Battery device and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device and a power utilization device. The battery device comprises a box body, an inner container, single batteries and a high-voltage electrical module, the inner container is an insulating part, the inner container is arranged in the box body and comprises a main body structure and expansion beams, the main body structure is independent or matched with the inner wall of the box body to define a mounting cavity, and the mounting cavity is divided into a first cavity body and a second cavity body by at least one expansion beam; the battery monomers are arranged in the first cavity, and at least part of the high-voltage electrical module is arranged in the second cavity; wherein at least one of the expansion beam and the main body structure is internally provided with a cavity. According to the battery device and the power utilization device provided by the invention, the reliability of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device. BACKGROUND

[0002] The battery box body is generally made of metal material, and the box body usually contains high-voltage parts (such as battery monomers, bellows, etc.). If the insulation treatment between these parts and the metal box body is improper, it is easy to cause electric leakage or short circuit, which seriously threatens the reliability of the battery system. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the application provides a battery device and a power utilization device, aiming to improve the reliability of the battery device.

[0004] In a first aspect, an embodiment of the application provides a battery device, comprising a box body, an inner container, a battery monomer and a high-voltage electrical module. The inner container is an insulating part, and the inner container is arranged in the box body. The inner container comprises a main body structure and an expansion beam. The main body structure alone or in cooperation with the inner wall of the box body encloses an installation cavity. At least one expansion beam separates the installation cavity into a first cavity and a second cavity. The battery monomer is arranged in the first cavity, and at least part of the high-voltage electrical module is arranged in the second cavity. At least one of the expansion beam and the main body structure is provided with a cavity.

[0005] The battery device provided by the embodiment of the application has the inner container arranged in the box body. The inner container is an insulating part, and the inner container comprises the main body structure and the expansion beam. At least one of the expansion beam and the main body structure is provided with a cavity. In this way, the risk of short circuit between the battery monomer and the metal-made box body can be reduced, the weight of the inner container and the amount of materials required for preparation can be reduced, the manufacturing cost can be reduced, and the battery device is convenient for popularization.

[0006] In some possible implementation manners, the expansion beam has a first wall and a cavity. The first wall is in contact with the battery monomer. The cavity is provided with a first reinforcing structure. The first reinforcing structure is connected with the first wall, and the first reinforcing structure separates the cavity into a plurality of first sub-cavities.

[0007] The cavity and the first reinforcing structure are arranged in the expansion beam, and the first reinforcing structure separates the cavity into the first sub-cavities. In this way, the structure and performance of the battery device can be stable, and the first reinforcing structure does not occupy the whole cavity, so that the weight of the inner container is low and the amount of materials used is small.

[0008] In some possible implementation manners, the main body structure has a support. The support is used for bearing the battery monomer and the high-voltage electrical module. The expansion beam is connected with the support. The support is provided with a cavity and a second reinforcing structure. The second reinforcing structure separates the cavity into a plurality of second sub-cavities.

[0009] The support is internally provided with a cavity and a second reinforcing structure, and the second reinforcing structure divides the cavity into a second sub-cavity, so that the structure and performance of the battery device are stable, and the second reinforcing structure does not occupy the whole cavity, so that the weight of the inner container is low and the material is less.

[0010] In some possible implementation manners, at least one of the main body structure and the expansion beam is a target component; the inner container further comprises a fixing structure, the fixing structure is located in the second cavity, and the fixing structure is connected with the target component, and the high-voltage electrical module is connected with the target component through the fixing structure.

[0011] The fixing structure is arranged to facilitate the fixation of each module or element in the high-voltage electrical module. Since the fixing structure is part of the inner container, at least the outer wall of the fixing structure is made of insulating material, which can reduce the risk of electrical contact between each module or element in the high-voltage electrical module and the metal-made box.

[0012] In some possible implementation manners, the fixing structure comprises a convex part and a first fastener; the convex part is connected with the target component, a plurality of convex parts are arranged at intervals, and the first fastener is embedded in the convex part; the high-voltage electrical module is fixed in the convex part through the cooperation of the second fastener and the first fastener.

[0013] In the embodiment, the convex part can be made of insulating material, and the first fastener can be made of metal material, so that the risk of electrical contact between each module or element in the high-voltage electrical module and the metal-made box can be reduced, and the mechanical strength of the part (i.e. the first fastener) connected with the second fastener in the fixing structure is large and is not easy to be damaged.

[0014] In some possible implementation manners, the convex part is provided with a first mounting hole, the first fastener comprises a nut, the nut is arranged in the first mounting hole, and the second fastener is inserted into the first mounting hole and is threadedly connected with the nut.

[0015] The first fastener adopts a nut, which is convenient for pre-embedding in the convex part, and in this way, the second fastener can be a bolt, a screw, a screw rod or the like, the second fastener is arranged outside the first mounting hole, which is convenient for mounting on the high-voltage electrical module and fixing the high-voltage electrical module on the convex part.

[0016] In some possible implementations, the expansion beam has a first wall and a fourth wall arranged opposite to each other along a first direction, and the first wall contacts the battery cell; the multiple protrusions include a first protrusion, a second protrusion and a third protrusion arranged at intervals along the first direction; the first protrusion is arranged on the fourth wall, and the second protrusion and the third protrusion are arranged on the support; the high-voltage electrical module includes a battery management system, a high-voltage control box and a relay; the high-voltage control box and the relay are respectively connected to the second protrusion; the battery management system is connected to both the first protrusion and the third protrusion, and the battery management system is arranged on the side of the high-voltage control box and the relay away from the support.

[0017] In this embodiment, the battery management system, the high-voltage control box, and the relay are fixed by means of the first protrusion, the second protrusion, and the third protrusion, and the battery management system can be arranged above the high-voltage control box and the relay. In this way, the projected area of ​​the combined structure of the battery management system, the high-voltage control box, and the relay on the main structure along the height direction of the box can be smaller, the size of the support can be smaller, and it is helpful to realize the miniaturization design of the battery device.

[0018] In some possible implementations, the first protrusion includes a strip portion and a fixed portion. The strip portion is arranged on the fourth wall and is arranged along the length direction of the expansion beam. The fixed portion is arranged on the side of the strip portion facing away from the fourth wall, and the battery management system is connected to the fixed portion.

[0019] The first protrusion adopts the solution provided in this embodiment, so that there is a certain distance between the battery management system and the fourth wall, which facilitates the installation and disassembly of the second fastener, and facilitates the provision of multiple fixing parts according to usage needs, thereby increasing the number of connection points between the battery management system and improving the connection stability of the battery management system.

[0020] In some possible implementations, the strip portion is a hollow structure.

[0021] The strip portion is a hollow structure, which means that a cavity is provided inside the strip portion, so that the strip portion has less material and is lighter, thereby reducing manufacturing costs.

[0022] In some possible implementations, two expansion beams are provided, and the two expansion beams are spaced apart along the first direction; the main structure also includes a side wall connected to the support member, and two side walls are provided, and the two side walls and the two expansion beams are connected to form a frame; the support member has a first part and a second part arranged in sequence along the first direction, the first part and the frame form a first cavity, and the second part and the inner wall of the box form a second cavity.

[0023] By adopting the solution provided in this embodiment, there are side walls of the main structure between the battery cells and the side walls of the box, which can reduce the risk of contact between the battery cells and the box. Compared with the side walls of the main structure extending to the second cavity, less material is required for the main structure and the preparation cost is lower.

