Sealing device

Abstract

A sealing device according to one embodiment of the present disclosure can include a lead film enclosing a lead metal of an electrode lead, a sealing block sealing a pouch wrapping the lead film, and having at least one sealing surface for pressing the overlapped lead film and pouch, and a sealing protrusion provided on a portion of the sealing surface and protruding from the sealing surface in a pressing direction of the sealing block by a predetermined thickness to prevent the lead film from moving in a width direction of the sealing surface.

Description

Technical Field

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2023-0169683, filed with the Korean Intellectual Property Office on November 29, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0004] This disclosure relates to a sealing device for sealing a pouch-shaped component for secondary batteries. Background Technology

[0005] Secondary batteries have attracted much attention as a new energy source for improving eco-friendly energy and energy efficiency because they not only have the major advantage of significantly reducing the use of fossil fuels, but also do not produce byproducts from energy use.

[0006] In the manufacturing process of pouch-type secondary batteries, the pouch-shaped component for packaging material and the electrode leads are heat-sealed using a heating block or heating clamp, which serves as the medium providing heat and pressure. A bonding layer (e.g., a polypropylene (PP) layer) existing in the form of a thin film on the outer peripheral surface of the pouch-shaped component is melted by the applied heat to increase the degree of freedom of flow, and then hardened through a suitable cooling process to achieve bonding. Summary of the Invention

[0007] Technical issues

[0008] This disclosure provides a sealing device capable of suppressing or preventing the lead film covering the lead metal from flowing in the inward-outward direction of the pouch during sealing.

[0009] Technical solution

[0010] The sealing device according to embodiments of the present disclosure can be configured to seal a lead film and a pouch-like element, the lead film covering the lead metal of the electrode leads, and the pouch-like element enclosing the lead film. The sealing device may include: a sealing block including at least one sealing surface configured to press against the overlapping lead film and pouch-like element; and a sealing protrusion disposed on a portion of the sealing surface to protrude from the sealing surface by a predetermined thickness in the pressing direction of the sealing block, thereby preventing the lead film from flowing along the width direction of the sealing surface.

[0011] The sealing surface may include: a first sealing surface configured to seal the central portion of the lead film overlapping with the lead metal; and a second sealing surface formed at both end portions of the first sealing surface in a stepped manner relative to the first sealing surface to seal the edge portions of the lead film.

[0012] The sealing protrusion can be provided on the second sealing surface.

[0013] The sealing protrusion may have a shape that extends along a length direction perpendicular to the width direction of the second sealing surface.

[0014] Multiple sealing protrusions spaced apart in the width direction of the second sealing surface can be provided.

[0015] The sealing protrusion may be formed on the end of the second sealing surface in the width direction.

[0016] The sealing protrusion may include: a first sealing protrusion formed on the second sealing surface; and a second sealing protrusion disposed spaced apart from the first sealing protrusion in the width direction of the second sealing surface.

[0017] The first sealing protrusion may be formed at one end portion of the second sealing surface, and the second sealing protrusion may be formed at the other end portion of the second sealing surface.

[0018] The sealing surface may further include a third sealing surface positioned opposite the first sealing surface based on the second sealing surface and sealing the bag-like member. The sealing protrusion may further include a third sealing protrusion disposed on the third sealing surface and extending from the second sealing protrusion.

[0019] The sealing blocks can be configured as a pair of sealing blocks spaced apart from each other in the pressing direction.

[0020] Beneficial effects

[0021] The sealing device according to embodiments of this disclosure can suppress or prevent the lead film covering the lead metal from flowing in the inward-outward direction along the pouch during sealing. Therefore, the durability and quality of the pouch-type secondary battery can be improved.

[0022] In addition, effects that can be readily predicted by those skilled in the art from the configurations of embodiments according to this disclosure may be included in this specification. Attached Figure Description

[0023] The accompanying drawings illustrate embodiments of the present disclosure and are intended to aid in further understanding the technical concept of the disclosure in conjunction with the detailed description of the disclosure to be described later. Therefore, this disclosure should not be construed as limited to the matters illustrated in the drawings.

[0024] Figure 1 This is a perspective view of the sealing block of a sealing device according to a comparative example of the present disclosure.

[0025] Figure 2 yes Figure 1 An enlarged view of the sealing portion shown in the figure.

