Box body, battery and electrical device

Abstract

The present application is suitable for the technical field of power batteries, and provides a box body (400), a battery (200) and an electrical device (100). The box body comprises: a lower box body (40), which comprises a box body steel layer and a box body aluminum layer; and a temperature control assembly (50), which is connected to the lower box body, the temperature control assembly comprising a temperature control aluminum layer, and the temperature control aluminum layer being welded to the box body aluminum layer. The box body of the present application enables the material of the side of the temperature control assembly connected to the lower box body to be same as the material of the side of the lower box body connected to the temperature control assembly, so that the temperature control assembly can be connected to the lower box body more stably, thus reducing the difficulty of connecting the temperature control assembly to the lower box body.

Description

Box, battery and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 6, 2024, with application number 202410256668.6, and invention name “Box, Battery and Electrical Equipment”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of power batteries, and in particular to a box, a battery and an electrical device. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] Batteries are prone to overheating during use, so a cold plate is usually required to control the battery temperature. Currently, the cold plate is usually fixed to the battery case using structural parts or a large number of bolts. This installation method is cumbersome and easily increases the overall weight of the battery. Summary of the Invention

[0005] In view of the above problems, the present application provides a box, a battery and an electrical device, which alleviate the problem that the cold plate fixing process is cumbersome and easily increases the overall weight of the battery.

[0006] In a first aspect, an embodiment of the present application provides a box for accommodating a battery cell, the box comprising:

[0007] The lower box body includes a box body steel layer and a box body aluminum layer;

[0008] The temperature control component is connected to the lower box body. The temperature control component includes a temperature control aluminum layer, and the temperature control aluminum layer is welded to the aluminum layer of the box body.

[0009] In the technical solution of this embodiment, the temperature control aluminum layer of the temperature control component is connected to the box aluminum layer of the lower box, so that the material of the connection part of the temperature control component and the lower box can be the same or approximately the same, so that the temperature control component can be more stably connected to the lower box, and the difficulty of connecting the temperature control component to the lower box can be reduced; the lower box includes a box steel layer, so that the lower box has higher strength, thereby enhancing the bearing capacity of the lower box, and also facilitating the lower box to better protect the battery cells and other structures inside it; the temperature control component includes a temperature control aluminum layer to reduce the weight of the temperature control component and improve the heat exchange capacity of the temperature control component.

[0010] In some embodiments, the lower box includes a bottom plate and a receiving cavity formed on one side of the bottom plate, the bottom plate includes a bottom plate steel layer and a bottom plate aluminum layer, and the bottom plate aluminum layer at least partially covers the bottom plate steel layer;

[0011] The box body steel layer includes a bottom plate steel layer, the box body aluminum layer includes a bottom plate aluminum layer, and the temperature control aluminum layer is welded to the bottom plate aluminum layer.

[0012] The technical solution of this embodiment provides some specific structures of the lower box body, so that the lower box body includes a bottom plate, and a receiving cavity is formed on one side of the bottom plate to accommodate the battery cell; the bottom plate includes a bottom plate steel layer so that the bottom plate has higher strength, thereby enhancing the bearing capacity of the bottom plate; the bottom plate includes a bottom plate aluminum layer to facilitate the connection of the temperature control component to the bottom plate.

[0013] In some embodiments, the temperature control assembly includes a flow channel connected to the aluminum layer of the bottom plate, and a flow channel is formed in the flow channel tube.

[0014] The technical solution of this embodiment provides some specific structures of the temperature control component, so that the temperature control component includes a flow channel tube and is connected to the base plate, and at the same time, the flow channel is formed in the flow channel tube to facilitate the flow of heat exchange medium in the flow channel of the temperature control component.

[0015] In some embodiments, the bottom plate aluminum layer is disposed on the side of the bottom plate steel layer facing the accommodating cavity, and the bottom plate is provided with a first groove facing away from the accommodating cavity, and at least part of the flow channel tube is accommodated in the first groove.

[0016] In the technical solution of this embodiment, the flow tube is placed in the accommodating cavity so that the flow tube can better exchange heat with the accommodating cavity; a first groove is provided on the bottom plate, and at least part of the flow tube is placed in the first groove to reduce the space occupied by the flow tube in the accommodating cavity.

[0017] In some embodiments, the surface of the flow conduit facing the accommodating cavity is flush with the surface of the bottom plate facing the accommodating cavity.

[0018] In the technical solution of this embodiment, the surface of the flow tube facing the accommodating cavity is the surface of the flow tube facing the inside of the box, and the surface of the plate facing the accommodating cavity is the surface of the plate facing the inside of the box. Making the surface of the flow tube facing the accommodating cavity flush with the surface of the plate facing the accommodating cavity can further reduce the space occupied by the flow tube inside the box, and at the same time, it is also convenient for the bottom plate to carry the battery cells and to arrange the battery cells on the bottom plate.

[0019] In some embodiments, the bottom plate aluminum layer is disposed on a side of the bottom plate steel layer facing away from the accommodating cavity.

[0020] The technical solution of this embodiment provides other specific structures of the bottom plate, and the bottom plate aluminum layer is arranged on the side of the bottom plate steel layer away from the accommodating cavity, so that the temperature control component is outside the accommodating cavity, thereby reducing the space occupied by the temperature control component inside the box.

[0021] In some embodiments, the flow channel tube includes a structural aluminum layer, and the temperature control aluminum layer includes a structural aluminum layer, and the structural aluminum layer is brazed to the base plate aluminum layer.

[0022] The technical solution of this embodiment provides some connection methods between the structural aluminum layer and the bottom plate aluminum layer, so that the structural aluminum layer is brazed to the bottom plate aluminum layer, so that the connection strength between the structural aluminum layer and the bottom plate aluminum layer is higher and the sealing performance is better. At the same time, it saves structures such as fasteners, reduces the overall weight of the box, reduces the connection difficulty and simplifies the connection process.

[0023] In some embodiments, the lower box body further includes side beams, and the bottom plate is connected to the side beams and forms a receiving cavity with the side beams.

[0024] The technical solution of this embodiment provides some specific structures of the lower box body, so that the lower box body includes side beams, and the bottom plate is connected to the side beams, so that the bottom plate and the side beams can form a accommodating cavity for accommodating battery cells. At the same time, the setting of the side beams can further increase the strength of the lower box body.

[0025] In some embodiments, the side beam includes a side beam steel layer connected to a bottom plate steel layer.

[0026] The technical solution of this embodiment provides some specific structures of the side beams, so that the side beams include side beam steel layers, so that the bottom plate can be connected to the side beam steel layers through the bottom plate steel layers, thereby enabling the bottom plate to be more stably connected to the side beams.

[0027] In some embodiments, the bottom plate steel layer includes a main body and an edge portion arranged around the main body, the bottom plate aluminum layer covers at least a portion of the main body and exposes the edge portion, and the edge portion is connected to the side beam steel layer.

[0028] Because the bottom plate includes a bottom plate steel layer and a bottom plate aluminum layer, the technical solution of this embodiment provides some specific structures for connecting the bottom plate steel layer with the side beam steel layer, so that the bottom plate steel layer includes a main body and an edge portion arranged on the side of the main body, and the bottom plate aluminum layer only covers the main body and exposes the edge portion, so that the bottom plate steel layer is connected to the side beam steel layer at the edge portion; because the melting point of aluminum is lower than that of steel, making the area of ​​the bottom plate aluminum layer smaller than the area of ​​the bottom plate steel layer and exposing the edge portion can reduce the damage to the bottom plate aluminum layer when the bottom plate steel layer is connected to the side beam steel layer, and can also reduce the negative impact of the bottom plate aluminum layer on the connection between the bottom plate steel layer and the side beam steel layer.

[0029] In some embodiments, the bottom plate steel layer includes a main body and an edge portion arranged on the periphery of the main body, the edge portion is bent relative to the main body in the direction of the bottom plate aluminum layer, and the side of the edge portion facing away from the bottom plate aluminum layer is connected to the side beam steel layer.

[0030] Because the bottom plate includes a bottom plate steel layer and a bottom plate aluminum layer, the technical solution of this embodiment provides a specific structure in which other bottom plate steel layers are connected to the side beam steel layers, so that the bottom plate steel layer includes a main body and an edge portion arranged on the side of the main body, and the edge portion can be bent and cover part of the main body, and the bent edge portion can also be opposite to the side beam and connected to the side beam, so that the bottom plate steel layer can be connected to the side beam steel layer; at the same time, the bent edge portion can also make the part of the bottom plate aluminum layer close to the edge portion be on the side of the bottom plate steel layer away from the side beam, so as to reduce the negative impact of the bottom plate aluminum layer on the connection between the bottom plate steel layer and the side beam steel layer, and can also play a role in protecting the bottom plate aluminum layer.

[0031] In some embodiments, the edge portion is perpendicular to the main body portion, or the edge portion is folded onto the main body portion.

[0032] The technical solution of this embodiment provides a variety of ways to bend the edge portion, so that the edge portion can be perpendicular to the main body and connected to the side beam, or can be folded on the main body and connected to the side beam, so that the staff can choose the bending method according to the actual working conditions, thereby increasing the adaptability of the box structure.

[0033] In some embodiments, the side beam further includes a side beam aluminum layer covering at least a portion of the side beam steel layer.

[0034] The technical solution of this embodiment provides the structure of other side beams, so that the side beams also include a side beam aluminum layer that covers at least part of the side beam steel layer, so as to further enhance the strength of the side beams and facilitate the connection of the side beams with the temperature control components or other aluminum materials of the structure. At the same time, the side beam aluminum layer can also reduce the corrosion of the side beam steel layer that may be exposed to the external environment.

[0035] In some embodiments, the edge portion is welded to the edge beam steel layer.

[0036] The technical solution of this embodiment provides some connection methods between the edge portion and the side beam steel layer, so that the edge portion is welded to the side beam steel layer, so that the connection strength between the edge portion and the side beam steel layer is higher and the sealing performance is better. At the same time, it saves structures such as fasteners, reduces the overall weight of the box, reduces the connection difficulty and simplifies the connection process.

[0037] In some embodiments, the lower box body further includes a reinforcement beam, which is accommodated in the accommodating cavity and is a steel beam;

[0038] The bottom plate steel layer is connected to the reinforcement beam.

[0039] In the technical solution of this embodiment, the lower box body includes a reinforcing beam, which can improve the strength of the lower box body and suppress the expansion of the lower box body; connecting the bottom plate steel layer with the reinforcing beam can enhance the stability of the connection and facilitate flexible selection of different connection methods such as welding and screwing.

[0040] In some embodiments, the thickness of the bottom plate steel layer is greater than the thickness of the bottom plate aluminum layer.

[0041] In the technical solution of this embodiment, the thickness of the bottom plate steel layer is greater than the thickness of the bottom plate aluminum layer. Since the main function of the bottom plate steel layer is to increase the strength of the bottom plate, the thickness of the bottom plate steel layer is made thicker to better increase the strength of the bottom plate; and since the main function of the bottom plate aluminum layer is to facilitate the connection of the flow channel tube, the thickness of the bottom plate aluminum layer is made thinner, so that the bottom plate aluminum layer can be connected to the flow channel tube and the space occupied by the bottom plate aluminum layer can be reduced, thereby reducing the overall thickness of the plate body.

