Battery device and electric vehicle

Abstract

The embodiment of the application provides a battery device and an electric vehicle, and relates to the technical field of batteries. The battery device comprises an upper cover plate, a battery cell group, a battery package frame and a liquid cooling plate; the upper cover plate and the battery package frame are matched and installed; the battery cell group is installed in the interior of the battery package frame; the battery cell group comprises a plurality of battery cells installed side by side; the battery cell comprises a battery cell body and a flange; the battery cell body and the flange are matched and installed, and the flange protrudes from the battery cell body; the liquid cooling plate comprises a plurality of convex flow channels; a groove is arranged between two adjacent convex flow channels; the convex flow channels are arranged opposite to the side surface of the battery cell body; and the flange is installed in the groove. The battery device can improve the heat management effect of the battery cell with the flange.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electric vehicle. Background Technology

[0002] Currently, a type of rectangular battery cell is available on the market. The positive and negative terminals of this cell protrude from the main surface of the cell, and it also features flanges. These flanges facilitate the design of welding the cells into a single unit. However, the flanges around the cell create difficulties when integrating it into modules or packs. Because of the flanges, the cell contacts the flange first when it comes into contact with the liquid cooling plate, preventing the liquid cooling plate from making direct contact with the main surface of the cell. This significantly reduces the heat conduction area, resulting in poor thermal management and making it difficult to meet design goals. Summary of the Invention

[0003] The purpose of this application is to provide a battery device and an electric vehicle that can improve the thermal management effect of battery cells with flanges.

[0004] In a first aspect, embodiments of this application provide a battery device, including an upper cover, a cell assembly, a battery pack frame, and a liquid cooling plate;

[0005] The upper cover plate and the battery pack frame are matched and installed, and the battery cell assembly is installed inside the battery pack frame.

[0006] The battery cell assembly includes multiple battery cells installed side by side. Each battery cell includes a battery cell body and a flange edge. The battery cell body and the flange edge are matched and installed, and the flange edge protrudes from the battery cell body.

[0007] The liquid cooling plate includes multiple convex flow channels, and two adjacent convex flow channels are provided with a groove. The convex flow channels are arranged opposite to the side of the battery cell body, and the flange edge is installed in the groove.

[0008] In the above implementation process, the battery cell in the battery device is provided with a flange edge, which can facilitate the welding of the battery cell into one piece. However, the flange edge itself will affect the thermal management effect of the battery cell. By setting a liquid cooling plate with convex flow channels, the convex flow channels are set opposite to the side of the battery cell body, which can ensure that the liquid cooling plate is as close as possible to or in contact with the side of the battery cell body, thereby achieving a cooling effect. In addition, the groove formed between the two convex flow channels of the liquid cooling plate can provide space for the flange edge of the battery cell and can also play a role in limiting the position of the battery cell during assembly. Thus, the battery device can improve the thermal management effect of the battery cell with flange edge.

[0009] Furthermore, the battery device also includes a heat-conducting mechanism disposed between the battery cell assembly and the liquid cooling plate. The shape of the heat-conducting mechanism matches the shape of the liquid cooling plate. One side surface of the heat-conducting mechanism is in contact with the surface of the battery cell body, and the other side surface of the heat-conducting mechanism is in contact with the surface of the liquid cooling plate.

[0010] In the above process, the battery cell assembly is arranged on the liquid cooling plate. The heat conduction mechanism is attached to the surface of the battery cell body and the surface of the liquid cooling plate respectively, which can ensure heat transfer between the convex flow channel and the battery cell and improve the heat conduction efficiency between the battery cell assembly and the liquid cooling plate.

[0011] Furthermore, the heat conduction mechanism is provided with a plurality of protruding locking members. One side of the protruding locking member is fitted into the groove of the liquid cooling plate, and the other side of the protruding locking member is provided with a locking groove, and the flange edge is nested in the locking groove.

