Battery module and battery pack including same

Abstract

A battery module according to one embodiment of the present disclosure comprises: a battery cell stack including a first battery cell stack and a second battery cell stack in which a plurality of battery cells are stacked; a module frame accommodating the battery cell stack; and an inlet and an outlet to circulate a refrigerant inside the module frame, in which the refrigerant flows into the module frame through the inlet and is discharged through the outlet, and in which an insulating plate is disposed between the first battery cell stack and the second battery cell stack, and an opening through which the refrigerant passes is formed in the insulating plate.

Description

Technical Field

[0001] Cross - Reference to Related Applications

[0002] This application claims the priority and benefit of Korean Patent Application No. 10 - 2022 - 0135644, filed with the Korean Intellectual Property Office on October 20, 2022, and Korean Patent Application No. 10 - 2023 - 0140469, filed on October 19, 2023. The entire disclosure of the foregoing patent applications is incorporated herein by reference in its entirety.

[0003] The present disclosure relates to a battery module and a battery pack including the battery module, and more particularly, to a battery module having improved cooling efficiency and safety and a battery pack including the battery module. Background Art

[0004] With the development of technology and the increasing requirements for mobile devices, the demand for secondary batteries as an energy source has increased rapidly. Accordingly, various studies have been conducted on batteries that can meet various demands.

[0005] As an energy source for power drive devices such as electric bicycles, electric vehicles, and hybrid electric vehicles, and for mobile devices such as mobile phones, digital cameras, and laptop computers, secondary batteries have received high attention.

[0006] In recent years, with the continuous growth of the demand for large - capacity secondary battery structures (including the use of secondary batteries as an energy storage source), the demand for battery packs with a multi - module structure, which are components of battery modules formed by connecting multiple secondary batteries in series and / or in parallel, has been increasing.

[0007] On the other hand, when multiple battery cells are connected in series or in parallel to form a battery pack, generally, a battery module composed of at least one battery cell is first formed, and then a battery pack is formed by using at least one battery module and adding other components.

[0008] Since the battery cells constituting such medium - sized or large - sized battery modules are composed of secondary batteries capable of charging and discharging, such high - output large - capacity secondary batteries generate a large amount of heat during the charging and discharging process. In this case, the heat generated from multiple battery cells can accumulate in a narrow space, causing the temperature to rise faster and excessively. In other words, battery modules in which multiple battery cells are stacked and battery packs equipped with these battery modules can obtain high output, but it is not easy to remove the heat generated from the battery cells during charging and discharging. When the heat dissipation of the battery cells is not properly performed, the deterioration of the battery cells is accelerated, the lifespan is shortened, and the possibility of explosion or fire is increased.

[0009] In addition, in the case of a battery module included in a vehicle battery pack, it is often exposed to direct sunlight and may be placed under high-temperature conditions, such as in summer or in a desert area. Further, since multiple battery modules are arranged in a concentrated manner to increase the driving range of the vehicle, flames or heat generated in any one battery module can easily spread to adjacent battery modules, which may ultimately lead to the ignition or explosion of the battery pack itself.

[0010] In addition, since the battery pack is constituted by combining multiple battery modules, it is heavy and not suitable for loading multiple batteries into a mobile unit such as an automobile. Therefore, it is necessary to increase the energy density.

[0011] Figure 1 FIG. is a view showing a conventional battery pack. Figure 2 is Figure 1 exploded perspective view of the battery pack.

[0012] Referring to Figure 1 and Figure 2 , the conventional battery pack 10 includes: a lower battery pack frame 11 on which a plurality of battery modules 1 are mounted; an upper battery pack frame 12 located above the battery module 1; and an internal beam 13 that separates the positions where the battery modules 1 are mounted within the battery pack 10.

[0013] When the battery module 1 is mounted within the battery pack 10 in this manner, due to the internal beam 13 that separates between the battery modules 1, the energy density of the battery pack 10 may be reduced. Therefore, there is a problem that a large number of battery packs 10 must be provided in order to meet the efficiency required by the device or the like. Further, due to the weight of the battery pack 10, there is a limit to the number of battery packs 10 that can be provided in the device. Therefore, in order to reduce the weight of the battery pack 10 while increasing the energy density of the battery pack 10, it is necessary to mount a large number of battery modules 1 within the battery pack 10.

[0014] Figure 3 is a view showing Figure 2 a cross-sectional view of one of the battery modules included in the battery pack.

[0015] Referring to Figure 3 , the conventional battery module 1 includes: a battery cell stack 3 including battery cells 2 stacked in a predetermined direction; and a module frame 4 that houses the battery cell stack 3, wherein the battery cell stack 3 is fixedly located on a thermally conductive resin layer 5 that is located on the lower surface of the module frame 4. In this case, a radiator 6 can be provided below the bottom of the module frame 4 to cool the heat generated from the battery cell stack 3.

[0016] However, since the radiator 6 does not receive and transfer heat while being in direct contact with the battery cell stack 3, it has the disadvantage that its cooling efficiency is not very high. In particular, an air gap can be formed between the bottom of the module frame 4 and the thermally conductive resin layer 5, and the air gap is a factor that blocks heat transfer. A method for more effectively cooling the battery module 1 needs to be developed.

[0017] In summary, a more effective method for improving the cooling efficiency of the battery module is needed. Summary of the Invention

[0018] Technical Problem

[0019] An object of the present disclosure is to provide a battery module that improves cooling efficiency and enhances cooling performance, and a battery pack including the battery module.

[0020] However, the technical problems to be solved by the embodiments of the present disclosure are not limited to the above problems, and various extensions can be made within the scope of the technical concept included in the present disclosure.

[0021] Technical Solution

[0022] According to an embodiment of the present disclosure, there is provided a battery module, including: a battery cell stack including a first battery cell stack and a second battery cell stack in which a plurality of battery cells are stacked; a module frame that houses the battery cell stack; and an inlet and an outlet that circulate a refrigerant inside the module frame, wherein the refrigerant flows into the inside of the module frame through the inlet and is discharged through the outlet, and wherein an insulating plate is disposed between the first battery cell stack and the second battery cell stack, and an opening through which the refrigerant passes is formed in the insulating plate.

[0023] The opening may be formed at the center of the insulating plate.

[0024] The inlet and the outlet may be located on opposite sides with respect to the insulating plate.

[0025] The first battery cell stack may be located between the inlet and the insulating plate, and the second battery cell stack may be located between the outlet and the insulating plate.

[0026] The refrigerant flowing in through the inlet may sequentially pass through the first battery cell stack, the opening of the insulating plate, and the second battery cell stack, and be discharged through the outlet.

[0027] The inlet may be located at a position lower than the central portion with respect to the height of the battery cell stack, and the outlet may be located at a position higher than the central portion with respect to the height of the battery cell stack.

[0028] The first battery cell stack and the second battery cell stack may be arranged in a direction perpendicular to the direction in which the battery cells in the first battery cell stack or the second battery cell stack are stacked.

[0029] A first through hole and a second through hole may be formed in the insulating plate, and electrical connection between the first battery cell stack and the second battery cell stack may be made through the first through hole and the second through hole.

[0030] The battery module may further include a first sealing assembly and a second sealing assembly that respectively cover two open sides of the module frame. The inlet may be formed in the first sealing assembly, and the outlet may be formed in the second sealing assembly.

[0031] The inlet may be located at a position below the center portion based on the height of the first sealing assembly, and the outlet may be located at a position above the center portion based on the height of the second sealing assembly.

[0032] The battery cell is a pouch-type battery cell and may include electrode leads protruding in two directions. When the direction between the electrode leads is defined as the length direction, the first sealing assembly, the first battery cell stack, the insulating plate, the second battery cell stack, and the second sealing assembly may be sequentially arranged along the length direction.

[0033] The refrigerant may be insulating oil.

[0034] The refrigerant may be in direct contact with the battery cell stack accommodated in the module frame.

[0035] The insulating plate may have a configuration in which the insulating plate surrounds the outer periphery of an opening formed at the center of the insulating plate.

[0036] The opening may be formed in such a manner that it has an area of 5% or more and 60% or less with respect to the area of one surface of the insulating plate.

[0037] The length from the upper side of the insulating plate to the upper side of the opening may be 25% or more and 49% or less based on the length in the height direction of the insulating plate, and the length from the lower side of the insulating plate to the lower side of the opening may be 25% or more and 49% or less based on the length in the height direction of the insulating plate.

[0038] An inclined surface may be formed in at least a part of the region from the upper side of the insulating plate to the upper side of the opening such that the thickness of the insulating plate becomes narrower as it progresses in the direction from the upper side of the insulating plate to the upper side of the opening.

[0039] An inclined surface may be formed in at least a part of a region from the lower side of the insulating plate to the lower side of the opening, such that the thickness of the insulating plate narrows as it progresses in a direction from the lower side of the insulating plate to the lower side of the opening.

[0040] The insulating plate may include at least one rib extending along the height direction of the insulating plate.

[0041] The battery module may further include: a first bus bar frame located on one surface of the first battery cell stack; and a second bus bar frame located on one surface of the second battery cell stack. The insulating plate may be fixed to at least one of the first bus bar frame and the second bus bar frame.

[0042] According to another embodiment of the present disclosure, a battery pack including the above battery module is provided.

[0043] Advantageous Effects

[0044] According to an embodiment, the battery cells can be directly cooled with a refrigerant, thereby increasing the cooling efficiency of the battery module and the battery pack including the battery module.

[0045] In addition, a plurality of battery cell stacks can be arranged along the length direction within the battery module, thereby increasing the energy density, and an insulating plate having an opening is arranged between the plurality of battery cell stacks, thereby improving the fluidity of the refrigerant.

[0046] The effects obtained from the present disclosure are not limited to the above effects, and other effects not described herein will be clearly understood by those skilled in the art from the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a perspective view showing a conventional battery pack.

[0048] Figure 2 is Figure 1 an exploded perspective view of the battery pack.

[0049] Figure 3 is a cross-sectional view showing Figure 2 a cross-section of one battery module among the battery modules included in the battery pack.

[0050] Figure 4 is a perspective view of a battery module according to an embodiment of the present disclosure.

[0051] Figure 5 is Figure 4 an exploded perspective view of the battery module.

[0052] Figure 6 is a view showingFigure 5 Perspective view of the battery cell stack, first bus bar assembly, and second bus bar assembly included in the battery module.

[0053] Figure 7 Shows Figure 6 Plan view of one of the battery cells included in the battery cell stack.

[0054] Figure 8 Shows Figure 6 Perspective view of the first battery cell stack and the first bus bar assembly included in the battery module.

[0055] Figure 9 Is Figure 8 Exploded perspective view of the first battery cell stack and the first bus bar assembly.

[0056] Figure 10 Shows the state where side plates are further arranged on the battery cell stack, first bus bar assembly, and second bus bar assembly. Figure 6 Perspective view of the state where side plates are further arranged on the battery cell stack, first bus bar assembly, and second bus bar assembly.

[0057] Figure 11 Respectively shows Figure 10 Exploded perspective view of the first battery cell stack and the second battery cell stack included in the battery cell stack.

[0058] Figure 12 Shows Figure 10 Perspective view of the state where the battery cell stack, first bus bar assembly, second bus bar assembly, and side plates are inserted into the module frame.

[0059] Figure 13 Shows in an enlarged manner Figure 6 Partial view of A1 in

[0060] Figure 14 Shows in an enlarged manner Figure 6 Partial view of A2 in

[0061] Figure 15 Diagram showing the current movement path between the first battery cell stack and the second battery cell stack.

[0062] Figure 16 Perspective view showing the state where the first sealing assembly according to an embodiment of the present disclosure is installed on one side of the module frame.

[0063] Figure 17 Shows Figure 16 Diagram of the assembly process of the first sealing assembly.

[0064] Figure 18 Shows Figure 16Diagram of the process of installing the first sealing assembly on a surface of the module frame.

[0065] Figure 19 Is an exploded perspective view showing the state where the first end plate according to an embodiment of the present disclosure is installed on the first sealing assembly.

[0066] Figure 20 Is in Figure 19 Diagram of the configuration excluding the first end plate when viewed along the -x axis direction in the yz plane.

[0067] Figure 21 Is showing in Figure 20 Cross-sectional view of the part corresponding to A5 in the cross-section taken along the cutting line B-B' in.

[0068] Figure 22 Is a diagram showing the state where the second sealing assembly according to an embodiment of the present disclosure is installed on the other side of the module frame.

