Lower case and case having same, battery pack, and electric device

Abstract

A lower case (10) and a case (100) having same, a battery pack (1000), and an electric device (10000). The lower case (10) is used for the battery pack (1000), and the lower case (10) comprises: a bottom plate (11) extending in a first direction within a horizontal plane, wherein two side edges of the bottom plate (11) in a second direction within the horizontal plane are provided with first connecting portions, the first connecting portions are used for connecting an upper case (20) of the battery pack (1000), and the first direction intersects with the second direction; and first side plates (12), wherein there are two first side plates (12) respectively arranged at two ends of the bottom plate (11) in the first direction, the first side plates (12) are vertically arranged, and the lower ends of the first side plates (12) are fully welded to the bottom plate (11).

Description

Lower box, box, battery pack and electrical device having the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202323285303.6 and application date November 30, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a lower box and a box, a battery pack and an electrical device having the same. Background Art

[0004] To meet the installation requirements of different vehicle types, battery packs often require housing structures of varying sizes and shapes. For vehicles with limited installation space, the battery pack housing structure must be compact while maintaining a high energy density. In related art, to ensure sufficient structural strength, the lower housing structure is often complex. This makes the lower housing difficult to manufacture using an integrated molding process, resulting in high production costs and inconvenience.

[0005] Application Contents

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application is to propose a lower box body that can be easily processed and formed, making the production of the lower box body more convenient.

[0007] The present application also proposes a box body having the above-mentioned lower box body.

[0008] The present application also proposes a battery pack having the above-mentioned box.

[0009] The present application also provides an electrical device having the above-mentioned battery pack.

[0010] According to the lower box body of the first aspect of the present application, the lower box body is used for a battery pack, and the lower box body includes: a bottom plate, the bottom plate extends along a first direction in a horizontal plane, and the two side edges of the bottom plate in a second direction in the horizontal plane are provided with first connecting parts, and the first connecting parts are used to connect to the upper box body of the battery pack, and the first direction intersects with the second direction; a first side plate, the number of the first side plates is two and they are respectively arranged at both ends of the bottom plate in the first direction, the first side plate is vertically arranged, and the lower end of the first side plate is fully welded to the bottom plate.

[0011] According to the lower box body of the present application, by setting two first side panels, the lower ends of the first side panels are fully welded to one end of the bottom plate in the first direction, so that the lower box body can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0012] In some embodiments of the present application, a connecting flange extending along the first direction toward the bottom plate is formed at the lower end of the first side plate, and the connecting flange is overlapped and welded to the bottom plate.

[0013] In this embodiment, a connecting flange is formed at the lower end of the first side panel, which overlaps and is welded to the bottom panel, so that the first side panel can be connected and fixed to the bottom panel more conveniently and reliably. The overlap of the first side panel and the bottom panel can enable the bottom panel to better support and fix the first side panel, making the connection and fixation of the first side panel and the bottom panel more stable and reliable. The connecting flange forms an angle with the vertically extending structure of the first side panel, which can make the lower end of the first side panel have better structural strength, thereby greatly improving the overall structural strength of the first side panel and making the connection and fixation of the first side panel and the bottom panel more stable and reliable.

[0014] In one embodiment of the present application, the base plate is provided with supporting plate portions at both ends in the first direction, and the connecting flanges are supported on the upper side surfaces of the supporting plate portions and connected to the supporting plate portions.

[0015] In this embodiment, a supporting plate portion is provided on the bottom plate and is connected to the connecting flange, which can make the connection and fixation between the first side plate and the bottom plate more stable and reliable, thereby making the molding of the lower box body more convenient and easy.

[0016] In some embodiments of the present application, a positioning structure is provided on at least one of the base plate and the first side plate, and the positioning structure is used to position the first side plate on the base plate. The positioning structure is formed as a positioning hole, a positioning column and / or a positioning surface.

[0017] This embodiment provides a positioning structure on at least one of the bottom plate and the first side plate, so that the first side plate and the bottom plate can be positioned and assembled more conveniently and quickly, thereby making the assembly of the bottom plate and the first side plate more convenient and improving the production efficiency of the lower box body.

[0018] In some embodiments of the present application, the base plate has first connecting edges extending vertically on both sides in the second direction, the first connecting portion is formed on the first connecting edge, the first connecting portion is formed as a first connecting hole and passes through the first connecting edge along the second direction, the number of the first connecting holes is multiple, and the multiple first connecting holes are arranged at intervals along the first direction, and the first connecting edge is connected to the upper box body by fasteners passing through the first connecting holes.

[0019] In this embodiment, the first connecting edge is set to extend vertically and a first connecting hole is set on the first connecting edge, and the upper box body and the lower box body are connected and fixed by fasteners passing through the first connecting hole along the second direction. After the lower box body and the upper box body are assembled, the overall structure is more compact and the layout space can be better utilized, so that the battery pack can be installed and arranged more conveniently in scenarios where the installation space is small, and the battery pack can have a higher energy density.

[0020] In one embodiment of the present application, a first connecting nut is embedded in the first connecting hole.

[0021] In this embodiment, a first connecting nut is embedded in the position of the first connecting hole, so that when the lower box body and the upper box body are assembled and fixed, a fastener can be extended from the outside into the first connecting hole and cooperate with the first connecting nut to screw the lower box body and the upper box body together, making the connection and fixation of the lower box body and the upper box body more convenient and easy.

[0022] In one embodiment of the present application, the first connecting edge is formed by bending both side edges of the bottom plate in the second direction upward.

[0023] In this embodiment, the first connecting edge is formed by bending, which has a simple structure and is easy to process, making the processing and manufacturing of the base plate relatively convenient and easy. Bending the base plate to form the first connecting edge can greatly strengthen the structural strength of the base plate on both sides in the second direction, thereby greatly improving the overall structural strength of the base plate. To a certain extent, the base plate can be reduced in weight while maintaining good structural strength, thereby meeting the need for lightweighting and improving the weight energy density of the battery pack.

[0024] In some embodiments of the present application, the lower box further includes: a reinforcement structure, which is connected to the bottom plate and arranged on the lower side of the bottom plate.

[0025] In this embodiment, a reinforcement structure is provided on the bottom plate, so that the overall structural strength of the bottom plate can meet the support and fixation requirements in the battery pack. When the bottom plate is designed and manufactured, the bottom plate structure can be flexibly and conveniently adjusted and optimized in conjunction with the arrangement of the reinforcement structure, thereby reducing the structural strength requirements of the bottom plate to a certain extent, making the bottom plate structure simpler and using less material, thereby reducing the difficulty of processing and manufacturing the bottom plate and the overall structural weight of the bottom plate and the reinforcement structure, making the production and manufacturing of the lower box easier and more convenient.

[0026] In one embodiment of the present application, the reinforcement structure is connected to the base plate by welding.

[0027] This invention realizes the connection between the reinforcement structure and the base plate by welding, which is convenient and reliable, and makes the connection between the reinforcement structure and the base plate stable and firm.

[0028] In one embodiment of the present application, the reinforcement structure is a frame structure and includes: a first reinforcement member, the number of the first reinforcement members is two, the two first reinforcement members extend along the first direction and are arranged at intervals in the second direction; a second reinforcement member, the second reinforcement member extends along the second direction and the two ends are respectively connected to the two first reinforcement members.

[0029] This embodiment employs a frame-like reinforcement structure, which is lightweight, possesses excellent structural strength, and utilizes minimal materials. This reduces the overall weight of the lower case, thereby improving the weight-energy density of the battery pack to a certain extent. This embodiment includes a first reinforcement member extending in a first direction and a second reinforcement member extending in a second direction. The first and second reinforcement members cooperate to provide excellent structural reinforcement for the base plate in both the first and second directions, ensuring a more stable and reliable support and fixation of the base plate after being connected to the reinforcement structure.

[0030] In some examples of the present application, there are multiple second reinforcement members, and the multiple second reinforcement members are arranged at intervals along the first direction.

[0031] In this embodiment, multiple second reinforcement members are provided and arranged along the first direction, so that the second reinforcement members can more comprehensively cover the extension range of the base plate in the first direction, so that the base plate can obtain stable and reliable structural reinforcement, and the distribution of the reinforcement structure and the overall structure of the base plate is more uniform and reasonable.

