Battery Module Comprising Insulation Oil and Battery Pack Comprising the Same

Abstract

The present invention relates to a battery module comprising a battery cell stack composed of a plurality of battery cells, a module housing for accommodating one or more of the battery cell stacks arranged along an electric field direction, a High Voltage Connector (HV) for electrically connecting the battery modules, a Low Voltage Assembly (LV) for sensing the voltage and temperature of the plurality of battery cells, an insulating oil for cooling the plurality of battery cells, and a cooling port for the inflow and outflow of the insulating oil, wherein the insulating oil flows inside the module housing and directly cools the plurality of battery cells, thereby improving cooling efficiency and energy density, and to a battery pack including the same.

Description

Technology Field

[0001] The present invention relates to a battery module comprising insulating oil and a battery pack comprising the same. Specifically, the invention relates to a battery module comprising insulating oil injected to come into direct contact with a battery cell within a sealed module housing, and a battery pack comprising the same, wherein the structure of the battery module is simplified. Background Technology

[0002] Lithium secondary batteries are used not only as energy sources for wireless mobile devices or wearable devices that are small, multifunctional products, but also as energy sources or power storage devices for electric vehicles and hybrid electric vehicles, which are presented as alternatives to conventional gasoline and diesel vehicles that cause air pollution.

[0003] The temperature of lithium secondary batteries increases during the charging and discharging process, and the phenomenon of the battery cell becoming too high causes a decrease in the battery cell's performance. Accordingly, to prevent the temperature of the battery cell from rising above a dangerous temperature, components such as a heat transfer member, heat sink, and cooling fins made of a material with high thermal conductivity are provided within the battery pack to dissipate the heat from the battery cell to the outside of the battery pack.

[0004] However, this method of indirectly cooling the battery cell has limitations in improving cooling performance.

[0005] In addition, conventional battery packs are configured to include a number of metal components, and it is pointed out that the assembly process is complex and the weight is heavy. In this regard, FIG. 1 is an exploded perspective view of a conventional battery pack.

[0006] Referring to FIG. 1, the battery pack includes a battery module (10), a cross beam (30) positioned between the battery modules (10), a pack tray (40) on which the battery modules (10) and the cross beam (30) are mounted, a lower cover (70) positioned at the bottom of the pack tray (40), a pack frame (50) positioned to surround the perimeter of the battery modules (10), a cooling member (60) for cooling the battery modules, and a pack cover (20) positioned at the top of the battery modules (10).

[0007] Conventionally, components such as a cross beam (30), a pack tray (40), a pack frame (50), a pack cover (20), and a bottom cover (70) were required to protect the battery module (10) inside the battery pack from external impact and to ensure safety.

[0008] However, the above components are heavy and have the problem of lowering the energy density of the battery pack.

[0009] Therefore, there is a need for technology that not only simplifies battery pack components to reduce weight and improve energy density, but also enhances the cooling efficiency of battery cells.

[0010] In this regard, Patent Document 1 discloses a battery module that accommodates insulating oil and a plurality of battery cells, and since the battery cells are completely submerged in insulating oil, the temperature of the battery cells can be prevented from rising rapidly. However, the battery module of Patent Document 1 includes a heat pipe for absorbing heat from the insulating oil when the temperature of the insulating oil rises, and a heat dissipation block and cooling fins for discharging the absorbed heat.

[0011] Therefore, it has not been able to present technology for realizing a battery pack with improved energy density.

