Battery devices and electrical equipment

Abstract

This application provides a battery device and an electrical appliance, belonging to the field of batteries. The second housing of the battery device includes a housing body and a heat insulation structure; the housing body and the first housing of the battery device overlap and merge along a first direction to jointly enclose a receiving cavity; a groove is formed on the outer surface of the housing body for accommodating a heat source; the heat insulation structure is located outside the receiving cavity and disposed within the groove, and the heat insulation structure separates the housing body from the heat source. The heat insulation structure includes a first functional layer and a second functional layer disposed sequentially away from the first housing body along the first direction. One of the first functional layer and the second functional layer is used to reflect heat from the heat source, and the other is used to suppress the transfer of heat from the heat source to the housing body. This solution improves the heat damage protection capability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Currently, new energy electric vehicles are broadly classified into plug-in hybrid electric vehicles (PHEVs) and battery electric vehicles (BEVs). PHEVs inevitably have an exhaust system. When a hybrid electric vehicle uses fuel to charge the battery or uses fuel as its power source, the exhaust system operates at temperatures as high as 500°C. This can cause extremely high temperatures to damage the battery, leading to a decline in battery performance. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide a battery device and electrical equipment that improves the thermal damage protection capability of the battery device, thereby mitigating the problem of performance degradation caused by thermal damage in the related art.

[0005] An embodiment of the first aspect of this application provides a battery device, including: a first housing and a second housing, the second housing including a housing body and a heat insulation structure; the housing body and the first housing cover each other along a first direction and jointly enclose a receiving cavity; a groove is formed on the outer surface of the housing body for accommodating a heat source; the heat insulation structure is located outside the receiving cavity and disposed in the groove, the heat insulation structure is used to separate the housing body and the heat source, the heat insulation structure includes a first functional layer and a second functional layer disposed sequentially away from the first housing body along the first direction, one of the first functional layer and the second functional layer is used to reflect the heat from the heat source and the other is used to suppress the heat from the heat source from being transferred to the housing body.

[0006] In the technical solution of this application embodiment, a groove for accommodating a heat source is defined on the outer surface of the second housing body, and a heat insulation structure is arranged in the groove to separate the housing body and the heat source. This embodiment provides a heat insulation structure in the area of ​​the battery device envelope near the heat source, improving the battery device's thermal protection capability and mitigating the problem of performance degradation caused by thermal damage in related technologies.

[0007] In some embodiments, the box body includes a first wall and a second wall arranged sequentially away from the first box body along a first direction, and a connecting wall connecting the first wall and the second wall; the first wall is connected to the second wall on at least one side along a second direction, and the first wall and the connecting wall together define a groove; a heat insulation structure is at least covered on the first wall; wherein the second direction intersects the first direction.

[0008] Compared with technical solutions where the cross-sectional shape of the groove is "U" or "V", this embodiment sets the box body to include a first wall and a connecting wall, which define the groove. The first wall is a planar structure, and the heat insulation structure is also a planar structure when it is only covered on the first wall, resulting in a simple structure.

[0009] In some embodiments, the battery device further includes: a plurality of battery cells, the plurality of battery cells being housed in a receiving cavity and arranged to form at least two battery packs stacked along a first direction, a portion of the at least two battery packs being formed as a first battery pack and the remainder being formed as a second battery pack; each first battery pack being arranged on the side of the first wall away from the second wall; at least a portion of each second battery pack being housed in the housing body, and the second battery pack being arranged on at least one side of the groove in the second direction.

[0010] Based on the groove formed on the outer surface of the main body of the box, this embodiment also arranges the battery cells inside the box into multiple layers, and the second battery pack housed in the main body of the box is located on at least one side of the groove in the second direction. This allows the arrangement of the battery cells to be adapted to the shape and structure of the main body of the box, which is beneficial to improving the utilization rate of the internal space of the box and optimizing the battery energy density.

[0011] In some embodiments, the first wall is connected to a second wall on each side along the second direction, and the second battery pack includes a first battery module and a second battery module. The first battery module and the second battery module correspond to the two second walls respectively and are located on the side of the corresponding second wall facing the first housing. Along the second direction, the first battery module and the second battery module are located on both sides of the groove respectively.

[0012] In this embodiment, the first wall and the two connecting walls together define the groove. Based on this, the second battery pack is designed to consist of two battery modules, which are respectively arranged on both sides of the groove along the second direction. This allows the arrangement of the battery cells to be adapted to the shape and structure of the main body of the box, which is conducive to improving the utilization rate of the internal space of the box and optimizing the battery energy density.

[0013] In some embodiments, a first gap exists between the first battery pack closest to the second battery pack and the first wall in a first direction. This embodiment prevents the first battery pack closest to the second battery pack from directly contacting the first wall, increasing the distance between the first battery pack and the heat source in the first direction, which helps to reduce the heat transferred from the heat source to the first battery pack.

[0014] In some embodiments, the end of the connecting wall that is connected to the first wall is the first end, and the end of the connecting wall that is connected to the second wall is the second end; in the second direction, the first end is closer to the first wall than the second end; with a plane perpendicular to the first direction as the projection plane and the first direction as the projection direction, the projection of the second battery pack does not coincide with the projection of the first wall and the connecting wall.

[0015] This embodiment creates a second gap between the second battery pack and the first end of the first wall in the second direction, which helps to increase the distance between the first battery pack and the heat source in the second direction, thereby reducing the amount of heat transferred from the heat source to the second battery pack.

[0016] In some embodiments, the connecting wall includes a first connecting wall, a second connecting wall, and a third connecting wall, wherein the first wall, the first connecting wall, the second connecting wall, the third connecting wall, and the second wall are connected in turn in sequence.

[0017] In some embodiments, the thermal insulation structure is applied to the first wall; or, the thermal insulation structure is applied to the first wall and at least a portion of the connecting wall; or, the thermal insulation structure is applied to the first wall, the connecting wall, and at least a portion of the second wall.

[0018] In some embodiments, the first functional layer and the second functional layer are adapted to conform to the shape of the groove. This technical solution allows for efficient use of space and reduces wasted space in the arrangement of the thermal insulation structure.

[0019] In some embodiments, the second housing further includes a first flange disposed around the outer periphery of the housing body and connected to the housing body; the groove extends through the housing body along a third direction, and the two ends of the second functional layer along the third direction are respectively fastened to the first flange and the first housing body by locking members; wherein, the third direction intersects with the first direction.

[0020] Using this technical solution, the locking component connecting the first housing and the second housing can be used to simultaneously lock the first housing and the thermal insulation structure. This not only saves on the number of locking components but also reduces assembly steps, thereby improving assembly efficiency.

[0021] In some embodiments, the battery device further includes fasteners, at least a portion of which are first fasteners, and the thermal insulation structure is fastened to the housing body via the first fasteners.

[0022] In this embodiment, the heat insulation structure is fastened to the main body of the casing by the first fastener, instead of using a locking device that connects the first and second casings to lock the heat insulation structure and the main body. This avoids the fasteners connecting the heat insulation structure and the main body from coming loose and twisting, which would affect the sealing performance of the battery device.

[0023] In some embodiments, the housing body includes a first wall that forms a recess and is close to a heat source. The surface of the first wall facing away from the first housing body faces the heat source. Fasteners extend from the side of the first wall facing away from the first housing body along a first direction into the receiving cavity. A heat insulation structure is fastened to the first wall by the first fasteners.

[0024] In this embodiment, the structure in the groove wall that is mainly close to the heat source (i.e., the first wall) is connected to the heat insulation structure through the first fastener. As the structure that is mainly close to the heat source, the first wall has a relatively large area, which facilitates the arrangement of the fasteners.

[0025] In some embodiments, the first fasteners are provided with a plurality of fasteners arranged side by side to form at least one first array structure, wherein the plurality of first fasteners included in the first array structure are arranged at intervals along the circumference of the first wall.

[0026] This technical solution increases the number of first fasteners, which helps to improve the connection reliability between the thermal insulation structure and the main body of the box.

[0027] In some embodiments, the second housing further includes a metal liner and a rivet nut disposed in the receiving cavity. The metal liner has a first mounting hole that extends through the metal liner in a first direction. The rivet nut is fitted into the first mounting hole and is connected to a fastener.

[0028] Using this technical solution, there is no need to pre-drill internal threads on the first wall. The rivet nut can provide sufficient thread length to provide a reliable internal thread connection between the thermal insulation structure and the first wall.

[0029] In some embodiments, the second housing further includes an elastic sealing gasket disposed between the first wall and the metal liner, the elastic sealing gasket having a second mounting hole through which fasteners pass.

[0030] By adopting this technical solution, the elastic sealing gasket can seal the gap between the first wall and the metal liner, preventing the cavity from communicating with the external environment of the box through the gap, thus giving the battery device good airtightness.

[0031] In some embodiments, the second housing further includes a bushing, the first wall is provided with a third mounting hole communicating with the second mounting hole, the bushing is installed in the second mounting hole and the third mounting hole, one end of the bushing facing the first housing abuts against a rivet nut, and a fastener passes through the bushing.

[0032] This embodiment introduces a bushing in the connection path of the fastener, which prevents the elastic sealing gasket from participating in the transmission of preload, thereby reducing the preload attenuation caused by compression and creep of the elastic sealing gasket and improving the connection reliability of the fastener.

[0033] In some embodiments, at least some of the fasteners are second fasteners arranged to form at least one second array structure, the second array structure including a plurality of second fasteners arranged sequentially at intervals along the circumference of the first wall; the head of each second fastener is located on the side of the second functional layer facing the first housing; and all the first fasteners are located inside the second array structure.

[0034] Using this technical solution, the second array structure forms a barrier around the first fastener to block moisture and dust entering through the through-holes of the first fastener in a direction perpendicular to the first direction. At the same time, since the second fastener does not pass through the second functional layer, it will not introduce new airtightness issues, which helps to further improve the airtightness of the battery device.

[0035] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0036] In some embodiments, the electrical equipment is a hybrid power equipment, which includes an exhaust system that is a heat source.

[0037] By adopting this technical solution, the hybrid electric equipment uses the battery device in the above embodiment to form a power system, which can improve the problem of the battery device of the hybrid electric equipment being affected by the heat damage of the exhaust system, resulting in a decrease in performance.

