Battery box, battery device and power utilization device

Abstract

The battery box comprises a box body, a cover body, a first connecting piece and a heat preservation layer, a first opening is formed in the end, in the axial direction of the box body, of the box body, the box body comprises a frame, and the frame extends in the circumferential direction of the box body; the cover body is connected with the frame to block the first opening to form a containing space for containing the battery monomers, the frame is provided with a containing groove communicated with the containing space, the heat preservation layer is at least partially contained in the containing groove, and the first connecting piece penetrates through the frame and the cover body in the axial direction of the box body and is inserted into the containing groove. According to the scheme, the heat preservation effect of the battery box can be improved under the condition that the overall external size of the battery box is not increased.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery box, a battery device, and an electrical device. Background Art

[0002] Generally speaking, a battery device includes a battery box and battery cells accommodated in the battery box. The battery box needs to have a certain heat preservation performance so that the battery cells can work within a suitable temperature range.

[0003] Currently, the heat preservation function of the battery box mainly depends on attaching heat preservation foam outside the battery box. However, limited by the overall external dimensions of the battery device, the heat preservation foam cannot be made too thick, resulting in an unsatisfactory heat preservation effect of the battery box. Therefore, the heat preservation performance of the current battery box still needs to be improved. Summary of the Utility Model

[0004] The purpose of this application is to provide a battery box, a battery device, and an electrical device to improve the heat preservation performance of the battery box.

[0005] To achieve the above object, the first technical solution provided by this application is: A battery box includes a box body, a cover body, a first connecting member, and a heat preservation layer. The box body is provided with a first opening at one end in the axial direction of the box body. The box body includes a frame. The frame extends along the circumferential direction of the box body. The cover body is connected to the frame to block the first opening to form an accommodation space for accommodating battery cells. The frame has an accommodation groove communicating with the accommodation space. The heat preservation layer is at least partially accommodated in the accommodation groove. The first connecting member is axially inserted through the frame and the cover body along the axial direction of the box body and is inserted into the accommodation groove.

[0006] The beneficial effect of the battery box provided by this application is: In the battery box provided by the embodiment of this application, the cover body is covered on one side of the frame in the axial direction of the box body through the first connecting member to close the first opening of the box body, enabling the box body and the cover body to be connected in a closed form to better accommodate and protect the battery cells. And the first connecting member is axially inserted into the accommodation groove. The dimension of the accommodation groove in the radial direction of the box body is at least the dimension of the first connecting member in the radial direction of the box body. Therefore, the heat preservation layer in the accommodation groove can also have a relatively large thickness. And since the heat preservation layer is located inside the frame, the heat preservation effect of the battery box can be improved without increasing the overall external dimensions of the battery box.

[0007] In some embodiments, the frame includes a plurality of frame bodies arranged along the circumferential direction of the box body. At least one frame body includes a side wall plate, a first connecting plate, and a second connecting plate. The side wall plate extends along the circumferential direction of the box body. The first connecting plate and the second connecting plate are connected to both sides of the side wall plate in the axial direction of the box body. The first connecting plate and the second connecting plate both at least partially extend toward the accommodation space along the radial direction of the box body to jointly form the accommodation groove with the side wall plate.

[0008] In the embodiments of the present application, at least one frame body includes a side wall plate, a first connecting plate, and a second connecting plate. Both the first connecting plate and the second connecting plate at least partially extend towards the accommodating space along the radial direction of the box body, so that the overall frame body forms an accommodating groove approximately in the shape of a "C". The frame body with the accommodating groove has a simple structure and a relatively simple forming process. Moreover, both the first connecting plate and the second connecting plate at least partially extend towards the accommodating space along the radial direction of the box body. The first connecting plate can be conveniently connected and fixed to the cover body, and the second connecting plate can be conveniently connected and fixed to the part of the box body other than the frame.

[0009] In some embodiments, the heat insulation layer is integrally formed in the accommodating groove.

[0010] In the embodiments of the present application, the heat insulation layer is integrally formed in the accommodating groove, which can make the heat insulation layer and the frame body form an inseparable integral structure. Through the forming of the heat insulation layer, the connection and fixation between the heat insulation layer and the frame body are realized, and the connection and assembly process of the heat insulation layer and the frame body can be simplified.

[0011] In some embodiments, one end of the first connecting plate facing the accommodating space and one end of the second connecting plate facing the accommodating space are spaced apart in the axial direction of the box body to form a window. The accommodating groove communicates with the accommodating space through the window, and the size of the window in the axial direction of the box body is greater than or equal to 50 mm.

[0012] In the embodiments of the present application, the accommodating groove communicates with the accommodating space through the window. The window can be used as an injection port for the injection raw material when the heat insulation layer is injection-molded. In the embodiments of the present application, the size of the window in the axial direction of the box body is set to be greater than or equal to 50 mm, which can facilitate the injection of the injection raw material into the accommodating groove from the window.

[0013] In some embodiments, the heat insulation layer protrudes towards the accommodating space in the radial direction of the box body beyond the window; wherein, the heat insulation layer is an insulating part, or at least the surface of the heat insulation layer facing the accommodating space in the radial direction of the box body is coated with an insulating layer.

[0014] In the embodiments of the present application, since the heat insulation layer is an insulating part, or at least the surface of the heat insulation layer facing the accommodating space in the radial direction Y of the box body is coated with an insulating layer, the heat insulation layer has insulating performance. By the heat insulation layer protruding towards the accommodating space in the radial direction of the box body beyond the window, the heat insulation layer can also reduce the risk of direct electrical contact between the side part of the battery cell and the side wall in the radial direction of the frame in the box body. That is, the heat insulation layer can play the roles of heat insulation and insulation protection at the same time and can replace the insulation protection components of the battery box.

[0015] In some embodiments, the first connecting member includes a first connecting sleeve and a first fastener. The first connecting sleeve is fixed to the first connecting plate and inserted into the accommodating groove, and the first fastener passes through the cover body and is fastened into the first connecting sleeve.

[0016] In the embodiments of the present application, the first connecting member is provided to include a first connecting sleeve and a first fastener. The first connecting sleeve can be pre-passed through and fixed to the first connecting plate of the frame body. The first connecting sleeve can cooperate with the first fastener to facilitate the connection between the frame body and the cover body. Moreover, the first fastener is installed through the first connecting sleeve, which can reduce the interference between the first fastener and the thermal insulation layer during installation.

[0017] Especially when the thermal insulation layer is integrally formed in the receiving groove, since the forming of the thermal insulation layer needs to be injection-molded through an injection mold, the first connecting sleeve together with the frame body are both pre-buried into the injection mold. The outer surface of the first connecting sleeve can be used as a part of the boundary of the cavity of the injection mold to facilitate the formation of the thermal insulation layer in the space outside the first connecting sleeve within the receiving space. After the thermal insulation layer is injection-molded, there is no thermal insulation layer inside the first connecting sleeve. Therefore, the interference with the connection and fastening between the first connecting sleeve and the first fastener can be reduced.

[0018] In some embodiments, the box body further includes a cross beam. The cross beam is located in the receiving space, and the end of the cross beam is welded to the frame; the thermal insulation layer includes a plurality of spaced thermal insulation segments arranged along the circumference of the box body. The end of the cross beam is located between adjacent thermal insulation segments, and the ends of the thermal insulation segments in the circumferential direction of the box body are spaced from the ends of the connecting frame of the cross beam to form an operating space for avoiding the end of the cross beam.

[0019] In the embodiments of the present application, since the thermal insulation layer is integrally formed in the receiving groove of the frame, when welding the cross beam, the thermal insulation layer already exists in the receiving groove of the frame, and there will be a problem that the thermal insulation layer interferes with the welding of the cross beam to the frame. In this embodiment, the thermal insulation layer is provided as a plurality of spaced thermal insulation segments arranged along the circumference of the box body. Since there is a certain distance between adjacent thermal insulation segments along the length direction of the frame, the end of the cross beam can be welded between adjacent thermal insulation segments on the frame body. Moreover, in the embodiments of the present application, a certain distance is also provided between the thermal insulation segment and the end of the cross beam. This distance can enable the thermal insulation segment to avoid the welding operation between the end of the cross beam and the frame body, and reduce the interference of the thermal insulation segment during the welding of the end of the cross beam.

[0020] In some embodiments, the size of the operating space in the circumferential direction of the box body is 20 mm to 50 mm.

[0021] In the embodiments of the present application, limiting the size of the operating space in the circumferential direction of the box body within the range of 20 mm to 50 mm can obtain a better thermal insulation effect while reducing the interference of the thermal insulation layer with the welding operation of the end of the cross beam.

[0022] In some embodiments, the first connecting plate includes a connecting portion and a folded edge. The connecting portion is connected between the side wall plate and the folded edge. The folded edge is bent towards the second connecting plate relative to the connecting portion. The end portion of the cross beam is partially welded to the folded edge.

