Battery device

Abstract

The technical concept of the present invention provides a battery device comprising a first frame, a plurality of battery cells provided on the first frame, and side pads disposed between the plurality of battery cells, wherein the side pads include an outer body in contact with the plurality of battery cells, an inner body provided within the internal space of the outer body, and a thermal foam layer extending along the inner body, the thermal foam layer containing a thermal foam material.

Description

Technical Field

[0001] The present invention relates to a battery device.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0071340 filed on May 31, 2024, and all the contents disclosed in the document of the Korean patent application are incorporated herein by reference.

Background Art

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as an energy source for various cordless devices such as handsets, notebook computers, and cordless cleaners. In recent years, due to the improvement of energy density and economies of scale, the manufacturing cost per unit capacity of secondary batteries has been significantly reduced, and as the driving range of battery electric vehicles (BEVs) has increased to a level comparable to that of fuel vehicles, the main application of secondary batteries has been shifting from mobile devices to mobility.

[0004] As secondary batteries are used in mobility, the requirements for the safety of secondary batteries are increasing. When an accident such as a fire occurs in a secondary battery used for mobility, it may endanger the life of the driver, so research on technologies to improve the safety of secondary batteries is essential.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technical problem to be achieved by the present invention is to provide a battery device.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, the technical concept of the present invention provides a battery device comprising a first frame, a plurality of battery cells provided on the first frame, and side pads disposed between the plurality of battery cells, wherein the side pads include an outer body that contacts the plurality of battery cells, an inner body provided within the internal space of the outer body, and a thermal foam layer extending along the inner body, the thermal foam layer containing a thermal foam material.

[0007] In an exemplary embodiment, the external body includes a pair of side walls, and the internal body extends between the pair of side walls of the external body.

[0008] In an exemplary embodiment, the external body and the internal body are characterized by containing the same metal.

[0009] In exemplary embodiments, the thermal foaming material is characterized by containing expanded graphite.

[0010] In an exemplary embodiment, the invention further includes a first thermally conductive adhesive layer for attaching the plurality of battery cells to the first frame.

[0011] In an exemplary embodiment, the invention further includes a first thermally conductive adhesive layer for attaching the plurality of battery cells to the first frame, wherein the bottom wall of the outer body facing the first thermally conductive adhesive layer includes a through hole that communicates with the internal space of the outer body.

[0012] In an exemplary embodiment, the internal body is characterized by including a plurality of holes.

[0013] In an exemplary embodiment, the thermal foaming layer is characterized by having a mesh structure.

[0014] In an exemplary embodiment, the thermal foam layer is characterized by extending further along the inner surface of the outer body.

[0015] In an exemplary embodiment, the first frame is characterized by including a cooling channel configured through which a cooling fluid flows.

[0016] In an exemplary embodiment, the system further includes a second frame provided on the plurality of battery cells, wherein the side pads include extensions connected to the second frame.

[0017] In an exemplary embodiment, the present invention further includes a second thermally conductive adhesive layer provided between the second frame and the extension of the side pad, which adheres the extension of the side pad to the second frame.

[0018] In an exemplary embodiment, the second frame is characterized by including a cooling channel configured through which a cooling fluid flows. [Effects of the Invention]

[0019] According to an exemplary embodiment of the present invention, a battery device is provided in which side pads configured to dissipate heat are placed between the battery cells, thereby improving the cooling performance for the battery cells.

[0020] According to an exemplary embodiment of the present invention, the side pads positioned between the battery cells include a thermal foam layer containing a thermal foaming material, thereby preventing or suppressing the transfer of heat generated in a battery cell experiencing a thermal event to other battery cells. This prevents or suppresses thermal transfer between battery cells and chain ignition of battery cells, thereby improving the safety and reliability of the battery device.

[0021] The effects obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those having ordinary knowledge in the technical field to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects associated with implementing the exemplary embodiments of the present disclosure can also be derived by those having ordinary knowledge in the technical field from the exemplary embodiments of the present disclosure.

