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, a buffer structure and a battery monomer, the box body is provided with a bottom plate assembly, the bottom plate assembly comprises at least two layers of plate bodies which are stacked along the thickness direction of the bottom plate assembly, the two layers of plate bodies are provided with a spacing area and a fitting area, and the fitting area is provided with a gap between the spacing area and the fitting area. At least one plate body is provided with a groove sunken towards the other plate body, the two layers of plate bodies comprise inner lining plates, and the groove comprises first sub-grooves formed in the inner lining plates; the buffer structure comprises a first buffer structure arranged in the first sub-groove; and the battery monomers are arranged in the box body and are mounted on the bottom plate assembly. According to the technical scheme, the plate body of the bottom plate assembly is concavely arranged and connected with another plate body, the overall rigidity of the bottom plate assembly is improved, on the basis, the buffering structure is arranged in the groove formed by concaving of the plate body, the buffering energy absorption performance of the groove can be enhanced, and therefore the impact protection performance of the bottom plate assembly is guaranteed.

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 at least two layers of plates stacked along the thickness direction thereof, the two layers of plates having spaced-apart areas and mutually abutted and connected areas, at a position corresponding to the abutted areas, at least one of the plates having a groove recessed toward the other plate body, the two layers of plates including an inner lining plate located on the inner side of the box body, the groove including a first sub-groove provided on the inner lining plate;

[0006] a buffer structure disposed in the groove, the buffer structure comprising a first buffer structure disposed in the first sub-groove; and

[0007] The battery cell is disposed in the box and mounted on the bottom plate assembly.

[0008] In the technical solution provided in the present application, the bottom plate assembly is used to install battery cells. The two layers of plates in the bottom plate assembly have a spacing area and a fitting area. Corresponding to the fitting area, at least one of the plates has a groove that is recessed toward the other plate, so that the two layers of plates can be fitted and connected at the position of the groove. Similarly, based on the recessed arrangement of the groove toward the other plate, the fitting area can be set directly below the battery cell, that is, at a position with lower stiffness and modality on the two layers of plates, so as to reduce the degree of deformation of the bottom plate assembly when the battery device is subjected to vibration impact. On this basis, the two layers of plates are spaced apart from each other in the spacing area, and the cavity formed between the two has good cushioning effect. Impact energy absorption effect. Not only that, the technical solution also uses the groove of the plate body to set a buffer structure, which can enhance the buffer energy absorption effect at the groove through the buffer structure, thereby ensuring the impact protection performance of the bottom plate assembly and improving the reliability of the battery device. Since the inner lining plate is on the inner side of the box body, the first buffer structure is on the side of the inner lining plate close to the battery cell. Under the joint limiting action of the battery cell and the inner lining plate, the first buffer structure can be stably maintained in the first sub-groove. Not only that, since the inner lining plate is on the inner side of the box body, the first sub-groove is equivalent to being recessed toward the outside of the box body, which is equivalent to providing a buffer energy absorption space for the battery cell, which can achieve better protection effect.

[0009] In some embodiments, the groove is disposed near an edge of the battery cell.

[0010] Generally speaking, the ability of the middle area of ​​a battery cell to resist impact deformation is weaker than that of its edge area. In the above technical solution, the groove of the plate is set close to the edge of the battery cell, that is, the middle part of the battery cell is set to the interval area with stronger impact resistance between the two layers of plate bodies, which is beneficial to balancing the impact resistance of various local areas between the battery cell and the bottom plate assembly.

[0011] In some embodiments, the two layers of the plate bodies are respectively formed with the grooves, and a buffer structure is provided in each of the grooves;

[0012] The two layers of the plate bodies are adhered and connected at the positions where the grooves are located.

[0013] In the above technical solution, grooves are formed on the two layers of plate bodies respectively, and by bonding and connecting at the positions of the grooves, at least the degree of depression of the grooves on a single plate body can be reduced, thereby reducing the difficulty of processing the plate body; not only that, since both layers of plate bodies have grooves, it is beneficial to improve the rigidity and modality of the base plate assembly in the extended plane.

