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 and a battery monomer, the box body is provided with a bottom plate assembly, the bottom plate assembly comprises multiple layers of plate bodies and at least two foaming buffer layers, and the multiple layers of plate bodies are stacked in the thickness direction of the bottom plate assembly; the two foaming buffer layers are respectively connected to two opposite surfaces of one plate body, or the two foaming buffer layers are respectively connected to the surfaces of the two plate bodies; and the battery monomers are arranged in the box body and are placed on the bottom plate assembly. According to the technical scheme provided by the invention, the at least two foaming buffer layers are arranged in the bottom plate assembly, so that the impact protection performance of the bottom plate assembly is improved.

Description

Technical Field

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

[0002] In existing new energy vehicles, the battery device is usually installed at the bottom of the vehicle body, considering the functional layout of the vehicle body. To provide protection for the battery device, battery manufacturers generally install a bottom plate assembly at the bottom of the battery device box to support and impact-protect the battery cells inside the box with the help of the bottom plate assembly. However, the impact protection performance of the current bottom plate assembly is still insufficient. Utility Model Content

[0003] The main purpose of this application is to propose a battery device and an electrical device, aiming to improve the problem of insufficient impact protection performance of the bottom plate assembly of the current battery device.

[0004] In a first aspect, the battery device proposed in this application includes:

[0005] A box body, the box body having a bottom plate assembly, the bottom plate assembly including a plurality of plates stacked along its thickness direction, and at least two foam buffer layers, the two foam buffer layers being respectively connected to two opposite surfaces of one of the plates, or the two foam buffer layers being respectively connected to surfaces of two of the plates; and

[0006] The battery cell is arranged in the box and placed on the bottom plate assembly.

[0007] In the technical solution provided by the present application, at least two layers of foam buffer layers are set up using the multi-layer plate body in the base plate assembly as the basis. When the base plate assembly encounters an impact condition, the impact force is transmitted from the outside to the inside. The plate body close to the outside can disperse the single-point impact to a part of the plane. The deformation of the plane transmits the impact force to the foam buffer layer with a larger area. The foam buffer layer can absorb energy through its own deformation, thereby delaying and weakening the transmission of the impact force, thereby improving the impact protection performance of the base plate assembly. The setting of at least two layers of foam buffer layers can rationally utilize the surface of the multi-layer plate body as a connection basis without changing or less changing the overall structure of the existing multi-layer base plate.

[0008] In some embodiments, the two foamed buffer layers include a first foamed buffer layer, and the first foamed buffer layer is located between two adjacent plates and connected to a surface of one of the plates.

[0009] In the above technical solution, a first foam buffer layer is arranged between two adjacent layers of boards. Under the isolation protection of the two layers of boards, the risk of the first foam buffer layer being damaged or falling off due to external scratches is low, and the first foam buffer layer can maintain sufficient impact protection performance.

[0010] In some embodiments, the multi-layer plate comprises:

[0011] an inner lining plate, supporting the battery cell; and

[0012] a bottom guard plate, located on a side of the inner lining plate facing away from the battery cell;

[0013] Wherein, the first foaming buffer layer is connected to the surface of the inner lining plate facing the bottom guard plate, or the first foaming buffer layer is connected to the surface of the bottom guard plate facing the inner lining plate.

[0014] In the above technical solution, since the first buffer portion is arranged on the inner lining plate or the bottom guard plate, it means that before the bottom guard plate and the inner lining plate are assembled, the first buffer portion can be pre-formed based on the inner lining plate or the bottom guard plate. Compared with the solution of filling the foam buffer material after the bottom guard plate and the inner lining plate are assembled, the molding process of the first foam buffer layer in the above technical solution is simpler; not only that, the first foam buffer layer is only connected to one of the inner lining plate or the bottom guard plate, which makes it easier to disassemble and replace the bottom guard plate.

[0015] In some embodiments, the thickness of the first foamed buffer layer is greater than 1 mm.

[0016] In the above technical solution, the thickness of the first foamed buffer layer is set to be greater than 1 mm, which can ensure that the first foamed buffer layer has a minimum impact protection performance.

[0017] In some embodiments, the thickness of the first foamed buffer layer is between 3 mm and 8 mm.

