Upper cover structure of power battery pack and power battery

Abstract

The utility model provides an upper cover structure of a power battery pack and a power battery, and belongs to the field of power battery manufacturing, an upper cover plate is designed to be broken apart from two sides along a first central axis as a bisector, so that two side cover plates can be properly opened towards the outer side, and the power battery pack is more convenient to use. Therefore, when the upper cover structure vertically covers the battery lower box body, the phenomenon that the sealing ring deviates due to friction between the upper cover structure and the sealing ring on the battery lower box body is avoided, so that the sealing performance in the mounting process is well guaranteed. Meanwhile, the design that the first plane is flush with the top cover plate ensures that the upper cover structure cannot be hindered when being opened, and the design that the first plane and the transition surfaces on the two sides form a flat top structure can be matched with the corresponding bulge design on the lower box body for installation, so that the positioning of the upper cover structure and the battery lower box body in the installation process is facilitated, and the installation efficiency is improved. The installation convenience and efficiency can be improved, and the sealing performance and firmness of the battery pack can be enhanced.

Description

TECHNICAL FIELD

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

[0002] With the global shortage of oil energy and the aggravation of environmental pollution hazards, 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 of electric vehicles and the increasing demand for related parts drive the demand for core components of electric vehicles. The core component of an electric vehicle is a power battery pack, and the upper cover of the power battery pack 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 size of the power battery pack will be larger, and while pursuing higher energy density, the installation of the upper cover of the power battery pack also faces great challenges, such as requiring the power battery pack to be more convenient to install, avoiding affecting the battery performance, and at the same time, ensuring the structural strength.

[0003] Therefore, it is urgent to provide a power battery pack upper cover structure and a power battery, which can not only improve the convenience and efficiency of installation, but also enhance the sealing and firmness of the battery pack. CONTENT OF THE INVENTION

[0004] The application provides a power battery pack upper cover structure and a power battery, which can improve the convenience and efficiency of installation, and enhance the sealing and firmness of the battery pack.

[0005] In a first aspect, the application provides a power battery pack upper cover structure for cooperating with a battery lower box body to form a seal, the upper cover structure comprising: a top cover plate, the top cover plate having a first central axis in a first direction, the top cover plate being symmetrical about the first central axis; side cover plates fixedly connected on both sides of the top cover plate respectively, the two side cover plates being symmetrical about the first central axis; a flat top structure, the flat top structure being located at both ends of the top cover plate and on the first central axis, the flat top structure being composed of a first plane and two transition surfaces respectively connected on both sides of the first plane, wherein the first plane is flush with the top cover plate, and the two transition surfaces are symmetrical about the first central axis.

[0006] By the above scheme, the top cover plate has a first central axis in the first direction and is symmetrical about the central axis. This means that the top cover plate is a central symmetrical design, which helps to maintain the balance and uniform distribution of the structure; the side cover plates are respectively fixedly connected on both sides of the top cover plate, and the two side cover plates are symmetrical about the first central axis. This design helps to form a sealed space while maintaining the symmetry and aesthetics of the overall structure, and also ensures the balance and uniform distribution of the overall structure of the upper cover structure, so that when installed on the battery lower box, it does not destroy the balance of the battery pack as a whole, ensuring the installation performance. At the same time, the symmetrical design of the top cover plate and the side cover plate allows the upper cover structure to be split from both sides along the first central axis as a bisector during installation. This design simplifies the installation process, allowing the two side cover plates to be opened outward, which facilitates the vertical closing of the upper cover structure on the battery lower box and avoids friction with the sealing ring on the battery lower box, thereby preventing the sealing ring from shifting and ensuring the sealing performance during installation. When the upper cover structure is installed, the design of the first plane flush with the top cover plate ensures that the upper cover structure is not hindered when it is split, making the operation smoother and reducing the difficulties that may be encountered during installation. Furthermore, the design of the first plane and the transition surfaces on both sides forms a flat top structure, which can be installed in cooperation with the corresponding protrusions on the lower box, facilitating the positioning of the upper cover structure and the battery lower box during installation, and more conducive to the sealing connection between the two, improving the overall firmness and sealing performance of the battery pack. Therefore, the above upper cover structure not only improves the convenience and efficiency of installation, but also significantly enhances the sealing performance and firmness of the battery pack.

[0007] In a possible design, the first plane extends beyond the end edge of the top cover plate by a dimension not less than the thickness of the corresponding position of the battery lower box.

