Side beam components, battery devices and electrical equipment

Abstract

The present application discloses a side beam assembly, a battery device and an electrical device, and relates to the field of battery technology. The battery device includes a battery box and a battery cell arranged in the battery box. The battery box includes a side beam assembly, and the side beam assembly includes at least two side beams and a connection structure. At least two side beams are connected in pairs, and the ends of the side beams are provided with welding grooves. In the two side beams connected to each other, the welding grooves of the two side beams are spliced ​​and set as welding grooves, and the welding grooves are filled with weld beads. The two side beams connected to each other are connected by at least one connection structure. The technical solution provided by the present application can solve the problem of low connection strength at the welding point of the two connected side beams.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a side beam assembly, a battery device and an electrical equipment. Background Art

[0002] The battery device includes a battery box and a battery cell contained in the battery box. The battery box usually includes a frame, which is welded by multiple side beams and cross beams. However, when multiple side beams and cross beams are welded into a frame, the connection strength of the welding point between two connected side beams is low. Utility Model Content

[0003] In view of the above problems, the present application provides a side beam assembly, a battery device and an electrical equipment, aiming to solve the problem of low connection strength at the welding point of two connected side beams.

[0004] The present application provides a battery device, including a battery box and a battery cell arranged in the battery box, the battery box including a side beam assembly, the side beam assembly including at least two side beams and a connecting structure; at least two side beams are connected in pairs, and welding grooves are provided at the ends of the side beams. In the two side beams connected to each other, the welding grooves of the two side beams are spliced ​​to form a welding groove, and the welding groove is filled with a weld bead; the two side beams connected to each other are connected by at least one connecting structure.

[0005] In the technical solution of the embodiment of the present application, the technical solution of the present application uses a weld bead to fill the welding groove of two mutually connected side beams to achieve welding of the two side beams, and adds a connecting structure between the two mutually connected side beams to enhance the connection strength between the two side beams by using the connecting structure, thereby solving the problem of low connection strength at the weld of the two connected side beams. In addition, a welding groove is provided at the end of the side beam so that the welding grooves of the two mutually connected side beams can be spliced ​​into a welding groove, so that the weld bead is filled in the welding groove, so that the weld bead does not protrude from the outer surface of the side beam, thereby eliminating the subsequent process of grinding the weld bead, and eliminating the process of cleaning the battery box as a whole due to grinding, thereby reducing costs.

[0006] In some embodiments, the connection structure is a mortise and tenon structure, which includes a tenon and a mortise that cooperate with each other. In two side beams connected to each other, a tenon is provided at the end of one side beam, and a mortise is provided at the end of the other side beam. Such a design, by using the mortise and tenon structure to connect the two side beams, is more convenient to achieve the connection between the two side beams, and can effectively enhance the connection strength between the two side beams. In addition, it can also withstand a large load and allow a certain amount of deformation. Under a vibration load, a certain amount of vibration energy is offset by deformation, thereby reducing the vibration response of the structure and improving the anti-seismic effect of the battery device.

[0007] In some embodiments, the tenon includes a first connecting section and a second connecting section; the first connecting section is embedded in one of the side beams; the second connecting section is connected to the first connecting section and is arranged at an angle with the first connecting section, the second connecting section protrudes from the end of the side beam and cooperates with the mortise of the other side beam. In such a design, by adopting the first connecting section to be embedded in one of the side beams and making the second connecting section protrude from the end of the side beam, during the splicing process, the two side beams can be pre-connected by inserting the second connecting section protruding from the end of the side beam into the mortise of the other side beam, and at the same time, the welding grooves of the two side beams are spliced ​​into a welding groove, and then the solder is filled in the welding groove. After the solder cools and solidifies, a weld bead can be formed in the welding groove, so that the connection of the two side beams can be achieved by using the tenon and mortise structure and the weld bead.

[0008] In some embodiments, the outer surface of the weld bead away from the bottom of the welding groove is lower than the outer surface of the side beam. With such a design, when the weld bead is contained in the welding groove, the weld bead will not protrude from the sealing surface of the side beam, so there is no need to grind the weld bead, thereby eliminating the subsequent process of grinding the weld bead and the process of cleaning the entire battery box due to grinding, thereby reducing costs.