[0018] In the above technical solution, the thickness of the first foam buffer layer is limited to between 3 mm and 8 mm. The thickness of 3 mm means that the first foam buffer layer can cope with most impact conditions, while the thickness of 8 mm can limit the thickness of the first foam buffer layer to a reasonable range, preventing the first foam buffer layer from occupying too much internal space of the battery device.

[0019] In some embodiments, the multi-layer plate comprises:

[0020] an inner lining plate, supporting the battery cell; and

[0021] a bottom guard plate, located on a side of the inner lining plate facing away from the battery cell;

[0022] The two foam buffer layers include a second foam buffer layer, and the second foam buffer layer is connected to the surface of the bottom guard plate facing away from the battery cell.

[0023] In the above technical solution, the second foam buffer layer is arranged on the outer surface of the bottom guard plate, which can prevent the impact of gravel and reduce the noise generated by the impact. Not only that, the second foam buffer layer can also cover the outer surface of the bottom guard plate, giving the bottom guard plate a certain corrosion resistance and improving the service life of the bottom guard plate.

[0024] In some embodiments, the two foam buffer layers include a first foam buffer layer, the first foam buffer layer is connected to the surface of the inner lining plate facing the bottom guard plate, or the first foam buffer layer is connected to the surface of the bottom guard plate facing the inner lining plate;

[0025] Wherein, the thickness of the first foaming buffer layer is greater than the thickness of the second foaming buffer layer.

[0026] In the above technical solution, the thickness of the first foam buffer layer is greater than the thickness of the second foam buffer layer, which means that the first foam buffer layer plays a major impact protection role. The first foam buffer layer is arranged between the inner lining plate and the bottom guard plate. The first foam buffer layer can be protected by the bottom guard plate, so that the first foam buffer layer can maintain sufficient impact protection performance. It also means that the second foam buffer layer mainly plays the role of surface covering. This thick and thin foam buffer layer distribution design enables the bottom plate assembly to take into account both strong impact protection performance and corrosion resistance.

[0027] In some embodiments, the foamed buffer layer is made of polyvinyl chloride.

[0028] In the above technical solution, the material of the foam buffer layer is set to polyvinyl chloride. With the help of the many excellent properties of polyvinyl chloride, the foam buffer layer can withstand the high temperature heating of the high-temperature baking process, reducing the process difficulty of setting the foam buffer layer on the plate body. In addition, polyvinyl chloride is a material used in large quantities in battery devices. Setting the material of the foam buffer layer to polyvinyl chloride is conducive to controlling the processing cost of the bottom plate assembly.

[0029] In some embodiments, the multi-layer plate body includes an inner lining plate, and the inner lining plate supports the battery cells;

[0030] At least two layers of the foam buffer layer are located on a side of the inner liner plate facing away from the battery cell.

[0031] In the above technical solution, at least two foam buffer layers are arranged on the side of the inner lining plate away from the battery cell, which means that the inner lining plate can directly contact and support the battery cell, which is conducive to ensuring the stability of the battery cell installation.

[0032] In some embodiments, the multi-layer plate body includes a bottom guard plate disposed away from the battery cells, and the bottom guard plate is formed with a drainage hole.

[0033] In the above technical solution, drainage holes are provided on the bottom guard plate to actively drain the accumulated water (such as rainwater, car wash water or condensation water) that invades from the outside, which is helpful to reduce the degree of corrosion of the bottom plate assembly caused by the retention of accumulated water.

[0034] In a second aspect, the present application further proposes an electrical device comprising the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 A simplified structural diagram of an embodiment in which the electrical equipment provided in this application is a vehicle;

[0037] Figure 2 A schematic diagram of the exploded structure of an embodiment of the battery device provided in this application;

[0038] Figure 3 This is a structural schematic diagram of an embodiment of a box in a battery device provided in this application;

[0039] Figure 4 for Figure 3 Structural diagram of the middle section AA;

[0040] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the part B in the middle;

[0041] Figure 6 for Figure 5 Schematic diagram of the exploded structure of the middle lining plate and bottom guard plate.

[0042] Description of Figure Numbers:

[0043] 1000. Vehicle;

[0044] 100, battery device; 200, controller; 300, motor;

[0045] 1. Box body; 11. Box body; 12. Box cover; 13. Bottom plate assembly; 13a. Plate body; 131. Liner plate; 132. Bottom guard plate; 1321. Drain hole; 13b. Foam buffer layer; 133. First foam buffer layer; 134. Second foam buffer layer; 2. Battery cell;

[0046] X, thickness direction.

