Battery pack

Abstract

Disclosed herein is a battery pack including: a base plate; the side walls extend from the upper surface of the bottom plate in the first direction perpendicular to the upper surface of the bottom plate; and a plurality of battery devices disposed in a space provided by the upper surface of the bottom plate and the plurality of side walls, in which the bottom plate contains a highly absorbent resin having a coolant absorbed therein such that when a thermal runaway event occurs in the battery device, propagation of the thermal runaway event to an adjacent battery device may be delayed or prevented.

Description

Technical Field

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

[0002] This application claims the priority of Korean Patent Application No. 10-2023-0120251, filed on September 11, 2023, and the entire contents of the Korean Patent Application No. 10-2023-0120251 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 wireless devices such as cellular phones, laptop computers, and cordless vacuum cleaners. In recent years, with the increase in energy density and the significant reduction in manufacturing costs of hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs) due to economies of scale, and the increase in the driving range of BEVs to the same level as that of fuel vehicles, the main use of secondary batteries has shifted from mobile devices to mobility.

[0004] As secondary batteries are used in mobility, the demand for their safety is increasing. In the case of an accident (e.g., fire) occurring in a secondary battery used in mobility, the life of the driver may be threatened, and thus research on technologies for improving the safety of secondary batteries is essential. Summary of the Invention

[0005] Technical Problem

[0006] The problem to be solved by the present disclosure is to provide a battery pack with increased safety.

[0007] Technical Solution

[0008] To solve the above problems, according to some embodiments, there is provided a battery pack. The battery pack may include: a bottom plate; a plurality of side walls extending from an upper surface of the bottom plate in a first direction perpendicular to the upper surface of the bottom plate; and a plurality of battery devices disposed in a space provided by the upper surface of the bottom plate and the plurality of side walls, wherein the bottom plate may include a highly absorbent resin absorbing a coolant.

[0009] The bottom plate may include at least one hollow portion.

[0010] The bottom plate may be manufactured by an extrusion process.

[0011] The bottom plate may be seamless.

[0012] At least one of the plurality of side walls may include a highly absorbent resin absorbing a coolant.

[0013] The plurality of side walls may include at least one hollow portion.

[0014] Multiple side walls can be manufactured by an extrusion process.

[0015] The multiple side walls can be seamless.

[0016] The battery pack further includes: a first partition wall interposed between multiple battery devices; and multiple second partition walls perpendicular to the first partition wall and interposed between the multiple battery devices, wherein the first partition wall can include a superabsorbent resin absorbing a coolant.

[0017] The first partition wall can include at least one hollow portion.

[0018] At least one of the multiple second partition walls can include a superabsorbent resin absorbing a coolant.

[0019] The multiple second partition walls can include at least one hollow portion.

[0020] The coolant is water, and the superabsorbent resin can be 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.

[0021] The battery pack includes: a bottom plate; multiple side walls extending from an upper surface of the bottom plate in a first direction perpendicular to the upper surface of the bottom plate; multiple battery devices disposed in a space provided by the upper surface of the bottom plate and the multiple side walls; and a superabsorbent resin layer disposed on a lower surface of the bottom plate, wherein the superabsorbent resin layer includes a superabsorbent resin absorbing a coolant.

[0022] The coolant is water, and the superabsorbent resin can be 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.

[0023] Advantageous Effects

[0024] Even if a thermal runaway event occurs in a battery device, the battery pack according to the present disclosure can delay or prevent the thermal runaway event from spreading to adjacent battery devices. Therefore, the safety of the battery pack can be enhanced.

[0025] The technical effects of the present disclosure are not limited to the above-mentioned technical effects. Those of ordinary skill in the art to which the present disclosure pertains will be able to clearly derive and understand technical effects not mentioned herein. Description of the Drawings

[0026] Figure 1 is an exploded perspective view showing a battery pack according to some embodiments.

[0027] Figure 2 is a cross-sectional view taken along Figure 1 the cutting line 1A-1A'.

