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 box body, a battery module and a heat insulation piece, the box body has an accommodating cavity; a groove is formed in the box body, and a groove opening of the groove faces the containing cavity. The battery module is located in the containing cavity. The heat insulation piece is arranged between the battery module and the inner wall of the box body; the heat insulation piece is arranged in the groove. According to the battery pack provided by the embodiment of the invention, the groove is formed in the inner wall of the box body, and the heat insulation piece is arranged in the groove, so that the internal space of the battery pack occupied by the heat insulation piece can be effectively reduced, and the space utilization rate of the battery pack is improved.

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] A hybrid electric vehicle is a vehicle that combines two power systems: an engine and an electric motor.

[0003] In related technologies, in hybrid electric vehicles, the engine is typically located at the front of the vehicle, integrated with the transmission and drive system. The battery pack is usually located at the rear of the vehicle, typically under the rear seats or in the trunk area. Engine exhaust can cause heat damage to the battery pack. Currently, the inner walls of the battery pack housing frame need to be lined with heat insulation material.

[0004] However, existing battery packs suffer from insufficient space utilization. Utility Model Content

[0005] This application provides a battery pack and an electrical device that improves the space utilization of the battery pack.

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

[0007] The box has a receiving cavity; the box has a groove formed therein, with the opening of the groove facing the receiving cavity;

[0008] Battery module, the battery module is located in the receiving cavity;

[0009] A heat insulation component is disposed between the battery module and the inner wall of the casing; the heat insulation component is disposed in a groove.

[0010] In some embodiments of this application, the housing includes a side panel having a first side surface; the first side surface is used to form the boundary of the receiving cavity.

[0011] The groove includes a first groove, and the side plate is formed with the first groove.

[0012] Along the height direction of the box, the middle part of the first side of the side plate is recessed towards the side opposite to the receiving cavity, forming a first groove.

[0013] In some embodiments of this application, the housing includes a bottom plate connected to a side plate; the bottom plate has a bottom surface; the bottom surface is used to form the boundary of the receiving cavity.

[0014] The groove includes a second groove, and the bottom plate has a second groove.

[0015] Along the height direction perpendicular to the box body, the bottom surface has a first section, a middle section and a second section connected in sequence; the middle section of the bottom surface is recessed inward relative to the first section and the second section of the bottom surface, facing away from the receiving cavity, to form a second groove.

[0016] In some embodiments of this application, the cross-section of the first groove is square along the height direction of the box; and / or, the cross-section of the second groove is square along the height direction perpendicular to the box.

[0017] In some embodiments of this application, the number of first grooves is multiple; multiple first grooves are spaced apart along the height direction of the box; and / or, multiple first grooves are spaced apart along the height direction perpendicular to the box.

[0018] And / or, the number of second grooves is multiple, and multiple first grooves are spaced apart along the height direction perpendicular to the box body.

[0019] In some embodiments of this application, the battery pack further includes a connector, and the base plate is provided with an opening, through which the connector is connected to the base plate.

[0020] Along the height direction of the housing, the surface of the connector facing away from the bottom plate is higher than the bottom surface; the surfaces of the battery module and the connector facing away from the bottom plate abut against each other.

[0021] In some embodiments of this application, there are multiple connectors, which are arranged in an array along the height direction perpendicular to the housing.

[0022] In some embodiments of this application, the heat insulation component includes a heat insulation board and heat insulation cotton.

[0023] In some embodiments of this application, the housing includes a side plate, a bottom plate, and a top plate. The top plate and the bottom plate are spaced apart along the height direction of the housing, and the side plate connects the top plate and the bottom plate. The side plate, the top plate, and the bottom plate surround each other to form a receiving cavity.

[0024] Among them, at least one of the side plate, bottom plate and top plate is a hollow structure.

[0025] Secondly, embodiments of this application provide an electrical device, including a battery pack.

[0026] This application provides a battery pack and electrical device. The battery pack includes a housing, a battery module, and a heat insulation component. The housing has a receiving cavity; a groove is formed in the housing, with the groove opening facing the receiving cavity. The battery module is located in the receiving cavity. The heat insulation component is disposed between the battery module and the inner wall of the housing; the heat insulation component is disposed in the groove.

