Pressurizing device and pressurizing method

Abstract

A pressurizing device according to one embodiment of the present invention is provided to pressurize a secondary battery cell including an electrode assembly and an outer casing material enclosing the electrode assembly, and may include a pressurizing roller that pressurizes the electrode assembly while rolling over the portion where the outer casing material overlaps the electrode assembly, and a pressurizing plate that extends in one direction along the edge of the electrode assembly to pressurize the portion where the outer casing material overlaps with the edge of the electrode assembly.

Description

[[TECHNICAL FIELD]]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0023399 filed on February 19, 2024, and all contents disclosed in the document of the said Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a pressing device and a pressing method for pressing a secondary battery. [[BACKGROUND ART]]

[0003] Unlike non-rechargeable primary batteries, a rechargeable battery is a battery that can be charged and discharged. Low-capacity secondary batteries are used in portable small electronic devices such as mobile phones, notebook computers, and camcorders, while high-capacity secondary batteries are widely used as power sources for driving motors in hybrid electric vehicles, energy storage batteries, and the like.

[0004] Such a secondary battery includes an electrode assembly consisting of a positive electrode, a negative electrode, and a separator, and a case for accommodating the electrode assembly, and can be divided into cylindrical, prismatic, pouch-type, etc. according to its shape. Among these, the pouch-type secondary battery is easy to adjust its outer package into various shapes and has low weight, so the outer package can be formed of a laminate sheet which is widely used as an outer package for lithium ion secondary batteries.

[0005] In the process of forming a pouch-type secondary battery, the step of putting the electrode assembly into a pouch sheet and impregnating it with an electrolyte is performed. Conventionally, generally, after injecting the electrolyte into the sheet, an impregnation process using vacuum in a chamber is performed, and then the sheet is sealed. In this case, some air layers may remain inside the electrode assembly, which may cause the problem of reduced electrolyte impregnation performance at these regions. Therefore, there is a need for an apparatus that can remove the air remaining in the electrode assembly and improve the electrolyte impregnation performance.

[0006] The background technologies described above are those that the inventors possessed or acquired in the process of deriving the disclosures of this application, and cannot necessarily be considered publicly known technologies that were made public prior to this application. [Overview of the project] [Problems that the invention aims to solve]

[0007] One embodiment of the present invention was derived to solve the above-mentioned problems, and one problem that one embodiment of the present invention aims to solve is to provide a pressurizing device and pressurizing method that can pressurize an electrode assembly to remove the remaining air and improve the impregnation of the electrolyte. [Means for solving the problem]

[0008] A pressurizing device according to one embodiment of the present invention is configured to pressurize a secondary battery cell including an electrode assembly and an outer casing material enclosing the electrode assembly, and may include a pressurizing roller that pressurizes the electrode assembly while rolling over the portion of the outer casing material that overlaps with the electrode assembly, and a pressurizing plate that extends in one direction along the edge of the electrode assembly to pressurize the portion of the outer casing material that overlaps with the edge of the electrode assembly.

[0009] The pressure roller is coupled to the pressure plate, and the pressure plate can guide the movement of the pressure roller.

[0010] The pressure plates can be arranged in pairs, parallel to each other and spaced apart.

[0011] The pressure roller may include a roller body provided to pressurize the electrode assembly while rolling in contact with the exterior material, and a coupling portion extending from the roller body to be coupled to and supported by the pressure plate.

[0012] The pressure plate can be formed with coupling holes so that the coupling portion of the pressure roller can be coupled to it.

[0013] The pressure plate may include a first plate extending along the longitudinal direction of the electrode assembly so as to pressurize both ends of the electrode assembly in the short direction.

[0014] The first plates are arranged in pairs, spaced apart and parallel to the short direction of the electrode assembly, and the pressure roller may include a first roller extending in the short direction of the electrode assembly between the pair of first plates.

[0015] The pressure plate may include a second plate extending along the short direction of the electrode assembly to pressurize both longitudinal ends of the electrode assembly.

