Box body, battery and electric equipment

Abstract

The invention relates to the technical field of box body structures, and provides a box body, a battery and electric equipment, the box body comprises a bottom plate, the bottom plate comprises a composite plate and a heat exchange plate, the composite plate comprises a first material part formed by a first material and a second material part formed by a second material, and a first welding surface is formed on part of the surface of the composite plate; the first welding surface is formed by a first material part; part of the surface of the heat exchange plate forms a second welding surface, the heat exchange plate at the second welding surface is made of a third material, and the third material and the first material are the same material; the first welding surface is welded on the second welding surface; according to the box body provided by the embodiment of the invention, the bottom plate of the box body comprises the composite plate and the heat exchange plate, and the purpose of reducing the cost is achieved by replacing an aluminum plate with the composite plate, so that the problem that the quality of the box body is affected due to the fact that the heat exchange plate is difficult to weld can be effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of box structure, and in particular provides a box, a battery and an electrical device. Background Art

[0002] With the development of power batteries, it has become a development trend to significantly reduce the cost of battery boxes by replacing materials. However, since the heat exchange structure of the box needs to use materials with better thermal conductivity, the heat exchange structure and the box are replaced with different materials. Different materials have different melting points and are difficult to weld, which may affect the overall quality of the box. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a box, a battery and an electrical device, aiming to solve the problem that the heat exchange plate is difficult to weld and fix in the related art.

[0004] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is:

[0005] In the first aspect, an embodiment of the present application provides a box for accommodating battery cells, the box including a bottom plate, the bottom plate including a composite plate and a heat exchange plate, the composite plate including a first material portion formed of a first material and a second material portion formed of a second material, a portion of the surface of the composite plate forms a first welding surface, and the first welding surface is formed by the first material portion; a portion of the surface of the heat exchange plate forms a second welding surface, the heat exchange plate at the second welding surface is formed of a third material, and the third material and the first material are the same material; the first welding surface is welded to the second welding surface.

[0006] Beneficial effects of the embodiments of the present application: The box body provided by the embodiments of the present application, the bottom plate of the box body includes a composite plate and a heat exchange plate, and the composite plate is used instead of the aluminum plate to achieve the purpose of reducing costs. At the same time, the third material used to form the second welding surface of the heat exchange plate and the first material used for the first material part of the composite plate to form the first welding surface are the same material. Therefore, the first welding surface and the second welding surface can be welded to each other to achieve the purpose of welding and fixing the heat exchange plate to the composite plate, so as to improve the connection reliability of the heat exchange plate, and thus can effectively improve the problem that the heat exchange plate is difficult to weld and thus affects the quality of the box body.

[0007] In some embodiments, the first material portion includes at least one of a copper alloy or an aluminum alloy.

[0008] By adopting the above technical solution, the first material may include at least one of copper alloy and aluminum alloy. Copper alloy and aluminum alloy have better thermal conductivity, so the heat dissipation effect of the base plate including the composite plate is better.

[0009] In some embodiments, the first material portion includes a copper alloy layer or an aluminum alloy layer.

[0010] By adopting the above technical solution, the first welding surface is formed on the surface of the copper alloy layer or the aluminum alloy layer, so that the second welding surface of the heat exchange plate can be welded to the copper alloy layer or the aluminum alloy layer.

[0011] In some embodiments, the second material includes a steel alloy.

[0012] By adopting the above technical solution, the cost of steel alloy is lower than that of aluminum alloy or copper alloy. Therefore, the second material part including steel alloy can effectively reduce the cost of the bottom plate, and further reduce the cost of the box body.

[0013] In some embodiments, the second material portion includes a steel alloy layer.

[0014] By adopting the above technical solution and using the steel alloy layer as a partial layer structure of the composite plate, the purpose of reducing the cost of the composite plate is effectively achieved.

[0015] In some embodiments, the box body further includes a frame, and the frame and the composite board are integrally formed.

[0016] By adopting the above-mentioned technical solution, the frame and the composite panel can be formed as one piece, that is, the frame can also adopt a composite structure instead of an aluminum structure, which can further reduce the cost of the box; at the same time, the integral forming of the frame and the composite panel can reduce the welding process between the composite panel and the frame, and the integrity of the frame and the composite panel is higher. Therefore, the overall structural strength of the frame and the composite panel is better.

[0017] In some embodiments, the box body also includes a frame, a portion of the surface of the frame forms a third welding surface, the frame at the third welding surface is formed of a fourth material, and the fourth material and the first material or the second material are the same material; the third welding surface is welded to the first welding surface.

[0018] By adopting the above technical solution, the composite plate and the frame can be fixedly connected by welding to improve the connection strength between the composite plate and the frame, thereby improving the quality of the box.

[0019] In some embodiments, one side of the composite plate forming the first welding surface is recessed toward the other side opposite to form a first guide groove, and the heat exchange plate is sealed in the first guide groove to form a flow channel.

[0020] By adopting the above-mentioned technical solution, a first guide groove can be formed on the composite plate, and the first welding surface is formed by being recessed toward the other side opposite thereto. Thus, when the heat exchange plate is welded to the first welding surface, the heat exchange plate can be sealed in the first guide groove and form a flow channel for heat dissipation inside the box.

[0021] In some embodiments, a side of the composite plate forming the first welding surface is disposed toward the battery cell.

