIG. 1, a secondary battery activation device according to the prior art is composed of a plate-shaped upper pressure plate (1) and a lower pressure plate (2). The plate-shaped upper pressure plate (1) and the lower pressure plate (2) are heated with the secondary battery (B) in between, and both sides of the secondary battery (B) are pressurized to a high temperature to remove gas generated by charging from the electrode interface, thereby activating the secondary battery (B).

[0011] However, when manufacturing the electrode constituting the secondary battery (B), when coating the electrode material in a slurry state, a slight flow phenomenon occurs at the end of the electrode due to the fluidity of the slurry until it dries, causing the electrode thickness to become thin (so-called sliding region of the electrode), resulting in a thickness difference at the end of the electrode and causing thickness imbalance of the secondary battery (B). (Refer to part C of FIG. 1)

[0012] In this state, when the activation process is carried out using the secondary battery activation device of FIG. 1, as exemplified in FIG. 2, the gas generated by the activation process accumulates at the end of the secondary battery (B) and is located at the interface of each electrode. However, in the part where the thickness of the secondary battery (B) becomes thin (part C in FIG. 1), the pressurizing force of the pressurizing plates (1, 2) is not transmitted, so a gas trapping phenomenon occurs as shown in FIG. 3. This gas trapping phenomenon causes a problem of non-uniform charging. Prior art literature

[0014] Korean Registered Patent No. 1650858 The problem to be solved

[0015] The present invention aims to provide a secondary battery activation device and a method for manufacturing a secondary battery using the same, wherein, during the secondary battery activation process, even if there are locally thin parts of the secondary battery cell, the secondary battery cell is uniformly pressurized so that gas generated during the activation process is not locally trapped within the cell. means of solving the problem

[0017] A secondary battery activation device according to an embodiment of the present invention is,

[0018] It includes an upper pressure section comprising an upper pressure plate and a plurality of first elastic pressure members formed on the lower surface of the upper pressure plate; and a lower pressure section comprising a lower pressure plate formed opposite to the upper pressure plate and a plurality of second elastic pressure members formed on the upper surface of the lower pressure plate.

[0019] In a secondary battery activation device according to an embodiment of the present invention, the first elastic pressing member comprises an elastic member and a pressing block, wherein the upper end of the elastic member is fixedly formed on the lower surface of the upper pressing plate and the lower end of the elastic member is fixedly formed on the pressing block. Additionally, the second elastic pressing member comprises an elastic member and a pressing block, wherein the lower end of the elastic member is fixedly formed on the upper surface of the lower pressing plate and the upper end of the elastic member is fixedly formed on the pressing block.

[0020] In a secondary battery activation device according to an embodiment of the present invention, the elastic member may be a spring.

[0021] In a secondary battery activation device according to an embodiment of the present invention, the pressure block may have an elastic surface formed on the surface that presses the secondary battery.

[0022] In a secondary battery activation device according to an embodiment of the present invention, each of the pressure blocks constituting the first and second elastic pressure members may be formed with the same size over the entire pressure area that presses the secondary battery.

[0023] In a secondary battery activation device according to an embodiment of the present invention, among the pressure blocks constituting the first and second elastic pressure members, the pressure blocks that pressure a first region where the electrode thickness of the secondary battery is constant are formed with a first size, and the pressure blocks that pressure a second region where the electrode thickness of the secondary battery becomes thin are formed with a second size smaller than the first size.

[0024] In a secondary battery activation device according to an embodiment of the present invention, the pressurizing blocks that pressurize the second region may be formed with a second size smaller than the first size, and may be formed to become progressively smaller toward the end of the secondary battery.

[0025] In a secondary battery activation device according to an embodiment of the present invention, the pressurizing blocks may be formed in a stripe shape.

[0026] In a secondary battery activation device according to an embodiment of the present invention, the pressurizing blocks may be formed in a grid shape.

[0028] A method for manufacturing a secondary battery according to an embodiment of the present invention is performed using the aforementioned secondary battery activation device in the step of activating the secondary battery.