[0016] The second plates are arranged in pairs parallel to each other in the longitudinal direction of the electrode assembly, and the pressure roller may include a second roller extending in the longitudinal direction of the electrode assembly between the pair of second plates.

[0017] The length of the pressure plate can be made longer than the length of the edge of the electrode assembly on which the pressure plate is placed.

[0018] The pressure roller can be rolled in a direction toward the opening of the exterior material formed on one side of the exterior material.

[0019] The pressure plate includes a first plate extending along the longitudinal direction of the electrode assembly to pressurize both ends of the electrode assembly in the short direction, and a second plate extending along the short direction of the electrode assembly to pressurize both ends of the electrode assembly in the longitudinal direction, and the pressure roller includes a first roller extending in the short direction of the electrode assembly between a pair of the first plates, and a second roller extending in the longitudinal direction of the electrode assembly between a pair of the second plates, and the first roller and the second roller may be configured to pressurize the electrode assembly sequentially according to a predetermined order.

[0020] A pressing method according to an embodiment of the present invention includes: a preparation step of preparing a secondary battery cell in which an electrode assembly is accommodated in an exterior material formed with an exterior material opening; an injection step of injecting an electrolyte through the exterior material opening so that the electrode assembly is impregnated with the electrolyte; a pressing step of a first plate, wherein the first plate presses a portion where the exterior material overlaps any one of a longitudinal edge portion and a transverse edge portion of the electrode assembly; and a pressing step of a first roller, wherein the electrode assembly is pressed while rolling a first roller extending perpendicularly to the first plate at the portion where the exterior material overlaps the electrode assembly.

[0021] The pressing method may further include: a pressing step of a second plate, wherein the second plate presses a portion where the exterior material overlaps the other one of the longitudinal edge portion and the transverse edge portion of the electrode assembly; and a pressing step of a second roller, wherein the electrode assembly is pressed while rolling a second roller extending perpendicularly to the second plate at the portion where the exterior material overlaps the electrode assembly.

[0022] The pressing step of the first plate and the pressing step of the first roller may be performed before and / or after the injection step. Effects of the Invention

[0023] A pressing apparatus and a pressing method according to an embodiment of the present invention can remove residual air by pressing the electrode assembly, and improve the impregnation performance of the electrolyte.

[0024] In addition, effects that can be easily predicted by those skilled in the art from the configuration according to an embodiment of the present invention can be included. Brief Description of the Drawings

[0025] [Figure 1] Fig. 1 is a schematic structural diagram showing a pressing apparatus according to Embodiment 1 of the present invention. [Figure 2] Fig. 2 is a diagram showing a coupling form of a pressing roller and a pressing plate of the pressing apparatus in Fig. 1. [Figure 3] It is a perspective view schematically showing the form of the pressure plate of the pressure device in FIG. 1. [Figure 4] It is a schematic structural diagram showing a pressure device according to Embodiment 2 of the present invention. [Figure 5] It is a diagram showing the coupling form of the pressure roller and the pressure plate of the pressure device in FIG. 4. [Figure 6] It is a flowchart showing a pressing method according to an embodiment of the present invention, in which an injection step is performed before a pressing step. [Figure 7] It is a flowchart showing a pressing method according to an embodiment of the present invention, in which an injection step is performed after a pressing step. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that a person having ordinary knowledge in the technical field to which the present invention pertains can easily implement the present invention. The following description is one of various aspects of the embodiments, and when describing an embodiment, specific descriptions of well-known functions or configurations are omitted to clarify the gist of the present invention.

[0027] In the present specification, when reference signs are assigned to components in each drawing, the same or similar reference signs are assigned to the same or similar components throughout the specification. Components having common functions with components included in any one embodiment are described using the same names in other embodiments. Terms and words used in the present specification and the claims shall not be construed as being limited to ordinary or dictionary meanings. Based on the principle that inventors can appropriately define the concept of terms to describe their invention in the best way, terms and words should be interpreted with meanings and concepts consistent with the technical idea of the present invention.

