Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a box body, single batteries and a heat exchange assembly, the box body comprises a bottom plate, a cover plate and a surrounding plate, the surrounding plate surrounds the peripheral edge of the bottom plate, the cover plate covers one end, opposite to the bottom plate, of the surrounding plate, and a containing cavity is defined by the bottom plate, the surrounding plate and the cover plate; the battery monomers are arranged on the bottom plate and are positioned in the accommodating cavity; the heat exchange assembly is arranged in the accommodating cavity, the heat exchange assembly at least comprises a first heat exchange part which is located between the battery monomers and the bottom plate and exchanges heat with the battery monomers, the first heat exchange part comprises a plurality of heat exchange units, and a hollow part is arranged at the position, corresponding to at least one heat exchange unit, of the bottom plate. The battery device provided by the utility model aims to improve the energy density of the battery device.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery device and an electrical device. Background Art

[0002] A battery device can be packaged in a housing, heat exchange components, and battery cells, and then installed in electrical equipment to provide power. However, conventional packaged battery devices are heavy, resulting in low energy density. Utility Model Content

[0003] Based on the above problems, the present application provides a battery device and an electrical device, aiming to improve the energy density of the battery device.

[0004] The present application provides a battery device, which includes a box body, a battery cell and a heat exchange assembly; the box body includes a bottom plate, a cover plate and a surrounding plate, the surrounding plate is arranged around the periphery of the bottom plate, the cover plate is arranged on one end of the surrounding plate opposite to the bottom plate, and the bottom plate, the surrounding plate and the cover plate are surrounded and define a accommodating cavity; the battery cell is arranged on the bottom plate and is located in the accommodating cavity; the heat exchange assembly is arranged in the accommodating cavity, the heat exchange assembly at least includes a first heat exchange part located between the battery cell and the bottom plate and arranged for heat exchange with the battery cell, the first heat exchange part includes a plurality of heat exchange units, and the bottom plate is provided with a hollow part at a position corresponding to at least one of the heat exchange units.

[0005] In the technical solution of the embodiments of this application, hollow portions are provided on the base plate of the battery device, corresponding to the heat exchange units. This reduces the overall weight of the battery device, thereby increasing its energy density and contributing to the lightweighting of electrical equipment. Furthermore, the hollow portions corresponding to the heat exchange units provide support and reinforcement within the heat exchange assembly structure, compensating for strength deficiencies and ensuring that the battery device meets strength requirements even when subjected to external impacts (such as ball impact testing), thus achieving a balance between lightweighting and structural reliability.

[0006] In some embodiments, a plurality of the heat exchange units are spaced apart along a first direction, each of the heat exchange units is extended along a second direction, the first direction and the second direction intersect, and the bottom plate is provided with a hollow portion at a position corresponding to each of the heat exchange units, and the hollow portion is extended along the second direction. In this embodiment, each heat exchange unit is matched with a hollow portion, which avoids unnecessary structural redundancy, further reduces the overall weight of the battery device, and improves energy density. The shape of the overlapping portion of the hollow portion and the corresponding heat exchange unit is adapted to further improve the alignment accuracy and fit tightness between the two, and further improve the structural strength and structural reliability. The layout of the heat exchange component covers a larger area, which helps to improve the heat exchange uniformity and heat exchange efficiency of the battery cell.

[0007] In some embodiments, the first heat exchange portion includes a first heat exchange pipeline, which includes a first tube, multiple second tubes, and a third tube. The multiple second tubes are spaced apart along the first direction and connected end to end. Each second tube extends along the second direction. The first tube and the third tube are disposed on either side of the multiple second tubes along the second direction. The first tube is connected to the outermost second tube, and the third tube is connected to the outermost second tube. Each second tube constitutes a heat exchange unit. In this embodiment, the first heat exchange pipeline includes the first tube, the second tube, and the third tube, which facilitates forming a complete heat exchange path and improving the overall heat conduction efficiency of the heat exchange assembly.

[0008] In some embodiments, the first heat exchange portion further includes a second heat exchange pipeline, which includes a fourth tube and multiple fifth tubes that are interconnected. The fourth tube extends along multiple sides of the base plate, and the multiple fifth tubes are arranged side by side with the multiple second tubes, with each fifth tube constituting a heat exchange unit. In this embodiment, the provision of the second heat exchange pipeline further increases the heat exchange density and uniformity of the heat exchange assembly, improving the temperature consistency and heat dissipation efficiency of the battery device under complex operating conditions.

[0009] In some embodiments, the base plate includes a first side, a second side, a third side, and a fourth side arranged in sequence from end to end. The liquid inlet and outlet of the first heat exchange pipeline and the liquid inlet and outlet of the second heat exchange pipeline are located on the first side. The fourth tube extends along the second, third, and fourth sides of the base plate. In this embodiment, the battery cells corresponding to the edges of the base plate can also achieve high-efficiency heat exchange, thereby improving overall heat exchange performance.

[0010] In some embodiments, the heat exchange unit comprises at least a tube body, wherein the tube body is a flat tube having multiple liquid channels arranged side by side along the first direction. In this embodiment, the flat tube can effectively increase the heat exchange area and uniformity of fluid distribution, thereby improving heat exchange efficiency and structural compactness.

[0011] In some embodiments, the base plate includes a main body and a connecting portion located between the two hollow portions, with a reinforcement portion provided on the side of the connecting portion facing away from the accommodating cavity. In this embodiment, by providing the connecting portion between the hollow portions and the reinforcement portion on the side facing away from the accommodating cavity, the base plate can be reduced in weight while effectively improving its structural strength and impact resistance.

[0012] In some embodiments, the cross-section of the bottom plate along the first direction includes multiple first segments, multiple second segments, and multiple curved segments. Each second segment is located between two adjacent first segments, and each end of each second segment is connected to two adjacent first segments via the curved segments in a one-to-one correspondence. The hollow portion is provided on the second segment, and the reinforcement portion is provided corresponding to the position of the first segment and connected to the second segment or the curved segment. The reinforcement portion is spaced apart from the first segment. In this embodiment, while ensuring the inherent strength of the bottom plate, the reinforcement portion can also be used to strengthen the bottom plate, thereby increasing the overall strength of the battery device.

[0013] In some embodiments, the relative distance between the first section and the battery cell is smaller than the relative distance between the second section and the battery cell, so that the first section, the second section, and the reinforcement define a buffer cavity. In this embodiment, the buffer cavity has a certain buffering and energy absorption capacity, which can disperse stress and absorb energy when subjected to external force, further enhancing the rigidity and deformation resistance of the bottom plate.

[0014] In some embodiments, the number of the reinforcement parts is multiple, and the multiple reinforcement parts are interconnected to form a whole. In this embodiment, the multiple reinforcement parts are arranged in one piece, which can simplify the structural design, reduce the difficulty of assembly, and also enhance the strength of the structure.

[0015] In some embodiments, the bottom plate and the enclosure are integrally provided. In this embodiment, the bottom plate and the enclosure are integrally provided, which reduces the assembly process, reduces the structural complexity, and improves the overall sealing and structural stability of the box.

[0016] In some embodiments, the bottom plate is provided with at least one electrophoretic liquid leakage hole. In this embodiment, the electrophoretic liquid leakage hole prevents residual liquid from causing corrosion or affecting the performance of the battery device, thereby improving production efficiency and product reliability.

