Battery device

Abstract

The technical concept of the present invention is to provide a battery device comprising a cooling frame and a cell assembly disposed on the cooling frame, the cell assembly comprising: a plurality of battery cells; a heat transfer structure comprising a first heat transfer plate connected to 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

Battery device

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

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0088180, filed July 4, 2024, and all contents of the document in that Republic of Korea Patent Application are incorporated herein by reference.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] As secondary batteries become increasingly used in mobility, demand for their safety is increasing. Fires and other accidents involving secondary batteries used in mobility vehicles can endanger the lives of drivers, making research into technologies that enhance secondary battery safety essential.

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

[0006] In order to solve the above-described problem, the technical idea of ​​the present invention provides a battery device including a cooling frame; and a cell assembly disposed on the cooling frame, wherein the cell assembly includes a plurality of battery cells; a heat transfer structure including a first heat transfer plate connected to 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 an interface between the first heat transfer plate and the outer cover, the outer cover is in continuous contact with an outer surface of the first heat transfer plate.

[0007] In exemplary embodiments, the outer surface of the first heat transfer plate is flat, and the contact surface of the outer cover in contact with the outer surface of the first heat transfer plate is flat.

[0008] In exemplary embodiments, the outer surface of the first heat transfer plate has first and second edges that are opposed to each other, and the contact between the first heat transfer plate and the outer cover is characterized in that it is continuous between the first edge and the second edge of the outer surface of the first heat transfer plate.

[0009] In exemplary embodiments, the first heat transfer plate includes a plurality of through holes, and the outer cover is characterized in that it includes a plurality of protrusions inserted into the plurality of through holes of the first heat transfer plate.

[0010] In exemplary embodiments, the side surfaces of the plurality of protrusions of the outer cover are characterized in that they are flush with the inner surface of the first heat transfer plate opposite the outer surface of the first heat transfer plate.

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

[0012] In exemplary embodiments, the device further comprises a busbar mounted on the inner cover and coupled to the electrode leads of the plurality of battery cells.

[0013] In exemplary embodiments, the heat transfer structure comprises metal and the outer cover comprises plastic.

[0014] In exemplary embodiments, the device further comprises a thermally conductive adhesive layer that attaches the electrode leads of the plurality of battery cells to the first heat transfer plate.

[0015] In exemplary embodiments, the device further comprises a thermally conductive adhesive layer that attaches the plurality of battery cells to the cooling frame.

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

[0017] In exemplary embodiments, the heat transfer structure and the outer cover are characterized in that they are integrally formed by insert injection molding.

[0018] In exemplary embodiments, the cooling frame further comprises a side frame coupled to the periphery of the cooling frame and surrounding the cell assembly; and a top frame coupled to the side frame so as to cover the cell assembly.

[0019] According to exemplary embodiments, since the heat transfer structure and the outer cover are integrally formed through insert injection, the outer cover can have a rigidity similar to that of the heat transfer structure. Accordingly, physical deformation of the outer cover, such as warping, can be suppressed.

[0020] According to exemplary embodiments, 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 the space utilization of the cell assembly and battery device can be improved as the separate rib structure is eliminated.

[0021] According to exemplary embodiments, the heat transfer structure and the outer cover are integrally formed through insert injection molding, so that the outer cover can be joined to the heat transfer structure without an adhesive, such as an adhesive. This reduces the manufacturing difficulty of the outer cover and prevents issues with poor bonding between the outer cover and the heat transfer structure.

[0022] According to exemplary embodiments, the electrode leads of the battery cells can be thermally coupled to the cooling frame through a heat transfer structure, thereby effectively controlling the heat generation of the electrode leads of the battery cells and improving the cooling efficiency for the battery cells.

[0023] The effects that can be 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 skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0024] FIG. 1 is a plan view illustrating a battery device according to exemplary embodiments.

[0025] FIG. 2 is a cross-sectional view illustrating a portion of a battery device according to exemplary embodiments.

[0026] FIG. 3 is a perspective view showing a heat transfer structure and an outer cover provided in a cell assembly according to exemplary embodiments.

[0027] FIG. 4 is an exploded perspective view showing a heat transfer structure and an outer cover provided in a cell assembly according to exemplary embodiments.

[0028] Figure 5 is a cross-sectional view taken along line V-V' of Figure 3.

