Gasket for suppressing flame release in case of thermal runaway and battery pack having same

Abstract

A gasket for suppressing flame release according to an embodiment of the present invention is a gasket disposed for sealing between an upper housing and a lower housing. The gasket comprises: a first tapered part including an inner surface and an outer surface tapered outwardly; and a second tapered part including an inner surface and an outer surface tapered outwardly and connected to the outside of the first tapered part. According to an embodiment of the present invention, the gasket and the battery pack can, during thermal runaway, prevent release of gas and particles and suppress flame release.

Description

Gasket for suppressing flame escape during thermal runaway and battery pack equipped with same

[0001] The present invention relates to a gasket and a battery pack having the same, and more particularly, to a gasket capable of suppressing flame leakage to the outside during thermal runaway and a battery pack having the same.

[0002] Secondary batteries, unlike primary batteries that cannot be recharged, are batteries that can be charged and discharged. They are used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) that are driven by electrical power sources.

[0003] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, i.e., unit battery cells, is approximately 2.5 V to 4.6 V. Therefore, when a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Furthermore, depending on the charge / discharge capacity required for the battery pack, multiple battery cells are connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be set in various ways depending on the required output voltage or charge / discharge capacity.

[0004] When configuring a battery pack by connecting multiple battery cells in series or parallel, it is common to first configure a battery module comprising at least one battery cell, preferably multiple battery cells, and then use at least one such battery module and add other components to configure the battery pack. Here, a battery module refers to a component in which multiple battery cells are connected in series or parallel, and a battery pack refers to a component in which multiple battery modules are connected in series or parallel to increase capacity and output, etc.

[0005] Typically, a vehicle battery pack is configured to have multiple battery modules or battery module assemblies arranged on the same plane to maintain structural stability.

[0006] Figures 1 to 3 illustrate a conventional battery pack (1), and as illustrated, the battery pack (1) includes an upper housing (10), a lower housing (20), a gasket (30) between the upper housing (10) and the lower housing (20), and a battery module (40) disposed therein.

[0007] However, in the case of overcharging, etc. in such a battery pack (1), high energy can flow instantaneously, and since the chemical activation of the positive electrode material is greatly increased due to overcharging or short circuit, it can react rapidly with the electrolyte, resulting in a large amount of gas and a thermal runaway phenomenon. In the case of such thermal runaway, the main gasket (30) can be damaged by flames and short circuits, which can cause flames to occur outside the battery pack.

[0008] The present invention aims to solve the problem of the prior art and to provide a gasket capable of suppressing flame leakage to the outside during thermal runaway and a battery pack having the same.

[0009] A gasket for suppressing flame leakage according to one embodiment of the present invention is a gasket arranged for sealing between an upper housing and a lower housing, characterized in that the gasket includes a first tapered portion including an inner surface and an outer surface formed to be tapered in an outward direction; and a second tapered portion including an inner surface and an outer surface formed to be tapered in an outward direction and connected to an outer side of the first tapered portion.

[0010] Additionally, the inner surface of the first tapered portion is formed in a concave shape in the middle.

[0011] In addition, the outer surface of the first tapered portion includes a first upper inclined surface portion that slopes downward toward the middle of the first tapered portion as it goes outward at the upper portion; and a first lower inclined surface portion that slopes toward the middle of the first tapered portion as it goes outward at the lower portion.

[0012] Additionally, the inner surface of the second tapered portion is formed in a concave shape in the middle.

[0013] In addition, the inner surface of the second tapered portion includes an upper inner surface at the top and a lower inner surface at the bottom, and the upper inner surface is formed in a concave shape that becomes more recessed from the top toward the middle of the second tapered portion, and the lower inner surface is formed in a concave shape that becomes more recessed from the bottom toward the middle of the second tapered portion.

[0014] In addition, the outer surface of the second tapered portion includes a second upper inclined surface portion that slopes downward toward the middle of the second tapered portion as it goes outward at the upper portion; and a second lower inclined surface portion that slopes downward toward the middle of the second tapered portion as it goes outward at the lower portion.

[0015] In addition, it further includes a third tapered portion that includes an inner surface and an outer surface formed to be tapered in an outward direction and is connected to the outer side of the second tapered portion.

[0016] Additionally, the inner surface of the third tapered portion is formed in a concave shape in the middle.