[0047] 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

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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).

[0053] 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.

[0054] 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.

[0055] The battery device disclosed in the embodiments of the present application can be used to provide power to electrical devices, wherein the electrical devices may be, but are not limited to, battery vehicles, electric vehicles, ships, spacecraft, etc. Among them, spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0056] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0057] Please refer to Figure 1 , Figure 1 The electrical equipment provided for this application is a simplified structural diagram of an embodiment of a vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0058] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0059] For easier understanding of the battery device 100 provided in this application, please refer to Figure 2 , Figure 2 This is a schematic diagram of the exploded structure of an embodiment of the battery device 100 provided in this application. The battery device 100 generally includes a box body 1 and a battery cell 2. An installation cavity is formed in the box body 1, and the battery cell 2 is loaded through the installation cavity. The basic structure of the box body 1 generally includes a box body 11 and a box cover 12. The box cover 12 is arranged on the box body 11 and together with the box body 11 define the installation cavity. Generally speaking, the battery cell 2 is generally arranged in the box body 11. After the battery device 100 is mounted on the vehicle 1000, the box cover 12 is generally close to the vehicle 1000, and the box body 11 is generally away from the vehicle 1000; the installation cavity can be mainly formed in the box body 11. In this case, the box body 11 can be understood as a basin-shaped structure, and the box cover 12 is covered on the box body 11 to cover the installation cavity; the installation cavity can also be mainly formed in the box cover 12. In this case, the box cover 12 can be understood as a cover-shaped structure. The box cover 12 is covered on the box body 11 to cover the battery cell 2 carried on the box body 11 into the box cover 12. Of course, the structure of the box body 1 is not limited to this.

[0060] The number of battery cells 2 in the box 1 can be one or more. When multiple battery cells 2 are provided, the multiple battery cells 2 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that multiple battery cells 2 are both connected in series and in parallel. Multiple battery cells 2 can be directly connected in series, in parallel, or in a mixed connection to form a battery as a whole. Of course, multiple battery cells 2 can also be in the form of battery modules that are first connected in series, in parallel, or in a mixed connection, and multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a battery as a whole. The battery device 100 can also include other structures, such as a busbar component, for achieving electrical connection between multiple battery cells 2 or multiple battery modules. Each battery cell 2 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 2 can be cylindrical, flat, rectangular, or in other shapes.

[0061] In the present application, battery cells 2 may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the present application embodiments do not limit this. Battery cells 2 may be cylindrical, flat, rectangular, or in other shapes, etc., and the present application embodiments do not limit this. Battery cells 2 are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the present application embodiments do not limit this.

[0062] The structure of a battery cell 2 generally includes a shell, an end cap, an electrode assembly, and electrode terminals. The end cap is positioned over the opening of the shell and, together with the shell, defines a housing cavity. The electrode assembly is positioned within the housing cavity. The electrode terminal extends through the end cap and is electrically connected to the electrode assembly's tabs via a transition component. The electrode assembly is the component within the battery cell 2 where electrochemical reactions occur. It is primarily formed by winding or stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative electrode tabs can be located together at one end of the main body or separately at both ends of the main body. During the battery's charge and discharge processes, the positive and negative electrode active materials react with the electrolyte filled within the shell.

[0063] In existing new energy vehicles, considering the functional layout of the vehicle body, the battery device is usually installed at the bottom of the vehicle body. During driving, the vehicle will inevitably encounter gravel sections and bumpy sections. In gravel sections, the gravel crushed by the wheels is easy to splash around at the bottom of the vehicle body, which may hit the battery device, causing deformation and damage to the battery device. In bumpy sections, the battery device at the bottom of the vehicle body may directly hit the road surface, causing damage to the battery device. In order to provide protection for the battery device, current battery manufacturers usually set a bottom plate assembly at the bottom of the battery device box to use the bottom plate assembly to support and impact protect the battery cells inside the box.

[0064] However, the impact protection performance of the bottom plate assembly of the current battery device is still insufficient. The reason is that the bottom plate assembly usually includes a plurality of layers of plates stacked along its thickness direction, and the periphery of each plate is connected to the box frame by bolts. The areas with larger areas in the middle are usually spaced apart from each other. Although buffer deformation spaces can be formed between the spaced-apart plates, the contribution of these buffer deformation spaces to the impact protection performance of the bottom plate assembly is always limited. Therefore, the impact protection performance of the bottom plate assembly of the current battery device is insufficient.

