Upper cover structure of battery box body and battery pack

Abstract

The utility model provides an upper cover structure of a battery box body and a battery pack, and belongs to the field of battery manufacturing, the upper cover structure comprises an upper cover main body and a reinforcing plate assembly, the upper cover main body comprises a top cover and side covers, the side covers are fixedly connected to the two sides of the top cover, and a first preset included angle is formed between the side covers and the top cover; the reinforcing plate assembly is fixed in the upper cover body and comprises a first supporting plate and second supporting plates fixed to the two ends of the first supporting plate, the first supporting plate is transversely arranged between the two side covers and fixed to the surface of the top cover, and the second supporting plates are arranged at the corners of the side covers and the top cover; the second supporting plate is provided with the first connecting face and the second connecting face, the first preset included angle is formed between the first connecting face and the second connecting face, and the first supporting plate and the second supporting plate are matched together to form powerful supporting, so that the strength and the stability of the upper cover of the battery pack box are improved, and the safety and the reliability of the battery pack are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of battery manufacturing, in particular to a battery box upper cover structure and a battery pack. BACKGROUND

[0002] Energy saving and emission reduction will inevitably become the main direction of future automobile development, and developing electric vehicles will be the best way to solve the two technical difficulties. The growing market for electric vehicles has driven up demand for related parts. The core component of an electric vehicle is a power battery pack, and the power battery pack upper cover is an important part of the power battery, which plays a very important protective role for the battery module. With the increasing demand for endurance mileage of commercial heavy truck vehicles, the power battery pack needs to meet higher energy demands, therefore, the battery pack box structure will be larger, at the same time, the strength of the upper cover structure of the battery box will not be guaranteed with the increase in volume, if the structural strength of the upper cover structure of the battery box cannot meet the requirements, stress concentration will occur, resulting in failure of the battery pack.

[0003] Therefore, it is urgent to provide a battery box upper cover structure and a battery pack, so that the structural strength of the battery box upper cover structure can meet the requirements while improving the service life of the battery pack. CONTENT OF THE INVENTION

[0004] The application provides a battery box upper cover structure and a battery pack to solve the strength problem of the battery box upper cover structure, enhance the load-bearing capacity and deformation resistance of the upper cover structure, and thus improve the safety and reliability of the battery pack.

[0005] In a first aspect, the application provides a battery box upper cover structure, comprising: an upper cover body, the upper cover body comprising a top cover and side covers, the side covers being fixedly connected to the two sides of the top cover, and the side covers and the top cover forming a first preset included angle; a reinforcing plate assembly fixedly connected to the inside of the upper cover body, the reinforcing plate assembly comprising a first support plate and second support plates fixed to the two ends of the first support plate, the first support plate being horizontally arranged between the two side covers and fixed to the surface of the top cover, and the second support plates being arranged at the corners of the side covers and the top cover, wherein the second support plates have first connecting surfaces and second connecting surfaces, the first connecting surfaces and the second connecting surfaces forming the first preset included angle, the first connecting surfaces being fixed to the top cover and the first support plate, and the second connecting surfaces being fixed to the side covers.

[0006] By the above scheme, the upper cover body is the main part of the battery pack upper cover, including a top cover and a side cover. The side cover is fixedly connected to the two sides of the top cover and forms a first preset included angle with each other, so that it can be covered on the battery lower box body. The second support plate is arranged at the corner of the side cover and the top cover, and has two connecting surfaces: a first connecting surface and a second connecting surface. A preset angle, i.e. a first preset included angle, is formed between the two connecting surfaces. Since the second support plate is arranged at the corner of the side cover and the top cover, the internal corner of the upper cover structure is strongly supported. At the same time, since the first support surface is transversely arranged between the two side covers and fixed to the surface of the top cover, the first support plate and the second support plate cooperatively form a strong support, thereby improving the strength and stability of the battery pack upper cover, and ensuring a structural transition between the side cover and the top cover for easy installation and maintenance. By using the reinforcing plate assembly, the load-bearing capacity and deformation resistance of the upper cover can be enhanced, thereby improving the safety and reliability of the battery pack.

[0007] In a possible design, the width of the first connecting surface is greater than 5mm, where the width of the first connecting surface is the dimension of the first connecting surface in the direction perpendicular to the edge of the side cover.

[0008] By the above scheme, increasing the width of the first connecting surface can increase the contact area between the first connecting surface and the top cover and the first support plate, thereby improving the reliability of the connection. Here, the width of the first connecting surface is greater than 5mm to ensure the welding connection with the top cover. The width of the first connecting surface is very important for the ability to withstand the internal pressure of the battery pack and external impact.

