Thermal insulation sheet and battery pack comprising the same

Abstract

The thermal insulation sheet according to one embodiment of the present application is disposed between a first battery cell and a second battery cell, and includes a thermal insulation pad portion, and a packaging member wrapping an entire outer surface of the thermal insulation pad portion, wherein the packaging member includes a main body surface covering front and rear surfaces and upper and lower surfaces of the thermal insulation pad portion, and a pair of extension surfaces covering both ends of the thermal insulation pad portion, one end of each of the pair of extension surfaces is connected to the main body surface covering the rear surface of the thermal insulation pad portion, the other end of each of the pair of extension surfaces passes through the both ends of the thermal insulation pad portion and extends to each of both ends of the main body surface covering the front surface of the thermal insulation pad portion, respectively, 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 thermal insulation pad portion.

Description

Technical Field

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0091163, filed on July 10, 2024, the disclosure of which is incorporated herein by reference in its entirety.

[0003] This disclosure relates to a heat insulation sheet and a battery pack containing the heat insulation sheet, and more specifically, to a heat insulation sheet disposed between adjacent battery cells and a battery pack containing the heat insulation sheet, wherein the heat insulation sheet may be suitably configured to have overlapping areas of encapsulation material covering the outer surface of the heat insulation pad portion, thereby allowing the heat insulation sheet to apply uniform surface pressure to the battery cells. Background Technology

[0004] Secondary batteries, highly adaptable to a wide range of products and exhibiting excellent electrical properties such as high energy density, are commonly used not only in portable devices but also in electric or hybrid vehicles powered by these batteries. Because of their major advantage of significantly reducing fossil fuel consumption and the absence of byproducts from energy use, secondary batteries have attracted considerable attention as a novel energy source for enhancing environmental friendliness and energy efficiency.

[0005] Currently, commercially available rechargeable batteries include nickel-cadmium (NiCd), nickel-metal hydride (NiMH), nickel-zinc (NiZn), and lithium-ion batteries. Among these, lithium-ion batteries are becoming the most popular because they do not suffer from the memory effect compared to nickel-based batteries, allowing for free charging / discharging, exhibiting a low self-discharge rate, and possessing high energy density.

[0006] Generally, lithium secondary batteries can be classified according to the shape of their casing into cylindrical or square secondary batteries, which are manufactured by mounting the electrode assembly in a metal can, and pouch-shaped secondary batteries, which are manufactured by mounting the electrode assembly in a bag made of aluminum laminate.

[0007] Furthermore, although secondary batteries possess excellent electrical properties, components such as active materials or electrolytes can undergo decomposition reactions under abnormal operating conditions such as overcharging, over-discharging, exposure to high temperatures, or short circuits, thereby generating heat and gases. As a result, a problem arises where the secondary battery expands, a phenomenon known as bulging. Bulging accelerates the decomposition reaction, which can also lead to thermal runaway and potentially cause the secondary battery to explode or catch fire.

[0008] Furthermore, thermal runaway occurring in some battery cells can lead to heat propagation that causes thermal runaway in other adjacent battery cells. To minimize or delay this heat propagation for a predetermined period, insulating pads can be placed between the battery cells. Aerogel pads, which typically offer optimal thermal insulation, are often used in this case.

[0009] However, while aerogel pads offer excellent thermal insulation due to their material properties, they suffer from poor mechanical strength. In this regard, the outer surface of the aerogel pad needs to be covered with a separate encapsulation material. This results in overlapping sections of encapsulation material in some areas of the aerogel, and if these overlapping sections come into contact with the battery cell, uneven surface pressure from the aerogel pad to the battery cell may occur.

[0010] Therefore, there is an increasing need to develop a heat-insulating pad and a battery pack that includes the heat-insulating pad to prevent overlapping sections of the encapsulation material formed in a portion of the aerogel from contacting the battery cell. Summary of the Invention

[0011] Technical issues

[0012] The purpose of this disclosure is to provide a heat insulation sheet disposed between adjacent battery cells and a battery pack containing the heat insulation sheet, wherein the heat insulation sheet may be appropriately provided with overlapping sections of encapsulation material covering the outer surface of the heat insulation pad portion, thereby allowing the heat insulation sheet to apply uniform surface pressure to the battery cells.