[0008] By the above scheme, the extension of the first plane relative to the end edge of the top cover plate allows the upper cover structure to better cover and fix the corresponding position of the lower box when cooperating with the lower box, improving the tightness between the two. The extension dimension is not less than the thickness of the corresponding position of the lower box, which means that the first plane can completely cover the edge of the lower box, thereby ensuring that the sealing ring or sealing structure can completely seal the opening of the battery pack to prevent the intrusion of liquid and dust. This design also improves the compatibility of the upper cover structure with battery lower boxes of different thicknesses, as the upper cover structure can adapt to the thickness of the lower box within a certain range, which helps to reduce inventory and manufacturing costs.

[0009] In a possible design, the width of the first plane is not less than the thickness of the top cover plate, and the width of the first plane is the dimension of the first plane in the direction perpendicular to the first central axis.

[0010] Through the above scheme, the width of the first plane is not less than the thickness of the top cover plate, which prevents the upper cover structure from being hindered when being pried open, making the operation more smooth and reducing the difficulties that may be encountered during installation.

[0011] In a possible design, the installation side plate is further included, and the two transition surfaces are connected with the installation side plate, and the installation side plate extends around the periphery of the upper cover structure and is connected with the transition surface of the flat top structure at the other end opposite to the top cover plate.

[0012] Through the above scheme, the installation side plate extends around the periphery of the upper cover structure and is connected with the transition surface of the flat top structure at the other end opposite to the top cover plate, and such a design enhances the stability and integrity of the entire upper cover structure. The existence of the installation side plate makes the upper cover structure easier to align and fix on the lower box body during installation, improving the convenience of installation and the accuracy of positioning.

[0013] In a possible design, the support flap is further included, and the support flap is located at both ends of the top cover plate and the side cover plate, and the support flap has a first connecting edge connected with the top cover plate, a second connecting edge connected with the side cover plate, and a third connecting edge connected with the transition surface; and the installation side plate is fixed on the outer edge of the support flap and the outer edge of the side cover plate.

[0014] Through the above scheme, the support flap is located at both ends of the top cover plate and the side cover plate, and the support flap forms a stable structure system through the connection with the top cover plate, the side cover plate and the transition surface, which improves the stability and rigidity of the entire upper cover structure, similar to the principle of improving the overall rigidity of the folded plate structure in the field of architecture through spatial shape action. The design of the support flap increases the firmness of the connection between the upper cover structure and the lower box body, and the design of the support flap can improve the bending stiffness of the structure, which is particularly important for the protection of the battery pack when subjected to lateral force. The vehicle collision force transmission path is closely related to the arrangement form of the battery pack on the vehicle body. The design of the support flap helps to optimize the vehicle collision force transmission path and improve the protection effect of the battery pack.

[0015] In a possible design, the support flap includes a support main body part and a connecting part, the support main body part is connected at the corresponding corner of the top cover plate and the side cover plate, and the connecting part includes a first connecting part and a second connecting part, wherein the first connecting part is connected only at the end edge of the top cover plate, and the second connecting part is connected only at the end edge of the side cover plate.

[0016] By the above scheme, the support main body part is arranged at the corner corresponding to the top cover plate and the side cover plate, which helps to enhance the stability and rigidity of the whole upper cover structure. Through the space shape effect, similar to the principle of improving the overall rigidity of the folded plate structure in the field of architecture, the design of the support folded plate can greatly improve the overall rigidity of the structure. The cooperation design of the support main body and the connecting part makes the overall shape and structure size of the support folded plate more flexible, and the size of the support main body area can be designed according to the specific size of the battery pack, so as to better improve the overall rigidity of the structure.

[0017] In a possible design, the support main body part has a fourth connecting edge connected with the battery lower box, and the fourth connecting edge is designed as a straight line, so that the support main body part is in a triangular shape.

[0018] By the above scheme, the support main body part is arranged at the corner corresponding to the top cover plate and the side cover plate, which helps to enhance the stability and rigidity of the whole upper cover structure. Through the space shape effect, similar to the principle of improving the overall rigidity of the folded plate structure in the field of architecture, the design of the support folded plate can greatly improve the overall rigidity of the structure. The cooperation design of the support main body and the connecting part makes the overall shape and structure size of the support folded plate more flexible, and the size of the support main body area can be designed according to the specific size of the battery pack, so as to better improve the overall rigidity of the structure.