[0022] By adopting the above-mentioned technical solution, one side of the composite plate forming the first welding surface is arranged toward the battery cell. Therefore, the first guide groove formed by the depression on the other side opposite to the one side of the composite plate forming the first welding surface is convexly arranged outside the box body, which can effectively reduce the influence of the convex part formed by the depression to form the first guide groove on the space for accommodating the battery cell inside the box body.

[0023] In some embodiments, a second guide groove is formed in a depression on the heat exchange plate, and the composite plate is sealed on the second guide groove to form a flow channel.

[0024] By adopting the above technical solution, a second guide groove can be formed by a depression on the heat exchange plate. Therefore, when the heat exchange plate is welded to the first welding surface of the composite plate, the composite plate can cover the second guide groove and form a flow channel for cooling to provide heat dissipation treatment for the inside of the box.

[0025] In some embodiments, a side of the composite plate forming the first welding surface is disposed away from the battery cell.

[0026] By adopting the above technical solution, the side of the composite plate forming the first welding surface is arranged away from the battery cell, that is, the side of the composite plate forming the first welding surface is facing the outside of the box body, and the heat exchange plate with the second guide groove formed in the depression is welded to the first welding surface of the composite plate outside the box body to form a flow channel. Therefore, the convex structure generated by the depression of the heat exchange plate to form the second guide groove is arranged on the outside of the box body, which can effectively reduce the influence of the convex structure on the space inside the box body for accommodating the battery cell.

[0027] In some embodiments, the housing further includes a cooling water nozzle, which includes a water nozzle connecting portion formed of a fifth material, the fifth material and the first material are the same material, and the water nozzle connecting portion is welded to the first welding surface and connected to the flow channel.

[0028] By adopting the above technical solution, the cooling water nozzle is used to connect the flow channel and can introduce or export coolant into the flow channel to achieve the purpose of heat exchange and cooling. The cooling water nozzle can be welded integrally with the heat exchange plate to optimize the welding assembly process and reduce the manufacturing process of the box.

[0029] In some embodiments, the thickness of the first material portion is M, 0.05 mm ≤ M ≤ 3 mm.

[0030] By adopting the above technical solution, the thickness of the first material part is set to be greater than or equal to 0.05 mm and less than or equal to 3 mm, so that the first material part can form a certain thickness to facilitate smooth welding and connection between the heat exchange plate and the first welding surface.

[0031] In some embodiments, the thickness M of the first material portion is 0.1 mm≤M≤1.5 mm.

[0032] By adopting the above-mentioned technical solution, on the basis of forming a certain thickness of the first material part so that the first welding surface can be welded and connected, the first material part is further optimized to be greater than or equal to 0.1 mm and less than or equal to 1.5 mm, which can further limit the thickness range of the first material part to improve the success rate of welding the first welding surface.

[0033] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell and a box as described above, wherein the battery cell is accommodated in the box.

[0034] Beneficial effects of the embodiments of the present application: The battery provided in the embodiments of the present application includes the above-mentioned box body. On the basis that the box body can use a composite plate to reduce costs and can weld the second welding surface of the heat exchange plate through the first welding surface, the cost of the battery is lower and the product quality of the battery is improved.

[0035] In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery as described above, and the battery is used to provide electrical energy.

[0036] Beneficial effects of the embodiments of the present application: The electrical equipment provided by the embodiments of the present application includes the above-mentioned battery. When the cost of the battery is lower, the cost of the electrical equipment can also be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0039] Figure 2 Exploded view of a battery provided in an embodiment of the present application

[0040] Figure 3 A schematic diagram of the structure of the frame and the base plate provided in the embodiment of the present application;

[0041] Figure 4 A schematic diagram of the connection between the composite plate and the heat exchange plate provided in the embodiment of the present application;

[0042] Figure 5 A cross-sectional view of a connection between a composite plate and a heat exchange plate provided in an embodiment of the present application;

[0043] Figure 6 A cross-sectional view of the connection between another composite plate and a heat exchange plate provided in an embodiment of the present application.

[0044] Among them, the reference numerals in the figure are:

[0045] 1000, vehicle; 100, battery; 200, controller; 300, motor;

[0046] 10. Box body; 11. First part; 12. Second part; 20. Battery cell;

[0047] 101, bottom plate; 1011, composite plate; 1011a, first welding surface; 10111, first material portion; 10112, second material portion; 10113, first guide groove; 1012, heat exchange plate; 1012a, second welding surface; 10121, second guide groove; 1013, flow channel; 102, frame. DETAILED DESCRIPTION

[0048] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0049] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", 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 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 should not be understood as a limitation on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0053] With the development of power batteries, how to reduce the cost of batteries has become an important development direction. In related technologies, the main method of reducing costs is to use steel instead of aluminum, that is, the bottom plate, frame and other structures of the box use steel to replace the existing aluminum; since the cost of steel is lower than that of aluminum, the cost of using steel for the box can be effectively reduced. However, for the heat exchange structure of the box, due to the poor heat dissipation of steel, the heat exchange structure formed by steel has poor heat dissipation effect. Therefore, the heat exchange structure still needs to be integrated with materials with good thermal conductivity such as aluminum and copper; however, due to the large difference in melting points between different materials, the heat exchange structure is difficult to connect through welding technology.

