Battery box, battery and electric device

Abstract

The utility model relates to battery box technical field, specifically disclose a battery box, battery and electric device. The box body includes box main body, heat dissipation bottom plate, fixed frame and a plurality of first locking piece, fixed frame is used for battery box body and external fixed mounting, heat dissipation bottom plate includes board main body, and the edge circumferential of board main body is equipped with the upwards bending part, and board main body and bending part enclose the bottom plate recess, and the edge circumferential of bottom plate recess opening is equipped with the bottom plate flanging that turns outwardly, and bottom plate flanging is set up in fixed frame, the bottom opening of box main body is covered and is set in bottom plate flanging, and heat dissipation bottom plate and box main body enclose the accommodation cavity for receiving battery module, and first locking piece fastens and connects bottom plate flanging, fixed frame and box main body, and the material of heat dissipation bottom plate and box main body is different, and the heat conductivity coefficient of heat dissipation bottom plate is higher than the heat conductivity coefficient of box main body, and / or the density of box main body is less than the density of heat dissipation bottom plate. The box body carries out functional modularization design, and the weight reduction and / or heat dissipation purpose are realized as needed.

Description

Technical Field

[0001] This utility model relates to the field of battery box technology, and in particular to a battery box body, a battery, and an electrical device. Background Technology

[0002] With the rapid development of electric vertical takeoff and landing (eVTOL) technology, high-energy-density, high-safety, and high-reliability power battery systems have become a key support for its development. Lithium-ion batteries, due to their high energy density and mature manufacturing processes, have been widely used in eVTOL power systems. However, the aerospace industry has placed extremely stringent demands on the lightweight design and thermal management performance of battery systems. Traditional integrated enclosure structures often have significant shortcomings in terms of heat dissipation efficiency and weight control, making it difficult to simultaneously optimize these two aspects. This has become a major technical bottleneck in improving the overall performance of eVTOLs.

[0003] Currently, most common battery enclosures are made of a single material, which presents a significant contradiction in structural design and material selection. If heat dissipation performance is emphasized, metal materials such as aluminum alloys are usually introduced as heat dissipation structures. However, these materials have a high density, which will lead to a significant increase in the overall weight of the enclosure, making it difficult to meet the requirements of aircraft for high energy density and extreme lightweight. Conversely, if lightweight non-metallic materials (such as composite materials or engineering plastics) are selected to reduce weight, their thermal conductivity is usually poor, making it difficult to build an effective heat dissipation path. The heat generated by the battery module during charging and discharging cannot be dissipated in time, which can easily lead to heat accumulation or even thermal runaway, seriously affecting battery life and flight safety.

[0004] Furthermore, eVTOL operates in a complex environment. During flight, it relies on passive cooling through airflow, while on the ground, it may require auxiliary temperature control equipment for thermal management. Traditional enclosures, due to material and structural limitations, often struggle to adapt to both cooling scenarios simultaneously and lack a systematic thermal management interface design, thus limiting their feasibility for aerospace applications.

[0005] On the other hand, as the supporting and protective structure for the battery modules, the mechanical strength, installation reliability, and failure protection capabilities of the battery enclosure are equally crucial. Especially in aerospace applications, any structural failure can have serious consequences. Traditional integrated or simply assembled enclosure structures often fail to integrate multiple mechanical protection and heat dissipation functions while achieving lightweight design, posing risks such as detachment at high altitudes and connection failures. Utility Model Content

[0006] The purpose of this utility model is to provide a battery box, battery and power device with modular design to achieve weight reduction and / or heat dissipation as needed.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A battery enclosure includes a fixed frame, a heat dissipation base plate, a main body, and several first locking members. The fixed frame is used for fixed installation of the battery enclosure to the outside. The heat dissipation base plate includes a main body with an upwardly bent portion on the circumferential edge of the main body. The main body and the bent portion form a base plate groove. The edge of the opening of the base plate groove has an outwardly folded base plate flange, which rests on the fixed frame. The bottom of the main body has an opening, and the main body covers the base plate flange. The heat dissipation base plate and the main body form a cavity for housing a battery module. The first locking members securely connect the base plate flange, the fixed frame, and the main body. The heat dissipation base plate and the main body are made of different materials, with the heat dissipation base plate having a higher thermal conductivity than the main body, and / or the density of the main body being lower than the density of the heat dissipation base plate.