[0028] Figure 3 is a cross-sectional view taken along Figure 1 the cutting line 1B-1B′.

[0029] Figures 4 to 7 is a cross-sectional view showing a battery pack according to some other embodiments.

[0030] Figure 8 is an exploded perspective view showing a battery pack according to some other embodiments.

[0031] Figure 9 is a cross-sectional view taken along Figure 8 the cutting line 8A-8A'.

[0032] Figure 10 is a cross-sectional view taken along Figure 8 the cutting line 8B-8B'. DETAILED DESCRIPTION

[0033] The terms and vocabulary used in this specification should not be construed in their ordinary or dictionary meanings, but rather the meanings of the terms and vocabulary should be defined according to the technical concept of the present disclosure, in a manner that the inventor believes best describes the principles of the disclosure.

[0034] It should be understood that the examples and drawings are merely exemplary descriptions of the present disclosure, and are not all examples of the technical concept of the present disclosure, and there may be various equivalents and modifications that can replace them when the present disclosure is submitted.

[0035] When describing the present disclosure, detailed descriptions of known configurations or features are omitted when it is considered that such detailed descriptions would obscure the essence of the present disclosure.

[0036] The drawings are provided to more fully illustrate the present disclosure to those of ordinary skill in the art, and for clarity, the shapes, sizes, and numbers of the components in the drawings may be enlarged, omitted, or shown schematically. Therefore, the shapes, sizes, ratios, and numbers of the components in the drawings do not necessarily reflect the actual shapes, sizes, ratios, and numbers of each component.

[0037] Hereinafter, examples of the present disclosure will be described in detail with reference to the drawings.

[0038] [First Embodiment]

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

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

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

[0042] Referring to Figures 1 to 3 , the battery pack 100 may include a bottom plate 110, 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, an electronic component partition wall 170, and a cover 180. The battery pack 100 may be the final form of a battery system installed on a vehicle or the like.

[0043] Hereinafter, two directions substantially parallel to the upper surface 110T of the bottom plate 110 are respectively defined as the X direction and the Y direction, and a direction substantially perpendicular to the upper surface 110T of the bottom 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 bottom plate 110 may 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 electronic component partition wall 170.

[0045] In some embodiments, the bottom plate 110 may include at least one hollow portion 111. The hollow portion 111 may be exposed to the outside of the bottom plate 110. The hollow portion 111 may extend in the X direction from the side surface of the bottom plate 110. The extending direction of the hollow portion 111 may be substantially perpendicular to the Y direction. As a non-limiting example, the shape of the hollow portion 111 may be a rounded square column, a rectangular column, a circular column, or an oval column. The bottom plate 110 may include more than two hollow portions 111. The plurality of hollow portions 111 may be substantially parallel to each other. Each of the plurality of hollow portions 111 may have a different shape. The plurality of hollow portions 111 may all have the same shape. The volume of each of the plurality of hollow portions 111 may be different.

[0046] In some embodiments, the bottom 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 bottom plate 110 may be aluminum or an alloy containing aluminum. The hollow portion 111 of the bottom plate 110 as described above may be formed by the extrusion process.

[0047] In some embodiments, the bottom plate 110 may be seamless. Since the bottom plate 110 is manufactured by the extrusion process as described above, the bottom plate 110 may be seamless. As used herein, "seamless" may mean that the hollow portion 111 of the bottom plate 110 does not have a joining member or a bonding line.

[0048] As used herein, "superabsorbent resin" refers to a resin that can absorb 100 to 3000 times its own weight of coolant.

[0049] In some embodiments, the bottom plate 110 may include a superabsorbent resin 112 that has absorbed coolant. In some embodiments, the superabsorbent resin 112 that has absorbed coolant may be disposed in at least one hollow portion 111 of the bottom plate 110. The superabsorbent resin 112 that has absorbed coolant may be disposed in at least one of a plurality of hollow portions 111 of the bottom plate 110. The volume of the superabsorbent resin 112 that has absorbed coolant may be substantially equal to the volume of the hollow portion 111. The volume of the superabsorbent resin 112 that has absorbed coolant may be less than the volume of the hollow portion 111.