[0023] In the embodiment of the present application, a folded edge is provided on the first connecting plate, which can facilitate welding between the end of the beam and the frame and increase the welding area between the end of the beam and the first connecting plate.

[0024] In some embodiments, the dimension of the folded edge in the axial direction of the box body is greater than or equal to 10 mm.

[0025] In the embodiment of the present application, the dimension of the folded edge in the axial direction of the box body is set to be greater than or equal to 10 mm, which can meet the required welding strength between the end of the beam and the folded edge.

[0026] In some embodiments, the box body also includes a bottom plate and a second connecting member, the frame has a second opening opposite to the first opening in the axial direction of the box body, the bottom plate cover is arranged on the frame to block the second opening, the bottom plate includes a heat exchange plate and a bottom guard plate both connected to the second connecting plate, the bottom guard plate is located on the side of the heat exchange plate in the axial direction of the box body away from the accommodating space, the second connecting member is penetrated through the bottom guard plate and the second connecting plate along the axial direction of the box body and inserted into the accommodating groove, and the side wall of the heat exchange plate in the radial direction of the box body is located on the side of the second connecting member facing the accommodating space.

[0027] In the embodiment of the present application, the bottom plate is connected to the second connecting plate through the second connecting piece, and the heat exchange plate and the bottom guard plate together constitute the bottom plate. The heat exchange plate can perform heat exchange with the battery cells contained in the box body to reduce the heat generated by the battery cells during the use of the battery device. The bottom guard plate can protect the heat exchange plate, reduce the risk of damage to the heat exchange plate, and improve the protection ability of the bottom of the battery box. In addition, the second connecting piece is inserted through the bottom guard plate and the second connecting plate to fix the bottom guard plate to the second connecting plate. The side wall of the heat exchange plate in the radial direction of the box body is located on the side of the second connecting piece facing the accommodation space, that is, the side wall of the heat exchange plate in the radial direction of the box body is closer to the accommodation space than the side wall of the bottom guard plate in the radial direction of the box body. The second connecting piece is not inserted through the heat exchange plate to reduce the influence and interference of the second connecting piece on the heat exchange function of the heat exchange plate.

[0028] In some embodiments, along the radial direction of the box body, one end of the second connecting plate facing the accommodating space is closer to the accommodating space than the end of the first connecting plate facing the accommodating space; the insulation layer protrudes out of the accommodating groove in the radial direction of the box body, and the insulation layer at least covers the side wall of the second connecting plate in the radial direction of the box body; wherein the insulation layer is an insulating part, or the insulation layer is coated with an insulating layer on at least the surface of the insulation layer facing the accommodating space in the radial direction of the box body.

[0029] In the embodiments of the present application, one end of the second connecting plate facing the accommodating space is closer to the accommodating space than one end of the first connecting plate facing the accommodating space, which can make the dimension of the second connecting plate in the radial direction of the box body larger than that of the first connecting plate in the radial direction of the box body, meeting the requirements of passing the first connecting member through the first connecting plate, passing the second connecting member through the second connecting plate and connecting the heat exchange plate inside the second connecting member on the second connecting plate.

[0030] Moreover, in the embodiments of the present application, the heat insulation layer also has insulation performance. Setting the heat insulation layer to protrude in the radial direction of the box body from the accommodating groove can reduce the risk of electrical contact between the frame body and the side part of the battery cell in the accommodating space.

[0031] Also, since one end of the second connecting plate facing the accommodating space is closer to the accommodating space than one end of the first connecting plate facing the accommodating space, one end of the second connecting plate facing the accommodating space is more likely to have electrical contact with the side part of the battery cell in the accommodating space. In the embodiments of the present application, the heat insulation layer at least covers the side wall of the second connecting plate in the radial direction of the box body, which can reduce the risk of electrical contact between one end of the second connecting plate facing the accommodating space and the side part of the battery cell in the accommodating space.

[0032] To achieve the above object, the second technical solution provided by the present application is: a battery device, including a battery cell and the battery box according to any of the above solutions; wherein, the battery cell is accommodated in the accommodating space.

[0033] The beneficial effects of the battery device provided by the present application are the same as those of the battery box, and will not be elaborated here.

[0034] In some embodiments, along the radial direction of the box body, the battery cell and the heat insulation layer are arranged at intervals, and the distance between the battery cell and the heat insulation layer is 5 mm to 40 mm.

[0035] In the embodiments of the present application, restricting the distance between the battery cell and the heat insulation layer in the radial direction of the box body within the range of 5 mm to 40 mm is convenient for assembling multiple battery cells into the battery box, and can also improve the space utilization rate inside the battery box, thereby increasing the battery energy density.

[0036] To achieve the above object, the third technical solution provided by the present application is: an electrical device, including the above battery device, and the battery device is used to provide electrical energy for the electrical device.

[0037] The beneficial effects of the electrical device provided by the present application are the same as those of the battery box, and will not be elaborated here. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, where:

[0039] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments provided by the present application;

[0040] Figure 2 is a three-dimensional structural diagram of a battery box according to one or more embodiments provided by the present application;

[0041] Figure 3 is Figure 2 a partial three-dimensional structural diagram of the frame of the battery box in;

[0042] Figure 4 is Figure 3 the front view of;

[0043] Figure 5 is Figure 4 the sectional view A-A in;

[0044] Figure 6 is Figure 5 the structural diagram after adding the cover;

[0045] Figure 7 is a schematic diagram of the injection molding process of the thermal insulation layer in the battery box according to one or more embodiments provided by the present application;

[0046] Figure 8 is Figure 7 the sectional view of the injection mold in the closed state in;

[0047] Figure 9 is Figure 2 the front view of the frame and cross beam in the battery box of;

[0048] Figure 10 is Figure 9 the enlarged view at B in;

[0049] Figure 11 is an exploded view of a battery device according to one or more embodiments provided by the present application;

[0050] Figure 12 is a top view of a battery device according to one or more embodiments provided by the present application;

[0051] Figure 13 is Figure 12 the sectional view C-C in;

[0052] Figure 14 Yes Figure 13 The enlarged view of the D position in the figure.

[0053] Description of the reference numerals in the drawings:

[0054] Vehicle 1000; Controller 200; Motor 300; Battery device 100; Battery cell 10; Battery box 20; Accommodating space 201; Accommodating sub - space 2010; Box body 21; First opening 2101; Frame 211; Accommodating groove 2110; Window 2110A; Frame body 211A; Side wall plate 2111; First connecting plate 2112; Connecting portion 21121; Flange 21122; Second connecting plate 2113; Bottom plate 212; Heat - exchange plate 2121; Bottom guard plate 2122; Second connecting member 213; Second connecting sleeve 2131; Second fastener 2132; Mounting arm 214; Cover body 22; First connecting member 23; First connecting sleeve 231; First fastener 232; Thermal insulation layer 24; Thermal insulation section 240; Operation space 241; Cross beam 25; Injection mold 1; Injection mold body 101; First mold 102; Isolation portion 1020; Second mold 103; Fixed cavity 1030; Injection molding raw material 2; Axial direction X; Radial direction Y. Detailed implementation manners

[0055] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion.

[0057] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary - secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0058] Reference to "embodiments" in this specification means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor are they independent or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0059] In the description of the embodiments of the present application, the term "and / or" is merely 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 simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0060] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0061] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0063] In the related art, a battery device generally includes a battery box and battery cells accommodated in the battery box. The battery box needs to have a certain heat insulation performance so that the battery cells in the battery box can work within a suitable temperature range.

[0064] Currently, the heat preservation function of the battery box mainly depends on attaching heat preservation foam outside the battery box. However, limited by the installation space of the battery device, the overall external dimensions of the battery device are limited, and the heat preservation foam cannot be made too thick, resulting in an unsatisfactory heat preservation effect of the battery box. Therefore, the heat preservation performance of the current battery box still needs to be improved.

[0065] In view of this, in order to improve the heat preservation effect of the battery box, an embodiment of the present application provides a battery box, which includes a box body, a cover body, a first connecting member, and a heat preservation layer. The box body is provided with a first opening at one end in the axial direction of the box body. The box body includes a frame, and the frame extends along the circumferential direction of the box body. The cover body is connected to the frame to block the first opening to form a receiving space for receiving battery cells. The frame has a receiving groove communicating with the receiving space, and at least a part of the heat preservation layer is received in the receiving groove. The first connecting member axially penetrates the frame and the cover body along the axial direction of the box body and is inserted into the receiving groove.

