Secondary battery activation device and method for manufacturing secondary battery using the same

Abstract

To provide: a secondary battery activation device constituted in such a manner that gas generated inside a secondary battery cell during the activation process of the secondary battery can be effectively removed; and a method for manufacturing the secondary battery using the secondary battery activation device.SOLUTION: A secondary battery activation device 100 according to an embodiment of the present invention includes: an upper pressurization portion 110 including an upper pressurization plate 111 and a plurality of first elastic pressurization members 112 formed on the lower surface of the upper pressurization plate 111; and a lower pressurization portion 120 including a lower pressurization plate 121 formed opposite the upper pressurization plate 111 and a plurality of second elastic pressurization members 122 formed on the upper surface of the lower pressurization plate 121.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0162689, dated November 23, 2021.

[0002] The present invention relates to a secondary battery activation device that can effectively remove gas generated inside a secondary battery cell during an activation process of the secondary battery, and a method for manufacturing a secondary battery using the same. [Background technology]

[0003] 2. Description of the Related Art Due to technological development and increasing demand for mobile devices, the demand for batteries as an energy source is rapidly increasing, and as a result, much research is being conducted into batteries that can meet various demands.

[0004] In terms of battery shape, there is a high demand for prismatic secondary batteries and pouch-type secondary batteries that are thin and can be applied to products such as mobile phones, and in terms of materials, there is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries that have advantages such as high energy density, discharge voltage, and output stability.

[0005] Secondary batteries are also classified according to the structure of the electrode assembly, which consists of a positive electrode, a separator, and a negative electrode. Representative examples include a jelly roll (winding type) electrode assembly in which long sheet-shaped positive and negative electrodes are wound with a separator interposed between them, a stacked (layered) electrode assembly in which multiple positive and negative electrodes cut to a predetermined size are stacked in order with a separator interposed between them, and a stack-folding type electrode assembly in which a bi-cell or full cell in which a predetermined number of positive and negative electrodes are stacked with a separator interposed between them is wound.

[0006] In recent years, pouch-type batteries, which have a structure in which a stack-type or stack-folding type electrode assembly is housed in a pouch-type battery case made of an aluminum laminate sheet, have been attracting much attention due to their low manufacturing cost, small weight, and easy shape modification, and the use of such pouch-type batteries is gradually increasing.

[0007] Most secondary batteries, including pouch-type batteries, undergo a process of activating the battery by charging and discharging during the battery cell manufacturing process. In order to manufacture the final battery cell, the gas generated during the activation process must be removed, which is called a degassing process.

[0008] FIG. 1 is a cross-sectional view illustrating a secondary battery activation device according to the related art, and FIGS. 2 and 3 are illustrative images showing the results of a high-temperature pressurization activation process performed using the secondary battery activation device according to the related art.

[0009] Referring to Figure 1, a conventional secondary battery activation device is composed of a plate-shaped upper pressure plate 1 and a lower pressure plate 2. The plate-shaped upper pressure plate 1 and lower pressure plate 2 are heated with a secondary battery B placed between them, and pressurize both sides of the secondary battery B at high temperature while removing gas generated by charging at the electrode interface, thereby activating the secondary battery B.

[0010] However, when the electrode material is coated in a slurry state during the manufacture of the electrodes that make up secondary battery B, the fluidity of the slurry causes some flow at the end of the electrode before it dries, resulting in a thin electrode (the so-called electrode sliding region). This causes thickness differences at the end of the electrode, resulting in thickness imbalances in secondary battery B (see part C in Figure 1).

[0011] In this state, if the activation process is performed using the secondary battery activation device shown in Figure 1, the gas generated during the activation process will gather at the end of secondary battery B and be located at the interface of each electrode, as shown in Figure 2. However, since the pressure force of pressure plates 1 and 2 is not transmitted to the part where the thickness of secondary battery B becomes thinner (part C in Figure 1), the gas will be trapped as shown in Figure 3. This gas trapping phenomenon causes the problem of uneven charging. Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention aims to provide a secondary battery activation device that applies uniform pressure to a secondary battery cell even if the secondary battery cell has locally thin portions during the activation process, and that prevents gas generated during the activation process from being locally trapped within the cell, and a method for manufacturing a secondary battery using the same. [Means for solving the problem]

[0013] A secondary battery activation device according to an embodiment of the present invention includes an upper pressure unit including an upper pressure plate and a plurality of first elastic pressure members formed on a lower surface of the upper pressure plate, and a lower pressure unit including a lower pressure plate formed opposite the upper pressure plate and a plurality of second elastic pressure members formed on an upper surface of the lower pressure plate.