[0012] In the above process, multiple protruding locking components are arranged in an array to fit the liquid cooling plate and achieve close contact; the heat conduction mechanism has a slot on its plane, which fits the flange edge of the battery cell and locks the flange edge.

[0013] Furthermore, the planar width of the convex flow channel is less than or equal to the side width of the cell body, and the planar width of the convex flow channel is greater than or equal to half of the side width of the cell body.

[0014] In the above implementation process, the contact area between the side of the battery cell and the convex flow channel is ensured to guarantee the thermal conductivity between the battery cell and the liquid cooling plate.

[0015] Furthermore, the thermally conductive mechanism is one of thermally conductive structural adhesive, thermally conductive gel, or thermally conductive pad.

[0016] Furthermore, the battery device also includes a first sealing gasket disposed between the upper cover and the battery pack frame.

[0017] In the above implementation process, to ensure the sealing function requirements, a first sealing gasket is provided between the top cover and the battery pack frame.

[0018] Furthermore, the battery device also includes a second sealing gasket disposed between the battery pack frame and the liquid cooling plate.

[0019] In the above implementation process, the second sealing gasket ensures the sealing performance of the liquid cooling plate and the battery pack frame after assembly.

[0020] Furthermore, the battery device also includes an insulation and heat insulation mechanism disposed between the upper cover and the battery pack.

[0021] In the above implementation process, an insulating and heat-insulating mechanism is used to separate the top cover and the battery pack to ensure the safety of the battery pack.

[0022] Furthermore, the insulation and heat insulation mechanism is heat-insulating and heat-insulating foam.

[0023] Secondly, embodiments of this application provide an electric vehicle, the electric vehicle including the battery device described in any of the first aspects.

[0024] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0025] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0028] Figure 2 A schematic diagram of the side structure of a battery cell provided in an embodiment of this application;

[0029] Figure 3 This is an exploded structural diagram of the battery device provided in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of this application;

[0031] Figure 5 A top view of the liquid cooling plate provided in an embodiment of this application;

[0032] Figure 6 This is a schematic diagram of the assembly structure of the liquid cooling plate and the battery cell assembly provided in the embodiments of this application;

[0033] Figure 7 This is a schematic cross-sectional view of the assembly structure of the liquid cooling plate and the battery cell assembly provided in an embodiment of this application.

[0034] Figure 8This is a schematic diagram of the heat conduction mechanism provided in the embodiments of this application;

[0035] Figure 9 This is a partial structural schematic diagram of the heat conduction mechanism provided in an embodiment of this application;

[0036] Figure 10 This is a schematic diagram of the assembly structure of the battery pack, heat conduction mechanism, and liquid cooling plate provided in the embodiments of this application.

[0037] Icons: Top cover 100; Cell assembly 200; Cell 210; Cell body 211; Flange edge 212; Battery pack frame 300; Liquid cooling plate 400; Convex flow channel 410; Groove 420; Inlet 430; Outlet 440; Heat conduction mechanism 500; Protruding locking piece 510; Slot 511; First sealing gasket 610; Second sealing gasket 620; Insulation and heat insulation mechanism 700. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0040] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0041] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0042] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0043] This application provides a battery device and an electric vehicle that can be applied to battery cell packs with flanges. The battery device has flanges on the cells, which facilitate welding the cells together. However, the flanges themselves can affect the thermal management performance of the cells. By using a liquid cooling plate with convex flow channels, the convex flow channels are positioned opposite to the side of the cell body, ensuring that the liquid cooling plate is as close as possible to or in contact with the side of the cell body, thus achieving a cooling effect. Furthermore, the groove formed between the two convex flow channels of the liquid cooling plate provides space for the flanges of the cells and also serves to limit their movement during assembly. Therefore, this battery device can improve the thermal management performance of battery cells with flanges.

[0044] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application. Figure 2 This is a side view of the battery cell provided in an embodiment of this application; the battery cell 210 includes a battery cell body 211 and a flange edge 212.

