Battery pack

Abstract

A battery pack according to the present invention comprises: a base plate; a plurality of side walls extending from the 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 provided by means of the upper surface of the base plate and the plurality of side walls, wherein the base plate includes a super absorbent resin absorbing a coolant, and thus can delay or prevent diffusion of a thermal runaway event to an adjacent battery device even if the thermal runaway event occurs in the battery device.

Description

battery pack

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

[0002] This disclosure claims the benefit of priority to Republic of Korea Patent Application No. 10-2023-0120251, filed September 11, 2023, the entire contents of which are incorporated by reference herein.

[0003]

[0004] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as the energy source for various wireless devices, such as cell phones, laptops, and cordless vacuum cleaners. Recently, improvements in energy density and economies of scale have dramatically reduced the manufacturing costs of electric-powered hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs). Furthermore, as BEVs' ranges have increased to match those of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0005] As secondary batteries become increasingly used in mobility, demand for their safety is increasing. Fires and other accidents involving secondary batteries used in mobility vehicles can endanger the lives of drivers, making research into technologies that enhance secondary battery safety essential.

[0006] The problem that the present invention seeks to solve is to provide a battery pack with improved safety.

[0007] To solve the above-described problem, according to some embodiments, a battery pack is provided. 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 an upper surface of the base plate; and a plurality of battery devices arranged in a space provided by the upper surface of the base plate and the plurality of side walls; wherein the base plate may include a superabsorbent resin that absorbs a coolant.

[0008] The above base plate may include at least one hollow portion.

[0009] The above base plate may be manufactured by an extrusion process.

[0010] The above base plate may be seamless.

[0011] At least one of the plurality of side walls may include a superabsorbent resin that absorbs a coolant.

[0012] The plurality of side walls may include at least one hollow space.

[0013] The above plurality of side walls may be manufactured by an extrusion process.

[0014] The above plurality of side walls may be seamless.

[0015] The battery pack further includes a first bulkhead interposed between the plurality of battery devices; and a plurality of second bulkheads perpendicular to the first bulkhead and interposed between the plurality of battery devices, wherein the first bulkhead may include a superabsorbent resin that absorbs a coolant.

[0016] The above first bulkhead may include at least one hollow space.

[0017] At least one of the plurality of second bulkheads may include a superabsorbent resin that absorbs a coolant.

[0018] The plurality of second bulkheads may include at least one hollow space.

[0019] The above-mentioned coolant is water, and the above-mentioned superabsorbent resin may be at least one selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, chitosan, and sodium carboxymethylcellulose.

[0020] 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 an upper surface of the base plate; and a plurality of battery devices arranged in a space provided by the upper surface of the base plate and the plurality of side walls; wherein a superabsorbent resin layer including a superabsorbent resin that absorbs a coolant may be arranged on a lower surface of the base plate.

[0021] The above-mentioned coolant is water, and the above-mentioned superabsorbent resin may be at least one selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, chitosan, and sodium carboxymethylcellulose.

[0022] The battery pack according to the present invention can delay or prevent the spread of a thermal runaway event to adjacent battery units even if a thermal runaway event occurs in the battery unit. Accordingly, the safety of the battery pack can be enhanced.

[0023] The effects of the present invention are not limited to those mentioned above. Those skilled in the art will readily understand and derive effects not mentioned herein.

[0024] FIG. 1 is an exploded perspective view illustrating a battery pack according to some embodiments.

[0025] Figure 2 is a cross-sectional view taken along the cutting line 1A-1A' of Figure 1.

[0026] Figure 3 is a cross-sectional view taken along the cutting line 1B-1B' of Figure 1.

[0027] FIGS. 4 to 7 are cross-sectional views illustrating battery packs according to some other embodiments.

[0028] FIG. 8 is an exploded perspective view illustrating a battery pack according to some other embodiments.

[0029] Fig. 9 is a cross-sectional view taken along the cutting line 8A-8A' of Fig. 8.

[0030] Fig. 10 is a cross-sectional view taken along the cutting line 8B-8B' of Fig. 8.

[0031] The terms or words used in this specification should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted in a meaning that conforms to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the meaning of the terms or words to explain his or her own invention in the best way.