[0024] In some possible implementations, the battery device further includes a fixing member for fixing the battery cell, the fixing member is connected to the expansion beam via a third fastener, and a second mounting hole adapted for the third fastener is provided on a side of the expansion beam facing away from the bottom surface of the main structure.

[0025] The provision of the fixing member secures the battery cell, reducing the risk of damage to the battery cell due to shaking or unstable electrical connections during use, helping to improve the stability of the battery device's performance. The provision of the third fastener and the second mounting hole facilitates the connection of the fixing member to the expansion beam, helping to improve the assembly efficiency of the battery device.

[0026] In some possible implementations, the main structure and the expansion beam form a combined structure, and the battery device further includes a liquid cooling system, at least part of which is disposed within the combined structure.

[0027] The setting of the liquid cooling system enables the battery device to regulate the temperature of the battery cells with the help of coolant, so that the temperature of the battery cells is maintained within a preset temperature range, thereby reducing the risk of damage to the battery cells and helping to stabilize the performance of the battery device.

[0028] In some possible implementations, the combined structure is provided with a groove, and at least a portion of the liquid cooling system is provided in the groove.

[0029] The groove setting facilitates the installation of the liquid cooling system to a preset position, and can limit the relative position of the liquid cooling system and the combined structure, battery cells, etc., so that the cooling effect of the liquid cooling system can be more consistent with the pre-designed cooling effect.

[0030] In some possible implementations, the groove is provided on a side of the combined structure facing away from the battery cell.

[0031] This prevents the battery cells from being placed directly above the liquid cooling system, reducing the risk of the liquid cooling system being bent or crushed by the battery cells.

[0032] In some possible implementations, the main structure is provided with a first communication structure connecting the groove and the first cavity, and at least a portion of the liquid cooling system is in thermal conduction contact with the battery cell through the first communication structure.

[0033] Since at least part of the inner tank is made of insulating material, and the thermal conductivity of insulating material is generally poor, the provision of the first connecting structure can enable heat conduction between at least part of the liquid cooling system and the battery cell directly or through gas, which helps to improve the heat conduction efficiency between the liquid cooling system and the battery cell.

[0034] In some possible implementations, the liquid cooling system is bonded to the battery cells.

[0035] Thus, based on the previous embodiment, the relative position between the liquid cooling system and the battery cells can be further limited so that the heat of the battery cells can be directly transferred to the liquid cooling system, resulting in a better cooling effect on the battery cells.

[0036] In some possible implementations, the main structure is provided with a second connecting structure connecting the groove and the second cavity, and the liquid cooling system has inlet and outlet water pipes, which extend into the second cavity through the second connecting structure.

[0037] The second connecting structure is provided to facilitate the liquid cooling system to be connected to the external liquid supply pipeline through the inlet and outlet water pipes.

[0038] In some possible implementations, the liner is an integrally formed part.

[0039] This can make the inner liner structure stable, reduce the number of parts, and facilitate the preparation, assembly and sealing of the battery device.

[0040] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device provided by any of the above solutions.

[0041] The effect of the second aspect is the same as that of the first aspect and will not be described in detail here.

[0042] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0044] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0045] Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0046] Figure 3 A schematic diagram of a three-dimensional structure of a partial structure of a battery device provided in some embodiments of the present application;

[0047] Figure 4 for Figure 3 a schematic diagram of the exploded structure of the structure shown;

[0048] Figure 5 for Figure 4 Schematic diagram of the local enlarged structure at A in the middle;

[0049] Figure 6 for Figure 4 Schematic diagram of the local enlarged structure at B in the middle;

[0050] Figure 7 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0051] Figure 8 For the Figure 7 Schematic diagram of the partial cross-section structure of the CC line;

[0052] Figure 9 A schematic diagram of a partial structure of an inner liner in a battery device provided in some embodiments of the present application;

[0053] Figure 10 For the Figure 7 Schematic diagram of the partial cross-sectional structure of the DD line.

[0054] The accompanying drawings in the specific implementation manner are as follows:

[0055] 1000, vehicle;

[0056] 100, battery device; 200, controller; 300, motor;

[0057] 10. Box; 11. Cover; 12. Tray; 20. Battery cell; 30. Inner liner; 31. Main structure; 31a. Second sub-chamber; 32. Expansion beam; 32a. First sub-chamber; 33. Fixing structure; 40. High-voltage electrical module; 41. Battery management system; 42. High-voltage control box; 43. Relay; 50. Second fastener; 60. Fixing member; 70. Third fastener; 80. Liquid cooling system; 81. Liquid cooling pipe; 82. Current collector; 83. Water inlet and outlet pipes; 90. Groove;

[0058] 311, support member; 311a, first portion; 311b, second portion; 312, second reinforcement structure; 313, side wall; 314, first communication structure; 315, second communication structure; 321, first wall; 322, first reinforcement structure; 323, fourth wall; 324, second mounting hole; 331, protrusion; 331a, first protrusion; 331a1, strip portion; 331a2, fixing portion; 331b, second protrusion; 331c, third protrusion; 332, first fastener; 333, first mounting hole;

[0059] X, first direction. DETAILED DESCRIPTION

[0060] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0062] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0063] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0065] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0066] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0067] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0068] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0069] With the rapid development of the electric vehicle industry, battery technology, as one of its core driving forces, has received widespread attention. As a crucial component of a battery device, the design of the battery case directly impacts its performance, reliability, and manufacturing cost.

[0070] Battery cases are generally made of metal materials and usually contain high-voltage components (such as battery cells, bars, etc.). If the insulation between these components and the metal case is not properly handled, leakage or short circuits can easily occur, seriously threatening the reliability of the battery system.

[0071] To address the aforementioned issues, embodiments of the present application provide a battery device. This battery device includes an inner liner within a housing. The inner liner is an insulating component and includes a main structure and an expansion beam. At least one of the expansion beam and the main structure has a cavity. This reduces the risk of short circuits between the battery cells and the metal housing, while also reducing the weight of the inner liner and the amount of material required for its manufacture, thereby lowering production costs and facilitating widespread adoption.

[0072] The battery device disclosed by the embodiments of the present application can be used in a power consumption device using the battery device as a power supply, or various energy storage devices, energy storage systems and charging networks using the battery as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0073] The following embodiments are described by taking a power consumption device of an embodiment of the present application as a vehicle 1000 for convenience of description.

[0074] Please refer to Figure 1 , Figure 1 The vehicle 1000 provided by some embodiments of the present application is a structural schematic diagram. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended range car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further 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 demand of the vehicle 1000 during starting, navigation and driving.

[0075] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0076] Please refer to Figure 2 , Figure 2 The battery device 100 provided by some embodiments of the present application is an exploded structural schematic diagram. The battery device 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10.

[0077] The housing 10 is used to provide storage space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 may include a cover 11 and a tray 12. The cover 11 covers the tray and, together with the tray 12, defines a storage space for the battery cells 20. The tray 12 may be a hollow structure with one end open, and the cover 11 may be a plate-like structure. The cover 11 covers the open side of the tray 12, so that the cover 11 and tray 12 together define a storage space. Alternatively, both the cover 11 and tray 12 may be hollow structures with side openings, with the open side of the cover 11 covering the open side of the tray 12. Of course, the housing 10 formed by the cover 11 and tray 12 can have various shapes, such as a circular through-hole or a rectangular parallelepiped. The tray 12 is a critical structural component in the battery system, used to store and protect the battery cells. It also significantly impacts the collision safety of the vehicle and the torsional and bending stiffness of the vehicle body.