[0028] Furthermore, the present invention is not limited to the embodiments described above, and various modifications and variations can be made from this description by anyone with ordinary skill in the art to which the present invention belongs. Therefore, the concept of the present invention should not be limited to the embodiments described above, and it can be said that not only the claims described later, but also everything that is equivalent to or has equivalent variations to the claims, falls within the scope of the concept of the present invention.

[0029] Figure 1 is a schematic structural diagram showing a pressurizing device according to Embodiment 1 of the present invention. Figure 2 is a diagram showing the coupling configuration of the pressurizing roller and pressurizing plate of the pressurizing device in Figure 1. Figure 3 is a perspective view showing a schematic configuration of the pressurizing plate of the pressurizing device in Figure 1. Figure 4 is a schematic structural diagram showing a pressurizing device according to Embodiment 2 of the present invention. Figure 5 is a diagram showing the coupling configuration of the pressurizing roller and pressurizing plate of the pressurizing device in Figure 4.

[0030] A pressurizing device according to one embodiment of the present invention can be configured to pressurize a secondary battery cell including an outer casing material 20 that encloses an electrode assembly 10. The pressurizing device according to one embodiment of the present invention may include pressurizing plates 31, 32 and pressurizing rollers 41, 42.

[0031] The pressure rollers 41 and 42 can be configured to roll over the portion of the outer material that overlaps with the electrode assembly 10, thereby applying pressure to the electrode assembly 10. The pressure rollers 41 and 42 can roll along the outer material and move in one direction. The pressure plates 31 and 32 can be configured to apply pressure to the portion of the outer material that overlaps with the edge region of the electrode assembly 10. The pressure plates 31 and 32 can have a form that extends along the edge of the electrode assembly 10. The pressure plates 31 and 32 can be positioned along the edge of the electrode assembly 10.

[0032] The pressure rollers 41, 42 and pressure plates 31, 32 can all be configured to physically pressurize the electrode assembly 10 in the thickness direction to remove air between the stacked electrodes and improve the impregnation of the electrolyte. In other words, the pressure rollers 41, 42 and pressure plates 31, 32 can pressurize the electrode assembly 10 and accelerate the absorption of the electrolyte into the electrodes.

[0033] The pressure plates 31 and 32 may have a shape that extends in one direction along the edge of the electrode assembly 10 so as to apply pressure to the portion of the exterior material 20 that overlaps with the edge of the electrode assembly 10. The electrode assembly 10 has an overall rectangular shape, and the edge of the electrode assembly 10 may be provided with a short side portion on which the electrode tab 11 is formed and a long side portion adjacent to the short side portion.

[0034] The short side of the electrode assembly 10 can refer to both ends separated in the longitudinal direction of the electrode assembly 10, i.e., both ends of the electrode assembly 10 in the longitudinal direction. The long side of the electrode assembly 10 can refer to both ends separated in the short direction of the electrode assembly 10, i.e., both ends of the electrode assembly 10 in the short direction. The long side and short side of the electrode assembly 10 only refer to the width and the ends in the longitudinal direction, and the length of each end is not limited.

[0035] The pressure plates 31 and 32 may have a configuration that extends along the long side or short side of the electrode assembly 10, and may be provided on the long side, short side, or both of the electrode assembly 10. A pressure plate formed along the long side of the electrode assembly 10 may be referred to as the first plate 31, and a pressure plate formed along the short side of the electrode assembly 10 may be referred to as the second plate 32. The pressure plates may include the first plate 31 and / or the second plate 32.

[0036] The pressure rollers 41 and 42 pressurize the electrode assembly 10 by rolling along the portion of the outer material 20 that overlaps with the electrode assembly 10, but the pressure rollers 41 and 42 can be coupled to pressure plates 31 and 32. The pressure rollers 41 and 42 may have a shape that extends between pressure plates spaced apart from each other. The movement of the pressure rollers 41 and 42 can be guided by the pressure plates 31 and 32. The pressure roller 41 may include a first roller 41 coupled to a first plate 31 and / or a second roller 42 coupled to a second plate 32.

[0037] In the following embodiments, a pressurizing device with different arrangements of pressurizing plates and pressurizing rollers, and the resulting more detailed structure and shape of the pressurizing plates 31, 32 and pressurizing rollers 41, 42 will be described.