[0038] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0039] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0040] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 This is an exploded view of the battery device according to some embodiments of this application; Figure 3 for Figure 2 A schematic diagram of the second housing and exhaust pipe shown; Figure 4 for Figure 2 An exploded view of the second box shown; Figure 5 for Figure 2 The diagram shows a top view of the second housing. Figure 6 for Figure 2 The diagram shows the front view of the second housing. Figure 7 for Figure 6 A magnified view of a portion of point I in the middle; Figure 8 This is a schematic diagram of the second housing and exhaust pipe according to other embodiments of this application; Figure 9 for Figure 8 The diagram shows the structure of the second box. Figure 10 for Figure 8 The diagram shows a top view of the second housing. Figure 11 for Figure 8 The diagram shows the front view of the second housing. Figure 12 This is a cross-sectional schematic diagram of the battery device in some other embodiments of this application, omitting the heat insulation structure; Figure 13 This is a cross-sectional schematic diagram of a battery device in some modified embodiments of this application, omitting the heat insulation structure; Figure 14 This is a cross-sectional schematic diagram of a battery device in some embodiments of this application, omitting the heat insulation structure; Figure 15 For along Figure 11 A cross-sectional view along the AA direction; Figure 16 for Figure 15 A magnified view of a portion of the image; Figure 17 For along Figure 11 Cross-sectional view along the BB direction; Figure 18 for Figure 17 A magnified view of a portion of the image.

[0041] Explanation of reference numerals in the attached figures: 1000 vehicles; Battery unit 100, controller 200, motor 300, exhaust pipe 400; Box 110, first box 110a, second box 110b, first gap 111, second gap 112, bottom wall 113, battery cell assembly 120, battery cell 121, first battery pack 122, second battery pack 123, first battery module 1231, second battery module 1232. Box body 10, enclosure wall 11, first wall 12, second wall 13, connecting wall 14, first connecting wall 141, second connecting wall 142, third connecting wall 143, first step 151, second step 152, first flange 16, first connecting hole 161, groove 17. The heat insulation structure 20 includes a first functional layer 21, a second through hole 211, a heat insulation main body 212, a first sub-heat insulation part 213, a second sub-heat insulation part 214, a third sub-heat insulation part 215, a second functional layer 22, a connecting edge 221, a second connecting hole 2211, a protrusion 222, a heat radiation main body 223, a first heat radiation part 224, a second heat radiation part 225, and a third heat radiation part 226. Fastener 30, first fastener 30a, second fastener 30b, head 301, rivet nut 31, rod 311, second flange 312; Metal lining plate 40; 50 elastic sealing gasket; Bushing 60, cylinder 61, third flange 62; Locking component 70. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components.

[0050] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0051] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0052] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0053] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0054] Plug-in hybrid electric vehicles (PHEVs) have an exhaust system, which includes an exhaust pipe. When a PHEV uses fuel to charge the battery or for power, the temperature of the exhaust pipe far exceeds the optimal operating temperature of the battery pack. Furthermore, the exhaust pipe extends directly from the front to the rear of the vehicle, intersecting with the battery pack. Therefore, the exhaust pipe can cause extremely high temperatures to the battery, leading to a decline in battery performance.

[0055] Some related technologies propose using composite materials to make the battery pack casing. The composite material includes a fire-resistant silicone layer, a crosslinking layer, and a thermosetting prepreg compression molding (PCM) layer, arranged sequentially away from the casing's cavity. The fire-resistant silicone layer contains a crosslinking agent, and the PCM layer is made from epoxy resin PCM prepreg, epoxy vinyl PCM prepreg, etc. The crosslinking layer is coated with a coating agent. The preparation process of the composite material is roughly as follows: the PCM layer is prepared; the fire-resistant silicone layer is prepared; a coating agent is applied to the surface of the crosslinking layer; the fire-resistant silicone layer, crosslinking layer, and PCM layer are stacked sequentially from top to bottom, and the composite material is obtained through a hot-pressing process. During the hot-pressing process, the epoxy groups in the PCM layer undergo a crosslinking reaction with the hydroxyl groups in the crosslinking layer at high temperature, and the vinyl groups in the fire-resistant silicone layer and the coating agent undergo a crosslinking reaction to form a stable structure. The resulting composite material is a one-piece structure. In this method, the casing can achieve both fire resistance and thermal insulation performance.

[0056] However, since the entire enclosure in the related technology is made of the aforementioned composite material, the material cost is high. Moreover, the layers of the enclosure are fixed by a cross-linked structure formed by a chemical reaction. During the production process, various cross-linking agents, catalysts, and other chemical reagents need to be added for the reaction. The chemical reaction is highly sensitive to the environment, and fluctuations in the environment can easily cause different degrees of cross-linking, resulting in poor stability of the cross-linked structure. Therefore, the production consistency of the enclosure is low, and its heat protection performance is unstable.

[0057] To address at least one of the aforementioned problems, this application innovatively improves the housing of the battery device by providing a heat insulation structure on the outside of the main body of the second housing, and by providing the heat insulation structure to cover at least a portion of the groove wall of the groove on the main body for accommodating a heat source, wherein the heat insulation structure can separate the main body of the housing from the heat source.

[0058] In this battery device, the thermal insulation structure enhances its thermal protection capabilities, mitigating the performance degradation of individual battery cells due to heat from heat sources. Furthermore, compared to related technologies where the entire casing is constructed from fire-retardant silicone, crosslinking, and PCM layers, the thermal insulation structure in this embodiment can be flexibly adjusted based on the location of the heat source. This allows for precise thermal insulation of localized areas within the battery device's envelope affected by heat, saving materials, reducing raw material costs, and minimizing space waste.

[0059] The battery device provided in this application can be used, but is not limited to, in electrical equipment or energy storage devices such as automobiles, ships, or aircraft. A power system incorporating the battery device provided in this application can be used to construct such electrical equipment or energy storage device.

[0060] The energy storage device utilizing a battery as a power system in this application embodiment can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output it at appropriate times. For example, the energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage device provided in this application embodiment can be used in any power system that requires energy storage.

[0061] In some embodiments, the energy storage device is an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0062] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet. Each battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, these clusters are connected in parallel to increase the capacity of the energy storage device.

[0063] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0064] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0065] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0066] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] Figure 2 An exploded view of a battery device 100 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 100 provided in the embodiments of this application may include one or more battery cell assemblies 120 for providing voltage and capacity. The battery cell assembly 120 may include multiple battery cells 121, which are connected in series, parallel, or mixed connection via a busbar.

[0068] In some embodiments, the battery cell assembly 120 is typically formed by arranging a plurality of battery cells 121.

[0069] As an example, the battery cell assembly 120 can be a battery module, which is formed by arranging and fixing multiple battery cells 121 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 121 together with cable ties.

[0070] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 110 and one or more battery cell assemblies 120, with the battery cell assemblies 120 housed within the housing 110. The housing 110 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the housing 110 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0071] As an example, the battery cell assembly 120 can be a battery module, which can be housed in the housing 110 by fixing the battery module in the housing 110.

[0072] As an example, the battery cell assembly 120 can also be housed in the housing 110 by directly fixing multiple battery cells 121 to the housing 110.

[0073] As an example, the housing 110 may include a first housing 110a and a second housing 110b. The first housing 110a and the second housing 110b are fastened together to form a receiving cavity inside the housing 110 to house the battery cell assembly 120. Here, "closed" refers to covering or shutting off; it can be either non-sealed or sealed to prevent liquids or other foreign matter from affecting the charging or discharging of the battery cell 121. The first housing 110a may be a top cover or a bottom plate.

[0074] As an example, the housing 110 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 110 forms a receiving cavity to accommodate the battery cell assembly 120.

[0075] In some embodiments, the housing 110 may be part of the chassis structure of the vehicle. For example, a portion of the housing 110 may be at least a portion of the floor of the vehicle, or a portion of the housing 110 may be at least a portion of the crossbeams and longitudinal beams of the vehicle.

[0076] The battery cell 121 involved in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell 121 that can be used again after being discharged by recharging to activate the active materials.

[0077] The battery cell 121 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. As an example, the battery cell 121 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc., and this application has no particular limitations.

[0078] Figure 3 for Figure 2 The diagram shown depicts the second housing and the exhaust pipe. Figure 4 for Figure 2 The exploded view of the second box shown is as follows. Figure 5 for Figure 2 The diagram shown is a top view of the second housing. Figure 6 for Figure 2 The diagram shows the front view of the second housing. Figure 7 for Figure 6 A magnified view of a portion of point I in the middle. Figure 8 This is a schematic diagram of the second housing and exhaust pipe according to other embodiments of this application. Figure 9 for Figure 8 The diagram shown is a structural schematic of the second box. Figure 10 for Figure 8 The diagram shown is a top view of the second housing. Figure 11 for Figure 8 The diagram shows the front view of the second housing.

[0079] Please see Figures 3 to 11 In the battery device provided in this application embodiment, the second housing 110b includes a housing body 10 and a heat insulation structure 20; the housing body 10 and the first housing body 110a overlap each other along a first direction to jointly enclose a receiving cavity. A groove 17 is formed on the outer surface of the housing body 10, and the groove 17 is used to accommodate a heat source. The heat insulation structure 20 is located outside the receiving cavity and disposed in the groove 17. The heat insulation structure 20 is used to separate the housing body 10 and the heat source. The heat insulation structure 20 includes a first functional layer 21 and a second functional layer 22 disposed sequentially away from the first housing body 110a along the first direction. One of the first functional layer 21 and the second functional layer 22 is used to reflect the heat from the heat source, and the other is used to suppress the heat from the heat source from being transferred to the housing body 10.

[0080] As an example, the box is rectangular in shape, and the first direction can be referred to as the height direction of the box. In the accompanying drawings of the embodiments of this application, the first direction can be referred to as the Z direction.

[0081] In some embodiments, such as Figure 2 As shown, the main body 10 of both the first box 110a and the second box 110b can be a hollow structure with one side open. The open side of the first box 110a and the open side of the main body 10 cooperate with each other so that the first box 110a and the main body 10 together define the receiving cavity. Figure 2 In this configuration, the first housing 110a can be a lower housing, and the main body 10 of the second housing 110b can be an upper cover. In some embodiments, one of the main bodies 10 of the first housing 110a and the second housing 110b can be a hollow structure open on one side, and the other can be a plate-like structure. As an example, the first housing 110a can be a plate-like structure, and the main body 10 of the second housing 110b can be a hollow structure open on one side, with the first housing 110a located on the open side of the main body 10.

[0082] The groove 17 is a recessed portion formed in the main body 10 of the housing. In some embodiments, the groove 17 may be formed on the wall of the main body 10 facing the first housing 110a, with one end of the groove 17 open away from the first housing 110a. In some embodiments, the groove 17 may also be formed on the surrounding wall 11 of the main body 10 surrounding the battery cell assembly. As an example, the main body 10 may be cuboid in shape, and the surrounding wall 11 may be formed by four side walls connected end to end in sequence, and the groove 17 may be designed to have one end open away from any one of the four side walls.