[0017] The present application also provides an electrical device, which includes the battery device as described above.

[0018] 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

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an embodiment of a vehicle provided in this application;

[0021] Figure 2 A schematic diagram of the exploded structure of an embodiment of the battery device provided in this application;

[0022] Figure 3 A schematic structural diagram of an embodiment of a battery device provided in this application;

[0023] Figure 4 A bottom view of an embodiment of a battery device provided in this application;

[0024] Figure 5 for Figure 4 Middle AA section view;

[0025] Figure 6 A top view of an embodiment of a battery device provided in this application;

[0026] Figure 7 Another top view of an embodiment of a battery device provided in this application.

[0027] Description of Figure Numbers:

[0028] 1. Vehicle; 2. Controller; 3. Motor;

[0029] 10. Battery device;

[0030] 100, box body; 110, bottom plate; 111, hollow portion; 112, connecting portion; 113, reinforcement portion; 114, buffer cavity; 115, main body; 116, first section; 117, second section; 118, curved section; 120, enclosure; 130, electrophoresis leakage hole; 141, first side; 142, second side; 143, third side; 144, fourth side; 151, first portion; 152, second portion;

[0031] 200, heat exchange assembly; 210, first heat exchange portion; 211, heat exchange unit; 220, first heat exchange pipeline; 221, first tube; 222, second tube; 223, third tube; 230, second heat exchange pipeline; 231, fourth tube; 232, fifth tube; 240, bent tube;

[0032] 300. Battery cell.

[0033] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] References to "embodiments" herein 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 the 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.

[0038] 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).

[0039] 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.

[0040] 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.

[0041] With the rapid development of electric vehicles, power tools, drones, and energy storage devices, battery devices, as one of the core components of these devices, are seeing their application scenarios continue to expand. Battery devices, consisting of multiple battery cells arranged and secured in a housing, offer higher energy density and more stable performance to meet the needs of diverse applications.

[0042] In some embodiments, the battery device can be used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars. By integrating multiple battery cells into a unified energy source, the battery device provides power for the vehicle. This improves the overall energy density of the battery device, simplifies the design and maintenance of the battery management system (BMS), and enhances the vehicle's range and safety.

[0043] In some embodiments, battery devices can be used in portable devices such as power tools and drones. Due to their high energy density and compact size, battery devices are ideal for applications requiring high power output and long operating times. For example, in power tools, battery devices can provide continuous and stable power, ensuring efficient operation in various working environments. In drones, battery devices can provide sufficient flight time and payload capacity to meet diverse needs, such as aerial photography and logistics delivery.

[0044] In some embodiments, the battery assembly can be integrated into the vehicle's chassis structure. For example, a portion of the battery assembly can form at least a portion of the vehicle's floor, crossbeam, or longitudinal beam, thereby optimizing the vehicle's space utilization and overall structural strength. This design not only improves vehicle safety and stability but also reduces the need for additional installation space, further enhancing the vehicle's overall performance.

[0045] For the convenience of explanation, an embodiment of the present application provides an electric device, which is described by taking a vehicle as an example. Figure 1 As shown, Figure 1 A schematic structural diagram of a vehicle 1 provided for some embodiments of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may serve as an operating power source for the vehicle 1. The vehicle 1 may further include a controller 2 and a motor 3, and the controller 2 is used to control the battery device 10 to power the motor 3, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0046] In some embodiments, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0047] like Figure 2 As shown, Figure 2 An exploded view of a battery device 10 provided in some embodiments of the present application. The battery device 10 includes a housing 100 and a battery cell 300, with the battery cell 300 being housed in the housing 100. The housing 100 is used to provide a storage space for the battery cell 300, and the housing 100 can adopt a variety of structures. In some embodiments, the housing 100 can include a first portion 151 and a second portion 152, which cover each other and together define a storage space for accommodating the battery cell 300. The second portion 152 can be a hollow structure with one end open, and the first portion 151 can be a plate-like structure, with the first portion 151 covering the open side of the second portion 152, so that the first portion 151 and the second portion 152 together define a storage space; the first portion 151 and the second portion 152 can also be hollow structures with one side open, with the open side of the first portion 151 covering the open side of the second portion 152. Of course, the box formed by the first part 151 and the second part 152 can be in various shapes, such as a cylinder, a cuboid, etc.

[0048] In the battery device 10, there may be multiple battery cells 300, and the multiple battery cells 300 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to the multiple battery cells 300 being connected both in series and in parallel. The multiple battery cells 300 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 300 may be housed within the housing 100. Of course, the battery device 10 may also be a battery module formed by first connecting multiple battery cells 300 in series, in parallel, or in a hybrid connection, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid connection to form an entire battery unit housed within the housing 100. The battery device 10 may also include other structures, for example, the battery device 10 may further include a busbar component for electrically connecting the multiple battery cells 300.

[0049] In some embodiments, the battery cells in the battery device can be of various types, including but not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, and the like. The specific shapes of the battery cells can also be diverse, such as cylindrical battery cells, prismatic battery cells, pouch battery cells, or battery cells of other shapes. For example, prismatic battery cells can be square-cased battery cells, blade-shaped battery cells, or multi-prismatic batteries (such as hexagonal prismatic batteries) to accommodate different application requirements.

[0050] In summary, battery devices, with their flexibility, efficiency, and reliability, are widely used in a variety of fields, including electric vehicles, portable devices, and energy storage devices, driving technological progress and development across various industries. By continuously optimizing battery device design and manufacturing processes, their performance and application range will be further improved in the future to meet growing market demands.

[0051] The battery cell in the embodiment of the present application includes an electrode assembly. The electrode assembly is also called a bare cell, which is a component that stores and releases electrical energy. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrode assembly mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The part of the positive electrode collector that is not coated with the positive electrode active material layer protrudes from the part that is coated with the positive electrode active material layer. The part that is not coated with the positive electrode active material layer serves as the positive electrode tab, or a metal conductor is welded on the positive electrode collector and led out to serve as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is applied to the surface of the negative current collector. The portion of the negative current collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. The portion not coated with the negative active material layer serves as the negative electrode tab, or a metal conductor is welded to the negative current collector and extended to serve as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. It is understood that the electrode assembly can have one positive electrode tab and one negative electrode tab. In other words, the electrode assembly is provided with two sets of tabs, each set containing at least one tab, with one set being the positive electrode tab and the other being the negative electrode tab.

[0052] The electrode assembly can be a wound or laminated structure. The embodiments of the present application are not limited to this. In a wound structure, the tabs are typically welded to the current collector and then arranged in the order of positive electrode sheet - separator - negative electrode sheet - separator. This is then wound to form a cylindrical or square cell. In a laminated structure, the tabs are typically extended from the current collector. The positive electrode sheet, negative electrode sheet, and separator are then arranged in the order of positive electrode sheet - separator - negative electrode sheet - separator. These are then stacked layer by layer to form a laminated cell. The separator can be cut and laminated directly with the separator sheet, or it can be stacked in a Z-shaped fold without cutting the separator sheet. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). The separator is an insulating film placed between the positive and negative electrodes. Its primary function is to separate the positive and negative electrodes, preventing electrons from freely passing through the battery to prevent short circuits, while allowing ions in the electrolyte to freely pass between the positive and negative electrodes to form a circuit. The positive electrode sheet and the negative electrode sheet are collectively referred to as the electrode sheet. The positive electrode tab and the negative electrode tab are collectively referred to as the tab.