Brief Description of the Drawings

[0022] [Figure 1] It is a cross-sectional view showing a battery device according to an exemplary embodiment of the present invention. [Figure 2] It is an enlarged view showing the region indicated by “II” in FIG. 1. [Figure 3] It is a cross-sectional view showing a battery device in which a thermal event has occurred. [Figure 4] It is a cross-sectional view showing a part of a battery device according to an exemplary embodiment of the present invention. [Figure 5] It is a cross-sectional view showing a battery device in which a thermal event has occurred. [Figure 6] It is a cross-sectional view showing a part of a battery device according to an exemplary embodiment of the present invention. [Figure 7] It is a cross-sectional view showing a part of a side pad according to an exemplary embodiment of the present invention. [Figure 8] It is a cross-sectional view showing a part of a battery device according to an exemplary embodiment of the present invention. [Figure 9] It is a cross-sectional view showing a part of a battery device according to an exemplary embodiment of the present invention.

Modes for Carrying Out the Invention

[0023] Preferred embodiments of the present invention will now be described in detail with reference to the attached drawings. As a premise, terms and words used herein and in the claims should not be interpreted in a manner limited to their general or dictionary meanings, but rather in a manner consistent with the technical spirit of the present invention, based on the principle that inventors may appropriately define the concepts of terms in order to best describe their own invention.

[0024] Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention; there may be a variety of equivalents and modifications that can substitute for them at the time of filing.

[0025] Furthermore, in describing the present invention, if it is determined that a specific description of a related known configuration or function may obscure the gist of the present invention, such detailed description will be omitted.

[0026] Since embodiments of the present invention are provided to give a more complete explanation to an ordinary person, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity. Accordingly, the sizes and proportions of each component do not fully reflect their actual sizes and proportions.

[0027] (First Embodiment) Figure 1 is a cross-sectional view showing a battery device 10 according to an exemplary embodiment of the present invention. Figure 2 is an enlarged view showing the region indicated by "II" in Figure 1.

[0028] Referring to Figures 1 and 2, the battery device 10 may include a housing 500 and a cell assembly 100. The battery device 10 may correspond to a battery pack or a battery module.

[0029] The housing 500 may provide an internal space for housing cell assemblies 100. One or more cell assemblies 100 may be housed in the internal space of the housing 500. The housing 500 may include a base frame 510, side frames 520, a top frame 530, and a plurality of internal frames 550.

[0030] The base frame 510 can support the cell assemblies 100. The base frame 510 may have a flat plate shape extending substantially in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction). Multiple cell assemblies 100 can be provided on the base frame 510, arranged in the first horizontal direction (e.g., the X direction) and the second horizontal direction (e.g., the Y direction).

[0031] The base frame 510 may include cooling channels 511 through which a cooling fluid flows. Cooling fluid supplied from outside the base frame 510 can be supplied to the inlet of the cooling channels 511, flow along the cooling channels 511, and discharged to the outside through the outlet of the cooling channels 511. Cooling can be performed on the cell assembly 100 while the cooling fluid flows along the cooling channels 511. The cooling fluid may include coolant and / or refrigerant. The housing 500 may be fitted with pipes configured to transmit cooling fluid to the cooling channels 511 of the base frame 510. Cooling fluid supplied from the outside can be transmitted to the cooling channels 511 of the base frame 510 via the pipes.

[0032] The side frame 520 may extend along the perimeter of the base frame 510 and surround the cell assembly 100.

[0033] The top frame 530 may be fastened onto the side frames 520 so as to cover a plurality of cell assemblies 100. The top frame 530 may have a flat plate shape extending in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction). The top frame 530 may be separated from the cell assemblies 100 in a vertical direction (e.g., the Z direction).

[0034] Multiple internal frames 550 can partition the internal space of the housing 500 into multiple accommodation spaces. One or more cell assemblies 100 may be arranged in each of the multiple accommodation spaces of the housing 500 defined by the multiple internal frames 550. In an exemplary embodiment, the multiple internal frames 550 may be spaced apart from each other in a first horizontal direction (e.g., the X direction), and each internal frame 550 may extend in a second horizontal direction (e.g., the Y direction). One cell assembly 100 may be arranged between a pair of internal frames 550. Each internal frame 550 may be in contact with the side surface of the cell assembly 100.

[0035] The cell assembly 100 can be mounted on the base frame 510. The cell assembly 100 may include a plurality of battery cells 110 and a plurality of side pads 130.