[0009] As an optional technical solution for the battery box, the bottom surface of the fixed frame is coplanar with the bottom surface of the main body of the plate.

[0010] As an optional technical solution for the battery housing, the heat dissipation base plate is made of a thermally conductive material.

[0011] As an optional technical solution for the battery housing, the thermally conductive material is aluminum alloy.

[0012] As an optional technical solution for the battery enclosure, the material of the enclosure body and / or the material of the fixed frame is carbon fiber.

[0013] As an optional technical solution for the battery box, the bottom opening edge of the box body is provided with an inwardly folded first main body flange, the bottom plate flange is sandwiched between the fixed frame and the first main body flange, and the first locking member securely connects the bottom plate flange, the fixed frame and the first main body flange.

[0014] As an optional technical solution for the battery box, the box body includes a box wall and a box cover that are set separately. The box wall has openings at the top and bottom. The top opening edge of the box wall has a second main body flange that folds inward. The box cover is fastened to the second main body flange by a second locking member and seals the top opening.

[0015] As an optional technical solution for the battery box, the bottom of the groove of the base plate is provided with several partition ribs at intervals to divide the groove of the base plate into multiple battery placement areas.

[0016] A battery includes a battery module and the aforementioned battery housing, wherein the battery module is disposed within the battery housing.

[0017] An electrical device includes a housing and the aforementioned battery, wherein the fixed frame is fixedly attached to the housing.

[0018] As an optional technical solution for the electrical device, the bottom surface of the fixed frame, the bottom surface of the main plate body, and the bottom surface of the equipment housing are located in the same plane.

[0019] The beneficial effects of this utility model are:

[0020] This battery enclosure employs a modular, split design, dividing it into three main components: a fixed frame, a heat dissipation base plate, and a main body. These three components are secured together using a first locking mechanism. Furthermore, materials are selected based on the functional differences of each component, achieving multiple beneficial effects. First, the heat dissipation base plate is made of a different material than the main body, with the base plate using a material with high thermal conductivity. This optimizes the heat conduction path, making it a highly efficient heat dissipation interface. Heat generated by the battery modules can be quickly dissipated, utilizing passive cooling through air convection during flight and active temperature control with external equipment on the ground, significantly improving thermal management efficiency. Second, the main body is manufactured using low-density, lightweight materials, effectively reducing the overall weight of the battery enclosure and achieving extreme lightweighting, which helps increase the energy density of the battery. This "material selection on demand" resolves the contradiction that traditional single materials cannot simultaneously meet the requirements of efficient heat dissipation and structural lightweighting. It achieves functional specialization and optimized material configuration, thereby achieving weight reduction while meeting strength, rigidity, and installation stress requirements. Moreover, it allows designers to prioritize core functions based on the specific application scenario. For priority given to heat dissipation, a high thermal conductivity base plate paired with a standard housing can be selected; for priority given to weight reduction, a low-density housing paired with a standard base plate can be selected; if both are required, a combined solution can be adopted. This modular design achieves functional modularity, greatly improving the adaptability and optimization space of product design. In addition, the modular design reduces the processing complexity and molding difficulty of each individual component, reduces material waste and scrap rate, thereby improving production yield and efficiency, simplifying the manufacturing process and reducing production costs. The heat dissipation base plate is firmly connected to the housing body through the first locking component. This design ensures that even if the first locking component fails unexpectedly, the fixed frame will support the flipped edge of the base plate, providing secondary protection through mechanical limiting, preventing the battery module from falling out of the battery housing, effectively avoiding the risk of objects falling from heights, and providing reliability and safety for the application.

[0021] This battery integrates a battery housing with outstanding advantages such as light weight, good heat dissipation, safety and reliability, and suitability for aviation applications. This results in a battery with higher energy density, better thermal management performance and safety, making it particularly suitable for airborne power scenarios with stringent requirements for weight and thermal management. This significantly improves the overall performance and market competitiveness of the battery product.

[0022] This power device integrates a battery with advantages such as lightweight, high strength, efficient heat dissipation, and high safety into its structural components, simplifying the overall assembly process, directly reducing the overall weight of the power device, and improving its safety factor, range, and overall performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery box structure provided in an embodiment of the present utility model;

[0024] Figure 2 This is an exploded view of the battery box provided in an embodiment of this utility model;

[0025] Figure 3 This is a cross-sectional view of the battery box provided in an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 A magnified view of part A in the image.