[0065] Consider making full use of the multi-layer plate body and providing a foam buffer layer on the plate body. While slightly increasing the weight of the floor assembly, it can significantly improve the impact protection performance of the floor guard plate. In view of this, the present application provides a battery device. When the battery device provided by the present application is used in a vehicle, it can at least improve the problem of insufficient impact protection performance of the floor assembly of the current battery device.

[0066] To facilitate understanding of the battery device provided by the present application, the following description is provided with reference to the accompanying drawings, wherein: Figure 3 This is a structural schematic diagram of an embodiment of a box in a battery device provided in this application; Figure 4 for Figure 3 Structural diagram of the middle section AA; Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the part B in the middle; Figure 6 for Figure 5 Schematic diagram of the exploded structure of the middle lining plate and bottom guard plate.

[0067] See also Figures 3 to 5 In one embodiment of the present application, the battery device 100 includes a box body 1 and a battery cell 2. The box body 1 has a bottom plate assembly 13. The bottom plate assembly 13 includes a multi-layer plate body 13a stacked along its thickness direction X, and at least two foam buffer layers 13b. The two foam buffer layers 13b are respectively connected to the two opposite surfaces of one layer of the plate body 13a, or the two foam buffer layers 13b are respectively connected to the surfaces of the two plate bodies 13a; the battery cell 2 is arranged in the box body 1 and placed on the bottom plate assembly 13.

[0068] It should be noted that the box body 1 is generally composed of a box cover 12 and a box body 11, and the bottom plate assembly 13 is generally a part of the box body 11. This embodiment specifies that the bottom plate assembly 13 has a multi-layer plate body 13a stacked along its thickness direction X. The multi-layer plate body 13a can generally be understood as a combination of an inner lining plate 131 and a bottom guard plate 132. For the solution where the box body 11 includes a frame, the inner lining plate 131 can be directly connected to the frame, and the bottom guard plate 132 can be indirectly connected to the frame through the inner lining plate 131, or the bottom guard plate 132 can be directly connected to the frame, and the inner lining plate 131 can be indirectly connected to the frame through the bottom guard plate 132. This embodiment does not limit this. The thickness direction X of the bottom plate assembly 13 generally refers to the height direction of the box body 1, that is, the direction in which the box cover 12 and the box body 11 are connected. The bottom plate assembly 13 also includes at least two layers of foamed buffer layers 13b. The foamed buffer layers 13b can be two layers, or three or more layers, depending on the number of multi-layered plates 13a. For example, when the multi-layered plates 13a are three layers, the foamed buffer layers 13b can be disposed between two adjacent layers of plates 13a, or on the surfaces of the innermost and outermost plates 13a facing away from the other plates 13a. A maximum of four layers can be provided. In this embodiment, the two layers of foamed buffer layers 13b can be connected to one of the plates 13a and distributed on both sides of the plate 13a along the thickness direction X. The two layers of foamed buffer layers 13b can also be disposed on two different plates 13a, which is not limited in this embodiment.

[0069] "Foamed buffer layer 13b" refers to a surface structure with a buffering effect made by a foaming process. The buffering performance of the foamed buffer layer 13b is derived from the synergistic effect of its internal porous structure and the viscoelasticity of the material. The closed cells, open cells, and bubbles evenly distributed inside the foamed buffer layer 13b can absorb kinetic energy through bending, compression or rupture of the bubble wall when impacted, thereby converting mechanical energy into heat energy dissipation. At the same time, the foamed buffer layer 13b is mostly made of polymer materials (such as polyurethane, EVA). The viscoelastic properties of polymer materials cause the foamed buffer layer 13b to produce a hysteresis effect during the deformation process, which can further delay the transmission of the impact force, thereby achieving energy absorption and shock absorption protection, and is suitable for buffering requirements of different loads and frequencies. It is worth mentioning that the material of the above-mentioned at least two layers of foamed buffer layers 13b should be the same. This embodiment does not limit the specific material of the foamed buffer layer 13b. “Two opposite surfaces of one layer of plate body 13a” refers to the two opposite surfaces of the layer of plate body 13a along the above-mentioned thickness direction X. Similarly, in “two layers of foamed buffer layers 13b are respectively connected to the surfaces of the two plate bodies 13a”, “the surfaces of the two plate bodies 13a” refers to the surfaces of the plate body 13a in the thickness direction X.