[0019] In a possible design, the mounting edge plate corresponding to the support main body part and the first connecting part is parallel to the top cover plate, and the mounting edge plate corresponding to the second connecting part is parallel to the side cover plate.

[0020] By the above scheme, the parallel design of the mounting edge plate and the top cover plate and the side cover plate ensures the consistency and coordination of the whole upper cover structure. This design helps to maintain the symmetry and aesthetics of the structure, and also simplifies the manufacturing and assembly process. Among them, the connecting plate corresponding to the position around the support main body part and the first connecting part is parallel to the top cover plate, so that when assembled with the battery lower box, riveting or screwing can be performed in the vertical direction, thereby ensuring the installation strength; the connecting plate corresponding to the position around the second connecting part is parallel to the side cover plate, so that after assembly with the battery lower box, riveting or screwing can be performed in the direction perpendicular to the side cover plate to the inside of the battery pack, which makes the side of the whole battery pack not occupy extra volume due to installation, thereby improving the energy density of the whole battery pack.

[0021] In a possible design, a sealing ring is further included, which is sleeved around the battery lower box in correspondence with the shape of the mounting edge plate.

[0022] Through the above scheme, the sealing ring corresponds to the shape of the mounting side plate, and the design ensures that the sealing ring can tightly fit the periphery of the battery lower box, thereby providing effective sealing effect. In cooperation with the upper cover structure, the first median axis can be used as a bisector to be pried open from both sides, so that the two side cover plates can be properly opened outward to cover the battery lower box. The mounting mode avoids friction between the sealing ring and the upper cover structure during installation, thereby preventing deviation and effectively ensuring the sealing performance during installation.

[0023] In a second aspect, the application provides a power battery, comprising a battery lower box and the upper cover structure of any one of the power battery packs.

[0024] The power battery provided in the above second aspect and each possible design of the above second aspect has the beneficial effects of the first aspect and each possible embodiment 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 application. In order to more clearly understand the technical means of the embodiments of the application, the embodiments of the application can 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 application more obvious and easy to understand, the specific embodiments of the application are described below. BRIEF DESCRIPTION OF DRAWINGS

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

[0027] Figure 1 The upper cover structure of the power battery pack provided by an embodiment of the application is shown in the schematic view.

[0028] Figure 2 The enlarged schematic view of the flat top structure in Figure 1

[0029] Figure 3 Another view of the upper cover structure of the power battery pack provided by an embodiment of the application.

[0030] Figure 4 The schematic view of the upper cover structure of the power battery pack provided by an embodiment of the application in the process of installation.

[0031] Figure 5 The schematic view of the power battery pack provided by an embodiment of the application.

[0032] ​Figure 6 Another perspective view of the power battery pack is provided for an embodiment of the present application.

[0033] Legend of reference signs:

[0034] 100, top cover plate; 200, side cover plate; 210, support flap; 211, support main body; 212, first connecting part; 213, second connecting part; 221, fourth connecting edge; 300, flat top structure; 310, first plane; 320, transition surface; 400, mounting edge plate; 401, mounting hole; 500, sealing ring; 10, battery lower box body; 20, coaming; 21, protrusion; X, first direction; Y, second direction; Z, third direction; L, first central axis. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection 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 specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "including" as used herein is meant to be equivalent to the term "comprising" and is used in the same way.

[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 "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. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0038] The term "and / or", merely used as a description of associated objects, means that there can be three relationships, for example, A and / or B, which means that there are 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 upper cover structure of the application. For example, in the description of the application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like 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 application and simplifying the description, and do not 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 application.

[0040] In addition, the terms "first", "second", and the like in the description and claims of the 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 application, unless otherwise specified, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

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

[0043] Energy density is the main performance parameter of power battery, which refers to the energy that the battery can store in unit mass or unit volume, and directly affects the endurance mileage of the vehicle. With the increasing demand for endurance mileage of commercial heavy truck, power battery pack needs to meet higher energy demand, therefore, the size of power battery pack will be larger, while pursuing higher energy density, the installation of the upper cover of power battery pack also faces great challenges.