[0054] In order to solve the connection problem between the heat exchange structure and the base plate of different materials, a connection space can be reserved for the heat exchange structure in the design. Specifically, a connection hole is opened on the base plate, so that the heat exchange structure can be fixed to the base plate through the connection hole by fasteners to form a connection. Alternatively, an adhesive layer is reserved on the base plate, and the heat exchange structure is bonded to the base plate by coating the adhesive layer to form a fixed connection. However, the above-mentioned fastener connection method requires opening a hole in the base plate, which will affect the sealing and structural strength of the base plate; or, using the adhesive fixation connection method, the heat exchange structure may fall off due to the aging of the adhesive layer, which will affect the quality of the box.

[0055] Based on the above considerations, in order to solve the problem that it is difficult to weld heat exchange structures of different materials in the process of using a steel box due to the need to reduce costs, a box is designed. By adopting a composite plate, the composite plate is used to achieve the purpose of reducing costs. At the same time, the first material forming the first welding surface of the composite plate and the second material forming the second welding surface of the heat exchange plate are the same material. Therefore, the second welding surface of the heat exchange plate can be welded to the first welding surface of the composite plate, which effectively solves the problem that the heat exchange plate is difficult to install due to the inability to weld different materials. It can improve the problems of increased material costs, affecting the degree of automation of box production, and affecting the product quality of the box due to bonding or connecting the heat exchange plate with fasteners.

[0056] The battery cell disclosed in the embodiment of the present application can be used in electrical equipment that uses the battery as a power source or various energy storage systems that use the battery as an energy storage element. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. 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, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0057] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0058] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0059] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is contained in the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the housing 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0061] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0062] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0063] According to some embodiments of the present application, referring to Figures 2 to 6In the first aspect, the embodiment of the present application provides a box body 10 for accommodating a battery cell 20, the box body 10 includes a bottom plate 101, the bottom plate 101 includes a composite plate 1011 and a heat exchange plate 1012, the composite plate 1011 includes a first material portion 10111 formed by a first material and a second material portion 10112 formed by a second material, a portion of the surface of the composite plate 1011 forms a first welding surface 1011a, and the first welding surface 1011a is formed by the first material portion; a portion of the surface of the heat exchange plate 1012 forms a second welding surface 1012a, and the heat exchange plate 1012 at the second welding surface 1012a is formed by a third material, and the third material and the first material are the same material; the first welding surface 1011a is welded to the second welding surface 1012a.

[0064] The box body 10 may include a first portion 11 and a second portion 12 . The first portion 11 and the second portion 12 cover each other. The first portion 11 and the second portion 12 together define an accommodation space for accommodating the battery cell 20 .

[0065] In some embodiments, the second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define a accommodating space; in this embodiment, the bottom plate 101 can form the first part 11, or the bottom plate 101 can also be any side plate-like structure in the second part 12, for example, a side plate-like structure arranged opposite to the first part 11.

[0066] In other embodiments, the first part 11 and the second part 12 may also be hollow structures both with one side open, and the open side of the first part 11 covers the open side of the second part 12; in this embodiment, the bottom plate 101 may be any side plate-like structure in the first part 11, such as a side plate-like structure arranged opposite to the open side, or the bottom plate 101 may also be any side plate-like structure in the second part 12, such as a side plate-like structure arranged opposite to the open side.

[0067] The bottom plate 101 is an important component of the box body 10 , and can be used to carry components such as the battery cells 20 ; at the same time, the heat exchange plate 1012 on the bottom plate 101 is used for heat exchange and heat dissipation, thereby achieving heat exchange and heat dissipation of the heat inside the box body 10 .

[0068] The bottom plate 101 includes a composite plate 1011 and a heat exchange plate 1012; wherein the composite plate 1011 refers to a plate structure formed by combining multiple materials; for example, two or more thin plates of different materials can be rolled and combined by mechanical pressure, and two or more structural layers are bonded together by cold pressing or hot pressing to form a whole. Thus, the composite plate 1011 is formed by combining a lower-cost material with a high-cost metal material, for example, combining a lower-cost steel alloy with a higher-cost aluminum alloy, and the composite plate 1011 formed has a lower cost than the structure using aluminum alloy alone, so the use of the composite plate 1011 can achieve the purpose of saving costs.

[0069] The composite plate 1011 includes a first material part 10111 and a second material part 10112; wherein the first material part 10111 is formed of a first material, and the first material includes but is not limited to a metal material (copper, iron, aluminum, etc.), or a non-metal material (such as plastic), etc.; the first material part 10111 can be a layer part, a block part, or other structural parts formed by the first material. Similarly, the second material part 10112 is formed of a second material, and the second material part 10112 includes but is not limited to a metal material (copper, iron, aluminum, etc.), or a non-metal material (such as plastic), etc.; the second material part 10112 can be a layer part, a block part, or other structural parts formed by the second material.

[0070] For example, the composite plate 1011 may be a steel-aluminum composite plate, a steel-copper composite plate, or a composite plate formed by pressing plastic and copper or aluminum.

[0071] The heat exchange plate 1012 is used to be welded with the composite plate 1011 and perform heat exchange with the composite plate 1011 to achieve heat dissipation and cooling of the interior of the box body 10 .

