Insulation sheet and battery pack containing same

Abstract

An insulation sheet according to one embodiment of the present invention is disposed between a first battery cell and a second battery cell, and comprises an insulation pad part and a packaging member, which encompasses the entire outer surface of the insulation pad part, wherein the packaging member includes a main body surface covering the front and rear surfaces and upper and lower surfaces of the insulation pad part and a pair of extension surfaces covering both ends of the insulation pad part, one end of each of the pair of extension surfaces is connected to the main body surface covering the rear surface of the insulation pad part, the other end of each of the pair of extension surfaces passes through both ends of the insulation pad part and extends to each of both ends of the main body surface covering the front surface of the insulation pad part, the first battery cell is disposed between the other ends of the pair of extension surfaces, and the second battery cell is disposed on the rear surface of the insulation pad part.

Description

Insulating sheet and battery pack including same

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

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0091163, filed July 10, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to an insulating sheet and a battery pack including the same, and more particularly, to an insulating sheet disposed between adjacent battery cells and a battery pack including the same, wherein a packaging member covering the outer surface of an insulating pad portion is appropriately arranged in an overlapping section so that the insulating sheet can apply uniform surface pressure to the battery cells, and to a battery pack including the same.

[0004] Secondary batteries, which boast high electrical properties such as high energy density and easy applicability across a wide range of product groups, are widely used not only in portable devices but also in electric or hybrid vehicles powered by electrical power sources, as well as in power storage devices. These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can dramatically reduce fossil fuel use, but also because they produce no byproducts from energy use.

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0006] In general, lithium secondary batteries can be classified into cylindrical or square secondary batteries in which the electrode assembly is built into a metal can, and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0007] While secondary batteries possess excellent electrical properties, they are vulnerable to abnormal operating conditions, such as overcharge, overdischarge, high-temperature exposure, and electrical short-circuiting. This decomposition, which generates heat and gas, can cause the battery to expand, a phenomenon known as swelling. This swelling accelerates the decomposition process, potentially leading to thermal runaway, which can lead to explosions and fires.

[0008] Additionally, thermal runaway occurring in some battery cells can trigger thermal propagation, which can induce thermal runaway in adjacent battery cells. To minimize or delay this thermal propagation for a predetermined period of time, insulating pads can be placed between the battery cells. Aerogel pads, which typically have the best insulating properties, can be placed between the battery cells.

[0009] However, due to the material properties of aerogel pads, while they offer excellent insulation performance, their mechanical strength is weak. Therefore, the outer surface of the aerogel pad must be covered with a separate packaging material. This overlap occurs in some areas of the aerogel. If this overlap occurs between the aerogel pad and the battery cell, the aerogel pad's surface pressure against the battery cell may become uneven.

[0010] Accordingly, there is a growing need to develop an insulating pad and a battery pack including the same that prevents the overlapping section of the packaging material formed in some areas of the aerogel from contacting the battery cell.

[0011] The problem to be solved by the present invention is to provide an insulating sheet disposed between adjacent battery cells and a battery pack including the same, wherein a section in which a packaging member covering the outer surface of an insulating pad portion overlaps is appropriately arranged so that the insulating sheet can apply uniform surface pressure to the battery cells, and a battery pack including the same.

[0012] The problems to be solved by the present invention are not limited to the problems described above, and problems not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0013] According to one embodiment of the present invention, an insulating sheet is provided between a first battery cell and a second battery cell, the insulating sheet comprising: an insulating pad portion; and a packaging member covering the entire outer surface of the insulating pad portion, wherein the packaging member comprises a main body surface covering front and rear surfaces and upper and lower surfaces of the insulating pad portion and a pair of extension surfaces covering both ends of the insulating pad portion, one end of the pair of extension surfaces being connected to the main body surface covering the rear surface of the insulating pad portion, and the other end of the pair of extension surfaces extending past both ends of the insulating pad portion to both ends of the main body surface covering the front surface of the insulating pad portion, the first battery cell being provided between the other ends of the pair of extension surfaces, and the second battery cell being provided on the rear surface of the insulating pad portion.

[0014] The packaging member disposed between the first battery cell and the insulating pad portion and between the second battery cell and the insulating pad portion may have at least two layers.

[0015] The first battery cell and the second battery cell may be arranged at the same position on the front and rear surfaces of the insulating pad portion.

[0016] The first battery cell and the second battery cell may have the same size.