[0053] In some feasible embodiments, a battery device is packaged in a housing, heat exchange components, and battery cells, and then installed in an electrical device to provide power. However, conventional battery device packaging methods have the problem of being heavy in practical applications, resulting in low energy density.

[0054] The so-called energy density refers to the energy stored per unit mass or per unit volume, which are respectively called mass energy density (Wh / kg) and volume energy density (Wh / L). For battery devices, the higher the energy density, the more electrical energy can be provided at the same weight or volume, thereby improving the endurance or working efficiency of electrical equipment. However, traditional battery devices often lead to redundant overall structures and heavy weight due to the conservative design of the box structure and the selection of materials that tend to be high-strength rather than lightweight. Especially in the box part, in order to meet the mechanical strength, sealing and safety requirements, thicker metal plates or composite materials are usually used. As a result, the box itself occupies a larger proportion of the weight, while the proportion of battery cells actually used for energy storage is relatively small, thereby lowering the mass energy density of the entire system.

[0055] Low energy density can impact the user experience, specifically as follows: Low energy density directly affects the range and operating efficiency of electrical equipment. For example, in electric vehicles, if the battery pack energy density is too low, a larger battery capacity is required to maintain the same range. This not only increases vehicle weight but can also lead to reduced power performance and increased energy consumption.

[0056] Therefore, in order to improve the energy density of the battery device 10, the present application discloses a battery device 10. In one embodiment, Figure 3 As shown, the battery device 10 includes a housing 100 , a heat exchange assembly 200 and a battery cell 300 .

[0057] In this embodiment, if Figure 3 As shown, the box body 100 includes a bottom plate 110, a cover plate and a surrounding plate 120. The surrounding plate 120 is arranged around the periphery of the bottom plate 110, and the cover plate is arranged on the end of the surrounding plate 120 opposite to the bottom plate 110. The bottom plate 110, the surrounding plate 120 and the cover plate enclose and define a storage cavity. It can be understood that the storage cavity is used to accommodate the battery cells 300 and the heat exchange assembly 200 to protect the battery cells 300 and the heat exchange assembly 200. The bottom plate 110, the cover plate and the surrounding plate 120 enclose a closed or open storage cavity, which improves the sealing and safety of the internal space of the battery device 10.

[0058] like Figure 2 and Figure 3 As shown, Figure 2The first part 151 in the embodiment may be the cover plate in this embodiment; Figure 2 The second part 152 in can be Figure 3 The enclosure 120 is formed by surrounding the periphery of the bottom plate 110 .

[0059] In some feasible implementations, the shape of the bottom plate 110 can be any suitable structure such as rectangle, square, circle or polygon, and the specific shape is not limited here.

[0060] In some embodiments, the shape of the enclosure 120 can be circular, rectangular, elliptical, or polygonal, with no specific limitation herein. Optionally, the shape of the enclosure 120 can be adapted to the shape of the base plate 110 to ensure the stability and sealing of the overall structure of the box 100. For example, if a rectangular base plate 110 is used, the enclosure 120 can be designed as a rectangular frame structure formed by splicing four side panels; if a circular base plate 110 is used, the enclosure 120 can be an annular structure.

[0061] In some feasible embodiments, the cover plate has the same shape as the bottom plate 110 , so that a closed accommodating cavity is formed among the cover plate, the bottom plate 110 and the surrounding plate 120 .

[0062] In some feasible embodiments, the shape of the accommodating cavity can be a cuboid, a cylinder, a prism or other irregular geometric shapes, and the specific shape can be designed according to the arrangement of the battery cells 300 and the layout of the heat exchange assembly 200.

[0063] In this embodiment, the battery cell 300 is disposed on the bottom plate 110 and is located in the accommodating cavity.

[0064] The battery cells 300 may be arranged in a stacked manner or in a parallel manner, and the multiple battery cells 300 may be closely attached to the heat exchange assembly 200 via thermally conductive adhesive or thermally conductive gaskets.

[0065] Each battery cell 300 may be a secondary battery or a primary battery, or may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 300 may be flat, rectangular, or in other shapes.

[0066] In this embodiment, if Figure 3 As shown, the heat exchange component 200 is arranged in the accommodating cavity, and the heat exchange component 200 includes at least a first heat exchange part 210 located between the battery cell 300 and the bottom plate 110 and arranged for heat exchange with the battery cell 300. The first heat exchange part 210 includes a plurality of heat exchange units 211, and the bottom plate 110 is provided with a hollow part 111 at a position corresponding to at least one of the heat exchange units 211.

[0067] It is understood that each heat exchange unit 211 has a corresponding hollow portion 111 on the base plate 110. Hollow portions 111 are weight-reducing holes opened in corresponding areas of the base plate 110, reducing the weight of the base plate 110 and thereby increasing the energy density of the battery device 10. Furthermore, hollow portions 111 allow the heat exchange assembly 200 to directly contact an external cooling medium, such as air or coolant, thereby improving heat dissipation efficiency. This achieves efficient heat conduction while reducing the weight of the housing 100 and increasing the energy density of the battery device 10.

[0068] Optionally, the heat exchange unit 211 is a heat conducting plate or a liquid cooling pipeline.

[0069] The heat exchange assembly 200 is used to accommodate the battery cells 300 in the cavity for heat exchange, so as to regulate the temperature of the battery cells 300 so that the temperature of the battery cells 300 is maintained within an appropriate range. The inlet and outlet of the heat exchange assembly 200 are located at one end of the box body, forming a cooling circuit to exchange heat with the battery cells 300. Specifically, the heat exchange assembly 200 or the first heat exchange part 210 can have various shapes, such as a U-shaped tube, a meandering tube, etc. In addition, the heat exchange assembly 200 can be a single piece or a plurality of pipes spliced ​​together, which can be selected according to the cooling requirements of the battery cells 300. The heat exchange assembly 200 can include multiple heat exchange channels, and the multiple heat exchange channels can be connected in series or in parallel. In this way, the diversity of the heat exchange channel arrangement can be increased, and the adaptability of the heat exchange assembly 200 can be improved. The heat exchange assembly 200 can be made of various materials, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, etc. Of course, no matter what structure the heat exchange assembly 200 has, it includes at least one heat exchange unit 211. The heat exchange unit 211 can be a heat exchange tube or a heat exchange segment, etc. A hollow portion 111 is provided in the bottom plate 110 corresponding to each heat exchange unit 211, which can improve the energy density of the battery device 10.

[0070] It is worth noting that the first heat exchange portion 210 can directly contact the battery cells 300 to exchange heat, or it can exchange heat with the battery cells 300 through a heat exchange medium. The first heat exchange portion 210 can be a partial heat exchange structure in the heat exchange assembly 200, or it can be the entire heat exchange assembly 200. For example, the heat exchange assembly 200 can also include other heat exchange portions, such as a second heat exchange portion. The second heat exchange portion can be located between adjacent battery cells 300 or between the enclosure and the battery cells 300.