[0069] Figure 23 Is an exploded perspective view showing the state where the second end plate according to an embodiment of the present disclosure is installed on the second sealing assembly.

[0070] Figure 24 Is in Figure 23 Diagram of the configuration excluding the second end plate when viewed along the x axis direction in the yz plane.

[0071] Figure 25 Is showing in Figure 24 Cross-sectional view of the part corresponding to A6 in the cross-section taken along the cutting line C-C' in.

[0072] Figure 26 Is an exploded perspective view of the second sealing assembly according to another embodiment of the present disclosure.

[0073] Figure 27 Is a diagram when viewed along the -x axis direction in the yz plane Figure 26 When.

[0074] Figure 28 Is showing the second end plate and Figure 26 Diagram of the state where the second sealing assembly is combined.

[0075] Figure 29 Is shown in an enlarged manner Figure 11 Partial perspective view of the insulating plate located between the first battery cell stack and the second battery cell stack in.

[0076] Figure 30 Is a partial perspective view of the insulating plate included in the battery module according to another embodiment of the present disclosure.

[0077] Figure 31 Figures (a) and (b) are diagrams respectively showing a cross-section of a battery module according to a comparative example of the present disclosure and a cross-section of a battery module according to an embodiment of the present disclosure.

[0078] Figure 32 is a perspective view showing an insulating plate according to an embodiment of the present disclosure.

[0079] Figure 33 and Figure 34 are a perspective view and a front view of an insulating plate according to a modified embodiment of the present disclosure.

[0080] Figure 35 is Figure 34 a cross-sectional view taken along cutting line D-D' of

[0081] Figure 36 is a partial view showing in an enlarged manner a portion corresponding to A7 in Figure 35 Detailed Description of Embodiments

[0082] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement these embodiments. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0083] For clarity, descriptions of parts irrelevant to the description will be omitted, and throughout the description, the same reference numerals denote the same or similar elements.

[0084] In addition, in the drawings, for convenience of description, the sizes and thicknesses of the respective elements are arbitrarily shown, and the present disclosure is not necessarily limited to the sizes and thicknesses shown in the drawings. In the drawings, for clarity, the thicknesses of layers, regions, etc. are enlarged. In the drawings, for convenience of description, the thicknesses of parts and regions are enlarged.

[0085] In addition, it will be understood that when an element such as a layer, film, region, or plate is referred to as being "on" or "above" another element, it can be directly on the other element or there can also be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, this means that there are no other intermediate elements. In addition, a particular part being "above" or "on" a reference part means that the particular part is above or below the reference part, and does not particularly mean that the particular part is "above" or "on" in the opposite direction to gravity.

[0086] In addition, throughout the description, when a part is referred to as "including" or "containing" a specific component, it means that the part may also include other components, and other components are not excluded unless otherwise stated.

[0087] In addition, throughout the description, when referred to as "plane", it means observing the target part from the upper side at this time, and when referred to as "cross-section", it means observing the target part from the side of the cross-section cut vertically at this time.

[0088] Figure 4 is a perspective view of a battery module according to an embodiment of the present disclosure. Figure 5 is Figure 4 exploded perspective view of the battery module of. Figure 6 is shown Figure 5 perspective view of the battery cell stack and the first bus bar assembly and the second bus bar assembly included in the battery module of. Figure 7 is shown Figure 6 plan view of one battery cell included in the battery cell stack of.

[0089] Referring to Figures 4 to 7 , the battery module 100 according to an embodiment of the present disclosure includes: a battery cell stack 120 including a first battery cell stack 120a and a second battery cell stack 120b; a module frame 200 that houses the battery cell stack 120; and an inlet and an outlet through which a refrigerant circulates inside the module frame 200. The first battery cell stack 120a and the second battery cell stack 120b are formed by stacking a plurality of battery cells 110. The refrigerant, the inlet, and the outlet will be described later.

[0090] First, the battery cell 110 can be a pouch-type battery cell and can include electrode leads 130 that protrude in two directions. Such a pouch-type battery cell can be formed by accommodating an electrode assembly in a pouch case made of a laminate sheet including a resin layer and a metal layer, and then bonding the outer peripheral portion of the pouch case. Such a battery cell 110 can have a rectangular sheet structure. Specifically, the battery cell 110 according to the present embodiment has a structure in which two electrode leads 130 protrude from one end 114a and the other end 114b of the battery body 113, respectively. More specifically, the electrode leads 130 protrude in opposite directions, and one of such electrode leads 130 can be a cathode lead and the other can be an anode lead. In the present embodiment, the direction between the electrode leads 130 that protrude in two directions of the battery cell 110 is referred to as the length direction of the battery cell 110. In one example, referring to Figure 6 and Figure 7 , the direction parallel to the x-axis can correspond to the length direction of the battery cell 110.

[0091] The battery cell 110 can be manufactured by bonding two end portions 114a and 114b of the battery case 114 to a side portion 114c connecting them in a state where an electrode assembly (not shown) is accommodated in the battery case 114. In other words, the battery cell 110 according to an embodiment of the present disclosure has a total of three sealing portions, and the sealing portions have a structure sealed by a method such as welding, and the remaining other side portion can be composed of a folding portion 115.

[0092] A plurality of such battery cells 110 can be configured, and the plurality of battery cells 110 can be stacked to be electrically connected to each other, thereby forming a battery cell stack 120. The battery cell stack 120 includes a first battery cell stack 120a and a second battery cell stack 120b. In particular, when the battery cell 110 is upright, the battery cells 110 can be stacked in one direction in a state where one surface of the battery main body 113 faces each other. More specifically, as Figures 4 to 7 shown, the battery cells 110 can be stacked from one side surface portion of the module frame 200 to the other side surface portion in an upright state, such that one surface of the battery main body 113 of the battery cell 110 is parallel to the side surface portion of the module frame 200. As an example, a state where a plurality of battery cells 110 are stacked in a direction parallel to the y-axis is shown. When the plurality of battery cells 110 are stacked in this way in a direction parallel to the y-axis, the electrode leads 130 in one battery cell 110 protrude in the x-axis direction and the -x-axis direction, respectively.

[0093] In one region, a plurality of battery cells 110 are stacked in a direction parallel to the y-axis to form a first battery cell stack 120a, and in another region, a plurality of battery cells 110 can be stacked in a direction parallel to the y-axis to form a second battery cell stack 120b.

[0094] The battery case 114 is generally formed in a laminated structure of a resin layer / a metal thin film layer / a resin layer. For example, when the surface of the battery cell case is formed of an O (oriented)-nylon layer, when a plurality of battery cells are stacked to form a medium-sized battery module and a large-sized battery module, there is a tendency to easily slide due to an external impact. Therefore, in order to prevent this problem and maintain a stable stacked structure of the battery cells, a viscous adhesive such as a double-sided tape or a chemical adhesive that is joined by a chemical reaction during bonding can be attached to the surface of the battery case to form the first battery cell stack 120a and the second battery cell stack 120b.

[0095] On the other hand, the first battery cell stack 120a and the second battery cell stack 120b are arranged along a direction perpendicular to the stacking direction of the battery cells 110 in the first battery cell stack 120a or the second battery cell stack 120b. In other words, the first battery cell stack 120a and the second battery cell stack 120b can be arranged along the direction in which the electrode leads 130 protrude with respect to the battery cells 110. That is to say, the first battery cell stack 120a and the second battery cell stack 120b are arranged along the longitudinal direction of the battery cells 110. For example, as Figure 6 shown, when a plurality of battery cells 110 are stacked along a direction parallel to the y-axis to form the first battery cell stack 120a and the second battery cell stack 120b, the first battery cell stack 120a and the second battery cell stack 120b can be arranged along a direction parallel to the x-axis.

[0096] The module frame 200 can be used to protect the battery cell stack 120 and the electrical devices connected thereto from the influence of external physical impacts. The battery cell stack 120 and the electrical devices connected thereto can be accommodated in the internal space of the module frame 200.

[0097] The structure of the module frame 200 can be changed. According to an embodiment of the present disclosure, the structure of the module frame 200 can be a single-frame structure. Herein, the single frame can be in the form of a metal plate integrated with an upper surface, a lower surface, and two side surfaces. The single frame can be manufactured by extrusion molding.

[0098] However, the structure of the module frame 200 is not limited thereto. In another example, the module frame 200 can have a structure in which a U-shaped frame is combined with an upper plate. In this case, the U-shaped frame can have a lower surface and two side surfaces extending upward from two edges of the lower surface, and the upper plate can have a plate shape. At this time, each frame or plate constituting the U-shaped frame can be manufactured by pressing molding. In addition, the structure of the module frame 200 can be set to a single-frame or L-shaped frame structure in addition to the U-shaped frame, and can be set to various structures not described in the above examples.

[0099] The module frame 200 can have a configuration with openings on both sides. More specifically, the module frame 200 can be set to a configuration that is open along the length direction of the battery cells 110. In this case, the front surface and the rear surface of the battery cell stack 120 can be not covered by the module frame 200. The front surface and the rear surface of the battery cell stack 120 can be covered by the first bus bar assembly 300a and the second bus bar assembly 300b, the sealing assembly 400, or the end plate 500, which will be described later, so as to protect the front surface and the rear surface of the battery cell stack 120 from the influence of external physical impacts and the like.

[0100] The battery module 100 may include a first bus bar assembly 300a located on one side and the other side of the first battery cell stack 120a, and a second bus bar assembly 300b located on one side and the other side of the second battery cell stack 120b. Specifically, the first bus bar assembly 300a may be located in the direction in which the electrode leads 130 of the battery cells 110 included in the first battery cell stack 120a protrude. In addition, the second bus bar assembly 300b may be located in the direction in which the electrode leads 130 of the battery cells 110 included in the second battery cell stack 120b protrude. The first bus bar assembly 300a and the second bus bar assembly 300b may each include a bus bar frame, a bus bar, and a terminal bus bar, which will be described later.

[0101] The battery module 100 may include a sealing assembly 400. The sealing assembly 400 may be located on the open two sides of the module frame 200, and may be formed to cover the battery cell stack 120. The sealing assembly 400 located on one open side of the module frame 200 is the first sealing assembly 410, and the sealing assembly 400 located on the other open side of the module frame 200 may be the second sealing assembly 450. That is, the battery module 100 according to the present embodiment may further include the first sealing assembly 410 and the second sealing assembly 450 that respectively cover the open two sides of the module frame 200.

[0102] The sealing assembly 400 may separate the open two sides of the module frame 200 from the external environment. Specifically, when refrigerant is injected into the interior of the module frame 200, which will be described later, the sealing assembly 400 may be used to seal the refrigerant to prevent it from leaking to the outside.

[0103] End plates 500 may be located on the open two sides of the module frame 200 to cover the sealing assembly 400. The end plate 500 located on one open side of the module frame 200 is the first end plate 510, and the end plate 500 located on the other open side of the module frame 200 is the second end plate 550.

[0104] Such end plates 500 can physically protect the battery cell stack 120 and other electronic components from external impacts.

[0105] Next, the components included in the battery module 100 of the present embodiment will be described in detail.

[0106] Figure 8 Is a perspective view showing Figure 6 the first battery cell stack and the first bus bar assembly included in the battery module. Figure 9 Is Figure 8 an exploded perspective view of the first battery cell stack and the first bus bar assembly. Figure 10 Is a view showing in Figure 6Perspective view of the state in which side plates are further arranged on the battery cell stack, the first bus bar assembly, and the second bus bar assembly. Figure 11 are respectively shown Figure 10 exploded perspective views of the first battery cell stack and the second battery cell stack included in the battery cell stack. Figure 12 is a view showing Figure 10 perspective view of the state in which the battery cell stack, the first bus bar assembly, the second bus bar assembly, and the side plates are inserted into the module frame.

[0107] Referring together to Figure 6 and Figures 8 to 12 , as described above, the battery cell stack 120 includes a first battery cell stack 120a and a second battery cell stack 120b arranged along the length direction of the battery cells 110. In addition, the first bus bar assembly 300a can be located on each of one side and the other side of the first battery cell stack 120a, and the second bus bar assembly 300b can be located on each of one side and the other side of the second battery cell stack 120b.

[0108] At this time, the first battery cell stack 120a and the first bus bar assembly 300a can be collectively referred to as the first sub-module 100a, and the second battery cell stack 120b and the second bus bar assembly 300b can be collectively referred to as the second sub-module 100b. Specifically, the battery module 100 according to the present embodiment can be a battery module in which the first sub-module 100a and the second sub-module 100b arranged in the module frame 200 are electrically coupled to each other.

