Battery box, battery and electrical device

Abstract

The embodiment of the present application provides a battery case, a battery, and an electrical device. The case includes: a frame beam and a cross beam, the frame beam including a first surface and a slot with an opening located on the first surface. The cross beam includes a main body and ends located at both ends of the main body along its length direction, the ends include a protruding structure and a connecting surface located on the circumference of the protruding structure, the cross beam and the frame beam are engaged with the slot through the protruding structure, and are fixedly connected to the first surface through the connecting surface. In the embodiment of the present application, the protruding structure at the end of the cross beam is engaged with the slot, which can allow the force on the cross beam to be transmitted to the inside of the frame beam through the protruding structure, thereby increasing the force-bearing area between the frame beam and the cross beam, and further enhancing the strength of the battery case.

Description

Technical Field

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

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] With the development of electronic devices, higher requirements are placed on the safety performance of batteries integrated with battery cells and the impact resistance of electronic devices. Improving the strength of the battery case while facilitating installation and reducing costs is an urgent problem to be solved in battery technology. Summary of the invention

[0004] The present application provides a battery case, a battery, and an electrical device, which can improve the overall strength of the battery case.

[0005] In the first aspect, the embodiment of the present application provides a battery box, including: a frame beam and a cross beam, the frame beam including a first surface and a slot with an opening located on the first surface. The cross beam includes a main body and ends located at both ends of the main body along its length direction, the ends include a protruding structure and a connecting surface located on the periphery of the protruding structure, the cross beam and the frame beam are engaged with the slot through the protruding structure, and are fixedly connected to the first surface through the connecting surface.

[0006] In the above technical solution, by providing a slot on the frame beam, the cross beam is embedded in the slot to improve the strength of the connection between the frame beam and the cross beam, reduce the possibility of damage by the expansion force of the battery cell, and improve the safety of the battery box. The technical solution clips the protruding structure at the end of the cross beam into the slot, which can allow the force on the cross beam to be transmitted to the inside of the frame beam through the protruding structure, increase the force-bearing area between the frame beam and the cross beam, and further enhance the strength of the battery box.

[0007] In some embodiments, a minimum distance H between a bottom edge of the opening in the thickness direction of the box body and a bottom edge of the first surface satisfies the relationship: 10 mm ≤ H ≤ 100 mm.

[0008] In the above technical solution, if the minimum distance between the bottom edge of the opening and the bottom edge of the first surface is too small or too large, the closer the opening is to the edge of the frame beam, the lower the strength of the frame beam itself. The above technical solution limits the minimum distance between the bottom edge of the opening and the bottom edge of the first surface to 10mm≤H≤100mm to ensure the strength of the frame beam itself.

[0009] In some embodiments, the slot includes a plurality of sidewall surfaces, and the protruding structure is disposed in close contact with a portion of the sidewall surfaces of the plurality of sidewall surfaces.

[0010] In the above technical solution, the protruding structure is in close contact with a portion of the side wall surface so as to realize the snap connection between the protruding structure and the slot, thereby facilitating the subsequent fixed connection between the cross beam and the frame beam.

[0011] In some embodiments, the slot includes a plurality of sidewall surfaces, and a gap is provided between the protruding structure and another portion of the sidewall surfaces of the plurality of sidewall surfaces.

[0012] In the above technical solution, there is a gap between a portion of the side wall surface of the card slot and the protruding structure to ensure that the protruding structure can be more easily embedded in the card slot.

[0013] In some embodiments, the minimum thickness H1 of the protruding structure along the thickness direction of the beam satisfies 5 mm ≤ H1 ≤ 100 mm.

[0014] In the above technical solution, if the thickness of the protruding structure is too small, the force performance between the protruding structure and the frame beam will be reduced. If the thickness of the protruding structure is too large, the connection strength between the protruding structure and the cross beam will be reduced. The above technical solution limits the thickness of the protruding structure to 5mm≤H1≤100mm to ensure the force performance between the protruding structure and the frame beam and the connection strength between the protruding structure and the cross beam.