[0032] In some examples of the present application, the first reinforcement includes: a first plate portion and a second plate portion, the first plate portion is vertically arranged, the second plate portion is connected to the lower end of the first plate portion and extends along the second direction toward the second reinforcement until it is connected to the second reinforcement, and the bottom plate is arranged between the two first plate portions of the two first reinforcements.

[0033] In this embodiment, the first reinforcement includes a first plate portion arranged vertically and a first plate portion extending along the second direction. The first plate portion and the second plate portion reinforce the bottom and edges of the bottom plate on both sides of the second direction, and the structure at the first connecting hole of the bottom plate can be well reinforced, so that the connection and fixation of the bottom plate with the upper box body is more stable and reliable when assembled and fixed.

[0034] In one example of the present application, a first folded edge extending upward is formed at one end of the second plate portion facing away from the first plate portion, a groove is defined between the first folded edge and the first plate portion, and first connecting edges extending vertically are formed on both sides of the bottom plate in the second direction, the first connecting edge is arranged in the groove, and the first connecting portion is formed on the first connecting edge.

[0035] In this embodiment, the second plate portion is formed with a first folded edge which cooperates with the first plate portion to define a groove, so that when the base plate is connected and fixed to the reinforcing structure, the first connecting edge can be positioned and fitted in the groove more quickly and conveniently, thereby facilitating the assembly connection between the base plate and the reinforcing structure.

[0036] In some specific embodiments of the present application, a plurality of avoidance holes are formed on the first plate portion and pass through the first plate portion along the second direction. The plurality of avoidance holes correspond one-to-one to the plurality of first connecting portions. The avoidance holes are directly opposite to the corresponding first connecting portions in the second direction so that the first connecting portions are exposed.

[0037] In this embodiment, a plurality of avoidance holes corresponding to the first connecting parts are provided on the first plate part, so as to facilitate the cooperation between the first connecting part on the bottom plate and the fastener.

[0038] In some specific embodiments of the present application, a second folded edge is formed at the upper end of the first folded edge and extends away from the first plate portion along the second direction, and the second folded edge is overlapped with the upper side surface of the second reinforcement.

[0039] In this embodiment, by forming a second folded edge extending along the second direction at the upper end of the first folded edge, the structural strength of the second plate portion can be improved, so that the first reinforcement can play a better structural reinforcement role on the bottom plate. To a certain extent, the first reinforcement can use less material during design and manufacturing, thereby better meeting the needs of lightweighting the lower box. The provision of the second folded edge can enable the first reinforcement and the second reinforcement to have a good matching overlap surface when connected and fixed, making the connection and fixation of the first reinforcement and the second reinforcement more convenient and stable.

[0040] In some examples of the present application, both the first reinforcement and the second reinforcement are sheet metal parts.

[0041] In this embodiment, the first reinforcement and the second reinforcement are both set as sheet metal parts, so that the first reinforcement and the second reinforcement are easy to form, easy to process, and have low manufacturing costs. The first reinforcement and the second reinforcement after processing are light in weight and high in structural strength, thereby playing a good structural reinforcement role for the bottom plate and meeting the need for lightweighting the lower box, thereby greatly improving the weight energy density of the battery pack.

[0042] In some embodiments of the present application, a connecting flange is formed at the lower end of the first side panel extending along the first direction toward the bottom plate, and the connecting flange is welded to the bottom plate. A second connecting edge is formed around the first side panel extending along the first direction, and the second connecting edge extends along the circumference of the first side panel and its two ends are respectively connected to the two ends of the connecting flange in the second direction. A plurality of second connecting holes are formed on the second connecting edge, and the plurality of second connecting holes are arranged at intervals along the circumference of the first side panel. The second connecting edge is connected to the upper box body by fasteners passing through the second connecting holes.

[0043] In this embodiment, a second connecting edge extending along the first direction toward the bottom plate is formed on the circumference of the first side plate, which can make the connection and fixation between the lower box body and the upper box body more convenient and stable, and the box structure formed by the lower box body and the upper box body has a larger accommodating cavity space, thereby improving the energy density of the battery pack to a certain extent.

[0044] In one embodiment of the present application, a second connecting nut is embedded in the second connecting hole.

[0045] In this embodiment, a second connecting nut is embedded in the position of the second connecting hole, so that when the lower box body and the upper box body are assembled and fixed, the fastener can be extended from the outside into the second connecting hole and cooperate with the second connecting nut to screw the lower box body and the upper box body, making the connection and fixation of the lower box body and the upper box body more convenient and easy.

[0046] The box body according to the second aspect of the present application includes a lower box body according to the first aspect of the present application; an upper box body, the upper box body includes a top plate and a second side plate, there are two second side plates, the two second side plates are respectively connected to the two ends of the top plate in the first direction and extend downward, the top plate and the two second side plates cooperate to form the upper box body with openings at both ends in the first direction, wherein the lower end of the second side plate is connected to the first connecting part, and the two first side plates respectively cover the two side openings of the upper box body in the first direction.

[0047] According to the box body of the present application, by setting the lower box body of the above-mentioned first aspect, the lower box body is provided with two first side panels, the lower end of the first side panel is fully welded to one end of the bottom plate in the first direction, and the two side edges of the bottom plate in the second direction form a first connection part fixed to the upper box body, so that the lower box body can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0048] The battery pack according to the third aspect of the present application includes the box according to the second aspect of the present application.

[0049] According to the battery pack of the present application, by setting the box body of the second aspect mentioned above, the box body is provided with two first side panels, the lower end of the first side panel is fully welded to one end of the bottom plate in the first direction, and the two side edges of the bottom plate in the second direction form a first connection part fixed to the upper box body, so that the lower box body can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0050] The electrical device according to the fourth aspect of the present application includes the battery pack according to the third aspect of the present application.

[0051] According to the electrical device of the present application, by setting the battery pack of the third aspect mentioned above, two first side panels are provided in the battery pack, the lower end of the first side panel is fully welded to one end of the bottom plate in the first direction, and the two side edges of the bottom plate in the second direction form a first connection portion fixed to the upper box body, so that the lower box body can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0052] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIG1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0054] FIG2 is a schematic diagram of a battery pack according to an embodiment of the present application;

[0055] FIG3 is a schematic diagram of a lower box according to an embodiment of the present application;

[0056] FIG4 is a partial schematic diagram of the lower box at another angle according to an embodiment of the present application;

[0057] FIG5 is an exploded schematic diagram of a lower box according to an embodiment of the present application;

[0058] FIG. 6 is a schematic enlarged view of a portion of point A shown in FIG. 5 .

[0059] Figure numerals: 10, lower box body; 101, avoidance hole; 11, bottom plate; 111, support plate part; 112, first connecting edge; 113, first connecting nut; 12, first side plate; 121, connecting flange; 122, second connecting edge; 123, second connecting nut; 13, reinforcement structure; 131, first reinforcement; 1311, first plate part; 1312, second plate part; 1313, first folding edge; 1314, second folding edge; 132, second reinforcement; 14, water-cooling structure; 20, upper box body; 21, top plate; 22, second side plate; 30, seal; 100, box body; 1000, battery pack; 2000, controller; 3000, motor; 10000, electrical device. DETAILED DESCRIPTION

[0060] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0062] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0063] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0065] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0066] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0067] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0068] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0069] The case of a battery pack generally consists of an upper case and a lower case. The lower case generally has four side panels and a bottom plate. The four side panels are formed around the sides of the bottom plate and are integrally formed with the bottom plate. However, for battery packs used in narrow installation spaces, in order to maintain good energy density of the battery pack and meet lightweight requirements, the bottom plate of the lower case often needs to be designed to be more complex. This makes it more difficult to manufacture the battery pack as a whole, increases production costs, and makes it difficult to form the lower case.

[0070] Based on the above considerations, in order to facilitate the processing and forming of the lower box body and reduce the production cost of the lower box body, the present application designs a lower box body, which includes a bottom plate and two side plates. The two side plates and the bottom plate are welded to form a lower box body structure, which reduces the difficulty of forming the lower box body, makes the processing and manufacturing of the lower box body easier, and facilitates forming, thereby reducing the production cost of the lower box body.

