Battery pack

Abstract

The battery pack of the present invention includes a base plate, a plurality of side walls extending from an upper surface of the base plate in a first direction perpendicular to the upper surface of the base plate, and a plurality of battery devices arranged in a space defined by the upper surface of the base plate and the plurality of side walls, and the base plate includes expanded foam, thereby protecting the battery from external impact while maintaining a constant battery temperature.

Description

[Technical Field]

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

[0002] This disclosure claims the benefit of priority based on Korean Patent Application No. 10-2023-0120261, dated September 11, 2023, the entire contents of which are incorporated by reference into this disclosure. [Background technology]

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as mobile phones, laptops, and wireless vacuum cleaners. In recent years, improvements in energy density and economies of scale have dramatically reduced the manufacturing costs of electrically powered hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs). As the driving range of BEVs has increased to the same level as that of fuel-powered vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0004] As secondary batteries are used in mobility, there is an increasing demand for stability of secondary batteries. This necessitates a battery pack that can protect the secondary battery from external shocks while maintaining a constant temperature of the secondary battery. Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to provide a battery pack that can protect the battery from external shocks while maintaining a constant temperature of the battery. [Means for solving the problem]

[0006] To solve the above-mentioned problems, some embodiments provide a battery pack including a base plate, a plurality of side walls extending from an upper surface of the base plate in a first direction perpendicular to the upper surface of the base plate, and a plurality of battery devices disposed in a space defined by the upper surface of the base plate and the plurality of side walls, and the base plate may include expanded foam.

[0007] The base plate may include at least one hollow.

[0008] The base plate may be manufactured by an extrusion process.

[0009] The base plate may be seamless.

[0010] At least one of the side walls may include expanded foam.

[0011] The side walls may include at least one hollow.

[0012] The side walls may be manufactured by an extrusion process.

[0013] The side walls may be seamless.

[0014] The battery pack may further include a first partition interposed between the plurality of battery devices, and a plurality of second partitions perpendicular to the first partition and interposed between the plurality of battery devices, and the first partition may include expanded foam.

[0015] The first partition wall may include at least one hollow.

[0016] At least one of the plurality of second partition walls may include expanded foam.

[0017] The plurality of second partition walls may include at least one hollow.

[0018] The expanded foam may be one or more selected from the group consisting of polyurethane foam and silicone foam.

[0019] The battery pack includes a base plate, a plurality of side walls extending from an upper surface of the base plate in a first direction perpendicular to the upper surface of the base plate, and a plurality of battery devices arranged in a space defined by the upper surface of the base plate and the plurality of side walls, and an expanded foam layer including expanded foam may be arranged on the lower surface of the base plate.

[0020] The expanded foam may be one or more selected from the group consisting of polyurethane foam and silicone foam. [Effects of the Invention]

[0021] The battery pack according to the present invention can protect the battery from external shocks while maintaining a constant temperature of the battery, thereby improving the stability of the battery pack.

[0022] The effects of the present invention are not limited to those mentioned above, and a person skilled in the art to which the present invention pertains can clearly derive and understand effects not mentioned in this specification. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is an exploded perspective view illustrating a battery pack according to some embodiments. [Figure 2] FIG. 1A is a cross-sectional view taken along the line 1A-1A′ in FIG. [Figure 3] FIG. 1B is a cross-sectional view taken along the line 1B-1B′ in FIG. [Figure 4] FIG. 10 is a cross-sectional view illustrating a battery pack according to some other embodiments. [Figure 5] FIG. 10 is a cross-sectional view illustrating a battery pack according to some other embodiments. [Figure 6] FIG. 10 is a cross-sectional view illustrating a battery pack according to some other embodiments. [Figure 7] FIG. 10 is a cross-sectional view illustrating a battery pack according to some other embodiments. [Figure 8] FIG. 10 is an exploded perspective view illustrating a battery pack according to some other embodiments. [Figure 9] 8A is a cross-sectional view taken along section line 8A-8A' in FIG. 8. [Figure 10] 8B is a cross-sectional view taken along the line 8B-8B' in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] The terms and words used in this specification should not be interpreted as being limited to their ordinary or dictionary meanings, but rather as meanings that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the meaning of the terms and words in order to best explain his / her own invention.

[0025] The embodiments and drawings are merely examples of the present invention and do not fully represent the technical ideas of the present invention, and therefore there may be various equivalents and modifications that can replace them at the time of filing this application.