[0042] In some embodiments, the thickness of the bottom plate steel layer ranges from 0.5 mm to 2.0 mm, and the thickness of the bottom plate aluminum layer ranges from 0.05 mm to 1.0 mm.

[0043] The technical solution of this embodiment provides some thickness ranges for the bottom plate steel layer and the bottom plate aluminum layer, so that the thickness of the bottom plate steel layer can be greater than the thickness of the bottom plate aluminum layer, thereby increasing the strength of the temperature control component; at the same time, it also enables the bottom plate aluminum layer to be connected to the flow channel tube, and can also reduce the space occupied by the bottom plate aluminum layer, thereby reducing the overall thickness of the plate body.

[0044] In some embodiments, a through hole is opened on the bottom plate, and the temperature control component covers the through hole.

[0045] The technical solution of this embodiment provides other specific structures of the lower box, with through holes opened on the bottom plate, and the temperature control component covered by the through holes, which can not only enable the temperature control component to better exchange heat with the accommodating cavity, but also accommodate part of the temperature control component through the through holes to reduce the space occupied by the temperature control component in the accommodating cavity.

[0046] In some embodiments, the bottom plate aluminum layer is disposed on the side of the bottom plate steel layer facing the accommodating cavity, and the temperature control component is disposed on the side of the bottom plate facing the accommodating cavity.

[0047] In the technical solution of this embodiment, the bottom plate aluminum layer is arranged on the side of the bottom plate steel layer facing the accommodating cavity, so that the temperature control component can be placed in the accommodating cavity, thereby reducing the height of the temperature control component protruding from the bottom plate, thereby reducing the temperature control component's demand for external space, and also playing a role in protecting part of the temperature control component.

[0048] In some embodiments, the lower box body includes a side beam, and the side beam includes a side beam steel layer and a side beam aluminum layer covering at least a portion of the side beam steel layer;

[0049] The box body steel layer includes the side beam steel layer, the box body aluminum layer includes the side beam aluminum layer, and the temperature control aluminum layer is welded to the side beam aluminum layer.

[0050] The technical solution of this embodiment provides other specific structures of the lower box body, so that the lower box body includes side beams, and the temperature control component is connected to the side beams, so that the temperature control component and the side beams can form a accommodating cavity for accommodating battery cells. Even if the temperature control component serves as the bottom structure of the lower box body and replaces the bottom plate, the box body does not need to accommodate the temperature control component, reducing the volume required for the box body, thereby reducing the volume of the box body, reducing the space occupied by the box body, improving the integration level of the box body, and reducing the overall weight of the box body.

[0051] In some embodiments, the temperature control assembly includes a first plate and a second plate, a flow channel is formed between the first plate and the second plate, the first plate includes a first aluminum layer, the second plate includes a second aluminum layer, and the first aluminum layer is connected to the second aluminum layer;

[0052] The temperature-controlled aluminum layer includes a first aluminum layer or a second aluminum layer, and the first aluminum layer or the second aluminum layer is welded to the side beam aluminum layer.

[0053] The technical solution of this embodiment provides some specific structures of the temperature control component, so that the temperature control component includes a first plate body and a second plate body, and the first plate body is connected to the second plate body, so that a flow channel can be formed between the first plate body and the second plate body; the first plate body includes a first aluminum layer, and the second plate body includes a second aluminum layer, so that the first plate body is connected to the second plate body, and the first aluminum layer or the second aluminum layer is connected to the side beam aluminum layer.

[0054] In some embodiments, the first plate body is provided with a second groove in a direction away from the side beam, and the second plate body is provided on a side of the first plate body facing the side beam and covers the second groove.

[0055] The technical solution of this embodiment provides some specific structures of the temperature control components, so that a second groove is formed on the first plate body, and the second plate body covers the second groove, so that the second plate body can cooperate with the second groove to form a flow channel, thereby facilitating the flow of heat exchange medium in the flow channel.

[0056] In some embodiments, the surface of the second plate facing away from the first plate is a plane.

[0057] In the technical solution of this embodiment, the surface of the second plate facing away from the first plate is the surface of the second plate facing the interior of the box. Making this surface flat can reduce the space occupied by the second plate inside the box and facilitate the arrangement of structures such as battery cells in the box.

[0058] In some embodiments, the first plate further comprises a first steel layer, the first steel layer being disposed on a side of the first aluminum layer facing away from the second aluminum layer; and / or

[0059] The second plate body further includes a second steel layer, which is arranged on a side of the second aluminum layer facing away from the first aluminum layer.

[0060] The technical solution of this embodiment provides some specific structures of the first plate and the second plate, so that the first plate also includes a first steel layer to enhance the strength of the first plate, thereby enhancing the strength of the temperature control component, so that the temperature control component can better carry the battery cell; the second plate also includes a second steel layer to enhance the strength of the second plate, thereby enhancing the strength of the temperature control component, so that the temperature control component can better carry the battery cell.

[0061] In a second aspect, some embodiments of the present application further provide a battery, comprising the housing provided by some embodiments of the first aspect.

[0062] In a third aspect, some embodiments of the present application further provide an electrical device, comprising the battery provided in some embodiments of the second aspect.

[0063] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0065] FIG1 is a schematic diagram of the structure of an electrical device provided in some embodiments of the present application.

[0066] FIG2 is a schematic diagram of an explosion of a battery provided in some embodiments of the present application.

[0067] FIG3 is a schematic diagram of an explosion of a battery cell provided in some embodiments of the present application.

[0068] FIG4 is a perspective schematic diagram of a lower box provided in some embodiments of the present application.

[0069] FIG5 is a schematic top view of the lower box provided in some embodiments of the present application.

[0070] FIG6 is a schematic cross-sectional view of the section AA in FIG5 provided in some embodiments of the present application.

[0071] FIG7 is a partial enlarged schematic diagram of point B in FIG6 provided in some embodiments of the present application.

[0072] FIG8 is a partially enlarged schematic diagram of point B in FIG6 provided in some other embodiments of the present application.

[0073] FIG9 is a partially enlarged schematic diagram of point C in FIG6 provided in some embodiments of the present application.

[0074] FIG10 is a partially enlarged schematic diagram of point D in FIG9 provided in some embodiments of the present application.

[0075] FIG11 is a partially enlarged schematic diagram of point D in FIG9 provided in some other embodiments of the present application.

[0076] FIG12 is a partially enlarged schematic diagram of point D in FIG9 provided in some other embodiments of the present application.

[0077] FIG13 is a partially enlarged schematic diagram of point D in FIG9 provided in some other embodiments of the present application.

[0078] FIG14 is a partially enlarged schematic diagram of point E in FIG10 provided in some embodiments of the present application.

[0079] FIG15 is a partially enlarged schematic diagram of point C in FIG6 provided in some other embodiments of the present application.

[0080] FIG16 is a partially enlarged schematic diagram of point F in FIG15 provided in some other embodiments of the present application.

[0081] FIG17 is a partially enlarged schematic diagram of point F in FIG15 provided in some other embodiments of the present application.

[0082] FIG18 is a three-dimensional schematic diagram of the lower box provided in other embodiments of the present application.

[0083] FIG19 is a schematic top view of the lower box provided in some other embodiments of the present application.

[0084] FIG20 is a schematic partial cross-sectional view of point GG in FIG19 provided in some embodiments of the present application.

[0085] The meanings of the marks in the figure are: 100, electrical equipment; 10, motor; 20, controller; 200, battery; 300, battery cell; 31, end cover; 32, shell; 33, electrode assembly; 400, box body; 40, lower box body; 401, accommodating cavity; 41, side beam; 411, side beam steel layer; 412, side beam aluminum layer; 42, bottom plate; 421, bottom plate steel layer; 4211, main body; 4212, edge; 422, bottom plate aluminum layer; 423, first groove; 424, through hole; 50, temperature control component; 51, flow channel tube; 52, first plate body; 521, first steel layer; 522, first aluminum layer; 523, second groove; 53, second plate body; 531, second aluminum layer; 532, second steel layer; 60, reinforcement beam; 70, upper box body. Modes for Carrying Out the Invention

[0086] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0087] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0088] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0089] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0090] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0091] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0092] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0093] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0094] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0095] In a battery, the casing is an important component. The casing is used to accommodate battery cells, temperature control components (such as water cooling plates, etc.), control devices and other structures and devices, and to provide protection for the structures and devices contained therein.

[0096] The temperature control component is also an important component in the battery. It is mainly used to control the temperature of the battery. The battery is prone to temperature rise during use, and excessively high battery temperature can easily lead to thermal runaway, which in turn poses the risk of fire or even explosion. The setting of the temperature control component can alleviate the situation where the battery temperature is too high, reduce the risk of battery fire, and improve the safety performance of the battery.

[0097] At present, the temperature control component is usually set in the box and installed on the box through structural parts or a large number of bolts. At the same time, a sealing structure (such as a sealing ring) is required between the temperature control component and the box. This installation method is cumbersome to operate, has low installation efficiency, and easily increases the overall weight of the battery.

[0098] To simplify the installation of the temperature control assembly and reduce the overall weight of the battery, the temperature control assembly can be fixed to the housing through welding, gluing, or other methods, eliminating the need for structural components or bolts. However, the temperature control assembly and the housing are made of different materials. Because the temperature control assembly's primary function is to exchange heat to control temperature, and the weight of the temperature control assembly should be minimal to reduce the overall weight of the battery, the temperature control assembly is typically made of lightweight materials such as aluminum. Furthermore, because the housing's primary function is to support and protect the battery cells and other structures, the housing is typically made of steel or other materials. When the temperature control assembly and housing are connected, the different materials deform differently when the external environment changes (e.g., temperature increases or decreases), resulting in gaps at the connection. This requires the installation of sealing components such as sealing rings, which complicates the installation process and increases the overall weight of the battery. Furthermore, the different deformations of the different materials also exert additional force on the connection between the temperature control assembly and the housing, increasing the load-bearing capacity of the connection and easily causing deformation or breakage.

[0099] Based on the above considerations, to simplify the temperature control assembly installation process and reduce the overall weight of the battery, the embodiments of this application design a housing. The housing is made of steel and aluminum, and the temperature control assembly is made of aluminum. This allows the connection between the temperature control assembly and the housing to be made of the same material. For example, if the housing includes steel and aluminum layers, and the temperature control assembly includes an aluminum layer, then the connection between the temperature control assembly and the housing can be made of aluminum.

[0100] In such a box, the connection parts of the temperature control component and the box are made of the same material. When the external environment changes, the temperature control component and the box can change synchronously at the connection parts, thereby reducing the appearance of gaps, saving sealing components, saving the installation process of sealing components, simplifying the installation process, and reducing the overall weight of the battery; at the same time, it can also reduce the deformation and breakage of the connection parts between the temperature control component and the box, thereby helping to improve the connection strength between the temperature control component and the box.

[0101] The box disclosed in the embodiments of the present application can be used for electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0102] For the convenience of description, the following embodiments are described by taking an electric device 100 of an embodiment of the present application as a vehicle as an example.

