Battery device, energy storage device and power utilization device

Abstract

The utility model discloses a battery device, an energy storage device and a power utilization device, the battery device comprises a box body, a plurality of battery monomers and a foaming rubber plate, the box body forms a containing cavity, the box body comprises a bottom plate, the containing cavity is located on one side of the bottom plate along a first direction, and the first direction is parallel to the thickness direction of the bottom plate; the plurality of single batteries are arranged in the accommodating cavity; the foaming rubber plate is arranged on the side, away from the containing cavity in the first direction, of the bottom plate, the foaming rubber plate is connected with the box body, and the foaming rubber plate serves as a bottom protection plate of the box body, so that the weight of the battery device is reduced, and the production cost of the battery device is reduced.

Description

Technical Field

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

[0002] In recent years, battery devices have made great progress. Battery devices can be widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, as well as in electric vehicles, power tools, military equipment, aerospace and other fields.

[0003] How to reduce the weight of battery devices and reduce the production cost of battery devices is an important research direction in the battery field. Utility Model Content

[0004] The embodiments of the present application provide a battery device, an energy storage device, and an electrical device, which can reduce the weight of the battery device and lower the production cost of the battery device.

[0005] In the first aspect, an embodiment of the present application provides a battery device, comprising a box body, a plurality of battery cells and a foam board, the box body forming a accommodating cavity, the box body including a bottom plate, the accommodating cavity being located on one side of the bottom plate along a first direction, the first direction being parallel to the thickness direction of the bottom plate; a plurality of battery cells being arranged in the accommodating cavity; the foam board being arranged on a side of the bottom plate along the first direction away from the accommodating cavity, the foam board being connected to the box body.

[0006] In the above scheme, the box body is formed with a accommodating cavity, and multiple battery cells are arranged in the accommodating cavity. The accommodating cavity is located on one side of the bottom plate of the box body along the first direction, and a foam rubber plate is provided on the side of the bottom plate away from the accommodating cavity along the first direction. Using the foam rubber plate as the bottom protective plate of the box body helps to reduce the weight of the battery device and reduce the production cost of the battery device, while taking into account the energy density and reliability of the battery device.

[0007] In some embodiments, the box body further includes a frame, which is arranged around the circumference of the bottom plate and connected to the bottom plate, and the foam board is connected to the frame.

[0008] In the above solution, the foam board is connected to the frame of the box, which helps to improve the stability and reliability of the foam board and enhance the protective effect of the foam board on the box and structures such as the battery cells inside the box.

[0009] In some embodiments, along the direction of the accommodating cavity pointing to the bottom plate, the frame protrudes from the side of the bottom plate away from the accommodating cavity; the frame and the bottom plate are combined to form a accommodating groove, the accommodating groove and the accommodating cavity are respectively located on both sides of the bottom plate, and at least part of the foam board is located in the accommodating groove.

[0010] In the above scheme, the frame protrudes from the side of the bottom plate away from the accommodating cavity in the direction of the accommodating cavity with respect to the bottom plate, and thus the part of the frame protruding away from the accommodating cavity with respect to the bottom plate can form an accommodating groove together with the bottom plate. The accommodating groove is located on the side of the bottom plate away from the accommodating cavity, and at least part of the foamed glue plate is arranged in the accommodating groove, which helps to further improve the stability and reliability of the foamed glue plate.

[0011] In some embodiments, the frame is provided with a through hole, and the through hole is communicated with the accommodating groove.

[0012] In the above scheme, during the production of the battery device, the through hole can be used as a glue injection hole to inject foamed glue into the accommodating groove, so as to form a foamed glue plate in the accommodating groove.

[0013] In some embodiments, the number of through holes is multiple, and part of the multiple through holes is used for glue injection, and part of the multiple through holes is used for air exhaust.

[0014] In the above scheme, while injecting glue into the accommodating groove through one or more through holes, the one or more through holes are used to exhaust air in the accommodating groove during the glue injection process, which helps to smoothly inject glue into the accommodating groove and reduces the risk of affecting the glue injection effect due to the increase in air pressure in the accommodating groove after being blocked by the pressing plate during the glue injection process.

[0015] In some embodiments, part of the foamed glue plate is accommodated in the through hole.