[0071] The battery pack housing is used to house the battery pack's multiple battery cells or multiple battery modules composed of multiple battery cells. The battery cells can serve as power sources for electrical devices or various energy storage systems that use batteries as energy storage elements. Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft.

[0072] For the convenience of description, the following description will take an electric device 10000 of an embodiment of the present application as a vehicle as an example.

[0073] Referring to Figure 1, Figure 1 is a schematic diagram of an electric device 10000 according to an embodiment of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack 1000 is provided inside the vehicle, and the battery pack 1000 can be provided at the bottom, head or tail of the vehicle. The battery pack 1000 can be used to power the vehicle. For example, the battery pack 1000 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery pack 1000 to power the motor 3000, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0074] In some embodiments of the present application, the battery pack 1000 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0075] The following describes the lower case 10 according to an embodiment of the first aspect of the present application with reference to Figures 2-6. Figure 2 is a schematic diagram of a battery pack 1000 according to an embodiment of the present application; Figure 3 is a schematic diagram of the lower case 10 according to an embodiment of the present application; Figure 4 is a schematic diagram of a portion of the lower case 10 from another angle according to an embodiment of the present application; Figure 5 is an exploded schematic diagram of the lower case 10 according to an embodiment of the present application; and Figure 6 is an enlarged schematic diagram of a portion A shown in Figure 5.

[0076] As shown in Figures 2 to 6, the lower box body 10 according to the embodiment of the first aspect of the present application is used for the battery pack 1000, and the lower box body 10 includes: a bottom plate 11 and a first side plate 12. The bottom plate 11 extends along a first direction in the horizontal plane (the front-to-back direction as shown in Figure 2), and the two side edges of the bottom plate 11 in the second direction in the horizontal plane (the left-to-right direction as shown in Figure 2) are provided with a first connection portion, and the first connection portion is used to connect the upper box body 20 of the battery pack 1000, and the first direction intersects with the second direction; the number of the first side plates 12 is two and they are respectively arranged at both ends of the bottom plate 11 in the first direction, and the first side plates 12 are arranged vertically (the up-down direction as shown in Figure 2), and the lower end of the first side plate 12 is fully welded to the bottom plate 11.

[0077] The base plate 11 is used to support and protect the various electrical components, electrical connectors and battery cells in the battery pack 1000. The base plate 11 can be composed of multiple layers of sheet metal. The material of the base plate 11 can be made of high-strength materials such as aluminum alloy, steel, and stainless steel. The first connecting part on the base plate 11 can be a connecting column, a connecting hole, a connecting boss, a connecting slot, and the like.

[0078] In this embodiment, the first direction intersects with the second direction, which may mean that the first direction is not parallel to the second direction. For example, the first direction and the second direction may form a certain angle, or the first direction may be perpendicular to the second direction. In this embodiment, the first connecting portion is used to connect the upper case 20 of the battery pack 1000. The first connecting portion can be connected and assembled with the upper case 20 by riveting, screwing, welding, etc. The first side panels 12 are located at both ends of the bottom plate 11 in the first direction and are arranged vertically. The lower end of the first side panel 12 is connected to the bottom plate 11. When the upper case 20 and the lower case 10 are assembled, the upper case 20 and the bottom plate 11 are connected on both sides of the edge in the second direction. The upper case 20 can cooperate with the two first side panels 12 and the bottom plate 11 to form a storage cavity structure for accommodating battery cells and other components between the bottom plate 11 and the two first side panels 12. The first side panel 12 can be made of the same material as the bottom plate 11. The first side panel 12 can be integrally formed or welded. The first side plate 12 is arranged at both ends of the bottom plate 11 along the first direction. The length dimension of the first side plate 12 in the second direction can be the same as the length dimension of the bottom plate 11 in the second direction. The vertical extension dimension of the first side plate 12 can be determined according to the design requirements of the battery pack 1000.

[0079] The lower box body 10 structure formed by the two first side panels 12 and the bottom panel 11 can be formed into a U-shape on the projection plane perpendicular to the second direction. In the second direction, both sides of the lower box body 10 are open, which can facilitate the assembly of battery cells and electrical connectors in the battery pack 1000. The lower box body 10 has a simple structure and a light weight, thereby better improving the weight energy density of the battery pack 1000.

[0080] The lower end of the first side panel 12 is fully welded to the bottom panel 11. Specifically, in the second direction, a continuous weld can be formed between the lower end of the first side panel 12 and the bottom panel 11. During the manufacturing of the lower case 10, the bottom panel 11 and the first side panel 12 can be manufactured separately. The finished bottom panel 11 and the first side panel 12 are then fully welded together to form the lower case 10 of the battery pack 1000.

[0081] In this embodiment, by providing the two first side panels 12 of the lower case 10 separately from the bottom panel 11 and connecting them by welding, the lower case 10 is easier and more convenient to manufacture, resulting in lower manufacturing costs. The lower ends of the first side panels 12 are fully welded to the bottom panel 11, ensuring that the housing cavity formed by the assembly of the lower case 10 and the upper case 20 is well sealed at the location where the lower ends of the first side panels 12 connect to the bottom panel 11. This ensures that the battery cells and electrical connectors within the battery pack 1000 are well sealed and protected within the housing cavity, ensuring more stable and reliable operation of the battery pack 1000.

[0082] In this embodiment, first connecting portions are provided along both side edges of the bottom plate 11 in the second direction to facilitate connection and assembly with the upper case 20. It will be appreciated that the multiple battery cells, electrical connectors, and other components in the battery pack 1000 are generally secured to the bottom plate 11 of the lower case 10 during assembly. The bottom plate 11 primarily supports and secures the battery pack 1000, requiring high structural strength. The first side plates 12 of the battery pack 1000 and the upper case 20 provide less support and securement. During design and manufacture, the first side plates 12 and upper case 20 can be designed with lower structural strength to reduce the weight of the battery pack 1000 and increase its gravimetric energy density. In this embodiment, the first side plates 12 and bottom plate 11 are manufactured separately. This allows for separate structural strength design during the design and manufacture of the lower case 10, allowing for greater flexibility and convenience in manufacturing the first side plates 12 and bottom plate 11, and consequently, facilitating easier and more convenient manufacturing of the lower case 10.

[0083] In this embodiment, two first side panels 12 are provided in the lower case 10 to cooperate with the upper case 20 to form a vertical panel structure circumferentially surrounding the bottom plate 11, thereby forming a storage cavity with the bottom plate 11. This simplifies the structure of the lower case 10, thereby further reducing the difficulty of processing and manufacturing the lower case 10 to a certain extent, making the production of the lower case 10 faster, more convenient, and more efficient. It is understood that during use of the battery pack 1000, the battery cells in the battery pack 1000 may expand in the thickness direction. In this embodiment, first side panels 12 are provided at both ends of the bottom plate 11 along the first direction. The first side panels 12 are welded to the bottom plate 11. After assembly of the battery pack 1000, when the thickness direction of the battery cells aligns with the first direction, the two first side panels 12 can effectively cooperate to suppress the expansion of the battery cells, thereby ensuring more stable and reliable operation of the battery pack 1000.

[0084] According to the lower box body 10 of the embodiment of the present application, by setting two first side panels 12, the lower end of the first side panel 12 is fully welded to one end of the bottom plate 11 in the first direction, so that the lower box body 10 can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0085] In some embodiments of the present application, as shown in FIG4 , a connecting flange 121 extending along a first direction toward the bottom plate 11 may be formed at the lower end of the first side plate 12 , and the connecting flange 121 is overlapped and welded to the bottom plate 11 .

[0086] The connecting flange 121 extends toward the bottom plate 11 along a first direction. Since the first side plate 12 is disposed vertically, an angle may be formed between the first side plate 12 and the connecting flange 121. The connecting flange 121 may be a horizontally extending flange structure, or may be formed as a flange structure extending upward or downward in the first direction. The connecting flange 121 overlaps the bottom plate 11. The connecting flange 121 may partially or completely overlap the bottom plate 11 in the second direction.

