Battery device

Abstract

The technical concept of the present invention provides a battery device comprising a cooling frame and a cell assembly disposed on the cooling frame, wherein the cell assembly comprises a heat transfer structure including a plurality of battery cells, a first heat transfer plate connected to the electrode leads of the plurality of battery cells, and a second heat transfer plate connected to the cooling frame, and an outer cover connected to the first heat transfer plate, wherein at the interface between the first heat transfer plate and the outer cover, the outer cover is in continuous contact with the outer surface of the first heat transfer plate.

Description

Technical Field

[0001] The present invention relates to a battery device.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0088180 filed on July 4, 2024, and all contents disclosed in the documents of said Korean Patent Application are included as part of the present specification.

Background Art

[0003] Unlike primary batteries, secondary batteries are capable of multiple charge and discharge cycles. Secondary batteries are widely used as an energy source for various cordless devices such as handsets, notebook computers, and cordless vacuum cleaners. In recent years, with improvements in energy density and economies of scale, the manufacturing cost per unit capacity of secondary batteries has been dramatically reduced, and as the cruising range of BEVs (battery electric vehicles) increases to a level comparable to that of fuel vehicles, the main application of secondary batteries is shifting from mobile devices to mobility.

[0004] Secondary batteries are used in mobility, and the requirements for the safety of secondary batteries are increasing. When an accident such as a fire occurs in a secondary battery used in mobility, it may endanger the life of the driver, so research on technology for improving the safety of secondary batteries is essential.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technical problem to be achieved by the present invention is to provide a battery device.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, the technical concept of the present invention provides a battery device comprising a cooling frame and a cell assembly disposed on the cooling frame, wherein the cell assembly comprises a heat transfer structure including a plurality of battery cells, a first heat transfer plate connected to the electrode leads of the plurality of battery cells, and a second heat transfer plate connected to the cooling frame, and an outer cover connected to the first heat transfer plate, wherein at the interface between the first heat transfer plate and the outer cover, the outer cover is in continuous contact with the outer surface of the first heat transfer plate.

[0007] In an exemplary embodiment, the outer surface of the first heat transfer plate is flat, and the contact surface of the outer cover that contacts the outer surface of the first heat transfer plate is flat.

[0008] In an exemplary embodiment, the outer surface of the first heat transfer plate has a first edge and a second edge opposite to each other, and the contact between the first heat transfer plate and the outer cover is continuous between the first edge and the second edge of the outer surface of the first heat transfer plate.

[0009] In an exemplary embodiment, the first heat transfer plate includes a plurality of through holes, and the outer cover includes a plurality of protrusions that are inserted into the plurality of through holes of the first heat transfer plate.

[0010] In an exemplary embodiment, the sides of the plurality of protrusions on the outer cover are coplanar with the inner surface of the first heat transfer plate opposite to the outer surface of the first heat transfer plate.

[0011] In an exemplary embodiment, the system further includes an inner cover supporting the electrode leads of the plurality of battery cells, wherein the first heat transfer plate is positioned between the inner cover and the outer cover, and the outer cover is coupled to the inner cover.

[0012] In exemplary embodiments, the invention further includes busbars mounted on the inner cover and coupled to the electrode leads of the plurality of battery cells.

[0013] In an exemplary embodiment, the heat transfer structure includes metal, and the outer cover includes plastic.

[0014] In an exemplary embodiment, the invention further includes a thermally conductive adhesive layer for attaching the electrode leads of the plurality of battery cells to the first heat transfer plate.

[0015] In an exemplary embodiment, the invention further includes a thermally conductive adhesive layer for attaching the plurality of battery cells to the cooling frame.

[0016] In an exemplary embodiment, the cooling frame is characterized by including cooling channels through which a cooling fluid flows.

[0017] In an exemplary embodiment, the heat transfer structure and the outer cover are formed integrally by an insert injection molding method.