[0032] It should be understood that the examples and drawings are merely examples of the present invention and do not represent all of the technical ideas of the present invention, and that various equivalents and modified examples may be substituted for them at the time of filing this application.

[0033] When describing the present invention, if it is determined that a detailed description of a known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

[0034] Since the drawings are provided to more completely explain the present invention to those skilled in the art, the shape, size, and number of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the shape, size, ratio, and number of each component in the drawings do not entirely reflect the actual shape, size, ratio, and number of each component.

[0035]

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0037]

[0038] [First embodiment]

[0039] FIG. 1 is an exploded perspective view illustrating a battery pack according to some embodiments.

[0040] Figure 2 is a cross-sectional view taken along the cutting line 1A-1A' of Figure 1.

[0041] Figure 3 is a cross-sectional view taken along the cutting line 1B-1B' of Figure 1.

[0042] Referring to FIGS. 1 to 3, a battery pack (100) may include a base plate (110), a plurality of side walls (120A, 120B, 130A, 130B), a plurality of battery devices (140), a first bulkhead (150), a plurality of second bulkheads (160), an electrical component bulkhead (170), and a lid (180). The battery pack (100) may be the final form of a battery system mounted on a mobility device, etc.

[0043] 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 the 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.

[0044] The base plate (110) can support a plurality of side walls (120A, 120B, 130A, 130B), a plurality of battery devices (140), a first bulkhead (150), a plurality of second bulkheads (160), and an electrical component bulkhead (170).

[0045] 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 the side surface of the base plate (110). The extending 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 square column, a square column, a circular column, an elliptical column, etc. The base plate (110) may include two or more hollows (111). The plurality of hollows (111) may be substantially parallel to each other. The shapes of each of the plurality of hollows (111) may be different from each other. The plurality of hollows (111) may all have the same shape. The volumes of each of the plurality of hollows (111) may be different from each other.

[0046] In some embodiments, the base plate (110) 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. As a non-limiting example, the material of the base plate (110) may be aluminum or an alloy including aluminum. The hollow portion (111) of the above-described base plate (110) may be formed by an extrusion process.

[0047] In some embodiments, the base plate (110) may be seamless. The base plate (110) may be seamless as it is manufactured by the extrusion process described above. In the present specification, "seamless" may mean that there is no joint or contact line in the hollow portion (111) of the base plate (110).

[0048] In this specification, “superabsorbent resin” means a resin capable of absorbing 100 to 3000 times its own weight of coolant.

[0049] In some embodiments, the base plate (110) may include a superabsorbent polymer (112) that absorbs a coolant. In some embodiments, the superabsorbent polymer (112) that absorbs a coolant may be disposed in at least one hollow space (111) of the base plate (110). The superabsorbent polymer (112) that absorbs a coolant may be disposed in at least one of a plurality of hollow spaces (111) of the base plate (110). The volume of the superabsorbent polymer (112) that absorbs a coolant may be substantially the same as the volume of the hollow space (111). The volume of the superabsorbent polymer (112) that absorbs a coolant may be smaller than the volume of the hollow space (111).

[0050] In some embodiments, the coolant may be water.

[0051] In some embodiments, the superabsorbent polymer (112) may be one or more selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, chitosan, and sodium carboxymethylcellulose.

[0052] Since the superabsorbent polymer (112) absorbing the coolant is included in the base plate, even if a thermal runaway event occurs in the battery device (140) described below, the coolant can delay or prevent the thermal runaway event from spreading to an adjacent battery device (140) by absorbing heat. The coolant can absorb heat and vaporize, and the coolant in a gaseous state can escape to the outside. Meanwhile, in a situation where a thermal runaway event does not occur in the battery device (140), the superabsorbent polymer (112) absorbing the coolant can function as an insulator.

[0053] Here, a thermal runaway event is a positive feedback loop in which temperature changes in multiple battery devices (140) further accelerate the temperature change. If a thermal runaway event occurs in multiple battery devices (140), the temperature rapidly increases, and a large amount of dust, gas, and flames may be emitted.

[0054] As a non-limiting example, the base plate (110) may include a cooling conduit (not shown). Since the cooling conduit is included in the base plate (110), even if a thermal runaway event occurs in the battery device (140), the coolant flowing in the cooling conduit can absorb the heat and prevent the thermal runaway event from spreading to adjacent battery devices (140).

