Battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, provides a battery device and electric equipment, and can improve the space utilization rate in a battery box body. The battery device comprises a plurality of single batteries and a box body, the box body is used for containing the single batteries, and the box body comprises edge beams and cross beams; the boundary beam extends along a first direction, the boundary beam comprises a boundary beam main body, the boundary beam main body comprises a first wall close to the battery monomer and a second wall far away from the battery monomer, the first wall and the second wall are oppositely arranged along a second direction, the first wall is provided with a first through hole penetrating through the first wall along the second direction, and the second direction is perpendicular to the first direction; the cross beam extends in the second direction, and the end of the cross beam in the second direction is connected with the first wall and the second wall through the first through hole.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery device and an electrical equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] At present, due to the consideration of the sealing of the battery, the connection between the crossbeam and the frame of the battery box is assembled by indirectly connecting the end face of the crossbeam with the inner side of the frame beam, which reduces the space utilization rate in the battery box. Therefore, how to improve the space utilization rate in the battery box has become an urgent problem to be solved. Utility Model Content

[0004] The embodiments of the present application provide a battery device and an electrical device, which can improve the space utilization rate in the battery box.

[0005] In a first aspect, a battery device is provided, comprising: a plurality of battery cells; and a box body, wherein the box body is used to accommodate the plurality of battery cells, the box body comprising side beams and cross beams; the side beams extend along a first direction, the side beams comprise a side beam body, the side beam body comprises a first wall close to the battery cells and a second wall away from the battery cells, the first wall and the second wall are arranged opposite to each other along a second direction, the first wall is provided with a first through hole penetrating the first wall along the second direction, and the second direction is perpendicular to the first direction; the cross beam extends along the second direction, and the end of the cross beam in the second direction is connected to the first wall and the second wall through the first through hole.

[0006] In the embodiment of the present application, the side beam of the box body extends along the first direction, and the side beam body includes a first wall and a second wall that are arranged opposite to each other, and the first wall is arranged close to the battery cell, and the second wall is arranged away from the battery cell, and the first wall is provided with a first through hole, so that the end of the cross beam of the box body in the second direction can be connected to the second wall through the first through hole, and the end of the cross beam in the second direction is connected to the first through hole while passing through the first through hole. In the technical solution of the present application, the cross beam of the box body is connected to the first wall and the second wall of the side beam through the first through hole on the side beam, so there is no need to reserve the space required for the weld formed by welding the end face of the end of the cross beam to the side of the first wall of the side beam located in the box body, and there is no need to design the first wall as a convex non-straight side wall, while improving the space utilization rate in the box body, the battery cell in the box body can be matched and placed with the first wall, which is conducive to improving the structural stability inside the battery device.

[0007] In a possible implementation, the side beam further includes a mounting portion, the mounting portion is fixedly connected to a side of the second wall away from the battery cell, and the mounting portion is used to connect the battery device to an external device.

[0008] In one possible implementation, the mounting portion includes a third wall attached to the second wall, the second wall includes a first area attached to the third wall and a second area connected to the first area, the first area protrudes away from the battery cell relative to the second area, a notch is provided at the connection between the first area and the second area, the end portion is welded to the second wall and the mounting portion at the notch to form a first weld, and the first weld seals the notch.

[0009] In the embodiment of the present application, the second wall includes a first area and a second area, the first area protrudes in a direction away from the battery cell relative to the second area, and a notch is provided at the connection between the first area and the second area. Thus, when the end of the crossbeam is connected to the second wall through the first through hole, since the first area protrudes in a direction away from the battery cell relative to the second area, the end of the crossbeam can be exposed through the notch, and then welded to the second wall and the mounting portion at the notch to achieve the connection between the crossbeam and the side beam, and at the same time, the first weld formed by the welding connection seals the notch to ensure the sealing of the battery box.

[0010] In a possible implementation, the first region is provided with a second through hole penetrating the second wall along the second direction, the second through hole is arranged opposite to the first through hole in the second direction, and the end surface of the end portion abuts against the third wall through the second through hole.