[0103] Referring to Figure 1, Figure 1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 200 is provided inside the vehicle, and the battery 200 can be provided at the bottom, head or tail of the vehicle. The battery 200 can be used to power the vehicle. For example, the battery 200 can serve as an operating power source for the vehicle. The vehicle may also include a controller 20 and a motor 10. The controller 20 is used to control the battery 200 to power the motor 10, for example, for starting, navigating and operating power requirements during driving of the vehicle.

[0104] In some embodiments of the present application, the battery 200 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0105] Referring to Figure 2, Figure 2 is an exploded view of a battery 200 provided in some embodiments of the present application. The battery 200 includes a housing 400 and battery cells 300, with the battery cells 300 housed within the housing 400. The housing 400 is used to provide a storage space for the battery cells 300 and can have various structures. In some embodiments, the housing 400 can include an upper housing 70 and a lower housing 40. The upper housing 70 and the lower housing 40 overlap each other, and the upper and lower housings 70 and 40 together define a storage space for the battery cells 300. The lower housing 40 can be a hollow structure with one end open, and the upper housing 70 can be a plate-like structure. The upper housing 70 overlaps the open side of the lower housing 40, so that the upper and lower housings 70 and 40 together define a storage space. Alternatively, both the upper and lower housings 70 and 40 can be hollow structures with one end open, with the open side of the upper housing 70 overlapping the open side of the lower housing 40. Of course, the box body 400 formed by the upper box body 70 and the lower box body 40 can be in various shapes, such as a cylinder, a cuboid, etc.

[0106] In the battery 200, there may be multiple battery cells 300, and the multiple battery cells 300 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 300. The multiple battery cells 300 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 200 structure may be housed within the housing 400. Of course, the battery 200 may also be a battery 200 module formed by first connecting multiple battery cells 300 in series, in parallel, or in a hybrid connection, and then the multiple battery 200 modules may be connected in series, in parallel, or in a hybrid connection to form a complete battery 200 structure and housed within the housing 400. The battery 200 may also include other structures, for example, the battery 200 may also include a busbar component for electrically connecting the multiple battery cells 300.

[0107] Each battery cell 300 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 300 may be cylindrical, flat, rectangular, or in other shapes.

[0108] Referring to Figure 3, Figure 3 is a schematic diagram of the exploded structure of a battery cell 300 provided in some embodiments of the present application. A battery cell 300 is the smallest unit that makes up a battery 200. As shown, a battery cell 300 includes an end cap 31, a housing 32, an electrode assembly 33, and other functional components.

[0109] The end cap 31 is a component that covers the opening of the housing 32 to isolate the internal environment of the battery cell 300 from the external environment. The shape of the end cap 31 can be adapted to the shape of the housing 32 to fit the housing 32. Optionally, the end cap 31 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 31 from deforming when subjected to compression or collision, thereby enhancing the structural strength and safety of the battery cell 300. Functional components such as electrode terminals can be provided on the end cap 31. The electrode terminals can be used to electrically connect to the electrode assembly 33 to output or input electrical energy to or from the battery cell 300. In some embodiments, the end cap 31 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 300 reaches a threshold. The end cap 31 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any specific limitations on this. In some embodiments, an insulating member may be provided inside the end cap 31 to isolate the electrical connection components in the housing 32 from the end cap 31 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0110] The housing 32 is a component that cooperates with the end cap 31 to form the internal environment of the battery cell 300. This internal environment can be used to accommodate the electrode assembly 33, electrolyte, and other components. The housing 32 and end cap 31 can be separate components. An opening can be provided in the housing 32, and the end cap 31 is placed over the opening to form the internal environment of the battery cell 300. Alternatively, the end cap 31 and housing 32 can be integrated. Specifically, the end cap 31 and housing 32 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 32 needs to be enclosed, the end cap 31 is placed over the housing 32. The housing 32 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 32 can be determined based on the specific shape and size of the electrode assembly 33. The housing 32 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, and aluminum alloys, and this embodiment of the present application does not impose any particular limitations on this.

[0111] The electrode assembly 33 is a component in the battery cell 300 where electrochemical reactions occur. One or more electrode assemblies 33 may be contained in the housing 32. The electrode assembly 33 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 33, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 200, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0112] On the first aspect, some embodiments of the present application provide a box body 400, referring to Figures 4, 5, and 18, wherein Figure 4 is a three-dimensional schematic diagram of the lower box body 40 provided in some embodiments of the present application, Figure 5 is a top view schematic diagram of the lower box body 40 provided in some embodiments of the present application, and Figure 18 is an exploded schematic diagram of the lower box body 40 provided in some embodiments of the present application.

[0113] In some embodiments of the present application, the box body 400 is used to accommodate the battery cell 300, and the box body 400 includes: a lower box body 40 and a temperature control component 50; wherein, the lower box body 40 includes a box body steel layer and a box body aluminum layer; the temperature control component 50 is connected to the lower box body 40, the temperature control component 50 includes a temperature control aluminum layer, and the temperature control aluminum layer is welded to the box body aluminum layer.

[0114] The lower box body 40 refers to the structure in the box body 400 that is used to cooperate with the upper box body 70 to form a space for accommodating the battery cell 300; the shape of the lower box body 40 can be cylindrical, prismatic or other shapes; the material of the lower box body 40 can include steel, aluminum or other materials. Since steel is an iron-carbon alloy, the material of the lower box body 40 can include iron, carbon, aluminum or other materials.

[0115] The lower box body 40 can be a hollow structure with one end open. In this case, the lower box body 40 can cooperate with the upper box body 70 to form a storage space, which can accommodate the battery cell 300 and be separated from the outside world; the lower box body 40 can also be a structure with both ends open. In this case, the lower box body 40 can cooperate with the upper box body 70 and the bottom structure to form a storage space, which can accommodate the battery cell 300 and be separated from the outside world.

[0116] The temperature control component 50 refers to a structure in the box body 400 for controlling the internal temperature of the box body 400; because the battery cells 300 in the box body 400 are prone to generate a large amount of heat during use, the temperature control component 50 is mainly used to reduce the temperature inside the box body 400, but under certain working conditions, the temperature control component 50 can also play a role in increasing the internal temperature of the box body 400; the temperature control component 50 can exchange heat with the storage space of the box body 400 through a flowing heat exchange medium, and the heat exchange medium can be a gas, liquid or other medium.

[0117] The temperature control assembly 50 is connected to the lower case 40. The temperature control assembly 50 can be located either within the storage space of the case 400 or outside the case 400. In some embodiments, the temperature control assembly 50 is located within the storage space of the case 400 and connected to the lower case 40; in other embodiments, the temperature control assembly 50 is located outside the lower case 40 and connected to the lower case 40, in which case the temperature control assembly 50 does not occupy the internal space of the lower case 40; in still other embodiments, the temperature control assembly 50 can also serve as the bottom structure of the lower case 40, in which case the lower case 40 can be a structure with both ends open.

[0118] The box steel layer refers to the layered structure in the lower box 40 whose main material is steel. At this time, the box steel layer mainly has the characteristics of steel. For example, the material of the box steel layer can include only steel (carbon and iron), or it can include other materials and make the specific gravity of steel greater than the specific gravity of other materials.

[0119] The box body aluminum layer refers to a layered structure in which the main material of the lower box body 40 is aluminum. At this time, the box body aluminum layer mainly has the characteristics of aluminum. For example, the material of the box body aluminum layer can include only aluminum, or it can include other materials and make the specific gravity of aluminum greater than the specific gravity of other materials.

[0120] The lower box body 40 includes a box body steel layer and a box body aluminum layer. Since the main function of the lower box body 40 is to provide protection and support for structures such as the battery cells 300 in the accommodating space, the strength of the lower box body 40 should be relatively high. The lower box body 40 including the box body steel layer can enable the lower box body 40 to have a relatively high strength, so as to provide protection for structures such as the battery cells 300 in the accommodating space. Since the temperature control component 50 needs to be connected to the lower box body 40, the lower box body 40 includes a box body aluminum layer so that the material of the connection between the temperature control component 50 and the lower box body 40 can be the same, thereby improving the connection strength of the connection between the temperature control component 50 and the lower box body 40, and also facilitating the connection of the temperature control component 50 to the lower box body 40. At the same time, since aluminum has good corrosion resistance, the box body aluminum layer can also reduce the external corrosion that the box body steel layer may be subjected to.

[0121] The temperature control aluminum layer refers to a layered structure in which the main material of the temperature control component 50 is aluminum. At this time, the temperature control aluminum layer mainly has the characteristics of aluminum. For example, the material of the temperature control aluminum layer can include only aluminum, or it can include other materials and make the specific gravity of aluminum greater than the specific gravity of other materials.

[0122] Since the temperature control component 50 is mainly used for heat exchange with the accommodation space, the temperature control component 50 has a lower strength requirement. Therefore, the temperature control component 50 includes a temperature control aluminum layer, which can make the temperature control component 50 have a stronger thermal conductivity, and at the same time can also reduce the weight of the temperature control component 50, thereby reducing the overall weight of the box 400; at the same time, aluminum also has good corrosion resistance. For example, a layer of oxide film can be formed on the surface of aluminum to reduce the corrosion of the heat exchange medium on the temperature control component 50.

[0123] The temperature-controlling aluminum layer is welded to the box body aluminum layer. For example, the temperature-controlling aluminum layer can be welded to the box body aluminum layer by welding processes such as pressure welding, brazing or fusion welding.

[0124] Since the main materials of the temperature control aluminum layer and the box aluminum layer are aluminum, the two have similar melting points, so welding can make the connection between the temperature control aluminum layer and the box aluminum layer have higher mechanical strength. Compared with connecting through bolts and other structures, welding operation is simpler and lighter.

[0125] In this embodiment, the temperature control component 50 is connected to the aluminum layer of the lower box body 40 through the temperature control aluminum layer, so that the material of the temperature control component 50 and the lower box body 40 at the connecting portion is the same or substantially the same, so that the temperature control component 50 can be more stably connected to the lower box body 40. When the external environment changes (for example, temperature rises or falls), the temperature control component 50 and the lower box body 40 at the connecting portion will both deform. Since the material of the temperature control component 50 and the lower box body 40 at the connecting portion is the same or substantially the same, the deformation of the connecting portion can also be the same or substantially the same, thereby reducing the possible impact of different material deformation on the connecting portion. The additional load caused reduces the risk of deformation, breakage, etc. at the connection between the temperature control component 50 and the lower box body 40, and increases the stability of the connection; because the deformation of the temperature control component 50 and the lower box body 40 at the connection part can also be the same or approximately the same, it can also reduce the appearance of gaps that may be caused by material deformation, so as to improve the connection sealing performance between the temperature control component 50 and the lower box body 40, and can save additional sealing structures (such as sealing rings, etc.), thereby further reducing the overall weight of the box body 400; the temperature control component 50 and the lower box body 40 having the same or approximately the same material can also reduce the difficulty of welding.

[0126] According to some embodiments of the present application, referring to Figures 5 to 8, the lower box body 40 includes a bottom plate 42 and a accommodating cavity 401 formed on one side of the bottom plate 42, the bottom plate 42 includes a bottom plate steel layer 421 and a bottom plate aluminum layer 422, and the bottom plate aluminum layer 422 at least covers a portion of the bottom plate steel layer 421.