[0072] A partial surface of the heat exchange plate 1012 forms a second welding surface 1012a. Optionally, the heat exchange plate 1012 may be a plate structure made of aluminum alloy, copper alloy or other materials with good thermal conductivity, and the surface of the plate structure that abuts against the first welding surface 1011a and forms a weld is the second welding surface 1012a; or, the heat exchange plate 1012 may be a composite structure, such as a composite structure formed by a steel-copper composite, a steel-aluminum composite, a plastic and copper or aluminum composite.

[0073] The heat exchange plate 1012 at the second welding surface 1012a is formed of a third material, and the third material and the first material are the same material. It can be understood that the third material and the first material are the same material, which means that the main material of the third material and the first material is the same. For example, the third material and the first material can both be aluminum alloys, and no matter what type of aluminum alloy they are (that is, the metal composition or proportion in the aluminum alloy is different), they can be considered to be the same aluminum alloy material, that is, they belong to the same material. Therefore, on the basis that the third material and the first material are the same material, the melting points of the first welding surface 1011a and the second welding surface 1012a are approximately the same, so that the first welding surface 1011a and the second welding surface 1012a can form a welding connection.

[0074] It should be understood that the same materials appearing below have the same meaning as the same materials here, and the meaning of the same materials will not be repeated below.

[0075] In some specific embodiments, the first material part 10111 can be an aluminum alloy layer body formed by an aluminum alloy, the second material part 10112 can be a steel alloy layer body formed by a steel alloy, and the first welding surface 1011a is formed on the surface of the aluminum alloy layer body; the heat exchange plate 1012 is an aluminum alloy plate body, and thus, the second welding surface 1012a of the heat exchange plate 1012 is also formed by an aluminum alloy; thus, the first welding surface 1011a and the second welding surface 1012a can be welded.

[0076] In other specific embodiments, the first material part 10111 can be a copper alloy layer body formed by a copper alloy, the second material part 10112 can be a steel alloy layer body formed by a steel alloy, and the first welding surface 1011a is formed on the surface of the copper alloy layer body; the heat exchanger plate 1012 is a copper-aluminum composite plate body, the second welding surface 1012a of the heat exchanger plate 1012 is formed by a copper alloy, and the part of the heat exchanger plate 1012 except the second welding surface 1012a is formed by an aluminum alloy; thus, the first welding surface 1011a and the second welding surface 1012a can be welded.

[0077] In other specific embodiments, the first material part 10111 can be a steel alloy layer body formed of a steel alloy, the second material part 10112 can be an aluminum alloy layer body formed of an aluminum alloy, and the first welding surface 1011a is formed on the surface of the steel alloy layer body; the heat exchanger plate 1012 is a steel-aluminum composite plate body, the second welding surface 1012a of the heat exchanger plate 1012 is formed of a steel alloy, and the part of the heat exchanger plate 1012 except the second welding surface 1012a is formed of an aluminum alloy; thus, the first welding surface 1011a and the second welding surface 1012a can be welded.

[0078] The box body 10 provided in the embodiment of the present application, the bottom plate 101 of the box body 10 includes a composite plate 1011 and a heat exchange plate 1012, and the composite plate 1011 is used instead of the aluminum plate to achieve the purpose of reducing costs. At the same time, the third material used to form the second welding surface 1012a of the heat exchange plate 1012 and the first material used for the first material part 10111 of the composite plate 1011 to form the first welding surface 1011a are the same material. Therefore, the first welding surface 1011a and the second welding surface 1012a can be welded to each other to achieve the purpose of welding and fixing the heat exchange plate 1012 to the composite plate 1011, so as to improve the connection reliability of the heat exchange plate 1012. Therefore, it can effectively improve the problem of affecting the quality of the box body 10 due to the difficulty in welding the heat exchange plate 1012 and adopting bonding or fastener connection.

[0079] Please refer to Figures 2 to 6 In some embodiments, the first material includes at least one of a copper alloy or an aluminum alloy.

[0080] It can be understood that copper alloy and aluminum alloy have better thermal conductivity. Therefore, the first material includes copper alloy or aluminum alloy, which can make the first material part 10111 have better heat dissipation effect.

[0081] Among them, the third material of the heat exchange plate 1012 forming the second welding surface 1012a is the same material as the first material, therefore, the heat exchange plate 1012 at the second welding surface 1012a can be an aluminum alloy or a copper alloy; since the first welding surface 1011a and the second welding surface 1012a are made of the same material, for example, the materials of the first welding surface 1011a and the second welding surface 1012a are both aluminum alloy, the melting points of the first welding surface 1011a and the second welding surface 1012a are approximately the same, and the first welding surface 1011a and the second welding surface 1012a can form a weld.

[0082] The first material forms the first material part 10111. Optionally, the first material part 10111 may be a layer structure, for example, a partial layer in the composite plate 1011, such as one or more layers of aluminum alloy layer, copper alloy layer, etc.; or, the first material part 10111 may be a block structure, for example, a local block in any layer in the composite plate 1011, such as a local block of aluminum alloy, a local block of copper alloy, etc. embedded in the steel alloy layer in the composite plate 1011.

[0083] Please refer to Figures 4 to 6 In some embodiments, the first material portion 10111 includes a copper alloy layer or an aluminum alloy layer.