[0066] In the battery box provided by the embodiment of the present application, the cover body is connected to one side of the frame in the axial direction of the box body through the first connecting member to close the first opening of the box body, so that the box body and the cover body can be connected into a closed form to better accommodate and protect the battery cells. And the first connecting member is axially inserted into the receiving groove. The size of the receiving groove in the radial direction of the box body is at least the size of the first connecting member in the radial direction of the box body. Therefore, the heat preservation layer in the receiving groove can also have a relatively large thickness. And since the heat preservation layer is located inside the frame, the heat preservation effect of the battery box can be improved without increasing the overall external dimensions of the battery box.

[0067] The battery device involved in the embodiment of the present application can be used in an electric device using the battery device as a power source. The electric device involved in the embodiment of the present application can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, a vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc. Divided by the power source, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Divided by the driving mode, the vehicle can be a front-wheel drive vehicle, a rear-wheel drive vehicle or a four-wheel drive vehicle.

[0068] Among them, the electric device includes a device main body and the battery device involved in the context. The device main body is the main frame structure of the electric device. For example, when the electric device is a vehicle, the device main body is the vehicle body. When the electric device is a ship, the device main body is the hull.

[0069] In some other embodiments, the battery device involved in the embodiments of the present application can also be used in an energy storage system that uses the battery device as an energy storage element. Among them, the energy storage system can include an energy storage container, an energy storage electrical cabinet, etc.

[0070] For ease of description, the embodiments of the present application will be described by taking the electrical device as a vehicle as an example.

[0071] Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a vehicle according to one or more embodiments provided by the present application. A controller 200, a motor 300, and a battery device 100 can be arranged inside the vehicle 1000. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and applied to the circuit system of the vehicle 1000, such as for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000 but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0072] The battery device 100 involved in the embodiments of the present application refers to a single physical module that includes a plurality of battery cells to provide higher voltage and capacity.

[0073] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use. Each battery cell can also be a primary battery.

[0074] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0075] The battery box provided by the embodiments of the present application can improve the heat preservation effect of the battery box without increasing the overall external dimensions of the battery box. The following will specifically elaborate on the structure of the battery box provided by the present application and the principle of how to improve the heat preservation effect with reference to the accompanying drawings.

[0076] The embodiments of the present application provide a battery box. Please refer to Figure 2 , Figure 2Schematic three-dimensional structure diagram of a battery box provided according to one or more embodiments of the present application. The battery box 20 includes a box body 21, a cover body, a first connecting member 23, and a heat insulation layer 24 ( Figure 2 The structure of the cover body is not shown in the figure). One end of the box body 21 in the axial direction X of the box body 21 is provided with a first opening 2101. The box body 21 includes a frame 211, and the frame 211 extends along the circumferential direction of the box body 21. Combining with Figures 3 to 6 , Figure 3 is Figure 2 Partial three-dimensional structure diagram of the frame 211 in the battery box shown in the figure, Figure 4 is Figure 3 Front view of the figure, Figure 5 is Figure 4 Cross-sectional view taken along line A-A in the figure, Figure 6 is Figure 5 Schematic structure diagram after adding the cover body 22. The cover body 22 is connected to the frame 211 to seal the first opening 2101 to form an accommodation space 201 for accommodating battery cells. The frame 211 has an accommodation groove 2110 communicating with the accommodation space 201. The heat insulation layer 24 is at least partially accommodated in the accommodation groove 2110. The first connecting member 23 is inserted through the frame 211 and the cover body 22 along the axial direction X of the box body 21 and is placed in the accommodation groove 2110.

[0077] Among them, the box body 21 is used to accommodate battery cells. The box body 21 is provided with a first opening 2101, that is, the box body 21 is a hollow structure with one side open. The battery cells can be installed into the box body 21 through the first opening 2101, which facilitates the installation of the battery cells.

[0078] The frame 211 of the box body 21 is a part of the box body 21 along the axial direction X of the box body 21. The frame 211 mainly plays a supporting role in the axial direction X of the box body 21. The frame 211 can be an annular frame structure, such as an annular frame 211 with an approximate rectangular shape. An accommodation space 201 for accommodating battery cells is formed at the center of the annular frame 211. The rest of the box body 21 can be integrally formed with the frame 211, that is, the box body 21 is an integrally formed hollow structure with one side having an opening; the rest of the box body 21 can also be separately arranged from the frame 211. For example, the rest of the box body 21 is Figure 6 The bottom plate 212 shown in the figure. The frame 211 is provided with a first opening 2101 on one side in the axial direction X of the box body 21 and a second opening opposite to the first opening 2101 on the other side. The bottom plate 212 covers the frame 211 to close the second opening. The bottom plate 212 can be a sheet metal part for blocking the second opening of the frame 211, or a heat exchange part for blocking the second opening and exchanging heat with the battery cells installed in the accommodation space 201.

[0079] The cover body 22 is used to cover the frame 211 to block the first opening 2101 of the box body 21, so that the box body 21 and the cover body 22 are connected into a closed form, which can better accommodate and protect the battery cells, and can reduce the influence of liquid or other foreign objects on the charging or discharging of the battery cells. The cover body 22 can be fixedly connected to one end of the frame 211 in the axial direction X of the box body 21, that is, the edge part of the cover body 22 abuts against and is fixedly connected to one end of the frame 211 in the axial direction X of the box body 21. For example, the cover body 22 can be a sheet metal part that blocks the first opening 2101 of the frame 211.

[0080] At the same time, the frame 211 itself has a receiving groove 2110 communicating with the receiving space 201, and the heat insulation layer 24 is at least partially received in the receiving groove 2110. Therefore, the frame 211 also serves as an installation structure for the heat insulation layer 24, and can realize the installation of the heat insulation layer 24 without increasing the overall size of the battery box 20.

[0081] As a component that plays a heat insulation role for the battery box 20, the heat insulation layer 24 can reduce the heat exchange between the battery cells inside the battery box 20 and the external environment, so that the battery cells work within a suitable temperature range. The heat insulation layer 24 can be made of non-metallic materials. Non-metallic materials have low thermal conductivity and have heat insulation functions. Exemplarily, the heat insulation layer 24 can be made of foaming materials, such as polyurethane (abbreviated as PU) foaming materials, expanded polypropylene (abbreviated as EPP) foaming materials, etc. Foaming materials such as polyurethane and polypropylene have good heat insulation performance, and have strong compressive strength and tensile strength, can withstand a certain external pressure, and the polyurethane foaming material has a rich pore structure inside, and can absorb impact energy through its own elastic deformation, so it also has good buffering and protection effects. The heat insulation layer 24 can also be made of non-metallic materials with certain heat insulation performance such as but not limited to heat insulation foam.

[0082] The meaning that the heat insulation layer 24 is at least partially received in the receiving groove 2110 means that the heat insulation layer 24 can be completely received in the receiving groove 2110, or only partially received in the receiving groove 2110, and the other part is located outside the receiving groove 2110 and extends towards the receiving space 201.

[0083] The overall structure formed by the box body 21 and the cover body 22 can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder or sphere. The materials of the box body 21 and the cover body 22 can be metal materials, such as alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber reinforced epoxy resin.

[0084] The first connecting member 23 is used to connect the frame 211 and the cover 22, so that the box body 21 and the cover 22 are integrally connected to form a stable shape.

[0085] And the first connecting member 23 is inserted into the receiving groove 2110 along the axial direction X of the box body 21. Therefore, the dimension of the receiving groove 2110 in the radial direction Y of the box body 21 is at least the dimension of the first connecting member 23 in the radial direction Y of the box body 21, so that the heat insulation layer 24 in the receiving groove 2110 can have a relatively large dimension in the radial direction Y. The dimension of the heat insulation layer 24 in the radial direction Y can be defined as the thickness of the heat insulation layer 24, that is, the heat insulation layer 24 has a relatively large thickness, and the heat insulation effect of the battery box 20 is better.

[0086] It can be seen that in the battery box 20 provided by the embodiment of the present application, the cover 22 is covered on one side of the frame 211 in the axial direction X of the box body 21 through the first connecting member 23 to close the first opening 2101 of the box body 21, so that the box body 21 and the cover 22 are connected into a closed shape to better accommodate and protect the battery cells. And the first connecting member 23 is inserted into the receiving groove 2110, and the dimension of the receiving groove 2110 in the radial direction Y of the box body 21 is at least the dimension of the first connecting member 23 in the radial direction Y of the box body 21. Therefore, the heat insulation layer 24 in the receiving groove 2110 can also have a relatively large thickness, and the heat insulation effect of the heat insulation layer 24 is better. And because the heat insulation layer 24 is located inside the frame 211, the heat insulation effect of the battery box 20 can be improved without increasing the overall external dimension of the battery box 20.