[0127] The bottom plate 42 refers to a component in the lower box 40 used to support structures such as the battery cells 300. The battery cells 300 and other structures can be installed on the bottom plate 42 to be accommodated in the box 400. The bottom plate 42 is also used to provide protection for the battery cells 300 and other structures in the box 400. The shape of the bottom plate 42 can be square, round or other shapes.

[0128] The bottom plate steel layer 421 refers to a layered structure in which the main material of the bottom plate 42 is steel, and the bottom plate aluminum layer 422 refers to a layered structure in which the main material of the bottom plate 42 is aluminum; the bottom plate aluminum layer 422 is arranged on the bottom plate steel layer 421, and the bottom plate steel layer 421 and the bottom plate aluminum layer 422 can be compounded to form the bottom plate 42; the bottom plate steel layer 421 and the bottom plate aluminum layer 422 can be compounded to form the bottom plate 42 through a rolling process, or can be compounded through explosive compounding, adhesive compounding or other methods; it can be understood that in addition to the bottom plate steel layer 421 and the bottom plate aluminum layer 422, the bottom plate 42 can also include a layered structure of other materials and be compounded with the bottom plate aluminum layer 422 and the bottom plate steel layer 421.

[0129] When the lower box body 40 includes the bottom plate 42 , the box body steel layer includes the bottom plate steel layer 421 , and the box body aluminum layer includes the bottom plate aluminum layer 422 . At this time, the temperature control aluminum layer is connected to the bottom plate aluminum layer 422 .

[0130] The accommodating cavity 401 refers to the space in the lower box body 40 for accommodating the battery cell 300 or other structures. The accommodating cavity 401 can be a part of the accommodating space of the box body 400; for example, the bottom plate 42 can be formed into a basin-shaped structure by a stamping process to enclose the accommodating cavity 401; for another example, when the upper box body 70 is a hollow structure with an open end, the bottom plate 42 can be a plate-shaped structure and cooperate with the upper box body 70 to enclose the accommodating cavity 401; it can be understood that the bottom plate 42 can also cooperate with other structures or enclose the accommodating cavity 401 by other means.

[0131] The bottom plate aluminum layer 422 covers at least a portion of the bottom plate steel layer 421. Since the main function of the bottom plate aluminum layer 422 is to connect the temperature control component 50 to the bottom plate 42, the bottom plate aluminum layer 422 can cover the entire bottom plate steel layer 421, or it can cover the bottom plate steel layer 421 only at the location where the temperature control component 50 needs to be installed. For example, since the bottom plate 42 is connected to the temperature control component 50 through the bottom plate aluminum layer 422, the bottom plate aluminum layer 422 covers the bottom plate steel layer 421 at least at the position where the bottom plate 42 is relative to the temperature control component 50. The bottom plate aluminum layer 422 can also cover more positions of the bottom plate steel layer 421 to protect the bottom plate steel layer 421 and enhance the overall strength of the bottom plate 42, while also facilitating the connection of other aluminum structures to the bottom plate 42.

[0132] The bottom plate 42 includes a bottom plate steel layer 421 to increase the strength of the bottom plate 42, so that the bottom plate 42 can better provide support for structures such as the battery cell 300 and the temperature control component 50, while also better protecting the battery cell 300 and other structures in the accommodating cavity 401; the bottom plate 42 includes a bottom plate aluminum layer 422 to facilitate the connection of the flow channel tube 51 to the bottom plate 42.

[0133] In this embodiment, the lower box body 40 includes a bottom plate 42, and a receiving cavity 401 is formed on one side of the bottom plate 42 to accommodate the battery cell 300; the bottom plate 42 includes a bottom plate steel layer 421, so that the bottom plate 42 has higher strength, thereby enhancing the bearing capacity of the bottom plate 42; the bottom plate 42 includes a bottom plate aluminum layer 422, so that the temperature control component 50 is connected to the bottom plate 42.

[0134] 7 and 8 , in some embodiments, the temperature control assembly 50 includes a flow channel tube 51 connected to the bottom plate aluminum layer 422 ; a flow channel is formed in the flow channel tube 51 .

[0135] The flow tube 51 refers to the structure constituting the temperature control component 50 ; the shape of the flow tube 51 can be square, circular or other shapes.

[0136] The flow channel refers to a channel structure in the temperature control component 50 for the heat exchange medium to flow; the shape of the flow channel can be circular, square or other shapes.

[0137] Because the temperature control component 50 includes a temperature control aluminum layer, the flow tube 51 can be bent through the temperature control aluminum layer so that the flow tube 51 is connected to the bottom plate aluminum layer 422, so that the material of the connecting portion of the flow tube 51 and the bottom plate 42 is the same or approximately the same, which reduces the difficulty of connection. At the same time, it can also make the flow tube 51 and the bottom plate 42 have the same or approximately the same deformation when the external environment changes, reducing the difference in deformation between the flow tube 51 and the bottom plate 42, thereby reducing the additional load on the connecting portion of the flow tube 51 and the bottom plate 42 due to the deformation of the two, thereby enhancing the stability of the connection.

[0138] In this embodiment, the temperature control component 50 includes a flow channel tube 51 connected to the bottom plate 42 , and a flow channel is formed in the flow channel tube 51 to facilitate the flow of heat exchange medium in the flow channel of the temperature control component 50 .

[0139] Referring to Figure 8, in some embodiments, the bottom plate aluminum layer 422 is arranged on the side of the bottom plate steel layer 421 facing the accommodating cavity 401, and the bottom plate 42 is recessed with a first groove 423 facing away from the accommodating cavity 401, and at least part of the flow channel tube 51 is accommodated in the first groove 423.

[0140] The first groove 423 refers to a groove structure recessed on the bottom plate 42 in a direction away from the accommodating cavity 401. The opening of the first groove 423 faces the accommodating cavity 401 to accommodate the flow channel tube 51. The first groove 423 can be a semicircular groove, a rectangular groove, a trapezoidal groove or a groove of other shapes.

[0141] Because the flow tube 51 is connected to the bottom plate aluminum layer 422, the bottom plate aluminum layer 422 is arranged on the side of the bottom plate steel layer 421 facing the accommodating cavity 401, that is, the flow tube 51 is connected to the side of the bottom plate 42 facing the accommodating cavity 401. At this time, the flow tube 51 is accommodated in the accommodating cavity 401, so that the temperature control component 50 can better exchange heat with the battery cell 300 in the accommodating cavity 401.

[0142] At least a portion of the flow tube 51 is accommodated in the first groove 423, which means that at least a portion of the flow tube 51 is accommodated in the first groove 423. For example, the flow tube 51 may be only partially accommodated in the first groove 423, while partially exposed outside the first groove 423, or the flow tube 51 may be completely accommodated in the first groove 423.

[0143] Because the flow tube 51 is arranged on the side of the bottom plate 42 facing the accommodating cavity 401, the flow tube 51 will occupy the space of the accommodating cavity 401 and affect the installation of the battery cell 300. Providing a first groove 423 to accommodate the flow tube 51 can reduce the height of the flow tube 51 protruding from the bottom plate 42, thereby reducing the space occupied by the flow tube 51 in the accommodating cavity 401 and facilitating the arrangement of the battery cell 300.

[0144] In this embodiment, the flow conduit 51 is placed in the accommodating cavity 401 so that the flow conduit 51 can better exchange heat with the accommodating cavity 401; a first groove 423 is provided on the bottom plate 42, and at least part of the flow conduit 51 is accommodated in the first groove 423 to reduce the space occupied by the flow conduit 51 in the accommodating cavity 401.

[0145] 8 , in some embodiments, the surface of the flow conduit 51 facing the accommodating cavity 401 is flush with the surface of the bottom plate 42 facing the accommodating cavity 401 .

[0146] The surface of the flow tube 51 facing the accommodating cavity 401 is flush with the surface of the bottom plate 42 facing the accommodating cavity 401, which means that the flow tube 51 is completely accommodated in the first groove 423. This setting allows the side of the temperature control component 50 facing the accommodating cavity 401 to be relatively flat, thereby reducing the space occupied by the temperature control component 50 in the accommodating cavity 401. At the same time, it can also reduce the restrictions of the temperature control component 50 on the installation of the battery cell 300, making it easier for the battery cell 300 to be installed and arranged in the required manner.

[0147] At the same time, this arrangement also prevents the protrusion height of the first groove 423 on the side of the plate away from the flow channel tube 51 from being too high, thereby reducing the external space occupied by the temperature control component 50 and facilitating the installation of the box 400 at the desired position.

[0148] 7 , in some embodiments, the bottom plate aluminum layer 422 is disposed on a side of the bottom plate steel layer 421 facing away from the accommodating cavity 401 .

[0149] Because the flow tube 51 is connected to the bottom plate aluminum layer 422, the bottom plate aluminum layer 422 is arranged on the side of the bottom plate steel layer 421 away from the accommodating cavity 401, that is, the flow tube 51 is connected to the side of the bottom plate 42 away from the accommodating cavity 401. At this time, the flow tube 51 is outside the accommodating cavity 401, thereby further reducing the space occupied by the flow tube 51 in the accommodating cavity 401.

[0150] In some embodiments, the flow channel tube 51 includes a structural aluminum layer, the temperature control aluminum layer includes a structural aluminum layer, and the structural aluminum layer is brazed and connected to the bottom plate aluminum layer 422 .

[0151] The structural aluminum layer refers to the layered structure in the flow channel tube 51 whose main material is aluminum. The structural aluminum layer can form a pipeline structure by bending, welding, etc.; it can be understood that in addition to the structural aluminum layer, the flow channel tube 51 can also include a layered structure of other materials and be composited with the structural aluminum layer.

[0152] When the temperature control component 50 includes the flow channel tube 51 , the temperature control aluminum layer includes a structural aluminum layer. In this case, the structural aluminum layer is connected to the bottom plate aluminum layer 422 .

[0153] Brazing has a fast heating speed, small material deformation and simple operation. The joint formed by brazing has high mechanical strength and good airtightness. The structural aluminum layer is brazed to the bottom plate aluminum layer 422, which can reduce the deformation of the structural aluminum layer and the bottom plate aluminum layer 422 during the connection process, and can also make the connection part have strong mechanical strength and good airtightness. At the same time, it can save structures such as fasteners, reduce the overall weight of the box 400, reduce the connection difficulty and simplify the connection process.

[0154] In this embodiment, the structural aluminum layer is brazed to the bottom plate aluminum layer 422, so that the connection strength between the structural aluminum layer and the bottom plate aluminum layer 422 is high and the sealing performance is good. At the same time, it saves structures such as fasteners, reduces the overall weight of the box 400, reduces the connection difficulty and simplifies the connection process.

[0155] According to some embodiments of the present application, referring to Figures 5, 6, 9 to 14, the lower box body 40 further includes a side beam 41, and the bottom plate 42 is connected to the side beam 41 and forms an accommodating cavity 401 with the side beam 41.

[0156] The side beam 41 refers to a structure in the lower box body 40 that supports and protects the peripheral sides of the box body 400; the side beam 41 can be a box beam, an I-beam or a beam body of other shapes; the cross-sectional shape of the side beam 41 can be square or other shapes; when the side beam 41 is a box beam, the side beam 41 can be formed by rolling, or by local rolling combined with arc welding, or by other methods; the material of the side beam 41 can include steel, aluminum or other materials.

