Battery pack upper cover, CTB battery pack and electric vehicle

Abstract

The utility model provides a battery pack upper cover, a CTB battery pack and an electric automobile, and relates to the technical field of new energy automobiles, the battery pack upper cover comprises an upper cover body, the upper cover body comprises a steel plate structure layer, an upper structure layer, a lower structure layer and a thickened structure layer, and the upper structure layer, the lower structure layer and the thickened structure layer are made of composite materials. Wherein the upper structural layer and the lower structural layer are attached to and connected to the two sides of the steel plate structural layer respectively, and the thickened structural layer is arranged on the side, away from the upper structural layer, of the lower structural layer and located at the edge position of the lower structural layer. Compared with the prior art, the upper cover of the battery pack has the advantages that the edge strength of the upper cover of the battery pack is improved, and the structural stability of the upper cover of the battery pack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a battery pack upper cover, a CTB battery pack and an electric vehicle. Background Art

[0002] The CTB (Cell to Battery) battery pack is a technology that directly integrates battery cells into the battery pack, aiming to improve the energy density, efficiency and overall performance of the battery system. This type of battery pack is commonly used in the field of electric vehicles. The battery pack is mainly protected by the battery shell, which is mainly composed of a lower shell and an upper cover. The lower shell is usually made of metal. In order to meet the flame retardant, insulation and high voltage resistance requirements of the battery pack upper cover, the upper cover is usually made of a composite material and a steel plate. The outer edge of the upper cover is usually provided with multiple threaded holes for installation on the lower shell. However, this will reduce the original stiffness and load-bearing capacity, thereby affecting the structural stability of the upper cover. Utility Model Content

[0003] The problem to be solved by the utility model is: how to enhance the structural stability of the upper cover.

[0004] The utility model provides a battery pack upper cover, comprising: an upper cover body, wherein the upper cover body comprises a steel plate structural layer and an upper structural layer, a lower structural layer and a thickened structural layer made of composite materials, wherein the upper structural layer and the lower structural layer are respectively adhered to and connected to both sides of the steel plate structural layer, and the thickened structural layer is arranged on the side of the lower structural layer away from the upper structural layer and is located at the edge of the lower structural layer.

[0005] The battery pack cover provided by the present invention has the following advantages over the prior art, but is not limited to the following:

[0006] The battery pack cover described in the present invention has an upper structural layer and a lower structural layer of the upper cover body made of composite materials, which can provide insulation and flame retardancy. The steel plate structural layer is located between the upper structural layer and the lower structural layer to increase the overall strength of the upper cover body. A thickened structural layer is provided on the side of the lower structural layer facing away from the upper structural layer and at the edge of the lower structural layer. The thickened structural layer can be partially or completely thickened according to product requirements to enhance the edge strength of the upper cover body, thereby ensuring the structural stability of the battery pack cover. Compared with the existing technology, the battery pack cover of the present invention improves the edge strength of the battery pack cover and ensures the structural stability of the battery pack cover.

[0007] Optionally, the upper cover body further includes a compensation structure layer made of the composite material, the compensation structure layer is disposed at an edge position between the upper structure layer and the lower structure layer, and the compensation structure layer, the upper structure layer and the lower structure layer are used to jointly cover the steel plate structure layer completely.

[0008] Optionally, the thickness of the compensation structure layer is equal to the thickness of the steel plate structure layer.

[0009] Optionally, a plurality of threaded holes are evenly distributed at the edge position of the upper cover body, and the upper cover body is used to connect with the lower shell of the battery pack through the plurality of threaded holes thereon.

[0010] Optionally, a C-shaped bushing is respectively disposed in each of the threaded holes.

[0011] Optionally, the projection of the thickened structure layer on the steel plate structure layer coincides with a partial area of the steel plate structure layer.

[0012] Optionally, the thicknesses of the upper structure layer, the lower structure layer and the thickened structure layer are all 0.3 mm to 3 mm.

[0013] Optionally, the composite material is CFRTP material.

[0014] In addition, the present invention further provides a CTB battery pack, including the battery pack upper cover as described above.

