Sealing device

Abstract

A sealing device according to one embodiment of the present invention may comprise: a lead film that encompasses a lead metal of an electrode lead; a sealing block that seals a pouch encompassing the lead film and that has at least one sealing surface for pressing the lead film and the pouch, which overlap; and a sealing protrusion, which is provided at one portion of the sealing surface and protrudes a predetermined thickness from the sealing surface in the pressing direction of the sealing block so as to prevent the lead film from moving in the width direction of the sealing surface.

Description

sealing device

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0169683, filed November 29, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a sealing device for sealing a pouch for a secondary battery.

[0005] Secondary batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they have the primary advantage of dramatically reducing the use of fossil fuels, but also because they do not produce byproducts from energy use.

[0006] In the manufacturing process of pouch-type secondary batteries, the packaging material, the pouch, and the electrode lead are heat-sealed by a heating block or heating jig, which provides heat and pressure. The outer peripheral adhesive layer (Polypropylene, PP layer) of the pouch, which exists in the form of a thin film, is melted by the applied heat, increasing its freedom of flow. Then, it is hardened through an appropriate cooling process to achieve bonding.

[0007] The present invention provides a sealing device capable of suppressing or preventing a phenomenon in which a lead film covering a lead metal flows in the inside-outside direction of a pouch during sealing.

[0008] A sealing device according to one embodiment of the present invention may include a sealing block having at least one sealing surface configured to seal a lead film that wraps a lead metal of an electrode lead and a pouch that surrounds the lead film and to press the lead film and the pouch that overlap each other, and a sealing protrusion that protrudes from the sealing surface in a pressing direction of the sealing block by a predetermined thickness and is provided on a portion of the sealing surface to suppress or prevent the lead film from flowing in the width direction of the sealing surface.

[0009] The sealing surface may include a first sealing surface provided to seal a central portion of the lead film overlapping the lead metal, and a second sealing surface formed at a step from the first sealing surface on both sides of the first sealing surface to seal an edge portion of the lead film.

[0010] The above sealing protrusion may be provided on the second sealing surface.

[0011] The above sealing protrusion may have a shape extending along a length direction perpendicular to the width direction of the second sealing surface.

[0012] The above sealing protrusions may be provided in multiple numbers spaced apart in the width direction of the second sealing surface.

[0013] The above sealing protrusion can be formed at the widthwise end of the second sealing surface.

[0014] The above sealing protrusion may include a first sealing protrusion formed on the second sealing surface, and a second sealing protrusion provided spaced apart from the first sealing protrusion in the width direction of the second sealing surface.

[0015] The first sealing protrusion may be formed at one end of the second sealing surface, and the second sealing protrusion may be formed at the other end of the second sealing surface.

[0016] The above sealing surface may further include a third sealing surface that is positioned on the opposite side of the first sealing surface with respect to the second sealing surface and seals the pouches together, and the sealing protrusion may further include a third sealing protrusion that is provided on the third sealing surface and extends from the second sealing protrusion.

[0017] The above sealing blocks may be provided as a pair spaced apart from each other in the pressing direction.

[0018] A sealing device according to one embodiment of the present invention can suppress or prevent a phenomenon in which a lead film surrounding a lead metal flows in the inward-outward direction of a pouch during sealing. As a result, the durability and quality of a pouch-type secondary battery can be improved.

[0019] 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.

[0020] The following drawings attached to this specification illustrate embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0021] Fig. 1 is a perspective view of a sealing block of a sealing device according to a comparative example of the present invention.

[0022] Figure 2 is an enlarged view of the sealing portion shown in Figure 1.

[0023] Figure 3 is a drawing schematically showing a form in which a sealing device according to a comparative example of the present invention seals a lead film and a pouch.

[0024] Figure 4 is a cross-sectional view showing a cross-section taken along line II of Figure 3.

[0025] Figure 5 shows a phenomenon in which the lead film protrudes in the width direction of the sealing surface during the sealing process.

