Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment. Relates to the technical field of batteries. The battery pack comprises a first box body and a second box body. The first box body is provided with a first cavity for accommodating the battery unit; the second box body is arranged on one side of the first box body, and the second box body is connected with the first box body; the second box body is provided with a second cavity for accommodating the electrical assembly. The second box body is an integrally-formed part. The second box body is designed into an integrally formed part, so that common welding seams and connecting points in the splicing design of the traditional box body are reduced, the strength and durability of the whole structure of the battery pack are improved, and the problem that the splicing welding part of the box body of the battery pack is easy to lose efficacy is avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0002] The battery pack housing provides physical protection for the battery cells, preventing damage from external impacts, vibrations, and other mechanical injuries.

[0003] In related technologies, the battery pack casing is often manufactured by welding aluminum alloy profiles. For some casings with complex boundary contours, it is necessary to weld multiple sections of aluminum alloy profiles together.

[0004] However, the existing enclosures have a problem with the welded joints being prone to failure. Utility Model Content

[0005] This application provides a battery pack and electrical device to solve the problem of easy failure at the welded joints of the casing.

[0006] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0007] The first housing has a first cavity for accommodating the battery cells;

[0008] The second enclosure is located on one side of the first enclosure and is connected to the first enclosure; the second enclosure has a second cavity for accommodating electrical components.

[0009] The second housing is a one-piece molded part.

[0010] In some embodiments of this application, the second housing includes a first side frame, a first crossbeam, and two second side frames; the first side frame, the first crossbeam, and the second side frames are integrally formed parts.

[0011] Along the first direction, the first frame and the first crossbeam are positioned opposite each other; along the second direction, the two second frames are positioned opposite each other.

[0012] The first frame and the first crossbeam are connected by the second frame.

[0013] The first frame, the first crossbeam, and the second frame surround each other to form the second cavity.

[0014] The first and second directions intersect.

[0015] In some embodiments of this application, the battery pack further includes a cold plate and welded components.

[0016] The first frame, the second frame, and the second housing are connected by welded parts and cold-rolled plates.

[0017] In some embodiments of this application, the battery pack further includes a liquid inlet / outlet structure, which is disposed on the side of the cold plate near the housing.

[0018] Along the first direction, the liquid inlet / outlet structure is located on the side of the first tank opposite to the second tank; the liquid inlet / outlet structure includes a first platform and a liquid inlet / outlet end.

[0019] The first platform has liquid inlet and outlet ends on the side opposite to the cold plate.

[0020] In some embodiments of this application, a connector is provided on the side of the first frame away from the first crossbeam along the first direction, and the connector is provided on the side of the cold plate close to the first housing.

[0021] The connector has an opening for the liquid inlet and outlet to pass through.

[0022] In some embodiments of this application, the connector has a connecting groove, the opening of the connecting groove faces the cold plate, and the opening communicates with the bottom of the connecting groove.

[0023] The first platform portion is located within the connecting groove.

[0024] In some embodiments of this application, the battery pack further includes a seal, and the first platform is provided with a platform groove, the opening of the platform groove facing the bottom of the connecting groove; the platform groove is provided along the circumference of the first platform.

[0025] The seal is located in the platform groove.

[0026] In some embodiments of this application, the first box includes a third side frame and two fourth side frames; along a first direction, the first side frame and the third side frame are arranged opposite to each other, and the first crossbeam is arranged between the first side frame and the third side frame.

[0027] Along the second direction, the two fourth borders are set opposite each other.

[0028] The two ends of the fourth border are connected to the second border and the third border, respectively.

[0029] The third and fourth borders surround and form the first cavity.

[0030] In some embodiments of this application, the first housing further includes a second crossbeam and a first longitudinal beam; the second crossbeam and the first longitudinal beam are located in the first cavity.

[0031] The second crossbeam extends along the second direction, and the first longitudinal beam extends along the first direction.