[0013] The purpose of this disclosure is not limited to the above-described purposes, and other purposes not described herein should be clearly understood by those skilled in the art based on the following detailed description and accompanying drawings.

[0014] Technical solution

[0015] According to one aspect of this disclosure, a heat insulation sheet is provided disposed between a first battery cell and a second battery cell. The heat insulation sheet includes: a heat insulation pad portion; and an encapsulation member that covers the entire outer surface of the heat insulation pad portion. The encapsulation member includes a main surface and a pair of extending surfaces. The main surface covers the front and rear surfaces, as well as the upper and lower surfaces of the heat insulation pad portion. The pair of extending surfaces covers both ends of the heat insulation pad portion. One end of the pair of extending surfaces is connected to the main surface covering the rear surface of the heat insulation pad portion. The other end of the pair of extending surfaces passes through both ends of the heat insulation pad portion and extends to both ends of the main surface covering the front surface of the heat insulation pad portion. The first battery cell is disposed between the other ends of the pair of extending surfaces, and the second battery cell is disposed on the rear surface of the heat insulation pad portion.

[0016] The encapsulation components disposed between the first battery cell and the heat insulation pad and between the second battery cell and the heat insulation pad may include at least two layers or fewer layers.

[0017] The first and second battery cells can be positioned at the same location on the front and rear surfaces of the heat insulation pad, respectively.

[0018] The first and second battery cells can have the same size as each other.

[0019] The area between the other ends of a pair of extended surfaces on the front surface of the heat insulation pad can be greater than or equal to the area of ​​one surface of the first battery cell that contacts the front surface of the heat insulation pad.

[0020] The first battery cell and the second battery cell each include a main body portion, in which an electrode assembly is built-in, and electrode tabs electrically connected to the electrode assembly can be located at at least one end of the first battery cell and the second battery cell, respectively.

[0021] The main body of the first battery cell is disposed between the other ends of a pair of extended surfaces, and the electrode tabs of the first battery cell can extend through the other ends of the pair of extended surfaces toward both ends of the heat insulation pad.

[0022] The electrode tabs include a positive tab and a negative tab, and the positive tab and negative tab, which are electrically connected to the electrode assembly, can be located at the two ends of the first battery cell and the second battery cell, respectively.

[0023] 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 heat insulation pad and are connected to each other. A pair of extending surfaces extend from both ends of one of the first main body surface, the second main body surface, and the third main body surface. The front surface of the heat insulation pad is disposed on one of the first main body surface, the second main body surface, and the third main body surface. The remaining main body surfaces are folded in a direction that sequentially covers the front and rear surfaces, as well as the upper and lower surfaces of the heat insulation pad. The pair of extending surfaces can be folded in a direction that covers both ends of the heat insulation pad.

[0024] The front surface of the heat insulation pad can be placed on the second main body surface, and the first main body surface and the third main body surface can be folded sequentially in the direction of covering the front and rear surfaces of the heat insulation pad, respectively.

[0025] The front surface of the heat insulation pad is placed on the second main body surface, and the first main body surface is folded in the direction covering the rear surface of the heat insulation pad. With the first main body surface covering the rear surface of the heat insulation pad, the first main body surface is folded in the direction toward the third main body surface, and a pair of extended surfaces can extend from both ends of the third main body surface and cover both ends of the second main body surface.

[0026] The heat insulation pad is made of aerogel pad, and the encapsulation component may include a PET film.

[0027] The encapsulation component can be coated with flame-retardant material on the upper and lower surfaces of the PET film, and flame-retardant adhesive can be applied to the surface of the upper and lower surfaces of the PET film covering the heat insulation pad.

[0028] According to another aspect of this disclosure, a battery pack including the aforementioned heat insulation sheet is provided, wherein the battery pack may include a plurality of battery cells; and at least one heat insulation sheet disposed between a pair of battery cells positioned adjacent to each other among the plurality of battery cells.

[0029] Beneficial effects

[0030] According to a specific embodiment, this disclosure provides a heat insulation sheet and a battery pack including the heat insulation sheet. The heat insulation sheet may be appropriately provided with overlapping sections of encapsulation material covering the outer surface of the heat insulation pad portion, thereby allowing the heat insulation sheet to apply uniform surface pressure to the battery cell.