[0044] Therefore, the application provides a top cover structure of a power battery pack and a power battery. The top cover plate is designed to be split from both sides along the first central axis as a bisector, so that the two side cover plates can be properly opened outward. This facilitates the vertical combination of the top cover structure on the lower battery box, avoids friction with the sealing ring on the lower battery box, and prevents the sealing ring from being offset. Therefore, the sealing property during installation is well guaranteed. Meanwhile, the design of the first plane flush with the top cover plate ensures that the top cover structure is not hindered when being split, and the design of the first plane and the two transition surfaces forming a flat top structure can be matched with the corresponding protrusion design on the lower box for installation, which is beneficial to the positioning of the top cover structure and the lower battery box during installation, can improve the convenience and efficiency of installation, and can also enhance the sealing property and firmness of the battery pack.

[0045] In order to enable personnel in the technical field to better understand the application scheme, the technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings.

[0046] Figure 1 The top cover structure of the power battery pack provided in the embodiment is shown in the figure. Figure 2 For Figure 1 The enlarged schematic view of the flat top structure in the figure. Please refer to Figure 1 and Figure 2 The top cover structure of the power battery pack in the embodiment is used to form a seal with the lower battery box 10, and the top cover structure comprises a top cover plate 100, side cover plates, and a flat top structure 300.

[0047] The top cover plate 100 has a first central axis L in the first direction, and the top cover plate 100 is symmetrical about the first central axis L. The side cover plates are fixedly connected on both sides of the top cover plate 100, and the two side cover plates are symmetrical about the first central axis L.

[0048] The flat top structure 300 is located at both ends of the top cover plate 100 and on the first central axis L, and the flat top structure 300 is composed of a first plane 310 and transition surfaces 320 connected on both sides of the first plane 310. The first plane 310 is flush with the top cover plate 100, and the two transition surfaces 320 are symmetrical about the first central axis L.

[0049] It can be understood that the first plane 310 and the top cover plate 100 flush includes the upper surface of the first plane 310 and the upper surface of the top cover plate 100 flush, the lower surface of the first plane 310 and the lower surface of the top cover plate 100 flush. Through the above scheme, the top cover plate 100 has a first central axis L along the first direction, and is symmetrical about the central axis. This means that the top cover plate 100 is a central symmetric design, which helps to maintain the balance and uniform distribution of the structure. The side cover plates are fixedly connected on both sides of the top cover plate 100 respectively, and the two side cover plates are symmetrical about the first central axis L. This design helps to form a sealed space while maintaining the symmetry and beauty of the overall structure, and can also guarantee the balance and uniform distribution of the load of the overall structure of the upper cover structure, so that when installed on the battery lower box 10, the balance of the overall battery pack is not destroyed, and the installation performance is guaranteed.

[0050] Figure 3 Another perspective view of the upper cover structure of the power battery pack provided by the embodiment. Figure 4 A state diagram of the upper cover structure of the power battery pack provided by the embodiment during installation. Figure 5 An explosion diagram of the power battery pack provided by the embodiment. Figure 6 Another perspective view of the power battery pack provided by the embodiment, please refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , wherein the length direction of the upper cover structure is the first direction X, the width direction of the upper cover structure is the second direction Y, and the connecting direction of the side cover plate is the third direction Z. The symmetrical design of the top cover plate 100 and the side cover plate allows the upper cover structure to be opened from both sides along the first central axis L as a bisector during installation, which simplifies the installation process and allows the two side cover plates to be opened outward appropriately, such as Figure 4In the middle, two side plates are opened in the direction away from each other, so that the bottom opening of the upper cover structure increases, and can be buckled on the lower box body of the battery. The direction perpendicular to the lower box body 10 of the battery is the third direction Z, and the upper cover structure is pried open from the second direction Y, so that the upper cover structure can be prevented from rubbing with the sealing ring 500 connected to the upper box body 10 of the battery when being closed in the third direction Z, so as to avoid the phenomenon of the sealing ring 500 being offset, and the sealing performance during installation can be well guaranteed. When the upper cover structure is installed, the design that the first plane 310 is flush with the top cover plate 100 ensures that the upper cover structure will not be hindered when being pried open, which makes the operation more smooth and reduces the difficulties that may be encountered during installation. And the design that the first plane 310 and the two side transition surfaces 320 form a flat top structure 300 can be designed and installed in cooperation with the corresponding protrusions 21 on the lower box body, which is beneficial to the positioning of the upper cover structure and the lower box body 10 of the battery during installation, and is more beneficial to the sealing butt joint between the two, improves the firmness and sealing performance of the whole battery pack. Therefore, the above-mentioned upper cover structure not only improves the convenience and efficiency of installation, but also significantly enhances the sealing performance and firmness of the battery pack.