[0032] The two ends of the second crossbeam are used to connect the two fourth side frames; the two ends of the first longitudinal beam are used to connect the first crossbeam and the third side frame.

[0033] Secondly, embodiments of this application provide an electrical device, including a battery pack.

[0034] The battery pack and electrical device provided in this application include a first housing and a second housing. The first housing has a first cavity for accommodating battery cells; the second housing is disposed on one side of the first housing and connected to the first housing; the second housing has a second cavity for accommodating electrical components. The second housing is a one-piece molded part.

[0035] The battery pack provided in this application embodiment reduces the number of welds and connection points commonly found in traditional battery pack designs by designing the second housing as a single molded component. These areas are often potential sources of stress concentration and failure. The single-piece molding eliminates these weak areas, improving the overall structural strength and durability of the second housing and avoiding the problem of easy failure at the welded joints of the battery pack housing. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0037] Figure 1 This is a first-view structural schematic diagram of the battery pack provided in an embodiment of this application;

[0038] Figure 2 This is a second-view structural schematic diagram of the battery pack provided in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the liquid inlet / outlet structure and connector of the battery pack provided in the embodiments of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100: First box; 110: Third side frame; 120: Fourth side frame; 130: Second crossbeam; 140: First longitudinal beam;

[0042] 200: Second housing; 210: First frame; 220: First crossbeam; 230: Second frame; 240: Liquid inlet / outlet; 250: First platform; 260: Connector; 270: Seal; 280: Platform groove; 290: Fastener;

[0043] 300: Cold-rolled steel plate; 310: Welded parts.

[0044] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0045] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0046] In related technologies, the battery pack casing is made of aluminum alloy. During the manufacturing process, the casing is typically manufactured using a profile welding method. This method involves cutting prefabricated aluminum profiles into the required shapes and sizes, and then welding them together to form a complete casing structure.

[0047] Aluminum profiles are typically manufactured through an extrusion process, resulting in fixed cross-sectional shapes and dimensions. When manufacturing enclosures with complex outer shapes, it is necessary to combine profiles with different cross-sections to achieve the desired shape.

[0048] The complex shape of the box requires welding multiple sections of profiles, which means more welding processes are needed. Each weld is a potential weakness that can affect the overall strength and durability of the structure.

[0049] A weld is a region that joins two or more components by melting and resolidifying materials. Because the welding process involves high temperatures, the material in the weld area may undergo changes in its microstructure, which can lead to alterations in material properties. For example, the weld area may become more brittle or more susceptible to corrosion.

[0050] Meanwhile, welds are often areas of stress concentration, especially under dynamic loads or vibrations. Stress concentration can lead to the initiation and propagation of fatigue cracks, thereby reducing the service life of the structure.

[0051] Various defects may occur during welding, such as porosity, slag inclusions, lack of fusion, and incomplete penetration. These defects can further weaken the weld strength and may become the initiation point for cracks.

[0052] Therefore, the existing enclosures have the problem of easy failure at the welded joints.

[0053] Therefore, this application provides a battery pack and an electrical device. The battery pack includes a first housing and a second housing. The first housing has a first cavity for accommodating battery cells; the second housing is disposed on one side of the first housing and connected to the first housing; the second housing has a second cavity for accommodating electrical components. The second housing is a one-piece molded part.

[0054] The battery pack provided in this application embodiment reduces the number of welds and connection points commonly found in traditional battery pack designs by designing the second housing as a single molded component. These areas are often potential sources of stress concentration and failure. The single-piece molding eliminates these weak areas, improving the overall structural strength and durability of the second housing and avoiding the problem of easy failure at the welded joints of the battery pack housing.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0056] Firstly, referring to Figures 1 to 3 As shown, this application embodiment provides a battery pack, including:

[0057] The first housing 100 has a first cavity for accommodating battery cells;

[0058] The second enclosure 200 is disposed on one side of the first enclosure 100 and is connected to the first enclosure 100; the second enclosure 200 has a second cavity for accommodating electrical components.