[0026] Figure 6 is a perspective view of a sealing block of a sealing device according to Example 1 of the present invention.

[0027] Fig. 7 is an enlarged view of the sealing portion shown in Fig. 6.

[0028] FIG. 8 is a drawing schematically showing a form in which a sealing device according to Example 1 of the present invention seals a lead film and a pouch.

[0029] Fig. 9 is a cross-sectional view showing a cross-section taken along line II-II of Fig. 8.

[0030] Fig. 10 is a cross-sectional view showing a cross-section taken along line III-III of Fig. 8.

[0031] Fig. 11 is an enlarged view of a portion of a sealing portion of a sealing device according to Example 2 of the present invention.

[0032] Fig. 12 is a drawing schematically showing a form in which a sealing device according to Example 2 of the present invention seals a lead film and a pouch.

[0033] In some of the accompanying drawings, corresponding components are designated by the same or similar drawing numbers or reference numerals. Those skilled in the art will appreciate that the drawings illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to facilitate understanding of various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated relative to other elements. Furthermore, elements of known technology that are useful or essential in commercially feasible embodiments may often not be depicted so as not to obscure the spirit of various embodiments of the present invention.

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

[0035] Components included in one embodiment and components with common functions will be described using the same names in other embodiments. Terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that inventors can appropriately define the concepts of terms to best describe their inventions, they should be interpreted in a way that conforms to the technical spirit of the present 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] In the manufacturing process of pouch-type secondary batteries, when the pouch, which is the packaging material, and the electrode lead are heat-sealed, the adhesive layer on the outer surface of the pouch, which exists in the form of a thin film, becomes fluid due to the applied heat and pressure, and its thickness becomes thinner compared to the state before normal bonding, and is pushed out in both lateral directions due to the inherent characteristics of the applied pressure and fluid state. Due to this pushing (leakage) phenomenon, a sharp part may be created by digging in a V shape in the heat-sealed adhesive layer itself, or an unequal wave shape may be formed in the heat-sealed adhesive layer, which may affect the durability and quality of the pouch-type secondary battery.

[0038] Considering this point, a sealing device according to one embodiment of the present invention provides a sealing device capable of suppressing or preventing a phenomenon in which a lead film wrapping a lead metal flows in the inside-outside direction of a pouch during sealing.

[0039]

[0040] Comparative example

[0041] Figures 1 to 5 illustrate a sealing device according to a comparative example of the present invention. Figure 1 is a perspective view of a sealing block (1) of a sealing device according to a comparative example of the present invention. Figure 2 is a partial perspective view of a sealing portion (10) of a sealing block (1) of a sealing device according to a comparative example of the present invention. Figure 3 is a plan view schematically showing a form in which a sealing device according to a comparative example of the present invention seals a lead film (6) and a pouch (7). Figure 4 is a cross-sectional view showing a cross-section taken along line II of Figure 3. Figure 5 illustrates a phenomenon in which a lead film (6) protrudes in the width direction (y) of a sealing surface during a sealing process.

[0042] Referring to FIGS. 1 to 3, the sealing block (1) of the sealing device according to the comparative example of the present invention may include a sealing portion (10).

[0043] The sealing portion (10) may be provided on a part of the sealing block (1), and may be provided to seal the lead film (6) that wraps the lead metal (5) of the electrode lead of the secondary battery, and the pouch (7) that surrounds the lead film (6). The sealing portion (10) may pressurize and heat the lead film (6) and the pouch (7) that surrounds it, thereby thermally bonding the pouch (7) and the lead film (6). In the case of Fig. 1, only one side of the sealing block (1) on which the sealing portion (10) is formed is shown, but the sealing blocks (1) on which the sealing portion (10) is formed may be provided as a pair on one side and the other side of the electrode lead and the pouch (7). For example, a pair of sealing blocks (1) may pressurize and heat the lead film (6) and the pouch (7) that surrounds it from above and below, thereby thermally bonding the pouch (7) and the lead film (6).