[0014] In some embodiments, the two layers of the plate are welded or bonded at the fitting area.

[0015] Compared with the traditional solutions of bolt connection and snap connection, in the above technical solution, the two layers of plate are welded or bonded at the position of the fitting area, which makes the connection simpler and more reliable.

[0016] In some embodiments, the first cushioning structure includes cushioning foam.

[0017] In the above technical solution, the buffer foam has good buffering and energy absorption performance, and also has the advantages of low density and good insulation, and is an ideal buffer structure in the battery device.

[0018] In some embodiments, the first buffer structure includes a heat exchange tube, and the heat exchange tube abuts against the battery cell.

[0019] In the above technical solution, the heat exchange tube is a tubular structure, and a flow channel is usually provided inside it for the heat exchange liquid to circulate. Therefore, when the heat exchange tube encounters an impact, it can absorb energy through the collapse of its own flow channel. It can not only exchange heat with the battery cell, but also protect the battery cell from impact.

[0020] In some embodiments, the heat exchange tube is disposed flush with the inner surface of the spacing region of the lining plate.

[0021] In the above technical solution, since the inner surfaces of the spacer area between the heat exchange tube and the inner lining plate are arranged flush, the spacer area between the heat exchange tube and the inner lining plate can simultaneously participate in abutting the battery cell, which is beneficial to improving the support stability for the battery cell and can also reduce the bearing pressure of the heat exchange tube.

[0022] In some embodiments, the two layers of the plate body include an inner lining plate located inside the box body, and the inner lining plate is provided with a heat exchange portion capable of performing heat exchange with the battery cells.

[0023] In the above technical solution, the inner lining plate can support the battery cell and, at the same time, perform heat exchange with the battery cell through its own heat exchange portion to achieve thermal management of the battery cell.

[0024] In some embodiments, the heat exchange portion is disposed corresponding to a middle portion of the battery cell.

[0025] In the above technical solution, since the middle part of the battery cell is the location where heat is generated or heat demand is greater, the heat exchange part is arranged corresponding to the middle part of the battery cell, which can achieve efficient heat exchange with the battery cell; combined with the solution in which the groove is arranged close to the edge of the battery cell, the heat exchange part and the groove are equivalent to being staggered, that is, the heat exchange part corresponds to the spacing area between the two layers of plate bodies. The cavity formed in the spacing area can provide energy absorption protection for the heat exchange part, reducing the probability of the heat exchange part being damaged due to impact.

[0026] In some embodiments, the heat exchange portion is configured as a heating film.

[0027] In the above technical solution, the heat exchange part is set as a heating film. In a cold working environment, the heating film can convert electrical energy into thermal energy, thereby heating the battery cells installed on the inner lining plate, so that the battery cells work in a high-efficiency temperature range and improve the battery life performance of the battery device.

[0028] In some embodiments, the two layers of the plate body include a bottom guard plate located outside the box body, and the groove includes a second sub-groove formed in the bottom guard plate;

[0029] The buffer structure includes a second buffer structure arranged in the second sub-groove, and the second buffer structure is lower than the outer surface of the spacing area of ​​the bottom guard plate.

[0030] In the above technical solution, since the bottom guard plate is on the outside, it is most directly subjected to the impact from the ground. Based on this, the second buffer structure is set to be lower than the outer surface of the spacing area of ​​the bottom guard plate, that is, the second buffer structure is completely hidden in the second sub-groove of the bottom guard plate, which is conducive to impact protection of the second buffer structure through the bottom guard plate and reduces the probability of the second buffer structure falling off due to external scratches.

[0031] In some embodiments, a height difference between the second buffer structure and an outer surface of a spaced area of ​​the bottom guard plate is between 1 mm and 3 mm.