[0027] The battery pack provided in this application embodiment can effectively reduce the space occupied by the heat insulation component in the battery pack by forming a groove on the inner wall of the box and placing the heat insulation component in the groove, thereby improving the space utilization rate of the battery pack.

[0028] Because the heat insulation component is placed in a recess, the battery module can utilize more of the internal space of the housing. This means that the housing can accommodate more battery cells, thereby increasing the overall capacity and energy density of the battery pack. Attached Figure Description

[0029] 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.

[0030] Figure 1 A schematic diagram of the battery pack structure provided in the embodiments of this application. Figure 1 ;

[0031] Figure 2 A schematic diagram of the battery pack structure provided in the embodiments of this application. Figure 2 .

[0032] Explanation of reference numerals in the attached figures:

[0033] 100: Box body; 110: Side panel; 111: First groove; 120: Bottom plate; 121: Second groove;

[0034] 200: Battery module;

[0035] 300: Thermal insulation component;

[0036] 400: Connector.

[0037] 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

[0038] 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.

[0039] Hybrid vehicles combine an internal combustion engine and an electric motor as their power systems. Due to space constraints and design requirements, the battery pack is typically located in the vehicle chassis or trunk area, sometimes near the engine or exhaust system. If the battery pack is close to the engine or exhaust system, it may be exposed to the high temperatures generated by the engine and exhaust system.

[0040] Engines produce high-temperature exhaust gases during operation, which are expelled through the exhaust system. The exhaust system can reach extremely high temperatures, especially under heavy engine loads. These hot exhaust gases transfer heat to the surrounding environment, including the battery pack, through conduction, convection, and radiation. If the battery pack is close to a heat source (such as the exhaust system), heat can directly affect the battery pack's temperature through conduction and radiation. Thermal conduction transfers heat through direct material contact, while thermal radiation transfers heat from the heat source to the battery pack via electromagnetic waves.

[0041] Batteries are very sensitive to temperature. Excessively high temperatures can accelerate the chemical reactions of battery materials, thereby reducing battery efficiency and lifespan, and may even lead to safety hazards such as thermal runaway.

[0042] To mitigate the impact of high-temperature exhaust gases on the battery pack, insulating foam is typically installed on the inner wall of the battery pack casing. This insulating foam helps maintain the battery pack's temperature stability by reducing heat conduction and radiation.

[0043] However, since the insulation foam itself occupies space inside the battery pack, the effective space of the battery pack is compressed, reducing the space utilization rate of the battery pack, which also limits the increase in battery capacity.

[0044] Therefore, this application provides a battery pack and an electrical device. The battery pack includes a housing, a battery module, and a heat insulation component. The housing has a receiving cavity; a groove is formed in the housing, with the opening of the groove facing the receiving cavity. The battery module is located in the receiving cavity. The heat insulation component is disposed between the battery module and the inner wall of the housing; the heat insulation component is disposed in the groove.

[0045] The battery pack provided in this application embodiment can effectively reduce the space occupied by the heat insulation component in the battery pack by forming a groove on the inner wall of the box and placing the heat insulation component in the groove, thereby improving the space utilization rate of the battery pack.

[0046] Because the heat insulation component is placed in a recess, the battery module can utilize more of the internal space of the housing. This means that the housing can accommodate more battery cells, thereby increasing the overall capacity and energy density of the battery pack.

[0047] 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.

[0048] Firstly, referring to Figure 1 and Figure 2 As shown, this application embodiment provides a battery pack, including:

[0049] The box 100 has a receiving cavity; the box 100 has a groove formed therein, with the opening of the groove facing the receiving cavity;

[0050] Battery module 200, battery module 200 is located in the receiving cavity;

[0051] A heat insulation component 300 is disposed between the battery module 200 and the inner wall of the housing 100; the heat insulation component 300 is disposed in the groove.

[0052] For example, the housing 100 is the outer shell of the battery pack, and the receiving cavity of the housing 100 is the space inside the housing 100 for placing the battery module 200. The housing 100 is used to provide physical protection and structural support for the battery module 200.

[0053] Battery module 200 is the core component of the battery pack, responsible for storing and supplying electrical energy. It comprises multiple battery cells, and battery module 200 provides the power required by the vehicle.

[0054] The function of the heat insulation component 300 is to reduce heat conduction and heat radiation, and protect the battery module 200 from external heat sources such as ambient temperature and engine exhaust.