[0051] In the embodiment, the first plane 310 protrudes relative to the end edge of the top cover plate 100 by a size not less than the thickness dimension of the corresponding position of the lower box body 10 of the battery.

[0052] Reference can be made in combination with Figure 5 and Figure 6 The lower box body 10 of the battery is the load-bearing member of the whole battery system, which supports the battery module and protects the battery cell from physical damage. The corresponding two ends of the lower box body 10 are provided with a coaming 20, which can be used to install various electrical components. When the upper cover structure is closed on the lower box body 10 of the battery, the flat top structure 300 is opposite to the coaming 20, and the protruding design of the first plane 310 relative to the end edge of the top cover plate 100 makes the upper cover structure better cover and fix the corresponding position of the lower box body when cooperating with the lower box body 10 of the battery, which improves the cooperation tightness between the two. The protruding size is not less than the thickness dimension of the corresponding position of the lower box body, which means that the first plane 310 can completely cover the edge of the lower box body, so as to ensure that the sealing ring 500 or the sealing structure can completely close the opening of the battery pack and prevent the invasion of liquid and dust. This design also improves the compatibility of the upper cover structure with different thickness models of the lower box body 10 of the battery, because as long as the thickness of the lower box body is within a certain range, the upper cover structure can adapt to it, which helps to reduce inventory and manufacturing cost.

[0053] In the embodiment, the first plane 310 protrudes relative to the end edge of the top cover plate 100 by a size of 1mm-10mm.

[0054] By the above scheme, the thickness of the commonly used battery lower box 10 is generally in the range of 1-10 mm, and the first plane 310 extends 1-10 mm relative to the end edge of the top cover plate 100, which can ensure that the first plane 310 covers the edge of the lower box, providing accurate sealing effect to prevent any liquid or dust from entering the battery pack interior. Moreover, when the first plane 310 extends less than 1 mm relative to the end edge of the top cover plate 100, the sealing installation effect will be affected, and when the first plane 310 extends more than 10 mm relative to the end edge of the top cover plate 100, it can exceed the overall battery pack box size too much, resulting in a too large battery pack volume and reducing the energy density of the battery pack.

[0055] The width of the first plane is not less than the thickness of the top cover plate, and the width of the first plane is the size of the first plane in the direction perpendicular to the first central axis, which can be understood as the size of the first plane in the second direction Y. Since the width of the first plane is not less than the thickness of the top cover plate, it is not hindered when the upper cover structure is opened, which makes the operation more smooth and reduces the difficulties that can be encountered during installation.

[0056] Please refer to Figure 1 and Figure 5 In the embodiment, the upper cover structure further includes a mounting side plate 400, and the two transition surfaces 320 are connected with the mounting side plate 400. The mounting side plate 400 extends around the upper cover structure and is connected with the transition surface 320 of the flat top structure 300 at the other end opposite to the top cover plate 100.

[0057] The transition surface 320 in the embodiment can be an arc surface, and in some other embodiments, the transition surface 320 can also be provided as a flat surface.

[0058] It can be understood that the transition surface 320 can form a transition and connection between the first plane 310 and the mounting side plate 400, and there is a height difference between the first plane 310 and the mounting side plate 400, forming a step, so that the flat top structure 300 forms a recessed structure. In this way, the protrusion 21 is arranged at the corresponding position of the battery lower box 10, and when installed, the flat top structure 300 and the protrusion 21 are aligned with each other to form a positioning structure during installation, which can improve the installation efficiency.

[0059] The mounting side plate 400 in the embodiment extends around the upper cover structure and is connected with the transition surface 320 of the flat top structure 300 at the other end opposite to the top cover plate 100. This design enhances the stability and integrity of the entire upper cover structure. The presence of the mounting side plate 400 makes the upper cover structure easier to align and fix on the lower box during installation, improving the convenience of installation and the accuracy of positioning.

[0060] The mounting edge plate 400 in the embodiment is provided with mounting holes 401 at intervals, which correspond to the mounting holes provided on the lower battery box, for fixing and connecting the upper cover structure and the lower battery box 10. The fixing and connecting mode can include screwing or riveting.