[0012] As such, as lithium-ion batteries are used as high-capacity and high-output energy sources, there is a need for technology regarding battery modules that enhance safety by securing a cooling effect on the battery cells and improve energy density. Prior art literature

[0013] Korean Registered Patent Publication No. 1834846 (February 27, 2018) The problem to be solved

[0014] The present invention aims to solve the above-mentioned problems by providing a battery module with improved energy density and a battery pack including the same, which improves cooling efficiency by directly cooling the battery cell and enables the omission of battery module components by providing a high-rigidity module housing. means of solving the problem

[0015] A battery module according to the present invention for achieving such objectives comprises a battery cell stack composed of a plurality of battery cells, a module housing for accommodating one or more of the battery cell stacks arranged along the electric field direction, a High Voltage Connector (HV) for electrically connecting the battery modules, a Low Voltage Assembly (LV) for sensing the voltage and temperature of the plurality of battery cells, an insulating oil for cooling the plurality of battery cells, and a cooling port for the inflow and outflow of the insulating oil, wherein the insulating oil can flow inside the module housing and directly cool the plurality of battery cells.

[0016] The above module housing includes an upper surface, a lower surface, a first side surface, and a second side surface, and the HV connector may include a first HV connector located on the first side surface and a second HV connector located on the second side surface.

[0017] The above battery cell stack includes a first battery cell stack and a second battery cell stack, and the first electrode terminal of the first battery cell stack and the second electrode terminal of the second battery cell stack are connected to the first HV connector, and the second electrode terminal of the first battery cell stack and the first electrode terminal of the second battery cell stack can be connected to the second HV connector.

[0018] A through hole is formed in the lower portion of the lower surface of the module housing above, where the first HV connector and the second HV connector are connected to the first battery cell stack and the second battery cell stack, and the through hole can be sealed by attaching a sealing member.

[0019] The connection portion in which the above HV connector, the above LV assembly, and the above cooling port are connected to the module housing may include a sealing member to prevent leakage of the insulating oil.

[0020] The above LV assembly may include an LV connector.

[0021] The above LV assembly may further include one or more selected from the group consisting of FPC (Flexible Printed Circuit), PCB (Printed Circuit Board), and CMC (Cell Management Controller).

[0022] The present invention provides a battery pack comprising the battery module, wherein the battery pack comprises a plurality of battery modules arranged adjacently on the sides of a module housing, a Battery Disconnect Unit (BDU) arranged on one side of the plurality of battery modules, and a battery pack frame surrounding the plurality of battery modules and the BDU, wherein the plurality of battery modules are electrically connected to an adjacent battery module through an HV connector, and the BDU can be connected to the HV connector of the adjacent battery module.

[0023] The above module housing includes screw fastening portions on the first side and the second side, and a plurality of battery modules can be connected to each other by screws coupled to the screw fastening portions.

[0024] The plurality of battery modules above include an LV assembly coupled to all battery cell stacks, and the LV assembly can be connected to a BMS (Battery Management System).

[0025] The inflow and outflow paths of the insulating oil may be configured with at least one connection structure among series connection and parallel connection between the plurality of battery modules.

[0026] The plurality of battery modules mentioned above may be structured such that the upper and lower surfaces of the module housing are exposed while mounted on the battery pack frame.

[0027] The above battery pack frame may have connection openings formed at positions corresponding to the HV connectors and LV assemblies mounted on a plurality of battery modules.

[0028] The above battery pack frame may be composed of a first member, a second member, a third member, and a fourth member connected perpendicularly to each other.

[0029] The present invention can also be provided in a form that combines various means for solving the above problem. Effects of the invention

[0030] As explained above, the present invention can directly cool the battery cell by injecting insulating oil into the battery module, thereby improving cooling efficiency.

[0031] In addition, by omitting cooling elements other than insulating oil, it is possible to provide battery modules and battery packs that achieve lightweight design and high energy density.

[0032] In addition, by providing a high-rigidity module housing, reinforcing parts conventionally used during battery pack assembly are omitted, thereby reducing manufacturing costs.