[0032] In the above technical solution, the height difference between the outer surface of the spacing area between the second buffer structure and the bottom guard plate is between 1mm and 3mm. The design is relatively reasonable. On the basis of reducing the probability of the second buffer structure being scratched, the second buffer structure can also take into account sufficient buffering and energy absorption performance.

[0033] In a second aspect, the present application further proposes an electrical device comprising the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 A simplified structural diagram of an embodiment in which the electrical equipment provided in this application is a vehicle;

[0036] Figure 2 A schematic diagram of the exploded structure of an embodiment of the battery device provided in this application;

[0037] Figure 3 A schematic top view of another embodiment of the battery device provided in this application;

[0038] Figure 4 for Figure 3 Structural diagram of the middle section A;

[0039] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the part B in the middle;

[0040] Figure 6 for Figure 3 Schematic diagram of the three-dimensional structure of the middle box and the buffer structure;

[0041] Figure 7 for Figure 6 Schematic diagram of the exploded structure of the middle box and buffer structure.

[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. Fitting area; 13b. Spacing area; 131. Plate body; 131a. Groove; 1311a. First sub-groove; 1312a. Second sub-groove; 1311. Liner plate; 1312. Bottom guard plate; 2. Battery cell; 21. Middle portion of battery cell; 22. Edge of battery cell; 3. Buffer structure; 31. First buffer structure; 32. Second buffer structure; 4. Heat exchange unit; 4a. Heating film;

[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 indicate the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise 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 2This 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. The periphery of each plate is connected to the box frame by bolts, and the larger area in the middle is usually in a suspended state spaced apart from each other. In order to improve the stiffness and mode of the bottom plate assembly, a more common solution is to add a connection structure to the larger suspended area in the middle, such as adding a bolt connection structure or a snap connection structure between two adjacent plates. However, the setting of these connection structures will compress the buffer space between the plates, resulting in the impact protection performance of the bottom plate assembly at the position where the connection structure is located being weakened.

[0065] Analysis shows that the setting of the connection structure is difficult to avoid for the compression of the buffer space. It is possible to consider reducing the connection thickness of the connection structure and combining an external buffer structure to compensate for the compression of the buffer space. In view of this, the present application provides a battery device. Applying the battery device provided by the present application to a vehicle can at least improve the problem of insufficient impact protection performance of the bottom plate 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 A schematic top view of another embodiment of the battery device provided in this application; Figure 4 for Figure 3 Structural diagram of the middle section A; Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the part B in the middle; Figure 6 for Figure 3 Schematic diagram of the three-dimensional structure of the middle box and the buffer structure; Figure 7 for Figure 6 Schematic diagram of the exploded structure of the middle box and buffer structure.

[0067] See also Figures 3 to 5 In one embodiment of the present application, the battery device 100 includes a box body 1, a battery cell 2 and a buffer structure 3. The box body 1 has a bottom plate assembly 13. The bottom plate assembly 13 includes at least two layers of plates 131 stacked along its thickness direction X. The two layers of plates 131 have spaced-apart spacing areas 13b and bonding areas 13a bonded and connected to each other. At a position corresponding to the bonding area 13a, at least one plate 131 has a groove 131a that is recessed toward the other plate 131; the buffer structure 3 is disposed in the groove 131a; the battery cell 2 is disposed in the box body 1 and mounted 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 at least two layers of plates 131 stacked along its thickness direction X. Of course, it may also be a three-layer plate body 131. The at least two layers of plates 131 can generally be understood as a combination of an inner lining plate 1311 and a bottom guard plate 1312. For the solution in which the box body 11 includes a frame, the inner lining plate 1311 can be directly connected to the frame, and the bottom guard plate 1312 can be indirectly connected to the frame through the inner lining plate 1311, or the bottom guard plate 1312 can be directly connected to the frame, and the inner lining plate 1311 can be indirectly connected to the frame through the bottom guard plate 1312. 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 covering connection direction of the box cover 12 and the box body 11.