[0011] In an embodiment of the present application, a second through hole is provided in the first area of ​​the second wall, so that the end of the beam can abut against the third wall of the mounting portion through the second through hole. At the same time, the end of the beam passes through the second through hole and is inserted into the second wall, which can improve the connection stability between the beam and the side beam.

[0012] In a possible implementation, in the second direction, a size of the first region is smaller than a size of the second region, an end surface of the end portion abuts against the first region, and the end surface of the end portion is closer to the third wall than the second region.

[0013] In the embodiment of the present application, the first area of ​​the second wall is thinned so that the size of the first area is smaller than the size of the second area in the second direction, which can appropriately reduce the weight of the side beam and make the battery lightweight. In addition, the end surface of the end of the cross beam is closer to the third wall than the second area, which is conducive to the end of the cross beam being exposed through the notch, and is convenient for the cross beam end to be welded to the second wall and the mounting portion at the notch.

[0014] In a possible implementation, the second wall is provided with a third through hole penetrating the second wall along the second direction, the third through hole is arranged opposite to the first through hole in the second direction, and the end portion passes through the first through hole and the third through hole in sequence and extends into the mounting portion.

[0015] In the embodiment of the present application, the first wall and the second wall of the side beam body are both provided with through holes, and the end of the cross beam passes through the first through hole and the third through hole in sequence and extends into the installation part. That is to say, the end of the cross beam is plugged into the first wall and the second wall of the side beam body through the first through hole and the third through hole and extends into the installation part, which is beneficial to improving the connection stability between the cross beam and the side beam.

[0016] In a possible implementation manner, the end portion and the third through hole are welded to form a second weld, and the second weld seals the third through hole.

[0017] In the embodiment of the present application, welding the connection between the end of the beam and the third through hole is beneficial to improving the stability of the connection between the beam and the side beam. At the same time, the second weld formed by the welding connection seals the third through hole to ensure the sealing of the battery box.

[0018] In a possible implementation, the mounting portion is provided with an operation hole, and the operation hole is used to weld a connection between the end portion and the third through hole.

[0019] In the embodiment of the present application, an operating hole is provided on the mounting portion to facilitate welding operation at the connection between the end portion and the third through hole, thereby improving the ease of assembly of the battery box.

[0020] In a possible implementation, in a third direction, a size of the end portion is smaller than a size of other portions of the beam to form a step structure, and the third direction is perpendicular to the first direction and the second direction.

[0021] In the embodiment of the present application, the crossbeam is designed into a step structure by setting the size of the end portion to be smaller than the size of the other portions of the crossbeam. This facilitates the connection between the end portion of the crossbeam and the side beam while ensuring that the other portions of the crossbeam have sufficient height to improve the crash resistance of the battery and the overall structural strength.

[0022] In a second aspect, an electrical device is provided, comprising: the battery device described in the first aspect or any one embodiment of the first aspect, wherein the battery device is used to supply power to the electrical device.

[0023] In a possible implementation, the electrical equipment is a vehicle, a ship or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the exploded structure of a battery device according to one embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of a battery cell according to an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a battery device according to an embodiment of the present application;

[0029] Figure 5 for Figure 4 A partial schematic diagram of the cross section along the C-C' direction;

[0030] Figure 6 for Figure 4 A magnified view of part D in the middle;

[0031] Figure 7 This is a partial schematic diagram of a box according to an embodiment of the present application;

[0032] Figure 8 It is a partial schematic diagram of a box body of another embodiment of the present application;

[0033] Fig. 9 This is a partial schematic diagram of a box according to another embodiment of the present application;

[0034] Fig.10 This is a schematic structural diagram of a box body according to another embodiment of the present application;

[0035] Fig.11 for Fig.10 Enlarged view of part E in the middle;

[0036] Fig.12 for Fig.10 A partial schematic diagram of the cross section along the F-F' direction;

[0037] Fig.13 A partial exploded view of a battery device according to an embodiment of the present application.