[0031] In particular, this disclosure is configured such that there are no overlapping sections in the portion of the encapsulation member that contacts the battery cell on the outer surface of the heat insulation pad, thereby allowing the heat insulation sheet to apply more uniform surface pressure to the battery cell.

[0032] In addition, in the heat insulation sheet disclosed herein, the size of the portion other than the overlapping section of the encapsulation member for the heat insulation pad is equal to or greater than the size of the battery cell, thereby allowing the heat insulation sheet to apply more uniform surface pressure to the battery cell.

[0033] The effects of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the detailed description and accompanying drawings any additional effects not described above. Attached Figure Description

[0034] Figure 1 This is a perspective view illustrating a heat insulation sheet disposed between a pair of adjacent battery cells according to one embodiment of the present disclosure.

[0035] Figure 2 This is an example based on Figure 1 An exploded perspective view of a pair of adjacent battery cells and a heat shield.

[0036] Figure 3 It is set along the a-a' axis according to Figure 1 A cross-sectional view of the heat insulation sheet between a pair of adjacent battery cells.

[0037] Figure 4 This is an example Figure 1A three-dimensional view of the thermal insulation component.

[0038] Figures 5 to 8 Examples include Figure 1 A diagram showing the shape in which the heat insulation sheet in the heat insulation component is covered by the encapsulation component.

[0039] Figure 9 It is along Figure 4 A cross-sectional view taken along the b-b' axis. Detailed Implementation

[0040] In the following, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement them. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0041] For clarity in describing this disclosure, descriptions of parts unrelated to this disclosure will be omitted, and identical or similar parts will be indicated by the same reference numerals throughout the description.

[0042] For ease of description, the dimensions and thicknesses of each component are arbitrarily illustrated in the accompanying drawings; therefore, this disclosure is not necessarily limited to the illustrated dimensions and thicknesses. The drawings depict thicknesses at an enlarged scale to clearly show the different layers and regions. Furthermore, the drawings enlarge the thickness of a particular layer or region for ease of description.

[0043] Throughout this description, when a part “includes” a component, it does not indicate that the part excludes other components, but rather that the part may include other components, unless otherwise defined.

[0044] Throughout this description, the term "in a plan view" refers to an object viewed from above, and the term "in a cross-sectional view" refers to a vertical cross-section of an object viewed from the side.

[0045] Figure 1 This is a perspective view illustrating a heat insulation sheet disposed between a pair of adjacent battery cells according to one embodiment of the present disclosure. Figure 2 This is an example based on Figure 1 An exploded perspective view of a pair of adjacent battery cells and a heat shield. Figure 3 It is set along the a-a' axis according to Figure 1 A cross-sectional view of the heat insulation sheet between a pair of adjacent battery cells. Figure 4 This is an example Figure 1 A three-dimensional view of the thermal insulation component.

[0046] Reference Figures 1 to 3 According to one embodiment of the present disclosure, the heat insulation sheet 100 can be disposed between the first battery cell 200a and the second battery cell 200b.

[0047] Here, the first battery cell 200a and the second battery cell 200b each include a main body portion 210a, 210b in which an electrode assembly (not shown) is built-in, and electrode tabs 250a, 250b electrically connected to the electrode assembly (not shown) can be located at at least one end of the first battery cell 200a and the second battery cell 200b, respectively.

[0048] As an example, the first battery cell 200a and the second battery cell 200b can be as follows: Figures 1 to 3 The pouch-type battery cell shown. More specifically, the first body portion 210a of the first battery cell 200a can be manufactured by housing an electrode assembly (not shown) in a pouch-shaped housing of a laminate, and then thermally welding the sealing portion of the pouch-shaped housing. Additionally, in the first battery cell 200a, a first electrode tab 250a can protrude outward from at least one end of the pouch-shaped housing. However, the shape of the first battery cell 200a is not limited to this, and battery cells having shapes such as square or cylindrical can also be included in this embodiment. This can also be explained similarly for the second body portion 210b and the second electrode tab 250b of the second battery cell 200b.