[0109] First, the first sub-module 100a can include the first battery cell stack 120a and the first bus bar assembly 300a. The first bus bar assembly 300a can be located on each of one side and the other side of the first battery cell stack 120a. The first bus bar assembly 300a can be located in the direction in which the electrode leads 130 of the battery cells 110 included in the first battery cell stack 120a protrude. In addition, a first flexible printed circuit board (FPCB) 350a electrically connected to the first bus bar assembly 300a can be provided.

[0110] The first battery cell stack 120a can include: a plurality of battery cells 110; at least one first cooling fin 210a located between the plurality of battery cells 110; and a first compression pad 250a provided on one surface of the battery cell 110 located on the outermost side of the battery cells 110.

[0111] The first cooling fin 210a can be located between the plurality of battery cells 110. For example, the first cooling fin 210a can be located between two battery cells 110. Specifically, one first cooling fin 210a and another adjacent first cooling fin 210a can be arranged such that two battery cells 110 are inserted therebetween.

[0112] The first cooling fin 210a may include a first plate 211a that contacts one side surface of the battery cell 110. Here, one side surface of the battery cell 110 is a surface of the battery body 113 of the battery cell 110 (see Figure 7 ), and may be a surface of the battery cell 110 that extends along the length direction (x-axis direction).

[0113] One surface of the first plate 211a may contact one side surface of the battery cell 110 that faces one surface of the first plate 211a. The other surface of the first plate 211a may contact one surface of another battery cell 110 that faces the other surface of the first plate 211a and is adjacent to it at the same time. In this case, although not shown in the figure, an adhesive member is interposed between the side surface of the battery cell 110 and the first plate 211a so that the battery cell 110 and the first plate 211a can be adhesively fixed. For example, the adhesive member may be an insulating tape.

[0114] The upper surface (z-axis direction) of the first plate 211a may contact the upper surface of the module frame 200, and the lower surface of the first plate 211a may contact the lower surface of the module frame 200. Accordingly, the first cooling fin 210a can be fixed and located within the module frame 200, and thus the battery cell 110 attached to the first cooling fin 210a can also be fixed and located within the module frame 200.

[0115] When the size of the first plate 211a is larger than the size of the battery cell 110, the upper and lower portions of the battery cell 110 may be spaced apart from the upper and lower portions of the module frame 200 by a predetermined distance. Specifically, when the height of the first plate 211a is longer than the height of the battery cell 110, the battery cell 110 may be adhesively fixed while being located at the center portion of the first plate 211a. In this case, the upper and lower portions of the battery cell 110 may be spaced apart from the upper surface and the lower surface of the module frame 200 by a predetermined distance. Here, the heights of the battery cell 110 and the first plate 211a are referred to as the lengths in the z-axis direction.

[0116] The first cooling fin 210a may further include the first plate 211a and a first protrusion 213a protruding from one end of the first plate 211a. As an example, the first cooling fin 210a may have an L shape. Specifically, referring to Figure 9 , the first cooling fin 210a may include: a first plate 211a having a surface corresponding to or larger than one side surface of the battery cell 110; and a first protrusion 213a protruding from one end of the first plate 211a and parallel to the stacking direction (y-axis direction) of the first battery cell stack 120a.

[0117] The first protrusion 213a may be a region protruding in a direction perpendicular to the first plate 211a, and may be in contact with at least one of the upper surface or the lower surface of the module frame 200. Specifically, one surface of the first protrusion 213a may be disposed to face the upper surface or the lower surface of the battery cell 110, and the other surface of the first protrusion 213a may be in contact with the lower surface or the upper surface of the module frame 200.

[0118] For example, one surface of the first protrusion 213a may be disposed to face the lower surface of the battery cell 110, and the upper surface and the lower surface of the battery cell 110 may be adhesively fixed to the first plate 211a while having a predetermined height from the upper surface and the lower surface of the module frame 200. In other words, a predetermined space may be provided between one surface of the first protrusion 213a and the lower surface of the battery cell 110 and between the upper surface of the module frame 200 and the upper surface of the battery cell 110 so that the refrigerant described later can move therebetween. In this case, the distance between one surface of the first protrusion 213a and the lower surface of the battery cell 110 may correspond to the distance between the upper surface of the module frame 200 and the upper surface of the battery cell 110.

[0119] The other surface of the first protrusion 213a may be in contact with the bottom of the module frame 200. Specifically, the other surface of the first protrusion 213a may be adhesively fixed while being in contact with the bottom of the module frame 200, whereby the first cooling fin 210a may be fixedly located within the module frame 200.

[0120] However, the shape of the first cooling fin 210a is not limited to the shape shown in the figure, and may have a flat plate shape, and any shape may be used without limitation as long as the first cooling fin 210a can fix the battery cell 110 while being in contact with the battery cell 110.

[0121] The first cooling fin 210a may be made of metal. Specifically, the first cooling fin 210a may be made of a metal having high thermal conductivity. Therefore, the first cooling fin 210a can directly receive and transfer the heat generated in the battery cell 110 during charging and discharging of the battery. When heat is generated, the heat is transferred to the first cooling fin 210a in contact with the side surface of the battery cell 110 for primary cooling, and the refrigerant described below can be in direct contact with the upper and lower portions of the battery cell 110 for secondary cooling. Accordingly, direct cooling can be performed even in regions of the upper and lower portions of the battery cell where it has been relatively difficult to cool in the past, thereby improving the cooling efficiency.

[0122] The first compression pad 250a may be located on the outermost side of the first battery cell stack 120a. When the battery cell 110 expands due to charge and discharge, the first compression pad 250a can perform the function of absorbing the expansion. Specifically, while the battery cell 110 expands, the first compression pad 250a pushes the side surface of the module frame 200, thereby preventing the battery cell housing 114 (see Figure 7 ) of the battery cell 110 from cracking, thus improving the safety of the battery module 100.

[0123] However, the first compression pad 250a is not limited to being only located on the outermost side of the first battery cell stack 120a, and it may also be located between the battery cells 110 that make up the first battery cell stack 120a.

[0124] The first bus bar assembly 300a may include a first bus bar frame 310a and a first bus bar 330a mounted on the first bus bar frame 310a.

[0125] The first bus bar frame 310a is located on one surface of the first battery cell stack 120a and may cover one surface of the first battery cell stack 120a. At the same time, it guides the connection between the first battery cell stack 120a and an external device. The first bus bar frame 310a may be located on one surface and the other surface of the first battery cell stack 120a.

[0126] The first bus bar 330a may be mounted on the first bus bar frame 310a. In a specific example, the inner surface of the first bus bar frame 310a may face the first battery cell stack 120a, and the first bus bar 330a may be mounted to the outer surface of the first bus bar frame 310a.

[0127] The first bus bar frame 310a may include an electrically insulating material. The first bus bar frame 310a can limit contact with other parts of the battery cell 110 except for the part where the first bus bar 330a is joined to the electrode lead (not shown), and can prevent electrical short - circuit from occurring.

[0128] The first bus bar 330a is mounted on the outer surface of the first bus bar frame 310a and can be used for electrically connecting to the battery cells 110 included in the first battery cell stack 120a and for electrically connecting the first battery cell stack 120a to an external device circuit. The first bus bar 330a is located on the first bus bar frame 310a, and the first bus bar assembly 300a is covered by a sealing assembly 400 and an end plate 500 to be described later, so that the first bus bar assembly 300a can be protected from external impacts, etc., and the durability reduction caused by external moisture can be minimized.

[0129] The first bus bar 330a can be electrically connected to the first battery cell stack 120a through the electrode lead 130 of the battery cell 110. Specifically, the electrode lead 130 of the battery cell 110 passes through the slit formed in the first bus bar frame 310a, and then can be bent and connected to the first bus bar 330a. The battery cells 110a included in the first battery cell stack 120a can be connected in series or in parallel through the first bus bar 330a. There is no particular limitation on the connection method between the electrode lead 130 and the first bus bar 330a, and welding joint can be applied as an example.

[0130] The first flexible printed circuit board 350a is configured to extend and be installed in the length direction of the battery cell 110 to sense the battery cell 110. That is, as Figure 8 and Figure 9 shown, the first flexible printed circuit board 350a can sense the voltage data and thermal data of the battery cell 110 while being placed on the upper part of the first battery cell stack 120a. In particular, the first flexible printed circuit board 350a can be electrically connected to the first bus bar 330a while bending toward the first bus bar frame 310a at the end of the first flexible printed circuit board 350a. Thus, the voltage data of each battery cell 110 can be sensed and transmitted to the outside.

[0131] The second sub-module 100b may include a second battery cell stack 120b and a second bus bar assembly 300b, and the second bus bar assembly 300b may include a second bus bar frame 310b and a second bus bar 330b. In addition, a second flexible printed circuit board 350b may be provided to be connected to the second bus bar assembly 300b.

[0132] The second bus bar frame 310b is located on one surface of the second battery cell stack 120b such that the second bus bar frame 310b can cover one surface of the second battery cell stack 120b while guiding the connection between the second battery cell stack 120b and an external device. The second bus bar frame 310b may be located on the front surface or another surface of the second battery cell stack 120b.

[0133] For the components included in the second sub-module 100b, the same or similar structure as that of the components included in the first sub-module 100a described above can be applied. Therefore, in order to avoid repeated description, the detailed description of the components included in the second sub-module 100b will be omitted.

[0134] As described above, within the battery module 100, the first sub-module 100a and the second sub-module 100b can be electrically connected to each other. That is, the battery module 100 according to this embodiment corresponds to a dual-model battery module having the first sub-module 100a and the second sub-module 100b.

[0135] Reference Figure 6 and Figures 10 to 12 In this embodiment, the first bus bar assembly 300a located on the other side of the first battery cell stack 120a and the second bus bar assembly 300b located on one side of the second battery cell stack 120b can be electrically connected to each other. In this case, with reference to Figure 11 , the first bus bar assembly 300a and the second bus bar assembly 300b can be electrically connected by a connection cable 380. The connection cable 380 will be described in more detail later in Figure 13 .

[0136] Reference Figure 10 and Figure 11 , side plates 210 can be provided on both sides of the first sub-module 100a and the second sub-module 100b.

[0137] The side plates 210 can be plates extending along the length direction of the battery cells 110. Specifically, the length of the side plates 210 can correspond to the sum of the lengths of the first sub-module 100a and the second sub-module 100b.

[0138] The side plates 210 can be arranged facing the outermost battery cells 110 among the battery cells 110 included in the first sub-module 100a and the outermost battery cells 110 among the battery cells 110 included in the second sub-module 100b. Alternatively, the side plates 210 can be arranged facing the first compression pads 250a included in the first sub-module 100a and the second compression pads 250b included in the second sub-module 100b.

[0139] The side plates 210 can be made of a rigid metal. When the first sub-module 100a and the second sub-module 100b are inserted and installed into the module frame 200, the side plates 210 can perform the function of protecting the outermost battery cells 110 or the compression pads 250a and 250b of the first sub-module 100a and the second sub-module 100b. In addition, since the battery module 100 of this embodiment is a dual model having the first battery cell stack 120a and the second battery cell stack 120b and is longer than the length of a general battery cell stack, it may not be easy to insert and assemble the battery module 100 into the module frame 200. In this case, as shown in Figures 10 to 12 , the side plates 210 guide the battery cell assembly 120 to be inserted into the module frame 200, which enables the battery module to be easily assembled without damaging the battery cells 110 and the compression pads 250a and 250b.

[0140] Figure 13 is a partial view showing A1 in Figure 6 in an enlarged manner. Figure 14 is a partial view showing Figure 6Partial view of A2 in

[0141] Referring to Figure 6 、 Figure 11 and Figure 13 , a connection cable 380 is provided between the first sub-module 100a and the second sub-module 100b so that the first sub-module 100a and the second sub-module 100b can be electrically connected. The connection cable 380 can be a flexible flat cable (FFC: flexible flat cable).

[0142] The connection cable 380 can connect the first flexible printed circuit board 350a in the first sub-module 100a and the second flexible printed circuit board 350b in the second sub-module 100b. Voltage data or thermal data for the first battery cell stack 120a and voltage data or thermal data for the second battery cell stack 120b can both be transmitted to the BMS (battery cell management system) outside the battery module 100. That is, the LV (low voltage) connection between the first sub-module 100a and the second sub-module 100b can be achieved through the connection cable 380. Here, the LV connection can refer to a sensing connection for detecting and controlling the voltage of the battery cell.