[0017] The area between the other ends of the pair of extended surfaces on the front surface of the insulating pad portion may be greater than or equal to the area of ​​one surface of the first battery cell that is in contact with the front surface of the insulating pad portion.

[0018] The first battery cell and the second battery cell each include a main body having an electrode assembly built in, and an electrode tab electrically connected to the electrode assembly may be positioned at at least one end of the first battery cell and the second battery cell, respectively.

[0019] The main body of the first battery cell may be disposed between the other ends of the pair of extended surfaces, and the electrode tab of the first battery cell may extend past the other ends of the pair of extended surfaces toward both ends of the insulating pad portion.

[0020] The electrode tabs include a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab may be positioned at opposite ends of the first battery cell and the second battery cell, respectively, and are electrically connected to the electrode assembly.

[0021] The main body surface includes a first main body surface, a second main body surface, and a third main body surface that extend in the width direction of the insulating pad portion and are connected to each other, and the pair of extension surfaces extend from both ends of one of the first main body surface, the second main body surface, and the third main body surface, and the rear surface of the insulating pad portion is secured to one of the first main body surface, the second main body surface, and the third main body surface, and the remainder is folded in a direction that sequentially covers the front and rear surfaces and the upper and lower surfaces of the insulating pad portion, and the pair of extension surfaces can be folded in a direction that covers both ends of the insulating pad portion.

[0022] The rear surface of the above insulating pad portion is secured to the second main body surface, and the first main body surface and the third main body surface can be folded in a direction that sequentially covers the front and rear surfaces of the above insulating pad portion.

[0023] The rear surface of the insulating pad portion is secured to the second main body surface, the first main body surface is folded in a direction covering the front surface of the insulating pad portion, and in a state where the first main body surface covers the front surface of the insulating pad portion, the first main body surface is folded in a direction toward the third main body surface, and the pair of extension surfaces extend from both ends of the third main body surface and can cover both ends of the second main body surface.

[0024] The above insulating pad portion may be made of an aerogel pad, and the packaging material may include a PET film.

[0025] The above packaging material may have a flame retardant material coated on the upper and lower surfaces of the PET film, and a flame retardant adhesive may be applied to a surface of the upper and lower surfaces of the PET film that covers the insulating pad portion.

[0026] According to another embodiment of the present invention, a battery pack includes the above-described insulating sheet, and may include a plurality of battery cells; and at least one insulating sheet disposed between a pair of battery cells positioned adjacent to each other among the plurality of battery cells.

[0027] According to embodiments, the present invention provides an insulating sheet disposed between adjacent battery cells and a battery pack including the same, wherein a packaging member covering an outer surface of an insulating pad portion is appropriately arranged in an overlapping section so that the insulating sheet can apply uniform surface pressure to the battery cells.

[0028] In particular, the present invention does not provide an overlapping section for the portion where the packaging material covering the outer surface of the insulating pad portion comes into contact with the battery cell, so that the insulating sheet can apply more uniform surface pressure to the battery cell.

[0029] In addition, in the insulating sheet of the present invention, the size of the portion excluding the overlapping section of the packaging member for the insulating pad portion is equal to or larger than the size of the battery cell, so that the insulating sheet can apply more uniform surface pressure to the battery cell.

[0030] The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0031] FIG. 1 is a perspective view showing an insulating sheet disposed between a pair of adjacent battery cells according to one embodiment of the present invention.

[0032] FIG. 2 is an exploded perspective view showing a pair of adjacent battery cells and an insulating sheet according to FIG. 1.

[0033] FIG. 3 is a cross-sectional view taken along the a-a' axis of an insulating sheet disposed between a pair of adjacent battery cells according to FIG. 1.

[0034] Fig. 4 is a perspective view showing the insulating member of Fig. 1.

[0035] Figures 5 to 8 are drawings showing a form in which a packaging member covers an insulating sheet portion included in the insulating member of Figure 1.

[0036] Figure 9 is a cross-sectional view taken along the b-b' axis of Figure 4.

[0037] 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 invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0038] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0039] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0040] Additionally, throughout the specification, whenever a part is said to “include” a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0041] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0042] FIG. 1 is a perspective view illustrating an insulating sheet disposed between a pair of adjacent battery cells according to one embodiment of the present invention. FIG. 2 is an exploded perspective view illustrating a pair of adjacent battery cells and an insulating sheet according to FIG. 1. FIG. 3 is a cross-sectional view taken along the a-a' axis of an insulating sheet disposed between a pair of adjacent battery cells according to FIG. 1. FIG. 4 is a perspective view illustrating the insulating member of FIG. 1.