[0083] This embodiment does not specifically limit the shape of the groove 17, so as to... Figure 6 The view shown is in the cross-sectional direction. The cross-sectional shape of the groove 17 along this direction can be U-shaped, V-shaped, |-shaped, arc-shaped, etc. The groove 17 is designed to prevent interference between the battery device and the heat source, thus avoiding interference with the heat source. There can be one or more grooves 17. Each groove 17 can accommodate one heat source or multiple heat sources simultaneously. A heat source refers to a component that generates heat, such as electronic devices, the air conditioning and heating systems of electric vehicles, and the exhaust pipe 400 of a plug-in hybrid electric vehicle.

[0084] The thermal insulation structure 20 is a component capable of inhibiting the transfer of heat between the heat source and the housing body 10 through at least one of thermal conduction, thermal convection, and thermal radiation. The thermal insulation structure 20 includes a first functional layer 21 and a second functional layer 22. Figure 4 In the middle, the first functional layer 21 and the second functional layer 22 are arranged from bottom to top, that is, the first functional layer 21 is located below the second functional layer 22.

[0085] One of the first functional layer 21 and the second functional layer 22 is a heat radiation layer for reflecting heat from the heat source, and the other is a heat insulation layer for suppressing the transfer of heat from the heat source to the main body 10 of the box. In some embodiments, the first functional layer 21 is a heat radiation layer and the second functional layer 22 is a heat insulation layer. In some embodiments, the first functional layer 21 is a heat insulation layer and the second functional layer 22 is a heat radiation layer. Compared with the embodiment where the first functional layer 21 is a heat radiation layer and the second functional layer 22 is a heat insulation layer, in this example, the heat radiation layer is not covered by the heat insulation layer, resulting in a better heat reflection effect.

[0086] The heat-radiating layer is used to reflect heat radiation away from the receiving cavity, thereby reducing the heat transferred from the heat source to the housing via heat radiation. The heat-radiating layer is made of a material that reflects heat radiation. For example, the heat-radiating layer can be a metal layer made of a metallic material, which has heat radiation properties. For instance, the heat-radiating layer can be an aluminum layer. For example, the heat-radiating layer can be a ceramic layer made of a ceramic material. In some embodiments, the surface of the heat-radiating layer facing away from the first housing 110a can be polished using a polishing process, which helps to improve the heat reflection capability of the heat-radiating layer.

[0087] "The insulation layer inhibits the transfer of heat from the heat source to the main body 10" means that the transfer of heat to the main body 10 is restricted by the insulation layer, increasing the difficulty of heat transfer and reducing the amount of heat conducted to the main body 10. The insulation layer has high thermal resistance and can be made of insulation materials, such as aerogel, insulation felt, ceramic fiber, and glass fiber. The rigidity of the insulation layer is usually lower than that of the heat radiation layer.

[0088] The phrase "heat insulation structure 20 is disposed in groove 17" is intended to describe that the heat insulation structure 20 covers at least a portion of the groove wall of groove 17, provided that the heat insulation structure 20 can separate the main body 10 of the box from the heat source. Specifically, the heat insulation structure 20 can bear and support the heat source, meaning that the heat source is at least in contact with the portion of the heat insulation structure 20 covering the groove 17, or there can be a predetermined distance between the heat source and the heat insulation structure 20.

[0089] In this embodiment, the outer surface of the main body 10 of the second housing 110b defines a groove 17 for accommodating a heat source, and a heat insulation structure 20 is arranged in the groove 17 to separate the main body 10 from the heat source. This embodiment provides a heat insulation structure 20 in the area of ​​the battery device envelope near the heat source, improving the battery device's thermal protection capability and weakening or even eliminating the performance degradation of individual battery cells due to heat from the heat source. In this document, "thermal protection" refers to the heat insulation means and measures taken to reduce the excessively high temperature of individual battery cells caused by heat damage from the heat source.

[0090] In this embodiment, the heat insulation structure 20 includes a first functional layer 21 and a second functional layer 22. One of the first functional layer 21 and the second functional layer 22 can reflect heat, and the other can reduce the heat exchange between the heat source and the box body 10. This forms a dual suppression of heat radiation and heat conduction, resulting in better heat damage protection.

[0091] Moreover, compared with the technical solutions in related technologies where the entire housing is made of fire-resistant silicone layer, crosslinking layer and PCM layer, the position of the heat insulation structure 20 in this embodiment can be flexibly adjusted according to the position of the heat source, so as to achieve precise heat insulation of the local area affected by the heat source in the envelope of the battery device. The heat insulation structure 20 does not need to be laid on the entire envelope surface, which can save materials, reduce raw material costs and space waste.

[0092] As can be seen from the preceding text, the structure of the box body 10 is diverse, so that the outer surface of the box body 10 can define grooves 17 of various shapes.

[0093] According to some embodiments of this application, such as Figure 4 , Figure 7 , Figure 9 and Figure 10 The housing body 10 can be configured to include a first wall 12 and a second wall 13 arranged sequentially away from the first housing body 110a along a first direction, and a connecting wall 14 connecting the first wall 12 and the second wall 13. The first wall 12 is connected to the second wall 13 on at least one side along a second direction, and the first wall 12 and the connecting wall 14 together define a groove 17. The heat insulation structure 20 is at least covered on the first wall 12. The second direction intersects the first direction.

[0094] In some embodiments, the second direction may be perpendicular to the first direction, or the second direction may be at an angle to the first direction. For example, the box is rectangular in shape, and the second direction is perpendicular to the first direction; in this case, the second direction can be referred to as the length direction or width direction of the box. In the accompanying drawings of the embodiments of this application, the second direction can be referred to as the X direction.

[0095] The first wall 12 is located on the side of the second wall 13 facing the first housing 110a, that is, along the first direction, the first wall 12 is located between the second wall 13 and the first housing 110a. Figure 4 In the middle, the first wall 12 is located below the second wall 13. The second wall 13 is connected to the side of the first wall 12 along the second direction via a connecting wall 14.

[0096] Figure 12 This is a cross-sectional schematic diagram of the battery device in some other embodiments of this application, omitting the heat insulation structure. Figure 13 This is a cross-sectional schematic diagram of a battery device in some modified embodiments of this application, omitting the heat insulation structure. In some embodiments, please refer to... Figure 12 and Figure 13 It is possible to design that the first wall 12 is connected to the second wall 13 on one side along the second direction.

[0097] Figure 14 This is a cross-sectional schematic diagram of a battery device in some embodiments of this application, omitting the heat insulation structure. In some embodiments, such as Figures 3 to 11 , Figure 14 It can be designed that the first wall 12 is connected to the second wall 13 on both sides along the second direction.

[0098] Connecting wall 14 is a transition structure used to connect the first wall 12 and the second wall 13. Figure 4 In this structure, the lower end of the connecting wall 14 is connected to the lower of the first wall 12 and the second wall 13 (i.e., the first wall 12), and the upper end of the connecting wall 14 is connected to the upper of the first wall 12 and the second wall 13 (i.e., the second wall 13). The shape of the groove 17 depends on the shape and arrangement of the first wall 12 and the connecting wall 14.

[0099] "The thermal insulation structure 20 is at least covered on the first wall 12" can be understood as the entire thermal insulation structure 20 being covered on the first wall 12, or it can be understood as a portion of the thermal insulation structure 20 being covered on the first wall 12, with the remaining portion of the thermal insulation structure 20 being covered on the connecting wall 14 or other locations on the main body of the box 10.

[0100] Compared with the technical solutions where the cross-sectional shape of the groove 17 is "U" or "V", this embodiment sets the box body 10 to include a first wall 12 and a connecting wall 14. The groove wall (i.e., the first wall 12) facing its own opening of the groove 17 is a planar structure. When the heat insulation structure 20 is only covered on the first wall 12, it is also a planar structure, which makes the structure simple.

[0101] As can be seen from the preceding text, the battery device also includes multiple individual battery cells, and the arrangement of these individual battery cells within the housing cavity can vary.

[0102] According to some embodiments of this application, a plurality of battery cells of the battery device are housed within a receiving cavity and arranged to form at least two battery packs stacked along a first direction. A portion of each of the at least two battery packs is formed as a first battery pack 122, and the remainder is formed as a second battery pack 123. Each first battery pack 122 is arranged on the side of the first wall 12 facing away from the second wall 13. At least a portion of each second battery pack 123 is housed within the housing body 10, and the second battery pack 123 is arranged on at least one side of the recess 17 in the second direction.

[0103] Please continue reading. Figures 12 to 14The battery pack consists of two battery packs stacked along a first direction. The lower battery pack is the first battery pack 122, and the upper battery pack is the second battery pack 123, meaning the first battery pack 122 is located below the second battery pack 123. Of course, in other embodiments of this application, the number of battery packs can also be three, four, five, or more. Figure 14 In the view shown, the battery pack located below the first wall 12 is the first battery pack 122, and the battery pack located to the left and / or right of the first wall 12 is the second battery pack 123.

[0104] In this embodiment, the main body 10 is a hollow structure open on one side. The main body 10 has a cavity that opens towards the first housing 110a, and at least a portion of each of the second battery packs 123 is accommodated within the cavity. Figures 12 to 14 The first housing 110a can also be a hollow structure open on one side. As an example, each of the first battery packs 122 can be entirely housed within the first housing 110a. In this example, each of the second battery packs 123 can be entirely housed within the cavity enclosed by the housing body 10, or, a portion of the second battery pack 123 closest to the first battery pack 122 can be housed within the first housing 110a. As an example, a portion of the first battery pack 122 closest to the second battery pack 123 can be housed within the first housing 110a, and a portion within the cavity of the housing body 10. Each of the second battery packs 123 can be entirely housed within the cavity enclosed by the housing body 10. It is understandable that when there are multiple second battery packs 123, the second battery pack 123 closest to the first battery pack 122 refers to the lowest second battery pack 123 among the multiple second battery packs 123; similarly, when there are multiple first battery packs 122, the first battery pack 122 closest to the second battery pack 123 refers to the highest first battery pack 122 among the multiple first battery packs 122.

[0105] In this embodiment, based on the groove 17 formed on the outer surface of the box body 10, the battery cells inside the box are arranged in multiple layers, and the second battery pack 123 housed in the box body 10 is located on at least one side of the groove 17 in the second direction. This allows the arrangement of the battery cells to be adapted to the shape and structure of the box body 10, which is beneficial to improving the utilization rate of the internal space of the box and optimizing the battery energy density.

[0106] In some embodiments, such as Figure 12 and Figure 13 As shown, the first wall 12 is connected to the second wall 13 on one side along the second direction, and the groove 17 is located at one end of the box body 10 along the second direction. In this example, "the second battery pack 123 is arranged on at least one side of the groove 17 in the second direction" means that all the battery cells contained in the second battery pack 123 are arranged on the same side of the groove 17 in the second direction.