[0015] Since the technical improvement and the achieved technical effects of the CTB battery pack are the same as those of the battery pack upper cover, the technical effects of the CTB battery pack will not be described in detail herein.

[0016] In addition, the present invention further provides an electric vehicle, including the CTB battery pack as described above.

[0017] Since the technical improvement and the achieved technical effects of the electric vehicle are the same as those of the CTB battery pack, the technical effects of the electric vehicle will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a top view of the battery pack upper cover according to an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0020] Figure 3 is Figure 2 a partial enlarged view at B in

[0021] Figure 4 is a perspective view of the battery pack upper cover according to an embodiment of the present utility model;

[0022] Figure 5 This is a schematic structural view of the C-shaped bushing according to an embodiment of the present utility model.

[0023] Explanation of reference numerals in the drawings:

[0024] 1. Upper cover body; 11. Steel plate structure layer; 12. Upper structure layer; 13. Lower structure layer; 14. Compensation structure layer; 15. Thickened structure layer; 2. Threaded hole; 3. C-shaped bushing; 4. Seat crossbeam. Detailed implementation manners

[0025] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the drawings.

[0026] In the description of the present utility model, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "top", "bottom", "front", "rear", "inner" and "outer" is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and does not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation on the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment" and "one implementation manner" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or implementation manner are included in at least one embodiment or implementation manner of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or implementation manner. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementation manners in a suitable manner.

[0029] Moreover, the Z-axis in the drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the arrow direction of the Z-axis) represents up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents down.

[0030] It should also be noted that the aforementioned Z-axis representation is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] like Figures 1 to 4 As shown, the battery pack upper cover of an embodiment of the present invention includes: an upper cover body 1, the upper cover body 1 includes a steel plate structural layer 11 and an upper structural layer 12, a lower structural layer 13 and a thickened structural layer 15 made of composite materials, wherein the upper structural layer 12 and the lower structural layer 13 are respectively adhered and connected to both sides of the steel plate structural layer 11, and the thickened structural layer 15 is arranged on the side of the lower structural layer 13 away from the upper structural layer 12 and is located at the edge of the lower structural layer 13.

[0032] In this embodiment, combined with the Figures 1 to 4 As shown, the battery pack cover, wherein the upper structural layer 12 and the lower structural layer 13 of the upper cover body are both made of composite materials, can play an insulating and flame retardant role, the steel plate structural layer 11 is located between the upper structural layer 12 and the lower structural layer 13, can increase the overall strength of the upper cover body 1, and a thickened structural layer 15 is provided on the side of the lower structural layer 13 away from the upper structural layer 12 and at the edge of the lower structural layer 13, wherein the thickened structural layer 15 can be partially or completely thickened according to product requirements to enhance the edge strength of the upper cover body 1, thereby ensuring the structural stability of the battery pack cover. Compared with the prior art, the battery pack cover of the present invention improves the edge strength of the battery pack cover and ensures the structural stability of the battery pack cover.

[0033] Optionally, the upper cover body 1 also includes a compensation structure layer 14 made of composite material, and the compensation structure layer 14 is arranged at the edge position between the upper structure layer 12 and the lower structure layer 13. The compensation structure layer 14, the upper structure layer 12 and the lower structure layer 13 are used to completely cover the steel plate structure layer 11 together.

[0034] In this embodiment, combined with the Figure 3 As shown, the planar dimensions of the upper structural layer 12 and the lower structural layer 13 are the same and larger than the planar dimensions of the steel plate structural layer 11. The compensation structural layer 14 is located between the upper structural layer 12 and the lower structural layer 13, and is located at the edge between the upper structural layer 12 and the lower structural layer 13. The compensation structural layer 14, the upper structural layer 12 and the lower structural layer 13 can completely cover the steel plate structural layer 11 together, wherein complete covering can be understood as the upper end surface of the steel plate structural layer 11 (see FIG. Figure 3In the Z-axis direction, it contacts the upper structural layer 12. The lower end surface of the steel plate structural layer 11 contacts the lower structural layer 13, and the other four side surfaces of the steel plate structural layer 11 respectively contact the compensation structural layer 14. After the steel plate structural layer 11 is completely coated, it will not contact the outside world, which can prevent the steel plate structural layer 11 from being corroded. If the planar dimensions of the upper structural layer 12, the lower structural layer 13, and the steel plate structural layer 11 are all the same, after the side position contacts the outside world for a long time, cracks will occur at the edge positions where the steel plate structural layer 11 is connected to the upper structural layer 12 and the lower structural layer 13. After the steel plate structural layer 11 is completely coated in the above manner, the above problems will not occur.

