Battery pack upper cover, battery pack and vehicle

Abstract

This invention provides a battery pack cover, a battery pack, and a vehicle, relating to the field of vehicle battery technology. It addresses the technical problem in existing technologies where design goals conflict between cooling and electromagnetic shielding structures, making it difficult to balance their effects. The invention includes an electromagnetic shielding layer, a thermal management layer, and a selective grounding layer arranged sequentially. The selective grounding layer includes a selective grounding layer substrate with multiple connecting protrusions arrayed on it. Conductive portions are formed on the connecting protrusions. When the battery pack cover is connected to the battery module, the conductive portions form pressure contact with a preset grounding point on the battery module's grounding copper busbar. This invention reduces the contact area between the electromagnetic shielding layer and the conductor while meeting thermal management requirements, overcoming the design goal conflict between the cooling and electromagnetic shielding structures, and simultaneously satisfying the vehicle battery's needs for thermal management and electromagnetic shielding.

Description

Technical Field

[0001] This utility model relates to the field of vehicle battery technology, specifically to a battery pack cover, a battery pack, and a vehicle. Background Technology

[0002] To ensure the safe and stable operation of the vehicle, and to reduce the impact of heat and electromagnetic interference on the vehicle battery, thermal management and electromagnetic shielding of the vehicle battery are required.

[0003] In the process of thermal management and electromagnetic shielding of vehicle batteries, a mechanical stacking of cooling and electromagnetic shielding structures is usually adopted; however, there is a conflict between the design objectives of the cooling structure and the electromagnetic shielding structure, and it is difficult to balance their effects. Utility Model Content

[0004] The purpose of this utility model is to provide a battery pack cover, a battery pack, and a vehicle to improve the technical problem in the prior art where there is a conflict between the design objectives of the cooling structure and the electromagnetic shielding structure, and the effects of the two are difficult to balance.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a battery pack cover, suitable for connection with a battery module, comprising: An electromagnetic shielding layer, a thermal management layer, and a selective grounding layer are sequentially arranged along the first direction; The selective grounding layer includes a selective grounding layer substrate, on the side of the selective grounding layer substrate away from the thermal management layer having an array of connecting protrusions, and a conductive portion being formed at the end of the connecting protrusions away from the selective grounding layer substrate. When the battery pack cover is connected to the battery module, the conductive part forms a pressure contact with the preset grounding point of the grounding copper busbar of the battery module.

[0006] In an optional embodiment, the electromagnetic shielding layer includes an electromagnetic shielding layer substrate, on which a plurality of electromagnetic shielding holes are arrayed. The wall of the electromagnetic shielding hole is inclined along a first direction, and the inclination direction of the wall of adjacent electromagnetic shielding holes in the second direction is opposite. The second direction is perpendicular to the first direction.

[0007] In an optional embodiment, the angle between the wall of the electromagnetic shielding hole and the first direction is... ,

[0008] The spacing between adjacent electromagnetic shielding holes is m ,

[0009] The distance between the electromagnetic shielding hole located on the outer edge and the edge of the electromagnetic shielding layer substrate is , .

[0010] In an optional embodiment, the thermal management layer includes a thermal management layer substrate and cooling channels formed on the thermal management layer substrate; a heat exchange channel is provided outside the cooling channel, and the heat exchange channel is filled with a phase change material.

[0011] In an optional embodiment, the width of the cooling channel is d , The depth of the cooling channel in the first direction is D , .

[0012] In an optional embodiment, a mechanical buffer channel is provided on the side of the cooling channel away from the electromagnetic shielding layer in the first direction; a mechanical buffer material is embedded in the mechanical buffer channel.

[0013] In an optional embodiment, the connecting protrusion is a tapered protrusion, and the height of the connecting protrusion in the first direction is [missing information]. , The bottom diameter of the connecting protrusion is r , The cone angle of the connecting protrusion is θ , .

[0014] In an optional embodiment, the projection of the center portion of the connecting protrusion onto the electromagnetic shielding layer substrate coincides with the center portion of the corresponding electromagnetic shielding hole.

[0015] Secondly, the present invention provides a battery pack, including the battery pack cover described in any of the foregoing embodiments.