[0036] Each battery cell 110 is the basic unit of a lithium-ion battery, i.e., a secondary battery. Each battery cell 110 may include an electrode assembly, an electrolyte, and a cell case. The electrode assembly housed in the cell case may include a positive electrode, a negative electrode, and a separator membrane interposed between the positive and negative electrodes. Depending on the form of assembly, the electrode assembly may be either a jelly roll type or a stack type. A jelly roll type electrode assembly may include a winding structure of a positive electrode, a negative electrode, and a separator membrane interposed between them. A stack type electrode assembly may include a plurality of sequentially stacked positive electrodes, a plurality of negative electrodes, and a plurality of separator membranes interposed between them. The positive electrode may include a positive electrode current collector and a positive electrode active material. The negative electrode may include a negative electrode current collector and a negative electrode active material.

[0037] Each battery cell 110 may be a pouch-type battery cell, a cylindrical battery cell, or a prismatic battery cell. The electrode assembly of a pouch-type battery cell is housed in a pouch case containing an aluminum laminate sheet. The electrode assembly of a cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of a prismatic battery cell is housed in a prismatic metal can.

[0038] Multiple battery cells 110 provided to the cell assembly 100 can be connected in series and / or in parallel. For example, multiple battery cells 110 can be connected in series with each other. For example, multiple battery cells 110 can be connected in parallel with each other. For example, when a set of two or more battery cells 110 connected in parallel with each other is defined as a bank, one bank consisting of two or more battery cells 110 connected in parallel with each other and another bank consisting of two or more battery cells 110 connected in parallel with each other can be connected in series.

[0039] In exemplary embodiments, a plurality of battery cells 110 provided to a cell assembly 100 may be arranged in a first horizontal direction (e.g., the X direction), and individual battery cells 110 may extend in a second horizontal direction (e.g., the Y direction). Electrode leads may be provided at least one of the ends of individual battery cells 110 along the second horizontal direction (e.g., the Y direction). Electrode leads of adjacent battery cells 110 among the plurality of battery cells 110 may be electrically and physically connected to one another.

[0040] The cell assembly 100 may include busbar frames connected to the sides of a plurality of battery cells 110. Busbar frames may be positioned at each end of the cell assembly 100 along a second horizontal direction (e.g., the Y direction). The busbar frames may support the busbars and the electrode leads of the battery cells 110. The busbars may be electrically and physically connected to at least one of the electrode leads of the plurality of battery cells 110. The busbars may be joined to at least one of the electrode leads of the plurality of battery cells 110 by welding.

[0041] Multiple side pads 130 may be arranged on a base frame 510 and may be arranged in a first horizontal direction between a pair of internal frames 550. Each of the multiple side pads 130 may contact the side surface of a corresponding battery cell 110 among a plurality of battery cells 110. Multiple side pads 130 may be spaced apart from each other in a first horizontal direction (e.g., X direction) with at least one battery cell 110 in between. At least one battery cell 110 may be positioned between two adjacent side pads 130. The side pads 130 may have a flat plate shape that extends continuously in substantially a second horizontal direction (e.g., Y direction) and a vertical direction (e.g., Z direction). At least one of the two sides of the side pad 130 may contact a battery cell 110. The side pads 130 may be attached to the corresponding battery cell 110 by an adhesive material such as double-sided tape or adhesive.

[0042] Each side pad 130 can support the corresponding battery cell 110 in a first horizontal direction. Each side pad 130 supports the corresponding battery cell 110 in a first horizontal direction and can suppress or prevent deformation of the battery cell 110.

[0043] The side pad 130 may include an external body 131 and an internal body 133.

[0044] The external body 131 may form the exterior of the side pad 130 and provide the internal space 132. The external body 131 may include a pair of side walls 141 facing a first horizontal direction, a bottom wall 142 facing the base frame 510, and an upper wall 143 facing the top frame 530. The pair of side walls 141 of the external body 131 may each have a flat plate shape that extends continuously in a second horizontal direction (e.g., the Y direction) and a vertical direction (e.g., the Z direction). One of the pair of side walls 141 of the external body 131 may contact a battery cell 110 on one side of the side pad 130, and the other of the pair of side walls 141 may contact a battery cell 110 on the other side of the side pad 130. The bottom wall 142 may be connected to the lower end of each of the pair of side walls 141, and the upper wall 143 may be connected to the upper end of each of the pair of side walls 141. The external body 131 described above may contain a material with excellent thermal conductivity, and in this disclosure, the external body 131 may be referred to as a thermally conductive external body.