[0029] FIG. 6 is a schematic diagram showing a portion of an electric vehicle equipped with a battery pack according to exemplary embodiments.

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0031] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0032] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0033] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0034]

[0035] (Example 1)

[0036] FIG. 1 is a plan view illustrating a battery device (10) according to exemplary embodiments. FIG. 2 is a cross-sectional view illustrating a portion of a battery device (10) according to exemplary embodiments. FIG. 3 is a perspective view illustrating a heat transfer structure (130) and an outer cover (140) provided in a cell assembly (100) according to exemplary embodiments. FIG. 4 is an exploded perspective view illustrating a heat transfer structure (130) and an outer cover (140) provided in a cell assembly (100) according to exemplary embodiments. FIG. 5 is a cross-sectional view taken along line V-V' of FIG. 3.

[0037] Referring to FIGS. 1 to 5, the battery device (10) may include a housing (500) and a cell assembly (100).

[0038] The housing (500) may provide an internal space for accommodating a cell assembly (100). One or more cell assemblies (100) may be accommodated in the internal space of the housing (500). The housing (500) may include a base frame (510), a side frame (520), and a top frame (530).

[0039] A base frame (510) can support a cell assembly (100). The base frame (510) can have a flat plate shape extending in a first horizontal direction (e.g., X direction) and a second horizontal direction (e.g., Y direction). On the base frame (510), a plurality of cell assemblies (100) arranged in a first horizontal direction (e.g., X direction) and a second horizontal direction (e.g., Y direction) can be provided.

[0040] The base frame (510) may include a cooling channel (511) configured to allow a cooling fluid to flow. A cooling fluid provided from the outside of the base frame (510) may be supplied to an inlet of the cooling channel (511), flow along the cooling channel (511), and discharged to the outside through an outlet of the cooling channel (511). While the cooling fluid flows along the cooling channel (511), cooling of the cell assembly (100) may be performed. The cooling channel may extend in a first horizontal direction (e.g., an X-direction) within the base frame. The cooling fluid may include a coolant and / or a refrigerant. The base frame (510) may be referred to as a cooling frame.

[0041] The side frame (520) can be coupled to the perimeter of the base frame (510). The side frame (520) can extend along the perimeter of the base frame (510) and surround the cell assembly (100).

[0042] A top frame (530) may be fastened to the side frames (520) 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., X direction) and a second horizontal direction (e.g., Y direction). The top frame (530) may be spaced apart from the cell assemblies (100) in a vertical direction (e.g., Z direction).

[0043] A 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.

[0044] An individual battery cell (110) is a basic unit of a lithium ion battery, i.e., a secondary battery. An individual battery cell (110) may include an electrode assembly, an electrolyte, and a cell case. The electrode assembly built into the cell case may include a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The electrode assembly may be either a jelly-roll type or a stack type depending on the assembly form. A jelly-roll type electrode assembly may include a winding structure of a positive electrode, a negative electrode, and a separator interposed therebetween. A stack type electrode assembly may include a plurality of sequentially stacked positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed therebetween. 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 an negative electrode active material.

[0045] Each battery cell (110) may be a pouch-type battery cell, a cylindrical battery cell, or a square battery cell. The electrode assembly of the pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet. The electrode assembly of the cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of the square battery cell is housed in a square metal can.

[0046] A plurality of battery cells (110) provided in the cell assembly (100) may be connected in series and / or in parallel. For example, the plurality of battery cells (110) may be connected in series with each other. For example, the plurality of battery cells (110) may also 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 composed of two or more battery cells (110) connected in parallel with each other and another bank composed of two or more battery cells (110) connected in parallel with each other may be connected in series.

[0047] In exemplary embodiments, a plurality of battery cells (110) provided in a cell assembly (100) may be arranged in a first horizontal direction (e.g., X direction), and individual battery cells (110) may extend in a second horizontal direction (e.g., Y direction). An electrode lead (111) may be provided at at least one of both ends of an individual battery cell (110) along the second horizontal direction (e.g., Y direction). Electrode leads (111) of neighboring battery cells (110) among the plurality of battery cells (110) may be electrically and physically connected to each other.