[0027] In the picture:

[0028] 100. Fixed frame; 101. Through hole;

[0029] 200. Heat dissipation base plate; 201. Plate body; 202. Bending section; 203. Base plate flange; 204. Base plate groove; 210. Separating rib;

[0030] 300. Container body; 301. Protective groove; 310. Container wall; 311. First main body flange; 312. Second main body flange; 320. Container lid;

[0031] 400. First locking element. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] like Figures 1 to 4As shown, this embodiment provides a battery box, including a fixed frame 100, a heat dissipation base plate 200, a box body 300, and several first locking members 400; the fixed frame 100 is used for fixed installation of the battery box to the outside; the heat dissipation base plate 200 includes a plate body 201, the edge of the plate body 201 is provided with an upward bending portion 202, the plate body 201 and the bending portion 202 form a bottom plate groove 204, the edge of the opening of the bottom plate groove 204 is provided with an outwardly folded bottom plate flange 203, the bottom plate flange 203 is attached to the fixed frame 100; the bottom of the box body 300 has an opening, the box body 300 is covered on the bottom plate flange 203, the heat dissipation base plate 200 and the box body 300 form a receiving cavity for storing battery modules; the first locking members 400 fasten the bottom plate flange 203, the fixed frame 100 and the box body 300 together; the heat dissipation base plate 200 and the box body 300 are made of different materials. In one embodiment of this invention, the thermal conductivity of the heat dissipation base plate 200 is higher than that of the box body 300; and the density of the box body 300 is less than that of the heat dissipation base plate 200.

[0037] The battery housing employs a modular, split design, dividing it into three main components: a fixed frame 100, a heat dissipation base plate 200, and a main body 300. These three components are secured together using a first locking element 400. Furthermore, materials are selected based on the functional differences of each component, achieving multiple beneficial effects. First, the heat dissipation base plate 200 and the main body 300 are made of different materials, with the base plate 200 using a material with high thermal conductivity. This optimizes the heat conduction path, making it a highly efficient heat dissipation interface. Heat generated by the battery module can be quickly dissipated, utilizing air convection for passive cooling during flight and enabling active temperature control with external equipment on the ground, significantly improving thermal management efficiency. Second, the main body 300 is manufactured using a low-density, lightweight material, effectively reducing the overall weight of the battery housing and achieving extreme lightweighting, which helps improve the energy density of the battery housing. This "material selection on demand" resolves the contradiction that traditional single materials cannot simultaneously meet the requirements of efficient heat dissipation and structural lightweighting. It achieves functional specialization and optimized material configuration, thereby achieving weight reduction while meeting strength, rigidity, and installation stress requirements. Moreover, it allows designers to prioritize core functions based on the specific application scenario. For example, a high thermal conductivity base plate paired with a standard housing can be chosen if heat dissipation is a priority; a low-density housing paired with a standard base plate can be selected if weight reduction is a priority; and a combination solution can be used if both are required. This modular design achieves functional modularity, greatly enhancing the adaptability and optimization space of product design. Furthermore, the modular design reduces the processing complexity and molding difficulty of each individual component, reducing material waste and scrap rates, thereby improving production yield and efficiency, simplifying manufacturing processes, and reducing production costs. The heat dissipation base plate 200 is securely connected to the housing body 300 via the first locking member 400. This design ensures that even if the first locking member 400 fails unexpectedly, the fixed frame 100 will support the base plate flange 203, providing secondary protection through mechanical limiting to prevent the battery module from detaching from the battery housing, effectively mitigating the risk of objects falling from heights and providing reliability and safety for the application.

[0038] In another embodiment of this invention, the thermal conductivity of the heat dissipation base plate 200 is limited to being higher than that of the main body 300; in yet another embodiment of this invention, the density of the main body 300 is limited to being lower than that of the heat dissipation base plate 200.