[0059] The second housing 200 is a one-piece molded part.

[0060] For example, the primary function of the first housing 100 is to house the battery cells. The first housing 100 provides a space to protect and secure the battery cells, ensuring that the battery cells remain stable and safe during use.

[0061] The second enclosure 200 houses electrical components such as control circuits, sensors, and connectors. These components are responsible for the battery pack's management and monitoring functions. This second enclosure is the electrical compartment.

[0062] In electrical equipment, such as automobiles or portable devices, space is often very limited. The second cavity may need to be designed with an irregular shape to make efficient use of every inch of space. To avoid numerous weld joints in the second housing 200, it is designed as a single molded part. The second housing 200 can be a single structure manufactured using integral manufacturing processes such as casting, injection molding, or 3D printing.

[0063] The battery pack provided in this application embodiment, by designing the second housing 200 as a one-piece molded component, reduces the welds and connection points commonly found in the splicing design of the second housing 200 compared to traditional battery pack housings. These areas are often potential sources of stress concentration and failure. One-piece molding eliminates these weak areas, improving the overall structural strength and durability of the second housing 200, avoiding the problem of easy failure at the welded joints of the battery pack housing, and improving the battery pack's yield rate. Designing the second housing 200 as a one-piece molded component also effectively reduces weight.

[0064] By reducing seams and connection points, the one-piece design improves the sealing of the second enclosure 200, reduces the impact of environmental factors such as moisture and chemicals on internal components, thereby improving corrosion resistance and overall reliability.

[0065] Furthermore, the one-piece molded second housing 200 provides structural integrity and reduces material inhomogeneity and stress concentration caused by splicing and welding. This helps improve the durability and fatigue resistance of the electrical compartment.

[0066] Furthermore, the unibody design simplifies the manufacturing and assembly process, reduces sawing of rods and plates, minimizes production steps and potential manufacturing defects, and helps improve production cycle time and capacity. This not only increases production efficiency but also reduces the risk of failure due to assembly errors.

[0067] In some embodiments, the second housing 200 is a single die-cast component. The die-casting process allows for the manufacture of parts with complex shapes and high precision. This enables the second housing 200 to precisely accommodate electrical components while ensuring a good fit and installation. The die-casting process offers high production efficiency, enabling the rapid production of large quantities of parts. This helps reduce production costs and shorten production cycles.

[0068] Die-casting eliminates welds and seams in traditional spliced ​​designs. These areas are often potential sources of stress concentration and failure. By eliminating these weak points, the overall strength and durability of the second housing 200 structure are significantly improved.

[0069] Die-cast unibody parts typically have good surface quality and sealing properties, which helps prevent environmental factors such as moisture and chemicals from affecting internal electrical components, thereby improving corrosion resistance and overall reliability.

[0070] The high precision and consistency of the die-casting process reduce the likelihood of manufacturing defects, such as dimensional deviations and surface irregularities. This further reduces the risk of failure due to manufacturing defects.

[0071] In some embodiments, the second housing 200 is made of aluminum alloy. Aluminum alloy has mechanical properties such as high strength and corrosion resistance, which helps to improve the strength of the second housing 200 while achieving a lightweight design.

[0072] As one feasible implementation, the second housing 200 includes a first side frame 210, a first crossbeam 220, and two second side frames 230; the first side frame 210, the first crossbeam 220, and the second side frames 230 are integrally formed parts.

[0073] Along the first direction, the first frame 210 and the first crossbeam 220 are arranged opposite to each other; along the second direction, the two second frames 230 are arranged opposite to each other.

[0074] The first frame 210 and the first crossbeam 220 are connected by the second frame 230.

[0075] The first frame 210, the first crossbeam 220, and the second frame 230 surround each other to form the second cavity.

[0076] The first and second directions intersect.