[0016] Thirdly, the present invention provides a vehicle, including a battery pack cover as described in any of the foregoing embodiments or a battery pack as described in the foregoing embodiments.

[0017] The beneficial effects of the battery pack cover, battery pack, and vehicle provided by this embodiment of the utility model include: This utility model provides a battery pack cover, a battery pack with the battery pack cover, and a vehicle. The battery pack cover includes an electromagnetic shielding layer, a thermal management layer, and a selective grounding layer arranged sequentially. The selective grounding layer includes a selective grounding layer substrate with multiple connecting protrusions arrayed on the substrate. Conductive portions are formed on the connecting protrusions. When the battery pack cover is connected to the battery module, the conductive portions form pressure contact with a preset grounding point of the grounding copper busbar of the battery module. The selective grounding layer allows battery heat to be transferred to the thermal management layer, achieving thermal management of the battery. On the other hand, low-frequency interference can be guided to the grounding copper busbar through the conductive portions of the connecting protrusions for discharge. Due to the presence of the connecting protrusions, the requirement of reducing the conductor contact area of ​​the electromagnetic shielding layer to reduce the risk of short circuits can be met. Thus, while meeting the thermal management requirements, the contact area between the electromagnetic shielding layer and the conductor is minimized, overcoming the design conflict between the cooling structure and the electromagnetic shielding structure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the battery pack cover provided in this embodiment from a first-view perspective; Figure 2 This is a schematic diagram of the electromagnetic shielding layer in the battery pack cover provided in this embodiment from a second perspective. Figure 3 This is a schematic diagram of the arrangement of electromagnetic shielding holes in the battery pack cover provided in this embodiment; Figure 4 This is a cross-sectional view of the thermal management layer in the battery pack cover provided in this embodiment from a first perspective. Figure 5 This is a schematic diagram of the selective grounding layer in the battery pack cover provided in this embodiment from a second perspective. Figure 6 This is a schematic diagram showing the correspondence between the electromagnetic shielding hole and the connecting protrusion in the battery pack cover provided in this embodiment. Figure 1 ; Figure 7 This is a schematic diagram showing the correspondence between the electromagnetic shielding hole and the connecting protrusion in the battery pack cover provided in this embodiment. Figure 2 ; Figure 8This is a schematic diagram showing the correspondence between the electromagnetic shielding hole and the connecting protrusion in the battery pack cover provided in this embodiment. Figure 3 .

[0020] Icons: 100 - Electromagnetic shielding layer; 110 - Electromagnetic shielding layer substrate; 111 - Electromagnetic shielding hole; 200 - Thermal management layer; 210 - Thermal management layer substrate; 220 - Cooling channel; 230 - Heat exchange channel; 240 - Mechanical buffer channel; 300 - Selective grounding layer; 310 - Selective grounding layer substrate; 320 - Connecting protrusion; 321 - Conductive part. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] The battery pack cover mentioned in this utility model is suitable for connection with the battery module and can be connected with other structural components (such as the top shell of the battery pack, the bottom shell of the battery pack, etc.) to form a complete battery pack. The battery pack mentioned in this utility model refers to the upper-level integrated unit of the battery module. Specifically, the battery module is a small component formed by connecting multiple cells in series and parallel according to specific rules, plus fixing, protection and connecting parts. The battery pack is a complete energy unit that can be directly installed in a vehicle after integrating one or more battery modules with thermal management, electronic control, shell and other systems.

[0028] To simultaneously reduce the impact of heat and electromagnetic interference on vehicle batteries, thermal management and electromagnetic shielding of vehicle batteries are required.

[0029] In existing technologies, cooling structures and electromagnetic shielding structures are usually mechanically stacked. However, there are certain functional conflicts in the design of stacking cooling structures and electromagnetic shielding structures. For example, in order to improve heat exchange efficiency, the cooling structure needs to maximize the contact area with the battery module, while the electromagnetic shielding structure needs to minimize the contact area with the conductor to reduce the risk of short circuit. Therefore, it is difficult to balance the effects of the two.