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

[0051] In some embodiments, the superabsorbent resin 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 bottom plate 112 includes a superabsorbent resin that has absorbed coolant, even if a thermal runaway event occurs in the battery device 140, the coolant can absorb heat, thereby delaying or preventing the thermal runaway event from spreading to adjacent battery devices 140. The coolant can absorb heat and evaporate, and the gaseous coolant can escape to the outside. On the other hand, in the absence of a thermal runaway event in the battery device 140, the superabsorbent resin 112 that has absorbed coolant can be used as an insulator.

[0053] Here, a thermal runaway event is a positive feedback in which a temperature change in a plurality of battery devices 140 causes the temperature change to accelerate further. When a thermal runaway event occurs in a plurality of battery devices 140, the temperatures of the plurality of battery devices 140 rapidly increase and a large amount of dust, gas, and flame may be emitted.

[0054] As a non-limiting example, the bottom plate 110 may include a cooling flow path (not shown). By including a cooling flow path in the bottom plate 110, even if a thermal runaway event occurs in the battery device 140, the coolant flowing in the cooling flow path can absorb 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 bottom plate. For the convenience of the description herein, the side walls 120A and 120B extending in the X direction are referred to as the first side walls 120A, 120B, and the side walls 130A and 130B extending in the Y direction are referred to as the second side walls 130A, 130B. The first side walls 120A, 120B and the second side walls 130A, 130B may protect a plurality of battery devices 140, a first partition wall 150, a plurality of second partition walls 160, and an electronic component partition wall 170.

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

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

[0058] In some embodiments, the second sidewall 130A may include at least one hollow portion 131A. The second sidewall 130A may include a separate hollow portion (not shown) that communicates with the hollow portion 131A and is exposed to the outside of the second sidewall 130A. Accordingly, the hollow portion 131A may be exposed to the outside of the second sidewall 130A. The hollow portion 131A may extend in the Y direction along the side surface of the second sidewall 130A. The extending direction of the hollow portion 131A may be substantially perpendicular to the X direction. As a non-limiting example, the shape of the hollow portion 131A may be a rounded square column, a rectangular column, a circular column, or an oval column. The second sidewall 130A may include two or more hollow portions 131A. The plurality of hollow portions 131A may be substantially parallel to each other. Each of the plurality of hollow portions 131A may have a different shape. The plurality of hollow portions 131A may all have the same shape. The volume of each of the plurality of hollow portions 131A may be different. In some embodiments, the second sidewall 130B may include at least one hollow portion 131B. The hollow portion 131B may be substantially the same as the hollow portion 131A, and thus redundant description thereof is omitted.

[0059] In some embodiments, the first sidewalls 120A, 120B and the second sidewalls 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 materials of the first sidewalls 120A, 120B and the second sidewalls 130A, 130B may be aluminum or an alloy containing aluminum. The hollow portions 131A, 131B of the first sidewalls 120A, 120B and the second sidewalls 130A, 130B as described above may be formed by the extrusion process.

[0060] In some embodiments, the first sidewalls 120A, 120B and the second sidewalls 130A, 130B may be seamless. Since the first sidewalls 120A, 120B and the second sidewalls 130A, 130B are manufactured by the extrusion process as described above, the first sidewalls 120A, 120B and the second sidewalls 130A, 130B may be seamless.

[0061] As a non-limiting example, the first sidewalls 120A, 120B and the second sidewalls 130A, 130B may include cooling flow paths (not shown). By including the cooling flow paths in the first sidewalls 120A, 120B and the second sidewalls 130A, 130B, even if a thermal runaway event occurs in the battery device 140, the coolant flowing in the cooling flow paths may absorb heat and prevent the thermal runaway event from spreading to adjacent battery devices 140.

