Battery device

Abstract

The technical concept of the present invention provides a battery device comprising: a housing; the battery cell assembly is arranged in the shell and comprises a plurality of battery cells; the first heat conduction adhesive layer is used for attaching a first area of the battery cell assembly to the shell; the first heat-conducting adhesive layer is used for attaching a first area of the battery cell assembly to the shell, the second heat-conducting adhesive layer is used for attaching a second area of the battery cell assembly to the shell, and the heat conductivity of the first heat-conducting adhesive layer is larger than that of the second heat-conducting adhesive layer. And the adhesive strength of the first heat-conducting adhesive layer is smaller than that of the second heat-conducting adhesive layer.

Description

Technical Field

[0001] This disclosure relates to a battery device. This application claims the benefit of Korean Patent Application No. 10-2024-0122122, filed on September 9, 2024, the disclosure of which is incorporated herein by reference. Background Technology

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, such as mobile phones, laptops, and cordless vacuum cleaners. Recently, the manufacturing cost per unit capacity of secondary batteries has significantly decreased due to improvements in energy density and economies of scale. As the cruising range of battery electric vehicles (BEVs) has increased to levels comparable to fuel cell vehicles, the primary application of secondary batteries is shifting from mobile devices to mobility tools.

[0003] With the increasing use of rechargeable batteries in transportation applications, the need for their safety has grown. Accidents such as fires involving rechargeable batteries in vehicles could endanger the lives of drivers. Therefore, research into technologies to improve the safety of rechargeable batteries is essential. Summary of the Invention

[0004] Technical issues

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

[0006] Technical solution

[0007] To address the aforementioned problems, the present disclosure provides a battery device comprising: a housing; a cell assembly disposed within the housing and including a plurality of battery cells; a first thermally conductive adhesive layer configured to attach a first region of the cell assembly to the housing; and a second thermally conductive adhesive layer configured to attach a second region of the cell assembly to the housing, wherein the thermal conductivity of the first thermally conductive adhesive layer is greater than that of the second thermally conductive adhesive layer, and the adhesive strength of the first thermally conductive adhesive layer is less than that of the second thermally conductive adhesive layer.

[0008] In an exemplary embodiment, each of the plurality of battery cells includes a first portion relatively adjacent to the electrode leads and a second portion relatively distant from the electrode leads, wherein a first thermally conductive adhesive layer contacts the first portion of each of the plurality of battery cells, and wherein a second thermally conductive adhesive layer contacts the second portion of each of the plurality of battery cells.

[0009] In an exemplary embodiment, the cell assembly further includes a busbar frame that supports the electrode leads of the plurality of battery cells.

[0010] In an exemplary embodiment, the battery device further includes: a third thermally conductive adhesive layer configured to attach a third region of the cell assembly located between the first region and the second region of the cell assembly to the housing, wherein the thermal conductivity of the third thermally conductive adhesive layer is between the thermal conductivity of the first thermally conductive adhesive layer and the thermal conductivity of the second thermally conductive adhesive layer, and wherein the adhesive strength of the third thermally conductive adhesive layer is between the adhesive strength of the first thermally conductive adhesive layer and the adhesive strength of the second thermally conductive adhesive layer.

[0011] In an exemplary embodiment, each of the plurality of battery cells includes a first peripheral portion, a second peripheral portion, and a central portion located between the first peripheral portion and the second peripheral portion, wherein the first thermally conductive adhesive layer contacts the first peripheral portion and the second peripheral portion of each of the plurality of battery cells, and wherein the second thermally conductive adhesive layer contacts the central portion of each of the plurality of battery cells.

[0012] In an exemplary embodiment, the battery device further includes a separator pad disposed between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

[0013] In an exemplary embodiment, the spacer pad is in contact with the plurality of battery cells.

[0014] In an exemplary embodiment, the housing includes: a base frame supporting the cell assembly and including a cooling channel configured to allow cooling fluid flow; and a side frame disposed on the base frame, wherein a first thermally conductive adhesive layer and a second thermally conductive adhesive layer are disposed between the cell assembly and the base frame.

[0015] In an exemplary embodiment, the battery device further includes a spacer pad attached to the base frame and in contact with the plurality of battery cells, wherein the first thermally conductive adhesive layer is spaced apart from the second thermally conductive adhesive layer, and wherein the spacer pad is located between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

[0016] In an exemplary embodiment, the housing includes: a base frame supporting the cell assembly; and a side cooling frame disposed between two adjacent cell assemblies among the plurality of cell assemblies, wherein the first thermally conductive adhesive layer and the second thermally conductive adhesive layer are in contact with at least one cell assemblies and the side cooling frame.

[0017] In an exemplary embodiment, the side cooling frame includes cooling channels configured to allow cooling fluid flow.

[0018] In an exemplary embodiment, the battery device further includes a spacer pad attached to the side cooling frame, wherein the first thermally conductive adhesive layer is spaced apart from the second thermally conductive adhesive layer, and wherein the spacer pad is located between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

[0019] In an exemplary embodiment, the housing further includes: a base frame supporting the cell assembly and attached to the first thermally conductive adhesive layer and the second thermally conductive adhesive layer; a side cooling frame disposed between two adjacent battery cells among the plurality of battery cells; a first side thermally conductive adhesive layer configured to attach a first region of a corresponding battery cell among the plurality of battery cells to the cooling frame; and a second side thermally conductive adhesive layer configured to attach a second region of a corresponding battery cell among the plurality of battery cells to the cooling frame, wherein the thermal conductivity of the first side thermally conductive adhesive layer is greater than the thermal conductivity of the second side thermally conductive adhesive layer.

[0020] In an exemplary embodiment, the adhesive strength of the first side thermally conductive adhesive layer is less than the second adhesive strength of the second side thermally conductive adhesive layer.

[0021] In an exemplary embodiment, the battery assembly further includes: a pair of side beams spaced apart from each other, wherein the plurality of battery cells are located between the pair of side beams; and a lifting belt secured to the pair of side beams and extending along the bottom surface of the plurality of battery cells, wherein the lifting belt is disposed between the second thermally conductive adhesive layer and the plurality of battery cells.