[0087] In the related art, the cross-section of the frame 211 is a closed cavity structure, and there are a plurality of reinforcing ribs extending along the circumferential direction of the frame 211 inside the frame 211, so that a plurality of closed cavities extending along the circumferential direction of the frame 211 are formed inside the frame 211, thereby improving the strength and stiffness of the frame 211 itself. The first connecting member 23 for connecting the frame 211 and the cover 22 penetrates into the cavity inside the frame 211, and the heat insulation layer 24 is arranged outside the cavity. At the same time, due to the need to penetrate the first connecting member 23, the dimension of the cavity itself in the radial direction Y is usually larger than the dimension of the heat insulation layer 24 outside the cavity in the radial direction Y. In the structure of this battery box 20, limited by the overall external dimension of the battery box 20, the thickness of the heat insulation layer 24 arranged outside the cavity of the frame 211 is usually small, so the heat insulation performance is not ideal.

[0088] And in the present application, the cavity inside the structure of the frame 211 is also used as the installation space of the heat insulation layer 24, so that the thickness of the heat insulation layer 24 can be increased to improve the heat insulation effect of the battery box 20.

[0089] In addition, in the embodiments of the present application, since the thermal insulation layer 24 generally uses non-metallic materials and the frame 211 itself generally uses metallic materials, the density of non-metallic materials can be about 2 to 3 times lower than that of metals. Therefore, compared with the structure of the frame 211 of the battery box 20 in the related art, which has multiple reinforcing ribs inside to form multiple closed cavities, the battery box 20 of the present application also has a weight reduction effect and meets the lightweight requirements of the battery box 20.

[0090] It should be noted that the structure of the frame 211 in the embodiments of the present application can be regarded as canceling the closed cavity structure inside the frame 211 in the related art, that is, sacrificing part of the strength and stiffness of the frame 211 to improve the thermal insulation effect. Therefore, the battery box 20 provided by the present application is more suitable for battery devices 100 with relatively small overall dimensions and light weights (the number of battery cells inside the battery box 20 is relatively small). For example, when the electrical device is a vehicle, the battery box 20 provided by the present application can be applied to battery devices 100 with relatively small overall dimensions and light weights in hybrid vehicles and the like. Of course, it is not excluded that the battery box 20 of the present application is applicable to battery devices 100 with relatively large overall dimensions and heavy weights (the number of battery cells inside the battery box 20 is relatively large), such as pure electric vehicles. When the battery box 20 of the present application is applied to battery devices 100 with relatively large overall dimensions and heavy weights, such as pure electric vehicles, a frame material with greater material strength can be used to improve its strength and stiffness.

[0091] In some embodiments, the frame 211 includes a plurality of frame bodies 211A arranged along the circumference of the box body 21. At least one frame body 211A includes a side wall plate 2111, a first connecting plate 2112, and a second connecting plate 2113. The side wall plate 2111 extends along the circumference of the frame 211. The first connecting plate 2112 and the second connecting plate 2113 are connected to both sides of the side wall plate 2111 in the axial direction X. The first connecting plate 2112 and the second connecting plate 2113 both extend at least partially in the radial direction Y of the box body 21 toward the accommodation space 201 to jointly form the above-mentioned accommodation groove 2110 with the side wall plate 2111.

[0092] In the embodiments of the present application, at least one frame body 211A includes a side wall plate 2111, a first connecting plate 2112, and a second connecting plate 2113. The first connecting plate 2112 and the second connecting plate 2113 both extend at least partially along the radial direction Y of the box body 21 towards the accommodating space 2110, such that the overall frame body 211A forms an accommodating groove 2110 approximately in the shape of a "C". The frame body 211A with the accommodating groove 2110 has a simple structure and a relatively simple forming process. Moreover, the first connecting plate 2112 and the second connecting plate 2113 both extend at least partially along the radial direction Y of the box body 21 towards the accommodating space 201. The first connecting plate 2112 can be conveniently connected and fixed to the cover body 22, and the second connecting plate 2113 can be conveniently connected and fixed to other parts of the box body 21 except for the frame 211 (such as the bottom plate 212 of the box body 21).

[0093] In the embodiments of the present application, the frame body 211A of the frame 211 is not limited to the structure formed by sequentially connecting the three plates of the side wall plate 2111, the first connecting plate 2112, and the second connecting plate 2113 as described above, and can also be formed by sequentially connecting more than three plates to form the above-mentioned accommodating groove 2110.

[0094] The frame body 211A having the side wall plate 2111, the first connecting plate 2112, and the second connecting plate 2113 can be manufactured by an extrusion molding process for profiles, or can also be formed by stamping or rolling of sheet metal parts.

[0095] In some embodiments, the number of the frame bodies 211A of the frame 211 is four. The multiple frame bodies 211A are sequentially connected end to end. The multiple frame bodies 211A are respectively a first frame body, a second frame body, a third frame body, and a fourth frame body. The first frame body, the second frame body, the third frame body, and the fourth frame body form a frame 211 approximately in the shape of a rectangle. That is, the first frame body, the second frame body, the third frame body, and the fourth frame body are respectively the four sides of the rectangular frame 211. Figure 2 The case where the number of the frame bodies 211A of the frame 211 is four is shown such that the frame 211 forms a rectangular frame structure. It can be understood that the frame 211 is an annular frame structure formed by sequentially connecting multiple frame bodies 211A end to end. The number of the frame bodies 211A of the frame 211 can also be other numbers except for four, and the shape of the frame 211 can also be other annular shapes except for a rectangle.

[0096] When the border 211 adopts the above-mentioned rectangular annular border 211, the heat-insulating layer 24 can be arranged in one of the boxes 211A, or in two opposite boxes 211A, or in three adjacent boxes 211A. Generally speaking, functional components such as water inlet and outlet joints and high and low pressure joints are arranged on one of the boxes 211A of the border 211. Usually, the heat-insulating layer is not arranged in the box 211A where the water inlet and outlet joints and high and low pressure joints are arranged. At the same time, the box 211A where the water inlet and outlet joints and high and low pressure joints are arranged can also not be provided with the structure of the receiving groove 2110, so that the box 211A where the water inlet and outlet joints and high and low pressure joints are arranged has greater strength and stiffness, and is also convenient for installing the water inlet and outlet joints and high and low pressure joints. Figure 2 The situation where the heat-insulating layer 24 is arranged in two opposite boxes 211A of the border 211 is shown.

[0097] In some embodiments, the heat-insulating layer 24 is integrally formed in the receiving groove 2110.

[0098] In the embodiment of the present application, by integrally forming the heat-insulating layer 24 in the receiving groove 2110, the heat-insulating layer 24 and the box 211A can form an inseparable integral structure. The connection and fixation of the heat-insulating layer 24 and the box 211A are realized through the forming of the heat-insulating layer 24, which can simplify the connection and assembly process of the heat-insulating layer 24 and the box 211A.

[0099] In the related art, in the connection and assembly process of the heat-insulating layer 24 and the box 211A, the heat-insulating layer 24 and the box 211A are respectively manufactured and formed first, and then the heat-insulating layer 24 and the box 211A are assembled and bonded and fixed through adhesives such as glue. Since the heat-insulating layer 24 and the box 211A are two independent components, the tolerance and clearance during assembly need to be considered when the heat-insulating layer 24 and the box 211A are assembled, resulting in difficult assembly. In the embodiment of the present application, the heat-insulating layer 24 is integrally formed in the receiving groove 2110 of the box 211A, and the forming process of the heat-insulating layer 24 realizes the connection between the heat-insulating layer 24 and the box 211A, eliminating the subsequent assembly process required for the heat-insulating layer 24 and the box 211A, thus improving the manufacturing efficiency of the battery box 20.

[0100] In the embodiment of the present application, the thermal insulation layer 24 can be formed by an injection molding process. The frame body 211A is used as an embedded part and buried in the injection mold. The cavity of the injection mold is filled with injection molding raw materials, so that the injection molding raw materials solidify to form the thermal insulation layer 24. When the injection molding raw materials are the aforementioned foaming materials, the injection molding process can also be called foam injection molding. The injection molding raw materials are usually polymers and various additives. The raw materials are mixed and heated and plasticized. The mixed raw materials after heating and plasticizing are injected into the cavity of the injection mold. The mixed raw materials expand and fill the cavity. After the mixed raw materials are cooled and shaped, it is the thermal insulation layer 24. Open the mold cavity and take out the integral structure formed by the thermal insulation layer 24 and the frame body 211A, and the integral thermal insulation layer 24 and the frame body 211A in the embodiment of the present application can be obtained.

[0101] Specifically, reference can be made to Figure 7 and Figure 8 , Figure 7 which is a schematic diagram of the injection molding process of the thermal insulation layer in the battery box provided according to one or more embodiments of the present application. Figure 8 is Figure 7 a cross-sectional view of the injection mold in the mold closing state in Figure 7 where (a)-(f) show the respective stages of the injection molding of the thermal insulation layer 24. Figure 7 The structures of the thermal insulation layer 24 and the frame body 211A shown in the schematic diagram of the injection molding process are only for illustration, aiming to show each step of the injection molding process, and do not limit the specific structures of the thermal insulation layer 24 and the frame body 211A.