[0014] In the secondary battery activation device according to the embodiment of the present invention, the first elastic pressure member includes an elastic member and a pressure block, the upper end of the elastic member is fixed to the lower surface of the upper pressure plate and the lower end of the elastic member is fixed to the pressure block, and the second elastic pressure member includes an elastic member and a pressure block, the lower end of the elastic member is fixed to the upper surface of the lower pressure plate and the upper end of the elastic member is fixed to the pressure block.

[0015] In the secondary battery activation device according to the embodiment of the present invention, the elastic member may be a spring.

[0016] In the secondary battery activation device according to the embodiment of the present invention, the pressure block may have an elastic surface formed on a surface that presses the secondary battery.

[0017] In the secondary battery activation device according to the embodiment of the present invention, the pressure blocks constituting the first elastic pressure member and the second elastic pressure member may be formed to have the same size over the entire pressure region that presses the secondary battery.

[0018] In the secondary battery activation device according to an embodiment of the present invention, among the pressure blocks constituting the first elastic pressure member and the second elastic pressure member, the pressure block that presses the first region where the electrode thickness of the secondary battery is constant may be formed in a first size, and the pressure block that presses the second region where the electrode thickness of the secondary battery is thinner may be formed in a second size smaller than the first size.

[0019] In a secondary battery activation device according to an embodiment of the present invention, the pressure block that pressurizes the second region may be formed to a second size smaller than the first size and may be formed to gradually become smaller toward the end of the secondary battery.

[0020] In the secondary battery activation device according to the embodiment of the present invention, the pressure block may be formed in a striped pattern.

[0021] In the secondary battery activation device according to the embodiment of the present invention, the pressure block may be formed in a lattice shape.

[0022] The method for manufacturing a secondary battery according to the embodiment of the present invention is performed by using the above-described secondary battery activation device in the step of activating the secondary battery.

[0023] Further details of embodiments relating to various aspects of the present invention are included in the following detailed description. [Effects of the Invention]

[0024] According to an embodiment of the present invention, even if the thickness of a secondary battery cell is not uniform and there are locally thin portions during the activation process of the secondary battery, the entire surface of the secondary battery cell is uniformly pressurized, thereby preventing gas generated inside the secondary battery cell from being trapped inside the electrode assembly. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a cross-sectional view schematically illustrating a secondary battery activation device according to the related art; [Figure 2] 1 is an image illustrating a result of a high-temperature pressurization activation process performed in a secondary battery activation device according to the related art. [Figure 3] 1 is an image illustrating a result of a high-temperature pressurization activation process performed in a secondary battery activation device according to the related art. [Figure 4] 1 is a cross-sectional view schematically illustrating a secondary battery activation device according to a first embodiment of the present invention. [Figure 5] 1 is a view illustrating a pressing block formed in a stripe shape; [Figure 6] 1 is a view illustrating a pressurizing block formed in a lattice shape; [Figure 7] 4 is a cross-sectional view schematically illustrating a secondary battery activation device according to a second embodiment of the present invention. [Figure 8] 1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 9] 1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 10] 1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 11] 1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 12] 10 is a cross-sectional view schematically illustrating a secondary battery activation device according to a third embodiment of the present invention. [Figure 13] 1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 14]1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 15] 1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 16] 1 is a diagram illustrating pressure blocks formed in various shapes; [Figure 17] 2 is a flowchart illustrating a method for manufacturing a secondary battery using a secondary battery activation device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] Since the present invention can be modified in various ways and can have various embodiments, specific embodiments are exemplified and described in detail in the detailed description, but this is not intended to limit the present invention to the specific embodiments, and should be understood as including all modifications, equivalents, or alternatives within the spirit and technical scope of the present invention.

[0027] The terms used in the present invention are merely used to describe particular embodiments and are not intended to limit the present invention. The singular expressions include the plural expressions unless the context clearly indicates otherwise. In this application, terms such as "comprise" and "have" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and should be understood as not precluding the presence or possibility of addition of one or more other features, numbers, steps, operations, 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.

