Upper cover assembly of battery pack, battery pack and new energy vehicle

Abstract

The utility model aims at providing an upper cover assembly of a battery pack, the battery pack and a new energy vehicle, the battery pack is installed on the new energy vehicle, and the upper cover assembly of the battery pack comprises a cover plate, a supporting part and a damping pad; the cover plate is provided with an integrally-formed side wall part in the circumferential direction, reinforcing ribs are arranged on the surface of the cover plate and the side wall part respectively, and the damping pad is arranged on the upper end face of the cover plate. The supporting part is of a hollow structure and is welded to the upper end face of the cover plate, and the supporting part is fixed to a vehicle body framework of the new energy vehicle through a fastener. The maintenance cost of the battery pack is reduced while the structural strength, the NVH performance and the treading performance of the upper cover assembly of the battery pack are guaranteed.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an upper cover assembly of a battery pack, a battery pack and a new energy vehicle. Background Art

[0002] New energy vehicles have developed rapidly in recent years, and the driving range has always been a technical difficulty in the field of new energy vehicles. The upper cover of the battery pack is formed into the body floor. This fusion saves the Z-direction space of the battery pack and the traditional body floor, effectively improves the volume utilization of the battery system, increases the installation space of the battery pack in a limited space, improves the driving range, and improves the Z-direction space of the passenger compartment.

[0003] The upper cover of the battery pack forms the vehicle body floor. To ensure the structural strength, NVH (Noise, Vibration, Harshness) performance and pedal performance of the upper cover of the battery pack, the entire battery pack is usually sealed and cured with glue. With this arrangement, when the battery pack fails, the entire battery pack needs to be replaced, and the maintenance cost is high.

[0004] Therefore, how to ensure the structural strength, NVH performance, and pedaling performance of the upper cover assembly of the battery pack while reducing the maintenance cost of the battery pack is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The purpose of the present application is to provide a battery pack upper cover assembly, a battery pack and a new energy vehicle, which can reduce the maintenance cost of the battery pack while ensuring the structural strength, NVH performance and pedaling performance of the battery pack upper cover assembly.

[0006] In order to solve the above-mentioned technical problems, the present application provides an upper cover assembly of a battery pack, which is installed in a new energy vehicle. The upper cover assembly of the battery pack includes a cover plate, a support portion and a damping pad; the cover plate is provided with an integrally formed side wall portion along the circumferential direction, and the surface of the cover plate and the side wall portion are respectively provided with reinforcing ribs, and the damping pad is arranged on the upper end surface of the cover plate; the support portion is a hollow structure and is welded to the upper end surface of the cover plate, and the support portion is fixed to the body frame of the new energy vehicle by fasteners.

[0007] The surface of the cover plate and the surface of the side wall are respectively provided with reinforcing ribs. The cover plate and the side wall can be respectively provided with a plurality of reinforcing ribs of different shapes to ensure the overall structural strength of the upper cover assembly. The support portion is a hollow structure, which is fixed to the upper end surface of the cover plate and can be fixed to the vehicle body frame by fasteners. The setting of the support portion can facilitate the disassembly and assembly operations between the cover plate and the vehicle body frame. At the same time, the support portion can also enhance the overall structural strength of the upper cover assembly.

[0008] Due to the arrangement of the reinforcing ribs and the supporting parts, the overall structural strength of the upper cover assembly can be ensured, and there is no need to guarantee the structural strength of the upper cover assembly by filling glue into the battery pack. The upper cover assembly and the lower box body can be detachably connected, for example, fixed by fasteners, and then the supporting part is fixed to the vehicle body frame through the fasteners. At this time, when a failure occurs in the battery pack, it is convenient to detach the whole battery pack, then separate the upper cover assembly from the lower box body as a whole, and after repairing the failure in the battery pack, reinstall it on the vehicle body frame, and the operation is relatively convenient.

[0009] The damping pad is laid on the upper end face of the cover plate, which can improve the comfort of stepping on the upper end face of the battery pack, and due to the arrangement of the damping pad, it can also ensure the NVH performance such as the shock absorption effect and sound insulation effect of the upper cover assembly.

[0010] Optionally, the supporting part includes a frame, and cross beams and longitudinal beams fixedly arranged within the frame. The frame is arranged along the circumferential direction of the cover plate. A nut is welded to the supporting part, and the nut is used to be fixed to the vehicle body frame through a bolt.