[0033] In addition, the manufacturing process can be simplified because the electrical connection structure of multiple battery modules is efficiently formed. Brief explanation of the drawing

[0034] Figure 1 is an exploded perspective view of a conventional battery pack. FIG. 2 is a perspective view of a battery module according to the present invention. FIG. 3 is a planar perspective view showing the connection state between multiple battery modules through an HV connector. Figure 4 is a partial enlarged view of the HV connector of Figure 2. Fig. 5 is an exploded perspective view of a part of the battery module of Fig. 2. FIG. 6 is a perspective view of a part of the battery module of FIG. 2. Figure 7 is an enlarged view of the part where the cooling port is connected in the battery module of Figure 2. FIG. 8 is a perspective view of a plurality of battery modules according to the present invention. FIG. 9 is a front view of a module housing according to one embodiment. FIG. 10 is a front view of a module housing according to another embodiment. FIG. 11 is a perspective view of a battery pack according to the present invention. Specific details for implementing the invention

[0035] Embodiments that enable a person skilled in the art to easily practice the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a specific description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0036] In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included.

[0037] Furthermore, descriptions that specify components by limiting or adding them may be applied to all inventions unless specifically limited, and are not limited to descriptions of specific inventions.

[0038] In addition, throughout the description of the invention and claims of this application, anything indicated in the singular includes cases where it is plural unless otherwise noted.

[0039] In addition, throughout the description of the invention and the claims of the present invention, "or" includes "and" unless otherwise noted. Therefore, "comprising A or B" means all three of the above cases: including A, including B, or including A and B.

[0040] The present invention is described in detail with reference to the drawings and embodiments.

[0041] FIG. 2 is a perspective view of a battery module according to the present invention, and FIG. 3 is a planar perspective view showing the connection state between a plurality of battery modules through an HV connector.

[0042] Referring to FIGS. 2 and 3, a battery module according to the present invention comprises a battery cell stack (100) composed of a plurality of battery cells, a module housing (200) accommodating two battery cell stacks (100) arranged side by side along an electric field direction (L), an HV connector (300) for electrically connecting the battery modules, an LV assembly (400) for sensing the voltage and temperature of the plurality of battery cells, an insulating oil (600) for cooling the plurality of battery cells, and a cooling port (500) for the inflow and outflow of the insulating oil (600).

[0043] The configuration of the LV assembly (400) can be formed in various ways depending on the configuration of the battery module, and if the battery cell stack and BMS are connected to sense the voltage and temperature of the battery cell, the types of components constituting the LV assembly are not limited.

[0044] For example, an LV assembly may include a busbar connected to the electrode leads of a battery cell stack, a Flexible Printed Circuit (FPC) coupled to the busbar, a Printed Circuit Board (PCB) connected to the FPC, a Cell Management Controller (CMC) connected to the PCB, and a Low Voltage Connector (LV connector) coupled to the CMC.

[0045] The BMS can manage the battery cells to prevent overcharging and maintain a uniform voltage, and the BDU can stably supply power to the battery cells or cut off power.

[0046] The configuration of the above PCB and CMC can be referenced in FIG. 5.

[0047] Multiple battery modules constituting a battery pack are connected to each other through an LV line connected to an LV connector, and the LV line is connected to a BMS. In this way, the connection between the battery cell stack and the BMS is formed through the LV assembly, thereby enabling the sensing of the voltage and temperature of the battery cells and the control and management thereof.

[0048] In the present invention, since insulating oil (600) is injected into the module case through a cooling port (500), the insulating oil (600) can come into direct contact with the battery cell. Therefore, when insulating oil with a low temperature is injected into the module housing, the insulating oil flows inside the module housing and can directly cool multiple battery cells. Compared to the conventional method of indirectly cooling the battery cell using a heat transfer member and cooling fins, the cooling efficiency can be significantly improved.

[0049] As such, the present invention is structured to inject and discharge insulating oil into and out of the module housing through a cooling port, and must be structured to be sealed so that insulating oil does not leak through the remaining parts excluding the cooling port.

[0050] Accordingly, the parts to which the HV connector (300), LV assembly (400), and cooling port (500) are connected as components to the module housing may be joined with a sealing member added to prevent leakage of insulating oil. For example, the HV connector (300), LV assembly (400), and cooling port (500) may be joined to the module housing with an O-ring added thereto.