[0055] A plurality of side walls (120A, 120B, 130A, 130B) may extend in the Z direction from the upper surface (110T) of the base plate. For convenience of description below, the side walls (120A) and (120B) extending in the X direction are referred to as first side walls (120A, 120B), and the side walls (130A) and (130B) extending in the Y direction are referred to as second side walls (130A, 130B). The first side walls (120A, 120B) and the second side walls (130A, 130B) may protect the plurality of battery devices (140), the first bulkhead (150), the plurality of second bulkheads (160), and the electrical component bulkhead (170).

[0056] The first side walls (120A, 120B) may be substantially parallel to the X direction and substantially perpendicular to the Y direction. The second side walls (130A, 130B) may be substantially parallel to the Y direction and substantially perpendicular to the X direction. The first side walls (120A, 120B) may be substantially perpendicular to the second side walls (130A, 130B). The first side walls (120A, 120B) may extend in the Z direction from a long side region of the upper surface (110T) of the base plate. The second side walls (130A, 130B) may extend in the Z direction from a short side region of the upper surface (110T) of the base plate.

[0057] 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 a separate hollow (not shown) that is in communication with the hollow (121A) and exposed to the outside of the first side wall (120A). The hollow (121A) may extend in the X direction from the side surface of the first side wall (120A). The extending direction of the hollow (121A) may be substantially perpendicular to the Y direction. As a non-limiting example, the shape of the hollow (121A) may be a rounded square column, a square column, a circular column, or an elliptical column. The first side wall (120A) may include two or more hollows (121A). The plurality of hollows (121A) may be substantially parallel to each other. The shapes of each of the plurality of hollows (121A) may be different from each other. The plurality of hollows (121A) may all have the same shape. The volumes of each of the plurality of hollows (121A) may be different from each other. In some embodiments, the first side wall (120B) may include at least one hollow (121B). Since the hollow (121B) may be substantially the same as the hollow (121A), a redundant description thereof will be omitted.

[0058] In some embodiments, the second side wall (130A) may include at least one hollow (131A). The second side wall (130A) may include a separate hollow (not shown) that is in communication with the hollow (131A) and exposed to the exterior of the second side wall (130A). Accordingly, the hollow (131A) may be exposed to the exterior of the second side wall (130A). The hollow (131A) may extend in the Y direction from the side surface of the second side wall (130A). The extending 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 square column, a square column, a circular column, or an elliptical column. The second side wall (130A) may include two or more hollows (131A). The plurality of hollows (131A) may be substantially parallel to each other. The shapes of each of the plurality of hollows (131A) may be different from each other. The plurality of hollows (131A) may all have the same shape. The volumes of each of the plurality of hollows (131A) may be different from each other. In some embodiments, the second side wall (130B) may include at least one hollow (131B). Since the hollow (131B) may be substantially the same as the hollow (131A), a redundant description thereof will be omitted.

[0059] In some embodiments, the first side walls (120A, 120B) and the second side walls (130A, 130B) 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. As a non-limiting example, the material of the first side walls (120A, 120B) and the second side walls (130A, 130B) may be aluminum or an alloy including aluminum. The hollow portions (131A, 131B) of the first side walls (120A, 120B) and the second side walls (130A, 130B) described above may be formed by an extrusion process.

[0060] 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 as they are manufactured by the extrusion process described above.

[0061] As a non-limiting example, the first side walls (120A, 120B) and the second side walls (130A, 130B) may include cooling channels (not shown). Since the cooling channels are included 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 in the cooling channels can absorb the heat and prevent the thermal runaway event from spreading to the adjacent battery device (140).

[0062] In some exemplary embodiments, the second side wall (130B) may include a plurality of exhaust holes (not shown). The plurality of exhaust holes may be configured to provide a path for exhausting gases, heat, and vaporized coolant within the battery pack (100).

[0063] A plurality of battery devices (140) may be configured to store energy. As a non-limiting example, each of the plurality of battery devices (140) may be a cell unit including a plurality of battery cells. Each of the plurality of battery devices (140) may not include a module frame. The assembly method of mounting the cell units into a battery pack may be referred to as cell-to-pack. A battery pack assembled in a cell-to-pack manner may be referred to as a module-less type battery pack.