[0009] In a possible design, the second connecting surface has a first side edge for connecting with the first connecting surface, and a second side edge away from the first connecting surface. The second side edge and the outer side edge of the side cover have a reserved gap therebetween, and the distance of the reserved gap is at least greater than 25mm.

[0010] By the above scheme, the purpose of the reserved gap between the second side edge and the outer side edge of the side cover being at least 25mm is to cooperate with the structure arranged on the lower box body during installation, thereby ensuring better installation of the upper cover structure.

[0011] In a possible design, at least three welding points are arranged on the second connecting surface at the position of the second side edge.

[0012] By the above scheme, the welding connection between the second connecting surface and the side cover can ensure the structural strength. However, the position of the second side edge of the second connecting surface must be welded to ensure that stress is not concentrated and the strength requirement is met. At least three welding points arranged on the second connecting surface at the position of the second side edge can maximize the strength of the side cover.

[0013] In a possible design, the first support plate is provided with first preset welding points, and the first support plate is welded to the inner surface of the upper cover body through the first preset welding points. The first preset welding points include a first support middle welding point area, a first support body welding point area, and a first support end welding point area. The first support middle welding point area is located in the central region of the first support plate. The first support end welding point area is the welding point in the region overlapping the first connecting surface. The first support body welding point area is the welding point in the region within a range of 80-100 mm from the first support end welding point area.

[0014] Through the above scheme, the first preset welding points include three parts, i.e., the first support middle welding point area, the first support body welding point area, and the first support end welding point area. This design helps to evenly distribute the welding points on the entire first support plate, thereby improving the overall stability and strength of the structure. The first support middle welding point area is located in the central region of the first support plate. This layout can provide additional support to reduce the bending or deformation of the first support plate when under stress, and also helps to disperse the welding stress. The first support end welding point area is the welding point in the region overlapping the first connecting surface, which means that they are located in the edge region of the first support plate in contact with the first connecting surface. This design helps to firmly fix the first support plate on the first connecting surface, enhancing the connection strength of the entire structure. The first support body welding point area is located in the region within a range of 80-100 mm from the first support end welding point area. The selection of this range may be based on a comprehensive consideration of factors such as structural strength, feasibility of welding process, and thermal expansion. This layout helps to provide additional welding connection points in the main body part of the first support plate to enhance the stability of the structure. During manufacturing, the size of the first support plate and the position of the welding points need to be precisely controlled to ensure the quality of welding and the stability of the structure. This may require high-precision machining techniques and strict quality control. By evenly distributing and setting the welding points on the first support plate, the uniform stress of the entire structure can be ensured, and local stress concentration can be reduced, thereby improving the durability and reliability of the entire battery pack upper cover.

[0015] In a possible design, the number of first support middle welding point areas is at least 4, and the 4 first support middle welding point areas are distributed in at least two rows. The number of first support body welding point areas is at least 2, and the first support body welding point areas are distributed along the length direction of the first support plate. The first support end welding point areas are used to fix and weld the first connecting surface to the first support plate, and the number of first support end welding point areas is 2.

[0016] By the above scheme, the number of first support middle welding point areas is at least 4, which helps to provide sufficient welding points to enhance the connection strength of the first support plate and the inner surface of the upper cover body. These 4 first support middle welding point areas are distributed into at least two rows, which can ensure that the welding stress is evenly distributed in the central area of the first support plate, reducing local stress concentration and improving the overall stability of the structure. The number of first support main body welding point areas is at least 2, which helps to provide sufficient welding points in the main body part of the first support plate to ensure the stability of the structure. The first support main body welding point areas are distributed along the length direction parallel to the first support plate, which can ensure uniform welding connection in the main body part of the first support plate and enhance the carrying capacity of the main body part of the first support plate. The number of first support end welding point areas is 2, which helps to provide sufficient welding points in the end area of the first support plate to ensure firm connection with the first connecting surface. The first support end welding point areas are used to fix and weld the first connecting surface on the first support plate, which helps to enhance the connection strength between the first connecting surface and the first support plate and ensure the stability of the structure. The number and distribution of welding points affect the weight and strength of the upper cover structure, and the precise position of the welding points can ensure the welding quality and the stability of the structure. By arranging a sufficient number of welding points in different areas of the first support plate, the stability and carrying capacity of the entire upper cover structure can be improved, which is very important for the safety and reliability of the battery pack.