[0038] In the drawings, the drawings are not drawn to scale.

[0039] Reference numerals:

[0040] 1-vehicle; 10-battery device; 20-battery cell; 25-electrode terminal; 26-housing; 30-controller; 40-motor; 11-housing; 12-side beam; 13-cross beam; 14-notch; 121-side beam body; 122-installation portion; 121a-first wall; 121b-second wall; 122a-third wall; 131-end; 111-first housing portion; 112-second housing portion; 251-positive electrode terminal; 252-negative electrode terminal; 1211-first through hole; 1212-second through hole; 1213-third through hole; 1221-operation hole; A-first area; B-second area; M-end face. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0044] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0048] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0049] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0051] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0052] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0053] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0054] The battery device mentioned in the embodiment of the present application may be a battery pack, which includes a box and a plurality of battery cells, wherein the battery cells are accommodated in the box. The plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0055] As an example, the box body may include a first box body portion and a second box body portion. The first box body portion and the second box body portion are buckled together to form a closed space inside the box body to accommodate the battery cells. The closed space here means covering or closing, which may be sealed or unsealed.

[0056] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cells.

[0057] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0058] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0059] In a battery device, a battery cell is contained in a battery case. Considering the sealing performance of the battery case, the connection between the crossbeam and the frame of the battery case is assembled by indirectly connecting the end face of the crossbeam to the inner side of the frame beam. For example, the end face of the crossbeam is welded or plugged to the inner side of the frame beam. This connection method requires a space reserved to accommodate the weld or block formed by the welding connection, so that the side wall of the frame beam close to the battery cell needs to be designed as a non-straight side wall protruding outside the case, which reduces the space utilization rate in the battery case. And because the inner side of the frame beam is non-straight, it cannot be directly attached to the battery cell, which will cause the structural stability of the battery cell in the case to be reduced. When the crossbeam is an expansion beam located at the end of the case, a support structure needs to be set to avoid cracking of the weld. The support structure will also occupy the space inside the case, reducing the space utilization rate in the battery case. Therefore, how to improve the space utilization rate in the battery case has become a problem to be solved urgently.

[0060] In view of this, the present application provides a battery device, the space utilization rate of the box of the battery device is improved. The battery device of the embodiment of the present application includes a plurality of battery cells and a box for accommodating the plurality of battery cells. The box includes a side beam extending along a first direction and a cross beam extending along a second direction, the side beam includes a side beam body, the side beam body includes a first wall close to the battery cell and a second wall away from the battery cell, the first wall is provided with a first through hole penetrating the first wall along the second direction, and the end of the cross beam in the second direction is connected to the first wall and the second wall through the first through hole. In this way, there is no need to reserve the space required for the weld formed by welding the end face of the end of the cross beam and the side of the first wall of the side beam located in the box, and there is no need to design the first wall as a convex non-straight side wall. While improving the space utilization rate in the box, the battery cells in the box can be matched and placed with the first wall, which is conducive to improving the structural stability inside the battery device.

[0061] The technical solutions described in the embodiments of the present application are applicable to various electrical equipment using battery devices.

[0062] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0063] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0064] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery device 10 may be provided inside the vehicle 1. The controller 30 is used to control the battery device 10 to supply power to the motor 40. For example, a battery device 10 may be provided at the bottom, front or rear of the vehicle 1. The battery device 10 may be used to supply power to the vehicle 1. For example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery device 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0065] For example. Figure 2 FIG. 1 shows a schematic diagram of the exploded structure of the battery device 10 according to an embodiment of the present application. Figure 2 As shown, the battery device 10 of the embodiment of the present application may include a plurality of battery cells 20 to meet different power requirements. The shape of the battery cell 20 of the embodiment of the present application may be set according to the actual application. For example, the battery cell 20 may be as follows: Figure 2 The rectangular parallelepiped shown in FIG. 1 may also be different from Figure 2 The cylinder or other shapes shown are not limited to these embodiments of the present application.