[0078] Multiple battery cells 20 may be provided, connected in series, parallel, or in a hybrid configuration via a busbar assembly. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 20. Multiple battery cells 20 may be directly connected in series, parallel, or in a hybrid configuration, and the entire assembly of multiple battery cells 20 may then be housed within the housing 10. Alternatively, the battery assembly 100 may comprise a battery module comprising multiple battery cells 20 connected in series, parallel, or in a hybrid configuration, and then the modules are further connected in series, parallel, or in a hybrid configuration to form a single assembly and housed within the housing 10. The battery assembly 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20. For example, the multiple battery cells 20 may form a battery module, which is composed of multiple battery cells 20 arranged and fixed together to form a single module. For example, a battery module may be formed by bundling multiple battery cells 20 using cable ties.

[0079] A battery cell 20 is the smallest unit that makes up a battery. Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery is a battery cell that can be recharged to activate the active material after discharge, allowing continued use. The battery cell 20 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, or the like, although this embodiment of the present application does not limit this. The battery cell can have a round through-hole, a flat body, a rectangular parallelepiped, or other shapes.

[0080] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of a three-dimensional structure of a partial structure of a battery device provided in some embodiments of the present application. Figure 4 for Figure 3 The schematic diagram of the exploded structure of the structure shown in the figure shows a battery device provided in an embodiment of the present application. The battery device includes a case 10, an inner liner 30, a battery cell 20 and a high-voltage electrical module 40. The inner liner 30 is an insulating member. The inner liner 30 is arranged in the case 10. The inner liner 30 includes a main structure 31 and an expansion beam 32. The main structure 31 forms an installation cavity alone or in conjunction with the inner wall of the case 10. At least one expansion beam 32 separates the installation cavity into a first cavity and a second cavity. The battery cell 20 is arranged in the first cavity, and at least part of the high-voltage electrical module 40 is arranged in the second cavity. Among them, at least one of the expansion beam 32 and the main structure 31 has a cavity therein.

[0081] The high-voltage electrical module 40 includes, but is not limited to, a battery management system 41, a high-voltage control box 42, and a relay 43. The battery management system 41 monitors the status of the battery cells 20; the high-voltage control box 42 is electrically connected to the battery management system 41; and the relay 43 is located in the output circuit of the high-voltage control box 42.

[0082] The inner liner 30 is an insulating part, which means that the inner liner 30 can be made entirely of an insulating material (such as plastic, composite material, etc.) or at least partially of an insulating material. As long as the outer surface of the inner liner 30 is insulating, the battery cell 20 will not be electrically connected to the metal box 10 or other electrical components in the box 10 (such as the high-voltage electrical module 40) through the inner liner 30.

[0083] In this embodiment, the inner liner 30 may include only the main structure 31 and the expansion beam 32, or may also include other structures, such as a fixing structure 33 and a retaining structure, in addition to the main structure 31 and the expansion beam 32. The specific structure can be determined based on actual use. It should be understood that since the inner liner 30 is an insulating member, the exposed portions of the components within the inner liner 30 (such as the main structure 31 and the collision beam) are also made of insulating material.

[0084] The main structure 31 is the main component of the inner shell 30 and is used to support the battery cells 20 and the high-voltage electrical module 40. The shape and structure of the main structure 31 can be determined according to the installation requirements of the battery cells 20 and the high-voltage electrical module 40.

[0085] The expansion beams 32 (also known as anti-collision beams or buffer beams) contact the battery cells 20 to suppress expansion, provide support, protection, and position control for the battery cells 20. A battery device typically includes multiple expansion beams 32. In this embodiment, all expansion beams 32 in the battery device can be located on the main structure 31, or some can be located on the main structure 31 and others on the housing 10. The specific configuration can be determined based on actual use.

[0086] The expansion beam 32 in the inner liner 30 can be integrally formed with the main structure 31 , or can be separately provided and connected to the main structure 31 , and the specific configuration can be determined based on usage requirements.

[0087] The mounting cavity is a cavity structure for accommodating the battery cells 20 and the high-voltage electrical module 40. Since the main structure 31 in this embodiment can be arranged in a variety of ways, the mounting cavity in this embodiment can also be composed in a variety of forms. In this embodiment, the main structure 31 alone or in conjunction with the inner wall of the housing 10 forms the mounting cavity, including the following situations: First, the main structure 31 alone forms the mounting cavity; second, the main structure 31 and the inner wall of the housing 10 form the mounting cavity.

[0088] For example, the main structure 31 may have a support member 311 and a side wall 313, and the support member 311 and the side wall 313 form an installation cavity. In this case, the main structure 31 alone forms the installation cavity. The main structure 31 may also have only a support member 311, and the support member 311 and the side wall 313 of the box body 10 form an installation cavity. This is a form in which the main structure 31 cooperates with the inner wall of the box body 10 to form an installation cavity. In addition, the main structure 31 may also have a support member 311 and a side wall 313, and a part of the support member 311, the side wall 313 and the expansion beam 32 form a part of the installation cavity, and another part of the support member 311, the expansion beam 32 and the side wall 313 of the box body 10 form another part of the installation cavity. This is another form in which the main structure 31 cooperates with the inner wall of the box body 10 to form an installation cavity. The above-mentioned support member 311 may be a plate, a block, or other shapes or structures, which can be determined according to the specific needs of use.

[0089] The first cavity is a part of the installation cavity, and is used to accommodate at least the battery cell 20. The second cavity is also a part of the installation cavity, and is used to accommodate at least a part of the structure of the high-voltage electrical module 40.

[0090] It should be noted that at least a portion of the high-voltage electrical module 40 is disposed within the second cavity. This may be the case where the entire high-voltage electrical module 40 is disposed within the second cavity, or where a portion of the high-voltage electrical module 40 is disposed within the second cavity and the remaining portion is disposed outside the second cavity. The specific configuration can be determined based on actual use. For example, if the high-voltage electrical module 40 includes a flap, a portion of the flap may be disposed within the second cavity and the remaining portion may be disposed within the first cavity.

[0091] Since the dimension of the expansion beam 32 in the depth direction of the installation cavity is generally smaller than the dimension of the installation cavity in the depth direction, there is generally a spacing space between the expansion beam 32 and the upper cover of the box body 10. The first cavity and the second cavity are connected through the spacing space, which also facilitates the electrical connection between the high-voltage electrical module 40 and the battery cell 20.

[0092] The cavity is arranged in at least one of the expansion beam 32 and the main body structure 31, including the following schemes: a first scheme, the cavity is arranged in the expansion beam 32; a second scheme, the cavity is arranged in the main body structure 31; and a third scheme, the cavity is arranged in the expansion beam 32, and the cavity is arranged in the main body structure 31.

[0093] The arrangement of the cavity can reduce the weight of the inner container 30 and the amount of material required for preparation, help to reduce the manufacturing cost, and facilitate popularization.

[0094] The battery device provided in the embodiment of the application is provided with the inner container 30 in the box body 10, the inner container 30 is an insulating part, the inner container 30 includes the main body structure 31 and the expansion beam 32, and the cavity is arranged in at least one of the expansion beam 32 and the main body structure 31, so that the risk of short circuit between the battery monomer 20 and the box body 10 made of metal can be reduced, the weight of the inner container 30 and the amount of material required for preparation can be reduced, the manufacturing cost can be reduced, and popularization can be facilitated.