[0061] Please refer to Figure 3 and Figure 4 In the embodiment, the upper cover structure is further designed with a support flap 210, which is located at both ends of the top cover plate 100 and the side cover plate. The support flap 210 has a first connecting edge connected to the top cover plate 100, a second connecting edge connected to the side cover plate, and a third connecting edge connected to the transition surface 320. The mounting edge plate 400 is fixed to the outer edge of the support flap 210 and the outer edge of the side cover plate.

[0062] The outer edge of the support flap 210 and the outer edge of the side cover plate refer to the edge of the support flap 210 or the side cover plate adjacent to the edge of the lower battery box 10.

[0063] Through the above scheme, the support flap 210 is located at both ends of the top cover plate 100 and the side cover plate. The support flap 210 forms a stable structural system through the connection with the top cover plate 100, the side cover plate and the transition surface 320. This design improves the stability and stiffness of the entire upper cover structure, similar to the principle of improving the overall stiffness of the folded plate structure in the field of architecture through spatial shape resistance. The design of the support flap 210 increases the firmness of the connection between the upper cover structure and the lower box. The design of the support flap 210 can improve the bending stiffness of the structure, which is particularly important for the protection of the battery pack when subjected to lateral force. The force transmission path of the whole vehicle collision is closely related to the arrangement form of the battery pack on the vehicle body. The support flap 210 increases the overall area of the upper cover structure and improves the protection effect of the battery pack.

[0064] Please continue to refer to Figure 3 and Figure 4 In the embodiment, the support flap 210 includes a support main body part 211 and a connecting part. The support main body part 211 is connected at the corresponding corners of the top cover plate 100 and the side cover plate. The connecting part includes a first connecting part 212 and a second connecting part 213. The first connecting part 212 is connected only to the end edge of the top cover plate 100, and the second connecting part 213 is connected only to the end edge of the side cover plate.

[0065] By the above scheme, the support main body part 211 is arranged at the corner corresponding to the top cover plate 100 and the side cover plate, which helps to enhance the stability and rigidity of the entire upper cover structure. Through the space form resistance effect, similar to the principle of improving the overall rigidity of the folded plate structure in the field of architecture, the design of the support folded plate 210 can greatly improve the overall rigidity of the structure. The cooperation design of the support main body and the connecting part makes the overall shape and structure size of the support folded plate 210 more flexible, and the size of the support main body area can be designed according to the specific size of the battery pack, so as to better improve the overall rigidity of the structure.

[0066] In the embodiment, the support main body part 211 has a fourth connecting edge 221 connected with the battery lower box body 10, and the fourth connecting edge 221 is designed as a straight line to make the support main body part 211 form a triangular shape.

[0067] In some embodiments, the fourth connecting edge 221 can be designed as a curve.

[0068] The fourth connecting edge 221 of the support main body part 211 connected with the battery lower box body 10 is designed as a straight line, so that the support main body part 211 forms a triangular shape. Such triangular structure is widely known for its inherent stability, which can effectively disperse and bear the force, improve the rigidity of the structure, and the straight line design of the fourth connecting edge 221 simplifies the connection mode with the battery lower box body 10, making the installation process more direct and efficient. The straight connecting edge reduces the complex geometric shape, making the manufacturing and installation more convenient.

[0069] Please refer to Figure 1 and Figure 5 In the embodiment, the mounting edge plate 400 corresponding to the connection of the support main body part 211 and the first connecting part 212 is parallel to the top cover plate 100. The mounting edge plate 400 corresponding to the connection of the second connecting part 213 is parallel to the side cover plate.

[0070] The parallel design of the mounting edge plate 400 and the top cover plate 100 and the side cover plate ensures the consistency and coordination of the entire upper cover structure, which helps to maintain the symmetry and aesthetics of the structure, and also simplifies the manufacturing and assembly process. Among them, the connecting plate corresponding to the position around the support main body part 211 and the first connecting part 212 is parallel to the top cover plate 100, so that when assembling with the battery lower box body 10, rivets or bolts can be riveted or screwed from the third direction Z to fix the connection between the upper cover structure and the battery lower box body 10, ensuring the installation strength of the upper cover structure.

[0071] Corresponding to the connecting plate and the side cover plate around the position of the second connecting part 213 are parallel, so that after assembling with the battery lower box 10, rivets or bolts can be riveted or screwed from the second direction Y to fix the connection of the upper cover structure and the battery lower box 10. The connection from the second direction Y makes the side of the whole battery pack not occupy extra volume due to installation, and improves the energy density of the whole battery pack.