[0045] For example, the battery cell 210 can be a rectangular battery cell; in this battery cell 210, a flange edge 212 is provided around the battery cell body 211, that is, the flange edge 212 protrudes from the battery cell body 211; in the prior art, the presence of the flange edge 212 can facilitate the welding of the battery cell into one piece. However, because of the presence of the flange edge 212, when the battery cell 210 contacts the liquid cooling plate 400, it contacts the flange edge 212 first, causing the large surface of the battery cell body 211 to be unable to contact the liquid cooling plate 400, thereby seriously affecting the heat dissipation efficiency of the battery cell body 211, ultimately resulting in poor thermal management effect.

[0046] Please see Figure 3 , Figure 3This is an exploded structural diagram of a battery device provided in an embodiment of this application. The battery device includes a top cover plate 100, a cell assembly 200, a battery pack frame 300, and a liquid cooling plate 400.

[0047] For example, the top cover 100 and the battery pack frame 300 are fitted together, and the cell assembly 200 is installed inside the battery pack frame 300.

[0048] In some embodiments, the top cover 100 is bolted to the battery pack frame 300.

[0049] For example, the battery cell assembly 200 includes a plurality of battery cells 210 mounted side by side. Each battery cell 210 includes a battery cell body 211 and a flange edge 212. The battery cell body 211 and the flange edge 212 are fitted together and the flange edge 212 protrudes from the battery cell body 211.

[0050] For example, the liquid cooling plate 400 includes a plurality of convex flow channels 410, and two adjacent convex flow channels 410 are provided with a groove 420. The convex flow channels 410 are disposed opposite to the side of the cell body 211, and the flange edge 212 is installed in the groove 420.

[0051] For example, the liquid cooling plate 400 is mounted on the battery pack frame 300.

[0052] Optionally, the liquid cooling plate 400 can be formed by stamping and brazing, and the assembly process of the liquid cooling plate 400 and the battery pack frame 300 is FSD self-tapping bolt connection.

[0053] Optionally, the liquid cooling plate 400 can be made by extrusion molding, and the assembly process of the liquid cooling plate 400 and the battery pack frame 300 can be friction stir welding or screwing.

[0054] In some embodiments, by providing a liquid cooling plate 400 with convex flow channels 410, and the convex flow channels 410 being arranged opposite to the side of the cell body 211, it can be ensured that the liquid cooling plate 400 is as close as possible to or in contact with the side of the cell body 211, thereby achieving a cooling effect. In addition, the groove 420 formed between the two convex flow channels 410 of the liquid cooling plate 400 can provide arrangement space for the flange edge 212 of the cell 210, and can also play a role in limiting the position of the cell 210 during assembly. Thus, the battery device can improve the thermal management effect of the cell with flange edge.

[0055] Please see Figures 4 to 7 , Figure 4 This is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of this application. Figure 5 This is a top view of the liquid cooling plate provided in an embodiment of this application. Figure 6This is a schematic diagram of the assembly structure of the liquid cooling plate and the battery cell assembly provided in an embodiment of this application. Figure 7 This is a cross-sectional schematic diagram of the assembly structure of the liquid cooling plate and the battery cell assembly provided in the embodiments of this application.

[0056] For example, the flow channel of the liquid cooling plate 400 is convex, i.e., a convex flow channel 410; the liquid inside the convex flow channel 410 flows into the liquid cooling plate 400 through the inlet 430 and flows out through the outlet 440 of the liquid cooling plate 400, and its liquid flow direction is as follows. Figure 5 As shown; it should be noted that, Figure 5 Due to the dense flow channels and space limitations, the flow direction of the convex flow channel 410 is not fully indicated.

[0057] For example, the surface of the convex flow channel 410 is disposed opposite to the side of the cell body 211, that is, the surface of the convex flow channel 410 is close to the side of the cell body 211.

[0058] For example, a groove 420 is located between the two convex flow channels 410 of the liquid cooling plate 400. This groove can hold the flange edge 212 of the battery cell 210, providing space for the flange edge 212 and also serving as a positioning / holding function for the battery cell assembly 200 during assembly. In this application, the flange edge 212 of each battery cell 210 in the battery cell assembly 200 is held between the two convex flow channels 410 of the liquid cooling plate 400, that is, between the grooves 420. Figure 6 As shown.