[0102] In the embodiment of the present application, the thermal insulation layer 24 is formed by injection molding through the injection mold 1. Specifically, the injection mold 1 includes an injection mold body 101. The injection mold body 101 includes a first mold 102 and a second mold 103. A fixing cavity 1030 for accommodating the frame body 211A is recessed on the side of the second mold 103 facing the first mold 102. After the frame body 211A is placed in the fixing cavity 1030, the first mold 102 and the second mold 103 are closed. In the closed state, the first mold 102 and the second mold 103 with the frame body 211A jointly enclose a mold cavity ( Figure 7 not shown in

[0103] In the embodiments of the present application, there can also be multiple ways to inject the injection molding raw material into the mold cavity. After the frame 211A is fixed to the fixed cavity 1030 of the second mold 103, the first mold 102 and the second mold 103 can be first closed, and then the injection molding raw material 2 is injected into the mold cavity formed after closing the mold, so that the injection molding raw material 2 fills the mold cavity; or the injection molding raw material 2 can be first placed in the receiving groove 2110 of the frame 211A, that is, at the bottom of the receiving groove 2110 ( Figure 7 as shown in (c) in the figure), and then the first mold 102 and the second mold 103 are closed, and the injection molding raw material 2 placed in the receiving groove 2110 automatically fills the mold cavity during the mold closing process, Figure 7 This injection method of the injection molding raw material 2 is shown.

[0104] Taking Figure 7 the schematic diagram of the injection molding process shown as an example, the injection molding process of the injection mold 1 in the embodiments of the present application is roughly described as follows:

[0105] First, prepare the injection mold 1, and the first mold 102 and the second mold 103 of the injection mold 1 are in the open mold state ( Figure 7 as shown in (a) in the figure), and the frame 211A is fixed to the fixed cavity 1030 of the second mold 103 as an embedded part ( Figure 7 as shown in (b) in the figure); then the injection molding raw material 2 is placed at the bottom of the receiving groove 2110 ( Figure 7 as shown in (c) in the figure); then the first mold 102 and the second mold 103 are closed ( Figure 7 the closed mold state of the first mold 102 and the second mold 103 is shown in (d) in the figure), and the injection molding raw material 2 placed at the bottom of the receiving groove 2110 automatically fills the mold cavity; after the injection molding raw material 2 in the mold cavity is cooled and solidified, that is, the frame 211A and the thermal insulation layer 24 are connected into an integrated structure, and the first mold 102 and the second mold 103 are then opened ( Figure 7 the open mold state of the first mold 102 and the second mold 103 is shown in (e) in the figure), the first mold 102 is separated from the frame 211A and the thermal insulation layer 24 that are connected into an integrated structure, and finally the frame 211A and the thermal insulation layer 24 that are connected into an integrated structure are taken out from the second mold 103, so as to obtain the frame 211A and the thermal insulation layer 24 that are connected into an integrated structure as shown in Figure 7 (f) in the figure).

[0106] In some embodiments, referring back to Figures 3 to 6 , one end of the first connecting plate 2112 facing the accommodating space 201 and one end of the second connecting plate 2113 facing the accommodating space 201 are spaced apart in the axial direction X of the box body 21 to form a window 2110A, the accommodating groove 2110 communicates with the accommodating space 201 through the window 2110A, and the dimension Hp of the window 2110A in the axial direction X of the box body 21 is greater than or equal to 50 mm.

[0107] In the embodiment of the present application, the accommodation groove 2110 communicates with the accommodation space 201 through the window 2110A. The window 2110A can be used as an injection port for the injection raw material of the heat insulation layer 24 during injection molding. To facilitate the injection of the injection raw material into the accommodation groove 2110 through the window 2110A, the size Hp of the window 2110A should be designed within a reasonable range. In the embodiment of the present application, the size Hp of the window 2110A in the axial direction X of the box body 21 is set to be greater than or equal to 50 mm, which can facilitate the injection of the injection raw material from the window 2110A into the accommodation groove 2110.

[0108] Exemplarily, the size Hp of the window 2110A in the axial direction X of the box body 21 can be 50 mm, 52 mm, 54 mm, 56 mm, 58 mm or 60 mm, etc.

[0109] In some embodiments, along the circumferential direction of the frame 211, that is, along the length direction of the frame body 211A, the window 2110A extends from one end of the frame body 211A to the other end of the frame body 211A, that is, the window 2110A penetrates the entire length range of the frame body 211A. In other embodiments, the window 2110A only penetrates a partial length range of the frame body 211A. Figure 3 and Figure 4 The situation where the window 2110A penetrates the entire length range of the frame body 211A is shown.

[0110] It can be understood that the window 2110A is used as an injection port for the injection raw material. The structure of the window 2110A and the dimensions of the window 2110A in the axial direction X of the box body 21 and along the length direction of the frame body 211A are subject to facilitating the injection of the injection raw material into the window 2110A and the overall manufacturing and forming of the frame body 211A. Considering the convenience of the overall manufacturing and forming of the frame body 211A, in the embodiment of the present application, the window 2110A can be set to penetrate the entire length range of the frame body 211A, and along the length direction of the frame body 211A, the cross-sectional shapes of each part of the frame body 211A are the same. Therefore, the overall manufacturing and forming of the frame body 211A can adopt the profile extrusion process for integral forming. The manufacturing method of the frame body 211A is simple and the manufacturing cost is low. The window 2110A of the frame body 211A manufactured by this process penetrates the entire length range of the frame body 211A, so it is also convenient for the injection of the injection raw material.

[0111] For the case where the window 2110A only penetrates a partial length range of the housing 211A, the window 2110A can be processed by making a hole in the wall surface of the housing 211A facing the accommodation space 201 in the radial direction Y of the housing 21. It can be understood that compared with the case where the window 2110A penetrates the entire length range of the housing 211A, when the window 2110A only penetrates a partial length range of the housing 211A, the overall strength and stiffness of the housing 211A are higher, but the manufacturing and processing process of the housing 211A is also more difficult. Therefore, the specific length range of the window 2110A penetrating the housing 211A can be selected according to the total weight of the battery cells accommodated in the housing 21, so that the housing 211A can achieve the actual required strength and stiffness.

[0112] In some embodiments, referring again to Figure 5 and Figure 6 , the thermal insulation layer 24 protrudes from the window 2110A in the radial direction Y of the housing 21 towards the accommodation space 201; wherein, the thermal insulation layer 24 is an insulating member, or the surface of the thermal insulation layer 24 facing the accommodation space 201 in the radial direction Y of the housing 21 is at least coated with an insulating layer.

[0113] In the embodiments of the present application, since the thermal insulation layer 24 is an insulating member, or the surface of the thermal insulation layer 24 facing the accommodation space 201 in the radial direction Y of the housing 21 is at least coated with an insulating layer, the thermal insulation layer 24 has insulating properties. By the thermal insulation layer 24 protruding from the window 2110A in the radial direction Y of the housing 21 towards the accommodation space 201, the thermal insulation layer 24 can also reduce the risk of direct electrical contact between the side of the battery cell and the side wall of the frame 211 in the radial direction Y of the housing 21, that is, the thermal insulation layer 24 can simultaneously play the roles of heat preservation and insulation protection, and can replace the insulation protection components of the battery box 20.

[0114] When the thermal insulation layer 24 is an insulating member, the thermal insulation layer 24 can adopt the above-mentioned foaming materials such as polyurethane or polypropylene, or other types of non-metallic materials such as thermal insulation foam, etc., to play the insulating role of the thermal insulation layer 24.

[0115] In some embodiments, referring again to Figure 5 and Figure 6 , the first connecting member 23 includes a first connecting sleeve 231 and a first fastening member 232. The first connecting sleeve 231 is fixed to the first connecting plate 2112 and inserted into the accommodation groove 2110, and the first fastening member 232 passes through the cover body 22 and is fastened into the first connecting sleeve 231.

[0116] In the embodiments of the present application, the first connecting member 23 is provided to include a first connecting sleeve 231 and a first fastener 232. The first connecting sleeve 231 can be pre-passed through and fixed to the first connecting plate 2112 of the frame 211A. The first connecting sleeve 231 can cooperate with the first fastener 232 to facilitate the connection between the frame 211A and the cover 22. Moreover, the first fastener 232 is installed through the first connecting sleeve 231, which can reduce the interference between the first fastener 232 and the thermal insulation layer 24 during installation.