[0055] The groove is a recessed portion on the inner wall of the housing 100, with its opening facing the receiving cavity. This design allows the insulation 300 to be embedded into the structure of the housing 100, rather than simply attached to the inner wall.

[0056] By providing grooves on the inner wall of the housing 100, the heat insulation component 300 can be completely embedded in the grooves, thereby reducing the space occupied by the heat insulation component 300 inside the housing cavity. This design allows the battery module 200 to be arranged more compactly, thereby improving space utilization.

[0057] The battery pack provided in this application embodiment can effectively reduce the space occupied by the heat insulation component 300 inside the battery pack by forming a groove in the inner wall of the housing 100 and placing the heat insulation component 300 in the groove, thereby improving the space utilization rate of the battery pack.

[0058] Because the heat insulation component 300 is placed in the recess, the battery module 200 can utilize more of the internal space of the housing 100. This means that the housing 100 can accommodate more battery cells, thereby increasing the overall capacity and energy density of the battery pack. For example, when the battery pack is installed in a vehicle, it helps to improve the vehicle's range and performance.

[0059] In addition, the groove design makes the heat insulation component 300 an integral part of the enclosure 100, enhancing the compactness and integration of the overall structure of the enclosure 100.

[0060] In one possible implementation, the housing 100 includes a side plate 110 having a first side surface; the first side surface is used to form the boundary of the receiving cavity.

[0061] The groove includes a first groove 111, and the side plate 110 is formed with the first groove 111.

[0062] Along the height direction of the housing 100, the middle part of the first side of the side plate 110 is recessed towards the side opposite to the receiving cavity, forming a first groove 111.

[0063] For example, the side panel 110 is part of the housing 100, and its first side is used to define the boundary of the receiving cavity. The side panel 110 provides an enclosed space for the battery module 200 and structurally supports the entire battery pack.

[0064] The central region of the first side of the side plate 110 is concave outward relative to both ends to form a first groove 111, which means that in the middle part of the side plate 110, the material bends outward to form a recessed space.

[0065] By forming a groove on the first side of the side plate 110, the first groove 111 provides a storage space for the insulation 300, which can optimize the use of internal space without increasing the external dimensions of the housing 100. This design reduces the space occupied by the insulation 300 in the housing cavity, thereby improving space utilization.

[0066] By placing the heat insulation element 300 in the first groove 111, heat conduction and radiation between the battery module 200 and external heat sources can be effectively isolated. This helps to maintain the temperature stability of the battery module 200 and improve battery performance and lifespan.

[0067] Because the heat insulation component 300 is placed in the first recess 111, the battery module 200 can be arranged more compactly. This design frees up more effective space in the housing cavity, which can be used to increase battery capacity or optimize the layout of the battery module 200.

[0068] Furthermore, the design of the first groove 111 not only optimizes space but may also enhance the structural strength of the side plate 110. The concave shape can improve the rigidity of the side plate 110, increasing its ability to resist external pressure and impact.

[0069] As one feasible implementation, the cross-section of the first groove 111 is square along the height direction of the housing 100.

[0070] For example, the square cross-section provides maximized internal volume utilization, suitable for compact design requirements. The square cross-section means that the four edges of the first recess 111 are straight, forming a rectangular recessed space. This shape provides a regular and easily manufactured embedding space suitable for accommodating standardized insulation 300.

[0071] In addition, square cross-sections are easier to manufacture and process than other complex shapes, making them suitable for mass production.

[0072] As one feasible implementation, there are multiple first grooves 111; multiple first grooves 111 are arranged at intervals along the height direction of the housing 100.

[0073] For example, the side panel 110 is provided with a plurality of first grooves 111, which are spaced apart along the height direction of the housing 100. The height direction of the housing 100 is referenced to... Figure 1 The direction shown in Y.

[0074] By setting multiple first grooves 111, more heat insulation elements 300 can be distributed on the side plate 110, thereby improving the overall heat insulation effect.

[0075] Multiple first grooves 111 are spaced apart along the height of the housing 100. This arrangement allows the insulation element 300 to provide uniform insulation throughout the entire height range.

[0076] For example, the side panel 110 is provided with a plurality of first grooves 111, which are spaced apart along a direction perpendicular to the height of the housing 100. The height direction of the housing 100 is referenced to... Figure 1 The direction shown in the middle Y. The height direction perpendicular to the box body 100 is perpendicular to the direction shown in the middle Y. Figure 1 The direction of the plane containing XY.