[0048] A thermally conductive adhesive layer (211) may be disposed between the cell assembly (100) and the base frame (510). The thermally conductive adhesive layer (211) may attach a plurality of battery cells (110) to the base frame (510). An upper portion of the thermally conductive adhesive layer (211) may be in direct contact with each of the plurality of battery cells (110), and a lower portion of the thermally conductive adhesive layer (211) may be in direct contact with the base frame (510). The thermally conductive adhesive layer (211) may thermally couple each of the plurality of 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.

[0049] The inner cover (120) may be disposed on a side of the cell assembly (100) along the second horizontal direction (e.g., Y direction). The inner cover (120) may be connected to a side of each of the battery cells (110) along the second horizontal direction (e.g., Y direction). The inner cover (120) may include an insulating material. The inner cover (120) may support electrode leads (111) of a plurality of battery cells (110) and a plurality of bus bars (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 bus bars (121) may be mounted on the inner cover (120), and each of the plurality of bus bars (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, a plurality of bus bars (121) may each be joined to at least one of the electrode leads (111) of a plurality of battery cells (110) by welding. The plurality of bus bars (121) may include an inter-bus bar for electrically connecting battery cells (110) belonging to the same cell assembly (100) and a terminal bus bar for electrically connecting battery cells (110) belonging to different cell assemblies (100).

[0050] The heat transfer structure (130) can thermally couple 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) can include a material with excellent thermal conductivity, for example, a metal. For example, the heat transfer structure (130) can include copper, aluminum, silver, gold, platinum, tungsten, iron, or a combination thereof.

[0051] 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 a base frame (510).

[0052] The first heat transfer plate (131) is between the inner cover (120) and the outer cover (140), and the first heat transfer plate (131) may have a generally flat plate shape extending in a first horizontal direction (e.g., X direction) and a vertical direction (e.g., Z direction). The first heat transfer plate (131) may include an inner side (1313) and an outer side (1311) that are opposed in a second horizontal direction (e.g., Y direction), and the inner side (1313) and the outer side (1311) of the first heat transfer plate (131) may each be a plane.

[0053] The first heat transfer plate (131) can be thermally and physically attached to the electrode leads (111) of the plurality of battery cells (110) and the plurality of bus bars (121) by a thermally conductive adhesive layer (151). The thermally conductive adhesive layer (151) can 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) can be thermally conductive but electrically insulator. For example, the thermally conductive adhesive layer (151) can include a thermal resin and / or a thermal interface material.

[0054] 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 have a generally flat plate shape extending in a first horizontal direction (e.g., X direction) and a second horizontal direction (e.g., Y direction). The second heat transfer plate (132) may include upper and lower surfaces that are opposed in a vertical direction (e.g., Z direction), and the upper and lower surfaces of the second heat transfer plate (132) may each be a plane. When viewed in cross section, the extension direction of the second heat transfer plate (132) and the extension 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 folded shape.

[0055] 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) can be interposed between the bottom surface of the second heat transfer plate (132) and the base frame (510). The thermally conductive adhesive layer (213) can be thermally conductive but electrically insulator. For example, the thermally conductive adhesive layer (213) can include a thermal resin and / or a thermal interface material.

[0056] When the electrode leads (111) and / or bus bars (121) of the battery cells (110) are heated to a high temperature, if the temperature of the electrode leads (111) and / or bus bars (121) of the battery cells (110) is not lowered, there is a problem that heat is transferred to the center of the battery cells (110), thereby aggravating the heat generation of the battery cells (110). According to exemplary embodiments of the present invention, the electrode leads (111) and bus bars (121) of the battery cells (110) are thermally coupled to a base frame (510) having a cooling function through a heat transfer structure (130), thereby improving the cooling efficiency for the battery cells (110) and effectively controlling the heat generation of the battery cells (110).

[0057] The outer cover (140) may be disposed on a side of the cell assembly (100) along the second horizontal direction (e.g., Y direction). The outer cover (140) may cover a side of the inner cover (120) and a side of the heat transfer structure (130). The outer cover (140) may include 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 disposed between the outer cover (140) and the inner cover (120). The outer cover (140) may include an insulating material. For example, the outer cover (140) may be formed of plastic. The outer cover (140) can be bonded to the heat transfer structure (130) without an adhesive medium such as an adhesive.