[0077] By designing the first frame 210, the first crossbeam 220, and the second frame 230 as a single molded component, with no seams or welds between them, the integrity and strength of the overall structure of the second housing 200 are improved. This design reduces stress concentration points and lowers the risk of failure. The absence of seams also enhances the airtightness of the frame structure. This helps protect internal electrical components from environmental factors such as moisture and dust, improving corrosion resistance and overall reliability.

[0078] Meanwhile, unibody molding processes such as die casting typically offer high precision and consistency, ensuring that the dimensions and shape of each component meet design requirements. This helps improve the overall structural fit and performance. Unibody molding allows for more efficient material utilization and reduced waste. Designs can optimize material distribution based on load requirements, thereby improving performance and reducing weight.

[0079] One-piece molded parts reduce the number of components that need to be manufactured and assembled separately. This not only simplifies the manufacturing and assembly process but also reduces production costs and time.

[0080] The first frame 210 and the first crossbeam 220 are arranged opposite each other along a first direction, forming two opposite sides of the second cavity. Two second frame 230s are arranged opposite each other along a second direction, connecting the first frame 210 and the first crossbeam 220.

[0081] The first frame 210, the first crossbeam 220, and the two second frames 230 together form a closed space, namely the second cavity. This space is used to house and protect electrical components.

[0082] Among them, the first direction reference Figure 1 The direction shown in the middle X, the second direction is referenced Figure 1 The direction shown in Y.

[0083] As one feasible implementation method, refer to Figure 3 As shown, the battery pack also includes a cold plate 300 and a welded component 310.

[0084] The first frame 210, the second frame 230, and the second housing 200 are connected by a welded component 310 and a cold plate 300.

[0085] For example, the cold plate 300 is used for thermal management to help dissipate heat and maintain the battery cells and electrical components within their optimal operating temperature range. The introduction of the cold plate 300 significantly improves the thermal management capabilities of the battery pack. By effectively conducting and dissipating heat from the battery cells and electrical components, the cold plate 300 helps keep the components operating within safe temperature ranges, thereby improving system reliability and lifespan.

[0086] The material of the cold plate 300 is a thermally conductive material, such as aluminum or copper. The cold plate 300 contains internal flow channels to promote the flow of coolant.

[0087] Welding component 310 is used to connect the first frame 210, the second frame 230, and the second housing 200 to the cold plate 300 to form an integral structure. By connecting the various components to the cold plate 300 through welding component 310, an integrated frame structure is formed. This design improves the overall rigidity and stability of the battery pack structure and reduces the risk of overall failure due to the failure of a single component.

[0088] In some embodiments, the first frame 210, the second frame 230, and the second housing 200 are connected to the cold plate 300 by friction stir welding.

[0089] Friction stir welding (FSW) is a solid-state welding process used to join aluminum alloys and other materials that are difficult to weld using conventional fusion welding methods.

[0090] The working principle of friction stir welding is as follows: Friction stir welding uses a rotating, non-consumable tool consisting of a probe and a shoulder. The probe is inserted into the joint of the materials to be welded, while the shoulder contacts the material surface. The tool rotates and moves along the joint, generating frictional heat that softens the material around the probe without melting it. The softened material mixes under the stirring action of the tool, forming a continuous weld. As the tool moves, the weld solidifies behind it, forming a strong bond.

[0091] Friction stir welding (FSW) offers several advantages: The welds produced by FSW possess excellent mechanical properties and low deformation, typically eliminating the need for filler material. Because the welding process occurs in the solid state, heat input is lower, reducing the heat-affected zone and weld deformation. Furthermore, the absence of fumes, arc light, and harmful gases makes the welding process more environmentally friendly and safer.

[0092] For example, the weldment 310 can be a weld.

[0093] As one possible implementation, the battery pack also includes a liquid inlet / outlet structure, which is located on the side of the cold plate 300 near the housing.