[0077] By setting multiple first grooves 111, more heat insulation elements 300 can be distributed on the side plate 110, thereby improving the overall heat insulation effect.

[0078] Multiple first grooves 111 are arranged at intervals along a height direction perpendicular to the housing 100. This arrangement allows the insulation element 300 to provide uniform insulation across its entire width.

[0079] In some embodiments, there are multiple first grooves 111, some of which are spaced apart along the height direction of the housing 100. Other first grooves 111 are spaced apart along a direction perpendicular to the height of the housing 100.

[0080] In one possible implementation, the housing 100 includes a base plate 120 connected to the side plate 110; the base plate 120 has a bottom surface; the bottom surface is used to form the boundary of the receiving cavity.

[0081] The groove includes a second groove 121, and the base plate 120 has the second groove 121 formed thereon.

[0082] Along the height direction perpendicular to the box 100, the bottom surface has a first section, a middle section and a second section connected in sequence; the middle section of the bottom surface is recessed inward relative to the first section and the second section of the bottom surface toward the side away from the receiving cavity, forming a second groove 121.

[0083] For example, the base plate 120 is part of the housing 100 and is connected to the side plate 110 to form the boundary of the receiving cavity. The base plate 120 and the side plate 110 provide an enclosed space for the battery module 200 and structurally support the entire battery pack.

[0084] The bottom surface of the base plate 120 comprises three parts: a first section, a middle section, and a second section. The middle section is concave outward relative to the first and second sections, forming a second groove 121.

[0085] The second groove 121 on the bottom surface provides a space for the heat insulation element 300 to be embedded. By embedding the heat insulation material into the second groove 121, its occupation of the internal space of the receiving cavity can be reduced, thereby improving the space utilization of the battery pack.

[0086] The heat insulation element 300 in the second groove 121 can effectively isolate the base plate 120 from external heat sources through heat conduction and radiation. This helps to maintain the temperature stability of the battery module 200, thereby improving battery performance and lifespan.

[0087] Because the heat insulation component 300 is placed in the second recess 121 of the base plate 120, the battery module 200 can be arranged more compactly. This design frees up more usable space, which can be used to increase battery capacity or optimize the layout of the battery module 200.

[0088] In this way, by setting heat insulation components 300 around the battery module 200, that is, setting heat insulation components 300 on the base plate 120 and side plates 110, the battery pack can achieve all-round heat insulation protection. This design can effectively isolate the battery module 200 from heat conduction and radiation between it and the external environment. The all-round heat insulation design helps to maintain the temperature stability of the battery module 200 under various environmental conditions, reducing performance degradation and shortened lifespan caused by temperature fluctuations.

[0089] By providing a first groove 111 on the side plate 110 and a second groove 121 on the bottom plate 120, the heat insulation component 300 can be partially or completely placed in the grooves. This design reduces the space occupied by the heat insulation component 300 within the receiving cavity. The freed-up space can be used to increase battery capacity or optimize the layout of the battery module 200, allowing the battery pack to accommodate more battery cells within the same volume.

[0090] As one feasible implementation, the cross-section of the second groove 121 is square along the height direction perpendicular to the housing 100.

[0091] For example, the square cross-section provides maximized internal volume utilization, suitable for compact design requirements. The square cross-section means that the four edges of the second recess 121 are straight, forming a rectangular recessed space. This shape provides a regular and easily manufactured embedding space suitable for accommodating standardized insulation 300.

[0092] Square cross-sections are easier to manufacture and process than other complex shapes, making them suitable for mass production.

[0093] As one possible implementation, there are multiple second grooves 121, and multiple first grooves 111 are spaced apart along the height direction perpendicular to the housing 100.

[0094] In some embodiments, refer to Figure 1 In the direction shown by X, multiple second grooves 121 are along Figure 1 The spacing is set in the direction indicated by X.

[0095] In other embodiments, a plurality of second grooves 121 are along Figure 1 The intervals are set perpendicular to the plane containing X and Y.

[0096] The spaced-out second grooves 121 can enhance the structural strength of the base plate 120, providing better support and stability.

[0097] By setting multiple second grooves 121, more heat insulation elements 300 can be distributed on the base plate 120, thereby improving the overall heat insulation effect.