[0016] In the above scheme, when the through hole is used to inject foamed glue into the accommodating groove, part of the foamed glue plate formed after the foamed glue expands can be located in the through hole. This part of the foamed glue plate can be in contact with and connected to the inner wall of the through hole in the through hole, thereby helping to increase the connection area of the foamed glue plate and the frame and improve the reliability of the connection between the foamed glue plate and the frame. Moreover, when part of the foamed glue plate is located in the through hole, the inner wall of the through hole can also limit the foamed glue plate to improve the stability of the foamed glue plate.

[0017] In some embodiments, the outer periphery of the foamed glue plate is bonded to the frame.

[0018] In the above scheme, the foamed glue plate is arranged in the accommodating groove formed by the frame and the bottom plate, and the outer periphery of the foamed glue plate is connected to the frame, thereby helping to further improve the reliability of the connection between the foamed glue plate and the frame. Moreover, since the foamed glue itself has adhesion, during the preparation of the foamed glue plate, the foamed glue injected into the accommodating groove can be automatically bonded to the frame after foaming and expansion, without the need to add additional processes for connecting the foamed glue plate and the frame, thereby helping to simplify the production process of the battery device, improve the production efficiency of the battery device, and further reduce the production cost of the battery device.

[0019] In some embodiments, in the first direction, the distance between the end of the frame protruding away from the side of the bottom plate facing away from the accommodation cavity and the bottom plate is H1, and the distance between the side surface of the foamed glue plate facing away from the bottom plate and the bottom plate is H2, H1≥H2.

[0020] In the above scheme, the side of the foamed glue plate facing away from the bottom plate can be flush with the end of the frame protruding away from the side of the bottom plate facing away from the accommodation cavity, or recessed relative to the end of the frame, thereby reducing the risk of interference between the foamed glue plate and other structures around the battery device.

[0021] In some embodiments, the foamed glue plate is bonded to the bottom plate.

[0022] In the above scheme, the foamed glue plate is bonded to the bottom plate, which can further improve the stability and reliability of the foamed glue plate. Moreover, since the foamed glue itself has adhesion, the foamed glue injected into the accommodation groove can be automatically bonded to the bottom plate after foaming and expansion during the preparation process of the foamed glue plate, without the need to add additional processes for connecting the foamed glue plate and the bottom plate, which helps to further simplify the production process of the battery device, improve the production efficiency of the battery device, and further reduce the production cost of the battery device.

[0023] In some embodiments, the battery device further comprises a heat exchange plate, and in the first direction, the heat exchange plate is arranged between the bottom plate and the foamed glue plate.

[0024] In the above scheme, in the first direction, the heat exchange plate is arranged between the bottom plate and the foamed glue plate, thereby facilitating heat exchange between the heat exchange plate and the battery cells in the accommodation cavity and reducing the risk of thermal failure of the battery cells.

[0025] In some embodiments, the number of heat exchange plates is multiple, and the multiple heat exchange plates are arranged at intervals along a second direction perpendicular to the first direction.

[0026] In the above scheme, the multiple heat exchange plates arranged at intervals along the second direction can be collectively used for heat exchange with the battery cells, which helps to further reduce the risk of thermal failure of the battery cells.

[0027] In some embodiments, a part of the foamed glue plate is bonded to the heat exchange plate, and another part is bonded to the bottom plate in the gap between adjacent two heat exchange plates.

[0028] In the above scheme, when the foamed glue is injected into the accommodation groove, a part of the foamed glue can be located in the area corresponding to the heat exchange plate, and another part can be located in the area corresponding to the gap between adjacent two heat exchange plates. After foaming and expansion, a part of the foamed glue plate formed can be bonded to the side surface of the heat exchange plate facing away from the bottom plate, and another part can be located in the gap and bonded to the side of the heat exchange plate facing the gap and the bottom plate exposed via the gap, which helps to further improve the reliability of the connection between the foamed glue plate and the box and improve the stability of the foamed glue plate.

[0029] In some embodiments, the box body also includes a frame, which is arranged around the circumference of the bottom plate and connected to the bottom plate. Along the direction of the accommodating cavity pointing to the bottom plate, the frame protrudes from the side of the bottom plate away from the accommodating cavity; at least one side of the heat exchange plate is connected to the frame.

[0030] In the above scheme, the portion of the frame that protrudes relative to the bottom plate toward the side away from the accommodating cavity can be enclosed with the bottom plate to form an accommodating groove. The accommodating groove is located on the side of the bottom plate away from the accommodating cavity. The heat exchange plate is arranged in the accommodating groove, and the heat exchange plate is connected to the frame along at least one side of its own circumference, which helps to improve the stability and reliability of the heat exchange plate, and further improve the stability and reliability of the foam plate when connected to the heat exchange plate.