[0094] Along the first direction, the liquid inlet / outlet structure is located on the side of the first housing 100 opposite to the second housing 200; the liquid inlet / outlet structure includes a first platform 250 and a liquid inlet / outlet end 240.

[0095] The first platform 250 has an inlet / outlet end 240 on the side opposite to the cold plate 300.

[0096] For example, the design of the inlet and outlet liquid structure helps to achieve efficient flow of coolant within the cold plate 300, ensuring that heat can be quickly conducted away from the battery cells and electrical components.

[0097] The design of the first platform 250 provides a stable foundation for supporting the inlet / outlet liquid end 240.

[0098] The inlet / outlet end 240 is located on the side of the first platform 250 away from the cold plate 300, which facilitates the entry and exit of coolant.

[0099] For battery packs requiring a compact design, placing the inlet / outlet fluid inlet / outlet structure on one side of the first housing 100 allows for better utilization of vertical space and avoids encroaching on bottom space. Side access is generally easier to access and maintain, especially when coolant changes or pipe inspections and repairs are required.

[0100] By placing the liquid inlet / outlet structure on the side, interference with the overall structure of the cold plate 300 can be reduced, maintaining its strength and integrity.

[0101] For example, if the liquid inlet / outlet structure is located on the side of the cold plate 300 away from the first housing 100, when welding the cold plate 300 and the first housing 100, due to the limitation of the liquid inlet / outlet structure, only hot melt nails can be used to connect the cold plate 300 and the first housing 100, and sealant is required for sealing.

[0102] FDS (Flow Drill Screw) is a fastener technology used to join sheet metal. FDS stands for "Flow Drill Screw," and this technology combines the advantages of hot drilling and self-tapping screws.

[0103] FDS thermoforming screws work by generating frictional heat through high-speed rotation and axial pressure, which locally softens the metal sheet. This heat allows the screw to penetrate the metal sheet without pre-drilling. After penetrating the sheet, the screw continues to rotate and self-taps, forming a strong threaded connection within the sheet.

[0104] Connecting the cold plate 300 and the first housing 100 by friction stir welding eliminates the need for adhesive application, improving production efficiency and reducing costs compared to using FDS hot melt studs. Furthermore, hot melt studs involve localized melting of the material, which can lead to welding defects such as porosity and deformation of the heat-affected zone.

[0105] As one feasible implementation, a connector 260 is provided on the side of the first frame 210 away from the first crossbeam 220 along the first direction, and the connector 260 is provided on the side of the cold plate 300 close to the first housing 100.

[0106] The connector 260 is provided with an opening for the liquid inlet / outlet end 240 to pass through.

[0107] For example, by providing an opening in the connector 260, a tight integration of the inlet / outlet structure with the battery pack can be achieved, reducing the complexity of external piping. The opening design also facilitates the installation and removal of the inlet / outlet structure when maintenance or replacement is required.

[0108] By placing the opening on the connector 260, rather than directly on the cold plate 300 or the housing, the structural integrity of the cold plate 300 and the second housing 200 can be maintained, and potential weaknesses caused by the opening can be reduced.

[0109] As one feasible implementation, the connector 260 has a connecting groove with the opening facing the cold plate 300 and the opening communicating with the bottom of the connecting groove.

[0110] Part of the first platform 250 is located in the connecting groove.

[0111] For example, connector 260 has a connecting groove with its opening facing the cold plate 300. This design allows the connecting groove to fit snugly with the cold plate 300, providing a stable mounting base.

[0112] The bottom of the connecting groove is connected to the opening, which means that the liquid inlet / outlet structure can be directly inserted into the connecting groove through the opening, thereby enabling the rapid installation of the liquid inlet / outlet structure.

[0113] Part of the first platform 250 is located in the connecting groove. This design ensures a tight fit between the first platform 250 and the connector 260, providing additional support and stability.

[0114] The connecting groove provides a natural positioning and fixing point, ensuring a secure connection between the first platform 250 and the connector 260. This design simplifies the assembly process because the first platform 250 can be directly inserted into the connecting groove without the need for additional fixing devices.