[0044] The sealing portion (10) may include a plurality of sealing surfaces (11, 12, 13) which are surfaces on which the pouch (7) and the lead film (6) are pressed. The sealing surfaces (11, 12, 13) may be provided to contact the pouch (7) surrounding the lead film (6) to pressurize the pouch (7) and transfer heat to the pouch (7). As illustrated in Fig. 2, the sealing surfaces (11, 12, 13) may include a first sealing surface (11), a second sealing surface (12), and a third sealing surface (13).

[0045] The first sealing surface (11) may be provided to seal the central portion of the lead film (6) that overlaps the lead metal (5) of the electrode lead. The first sealing surface (11) may seal the central portion of the lead film (6) and the pouch (7) by pressurizing and heating. The second sealing surface (12) may be provided to seal the left and right edge portions of the lead film (6). The second sealing surface (12) may be provided on both sides of the first sealing surface (11), and may be formed with a predetermined thickness stepped from the first sealing surface (11) in the pressing direction of the sealing block (1). According to one embodiment, the second sealing surface (12) may be formed to be higher by a predetermined height than the first sealing surface (11). The third sealing surface (13) may be provided on the outer side of the second sealing surface (12) to pressurize and heat the pouches (7) to seal adjacent pouches (7).

[0046] Referring to FIGS. 3 and 4, the lead film (6) surrounding the lead metal (5) and the pouch (7) surrounding the lead film (6) can be sealed by the sealing portion (10) of the sealing block (1). At this time, the edge portion of the lead film (6) that does not overlap with the lead metal (5) can be sealed by the second sealing surface (12) of the sealing portion (10). In the sealing device according to the comparative example of the present invention, the second sealing surface (12) can be provided in the form of a flat plate without a protrusion. When the lead film (6) is pressed from both directions by the second sealing surface (12) in the form of a flat plate, a leakage phenomenon of the lead film (6) may occur. For example, when a heated lead film (6) is pressed in an up-and-down direction by a sealing portion (10) provided on a pair of sealing blocks (1), the molten lead film (6) can be pushed out in the left-right and / or up-and-down directions of the pouch.

[0047] Referring to Fig. 5, it is possible to confirm the phenomenon of the lead film (6) leaking out during the process of the sealing part (10) sealing the pouch (7) and the lead film (6). The lead film (6), which is pressed from both directions by a pair of flat second sealing surfaces (12), may protrude in the width direction (y) of the second sealing surfaces (12) (as indicated by (a) in Fig. 5) due to the pressure applied from both directions. Similarly, Fig. 3 shows that the lead film (6) may protrude in the width direction (y) of the second sealing surface (12). In this way, when the lead film (6) protrudes in the width direction (y) of the second sealing surface (12), the surface of the pouch (7) surrounding the lead film (6) may be damaged or wrinkled, and further, problems such as a gap occurring between the pouch (7) and the lead film (6) may occur. Referring to the drawings below, a sealing device according to embodiments of the present invention for solving these problems will be described.

[0048]

[0049] Example 1

[0050] Figures 6 and 7 illustrate a sealing device according to Example 1 of the present invention.

[0051] FIG. 6 is a perspective view of a sealing block (2) of a sealing device according to Embodiment 1 of the present invention, and FIG. 7 is a partial perspective view showing a sealing portion (20) of a sealing block (2) of a sealing device according to Embodiment 1 of the present invention.

[0052] Referring to FIGS. 6 to 8, the sealing block (2) of the sealing device according to Embodiment 1 of the present invention may include a sealing portion (20). The sealing portion (20) may be provided on a portion of the sealing block (2) and may be provided to seal a lead film (6) that wraps a lead metal (5) of an electrode lead of a secondary battery and a pouch (7) that surrounds the lead film (6). The sealing portion (20) may pressurize and heat the lead film (6) and the pouch (7) that surrounds it to thermally fuse the pouch (7) and the lead film (6).

