Battery pack upper cover, battery pack and vehicle

Abstract

The application discloses a battery pack upper cover, a battery pack and a vehicle, and relates to the technical field of batteries. The battery pack upper cover comprises a first reinforcing layer, a base material layer and a second reinforcing layer which are sequentially stacked along a first direction; at least the second reinforcing layer is insulatively arranged; and the first reinforcing layer is connected with the second reinforcing layer to fix the base material layer between the first reinforcing layer and the second reinforcing layer. The battery pack upper cover, the battery pack and the vehicle provided by the application are beneficial to the light weight of the battery pack upper cover, the battery pack and the vehicle.

Description

Technical Field

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

[0002] The battery pack cover serves several purposes: providing physical protection for the battery modules inside the pack and providing auxiliary functions such as electrical insulation. With the rapid development of new energy vehicle technology, the design of the battery pack cover needs to balance multiple requirements, including structural strength, sealing protection, and lightweighting. However, existing battery pack covers often suffer from significant overall weight. Utility Model Content

[0003] This disclosure provides a battery pack cover, a battery pack, and a vehicle, which facilitates the lightweighting of the battery pack cover.

[0004] According to one aspect of this disclosure, a battery pack cover is provided, comprising a first reinforcing layer, a substrate layer, and a second reinforcing layer stacked sequentially along a first direction; at least the second reinforcing layer is insulated; the substrate layer has a through-hole, and the first reinforcing layer and the second reinforcing layer are connected at least through the first hole to fix the substrate layer between the first and second reinforcing layers. When connecting the battery pack cover of this disclosure to other components of the battery pack and installing it in a vehicle, the second reinforcing layer can be installed on the side closer to the battery module, thereby ensuring electrical insulation between the battery module and the battery pack cover. The battery pack cover of this disclosure is a sandwich composite structure, which can ensure the anti-collision protection function of the battery pack cover through the substrate layer, and achieve the sealing and insulation functions of the battery pack cover through the first and second reinforcing layers. The first hole can reduce the weight of the substrate layer, which is beneficial to the overall weight reduction of the battery pack cover. The first reinforcing layer and the second reinforcing layer are connected at least through the first hole to clamp and fix the substrate layer, which can improve the firmness of the connection between the first and second reinforcing layers. The battery pack cover disclosed herein can be customized in terms of the shape and position of the substrate layer according to the requirements of anti-collision protection, thereby reducing the weight of the battery pack cover under the same strength, or improving the anti-collision protection performance of the battery pack cover under the same weight.

[0005] In one exemplary embodiment of this disclosure, the substrate layer comprises a metallic material, thereby possessing good strength and impact resistance.

[0006] In one exemplary embodiment of this disclosure, a plurality of protruding first connecting portions are provided on one side of the first reinforcing layer near the substrate layer; when the first connecting portions are in contact with the substrate layer, the first connecting portions extend into the first holes one by one and connect with the second reinforcing layer. The first connecting portions help to further improve the firmness of the connection between the first reinforcing layer and the second reinforcing layer, as well as the firmness of the first reinforcing layer and the second reinforcing layer in clamping and fixing the substrate layer.

[0007] In one exemplary embodiment of this disclosure, a plurality of protruding second connecting portions are provided on one side of the second reinforcing layer near the substrate layer; when the second connecting portions are in contact with the substrate layer, the second connecting portions extend into the first holes one by one and connect with the first reinforcing layer. The second connecting portions help to further improve the firmness of the connection between the first reinforcing layer and the second reinforcing layer, as well as the firmness of the first reinforcing layer and the second reinforcing layer in clamping and fixing the substrate layer.

[0008] In one exemplary embodiment of this disclosure, the substrate layer includes a thinned region and a main body region outside the thinned region, the thickness of the thinned region being less than that of the main body region; the first reinforcing layer has a through-hole, the second hole exposing at least a portion of the main body region. The thinned region and the second hole can achieve further weight reduction of the battery pack cover.

[0009] In one exemplary embodiment of this disclosure, the battery pack cover is used to connect to the vehicle floor via a seat crossbeam; the seat crossbeam is used to weld to the battery pack cover in the main body area exposed by the second hole. By integrating the seat crossbeam with the vehicle floor, the battery pack cover can bear the vertical load, and the force on the seat crossbeam can be effectively transferred to the entire battery pack cover through the substrate layer, which is beneficial for optimizing the force path.