[0058] In exemplary embodiments, the outer cover (140) and the heat transfer structure (130) may be integrally formed through insert injection. Insert injection may include the steps of injecting the heat transfer structure (130) into an injection mold, injecting a liquid plastic material into the injection mold, and curing the plastic material. During the curing process of the plastic material, the outer cover (140) formed by curing the plastic material may be integrally joined with the heat transfer structure (130). The coupling between the outer cover (140) and the heat transfer structure (130) may be achieved without an adhesive medium such as an adhesive and / or a fastening structure such as a fixing pin. The outer cover (140) and the heat transfer structure (130) may be integrally formed through insert injection and may be handled as a single part.

[0059] The outer cover (140) can be coupled to the first heat transfer plate (131). The outer cover (140) can be coupled to the outer surface (1311) of the first heat transfer plate (131) so 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) can continuously contact 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 edge and the second edge of the first heat transfer plate (131) which are opposite in the first horizontal direction (e.g., X direction). Furthermore, 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., 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).

[0060] 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., X direction) and a vertical direction (e.g., Z direction). The outer cover (140) may include a plurality of protrusions (141) inserted into the plurality of through holes (133) of the first heat transfer plate (131). The plurality of through holes (133) of the first heat transfer plate (131) may each extend from an outer surface (1311) to an inner surface (1313) of the first heat transfer plate (131). The plurality of protrusions (141) of the outer cover (140) may each be inserted into a corresponding through hole (133) among the plurality of through holes (133) of the first heat transfer plate (131). The plurality of protrusions (141) of the outer cover (140) may extend from the outer surface (1311) of the outer cover (140) to the inner surface (1313) of the outer cover (140) through the corresponding through holes (133) of the plurality of through holes (133) of the first heat transfer plate (131), respectively. The side surfaces of the plurality of 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 through insert injection, the plastic material filling the plurality of through holes (133) of the first heat transfer plate (131) may be the plurality of protrusions (141) of the outer cover (140). As the plurality of protrusions (141) of the outer cover (140) are inserted into the plurality of through holes (133) of the first heat transfer plate (131), the bond between the outer cover (140) and the heat transfer structure (130) can be made more solid.

[0061] In exemplary embodiments, 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 bus bars (121) of the battery cells (110) may be separated from a first region of the first heat transfer plate (131) provided with a plurality of through holes (133). The electrode leads (111) and bus bars (121) of the battery cells (110) may be in contact with a portion of the first heat transfer plate (131) that is involved in heat conduction, but may not be in contact with an insulating outer cover (140) that is not involved in heat conduction.

[0062] The outer cover (140) can be fastened to the inner cover (120). By fastening the outer cover (140) to the inner cover (120), a heat transfer structure (130) integral with the outer cover (140) can be fixed. The outer cover (140) can include a first fastening protrusion (148) at its lower end that is fastened to the inner cover (120), and can include second fastening protrusions (149) at each of its two sides that are fastened to the inner cover (120). The heat transfer structure (130) can include an opening (134) through which the first fastening protrusion (148) of the outer cover (140) passes, and the first fastening protrusion (148) of the outer cover (140) can be fitted into a fastening portion of the inner cover (120) provided at the lower end of the inner cover (120). The second fastening projection (149) of the outer cover (140) can be fitted into the fastening portion of the inner cover (120) provided on the side of the inner cover (120).

[0063] In some exemplary embodiments, the heat transfer structure (130) may have a fastening structure fastened to the inner cover (120). In this case, the fastening structure (i.e., the first fastening protrusion (148) and the second fastening protrusion (149)) for directly fastening the outer cover (140) to the inner cover (120) may be omitted, and the outer cover (140) may be fixed by the heat transfer structure (130) being fastened to the inner cover (120).

[0064] 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., X-direction) with a plurality of battery cells (110) therebetween. One of the pair of fastening frames (170) may be attached to an outermost battery cell (110) among the plurality of battery cells (110), and the other of the pair of fastening frames (170) may be attached to another outermost battery cell (110) among the plurality of battery cells (110). The pair of fastening frames (170) may each be fastened to a support structure of a housing (500) provided on a base frame (510) by fastening bolts (BT). The pair of fastening frames (170) may be fastened to the housing (500) to support the battery cells (110) in the first horizontal direction (e.g., X-direction). A pair of fastening frames (170) can support the battery cells (110) in a first horizontal direction (e.g., X direction) to suppress swelling of the battery cells (110).