[0015] In some embodiments, the minimum distance between two opposite side wall surfaces of the slot along the extension direction of the frame beam is H2, and H1 and H2 satisfy the relationship: 0mm≤H2-H1≤1mm.

[0016] In the above technical solution, the minimum distance between the two side wall surfaces of the slot relative to each other along the extension direction of the frame beam and the two surfaces in the thickness direction of the protruding structure can be in close contact or have a gap to ensure that the protruding structure can be easily connected to the slot. If the gap is too large, the welding strength between the cross beam and the frame beam will be reduced. The above technical solution limits the relationship between the minimum distance between the two side wall surfaces of the slot relative to each other along the extension direction of the frame beam and the two surfaces in the thickness direction of the protruding structure to 0mm≤H2-H1≤1mm, so as to facilitate the assembly of the protruding structure and ensure the welding strength between the cross beam and the frame beam.

[0017] In some embodiments, the depth H3 of the slot along the thickness direction of the frame beam satisfies 5mm≤H3≤50mm.

[0018] In the above technical solution, the deeper the depth of the slot, the lower the strength of the frame beam itself, and the shallower the depth of the slot, the worse the force effect that the protruding structure can transmit to the slot. The above technical solution limits the depth of the slot to 5mm≤H3≤50mm, and increases the depth of the slot as much as possible while ensuring the strength of the frame beam itself.

[0019] In some embodiments, the distance between the end surface of the protruding structure along the protruding direction and the connecting surface is H4, and H3 and H4 satisfy the relationship, 0mm≤H4-H3≤10mm.

[0020] In the above technical solution, the closer the distance between the end face of the protruding structure and the connecting face along the protruding direction and the depth of the slot along the thickness direction of the frame beam are, the higher the process difficulty. The larger the distance between the end face of the protruding structure and the connecting face along the protruding direction and the depth of the slot along the thickness direction of the frame beam, the worse the force bearing performance between the protruding structure and the frame beam. The above technical solution limits the relationship between the protruding distance of the protruding structure and the depth of the slot to 0mm≤H4-H3≤10mm to balance the process and force bearing performance.

[0021] In some embodiments, the connecting surface is welded to the first surface.

[0022] In the above technical solution, the frame beam and the cross beam are fixedly connected by welding to improve the connection strength between the frame beam and the cross beam.

[0023] In some embodiments, the box body further includes a support plate, which is connected to the frame beam and encloses the frame beam to form a receiving cavity.

[0024] In the above technical solution, the accommodating cavity can accommodate a battery cell.

[0025] In some embodiments, the frame beam includes a limiting portion, which is disposed on a side of the opening away from the support plate and / or a side close to the support plate, and the connecting surface abuts against the limiting portion.

[0026] In the above technical solution, the limiting part limits the depth of the protruding structure embedded in the slot, avoiding the phenomenon that the protruding structure on one side of the beam is embedded too deeply in the slot and the protruding structure on the other side is embedded too shallowly in the slot due to problems such as process errors or process defects.

[0027] In some embodiments, the frame beam also includes a guide transition portion, which is arranged on a side of the frame beam close to the support plate, the guide transition portion protrudes from the first surface toward the accommodating cavity, and a guide surface is arranged on the side of the guide transition portion facing away from the frame beam, and the cross beam is in at least partial contact with the guide surface.

[0028] In the above technical solution, the guide transition part can make it easier to connect the cross beam and the frame beam, and reduce the calibration accuracy time required when connecting the cross beam and the frame beam.

[0029] In some embodiments, the plurality of frame beams include two first side beams and two second side beams, the two first side beams are arranged along a first direction, the two second side beams are arranged along a second direction, and the first direction intersects with the second direction; each second side beam connects the two first side beams, the first side beams and the second side beams form a accommodating space, and a cross beam is arranged in the accommodating space; there are two cross beams, and the two cross beams are arranged at intervals along the second direction and are respectively connected to the two first side beams.

[0030] In the above technical solution, the first side beam and the second side beam jointly form a frame, and the cross beam and the first side beam form a storage space for accommodating the battery cell.

