Battery cell and battery pack comprising same

Abstract

A battery cell according to an embodiment of the present invention comprises: an electrode assembly comprising a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; a plurality of first taping portions which are spaced apart from each other in the lengthwise direction of the electrode assembly and surround the outer surface of the electrode assembly; a battery case accommodating the electrode assembly; and a plurality of second taping portions which are spaced apart from each other in the lengthwise direction of the electrode assembly and attached to one side surface of the battery case, wherein at least one of the plurality of first taping portions and at least one of the plurality of second taping portions overlap each other. A battery pack according to another embodiment of the present invention comprises the battery cell described above.

Description

Battery cell and battery pack including the same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0009552 filed January 22, 2025, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] The present invention relates to a battery cell and a battery pack including the same, and more specifically, to a battery cell and a battery pack including the same designed such that the direction in which a flame generated inside the battery cell is initially ejected to the outside of the battery cell is consistent.

[0004] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to charge and discharge freely with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density.

[0005] Generally, lithium secondary batteries can be classified according to the shape of the casing into cylindrical or prismatic secondary batteries in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries in which the electrode assembly is embedded in a pouch of aluminum laminate sheet.

[0006] Recently, with the increasing need for high-capacity secondary battery structures and the utilization of secondary batteries as energy storage sources, there is a growing demand for medium-to-large modular battery packs that aggregate battery modules in which multiple secondary batteries are connected in series or parallel. In these battery modules, capacity and output are enhanced by connecting multiple battery cells in series or parallel to form a stack of battery cells. Furthermore, multiple battery modules can be mounted together with various control and protection systems, such as a Battery Management System (BMS) and a cooling system, to form a battery pack.

[0007] Since battery packs consist of a structure composed of multiple battery modules, the safety and operational efficiency of the battery pack may be compromised if some of the battery modules experience overvoltage, overcurrent, or overheating. In particular, as battery pack capacity is increasingly trending toward improving driving range and consequently internal energy is also rising, it is necessary to design a structure that satisfies strengthening safety standards and ensures the safety of the vehicle and the driver.

[0008] In this regard, when a flame is generated inside a battery cell due to a phenomenon such as thermal runaway, there is a need to delay or prevent the additional occurrence of heat propagation to battery cells located adjacent to the affected cell.

[0009] The problem to be solved by the present invention is to provide a battery cell designed such that the direction in which a flame generated inside the battery cell is initially ejected to the outside of the battery cell is consistent, and a battery pack including the same.

[0010] The problems that the present invention aims to solve are not limited to those described above, and problems not mentioned will be clearly understood by those skilled in the art from this specification and the attached drawings.

[0011] A battery cell according to one embodiment of the present invention comprises: an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; a plurality of first taping portions spaced apart from each other along the longitudinal direction of the electrode assembly and covering the outer surface of the electrode assembly; a battery case accommodating the electrode assembly; and a plurality of second taping portions spaced apart from each other along the longitudinal direction of the electrode assembly and attached to one side of the battery case, wherein at least one of the plurality of first taping portions and at least one of the plurality of second taping portions overlap each other.

[0012] The plurality of first taping parts may have a greater number than the plurality of second taping parts, and the plurality of second taping parts may all overlap the plurality of first taping parts located at corresponding positions.

[0013] The plurality of first taping parts and the plurality of second taping parts are of the same number, and the plurality of first taping parts and the plurality of second taping parts may overlap each other at corresponding positions.

[0014] The battery case may include a storage portion in which the electrode assembly is accommodated, and a side portion that extends outwardly from the storage portion and is sealed after the electrode assembly is accommodated inside the battery case.

[0015] The plurality of second taping portions may be spaced apart from each other on the side portions.

[0016] The plurality of second taping portions may extend across the side portions to the front and rear surfaces of the storage portion.

[0017] The above side portion may be a portion formed extending outward from the storage portion that is folded at least twice.

[0018] A flame exhaust channel is formed in the direction toward the side portion inside the battery case, and the flame exhaust channel is formed between portions located adjacent to each other among the plurality of first taping portions and the plurality of second taping portions, and may not be formed between the first taping portions and the second taping portions that overlap each other.