[0143] In addition, as described above, the first flexible printed circuit board 350a and the second flexible printed circuit board 350b are connected by the connection cable 380, thereby reducing the total height of the battery module 100 and increasing the energy density of the battery itself. In addition, the installation space of the battery module 100 can be ensured, and when the battery module 100 is installed in a device such as an automobile, the driving performance and fuel efficiency can be improved.

[0144] Referring to Figure 14 , the first sub-module 100a and the second sub-module 100b can be electrically connected by connecting the electrode leads 130 to each other. Specifically, at least one electrode lead 130a of the battery cells 110 included in the first battery cell stack 120a and at least one electrode lead 130b of the battery cells 110 included in the second battery cell stack 120b can be electrically connected by overlapping each other. In this case, the two electrode leads 130a and 130b can be electrically connected while contacting the connection bus bar 330. The two electrode leads 130a and 130b and the connection bus bar 330 can be welded and joined to each other to make them electrically connected.

[0145] The two electrode leads 130a and 130b connected to the connection bus bar 330 can be electrode leads protruding from the outermost battery cells 110 in the first battery cell stack 120a and the outermost battery cells 110 in the second battery cell stack 120b respectively. Referring to Figure 6 and Figure 14, the connection forms of the two electrode leads 130a and 130b with the connection bus bar 330 are shown as being formed only in one area, but the same connection form can be provided in the relative area with respect to the stacking direction of the battery cell 110. The electrical connection relationship and the current movement path between the first battery cell stack 120a and the second battery cell stack 120b will be described in more detail below.

[0146] Figure 15 It is a diagram showing the current movement path between the first battery cell stack and the second battery cell stack.

[0147] Refer to Figure 15 , in the electrically connected first sub-module 100a and second sub-module 100b, the end in the x-axis direction can be defined as one end, the end in the -x axis direction can be defined as the other end, and the area where the first sub-module 100a and the second sub-module 100b are electrically connected can be defined as the connection area A3. Below, the connection structure of the electrode leads and the flow of current at one end, the other end, and the connection area A3 will be described in detail. In particular, for the convenience of explanation, the electrode leads included in the first sub-module 100a are referred to as the first electrode leads, and the electrode leads included in the second sub-module 100b are referred to as the second electrode leads.

[0148] The outermost first electrode lead 130a1 at one end of the first sub-module 100a and the adjacent first electrode lead 130a6 are electrically connected to the outside, so that current can be supplied to the first sub-module 100a and the second sub-module 100b. In this case, current is supplied to the first sub-module 100a from the outside, but since the first electrode lead 130a and the second electrode lead 130b are electrically connected in the connection area A3, current can also flow through the second sub-module 100b.

[0149] In the connection area A3, the outermost first electrode lead 130a of the first battery cell stack 120a of the first sub-module 100a and the outermost second electrode lead 130b of the second battery cell stack 120b of the second sub-module 100b can be electrically connected to each other. Specifically, the outermost first electrode leads 130a2 and 130a3 at the other end of the first sub-module 100a can be electrically connected to the outermost second electrode leads 130b1 and 130b5 at one end of the second sub-module 100b.

[0150] In this case, electrode leads other than the outermost first electrode leads 130a2 and 130a3 and the outermost second electrode leads 130b1 and 130b5 can be electrically connected to adjacent electrode leads respectively. More specifically, at the other end of the first sub-module 100a, the first electrode leads other than the outermost first electrode leads 130a2 and 130a3 can be electrically connected while being paired with adjacent first electrode leads. Similarly, even at one end of the second sub-module 100b, the second electrode leads other than the outermost second electrode leads 130b1 and 130b5 can be paired with and electrically connected to adjacent second electrode leads.

[0151] At one end of the first sub-module 100a other than the connection area A3, the first outermost electrode lead 130a1 electrically connected to an external power source and the remaining first electrode leads other than the adjacent first electrode lead 130a6 can be electrically connected to each other. In one example, adjacent first electrode leads can be paired and electrically connected.

[0152] At the other end of the second sub-module 100b other than the connection area A3, adjacent second electrode leads can be electrically connected to each other. In one example, adjacent second electrode leads can be paired and electrically connected. Herein, the second outermost electrode leads 130b2 and 130b4 of the second sub-module 100b can also be electrically connected to each other while being paired with adjacent second electrode leads.

[0153] When the electrical connections of the electrode leads 130a and 130b are formed as described above, current can flow along such electrical connections of the electrode leads 130a and 130b.

[0154] That is, the arrows in this figure indicate the flow of current. However, the flow of current is not limited to that shown in this figure, and any flowing current is possible as long as those skilled in the art can change the electrical connections of the electrode leads to easily change the flow of current.

[0155] In this embodiment, the first battery cell stack 120a and the second battery cell stack 120b arranged along the length direction in a battery module 100 are arranged to form a dual-model battery module 100. Compared with two single-model battery modules each containing one battery cell stack, the dual-model battery module of this embodiment can significantly reduce the space required in the length direction. That is, the battery module 100 according to this embodiment has the advantages of being able to reduce the number of parts and improving the energy density or space utilization rate as the required space decreases.

[0156] Next, the structure for circulating refrigerant inside the battery module according to this embodiment will be described in detail.

[0157] Refer again to Figure 4 , Figure 5 and Figure 11 , the battery module 100 according to the present embodiment includes an inlet 421 and an outlet 461 for circulating a refrigerant inside the module frame 200. The refrigerant flows into the inside of the module frame 200 through the inlet 421 and then is discharged to the outside of the battery module 100 through the outlet 461.

[0158] The refrigerant can be in direct contact with the battery cell stack 120, the first bus bar assembly 300a and the second bus bar assembly 300b, and other electronic components accommodated inside the module frame 200, and receive and transfer the heat generated from them.

[0159] The refrigerant can be a fluid. However, since the refrigerant is in direct contact with the battery cell stack 120, the first bus bar assembly 300a and the second bus bar assembly 300b, and other electronic components inside the battery module 100, the refrigerant needs to be electrically insulated. Therefore, the refrigerant can be a material with insulating properties. As an example, the refrigerant can be insulating oil.

[0160] That is to say, in the case of the present embodiment, the refrigerant is in direct contact with the battery cell stack 120, the first bus bar assembly 300a and the second bus bar assembly 300b, and other electronic components that generate heat inside the battery module 100, and can directly cool them while receiving and transferring heat. Therefore, compared with the case of indirectly cooling the battery module 1 (refer to Figure 3 ) using a radiator 6 or the like in the conventional battery module 1, the battery module 100 according to the present embodiment can improve the cooling efficiency through direct cooling, thereby extending the life of the battery.

[0161] At this time, in the present embodiment, an insulating plate 700 is arranged between the first battery cell stack 120a and the second battery cell stack 120b, and an opening 700H for the refrigerant to pass through is formed in the insulating plate 700. As an example, the opening 700H can be formed in the center of the insulating plate 700, and the opening 700H can be opened as a rectangle with the upper and lower sides longer than the two sides. That is to say, the opening 700H can be opened to extend longer along the stacking direction of the battery cells 110.

[0162] The insulating plate 700 can include a material with electrical insulating properties. As an example, the insulating plate 700 can be an injection molded product.

[0163] More specifically, the inlet 421 and the outlet 461 can be located on opposite sides with respect to the insulating plate 700. The first battery cell stack 120a can be located between the inlet 421 and the insulating plate 700, and the second battery cell stack 120b can be located between the outlet 461 and the insulating plate 700.

[0164] The refrigerant flowing in through the inlet 421 sequentially passes through the first battery cell stack 120a, the opening 700H of the insulating plate 700, and the second battery cell stack 120b, and can be discharged through the outlet 461.

[0165] Since both the first battery cell stack 120a and the second battery cell stack 120b are included within a module frame 200, there is a risk of short - circuit due to contact between the first battery cell stack 120a and the second battery cell stack 120b or contact between the first bus bar assembly 300a on the other side of the first battery cell stack 120a and the second bus bar assembly 300b on one side of the second battery cell stack 120b.

[0166] In addition, as described above, the battery module 100 according to the present embodiment includes the first battery cell stack 120a and the second battery cell stack 120b and has an arrangement extending along the length direction. When the refrigerant circulates within the module frame 200, there may be a section where the flow of the refrigerant stagnates between the first battery cell stack 120a and the second battery cell stack 120b.

[0167] Therefore, in the present embodiment, an insulating plate 700 having electrical insulation properties is disposed between the first battery cell stack 120a and the second battery cell stack 120b. By using the insulating plate 700, an attempt is made to ensure the electrical insulation properties and the creepage distance between the first battery cell stack 120a and the second battery cell stack 120b or between the first bus bar assembly 300a and the second bus bar assembly 300b.

[0168] In addition, the insulating plate 700 is designed such that an opening 700H for the refrigerant to pass through is formed in the center of the insulating plate 700, thereby attempting to prevent the stagnation of the refrigerant flow in the space between the first battery cell stack 120a and the second battery cell stack 120b. In other words, an attempt is made to ensure the flow of the refrigerant and improve the cooling performance.

[0169] On the other hand, with reference to Figures 13 to 15 , the form of electrical connection between the first battery cell stack 120a and the second battery cell stack 120b has been described. For example, the electrical connection between the outermost first electrode leads 130a2 and 130a3 and the outermost second electrode leads 130b1 and 130b5 in the connection region A3 and the LV connection using the connection cable 380. With reference to Figure 11 and Figures 13 to 15 , such an electrical connection between the first battery cell stack 120a and the second battery cell stack 120b can be achieved through the first through - hole 700H1 and the second through - hole 700H2 formed in the insulating plate 700.

[0170] Specifically, the outermost first electrode lead 130a2 in the first battery cell stack 120a and the outermost second electrode lead 130b1 in the second battery cell stack 120b can pass through one of the first through-holes 700H1 formed in the insulating plate 700 and be connected to each other. Next, the outermost first electrode lead 130a3 in the first battery cell stack 120a and the outermost second electrode lead 130b5 in the second battery cell stack 120b can pass through the other of the first through-holes 700H1 formed in the insulating plate 700 and be connected to each other. The first through-hole 700H1 is preferably opened only to a size that allows the outermost first electrode leads 130a2, 130a3 and the outermost second electrode leads 130b1, 130b5 to pass through.

[0171] The connection cable 380 connecting the first flexible printed circuit board 350a in the first sub-module 100a and the second flexible printed circuit board 350b in the second sub-module 100b can pass through the second through-hole 700H2 formed in the insulating plate 700. The second through-hole 700H2 is preferably opened only to a size that allows the connection cable 380 to barely pass through.

[0172] On the other hand, the opening 700H according to the present embodiment can be formed in such a manner that it has an area of 5% or more and 60% or less with respect to the area of one surface of the insulating plate 700. Here, the area of one surface of the insulating plate 700 can be the area including the opening areas of the first through-hole 700H1 and the second through-hole 700H2. That is, if it is assumed that the first through-hole 700H1 and the second through-hole 700H2 are closed, the area of one surface of the insulating plate 700 can be used as the reference for the above ratio.

[0173] If the area of the opening 700H is less than 5% of the area of one surface of the insulating plate 700, the area through which the refrigerant passes is too narrow, which will hinder the flow of the refrigerant. In addition, if the area of the opening 700H exceeds 60% of the area of one surface of the insulating plate 700, the area of the opening 700H is too large. Therefore, the stagnation of the refrigerant flow cannot be solved in the space between the first battery cell stack 120a and the second battery cell stack 120b, and there is a risk of short circuit occurring between the first sub-module 100a and the second sub-module 100b.

[0174] Next, the specific positions where the inlet 421 and the outlet 461 according to the present embodiment are formed will be described in detail.

[0175] Figure 16 is a perspective view showing a state in which a first sealing assembly according to an embodiment of the present disclosure is mounted on one side of a module frame.

[0176] Refer to Figures 4 to 7 andFigure 16 As described above, the battery module 100 may include a first sealing assembly 410 and a second sealing assembly 450 that respectively cover the open two sides of the module frame 200. An inlet 421 may be formed in the first sealing assembly 410, and an outlet 461 may be formed in the second sealing assembly 450.