[0017] In addition, the inner surface of the third tapered portion includes an upper inner surface at the top and a lower inner surface at the bottom, and the upper inner surface is formed in a concave shape that becomes more recessed from the top toward the middle of the third tapered portion, and the lower inner surface is formed in a concave shape that becomes more recessed from the bottom toward the middle of the third tapered portion.

[0018] In addition, the outer surface of the third tapered portion includes a third upper inclined surface portion that slopes downward toward the middle of the third tapered portion as it goes outward at the upper portion; and a third lower inclined surface portion that slopes downward toward the middle of the second tapered portion as it goes outward at the lower portion.

[0019] A battery pack for suppressing flame leakage according to one embodiment of the present invention comprises: one or more battery modules; a case for accommodating the battery modules, including an upper housing and a lower housing coupled to the upper housing; and a gasket disposed between the upper housing and the lower housing; wherein the gasket comprises a first tapered portion including an inner surface and an outer surface tapered in an outward direction; and a second tapered portion including an inner surface and an outer surface tapered in an outward direction and connected to an outer side of the first tapered portion.

[0020] A battery pack for suppressing flame leakage according to another embodiment of the present invention comprises: a plurality of battery cells; a case for accommodating the battery cells, including an upper housing and a lower housing coupled to the upper housing; and a gasket disposed between the upper housing and the lower housing; wherein the gasket comprises a first tapered portion including an inner surface and an outer surface tapered in an outward direction; and a second tapered portion including an inner surface and an outer surface tapered in an outward direction and connected to an outer side of the first tapered portion.

[0021] The gasket and battery pack according to the present invention have the effect of preventing the leakage of gas and particles and suppressing the leakage of flames during thermal runaway.

[0022] Figure 1 is a drawing illustrating a conventional battery pack,

[0023] Figure 2 is a drawing showing a cross-sectional side view of the battery pack in Figure 1.

[0024] Figure 3 is a detailed drawing of the joining portion of the upper housing and the lower housing in Figure 2,

[0025] FIG. 4 is a drawing showing a cross-sectional side view of a battery pack in one embodiment of the present invention.

[0026] Figure 5 is a cross-sectional view of a gasket in one embodiment of the present invention.

[0027] Figure 6 is a perspective view of a portion of a gasket in one embodiment of the present invention.

[0028] FIG. 7 is a drawing for explaining that a gasket prevents the leakage of gas and particles in one embodiment of the present invention.

[0029] Figure 8 is a cross-sectional view of a gasket according to another embodiment of the present invention.

[0030] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques are not specifically described to avoid ambiguity in the interpretation of the present invention. Like reference numerals refer to like elements throughout the specification.

[0031] In order to clearly represent multiple layers and regions in the drawings, the thickness may be enlarged. Similar parts are designated by the same drawing reference numerals throughout the specification. When an element such as a layer, film, region, or plate is said to be "over" another element, this includes not only the case where it is "directly over" that element but also the case where there are other elements in between. Conversely, when an element is said to be "directly over" another element, this means that there are no other elements in between. Furthermore, when an element such as a layer, film, region, or plate is said to be "under" another element, this includes not only the case where it is "directly under" that element but also the case where there are other elements in between. Conversely, when an element is said to be "directly under" another element, this means that there are no other elements in between.

[0032] Hereinafter, a gasket for suppressing flame leakage during thermal runaway according to a preferred embodiment of the present invention and a battery pack having the same will be described in detail with reference to the attached drawings.

[0033] FIG. 4 is a cross-sectional view showing one side of a battery pack according to one embodiment of the present invention, FIG. 5 is a longitudinal cross-sectional view of a gasket according to one embodiment of the present invention, FIG. 6 is a perspective view of a portion of a gasket according to one embodiment of the present invention, FIG. 7 is a view for explaining that a gasket according to one embodiment of the present invention prevents leakage of gas and particles, and FIG. 8 is a longitudinal cross-sectional view of a gasket according to another embodiment of the present invention.

[0034] A gasket (300) according to one embodiment of the present invention can be placed for sealing between the upper housing (100) and the lower housing (200).

[0035] In addition, a battery pack (1000) for suppressing flame leakage during thermal runaway according to one embodiment of the present invention includes one or more battery modules (400), a case (50) accommodating the battery modules (400), and a gasket (300), and the case (50) may include an upper housing (100) and a lower housing (200).

[0036] Below, an example of a gasket (300) according to the present invention being applied to a battery pack (1000) is described.

[0037] A battery module (400) accommodated in a battery pack (1000) comprises a plurality of battery cells (not shown), and each battery cell may be, for example, a pouch-type battery cell.