[0039] Specifically, the main body 300 has a protective groove 301, the opening of the main body 300 is the top of the protective groove 301, and the groove wall of the protective groove 301 and the groove wall of the bottom plate groove 204 form a receiving cavity for storing the battery module; the fixed frame 100 has a through hole 101, and the main body 201 and part of the bent part 202 are placed in the through hole 101; the first locking member 400 passes through the fixed frame 100 and the bottom plate flange 203, and is fixed to the main body 300; the bottom of the battery module is fitted into the bottom plate groove 204.

[0040] In this embodiment, the bottom surface of the fixed frame 100 is coplanar with the bottom surface of the plate body 201.

[0041] The coplanar design creates a flat surface at the bottom of the battery compartment, allowing a large area of ​​the bottom surface of the main body 201 to be exposed and directly exchange heat with the ambient air. This significantly improves heat dissipation efficiency and also helps reduce air resistance during flight, optimizing the overall aerodynamic performance and meeting aerodynamic requirements.

[0042] For example, the heat dissipation base plate 200 is made of a thermally conductive material.

[0043] The heat dissipation base plate 200 uses thermally conductive materials to ensure its core heat conduction and heat dissipation functions are guaranteed. It provides a basic guarantee for the rapid heat dissipation of the battery module or the heat introduction of external thermal management, and is the foundation and key to realizing efficient active and passive thermal management functions.

[0044] Furthermore, the thermally conductive material is an aluminum alloy.

[0045] Aluminum alloys have excellent thermal conductivity, certain structural strength, and relatively light weight, making them one of the ideal choices for balancing heat dissipation and lightweight requirements. The processing technology is mature, ensuring thermal management efficiency while taking into account structural requirements and economy, achieving the best balance between performance and cost.

[0046] In one embodiment of this invention, the materials of the box body 300 and the fixed frame 100 are carbon fiber materials.

[0047] Carbon fiber materials possess extremely high specific strength and specific modulus. Using carbon fiber to manufacture the battery box body 300 and the fixed frame 100 fully leverages its extreme lightweight advantage, significantly reducing component weight and thus greatly reducing the overall mass of the battery box, improving its load-bearing capacity and range. Using it in the battery box body 300 achieves effective weight reduction and provides protection, while using it in the fixed frame 100 ensures the connection strength and overall stability of its main load-bearing structure, achieving an optimal match between function and material properties. Carbon fiber composite materials possess excellent mechanical properties, sufficient to meet the strength and stiffness requirements of the battery box's structural components, achieving optimized material configuration and equal strength design.

[0048] In another embodiment of this example, only the material of the main body 300 is limited to carbon fiber; in yet another embodiment of this example, only the material of the fixed frame 100 is limited to carbon fiber.

[0049] For example, the bottom opening edge of the box body 300 is provided with an inwardly folded first main body flange 311, the bottom plate flange 203 is sandwiched between the fixed frame 100 and the first main body flange 311, and the first locking member 400 fastens the bottom plate flange 203, the fixed frame 100 and the first main body flange 311 together.

[0050] By setting the first main body flange 311, the material thickness and contact area at the connection between the main body 300 and the first locking member 400 are increased, which allows the tension of the first locking member 400 to be transmitted more effectively to the side wall of the main body 300, making the locking force distribution more uniform, improving the local stress concentration, and further improving the mechanical interlocking effect. This significantly enhances the connection strength and overall structural stability between the main body 300 and the heat dissipation base plate 200 and the fixed frame 100, and improves the overall durability and reliability of the battery box.

[0051] In this embodiment, the main body 300 includes a separate box wall 310 and a box cover 320. The box wall 310 has openings at both the top and bottom. The top opening edge of the box wall 310 has a second main body flange 312 that folds inward. The box cover 320 is fastened to the second main body flange 312 by a second locking member and seals the top opening.

[0052] The split design greatly simplifies the manufacturing process of both the enclosure wall 310 and the cover 320, reduces processing difficulty, and facilitates the installation, inspection, and maintenance of the battery module, simplifying manufacturing and simplifying maintenance. The second main flange 312 at the top of the enclosure wall 310 is connected to the cover 320 via a second locking component, forming a strong and uniform locking force. This ensures the tightness of the connection between the cover 320 and the enclosure wall 310, guaranteeing the tightness of the connection and structural rigidity, and improving the sealing, dustproof, and waterproof performance of the battery enclosure. The circumferential flange structure acts like a hoop, effectively suppressing enclosure deformation and improving the overall structural rigidity and stability. The cover 320 focuses on sealing and top protection, while the enclosure wall 310 focuses on providing structural space and mounting surfaces. The clear functional division facilitates optimized design. The split structure of the enclosure wall 310 and cover 320 facilitates the installation, debugging, and maintenance of internal components such as the battery module, BMS (Battery Management System), and connectors.