[0017] In a possible design, the first connecting surface is provided with second preset welding points and third preset welding points, the second preset welding points are used to fix and weld the first connecting surface on the first support plate, and the third preset welding points are used to fix and weld the first connecting surface on the top cover.

[0018] By the above scheme, the second preset welding points are used to fix and weld the first connecting surface on the first support plate. This design helps to ensure firm connection between the first connecting surface and the first support plate and enhance the stability of the entire structure. These welding points are evenly distributed in the area where the first connecting surface contacts the first support plate to ensure uniform stress distribution and sufficient connection strength. The third preset welding points are used to fix and weld the first connecting surface on the top cover. This design helps to ensure firm connection between the first connecting surface and the top cover and further enhance the stability of the entire upper cover structure. These welding points are also evenly distributed in the area where the first connecting surface contacts the top cover to ensure uniform stress distribution and sufficient connection strength.

[0019] In a possible design, the second preset welding points and the third preset welding points are located on the same straight line, and the number of second preset welding points is 2 and the number of third preset welding points is at least two.

[0020] By the above scheme, the second preset welding point and the third preset welding point are located on the same straight line, which can be understood as a collinear layout of the welding points, which can ensure the symmetry in the welding process and help reduce the distortion or deformation caused by welding. The number of the second preset welding points is 2, which can provide sufficient connection strength while maintaining the simplicity of the welding process. The second preset welding points are used to fixedly weld the first connecting surface on the first support plate, ensuring the firm connection between the first connecting surface and the first support plate. The number of the third preset welding points is at least 2, which helps to provide sufficient welding points to enhance the connection strength between the first connecting surface and the top cover. The third preset welding points are used to fixedly weld the first connecting surface on the top cover, ensuring the firm connection between the first connecting surface and the top cover. By evenly distributing the welding points on the first connecting surface, the uniform stress of the entire structure can be ensured, and the local stress concentration can be reduced, thereby improving the durability and reliability of the entire battery pack upper cover.

[0021] In a possible design, the first preset included angle is 90 degrees, the number of the reinforcement plate assemblies is an odd number, and the reinforcement plate assemblies are evenly distributed in the length direction of the upper cover body.

[0022] By the above scheme, the first preset included angle is 90 degrees, which means that the side cover and the top cover form a right angle, and at the same time, the second connecting surface and the first connecting surface form a right angle. This design can provide maximum structural stability because the right angle is the most stable angle in geometry, so the upper cover structure is also more stable. An odd number of reinforcement plate assemblies is selected to ensure that there is a center of symmetry in the length direction of the upper cover body, which helps to improve the symmetry and balance of the structure. By evenly distributing the reinforcement plate assemblies in the length direction of the upper cover body, the stability and load-bearing capacity of the entire upper cover structure can be improved, which is very important for the safety and reliability of the battery pack. The odd number of reinforcement plate assemblies and the 90-degree preset included angle help to achieve the symmetry and balance of the structure, which is particularly important for large structures or applications that require uniform distribution of weight and pressure. This design takes into account the structural strength, symmetry, and ease of maintenance, aiming to provide a battery pack upper cover structure that is both strong and reliable. By evenly distributing the reinforcement plate assemblies in the length direction of the upper cover body, the uniform stress of the entire structure can be ensured, and the local stress concentration can be reduced, thereby improving the durability and reliability of the entire battery pack upper cover.

[0023] In a second aspect, the application provides a battery pack, comprising a battery lower box body and an upper cover structure of the battery box body according to any one of the above.

[0024] The battery pack provided in the above second aspect and each possible design of the above second aspect can refer to the beneficial effects brought by the first aspect and each possible implementation of the first aspect, which will not be repeated here.

[0025] The above description is only a summary of the technical solutions of the embodiments of the present application. In order to make the technical means of the embodiments of the present application more clearly understood, and to be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Figure 1 The schematic diagram of the battery box and the upper cover structure thereof provided in an embodiment of the present application.

[0028] Figure 2 The schematic diagram of the upper cover structure of the battery box provided in an embodiment of the present application.

[0029] Figure 3 The schematic diagram of the reinforcing plate assembly of the upper cover structure of the battery box provided in an embodiment of the present application.

[0030] Figure 4 Another perspective view of the upper cover structure of the battery box provided in an embodiment of the present application.

[0031] Figure 5 The partial enlarged view of Figure 4

[0032] Figure 6 The schematic diagram of the reinforcing plate assembly of the upper cover structure of the battery box provided in an embodiment of the present application.