[0038] Embodiment 1 Referring to Figures 1 to 3, the pressurizing device according to Embodiment 1 of the present invention may include a first plate 31 and a first roller 41.

[0039] The first plate 31 can be provided to pressurize both ends of the electrode assembly 10 in the short direction. The first plate 31 can pressurize the electrode assembly 10 in the thickness direction by contacting the portion of the outer material that overlaps both ends of the electrode assembly 10 in the short direction.

[0040] The first plate 31 can extend along the longitudinal direction of the electrode assembly 10. Multiple first plates 31 can be provided. For example, the first plates 31 can be provided in pairs. In this case, the pair of first plates 31 can be arranged spaced apart parallel to the short direction of the electrode assembly 10. The first plates 31 can be placed at both ends of the short direction of the electrode assembly 10. In other words, the first plates 31 can be formed along the aforementioned long sides of the electrode assembly 10.

[0041] The first plate 31 can pressurize both ends of the electrode assembly 10 in the short direction. The first plate 31 can pressurize both ends of the electrode assembly 10 in the short direction, i.e., the long sides, along the thickness direction of the electrode assembly 10. When both ends of the electrode assembly 10 in the short direction are pressed, the air remaining between the electrodes of the electrode assembly, which is formed by stacking multiple electrodes, can be removed by pressure, and therefore the electrode impregnation of the electrolyte can be improved. The length of the first plate 31 can be made longer than the length of the electrode assembly 10 so that the long sides of the electrode assembly 10 can be stably pressed.

[0042] A coupling hole 311 for coupling with the first roller 41 can be formed in the first plate 31 (see Figure 3). The coupling hole 311 can be provided in a form that penetrates the first plate 31, has a shape that extends along the longitudinal direction of the first plate 31, and can have a slit shape. The coupling portion 412 of the first roller 41, which will be described later, can be coupled to the first plate 31.

[0043] The first roller 41 can be configured to pressurize the electrode assembly 10 while rolling. The first roller 41 can move while rolling in the portion of the outer material 20 that overlaps with the electrode assembly 10. The first roller 41 can move while rolling along the longitudinal direction of the electrode assembly 10. The first roller 41 can pressurize the central portion of the electrode assembly 10, excluding the edges of the electrode assembly 10 that are pressed by the first plate 31.

[0044] The first roller 41 can be coupled to the first plate 31. The movement of the first roller 41 can be guided by the first plate 31. The first roller 41 can be positioned between a pair of first plates 31 that are spaced apart and parallel to each other. The first roller 41 can have a configuration that extends along the short direction of the electrode assembly 10 between the pair of first plates 31.

[0045] The first roller 41 may include a roller body 411 and a coupling portion 412. The roller body 411 may be configured to roll to apply pressure to the portion of the outer covering material 20 that overlaps with the electrode assembly 10. The roller body 411 may have a cylindrical appearance that extends along the short direction of the electrode assembly 10 overall. The length of the roller body 411 may be formed to correspond to the distance between a pair of first plates 31. The roller body 411 can roll along the longitudinal direction of the electrode assembly 10.

[0046] The coupling portion 412 may extend from the roller body 411. The coupling portion 412 may be configured to be coupled to and supported by the first plate 31. The coupling portion 412 is formed in a cylindrical shape, but its diameter may be smaller than the diameter of the roller body 411. The diameter of the coupling portion 412 may correspond, for example, to the width of the coupling hole 311 formed in the first plate 31. The coupling portion 412 may be inserted into and coupled to the coupling hole 311 of the first plate 31. The coupling portion 412 may be supported by abutting against the inner circumferential surface of the coupling hole 311 of the first plate 31. The coupling portion 412 may slide along the coupling hole 311.

[0047] By adopting a configuration in which a first plate 31 pressurizes the edges of the electrode assembly 10 and a first roller 41 pressurizes the central part of the electrode assembly 10 between the first plate 31, the entire surface area of ​​the electrode assembly 10 can be uniformly pressurized, and the electrolyte impregnation rate of the electrodes can be greatly improved.