[0022] Beneficial effects

[0023] According to the battery device of the exemplary embodiment, portions of the individual battery cells that generate a large amount of heat can be attached to the housing using a thermally conductive adhesive layer with relatively high thermal conductivity, and portions of the individual battery cells that are relatively susceptible to vibration can be attached to the housing using a thermally conductive adhesive layer with relatively high adhesive strength. Therefore, compared to attaching the battery cells to the housing using a single thermally conductive adhesive layer, the temperature uniformity of the battery cells can be improved, and the structural safety of the battery cells can be enhanced.

[0024] The effects obtainable from the exemplary embodiments of this disclosure are not limited to those described above, and those skilled in the art to which the exemplary embodiments of this disclosure pertain can clearly derive and understand other effects not mentioned in the following description. In other words, unintended effects of practicing the exemplary embodiments of this disclosure can also be derived by those skilled in the art from the exemplary embodiments of this disclosure. Attached Figure Description

[0025] Figure 1 This is an exploded perspective view showing a battery device according to an exemplary embodiment.

[0026] Figure 2 This is a plan view showing a portion of a battery device according to an exemplary embodiment.

[0027] Figure 3 This is a cross-sectional view showing a portion of a battery device according to an exemplary embodiment.

[0028] Figure 4 This is a cross-sectional view showing a portion of a battery device according to an exemplary embodiment.

[0029] Figure 5 This is a cross-sectional view showing a portion of a battery device according to an exemplary embodiment.

[0030] Figure 6 This is a plan view showing a portion of a battery device according to an exemplary embodiment.

[0031] Figure 7 It is along Figure 6 A cross-sectional view of the battery device taken from line VII-VII'.

[0032] Figure 8 It is along Figure 6 A cross-sectional view of the battery device taken from line VIII-VIII'.

[0033] Figure 9 This is a cross-sectional view showing a portion of a battery device according to an exemplary embodiment.

[0034] Figure 10This is a cross-sectional view showing a portion of a battery device according to an exemplary embodiment.

[0035] Figure 11 This is a cross-sectional view showing a portion of a battery device according to an exemplary embodiment.

[0036] Figure 12 This is a cross-sectional view showing a portion of a battery device according to an exemplary embodiment. Detailed Implementation

[0037] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that the terms and words used in this specification and claims should not be construed as having their ordinary or dictionary meaning, but rather as having meanings and concepts consistent with the technical spirit of the present disclosure. This is based on the principle that the inventor can define the concepts of terms as he deems appropriate to best describe his disclosure.

[0038] Therefore, it should be understood that the embodiments described herein and the configurations shown in the accompanying drawings are merely the most preferred embodiments of this disclosure and are not an exhaustive list of the technical ideas of this disclosure, and various equivalents and modifications that can replace them may exist at the time of submission.

[0039] Furthermore, in describing this disclosure, specific descriptions of relevant known configurations or features have been omitted, where such detailed descriptions would obscure the essence of this disclosure.

[0040] Because embodiments of this disclosure are provided to explain this disclosure more fully to those skilled in the art, the shapes and dimensions of components in the drawings may be exaggerated, omitted, or shown schematically for clarity. Therefore, the dimensions or proportions of each component do not necessarily represent their actual dimensions or proportions.

[0041] (First Implementation)

[0042] Figure 1 This is an exploded perspective view showing a battery device 10 according to an exemplary embodiment. Figure 2 This is a plan view showing a portion of a battery device 10 according to an exemplary embodiment. Figure 3 This is a cross-sectional view showing a portion of the battery device 10 according to an exemplary embodiment.

[0043] Reference Figures 1 to 3 The battery device 10 may include a housing 100, a plurality of cell assemblies 200 and a base thermally conductive adhesive layer 310.

[0044] The housing 100 may have an internal space for accommodating multiple battery cell assemblies 200. The housing 100 may include a base frame 110, a side frame 120, a top frame 130, a first partition frame 141, and a second partition frame 143.

[0045] The base frame 110 can support multiple cell assemblies 200. The base frame 110 can have a plate-like form extending along a first horizontal direction (e.g., the X-axis direction) and a second horizontal direction (e.g., the Y-axis direction).

[0046] The base frame 110 may include a base cooling channel 111 configured to allow cooling fluid flow. In an exemplary embodiment, the base cooling channel 111 may extend within the base frame 110 in a first horizontal direction (e.g., the X-axis direction) and may be configured to guide cooling fluid in that direction. A conduit 160 configured to deliver cooling fluid may be coupled to the base frame 110. Cooling fluid supplied from an external source may flow sequentially along one of the conduits 160, the base cooling channel 111, and another of the conduits 160. As the cooling fluid flows through the base cooling channel 111, multiple cell assemblies 200 may be cooled. The cooling fluid may include a coolant and / or a refrigerant.

[0047] Side frame 120 can be attached to base frame 110. Side frame 120 can be attached around base frame 110 and can extend along the periphery of base frame 110. Side frame 120 can extend continuously along the periphery of base frame 110 to enclose multiple cell assemblies 200. When viewed in plan view, side frame 120 can have a generally rectangular annular shape.

[0048] The top frame 130 can be connected to the side frame 120 and can cover multiple cell assemblies 200. The top frame 130 can have a plate-like form extending along a first horizontal direction (e.g., the X-axis direction) and a second horizontal direction (e.g., the Y-axis direction).

[0049] The first partition frame 141 and the second partition frame 143 may be disposed on the base frame 110. The first partition frame 141 and the second partition frame 143 may divide or partition the internal space of the housing 100 into a plurality of subspaces. Each cell assembly 200 may be disposed within each of the plurality of subspaces of the housing 100 defined by the first partition frame 141 and the second partition frame 143. The first partition frame 141 and the second partition frame 143 may extend in mutually intersecting directions. The first partition frame 141 may extend in a second horizontal direction (e.g., the Y-axis direction), and the second partition frame 143 may extend in a first horizontal direction (e.g., the X-axis direction).