[0045] The internal body 133 may be provided within the internal space 132 of the external body 131. The internal body 133 may have a flat plate shape extending between a pair of side walls 141 of the external body 131. Since the pair of side walls 141 of the external body 131 are supported by the internal body 133, the rigidity of the side pad 130 may be enhanced. In exemplary embodiments, the side pad 130 may include a plurality of internal bodies 133 that are vertically spaced apart from each other. The internal bodies 133 may include a material with good thermal conductivity, and in this disclosure, the internal bodies 133 may be referred to as thermally conductive internal bodies.

[0046] The side pad 130 can be thermally coupled to the corresponding battery cell 110. The heat generated in the battery cell 110 can be dissipated through the outer body 131 and inner body 133 of the side pad 130. Since the side pad 130 is positioned to dissipate heat between the battery cells 110, the cooling performance for the battery cells 110 can be improved.

[0047] The outer body 131 and inner body 133 of the side pad 130 may contain materials with good thermal conductivity, such as metals. For example, the side pad 130 may contain aluminum, silver, gold, copper, tungsten, or a combination thereof. In exemplary embodiments, the outer body 131 and the inner body 133 may contain the same material or the same metal. In exemplary embodiments, in individual side bodies, the outer body 131 and the inner body 133 may be formed integrally with each other to form a single integrated structure. In some exemplary embodiments, the material of the outer body 131 and the material of the inner body 133 may be different from each other.

[0048] The side pad 130 may include a thermal foam layer 135 provided within the internal space 132 of the external body 131. The thermal foam layer 135 may contain a thermal foam material. The thermal foam material may be fire-resistant and configured to expand in volume above a certain temperature. When a thermal event such as ignition and / or thermal runaway of a battery cell 110 occurs in the battery device 10, the thermal foam material of the thermal foam layer 135 expands, and the expanded thermal foam material may form an insulating layer to thermally separate the battery cell 110 where the thermal event occurred from other battery cells 110.

[0049] In exemplary embodiments, the thermal foam layer 135 may be applied to the surface of the internal body 133. The thermal foam layer 135 may extend conformally along the surface of the internal body 133. The thermal foam layer 135 may cover the entire or partial surface of the internal body 133.

[0050] In exemplary embodiments, the thermal foaming material of the thermal foaming layer 135 may include expanded graphite, vermiculite, or a combination thereof.

[0051] In exemplary embodiments, the thermal foam layer 135 may comprise a base layer and thermal foam particles contained within the base layer. The base layer may consist of a polymer, such as polyurethane or silicone. The thermal foam particles may be particles or capsules containing a thermal foaming substance.

[0052] In exemplary embodiments, the thermal foaming material of the thermal foaming layer 135 may be configured to expand 10 to 50 times in volume when the foaming initiation temperature is exceeded. The foaming initiation temperature may be 100°C or higher, 200°C or higher, 300°C or higher, 400°C or higher, or 500°C or higher.

[0053] A first thermally conductive adhesive layer 210 may be placed between the base frames 510 of the cell assembly 100. The first thermally conductive adhesive layer 210 can adhere a plurality of battery cells 110 to the base frames 510. The upper part of the first thermally conductive adhesive layer 210 may be in direct contact with each of the plurality of battery cells 110, and the lower part of the first thermally conductive adhesive layer 210 may be in direct contact with the base frames 510. The first thermally conductive adhesive layer 210 can thermally bond each of the plurality of battery cells 110 to the base frames 510. The first thermally conductive adhesive layer 210 may include a thermal resin and / or a thermal interface material.

[0054] Furthermore, the first thermally conductive adhesive layer 210 may contact the bottom wall 142 of the outer body 131 of the side pad 130, thereby thermally and physically bonding the side pad 130 to the base frame 510. In an exemplary embodiment, the outer body 131 of the side pad 130 may be thermally bonded to the base frame 510 by the first thermally conductive adhesive layer 210, and heat generated in the battery cell 110 may be transferred to the base frame 510 via the side pad 130.

[0055] Figure 3 is a cross-sectional view showing the battery device 10 where a thermal event occurred.

[0056] Referring to Figure 3, when a thermal event such as ignition of a battery cell 110 occurs in the battery device 10, the thermal foam material of the thermal foam layer 135 of the side pad 130 surrounding the battery cell 110P where the thermal event occurred expands, and the expanded thermal foam material can form an insulating layer 191 that at least partially fills the internal space 132 of the outer body 131 of the side pad 130. The insulating layer 191 can prevent or suppress the transfer of heat generated in the battery cell 110P where the thermal event occurred to other battery cells 110. Since thermal transfer between battery cells 110 and chain ignition of battery cells 110 can be prevented or suppressed, the safety and reliability of the battery device 10 can be improved.