[0031] In some embodiments, the first side beam includes a beam body and a reinforcement portion, the reinforcement portion is arranged to protrude from the first surface, and at least one reinforcement portion is provided between two adjacent grooves on the beam body along the extension direction of the first side beam.

[0032] In the above technical solution, the reinforcing part is used to improve the strength of the beam body. The reinforcing part is provided between two adjacent slots, which can reduce the influence of the slots provided on the beam body on the strength of the beam body itself.

[0033] In a second aspect, an embodiment of the present application provides a battery, including a battery cell; and a plurality of boxes according to any one of the embodiments of the first aspect, the boxes being used to accommodate the battery cells.

[0034] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery according to any embodiment of the second aspect, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0037] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0038] Figure 3 A schematic diagram of the structure of a battery box provided in some embodiments of the present application;

[0039] Figure 4 for Figure 3 An enlarged view of the structure of region Q shown in FIG.

[0040] Figure 5 for Figure 3 A schematic diagram of a battery box from another perspective shown;

[0041] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of AA;

[0042] In the drawings, the drawings are not drawn to scale.

[0043] Marking Description:

[0044] 1000, vehicle; 2000, battery; 2010, housing; 2020, battery cell; 3000, controller; 4000, motor;

[0045] 100, frame beam; 110, first surface; 110a, bottom edge; 120, slot; 121, opening; 121a, bottom; 122, side wall surface; 122a, bottom surface; 122b, top surface; 130, limiter; 140, guide transition portion; 140a, guide surface; 150, first side beam; 151, beam body; 152, reinforcement portion; 160, second side beam;

[0046] 200, cross beam; 210, main body; 220, end; 221, protruding structure; 222, connecting surface;

[0047] 300, support plate;

[0048] X, the cross beam thickness direction, the frame beam extension direction and the second direction; Y, the frame beam thickness direction, the protruding direction and the first direction. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The term "plurality" used in the present application refers to two or more (including two).

[0056] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0057] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc.

[0058] The battery cell further includes a housing, and a housing is formed inside the housing to accommodate the electrode assembly. The housing can protect the electrode assembly from the outside to prevent external foreign matter from affecting the charging or discharging of the electrode assembly.

[0059] The battery cells are stored in the box to form a battery pack, and the power of the battery cells is transmitted to the external electrical appliances through the circuit. The box includes a frame composed of multiple beams. In some cases, the side beams of the box and the internal cross beams are connected together by welding to form a frame for accommodating the battery cells.

[0060] The inventors found that during the use of the battery pack, the battery cells will generate heat, causing the battery cells to expand, which in turn squeezes the side beams and cross beams of the box, reducing the connection strength of the welding area between the side beams and the cross beams, and even worse, causing cracks in the welding area, affecting the product quality rate. The use of bolt locking can also improve the connection strength between the side beams and the cross beams, but the assembly process is difficult and the cost is higher. Therefore, when the battery box is subjected to a large expansion force, how to improve the connection strength between the beams in the box has become a problem that needs to be solved urgently.

[0061] In view of this, an embodiment of the present application provides a technical solution, in which a battery box includes a frame beam and a cross beam. The frame beam includes a first surface and a slot with an opening located on the first surface. The cross beam includes a main body and ends located at both ends of the main body along its length direction, and the ends include a protruding structure and a connecting surface located on the periphery of the protruding structure. The cross beam and the frame beam are engaged with the slot through the protruding structure and are fixedly connected to the first surface through the connecting surface.

[0062] This technical solution provides multiple slots on the frame beams and embeds the cross beams into the slots to improve the strength of the connection between the frame beams and the cross beams, reduce the possibility of damage by the expansion force of the battery cells, and improve the strength of the battery box. The protruding structure at the end of the cross beam is connected to the slot, which can allow the force on the cross beam to be transmitted to the inside of the frame beam through the protruding structure, increase the force-bearing area between the frame beam and the cross beam, and further enhance the strength of the battery box.