[0043] Referring to FIGS. 1 to 3, an insulating sheet (100) according to one embodiment of the present invention can be placed between a first battery cell (200a) and a second battery cell (200b).

[0044] Here, the first battery cell (200a) and the second battery cell (200b) each include a main body (210a, 210b) in which an electrode assembly (not shown) is built-in, and an electrode tab (250a, 250b) electrically connected to the electrode assembly (not shown) may be positioned at at least one end of the first battery cell (200a) and the second battery cell (200b), respectively.

[0045] For example, the first battery cell (200a) and the second battery cell (200b) may be pouch-type battery cells as shown in FIGS. 1 to 3. More specifically, the first main body (210a) of the first battery cell (200a) may be manufactured by housing an electrode assembly (not shown) in a pouch case of a laminate sheet and then heat-sealing the sealing portion of the pouch case. In addition, in the first battery cell (200a), a first electrode tab (250a) may protrude outward from at least one end of the pouch case. However, the shape of the first battery cell (200a) is not limited thereto, and battery cells having shapes such as a square shape and a cylindrical shape may also be included in the present embodiment. The same can be described for the second main body (210b) and the second electrode tab (250b) of the second battery cell (200b).

[0046] As shown in FIGS. 1 to 3, first electrode tabs (250a) may protrude outward at each end of the first battery cell (200a). However, this is not limited thereto, and a case in which one or more electrode tabs (250a) are positioned at one end of the first battery cell (200a) may also be included in the present embodiment. This can be explained in the same way for the second electrode tabs (250b) of the second battery cell (200b).

[0047] As shown in FIGS. 1 to 3, an insulating sheet (100) may be placed between a plurality of battery cells (200a, 200b) that are stacked so as to be electrically connected to each other, and the insulating sheets (100) may be placed between adjacent battery cells (200a, 200b) or at predetermined intervals. In this way, the number of insulating sheets (100) may be adjusted as needed.

[0048] Accordingly, the insulating sheet (100) according to the present embodiment can effectively block heat transfer between battery cells (200a, 200b) while applying sufficient surface pressure to the battery cells (200a, 200b).

[0049] Referring to FIG. 3, the insulating sheet (100) according to the present embodiment includes an insulating pad portion (120); and a packaging member (110) that wraps the entire outer surface of the insulating pad portion (120).

[0050] More specifically, the insulation pad portion (120) may be made of a flame-retardant material having a grade of V-0 or higher based on the plastic flame-retardant standard (UL94), or a grade of V-0 or 5V. For example, the insulation pad portion (120) may be made of an aerogel pad.

[0051] For example, the packaging member (110) may include a PET film. More specifically, the packaging member (110) may have a flame-retardant material coated on the upper and lower surfaces of the PET film, and a flame-retardant adhesive may be applied to a surface of the PET film that covers the insulating pad portion. Here, the flame-retardant adhesive may be a silicone-based adhesive, and may be a double-sided tape or a spray-type adhesive.

[0052] Accordingly, the insulating sheet (100) according to the present embodiment has an advantage in that the packaging member (110) made of a PET film coated with a flame-retardant material wraps the entire outer surface of the insulating pad portion (120), so that the packaging member (110) can sufficiently secure the flame retardancy of the insulating pad portion (120) while supplementing the rigidity of the insulating pad portion (120) in a high-temperature environment.

[0053] Referring to FIGS. 3 and 4, the packaging member (110) includes a main body surface (110a) covering both sides and the upper and lower surfaces of the insulating pad portion (120) and a pair of extension surfaces (110b) covering both ends of the insulating pad portion (120).

[0054] More specifically, in the packaging member (110), one end of a pair of extension surfaces (110b) may be connected to the rear surface of the insulating pad portion (120) and the main body surface (110a). In other words, in the packaging member (110), the pair of extension surfaces (110b) and the main body surface (110a) may be configured to be integrated with each other.

[0055] In addition, as shown in FIGS. 3 and 4, the other ends of the pair of extension surfaces (110b) may extend past both ends of the insulating pad portion (120) to both ends of the main body surface (110a) that covers the front surface of the insulating pad portion (120). That is, the pair of extension surfaces (110b) may cover the entire area between the insulating pad portion (120) and the main body surface (110a) along with both ends of the insulating pad portion (120).