[0035] It should be noted that the compensation structural layer 14 can be an integral structure, and a through groove adapted to the shape of the steel plate structural layer 11 is provided at the central position thereof, and the steel plate structural layer 11 can be embedded in the through groove.

[0036] Optionally, the thickness of the compensation structural layer 14 is equal to the thickness of the steel plate structural layer 11.

[0037] Optionally, a plurality of threaded holes 2 are uniformly arranged at the edge positions of the upper cover body 1, and the upper cover body 1 is used to connect to the lower shell of the battery pack through the plurality of threaded holes 2 thereon.

[0038] In this embodiment, in combination with the attached Figure 1 or the attached Figure 4 As shown, the upper cover body 1 as a whole can be a rectangular plate-like structure, and a plurality of threaded holes 2 are uniformly arranged at the edge positions thereof. The upper cover body 1 can be connected to the lower shell of the battery pack through the plurality of threaded holes 2 thereon by fastening bolts, so as to fix the upper cover body 1 relative to the lower shell of the battery pack.

[0039] Optionally, a C-shaped bushing 3 is respectively arranged in each of the threaded holes 2.

[0040] In this embodiment, in combination with the attached Figure 4 and the attached Figure 5 As shown, a C-shaped bushing 3 is respectively arranged in each of the threaded holes 2, and the C-shaped bushing 3 can reduce the torque attenuation of the fastening bolt.

[0041] Optionally, the projection of the thickened structural layer 15 on the steel plate structural layer 11 coincides with a partial area of the steel plate structural layer 11.

[0042] In this embodiment, in combination with the attached Figure 3 As shown, the projection of the thickened structural layer 15 on the steel plate structural layer 11 coincides with a partial area of the steel plate structural layer 11, and the width of the overlapping area is at least 25 mm. The thickened structural layer 15 can be thickened locally or in a whole circle according to product requirements to enhance the edge strength of the composite material.

[0043] Optionally, the thicknesses of the upper structural layer 12, the lower structural layer 13, and the thickened structural layer 15 are all 0.3 mm to 3 mm.

[0044] In this embodiment, the thicknesses of the upper structural layer 12, the lower structural layer 13, and the thickened structural layer 15 are 0.3 mm to 3 mm. The thicknesses of the three can be the same. For example, 1.5 mm is selected for all of them. The thicknesses of the three can also be different. For example, the thickness of the upper structural layer 12 is 1 mm, the thickness of the lower structural layer 13 is 1.5 mm, and the thickness of the thickened structural layer 15 is 2.5 mm. The thicknesses of the three can be selected according to actual needs. Both the upper structural layer 12 and the lower structural layer 13 play the roles of insulation and flame retardancy. The thickened structural layer 15 can be thickened locally or in a full circle according to product requirements to increase the edge strength of the upper cover body 1.

[0045] Optionally, the composite material is CFRTP material.

[0046] In this embodiment, the upper structural layer 12, the lower structural layer 13, the thickened structural layer 15, and the compensation structural layer 14 can all be made of CFRTP composite material. Among them, the CFRTP composite material can be recycled, and at the same time has high strength and good toughness, meeting the requirements of flame retardancy, high insulation, and high voltage resistance of the battery pack upper cover, and is not easy to crack. At the same time, since the CFRTP composite material is a thermoplastic composite material, when processing the battery pack upper cover, only the CFRTP composite material (the upper structural layer 12 and the lower structural layer 13) and the steel plate (the steel plate structural layer 11) need to be placed in the mold and heated, and then the steel plate can be attached to the CFRTP composite material.