[0010] In one exemplary embodiment of this disclosure, the substrate layer includes a thinning region, and the first reinforcing layer has a through-hole that exposes at least a portion of the thinning region. The third hole and the thinning region can achieve greater weight reduction while ensuring the sealing and insulation function of the battery pack cover.

[0011] In one exemplary embodiment of this disclosure, the substrate layer is projected along the thickness direction of the first reinforcing layer within the outer contour of the first reinforcing layer; the substrate layer is projected into the second reinforcing layer within the outer contour of the second reinforcing layer. The first and second reinforcing layers can be connected by hot pressing or molding through the outer edge of the contour without the substrate layer, which helps to improve the strength of the connection between the first and second reinforcing layers and improve the overall flatness of the battery pack cover.

[0012] In one exemplary embodiment of this disclosure, the first reinforcing layer includes an electrical component mounting area and a welding area along a second direction, which is perpendicular to the first direction. A first mounting portion is provided on the side of the electrical component mounting area away from the substrate layer. The first mounting portion can be used to fix electrical components within the battery pack, eliminating the need for a traditional multi-functional electrical component mounting bracket in the battery pack. This facilitates weight reduction in the battery pack and shortens the assembly dimension chain. Integrating the electrical component mounting points into the battery pack cover simplifies the process and reduces assembly difficulty.

[0013] In one exemplary embodiment of this disclosure, the orthographic projection of the substrate layer along the thickness direction of the first reinforcing layer lies outside the electrical component mounting area. This is beneficial for the insulation of the electrical components and also allows for the targeted shaping and positioning of the substrate layer according to impact protection requirements, thereby reducing the weight of the battery pack cover under the same strength or improving the impact protection performance of the battery pack cover under the same weight.

[0014] In one exemplary embodiment of this disclosure, the side of the electrical component mounting area near the second reinforcing layer is attached and connected to the side of the second reinforcing layer near the first reinforcing layer.

[0015] In one exemplary embodiment of this disclosure, the height of the first mounting portion protrusion is no greater than 9 mm. This ensures easy installation of electrical components while maintaining the overall strength and rigidity of the first reinforcing layer and providing sufficient space for the installation of electrical components.

[0016] In one exemplary embodiment of this disclosure, the first reinforcing layer comprises a glass fiber resin composite material; and / or, the second reinforcing layer comprises a glass fiber resin composite material. This helps to reduce the weight of the battery pack cover while also reinforcing the substrate layer.

[0017] In one exemplary embodiment of this disclosure, a first connecting portion is provided on one side of the first reinforcing layer near the substrate layer; the depth to which the first connecting portion extends into the first hole is equal to the thickness of the substrate layer; the first connecting portion connects to the second reinforcing layer through the first hole. This can reduce the weight of the substrate layer, which is beneficial for the overall weight reduction of the battery pack cover. The first connecting portion further improves the firmness of the connection between the first and second reinforcing layers, as well as the firmness of the first and second reinforcing layers in clamping and fixing the substrate layer.

[0018] In one exemplary embodiment of this disclosure, both sides of the second reinforcing layer in the first direction are planar. This allows for further simplification of the structure of the second reinforcing layer.

[0019] According to another aspect of this disclosure, a battery pack is provided, including the battery pack cover of any of the foregoing claims, wherein a first reinforcing layer is disposed on the side of the battery pack cover away from the battery module. When the battery pack of this disclosure is installed in a vehicle, a second reinforcing layer can be installed on the side closer to the battery module, thereby ensuring electrical insulation between the battery module and the battery pack cover. The battery pack cover of this disclosure has a sandwich composite structure, which can ensure the anti-collision protection function of the battery pack cover through the base material layer, and achieve the sealing and insulation functions of the battery pack cover through the first reinforcing layer and the second reinforcing layer. Therefore, the shape and position of the base material layer can be specifically set according to the anti-collision protection requirements, reducing the weight of the battery pack under the same strength, or improving the anti-collision protection performance of the battery pack under the same weight.