[0033] Explanation of reference signs:

[0034] 10, upper cover structure; 20, lower battery box; 21, sealing ring; 100, top cover; 110, side cover; 120, reinforcing plate assembly; 121, first support plate; 122, first connecting surface; 123, second connecting surface; 210, first support middle welding point area; 220, first support main body welding point area; 230, first support end welding point area; 310, second side edge welding area; L1, first straight line; L2, second straight line. DETAILED DESCRIPTION

[0035] ​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall into the scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including," "comprising," "having" and "with" and variations thereof in the specification and claims herein is intended to be open, and mean that there are equivalents.

[0037] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. A person of ordinary skill in the art will understand that an embodiment described herein can be combined with another embodiment.

[0038] The term "and / or", merely used as a description of associated objects, means that there are three kinds of relations, for example, A and / or B, which means that there are three cases of A, A and B, and B. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0039] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects, and are not used to describe a specific order, and can explicitly or implicitly include one or more of the features.

[0041] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" refers to more than two (including two), and similarly, "a plurality of groups" refers to more than two groups (including two groups).

[0042] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of mechanical structure can mean physical connection, such as fixed connection, for example, fixed connection by spacer, such as fixed connection by screw, bolt or other spacer; the physical connection can also be detachable connection, such as mutual clamping or clamping connection; the physical connection can also be integrally connected, such as welding, bonding or integrally formed connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] At present, with the increasing demand of commercial heavy truck for endurance mileage, the original battery box can not meet the demand of energy, so as to develop new products, the battery pack with greater energy and greater energy density means that the overall battery pack is longer, for example, the length of the battery pack can reach more than 2.2 meters, therefore, the length of the corresponding upper cover structure of the battery box also needs to reach more than 2 meters. However, the upper cover structure with a length of more than 2 meters has a high cost of composite material mold, so it is difficult to meet the use of the upper cover structure in the early stage by using ordinary mold opening mode.

[0044] In the related art, the upper cover structure uses sheet metal material, and the sheet metal material is directly welded into the upper cover structure corresponding to the bending structure capable of covering the battery lower box. However, due to the long length, the middle part of the upper cover structure of this scheme cannot meet the requirements of the structure strength, especially the stress concentration at the middle position of the main body will cause the battery pack to fail.

[0045] Therefore, the upper cover structure of the battery box and the battery pack are provided in the embodiments of the present application. The reinforcing plate assembly is arranged in the main body of the upper cover structure, the reinforcing plate assembly is composed of a first supporting plate and a second supporting plate, and the second supporting plate is composed of a first connecting surface and a second connecting surface. The first supporting surface is transversely arranged between the two side covers and fixed on the surface of the top cover. The first supporting plate and the second supporting plate cooperate to form a strong support, improve the strength and stability of the upper cover of the battery pack box, and ensure a structural transition between the side cover and the top cover for easy installation and maintenance. By using the reinforcing plate reinforcing plate assembly, the load-bearing capacity and deformation resistance of the upper cover can be enhanced, thereby improving the safety and reliability of the battery pack.

[0046] In order to make the person in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings.

[0047] Figure 1 The battery box and the upper cover structure thereof provided in the present embodiment are shown in the schematic diagram. Figure 2 The battery box and the upper cover structure thereof provided in the present embodiment are shown in the schematic diagram. Figure 3 The reinforcing plate assembly of the upper cover structure of the battery box provided in the present embodiment is shown in the schematic diagram. Please refer to Figure 1 、 Figure 2 and Figure 3 The upper cover structure 10 of the battery box provided in the present embodiment comprises an upper cover main body and a reinforcing plate assembly 120 fixed in the upper cover main body.

[0048] The upper cover main body comprises a top cover 100 and side covers 110 fixedly connected on both sides of the top cover 100, and the side covers 110 form a first preset included angle with the top cover 100.

[0049] The top cover 100 and the side covers 110 can be sheet metal materials with a thickness less than 1.5 mm. The top cover 100 can be rectangular, and the side covers 110 are rectangular. The long side of the side covers 110 corresponds to the long side of the top cover 100, and the long side of the side covers 110 is fixedly connected with the long side of the top cover 100. In the present embodiment, the side covers 110 and the top cover 100 are connected by welding.

[0050] Please refer to Figure 1 The upper cover structure 10 forms a cavity, which can be covered on the lower battery box 20, and a sealing ring 21 is arranged at the joint of the upper cover structure 10 and the lower battery box 20 to form a seal, so as to accommodate and protect the battery module.