[0019] The larger the area where the first taping part and the second taping part overlap each other, the wider the width of the flame exhaust path can be.

[0020] Depending on the area where the first taping part and the second taping part overlap each other, the discharge direction of the flame discharge path can be controlled.

[0021] A battery pack according to another embodiment of the present invention includes the battery cell described above.

[0022] According to embodiments, the present invention comprises a battery cell and a battery pack including the same, wherein at least one of the first taping portions among the plurality of first taping portions and at least one of the plurality of second taping portions overlap each other, so that the direction in which a flame generated inside the battery cell is initially ejected to the outside of the battery cell can be consistent.

[0023] The effects of the present invention are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the accompanying drawings.

[0024] FIG. 1 is a perspective view showing an electrode assembly included in a battery cell according to one embodiment of the present invention.

[0025] FIG. 2 is a perspective view showing a battery cell in which the electrode assembly of FIG. 1 is accommodated.

[0026] FIG. 3 is a perspective view showing the direction in which flames are ejected to the outside of the battery cell when flames are generated inside the battery cell of FIG. 2.

[0027] FIG. 4 is a perspective view showing the direction in which flames are ejected to the outside of the battery cell when flames are generated inside the battery cell according to a comparative example.

[0028] Hereinafter, various 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 present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0029] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0030] Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings.

[0031] Furthermore, throughout the specification, when a part is described as “comprising” a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0032] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.

[0033] FIG. 1 is a perspective view showing an electrode assembly included in a battery cell according to one embodiment of the present invention. FIG. 2 is a perspective view showing a battery cell in a state in which the electrode assembly of FIG. 1 is accommodated.

[0034] Referring to FIGS. 1 and 2, a battery cell (200) according to one embodiment of the present invention includes an electrode assembly (100) comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode.

[0035] Here, the electrode assembly (100) has an anode, a cathode, and a separator alternately stacked, although not illustrated in detail in FIG. 1. Here, the separator may be stacked between the anode and the cathode, or may be folded in a shape that wraps around the anode and / or the cathode.

[0036] The electrode assembly (100) may include an electrode lead (120) to which electrode tabs extending from a plurality of positive electrodes and a plurality of negative electrodes are joined, although not illustrated in detail in FIG. 1. For example, as shown in FIG. 1, the electrode lead (120) may extend to each end of the electrode assembly (100), and the electrode lead (120) may be classified as a positive lead or a negative lead depending on the polarity of the positive and negative electrodes. However, the position of the electrode lead (120) is not limited thereto and may extend together to one end of the electrode assembly (100) as in FIG. 1.

[0037] The electrode assembly (100) may include a lead film (130) located on the upper and lower portions of the electrode lead (120). Here, as the electrode assembly (100) is mounted on the battery case (210), the lead film (130) may be sealed by a sealing portion (211s) together with the outer periphery of the battery case (210).

[0038] Additionally, the battery cell (200) according to the present embodiment includes a battery case (210) that accommodates an electrode assembly (100). More specifically, the battery case (210) may be a laminate sheet comprising a resin layer and a metal layer. More specifically, the battery case (210) may be made of a laminate sheet and may be composed of an outer resin layer forming the outermost layer, a barrier metal layer that prevents the penetration of a material, and an inner resin layer for sealing.

[0039] That is, based on the electrode assembly (100) inside the battery case (210), the inner resin layer is located at the innermost position, the outer resin layer is located at the outermost position, and the metal layer can be located between the inner resin layer and the outer resin layer.

[0040] The outer resin layer may possess excellent tensile strength and weather resistance relative to its thickness and electrical insulation properties to protect the electrode assembly from the outside. This outer resin layer may include polyethylene terephthalate (PET) resin or nylon resin. The metal layer may prevent air, moisture, etc. from entering the interior of the pouch-type secondary battery. This metal layer may include aluminum (Al). The inner resin layers may be thermally fused together by applied heat and / or pressure while the electrode assembly is embedded. This inner resin layer may include casted polypropylene (CPP) or polypropylene (PP).