[0053] In the case of Fig. 6, only one side of the sealing block (2) having the sealing portion (20) formed is shown, but the sealing blocks (2) having the sealing portion (20) formed thereon may be provided as a pair spaced apart from each other in the pressing direction of the sealing blocks (2). For example, a pair of sealing blocks (2) may pressurize and heat the lead film (6) and the pouch (7) surrounding it from above and below to heat-fuse the pouch (7) and the lead film (6).

[0054] The sealing portion (20) may include a plurality of sealing surfaces (21, 22, 23) which are surfaces on which the pouch (7) and the lead film (6) are pressed. The sealing surfaces (21, 22, 23) may be provided to contact the pouch (7) surrounding the lead film (6) to pressurize the pouch (7) and transfer heat to the pouch (7). As illustrated in Fig. 7, the sealing surfaces (21, 22, 23) may include a first sealing surface (21), a second sealing surface (22), and a third sealing surface (23).

[0055] The first sealing surface (21) may be provided to seal the central portion of the lead film (6) that overlaps the lead metal (5) of the electrode lead. The first sealing surface (21) may seal the central portion of the lead film (6) and the pouch (7) by pressurizing and heating. The second sealing surface (22) may be provided to seal the left and right edge portions of the lead film (6). The second sealing surface (22) may be provided on both sides of the first sealing surface (21), and may be formed with a predetermined thickness stepped from the first sealing surface (21) in the pressing direction of the sealing block (2). According to one embodiment, the second sealing surface (22) may be formed to be higher than the first sealing surface (21) by a predetermined height. In addition, an inclined portion (212) that is inclined due to the step may be formed at the connection portion between the second sealing surface (22) and the first sealing surface (21). The third sealing surface (23) is provided on the outside of the second sealing surface (22), and can seal adjacent pouches (7) by pressurizing and heating the pouches (7).

[0056] The sealing portion (20) of the sealing device according to Embodiment 1 of the present invention may include a sealing protrusion (25). The sealing protrusion (25) may be provided on a portion of the sealing surface (21, 22, 23) to suppress or prevent leakage of the lead film (6) during sealing. The sealing protrusion (25) may be formed to protrude from the sealing surface (21, 22, 23) in the pressing direction of the sealing block (2), for example, in a direction perpendicular to the sealing surface (21, 22, 23), with a predetermined thickness.

[0057] According to one embodiment, a sealing protrusion (25) may be provided on the second sealing surface (22). The sealing protrusion (25) may be formed to protrude from the second sealing surface (22) with a predetermined thickness, and may be formed on a portion of the second sealing surface (22) provided to seal the left and right edge portions of the lead film (6). The sealing protrusion (25) may have a shape extending in a length direction perpendicular to the width direction of the second sealing surface (22). In other words, the sealing protrusion (25) may be formed in the shape of a bar having a rectangular shape.

[0058] Referring to Fig. 7, the sealing protrusions (25) may be provided in multiple pieces. For example, the sealing protrusions (25) may be formed as a pair. In this case, the sealing protrusions (25) may include a first sealing protrusion (251) and a second sealing protrusion (252) that is provided spaced apart from the first sealing protrusion (251) in the width direction of the second sealing surface (22). The first sealing protrusion (251) and the second sealing protrusion (252) may be spaced apart from each other in parallel in the width direction of the second sealing surface (22).

[0059] The first sealing protrusion (251) and the second sealing protrusion (252) may be positioned at opposite ends in the width direction of the second sealing surface (22), respectively. The first sealing protrusion (251) may be positioned at the inner end of the sealing surface (21, 22, 23) where the electrode assembly (not shown) is positioned, and the second sealing protrusion (252) may be positioned at the outer end of the sealing surface (21, 22, 23) facing outward. The first sealing protrusion (251) and the second sealing protrusion (252) may be formed, for example, with the same width and length. The thickness of the first sealing protrusion (251) and the second sealing protrusion (252) protruding from the second sealing surface (22) may also be the same. The first sealing protrusion (251) and the second sealing protrusion (252) have a shape that extends in a longitudinal direction perpendicular to the width direction of the second sealing surface (22), but can extend to the inclined portion (212) connecting the first sealing surface (21) and the second sealing surface (22).