[0087] When the connecting flange 121 partially overlaps the bottom plate 11, the overlapping portion of the connecting flange 121 and the bottom plate 11 is vertically stacked and welded to the bottom plate 11. The remaining portion of the connecting flange 121 can abut against and be welded to the bottom plate 11 in the first direction. When the connecting flange 121 and the bottom plate 11 are completely overlapped, the connecting flange 121 can be vertically stacked with the bottom plate 11 throughout the second direction. After the connecting flange 121 and the bottom plate 11 are welded, a continuous weld can be formed in the second direction. The connecting flange 121 can be partially or completely located on the upper surface of the bottom plate 11 in the first direction.

[0088] In this embodiment, a connecting flange 121 is formed at the lower end of the first side panel 12, which is overlapped and welded to the bottom panel 11, so that the first side panel 12 can be connected and fixed to the bottom panel 11 more conveniently and reliably. The first side panel 12 is overlapped with the bottom panel 11, which can make the bottom panel 11 better support and fix the first side panel 12, so that the connection and fixation of the first side panel 12 and the bottom panel 11 are more stable and reliable. The connecting flange 121 forms an angle with the vertically extending structure of the first side panel 12, which can make the lower end of the first side panel 12 have better structural strength, thereby greatly improving the overall structural strength of the first side panel 12 and making the connection and fixation of the first side panel 12 and the bottom panel 11 more stable and reliable.

[0089] In some embodiments of the present application, as shown in Figures 4 and 5, the lower end of the first side panel 12 can be formed with a connecting flange 121 extending along the first direction toward the bottom plate 11, and the connecting flange 121 is welded to the bottom plate 11. A second connecting edge 122 extending along the first direction is formed around the first side panel 12. The second connecting edge 122 extends along the circumference of the first side panel 12 and its two ends are respectively connected to the two ends of the connecting flange 121 in the second direction. A plurality of second connecting holes are formed on the second connecting edge 122, and the plurality of second connecting holes are arranged at intervals along the circumference of the first side panel 12. The second connecting edge 122 is connected to the upper box body 20 by fasteners passing through the second connecting holes.

[0090] The second connecting edge 122 can be integrally formed with the first side panel 12 and the connecting flange 121. For example, the second connecting edge 122 can be integrally formed with the first side panel 12 and the connecting flange 121 by sheet metal stamping. The length dimension of the second connecting edge 122 in the first direction can be greater than, less than or equal to the length dimension of the connecting flange 121 in the first direction. The length dimension of the second connecting edge 122 in the first direction can be set as needed.

[0091] When the lower case 10 is connected and fixed to the upper case 20, the upper case 20 is connected and fixed to the second connecting edge 122 in the circumferential direction of the first side panel 12 via fasteners. Specifically, the upper case 20 and the portion of the second connecting edge 122 extending vertically in the second direction are overlapped and connected, and the upper case 20 and the portion of the second connecting edge 122 extending in the second direction are overlapped and connected vertically. There are multiple second connecting holes, for example, there can be three, four, five, six, seven, eight, etc. The second connecting holes can be evenly spaced or unequally spaced along the circumference of the first side on the second connecting edge 122. The location of the second connecting holes can be reasonably set according to the connection and fixation requirements of the lower case 10 and the upper case 20.

[0092] In this embodiment, a second connecting edge 122 is formed on the first side panel 12 to connect to the upper case 20. This simple structure increases the structural strength of the first side panel 12, allowing it to be more stably connected and fixed to the upper case 20. This also helps prevent expansion of the battery cells in the battery pack 1000, improving the stability of the battery pack 1000. The first side panel 12 adopts a flanged structure, which ensures that the first side panel 12 is lightweight while maintaining good structural strength. This reduces the weight of the lower case 10, thereby improving the weight energy density of the battery pack 1000.

[0093] A connecting flange 121 and a second connecting edge 122 are formed in the circumferential direction of the first side plate 12, so that the connecting flange 121 and the second connecting edge 122 can enclose a cavity on the side of the first side plate 12 facing the bottom plate 11. After the lower box body 10 and the upper box body 20 are connected and fixed, the cavity enclosed by the connecting flange 121 and the second connecting edge 122 forms a part of the accommodating cavity in the box body 100. The battery cells, electrical connectors and other components in the accommodating cavity can be installed and arranged using the cavity, so that the battery pack 1000 can have a larger accommodating cavity space with the same volume, and thus more battery cells can be arranged in the battery pack 1000, so that the energy density of the battery pack 1000 can be greatly improved.

[0094] In this embodiment, a second connecting edge 122 extending along the first direction toward the bottom plate 11 is formed on the circumference of the first side plate 12, so that the connection and fixation between the lower box body 10 and the upper box body 20 can be more convenient and stable, and the box body 100 structure formed by the lower box body 10 and the upper box body 20 has a larger accommodating cavity space, thereby improving the energy density of the battery pack 1000 to a certain extent.

[0095] In one embodiment of the present application, referring to Figures 3-6, the two ends of the base plate 11 in the first direction may be provided with support plate portions 111, and the connecting flanges 121 are supported on the upper surface of the support plate portions 111 and connected to the support plate portions 111.

[0096] The upper surface of the support plate portion 111 can be matched with the shape of the lower surface of the connecting flange 121. When the first side panel 12 is connected and fixed to the base plate 11, the connecting flange 121 of the first side panel 12 abuts against the upper surface of the support plate portion 111 and is appropriately adjusted in position. The connecting flange 121 and the support plate portion 111 are fully welded along the second direction, thereby connecting and fixing the first side panel 12 to the base plate 11.

[0097] In this embodiment, a supporting plate portion 111 is provided on the bottom plate 11 and is connected to the connecting flange 121 , which can make the connection and fixation between the first side plate 12 and the bottom plate 11 more stable and reliable, thereby making the molding of the lower box body 10 more convenient and easy.

[0098] In some embodiments of the present application, as shown in Figures 3 and 4, a positioning structure may be provided on at least one of the base plate 11 and the first side plate 12, and the positioning structure is used to position the first side plate 12 on the base plate 11. The positioning structure is formed as a positioning hole, a positioning column and / or a positioning surface.

[0099] At least one of the bottom plate 11 and the first side plate 12 is provided with a positioning structure. For example, the bottom plate 11 may be provided with a positioning structure, or the first side plate 12 may be provided with a positioning structure, or both the bottom plate 11 and the first side plate 12 may be provided with a positioning structure. The positioning structure may be one or more of a positioning hole, a positioning column, and a positioning surface. For example, when a positioning hole is provided on the bottom plate 11, a corresponding positioning column may be provided on the first side plate 12 to cooperate with the positioning hole. When a positioning surface is formed on the bottom plate 11, a corresponding matching surface may be formed on the first side plate 12. Alternatively, the bottom plate 11 may be provided with a positioning structure formed by a combination of a positioning hole and a positioning column, a positioning hole and a positioning surface, or a positioning column and a positioning surface. When the bottom plate 11 and the first side plate 12 are assembled and connected, the first side plate 12 is assembled into place with the bottom plate 11 through the positioning structure, which facilitates welding of the first side plate and the bottom plate. The specific structural form and arrangement quantity of the positioning structure can be determined as needed.

[0100] In this embodiment, a positioning structure is provided on at least one of the bottom plate 11 and the first side plate 12 so that the first side plate 12 and the bottom plate 11 can be positioned and assembled more conveniently and quickly, thereby making the assembly of the bottom plate 11 and the first side plate 12 more convenient and improving the production efficiency of the lower box body 10.

[0101] In some embodiments of the present application, as shown in Figure 3, both side edges of the bottom plate 11 in the second direction may be formed with first connecting edges 112 extending vertically, and a first connecting portion is formed on the first connecting edge 112, and the first connecting portion is formed as a first connecting hole and passes through the first connecting edge 112 along the second direction. There are multiple first connecting holes, and the multiple first connecting holes are arranged at intervals along the first direction. The first connecting edge 112 is connected to the upper box body 20 by fasteners passing through the first connecting holes.