[0041] The battery case (210) may include a storage portion (211d) in which an electrode assembly (100) is accommodated, and a side portion (211c) that extends outward from the storage portion (211d) and is sealed after the electrode assembly (100) is accommodated inside the battery case (210). Here, the side portion (211c) may be a portion in which the portion extending outward from the storage portion (211d) is folded at least twice.

[0042] More specifically, the battery case (210) may be divided into two parts, and a concave-shaped storage portion (211d) may be formed in at least one of the two parts so that an electrode assembly (100) can be seated thereon. Along the outer circumference of this storage portion (211d), the inner resin layers of the two parts of the battery case (210) may be bonded together to form a sealing portion (211s). In this way, the battery case (210) is sealed so that a battery cell (200) can be manufactured.

[0043] Referring to FIGS. 1 and 2, in the battery cell (200) according to the present embodiment, the two electrode leads (120) of the electrode assembly (100) may have a structure in which they face each other, and the ends (220) of the two electrode leads (120) protrude from one end (211a) and the other end (211b) of the cell body (215), respectively. As previously described, as another embodiment, a structure in which the ends (220) of the two electrode leads (120) of the battery cell (200) both protrude in one direction is also possible.

[0044] Additionally, the battery cell (200) can be manufactured by bonding the two ends (211a, 211b) of the battery case (210) and the side portion (211c) connecting them, while the electrode assembly (100) is housed in the battery case (210). In other words, the battery cell (110) according to one embodiment of the present invention has a total of three sealing portions (211s), and the sealing portions (211s) are sealed by a method such as fusion, and the other side portion may be made of a folding portion (215). That is, the battery cell (200) according to the present embodiment may be a pouch-type secondary battery in which the electrode assembly (100) is housed inside the battery case (210) and the outer periphery of the battery case (210) is sealed to form the sealing portions (211s).

[0045] In FIG. 2, only the sealing portions (211s) formed on both ends (211a, 211b) of the battery case (210) are shown, and the sealing portion is not shown on the side facing the folding portion (215), but the side portion (211c) facing the folding portion (215) may be folded at least once after the sealing is completed for space utilization.

[0046] For example, when the side portion (211c) is folded at least once after sealing is completed, one end of the side portion (211c) may be in close contact with the outer circumference of the storage portion (211d) or the outer surface of the storage portion (211d).

[0047] Referring to FIGS. 1 and 2, in a battery cell (200) according to the present embodiment, the electrode assembly (100) may include a plurality of first taping portions (140) that are spaced apart from each other along the length direction of the electrode assembly (100) and wrap around the outer surface of the electrode assembly (100). That is, the plurality of first taping portions (140) may wrap around the entire circumference of the electrode assembly (100). For example, as shown in FIG. 1, the first taping portions (140) may wrap around the entire circumference of the electrode assembly (100) along the width direction (z-axis direction) and the thickness direction (x-axis direction) of the electrode assembly (100).

[0048] In addition, the plurality of first taping portions (140) are not limited to five as shown in FIG. 1, and the number may be changed as needed.

[0049] Accordingly, the battery cell (200) according to the present embodiment includes a plurality of first taping portions (140) that extend along the outer surface of the electrode assembly (100), thereby allowing the internal components of the electrode assembly (100) to be stably maintained in an aligned state.

[0050] Additionally, the battery cell (200) may include a plurality of second taping portions (230) that are spaced apart from each other along the longitudinal direction of the electrode assembly (100) and attached to one side of the battery case (210). That is, the plurality of second taping portions (230) may be spaced apart from each other on the side portion (211c) of the battery case (210). For example, as shown in FIG. 2, the plurality of second taping portions (230) may extend across the side portion (211c) to the front and rear of the storage portion (211d). For example, as shown in FIG. 2, the second taping portion (230) may wrap around the side portion (211c) along the width direction (x-axis direction) and the height direction (z-axis direction) of the battery cell (200).

