Battery module and battery pack including same

Abstract

According to an embodiment of the present invention, there is provided a battery module including a battery cell assembly including a plurality of battery cells, a module housing having an internal space for accommodating at least one of the battery cell assemblies, and a cooling unit located on one side of the battery cell assembly, the cooling unit including a first cooling plate and a second cooling plate spaced apart from the first cooling plate to form a coolant flow path and disposed closer to the battery cell assembly than the first cooling plate, and at least a portion of the second cooling plate is provided with a pattern portion.

Description

[Technical field]

[0001] The present invention relates to a battery module and a battery pack including the same.

[0002] This application claims priority to Korean Patent Application No. 10-2021-0065126 filed on May 20, 2021, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings. [Background technology]

[0003] Secondary batteries, which have high applicability to various products and electrical properties such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) that are driven by electric drive sources. These secondary batteries have the primary advantage of dramatically reducing the use of fossil fuels, as well as the advantage of not producing any by-products associated with energy use, and are therefore attracting attention as a new energy source that is environmentally friendly and improves energy efficiency.

[0004] Currently, types of secondary batteries that are widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, and nickel zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack may be configured by connecting a plurality of battery cells in series. Also, a battery pack may be configured by connecting a plurality of battery cells in parallel depending on the charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set depending on the required output voltage and / or charge / discharge capacity.

[0005] In addition, when a battery pack is constructed by connecting a plurality of battery cells in series and / or in parallel, a common method is to first construct a battery module including at least one battery cell, and then use this at least one battery module to add other components to construct a battery pack and / or a battery module.

[0006] In a battery module and / or a battery pack and / or a battery rack including a plurality of battery cells, if a problem occurs in some of the battery cells, causing abnormal heat generation or a resulting fire, the heat generation and / or fire may spread to adjacent battery cells, leading to accidents such as a large-scale fire and / or explosion. Therefore, it is important to improve the cooling performance of such battery cells and ensure safety when a dangerous situation occurs due to overheating, etc. In other words, when a fire situation occurs due to abnormal overheating, etc. in a specific battery cell among the plurality of battery cells, it is important to more quickly and reliably block the transmission of flames and heat to the surrounding battery cells.

[0007] Therefore, it is desirable to find a solution that can provide a battery module that can improve cooling performance and ensure safety, a battery pack, a vehicle, and an energy storage system that include the battery module. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been devised to solve the above problems, and aims to provide a battery module having a structure that can effectively prevent the outbreak of a fire even if high-temperature gas or sparks are generated inside due to abnormal heat generation, etc., and a battery pack, automobile, energy storage system, etc. including the same.

[0009] Furthermore, another object of the present invention is to provide a battery module having improved cooling performance, and a battery pack, a vehicle, and an energy storage system including the same.

[0010] However, the technical problems that the present invention aims to solve are not limited to the problems described above, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Means for solving the problem]

[0011] To achieve the above object, according to one aspect of the present invention, a battery module includes a battery cell assembly including a plurality of battery cells, a module housing having an internal space for accommodating at least one of the battery cell assemblies, and a cooling unit located on one side of the battery cell assembly, the cooling unit including a first cooling plate and a second cooling plate spaced apart from the first cooling plate to form a coolant flow path and positioned closer to the battery cell assembly than the first cooling plate, and at least a portion of the second cooling plate is provided with a pattern portion.

[0012] Here, the module housing may include a side cover and a bottom cover, and the cooling unit may cover an upper portion of the battery cell assembly.

[0013] Furthermore, the pattern portion may be formed on at least one of both surfaces of the second cooling plate.

[0014] Meanwhile, the pattern unit may include at least one groove formed to reduce a thickness of the second cooling plate.

[0015] Meanwhile, the first cooling plate may include at least one recess formed in a direction toward the second cooling plate.

[0016] Alternatively, the recess may be in contact with the second cooling plate.

[0017] Here, the recess may have a shape extending along a length direction or a width direction of the battery module.

[0018] The first cooling plate may include a plurality of the recesses, and the plurality of recesses may be spaced apart from each other.

[0019] On the other hand, the battery cell may be a pouch-type cell having a pair of electrode leads.

[0020] Meanwhile, the battery cell may be disposed upright on the lower cover such that the pair of electrode leads extend along a direction toward the side cover.