[0177] As described above, the battery cell 110 according to the present embodiment is a pouch-type battery cell and may include electrode leads 130 protruding in two directions. The direction between the electrode leads 130 protruding in two directions may be referred to as the length direction of the battery cell 110. The direction parallel to the x-axis may correspond to the length direction of the battery cell 110. The first sealing assembly 410, the first battery cell stack 120a, the insulating plate 700, the second battery cell stack 120b, and the second sealing assembly 450 may be sequentially positioned along this length direction. That is, the refrigerant flowing in through the inlet 421 formed in the first sealing assembly 410 may sequentially pass through the first battery cell stack 120a, the opening 700H of the insulating plate 700, and the second battery cell stack 120b, and be discharged through the outlet 461 formed in the second sealing assembly 450.

[0178] In the battery module 100 according to the present embodiment, the first bus bar assembly 300a electrically connected to the battery cell stack may be located on one open surface of the module frame 200, and the first sealing assembly 410 may be installed while covering the first bus bar assembly 300a. More specifically, the first sealing assembly 410 may cover the first bus bar assembly 300a located on one side of the first battery cell stack 120a.

[0179] The first sealing assembly 410 may include: a first sealing cover 420, which is a plate covering one open surface of the module frame 200; an inlet 421, which is a hole formed in the first sealing cover 420; and a module connector 430, which is installed in a region of the first sealing cover 420.

[0180] The first sealing cover 420 is a plate covering one open surface of the module frame 200 and may have a size corresponding to the size of one open surface of the module frame 200. That is, the first sealing cover 420 may be installed on the module frame 200 while covering one open surface of the module frame 200. In one example, the first sealing cover 420 may be assembled with the module frame 200.

[0181] The inlet 421 may be a hole formed in a region of the first sealing cover 420. The inlet 421 may be a hole protruding from the outer surface (x-axis direction) of the first sealing cover 420. That is, the inlet 421 may be a hole protruding in a direction opposite to the direction in which the module frame 200 is located. The protruding inlet 421 may pass through the inlet opening 540 formed in the first end plate 510.

[0182] The inlet 421 may be located at a position below the center portion based on the height of the battery stack 120. The inlet 421 may be located near the lower end portion of the first sealing assembly 410. Specifically, the inlet 421 may be located below the center portion based on the height of the first sealing assembly 410. Here, the height of the battery stack 120 or the first sealing assembly 410 refers to the length in the z-axis direction in the figure.

[0183] The module connector 430 can detect, for example, overvoltage, overcurrent, and overheating phenomena of the battery cells and control these phenomena. The module connector 430 is used for LV (low voltage) connection, and the voltage information and temperature information of the battery cells can be transmitted to the external BMS (battery management system) through the module connector 430.

[0184] The module connector 430 can be mounted on the first sealing cover 420. At this time, the module connector 430 can be mounted by being coupled to the first sealing cover 420 via the coupling member 440. At least a part of the module connector 430 can be exposed to the outside of the first end plate 510 to be described later, and the first end plate 510 can be provided with a module connector opening 530 for this purpose.

[0185] The first sealing cover 420 can be provided with a terminal bus bar 340. The terminal bus bar 340 can include a first terminal bus bar 341 and a second terminal bus bar 343, and the first terminal bus bar 341 and the second terminal bus bar 343 can have different polarities.

[0186] The terminal bus bar 340 is electrically connected to the bus bar or the electrode lead, and thus can be used to electrically connect one battery module 100 to another battery module 100. The first terminal bus bar 341 and the second terminal bus bar 343 can be respectively connected to the first outermost electrode lead 130a1 (see Figure 15 ) located at one end of the first sub-module 100a and the first electrode lead 130a6 (see Figure 15 ) adjacent thereto. In order to electrically connect one battery module 100 to another battery module 100 outside, at least a part of the terminal bus bar 340 can be exposed to the outside of the end plate 510 to be described later, and the end plate 500 can be provided with a terminal bus bar opening 520 for this purpose.

[0187] The terminal bus bar 340 may further include a protrusion protruding from the outer surface of the first sealing cover 420. The protrusion may expose the terminal bus bar opening 520, which will be described later, to the outside of the battery module 100. The terminal bus bar 340 may be connected to another battery module 100 or a BDU (Battery Disconnect Unit) through the protrusion exposed via the terminal bus bar opening 520, and may form an HV (High Voltage) connection therewith.

[0188] Figure 17 is a view showing Figure 16 the assembly process of the first sealing assembly. Figure 17 (a) of is a view showing the state in which the module connector is coupled to the first sealing cover. Figure 17 (b) of is a view showing the state in which the sensing unit is coupled to the first sealing cover. Figure 17 (c) of is a view showing the state in which both the module connector and the sensing unit are coupled to the first sealing cover.

[0189] Referring to Figure 17 (a) of, Figure 17 (b) of, and Figure 17 (c) of, the module connector 430 is mounted on one surface of the first sealing assembly 410, and the sensing unit 360 is mounted on the other surface of the first sealing assembly 410 such that the module connector 430 and the sensing unit 360 can be electrically connected to each other.

[0190] The module connector 430 may be mounted on one surface of the first sealing cover 420. Specifically, the module connector 430 may be mounted on the outer surface 420a of the first sealing cover 420. The outer surface 420a of the first sealing cover 420 is the surface facing the first end plate 510 (see Figure 19 ) to be described later, and may be the surface opposite to the surface facing the module frame 200 (see Figure 16 ).

[0191] Referring to Figure 17 (a) of, the module connector 430 may be mounted and located in the 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 passing through the first sealing cover 420 is provided at the center of the fourth region A4, and a groove for mounting the coupling member 440 may be provided at the top of the fourth region A4. In this case, the coupling member 440 may be provided at the top 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 may be coupled to the groove in the fourth region A4, whereby the module connector 430 may be mounted in the fourth region A4.

[0192] The coupling member 440 can be any material for coupling and fixing the module connector 430 to the fourth region A4, and for example, can be a bolt, a nut, or a rivet.

[0193] Referring to Figure 17 (b) of Figure 17 and (c) of Figure 16 , the sensing unit 360 can be installed on another surface of the first sealing cover 420. Specifically, the sensing unit 360 can be installed on the inner surface 420b of the first sealing cover 420. The inner surface 420b of the first sealing cover 420 is a surface facing the module frame 200 (see Figure 19 ), and can be a surface opposite to the surface facing the end plate 510 (see

[0194] The sensing unit 360 can 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 can be electrically connected to the module connector 430. The sensing printed circuit board 361 can be located in a region corresponding to the module connector 430. Specifically, the sensing printed circuit board 361 can be located in the fourth region A4. The sensing printed circuit board 361 can be disposed while being electrically connected to the module connector 430 through a hole in the fourth region A4.

[0195] The sensing cable 363 is a cable electrically connected to the sensing printed circuit board 361, and can include a cable connection portion 363a and a cable extension portion 363b.

[0196] The cable connection portion 363a is connected to the sensing printed circuit board 361, and can be disposed while being in contact with the inner surface 420b of the first sealing cover 420. The cable connection portion 363a is fixedly disposed while being in contact with the inner surface 420b of the first sealing cover 420, and does not move arbitrarily within the battery module 100, which will not cause damage to components.

[0197] Specifically, the cable connection portion 363a extends from the sensing printed circuit board 361 to the lower part of the first sealing cover 420, and can be bent and extended from the lower part of the first sealing cover 420. At this time, the portion extending from the cable connection portion 363a while being bent from the lower part of the first sealing cover 420 can be defined as the cable extension portion 363b.

[0198] The cable extension portion 363b can be electrically connected to the first flexible printed circuit board 350a located in the bus bar assembly, and details will be described later with reference to Figure 18 .

[0199] Figure 18 shows Figure 16A diagram of the process of installing the first sealing assembly on a surface of the module frame. Figure 18 (a) thereof is a diagram showing the electrical connection between the sensing cable and the flexible printed circuit board. Figure 18 (b) thereof is a diagram showing the combination of the first sealing assembly and the module frame. Figure 18 (c) thereof is a diagram showing the sealing of the first sealing assembly and the module frame.

[0200] Referring together Figure 17 to (c) of Figure 18 and (a) of

[0201] the sensing cable 363 can be electrically connected to the flexible printed circuit board 350a located on the bus bar structure. In this case, the sensing cable 363 can transmit voltage information, temperature information, etc. of the battery cells obtained from the first flexible printed circuit board 350a to the sensing printed circuit board 361. In this case, the sensing printed circuit board 361 can transmit the above information, etc. obtained from the first flexible printed circuit board 350a to the module connector 430. That is, the sensing unit 360 can transmit the battery cell data obtained from the first flexible printed circuit board 350a to the module connector 430.

[0202] Referring Figure 18 to (a) of Figure 18 and (b) of

[0203] the first sealing cover 420 can be installed on the module frame 200 while covering an open surface of the module frame 200. In one example, the first sealing cover 420 can be assembled with the module frame 200. In this case, the edge of the first sealing cover 420 may include a protruding portion that partially protrudes in the direction of combination with the module frame 200. A step may be formed on the edge of the module frame 200 combined with the first sealing cover 420 so that the protruding portion of the edge of the first sealing cover 420 can be inserted. Therefore, the first sealing cover 420 and the module frame 200 can be assembled together. Figure 18In (c) thereof, when the first sealing cover 420 and the open side of the module frame 200 are combined with each other, the first sealing member 610 can be inserted along the edges of the first sealing cover 420 and the module frame 200. When the first sealing cover 420 is combined with the module frame 200, due to assembly tolerances, a small gap may be generated between the first sealing cover 420 and the module frame 200, and this small gap is sealed with the first sealing member 610 to improve the sealing force of the battery module 100. Therefore, leakage of the refrigerant located inside the battery module 100 can be prevented, leakage of the gas generated inside the battery module 100 can be prevented, and the direction of gas discharge can be controlled, thereby improving the safety of the battery module 100.

[0204] In this case, for example, the first sealing member 610 can be an adhesive tape.

[0205] Although not shown in the figure, after the first sealing assembly 410 is combined with the module frame 200 and the edges are sealed with the first sealing member 610, other gaps existing in the first sealing assembly 410 can be sealed with a second sealing member 620 (see Figure 21 ). This is to seal the portions other than the edges of the first sealing assembly 410 that cannot be sealed with the first sealing member 610 using the second sealing member 620 and further improve the sealing performance of the battery module 100. The second sealing member 620 will be described in more detail with reference to Figure 21 .

[0206] Figure 19 is an exploded perspective view showing a state in which a first end plate according to an embodiment of the present disclosure is mounted on a first sealing assembly.

[0207] Referring to Figure 19 , in the battery module 100 according to an embodiment of the present disclosure, the first end plate 510 can be positioned to cover the first sealing assembly 410.

[0208] The first end plate 510 can include a terminal bus bar opening 520, a module connector opening 530, and an inlet opening 540.

[0209] The terminal bus bar opening 520 can be an opening formed in a region corresponding to the position of the terminal bus bar 340 provided in the first sealing assembly 410. The terminal bus bar opening 520 has a shape protruding from the first end plate 510 toward the outside of the battery module 100, and only the upper surface of this protruding shape can be open. A part of the terminal bus bar 340 can be exposed to the outside through this opening.

[0210] The size of the terminal bus bar opening 520 can be mainly determined by the outer peripheral size of the terminal bus bar 340. However, for ease of assembly or for manufacturing process reasons, the size of the terminal bus bar opening 520 can be larger than the size of the exposed portion of the terminal bus bar 340, and a gap may be generated between the terminal bus bar opening 520 and the terminal bus bar 340 exposed to the outside.

[0211] The module connector opening 530 and the inlet opening 540 are openings provided in the first end plate 510 and are holes passing through the first end plate 510. Specifically, the module connector opening 530 can be an opening formed in a region corresponding to the position of the module connector 430 provided in the first sealing assembly 410, and the inlet opening 540 can be an opening formed in a region corresponding to the position of the inlet 421 provided in the first sealing assembly 410. Thus, even when the first end plate 510 is installed, at least a part of the module connector 430 and the inlet 421 can pass through the module connector opening 530 and the inlet opening 540 and be exposed to the outside.

[0212] The sizes of the module connector opening 530 and the inlet opening 540 can be mainly determined by the outer peripheral sizes of the module connector 430 and the inlet 421. However, for ease of assembly or for manufacturing process reasons, the sizes of the module connector opening 530 and the inlet opening 540 can be larger than the sizes of the exposed portions of the module connector 430 and the inlet 421. At this time, gaps may be generated between the module connector opening 530 and the exposed portion of the module connector 430 and between the inlet opening 540 and the exposed portion of the inlet 421.