[0009] In some embodiments, a sealant layer is provided on the outer surface of the weld bead away from the bottom of the welding groove. With such a design, after welding is completed, a sealant is applied to the outer surface of the weld bead away from the bottom of the welding groove to form a sealant layer on the surface of the weld bead. The sealant layer can be used to improve the sealing between the two side beams, thereby improving the sealing of the battery box. In addition, since it is difficult to ensure the flatness of the surface of the weld bead, the design of the sealant layer can also fill the surface of the weld bead, which can improve the flatness of the appearance of the battery box.

[0010] In some embodiments, the outer surface of the sealant layer away from the weld is flush with the outer surface of the side beam. Such a design can make the appearance of the battery box more flat, so as to further improve the sealing of the battery box.

[0011] In some embodiments, the weld is a metal arc weld. Such a design, using MIG welding process to connect two side beams has the advantages of low welding cost, high production efficiency, simple operation, high weld crack resistance, small post-weld deformation, and small welding spatter; for example, the cost is only 40-50% of submerged arc welding and manual arc welding; the productivity is 1-4 times that of manual arc welding; the open arc method is used, and there is no limit on the thickness of the workpiece, and all-position welding can be performed and downward welding can be performed; the weld has low hydrogen and low nitrogen content; the angular deformation is 5 / 1000, and the unevenness is only 3 / 1000; when ultra-low carbon alloy welding wire or flux-cored welding wire is used, or in CO 2 Adding Ar can reduce welding spatter.

[0012] In some embodiments, the welding groove and the weld bead are both extended along the periphery of the end of the side beam. Such a design can form an annular welding groove at the periphery of the end of the side beam, and fill the annular weld bead in the annular welding groove, which can further improve the welding strength between the two connected side beams.

[0013] In some embodiments, four side beams are provided, and the four side beams are connected end to end in sequence. Such a design allows the four side beams to be connected end to end in sequence to form a quadrilateral frame, so that the frame, the upper cover and the bottom plate form a square column battery box, so that enough battery cells can be installed in the battery box.

[0014] The present application also provides a side beam assembly, which includes at least two side beams and a connecting structure; at least two side beams are connected in pairs, and welding grooves are provided at the ends of the side beams. In the two side beams connected to each other, the welding grooves of the two side beams are spliced ​​to form a welding groove, and the welding groove is filled with a weld bead; the two side beams connected to each other are connected by at least one connecting structure.

[0015] The present application also provides an electrical device, comprising the above-mentioned battery device.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 structures shown in these drawings without paying any creative work.

[0018] Figure 1 A top view of an embodiment of a side beam assembly of the present application;

[0019] Figure 2 This is a partial structural schematic diagram of an embodiment of a side beam assembly of the present application;

[0020] Figure 3 An exploded view of an embodiment of a battery device of the present application;

[0021] Figure 4 This is a schematic structural diagram of a vehicle according to an embodiment of the present application.

[0022] Description of Figure Numbers:

[0023]

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0027] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0028] Reference to "embodiments" herein 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 herein may be combined with other embodiments.

[0029] 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).

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] The battery device mentioned in this field is also called a battery. It can be divided into disposable batteries and rechargeable batteries according to whether it is rechargeable. The common types of rechargeable batteries are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries are currently widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have larger output and charging current, and also have a longer service life, but the cost is higher.

[0033] The battery described in the embodiments of the present application refers to a rechargeable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0034] The battery mentioned in the embodiments disclosed in this application refers to a single physical module including one or more battery cells to provide a predetermined voltage and capacity. Battery cells are the basic units in the battery, and can generally be divided into: cylindrical battery cells, rectangular battery cells and soft-pack battery cells according to the packaging method. The following will mainly focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0035] A battery cell includes a positive electrode sheet, a negative electrode sheet, an electrolyte and a separator. Lithium-ion battery cells mainly rely on the movement of lithium ions between the positive electrode sheet and the negative electrode sheet to work. In cylindrical battery cells, the film structure of three layers of material is wound into a cylindrical electrode assembly, while in rectangular battery cells, the film structure is wound or stacked into an electrode assembly with a roughly rectangular shape.

[0036] In a common battery cell structure, the battery cell includes a shell, an electrode assembly and an electrolyte. The electrode assembly is contained in the shell of the battery cell, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The shell includes a shell and an end cap. The shell includes a housing formed by a plurality of walls and an opening. The end cap is arranged at the opening to close the housing chamber. In addition to the electrode assembly, the housing chamber also contains an electrolyte. The positive electrode sheet and the negative electrode sheet in the electrode assembly include tabs. In order to avoid passing a large current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. The tabs are electrically connected to the electrode terminals located outside the battery cell through connecting members, and the electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For a rectangular battery cell, the electrode terminal is generally arranged at the end cap portion. A plurality of battery cells are connected in series and / or in parallel via the electrode terminals for application in various applications.