[0070] "The battery cell 2 is placed on the bottom plate assembly 13" means that the bottom plate assembly 13 supports the battery cell 2, and there may be structural glue or locking structure between the battery cell 2 and the bottom plate assembly 13 for fixed connection. Of course, the battery cell 2 may also be placed directly on the bottom plate assembly 13 and fixed by other beam structures in the box body 1. The bottom plate assembly 13 may specifically support the battery cell 2 through the innermost plate body 13a, or it may support the battery cell 2 through the foam buffer layer 13b arranged on the innermost plate body 13a. This embodiment does not limit this.

[0071] In the technical solution provided in the present application, the multi-layer plate body 13a in the bottom plate assembly 13 is used as the basis to set at least two layers of foam buffer layers 13b. When the bottom plate assembly 13 encounters an impact condition, the impact force is transmitted from the outside to the inside. The plate body 13a close to the outside can disperse the single-point impact to a part of the plane. The deformation of the plane transmits the impact force to the foam buffer layer 13b with a larger area. The foam buffer layer 13b can absorb energy through its own deformation, thereby delaying and weakening the transmission of the impact force, so that the impact protection performance of the bottom plate assembly 13 is improved. The setting of at least two layers of foam buffer layers 13b can rationally utilize the surface of the multi-layer plate body 13a as a connection basis without changing or less changing the overall structure of the existing multi-layer bottom plate.

[0072] See also Figure 5 and Figure 6 In some embodiments, the two foaming buffer layers 13b include a first foaming buffer layer 133. The first foaming buffer layer 133 is located between two adjacent plates 13a and connected to the surface of one of the plates 13a.

[0073] For ease of distinction, this embodiment defines one of the foamed buffer layers 13b as the first foamed buffer layer 133. "The first foamed buffer layer 133 is located between two adjacent plates 13a and is connected to the surface of one of the plates 13a." It can be understood that the first foamed buffer layer 133 is connected to the surface of one of the plates 13a facing the adjacent plate 13a.

[0074] In the above technical solution, a first foam buffer layer 133 is arranged between two adjacent layers of plate bodies 13a. Under the isolation protection of the two layers of plate bodies 13a, the risk of the first foam buffer layer 133 being damaged or falling off due to external scratches is low, and the first foam buffer layer 133 can maintain sufficient impact protection performance.

[0075] See also Figure 5 and Figure 6In some embodiments, the multilayer board body 13a includes an inner lining plate 131 and a bottom guard plate 132, the inner lining plate 131 supports the battery cell 2; the bottom guard plate 132 is located on the side of the inner lining plate 131 away from the battery cell 2; wherein, the first foaming buffer layer 133 is connected to the surface of the inner lining plate 131 facing the bottom guard plate 132, or the first foaming buffer layer 133 is connected to the surface of the bottom guard plate 132 facing the inner lining plate 131.

[0076] The "inner lining plate 131" supports the battery cell 2, and can also be understood as the inner lining plate 131 being the plate 13a located at the innermost side of the box body 1 among the multiple plates 13a. In some embodiments, the inner lining plate 131 also has a heat exchange portion capable of performing heat exchange with the battery cell 2, such as a heat exchange channel, a heat exchange tube or a heating film, etc., and the "bottom guard plate 132" is the plate 13a located at the outermost side (bottom side) of the box body 1 among the multiple plates 13a. It is usually the first to be impacted under impact conditions. The inner lining plate 131 and the bottom guard plate 132 usually have a high supporting strength, and their materials are usually metal alloys, including but not limited to aluminum alloys, magnesium alloys, etc. The first foaming buffer layer 133 is connected to the surface of the inner lining plate 131 facing the bottom guard plate 132, which means that the first foaming buffer layer 133 is arranged on the inner lining plate 131 and is on the side facing the bottom guard plate 132; the first foaming buffer layer 133 is connected to the surface of the bottom guard plate 132 facing the inner lining plate 131, which means that the first foaming buffer layer 133 is arranged on the bottom guard plate 132 and is on the side facing the inner lining plate 131.