[0030] Specific details of embodiments according to various aspects of the present invention are included in the following detailed description. Effects of the invention

[0032] According to an embodiment of the present invention, during the secondary battery activation process, even if the thickness of the secondary battery cell is not uniform and there are locally thin parts, the entire surface of the secondary battery cell is uniformly pressed, thereby preventing gas generated inside the secondary battery cell from being trapped inside the electrode assembly. Brief explanation of the drawing

[0034] FIG. 1 is a cross-sectional view schematically illustrating a secondary battery activation device according to the prior art. Figures 2 and 3 are images exemplarily showing the results of performing a high-temperature pressurized activation process with a secondary battery activation device according to the prior art. FIG. 4 is a cross-sectional view schematically illustrating a secondary battery activation device according to a first embodiment of the present invention. Figure 5 is a drawing showing a pressure block formed in a stripe shape. Figure 6 is a drawing showing a pressure block formed in a grid shape. FIG. 7 is a cross-sectional view schematically illustrating a secondary battery activation device according to a second embodiment of the present invention. FIGS. 8 to 11 are drawings showing pressure blocks formed in various shapes. FIG. 12 is a cross-sectional view schematically illustrating a secondary battery activation device according to a third embodiment of the present invention. FIGS. 13 to 16 are drawings showing pressure blocks formed in various shapes. FIG. 17 is a flowchart illustrating a method for manufacturing a secondary battery using a secondary battery activation device according to embodiments of the present invention. Specific details for implementing the invention

[0035] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0036] The terms used in this invention are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this invention, terms such as "comprising" or "having" are intended to specify the existence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Hereinafter, a secondary battery activation device according to an embodiment of the present invention and a method for manufacturing a secondary battery using the same will be described with reference to the drawings.

[0038] First, a secondary battery activation device according to a first embodiment of the present invention will be described with reference to FIGS. 4 to 6. FIG. 4 is a cross-sectional view schematically illustrating a secondary battery activation device according to a first embodiment of the present invention, FIG. 5 is a drawing illustrating a pressure block formed in a stripe shape, and FIG. 6 is a drawing illustrating a pressure block formed in a grid shape.

[0039] As illustrated in FIG. 4, a secondary battery activation device (100) according to the first embodiment of the present invention includes an upper pressurizing part (110) and a lower pressurizing part (120). The upper pressurizing part (110) applies high-temperature pressurization to the upper surface of the secondary battery (B), and the lower pressurizing part (120) applies high-temperature pressurization to the lower surface of the secondary battery (B).

[0040] The upper pressure member (110) includes an upper pressure plate (111) and a plurality of first elastic pressure members (112).

[0041] The upper pressure plate (111) is formed in a predetermined shape, for example, a rectangular plate shape, and a plurality of first elastic pressure members (112) may be formed at equal intervals on the lower surface of the upper pressure plate (111). Each of the first elastic pressure members (112) includes an elastic member (112a) and a pressure block (112b).

[0042] The elastic member (112a) can be a material capable of contracting / expanding by an external force, such as a spring or synthetic rubber. In the drawing, the elastic member (112a) is exemplified as a spring. The upper end of the elastic member (112a) is fixedly formed on the lower surface of the upper pressure plate (111), and the lower end of the elastic member (112a) is fixedly formed on the pressure block (112b).

[0043] The pressure block (112b) may be formed in a stripe shape having a predetermined width and length as illustrated in FIG. 5. Alternatively, the pressure block (112b) may be formed in a grid shape having a predetermined area as illustrated in FIG. 6.

[0044] As shown in FIG. 5, when the pressure block (112b) is formed in a stripe shape, there is an advantage of being relatively easy to manufacture. On the other hand, as shown in FIG. 6, when the pressure block (112b) is formed in a grid shape, although manufacturing is relatively complex, there is an advantage of being able to apply uniform pressure even to minute thickness changes of the secondary battery (B).

[0045] The pressure block (112b) is formed of a solid material overall, but an elastic surface made of rubber or the like with a certain hardness may be formed on the surface that presses the secondary battery (B). The elastic surface prevents the surface of the secondary battery (B) from being damaged by the pressure of the pressure block (112b).

[0046] The lower pressure member (120) includes a lower pressure plate (121) facing the upper pressure plate (111) and a plurality of second elastic pressure members (122).

[0047] The lower pressure plate (121) is formed in a shape corresponding to the upper pressure plate (111), and a plurality of second elastic pressure members (122) may be formed at equal intervals on the lower surface of the lower pressure plate (121). Each of the second elastic pressure members (122) includes an elastic member (122a) and a pressure block (122b).

[0048] Since the elastic member (122a) and the pressure block (122b) are substantially identical to the aforementioned elastic member (112a) and pressure block (112b), a repeated description is omitted.

[0050] According to the secondary battery activation device of the first embodiment of the present invention configured as such, the secondary battery can be uniformly pressed throughout regardless of the flatness of the secondary battery during the activation process of a pouch-type battery or a prismatic battery.

[0051] In particular, even if there are locally thin parts of the secondary battery, pressure can be applied uniformly by the spring elastic body, enabling a more uniform activation reaction than in the past.