[0064] 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 on which the cell unit is mounted. An assembly method in which the cell unit is mounted on a module frame having at least one open side and the module frame is mounted on a battery pack is also referred to as a cell-to-pack.

[0065] Each of the plurality of battery cells may be a secondary battery. Each of the plurality of battery cells may be a lithium secondary battery. Each of the plurality of battery cells may be any one of a lithium ion battery, a lithium ion polymer battery, a lithium metal battery, and a lithium polymer battery.

[0066] The shape of each of the plurality of battery cells may be any one of cylindrical, square, and pouch-shaped. The shape of the battery cell refers to the shape of the battery case.

[0067] The first bulkhead (150) and the plurality of second bulkheads (160) can isolate the plurality of battery devices (140) and the plurality of electrical components (not shown) from each other. Accordingly, the first bulkhead (150) and the plurality of second bulkheads (160) can protect the plurality of battery devices (140) and the plurality of electrical components (not shown) while preventing short circuits therebetween.

[0068] A first bulkhead (150) may be interposed between a plurality of battery devices (140). The first bulkhead (150) may extend in the X direction. The first bulkhead (150) may extend between a second side wall (130A) and an electrical component bulkhead (170). The first bulkhead (150) may contact each of the second side wall (130A) and the electrical component bulkhead (170). Each of the plurality of second bulkheads (160) may be interposed between a plurality of battery devices (140). Each of the plurality of second bulkheads (160) may extend in the Y direction. Each of the plurality of second bulkheads (160) may extend between the first bulkhead (150) and one of the first side walls (120A, 120B). Each of the plurality of second bulkheads (160) can be in contact with each of the first bulkhead (150) and one of the first side walls (120A, 120B).

[0069] In some embodiments, the first bulkhead (150) may include at least one hollow (151). The first bulkhead (150) may include a separate hollow (not shown) that is in communication with the hollow (151) and exposed to the outside of the first bulkhead (150). Accordingly, the hollow (151) may be exposed to the outside of the first bulkhead (150). The hollow (151) may extend in the X direction from the side surface of the first bulkhead (150). The extending 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 square column, a square column, a circular column, or an elliptical column. The first bulkhead (150) may include two or more hollows (151). The plurality of hollows (151) may be substantially parallel to each other. The shapes of each of the plurality of hollows (151) may be different from each other. The plurality of hollows (151) may all have the same shape. The volumes of each of the plurality of hollows (151) may be different from each other.

[0070] In some embodiments, each of the plurality of second bulkheads (160) may include at least one hollow (161). Each of the plurality of second bulkheads (160) may include a separate hollow (not shown) that is in communication with the hollow (161) and exposed to the exterior of each of the plurality of second bulkheads (160). Accordingly, the hollow (161) may be exposed to the exterior of the second bulkhead (160). The hollow (161) may extend in the Y direction from a side surface of each of the plurality of second bulkheads (160). The extending 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 square column, a square column, a circular column, or an elliptical column. Each of the plurality of second bulkheads (160) may include two or more hollows (161). The plurality of hollows (161) may be substantially parallel to each other. The shapes of each of the plurality of hollows (161) may be different from each other. The plurality of hollows (161) may all have the same shape. The volumes of each of the plurality of hollows (161) may be different from each other.

[0071] In some embodiments, the first bulkhead (150) and the plurality of second bulkheads (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. As a non-limiting example, the material of the first bulkhead (150) and the plurality of second bulkheads (160) may be aluminum or an alloy including aluminum. The hollow portions (151, 161) of the first bulkhead (150) and the plurality of second bulkheads (160) described above may be formed by an extrusion process.

[0072] In some embodiments, the first bulkhead (150) and the plurality of second bulkheads (160) may be seamless. The first bulkhead (150) and the plurality of second bulkheads (160) may be seamless as they are manufactured by the extrusion process described above.

[0073] The electrical component bulkhead (170) may extend in the Y direction. The electrical component bulkhead (170) may extend between the first side walls (120A, 120B). The electrical component bulkhead (170) may contact each of the first side walls (120A, 120B). The electrical component bulkhead (170) may isolate a plurality of electrical components (not shown) from a plurality of battery devices (140). The electrical component bulkhead (170) may be interposed between the plurality of electrical components (not shown) and the plurality of battery devices (140).