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

[0063] The 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 battery 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 battery cell unit into the 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 cell to pack 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 battery cell unit (including a plurality of battery cells) and a module frame in which the battery cell unit is mounted. The assembly method of mounting the battery cell unit into the module frame having at least one open side and mounting the module frame into the battery pack is sometimes referred to as 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, prismatic, and pouch type. The shape of the battery cell refers to the shape of the battery case.

[0067] The first partition wall 150 and the plurality of second partition walls 160 may isolate the plurality of battery devices 140 and the plurality of electronic components (not shown) from each other. Thus, the first partition wall 150 and the plurality of second partition walls 160 may protect the plurality of battery devices 140 and the plurality of electronic components (not shown) while preventing short circuits therebetween.

[0068] The first partition wall 150 may be interposed between a 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 electronic component partition wall 170. The first partition wall 150 may abut each of the second side wall 130A and the electronic 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 respectively abut the first partition wall 150 and one of the first side walls 120A, 120B.

[0069] In some embodiments, the first partition wall 150 may include at least one hollow portion 151. The first partition wall 150 may include a separate hollow portion (not shown) that communicates with the hollow portion 151 and is exposed to the outside of the first partition wall 150. Thus, the hollow portion 151 may be exposed to the outside of the first partition wall 150. The hollow portion 151 may extend in the X direction along the side surface of the first partition wall 150. The extending direction of the hollow portion 151 may be substantially perpendicular to the Y direction. As a non-limiting example, the shape of the hollow portion 151 may be a rounded square column, a rectangular column, a circular column, or an oval column. The first partition wall 150 may include more than two hollow portions 151. The plurality of hollow portions 151 may be substantially parallel to each other. Each of the plurality of hollow portions 151 may have a different shape. The plurality of hollow portions 151 may all have the same shape. The volume of each of the plurality of hollow portions 151 may be different.

[0070] In some embodiments, each of the plurality of second partition walls 160 may include at least one hollow portion 161. Each of the plurality of second partition walls 160 may include a separate hollow portion (not shown) that communicates with the hollow portion 161 and is exposed to the outside of each of the plurality of second partition walls 160. Thus, the hollow portion 161 may be exposed to the outside of the second partition wall 160. The hollow portion 161 may extend in the Y direction along the side surface of each of the plurality of second partition walls 160. The extending direction of the hollow portion 161 may be substantially perpendicular to the X direction. As a non-limiting example, the shape of the hollow portion 161 may be a rounded square column, a rectangular column, a circular column, or an oval column. Each of the plurality of second partition walls 160 may include more than two hollow portions 161. The plurality of hollow portions 161 may be substantially parallel to each other. Each of the plurality of hollow portions 161 may have a different shape. The plurality of hollow portions 161 may all have the same shape. The volume of each of the plurality of hollow portions 161 may be different.

[0071] 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. As a non-limiting example, the materials of the first partition wall 150 and the plurality of second partition walls 160 may be aluminum or an alloy containing aluminum. The hollow portions 151 and 161 of the first partition wall 150 and the plurality of second partition walls 160 may be formed by an extrusion process.

[0072] In some embodiments, the first partition wall 150 and the plurality of second partition walls 160 may be seamless. Since the first partition wall 150 and the plurality of second partition walls 160 are manufactured by the extrusion process as described above, the first partition wall 150 and the plurality of second partition walls 160 may be seamless.

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

[0074] In some embodiments, the electronic component partition wall 170 may include at least one hollow portion 171. The electronic component partition wall 170 may include a separate hollow portion (not shown) that communicates with the hollow portion 171 and is exposed to the outside of the electronic component partition wall 170. Accordingly, the hollow portion 171 may be exposed to the outside of the electronic component partition wall 170. The hollow portion 171 may extend in the Y direction from the side surface of the electronic component partition wall 170. The extending direction of the hollow portion 171 may be substantially perpendicular to the X direction. As a non-limiting example, the shape of the hollow portion 171 may be a rounded square column, a rectangular column, a circular column, or an oval column. The electronic component partition wall 170 may include more than two hollow portions 171. The plurality of hollow portions 171 may be substantially parallel to each other. Each of the plurality of hollow portions 171 may have a different shape. The plurality of hollow portions 171 may all have the same shape. The volume of each of the plurality of hollow portions 171 may be different.