[0063] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0064] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0065] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0066] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0067] like Figure 1 As shown, a battery 2000 is disposed inside the vehicle 1000, and the battery 2000 may be disposed at the bottom 121a, the head, or the tail of the vehicle 1000. The battery 2000 may be used to power the vehicle 1000, for example, the battery 2000 may be used as an operating power source for the vehicle 1000.

[0068] The vehicle 1000 may further include a controller 3000 and a motor 4000 , wherein the controller 3000 is used to control the battery 2000 to supply power to the motor 4000 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0069] In some embodiments of the present application, the battery 2000 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0070] Figure 2 An exploded schematic diagram of a battery provided for some embodiments of the present application.

[0071] like Figure 2 As shown, the battery 2000 includes a case 2010 and a battery cell 2020 , and the battery cell 2020 is accommodated in the case 2010 .

[0072] In the battery 2010, there can be one or more battery cells 2020. If there are more than one battery cell 2020, the battery cells 2020 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 2020 are connected in series and in parallel. The battery cells 2020 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 2020 can be accommodated in the box 2010; of course, the battery cells 2020 can be connected in series, in parallel, or in a mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 2010.

[0073] Figure 3 A schematic diagram of the structure of a battery box provided in some embodiments of the present application. Figure 4 for Figure 3 An enlarged view of the structure of area Q is shown in FIG. Figure 5 for Figure 3 A schematic diagram of the battery housing 2010 from another perspective is shown. Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of AA.

[0074] like Figures 2 to 6 As shown, the battery box 2010 of the embodiment of the present application includes a frame beam 100 and a cross beam 200, and the frame beam 100 includes a first surface 110 and a slot 120 with an opening 121 located on the first surface 110. The cross beam 200 includes a main body 210 and end portions 220 located at both ends of the main body 210 along its length direction, and the end portions 220 include a protruding structure 221 and a connecting surface 222 located on the peripheral side of the protruding structure 221. The cross beam 200 and the frame beam 100 are engaged with the slot 120 through the protruding structure 221, and are fixedly connected to the first surface 110 through the connecting surface 222.

[0075] The frame beam 100 encloses a frame of the battery box 2010 for accommodating the battery cell 2020. The side of the frame beam 100 facing the battery cell 2020 is the first surface 110. One or more slots 120 are provided on the frame beam 100, and the opening 121 is provided on the first surface 110. The shape of the opening 121 can be a polygon such as a rectangle, a square, or a rhombus. In some examples of the present embodiment, the slot 120 can be formed by being recessed into the frame beam 100 along a direction perpendicular to the frame beam 100 and the first surface 110. In other examples of the present embodiment, the slot 120 can be formed by being recessed into the frame beam 100 along a direction at a certain angle between the frame beam 100 and the first surface 110.

[0076] The crossbeam 200 can be clamped in the slot 120 of the frame beam 100 through the end 220 to define the accommodation space of the battery cell 2020. The protruding structure 221 protrudes from the end 220 of the crossbeam 200, and the protruding direction of the protruding structure 221 matches the concave direction of the slot 120, so that the protruding structure 221 is plugged into the slot 120. In some examples of this embodiment, the protruding shape of the protruding structure 221 is similar to the concave shape of the slot 120, so that after the protruding structure 221 is plugged into the slot 120, there is a sufficient contact area between the protruding structure 221 and the slot 120, so as to avoid the protruding structure 221 moving in the slot 120 and affecting the subsequent welding between the crossbeam 200 and the frame beam 100. In other examples of this embodiment, the protruding shape of the protruding structure 221 can be a cube, a cuboid, etc., to reduce the process difficulty of the crossbeam 200.

[0077] It is understandable that after the protruding structure 221 is engaged with the slot 120, the protruding structure 221 generates a pre-tightening force to securely connect the cross beam 200 to the frame beam 100. The connecting surface 222 on the cross beam 200 and the first surface 110 on the frame beam 100 can be welded, bonded, or otherwise connected to achieve secure connection between the cross beam 200 and the frame beam 100.