[0038] For example, a battery module (400) may include a plurality of battery cells that are stacked on top of each other, and each battery cell may be provided with electrode leads at each of the front and rear ends, with a positive electrode lead at the front end and a negative electrode lead at the rear end. The plurality of battery cells within the battery module (400) may be stacked so as to be electrically connected to each other.

[0039] The battery cell is not limited to a pouch-shaped battery cell, and may be composed of other types of battery cells such as a cylindrical battery cell or a square battery cell, and a plurality of battery cells may be accommodated within the case of the battery module (400).

[0040] In the embodiment of the present invention, an example in which a plurality of battery modules (400) are accommodated inside a battery pack (1000) is shown, but a plurality of battery cells may be directly arranged inside the battery pack (1000).

[0041] The above case (50) is intended to accommodate a plurality of battery modules (400) or a plurality of battery cells, and may include an upper housing (100) and a lower housing (200).

[0042] The lower housing (200) can accommodate a plurality of battery modules (400) or a plurality of battery cells, and the upper housing (100) is coupled to the upper side of the lower housing (200) to form an internal space in which the battery modules (400) are accommodated inside the case (50).

[0043] A gasket (300) disposed between the upper housing (100) and the lower housing (200) may be used for sealing between the upper housing (100) and the lower housing (200). The gasket (300) may be disposed over the entire portion where the upper and lower housings (100, 200) are joined, and may be formed in a closed loop shape on a plane. In addition, a through hole into which a bolt or the like for fastening the upper and lower housings (100, 200) is inserted may be disposed along the longitudinal direction of the gasket (300).

[0044] In this embodiment, the gasket (300) can be formed by sequentially connecting a first tapered portion (310), a second tapered portion (320), and a third tapered portion (330) as shown in FIGS. 5 to 7.

[0045] The above first taper unit (310) may be positioned at the innermost side (in the inner direction of the battery pack (1000)) of the gasket (300) and may have an inner side (311) facing the inside of the battery pack (1000) and an outer side (312, 313) facing the outside of the battery pack (1000).

[0046] The inner surface (311) of the first tapered portion (310) may be formed in a concave shape in the middle as shown.

[0047] The outer surface (312, 313) of the first tapered portion (310) may have a shape that tapers as it goes outward (in the X-axis direction). The outer surface (312, 313) may include a first upper inclined surface portion (312) at the upper portion and a first lower inclined surface portion (313) at the lower portion.

[0048] The first upper inclined surface portion (312) may be formed to slope downward toward the middle (A) of the gasket (300) (first tapered portion (310)) as it goes outward, and the first lower inclined surface portion (313) may be formed to slope downward toward the middle (A) of the gasket (300) (first tapered portion (310)) as it goes outward.

[0049] Accordingly, the gap between the first upper slope portion (312) and the first lower slope portion (313) can be formed to gradually become smaller as it goes outward.

[0050] The second tapered portion (320) may be positioned on the outside of the first tapered portion (310) in the gasket (300) (in the outer direction of the battery pack (1000)), and may be positioned between the first tapered portion (310) and the third tapered portion (330).

[0051] The second taper portion (320) may have an inner surface (321a, 321b) facing the inside of the battery pack (1000) and an outer surface (322, 323) facing the outside of the battery pack (1000).

[0052] The inner side surfaces (321a, 321b) of the second tapered portion (320) may be formed in a shape in which the middle is concave as illustrated. The inner side surfaces (321a, 321b) may include an upper inner side surface (321a) disposed above the inner side surfaces (321a, 321b) and a lower inner side surface (321b) disposed below the inner side surfaces (321a, 321b). The upper inner side surface (321a) may be formed to become more concave as it goes from the upper end of the upper inner side surface (321a) to the middle (A) of the second tapered portion (320), and the lower inner side surface (321b) may be formed to become more concave as it goes from the lower end of the lower inner side surface (321b) to the middle (A) of the second tapered portion (320). The lower end of the upper inner side (321a) can be connected to the first upper inclined surface (312) of the first tapered portion (310), and the upper end of the lower inner side (321b) can be connected to the first lower inclined surface (313) of the first tapered portion (310).

[0053] The outer surface (322, 323) of the second tapered portion (320) may have a shape that becomes tapered as it goes outward (in the X-axis direction). The outer surface (322, 323) of the second tapered portion (320) may include a second upper inclined surface portion (322) at the upper portion and a second lower inclined surface portion (323) at the lower portion.