[0053] For example, the bottom of the base plate groove 204 is provided with a number of partition ribs 210 at intervals to divide the base plate groove 204 into multiple battery placement areas.

[0054] By setting partition ribs 210 at the bottom of the base plate groove 204, the accommodating cavity is divided into multiple independent battery compartments for precise positioning and fixing of individual battery components, preventing them from shifting or colliding during transportation or use, thus improving overall stability and reliability. The partition ribs 210 also act as reinforcing ribs, significantly enhancing the structural rigidity and deformation resistance of the heat dissipation base plate 200 and the entire bottom of the battery box, enabling it to better withstand the weight of the battery modules and loads during flight. Simultaneously, the partition ribs 210 provide clear positioning and installation space for each battery component, helping to organize the battery component layout, ensuring smooth heat dissipation airflow channels and heat conduction paths, thereby guiding and evenly distributing heat, avoiding localized heat accumulation, improving heat dissipation uniformity, and enhancing overall heat dissipation efficiency.

[0055] For example, the thickness of the fixed frame 100 is greater than the wall thickness of the box body 300. Specifically, the thickness of the fixed frame 100 is 2.8 mm to 3.2 mm, and the wall thickness of the box body 300 is 0.8 mm to 1.2 mm.

[0056] The fixed frame 100, as the main load-bearing structure connecting to external devices, bears the weight of the entire battery module and the inertial forces during flight. Ensuring its thickness significantly improves connection strength and overall structural stability, ensuring the load of the entire battery housing can be safely and reliably transferred to external devices. The main body 300 primarily protects and supports lighter components; reducing its thickness minimizes weight, achieving the ultimate lightweight goal by using materials where they are most needed while ensuring safety. The thickness is designed differently based on the stress on the components. Thinner materials are used in non-primary load-bearing areas (i.e., the main body 300) to reduce weight, while increased thickness is used in critical load-bearing areas (i.e., the fixed frame 100) to ensure safety, achieving optimized material allocation and equal strength design of the structure.

[0057] This embodiment also provides a battery, including a battery module and the aforementioned battery housing, with the battery module disposed within the battery housing.

[0058] This battery integrates a battery housing with outstanding advantages such as light weight, good heat dissipation, safety and reliability, and suitability for aviation applications. This results in a battery with higher energy density, better thermal management performance and safety, making it particularly suitable for airborne power scenarios with stringent requirements for weight and thermal management. This significantly improves the overall performance and market competitiveness of the battery product.

[0059] This embodiment also provides an electrical device, including a device housing and the aforementioned battery, with a fixed frame 100 fixedly attached to the device housing.

[0060] This power device integrates a battery with advantages such as lightweight, high strength, efficient heat dissipation, and high safety into its structural components, simplifying the overall assembly process, directly reducing the overall weight of the power device, and improving its safety factor, range, and overall performance.

[0061] In this embodiment, the bottom surface of the fixed frame 100, the bottom surface of the plate body 201, and the bottom surface of the equipment housing are located in the same plane.

[0062] By defining the coplanar relationship between the bottom surface of the battery housing and the bottom surface of the electrical device housing, the bottom surfaces of the battery housing and the electrical device housing are ensured to be flush, forming a smooth and streamlined overall shape. This effectively reduces air resistance during flight, avoids the adverse effects of protruding uneven structures on aerodynamic performance, and optimizes the aerodynamic performance of the electrical device. These limitations also allow the battery to be perfectly integrated into the overall structure of the electrical device, resulting in a clean appearance, higher integration, and a more streamlined design.

[0063] In this embodiment, the electrical device further includes several third locking members; the fixed frame 100 is divided into an inner ring area and an outer ring area, the outer ring area is circumferentially located outside the inner ring area, the first locking member 400 passes through the inner ring area, and the third locking member passes through the outer ring area and is fixed to the device housing.