[0020] According to another aspect of this disclosure, a vehicle is provided, including the battery pack of any of the foregoing embodiments. The battery pack of this disclosure has good insulation performance, which is beneficial to the electrical safety of the vehicle. The battery pack cover has a sandwich composite structure, which can ensure the collision protection function of the battery pack cover through the substrate layer, and achieve the sealing and insulation functions of the battery pack cover through the first reinforcing layer and the second reinforcing layer. Therefore, the shape and position of the substrate layer can be specifically set according to the collision protection requirements, reducing the overall vehicle weight under the same strength, or improving the collision protection performance of the battery pack under the same weight.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] Figure 1 This is an exploded view of an exemplary embodiment of the battery pack cover of this disclosure.

[0024] Figure 2 This is a schematic diagram of the substrate layer in one exemplary embodiment of the battery pack cover of this disclosure.

[0025] Figure 3 This is a schematic diagram of the side of the first reinforcing layer near the substrate layer in an exemplary embodiment of the battery pack cover of this disclosure.

[0026] Figure 4 This is a schematic diagram of the side of the first reinforcing layer away from the substrate layer in an exemplary embodiment of the battery pack cover of this disclosure.

[0027] Figure 5 This is a schematic diagram of the maintenance cover and seat crossbeam in one exemplary embodiment of the battery pack cover of this disclosure.

[0028] Figure 6 A schematic diagram of an exemplary embodiment of the battery pack disclosed herein.

[0029] Figure 7 This is a schematic diagram of the battery pack in the vehicle.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Substrate layer; 11. First hole; 12. Thinning zone;

[0032] 2. First reinforcing layer; 21. First connecting part; 22. Second hole; 23. Electrical component mounting area; 231. First mounting part; 24. Third hole;

[0033] 3. Second reinforcement layer; 4. Repair cover; 51. Rear floor crossbeam; 52. Seat crossbeam; 53. Foot pedal crossbeam; 54. Front fender crossbeam. Detailed Implementation

[0034] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0035] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to those listed; the terms “first” and “second” are used only as illustrative marks and are not intended to limit the number, importance, or order of the objects.

[0036] The terms “connection” and “fixation” should be interpreted broadly. For example, “connection” can mean an integral connection or a detachable connection; it can mean a direct connection or an indirect connection through an intermediate medium.

[0037] The phrase "part A is located on part B" as described in this disclosure can mean that part A is directly connected to part B, or that part A is located on part C, and part C is located on part B.

[0038] Furthermore, in this application, directional terms such as "top / upper" and "bottom / lower" are used only to indicate relative positional relationships. For example, for convenience, they are defined based on the actual position and state of the battery pack and the vehicle during operation, or relative to the indicated placement of components in the accompanying drawings. For example, based on the common understanding of a vehicle by those skilled in the art, the direction closer to the roof is used as "top / upper," and the direction closer to the ground is used as "bottom / lower." Therefore, the battery pack cover is installed on the top of the battery pack housing, and the battery pack cover is located above the battery modules inside the battery pack. It should be understood that these directional terms are relative concepts and can change accordingly depending on the placement of the battery pack and the vehicle.

[0039] For ease of description, this disclosure defines the orientation of the battery pack cover, the battery pack, and the vehicle using a typical vehicle space rectangular coordinate system, with the direction perpendicular to the ground as the first direction Z, the vehicle's front-to-back direction as the second direction X, and the vehicle's left-to-right direction as the third direction Y.

[0040] According to one aspect of this disclosure, a battery pack cover is provided, including a first reinforcing layer 2, a substrate layer 1 and a second reinforcing layer 3 stacked sequentially along a first direction; at least the second reinforcing layer 3 is insulated; the substrate layer 1 is provided with a through first hole 11, and the first reinforcing layer 2 and the second reinforcing layer 3 are connected at least through the first hole 11 to fix the substrate layer 1 between the first reinforcing layer 2 and the second reinforcing layer 3.