[0049] like Figures 1 to 3 As shown, the first electrode tabs 250a may protrude outwards at both ends of the first battery cell 200a. However, this embodiment is not limited to this, and may also include cases where one or more electrode tabs 250a are located at one end of the first battery cell 200a. This can also be explained similarly for the second electrode tabs 250b of the second battery cell 200b.

[0050] like Figures 1 to 3 As shown, the heat insulation sheet 100 can be disposed between multiple battery cells 200a, 200b stacked together for electrical connection with each other, and the heat insulation sheet 100 can be disposed between adjacent battery cells 200a, 200b or at predetermined intervals. In this way, the number of heat insulation sheets 100 can be adjusted as needed.

[0051] Therefore, the heat insulation sheet 100 according to this embodiment can effectively block heat transfer between the battery cells 200a and 200b while applying sufficient surface pressure to the battery cells 200a and 200b.

[0052] Reference Figure 3 The heat insulation sheet 100 according to this embodiment includes a heat insulation pad portion 120 and an encapsulation member 110 that covers the entire outer surface of the heat insulation pad portion 120.

[0053] More specifically, the heat insulation pad portion 120 may be made of a flame-retardant material having a rating of V-0 or higher, particularly V-0 or 5V, based on the UL 94 flammability standard for plastics. As an example, the heat insulation pad portion 120 may be made of an aerogel pad.

[0054] As an example, the encapsulation member 110 may include a PET film. More specifically, the encapsulation member 110 may be coated with a flame-retardant material on the upper and lower surfaces of the PET film, and a flame-retardant adhesive may be applied to the surfaces of the upper and lower surfaces of the PET film covering the heat-insulating pad portion. Here, the flame-retardant adhesive may be a silicone-based adhesive, and may be a double-sided tape or a spray-on adhesive.

[0055] Therefore, the advantage of the heat insulation sheet 100 according to this embodiment is that the encapsulation member 110, which is made of a PET film coated with flame retardant material, covers the entire outer surface of the heat insulation pad portion 120. Thus, the encapsulation member 110 not only supplements the rigidity of the heat insulation pad portion 120 in a high-temperature environment, but also fully ensures the flame retardancy of the heat insulation pad portion 120.

[0056] Reference Figure 3 and Figure 4 The encapsulation component 110 includes a main surface 110a and a pair of extended surfaces 110b. The main surface 110a covers the two surfaces of the heat insulation pad portion 120, as well as the upper and lower surfaces, and the pair of extended surfaces 110b covers the two ends of the heat insulation pad portion 120.

[0057] More specifically, in the encapsulation member 110, one end of a pair of extended surfaces 110b can be formed to connect the rear surface of the heat insulation pad portion 120 to the body surface 110a. In other words, in the encapsulation member 110, the pair of extended surfaces 110b and the body surface 110a can be configured to be integral with each other.

[0058] In addition, such as Figure 3 and Figure 4 As shown, the other end of a pair of extended surfaces 110b can pass through both ends of the heat insulation pad portion 120 and extend to both ends of the front surface of the main body surface 110a covering the heat insulation pad portion 120. That is, the pair of extended surfaces 110b can cover the entire area between the heat insulation pad portion 120 and the main body surface 110a together with the two ends of the heat insulation pad portion 120.

[0059] Therefore, since the entire outer surface of the heat insulation pad 120 can be covered by the encapsulation member 110 while the heat insulation pad 120 is not exposed to the outside, the heat insulation sheet 100 according to this embodiment can effectively supplement the mechanical rigidity of the heat insulation pad 120.

[0060] In addition, in the encapsulation component 110, a pair of extended surfaces 110b cover both ends of the main body surface 110a without any overlapping sections that may occur further, thereby further improving the assembly properties and productivity of the heat insulation sheet 100, and preventing thickness deviations in the portion where the pair of extended surfaces 110b are located.

[0061] In addition, refer to Figure 1 , Figure 3 and Figure 4 In the heat insulation sheet 100 according to this embodiment, a first battery cell 200a may be disposed on the front surface of the heat insulation sheet 100, and a second battery cell 200b may be disposed on the rear surface of the heat insulation sheet 100. Specifically, the first battery cell 200a may be disposed between the other ends of a pair of extending surfaces 110b.