[0051] The module housing (200) is formed as a monoframe structure in which four rectangular sides are arranged perpendicular to each other, and includes an upper surface (231), a lower surface (232), a first side surface (233), and a second side surface (234), and the HV connector (300) includes a first HV connector (300a) located on the first side surface (233) and a second HV connector (300b) located on the second side surface (234).

[0052] The present invention may be arranged such that two battery cell stacks are positioned along the electric direction within a module housing having a long electric direction length, and the battery module of FIG. 3 includes a first battery cell stack (110) and a second battery cell stack (120).

[0053] An HV busbar is positioned in the space between the first battery cell stack (110) and the second battery cell stack (120) facing each other as the center of the electric direction of the module housing, and the first electrode terminal and the second electrode terminal of each battery cell stack are extended in the direction of the HV busbar and coupled with the HV busbar.

[0054] Specifically, the first electrode terminal (111) of the first battery cell stack (110) and the second electrode terminal (122) of the second battery cell stack (120) are connected to the first HV connector (300a), and the second electrode terminal (112) of the first battery cell stack (110) and the first electrode terminal (121) of the second battery cell stack (120) are connected to the second HV connector (300b), so that the first electrode terminal and the second electrode terminal can be connected to the HV connectors via the HV busbar.

[0055] The first electrode terminal (111, 121) is formed by combining the electrode leads of the first electrode constituting the battery cell stack to form a terminal, and the second electrode terminal (112, 122) is formed by combining the electrode leads of the second electrode constituting the battery cell stack to form a terminal. The first electrode and the second electrode are electrodes having different polarities and may be a positive electrode and a negative electrode, or a negative electrode and a positive electrode, respectively.

[0056] The present invention allows a plurality of battery modules constituting a battery pack to be arranged adjacently and electrically connected to one another. For example, when a first battery module (701) and a second battery module (702) are located adjacently, the first battery module (701) and the second battery module (702) can be electrically connected through an HV connector (300). That is, an electrical connection can be made by directly connecting the second HV connector (300b) of the first battery module (791) and the first HV connector (300a) of the second battery module.

[0057] Accordingly, the second HV connector (300b) of the first battery module (701) and the first HV connector (300a) of the second battery module (702) can be positioned adjacently so that they can be directly connected to each other.

[0058] Unlike as illustrated in FIGS. 2 and 3, if the HV connector is positioned at both ends of the module housing in the electric direction, the configuration for connecting the electrode terminals of two battery modules may become complex, which may result in an inefficient configuration.

[0059] The present invention does not include members such as the upper cover and lower cover of a battery pack on the outer side of the upper surface (231) and lower surface (232) of the module housing (200), so that the upper surface (231) and lower surface (232) of the module housing are exposed when the battery pack is assembled.

[0060] Additionally, the first HV connector (300a) and the second HV connector (300b) are positioned to penetrate the module housing (200) and mounted on the module housing (200), and the portion where the first HV connector (300a) and the second HV connector (300b) are positioned must be completely sealed. Therefore, after combining the first HV connector (300a) and the second HV connector (300b) with the first electrode terminal and the second electrode terminal, battery cell stacks cannot be accommodated in the module housing.

[0061] Accordingly, the present invention stores battery cell stacks in a module housing and inserts the first HV connector (300a) and the second HV connector (300b) from the outside of the module housing toward the inside, and then connects the first electrode terminal and the second electrode terminal at the joint portion of the first HV connector (300a) and the second HV connector (300b). To perform this operation, a through hole (210) is formed in the lower portion of the connecting portion on the lower surface (232) of the module housing (200) where the first HV connector (300a) and the second HV connector (300b) are connected to the first battery cell stack (110) and the second battery cell stack (120).