[0041] refer to Figure 1 This diagram shows an exploded view of the battery pack cover of this disclosure. A first reinforcing layer 2, a substrate layer 1, and a second reinforcing layer 3 are stacked along the Z-direction. The battery pack cover of this disclosure can be connected via the first reinforcing layer 2 and the second reinforcing layer 3, with the substrate layer 1 sandwiched between the first reinforcing layer 2 and the second reinforcing layer 3. The second reinforcing layer 3 is insulated. When connecting the battery pack cover of this disclosure to other components of the battery pack or installing it in a vehicle, the second reinforcing layer 3 can be installed on the side closer to the battery module, thereby ensuring electrical insulation between the battery module and the battery pack cover. Compared with battery pack covers in related technologies, the battery pack cover of this disclosure has a sandwich composite structure. The substrate layer 1 ensures the anti-collision protection function of the battery pack cover, and the first reinforcing layer 2 and the second reinforcing layer 3 achieve the sealing and insulation functions of the battery pack cover. The first hole 11 can reduce the weight of the substrate layer 1, which is beneficial to the overall weight reduction of the battery pack cover. The first reinforcing layer 2 and the second reinforcing layer 3 are connected at least through the first hole 11, clamping and fixing the substrate layer 1, which can improve the firmness of the connection between the first reinforcing layer 2 and the second reinforcing layer 3. The battery pack cover of this disclosure can be designed with the shape and position of the substrate layer 1 according to the requirements of anti-collision protection, reducing the weight of the battery pack cover under the same strength, or improving the anti-collision protection performance of the battery pack cover under the same weight.

[0042] Specifically, the substrate layer 1 may include a metallic material with good strength and impact resistance. The substrate layer 1 is sandwiched between the first reinforcing layer 2 and the second reinforcing layer 3. When the battery pack cover is subjected to external force, such as an impact, the first reinforcing layer 2 and the second reinforcing layer 3 can clamp the substrate layer 1, transferring the impact force to the entire substrate layer 1. For example, the substrate layer 1 may include high-strength steel or ultra-high-strength steel. Exemplarily, the substrate layer 1 may be made of steel plates such as HC260LA, HC420 / 780DP, HC650 / 980DP, HC820 / 1180DP, hot-formed 1300MPa, hot-formed 1800MPa, etc. The substrate layer 1 may be an integrally formed steel plate, and its thickness may be 0.6-1mm. For example, in one embodiment, the thickness of the substrate layer 1 is 0.8mm.

[0043] The first reinforcing layer 2 may include a non-metallic material, which is beneficial for achieving a lightweight battery pack cover. For example, the first reinforcing layer 2 may include a glass fiber resin composite material, which helps reduce the weight of the battery pack cover and also strengthens the substrate layer 1. The second reinforcing layer 3 may also include a non-metallic material, for example, a glass fiber resin composite material. Exemplarily, the first reinforcing layer 2 and the second reinforcing layer 3 sandwich the substrate layer 1, which can transfer the impact force to the entire substrate layer 1 when impacted. The first reinforcing layer 2 and the second reinforcing layer 3 are connected, for example, by hot pressing or molding, and the substrate layer 1 is clamped and fixed.

[0044] The substrate layer 1 has a through hole 11. In one exemplary embodiment of this disclosure, the first reinforcing layer 2 has a protruding first connecting portion 21 on one side near the substrate layer 1. When the first reinforcing layer 2, the substrate layer 1, and the second reinforcing layer 3 are combined to form the battery pack cover, the first connecting portion 21 extends into the first hole 11 and connects with the second reinforcing layer 3. (See reference...) Figures 1 to 3 As shown, Figure 2 A schematic diagram of substrate layer 1 is shown. Figure 3 A schematic diagram is shown of the first reinforcing layer 2 near the substrate layer 1. The substrate layer 1 may have multiple through holes 11, and the first reinforcing layer 2 may have multiple first connecting portions 21, each corresponding to one of the first holes 11. This exemplary embodiment can reduce the weight of the substrate layer 1, which is beneficial for the overall weight reduction of the battery pack cover. Furthermore, it helps to further improve the strength of the connection between the first reinforcing layer 2 and the second reinforcing layer 3, as well as the strength of the clamping and fixing of the substrate layer 1 by the first reinforcing layer 2 and the second reinforcing layer 3.