[0026] Figure 3 The diagram illustrates a form of a sealing device according to a comparative example of the present disclosure, which seals the lead membrane and the bag-like element.

[0027] Figure 4 It is along Figure 3 The cross-sectional view taken from line II.

[0028] Figure 5 This illustrates the phenomenon where the lead wire membrane protrudes along the width of the sealing surface during the sealing process.

[0029] Figure 6 This is a perspective view of the sealing block of the sealing device according to Embodiment 1 of this disclosure.

[0030] Figure 7 yes Figure 6 An enlarged view of the sealing portion shown in the figure.

[0031] Figure 8 This is a schematic diagram illustrating the form of a sealing device according to Embodiment 1 of the present disclosure, which seals the lead membrane and the bag-shaped component.

[0032] Figure 9 It is along Figure 8 The cross-sectional view taken from line II-II.

[0033] Figure 10 It is along Figure 8 The cross-sectional view taken from line III-III.

[0034] Figure 11 This is an enlarged view of a portion of the sealing part of the sealing device according to Embodiment 2 of this disclosure.

[0035] Figure 12 This is a schematic diagram illustrating the form of a sealing device according to Embodiment 2 of the present disclosure, which seals the lead membrane and the bag-shaped component.

[0036] In some of the accompanying drawings, corresponding components are given the same or similar reference numerals. Those skilled in the art will understand that the drawings depict elements simply and clearly, and are not necessarily drawn to scale. For example, to facilitate understanding of the various embodiments, the dimensions of some elements illustrated in the drawings may be enlarged compared to other elements. Additionally, elements of known technology that are useful or necessary in commercially viable embodiments may often not be described so as not to interfere with the spirit of the various embodiments of this disclosure. Detailed Implementation

[0037] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement the disclosure. The following description is provided by way of example in various aspects of the embodiments, and in describing one embodiment, specific descriptions of known functions or configurations will be omitted in order to make the gist of the disclosure clear.

[0038] Components that have a common function with components included in one embodiment are described using the same name in another embodiment. The terms or words used in the specification and claims should not be construed as limited to their general and dictionary meanings, but should be interpreted, based on the principle that allows the inventor to appropriately define the terms in order to interpret his / her invention in the most appropriate way, as corresponding to the technical concept of this disclosure.

[0039] Furthermore, this disclosure is not limited to the embodiments described herein, and those skilled in the art to which this disclosure pertains can make various modifications and changes to the embodiments described herein based on this specification. Therefore, the concept of this disclosure should not be limited to the embodiments described herein, and the claims and all modifications equivalent to or related to the claims are intended to fall within the scope and spirit of this disclosure.

[0040] During the manufacturing process of pouch-type secondary batteries, when the pouch-shaped component used as packaging material is heat-sealed with the electrode leads, the bonding layer, which exists in the form of a thin film on the outer peripheral surface of the pouch-shaped component, becomes fluid due to the applied heat and pressure. Therefore, the thickness of the bonding layer is typically reduced compared to its state before bonding. This reduced-thickness bonding layer is pressed along both sides due to the applied pressure and the inherent characteristics of its fluid state. Due to this pushing (leakage) phenomenon, V-shaped grooves may form, resulting in sharp portions in the heat-sealed bonding layer itself, or grooves with unequal wave shapes may form within the heat-sealed bonding layer. This can affect the durability and quality of the pouch-type secondary battery.

[0041] In view of this fact, embodiments of the present disclosure may provide a sealing device capable of suppressing or preventing the lead film covering the lead metal from flowing in the inward-outward direction of the pouch during sealing.

[0042] Comparison Examples

[0043] Figures 1 to 5 The illustration shows a sealing device according to a comparative example of the present disclosure. Figure 1 This is a perspective view of the sealing block 1 of a sealing device according to a comparative example of the present disclosure. Figure 2 This is a partial perspective view of the sealing portion 10 of the sealing block 1 of the sealing device according to a comparative example of the present disclosure. Figure 3 The diagram illustrates a schematic plan view of a sealing device according to a comparative example of the present disclosure, which seals the lead membrane 6 and the bag-shaped member 7. Figure 4 It is along Figure 3 The cross-sectional view taken from line II. Figure 5 The diagram illustrates the phenomenon that the lead diaphragm 6 protrudes along the width direction y of the sealing surface during the sealing process.