[0018] In an exemplary embodiment, the cooling frame is further characterized by comprising a side frame coupled around the cooling frame and enclosing the cell assembly, and a top frame coupled to the side frame so as to cover the cell assembly. [Effects of the Invention]

[0019] According to an exemplary embodiment, the heat transfer structure and the outer cover are integrally formed by insert injection molding, so the outer cover can have the same rigidity as the heat transfer structure. This suppresses physical deformation of the outer cover, such as bending.

[0020] According to an exemplary embodiment, the rigidity of the outer cover can be reinforced by the heat transfer structure, so that a separate rib structure for reinforcing the rigidity of the outer cover can be eliminated, and by eliminating the separate rib structure, the space utilization of the cell assembly and the battery device can be improved.

[0021] According to an exemplary embodiment, since the heat transfer structure and the outer cover are integrally formed by insert injection molding, the outer cover can be coupled to the heat transfer structure without an adhesive medium such as an adhesive. Thereby, the manufacturing difficulty of the outer cover can be reduced, and the problem of poor coupling between the outer cover and the heat transfer structure can be prevented.

[0022] According to an exemplary embodiment, the electrode leads of the battery cell can be thermally coupled to the cooling frame via the heat transfer structure, so that heat generation of the electrode leads of the battery cell can be effectively controlled, and the cooling efficiency of the battery cell can be improved.

[0023] The effects obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those having ordinary skill in the art to which the exemplary embodiments of the present disclosure pertain from the following description. That is, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived by those having ordinary skill in the art from the exemplary embodiments of the present disclosure. [Brief Description of the Drawings]

[0024] [Figure 1] It is a plan view showing a battery device according to an exemplary embodiment. [Figure 2] It is a cross-sectional view showing a part of a battery device according to an exemplary embodiment. [Figure 3] It is a perspective view showing a heat transfer structure and an outer cover provided in a cell assembly according to an exemplary embodiment. [Figure 4] It is an exploded perspective view showing a heat transfer structure and an outer cover provided in a cell assembly according to an exemplary embodiment. [Figure 5] It is a cross-sectional view taken along the line V-V' in Figure 3. [Figure 6] It is a schematic view showing a part of an electric vehicle equipped with a battery pack according to an exemplary embodiment.

Description of Embodiments for Carrying Out the Invention

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. As a premise, the terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings, and may be construed as meanings and concepts consistent with the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the terms in order to describe his own invention in the best way.

[0026] Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention, and do not represent all the technical ideas of the present invention, so that various equivalents and modifications that can substitute for them may exist at the time of the present application.

[0027] Further, in the description of the present invention, when it is determined that a specific description related to a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0028] The embodiments of the present invention are provided to more fully explain the present invention to those of ordinary skill in the art, so the shapes, sizes and the like of the constituent elements in the drawings may be exaggerated, omitted, or schematically illustrated for clearer description. Therefore, the size and ratio of each constituent element do not completely reflect the actual size and ratio.

[0029] (First Embodiment) Figure 1 is a plan view showing a battery device 10 according to an exemplary embodiment. Figure 2 is a cross-sectional view showing a portion of the battery device 10 according to an exemplary embodiment. Figure 3 is a perspective view showing a heat transfer structure 130 and an outer cover 140 provided to a cell assembly 100 according to an exemplary embodiment. Figure 4 is a separated perspective view showing a heat transfer structure 130 and an outer cover 140 provided to a cell assembly 100 according to an exemplary embodiment. Figure 5 is a cross-sectional view along the line V-V' in Figure 3.

[0030] Referring to Figures 1 to 5, the battery device 10 may include a housing 500 and a cell assembly 100.

[0031] The housing 500 may provide an internal space for housing cell assemblies 100. One or more cell assemblies 100 may be housed in the internal space of the housing 500. The housing 500 may include a base frame 510, side frames 520, and a top frame 530.

