Pressing apparatus and pressing method

Abstract

A pressing apparatus according to an embodiment of the present invention may comprise: a pressing roller which is provided to press a secondary battery cell including an electrode assembly and an exterior material surrounding the electrode assembly and is rolled on a portion of the exterior material overlapping the electrode assembly to press the electrode assembly; and a pressing plate extending in one direction along the edge of the electrode assembly to press a portion of the exterior material overlapping an edge portion of the electrode assembly.

Description

Pressurizing device and pressurizing method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2024-0023399, filed February 19, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a pressurizing device and a pressurizing method for pressurizing a secondary battery.

[0005] Secondary batteries (rechargeable batteries) are rechargeable and dischargeable, unlike primary batteries, which are non-rechargeable. Low-capacity secondary batteries are used in small, portable electronic devices such as cell phones, laptops, and camcorders, while large-capacity secondary batteries are widely used as power sources for motors in hybrid vehicles and as power storage batteries.

[0006] These secondary batteries include an electrode assembly composed of a positive electrode, a negative electrode, and a separator, and a case that accommodates the electrode assembly. Depending on their shape, they can be classified into circular, square, and pouch-shaped types. Among these, pouch-shaped secondary batteries can be formed with a laminate sheet, which is widely used as the exterior of lithium-ion secondary batteries because its exterior can be easily adjusted to various shapes and is light in weight.

[0007] In the process of forming a pouch-type secondary battery, an electrode assembly is placed in a pouch sheet and impregnated with an electrolyte. Conventionally, the electrolyte is typically injected into the sheet, followed by a vacuum-assisted impregnation process within a chamber, and then sealed. However, this can leave some air space within the electrode assembly, potentially reducing the electrolyte impregnation properties of that area. Therefore, a device capable of removing the remaining air within the electrode assembly and improving the electrolyte impregnation properties is needed.

[0008] The background technology described above is technology that the inventor possessed or acquired in the process of deriving the disclosure of the present application, and cannot necessarily be said to be publicly known technology disclosed to the general public prior to the present application.

[0009] The present invention has been devised to solve the above problems, and a task to be solved by the present invention is to provide a pressurizing device and a pressurizing method capable of pressurizing an electrode assembly to remove residual air and improve the impregnation property of an electrolyte.

[0010] A pressurizing device according to an embodiment of the present invention is provided to pressurize a secondary battery cell including an electrode assembly and an outer material surrounding the electrode assembly, and may include a pressurizing roller that rolls on a portion of the outer material overlapping the electrode assembly and presses the electrode assembly; and a pressurizing plate that extends in one direction along an edge of the electrode assembly to pressurize a portion of the outer material overlapping an edge portion of the electrode assembly.

[0011] The above pressure roller is coupled to the above pressure plate, and the above pressure plate can guide the movement of the above pressure roller.

[0012] The above pressure plates can be arranged in pairs spaced apart from each other in parallel.

[0013] The above-mentioned pressure roller may include a roller body that is provided to roll against the outer material and pressurize the electrode assembly; and a coupling portion that extends from the roller body so as to be supported by being coupled to a pressure plate.

[0014] A joining hole may be formed in the above pressure plate so that the joining portion of the above pressure roller is joined.

[0015] The above pressure plate may include a first plate extending along the length direction of the electrode assembly to press both width-wise ends of the electrode assembly.

[0016] The first plates may be arranged in pairs spaced apart from each other in a width direction of the electrode assembly, and the pressure roller may include a first roller extending in the width direction of the electrode assembly between the pair of first plates.

[0017] The above pressurizing plate may include a second plate extending along the width direction of the electrode assembly to pressurize both longitudinal ends of the electrode assembly.

[0018] The second plates may be arranged in pairs spaced apart from each other in a 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.

[0019] The length of the above pressure plate may be formed longer than the length of the edge of the electrode assembly on which the above pressure plate is placed.

[0020] The above pressure roller can be rolled in a direction toward an outer covering opening formed on one side of the outer covering.

[0021] The pressurizing plate includes a first plate extending along the longitudinal direction of the electrode assembly to pressurize both widthwise ends of the electrode assembly; and a second plate extending along the widthwise direction of the electrode assembly to pressurize both lengthwise ends of the electrode assembly; and the pressurizing roller includes a first roller extending in the widthwise 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, wherein the first roller and the second roller can be configured to sequentially pressurize the electrode assembly according to a preset order.