[0157] The side beams 41 and the bottom plate 42 can enclose a accommodating cavity 401. In such a setting, the side beams 41 can be used to improve the overall strength of the lower box body 40, and can also be used to better protect the battery cells 300 and other structures inside the box body 400 on the side; in such a setting, the bottom plate 42 is mainly used to support the battery cells 300 and other structures in the box body 400.

[0158] The bottom plate 42 can be connected to the side beam 41 by welding, gluing, screwing or other means; the material of the side beam 41 may include steel, aluminum or other materials. Depending on the material of the connection between the side beam 41 and the bottom plate 42, the bottom plate steel layer 421 can be connected to the side beam 41, or the bottom plate aluminum layer 422 can be connected to the side beam 41.

[0159] 10 to 12 , the side beam 41 includes a side beam steel layer 411 , and the side beam steel layer 411 is connected to a bottom plate steel layer 421 .

[0160] The side beam steel layer 411 refers to a layered structure in which the main material of the side beam 41 is steel. At this time, the side beam steel layer 411 mainly has the characteristics of steel. For example, the material of the side beam steel layer 411 can include only steel (carbon and iron), or it can include other materials and make the specific gravity of steel greater than the specific gravity of other materials; when the side beam 41 is a box beam, the flat side beam steel layer 411 can be rolled to form the side beam 41.

[0161] Since the main function of the side beam 41 is to protect the battery cell 300 and other structures in the accommodating cavity 401 and provide a fixed foundation for the bottom plate 42, the strength of the side beam 41 should be relatively strong, so that the side beam 41 includes a side beam steel layer 411. Even if the main material of the side beam 41 is steel, this setting enables the side beam 41 to have a higher strength to better play a protective role.

[0162] The side beam steel layer 411 is connected to the bottom plate steel layer 421, that is, the material of the connecting portion of the side beam 41 and the bottom plate 42 is the same, which can make the bottom plate 42 more stably connected to the side beam 41. When the external environment changes, the bottom plate 42 and the side beam 41 will deform at the connecting portion. Since the material of the connecting portion of the bottom plate 42 and the side beam 41 is the same, the deformation of the bottom plate 42 and the side beam 41 at the connecting portion can also be the same or approximately the same, thereby reducing the additional load on the connecting portion caused by different material deformation, reducing the risk of deformation, fracture, etc. at the connecting portion of the bottom plate 42 and the side beam 41, increasing the stability of the connection, and enhancing the overall strength of the lower box body 40, and reducing the difficulty of connection.

[0163] The bottom plate steel layer 421 can be connected to the side beam steel layer 411 by welding, gluing, screwing, etc.; in some embodiments, the bottom plate steel layer 421 is connected to the side beam steel layer 411 by a laser welding process.

[0164] 10 , in some embodiments, the bottom plate steel layer 421 includes a main body 4211 and an edge portion 4212 disposed around the main body 4211 , the bottom plate aluminum layer 422 covers the main body 4211 and exposes the edge portion 4212 , and the edge portion 4212 is connected to the side beam steel layer 411 .

[0165] The main body 4211 refers to the central portion of the bottom plate steel layer 421, and the edge portion 4212 refers to the edge portion of the bottom plate steel layer 421. The edge portion 4212 is located on the peripheral side of the main body 4211. The main body 4211 and the edge portion 4212 may be simply two parts set on the bottom plate steel layer 421, or may be defined by structures such as notches. The main body 4211 and the edge portion 4212 may be integrally formed, or may be two independent structures connected by welding, gluing, or the like.

[0166] The bottom plate aluminum layer 422 covers the main body 4211, that is, the edge portion 4212 is not covered by the bottom plate aluminum layer 422 and can be directly opposite to the side beam 41, so that the edge portion 4212 is directly connected to the side beam steel layer 411, thereby allowing the bottom plate steel layer 421 to be connected to the side beam steel layer 411 through the edge portion 4212.

[0167] The exposed edge portion 4212 of the bottom plate aluminum layer 422 can be achieved in a variety of ways. In some embodiments, before the bottom plate steel layer 421 and the bottom plate aluminum layer 422 are compounded, the area of ​​the bottom plate aluminum layer 422 can be made smaller than the area of ​​the bottom plate steel layer 421, that is, when cutting, the area of ​​the bottom plate aluminum layer 422 can be made smaller than the area of ​​the bottom plate steel layer 421, so that the edge portion 4212 can be exposed after the bottom plate aluminum layer 422 and the bottom plate steel layer 421 are compounded; in other embodiments, the edge portion 4212 can also be exposed by peeling aluminum after the bottom plate steel layer 421 and the bottom plate aluminum layer 422 are compounded. For example, after the bottom plate steel layer 421 and the bottom plate aluminum layer 422 are compounded, the portion of the bottom plate aluminum layer 422 corresponding to the edge portion 4212 can be peeled off to expose the edge portion 4212. The peeling can be performed by laser peeling, cutter shear peeling or other methods; it can be understood that the edge portion 4212 can also be exposed to the outside world by other methods, not limited to the above two methods.

[0168] Referring to FIG10 , the bottom plate aluminum layer 422 can cover the entire main body 4211 and expose the edge portion 4212. Since the bottom plate aluminum layer 422 has the effect of reducing the corrosion of the bottom plate steel layer 421, this setting can increase the area of ​​the bottom plate aluminum layer 422 covering the bottom plate steel layer 421, thereby increasing the area of ​​the bottom plate steel layer 421 protected. At the same time, the larger area of ​​the bottom plate aluminum layer 422 can also enable the temperature control component 50 to have a larger connection area when connected. The bottom plate aluminum layer 422 can also only cover part of the main body 4211. The body 4211 is exposed, and the part of the main body 4211 close to the edge portion 4212 is exposed. When the edge portion 4212 is connected to the side beam steel layer 411 and forms a connection structure, this arrangement can create a space between the bottom plate aluminum layer 422 and the connection structure, thereby reducing the interference of the bottom plate aluminum layer 422 on the connection between the edge portion 4212 and the side beam steel layer 411, and at the same time, it can also reduce the damage caused to the bottom plate aluminum layer 422 by the edge portion 4212 during the connection to the side beam steel layer 411.

[0169] Because the bottom plate 42 includes a bottom plate steel layer 421 and a bottom plate aluminum layer 422, this embodiment makes the bottom plate steel layer 421 include a main body 4211 and an edge portion 4212 arranged on the side of the main body 4211, and makes the bottom plate aluminum layer 422 only cover the main body 4211 and expose the edge portion 4212, so that the bottom plate steel layer 421 is connected to the side beam steel layer 411 at the edge portion 4212; the bottom plate steel layer 421 can be connected to the side beam steel layer 411 at the edge portion 4212, so that the material of the connection part of the bottom plate steel layer 421 and the side beam steel layer 411 can be the same or approximately the same, and the melting point of the connection part of the two can be relatively close, thereby enhancing the mechanical strength of the connection part of the two.

[0170] Referring to Figures 11 and 12, in some embodiments, the bottom plate steel layer 421 includes a main body 4211 and an edge portion 4212 arranged on the peripheral side of the main body 4211. The edge portion 4212 is bent relative to the main body 4211 in the direction of the bottom plate aluminum layer 422, and the side of the edge portion 4212 facing away from the bottom plate aluminum layer 422 is connected to the side beam steel layer 411.

[0171] The main body portion 4211 refers to a portion at a central position in the bottom plate steel layer 421 , and the edge portion 4212 refers to a portion at an edge position in the bottom plate steel layer 421 . The edge portion 4212 is located on the peripheral side of the main body portion 4211 .

[0172] The edge portion 4212 is bent relative to the main body portion 4211, and the bending angle of the edge portion 4212 relative to the main body can be 90°, 180° or other angles; the bent edge portion 4212 can be connected to the side beam steel layer 411 through the side away from the bottom plate aluminum layer 422.

[0173] Since the edge portion 4212 is connected to the side beam steel layer 411 through the side away from the bottom plate aluminum layer 422 after being bent, the bottom plate aluminum layer 422 can cover the entire bottom plate steel layer 421 or only cover the main body 4211.

[0174] This embodiment enables the edge portion 4212 to be bent and cover part of the main body portion 4211. The bent edge portion 4212 can also be opposite to the side beam 41 and connected to the side beam 41, so that the bottom plate steel layer 421 can be connected to the side beam steel layer 411, thereby improving the connection strength and stability; at the same time, the bent edge portion 4212 can also make the part of the bottom plate aluminum layer 422 close to the edge portion 4212 be on the side of the bottom plate steel layer 421 away from the side beam 41, so as to reduce the interference of the bottom plate aluminum layer 422 with the connection between the bottom plate steel layer 421 and the side beam steel layer 411, and can also play a role in protecting the bottom plate aluminum layer 422.

[0175] 11 and 12 , in some embodiments, the edge portion 4212 is perpendicular to the main body portion 4211 , or the edge portion 4212 is folded onto the main body portion 4211 .

[0176] Referring to Figure 11, the edge portion 4212 is perpendicular to the main body portion 4211, that is, the edge portion 4212 is bent 90° relative to the main body portion 4211. At this time, the edge portion 4212 can be connected to the side of the side beam 41 facing the inside of the accommodating cavity 401; the bent edge portion 4212 faces away from the side of the bottom plate aluminum layer 422 toward the side beam 41 and is connected to the side beam steel layer 411.

[0177] In such a bottom plate steel layer 421 , the interference of the bottom plate aluminum layer 422 with the connection between the bottom plate steel layer 421 and the side beam steel layer 411 can be reduced, and the bottom plate aluminum layer 422 can also be protected.

[0178] Referring to Figure 12, the edge portion 4212 can also cover part of the main body portion 4211, that is, the edge portion 4212 is bent 180° relative to the main body portion 4211 and covers part of the main body portion 4211 in the thickness direction of the plate body, specifically covering the area of ​​the main body portion 4211 close to the edge portion 4212; the side of the bent edge portion 4212 away from the bottom plate aluminum layer 422 can face the side beam 41 and be connected to the side beam 41, and the part of the bottom plate aluminum layer 422 close to the edge portion 4212 can be clamped by the edge portion 4212 between the edge portion 4212 and the main body 4211.

[0179] In such a bottom plate steel layer 421, the bending of the edge portion 4212 can make the side of the edge portion 4212 away from the bottom plate aluminum layer 422 directly opposite to the side beam 41, so that the bottom plate steel layer 421 can be directly connected to the side beam steel layer 411, thereby making the connection strength between the plate body and the side beam 41 stronger; the bent edge portion 4212 can also clamp the bottom plate aluminum layer 422 between the main body 4211 and the edge portion 4212, thereby reducing the influence of the bottom plate aluminum layer 422 on the connection between the bottom plate steel layer 421 and the side beam steel layer 411, and also protecting the bottom plate aluminum layer 422.

[0180] In this embodiment, the edge portion 4212 can be perpendicular to the main body 4211 and connected to the side beam 41, or it can be folded on the main body 4211 and connected to the side beam 41, so that the staff can choose the bending method according to the actual working conditions, thereby increasing the adaptability of the box body 400 structure.

[0181] 13 , in some embodiments, the side beam 41 further includes a side beam aluminum layer 412 covering at least a portion of the side beam steel layer 411 .