[0059] Please see Figures 8 to 10 , Figure 8 This is a schematic diagram of the heat conduction mechanism provided in the embodiments of this application. Figure 9 This is a partial structural schematic diagram of the heat conduction mechanism provided in an embodiment of this application. Figure 8 and Figure 9 Correspondingly; Figure 10 This is a schematic diagram of the assembly structure of the battery pack, heat conduction mechanism, and liquid cooling plate provided in the embodiments of this application.

[0060] For example, the battery device also includes a heat conduction mechanism 500 disposed between the cell assembly 200 and the liquid cooling plate 400. The shape of the heat conduction mechanism 500 matches the shape of the liquid cooling plate 400, wherein one side surface of the heat conduction mechanism 500 is in contact with the surface of the cell body 211, and the other side surface of the heat conduction mechanism 500 is in contact with the surface of the liquid cooling plate 400.

[0061] For example, the battery cell assembly 200 is arranged on the liquid cooling plate 400. The heat conduction mechanism 500 is attached to the surface of the battery cell body 211 and the surface of the liquid cooling plate 400 respectively, which can ensure heat transfer between the convex flow channel 410 and the battery cell 210 and improve the heat conduction efficiency between the battery cell assembly 200 and the liquid cooling plate 400.

[0062] For example, such as Figure 8 As shown, the upper surface of the heat conduction mechanism 500 is a plane and contacts the side of the battery cell body 211; the lower surface of the heat conduction mechanism 500 is adapted to the surface shape of the liquid cooling plate 400 (i.e., the lower surface of the heat conduction mechanism 500 is in an array of protrusions and is adapted to the liquid cooling plate 400), so as to achieve the contact between the lower surface of the heat conduction mechanism 500 and the surface of the liquid cooling plate 400.

[0063] For example, the heat conduction mechanism 500 is provided with a plurality of protruding locking members 510. One side of the protruding locking member 510 is fitted into the groove of the liquid cooling plate, and the other side of the protruding locking member 510 is provided with a slot 511, and the flange edge 212 is nested in the slot 511.

[0064] For example, multiple protruding locking components are arranged in an array to fit the liquid cooling plate 400 and achieve close contact; the heat conduction mechanism 500 has a slot 511 on its plane, which fits the flange edge 212 of the battery cell 210 and locks the flange edge 212.

[0065] For example, the planar width of the convex flow channel 410 is less than or equal to the side width of the cell body 211, and the planar width of the convex flow channel 410 is greater than or equal to half of the side width of the cell body 211.

[0066] For example, in the embodiments of this application, the side of the battery cell 210 is a plane, so the surface of the convex flow channel 410 in the liquid cooling plate 400 is also a plane, and 1 / 2 of the width of the side of the battery cell is less than or equal to the width of the plane protruding from the convex flow channel and less than or equal to the width of the side of the battery cell, so as to ensure the contact area between the side of the battery cell 210 and the convex flow channel 410, so as to ensure the thermal conductivity between the battery cell 210 and the liquid cooling plate 400.

[0067] For example, the thermally conductive mechanism is one of thermally conductive structural adhesive, thermally conductive gel, or thermally conductive pad.

[0068] For example, the space between the battery cell 210 and the liquid cooling plate 400 needs to be filled with thermally conductive structural adhesive, thermally conductive gel or thermally conductive pad, so as to ensure heat transfer between the convex flow channel 410 and the battery cell 210.

[0069] For example, the battery device also includes a first sealing gasket 610 disposed between the upper cover 100 and the battery pack frame 300.

[0070] For example, in order to ensure the IPXX sealing function requirement, a first sealing gasket 610 is provided between the top cover 100 and the battery pack frame 300.

[0071] For example, the battery device also includes a second sealing gasket 620 disposed between the battery pack frame 300 and the liquid cooling plate 400.