[0032] The base frame 510 can support the cell assemblies 100. The base frame 510 may have a flat plate shape extending substantially in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction). Multiple cell assemblies 100 may be provided on the base frame 510, arranged in the first horizontal direction (e.g., the X direction) and the second horizontal direction (e.g., the Y direction).

[0033] The base frame 510 may include cooling channels 511 configured for the flow of a cooling fluid. The cooling fluid, supplied from outside the base frame 510, may be supplied to the inlet of the cooling channels 511, flow along the cooling channels 511, and be discharged to the outside through the outlet of the cooling channels 511. Cooling of the cell assembly 100 may occur while the cooling fluid flows along the cooling channels 511. The cooling channels may extend in a first horizontal direction (e.g., the X direction) within the base frame. The cooling fluid may include coolant and / or refrigerant. The base frame 510 may be referred to as a cooling frame.

[0034] The side frame 520 may be coupled around the base frame 510. The side frame 520 may extend along the perimeter of the base frame 510 and surround the cell assembly 100.

[0035] The top frame 530 may be fastened onto the side frames 520 so as to cover a plurality of cell assemblies 100. The top frame 530 may have a flat plate shape extending in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction). The top frame 530 may be separated from the cell assemblies 100 in a vertical direction (e.g., the Z direction).

[0036] The cell assembly 100 may be mounted on a base frame 510. The cell assembly 100 may include a plurality of battery cells 110, an inner cover 120, a heat transfer structure 130, and an outer cover 140. In exemplary embodiments, the cell assembly 100 may correspond to a cell-to-pack structure or a battery module.

[0037] Each battery cell 110 is the basic unit of a lithium-ion battery, i.e., a secondary battery. Each battery cell 110 may include an electrode assembly, an electrolyte, and a cell case. The electrode assembly housed in the cell case may include a positive electrode, a negative electrode, and a separator membrane interposed between the positive and negative electrodes. Depending on the form of assembly, the electrode assembly may be either a jelly roll type or a stack type. A jelly roll type electrode assembly may include a winding structure of a positive electrode, a negative electrode, and a separator membrane interposed between them. A stack type electrode assembly may include a plurality of sequentially stacked positive electrodes, a plurality of negative electrodes, and a plurality of separator membranes interposed between them. The positive electrode may include a positive electrode current collector and a positive electrode active material. The negative electrode may include a negative electrode current collector and a negative electrode active material.

[0038] Each battery cell 110 may be a pouch-type battery cell, a cylindrical battery cell, or a prismatic battery cell. The electrode assembly of a pouch-type battery cell is housed in a pouch case containing an aluminum laminate sheet. The electrode assembly of a cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of a prismatic battery cell is housed in a prismatic metal can.

[0039] Multiple battery cells 110 provided to the cell assembly 100 can be connected in series and / or in parallel. For example, multiple battery cells 110 can be connected in series with each other. For example, multiple battery cells 110 can be connected in parallel with each other. For example, when a set of two or more battery cells 110 connected in parallel with each other is defined as a bank, one bank consisting of two or more battery cells 110 connected in parallel with each other and another bank consisting of two or more battery cells 110 connected in parallel with each other can be connected in series.

[0040] In exemplary embodiments, a plurality of battery cells 110 provided to a cell assembly 100 may be arranged in a first horizontal direction (e.g., the X direction), and individual battery cells 110 may extend in a second horizontal direction (e.g., the Y direction). Electrode leads 111 may be provided at least one of the ends of an individual battery cell 110 along the second horizontal direction (e.g., the Y direction). Among the plurality of battery cells 110, the electrode leads 111 of adjacent battery cells 110 may be electrically and physically connected to one another.

[0041] A thermally conductive adhesive layer 211 may be placed between the cell assembly 100 and the base frame 510. The thermally conductive adhesive layer 211 can adhere multiple battery cells 110 to the base frame 510. The upper part of the thermally conductive adhesive layer 211 may be in direct contact with each of the multiple battery cells 110, and the lower part of the thermally conductive adhesive layer 211 may be in direct contact with the base frame 510. The thermally conductive adhesive layer 211 can thermally bond each of the multiple battery cells 110 to the base frame 510. The thermally conductive adhesive layer 211 may include a thermal resin and / or a thermal interface material.