[0107] According to some embodiments of this application, such as Figure 14 As shown, the first wall 12 is connected to two second walls 13 on both sides along the second direction. The second battery pack 123 can be configured to include a first battery module 1231 and a second battery module 1232. The first battery module 1231 and the second battery module 1232 correspond to the two second walls 13 and are respectively located on the side of the corresponding second wall 13 facing the first housing 110a. Along the second direction, the first battery module 1231 and the second battery module 1232 are respectively located on both sides of the groove 17.

[0108] exist Figure 14 In this example, the left side of the first wall 12 is connected to a second wall 13 via a connecting wall 14, and the right side of the first wall 12 is connected to another second wall 13 via another connecting wall 14. The first wall 12 and the two connecting walls 14 together define the groove 17. In the second direction, the groove 17 can be located near the left / right end of the box body 10, or, as... Figure 14 As shown, in the second direction, the groove 17 can be located in the middle of the box body 10.

[0109] The second battery pack 123 is divided into two battery modules, each consisting of multiple individual battery cells arranged together. The two battery modules correspond one-to-one with the two second walls 13. Figure 14 In the middle, the one on the left is the first battery module 1231, and the one on the right is the second battery module 1232. The first battery module 1231 is located below a second wall 13, and the second battery module 1232 is located below another second wall 13.

[0110] In this embodiment, the first wall 12 is connected to a connecting wall 14 and a second wall 13 on both sides along the second direction, and the first wall 12 and the two connecting walls 14 together define the groove 17. Based on this, in this embodiment, the battery cells constituting the second battery pack 123 are arranged on one side of the groove 17 along the second direction, and the remaining parts are arranged on the other side of the groove 17 along the second direction. In this way, the second battery pack 123 can be reasonably laid out according to the structure of the box body 10, so that the arrangement of the battery cells can be adapted to the shape and structure of the box body 10, which is conducive to improving the utilization rate of the internal space of the box and optimizing the battery energy density.

[0111] Based on some embodiments of this application, please continue to refer to... Figures 12 to 14 A first gap 111 exists between the first battery pack 122, which is closest to the second battery pack 123, and the first wall 12, in the first direction.

[0112] As described above, when there are multiple first battery packs 122, the first battery pack 122 closest to the second battery pack 123 refers to the uppermost first battery pack 122 among the multiple first battery packs 122. For example... Figures 12 to 14 As shown, when there is only one first battery pack 122, the bottommost battery pack is the first battery pack 122 that is closest to the second battery pack 123. "The first battery pack 122 that is closest to the second battery pack 123 and the first wall 12 have a first gap 111 in the first direction" means that the first battery pack 122 that is closest to the second battery pack 123 does not contact the first wall 12, and there is a certain distance between them. The size of the first gap 111 can be set according to actual needs.

[0113] It is understandable that in the embodiment where the first battery pack 122, which is closest to the second battery pack 123, is in direct contact with the first wall 12, a heat transfer path between the first battery pack 122 and the heat source is: insulation structure 20 - first wall 12 - first battery pack 122. This embodiment prevents the first battery pack 122, which is closest to the second battery pack 123, from directly contacting the first wall 12. The distance between the first battery pack 122 and the heat source in the first direction is increased, and a heat transfer path between the first battery pack 122 and the heat source is: insulation structure 20 - first wall 12 - medium within the first gap 111 - first battery pack 122. This increased heat transfer step reduces the amount of heat transferred from the heat source to the first battery pack 122, further improving heat damage protection. The medium within the first gap 111 can be air or a component arranged within the first gap 111 (such as an insulation pad or the metal liner 40 mentioned below).

[0114] It is understandable that the structure of the connecting wall 14 is varied, allowing the outer surface of the housing body 10 to define grooves 17 of various shapes. For ease of description, the end of the connecting wall 14 connected to the first wall 12 is defined as the first end, and the end of the connecting wall 14 connected to the second wall 13 is defined as the second end. Since the first wall 12 is located on the side of the second wall 13 facing the first housing body 110a, along the first direction, the first end is closer to the first housing body 110a than the second end. Figures 12 to 14 In the middle, the first end is located below the second end.

[0115] In some embodiments, such as Figure 12 As shown, the connecting wall 14 extends along a first direction from the first end to the second end. In this example, the second battery pack 123 is arranged on one side of the connecting wall 14 in the second direction and can contact the connecting wall 14.

[0116] According to some embodiments of this application, such as Figure 13 and Figure 14As shown, in the second direction, the first end is closer to the first wall 12 than the second end. Taking a plane perpendicular to the first direction as the projection plane (not shown in the figure) and the first direction as the projection direction, the projection of the second battery pack 123 does not coincide with the projections of the first wall 12 and the connecting wall 14.

[0117] "In the second direction, the first end is closer to the first wall 12 than the second end" is intended to illustrate that the first end and the second end are arranged at an interval in the second direction, and the second end is located on the side of the first end that is farther away from the first wall 12. Figure 13 In the middle, the first end is located to the left of the second end, and from the first end to the second end, the connecting wall 14 extends to the right of the first wall 12 away from the first wall 12.

[0118] In the accompanying drawings of this application, the projection plane is parallel to the XY plane. The projection plane can be understood as being parallel to the surface of the bottom wall 113 of the first housing 110a, with the bottom wall 113 facing the open side of the housing body 10. The statement that "the projection of the second battery pack 123 does not coincide with the projections of the first wall 12 and the connecting wall 14" is intended to illustrate that the second battery pack 123 is not located below the first wall 12 and the connecting wall 14; the second battery pack 123 is directly opposite the second wall 13. Thus, the second battery pack 123 does not contact the first end of the first wall 12, and a second gap 112 exists between them in the second direction.

[0119] As can be seen from the above description, in the embodiment where the projection of the second battery pack 123 does not coincide with the projection of the first wall 12 and the connecting wall 14, and there is a first gap 111 between the first battery pack 122, which is closest to the second battery pack 123, and the first wall 12, no battery cells are arranged between the surface of the connecting wall 14 facing the first housing 110a and the plane where the first wall 12 is located.

[0120] In some alternative embodiments of this application, in the second direction, the first end is closer to the first wall 12 than the second end. Using a plane perpendicular to the first direction as the projection plane and the first direction as the projection direction, the projection of the second battery pack 123 does not coincide with the first wall 12 but partially coincides with the projection of the connecting wall 14. That is, the second battery pack 123 is not located below the first wall 12, but a portion of the second battery pack 123 is located below the connecting wall 14, such that battery cells are arranged between the surface of the connecting wall 14 facing the first housing 110a and the plane containing the first wall 12. To accommodate the structure of the connecting wall 14, the height of the battery cells at this location is different from the height of the battery cells located below the second wall 13, or the shape of the battery cells at this location matches the connecting wall 14.

[0121] In an embodiment where the projection of the second battery pack 123 does not coincide with the projections of the first wall 12 and the connecting wall 14, on the one hand, no battery cells need to be arranged between the surface of the connecting wall 14 facing the first housing 110a and the plane where the first wall 12 is located. In this way, the second battery pack 123 can be composed of multiple battery cells with the same structure and size, without requiring some battery cells to be adapted to the connecting wall 14. The arrangement of battery cells is more regular and has better consistency. On the other hand, since the first end is closer to the first wall 12 in the second direction than the second end, there is a second gap 112 between the second battery pack 123 and the first end of the first wall 12 in the second direction. In this way, when the heat source is arranged so that its orthogonal projection along the first direction falls within the first wall 12, it is beneficial to increase the distance between the first battery pack 122 and the heat source in the second direction. This prevents the heat from the heat source from being directly transferred to the second battery pack 123 through the second wall 13. The heat transferred from the heat source to the second battery pack 123 can be reduced, further improving the heat damage protection capability.

[0122] From the first end to the second end, the connecting wall 14 can gradually move away from the first wall 12 in both the first and second directions, or it can partially move away from the first wall 12 in the first direction and the remaining part gradually moves away from the first wall 12 in the second direction. This embodiment does not limit this.

[0123] In some embodiments, such as Figure 13 As shown in (b), the connecting wall 14 extends obliquely upward from the first end to the second end, and the connecting wall 14 is inclined to the first wall 12.

[0124] According to some embodiments of this application, the connecting wall 14 may be configured to include a first connecting wall 141, a second connecting wall 142 and a third connecting wall 143, wherein the first wall 12, the first connecting wall 141, the second connecting wall 142, the third connecting wall 143 and the second wall 13 are connected in turn in sequence.

[0125] The first connecting wall 141 and the second connecting wall 142 form a first step 151, and the third connecting wall 143 and the second wall 13 form a second step 152. The second step 152 protrudes relative to the first step 151 in a direction away from the first box body 110a, and the second step 152 is located above the first step 151. The box body 10 of this embodiment can be obtained by stamping.

[0126] The first connecting wall 141 can be perpendicularly connected to the first wall 12 and the second connecting wall 142, or it can be connected by only intersecting non-perpendicular connections. For example, the first connecting wall 141 can be connected to the first wall 12 and the second connecting wall 142 at angles of 30°, 60°, 80°, 120°, 150°, or 175°. Similarly, the third connecting wall 143 can be perpendicularly connected to the second connecting wall 142 and the second wall 13, or it can be connected by only intersecting non-perpendicular connections. For example, the third connecting wall 143 can be connected to the second connecting wall 142 and the second wall 13 at angles of 30°, 60°, 80°, 120°, 150°, or 170°. As an example, such as... Figure 13 As shown in (a), any two adjacent vertically arranged members of the first wall 12, the first connecting wall 141, the second connecting wall 142, the third connecting wall 143, and the second wall 13. In some embodiments, as shown in (a) Figure 6 and Figure 7 As shown, the connection between any two adjacent walls 12, 141, 142, 143, and 13 can be smoothly transitioned, that is, the connection between two adjacent walls is provided with an arc-shaped chamfer, which helps to reduce stress concentration.

[0127] According to some embodiments of this application, the heat insulation structure 20 is applied to the first wall 12; or, the heat insulation structure 20 is applied to the first wall 12 and at least a portion of the connecting wall 14; or, the heat insulation structure 20 is applied to the first wall 12, the connecting wall 14 and at least a portion of the second wall 13.

[0128] In some embodiments, such as Figures 8 to 11 As shown, the entire heat insulation structure 20 is covered on the first wall 12; in other words, the heat insulation structure 20 is only covered on the first wall 12.

[0129] In other embodiments, the thermal insulation structure 20 is configured to cover the first wall 12 and at least a portion of the connecting wall 14. That is, the thermal insulation structure 20 covers not only the first wall 12, but also a portion or all of the connecting wall 14.

[0130] In some other embodiments, such as Figures 2 to 7 As shown, the thermal insulation structure 20 is configured to cover part or all of the first wall 12, the connecting wall 14, and the second wall 13 simultaneously.

[0131] With this technical solution, the heat insulation structure 20 can be arranged in various ways to separate the main body 10 of the box from the heat source. The heat insulation structure 20 can be arranged flexibly according to the needs.