[0077] In the above technical solution, since the first buffer portion is arranged on the surface of the inner lining plate 131 or the bottom guard plate 132, it means that before the bottom guard plate 132 and the inner lining plate 131 are assembled, the first buffer portion can be pre-formed based on the surface of the inner lining plate 131 or the bottom guard plate 132. Compared with the solution of filling the foam buffer material after the bottom guard plate 132 and the inner lining plate 131 are assembled, the molding process of the first foam buffer layer 133 in the above technical solution is simpler; not only that, the first foam buffer layer 133 is only connected to one of the inner lining plate 131 or the bottom guard plate 132, which makes it easier to disassemble and replace the bottom guard plate 132.

[0078] In some embodiments, the thickness of the first foamed buffer layer 133 is greater than 1 mm.

[0079] It should be noted that the "thickness of the first foaming buffer layer 133" refers to the dimension of the first foaming buffer layer 133 in the above-mentioned thickness direction X. This embodiment does not limit the specific thickness of the first foaming buffer layer 133, and its thickness can be any value greater than 1 mm, for example, 1.1 mm, 2.1 mm, 3.1 mm, etc.

[0080] In the above technical solution, the thickness of the first foaming buffer layer 133 is set to be greater than 1 mm, which can ensure that the first foaming buffer layer 133 has a minimum impact protection performance.

[0081] In some embodiments, the thickness of the first foamed buffer layer 133 is between 3 mm and 8 mm.

[0082] This embodiment further limits the thickness of the first foaming buffer layer 133 to between 3 mm and 8 mm, and also does not limit the specific thickness of the first foaming buffer layer 133. The thickness can be any value between 3 mm and 8 mm, for example, 3 mm, 4.5 mm, 6.7 mm, 8 mm, etc.

[0083] In the above technical solution, the thickness of the first foam buffer layer 133 is limited to between 3 mm and 8 mm. The thickness of 3 mm means that the first foam buffer layer 133 can cope with most impact conditions, while the thickness of 8 mm can limit the thickness of the first foam buffer layer 133 to a reasonable range, preventing the first foam buffer layer 133 from occupying too much internal space of the battery device 100.

[0084] See also Figure 5 and Figure 6 In some embodiments, the multi-layer board body 13a includes an inner lining plate 131 and a bottom guard plate 132, the inner lining plate 131 supports the battery cell 2; the bottom guard plate 132 is located on the side of the inner lining plate 131 away from the battery cell 2; the two-layer foam buffer layer 13b includes a second foam buffer layer 134, and the second foam buffer layer 134 is connected to the surface of the bottom guard plate 132 away from the battery cell 2.

[0085] The "inner lining plate 131" and "bottom guard plate 132" have been explained above and will not be repeated in this embodiment. For ease of distinction, this embodiment defines one of the foamed buffer layers 13b as the second foamed buffer layer 134. The second foamed buffer layer 134 is connected to the surface of the bottom guard plate 132 facing away from the battery cell 2. It can be understood that the second foamed buffer layer 134 is provided at the bottom of the bottom guard plate 132, that is, on the outer surface of the bottom guard plate 132.

[0086] In the above technical solution, the second foam buffer layer 134 is arranged on the outer surface of the bottom guard plate 132, which can prevent the impact of gravel and reduce the noise generated by the impact. Not only that, the second foam buffer layer 134 can also cover the outer surface of the bottom guard plate 132, giving the bottom guard plate 132 a certain corrosion resistance and improving the service life of the bottom guard plate 132.

[0087] In some embodiments, the two-layer foaming buffer layer 13b includes a first foaming buffer layer 133, the first foaming buffer layer 133 is connected to the surface of the inner lining plate 131 facing the bottom guard plate 132, or the first foaming buffer layer 133 is connected to the surface of the bottom guard plate 132 facing the inner lining plate 131; wherein, the thickness of the first foaming buffer layer 133 is greater than the thickness of the second foaming buffer layer 134.

[0088] In conjunction with the instructions Figure 6 , it can be clearly determined that the thickness of the first foaming buffer layer 133 is greater than the thickness of the second foaming buffer layer 134 .