[0078] In this embodiment, one or more slots 120 are provided on the frame beam 100, and the cross beam 200 is embedded in the slots 120, so as to improve the strength of the connection between the frame beam 100 and the cross beam 200, reduce the possibility of damage by the expansion force of the battery cell 2020, and thus improve the strength of the battery box 2010. The protruding structure 221 of the end 220 of the cross beam 200 is clamped in the slot 120, so that the force on the cross beam 200 can be transmitted to the inside of the frame beam 100 through the protruding structure 221, increase the force bearing area between the frame beam 100 and the cross beam 200, and further enhance the strength of the battery box 2010.

[0079] In some embodiments, a minimum distance H between an edge of the bottom 121 a of the opening 121 and a bottom edge 110 a of the first surface 110 in the thickness direction of the box body 2010 satisfies the relationship 10 mm ≤ H ≤ 100 mm.

[0080] In the thickness direction of the box body 2010 , the first surface 110 has a bottom edge 110 a and a top edge opposite to each other, and the opening 121 for forming the card slot 120 has a bottom 121 a and a top.

[0081] In this embodiment, the minimum distance between the edge of the bottom 121a of the opening 121 and the bottom edge 110a of the first surface 110 is too small or too large, and the closer the opening 121 is to the edge of the frame beam 100, the lower the strength of the frame beam 100 itself. The minimum distance between the edge of the bottom 121a of the opening 121 and the bottom edge 110a of the first surface 110 is limited to 10mm≤H≤100mm to ensure the strength of the frame beam 100 itself.

[0082] In some embodiments, the slot 120 includes a plurality of sidewall surfaces 122 , and the protruding structure 221 is disposed in close contact with a portion of the sidewall surfaces 122 among the plurality of sidewall surfaces 122 .

[0083] In this embodiment, the cross beam 200 is affected by its own gravity, and the surface of the protruding structure 221 will be in close contact with a portion of the side wall surface 122. Exemplarily, the side wall surface 122 of the slot 120 can be divided into a relative bottom surface 122a and a top surface 122b, as well as a plurality of relative side surfaces in the thickness direction of the box body 2010. The surface of the protruding structure 221 is in close contact with the bottom surface 122a of the slot 120. In some examples of this embodiment, the surface of the protruding structure 221 can also be in close contact with one or more side surfaces of the slot 120. And the protruding structure 221 is in close contact with a portion of the side wall surface 122, so as to realize the clamping connection between the protruding structure 221 and the slot 120, which is convenient for the subsequent fixed connection between the cross beam 200 and the frame beam 100.

[0084] In some embodiments, the slot 120 includes a plurality of sidewall surfaces 122 , and a gap is disposed between the protruding structure 221 and another portion of the sidewall surfaces 122 of the plurality of sidewall surfaces 122 .

[0085] In some examples of this embodiment, a gap is provided between the surface of the protruding structure 221 and the top surface 122 b of the slot 120 . In other examples of this embodiment, the surface of the protruding structure 221 is in close contact with one or more side surfaces of the slot 120 .

[0086] In this embodiment, a gap exists between a portion of the side wall surface 122 of the slot 120 and the protruding structure 221 to ensure that the protruding structure 221 can be more easily embedded in the slot 120 .

[0087] In some embodiments, the minimum thickness H1 of the protruding structure 221 along the thickness direction of the beam 200 satisfies 5 mm ≤ H1 ≤ 100 mm.

[0088] In some examples of this embodiment, in order to ensure that the protruding structure 221 can better transmit the extrusion force exerted on the cross beam 200 to the frame beam 100 through the protruding structure 221, the protruding structure 221 and the main body 210 are integrally formed.

[0089] In this embodiment, if the thickness of the protruding structure 221 is too small, the force bearing performance between the protruding structure 221 and the frame beam 100 will be reduced. If the thickness of the protruding structure 221 is too large, the connection strength between the protruding structure 221 and the cross beam 200 will be reduced. The thickness of the protruding structure 221 is limited to 5mm≤H1≤100mm to ensure the force bearing performance between the protruding structure 221 and the frame beam 100 and the connection strength between the protruding structure 221 and the cross beam 200.

[0090] In some embodiments, the minimum distance between two opposite side wall surfaces 122 of the slot 120 along the extension direction X of the frame beam 100 is H2, and H1 and H2 satisfy the relationship 0mm≤H2-H1≤1mm.