[0052] The activation process, carried out under uniform pressure, enables the removal of generated activation gas without local trapping, thereby making it possible to manufacture a secondary battery with a uniform charge state.

[0054] Next, a secondary battery activation device according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 11. FIG. 7 is a cross-sectional view schematically illustrating a secondary battery activation device according to a second embodiment of the present invention, and FIGS. 8 to 11 are drawings illustrating a pressurizing block formed in various shapes.

[0055] As illustrated in FIG. 7, a secondary battery activation device (200) according to a second embodiment of the present invention includes an upper pressurizing part (210) and a lower pressurizing part (220). In this embodiment, except for the pressurizing blocks (212b, 222b), the remaining configuration is substantially the same as the first embodiment described above, so a repeated description is omitted.

[0056] In this embodiment, the pressure block (212b, 222b) is formed with a different size depending on the area where the secondary battery (B) is pressured. Specifically, the pressure block (212b, 222b) that pressures the first area (A1) where the electrode thickness of the secondary battery (B) is constant is formed with a first size, and the pressure block (212b, 222b) that pressures the second area (A2, sliding area) where the electrode thickness of the secondary battery (B) becomes thin is formed with a second size smaller than the first size. The specific numerical values ​​of the first size and the second size can be set according to the size and characteristics of the secondary battery (B).

[0057] The smaller the size of the pressure block (212b, 222b), the more uniformly it can apply pressure even with minute changes in thickness. Since there is almost no change in electrode thickness in the first region, there is no need for the size of the pressure block (212b, 222b) to be small, and since a change in electrode thickness occurs in the second region, it is preferable for the size of the pressure block (212b, 222b) to be formed with a second size that is smaller than the first size of the first region.

[0058] In this way, by varying the size of the pressure blocks (212b, 222b) according to the pressure area, the number of pressure blocks (212b, 222b) and elastic members (212a, 222a) that elastically support the pressure blocks required for the device design can be optimized. That is, the number of pressure blocks (212b, 222b) and elastic members (212a, 222a) required for the first area can be reduced.

[0060] FIG. 8 illustrates that the pressure block (212b, 222b) of the present embodiment is formed in a stripe shape having a predetermined width and length, and FIG. 9 illustrates that it is formed in a grid shape having a predetermined area.

[0061] As shown in FIG. 8, when the pressure block (212b, 222b) is formed in a stripe shape, there is an advantage of being relatively easy to manufacture. On the other hand, as shown in FIG. 9, when the pressure block (212b, 222b) is formed in a grid shape, although manufacturing is relatively complex, there is an advantage of being able to apply uniform pressure even with minute thickness variations across the entire area of ​​the secondary battery (B).

[0062] FIGS. 10 and FIGS. 11 illustrate the arrangement of pressure blocks (212b, 222b) of a secondary battery activation device when electrode leads of a secondary battery (B) are formed on both sides. FIG. 10 shows the case where the pressure blocks (212b, 222b) have a stripe shape, and FIG. 11 shows the case where the pressure blocks (212b, 222b) have a grid shape.

[0063] Referring to FIGS. 10 and FIGS. 11, a secondary battery having electrode leads formed on both sides has a second region formed on both sides, so a pressure block of a second size is formed on both sides and a pressure block of a first size is formed in the center.

[0065] Next, a secondary battery activation device according to a third embodiment of the present invention will be described with reference to FIGS. 12 to 16. FIG. 12 is a cross-sectional view schematically illustrating a secondary battery activation device according to a third embodiment of the present invention, and FIGS. 13 to 16 are drawings illustrating a pressurizing block formed in various shapes.

[0066] As illustrated in FIG. 12, a secondary battery activation device (300) according to the third embodiment of the present invention includes an upper pressurizing part (310) and a lower pressurizing part (320). In this embodiment, except for the pressurizing blocks (312b, 322b), the remaining configuration is substantially the same as the first embodiment described above, so a repeated description is omitted.

[0067] In this embodiment, the pressure block (312b, 322b) is formed with a different size depending on the area where the secondary battery (B) is pressured. Specifically, the pressure block (312b, 322b) that pressures the first area (A1) where the electrode thickness of the secondary battery (B) is constant is formed with a first size, and the pressure block (312b, 322b) that pressures the second area (A2, sliding area) where the electrode thickness of the secondary battery (B) becomes thin is formed with a second size smaller than the first size, and is formed to become progressively smaller towards the end of the secondary battery.