[0064] The locking function of the fixed frame 100 is divided into inner and outer zones. The inner zone, through the first locking member 400, connects the heat dissipation base plate 200 and the main body 300, forming a robust whole for the battery box. The outer zone, through the third locking member, independently secures the entire battery box to the equipment housing. This zoned design makes the force transmission path clearer and more rational, avoids interference between locking members with different functions, and enhances the stability and reliability of the connection. These improvements also contribute to the distribution of connection points in the outer zone, improving the overall rigidity and reliability of the connection between the electrical device and the battery, and enabling it to withstand complex flight loads.

[0065] For example, the main body 300 is provided with a connection port, the battery module is electrically connected to the connection port, and the electrical device is selectively electrically connected to the connection port.

[0066] Integrated connection ports facilitate quick and reliable plug-and-play connections between battery modules and electrical devices, enabling devices to quickly connect and obtain power. They also facilitate the integration of charging interfaces, thereby meeting the high requirements of electrical devices for interface reliability and ease of operation. This makes it easier and faster to power on and off the battery module and replace the entire battery module, while also simplifying the assembly and maintenance process and improving the modularity and versatility of the electrical device design.

[0067] In this embodiment, the first locking member 400, the second locking member, and the third locking member are rivets. Specifically, the rivets are made of aluminum alloy. Of course, stainless steel or other metals can also be used. The selection of the rivet material is determined by those skilled in the art based on the actual engineering situation, and the method of determination is common knowledge in the art. The specific material of the rivet is not the focus of this application and will not be elaborated here.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery housing, characterized in that, include: Fixed frame (100) is used for fixed installation of the battery box to the outside; The heat dissipation base plate (200) includes a plate body (201), the edge of the plate body (201) is provided with an upward bending part (202) in the circumferential direction, the plate body (201) and the bending part (202) form a base plate groove (204), the edge of the opening of the base plate groove (204) is provided with an outwardly folded base plate flange (203), and the base plate flange (203) is attached to the fixed frame (100); The main body (300) has an opening at the bottom. The main body (300) is covered on the flange (203) of the bottom plate. The heat dissipation bottom plate (200) and the main body (300) form a cavity for storing the battery module. A plurality of first locking members (400) securely connect the bottom plate flange (203), the fixed frame (100) and the box body (300); The heat dissipation base plate (200) is made of a different material than the main body of the box (300). The thermal conductivity of the heat dissipation base plate (200) is higher than that of the main body of the box (300); and / or the density of the main body of the box (300) is lower than that of the heat dissipation base plate (200).

2. The battery housing according to claim 1, characterized in that, The bottom surface of the fixed frame (100) is coplanar with the bottom surface of the main body (201).

3. The battery housing according to claim 1, characterized in that, The heat dissipation base plate (200) is made of a thermally conductive material.

4. The battery housing according to claim 3, characterized in that, The thermally conductive material is an aluminum alloy.

5. The battery housing according to claim 1, characterized in that, The material of the main body of the box (300) and / or the material of the fixed frame (100) is carbon fiber.

6. The battery housing according to claim 1, characterized in that, The bottom opening edge of the box body (300) is provided with an inwardly folded first main body flange (311). The bottom plate flange (203) is sandwiched between the fixed frame (100) and the first main body flange (311). The first locking member (400) fastens the bottom plate flange (203), the fixed frame (100) and the first main body flange (311) together.

7. The battery housing according to any one of claims 1-6, characterized in that, The main body of the box (300) includes a box wall (310) and a box cover (320) that are separately set. The box wall (310) has openings at both the top and bottom. The top opening edge of the box wall (310) is provided with a second main body flange (312) that folds inward. The box cover (320) is fastened to the second main body flange (312) by a second locking member and seals the top opening.

8. The battery housing according to any one of claims 1-6, characterized in that, The bottom of the base plate groove (204) is provided with several partition ribs (210) at intervals, which divide the base plate groove (204) into multiple battery placement areas.

9. A battery, characterized in that, It includes a battery module and a battery housing as described in any one of claims 1-8, wherein the battery module is disposed within the battery housing.

10. An electrical device, characterized in that, Includes a device housing and the battery as described in claim 9, wherein the fixed frame (100) is fixed to the device housing.

11. The electrical appliance according to claim 10, characterized in that, The bottom surface of the fixed frame (100), the bottom surface of the plate body (201), and the bottom surface of the equipment housing are located in the same plane.

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