[0095] Figure 5 For Figure 4 The local enlarged structure schematic view at A in FIG. 4 is shown in FIG. 5. Figure 5 As shown in FIG. 5, in some embodiments, the expansion beam 32 has a first wall 321 and a cavity. The first wall 321 is in contact with the battery monomer. The cavity is provided with a first reinforcing structure 322. The first reinforcing structure 322 is connected with the first wall 321, and the first reinforcing structure 322 divides the cavity into a plurality of first sub-cavities 32a.

[0096] The first wall 321 is a side wall of the expansion beam 32 for contact with the battery monomer.

[0097] The first reinforcing structure 322 is a structure for enhancing the mechanical strength of the expansion beam 32, which can be a reinforcing plate, a reinforcing rib, etc., and can be determined according to the use requirement.

[0098] The first reinforcing structure 322 can be integrally connected with the first wall 321, or can be connected with the first wall 321 through insertion, clamping, etc., and can be determined according to the use requirement.

[0099] Since the first wall 321 is in contact with the battery monomer, when the battery monomer expands, the first wall 321 will receive the expansion force and exert a counterforce on the battery monomer to inhibit the expansion of the battery monomer. The first reinforcing structure 322 is connected with the first wall 321, which can increase the upper limit of the expansion force that the first wall 321 can withstand, so that the first wall 321 can withstand a larger expansion force and can exert a larger counterforce on the battery monomer to inhibit the expansion of the battery monomer, so that the structure and performance of the battery device are stable.

[0100] The expansion beam 32 is provided with a cavity and a first reinforcement structure 322, and the first reinforcement structure 322 divides the cavity into a first sub-cavity 32a, which can not only stabilize the structure and performance of the battery device, but also ensure that the first reinforcement structure 322 does not occupy the entire cavity, so that the weight of the inner liner 30 is lower and less material is used.

[0101] Figure 6 for Figure 4 The schematic diagram of the local enlarged structure at B in the figure. Figure 4 and Figure 6 As shown, in some embodiments, the main structure 31 has a support member 311. The support member 311 is used to support the battery cell 20 and the high-voltage electrical module 40. The expansion beam 32 is connected to the support member 311. The support member 311 has a cavity and a second reinforcement structure 312 therein. The second reinforcement structure 312 divides the cavity into a plurality of second sub-cavities 31a.

[0102] The support member 311 is a structure in the main structure 31 used to support the battery cell 20 and the high-voltage electrical module 40. It is generally the bottom plate of the main structure 31, and can also be the bottom plate in the main structure 31 and other structures connected to the bottom plate. The specific structure can be determined according to usage requirements.

[0103] The second reinforcement structure 312 is a structure used to enhance the mechanical strength of the support member 311 , and may be a reinforcement plate, reinforcement ribs, etc., and may be specifically determined according to usage requirements.

[0104] The second reinforcement structure 312 can be connected to the support member 311 in an integral manner, or can be connected to the support member 311 by plugging, snapping, etc., depending on the specific usage requirements.

[0105] The support member 311 is a key component of the main structure 31. The support member 311 is provided with a cavity, which reduces the material used in the main structure 31, resulting in lower weight and manufacturing costs. Because the support member 311 is used to support the battery cells 20 and the high-voltage electrical module 40, the pressure on the support member 311 is primarily the weight of the battery cells 20 and the high-voltage electrical module 40 along the height of the housing 10. The second reinforcement structure 312 is connected to the support member 311 to increase the upper limit of the pressure that the support member 311 can withstand, allowing a larger number of battery cells 20 and high-voltage electrical modules 40 to be placed on the support member 311, meeting the needs of different usage environments and ensuring stable structure and performance of the battery device.

[0106] The support member 311 is provided with a cavity and a second reinforcement structure 312, and the second reinforcement structure 312 divides the cavity into a second sub-cavity 31a, which can not only stabilize the structure and performance of the battery device, but also ensure that the second reinforcement structure 312 does not occupy the entire cavity, so that the weight of the inner liner 30 is lower and less material is used.

[0107] like Figure 4 As shown, in some embodiments, at least one of the main structure 31 and the expansion beam 32 is a target component. The liner 30 also includes a fixing structure 33. The fixing structure 33 is located within the second cavity and is connected to the target component. The high-voltage electrical module 40 is connected to the target component via the fixing structure 33.

[0108] At least one of the main structure 31 and the expansion beam 32 is the target component, including the following situations: first, the main structure 31 is the target component; second, the expansion beam 32 is the target component; third, both the main structure 31 and the expansion beam 32 are target components.

[0109] The fixing structure 33 is a structure used to fix the modules or components in the high-voltage electrical module 40 , and can be a convex column, a bump, etc., and the specific structure can be determined according to the use requirements.

[0110] Since there are multiple possibilities for target components, the fixed structure 33 is connected to the target component, which means that when the main structure 31 is the target component, the fixed structure 33 is connected to the main structure 31; when the expansion beam 32 is the target component, the fixed structure 33 is connected to the expansion beam 32; when both the main structure 31 and the expansion beam 32 are target components, a part of the fixed structure 33 is connected to the main structure 31, and the other part is connected to the expansion beam 32.

[0111] There can be one or more fixing structures 33 , and the specific number can be determined according to usage requirements.

[0112] The provision of the fixing structure 33 facilitates the fixing of the modules or components in the high-voltage electrical module 40. Because the fixing structure 33 is part of the inner shell 30, at least the outer wall of the fixing structure 33 is made of insulating material, which can reduce the risk of electrical contact between the modules or components in the high-voltage electrical module 40 and the metal box 10.

[0113] Figure 7 This is a schematic diagram of the main structure of a partial structure of a battery device provided in some embodiments of the present application. Figure 8 For the Figure 7 Schematic diagram of the partial cross-section structure of the CC line. Figure 4 、 Figure 7 and Figure 8 As shown, in some embodiments, the fixing structure 33 includes a protrusion 331 and a first fastener 332. The protrusion 331 is connected to the target component. Multiple protrusions 331 are provided, and the multiple protrusions 331 are spaced apart. The first fastener 332 is embedded in the protrusion 331. The high-voltage electrical module 40 is fixed to the protrusion 331 through the cooperation of the second fastener 50 and the first fastener 332.

[0114] The protrusion 331 is a structure protruding from the target component, such as a bump, a ridge, etc., and can be specifically determined according to the installation requirements of the high-voltage electrical module 40.

[0115] The first fastener 332 and the second fastener 50 are mechanical parts that fasten two components together to form a whole. The first fastener 332 and the second fastener 50 can achieve a fixed connection between the high-voltage electrical module 40 and the protrusion 331.

[0116] In this embodiment, the first fastener 332 and the second fastener 50 can be two parts connected by threads. If the first fastener 332 is a nut, the second fastener 50 can be a screw, a bolt, etc. If the first fastener 332 is a screw, a bolt, etc., the second fastener 50 can be a nut.

[0117] In this embodiment, the protrusion 331 can be made of insulating material, and the first fastener 332 can be made of metal material. This can not only reduce the risk of electrical contact between the modules or components in the high-voltage electrical module 40 and the metal box 10, but also make the part of the fixed structure 33 connected to the second fastener 50 (i.e., the first fastener 332) have greater mechanical strength and is not easily damaged.