[0051] In the present embodiment, the first preset included angle is 90 degrees, that is, the side covers 110 form a right angle with the top cover 100. This design can provide the maximum structural stability, because the right angle is the most stable angle in geometry, and therefore the upper cover structure 10 is more stable.

[0052] The reinforcing plate assembly 120 is fixed in the inside of the upper cover main body, and is used to support the upper cover structure 10.

[0053] The reinforcing plate assembly 120 comprises a first support plate 121 and second support plates fixed at both ends of the first support plate 121, the first support plate 121 is horizontally arranged between the two side covers 110 and is fixed on the surface of the top cover 100, and the second support plates are arranged at the corners of the side cover 110 and the top cover 100, wherein the second support plates have first connecting surfaces 122 and second connecting surfaces 123, the first connecting surfaces 122 and the second connecting surfaces 123 form a first preset included angle, the first connecting surfaces 122 are fixed on the top cover 100 and the first support plate 121, and the second connecting surfaces 123 are fixed on the side cover 110.

[0054] The first support plate 121 can be rectangular, wherein the long side of the first support plate 121 is horizontally arranged in the top cover 100, and the length of the first support plate 121 is equal to the width of the top cover 100.

[0055] The second support plate is composed of the first connecting surfaces 122 and the second connecting surfaces 123, the first connecting surfaces 122 are rectangular, the second connecting surfaces 123 are rectangular, the length of the first connecting surfaces 122 is equal to the length of the second connecting surfaces 123, both ends of the first support plate 121 are welded and fixed with the first connecting surfaces 122, and the end of the first support plate 121 can abut against the inner wall surface of the second connecting surfaces 123. The inner wall surface of the second connecting surfaces 123 is the side facing the first support plate 121, and the other side of the second connecting surfaces 123 away from the first support plate 121 can be welded and fixed with the side cover 110.

[0056] The first connecting surfaces 122 and the second connecting surfaces 123 form a first preset included angle, which means that the corner of the first connecting surfaces 122 and the second connecting surfaces 123 is the same as the corner of the top cover 100 and the side cover 110, therefore, the first preset included angle is 90 degrees, which also means that the second connecting surfaces 123 and the first connecting surfaces 122 form a right angle.

[0057] Through the above scheme, the upper cover body is the main part of the battery pack upper cover, including two parts of the top cover 100 and the side cover 110. The side cover 110 is fixedly connected on both sides of the top cover 100, and forms a first preset included angle with each other, so that it can be covered on the battery lower box body 20. The second support plate is arranged at the corner of the side cover 110 and the top cover 100, and has two connecting surfaces: the first connecting surface 122 and the second connecting surface 123. A preset angle, i.e. the first preset included angle, is also formed between the two connecting surfaces. Since the second support plate is arranged at the corner of the side cover 110 and the top cover 100, the internal corner of the upper cover structure 10 is strongly supported. At the same time, since the first support surface is transversely arranged between the two side covers 110 and fixed on the surface of the top cover 100, the first support plate 121 and the second support plate cooperatively form a strong support, thereby improving the strength and stability of the battery pack box upper cover, and ensuring a structural transition between the side cover 110 and the top cover 100, so as to facilitate installation and maintenance. Through the use of the reinforcing plate assembly 120, the load-bearing capacity and deformation resistance of the upper cover can be enhanced, thereby improving the safety and reliability of the battery pack.

[0058] In this embodiment, the number of reinforcing plate assemblies 120 is odd, and the reinforcing plate assemblies 120 are evenly distributed in the length direction of the upper cover body.

[0059] The odd number of reinforcing plate assemblies 120 ensures that a reinforcing plate assembly is arranged at the middle position, thereby ensuring the strength of the central position of the upper cover structure 10. In particular, electrical elements can be arranged in the internal box at the central position, and the arrangement of the reinforcing plate assembly at this position greatly improves the reliability of the battery pack. In addition, the odd number of reinforcing plate assemblies 120 is selected to ensure that there is a central symmetry point in the length direction of the upper cover body, which helps to improve the symmetry and balance of the structure. By evenly distributing the reinforcing plate assemblies 120 in the length direction of the upper cover body, the stability and load-bearing capacity of the entire upper cover structure 10 can be improved, which is very important for the safety and reliability of the battery pack. The odd number of reinforcing plate assemblies 120 and the 90-degree preset included angle help to achieve the symmetry and balance of the structure, which is particularly important for large structures or applications that require uniform distribution of weight and pressure. This design takes into account the structural strength, symmetry and maintenance convenience, aiming to provide a battery pack upper cover structure 10 that is both strong and reliable. By evenly distributing the reinforcing plate assemblies 120 in the length direction of the upper cover body, uniform stress distribution of the entire structure can be ensured, and local stress concentration can be reduced, thereby improving the durability and reliability of the entire battery pack box upper cover.