[0071] It is understood that the battery cells 300 are arranged above the heat exchange assembly 200 so that the heat generated by them can be conducted to the outside of the battery device 10 through the heat exchange assembly 200, or can be further diffused to the outside of the battery device 10 through the hollow portion 111. In some feasible embodiments, a fluid flows within the heat exchange assembly 200. For example, the fluid can be water. When the temperature of the battery cells 300 is low, the temperature of the fluid is higher than that of the battery cells 300. The heat of the fluid can be transferred to the battery cells 300 to increase the temperature of the battery cells 300, thereby maintaining the operating temperature of the battery cells 300 within a suitable range and improving the operating time of the battery cells 300. When the temperature of the battery cells 300 is too high, the temperature of the fluid is lower than that of the battery cells 300. The heat of the battery cells 300 can be transferred to the fluid to reduce the temperature of the battery cells 300. This allows the operating temperature of the battery cells 300 to remain within a suitable range and improve the operating time of the battery cells 300.

[0072] Optionally, the battery cell 300 may be directly disposed in contact with the heat exchange assembly 200 , or a heat medium may be disposed between the battery cell 300 and the heat exchange assembly 200 to achieve contact.

[0073] It should be noted that in the area where the hollow portion 111 is provided, the material of the bottom plate 110 in this area is partially removed to achieve the purpose of weight reduction, but by arranging the heat exchange unit 211 at the corresponding position, it is possible to form an effective structural support for the hollow area, that is, the heat exchange unit 211 is used as a reinforcing rib. For example, when subjected to external impact, such as a ball hit test, the heat exchange unit 211 can work with the box body 100 structure to jointly bear the impact force, thereby compensating for the problem of local strength weakening caused by the hollowing. That is to say, in the area where the hollow portion 111 is not provided, the bottom plate 110 itself has complete structural strength and can independently withstand the corresponding mechanical load. The area with the hollow portion 111 in the bottom plate 110 can withstand the corresponding mechanical load through the heat exchange unit 211 at the corresponding position. In this way, the battery device 10 as a whole meets the lightweight requirements while still having good structural strength and impact resistance.

[0074] In the technical solution of the present embodiment, a hollow portion 111 is provided on the base plate 110 of the battery device 10, corresponding to the heat exchange unit 211. This reduces the overall weight of the battery device 10, thereby increasing its energy density and contributing to the lightweighting of electrical equipment. Furthermore, the hollow portion 111, corresponding to the heat exchange unit 211, leverages the structure of the heat exchange assembly 200 for support and reinforcement, thereby compensating for strength deficiencies and ensuring that the battery device 10 still meets strength requirements even when subjected to external impacts (such as a ball impact test), thus achieving a balance between lightweighting and structural reliability.

[0075] In one embodiment, if Figure 4 and Figure 6 As shown, the number of the hollow portions 111 on the bottom plate 110 corresponds to the number of the heat exchange units 211 , and the bottom plate 110 is provided with a hollow portion 111 at a position corresponding to each heat exchange unit 211 .

[0076] It is understood that a corresponding hollow portion 111 is provided on the bottom plate 110 directly below each heat exchange unit 211, so that each heat exchange unit 211 has an independent and matching heat dissipation channel, thereby improving heat conduction efficiency. For example, if the heat exchange assembly 200 includes five heat exchange units 211, then the bottom plate 110 also has five corresponding hollow portions 111, and they are disposed one by one below each heat exchange unit.

[0077] Optionally, the hollow portion 111 is adapted to the shape of the corresponding heat exchange unit 211. It is understandable that the hollow portion 111 is adapted and designed according to the shape of the corresponding heat exchange unit 211. On the one hand, it can ensure a good spatial fit between the heat exchange unit 211 and the hollow portion 111, thereby improving assembly accuracy and heat conduction efficiency; on the other hand, it can avoid affecting the strength of the base plate 110 due to excessive gaps or structural misalignment, thereby ensuring structural reliability while reducing weight. In some examples, when the heat exchange unit 211 is a rectangular heat conduction plate, the corresponding hollow portion 111 is also rectangular; when the heat exchange unit 211 is an arc-shaped liquid cooling pipeline, the corresponding hollow portion 111 is designed as a corresponding arc-shaped or elliptical structure.

[0078] In this embodiment, if Figure 6 As shown, the heat exchange units 211 are spaced apart along a first direction and extend along a second direction, with the first and second directions intersecting. Thus, the multiple heat exchange units 211 are sequentially spaced apart along the first direction, maintaining a certain distance between each heat exchange unit 211, thereby avoiding structural redundancy and achieving weight reduction. Furthermore, each heat exchange unit 211 extends along the second direction, thereby creating a larger heat exchange contact area, which helps improve heat exchange efficiency with the battery cells 300.

[0079] Optionally, the first direction and the second direction are perpendicular to each other, so that the overall heat exchange assembly 200 has a fence-like structure, which not only facilitates processing and assembly, but also improves structural stability and support strength while ensuring heat dissipation performance. This helps to achieve lightweight battery device 10.

[0080] In this embodiment, the hollow portion 111 is extended along the second direction, that is, the hollow portion 111 has the same extension direction as the heat exchange unit 211, so that when the heat exchange unit 211 is arranged in the hollow portion 111, the shapes of the hollow portion 111 and the heat exchange unit 211 can be better adapted, thereby effectively reducing the weight of the base plate 110.

[0081] It should be noted that the specific shape and structure of the heat exchange assembly 200 may be as shown in the following embodiment, but the following embodiment is only one of the various embodiments of the heat exchange assembly 200, and the specific shape of the heat exchange assembly 200 is not limited in this application. The key is that the heat exchange assembly 200 has a heat exchange unit 211, and the bottom plate 110 is provided with a hollow portion 111 corresponding to the heat exchange unit 211 to reduce weight and improve energy density.

[0082] In one embodiment, if Figure 7 As shown, the first heat exchange pipeline 220 includes a first tube body 221, multiple second tube bodies 222 and a third tube body 223. The multiple second tube bodies 222 are arranged at intervals along the first direction and are connected end to end in sequence. Each second tube body 222 is extended along the second direction. The first tube body 221 and the third tube body 223 are arranged on both sides of the multiple second tube bodies 222 along the second direction. The first tube body 221 is connected to the outermost second tube body 222, and the third tube body 223 is connected to the outermost second tube body 222. Each second tube body 222 is a heat exchange unit 211.

[0083] Optionally, the first tube body 221 , the second tube body 222 and the third tube body 223 are integrally connected.

[0084] In this embodiment, the first heat exchange pipe 220 can directly contact the battery cells 300 or indirectly contact them through a heat-conducting medium, ensuring that the heat generated by the battery cells 300 can be quickly and effectively transferred away, thereby maintaining the optimal operating temperature of the battery device 10. The cooling or heating medium can circulate within the first heat exchange pipe 220 to achieve uniform temperature control of the battery cells 300.

[0085] In some feasible embodiments, the number of second tubes 222 can be sufficient to cover the entire length of the bottom plate 110 along the first direction to achieve comprehensive heat exchange. Of course, the number of second tubes 222 can also be distributed along a portion of the length of the bottom plate 110 along the first direction. In this way, more heat exchange pipes can be installed in the remaining positions, thereby achieving increased local heat exchange density. The length position emphasizes the coverage of the second tubes 222 along the first direction.