[0182] The side beam aluminum layer 412 refers to a layered structure in which the main material of the side beam 41 is aluminum. At this time, the side beam aluminum layer 412 mainly has the characteristics of aluminum. For example, the material of the side beam aluminum layer 412 can include only aluminum, or it can include other materials and make the specific gravity of aluminum greater than the specific gravity of other materials.

[0183] The connection between the bottom plate 42 and the side beam 41 can be achieved by connecting the bottom plate aluminum layer 422 to the side beam aluminum layer 412, or by connecting the bottom plate steel layer 421 to the side beam steel layer 411; the side beam aluminum layer 412 can also be used to provide a welding basis for other aluminum structures in the box body 400; the side beam aluminum layer 412 can also play an anti-corrosion role to reduce the external corrosion that the side beam steel layer 411 may be subjected to; compared with the side beam 41 of pure steel structure, the setting of the side beam aluminum layer 412 can also further improve the strength of the side beam 41.

[0184] The side beam aluminum layer 412 may cover only part of the side beam steel layer 411, or may cover the entire side beam steel layer 411; for example, the side beam aluminum layer 412 may cover the portion where the side beam 41 is connected to the bottom plate 42, so that the side beam aluminum layer 412 can be connected to the bottom plate aluminum layer 422; for another example, the side beam aluminum layer 412 may not cover the portion where the side beam 41 is connected to the bottom plate 42, so that the side beam steel layer 411 can be connected to the bottom plate steel layer 421; it is understandable that there may be other positional relationships between the side beam aluminum layer 412 and the side beam steel layer 411, and is not limited to the above two types.

[0185] The side beam steel layer 411 and the side beam aluminum layer 412 can be compounded and formed into a plate through a rolling process, or they can be compounded through explosive compounding, adhesive compounding or other methods; after the side beam steel layer 411 and the side beam aluminum layer 412 are compounded and formed into a plate, the plate can be rolled to form the side beam 41, or the plate can be rolled and arc welded separately to form the side beam 41, or the plate can be processed into the side beam 41 by other methods; it can be understood that in addition to the side beam steel layer 411 and the side beam aluminum layer 412, the side beam 41 can also include a layered structure of other materials and compound it with the side beam steel layer 411 and the side beam aluminum layer 412.

[0186] 13 , in some embodiments, the edge portion 4212 is welded to the edge beam steel layer 411 .

[0187] The edge portion 4212 is welded to the side beam steel layer 411, that is, the bottom plate steel layer 421 is connected to the side beam steel layer 411, and the specific connection method can be welding, bonding or other methods. For example, the bottom plate steel layer 421 and the side beam steel layer 411 can be connected by laser welding. Laser welding has a large welding depth and small material deformation. Laser welding can also perform long-distance non-contact welding, is more flexible and can adapt to various complex welding positions. The weld formed by laser welding has high mechanical strength and good sealing. For another example, the bottom plate steel layer 421 and the side beam steel layer 411 can be connected by brazing. Brazing has a fast heating speed, small material deformation and simple operation. The joint formed by brazing has high mechanical strength and good airtightness.

[0188] The edge portion 4212 is welded to the side beam steel layer 411, that is, the side beam aluminum layer 412 does not cover the portion where the side beam 41 is connected to the bottom plate 42, which can be achieved in a variety of ways. In some embodiments, before the side beam steel layer 411 and the side beam aluminum layer 412 are compounded, the area of ​​the side beam aluminum layer 412 can be made smaller than the area of ​​the side beam steel layer 411, that is, when cutting the material, the area of ​​the side beam aluminum layer 412 can be made smaller than the area of ​​the side beam steel layer 411, so that after the side beam aluminum layer 412 and the side beam steel layer 411 are compounded, the portion where the side beam steel layer 411 is connected to the bottom plate 42 can be exposed; in other embodiments, after the side beam steel layer 411 and the side beam aluminum layer 412 are compounded, the portion where the side beam steel layer 411 is connected to the bottom plate 42 can be exposed by stripping aluminum. The portion where the side beam steel layer 411 is connected to the bottom plate 42, for example, after the side beam steel layer 411 and the side beam aluminum layer 412 are compounded, the portion where the side beam aluminum layer 412 is connected to the bottom plate 42 is peeled off to reveal the portion where the side beam steel layer 411 is connected to the bottom plate 42. The peeling can be performed by laser peeling, knife shear peeling or other methods; it can be understood that other methods can also be used to expose the portion where the side beam steel layer 411 is connected to the bottom plate 42 to the outside world, and are not limited to the above two methods.

[0189] According to some embodiments of the present application, referring to FIG. 4 and FIG. 5 , the lower box body 40 further includes a reinforcing beam 60 , which is accommodated in the accommodating cavity 401 and is a steel beam; the bottom plate steel layer 421 is connected to the reinforcing beam 60 .

[0190] The reinforcing beam 60 refers to the structure in the accommodating cavity 401 in the lower box body 40. The reinforcing beam 60 can be an expansion beam used to suppress the expansion of the battery cell 300, or it can be a structural beam used to enhance the structural strength of the lower box body 40; the reinforcing beam 60 can be a box beam, an I-beam or a beam body of other shapes; the cross-sectional shape of the reinforcing beam 60 can be square or other shapes; when the reinforcing beam 60 is a box beam, the reinforcing beam 60 can be formed by rolling, or by local rolling combined with arc welding, or the reinforcing beam 60 can be formed by other methods.

[0191] The reinforcing beam 60 can be connected to the side beam 41 to strengthen the connection strength between the bottom plate 42 and the lower box body 40; because the bottom plate 42 has the function of supporting structures such as the battery cell 300, after the battery cell 300 is installed, the middle part of the bottom plate 42 will be under greater pressure. Connecting the bottom plate 42 to the reinforcing beam 60 can enhance the bearing capacity of the bottom plate 42 in the middle, so as to reduce the deformation of the bottom plate 42 in the middle or the failure of the connection between the bottom plate 42 and the lower box body 40 as a whole, thereby enhancing the supporting performance and bearing capacity of the bottom plate 42.

[0192] Since the main function of the reinforcing beam 60 is to enhance the overall strength of the box body 400 and to assist in enhancing the supporting performance and bearing capacity of the bottom plate 42 , making the reinforcing beam 60 a steel beam can make the reinforcing beam 60 have greater strength.

[0193] The bottom plate steel layer 421 and the reinforcing beam 60 can be connected in a variety of ways. In some embodiments, the bottom plate steel layer 421 is connected to the reinforcing beam 60 by bolts. For example, one end of the bolt passes through the bottom plate 42 and is fixed in the reinforcing beam 60 by threading to press the bottom plate steel layer 421 against the reinforcing beam 60. At this time, the bolt should not pass through the flow channel; in other embodiments, the bottom plate steel layer 421 is connected to the reinforcing beam 60 by welding. Since the material of the reinforcing beam 60 mainly includes steel, the first steel layer 521 of the plate body is welded to the reinforcing beam 60. The first steel layer 521 of the plate body can be exposed at a position opposite to the reinforcing beam 60 by stripping aluminum, etc., so that the first steel layer 521 can be welded to the reinforcing beam 60; the bottom plate steel layer 421 can also be connected to the reinforcing beam 60 by other methods, not limited to the above two methods.

[0194] The bottom plate steel layer 421 is connected to the reinforcing beam 60 so that the materials of the connecting portion of the bottom plate 42 and the reinforcing beam 60 can be the same or substantially the same, thereby enhancing the stability of the connecting portion of the bottom plate 42 and the reinforcing beam 60 .

[0195] When the bottom plate aluminum layer 422 is disposed on the side of the bottom plate steel layer 421 facing the reinforcing beam 60 , the portion of the bottom plate steel layer 421 facing the reinforcing beam 60 can be exposed by stripping aluminum or the like.

[0196] In this embodiment, the bottom plate steel layer 421 is connected to the reinforcing beam 60. Since the bottom plate steel layer 421 is stronger than the bottom plate aluminum layer 422, connecting the bottom plate steel layer 421 to the reinforcing beam 60 can enhance the stability of the connection and facilitate flexible selection of different connection methods such as welding and screwing.

[0197] According to some embodiments of the present application, referring to Figures 5, 6, 9, 10, and 14, the thickness of the bottom plate steel layer 421 is greater than the thickness of the bottom plate aluminum layer 422.

[0198] The thickness of the bottom plate steel layer 421 refers to the dimension of the bottom plate steel layer 421 in the height direction of the box body 400, which is the dimension shown by H2 in FIG14 ; the thickness of the bottom plate aluminum layer 422 sets the dimension of the bottom plate aluminum layer 422 in the height direction of the box body 400, which is the dimension shown by H1 in FIG14 .

[0199] Since the main function of the bottom plate steel layer 421 is to enhance the strength of the bottom plate 42, the thickness of the bottom plate steel layer 421 should be relatively thick to better enhance the strength of the bottom plate 42; since the main function of the bottom plate aluminum layer 422 is to make it easier to connect the temperature control component 50 to the bottom plate 42, under the premise that the temperature control component 50 can be connected to the bottom plate aluminum layer 422, the thickness of the bottom plate aluminum layer 422 should be relatively thin to reduce the overall thickness of the bottom plate 42 and reduce the space occupied by the bottom plate 42.

[0200] In this embodiment, the thickness of the bottom plate steel layer 421 is greater than the thickness of the bottom plate aluminum layer 422. Since the main function of the bottom plate steel layer 421 is to increase the strength of the bottom plate 42, the thickness of the bottom plate steel layer 421 is made thicker to better increase the strength of the bottom plate 42; and since the main function of the bottom plate aluminum layer 422 is to facilitate the connection of the flow channel tube 51, the thickness of the bottom plate aluminum layer 422 is made thinner, so that the bottom plate aluminum layer 422 can be connected to the flow channel tube 51 and can also reduce the space occupied by the bottom plate aluminum layer 422, thereby reducing the overall thickness of the plate body.

[0201] 14 , in some embodiments, the thickness of the bottom plate steel layer 421 ranges from 0.5 mm (millimeter) to 2.0 mm, and the thickness of the bottom plate aluminum layer 422 ranges from 0.05 mm to 1.0 mm.

[0202] The thickness of the bottom plate steel layer 421 refers to the dimension of the bottom plate steel layer 421 in the height direction of the box body 400, that is, the dimension shown by H1 in Figure 14; the specific thickness of the bottom plate steel layer 421 can be 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2.0mm or other values.

[0203] The thickness of the bottom plate aluminum layer 422 sets the size of the bottom plate aluminum layer 422 in the height direction of the box 400, which is the size shown by H2 in Figure 14; the thickness of the bottom plate aluminum layer 422 can be 0.05mm, 0.1mm, 0.25mm, 0.4mm, 0.55mm, 0.7mm, 0.85mm, 1.0mm or other values.

[0204] Since the main function of the bottom plate steel layer 421 is to enhance the strength of the bottom plate 42, the thickness of the bottom plate steel layer 421 should be relatively thick to better enhance the strength of the bottom plate 42; since the main function of the bottom plate aluminum layer 422 is to make it easier to connect the temperature control component 50 to the bottom plate 42, under the premise that the temperature control component 50 can be connected to the bottom plate aluminum layer 422, the thickness of the bottom plate aluminum layer 422 should be relatively thin to reduce the overall thickness of the bottom plate 42 and reduce the space occupied by the bottom plate 42.