[0051] In addition, the number of second taping parts (230) is not limited to four as shown in FIG. 2, and the number may be changed as needed.

[0052] Accordingly, the battery cell (200) according to the present embodiment includes a second taping portion (230) that wraps around the side portion (211c) of the battery case (210), thereby allowing the side portion (211c) to be stably fixed to the outer surface of the battery case (210).

[0053] Here, the first taping part (140) and the second taping part (230) may be made of a hot-melt film or adhesive tape. For example, the first taping part (140) and the second taping part (230) may be made of materials such as PET (polyethylene terephthalate), OPP (Oriented Polypropylene), PI (polyimide), and PU (Polyurethane). However, the materials of the first taping part (140) and the second taping part (230) are not limited thereto, and any polymer material having sufficient elasticity and adhesive strength to wrap around the outer surface of the electrode assembly (100) or battery case (210) may be included in this embodiment.

[0054] Referring to FIG. 2, in a battery cell (200) according to the present embodiment, at least one of the first taping portions (140) among the plurality of first taping portions (140) and at least one of the second taping portions (230) among the plurality of second taping portions (230) are superimposed on each other. Here, the meaning of being superimposed may be that at least a portion of the first taping portion (140) and at least a portion of the second taping portion (230) face each other.

[0055] For example, as shown in FIG. 2, a plurality of first taping sections (140) may have a greater number than a plurality of second taping sections (230). For example, as shown in FIG. 2, there may be 5 first taping sections (140) and 4 second taping sections (230). In this case, the plurality of second taping sections (230) may all overlap with the plurality of first taping sections (140) located at corresponding positions. As shown in FIG. 2, the area overlapping between the first taping sections (140) and the second taping sections (230) may vary depending on the location, but unlike FIG. 2, the first taping sections (140) and the second taping sections (230) may be arranged so that the area overlapping between them is the same.

[0056] In another example, unlike FIG. 2, the plurality of first taping portions (140) may be equal in number to the plurality of second taping portions (230), and the plurality of first taping portions (140) and the plurality of second taping portions (230) may overlap each other at corresponding positions. Even in this case, the area overlapping between the first taping portions (140) and the second taping portions (230) may vary depending on the position, but the first taping portions (140) and the second taping portions (230) may be arranged so that the area overlapping between them is the same.

[0057] Accordingly, in the battery cell (200) according to the present embodiment, the area wrapped by a plurality of first taping portions (140) and a plurality of second taping portions (230) based on the side portion (211c) can be minimized.

[0058] In particular, when a flame is generated due to a phenomenon such as thermal runaway inside the battery cell (200), the flame generated inside the battery cell (200) is likely to be discharged toward the sealing portion (211s) of the battery case (210), where the sealing force is relatively low. At this time, if the flame is discharged in the y-axis direction toward the two ends (211a, 211b) of the battery case (210) among the sealing portions (211s), there is a problem that thermal propagation (TP) may occur to other battery cells placed adjacent to the battery cell (200).

[0059] At this time, in the battery cell (200) according to the present embodiment, a plurality of first taping portions (140) and a plurality of second taping portions (230) overlap each other, so that flames can be induced to be discharged in the z-axis direction through the area not covered by the plurality of first taping portions (140) and the plurality of second taping portions (230) in the side portion (211c), and heat propagation to adjacent battery cells can also be effectively prevented.

[0060] FIG. 3 is a perspective view showing the direction in which flames are ejected to the outside of the battery cell when flames are generated inside the battery cell of FIG. 2. FIG. 4 is a perspective view showing the direction in which flames are ejected to the outside of the battery cell when flames are generated inside the battery cell according to a comparative example.

[0061] Referring to FIG. 3, in the battery cell (200) according to the present embodiment, a flame exhaust path may be formed in a direction toward the side portion (211c) inside the battery case (210). More specifically, the flame exhaust path may be formed between adjacent portions among a plurality of first taping portions (140) and a plurality of second taping portions (230), and may not be formed between the first taping portions (140) and the second taping portions (230) that overlap each other.