[0021] Alternatively, the second cooling plate may be made of aluminum.

[0022] The present invention also provides a battery pack including at least one battery module according to the above-described embodiment.

[0023] Furthermore, the present invention provides a vehicle, characterized in that it includes at least one battery pack according to the above-described embodiments.

[0024] Furthermore, the present invention provides an energy storage system, characterized in that it includes at least one battery pack according to the above-described embodiments. Effect of the Invention

[0025] According to the present invention, the occurrence of a fire in a battery module can be effectively prevented.

[0026] In particular, according to the present invention, even if high-temperature gas and / or sparks are generated due to an abnormal heat generation phenomenon in a specific battery cell included in a battery module, it is possible to prevent a fire from occurring.

[0027] Therefore, according to the present invention, it is possible to provide a battery module capable of ensuring safety when an abnormal situation occurs due to overheating of a battery cell, a battery pack including the same, a vehicle, and an energy storage system.

[0028] Furthermore, according to the present invention, it is possible to provide a battery module having improved cooling performance, and a battery pack, a vehicle, and an energy storage system including the same.

[0029] In addition, the present invention provides various other effects, which will be described in the respective embodiments, or the description of effects that can be easily inferred by a person skilled in the art will be omitted.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical ideas of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters described in the drawings. [Brief description of the drawings]

[0031] [Figure 1] 1 is an exploded perspective view of a battery module according to an embodiment of the present invention; [Diagram 2] 1 is a perspective view of a battery module according to an embodiment of the present invention; [Diagram 3] 1A and 1B are diagrams illustrating an exemplary configuration of a battery cell applied to a battery module according to an embodiment of the present invention. [Figure 4] 3 is a cross-sectional view showing a cross section taken along line AA' in FIG. 2. [Diagram 5] 11A and 11B are views for explaining grooves according to another embodiment of the present invention; [Figure 6] 11A and 11B are views illustrating a groove according to still another embodiment of the present invention; [Figure 7] 11A and 11B are views illustrating a process in which venting occurs in some battery cells, causing coolant to flow into an accommodation space of the battery cell assembly; [Figure 8] 11A and 11B are views illustrating a process in which venting occurs in some battery cells, causing coolant to flow into an accommodation space of the battery cell assembly; [Figure 9] 1 is a diagram illustrating a battery pack according to an embodiment of the present invention; [Figure 10] 1 is a diagram for explaining an automobile according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as having meanings and concepts that correspond to the technical ideas of the present invention, in accordance with the principle that the inventor himself can appropriately define the concepts of terms in order to best describe the invention.

[0033] Therefore, it should be understood that the embodiment described in this specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can be substituted therefor at the time of this application.

[0034] It should be noted that, in order to facilitate understanding of the invention, the accompanying drawings may be drawn not to scale, and the dimensions of some components may be exaggerated.

[0035] FIG. 1 is an exploded perspective view of a battery module according to an embodiment of the present invention, and FIG. 2 is a perspective view of the battery module according to an embodiment of the present invention.

[0036] 1 and 2, a battery module 1 according to the present invention includes at least one battery cell assembly 10, a module housing 20, and a cooling unit 30.

[0037] The battery cell assembly 10 includes a plurality of battery cells 11. The battery cells 11 may be secondary batteries. The battery cell 11 includes an electrode assembly and a battery case that houses the electrode assembly.

[0038] 1, the battery cells 11 arranged in the battery cell assembly 10 may be, for example, pouch-type battery cells 11. However, this does not limit the type of the battery cells 11, and battery cells of other shapes, such as cylindrical cells and rectangular cells, may also be used in the battery cell assembly 10 of the present invention.

[0039] Hereinafter, a description will be given of a case where the battery cell 11 is a pouch-type battery cell as shown in Fig. 3. Fig. 3 is a diagram showing an exemplary shape of a battery cell applied to a battery module according to an embodiment of the present invention.

[0040] The battery cell 11 includes an electrode assembly (not shown), a pouch case 12 that houses the electrode assembly, and a pair of electrode leads 13 that are connected to the electrode assembly and extended to the outside of the pouch case 12.