[0091] In this embodiment, the minimum distance between the two side wall surfaces 122 of the slot 120 that are opposite to each other along the extension direction X of the frame beam 100 and the two surfaces in the thickness direction X of the protruding structure 221 can be in close contact or have a gap, so as to ensure that the protruding structure 221 can be easily connected to the slot 120. If the gap is too large, the welding strength between the cross beam 200 and the frame beam 100 will be reduced. The relationship between the minimum distance between the two side wall surfaces 122 of the slot 120 that are opposite to each other along the extension direction X of the frame beam 100 and the two surfaces in the thickness direction X of the protruding structure 221 is limited to 0mm≤H2-H1≤1mm, so as to facilitate the assembly of the protruding structure 221 and ensure the welding strength between the cross beam 200 and the frame beam 100.

[0092] In some embodiments, a depth H3 of the slot 120 along the thickness direction Y of the frame beam 100 satisfies 5 mm ≤ H3 ≤ 50 mm.

[0093] In this embodiment, the deeper the depth of the slot 120, the lower the strength of the frame beam 100 itself, and the shallower the depth of the slot 120, the worse the force effect that the protruding structure 221 can transmit to the slot 120. In this embodiment, the depth of the slot 120 is limited to 5mm≤H3≤50mm, and the depth of the slot 120 is increased as much as possible under the premise of ensuring the strength of the frame beam 100 itself.

[0094] In some embodiments, the distance between the end surface of the protruding structure 221 along the protruding direction Y and the connecting surface 222 is H4, and H3 and H4 satisfy the relationship, 0mm≤H4-H3≤10mm.

[0095] In order to reduce the process of the protruding structure 221 in the cross beam 200, in some examples of the present embodiment, the protruding shape of the protruding structure 221 is a rectangular parallelepiped. The distance between the end face of the protruding structure 221 and the connecting surface 222 is the protruding length of the protruding structure 221. Similarly, in order to reduce the process of the slot 120, the concave shape of the slot 120 can be a rectangular parallelepiped groove. The depth of the slot 120 along the thickness direction Y of the frame beam 100 is the concave depth of the slot 120.

[0096] In this embodiment, the closer the distance between the end face of the protruding structure 221 along the protruding direction Y and the connecting face 222 is to the depth of the card slot 120 along the thickness direction Y of the frame beam 100, the higher the process difficulty. The larger the distance between the end face of the protruding structure 221 along the protruding direction Y and the connecting face 222 is to the depth of the card slot 120 along the thickness direction Y of the frame beam 100, the worse the force bearing performance between the protruding structure 221 and the frame beam 100. The relationship between the protruding distance of the protruding structure 221 and the depth of the card slot 120 is limited to 0mm≤H4-H3≤10mm to balance the process and force bearing performance.

[0097] In some embodiments, the connection surface 222 is welded to the first surface 110 .

[0098] In this embodiment, the frame beam 100 and the cross beam 200 are fixedly connected by welding, so as to improve the connection strength between the frame beam 100 and the cross beam 200.

[0099] In some embodiments, the box 2010 further includes a support plate 300, which is connected to the frame beam 100 and encloses the frame beam 100 to form a receiving cavity. The receiving cavity is used to receive the battery cells. The battery cells can be fixedly connected to the support plate 300 by bonding, bolts, etc.

[0100] In some embodiments, the frame beam 100 includes a limiting portion 130 , which is disposed on a side of the opening 121 away from the support plate 300 and / or on a side close to the support plate 300 , and the connecting surface 222 abuts against the limiting portion 130 .

[0101] The support plate 300 covers the frame formed by the frame beam 100 to support the battery cells 2020 .

[0102] In this embodiment, the limiting portion 130 limits the depth of the protruding structure 221 embedded in the slot 120, thereby avoiding the phenomenon that the protruding structure 221 on one side of the beam 200 is embedded too deeply in the slot 120 and the protruding structure 221 on the other side is embedded too shallowly in the slot 120 due to problems such as process errors or process defects.