[0011] Optionally, the supporting part is further provided with a groove, the nut is fixedly arranged on the bottom wall of the groove, a through hole coaxial with the nut is arranged on the bottom wall of the groove, and the end face of the open end of the groove fits against the cover plate.

[0012] Optionally, anti-corrosion coatings are respectively arranged on the outer wall surfaces of the cover plate and the supporting part.

[0013] Optionally, the cover plate, the side wall part and the reinforcing ribs are integrally formed stamping parts.

[0014] Optionally, the lower surface of the side wall part is provided with an arc surface.

[0015] Optionally, the number of the damping pads is at least two, and the damping pads are arranged at intervals and are respectively fixedly bonded to the upper surface of the cover plate.

[0016] Optionally, a silica gel foam is further arranged along the circumferential direction on the upper end face of the cover plate. The ratio of the width to the height of the silica gel foam is greater than, and the height of the silica gel foam is greater than 8 mm.

[0017] Optionally, a silicon foam sealant is further arranged along the circumferential direction on the lower end face of the side wall part. The silicon foam sealant is used to fit against the upper end face of the lower box body of the battery pack.

[0018] This application provides a battery pack, which includes a lower box body and the upper cover assembly as described above. The upper cover assembly covers the open end of the lower box body and is hermetically fixed to the lower box body along the circumferential direction.

[0019] The present application provides a new energy vehicle, including a vehicle body frame and the battery pack as described above, and the upper cover assembly of the battery pack is fixed to the vehicle body frame.

[0020] The battery pack having the upper cover assembly as described above, and the new energy vehicle having the above battery pack have technical effects similar to those of the above upper cover assembly. For the sake of brevity, they will not be elaborated here. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the upper cover assembly of the battery pack provided by an embodiment of the present application;

[0022] Figure 2 is Figure 1 an exploded view of

[0023] Figure 3 is Figure 1 a schematic structural diagram of the middle cover plate and the side wall portion in

[0024] Figure 4 is Figure 1 a schematic structural diagram of the middle support portion;

[0025] Figure 5 is a partial enlarged view of the support portion.

[0026] In the attached Figures 1-5 drawings, the reference numerals are explained as follows:

[0027] 1 Cover plate;

[0028] 2 Side wall portion, 21 Flanging structure, 22 Mounting hole, 23 Arc surface;

[0029] 3 Reinforcing rib;

[0030] 4 Damping pad;

[0031] 5 Support portion, 51 Frame, 52 Cross beam, 53 Longitudinal beam, 54 Groove, 55 Rib;

[0032] 6 Nut;

[0033] 7 Silicone foam;

[0034] 8 Silicon foam sealant. Detailed Description of the Embodiments

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] The embodiments of the present application provide an upper cover assembly of a battery pack, a battery pack and a new energy vehicle. The new energy vehicle includes a battery pack and a vehicle body frame. The battery pack is fixed to the vehicle body frame. The upper end surface of the battery pack forms the bottom plate of the new energy vehicle, and there is no need to additionally provide a bottom plate structure for the vehicle body, which is beneficial to achieving lightweight, increasing the Z-direction installation space of the battery pack and the Z-direction space of the passenger compartment, and is beneficial to extending the endurance performance of the new energy vehicle and improving the riding comfort.

[0037] The battery pack includes a lower box body, an upper cover assembly and electrical components installed in the lower box body. After the electrical components are installed in the lower box body, the upper cover assembly can be covered above the lower box body. The upper surface of the upper cover assembly can form the bottom plate of the new energy vehicle.

[0038] Specifically, as Figures 1-3 shown, the upper cover assembly of the battery pack includes a cover plate 1, a support part 5 and a damping pad 4. Among them, the cover plate 1 is also provided with an integrally formed side wall part 2 along the circumference. The side wall part 2 is located on the lower side of the cover plate 1, that is, on the side facing the lower box body. The end of the side wall part 2 extends outward along the circumference and is provided with a flanging structure 21. A plurality of mounting holes 22 are arranged at intervals along the circumference of the flanging structure 21. The lower end surface of the flanging structure 21 can be attached to the upper end surface of the lower box body and fixed by mounting bolts passing through the mounting holes 22. The size of the mounting holes 22 can be set according to the actual mounting bolts.

