Pressurizing device and pressurizing method

Abstract

A pressurizing device according to an embodiment of the present invention may comprise: a pressurizing roller provided to pressurize a secondary battery cell comprising an electrode assembly and an outer packaging material surrounding the electrode assembly, and rolling on a portion of the outer packaging material overlapping the electrode assembly to pressurize the electrode assembly; and a pressing plate extending in one direction along an edge of the electrode assembly to press a portion of the outer packaging material overlapping an edge portion of the electrode assembly.

Description

Technical Field

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2024-0023399, filed in Korea on February 19, 2024, the disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to a pressurizing device and a pressurizing method for pressurizing a secondary battery. Background Technology

[0004] Unlike primary batteries, which are non-rechargeable, secondary batteries (rechargeable batteries) are batteries that can be charged and discharged, while primary batteries are not. Low-capacity secondary batteries are used in small portable electronic devices such as mobile phones, laptops, and cameras, while high-capacity secondary batteries are widely used as power sources for drive motors in devices such as hybrid vehicles, as well as for energy storage.

[0005] These secondary batteries include an electrode assembly consisting of a positive electrode, a negative electrode, and a separator, as well as a housing that contains the electrode assembly. They can be classified according to their shape as cylindrical, square, and pouch-type. Among these secondary batteries, pouch-type secondary batteries, which can be formed from laminates, are widely used as housings for lithium-ion secondary batteries because their casings are easy to shape and lightweight.

[0006] In the process of forming a pouch cell, an electrode assembly is placed into a pouch and impregnated with an electrolyte. Conventionally, the electrolyte is injected into the sheet, followed by vacuum impregnation within a chamber, and then sealed. In this process, some air remains inside the electrode assembly, which can degrade the electrolyte impregnation performance of the corresponding areas. Therefore, a device is needed to remove residual air from the electrode assembly and improve the electrolyte impregnation performance.

[0007] The aforementioned background technology is technology that the inventors acquired or obtained in the process of bringing this application to the public disclosure, and is not necessarily known technology that was disclosed to the public before this application was filed. Summary of the Invention

[0008] Technical issues

[0009] This disclosure aims to solve the problems existing in the related technology. Therefore, the purpose of this disclosure is to provide a pressurizing device and pressurizing method, which can remove residual air and improve the impregnation performance of electrolyte by pressurizing the electrode assembly.

[0010] Technical solution

[0011] According to an embodiment of the present disclosure, the pressurizing device is configured to pressurize a secondary battery cell comprising an electrode assembly and an outer packaging material surrounding the electrode assembly, and the pressurizing device comprises: a pressurizing roller that rolls on the portion of the outer packaging material overlapping the electrode assembly and pressurizes 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 packaging material overlapping the edge portion of the electrode assembly.

[0012] The pressure roller can be connected to the pressure plate, and the pressure plate can guide the movement of the pressure roller.

[0013] The pair of pressure plates can be configured to be spaced apart from each other in parallel.

[0014] The pressure roller may include: a roller body that rolls against the outer packaging material and is configured to apply pressure to the electrode assembly; and a connecting portion that extends from the roller body to be connected to and supported by the pressure plate.

[0015] A connecting hole can be formed in the pressure plate so that the connecting part of the pressure roller is connected.

[0016] The pressure plate may include a first plate extending along the length of the electrode assembly to apply pressure to both ends of the electrode assembly in the width direction.

[0017] A pair of first plates may be configured to be spaced parallel to each other in the width direction of the electrode assembly, and the pressure roller may include a first roller extending between the pair of first plates in the width direction of the electrode assembly.

[0018] The pressure plate may include a second plate extending along the width direction of the electrode assembly to apply pressure to both ends of the electrode assembly in the length direction.

[0019] A pair of second plates may be configured to be spaced parallel to each other in the length direction of the electrode assembly, and the pressure roller may include a second roller extending between the pair of second plates in the length direction of the electrode assembly.