[0031] In a second aspect, an embodiment of the present application provides an energy storage device, comprising the above-mentioned battery device.

[0032] In a third aspect, an embodiment of the present application provides an electrical device comprising the above-mentioned battery device.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. 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 these drawings without creative work.

[0035] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application;

[0036] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0037] Figure 3 for Figure 2 A schematic structural diagram of a battery cell assembly is shown;

[0038] Figure 4 A bottom view of a battery device according to some embodiments of the present application;

[0039] Figure 5 is an exploded view of a box and a foam board in a battery device provided in some embodiments of the present application;

[0040] Figure 6 The battery device provided by some embodiments of the present application is Figure 4 Schematic cross-sectional view at AA;

[0041] Figure 7 is another exploded view of the box and the foam board in the battery device provided in some embodiments of the present application;

[0042] Figure 8 The battery device provided in other embodiments of the present application is Figure 4 Schematic cross-sectional view at AA;

[0043] Figure 9 is an exploded view of a box and a foam board in a battery device provided in some other embodiments of the present application;

[0044] Figure 10 The battery device provided by some embodiments of the present application is Figure 4 Schematic cross-sectional view at BB.

[0045] The accompanying figures are as follows:

[0046] Vehicle 1000; battery device 100; controller 200; motor 300;

[0047] Box body 10; first part 101; second part 102; accommodating chamber 11; bottom plate 12; frame 13; through hole 131; accommodating groove 14; battery cell 20; foam board 30; heat exchange plate 40; first direction X; second direction Y. DETAILED DESCRIPTION

[0048] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0050] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0051] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] In the embodiment of the present application, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0053] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited to this.

[0054] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode and a negative electrode. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive and negative electrodes.

[0055] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0056] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0057] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0058] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0059] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0060] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0061] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0062] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0063] In some embodiments, the electrode assembly is a laminate structure.

[0064] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0065] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0066] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0067] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0068] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0069] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0070] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0071] In some embodiments, a battery cell may include an outer shell. This outer shell may be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be sealed or non-sealed. For example, in a non-sealed outer shell, the outer shell protects the electrode assembly and includes a sealing bag between the outer shell and the electrode assembly, which encapsulates the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. In a sealed outer shell, the outer shell encapsulates the electrode assembly, electrolyte, and other components.

[0072] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0073] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0074] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0075] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0076] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0077] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with a cable tie.

[0078] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0079] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0080] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0081] As an example, the box body may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box body for accommodating the battery cell assembly.

[0082] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0083] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0084] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0085] The bottom of a battery device's casing is often equipped with a bottom guard plate to protect the battery bottom and the battery cells inside. Currently, this plate is often made of metal and assembled to the casing using metal fasteners such as bolts. Furthermore, a seal may be provided between the plate and the casing to achieve a seal. These structural features significantly increase the weight and cost of the battery device.

[0086] Based on the above considerations, an embodiment of the present application provides a battery device, including a box body, multiple battery cells and a foam board, the box body is formed with a accommodating cavity, the box body includes a bottom plate, the accommodating cavity is located on one side of the bottom plate along a first direction, and the first direction is parallel to the thickness direction of the bottom plate; multiple battery cells are arranged in the accommodating cavity; the foam board is arranged on the side of the bottom plate along the first direction away from the accommodating cavity, and the foam board is connected to the box body.

[0087] In the above solution, a housing is formed with a housing cavity, and a plurality of battery cells are arranged in the housing cavity. The housing cavity is located on one side of the bottom plate of the housing along the first direction, and a foam board is provided on the side of the bottom plate away from the housing cavity along the first direction. Using the foam board as the bottom protective plate of the housing helps to reduce the weight of the battery device and reduce the production cost of the battery device.

[0088] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0089] Please refer to Figure 1 , Figure 1Schematic diagram of the structure of the vehicle provided for some embodiments of the present application. 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. 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.

[0090] 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 .