[0102] The bottom plate 11 forms vertically extending first connecting edges 112 on both sides in the second direction. That is, the first connecting edges 112 have a certain width in the vertical direction. When the upper case 20 and the lower case 10 are assembled and fixed, as shown in Figures 2 and 4, the vertically extending side surfaces of the upper case 20 overlap and abut against the first connecting edges 112 in the second direction. Fasteners pass through the first connecting holes on the first connecting edges 112 to connect the bottom plate 11 to the upper case 20. There are multiple first connecting holes, for example, there can be three, four, five, six, seven, etc.

[0103] In this embodiment, the first connecting portion is formed on the vertically extending first connecting edge 112 and is formed as a connecting hole. The bottom plate 11 and the upper box body 20 are connected and fixed by a fastener passing through the connecting hole along the second direction. The size of the fastener and the first connecting hole has little effect on the length dimension of the bottom plate 11 in the second direction.

[0104] Specifically, since the first connecting hole is formed on the vertically extending first connecting edge 112, the aperture size of the first connecting hole will not cause an increase in the length dimension of the bottom plate 11 in the second direction during processing and manufacturing. The bottom plate 11 can omit the flange structure extending outward along the second direction, so that the lower box body 10 structure formed after the bottom plate 11 and the first side plate 12 are assembled is more compact as a whole in the second direction, and thus the box body 100 structure formed after the lower box body 10 and the upper box body 20 are assembled can better utilize the layout space. Within the same spatial range in the second direction, the lower box body 10 and the upper box body 20 can cooperate to accommodate more battery cells, thereby greatly improving the space utilization in the battery pack 1000 to a certain extent, and making the battery pack 1000 have a higher energy density.

[0105] In this embodiment, the first connecting edge 112 is set to extend vertically and a first connecting hole is provided on the first connecting edge 112, and the upper box body 20 and the lower box body 10 are connected and fixed by fasteners passing through the first connecting hole along the second direction. After the lower box body 10 and the upper box body 20 are assembled, the overall structure is more compact and the layout space can be better utilized, so that the battery pack 1000 can be installed and arranged more conveniently in scenarios where the installation space is small, and the battery pack 1000 can have a higher energy density.

[0106] In one embodiment of the present application, as shown in FIG. 4 , a first connecting nut 113 may be embedded in the first connecting hole.

[0107] The first connecting nut 113 is embedded in the first connecting hole. The first connecting nut 113 can be a rivet nut. The first connecting nut 113 is fixed to the first connecting hole by riveting. When the lower box 10 and the upper box 20 are assembled and fixed, the fastener can extend from the outside of the upper box 20 into the first connecting hole and screw together with the first connecting nut 113, thereby screwing the upper box 20 to the bottom plate 11. Optionally, the first connecting nut 113 can also be an ordinary hexagonal nut. The first connecting nut 113 can be fixed to the position of the first connecting hole by welding. The first connecting nut 113 can be set on the side surface of the first connecting edge 112 facing the bottom plate 11 along the second direction.

[0108] In this embodiment, a first connecting nut 113 is embedded in the position of the first connecting hole, so that when the lower box body 10 and the upper box body 20 are assembled and fixed, a fastener can be extended from the outside into the first connecting hole and cooperate with the first connecting nut 113 to screw the lower box body 10 and the upper box body 20, making the connection and fixation of the lower box body 10 and the upper box body 20 more convenient and easy.

[0109] In one embodiment of the present application, as shown in FIG. 5 and FIG. 6 , the first connecting edge 112 may be formed by bending both side edges of the bottom plate 11 in the second direction upward.

[0110] When manufacturing the first connecting edge 112 , the base plate 11 can be processed in a bending machine to bend both side edges of the base plate 11 in the second direction upwards. The vertical length of the first connecting edge 112 can be set according to actual assembly requirements.

[0111] In this embodiment, the first connecting edge 112 is formed by bending, which has a simple structure and is easy to manufacture, making the bottom plate 11 relatively convenient and easy to manufacture. Bending the bottom plate 11 to form the first connecting edge 112 significantly strengthens the structural strength of the bottom plate 11 on both sides in the second direction. When the lower case 10 and the upper case 20 are assembled, the lower case 10 can be more stably and securely connected to the upper case 20 via the first connecting edge 112. The overall structural strength of the bottom plate 11 is greatly improved, which allows the bottom plate 11 to reduce its weight to a certain extent while maintaining good structural strength, thereby meeting the requirements of lightweighting and improving the weight energy density of the battery pack 1000.

[0112] In some embodiments of the present application, as shown in FIG. 5 , the lower box body 10 may further include: a reinforcement structure 13 , which is connected to the bottom plate 11 and arranged on the lower side of the bottom plate 11 .

[0113] The reinforcing structure 13 can be a reinforcing plate, reinforcing ribs, reinforcing beams and other structural forms. The reinforcing structure 13 can be made of materials with higher strength. The reinforcing structure 13 can be reasonably arranged according to the support needs of various components in the battery pack 1000 at different positions of the bottom plate 11.

[0114] In this embodiment, a reinforcement structure 13 is provided on the bottom plate 11, so that the overall structural strength of the bottom plate 11 can meet the support and fixation requirements of the battery pack 1000. When the bottom plate 11 is designed and manufactured, the structure of the bottom plate 11 can be flexibly and conveniently adjusted and optimized in conjunction with the arrangement of the reinforcement structure 13, thereby reducing the structural strength requirements of the bottom plate 11 to a certain extent, making the structure of the bottom plate 11 simpler and using less material, thereby reducing the difficulty of processing and manufacturing the bottom plate 11 and the overall structural weight of the bottom plate 11 and the reinforcement structure 13, making the production and manufacturing of the lower box body 10 easier, more convenient and less costly.

[0115] In one embodiment of the present application, the reinforcement structure 13 may be connected to the base plate 11 by welding.

[0116] The reinforcement structure 13 is connected to the bottom plate 11 by welding. For example, the reinforcement structure 13 can be connected to the bottom plate 11 by spot welding, full welding, high-frequency welding, or the like.

[0117] In this embodiment, the reinforcing structure 13 is connected to the bottom plate 11 by welding, which is convenient and reliable, and ensures that the reinforcing structure 13 and the bottom plate 11 are fixed, stable and firm.

[0118] In one embodiment of the present application, as shown in FIG5 , the reinforcement structure 13 may be a frame structure and include: a first reinforcement member 131 and a second reinforcement member 132. There are two first reinforcement members 131, which extend along the first direction and are spaced apart in the second direction; the second reinforcement member 132 extends along the second direction and is connected to the two first reinforcement members 131 at both ends.

[0119] The first reinforcement 131 can be a sheet metal stamping part. The material of the first reinforcement 131 can be processed and manufactured using the same material as the base plate 11. In this embodiment, the first reinforcement 131 extends along the first direction. Specifically, the first reinforcement 131 can extend to both ends of the base plate 11 in the first direction. The first reinforcement 131 can be set at the edge of the base plate 11 in the second direction. The first reinforcement 131 can also be set between the two side edges of the base plate 11 in the second direction. The first reinforcement 131 can be integrally formed or spliced.

[0120] The second reinforcement 132 can be a sheet metal stamping part. The material of the second reinforcement 132 can be the same as that of the first reinforcement 131. The second reinforcement 132 can be integrally formed or spliced. The second reinforcement 132 and the first reinforcement 131 can be connected by welding. The second reinforcement 132 and the first reinforcement 131 can also be integrally formed.

[0121] In this embodiment, the reinforcement structure 13 is configured as a frame structure, which is lightweight, has good structural strength, and uses less material. This reduces the overall weight of the lower case 10, thereby improving the weight energy density of the battery pack 1000 to a certain extent. In this embodiment, a first reinforcement member 131 extending along a first direction and a second reinforcement member 132 extending along a second direction are provided. The first reinforcement member 131 and the second reinforcement member 132 cooperate to effectively reinforce the bottom plate 11 in the first and second directions, ensuring that the bottom plate 11 can be more stably and reliably supported and fixed to the reinforcement structure 13 after being connected.

[0122] In some examples of the present application, as shown in FIG. 5 , there may be a plurality of second reinforcement members 132 , and the plurality of second reinforcement members 132 are arranged at intervals along the first direction.