[0020] The length of the pressure plate can be configured to be longer than the length of the edge of the electrode assembly on which the pressure plate is disposed.

[0021] The pressure roller can roll in the direction of the opening in the outer packaging material formed on one side of the outer packaging material.

[0022] The pressure plate may include: a first plate extending along the length of the electrode assembly to apply pressure to both ends of the electrode assembly in the width direction; and a second plate extending along the width direction of the electrode assembly to apply pressure to both ends of the electrode assembly in the length direction, and the pressure roller may include: a first roller extending along the width direction of the electrode assembly between a pair of first plates; and a second roller extending along the length direction of the electrode assembly between a pair of second plates, wherein the first roller and the second roller are configured to apply pressure to the electrode assembly sequentially according to a preset order.

[0023] The pressurization method according to embodiments of the present disclosure may include the following steps: a preparation step, wherein a secondary battery cell is prepared, wherein an opening is formed in an outer packaging material containing an electrode assembly in the secondary battery cell; an injection step, wherein an electrolyte is injected through the opening in the outer packaging material to immerse the electrode assembly in the electrolyte; a first plate pressurization step, wherein a first plate pressurizes a portion of the outer packaging material that overlaps with either the edge of the electrode assembly in the length direction or the edge of the electrode assembly in the width direction; and a first roller pressurization step, wherein a first roller extending perpendicularly to the first plate rolls on the portion of the outer packaging material that overlaps with the electrode assembly and pressurizes the electrode assembly.

[0024] The pressurization method may further include the following steps: a second plate pressurization step, in which the second plate presses the portion of the outer packaging material that overlaps with the electrode assembly in the length direction or the other of the electrode assembly's edge in the width direction; and a second roller pressurization step, in which a second roller extending perpendicularly to the second plate rolls on the portion of the outer packaging material that overlaps with the electrode assembly and presses the electrode assembly.

[0025] The first plate pressurization step and the first roller pressurization step may be performed before and / or after the injection step.

[0026] Beneficial effects

[0027] The pressurizing device and pressurizing method disclosed herein can remove residual air and improve the impregnation performance of the electrolyte by pressurizing the electrode assembly.

[0028] In addition, effects that can be readily predicted by those skilled in the art from configurations according to embodiments of this disclosure may be included. Attached Figure Description

[0029] Figure 1This is a schematic structural diagram showing a pressurization device according to Embodiment 1 of the present disclosure.

[0030] Figure 2 It is shown Figure 1 A view showing the connection between the pressure roller and the pressure plate of the pressure device.

[0031] Figure 3 It is shown schematically. Figure 1 A perspective view of the pressurizing device in the form of a pressure plate.

[0032] Figure 4 This is a schematic structural diagram showing the pressurization device according to Embodiment 2 of the present disclosure.

[0033] Figure 5 It is shown Figure 4 A view showing the connection between the pressure roller and the pressure plate of the pressure device.

[0034] Figure 6 This is a flowchart illustrating a pressurization method according to the present disclosure, in which the injection step is performed before the pressurization step.

[0035] Figure 7 The flowchart is a pressurization method according to this disclosure, in which the injection step is performed after the pressurization step. Detailed Implementation

[0036] In the following, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement the present disclosure. The following description is one of several aspects of the embodiments; in describing one embodiment, specific descriptions of known functions or configurations will be omitted to clarify the key points of the disclosure.

[0037] In this specification, when attaching reference numerals to elements in each figure, the same or similar reference numerals are attached to the same or similar elements throughout the specification. Components included in any embodiment and components that share a common function will be described using the same names in other embodiments. It should be understood that the terms or words used in this specification and the appended claims should not be construed as limited to their general and dictionary meanings, but rather are interpreted based on the principle of allowing the inventors to appropriately define terms to obtain the best interpretation, and based on the meanings and concepts corresponding to the technical aspects of this disclosure.