[0091] Please refer to Figure 2 , Figure 2 An exploded view of a battery device provided in some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 20. In some embodiments, the housing 10 may include a first portion 101 and a second portion 102, the first portion 101 and the second portion 102 overlapping each other, and the first portion 101 and the second portion 102 jointly defining a housing cavity for accommodating the battery cell 20. The second portion 102 may be a hollow structure with one end open, and the first portion 101 may be a plate-like structure, with the first portion 101 overlapping the open side of the second portion 102, so that the first portion 101 and the second portion 102 jointly define a housing cavity; the first portion 101 and the second portion 102 may also be hollow structures each with one end open, with the open side of the first portion 101 overlapping the open side of the second portion 102. Either the first portion 101 or the second portion 102 may include a bottom plate, and at least one of the first portion 101 and the second portion 102 may include a frame. Of course, the battery box formed by the first part 101 and the second part 102 can be in various shapes, such as a cylinder, a cuboid, etc.

[0092] Figure 3 for Figure 2The battery cell assembly is shown as a schematic diagram. In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 that are first connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single assembly and housed within the housing 10.

[0093] Each battery cell 20 may be a secondary battery cell or a primary battery cell; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0094] like Figures 4-6 As shown, in the first aspect, an embodiment of the present application provides a battery device 100, including a box body 10, a plurality of battery cells 20 and a foam board 30, the box body 10 is formed with a accommodating cavity 11, the box body 10 includes a bottom plate 12, the accommodating cavity 11 is located on one side of the bottom plate 12 along a first direction X, and the first direction X is parallel to the thickness direction of the bottom plate 12; the plurality of battery cells 20 are arranged in the accommodating cavity 11; the foam board 30 is arranged on a side of the bottom plate 12 along the first direction X away from the accommodating cavity 11, and the foam board 30 is connected to the box body 10.

[0095] Exemplarily, the box body 10 may include a bottom plate 12, a frame 13 and a top cover. The frame 13 may be arranged around the circumference of the bottom plate 12, and an opening may be formed at the end thereof away from the bottom plate 12. The top cover may be arranged at the end of the frame 13 away from the bottom plate 12 and cover the opening. At this time, the bottom plate 12, the frame 13 and the top cover may be combined to form a relatively closed accommodating cavity 11. The accommodating cavity 11 is located on one side of the bottom plate 12 along the first direction X, and can be used to accommodate structures such as battery cells 20.

[0096] The foam rubber plate 30 refers to a protective plate structure used to protect the bottom of the box body 10. The foam rubber plate 30 is arranged on a side of the bottom plate 12 away from the accommodating cavity 11 along the first direction X, that is, the foam rubber plate 30 and the accommodating cavity 11 are located on opposite sides of the bottom plate 12 in the first direction X. There are many ways to connect the foam rubber plate 30 to the box body 10. For example, the foam rubber plate 30 can be connected to the bottom plate 12 of the box body 10, or the foam rubber plate 30 can be connected to the frame 13 of the box body 10, or the foam rubber plate 30 can be connected to both the bottom plate 12 and the frame 13 of the box body 10. In addition, the foam rubber plate 30 and the box body 10 can be connected by various methods such as bonding and bolting.

[0097] The foam sheet 30 is made of foamed plastic, which solidifies after foaming and expanding to form the foamed plastic sheet 30. The foamed plastic sheet 30 is lightweight and inexpensive. While providing some protection for the housing 10 and the battery cells 20 within it, it effectively reduces the weight of the battery assembly 100 and lowers the production cost of the battery assembly 100.

[0098] Furthermore, the foam has good elasticity. When the battery device 100 is subjected to external impact, the foam sheet 30 can undergo elastic deformation to absorb the impact force, thereby reducing the force transmitted to the bottom plate 12, reducing the risk of deformation and loss of the bottom plate 12, and improving the reliability of the battery device 100.

[0099] In addition, by using the foam board 30 made of foam as the bottom protective plate, when the weight of the battery device 100 is constant, battery cells 20 with larger capacity or more number can be arranged in the box 10, which helps to improve the energy density of the battery device 100.

[0100] It should be noted that there are various ways to prepare the foam sheet 30 in the embodiments of the present application. For example, the foam sheet 30 can be directly placed on the side of the bottom plate 12 away from the accommodating cavity 11, and then formed into the foam sheet 30 after foaming and expansion; alternatively, the foam sheet 30 can be formed first and then installed on the side of the bottom plate 12 away from the accommodating cavity 11.

[0101] Please continue reading Figure 5 and Figure 6 In some embodiments, the box body 10 further includes a frame 13 , which is arranged around the circumference of the bottom plate 12 and connected to the bottom plate 12 , and the foam board 30 is connected to the frame 13 .