[0069] Generally speaking, in order to ensure the impact protection performance of the bottom plate assembly 13, there is generally a larger area of ​​spacing area 13b between the two layers of plate bodies 131. In the spacing area 13b, a cavity is formed between the two plates 131, and the cavity is also a buffering energy absorption space. In order to alleviate the problem of insufficient rigidity of the bottom plate assembly 13, the two layers of plate bodies 131 of the embodiment of the present application also have a certain area of ​​fitting area 13a between them. The two layers of plate bodies 131 are connected at the fitting area 13a to ensure the rigidity of the bottom plate assembly 13; "at the position corresponding to the fitting area 13a, at least one plate body 131 has a groove 131a recessed toward the other plate body 131" can be understood as, only one plate body 131 is recessed toward the other plate body 131 at the fitting area 13a to form a groove 131a, which can also be understood The two plates 131 are respectively recessed toward each other at the fitting area 13a to form grooves 131a. The grooves 131a of the two plates 131 can overlap or be staggered in the projection of the thickness direction X, and this embodiment does not limit this. It is worth mentioning that the "groove 131a" is formed by one of the plates 131 being recessed toward the other plate 131 at the position corresponding to the fitting area 13a. It can be understood that the plate 131 presents a groove 131a on the side away from the other plate 131 and a bulge on the side facing the other plate 131. The two layers of plates 131 are fitted and connected through the bulge. "The buffer structure 3 is arranged in the groove 131a" can be understood as the buffer structure 3 can be completely in the groove 131a or partially in the groove 131a.

[0070] "The battery cell 2 is installed on the bottom plate assembly 13" means that the bottom plate assembly 13 supports the battery cell 2. Since the bottom plate assembly 13 may include more than two layers of plate bodies 131, the battery cell 2 may be in direct contact or indirect contact with the plate body 131 formed with the groove 131a. For example, a heat exchange plate is also provided on the inner side of the two layers of plate bodies 131, and the battery cell 2 is installed on the heat exchange plate.

[0071] In the technical solution provided by the present application, the bottom plate assembly 13 is used to install the battery cell 2. The two layers of plate bodies 131 in the bottom plate assembly 13 have a spacing area 13b and a fitting area 13a. Corresponding to the fitting area 13a, at least one of the plate bodies 131 has a groove 131a that is recessed toward the other plate body 131, so that the two layers of plate bodies 131 can be fitted and connected at the position where the groove 131a is located. Similarly, based on the recessed setting of the groove 131a toward the other plate body 131, the fitting area 13a can be set directly below the battery cell 2, that is, the two layers of plate bodies 1 31 is positioned at a position with lower stiffness and mode to reduce the degree of deformation of the bottom plate assembly 13 when the battery device 100 is subjected to vibration impact. On this basis, the two layers of plate bodies 131 are spaced apart from each other in the spacing area 13b, and the cavity formed therebetween has a good buffering and energy-absorbing effect. Not only that, the present technical solution also uses the groove 131a of the plate body 131 to set a buffer structure 3, and the buffer structure 3 can enhance the buffering and energy-absorbing effect at the groove 131a, thereby ensuring the impact protection performance of the bottom plate assembly 13 and improving the reliability of the battery device 100.

[0072] See also Figure 4 and Figure 5 In some embodiments, the groove 131 a is disposed near the edge 22 of the battery cell.

[0073] "The groove 131a is arranged near the edge 22 of the battery cell" means that, in the projection in the thickness direction X, the groove 131a is arranged near the edge 22 of the battery cell. The outer shell of the battery cell 2 is usually composed of a shell and a bottom end cover. The projection of the battery cell 2 in the thickness direction X is generally in the shape of the bottom end cover, and the edge of the bottom end cover is also the projection area of ​​the shell. The impact resistance of the bottom end cover of the battery cell 2 is undoubtedly stronger near the projection area (that is, the edge area of ​​the bottom end cover), and is undoubtedly poorer away from the projection area (that is, the middle area of ​​the bottom end cover).