[0074] In some embodiments, the electrical component bulkhead (170) may include at least one hollow (171). The electrical component bulkhead (170) may include a separate hollow (not shown) that is in communication with the hollow (171) and exposed to the outside of the electrical component bulkhead (170). Accordingly, the hollow (171) may be exposed to the outside of the electrical component bulkhead (170). The hollow (171) may extend in the Y direction from the side surface of the electrical component bulkhead (170). The extending 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 square column, a square column, a circular column, or an elliptical column. The electrical component bulkhead (170) may include two or more hollows (171). The plurality of hollows (171) may be substantially parallel to each other. The shapes of each of the plurality of hollows (171) may be different from each other. The plurality of hollows (171) may all have the same shape. The volumes of each of the plurality of hollows (171) may be different from each other.

[0075] In some embodiments, the electrical component bulkhead (170) may be manufactured by an extrusion process. Non-limiting examples thereof include direct extrusion or indirect extrusion. Non-limiting examples thereof include the material of the electrical component bulkhead (170) may be aluminum or an alloy containing aluminum. The hollow space (171) of the electrical component bulkhead (170) described above may be formed by an extrusion process.

[0076] In some embodiments, the bulkhead (170) may be seamless. The bulkhead (170) may be seamless as it is manufactured by the extrusion process described above.

[0077] As a non-limiting example, the battery pack (100) may include a plurality of electrical components (not shown). The plurality of electrical components (not shown) may be arranged in a space provided by the upper surface (110T) of the base plate, the first side walls (120A, 120B), the electrical component partition wall (170), and the second side wall (130B). The plurality of electrical components (not shown) may include any electronic components necessary to operate the battery pack.

[0078] 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 bulkhead (150), a plurality of second bulkheads (160), an electrical component bulkhead (170), and a plurality of electrical components (not shown). The shape of the lid (180) can be a flat plate.

[0079]

[0080] [Second embodiment]

[0081] FIG. 4 is a cross-sectional view illustrating a battery pack (100') according to some other embodiments.

[0082] For the second embodiment, only the differences from the first embodiment will be explained.

[0083] Referring to FIG. 4, in some embodiments, the first side walls (120A, 120B) may include a superabsorbent resin (122A, 122B) that absorbs a coolant. In some embodiments, the superabsorbent resin (122A, 122B) that absorbs a coolant may be disposed in at least one hollow space (121A, 121B) of the first side walls (120A, 120B). The volume of the superabsorbent resin (122A, 122B) that absorbs a coolant may be substantially the same as the volume of the hollow space (121A, 121B). The volume of the superabsorbent resin (122A, 122B) that absorbs a coolant may be smaller than the volume of the hollow space (121A, 121B).

[0084]

[0085] [Third embodiment]

[0086] FIG. 5 is a cross-sectional view illustrating a battery pack (100'') according to some other embodiments.

[0087] For the third embodiment, only the differences from the first embodiment will be explained.

[0088] Referring to FIG. 5, in some embodiments, the second side walls (130A, 130B) may include a superabsorbent resin (132A, 132B) that absorbs a coolant. In some embodiments, the superabsorbent resin (132A, 132B) that absorbs a coolant may be disposed in at least one hollow space (131A, 131B) of the second side walls (130A, 130B). The volume of the superabsorbent resin (132A, 132B) that absorbs a coolant may be substantially the same as the volume of the hollow space (131A, 131B). The volume of the superabsorbent resin (132A, 132B) that absorbs a coolant may be smaller than the volume of the hollow space (131A, 131B).

[0089]

[0090] [Fourth embodiment]

[0091] FIG. 6 is a cross-sectional view illustrating a battery pack (100''') according to some other embodiments.

[0092] For the fourth embodiment, only the differences from the second embodiment will be explained.

[0093] Referring to FIG. 6, in some embodiments, the first bulkhead (150) may include a superabsorbent resin (152) that absorbs a coolant. In some embodiments, the superabsorbent resin (152) that absorbs a coolant may be disposed in at least one hollow space (151) of the first bulkhead (150). The volume of the superabsorbent resin (152) that absorbs a coolant may be substantially the same as the volume of the hollow space (151). The volume of the superabsorbent resin (152) that absorbs a coolant may be smaller than the volume of the hollow space (151).

[0094]

[0095] [Fifth embodiment]

[0096] FIG. 7 is a cross-sectional view illustrating a battery pack (100'''') according to some other embodiments.