[0102] A portion of the foam sheet 30 may be located on one side of the frame 13 along the first direction X, and the surface of the foam sheet 30 adjacent to the accommodating cavity 11 along the first direction X may be connected to the frame 13. Alternatively, the foam sheet 30 may be located on a side of the frame 13 in a direction parallel to the plane of the bottom plate 12, with the side surface of the foam sheet 30 along its own circumferential direction connected to the side surface of the frame 13. There are various ways to connect the frame 13 and the foam sheet 30. For example, the foam sheet 30 may be connected to the frame 13 by bonding, or the foam sheet 30 may be connected to the frame 13 by other means such as bolting.

[0103] In the above solution, the foam board 30 is connected to the frame 13 of the box body 10, which helps to improve the stability and reliability of the foam board 30 and enhance the protective effect of the foam board 30 on the box body 10 and the battery cells 20 and other structures inside the box body 10.

[0104] Please continue reading Figure 5 andFigure 6 In some embodiments, along the direction of the accommodating cavity 11 pointing to the bottom plate 12, the frame 13 protrudes from the side of the bottom plate 12 away from the accommodating cavity 11; the frame 13 and the bottom plate 12 are enclosed to form a accommodating groove 14, and the accommodating groove 14 and the accommodating cavity 11 are respectively located on both sides of the bottom plate 12, and at least a portion of the foam board 30 is located in the accommodating groove 14.

[0105] At least a portion of the foam rubber sheet 30 is located in the receiving groove 14, which may mean that the entire foam rubber sheet 30 is located in the receiving groove 14. Alternatively, it may mean that a portion of the foam rubber sheet 30 is located in the receiving groove 14, while another portion is located outside the receiving groove 14. During the preparation of the battery device 100, foam rubber may be injected into the receiving groove 14, and after the foam rubber foams and expands, the foam rubber sheet 30 is formed in the receiving groove 14.

[0106] Optionally, during the preparation of the battery device 100 , a pressing plate may be used to seal the opening of the receiving groove 14 , and the foam rubber in the receiving groove 14 may be pressurized and oriented to shape the foam rubber, thereby forming a foam rubber sheet 30 having a specific shape and relatively uniform foaming density.

[0107] In the above scheme, along the direction of the accommodating cavity 11 pointing to the bottom plate 12, the frame 13 protrudes from the side of the bottom plate 12 away from the accommodating cavity 11. Therefore, the part of the frame 13 protruding relative to the bottom plate 12 toward the side away from the accommodating cavity 11 can be enclosed with the bottom plate 12 to form a accommodating groove 14. The accommodating groove 14 is located on the side of the bottom plate 12 away from the accommodating cavity 11. Disposing at least a portion of the foam board 30 in the accommodating groove 14 helps to further improve the stability and reliability of the foam board 30.

[0108] See also Figure 7 In some embodiments, the frame 13 is provided with a through hole 131 , and the through hole 131 is connected to the receiving groove 14 .

[0109] The portion of the frame 13 that protrudes from the side of the bottom plate 12 away from the accommodating cavity 11 may be provided with a through hole 131. The through hole 131 may extend along the length direction or width direction of the bottom plate 12, or may extend along other directions. One end of the through hole 131 is connected to the accommodating groove 14, and the other end is connected to the outer surface of the frame 13 facing away from the accommodating groove 14. The number of through holes 131 may be one or more. Multiple through holes 131 may be set on one side of the frame 13, or on multiple sides of the frame 13. The through holes 131 have various shapes. For example, the through hole 131 may be a round hole or a square hole.

[0110] In the above solution, during the production process of the battery device 100 , the through hole 131 can be used as a glue injection hole for injecting foam glue into the receiving groove 14 to form the foam glue plate 30 in the receiving groove 14 .

[0111] In the embodiment of the present application, during the preparation of the battery device 100, a pressing plate can be first used to seal the opening of the receiving groove 14. Then, a foam glue can be injected into the receiving groove 14 through the through hole 131. After the foam glue solidifies in the receiving groove 14 to form the foam glue sheet 30, the pressing plate can be withdrawn. Optionally, after the pressing plate is withdrawn, the foam glue sheet 30 can be further trimmed.

[0112] In some embodiments, there are multiple through holes 131 , a portion of the multiple through holes 131 is used for glue injection, and a portion of the multiple through holes 131 is used for exhaust.