[0050] Multiple cell assemblies 200 can be mounted on the base frame 110. The multiple cell assemblies 200 can be arranged on the base frame 110 in a first horizontal direction (e.g., the X-axis direction) and / or a second horizontal direction (e.g., the Y-axis direction). Each cell assembly 200 can correspond to a battery module or a cell-to-pack unit.

[0051] Each cell assembly 200 may include multiple battery cells 210, multiple busbar frames 220, and multiple end frames 230.

[0052] Each battery cell 210 is a basic unit of a lithium-ion battery, i.e., a secondary battery. Each battery cell 210 may include an electrode assembly, an electrolyte, and a cell housing. The electrode assembly contained within the cell housing may include a positive electrode, a negative electrode, and a separator inserted between the positive and negative electrodes. Depending on the assembly method, the electrode assembly may be of the wound type or the stacked type. The wound type electrode assembly may include a wound structure of a positive electrode, a negative electrode, and a separator inserted between them. The stacked type electrode assembly may include multiple positive electrodes, multiple negative electrodes, and multiple separators inserted between them in sequence. 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.

[0053] Each battery cell 210 can correspond to 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 within a pouch housing including an aluminum laminate. The electrode assembly of a cylindrical battery cell is housed within a cylindrical metal can. The electrode assembly of a prismatic battery cell is housed within a prismatic metal can.

[0054] Multiple battery cells 210 disposed within each battery cell assembly 200 may be connected in series and / or in parallel. For example, multiple battery cells 210 may be connected in series with each other. For example, multiple battery cells 210 may also be connected in parallel with each other. For example, when a set of two or more battery cells 210 connected in parallel is defined as a group, one group consisting of two or more battery cells 210 connected in parallel and another group consisting of two or more battery cells 210 connected in parallel may be connected in series.

[0055] In an exemplary embodiment, a plurality of battery cells 210 may be arranged along a first horizontal direction (e.g., the X-axis direction), and each battery cell 210 may extend along a second horizontal direction (e.g., the Y-axis direction). Electrode leads 211 may be disposed along the second horizontal direction (e.g., the Y-axis direction) at at least one of the two ends of each battery cell 210. The electrode leads 211 of adjacent battery cells 210 in the plurality of battery cells 210 may be electrically and physically connected to each other.

[0056] Multiple busbar frames 220 can each support the electrode leads 211 of multiple battery cells 210. Each busbar frame 220 may include multiple slits into which the electrode leads 211 of the multiple battery cells 210 are inserted. One of the multiple busbar frames 220 can support the electrode leads 211 disposed on one side of the multiple battery cells 210, and another of the multiple busbar frames 220 can support the electrode leads 211 disposed on the other side of the multiple battery cells 210.

[0057] Each busbar frame 220 may support multiple busbars 221. Each of the multiple busbars 221 may be electrically and physically connected to at least one of the electrode leads 211 of multiple battery cells 210. The multiple busbars 221 may include intermediate busbars for electrically connecting different battery cells 210 within the cell assembly 200 and terminal busbars for electrically connecting the battery cells 210 of the cell assembly 200 to the battery cells 210 of another cell assembly 200.

[0058] Multiple end frames 230 can each be connected to a corresponding busbar frame among multiple busbar frames 220. Each end frame 230 can cover the busbar 221 installed on the corresponding busbar frame 220.

[0059] A base thermally conductive adhesive layer 310 may be disposed between each of the plurality of cell assemblies 200 and the base frame 110, thereby attaching each of the plurality of cell assemblies 200 to the base frame 110. The base thermally conductive adhesive layer 310 may be in direct contact with the plurality of battery cells 210 of the cell assembly 200 and may attach the plurality of battery cells 210 of the cell assembly 200 to the base frame 110. The plurality of battery cells 210 of the cell assembly 200 may be thermally and physically coupled to the base frame 110 via the base thermally conductive adhesive layer 310. Heat generated by the plurality of battery cells 210 of the cell assembly 200 may be transferred to the base frame 110 through the base thermally conductive adhesive layer 310. The base thermally conductive adhesive layer 310 may include a thermally conductive resin and / or a thermal interface material (TIM).

[0060] The base thermally conductive adhesive layer 310 may include multiple thermally conductive adhesive layers with different material compositions, different thermal conductivity, and / or different adhesive strengths. The multiple thermally conductive adhesive layers of the base thermally conductive adhesive layer 310 may be attached to different regions of a single cell assembly 200. The multiple thermally conductive adhesive layers of the base thermally conductive adhesive layer 310 may include heat-dissipating fillers, wherein the content of the heat-dissipating fillers in the multiple thermally conductive adhesive layers of the base thermally conductive adhesive layer 310 may differ from each other. Heat-dissipating fillers may include, for example, alumina, boron nitride, aluminum nitride, zinc oxide, magnesium oxide, or combinations thereof.

[0061] In an exemplary embodiment, the base thermally conductive adhesive layer 310 may include a first base thermally conductive adhesive layer 311 in contact with a first region of the cell assembly 200 and a second base thermally conductive adhesive layer 313 in contact with a second region of the cell assembly 200. The first base thermally conductive adhesive layer 311 can attach the first region of the cell assembly 200 to the base frame 110, and the second base thermally conductive adhesive layer 313 can attach the second region of the cell assembly 200 to the base frame 110. The first base thermally conductive adhesive layer 311 can attach portions of a plurality of battery cells 210 in the first region of the cell assembly 200 to the base frame 110, and the second base thermally conductive adhesive layer 313 can attach portions of a plurality of battery cells 210 in the second region of the cell assembly 200 to the base frame 110.