[0118] like Figure 4 and Figure 8 As shown, in some embodiments, the protrusion 331 is provided with a first mounting hole 333. The first fastener 332 includes a nut. The nut is disposed in the first mounting hole 333. The second fastener 50 is inserted into the first mounting hole 333 and threadedly connected to the nut.

[0119] The first fastener 332 is a nut, which is convenient for pre-embedding in the protrusion 331, and this allows the second fastener 50 to be a bolt, screw, or threaded rod. The second fastener 50 is arranged outside the first mounting hole 333, which is convenient for installation on the high-voltage electrical module 40 and drives the high-voltage electrical module 40 to be fixed on the protrusion 331.

[0120] In some embodiments, the first fastener 332 and the second fastener 50 are both metal pieces.

[0121] In this way, the mechanical strength of the first fastener 332 and the second fastener 50 is greater, and they are not easily damaged, which helps to fix the high-voltage electrical module 40.

[0122] like Figure 4 and Figure 5 As shown, in some embodiments, the expansion beam 32 has a first wall 321 and a fourth wall 323 disposed opposite to each other along the first direction X. The first wall 321 contacts the battery cell.

[0123] The multiple protrusions 331 include a first protrusion 331a, a second protrusion 331b, and a third protrusion 331c, spaced apart along the first direction X. The first protrusion 331a is located on the fourth wall 323, while the second and third protrusions 331b, 331c, are located on the support member 311. The high-voltage electrical module 40 includes a battery management system 41, a high-voltage control box 42, and a relay 43. The high-voltage control box 42 and the relay 43 are respectively connected to the second protrusion 331b. The battery management system 41 is connected to both the first and third protrusions 331a, 331c, and is located on the side of the high-voltage control box 42 and the relay 43 facing away from the support member 311.

[0124] The first direction X is the thickness direction of the expansion beam 32 , and the fourth wall 323 and the first wall 321 are disposed opposite to each other in the thickness direction of the expansion beam 32 .

[0125] The first convex portion 331a, the second convex portion 331b and the third convex portion 331c may be provided with one or more, respectively. The structures and shapes of the three convex portions may be the same or different, depending on the specific needs of use.

[0126] The battery management system 41 monitors the status of the battery cells 20. The high-voltage control box 42 distributes, protects, and monitors the power of the battery cells 20. The high-voltage control box 42 is electrically connected to the battery management system 41. A relay 43 is located in the output circuit of the high-voltage control box 42.

[0127] The battery management system 41 is disposed on a side of the high-voltage control box 42 and the relay 43 that is away from the support member 311 , that is, the battery management system 41 is disposed above the high-voltage control box 42 and the relay 43 .

[0128] In this embodiment, the battery management system 41, the high-voltage control box 42, and the relay 43 are fixed by means of the first protrusion 331a, the second protrusion 331b, and the third protrusion 331c, and the battery management system 41 can be arranged above the high-voltage control box 42 and the relay 43. In this way, the projected area of ​​the combined structure of the battery management system 41, the high-voltage control box 42, and the relay 43 along the height direction of the box body 10 on the main structure 31 can be smaller, and the size of the support member 311 can be smaller, which helps to achieve a miniaturized design of the battery device.

[0129] Figure 9 This is a schematic diagram of the partial structure of the inner container in the battery device provided in some embodiments of the present application. Figure 9As shown, in some embodiments, the first protrusion 331a includes a strip portion 331a1 and a fixing portion 331a2. The strip portion 331a1 is provided on the fourth wall 323 and is arranged along the length direction Y of the expansion beam. The fixing portion 331a2 is provided on a side of the strip portion 331a1 facing away from the fourth wall 323. The battery management system 41 is connected to the fixing portion 331a2.

[0130] The first protrusion 331a may include only the strip portion 331a1 and the fixing portion 331a2, or may include other structures in addition to the strip portion 331a1 and the fixing portion 331a2, and the specific structure may be determined according to usage requirements.

[0131] The strip portion 331a1 is a structure whose length dimension is significantly greater than its dimensions in other dimensions. "Significantly greater" means at least twice the length in other dimensions. The strip portion 331a1 can be integrally formed with the fourth wall 323 or separately connected to the fourth wall 323, depending on the intended use.

[0132] The strip portion 331 a 1 is provided along the length direction Y of the expansion beam, which means that the length direction of the strip portion 331 a 1 is the same direction as the length direction Y of the expansion beam, or the two are parallel.

[0133] The fixing portion 331a2 is a structure connected to the battery management system 41. One or more fixing portions 331a2 can be provided according to usage requirements.

[0134] The first protrusion 331a adopts the solution provided in this embodiment, so that there is a certain distance between the battery management system 41 and the fourth wall 323, which facilitates the installation and disassembly of the second fastener, and facilitates the provision of multiple fixing portions 331a2 according to usage needs, thereby increasing the number of connection points between the battery management system 41 and improving the connection stability of the battery management system 41.

[0135] In some possible implementations, the strip portion 331 a 1 is a hollow structure.

[0136] The strip portion 331a1 is a hollow structure, which means that a cavity is provided inside the strip portion 331a1, so that the strip portion 331a1 is made of less material and lighter, thereby reducing manufacturing costs.

[0137] like Figure 4As shown, in some embodiments, two expansion beams 32 are provided. The two expansion beams 32 are spaced apart along the first direction X. The main structure 31 also includes two sidewalls 313 connected to the support member 311. The two sidewalls 313 are provided. The two sidewalls 313 and the two expansion beams 32 are connected to form a frame. The support member 311 includes a first portion 311a and a second portion 311b arranged in sequence along the first direction X. The first portion 311a and the frame form a first cavity, and the second portion 311b and the inner wall of the box body 10 form a second cavity.

[0138] The side wall 313 may be a plate, a block, etc., and the specific shape may be determined according to usage requirements.

[0139] At least the surface of the side wall 313 in contact with the battery cell 20 is made of insulating material.

[0140] The two side walls 313 and the two expansion beams 32 are connected to form a frame, which means that the two expansion beams 32 are connected through the side walls 313. The two side walls 313 are connected through the expansion beams 32. The formed frame can be formed by connecting the two side walls 313 and the two expansion beams 32 end to end, or the part close to the end of the expansion beam 32 can be connected through the side walls 313.

[0141] In this embodiment, the support member 311 can be a single unitary structure or comprised of multiple components. The multiple components can be connected via an expansion beam 32 or directly connected, depending on the specific needs. Since the support member 311 can be arranged in a variety of ways, the support member 311 having the first portion 311a and the second portion 311b sequentially arranged along the first direction X can also be arranged in a variety of ways.

[0142] For example, if the support plate is an integral structure, the above-mentioned support member 311 has a first part 311a and a second part 311b arranged in sequence along the first direction X, which means that the first part 311a and the second part 311b are connected; if the support member 311 is composed of multiple parts, the above-mentioned support member 311 has a first part 311a and a second part 311b arranged in sequence along the first direction X, which means that the support member 311 has a first part 311a and a second part 311b arranged at intervals along the first direction X, and the first part 311a and the second part 311b are connected by the expansion beam 32.