[0132] According to some embodiments of this application, the first functional layer 21 and the second functional layer 22 are configured to conform to the groove 17.

[0133] The phrase "the first functional layer 21 and the second functional layer 22 are configured to conform to the shape of the groove 17" is intended to illustrate that the first functional layer 21 and the second functional layer 22 can be configured to have the same shape according to the shape of the groove 17, so that the heat insulation structure 20 is adapted to the shape of the groove 17. For example, with... Figure 6 The view shown is in the cross-sectional direction. The cross-sectional shape of the groove 17 along this cross-sectional direction is "U" shaped, and correspondingly, the cross-sectional shape of the heat insulation structure 20 along this cross-sectional direction is also "U" shaped. Taking the second functional layer 22 as a heat radiation layer made of metal material as an example, the second functional layer 22 can be obtained by stamping a metal sheet according to the shape of the groove 17, which is set in accordance with the shape of the groove 17.

[0134] In one specific embodiment, such as Figures 2 to 7 As shown, the connecting wall 14 includes a first connecting wall 141, a second connecting wall 142, and a third connecting wall 143. The first wall 12, the first connecting wall 141, the second connecting wall 142, the third connecting wall 143, and the second wall 13 are connected in sequence by bends. When the first functional layer 21 is a heat insulation layer and the second functional layer is a heat radiation layer, the second functional layer 22 is configured to include a heat radiation main body 223, a first heat radiation part 224, a second heat radiation part 225, and a third heat radiation part 226. The heat radiation main body 223 is connected to the first heat radiation part 224 on at least one side along the second direction. The first heat radiation part 224, the second heat radiation part 225, and the third heat radiation part 226 are connected in sequence by bends. The first functional layer 21 is configured to include a heat-insulating main body 212, a first sub-heat-insulating part 213, a second sub-heat-insulating part 214, and a third sub-heat-insulating part 215. The heat-insulating main body 212 is connected to the first sub-heat-insulating part 213 on at least one side along the second direction. The first sub-heat-insulating part 213, the second sub-heat-insulating part 214, and the third sub-heat-insulating part 215 are sequentially connected by turns. The heat-insulating main body 212 and the heat-radiating main body 223 are stacked and covered on the first wall 12. The first sub-heat-insulating part 213 and the first heat-radiating part 224 are stacked and covered on the first connecting wall 141. The second sub-heat-insulating part 214 and the second heat-radiating part 225 are stacked and covered on the second connecting wall 142. The third sub-heat-insulating part 215 and the third heat-radiating part 226 are stacked and covered on the third connecting wall 143.

[0135] In this embodiment, by matching the shape of the heat insulation structure 20 with the shape of the local area affected by the heat source in the envelope of the battery device, on the one hand, the heat insulation structure 20 can accurately cover the heat source area, improving the heat damage protection effect; on the other hand, the arrangement of the heat insulation structure 20 makes reasonable use of space and reduces space waste.

[0136] In some embodiments, the housing body 10, the first functional layer 21, and the second functional layer 22 are each formed independently. That is, the housing body 10, the first functional layer 21, and the second functional layer 22 are prepared separately and then assembled and connected. In this document, assembly and connection include, but are not limited to: screwing, snap-fitting, welding, bonding, riveting, pinning, and interference fit. Compared with the related art where the crosslinking layer, fire-retardant silicone layer, and PCM layer of the housing are all fixed by a crosslinking structure, in the technical solution of this embodiment, under the premise of achieving heat damage protection, the housing body 10, the first functional layer 21, and the second functional layer 22 are not fixed by a crosslinking structure formed by a chemical reaction. The housing body 10, the first functional layer 21, and the second functional layer 22 are formed separately and then assembled and connected. This avoids the negative impact of fluctuations in chemical reaction on the stability of the connection structure, improves the production consistency of the second housing 110b, and makes the heat damage protection performance of the battery device more stable.

[0137] Furthermore, in this embodiment, since the main body 10, the first functional layer 21, and the second functional layer 22 are each formed independently, different materials and / or thicknesses of the first functional layer 21 and the second functional layer 22 can be used according to the weight requirements and heat protection needs of the battery device. Therefore, the heat insulation structure 20 has greater flexibility. By rationally designing the materials and / or thicknesses of the first functional layer 21 and the second functional layer 22, different heat protection needs can be met, thus minimizing material usage and reducing raw material costs. For example, when the battery device of this embodiment is used to form the power system of a plug-in hybrid heavy-duty vehicle (e.g., truck, van, logistics vehicle, bus), the exhaust pipe 400 of the heavy-duty vehicle is a heat source. Because the exhaust volume of the heavy-duty vehicle is larger, the exhaust pipe 400 generates more heat, and correspondingly, the heat protection requirements are higher. To achieve this heat protection requirement, the heat insulation layer can be made of a material with higher thermal resistance, and both the heat insulation layer and the heat radiation layer can be thicker.

[0138] In the battery device disclosed herein, the connection method between the heat insulation structure 20 and the main body 10 is not limited.

[0139] In some embodiments, the first functional layer 21 is a heat insulation layer, and the second functional layer 22 is a heat radiation layer made of metal. Both the main body 10 and the heat insulation layer are made of fiberglass. The main body 10 can be manufactured using injection molding. The molded main body 10 is then removed and placed into a secondary molding mold, and the first functional layer 21 is manufactured again using injection molding. Thus, the first functional layer 21 is injection molded onto the main body 10. Subsequently, the second functional layer 22 is formed by depositing metal material onto the surface of the first functional layer 21 using physical vapor deposition. Using this technical solution, the main body 10, the first functional layer 21, and the second functional layer 22 are integrally formed.

[0140] In some embodiments, the thermal radiation layer is detachably connected to the housing body 10. That is, the thermal radiation layer and the housing body 10 are manufactured independently, and then assembled together; they can also be disassembled and separated. In this document, detachable connections include, but are not limited to, screw connections, snap-fit ​​connections, interference fits, and pin connections. In this embodiment, because the thermal radiation layer is detachable, if the thermal radiation layer is damaged by heat from a heat source during long-term operation of the battery device (e.g., surface oxidation, localized bulging), the thermal radiation layer can be replaced without replacing the entire second housing 110b, thus reducing maintenance costs.

[0141] The following text will take the example of the thermal radiation layer as the second functional layer 22 and the insulation layer as the first functional layer 21 to describe in detail the various possible ways to achieve the detachable connection between the second functional layer 22 (i.e., the thermal radiation layer) and the main body 10 of the box.

[0142] In the first possible implementation, such as Figures 2 to 11 The second housing 110b may further include a first flange 16 disposed around the outer periphery of the housing body 10 and connected to the housing body 10. A groove 17 penetrates the housing body 10 along a third direction, and the two ends of the second functional layer 22 along the third direction are respectively fastened to the first flange 16 and the first housing 110a by locking members 70. The third direction intersects with the first direction.

[0143] The third direction can be perpendicular to or at an angle to the first direction, and the third direction can also be perpendicular to or at an angle to the second direction. As an example, the box is rectangular in shape, with the first, second, and third directions perpendicular to each other. In this case, the third direction can be referred to as the width or length direction of the box. In the accompanying drawings of this application, the third direction can be referred to as the Y direction.

[0144] The first flange 16 is an annular flange structure used to achieve connection, and the first flange 16 is connected to the end of the housing body 10 facing the first housing body 110a. Figure 4 The first flange 16 extends away from the receiving cavity and is connected to the lower end of the enclosure. The first flange 16 and the enclosure body 10 can be integrally formed or separately formed and then assembled together. As mentioned above, the enclosure body 10 also includes a surrounding wall 11, which is connected to the first wall 12 and the second wall 13. The surrounding wall 11 extends towards the first enclosure body 110a relative to the first wall 12 and the second wall 13. The first flange 16 is connected to the end of the surrounding wall 11 facing the first enclosure body 110a.

[0145] exist Figure 4 and Figure 5In the second functional layer 22, both sides along the third direction are formed as connecting edges 221. The connecting edges 221 extend above the first flange 16 and overlap the first flange 16. The first flange 16 has a first connecting hole 161 that penetrates its own thickness, and the connecting edges 221 have a second connecting hole 2211 that penetrates its own thickness. The locking member 70 can pass through the first connecting hole 161 and the second connecting hole 2211 from top to bottom to be fastened to the first housing 110a. The locking member 70 can be, but is not limited to, bolts, screws, pins, etc.

[0146] In some embodiments, such as Figure 4 and Figure 7 As shown, the heat insulation structure 20 is simultaneously covered on the first wall 12, the connecting wall 14, and the second wall 13. In this example, the portion of the heat radiation layer covering the first wall 12 extends along the two sides in the third direction to the top of the first flange 16. The portion of the heat radiation layer covering the first wall 12 is the heat radiation body 223.

[0147] In this embodiment, the first functional layer 21 (i.e., the insulation layer) can be fixed in various ways. For example, the insulation layer can be fixedly connected to the main body 10 in a non-removable manner, but not connected to the second functional layer 22. In this example, the second functional layer 22 can be replaced separately. Alternatively, the insulation layer can be fixedly connected to the second functional layer 22 in a non-removable manner, but not connected to the main body 10. In this example, the insulation structure 20 can be replaced as a whole, but the first functional layer 21 and the second functional layer 22 cannot be replaced separately. Another example is that the first functional layer 21 can be clamped and fixed between the second functional layer 22 and the main body 10. In other words, the first functional layer 21 is not connected to either the main body 10 or the second functional layer 22. In this example, if any of the main body 10, the first functional layer 21, or the second functional layer 22 is damaged, it can be replaced separately without replacing the entire second housing 110b, which helps to further reduce maintenance costs.

[0148] With this technical solution, since the groove 17 penetrates the main body 10 along the third direction, a first opening and a second opening are formed at both ends of the groove 17 along the third direction, respectively. In this way, the heat source can extend into the groove 17 through the first opening and exit through the second opening, facilitating the placement of the heat source within the groove 17. Furthermore, in this embodiment, by setting the second functional layer 22 to be securely connected to the first flange 16 and the first housing 110a at both ends along the third direction via locking members 70, the locking members 70 connecting the first housing 110a and the second housing 110b can simultaneously lock the first housing 110a and the heat insulation structure 20. This not only saves on the number of locking members 70 but also reduces assembly steps, thus improving assembly efficiency.