[0103] In some embodiments, the frame beam 100 further includes a guide transition portion 140, which is disposed on a side of the frame beam 100 close to the support plate 300. The guide transition portion 140 is protruded from the first surface 110 toward the accommodating cavity, and a guide surface 140a is disposed on the side of the guide transition portion 140 facing away from the frame beam 100, and the cross beam 200 abuts against at least a portion of the guide surface 140a.

[0104] The guide surface 140a of the guide transition portion 140 may be in the form of a smooth guide curved surface or a guide angle. The closer the guide surface 140a is to one side of the support plate 300, the farther the guide surface 140a is from the frame beam 100, and the farther the guide surface 140a is from one side of the support plate 300, the closer the guide surface 140a is to the frame beam 100. During the installation of the cross beam 200 and the frame beam 100, the cross beam 200 may be embedded in the slot 120 of the frame beam 100 along the guidance of the guide surface 140a.

[0105] In this embodiment, the guide transition portion 140 can make it easier to connect the cross beam 200 to the frame beam 100, and reduce the calibration accuracy time required when the cross beam 200 is connected to the frame beam 100. At the same time, the transition guide portion can also enhance the strength of the frame beam 100 itself, compensating for the reduced anti-extrusion performance of the frame beam 100 after the slot 120 is provided.

[0106] like Figures 3 to 5 As shown, in some embodiments, the plurality of frame beams 100 include two first side beams 150 and two second side beams 160, the two first side beams 150 are arranged along the first direction Y, the two second side beams 160 are arranged along the second direction X, and the first direction Y intersects the second direction X; each second side beam 160 connects the two first side beams 150, the first side beams 150 and the second side beams 160 form a receiving space, and the cross beam is arranged in the receiving space. There are two cross beams 200, and the two cross beams 200 are arranged at intervals along the second direction X and are respectively connected to the two first side beams 150.

[0107] The first side beam 150 and the second side beam 160 are fixedly connected to each other to form the frame of the battery box 2010, and the connection methods include welding, gluing, etc. The accommodation space enclosed by the first side beam 150 and the cross beam 200 is used to place the battery cell 2020. The expansion force of the battery cell 2020 due to operation or damage will squeeze the cross beam 200, and the cross beam 200 will transfer the expansion force to the first side beam 150 through the protruding structure 221 and the card slot 120, so that the welding area between the first side beam 150 and the cross beam 200 is not affected by the expansion force. It should be noted that the expansion force that the first side beam 150 can withstand is much greater than the expansion force that the welding area between the cross beam 200 and the first side beam 150 can withstand, thereby improving the reliability and safety of the battery box 2010.

[0108] In some embodiments, the first side beam 150 includes a beam body 151 and a reinforcing portion 152 , the reinforcing portion 152 is arranged to protrude from the first surface 110 , and at least one reinforcing portion 152 is provided between two adjacent slots 120 on the X-beam body 151 along the extension direction of the first side beam 150 .

[0109] There is a gap between the battery cells 2020 in the box body 2010 and the first side beam 150 of the box body 2010 , and the reinforcement portion 152 is disposed in the gap.

[0110] In this embodiment, the reinforcing portion 152 is used to improve the strength of the beam body 151 . The reinforcing portion 152 is provided between two adjacent slots 120 , which can reduce the influence of the slots 120 on the strength of the beam body 151 .

[0111] In some embodiments, the present application further provides a battery, comprising a battery cell 2020 and a plurality of battery boxes 2010 according to any of the above embodiments. The box 2010 is used to accommodate the battery cell 2020 .

[0112] In some embodiments, the present application also provides an electrical device, including a battery according to any of the above embodiments, and the battery is used to provide electrical energy.