[0037] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery generally includes a battery box for encapsulating one or more battery cells.

[0038] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a battery box and multiple battery cells contained in the battery box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety. At present, the mechanical safety of power batteries during use is one of the battery safety issues that consumers generally care about.

[0039] The battery provided in the embodiment of the present application can be a power source for electric devices. The electric devices can be mobile phones, portable devices, laptop computers, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. 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.

[0040] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0041] For example, Figure 4 This is a structural diagram of an embodiment of a vehicle 1000 of the present application. The vehicle 1000 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 battery device 100, a controller 200 and a motor 300 may be provided inside the vehicle 1000. The controller 200 is used to control the battery device 100 to power the motor 300. For example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power demand during the start, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0042] For example, see Figure 3 , Figure 3 An exploded view of the structure of a battery device 100 provided for some embodiments of the present application. The battery device 100 includes a battery case 10 and a battery cell 20, and the battery case 10 has a storage space for accommodating the battery cell 20. Among them, the battery case 10 can adopt a variety of structures. In some embodiments, the battery case 10 may include a first part 10a and a second part 10b, the first part 10a and the second part 10b cover each other, and the first part 10a and the second part 10b jointly define a storage space for accommodating the battery cell 20. The second part 10b may be a hollow structure with one end open, the first part 10a may be a plate-like structure, and the first part 10a covers the open side of the second part 10b, so that the first part 10a and the second part 10b jointly define a storage space; the first part 10a and the second part 10b may also be hollow structures with one side open, and the open side of the first part 10a covers the open side of the second part 10b. Of course, the battery box 11 formed by the first part 10a and the second part 10b can be in various shapes, such as a cylinder, a cuboid, etc.

[0043] In the battery device 100, there can be one or more battery cells 20. When the battery device 100 has multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the battery box 10; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the battery box 10.

[0044] The battery device includes a battery box and a battery cell contained in the battery box. The battery box usually includes a frame, which is welded from multiple side beams and cross beams. However, when multiple side beams and cross beams are welded into a frame, the connection strength at the weld of two connected side beams is low. For example, the welding connection strength is only 60% of the strength of the side beam itself. At the same time, in order to ensure the sealing between the frame, the upper cover and the bottom plate, the protruding part of the weld needs to be polished, which further reduces the connection strength of the side beam. Faced with complex working conditions of the whole vehicle, the risk of cracking and failure of the frame weld is frequent.

[0045] Based on the above problems, the present application proposes a battery device 100, which aims to solve the problem of low connection strength at the welding point of two connected side beams 111. The device 100 will be described in detail below with reference to specific drawings and embodiments.

[0046] See also Figure 1 , Figure 2 In one embodiment of the present application, the battery device 100 includes a battery box 10 and a battery cell 20 arranged in the battery box 10, the battery box 10 includes a side beam assembly 11, the side beam assembly 11 includes at least two side beams 111 and a connecting structure 113; at least two side beams 111 are connected in pairs, and welding grooves 11a are provided at the ends of the side beams 111. In the two side beams 111 connected to each other, the welding grooves 11a of the two side beams 111 are spliced ​​to form a welding groove a, and the welding groove a is filled with a weld bead 112; the two side beams 111 connected to each other are connected by at least one connecting structure 113.

[0047] The side beam 111 refers to the connecting beam used to form the frame in the battery box 10. The side beam 111 can be provided with two, three, four, five, six, seven, eight, etc., and the specific shape can be determined according to the shape of the frame as needed. The shape of the side beam 111 can include but is not limited to square, cylindrical, prismatic, etc. In some embodiments, the two side beams 111 arranged opposite to each other can also be connected by a cross beam 115, which can improve the reliability of the frame.

[0048] The welding groove 11a refers to a groove body formed on the periphery of the end of the side beam 111. When the ends of the two side beams 111 are spliced ​​together, the welding grooves 11a of the two side beams 111 can be spliced ​​into a larger groove body, which is a welding groove a for accommodating the weld 112. Solder can be poured into the welding groove a, and after the solder is cooled and solidified, the weld 112 can be formed in the welding groove a to weld and fix the two side beams 111 together. The cross-sectional shape of the welding groove 11a can include but is not limited to L-shaped, V-shaped, U-shaped, and the like.