[0075] In some embodiments, the electronic component partition wall 170 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 electronic component partition wall 170 may be aluminum or an alloy containing aluminum. The hollow portion 171 of the electronic component partition wall 170 may be formed by an extrusion process.

[0076] In some embodiments, the electronic component partition wall 170 may be seamless. Since the electronic component partition wall 170 is manufactured by the extrusion process as described above, the electronic component partition wall 170 may be seamless.

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

[0078] The cover 180 may be joined to the first side walls 120A, 120B and the second side walls 130A, 130B. As a non-limiting example, the cover 180 may be fixed to the first side walls 120A, 120B and the second side walls 130A, 130B by mechanical joining devices such as bolts. The cover 180 may cover the plurality of battery devices 140, the first partition wall 150, the plurality of second partition walls 160, the electronic component partition wall 170, and the plurality of electronic components (not shown). The shape of the cover 180 may be flat.

[0079] [Second Embodiment]

[0080] Figure 4 is a cross-sectional view showing a battery pack 100' according to some other embodiments.

[0081] For the second embodiment, only the differences from the first embodiment will be described.

[0082] Reference Figure 4 , in some embodiments, the first side walls 120A, 120B may include highly absorbent resins 122A, 122B that have absorbed a coolant. In some embodiments, the highly absorbent resins 122A, 122B that have absorbed a coolant may be disposed in at least one of the hollow portions 121A, 121B of the first side walls 120A, 120B. The volume of the highly absorbent resins 122A, 122B that have absorbed a coolant may be substantially the same as the volume of the hollow portions 121A, 121B. The volume of the highly absorbent resins 122A, 122B that have absorbed a coolant may be less than the volume of the hollow portions 121A, 121B.

[0083] [Third Embodiment]

[0084] Figure 5 is a cross-sectional view showing a battery pack 100" according to some other embodiments.

[0085] For the third embodiment, only the differences from the first embodiment will be described.

[0086] ReferenceFigure 5 , in some embodiments, the second sidewalls 130A, 130B may include highly absorbent resins 132A, 132B that have absorbed a coolant. In some embodiments, the highly absorbent resins 132A, 132B that have absorbed a coolant may be disposed in at least one of the hollow portions 131A, 131B of the second sidewalls 130A, 130B. The volume of the highly absorbent resins 132A, 132B that have absorbed a coolant may be substantially the same as the volume of the hollow portions 131A, 131B. The volume of the highly absorbent resins 132A, 132B that have absorbed a coolant may be less than the volume of the hollow portions 131A, 131B.

[0087] [Fourth Embodiment]

[0088] Figure 6 is a cross-sectional view showing a battery pack 100″′ according to some other embodiments.

[0089] For the fourth embodiment, only the differences from the second embodiment will be described.

[0090] Reference Figure 6 , in some embodiments, the first partition wall 150 may contain a highly absorbent resin 152 that has absorbed a coolant. In some embodiments, the highly absorbent resin 152 that has absorbed a coolant may be disposed in at least one hollow portion 151 of the first partition wall 150. The volume of the highly absorbent resin 152 that has absorbed a coolant may be substantially the same as the volume of the hollow portion 151. The volume of the highly absorbent resin 152 that has absorbed a coolant may be less than the volume of the hollow portion 151.

[0091] [Fifth Embodiment]

[0092] Figure 7 is a cross-sectional view showing a battery pack 100″″ according to some other embodiments.

[0093] For the fifth embodiment, only the differences from the third embodiment will be described.