[0205] This embodiment provides some thickness ranges for the bottom plate steel layer 421 and the bottom plate aluminum layer 422, so that the thickness of the bottom plate steel layer 421 can be greater than the thickness of the bottom plate aluminum layer 422, thereby increasing the strength of the temperature control component 50; at the same time, it also enables the bottom plate aluminum layer 422 to be connected to the flow channel tube 51, and can also reduce the space occupied by the bottom plate aluminum layer 422, thereby reducing the overall thickness of the plate body.

[0206] According to some embodiments of the present application, referring to FIG. 19 and FIG. 20 , a through hole 424 is provided on the bottom plate 42 , and the temperature control assembly 50 covers the through hole 424 .

[0207] The through hole 424 refers to a through hole opened on the bottom plate 42, and the accommodating cavity 401 can be connected with the outside world at the through hole 424; when the bottom plate 42 includes a bottom plate aluminum layer 422 and a bottom plate steel layer 421, the through hole 424 passes through the bottom plate aluminum layer 422 and the bottom plate steel layer 421; the shape of the through hole 424 can be circular, square or other shapes.

[0208] The temperature control component 50 covers the through hole 424, that is, the temperature control component 50 can close the through hole 424; the temperature control component 50 can be arranged inside the accommodating cavity 401 and cover the through hole 424. For example, the relatively flat surface of the temperature control component 50 faces the inside of the accommodating cavity 401, and the other side faces the through hole 424. At this time, the protruding portion on the temperature control component 50 can enter the through hole 424, thereby reducing the height of the temperature control component 50 protruding from the bottom plate 42. At the same time, the relatively flat surface facing the accommodating cavity 401 can also reduce the temperature control component 50 on the installation and arrangement of the battery cell 300. Negative impact; the temperature control component 50 can also be arranged outside the accommodating cavity 401 and cover the through hole 424. For example, the relatively flat surface of the temperature control component 50 is away from the accommodating cavity 401, and the other side is facing the accommodating cavity 401. At this time, the protruding part on the temperature control component 50 can enter the through hole 424, so that the temperature control component 50 can contact the battery cell 300 in the accommodating cavity 401, thereby facilitating the improvement of the heat exchange efficiency. At the same time, the relatively flat surface facing the outside can also reduce the occupation of the external space by the temperature control component 50, and reduce the overall installation requirements of the box 400 for the external space.

[0209] Because the temperature control component 50 is connected to the bottom plate aluminum layer 422, when the temperature control component 50 is arranged inside the accommodating cavity 401, the bottom plate aluminum layer 422 is arranged on the side of the bottom plate steel layer 421 facing the accommodating cavity 401, and when the temperature control component 50 is arranged outside the accommodating cavity 401, the bottom plate aluminum layer 422 is arranged on the side of the bottom plate steel layer 421 away from the accommodating cavity 401; the bottom plate aluminum layer 422 can be arranged only around the through hole 424 and cover the corresponding bottom plate steel layer 421 for connection of the temperature control component 50, or it can cover the entire bottom plate steel layer 421.

[0210] The temperature control component 50 can be partially overlapped on the base plate 42; the temperature control component 50 can also be placed in the through hole 424 and connected to the side wall of the through hole 424. At this time, the base plate aluminum layer 422 can be bent into the through hole 424 and cover at least part of the side wall of the through hole 424 for the temperature control component 50 to be connected.

[0211] The temperature control component 50 can have a variety of structures; for example, the temperature control component 50 may include a first plate body 52 and a second plate body 53, and a flow channel is formed between the first plate body 52 and the second plate body 53. In this case, the first plate body 52 can be connected to the bottom plate 42, or the second plate body 53 can be connected to the bottom plate 42; for another example, the temperature control component 50 can also include a flow channel tube 51. In this case, the temperature control component 50 can also include a plate, so that the flow channel tube 51 is connected to the plate, and the plate covers the through hole 424.

[0212] This embodiment provides other specific structures of the lower box 40, in which a through hole 424 is opened on the bottom plate 42, and the temperature control component 50 is covered on the through hole 424. This can not only enable the temperature control component 50 to better exchange heat with the accommodating cavity 401, but also accommodate part of the temperature control component 50 through the through hole 424 to reduce the space occupied by the temperature control component 50 in the accommodating cavity 401.

[0213] 20 , in some embodiments, the bottom plate aluminum layer 422 is disposed on the side of the bottom plate steel layer 421 facing the accommodating cavity 401 , and the temperature control assembly 50 is disposed on the side of the bottom plate 42 facing the accommodating cavity 401 .

[0214] The temperature control component 50 is arranged on the side of the bottom plate 42 facing the accommodating cavity 401, that is, the temperature control component 50 is arranged in the accommodating cavity 401. At this time, in addition to being used for heat exchange with the battery cell 300 to control the temperature of the battery cell 300, the temperature control component 50 is also used to support the battery cell 300 or other structures in the accommodating cavity 401. This setting can enhance the supporting ability of the temperature control component 50 for the battery cell 300, and can also reduce the load at the connection between the temperature control component 50 and the bottom plate 42; if the temperature control component 50 is arranged on the side of the bottom plate 42 away from the accommodating cavity 401, the pressure of the battery cell 300 and other structures on the temperature control component 50 will easily be concentrated at the position where the temperature control component 50 is connected to the bottom plate 42, and it is easy to cause fracture and the like at this position. At this time, the strength requirements of the connection structure between the temperature control component 50 and the bottom plate 42 are relatively high.

[0215] The temperature control component 50 is arranged in the accommodating cavity 401, and the protruding part in the temperature control component 50 can be at least partially accommodated in the through hole 424. At this time, the side wall of the through hole 424 can protect the temperature control component 50, thereby reducing the damage that may be caused to the temperature control component 50 by the external environment.

[0216] Since the temperature control component 50 is arranged on the side of the bottom plate 42 facing the accommodating cavity 401, and the temperature control component 50 is connected to the bottom plate aluminum layer 422, the bottom plate aluminum layer 422 is arranged on the side of the bottom plate steel layer 421 facing the accommodating cavity 401 to facilitate the connection of the temperature control component 50 to the bottom plate 42.

[0217] In this embodiment, the bottom plate aluminum layer 422 is arranged on the side of the bottom plate steel layer 421 facing the accommodating cavity 401, so that the temperature control component 50 can be located in the accommodating cavity 401 to enhance the supporting performance of the temperature control component 50; at the same time, it can also reduce the height of the temperature control component 50 protruding from the bottom plate 42, thereby reducing the temperature control component 50's demand for external space and protecting part of the temperature control component 50.

[0218] According to some embodiments of the present application, referring to Figures 5, 6, and 15 to 17, the lower box body 40 includes a side beam 41, and the side beam 41 includes a side beam steel layer 411 and a side beam aluminum layer 412 that at least partially covers the side beam steel layer 411; the temperature control component 50 is welded to the side beam aluminum layer 412.

[0219] When the lower box body 40 includes the side beam 41 , the box body steel layer includes the side beam steel layer 411 , and the box body aluminum layer includes the side beam aluminum layer 412 . At this time, the temperature control aluminum layer is connected to the side beam aluminum layer 412 .

[0220] The temperature control component 50 can be connected to the side beam aluminum layer 412 and can form a accommodating cavity 401, that is, the temperature control component 50 serves as the bottom structure of the lower box body 40 and forms a accommodating cavity 401 with the side beam 41; accordingly, the side beam steel layer 411 is covered with the side beam aluminum layer 412 at least on the part opposite to the temperature control component 50 for connection of the temperature control component 50.

[0221] In addition to being used for heat exchange with the accommodating cavity 401, the temperature control component 50 is also used to carry the battery cell 300 and provide protection for the battery cell 300 and other structures in the accommodating cavity 401. At this time, the temperature control component 50 can serve as the bottom plate of the lower box body 40, and the lower box body 40 does not need to be additionally provided with a bottom plate.

[0222] In this embodiment, the lower box body 40 includes a side beam 41, and the temperature control component 50 is connected to the side beam 41, so that the temperature control component 50 and the side beam 41 can form a accommodating cavity 401 for accommodating the battery cell 300. Even if the temperature control component 50 serves as the bottom structure of the lower box body 40 and replaces the bottom plate 42, the box body 400 does not need to accommodate the temperature control component 50, thereby reducing the volume required for the box body 400, thereby reducing the volume of the box body 400, reducing the space occupied by the box body 400, improving the integration level of the box body 400, and reducing the overall weight of the box body 400.

[0223] Referring to Figures 15 and 16, in some embodiments, the temperature control component 50 includes a first plate 52 and a second plate 53, a flow channel is formed between the first plate 52 and the second plate 53, the first plate 52 includes a first aluminum layer 522, the second plate 53 includes a second aluminum layer 531, and the first aluminum layer 522 is connected to the second aluminum layer 531; the temperature control aluminum layer includes the first aluminum layer 522 or the second aluminum layer 531, and the first aluminum layer 522 or the second aluminum layer 531 is welded to the side beam aluminum layer 412.

[0224] A flow channel is formed between the first plate 52 and the second plate 53, that is, the first plate 52 and the second plate 53 can form a flow channel; for example, a groove can be provided on either the first plate 52 or the second plate 53, and the other of the two can be covered on the groove to form a flow channel; for another example, either or both of the first plate 52 and the second plate 53 can be bent into a groove-shaped structure and covered with each other to form a flow channel; it can be understood that the first plate 52 and the second plate 53 can also form a flow channel in other ways, and are not limited to the above two methods.

[0225] The first plate 52 refers to the structure constituting the temperature control component 50; the shape of the first plate 52 can be square, circular or other shapes; the second plate 53 refers to the structure constituting the temperature control component 50; the shape of the second plate 53 can be square, circular or other shapes; the temperature control component 50 can be connected to the side beam 41 through the first plate 52, and can also be connected to the side beam 41 through the second plate 53.

[0226] The first aluminum layer 522 refers to a layered structure in the first plate body 52 that mainly includes aluminum. At this time, the first aluminum layer 522 mainly has the characteristics of aluminum. For example, the material of the first aluminum layer 522 can include only aluminum, or it can include other materials and make the specific gravity of aluminum greater than the specific gravity of other materials; in addition to the first aluminum layer 522, the first plate body 52 can also include a layered structure of other materials and be compounded with the first aluminum layer 522.

[0227] The second aluminum layer 531 refers to a layered structure in the second plate body 53 that mainly includes aluminum. In this case, the second aluminum layer 531 mainly has the characteristics of aluminum. For example, the material of the second aluminum layer 531 can include only aluminum, or it can include other materials and make the specific gravity of aluminum greater than the specific gravity of other materials; in addition to the second aluminum layer 531, the second plate body 53 can also include a layered structure of other materials and be compounded with the second aluminum layer 531.

[0228] When the temperature control component 50 includes a first plate body 52 and a second plate body 53, the temperature control aluminum layer includes a first aluminum layer 522 or a second aluminum layer 531. At this time, the first aluminum layer 522 or the second aluminum layer 531 is welded to the bottom plate aluminum layer 422; for example, the first aluminum layer 522 can be welded to the side beam aluminum layer 412, and the second aluminum layer 531 can be welded to the side beam aluminum layer 412.