[0048] The first plate 31 and the first roller 41 can also be provided on the opposite side of the outer casing material 20, with the electrode assembly 10 in between.

[0049] Embodiment 2 Embodiment 2 of the present invention may differ from Embodiment 1 in that it is equipped with a second plate 32 and a second roller 42. Aside from these differences, the details of the pressurizing device according to Embodiment 1 of the present invention described above can also be applied to Embodiment 2. Therefore, we will omit as much of the details common to Embodiment 1 as possible and describe Embodiment 2 focusing on the differences from Embodiment 1.

[0050] Referring to Figures 4 and 5, the pressurizing device according to Embodiment 2 of the present invention includes a second plate 32 and a second roller 42.

[0051] The second plate 32 can be provided to pressurize both longitudinal ends of the electrode assembly 10. The second plate 32 can extend in the short direction of the electrode assembly 10, be provided in pairs, and be positioned at both longitudinal ends of the electrode assembly 10. In other words, the second plate 32 can be formed along the short side of the electrode assembly 10. The length of the second plate 32 can be formed to be longer than the width of the electrode assembly 10. A coupling hole 321 for coupling with the second roller 42 can be formed through the second plate 32 in the form of a slit.

[0052] The second roller 42 can be configured to pressurize the electrode assembly 10 while rolling. The second roller 42 can move while rolling over the portion of the outer material 20 that overlaps with the electrode assembly 10. The second roller 42 can be positioned between a pair of second plates 32 spaced apart in the longitudinal direction of the electrode assembly 10. The second roller 42 can be coupled to the second plates 32. The movement of the second roller 42 can be guided by the second plates 32.

[0053] The second roller 42 may include a roller body 421 that pressurizes the electrode assembly 10 while rolling on the surface of the exterior material 20, and a coupling portion 422 that extends from the roller body 421 and is provided to connect with the second plate 32. The roller body 421 may have a cylindrical shape, and the coupling portion 422 may be provided in a form that protrudes from both ends in the longitudinal direction of the roller body 421. The coupling portion 422 may be inserted into and supported in a coupling hole 321 of the second plate 32 and may slide along the coupling hole 321.

[0054] The second roller 42 can be rolled toward an exterior material opening 21 formed on one side of the exterior material 20. An exterior material opening 21 can be formed on one side of the exterior material 20 for the discharge of remaining air and gases. By pressing the electrode assembly 10 while the second roller 42 rolls toward the exterior material opening 21, the remaining air and gases can be pressurized and moved toward the exterior material opening 21, thus making the gas discharge process through the exterior material opening 21 easier.

[0055] Embodiment 3 Embodiment 3 of the present invention may differ from the above-described embodiment in that it is equipped with a first plate 31, a second plate 32, a first roller 41, and a second roller 42. Similarly, we will omit as much as possible the content that is common with the above-described embodiment and describe Embodiment 3 focusing on the differences.

[0056] The pressurizing device according to Embodiment 3 of the present invention includes a first plate 31, a second plate 32, a first roller 41, and a second roller 42.

[0057] The first plate 31 can extend along the longitudinal direction of the electrode assembly 10 so as to pressurize both ends of the electrode assembly 10 in the longitudinal direction. The second plate 32 can extend along the longitudinal direction of the electrode assembly 10 so as to pressurize both ends of the electrode assembly 10 in the longitudinal direction. In other words, the first plate 31 and the second plate 32 can be provided so as to pressurize the long side and short side of the electrode assembly 10, respectively.

[0058] The first roller 41 can extend in the short direction of the electrode assembly 10 between a pair of first plates 31. The second roller 42 can extend in the longitudinal direction of the electrode assembly 10 between a pair of second plates 32. The first roller 41 and the second roller 42 can be coupled to the first plate 31 and the second plate 32, respectively.