[0026] Furthermore, in the description of the present invention, if it is determined that a specific description of a known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

[0027] The drawings are provided to more completely explain the present invention to those skilled in the art, and therefore the shape, size, number, etc. of components in the drawings may be exaggerated, omitted, or shown in a schematic manner for clearer explanation. Therefore, the shape, size, proportion, and number of each component in the drawings do not completely reflect the shape, size, proportion, and number of each actual component.

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0029] (First embodiment) FIG. 1 is an exploded perspective view illustrating a battery pack according to some embodiments.

[0030] FIG. 2 is a cross-sectional view taken along section line 1A-1A' of FIG.

[0031] FIG. 3 is a cross-sectional view taken along section line 1B-1B' of FIG.

[0032] 1 to 3, the battery pack 100 may include a base plate 110, a plurality of side walls 120A, 120B, 130A, and 130B, a plurality of battery devices 140, a first partition wall 150, a plurality of second partition walls 160, an electrical component partition wall 170, and a lid 180. The battery pack 100 may be the final form of a battery system to be mounted on a mobility device or the like.

[0033] Hereinafter, two directions substantially parallel to the upper surface 110T of the base plate 110 are defined as the X direction and the Y direction, respectively, and a direction substantially perpendicular to the upper surface 110T of the base plate 110 is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other.

[0034] The base plate 110 can support a plurality of side walls 120A, 120B, 130A, 130B, a plurality of battery devices 140, a first partition wall 150, a plurality of second partition walls 160, and an electrical component partition wall 170.

[0035] In some embodiments, the base plate 110 may include at least one hollow 111. The hollow 111 may be exposed to the outside of the base plate 110. The hollow 111 may extend in the X direction from a side surface of the base plate 110. The extension direction of the hollow 111 may be substantially perpendicular to the Y direction. As a non-limiting example, the shape of the hollow 111 may be a rounded rectangular prism, a rectangular prism, a circular cylinder, an elliptical cylinder, or the like. The base plate 110 may include two or more hollows 111. The multiple hollows 111 may be substantially parallel to each other. The shapes of the multiple hollows 111 may be different from each other. The multiple hollows 111 may all have the same shape. The volumes of the multiple hollows 111 may be different from each other.

[0036] In some embodiments, the base plate 110 may be manufactured by an extrusion process. By way of non-limiting example, the extrusion process may be a direct extrusion process or an indirect extrusion process. In some embodiments, the base plate 110 may be made of aluminum or an alloy containing aluminum. The hollow 111 in the base plate 110 may be formed by the extrusion process.

[0037] In some embodiments, the base plate 110 may be seamless. The base plate 110 may be seamless by being manufactured by the extrusion process described above. As used herein, "seamless" may mean that there are no joints or lines of contact in the hollow 111 of the base plate 110.

[0038] In some embodiments, the base plate 110 may include expanded foam 112. In some embodiments, the expanded foam 112 may be disposed in at least one hollow 111 of the base plate 110. The expanded foam 112 may be disposed in at least one of the plurality of hollows 111 of the base plate 110. The volume of the expanded foam 112 may be substantially the same as the volume of the hollow 111. The volume of the expanded foam 112 may be smaller than the volume of the hollow 111.

[0039] In some embodiments, the expanding foam 112 may be one or more selected from the group consisting of polyurethane foam and silicone foam.

[0040] By including the foam 112 in the base plate 110, even if an impact is applied to the lower part of the battery pack 100, the foam 112 can absorb the impact and protect the plurality of battery devices 140 from external impact. By including the foam 112 in the base plate 110, heat transfer between the inside and outside of the battery pack 100 can be blocked, and the temperature of the plurality of battery devices 140 can be kept constant.

[0041] As a non-limiting example, the base plate 110 may include a cooling channel (not shown). By including the cooling channel in the base plate 110, even if a thermal runaway event occurs in the battery device 140, the coolant flowing through the cooling channel can absorb heat and prevent the thermal runaway event from spreading to adjacent battery devices 140.

[0042] The plurality of side walls 120A, 120B, 130A, and 130B may extend in the Z direction from the upper surface 110T of the base plate. For ease of explanation, the side walls 120A and 120B extending in the X direction will be referred to as first side walls 120A and 120B, and the side walls 130A and 130B extending in the Y direction will be referred to as second side walls 130A and 130B. The first side walls 120A and 120B and the second side walls 130A and 130B may protect the plurality of battery devices 140, the first partition wall 150, the plurality of second partition walls 160, and the electrical component partition wall 170.