[0074] In the above technical solution, the groove 131a of the plate body 131 is set close to the edge 22 of the battery cell, that is, the middle part 21 of the battery cell is set corresponding to the spacing area 13b with strong impact resistance between the two layers of the plate body 131, which is beneficial to balance the impact resistance of each local area between the battery cell 2 and the bottom plate assembly 13.

[0075] See also Figure 5 In some embodiments, the two layers of plate bodies 131 are respectively formed with grooves 131 a , and a buffer structure 3 is provided in each groove 131 a ; the two layers of plate bodies 131 are attached and connected at the positions where the grooves 131 a are located.

[0076] “The two layers of plate bodies 131 are bonded and connected at the groove 131 a ” means that the grooves 131 a of the two layers of plate bodies 131 overlap in the projection of the thickness direction X, and the convexity formed between the two plates 131 is bonded and connected by utilizing the depression of the groove 131 a .

[0077] In the above technical solution, grooves 131a are respectively formed on the two layers of plate bodies 131, and the positions of the grooves 131a are adhered and connected, which can at least reduce the degree of depression of the grooves 131a on a single plate body 131, thereby reducing the processing difficulty of the plate body 131; not only that, since both layers of plate bodies 131 have grooves 131a, it is beneficial to improve the rigidity and modality of the bottom plate assembly 13 in the extended plane.

[0078] In some embodiments, the two layers of plate 131 are welded or bonded at the joining area 13a.

[0079] The method of “welding the two-layer plate body 131 at the bonding area 13a” can refer to the brazing process of the two-layer plate structure in the stamped heat exchange plate in the battery field, and this embodiment does not limit this.

[0080] Compared with the traditional solutions of screw connection and snap connection, in the above technical solution, the two layers of plate 131 are directly welded or bonded at the fitting area 13a, which makes the connection simpler and more reliable, and there is no additional connection structure. The buffer structure 3 can be fully arranged in the groove 131a of the fitting area 13a.

[0081] See also Figure 4 and Figure 5 In some embodiments, the two-layer plate body 131 includes an inner lining plate 1311 located on the inner side of the box body 1, the groove 131a includes a first sub-groove 1311a arranged in the inner lining plate 1311; the buffer structure 3 includes a first buffer structure 31 arranged in the first sub-groove 1311a.

[0082] It should be noted that the inner side of the box body 1 refers to the side close to the battery cell 2, and the inner lining plate 1311 is located on the inner side of the box body 1 and is the plate body 131 closest to the battery cell 2. In some embodiments, the inner lining plate 1311 may also be a heat exchange plate; for ease of distinction, this embodiment defines the groove 131a provided on the inner lining plate 1311 as the first sub-groove 1311a, and at the same time defines the buffer structure 3 provided in the first sub-groove 1311a as the first buffer structure 31.

[0083] In the above technical solution, since the inner lining plate 1311 is located on the inner side of the box body 1, the first buffer structure 31 is located on the side of the inner lining plate 1311 close to the battery cell 2. Under the joint limiting action of the battery cell 2 and the inner lining plate 1311, the first buffer structure 31 can be stably maintained in the first sub-recess 1311a. Moreover, since the inner lining plate 1311 is located on the inner side of the box body 1, the first sub-recess 1311a is equivalent to being recessed toward the outer side of the box body 1, providing a buffering energy absorption space for the battery cell 2, which can provide better protection.

[0084] In some embodiments, the first cushioning structure 31 includes cushioning foam.

[0085] There are many materials for the buffer foam, such as polyethylene, polyurethane, polyvinyl chloride, etc. The buffer foam generally has good impact resistance, low density, and good insulation properties, and is an ideal buffer structure 3 in the battery device 100 .