[0143] By adopting the solution provided in this embodiment, the side wall 313 of the main structure 31 is provided between the battery cell 20 and the side wall 313 of the box body 10, which can reduce the contact risk between the battery cell 20 and the box body 10. Compared with the side wall 313 of the main structure 31 extending to the second cavity, less material is required for the main structure 31, and the preparation cost is lower.

[0144] like Figure 4 and Figure 5 As shown, in some embodiments, the battery device further includes a fixing member 60 for fixing the battery cell 20. The fixing member 60 is connected to the expansion beam 32 via a third fastener 70. The expansion beam 32 has a second mounting hole 324 adapted to fit the third fastener 70 on a surface facing away from the bottom surface of the main structure 31.

[0145] The fixing member 60 is used to cooperate with the supporting member 311 of the main structure 31 to clamp the battery cell 20. The fixing member 60 can be a steel belt, a pressure plate, etc., and the specific material can be determined according to the use requirements.

[0146] The third fastener 70 can be a bolt, a screw, a threaded rod, etc., and the specific method can be determined according to the use requirements.

[0147] Adaptation means that the second mounting hole 324 can be inserted into the third fastener 70 , and when the third fastener 70 has threads, the inner wall of the second mounting hole 324 is provided with threads adapted to the threads of the third fastener 70 so as to be threadedly connected to the third fastener 70 .

[0148] The provision of the fixing member 60 secures the battery cell 20, reducing the risk of damage to the battery cell 20 due to shaking or unstable electrical connections during use, thereby improving the stability of the battery device's performance. The provision of the third fastener 70 and the second mounting hole 324 facilitates the connection between the fixing member 60 and the expansion beam 32, thereby improving the assembly efficiency of the battery device.

[0149] like Figure 4 As shown, in some embodiments, the main structure 31 and the expansion beam 32 form a combined structure. The battery device also includes a liquid cooling system 80. At least a portion of the liquid cooling system 80 is disposed within the combined structure.

[0150] The liquid cooling system 80 is a system for the flow of cooling liquid, and can be composed of one or more pipes, collectors 82, etc.

[0151] At least part of the liquid cooling system 80 is arranged in the combined structure, which means that the entire liquid cooling system 80 can be arranged in the combined structure, or part of the liquid cooling system 80 can be arranged in the combined structure and the other part can be arranged outside the combined structure, which can be determined according to usage needs.

[0152] The setting of the liquid cooling system 80 allows the battery device to regulate the temperature of the battery cells 20 with the help of coolant, so that the temperature of the battery cells 20 remains within a preset temperature range, thereby reducing the risk of damage to the battery cells 20 and helping to stabilize the performance of the battery device.

[0153] Figure 10 For the Figure 7 Schematic diagram of the partial cross-section structure of the DD line. Figure 7 and Figure 10 As shown, in some embodiments, the combined structure is provided with a groove 90 . At least a portion of the liquid cooling system 80 is provided in the groove 90 .

[0154] The groove 90 is a groove body that accommodates at least part of the structure of the liquid cooling system 80. It can be arranged in the combined structure, or on the side of the combined structure facing the battery cell 20, or on the side of the combined structure away from the battery cell 20, depending on the specific usage requirements.

[0155] The provision of the groove 90 facilitates the installation of the liquid cooling system 80 to a preset position, and can limit the relative position of the liquid cooling system 80 and the combined structure, battery cell 20, etc., so that the cooling effect of the liquid cooling system 80 can be more consistent with the pre-designed cooling effect.

[0156] In some embodiments, the groove 90 is disposed on a side of the combined structure facing away from the battery cell 20 .

[0157] In this way, the battery cells 20 will not be placed directly above the liquid cooling system 80 , thereby reducing the risk of the liquid cooling system 80 being bent or broken by the battery cells 20 .

[0158] like Figure 10 As shown, in some embodiments, the main structure 31 is provided with a first communication structure 314 communicating with the groove 90 and the first cavity. At least a portion of the liquid cooling system 80 is in thermal contact with the battery cell 20 via the first communication structure 314 .

[0159] The first connecting structure 314 is a structure connecting the groove 90 and the first cavity, and can be a through hole, a through slot, etc., and can be a continuous structure or a plurality of split structures (such as a plurality of through holes) arranged at intervals, and the specific structure can be determined according to the use requirements.

[0160] At least a portion of the liquid cooling system 80 is in thermal conductive contact with the battery cell 20 via the first communication structure 314. This means that at least a portion of at least one surface of the liquid cooling system 80 facing the battery cell 20 is in thermal conductive contact with the battery cell 20. Thermal conductive contact refers to the physical process by which heat is transferred from a high-temperature object to a low-temperature object when the surfaces of two solid objects (the liquid cooling system 80 and the battery cell 20) are in direct or indirect contact.

[0161] At least part of the above-mentioned liquid cooling system 80 is in heat conduction contact with the battery cell 20 through the first connecting structure 314. At least part of the liquid cooling system 80 may pass through the first connecting structure 314 and directly contact the battery cell 20, or at least part of the liquid cooling system 80 may be able to achieve heat exchange with the battery cell 20 through the gas in the first connecting structure 314.

[0162] Since at least part of the inner liner 30 is made of insulating material, and the thermal conductivity of insulating material is generally poor, the setting of the first connecting structure 314 can enable heat conduction between at least part of the liquid cooling system 80 and the battery cell 20 directly or through gas, which helps to improve the heat conduction efficiency between the liquid cooling system 80 and the battery cell 20.

[0163] In some embodiments, the liquid cooling system 80 is bonded to the battery cell 20 .

[0164] The liquid cooling system 80 can be bonded to the battery cell 20 by adhesives such as structural adhesive and double-sided adhesive.

[0165] Thus, based on the previous embodiment, the relative position between the liquid cooling system 80 and the battery cells 20 can be further limited so that the heat of the battery cells 20 can be directly transferred to the liquid cooling system 80 , thereby achieving a better cooling effect on the battery cells 20 .

[0166] like Figure 4 As shown, in some embodiments, the main structure 31 is provided with a second connecting structure 315 connecting the groove 90 and the second cavity. The liquid cooling system 80 has an inlet and outlet water pipe 83. The inlet and outlet water pipe 83 extends into the second cavity through the second connecting structure 315.

[0167] The second connecting structure 315 connects the groove 90 with the second cavity. It can be a through hole, a through slot, or the like. It can be a continuous structure or a plurality of separate structures (e.g., multiple through holes) spaced apart at intervals. The specific configuration can be determined based on the actual use. The shape and configuration of the second connecting structure 315 can be determined based on the shape and configuration of the inlet and outlet pipes 83.

[0168] The water inlet and outlet pipes 83 include a water inlet pipe and a water outlet pipe. The water inlet pipe and the water outlet pipe are used to communicate with an external liquid supply pipeline, and the two pipes can be arranged at intervals or adjacent to each other.

[0169] It can be understood that when the water inlet pipe and the water outlet pipe are arranged at intervals, the second connecting structure 315 includes multiple through structures (such as through holes) arranged at intervals; when the water inlet pipe and the water outlet pipe are arranged adjacent to each other, the second connecting structure 315 can be formed by only one through structure (such as a long through hole).

[0170] The second connecting structure 315 is provided to facilitate the liquid cooling system 80 to be connected to the external liquid supply pipeline through the inlet and outlet water pipes 83 .

[0171] In some embodiments, the liner 30 is an integrally formed part.

[0172] The inner liner 30 is an integrally formed part, which means that the inner liner 30 can be formed into a complex structural part by using injection molding, molding and other processes to form the insulating material in one go, without the need for subsequent splicing or assembly.