[0060] By adopting the configuration of the sealing protrusion (25), the phenomenon of the lead film (6) leaking out in the width direction (y) of the second sealing surface (22) when the lead film (6) and the pouch (7) are sealed by the sealing portion (20) can be suppressed or prevented. The width direction (y) of the second sealing surface (22) can be the length direction of the lead metal (5), i.e., the inside-outside direction of the pouch (7). The mechanism by which the sealing protrusion (25) suppresses or prevents the leaking of the lead film (6) will be described below with reference to FIGS. 8 to 10.

[0061] Fig. 8 is a plan view schematically showing a form in which a sealing device according to Example 1 of the present invention seals a lead film (6) and a pouch (7). Fig. 9 is a cross-sectional view showing a cross-section taken along line II-II of Fig. 8. Fig. 10 is a cross-sectional view showing a cross-section taken along line III-III of Fig. 8.

[0062] Referring to FIGS. 8 to 10, according to one embodiment, a sealing protrusion (25) may be provided on a second sealing surface (22) that seals an edge portion of a lead film (6) that does not overlap with a lead metal (5). A pair of sealing protrusions (25) may be provided on the second sealing surface (22) spaced apart from each other in the width direction of the second sealing surface (22). The first sealing protrusion (251) may be formed on an inner end of the second sealing surface (22), and the second sealing protrusion (252) may be formed on an outer end of the second sealing surface (22).

[0063] When the sealing portion (20) pressurizes the pouch (7), a greater pressure (p) can be formed on the lead film (6) at a position corresponding to the sealing protrusion (25) on the second sealing surface (22) than on a portion where the sealing protrusion (25) is not formed.

[0064] In other words, pressure (p) is generated by the sealing protrusion (25) at the portion of the lead film (6) corresponding to the inner and outer ends of the second sealing surface (22), and as a result, the phenomenon of the lead film (6) being detached from the corresponding position in the width direction (y) of the second sealing surface (22), i.e., in the direction toward the inner and outer ends of the second sealing surface (22) (inner and outer direction of the pouch) can be suppressed or prevented.

[0065] In this case, the lead film (6) pressed by the second sealing surface (22) can move in a direction that fills the gap (s) generated between the pouch (7) and the lead film (6) instead of being separated in the inner-outer direction of the pouch (7) (see Fig. 10). A gap (s) may be generated between the pouch (7) and the lead film (6) due to the shape of the sealing portion (20), and the lead film (6) that is deformed by being pressurized and heat-sealed can flow in the longitudinal direction (b) perpendicular to the width direction of the second sealing portion (20) to fill the gap (s).

[0066]

[0067] Example 2

[0068] Figures 11 and 12 illustrate a sealing device according to Embodiment 2 of the present invention. Figure 11 is a partial perspective view showing a sealing portion (30) of the sealing device according to Embodiment 2 of the present invention, and Figure 12 is a plan view schematically showing a form in which the sealing device according to Embodiment 2 of the present invention seals a lead film (6) and a pouch (7).

[0069] The sealing device according to Embodiment 2 of the present invention may differ from Embodiment 1 in that it further includes a third sealing protrusion (353). Except for this difference, it should be noted that the contents of the secondary battery 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.

[0070] Referring to FIGS. 11 and 12, the sealing device according to the second embodiment of the present invention may further include a third sealing protrusion (353). According to one embodiment, the third sealing protrusion (353) may be provided on the third sealing surface (33) by extending from the second sealing protrusion (352) formed on the second sealing surface (32). Like the first sealing protrusion (351) and the second sealing protrusion (352), the third sealing protrusion (353) may be formed to protrude from the third sealing surface (33) with a predetermined thickness. The third sealing surface (33) may be provided on the outer side of the second sealing surface (32) that seals the edge of the lead film (6) and may be a surface that seals the pouches (7) together. On one side of the second sealing surface (32), a first sealing surface (31) may be formed to seal the central portion of the lead film (6) overlapping the lead metal (5) of the electrode lead, and on the other side, a third sealing surface (33) may be formed to seal adjacent pouches (7).