[0028] First, a secondary battery activation device according to a first embodiment of the present invention will be described with reference to Figures 4 to 6. Figure 4 is a cross-sectional view schematically illustrating the secondary battery activation device according to the first embodiment of the present invention, Figure 5 is a view illustrating a pressure block formed in a stripe pattern, and Figure 6 is a view illustrating a pressure block formed in a lattice pattern.

[0029] 4, the secondary battery activation device 100 according to the first embodiment of the present invention includes an upper pressurizing unit 110 and a lower pressurizing unit 120. The upper pressurizing unit 110 applies high-temperature pressure to the upper surface of the secondary battery B, and the lower pressurizing unit 120 applies high-temperature pressure to the lower surface of the secondary battery B.

[0030] The upper pressure unit 110 includes an upper pressure plate 111 and a plurality of first elastic pressure members 112 .

[0031] The upper pressure plate 111 is formed in a predetermined shape, for example, a rectangular plate, 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.

[0032] The elastic member 112a may be made of a material that can contract / expand due to an external force, such as a spring, synthetic rubber, etc. In the drawings, the elastic member 112a is shown as a spring. The upper end of the elastic member 112a is fixed to the lower surface of the upper pressure plate 111, and the lower end of the elastic member 112a is fixed to the pressure block 112b.

[0033] 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.

[0034] When the pressing block 112b is formed in a stripe pattern as shown in Fig. 5, it has the advantage of being relatively easy to manufacture, whereas when the pressing block 112b is formed in a grid pattern as shown in Fig. 6, it is relatively complicated to manufacture but has the advantage of being able to apply uniform pressure to secondary battery B even when there is a slight change in thickness.

[0035] The pressing block 112b is generally made of a sturdy material, but an elastic surface made of rubber or the like having 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 pressing block 112b.

[0036] 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 .

[0037] 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.

[0038] The elastic member 122a and the pressure block 122b are substantially the same as the elastic member 112a and the pressure block 112b described above, and therefore a repeated description will be omitted.

[0039] According to the secondary battery activation device of the first embodiment of the present invention configured as above, in the activation process of pouch-type batteries or square-type batteries, the secondary battery can be uniformly pressurized all over regardless of the flatness of the secondary battery.

[0040] In particular, even if the thickness of the secondary battery is locally thin, pressure can be applied uniformly to the spring elastic body, making it possible to carry out a more uniform activation reaction than before.

[0041] The activation process carried out under uniform pressure allows the generated activation gas to be removed without localized trapping, making it possible to manufacture secondary batteries with a uniform state of charge.

[0042] Next, a secondary battery activation device according to a second embodiment of the present invention will be described with reference to Figures 7 to 11. Figure 7 is a cross-sectional view showing a schematic view of the secondary battery activation device according to the second embodiment of the present invention, and Figures 8 to 11 are views showing pressure blocks formed in various shapes.

[0043] 7, a secondary battery activation device 200 according to the second embodiment of the present invention includes an upper pressure unit 210 and a lower pressure unit 220. In this embodiment, except for pressure blocks 212b and 222b, the remaining components (upper pressure plate 211, first elastic pressure member 212, elastic member 212a, lower pressure plate 221, second elastic pressure member 222, elastic member 222a) are substantially the same as those in the first embodiment described above, and therefore, a repeated description will be omitted.

[0044] In this embodiment, the pressure blocks 212b, 222b are formed to have different sizes depending on the region where pressure is applied to the secondary battery B. Specifically, the pressure blocks 212b, 222b that apply pressure to the first region (A1) of the secondary battery B where the electrode thickness is constant are formed to a first size, and the pressure blocks 212b, 222b that apply pressure to the second region (A2, sliding region) of the secondary battery B where the electrode thickness is thinner are formed to a second size that is smaller than the first size. The specific values ​​of the first and second sizes can be set depending on the size and characteristics of the secondary battery B.

[0045] The smaller the size of the pressure blocks 212b, 222b, the more uniformly they can apply pressure to even small thickness variations. Since there is relatively little change in electrode thickness in the first region, it is not necessary to reduce the size of the pressure blocks 212b, 222b. However, since there is a change in electrode thickness in the second region, it is preferable that the size of the pressure blocks 212b, 222b be formed to a second size smaller than the first size in the first region.

[0046] By varying the sizes of the pressure blocks 212b, 222b depending on the region to be pressurized, the number of pressure blocks 212b, 222b and the elastic members 212a, 222a that elastically support the pressure blocks required for the device design can be optimized, i.e., the number of pressure blocks 212b, 222b and elastic members 212a, 222a required for the first region can be reduced.