[0056] Accordingly, the insulation sheet (100) according to the present embodiment can effectively supplement the mechanical rigidity of the insulation pad portion (120) by covering the entire outer surface of the insulation pad portion (120) with the packaging material (110) without the insulation pad portion (120) being exposed to the outside.

[0057] In addition, in the packaging member (110), since a pair of extension surfaces (110b) cover both ends of the main body surface (110a) without additional overlapping sections, the assembly and productivity of the insulating sheet (100) can be further improved, and a thickness deviation can not occur in the portion where the pair of extension surfaces (110b) are located.

[0058] In addition, referring to FIGS. 1, 3, and 4, in the insulating sheet (100) according to the present embodiment, the first battery cell (200a) may be arranged on the front side of the insulating sheet (100), while the second battery cell (200b) may be arranged on the back side of the insulating sheet (100). In particular, the first battery cell (200a) may be arranged between the other ends of a pair of extension surfaces (110b).

[0059] Here, the first battery cell (200a) and the second battery cell (200b) may be arranged at the same positions on the front and rear surfaces of the insulation pad portion (120), respectively. For example, the first battery cell (200a) and the second battery cell (200b) may have the same size. As another example, the first battery cell (200a) and the second battery cell (200b) may be the same battery cells.

[0060] The area between the other ends of a pair of extension surfaces (110b) on the front surface of the insulating pad portion (120) may be greater than or equal to the area of ​​one side of the first battery cell (200a) that is in contact with the front surface of the insulating pad portion (120). For example, as shown in FIGS. 3 and 4, the distance (d1) between the other ends of a pair of extension surfaces (110b) may be greater than or equal to the length (d2) of the first battery cell (200a).

[0061] Referring to FIG. 3, the packaging member (110) disposed between the first battery cell (200a) and the insulating pad portion (120) and between the second battery cell (200b) and the insulating pad portion (120) may have at least two layers. In other words, only the main body surface (110a) of the packaging member (110) may be disposed between the first battery cell (200a) and the insulating pad portion (120) and between the second battery cell (200b) and the insulating pad portion (120), and the extension surface (110b) of the packaging member (110) may not be disposed.

[0062] Accordingly, in the insulating sheet (100) according to the present embodiment, the packaging member (110) disposed between the battery cells (200a, 200b) and the insulating pad portion (120) is minimized, and the thickness of the packaging member (110) disposed between the battery cells (200a, 200b) and the insulating pad portion (120) is constant, so that the insulating sheet (100) can apply a uniform surface pressure to the battery cells (200a, 200b).

[0063] In particular, in the insulating sheet (100) according to the present embodiment, since a pair of extension surfaces (110b) for covering both ends of the insulating pad portion (120) are finished at a portion avoiding the space between the battery cells (200a, 200b) and the insulating pad portion (120), the influence of the thickness deviation of the insulating sheet (100) due to the packaging member (110) on the provision of surface pressure between the insulating sheet (100) and the battery cell (200) can be minimized.

[0064] For example, as shown in FIGS. 1 to 3, in the insulating sheet (100) according to the present embodiment, the first main body (210a) of the first battery cell (200a) may be disposed between the other ends of a pair of extension surfaces (110b), and the first electrode tab (250a) of the first battery cell (200a) may extend past the other ends of the pair of extension surfaces (110b) toward both ends of the insulating pad portion (120). In addition, the second main body (210b) of the second battery cell (200b) may be disposed on the rear surface of the insulating sheet portion (120), and the second electrode tab (250b) of the second battery cell (200b) may extend toward both ends of the insulating pad portion (120).

[0065] Accordingly, in the insulating sheet (100) according to the present embodiment, since the insulating sheet portion (120) and a pair of extension surfaces (110b) are arranged between the first electrode tab (250a) of the first battery cell (200a) and the second electrode tab (250b) of the second battery cell (200b), insulating performance can be additionally secured between the first electrode tab (250a) of the first battery cell (200a) and the second electrode tab (250b) of the second battery cell (200b).

[0066] Figures 5 to 8 are drawings showing a form in which a packaging member covers an insulating sheet portion included in the insulating member of Figure 1. Figure 9 is a cross-sectional view taken along the b-b' axis of Figure 4.