[0086] In some feasible embodiments, the first direction and the second direction are perpendicular, thus forming a fence-like structure, enhancing structural stability and optimizing the fluid flow path. Furthermore, the base plate 110 is a square base plate 110, and the first direction is the direction of two opposing sides, i.e., the direction extending along a pair of opposing sides of the base plate 110; the second direction is the direction of the other two opposing sides, i.e., the direction perpendicular to the first direction and extending along the other pair of opposing sides of the base plate 110. This arrangement allows the plurality of second tubes 222 to be spaced apart along the first direction and extend along the second direction, forming a regular and uniform heat exchange layout, which is beneficial for improving overall heat exchange efficiency and structural stability.

[0087] Each of the second tubes 222 serves as a heat exchange unit 211 , that is, a hollow portion 111 is provided in the bottom plate 110 at a position corresponding to each of the second tubes 222 to reduce weight while ensuring structural support.

[0088] It should be noted that the distance between each two second tubes 222 is not limited here, and is determined by the actual heat exchange efficiency required. The smaller the distance, the higher the heat exchange performance. Of course, the smaller the distance, the higher the weight, so a balanced design is required based on the required heat exchange efficiency. It should also be noted that the extension length of each second tube 222 is not limited here. It is only necessary to leave a certain position in the bottom plate 110 for installing the first tube 221 and the third tube 223. Similarly, the extension length of the second tube 222 depends on the actual heat exchange efficiency required. The longer the second tube 222 is extended, the higher the heat exchange efficiency, and correspondingly, the greater the weight.

[0089] In one possible implementation, Figure 7 As shown, when the specific number of the plurality of second tubes 222 is odd, the plurality of second tubes 222 are spaced apart along the first direction and connected end to end, forming two diagonally spaced first and second liquid-passing ends. One end of the first tube 221 is connected to the first liquid-passing end, and the other end of the first tube 221 extends along the first direction toward the side where the second liquid-passing end is located. Optionally, the third tube 223 includes a first main section and a second main section arranged in an L-shape. One end of the first main section is connected to the second liquid-passing end, and the other end of the first main section extends along the first direction toward the side where the first liquid-passing end is located. The second main section extends along the second direction. In this way, the first tube 221 and the third tube 223 form ports located on the same side, which can serve as a liquid inlet and outlet, respectively. It can be understood that in this case, the second main section extending along the second direction in the third tube body 223 can also serve as the heat exchange unit 211, that is, the position of the bottom plate 110 corresponding to the second main section of the third tube body 223 can be correspondingly provided with a hollow portion 111.

[0090] In one possible embodiment (not shown), if the specific number of the plurality of second tubes 222 is even, the plurality of second tubes 222 are spaced apart along the first direction and connected end-to-end, forming two first and second liquid-passing ends located on the same side. The shapes of the first tube 221 and the third tube 223 are not limited herein. Optionally, one end of the first tube 221 is connected to the first liquid-passing end, and the other end of the first tube 221 extends along the first direction toward the side where the second liquid-passing end is located. The third tube 223 includes a first main section, a second main section, and a third main section arranged in a U-shape. The first main section is connected to the second liquid-passing end and extends along the second direction. The second main section extends along the first direction toward the side where the first liquid-passing end is located. The third main section extends along the second direction. In this manner, the first tube 221 and the third tube 223 form ports located on the same side, which can serve as liquid inlets and liquid storage ports. It can be understood that in this case, the first main section and the third main section extending along the second direction in the third tube body 223 can also serve as the heat exchange unit 211, that is, the positions of the bottom plate 110 corresponding to the first main section and the third main section of the third tube body 223 can be correspondingly provided with a hollow portion 111.

[0091] In one embodiment, if Figure 6 As shown, the first heat exchange part 210 also includes a second heat exchange pipeline 230, and the second heat exchange pipeline 230 includes a fourth tube body 231 and multiple fifth tube bodies 232 that are interconnected. The fourth tube body 231 is extended along multiple side edges of the bottom plate 110, and the multiple fifth tube bodies 232 are arranged side by side with the multiple second tube bodies 222. Each of the fifth tube bodies 232 is a heat exchange unit 211.

[0092] Optionally, the fourth tube body 231 and the fifth tube body 232 are integrally connected.

[0093] In this embodiment, the second heat exchange line 230 can directly contact the battery cells 300 or indirectly contact them through a heat-conducting medium, ensuring that the heat generated by the battery cells 300 can be quickly and effectively transferred away, thereby maintaining the optimal operating temperature of the battery device 10. The cooling or heating medium can circulate within the first heat exchange line 220 to achieve uniform temperature control of the battery cells 300.

[0094] The first heat exchange unit 210 includes a first heat exchange line 220 and a second heat exchange line 230. These two heat exchange lines further increase the heat exchange density and uniformity of the heat exchange assembly 200, improving the temperature consistency and heat dissipation efficiency of the battery device 10 under complex operating conditions. It will be appreciated that the first heat exchange unit 210 includes the first heat exchange line 220 and the second heat exchange line 230. Of course, in other embodiments, more heat exchange lines may also be included. This adds additional heat exchange paths to the existing system, allowing heat to be removed from multiple directions and improving overall heat exchange capacity.

[0095] In some feasible embodiments, the number of second tubes 222 can be sufficient to cover the entire length of the bottom plate 110 along the first direction to achieve comprehensive heat exchange. The number of second tubes 222 can also be distributed along a portion of the length of the bottom plate 110 along the first direction. In this way, more heat exchange pipes can be installed in the remaining positions, thereby achieving increased local heat exchange density. The length position emphasizes the coverage of the second tubes 222 along the first direction.

[0096] It is understood that the plurality of fifth tubes 232 are arranged side by side with the plurality of second tubes 222. In other words, the plurality of fifth tubes 232 are spaced apart along the first direction, similarly to the second tubes 222. This effectively utilizes the effective area of ​​the base plate 110 and maximizes heat exchange. Furthermore, the fifth tubes 232 also extend along the second direction. The length of the fifth tubes 232 can be the same as or different from the length of the second tubes 222, which is not limited herein.

[0097] In some feasible embodiments, the fourth tube body 231 is extended along multiple sides of the bottom plate 110, that is, multiple fourth tube bodies 231 can form a U-shaped structure, or a bent, annular or multi-section spliced ​​enclosure structure, etc., to enclose a heat exchange area with or without an opening; the heat exchange area is used to accommodate and arrange at least one fifth tube body 232, so that when the fluid flows through the second heat exchange pipeline 230, it can achieve more sufficient heat exchange between different heat exchange sections, thereby improving the overall heat exchange efficiency and space utilization. It is also worth noting that the first heat exchange pipeline 220 can also be set in the above-mentioned heat exchange area. If the first heat exchange part 210 also includes more heat exchange pipelines, the other multiple heat exchange pipelines can also be set in the above-mentioned heat exchange area.

[0098] Each of the fifth tubes 232 serves as a heat exchange unit 211 , that is, a hollow portion 111 is provided at a position of the bottom plate 110 corresponding to each of the fifth tubes 232 , so as to reduce weight while ensuring structural support.

[0099] It should be noted that the distance between each pair of fifth tubes 232 and second tubes 222 is not limited here, and specifically depends on the actual heat exchange efficiency required. The smaller the distance, the higher the heat exchange performance. Of course, the smaller the distance, the higher the weight, so a balanced design is required based on the required heat exchange efficiency. It should also be noted that the extension length of each fifth tube 232 and second tube 222 is not limited here. It is only necessary to leave a certain position in the bottom plate 110 for installing the third tube 223 and the fourth tube 231. Similarly, the extension length of the fifth tube 232 and the second tube 222 depends on the actual heat exchange efficiency required. The longer the fifth tube 232 and the second tube 222 are extended, the higher the heat exchange efficiency and, correspondingly, the greater the weight.