[0043] The first sidewalls 120A, 120B can be substantially parallel to the X direction and substantially perpendicular to the Y direction. The second sidewalls 130A, 130B can be substantially parallel to the Y direction and substantially perpendicular to the X direction. The first sidewalls 120A, 120B can be substantially perpendicular to the second sidewalls 130A, 130B. The first sidewalls 120A, 120B can extend in the Z direction from a long side region of the top surface 110T of the base plate. The second sidewalls 130A, 130B can extend in the Z direction from a short side region of the top surface 110T of the base plate.

[0044] In some embodiments, the first side wall 120A may include at least one hollow 121A. The hollow 121A may be exposed to the outside of the first side wall 120A. The first side wall 120A may include another hollow (not shown) that is connected to the hollow 121A and exposed to the outside of the first side wall 120A. The hollow 121A may extend in the X direction from a side surface of the first side wall 120A. The extension direction of the hollow 121A may be substantially perpendicular to the Y direction. As non-limiting examples, the shape of the hollow 121A may be a rounded rectangular prism, a rectangular prism, a circular cylinder, an elliptical cylinder, or the like. The first side wall 120A may include two or more hollows 121A. The multiple hollows 121A may be substantially parallel to each other. The shapes of the multiple hollows 121A may be different from each other. The multiple hollows 121A may all have the same shape. The volumes of the plurality of hollows 121A may be different from one another. In some embodiments, the first side wall 120B may include at least one hollow 121B. The hollow 121B may be substantially the same as the hollow 121A, and therefore a redundant description thereof will be omitted.

[0045] In some embodiments, the second side wall 130A may include at least one hollow 131A. The second side wall 130A may include another hollow (not shown) that is connected to the hollow 131A and exposed to the outside of the second side wall 130A. This allows the hollow 131A to be exposed to the outside of the second side wall 130A. The hollow 131A may extend in the Y direction from a side surface of the second side wall 130A. The extension direction of the hollow 131A may be substantially perpendicular to the X direction. As a non-limiting example, the shape of the hollow 131A may be a rounded rectangular prism, a rectangular prism, a circular cylinder, an elliptical cylinder, or the like. The second side wall 130A may include two or more hollows 131A. The multiple hollows 131A may be substantially parallel to each other. The shapes of the multiple hollows 131A may be different from each other. The multiple hollows 131A may all have the same shape. The volumes of the plurality of hollows 131A may differ from one another. In some embodiments, the second side wall 130B may include at least one hollow 131B. The hollow 131B may be substantially the same as the hollow 131A, and therefore a redundant description thereof will be omitted.

[0046] In some embodiments, the first side walls 120A, 120B and the second side walls 130A, 130B can be manufactured by an extrusion process. By way of non-limiting example, the extrusion process can be a direct extrusion process or an indirect extrusion process. In some embodiments, the first side walls 120A, 120B and the second side walls 130A, 130B can be made of aluminum or an aluminum-containing alloy. The hollows 131A, 131B in the first side walls 120A, 120B and the second side walls 130A, 130B can be formed by the extrusion process.

[0047] In some embodiments, the first side walls 120A, 120B and the second side walls 130A, 130B may be seamless. The first side walls 120A, 120B and the second side walls 130A, 130B may be seamless by being manufactured by the extrusion process described above.

[0048] As a non-limiting example, the first side walls 120A, 120B and the second side walls 130A, 130B may include cooling channels (not shown). By including the cooling channels in the first side walls 120A, 120B and the second side walls 130A, 130B, even if a thermal runaway event occurs in the battery device 140, the coolant flowing through the cooling channels can absorb heat and prevent the thermal runaway event from spreading to adjacent battery devices 140.

[0049] In some exemplary embodiments, the second side wall 130B may include a plurality of exhaust holes (not shown), which may be configured to provide a path for exhausting gas, heat, and vaporized coolant inside the battery pack 100.

[0050] The plurality of battery devices 140 can be configured to store energy. As a non-limiting example, each of the plurality of battery devices 140 can be a cell unit including a plurality of battery cells. Each of the plurality of battery devices 140 does not need to include a module frame. An assembly method in which the cell unit is mounted in a battery pack can be called a cell-to-pack. A battery pack assembled using a cell-to-pack can be called a module-less type battery pack.