[0149] As described above, the first functional layer 21 can be fixedly connected to the housing body 10 in a non-removable manner. Exemplarily, an adhesive layer can be provided on the side of the first functional layer 21 facing away from the second functional layer 22 along a first direction, and the first functional layer 21 is connected to the housing body 10 through the adhesive layer. As an example, the adhesive layer includes a substrate and an adhesive coated on both sides of the substrate. The adhesive can be a high-temperature resistant adhesive such as silicone, polyimide (PI) adhesive, or inorganic ceramic adhesive. In other words, the adhesive layer is double-sided tape. As an example, adhesive can be applied to the surface of the second functional layer 22 facing the first housing body 110a, and then dried to form the adhesive layer. In this embodiment, the first functional layer 21 is connected to the housing body 10 through the adhesive layer, which helps to improve the installation stability of the first functional layer 21, enabling the first functional layer 21 to reliably suppress heat conduction to the housing body 10.

[0150] In the second possible implementation, such as Figures 8 to 11 The battery device may also include fasteners 30, at least a portion of which are first fasteners 30a, and the heat insulation structure 20 is fastened to the housing body 10 via the first fasteners 30a.

[0151] The fastener 30 can be, but is not limited to, bolts, screws, pins, etc. "The thermal insulation structure 20 is fastened to the main body 10 of the box via the first fastener 30a" can be understood as the thermal insulation structure 20 being fastened to the first wall 12 via the first fastener 30a, or it can be understood as the thermal insulation structure 20 being fastened to the connecting wall 14 via the first fastener 30a, or it can be understood as the thermal insulation structure 20 being fastened to the second wall 13 via the first fastener 30a.

[0152] In this embodiment, the first functional layer 21 has a through hole extending through its own thickness, and the second functional layer 22 has a through hole extending through its own thickness. The through hole and the through hole are interconnected. The first fastener 30a passes sequentially through the through hole of the second functional layer 22, the through hole of the first functional layer 21, and the housing body 10 before extending into the receiving cavity. In this example, the head 301 of the first fastener 30a is located on the side of the second functional layer 22 opposite to the first functional layer 21. In this text, when the fastener 30 is a bolt, the head 301 of the fastener 30 refers to the bolt head. The number of through holes is the same as the number of first fasteners 30a and corresponds one-to-one.

[0153] It should be noted that in the embodiment in which the two ends of the heat radiation layer along the third direction are respectively fastened to the first flange 16 and the first housing 110a by locking members 70, when the heat radiation layer, the first flange 16 and the first housing 110a are all metal parts, the three-layer metal structure is locked by locking members 70. During the use of electrical equipment, there is vibration, which is transmitted to the locking members 70. Under the action of vibration, the locking members 70 are more likely to rotate in the opposite direction and generate untwisting, which reduces the preload of the locking members 70 and affects the sealing performance of the battery device.

[0154] In this embodiment, the heat insulation structure 20 is fastened to the main body 10 via the first fastener 30a, instead of using the locking member 70 connecting the first housing 110a and the second housing 110b to lock the heat insulation structure 20 and the main body 10. This avoids the fastener 30 connecting the heat insulation structure 20 and the main body 10 from twisting and affecting the sealing performance of the battery device. Moreover, compared with the technical solution where the first functional layer 21 has an adhesive layer on the side facing away from the second functional layer 22, in this embodiment, the first functional layer 21 is fixed between the main body 10 and the second functional layer 22 by the first fastener 30a. This avoids the connection reliability of the first functional layer 21 being affected by the adhesive layer failing due to heat.

[0155] According to some embodiments of this application, the housing body 10 includes a first wall 12 that forms a recess 17 and is close to a heat source. The surface of the first wall 12 facing away from the first housing body 110a faces the heat source. Fasteners 30 extend from the side of the first wall 12 facing away from the first housing body 110a along a first direction into the receiving cavity. The heat insulation structure 20 is fastened to the first wall 12 by the first fasteners 30a.

[0156] Based on the preceding description, in the case where the first wall 12 and the connecting wall 14 together enclose the groove 17, please refer to... Figure 3 and Figure 8 The heat source can be arranged such that its orthographic projection on the main body 10 along the first direction coincides with the first wall 12 but not with the connecting wall 14. That is, the heat source is directly opposite the first wall 12 along the first direction but not directly opposite the connecting wall 14. It can be understood that the first wall 12 is the main structure in the wall that forms the groove 17 that is close to and affected by the heat source.

[0157] exist Figure 9 In this embodiment, the fastener 30 extends from above the first wall 12 along a first direction to the space below the first wall 12 in the receiving cavity. For example, in a technical solution where the first battery pack 122 closest to the second battery pack 123 has a first gap 111 with the first wall 12 in the first direction, the first fastener 30a passes sequentially through the second functional layer 22, the first functional layer 21, and the first wall 12 before extending into the first gap 111. That is, the first gap 111 can accommodate the first fastener 30a, preventing the first fastener 30a from interfering with the first battery pack 122.

[0158] Compared to the technical solution where the heat insulation structure 20 is connected to the connecting wall 14 via the first fastener 30a, this embodiment connects the structure in the groove wall of the groove 17 that is mainly close to the heat source (i.e., the first wall 12) to the heat insulation structure 20 via the first fastener 30a. As the structure that is mainly close to the heat source, the first wall 12 has a relatively large area, which facilitates the arrangement of the fasteners 30.

[0159] According to some embodiments of this application, a plurality of first fasteners 30a are provided to form at least one first array structure, and the plurality of first fasteners 30a included in the first array structure are arranged at intervals along the circumference of the first wall 12.

[0160] Figure 9 The diagram shows a first array structure with 12 first fasteners 30a. Of course, in other embodiments, the number of first fasteners 30a in the first array structure can be 2 to 11, 13, 14, or more. Figures 8 to 11 There can be one first array structure, or there can be multiple first array structures, and the multiple first array structures can be arranged coaxially.

[0161] This technical solution increases the number of first fasteners 30a, which helps to improve the connection reliability between the heat insulation structure 20 and the box body 10, and the arrangement of the first fasteners 30a is more regular.

[0162] Figure 15 For along Figure 11 A cross-sectional view along the AA direction. Figure 16 for Figure 15 A partially enlarged schematic diagram, Figure 17 For along Figure 11 A cross-sectional view along the BB direction. Figure 18 for Figure 17 A partially enlarged schematic diagram. Please refer to some embodiments of this application. Figure 10 , Figures 15 to 18 The second housing 110b may also include a metal liner 40 and a rivet nut 31 disposed in the receiving cavity. The metal liner 40 is provided with a first mounting hole, which penetrates the metal liner 40 along a first direction. The rivet nut 31 is fitted into the first mounting hole and is connected to the fastener 30.

[0163] Both the metal liner 40 and the rivet nut 31 are located below the first wall 12, with the metal liner 40 stacked on top of the first wall 12. The metal liner 40 is made of metal and is a plate-shaped component used for functional assistance, located on the side of the first wall 12 facing away from the heat insulation structure 20. The rivet nut 31 can be, but is not limited to, a press-fit nut, an expansion nut, a pull nut, etc. In this embodiment, as... Figure 15 and Figure 16 As shown, the first fastener 30a passes through the second functional layer 22 and the first functional layer 21 in sequence, and is then threadedly connected to the rivet nut 31. The number of first mounting holes and the number of rivet nuts 31 can be the same as the number of fasteners 30, with each rivet nut 31 corresponding to one first mounting hole and one fastener 30.

[0164] It is understood that both the second functional layer 22 and the first wall 12 are thin-walled structures. In this embodiment, by using a metal backing plate 40 and a rivet nut 31, it is not necessary to pre-tap internal threads on the first wall 12. The metal backing plate 40 provides support and a mounting base for the rivet nut 31, and the rivet nut 31 can provide sufficient thread length to provide a reliable internal thread connection between the thermal insulation structure 20 and the first wall 12.

[0165] According to some embodiments of this application, the second housing 110b may further include an elastic sealing gasket 50 disposed between the first wall 12 and the metal liner 40, the elastic sealing gasket 50 having a second mounting hole through which the fastener 30 passes.

[0166] The elastic sealing gasket 50 is disposed within the receiving cavity and stacked between the first wall 12 and the metal liner 40. The material of the elastic sealing gasket 50 may be at least one of rubber (e.g., silicone, fluororubber), foam material (e.g., foam), and thermoplastic elastomer (TPE).

[0167] The second mounting hole penetrates the elastic sealing gasket 50 along the first direction and communicates with the first mounting hole. The number of second mounting holes can be the same as the number of fasteners 30, with each second mounting hole corresponding to one fastener 30. The second mounting hole can be circular, rectangular, elliptical, strip-shaped, etc. In some embodiments, both the first and second mounting holes can be circular, and in this example, the diameter of the second mounting hole is greater than or equal to the diameter of the first mounting hole.

[0168] Due to the influence of manufacturing and assembly processes, slight deformations or unevenness may occur on the surface of the first wall 12 facing the metal liner 40 and the surface of the metal liner 40 facing the first wall 12. Using this technical solution, the elastic sealing gasket 50 has a certain degree of elasticity and compressibility, enabling it to adapt to these slight deformations through its own deformation. This ensures good filling of the gap between the first wall 12 and the metal liner 40, preventing the receiving cavity from communicating with the external environment of the housing through the gap, the through hole through which the first fastener 30a passes, and the through hole. This helps to improve the airtightness of the battery device caused by the first fastener 30a passing through the second functional layer 22, the first functional layer 21, and the first wall 12.

[0169] According to some embodiments of this application, the rivet nut 31 can be a pull rivet nut. For example... Figures 15 to 18 As shown, the rivet nut can be configured to include a shank 311 and a second flange 312, the shank 311 extending along a first direction, the second flange 312 surrounding the outer periphery of the shank 311, the second flange 312 and the end of the shank 311 facing the first functional layer 21 ( Figure 16The second flange 312 is installed in the second mounting hole (with the middle part at the top). Using this technical solution, the second mounting hole of the elastic sealing gasket 50 can accommodate the second flange 312.

[0170] The rod portion 311 has a third connecting hole at its center, and the wall of the third connecting hole has an internal thread that mates with the fastener 30. A second flange 312 is connected to the end of the rod portion 311 facing the first wall 12, and the second flange 312 extends in a direction away from the centerline of the rod portion 311. In some embodiments, both the first mounting hole and the second mounting hole can be circular. The diameter of the second mounting hole is larger than the diameter of the first mounting hole, and the diameter of the second mounting hole is greater than or equal to the outer diameter of the second flange 312. The outer diameter of the second flange 312 is larger than the diameter of the first mounting hole, preventing the second flange 312 from passing through the first mounting hole, thus allowing the rivet nut to be stably installed on the metal liner 40.

[0171] The phrase "the second flange 312 is installed in the second mounting hole" should be interpreted broadly. For example, it can be understood as the second flange 312 being fitted into the entire second mounting hole, in which case the dimension of the second flange 312 along the first direction is equal to the dimension of the second mounting hole along the first direction; or, it can be understood as the second flange 312 being fitted into a portion of the second mounting hole, in which case the dimension of the second flange 312 along the first direction is smaller than the dimension of the second mounting hole along the first direction.