[0030] The following detailed description of the overall structure, working principle, and technical effects of the battery pack cover, battery pack, and vehicle provided by this utility model, through embodiments and in conjunction with the accompanying drawings, is a practical example.

[0031] Please see Figure 1 The battery pack cover provided in this embodiment includes an electromagnetic shielding layer 100, a thermal management layer 200, and a selective grounding layer 300 stacked sequentially along a first direction. The selective grounding layer 300 includes a selective grounding layer substrate 310. A plurality of connecting protrusions 320 are arrayed on the side of the selective grounding layer substrate 310 away from the thermal management layer 200. A conductive portion 321 is formed at one end of the connecting protrusion 320 away from the selective grounding layer substrate 310. When the battery pack cover is connected to the battery module, the conductive portion 321 forms a pressure contact with the preset grounding point of the grounding copper busbar of the battery module.

[0032] This embodiment provides a battery pack cover that allows battery heat to be transferred to the thermal management layer 200 via the selective grounding layer 300, achieving battery thermal management. Furthermore, low-frequency interference can be conducted out via the conductive portion 321 of the connecting protrusion 320 to the grounding copper busbar, achieving a certain electromagnetic shielding effect. The presence of the connecting protrusion 320 satisfies both the requirement of reducing the conductor contact area of ​​the electromagnetic shielding layer 100 to lower the risk of short circuits and the battery's thermal management needs. By minimizing the contact area between the electromagnetic shielding layer 100 and the conductor while meeting thermal management requirements, the design conflict between the cooling structure and the electromagnetic shielding structure is overcome.

[0033] Please continue reading. Figure 1 In this embodiment, the electromagnetic shielding layer 100, the thermal management layer 200, and the selective grounding layer 300 are stacked to form a composite layer structure. The thickness of the electromagnetic shielding layer 100 in the first direction can be 0.1mm-0.2mm, the thickness of the thermal management layer 200 in the first direction can be 0.4mm-0.8mm, and the thickness of the selective grounding layer 300 in the first direction can be 0.1mm-0.2mm. Accordingly, the above arrangement makes the electromagnetic shielding layer 100, the thermal management layer 200, and the selective grounding layer 300 present a composite layer structure with a thickness of 0.6mm-1.2mm in the first direction.

[0034] Specifically, the electromagnetic shielding layer 100, the thermal management layer 200, and the selective grounding layer 300 can be metallurgically bonded by hot pressing. Please see Figure 2 In this embodiment, the electromagnetic shielding layer 100 includes an electromagnetic shielding layer substrate 110 made of high-purity aluminum foil, and a plurality of electromagnetic shielding holes 111 are arrayed on the electromagnetic shielding layer substrate 110.

[0035] Please see Figure 3 Specifically, the electromagnetic shielding hole 111 is a hexagonal hole, and the hole wall of the electromagnetic shielding hole 111 is inclined in the first direction so that the electromagnetic shielding hole 111 presents a frustum structure in space.

[0036] In this embodiment, the electromagnetic shielding hole 111 is a hexagonal hole. On the one hand, it can serve as a weight reduction design, reducing the weight of the battery pack cover and improving the energy efficiency gain for the vehicle's range. On the other hand, in order to enhance the electromagnetic shielding effect, when high-frequency electromagnetic waves penetrate the electromagnetic shielding hole 111, the hole wall tilt angle can induce wave phase distortion, thereby increasing energy scattering and dissipation. In this embodiment, the tilt directions of the hole walls of adjacent electromagnetic shielding holes 111 in the second direction are opposite (that is, the hole wall tilt angles of adjacent electromagnetic shielding holes 111 are arranged alternately at 180°).

[0037] In some embodiments, the plurality of electromagnetic shielding holes 111 can be arranged in a Halbach array to cause the incident electromagnetic waves to undergo directional destructive interference in the hole array, thereby improving the shielding effectiveness in the high-frequency band and ensuring the signal stability of the high-voltage battery system.