[0094] Reference Figure 7 , in some embodiments, the plurality of second partition walls 160 may include highly absorbent resins 162 that have absorbed a coolant. In some embodiments, the highly absorbent resins 162 that have absorbed a coolant may be disposed in at least one hollow portion 161 of the plurality of second partition walls 160. The volume of the highly absorbent resins 162 that have absorbed a coolant may be substantially the same as the volume of the hollow portion 161. The volume of the highly absorbent resins 162 that have absorbed a coolant may be less than the volume of the hollow portion 161.

[0095] In some embodiments, the electronic component partition wall 170 may include a highly absorbent resin 172 that has absorbed a coolant. In some embodiments, the highly absorbent resin 172 that has absorbed the coolant may be disposed in at least one hollow portion 171 of the electronic component partition wall 170. The volume of the highly absorbent resin 172 that has absorbed the coolant may be substantially equal to the volume of the hollow portion 171. The volume of the highly absorbent resin 172 that has absorbed the coolant may be less than the volume of the hollow portion 171.

[0096] [Sixth Embodiment]

[0097] Figure 8 is an exploded perspective view showing a battery pack 200 according to some other embodiments.

[0098] Figure 9 is along Figure 8 The cross-sectional view taken along the cutting line 8A-8A'.

[0099] Figure 10 is along Figure 8 The cross-sectional view taken along the cutting line 8B-8B'.

[0100] For the sixth embodiment, only the differences from the first embodiment will be described.

[0101] In some embodiments, a highly absorbent resin layer 290 containing a highly absorbent resin that has absorbed a coolant may be disposed on the lower surface 210B of the bottom plate. In this case, the bottom plate 210 may not include a highly absorbent resin 212 that has absorbed the coolant.

[0102] The above description is only intended to illustrate the present disclosure by way of example. The scope of the rights of the present disclosure should be construed according to the claims, and all technical ideas within the same or equivalent scope should be construed as being included within the scope of the claims of the present disclosure.

Claims

1. A battery pack comprising: Base plate; a plurality of side walls extending from the upper surface of the bottom plate along a first direction perpendicular to the upper surface of the bottom plate; as well as a plurality of battery devices disposed in a space provided by the upper surface of the bottom plate and the plurality of side walls; The bottom plate includes a high-absorbency resin having a coolant absorbed therein.

2. The battery pack according to claim 1, wherein: The bottom plate includes at least one hollow portion.

3. The battery pack according to claim 1, wherein: The base plate is manufactured by an extrusion process.

4. The battery pack according to claim 1, wherein: The base plate is seamless.

5. The battery pack according to claim 1, wherein: At least one of the plurality of side walls contains a high absorbent resin in which a coolant is absorbed.

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

7. The battery pack according to claim 1, wherein: The plurality of side walls are manufactured by an extrusion process.

8. The battery pack according to claim 1, wherein: The plurality of side walls are seamless.

9. The battery pack according to claim 1, further comprising: A first partition wall disposed between the plurality of battery devices; as well as a plurality of second partition walls, perpendicular to the first partition walls and between the plurality of battery devices, The first partition wall includes a high absorbent resin having a coolant absorbed therein.

10. The battery pack according to claim 9, wherein: The first partition wall includes at least one hollow portion.

11. The battery pack according to claim 9, wherein: At least one of the plurality of second partition walls contains a high absorbent resin in which a coolant is absorbed.

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

13. The battery pack according to claim 1, wherein: The coolant is water, and Wherein, the high absorbency resin is at least one selected from polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, chitosan and sodium carboxymethyl cellulose.

14. A battery pack comprising: Base plate; a plurality of side walls extending from the upper surface of the bottom plate along a first direction perpendicular to the upper surface of the bottom plate; a plurality of battery devices disposed in a space provided by the upper surface of the bottom plate and the plurality of side walls; as well as a high absorbent resin layer disposed on the lower surface of the bottom plate, The high absorbent resin layer includes a high absorbent resin in which a coolant is absorbed.

15. The battery pack according to claim 14, in, The coolant is water, and Wherein, the high absorbency resin is at least one selected from polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharide, chitosan and sodium carboxymethyl cellulose.

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