[0066] It should be understood that Figure 2 As shown, the battery device 10 of the embodiment of the present application may further include a box body 11, which may be used to accommodate a plurality of battery cells 20. The interior of the box body 11 of the embodiment of the present application is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11. The box body 11 may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are snapped together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the components accommodated inside. For example, they may be determined according to the shape of the combination of the plurality of battery cells 20 accommodated inside. At least one of the first box body part 111 and the second box body part 112 may have an opening. For example, as Figure 2As shown, the first box body 111 and the second box body 112 can both be hollow cuboids and each have an open face, the opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box body 11 with a closed chamber, and the chamber can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in mixed combination and placed in the box body 11 formed by the first box body 111 and the second box body 112 buckled together.

[0067] For example, unlike Figure 2 As shown, only one of the first box body 111 and the second box body 112 may be a hollow cuboid with an opening, while the other is in a plate shape to cover the opening. Taking the second box body 112 as a hollow cuboid with an opening and the first box body 111 as a plate, the first box body 111 covers the opening of the second box body 112 to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0068] Figure 3 The structure diagram of the battery cell 20 of the embodiment of the present application is shown. Figure 3 The battery cell 20 shown may be Figure 2 The battery device 10 shown includes any one of the battery cells 20. Figure 3 As shown, the battery cell 20 of the embodiment of the present application includes a shell 26, which may be a polyhedral structure. For example, the embodiment of the present application mainly takes the battery cell 20 as a rectangular parallelepiped as an example, that is, the shell 26 is a rectangular parallelepiped, but the embodiment of the present application is not limited thereto.

[0069] In the battery cell 20, the housing 26 is a hollow structure, the interior of which can be used to accommodate an electrode assembly, which is a component where electrochemical reactions occur in the battery cell 20. In addition, according to actual use requirements, the number of electrode assemblies in the housing 26 can be one or more.

[0070] It should be understood that the battery cell 20 of the embodiment of the present application may also include other components. For example, the housing 26 is also provided with an electrode terminal 25, and the electrode terminal 25 is used to electrically connect to the electrode assembly inside the battery cell 20 to output the electrical energy of the battery cell 20. Figure 3 As shown, the battery cell 20 may include at least two electrode terminals 25. The at least two electrode terminals 25 may be disposed on the same wall or different walls of the battery cell 20. For example, Figure 3In the example, the battery cell 20 includes two electrode terminals 25, and the two electrode terminals 25 are arranged on the same wall. The at least two electrode terminals 25 included in the battery cell 20 may include at least one positive electrode terminal 251 and a negative electrode terminal 252. The positive electrode terminal 251 can be directly or indirectly electrically connected to the positive electrode tab of the electrode assembly, for example, the positive electrode tab can be connected to the positive electrode terminal 251 through a connecting member; the negative electrode terminal 252 can be directly or indirectly electrically connected to the negative electrode tab of the electrode assembly, for example, the negative electrode tab is electrically connected to the negative electrode terminal 252 through another connecting member.

[0071] Figure 4 FIG. 1 is a schematic structural diagram of a battery device 10 according to an embodiment of the present application. Figure 5 for Figure 4 A partial schematic diagram of the cross section along the C-C' direction.

[0072] like Figure 4 As shown, the battery device 10 includes a plurality of battery cells 20 and a box body 11 for accommodating the plurality of battery cells 20 , and the box body 11 includes a side beam 12 extending along a first direction and a cross beam 13 extending along a second direction.

[0073] For ease of description, the embodiment of the present application defines three reference directions based on the rectangular battery device 10. The length direction of the battery device 10 is direction X, the width direction of the battery device 10 is direction Y, and the height direction of the battery device 10 is direction Z, wherein the length direction X, the width direction Y, and the height direction Z of the battery device 10 are perpendicular to each other. In the embodiment of the present application, the first direction may be direction X, the second direction may be direction Y, and the third direction (see description below) may be direction Z.