[0086] In some embodiments, the first buffer structure 31 includes a heat exchange tube, which abuts against the battery cell 2 .

[0087] The reason why the buffer structure 3 has buffering performance is generally because its structure itself has a cavity that can be compressed to absorb energy. Therefore, the choice of the first buffer structure 31 is not limited to structures such as buffer foam. In this embodiment, the first buffer structure 31 includes a heat exchange tube. The heat exchange tube is a tubular structure, and a flow channel is usually provided inside it for the circulation of heat exchange liquid. Therefore, when the heat exchange tube encounters an impact, it can absorb energy through the collapse of its own flow channel. It can not only exchange heat with the battery cell 2, but also provide impact protection for the battery cell 2.

[0088] In some embodiments, the heat exchange tube is flush with the inner surface of the spacing region 13 b of the lining plate 1311 .

[0089] It should be noted that the spacing area 13b and the fitting area 13a of the two-layer plate body 131 are usually adjacent to each other, and the groove 131a is formed in the fitting area 13a. Based on this, the "inner surface of the spacing area 13b of the inner lining plate 1311" refers to the surface of the peripheral area on the inner lining plate 1311 that is adjacent to the first sub-groove 1311a, and "the heat exchange tube is flush with the inner surface of the spacing area 13b of the inner lining plate 1311" means that the end face of the heat exchange tube for heat exchange with the battery cell 2 is in the same plane as the inner surface of the peripheral area of ​​the first sub-groove 1311a.

[0090] In the above technical solution, since the heat exchange tube is flush with the inner surface of the spacing area 13b of the inner lining plate 1311, the heat exchange tube and the inner surface of the spacing area 13b of the inner lining plate 1311 can simultaneously participate in abutting the battery cell 2, which is beneficial to improving the support stability for the battery cell 2, and at the same time can reduce the bearing pressure of the heat exchange tube.

[0091] See also Figure 6 In some embodiments, the two-layer plate body 131 includes an inner lining plate 1311 located on the inner side of the box body 1 , and the inner lining plate 1311 is provided with a heat exchange portion 4 capable of performing heat exchange with the battery cell 2 .

[0092] It should be noted that the heat exchange part 4 can be a part of the inner lining plate 1311 body. For example, when the inner lining plate 1311 is a heat exchange plate, the heat exchange part 4 can be a heat exchange channel in the heat exchange plate. The heat exchange part 4 can also be an external structure on the inner lining plate 1311. The heat exchange part 4 can perform heat exchange with the battery cell 2, including heating the battery cell 2 and cooling the battery cell 2. This embodiment does not limit the specific structural form of the heat exchange part 4.

[0093] In the above technical solution, the inner lining plate 1311 can support the battery cell 2 and, at the same time, perform heat exchange with the battery cell 2 through the heat exchange portion 4 provided therein, so as to achieve thermal management of the battery cell 2 .

[0094] In some embodiments, the heat exchange portion 4 is disposed corresponding to the middle portion 21 of the battery cell.

[0095] As mentioned above, the battery cell 2 also includes an electrode assembly arranged in the shell. The electrode assembly is the main component for the electrochemical reaction. The heat generated by the electrode assembly is usually large, and the heat on the inside is less likely to dissipate than the heat on the outside. The inside of the electrode assembly usually corresponds to the middle position of the bottom end cover of the battery cell 2 in the above-mentioned thickness direction X; "the heat exchange part 4 is arranged corresponding to the middle part 21 of the battery cell" means that, in the projection of the above-mentioned thickness direction X, the heat exchange part 4 is arranged corresponding to the middle part 21 of the battery cell.

