Battery module and battery pack including same

Abstract

A battery module according to one embodiment of the present invention includes a battery cell assembly in which a plurality of battery cells are stacked, a first sub-module and a second sub-module each including a busbar structure including a busbar that electrically connects the battery cells and a busbar frame that covers at least one side of the battery cell assembly, a module housing that simultaneously houses the first sub-module and the second sub-module, and a terminal assembly located in a portion of the module housing that overlaps with a module extension where the first sub-module and the second sub-module face each other.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0153757 dated November 16, 2022, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery module and a battery pack including the same, and more particularly to a battery module with improved energy density, cooling efficiency, and safety, and a battery pack including the same. [Background technology]

[0003] With technological development and increasing demand for mobile devices, the demand for secondary batteries as an energy source is rapidly increasing. In particular, secondary batteries are attracting great interest as an energy source for mobile devices such as mobile phones, digital cameras, laptops, and wearable devices, as well as for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles.

[0004] While small mobile devices use one, two, three, or four battery cells per device, medium- to large-sized devices such as automobiles require high output and large capacity. Therefore, medium- to large-sized battery modules, which electrically connect multiple battery cells, are used.

[0005] Meanwhile, when connecting multiple battery cells in series / parallel to form a battery module and / or a battery pack, a common method is to form a battery module consisting of at least one battery cell, and then use the at least one battery module to add other components to form a battery pack.

[0006] Because the battery cells that make up such medium- to large-sized battery modules are composed of rechargeable secondary batteries, such high-power, large-capacity secondary batteries generate a large amount of heat during the charging and discharging process. In this case, the heat generated from the multiple battery cells can be combined in a small space, causing the temperature to rise rapidly and severely. In other words, a battery module in which multiple battery cells are stacked and a battery pack equipped with such a battery module can produce high power output, but it is difficult to remove the heat generated from the battery cells during charging and discharging. If the heat from the battery cells is not properly dissipated, the battery cells will deteriorate quickly, their lifespan will be shortened, and the risk of explosion or fire will increase.

[0007] 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. Also, because multiple battery modules are concentrated in one location to increase the vehicle's mileage, fire or heat generated in one battery module can easily spread to adjacent battery modules, ultimately leading to fire or explosion of the battery pack itself.

[0008] FIG. 1 is a diagram showing a heat dissipation path in a conventional battery module.

[0009] 1, a conventional battery module 30 includes a cell assembly 70 including battery cells 60 stacked in a predetermined direction, and a module housing 40 that houses the cell assembly 70. The cell assembly 70 is fixed onto a thermally conductive resin layer 50 located on the underside of the module housing 40. In this case, to cool heat generated in the cell assembly 70, a heat sink 90 is provided facing the bottom of the module housing 40 located in the -z-axis direction of FIG. 1, and a thermally conductive pad 80 for heat transfer may be additionally installed between the heat sink 90 and the bottom of the module housing 40.

[0010] However, since the heat sink 90 does not directly contact the cell assembly 70 to receive heat, the cooling efficiency is not very high, and the cooling path is formed in one direction (-z axis direction) of the width of the battery cell, which can cause a temperature gradient.

[0011] Therefore, in order to extend the life of the battery module and / or battery pack, it is necessary to improve the cooling efficiency of the battery module / battery pack so that the temperature of the battery cells does not become too high.

[0012] Furthermore, because a battery pack is made up of a large number of battery modules, it is heavy, and loading a large number of battery modules into a vehicle such as an automobile requires a large volume and requires an improvement in energy density.

[0013] Fig. 2 is a diagram showing a conventional battery pack, and Fig. 3 is an exploded perspective view of the battery pack of Fig. 2.

[0014] 2 and 3, a conventional battery pack 10 includes a lower pack frame 11 on which a plurality of battery modules 30 are mounted, an upper pack frame 12 located above the battery modules 30, and an internal beam 13 that defines the positions within the battery pack 10 where the battery modules 30 are mounted.

[0015] When battery modules 30 are mounted in a battery pack 10, the energy density of the battery pack 10 may be reduced due to the internal beams 13 that separate the battery modules 30. Also, adding a cooling structure to improve cooling efficiency results in a lack of space, which requires a greater number of battery modules 1 to achieve the required efficiency in a device or the like. Furthermore, the weight of the battery pack 10 limits the number of battery packs 10 that can be mounted in a device. Therefore, in order to reduce the weight of the battery pack 10 and at the same time reduce the energy density of the battery pack 10, a greater number of battery modules 1 must be mounted in the battery pack 10.

[0016] In summary, in order to improve the safety of battery modules and battery packs, a more effective method is needed to improve the cooling efficiency of battery modules and compensate for the reduction in energy density caused by cooling structures, internal beams, etc. Summary of the Invention [Problem to be solved by the invention]

[0017] The present invention provides a battery module having improved cooling efficiency, safety, and energy density, and a battery pack including the same.

[0018] However, the problems to be solved by the embodiments of the present invention are not limited to the above problems, and can be variously expanded within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0019] A battery module according to one embodiment of the present invention includes a battery cell assembly in which a plurality of battery cells are stacked, a first sub-module and a second sub-module, each of which includes a busbar structure including a busbar that electrically connects the battery cells and a busbar frame that covers the battery cell assembly on at least one side, a module housing that simultaneously houses the first sub-module and the second sub-module, and a terminal assembly, wherein the terminal assembly is located in a portion of the module housing that overlaps with a module extension portion, and the first sub-module and the second sub-module face each other at the module extension portion.

[0020] A step may be formed in a portion of the module housing where the terminal assembly is located.

[0021] The terminal assembly may be attached to the stepped portion.

[0022] The terminal assembly may include a terminal housing and a terminal bus bar attached to the terminal housing.

[0023] The terminal housing may have a first hole formed therein, the terminal bus bar may have a second hole formed therein, and the stepped portion may have a third hole formed therein, and the battery module may further include a connecting member passing through the first hole, the second hole, and the third hole.

[0024] The connecting member may be formed of a conductive material, and may electrically connect the internal bus bar of the first sub-module or the internal bus bar of the second sub-module to the terminal bus bar.

[0025] The terminal bus bars may include a first terminal bus bar and a second terminal bus bar, and the first terminal bus bar and the second terminal bus bar may have different polarities.

[0026] The connecting member may include a first connecting member and a second connecting member, the first connecting member electrically connecting the first terminal bus bar and a first internal bus bar of the first sub-module, and the second connecting member electrically connecting the second terminal bus bar and a second internal bus bar of the second sub-module.

[0027] The terminal housing may have a bent shape so as to wrap around the corners of the side surfaces of the module housing.

[0028] The battery module may further include sealing assemblies covering both open ends of the module housing.

[0029] The sealing assembly may include a first sealing assembly covering one open end of the module housing and a second sealing assembly covering the other open end of the module housing, the first sealing assembly including an outlet which is a hole through which the refrigerant is discharged, and the second sealing assembly including an inlet which is a hole through which the refrigerant is introduced.

[0030] The outlet may be located above a center of the first sealing assembly based on a height of the first sealing assembly, and the inlet may be located below a center of the second sealing assembly based on a height of the second sealing assembly.

[0031] The coolant may be in direct contact with the battery cell assemblies and the bus bar structure housed inside the module housing, and the coolant may be insulating oil.

[0032] A first sealing member may be interposed along a periphery of the sealing assembly that mates with one open end of the module housing.

[0033] The sealing assembly may include a second sealing member interposed in a gap present in an area other than the periphery.

[0034] The sealing assembly may include a third sealing member interposed along a periphery of the end plate.

[0035] The sealing assembly may include a module venting portion provided in a region of the sealing assembly, and the module venting portion may include a venting hole penetrating the sealing assembly, a module connection portion which is a hole connected to the venting hole, a fixed cover which is provided between the venting hole and the bus bar structure and is fixed in contact with an inner surface of the sealing assembly, and a membrane which is provided between the venting hole and the fixed cover and is fixed in contact with the fixed cover.

[0036] The module connection portion may further include a venting protrusion that protrudes from the sealing assembly in a direction opposite to the module housing and surrounds the module connection portion and is a region that protrudes from the sealing assembly in a direction opposite to the module housing.

[0037] An end plate covering the sealing assembly provided with the module connection portion and the protrusion may include a venting opening, which may be a hole that penetrates the end plate, and the module connection portion and the protrusion may be positioned through the venting opening.

[0038] The module extension may include a portion where the electrode leads in the first sub-module are electrically connected to each other and a portion where the electrode leads in the second sub-module are electrically connected to each other.

[0039] A battery pack according to another embodiment of the present invention includes a plurality of the battery modules, and the battery modules further include sealing assemblies covering both open ends of the module housing.

[0040] The battery pack may further include an internal beam disposed between a first battery module and a second battery module adjacent to each other in a direction perpendicular to a direction in which the first sub-module and the second sub-module are arranged, and the terminal assembly may be disposed to overlap the internal beam in the vertical direction.

[0041] The terminal assembly may be positioned in a headspace of the inner beam.

[0042] The terminal assembly may include a first terminal assembly located in the first battery module and a second terminal assembly located in the second battery module, and the battery pack may further include a connecting member connecting the first terminal assembly and the second terminal assembly.

[0043] The first terminal assembly and the second terminal assembly each include a terminal housing and a terminal bus bar attached to the terminal housing, the first terminal assembly has different terminal bus bars formed therein, and the second terminal assembly has different terminal bus bars formed therein, the first terminal bus bar of the first terminal assembly and the second terminal bus bar of the second terminal assembly are electrically connected via the connecting member, and the first terminal bus bar and the second terminal bus bar may have different polarities.

[0044] The battery pack may further include a pack venting portion connected to the battery module.

[0045] The pack venting portion may include a pack connection portion connected to the battery module, a direction adjusting portion which is a pipe communicating with the pack connection portion, and an exhaust port provided in a region of the side pack frame and connected to the direction adjusting portion.

[0046] The direction adjustment portion may be located inside the side pack frame, one end of the direction adjustment portion may be closed, and the other end of the direction adjustment portion may be connected to the outlet, and the pack connection portion may be an area protruding from one surface of the direction adjustment portion toward the battery module.

[0047] The pack connection portion may be located through one face of the side pack frame.

[0048] The pack connection portion may be connected to a module connection portion of the battery module, and the module connection portion may be a hole communicating with the inside of the battery module. [Effects of the Invention]

[0049] According to the embodiment, the insulating coolant capable of directly cooling the battery cells and bus bars can be circulated within the battery module, thereby improving the cooling efficiency.

[0050] Furthermore, the reduction in energy density caused by the inlet and outlet structure for circulating insulating coolant within the battery module can be offset by realizing a long module.

[0051] In addition, the terminal assembly is formed on the side of the module housing, and the space above the internal beam is utilized to increase space utilization, thereby improving energy density.