[0022] A pressurizing method according to an embodiment of the present invention may include a preparation step of preparing a secondary battery cell in which an outer casing opening is formed in an outer casing accommodating an electrode assembly; an injection step of injecting an electrolyte through the outer casing opening so that the electrode assembly is impregnated; a first plate pressurizing step of pressing a portion of the outer casing that overlaps either a longitudinal edge or a widthwise edge of the electrode assembly; and a first roller pressurizing step of pressing the electrode assembly while a first roller extending perpendicular to the first plate rolls on a portion of the outer casing that overlaps the electrode assembly.

[0023] The pressurizing method may further include a second plate pressurizing step in which a second plate presses a portion of the outer material that overlaps with the other of the longitudinal edge or the widthwise edge portion of the electrode assembly; and a second roller pressurizing step in which a second roller extending perpendicular to the second plate rolls on a portion of the outer material that overlaps with the electrode assembly and presses the electrode assembly.

[0024] The first plate pressing step and the first roller pressing step may be performed before and / or after the injection step.

[0025] The pressurizing device and pressurizing method according to the present invention can pressurize an electrode assembly to remove residual air and improve the impregnation property of an electrolyte.

[0026] In addition, the configurations according to the embodiments of the present invention may include effects that can be easily predicted by those skilled in the art.

[0027] Figure 1 is a schematic structural diagram showing a pressurizing device according to Example 1 of the present invention.

[0028] Fig. 2 is a drawing showing the combined form of the pressure roller and the pressure plate of the pressure device of Fig. 1.

[0029] Fig. 3 is a perspective view schematically showing the shape of the pressurizing plate of the pressurizing device of Fig. 1.

[0030] Figure 4 is a schematic structural diagram showing a pressurizing device according to Example 2 of the present invention.

[0031] Fig. 5 is a drawing showing the combined form of the pressure roller and the pressure plate of the pressure device of Fig. 4.

[0032] Figure 6 is a flowchart showing a pressurization method according to the present invention in which the injection step is performed before the pressurization step.

[0033] Figure 7 is a flowchart showing a pressurizing method according to the present invention in which the injection step is performed after the pressurizing step.

[0034] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. The following description is one of several aspects of the embodiments, and in describing one embodiment, detailed descriptions of well-known functions or configurations will be omitted to clarify the gist of the present invention.

[0035] In this specification, when adding reference signs to components in each drawing, the same or similar reference signs are attached to identical or similar components throughout the specification. Components included in one embodiment and components that have common functions will be described using the same names in other embodiments. Terms or words used in this specification and the claims should not be interpreted as limited to their usual or dictionary meanings, and should be interpreted as meanings and concepts that are consistent with the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of the term to best explain his or her invention.

[0036] Furthermore, the present invention is not limited to the embodiments described above, and those skilled in the art will readily appreciate that various modifications and variations can be made based on this disclosure. Therefore, the spirit of the present invention should not be construed as limited to the embodiments described above, and all variations equivalent to or equivalent to the claims, as well as the scope of the claims, are deemed to fall within the scope of the present invention.

[0037] Fig. 1 is a schematic structural diagram showing a pressurizing device according to Embodiment 1 of the present invention. Fig. 2 is a diagram showing a combination form of a pressurizing roller and a pressurizing plate of the pressurizing device of Fig. 1. Fig. 3 is a perspective view showing a schematic form of a pressurizing plate of the pressurizing device of Fig. 1. Fig. 4 is a schematic structural diagram showing a pressurizing device according to Embodiment 2 of the present invention. Fig. 5 is a diagram showing a combination form of a pressurizing roller and a pressurizing plate of the pressurizing device of Fig. 4.

[0038] A pressurizing device according to the present invention may be provided to pressurize a secondary battery cell including an outer covering (20) that surrounds an electrode assembly (10). The pressurizing device according to the present invention may include a pressurizing plate (31, 32) and a pressurizing roller (41, 42).

[0039] The pressure rollers (41, 42) may be provided to roll a portion of the outer material overlapping the electrode assembly (10) and pressurize the electrode assembly (10). The pressure rollers (41, 42) may roll along the outer material and move in one direction. The pressure plates (31, 32) may be provided to pressurize a portion of the outer material overlapping an edge area of ​​the electrode assembly (10). The pressure plates (31, 32) may have a shape extending along an edge portion of the electrode assembly (10). The pressure plates (31, 32) may be arranged along the edge of the electrode assembly (10).