[0042] The inner cover 120 may be positioned on the side of the cell assembly 100 along a second horizontal direction (e.g., the Y direction). The inner cover 120 may be connected to the side of each battery cell 110 along a second horizontal direction (e.g., the Y direction). The inner cover 120 may include insulating material. The inner cover 120 may support the electrode leads 111 of the plurality of battery cells 110 and the plurality of busbars 121. The inner cover 120 may include slits into which the electrode leads 111 of the plurality of battery cells 110 are inserted. The plurality of busbars 121 may be mounted on the inner cover 120, and each of the busbars 121 may be electrically and physically connected to at least one of the electrode leads 111 of the plurality of battery cells 110. For example, each of the busbars 121 may be connected to at least one of the electrode leads 111 of the plurality of battery cells 110 by welding. Multiple busbars 121 may include interbusbars for electrically connecting battery cells 110 belonging to the same cell assembly 100, and terminal busbars for electrically connecting battery cells 110 belonging to different cell assemblies 100.

[0043] The heat transfer structure 130 can thermally connect at least one of the electrode leads 111 of the plurality of battery cells 110 to the base frame 510. The heat transfer structure 130 can provide a heat conduction path for transferring heat generated from the plurality of battery cells 110 to the base frame 510. The heat transfer structure 130 may contain a material with excellent thermal conductivity, such as a metal. For example, the heat transfer structure 130 may contain copper, aluminum, silver, gold, platinum, tungsten, iron, or a combination thereof.

[0044] The heat transfer structure 130 may include a first heat transfer plate 131 connected to at least one of the electrode leads 111 of a plurality of battery cells 110, and a second heat transfer plate 132 connected to the base frame 510.

[0045] The first heat transfer plate 131 is located between the inner cover 120 and the outer cover 140, and may have a flat plate shape that generally extends in a first horizontal direction (e.g., the X direction) and a vertical direction (e.g., the Z direction). The first heat transfer plate 131 may include an inner surface 1313 and an outer surface 1311 opposite each other in a second horizontal direction (e.g., the Y direction), and the inner surface 1313 and outer surface 1311 of the first heat transfer plate 131 may each be planar.

[0046] The first heat transfer plate 131 can be thermally and physically attached to the electrode leads 111 of a plurality of battery cells 110 and a plurality of busbars 121 by a thermally conductive adhesive layer 151. The thermally conductive adhesive layer 151 may be interposed between each of the electrode leads 111 of the plurality of battery cells 110 and the inner surface 1313 of the first heat transfer plate 131. The thermally conductive adhesive layer 151 may be thermally conductive and electrically insulated. For example, the thermally conductive adhesive layer 151 may include a thermal resin and / or a thermal interface material.

[0047] The second heat transfer plate 132 may be connected to the lower end of the first heat transfer plate 131, and the second heat transfer plate 132 may extend along the upper surface of the base frame 510. The second heat transfer plate 132 may generally have a flat plate shape extending in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction). The second heat transfer plate 132 may include opposite upper and lower surfaces in the vertical direction (e.g., the Z direction), and the upper and lower surfaces of the second heat transfer plate 132 may each be planar. When viewed in cross-section, the extending direction of the second heat transfer plate 132 and the extending direction of the first heat transfer plate 131 of the heat transfer structure 130 may intersect or be perpendicular to each other, and the heat transfer structure 130 may have a bent shape.

[0048] The second heat transfer plate 132 can be thermally and physically attached to the base frame 510 by a thermally conductive adhesive layer 213. The thermally conductive adhesive layer 213 may be interposed between the bottom surface of the second heat transfer plate 132 and the base frame 510. The thermally conductive adhesive layer 213 may be thermally conductive and electrically insulated. For example, the thermally conductive adhesive layer 213 may include a thermal resin and / or a thermal interface material.

