Battery packs and devices containing them

Abstract

A battery pack according to one embodiment of the present invention includes a battery module including a battery cell stack in which a plurality of battery cells are stacked and a module frame in which the battery cell stack is housed, and a pack frame in which the battery module is housed, wherein a cooling channel through which a refrigerant flows is formed in a bottom of the pack frame, an opening is formed in the bottom of the pack frame, a lower side of the module frame and the refrigerant are in direct contact with each other, and at least one protrusion is formed on an outer surface of the lower side of the module frame.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0126357, filed on September 21, 2023, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery pack and a device including the same, and more particularly to a battery pack with improved cooling performance and a device including the same. [Background technology]

[0003] 2. Description of the Related Art In modern society, the use of portable devices such as mobile phones, notebook computers, video cameras, and digital cameras has become commonplace, and the development of technologies related to such mobile devices has been vigorously pursued.

[0004] In addition, rechargeable secondary batteries are a solution to address air pollution caused by existing gasoline-powered vehicles that use fossil fuels, and are being used as a power source for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), etc., which has led to an increasing need for the development of secondary batteries.

[0005] Currently available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are attracting attention due to their advantages of almost no memory effect compared to nickel-based secondary batteries, free charging and discharging, extremely low self-discharge rate, and high energy density.

[0006] Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive and negative electrode active materials, respectively, and include an electrode assembly in which positive and negative electrode plates coated with the positive and negative electrode active materials are disposed with a separator between them, and a battery case that hermetically houses the electrode assembly together with an electrolyte.

[0007] Generally, lithium secondary batteries can be classified into can-type secondary batteries, in which an electrode assembly is housed in a metal can, and pouch-type secondary batteries, in which an electrode assembly is housed in an aluminum laminated sheet pouch, depending on the shape of the exterior material.

[0008] While secondary batteries used in small devices typically have two or three battery cells, secondary batteries used in medium- to large-sized devices such as automobiles typically use a battery module in which multiple battery cells are electrically connected. Such battery modules improve capacity and output by connecting multiple battery cells in series or parallel to form a stack of battery cells. Furthermore, one or more battery modules may be installed with various control and protection systems, such as a Battery Management System (BMS) and a cooling system, to form a battery pack.

[0009] If a secondary battery's temperature rises above its normal range, its performance may deteriorate, and if the temperature rises too rapidly, it may explode or catch fire. In particular, in a battery module or battery pack comprising multiple secondary batteries, i.e., battery cells, the heat generated from the multiple battery cells may be combined in a small space, causing the temperature to rise even more rapidly. While a battery module with multiple stacked battery cells and a battery pack equipped with such a battery module can produce high output, it is difficult to remove the heat generated from the battery cells during charging and discharging. If the battery cells are not properly able to dissipate heat, they will deteriorate more quickly, shortening their lifespan and increasing the risk of explosion or fire.

[0010] Furthermore, battery modules included in vehicle battery packs are frequently exposed to direct sunlight and may be placed in high temperature conditions such as in summer or desert regions.

[0011] Therefore, when constructing a battery module or a battery pack, it is very important to ensure stable and effective cooling performance.

[0012] Fig. 1 is a perspective view showing a conventional battery module, and Fig. 2 is a cross-sectional view showing a cross section cut along the line A-A' in Fig. 1. In particular, Fig. 2 further shows a heat transfer member and a heat sink located below the battery module.

[0013] Referring to FIGS. 1 and 2, a conventional battery module 10 includes a plurality of battery cells 11 stacked together to form a battery cell stack 20, which is housed in a module frame 30.

[0014] As described above, the battery module 10 generates a large amount of heat during charging and discharging due to the inclusion of multiple battery cells 11. As a cooling means, the battery module 10 may include a thermally conductive resin layer 40 positioned between the battery cell stack 20 and the bottom 31 of the module frame 30. When the battery module 10 is mounted on a pack frame to form a battery pack, a heat transfer member 50 and a heat sink 60 may be sequentially positioned below the battery module 10. The heat transfer member 50 may be a heat dissipation pad. The heat sink 60 may have a refrigerant flow path formed therein.

[0015] Heat generated from the battery cells 11 can be transferred to the outside of the battery module 10 via the thermally conductive resin layer 40, the bottom 31 of the module frame 30, the heat transfer member 50, and the heat sink 60 in this order.