[0060] Figure 4 Another perspective view of the upper cover structure 10 of the battery box provided in this embodiment. Please refer to Figure 3 and Figure 4The width of the first connecting surface 122 is greater than 5mm, wherein the width of the first connecting surface 122 is the dimension of the first connecting surface 122 in the direction perpendicular to the edge of the side cover 110. Since the first connecting surface 122 is rectangular, the width of the first connecting surface 122 is the dimension of the short side thereof.

[0061] By the above scheme, increasing the width of the first connecting surface 122 can increase the contact area between the first connecting surface 122 and the top cover 100 and the first support plate 121, thereby improving the reliability of the connection. Here, the width of the first connecting surface 122 is greater than 5mm to ensure the welding connection with the top cover 100, and the width of the first connecting surface 122 is very important to the ability to withstand the pressure from the inside of the battery pack and external impact.

[0062] Please continue to refer to Figure 4 The second connecting surface 123 has a first side edge for connecting with the first connecting surface 122, and a second side edge away from the first connecting surface 122, the second side edge is located on the first straight line L1, and the second side edge and the outer side edge of the side cover 110 have a reserved gap, the outer side edge of the side cover 110 is located on the second straight line L2, and the distance of the reserved gap is at least greater than 25mm, that is, the straight line distance between L1 and L2 is at least greater than 25mm.

[0063] By the above scheme, the purpose of the reserved gap between the second side edge and the outer side edge of the side cover 110 being at least 25mm is to cooperate with the structure provided on the lower box body when installed with the lower box body, thereby ensuring better installation of the upper cover structure 10.

[0064] Figure 5 For Figure 4 is a partial enlarged view of the second connecting surface 123. Figure 6 is a schematic view of the welding points of the reinforcing plate assembly 120 of the upper cover structure 10 of the battery box provided in the embodiment. Please refer to Figure 4 , Figure 5 and Figure 6 The second connecting surface 123 has a second side edge welding area 310, the welding points of the second side edge welding area 310 are used for welding the second side edge on the side cover 110, and the number of welding points of the second side edge welding area 310 is at least 3.

[0065] In the embodiment, the welding points of the second side edge welding area 310 are uniformly distributed on the same straight line.

[0066] By the above scheme, the welding connection of the second connecting surface 123 and the side cover 110 can ensure the structural strength, but the position of the second side edge of the second connecting surface 123 must be welded to ensure that the stress will not be concentrated and the strength requirement, and at least 3 welding points are provided along the position of the second side edge on the second connecting surface 123 to maximize the strength of the side cover 110.

[0067] Please continue to refer to Figure 4 、 Figure 5 and Figure 6 In this embodiment, the first support plate 121 is provided with first preset welding points, and the first support plate 121 is welded to the inner surface of the upper cover body through the first preset welding points, wherein the first preset welding points include a first support middle welding point area 210, a first support body welding point area 220, and a first support end welding point area 230. The first support middle welding point area 210 is located in the central region of the first support plate 121, the first support end welding point area 230 is the welding point in the overlapping area with the first connecting surface 122, and the first support body welding point area 220 is the welding point in the area within the range of 80mm-100mm from the first support end welding point area 230.

[0068] Through the above scheme, the first preset welding points include three parts, namely the first support middle welding point area 210, the first support body welding point area 220, and the first support end welding point area 230. This design helps to evenly distribute the welding points on the entire first support plate 121, to improve the overall stability and strength of the structure. Among them, the first support middle welding point area 210 is located in the central region of the first support plate 121. This layout can provide additional support to reduce the bending or deformation of the first support plate 121 when under stress, and also helps to disperse the welding stress. The first support end welding point area 230 is the welding point in the overlapping area with the first connecting surface 122, which means they are located in the edge area where the first support plate 121 contacts the first connecting surface 122. This design helps to firmly fix the first support plate 121 on the first connecting surface 122, enhancing the connection strength of the entire structure. The first support body welding point area 220 is located in the area within the range of about 80mm to 100mm from the first support end welding point area 230. The selection of this range may be based on a comprehensive consideration of factors such as structural strength, feasibility of welding process, and thermal expansion. This layout helps to provide additional welding connection points in the main body part of the first support plate 121 to enhance the stability of the structure. During manufacturing, the size of the first support plate 121 and the position of the welding points need to be precisely controlled to ensure the quality of welding and the stability of the structure. This may require high-precision machining technology and strict quality control. By evenly distributing and setting the welding points on the first support plate 121, the uniform stress of the entire structure can be ensured, and the local stress concentration can be reduced, thereby improving the durability and reliability of the entire battery pack upper cover.