[0229] The first aluminum layer 522 is connected to the second aluminum layer 531, so that the first plate body 52 can be connected to the second plate body 53, and the material of the connecting portion of the first plate body 52 and the second plate body 53 is the same, which reduces the difficulty of connection. At the same time, it can also make the first aluminum layer 522 and the second aluminum layer 531 have the same or approximately the same deformation when the external environment changes, reducing the difference in deformation between the first aluminum layer 522 and the second aluminum layer 531, thereby reducing the additional load on the connecting portion of the first aluminum layer 522 and the second aluminum layer 531 due to the deformation of the two, thereby enhancing the stability of the connection.

[0230] 15 , in some embodiments, the first plate 52 is provided with a second groove 523 in a direction away from the side beam 41 . The second plate 53 is provided on a side of the first plate 52 facing the side beam 41 and covers the second groove 523 .

[0231] The second groove 523 refers to a groove structure recessed on the first plate body 52 in a direction away from the side beam 41. The opening of the second groove 523 faces the side beam 41, that is, the opening of the second groove 523 also faces the second plate body 53; the second groove 523 can be a semicircular groove, a rectangular groove, a trapezoidal groove or a groove of other shapes.

[0232] The second plate body 53 can cover the second groove 523 and cooperate with the second groove 523 to form a flow channel. At this time, the inner wall of the second groove 523 and the side wall of the second plate body 53 facing the first plate body 52 together form a flow channel, and the heat exchange medium can flow in the flow channel; the second plate body 53 can be a flat plate structure or a structure of other shapes; the connection between the second plate body 53 and the first plate body 52 should have strong sealing to reduce the occurrence of the heat exchange medium flowing into the accommodating cavity 401.

[0233] For example, the second plate 53 can be a flat plate structure. Since the second plate 53 is arranged on the side of the first plate 52 facing the accommodating cavity 401, this arrangement can reduce the space occupied by the second plate 53 in the accommodating cavity 401, and at the same time can reduce the negative impact that may be caused on the installation of the battery cell 300 in the box body 400, making it easier for the battery cell 300 to be installed and arranged in the required manner.

[0234] 15 , in some embodiments, the surface of the second plate 53 facing away from the first plate 52 is a plane.

[0235] The surface of the second plate 53 facing away from the first plate 52 is the surface of the second plate 53 facing the interior of the box 400. Making this surface flat can reduce the space occupied by the second plate 53 inside the box 400 and facilitate the arrangement of structures such as the battery cells 300 in the box 400.

[0236] Referring to Figure 17, in some embodiments, the first plate body 52 also includes a first steel layer 521, which is arranged on the side of the first aluminum layer 522 away from the second aluminum layer 531; and / or the second plate body 53 also includes a second steel layer 532, which is arranged on the side of the second aluminum layer 531 away from the first aluminum layer 522.

[0237] The first steel layer 521 refers to the layered structure mainly including steel in the first plate body 52. ​​The first plate body 52 including the first steel layer 521 can increase the strength of the first plate body 52, thereby increasing the overall strength of the temperature control component 50; because the temperature control component 50 as the bottom structure of the lower box body 40 requires certain supporting performance, and also needs to provide protection for structures such as the battery cell 300 in the accommodating cavity 401, the first plate body 52 including the first steel layer 521 can improve the strength of the temperature control component 50, so that the temperature control component 50 can better provide support for structures such as the battery cell 300, and can better protect structures such as the battery cell 300 in the accommodating cavity 401.

[0238] Similar to the first plate body 52 , the second steel layer 532 refers to a layered structure mainly including steel in the second plate body 53 . The second plate body 53 including the second steel layer 532 can increase the strength of the second plate body 53 , thereby increasing the overall strength of the temperature control assembly 50 .

[0239] Since the first aluminum layer 522 is connected to the second aluminum layer 531 and forms a flow channel, the first steel layer 521 should be arranged on the side of the first aluminum layer 522 away from the second aluminum layer 531 , and the second steel layer 532 should be arranged on the side of the second aluminum layer 531 away from the first aluminum layer 522 .

[0240] Because the temperature control component 50 is connected to the side beam aluminum layer 412, when the second plate body 53 includes the second steel layer 532, the temperature control component 50 can be connected to the side beam aluminum layer 412 through the second aluminum layer 531. At this time, the second steel layer 532 does not cover the second aluminum layer 531 and the box beam portion of the side beam aluminum layer 412; when the second plate body 53 includes the second steel layer 532, the temperature control component 50 can also be connected to the side beam aluminum layer 412 through the first aluminum layer 522. At this time, the second steel layer 532 and the second aluminum layer 531 do not cover the first aluminum layer 522 and the box beam portion of the side beam aluminum layer 412.

[0241] This embodiment provides some specific structures of the first plate body 52 and the second plate body 53, so that the first plate body 52 also includes a first steel layer 521 to enhance the strength of the first plate body 52, thereby enhancing the strength of the temperature control component 50, so that the temperature control component 50 can better carry the battery cell 300; and the second plate body 53 also includes a second steel layer 532 to enhance the strength of the second plate body 53, thereby enhancing the strength of the temperature control component 50, so that the temperature control component 50 can better carry the battery cell 300.

[0242] In a second aspect, some embodiments of the present application further provide a battery 200 , comprising the housing 400 provided in some embodiments of the first aspect.

[0243] The battery 200 includes a housing 400 and a battery cell 300, which is accommodated in the housing 400. In the battery 200 provided in this embodiment, the temperature control assembly 50 is located outside the accommodation cavity 401, thereby reducing the overall volume and space occupied by the battery 200 and facilitating installation of the battery 200.

[0244] In a third aspect, some embodiments of the present application further provide an electric device 100 , comprising the battery 200 provided in some embodiments of the second aspect.

[0245] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A box for accommodating a battery cell, wherein: The box includes: A lower box body, the lower box body comprising a box body steel layer and a box body aluminum layer; A temperature control component is connected to the lower box body, and the temperature control component includes a temperature control aluminum layer, and the temperature control aluminum layer is welded to the box body aluminum layer.

2. The box according to claim 1, wherein: The lower box body includes a bottom plate and a receiving cavity formed on one side of the bottom plate, the bottom plate includes a bottom plate steel layer and a bottom plate aluminum layer, and the bottom plate aluminum layer at least covers a portion of the bottom plate steel layer; The box body steel layer includes the bottom plate steel layer, the box body aluminum layer includes the bottom plate aluminum layer, and the temperature control aluminum layer is welded to the bottom plate aluminum layer.

3. The box according to claim 2, wherein: The temperature control component includes a flow channel tube connected to the aluminum layer of the bottom plate, and a flow channel is formed in the flow channel tube.

4. The box according to claim 3, wherein: The bottom plate aluminum layer is arranged on the side of the bottom plate steel layer facing the accommodating cavity, and the bottom plate is provided with a first groove in a direction away from the accommodating cavity, and at least part of the flow channel pipe is accommodated in the first groove.

5. The box according to claim 4, wherein: The surface of the flow channel tube facing the accommodating cavity is flush with the surface of the bottom plate facing the accommodating cavity.

6. The box according to claim 3, wherein: The bottom plate aluminum layer is arranged on a side of the bottom plate steel layer facing away from the accommodating cavity.

7. The box according to any one of claims 3 to 6, wherein: The flow channel tube includes a structural aluminum layer, and the temperature control aluminum layer includes the structural aluminum layer, and the structural aluminum layer is brazed and connected to the bottom plate aluminum layer.

8. The box according to any one of claims 2 to 7, wherein: The lower box body further includes side beams, and the bottom plate is connected to the side beams and forms the accommodating cavity with the side beams.

9. The box according to claim 8, wherein: The side beam includes a side beam steel layer, and the side beam steel layer is connected to the bottom plate steel layer.

10. The box according to claim 9, wherein: The bottom plate steel layer includes a main body and an edge portion arranged around the main body. The bottom plate aluminum layer covers the main body and exposes the edge portion. The edge portion is connected to the side beam steel layer.

11. The housing according to claim 9, wherein: The bottom plate steel layer includes a main body and an edge portion arranged on the peripheral side of the main body. The edge portion is bent relative to the main body in the direction of the bottom plate aluminum layer, and the side of the edge portion away from the bottom plate aluminum layer is connected to the side beam steel layer.

12. The housing according to claim 11, wherein: The edge portion is perpendicular to the main body portion, or the edge portion is folded onto the main body portion.

13. The box according to any one of claims 10 to 12, wherein: The edge portion is welded to the side beam steel layer.

14. The box according to any one of claims 9 to 13, wherein: The side beam further includes a side beam aluminum layer covering at least a portion of the side beam steel layer.

15. The box according to any one of claims 2 to 14, wherein: The lower box body further includes a reinforcing beam, which is accommodated in the accommodating cavity and is a steel beam; The bottom plate steel layer is connected to the reinforcing beam.

16. The box according to any one of claims 2 to 15, wherein: The thickness of the bottom plate steel layer is greater than the thickness of the bottom plate aluminum layer.

17. The housing according to claim 16, wherein: The thickness of the bottom plate steel layer ranges from 0.5 mm to 2.0 mm, and the thickness of the bottom plate aluminum layer ranges from 0.05 mm to 1.0 mm.

18. The box according to any one of claims 2 to 17, wherein: A through hole is provided on the bottom plate, and the temperature control component covers the through hole.

19. The housing according to claim 18, wherein: The bottom plate aluminum layer is arranged on a side of the bottom plate steel layer facing the accommodating cavity, and the temperature control component is arranged on a side of the bottom plate facing the accommodating cavity.

20. The housing according to claim 1, wherein The lower box body includes a side beam, and the side beam includes a side beam steel layer and a side beam aluminum layer covering at least a portion of the side beam steel layer; The box body steel layer includes the side beam steel layer, the box body aluminum layer includes the side beam aluminum layer, and the temperature control aluminum layer is welded to the side beam aluminum layer.

21. The housing according to claim 20, wherein: The temperature control assembly includes a first plate and a second plate, a flow channel is formed between the first plate and the second plate, the first plate includes a first aluminum layer, the second plate includes a second aluminum layer, and the first aluminum layer is connected to the second aluminum layer; The temperature-controlled aluminum layer includes the first aluminum layer or the second aluminum layer, and the first aluminum layer or the second aluminum layer is welded to the side beam aluminum layer.

22. The housing according to claim 21, wherein: The first plate body is provided with a second groove in a direction away from the side beam, and the second plate body is provided on a side of the first plate body facing the side beam and covers the second groove.

23. The housing according to claim 22, wherein: A surface of the second plate body facing away from the first plate body is a plane.

24. The housing according to claim 22 or 23, wherein: The first plate further includes a first steel layer, the first steel layer being arranged on a side of the first aluminum layer facing away from the second aluminum layer; and / or The second plate body further includes a second steel layer, and the second steel layer is arranged on a side of the second aluminum layer facing away from the first aluminum layer.

25. A battery, wherein: The invention comprises a box as claimed in any one of claims 1 to 24.

26. An electrical device, wherein: Comprising the battery of claim 25.

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