[0052] The effects of the present invention are not limited to the effects described above, and effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from this specification and the accompanying drawings. [Brief explanation of the drawings]

[0053] [Figure 1] 1 is a diagram showing a heat dissipation path in a conventional battery module. [Figure 2] 1 is a diagram showing a conventional battery pack. [Figure 3]FIG. 3 is an exploded perspective view of the battery pack of FIG. 2. [Figure 4] 1 is a perspective view of a battery pack according to an embodiment of the present invention; [Figure 5] FIG. 5 is an exploded perspective view of the battery pack of FIG. 4. [Figure 6] FIG. 3 is a plan view showing a battery module mounted in the conventional battery pack of FIG. 2. [Figure 7] 5 is a plan view showing a battery module attached to the battery pack of FIG. 4. FIG. [Figure 8] 1 is a perspective view of a battery module according to an embodiment of the present invention; [Figure 9] 9A and 9B are diagrams for explaining the terminal assembly of FIG. 8 before and after installation. [Figure 10] FIG. 9 is an exploded perspective view of the battery module of FIG. 8. [Figure 11] 1 is a perspective view of a sub-module constituting a battery module according to an embodiment of the present invention; [Figure 12] FIG. 12 is an exploded view of the submodule of FIG. 11. [Figure 13] FIG. 9 is a perspective view of the battery module of FIG. 8 with the module housing removed. [Figure 14] FIG. 14 is a perspective view of the battery module in which a side plate is added to the battery module in FIG. 13. [Figure 15] FIG. 15 is an exploded perspective view of the battery module of FIG. [Figure 16] FIG. 14 is a diagram showing the module being inserted into the housing. [Figure 17] 14 is a diagram showing A1 of FIG. 13. [Figure 18] 14 is a diagram showing A2 of FIG. 13. [Figure 19] 1 is a perspective view showing a state in which a plurality of battery modules are electrically connected according to an embodiment of the present invention; [Figure 20] 20 is an enlarged view of a region P in FIG. 19. [Figure 21] 2 is a diagram showing an electrical connection relationship in a battery module according to an embodiment of the present invention. [Figure 22] 1 is a diagram showing a current path in a battery module. [Figure 23] 1 is a perspective view showing a first sealing assembly according to an embodiment of the present invention attached to one surface of a module housing. [Figure 24] 24A and 24B are views showing the process of assembling the first sealing assembly of Fig. 23, in which (a) shows the module connector being coupled to the first sealing cover, (b) shows the sensing unit being coupled to the first sealing cover, and (c) shows the module connector and sensing unit both coupled to the first sealing cover. [Figure 25] 25A and 25B are views showing the process of attaching the first sealing assembly of FIG. 24 to one side of the module housing, where (a) is a view showing the sensing cable being electrically connected to the flexible printed circuit board, (b) is a view showing the first sealing assembly being coupled to the module housing, and (c) is a view showing the first sealing assembly and the module housing being sealed. [Figure 26] 1 is an exploded perspective view showing a first end plate mounted to a first sealing assembly according to an embodiment of the present invention; FIG. [Figure 27] 27 is a view of the first end plate attached to the first sealing assembly as viewed from the -x-axis direction of FIG. 26. [Figure 28] 28 is a view showing A5 cut along BB' in FIG. 27. [Figure 29] 10 is a view showing a second sealing assembly mounted on another surface of a module housing according to an embodiment of the present invention. [Figure 30] 10 is an exploded perspective view showing a second end plate attached to a second sealing assembly according to an embodiment of the present invention. FIG. [Figure 31] 31 is a view of the second end plate attached to the second sealing assembly as viewed from the -x-axis direction of FIG. 30. [Figure 32]32 is a view showing A6 cut along CC' in FIG. 31. [Figure 33] FIG. 10 is an exploded perspective view of a second sealing assembly according to another embodiment of the present invention. [Figure 34] This is a drawing of Figure 33 as seen from the -y-axis direction. [Figure 35] 34 is a view showing the second sealing assembly of FIG. 33 coupled to a second end plate. [Figure 36] 1 is a perspective view showing the inside of a battery pack according to an embodiment of the present invention; [Figure 37] 1 is a view showing a pack venting unit according to an embodiment of the present invention; [Figure 38] FIG. 37 is a cross-sectional view taken along the line DD' in FIG. 36. [Figure 39] This is a perspective view of Figure 36 as seen from the -z axis direction. DETAILED DESCRIPTION OF THE INVENTION

[0054] The present invention can be embodied in various different forms and is not limited to the embodiments described herein.

[0055] To clearly describe the present invention, parts unnecessary 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.

[0056] 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 in the drawings. In the drawings, thicknesses are exaggerated to clearly show various layers and regions. In the drawings, thicknesses of some layers and regions are exaggerated for the sake of convenience.

[0057] Furthermore, throughout the specification, when a part is said to "comprise" a certain element, this means that it may further include other elements, not excluding other elements, unless otherwise specified.

[0058] Also, throughout the specification, "on a plane" means a view of the subject part from above, and "on a cross section" means a view of the subject part cut vertically from the side.

[0059] Hereinafter, an electrode assembly according to an embodiment of the present invention will be described. However, the description will be based on a partial cross section of the electrode assembly, but the description is not limited to this, and the same or similar content can be applied to other cross sections.

[0060] 4 and 5, a battery pack 1000 according to an embodiment of the present invention includes a lower pack frame 1100 on which a plurality of battery modules 100 are mounted, an upper pack frame 1200 located on top of the battery modules 100, and at least one pack vent 2000 provided on a side of the lower pack frame 1100. Here, the lower pack frame 1100 and the upper pack frame 1200 are joined to each other by a method such as welding, thereby sealing the interior of the battery pack 1000.

[0061] The battery module 100 may include a battery cell assembly 120 in which a plurality of battery cells are stacked in a predetermined direction, and a module housing 200 that houses the battery cell assembly 120. The module housing 200 may be a monoframe made of a metal plate with its top, bottom (z-axis direction and -z-axis direction) and both side surfaces (y-axis direction and -y-axis direction) integrated. The battery cell assembly 120 may be mounted inside the module housing 200 to form the battery module 100. However, the module housing 200 is not limited to the above, and may include an upper frame and a lower frame.

[0062] The lower pack frame 1100 includes a side pack frame 1150 and at least two internal beams 1110 formed on the bottom surface of the lower pack frame 1100. Here, the bottom surface of the lower pack frame 1100 and the at least two internal beams 1110, and the bottom surface of the lower pack frame 1100 and the side pack frame 1150 may be connected to each other by a method such as welding.

[0063] The plurality of battery modules 100 may be separated from one another by the side pack frame 1150 and at least two internal beams 1110. In other words, the plurality of battery modules 100 may be disposed in the area between the internal beams 1110 of the side pack frame 1150 and in the area between adjacent internal beams 1110. More specifically, in the battery pack 1000, a battery module 100 may be disposed between a pair of adjacent internal beams 1110 among the plurality of internal beams 1110, and the battery module 100 may be disposed between the internal beam 1110 and the side pack frame 1150.

[0064] As a result, the plurality of battery modules 100 are surrounded by at least two internal beams 1110 and the side pack frame 1150, and each battery module 100 can be protected from external impacts. The internal beams 1110 can act as a kind of rigid beam.

[0065] The side pack frame 1150 may be disposed on the periphery of the bottom surface of the lower pack frame 1100 and may extend upward from the bottom surface of the lower pack frame 1100. More specifically, it may extend upward from each periphery of the bottom surface of the lower pack frame 1100. Here, the upper end of the side pack frame 1150 may contact the upper pack frame 1200. At this time, the upper end of the side pack frame 1150 and the upper pack frame 1200 may be joined to each other by a method such as welding, thereby sealing the interior of the battery pack 1000.

[0066] The internal beams 1110 may be spaced apart from one another. Here, the distance between adjacent internal beams 1110 may be the same as or greater than the size of the battery module 100.

[0067] Additionally, the ends of the internal beam 1110 can contact the inner surface 1152 of the side pack frame 1150. More specifically, both ends of the internal beam 1110 can contact the inner surface 1152 of the side pack frame 1150, respectively.

[0068] Fig. 6 is a plan view showing a battery module attached to the conventional battery pack of Fig. 2. Fig. 7 is a plan view showing a battery module attached to the battery pack of Fig. 4.

[0069] Referring to FIG. 6, a conventional battery pack 10 includes multiple battery modules 1 mounted between internal beams 13 that define a lower pack frame 11. The internal beams 13 are arranged in the x-axis and y-axis directions to define an internal space within the lower pack frame 11, and multiple battery modules 1 can be mounted between the spaces. One end and the other end of the battery module 1 can be positioned in contact with the inner surface of the lower pack frame 11 and the internal beams 13, or positioned slightly apart. That is, the internal beams 13 can be positioned as shown in FIG. 6, and the inclusion of the internal beams 13 extending along the y-axis can increase the weight of the battery pack 10. This results in a problem of low energy density of the battery pack 10. Therefore, to solve this problem, in this embodiment, multiple conventional battery modules 1 can be connected as sub-modules to form a single battery module 100, as shown in FIG. 7.

[0070] Specifically, referring to FIG. 7, a battery pack 1000 according to an embodiment of the present invention includes a plurality of battery modules 100 mounted between internal beams 1110 that define a lower pack frame 1100 .

[0071] As described above, the battery module 100 may be formed by connecting two battery modules 1 arranged in the x-axis direction in FIG. 6 . For example, the battery module 100 of this embodiment may be formed by arranging the respective battery cell assemblies constituting the battery module 1 of FIG. 6 in a row and storing them in a single module housing. That is, two battery cell assemblies constituting the two battery modules 1 of FIG. 6 in a row in the length direction (x-axis direction) to form one battery module 100. Therefore, the battery module 100 of this embodiment may be longer in the x-axis direction than a conventional battery module 1.

[0072] Referring to FIG. 6 , in the conventional battery pack 10, the internal beams 13 are aligned along the x-axis and y-axis to define a space inside the lower pack frame 1100, and multiple battery modules 100 may be mounted within the space. In contrast, referring to FIG. 7 , unlike the conventional battery pack 10, the battery pack 1000 of this embodiment has internal beams 1110 that are not aligned along the y-axis. This is because the length (x-axis direction) of the battery module 100 is increased compared to the conventional battery pack 10, and one and the other ends of the battery module 100 in the length direction (x-axis direction) abut against the side pack frame 1150 or fill the space between the side pack frame 1150 and the end of the battery module 100, so the internal beams 1110 do not need to define the battery module 100 in the direction (y-axis direction) perpendicular to the length direction (x-axis direction) of the battery module 100. In other words, due to the structure of the battery module 100 described above, the number of internal beams 1110 provided in the battery pack 1000 in this embodiment is reduced compared to the conventional case, and therefore the weight of the battery pack 1000 is reduced and the energy density is increased.

[0073] Hereinafter, a battery module 100 according to an embodiment of the present invention will be described in detail.

[0074] Fig. 8 is a perspective view of a battery module according to an embodiment of the present invention, Fig. 9 is a view for explaining the state before and after mounting of the terminal assembly of Fig. 8, and Fig. 10 is an exploded perspective view of the battery module of Fig. 8.

[0075] 8 to 10, a battery module 100 according to an embodiment of the present invention may be formed by arranging a plurality of sub-modules, each of which corresponds to a conventional battery module, in a row to form a single battery module 100. Specifically, in the battery module 100 of this embodiment, the respective battery cell assemblies that constitute two conventional battery modules are arranged long in the x-axis direction and housed together in a single module housing 200.