[0041] The pouch case 12 includes a receiving portion 12a for receiving an electrode assembly, and a seal portion 12b formed around the receiving portion 12a. The pair of electrode leads 13 are coupled to electrode tabs (not shown) provided on the electrode assembly, and are drawn out to the outside of the pouch case 12 via the seal portion 12b. The pair of electrode leads 13 are shaped to extend along the longitudinal direction (direction aligned with the X-axis) of the battery cell 11. The pair of electrode leads 13 may be drawn out in the same direction or in opposite directions. A battery cell 11 in which the pair of electrode leads 13 are drawn out in opposite directions is called a bidirectional cell, and a battery cell 11 in which the pair of electrode leads 13 are drawn out in the same direction is called a unidirectional cell.

[0042] Although only bidirectional cells are shown in the drawings of the present invention, it goes without saying that this is for illustrative purposes only and unidirectional cells may also be applied to the battery module 1 according to an embodiment of the present invention.

[0043] Meanwhile, a plurality of battery cells 11 of the present invention may be stacked facing each other to form a cell stack. For example, as shown in Fig. 1, each battery cell 11 may be arranged upright on a lower cover 22 described later such that a pair of electrode leads 13 extend along a direction toward a side cover 21 described later (direction aligned with the X-axis). Also, a plurality of battery cells 11 may be stacked along the longitudinal direction of the battery module 1 (direction aligned with the Y-axis).

[0044] Due to such an arrangement of the battery cells 11, at least one side of both sides of the battery cell 11 in the width direction (direction aligned along the Z axis) is adjacent to a cooling unit 30, which will be described later. In the pouch-type battery cell 11, venting generally occurs at the side when abnormal heat is generated and the internal pressure increases as a result. That is, when the internal pressure of the battery cell 11 increases, the seal parts 12b formed on both sides of the battery cell 11 in the width direction (direction aligned along the Z axis) are broken before the seal parts 12b formed in the direction in which the electrode leads 13 are pulled out (direction aligned along the X axis).

[0045] Therefore, when venting of the battery cell 11 occurs, the cooling unit 30 is quickly broken, so that the coolant comes into direct contact with the battery cell assembly 10, thereby preventing a fire from occurring or quickly extinguishing an already occurring fire.

[0046] A specific structure of the cooling unit 30 according to the present invention, which can be quickly broken due to the occurrence of venting of the battery cell 11, will be described in detail later.

[0047] Meanwhile, the battery cell assembly 10 may further include a bus bar frame assembly (not shown) for electrically connecting the plurality of battery cells 11.

[0048] A pair of busbar frame assemblies may be provided. The busbar frame assembly includes a busbar frame and at least one busbar. The busbar frames are respectively coupled to one and the other longitudinal sides of a cell stack in which a plurality of battery cells 11 are stacked. The busbar frame may be made of an electrically insulating material such as a resin material. The busbar frame may have holes and / or slits through which the electrode leads 13 are drawn out.

[0049] Meanwhile, the bus bars may be made of an electrically conductive material, for example, a metal material such as copper or nickel, and are connected to adjacent electrode leads 13 extending from a bus bar frame. The bus bars are fixed on the bus bar frame.

[0050] 1, the module housing 20 may include a side cover 21 and a bottom cover 22. The side cover 21 is disposed upright on the bottom cover 22 and encloses the sides of the battery module. Thus, the module housing 20 has an empty space formed therein to accommodate at least one battery cell assembly 10.

[0051] The module housing 20 may be configured to have at least one side open, and the cooling unit 30 may be configured to be located in the open portion. For example, referring to FIG. 1 and FIG. 2, the module housing 20 includes a side cover 21 and a bottom cover 22, and the cooling unit 30 is located to cover the upper portion of the battery cell assembly 10.

[0052] Meanwhile, although not shown, in another embodiment of the present invention, the lower cover 22 of the module housing 20 may be replaced with a cooling unit 30. In this case, the module housing 20 may include only the side cover 21, and the cooling units 30 may be disposed on both sides in the height direction (direction aligned with the Z-axis) of the battery cell assembly 10.

[0053] The cooling unit 30 includes a first cooling plate 31 and a second cooling plate 32 spaced apart from the first cooling plate 31 so as to form a coolant flow path and positioned closer to the battery cell assembly 10 than the first cooling plate 31.