[0062] The first electrode terminal and the second electrode terminal are connected to the connecting part of the first HV connector (300a) and the connecting part of the second HV connector (300b) through the through hole (210), and after the connection is completed, a screw (221) is connected to a sealing member (220) covering the through hole (210) so that the through hole (210) can be sealed.

[0063] Figure 4 is a partial enlarged view of the HV connector of Figure 2.

[0064] Referring to FIG. 4, the first HV connector shown in (a) is a male connector, and the second HV connector shown in (b) is a female connector, so that they are connected to each other. Therefore, when multiple battery modules are arranged side by side, an electrical connection can be made by combining the first HV connector of one battery module with the second HV connector of an adjacent battery module.

[0065] FIG. 5 is an exploded perspective view of a part of the battery module of FIG. 2, and FIG. 6 is a perspective view of a part of the battery module of FIG. 2.

[0066] Referring to FIGS. 5 and 6, a PCB (240) is attached to one end of a battery cell stack housed inside a module housing (200) to measure and manage the voltage and temperature of the battery cells. Sealing plates (250) are attached to both ends of the module housing (200) in the electric direction to prevent leakage of insulating oil in conjunction with the module housing (200), and end plates (260) are attached to the outside of the sealing plates (250).

[0067] The sealing plate (250) includes a PCB coupling portion (251) connected to the PCB (240), and a CMC (252) connected to the PCB coupling portion (251) is located between the sealing plate (250) and the end plate (260).

[0068] The CMC is connected to the PCB connected to the battery cell, allowing it to measure the voltage and temperature of the battery cell, and is connected to the BMS by forming a connection with the CMC of another battery module.

[0069] A CMC cover (253) is attached to the outside of the CMC (252) to cover the CMC (252), and the CMC cover (253) protrudes to the outside of the end plate (260) through a through hole in the end plate (260).

[0070] However, depending on the design of the battery module, the LV assembly can be configured so that the CMC is omitted, and even in such cases, it can be connected to the BMS through the LV line connected to the LV connector.

[0071] The LV assembly (400) is configured to connect the battery cells constituting the battery cell stack to the BMS, and is configured such that the bus bar (130), FPC (241), PCB (240), CMC (252), and LV connector (410) connected to the battery cells are sequentially connected. The LV connector (410) includes a terminal part (411) and a terminal part cover (412) on which the terminal part (411) is mounted, and the LV connector (410) is coupled to the CMC (252) with the terminal part (411) mounted on the terminal part cover (412).

[0072] However, the configuration of the LV assembly (400) may be configured differently from that shown in FIG. 5 and FIG. 6 depending on the configuration of the battery module, and assuming that the battery cell stack and BMS are connected to sense the voltage and temperature of the battery cell, at least one of the FPC, PCB and CMC may be omitted.

[0073] The CMC cover (253) is coupled to the CMC to surround the CMC (252) and the LV connector (410), thereby sealing the LV connector (410) connection portion to the module housing. Specifically, leakage of insulating oil can be prevented by coupling the CMC with the CMC cover (253) having an O-ring added thereto.

[0074] FIG. 7 is an enlarged view of the part where the cooling port (500) is connected in the battery module of FIG. 2.

[0075] Referring to FIG. 7, the cooling port (500) can be primarily connected to the cooling port mounting portion formed on the end plate (260) and secondarily rotated 90 degrees to complete the connection. By connecting the cooling line (510) to the cooling port (500) connected in this manner, the injection and discharge of insulating oil can be performed, and in the case where multiple battery modules are connected, the injection and discharge of insulating oil for the multiple battery modules can be performed along the cooling line (510).

[0076] Alternatively, the cooling port may be formed such that a portion of the cooling port is coupled to the cooling port mounting portion of the end plate, and a cooling line is coupled to the cooling port. For example, a quick connector may be used as the cooling pod.

[0077] FIG. 8 is a perspective view of a plurality of battery modules according to the present invention.