[0074] like Figure 4 and Figure 5 As shown, the side beam 12 includes a side beam body 121, and the side beam body 121 includes a first wall 121a close to the battery cell 20 and a second wall 121b away from the battery cell 20, wherein the first wall 121a and the second wall 121b are arranged opposite to each other along the direction Y. The first wall 121a is provided with a first through hole 1211, and the first through hole 1211 penetrates the first wall 121a along the direction Y. The end 131 of the cross beam 13 in the direction Y is connected to the first wall 121a and the second wall 121b through the first through hole 1211.

[0075] The material of the box body 11 in the embodiment of the present application may include one or more types, for example, it may include high-strength metal materials, such as aluminum alloy, steel, etc., to provide good structural strength and stability to ensure the safety of the battery device 10 in various environments; it may also include non-metallic materials with excellent insulation properties, such as engineering plastics, etc., which can reduce the possibility of safety hazards such as leakage of the battery device 10; it may also include materials with good thermal conductivity to facilitate the dissipation of heat when the battery device 10 is working and maintain the normal working temperature of the battery device 10.

[0076] In the embodiment of the present application, the side beam 12 of the box body 11 extends along the direction X, and the side beam body 121 includes a first wall 121a and a second wall 121b that are arranged opposite to each other, and the first wall 121a is arranged close to the battery cell 20, and the second wall 121b is arranged away from the battery cell 20, and a first through hole 1211 is arranged on the first wall 121a, so that the end of the cross beam 13 of the box body 11 in the direction Y can be connected to the second wall 121b through the first through hole 1211, and the end 131 of the cross beam 13 in the direction Y is connected to the first through hole 1211 while passing through the first through hole 1211. In the technical solution of the present application, the cross beam 13 of the box body 11 is connected to the first wall 121a and the second wall 121b of the side beam 12 through the first through hole 1211 on the side beam 12, so there is no need to reserve the space required for the weld formed by welding the end face of the end 131 of the cross beam 13 to the side of the first wall 121a of the side beam 12 located inside the box body 11, and there is no need to design the first wall 121a as a non-straight side wall that is convex outwards. While improving the space utilization rate inside the box body 11, the battery cells 20 in the box body 11 can be matched and placed with the first wall 121a, which is conducive to improving the structural stability inside the battery device 10. In addition, the cross beam 13 is inserted into the side beam 12 through the first through hole 1211, and the first wall 121a of the side beam 12 can also play a load-bearing role for the cross beam 13.

[0077] In some embodiments, the cross beam 13 may be a middle beam located in the middle of the battery box 11 , and the middle beam is disposed between the plurality of battery cells 20 .

[0078] In some embodiments, the cross beam 13 may be an expansion beam located at the end 131 of the battery box 11 , and the expansion beam is used to withstand the battery expansion force and disperse it, thereby ensuring the safety and stability of the battery.

[0079] In the prior art, after the end face of the expansion beam is welded or plugged to the inner side of the first wall 121a of the side beam 12, it is necessary to set support structures on both sides of the expansion beam to prevent the expansion force from damaging the weld or the plug. The setting of the support structure will occupy the space in the box body 11, resulting in a decrease in the space utilization rate in the box body 11. In the present application, the expansion beam is plugged into the side beam 12 through the first through hole 1211, and is connected to the first wall 121a and the second wall 121b of the side beam 12. The expansion force on the expansion beam can be transmitted to the first wall 121a and the second wall 121b. The first wall 121a can also provide support force to the expansion beam in the direction X, without the need to set up an additional support structure, thereby improving the space utilization rate in the box body 11.

[0080] In some embodiments, Figure 4 and Figure 5 As shown, the side beam 12 further includes a mounting portion 122 , which is fixedly connected to a side of the second wall 121 b away from the battery cell 20 , and is used to connect the battery device 10 to an external device.