[0016] However, in the case of the conventional battery module 10, the heat transfer path is complicated as described above, making it difficult to effectively transfer heat generated from the battery cells 11. The module frame 30 itself can reduce the heat transfer characteristics, and minute air layers such as air gaps that can be formed between the module frame 30, the heat transfer member 50, and the heat sink 60 can also be factors that reduce the heat transfer characteristics.

[0017] As other demands for battery modules, such as increased capacity, continue to be made, it is essential to develop a battery module that can satisfy all of these various demands while also improving cooling performance. Summary of the Invention [Problem to be solved by the invention]

[0018] The problem to be solved by the present invention is to provide a battery pack with improved cooling performance and a device including the same.

[0019] However, the problems to be solved by the embodiments of the present invention are not limited to the above-mentioned problems, and can be variously expanded within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0020] A battery pack according to one embodiment of the present invention includes a battery module including a battery cell stack in which a plurality of battery cells are stacked and a module frame in which the battery cell stack is housed, and a pack frame in which the battery module is housed, wherein a cooling channel through which a refrigerant flows is formed in a bottom of the pack frame, an opening is formed in the bottom of the pack frame, a lower side of the module frame and the refrigerant are in direct contact with each other, and at least one protrusion is formed on an outer surface of the lower side of the module frame.

[0021] The open portion may be a region formed above the cooling flow path, and may communicate with a space between the cooling flow path and the bottom of the pack frame.

[0022] At least one protrusion may be formed on the outer surface of the lower portion of the module frame.

[0023] The protrusion may be in the form of a plate that protrudes perpendicularly from the outer surface of the lower part of the module frame.

[0024] One end of the protrusion may abut against a lower end of the cooling flow path.

[0025] One end of the protrusion may be spaced apart from a lower end of the cooling channel.

[0026] The protrusion extends along one direction of the battery module and can guide the flow of the coolant along the one direction.

[0027] The protrusion may be integrally formed with the module frame through an extrusion process.

[0028] The protrusion may be welded to the outer surface of the lower side of the module frame.

[0029] A gasket for preventing leakage of the refrigerant may be located along the edge of the open portion between the lower side of the module frame and the bottom of the pack frame.

[0030] The battery module may be attached and coupled to the bottom of the pack frame.

[0031] The battery module may include a mount portion having a mount hole formed therein, and a mount bolt may pass through the mount hole and be fastened to the bottom of the pack frame, or may pass through a pack frame hole formed in the bottom of the pack frame and be fastened with a nut.

[0032] A gasket for preventing leakage of the refrigerant may be located between the lower side of the module frame and the bottom of the pack frame along the edge of the opening.

[0033] A device according to one embodiment of the present invention may include a battery module including a battery cell stack in which a plurality of battery cells are stacked and a module frame in which the battery cell stack is housed, and a pack frame in which the battery module is housed, wherein a cooling channel through which a refrigerant flows is formed in a bottom of the pack frame, and an opening is formed in the bottom of the pack frame, and wherein a lower portion of the module frame and the refrigerant are in direct contact with each other. [Effects of the Invention]

[0034] According to an embodiment of the present invention, a cooling flow path through which a refrigerant flows is formed in the bottom of the pack frame, and the lower part of the module frame is brought into direct contact with the refrigerant flowing in the cooling flow path, thereby improving cooling performance compared to existing battery pack structures in which the bottom of the pack frame is located between the lower part of the module frame and the refrigerant.

[0035] Furthermore, the surface area that comes into contact with the coolant is increased via the protrusions that protrude from the lower side of the module frame, thereby improving the cooling performance of the module.

[0036] Furthermore, the flow of the coolant can be improved by forming a coolant channel in the cooling flow passage through a protrusion that protrudes from the lower side of the module frame.

[0037] Furthermore, by positioning a gasket between the lower side of the module frame and the bottom of the pack frame, the effects of fixing the module and preventing the refrigerant from leaking can be obtained.