[0084] It can be understood that the composite plate is pressed from multiple materials to form a multi-layer structure, wherein the first material part 10111 can be at least one layer thereof; for example, the composite plate 1011 can be a steel-aluminum composite plate, wherein the first material part 10111 is the aluminum alloy layer in the steel-aluminum composite plate; thus, the first welding surface 1011a can be formed on the surface of the aluminum alloy layer, and the third material at the second welding surface 1012a of the heat exchange plate 1012 is also an aluminum alloy, thus, the second welding surface 1012a can be welded to the first welding surface 1011a formed by the aluminum alloy layer.

[0085] Please refer to Figures 2 to 6 In some embodiments, the second material includes a steel alloy.

[0086] It can be understood that the cost of steel alloy is lower than that of aluminum alloy or copper alloy. Therefore, the composite plate 1011 formed by combining the second material part 10112 formed by the steel alloy and the first material part 10111 formed by the aluminum alloy or the copper alloy has a lower cost than the bottom plate 101 formed by the aluminum alloy or the copper alloy. Therefore, the bottom plate 101 including the composite plate 1011 can reduce the cost of the box body 10.

[0087] The second material forms the second material part 10112. Optionally, the second material part 10112 may be a layer structure, such as a partial layer in the composite plate 1011, such as one or more layers of steel alloy layers, etc.; or, the second material part 10112 may be a block structure, such as a local block in any layer in the composite plate 1011, such as a local block of steel alloy embedded in the aluminum alloy layer in the composite plate 1011, so as to achieve the purpose of reducing costs by using steel strip aluminum.

[0088] Please refer to Figures 4 to 6 In some embodiments, the second material portion 10112 includes a steel alloy layer.

[0089] It can be understood that the composite plate 1011 is pressed from multiple materials to form a multi-layer structure, wherein the second material part 10112 can be at least one layer thereof; for example, the composite plate 1011 can be a steel-aluminum composite plate, a steel-copper composite plate, etc., wherein the second material part 10112 is a steel alloy layer in the steel-aluminum composite plate or the steel-copper composite plate; thus, by forming a steel alloy layer in the composite plate 1011 to replace the use of aluminum alloy, the cost of the composite plate 1011 can be effectively reduced, thereby effectively reducing the cost of the box 10 using the composite plate 1011.

[0090] Please refer to Figures 2 to 6 In some embodiments, the box body 10 further includes a frame 102 , and the frame 102 and the composite board 1011 are integrally formed.

[0091] The frame 102 may be an outer frame structure of the box body 10, and has a certain structural strength, providing certain protection and support for components such as the battery cells 20 in the box body 10. It can be understood that the frame 102 may include two or more side beams, and the multiple side beams are sequentially connected and enclosed to form the frame part of the frame 102. Optionally, the frame 102 may be an outer frame part in the first part 11 of the box body 10, or the frame 102 may be an outer frame part in the second part 12.

[0092] It can be understood that the frame 102 and the composite plate 1011 are integrally formed, that is, the frame 102 and the composite plate 1011 can be integrally stamped, without the need for other fixing processes such as welding and bonding. In addition, since the frame 102 and the composite plate 1011 are integrally stamped, the frame 102 and the composite plate 1011 are made of the same raw material plate through a stamping process, and thus, the material of the frame 102 and the composite plate 1011 is consistent, that is, the frame 102 is also a composite structure.

[0093] With such a configuration, the frame 102 and the composite plate 1011 are manufactured by an integrated molding process, which can reduce the welding connection operations between the frame 102 and the composite plate 1011, effectively improve the automation of production, and reduce labor costs; at the same time, since the frame 102 and the composite plate 1011 are formed by integrated stamping, the material of the frame 102 is consistent with the material of the composite plate 1011, that is, the frame 102 also adopts a composite structure, and the composite structure is used to replace the aluminum structure, which can further reduce the cost of the box 10.

[0094] Please refer to Figures 2 to 6 In some embodiments, the box body 10 also includes a frame 102, and a portion of the surface of the frame 102 forms a third welding surface (not shown in the figure). The frame 102 at the third welding surface is formed of a fourth material, and the fourth material and the first material or the second material are the same material; the third welding surface is welded to the first welding surface 1011a.

[0095] It can be understood that the third welding surface is used to contact with the first welding surface 1011 a and form a weld, so that the composite plate 1011 and the frame 102 are welded and fixed.

[0096] In some embodiments, the fourth material and the first material are the same material; optionally, the first material may be, but not limited to, aluminum alloy, copper alloy, etc., and thus, the fourth material may also be, but not limited to, aluminum alloy, copper alloy, etc. For example, the first material portion of the composite plate 1011 forming the first welding surface 1011a is formed of an aluminum alloy, and thus, the frame 102 also forms the third welding surface of the aluminum alloy material, and therefore, the third welding surface of the frame 102 can be welded to the first welding surface of the composite plate 1011 to achieve a fixed connection between the frame 102 and the composite plate 1011.

[0097] Among them, the frame 102 can be formed of the fourth material only at the third welding surface, and the frame 102 except the third welding surface can be formed of other materials, such as steel alloy, etc., so that the frame 102 also adopts a composite structure, such as a steel-aluminum composite structure or a steel-copper composite structure, and the third welding surface of the frame 102 is formed of the aluminum alloy in the composite structure. Alternatively, the frame 102 can be completely formed of the fourth material, for example, the frame 102 can be an aluminum alloy frame or a copper alloy frame, etc.