[0100] In one embodiment, if Figure 6 As shown, the base plate 110 includes a first side 141, a second side 142, a third side 143 and a fourth side 144 arranged in sequence from head to tail, the liquid inlet and outlet ends of the first heat exchange pipeline 220 and the liquid inlet and outlet ends of the second heat exchange pipeline 230 are arranged on the first side 141, and the fourth tube body 231 extends along the second side 142, the third side 143 and the fourth side 144 of the base plate 110.

[0101] The fourth tube body 231 plays a surrounding or supporting role and can be a U-shaped enclosure structure for defining a heat exchange area, enclosing multiple first heat exchange sections therein, and guiding the fluid flow or enhancing the overall structural strength.

[0102] It is understandable that the inlet and outlet ports of the heat exchange pipeline are centrally located on the first side 141 of the base plate 110, facilitating connection and integration with an external cooling system, improving assembly efficiency, and simplifying the overall piping design of the battery device 10. The fourth tube 231 extends along the remaining three sides, effectively covering the edge area of ​​the base plate 110, enhancing the thermal management capabilities of the edge battery cells 300, and avoiding temperature gradient differences caused by poor heat dissipation in the edge area, thereby improving the overall thermal uniformity and service life of the battery device 10. In addition, this piping arrangement also enhances the symmetry and compactness of the structure, which is conducive to the efficient use of the internal space of the battery device 10.

[0103] In one embodiment, the heat exchange unit 211 is at least composed of a tube body, the tube body is a flat tube, the tube body has a plurality of liquid channels, and the plurality of liquid channels are arranged side by side along the first direction.

[0104] The tube body has multiple liquid channels to increase the fluid flow area and improve heat exchange efficiency. The liquid channels within the tube body can be flat, circular, elliptical, or polygonal, and other structural forms. The specific configuration can be selected and arranged based on actual heat exchange requirements, spatial layout, and manufacturing process, thereby achieving better heat exchange performance and structural adaptability. It is understood that by increasing the fluid flow area per unit length, heat exchange efficiency can be improved.

[0105] Of course, in other embodiments, the shape of the tube is not limited and can be a flat tube, or other structural forms such as a round tube, an elliptical tube, or a polygonal cross-section tube. In the case of a flat tube structure, not only is the contact area with the battery cell 300 increased, achieving more uniform heat conduction, but it also allows for better spatial layout, improves space utilization, and enhances overall integration, thereby reducing the volume of the battery device 10.

[0106] In one embodiment, if Figure 7 As shown, the heat exchange assembly 200 further includes a plurality of bent tubes 240. Every two second tubes 222, or every two fifth tubes 232, are connected by at least one bent tube 240. In this embodiment, the bent tubes 240 enhance the structural strength and thermal conductivity continuity of the heat exchange assembly 200, while optimizing space utilization and improving overall heat exchange performance.

[0107] In this embodiment, the first tube body 221, the second tube body 222, the third tube body 223 and multiple bent tube bodies 240 are connected together to form the first heat exchange pipeline 220; the fourth tube body 231, the fifth tube body 232 and multiple bent tube bodies 240 are connected together to form the second heat exchange pipeline 230.

[0108] Optionally, the curved tube 240 is arc-shaped, that is, the curved tube 240 extends along an arc, and the fluid flow directions at both ends of the curved tube 240 form a certain angle. Thus, the curved tube 240 can change the flow direction of the fluid, thereby increasing the heat exchange area of ​​the first heat exchange section and improving the heat exchange efficiency of the first heat exchange section. Furthermore, the curved shape of the curved tube 240 can reduce the flow resistance of the fluid and reduce the pressure drop, thereby increasing the flow rate of the fluid and further improving the heat exchange efficiency of the first heat exchange section.

[0109] Optionally, the number of first bends between every two second tubes 222 or every two fifth tubes 232 can be one, two, three, or more. The first bends can cause the multiple second tubes 222 and the multiple fifth tubes 232 to be arranged in a circuitous manner, thereby increasing the heat exchange area of ​​the first heat exchange pipeline 220 and the second heat exchange pipeline 230 and improving the heat exchange efficiency.

[0110] In the above technical solution, the provision of the bent tube 240 allows the first and second heat exchange lines 220, 230 to extend in a circuitous manner. This increases the contact area between each battery cell 300 and the first and second heat exchange lines 220, 230, thereby increasing the heat exchange area and improving the heat exchange efficiency of the first and second heat exchange lines 220, 230. Furthermore, the provision of the bent tube 240 makes the structure of the first heat exchange section more compact, occupies less space overall, and facilitates the miniaturization of the battery device 10, thereby ensuring the volumetric energy density of the battery device 10.

[0111] In one feasible embodiment, both ends of the second tube 222 are connected to the two third tubes 223 respectively, which can be achieved by the bent tube 240, that is, the bent tube 240 is connected to the corresponding third tubes 223. The same applies to the fourth tube 231 and the fifth tube 232.

[0112] In one embodiment, if Figure 5 As shown, the bottom plate 110 includes a main body portion 115 and a connecting portion 112 located between the two hollow portions 111 . A reinforcing portion 113 is provided on a side of the connecting portion 112 facing away from the accommodating cavity.

[0113] It can be understood that by providing a connecting portion 112 between the hollow portions 111 and providing a reinforcing portion 113 on the side thereof away from the accommodating cavity, the weight of the base plate 110 can be reduced while effectively improving the structural strength and impact resistance.

[0114] It's important to note that between each two hollow sections 111, a portion of base plate 110 retains material, serving as connecting sections 112 to maintain the overall structural integrity of base plate 110. Furthermore, reinforcement 113 can be one or more of a reinforcing plate, reinforcing ribs, a thickened area, or other reinforcing structures. Thus, the hollow sections 111 achieve lightweighting, while the connecting sections 112 and reinforcing sections 113 enhance structural rigidity in critical stress-bearing areas.

[0115] Optionally, the reinforcing portion 113 and the connecting portion 112 have the same shape, which makes the structure more reliable.

[0116] In one embodiment, if Figure 4 and Figure 5 As shown, the plurality of hollow portions 111 and the plurality of connecting portions 112 are staggered and arranged along the first direction, and the plurality of hollow portions 111 and the plurality of connecting portions 112 are extended along the second direction. In this embodiment, the hollow portions 111 and the connecting portions 112 are staggered and arranged along the first direction and extended along the second direction, which is conducive to achieving uniformity of the structural layout and maximizing heat exchange efficiency.

[0117] Alternatively, in the above embodiment, the connecting portion 112 can be specifically defined as an area located between the two hollow portions 111, and further extends and protrudes toward the ends of the two hollow portions 111 based on this area, that is, a dumbbell-shaped or I-shaped hollow portion 111 is formed. In this way, the connecting portion 112 not only connects the adjacent hollow portions 111, but also forms an extension structure at both ends of the hollow portions 111, thereby providing a more reasonable spatial layout for the arrangement of the reinforcement portion 113, which can effectively enhance the reinforcement capacity of the reinforcement plate. The reinforcement portion 113 can be correspondingly arranged on the side of the connecting portion 112 away from the accommodating cavity and protrude from both ends of the two hollow portions 111 to enhance the local structural strength and load-bearing capacity. Optionally, the shape of the reinforcement portion 113 can be designed to be dumbbell-shaped, I-shaped, or other structural forms with enhanced rigidity. By optimizing the cross-sectional shape, the bending and torsional properties are improved, thereby further enhancing the overall structural stability and mechanical properties of the base plate 110.