[0069] In this embodiment, the number of first support middle solder point areas 210 is at least 4, and the 4 first support middle solder point areas 210 are distributed in at least two rows; the number of first support main body solder point areas 220 is at least 2, and the first support main body solder point areas 220 are distributed along the length direction parallel to the first support plate 121; the first support end solder point area 230 is used to fix and weld the first connecting surface 122 on the first support plate 121, and the number of first support end solder point areas 230 is 2.

[0070] It can be understood that in this embodiment, whether the above-mentioned solder points are arranged in a single row or a double row, the solder points in each of the above-mentioned areas can be uniformly distributed.

[0071] In the above-mentioned scheme, the number of first support middle solder point areas 210 is at least 4, which helps to provide enough welding points to enhance the connection strength of the first support plate 121 and the inner surface of the upper cover main body. The 4 first support middle solder point areas 210 are distributed in at least two rows, which can ensure that the welding stress is uniformly distributed in the central area of the entire first support plate 121, reduce local stress concentration, and improve the overall stability of the structure. The number of first support main body solder point areas 220 is at least 2, which helps to provide enough welding points in the main body part of the first support plate 121 to ensure the stability of the structure. The first support main body solder point areas 220 are distributed along the length direction parallel to the first support plate 121, which can ensure uniform welding connection in the main body part of the first support plate 121 and enhance the carrying capacity of the main body part of the first support plate 121. The number of first support end solder point areas 230 is 2, which helps to provide enough welding points in the end area of the first support plate 121 to ensure firm connection with the first connecting surface 122. The first support end solder point area 230 is used to fix and weld the first connecting surface 122 on the first support plate 121, which helps to enhance the connection strength between the first connecting surface 122 and the first support plate 121 and ensure the stability of the structure. The number and distribution of welding points affect the weight and strength of the upper cover structure 10, and the precise position of the welding points can ensure the welding quality and the stability of the structure. By arranging a sufficient number of welding points in different areas of the first support plate 121, the stability and carrying capacity of the entire upper cover structure 10 can be improved, which is very important for the safety and reliability of the battery pack.

[0072] In one embodiment, the first connecting surface 122 is provided with a second predetermined solder point and a third predetermined solder point, the second predetermined solder point is used to fix and weld the first connecting surface 122 on the first support plate 121, and the third predetermined solder point is used to fix and weld the first connecting surface 122 on the top cover 100.

[0073] It can be understood that the second preset welding point in the embodiment and the first support end welding point area 230 in the above are both used to fix and weld the first connecting surface 122 on the first support plate 121. The welding point can be provided on the first connecting surface 122 as the second preset welding point, or the welding point can be provided on the first support plate 121 as the first support end welding point area 230.

[0074] Through the above scheme, the second preset welding point is used to fix and weld the first connecting surface 122 on the first support plate 121. This design helps to ensure the firm connection between the first connecting surface 122 and the first support plate 121, and enhances the stability of the entire structure. These welding points are evenly distributed in the area where the first connecting surface 122 contacts the first support plate 121, to ensure uniform stress distribution and sufficient connection strength. The third preset welding point is used to fix and weld the first connecting surface 122 on the top cover 100. This design helps to ensure the firm connection between the first connecting surface 122 and the top cover 100, further enhancing the stability of the entire top cover structure 10. These welding points are also evenly distributed in the area where the first connecting surface 122 contacts the top cover 100, to ensure uniform stress distribution and sufficient connection strength.

[0075] In an embodiment, the second preset welding point and the third preset welding point are located on the same line, and the number of the second preset welding points is two, and the number of the third preset welding points is at least two.