[0081] In the embodiment of the present application, the mounting portion 122 can realize the connection between the battery device 10 and an external device. For example, the mounting portion 122 can be connected to the chassis of the electric vehicle through a connecting structure to provide a stable power supply for the electric vehicle, so that the vehicle can operate normally. The mounting portion 122 and the side beam body 121 jointly bear the external load.

[0082] Exemplarily, the mounting portion 122 and the side beam body 121 can be fixedly connected. For example, the mounting portion 122 and the side beam body 121 are independently formed, and then the mounting portion 122 is fixed to the side beam body 121 by a connection process such as welding, bolting or riveting.

[0083] Exemplarily, the mounting portion 122 and the side beam body 121 may be integrally formed, that is, the mounting portion 122 and the side beam body 121 are already an integral structure during the forming process and do not need to be fixedly connected.

[0084] like Figure 5 As shown, the mounting portion 122 includes a third wall 122a attached to the second wall 121b, the second wall 121b includes a first area A attached to the third wall 122a and a second area B connected to the first area A, and the first area A protrudes relative to the second area B in a direction away from the battery cell 20. Figure 6 As shown, a notch 14 is provided at the connection between the first area A and the second area B, and the end 131 is welded to the second wall 121 b and the mounting portion 122 at the notch 14 to form a first weld, which seals the notch 14 .

[0085] In the embodiment of the present application, the second wall 121b includes a first region A and a second region B, the first region A protrudes in a direction away from the battery cell 20 relative to the second region B, and a notch 14 is provided at the connection between the first region A and the second region B. In this way, when the end 131 of the crossbeam 13 is connected to the second wall 121b through the first through hole 1211, since the first region A protrudes in a direction away from the battery cell 20 relative to the second region B, the end 131 of the crossbeam 13 can be exposed through the notch 14, and thus can be welded to the second wall 121b and the mounting portion 122 at the notch 14, thereby realizing the connection between the crossbeam 13 and the side beam 12, and at the same time, the first weld formed by the welding connection seals the notch 14 to ensure the sealing of the box body 11.

[0086] In some embodiments, a sealant may be provided around the notch 14 to seal the notch 14 when the first weld cannot completely seal the notch 14 , thereby ensuring the sealing of the box body 11 .

[0087] In some embodiments, the second wall 121b and the third wall 122a are integrally formed, that is, the second wall 121b and the third wall 122a are a side wall. Figure 7 shown.

[0088] In some embodiments, Figure 8 As shown, the first region A is provided with a second through hole 1212 penetrating the second wall 121b along the direction Y. The second through hole 1212 is arranged opposite to the first through hole 1211 in the Y direction. The end surface M of the end portion 131 abuts against the third wall 122a through the second through hole 1212.

[0089] In the embodiment of the present application, a second through hole 1212 is provided in the first area A of the second wall 121b, so that the end 131 of the beam 13 can abut against the third wall 122a of the mounting portion 122 through the second through hole 1212. At the same time, the end 131 of the beam 13 passes through the second through hole 1212 and is inserted into the second wall 121b, which can improve the connection stability between the beam 13 and the side beam 12.

[0090] In some embodiments, Fig. 9 As shown, in the direction Y, the size L1 of the first area A is smaller than the size L2 of the second area B, the end surface M of the end 131 abuts against the first area A, and the end surface M of the end 131 is closer to the third wall 122a than the second area B.

[0091] In the embodiment of the present application, the first region A of the second wall 121b is thinned so that the size of the first region A is smaller than the size of the second region B in the direction Y, which can appropriately reduce the weight of the side beam 12, making the battery device 10 lightweight. In addition, the end surface of the end 131 of the cross beam 13 is closer to the third wall 122a than the second region B, which is conducive to the end 131 of the cross beam 13 being exposed through the notch 14, and facilitating the welding connection of the end 131 of the cross beam 13 with the second wall 121b and the mounting portion 122 at the notch 14.