[0072] In the embodiment, the upper cover structure can further include a sealing ring 500 corresponding to the shape of the mounting plate 400, which is sleeved around the battery lower box 10. The sealing ring 500 corresponds to the shape of the mounting plate 400, which ensures that the sealing ring 500 can tightly fit around the battery lower box 10, thereby providing effective sealing effect. In cooperation with the upper cover structure, the first median axis L can be used as a bisector to separate the two side cover plates from both sides, so that the two side cover plates can be properly opened outward to cover the battery lower box 10. The installation mode avoids the friction between the sealing ring 500 and the upper cover structure during installation, thereby avoiding the offset of the sealing ring 500 and the upper cover structure during installation, and well guarantees the sealing performance during installation.

[0073] Based on the above-mentioned upper cover structure of the power battery pack, the embodiment further provides a power battery including a battery lower box 10 and the upper cover structure of any of the power battery packs described above, and the upper cover structure of the power battery pack cooperates with the battery lower box 10 to form a seal.

[0074] Since the upper cover structure of the power battery pack and its beneficial effects have been described in detail in the foregoing embodiments, the present application will not be repeated here.

[0075] The above embodiments are only used to illustrate the technical solutions of the present application, and 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 they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; 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. An upper cover structure of a power battery pack, used for cooperating with a battery lower box body to form a seal, characterized in that, include: a top cover plate, the top cover plate having a first central axis along a first direction, and the top cover plate being symmetrical about the first central axis; Side cover plates are respectively fixedly connected to both sides of the top cover plate, and the two side cover plates are symmetrical about the first central axis; A flat-top structure is located at both ends of the top cover plate and on the first central axis. The flat-top structure is composed of a first plane and transition surfaces respectively connected to both sides of the first plane, wherein the first plane is flush with the top cover plate, and the two transition surfaces are symmetrical about the first central axis.

2. The upper cover structure of the power battery pack according to claim 1, characterized in that, The first plane extends out relative to the end edge of the top cover plate, and the extension dimension is not less than the box body thickness dimension at the corresponding position of the battery lower box body.

3. The upper cover structure of the power battery pack according to claim 2, characterized in that, The width of the first plane is not less than the thickness of the top cover plate, and the width of the first plane is the dimension of the first plane in a direction perpendicular to the first central axis.

4. The upper cover structure of the power battery pack according to claim 1, characterized in that, It also includes a mounting side plate, the two transition surfaces are connected with the mounting side plate, the mounting side plate extends around a periphery of the upper cover structure, and is correspondingly connected to the transition surface of the flat top structure at the other end opposite to the top cover plate.

5. The upper cover structure of the power battery pack according to claim 4, characterized in that, It also includes a supporting folded plate, the supporting folded plate is located at both ends of the top cover plate and the side cover plate, the supporting folded plate has a first connecting edge connected to the top cover plate, a second connecting edge connected to the side cover plate, and a third connecting edge connected to the transition surface; The mounting side plate is fixed to the outer edge of the supporting folding plate and the outer edge of the side cover plate.

6. The upper cover structure of the power battery pack according to claim 5, characterized in that, The supporting folding plate includes a supporting main body and a connecting part, the supporting main body is connected to the corresponding corners of the top cover plate and the side cover plate, and the connecting part includes a first connecting part and a second connecting part, wherein the first connecting part is only connected to the end edge of the top cover plate, and the second connecting part is only connected to the end edge of the side cover plate.

7. The upper cover structure of the power battery pack according to claim 6, characterized in that, The supporting body has a fourth connecting edge that is connected to the battery lower box body. The fourth connecting edge is designed as a straight line, so that the supporting body is in a triangular shape.

8. The upper cover structure of the power battery pack according to claim 7, characterized in that, The mounting side plates corresponding to the supporting main body and the first connecting portion are parallel to the top cover plate; the mounting side plates corresponding to the second connecting portion are parallel to the side cover plate.

9. The upper cover structure of the power battery pack according to claim 4, characterized in that, It also includes a sealing ring, which corresponds to the shape of the mounting side plate and is sleeved around the battery lower box.

10. A power cell, characterized by It comprises a battery lower box and the upper cover structure of the power battery pack according to any one of claims 1 to 9, wherein the upper cover structure of the power battery pack cooperates with the battery lower box to form a seal.

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