[0045] For example, the depth to which the first connecting portion 21 extends into the first hole 11 is equal to the thickness of the substrate layer 1. That is, after the first reinforcing layer 2 is bonded to the substrate layer 1, the bottom surface of the first connecting portion 21 is flush with the bottom surface of the substrate layer 1. The side of the second reinforcing layer 3 closest to the substrate layer 1 can be flat, thereby simplifying the structure of the second reinforcing layer 3. The first reinforcing layer 2 and the second reinforcing layer 3 can be connected by hot pressing or molding, resulting in a relatively flat overall structure for the battery pack cover.

[0046] In one exemplary embodiment of this disclosure, both sides of the second reinforcing layer 3 in the Z direction are planar, thereby further simplifying the structure of the second reinforcing layer 3.

[0047] In one exemplary embodiment of this disclosure, the second reinforcing layer 3 has a protruding second connecting portion on one side near the substrate layer 1; when the second connecting portion is in contact with the substrate layer 1, the second connecting portion extends into the first hole 11 and connects with the first reinforcing layer 2.

[0048] For example, the depth to which the second connecting portion extends into the first hole 11 is equal to the thickness of the substrate layer 1, that is, after the second reinforcing layer 3 is attached to the substrate layer 1, the top surface of the second connecting portion is flush with the top surface of the substrate layer 1. The side of the first reinforcing layer 2 closest to the substrate layer 1 can be flat, thereby simplifying the structure of the first reinforcing layer 2.

[0049] In some exemplary embodiments of this disclosure, the first connecting portion 21 and the second connecting portion may also be provided simultaneously. Specifically, the substrate layer 1 has a through hole 11, the first reinforcing layer 2 has a protruding first connecting portion 21 on one side near the substrate layer 1, and the second reinforcing layer 3 has a protruding second connecting portion on one side near the substrate layer 1. The sum of the depth of the first connecting portion 21 extending into the first hole 11 and the depth of the second connecting portion extending into the first hole 11 can be equal to the thickness of the substrate layer 1. By connecting the first connecting portion 21 and the second connecting portion, the connection between the first reinforcing layer 2 and the second reinforcing layer 3 can be achieved.

[0050] The first reinforcing layer 2 is connected to the second reinforcing layer 3 to fix the substrate layer 1 between the first reinforcing layer 2 and the second reinforcing layer 3. In some exemplary embodiments of this disclosure, reference is made to... Figure 1 As shown, the orthographic projection of the substrate layer 1 along the thickness direction of the first reinforcing layer 2 is within the outer contour of the first reinforcing layer 2, and the orthographic projection of the substrate layer 1 along the thickness direction of the second reinforcing layer 3 is within the outer contour of the second reinforcing layer 3. The first reinforcing layer 2 and the second reinforcing layer 3 can be further connected by hot pressing or molding through the outer edge of the contour where the substrate layer 1 is not sandwiched, thereby improving the connection strength between the first reinforcing layer 2 and the second reinforcing layer 3, and enclosing the substrate layer 1 within the outer contour of the first reinforcing layer 2 and the second reinforcing layer 3.

[0051] In one exemplary embodiment of this disclosure, reference is made to Figure 1 , Figure 4 As shown, Figure 4 A schematic diagram shows the side of the first reinforcing layer 2 away from the substrate layer 1. The first reinforcing layer 2 includes an electrical component mounting area 23 and a welding area along the X direction; the side of the electrical component mounting area 23 away from the substrate layer 1 has a protruding first mounting portion 231. The first mounting portion 231 can be used to fix and install components related to the vehicle battery management system (BMS), such as high-voltage connectors, BMS main control modules, voltage sampling flexible circuit boards, temperature sensors, CAN communication modules, and various wiring harnesses. This exemplary embodiment, by setting the electrical component mounting area 23 in the first reinforcing layer 2 for fixing electrical components within the battery pack, eliminates the need for a traditional multi-functional fixing bracket for electrical components in the battery pack, which is beneficial for reducing battery pack weight and shortening the assembly dimension chain. Integrating the electrical component fixing points into the battery pack cover simplifies the process and reduces assembly difficulty. After the electrical components are installed in the first mounting portion 231, the maintenance cover 4 can be fastened to protect the electrical components in the electrical component mounting area 23; during the use of the battery pack, the maintenance cover 4 can be removed for quick inspection and maintenance of the electrical components. (Reference) Figure 5 As shown, the orthographic projection of the maintenance cover 4 onto the first reinforcing layer 2 along the thickness direction of the first reinforcing layer 2 can be located within the range of the electrical component mounting area 23, which also helps to reduce the volume of the maintenance cover 4 and the weight of the battery pack.