[0047] FIG. 8 illustrates that the pressure blocks 212b, 222b of this embodiment are formed in a stripe shape having a predetermined width and length, and FIG. 9 illustrates that they are formed in a grid shape having a predetermined area.

[0048] When the pressing blocks 212b and 222b are formed in a stripe pattern as shown in Fig. 8, it has the advantage of being relatively easy to manufacture, whereas when the pressing blocks 212b and 222b are formed in a grid pattern as shown in Fig. 9, it is relatively complicated to manufacture but has the advantage of being able to apply uniform pressure even to slight thickness variations across the entire area of ​​the secondary battery B.

[0049] 10 and 11 show the arrangement of the pressure blocks 212b, 222b of the secondary battery activation device when the electrode leads of the secondary battery B are formed on both sides. In Fig. 10, the pressure blocks 212b, 222b are in a striped pattern, while in Fig. 11, the pressure blocks 212b, 222b are in a lattice pattern.

[0050] Referring to Figures 10 and 11, a secondary battery having electrode leads formed on both sides has second regions formed on both sides, so that second-size pressure blocks are formed on both sides and a first-size pressure block is formed in the center.

[0051] Next, a secondary battery activation device according to a third embodiment of the present invention will be described with reference to Figures 12 to 16. Figure 12 is a cross-sectional view schematically illustrating the secondary battery activation device according to the third embodiment of the present invention, and Figures 13 to 16 are views illustrating pressure blocks formed in various shapes.

[0052] 12, a secondary battery activation device 300 according to the third embodiment of the present invention includes an upper pressure unit 310 and a lower pressure unit 320. In this embodiment, except for pressure blocks 312b and 322b, the remaining components (upper pressure plate 311, first elastic pressure member 312, elastic member 312a, lower pressure plate 321, second elastic pressure member 322, elastic member 322a) are substantially the same as those in the first embodiment described above, and therefore, a repeated description will be omitted.

[0053] In this embodiment, the pressure blocks 312b, 322b are formed to have different sizes depending on the region where pressure is applied to the secondary battery B. Specifically, the pressure blocks 312b, 322b that apply pressure to the first region (A1) where the electrode thickness of the secondary battery B is constant are formed to a first size, and the pressure blocks 312b, 322b that apply pressure to the second region (A2, sliding region) where the electrode thickness of the secondary battery B is thinner are formed to a second size that is smaller than the first size and gradually becomes smaller toward the end of the secondary battery.

[0054] The electrode thickness in the second region does not decrease at a constant rate, but may decrease more significantly toward the end of secondary battery B. Therefore, in this embodiment, the sizes of the pressure blocks 312b and 322b are gradually reduced toward the end of the secondary battery, so that even if the electrode thickness in the second region gradually changes, a uniform pressure can be applied to the second region as a whole.

[0055] FIG. 13 illustrates that the pressure blocks 312b, 322b of this embodiment are formed in a stripe shape having a predetermined width and length, and FIG. 14 illustrates that they are formed in a lattice shape having a predetermined area.

[0056] When the pressing blocks 312b and 322b are formed in a stripe pattern as shown in Fig. 13, it has the advantage of being relatively easy to manufacture, whereas when the pressing blocks 312b and 322b are formed in a grid pattern as shown in Fig. 14, it is relatively complicated to manufacture but has the advantage of being able to apply uniform pressure to the entire area of ​​the secondary battery B even when there are minute thickness variations.

[0057] 15 and 16 show the arrangement of pressure blocks 312b and 322b of a secondary battery activation device when electrode leads of secondary battery B are formed on both sides. In Fig. 15, the pressure blocks 312b and 322b are in a striped pattern, while in Fig. 16, the pressure blocks 312b and 322b are in a lattice pattern.

[0058] Referring to Figures 15 and 16, a secondary battery having electrode leads formed on both sides has second regions formed on both sides, so that a first size pressure block is formed in the center, and pressure blocks formed on both sides in a second size smaller than the first size and having sizes that gradually decrease toward the ends of the secondary battery are formed.

[0059] Next, a method for producing a secondary battery of the present invention will be described.

[0060] The method for manufacturing a secondary battery according to the present invention uses the above-described activation device in the step of activating the secondary battery.

[0061] 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 degassing step (S300). In the activation step (S100), the battery cell is activated by simultaneously charging and pressurizing the battery cell using the activation device described above.