[0098] In other embodiments, the fourth material and the second material are the same material; optionally, the second material may be, but not limited to, steel alloy, plastic, etc., and thus, the fourth material may also be, but not limited to, steel alloy, plastic, etc. For example, the second material of the composite plate 1011 forming the second material portion 10112 may be a steel alloy, and thus, the frame 102 also forms the third welding surface of the steel alloy material, and therefore, the third welding surface of the frame 102 may be welded to the first welding surface 1011a of the composite plate 1011 to achieve a fixed connection between the frame 102 and the composite plate 1011.

[0099] The frame 102 may be formed of the fourth material only at the third welding surface, and the frame 102 other than the third welding surface may be formed of other materials, such as aluminum alloy, copper alloy, etc. Alternatively, the frame 102 may be completely formed of the fourth material, for example, the frame 102 may be a steel alloy frame.

[0100] Please refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, one side of the composite plate 1011 forming the first welding surface 1011a is recessed toward the other side opposite to form a first guide groove 10113 , and the heat exchange plate 1012 covers the first guide groove 10113 to form a flow channel 1013 .

[0101] It can be understood that the first guide groove 10113 is a groove structure formed on the composite plate 1011, for example, formed by stamping, bending, etc.; the number of the first guide grooves 10113 can be one or more. For example, when the number of the first guide grooves 10113 is one, the first guide groove 10113 can be coiled and distributed on the composite plate 1011, so that after the flow channel 1013 is formed in the first guide groove 10113, the cooling medium has a larger flow range, thereby effectively improving the water cooling effect.

[0102] Among them, the first guide groove 10113 is formed by a side of the composite plate 1011 forming the first welding surface 1011a being recessed toward the other opposite end side, that is, the side of the composite plate 1011 forming the first welding surface 1011a presents an inwardly recessed structure, and the other opposite end side presents an outwardly convex structure.

[0103] The heat exchange plate 1012 is connected to the composite plate 1011, for example, by brazing the first welding surface 1011a and the second welding surface 1012a. At this time, the heat exchange plate 1012 will cover the groove body part of the first guide groove 10113 and form a flow channel 1013; it can be understood that the flow channel 1013 is a relatively sealed channel structure formed by the heat exchange plate 1012 covering the first guide groove 10113. The flow channel 1013 is used for the cooling medium to pass through, and the cooling medium is used to perform heat exchange in the flow channel 1013 to achieve the purpose of cooling the battery cells 20 placed in the box 10.

[0104] In this way, one side of the composite plate 1011 forming the first welding surface 1011a is recessed toward the other end side opposite to form a first guide groove 10113, so that when the second welding surface 1012a of the heat exchange plate is welded to the first welding surface 1011a of the composite plate 1011, the heat exchange plate 1012 can be sealed in the first guide groove 10113 and form a flow channel 1013, so that the cooling medium can pass through the flow channel 1013 to cool the interior of the box body 10.

[0105] Please refer to Figures 2 to 4 as well as Figure 6 In some embodiments, the side of the composite plate 1011 forming the first welding surface 1011 a is disposed toward the battery cell 20 .

[0106] It can be understood that when one side of the composite plate 1011 forming the first welding surface 1011a is recessed toward the other end side to form the first guide groove 10113, the one side of the composite plate 1011 forming the first welding surface 1011a presents an inwardly recessed structure, and the other end side presents an outwardly convex structure.

[0107] In this embodiment, one side of the composite plate 1011 forming the first welding surface 1011a is arranged toward the battery cell 20, that is, the first welding surface 1011a is located on the inner side of the box body 10, and the second welding surface 1012a of the heat exchange plate 1012 is welded to the first welding surface 1011a of the composite plate 1011, so the heat exchange plate 1012 is also located on the inner side of the box body 10. When the cooling medium passes through the flow channel 1013, heat exchange can be formed on the battery cell 20 to achieve the purpose of cooling.

[0108] At the same time, among the two opposite side surfaces of the composite plate 1011, the other end side opposite to the side forming the first welding surface 1011a is facing away from the battery cell 20 and toward the outside of the box body 10. Therefore, the outwardly convex structure due to the formation of the first guide groove 10113 is also located outside the box body 10.

[0109] In this way, the composite plate 1011 has a convex structure formed by stamping the first guide groove 10113, which can be arranged outside the box body 10. Compared with the method of arranging the convex structure inside the box body 10, the influence of the convex structure on the internal space of the box body 10 can be effectively reduced, thereby reducing the influence on the assembly of the battery cell 20.

[0110] Please refer to Figures 2 to 5 In some embodiments, a second guide groove 10121 is formed in a depression on the heat exchange plate 1012 , and the composite plate 1011 covers the second guide groove 10121 to form a flow channel 1013 .

[0111] It can be understood that the second guide groove 10121 is a groove structure formed on the heat exchange plate 1012, for example, formed by stamping, bending, etc.; the number of the second guide grooves 10121 can be one or more. For example, when the number of the second guide grooves 10121 is one, the second guide groove 10121 can be coiled and distributed on the heat exchange plate 1012, so that after the flow channel 1013 is formed in the second guide groove 10121, the flow range of the cooling medium is increased, thereby effectively improving the water cooling effect.