[0076] Through the above scheme, the second preset welding point and the third preset welding point are located on the same line, which can be understood as a collinear layout of the welding points, which can ensure the symmetry during welding and help to reduce distortion or deformation caused by welding. The number of the second preset welding points is two, which can provide sufficient connection strength while maintaining the simplicity of the welding process. The second preset welding point is used to fix and weld the first connecting surface 122 on the first support plate 121, ensuring the firm connection between the first connecting surface 122 and the first support plate 121. The number of the third preset welding points is at least two, which helps to provide sufficient welding points to enhance the connection strength between the first connecting surface 122 and the top cover 100. The third preset welding point is used to fix and weld the first connecting surface 122 on the top cover 100, ensuring the firm connection between the first connecting surface 122 and the top cover 100. By evenly distributing the welding points on the first connecting surface 122, the uniform stress of the entire structure can be ensured, and the local stress concentration can be reduced, thereby improving the durability and reliability of the entire battery pack box top cover.

[0077] Based on the upper cover structure 10 of the battery box in the above embodiments, the present embodiment also provides a battery pack, which comprises a battery lower box 20 and the upper cover structure 10 of the battery box of any one of the above embodiments, the upper cover structure 10 covers the battery lower box 20 to form a containing cavity for containing a battery module, and a sealing ring 21 is located at the contact position of the upper cover structure 10 and the battery lower box 20 to ensure the sealing of the battery pack.

[0078] Since the upper cover structure 10 of the battery box and its beneficial effects have been described in detail in the foregoing embodiments, the present application will not be described here again.

[0079] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A structure of an upper cover of a battery case, characterized by comprising: The utility model relates to a kind of upper cover, including: Upper cover body, the upper cover body includes top cover and side cover, the side cover is fixedly connected in the two sides of the top cover, the side cover forms first preset angle with the top cover; Reinforcing plate assembly, the reinforcing plate assembly is fixed in the inside of the upper cover body, the reinforcing plate assembly includes first support plate and second support plate fixed in the two ends of the first support plate, the first support plate is transversely arranged between two side covers, and is fixed on the surface of the top cover, the second support plate is arranged at the corner of the side cover and the top cover, wherein the second support plate has first connecting surface and second connecting surface, The first connecting surface and the second connecting surface form first preset angle, the first connecting surface is fixed on the top cover and the first support plate, and the second connecting surface is fixed on the side cover.

2. The upper cover structure of the battery case according to claim 1, wherein The width of the first connecting surface is greater than 5mm, wherein the width of the first connecting surface is the size of the first connecting surface in the direction perpendicular to the edge of the side cover.

3. The upper cover structure of the battery case according to claim 2, wherein The second connecting surface has a first side edge for connecting with the first connecting surface, and a second side edge away from the first connecting surface, the second side edge and the outer side edge of the side cover have a reserved gap, and the distance of the reserved gap is at least greater than 25mm.

4. The upper cover structure of the battery case according to claim 3, wherein The second connecting surface has a second side edge welding area, and welding points are arranged in the second side edge welding area for welding the second side edge to the side cover; the number of welding points in the second side edge welding area is at least 3.

5. The upper cover structure of the battery case according to claim 2, wherein The first support plate is provided with first preset welding points, and the first support plate is welded to the inner surface of the upper cover body through the first preset welding points, wherein the first preset welding points include a first support middle welding point area, a first support body welding point area, and a first support end welding point area, the first support middle welding point area is located in the central region of the first support plate, the first support end welding point area is the welding point in the overlapping region with the first connecting surface, and the first support body welding point area is the welding point in the region within a range of 80mm-100mm from the first support end welding point area.

6. The upper cover structure of the battery case according to claim 5, wherein The number of the first support middle welding point area is at least 4, and the 4 first support middle welding point areas are distributed in at least two rows; the number of the first support body welding point area is at least 2, and the first support body welding point areas are distributed along the length direction parallel to the first support plate; the first support end welding point area is used for fixedly welding the first connecting surface to the first support plate, and the number of the first support end welding point area is 2.

7. The upper cover structure of the battery case according to claim 2, wherein The first connecting surface is provided with second preset welding points and third preset welding points, the second preset welding points are used for fixedly welding the first connecting surface to the first support plate, and the third preset welding points are used for fixedly welding the first connecting surface to the top cover.

8. The upper cover structure of the battery case according to claim 7, wherein The second preset welding points and the third preset welding points are located on the same straight line, and the number of the second preset welding points is 2, and the number of the third preset welding points is at least two.

9. The upper cover structure of the battery case according to claim 1, wherein The first preset included angle is 90 degrees, the number of the reinforcing plate assemblies is odd, and the reinforcing plate assemblies are evenly distributed in the length direction of the upper cover body.

10. A battery pack, characterized by, The upper cover structure of the battery box body and the battery box body according to any one of claims 1-9.

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