[0068] The electrode thickness in the second region does not decrease at a constant rate, and the magnitude of the decrease in electrode thickness may increase as it approaches the end of the secondary battery (B). Therefore, in this embodiment, the size of the pressure block (312b, 322b) is gradually reduced as it approaches the end of the secondary battery, so that even if the change in electrode thickness in the second region occurs gradually, a uniform pressure can be provided throughout the second region.

[0070] FIG. 13 illustrates that the pressure block (312b, 322b) of the present embodiment is formed in a stripe shape having a predetermined width and length, and FIG. 14 illustrates that it is formed in a grid shape having a predetermined area.

[0071] As shown in FIG. 13, when the pressure block (312b, 322b) is formed in a stripe shape, there is an advantage of being relatively easy to manufacture. On the other hand, as shown in FIG. 14, when the pressure block (312b, 322b) is formed in a grid shape, although manufacturing is relatively complex, there is an advantage of being able to apply uniform pressure even to minute thickness variations across the entire area of ​​the secondary battery (B).

[0072] FIGS. 15 and 16 illustrate the arrangement of pressure blocks (312b, 322b) of a secondary battery activation device when electrode leads of a secondary battery (B) are formed on both sides. FIG. 15 shows the case where the pressure blocks (312b, 322b) have a stripe shape, and FIG. 16 shows the case where the pressure blocks (312b, 322b) have a grid shape.

[0073] Referring to FIGS. 15 and 16, a secondary battery having electrode leads formed on both sides has a second region formed on both sides, so a first size pressure block is formed in the center, and on both sides, pressure blocks are formed with a second size smaller than the first size, and have a size that gradually decreases towards the ends of the secondary battery.

[0075] Next, the method for manufacturing a secondary battery according to the present invention will be described.

[0076] The method for manufacturing a secondary battery according to the present invention utilizes the aforementioned activation device in the step of activating the secondary battery.

[0077] FIG. 17 is a flowchart illustrating a method for manufacturing a secondary battery according to an embodiment of the present invention. Referring to FIG. 17, the method for manufacturing a secondary battery according to the present invention includes an activation step (S100), an aging step (S200), and a degass step (S300). In the activation step (S100), the battery cell is activated by simultaneously charging and pressurizing the battery cell using the aforementioned activation device.

[0078] The activation step (S100) involves housing an electrode assembly within a battery case, completing the injection of an electrolyte, and then charging the battery cell, which has the battery case sealed, to a predetermined SOC to form a Solid Electrolyte Interface (SEI) layer through an electrochemical reaction between the electrode active material and the electrolyte, thereby activating the battery cell so that it can be used. The battery cell may be a pouch-type battery cell in which an electrode assembly and an electrolyte are embedded in a battery case made of a laminate sheet comprising a resin layer and a metal layer.

[0079] When activating a secondary battery, in order to prevent gas generated during charging from being trapped inside the electrode assembly, the battery is pressurized simultaneously with charging, and accordingly, the internal gas moves to the outside of the electrode assembly.

[0080] In the present invention, for such pressurization, a pressurization step is performed using upper and lower pressurization plates and a plurality of first and second elastic pressurization members. Each of the first and second elastic pressurization members includes an elastic member and a pressurization block.

[0081] In this way, the first and second elastic pressurizing members, comprising an elastic member and a pressurizing block, can uniformly pressurize the secondary battery throughout, regardless of the flatness of the secondary battery, during the activation process of a pouch-type battery or a prismatic battery. An activation process proceeding with uniform pressurization enables the removal of generated activation gas without local trapping, thereby making it possible to manufacture a secondary battery with a uniform charge state.

[0082] As shown in FIGS. 4 to 6, the pressure blocks (112b, 122b) may be formed with the same size. Alternatively, as shown in FIGS. 7 to 11, the pressure blocks (212b, 222b) that press a first region (A1) with a constant electrode thickness may be formed with a first size, and the pressure blocks (212b, 222b) that press a second region (A2) with a thinner electrode thickness may be formed with a second size smaller than the first size. Alternatively, as shown in FIGS. 12 to 16, the pressure blocks (312b, 322b) that press a second region (A2) may be formed with a second size smaller than the first size, but may be formed to become progressively smaller toward the end of the secondary battery.

[0083] The aging stage is a process of maturing the secondary battery under various conditions to accelerate the stabilization of the SEI film formed through the activation stage.

[0084] The above aging step (S200) may undergo room temperature aging, in which the secondary battery is aged for a predetermined period under room temperature / atmospheric pressure conditions. Depending on the purpose, high temperature aging may be performed instead of room temperature aging, or both room temperature aging and high temperature aging may be performed. The above high temperature aging involves aging the battery in a high-temperature environment, which can accelerate the stabilization of the SEI film, and the high temperature aging and room temperature aging processes can be performed sequentially on the activated battery.