[0071] A first sealing protrusion (351) and a second sealing protrusion (352) may be formed on the inner and outer ends in the width direction of the second sealing surface (32), respectively, and the second sealing protrusion (351) and the second sealing protrusion (352) may be formed with the same length and width. As described above, the first sealing protrusion (351) and the second sealing protrusion (352) can prevent the lead film (6) from protruding in the width direction (y) of the second sealing surface (32) during sealing.

[0072] The third sealing protrusion (353) may be formed in a form extending from the second sealing protrusion (352). For example, the third sealing protrusion (353) and the second sealing protrusion (352) may be connected integrally. In this case, for example, the third sealing protrusion (353) may have the same width and thickness as the second sealing protrusion (352) and the first sealing protrusion (351).

[0073] The third sealing protrusion (353) is additionally formed on the third sealing surface (33) in a form connected to the second sealing protrusion (352), thereby additionally suppressing or preventing the lead film (6) from flowing out in the direction toward the outside of the pouch (7) (as indicated by (c) of FIG. 12).

[0074] 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.

[0075] 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.

[0076]

[0077] [Explanation of symbols]

[0078] 1,2: Sealing block

[0079] 10, 20, 30: Sealing part

[0080] 11, 21, 31: 1st sealing surface

[0081] 12, 22, 32: Second sealing surface

[0082] 13, 23, 33: Third sealing surface

[0083] 25, 35: Sealing protrusions

[0084] 251, 351: First sealing projection

[0085] 252, 352: Second sealing projection

[0086] 353: Third sealing projection

[0087] 5: Lead Metal

[0088] 6: Lead film

[0089] 7: Pouch

Claims

1. A sealing device provided to seal a lead film covering a lead metal of an electrode lead and a pouch surrounding the lead film, A sealing block having at least one sealing surface configured to pressurize the lead film and the pouch, which are overlapped with each other; and A sealing device comprising a sealing projection provided on a portion of the sealing surface and protruding from the sealing surface in the pressing direction of the sealing block with a predetermined thickness to prevent the lead film from flowing in the width direction of the sealing surface.

2. In paragraph 1, The above sealing surface is, A first sealing surface provided to seal a central portion of the lead film overlapping the lead metal; and A sealing device comprising a second sealing surface formed on both sides of the first sealing surface with a step difference from the first sealing surface to seal an edge portion of the lead film.

3. In paragraph 2, A sealing device in which the above sealing projection is provided on the second sealing surface.

4. In paragraph 2, A sealing device, wherein the sealing projection has a shape extending along a length direction perpendicular to the width direction of the second sealing surface.

5. In paragraph 4, A sealing device in which a plurality of the above sealing projections are provided spaced apart in the width direction of the second sealing surface.

6. In paragraph 2, A sealing device in which the above sealing projection is formed at the widthwise end of the second sealing surface.

7. In paragraph 2, The above sealing projection is, A first sealing projection formed on the second sealing surface; and A sealing device comprising a second sealing projection provided spaced apart from the first sealing projection in the width direction of the second sealing surface.

8. In paragraph 7, The above first sealing projection is formed at one end of the above second sealing surface, A sealing device, wherein the second sealing projection is formed at the other end of the second sealing surface.

9. In paragraph 8, The above sealing surface is, It further includes a third sealing surface located on the opposite side of the first sealing surface based on the second sealing surface and sealing the pouches together. The above sealing projection is, A sealing device further comprising a third sealing projection provided on the third sealing surface and extending from the second sealing projection.

10. In paragraph 1, A sealing device in which the above sealing blocks are provided as a pair and arranged spaced apart from each other in the pressing direction.

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