[0038] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0039] [Figure 1] FIG. 10 is a perspective view showing a conventional battery module. [Figure 2] FIG. 2 is a cross-sectional view showing a cross section taken along the line AA' in FIG. [Figure 3] 1 is a perspective view showing a pouch-type battery according to an embodiment of the present invention; [Figure 4] 1 is an exploded perspective view showing a battery module according to an embodiment of the present invention; [Figure 5] 1 is a partial perspective view of a battery module and a battery pack according to an embodiment of the present invention; [Figure 6] FIG. 6 is a cross-sectional view showing a cross section taken along the line BB' in FIG. 5. [Figure 7] 10 is a cross-sectional view of a battery module and a battery pack according to another embodiment of the present invention. [Figure 8] 5 is a perspective view of the assembled battery module of FIG. 4, viewed from a different angle to show the underside thereof. FIG. [Figure 9] FIG. 10 is a partial perspective view showing a method for attaching a battery module included in a battery pack and a gasket. DETAILED DESCRIPTION OF THE INVENTION

[0040] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

[0041] As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

[0042] In order to clearly explain the present invention, parts not necessary for the explanation will be omitted, and the same reference numerals will be used throughout the specification to refer to the same or similar components.

[0043] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily shown for the sake of convenience, and the present invention is not necessarily limited to those shown. Thicknesses are exaggerated in the drawings to clearly show various layers and regions. In the drawings, the thicknesses of some layers and regions are exaggerated for the sake of convenience.

[0044] Furthermore, when a layer, film, region, plate, or other part is said to be "on" or "above" another part, this includes not only the case where it is "directly above" that other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Furthermore, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "above" or "above" the direction opposite to gravity.

[0045] Furthermore, throughout the specification, when a part "comprises" other elements, this does not mean that the other elements are excluded, but that the part may further include the other elements, unless otherwise specified.

[0046] Furthermore, throughout the specification, "on a plane" means when the subject part is viewed from above, and "on a cross section" means when the subject part is cut vertically and viewed from the side.

[0047] Fig. 3 is a perspective view showing a pouch-type battery according to an embodiment of the present invention, and Fig. 4 is an exploded perspective view showing a battery module according to an embodiment of the present invention.

[0048] 3 and 4, the battery module 100 according to this embodiment includes a battery cell stack 120 formed by stacking a plurality of battery cells 110. In the battery cell stack 120, the plurality of battery cells 110 may be stacked in one direction. There are no particular limitations on the type of the battery cells 110 according to this embodiment, as long as they are grouped together. That is, the battery cells 110 according to this embodiment may be pouch-type battery cells, prismatic battery cells, or cylindrical battery cells. Hereinafter, as an example, the battery cells 110 according to this embodiment will be described as pouch-type battery cells.

[0049] According to one embodiment, the battery cell 110 may have a structure in which two electrode leads 115 face each other and protrude from both ends of the battery body 113. In another embodiment, all of the electrode leads 115 of the battery cell 110 may protrude in one direction. One of the electrode leads 115 is a positive electrode lead, and the other is a negative electrode lead.

[0050] The battery cell 110 may be manufactured in a pouch shape, with an electrode assembly (not shown) housed in a battery case 117 including a battery body 113. The battery cell 110 may include a connecting portion 119, which is a region extending elongately along the frame, and a protruding portion 110p of the battery cell 110, called a bat-ear, may be formed at an end of the connecting portion 119. The protruding portion 110p may be formed on at least one of both ends of the connecting portion 119 and may protrude in a direction perpendicular to the direction in which the connecting portion 119 extends. The protruding portion 110p may overlap a stepped region formed on one side of a lower frame (described later) to prevent the battery cell 110 from moving due to external impact. In particular, the battery cell 110 may be a pouch-type battery cell, and the thickness of the battery body 113 may be greater than the thickness of the protruding portion 110p.

[0051] A plurality of battery cells 110 may be configured, and the plurality of battery cells 110 may be stacked so as to be electrically connected to each other to form a battery cell stack 120. In particular, as shown in Fig. 4, the plurality of battery cells 110 may be stacked in a direction parallel to the y-axis while standing upright with one side of each battery body 113 (see Fig. 2) facing each other. As a result, the electrode leads 115 may protrude in a direction perpendicular to the stacking direction of the battery cells 110. For example, one electrode lead 115 of a battery cell 110 may protrude in the x-axis direction, and another electrode lead 115 may protrude in the -x-axis direction.