[0054] The second upper inclined surface portion (322) may be formed to slope downward toward the middle (A) of the gasket (300) (second tapered portion (320)) as it goes outward, and the second lower inclined surface portion (323) may be formed to slope downward toward the middle (A) of the gasket (300) (second tapered portion (320)) as it goes outward.

[0055] Accordingly, the gap between the second upper slope portion (322) and the second lower slope portion (323) can be formed to gradually become smaller as it goes outward.

[0056] The third tapered portion (330) may be positioned on the outside of the second tapered portion (320) (in the outer direction of the battery pack (1000)) and may be positioned on the outermost side of the gasket (300).

[0057] The third taper portion (330) may have an inner surface (331a, 331b) facing the inside of the battery pack (1000) and an outer surface (332, 333) facing the outside of the battery pack (1000).

[0058] The inner side surfaces (331a, 331b) of the third tapered portion (330) may be formed in a shape in which the middle is concave as illustrated. The inner side surfaces (331a, 331b) may include an upper inner side surface (331a) disposed above the inner side surfaces (331a, 331b) and a lower inner side surface (331b) disposed below the inner side surfaces (331a, 331b). The upper inner side surface (321a) may be formed in a shape that becomes more concave from the upper end of the upper inner side surface (321a) toward the middle (A) of the third tapered portion (330), and the lower inner side surface (321b) may be formed in a shape that becomes more concave from the lower end of the lower inner side surface (321b) toward the middle (A) of the third tapered portion (330). The lower end of the upper inner surface (331a) can be connected to the second upper inclined surface portion (322) of the second tapered portion (320), and the upper end of the lower inner surface (331b) can be connected to the second lower inclined surface portion (323) of the second tapered portion (320).

[0059] The outer surface (332, 333) of the third tapered portion (330) may have a shape that becomes tapered as it goes outward (in the X-axis direction). The outer surface (332, 333) of the third tapered portion (330) may include a third upper inclined surface portion (332) at the upper portion and a third lower inclined surface portion (333) at the lower portion.

[0060] The third upper inclined surface portion (332) may be formed to slope downward toward the middle (A) of the gasket (300) (third tapered portion (330)) as it goes outward, and the third lower inclined surface portion (333) may be formed to slope downward toward the middle (A) of the gasket (300) (third tapered portion (330)) as it goes outward.

[0061] Accordingly, the gap between the third upper slope portion (332) and the third lower slope portion (333) can be formed to gradually become smaller as it goes outward.

[0062] In the third tapered portion (330), the third upper inclined portion (332) and the third lower inclined portion (333) can be connected to each other. As illustrated, the lower end of the third upper inclined portion (332) can be connected to the upper end of the third lower inclined portion (333) and the middle of the outer surface (332, 333) of the third tapered portion (330).

[0063] In this way, in this embodiment, the gasket (300) may be configured in a structure in which a first tapered portion (310), a second tapered portion (320), and a third tapered portion (330) are sequentially connected from the inside to the outside of the battery pack (1000) (X-axis direction in the drawing).

[0064] The first taper portion (310), the second taper portion (320), and the third taper portion (330) can be formed in a vertically symmetrical structure based on the middle (A).

[0065] The gasket (300) can be formed by sequentially connecting a plurality of taper units in this manner. In this embodiment, an example is shown in which three taper units are connected, but it can also be formed by connecting two taper units.

[0066] The material of the gasket (300) may be made of synthetic resin such as rubber, urethane, metal, or other materials.

[0067] A gasket (300) having the configuration described above is placed between the upper housing (100) and the lower housing (200) and is coupled with the upper and lower housings (100, 200) using a bolt (150), a washer (151) and a nut (152).

[0068] When gas and particles are generated inside the battery pack (1000) due to ignition, etc., the pressure inside the pack increases, and a gap may be generated between the upper housing and the lower housing due to the increased pressure, and the gas and particles may be discharged to the outside due to this gap.

[0069] In this embodiment, a gasket (300) having the configuration described above is placed between the upper housing (100) and the lower housing (200), thereby forming a structure in which it is difficult for gas and particles inside the battery pack (1000) to escape, thereby suppressing flame leakage.

[0070] Specifically, as illustrated in FIG. 7, when gas and particles inside the battery pack (1000) move to the first tapered portion (310) of the gasket (300), they come into contact with the inner surface (311) of the first tapered portion (310) and move along the inner surface (311). Since the inner surface (311) is formed in a concave shape, the gas and particles move along the upper or lower portion of the inner surface (311) and move in the inward direction rather than the outward direction of the pack (1000). The upper portion of the inner surface (311) is in contact with the upper housing (100), and the lower portion of the inner surface (311) is in contact with the lower housing (200), making it difficult for them to escape to the outside.