[0076] The battery module 100 according to this embodiment includes a battery cell assembly 120 in which a plurality of battery cells are stacked, a module housing 200 that houses the battery cell assembly 120, a busbar structure 300 located on the front and / or rear surface of the battery cell assembly 120, a sealing assembly 400 that covers the front and / or rear surface of the busbar structure 300, and an end plate 500 that covers the front and / or rear surface of the sealing assembly 400.

[0077] First, the battery cell 110 may be a pouch-type battery cell. Such a pouch-type battery cell may be formed by housing an electrode assembly in a pouch case made of a laminate sheet including a resin layer and a metal layer, and then heat-sealing the sealing portion of the pouch case. In this case, the battery cell 110 may be formed into a rectangular sheet structure.

[0078] A plurality of such 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 assembly 120. In particular, as shown in Figures 8 and 10, the plurality of battery cells 110 may be stacked along the y-axis direction. As described above, the direction in which the plurality of battery cells 110 are stacked may be defined as the width direction of the battery cell assembly 120.

[0079] The module housing 200 may be configured to protect the battery cell assembly 120 and the electrical components connected thereto from external physical shocks. The module housing 200 can accommodate the battery cell assembly 120 and the electrical components connected thereto in its internal space.

[0080] The module housing 200 may have a variety of structures. According to this embodiment, the module housing 200 may have a monoframe structure. Here, the monoframe may be in the form of a metal plate with an integrated top, bottom, and both side surfaces. The monoframe may be manufactured by extrusion molding.

[0081] However, the structure of the module housing 200 is not limited thereto, and as another example, the module housing 200 may have a structure in which a U-shaped frame and an upper plate are combined. In this case, the U-shaped frame may be formed by combining or integrating the bottom and both side surfaces of the module housing 200. In this case, each frame or plate constituting the U-shaped frame may be manufactured by press molding. Furthermore, the module housing 200 may have a monoframe or U-shaped frame structure, an L-shaped frame structure, or various other structures not described in the above examples.

[0082] The module housing 200 may be provided in a form in which the front and rear surfaces are open along the length direction (x-axis direction) of the battery cell assembly 120. In this case, the front and rear surfaces of the battery cell assembly 120 may not be covered by the module housing 200. The front and rear surfaces of the battery cell assembly 120 may be covered by a bus bar structure 300, a sealing assembly 400, an end plate 500, or the like, thereby protecting the front and rear surfaces of the battery cell assembly 120 from external physical impacts, etc.

[0083] The busbar structure 300 includes a busbar frame 310 (described below) and a busbar 330 attached to one surface of the busbar frame 310. The busbar structure 300 may be formed to be located on the open first side (x-axis direction) and second side (-x-axis direction) of the module housing 200 and cover the battery cell assembly 120. The busbar structure 300 may electrically connect the battery cells 110 constituting the battery cell assembly 120 in series or parallel.

[0084] The busbar structure 300 may include a busbar frame 310, a busbar 330, and a terminal busbar 340, which are described below.

[0085] The sealing assemblies 400 may be formed to be located on the first open side (x-axis direction) and the second open side (-x-axis direction) of the module housing 200 and to cover the battery cell assemblies 120. The sealing assembly 400 located on the first open side of the module housing 200 may be a first sealing assembly 410, and the sealing assembly 400 located on the second open side of the module housing 200 may be a second sealing assembly 450.

[0086] The sealing assembly 400 can separate the open first and second sides of the module housing 200 from the external environment. Specifically, when a refrigerant is injected into the module housing 200 (described later), the sealing assembly 400 can seal the refrigerant to prevent it from leaking to the outside.

[0087] The sealing assembly 400 may include a sealing cover, an inlet 421 into which a refrigerant flows, and an outlet 461. Specifically, the refrigerant flows into the module housing 200 through the inlet 421 and can then be discharged to the outside of the battery module 100 through the outlet 461. The refrigerant is in direct contact with the battery cell assemblies 120 and other electrical components mounted inside the module housing 200, as well as the bus bar structure 300, and can receive heat generated therefrom.

[0088] The refrigerant may be a fluid. However, since the refrigerant is in direct contact with the battery cell assemblies 120, other electrical components, and the bus bar structure 300 within the battery module 100, it must be electrically insulated. Therefore, the refrigerant may be a material with insulating properties. For example, the refrigerant may be insulating oil.

[0089] As described above, the refrigerant directly contacts the battery cell assemblies 120 and other electrical components that generate heat within the battery module 100, as well as the bus bar structure 300, and transfers heat thereto, thereby directly cooling them. This improves cooling efficiency compared to conventional methods of indirectly cooling battery modules using a heat sink or the like, thereby extending the life of the battery.

[0090] 7 and 8, the first sub-module 100a and the second sub-module 100b include a terminal assembly 315 located in a portion of the module housing 200 that overlaps with the module extension portion A3, which faces each other. The module extension portion A3 may be located in the center of the battery module 100 in the length direction (x-axis direction). A stepped portion 200D may be formed in the portion of the module housing 200 where the terminal assembly 315 is located. The stepped portion 200D may have a structure that is recessed from the outer surface of the module housing 200 toward the interior where the battery cell assemblies are housed. In this case, the terminal assembly 315 may be attached to the stepped portion 200D.

[0091] The terminal assembly 315 according to this embodiment includes a terminal housing 320 and a terminal bus bar 340 attached to the terminal housing 320. The terminal housing 320 may be formed to surround the corners of the side surfaces of the module housing 200. In this case, the terminal housing 320 may have a bent shape. Specifically, the terminal housing 320 may be formed to surround both the top surface and the side surfaces of the module housing 200 at the same time.

[0092] 9, terminal bus bar 340 according to this embodiment includes first terminal bus bar 341 and second terminal bus bar 343, and first terminal bus bar 341 and second terminal bus bar 343 may have opposite polarities. Terminal bus bar 340 may have a structure including a first hole 340h1 formed in an inclined upper part and a second hole 340h2 formed in a lower part connected to the upper part and extending vertically (in the -z-axis direction). First hole 340h1 and second hole 340h2 may be regions through which fixing member 328 (FIG. 20) and connecting member 327, respectively, described below, pass.

[0093] According to this embodiment, the terminal housing 320 may have a first hole 320h formed therein, the terminal bus bar 340 may have a second hole 340h2 formed therein, and the stepped portion 200D may have a third hole 200DH formed therein. Here, the battery module 100 according to this embodiment may further include a connecting member 327 passing through the first hole 320h, the second hole 340h2, and the third hole 200DH.

[0094] 7 and 9, the coupling member 327 is formed of a conductive material and electrically connects the internal bus bar 330 (FIG. 21) of the first submodule 100a or the internal bus bar 330 (FIG. 21) of the second submodule 100b to the terminal bus bar 340. Specifically, the coupling member 327 includes a first coupling member 327a and a second coupling member 327b. The first coupling member 327a electrically connects the first terminal bus bar 341 to the first internal bus bar 330 (FIG. 21) of the first submodule 100a, and the second coupling member 327b electrically connects the second terminal bus bar 343 to the second internal bus bar 330 (FIG. 21) of the second submodule 100b. For example, the coupling member 327 may be a bolting coupling member.

[0095] The end plates 500 may be formed to be located on the first open side (x-axis direction) and the second open side (-x-axis direction) of the module housing 200 and to cover the sealing assembly 400. The end plate 500 located on the first open side of the module housing 200 may be a first end plate 510, and the end plate 500 located on the second open side of the module housing 200 may be a second end plate 550.

[0096] Such an end plate 500 can physically protect the battery cell assembly 120 and other electrical components from external impacts.

[0097] Each of the sub-battery modules constituting the battery module 100 of this embodiment will be described in more detail below.

[0098] Fig. 11 is a perspective view of a sub-module constituting a battery module according to one embodiment of the present invention. Fig. 12 is an exploded view of the sub-module of Fig. 11. Fig. 13 is a perspective view of the battery module of Fig. 8 excluding the module housing. Fig. 14 is a perspective view of the battery module of Fig. 13 to which a side plate has been added. Fig. 15 is an exploded perspective view of the battery module of Fig. 14. Fig. 16 is a view showing Fig. 14 being inserted into the module housing.

[0099] 11 to 16, a battery module 100 according to an embodiment of the present invention may include a first sub-module 100a and a second sub-module 100b. Specifically, the first sub-module 100a and the second sub-module 100b may be arranged in a row along the length direction (x-axis direction) of the battery cell assembly 120 to form a single battery module 100. In this case, the battery cell assemblies 120a and 120b included in the first and second sub-modules 100a and 100b, respectively, may be housed in a single module housing 200 at the same time.

[0100] The first sub-module 100a and the second sub-module 100b may each include a battery cell assembly 120 in which a plurality of battery cells are stacked, a bus bar structure 300 including a bus bar 330 electrically connected to the battery cell assembly 120, and a bus bar frame 310 covering the battery cell assembly 120 on at least one side.

[0101] That is, the first submodule 100a and the second submodule 100b each include the same configuration, and the following description will focus on the first submodule 100a.

[0102] 11 and 12, the first submodule 100a includes a first battery cell assembly 120a in which a plurality of battery cells 110 are stacked, a first busbar structure 300a covering the front (x-axis direction) and rear (-x-axis direction) of the first battery cell assembly 120a, and a first flexible printed circuit board (FPCB) 350a electrically connected to the first busbar structure 300a.

[0103] The first battery cell assembly 120a includes a first cooling fin 210a located between the plurality of first battery cells 110a, and a first compression pad 250a provided on one side of the first outermost battery cell 110a.

[0104] The first cooling fins 210a may be positioned between a plurality of first battery cells 110a. For example, the first cooling fins 210a may be positioned for every two first battery cells 110a. Specifically, one first cooling fin 210a and another first cooling fin 210a adjacent to each other may be positioned with two first battery cells 110a between them.

[0105] The first cooling fin 210a may include a first plate 211a in contact with one side of the first battery cell 110a. Here, the one side of the first battery cell 110a may be one surface of the battery cell 110 extending along the length direction (x-axis direction) of the first battery cell 110a.

[0106] One surface of the first plate 211a may contact one side of the first battery cell 110a facing the first surface of the first plate 211a. The other surface of the first plate 211a may contact one side of another adjacent first battery cell 110a facing the other side of the first plate 211a. In this case, although not shown in the drawings, an adhesive member may be interposed between the side of the first battery cell 110a and the first plate 211a, thereby adhesively fixing the first battery cell 110a and the first plate 211a. For example, the adhesive member may be insulating tape.

[0107] 15 (z-axis direction), and the bottom surface of the first plate 211a can contact the bottom surface (-z-axis direction) of the module housing 200. Therefore, the first cooling fin 210a can be fixed and positioned within the module housing 200, and therefore the first battery cell 110a bonded to the first cooling fin 210a can also be fixed and positioned within the module housing 200.

[0108] If the size of the first plate 211a is larger than the size of the first battery cell 110a, the upper and lower portions of the first battery cell 110a may be positioned at a certain height from the upper and lower portions of the module housing 200. Specifically, if the height (z-axis direction) of the first plate 211a is longer than the height (z-axis direction) of the first battery cell 110a, the first battery cell 110a may be adhesively fixed while positioned at the center of the first plate 211a.

[0109] The first cooling fin 210a may further include a first plate 211a and a first protrusion 213a protruding from one end of the first plate 211a. Specifically, referring to FIG. 12, the first cooling fin 210a may include a first plate 211a having a surface corresponding to or larger than one side of the first battery cell 110a, and a first protrusion 213a protruding from one end of the first plate 211a in a direction parallel to the stacking direction (y-axis direction) of the first battery cell assembly 120a.