[0078] Referring to FIG. 8, four battery modules (700) are shown arranged side by side, and four battery modules (700) are shown spaced apart, but the battery modules (700) can be connected by an HV connector (300) and arranged in close contact.

[0079] A cooling line (510) is connected to the cooling port (500), and insulating oil flows in from the same side of the four battery modules (700), passes through the interior of the battery modules in the direction of the dotted arrow, and flows to the discharge section opposite the inlet section, and the insulating oil is discharged through the discharge section.

[0080] However, since the flow of insulating oil may vary depending on the method of forming the cooling line, the inflow and outflow paths of the insulating oil may be configured with at least one connection structure among series connection and parallel connection between the plurality of battery modules.

[0081] Additionally, multiple battery modules are connected to LV connectors (400) coupled to all battery cell stacks, and one end of the LV connectors (400) is connected to the BMS.

[0082] FIG. 9 is a front view of a module housing according to one embodiment, and FIG. 10 is a front view of a module housing according to another embodiment.

[0083] Referring to FIGS. 9 and 10, the upper surface (231) and lower surface (232) of the module housing have a structure with an empty space (235) inside. Due to this structure with an empty space, the weight can be reduced. Additionally, the rigidity of the module housing can be secured by forming a partition (236) inside. Thus, a battery pack can be configured without having separate components such as a battery pack cover and a battery pack bottom cover.

[0084] Such a modular housing can be formed by an extrusion molding method, and aluminum, carbon steel, stainless steel, and alloys thereof can be used as materials.

[0085] Since the battery cell stack may repeatedly undergo volume expansion and contraction during the charging and discharging process, at least one of the first side (233) and the second side (234) includes a buffer structure (237) to absorb such volume expansion of the battery cell stack.

[0086] The module housing includes screw fastening portions on the first side (233) and the second side (234), and a plurality of battery modules can be stably fixed by being connected to each other by screws (201) coupled to the screw fastening portions.

[0087] FIG. 11 is a perspective view of a battery pack according to the present invention.

[0088] Referring to FIG. 11, the battery pack (1000) includes a plurality of battery modules (700) arranged adjacently on the sides of the module housing, a BDU (900) arranged on one side of the plurality of battery modules (700), and a battery pack frame (800) surrounding the plurality of battery modules (700) and the BDI (900). The plurality of battery modules (700) are electrically connected to adjacent battery modules (700) through HV connectors, and the BDU (900) is connected to the HV connector of the adjacent battery module (700).

[0089] A plurality of battery modules (700) are mounted on a battery pack frame (800), and the upper and lower surfaces of the module housing (700) are exposed.

[0090] The battery pack frame (800) has a connection opening (810) formed at a position corresponding to the HV connector and LV connector mounted on the plurality of battery modules (700).

[0091] The battery pack frame (800) may be composed of a first member (821), a second member (822), a third member (823), and a fourth member (824) connected perpendicularly to each other, and the first member (821), the second member (822), the third member (823), and the fourth member (824) may be made of separate members that can be separated and combined with each other.

[0092] Additionally, the first member (821), the second member (822), the third member (823), and the fourth member (824) may include a mounting portion for mounting on a device.

[0093] A person skilled in the art to which the present invention pertains would be able to perform various applications and modifications within the scope of the present invention based on the above content. Explanation of the symbols

[0094] 10, 700: Battery module 20: Pack Cover 30: Cross Beam 40: Pack Tray 50: Pack Frame 60: Cooling element 70: Bottom cover 100: Battery cell stack 110: First battery cell stack 111, 121: First electrode terminal 112, 122: Second electrode terminal 120: Second battery cell stack 130: Busbar 200: Modular Housing 201, 221: Screw 210: Penetrating hole 220: Sealing member 231: Top surface 232: If 233: First Aspect 234: Second side 235: Empty space 236: Bulkhead 240: PCB 241: FPC 250: Sealing plate 251: PCB connection part 252: CMC 253: CMC Cover 260: End plate 300: HV connector 300a: 1st HV connector 300b: 2nd HV connector 400: LV Assembly 410: LV connector 411: Terminal section 412: Terminal cover 500: Cooling port 510: Cooling line 600: Insulating oil 701: First battery module 702: Second battery module 800: Battery pack frame 810: Connection opening 821: First part 822: Second absence 823: Third Absence 824: Fourth Part 900: BDU 1000: Battery pack