[0089] In the above technical solution, the thickness of the first foam buffer layer 133 is greater than the thickness of the second foam buffer layer 134, which means that the first foam buffer layer 133 plays a major impact protection role. The first foam buffer layer 133 is arranged between the inner lining plate 131 and the bottom guard plate 132. The first foam buffer layer 133 can be protected by the bottom guard plate 132, so that the first foam buffer layer 133 can maintain sufficient impact protection performance. It also means that the second foam buffer layer 134 mainly plays the role of surface covering. This distribution design of one thick and one thin foam buffer layer 13b enables the bottom plate assembly 13 to take into account both strong impact protection performance and corrosion resistance.

[0090] In some embodiments, the two layers of foam buffer layers 13 b include a first foam buffer layer 133 , and the first foam buffer layer 133 is connected to a surface of the bottom guard plate 132 facing the inner lining plate 131 .

[0091] In the above technical solution, the first foaming buffer layer 133 and the second foaming buffer layer 134 are respectively arranged on both sides of the bottom guard plate 132 facing the inner lining plate 131 and away from the inner lining plate 131, which means that the above-mentioned two layers of foaming buffer layers 13b are processed independently on the bottom guard plate 132 at the same time, and then the two layers of foaming buffer layers 13b are assembled with the inner lining plate 131 through the bottom guard plate 132, which is conducive to reducing the processing difficulty of the two layers of foaming buffer layers 13b.

[0092] In some embodiments, the foam buffer layer 13b is made of polyvinyl chloride.

[0093] "Polyvinyl chloride (PVC)" foam cushioning material has many excellent properties such as vibration resistance, lightweight, chemical corrosion resistance, high resilience (rebound rate ≥ 60%), high temperature resistance and low water absorption.

[0094] In the above technical solution, the material of the foam buffer layer 13b is set to polyvinyl chloride. With the help of the above-mentioned many excellent properties of polyvinyl chloride, the foam buffer layer 13b can withstand the high temperature heating of the high-temperature baking process, reducing the process difficulty of setting the foam buffer layer 13b on the plate body 13a. In addition, polyvinyl chloride is a material used in large quantities in the battery device 100. Setting the material of the foam buffer layer 13b to polyvinyl chloride is beneficial to controlling the processing cost of the bottom plate assembly 13.

[0095] In some embodiments, the foaming buffer layer 13b has a material melting point greater than or equal to 180°C.

[0096] This embodiment does not limit the specific value of the melting point of the material of the foamed buffer layer 13b, which can be any temperature value greater than or equal to 180°C, for example, 190°C, 200°C, 220°C, etc.

[0097] In the above technical solution, the melting point of the material of the foaming buffer layer 13b is limited to greater than or equal to 180°C, so that the foaming buffer layer 13b can withstand the high-temperature heating of the high-temperature baking process, so that the setting of the foaming buffer layer 13b can be before the high-temperature baking process, thereby reducing the process difficulty of setting the foaming buffer layer 13b on the plate body 13a.

[0098] In some embodiments, the multi-layer board body 13 a includes an inner lining board 131 , which supports the battery cell 2 ; and at least two foam buffer layers 13 b are located on a side of the inner lining board 131 away from the battery cell 2 .

[0099] "At least two layers of foam buffer layers 13b are located on the side of the inner lining plate 131 facing away from the battery cell 2" means that the surface of the inner lining plate 131 facing the battery cell 2 directly supports the battery cell 2, and at least two layers of foam buffer layers 13b can still be optionally set on the same plate body 13a, or respectively set on two plates 13a, but at least the inner surface of the inner lining plate 131 facing the battery cell 2 should be reserved for the placement of the battery cell 2.

[0100] In the above technical solution, at least two foam buffer layers 13b are arranged on the side of the inner lining plate 131 away from the battery cell 2, which means that the inner surface of the inner lining plate 131 can directly contact and support the battery cell 2, which is conducive to ensuring the installation stability of the battery cell 2.

[0101] When the battery device 100 is in a water-crossing condition, it is difficult to avoid water from the environment from invading between the bottom guard plate 132 and the inner lining plate 131. Long-term immersion in water may aggravate the corrosion of the bottom plate assembly 13. In view of this, please refer to Figure 6 In some embodiments, the multi-layer board body 13 a includes a bottom guard plate 132 disposed away from the battery cell 2 , and the bottom guard plate 132 is formed with a drainage hole 1321 .