[0057] (Second Embodiment) Figure 4 is a cross-sectional view showing a part of a battery device according to an exemplary embodiment of the present invention. Figure 5 is a cross-sectional view showing a battery device in which a thermal event has occurred. The battery devices of Figures 4 and 5 will be described below, focusing on the differences from the battery device 10 described with reference to Figures 1 and 2.

[0058] Referring to Figures 4 and 5, the bottom wall 142 of the outer body 131 of the side pad 130A may face the first thermally conductive adhesive layer 210, and the bottom wall 142 of the outer body 131 of the side pad 130A may include a through hole 1421. The through hole 1421 provided in the bottom wall 142 of the outer body 131 may communicate with the internal space 132 of the outer body 131.

[0059] As shown in Figure 5, when a thermal event occurs in the battery device, the thermal foam material of the thermal foam layer 135 of the side pad 130A surrounding the battery cell 110P where the thermal event occurred expands, and the expanded thermal foam material can be discharged to the outside of the outer body 131 through the through hole 1421 of the outer body 131. Then, the first thermal conductive adhesive layer 210 surrounding the battery cell 110P where the thermal event occurred may undergo thermal deformation, forming an empty space and / or cavity, and the empty space and / or cavity formed by the thermal deformation of the first thermal conductive adhesive layer 210 may be filled with the expanded thermal foam material to form an insulating layer 192. Heat transfer between the battery cell 110P where the thermal event occurred and the base frame 510 is suppressed or blocked by the insulating layer 192, so that the heat generated in the battery cell 110P where the thermal event occurred does not transfer to other battery cells 110 via the base frame 510. Since thermal transfer between battery cells 110 and chain ignition of battery cells 110 can be prevented or suppressed, the safety and reliability of the battery device can be improved.

[0060] (Third embodiment) Figure 6 is a cross-sectional view showing a part of a battery device according to an exemplary embodiment of the present invention. The battery device of Figure 6 will be described below, focusing on the differences from the battery device 10 described with reference to Figures 1 and 2.

[0061] Referring to Figure 6, the internal body 133 of the side pad 130B may include at least one hole 1331. At least one hole 1331 in the internal body 133 may penetrate the internal body 133 perpendicularly. In an exemplary embodiment, the internal body 133 of the side pad 130B may include a plurality of holes 1331 arranged in the form of a one-dimensional or two-dimensional array. When the thermal foam material of the thermal foam layer 135 expands, the expanded thermal foam material may move perpendicularly through the holes 1331 in the internal body 133. Because the internal body 133 has holes 1331 that allow the movement of expanded thermal foam material, when a thermal event occurs in the battery device, an insulating layer (see 191 in Figure 3) filling the internal space 132 of the external body 131 of the side pad 130B can be formed more quickly.

[0062] (Fourth Embodiment) Figure 7 is a cross-sectional view showing a portion of the side pad 130C according to an exemplary embodiment of the present invention. The side pad 130C of Figure 7 will be described below, focusing on the differences from the side pad 130 of the battery device 10 described with reference to Figures 1 and 2.

[0063] Referring to Figure 7, the thermal foam layer 135A of the side pad 130C may have a mesh structure, a net structure, or a grid structure. The thermal foam layer 135A may contain a plurality of holes 1351. The plurality of holes 1351 of the thermal foam layer 135A may be arranged in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction). When viewed from a plane, the plurality of holes 1351 of the thermal foam layer 135A may be circular or polygonal, such as a square.

[0064] In exemplary embodiments, the internal body 133A may have a mesh structure, a net structure, or a grid structure. The internal body 133A may include a plurality of holes. For example, the thermal foaming layer 135A of the side pad 130C may be applied to the internal body 133A having a mesh structure and may have a mesh structure corresponding to the mesh structure of the internal body 133A.

[0065] (Fifth embodiment) Figure 8 is a cross-sectional view showing a part of a battery device according to an exemplary embodiment of the present invention. The battery device of Figure 8 will be described below, focusing on the differences from the battery device 10 described with reference to Figures 1 and 2.