[0110] The first protrusion 213a may be a region protruding in a direction perpendicular to the first plate 211a. For example, the first cooling fin 210a may be L-shaped. The first protrusion 213a may contact the upper surface and / or the lower surface of the module housing 200. Specifically, one surface of the first protrusion 213a may be positioned facing the upper surface or the lower surface of the first battery cell 110a, and the other surface of the first protrusion 213a may be positioned facing the upper surface or the lower surface of the module housing 200. This allows the first cooling fin 210a to be more firmly fixed and positioned within the module housing 200.

[0111] For example, one surface of the first protrusion 213a may face the first battery cell 110a. That is, one surface of the first protrusion 213a may face the lower portion of the first battery cell 110a, and the upper and lower portions of the first battery cell 110a may be adhesively fixed to the first plate 211a at a certain height from the upper and lower surfaces of the module housing 200. In other words, a certain space is provided between one surface of the first protrusion 213a and the lower portion of the first battery cell 110a, and between the upper surface of the module housing 200 and the upper portion of the first battery cell 110a, allowing a refrigerant (described below) to move between these spaces. In this case, the distance between one surface of the first protrusion 213a and the lower portion of the first battery cell 110a may correspond to the distance between the upper surface of the module housing 200 and the upper portion of the first battery cell 110a.

[0112] The other surface of the first protrusion 213a may contact the bottom of the module housing 200. Specifically, the other surface of the first protrusion 213a may contact and be adhesively fixed to the bottom of the module housing 200, thereby allowing the first cooling fin 210a to be more firmly fixed and positioned within the module housing 200. Although FIG. 12 has been described based on the protrusion of the cooling fin 210a being located between the bottom of the module housing 200 and the lower part of the first battery cell 110a, the protrusion of the cooling fin 210a may be located between the upper surface of the module housing 200 and the first battery cell 110a.

[0113] However, the shape of the first cooling fin 210a is not limited to that shown in this drawing, and may be a flat plate shape, or any shape is possible as long as it can contact the first battery cell 110a and fix the first battery cell 110a.

[0114] The first cooling fins 210a may be made of metal. Specifically, the first cooling fins 210a may be made of a metal with high thermal conductivity. Therefore, the first cooling fins 210a can directly receive heat generated in the first battery cell 110a during charging and discharging of the battery. When heat is generated, the heat is transferred to the first cooling fins 210a that contact the side of the first battery cell 110a, thereby performing primary cooling. A refrigerant (described below) then directly contacts the upper and lower parts of the first battery cell 110a, thereby performing secondary cooling. This allows direct cooling of the upper and lower parts of the battery cell, which have traditionally been relatively difficult to cool, thereby improving cooling efficiency.

[0115] The first compression pad 250a is located at the outermost periphery of the first battery cell assembly 120a and serves to absorb expansion of the first battery cell 110a due to charging and discharging. Specifically, the first compression pad 250a pushes out the side of the module housing 200 as the first battery cell 110a expands, thereby preventing the battery case of the first battery cell 110a from cracking and improving the safety of the battery module 100.

[0116] However, the first compression pad 250a is not limited to being positioned only at the outermost periphery of the first battery cell assembly 120a, but may also be positioned between the first battery cells 110a that constitute the first battery cell assembly 120a.

[0117] The first busbar structure 300a includes a first busbar frame 310a and a first busbar 330a attached to the first busbar frame 310a.

[0118] The first bus bar frame 310a may be positioned on the front and / or rear surface of the first battery cell assembly 120a along the x-axis direction to cover the front and / or rear surface of the first battery cell assembly 120a and guide the connection of the first battery cell assembly 120a to an external device. The first bus bar frame 310a may be positioned on the front (x-axis direction) and rear (negative x-axis) surface of the first battery cell assembly 120a. A first bus bar 330a may be attached to the first bus bar frame 310a. As a specific example, referring to FIGS. 10 to 13, the inner surface of the first bus bar frame 310a is connected to the front (x-axis direction) and rear (negative x-axis) surface of the first battery cell assembly 120a, and the outer surface of the first bus bar frame 310a is connected to the first bus bar 330a.

[0119] The first bus bar frame 310a may include an electrically insulating material, which may limit contact between the first bus bar 330a and other parts of the first battery cell 110a other than the part connected to the electrode lead (not shown), thereby preventing an electrical short circuit.

[0120] The first bus bar 330a may be attached to one surface of the first bus bar frame 310a and may be used to electrically connect the first battery cell assembly 120a or the first battery cell 110a to an external device circuit. The first bus bar 330a is located on the first bus bar frame 310a, and the first bus bar structure 300a is covered by the sealing assembly 400 and end plate 500 (described later), which can protect the first bus bar structure 300a from external impacts and minimize deterioration of durability due to external moisture.

[0121] The first bus bar 330a is electrically connected to the first battery cell assembly 120a through the electrode leads of the first battery cells 110a. Specifically, the electrode leads of the first battery cells 110a pass through slits formed in the first bus bar frame 310, then bend and connect to the first bus bar 330a. The first bus bar 330a connects the first battery cells 110a that make up the first battery cell assembly 120a in series or parallel.

[0122] The first flexible printed circuit board 350a is mounted to extend in the length direction (x-axis direction) of the first battery cell assembly 120a and is configured to sense the first battery cell 110a. That is, as shown in Figures 11 and 12, the first flexible printed circuit board 350a is attached to the top (z-axis direction) of the first battery cell assembly 120a and can sense electrical and thermal data of the first battery cell 110a. In addition, the first flexible printed circuit board 350a is bent toward the first bus bar frame 310a at an end of the first battery cell assembly 120a and is electrically connected to the first bus bar 330a.

[0123] The first sub-module 100a and the second sub-module 100b having the above-described configuration are arranged in a line and housed in one module housing 200 to form one battery module 100.

[0124] 13 to 16, the battery module 100 according to this embodiment has a structure in which a first sub-module 100a and a second sub-module 100b are arranged in a row along the longitudinal direction (x-axis direction) of the battery cells and housed in a single module housing 200. Specifically, a first busbar structure 300a located at the other end of the first sub-module 100a and a second busbar structure 300b located at one end of the second sub-module 100b are arranged facing each other to form the battery module 100 according to this embodiment. In this case, referring to FIG. 15, the first busbar structure 300a and the second busbar structure 300b are connected by a connection cable 380. The connection cable 380 will be described in more detail below with reference to FIG. 17.

[0125] 14 and 15, a battery module 100 formed by arranging a first sub-module 100a and a second sub-module 100b in a row may have side plates 230 on both sides thereof. According to this embodiment, the side plates 230 may have openings 232 formed therein. The connecting members 327 described in FIG. 9 pass through the first hole 320h, the second hole 340h2, and the third hole 200DH through the openings 232 to contact the internal bus bars 330 shown in FIG. 21, thereby electrically connecting the terminal bus bars 340 to the internal bus bars 330. While the openings 232 are shown to have a square shape in FIG. 14, the shape of the openings 232 is not limited thereto, and the shape of the openings 232 may be formed to correspond to the shape of the connecting members 327.

[0126] The side plate 230 may be a plate extending along the length direction (x-axis direction) of the battery module 100. Specifically, the length of the side plate 230 may correspond to the length of the battery module 100. In addition, the length of the side plate 230 may correspond to the sum of the lengths of the first sub-module 100a and the second sub-module 100b. Here, the term "corresponding in length" may mean that the length is the same as the length of the battery module or is the same value within an error range of about 10%.

[0127] The side plate 230 may be positioned to face the first outermost battery cell 110a of the first sub-module 100a and the second outermost battery cell 110b of the second sub-module 100b that constitute the battery module 100. The side plate 230 may also be positioned to face the first compression pad 250a of the first sub-module 100a and the second compression pad 250b of the second sub-module 100b that constitute the battery module 100.

[0128] The side plates 230 may be made of a rigid metal. The side plates 230 may protect the outermost battery cells 110a, 110b and compression pads 250a, 250b of the first sub-module 100a and the second sub-module 100b when the first sub-module 100a and the second sub-module 100b are inserted into the module housing 200. In addition, the battery cell assemblies 120a, 120b constituting the battery module 100 of this embodiment are longer than typical battery cell assemblies, and therefore may not be easily inserted into and assembled in the module housing 200. In this case, referring to FIGS. 14 to 16 , the side plates 230 guide the battery cell assemblies 120 constituting the battery module 100 of this embodiment when they are inserted into the module housing 200, allowing the battery module to be easily assembled without damaging the battery cells 110 and compression pads 250a, 250b.

[0129] Fig. 17 is a diagram showing the inside of region A1 in Fig. 13. Fig. 18 is a diagram showing region A2 in Fig. 13.

[0130] 17, a connection cable 380 is provided between the first sub-module 100a and the second sub-module 100b, thereby allowing the first sub-module 100a and the second sub-module 100b to be connected to each other for sensing voltage, etc. The connection cable 380 may be a flexible flat cable (FFC).

[0131] The connection cable 380 may connect a first flexible printed circuit board 350a located in the first submodule 100a to a second flexible printed circuit board 350b located in the second submodule 100b. In this case, the first bus bar frame 310a on which the first flexible printed circuit board 350a is located and the second bus bar frame 310b on which the second flexible printed circuit board 350b is located are each made of an insulating material, and may insulate other components except for the bus bar 330, the connection cable 380, and the flexible printed circuit boards 350.

[0132] As described above, by connecting the first flexible printed circuit board 350a and the second flexible printed circuit board 350b via the connection cable 380, the overall height of the battery module 100 can be reduced and the energy density of the battery itself can be increased. In addition, installation space for the battery module 100 can be secured, and when the battery module 100 is installed in a device such as an automobile, driving performance and fuel efficiency can be improved.

[0133] 13 and 18, internal bus bars 330 are disposed on the outermost sides of the first bus bar structure 300a and the second bus bar structure 300b of the first sub-module 100a and the second sub-module 100b to connect with the terminal assembly 315 of Fig. 16. As described in Figs. 8 and 9, the internal bus bar 330a of the first sub-module 100a or the internal bus bar 330b of the second sub-module 100b is electrically connected to the terminal bus bar 340 by a coupling member 327 made of a conductive material.

[0134] As described above, when the first sub-module 100a and the second sub-module 100b are electrically connected to the terminal assembly 315, the electrical connection relationship between the electrode leads, bus bars, etc. and the current transfer path will be described in detail below.

[0135] Fig. 19 is a perspective view showing a state in which a plurality of battery modules are electrically connected according to one embodiment of the present invention. Fig. 20 is an enlarged view of area P in Fig. 19. Fig. 21 is a view showing the electrical connection relationship in a battery module according to this embodiment. Fig. 22 is a view showing the current transfer path in a battery module.

[0136] 19 and 20 , a plurality of battery modules 100 are arranged along the y-axis direction, and a first battery module and a second battery module adjacent to each other along the y-axis direction each include a first terminal assembly 315a and a second terminal assembly 315b. The first and second terminal assemblies 315a and 315b each include a terminal housing 320a and 320b and a terminal bus bar 341 and 343 mounted within the terminal housing 320a and 320b, respectively. A connecting member 325 may be formed connecting the first terminal assembly 315a and the second terminal assembly 315b to electrically connect the adjacent battery modules 100a and 100b. The connecting member 325 may be fixed to the terminal bus bar 341 and 343 and / or the terminal housing 320 by a fixing member 328, such as a bolt.