[0051] As a non-limiting example, each of the plurality of battery devices 140 may be a battery module. The battery module includes a cell unit including a plurality of battery cells and a module frame in which the cell unit is mounted. An assembly method in which the cell unit is mounted in a module frame with at least one side open, and the module frame is mounted in a battery pack, is sometimes called a cell-to-pack.

[0052] Each of the battery cells may be a secondary battery, a lithium secondary battery, or one of a lithium ion battery, a lithium ion polymer battery, a lithium metal battery, and a lithium polymer battery.

[0053] The shape of each of the plurality of battery cells may be any one of a cylindrical shape, a square shape, and a pouch shape. The shape of the battery cell refers to the shape of the battery case.

[0054] The first partition wall 150 and the plurality of second partition walls 160 can isolate the plurality of battery devices 140 and the plurality of electrical components (not shown) from one another, thereby protecting the plurality of battery devices 140 and the plurality of electrical components (not shown) and preventing short circuits therebetween.

[0055] The first partition wall 150 may be interposed between the plurality of battery devices 140. The first partition wall 150 may extend in the X direction. The first partition wall 150 may extend between the second side wall 130A and the electrical component partition wall 170. The first partition wall 150 may contact each of the second side wall 130A and the electrical component partition wall 170. Each of the plurality of second partition walls 160 may be interposed between the plurality of battery devices 140. Each of the plurality of second partition walls 160 may extend in the Y direction. Each of the plurality of second partition walls 160 may extend between the first partition wall 150 and one of the first side walls 120A, 120B. Each of the plurality of second partition walls 160 may contact each of the first partition wall 150 and one of the first side walls 120A, 120B.

[0056] In some embodiments, the first partition 150 may include at least one hollow 151. The first partition 150 may include another hollow (not shown) that is connected to the hollow 151 and exposed to the outside of the first partition 150. This allows the hollow 151 to be exposed to the outside of the first partition 150. The hollow 151 may extend in the X direction from a side surface of the first partition 150. The extension direction of the hollow 151 may be substantially perpendicular to the Y direction. As a non-limiting example, the shape of the hollow 151 may be a rounded rectangular prism, a rectangular prism, a circular cylinder, an elliptical cylinder, or the like. The first partition 150 may include two or more hollows 151. The multiple hollows 151 may be substantially parallel to each other. The shapes of the multiple hollows 151 may be different from each other. The multiple hollows 151 may all have the same shape. The volumes of the multiple hollows 151 may be different from each other.

[0057] In some embodiments, each of the second partition walls 160 may include at least one hollow 161. Each of the second partition walls 160 may include another hollow (not shown) that is connected to the hollow 161 and exposed to the outside of the second partition walls 160. This allows the hollow 161 to be exposed to the outside of the second partition walls 160. The hollow 161 may extend in the Y direction from a side surface of each of the second partition walls 160. The extension direction of the hollow 161 may be substantially perpendicular to the X direction. As a non-limiting example, the shape of the hollow 161 may be a rounded rectangular prism, a rectangular prism, a circular cylinder, an elliptical cylinder, or the like. Each of the second partition walls 160 may include two or more hollows 161. The hollows 161 may be substantially parallel to each other. The shapes of the hollows 161 may be different from each other. All of the hollows 161 may have the same shape. The volumes of the plurality of hollows 161 may differ from one another.

[0058] In some embodiments, the first partition wall 150 and the plurality of second partition walls 160 may be manufactured by an extrusion process. As a non-limiting example, the extrusion process may be a direct extrusion process or an indirect extrusion process. In some embodiments, the material of the first partition wall 150 and the plurality of second partition walls 160 may be aluminum or an alloy containing aluminum. The hollows 151, 161 of the first partition wall 150 and the plurality of second partition walls 160 may be formed by the extrusion process.

[0059] In some embodiments, the first partition wall 150 and the plurality of second partition walls 160 may be seamless. The first partition wall 150 and the plurality of second partition walls 160 may be seamless by being manufactured by the extrusion process described above.

[0060] The electrical component partition 170 can extend in the Y direction. The electrical component partition 170 can extend between the first side walls 120A, 120B. The electrical component partition 170 can be in contact with each of the first side walls 120A, 120B. The electrical component partition 170 can isolate a plurality of electrical components (not shown) from a plurality of battery devices 140. The electrical component partition 170 can be interposed between a plurality of electrical components (not shown) and a plurality of battery devices 140.