[0039] Reinforcing ribs 3 are respectively arranged on the surface of the cover plate 1 and the surface of the side wall part 2 (as Figure 3 shown). The cover plate 1 and the side wall part 2 can be respectively provided with a plurality of reinforcing ribs 3 with different shapes to ensure the overall structural strength of the upper cover assembly. The support part 5 is a hollow structure. The support part 5 is fixed on the upper end surface of the cover plate 1 and can be fixed to the vehicle body frame through fasteners. The setting of the support part 5 can facilitate the disassembly and assembly operation between the cover plate 1 and the vehicle body frame. At the same time, the support part 5 can also enhance the overall structural strength of the upper cover assembly.

[0040] Due to the setting of the reinforcing ribs 3 and the support part 5, the overall structural strength of the upper cover assembly can be guaranteed. There is no need to ensure the structural strength of the upper cover assembly by pouring glue into the battery pack. The upper cover assembly and the lower box body can be detachably connected, such as being installed and fixed by fasteners, and then the support part 5 is fixed to the vehicle body frame through fasteners. At this time, when a failure occurs in the battery pack, it is convenient to disassemble the whole battery pack, then separate the upper cover assembly from the lower box body as a whole, and after repairing the failure in the battery pack, reinstall it on the vehicle body frame, and the operation is relatively convenient.

[0041] The damping pad 4 is laid on the upper end surface of the cover plate 1, which can improve the comfort of stepping on the upper end surface of the battery pack. And due to the setting of the damping pad 4, it can also ensure the NVH (Noise, Vibration, Harshness) performance such as the shock absorption effect and sound insulation effect of the upper cover assembly.

[0042] As Figure 4 shown, the support part 5 includes a frame 51 and cross beams 52 and longitudinal beams 53 fixed inside the frame 51. The frame 51 is arranged along the circumference of the cover plate 1, and is specifically formed by enclosing with the cross beams 52 and longitudinal beams 53. Such a setting can ensure that the support part 5 strengthens the structure of the entire upper cover assembly. A nut 6 is welded to the support part 5 (as Figure 5 shown), and this nut 6 is used to be fixed to the vehicle body frame through a bolt, which is convenient for installation operation. The inner diameter of the nut 6 is preferably not less than 5 mm. Of course, the support part 5 can also be processed to form a threaded hole and be fixed to the vehicle body frame through a bolt, while welding the nut 6 can simplify the processing technology.

[0043] In this embodiment, the number of the cross beams 52 and longitudinal beams 53 arranged inside the frame 51 is not limited. As Figure 4 shown, two cross beams 52 are arranged inside the frame 51. These two cross beams 52 are respectively located under the front row seat and the rear row seat of the new energy vehicle. Two longitudinal beams 53 are connected between one of the cross beams 52 and the frame 51. These two longitudinal beams 53 are located under the rear row seat. Such a setting can ensure the overall structural strength while not affecting the stepping comfort of passengers.

[0044] As Figure 5 shown, the support part 5 is also provided with a groove 54. The nut 6 is fixed to the bottom wall of the groove 54, and a through hole coaxial with the nut 6 is also provided on the bottom wall. Specifically, the nut 6 can be fixed to the surface of the bottom wall, or the nut 6 can be fixed in the through hole of the bottom wall, that is, the nut 6 can be embedded in the through hole. The end face of the open end of the groove 54 fits the cover plate 1, that is, the open end of the groove 54 is arranged downward. That is to say, there is a certain distance between the nut 6 and the cover plate 1 to provide enough installation space for the bolt, so that after being fixed to the vehicle body frame through the bolt, the end of the bolt can pass through the nut 6 to ensure the installation stability and avoid the end of the bolt abutting against the cover plate 1.

[0045] Specifically, the groove 54 can be set as a through groove arranged along the length direction of the cross beam 52. A plurality of nuts 6 are fixedly arranged at intervals along the length direction on the bottom wall of the through groove. To ensure the structural strength, as Figure 5 shown, inside the groove 54, ribs 55 are respectively arranged on both sides of the nut 6, and the ribs 55 are fixed to the two side walls and the bottom wall of the groove 54 respectively.

[0046] In this embodiment, the cover plate 1 and the support portion 5 can be fixed by welding, and after being fixed by welding, the cover plate 1 and the support portion 5 are treated with electrophoretic paint as a whole to form an anti-corrosion coating on the outer wall surface of the cover plate 1 and the support portion 5 to ensure the service life. Of course, the anti-corrosion coating can also be formed on the outer wall surface of the cover plate 1 and the support portion 5 by painting anti-corrosion paint, and when the anti-corrosion coating is formed by electrophoretic paint treatment, the process can be simplified.