[0052] For example, the main wall thickness of the first reinforcing layer 2 can be 0.5-1.2 mm. The local wall thickness at the first mounting portion 231 (including the protruding portion of the first mounting portion 231 and the main wall thickness below the first mounting portion 231) can be 1.2-10 mm. For example, the main wall thickness of the electrical component mounting area 23 and the welding area can be the same. For example, the main wall thickness portion of the first reinforcing layer 2 (excluding the first mounting portion 231) can be a non-metallic composite material formed by continuously woven glass fiber and polyurethane or epoxy resin; the first mounting portion 231 can be a non-metallic composite material formed by long glass fiber and polyurethane or epoxy resin. For example, the first mounting portion 231 is a non-metallic composite material formed by glass fiber with a length of not less than 10 mm and polyurethane or epoxy resin. The protrusion height of the first mounting portion 231 can be 0-9 mm.

[0053] The orthographic projection of the substrate layer 1 onto the first reinforcing layer 2 along its thickness direction may be outside the electrical component mounting area 23. (Reference) Figure 1 , Figure 5As shown, the substrate layer 1 can be located outside the battery pack electrical component installation area. This is beneficial for the insulation of the electrical components. On the other hand, the electrical component installation area 23 is where electrical components are installed. It is usually a non-main load-bearing area of ​​the battery pack cover. The substrate layer 1 is located outside the electrical component installation area 23, which is beneficial for setting the shape and position of the substrate layer 1 according to the anti-collision protection requirements. This can reduce the weight of the battery pack cover under the same strength, or improve the anti-collision protection performance of the battery pack cover under the same weight.

[0054] refer to Figure 1 , Figure 5 As shown, the side of the electrical component mounting area 23 near the second reinforcing layer 3 is attached and connected to the side of the second reinforcing layer 3 near the first reinforcing layer 2. That is, the bottom surface of the electrical component mounting area 23 can be attached to the top surface of the second reinforcing layer 3. The second reinforcing layer 3 can improve the overall strength and rigidity of the electrical component mounting area 23, which is beneficial to improving the support force for the electrical component. In addition, the attachment of the electrical component mounting area 23 of the first reinforcing layer 2 to the second reinforcing layer 3 is also beneficial to further improve the firmness of the connection between the first reinforcing layer 2 and the second reinforcing layer 3. For example, the top and bottom surfaces of the second reinforcing layer 3 are both flat, and the second reinforcing layer 3 can be a non-metallic composite material formed by continuously woven glass fiber and polyurethane or epoxy resin. After the first reinforcing layer 2 and the second reinforcing layer 3 clamp and bond the substrate layer 1, the bonding strength between the first reinforcing layer 2 and the substrate layer 1 is not less than 5 MPa, and the bonding strength between the second reinforcing layer 3 and the substrate layer 1 is not less than 5 MPa.

[0055] In one exemplary embodiment of this disclosure, the substrate layer 1 includes a thinning region 12, and the first reinforcing layer 2 has a through-hole 24 for exposing at least a portion of the thinning region 12. The thinning region 12 can be a thinner area on the substrate layer 1; for example, the substrate layer 1 may include the thinning region 12 and a main body area other than the thinning region 12. The thickness of the main body area of ​​the substrate layer 1 can be 0.6-1 mm, and the thickness of the thinning region 12 can be 0-0.4 mm. The thinning region 12 and the third hole 24 can further reduce the weight of the battery pack cover. In some embodiments, refer to... Figures 1 to 5 As shown, the thickness of the thinning region 12 can be 0, the thinning region 12 can penetrate the substrate layer 1, the third hole 24 can penetrate the first reinforcing layer 2, and the thinning region 12 and the third hole 24 can expose the second reinforcing layer 3. In one embodiment, the battery pack cover in the area where the thinning region 12 and the third hole 24 are located can only have the second reinforcing layer 3, thereby ensuring the sealing and insulation function of the battery pack cover while achieving greater weight reduction. (Reference) Figure 1 , Figure 2As shown, the thinning region 12 is located within the edge of the substrate layer 1, thereby ensuring that there are no fracture zones on the X and Y direction edges of the substrate layer 1. The substrate layer 1 forms a complete frame structure with strong resistance to impact in the X and Y directions. For example, the first hole 11 is also located within the edge of the substrate layer 1.