[0112] The second guide groove 10121 is formed by a depression on the heat exchange plate 1012. Specifically, one side of the second welding surface 1012a formed by the heat exchange plate 1012 is depressed toward the other side opposite thereto. Thus, when the second welding surface 1012a and the first welding surface 1011a are welded and fixed together, the composite plate 1011 can cover the second guide groove 10121 and form the flow channel 1013.

[0113] With such arrangement, a second guide groove 10121 can be formed on the heat exchange plate 1012, so that when the second welding surface 1012a of the heat exchange plate 1012 and the first welding surface 1011a of the composite plate 1011 are welded, one side of the composite plate 1011 forming the first welding surface 1011a can be sealed on the second guide groove 10121 and form a flow channel 1013, so that the cooling medium in the flow channel 1013 can perform heat exchange and cooling treatment on the inside of the box body 10.

[0114] Please refer to Figures 2 to 5 In some embodiments, the side of the composite plate 1011 forming the first welding surface 1011 a is disposed away from the battery cell 20 .

[0115] It can be understood that the side of the composite plate 1011 forming the first welding surface 1011 a is arranged to face away from the battery cell 20 , that is, the first welding surface 1011 a is located outside the box body 10 .

[0116] Therefore, when the second welding surface 1012a of the heat exchange plate 1012 is welded to the first welding surface 1011a of the composite plate 1011, the heat exchange plate 1012 is also arranged on the outside of the box body 10; therefore, the convex structure formed by the heat exchange plate 1012 due to the depression to form the second guide groove 10121 is also located outside the box body 10.

[0117] In this way, the protruding structure of the heat exchange plate 1012 formed by stamping the second guide groove 10121 can be arranged outside the box body 10, which can effectively reduce the impact of the protruding structure on the internal space of the box body 10, thereby reducing the impact on the assembly of the battery cell 20.

[0118] Please refer to Figures 3 to 6 In some embodiments, the box body 10 also includes a cooling water nozzle (not shown in the figure), the cooling water nozzle includes a water nozzle connecting portion formed by a fifth material, the fifth material and the first material are the same material, and the water nozzle connecting portion is welded to the first welding surface 1011a and connected to the flow channel 1013.

[0119] The cooling water nozzle is a valve-type device; the cooling water nozzle is used to open and close the cooling medium and control the inlet and outlet water flow. The cooling water nozzle is used to connect the flow channel 1013 to control the cooling medium to flow into or out of the flow channel.

[0120] The faucet connection part is a part of the cooling faucet used for welding with the first welding surface 1011a. The faucet connection part is formed by the fifth material, and the fifth material and the first material are the same material. Therefore, on the basis that the first material can be a copper alloy or an aluminum alloy, the fifth material can also be a copper alloy or an aluminum alloy, that is, the faucet connection part can be a copper alloy material structure or an aluminum alloy material structure.

[0121] The cooling water nozzle may be connected to any part of the flow channel 1013. For example, the cooling water nozzle may be connected to the end of the flow channel 1013 so that the coolant can flow through the entire flow channel 1013. The number of cooling water nozzles may be two or more; for example, when the number of cooling water nozzles is two, the two cooling water nozzles may be connected to opposite ends of the flow channel 1013, respectively, and one cooling water nozzle is used to introduce the coolant, and the other cooling water nozzle is used to export the coolant.

[0122] In this way, the fifth material forming the water nozzle connection part and the first material forming the first welding surface 1011a are the same material, for example, both are aluminum alloy materials, and the third material forming the third welding surface is also the same material as the first material. Therefore, when performing the welding process, the water nozzle connection part of the cooling water nozzle and the second welding surface 1012a of the heat exchange plate 1012 can be welded as a whole to achieve the simultaneous welding of the cooling water nozzle and the heat exchange plate 1012 on the composite plate 1011, thereby optimizing the welding assembly process and reducing the manufacturing process of the box body 10.

[0123] Please refer to Figures 2 to 6 In some embodiments, the thickness of the first material portion 10111 is M, 0.05 mm ≤ M ≤ 3 mm. ("mm" is used instead of millimeters below)

[0124] It can be understood that the composite plate 1011 is formed by compounding a plurality of metal materials through mechanical pressure rolling, for example, it can be a two-layer or more material layer formed by rolling a first material part 10111 and a second material part 10112; in some specific embodiments, the composite plate 1011 can be rolled to form a two-layer composite structure, including a first layer structure formed by the first material part 10111 and a second layer structure formed by the second material part 10112; it can be understood that the first welding surface 1011a is formed on the surface of the first layer structure.

[0125] Among them, the thickness M of the first material part 10111 is set to be greater than or equal to 0.05mm to ensure that the first material part 10111 has sufficient thickness to meet the welding requirements with the heat exchange plate 1012; at the same time, the thickness M of the first material part 10111 is set to be less than or equal to 3mm. Under the condition of meeting the welding requirements with the first material part 10111, the thickness of the first material part 10111 is controlled not to exceed 3mm, so as to reduce the material of the first material of the first material part 10111, so that the proportion of the lower-cost second material part 10112 is larger, which can effectively reduce the cost of the composite plate 1011, and thus achieve the purpose of reducing the cost of the box body 10.