[0062] In the activation step (S100), the electrode assembly is accommodated in the battery case, and after the electrolyte is injected and the battery case is temporarily sealed, the battery cell is charged 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 for use. The battery cell may be a pouch-type battery cell in which the electrode assembly and the electrolyte are contained in a battery case made of a laminate sheet including a resin layer and a metal layer.

[0063] When activating a secondary battery, in order to prevent gas generated during charging from being trapped inside the electrode assembly, the battery is pressurized while charging, thereby causing the internal gas to move outside the electrode assembly.

[0064] In the present invention, the pressing step is performed using upper and lower pressing plates and a plurality of first and second elastic pressing members, each of which includes an elastic member and a pressing block.

[0065] In this way, the first elastic pressure member and the second elastic pressure member, each including an elastic member and a pressure block, can uniformly pressurize the entire secondary battery regardless of the flatness of the secondary battery during the activation process of a pouch-type battery or a prismatic battery. The activation process performed under uniform pressure allows the generated activation gas to be removed without being locally trapped, thereby enabling the production of secondary batteries with a uniform state of charge.

[0066] As shown in Figures 4 to 6, the pressure blocks 112b and 122b may be formed to be the same size. Alternatively, as shown in Figures 7 to 11, the pressure blocks 212b and 222b that press the first region (A1) where the electrode thickness is constant may be formed to be a first size, and the pressure blocks 212b and 222b that press the second region (A2) where the electrode thickness is thinner may be formed to be a second size that is smaller than the first size. Alternatively, as shown in Figures 12 to 16, the pressure blocks 312b and 322b that press the second region (A2) may be formed to be a second size that is smaller than the first size and gradually become smaller toward the ends of the secondary battery.

[0067] The aging step is a process of aging the secondary battery under various conditions to accelerate the stabilization of the SEI film formed during the activation step.

[0068] The aging step (S200) may be room temperature aging, which ages the secondary battery for a predetermined time under room temperature / normal pressure conditions, or high temperature aging may be performed instead of room temperature aging depending on the purpose. Both room temperature aging and high temperature aging may be performed. The high temperature aging is performed by aging the battery in a high temperature environment, which can accelerate the stabilization of the SEI film. The high temperature aging and room temperature aging processes may be performed sequentially on an activated battery.

[0069] In one specific example, the high-temperature aging can be carried out at a temperature of 50° C. to 100° C., preferably 50° C. to 80° C. The high-temperature aging can be carried out for 1 to 30 hours, preferably 2 to 24 hours.

[0070] In one specific example, the room temperature aging can be carried out at a temperature of 18° C. to 28° C., specifically 19° C. to 27° C., further specifically 20° C. to 26° C., and even more specifically 21° C. to 25° C. The room temperature aging can be carried out for 12 to 120 hours, or 18 to 72 hours.

[0071] The 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 may be performed by any method commonly used in the battery field without limitation.

[0072] In one specific example, the degassing step may include the steps of cutting a portion of the gas pocket to form an opening or a through-hole, discharging gas inside the secondary battery to the outside of the secondary battery through the opening or the through-hole, and re-sealing the gas pocket.

[0073] The step of forming the opening or through-hole is a step of forming an opening or through-hole through which gas can be vented in a partial region of the gas pocket in order to discharge gas inside the sealed secondary battery to the outside. A piercing means may be used to cut a portion of the pouch to form the opening, and a piercing means may be used to form a hole in the pouch to form the through-hole. The opening and through-hole are preferably formed at an upper end of the gas pocket.

[0074] The step of discharging the internal gas to the outside is a step of discharging the oxygen-containing gas present inside the battery case to the outside through an opening or through-hole formed in the gas pocket. At this time, the chamber housing the lithium secondary battery may be evacuated to a vacuum state, and the internal gas of the lithium secondary battery may be discharged to the outside and removed. In addition, the lithium secondary battery may be pressurized during the discharging process.

[0075] The step of resealing the gas pocket is a step of resealing the lithium secondary battery for an aging process or an additional charging process after the degassing process. In one embodiment, the gas pocket can be sealed by cutting out the area of ​​the gas pocket including the opening or through-hole, removing the opening or through-hole from the gas pocket, and sealing the cut surface.