[0172] According to some embodiments of this application, when the second flange 312 is fitted into a portion of the second mounting hole, such as Figures 15 to 18 As shown, the second housing 110b may further include a bushing 60, and the first wall 12 is provided with a third mounting hole communicating with the second mounting hole. The bushing 60 is installed in the second mounting hole and the third mounting hole, with one end of the bushing 60 facing the first housing 110a. Figure 16 The second flange 312 (lower end) abuts against the rivet nut 31, and the fastener 30 passes through the bushing 60.

[0173] The third mounting hole penetrates the first wall 12 along the first direction and communicates with the second mounting hole. The number of third mounting holes and the number of bushings 60 can be consistent with the number of fasteners 30 and correspond one-to-one. The material of the bushings 60 can be, but is not limited to, metal, plastic, etc. Figure 16 In the middle section, from top to bottom, the through hole, the through hole, the third mounting hole, the second mounting hole, and the first mounting hole are arranged sequentially and are interconnected. The bushing 60 passes through the third mounting hole and extends into the second mounting hole to abut against the second flange 312.

[0174] In some embodiments, the bushing 60 may be a tubular structure, the dimension of the bushing 60 along the first direction is the first dimension, the difference between the thickness of the elastic sealing gasket 50 (i.e. the dimension of the elastic sealing gasket 50 along the first direction) and the dimension of the second flange 312 along the first direction is the second dimension, and the dimension of the third mounting hole along the first direction is the third dimension. The first dimension may be equal to the sum of the second dimension and the third dimension.

[0175] In some embodiments, such as Figure 16 and Figure 18 As shown, the bushing 60 can be configured to include a cylinder 61 and a third flange 62. The cylinder 61 extends along a first direction, and the third flange 62 is connected to the top end of the cylinder 61 and extends in a direction away from the centerline of the cylinder 61 to protrude from the outer peripheral surface of the cylinder 61. As can be seen from the preceding text, the first functional layer 21 is provided with a through hole that penetrates the first functional layer 21 along the first direction, and the third flange 62 can be accommodated within the through hole.

[0176] In this embodiment, a bushing 60 is introduced into the connection path of the fastener 30. During the pre-tightening process of the fastener 30, the abutment relationship between the bushing 60 and the rivet nut 31 establishes a rigid force channel between the first wall 12 and the metal backing plate 40 to transmit the pre-tightening force, thus preventing the elastic sealing gasket 50 from participating in the transmission of the pre-tightening force. In this way, the pre-tightening force attenuation caused by the compression and creep of the elastic sealing gasket 50 can be reduced, which helps to improve the connection reliability of the fastener 30.

[0177] According to some embodiments of this application, at least a portion of the fasteners 30 are second fasteners 30b and arranged to form at least one second array structure, wherein the second array structure includes a plurality of second fasteners 30b arranged sequentially at intervals along the circumference of the first wall 12. See also... Figure 17 and Figure 18 The head 301 of each second fastener 30b is located on the side of the second functional layer 22 facing the first housing 110a. Furthermore, all first fasteners 30a are located inside the second array structure.

[0178] Figure 9 The diagram shows a second array structure with 14 second fasteners 30b. Of course, in other embodiments, the number of second fasteners 30b can be 2 to 13, 15, 16, or more. For example... Figures 8 to 11 As shown, there can be one second array structure, or there can be multiple second array structures, and the multiple second array structures are arranged coaxially.

[0179] The number of through holes is consistent with the number of fasteners 30 and corresponds one-to-one. Some through holes are used as first through holes and the rest are used as second through holes 211.

[0180] The number of first through holes corresponds one-to-one with the number of first fasteners 30a. The head 301 of each first fastener 30a is located on the side of the second functional layer 22 opposite to the first functional layer 21, and each first fastener 30a passes through the corresponding first through hole. In some embodiments, please refer to... Figure 16 The second housing 110b also includes a bushing 60, which includes a cylinder 61 and a third flange 62. The first through hole can be configured to include a first hole segment and a second hole segment arranged sequentially along a first direction. The first hole segment is located above the second hole segment, and the diameter of the first hole segment is smaller than that of the second hole segment. In other words, the first through hole is a stepped hole. Furthermore, the third flange 62 is located within the second hole segment. The first fastener 30a passes through the through hole and the first hole segment of the first through hole from top to bottom, then passes through the bushing 60, and then extends into and engages with the rivet nut. Since the third flange 62 of the bushing 60 corresponding to the first fastener 30a is located within the first through hole, this can also have a positive effect on reducing the transmission of the preload force of the first functional layer 21 in the first fastener 30a, thereby helping to reduce the preload force attenuation caused by the compression and creep of the first functional layer 21, and further improving the connection reliability of the first fastener 30a.

[0181] The number of second through holes 211 is consistent with the number of second fasteners 30b and corresponds one-to-one. Please refer to [link / reference]. Figures 8 to 11 ,as well as Figure 17 and Figure 18 The head 301 of each second fastener 30b is located on the side (lower side) of the second functional layer 22 facing the first housing 110a and is received within the corresponding second through hole 211. In some embodiments, please refer to... Figure 18 The second housing 110b also includes a bushing 60, which includes a cylindrical body 61 and a third flange 62. The third flange 62 of the bushing 60, which mates with the second fastener 30b, is accommodated within the second through hole 211. The first wall 12 is fixedly connected to the metal liner 40 via the second fastener 30b. During the pre-tightening process of the second fastener 30b, the first functional layer 21 does not participate in the transmission of the pre-tightening force of the second fastener 30b. In this embodiment, the diameter of the second through hole 211 may remain unchanged from one end (top) facing the second functional layer 22 to the other end (bottom) away from the second functional layer 22.

[0182] "All first fasteners 30a are located inside the second array structure" means that, compared to the individual second fasteners 30b included in the second array structure, the first fasteners 30a are closer to the center of the first wall 12. When the first fasteners 30a are arranged in the first array structure, the second array structure is arranged around the outer periphery of the first array structure.

[0183] An exemplary assembly process of the second housing 110b in this embodiment may include the following steps: Step 1, providing a metal liner 40 and an elastic sealing gasket 50, and stacking the elastic sealing gasket 50 on top of the metal liner 40. Step 2, providing a rivet nut, installing the rivet nut on the metal liner 40, and accommodating the second flange 312 of the rivet nut in the second mounting hole of the elastic sealing gasket 50. Step 3, providing the housing body 10, moving the entire assembly obtained in Step 2 to the lower side of the first wall 12, such that the elastic sealing gasket 50, the first wall 12, and the metal liner 40 are stacked, and the second mounting hole is aligned with the through hole of the first wall 12. Step 4, providing a bushing 60, moving the bushing 60 to the upper side of the first wall 12 and installing it in the second mounting hole and the third mounting hole. Step 5, providing a second fastener 30b, passing the second fastener 30b from top to bottom through the bushing 60 and connecting it to the rivet nut. Step 5: Provide a first functional layer 21, covering the upper surface of the first wall 12, and accommodate the head of the second fastener 30b within the second through hole 211. Step 6: Provide a second functional layer 22, covering the upper surface of the first functional layer 21. Step 7: Provide a first fastener 30a, passing it sequentially from top to bottom through the through hole, the first hole segment, and the bushing 60, before connecting it to the rivet nut.

[0184] In this technical solution, the first wall 12 is connected with multiple fasteners 30. Some of the fasteners 30 are formed as first fasteners 30a, which serve to connect the thermal insulation structure 20 and the first wall 12. Furthermore, some of the fasteners 30 are formed as second fasteners 30b, which do not penetrate the second functional layer 22, and multiple second fasteners 30b are arranged to form a second array structure. This eliminates the need for openings in the second functional layer 22 at the locations corresponding to the second fasteners 30b, preventing moisture and dust from the external environment from entering the enclosure through openings in the second functional layer 22 corresponding to the second fasteners 30b. This avoids airtightness issues caused by openings in the second functional layer 22 at the locations corresponding to the second fasteners 30b. Meanwhile, even if moisture and dust from the external environment reach the side of the first functional layer 21 away from the second functional layer 22 through the through hole and the first through hole, the second array structure surrounds the outside of the first fastener 30a, thus forming a barrier around the outer periphery of the first fastener 30a, making it difficult for moisture and dust to cross the second array structure and invade the interior of the box.

[0185] In summary, the second array structure can block moisture and dust entering from the first through hole in a direction perpendicular to the first direction. At the same time, since the second fastener 30b does not pass through the second functional layer 22, the second fastener 30b will not introduce new airtightness problems, which is conducive to further improving the airtightness of the battery device.

[0186] In some embodiments, such as Figure 17 and Figure 18 As shown, a receiving groove is formed on the surface of the second functional layer 22 facing the first housing 110a, and a portion of the head 301 of the second fastener 30b is received in the receiving groove, which is beneficial to avoid the head 301 of the second fastener 30b by using the receiving groove.

[0187] The method of forming the receiving groove is varied. In some embodiments, machining methods (e.g., bored or milled) can be used to remove a portion of the material from the surface of the second functional layer 22 facing the first housing 110a to form the receiving groove. In some embodiments, such as Figure 17 and Figure 18 As shown, a portion of the second functional layer 22 can be arched in the direction away from the first wall 12 to form a protrusion 222. The protrusion 222 defines a receiving groove on the side facing the first wall 12. In this way, the formation of the receiving groove does not involve the removal of material, which is beneficial to reduce the amount of material used in the second functional layer 22.

[0188] The following section takes the thermal radiation layer as the first functional layer 21 and the thermal insulation layer as the second functional layer 22 as an example to describe in detail the possible ways to connect the thermal insulation structure 20 with the main body 10 of the box.

[0189] According to some embodiments of this application, the first functional layer 21 (i.e., the heat radiation layer) is fastened to the first flange 16 and the first housing 110a at both ends along a third direction by locking members 70. In this example, the second functional layer 22 (i.e., the heat insulation layer) may have an adhesive layer on the side facing the first functional layer 21 along a first direction, and the second functional layer 22 is fixedly connected to the first functional layer 21 by the adhesive layer. In this embodiment, the heat insulation structure 20 can be replaced as a whole.

[0190] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0191] The electrical equipment includes vehicles (such as automobiles, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, power tools, etc. It is understood that the electrical equipment provided in this application, by employing any of the aforementioned battery devices, possesses all the beneficial effects of those battery devices, which will not be elaborated further here.

[0192] According to some embodiments of this application, the electrical device can be a hybrid power device (e.g., a PHEV). Figure 3 and Figure 8 As shown, the hybrid power equipment includes an exhaust system, which serves as a heat source.

[0193] In other words, the hybrid electric device can use the battery device described in the above embodiments to form a power system, which can improve the problem of performance degradation caused by the heat damage of the exhaust system to the battery device of the hybrid electric device. Specifically, the exhaust system includes an exhaust pipe 400, and the heat source can refer to the exhaust pipe 400.