[0044] Reference Figures 1 to 3 The sealing block 1 of the sealing device according to the comparative example of this disclosure may include a sealing portion 10.

[0045] A sealing portion 10 can be disposed within a part of the sealing block 1 to seal the lead film 6 and the pouch-like element 7. The lead film 6 covers the lead metal 5 of the electrode leads of the secondary battery, and the pouch-like element 7 encloses the lead film 6. The sealing portion 10 can press and apply heat to the lead film 6 and the pouch-like element 7 enclosing the lead film 6 to achieve a heat seal between the pouch-like element 7 and the lead film 6. Although in Figure 1 The diagram shows a sealing block 1 with a sealing portion 10, but a pair of sealing blocks 1 with the sealing portion 10 can be provided on one side and the other side of the electrode lead and the bag-shaped member 7. For example, the pair of sealing blocks 1 can press and apply heat to the lead film 6 and the bag-shaped member 7 that surrounds the lead film 6 upward and downward to heat seal the bag-shaped member 7 and the lead film 6.

[0046] The sealing portion 10 may include multiple sealing surfaces 11, 12, and 13 on which the pouch 7 and the lead diaphragm 6 are compressed. The sealing surfaces 11, 12, and 13 may contact the pouch 7 surrounding the lead diaphragm 6, pressing and transferring heat to the pouch 7. Figure 2 As illustrated, sealing surfaces 11, 12 and 13 may include a first sealing surface 11, a second sealing surface 12 and a third sealing surface 13.

[0047] The first sealing surface 11 can be configured to seal the central portion of the lead film 6 where it overlaps with the lead metal 5 of the electrode leads. The first sealing surface 11 can press and heat the central portion of the lead film 6 and the pouch-like member 7 to seal them. The second sealing surface 12 can be configured to seal the left and right edge portions of the lead film 6. The second sealing surface 12 is disposed at both ends of the first sealing surface 11 and can be stepped with a predetermined thickness relative to the first sealing surface 11 along the pressing direction of the sealing block 1. According to an embodiment, the second sealing surface 12 can be formed to be a predetermined height higher than the first sealing surface 11. The third sealing surface 13 can be disposed outside the second sealing surface 12 and press and heat the pouch-like member 7 to seal adjacent pouch-like members 7.

[0048] Reference Figure 3 and Figure 4 The lead film 6 covering the lead metal 5 and the bag-like member 7 enclosing the lead film 6 can be sealed by the sealing portion 10 of the sealing block 1. In this case, 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 of the comparative example according to this disclosure, the second sealing surface 12 can be configured as a flat plate without protrusions. When the second sealing surface 12 in the form of a flat plate presses the lead film 6 in both directions, leakage of the lead film 6 may occur. For example, when the lead film 6 heated by the sealing portion 10 provided on a pair of sealing blocks 1 is pressed upward and downward, the molten lead film 6 may be pushed to the left and right and / or upward and downward of the bag-like member and leak.

[0049] Reference Figure 5 It can be confirmed that during the sealing process of the bag-shaped piece 7 and the lead membrane 6 by the sealing part 10, leakage of the lead membrane 6 occurs. The lead membrane 6, which is pressed in two directions by the second sealing surface 12 in the form of a pair of flat plates, can protrude in the width direction y of the second sealing surface 12 by the pressure applied in these two directions (in Figure 5 (represented as "a" in Chinese). Figure 3 The diagram also illustrates that the lead film 6 can protrude along the width direction y of the second sealing surface 12. When the lead film 6 protrudes along the width direction y of the second sealing surface 12, the surface of the bag-like member 7 surrounding the lead film 6 may be grooved or wrinkled, and furthermore, defects may occur, such as gaps between the bag-like member 7 and the lead film 6. Referring to the following figures, a sealing device according to an embodiment of the present disclosure for addressing these limitations will be described.

[0050] Implementation Method 1

[0051] Figure 6 and Figure 7 The illustration shows a sealing device according to Embodiment 1 of the present disclosure.

[0052] Figure 6 This is a perspective view of the sealing block 2 of the sealing device according to Embodiment 1 of this disclosure, and Figure 7 This is a partial perspective view of the sealing portion 20 of the sealing block 2 of the sealing device according to Embodiment 1 of the present disclosure.