[0061] In some embodiments, the electrical component partition 170 may include at least one hollow 171. The electrical component partition 170 may include another hollow (not shown) that is connected to the hollow 171 and exposed to the outside of the electrical component partition 170. This allows the hollow 171 to be exposed to the outside of the electrical component partition 170. The hollow 171 may extend in the Y direction from a side surface of the electrical component partition 170. The extension direction of the hollow 171 may be substantially perpendicular to the X direction. As a non-limiting example, the shape of the hollow 171 may be a rounded rectangular prism, a rectangular prism, a circular cylinder, an elliptical cylinder, or the like. The electrical component partition 170 may include two or more hollows 171. The multiple hollows 171 may be substantially parallel to each other. The shapes of the multiple hollows 171 may be different from each other. The multiple hollows 171 may all have the same shape. The volumes of the plurality of hollows 171 may differ from one another.

[0062] In some embodiments, the electrical component bulkhead 170 may be manufactured by an extrusion process. By way of non-limiting example, the extrusion process may be a direct extrusion process or an indirect extrusion process. In some embodiments, the material of the electrical component bulkhead 170 may be aluminum or an aluminum-containing alloy. The hollow 171 of the electrical component bulkhead 170 may be formed by the extrusion process.

[0063] In some embodiments, the electrical component bulkhead 170 may be seamless. The electrical component bulkhead 170 may be seamless due to being manufactured by the extrusion process described above.

[0064] As a non-limiting example, the battery pack 100 may include a plurality of electrical components (not shown). The electrical components (not shown) may be disposed in a space defined by the upper surface 110T of the base plate, the first side walls 120A and 120B, the electrical component partition 170, and the second side wall 130B. The electrical components (not shown) may include any electronic elements necessary to operate the battery pack.

[0065] The lid 180 can be coupled to the first side walls 120A, 120B and the second side walls 130A, 130B. As a non-limiting example, the lid 180 can be fixed to the first side walls 120A, 120B and the second side walls 130A, 130B by a mechanical coupling means such as a bolt. The lid 180 can cover a plurality of battery devices 140, a first partition 150, a plurality of second partitions 160, an electrical component partition 170, and a plurality of electrical components (not shown). The lid 180 can have a flat plate shape.

[0066] (Second embodiment) FIG. 4 is a cross-sectional view illustrating a battery pack 100' according to some other embodiments.

[0067] Regarding the second embodiment, only the differences from the first embodiment will be described.

[0068] 4, in some embodiments, the first side walls 120A, 120B can include expanded foam 122A, 122B. In some embodiments, the expanded foam 122A, 122B can be disposed in at least one hollow 121A, 121B of the first side walls 120A, 120B. The volume of the expanded foam 122A, 122B can be substantially the same as the volume of the hollow 121A, 121B. The volume of the expanded foam 122A, 122B can be smaller than the volume of the hollow 121A, 121B.

[0069] (Third embodiment) FIG. 5 is a cross-sectional view illustrating a battery pack 100'' according to some other embodiments.

[0070] Regarding the third embodiment, only the differences from the first embodiment will be described.

[0071] 5, in some embodiments, the second side walls 130A, 130B can include expanded foam 132A, 132B. In some embodiments, the expanded foam 132A, 132B can be disposed in at least one hollow 131A, 131B of the second side walls 130A, 130B. The volume of the expanded foam 132A, 132B can be substantially the same as the volume of the hollow 131A, 131B. The volume of the expanded foam 132A, 132B can be smaller than the volume of the hollow 131A, 131B.

[0072] (Fourth embodiment) FIG. 6 is a cross-sectional view illustrating a battery pack 100''' according to some other embodiments.

[0073] Regarding the fourth embodiment, only the differences from the second embodiment will be described.

[0074] 6 , in some embodiments, the first partition 150 may include expanded foam 152. In some embodiments, the expanded foam 152 may be disposed in at least one hollow 151 of the first partition 150. The volume of the expanded foam 152 may be substantially the same as the volume of the hollow 151. The volume of the expanded foam 152 may also be smaller than the volume of the hollow 151.

[0075] (Fifth embodiment) FIG. 7 is a cross-sectional view illustrating a battery pack 100'''' according to some other embodiments.