[0137] The terminal assembly 315 according to this embodiment is disposed to vertically overlap the internal beam 1110 formed between the first battery module and the second battery module. For example, the terminal assembly 315 may be positioned on the internal beam 1110. By forming the terminal assembly 315 using the space above the internal beam 1110 in this manner, it is possible to improve space utilization and energy density.

[0138] 21 and 22, in the first submodule 100a and the second submodule 100b included in one battery module 100, a portion located on one side in the x-axis direction can be defined as a first end, a portion located on one side in the -x-axis direction can be defined as a second end, and a region where the first submodule 100a and the second submodule 100b face each other can be defined as a module extension A3. Hereinafter, the connection structure of the electrode leads and the current flow at the first end, the second end, and the module extension A3 will be described in detail.

[0139] For example, the first terminal bus bar 341, which is the positive electrode, is connected to the outermost battery cell of the first submodule 100a by the connecting member 327 shown in FIGS. 9 and 22, and adjacent electrode leads 130a1 and 130a2 are electrically connected to each other. At this time, the first terminal bus bar 341 is electrically connected to the internal bus bar 330 of the outermost battery cell by the connecting member 327. Multiple battery cells are electrically connected via the electrode leads 130a1 and 130a2 protruding from both ends of each battery cell. The pair of electrode leads 130a1 and 130a2 are welded together and electrically connected to one bus bar 330. This electrical connection allows current to flow within the first submodule 100a.

[0140] Similarly, the second terminal bus bar 343 is connected to the outermost battery cell of the second submodule 100b via the connecting members 327 shown in Figures 9 and 22, electrically connecting the adjacent electrode leads 130b1 and 130b2. At this time, the second terminal bus bar 343 is electrically connected to the internal bus bar 330 of the outermost battery cell via the connecting members 327. Multiple battery cells are electrically connected via the electrode leads 130b1 and 130b2 protruding from both ends of each battery cell. The pair of electrode leads 130b1 and 130b2 are welded together and electrically connected to one bus bar 330. This electrical connection allows current to flow within the second submodule 100b.

[0141] 22, the module connection portion A3 according to this embodiment is electrically connected to an external power source or another battery module adjacent to the battery module 100 of FIG. 22, or is connected to a BDU (Battery Disconnect Unit), thereby forming a high voltage (HV) connection structure with these. The connection structure may be a structure in which an internal bus bar 330 located at the outermost periphery of the battery cell is connected to a terminal assembly 315. The module connection portion A3 may be a region including the second end of the first sub-module 100a and the first end of the second sub-module 100b.

[0142] As explained above, when the electrical connections between the electrode leads 130a1, 130a2, 130b1, and 130b2 are formed, current can travel along the electrical connections between these electrode leads 130a1, 130a2, 130b1, and 130b2.

[0143] That is, the arrows in this drawing indicate the flow of current, and the current flow is not limited to that illustrated in this drawing, but can be anything as long as a skilled artisan can easily change the current flow by changing the electrical connection of the electrode lead.

[0144] FIG. 23 is a perspective view showing a first sealing assembly according to an embodiment of the present invention attached to one side of a module housing.

[0145] 23, a battery module 100 according to an embodiment of the present invention may include a first sealing assembly 410 attached to one open side of a module housing 200. Specifically, in the battery module 100 according to this embodiment, a bus bar structure 300 electrically connected to the battery cell assemblies may be located on one open side of the module housing 200, and the first sealing assembly 410 may be attached to cover the bus bar structure 300.

[0146] The first sealing assembly 410 may include a first sealing cover 420 that covers one open side of the module housing 200, an inlet 421 that is a hole formed in the first sealing cover 420, and a module connector 430 that is attached to one area of ​​the first sealing cover 420.

[0147] The first sealing cover 420 is a plate that covers one open side of the module housing 200, and may have a size corresponding to the size of the one open side of the module housing 200. That is, the first sealing cover 420 may be attached to the module housing 200 while covering the one open side of the module housing 200. For example, the first sealing cover 420 may be mated and coupled to the module housing 200.

[0148] The inlet 421 may be configured to allow a refrigerant to flow into the battery module 100. The inlet 421 may be a hole formed in one area of ​​the first sealing cover 420. The inlet 421 may be a hole including a protrusion that protrudes from the first sealing cover 420 toward the outer surface (x-axis direction) of the first sealing cover 420. That is, the inlet 421 may be a hole including a protrusion that protrudes in the opposite direction from the area where the module housing 200 is disposed. The protrusion may be positioned to pass through an inlet opening 540 formed in a first end plate 510, which will be described later.

[0149] The inlet 421 may be located closer to the bottom (-z-axis direction) than the top of the first sealing assembly 410. Specifically, the inlet 421 may be located lower than the center based on the height (z-axis direction) of the first sealing assembly 410. This is because, after the refrigerant flows into the interior of the module housing 200, the refrigerant fills the interior of the module housing 200 from bottom to top without any gaps, thereby improving the cooling performance of the battery cell assemblies and other electrical components located inside the module housing 200.

[0150] The module connector 430 detects and controls phenomena such as overvoltage, overcurrent, and overheating of the battery cells. The module connector 430 is for a low voltage (LV) connection, which may refer to a sensing connection for detecting and controlling the voltage of the battery cells. Voltage information and temperature information of the battery cells are transmitted to an external BMS (Battery Management System) via the module connector 430.

[0151] The module connector 430 may be attached to the first sealing cover 420. At this time, the module connector 430 may be attached by being coupled to the first sealing cover 420 via a coupling member 440. At least a portion of the module connector 430 may be exposed to the outside of an end plate 510, which will be described later, and the end plate 510 may have a module connector opening 530 for this purpose.

[0152] Figure 24 is a diagram showing the process of assembling the first sealing assembly of Figure 23. Figure 24(a) is a diagram showing the module connector being coupled to the first sealing cover. Figure 24(b) is a diagram showing the sensing unit being coupled to the first sealing cover. Figure 24(c) is a diagram showing both the module connector and the sensing unit coupled to the first sealing cover.

[0153] Referring to FIG. 24, a module connector 430 is attached to one side of the first sealing assembly 410, and a sensing unit 360 is attached to the other side of the first sealing assembly 410, and the module connector 430 and the sensing unit 360 are electrically connected to each other.

[0154] 24(a), a module connector 430 can be attached to one surface of the first sealing cover 420. Specifically, the module connector 430 can be attached to an outer surface 420a of the first sealing cover 420. The outer surface 420a of the first sealing cover 420 is a surface that faces an end plate 510 (see FIG. 26), which will be described later, and may be a surface that does not face the module housing 200 (see FIG. 23).

[0155] The module connector 430 may be mounted and positioned in a fourth region A4, which is a region of the outer surface 420a of the first sealing cover 420. The fourth region A4 is a region corresponding to the size of the module connector 430. A hole penetrating the first sealing cover 420 may be provided in the center of the fourth region A4, and a groove into which the coupling member 440 may be mounted may be provided at the apex of the fourth region A4. In this case, the coupling member 440 may be provided at the apex of the module connector 430, and the coupling member 440 may be located in a region corresponding to the groove in the fourth region A4. Therefore, the coupling member 440 can be coupled to the groove in the fourth region A4, thereby allowing the module connector 430 to be mounted in the fourth region A4.

[0156] The coupling member 440 can be any member that couples and fixes the module connector 430 to the fourth area A4, and may be, for example, a bolt and nut or a rivet.

[0157] 24(b) and 24(c), a sensing unit 360 may be attached to the other surface of the first sealing cover 420. Specifically, the sensing unit 360 may be attached to an inner surface 420b of the first sealing cover 420. The inner surface 420b of the first sealing cover 420 is the surface that faces the module housing 200 (see FIG. 23), and may be the surface that does not face an end plate 510 (see FIG. 26), which will be described later.

[0158] The sensing unit 360 may include a sensing printed circuit board 361 and a sensing cable 363 electrically connected to the sensing printed circuit board 361. The sensing printed circuit board 361 is electrically connected to the module connector 430. The sensing printed circuit board 361 may be located in an area corresponding to the module connector 430. Specifically, the sensing printed circuit board 361 may be located in the fourth area A4. The sensing printed circuit board 361 may be located and electrically connected to the module connector 430 through a hole in the fourth area A4.

[0159] The sensing cable 363 is a cable electrically connected to the sensing printed circuit board 361 and may include a cable connection portion 363a and a cable extension portion 363b.

[0160] The cable connection part 363a may be connected to the sensing printed circuit board 361 and may be positioned in contact with the inner surface 420b of the first sealing cover 420. The cable connection part 363a is fixedly positioned in contact with the inner surface 420b of the first sealing cover 420 and does not move freely within the battery module 100, thereby preventing damage to components.

[0161] Specifically, the cable connection portion 363a may be positioned to extend from the sensing printed circuit board 361 to the lower portion of the first sealing cover 420 and bent and extended from the lower portion of the first sealing cover 420. In this case, the portion bent from the lower portion of the first sealing cover 420 and extended from the cable connection portion 363a may be defined as a cable extension portion 363b.

[0162] The cable extension 363b can be electrically connected to a flexible printed circuit board 350 located on the bus bar structure, which will be described below with reference to FIG.

[0163] Figure 25 is a diagram showing a process in which the first sealing assembly of Figure 23 is attached to one side of the module housing. Figure 25(a) is a diagram showing that the sensing cable is electrically connected to the flexible printed circuit board. Figure 25(b) is a diagram showing that the first sealing assembly is coupled to the module housing. Figure 25(c) is a diagram showing that the first sealing assembly and the module housing are sealed.

[0164] 24(c) and 25(a), the sensing cable 363 is electrically connected to the flexible printed circuit board 350 located on the bus bar structure. In this case, the sensing cable 363 can transmit voltage information, temperature information, and the like of the battery cells acquired from the flexible printed circuit board 350 to the sensing printed circuit board 361. In this case, the sensing printed circuit board 361 can transmit the battery cell information, and the like, acquired from the flexible printed circuit board 350 to the module connector 430. That is, the sensing unit 360 can transmit the battery cell data acquired from the flexible printed circuit board 350 to the module connector 430.

[0165] Therefore, the module connector 430 can transmit data acquired from the flexible printed circuit board 350 and the sensing unit 360 to a BMS (Battery Management System), and the BMS can control the charging and discharging of the battery cells based on the collected voltage data.

[0166] 25(a) and 25(b), the first sealing cover 420 can be attached to the module housing 200 while covering one open side of the module housing 200. For example, the first sealing cover 420 can be mated with the module housing 200. In this case, the periphery of the first sealing cover 420 may include a protrusion that protrudes in a direction toward mating with the module housing 200. In this case, the periphery of the module housing 200 that is mated with the first sealing cover 420 may be formed with a step so that the periphery protrusion of the first sealing cover 420 can be mated with it. Therefore, the first sealing cover 420 and the module housing 200 can be mated with each other.