[0040] Both the pressure rollers (41, 42) and the pressure plates (31, 32) can be configured to physically press the electrode assembly (10) in the thickness direction to remove air between the stacked electrodes and improve the impregnation property of the electrolyte. In other words, the pressure rollers (41, 42) and the pressure plates (31, 32) can press the electrode assembly (10) to accelerate the permeation of the electrolyte into the electrodes.

[0041] The pressurizing plates (31, 32) may have a shape extending in one direction along the edge of the electrode assembly (10) so as to pressurize a portion of the outer material (20) that overlaps with the edge of the electrode assembly (10). The electrode assembly (10) has an overall rectangular shape, and a short side portion where an electrode tab (11) is formed and a long side portion adjacent to the short side may be provided at the edge of the electrode assembly (10).

[0042] The short sides of the electrode assembly (10) may refer to both edges spaced apart in the length direction of the electrode assembly (10), that is, both ends in the length direction of the electrode assembly (10). The long sides of the electrode assembly (10) may refer to both edges spaced apart in the width direction of the electrode assembly (10), that is, both ends in the width direction of the electrode assembly (10). The long sides and short sides of the electrode assembly (10) only refer to both end edges in the width and length directions, and the length of each edge is not limited. For example, the length of the short sides of the electrode assembly may be formed to be longer than the length of the long sides.

[0043] The pressure plate (31, 32) may have a shape extending along the long side or the short side of the electrode assembly (10), and may be provided on the long side, the short side, or both of the electrode assembly (10). The pressure plate formed along the long side of the electrode assembly (10) may be referred to as the first plate (31), and the pressure plate formed along the short side of the electrode assembly (10) may be referred to as the second plate (32). The pressure plate may include the first plate (31) and / or the second plate (32).

[0044] The pressure rollers (41, 42) roll along a portion of the outer material (20) overlapping the electrode assembly (10) and pressurize the electrode assembly (10). The pressure rollers (41, 42) may be coupled with pressure plates (31, 32). The pressure rollers (41, 42) may have a shape extending between the pressure plates spaced apart from each other. The movement of the pressure rollers (41, 42) may be guided by the pressure plates (31, 32). The pressure roller (41) may include a first roller (41) coupled with a first plate (31) and / or a second roller (42) coupled with a second plate (32).

[0045] In the following examples, a pressurizing device according to different arrangement forms of the pressurizing plate and the pressurizing roller, and a more detailed structure and shape of the pressurizing plate (31, 32) and the pressurizing roller (41, 42) according to the same will be described.

[0046] Example 1

[0047] Referring to FIGS. 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).

[0048] The first plate (31) may be provided to press both width-wise ends of the electrode assembly (10). The first plate (31) may contact a portion of the outer material overlapping both width-wise ends of the electrode assembly (10) to press the electrode assembly (10) in the thickness direction.

[0049] The first plate (31) may extend along the longitudinal direction of the electrode assembly (10). The first plates (31) may be provided in multiple pieces. The first plates (31) may be provided as a pair, for example. In this case, the first plates (31) may be arranged in a pair so as to be spaced apart from each other in parallel in the width direction of the electrode assembly (10). The first plates (31) may be arranged at both ends of the electrode assembly (10) in the width direction. In other words, the first plates (31) may be formed along the aforementioned long sides of the electrode assembly (10).

[0050] The first plate (31) can press both width-wise ends of the electrode assembly (10). The first plate (31) can press both width-wise ends of the electrode assembly (10), i.e., the long sides, along the thickness direction of the electrode assembly (10). When the width-wise ends of the electrode assembly (10) are pressed, air remaining between the electrodes of the electrode assembly formed by stacking a plurality of electrodes can be removed by the pressure, and thus the electrode impregnation property of the electrolyte can be improved. In order to stably press the long sides of the electrode assembly (10), the length of the first plate (31) can be formed longer than the length of the electrode assembly (10).

[0051] A coupling hole (311) for coupling with a first roller (41) may be formed in the first plate (31) (see FIG. 3). The coupling hole (311) may be formed in a form that penetrates the first plate (31) and may have a slit shape extending along the longitudinal direction of the first plate (31). A coupling portion (412) of a first roller (41), which will be described later, may be coupled to the first plate (31).