[0049] When the electrode leads 111 and / or busbars 121 of the battery cell 110 are heated to a high temperature, if the temperature of the electrode leads 111 and / or busbars 121 of the battery cell 110 is not reduced, heat is transferred to the center of the battery cell 110, leading to a problem of increased heat generation in the battery cell 110. According to an exemplary embodiment of the present invention, the electrode leads 111 and busbars 121 of the battery cell 110 are thermally coupled to a base frame 510 having a cooling function via a heat transfer structure 130, thereby improving the cooling efficiency of the battery cell 110 and effectively controlling the heat generation of the battery cell 110.

[0050] The outer cover 140 may be positioned on the side of the cell assembly 100 along the second horizontal direction (e.g., the Y direction). The outer cover 140 may cover the side of the inner cover 120 and the side of the heat transfer structure 130. The outer cover 140 may contain an insulating material. The outer cover 140 may be connected to the heat transfer structure 130 and coupled to the inner cover 120. When the outer cover 140 is coupled to the inner cover 120, the first heat transfer plate 131 may be positioned between the outer cover 140 and the inner cover 120. The outer cover 140 may contain an insulating material. For example, the outer cover 140 may be made of plastic. The outer cover 140 may be coupled to the heat transfer structure 130 without an adhesive medium such as an adhesive.

[0051] In exemplary embodiments, the outer cover 140 and the heat transfer structure 130 may be integrally formed by insert injection. Insert injection may include the steps of placing the heat transfer structure 130 into an injection mold, placing liquid plastic material into the injection mold, and curing the plastic material. During the curing process, the outer cover 140 formed by the curing of the plastic material may be bonded to the heat transfer structure 130 as an integral part. The bond between the outer cover 140 and the heat transfer structure 130 may be achieved without an adhesive medium such as an adhesive and / or fastening structures such as fixing pins. The outer cover 140 and the heat transfer structure 130 are integrally formed by insert injection and can be treated as a single part.

[0052] The outer cover 140 may be coupled to the first heat transfer plate 131. The outer cover 140 may be coupled to the outer surface 1311 of the first heat transfer plate 131 such that no gap is formed between the outer cover 140 and the outer surface 1311 of the first heat transfer plate 131. At the contact interface between the outer cover 140 and the first heat transfer plate 131, the outer cover 140 may be in continuous contact with the outer surface 1311 of the first heat transfer plate 131. At the contact interface between the outer cover 140 and the first heat transfer plate 131, the contact between the first heat transfer plate 131 and the outer cover 140 may be continuous between the first and second edges of the first heat transfer plate 131 opposite in the first horizontal direction (e.g., the X direction). Also, at the contact interface between the outer cover 140 and the first heat transfer plate 131, the contact between the first heat transfer plate 131 and the outer cover 140 may be continuous in the vertical direction (e.g., the Z direction). The contact surface 143 of the outer cover 140 that is in contact with the outer surface 1311 of the first heat transfer plate 131 may be a plane parallel to the outer surface 1311 of the first heat transfer plate 131.

[0053] The first heat transfer plate 131 may include a plurality of through holes 133. The plurality of through holes 133 of the first heat transfer plate 131 may be spaced apart from each other in a first horizontal direction (e.g., the X direction) and a vertical direction (e.g., the Z direction). The outer cover 140 may include a plurality of projections 141 inserted into the plurality of through holes 133 of the first heat transfer plate 131. The plurality of through holes 133 in the first heat transfer plate 131 may each extend from the outer surface 1311 to the inner surface 1313 of the first heat transfer plate 131. The plurality of projections 141 of the outer cover 140 may each be inserted into the corresponding through hole 133 of the plurality of through holes 133 of the first heat transfer plate 131. The multiple protrusions 141 of the outer cover 140 may each extend from the outer surface 1311 to the inner surface 1313 of the outer cover 140 through the corresponding through-holes 133 of the first heat transfer plate 131. The sides of the multiple protrusions 141 of the outer cover 140 may be coplanar with the inner surface 1313 of the outer cover 140. For example, when the outer cover 140 and the heat transfer structure 130 are formed by insert injection molding, the plastic material filling the multiple through-holes 133 of the first heat transfer plate 131 may become the multiple protrusions 141 of the outer cover 140. The insertion of the multiple protrusions 141 of the outer cover 140 into the multiple through-holes 133 of the first heat transfer plate 131 may further strengthen the bond between the outer cover 140 and the heat transfer structure 130.