[0126] Please refer to Figures 2 to 6 In some embodiments, the thickness M of the first material portion 10111 is 0.1 mm ≤ M ≤ 1.5 mm.

[0127] It can be understood that in order to further optimize the connection strength between the composite plate 1011 and the heat exchange plate 1012, and optimize the cost of the composite plate 1011, the thickness M of the first material part 10111 is set to be greater than or equal to 0.1 mm and less than or equal to 1.5 mm, so that the strength of the welding connection between the first welding surface 1011a formed on the first material part 10111 and the second welding surface 1012a of the heat exchange plate 1012 is better, and the cost of the composite plate 1011 can be effectively controlled.

[0128] For example, in some specific embodiments, the housing 10 includes a frame 102, a composite plate 1011 and a heat exchange plate 1012, the heat exchange plate 1012 is made of an aluminum material, the composite plate 1011 includes a first material portion 10111 formed of an aluminum alloy and a second material portion 10112 formed of a steel alloy, and the first material portion 10111 can form an aluminum layer structure, and the second material portion 10112 can form a steel layer structure, that is, the composite plate 1011 is a steel-aluminum composite plate formed by rolling a steel plate and an aluminum plate, and the first welding surface 1011a is formed on the surface of the aluminum layer structure; at the same time, The frame 102 may also be made of a steel-aluminum composite plate material, whereby the frame 102 and the composite plate 1011 may be integrally stamped from the same steel-aluminum composite plate raw material, the second welding surface 1012a of the heat exchange plate 1012 is welded to the first welding surface 1011a of the composite plate 1011 to form the bottom plate 101, and the heat exchange plate 1012 and the composite plate 1011 enclose a flow channel 1013; wherein the box body 10 also includes an aluminum alloy faucet, which may be integrally welded to the first welding surface 1011a of the composite plate 1011 with the heat exchange plate 1012 to reduce the welding process.

[0129] Please refer to Figure 2 and Figure 3 In a second aspect, the present application also provides a battery 100, including a battery cell 20 and the above-mentioned box 10, wherein the battery cell 20 is accommodated in the box 10. The battery 100 adopts any of the boxes 10 described in the above-mentioned embodiments, which will not be described in detail here.

[0130] Please refer to Figure 1 and Figure 2 In a third aspect, the present application also provides an electric device, including the battery 100 as described above, and the battery 100 is used to provide electric energy. The electric device can be any electric device introduced in the above embodiment, such as a vehicle 1000, which will not be described in detail here.

[0131] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A box for accommodating a battery cell, characterized in that: The box body comprises: A bottom plate, the bottom plate includes a composite plate and a heat exchange plate, the composite plate includes a first material portion formed of a first material and a second material portion formed of a second material, a portion of the surface of the composite plate forms a first welding surface, and the first welding surface is formed by the first material portion; a portion of the surface of the heat exchange plate forms a second welding surface, the heat exchange plate at the second welding surface is formed of a third material, and the third material and the first material are the same material; the first welding surface is welded to the second welding surface.

2. The box according to claim 1, characterized in that: The first material includes at least one of a copper alloy or an aluminum alloy.

3. The box according to claim 2, characterized in that: The first material portion includes a copper alloy layer or an aluminum alloy layer.

4. The box according to any one of claims 1 to 3, characterized in that: The second material includes a steel alloy.

5. The box according to claim 4, characterized in that: The second material portion includes a steel alloy layer.

6. The box according to any one of claims 1 to 5, characterized in that: The box body also includes a frame, and the frame and the composite board are formed in one piece.

7. The box according to any one of claims 1 to 6, characterized in that: The box body also includes a frame, a portion of the surface of the frame forms a third welding surface, the frame at the third welding surface is formed of a fourth material, and the fourth material and the first material or the second material are the same material; the third welding surface is welded to the first welding surface.

8. The box according to any one of claims 1 to 7, characterized in that: The first welding surface is formed on one side of the composite plate and is recessed toward the other side opposite to form a first guide groove. The heat exchange plate is sealed on the first guide groove to form a flow channel.

9. The box according to claim 8, characterized in that: The side of the composite plate forming the first welding surface is arranged toward the battery cell.

10. The box according to any one of claims 1 to 7, characterized in that: The heat exchange plate is recessed to form a second guide groove, and the composite plate is sealed on the second guide groove to form a flow channel.

11. The box according to claim 10, characterized in that: The side of the composite plate forming the first welding surface is arranged away from the battery cell.

12. The box according to any one of claims 8 to 11, characterized in that: The housing further comprises a cooling water nozzle, wherein the cooling water nozzle comprises a water nozzle connecting portion formed of a fifth material, wherein the fifth material and the first material are the same material, and the water nozzle connecting portion is welded to the first welding surface and communicates with the flow channel.

13. The box according to any one of claims 1 to 12, characterized in that: The thickness of the first material portion is M, 0.05 mm ≤ M ≤ 3 mm.

14. The box according to claim 13, characterized in that: The thickness M of the first material portion is 0.1 mm≤M≤1.5 mm.

15. A battery, characterized in that: It comprises a battery cell and a box body as claimed in any one of claims 1 to 14, wherein the battery cell is accommodated in the box body.

16. An electrical equipment, characterized in that: Comprising the battery of claim 15, the battery being used to provide electrical energy.

Images