[0047] In this embodiment, the cover plate 1, the side wall portion 2 and the reinforcing rib 3 are stamped by integrally stamping a steel plate, the thickness of the steel plate is not less than 7 mm, the depth of the reinforcing rib 3 is not less than 5 mm, and it protrudes toward the upper surface of the cover plate 1 to avoid occupying the space in the battery pack. Alternatively, the reinforcing rib 3 can be fixed to the surface of the cover plate 1 by welding, and the cover plate 1, the side wall portion 2 and the reinforcing rib 3 are formed by stamping, which can simplify the processing technology and also help to reduce the overall weight.

[0048] The steel plate is preferably a DC06 steel plate, with a tensile strength of 270Mpa-330Mpa and an elongation of not less than 41%, so as to facilitate stamping to form a higher side wall portion 2, and the support portion 5 is also preferably DC06 steel.

[0049] In this embodiment, the number of the damping pads 4 is at least two, and the damping pads 4 are arranged at intervals. The setting position of the damping pads 4 can be set according to the specific pedaling area inside the new energy vehicle, such as Figure 1 and Figure 2 As shown, when the new energy vehicle is provided with two rows of seats, the pedal positions of the main driving area of ​​the front seats, the co-pilot area and the rear seats are respectively provided with damping pads 4. At this time, the number of damping pads 4 is three. When the new energy vehicle is provided with three rows of seats, the pedal positions of the third row of seats are also correspondingly provided with damping pads 4. At this time, the number of damping pads 4 is four.

[0050] Of course, the number of damping pads 4 can also be set to one, and a whole damping pad 4 can be laid on the upper end surface of the cover plate 1 to ensure the stepping comfort at all positions. The damping pad 4 is only provided at the stepping position. Compared with the solution of laying the damping pad 4 on the entire upper surface of the cover plate 1, the cost can be reduced.

[0051] The damping pad 4 is bonded and fixed to the upper surface of the cover plate 1 by adhesive, the thickness of the damping pad 4 is not less than 2 mm (such as 3 mm), and the damping factor of the damping pad 4 at 200 Hz and the value tested at 20°C is not less than 0.1 to ensure pedaling comfort.

[0052] The damping pad 4 is fixed to the upper surface of the cover plate 1 by adhesive bonding. Compared with the traditional hot-melt damping pad 4, the hot-melt baking process is omitted, thereby improving the efficiency of the entire battery pack assembly.

[0053] A first seal is provided circumferentially on the side wall portion 2 of the end cap. The first seal is used to fit against the side wall of the vehicle body to achieve sealing. A second seal is provided circumferentially on the lower end surface of the end cap. This second seal is used to fit against the upper end surface of the lower box body to achieve the sealing of the battery pack. After integrating the first seal and the second seal into the upper cover assembly, it facilitates the overall assembly operation, improves the assembly efficiency, and at the same time can ensure the sealing stability. There are no restrictions on the first seal and the second seal, and they can be the same or different.

[0054] As Figure 1 and Figure 2 shown, the first seal is preferably a silicone foam 7 provided circumferentially along the cover plate 1. This silicone foam 7 can be adhesively fixed to the cover plate 1 through back glue. The ratio of the width to the height of the silicone foam 7 is not less than 2. Among them, the height of the silicone foam 7 should be greater than 8 mm, such as a width of 20 mm and a height of 10 mm. The relatively large ratio of the width to the height of the silicone foam 7 makes it not easy to tilt in the use state, ensuring the sealing performance after fitting against the side wall of the vehicle body, and thus improving the sealing reliability with the vehicle body. This first seal can also be a silicon foam sealant 8 or a sealing strip. Since the first seal has a large volume, when using the silicone foam 7, it can simplify the process and reduce costs.

[0055] The second seal is preferably a silicon foam sealant 8 provided circumferentially along the lower end surface of the side wall portion 2. Specifically, it is coated online by a machine on the lower end surface of the side wall portion 2 (i.e., the lower end surface of the flanging structure 21) and placed in the air to foam and cure, realizing the fixation of the silicon foam sealant 8 to the flanging structure 21. The height of this silicon foam sealant 8 is not less than 5 mm. This second seal can also be a sealing foam or a sealing strip, and no specific restrictions are made here.