[0052] The battery module 100 according to this embodiment may include a module frame 200 that houses the battery cell stack 120 and end plates 150 that cover the front and rear surfaces of the battery cell stack 120. In addition, the battery module 100 may further include a bus bar frame 130 that is positioned between the end plates 150 and the battery cell stack 120.

[0053] For example, the module frame 200 may include a U-shaped frame 300 with open top, front, and rear surfaces, and an upper plate 400 that covers the top of the battery cell stack 120. However, the module frame 200 is not limited to this and may be replaced with a frame of another shape, such as an L-shaped frame or a monoframe that surrounds the battery cell stack 120 except for the front and rear surfaces.

[0054] The bus bar frame 130 may be fitted with bus bars that electrically connect the electrode leads of the battery cell stacks 120 to electrically connect the battery cell stacks 120 stacked in parallel.

[0055] FIG. 5 is a partial perspective view of a battery module 100 and a battery pack according to an embodiment of the present invention.

[0056] Referring to FIG. 5, a battery pack according to one embodiment of the present invention includes a battery module 100 including a battery cell stack 120 in which a plurality of battery cells 110 are stacked and a module frame 200 in which the battery cell stack 120 is housed, and a pack frame 500 in which the battery module 100 is housed.

[0057] FIG. 6 is a cross-sectional view showing a cross section taken along the line BB' in FIG.

[0058] 5 and 6, a cooling channel 530 through which a refrigerant flows is formed in the bottom 510 of the pack frame 500. An open portion 540 is formed in the bottom 510 of the pack frame 500. The open portion 540 is an area formed above the cooling channel 530, and can communicate with the space between the cooling channel 530 and the bottom 510 of the pack frame 500.

[0059] More specifically, a cooling channel 530, which is a space through which a refrigerant flows, may be formed inside the bottom 510 of the pack frame 500. Although not specifically shown, the cooling channel 530 may be connected to an inlet port and an outlet port provided in the pack frame 500. That is, the refrigerant flowing in through the inlet port may circulate along the cooling channel 530, which is the internal space of the bottom 510 of the pack frame 500, and finally be discharged through the outlet port. The battery pack according to this embodiment may have a water-cooled structure that cools the battery modules through a refrigerant circulation structure.

[0060] An opening 540 may be formed in the cooling channel 530 above a region corresponding to the portion where the battery module 100 is located. By positioning the module frame 200 of the battery module 100 above the opening 540, the coolant comes into direct contact with the lower side of the module frame 200. This improves the cooling performance of the battery module according to this embodiment compared to a conventional battery pack structure in which the bottom 510 of the pack frame 500 is located between the module frame 200 and the coolant.

[0061] 7 is a cross-sectional view of a battery module and a battery pack according to another embodiment of the present invention. In particular, like FIG. 6, FIG. 7 shows a cross-section of a battery module 100 placed on an opening 540 of a pack frame 500.

[0062] FIG. 8 is a perspective view showing the assembled battery module 100 of FIG. 4 at a different angle so that the underside of the battery module 100 can be seen.

[0063] 6 to 8, at least one protrusion 160 may be formed to protrude from the outer surface of the lower side of the module frame 200. The protrusion 160 may protrude perpendicularly from the outer surface of the lower side of the module frame 200. One end of the protrusion 160 may abut against the lower end of the cooling channel 530 or may be spaced apart from the lower end of the cooling channel 530. FIG. 6 shows an embodiment in which one end of the protrusion 160 is spaced apart from the lower end of the cooling channel 530. FIG. 7 shows an embodiment in which one end of the protrusion 160 abuts against the lower end of the cooling channel 530.

[0064] The protrusions 160 extend in one direction of the battery module 100 and can guide the flow of the coolant in one direction. For example, the protrusions 160 can extend in a direction perpendicular to the stacking direction of the battery cells 110 while being parallel to the outer surface of the lower part of the module frame 200. This allows the flow rate of the coolant flowing through each battery cell 110 to be adjusted uniformly, thereby allowing the multiple battery cells 110 in the battery module 100 to be cooled uniformly.