[0117] Especially when the thermal insulation layer 24 is integrally formed in the receiving groove 2110, since the thermal insulation layer 24 needs to be injection-molded through an injection mold, the first connecting sleeve 231 together with the frame 211A are both pre-buried in the injection mold as embedded parts. The outer surface of the first connecting sleeve 231 can be used as part of the boundary of the cavity of the injection mold to facilitate the formation of the thermal insulation layer 24 in the space outside the first connecting sleeve 231 within the receiving space 201. After the thermal insulation layer 24 is injection-molded, there is no thermal insulation layer 24 inside the first connecting sleeve 231. Therefore, the interference with the connection and fastening between the first connecting sleeve 231 and the first fastener 232 can be reduced.

[0118] It can be understood that in order for the injection molding raw material to only fill the space outside the first connecting sleeve 231 and not enter the first connecting sleeve 231 during the injection molding of the thermal insulation layer 24, the end of the first connecting sleeve 231 located in the receiving groove 2110 can be a closed end.

[0119] Exemplarily, the first connecting sleeve 231 can be a threaded sleeve, and the first fastener 232 can be a fastener with an external thread such as a bolt, so as to realize the locking of the first fastener 232 in the first connecting sleeve 231 through thread fitting.

[0120] In some embodiments, referring again to Figure 2 , the box body 21 further includes a cross beam 25. The cross beam 25 is located in the receiving space 201, and the end of the cross beam 25 is welded to the frame 211. The thermal insulation layer 24 includes a plurality of spaced thermal insulation segments 240 arranged along the circumference of the box body 21. The end of the cross beam 25 is located between adjacent thermal insulation segments 240, and the ends of the thermal insulation segments 240 in the circumferential direction of the box body 21 are spaced from the ends of the connection frame 211 of the cross beam 25 to form an operation space 241 for avoiding the end of the cross beam 25.

[0121] The cross beam 25 is used to divide the accommodation space 201 into a plurality of accommodation sub - spaces 2010. The cross beam 25 can be one or multiple. The end of the cross beam 25 is welded to the frame 211 to achieve the fixed connection of the cross beam 25 relative to the frame 211. Specifically, the two ends of the cross beam 25 are respectively welded to two opposite frames 211A of the frame 211. The end of the cross beam 25 can be welded to the end of the frame 211A in the radial direction Y of the box body 21, or can be welded to the end of the frame 211A in the axial direction X of the box body 21, or can also be welded to the wall of the accommodation groove 2110.

[0122] In the embodiment of the present application, since the heat - insulating layer 24 is integrally formed in the accommodation groove 2110 of the frame 211, when welding the cross beam 25, the heat - insulating layer 24 already exists in the accommodation groove 2110 of the frame 211, and there will be a problem that the heat - insulating layer 24 interferes with the welding of the cross beam 25 to the frame 211. In this embodiment, the heat - insulating layer 24 is set as multiple spaced - apart heat - insulating segments 240. The multiple heat - insulating segments 240 are arranged at intervals along the circumferential direction of the box body 21 (i.e., the length direction of the frame 211A). Since there is a certain distance between adjacent heat - insulating segments 240 along the length direction of the frame 211A, the end of the cross beam 25 can be welded between adjacent heat - insulating segments 240 on the frame 211A. And in the embodiment of the present application, a certain distance is also set between the heat - insulating segment 240 and the end of the cross beam 25. This distance can enable the heat - insulating segment 240 to avoid the welding operation between the end of the cross beam 25 and the frame 211A, and reduce the interference of the heat - insulating segment 240 on the welding of the end of the cross beam 25.

[0123] In the embodiment of the present application, when the heat - insulating layer 24 adopts the scheme including multiple spaced - apart heat - insulating segments 240, in the injection - molding die 1 for forming the heat - insulating layer 24, the mold cavity is a plurality of mutually - separated sub - mold cavities, and the injection - molding raw materials in each sub - mold cavity are shaped to form each heat - insulating segment 240. Corresponding to the scheme that the heat - insulating layer 24 includes multiple spaced - apart heat - insulating segments 240, a plurality of isolation parts 1020 protrude from the side of the first die 102 facing the second die 103, and the adjacent isolation parts 1020 are also arranged at intervals. After the first die 102 and the second die 103 are closed, the plurality of isolation parts 1020 are inserted into the accommodation groove 2110 of the frame 211A fixed in the second die 103 and are in contact with the bottom and the wall of the accommodation groove 2110, so that the cavity between adjacent isolation parts 1020 forms a sub - mold cavity for forming the heat - insulating segment 240. The dimension of the isolation part 1020 along the length direction of the frame 211A is the distance between adjacent heat - insulating segments 240 along the length direction of the frame 211A.

[0124] In some embodiments, please refer to Figure 9 and Figure 10 , Figure 9 is Figure 2 the front view of the frame 211A and the cross beam 25 in the battery box 20.Figure 10 Yes Figure 9 It is an enlarged view of position B in the figure. The dimension L of the operation space 241 along the circumferential direction of the box body 21 is 20 mm to 50 mm, that is, the dimension L of the operation space 241 along the length direction of the frame body 211A is 20 mm to 50 mm. For example, the dimension L of the operation space 241 along the length direction of the frame body 211A can be 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm or 50 mm.

[0125] In the embodiment of the present application, limiting the dimension L of the operation space 241 along the circumferential direction of the box body 21 within the range of 20 mm to 50 mm can reduce the interference of the heat insulation layer 24 on the welding operation of the end of the cross beam 25 while having a good heat insulation effect.

[0126] In some embodiments, the dimension L of the operation space 241 along the circumferential direction of the box body 21 can be further limited to 25 mm to 40 mm.

[0127] In some embodiments, the dimension L of the operation space 241 along the circumferential direction of the box body 21 can be further limited to 30 mm. Limiting the dimension L of the operation space 241 along the circumferential direction of the box body 21 to 30 mm in the embodiment of the present application can obtain the best possible heat insulation effect while minimizing the interference on the welding operation of the end of the cross beam 25.

[0128] In some embodiments, please refer to again Figure 5 , the first connecting plate 2112 includes a connecting portion 21121 and a folded edge 21122. The connecting portion 21121 is connected between the side wall plate 2111 and the folded edge 21122. The folded edge 21122 is bent relative to the connecting portion 21121 towards the second connecting plate 2113. The end portion of the cross beam 25 is partially welded to the folded edge 21122.

[0129] In the embodiment of the present application, providing the folded edge 21122 on the first connecting plate 2112 can facilitate the welding between the end of the cross beam 25 and the frame body 211A and increase the welding area between the end of the cross beam 25 and the first connecting plate 2112.

[0130] In some embodiments, another part of the end of the cross beam 25 can be welded to the bottom and the wall of the receiving groove 2110 to increase the welding area and improve the connection strength between the cross beam 25 and the frame body 211A.

[0131] In some embodiments, the dimension Hz of the folded edge 21122 in the axial direction X of the box body 21 is greater than or equal to 10 mm.

[0132] In the embodiment of the present application, the dimension Hz of the folded edge 21122 in the axial direction X of the box body 21 is set to be greater than or equal to 10 mm, which can meet the minimum welding strength required between the end of the beam 25 and the folded edge 21122.

[0133] Exemplarily, the dimension Hz of the folded edge 21122 in the axial direction X of the box body 21 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0134] It can be understood that the larger the size Hz of the folded edge 21122 in the axial direction X of the box body 21, the larger the welding area between the end of the cross beam 25 and the folded edge 21122, and the higher the connection strength. However, if the size Hz of the folded edge 21122 in the axial direction X of the box body 21 is too large, the size Hz of the window 2110A in the axial direction X of the box body 21 will be too small, thereby affecting the injection of the injection molding material. Therefore, in the embodiment of the present application, the size Hz of the folded edge 21122 in the axial direction X of the box body 21 should not be too large. The specific size Hz of the folded edge 21122 in the axial direction X of the box body 21 can be based on the premise of considering that the required welding strength is met between the end of the cross beam 25 and the folded edge 21122, so as to facilitate the injection of the injection molding material into the window 2110A.

[0135] In some embodiments, refer again to Figure 5 and Figure 6 The box body 21 also includes a bottom plate 212 and a second connecting member 213. The frame 211 has a second opening opposite to the first opening 2101 in the axial direction X of the box body 21. The bottom plate 212 is covered on the frame 211 to block the second opening. The bottom plate 212 includes a heat exchange plate 2121 and a bottom guard plate 2122 both connected to the second connecting plate 2113. The bottom guard plate 2122 is located on the side of the heat exchange plate 2121 away from the accommodating space 201 in the axial direction X of the box body 21. The second connecting member 213 is penetrated through the bottom guard plate 2122 and the second connecting plate 2113 along the axial direction X of the box body 21 and inserted into the accommodating groove 2110. The side wall of the heat exchange plate 2121 in the radial direction Y of the box body 21 is located on the side of the second connecting member 213 facing the accommodating space 201.