[0038] Furthermore, this disclosure is not limited to the embodiments described above, and those skilled in the art to which this disclosure pertains can make various modifications and variations based on these descriptions. Therefore, the spirit of this disclosure should not be limited to the above embodiments, and the following claims and all equivalents or variations thereof shall be considered to fall within the scope of this disclosure.

[0039] Figure 1 This is a schematic structural diagram showing a pressurization device according to Embodiment 1 of the present disclosure. Figure 2 It is shown Figure 1 A view showing the connection between the pressure roller and the pressure plate of the pressure device. Figure 3 It is shown schematically. Figure 1 A perspective view of the pressurizing device in the form of a pressure plate. Figure 4 This is a schematic structural diagram showing the pressurization device according to Embodiment 2 of the present disclosure. Figure 5 It is shown Figure 4 A view showing the connection between the pressure roller and the pressure plate of the pressure device.

[0040] A pressurizing device according to the present disclosure can be provided to pressurize a secondary battery cell including an outer packaging material 20 surrounding an electrode assembly 10. The pressurizing device of the present disclosure may include pressure plates 31, 32 and pressure rollers 41, 42.

[0041] Pressure rollers 41 and 42 can be configured to roll on a portion of the outer packaging material overlapping with the electrode assembly 10 and apply pressure to the electrode assembly 10. Pressure rollers 41 and 42 can roll along the outer packaging material and move in one direction. Pressure plates 31 and 32 can be provided to apply pressure to a portion of the outer packaging material overlapping with the edge region of the electrode assembly 10. Pressure plates 31 and 32 can have a form extending along the edge portion of the electrode assembly 10. Pressure plates 31 and 32 can be provided along the edge of the electrode assembly 10.

[0042] The pressure rollers 41 and 42 and the pressure plates 31 and 32 can be configured to physically pressurize the electrode assembly 10 in the thickness direction to remove air between the stacked electrodes and improve the impregnation performance of the electrolyte. In other words, the pressure rollers 41 and 42 and the pressure plates 31 and 32 can pressurize the electrode assembly 10 to accelerate the penetration of the electrolyte into the electrodes.

[0043] The pressure plates 31 and 32 may have a shape that extends in one direction along the edge of the electrode assembly 10 to pressurize the portion of the outer packaging material 20 that overlaps with the edge portion of the electrode assembly 10. The electrode assembly 10 has an overall rectangular shape and may have a short side forming the electrode connector 11 and a long side adjacent to the short side at the edge of the electrode assembly 10.

[0044] The short side of electrode assembly 10 can refer to the two edges spaced apart along the length direction of electrode assembly 10, i.e., the two ends along the length direction of electrode assembly 10. The long side of electrode assembly 10 can refer to the two edges spaced apart along the width direction of electrode assembly 10, i.e., the two ends along the width direction of electrode assembly 10. The long and short sides of electrode assembly 10 refer only to the two end edges in the width and length directions, and the length of each edge is not limited. For example, the length of the short side of the electrode assembly can be made longer than the length of the long side.

[0045] The pressure plates 31 and 32 may have a shape extending along the long side or the short side of the electrode assembly 10, and may be disposed on the long side, the short side, or both of the long and short sides of the electrode assembly 10. The pressure plate extending along the long side of the electrode assembly 10 may be referred to as the first plate 31, and the pressure plate extending 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.

[0046] Pressure rollers 41 and 42 roll along the portion of the outer packaging material 20 that overlaps with the electrode assembly 10 and apply pressure to the electrode assembly 10. The pressure rollers 41 and 42 may be connected to pressure plates 31 and 32. The pressure rollers 41 and 42 may have a shape extending between pressure plates spaced apart from each other. The movement of the pressure rollers 41 and 42 may be guided by the pressure plates 31 and 32. The pressure roller 41 may include a first roller 41 connected to a first plate 31 and / or a second roller 42 connected to a second plate 32.