[0065] One end of the protrusion 160 may be spaced apart from the lower end of the cooling channel 530. This provides a space through which the refrigerant can flow smoothly within the cooling channel 530. Because the protrusion 160 does not directly contact the lower end of the cooling channel 530, the refrigerant can flow freely around the protrusion 160, improving cooling performance. This allows each battery cell 110 in the battery module 100 to be uniformly cooled, reducing temperature deviation and improving the efficiency and safety of the battery pack. In addition, the contact area between the protrusion 160 and the refrigerant can be efficiently adjusted, effectively controlling the temperature of the battery cells 110 in the battery module 100. In other words, this prevents the refrigerant from concentrating in a specific area. This allows for uniform heat exchange and prevents a specific battery cell 110 from overheating or overcooling.

[0066] The protrusions 160 may be spaced apart by approximately the thickness of the battery cells 110. By spaced apart according to the thickness of the battery cells 110, the temperature difference between the battery cells 110 in the battery module 100 is minimized, and the entire battery module 100 can be uniformly cooled. In addition, the flow path of the refrigerant can be optimized to minimize flow resistance. This can improve the performance of the battery module 100 and extend the life of each battery cell 110. However, the spacing between the protrusions 160 can be appropriately adjusted taking into account the number and size of the battery cells 110.

[0067] As another example, the protrusions 160 may extend in the same direction as the stacking direction of the battery cells 110 while being parallel to the outer surface of the lower part of the module frame 200. In addition, by arranging such protrusions 160 at regular intervals, the path and flow rate of the coolant flowing through the cooling flow passage 530 can be controlled, thereby improving cooling performance.

[0068] The protrusion 160 according to one embodiment of the present invention may be integrally formed with the module frame 200 through an extrusion process. The protrusion 160 according to another embodiment of the present invention may be welded to the outer surface of the lower part of the module frame 200.

[0069] The protrusions 160 increase the surface area of ​​the lower portion of the module frame 200 that comes into contact with the refrigerant, thereby improving the cooling performance of the battery module. Furthermore, the protrusions 160 protruding from the lower portion of the module frame 200 form refrigerant channels in the cooling flow passages 530, thereby improving the flow of the refrigerant. The shape of the protrusions 160 is sufficient as long as it increases the surface area that comes into contact with the refrigerant, thereby improving the cooling performance, and forming the refrigerant channels. For example, the protrusions 160 may be in the form of a plate that protrudes perpendicularly from the outer surface of the lower portion of the module frame 200. Furthermore, the shape and form of the protrusions 160 are not limited to a specific shape or location.

[0070] FIG. 9 is a partial perspective view showing a method of attaching a battery module and a gasket included in a battery pack.

[0071] 9, a battery module 100 according to an embodiment of the present invention may include a mounting portion 250 having a mounting hole 250a formed therein. A pack frame hole 520 may be formed in a bottom portion 510 of a pack frame 500 at a portion corresponding to the mounting hole 250a of the battery module 100. The battery module 100 may be attached to and coupled to the bottom portion 510 of the pack frame 500. When the battery module 100 is housed in the pack frame 500, a mounting bolt 250b may pass through the mounting hole 250a and be fastened to the bottom portion 510 of the pack frame 500. For example, a screw thread may be formed on the inner wall of the pack frame hole 520, and the mounting bolt 250b may be readily coupled to the pack frame hole 520.

[0072] As another example, the pack frame holes 520 may be holes that penetrate the bottom 510 of the pack frame 500, and the battery modules 100 may be fixed to the pack frame 500 in such a manner that the mounting bolts 250b pass through the pack frame holes 520 in the bottom 510 of the pack frame 500 and are fastened with nuts. Each battery module 100 may be attached and coupled in this manner.

[0073] A gasket 600 may be positioned between the lower side of the module frame 200 and the bottom 510 of the pack frame 500 to prevent the coolant flowing through the cooling channel 530 from leaking through the open portion 540. The gasket 600 may be made of an elastic material. For example, the gasket 600 may be made of rubber. Therefore, when pressure is applied to the gasket 600, the shape of the gasket 600 changes, thereby preventing the coolant flowing through the cooling channel 530 from leaking. The gasket 600 may be positioned along the edge of the open portion 540 of the pack frame 500.

[0074] The bottom 510 of the pack frame 500 may include a groove in which the gasket 600 is installed. The groove may be recessed to a certain depth along the shape of the opening 540. The gasket 600 may be inserted into the groove. The shape of the gasket 600 may correspond to the shape of the groove. The width of the gasket 600 may be smaller than the width of the groove, and the height of the gasket 600 may be greater than the height of the groove.