Claims

Claim 1 A battery cell stack composed of a plurality of battery cells; a module housing accommodating one or more of the battery cell stacks arranged along the electric field direction; a High Voltage Connector (HV Connector) for electrically connecting the battery modules; a Low Voltage Assembly (LV Assembly) for sensing the voltage and temperature of the plurality of battery cells; and insulating oil for cooling the plurality of battery cells. A battery module comprising: a cooling port for the entry and exit of the insulating oil; wherein the insulating oil flows inside the module housing and directly cools the plurality of battery cells; wherein the module housing is a monoframe structure in which four surfaces, including a rectangular top surface, a bottom surface, a first side surface, and a second side surface, are arranged perpendicular to each other; wherein the HV connector includes a first HV connector located on the first side surface and a second HV connector located on the second side surface; wherein the battery cell stack includes a first battery cell stack and a second battery cell stack arranged along the electric field direction within a module housing having a long electric field length, wherein the first electrode terminal of the first battery cell stack and the second electrode terminal of the second battery cell stack are connected to the first HV connector, and the second electrode terminal of the first battery cell stack and the first electrode terminal of the second battery cell stack are connected to the second HV connector. Claim 2 delete Claim 3 delete Claim 4 A battery module according to claim 1, wherein a through hole is formed in the lower portion of the lower surface of the module housing where the first HV connector and the second HV connector are connected to the first battery cell stack and the second battery cell stack, and the through hole is sealed by attaching a sealing member. Claim 5 A battery module according to claim 1, wherein the connection portion connecting the HV connector, the LV assembly, and the cooling port to the module housing includes a sealing member for preventing leakage of the insulating oil. Claim 6 In claim 1, the LV assembly is a battery module including an LV connector. Claim 7 In claim 6, the above LV assembly is a battery module further comprising one or more selected from the group consisting of FPC (Flexible Printed Circuit), PCB (Printed Circuit Board), and CMC (Cell Management Controller). Claim 8 A battery pack comprising a battery module according to any one of claims 1 and 4 to 7, wherein the sides of the module housings are arranged adjacently for a plurality of battery modules; a Battery Disconnect Unit (BDU) disposed on one side of the plurality of battery modules; and a battery pack frame surrounding the plurality of battery modules and the BDU; wherein the plurality of battery modules are electrically connected to an adjacent battery module through an HV connector, and the BDU is connected to the HV connector of the adjacent battery module. Claim 9 In claim 8, the module housing includes screw fastening portions on the first side and the second side, and a plurality of battery modules are connected to each other by screws coupled to the screw fastening portions, forming a battery pack. Claim 10 In claim 8, the plurality of battery modules include an LV assembly coupled to all battery cell stacks, and the LV assembly is a battery pack connected to a BMS (Battery Management System). Claim 11 A battery pack according to claim 8, wherein the inflow and outflow paths of insulating oil are configured in at least one of a series connection and a parallel connection among the plurality of battery modules. Claim 12 In claim 8, the battery pack is structured such that the upper and lower surfaces of the module housing are exposed while the plurality of battery modules are mounted on the battery pack frame. Claim 13 In claim 10, the battery pack frame is a battery pack having connection openings formed at positions corresponding to HV connectors and LV assemblies mounted on a plurality of battery modules. Claim 14 In claim 8, the battery pack frame comprises a first member, a second member, a third member, and a fourth member connected perpendicularly to each other.

Images