[0062] In the battery cell (200) according to the present embodiment, as shown in FIG. 3, a plurality of second taping portions (230) are all superimposed on a plurality of first taping portions (140), so that the flame exhaust passage may be formed between the first taping portions (140) and the second taping portions (230) which are adjacent to each other.

[0063] Here, the larger the area where the first taping part (140) and the second taping part (230) overlap each other, the wider the flame exhaust path may be. It may be preferable that the area where the first taping part (140) and the second taping part (230) overlap each other be formed to overlap as much as possible, thereby maximizing the width of the flame exhaust path.

[0064] For example, as shown in FIG. 3, among the plurality of first taping parts (140) and the plurality of second taping parts (230), the first taping part (140) and the second taping part (230) located adjacent to both ends (211a) of the battery case (210) may have a relatively large overlapping area, and the width of the flame exhaust path formed between the first taping part (140) and the second taping part (230) may be relatively large. Additionally, among the plurality of first taping parts (140) and the plurality of second taping parts (230), the first taping part (140) and the second taping part (230) located adjacent to the center of the battery case (210) may have a relatively small overlapping area, and the width of the flame exhaust path formed between the first taping part (140) and the second taping part (230) may be relatively small.

[0065] However, it is not limited to FIG. 3, and among the plurality of first taping portions (140) and the plurality of second taping portions (230), the first taping portion (140) and the second taping portion (230) located adjacent to the center of the battery case (210) may also overlap with the first taping portion (140) and the second taping portion (230) located adjacent to both ends (211a) of the battery case (210) with the same area.

[0066] In addition, the discharge direction of the flame discharge path can be adjusted according to the area where the first taping part (140) and the second taping part (230) overlap each other.

[0067] For example, as shown in FIG. 3, among the plurality of first taping portions (140) and the plurality of second taping portions (230), the first taping portion (140) and the second taping portion (230) located adjacent to both ends (211a) of the battery case (210) may have a relatively large overlapping area, and the discharge direction of the flame discharge path formed between the first taping portion (140) and the second taping portion (230) may coincide with the width direction (y-axis direction) of the battery cell (200). Additionally, among the plurality of first taping portions (140) and the plurality of second taping portions (230), the first taping portion (140) and the second taping portion (230) located adjacent to the center of the battery case (210) may have a relatively small overlapping area, and the discharge direction of the flame discharge path formed between the first taping portion (140) and the second taping portion (230) may be inclined at a predetermined angle in the width direction (y-axis direction) of the battery cell (200).

[0068] Accordingly, in the battery cell (200) according to the present embodiment, a flame exhaust path is formed in a direction toward the side portion (211c) inside the battery case (210), and the resistance of the plurality of first taping portions (140) and the plurality of second taping portions (230) to the flame exhaust path can be minimized.

[0069] That is, although the battery cell (200) according to the present embodiment includes a plurality of first taping portions (140) and a plurality of second taping portions (230), it can effectively induce flames to be discharged in the z-axis direction through the area not covered by the plurality of first taping portions (140) and the plurality of second taping portions (230) in the side portion (211c), and can also effectively prevent heat propagation to adjacent battery cells.

[0070] Referring to FIG. 4, in a battery cell (200') according to a comparative example, the flame exhaust path may be formed between adjacent portions among a plurality of first taping portions (140') and a plurality of second taping portions (230'), but the path formed between the adjacent first taping portions (140') and the second taping portions (230') may not be easy for the flame inside the battery cell (200') to be exhausted.

[0071] More specifically, in the battery cell (200') according to the comparative example, as shown in FIG. 4, a plurality of second taping portions (230) are not overlapped with the first taping portion (140) but are arranged between adjacent first taping portions (140). That is, unlike the battery cell (200) according to the present embodiment described above in FIG. 1 to 3, the battery cell (200') according to the comparative example arranges a plurality of second taping portions (230') without considering the position of the plurality of first taping portions (140).