[0167] 25(c), when the first sealing cover 420 and the open side of the module housing 200 are coupled to each other, a first sealing member 610 may be interposed along the periphery of the first sealing cover 420 and the module housing 200. This is because, when the first sealing cover 420 and the module housing 200 are coupled, minute gaps may occur between them due to assembly tolerances, and the first sealing member 610 seals these gaps to improve the sealing force of the battery module 100. This prevents leakage of the refrigerant located inside the battery module 100, prevents leakage of gas generated inside the battery module 100, and controls the direction of gas discharge, thereby improving the safety of the battery module 100. Although the first sealing member 610 is shown in FIG. 20(c) as being exposed to the outside, the first sealing member 610 may be interposed between the module housing 200 and the first sealing cover 420.

[0168] In this case, the first sealing member 610 may be, for example, an adhesive tape.

[0169] Although not shown in the drawings, after the first sealing assembly 410 is coupled to the module housing 200 and the periphery is sealed by the first sealing member 610, any gaps present in the first sealing assembly 410 can be sealed with a second sealing member 620 (see FIGS. 27 and 28). This is because the second sealing member 620 is used to seal portions of the first sealing assembly 410 other than the periphery that cannot be sealed by the first sealing member 610, thereby further improving the sealing force of the battery module 100. The second sealing member 620 will be described in more detail with reference to FIG.

[0170] FIG. 26 is an exploded perspective view showing a first end plate attached to a first sealing assembly according to one embodiment of the present invention.

[0171] Referring to FIG. 26, in the battery module 100 according to an embodiment of the present invention, the first end plate 510 may be positioned to cover the first sealing assembly 410.

[0172] The first end plate 510 can include a terminal bus bar opening 520 , a module connector opening 530 and an inlet opening 540 .

[0173] Terminal bus bar opening 520 is an opening provided in first end plate 510. Specifically, terminal bus bar opening 520 may be an opening formed in an area corresponding to the position of terminal bus bar 340 provided in first sealing assembly 410.

[0174] The terminal bus bar opening 520 is a protrusion that protrudes from the first end plate 510 toward the outside of the battery module 100, and may be configured such that only the upper surface of the protrusion is open. In this case, a portion of the terminal bus bar 340 may be exposed to the outside from the upper surface of the protrusion.

[0175] The size of the terminal bus bar opening 520 is mainly determined by the size around the terminal bus bar 340. However, for ease of assembly or for reasons of the manufacturing process, the size of the terminal bus bar opening 520 may be larger than the size of the exposed portion of the terminal bus bar 340, and in this case, a gap may occur between the terminal bus bar opening 520 and the terminal bus bar 340 exposed to the outside.

[0176] The module connector opening 530 and the inlet opening 540 are openings provided in the first end plate 510, that is, holes penetrating the first end plate 510. Specifically, the module connector opening 530 may be an opening formed in an area corresponding to the position of the module connector 430 provided in the first sealing assembly 410, and the inlet opening 540 may be an opening formed in an area corresponding to the position of the outlet 461 provided in the first sealing assembly 410. In this case, the module connector 430 is positioned passing through the module connector opening 530, and the inlet 421 is positioned passing through the inlet opening 540, so that at least a portion of the module connector 430 and the inlet 421 can be exposed to the outside.

[0177] The sizes of the module connector opening 530 and the inlet opening 540 are determined mainly by the size of the periphery of the module connector 430 and the inlet 421. However, for ease of assembly or for reasons of the manufacturing process, the sizes of the module connector opening 530 and the inlet opening 540 may be larger than the size of the exposed portions of the module connector 430 and the inlet 421. In this case, a gap may occur between the module connector 430 and the inlet 421 that are exposed outside the module connector opening 530 and the inlet opening 540.

[0178] Terminal bus bar 340 and module connector 430 are exposed to the outside through terminal bus bar opening 520 and module connector opening 530, respectively, facilitating HV and LV connections to external electrical components, thereby improving the efficiency of the assembly process.

[0179] Because the inlet 421 is exposed to the outside of the battery module 100 through the inlet opening 540, when the refrigerant is injected into the module housing 200 through the inlet 421, leakage of the refrigerant between the first sealing assembly 410 and the first end plate 510 can be prevented. Therefore, the refrigerant does not come into contact with the terminal bus bar 340 or the module connector 430, which are electrically connected to the outside. In other words, a short circuit between the above components does not occur, and the safety of the battery module 100 can be improved.

[0180] A third sealing member 630 may be interposed between the first end plate 510 and the first sealing assembly 410 .

[0181] The third sealing member 630 may have a shape corresponding to the periphery of the first sealing assembly 410 or the periphery of the first end plate 510. The third sealing member 630 may be a resin that is applied to correspond to the periphery of the first sealing assembly 410 or the periphery of the first end plate 510 and then hardened. Specifically, the third sealing member 630 may be applied to the first groove 411, which is a groove formed along the periphery of the first sealing assembly 410, and hardened after the first sealing assembly 410 and the first end plate 510 are joined together. For example, the third sealing member 630 may be an epoxy resin.

[0182] That is, by interposing the third sealing member 630 between the first sealing assembly 410 and the first end plate 510, the first sealing assembly 410 and the first end plate 510 can be joined without any gaps formed due to assembly tolerances.

[0183] Therefore, the sealing force of the battery module 100 is improved, and leakage of the refrigerant located inside the battery module 100 is prevented, thereby improving the cooling performance of the battery module 100. In addition, the venting direction can be controlled so that venting gas generated inside the battery module 100 above a certain temperature and pressure is not discharged to the outside through the gap, thereby improving the safety of the battery module 100.

[0184] However, the type and method of forming the third sealing member 630 are not limited to those described above, and it may be in the form of a gasket made of an elastic material, or any other material that can serve to seal the first sealing assembly 410 and the first end plate 510.

[0185] Fig. 27 is a view of the first end plate attached to the first sealing assembly as viewed from the -x-axis direction of Fig. 26. Fig. 28 is a view showing area A5 cut along B-B' in Fig. 27.

[0186] 27 and 28, it can be seen that the first sealing member 610 and the third sealing member 630 are located along the periphery of the first sealing assembly 410, and the second sealing member 620 is located in one area of ​​the first sealing assembly 410.

[0187] 28 regarding the second sealing member 620, the second sealing member 620 may be positioned in an area excluding the peripheral area of ​​the first sealing assembly 410. That is, the second sealing member 620 may seal the remaining area of ​​the first sealing assembly 410 that the first sealing member 610 and the third sealing member 630 cannot cover. Specifically, the second sealing member 620 may seal an area of ​​the first sealing assembly 410 where there is a gap. However, the area where the second sealing member 620 is positioned is not limited to the area shown in this drawing. For example, the second sealing member 620 may seal a portion of the area of ​​the first sealing assembly 410 where the module connector 430 is coupled where there is a gap.

[0188] As a result, not only the edge portion of the first sealing assembly 410 but also the portion where a gap is located is sealed by the second sealing member 620, thereby improving the sealing force of the battery module 100 and preventing leakage of the refrigerant inside the battery module 100, thereby improving the cooling performance of the battery module 100. In addition, gas generated inside the battery module 100 above a certain temperature and pressure is not discharged between the gap between the first sealing assembly 410 and the first end plate 510, thereby improving the safety of the battery module 100.

[0189] FIG. 29 is a view showing that a second sealing assembly according to an embodiment of the present invention is attached to the other side of the module housing.

[0190] 29, a battery module 100 according to an embodiment of the present invention may include a second sealing assembly 450 attached to the other open surface of the module housing 200. Specifically, in the battery module 100 according to this embodiment, the bus bar structure 300 electrically connected to the battery cell assemblies may be located on the other open surface of the module housing 200, and the second sealing assembly 450 may be attached to cover the bus bar structure 300.

[0191] The second sealing assembly 450 may include a second sealing cover 460 which is a plate that covers the other open side of the module housing 200 , and an outlet 461 which is a hole formed in the second sealing cover 460 .

[0192] The second sealing cover 460 is a plate that covers the other open side of the module housing 200, and may have a size that corresponds to the size of the other open side of the module housing 200. Here, "corresponding in size" may mean that the size is the same as the size of the other open side of the module housing 200, or that the size is within an error range of about 10% based on the same size. That is, the second sealing cover 460 may be attached to the module housing 200 while covering the open side of the module housing 200. For example, the second sealing cover 460 may be mated with the module housing 200.

[0193] The outlet 461 can discharge the refrigerant that flows into the battery module 100 via the inlet to the outside of the battery module 100.

[0194] The outlet 461 may be a hole formed in a certain region of the second sealing cover 460. The outlet 461 may be a hole including a protrusion that is a portion that protrudes toward the outer surface (negative x-axis direction) of the second sealing cover 460. That is, the outlet 461 may be a hole including a protrusion that is a portion that protrudes in the opposite direction of the module housing 200. The protrusion may be positioned to pass through an outlet opening 560 formed in the second end plate 550, which will be described later.

[0195] The outlet 461 may be located near the top (z-axis direction) of the second sealing assembly 450. Specifically, the outlet 461 may be located above the center based on the height of the second sealing assembly 450. However, the location of the outlet 461 is not limited thereto.

[0196] When the second sealing assembly 450 and the open side of the module housing 200 are coupled to each other, a first sealing member 610 may be interposed along the periphery of the second sealing cover 460 and the module housing 200. This is because, when the second sealing cover 460 and the module housing 200 are coupled, minute gaps may occur between them due to assembly tolerances, and these gaps are sealed with the sealing member 600 to improve the sealing force of the battery module 100. Therefore, leakage of the refrigerant located inside the battery module 100 can be prevented, and leakage of venting gas generated inside the battery module 100 can also be prevented and the direction of gas discharge can be controlled, thereby improving the safety of the battery module 100.

[0197] In this case, the first sealing member 610 may be, for example, an adhesive tape.

[0198] Although not shown in the drawings, after the second sealing assembly 450 is coupled to the module housing 200 and the periphery is sealed with the first sealing member 610, any gaps present on the second sealing assembly 450 can be sealed with the second sealing member 620 (see FIG. 32). This is because the second sealing member 620 is used to seal portions of the second sealing assembly 450 other than the periphery that cannot be sealed with the first sealing member 610, thereby further improving the sealing force of the battery module 100. The second sealing member 620 will be described in more detail with reference to FIG.

[0199] FIG. 30 is an exploded perspective view showing a second end plate attached to a second sealing assembly according to one embodiment of the present invention.

[0200] Referring to FIG. 30, in the battery module 100 according to an embodiment of the present invention, the second end plate 550 may be positioned to cover the second sealing assembly 450 .

[0201] The second end plate 550 may include an outlet opening 560 .

[0202] The outlet opening 560 is an opening provided in the second end plate 550, and is a hole passing through the second end plate 550. Specifically, the outlet opening 560 may be an opening formed in an area corresponding to the position of the outlet 461 provided in the second sealing assembly 450. In this case, the outlet 461 is positioned passing through the outlet opening 560, so that at least a portion of the outlet 461 can be exposed to the outside.

[0203] The size of the outlet opening 560 may be determined mainly by the size of the circumference of the outlet 461. However, for ease of assembly or for reasons of the manufacturing process, the size of the outlet opening 560 may be larger than the size of the exposed portion of the outlet 461, and in this case, a gap may occur between the outlet 461 exposed outside the outlet opening 560.