[0213] The terminal bus bar 340 and the module connector 430 are exposed to the outside through the terminal bus bar opening 520 and the module connector opening 530, so that the HV connection and the LV connection with external electronic components can be easily performed. Therefore, the efficiency of the assembly process can be improved.

[0214] The inlet 421 is exposed to the outside of the battery module 100 through the inlet opening 540. Therefore, when the refrigerant flows in 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 can be prevented from coming into contact with the terminal bus bar 340 or the module connector 430 that performs external electrical connection. That is, a short circuit between components can be prevented, and the safety of the battery module 100 can be improved.

[0215] The third sealing member 630 can be inserted between the first end plate 510 and the first sealing assembly 410.

[0216] The third sealing member 630 may be formed in a shape corresponding to the edge of the first sealing assembly 410 or the edge of the first end plate 510. The third sealing member 630 may be a resin that is coated and then cured to correspond to the edge of the first sealing assembly 410 or the edge of the first end plate 510. Specifically, the third sealing member 630 may be coated on the first groove 411 that is a groove formed along the edge of the first sealing assembly 410, and may be cured after the first sealing assembly 410 and the first end plate 510 are joined. In one example, the third sealing member 630 may include an epoxy resin.

[0217] That is, the third sealing member 630 is inserted between the first sealing assembly 410 and the first end plate 510, so that the first sealing assembly 410 and the first end plate 510 can be joined without a gap formed due to assembly tolerances.

[0218] Therefore, the sealing performance of the battery module 100 is improved, leakage of the refrigerant located within the battery module 100 is prevented, and thus the cooling performance of the battery module 100 can be enhanced. In addition, within the battery module 100, it is possible to prevent the exhaust gas generated under conditions above a specified temperature and pressure from being discharged to the outside through the gap while adjusting the exhaust gas direction, thereby improving the safety of the battery module 100.

[0219] The type and formation method of the third sealing member 630 are not limited to the above type and formation method, and may have a shape such as a gasket formed of an elastic member, and any shape is available as long as it can be used to seal the first sealing assembly 410 and the first end plate 510.

[0220] Figure 20 is a view of the configuration other than the first end plate when viewed in the -x axis direction along the yz plane in Figure 19 In Figure 21 is a cross-sectional view showing a portion corresponding to A5 in a cross-section taken along the cutting line B-B' in Figure 20 In

[0221] Refer to Figure 20 and Figure 21 In

[0222] Regarding the second sealing member 620, refer to Figure 21, the second sealing member 620 may be located in an area other than the edge area of the first sealing assembly 410. That is, the second sealing member 620 can seal the remaining area of the first sealing assembly 410 that is not covered by the first sealing member 610 and the third sealing member 630. Specifically, the second sealing member 620 may seal an area of the first sealing assembly 410 that includes a gap. However, the area where the second sealing member 620 is located is not limited to the area shown in this figure. For example, the second sealing member 620 may seal a part of the area including a gap in the area of the first sealing assembly 410 combined with the module connector 430.

[0223] In addition to the edge portion of the first sealing assembly 410, the portion where the gap is located is further sealed by the second sealing member 620, so that the sealing performance of the battery module 100 is improved, and thus the leakage of the refrigerant located in the battery module 100 is prevented. Thereby, the cooling performance of the battery module 100 can be improved. In addition, since the gas generated in the battery module 100 above a specified temperature and pressure does not escape through the gap between the first sealing assembly 410 and the first end plate 510, the safety of the battery module 100 can be enhanced.

[0224] Figure 22 FIG. is a diagram showing a state in which a second sealing assembly is mounted on the other side of a module frame according to an embodiment of the present disclosure.

[0225] Refer to Figure 5 , Figure 6 and Figure 22 , the battery module 100 according to an embodiment of the present disclosure may include a second sealing assembly 450 mounted on the other open surface of the module frame 200. Specifically, in the battery module 100 according to this embodiment, the second bus bar assembly 300b electrically connected to the battery cell assembly may be located on the other open side of the module frame 200, and the second sealing assembly 450 may be mounted while covering the second bus bar assembly 300b.

[0226] The second sealing assembly 450 may include: a second sealing cover 460 covering the other open surface of the module frame 200; and an outlet 461, which is a hole formed in the second sealing cover 460.

[0227] The second sealing cover 460 is a plate covering the other open surface of the module frame 200, and may have a size corresponding to the size of the other open surface of the module frame 200. That is, the second sealing cover 460 can cover the other open surface of the module frame 200 while being mounted on the module frame 200. In one example, the second sealing cover 460 may be assembled with the module frame 200.

[0228] The outlet 461 may be a hole formed in a region of the second sealing cover 460. The outlet 461 may be a hole in a form that protrudes along the outer surface (-x axis direction) of the second sealing cover 460. That is to say, the outlet 461 may be a hole in a form that protrudes in a direction opposite to the direction where the module frame 200 is located. The protruding outlet 461 may pass through an outlet opening 560 formed in the second end plate 550 which will be described later.

[0229] The outlet 461 may be located above the central portion based on the height of the battery cell stack 120. The outlet 461 may be located adjacent to the upper end portion of the second sealing assembly 450. Specifically, the outlet 461 may be located above the central portion based on the height of the second sealing assembly 450. Although the position of the outlet 461 is not limited to this, it can ensure that the interior of the module frame 200 is sufficiently filled with the refrigerant. Here, the height of the battery cell stack 120 or the second sealing assembly 450 refers to the length in the z-axis direction in the figure.

[0230] Considering the positions of the inlet 421 and the outlet 461 comprehensively above, the inlet 421 may be located below the central portion based on the height of the battery cell stack 120, and the outlet 461 may be located above the central portion based on the height of the battery cell stack 120. That is to say, the inlet 421 may be located adjacent to the lower end of the first sealing assembly 410, and the outlet 461 may be located adjacent to the upper end of the second sealing assembly 450.

[0231] If the inlet 421 is located above the central portion based on the height of the battery cell stack 120, the refrigerant flows into the interior of the battery module 100 as if falling from a high position, and bubbles may be generated inside the refrigerant. Such bubbles will be a factor hindering the cooling effect.

[0232] In addition, if the outlet 461 is located below the central portion based on the height of the battery cell stack 120, the refrigerant flowing into the battery module 100 is only filled up to the height of the outlet 461 and then escapes to the outside. Therefore, the interior of the battery module 100 may not be filled with a sufficient amount of refrigerant, which may lead to a reduction in cooling performance.

[0233] Therefore, in order to prevent bubbles from being generated in the flowing refrigerant and the interior of the battery module 100 from being filled with the refrigerant, the inlet 421 is preferably located below the central portion based on the height of the battery cell stack 120, and the outlet 461 is preferably located above the central portion based on the height of the battery cell stack 120.

[0234] When the second sealing assembly 450 is combined with the other open surface of the module frame 200, the first sealing member 610 can be inserted along the edges of the second sealing cover 460 and the module frame 200. When the second sealing cover 460 is combined with the module frame 200, due to assembly tolerances, a slight gap may be generated between the second sealing cover 460 and the module frame 200, and this gap is sealed by the first sealing member 610, thereby improving the sealing performance of the battery module 100. Therefore, it is possible to prevent exhaust gas leakage occurring inside the battery module 100 while preventing leakage of the refrigerant located inside the battery module 100, and it is also possible to control the discharge direction of the gas, thereby improving the safety of the battery module 100.

[0235] In this case, for example, the first sealing member 610 can be an adhesive tape.

[0236] Although not shown in the figures, after the second sealing assembly 450 is combined with the module frame 200 and the edges are sealed by the first sealing member 610, the gaps present on the second sealing assembly 450 can be sealed by the second sealing member 620 (see Figure 25 ). This is to use the second sealing member 620 to seal the portions other than the edges of the second sealing assembly 450 that cannot be sealed by the first sealing member 610, and to further improve the sealing performance of the battery module 100. The second sealing member 620 will be described in more detail with reference to Figure 25 .

[0237] Figure 23 is an exploded perspective view showing the state in which the second end plate is mounted on the second sealing assembly according to an embodiment of the present disclosure.

[0238] Referring to Figure 23 , in the battery module 100 according to an embodiment of the present disclosure, the second end plate 550 can be positioned to cover the second sealing assembly 450.

[0239] The second end plate 550 can be formed with an outlet opening 560.

[0240] The outlet opening 560 is an opening provided in the second end plate 550, and the outlet opening 560 is a hole passing through the second end plate 550. Specifically, the outlet opening 560 can be an opening formed in a region corresponding to the position of the outlet 461 provided in the second sealing assembly 450. Thus, even when the second end plate 550 is installed, at least a part of the outlet 461 can pass through the outlet opening 560 and be exposed to the outside.

[0241] The size of the outlet opening 560 can be mainly determined by the outer peripheral size of the outlet 461. However, for ease of assembly or for manufacturing process reasons, the size of the outlet opening 560 can be larger than the size of the exposed portion of the outlet 461, and a gap may be generated between the outlets 461 exposed to the outside of the outlet opening 560.

[0242] The outlet 461 is exposed to the outside of the battery module 100 through the outlet opening 560. Therefore, when the refrigerant flowing into the module frame 200 is discharged to the outside through the outlet 461, refrigerant leakage between the second sealing assembly 450 and the second end plate 550 can be prevented. Thus, the battery module 100 does not come into contact with other electronic components to prevent short circuits, thereby improving the safety of the battery module 100.

[0243] The third sealing member 630 can be inserted between the second end plate 550 and the second sealing assembly 450.

[0244] The third sealing member 630 can be formed into a shape corresponding to the edge of the second sealing assembly 450 or the edge of the second end plate 550. The third sealing member 630 can be a resin that is coated and then cured to correspond to the edge of the second sealing assembly 450 or the edge of the second end plate 550. Specifically, the third sealing member 630 can be coated onto the second groove 451 that is formed as a groove along the edge of the second sealing assembly 450 and can be cured after the second sealing assembly 450 and the second end plate 550 are joined. As an example, the third sealing member 630 can be made of epoxy resin.

[0245] That is, the third sealing member 630 is inserted between the second sealing assembly 450 and the second end plate 550, so that the second sealing assembly 450 and the second end plate 550 can be joined without forming a gap due to assembly tolerances.

[0246] Therefore, the sealing performance of the battery module 100 is improved, preventing leakage of the refrigerant located within the battery module 100, and thus the cooling performance of the battery module 100 can be enhanced. In addition, within the battery module 100, while preventing gas generated above a specified temperature and pressure from being discharged to the outside through the gap, the exhaust direction can be adjusted, thereby improving the safety of the battery module 100.

[0247] The type and formation method of the third sealing member 630 are not limited to the above type and formation method, and can have a shape such as a washer formed by an elastic member, and any shape is available as long as it can be used to seal the second sealing assembly 450 and the second end plate 550.

[0248] Figure 24 is at Figure 23A view of the configuration excluding the second end plate when observed along the x-axis direction in the yz plane. Figure 25 It shows when along Figure 24 A cross-sectional view of the portion corresponding to A6 in the cross-section taken along the cutting line C-C’ in

[0249] Referring to Figure 24 and Figure 25 The first sealing member 610 and the third sealing member 630 can be positioned along the edge of the second sealing assembly 450, and the second sealing member 620 can be located in a region of the second sealing assembly 450.

[0250] Regarding the second sealing member 620, refer to Figure 25 The second sealing member 620 can be located in a region of the second sealing assembly 450 other than the edge region. That is, the second sealing member 620 can seal the remaining region of the second sealing assembly 450 not covered by the first sealing member 610 and the third sealing member 630. Specifically, the second sealing member 620 can seal a region including a gap in the first sealing assembly 410. However, the region where the second sealing member 620 is located is not limited to the region shown in this figure.

[0251] Except for the edge portion of the second sealing assembly 450, the portion where the gap is located is further sealed by the second sealing member 620, thereby improving the sealing performance of the battery module 100 and preventing the leakage of the refrigerant located inside the battery module 100. Therefore, the cooling performance of the battery module 100 can be improved. In addition, since the gas generated inside the battery module 100 above a specified temperature and pressure does not escape through the gap between the second sealing assembly 450 and the second end plate 550, the safety of the battery module 100 can be enhanced.

[0252] Figure 26 It is an exploded perspective view of a second sealing assembly according to another embodiment of the present disclosure. Figure 27 It is a view when observed along the -x-axis direction in the yz plane Figure 26 at this time.