[0071] And, even when the gas and particles pass through the first tapered portion (310), they pass through the first upper inclined portion (312) and the first lower inclined portion (313) and meet the upper and lower inner surfaces (321a, 321b) of the second tapered portion (320), and since the upper and lower inner surfaces (321a, 321b) are formed in a concave shape, the gas and particles move in the inner direction rather than the outer direction of the pack (1000) while moving along the upper and lower inner surfaces (321a, 321b), and the upper part of the upper inner surface (321a) is in contact with the upper housing (100) and the lower part of the lower inner surface (321b) is in contact with the lower housing (200), making it difficult for them to escape to the outside.

[0072] And, even when the gas and particles pass through the second tapered portion (320), they pass through the second upper inclined portion (322) and the second lower inclined portion (323) and meet the upper and lower inner surfaces (331a, 331b) of the third tapered portion (330), and since the upper and lower inner surfaces (331a, 331b) are formed in a concave shape, the gas and particles move in the inner direction rather than the outer direction of the pack (1000) while moving along the upper and lower inner surfaces (331a, 331b), and the upper part of the upper inner surface (331a) is in contact with the upper housing (100) and the lower part of the lower inner surface (331b) is in contact with the lower housing (200), making it difficult for them to escape to the outside.

[0073] Meanwhile, Fig. 8 is a cross-sectional view of a gasket (300) according to another embodiment of the present invention. The gasket (300) according to another embodiment of the present invention may include a reinforcing member (350) arranged in the middle of the gasket (300).

[0074] The reinforcing material (350) may be made of a different material from the gasket (300), and the reinforcing material (350) may be placed inside the gasket (300) to reinforce the rigidity of the gasket (300). For example, the body of the gasket (300) may be made of rubber or a synthetic resin such as urethane, and the reinforcing material (350) may be made of a metal such as steel, but is not limited thereto, and may include carbon fiber, fiber-reinforced plastic, carbon fiber-reinforced plastic, etc.

[0075] In this embodiment, the reinforcing material (350) may be formed to extend from the inside to the outside (X-axis direction) along the center line (A) of the gasket (300), for example, and may be formed in a form in which the gasket (300) body wraps around it. As another example, the gasket (300) body may not wrap around the reinforcing material (350), but may be divided into upper and lower parts based on the reinforcing material (350). The reinforcing material (350) may be formed from the first tapered portion (310) through the second tapered portion (320) to the inside of the third tapered portion (330). The reinforcing material (350) may extend along the longitudinal direction of the gasket (300), and the width (X-axis direction) of the reinforcing material (350) may be at least half the width of the gasket (300).

[0076] Additionally, as another example, the reinforcing member (350) may be placed only in one of the first to third tapered sections (310, 320, 330), or for example, may be placed only in the second tapered section (320), and the cross-section of the reinforcing member (350) may be circular, square, polygonal, etc.

[0077] In this way, the gasket (300) may be made of dual materials or triple materials.

[0078] Although the present invention has been described with reference to preferred embodiments as described above, it is not limited to the above embodiments, and various changes and modifications may be made by a person having ordinary skill in the art to which the invention pertains within a scope that does not depart from the spirit of the present invention.

[0079] The present invention can provide a gasket capable of suppressing flame leakage to the outside during thermal runaway and a battery pack having the same.

Claims

1. A gasket placed for sealing between the upper housing and the lower housing, The above gasket is A first tapered portion including an inner surface and an outer surface formed to taper in an outward direction; and A second tapered portion including an inner surface and an outer surface formed to taper outwardly and connected to the outer side of the first tapered portion; A gasket for suppressing flame leakage, characterized in that it includes:

2. In paragraph 1, A gasket for suppressing flame leakage, in which the inner surface of the first tapered portion is formed in a concave shape in the middle.

3. In paragraph 1, A gasket for suppressing flame leakage, the outer surface of the first tapered portion including a first upper inclined surface portion that slopes downward toward the middle of the first tapered portion as it goes outward at the upper portion; and a first lower inclined surface portion that slopes toward the middle of the first tapered portion as it goes outward at the lower portion.

4. In paragraph 1, A gasket for suppressing flame leakage, in which the inner surface of the second tapered portion is formed in a concave shape in the middle.