[0075] The gasket 600 may include ribs that are visible to the naked eye to improve assembly by preventing the gasket 600 from coming out of the groove or overlapping certain areas of the gasket 600 during assembly. The gasket 600 may also include protrusions that can be tightly fitted to the groove so that certain areas overlap, improving fixing strength when fitted into the groove.

[0076] A gasket 600 is positioned between the lower side of the module frame 200 and the bottom 510 of the pack frame 500, and the battery module 100 can be attached to and coupled to the bottom 510 of the pack frame 500. In the battery pack according to this embodiment, the battery module 100 is attached to and coupled to the bottom 510 of the pack frame 500, and the fastening force applied to the battery module 100 when the battery module 100 is fixed to the pack frame 500 can be used as pressure to be applied to the gasket 600. Attaching and coupling the battery module 100 to the bottom 510 of the pack frame 500 not only secures the battery module 100 to the pack frame 500, but also improves sealing to prevent refrigerant leakage from the cooling channels 530. In other words, the attachment of the battery module 100 can be used as a means for preventing refrigerant leakage.

[0077] In this embodiment, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are used for convenience of explanation and may vary depending on the position of the object of interest, the position of the observer, etc.

[0078] One or more battery modules according to the above-described embodiments may be mounted together with various control and protection systems such as a BMS (Battery Management System), a BDU (Battery Disconnect Unit), and a cooling system to form a battery pack.

[0079] The battery module or battery pack can be applied to various devices, specifically, but not limited to, transportation means such as electric bicycles, electric cars, and hybrid vehicles, and can be applied to various devices that can use secondary batteries.

[0080] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention. [Explanation of symbols]

[0081] 100 battery modules 110 battery cells 113 Battery body 115 Electrode Lead 117 Battery Case 119 Connection section 120 Battery cell stack 130 Busbar Frame 150 end plate 160 Protrusion 200 Module Frame 250 Mounting section 300 U-frame 400 Upper Plate 500 Pack Frames 510 Bottom 530 Cooling Channel 540 Open area 600 gaskets

Claims

1. a battery module including a battery cell stack in which a plurality of battery cells are stacked and a module frame in which the battery cell stack is housed; and a pack frame in which the battery module is housed; A cooling flow path through which a refrigerant flows is formed in the bottom of the pack frame, an opening formed in the bottom of the pack frame, and a lower side of the module frame directly contacts the refrigerant.

2. The battery pack according to claim 1 , wherein the open portion is a region formed above the cooling flow path, and communicates with a space between the cooling flow path and the bottom of the pack frame.

3. The battery pack according to claim 1 or 2, wherein at least one protrusion is formed on an outer surface of the lower portion of the module frame.

4. The battery pack according to claim 3 , wherein the protrusion is a plate-like member that protrudes perpendicularly from the outer surface of the lower portion of the module frame.

5. The battery pack according to claim 4 , wherein one end of the protrusion abuts against a lower end of the cooling channel.

6. The battery pack according to claim 4 , wherein one end of the protrusion is spaced apart from a lower end of the cooling channel.

7. The battery pack according to claim 4 , wherein the protrusion extends along one direction of the battery module and guides the flow of the coolant along the one direction.

8. The battery pack according to claim 3 , wherein the protrusion is integrally formed with the module frame through an extrusion process.

9. The battery pack according to claim 3 , wherein the protrusion is welded to the outer surface of the lower side of the module frame.

10. 3. The battery pack according to claim 1, wherein a gasket for preventing leakage of the coolant is located along an edge of the opening between the lower side of the module frame and the bottom of the pack frame.

11. The battery pack according to claim 1 or 2, wherein the battery module is attached and coupled to the bottom of the pack frame.

12. the battery module includes a mounting portion having a mounting hole formed therein; 12. The battery pack according to claim 11, wherein a mounting bolt passes through the mounting hole and is fastened to the bottom of the pack frame, or passes through a pack frame hole formed in the bottom of the pack frame and is fastened with a nut.

13. 12. The battery pack according to claim 11, wherein a gasket for preventing leakage of the coolant is located along an edge of the opening between the lower side of the module frame and the bottom of the pack frame.

14. A device comprising the battery pack of claim 1 or 2.

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