[0054] The first and second cooling plates 31 and 32 are spaced apart from each other, and a flow path through which a coolant flows is formed therebetween. The first and second cooling plates 31 and 32 may be made of a metal material such as aluminum. However, the material of the first and second cooling plates 31 and 32 is not limited thereto, and they may be made of a resin material. The first and second cooling plates 31 and 32 spaced apart from each other may be joined to each other by brazing the peripheries of the plates to each other. However, other joining methods other than brazing are also possible.

[0055] In this manner, since the coolant can be passed between the first cooling plate 31 and the second cooling plate 32, the battery module 1 of the present invention can indirectly cool the multiple battery cells 11 included in the battery module 1. For example, referring to FIG. 1, the cooling unit 30 is structured to cover the upper surface (surface aligned in the XY plane) of the battery cell assembly 10, so that indirect cooling of the multiple battery cells 11 accommodated inside the module housing 20 is possible.

[0056] At least one recess 310 may be provided on the first cooling plate 31. The first cooling plate 31 has a first inlet portion 311 and a first outlet portion 312.

[0057] 1, the recess 310 may be recessed in a direction toward the second cooling plate 32. Specifically, the recess 310 has a recessed shape when viewed from the outer side of the first cooling plate 31, and has a bulged shape when viewed from the inner side of the first cooling plate 31. The recess 310 may be in contact with the second cooling plate 32, and may be firmly connected to the second cooling plate 32, for example, by welding.

[0058] Meanwhile, the recess 310 may have a shape extending along the length direction (direction aligned along the Y axis) or width direction (direction aligned along the X axis) of the battery module 1. Also, a plurality of the recesses 310 may be provided on the first cooling plate 31, and the plurality of the recesses 310 may be arranged spaced apart from each other. For example, as shown in FIG. 1, the recesses 310 may have a shape extending long along the width direction (direction aligned along the X axis) of the battery module 1, or may be arranged in a line spaced apart from each other. When viewed between the first cooling plate 31 and the second cooling plate 32, i.e., from the inside of the cooling unit 30, the recess 310 extends long in the width direction (direction aligned along the X axis) of the battery module 1, and may function as a partition wall that partially divides the coolant flow path. Therefore, the recess 310 serves to guide the coolant flowing into the cooling unit 30 to smoothly flow throughout the cooling unit 30. This can improve the cooling efficiency of the battery module 1.

[0059] Meanwhile, although not shown, the recess 310 may have a shape extending along the longitudinal direction (direction aligned with the Y-axis) of the battery module 1. Alternatively, the recess 310 may have a shape extending along a direction forming a predetermined angle with the X-axis and the Y-axis.

[0060] The first inlet portion 311 functions as a passage through which the coolant flows into the cooling unit 30. The first outlet portion 312 functions as a passage through which the coolant flows out of the cooling unit 30. The first inlet portion 311 and the first outlet portion 312 may be formed at a portion of the periphery of the first cooling plate 31. The first inlet portion 311 and the first outlet portion 312 may be formed in the same direction as in FIG. 1. Alternatively, although not shown, the first inlet portion 311 and the first outlet portion 312 may be formed on opposite sides to each other.

[0061] The second cooling plate 32 has a pattern portion 320. The second cooling plate 32 has a second inlet portion 321 and a second outlet portion 322.

[0062] The pattern unit 320 includes at least one groove G formed to reduce a thickness of the second cooling plate 32. The pattern unit 320 may be formed on at least one of both surfaces of the second cooling plate 32. This will be described in more detail with reference to FIG.

[0063] FIG. 4 is a cross-sectional view showing a cross section taken along line AA' in FIG. 2 showing a battery module according to an embodiment of the present invention.

[0064] Referring to FIG. 4, a pattern unit 320 is formed on a part of a surface facing the battery cell 11 among both sides of the second cooling plate 32. The pattern unit 320 may include at least one groove G formed to reduce the thickness of the second cooling plate 32. For example, the pattern unit 320 shown in FIG. 4 includes six grooves G. When a plurality of grooves G are formed, the plurality of grooves G are spaced apart from each other along the longitudinal direction (direction aligned with the Y-axis) of the battery module 1. When the pattern unit 320 is formed on a surface facing the battery cell 11 among both sides of the second cooling plate 32, the second cooling plate 32 may be quickly broken by contact with high-temperature gas and / or sparks ejected by venting of the battery cell 11.