[0072] At this time, the second taping portion (230) that is not superimposed on the first taping portion (140) may act as a resistance to the flame exhaust passage formed between a pair of adjacent first taping portions (140). In addition, the gap between the adjacent second taping portion (230) and the first taping portion (140) is also relatively small, so even if the flame exhaust passage is formed between the adjacent second taping portion (230) and the first taping portion (140), it may be difficult for the flame to be exhausted through the passage.

[0073] That is, in the battery cell (200') according to the comparative example, the flame exhaust path may not be sufficiently formed in the side portion (211c), and there is a problem that the flame generated inside the battery cell (200') is more likely to be discharged toward both ends (211a) rather than the side portion (211c), and this problem may cause heat propagation to adjacent battery cells (200').

[0074] In contrast, the battery cell (200) according to the present embodiment described in FIGS. 1 to 3 has a structure in which the plurality of first taping portions (140) and the plurality of second taping portions (230) overlap each other, taking into account the positions of the plurality of first taping portions (140), so that the flame exhaust path of the battery cell (200) can be consistently directed toward the side portion (211c). In addition, as the ejection direction of the flame exhaust path is consistent, there is an advantage that heat propagation to adjacent battery cells (200) is also effectively prevented, and it is easy to design a flame exhaust system in a battery module or battery pack in which the battery cell (200) is mounted.

[0075] A battery pack according to another embodiment of the present invention includes the battery cell (200) described above. More specifically, a battery pack according to this embodiment may be formed by packaging a plurality of battery cells (200) in a stacked state in one direction within a pack case.

[0076] The battery cell and battery pack containing the same described above can be applied to various devices. Such devices may be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, but the present invention is not limited thereto and can be applied to various devices capable of using the battery cell and battery pack containing the same, and this also falls within the scope of the rights of the present invention.

[0077] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

[0078] [Explanation of the symbol]

[0079] 100: Electrode assembly

[0080] 140: 1st taping section

[0081] 200: Battery cell

[0082] 210: Battery Case

[0083] 230: Second taping section

Claims

1. An electrode assembly comprising an anode, a cathode, and a separator interposed between the anode and the cathode; A plurality of first taping portions spaced apart from each other along the longitudinal direction of the electrode assembly and wrapping the outer surface of the electrode assembly; A battery case accommodating the above electrode assembly; and It includes a plurality of second taping portions spaced apart from each other along the longitudinal direction of the electrode assembly and attached to one side of the battery case, A battery cell in which at least one of the plurality of first taping parts and at least one of the plurality of second taping parts overlap each other.

2. In Paragraph 1, The plurality of first taping parts has a greater number than the plurality of second taping parts, A battery cell in which the plurality of second taping portions are all superimposed on the plurality of first taping portions located at corresponding positions.

3. In Paragraph 1, The plurality of first taping parts and the plurality of second taping parts are the same number, and A battery cell in which the plurality of first taping parts and the plurality of second taping parts are overlapped at corresponding positions.

4. In Paragraph 1, The above battery case is, A housing portion in which the above electrode assembly is accommodated, and A battery cell comprising a side portion that extends outwardly from the storage portion and is sealed after the electrode assembly is received inside the battery case.

5. In Paragraph 4, The plurality of second taping portions are arranged spaced apart from each other on the side portions of the battery cells.

6. In Paragraph 5, The battery cell having a plurality of second taping portions extending across the side portion to the front and rear of the storage portion.

7. In Paragraph 4, The above-mentioned side portion is a battery cell in which the portion extending outwardly from the storage portion is folded at least twice.

8. In Paragraph 2, A flame exhaust path is formed inside the battery case in a direction toward the side portion, and The above flame exhaust path is, It is formed between portions located adjacent to each other among the plurality of first taping portions and the plurality of second taping portions, and A battery cell not formed between the first taping part and the second taping part that overlap each other.

9. In Paragraph 8, A battery cell in which the width of the flame exhaust path increases as the area where the first taping part and the second taping part overlap each other increases.

10. In Paragraph 8, A battery cell in which the discharge direction of the flame discharge path is controlled according to the area where the first taping part and the second taping part overlap each other.

11. A battery pack comprising a battery cell according to paragraph 1.

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