[0115] The first platform 250 is connected by fasteners 290 and connectors 260. The fasteners can be bolts or screws.

[0116] As one possible implementation, the battery pack also includes a seal 270, and the first platform 250 is provided with a platform groove 280, the opening of the platform groove 280 facing the bottom of the connecting groove; the platform groove 280 is arranged along the circumference of the first platform 250.

[0117] The seal 270 is disposed in the platform groove 280.

[0118] For example, a platform groove 280 is disposed on the first platform 250, with its opening facing the bottom of the connecting groove. This design ensures that the seal 270 can be effectively embedded in the platform groove 280, providing a stable sealing effect.

[0119] The platform groove 280 is arranged circumferentially along the first platform 250 to ensure that the seal 270 can provide a consistent sealing performance throughout the circumference.

[0120] The seal 270, located in the platform recess 280, effectively prevents external environmental factors such as moisture, dust, and chemicals from entering the battery pack, protecting the battery cells and electrical components. In addition to its sealing function, the seal 270 also provides some shock absorption and cushioning, helping to absorb mechanical vibrations and impacts.

[0121] For example, the seal 270 includes an O-ring, a foam sealing strip, and a sealing gasket.

[0122] O-rings are made of materials including rubber, silicone, and fluororubber.

[0123] The materials used for foam sealing strips include foam rubber or polyurethane.

[0124] As one feasible implementation, the first housing 100 includes a third side frame 110 and two fourth side frames 120; along a first direction, the first side frame 210 and the third side frame 110 are arranged opposite to each other, and the first crossbeam 220 is disposed between the first side frame 210 and the third side frame 110.

[0125] Along the second direction, the two fourth borders are set opposite each other at 120.

[0126] The two ends of the fourth border 120 are connected to the second border 230 and the third border 110, respectively.

[0127] The third border 110 and the fourth border 120 surround each other to form the first cavity.

[0128] For example, a boundary of the first cavity is provided opposite to the first frame 210. Two fourth frame 120s are disposed opposite to each other along a second direction, connecting between the second frame 230 and the third frame 110, forming the sidewalls of the first cavity.

[0129] The first frame 210 and the third frame 110 are arranged opposite to each other, and the first crossbeam 220 connects the two frames, providing lateral support and stability to the structure. The two fourth frames 120 are arranged opposite to each other, forming the longitudinal boundary of the first cavity, and together with the third frame 110, they surround the first cavity to form a complete first cavity.

[0130] This frame structure provides mechanical strength and stability through the combination of multiple frame elements, effectively protecting the internal battery cells. The combination of these frame elements also gives the design a modular character, facilitating manufacturing and assembly.

[0131] As one possible implementation, the first housing 100 also includes a second crossbeam 130 and a first longitudinal beam 140; the second crossbeam 130 and the first longitudinal beam 140 are located in the first cavity.

[0132] The second crossbeam 130 extends along the second direction, and the first longitudinal beam 140 extends along the first direction.

[0133] The two ends of the second crossbeam 130 are used to connect the two fourth side frames 120; the two ends of the first longitudinal beam 140 are used to connect the first crossbeam 220 and the third side frame 110.

[0134] For example, the second crossbeam 130 is located within the first cavity and extends along the second direction. Its primary function is to provide additional lateral support and stability.

[0135] The first longitudinal beam 140 is also located within the first cavity, extending along the first direction to provide longitudinal support and stability.

[0136] The two ends of the second crossbeam 130 are connected to the two fourth frame frames 120. This connection method ensures the stability of the crossbeam in the lateral direction and provides additional structural support for the first cavity.

[0137] The first longitudinal beam 140 is connected at both ends to the first transverse beam 220 and the third frame 110, respectively. This design provides longitudinal support and integrates the different frame components into a whole, enhancing the structural integrity.