[0047] It should be noted that continuous fiber reinforced thermoplastic composites (CFRTP, Continuous Fiber Reinforced Thermoplastic composites) are high-strength, high-rigidity, and high-toughness composite materials manufactured by using continuous fibers as the reinforcing material and thermoplastic resin as the matrix through the process of melting and impregnating the thermoplastic resin. The selectable reinforcing materials include glass fiber, carbon fiber, aramid fiber, plant fiber, and basalt fiber.

[0048] Before processing the upper cover of the battery pack, multiple thin composite plates can be processed in advance using CFRTP composites. Then, when processing the upper cover of the battery pack, the multiple thin composite plates are stacked and laid flat on the template as the lower structural layer 13. Then, the steel plate is placed on the lower structural layer 13, and the multiple thin composite plates are stacked and laid flat on the steel plate as the upper structural layer 12. Then, by heating, the multiple thin composite plates can be connected to each other as a whole, that is, the upper structural layer 12 and the lower structural layer 13 are formed, and the steel plate can also be attached between the upper structural layer 12 and the lower structural layer 13. In addition, the thickness of the upper structural layer 12 and the lower structural layer 13 can be determined by increasing or decreasing the number of thin composite plates.

[0049] In addition, the present invention also provides a CTB battery pack, including the battery pack upper cover as described above.

[0050] Since the technical improvements and achieved technical effects of the CTB battery pack are the same as those of the battery pack upper cover, the technical effects of the CTB battery pack will not be described in detail.

[0051] In addition, the present invention also provides an electric vehicle, including the CTB battery pack as described above.

[0052] Since the technical improvements and achieved technical effects of the electric vehicle are the same as those of the CTB battery pack, the technical effects of the electric vehicle will not be described in detail.

[0053] It should be noted that, as shown in the attached Figure 4 The battery pack upper cover (upper cover body 1) of the CTB battery pack can be used as the vehicle floor, and the battery pack upper cover is adhesively integrated with the seat crossbeam 4.

[0054] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. A battery pack upper cover, characterized in that, include: An upper cover body (1), the upper cover body (1) comprising a steel plate structural layer (11) and an upper structural layer (12), a lower structural layer (13) and a thickened structural layer (15) made of composite materials, wherein the upper structural layer (12) and the lower structural layer (13) are respectively adhered to and connected to both sides of the steel plate structural layer (11), and the thickened structural layer (15) is arranged on a side of the lower structural layer (13) away from the upper structural layer (12) and is located at the edge of the lower structural layer (13).

2. The battery pack upper cover according to claim 1, wherein The upper cover body (1) further comprises a compensation structural layer (14) made of the composite material, wherein the compensation structural layer (14) is arranged at an edge position between the upper structural layer (12) and the lower structural layer (13), and the compensation structural layer (14), the upper structural layer (12) and the lower structural layer (13) are used to completely cover the steel plate structural layer (11) together.

3. The battery pack upper cover according to claim 2, characterized in that, The thickness of the compensation structural layer (14) is equal to the thickness of the steel plate structural layer (11).

4. The battery pack upper cover according to claim 1, characterized in that, A plurality of threaded holes (2) are evenly distributed at the edge of the upper cover body (1), and the upper cover body (1) is used to be connected to the lower shell of the battery pack through the plurality of threaded holes (2) thereon.

5. The battery pack upper cover according to claim 4, characterized in that, A C-shaped bushing (3) is provided in each threaded hole (2).

6. The battery pack upper cover according to claim 1, wherein, The projection of the thickened structural layer (15) on the steel plate structural layer (11) overlaps with a partial area of the steel plate structural layer (11).

7. The battery pack upper cover according to claim 1, characterized in that, The thicknesses of the upper structural layer (12), the lower structural layer (13) and the thickened structural layer (15) are all between 0.3 mm and 3 mm.

8. The battery pack upper cover according to any one of claims 1-7, characterized in that, The composite material is CFRTP material.

9. A CTB battery pack, characterized in that, Comprising a battery pack cover as described in any one of claims 1-8.

10. An electric vehicle, characterized in that, Comprising the CTB battery pack as claimed in claim 9.

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