[0047] In the following embodiments, a pressurizing device with different arrangements of pressure plates and pressure rollers, and the corresponding pressure plates 31, 32 and pressure rollers 41, 42 will be described in more detail.

[0048] Implementation Method 1

[0049] Reference Figures 1 to 3 The pressurizing device of Embodiment 1 of this disclosure may include a first plate 31 and a first roller 41.

[0050] A first plate 31 can be provided to apply pressure to both ends of the electrode assembly 10 in the width direction. The first plate 31 can abut against the portion of the outer packaging material that overlaps with both ends of the electrode assembly 10 in the width direction, thereby applying pressure to the electrode assembly 10 in the thickness direction.

[0051] The first plate 31 may extend along the length direction of the electrode assembly 10. Multiple first plates 31 may be provided. For example, a pair of first plates 31 may be provided. In this case, the pair of first plates 31 may be provided parallel to each other and spaced apart in the width direction of the electrode assembly 10. The first plates 31 may be provided at both ends of the electrode assembly 10 in the width direction. In other words, the first plate 31 may be formed along the long side of the electrode assembly 10.

[0052] The first plate 31 can apply pressure to both ends of the electrode assembly 10 in the width direction. The first plate 31 can also apply pressure to both ends (i.e., the long sides) of the electrode assembly 10 in the width direction along the thickness direction. When pressure is applied to both ends of the electrode assembly 10 in the width direction, residual air between the electrodes of the electrode assembly formed by stacking multiple electrodes can be removed by the pressure, thereby improving the electrode impregnation performance of the electrolyte. The length of the first plate 31 can be made longer than the length of the electrode assembly 10 to stably apply pressure to the long sides of the electrode assembly 10.

[0053] A connection hole 311 for connection with the first roller 41 can be formed in the first plate 31 (see...). Figure 3 The connecting hole 311 may be provided in the form of penetrating the first plate 31, and may have a slit shape extending along the length direction of the first plate 31. The connecting portion 412 of the first roller 41, which will be described below, may be connected to the first plate 31.

[0054] The first roller 41 can be configured to roll and pressurize the electrode assembly 10. The first roller 41 can roll and move on the portion of the outer packaging material 20 that overlaps with the electrode assembly 10. The first roller 41 can roll and move along the length of the electrode assembly 10. The first roller 41 can pressurize the central portion of the electrode assembly 10 (excluding the edge portion of the electrode assembly 10 that is pressed by the first plate 31).

[0055] The first roller 41 may be connected to the first plate 31. The movement of the first roller 41 may be guided by the first plate 31. The first roller 41 may be disposed between a pair of first plates 31 that are parallel to each other. The first roller 41 may have a shape that extends along the width direction of the electrode assembly 10 between the pair of first plates 31.

[0056] The first roller 41 may include a roller body 411 and a connecting portion 412. The roller body 411 may be configured to roll to pressurize the portion of the outer packaging material 20 that overlaps with the electrode assembly 10. The roller body 411 has an overall cylindrical appearance extending along the width direction of the electrode assembly 10. The length of the roller body 411 may be formed corresponding to the distance between a pair of first plates 31. The roller body 411 may roll along the length direction of the electrode assembly 10.

[0057] A connecting portion 412 may extend from the roller body 411. The connecting portion 412 may be configured to connect with and be supported by the first plate 31. The connecting portion 412 is cylindrical, and its diameter may be smaller than the diameter of the roller body 411. The diameter of the connecting portion 412 may correspond to, for example, the width of a connecting hole 311 formed in the first plate 31. The connecting portion 412 may be inserted into and connected to the connecting hole 311 of the first plate 31. The connecting portion 412 may be supported by contacting the inner circumferential surface of the connecting hole 311 of the first plate 31. The connecting portion 412 may slide along the connecting hole 311.