[0138] By adding the second crossbeam 130 and the first longitudinal beam 140, the overall rigidity and strength of the first cavity are significantly improved, enabling it to better resist external impacts and vibrations.

[0139] Secondly, embodiments of this application provide an electrical device, including a battery pack.

[0140] It is understood that since the electrical equipment of this application adopts the technical solution of the battery pack of the above embodiments, it has at least the beneficial effects brought about by the technical solution of the above embodiments, which will not be described in detail here.

[0141] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0142] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: A first housing (100) has a first cavity for accommodating a battery cell; A second enclosure (200) is disposed on one side of the first enclosure (100), and the second enclosure (200) is connected to the first enclosure (100); the second enclosure (200) has a second cavity for accommodating electrical components; The second housing (200) is a one-piece molded part.

2. The battery pack according to claim 1, characterized in that, The second box (200) includes a first side frame (210), a first crossbeam (220), and two second side frames (230); the first side frame (210), the first crossbeam (220), and the second side frames (230) are integrally formed parts; Along a first direction, the first frame (210) and the first crossbeam (220) are arranged opposite to each other; along a second direction, the two second frame (230) are arranged opposite to each other; The first frame (210) and the first crossbeam (220) are connected by the second frame (230); The first frame (210), the first crossbeam (220), and the second frame (230) surround each other to form the second cavity; the first direction and the second direction intersect.

3. The battery pack according to claim 2, characterized in that, It also includes cold-rolled steel plate (300) and welded components (310); The first frame (210), the second frame (230), and the second housing (200) are connected by the welded part (310) and the cold plate (300).

4. The battery pack according to claim 3, characterized in that, It also includes a liquid inlet / outlet structure, which is disposed on the side of the cold plate (300) near the housing; Along the first direction, the liquid inlet / outlet structure is disposed on the side of the first housing (100) opposite to the second housing (200); the liquid inlet / outlet structure includes a first platform (250) and a liquid inlet / outlet end (240); The first platform (250) is provided with the liquid inlet / outlet end (240) on the side opposite to the cold plate (300).

5. The battery pack according to claim 4, characterized in that, Along the first direction, a connector (260) is provided on the side of the first frame (210) away from the first crossbeam (220), and the connector (260) is provided on the side of the cold plate (300) close to the first housing (100); The connector (260) is provided with an opening for the liquid inlet / outlet end (240) to pass through.

6. The battery pack according to claim 5, characterized in that, The connector (260) has a connecting groove, the opening of which faces the cold plate (300), and the opening communicates with the bottom of the connecting groove; A portion of the first platform (250) is located in the connecting groove.

7. The battery pack according to claim 6, characterized in that, It also includes a sealing element (270), the first platform (250) is provided with a platform groove (280), the groove opening of the platform groove (280) faces the bottom of the connecting groove; the platform groove (280) is arranged along the circumference of the first platform (250); the sealing element (270) is disposed in the platform groove (280).

8. The battery pack according to any one of claims 2-7, characterized in that, The first box (100) includes a third side frame (110) and two fourth side frames (120); along the first direction, the first side frame (210) and the third side frame (110) are arranged opposite to each other, and the first crossbeam (220) is arranged between the first side frame (210) and the third side frame (110); Along the second direction, the two fourth borders (120) are arranged opposite to each other; The two ends of the fourth border (120) are respectively connected to the second border (230) and the third border (110); The third border (110) and the fourth border (120) surround and form the first cavity.

9. The battery pack according to claim 8, characterized in that, The first housing (100) further includes a second crossbeam (130) and a first longitudinal beam (140); the second crossbeam (130) and the first longitudinal beam (140) are located in the first cavity; The second crossbeam (130) extends along the second direction, and the first longitudinal beam (140) extends along the first direction; The two ends of the second crossbeam (130) are used to connect the two fourth side frames (120); the two ends of the first longitudinal beam (140) are used to connect the first crossbeam (220) and the third side frame (110).

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1-9.

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