[0062] Here, the first battery cell 200a and the second battery cell 200b can be disposed at the same positions on the front and rear surfaces of the heat insulation pad portion 120, respectively. As an example, the first battery cell 200a and the second battery cell 200b can have the same dimensions. As another example, the first battery cell 200a and the second battery cell 200b can be identical battery cells.

[0063] The area between the other ends of a pair of extended surfaces 110b on the front surface of the heat insulation pad 120 can be greater than or equal to the area of ​​one surface of the first battery cell 200a that contacts the front surface of the heat insulation pad 120. For example, as Figure 3 and Figure 4 As shown, the distance d1 between the other ends of a pair of extended surfaces 110b can be greater than or equal to the length d2 of the first battery cell 200a.

[0064] Reference Figure 3 The encapsulation member 110, which is disposed between the first battery cell 200a and the heat insulation pad portion 120 and between the second battery cell 200b and the heat insulation pad portion 120, may include at least two or fewer layers. In other words, only the main body surface 110a of the encapsulation member 110 may be disposed between the first battery cell 200a and the heat insulation pad portion 120 and between the second battery cell 200b and the heat insulation pad portion 120, and the extended surface 110b of the encapsulation member 110 may not be disposed.

[0065] Therefore, in the heat insulation sheet 100 according to this embodiment, the encapsulation member 110 disposed between the battery cells 200a, 200b and the heat insulation pad portion 120 is minimized, and the thickness of the encapsulation member 110 disposed between the battery cells 200a, 200b and the heat insulation pad portion 120 is also constant, thereby allowing the heat insulation sheet 100 to apply uniform surface pressure to the battery cells 200a, 200b.

[0066] In particular, in the heat insulation sheet 100 according to this embodiment, a pair of extended surfaces 110b for covering both ends of the heat insulation pad portion 120 are completed at a portion that avoids the battery cells 200a, 200b and the heat insulation pad portion 120, thereby minimizing the effect of the thickness deviation of the heat insulation sheet 100 caused by the encapsulation member 110 on the surface pressure provided between the heat insulation sheet 100 and the battery cell 200.

[0067] As an example, such as Figures 1 to 3 As shown, the heat insulation sheet 100 according to this embodiment can be configured such that the first main body portion 210a of the first battery cell 200a is disposed between the other ends of a pair of extending surfaces 110b, and the first electrode tab 250a of the first battery cell 200a extends past the other ends of the pair of extending surfaces 110b toward both ends of the heat insulation pad portion 120. Furthermore, the second main body portion 210b of the second battery cell 200b can be disposed on the rear surface of the heat insulation sheet portion 120, and the second electrode tab 250b of the second battery cell 200b can extend toward both ends of the heat insulation pad portion 120.

[0068] Therefore, in the heat insulation sheet 100 according to this embodiment, the heat insulation sheet portion 120 and a pair of extended surfaces 110b are disposed between the first electrode tab 250a of the first battery cell 200a and the second electrode tab 250b of the second battery cell 200b, so that the heat insulation performance between the first electrode tab 250a of the first battery cell 200a and the second electrode tab 250b of the second battery cell 200b can be further ensured.

[0069] Figures 5 to 8 Examples include Figure 1 A diagram showing the shape in which the heat insulation sheet in the heat insulation component is covered by the encapsulation component. Figure 9 It is along Figure 4 A cross-sectional view taken along the b-b' axis.

[0070] Reference Figure 5 In the heat insulation sheet 100 according to this 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 heat insulation pad portion 120 and are connected to each other. More specifically, as Figure 5As shown, the first main body connecting surface 112a may be located between the first main body surface 111a and the second main body surface 113a, and the second main body connecting surface 114a may be located 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 encapsulation member 110, the first main body surface 111a, the first main body connecting surface 112a, the second main body surface 113a, the second main body connecting surface 114a, and the third main body surface 115a may be configured to be integral with each other.

[0071] Here, the first main body surface 111a, the second main body surface 113a and the third main body surface 115a can respectively cover the front surface and the rear surface of the heat insulation sheet 120, and the first main body connecting surface 112a and the second main body connecting surface 114a can respectively cover the upper surface and the lower surface of the heat insulation sheet 120.