[0054] In an exemplary embodiment, in the first heat transfer plate 131, a first region of the first heat transfer plate 131 that is in contact with the electrode leads 111 and busbars 121 of the battery cell 110 may be separated from a first region of the first heat transfer plate 131 that is provided with a plurality of through holes 133. The electrode leads 111 and busbars 121 of the battery cell 110 may be in contact with the portion of the first heat transfer plate 131 that is involved in heat conduction, but may not be in contact with the insulating outer cover 140 that is not involved in heat conduction.

[0055] The outer cover 140 can be fastened to the inner cover 120. By coupling the outer cover 140 to the inner cover 120, a heat transfer structure 130, which is integrated with the outer cover 140, can be fixed. The outer cover 140 may include a first fastening projection 148 at its lower end that is coupled to the inner cover 120, and may include second fastening projections 149 on both sides that are coupled to the inner cover 120. The heat transfer structure 130 may include an opening 134 through which the first fastening projection 148 of the outer cover 140 passes, and the first fastening projection 148 of the outer cover 140 can be fitted and coupled to a fastening portion of the inner cover 120 provided at the lower part of the inner cover 120. The second fastening projection 149 of the outer cover 140 can be fitted and coupled to a fastening portion of the inner cover 120 provided on the side of the inner cover 120.

[0056] In some exemplary embodiments, the heat transfer structure 130 may have fastening structures that fasten to the inner cover 120. In this case, the fastening structures for directly fastening the outer cover 140 to the inner cover 120 (i.e., the first fastening projection 148 and the second fastening projection 149) may be omitted, and the outer cover 140 can be fixed by the heat transfer structure 130 being fastened to the inner cover 120.

[0057] The cell assembly 100 may include a pair of fastening frames 170. The pair of fastening frames 170 may be spaced apart in a first horizontal direction (e.g., the X direction) with a plurality of battery cells 110 in between. One of the pair of fastening frames 170 may be attached to the outermost battery cell 110 of the plurality of battery cells 110, and the other of the pair of fastening frames 170 may be attached to the other outermost battery cell 110 of the plurality of battery cells 110. Each of the pair of fastening frames 170 may be fastened by fastening bolts BT to a support structure of a housing 500 provided on a base frame 510. Each of the pair of fastening frames 170 may be fastened to the housing 500 and support the battery cells 110 in a first horizontal direction (e.g., the X direction). The pair of fastening frames 170 can support the battery cells 110 in a first horizontal direction (e.g., the X direction) to suppress swelling of the battery cells 110.

[0058] According to an exemplary embodiment, the heat transfer structure 130 and the outer cover 140 are integrally formed by insert injection molding, so the outer cover 140 can have the same rigidity as the heat transfer structure 130. This suppresses physical deformation of the outer cover 140, such as bending.

[0059] In the comparative example battery device, the outer cover has a rib structure to reinforce rigidity in the portion that contacts the heat transfer structure. According to the exemplary embodiment, the rigidity of the outer cover 140 can be reinforced by the heat transfer structure 130, so a separate rib structure to reinforce the rigidity of the outer cover 140 can be eliminated, and by eliminating the separate rib structure, the space utilization of the cell assembly 100 and the battery device 10 can be improved.