[0076] Although one embodiment of the present invention has been described above, a person having ordinary knowledge in the art may modify and change the present invention in various ways by adding, changing, deleting or adding components within the scope of the concept of the present invention as set forth in the claims, and such modifications and changes are also within the scope of the present invention. The following items are also disclosed: [Item 1] an upper pressure unit including an upper pressure plate and a plurality of first elastic pressure members formed on a lower surface of the upper pressure plate; a lower pressure unit including a lower pressure plate formed opposite to the upper pressure plate and a plurality of second elastic pressure members formed on an upper surface of the lower pressure plate; A secondary battery activation device comprising: [Item 2] the first elastic pressure member includes an elastic member and a pressure block, an upper end of the elastic member is fixed to a lower surface of the upper pressure plate, and a lower end of the elastic member is fixed to the pressure block; The second elastic pressure member includes an elastic member and a pressure block, a lower end of the elastic member is fixed to the upper surface of the lower pressure plate, and an upper end of the elastic member is fixed to the pressure block. [Item 3] Item 3. The secondary battery activation device according to item 2, wherein the elastic member is a spring. [Item 4] The pressure block is Item 3. The secondary battery activation device according to item 2, wherein an elastic surface is formed on the surface that presses the secondary battery. [Item 5] The pressure blocks constituting the first elastic pressure member and the second elastic pressure member each include: Item 3. The secondary battery activation device according to item 2, wherein the entire pressure region for pressurizing the secondary battery is formed to the same size. [Item 6] Among the pressure blocks constituting the first elastic pressure member and the second elastic pressure member, A secondary battery activation device as described in item 2, wherein a pressure block that applies pressure to a first region of the secondary battery where the electrode thickness is constant is formed in a first size, and a pressure block that applies pressure to a second region of the secondary battery where the electrode thickness is thinner is formed in a second size that is smaller than the first size. [Item 7] Item 6. A secondary battery activation device according to item 6, wherein the pressure block that applies pressure to the second region is formed to a second size that is smaller than the first size and gradually becomes smaller as it approaches the end of the secondary battery. [Item 8] Item 3. The secondary battery activation device according to item 2, wherein the pressure block is formed in a striped pattern. [Item 9] Item 3. The secondary battery activation device according to item 2, wherein the pressure block is formed in a lattice pattern. [Item 10] A method for manufacturing a secondary battery, wherein the secondary battery activation device according to any one of items 1 to 9 is used in the activation step of the secondary battery. [Explanation of symbols]

[0077] 100, 200, 300: Secondary battery activation device 110, 210, 310: Upper pressure section 120, 220, 320: Lower pressure 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 member 112b, 122b, 212b, 222b, 312b, 322b: Pressure block

Claims

1. an upper pressure unit including an upper pressure plate and a plurality of first elastic pressure members formed on a lower surface of the upper pressure plate; a lower pressure unit including a lower pressure plate formed opposite to the upper pressure plate and a plurality of second elastic pressure members formed on an upper surface of the lower pressure plate; Including, the first elastic pressure member includes an elastic member and a pressure block, an upper end of the elastic member is fixed to the lower surface of the upper pressure plate, and a lower end of the elastic member is fixed to the pressure block; the second elastic pressure member includes an elastic member and a pressure block, a lower end of the elastic member is fixed to the upper surface of the lower pressure plate, and an upper end of the elastic member is fixed to the pressure block; Among the pressure blocks constituting the first elastic pressure member and the second elastic pressure member, A secondary battery activation device, wherein a pressure block that applies pressure to a first region of the secondary battery where the electrode thickness is constant is formed to a first size, and a pressure block that applies pressure to a second region of the secondary battery where the electrode thickness is thinner is formed to a second size that is smaller than the first size.

2. 2. The secondary battery activation device according to claim 1, wherein the pressure block that presses the second region is formed to the second size smaller than the first size and is formed to gradually become smaller toward an end of the secondary battery.

3. 2. The secondary battery activation device according to claim 1, wherein the elastic member is a spring.

4. The pressure block is 2. The secondary battery activation device according to claim 1, wherein an elastic surface is formed on a surface that applies pressure to the secondary battery.

5. 2. The secondary battery activation device according to claim 1, wherein the pressure block is formed in a striped pattern.

6. The secondary battery activation device according to claim 1 , wherein the pressure block is formed in a lattice shape.

7. A method for manufacturing a secondary battery, which uses the secondary battery activation device according to any one of claims 1 to 6 in the activation step of the secondary battery.

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