[0123] For example, the number of the second reinforcement members 132 can be two, three, four, five, six, etc. The plurality of second reinforcement members 132 can be evenly spaced along the second direction, or can be spaced at different intervals along the second direction. The arrangement positions of the second reinforcement members 132 in the second direction can be reasonably and flexibly arranged according to the reinforcement requirements of the bottom plate 11.

[0124] In this embodiment, multiple second reinforcement members 132 are provided and the multiple second reinforcement members 132 are arranged along the first direction, so that the second reinforcement members 132 can more comprehensively cover the extension range of the base plate 11 in the first direction, so that the base plate 11 can obtain stable and reliable structural reinforcement, and the overall structural distribution of the reinforcement structure 13 and the base plate 11 is more uniform and reasonable.

[0125] In some examples of the present application, as shown in Figure 6, the first reinforcement 131 may include: a first plate portion 1311 and a second plate portion 1312, the first plate portion 1311 is vertically arranged, the second plate portion 1312 is connected to the lower end of the first plate portion 1311 and extends along the second direction toward the second reinforcement 132 until it is connected to the second reinforcement 132, and the bottom plate 11 is arranged between the two first plate portions 1311 of the two first reinforcements 131.

[0126] The first plate portion 1311 is disposed vertically, and its vertical length can match the vertical length of the first connecting edge 112 of the bottom plate 11. Specifically, the upper end surface of the first plate portion 1311 can be higher, equal to, or lower than the upper end surface of the first connecting edge 112. The length of the second plate portion 1312 extending along the second direction can be set according to the reinforcement requirements of the bottom plate 11. The first reinforcement member can be formed by bending a single piece of metal plate to form the first plate portion 1311 and the second plate portion 1312, or the first plate portion 1311 and the second plate portion 1312 can be independent plate structures and welded together to form the first reinforcement member 131.

[0127] In this embodiment, the first plate portion 1311 is arranged vertically, and the second plate portion 1312 extends along the second direction toward the second reinforcement 132. An angle is formed between the first plate portion 1311 and the second plate portion 1312. When the bottom plate 11 is connected and fixed to the first reinforcement 131, the bottom of the bottom plate 11 on both sides in the second direction is supported on the upper surface of the second plate portion 1312, and the first connecting edge 112 formed on both sides of the bottom plate 11 in the second direction is stacked with the first plate portion 1311 in the second direction.

[0128] In this embodiment, the first reinforcement 131 includes a first plate portion 1311 arranged vertically and a first plate portion 1311 extending along the second direction. The first plate portion 1311 and the second plate portion 1312 are used to reinforce the bottom and edges of the bottom plate 11 on both sides of the second direction, and the first connecting edge 112 of the bottom plate 11 can be well structurally reinforced, so that the connection and fixation of the bottom plate 11 with the upper box body 20 is more stable and reliable when assembled and fixed.

[0129] In an example of the present application, as shown in Figure 6, the end of the second plate portion 1312 facing away from the first plate portion 1311 can be formed with a first folded edge 1313 extending upward, and a groove is defined between the first folded edge 1313 and the first plate portion 1311. The two side edges of the bottom plate 11 in the second direction are formed with first connecting edges 112 extending vertically, the first connecting edge 112 is arranged in the groove, and the first connection portion is formed on the first connecting edge 112.

[0130] An upwardly extending first folded edge 1313 is formed at one end of the second plate portion 1312 facing away from the first plate portion 1311, that is, an upwardly extending first folded edge 1313 is formed at one end of the second plate portion 1312 connected to the second reinforcement 132. The first folded edge 1313 extends upward and is connected to the second reinforcement 132. The first folded edge 1313 cooperates with the first plate portion 1311 and the second plate portion 1312 to define a groove.

[0131] In this embodiment, the second plate portion 1312 is formed with a first folded edge 1313, which cooperates with the first plate portion 1311 to define a groove, so that when the base plate 11 is connected and fixed to the reinforcement structure 13, the first connecting edge 112 can be positioned and fitted in the groove more quickly and conveniently, thereby facilitating the assembly and connection of the base plate 11 and the reinforcement structure 13.

[0132] In some specific embodiments of the present application, as shown in Figure 6, a plurality of avoidance holes 101 can be formed on the first plate portion 1311 and pass through the first plate portion 1311 along the second direction. The plurality of avoidance holes 101 correspond one-to-one to the plurality of first connection portions, and the avoidance holes 101 and the corresponding first connection portions are opposite to each other in the second direction so that the first connection portions are exposed.

[0133] The shape of the avoidance hole 101 can be matched with the shape of the first connecting part. When the lower box body 10 and the upper box body 20 are assembled, the first connecting part formed on the bottom plate 11 leaks out from the avoidance hole 101 along the second direction, and the fastener cooperates with the first connecting part from the outside of the first plate portion 1311 to fix the upper box body 20 and the bottom plate 11, thereby assembling and fixing the lower box body 10 and the upper box body 20.

[0134] In this embodiment, a plurality of avoidance holes 101 corresponding to the first connection parts are provided on the first plate part 1311 , so as to facilitate the cooperation between the first connection part on the bottom plate 11 and the fastener.

[0135] In some specific embodiments of the present application, as shown in Figure 6, the upper end of the first folded edge 1313 can be formed with a second folded edge 1314 extending away from the first plate portion 1311 along the second direction, and the second folded edge 1314 is overlapped on the upper side surface of the second reinforcement 132.

[0136] The second folded edge 1314 extends along the second direction toward the second reinforcement 132. When the first reinforcement 131 and the second reinforcement 132 are welded and fixed, the second folded edge 1314 overlaps the upper surface of multiple second reinforcements 132 and is welded to the second reinforcement 132. The length dimension of the second folded edge 1314 in the second direction can be reasonably set according to the welding and fixing requirements.

[0137] In this embodiment, by forming a second folding edge 1314 extending along the second direction at the upper end of the first folding edge 1313, the structural strength of the second plate portion 1312 can be improved, so that the first reinforcement 131 can play a better structural reinforcement role on the bottom plate 11. To a certain extent, the first reinforcement 131 can use less material during design and manufacturing, thereby better meeting the lightweight requirements of the lower box body 10. The provision of the second folding edge 1314 can enable the first reinforcement 131 and the second reinforcement 132 to have a good matching overlap surface when they are connected and fixed, making the connection and fixation of the first reinforcement 131 and the second reinforcement 132 more convenient and stable.

[0138] In some examples of the present application, both the first reinforcement 131 and the second reinforcement 132 may be sheet metal parts.

[0139] The first reinforcement 131 and the second reinforcement 132 can be made of metal plates such as steel plates and aluminum alloys through sheet metal forming by stamping, curling, bending, ironing or laser cutting to form the first plate portion 1311, the second plate portion 1312 and the first folding edge 1313 and the second folding edge 1314 on the first reinforcement 131.

[0140] In this embodiment, the first reinforcement 131 and the second reinforcement 132 are both set as sheet metal parts, so that the first reinforcement 131 and the second reinforcement 132 are easy to form, easy to process, and have low manufacturing costs. The first reinforcement 131 and the second reinforcement 132 after processing are light in weight and high in structural strength, so that they can play a good structural reinforcement role for the bottom plate 11 and meet the need for lightweighting the lower box 10, thereby greatly improving the weight energy density of the battery pack 1000.

[0141] In one embodiment of the present application, as shown in FIG6 , a second connecting nut 123 may be embedded in the second connecting hole.

[0142] A second connecting nut 123 is embedded in the second connecting hole. This second connecting nut 123 can be a rivet nut, which is fixed to the second connecting hole by riveting. When the lower case 10 and the upper case 20 are assembled and fixed, a fastener extends from the outside of the upper case 20 into the second connecting hole and screws with the second connecting nut 123, thereby screwing the upper case 20 to the first side panel 12 in the circumferential direction of the first side panel 12. Alternatively, the second connecting nut 123 can be a conventional hexagonal nut and secured to the second connecting hole by welding.

[0143] In this embodiment, a second connecting nut 123 is embedded in the position of the second connecting hole, so that when the lower box body 10 and the upper box body 20 are assembled and fixed, a fastener can be extended from the outside into the second connecting hole and cooperate with the second connecting nut 123 to screw the lower box body 10 and the upper box body 20, making the connection and fixation of the lower box body 10 and the upper box body 20 more convenient and easy.