[0194] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0195] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0196] Example 1 like Figures 2 to 7 As shown, the battery pack of a plug-in hybrid electric vehicle (PHEV) includes a first housing 110a (also referred to as the lower housing) and a second housing 110b (also referred to as the upper housing cover). The second housing 110b includes a main body 10 and a heat insulation structure 20. The main body 10 and the first housing 110a overlap each other along a first direction Z to jointly enclose a receiving cavity. The main body 10 includes a first wall 12, a second wall 13, and a connecting wall 14. The first wall 12 and the second wall 13 are arranged sequentially away from the first housing 110a along the first direction Z. The first wall 12 is connected to the second wall 13 on both sides along a second direction X. The first wall 12 is connected to the second wall 13 through the connecting wall 14. The connecting wall 14 includes a first connecting wall 141, a second connecting wall 142, and a third connecting wall 143. The first wall 12, the first connecting wall 141, the second connecting wall 142, the third connecting wall 143, and the second wall 13 are connected in sequence by turning. The first connecting wall 141 and the second connecting wall 142 form a first step 151, and the third connecting wall 143 and the second wall 13 form a second step 152. The first wall 12 and the two connecting walls 14 connected to it together define a groove 17. The groove 17 penetrates the main body 10 along the third direction Y. The two ends of the groove 17 along the third direction form a first opening and a second opening, respectively. The exhaust pipe 400 of the plug-in hybrid electric vehicle (PHEV) extends into the groove 17 through the first opening and then exits through the second opening.

[0197] The heat insulation structure 20 is located outside the receiving cavity and conforms to the groove 17. The heat insulation structure 20 includes a first functional layer 21 and a second functional layer 22 arranged sequentially away from the first housing 110a along a first direction. The first functional layer 21 is a heat insulation layer made of aerogel or heat insulation felt, and the second functional layer 22 is a heat radiation layer made of metal. Double-sided adhesive is provided on the side of the first functional layer 21 away from the second functional layer 22 along the first direction, and the first functional layer 21 is connected to the housing body 10 by the double-sided adhesive. The portion of the second functional layer 22 covering the first wall 12 extends to both ends along the third direction Y and overlaps the first flange 16. The portion of the second functional layer 22 covering the first wall 12 along the third direction Y is fastened to the first flange 16 and the first housing 110a by locking members 70.

[0198] like Figure 14 As shown, all the battery cells in the receiving cavity are arranged in a first battery pack 122 and a second battery pack 123 stacked along the first direction Z. The first battery pack 122 is housed in the first housing 110a and stacked below the second battery pack 123, and the first battery pack 122 and the first wall 12 have a first gap in the first direction Z. The second battery pack 123 is housed in the housing body and is divided into a first battery module 1231 and a second battery module 1232 by a groove 17. The first battery module 1231 and the second battery module 1232 are located on both sides of the groove 17 along the second direction X and are each located below a second wall 13. The first battery module 1231 and the second battery module 1232 do not contact the first wall 12 in the second direction.

[0199] Example 2 The difference between Embodiment 2 and Embodiment 1 lies in the method of fixing the heat insulation structure 20 to the main body 10. In Embodiment 2, as... Figures 8 to 11 ,as well as Figures 15 to 18 As shown, the second housing 110b also includes a metal liner 40, an elastic sealing gasket 50, rivet nuts, bushings 60, and fasteners 30 (bolts). The metal liner 40 and the elastic sealing gasket 50 are disposed within the receiving cavity. The metal liner 40 is stacked on the side of the first wall 12 facing the first housing 110a, and the elastic sealing gasket 50 is stacked between the first wall 12 and the metal liner 40. There are 26 rivet nuts, bushings 60, and fasteners 30, with each fastener 30 corresponding to one rivet nut and one bushing 60. Among them, 12 fasteners 30 are first fasteners 30a, which are evenly distributed and spaced around the circumference of the first wall 12 to form a first array structure; the remaining 14 fasteners 30 are second fasteners 30b, which are evenly distributed and spaced around the circumference of the first wall 12 to form a second array structure, which is located outside the first array structure.

[0200] The second functional layer 22 has 12 through holes corresponding to 12 first fasteners 30a. The first functional layer 21 has 12 first through holes corresponding to 12 first fasteners 30a, and 14 second through holes 211 corresponding to 14 second fasteners 30b. The metal liner 40 has 26 first mounting holes corresponding to 26 fasteners 30, the elastic sealing gasket 50 has 26 second mounting holes corresponding to 26 fasteners 30, and the first wall 12 has 26 third mounting holes corresponding to 26 fasteners 30. Each first mounting hole houses a rivet nut. The second flange 312 of the rivet nut is located within a second mounting hole. Each bushing 60 extends into a second mounting hole via a third mounting hole and abuts against the second flange 312. The third flange 62 of the bushing 60 that mates with the first fastener 30a is located within a first through hole. The third flange 62 of the bushing 60 that mates with the second fastener 30b is located within a second through hole 211. From top to bottom, the first fastener 30a passes sequentially through the through hole, the first through hole, and the bushing 60 to extend into and mate with the rivet nut. The head 301 (bolt head) of the first fastener 30a is located on the side of the second functional layer 22 facing away from the first wall 12. From top to bottom, the second fastener 30b passes sequentially through the second through hole 211 and the bushing 60 to extend into and mate with the rivet nut. The head 301 of the second fastener 30b is located on the side of the second functional layer 22 facing the first wall 12.

[0201] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: First box; The second enclosure includes a main body and a heat insulation structure; the main body and the first enclosure overlap each other along a first direction to jointly enclose a receiving cavity; a groove is formed on the outer surface of the main body for accommodating a heat source; the heat insulation structure is located outside the receiving cavity and disposed in the groove, the heat insulation structure is used to separate the main body and the heat source, the heat insulation structure includes a first functional layer and a second functional layer disposed sequentially away from the first enclosure along the first direction, one of the first functional layer and the second functional layer is used to reflect the heat from the heat source, and the other is used to suppress the heat from the heat source from being transferred to the main body.

2. The battery device according to claim 1, characterized in that, The main body of the box includes a first wall and a second wall arranged sequentially away from the first box body along the first direction, and a connecting wall connecting the first wall and the second wall; the first wall is connected to the second wall on at least one side along the second direction, and the first wall and the connecting wall together define the groove; the heat insulation structure is at least covered on the first wall; wherein the second direction intersects the first direction.

3. The battery device according to claim 2, characterized in that, The battery device also includes: Multiple battery cells are housed in the receiving cavity and arranged to form at least two battery packs stacked along the first direction, wherein a portion of the at least two battery packs is formed as a first battery pack and the remaining portion is formed as a second battery pack; Each of the first battery packs is arranged on the side of the first wall opposite to the second wall; each of the second battery packs is at least partially housed within the housing body, and the second battery packs are arranged on at least one side of the recess in the second direction.

4. The battery device according to claim 3, characterized in that, The first wall is connected to the second wall on both sides along the second direction. The second battery pack includes a first battery module and a second battery module. The first battery module and the second battery module correspond to the two second walls respectively and are located on the side of the corresponding second wall facing the first housing. Along the second direction, the first battery module and the second battery module are located on both sides of the groove.

5. The battery device according to claim 3, characterized in that, The first battery pack, which is closest to the second battery pack, and the first wall have a first gap in the first direction.

6. The battery device according to claim 3, characterized in that, The end of the connecting wall that connects to the first wall is the first end, and the end of the connecting wall that connects to the second wall is the second end; in the second direction, the first end is closer to the first wall than the second end; Using a plane perpendicular to the first direction as the projection plane and the first direction as the projection direction, the projection of the second battery pack does not coincide with the projections of the first wall and the connecting wall.

7. The battery device according to claim 6, characterized in that, The connecting wall includes a first connecting wall, a second connecting wall, and a third connecting wall, which are connected in sequence by turning.

8. The battery device according to claim 2, characterized in that, The heat insulation structure is applied to the first wall; or, the heat insulation structure is applied to the first wall and at least a portion of the connecting wall; or, the heat insulation structure is applied to the first wall, the connecting wall, and at least a portion of the second wall.

9. The battery device according to any one of claims 1 to 8, characterized in that, The first functional layer and the second functional layer are adapted to conform to the groove.

10. The battery device according to any one of claims 1 to 8, characterized in that, The second enclosure also includes a first flange disposed around the outer periphery of the enclosure body and connected to the enclosure body; The groove extends through the main body of the box along a third direction, and the two ends of the second functional layer along the third direction are respectively fastened to the first flange and the first box body by locking members; wherein, the third direction intersects with the first direction.

11. The battery device according to any one of claims 1 to 8, characterized in that, The battery device also includes fasteners, at least a portion of which are first fasteners, and the heat insulation structure is fastened to the housing body via the first fasteners.

12. The battery device according to claim 11, characterized in that, The main body of the box includes a first wall that forms the groove and is close to the heat source. The surface of the first wall facing away from the first box body faces the heat source. The fastener extends from the side of the first wall facing away from the first box body along the first direction into the receiving cavity. The heat insulation structure is fastened to the first wall by the first fastener.

13. The battery device according to claim 12, characterized in that, The first fastener is provided with multiple fasteners arranged side by side to form at least one first array structure, and the multiple first fasteners included in the first array structure are arranged at intervals along the circumference of the first wall.

14. The battery device according to claim 12, characterized in that, The second housing also includes a metal liner and a rivet nut disposed within the receiving cavity. The metal liner has a first mounting hole that extends through the metal liner along the first direction. The rivet nut is fitted into the first mounting hole and is connected to the fastener.

15. The battery device according to claim 14, characterized in that, The second housing also includes an elastic sealing gasket disposed between the first wall and the metal liner, the elastic sealing gasket having a second mounting hole through which the fastener passes.

16. The battery device according to claim 15, characterized in that, The second housing also includes a bushing. The first wall is provided with a third mounting hole that communicates with the second mounting hole. The bushing is installed in the second mounting hole and the third mounting hole. One end of the bushing facing the first housing abuts against the rivet nut. The fastener passes through the bushing.

17. The battery device according to claim 12, characterized in that, At least a portion of the fasteners are second fasteners arranged to form at least one second array structure, wherein a plurality of second fasteners included in the second array structure are sequentially spaced along the circumference of the first wall. The head of each second fastener is located on the side of the second functional layer facing the first housing; Furthermore, all of the first fasteners are located inside the second array structure.

18. An electrical appliance, characterized in that, The electrical equipment includes a battery device as claimed in any one of claims 1 to 17, the battery device being used to provide electrical energy.

19. The electrical equipment according to claim 18, characterized in that, The electrical equipment is a hybrid power equipment, which includes an exhaust system, and the exhaust system is the heat source.

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