[0065] 4 to 6, the cross-sectional shape of the groove G may be substantially triangular (see FIG. 4), substantially rectangular (see FIG. 5), or substantially semicircular (see FIG. 6). However, the shape of the groove G is not necessarily limited to these, and any shape that can partially reduce the thickness of the second cooling plate 32 may be used.

[0066] Meanwhile, although not shown in the drawings of the present invention, unlike those shown in Figures 4 to 6, a pattern portion 320 according to another embodiment of the present invention may be formed on one of both sides of the second cooling plate 32 facing the first cooling plate 31, or may be formed on both sides.

[0067] Meanwhile, the groove G may have a shape extending along the longitudinal direction (direction aligned with the X-axis) of the battery cell 11. For example, referring to FIG. 1, each battery cell 11 is arranged standing with the X-axis direction as the longitudinal direction, and the groove G also has a shape extending along the X-axis direction. Therefore, when the pattern unit 320 is broken, a coolant is supplied along the extension direction of the seal unit 12b on one or both sides of the width direction (direction aligned with the Z-axis) of the battery cell 11, thereby effectively preventing the occurrence of a fire or quickly extinguishing an already occurring fire. In consideration of such a function of the pattern unit 320, the grooves G and the seal units 12b of the battery cells 11 may be arranged in one-to-one correspondence with each other.

[0068] Meanwhile, the cooling mechanism of the present invention, which ensures safety when venting of the battery cell 11 occurs due to an abnormality in the battery cell 11, thereby generating high-temperature gas and / or sparks, will be described in more detail with reference to Figures 7 and 8.

[0069] FIG. 7 is a diagram illustrating the case where gas and / or sparks are emitted due to venting of some of the battery cells 11 in FIG. 4, and FIG. 8 is a diagram illustrating the process of coolant flowing into the battery cell assembly 10 through the opening H.

[0070] Referring to FIG. 7, abnormal heat may occur in a specific battery cell 11 among the plurality of battery cells 11, causing high-temperature gas and / or sparks to be spewed out. The sparks include high-temperature metal particles and / or high-temperature electrode active material pieces that are spewed out when the battery cell 11 is vented. Referring to FIG. 7, a pattern unit 320 is formed on a surface of the second cooling plate 32 facing the battery cell 11, and the pattern unit 320 includes a plurality of grooves G extending along the longitudinal direction (direction aligned with the X-axis) of the battery cell 11. The thickness of the second cooling plate 32 may be minimized in at least a portion of the region in which the grooves G are formed. Meanwhile, high-temperature gas and / or sparks spewed out due to venting of the battery cell 11 may come into contact with the grooves G, and at this time, the second cooling plate 32 may be partially melted and / or broken at a point in the groove G where the thickness of the second cooling plate 32 is minimized, thereby forming an opening H.

[0071] 8, the coolant flowing between the first cooling plate 31 and the second cooling plate 32 flows into the battery module 1 through the opening H. As a result, the coolant comes into direct contact with the battery cells 11 to quickly cool the battery cells 11, minimizing heat transfer to the surrounding battery cells 11 and preventing thermal runaway and the resulting large-scale fire.

[0072] The second inlet 321 functions as a passage for introducing the coolant into the cooling unit 30. The second outlet 322 functions as a passage for discharging the coolant from the cooling unit 30. The second inlet 321 and the second outlet 322 may be formed on a part of the periphery of the second cooling plate 32. The second inlet 321 and the second outlet 322 may be formed in the same direction as in FIG. 1. Alternatively, although not shown, the second inlet 321 and the second outlet 322 may be formed on opposite sides to each other. However, the second inlet 321 must be formed at a position corresponding to the first inlet 311 and the second outlet 322 must be formed at a position corresponding to the first outlet 312 in order to function as a passage for the inflow and outflow of the coolant. This is because the first inlet 311 and the second inlet 321 are combined to form a coolant inlet, and the first outlet 312 and the second outlet 322 are combined to form a coolant outlet.

[0073] However, in the drawings of the present invention, the first inlet 311 formed on the first cooling plate 31 and the second inlet 321 formed on the second cooling plate 32 are combined to form a coolant inlet, and similarly, the first outlet 312 formed on the first cooling plate 31 and the second outlet 322 formed on the second cooling plate 32 are combined to form a coolant outlet, but the present invention is not limited thereto. That is, the coolant inlet and the coolant outlet may be any structure that allows the coolant to flow in and out. For example, a structure in which an opening is formed in at least a part of the cooling unit 30, or a structure in which a pipe is formed, may be exemplified.