[0144] In some embodiments of the present application, as shown in FIG5 , the housing 100 may further include a heat exchange element 14 , which is fixed on the bottom plate 11 and located on the upper side of the bottom plate.

[0145] Specifically, the heat exchange element 14 includes a flat tube and a branch pipe. There are multiple flat tubes, which extend along the first direction and are arranged at intervals in the second direction. There are two branch pipes, which are respectively arranged at the two ends of the flat tube in the first direction, and the two ends of the multiple flat tubes are respectively connected to the two branch pipes.

[0146] In this embodiment, a heat exchanger 14 is fixed on the bottom plate 11. The heat exchanger 14 can effectively dissipate heat for the battery cells in the battery pack 1000. Fixing the heat exchanger to the bottom plate can make it easier and more stable to fix the heat exchanger 14 on the bottom plate 11, and make the installation and arrangement of the heat exchanger 14 in the box 100 more convenient and easier.

[0147] The box 100 according to the second embodiment of the present application is described below with reference to Figures 2 to 6.

[0148] As shown in Figures 2 to 6, the box body 100 according to the embodiment of the present application includes a lower box body 10 and an upper box body 20 according to the embodiment of the first aspect of the present application. The upper box body 20 includes a top plate 21 and a second side plate 22, and the second side plates 22 are two. The two second side plates 22 are respectively connected to the two ends of the top plate 21 in the first direction and extend downward. The top plate 21 and the two second side plates 22 cooperate to form an upper box body 20 with openings at both ends in the first direction, wherein the lower end of the second side plate 22 is connected to the first connecting portion, and the two first side plates 12 respectively cover the two side openings of the upper box body 20 in the first direction.

[0149] The two second side panels 22 of the upper box body 20 cooperate with the two first side panels 12 of the lower box body 10 to surround the circumference of the bottom plate 11. The first side panels 12, the second side panels 22 and the bottom plate 11 form the main structure of the box body 100 and cooperate with the top plate 21 to form the accommodating cavity of the box body 100. When the lower box body 10 and the upper box body 20 are assembled, the two side openings of the upper box body 20 are respectively connected and fixed to the first side panels 12 by fasteners, and the lower ends of the two second side panels 22 are respectively connected and fixed to the first connecting edges 112 of the bottom plate 11 by fasteners. The top plate 21 and the second side panels 22 can be processed and manufactured by an integral molding method, and the upper box body 20 can be processed and manufactured using plastic, aluminum alloy, steel, stainless steel, etc. Optionally, the upper box body 20 is a plastic part.

[0150] According to the box body 100 of the embodiment of the present application, by setting the lower box body 10 of the above-mentioned first aspect embodiment, the lower box body 10 is provided with two first side panels 12, and the lower end of the first side panel 12 is fully welded to one end of the bottom plate 11 in the first direction, and the two side edges of the bottom plate 11 in the second direction form a first connection portion fixed to the upper box body 20, so that the lower box body 10 can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0151] In some embodiments of the present application, as shown in Figure 2, the box body 100 may further include a seal 30, which includes a first sealing portion and a second sealing portion. The first sealing portion is provided with two and is respectively located at the two ends of the second sealing portion in the first direction, and the first sealing portion extends along the second direction. The second sealing portion is provided with two, and the two second sealing portions extend along the first direction and are arranged at intervals in the second direction. One of the second sealing portions is connected to one end of the two first sealing portions in the second direction at both ends of the first direction, and the other second sealing portion is connected to the other end of the two first sealing portions in the second direction at both ends of the first direction, so that the first sealing portion is connected to the two ends of the second sealing portion in the second direction and forms a ring with the second sealing portion. The first sealing portion is provided between the upper box body 20 and the first connecting edge 112, and the second sealing portion is provided between the upper box body 20 and the second connecting edge 122.

[0152] The sealing member 30 may be a sealant or a sealing gasket. The first sealing portion may be provided on one side of the first connection hole in the up-down direction, or the first sealing portion may cover the vertical surface of the first connection edge 112. The second sealing portion may be provided on one side of the second connection hole in the first direction, or the second sealing portion may cover the surface of the second connection edge 122. Optionally, the sealing member 30 is a sealing gasket.

[0153] In this embodiment, a seal 30 is provided at the connection position between the upper box body 20 and the lower box body 10, which can effectively seal the box body 100, so that the accommodating cavity formed by the lower box body 10 and the upper box body 20 can be reliably sealed, thereby allowing the battery cells and other components in the box body 100 to be in a good operating environment, making the battery pack 1000 operate more stably.

[0154] The battery pack 1000 according to the third embodiment of the present application is described below with reference to Figures 2 to 6.

[0155] As shown in FIG. 2 to FIG. 6 , the battery pack 1000 according to an embodiment of the present application includes a box body 100 according to an embodiment of the second aspect of the present application.

[0156] Other structures and operations of the box 100 according to the embodiment of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0157] According to the battery pack 1000 of the embodiment of the present application, the battery pack 1000 is provided with a box body 100 of the above-mentioned second aspect embodiment, and the box body 100 is provided with two first side panels 12. The lower end of the first side panel 12 is fully welded to one end of the bottom plate 11 in the first direction, and the edges on both sides of the bottom plate 11 in the second direction form a first connection portion fixed to the upper box body 20, so that the lower box body 10 can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0158] The following describes an electrical device 10000 according to an embodiment of the fourth aspect of the present application with reference to Figures 1 to 6.

[0159] As shown in Figures 1 to 6, the power-consuming device 10000 according to an embodiment of the present application includes a battery pack 1000 according to an embodiment of the third aspect of the present application.

[0160] Other structures and operations of the electrical device 10000 according to the embodiment of the present application are known to those skilled in the art and will not be described in detail here.

[0161] According to the electrical device 10000 of the embodiment of the present application, by setting the battery pack 1000 of the above-mentioned third aspect embodiment, two first side panels 12 are provided in the battery pack 1000, and the lower end of the first side panel 12 is fully welded to one end of the bottom panel 11 in the first direction, and the edges on both sides of the bottom panel 11 in the second direction form a first connection portion fixed to the upper box body 20, so that the lower box body 10 can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0162] An electric device 10000 according to a specific embodiment of the present application will be described below with reference to FIG. 1 to FIG. 6 .

[0163] As shown in Figures 1 to 6, the electrical device 10000 is a vehicle, which includes a battery pack 1000, a controller 2000 and a motor 3000. The controller 2000 is electrically connected to the motor 3000 and the battery pack 1000, and the battery pack 1000 is electrically connected to the motor 3000.

[0164] The battery pack 1000 includes a box body 100, which is provided with a lower box body 10, an upper box body 20 and a sealing member 30. The lower box body 10 includes two first side panels 12, a bottom plate 11 and a reinforcement structure 13. The bottom plate 11 extends along a first direction. The two first side panels 12 are vertically arranged and are respectively arranged at the two ends of the bottom plate 11 in the first direction. The two ends of the bottom plate 11 are formed with support plates 111. The lower end of the first side panel 12 is formed with a connecting flange 121 extending along the first direction toward the bottom plate 11. The connecting flange 121 overlaps the support plate 111 and is fully welded to the support plate 111 in the second direction. The bottom plate 11 is formed with first connecting edges 112 on both sides of the second direction. The first connecting edges 112 extend vertically upward. A first connecting hole is formed on the first connecting edge 112. The first connecting hole is provided with a first connecting nut 113. The first connecting nut 113 is a rivet nut. The water cooling structure 14 is fixed to the bottom plate 11.

[0165] The reinforcement structure 13 includes a first reinforcement member 131 and a second reinforcement member 132. The first reinforcement member 131 extends along the first direction and is welded to the first connecting edge 112. The first reinforcement member 131 is provided with an avoidance hole 101 for the rivet nut. Five second reinforcement members 132 are provided. The second reinforcement members 132 extend along the second direction and are welded to the first connecting edge 112 at both ends. The reinforcement structure 13 is welded to the base plate 11.