[0053] Reference Figures 6 to 8 According to Embodiment 1 of this disclosure, the sealing block 2 of the sealing device may include a sealing portion 20. The sealing portion 20 may be disposed within a portion of the sealing block 2 to seal the lead film 6 and the pouch-like member 7. The lead film 6 covers the lead metal 5 of the electrode leads of the secondary battery, and the pouch-like member 7 encloses the lead film 6. The sealing portion 20 may press and apply heat to the lead film 6 and the pouch-like member 7 enclosing the lead film 6 to achieve a heat seal between the pouch-like member 7 and the lead film 6.

[0054] Despite Figure 6 The diagram shows a sealing block 2 with a sealing portion 20, but a pair of sealing blocks 2 with sealing portions 20 can be arranged to be spaced apart from each other along the pressing direction of the sealing blocks 2. For example, a pair of sealing blocks 2 can press and heat the lead film 6 and the bag-shaped member 7 that surrounds the lead film 6 upward and downward to heat seal the bag-shaped member 7 and the lead film 6.

[0055] The sealing portion 20 may include multiple sealing surfaces 21, 22, and 23 on which the bag-like element 7 and the lead diaphragm 6 are compressed. The sealing surfaces 21, 22, and 23 may contact the bag-like element 7 enclosing the lead diaphragm 6, pressing the bag-like element 7 and transferring heat to it. Figure 7 As illustrated, sealing surfaces 21, 22 and 23 may include a first sealing surface 21, a second sealing surface 22 and a third sealing surface 23.

[0056] The first sealing surface 21 can be configured to seal the central portion of the lead film 6 where it overlaps with the lead metal 5 of the electrode lead. The first sealing surface 21 can press and heat the central portion of the lead film 6 and the bag-shaped member 7 to seal the central portion of the lead film 6 and the bag-shaped member 7. The second sealing surface 22 can be configured to seal the left and right edge portions of the lead film 6. The second sealing surface 22 is provided at both end portions of the first sealing surface 21 and can be stepped with a predetermined thickness relative to the first sealing surface 21 along the pressing direction of the sealing block 2. According to an embodiment, the second sealing surface 22 can be formed to be higher than the first sealing surface 21 by a predetermined height. In addition, at the connection portion between the second sealing surface 22 and the first sealing surface 21, an inclined portion 212 inclined due to the step between the second sealing surface 22 and the first sealing surface 21 can be formed. The third sealing surface 23 can be provided outside the second sealing surface 22 and press and heat the bag-shaped member 7 to seal the adjacent bag-shaped member 7.

[0057] According to Embodiment 1 of this disclosure, the sealing portion 20 of the sealing device may include a sealing protrusion 25. The sealing protrusion 25 may be provided on portions of the sealing surfaces 21, 22, and 23 to suppress or prevent leakage of the lead membrane 6 during sealing. The sealing protrusion 25 may be formed to protrude from the sealing surfaces 21, 22, and 23 with a predetermined thickness along the pressing direction of the sealing block 2, for example, in a direction perpendicular to the sealing surfaces 21, 22, and 23.

[0058] According to an 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 configured to seal the left and right edge portions of the lead film 6. The sealing protrusion 25 may have a shape extending along a length direction perpendicular to the width direction of the second sealing surface 22. For example, the sealing protrusion 25 may be formed in the shape of a rectangular rod.

[0059] Reference Figure 7 The sealing protrusion 25 can be configured as a plurality of sealing protrusions. For example, the sealing protrusion 25 can be formed as a pair of sealing protrusions. In this case, the sealing protrusion 25 may include a first sealing protrusion 251 and a second sealing protrusion 252 spaced apart from the first sealing protrusion 251 along 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 a parallel manner along the width direction of the second sealing surface 22.

[0060] The first sealing protrusion 251 and the second sealing protrusion 252 can be respectively positioned on two end portions in the width direction of the second sealing surface 22. The first sealing protrusion 251 can be positioned at the inner end portion of the sealing surfaces 21, 22, and 23, the electrode assembly (not shown) is positioned at the inner end portion of the sealing surfaces 21, 22, and 23, and the second sealing protrusion 252 can be positioned at the outward-facing outer end portion of the sealing surfaces 21, 22, and 23. The first sealing protrusion 251 and the second sealing protrusion 252 can be formed to have, for example, the same width and the same length. The thickness of the first sealing protrusion 251 protruding from the second sealing surface 22 and the thickness of the second sealing protrusion 252 can also be the same as each other. The first sealing protrusion 251 and the second sealing protrusion 252 can extend in a length 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.