[0118] In some feasible embodiments, the main body 115 of the base plate 110 and each connecting portion 112 are arranged in a stepped manner. That is, the main body 115 and the connecting portion 112 are not in the same plane, but there is a certain height difference between the main body 115 and the connecting portion 112, thereby forming a groove body that is recessed toward the accommodating cavity. In this way, a corresponding reinforcement portion 113 is provided on each groove body, and the reinforcement portion 113 is covered on the groove body and together with the groove body defines a buffer cavity 114. The buffer cavity 114 can be a closed or semi-closed space with a certain buffering and energy absorption capacity. When subjected to external force impact, it can disperse stress and absorb energy, further enhancing the overall rigidity and deformation resistance of the base plate 110.

[0119] In one embodiment, if Figure 5 As shown, the cross-section of the bottom plate 110 along the first direction includes a plurality of first segments 116, a plurality of second segments 117, and a plurality of curved segments 118. Each second segment 117 is located between two adjacent first segments 116. The two ends of each second segment 117 are connected to two adjacent first segments 116 in a one-to-one correspondence via the curved segments 118. The hollow portion 111 is provided on the second segment 117. The reinforcement portion 113 is provided corresponding to the position of the first segment 116 and is connected to the second segment 117 or the curved segment 118. The reinforcement portion 113 is spaced apart from the first segment 116. The relative distance between the first segment 116 and the battery cell 300 is smaller than the relative distance between the second segment 117 and the battery cell 300, so that the first segment 116, the second segment 117, and the reinforcement portion 113 define a buffer cavity 114.

[0120] like Figure 5The cross-sectional view shown may be understood as a cross section of the bottom plate 110 along the first direction, ie, a cross section formed by cutting the bottom plate 110 along the first direction at the plane where the bottom plate 110 is cut.

[0121] It can be understood that the multiple first segments 116, multiple second segments 117, and multiple curved segments 118 allow the base plate 110 to achieve local lightweighting while maintaining overall strength. Specifically, the first segment 116 is the main support portion of the base plate 110, with high rigidity and load-bearing capacity; the second segment 117 is used to accommodate the hollow portion 111 to reduce weight; and the curved segment 118 serves as a transition area, ensuring structural continuity and smooth transitions, while also absorbing external impact forces to a certain extent and enhancing deformation resistance.

[0122] The relative distance between the first section 116 and the battery cell 300 is smaller than the relative distance between the second section 117 and the battery cell 300, so that the first section 116, the second section 117 and the reinforcement 113 enclose a buffer cavity 114. This design forms a groove body that is recessed toward the accommodating cavity. Specifically, the first section 116 is close to one side of the battery cell 300 and provides the main support function; the second section 117 is away from the battery cell 300 and is mainly used to reduce weight and arrange the hollow portion 111; and the reinforcement 113 is located near the first section 116, but maintains a certain distance from it, thereby forming a closed or semi-closed buffer cavity 114 between the two. The buffer cavity 114 can disperse stress and absorb energy when subjected to external impact, effectively protecting the internal battery cell 300 from damage. At the same time, this recessed design also increases the surface area of ​​the bottom plate 110, which helps to further improve the heat dissipation effect.

[0123] It should be noted that among the first section 116, the second section 117, and the curved section 118, the first section 116 is the connecting portion 112, that is, the structural portion located between the two hollow sections 111, which is used to maintain the overall continuity and mechanical strength of the base plate 110 between the hollow areas; the second section 117 is connected to the adjacent first section 116 through the curved section 118, thereby forming a certain height difference between the two. In this way, not only the deformation resistance of the base plate 110 is enhanced, but also good spatial adaptability is provided for the overall layout. Among them, the second section 117 is provided with a hollow section 111 to achieve local weight reduction and provide space for the heat exchange component 200 to contact the external cooling medium.

[0124] In one feasible embodiment, the shape of the buffer cavity 114 can be dumbbell-shaped or I-shaped. That is, in the cross section of the bottom plate 110 along the first direction and avoiding the second tube body 222 and the fifth tube body 232, the length of the first section 116 can be set to be larger, and the length of the second section 117 can be correspondingly set to be shorter. In this way, the corresponding first section 116, second section 117, and curved section 118 can form a wider trough, enhancing the structure's buffering and energy absorption capabilities. In other words, the connecting portion 112 is not limited to the area located between the two hollow portions 111, but can also be specifically defined as a portion extending further toward the ends of the two hollow portions 111 based on this area (equivalent to the position outside the second tube body 222 and the fifth tube body 232 in the cross section of the bottom plate 110), thereby effectively supporting and strengthening the surrounding area of ​​the heat exchange assembly 200 in terms of structure.

[0125] In a feasible embodiment, since the second tube body 222, the third tube body 223, the fourth tube body 231, the fifth tube body 232 and the bent tube body 240 are provided on the bottom plate 110, any cross-section selected along the first direction of the bottom plate 110 needs to satisfy that the first section 116 avoids the second tube body 222, the third tube body 223, the fourth tube body 231, the fifth tube body 232 and the bent tube body 240, and that the second section 117 corresponds to the second tube body 222 and the fifth tube body 232.

[0126] For example, when the battery assembly 10 is used in a new energy vehicle, the base plate 110 serves as a critical support structure for the battery cells 300. It must possess sufficient strength to support the weight and possess good impact resistance to withstand the vibrations and impacts caused by complex road conditions. Through the above embodiment, the buffer cavity 114 can absorb some of the impact energy generated by the battery assembly 10 during minor collisions or bumps, reducing the impact on the internal battery cells 300.

[0127] In one embodiment, if Figure 4 As shown, there are multiple reinforcement parts 113, and the multiple reinforcement parts 113 are interconnected to form a whole.

[0128] It should be noted that the reinforcement portion 113 can be a reinforcement plate, which has the same layout as the bottom plate 110, that is, a hollow area is provided at the corresponding position for adapting and installing with the bottom plate 110 having the hollow portion 111. In this way, the assembly complexity can be simplified and the overall structural strength can be enhanced. Figure 2 As shown, the plurality of reinforcement portions 113 form a whole reinforcement plate, which is covered on the bottom plate.

[0129] In one embodiment, the bottom plate 110 is integrally provided with the enclosure 120. In this embodiment, the bottom plate 110 and the enclosure 120 are integrally provided, which reduces the assembly process and structural complexity, and improves the overall sealing and structural stability of the box body 100.

[0130] The base plate 110 and the enclosure 120 are simultaneously formed or directly welded together during the manufacturing process, eliminating the need for auxiliary materials such as sealants and foam for sealing and cushioning in traditional structures. This also eliminates the corresponding assembly steps, streamlining the overall manufacturing process. By eliminating sealing materials that are prone to aging and failure, the long-term reliability of the enclosure 100 is also enhanced, avoiding leakage or structural loosening caused by sealing material failure.