[0097] For the fifth embodiment, only the differences from the third embodiment will be explained.

[0098] Referring to FIG. 7, in some embodiments, the plurality of second bulkheads (160) may include a superabsorbent resin (162) that absorbs a coolant. In some embodiments, the superabsorbent resin (162) that absorbs a coolant may be disposed in at least one hollow space (161) of the plurality of second bulkheads (160). The volume of the superabsorbent resin (162) that absorbs a coolant may be substantially the same as the volume of the hollow space (161). The volume of the superabsorbent resin (162) that absorbs a coolant may be smaller than the volume of the hollow space (161).

[0099] In some embodiments, the electrical component bulkhead (170) may include a superabsorbent polymer (172) that absorbs a coolant. In some embodiments, the superabsorbent polymer (172) that absorbs a coolant may be disposed in at least one hollow space (171) of the electrical component bulkhead (170). The volume of the superabsorbent polymer (172) that absorbs a coolant may be substantially the same as the volume of the hollow space (171). The volume of the superabsorbent polymer (172) that absorbs a coolant may be smaller than the volume of the hollow space (171).

[0100]

[0101] [6th embodiment]

[0102] FIG. 8 is an exploded perspective view illustrating a battery pack (200) according to some other embodiments.

[0103] Fig. 9 is a cross-sectional view taken along the cutting line 8A-8A' of Fig. 8.

[0104] Fig. 10 is a cross-sectional view taken along the cutting line 8B-8B' of Fig. 8.

[0105] For the sixth embodiment, only the differences from the first embodiment will be explained.

[0106] In some embodiments, a superabsorbent resin layer (290) including a superabsorbent resin that absorbs a coolant may be disposed on the lower surface (210B) of the base plate. In this case, the base plate (210) may not include a superabsorbent resin (212) that absorbs a coolant.

[0107]

[0108] The above description is intended solely to illustrate the present invention. The scope of the present invention should be interpreted in accordance with the claims, and all technical ideas within the scope equivalent or equivalent thereto should be construed as being included within the scope of the present invention.

Claims

1. Base plate; A plurality of side walls extending from the 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 provided by the upper surface of the base plate and a plurality of side walls; A battery pack characterized in that the base plate includes a superabsorbent resin that absorbs a coolant.

2. In paragraph 1, A battery pack, characterized in that the base plate includes at least one hollow portion.

3. In paragraph 1, A battery pack characterized in that the above base plate is manufactured by an extrusion process.

4. In paragraph 1, A battery pack characterized in that the base plate is seamless.

5. In paragraph 1, A battery pack characterized in that at least one of the plurality of side walls comprises a superabsorbent resin that absorbs a coolant.

6. In paragraph 1, A battery pack, wherein the plurality of side walls include at least one hollow portion.

7. In paragraph 1, A battery pack characterized in that the plurality of side walls are manufactured by an extrusion process.

8. In paragraph 1, A battery pack characterized in that the plurality of side walls are seamless.

9. In paragraph 1, A first bulkhead interposed between the plurality of battery devices; and In addition, a plurality of second bulkheads are included that are perpendicular to the first bulkhead and interposed between the plurality of battery devices, A battery pack, characterized in that the first bulkhead comprises a superabsorbent resin that absorbs a coolant.

10. In paragraph 9, A battery pack, characterized in that the first bulkhead includes at least one hollow space.

11. In paragraph 9, A battery pack characterized in that at least one of the plurality of second bulkheads comprises a superabsorbent resin that absorbs a coolant.

12. In paragraph 9, A battery pack, characterized in that the plurality of second bulkheads include at least one hollow space.

13. In paragraph 1, The above coolant is water, A battery pack characterized in that the above superabsorbent resin is at least one selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, chitosan, and sodium carboxymethyl cellulose.

14. Base plate; A plurality of side walls extending from the 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 provided by the upper surface of the base plate and a plurality of side walls; A battery pack characterized in that a superabsorbent resin layer including a superabsorbent resin that absorbs a coolant is disposed on the lower surface of the base plate.

15. In paragraph 14, The above coolant is water, A battery pack characterized in that the above superabsorbent resin is at least one selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, chitosan, and sodium carboxymethyl cellulose.

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