[0061] By employing the configuration of the sealing protrusion 25, when the lead diaphragm 6 and the pouch 7 are sealed by the sealing portion 20, leakage of the lead diaphragm 6 along the width direction y of the second sealing surface 22 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, for example, the inner-outer direction of the pouch 7. (Refer to the following...) Figures 8 to 10 The mechanism by which the sealing protrusion 25 inhibits or prevents leakage of the lead membrane 6 is described.

[0062] Figure 8 This is a schematic plan view illustrating the form of a sealing device according to Embodiment 1 of the present disclosure, wherein the sealing device seals the lead membrane 6 and the bag-shaped member 7. Figure 9 It is illustrated along Figure 8 A cross-sectional view of the section cut by line II-II. Figure 10 It is illustrated along Figure 8 A cross-sectional view of the section cut by line III-III.

[0063] Reference Figures 8 to 10 According to an embodiment, a sealing protrusion 25 may be provided on a second sealing surface 22, which seals the edge portion of the lead film 6 that does not overlap with the lead metal 5. A pair of sealing protrusions 25 may be provided on the second sealing surface 22 and spaced apart from each other along the width direction of the second sealing surface 22. A first sealing protrusion 251 may be formed at the inner end of the second sealing surface 22, and a second sealing protrusion 252 may be formed at the outer end of the second sealing surface 22.

[0064] When the sealing portion 20 presses against the bag-shaped piece 7, a greater pressure p can be formed on the lead film 6 at the position corresponding to the sealing protrusion 25 on the second sealing surface 22 compared to the portion of the second sealing surface 22 where the sealing protrusion 25 is not formed.

[0065] For example, the sealing protrusion 25 generates pressure p on the portions of the lead film 6 corresponding to the inner and outer ends of the second sealing surface 22. Therefore, it is possible to suppress or prevent the lead film 6 from separating from the corresponding position along the width direction y of the second sealing surface 22, for example, along the direction toward the inner / outer end of the second sealing surface 22 (inside-outside direction of the pouch).

[0066] In this case, the lead film 6 pressed by the second sealing surface 22 can move in the direction of filling the gap s created between the bag-shaped member 7 and the lead film 6, rather than separating in the inward-outward direction of the bag-shaped member 7 (see, for example, see...). Figure 10 Due to the shape of the sealing portion 20, a gap s can be created between the bag-shaped member 7 and the lead membrane 6. The lead membrane 6, whose shape is deformed by heat sealing and pressing, can flow along the length direction b, which is perpendicular to the width direction of the second sealing portion 20, to fill the gap s.

[0067] Implementation Method 2

[0068] Figure 11 and Figure 12 The figure illustrates a sealing device according to Embodiment 2 of this disclosure. Figure 11 This is a partial perspective view of the sealing portion 30 of the sealing device according to Embodiment 2 of the present disclosure, and Figure 12 This is a schematic plan view illustrating the form of a sealing device according to Embodiment 2 of the present disclosure, wherein the sealing device seals the lead membrane 6 and the bag-shaped member 7.

[0069] The sealing device according to Embodiment 2 of this disclosure differs from the sealing device according to Embodiment 1 in that the sealing device according to Embodiment 2 further includes a third sealing protrusion 353. Apart from this difference, it should be noted that the above-described content regarding the secondary battery according to Embodiment 1 can also be applied to Embodiment 2. Therefore, where possible, content identical to that of Embodiment 1 will be omitted, and the description of Embodiment 2 will focus on the differences from Embodiment 1.