[0113] In some embodiments, reference Figures 3 to 6The present application provides a battery box 2010. The battery box 2010 includes a frame beam 100 and a cross beam 200. The frame beam 100 includes a first surface 110 and a slot 120 with an opening 121 located on the first surface 110. The cross beam 200 includes a main body 210 and ends 220 located at both ends of the main body 210 along its length direction. The end 220 includes a protruding structure 221 and a connecting surface 222 located on the periphery of the protruding structure 221. The cross beam 200 and the frame beam 100 are engaged with the slot 120 through the protruding structure 221, and are fixedly connected to the first surface 110 through the connecting surface 222. The frame beam 100 also includes a guide transition portion 140, which is arranged on one side of the frame beam 100 close to the support plate 300. The frame beam 100 encloses a receiving space, the cross beam 200 is arranged in the receiving space, and the ends of the cross beam 200 are respectively connected to the two frame beams 100.

[0114] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0115] 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 it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery box, characterized in that: include: A frame beam, the frame beam comprising a first surface and a slot with an opening located on the first surface; the frame beam comprising two first side beams and two second side beams, the two first side beams are arranged along a first direction, the two second side beams are arranged along a second direction, and the first direction intersects with the second direction; The cross beam includes a main body and ends at both ends of the main body along its length direction, the ends include a protruding structure and a connecting surface located around the protruding structure, the cross beam and the frame beam are engaged with the card slot through the protruding structure, and are fixedly connected to the first surface through the connecting surface; Each of the second side beams is connected to the two first side beams, the first side beams and the second side beams form a receiving space, and the cross beam is arranged in the receiving space; The first side beam includes a beam body and a reinforcement portion, wherein the reinforcement portion is arranged to protrude from the first surface, at least one reinforcement portion is arranged between two adjacent slots on the beam body along the extension direction of the first side beam, and the box body is used to accommodate a battery cell, a gap is arranged between the battery cell and the first side beam, and the reinforcement portion is arranged in the gap.

2. The box according to claim 1, characterized in that: A minimum distance H between the bottom edge of the opening in the thickness direction of the box body and the bottom edge of the first surface satisfies the relationship 10 mm ≤ H ≤ 100 mm.

3. The box according to claim 1, characterized in that: The card slot includes a plurality of side wall surfaces, and the protruding structure is disposed in close contact with a portion of the side wall surfaces among the plurality of side wall surfaces.

4. The box according to claim 3, characterized in that: The protruding structure is spaced apart from the sidewall surface of another portion of the plurality of sidewall surfaces.

5. The box according to claim 3, characterized in that: The minimum thickness H1 of the protruding structure along the thickness direction of the beam satisfies 5mm≤H1≤100mm.

6. The box according to claim 5, characterized in that: The minimum distance between the two side wall surfaces of the slot that are opposite to each other along the extension direction of the frame beam is H2, and H1 and H2 satisfy the relationship 0mm≤H2-H1≤1mm.

7. The box according to claim 1, characterized in that: The depth H3 of the slot along the thickness direction of the frame beam satisfies 5mm≤H3≤50mm.

8. The box according to claim 7, characterized in that: The distance between the end surface of the protruding structure along the protruding direction and the connecting surface is H4, and H3 and H4 satisfy the relationship of 0mm≤H4-H3≤10mm.

9. The box according to claim 1, characterized in that: The connecting surface is welded to the first surface.

10. The box according to claim 1, characterized in that: The box body also includes a support plate, which is connected to the frame beam and encloses the frame beam to form a receiving cavity.

11. The box according to claim 10, characterized in that: The frame beam comprises a limiting portion, the limiting portion is arranged on a side of the opening away from the support plate and / or a side close to the support plate, and the connecting surface abuts against the limiting portion.

12. The box according to claim 10, characterized in that: The frame beam also includes a guide transition portion, which is arranged on a side of the frame beam close to the support plate. The guide transition portion protrudes from the first surface toward the accommodating cavity. The side of the guide transition portion facing away from the frame beam includes a guide surface, and the cross beam abuts against at least part of the guide surface.

13. The box according to claim 1, characterized in that: There are two cross beams, which are spaced apart along the second direction and respectively connected to the two first side beams.

14. A battery, characterized in that: include: Battery cells; as well as The box according to any one of claims 1 to 13, wherein the box is used to accommodate the battery monomer.

15. An electrical device, characterized in that: Comprising a battery as claimed in claim 14, the battery is used to provide electrical energy.

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