[0058] By using the first plate 31 to press the edge end of the electrode assembly 10 and the first roller 41 to press the center part of the electrode assembly 10 between the first plates 31, the entire area of ​​the electrode assembly 10 can be uniformly pressurized, and the electrolyte impregnation rate of the electrode can be greatly improved.

[0059] The first plate 31 and the first roller 41 can be positioned on opposite sides of the outer packaging material 20 with the electrode assembly 10 placed between them.

[0060] Implementation Method 2

[0061] The difference between Embodiment 2 and Embodiment 1 lies in the provision of a second plate 32 and a second roller 42. Apart from this difference, it should be noted that the contents of the pressurizing device according to Embodiment 1 described above are also generally applicable to Embodiment 2. Therefore, the contents common to Embodiment 1 will be omitted as much as possible, and the differences between Embodiment 2 and Embodiment 1 will be the focus of the description.

[0062] Reference Figure 4 and Figure 5 The pressurizing device of Embodiment 2 of this disclosure may include a second plate 32 and a second roller 42.

[0063] A second plate 32 can be provided to apply pressure to both ends of the electrode assembly 10 in the length direction. The second plate 32 can extend in the width direction of the electrode assembly 10, and can be provided as a pair at both ends of the electrode assembly 10 in the length direction. 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. The connecting hole 321 for connecting to the second roller 42 can be formed through the second plate 32 in the form of a slit.

[0064] The second roller 42 can be configured to roll and pressurize the electrode assembly 10. The second roller 42 can roll and move on the portion of the outer packaging 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 along the length of the electrode assembly 10. The second roller 42 can be connected to the second plates 32. The movement of the second roller 42 can be guided by the second plates 32.

[0065] The second roller 42 may include a roller body 421 and a connecting portion 422. The roller body 421 rolls on the surface of the outer packaging material 20 and applies pressure to the electrode assembly 10. The connecting portion 422 extends from the roller body 421 and is configured to connect with the second plate 32. The roller body 421 may have a cylindrical shape, and the connecting portion 422 may be provided in a form that protrudes from both ends in the length direction of the roller body 421. The connecting portion 422 can be inserted into and supported by the connecting hole 321 of the second plate 32, and can slide along the connecting hole 321.

[0066] The second roller 42 can roll in the direction toward the outer packaging material opening 21 formed on one side of the outer packaging material 20. The outer packaging material opening 21 for discharging residual air, gas, etc., can be formed on one side of the outer packaging material 20. As the second roller 42 rolls toward the outer packaging material opening 21 and pressurizes the electrode assembly 10, residual air, etc., can be pressurized and moved in the direction toward the outer packaging material opening 21. Therefore, the process of discharging gas through the outer packaging material opening 21 can be performed more easily.

[0067] Implementation Method 3

[0068] The difference between Embodiment 3 of this disclosure and the aforementioned embodiments lies in the provision of a first plate 31, a second plate 32, a first roller 41, and a second roller 42. Similarly, content common to the aforementioned embodiments will be omitted as much as possible, and the differences between Embodiment 3 and the aforementioned embodiments will be the focus of the description.

[0069] The pressurizing device according to Embodiment 3 of this disclosure may include a first plate 31, a second plate 32, a first roller 41, and a second roller 42.

[0070] The first plate 31 can extend along the length direction of the electrode assembly 10 to apply pressure to both ends of the electrode assembly 10 in the width direction. The second plate 32 can extend along the width direction of the electrode assembly 10 to apply pressure to both ends of the electrode assembly 10 in the length direction. In other words, the first plate 31 and the second plate 23 can be provided to apply pressure to the long side and the short side of the electrode assembly 10, respectively.

[0071] A first roller 41 extends along the width direction of the electrode assembly 10 between a pair of first plates 31. A second roller 42 extends along the length direction of the electrode assembly 10 between a pair of second plates 32. The first roller 41 and the second roller 42 can be connected to the first plate 31 and the second plate 32, respectively.