[0060] According to an exemplary embodiment, the heat transfer structure 130 and the outer cover 140 are integrally formed by insert injection molding, so that the outer cover 140 can be bonded to the heat transfer structure 130 without an adhesive medium such as an adhesive or a fastening structure such as a fixing pin. This reduces the difficulty of manufacturing the outer cover 140 and prevents problems with poor bonding between the outer cover 140 and the heat transfer structure 130.

[0061] According to an exemplary embodiment, the electrode leads 111 of the battery cell 110 can be thermally coupled to the cooling frame via the heat transfer structure 130, thereby effectively controlling the heat generated by the electrode leads 111 of the battery cell 110 and improving the cooling efficiency of the battery cell 110.

[0062] (Second Embodiment) Figure 6 is a schematic diagram showing a portion of an electric vehicle 1000 equipped with a battery pack 1100 according to an exemplary embodiment.

[0063] In Figure 6, the electric vehicle 1000 may include a vehicle frame 1200 forming the lower frame of the vehicle, a battery pack 1100 mounted on the vehicle frame 1200, and running wheels. The battery pack 1100 may include the battery device 10 described with reference to Figures 1 to 5. According to the exemplary embodiment, the heat generation of the electrode leads 111 of the battery cell 110 can be effectively controlled, and the cooling efficiency of the battery cell 110 can be improved, thereby improving the safety and reliability of the battery pack and the electric vehicle including it.

[0064] The present invention has been described in more detail above with reference to the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be a variety of equivalents and modifications that can be substituted for them at the time of filing.

Claims

1. Cooling frame and A cell assembly placed on a cooling frame, Includes, The aforementioned cell assembly is Multiple battery cells, A heat transfer structure including a first heat transfer plate connected to the electrode leads of the plurality of battery cells and a second heat transfer plate connected to the cooling frame, An outer cover connected to the first heat transfer plate, Includes, A battery device in which, at the interface between the first heat transfer plate and the outer cover, the outer cover is in continuous contact with the outer surface of the first heat transfer plate.

2. The outer surface of the first heat transfer plate is flat, The battery device according to claim 1, wherein the contact surface of the outer cover that contacts the outer surface of the first heat transfer plate is flat.

3. The outer surface of the first heat transfer plate has a first edge and a second edge opposite to each other. The battery device according to claim 1, wherein the contact between the first heat transfer plate and the outer cover is continuous between the first edge and the second edge of the outer surface of the first heat transfer plate.

4. The first heat transfer plate includes a plurality of through holes, The battery device according to claim 1, wherein the outer cover includes a plurality of protrusions that are inserted into the plurality of through holes of the first heat transfer plate.

5. The battery device according to claim 4, wherein the sides of the plurality of protrusions of the outer cover are coplanar with the inner surface of the first heat transfer plate opposite to the outer surface of the first heat transfer plate.

6. The invention further includes an inner cover that supports the electrode leads of the plurality of battery cells, The first heat transfer plate is positioned between the inner cover and the outer cover. The battery device according to claim 1, wherein the outer cover is coupled to the inner cover.

7. The battery device according to claim 6, further comprising a busbar mounted on the inner cover and coupled to the electrode leads of the plurality of battery cells.

8. The heat transfer structure includes metal, The battery device according to claim 1, wherein the outer cover includes plastic.

9. The battery device according to claim 1, further comprising a thermally conductive adhesive layer for attaching the electrode leads of the plurality of battery cells to the first heat transfer plate.

10. The battery device according to claim 1, further comprising a thermally conductive adhesive layer for attaching the plurality of battery cells to the cooling frame.

11. The battery device according to claim 1, wherein the cooling frame includes a cooling channel through which a cooling fluid flows.

12. The battery device according to claim 1, wherein the heat transfer structure and the outer cover are integrally formed by an insert injection molding method.

13. A side frame is coupled around the cooling frame and surrounds the cell assembly, A top frame is connected to the side frame so as to cover the cell assembly, The battery device according to claim 1, further comprising:

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