[0253] Referring to Figure 26 and Figure 27 The second sealing assembly 450 according to another embodiment of the present disclosure may further include an outlet 461 and a module exhaust portion 470. Since the outlet 461 is the same as the above, the module exhaust portion 470 will be mainly described.

[0254] The module exhaust part 470 can discharge the gas generated inside the battery module 100 to the outside when the temperature and pressure are above specific values. Specifically, the module exhaust part 470 can prevent the refrigerant inside the battery module 100 from leaking while discharging the gas inside the battery module 100 to the outside.

[0255] The module exhaust part 470 can be provided in an area of the second sealing cover 460. The module exhaust part 470 can include an exhaust hole 471, a film 473, a fixing cover 475, and an exhaust protrusion 477.

[0256] The exhaust hole 471 can be a passage through which the gas generated inside the battery module 100 moves to the outside. The exhaust hole 471 can be at least one hole provided in an area of the second sealing cover 460. The exhaust hole 471 can be structurally connected to the module connection part 472 described later in Figure 28 and details will be described in detail in Figure 28

[0257] The film 473 can be a thin film that allows the gas located inside the battery module 100 to be discharged to the outside through the exhaust hole 471 but prevents the refrigerant from leaking to the outside.

[0258] The film 473 can be located between the inner surface 460b of the second sealing cover 460 and the fixing cover 475. The position of the film 473 can be set in contact with the inner surface 460b of the second sealing cover 460. In this case, one surface of the film 473 can be fixedly set while being in contact with the inner surface 460b of the second sealing cover 460, and the other surface of the film 473 can be fixedly set while being in contact with one surface of the fixing cover 475.

[0259] The fixing cover 475 can allow the gas and refrigerant located inside the battery module 100 to pass through it at once. The position of the fixing cover 475 can be set to be closest to the battery cell assembly.

[0260] The position of the fixing cover 475 can be set to be in contact with the film. Specifically, one surface of the fixing cover 475 can be adhered and fixed to the other surface of the film 473. In this case, the size of the fixing cover 475 can correspond to the size of the film 473 or can be larger than the size of the film 473.

[0261] The fixing cover 475 can have a shape in which holes are provided in a flat plate. However, the holes may not be located in the edge area of the fixing cover 475.

[0262] ​The edge region of the fixed cover 475 can be in contact with at least one of the film 473 and the inner surface 460b of the second sealing cover 460. In this case, although not shown in this figure, the adhesive member can be inserted along the edge region of the fixed cover 475, and the fixed cover 475 can be fixed to the second sealing cover 460 by the adhesive member. The holes provided in the fixed cover 475 can allow the gas and refrigerant located inside the battery module 100 to move to the film 473.

[0263] The exhaust protrusion 477 can be a region where the region corresponding to the module exhaust portion 470 protrudes toward the outside (x-axis direction) of the battery module 100. The exhaust protrusion 477 can be a region that extends outwardly and protrudingly from a region provided with the exhaust hole 471. A part of the exhaust protrusion 477 can pass through the second end plate 550 and be exposed to the outside, so that the exhaust can be completely discharged to the outside of the battery module 100. Details will be described in more detail based on Figure 28 More details will be described.

[0264] Figure 28 It is a diagram showing the state in which the second end plate is combined with Figure 26 the second sealing assembly.

[0265] Refer to Figure 28 , when the second end plate 550 is installed while covering the second sealing assembly 450, at least a part of the outlet 461 and the module exhaust portion 470 can pass through the second end plate 550 and be exposed to the outside.

[0266] Specifically, the outlet 461 can be partially exposed to the outside through the outlet opening 560 provided in the second end plate 550. The module exhaust portion 470 can pass through the exhaust opening 570 provided in the second end plate 550 and be partially exposed to the outside.

[0267] Since the outlet 461 and the outlet opening 560 are the same as the above-mentioned components in Figure 23 , the detailed description will be omitted, and the module exhaust portion 470 and the exhaust opening 570 will be described in detail.

[0268] The module exhaust portion 470 includes the exhaust protrusion 477 that protrudes outward through the exhaust opening 570, and the exhaust protrusion 477 can be provided with the module connection portion 472.

[0269] The module connection part 472 is a hole communicating with the above-mentioned exhaust hole 471, and like the exhaust protrusion part 477, the module connection part 472 can pass through the exhaust opening 570 of the second end plate 550 and be partially exposed to the outside. The module connection part 472 is connected to a battery pack exhaust device (not shown) of the battery pack, so that the exhaust gas moving through the exhaust hole 471 can be discharged to the outside of the battery module. At this time, at least a part of the module connection part 472 passes through the second end plate 550 and is exposed to the outside, thus facilitating the assembly with the battery pack exhaust device. Therefore, the efficiency of the battery assembly process can be improved. In addition, the exhaust gas discharged through the module connection part 472 may not be retained in the space between the second end plate 550 and the second sealing assembly 450. Therefore, since the exhaust gas is not retained inside the battery module 100, the safety of the battery module 100 can be improved.

[0270] The exhaust opening 570 is an opening provided in the second end plate 550, and the exhaust opening 570 is a hole passing through the second end plate 550. Specifically, the exhaust opening 570 may be an opening formed in a region corresponding to the position of the exhaust protrusion part 477 provided in the second sealing assembly 450. In this case, the exhaust protrusion part 477 and the module connection part 472 pass through the exhaust opening 570 together, so that at least a part of the exhaust protrusion part 477 and the module connection part 472 can be exposed to the outside.

[0271] The size of the exhaust opening 570 may be mainly determined by the outer peripheral size of the exhaust protrusion part 477. However, for the convenience of assembly or for manufacturing process reasons, the size of the exhaust opening 570 may be larger than the size of the exposed part of the exhaust protrusion part 477, and a gap may be generated between the exhaust opening 570 and the exhaust protrusion part 477 exposed to the outside.

[0272] Next, reference will be made to Figure 29 and Figure 31 to describe in detail various forms of the insulating plate according to an embodiment of the present disclosure.

[0273] Figure 29 is a partial perspective view of the insulating plate located between the first battery cell stack and the second battery cell stack in Figure 11 shown in an enlarged manner.

[0274] Referring to Figure 11 and Figure 29 , the insulating plate 700 according to an embodiment of the present disclosure may be in a form surrounding an opening 700H formed in the center of the insulating plate 700. As described above, the refrigerant can pass through the opening 700H formed in the center of the insulating plate 700 and flow from the first battery cell stack 120a to the second battery cell stack 120b.

[0275] Figure 30is a partial perspective view showing an insulating plate included in a battery module according to another embodiment of the present disclosure.

[0276] Referring together Figure 4 and Figure 30 , in the insulating plate 700' according to another embodiment of the present disclosure, the first through-hole 700H1 and the second through-hole 700H2 shown as Figure 29 may not be formed, but only the opening 700H may be formed.

[0277] The insulating plate 700' according to the present embodiment does not have an electrical connection between the first battery cell stack 120a and the second battery cell stack 120b. Instead, the first battery cell stack 120a and the second battery cell stack 120b can be separately applied to a model of a battery module for achieving electrical connection with external electronic components. In the battery module of the present embodiment, the HV connection and the LV connection in the first battery cell stack 120a can be formed independently of the second battery cell stack 120b. Similarly, the HV connection and the LV connection in the second battery cell stack 120b can be formed independently of the first battery cell stack 120a.

[0278] Therefore, since it is not necessary to perform the HV connection and the LV connection between the first battery cell stack 120a and the second battery cell stack 120b, it is not necessary to form the first through-hole and the second through-hole in the insulating plate 700'.

[0279] Next, referring to Figure 31 and Figure 32 , the effects, detailed forms, etc. of the insulating plate according to the present embodiment will be described in detail.

[0280] Figure 31 (a) of Figure 31 and (b) of

[0281] are diagrams respectively showing a cross-section of a battery module according to a comparative example of the present disclosure and a cross-section of a battery module according to an embodiment of the present disclosure. Figures 4 to 6 , Figure 11 and Figure 31 Referring together to (a) of

[0282] , the battery module 100CE according to the comparative example of the present disclosure includes a first battery cell stack 120a, a second battery cell stack 120b, a module frame 200, a first end plate 510, and a second end plate 550. Since it is repetitive with the above content, the detailed description of each component included in the battery module 100CE is omitted. At this time, different from the battery module according to the present embodiment, in the battery module 100CE according to this comparative example, an insulating plate is not inserted between the first battery cell stack 120a and the second battery cell stack 120b.

[0282] Refrigerant C flows into the internal space of the module frame 200 through the inlet 421 formed in the first end plate 510, and the flowing-in refrigerant C flows along the internal space of the module frame 200 and then is discharged through the outlet 461 of the second end plate 550. The first battery cell stack 120a and the second battery cell stack 120b are immersed in the refrigerant C.

[0283] At this time, the battery module 100CE has a structure extending along the length direction including the first battery cell stack 120a and the second battery cell stack 120b. In such a configuration, the space S between the first battery cell stack 120a and the second battery cell stack 120b may be a region where the flow of the refrigerant C stagnates. Since the refrigerant C flows along the hollow space S, the flow velocity is slow, and in severe cases, the flow of the refrigerant C stagnates. If the flow of the refrigerant stagnates, the cooling performance and cooling efficiency of the corresponding battery module 100CE may be reduced.

[0284] Refer to together Figures 4 to 6 、 Figure 11 and Figure 31 In the case of the battery module 100 according to the present embodiment, the problem of the comparative example can be solved by the insulating plate 700 disposed between the first battery cell stack 120a and the second battery cell stack 120b. In the battery module 100 according to the present embodiment, the insulating plate 700 having the opening 700H formed therein can be disposed in the space S between the first battery cell stack 120a and the second battery cell stack 120b.

[0285] The refrigerant C flowing through the opening 700H of the insulating plate 700 means that the refrigerant C flows through a relatively narrow region compared with the comparative example. That is to say, as the refrigerant C flows through a relatively narrow region, its flow velocity increases, and the stagnation of the refrigerant C can be prevented. Finally, as the flow blockage of the refrigerant C is eliminated, the cooling performance and cooling efficiency of the battery module 100 can be improved. That is to say, the insulating plate 700 according to the present embodiment ensures the insulation distance between the first battery cell stack 120a and the second battery cell stack 120b, thereby preventing short circuits, and at the same time eliminating the flow blockage of the refrigerant C between the first battery cell stack 120a and the second battery cell stack 120b, thereby enhancing the cooling performance and cooling efficiency.

[0286] In addition, as described above, the opening 700H can be formed in such a manner that the area thereof is 5% or more and 60% or less of the area of one surface of the insulating plate 700. The range of the opening area ratio of the opening 700H is related to the function of eliminating the flow blockage of the refrigerant C. Since this range is repeated with the above content, its detailed description will be omitted.

[0287] Figure 32is a perspective view showing an insulating plate according to an embodiment disclosed.

[0288] Referring to Figure 9 , Figure 11 and Figure 32 , in the insulating plate 700 according to the present embodiment, an opening 700H is formed, and a first through hole 700H1, a second through hole 700H2, etc. may be further formed as needed. The opening 700H may be formed in the center of the insulating plate 700. Specifically, the length L1 from the upper side 700U of the insulating plate 700 to the upper side 700HU of the opening 700H may be 25% or more and 49% or less with respect to the length H in the height direction of the insulating plate 700. In addition, the length L2 from the lower side 700L of the insulating plate 700 to the lower side 700HL of the opening 700H may be 25% or more and 49% or less with respect to the length H in the height direction of the insulating plate 700. Here, the height direction of the insulating plate 700 refers to the direction between the upper side 700U and the lower side 700L of the insulating plate 700. More specifically, the height direction of the insulating plate 700 is the direction in which the battery cells 110 are stacked in the first battery cell stack 120a and the second battery cell stack 120b (the direction parallel to the y-axis) and the direction in which the first battery cell stack 120a and the second battery cell stack 120b are arranged (the direction parallel to the x-axis), and may be the direction parallel to the z-axis direction. The opening 700H may be formed in the center of the insulating plate 700 while satisfying the above range.

[0289] In addition, the opening 700H may be open in a rectangular shape with the upper side 700HU and the lower side 700HL longer than the two side edges 700HS. In addition, one or more openings 700H may be formed in the insulating plate 700. The plurality of openings 700H may be positioned along the width direction of the insulating plate 700. Here, the width direction of the insulating plate 700 refers to the direction between the two side edges 700S of the insulating plate 700, and since it is parallel to the direction in which the battery cells 110 are stacked in the battery cell stacks 120a and 120b, it may be the direction parallel to the y-axis. As an example, in Figure 32 , a state in which the opening 700H is positioned along the width direction of the insulating plate 700 is shown.