[0102] The phrase "bottom guard plate 132 is formed with a drainage hole 1321" means that the drainage hole 1321 is provided on the bottom guard plate 132 and extends through the bottom guard plate 132 along the thickness direction X. Because water tends to flow downwards under the influence of gravity, the drainage hole 1321 is typically provided at a relatively low position on the bottom guard plate 132 to ensure that accumulated water is drained.

[0103] In the above technical solution, drainage holes 1321 are provided on the bottom guard plate 132 to actively drain the accumulated water (such as rainwater, car wash water or condensed water) that invades from the outside, which is helpful to reduce the degree of corrosion of the bottom plate assembly 13 caused by the retention of accumulated water.

[0104] This application also proposes an electrical device, which includes a battery device 100. The battery device 100 is used to provide electrical energy. The specific structure of the battery device 100 is referred to the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here. Among them, the battery device 100 is used to provide electrical energy to the electrical device, which includes but is not limited to new energy vehicles such as pure electric vehicles, hybrid vehicles, and extended-range vehicles, and may also include aircraft such as electric drones and electric passenger aircraft.

[0105] The present application proposes a battery device 100, which includes a box body 1 and a battery cell 2. The box body 1 has a bottom plate assembly 13, and the bottom plate assembly 13 includes an inner lining plate 131 and a bottom guard plate 132 stacked in its thickness direction X. The inner lining plate 131 supports the battery cell 2, and the bottom guard plate 132 is located on the side of the inner lining plate 131 away from the battery cell 2. The surface of the inner lining plate 131 away from the battery cell 2 is connected to a first foam buffer layer 133, and the surface of the bottom guard plate 132 away from the battery cell 2 is connected to a second foam buffer layer 134. The material of the first foam buffer layer 133 and the second foam buffer layer 134 is both polyvinyl chloride, and the melting point of the material can reach above 180°C. The thickness of the first foam buffer layer 133 is greater than the thickness of the second foam buffer layer 134.

[0106] 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: include: A box body, the box body having a bottom plate assembly, the bottom plate assembly including a plurality of plates stacked along its thickness direction, and at least two foam buffer layers, the two foam buffer layers being respectively connected to two opposite surfaces of one of the plates, or the two foam buffer layers being respectively connected to surfaces of two of the plates; and The battery cell is arranged in the box and placed on the bottom plate assembly.

2. The battery device according to claim 1, wherein: The two foaming buffer layers include a first foaming buffer layer, which is located between two adjacent plates and connected to the surface of one of the plates.

3. The battery device according to claim 2, wherein: The multi-layer plate body comprises: an inner lining plate, supporting the battery cell; and a bottom guard plate, located on a side of the inner lining plate facing away from the battery cell; Wherein, the first foaming buffer layer is connected to the surface of the inner lining plate facing the bottom guard plate, or the first foaming buffer layer is connected to the surface of the bottom guard plate facing the inner lining plate.

4. The battery device according to claim 2 or 3, characterized in that The thickness of the first foamed buffer layer is greater than 1 mm.

5. The battery device according to claim 4, wherein: The thickness of the first foaming buffer layer is between 3 mm and 8 mm.

6. The battery device according to claim 1, wherein: The multi-layer plate body comprises: an inner lining plate, supporting the battery cell; and a bottom guard plate, located on a side of the inner lining plate facing away from the battery cell; The two foam buffer layers include a second foam buffer layer, and the second foam buffer layer is connected to the surface of the bottom guard plate facing away from the battery cell.

7. The battery device according to claim 6, wherein: The two foam buffer layers include a first foam buffer layer, the first foam buffer layer is connected to the surface of the inner lining plate facing the bottom guard plate, or the first foam buffer layer is connected to the surface of the bottom guard plate facing the inner lining plate; Wherein, the thickness of the first foaming buffer layer is greater than the thickness of the second foaming buffer layer.

8. The battery device according to any one of claims 1 to 3, characterized in that: The foaming buffer layer is made of polyvinyl chloride.

9. The battery device according to any one of claims 1 to 3, characterized in that: The multi-layer plate body includes an inner lining plate, and the inner lining plate supports the battery cell arrangement; At least two layers of the foam buffer layer are located on a side of the inner liner plate facing away from the battery cell.

10. The battery device according to any one of claims 1 to 3, characterized in that: The multi-layer plate body includes a bottom guard plate arranged away from the battery cells, and the bottom guard plate is formed with a drainage hole.

11. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 10.

Images