[0076] Regarding the fifth embodiment, only the parts that differ from the third embodiment will be described.

[0077] 7 , in some embodiments, the plurality of second partition walls 160 may include expanded foam 162. In some embodiments, the expanded foam 162 may be disposed in at least one hollow 161 of the plurality of second partition walls 160. The volume of the expanded foam 162 may be substantially the same as the volume of the hollow 161. The volume of the expanded foam 162 may also be smaller than the volume of the hollow 161.

[0078] In some embodiments, the electrical component bulkhead 170 can include expanded foam 172. In some embodiments, the expanded foam 172 can be disposed in at least one hollow 171 of the electrical component bulkhead 170. The volume of the expanded foam 172 can be substantially the same as the volume of the hollow 171. The volume of the expanded foam 172 can also be smaller than the volume of the hollow 171.

[0079] (Sixth embodiment) FIG. 8 is an exploded perspective view illustrating a battery pack 200 according to some other embodiments.

[0080] FIG. 9 is a cross-sectional view taken along section line 8A-8A' of FIG.

[0081] FIG. 10 is a cross-sectional view taken along section line 8B-8B' of FIG.

[0082] Regarding the sixth embodiment, only the parts that are different from the first embodiment will be described.

[0083] In some embodiments, an expanded foam layer 290 including expanded foam may be disposed on the lower surface 210B of the base plate. In this case, the base plate 210 may not include the expanded foam 212.

[0084] The above description is merely illustrative of the present invention, and the scope of the present invention should be interpreted by the claims, and all technical ideas that are equivalent or within the scope of the claims should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0085] 100 Battery Pack 100' Battery Pack 100'' Battery Pack 100'' battery pack 100'' Battery Pack 110 base plate 110T top surface 111 Hollow 112 Expanding Foam 120A First side wall 120B 1st side wall 121A Hollow 121B Hollow 122A Expanded Foam 122B Expanded Foam 130A Second side wall 130B Second side wall 131A Hollow 131B Hollow 132A Expanded Foam 132B Expanded Foam 140 Battery Device 150 1st bulkhead 151 Hollow 152 Expanding Foam 160 2nd bulkhead 161 Hollow 162 Expanding Foam 170 Electrical component bulkhead 171 Hollow 172 Expanding Foam 180 Lid 200 Battery Pack 210 base plate 210B Bottom 212 Expanded Foam 290 Expanded Foam Layer

Claims

1. A base plate and a plurality of side walls extending from an upper surface of the base plate in a first direction perpendicular to the upper surface of the base plate; a plurality of battery devices disposed in a space defined by an upper surface of the base plate and a plurality of side walls; The battery pack, wherein the base plate comprises expanded foam.

2. The battery pack of claim 1 , wherein the base plate includes at least one hollow.

3. The battery pack of claim 1 or 2, wherein the base plate is manufactured by an extrusion process.

4. The battery pack according to claim 1 or 2, wherein the base plate is seamless.

5. The battery pack of claim 1 or 2, wherein at least one of the side walls comprises expanded foam.

6. The battery pack according to claim 1 , wherein the plurality of side walls include at least one hollow.

7. The battery pack of claim 1 or 2, wherein the side walls are manufactured by an extrusion process.

8. The battery pack according to claim 1 or 2, wherein the side walls are seamless.

9. a first partition wall interposed between the plurality of battery devices; a plurality of second partition walls perpendicular to the first partition walls and interposed between the plurality of battery devices; The battery pack according to claim 1 , wherein the first partition wall includes expanded foam.

10. The battery pack of claim 9 , wherein the first partition includes at least one hollow.

11. The battery pack of claim 9 , wherein at least one of the plurality of second partitions includes expanded foam.

12. The battery pack according to claim 9 , wherein the plurality of second partition walls include at least one hollow.

13. 3. The battery pack according to claim 1, wherein the expanded foam is one or more selected from the group consisting of polyurethane foam and silicone foam.

14. A base plate and a plurality of side walls extending from an upper surface of the base plate in a first direction perpendicular to the upper surface of the base plate; a plurality of battery devices disposed in a space defined by an upper surface of the base plate and a plurality of side walls; The battery pack further comprises a foam layer including foamed foam disposed on the lower surface of the base plate.

15. 15. The battery pack of claim 14, wherein the expanded foam is one or more selected from the group consisting of polyurethane foam and silicone foam.

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