[0074] FIG. 9 is a diagram illustrating a battery pack 2 according to an embodiment of the present invention.

[0075] 9, a battery pack 2 according to the present invention may include a plurality of the above-described battery modules 1 according to the present invention. In addition, the battery pack 2 according to the present invention may further include various components, such as a BMS (Battery Management System), a pack case, a relay, a current sensor, and other components of a battery pack 2 that are publicly known at the time of filing of the present invention, in addition to the battery module 1.

[0076] FIG. 10 is a diagram for explaining an automobile 3 according to an embodiment of the present invention.

[0077] 10, an automobile 3 according to the present invention may include at least one battery module 1 according to the present invention. In particular, the automobile 3 may include a plurality of battery modules 1 according to the present invention that are electrically connected to each other in order to have a large energy capacity. Alternatively, a plurality of battery modules 1 according to the present invention may constitute one battery pack 2, and the automobile 3 may include at least one such battery pack 2.

[0078] Meanwhile, although not shown, at least one battery module 1 according to the present invention may be included in an energy storage system. In particular, the energy storage system may include a plurality of battery modules 1 according to the present invention, electrically connected to each other, in order to have a large energy capacity. Alternatively, a plurality of battery modules 1 according to the present invention may constitute one battery pack 2, and the energy storage system may include a plurality of such battery packs 2.

[0079] In this specification, terms indicating directions such as up and down are used, but such terms are used merely for the convenience of explanation, and it will be obvious to those skilled in the art that such terms may change depending on the position of the object of interest, the position of the observer, etc.

[0080] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the equivalent scope of the technical concept of the present invention and the scope of the claims. [Explanation of symbols]

[0081] 1 Battery Module 2 Battery pack 3. Automobiles 10 Battery Cell Assembly 11 Battery Cells 12 Pouch Case 12a Storage section 12b Seal part 13 Electrode Lead 20 Module Housing 21 Side cover 22 Lower cover 30 Cooling Unit 31 First cooling plate 32 Second cooling plate 310 Recess 311 1st inflow section 312 First Outlet 320 Pattern section 321 2nd inflow section 322 Second Outlet G groove H open part

Claims

1. a battery cell assembly including a plurality of battery cells; a module housing having an interior space for receiving at least one of the battery cell assemblies; a cooling unit located on one side of the battery cell assembly, the cooling unit includes a first cooling plate and a second cooling plate spaced apart from the first cooling plate to form a coolant flow path and disposed closer to the battery cell assembly than the first cooling plate; At least a portion of the second cooling plate is provided with a pattern portion, The second cooling plate contacts at least a portion of the battery cells.

2. the module housing includes a side cover and a bottom cover; The battery module according to claim 1 , wherein the cooling unit covers an upper portion of the battery cell assembly.

3. The battery module according to claim 1 , wherein the pattern portion is formed on at least one of both surfaces of the second cooling plate.

4. The battery module of claim 1 , wherein the pattern portion includes at least one groove formed to reduce a thickness of the second cooling plate.

5. The battery module of claim 1 , wherein the first cooling plate comprises at least one recess formed in a direction from the first cooling plate to the second cooling plate.

6. The battery module according to claim 5 , wherein the recess contacts the second cooling plate.

7. The battery module according to claim 5 , wherein the recess has a shape extending along a length direction or a width direction of the battery module.

8. the first cooling plate includes a plurality of the recesses; The battery module according to claim 7 , wherein the recesses are spaced apart from one another.

9. The battery cell includes:

3. The battery module according to claim 2, which is a pouch-type cell having a pair of electrode leads.

10. The battery cell includes: The battery module according to claim 9 , wherein the pair of electrode leads are disposed upright on the lower cover so as to extend along a direction toward the side cover.

11. The battery module according to claim 1 , wherein the second cooling plate is made of aluminum.

12. A battery pack comprising the battery module according to any one of claims 1 to 11.

13. A motor vehicle comprising the battery pack of claim 12.

14. 13. An energy storage system comprising the battery pack of claim 12.

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