[0092] Fig.10 This is a schematic structural diagram of a box body 11 according to another embodiment of the present application. Fig.11 for Fig.10 Magnified view of part E in FIG. Fig.12 for Fig.10 A partial schematic diagram of the cross section along the F-F' direction.

[0093] In some embodiments, reference Figures 10 to 12 The second wall 121b is provided with a third through hole 1213 penetrating the second wall 121b along direction Y. The third through hole 1213 is arranged opposite to the first through hole 1211 in direction Y. The end portion 131 passes through the first through hole 1211 and the third through hole 1213 in sequence and extends into the mounting portion 122.

[0094] In the embodiment of the present application, the first wall 121a and the second wall 121b of the side beam main body 121 are both provided with through holes, and the end 131 of the cross beam 13 passes through the first through hole 1211 and the third through hole 1213 in sequence and extends into the mounting portion 122. That is to say, the end 131 of the cross beam 13 is plugged into the first wall 121a and the second wall 121b of the side beam main body 121 through the first through hole 1211 and the third through hole 1213 and extends into the mounting portion 122, which is beneficial to improving the connection stability between the cross beam 13 and the side beam 12.

[0095] In some embodiments, the second through hole 1212 and the third through hole 1213 may be the same through hole.

[0096] In some embodiments, the connection between the end portion 131 and the third through hole 1213 is welded to form a second weld, and the second weld seals the third through hole 1213 .

[0097] In the embodiment of the present application, the end 131 of the beam 13 is welded to the connection between the third through hole 1213, which is beneficial to improving the stability of the connection between the beam 13 and the side beam 12. At the same time, the second weld formed by the welding connection seals the third through hole 1213 to ensure the sealing of the box body 11.

[0098] In some embodiments, a sealant may be further provided around the third through hole 1213 to seal the third through hole 1213 when the second weld cannot completely seal the third through hole 1213 , thereby ensuring the sealing of the box body 11 .

[0099] In some embodiments, Figures 10 to 12 As shown, the mounting portion 122 is provided with an operating hole 1221 , and the operating hole 1221 is used to weld the connection between the end portion 131 and the third through hole 1213 .

[0100] In the embodiment of the present application, an operation hole 1221 is provided on the mounting portion 122 to facilitate welding operation at the connection between the end portion 131 and the third through hole 1213 , thereby improving the ease of assembly of the box body 11 .

[0101] In some embodiments, the end surface M of the end portion 131 may abut against a side wall of the operation hole 1221 away from the battery cell 20 and be welded to the side wall.

[0102] In some embodiments, the shapes of the first through hole 1211 , the second through hole 1212 , and the third through hole 1213 match the shape of the end 131 of the beam 13 to ensure the sealing of the box body 11 .

[0103] In some embodiments, the shape of the operating hole 1221 can be a rectangular parallelepiped or a semi-cylindrical shape, which is not limited in the present application.

[0104] In some embodiments, reference Figures 4 to 12 In the third direction (direction Z), the size of the end portion 131 is smaller than the size of other portions of the beam 13 to form a step structure.

[0105] In the embodiment of the present application, the cross beam 13 is designed to be a step structure by setting the size of the end 131 to be smaller than the size of other parts of the cross beam 13. This facilitates the connection between the end 131 of the cross beam 13 and the side beam 12 while ensuring that other parts of the cross beam 13 have sufficient height to improve the crash resistance and overall structural strength of the battery device 10.

[0106] The following combination Fig.13 The process of assembling the box body 11 and a plurality of battery cells 20 to form the battery device 10 provided in the embodiment of the present application is briefly described.

[0107] First, multiple battery cells 20 are arranged neatly on the operating table (or arranged and assembled into a battery module), the side beams 12 are placed around the multiple battery cells 20, the cross beams 13 located in the middle of the box body 11 are placed between the multiple battery cells 20, and the cross beams 13 located at the ends of the box body 11 are placed around the multiple battery cells 20, and then the cross beams 13 are inserted into the side beams 12 through the first through holes 1211, and the side beams 12 and the cross beams 13 are adjusted to be close to the battery cells 20, so that the side walls of the side beams 12 located on the inner side of the box body 11 fit the battery cells 20, and after adjusting the positions of the side beams 12 and the cross beams 13, the ends 131 of the cross beams 13 are welded and connected to the side beam body 121 of the side beams 12. Then the upper box body and the lower box body are fixedly connected to the side beams 12 to form the battery device 10.