[0062] The first base thermally conductive adhesive layer 311 may have a first thermal conductivity and a first adhesive strength, and the second base thermally conductive adhesive layer 313 may have a second thermal conductivity and a second adhesive strength. The first thermal conductivity of the first base thermally conductive adhesive layer 311 may be greater than the second thermal conductivity of the second base thermally conductive adhesive layer 313. The first adhesive strength of the first base thermally conductive adhesive layer 311 may be less than the second adhesive strength of the second base thermally conductive adhesive layer 313. The first base thermally conductive adhesive layer 311, having a relatively high thermal conductivity, can be attached to areas within the cell assembly 200 that generate a relatively large amount of heat, thereby enhancing the cooling of the cell assembly 200. The second base thermally conductive adhesive layer 313, having a relatively low thermal conductivity, can be attached to areas within the cell assembly 200 that generate a relatively small amount of heat. By attaching the first base thermally conductive adhesive layer 311 to areas within the cell assembly 200 that generate a relatively large amount of heat and attaching the second base thermally conductive adhesive layer 313 to areas within the cell assembly 200 that generate a relatively small amount of heat, temperature variations within the cell assembly 200 can be reduced. A second base thermally conductive adhesive layer 313 with relatively high adhesive strength is attached to a relatively vibration-sensitive area within the cell assembly 200, thereby enhancing the structural safety of the cell assembly 200.

[0063] In an exemplary embodiment, the first thermal conductivity of the first base thermally conductive adhesive layer 311 is between about 3 W / (m·K) and 10 W / (m·K), about 4 W / (m·K) and 9 W / (m·K), about 5 W / (m·K) and 8 W / (m·K), or about 6 W / (m·K) and 7 W / (m·K). In an exemplary embodiment, the second thermal conductivity of the second base thermally conductive adhesive layer 313 may be between about 20% and about 80% of the first thermal conductivity of the first base thermally conductive adhesive layer 311, between about 30% and about 70%, or between about 40% and about 60%.

[0064] In an exemplary embodiment, the second adhesive strength of the second base thermally conductive adhesive layer 313 may be between about 1 MPa and about 5 MPa, between about 1.5 MPa and about 4.5 MPa, between about 2 MPa and about 4 MPa, or between about 2.5 MPa and about 3.5 MPa. In an exemplary embodiment, the first adhesive strength of the first base thermally conductive adhesive layer 311 may be between about 10% and about 90%, between about 20% and about 80%, between about 30% and about 70%, or between about 40% and about 60% of the second adhesive strength of the second base thermally conductive adhesive layer 313.

[0065] In an exemplary embodiment, each of the plurality of battery cells 210 may include a first portion relatively adjacent to the electrode lead 211 and a second portion relatively distant from the electrode lead 211. The first portions of the plurality of battery cells 210 may be located within a first region of the cell assembly 200, and the second portions of the plurality of battery cells 210 may be located within a second region of the cell assembly 200. A first base thermally conductive adhesive layer 311 may contact the first portions of the plurality of battery cells 210, and a second base thermally conductive adhesive layer 313 may contact the second portions of the plurality of battery cells 210. The first portion of the battery cell 210 relatively adjacent to the electrode lead 211 is the portion that generates relatively more heat during operation of the battery cell 210, while the second portion of the battery cell 210 relatively distant from the electrode lead 211 is the portion that generates relatively less heat during operation of the battery cell 210. The first base thermally conductive adhesive layer 311, having a relatively high thermal conductivity, is attached to the first portion of each of the plurality of battery cells 210, thereby enhancing the cooling of the plurality of battery cells 210. A second base thermally conductive adhesive layer 313 with relatively low thermal conductivity can be attached to a second portion of each of the plurality of battery cells 210. When a first base thermally conductive adhesive layer 311 is attached to a first portion of each of the plurality of battery cells 210 and a second base thermally conductive adhesive layer 313 is attached to a second portion of each of the plurality of battery cells 210, temperature variations within each of the plurality of battery cells 210 can be reduced. Within each battery cell 210, the first portion of the battery cell 210 is supported by a busbar frame 220 and an end frame 230, thereby providing relatively high structural safety. The second portion of the battery cell 210 is relatively far from the busbar frame 220 and the end frame 230, thereby providing relatively low structural safety. The second base thermally conductive adhesive layer 313 with relatively high adhesive strength can attach the respective second portions of the plurality of battery cells 210 to the base frame 110, thereby enhancing the structural safety of the plurality of battery cells 210.

[0066] In an exemplary embodiment, each of the plurality of battery cells 210 may include a first peripheral portion connected to an electrode lead 211, a second peripheral portion connected to another electrode lead 211, and a central portion between the first and second peripheral portions. The battery cell 210 may extend in a second horizontal direction (e.g., the Y-axis direction), and the central portion of the battery cell 210 may be located between the first and second peripheral portions in the second horizontal direction (e.g., the Y-axis direction). The first and second peripheral portions of each battery cell 210 may be within a first region of the cell assembly 200, and the central portion of each battery cell 210 may be within a second region of the cell assembly 200.

[0067] A first base thermally conductive adhesive layer 311 may contact a first peripheral portion and a second peripheral portion of each battery cell 210, and a second base thermally conductive adhesive layer 313 may contact a center portion of each battery cell 210. The first and second peripheral portions of the battery cell 210 are respectively relatively adjacent to the electrode leads 211 and are portions that generate a relatively large amount of heat during operation of the battery cell 210. The center portion of the battery cell 210 is relatively far from the electrode leads 211 and is a portion that generates relatively less heat during operation of the battery cell 210. The first base thermally conductive adhesive layer 311, having a relatively high thermal conductivity, is attached to the first and second peripheral portions of each of the plurality of battery cells 210, thereby enhancing cooling of the plurality of battery cells 210. The second base thermally conductive adhesive layer 313, having a relatively low thermal conductivity, is attached to the center portion of each of the plurality of battery cells 210. By attaching a first base thermally conductive adhesive layer 311 to the first and second peripheral portions of each of the plurality of battery cells 210, and attaching a second base thermally conductive adhesive layer 313 to the center portion of each of the plurality of battery cells 210, temperature variations within each of the plurality of battery cells 210 can be reduced. By adjusting the size of the center portion of the battery cell 210 in contact with the second base thermally conductive adhesive layer 313, temperature deviations between regions of the battery cell 210 can be controlled more effectively. For example, the length of the center portion of the battery cell 210 in contact with the second base thermally conductive adhesive layer 313 in the second horizontal direction (e.g., the Y-axis direction) can be between about 10% to about 70%, about 20% to about 60%, or about 30% to about 50% of the length of the battery cell 210 along the second horizontal direction (e.g., the Y-axis direction).