[0173] In this way, the inner container 30 is stable in structure, and the number of components is small, facilitating preparation, assembly and sealing of the battery device.

[0174] According to some embodiments of the present application, the present application also provides a power utilization device comprising the battery device provided in any of the above aspects. The battery device is used to store or provide electric energy.

[0175] The power utilization device can be a device or system of any of the above applications.

[0176] The power utilization device provided by the embodiments of the present application comprises the above battery device and can achieve the same effects, which will not be described here.

[0177] As shown in Figures 3 to 10 An embodiment of the present application provides a battery device. The battery device comprises a box body 10, an inner container 30, a battery cell 20 and a high-voltage electrical module 40. The inner container 30 is arranged in the box body 10. The inner container 30 is a one-piece plastic part. The inner container 30 comprises a main body structure 31 and an expansion beam 32. The main body structure 31 comprises a support member 311 and a side wall 313. The expansion beam 32 and the side wall 313 are both provided with two, the two ends of the two expansion beams 32 are connected through the side wall 313 to form a frame. The length of the support member 311 is greater than the length of the frame, and a part of the support member 311 and the frame form a first cavity, and another part of the support member 311 protrudes out of the frame to form a second cavity with the inner wall of the box body 10. The side wall 313 also has a cavity. The battery cell 20 is arranged in the first cavity. At least part of the high-voltage electrical module 40 is arranged in the second cavity. The expansion beam 32 and the main body structure 31 both have cavities inside.

[0178] The expansion beam 32 has a first wall 321 in contact with the battery cell 20. The expansion beam 32 has a cavity and a first reinforcing structure 322 inside. The first reinforcing structure 322 is connected with the first wall 321, and the first reinforcing structure 322 divides the cavity into a plurality of first sub-cavities 32a.

[0179] The main body structure 31 has a cavity and a second reinforcing structure 312 inside at least the support member 311. The second reinforcing structure 312 is connected with the support member 311. The second reinforcing structure 312 divides the cavity into a plurality of second sub-cavities 31a. The side wall 313 can also have a cavity and a second reinforcing structure 312.

[0180] The battery device also includes a liquid cooling system 80. This system comprises a liquid cooling tube 81, a current collector 82, and an inlet and outlet pipe 83, which are interconnected in sequence. The main structure 31 and the expansion beam 32 form a combined structure, which is provided with a groove 90. This groove 90 is located on the side of the main structure 31 facing away from the battery cells 20. The liquid cooling tube 81 and the current collector 82 are located between the main structure 31 and the housing 10, with at least portions of the liquid cooling tube 81 and the current collector 82 located within the groove 90.

[0181] The main structure 31 is provided with a first connecting structure 314 connecting the groove 90 and the first cavity. At least a portion of the liquid cooling system 80 is in contact with the battery cell 20 through the first connecting structure 314.

[0182] The liquid cooling system 80 is bonded to the battery cell 20. The main structure 31 is provided with a second connecting structure 315 connecting the groove 90 and the second cavity. The water inlet and outlet pipes 83 extend into the second cavity through the second connecting structure 315.

[0183] The main structure 31 includes a support member 311, which is disposed within the second cavity and is used to support the high-voltage electrical module 40. The expansion beam 32 includes a first wall 321 and a fourth wall 323, disposed opposite each other along a first direction X. The inner container 30 also includes a fixing structure 33. This fixing structure 33 is located within the second cavity. The fixing structure 33 includes a protrusion 331 and a first fastener 332. Multiple protrusions 331 are provided, and the multiple protrusions 331 are spaced apart.

[0184] The multiple protrusions 331 include a first protrusion 331a, a second protrusion 331b, and a third protrusion 331c, spaced apart along the first direction X. The first protrusion 331a is located on the fourth wall 323, while the second and third protrusions 331b, 331c, are located on the support member 311. The high-voltage electrical module 40 includes a battery management system 41, a high-voltage control box 42, and a relay 43. The high-voltage control box 42 and the relay 43 are respectively connected to the second protrusion 331b. The battery management system 41 is connected to both the first and third protrusions 331a, 331c, and is located on the side of the high-voltage control box 42 and the relay 43 facing away from the support member 311.

[0185] The first protrusion 331a includes a strip-shaped portion connected to the fourth wall 323 and a fixing portion connected to the side of the strip-shaped portion facing away from the expansion beam. The strip-shaped portion is arranged along the length of the expansion beam and is hollow. Multiple fixing portions are provided, spaced apart along the length of the strip-shaped portion. The battery management system 41 is connected to the fixing portion.

[0186] The first fasteners 332 are embedded in the protrusions 331 . The high-voltage electrical module 40 is fastened to the first fasteners 332 via the second fasteners 50 .

[0187] Each protrusion 331 is provided with a first mounting hole 333. The first fastener 332 includes a nut. The nut is disposed in the first mounting hole 333. The second fastener 50 is inserted into the first mounting hole 333 and threadedly connected to the nut.

[0188] The first fastening member 332 and the second fastening member 50 are both metal members.

[0189] The battery device also includes a fixing member 60 for fixing the battery cell 20. The fixing member 60 is connected to the expansion beam 32 via a third fastener 70. The expansion beam 32 has a second mounting hole 324 on the side facing away from the bottom of the main structure 31, which is adapted to the third fastener 70. The fixing member 60 is a steel strip.

[0190] If the inner liner 30 in the battery case 10 is composed of multiple independent parts, such as the chemical chamber and high-pressure chamber (i.e., the first and second chambers) being designed independently, the inner liner 30 would have a wide variety of parts and complex assembly, increasing the manufacturing cost and difficulty of the inner liner 30. Furthermore, the complex component structure may also lead to unstable sealing performance of the battery device, further affecting the performance and reliability of the battery device. The inner liner 30 in the battery device provided in this embodiment adopts an integrally molded structure, integrating the inner liner 30 components of the chemical chamber and high-pressure chamber into a single, integrated structure. This reduces the number of parts, significantly simplifies the structures of the inner liner 30 and the case 10, and simplifies the assembly process, reducing manufacturing costs while improving the sealing performance of the case 10.

[0191] The liquid cooling system is typically installed as a separate module outside or inside the housing 10. This results in low heat dissipation efficiency for the battery device, making it difficult to meet the rapid heat dissipation requirements of high-power battery devices. Furthermore, the separate installation of the liquid cooling system takes up additional space and increases the overall weight of the housing 10.

[0192] The battery device provided in this embodiment integrates a liquid cooling system. The lower portion of the inner liner 30 is designed as a hollow structure for mounting the liquid cooling system 80. The liquid cooling system 80 includes a liquid cooling pipe 81, a current collector 82, and an inlet and outlet water pipe 83, which are connected in sequence to ensure efficient operation of the liquid cooling system 80. The liquid cooling system 80 is bonded to the battery cells 20 with structural adhesive to ensure good heat transfer performance. The integrated design of the liquid cooling system 80 not only improves heat dissipation efficiency, but also reduces additional space occupation and reduces the overall weight of the box 10.