[0056] In one exemplary embodiment of this disclosure, the first reinforcing layer 2 is provided with a through second hole 22, the second hole 22 being used to expose at least a portion of the main body area. (See reference...) Figures 4 to 5 As shown, for example, the projection of the second hole 22 along the Z-direction is located within the main body area. The main body area of ​​the substrate layer 1 exposed through the second hole 22 can be used to connect with the vehicle chassis. For example, the substrate layer 1 exposed through the second hole 22 can be welded to the vehicle floor, thereby enabling the battery pack cover to be integrated into the vehicle floor, forming a Cellto-Body (CTB) structure. As part of the vehicle body structure, the battery pack cover helps to enhance the torsional rigidity of the vehicle and the Y-direction collision safety, and also helps to reduce the chassis Z-direction space occupation, reduce the chassis thickness, improve wind resistance, and increase the interior Z-direction space.

[0057] For example, the battery pack cover is connected to the vehicle floor via a seat crossbeam; the seat crossbeam is used to weld the battery pack cover to the body area exposed through the second hole 22. (Reference) Figure 5 As shown, the seat crossbeam may include, for example, a rear floor crossbeam 51, a seat crossbeam 52, a foot pedal crossbeam 53, and a front bulkhead crossbeam 54. The rear floor crossbeam 51 is welded to the large casting of the vehicle's rear floor; the seat crossbeam 52 is welded to the bottom of the front seats; and the foot pedal crossbeam 53 and the front bulkhead crossbeam 54 are welded and fixed to the foot pedal and the front bulkhead of the vehicle, respectively. In this exemplary embodiment, the battery pack cover is integrated with the vehicle floor via the seat crossbeam, allowing the battery pack cover to bear vertical loads. The force on the seat crossbeam can be effectively transferred to the entire battery pack cover through the substrate layer 1, which is beneficial for optimizing the force path.

[0058] Specifically, the exposed substrate layer 1 of the battery pack cover can be glued to the seat crossbeam and then laser welded. (Reference) Figure 6 , Figure 7 , Figure 6 A schematic diagram of the overall battery pack is shown. Figure 7 A schematic diagram of the battery pack in a vehicle is shown. Specifically, Figure 7 The vehicle is represented by a frame in the diagram. The side closer to the service cover 4 represents the rear of the vehicle, and the side farther from the service cover 4 represents the front of the vehicle. The seat crossbeam 52 can be connected to the front seat, which helps to enhance the vehicle's safety in a Y-direction side impact. The third hole 24 on the first reinforcing layer 2 and the thinning area 12 on the substrate layer 1 together expose the second reinforcing layer 3.

[0059] According to a second aspect of this disclosure, a battery pack is also provided, including the battery pack cover of any of the foregoing, wherein a first reinforcing layer 2 is disposed on the side of the battery pack cover away from the battery module, referring to... Figure 1 , Figure 5 , Figure 6 as well as Figure 7 As shown. When the battery pack of this disclosure is installed in a vehicle, the second reinforcing layer 3 can be installed on the side close to the battery module, thereby ensuring electrical insulation between the battery module and the battery pack cover. The battery pack cover of this disclosure has a sandwich composite structure. The base material layer 1 can ensure the anti-collision protection function of the battery pack cover, and the first reinforcing layer 2 and the second reinforcing layer 3 can achieve the sealing and insulation functions of the battery pack cover. Therefore, the shape and position of the base material layer 1 can be specifically set according to the anti-collision protection requirements, reducing the weight of the battery pack under the same strength, or improving the anti-collision protection performance of the battery pack under the same weight.

[0060] According to another aspect of this disclosure, a vehicle is also provided, including the battery pack of any of the foregoing embodiments. The battery pack of this disclosure has good insulation performance, which is beneficial to the electrical safety of the vehicle. The battery pack cover is a sandwich composite structure, which can ensure the anti-collision protection function of the battery pack cover through the base material layer 1, and achieve the sealing and insulation functions of the battery pack cover through the first reinforcing layer 2 and the second reinforcing layer 3. Therefore, the shape and position of the base material layer 1 can be specifically set according to the anti-collision protection requirements, reducing the overall vehicle weight under the same strength, or improving the anti-collision protection performance of the battery pack under the same weight.