[0052] The first roller (41) may be provided to roll and pressurize the electrode assembly (10). The first roller (41) may be moved by rolling on a portion of the outer material (20) that overlaps the electrode assembly (10). The first roller (41) may be moved by rolling along the longitudinal direction of the electrode assembly (10). The first roller (41) may pressurize a central portion of the electrode assembly (10) other than an edge portion of the electrode assembly (10) that is pressed by the first plate (31).

[0053] The first roller (41) can be coupled with 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 arranged between a pair of first plates (31) that are spaced apart from each other and are parallel to each other. The first roller (41) can have a shape that extends along the width direction of the electrode assembly (10) between the pair of first plates (31).

[0054] 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 a portion of the outer material (20) overlapping the electrode assembly (10). The roller body (411) may have a cylindrical appearance extending overall along the width direction of the electrode assembly (10). The length of the roller body (411) may be formed to correspond to the distance between the pair of first plates (31). The roller body (411) may be rolled along the length direction of the electrode assembly (10).

[0055] The coupling portion (412) may extend from the roller body (411). The coupling portion (412) may be provided to be coupled to the first plate (31) and supported by the first plate (31). The coupling portion (412) may be formed in a cylindrical shape, and the diameter of the coupling portion (412) may be smaller than the diameter of the roller body (411). The diameter of the coupling portion (412) may correspond to the width of the coupling hole (311) formed in the first plate (31), for example. 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 being in contact with the inner surface of the coupling hole (311) of the first plate (31). The coupling portion (412) may be slid along the coupling hole (311).

[0056] By adopting a configuration of a first plate (31) that presses the edge end of the electrode assembly (10) and a first roller (41) that presses the central portion of the electrode assembly (10) between the first plates (31), the entire surface of the electrode assembly (10) can be evenly pressed, and the electrolyte impregnation rate of the electrode can be greatly improved.

[0057] The first plate (31) and the first roller (41) can also be provided on the opposite side of the outer material (20) with the electrode assembly (10) between them.

[0058] Example 2

[0059] Embodiment 2 of the present invention may differ from Embodiment 1 in that a second plate (32) and a second roller (42) are provided. Except for the differences, it should be noted that the contents of the pressurizing device according to Embodiment 1 of the present invention described above can be commonly applied to Embodiment 2 as well. Therefore, contents common to Embodiment 1 will be omitted as much as possible, and Embodiment 2 will be described focusing on the differences from Embodiment 1.

[0060] Referring to FIGS. 4 and 5, the pressurizing device according to Embodiment 2 of the present invention may include a second plate (32) and a second roller (42).

[0061] The second plate (32) may be provided to press both longitudinal ends of the electrode assembly (10). The second plates (32) may extend in the width direction of the electrode assembly (10) and may be provided as a pair to be arranged at both longitudinal ends of the electrode assembly (10). In other words, the second plate (32) may be formed along the short side of the electrode assembly (10). The length of the second plate (32) may be formed longer than the width of the electrode assembly (10). A coupling hole (321) for coupling with the second roller (42) may be formed through the second plate (32) in the form of a slit.

[0062] The second roller (42) may be provided to roll and pressurize the electrode assembly (10). The second roller (42) may be moved by rolling on a portion of the outer material (20) that overlaps the electrode assembly (10). The second roller (42) may be disposed between a pair of second plates (32) spaced apart in the longitudinal direction of the electrode assembly (10). The second roller (42) may be coupled to the second plate (32). The movement of the second roller (42) may be guided by the second plate (32).

[0063] The second roller (42) may include a roller body (421) that rolls on the surface of the outer material (20) and presses the electrode assembly (10), and a coupling portion (422) that extends from the roller body (421) and is provided to be coupled 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 longitudinal ends of the roller body (421). The coupling portion (422) may be inserted into and supported by a coupling hole (321) of the second plate (32), and may slide along the coupling hole (321).

[0064] The second roller (42) can be rolled in a direction toward the outer material opening (21) formed on one side of the outer material (20). The outer material (20) can have an outer material opening (21) formed on one side for discharging residual air and gas, etc. The second roller (42) rolls in a direction toward the outer material opening (21) and pressurizes the electrode assembly (10), thereby allowing residual air, etc. to be pressed and moved in a direction toward the outer material opening (21), and thus the process of discharging gas through the outer material opening (21) can be more easily performed.

[0065] Example 3

[0066] Embodiment 3 of the present invention may differ from the preceding embodiments in that a first plate (31), a second plate (32), a first roller (41), and a second roller (42) are all provided. Similarly, commonalities with the preceding embodiments will be omitted as much as possible, and Embodiment 3 will be described focusing on the differences.