[0193] The battery device provided in this embodiment utilizes a plastic liner to isolate the high-voltage components (such as the battery cells 20 and tabs) within the housing 10 from the metal housing, thus preventing the battery cells from directly contacting the metal housing, which could easily lead to leakage or short circuits. The specific design is as follows:

[0194] The plastic liner has good insulation performance and can effectively isolate the live parts from the metal box;

[0195] The inner tank 30 is designed with multiple fixing points and mounting posts (i.e., the aforementioned fixing structure) for fixing high-voltage components such as the high-voltage control box 42, the battery management system 41, and the relay 43, thereby improving the mechanical connection strength;

[0196] The metal nut embedded in the fixing structure further improves the connection reliability;

[0197] In order to improve the structural strength and anti-expansion capability of the box body 10, the embodiment of the present application incorporates a porous expansion beam structure into the design of the inner liner 30;

[0198] A steel belt mounting point (second mounting hole) is designed on the upper portion of the expansion beam 32 to fix the steel belt of the box body 10 (i.e., the aforementioned fixing member), thereby enhancing the impact resistance of the box body 10;

[0199] The lower part of the expansion beam 32 is designed as a hollow structure, which facilitates the installation of the liquid cooling system and improves the anti-expansion ability of the inner tank 30;

[0200] At the same time, the integrated design improves the sealing performance of the box 10 and reduces the risk of failure due to poor sealing.

[0201] The integrated liquid cooling system significantly improves the battery's heat dissipation efficiency, quickly dissipating heat generated by the battery cells, thereby increasing the battery's charge and discharge efficiency and service life. Furthermore, the efficient operation of the liquid cooling system reduces the risk of thermal runaway, further enhancing the reliability of the battery system.

[0202] The inner liner 30 has excellent insulation performance, can withstand high-voltage environments, effectively isolate high-voltage components from the metal box, and significantly improve the reliability of the battery system.

[0203] The design of the porous expansion beam structure and steel belt installation points significantly improves the structural strength and anti-expansion ability of the box 10, enhances the impact resistance of the box 10, and is suitable for various complex working conditions. The lower part is designed with a hollow structure and an embedded liquid cooling system.

[0204] The bottom of the liquid cooling tube is installed in the groove 90 of the inner liner 30. After the front of the inner liner 30 is coated with glue, the battery cell is pressed from top to bottom to ensure that the battery cell fits the liquid cooling tube.

[0205] The front of the inner tank 30 is coated with glue, and the battery cells are pressed from top to bottom to ensure that the battery cells fit tightly with the liquid cooling tubes and improve the heat dissipation efficiency.

[0206] The present embodiment proposes a novel plastic liner housing structure. Through integrated design, optimized structure, and the introduction of a liquid cooling system, the performance and reliability of the battery housing 10 are significantly improved. This design not only simplifies the component structure and reduces manufacturing costs, but also improves heat dissipation efficiency and battery system reliability through the integrated liquid cooling system and insulation design. The technical solutions of the present embodiment have broad market prospects and are applicable to various electric vehicles and energy storage systems.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: The device comprises a box, an inner liner, a battery cell, and a high-voltage electrical module. The inner liner is an insulating member and is disposed within the box. The inner liner comprises a main structure and an expansion beam. The main structure, alone or in conjunction with the inner wall of the box, forms an installation cavity. At least one expansion beam separates the installation cavity into a first cavity and a second cavity. The battery cell is disposed within the first cavity, and at least a portion of the high-voltage electrical module is disposed within the second cavity. Wherein, at least one of the expansion beam and the main structure is provided with a cavity.

2. The battery device according to claim 1, wherein: The expansion beam has a first wall and the cavity, the first wall contacts the battery cell, a first reinforcement structure is provided in the cavity, the first reinforcement structure is connected to the first wall, and the first reinforcement structure divides the cavity into a plurality of first sub-cavities.

3. The battery device according to claim 1, wherein: The main structure has a support member, which is used to support the battery cell and the high-voltage electrical module. The expansion beam is connected to the support member. The cavity and the second reinforcement structure are provided inside the support member. The second reinforcement structure divides the cavity into multiple second sub-cavities.

4. The battery device according to claim 3, wherein: At least one of the main structure and the expansion beam is a target component; the inner shell also includes a fixing structure, which is located in the second cavity and connected to the target component, and the high-voltage electrical module is connected to the target component through the fixing structure.

5. The battery device according to claim 4, wherein: The fixing structure includes a protrusion and a first fastener; the protrusion is connected to the target component, and there are multiple protrusions, and the multiple protrusions are arranged at intervals; the first fastener is embedded in the protrusion, and the high-voltage electrical module is fixed to the protrusion by the cooperation of the second fastener and the first fastener.

6. The battery device according to claim 5, wherein: The convex portion is provided with a first mounting hole, the first fastener includes a nut, the nut is arranged in the first mounting hole, and the second fastener is inserted into the first mounting hole and threadedly connected with the nut.

7. The battery device according to claim 5, wherein: The expansion beam has a first wall and a fourth wall disposed opposite to each other along a first direction, wherein the first wall contacts the battery cell; The multiple protrusions include a first protrusion, a second protrusion and a third protrusion arranged at intervals along the first direction; the first protrusion is arranged on the fourth wall, and the second protrusion and the third protrusion are arranged on the support member; the high-voltage electrical module includes a battery management system, a high-voltage control box and a relay; the high-voltage control box and the relay are respectively connected to the second protrusion; the battery management system is connected to both the first protrusion and the third protrusion, and the battery management system is arranged on the side of the high-voltage control box and the relay away from the support member.

8. The battery device according to claim 7, wherein: The first convex portion includes a strip portion and a fixing portion. The strip portion is arranged on the fourth wall and is arranged along the length direction of the expansion beam. The fixing portion is arranged on the side of the strip portion away from the fourth wall. The battery management system is connected to the fixing portion.

9. The battery device according to claim 8, wherein: The strip-shaped portion is a hollow structure.

10. The battery device according to claim 3, wherein: There are two expansion beams, and the two expansion beams are spaced apart along the first direction; the main structure also includes a side wall connected to the support member, and there are two side walls, and the two side walls and the two expansion beams are connected to form a frame; the support member has a first part and a second part arranged in sequence along the first direction, the first part and the frame form the first cavity, and the second part and the inner wall of the box form the second cavity.

11. The battery device according to claim 1, wherein: The battery device also includes a fixing member for fixing the battery cell, the fixing member is connected to the expansion beam through a third fastener, and a second mounting hole adapted for the third fastener is provided on a side of the expansion beam away from the bottom surface of the main structure.

12. The battery device according to claim 1, wherein: The main structure and the expansion beam form a combined structure. The battery device further includes a liquid cooling system, at least part of which is disposed within the combined structure.

13. The battery device according to claim 12, wherein: The combined structure is provided with a groove, and at least a portion of the liquid cooling system is arranged in the groove.

14. The battery device according to claim 13, wherein: The groove is provided on a side of the combined structure away from the battery cell.

15. The battery device according to claim 13, wherein: The main body structure is provided with a first connecting structure connecting the groove and the first cavity, and at least a portion of the liquid cooling system is in thermal conduction contact with the battery cell through the first connecting structure.

16. The battery device according to claim 15, wherein: The liquid cooling system is bonded to the battery cell.

17. The battery device according to claim 13, wherein: The main structure is provided with a second connecting structure connecting the groove and the second cavity, and the liquid cooling system has an inlet and outlet water pipe, which extends into the second cavity through the second connecting structure.

18. The battery device according to any one of claims 1 to 17, wherein: The inner liner is an integrally formed part.

19. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1-18.

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