[0038] Specifically, the Halbach array uses directional arrangement of magnetic poles to enhance the magnetic field strength on one side and weaken it on the other. This invention achieves control over the direction of electromagnetic wave propagation by directional arrangement of the aperture walls' tilt angles. Its core lies in utilizing the principle of destructive interference: when an electromagnetic wave penetrates the aperture array, aperture walls with different tilt angles induce a phase difference in the reflected wave. By alternating 180° tilt angles between adjacent rows of aperture walls, destructive interference occurs on the outside of the shielding layer, significantly dissipating energy. When a high-frequency incident electromagnetic wave encounters a positively tilted aperture wall, the reflected wave phase shifts by + The adjacent negative tilt angle aperture walls cause a phase shift in the reflected wave. In the space outside the shielding layer, the two reflected waves form destructive interference, and their energy cancels each other out, which enhances energy dissipation and improves shielding effectiveness.

[0039] In some embodiments, the angle between the wall of the electromagnetic shielding hole 111 and the first direction is . , The spacing between adjacent electromagnetic shielding holes 111 is m , The distance between the electromagnetic shielding hole 111 located on the outer edge and the edge of the electromagnetic shielding layer substrate 110 is , .

[0040] In one specific embodiment, the angle between the wall of the electromagnetic shielding hole 111 and the first direction is... , The spacing between adjacent electromagnetic shielding holes 111 is m , The distance between the electromagnetic shielding hole 111 located on the outer edge and the edge of the electromagnetic shielding layer substrate 110 is , .

[0041] Please see Figure 4 In this embodiment, the thermal management layer 200 includes a thermal management layer substrate 210 made of aluminum foil and cooling channels 220 formed on the thermal management layer substrate 210.

[0042] In this embodiment, the cooling channel 220 is a copper or aluminum tube with a wall thickness of 0.1 mm. The cooling channel 220 contains a cooling medium for heat exchange. It is understood that the two ends of the cooling channel 220 should be provided with an inlet and an outlet for the cooling medium to flow in and out.

[0043] In some embodiments, the cooling channel 220 can be any one of a serpentine channel, a straight channel, or a branched channel. The form in which the cooling channel 220 is opened can be selected according to actual working needs and is not limited here.

[0044] In one specific embodiment, the cooling channel 220 is a serpentine channel and covers the thermal management layer substrate 210 as much as possible. The width of the cooling channel 220 is... d , The depth of the cooling channel 220 in the first direction is D , .

[0045] Please continue reading. Figure 4 A heat exchange channel 230 is provided on the outside of the cooling channel 220. The heat exchange channel 230 is filled with a phase change material. The phase change material can absorb peak heat during the battery fast charging, thereby reducing the cell temperature rise rate.

[0046] In one specific embodiment, the phase change material can be a paraffin / graphene composite phase change material.

[0047] In order to improve the mechanical protection capability of the battery pack, in this embodiment, a mechanical buffer channel 240 is provided on the side of the cooling channel 220 away from the electromagnetic shielding layer 100 in the first direction; a mechanical buffer material is embedded in the mechanical buffer channel 240, which can disperse the external impact force received by the battery pack.

[0048] In one specific embodiment, the mechanical cushioning material is an aramid fiber woven mesh, which is 45° twill woven with a single filament diameter of 15-25μm and a mesh count of 100-150.

[0049] In several other embodiments, the mechanical cushioning material may also be other reinforcing materials such as glass fiber / basalt fiber.

[0050] Please see Figure 5 The connection protrusion 320 on the selective grounding layer substrate 310 is a tapered Al2O3 insulating protrusion, and a 1μm-3μm thick silver coating is sputtered onto the top of the protrusion as a conductive part 321; in this embodiment, the height of the connection protrusion 320 in the first direction is , The bottom diameter of the connecting protrusion 320 is r , The cone angle of the connecting protrusion 320 is... θ , .

[0051] In one specific embodiment, the height of the connecting protrusion 320 in the first direction is , The bottom diameter of the connecting protrusion 320 is r , The cone angle of the connecting protrusion 320 is... θ ,

[0052] Please see Figures 6 to 8 In order to further improve the electromagnetic shielding effect, in this embodiment, the projection of the center part of the connecting protrusion 320 on the electromagnetic shielding layer substrate 110 coincides with the center part of the corresponding electromagnetic shielding hole 111, so that low frequency interference can be guided out through the conductive part 321 to the grounding copper busbar.