[0067] Referring to FIG. 5, in the insulating sheet (100) according to the present embodiment, the main body surface (110a) may include a first main body surface (111a), a second main body surface (113a), and a third main body surface (115a) that extend in the width direction of the insulating pad portion (120) and are connected to each other. More specifically, as shown in FIG. 5, a first main body connection surface (112a) may be positioned between the first main body surface (111a) and the second main body surface (113a), and a second main body connection surface (114a) may be positioned between the second main body surface (113a) and the third main body surface (115a). In other words, in the main body surface (110a) of the packaging member (110), the first main body surface (111a), the first main body connection surface (112a), the second main body surface (113a), the second main body connection surface (114a), and the third main body surface (115a) may be configured to be integrated with each other.

[0068] Here, the first main body surface (111a), the second main body surface (113a), and the third main body surface (115a) cover the front and rear surfaces of the insulation sheet portion (120), respectively, and the first main body connection surface (112a) and the second main body connection surface (114a) can cover the upper and lower surfaces of the insulation sheet portion (120), respectively.

[0069] The front surface of the insulation pad portion (120) is secured to one of the first main body surface (111a), the second main body surface (113a), and the third main body surface (115a), and the remaining surfaces can be folded in a direction that sequentially covers the front and rear surfaces and the upper and lower surfaces of the insulation pad portion (120).

[0070] For example, as shown in Fig. 5, the front surface of the insulating pad portion (120) can be placed on the second main body surface (113a). Thereafter, the first main body surface (111a) and the third main body surface (115a) can be folded in a direction to sequentially cover the front and back surfaces of the insulating pad portion (120), respectively.

[0071] For example, as shown in FIG. 6, the first main body surface (111a) may be folded in a direction that covers the rear surface of the insulating pad portion (120) with respect to the insulating pad portion (120) mounted on the second main body surface (113a). At this time, the upper surface of the insulating pad portion (120) may be covered by the first main body connection surface (112a). Thereafter, as shown in FIG. 7, the first main body surface (111a) may be folded in a direction toward the third main body surface (115a) while covering the front surface of the insulating pad portion (120).

[0072] Here, a pair of extension surfaces (110b) may extend from both ends of one of the first main body surface (111a), the second main body surface (113a), and the third main body surface (115a). At this time, the pair of extension surfaces (110b) may be folded in a direction that covers both ends of the insulating pad portion (120). For example, as shown in FIGS. 5 to 7, the pair of extension surfaces (110b) may extend from both ends of the third main body surface (115a).

[0073] More specifically, as shown in FIGS. 5 to 7, each of the pair of extension surfaces (110b) includes an extension connection surface (111b) connected to the third main body surface (115a) and an extension cover surface (112b) covering the second main body surface (113a). In other words, in the pair of extension surfaces (110b) of the packaging member (110), the third main body surface (115a), the extension connection surface (111b), and the extension cover surface (112b) may be configured as an integrated unit.

[0074] After the front and rear surfaces and the upper and lower surfaces of the insulation pad portion (120) are covered by the main body surface (110a) as shown in FIGS. 5 to 7, the other end of a pair of extension surfaces (110b) can cover both ends of the second main body surface (113a) as shown in FIGS. 8 and 9.

[0075] Accordingly, the insulating sheet (100) according to the present embodiment can be covered with the packaging material (110) without the entire outer surface of the insulating pad portion (120) being exposed to the outside, thereby effectively supplementing the mechanical rigidity of the insulating pad portion (120). In addition, as shown in FIG. 9, the shape of the packaging material (110) covering the insulating sheet portion (120) minimizes the overlapping section on the insulating sheet portion (120), while the folding structure of the packaging material (110) is simplified, thereby further improving the assembly and productivity of the insulating sheet (100).

[0076] According to another embodiment of the present invention, a battery pack comprises the above-described insulating sheet (100), a plurality of battery cells, and at least one insulating sheet (100) disposed between a pair of battery cells (200a, 200b) positioned adjacent to each other among the plurality of battery cells.

[0077] Accordingly, in the battery pack according to the present embodiment, an insulating sheet (100) placed between a pair of battery cells (200a, 200b) positioned adjacent to each other provides a uniform surface pressure to the battery cells (200a, 200b), thereby more effectively minimizing or delaying the heat transfer phenomenon between the battery cells for a predetermined period of time.

[0078] The battery module and battery pack containing it described above can be applied to various devices. These devices include, but are not limited to, means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles. However, the present invention is not limited thereto and can be applied to various devices that can utilize the battery module and battery pack containing it, and this also falls within the scope of the present invention.