[0066] Referring to Figure 8, in the side pad 130D, the thermal foam layer 135B may further extend along the inner surface of the outer body 131 that defines the internal space 132. The thermal foam layer 135B may conformally extend along the inner surface of the outer body 131. The thermal foam layer 135B may cover the inner surface of the outer body 131 entirely or partially.

[0067] (Sixth Embodiment) Figure 9 is a cross-sectional view showing a part of a battery device 10A according to an exemplary embodiment of the present invention. The battery device 10A of Figure 9 will be described below, focusing on the differences from the battery device 10 described with reference to Figures 1 and 2.

[0068] Referring to Figure 9, in the battery device 10A, the housing 500 may include a cooling frame 560 positioned on the cell assembly 100A. The cooling frame 560 may be positioned on a plurality of battery cells 110 and a plurality of side pads 130E. The cooling frame 560 may include cooling channels 561 configured for the flow of a cooling fluid. The cooling fluid may include cooling water and / or a refrigerant. The cooling fluid supplied from the outside may flow along the cooling channels 561 of the cooling frame 560 and then be discharged to the outside. Cooling can be performed on the battery cells 110 while the cooling fluid flows along the cooling channels 561 of the cooling frame 560.

[0069] Each of the side pads 130E may include an extension 137 that contacts the cooling frame 560. In each side pad 130E, the extension 137 may extend upward from the upper wall 143 of the outer body 131. The extension 137 may be integral with the outer body 131 and may contain the same material as the outer body 131.

[0070] Multiple side pads 130E can be bonded to a cooling frame 560 via a second thermally conductive adhesive layer 220. The second thermally conductive adhesive layer 220 can be interposed between each of the extensions 137 of the multiple side pads 130E and the cooling frame 560. The second thermally conductive adhesive layer 220 can extend along the extensions 137 of the multiple side pads 130E. The second thermally conductive adhesive layer 220 can be separated from the multiple battery cells 110 with the extensions 137 of the multiple side pads 130E in between. The upper part of the second thermally conductive adhesive layer 220 can be in direct contact with the cooling frame 560, and the lower part of the second thermally conductive adhesive layer 220 can be in direct contact with the extensions 137 of the multiple side pads 130E. The battery cells 110 can be thermally bonded to the cooling frame 560 via the multiple side pads 130E and the second thermally conductive adhesive layer 220. The second thermally conductive adhesive layer 220 may include a thermal resin and / or a thermal interface material.

[0071] The present invention has been described in more detail above with reference to the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be a variety of equivalents and modifications that can be substituted for them at the time of filing.

Claims

1. The first frame and, Multiple battery cells provided on the first frame, A side pad positioned between the aforementioned plurality of battery cells, Includes, The aforementioned side pad is An external body that contacts the plurality of battery cells, An internal body provided within the internal space of the external body, A thermal foam layer extending along the internal body, comprising a thermal foam layer containing a thermal foaming material, A battery device, including a battery.

2. The external body includes a pair of side walls, The battery device according to claim 1, wherein the internal body extends between the pair of side walls of the external body.

3. The battery device according to claim 1, wherein the external body and the internal body contain the same metal.

4. The battery device according to claim 1, wherein the thermal foaming material contains expanded graphite.

5. A first thermally conductive adhesive layer for attaching the plurality of battery cells to the first frame. The battery device according to claim 1, further comprising:

6. The system further includes a first thermally conductive adhesive layer for attaching the plurality of battery cells to the first frame, The battery device according to any one of claims 1 to 5, wherein the bottom wall of the outer body facing the first thermally conductive adhesive layer includes a through hole that communicates with the internal space of the outer body.

7. The battery device according to claim 1, wherein the internal body includes a plurality of holes.

8. The battery device according to claim 1, wherein the thermal foam layer has a mesh structure.

9. The battery device according to claim 1, wherein the thermal foam layer further extends along the inner surface of the outer body.

10. The battery device according to claim 1, wherein the first frame includes a cooling channel configured for the flow of a cooling fluid.

11. Further including a second frame provided on the plurality of battery cells, The battery device according to claim 1, wherein the side pad includes an extension connected to the second frame.

12. The battery device according to claim 11, further comprising a second thermally conductive adhesive layer provided between the second frame and the extension portion of the side pad, the second thermally conductive adhesive layer for attaching the extension portion of the side pad to the second frame.

13. The battery device according to claim 11, wherein the second frame includes a cooling channel configured for the flow of a cooling fluid.

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