[0096] In the above technical solution, since the middle part 21 of the battery cell is a position where heat is generated or heat demand is relatively large, the heat exchange part 4 is arranged corresponding to the middle part 21 of the battery cell, which can perform efficient heat exchange with the battery cell 2; combined with the solution in which the groove 131a is arranged close to the edge 22 of the battery cell, the heat exchange part 4 and the groove 131a are equivalent to being staggered, that is, the heat exchange part 4 corresponds to the spacing area 13b between the two layers of plate bodies 131. The cavity formed in the spacing area 13b can provide energy absorption protection for the heat exchange part 4, thereby reducing the probability of the heat exchange part 4 being damaged due to impact.

[0097] See also Figure 6In some embodiments, the heat exchange portion 4 is configured as a heating film 4a.

[0098] The "heating film 4a" is a key component used to actively regulate the temperature of the battery cell 2. Especially in low-temperature environments, the heating film 4a can improve the performance of the battery cell 2, extend its life and ensure reliability through precise heating.

[0099] In the above technical solution, the heat exchange part 4 is set as a heating film 4a. In a cold working environment, the heating film 4a can convert electrical energy into thermal energy, thereby heating the battery cell 2 installed on the inner lining plate 1311, so that the battery cell 2 operates in a high-efficiency temperature range, thereby improving the battery life performance of the battery device 100.

[0100] See also Figure 5 In some embodiments, the two-layer plate body 131 includes a bottom guard plate 1312 located on the outside of the box body 1, and the groove 131a includes a second sub-groove 1312a formed in the bottom guard plate 1312; the buffer structure 3 includes a second buffer structure 32 arranged in the second sub-groove 1312a, and the second buffer structure 32 is lower than the outer surface of the spacing area 13b of the bottom guard plate 1312.

[0101] It should be noted that the outer side of the housing 1 refers to the side away from the battery cells 2. The bottom guard plate 1312 is located on the outer side of the housing 1 and is the part of the plate 131 most directly exposed to external impact. For ease of distinction, this embodiment defines the groove 131a provided in the bottom guard plate 1312 as the second sub-groove 1312a, and the buffer structure 3 provided within the second sub-groove 1312a as the second buffer structure 32. The spacing region 13b and the contact region 13a of the two-layer plate 131 are generally adjacent, and the groove 131a is formed in the contact region 13a. Therefore, the "outer surface of the spacing region 13b of the bottom guard plate 1312" refers to the surface of the adjacent area of ​​the bottom guard plate 1312 and the second sub-groove 1312a. The "second buffer structure 32 is lower than the outer surface of the spacing region 13b of the bottom guard plate 1312" refers to the fact that the dimension of the second buffer structure 32 in the thickness direction X is less than the depth of the second sub-groove 1312a.

[0102] In the above technical solution, since the bottom guard plate 1312 is on the outside, it is most directly subjected to the impact from the ground. Based on this, the second buffer structure 32 is set to be lower than the outer surface of the spacing area 13b of the bottom guard plate 1312, that is, the second buffer structure 32 is completely hidden in the second sub-groove 1312a of the bottom guard plate 1312, which is conducive to impact protection of the second buffer structure 32 through the bottom guard plate 1312, and reduces the probability of the second buffer structure 32 falling off due to external scratches.

[0103] See also Figure 5In some embodiments, a height difference H between the second buffer structure 32 and the outer surface of the spacing area 13 b of the bottom guard plate 1312 is between 1 mm and 3 mm.

[0104] It should be noted that this embodiment limits the height difference H between the outer surface of the spacing area 13b of the second buffer structure 32 and the bottom guard plate 1312 to between 1mm and 3mm. The height difference H can be any value between 1mm and 3mm, such as 1mm, 1.5mm, 2.65mm, and 3mm.

[0105] In the above technical solution, the height difference between the outer surface of the spacing area 13b of the second buffer structure 32 and the bottom guard plate 1312 is between 1mm and 3mm. The design is relatively reasonable. On the basis of reducing the probability of the second buffer structure 32 being scratched, the second buffer structure 32 can also take into account sufficient buffering and energy absorption performance.