[0049] The weld bead 112 refers to a structure that can weld two side beams 111 together. The two side beams 111 can be connected by welding processes such as MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), and CMT (Cold Metal Transfer) to form at least one of the MIG weld bead 112, TIG weld bead 112, and CMT weld bead 112 in the welding groove a.

[0050] The connection structure 113 refers to a structure used to connect the two side beams 111 , and the connection structure 113 may include but is not limited to mortise and tenon structures, pins, screws, buckles and other structures.

[0051] In summary, in the technical solution of the embodiment of the present application, the technical solution of the present application is to use a weld bead 112 to fill the welding groove a of the two side beams 111 connected to each other, so as to realize welding of the two side beams 111, and to add a connecting structure 113 between the two side beams 111 connected to each other, so as to adopt the connecting structure 113 to enhance the connection strength between the two side beams 111, thereby solving the problem of low connection strength at the welding point of the two connected side beams 111. In addition, a welding groove 11a is provided at the end of the side beam 111, so that the welding grooves 11a of the two side beams 111 connected to each other can be spliced ​​into a welding groove a, so that the weld bead 112 is filled in the welding groove a, so that the weld bead 112 does not protrude from the outer surface of the side beam 111, thereby eliminating the subsequent process of grinding the weld bead 112, and eliminating the process of cleaning the battery box 10 as a whole due to grinding, thereby reducing costs. Furthermore, since there is no need to grind the weld bead 112 , the problem of the weld bead 112 becoming thinner and having its strength reduced due to grinding can be avoided.

[0052] See also Figure 2 In one embodiment of the present application, the connection structure 113 is a mortise and tenon structure, which includes a tenon 1131 and a mortise 1132 that cooperate with each other. In two side beams 111 connected to each other, the end of one side beam 111 is provided with a tenon 1131, and the end of the other side beam 111 is provided with a mortise 1132.

[0053] The mortise and tenon structure is a concave-convex connection method used on two components. For example, the joint between the two side beams 111 is matched with the mortise and tenon to form a flexible frame. The protruding part is the tenon 1131, and the concave part is the mortise 1132. The tenon 1131 and the mortise 1132 bite together to play a connecting role.

[0054] Such a design, by using a mortise and tenon structure to connect the two side beams 111, is more convenient to achieve the connection between the two side beams 111, and can effectively enhance the connection strength between the two side beams 111. Moreover, it can also withstand a larger load and allow a certain deformation. Under a vibration load, a certain vibration energy can be offset by deformation, thereby reducing the vibration response of the structure and improving the seismic resistance of the battery device 100.

[0055] See also Figure 2 In one embodiment of the present application, the tenon 1131 includes a first connecting section 1131a and a second connecting section 1131b; the first connecting section 1131a is embedded in one side beam 111; the second connecting section 1131b is connected to the first connecting section 1131a and is arranged at an angle to the first connecting section 1131a, the second connecting section 1131b protrudes from the end of the side beam 111 and cooperates with the mortise 1132 of the other side beam 111.

[0056] In this embodiment, the first connecting segment 1131a and the second connecting segment 1131b may constitute an L-shaped tenon 1131. In some embodiments, the first connecting segment 1131a and the second connecting segment 1131b may be an integrally formed structure, which can not only improve the connection strength between the first connecting segment 1131a and the second connecting segment 1131b, but also simplify the preparation process.

[0057] Such a design, by adopting a first connecting section 1131a to be embedded in one of the side beams 111, and making the second connecting section 1131b protrude from the end of the side beam 111, during the splicing process, the second connecting section 1131b protruding from the end of the side beam 111 is inserted into the mortise 1132 of the other side beam 111, so that the two side beams 111 can be pre-connected, and at the same time, the welding grooves 11a of the two side beams 111 are spliced ​​into a welding groove a, and then solder is filled in the welding groove a. After the solder is cooled and solidified, a weld bead 112 can be formed in the welding groove a, so that the two side beams 111 can be connected by using the mortise and tenon structure and the weld bead 112.

[0058] See also Figure 2 In one embodiment of the present application, the outer surface of the weld bead 112 away from the bottom of the welding groove a is lower than the outer surface of the side beam 111.

[0059] It should be noted that the outer surface of the side beam 111 is a sealing surface, that is, the outer surface of the weld bead 112 is lower than the sealing surface, that is, the weld bead 112 does not protrude from the sealing surface of the side beam 111 .