[0056] The cover plate 1 and the side wall portion 2 are stamping parts, and the thickness of the steel plate is relatively thin, while the thickness of the lower box body is relatively large. Therefore, when the overall height of the battery pack is certain, the height of the side wall portion 2 of the upper cover assembly can be appropriately increased, and the height of the lower box body can be correspondingly reduced, which is beneficial to achieving weight reduction and cost reduction.

[0057] Electrical components are installed in the lower box body, and its height can be set according to the installation requirements of each electrical component. For example, if there is no need to connect to an electrical component at a local position, the height here can be set relatively low, or if there is a need to connect to an electrical component at a higher position at a local position, the height here can be set relatively high. In this way, it causes the upper opening edge of the lower box body to form a concave structure or a convex structure. Compared with increasing the overall height of the lower box body, it can achieve the effects of weight reduction and cost reduction.

[0058] The concave structure and the convex structure are preferably arranged as arc surfaces. Correspondingly, the lower surface of the side wall portion 2 of the upper cover assembly is also correspondingly arranged with a convex structure and a concave structure having an arc surface 23 (as Figure 3 shown). In the installed state, the lower surface of the side wall portion 2 and the upper end surface of the lower box body can be circumferentially fitted and sealed and fixed.

[0059] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An upper cover assembly of a battery pack, the battery pack being installed in a new energy vehicle, characterized in that, The upper cover assembly of the battery pack includes a cover plate (1), a support part (5), and a damping pad (4); The cover plate (1) is provided with an integrally formed side wall part (2) along the circumference. The surface of the cover plate (1) and the side wall part (2) are respectively provided with reinforcing ribs (3). The damping pad (4) is arranged on the upper end surface of the cover plate (1); The support part (5) is a hollow structure and is welded to the upper end surface of the cover plate (1). The support part (5) is fixed to the vehicle body frame of the new energy vehicle through fasteners.

2. The upper cover assembly of the battery pack according to claim 1, wherein, The support part (5) includes a frame (51), and cross beams (52) and longitudinal beams (53) fixed inside the frame (51). The frame (51) is arranged along the circumference of the cover plate (1). A nut (6) is welded to the support part (5), and the nut (6) is used to be fixed to the vehicle body frame through a bolt.

3. The upper cover assembly of the battery pack according to claim 2, characterized in that, The support part (5) is further provided with a groove (54). The nut (6) is fixed to the bottom wall of the groove (54). A through hole coaxial with the nut (6) is provided on the bottom wall of the groove. The end surface of the open end of the groove (54) is attached to the cover plate (1).

4. The upper cover assembly of the battery pack according to any one of claims 1-3, characterized in that Anticorrosion coatings are respectively provided on the outer wall surfaces of the cover plate (1) and the support part (5).

5. The upper cover assembly of the battery pack according to any one of claims 1-3, characterized in that, The cover plate (1), the side wall part (2), and the reinforcing ribs (3) are integrally formed stamping parts.

6. The upper cover assembly of the battery pack according to claim 5, characterized in that, The lower surface of the side wall part (2) is provided with an arc surface (23).

7. The upper cover assembly of the battery pack according to any one of claims 1-3, characterized in that, The number of the damping pads (4) is at least two. Each damping pad (4) is arranged at intervals and is respectively fixed to the upper surface of the cover plate (1) by adhesion.

8. The upper cover assembly of the battery pack according to any one of claims 1-3, characterized in that, Silicone foam (7) is further arranged along the circumference on the upper end surface of the cover plate (1). The ratio of the width to the height of the silicone foam (7) is greater than 2, and the height of the silicone foam (7) is greater than 8 mm.

9. The upper cover assembly of the battery pack according to any one of claims 1-3, characterized in that Silicone foam sealant (8) is further arranged along the circumference on the lower end surface of the side wall part (2). The silicone foam sealant (8) is used to be attached to the upper end surface of the lower box body of the battery pack.

10. A battery pack, characterized in that, It includes a lower box body and the upper cover assembly as described in any one of claims 1-9. The upper cover assembly covers the open end of the lower box body and is hermetically fixed to the lower box body along the circumference.

11. A new energy vehicle, characterized in that, It includes a vehicle body frame and the battery pack as described in claim 10. The upper cover assembly of the battery pack is fixed to the vehicle body frame.

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