[0098] As one possible implementation, the battery pack also includes a connector 400, and the base plate 120 is provided with an opening, through which the connector 400 is connected to the base plate 120.

[0099] Along the height direction of the housing 100, the surface of the connector 400 facing away from the bottom plate 120 is higher than the bottom surface; the surfaces of the battery module 200 and the connector 400 facing away from the bottom plate 120 abut against each other.

[0100] For example, the base plate 120 is provided with an opening through which the connector 400 is connected to the base plate 120. This design allows the connector 400 to be securely fixed to the base plate 120.

[0101] The connector 400 extends along the height of the housing 100, with its surface facing away from the base plate 120 higher than the bottom surface. This means that the connector 400 extends above the horizontal plane of the base plate 120, providing support for the battery module 200. The battery module 200 abuts against the surface of the connector 400 facing away from the base plate 120. This design ensures that the battery module 200 is securely fixed to the connector 400 during installation.

[0102] Since the housing 100 is made of metal, and the base plate 120 is also made of metal, this means that the base plate 120 has good thermal conductivity. The metal base plate 120 easily conducts heat from external sources such as engine exhaust. For example, engine exhaust heat can be directly transferred to the battery module 200 through the base plate 120, affecting the performance of the battery module 200.

[0103] Therefore, in this embodiment, by providing a connector 400 on the base plate 120, the battery module 200 does not directly contact the base plate 120, but rather contacts it through the connector 400. This design reduces the direct contact area between the battery module 200 and the base plate 120. The contact between the battery module 200 and the connector 400 is a surface-to-point contact, which further reduces the path of heat transfer from the base plate 120 to the battery module 200. By reducing the direct contact area, the heat conducted from the base plate 120 to the battery module 200 is reduced, thereby helping to maintain the temperature stability of the battery module 200.

[0104] In some embodiments, the connector 400 is a front rivet nut, also known as a blind rivet nut or rivet cap, which is a fastener used to create threads on thin plates or pipes.

[0105] As one feasible implementation, there are multiple connectors 400, which are arranged in an array along the height direction perpendicular to the housing 100.

[0106] For example, multiple connectors 400 are arranged in an array along a height direction perpendicular to the housing 100. This arrangement forms a regular support structure on the base plate 120. The uniform distribution of the connectors 400 helps to provide stable support and reduce local stress concentration in the battery module 200.

[0107] By using a point contact design with multiple connectors 400, the direct contact area between the battery module 200 and the base plate 120 is further reduced, thereby reducing heat conduction.

[0108] Multiple connectors 400 provide a wider support area, enhancing the stability of the battery module 200, especially during the operation of electrical equipment, effectively reducing the impact of vibration and shock on the battery module 200.

[0109] The array-shaped connector 400 design helps to evenly distribute the weight of the battery module 200, improving the strength and stability of the overall structure.

[0110] As one feasible implementation, the thermal insulation component 300 includes a thermal insulation board and thermal insulation cotton.

[0111] For example, the insulation panel includes any one of ceramic fiberboard, glass fiberboard, and polyurethane board. The insulation panel has rigidity and strength; due to its rigidity, it can provide additional structural support, enhancing the overall stability of the battery pack.

[0112] Thermal insulation materials include any of the following: fiberglass, mineral wool, and ceramic fiber. They can easily fill complex geometries and confined spaces, providing comprehensive insulation coverage. Due to their flexibility and lightweight properties, thermal insulation is easy to install and adjust.

[0113] As one feasible implementation, the housing 100 includes a side plate 110, a bottom plate 120 and a top plate. The top plate and the bottom plate 120 are spaced apart along the height direction of the housing 100, and the side plate 110 connects the top plate and the bottom plate 120. The side plate 110, the top plate and the bottom plate 120 surround each other to form a receiving cavity.

[0114] Among them, at least one of the side plate 110, bottom plate 120 and top plate is a hollow structure.

[0115] For example, the housing 100 includes a side plate 110, a bottom plate 120, and a top plate, which surround to form a receiving cavity for housing the battery module 200. The top plate and the bottom plate 120 are spaced apart along the height direction of the housing 100, and the side plate 110 connects the top plate and the bottom plate 120 to form a complete housing 100 structure.