[0060] With this design, when the weld bead 112 is accommodated in the welding groove a, the weld bead 112 will not protrude from the sealing surface of the side beam 111. Therefore, there is no need to grind the weld bead 112, thereby eliminating the subsequent process of grinding the weld bead 112 and eliminating the process of cleaning the entire battery box 10 due to grinding, thereby reducing costs.

[0061] See also Figure 2 In one embodiment of the present application, a sealant layer 114 is provided on the outer surface of the weld bead 112 away from the bottom of the welding groove a.

[0062] The sealant layer 114 refers to a sealant applied to the outer surface of the weld bead 112 away from the bottom of the welding groove a, and the sealant layer 114 is formed after the sealant solidifies, so that the weld bead 112 is covered with the sealant layer 114. The outer surface of the solidified sealant layer 114 can be flush with the outer surface of the side beam 111, or can be lower or higher than the outer surface of the side beam 111.

[0063] With such a design, after welding is completed, a sealant is applied to the outer surface of the weld bead 112 to form a sealant layer 114 on the surface of the weld bead 112. The sealant layer 114 can be used to improve the sealing between the two side beams 111, thereby improving the sealing of the battery box 10. In addition, since it is difficult to ensure the flatness of the surface of the weld bead 112, the design of the sealant layer 114 can also fill the surface of the weld bead 112, thereby improving the flatness of the appearance of the battery box 10.

[0064] See also Figure 2 In one embodiment of the present application, the outer surface of the sealant layer 114 away from the weld 112 is flush with the outer surface of the side beam 111. Such a design can make the appearance of the battery box 10 more flat, so as to further improve the sealing performance of the battery box 10.

[0065] See also Figure 2 In one embodiment of the present application, the weld bead 112 is a metal-metal gas shielded arc weld bead 112 .

[0066] The MIG weld bead 112 refers to the MIG welding process used to connect two side beams 111 to form the MIG weld bead 112 in the welding groove a.

[0067] Such a design, using MIG welding process to connect two side beams 111 has the advantages of low welding cost, high production efficiency, simple operation, high weld crack resistance, small deformation after welding, and small welding spatter; for example, the cost is only 40%~50% of submerged arc welding and manual arc welding; the productivity is 1~4 times that of manual arc welding; the open arc method is used, and there is no limit on the thickness of the workpiece, and all-position welding can be performed and downward welding can be performed; the weld has low hydrogen and low nitrogen content; the angular deformation is 5 / 1000, and the unevenness is only 3 / 1000; when ultra-low carbon alloy welding wire or flux-cored welding wire is used, or in CO 2 Adding Ar can reduce welding spatter.

[0068] See also Figure 2 In one embodiment of the present application, the welding groove a and the weld bead 112 are both extended along the periphery of the end of the side beam 111. That is, the outer side, inner side, upper side and lower side of the end of the side beam 111 are all provided with the welding groove a and the weld bead 112.

[0069] Such a design can form an annular welding groove a at the periphery of the end of the side beam 111 , so that the annular weld bead 112 is filled in the annular welding groove a, which can further improve the welding strength between the two connected side beams 111 .

[0070] See also Figure 1 In one embodiment of the present application, four side beams 111 are provided, and the four side beams 111 are connected end to end in sequence.

[0071] Such a design allows the four side beams 111 to be connected end to end in sequence to form a quadrilateral frame, so that the frame, the upper cover and the bottom plate form a square column battery box 10, so that enough battery cells 20 can be installed in the battery box 10.

[0072] See also Figure 1 , Figure 2 The present application also proposes a basin body assembly, which includes at least two side beams 111 and a connecting structure 113; at least two side beams 111 are connected in pairs, and welding grooves 11a are provided at the ends of the side beams 111. In the two mutually connected side beams 111, the welding grooves 11a of the two side beams 111 are spliced ​​into welding grooves a, and the welding grooves a are filled with weld beads 112; the two mutually connected side beams 111 are connected by at least one connecting structure 113.