[0113] In the above scheme, while using one or more through holes 131 to inject glue into the receiving groove 14, one or more through holes 131 are also used to discharge the air in the receiving groove 14 during the glue injection process, which helps to smoothly inject glue into the receiving groove 14 and reduces the risk of affecting the glue injection effect due to increased air pressure during the glue injection process in the receiving groove 14 after being blocked by the pressure plate.

[0114] See also Figure 8 In some embodiments, a portion of the foam board 30 is accommodated in the through hole 131 .

[0115] When a portion of the foam rubber sheet 30 is accommodated in the through hole 131 , the foam rubber sheet 30 may completely fill the through hole 131 , or the foam rubber sheet 30 may partially fill the through hole 131 .

[0116] In the above solution, when the foam is injected into the receiving groove 14 using the through hole 131, a portion of the foam sheet 30 formed after the foam expands can be located in the through hole 131. This portion of the foam sheet 30 can contact and connect with the inner wall of the through hole 131 in the through hole 131, thereby helping to increase the connection area between the foam sheet 30 and the frame 13 and improving the reliability of the connection between the foam sheet 30 and the frame 13. In addition, when a portion of the foam sheet 30 is located in the through hole 131, the inner wall of the through hole 131 can also limit the foam sheet 30, thereby improving the stability of the foam sheet 30.

[0117] In some embodiments, the outer periphery of the foam board 30 is bonded to the frame 13 .

[0118] In the above solution, the foam rubber sheet 30 is disposed in the receiving groove 14 formed by the frame 13 and the bottom plate 12, and the outer peripheral side of the foam rubber is connected to the frame 13, thereby helping to further improve the reliability of the connection between the foam rubber sheet 30 and the frame 13. In addition, because the foam rubber itself is sticky, during the preparation process of the foam rubber sheet 30, the foam rubber injected into the receiving groove 14 can automatically adhere to the frame 13 after foaming and expansion, without the need for additional processes for connecting the foam rubber sheet 30 and the frame 13. This helps to simplify the production process of the battery device 100, improve the production efficiency of the battery device 100, and further reduce the production cost of the battery device 100.

[0119] Please continue reading Figure 6 In some embodiments, in the first direction X, the distance between the end of the frame 13 protruding toward the side of the bottom plate 12 away from the accommodating cavity 11 and the bottom plate 12 is H1, and the distance between the surface of the foam board 30 away from the bottom plate 12 and the bottom plate 12 is H2, where H1 ≥ H2. That is, the end of the frame 13 protruding toward the side of the bottom plate 12 away from the accommodating cavity 11 can be aligned with the surface of the foam board 30 away from the bottom plate 12; alternatively, along the direction from the accommodating cavity 11 to the bottom plate 12, the frame 13 can protrude beyond the surface of the foam board 30 away from the bottom plate 12.

[0120] In the above scheme, the side of the foam board 30 away from the bottom plate 12 can be flush with the end of the frame 13 that protrudes toward the side of the bottom plate 12 away from the accommodating cavity 11, or can be recessed relative to the end of the frame 13, thereby reducing the risk of interference between the foam board 30 and other structures around the battery device 100.

[0121] In some embodiments, the foam board 30 is bonded to the bottom board 12 .

[0122] In the above solution, the foam rubber sheet 30 is bonded to the bottom plate 12, which can further improve the stability and reliability of the foam rubber sheet 30. Moreover, since the foam rubber itself is sticky, during the preparation process of the foam rubber sheet 30, the foam rubber injected into the receiving groove 14 can automatically bond to the bottom plate 12 after foaming and expansion, without the need for additional processes for connecting the foam rubber sheet 30 and the bottom plate 12, which helps to further simplify the production process of the battery device 100, improve the production efficiency of the battery device 100, and further reduce the production cost of the battery device 100.

[0123] See also Figure 9 In some embodiments, the battery device 100 further includes a heat exchange plate 40 . In the first direction X, the heat exchange plate 40 is disposed between the bottom plate 12 and the foam plate 30 .

[0124] The heat exchange plate 40 is used to exchange heat with the battery cells 20 to regulate the internal temperature of the battery device 100. The heat exchange plate 40 may be a water-cooled plate, which uses cooling water as the heat exchange medium to exchange heat with the battery cells 20. Alternatively, the heat exchange plate 40 may also use other heat exchange media for heat exchange.