[0108] In the embodiment of the present application, the battery device 10 is assembled through the above operation, the operation steps are simple, and the battery cells 20 are accommodated while the boxes 11 are grouped on the assembly line, which is conducive to improving the assembly efficiency of the battery device 10.

[0109] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 battery device, characterized in that: include: A plurality of battery cells (20); and A box body (11), the box body (11) being used to accommodate the plurality of battery cells (20), the box body (11) comprising side beams (12) and a cross beam (13); The side beam (12) extends along a first direction, the side beam (12) comprises a side beam body (121), the side beam body (121) comprises a first wall (121a) close to the battery cell (20) and a second wall (121b) away from the battery cell (20), the first wall (121a) and the second wall (121b) are arranged opposite to each other along a second direction, the first wall (121a) is provided with a first through hole (1211) penetrating the first wall (121a) along the second direction, and the second direction is perpendicular to the first direction; The crossbeam (13) extends along the second direction, and an end (131) of the crossbeam (13) in the second direction is connected to the first wall (121a) and the second wall (121b) via the first through hole (1211).

2. The battery device according to claim 1, characterized in that: The side beam (12) further comprises a mounting portion (122), wherein the mounting portion (122) is fixedly connected to a side of the second wall (121b) away from the battery cell (20), and the mounting portion (122) is used to connect the battery device to an external device.

3. The battery device according to claim 2, characterized in that: The mounting portion (122) comprises a third wall (122a) attached to the second wall (121b), the second wall (121b) comprises a first region (A) attached to the third wall (122a) and a second region (B) connected to the first region (A), the first region (A) protrudes in a direction away from the battery cell (20) relative to the second region (B), a notch (14) is provided at the connection between the first region (A) and the second region (B), the end portion (131) is welded to the second wall (121b) and the mounting portion (122) at the notch (14) to form a first weld, and the first weld seals the notch (14).

4. The battery device according to claim 3, characterized in that: The first region (A) is provided with a second through hole (1212) penetrating the second wall (121b) along the second direction, the second through hole (1212) being arranged opposite to the first through hole (1211) in the second direction, and the end surface of the end portion (131) abuts against the third wall (122a) through the second through hole (1212).

5. The battery device according to claim 3, characterized in that: In the second direction, the size of the first area (A) is smaller than the size of the second area (B), the end surface of the end portion (131) abuts against the first area (A), and the end surface of the end portion (131) is closer to the third wall (122a) than the second area (B).

6. The battery device according to claim 2, characterized in that: The second wall (121b) is provided with a third through hole (1213) penetrating the second wall (121b) along the second direction; the third through hole (1213) is arranged opposite to the first through hole (1211) in the second direction; the end portion (131) passes through the first through hole (1211) and the third through hole (1213) in sequence and extends into the mounting portion (122).

7. The battery device according to claim 6, characterized in that: The connection between the end portion (131) and the third through hole (1213) is welded to form a second weld, and the second weld seals the third through hole (1213).

8. The battery device according to claim 7, characterized in that: The mounting portion (122) is provided with an operating hole (1221), and the operating hole (1221) is used to weld the connection between the end portion (131) and the third through hole (1213).

9. The battery device according to any one of claims 1 to 8, characterized in that: In a third direction, the size of the end portion (131) is smaller than the size of other portions of the crossbeam (13) to form a step structure, and the third direction is perpendicular to the first direction and the second direction.

10. An electrical device, characterized in that: It comprises the battery device as claimed in any one of claims 1 to 9, wherein the battery device is used to supply power to the electrical device.

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