[0065] According to exemplary embodiments, since the heat transfer structure (130) and the outer cover (140) are integrally formed through insert injection, the outer cover (140) can have a rigidity level similar to that of the heat transfer structure (130). Accordingly, physical deformation of the outer cover (140), such as bending, can be suppressed.

[0066] In the battery device according to the comparative example, the outer cover has a rib structure for reinforcing rigidity at a portion in contact with the heat transfer structure. According to exemplary embodiments, since the rigidity of the outer cover (140) can be reinforced by the heat transfer structure (130), a separate rib structure for reinforcing the rigidity of the outer cover (140) can be eliminated, and as the separate rib structure is eliminated, the space utilization of the cell assembly (100) and the battery device (10) can be improved.

[0067] According to exemplary embodiments, since the heat transfer structure (130) and the outer cover (140) are integrally formed through insert injection, the outer cover (140) can be joined to the heat transfer structure (130) without an adhesive medium such as an adhesive or a fastening structure such as a fixing pin. Accordingly, the difficulty of manufacturing the outer cover (140) can be reduced, and the issue of poor joining between the outer cover (140) and the heat transfer structure (130) can be prevented.

[0068] According to exemplary embodiments, the electrode leads (111) of the battery cells (110) can be thermally coupled to the cooling frame through the heat transfer structure (130), so that the heat generation of the electrode leads (111) of the battery cells (110) can be effectively controlled, and the cooling efficiency for the battery cells (110) can be improved.

[0069]

[0070] (Example 2)

[0071] FIG. 6 is a schematic diagram showing a portion of an electric vehicle (1000) equipped with a battery pack (1100) according to exemplary embodiments.

[0072] In FIG. 6, an 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 driving wheels. The battery pack (1100) may include the battery device (10) described with reference to FIGS. 1 to 5. According to exemplary embodiments, heat generation of electrode leads (111) of battery cells (110) can be effectively controlled, and cooling efficiency for the battery cells (110) can be improved, thereby improving the safety and reliability of the battery pack and the electric vehicle including the same.

[0073] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. Cooling frame; and Cell assembly arranged on a cooling frame; Including, The above cell assembly, Multiple battery cells; A heat transfer structure including a first heat transfer plate connected to 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; Including, A battery device, 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.

2. In paragraph 1, The outer surface of the first heat transfer plate is flat, A battery device characterized in that the contact surface of the outer cover in contact with the outer surface of the first heat transfer plate is flat.

3. In paragraph 1, The outer surface of the first heat transfer plate has first and second edges that are opposite to each other, A battery device characterized in that 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. In paragraph 1, The above first heat transfer plate includes a plurality of through holes, A battery device characterized in that the outer cover includes a plurality of protrusions inserted into the plurality of through holes of the first heat transfer plate.

5. In paragraph 4, A battery device characterized in that the side surfaces of the plurality of protrusions of the outer cover are coplanar with the inner surface of the first heat transfer plate opposite the outer surface of the first heat transfer plate.

6. In paragraph 1, Further comprising an inner cover supporting the electrode leads of the plurality of battery cells, The first heat transfer plate is disposed between the inner cover and the outer cover, A battery device characterized in that the outer cover is coupled to the inner cover.

7. In paragraph 6, A battery device characterized in that it further includes a bus bar mounted on the inner cover and connected to the electrode leads of the plurality of battery cells.

8. In paragraph 1, The above heat transfer structure comprises a metal, A battery device characterized in that the outer cover comprises plastic.

9. In paragraph 1, A battery device further comprising a thermally conductive adhesive layer that attaches the electrode leads of the plurality of battery cells to the first heat transfer plate.

10. In paragraph 1, A battery device further comprising a thermally conductive adhesive layer that attaches the plurality of battery cells to the cooling frame.

11. In paragraph 1, A battery device characterized in that the cooling frame includes a cooling channel through which a cooling fluid flows.

12. In paragraph 1, A battery device characterized in that the heat transfer structure and the outer cover are formed integrally by an insert injection method.

13. In paragraph 1, A side frame coupled to the periphery of the cooling frame and surrounding the cell assembly; and A top frame coupled to the side frame to cover the cell assembly; A battery device characterized by further comprising:

Images