[0068] The first and second peripheral portions of the battery cell 210 are supported by the busbar frame 220 and the end frame 230, respectively, thus providing relatively high structural safety. The center portion of the battery cell 210 is relatively far from the busbar frame 220 and the end frame 230, thus providing relatively low structural safety. A second base thermally conductive adhesive layer 313 with relatively high adhesive strength attaches the respective center portions of the plurality of battery cells 210 to the base frame 110, thereby enhancing the structural safety of the plurality of battery cells 210.

[0069] According to the exemplary embodiment of the battery device 10, regions within each battery cell 210 that generate relatively high heat can be attached to the housing 100 using a thermally conductive adhesive layer with relatively high thermal conductivity, while regions within each battery cell 210 that are relatively susceptible to vibration can be attached to the housing 100 using a thermally conductive adhesive layer with relatively high adhesive strength. Therefore, compared to attaching the battery cells 210 to the housing 100 using a single thermally conductive adhesive layer, this method improves the temperature uniformity of the battery cells 210 and enhances their structural safety.

[0070] (Second Implementation)

[0071] Figure 4 This is a cross-sectional view showing a portion of a battery device 10A according to an exemplary embodiment. Here, with regard to... Figures 1 to 3 The differences in the battery device 10 shown are related to... Figure 4 The battery device 10A shown will be described.

[0072] Reference Figure 4 In the battery assembly 10A, the base thermally conductive adhesive layer 310A includes a first base thermally conductive adhesive layer 311 in contact with a first region of the cell assembly 200, a second base thermally conductive adhesive layer 313 in contact with a second region of the cell assembly 200, and a third base thermally conductive adhesive layer 315 in contact with a third region of the cell assembly 200. The third base thermally conductive adhesive layer 315 can attach a portion of the battery cell 210 in the third region of the cell assembly 200 to the base frame 110. The third base thermally conductive adhesive layer 315 can be disposed between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

[0073] The third base thermally conductive adhesive layer 315 may have a third thermal conductivity and a third adhesive strength. The third thermal conductivity of the third base thermally conductive adhesive layer 315 may be between the first thermal conductivity of the first base thermally conductive adhesive layer 311 and the second thermal conductivity of the second base thermally conductive adhesive layer 313. The third adhesive strength of the third base thermally conductive adhesive layer 315 may be between the first adhesive strength of the first base thermally conductive adhesive layer 311 and the second adhesive strength of the second base thermally conductive adhesive layer 313.

[0074] In an exemplary embodiment, each of the plurality of battery cells 210 may include a first peripheral portion connected to an electrode lead 211, a second peripheral portion connected to another electrode lead 211, a central portion, a first intermediate portion between the central portion and the first peripheral portion, and a second intermediate portion between the central portion and the second peripheral portion. A first base thermally conductive adhesive layer 311 may be attached to the first and second peripheral portions of each battery cell 210, a second base thermally conductive adhesive layer 313 may be attached to the central portion of each battery cell 210, and a third base thermally conductive adhesive layer 315 may be attached to the first and second intermediate portions of each battery cell 210.

[0075] (Third implementation method)

[0076] Figure 5 This is a cross-sectional view showing a portion of the battery device 10B according to an exemplary embodiment. The following discussion focuses on... Figures 1 to 3 The differences in the battery device 10 shown are related to... Figure 5 The battery device 10B shown will be described.

[0077] Reference Figure 5 The battery device 10B may further include a spacer 350 disposed between the first base thermally conductive adhesive layer 311 and the second base thermally conductive adhesive layer 313. The spacer 350 may be attached to the base frame 110. For example, the spacer 350 may extend in a first horizontal direction (e.g., the X-axis direction), and the first base thermally conductive adhesive layer 311 and the second base thermally conductive adhesive layer 313 may be spaced apart in a second horizontal direction (e.g., the Y-axis direction), with the spacer 350 inserted between them. The spacer 350 is disposed between the first base thermally conductive adhesive layer 311 and the second base thermally conductive adhesive layer 313 to prevent or suppress mixing between the first base thermally conductive adhesive layer 311 and the second base thermally conductive adhesive layer 313.

[0078] During the process of mounting the battery cell assembly 200 onto the housing 100, after applying the first base thermally conductive adhesive layer 311 and the second base thermally conductive adhesive layer 313 to the base frame 110, the battery cell assembly 200 can be mounted onto the base frame 110. During this process, the materials forming the first base thermally conductive adhesive layer 311 and the second base thermally conductive adhesive layer 313 can be extruded and applied onto the battery cell assembly 200. At this time, the spacer 350 disposed between the first base thermally conductive adhesive layer 311 and the second base thermally conductive adhesive layer 313 can prevent or suppress mixing between the materials forming the first base thermally conductive adhesive layer 311 and the materials forming the second base thermally conductive adhesive layer 313.

[0079] The separator 350 may comprise a material having a predetermined elasticity. When the cell assembly 200 is disposed on the separator 350, the separator 350 is compressed, and the thickness of the separator 350 may decrease from its initial thickness. In an exemplary embodiment, the separator 350 may comprise polyurethane resin, silicone resin, or a combination thereof.

[0080] (Fourth Implementation)

[0081] Figure 6 This is a plan view showing a portion of a battery device 10C according to an exemplary embodiment. Figure 7 It is along Figure 6 A cross-sectional view of battery device 10C taken from line VII-VII'. Figure 8 It is along Figure 6 The cross-sectional view of battery device 10C taken along line VIII-VIII'. The following is a description of... Figures 6 to 8 The battery device 10C shown will be described in detail, with a focus on its compatibility with... Figures 1 to 3 The differences in the battery device 10 shown.