[0067] The pressurizing device according to Example 3 of the present invention may include a first plate (31), a second plate (32), a first roller (41), and a second roller (42).

[0068] The first plate (31) may extend along the length direction of the electrode assembly (10) to pressurize both width-wise ends of the electrode assembly (10). The second plate (32) may extend along the width direction of the electrode assembly (10) to pressurize both length-wise ends of the electrode assembly. In other words, the first plate (31) and the second plate (23) may be provided to pressurize the long sides and short sides of the electrode assembly (10), respectively.

[0069] The first roller (41) can extend in the width direction of the electrode assembly (10) between a pair of first plates (31). The second roller (42) can extend in 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 coupled to the first plate (31) and the second plate (32), respectively.

[0070] The first roller (41) and the second roller (42) may be configured to sequentially pressurize the electrode assembly (10) according to a preset order. That is, the pressurization by the first roller (41) and the second roller (42) may not be performed simultaneously but may be performed separately. For example, the pressurization process by the second roller (42) and the second plate (32) may be performed after the pressurization by the first roller (41) and the first plate (31) is performed. Conversely, the pressurization by the first roller (41) and the first plate (31) may be performed after the pressurization by the second roller (42) and the second plate (32).

[0071] By adopting this configuration, the phenomenon of the gas discharge path due to the pressurization of the roller being blocked by the pressurization plate can be prevented. For example, the phenomenon of the first plate (31) blocking the gas from flowing in the direction toward the outer material opening (21) by pressing the electrode assembly (10) while the second roller (42) rolls in the direction toward the outer material opening (21) can be prevented. In addition, by sequentially performing one pressurization process followed by another pressurization process, the removal of the air layer and the impregnation property of the electrolyte can be further improved through double pressurization.

[0072] Figures 6 and 7 are flowcharts illustrating a pressurization method according to the present invention. Figure 6 is a flowchart illustrating a pressurization method according to the present invention in which the injection step is performed before the pressurization step. Figure 7 is a flowchart illustrating a pressurization method according to the present invention in which the injection step is performed after the pressurization step.

[0073] Referring to FIGS. 6 and 7, the pressurizing method according to the present invention may include a preparation step (S1) of preparing a secondary battery cell in which an outer casing opening (21) is formed in an outer casing opening (20) containing an electrode assembly (10), an injection step (S2) of injecting an electrolyte through the outer casing opening (21) so that the electrode assembly (10) is impregnated, a first plate pressurizing step (S3) of pressing a portion of the outer casing (20) in which a first plate (31) overlaps with either a longitudinal edge or a widthwise edge of the electrode assembly (10), and a first roller pressurizing step (S4) of pressing the electrode assembly (10) by rolling a first roller (41) extending perpendicularly to the first plate (31) on a portion of the outer casing (20) in which the electrode assembly (10) overlaps.

[0074] The first plate pressurizing step (S3) and the first roller pressurizing step (S4) (hereinafter, the first pressurizing step), in which pressurization is performed by the first plate (31) and the first roller (41), respectively, may be performed before or after the injection step (S2) in which the electrolyte is injected.

[0075] The pressurizing method according to the present invention may further include a second plate pressurizing step (S5) in which the second plate (32) presses a portion of the outer material (20) that overlaps with the other of the longitudinal edge or the widthwise edge portion of the electrode assembly (10), and a second roller pressurizing step (S6) in which the second roller (42) extending perpendicularly to the second plate (32) rolls on the portion of the outer material (20) that overlaps with the electrode assembly (10) and presses the electrode assembly (10).

[0076] The second plate pressurizing step (S5) and the second roller pressurizing step (S6) (hereinafter, referred to as the second pressurizing step) in which pressurization is performed by the second plate (32) and the second roller (42), respectively, may be performed before or after the first pressurizing step (S3, S4) described above, and similarly, may be performed before or after the injection step (S2) in which the electrolyte is injected.

[0077] For example, after the first pressurization step (S3, S4) is performed, the second pressurization step (S5, S6) may be performed, and then the injection step (S2) for injecting the electrolyte may be performed (see Fig. 7). Alternatively, the first pressurization step (S3, S4) may be performed after the injection step (S2) for injecting the electrolyte, and then the second pressurization step (S5, S6) may be performed sequentially (see Fig. 6). Alternatively, various modifications may be possible, such as the injection step (S2) for injecting the electrolyte may be performed after the first pressurization step (S3, S4), and then the second pressurization step (S5, S6) may be performed. The first pressurization step and the second pressurization step may be performed repeatedly multiple times as needed.