[0106] 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.

[0107] The present application proposes a battery device 100, which includes a box body 1, a buffer structure 3 and a battery cell 2. The box body 1 has a bottom plate assembly 13. The battery cell 2 is arranged in the box body 1 and installed on the bottom plate assembly 13. The bottom plate assembly 13 includes two layers of plates 131 stacked along its thickness direction X. The two layers of plates 131 have mutually spaced spacing areas 13b and mutually bonded and connected bonding areas 13a. At the positions corresponding to the bonding areas 13a, the two layers of plates 131 are respectively formed with grooves 131a arranged near the edges 22 of the battery cells. The grooves 131a are recessed toward the other plate body 131. The two layers of plates 131 are welded or bonded at the positions where the grooves 131a are located. The two layers of plates 131 include the inner side of the box body 1. The inner lining plate 1311 and the bottom guard plate 1312 on the outside of the box body 1, the groove 131a on the inner lining plate 1311 is set as the first sub-groove 1311a, and the groove 131a on the bottom guard plate 1312 is set as the second sub-groove 1312a, the first sub-groove 1311a is provided with a first buffer structure 31, and the first buffer structure 31 is flush with the inner surface of the spacing area 13b of the inner lining plate 1311, and jointly supports the battery cell 2, the second sub-groove 1312a is provided with a second buffer structure 32, and the second buffer structure 32 is lower than the outer surface of the spacing area 13b of the bottom guard plate 1312, and the height difference between the two is between 1mm and 3mm, and the middle part 21 of the inner lining plate 1311 corresponding to the battery cell is also provided with a heating film 4a.

[0108] 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 at least two layers of plates stacked along the thickness direction thereof, the two layers of plates having spaced-apart areas and mutually abutted and connected areas, at a position corresponding to the abutted areas, at least one of the plates having a groove recessed toward the other plate body, the two layers of plates including an inner lining plate located on the inner side of the box body, the groove including a first sub-groove provided on the inner lining plate; a buffer structure, disposed in the groove, the buffer structure comprising a first buffer structure disposed in the first sub-groove; as well as, The battery cell is disposed in the box and mounted on the bottom plate assembly.

2. The battery device according to claim 1, wherein: The groove is arranged close to the edge of the battery cell.

3. The battery device according to claim 1, wherein: The two layers of the plate bodies are respectively formed with the grooves, and the buffer structure is arranged in each groove; The two layers of the plate bodies are adhered and connected at the positions where the grooves are located.

4. The battery device according to claim 1, wherein: The two layers of the plate bodies are welded or bonded at the fitting area.

5. The battery device according to claim 1, wherein: The first buffer structure includes buffer foam.

6. The battery device according to claim 1, wherein: The first buffer structure includes a heat exchange tube, and the heat exchange tube abuts against the battery cell.

7. The battery device according to claim 6, wherein: The heat exchange tube is arranged flush with the inner surface of the spacing area of ​​the lining plate.

8. The battery device according to any one of claims 1 to 4, characterized in that: The two layers of the plate body include an inner lining plate located on the inner side of the box body, and the inner lining plate is provided with a heat exchange portion capable of performing heat exchange with the battery cells.

9. The battery device according to claim 8, wherein: The heat exchange portion is arranged corresponding to the middle portion of the battery cell.

10. The battery device according to claim 8, wherein The heat exchange portion is configured as a heating film.

11. The battery device according to any one of claims 1 to 4, characterized in that: The two layers of the plate body include a bottom guard plate located outside the box body, and the groove includes a second sub-groove formed on the bottom guard plate; The buffer structure includes a second buffer structure arranged in the second sub-groove, and the second buffer structure is lower than the outer surface of the spacing area of ​​the bottom guard plate.

12. The battery device according to claim 11, wherein: A height difference between the second buffer structure and the outer surface of the spacing area of ​​the bottom guard plate is between 1 mm and 3 mm.

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

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