[0073] According to some embodiments of the present application, the present application provides a battery device 100, see Figure 1 , Figure 2The battery device 100 includes a battery box 10 and a battery cell 20 arranged in the battery box 10. The battery box 10 includes a side beam assembly 11, and the side beam assembly 11 includes at least two side beams 111 and a mortise and tenon structure; at least two side beams 111 are connected in pairs, and welding grooves 11a are provided at the ends of the side beams 111. In the two side beams 111 connected to each other, the welding grooves 11a of the two side beams 111 are spliced ​​into a welding groove a, and the welding groove a is filled with a weld bead 112; the outer surface of the weld bead 112 is lower than the outer surface of the side beam 111, and the outer surface of the weld bead 112 is provided with a sealing glue layer 114; the mortise and tenon structure includes a tenon 1131 and a mortise 1132 that cooperate with each other. In the two side beams 111 connected to each other, the end of one side beam 111 is provided with a tenon 1131, and the end of the other side beam 111 is provided with a mortise 1132.

[0074] In the technical solution of the embodiment of the present application, the technical solution of the present application uses a weld bead 112 to fill the welding groove a of the two side beams 111 connected to each other, so as to realize welding of the two side beams 111, and adds a mortise and tenon structure between the two side beams 111 connected to each other, so as to adopt the mortise and tenon structure to enhance the connection strength between the two side beams 111, thereby solving the problem of low connection strength at the welding point of the two connected side beams 111. In addition, a welding groove 11a is provided at the end of the side beam 111, so that the welding grooves 11a of the two side beams 111 connected to each other can be spliced ​​into a welding groove a, so that the weld bead 112 is filled in the welding groove a, so that the outer surface of the weld bead 112 is lower than the outer surface of the side beam 111, so that the weld bead 112 does not protrude from the outer surface of the side beam 111, thereby eliminating the subsequent process of grinding the weld bead 112, and eliminating the process of cleaning the battery box 10 as a whole due to grinding, thereby reducing costs. In addition, after welding is completed, sealant is applied to the outer surface of the weld bead 112 to form a sealant layer 114 on the surface of the weld bead 112. The sealant layer 114 can be used to improve the sealing between the two side beams 111, thereby improving the sealing of the battery box 10; and, since it is difficult to ensure that the surface of the weld bead 112 is flat, the design of the sealant layer 114 can also fill the surface of the weld bead 112, which can improve the flatness of the appearance of the battery box 10.

[0075] The present application also proposes an electrical device, which includes a battery device 100. The specific structure of the battery device 100 refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0076] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: The invention comprises a battery box and a battery cell arranged in the battery box, wherein the battery box comprises a side beam assembly, and the side beam assembly comprises: At least two side beams, at least two of the side beams are connected in pairs, and the ends of the side beams are provided with welding grooves. In the two side beams connected to each other, the welding grooves of the two side beams are spliced ​​to form a welding groove, and the welding groove is filled with a weld bead; and A connecting structure, wherein the two side beams connected to each other are connected via at least one connecting structure.

2. The battery device according to claim 1, characterized in that The connection structure is a mortise and tenon structure, which includes a tenon and a mortise that cooperate with each other. Among the two side beams connected to each other, the end of one side beam is provided with the tenon, and the end of the other side beam is provided with the mortise.

3. The battery device according to claim 2, characterized in that: The tenon comprises: A first connecting section is embedded in one of the side beams; The second connecting section is connected to the first connecting section and is arranged at an angle with the first connecting section. The second connecting section protrudes from the end of the side beam and cooperates with the mortise of the other side beam.

4. The battery device according to any one of claims 1 to 3, characterized in that: The outer surface of the weld bead away from the bottom of the welding groove is lower than the outer surface of the side beam.

5. The battery device according to claim 4, characterized in that: A sealing adhesive layer is provided on the outer surface of the weld away from the bottom of the welding groove.

6. The battery device according to claim 5, characterized in that The outer surface of the sealant layer away from the weld is flush with the outer surface of the edge beam.

7. The battery device according to any one of claims 1 to 3, characterized in that: The weld is a metal-electrode gas shielded arc weld; And / or, the welding groove and the weld bead are both extended along the periphery of the end of the side beam.

8. The battery device according to any one of claims 1 to 3, characterized in that: There are four side beams, and the four side beams are connected end to end in sequence.

9. A side beam assembly, characterized in that: include: At least two side beams, at least two of the side beams are connected in pairs, the ends of the side beams are provided with welding grooves, in the two side beams connected to each other, the welding grooves of the two side beams are spliced ​​to form a welding groove, and the welding groove is filled with a weld bead; and A connecting structure, wherein the two side beams connected to each other are connected via at least one connecting structure.

10. An electrical device, characterized in that: A battery device comprising the battery device as claimed in any one of claims 1 to 8.

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