[0059] The first roller 41 and the second roller 42 can be configured to pressurize the electrode assembly 10 sequentially according to a predetermined order. That is, the pressurization by the first roller 41 and the second roller 42 may not be performed simultaneously, but may be performed as separate processes. For example, the pressurization process by the first roller 41 and the first plate 31 may be performed first, followed by the pressurization process by the second roller 42 and the second plate 32. Conversely, the pressurization process by the second roller 42 and the second plate 32 may be performed first, followed by the pressurization by the first roller 41 and the first plate 31.

[0060] By adopting this configuration, it is possible to prevent the phenomenon in which the gas discharge path due to roller pressurization is blocked by the pressurizing plate. For example, by pressing the electrode assembly 10 while the second roller 42 rolls toward the exterior material opening 21, it is possible to prevent the first plate 31 from blocking the flow of gas toward the exterior material opening 21. Furthermore, by performing other pressurizing processes sequentially after one pressurizing process, the removal of the air layer and the impregnation of the electrolyte can be further improved by double pressurization.

[0061] Figures 6 and 7 are flowcharts showing a pressurization method according to one embodiment of the present invention. Figure 6 is a flowchart showing a pressurization method according to one embodiment of the present invention in which the injection step is performed before the pressurization step. Figure 7 is a flowchart showing a pressurization method according to one embodiment of the present invention in which the injection step is performed after the pressurization step.

[0062] Referring to Figures 6 and 7, a pressurization method according to one embodiment of the present invention may include: a preparation step (S1) of preparing a secondary battery cell in which an outer material 20 containing an electrode assembly 10 has an outer material opening 21 formed therein; an injection step (S2) of injecting an electrolyte through the outer material opening 21 so that the electrode assembly 10 is impregnated; a first plate pressurization step (S3) of pressurizing the portion of the first plate 31 that overlaps with either the longitudinal edge or the short edge of the electrode assembly 10 in the outer material 20; and a first roller pressurization step (S4) of pressurizing the electrode assembly 10 by rolling a first roller 41, which extends perpendicularly to the first plate 31, over the portion of the outer material 20 that overlaps with the electrode assembly 10.

[0063] The pressurization step of the first plate (S3) and the pressurization step of the first roller (S4) (hereinafter referred to as the first pressurization step), in which pressurization is performed by the first plate 31 and the first roller 41 respectively, can be performed before or after the injection step (S2) in which the electrolyte is injected.

[0064] A pressurizing method according to one embodiment of the present invention may further include a second plate pressurizing step (S5) in which the second plate 32 pressurizes the portion of the outer material 20 that overlaps with the longitudinal edge or the other of the short edge of the electrode assembly 10, and a second roller pressurizing step (S6) in which the second roller 42, which extends perpendicularly to the second plate 32, pressurizes the electrode assembly 10 while rolling it over the portion of the outer material 20 that overlaps with the electrode assembly 10.

[0065] The second pressurization step (S5) and the second pressurization step (S6) (hereinafter referred to as the second pressurization step), in which the second plate 32 and the second roller 42 are pressurized, respectively, can be performed before or after the first pressurization step (S3, S4) described above, and similarly, they can be performed before or after the injection step (S2) in which the electrolyte is injected.

[0066] For example, the first pressurization step (S3, S4) may be performed first, followed by the second pressurization step (S5, S6), and then the injection step (S2) in which the electrolyte is injected (see Figure 7). Alternatively, the first pressurization step (S3, S4) may be performed after the injection step (S2) in which the electrolyte is injected, followed by the second pressurization step (S5, S6) (see Figure 6). Or, various modifications are possible, such as performing the first pressurization step (S3, S4), then the injection step (S2) in which the electrolyte is injected, and then the second pressurization step (S5, S6). The first and second pressurization steps can be repeated multiple times as needed.

[0067] In the above description, the present invention has been illustrated with limited embodiments and drawings, but the above description is merely illustrative of the technical concept of the present invention, and various modifications and variations are possible without departing from the essential characteristics of the present invention for those who have ordinary skill in the art to which the present invention pertains.

[0068] Therefore, the embodiments disclosed in this invention are for illustrative purposes only, and not to limit the technical concept of the invention, and the scope of the technical concept of the invention is not limited by such embodiments. The scope of protection of this invention should be interpreted in accordance with the following claims, and all technical concepts within an equivalent scope should be interpreted as being included within the scope of the rights of this invention.