[0204] Since the outlet 461 is exposed to the outside of the battery module 100 through the outlet opening 560, when the refrigerant inside the module housing 200 is discharged through the outlet 461, the refrigerant can be prevented from leaking between the second sealing assembly 450 and the second end plate 550. Therefore, since there is no contact with other electrical components, a short circuit does not occur, and the safety of the battery module 100 can be improved.

[0205] A third sealing member 630 may be interposed between the second sealing assembly 450 and the second end plate 550 .

[0206] The third sealing member 630 may have a shape corresponding to the periphery of the second sealing assembly 450 or the periphery of the second end plate 550. The third sealing member 630 may be a resin that is applied to correspond to the periphery of the second sealing assembly 450 or the periphery of the second end plate 550 and then cured. Specifically, the third sealing member 630 may be applied to a second groove 451 that is a groove formed along the periphery of the second sealing assembly 450, and may be cured after the second sealing assembly 450 and the second end plate 550 are joined. For example, the third sealing member 630 may be an epoxy resin.

[0207] That is, by interposing the third sealing member 630 between the second sealing assembly 450 and the second end plate 550, the second sealing assembly 450 and the second end plate 550 can be joined without any gaps formed due to assembly tolerances.

[0208] Therefore, the sealing force of the battery module 100 is improved, and the cooling performance is improved by preventing leakage of the refrigerant located inside the battery module 100. In addition, the venting direction can be controlled so that venting gas generated inside the battery module 100 above a certain temperature and pressure is not discharged to the outside through the gap, and the safety of the battery module 100 can be improved.

[0209] The type and method of forming the third sealing member 630 are not limited to those described above, and may be a gasket-like form made of an elastic material, or any other material that can serve to seal the second sealing assembly 450 and the second end plate 550.

[0210] Fig. 31 is a view of the second end plate attached to the second sealing assembly as viewed from the -x-axis direction of Fig. 30. Fig. 32 is a view showing area A6 taken along CC' in Fig. 31.

[0211] 31 and 32, it can be seen that the first sealing member 610 and the third sealing member 630 are located along the periphery of the second sealing assembly 450, and the second sealing member 620 is located in one area of ​​the second sealing assembly 450.

[0212] 32 regarding the second sealing member 620, the second sealing member 620 may be located in an area excluding the peripheral area of ​​the second sealing assembly 450. That is, the second sealing member 620 may seal the remaining area of ​​the second sealing assembly 450 that cannot be covered by the first sealing member 610 and the third sealing member 630. Specifically, the second sealing member 620 may seal an area where there is a gap in the first sealing assembly 410. However, the area where the second sealing member 620 is located is not limited to the area shown in this drawing.

[0213] As a result, not only the peripheral portion of the second sealing assembly 450 but also the portion where the gap is located is sealed by the second sealing member 620, thereby improving the sealing force of the battery module 100 and preventing leakage of the refrigerant inside the battery module 100, thereby improving the cooling performance of the battery module 100. In addition, gas generated inside the battery module 100 above a certain temperature and pressure is not discharged between the gap between the second sealing assembly 450 and the second end plate 550, thereby improving the safety of the battery module 100.

[0214] Fig. 33 is an exploded perspective view of a second sealing assembly according to another embodiment of the present invention, and Fig. 34 is a view of Fig. 33 as seen from the -y-axis direction.

[0215] 33 and 34, a second sealing assembly 450 according to another embodiment of the present invention may further include an outlet 461 and a module venting unit 470. Since the outlet 461 is the same as described above, the following description will focus on the module venting unit 470.

[0216] The module venting unit 470 can discharge gas generated from inside the battery module 100 above a certain temperature and pressure to the outside. Specifically, the module venting unit 470 can discharge gas inside the battery module 100 to the outside and prevent leakage of the refrigerant inside the battery module 100.

[0217] The module venting portion 470 is provided in an area of ​​the second sealing cover 460. The module venting portion 470 may include a venting hole 471, a membrane 473, a fixed cover 475, and a venting protrusion 477.

[0218] The venting hole 471 may be a passage through which gas generated inside the battery module 100 moves to the outside. The venting hole 471 may be at least one hole provided in one region of the second sealing cover 460. The venting hole 471 is structurally connected to a module connection part 472, which will be described later with reference to FIG. 35, which will be described in detail with reference to FIG.

[0219] The membrane 473 may be a membrane that can discharge gas inside the battery module 100 to the outside through the venting holes 471 but prevent the refrigerant from leaking to the outside. The membrane 473 may be positioned between the inner surface 460b of the second sealing cover 460 and the fixing cover 475. The membrane 473 may be positioned in contact with the inner surface 460b of the second sealing cover 460. In this case, one surface of the membrane 473 may be positioned in contact with and fixed to the inner surface 460b of the second sealing cover 460, and the other surface of the membrane 473 may be positioned in contact with and fixed to one surface of the fixing cover 475.

[0220] The fixed cover 475 allows the gas and refrigerant located inside the battery module 100 to pass through temporarily. The fixed cover 475 may be located closest to the battery cell assemblies.

[0221] The fixed cover 475 may be positioned in contact with the membrane 473. Specifically, one surface of the fixed cover 475 is adhered and fixed to the other surface of the membrane 473. In this case, the size of the fixed cover 475 may correspond to the size of the membrane 473 or may be larger than the size of the membrane 473.

[0222] The fixed cover 475 may have a shape in which holes are provided in a flat plate, but the holes do not have to be located in the peripheral region of the fixed cover 475.

[0223] The peripheral region of the fixed cover 475 may contact the membrane 473 and / or the inner surface 460b of the second sealing cover 460. In this case, although not shown in the drawings, an adhesive member may be interposed along the peripheral region of the fixed cover 475, and the fixed cover 475 may be fixed and positioned on the second sealing assembly 450 by the adhesive member. Holes formed in the fixed cover 475 allow gas and refrigerant located inside the battery module 100 to move to the membrane 473. There may be at least one hole.

[0224] The venting protrusion 477 may be a region that protrudes from a region corresponding to the module venting portion 470 toward the outside (x-axis direction) of the battery module 100. The venting protrusion 477 may be a region that protrudes from a region where the venting hole 471 is provided toward the outside. A portion of the venting protrusion 477 may pass through the second end plate 550 and be exposed to the outside, thereby allowing the venting gas to be completely discharged to the outside of the battery module 100. This will be described in detail with reference to FIG. 35.

[0225] FIG. 35 is a view showing the second sealing assembly of FIG. 33 mated with a second end plate.

[0226] Referring to FIG. 35, when the second end plate 550 is attached over the second sealing assembly 450, at least a portion of the outlet 461 and the module venting portion 470 can be exposed to the outside through the second end plate 550.

[0227] Specifically, the outlet 461 may be partially exposed to the outside through an outlet opening 560 provided in the second end plate 550, and the module venting portion 470 may be partially exposed to the outside through a venting opening 570 provided in the second end plate 550.

[0228] The outlet 461 and the outlet opening 560 are the same as those described in detail in FIG. 26, so a description thereof will be omitted and only the module venting section 470 and the venting opening 570 will be described in detail.

[0229] The module venting portion 470 includes a venting protrusion 477 that protrudes in the opposite direction from the module housing 200, and the venting protrusion 477 is provided with a module connection portion 472.

[0230] The module connection portion 472 is a hole connected to the above-described venting hole 471, and like the venting protrusion 477, can penetrate the second end plate 550 and be partially exposed to the outside. The module connection portion 472 is connected to the pack venting portion 2000 (FIG. 37) of the battery pack, which will be described later, and can allow venting gas that has migrated through the venting hole 471 to be discharged to the outside. That is, since at least a portion of the module connection portion 472 penetrates the second end plate 550 and is exposed to the outside, assembly with the pack venting portion 2000 is facilitated. This improves the efficiency of the assembly process. In addition, the venting gas discharged through the module connection portion 472 does not remain in the space between the second end plate 550 and the second sealing assembly 450. As a result, venting gas does not remain inside the battery module 100, thereby improving the safety of the battery module 100.

[0231] The venting opening 570 is an opening provided in the second end plate 550, and is a hole penetrating the second end plate 550. Specifically, the venting opening 570 may be an opening formed in an area corresponding to the position of the venting protrusion 477 provided in the second sealing assembly 450. In this case, the venting protrusion 477 is positioned together with the module connecting portion 472 through the venting opening 570, so that at least a portion of the venting protrusion 477 and the module connecting portion 472 can be exposed to the outside.

[0232] The size of the venting opening 570 may be determined mainly by the size of the circumference of the venting protrusion 477. However, for ease of assembly or for reasons of the manufacturing process, the size of the venting opening 570 may be larger than the size of the exposed portion of the venting protrusion 477, and in this case, a gap may occur between the venting opening 570 and the venting protrusion 477 exposed to the outside.

[0233] Fig. 36 is a perspective view showing the inside of a battery pack according to an embodiment of the present invention. Fig. 37 is a view showing a pack venting portion according to an embodiment of the present invention. Fig. 38 is a cross-sectional view taken along the line DD' in Fig. 36. Fig. 39 is a perspective view of Fig. 36 as seen from the -z axis direction.

[0234] 36 to 39, in a battery pack 1000 according to one embodiment of the present invention, a plurality of battery modules 100 are mounted in a space defined by internal beams 1110 within a lower pack frame 1100, and the plurality of battery modules 100 are connected to a pack venting portion 2000. Specifically, a module venting portion 470 is provided at an end of the plurality of battery modules 100, and the module venting portion 470 is connected to the pack venting portion 2000.

[0235] The pack venting section 2000 may include a direction adjusting section 2100 , a pack connection section 2200 and an exhaust port 2300 .

[0236] 37 to 39, the direction adjuster 2100 may be a pipe that controls the direction of the venting gas so that the venting gas is discharged to the outside of the battery pack 1000. Specifically, the direction adjuster 2100 may be a pipe that is connected to the outlet 2300 with one end closed and the other end open.

[0237] The direction adjusting unit 2100 may be located inside the side pack frame 1150. The direction adjusting unit 2100 may extend along the side pack frame to the exhaust port 2300 and exhaust the venting gas to the outside through the exhaust port 2300.

[0238] The direction adjusting part 2100 may be located between the outer surface 1151 and the inner surface 1152 of the side pack frame 1150. A space is formed between the outer surface 1151 and the inner surface 1152 of the side pack frame 1150, and the direction adjusting part 2100 is located in this space. In this case, referring to FIG. 34, the diameter of the direction adjusting part 2100 may be the same as or smaller than the width (w1) of the side pack frame 1150. However, the position of the direction adjusting part 2100 is not limited thereto, and for example, the direction adjusting part 2100 may be located outside the side pack frame 1150 and extend along the side pack frame 1150.

[0239] The direction adjuster 2100 may be connected to the pack connection part 2200. The pack connection part 2200 may be a region protruding from one surface of the direction adjuster 2100 toward the module venting part 470. In this case, referring to FIG. 37 , the direction adjuster 2100 and the pack connection part 2200 may have a manifold shape.

[0240] The pack connection part 2200 may be configured to connect the module venting part 470 and the pack venting part 2000. That is, the pack connection part 2200 may be configured to connect the module venting part 470 and the direction adjusting part 2100. Specifically, the pack connection part 2200 is connected to the module venting part 470 to allow gas generated inside the battery module 100 to move to the pack venting part 2000. In this case, the pack connection part 2200 is connected to the module venting part 470 by a fitting connection, but the present invention is not limited to this.