[0053] The electromagnetic shielding process of the battery pack cover provided in this embodiment is as follows: A. When high-frequency electromagnetic waves penetrate electromagnetic shielding hole 111, the tilt angle of the hole wall of electromagnetic shielding hole 111 causes wave phase distortion and energy scattering and dissipation. B. Low-frequency interference is guided out through the conductive part 321 of the connecting protrusion 320 to the preset grounding copper busbar of the battery module.

[0054] The thermal management process of the battery pack cover provided in this embodiment is as follows: A. The heat generated by the battery is conducted to the selective grounding layer 300, and then transferred from the selective grounding layer 300 to the thermal management layer 200. Finally, the phase change material in the heat exchange channel 230 melts and absorbs the heat. B. The cooling medium circulates within the cooling channel 220 to remove heat, maintaining a cell temperature difference of ≤±2℃.

[0055] The mechanical protection process of the battery pack cover provided in this embodiment is as follows: A. External impact force is dispersed by the mechanical buffer material within the mechanical buffer channel 240; B. The electromagnetic shielding holes 111 on the electromagnetic shielding layer 100 have a folded structure that absorbs energy, while the insulating connection protrusions 320 of the selective grounding layer 300 can maintain an intact insulating barrier.

[0056] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pack cover, characterized in that, Suitable for connection to battery modules, including: An electromagnetic shielding layer (100), a thermal management layer (200), and a selective grounding layer (300) are sequentially arranged along the first direction. The selective ground layer (300) includes a selective ground layer substrate (310), and a plurality of connecting protrusions (320) are arranged in an array on the side of the selective ground layer substrate (310) away from the thermal management layer (200). A conductive portion (321) is formed at the end of the connecting protrusions (320) away from the selective ground layer substrate (310). When the battery pack cover is connected to the battery module, the conductive part (321) forms a pressure contact with the preset grounding point of the grounding copper busbar of the battery module.

2. The battery pack cover according to claim 1, characterized in that, The electromagnetic shielding layer (100) includes an electromagnetic shielding layer substrate (110), on which a plurality of electromagnetic shielding holes (111) are arrayed. The wall of the electromagnetic shielding hole (111) is inclined along the first direction, and the inclination direction of the wall of the adjacent electromagnetic shielding holes (111) in the second direction is opposite. The second direction is perpendicular to the first direction.

3. The battery pack cover according to claim 2, characterized in that, The angle between the wall of the electromagnetic shielding hole (111) and the first direction is... , The spacing between adjacent electromagnetic shielding holes (111) is m , The distance between the electromagnetic shielding hole (111) located on the outer edge and the edge of the electromagnetic shielding layer substrate (110) is , .

4. The battery pack cover according to claim 1, characterized in that, The thermal management layer (200) includes a thermal management layer substrate (210) and a cooling channel (220) formed on the thermal management layer substrate (210); a heat exchange channel (230) is provided on the outside of the cooling channel (220), and the heat exchange channel (230) is filled with a phase change material.

5. The battery pack cover according to claim 4, characterized in that, The width of the cooling channel (220) is d , The depth of the cooling channel (220) in the first direction is D , .

6. The battery pack cover according to claim 4, characterized in that, The cooling channel (220) has a mechanical buffer channel (240) on the side away from the electromagnetic shielding layer (100) in the first direction; mechanical buffer material is embedded in the mechanical buffer channel (240).

7. The battery pack cover according to claim 1, characterized in that, The connecting protrusion (320) is a tapered protrusion, and the height of the connecting protrusion (320) in the first direction is... , The bottom diameter of the connecting protrusion (320) is r , The cone angle of the connecting protrusion (320) is θ , .

8. The battery pack cover according to claim 2, characterized in that, The projection of the center of the connecting protrusion (320) onto the electromagnetic shielding substrate (110) coincides with the center of the corresponding electromagnetic shielding hole (111).

9. A battery pack, characterized in that, Includes the battery pack cover as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the battery pack cover as described in any one of claims 1-8 or the battery pack as described in claim 9.

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