[0290] Next, referring to Figures 33 to 36 , the insulating plate 700” according to a modified embodiment of the present disclosure will be described in detail.

[0291] Figure 33 and Figure 34 are a perspective view and a front view of an insulating plate according to a modified embodiment of the present disclosure. Figure 35 is Figure 34 a cross-sectional view taken along the cutting line D-D’ of Figure 36 is a view showing, in an enlarged manner, Figure 35A partial view of the corresponding part of A7 in

[0292] Refer to together Figures 33 to 36 , in the insulating plate 700” of a modified embodiment according to the present disclosure, an opening 700H is formed. At this time, an inclined surface 700C may be formed in at least one of the upper region or the lower region of the opening 700H of the insulating plate 700”. That is, an inclined surface 700C may be formed in the upper region or the lower region of the opening 700H of the insulating plate 700” or an inclined surface 700C may be formed in both the upper region and the lower region of the opening 700H of the insulating plate 700”.

[0293] Specifically, an inclined surface 700C may be formed in at least a part of the region from the upper side 700U or the lower side 700L of the insulating plate 700” to the upper side 700HU or the lower side 700HL of the opening 700H, such that the thickness of the insulating plate 700” becomes narrower as it progresses in the direction from the upper side 700U or the lower side 700L of the insulating plate 700” to the upper side 700HU or the lower side 700HL of the opening 700H. Here, the thickness of the insulating plate 700” refers to the thickness of the plate-shaped insulating plate 700” and may correspond to the length of the insulating plate 700” along the direction parallel to the x-axis direction in the figure.

[0294] More specifically, an inclined surface 700C may be formed in at least a part of the region from the upper side 700U of the insulating plate 700” to the upper side 700HU of the opening 700H, such that the thickness of the insulating plate 700” becomes narrower as it progresses in the direction from the upper side 700U of the insulating plate 700” to the upper side 700HU of the opening 700H (the -z-axis direction in the figure). In addition, an inclined surface 700C may be formed in at least a part of the region from the lower side 700L of the insulating plate 700” to the lower side 700HL of the opening 700H, such that the thickness of the insulating plate 700” becomes narrower as it progresses in the direction from the lower side 700L of the insulating plate 700” to the lower side 700HL of the opening 700H (the +z-axis direction in the figure).

[0295] That is, the inclined surface 700C may be formed in the upper region or the lower region of the opening 700H, or may be formed in both the upper region and the lower region of the opening 700H. In addition, the inclined surface 700C may be formed on either one of the two surfaces of the insulating plate 700” located on opposite sides of each other, or may be formed on the two surfaces of the insulating plate 700” located on opposite sides of each other. Here, the two surfaces of the insulating plate 700” located on opposite sides of each other refer to the surfaces of the insulating plate 700” that face the first battery cell stack 120a (see Figure 11) and each surface in the surfaces of the second battery cell stack 120b (see Figure 11 ).

[0296] Since the inclined surface 700C is formed on the insulating plate 700” according to the present embodiment, the fluidity of the refrigerant flowing through the opening 700H of the insulating plate 700” can be improved. That is, in the space between the first battery cell stack 120a (see Figure 11 ) and the second battery cell stack 120b (see Figure 11 ), the inclined surface 700C can guide the flow of the refrigerant so that the refrigerant flows better toward the opening 700H of the insulating plate 700”.

[0297] On the other hand, the inclination angle TA formed by the inclined surface 700C can be 80 degrees or more and 90 degrees or less, or can be 85 degrees or more and 87 degrees or less. As Figure 36 shown, the inclination angle TA formed by the inclined surface 700C represents an acute angle formed between the inclined surface 700C and the ground. Here, the ground can correspond to a surface parallel to the xy plane.

[0298] In the insulating plate 700” according to the present embodiment, the area, position, number, etc. of the inclined surface 700C can be appropriately changed in consideration of the degree of refrigerant flow according to the size of the internal space of the battery module 100 through which the refrigerant flows, the material characteristics of the refrigerant, etc.

[0299] On the other hand, the insulating plate 700” according to the present embodiment may include at least one rib 700R extending along the height direction of the insulating plate 700”. That is, the insulating plate 700” may include one rib 700R or a plurality of ribs 700R. When a plurality of ribs 700R are formed, the plurality of ribs 700R may be arranged to maintain a predetermined distance along the width direction. The opening 700H may be divided into a plurality by the ribs 700R.

[0300] At least one rib 700R according to the present embodiment may be provided to supplement the rigidity of the insulating plate 700”. The number or thickness of the rib 700R is not particularly limited, and can be appropriately adjusted in consideration of the size and material of the insulating plate 700”. In particular, since the thickness of the portion of the insulating plate 700” on which the inclined surface 700C is formed is thin, at least one rib 700R for supplementing rigidity may preferably be formed on the insulating plate 700” on which the inclined surface 700C is formed. However, the present disclosure is not limited thereto. For example, at least one rib 700R may be formed on the insulating plate 700 on which the inclined surface 700C is not formed Figure 32 .

[0301] On the other hand, referring again to Figure 29 , Figure 32 andFigure 33 According to the present embodiment, the insulating plates 700 and 700'' can be fixed to at least one of the first bus bar frame 310a and the second bus bar frame 310b. For example, the insulating plates 700 and 700'' according to the present embodiment can include a mounting portion 700M fixed to the first bus bar frame 310a or the second bus bar frame 310b. The mounting portion 700M can protrude from the insulating plates 700 and 700'' toward the first bus bar frame 310a or the second bus bar frame 310b, and such a mounting portion 700M can be formed with fastening holes.

[0302] As an example, a part of the mounting portion 700M can protrude toward the first bus bar frame 310a, and the remaining part of the mounting portion 700M can protrude toward the second bus bar frame 310b. Bolts can pass through the fastening holes of the mounting portion 700M protruding toward the first bus bar frame 310a and then be fastened to the first bus bar frame 310a. In addition, another bolt can pass through the fastening holes of the mounting portion 700M protruding toward the second bus bar frame 310b and then be fastened to the second bus bar frame 310b. In particular, the mounting portion 700M can be formed adjacent to the upper side 700U or the lower side 700L of the insulating plates 700 and 700''. Thus, the bolts that have passed through the mounting portion 700M can be fastened to adjacent areas on the upper side or the lower side of the first bus bar frame 310a or the second bus bar frame 310b.

[0303] In the same manner as described above, the insulating plates 700 and 700'' can be fixed to at least one of the first bus bar frame 310a and the second bus bar frame 310b. However, this is an example of fixing the insulating plates 700 and 700'' to at least one of the first bus bar frame 310a and the second bus bar frame 310b, and they can also be fixed in other ways.

[0304] In the present embodiment, terms representing directions such as the front side, the rear side, the left side, the right side, the upper side, and the lower side have been used, but the terms used are provided for convenience of description and can vary depending on the position of the object, the position of the observer, etc.

[0305] One or more battery modules according to the embodiments of the present disclosure described above can be installed together with various control and protection systems such as, for example, a BMS (Battery Management System), a BDU (Battery Disconnect Unit), and a cooling system to form a battery pack.

[0306] The battery module or the battery pack can be applied to various devices. Specifically, it can be applied to vehicle devices such as, for example, electric bicycles, electric vehicles, and hybrid electric vehicles or an ESS (Energy Storage System), and can be applied to various devices that can use secondary batteries, but is not limited thereto.

[0307] Although the present disclosure has been described in detail with reference to its preferred embodiments, the scope of the present disclosure is not limited thereto, and those skilled in the art can make various modifications and improvements using the basic concepts of the present disclosure defined in the appended claims, which also fall within the scope of the present disclosure.

[0308] [Description of Reference Numerals]

[0309] 100: Battery module

[0310] 110: Battery cell

[0311] 120: Battery cell stack

[0312] 120a: First battery cell stack

[0313] 120b: Second battery cell stack

[0314] 200: Module frame

[0315] 300a: First bus bar assembly

[0316] 300b: Second bus bar assembly

[0317] 400: Sealing assembly

[0318] 500: End plate

[0319] 610: First sealing member

[0320] 620: Second sealing member

[0321] 630: Third sealing member

[0322] 700: Insulating plate

[0323] 700H: Opening

Claims

1. A battery module, comprising: a battery cell stack including a first battery cell stack and a second battery cell stack in which a plurality of battery cells are stacked; a module frame that houses the battery cell stack; and an inlet and an outlet through which a refrigerant circulates inside the module frame, wherein the refrigerant flows into the inside of the module frame through the inlet and is discharged through the outlet, and wherein an insulating plate is disposed between the first battery cell stack and the second battery cell stack, and an opening through which the refrigerant passes is formed in the insulating plate.

2. The battery module according to claim 1, wherein: the opening is formed at the center of the insulating plate.

3. The battery module according to claim 1, wherein: the inlet and the outlet are located on opposite sides with respect to the insulating plate.

4. The battery module according to claim 3, wherein: the first battery cell stack is located between the inlet and the insulating plate, and the second battery cell stack is located between the outlet and the insulating plate.

5. The battery module according to claim 4, wherein: the refrigerant flowing in through the inlet sequentially passes through the first battery cell stack, the opening of the insulating plate, and the second battery cell stack, and is discharged through the outlet.

6. The battery module according to claim 1, wherein: the inlet is located at a position below the center portion with respect to the height of the battery cell stack, and the outlet is located at a position above the center portion with respect to the height of the battery cell stack.

7. The battery module according to claim 1, wherein: the first battery cell stack and the second battery cell stack are arranged in a direction perpendicular to the direction in which the battery cells in the first battery cell stack or the second battery cell stack are stacked.

8. The battery module according to claim 7, wherein: a first through hole and a second through hole are formed in the insulating plate, and electrical connection between the first battery cell stack and the second battery cell stack is made through the first through hole and the second through hole.

9. The battery module according to claim 1, further comprising a first sealing assembly and a second sealing assembly that respectively cover the open two sides of the module frame, wherein, the inlet is formed in the first sealing assembly, and the outlet is formed in the second sealing assembly.

10. The battery module according to claim 9, wherein: the inlet is located at a position below the center portion with respect to the height of the first sealing assembly, and the outlet is located at a position above the center portion with respect to the height of the second sealing assembly.

11. The battery module according to claim 9, wherein: the battery cell is a pouch-type battery cell and includes electrode leads protruding in two directions, and When the direction between the electrode leads is defined as the length direction, the first sealing assembly, the first battery cell stack, the insulating plate, the second battery cell stack, and the second sealing assembly are arranged in sequence along the length direction.

12. The battery module according to claim 1, wherein: The refrigerant is insulating oil.

13. The battery module according to claim 1, wherein: The refrigerant is in direct contact with the battery cell stack accommodated in the module frame.

14. The battery module according to claim 1, wherein: The insulating plate has a configuration in which the insulating plate surrounds the outer periphery of the opening formed in the center of the insulating plate.

15. The battery module according to claim 1, wherein: The opening is formed so as to have an area of 5% or more and 60% or less with respect to the area of one surface of the insulating plate.

16. The battery module according to claim 1, wherein: The length from the upper side of the insulating plate to the upper side of the opening is 25% or more and 49% or less of the length in the height direction of the insulating plate, and The length from the lower side of the insulating plate to the lower side of the opening is 25% or more and 49% or less of the length in the height direction of the insulating plate.

17. The battery module according to claim 1, wherein: In at least a part of the region from the upper side of the insulating plate to the upper side of the opening, an inclined surface is formed so that the thickness of the insulating plate becomes narrower as it progresses in the direction from the upper side of the insulating plate to the upper side of the opening.

18. The battery module according to claim 1, wherein: In at least a part of the region from the lower side of the insulating plate to the lower side of the opening, an inclined surface is formed so that the thickness of the insulating plate becomes narrower as it progresses in the direction from the lower side of the insulating plate to the lower side of the opening.

19. The battery module according to claim 1, wherein: The insulating plate includes at least one rib extending in the height direction of the insulating plate.

20. The battery module according to claim 1, further comprises: A first bus bar frame located on one surface of the first battery cell stack; And a second bus bar frame located on one surface of the second battery cell stack, wherein the insulating plate is fixed to at least one of the first bus bar frame and the second bus bar frame.

21. A battery pack comprising the battery module according to claim 1.

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