[0131] In one embodiment, if Figure 4 As shown, at least one electrophoretic liquid leakage hole 130 is formed on the bottom plate 110. In this embodiment, the electrophoretic liquid leakage hole 130 prevents residue from causing corrosion or affecting the performance of the battery device 10, thereby improving production efficiency and product reliability.

[0132] During the electrophoretic coating process on the welded housing 100, the electrophoretic liquid can easily seep into enclosed spaces or structural corners within the housing 100. If not promptly drained after coating, this can not only lead to residual liquid and increased weight, but can also cause corrosion and rust during subsequent use, impacting the durability and safety of the product. Therefore, providing electrophoretic liquid leakage holes 130, particularly around the sides of the heat exchange assembly 200 and other areas prone to liquid accumulation, can effectively ensure that the electrophoretic liquid is smoothly drained from the housing 100 after coating, preventing residue and improving coating quality and drying efficiency, thereby ensuring product consistency, reliability, and long-term corrosion resistance.

[0133] Optionally, at least one electrophoretic fluid leakage hole 130 is provided on the bottom plate 110 at a position corresponding to the periphery of the heat exchange assembly 200, allowing the electrophoretic fluid in the cavity to be smoothly discharged from the cavity of the housing 100 after the coating process is completed. This arrangement effectively prevents electrophoretic fluid from remaining in the area surrounding the heat exchange assembly 200, preventing corrosion, rust, or coating defects caused by liquid retention, thereby improving the product's surface treatment quality and long-term reliability.

[0134] In one embodiment, if Figure 3 As shown, the enclosure 120 includes a plurality of side panels, which are arranged around the periphery of the base plate 110 and connected end to end. In this embodiment, the enclosure 120 is composed of a plurality of side panels connected end to end, which facilitates processing and assembly, and the structural form can be flexibly adjusted according to actual needs to improve applicability.

[0135] Exemplarily, the plurality of side panels may be a first side panel, a second side panel, a third side panel, and a fourth side panel connected in sequence, and an angle may be formed between the first side panel and the second side panel, and the angle may be 90°; an angle may be formed between the second side panel and the third side panel, and the angle may be 90°; an angle may be formed between the third side panel and the fourth side panel, and the angle may be 90°; an angle may be formed between the fourth side panel and the first side panel, and the angle may be 90°; the bottom panel 110 may be mounted on the bottom surfaces of the plurality of side panels, and the angles between the bottom panel 110 and the first side panel, the second side panel, the third side panel, and the fourth side panel are all 90°. Exemplarily, the box body is an integral stamped part, for example, a metal plate may be pressed, a portion of the metal plate is configured as the bottom panel 110, and another portion of the metal plate is configured as a plurality of sides connected in sequence along the outer periphery of the bottom panel 110, which can simplify the forming process of the box body.

[0136] Optionally, multiple side panels are integrally formed, so that a more stable connection can be achieved between the multiple side panels, which not only improves the rigidity of the overall structure, but also enhances the local bearing capacity and impact resistance.

[0137] This application also provides an electrical device, which includes a battery device 10. It should be noted that the specific implementation of the battery device 10 refers to all the above embodiments. Since this electrical device includes the battery device 10, it has at least all the beneficial effects of the above battery device 10, which will not be detailed here.

[0138] The electrical device may be a new energy vehicle, energy storage system, electric bicycle, drone, communication base station equipment, or other electronic equipment and transportation that requires the battery device 10 as a power or energy storage unit. The use of the battery device 10 with a higher energy density can improve the performance of the electrical device, thereby enhancing the user experience.

[0139] 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 battery device comprises: A box body, the box body comprising a bottom plate, a cover plate and a surrounding plate, the surrounding plate being arranged around the periphery of the bottom plate, the cover plate being arranged on an end of the surrounding plate opposite to the bottom plate, and the bottom plate, the surrounding plate and the cover plate enclose and define a accommodating cavity; a battery cell, the battery cell being disposed on the bottom plate and located in the accommodating cavity; and A heat exchange component is arranged in the accommodating cavity, and the heat exchange component includes at least a first heat exchange part located between the battery cell and the bottom plate and arranged for heat exchange with the battery cell. The first heat exchange part includes a plurality of heat exchange units, and the bottom plate is provided with a hollow part at a position corresponding to at least one of the heat exchange units.

2. The battery device according to claim 1, wherein: The plurality of heat exchange units are spaced apart along the first direction, each heat exchange unit is extended along the second direction, the first direction and the second direction intersect, the bottom plate is provided with the hollow portion corresponding to the position of each heat exchange unit, and the hollow portion is extended along the second direction.

3. The battery device according to claim 2, wherein: The first heat exchange portion includes a first heat exchange pipeline, which includes a first tube body, multiple second tube bodies and a third tube body. The multiple second tube bodies are arranged at intervals along the first direction and are connected end to end in sequence. Each second tube body extends along the second direction. The first tube body and the third tube body are arranged on opposite sides of the multiple second tube bodies along the second direction. The first tube body is connected to the outermost second tube body, and the third tube body is connected to the outermost second tube body. Each second tube body constitutes a heat exchange unit.

4. The battery device according to claim 3, wherein: The first heat exchange part also includes a second heat exchange pipeline, the second heat exchange pipeline includes a fourth tube body and multiple fifth tube bodies that are interconnected, the fourth tube body extends along multiple side edges of the bottom plate, and the multiple fifth tube bodies are arranged side by side with the multiple second tube bodies, and each fifth tube body is a heat exchange unit.

5. The battery device according to claim 4, wherein: The base plate includes a first side, a second side, a third side and a fourth side arranged in sequence from beginning to end, the liquid inlet and outlet ends of the first heat exchange pipeline and the liquid inlet and outlet ends of the second heat exchange pipeline are arranged on the first side, and the fourth tube body extends along the second side, the third side and the fourth side of the base plate.

6. The battery device according to any one of claims 2 to 5, characterized in that: The heat exchange unit is at least composed of a tube body, which is a flat tube. The tube body has a plurality of liquid channels, and the plurality of liquid channels are arranged side by side along the first direction.

7. The battery device according to any one of claims 1 to 5, characterized in that: The bottom plate includes a main body and a connecting portion located between the two hollow portions. A reinforcing portion is provided on a side of the connecting portion facing away from the accommodating cavity.

8. The battery device according to claim 7, wherein: The cross-section of the bottom plate along the first direction includes multiple first sections, multiple second sections and multiple curved sections, each of the second sections is located between two adjacent first sections, and both ends of each second section are connected to the two adjacent first sections one-to-one through the curved sections. The hollow portion is provided on the second section, and the reinforcement portion is provided at a position corresponding to the first section and is connected to the second section or the curved section. The reinforcement portion is spaced apart from the first section.

9. The battery device according to claim 8, wherein: The relative distance between the first section and the battery cell is smaller than the relative distance between the second section and the battery cell, so that a buffer cavity is defined between the first section, the second section and the reinforcement portion.

10. The battery device according to claim 7, wherein: There are multiple reinforcement parts, and the multiple reinforcement parts are interconnected to form a whole.

11. The battery device according to any one of claims 1 to 5, characterized in that: The bottom plate and the enclosure plate are integrally arranged.

12. The battery device according to any one of claims 1 to 5, characterized in that: At least one electrophoresis leakage hole is provided on the bottom plate.

13. An electrical device, characterized in that: The electrical equipment comprises the battery device according to any one of claims 1 to 12.

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