[0072] The front surface of the heat insulation pad 120 can be placed on one of the first main body surface 111a, the second main body surface 113a and the third main body surface 115a, and the remaining main body surfaces can be folded sequentially in the direction covering the front and rear surfaces, as well as the upper and lower surfaces of the heat insulation pad 120.

[0073] As an example, such as Figure 5 As shown, the front surface of the heat insulation pad 120 can be placed on the second main body surface 113a. Subsequently, the first main body surface 111a and the third main body surface 115a can be folded sequentially in the direction covering the front and rear surfaces of the heat insulation pad 120, respectively.

[0074] As an example, such as Figure 6 As shown, the first main body surface 111a can be folded relative to the heat insulation pad portion 120 disposed on the second main body surface 113a in a direction covering the rear surface of the heat insulation pad portion 120. At this time, the upper surface of the heat insulation pad portion 120 can be covered by the first main body connecting surface 112a. Subsequently, as... Figure 7 As shown, with the first main body surface 111a covering the front surface of the heat insulation pad portion 120, the first main body surface 111a can be folded in the direction toward the third main body surface 115a.

[0075] Here, a pair of extending surfaces 110b can 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. In this case, the pair of extending surfaces 110b can be folded in the direction covering both ends of the heat insulation pad portion 120. As an example, such as... Figures 5 to 7 As shown, a pair of extending surfaces 110b can extend from both ends of the third body surface 115a.

[0076] More specifically, such as Figures 5 to 7As shown, each of the pair of extended surfaces 110b includes an extended connecting surface 111b connected to the third body surface 115a and an extended covering surface 112b covering the second body surface 113a. In other words, in the pair of extended surfaces 110b of the encapsulation member 110, the third body surface 115a, the extended connecting surface 111b, and the extended covering surface 112b can be configured to be integral with each other.

[0077] On the front and rear surfaces, as well as the upper and lower surfaces of the heat insulation pad 120, as shown... Figures 5 to 7 After being covered by the main body surface 110a, the other end of the pair of extended surfaces 110b can be as shown Figure 8 and Figure 9 The two ends of the second main body surface 113a are shown.

[0078] Therefore, while the entire outer surface of the heat insulation pad portion 120 is not exposed to the outside, the heat insulation sheet 100 according to this embodiment can be covered by the encapsulation member 110, thereby effectively supplementing the mechanical rigidity of the heat insulation pad portion 120. Additionally, as... Figure 9 As shown, the shape of the encapsulation member 110 covering the heat insulation sheet portion 120 minimizes the overlapping sections on the heat insulation sheet portion 120 and also simplifies the folding structure of the encapsulation member 110, which provides the advantage of further improving the assembly properties and productivity of the heat insulation sheet 100.

[0079] According to another embodiment of the present disclosure, the battery pack includes the aforementioned heat insulation sheet 100, wherein the battery pack includes: a plurality of battery cells; and at least one heat insulation sheet disposed between a pair of battery cells 200a, 200b that are positioned adjacent to each other.

[0080] Therefore, in the battery pack according to this embodiment, the heat insulation sheet 100 disposed between a pair of battery cells 200a and 200b positioned adjacent to each other provides uniform surface pressure to the battery cells 200a and 200b, so that the heat transfer phenomenon between the battery cells can be minimized or delayed for a predetermined period of time more effectively.

[0081] The battery module and battery pack including the battery module described above can be applied to a variety of devices. Specifically, such devices can be applied to vehicles such as electric bicycles, electric vehicles, and hybrid vehicles. However, this disclosure is not limited thereto, and can be applied to a variety of devices capable of using the battery module and battery pack including the battery module, which also fall within the scope of this disclosure.

[0082] Although preferred embodiments of the present disclosure have been shown and described above, the scope of the present disclosure is not limited thereto, and those skilled in the art can make many other changes and modifications to the embodiments using the basic principles of the invention as defined in the appended claims, which also fall within the spirit and scope of the invention.