[0072] The first roller 41 and the second roller 42 can be configured to pressurize the electrode assembly 10 sequentially according to a preset order. That is, the pressurization of the first roller 41 and the second roller 42 can be performed separately rather than simultaneously. For example, after pressurization by the first roller 41 and the first plate 31, the process of pressurization by the second roller 42 and the second plate 32 can be performed. Conversely, after pressurization by the second roller 42 and the second plate 32, the process of pressurization by the first roller 41 and the first plate 31 can be performed.

[0073] This configuration prevents the gas emission path from being obstructed by the pressure plate due to the pressurization of the rollers. For example, the second roller 42 rolls in the direction toward the opening 21 of the outer packaging material and pressurizes the electrode assembly 10, thereby preventing the first plate 31 from obstructing the flow of gas toward the opening 21 of the outer packaging material. Furthermore, since another pressurization process is performed sequentially after one pressurization process, the air layer removal effect and electrolyte impregnation performance can be further improved through double pressurization.

[0074] Figure 6 and Figure 7 This is a flowchart illustrating a pressurization method according to the present disclosure. Figure 6 This is a flowchart illustrating a pressurization method according to the present disclosure, in which the injection step is performed before the pressurization step. Figure 7 The flowchart is a pressurization method according to this disclosure, in which the injection step is performed after the pressurization step.

[0075] Reference Figure 6 and Figure 7 The pressurization method according to this disclosure may include the following steps: a preparation step S1, preparing a secondary battery cell, wherein an outer packaging material opening 21 is formed in the outer packaging material 20 accommodating the electrode assembly 10; an injection step S2, wherein an electrolyte is injected through the outer packaging material opening 21 to impregnate the electrode assembly 10; a first plate pressurization step S3, wherein a first plate 31 presses the portion of the outer packaging material 20 that overlaps with either the edge of the electrode assembly 10 in the length direction or the edge of the electrode assembly 10 in the width direction; and a first roller pressurization step S4, wherein a first roller 41 extending perpendicularly to the first plate 31 rolls on the portion of the outer packaging material 20 that overlaps with the electrode assembly 10 and presses the electrode assembly 10.

[0076] The first plate pressurization step S3 and the first roller pressurization step S4 (hereinafter referred to as the first pressurization step) are performed by the first plate 31 and the first roller 41 respectively, which can be performed before or after the electrolyte injection step S2.

[0077] The pressurization method according to this disclosure may further include: a second plate pressurization step S5, wherein the second plate 32 presses the portion of the outer packaging material 20 that overlaps with the electrode assembly 10 in either the length direction or the width direction; and a second roller pressurization step S6, wherein a second roller 42 extending perpendicularly to the second plate 32 rolls on the portion of the outer packaging material 20 that overlaps with the electrode assembly 10 and presses the electrode assembly 10.

[0078] The second pressurization step S5 and the second pressurization step S6 (hereinafter referred to as the second pressurization step) are performed by the second plate 32 and the second roller 42, respectively. They can be performed before or after the first pressurization steps S3 and S4, and similarly, they can be performed before or after the electrolyte injection step S2.

[0079] For example, the second pressurization steps S5 and S6 can be performed after the first pressurization steps S3 and S4, and then the electrolyte injection step S2 can be performed (see Figure 7 Alternatively, the first pressurization steps S3 and S4 can be performed after the electrolyte injection step S2, and then the second pressurization steps S5 and S6 can be performed sequentially (see...). Figure 6 Alternatively, various variations can be employed, such as performing the electrolyte injection step S2 after the first pressurization steps S3 and S4, followed by the second pressurization steps S5 and S6. The first and second pressurization steps can be repeated multiple times as needed.

[0080] The present disclosure has been described above with reference to a limited number of embodiments and accompanying drawings. However, the above description is merely an exemplary illustration of the technical concept of the present disclosure, and various modifications and variations can be made by those skilled in the art without departing from the essential characteristics of the present disclosure.