[0136] Among them, the heat exchange plate 2121 is used to carry the battery cell and exchange heat with the battery cell to cool the battery cell 10, reduce the heat generated by the battery cell during the use of the battery device 100, and thus alleviate the problem of adverse effects on the performance and service life of the battery device 100 caused by excessive heat of the battery cell 10.

[0137] As an example, the heat exchange plate 2121 contains a heat exchange medium, and the heat exchange medium flows to perform heat exchange with multiple battery cells 10. When the flow of the heat exchange medium is used to cool the battery cells 10, the heat exchange plate 2121 can also be called a cold plate or a cooling plate, and the heat exchange medium here can be a liquid such as water, and the heat exchange plate 2121 can also be called a liquid cooling plate or a water cooling plate.

[0138] In some embodiments, the heat exchange plate 2121 includes a first plate and a second plate, which are fixed together and enclosed to form a heat exchange channel, and the heat exchange channel is used for heat exchange medium to flow through to achieve heat exchange between the heat exchange plate 2121 and the battery cells inside the box 21.

[0139] In the embodiment of the present application, the heat exchange plate 2121 and the bottom guard plate 2122 together constitute the bottom plate 212 of the box body 21. The heat exchange plate 2121 can exchange heat with the battery cells contained in the box body 21 to reduce the heat generated by the battery cells during the use of the battery device 100. The bottom guard plate 2122 can protect the heat exchange plate 2121, reduce the risk of damage to the heat exchange plate 2121, and enhance the protection capability of the bottom of the battery box 20.

[0140] In addition, the second connecting member 213 is penetrated through the bottom guard plate 2122 and the second connecting plate 2113 to fix the bottom guard plate 2122 to the second connecting plate 2113. The side wall of the heat exchange plate 2121 on the radial direction Y of the box body 21 is located on the side of the second connecting member 213 facing the accommodating space 201, that is, the side wall of the heat exchange plate 2121 on the radial direction Y of the box body 21 is closer to the accommodating space 201 than the side wall of the bottom guard plate 2122 on the radial direction Y of the box body 21. The second connecting member 213 is not penetrated through the heat exchange plate 2121 to reduce the influence and interference of the second connecting member 213 on the heat exchange function of the heat exchange plate 2121. The fixation of the heat exchange plate 2121 relative to the second connecting plate 2113 can rely on the edge portion of the heat exchange plate 2121 being abutted against the second connecting plate 2113 after the bottom guard plate 2122 is fixed to the second connecting plate 2113.

[0141] Specifically, an installation step can be provided on the side of the second connecting plate 2113 that is away from the first connecting plate 2112 on the axial direction X of the box body 21. The installation step is located between the second connecting piece 213 and the accommodating space 201 on the radial direction Y of the box body 21. The heat exchange plate 2121 is clamped in the installation step. When the bottom guard plate 2122 is fixed to the second connecting plate 2113, the heat exchange plate 2121 is fixed relative to the second connecting plate 2113.

[0142] Along the axial direction X of the box body 21 , a buffer made of foam or other materials may be sandwiched between the bottom guard plate 2122 and the heat exchange plate 2121 to achieve buffering and protection for the heat exchange plate 2121 and the bottom of the battery cell in the accommodating space 201 .

[0143] In some embodiments, the second connecting member 213 includes a second connecting sleeve 2131 and a second fastener 2132. The second connecting sleeve 2131 is fixed to the second connecting plate 2113 and inserted into the receiving groove 2110, and the second fastener 2132 passes through the bottom plate 212 and is fastened into the second connecting sleeve 2131.

[0144] In the embodiments of the present application, the second connecting member 213 is provided to include a second connecting sleeve 2131 and a second fastener 2132. The second connecting sleeve 2131 can be pre-passed through and fixed to the second connecting plate 2113 of the frame 211A. The second connecting sleeve 2131 can cooperate with the second fastener 2132 to facilitate the connection between the frame 211A and the bottom plate 212. Moreover, the second fastener 2132 is installed through the second connecting sleeve 2131, which can reduce the interference between the second connecting member 213 and the thermal insulation layer 24 during installation.

[0145] Especially when the thermal insulation layer 24 is integrally formed in the receiving groove 2110, since the forming of the thermal insulation layer 24 requires injection molding through an injection mold, the second connecting sleeve 2131 together with the frame 211A is used as a pre-embedded part and embedded into the injection mold. The outer surface of the second connecting sleeve 2131 can be used as a part of the boundary of the cavity of the injection mold to facilitate the formation of the thermal insulation layer 24 in the space outside the second connecting sleeve 2131 within the receiving space 201. After the thermal insulation layer 24 is injection molded, there is no thermal insulation layer 24 inside the second connecting sleeve 2131. Therefore, the interference with the connection and fastening between the second connecting sleeve 2131 and the second fastener 2132 is small.

[0146] It can be understood that in order to ensure that the injection molding material only fills the space outside the second connecting sleeve 2131 and does not enter the second connecting sleeve 2131 during the injection molding of the thermal insulation layer 24, the ends of the second connecting sleeve 2131 located in the receiving groove 2110 are both closed ends.

[0147] Exemplarily, the second connecting sleeve 2131 can be a threaded sleeve, and the second fastener 2132 can be a fastener with an external thread such as a bolt, so as to realize the locking of the second fastener 2132 in the second connecting sleeve 2131 through thread cooperation.

[0148] In some embodiments, referring again to Figure 5 and Figure 6 , along the radial direction Y of the box body 21, the end of the second connecting plate 2113 facing the receiving space 201 is closer to the receiving space 201 than the end of the first connecting plate 2112 facing the receiving space 201.

[0149] The thermal insulation layer 24 protrudes from the receiving groove 2110 in the radial direction Y of the box body 21, and the thermal insulation layer 24 at least covers the side wall of the second connecting plate 2113 in the radial direction Y of the box body 21; wherein, the thermal insulation layer 24 is an insulating member, or the surface of the thermal insulation layer 24 facing the accommodation space 201 at least in the radial direction Y of the box body 21 is coated with an insulating layer.

[0150] Wherein, when the first connecting plate 2112 includes a connecting portion 21121 and a folded edge 21122, one end of the first connecting plate 2112 facing the accommodation space 201 is the wall surface of the folded edge 21122 in the radial direction Y of the box body 21.

[0151] In the embodiment of the present application, one end of the second connecting plate 2113 facing the accommodation space 201 is closer to the accommodation space 201 than one end of the first connecting plate 2112 facing the accommodation space 201, which can make the size of the second connecting plate 2113 in the radial direction Y of the box body 21 larger than the size of the first connecting plate 2112 in the radial direction Y of the box body 21, and can meet the requirements that the first connecting plate 2112 is provided with a first connecting member 23, and the second connecting plate 2113 is provided with a second connecting member 213 and the heat exchange plate 2121 is connected inside the second connecting member 213 on the second connecting plate 2113.

[0152] And in the embodiment of the present application, the thermal insulation layer 24 also has insulating properties at the same time. The thermal insulation layer 24 is arranged to protrude from the receiving groove 2110 in the radial direction Y of the box body 21, which can reduce the risk of electrical contact between the frame body 211A and the side part of the battery cell in the accommodation space 201.

[0153] At the same time, since one end of the second connecting plate 2113 facing the accommodation space 201 is closer to the accommodation space 201 than one end of the first connecting plate 2112 facing the accommodation space 201, one end of the second connecting plate 2113 facing the accommodation space 201 is more likely to have electrical contact with the side part of the battery cell in the accommodation space 201. In the embodiment of the present application, the thermal insulation layer 24 at least covers the side wall of the second connecting plate 2113 in the radial direction Y of the box body 21, which can reduce the risk of electrical contact between one end of the second connecting plate 2113 facing the accommodation space 201 and the side part of the battery cell in the accommodation space 201.

[0154] The thermal insulation layer 24 may cover the side wall of the first connecting plate 2112 in the radial direction Y of the box body 21, or may not cover the side wall of the first connecting plate 2112 in the radial direction Y of the box body 21.

[0155] In the embodiment of the present application, the dimension W of the side wall of the second connecting plate 2113 on the radial direction Y of the box body 21 covered by the insulation layer 24 can be designed according to the distance between the insulation layer 24 and the battery cell on the radial direction Y of the box body 21. For example, the dimension W of the side wall of the second connecting plate 2113 on the radial direction Y of the box body 21 covered by the insulation layer 24 can be 2mm, 3mm, 4mm, etc. The dimension W of the side wall of the second connecting plate 2113 on the radial direction Y of the box body 21 should not be too large, as long as it can cover the side wall of the second connecting plate 2113 on the radial direction Y of the box body 21. Otherwise, the distance between the insulation layer 24 and the battery cell on the radial direction Y of the box body 21 will be too small, making it difficult for the battery cell to be installed in the accommodating space 210.