[0082] See Figures 6 to 8 In the battery device 10C, the cell assembly 200A may include a plurality of battery cells 210A arranged on a base frame 110 in a first horizontal direction (e.g., the X-axis direction) and a second horizontal direction (e.g., the Y-axis direction). Each of the plurality of battery cells 210A may correspond to a prismatic battery cell. The plurality of battery cells 210A may be attached to the base frame 110 via a base thermally conductive adhesive layer 310. For example, each battery cell 210A may be attached to the base frame 110 via a first base thermally conductive adhesive layer 311 and a second base thermally conductive adhesive layer 313.

[0083] The housing 100 of the battery device 10C may include a plurality of side cooling frames 150 disposed on a base frame 110. Each side cooling frame 150 may be disposed between two adjacent battery cells 210A of a plurality of battery cells 210A and may be attached to the side of the two battery cells 210A. In an exemplary embodiment, the plurality of side cooling frames 150 may each be spaced apart from each other in a second horizontal direction (e.g., the Y-axis direction), and the plurality of side cooling frames 150 may each extend in the second horizontal direction (e.g., the Y-axis direction).

[0084] The side cooling frame 150 may include a material with high thermal conductivity, such as a metal. For example, the side cooling frame 150 may include aluminum, copper, gold, silver, tungsten, or combinations thereof.

[0085] The side cooling frame 150 may include side cooling channels 151 configured to allow the flow of cooling fluid. In an exemplary embodiment, the side cooling channels 151 may extend within the side cooling frame 150 in a second horizontal direction (e.g., the Y-axis direction) and may be configured to guide cooling fluid in the second horizontal direction (e.g., the Y-axis direction). Cooling of multiple battery cells 210A can be performed as externally supplied cooling fluid flows along the side cooling channels 151. The cooling fluid may include cooling water and / or refrigerant.

[0086] The battery device 10C may include a side thermally conductive adhesive layer 330 disposed between a side cooling frame 150 and a battery cell 210A, the side thermally conductive adhesive layer 330 being configured to attach the side cooling frame 150 to the battery cell 210A. The battery cell 210A may be thermally and physically coupled to the side cooling frame 150 via the side thermally conductive adhesive layer 330. Heat generated from the battery cell 210A may be transferred to the side cooling frame 150 via the side thermally conductive adhesive layer 330. The side thermally conductive adhesive layer 330 may include a thermal resin and / or a thermal interface material.

[0087] The side thermally conductive adhesive layer 330 may include multiple thermally conductive adhesive layers with different material compositions, different thermal conductivity, and / or different adhesive strengths. The multiple thermally conductive adhesive layers of the side thermally conductive adhesive layer 330 may be attached to different regions of the battery cell 210A. The multiple thermally conductive adhesive layers of the side thermally conductive adhesive layer 330 may include heat-dissipating fillers, wherein the content of the heat-dissipating fillers may vary among the multiple thermally conductive adhesive layers of the side thermally conductive adhesive layer 330. Heat-dissipating fillers may include, for example, alumina, boron nitride, aluminum nitride, zinc oxide, magnesium oxide, or combinations thereof.

[0088] In an exemplary embodiment, the side thermally conductive adhesive layer 330 may include a first side thermally conductive adhesive layer 331 in contact with a first region of the battery cell 210A and a second side thermally conductive adhesive layer 333 in contact with a second region of the battery cell 210A. The first side thermally conductive adhesive layer 331 can attach the first region of the battery cell 210A to the side cooling frame 150, and the second side thermally conductive adhesive layer 333 can attach the second region of the battery cell 210A to the side cooling frame 150.

[0089] The first thermally conductive adhesive layer 331 may have a first thermal conductivity and a first adhesive strength, and the second thermally conductive adhesive layer 333 may have a second thermal conductivity and a second adhesive strength. The first thermal conductivity of the first thermally conductive adhesive layer 331 may be greater than the second thermal conductivity of the second thermally conductive adhesive layer 333, and the first adhesive strength of the first thermally conductive adhesive layer 331 may be less than the second adhesive strength of the second thermally conductive adhesive layer 333. The first thermally conductive adhesive layer 331, having a relatively high thermal conductivity, adheres to the region within the battery cell 210A that generates a relatively large amount of heat, thereby enhancing the cooling of the battery cell 210A.

[0090] In an exemplary embodiment, the first thermal conductivity of the first-side thermally conductive adhesive layer 331 is between about 3 W / (m·K) and 10 W / (m·K), about 4 W / (m·K) and 9 W / (m·K), about 5 W / (m·K) and 8 W / (m·K), or about 6 W / (m·K) and 7 W / (m·K). In an exemplary embodiment, the second thermal conductivity of the second-side thermally conductive adhesive layer 333 may be between about 20% and about 80% of the first thermal conductivity of the first-side thermally conductive adhesive layer 331, between about 30% and about 70%, or between about 40% and about 60%.

[0091] In an exemplary embodiment, the second adhesive strength of the second-side thermally conductive adhesive layer 333 may be between about 1 MPa and about 5 MPa, between about 1.5 MPa and about 4.5 MPa, between about 2 MPa and about 4 MPa, or between about 2.5 MPa and about 3.5 MPa. In an exemplary embodiment, the first adhesive strength of the first-side thermally conductive adhesive layer 331 may be between about 10% and about 90% of the second adhesive strength of the second-side thermally conductive adhesive layer 333, between about 20% and about 80%, between about 30% and about 70%, or between about 40% and about 60%.

[0092] In an exemplary embodiment, a portion of the electrode leads 213 of the battery cell 210A may be located on the upper surface of the battery cell 210A. The battery cell 210A may include an upper portion relatively adjacent to the electrode leads 213 and a lower portion relatively distant from the electrode leads 213. A first-side thermally conductive adhesive layer 331 may contact the upper portion of the battery cell 210A, and a second-side thermally conductive adhesive layer 333 may contact the lower portion of the battery cell 210A. The upper portion of the battery cell 210A relatively adjacent to the electrode leads 213 is the portion that generates relatively more heat during operation of the battery cell 210A, while the lower portion of the battery cell 210A relatively distant from the electrode leads 213 is the portion that generates relatively less heat during operation of the battery cell 210A. The first-side thermally conductive adhesive layer 331, having a relatively high thermal conductivity, is attached to the upper portion of the battery cell 210A, thereby enhancing the cooling of the plurality of battery cells 210A. A second thermally conductive adhesive layer 333 with relatively low thermal conductivity can be attached to the lower part of the battery cell 210A. By attaching the first thermally conductive adhesive layer 331 to the upper part of the battery cell 210A and attaching the second thermally conductive adhesive layer 333 to the lower part of the battery cell 210A, temperature changes within the battery cell 210A can be reduced.