[0061] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A battery pack cover, characterized in that, It includes a first reinforcing layer (2), a substrate layer (1) and a second reinforcing layer (3) stacked sequentially along a first direction; at least the second reinforcing layer (3) is insulated; the substrate layer (1) is provided with a through hole (11), and the first reinforcing layer (2) and the second reinforcing layer (3) are connected at least through the first hole (11) to fix the substrate layer (1) between the first reinforcing layer (2) and the second reinforcing layer (3).

2. The battery pack cover according to claim 1, characterized in that, The substrate layer (1) comprises a metallic material.

3. The battery pack cover according to claim 1, characterized in that, The substrate layer (1) is provided with a plurality of first holes (11); the first reinforcing layer (2) is provided with a plurality of protruding first connecting portions (21) on one side near the substrate layer (1); when the first connecting portions (21) are in contact with the substrate layer (1), the first connecting portions (21) extend into the first holes (11) one by one and connect with the second reinforcing layer (3); and / or, The second reinforcing layer (3) has a plurality of protruding second connecting portions on one side near the substrate layer (1); when the second connecting portions are in contact with the substrate layer (1), the second connecting portions extend into the first hole (11) one by one and connect with the first reinforcing layer (2).

4. The battery pack cover according to claim 1, characterized in that, The substrate layer (1) includes a thinning region (12) and a main body region other than the thinning region (12), the thickness of the thinning region (12) being less than that of the main body region; the first reinforcing layer (2) has a through second hole (22), the second hole (22) exposing at least a portion of the main body region.

5. The battery pack cover according to claim 4, characterized in that, The battery pack cover is used to connect to the vehicle floor via the seat crossbeam; the seat crossbeam is used to weld to the battery pack cover to the main body area exposed in the second hole (22).

6. The battery pack cover according to claim 1, characterized in that, The substrate layer (1) includes a thinning region (12), and the first reinforcing layer (2) has a through third hole (24) that exposes at least a portion of the thinning region (12).

7. The battery pack cover according to claim 1, characterized in that, The orthographic projection of the substrate layer (1) onto the first reinforcing layer (2) along the thickness direction lies within the outer contour of the first reinforcing layer (2); the projection of the substrate layer (1) onto the second reinforcing layer (3) lies within the outer contour of the second reinforcing layer (3).

8. The battery pack cover according to claim 1, characterized in that, The first reinforcing layer (2) includes an electrical component mounting area (23) and a welding area along the second direction, which is perpendicular to the first direction; the electrical component mounting area (23) has a protruding first mounting portion (231) on one side away from the substrate layer (1).

9. The battery pack cover according to claim 8, characterized in that, The orthographic projection of the substrate layer (1) in the thickness direction of the first reinforcing layer (2) is outside the electrical component mounting area (23).

10. The battery pack cover according to claim 9, characterized in that, The side of the electrical component mounting area (23) near the second reinforcing layer (3) is attached to and connected to the side of the second reinforcing layer (3) near the first reinforcing layer (2).

11. The battery pack cover according to any one of claims 1 to 10, characterized in that, The first reinforcing layer (2) comprises a glass fiber resin composite material; and / or, the second reinforcing layer (3) comprises a glass fiber resin composite material.

12. The battery pack cover according to claim 3, characterized in that, The first reinforcing layer (2) has a protruding first connecting part (21) on one side near the substrate layer (1); the first connecting part (21) extends into the first hole (11) to a depth equal to the thickness of the substrate layer (1); the first connecting part (21) is connected to the second reinforcing layer (3).

13. The battery pack cover according to claim 12, characterized in that, Both sides of the second reinforcing layer (3) in the first direction are planar.

14. A battery pack, characterized in that, include: The battery pack cover according to any one of claims 1 to 13, wherein the first reinforcing layer (2) is disposed on the side of the battery pack cover away from the battery module.

15. A vehicle, characterized in that, Includes the battery pack as described in claim 14.

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