[0078] In the above description, although the present invention has been described by limited embodiments and drawings, the above description is merely an example of the technical idea of ​​the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

[0079] Accordingly, the embodiments disclosed in the present invention are intended to illustrate, rather than limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical concepts within the scope equivalent thereto should be construed as being included within the scope of the present invention.

[0080]

Claims

1. A pressurizing device configured to pressurize a secondary battery cell including an electrode assembly and an outer material covering the electrode assembly, A pressure roller that rolls on the portion of the outer material that overlaps the electrode assembly and presses the electrode assembly; and A pressing device comprising a pressing plate extending in one direction along the edge of the electrode assembly so as to pressurize a portion of the outer material that overlaps with the edge portion of the electrode assembly.

2. In paragraph 1, The above pressure roller is coupled to the above pressure plate, The above pressure plate is a pressure device that guides the movement of the above pressure roller.

3. In paragraph 1, A pressurizing device in which the above pressurizing plates are arranged in pairs spaced apart from each other in parallel.

4. In paragraph 1, The above pressure roller, A roller body that is provided to roll against the outer material and pressurize the electrode assembly; and A pressurizing device comprising a coupling portion extending from the roller body so as to be supported by being coupled to a pressurizing plate.

5. In paragraph 4, A pressing device in which a joining hole is formed in the pressing plate so that the joining part of the pressing roller is joined.

6. In paragraph 1, A pressurizing device, wherein the pressurizing plate includes a first plate extending along the longitudinal direction of the electrode assembly to pressurize both widthwise ends of the electrode assembly.

7. In paragraph 6, The first plate is arranged in pairs spaced apart from each other in parallel in the width direction of the electrode assembly, A pressing device, wherein the pressing roller includes a first roller extending in the width direction of the electrode assembly between a pair of the first plates.

8. In paragraph 1, A pressurizing device, wherein the pressurizing plate includes a second plate extending along the width direction of the electrode assembly to pressurize both longitudinal ends of the electrode assembly.

9. In paragraph 8, The second plates are arranged in pairs spaced apart from each other in a longitudinal direction of the electrode assembly, A pressurizing device, wherein the pressurizing roller includes a second roller extending in the longitudinal direction of the electrode assembly between a pair of the second plates.

10. In paragraph 1, A pressurizing device in which the length of the pressurizing plate is formed longer than the length of the edge of the electrode assembly on which the pressurizing plate is placed.

11. In paragraph 1, A pressing device in which the above pressing roller rolls in a direction toward an opening of the outer covering formed on one side of the outer covering.

12. In paragraph 1, The above pressure plate, A first plate extending along the longitudinal direction of the electrode assembly to pressurize both width-wise ends of the electrode assembly; and A second plate extending along the width direction of the electrode assembly to pressurize both longitudinal ends of the electrode assembly, The above pressure roller, a first roller extending in the width direction of the electrode assembly between a pair of said first plates; and A second roller extending in the longitudinal direction of the electrode assembly between a pair of said second plates, A pressurizing device, wherein the first roller and the second roller are configured to sequentially pressurize the electrode assembly according to a preset order.

13. A preparatory step for preparing a secondary battery cell in which an opening in an outer material is formed in an outer material in which an electrode assembly is accommodated; An injection step of injecting an electrolyte through the opening of the outer material so that the electrode assembly is impregnated; A first plate pressing step in which the first plate presses a portion of the outer material that overlaps with either a longitudinal edge portion or a widthwise edge portion of the electrode assembly; A pressing method, comprising a first roller pressing step in which a first roller extending vertically from the first plate rolls on a portion of the outer material overlapping the electrode assembly and presses the electrode assembly.

14. In paragraph 13, A second plate pressing step in which the second plate presses a portion of the outer material that overlaps with the other of the longitudinal edge or the widthwise edge portion of the electrode assembly; and A pressing method further comprising a second roller pressing step in which a second roller extending vertically from the second plate rolls on a portion of the outer material overlapping the electrode assembly and presses the electrode assembly.

15. In paragraph 13, A pressurizing method, wherein the first plate pressurizing step and the first roller pressurizing step are performed before and / or after the injection step.

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