5. In paragraph 4, The inner surface of the second tapered portion includes an upper inner surface at the top and a lower inner surface at the bottom, The upper inner surface is formed in a concave shape from the top toward the middle of the second tapered portion. A gasket for suppressing flame leakage, the lower inner surface of which is formed in a concave shape from the bottom toward the middle of the second tapered portion.

6. In paragraph 1, A gasket for suppressing flame leakage, the outer surface of the second tapered portion including a second upper inclined surface portion that slopes downward toward the middle of the second tapered portion as it goes outward at the upper portion; and a second lower inclined surface portion that slopes toward the middle of the second tapered portion as it goes outward at the lower portion.

7. In paragraph 1, A gasket for suppressing flame leakage, further comprising an inner surface and an outer surface formed to taper outwardly, and a third tapered portion connected to the outer side of the second tapered portion.

8. In paragraph 7, A gasket for suppressing flame leakage, in which the inner surface of the third tapered portion is formed in a concave shape in the middle.

9. In paragraph 8, The inner surface of the third tapered portion includes an upper inner surface at the top and a lower inner surface at the bottom, The upper inner surface is formed in a concave shape from the top toward the middle of the third tapered portion. A gasket for suppressing flame leakage, the lower inner surface of which is formed in a concave shape from the bottom toward the middle of the third tapered portion.

10. In paragraph 7, A gasket for suppressing flame leakage, the outer surface of the third tapered portion including a third upper inclined surface portion that slopes downward toward the middle of the third tapered portion as it goes outward at the upper portion; and a third lower inclined surface portion that slopes downward toward the middle of the second tapered portion as it goes outward at the lower portion.

11. In paragraph 1, The above gasket is a gasket for suppressing flame leakage that further includes a reinforcing material of a different material in the middle of the gasket.

12. One or more battery modules; A case accommodating the battery module, including an upper housing and a lower housing coupled to the upper housing; and A gasket disposed between the upper housing and the lower housing; Including, The above gasket is A first tapered portion including an inner surface and an outer surface formed to taper in an outward direction; and A second tapered portion including an inner surface and an outer surface formed to taper outwardly and connected to the outer side of the first tapered portion; A battery pack for suppressing flame outflow, characterized by including:

13. In paragraph 12, A battery pack for suppressing flame leakage, wherein the inner surface of the first tapered portion is formed in a concave shape in the middle.

14. In paragraph 12, A battery pack for suppressing flame outflow, wherein the outer surface of the first tapered portion includes a first upper inclined surface portion that slopes downward toward the middle of the first tapered portion as it goes outward at the upper portion; and a first lower inclined surface portion that slopes downward toward the middle of the first tapered portion as it goes outward at the lower portion.

15. In paragraph 12, The inner surface of the second tapered portion includes an upper inner surface at the top and a lower inner surface at the bottom, The upper inner surface is formed in a concave shape from the top toward the middle of the second tapered portion. A battery pack for suppressing flame leakage, wherein the lower inner surface is formed in a concave shape from the bottom to the middle of the second tapered portion.

16. In paragraph 12, A battery pack for suppressing flame outflow, wherein the outer surface of the second tapered portion includes a second upper inclined surface portion that slopes downward toward the middle of the second tapered portion as it goes outward at the upper portion; and a second lower inclined surface portion that slopes toward the middle of the second tapered portion as it goes outward at the lower portion.

17. In paragraph 12, A battery pack for suppressing flame leakage, wherein the gasket further includes an inner surface and an outer surface formed to be tapered in an outward direction, and a third tapered portion connected to the outer side of the second tapered portion.

18. In paragraph 17, The inner surface of the third tapered portion includes an upper inner surface at the top and a lower inner surface at the bottom, The upper inner surface is formed in a concave shape from the top toward the middle of the third tapered portion. A battery pack for suppressing flame leakage, wherein the lower inner surface is formed in a concave shape from the bottom to the middle of the third tapered portion.

19. In paragraph 17, A battery pack for suppressing flame outflow, wherein the outer surface of the third tapered portion includes a third upper inclined surface portion that slopes downward toward the middle of the third tapered portion as it goes outward at the upper portion; and a third lower inclined surface portion that slopes downward toward the middle of the second tapered portion as it goes outward at the lower portion.

20. In paragraph 12, A battery pack for suppressing flame leakage, wherein the gasket further includes a reinforcing material of a different material in the middle of the gasket.

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