[0116] At least one of the side plate 110, bottom plate 120, and top plate is designed as a hollow structure. The hollow structure can be achieved by extrusion molding, welding, or other manufacturing processes.

[0117] The hollow structure reduces the amount of material used, thus lowering the overall weight. The hollow sections also act as heat dissipation channels, enhancing airflow and aiding in heat dissipation.

[0118] The hollow structure can isolate heat conduction to a certain extent and reduce the impact of external heat sources on the battery module 200.

[0119] For example, the housing 100 is made of aluminum alloy. The housing 100 has a cavity extruded aluminum profile structure. The groove depth is A, where A satisfies: 8mm ≤ A ≤ 12mm. Within this range, the housing 100 has sufficient strength, while the heat insulation component 300 can be placed in the groove. The housing 100's cavity can accommodate more battery modules 200, increasing space utilization.

[0120] In some embodiments, the depth of the groove is 10 mm.

[0121] Secondly, embodiments of this application provide an electrical device, including a battery pack.

[0122] For example, the electrical equipment may be a vehicle. This application does not limit the specific type of electrical equipment.

[0123] It is understood that since the electrical equipment of this application adopts the technical solution of the above-described battery pack embodiment, it has at least the beneficial effects brought about by the technical solution of the above-described battery pack embodiment, which will not be elaborated here.

[0124] 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.

[0125] 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 housing (100) having a receiving cavity; the housing (100) having a groove formed therein, the opening of the groove facing the receiving cavity; A battery module (200) is located in the receiving cavity; A heat insulation component (300) is disposed between the battery module (200) and the inner wall of the housing (100); the heat insulation component (300) is disposed in the groove.

2. The battery pack according to claim 1, characterized in that, The housing (100) includes a side panel (110) having a first side surface; the first side surface is used to form the boundary of the receiving cavity; The groove includes a first groove (111), and the side plate (110) is formed with the first groove (111); Along the height direction of the housing (100), the middle part of the first side of the side plate (110) is recessed towards the side opposite to the receiving cavity, forming the first groove (111).

3. The battery pack according to claim 2, characterized in that, The housing (100) includes a base plate (120) connected to the side plate (110); the base plate (120) has a bottom surface; the bottom surface is used to form the boundary of the receiving cavity; The groove includes a second groove (121), and the bottom plate (120) is formed with the second groove (121); Along the height direction perpendicular to the housing (100), the bottom surface has a first section, a middle section and a second section connected in sequence; the middle section of the bottom surface is recessed inward relative to the first section and the second section of the bottom surface toward the side away from the receiving cavity, forming the second groove (121).

4. The battery pack according to claim 3, characterized in that, Along the height direction of the box body (100), the cross-section of the first groove (111) is square; and / or, along the height direction perpendicular to the box body (100), the cross-section of the second groove (121) is square.

5. The battery pack according to claim 3, characterized in that, The number of the first grooves (111) is multiple; the multiple first grooves (111) are spaced apart along the height direction of the box body (100); and / or, the multiple first grooves (111) are spaced apart along the height direction perpendicular to the height direction of the box body (100); And / or, the number of the second grooves (121) is multiple, and multiple first grooves (111) are spaced apart along the height direction perpendicular to the box body (100).

6. The battery pack according to any one of claims 3-5, characterized in that, It also includes a connector (400), the base plate (120) is provided with an opening, and the connector (400) is connected to the base plate (120) through the opening; Along the height direction of the housing (100), the surface of the connector (400) facing away from the base plate (120) is higher than the bottom surface; the battery module (200) and the surface of the connector (400) facing away from the base plate (120) abut against each other.

7. The battery pack according to claim 6, characterized in that, There are multiple connectors (400), and the multiple connectors (400) are arranged in an array along the height direction perpendicular to the box body (100).

8. The battery pack according to any one of claims 3-5, characterized in that, The heat insulation component (300) includes at least one of heat insulation board and heat insulation cotton.

9. The battery pack according to any one of claims 1-5, characterized in that, The housing (100) includes a side plate (110), a bottom plate (120), and a top plate. Along the height direction of the housing (100), the top plate and the bottom plate (120) are spaced apart, and the side plate (110) connects the top plate and the bottom plate (120). The side plate (110), the top plate, and the bottom plate (120) surround to form the receiving cavity. Among them, at least one of the side plate (110), the bottom plate (120) and the top plate is a hollow structure.

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

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