[0070] Reference Figure 11 and Figure 12According to Embodiment 2 of this disclosure, the sealing device may further include a third sealing protrusion 353. According to the embodiment, the third sealing protrusion 353 may extend from the second sealing protrusion 352 formed on the second sealing surface 32 and may be disposed on the third sealing surface 33. Similar to the first sealing protrusion 351 and the second sealing protrusion 352, the third sealing protrusion 353 may protrude from the third sealing surface 33 by a predetermined thickness. The third sealing surface 33 may be disposed outside the second sealing surface 32, which seals the edge portion of the lead film 6, and may seal the bag-shaped member 7. On one side of the second sealing surface 32, a first sealing surface 31 may be disposed to seal the central portion of the lead film 6 overlapping with the lead metal 5 of the electrode lead. On the other side of the second sealing surface 32, a third sealing surface 33 may be disposed to seal the adjacent bag-shaped member 7.

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

[0072] The third sealing protrusion 353 may be formed to extend from the second sealing protrusion 352. For example, the third sealing protrusion 353 and the second sealing protrusion 352 may be integrally connected. 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 to connect with the second sealing protrusion 352, so that leakage of the lead membrane 6 toward the outside of the bag-shaped member 7 can be additionally suppressed or prevented. Figure 12 (represented by "c" in Chinese).

[0074] In the foregoing description, although the present disclosure has been described by way of limited embodiments and accompanying drawings, the foregoing description is merely an example of the technical concept of the present disclosure, and those skilled in the art will understand that various modifications and changes can be made without departing from the basic features of the present disclosure.

[0075] Therefore, the embodiments disclosed herein are not intended to limit the technical concept of this disclosure, but rather to interpret it, and 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 by the appended claims, and all technical concepts within the scope of the appended claims should be interpreted as being included within the scope of the rights of this disclosure.

[0076] [List of reference numerals]

[0077] 1, 2: Sealing blocks

[0078] 10, 20, 30: Sealing parts

[0079] 11, 21, 31: First sealing surface

[0080] 12, 22, 32: Second sealing surface

[0081] 13, 23, 33: Third sealing surface

[0082] 25, 35: Sealing protrusions

[0083] 251, 351: First sealing protrusion

[0084] 252, 352: Second sealing protrusion

[0085] 353: Third sealing protrusion

[0086] 5: Lead metal

[0087] 6: Lead film

[0088] 7: Bag-shaped items

Claims

1. A sealing device, the sealing device being configured to seal a lead wire membrane and a bag-like element, the lead wire membrane covering the lead metal of an electrode lead, the bag-like element enclosing the lead wire membrane, the sealing device comprising: A sealing block, the sealing block including at least one sealing surface, the at least one sealing surface being configured to press against the overlapping lead film and the pouch; as well as A sealing protrusion is provided on a portion of the sealing surface to protrude from the sealing surface by a predetermined thickness in the pressing direction of the sealing block, so as to prevent the lead film from flowing along the width direction of the sealing surface.

2. The sealing device according to claim 1, wherein, The sealing surface includes: A first sealing surface, configured to seal the central portion of the lead film overlapping with the lead metal; and A second sealing surface is formed at both end portions of the first sealing surface in a stepped manner relative to the first sealing surface to seal the edge portions of the lead film.

3. The sealing device according to claim 2, wherein, The sealing protrusion is disposed on the second sealing surface.

4. The sealing device according to claim 2, wherein, The sealing protrusion has a shape that extends along a length direction perpendicular to the width direction of the second sealing surface.

5. The sealing device according to claim 4, wherein, The second sealing surface is provided with a plurality of sealing protrusions spaced apart in the width direction.

6. The sealing device according to claim 2, wherein, The sealing protrusion is formed on the end of the second sealing surface in the width direction.

7. The sealing device according to claim 2, wherein, The sealing protrusion includes: A first sealing protrusion is formed on the second sealing surface; and A second sealing protrusion is provided, which is spaced apart from the first sealing protrusion in the width direction of the second sealing surface.

8. The sealing device according to claim 7, wherein, The first sealing protrusion is formed at one end portion of the second sealing surface, and The second sealing protrusion is formed at the other end portion of the second sealing surface.

9. The sealing device according to claim 8, wherein, The sealing surface further includes a third sealing surface, which is positioned on the opposite side of the first sealing surface based on the second sealing surface, and seals the bag-like component. The sealing protrusion further includes a third sealing protrusion, which is disposed on the third sealing surface and extends from the second sealing protrusion.

10. The sealing device according to claim 1, wherein, The sealing blocks are configured as a pair of sealing blocks spaced apart from each other in the pressing direction.

Images