[0081] Therefore, the embodiments disclosed herein are not intended to limit the technical concept of this disclosure, but are used for illustrative purposes. The scope of the technical concept of this disclosure is not limited by these embodiments. The scope of protection of this disclosure should be interpreted in accordance with the following claims, and all technical concepts within the equivalent scope of the claims should be considered to be included within the scope of this disclosure.

Claims

1. A pressurizing device configured to pressurize a secondary battery cell comprising an electrode assembly and an outer packaging material surrounding the electrode assembly, the pressurizing device comprising: A pressure roller rolls over the portion of the outer packaging material that overlaps with the electrode assembly and applies pressure to the electrode assembly; as well as A pressure plate extending in one direction along the edge of the electrode assembly to pressurize the portion of the outer packaging material that overlaps with the edge portion of the electrode assembly.

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

3. The pressurizing device according to claim 1, in, The pair of pressure plates are arranged to be spaced apart from each other in parallel.

4. The pressurizing device according to claim 1, in, The pressure roller includes: A roller body that rolls against the outer packaging material and is configured to pressurize the electrode assembly; and A connecting part extends from the roller body to connect to and be supported by the pressure plate.

5. The pressurizing device according to claim 4, in, A connecting hole is formed in the pressure plate so that the connecting part of the pressure roller is connected.

6. The pressurizing device according to claim 1, in, The pressure plate includes a first plate that extends along the length of the electrode assembly to apply pressure to both ends of the electrode assembly in the width direction.

7. The pressurizing device according to claim 6, in, A pair of first plates are arranged to be spaced parallel to each other in the width direction of the electrode assembly, and The pressure roller includes a first roller that extends along the width direction of the electrode assembly between a pair of first plates.

8. The pressurizing device according to claim 1, in, The pressure plate includes a second plate that extends along the width direction of the electrode assembly to apply pressure to both ends of the electrode assembly in the length direction.

9. The pressurizing device according to claim 8, in, A pair of second plates are arranged to be spaced parallel to each other along the length direction of the electrode assembly, and The pressure roller includes a second roller that extends along the length direction of the electrode assembly between a pair of second plates.

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

11. The pressurizing device according to claim 1, in, The pressure roller rolls in a direction toward the opening in the outer packaging material formed on one side of the outer packaging material.

12. The pressurizing device according to claim 1, in, The pressure plate includes: A first plate, extending along the length of the electrode assembly, applies pressure to both ends of the electrode assembly in the width direction; and A second plate, extending along the width direction of the electrode assembly, applies pressure to both ends of the electrode assembly in the length direction, and The pressure roller includes: A first roller extends along the width direction of the electrode assembly between a pair of first plates; and The second roller extends along the length of the electrode assembly between a pair of second plates. The first roller and the second roller are configured to pressurize the electrode assembly in a preset order.

13. A pressurization method, the pressurization method comprising the following steps: Preparation steps, the preparation steps prepare secondary battery cells, in which an opening is formed in the outer packaging material containing the electrode assembly in the secondary battery cell; An injection step, wherein electrolyte is injected through an opening in the outer packaging material to immerse the electrode assembly; In the first plate pressurization step, the first plate pressurizes the portion of the outer packaging material that overlaps with one of the edges of the electrode assembly in the length direction or the edges of the electrode assembly in the width direction. as well as In the first roller pressing step, a first roller extending perpendicularly to the first plate rolls on the portion of the outer packaging material that overlaps with the electrode assembly and pressurizes the electrode assembly.

14. The pressurization method according to claim 13, further comprising the following steps: In the second plate pressurization step, the second plate pressurizes the portion of the outer packaging material that overlaps with the edge of the electrode assembly in the length direction or the edge of the electrode assembly in the width direction. as well as In the second roller pressing step, a second roller extending perpendicularly to the second plate rolls over the portion of the outer packaging material that overlaps with the electrode assembly and pressurizes the electrode assembly.

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

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