[0093] (Fifth Implementation)

[0094] Figure 9 This is a cross-sectional view showing a portion of a battery device 10D according to an exemplary embodiment. The following discussion focuses on... Figures 6 to 8 The differences of the battery device 10C shown are related to... Figure 9 The battery device 10D shown will be described.

[0095] Reference Figure 9 The battery device 10D may further include a spacer 360 disposed between a first-side thermally conductive adhesive layer 331 and a second-side thermally conductive adhesive layer 333. The spacer 360 may be attached to the side cooling frame 150. For example, the spacer 360 may extend in a second horizontal direction (e.g., the Y-axis direction), and the first-side thermally conductive adhesive layer 331 and the second-side thermally conductive adhesive layer 333 may be spaced apart in a vertical direction (e.g., the Z-axis direction), with the spacer 360 inserted between them. The spacer 360, disposed between the first-side thermally conductive adhesive layer 331 and the second-side thermally conductive adhesive layer 333, prevents or inhibits mixing between the two layers.

[0096] The separator 360 may include a material with predetermined elasticity. When the cell assembly 200 is placed on the separator 360, the separator 360 is compressed, and the thickness of the separator 360 may decrease from its initial thickness. In an exemplary embodiment, the separator 360 may include polyurethane resin, silicone resin, or a combination thereof.

[0097] (Sixth Implementation Method)

[0098] Figure 10 This is a cross-sectional view showing a portion of a battery device 10E according to an exemplary embodiment. The following discussion focuses on... Figures 6 to 8 The differences of the battery device 10C shown are related to... Figure 10 The battery device 10E shown will be described.

[0099] Reference Figure 10 In the battery device 10E, the battery cell 210 may include a first peripheral portion, a center portion, and a second peripheral portion arranged in a second horizontal direction (e.g., the Y-axis direction). A first-side thermally conductive adhesive layer 331 may be attached to the first and second peripheral portions of the battery cell 210, and a second-side thermally conductive adhesive layer 333 may be attached to the center portion of the battery cell 210. The battery cell 210 may include a pair of electrode leads 211 disposed on the upper surface of the battery cell 210, wherein one of the electrode leads 211 is located at the first peripheral portion of the battery cell 210, and the remaining electrode lead 211 may be located at the second peripheral portion of the battery cell 210. The first-side thermally conductive adhesive layer 331, having a relatively high thermal conductivity, may be attached to the first and second peripheral portions of the battery cell 210, thereby enhancing the cooling of the battery cell 210. The second-side thermally conductive adhesive layer 333, having a relatively low thermal conductivity, may be attached to the center portion of the battery cell 210A. By attaching the first thermally conductive adhesive layer 331 to the first and second peripheral portions of the battery cell 210A, and attaching the second thermally conductive adhesive layer 333 to the center of the battery cell 210A, the temperature variation within the battery cell 210A can be reduced.

[0100] (Seventh Implementation)

[0101] Figure 11 This is a cross-sectional view showing a portion of a battery device 10F according to an exemplary embodiment. Figure 12 This is a cross-sectional view showing a portion of the battery device 10F according to an exemplary embodiment. The following discussion focuses on... Figures 1 to 3 The differences in the battery device 10 shown are related to... Figure 11 and Figure 12 The battery device 10F shown will be described.

[0102] See Figure 11 and Figure 12 In the battery device 10F, the cell assembly 200B may include a pair of side beams 260 and a lifting belt 240.

[0103] The pair of side beams 260 may be spaced apart in a second horizontal direction (e.g., the Y-axis direction), with a plurality of battery cells 210 between them. One of the side beams 260 may be attached to the outermost battery cell 210 of the plurality of battery cells 210, and the other of the side beams 260 may be attached to another outermost battery cell 210 of the plurality of battery cells 210. The pair of side beams 260 may each be fastened to a corresponding first partition frame 141 in the first partition frame 141 of the housing 100 by fastening members 251 (e.g., bolts).

[0104] The lifting belt 240 can be connected to the pair of side beams 260 and can support multiple battery cells 210. The lifting belt 240 may include a first flange 241 connected to one of the pair of side beams 260, a second flange 243 connected to the remaining one of the pair of side beams 260, and a support plate 245 supporting the multiple battery cells 210. The first flange 241 can be connected to one end of the support plate 245, and the second flange 243 can be connected to the other end of the support plate 245. The first flange 241 can be connected to one of the pair of side beams 260 by a fastening member 251, and the second flange 243 can be connected to the remaining one of the pair of side beams 260 by another fastening member 251. The support plate 245 of the lifting belt 240 contacts the bottom surface of the multiple battery cells 210 and can support the multiple battery cells 210. The lifting belt 240 may have a single structure in which the first flange 241, the second flange 243, and the support plate 245 are integrally formed together. The lifting belt 240 may include metal. When the cell assembly 200B is mounted onto or detached from the housing 100, a lifting clamp is secured to the cell assembly 200B, and then the lifting clamp is lifted to move the cell assembly 200B. The lifting belt 240 supports multiple battery cells 210, thereby preventing or suppressing sagging of the battery cells 210 due to their weight as the cell assembly 200B is transferred by the lifting clamp.