[0079] Although the 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 made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0080] [Explanation of symbols]

[0081] 100: Insulating sheet

[0082] 110: Packaging material

[0083] 110a: Main body

[0084] 111a: First main body surface

[0085] 112a: First main body connection surface

[0086] 113a: Second main body surface

[0087] 114a: Second main body connection surface

[0088] 115a: Third main body surface

[0089] 110b: Extension

[0090] 111b: Extension connection surface

[0091] 112b: Extended cover surface

[0092] 120: Insulating pad section

[0093] 200a: 1st battery cell

[0094] 200b: Second battery cell

Claims

1. An insulating sheet placed between the first battery cell and the second battery cell, Insulating pad section; and Including a packaging material that wraps the entire outer surface of the above insulating pad portion, The above packaging member includes a main body surface covering the front and rear surfaces and the upper and lower surfaces of the insulating pad portion and a pair of extension surfaces covering both ends of the insulating pad portion. One end of the above pair of extension surfaces is connected to the body surface covering the rear surface of the above insulating pad, The other end of the pair of extension surfaces extends past both ends of the insulating pad portion to both ends of the main body surface covering the front surface of the insulating pad portion, respectively. An insulating sheet in which the first battery cell is disposed between the other ends of the pair of extended surfaces, and the second battery cell is disposed on the rear side of the insulating pad portion.

2. In paragraph 1, An insulating sheet in which the packaging member disposed between the first battery cell and the insulating pad portion and between the second battery cell and the insulating pad portion are at least two layers.

3. In paragraph 1, An insulating sheet in which the first battery cell and the second battery cell are respectively arranged at the same position on the front and rear surfaces of the insulating pad portion.

4. In paragraph 3, The first battery cell and the second battery cell are insulating sheets having the same size.

5. In paragraph 1, An insulating sheet in which the area between the other ends of the pair of extended surfaces on the front surface of the insulating pad portion is greater than or equal to the area of ​​one surface of the first battery cell in contact with the front surface of the insulating pad portion.

6. In paragraph 1, The first battery cell and the second battery cell each include a main body having an electrode assembly built in, An insulating sheet having electrode tabs electrically connected to the electrode assembly at at least one end of each of the first battery cell and the second battery cell.

7. In paragraph 6, The main body of the first battery cell is placed between the other ends of the pair of extension surfaces, An insulating sheet in which the electrode tab of the first battery cell extends past the other end of the pair of extended surfaces toward both ends of the insulating pad portion.

8. In paragraph 6, The above electrode tab includes a positive tab and a negative tab, An insulating sheet having the positive electrode tab and the negative electrode tab electrically connected to the electrode assembly at each end of the first battery cell and the second battery cell, respectively.

9. In paragraph 1, The above body surface includes a first body surface, a second body surface, and a third body surface that extend in the width direction of the insulating pad portion and are connected to each other, The above pair of extension surfaces extend from both ends of one of the first body surface, the second body surface, and the third body surface, The front surface of the above insulating pad portion is fixed on one of the first body surface, the second body surface, and the third body surface, and the remaining parts are folded in a direction that sequentially covers the front and rear surfaces and the upper and lower surfaces of the above insulating pad portion. The above pair of extension surfaces are insulating sheets folded in a direction that covers both ends of the insulating pad portion.

10. In paragraph 9, An insulating sheet in which the front surface of the insulating pad portion is fixed to the second main body surface, and the first main body surface and the third main body surface are folded in a direction that sequentially covers the front and back surfaces of the insulating pad portion, respectively.

11. In paragraph 10, The front surface of the above insulating pad portion is fixed to the second main body surface, and the first main body surface is folded in a direction covering the rear surface of the above insulating pad portion. In a state where the first main body surface covers the rear surface of the insulating pad portion, the first main body surface is folded in a direction toward the third main body surface, The above pair of extension surfaces extend from both ends of the third main body surface and are insulating sheets that cover both ends of the second main body surface.

12. In paragraph 1, The above insulating pad portion is made of an aerogel pad, The above packaging material is an insulating sheet including a PET film.

13. In paragraph 12, The above packaging material has a flame retardant material coated on the upper and lower surfaces of the PET film, An insulating sheet having a flame retardant adhesive applied to the surface covering the insulating pad portion among the upper and lower surfaces of the PET film.

14. A battery pack including an insulating sheet according to paragraph 1, multiple battery cells; and A battery pack comprising at least one insulating sheet disposed between a pair of battery cells positioned adjacent to each other among the plurality of battery cells.

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