[0072] For example, the second sealing gasket 620 ensures the sealing of the liquid cooling plate 400 after it is assembled with the battery pack frame 300.

[0073] For example, the battery device also includes an insulation and heat insulation mechanism 700 disposed between the upper cover 100 and the battery pack 200.

[0074] For example, an insulating and heat-insulating mechanism 700 is used to separate the upper cover 100 and the battery pack 200 to ensure the safety of the battery pack 200.

[0075] For example, the insulation and heat insulation mechanism 700 is a heat-insulating and heat-insulating foam.

[0076] This application embodiment also provides an electric vehicle, the electric vehicle including... Figures 1 to 10 The battery device shown in any of the examples.

[0077] For example, in the battery device provided in this application embodiment, the flange edge 212 of the battery cell 210 determines that a conventional liquid cooling plate 400 cannot be used. Considering the structural characteristics of the battery cell 210, a convex flow channel 410 is designed and faces the liquid cooling plate 400 towards the side of the battery cell 210. This ensures that the liquid cooling plate 400 is as close as possible to or in contact with the side of the battery cell 210, thereby achieving a cooling effect. The groove 420 formed between two adjacent convex flow channels in the liquid cooling plate 400 provides space for the flange edge 212 of the battery cell 210 and also serves to limit the position of the battery cell 210 during assembly. Furthermore, a heat-conducting mechanism 500 is filled between the liquid cooling plate 400 and the battery cell 210, serving two purposes: firstly, to fix the battery cell 210 and ensure its strength; and secondly, to maximize the heat conduction between the battery cell 210 and the liquid cooling plate 400.

[0078] In all embodiments of this application, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.

[0079] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0080] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0081] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A battery device, characterized in that, This includes the top cover, cell assembly, battery pack frame, and liquid cooling plate; The upper cover plate and the battery pack frame are matched and installed, and the battery cell assembly is installed inside the battery pack frame. The battery cell assembly includes multiple battery cells installed side by side. Each battery cell includes a battery cell body and a flange edge. The battery cell body and the flange edge are matched and installed, and the flange edge protrudes from the battery cell body. The liquid cooling plate includes multiple convex flow channels, and two adjacent convex flow channels are provided with a groove. The convex flow channels are arranged opposite to the side of the battery cell body, and the flange edge is installed in the groove. The battery device further includes a heat-conducting mechanism disposed between the battery cell assembly and the liquid cooling plate. The shape of the heat-conducting mechanism matches the shape of the liquid cooling plate. One side surface of the heat-conducting mechanism is in contact with the surface of the battery cell body, and the other side surface of the heat-conducting mechanism is in contact with the surface of the liquid cooling plate. The heat conduction mechanism is provided with multiple protruding locking parts. One side of the protruding locking part is fitted into the groove of the liquid cooling plate, and the other side of the protruding locking part is provided with a locking groove. The flange edge is nested in the locking groove.

2. The battery device according to claim 1, characterized in that, The thermally conductive mechanism is one of thermally conductive structural adhesive, thermally conductive gel, or thermally conductive pad.

3. The battery device according to claim 1, characterized in that, The planar width of the convex flow channel is less than or equal to the side width of the cell body, and the planar width of the convex flow channel is greater than or equal to half of the side width of the cell body.

4. The battery device according to claim 1, characterized in that, The battery device also includes a first sealing gasket disposed between the upper cover and the battery pack frame.

5. The battery device according to claim 4, characterized in that, The battery device further includes a second sealing gasket disposed between the battery pack frame and the liquid cooling plate.

6. The battery device according to claim 1, characterized in that, The battery device also includes an insulation and heat insulation mechanism disposed between the upper cover plate and the battery cell assembly.

7. The battery device according to claim 6, characterized in that, The insulation and heat insulation mechanism is heat-insulating and heat-insulating foam.

8. An electric vehicle, characterized in that, The electric vehicle includes the battery device as described in any one of claims 1 to 7.

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