[0125] The heat exchange plate 40 can be connected to the bottom plate 12, the frame 13, or both. The foam plate 30 can be connected only to the heat exchange plate 40 and indirectly connected to the housing 10 via the heat exchange plate 40. Alternatively, the foam plate 30 can be directly connected to both the heat exchange plate 40 and the housing 10. The number of heat exchange plates 40 can be one or more, and multiple heat exchange plates 40 can be arranged adjacent to each other or indirectly.

[0126] In the above solution, in the first direction X, the heat exchange plate 40 is arranged between the bottom plate 12 and the foam plate 30, which is conducive to heat exchange between the heat exchange plate 40 and each battery cell 20 in the accommodating cavity 11, reducing the risk of thermal failure of the battery cell 20.

[0127] Please continue reading Figure 9 In some embodiments, there are multiple heat exchange plates 40 , and the multiple heat exchange plates 40 are arranged at intervals along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0128] The second direction Y can be any direction parallel to the plane of the bottom plate 12. For example, the second direction Y can be the length direction of the bottom plate 12, or the width direction of the bottom plate 12. Alternatively, the second direction Y can be another direction that intersects both the length direction and the width direction of the bottom plate 12. The number of heat exchange plates 40 can be flexibly set according to actual conditions. For example, three heat exchange plates 40 can be provided, and the three heat exchange plates 40 are arranged at intervals along the second direction Y.

[0129] In the above solution, the plurality of heat exchange plates 40 spaced apart along the second direction Y can be used together to exchange heat with the battery cells 20 , which helps to further reduce the risk of thermal failure of the battery cells 20 .

[0130] See also Figure 10 In some embodiments, a portion of the foam board 30 is bonded to the heat exchange plate 40 , and another portion is bonded to the bottom plate 12 in the gap between two adjacent heat exchange plates 40 .

[0131] In the above scheme, after the foam glue is injected into the receiving groove 14, a part of the foam glue can be located in the area corresponding to the heat exchange plate 40, and the other part can be located in the area corresponding to the gap between the two adjacent heat exchange plates 40. After foaming and expansion, a part of the formed foam glue plate 30 can be bonded to the surface of the side of the heat exchange plate 40 away from the bottom plate 12, and the other part can be located in the gap, and bonded to the side of the heat exchange plate 40 facing the gap and the bottom plate 12 exposed through the gap, which helps to further improve the reliability of the connection between the foam glue plate 30 and the box body 10 and enhance the stability of the foam glue plate 30.

[0132] In some embodiments, the box body 10 also includes a frame 13, which is arranged around the circumference of the bottom plate 12 and connected to the bottom plate 12. The frame 13 protrudes from the side of the bottom plate 12 away from the accommodating cavity 11 along the direction of the accommodating cavity 11 pointing to the bottom plate 12; at least one side of the heat exchange plate 40 is connected to the frame 13.

[0133] The heat exchange plate 40 is located in the receiving groove 14, and any side of the heat exchange plate 40 close to the frame 13 can be connected to the frame 13. There are many ways to connect the heat exchange plate 40 to the frame 13. For example, the heat exchange plate 40 can be connected to the frame 13 by welding, or by bolting.

[0134] In the above scheme, the portion of the frame 13 that protrudes relative to the bottom plate 12 toward the side away from the accommodating cavity 11 can be enclosed with the bottom plate 12 to form an accommodating groove 14. The accommodating groove 14 is located on the side of the bottom plate 12 away from the accommodating cavity 11. The heat exchange plate 40 is arranged in the accommodating groove 14, and the heat exchange plate 40 is connected to the frame 13 along at least one side of its own circumference, which helps to improve the stability and reliability of the heat exchange plate 40, and thereby improve the stability and reliability of the foam plate 30 when connected to the heat exchange plate 40.

[0135] In a second aspect, an embodiment of the present application provides an energy storage device, comprising the above-mentioned battery device 100 .

[0136] In a third aspect, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery device 100 .