[0085] In one specific example, the high-temperature aging may be carried out at a temperature of 50°C to 100°C, preferably 50°C to 80°C. The high-temperature aging may be carried out for 1 to 30 hours, preferably 2 to 24 hours.

[0086] In one specific example, the room temperature aging may be carried out at a temperature of 18°C ​​to 28°C, more specifically 19°C to 27°C, more specifically 20°C to 26°C, and even more specifically 21°C to 25°C. The room temperature aging may be carried out for 12 to 120 hours, or 18 to 72 hours.

[0087] The above degassing step (S300) is a process of discharging oxygen gas generated during the activation and aging steps to the outside of the battery. The degassing step can be performed using methods generally used in the battery field without limitation.

[0088] In one specific example, the degassing step may include the step of cutting a part of the gas pocket portion to form an opening or a through hole; the step of discharging gas inside the secondary battery to the outside of the secondary battery through the opening or through hole; and the step of re-sealing the gas pocket portion.

[0089] The step of forming the opening or through hole described above is to form an opening or through hole in a part of the gas pocket portion through which gas can be exhausted in order to discharge gas inside the sealed secondary battery to the outside. To form the opening, a part of the pouch may be cut, and to form the through hole, a piercing means capable of forming a hole in the pouch may be used, and it is preferable that the location where the opening and through hole are formed is the upper part of the gas pocket portion.

[0090] The step of exhausting the internal gas to the outside involves exhausting the gas containing oxygen present inside the battery case to the outside through an opening or through hole formed in the gas pocket. At this time, the chamber containing the lithium secondary battery can be created into a vacuum state to exhaust and remove the internal gas of the lithium secondary battery. Additionally, a pressurization process of the lithium secondary battery may be performed during the exhaust process.

[0091] The step of re-sealing the gas pocket portion is a step of re-sealing the lithium secondary battery for an aging process or an additional charging process after a degassing process. In one specific example, the gas pocket portion can be sealed by cutting out the gas pocket portion area including the opening or through hole, removing the opening or through hole from the gas pocket portion, and sealing the cut surface.

[0093] Although an embodiment of the present invention has been described above, those skilled in the art may modify and change the present invention in various ways by adding, changing, deleting, or adding components, etc., without departing from the spirit of the present invention as described in the claims, and such modifications and changes are also to be included within the scope of the rights of the present invention. Explanation of the symbols

[0095] 100, 200, 300: Secondary battery activation device 110, 210, 310: Upper pressurizing part 120, 220, 320: Lower pressurizing section 111, 211, 311: Upper pressure plate 121, 221, 321: Lower pressure plate 112, 212, 312: First elastic pressure member 122, 222, 322: Second elastic pressure member 112a, 122a, 212a, 222a, 312a, 322a: Elastic members 112b, 122b, 212b, 222b, 312b, 322b: Pressurized block

Claims

Claim 1 An upper pressure member comprising an upper pressure plate and a plurality of first elastic pressure members formed on the lower surface of the upper pressure plate; and, a lower pressure member comprising a lower pressure plate formed opposite to the upper pressure plate and a plurality of second elastic pressure members formed on the upper surface of the lower pressure plate; wherein the first elastic pressure member comprises an elastic member and a pressure block, the upper end of the elastic member is fixedly formed on the lower surface of the upper pressure plate and the lower end of the elastic member is fixedly formed on the pressure block, and the second elastic pressure member comprises an elastic member and a pressure block, the lower end of the elastic member is fixedly formed on the upper surface of the lower pressure plate and the upper end of the elastic member is fixedly formed on the pressure block, and the pressure blocks are formed in a grid shape, and among the pressure blocks constituting the first and second elastic pressure members, the pressure blocks that press a first region where the electrode thickness of the secondary battery is constant are formed with a first size, and the pressure blocks that press a second region where the electrode thickness of the secondary battery becomes thin are formed with a second size smaller than the first size, and the pressure that presses the second region A secondary battery activation device, wherein the blocks are formed to be a second size smaller than the first size, and are formed to become progressively smaller toward the end of the secondary battery. Claim 2 delete Claim 3 A secondary battery activation device according to claim 1, wherein the elastic member is a spring. Claim 4 A secondary battery activation device according to claim 1, wherein the pressurizing block has an elastic surface formed on the surface that pressurizes the secondary battery. Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 A method for manufacturing a secondary battery using the secondary battery activation device of claim 1 in the activation step of the secondary battery.

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