[0105] In an exemplary embodiment, the support plate 245 of the lifting belt 240 can be inserted between the second base thermally conductive adhesive layer 313 and the base frame 110. The center portion of each battery cell 210 is attached to the base frame 110 via the second base thermally conductive adhesive layer 313, which has relatively high adhesive strength, while the first and second peripheral portions of each battery cell 210 are attached to the base frame 110 via a first base thermally conductive adhesive layer 311, which has relatively low adhesive strength. Since the lifting belt 240 is disposed between the plurality of battery cells 210 and the base frame 110, the plurality of battery cells 210 do not directly contact the second base thermally conductive adhesive layer 313. Separation of the cell assembly 200B from the base frame 110 can be achieved by separating the first base thermally conductive adhesive layer 311 from the plurality of battery cells 210 and separating the second base thermally conductive adhesive layer 313 from the lifting belt 240. Since the multiple battery cells 210 do not directly contact the second base thermally conductive adhesive layer 313, damage to the battery cells 210 can be prevented during the separation of the cell assembly 200B from the base frame 110. Furthermore, since the first base thermally conductive adhesive layer 311, which is directly attached to the multiple battery cells 210, has relatively low adhesive strength, there is virtually no risk of damaging the multiple battery cells 210 during the separation of the cell assembly 200B from the base frame 110.

[0106] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, it should be understood that the configurations shown in the drawings or the embodiments described herein are merely one embodiment of the present disclosure and do not represent all the technical ideas of the present disclosure, and various equivalents and modifications may exist to replace them at the time of filing this application.

[0107] Description of reference numerals in the attached figures

[0108] 10: Battery assembly 100: Housing

[0109] 110: Base frame; 120: Side frame

[0110] 130: Top frame 141: First dividing frame

[0111] 143: Second partition frame; 200: Cell assembly

[0112] 210: Battery cell; 220: Busbar frame

[0113] 230: End frame

[0114] 310: Base thermally conductive adhesive layer

[0115] 311: First base thermally conductive adhesive layer

[0116] 313: Second base thermally conductive adhesive layer

Claims

1. A battery device, the battery device comprising: case; A battery cell assembly, wherein the battery cell assembly is disposed within the housing and includes a plurality of battery cells; A first thermally conductive adhesive layer is configured to attach a first region of the cell assembly to the housing; as well as A second thermally conductive adhesive layer is configured to attach a second region of the cell assembly to the housing. Wherein, the thermal conductivity of the first thermally conductive adhesive layer is greater than that of the second thermally conductive adhesive layer, and Wherein, the adhesive strength of the first thermally conductive adhesive layer is less than the adhesive strength of the second thermally conductive adhesive layer.

2. The battery device according to claim 1, wherein, Each of the plurality of battery cells includes a first portion relatively adjacent to the electrode leads and a second portion relatively distant from the electrode leads. Wherein, the first thermally conductive adhesive layer contacts the first portion of each of the plurality of battery cells, and The second thermally conductive adhesive layer contacts the second portion of each of the plurality of battery cells.

3. The battery device according to claim 2, wherein, The cell assembly also includes a busbar frame that supports the electrode leads of the plurality of battery cells.

4. The battery device according to claim 2, further comprising: A third thermally conductive adhesive layer is configured to attach a third region of the cell assembly to the housing, the third region being located between the first and second regions of the cell assembly. Wherein, the thermal conductivity of the third thermally conductive adhesive layer is between that of the first thermally conductive adhesive layer and that of the second thermally conductive adhesive layer, and The adhesive strength of the third thermally conductive adhesive layer is between that of the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

5. The battery device according to claim 1, wherein, Each of the plurality of battery cells includes a first peripheral portion, a second peripheral portion, and a central portion located between the first peripheral portion and the second peripheral portion. The first thermally conductive adhesive layer contacts the first peripheral portion and the second peripheral portion of each of the plurality of battery cells, and The second thermally conductive adhesive layer contacts the center portion of each of the plurality of battery cells.

6. The battery device according to claim 1, further comprising: A separator pad is disposed between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

7. The battery device according to claim 6, wherein, The separator pad is in contact with the plurality of battery cells.

8. The battery device according to claim 1, wherein, The housing includes: A base frame supporting the cell assembly and including cooling channels configured to allow cooling fluid flow; and Side frames, which are mounted on the base frame. The first thermally conductive adhesive layer and the second thermally conductive adhesive layer are disposed between the cell assembly and the base frame.

9. The battery device according to claim 8, further comprising: A spacer pad, which is attached to the base frame and contacts the plurality of battery cells. The first thermally conductive adhesive layer is spaced apart from the second thermally conductive adhesive layer, and the spacer pad is located between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

10. The battery device according to claim 1, wherein, The housing includes: A base frame supporting the battery cell assembly; and A side cooling frame is disposed between two adjacent battery cells among the plurality of battery cells. The first thermally conductive adhesive layer and the second thermally conductive adhesive layer are in contact with at least one of the plurality of battery cells and the side cooling frame.

11. The battery device according to claim 10, wherein, The side cooling frame includes cooling channels configured to allow cooling fluid flow.

12. The battery device according to claim 10, further comprising: A spacer pad, the spacer pad being attached to the side cooling frame, The first thermally conductive adhesive layer is spaced apart from the second thermally conductive adhesive layer, and the spacer pad is located between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer.

13. The battery device according to claim 1, wherein, The housing also includes: A base frame that supports the cell assembly and is attached to the first thermally conductive adhesive layer and the second thermally conductive adhesive layer; A side cooling frame is disposed between two adjacent battery cells among the plurality of battery cells; A first side thermally conductive adhesive layer, configured to attach a first region of a corresponding battery cell among the plurality of battery cells to the side cooling frame; and A second thermally conductive adhesive layer is configured to attach a second region of a corresponding battery cell from the plurality of battery cells to the side cooling frame. The thermal conductivity of the first thermally conductive adhesive layer is greater than that of the second thermally conductive adhesive layer.

14. The battery device according to claim 13, wherein, The adhesive strength of the first side thermally conductive adhesive layer is less than the second adhesive strength of the second side thermally conductive adhesive layer.

15. The battery device according to claim 1, wherein, The battery cell assembly also includes: A pair of side beams, the pair of side beams being spaced apart from each other, and the plurality of battery cells being located between the pair of side beams; and A lifting belt, which is fastened to the pair of side beams and extends along the bottom surface of the plurality of battery cells, The lifting strip is disposed between the second thermally conductive adhesive layer and the plurality of battery cells.

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