[0137] The present embodiment provides a battery device 100, an energy storage device, and an electrical device. The battery device 100 includes a housing 10, a plurality of battery cells 20, and a foam board 30. The housing 10 defines a receiving cavity 11. The housing 10 includes a bottom plate 12. The receiving cavity 11 is located on one side of the bottom plate 12 along a first direction X, parallel to the thickness of the bottom plate 12. The plurality of battery cells 20 are disposed in the receiving cavity 11. The foam board 30 is disposed on a side of the bottom plate 12 away from the receiving cavity 11 along the first direction X, and the foam board 30 is connected to the housing 10. The housing 10 also includes a frame 13. The frame 13 is disposed around the circumference of the bottom plate 12 and connected to the bottom plate 12. The foam board 30 is connected to the frame 13. Along the direction from the accommodating cavity 11 to the bottom plate 12, the frame 13 protrudes from the side of the bottom plate 12 away from the accommodating cavity 11. The frame 13 and the bottom plate 12 enclose a accommodating groove 14. The accommodating groove 14 and the accommodating cavity 11 are respectively located on both sides of the bottom plate 12, and at least a portion of the foam rubber plate 30 is located in the accommodating groove 14. The frame 13 is provided with a through hole 131, which is connected to the accommodating groove 14. A portion of the foam rubber plate 30 is accommodated in the through hole 131. In the circumferential direction of the foam rubber plate 30, at least one side of the foam rubber plate 30 is bonded to the frame 13. The battery device 100 also includes a heat exchange plate 40. In the first direction X, the heat exchange plate 40 is arranged between the bottom plate 12 and the foam rubber plate 30. There are multiple heat exchange plates 40, and the multiple heat exchange plates 40 are arranged at intervals along the second direction Y, and the second direction Y is perpendicular to the first direction X. A portion of the foam rubber plate 30 is bonded to the heat exchange plate 40 , and another portion is bonded to the bottom plate 12 in the gap between two adjacent heat exchange plates 40 .

[0138] 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 is formed with a receiving cavity, the box body includes a bottom plate, the receiving cavity is located on one side of the bottom plate along a first direction, and the first direction is parallel to the thickness direction of the bottom plate; A plurality of battery cells are disposed in the accommodating cavity; The foam rubber plate is arranged on a side of the bottom plate away from the accommodating cavity along the first direction, and the foam rubber plate is connected to the box body.

2. The battery device according to claim 1, wherein: The box body further comprises a frame, which is arranged around the circumference of the bottom plate and connected to the bottom plate, and the foam rubber plate is connected to the frame.

3. The battery device according to claim 2, characterized in that Along the direction from the accommodating cavity to the bottom plate, the frame protrudes from a side of the bottom plate away from the accommodating cavity; The frame and the bottom plate are combined to form a receiving groove. The receiving groove and the receiving cavity are respectively located on two sides of the bottom plate. At least a portion of the foam board is located in the receiving groove.

4. The battery device according to claim 3, characterized in that The frame is provided with a through hole, and the through hole is communicated with the accommodating groove.

5. The battery device according to claim 4, characterized in that There are multiple through holes, a portion of the multiple through holes is used for glue injection, and a portion of the multiple through holes is used for exhaust.

6. The battery device according to claim 4, characterized in that A portion of the foam rubber plate is accommodated in the through hole.

7. The battery device according to claim 3, characterized in that The outer peripheral side of the foam board is bonded to the frame.

8. The battery device according to claim 3, wherein: In the first direction, the distance between the end of the frame protruding toward the bottom plate away from the accommodating cavity and the bottom plate is H1, and the distance between the surface of the foam board away from the bottom plate and the bottom plate is H2, H1≥H2.

9. The battery device according to any one of claims 1 to 8, characterized in that: The foam rubber plate is bonded to the bottom plate.

10. The battery device according to any one of claims 1 to 8, characterized in that: The battery device further includes a heat exchange plate. In the first direction, the heat exchange plate is disposed between the bottom plate and the foam rubber plate.

11. The battery device according to claim 10, characterized in that There are multiple heat exchange plates, and the multiple heat exchange plates are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction.

12. The battery device according to claim 11, wherein: A portion of the foam rubber plate is bonded to the heat exchange plate, and another portion is bonded to the bottom plate in the gap between two adjacent heat exchange plates.

13. The battery device according to claim 10, wherein: The box body further includes a frame, which is arranged around the circumference of the bottom plate and connected to the bottom plate, and points along the direction of the accommodating cavity toward the bottom plate, and the frame protrudes from a side of the bottom plate away from the accommodating cavity; At least one side of the heat exchange plate is connected to the frame.

14. An energy storage device, characterized in that: A battery device comprising any one of claims 1 to 13.

15. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 13.

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