Claims

1. A pressurizing device configured to pressurize a secondary battery cell, which includes an electrode assembly and an outer casing material enclosing the electrode assembly, A pressure roller that applies pressure to the electrode assembly while rolling over the portion where the exterior material overlaps the electrode assembly, A pressurizing device comprising: a pressurizing plate extending in one direction along the edge of the electrode assembly so as to pressurize the portion of the exterior material that overlaps with the edge of the electrode assembly.

2. The pressure roller is connected to the pressure plate, The pressurizing device according to claim 1, wherein the pressurizing plate guides the movement of the pressurizing roller.

3. The pressurizing device according to claim 1, wherein a pair of pressurizing plates are arranged parallel to each other and spaced apart.

4. The aforementioned pressure roller A roller body is provided to press the electrode assembly while rolling and contacting the exterior material, The pressurizing device according to claim 1, further comprising: a coupling portion extending from the roller body so as to be coupled to and supported by the pressurizing plate.

5. The pressurizing device according to claim 4, wherein the pressurizing plate has coupling holes formed therein so that the coupling portion of the pressurizing roller can be coupled to it.

6. The pressurizing device according to claim 1, wherein the pressurizing plate includes a first plate extending along the longitudinal direction of the electrode assembly so as to pressurize both ends of the electrode assembly in the short direction.

7. The first plate is arranged in pairs, spaced apart and parallel to the short direction of the electrode assembly. The pressurizing device according to claim 6, wherein the pressurizing roller includes a first roller extending in the short direction of the electrode assembly between a pair of the first plates.

8. The pressurizing device according to claim 1, wherein the pressurizing plate includes a second plate extending along the short direction of the electrode assembly so as to pressurize both longitudinal ends of the electrode assembly.

9. The second plates are arranged in pairs parallel to each other and spaced apart in the longitudinal direction of the electrode assembly. The pressurizing device according to claim 8, wherein the pressurizing roller includes a second roller extending longitudinally in the electrode assembly between a pair of the second plates.

10. The pressurizing device according to claim 1, wherein the length of the pressurizing plate is formed to be longer than the length of the edge of the electrode assembly on which the pressurizing plate is arranged.

11. The pressurizing device according to claim 1, wherein the pressurizing roller rolls toward an opening in the exterior material formed on one side of the exterior material.

12. The aforementioned pressure plate is A first plate extending along the longitudinal direction of the electrode assembly so as to pressurize both ends of the electrode assembly in the short direction, It includes a second plate extending along the short direction of the electrode assembly so as to pressurize both longitudinal ends of the electrode assembly, The aforementioned pressure roller A first roller extending in the short direction of the electrode assembly between a pair of the first plates, The electrode assembly includes a second roller extending longitudinally between a pair of the aforementioned second plates, The pressurizing device according to claim 1, wherein the first roller and the second roller are configured to pressurize the electrode assembly in sequence according to a predetermined order.

13. A preparation step for preparing a secondary battery cell in which an electrode assembly is housed in an exterior material having an opening formed in the exterior material, An injection step in which an electrolyte is injected through the opening of the outer material so as to impregnate the electrode assembly, The first plate pressurizes the portion of the exterior material that overlaps with either the longitudinal edge or the short edge of the electrode assembly, A pressing method comprising: a first roller pressing step, in which a first roller extending perpendicularly to the first plate is rolled over the portion in which the exterior material overlaps the electrode assembly, thereby pressing the electrode assembly.

14. The second plate pressurizes the portion of the exterior material that overlaps with the longitudinal edge or the other of the short edge of the electrode assembly, The pressurizing method according to claim 13, further comprising a second roller pressurizing step of pressing the electrode assembly while rolling a second roller, which extends perpendicularly to the second plate, over the portion in which the exterior material overlaps the electrode assembly.

15. The pressurization method according to claim 13, wherein the pressurization step of the first plate and the pressurization step of the first roller are performed before and / or after the injection step.

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