[0156] In some embodiments, refer again to Figure 5 and Figure 6 The frame 211 further includes a mounting arm 214. The mounting arm 214 is used as a mounting component for mounting the battery box 20 on a vehicle. The battery box 20 is mounted to an electrical device such as a vehicle through the mounting arm 214.

[0157] Specifically, the mounting arm 214 can be set on two opposite frames 211A of the frame 211, and the mounting arm 214 is located on the side of the frame 211A away from the accommodating groove 2110 in the radial direction Y, so as to facilitate the battery box 20 to be mounted on a vehicle or other electrical device through two opposite mounting arms 214.

[0158] In order to increase the strength and rigidity of the mounting arm 214 while meeting the lightweight requirements, multiple cavities may be provided inside the mounting arm 214, that is, the mounting arm 214 may have multiple reinforcing ribs extending along the length direction of the frame 211A, so that multiple cavities extending along the length direction of the frame 211A are formed inside the mounting arm 214. The strength and rigidity of the mounting arm 214 are increased by the multiple reinforcing ribs inside the mounting arm 214. The provision of multiple cavities inside the mounting arm 214 also makes the mounting arm 214 lighter, meeting the lightweight requirements of the mounting arm 214.

[0159] The mounting arm 214 can be integrally formed with the frame 211A by using a profile extrusion process, so as to simplify the manufacturing process of the frame 211A and the mounting arm 214 .

[0160] The present application also provides a battery device. Figures 11 to 14 , Figure 11 is an exploded view of a battery device according to one or more embodiments provided in the present application, Figure 12 is a top view of a battery device according to one or more embodiments provided in the present application, Figure 13 yes Figure 12 Middle CC cross section, Figure 14 yes Figure 13An enlarged view of position D in the figure. The battery device 100 may include a battery box 20 and battery cells 10, and the battery cells 10 are accommodated in the accommodation space 201 of the battery box 20. For the introduction of the battery box 20, reference may be made to the above description, which will not be elaborated here.

[0161] In the battery device 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, parallel or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 10. It may be that multiple battery cells 10 are first connected in series, parallel or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, parallel or in a combined series-parallel connection to form an entirety and are accommodated in the battery box 20. It may also be that all the battery cells 10 are directly connected in series, parallel or in a combined series-parallel connection together, and then the entirety formed by all the battery cells 10 is accommodated in the battery box 20. In some embodiments, the battery device 100 may further include a busbar component, and the multiple battery cells 10 may be electrically connected through the busbar component to achieve series, parallel or combined series-parallel connection of the multiple battery cells 10. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0162] In some embodiments, along the radial direction Y of the box body 21, the battery cell 10 and the thermal insulation layer 24 are spaced apart, and the distance Hc between the battery cell 10 and the thermal insulation layer 24 is 5 mm to 40 mm. Exemplarily, the distance Hc between the battery cell 10 and the second buffer part 232 may be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm or 40 mm.

[0163] It can be understood that the larger the distance Hc between the battery cell 10 and the thermal insulation layer 24, the easier it is to assemble the battery cell 10 into the battery box 20, but the smaller the battery energy density; the smaller the distance Hc between the battery cell 10 and the thermal insulation layer 24, the more difficult it is to assemble the battery cell 10 into the battery box 20, but the larger the battery energy density.

[0164] In this embodiment, the distance Hc between the battery cell 10 and the thermal insulation layer 24 in the radial direction of the box body 21 is limited within the range of 5 mm to 40 mm, which is not only convenient for assembling multiple battery cells 10 into the battery box 20, but also can improve the space utilization rate in the battery box 20, thereby increasing the battery energy density.

[0165] In some embodiments, along the radial direction of the box body 21, the distance Hc between the battery cell 10 and the thermal insulation layer 24 is 10 mm to 20 mm. Further limiting the distance Hc between the battery cell 10 and the thermal insulation layer 24 within the more optimal range of 10 mm to 20 mm can obtain a relatively large battery energy density while the difficulty of assembling multiple battery cells 10 into the battery box 20 is relatively small.

[0166] An embodiment of the present application further provides an electrical device, which includes the above battery device 100, and the battery device 100 is used to provide electrical energy for the electrical device. The description of the electrical device can be referred to the above records and will not be elaborated here.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery box, characterized in that: include: A box body, a cover body, a first connecting piece and a thermal insulation layer, wherein the box body is provided with a first opening at one end in the axial direction of the box body, the box body includes a frame, and the frame is extended along the circumference of the box body, the cover body is connected to the frame to block the first opening to form a receiving space for receiving a battery cell, the frame has a receiving groove connected to the receiving space, the thermal insulation layer is at least partially received in the receiving groove, and the first connecting piece is passed through the frame and the cover body along the axial direction of the box body and inserted into the receiving groove.

2. The battery box according to claim 1, characterized in that: The frame includes a plurality of frames arranged along the circumference of the box body, at least one frame includes a side wall plate, a first connecting plate and a second connecting plate, the side wall plate is extended along the circumference of the box body, the first connecting plate and the second connecting plate are connected to both sides of the side wall plate in the axial direction of the box body, and the first connecting plate and the second connecting plate both extend at least partially along the radial direction of the box body toward the accommodating space to form the accommodating groove together with the side wall plate.

3. The battery box according to claim 2, characterized in that: The heat-insulating layer is integrally formed in the containing groove.

4. The battery box according to claim 3, characterized in that: One end of the first connecting plate facing the accommodating space and one end of the second connecting plate facing the accommodating space are spaced apart in the axial direction of the box body to form a window, the accommodating groove is connected to the accommodating space through the window, and the size of the window in the axial direction of the box body is greater than or equal to 50 mm.

5. The battery box according to claim 4, characterized in that: The heat-insulating layer protrudes from the window in the radial direction of the box body toward the accommodating space; wherein the heat-insulating layer is an insulating member, or the heat-insulating layer is coated with an insulating layer at least on a surface of the box body in the radial direction toward the accommodating space.

6. The battery box according to claim 2 or 3, characterized in that: The first connecting member includes a first connecting sleeve and a first fastener. The first connecting sleeve is fixed to the first connecting plate and inserted into the accommodating groove. The first fastener passes through the cover body and is fastened to the first connecting sleeve.

7. The battery box according to claim 5, characterized in that: The box body further comprises a crossbeam, the crossbeam is located in the accommodation space, and an end of the crossbeam is welded to the frame; The insulation layer includes a plurality of spaced insulation sections arranged along the circumference of the box body, the end of the beam is located between adjacent insulation sections, and the end of the insulation section in the circumferential direction of the box body is spaced from the end of the beam connected to the frame to form an operating space for avoiding the end of the beam.

8. The battery box according to claim 7, characterized in that: The size of the operating space along the circumference of the box body is 20 mm to 50 mm.

9. The battery box according to claim 7, characterized in that: The first connecting plate includes a connecting portion and a folded edge, the connecting portion is connected between the side wall plate and the folded edge, the folded edge is bent relative to the connecting portion toward the second connecting plate, and the end portion of the crossbeam is welded to the folded edge.

10. The battery box according to claim 9, characterized in that: The dimension of the folded edge in the axial direction of the box body is greater than or equal to 10 mm.

11. The battery box according to claim 6, characterized in that: The box body also includes a bottom plate and a second connecting piece, the frame has a second opening opposite to the first opening in the axial direction of the box body, the bottom plate cover is arranged on the frame to block the second opening, the bottom plate includes a heat exchange plate and a bottom guard plate both connected to the second connecting plate, the bottom guard plate is located on the side of the heat exchange plate away from the accommodating space in the axial direction of the box body, the second connecting piece is penetrated through the bottom guard plate and the second connecting plate along the axial direction of the box body and inserted into the accommodating groove, and the side wall of the heat exchange plate in the radial direction of the box body is located on the side of the second connecting piece facing the accommodating space.

12. The battery box according to claim 11, characterized in that: Along the radial direction of the box body, one end of the second connecting plate facing the accommodating space is closer to the accommodating space than one end of the first connecting plate facing the accommodating space; The thermal insulation layer protrudes out of the accommodating groove in the radial direction of the box body, and the thermal insulation layer at least covers the radial side wall of the second connecting plate in the box body; wherein the thermal insulation layer is an insulating member, or the thermal insulation layer is at least coated with an insulating layer on the surface of the box body facing the accommodating space in the radial direction.

13. A battery device, characterized in that: include: Battery cells; A battery box as described in any one of claims 1-12; wherein the battery cell is accommodated in the accommodating space.

14. The battery device according to claim 13, characterized in that: Along the radial direction of the box body, the battery cells and the thermal insulation layer are spaced apart, and the distance between the battery cells and the thermal insulation layer is 5 mm to 40 mm.

15. An electrical device, characterized in that: It comprises the battery device as claimed in claim 13 or 14, wherein the battery device is used to provide electrical energy to the electrical device.

Images