[0241] The module venting portion 470 includes a module connection portion 472 that is exposed to the outside of the battery module 100 and is connected to the pack connection portion 2200, and a protrusion 477 that protrudes and surrounds the module connection portion 472. The protrusion 477 may be a region that surrounds the module connection portion 472 and protrudes from the second sealing assembly 450 in the opposite direction to the module housing 200. The protrusion 477 physically protects the module connection portion 472 and can also guide the pack connection portion 2200 to be connected to the module connection portion 472.

[0242] When the direction adjusting unit 2100 is positioned inside the side pack frame 1150, the pack connecting part 2200 may be positioned to penetrate the side pack frame 1150. That is, the pack connecting part 2200 may be positioned to penetrate the inner surface 1152 of the side pack frame 1150. In this case, a hole may be formed in an area of ​​the inner surface 1152 of the side pack frame 1150 corresponding to the area where the pack connecting part 2200 is provided. The hole may correspond to the size of the pack connecting part 2200, or may be larger than the size of the pack connecting part 2200 for ease of assembly. Here, the term "corresponding in size" may mean that the sizes are the same or have an error range of about 10% based on the same value as the size of the pack connecting part 2200.

[0243] The exhaust port 2300 is connected to the direction adjusting unit 2100 and can exhaust the gas that has moved through the direction adjusting unit 2100 to the outside of the battery pack 1000 .

[0244] The exhaust port 2300 may be provided in the side pack frame 1150. Referring to Fig. 39, the exhaust port 2300 is provided in an area of ​​the side pack frame 1150. Specifically, the exhaust port 2300 is provided in an area of ​​the side pack frame 1150 where the pack connection part 2200 is not located. This is to relatively reduce the strength and temperature of the venting gas before discharging it to the outside by setting the distance between the direction adjuster 2100 and the exhaust port 2300, i.e., the travel path of the venting gas, as long as possible.

[0245] The outlet 2300 may be a member that opens and closes or bursts in response to the pressure inside the battery pack 1000 .

[0246] For example, the vent port 2300 may be connected to the inside of the battery pack 1000, but may be configured as a member that opens to the outside only when the pressure inside the battery pack 1000 exceeds a certain pressure, and closes when the pressure falls below the certain pressure. For example, the vent port 2300 may be a relief valve. However, the vent port 2300 is not limited thereto, and any member that can open and close depending on the pressure of the battery pack 1000 is included in this embodiment.

[0247] As another example, the exhaust port 2300 may rupture when the pressure inside the battery pack 1000 reaches a certain level or above. More specifically, the exhaust port 2300 may include a rupture surface (not shown) configured to rupture when the pressure of the inflowing gas reaches a certain level or above, like a rupture disk. However, the structure of the exhaust port 2300 is not limited thereto, and any structure that communicates with the direction adjuster 2100 and allows the internal gas to be discharged to the outside is included in this embodiment.

[0248] As described above, high-temperature gas and / or flame generated inside the battery module 100 moves to the pack venting unit 2000 through the module venting unit 470, and can be discharged to the outside of the battery pack 1000. Specifically, high-temperature gas and / or flame flowing in through the pack connection unit 2200 moves inside the direction adjustment unit 2100, and can finally be discharged to the outside through the exhaust port 2300 from the side pack frame 1150 where the exhaust port 2300 is located.

[0249] As a result, the side pack frame 1150 and the direction adjusting unit 2100 provided inside the side pack frame 1150 can form a venting path, and high-temperature gas and / or flame moving along the venting path is cooled by contacting the inner surface of the direction adjusting unit 2100, and the cooled gas and / or flame is safely discharged to the outside through the exhaust port 2300. Therefore, the safety of the battery pack 1000 can be improved.

[0250] The battery module and the battery pack including the same can be applied to various devices, including transportation means such as electric bicycles, electric cars, and hybrid cars, but the present invention is not limited thereto and can be applied to various devices that can use the battery module and the battery pack including the same, which also fall within the scope of the present invention.

[0251] 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]

[0252] 100 battery modules 100a First submodule 100b Second submodule 120 Battery Cell Assembly 130a, 130b, 130a1, 130a2, 130b1, 130b2 electrode leads 200 Module Housing 200D step 210a Cooling fin 230 Side Plate 300 Busbar structure 315 Terminal Assembly 320 Terminal Housing 325 Connecting members 327 Connecting members 328 Fixing member 330 Busbar 340 Terminal Busbar 340h1, 340h2 1st and 2nd holes 200DH 3rd hole 350 Flexible Printed Circuit Board 360 Sensing Unit 363 Sensing Cable 380 connection cable 400 Sealing Assembly 421 Inlet 430 module connector 440 Connecting member 461 Outlet 471 Venting Hall 472 Module Connection 473 Membrane A3 Module Extension 1100 Lower Pack Frame 1110 Internal Beam 1150 Side Pack Frame 2000 Pack Venting Unit 2100 Direction adjustment section 2200 Pack Connection 2300 Outlet

Claims

1. a first sub-module and a second sub-module, each including a battery cell assembly in which a plurality of battery cells are stacked, and a bus bar structure including a bus bar that electrically connects the battery cells and a bus bar frame that covers the battery cell assembly on at least one side; a module housing that simultaneously houses the first sub-module and the second sub-module; and a terminal assembly located in a portion of the module housing that overlaps a module extension, the first sub-module and the second sub-module facing each other at the module extension; a battery module including:

2. The battery module according to claim 1 , wherein a step is formed in a portion of the module housing where the terminal assembly is located.

3. The battery module according to claim 2 , wherein the terminal assembly is attached to the stepped portion.

4. The battery module according to claim 1 , wherein the terminal assembly includes a terminal housing and a terminal bus bar attached to the terminal housing.

5. a step portion is formed in a portion of the module housing where the terminal assembly is located; a first hole is formed in the terminal housing, a second hole is formed in the terminal bus bar, and a third hole is formed in the step portion; The battery module of claim 4 , further comprising a coupling member passing through the first hole, the second hole, and the third hole.

6. The battery module of claim 5 , wherein the connecting member is made of a conductive material, and the connecting member electrically connects the internal bus bar of the first sub-module or the internal bus bar of the second sub-module to the terminal bus bar.

7. The battery module of claim 6 , wherein the terminal bus bars include a first terminal bus bar and a second terminal bus bar, and the first terminal bus bar and the second terminal bus bar have polarities different from each other.

8. the coupling member includes a first coupling member and a second coupling member; 8. The battery module of claim 7, wherein the first connecting member electrically connects the first terminal bus bar to a first internal bus bar of the first sub-module, and the second connecting member electrically connects the second terminal bus bar to a second internal bus bar of the second sub-module.

9. The battery module according to claim 4 , wherein the terminal housing has a bent shape so as to wrap around a corner of a side surface of the module housing.

10. The battery module according to claim 1 , further comprising a sealing assembly covering each of the open ends of the module housing.

11. the sealing assembly includes a first sealing assembly covering one open end of the module housing and a second sealing assembly covering the other open end of the module housing; the first sealing assembly includes an outlet, which is a hole through which a refrigerant is discharged; The battery module of claim 10 , wherein the second sealing assembly includes an inlet that is a hole through which a coolant flows.

12. the outlet is located above a center portion based on a height of the first sealing assembly, The battery module of claim 11 , wherein the inlet is located lower than a center of the second sealing assembly based on a height of the second sealing assembly.

13. the coolant is in direct contact with the battery cell assemblies and the bus bar structure housed inside the module housing; The battery module according to claim 12 , wherein the refrigerant is insulating oil.

14. The battery module according to claim 11 , wherein a first sealing member is interposed along a periphery of the sealing assembly coupled with the open end of the module housing.

15. The battery module of claim 14 , further comprising a second sealing member interposed in a gap present in an area other than a peripheral edge of the sealing assembly.

16. The battery module of claim 15 , further comprising a third sealing member interposed between the sealing assembly and the end plate along a periphery of the end plate.

17. the sealing assembly includes a modular venting portion provided in a region of the sealing assembly; The module venting section is a venting hole extending through said sealing assembly; a module connection portion which is a hole connected to the vent hole; a fixed cover provided between the vent hole and the bus bar structure and fixed in contact with an inner surface of the sealing assembly; and The battery module according to claim 10 , further comprising a membrane provided between the vent hole and the fixed cover, the membrane being in contact with the fixed cover and fixed thereto.

18. the module connection portion protrudes from the sealing assembly in a direction away from the module housing; The battery module of claim 17 , further comprising a venting protrusion that is a region surrounding the module connection portion and protruding from the sealing assembly in a direction opposite to the module housing.

19. an end plate covering the sealing assembly provided with the module connection portion and the venting protrusion includes a venting opening; The battery module of claim 18 , wherein the venting opening is a hole penetrating the end plate, and the module connection portion and the venting protrusion are positioned while passing through the venting opening.

20. The battery module of claim 1 , wherein the module extension includes a portion where electrode leads are electrically connected to each other in the first sub-module and a portion where electrode leads are electrically connected to each other in the second sub-module.

21. A battery module including a plurality of battery modules according to claim 1; The battery pack further includes a sealing assembly that covers each of the open ends of the module housing.

22. further including an internal beam disposed between a first battery module and a second battery module adjacent to each other in a direction perpendicular to a direction in which the first sub-module and the second sub-module are arranged, 22. The battery pack of claim 21, wherein the terminal assembly is positioned to vertically overlap the internal beam.

23. The battery pack according to claim 22 , wherein the terminal assembly is disposed in an upper space of the internal beam.

24. the terminal assembly includes a first terminal assembly located on the first battery module and a second terminal assembly located on the second battery module; The battery pack according to claim 22 , further comprising a connecting member connecting the first terminal assembly and the second terminal assembly.

25. The first terminal assembly and the second terminal assembly each include a terminal housing and a terminal bus bar attached to the terminal housing; the first terminal assembly is formed with different terminal bus bars, the second terminal assembly is formed with different terminal bus bars, and the first terminal bus bars of the first terminal assembly and the second terminal bus bars of the second terminal assembly are electrically connected to each other via the connecting member; 25. The battery pack of claim 24, wherein the first terminal bus bar and the second terminal bus bar have opposite polarities.

26. The battery pack according to claim 21 , further comprising a pack venting portion connected to the battery module.

27. The pack venting section is a pack connection portion connected to the battery module; a direction adjusting portion which is a pipe connected to the pack connecting portion; and The battery pack according to claim 26, further comprising an outlet provided in a region of a side pack frame and connected to the direction adjusting portion.

28. The direction adjusting portion is located inside the side pack frame, One end of the direction adjusting portion is closed, and the other end of the direction adjusting portion is connected to the outlet, The battery pack of claim 27 , wherein the pack connection portion is a region protruding from one surface of the direction adjustment portion toward the battery module.

29. 29. The battery pack according to claim 28, wherein the pack connection portion is positioned so as to penetrate one surface of the side pack frame.

30. the pack connection portion is connected to a module connection portion of the battery module, The battery pack according to claim 28 , wherein the module connection portion is a hole communicating with the inside of the battery module.

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