[0166] A second connecting edge 122 extending in the first direction toward the bottom plate 11 is formed on the circumference of the first side plate 12 . A second connecting hole is provided on the second connecting edge 122 . The second connecting hole is provided with a second connecting nut 123 . The second connecting nut 123 is a rivet nut.

[0167] The upper case 20 includes a top plate 21 and two second side plates 22. The top plate 21 extends in a first direction, and the top plate 21 extends downward on both sides in a second direction to form the second side plates 22. The seal 30 is a sealing ring and is disposed between the upper case 20 and the first and second connecting edges 112, 122. The water-cooling structure 14 is disposed on the bottom plate 11.

[0168] When the lower box body 10 is processed and manufactured, the reinforcing structure 13, the bottom plate 11 and the first side plate 12 are respectively processed and formed and then assembled. The reinforcing structure 13 is welded to the lower side of the bottom plate 11, and the first side plates 12 are respectively welded to the two ends of the bottom plate 11 in the first direction, thereby completing the production and manufacturing of the lower box body 10. This makes the processing and molding of the lower box body 10 simpler and easier, and makes the production and manufacturing of the lower box body 10 more flexible and convenient, saving production costs.

[0169] When the box body 100 is assembled, the water cooling structure 14 is arranged on the base plate 11, and the sealing ring is arranged on the first connecting edge 112 and the second connecting edge 122. The upper box body 20 cooperates with the first connecting edge 112 and the second connecting edge 122 of the lower box body 10 to clamp the sealing ring to form a good seal. The upper box body 20 and the lower box body 10 are threadedly connected by bolts passing through the first connecting hole and the second connecting hole and the rivet nut, thereby fastening the upper box body 20 to the lower box body 10.

[0170] In this embodiment, the lower box body 10 is provided with two first side panels 12, and the lower end of the first side panel 12 is fully welded to one end of the bottom plate 11 in the first direction, and the two side edges of the bottom plate 11 in the second direction form a first connection portion fixed to the upper box body 20, so that the lower box body 10 can be processed and formed more easily, and the production of the lower box body is more flexible and convenient and the production cost is lower.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A lower box for a battery pack, wherein: The lower box body comprises: A bottom plate (11), the bottom plate (11) extending along a first direction in a horizontal plane, first connecting portions being provided on both side edges of the bottom plate (11) in a second direction in the horizontal plane, the first connecting portions being used to connect to an upper box body (20) of a battery pack, the first direction intersecting with the second direction; A first side plate (12), wherein the number of the first side plates (12) is two and the first side plates (12) are respectively arranged at two ends of the bottom plate (11) in the first direction, the first side plates (12) are arranged vertically, and the lower ends of the first side plates (12) are fully welded to the bottom plate (11).

2. The lower box according to claim 1, wherein: A connecting flange (121) extending along the first direction toward the bottom plate (11) is formed at the lower end of the first side plate (12), and the connecting flange (121) is overlapped and welded to the bottom plate (11).

3. The lower box according to claim 2, wherein: The bottom plate (11) is provided with support plate portions (111) at both ends in the first direction, and the connecting flange (121) is supported on the upper surface of the support plate portion (111) and connected to the support plate portion (111).

4. The lower box according to any one of claims 1 to 3, wherein: At least one of the bottom plate (11) and the first side plate (12) is provided with a positioning structure, the positioning structure being used to position the first side plate (12) on the bottom plate (11), the positioning structure being formed as a positioning hole, a positioning column and / or a positioning surface.

5. The lower box according to any one of claims 1 to 4, wherein: The bottom plate (11) is provided with first connecting edges (112) extending vertically on both sides in the second direction, the first connecting portion is formed on the first connecting edge (112), the first connecting portion is formed as a first connecting hole and passes through the first connecting edge (112) in the second direction, the number of the first connecting holes is multiple, the multiple first connecting holes are arranged at intervals in the first direction, and the first connecting edge (112) is connected to the upper box body (20) by fasteners passing through the first connecting holes.

6. The lower box according to claim 5, wherein: A first connecting nut (113) is embedded in the first connecting hole.

7. The lower box according to any one of claims 5 and 6, wherein: The first connecting edge (112) is formed by bending the two side edges of the bottom plate (11) in the second direction upwards.

8. The lower box according to any one of claims 1 to 7, wherein: The lower box body further comprises: a reinforcing structure (13), wherein the reinforcing structure (13) is connected to the bottom plate (11) and is arranged on the lower side of the bottom plate (11).

9. The lower box according to claim 8, wherein: The reinforcement structure (13) is connected to the base plate (11) by welding.

10. The lower box according to any one of claims 8 and 9, wherein: The reinforcement structure (13) is a frame structure and comprises: A first reinforcement member (131), wherein the number of the first reinforcement members (131) is two, and the two first reinforcement members (131) extend along the first direction and are arranged at intervals in the second direction; A second reinforcement member (132), the second reinforcement member (132) extends along the second direction and has two ends respectively connected to the two first reinforcement members (131).

11. The lower box according to claim 10, wherein: There are a plurality of second reinforcement members (132), and the plurality of second reinforcement members (132) are arranged at intervals along the first direction.

12. The lower box according to any one of claims 10 and 11, wherein: The first reinforcement (131) comprises: a first plate portion (1311) and a second plate portion (1312), the first plate portion (1311) being vertically arranged, the second plate portion (1312) being connected to the lower end of the first plate portion (1311) and extending along the second direction toward the second reinforcement (132) until being connected to the second reinforcement (132), and the bottom plate (11) being arranged between the two first plate portions (1311) of the two first reinforcements (131).

13. The lower box according to claim 12, wherein: An end of the second plate portion (1312) that is away from the first plate portion (1311) is formed with a first folded edge (1313) extending upward, and a groove is defined between the first folded edge (1313) and the first plate portion (1311). The bottom plate (11) has first connecting edges (112) extending vertically formed on both sides in the second direction, the first connecting edges (112) are arranged in the groove, and the first connecting portion is formed on the first connecting edges (112).

14. The lower box according to claim 13, wherein: A plurality of avoidance holes (101) are formed on the first plate portion (1311) and penetrate the first plate portion (1311) along the second direction. The plurality of avoidance holes (101) correspond one-to-one to the plurality of first connecting portions. The avoidance holes (101) and the corresponding first connecting portions are directly opposite to each other in the second direction so that the first connecting portions are exposed.

15. The lower case according to any one of claims 13 and 14, wherein: A second folded edge (1314) extending away from the first plate portion (1311) along the second direction is formed at the upper end of the first folded edge (1313), and the second folded edge (1314) is overlapped on the upper surface of the second reinforcement member (132).

16. The lower box according to any one of claims 10 to 15, wherein: The first reinforcement member (131) and the second reinforcement member (132) are both sheet metal members.

17. The lower box according to any one of claims 1 to 16, wherein: A connecting flange (121) extending along the first direction toward the bottom plate (11) is formed at the lower end of the first side plate (12), and the connecting flange (121) is welded to the bottom plate (11). A second connecting edge (122) extending along the first direction is formed on the circumference of the first side plate (12), the second connecting edge (122) extending along the circumference of the first side plate (12) and having two ends respectively connected to two ends of the connecting flange (121) in the second direction. A plurality of second connection holes are formed on the second connection edge (122), and the plurality of second connection holes are arranged at intervals along the circumference of the first side plate (12), and the second connection edge (122) is connected to the upper box body (20) by fasteners passing through the second connection holes.

18. The lower box according to claim 17, wherein: A second connecting nut (123) is embedded at the position of the second connecting hole.

19. A box, wherein: include: The lower box according to any one of claims 1-18; An upper box body (20), the upper box body (20) comprising a top plate (21) and a second side plate (22), the second side plates (22) being two, the two second side plates (22) being respectively connected to two ends of the top plate (21) in the first direction and extending downward, the top plate (21) and the two second side plates (22) cooperate to form the upper box body (20) with two ends opened in the first direction, The lower end of the second side plate (22) is connected to the first connecting portion, and the two first side plates (12) respectively cover the openings on both sides of the upper box body (20) in the first direction.

20. A battery pack, wherein: Comprising a housing according to claim 19.

21. An electrical device, wherein: Comprising a battery pack according to claim 20.

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