[0083] [Description of reference numerals in the attached figures]

[0084] 100: Heat insulation sheet

[0085] 110: Encapsulation component

[0086] 110a: Main body surface

[0087] 111a: First main body surface

[0088] 112a: First main body connection surface

[0089] 113a: Second main body surface

[0090] 114a: Second main body connection surface

[0091] 115a: Third subject surface

[0092] 110b: Extended surface

[0093] 111b: Extended connection surface

[0094] 112b: Extended Covering Surface

[0095] 120: Heat insulation pad section

[0096] 200a: First battery cell

[0097] 200b: Second battery cell

Claims

1. A heat insulation sheet disposed between a first battery cell and a second battery cell, the heat insulation sheet comprising: Insulation pad section; as well as An encapsulation component that covers the entire outer surface of the heat insulation pad portion. The encapsulation component includes a main surface and a pair of extending surfaces. The main surface covers the front and rear surfaces, as well as the upper and lower surfaces, of the heat insulation pad. The pair of extending surfaces cover both ends of the heat insulation pad. Wherein, one end of the pair of extended surfaces is connected to the main body surface covering the rear surface of the heat insulation pad portion. The other end of the pair of extended surfaces passes through both ends of the heat insulation pad portion and extends respectively to both ends of the main body surface covering the front surface of the heat insulation pad portion. 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 surface of the heat insulation pad portion.

2. The heat insulation sheet according to claim 1, wherein, The encapsulation component, which is disposed between the first battery cell and the heat insulation pad and between the second battery cell and the heat insulation pad, comprises at least two layers or fewer layers.

3. The heat insulation sheet according to claim 1, wherein, The first battery cell and the second battery cell are respectively disposed at the same position on the front surface and the rear surface of the heat insulation pad.

4. The heat insulation sheet according to claim 3, wherein, The first battery cell and the second battery cell have the same dimensions.

5. The heat insulation sheet according to claim 1, wherein, The area between the other ends of the pair of extended surfaces on the front surface of the heat insulation pad is greater than or equal to the area of ​​one surface of the first battery cell that contacts the front surface of the heat insulation pad.

6. The heat insulation sheet according to claim 1, wherein, The first battery cell and the second battery cell each include a main body portion, in which an electrode assembly is built-in. The electrode tabs electrically connected to the electrode assembly are located at at least one end of the first battery cell and the second battery cell, respectively.

7. The heat insulation sheet according to claim 6, wherein, The main body of the first battery cell is disposed between the other ends of the pair of extended surfaces, and The electrode tabs of the first battery cell extend past the other end of the pair of extended surfaces and toward both ends of the heat insulation pad.

8. The heat insulation sheet according to claim 6, wherein, The electrode tabs include a positive electrode tab and a negative electrode tab, and The positive and negative electrodes, which are electrically connected to the electrode assembly, are located at the two ends of the first and second battery cells, respectively.

9. The heat insulation sheet according to claim 1, wherein, 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 heat insulation pad and are connected to each other. The pair of extending 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 heat insulation pad is disposed on one of the first main body surface, the second main body surface, and the third main body surface, and the remaining main body surfaces are folded in a direction that sequentially covers the front and rear surfaces, as well as the upper and lower surfaces of the heat insulation pad. The pair of extended surfaces are folded in the direction covering both ends of the heat insulation pad.

10. The heat insulation sheet according to claim 9, wherein, The front surface of the heat insulation pad is disposed on the second main body surface, and the first main body surface and the third main body surface are folded sequentially in the direction that respectively covers the front surface and the rear surface of the heat insulation pad.

11. The heat insulation sheet according to claim 10, wherein, The front surface of the heat insulation pad is disposed on the second main body surface, and the first main body surface is folded in the direction covering the rear surface of the heat insulation pad. With the rear surface of the heat insulation pad covered by the first main body surface, the first main body surface is folded in the direction toward the third main body surface, and The pair of extended surfaces extend from both ends of the third body surface and cover both ends of the second body surface.

12. The heat insulation sheet according to claim 1, wherein, The heat insulation pad is made of aerogel pad, and The encapsulation component includes a PET film.

13. The heat insulation sheet according to claim 12, wherein, The encapsulation component is coated with flame-retardant material on the upper and lower surfaces of the PET film, and Flame-retardant adhesive is applied to the surfaces of the upper and lower surfaces of the PET film that cover the heat insulation pad.

14. A battery pack, the battery pack comprising the heat insulation sheet according to claim 1, wherein, The battery pack includes: Multiple battery cells; and At least one of the heat insulation sheets is disposed between a pair of battery cells positioned adjacent to each other among the plurality of battery cells.

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